JP6496576B2 - Tissue paper - Google Patents

Description

  The present invention relates to a thin paper used for absorbent articles such as disposable diapers and urine pads.

In absorbent articles such as disposable diapers and urine pads, the odor generated from the excrement usually becomes a problem for the wearer and the surrounding people. Several deodorizing techniques have been proposed so far.
For example, Patent Document 1 describes an absorbent body in which an absorbent core is coated with a fiber sheet containing activated carbon, and further coated with a fiber sheet containing an antibacterial agent. In addition, it is described that a quaternary ammonium salt is used as the antibacterial agent from the viewpoint of antibacterial properties and high safety. Cationic antibacterial agents such as quaternary ammonium salts have a high effect of suppressing the growth of microorganisms that cause the odor of excreta.

Usually, the sheet | seat which coat | covers an absorptive core is given the moderate crepe (crepe-like wrinkle). Thereby, the soft texture and sufficient extensibility when moistened with excretory fluid are imparted to the sheet, and the sheet can be prevented from tearing by following the swelling of the absorbent core due to water absorption. This crepe can be applied by, for example, winding wet paper obtained by a wet papermaking method around the drum surface of a Yankee dryer, drying it and then peeling it off from the dryer with a doctor blade or the like. Usually, the crepe rate is The reel speed can be adjusted by the speed difference between the Yankee dryer peripheral speed and the traveling speed (reel speed) behind the doctor blade, and the reel speed is set slower than the Yankee dryer weekly speed. Moreover, if there is no sticking strength above a certain level, creping cannot be performed normally. The sticking phenomenon is caused by the fact that chemicals such as pulp and paper strength agent, which are components of wet paper, form hydrogen bonds with the metal surface of the drum.
In order to increase this sticking, a creping adhesive may be applied to the dryer surface. For example, Patent Document 2 describes a combination of a polyamine-epihalohydrin resin and poly (vinyl alcohol) as a creping adhesive.

JP 2006-191966 A Special Table 2003-515016

At the time of manufacturing the sheet, a cationic antibacterial agent such as a quaternary ammonium salt shown in Patent Document 1 forms a hydrophobic film at the interface with the wet paper dryer surface, and forms a hydrogen bond between the wet paper and the dryer surface. Works in the direction of inhibition. More specifically, since the hydrophilic group of the cationic antibacterial agent is directed to the pulp side and the hydrophobic group is oriented outward, it is considered that the fiber surface is hydrophobized and hydrogen bonding with the dryer surface is inhibited. This phenomenon is particularly likely to occur when the cationic antibacterial agent is applied from one side of the wet paper. As a result, the adhesion between the wet paper and the dryer is lowered, and a sufficient crepe rate cannot be obtained for the sheet, and the creping process itself cannot be performed. In addition, in the middle of the drying process, the wet paper may peel off from the dryer surface, resulting in poor drying. In addition, there is a possibility that continuous production of sheets may be hindered, for example, the paper sag (reduction in tension) is caused by the amount that cannot be creped, and the paper snakes during running.
On the other hand, in the conventional manufacturing method, it is difficult to obtain a sufficient crepe rate when a cationic antibacterial agent such as a quaternary ammonium salt is contained in the sheet, even if the amount of adhesive applied is simply increased. There was room. Moreover, the increase in the amount of the adhesive rather caused the adhesive residue on the surface of the sheet after peeling off, which could hinder the soft texture due to the crepe. In particular, since the adhesives described in the above two patent documents commonly form a crosslinked structure, they act in the direction of hardening the texture of the thin paper. In addition, the adhesive is considered to cancel the softening effect that the cationic antibacterial agent described above develops by loosening hydrogen bonds between fibers, and further has a low adhesive effect.

This onset Ming, in view of the above problems, with a high extinction Nioino contain a cationic antimicrobial agent, and relates to tissue paper and a manufacturing method thereof and a sufficient elongation property during soft texture and moist .

The present invention provides a thin paper having a base material comprising cellulose fibers and a cationic antibacterial agent of 0.01 g / m ² or more and having a crepe rate of 5% or more and 30% or less.

The present invention also provides:
(I) a step of applying an aqueous coating solution containing a cationic antibacterial agent to wet paper containing cellulose fibers and heat-fusible fibers;
(Ii) applying a creping adhesive to the dryer surface;
(Iii) contacting the wet paper coated with the aqueous coating solution and the dryer surface coated with the creping adhesive to adhere the wet paper to the dryer surface while drying; and (iv) the wet Provided is a method for producing thin paper, which comprises a step of obtaining a thin paper by peeling the fiber sheet from which the paper has been dried from the dryer surface using a doctor blade, and a step of winding the thin paper.

  The thin paper of the present invention contains a cationic antibacterial agent, has a high deodorizing ability, and has a soft texture and sufficient extensibility when wet. Moreover, according to the manufacturing method of this invention, the thin paper provided with said performance can be obtained.

It is a schematic diagram which shows an example of the apparatus used with the manufacturing method of the thin paper of this invention. It is a schematic diagram which shows an example of the preparation apparatus of the aqueous coating liquid used with the manufacturing method of the thin paper of this invention. (A) is a schematic diagram which shows the contact state of the conventional dryer surface and wet paper surface, (B) is a schematic diagram which shows the state immediately before the dryer surface and wet paper surface contact in the manufacturing method of this invention. (C) is a schematic diagram showing a state in which the dryer surface and wet paper surface of (B) are in contact and bonded. It is sectional drawing which shows typically an example of the absorbent article using the thin paper of this invention.

  Each cross-sectional view is schematically shown. When the constituent element is a sheet or the like having a small thickness, it is indicated by a line, and the constituent elements are shown with an interval in order to easily distinguish the constituent elements. Therefore, in practice, the components are in contact or bonded unless otherwise specified.

The thin paper of the present invention (hereinafter also simply referred to as a sheet) contains cellulose fibers and 0.01 g / m ² or more of a cationic antibacterial agent, and has a crepe rate of 5% or more and 30% or less. Thus, the thin paper of the present invention combines the content of the cationic antibacterial agent and the crepe rate, which has been difficult to achieve in the past. As will be described later, this coexistence can be realized even when a cationic antibacterial agent is applied to one side of the wet paper and a film is formed in the manufacturing process. That is, even if the cationic antibacterial agent is unevenly distributed on one side of the thin paper from the opposite side and is contained in the basis weight, the above crepe rate is realized.
The thin paper of the present invention has an excellent deodorizing ability and has a soft texture such as tissue paper and sufficient stretchability when wet.

  As described above, the thin paper of the present invention makes it possible to achieve both the uneven distribution of the cationic antibacterial agent on one side and a high crepe rate, and is preferable as a sheet for absorbent articles. When this thin paper is used for an absorbent article, the proliferation of bacteria on the skin side of the user can be suppressed by using the thin paper so that the surface coated with the cationic antibacterial agent comes to the skin side. Conventionally, in general, a cationic antibacterial agent makes cellulose fibers hydrophobic, so that when used as an absorbent article, the liquid permeability of the sheet is lowered and the absorption of the liquid into the absorbent core is inhibited. . In particular, when the cationic antibacterial agent is uniformly distributed in all layers in the thickness direction, the liquid permeability is remarkably lowered. However, in the thin paper of the present invention, the distribution of the coating amount is unevenly distributed on one side, so that the pulling force of the liquid due to the capillary action of the fiber from the uncoated side works, and the influence of the coating on the liquid permeation is affected. As a result, the liquid permeability can be kept good.

The thin paper of the present invention contains cellulose fibers and has liquid permeability. As long as it has the permeability, the basis weight of the thin paper can be appropriately set according to the application of the application member in the absorbent article. For example, when applying to the core wrap sheet which coat | covers the surface of the absorptive core of an absorber, it is preferable that this thin paper is a thing with comparatively low basic weight from a liquid-permeable viewpoint. The basis weight in this case is 45 g / ^{m 2} or less, preferably 30 g / ^{m 2} or less, 20 g / ^{m 2} or less is more preferable. In addition, the smaller the basis weight, the better the liquid permeability, but it is preferable. However, from the viewpoint of securing extensibility and strength when wet, 8 g / m ² or more is preferable, and 13 g / m ² or less is more preferable.

  The crepe rate of the thin paper of the present invention is 5% or more, preferably 8% or more, and more preferably 10% or more. Thereby, the thin paper of this invention is equipped with sufficient extensibility at the time of water absorption with a soft texture. The crepe rate is 30% or less, preferably 25% or less, and more preferably 20% or less. As a result, the thin paper of the present invention is substantially sufficiently soft. If the crepe rate is too large, the crepe will be unwound by the tension when the sheet travels in the latter stage of the paper machine after the creping process and the processing process of the absorbent article using this thin paper, leading to a decrease in the tension, and the productivity is remarkably deteriorated. Will be allowed to. As a preferable range of the crepe rate, the crepe rate is 5% or more and 30% or less, preferably 8% or more and 25% or less, from the viewpoint of a balance between soft texture and sufficient extensibility when wet. 10% or more and 20% or less are more preferable.

The above crepe rate can be measured by the following method (in-water elongation method).
A rectangular shape of 200 mm is cut out from the thin paper to be measured in the length direction (conveying direction when making the thin paper, MD), and 100 mm in the width direction (direction perpendicular to MD, CD) to obtain a sample. This rectangular sample is immersed in water for 10 minutes, the length C of the MD after 3 minutes is measured, and the crepe rate is calculated by the following equation.
Crepe rate (%) = {(C−200) / 200} × 100
For example, when the length C of the MD after immersion for 10 minutes is 220 mm, the crepe rate of the thin paper calculated by the above formula is 10%.
Carefully peel the tissue from the absorbent article. When the thin paper is bonded to the other part by an adhesive, the thin paper is peeled off by the following procedure. That is, a cold spray is sprayed to solidify the adhesive. Then, while the adhesive is solidified, the thin paper is carefully peeled off from the other parts. When the size is less than 200 × 100 mm, the measurement is performed with the size that can be cut out, and the numbers are replaced by the same formula as the above formula.

  The cationic antibacterial agent used in the present invention eliminates the production source of odor components (biological deodorizing action). That is, in the liquid phase of excretory liquid, the growth of microorganisms and microorganism-derived enzymes that are the cause of production of odorous components is suppressed. This antibacterial action suppresses the generation of a wide variety of odorous components from acidic to alkaline, such as lower fatty acids, phenols, mercaptans, ketones, aldehydes and amines.

Cationic antimicrobial agents, in order to suppress the occurrence of strong rancidity as control of malodor production, are contained in the 0.05 g / ^{m 2} basis weight of not less than, 0.1 g / ^{m 2} or more preferably, 0.20 g / M ² or more is more preferable. The upper limit is not particularly limited from the viewpoint of malodor production, and can be set as appropriate depending on the use of the article used. For example, in the use of absorbent articles, it may be in contact with the user's skin directly or through excreted urine for a long time. There is a possibility that the effect and the permeability of excreted urine passing through the thin paper may be hindered. Therefore, the upper limit is preferably 1.0 g / ^{m 2} or less, more preferably 0.5 g / ^{m 2} or less, 0.3 g / ^{m 2} or less is more preferable. Preferred specific examples of the cationic antibacterial agent will be described later.

The content basis weight of the cationic antibacterial agent can be measured by the following method.
When analyzing from a commercial product etc., each member is peeled off using a dryer, a cold spray, etc., and the target thin paper is obtained. Thereafter, the basis weight of the cationic antibacterial agent in the thin paper can be measured with a liquid chromatograph / mass spectrometer (6140 LC / MS manufactured by Agilent Technologies, ionization method: ESI). Alternatively, a calibration curve can be created, and the content of the cationic antibacterial agent can be measured based on the calibration curve.

Cellulose cellulose fiber used in the present invention, a constituent material of the substrate of the thin paper. The substrate may be a single layer or a plurality of layers of two or more layers. Alternatively, a plurality of sheets of two or more plies may be overlapped, and any one of the plurality of sheets may include cellulose fibers. In particular, when incorporated in absorbent articles, if there are multiple layers of thin paper, it may interfere with the transfer and absorption of excretory fluid into the core, or the absorbent article may become hard and impair the user's wearing feeling. A single layer is preferable.

Said substrate comprising a cellulose cellulose fiber is free of cationic antibacterial agents and other additives, a sheet fiber composition prior to creping, depending on the specific application position of the absorbent article An appropriate basis weight is used. For example, when thin paper is used for covering the absorbent core in the absorbent article, the basis weight of the substrate is preferably 8 g / m ² or more, and more preferably 13 g / m ² or more. Moreover, 40 g / m < ² > or less is preferable and 20 g / m < ² > or less is more preferable. Preferred specific examples of the cellulose fiber material will be described later.

  The thin paper of the present invention may contain other fibers in addition to the cellulose fibers. Examples of other fibers include heat-fusible fibers. As the heat-fusible fiber, fibers that melt by heating and adhere to each other can be used. Specific examples of heat-fusible fibers include polyolefin fibers such as polyethylene, polypropylene, and polyvinyl alcohol, polyester fibers, polyethylene-polypropylene composite fibers, polyethylene-polyester composite fibers, low-melting polyester-polyester composite fibers, and fiber surfaces. Examples thereof include hydrophilic polyvinyl alcohol-polypropylene composite fibers and polyvinyl alcohol-polyester composite fibers. When using a composite fiber, any of a core-sheath type composite fiber and a side-by-side type composite fiber can be used. These heat-fusible fibers can be used alone or in combination of two or more.

  In particular, as described later, it is preferable to contain polyvinyl alcohol fibers from the viewpoint of achieving a high crepe rate. Polyvinyl alcohol fiber has hydrophilicity or water solubility (warm water solubility) and thermal adhesiveness. This characteristic improves the adhesiveness with the dryer surface while improving the integrity of the wet paper in the wet paper drying process (for example, the drying process on the Yankee dryer surface as shown in FIG. 1) during the manufacture of the thin paper. Contributes to improving the crepe rate. In particular, by using polyvinyl alcohol as a constituent fiber of a thin paper as a fiber rather than simply using polyvinyl alcohol as a composition, a large adhesive strength with a dryer surface at the time of production can be obtained with a small blending amount. For example, when the polyvinyl alcohol is applied as a solution (adhesive) instead of fibers as in Patent Document 2, the coating solution migrates (embeds) in the depth direction between the fibers. As a result, the remainder of the sheet surface that contributes to the adhesive strength with the dryer surface is extremely small, and a large amount of blending is required (which becomes a factor of becoming hard). On the other hand, by making polyvinyl alcohol into a fibrous composition as in the present invention, polyvinyl alcohol present on the wet paper surface continues to have a uniform contact on the entire surface of the dryer during the wet paper drying process, Even small amounts produce strong adhesive strength.

From the viewpoint of the above-mentioned production action and the soft texture of the thin paper obtained thereby and the sufficient stretchability when wet, the physical properties of the polyvinyl alcohol fiber are a fiber fineness of 0.1 to 5 dtex, a fiber diameter of 0. 5-30 micrometers (round circle conversion), fiber length 0.5-60 mm, and the dissolution temperature in water 50 degreeC or more are preferable.
In addition, the saponification degree of the polyvinyl alcohol fiber is preferably 70 mol% or more, more preferably 80 mol% or more, and further preferably 90 mol% or more. Thereby, adhesiveness with the dryer surface becomes high. The degree of polymerization of the polyvinyl alcohol fiber is preferably 500 or more, more preferably 1500 or more, from the viewpoint of fiber strength. Such a polyvinyl alcohol fiber can be produced by a known method such as a wet spinning method using water as a solvent, a dry spinning method, or a gel spinning method using an organic solvent.

Moreover, it is preferable that polyvinyl alcohol fiber contains 0.2 mass% or more with respect to a cellulose fiber, 1 mass% or more is more preferable, and 3 mass% or more is still more preferable. As a result, even if it contains a cationic antibacterial agent, it becomes possible to obtain a thin paper with a high crepe rate by improving the adhesive strength with the dryer surface. By reinforcing the sheet strength, the sheet strength is improved.
On the other hand, the upper limit of the content ratio of the polyvinyl alcohol fiber is preferably 10% by mass or less, more preferably 8% by mass or less, and still more preferably 5% by mass or less with respect to the cellulose fiber. Thereby, it can avoid that adhesion | attachment of a dryer surface and a raw material sheet (wet paper) becomes excessive at the time of thin paper manufacture. As a result, peeling failure due to the doctor blade can be avoided, paper breakage during production, resulting in poor productivity, extreme curling on the dryer surface after drying, and handling during processing as an absorbent article due to curling Prevent deterioration.

In the present invention, the freeness of the cellulose fiber containing the heat-fusible fiber is preferably 700 ml or less, more preferably 650 ml or less, more preferably 580 ml or less, from the viewpoint of wet paper strength during processing and the strength of the obtained thin paper. preferable. Further, the lower limit is preferably 300 ml or more, and more preferably 400 ml or more because it causes deterioration of water dispersibility of pulp and deterioration of texture of thin paper.
Freeness is a value indicated by Canadian Standard Freeness (CSF) stipulated in JIS P8121, and beating pulp fibers (a process of mechanically tapping and grinding pulp fibers in the presence of water). ). Usually, the smaller the freeness value, the stronger the degree of beating, the greater the damage of the fibers due to beating, and the more fibrillation proceeds. The pulp fibers can be beaten according to a conventional method using a known beater such as a beater or a disc refiner with respect to a paper material (slurry) in which pulp fibers are dispersed.

  The heat-fusible fiber has a fineness of 0.1 dtex or more, particularly 0.5 dtex or more, and preferably 3 dtex or less. Moreover, when manufacturing the base material of a thin paper, for example by a wet papermaking method, it is preferable that the heat-fusible fiber generally has a fiber length of 2 mm or more and 60 mm or less. Furthermore, it is preferable that the heat-fusible fiber is contained in the thin paper in an amount of 1% by mass to 30% by mass.

  Furthermore, in addition to the fiber component described above, other components may be included. Examples of other components include paper strength reinforcing agents. As the paper strength reinforcing agent, for example, polyamine / epichlorohydrin resin, dialdehyde starch, sponge, carboxymethylcellulose, polyacrylamide and the like can be used. These paper strength reinforcing agents can be used singly or in combination of two or more. The paper strength reinforcing agent is preferably contained in the thin paper in an amount of 0.01% by mass to 30% by mass, particularly 0.01% by mass to 20% by mass.

  The thin paper of the present invention may contain other agents as long as the effects described above are not impaired. For example, polyhydric alcohols, surfactants, other deodorants, various commonly used solvents, oils, gelling agents, salts such as sodium sulfate and N, N, N-trimethylglycine, pH adjusters, oxidation It may contain an inhibitor, an antiseptic, a bactericidal / antibacterial agent, a fragrance, a pigment, an ultraviolet absorber, a chelating agent, and the like.

Next, a preferred embodiment of the thin paper manufacturing method of the present invention will be described with reference to FIGS.
The manufacturing method of the present embodiment includes the following steps.
(I) The process of apply | coating the aqueous coating liquid containing a cationic antibacterial agent to the wet paper containing a cellulose fiber and a heat-fusible fiber.
(Ii) A step of applying a creping adhesive to the dryer surface.
(Iii) A step of bringing the wet paper coated with the aqueous coating solution into contact with the dryer surface coated with the creping adhesive and adhering the wet paper to the dryer surface while drying.
(Iv) The process which peels from the dryer surface using a doctor blade with respect to the fiber sheet which dried the said wet paper, performs a crepe process, and obtains a thin paper.
Moreover, you may have the process of winding up a thin paper (v) as needed with respect to the thin paper obtained through said process.

The step (i) can be performed by, for example, a spray method using the spray nozzle 16 shown in FIG. 2 in the apparatus shown in FIG. The application method of the aqueous coating solution is not limited to this spray method, and can be performed by various commonly used methods. Examples thereof include a brush coating method, a bar coater, a gravure coater, various roll coaters, and a dipping method. Of these, the spray method is preferred from the viewpoint of uniform application to wet paper.
Specifically, the wet paper 20 is transported to the first transport belt 21 in a wet state and is depressurized and dehydrated by a pair of press rolls 22 and 22. Next, the dehydrated wet paper 20 is transported to the second transport belt 23 and applied to the one surface of the wet paper 20 by spraying with the spray nozzle 16 before being introduced into the Yankee dryer 24. Is done. Specifically, touch rolls 25, 25 are arranged at the introduction portion of the Yankee dryer 24 so as to face the peripheral surface of the Yankee dryer 24. The wet paper 20 is guided to the touch rolls 25 and 25 together with the second transport belt 23 and introduced into the Yankee dryer 24. Then, immediately before being guided to the touch rolls 25, 25, the aqueous coating solution sprayed from the spray nozzle 16 is applied to one surface of the wet paper 20. In the method shown in FIG. 1, the aqueous coating liquid is applied by spraying only to one surface of the wet paper 20 (this surface is referred to as a first surface and the opposite side is referred to as a second surface). However, the method is not limited to the case of applying only to one surface, and a method of applying to both surfaces may be used. However, it is preferable to apply on one side to prevent a decrease in liquid permeability of the thin paper. That is, as described above, the pulling force of the liquid due to the capillary action of the fiber from the uncoated surface works, the influence of the coating on the liquid permeation is reduced, and the liquid permeability can be maintained as good. Become.

  The wet paper 20 introduced into the first conveying belt 21 can be formed by a normal method using a normal wet papermaking apparatus. Specifically, a wet paper is formed by dehydrating a suspension containing cellulose fibers and heat-fusible fibers using a papermaking wire or the like. Specifically, wet papermaking has a step of drying while conveying a fibrous web made from a slurry, usually a wire part, a press part, a dryer part, a size press, a calendar part, etc. It is divided and is carried out sequentially. The wet papermaking can be performed according to a conventional method using a paper machine such as a long paper machine, a twin wire paper machine, an on-top paper machine, a hybrid paper machine, or a round paper machine.

As the heat-fusible fiber constituting the wet paper 20, polyvinyl alcohol fiber is preferable.
The content and physical properties of the polyvinyl alcohol fiber are preferably as described above from the viewpoint of enhancing the adhesiveness, realizing a high crepe rate, and realizing a soft texture of the thin paper and sufficient extensibility when wet. . If the content is too small, the adhesiveness with the dryer surface is lowered, so that a large amount of creping adhesive is sprayed, and the residue on the surface of the dryer 24 increases, which may hinder manufacturing. On the other hand, when the amount is too large, the wet paper 20 is too strongly adhered to the surface of the dryer 24, and the paper is easily cut during creping, the sheet curl becomes strong, and it becomes difficult to produce a suitable thin paper. In addition, the content rate of the polyvinyl alcohol fiber here is based on the mass of a cellulose fiber.

  The aqueous coating solution can be prepared, for example, using the apparatus shown in FIG. First, water and a cationic antibacterial agent, which are components of the aqueous coating solution, are charged into the stock solution tank 10. By thoroughly mixing these components using the stirring blade 11, a stock solution of an aqueous coating solution is prepared. The stock solution stored in the stock solution tank 10 is diluted with the dilution water W as necessary, and is sufficiently mixed in the dilution tank 12 using the stirring blade 13. In addition, the aqueous coating liquid obtained in this manner passes through the strainer 14 as necessary to remove coarse substances, and is sent to the spray nozzle 16 by the pump 15. The coarse product is composed of an undissolved cationic antibacterial agent. On the other hand, for example, it is also preferable to adjust the pH of the aqueous coating solution by introducing a basic compound together with the cationic antibacterial agent. By increasing the pH value, it is considered that coarse substances are likely to be finely dispersed. From this viewpoint, the pH of the aqueous coating solution is preferably 5.0 or more, more preferably 6.5 or more, and even more preferably 7.0 or more. Further, from the viewpoint of preventing the viscosity of the aqueous coating solution from excessively increasing, the pH is preferably 9.0 or less, and more preferably 8.5 or less. The pH is preferably 5.0 or more and 9.0 or less, more preferably 6.5 or more and 9.0 or less, and further preferably 7.0 or more and 8.5 or less.

  The aqueous coating solution may contain a chelating agent. This is because the chelating agent forms a complex with a metal ion that may be contained as an impurity in the aqueous coating solution and suppresses the formation of scum caused by the antibacterial agent. From this viewpoint, the concentration of the chelating agent contained in the aqueous coating solution is preferably 0.1% by mass or more, particularly preferably 0.5% by mass or more. Moreover, it is preferable to set it as 2.0 mass% or less, especially 1.5 mass% or less. The concentration of the chelating agent contained in the aqueous coating solution is preferably 0.1% by mass or more and 2.0% by mass or less, and particularly preferably 0.5% by mass or more and 1.5% by mass or less.

  Examples of chelating agents include aminotri (methylenephosphonic acid), 1-hydroxyethylidene-1-diphosphonic acid, ethylenediaminetetra (methylenephosphonic acid), diethylenetriaminepenta (methylenephosphonic acid), and salts thereof, 2-phosphonocarboxylic acid An organic acid or salt thereof such as aminopolyacetic acid or salt thereof such as acid or salt thereof, aspartic acid or salt thereof, amino acid or salt thereof such as glutamic acid or salt thereof, nitrilotriacetic acid or salt thereof, ethylenediaminetetraacetic acid or salt thereof; Examples thereof include citric acid or a salt thereof, pyro- and triphosphate. These chelating agents can be used alone or in combination of two or more.

  Next, the wet paper 20 to which the aqueous coating solution is applied is held on the peripheral surface of the Yankee dryer 24 while being kept in a wet state and conveyed. At that time, the first surface of the wet paper 20 (surface to which the aqueous coating liquid is applied) is directed to the peripheral surface of the Yankee dryer 24. Touch rolls 25, 25 are arranged at the introduction portion of the yankee dryer 24 so as to face the peripheral surface of the yankee dryer 24. The wet paper 20 is guided to the touch rolls 25 and 25 together with the transport belt 24 and introduced into the Yankee dryer 24.

  On the other hand, the step (ii) is performed in parallel with the step (i) separately from the introduction position of the wet paper web 20 before the introduction position. Specifically, the creping adhesive is applied to the surface of the Yankee dryer 24 at a point PP on the river in the rotational direction F of the Yankee dryer 24 rather than the point P1 where the wet paper web 20 is introduced. At this time, for example, the spray nozzle 17 is used. The creping adhesive applied at the point PP is in a dry state before reaching the introduction point P1 of the wet paper web 20.

At this time, the concentration of the coating solution of the creping adhesive is preferably 0.01% or more, more preferably 0.05% or more, and further preferably 0.1% or more in order to obtain sufficient adhesiveness. On the other hand, if the concentration is too high, the viscosity becomes high and uniform spraying from the spray nozzle 17 becomes impossible, so 2.0% or less is preferable, 1.0% or less is more preferable, and 0.7 %% or less is more preferable. . The coating solution concentration is a concentration immediately before coating on the dryer surface, and is a weight percent concentration of an effective portion of the creping adhesive in the coating solution.
Moreover, the coating amount of the creping adhesive coating solution having the above coating solution concentration can be appropriately set by adjusting the peripheral speed and width of the dryer 24 and the flow rate of the spray nozzle 17.

  As the creping adhesive used in the step (ii), a commonly used adhesive can be used without particular limitation. In particular, an adhesive that can eliminate the inhibition of adhesion between the wet paper 20 and the Yankee dryer 24 caused by the cationic antibacterial agent is preferable. In particular, the cationic adhesive is excellent in adhesiveness between the wet paper 20 and the surface of the Yankee dryer 24 as described later. Specific examples include cationized starch, polyamidoamine (PAE) adhesive, molded starch, acetylated starch, and oxidized starch. In particular, cationized starch is particularly preferable because it can provide high adhesive strength (adhesive strength) in a smaller amount than other adhesives and does not inhibit (do not harden) the softness of the sheet.

  The wet paper 20 coated with the aqueous coating liquid in the step (i) and the surface of the Yankee dryer 24 coated with the creping adhesive in the step (ii) merge at the point P1. Thereafter, on the surface of the Yankee dryer 24, the process (iii) is performed between the point P1 and the point P2 where the doctor blade 26 contacts.

In the step (iii), the wet paper 20 in contact with the peripheral surface is dried by the heat generated by the Yankee dryer 24. At the same time, the adhesive strength of the creping adhesive is expressed by the moisture of the wet paper and the heat of the Yankee dryer as follows.
First, the creping adhesive comes into contact with the wet paper 20 in the dry state as described above at the point P1, and is re-dissolved by the moisture of the wet paper 20. Thereafter, the creping adhesive is dried by heating the Yankee dryer 24, whereby the wet paper 20 and the Yankee dryer 24 where the evaporation of moisture proceeds are firmly bonded.
As such an agent that exhibits adhesive strength by drying, re-dissolving and drying, cationized starch capable of expressing high adhesive strength in a small amount is particularly preferable.

This adhesive force development process will be described in detail below with reference to FIGS.
Conventionally as shown in FIG. 3A, a liquid film (hydrophobic film) 20A of a cationic antibacterial agent contained on the first surface of the wet paper 20 is formed. This membrane 20A inhibits the adhesion of hydrogen bonds between the Yankee dryer 24 and the wet paper 20 because of its hydrophobicity.
However, in the manufacturing method of the present invention, a cationic creping adhesive film 24A (dry film) is formed on the surface of the Yankee dryer 24 as shown in FIG. This film 24A (dry film) dissolves with the moisture of the wet paper 20 when the dryer and wet paper contact each other (see FIG. 3C), and then is instantly re-dried by the dryer heat to form a film. To do. At this time, on the wet paper 20 side, the same cationic antibacterial agent forms the hydrophobic film 20A at the same time as the adhesive film 24A. Therefore, it is considered that the continuity of the hydrophobic film 20A is inhibited. As a result, the cationic creping adhesive contacts the wet paper 20 without passing through the hydrophobic film 20 </ b> A, and adsorbs with anionic components such as cellulose fibers of the wet paper 20. At this time, since the creping adhesive is cationic, it is quickly adsorbed during re-dissolution with agents (including polyvinyl alcohol) such as cellulose fiber and paper strength agent, which are anionic components of wet paper, and the dryer 24 Adhesion between the paper and the wet paper becomes possible, and the starch system is particularly excellent in adhesiveness. In this way, the Yankee dryer 24 and the wet paper 20 are firmly bonded.

  At this time, if there is a heat-fusible fiber, particularly polyvinyl alcohol fiber, on the wet paper 20 side, the adhesion between both members is further reinforced. Specifically, the bonding is further strengthened by using the cationic creping adhesive on the Yankee dryer 24 side on one side and the anionic polyvinyl alcohol fiber 8 on the wet paper web 20 side on the other side. However, this adhesive strength cannot be obtained with the polyvinyl alcohol fiber 8 alone. Due to the inhibition of the film formation of the hydrophobic film 20A during the redissolving of the cationic creping adhesive, the appropriate water solubility and thermal adhesiveness of the polyvinyl alcohol fiber 8 are effective for the first time. By such joining, a high creping rate can be realized more stably. Further, it becomes possible to reduce the amount of the creping adhesive applied while maintaining a strong adhesive force, and the remaining adhesive of the obtained thin paper can be suppressed to further improve the soft texture of the sheet.

  From the viewpoint of developing the adhesive force as described above, the heat generation temperature of the Yankee dryer 24 is preferably 80 ° C. or higher, more preferably 110 ° C. or higher, and further preferably 130 ° C. or higher on the outer surface. Moreover, from a viewpoint for preventing the sheet from being excessively dried, 170 ° C. or lower is preferable, and 150 ° C. or lower is more preferable.

  Moreover, as adhesive strength which shows adhesive force, 10 cN / 50mm or more is preferable, 35 cN / 50mm or more is more preferable, and 50 cN / 50mm or more is still more preferable. In addition, the adhesive strength is 180 cN / percent from the viewpoint that if the adhesive strength is too high, there is an increased possibility of problems in productivity such as paper breakage and production interruption when peeling from the dryer by a doctor blade. It is preferably 50 mm or less, more preferably 150 cN / 50 mm or less, and still more preferably 120 cN / 50 mm or less.

Next, at the point P2, the wet paper 20 is a sufficiently dried fiber sheet 27, and the creping process (iv) is performed.
Specifically, at the point P2, the doctor blade 26 comes into strong contact with the circumferential surface of the Yankee dryer 24 and peels the fiber sheet 27 from the circumferential surface. At the time of peeling, a crepe is applied to the fiber sheet 27 to obtain a thin paper 28. If necessary, there may be a step of winding the thin paper 28 obtained by creping with a winding roll 29.

The crepe of the thin paper 28 is applied as follows. Normally, when creping is performed, the circumferential speed (V1) of the Yankee dryer 24 is always higher than the circumferential speed (V2) of the winding roll 29. When the fiber sheet 27 attached to the Yankee dryer 24 is peeled off by the doctor blade 26, a wrinkle-like crepe is formed, and the difference in speed (circumferential speed difference) is compared with that in the case where there is no crepe. The crepe rate C (%) due to increases. On the other hand, the theoretical crepe rate C ₀ in the machine setting is obtained by the following formula from the speed difference between the speeds V1 and V2. C ₀ (%) = (V1−V2) / V2. For example, when V1 is 120 m / min and V2 is 100 m / min, the theoretical crepe rate C ₀ (%) is 20%. However, in tissue paper 28 of the take-up roll 29 made by a wet paper making is, crepe rate of C by the elongation in water method is the same as or smaller with the theoretical crepe rate of C _0.
If the adhesive strength between the Yankee dryer 24 and the fiber sheet 27 is not sufficient, an appropriate tension is not applied between the peeling point P2 and the take-up roll 29. When the adhesive strength is weakened, the creping by the doctor blade 26 is not performed well at P2 and the crepe rate is lowered, so that the path length from P2 to the take-up roll 29 becomes longer, and the tension is lowered. Further, when the adhesive strength is extremely lowered, the peeling point of P2 moves in the P1 direction on the Yankee dryer, and the crepe by the doctor blade 26 may not be formed at all. In this case, the tension is remarkably lowered, the web meanders, and production problems such as the winding shape of the winding roll 29 become distorted.
On the other hand, in the present invention, the bonding between the wet paper 20 and the surface of the Yankee dryer 24 is enhanced as described above. As a result, sufficient tension is applied to the thin paper 28, a high crepe rate can be continuously applied, and production obstacles can be avoided. That is, tissue paper obtained by the above manufacturing method, becomes a high clay-flop index in the range mentioned above.

  When the thin paper 28 obtained by the above method is obtained by applying the aqueous coating liquid from one surface (first surface) side, the thin paper 28 is first compared to the opposite surface (second surface). A large amount of the cationic antibacterial agent is present on the side of the surface. The first reason is that a large amount remains on the spray side by spraying from one side and drying quickly. The second reason is that the antibacterial agent is not completely dissolved in the aqueous coating solution, and undissolved aggregates are present in the aqueous coating solution. This is because, when sprayed to 20, the undissolved aggregates do not penetrate into the fiber sheet and remain on the surface of the spray surface, that is, the surface of the first surface. This is preferable because the pulling force of the liquid due to the capillary action on the opposite surface (second surface) side that has not been applied works to maintain the liquid permeability of the thin paper.

The thin paper of the present invention contains a cationic antibacterial agent, has high deodorizing ability, and has a soft texture like tissue paper and sufficient extensibility when wet. In addition, deodorant ability can be evaluated by the odor sensory evaluation mentioned later. The thin paper of the present invention is applied to various absorbent articles that absorb and retain excretory fluid. For example, a urine collection pad, a disposable diaper, a sanitary napkin, a panty liner, and the like can be given. Further, the thin paper of the present invention can be applied to various components in the absorbent article. For example, as shown in FIG. 4, the thin paper of the present invention can be applied as a core wrap sheet that covers a liquid-retaining absorbent core. At this time, it is preferable that the thin paper has a cationic antibacterial agent unevenly distributed on one surface (first surface) from the viewpoint of liquid permeability. Further, as the arrangement of the first surface, it is preferable to cover the entire absorbent core with the first surface of the thin paper on the outer side and the second surface on the opposite side on the inner side.
FIG. 4 shows the basic structure of the absorbent article. That is, it consists of a liquid-permeable top sheet 1 that comes into contact with the wearer's skin, a leak-proof back sheet 2 that faces the clothing side, and a liquid-retaining absorbent 3 that is disposed between both sheets. Further, a liquid diffusible sublayer sheet 4 may be disposed between the top sheet 1 and the absorber 3 as necessary. The absorber 3 includes an absorbent core 31 that forms a liquid-retaining main body and a covering sheet 32 that covers the entire surface of the absorbent core 31. The thin paper of the present invention is applied to the covering sheet 32. The absorptive core 31 is comprised including liquid absorbing fibers, such as a fluff pulp, or a liquid absorbing fiber and a super absorbent polymer.
Of the surfaces of the absorbent core 31, at least the surface facing the wearer's skin is covered with the thin paper of the present invention (when applied only to the surface facing the skin, the covering sheet 32 is the skin facing surface side. And 2 sheets on the clothing facing surface side.). When the thin paper of the present invention is applied to the covering sheet 32, the cationic antibacterial agent can be surely eluted from the initial stage in the excretion fluid permeation path. This makes it possible to develop a sustained deodorizing action. Moreover, since it exists in the inner side rather than the surface sheet 1 which touches skin, the contact to the skin of a cationic antibacterial agent is suppressed and it is preferable. In this case, arranging the first surface of the thin paper, that is, the surface on the side where the cationic antibacterial agent is unevenly distributed more than the opposite surface, is effective for the deodorizing effect. It is preferable from the viewpoint of expression. Further, as described above, the thin paper of the present invention may have the cationic antibacterial agent uniformly present on both the first surface and the second surface. In this case, it is preferable from the viewpoint of allowing the cationic antibacterial agent to be eluted into the liquid phase even after the excretory liquid has permeated into the absorbent core and maintaining the deodorizing action at a high level. From the same viewpoint, it is preferable to cover the entire surface of the absorbent core 31 with the thin paper of the present invention.
The thin paper of the present invention is not limited to the form shown in FIG. 3, and may be applied to other constituent members. For example, it may be applied to the sublayer sheet 4 instead of or together with the covering sheet 32.

  Next, preferred specific examples of the cellulose fiber and the cationic antibacterial agent contained in the thin paper of the present invention will be described below.

The cellulose cellulose fiber used in the present invention, such as wood pulp, such as softwood kraft pulp and hardwood kraft pulp include natural cellulose fibers cotton pulp and straw pulp, and the like. Alternatively, regenerated cellulose fibers such as rayon and cupra can be used. Furthermore, semi-synthetic cellulose fibers such as acetate can also be used.

  Bulky cellulose fibers can also be used as the cellulose fibers. In the present specification, the term “bulky fiber” means that the fiber shape has a three-dimensional structure such as a twisted structure, a crimped structure, a bent and / or branched structure, or the fiber cross section is extremely thick (for example, the fiber roughness is 0. 0). 3 mg / m or more). Examples of preferred bulky cellulose fibers include fiber roughness of 0.3 mg / m or more, particularly 0.32 mg / m or more, 2 mg / m or less, especially 1 mg / m or less, especially 0.32 mg / m or more. Examples include cellulose fibers of 1 mg / m or less. “Fiber roughness” is used as a measure of fiber thickness in fibers with non-uniform fiber thickness, such as wood pulp. For example, a fiber roughness meter (FS-200 ( Product name) and AJANI EL ECTRONICS LTD.). Examples of cellulose fibers with a fiber roughness of 0.3 mg / m or more include softwood kraft pulp (“ALBACEL” (trade name) from Federal Paper Board Co. and “INDORAYON” (trade name) from PT Inti Indorayon Utama. )] And the like.

  Other examples of preferred bulky cellulose fibers include cellulose fibers having a roundness of the fiber cross section of preferably 0.5 or more, more preferably 0.55 or more, and preferably 1 or less. . Cellulose fibers having a roundness of the fiber cross section of 0.5 or more and 1 or less are preferable because the liquid movement resistance is small and the liquid permeation rate is high. The roundness of the fiber cross section can be measured, for example, by the method described in JP-A-8-246395.

  In general, the cross section of wood pulp is flattened by delignification treatment, and most of its roundness is less than 0.5. In order to make the roundness of such wood pulp 0.5 or more, for example, such wood pulp may be mercerized to swell the cross section of the wood pulp. Thus, as the bulky cellulose fiber, mercerized pulp having a roundness of 0.5 or more and 1 or less obtained by mercerizing wood pulp is also preferable. Examples of commercially available mercerized pulp that can be used in the present invention include “FILTRANIER” (trade name) manufactured by ITT Rayonier Inc., “POROSANIER” (trade name) manufactured by the same company, and the like. In addition, when a cellulose fiber having a fiber roughness of 0.3 mg / m or more and a roundness of the fiber cross section of 0.5 or more and 1 or less is used, a bulky network structure is more easily formed, and the liquid can pass therethrough. This is preferable because the speed is further increased.

  As another example of the bulky cellulose fiber, there is a crosslinked cellulose fiber obtained by crosslinking cellulose molecules within and / or between molecules. Such a crosslinked cellulose fiber has a feature that it can maintain a bulky structure even in a wet state. Although there is no restriction | limiting in particular in the method for bridge | crosslinking a cellulose fiber, For example, the crosslinking method using a crosslinking agent is mentioned. Examples of such crosslinking agents include N-methylol compounds such as dimethylolethyleneurea and dimethyloldihydroxyethyleneurea; polycarboxylic acids such as citric acid, tricarballylic acid and butanetetracarboxylic acid; polyols such as dimethylhydroxyethyleneurea A cross-linking agent for polyglycidyl ether compounds. In particular, a crosslinking agent of a polycarboxylic acid or a polyglycidyl ether compound that does not generate formalin or the like harmful to the human body during crosslinking is preferable.

  These various cellulose fibers can be used alone or in combination of two or more. Cellulose fibers having an appropriate fiber length are used according to the method for producing the thin paper and the specific use of the thin paper. For example, when manufacturing a base material by a wet papermaking method, it is preferable that the fiber length of a cellulose fiber is 1 mm or more and 20 mm or less.

  As the cationic antibacterial agent used in the present invention, those having the above-mentioned antibacterial action can be used without particular limitation. Examples thereof include those described in paragraphs [0015] to [0018] of the specification of JP-A-8-99841. These cationic antibacterial agents may be used alone or in combination of two or more. Cationic antibacterial agents are organic antibacterial agents, and are more leached into excretory fluids such as urine and have a wider antibacterial action than metal ion types such as silver, zinc and copper.

  Among these, quaternary ammonium salts are preferable from the viewpoint of antibacterial properties and safety (skin irritation to skin). The quaternary ammonium salt can be used without particular limitation, and examples thereof include alkylpyridinium salts, benzethonium salts, benzalkonium salts, monoalkyltrimethylammonium salts, dialkyldimethylammonium salts, and the like. Examples thereof include cetylpyridinium chloride, benzethonium chloride, decalinium chloride, didecyldimethylammonium chloride, and the like, and preferably contains at least one selected from the group consisting of these. These cationic antibacterial agents may be used individually by 1 type, and may be used in combination of 2 or more type. In particular, a benzalkonium salt represented by the following formula (1) is preferable.

In Formula (1), R ¹ and R ² represent the same or different methyl group, ethyl group, or a linear or branched alkyl group or alkenyl group having 8 to 20 carbon atoms. X ⁻ represents a monovalent anion.

One of the compounds represented by formula (1) can be used alone or in combination of two or more. In formula (1), as a preferable combination of R ¹ and R ² , for example, a combination in which R ¹ is a methyl group and R ² is a linear or branched alkyl group having 8 to 20 carbon atoms, Examples include a combination in which ¹ and R ² are the same group and the group is a linear or branched alkyl group having 8 to 20 carbon atoms. In these combinations, the alkyl group preferably has 10 to 18 carbon atoms.

Wherein (1), X ^- a monovalent anion represented by is preferably, for example, halide ions or anions active group. The “anionic active group” refers to an ion having an anionic surface active ability.
Examples of the anionic active group include an anionic active group having 6 or more carbon atoms, particularly 10 or more carbon atoms, and a linear or branched alkyl group or alkenyl group having 20 or less carbon atoms, particularly 18 or less carbon atoms. Is preferably used. As such an anion active group, for example, alkyl phosphate ester salt, alkyl carboxylate salt, alkyl sulfonate salt, and alkyl sulfate ester salt are preferably used from the viewpoint of antibacterial activity. In particular, it is preferable to use an alkyl phosphoric acid represented by the following formula (2) from the viewpoint that the antibacterial ability is further enhanced.

In formula (2), one of R ³ and R ⁴ represents a linear or branched alkyl group or alkenyl group having 6 to 20 carbon atoms, and the other represents a hydrogen atom, a methyl group, or an ethyl group.
A preferable combination of R ³ and R ^{4 includes} a combination in which R ³ is a hydrogen atom and R ⁴ is a linear or branched alkyl group having 8 to 20 carbon atoms. More preferably, the alkyl group has 10 to 18 carbon atoms. Having a long-chain alkyl cationic active group (quaternary amine) improves the texture of the paper (bulkness and flexibility), and is preferable as a thin paper.

  Among the above benzalkonium salts, it is particularly preferable to use benzalkonium cetyl phosphate from the viewpoint of high antibacterial properties, safety, and immediate effect. Benzalkonium cetyl phosphate is an organic cationic antibacterial agent that has a good balance between antibacterial properties and low skin irritation (low water solubility), and is relatively safe. It is a preferred agent for use in an article sheet.

  The thin paper of the present invention may contain porous particles and a pH buffer deodorant in addition to the above cationic antibacterial agent. The porous particles are preferably contained in the wet paper together with the cellulose fibers, and the pH buffer deodorant is preferably contained in the aqueous coating solution. The combination of agents may be a combination of a cationic antibacterial agent and porous particles, or a combination of a cationic antibacterial agent and a pH buffering deodorant, and the cationic antibacterial agent, porous particles and pH buffering antibacterial agent. Three combinations of odorants may be used. In particular, the three combinations exhibit a broad deodorizing spectrum against bad odor when excreted fluid such as urine touches thin paper. Thereby, in the absorbent article incorporating the thin paper, it is possible to maintain the deodorizing effect for a long time, which suppresses the odor to a level where it is not felt uncomfortable. For example, even if the absorbent article is worn for a long time (for example, 6 hours) under the harsh conditions in which normal bacteria or intestinal bacteria propagate, it will smell to a level where it does not feel uncomfortable until it is discarded. Deodorant power can be kept extremely low.

The deodorization mechanism by the combination of the three agents is a time axis deodorization mechanism along each stage until malodor occurs, and a pH axis elimination corresponding to a wide range of rot odors having various pH at each generation stage. Broadly divided into odor mechanisms.
The time axis deodorization mechanism has the following three stages. As a first step, the cationic antibacterial agent eliminates the source of odorous components (biological deodorant action). That is, in the liquid phase of excretory liquid, the growth of microorganisms and microorganism-derived enzymes that are the cause of production of odorous components is suppressed. As the second stage, the pH buffering deodorant neutralizes the odor component produced in the liquid phase without being suppressed in the first stage, and stays in the liquid phase as a neutralized salt (chemical deodorization action) ). As the third stage, the porous particles are adsorbed or adsorbed with odorous components that cannot be suppressed in the previous stage and cannot be neutralized, increase over time, cannot be completely dissolved in the liquid phase, and volatilize in the gas phase. Inclusion (physical deodorizing effect).
The deodorization mechanism on the pH axis is prevention of the generation of a wide variety of acidic and alkaline odors (complex odors) at each generation stage. For example, generation of various odors from acidic to alkaline such as lower fatty acids, phenols, mercaptans and amines is prevented. In the first stage, the generation of various odorous components is suppressed by suppressing the growth of microorganisms and microorganism-derived enzymes. In the second stage, changes in the pH of the excretory fluid are captured and buffered to neutralize a wide range of acidic and alkaline odorous components and suppress the generation of odorous gas. In the third stage, the porous particles adsorb and confine a wide variety of odorous gases.

  As described above, the deodorization mechanism by the combination of the above three kinds of agents is comprehensively contained in the time axis and the pH axis matrix with respect to the mechanism of malodor generation. In addition, each stage until the bad odor is generated does not always proceed sequentially in time series, and each stage may be mixed at a certain point in time. That is, the above-mentioned three kinds of agents mixed in thin paper act simultaneously and contain odors comprehensively. In particular, since the cationic antibacterial agent acts on microorganisms that are the source of odor (antibacterial) and controls the production of odorous components, the amount of odorous components in the liquid and the odorous components that evaporate out of the liquid is extremely low. It is done. Since the generation amount is suppressed in this manner, deodorization in the second stage and the third stage can be performed reliably. Therefore, in the combination of the above three agents, it is possible to reduce the content of the porous particles that deal with the odorous component that has been volatilized while enhancing the deodorizing ability. This reduction also contributes to the creation of a soft texture of thin paper. These agents are described in detail below.

  The pH buffering deodorant used in the present invention is an agent that neutralizes acidic and alkaline odorous components generated in a liquid phase such as excretory liquid and reduces the change in pH. That is, it is a neutralizing deodorant by an equilibrium action. Such an agent is not particularly limited, and examples thereof include weak acids and their conjugate bases, or mixtures thereof, weak bases and co-liquid acids thereof, and mixtures thereof. Specifically, citric acid etc. are mentioned as a weak acid. Examples of the salt include alkali metal salts such as Na, K, and Ca. Examples of the weak base include polyhydroxyamine. The pH buffering deodorant does not necessarily need to neutralize all acid and alkali odors at the same time. For example, if citric acid as a weak acid is used alone, it is possible to neutralize and deodorize alkali odors such as amine and ammonia which are one of odor components. Furthermore, neutralization produces a salt of citric acid, and a secondary buffering action occurs. Moreover, even if it is only a sodium citrate simple substance, and it is a mixture of a citric acid and its salt, a buffer effect will arise. The same applies to Tris as a weak base and its salt.

The basis weight of the pH buffering deodorant is to effectively neutralize and deodorize acidic and alkaline odor components that are continuously generated in the excrement of the absorbent article for a long period of time, and not volatilize in the gas phase. 0.05 g / ^{m 2} or more preferably, 0.1 g / ^{m 2} or more preferably, 0.15 g / ^{m 2} or more is more preferable. The upper limit is not particularly limited, but is preferably 2.0 g / m ² or less, more preferably 1.0 g / m ² or less, and still more preferably 0.5 g / m ² or less from the viewpoint of production cost.

  The basis weight of the pH buffering deodorant can be measured using a known ion chromatography analysis method or the like. For example, for analysis of anions such as organic acids and phosphoric acids, alkanolamines, etc., qualitative analysis and inclusion with Dionex ICS-2100 (Thermo Fisher Scientific Inc., conductivity detector, gradient elution method) as an analyzer Basis weight can be measured.

  The pH buffering deodorant is also referred to as at least one selected from the group consisting of organic acids and salts thereof having at least one acid dissociation index pKa (25 ° C.) of 5.0 or more (hereinafter also referred to as “agent A”). ) Is preferably included. The organic acid salt is a metal salt such as Na, K, or Ca. By containing this A agent, it acts on the neutralization deodorization of acidic odor components, such as fatty acids, and alkaline odor components, such as amines.

  The acid dissociation index is, for example, (a) the method described in The Journal of Physical Chemistry vol. 68, number 6, page 1560 (1964), (b) a potentiometric automatic titrator (COM-980Win (trade name) manufactured by Hiranuma Sangyo Co., Ltd.) Etc.), and (c) the acid dissociation index described in Chemical Handbook of the Chemical Society of Japan (Revised 3rd edition, published June 25, 1984, published by Maruzen Co., Ltd.) (D) A database such as pKaBASE (trade name) manufactured by CompuDrug can be used.

The basis weight of the agent A in the thin paper varies depending on the target excrement, malodor concentration, and the form of use, but from the viewpoint of deodorizing performance, 0.01 g / m ² or more is preferable, and 0.03 g / m ^2. The above is more preferable, and 0.1 g / m ² or more is still more preferable. The upper limit, excessive basis weight for impairing the strength reduction and texture of the thin paper, preferably 3 g / ^{m 2} or less, more preferably 1 g / ^{m 2} or less, 0.5 g / ^{m 2} or less is more preferable.

  The organic acid having at least one acid dissociation index pKa (25 ° C.) of 5.0 or more is, for example, as an organic dibasic acid, maleic acid (second-stage pKa value: 5.83. The numerical value in the parentheses below is 2) Stage pKa value is represented.), Malonic acid (5.28), 2-methylmalonic acid (5.76), 2-ethylmalonic acid (5.81), 2-isopropylmalonic acid (5.88), 2,2-dimethylmalonic acid (5.73), 2-ethyl-2-methylmalonic acid (6.55), 2,2-diethylmalonic acid (7.42), 2,2-diisopropylmalonic acid (8 .85), m-hydroxybenzoic acid (9.96), p-hydroxybenzoic acid (9.46), 1,2-cyclohexanedicarboxylic acid (trans isomer: 6.06, cis isomer: 6.74), 1 , 2-cyclopentanedicarboxylic acid (trans isomer: 5.9, cis : 6.57), 1,2-cyclooctane dicarboxylic acid (trans isomer: 6.24, cis isomer: 7.34), 1,2-cycloheptane dicarboxylic acid (trans isomer: 6.18, cis isomer: 7 .6), succinic acid (5.24), phenylsuccinic acid (5.55), 2,3-dimethylsuccinic acid (6.0), 2,3-diethylsuccinic acid (6.46), 2-ethyl -3-methylsuccinic acid (6.1), tetramethylsuccinic acid (7.41), 2,3-di-t-butylsuccinic acid (10.26), 3,3-dimethylglutaric acid (6.45), 3,3-diethylglutaric acid (7.42), 3-isopropyl-3-methylglutaric acid (6.92), 3-t-butyl-3-methylglutaric acid (7.49), 3,3-diisopropyl Glutaric acid (7.68), 3-methyl-3-ethyl Glutaric acid (6.70), 3,3-dipropylglutaric acid (7.48), 2-ethyl-2- (1-ethylpropyl) glutaric acid (7.31), cyclohexyl-1,1-diacetic acid (7.08), 2-methylcyclohexyl-1,1-diacetic acid (6.89), cyclopentyl-1,1-diacetic acid (6.77), 3-methyl-3-phenylglutaric acid (6.17). ), 3-ethyl-3-phenylglutaric acid (6.95) and the like.

  Examples of the organic polybasic acid include citric acid (third-stage pKa value: 5.69). Among these, phosphoric acid, citric acid, succinic acid having an acid dissociation index (pKa) of at least 5.2 in at least one dissociation stage from the viewpoint of storage stability such as easy acquisition and increase in internal pressure due to gas generation. It is preferable to include at least one selected from the group consisting of acid, maleic acid, malonic acid and the like, and citric acid is particularly preferable.

The pH buffering deodorant preferably contains at least one selected from the group consisting of a polyhydroxyamine compound and a salt thereof (hereinafter also referred to as “B agent”).
The polyhydroxyamine compound of agent B is a compound represented by the following formula (3).

In formula (3), R ⁵ represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a hydroxyalkyl group having 1 to 5 carbon atoms.
The alkyl group having 1 to 5 carbon atoms may be linear or branched, and examples thereof include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, and various pentyl groups. Examples of the hydroxyalkyl group having 1 to 5 carbon atoms include hydroxymethyl group, 2-hydroxyethyl group, 2-hydroxypropyl group, 3-hydroxypropyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, 4- Examples thereof include a hydroxybutyl group.
R ⁵ is preferably a hydrogen atom, a methyl group, an ethyl group, a hydroxymethyl group, or a 2-hydroxyethyl group from the viewpoint of deodorizing performance and availability, and particularly a hydrogen atom, a hydroxymethyl group, or 2-hydroxy. An ethyl group is preferred.

R ⁶ represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a hydroxyalkyl group having 1 to 5 carbon atoms.
The alkyl group having 1 to 6 carbon atoms may be linear, branched or cyclic. Specific examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, various pentyl groups, various hexyl groups, cyclopentyl groups, and cyclohexyl groups. Moreover, said thing is mentioned as a C1-C5 hydroxyalkyl group.
From the viewpoint of deodorizing performance and availability, R ⁶ is preferably a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a hydroxyethyl group, and particularly preferably a hydrogen atom.

R ⁷ and R ⁸ represent an alkanediyl group having 1 to 5 carbon atoms. R ⁷ and R ⁸ may be the same or different.
As the alkanediyl group having 1 to 5 carbon atoms, a methylene group, an ethylene group, a trimethylene group, a propane-1,2-diyl group, a tetramethylene group, and the like are preferable, and a methylene group is particularly preferable.

Specific examples of the B agent polyhydroxyamine compound include, for example, 2-amino-1,3-propanediol, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-ethyl-1. , 3-propanediol, 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-hydroxyethyl-1,3-propanediol, 4-amino-4-hydroxypropyl-1,7 -Heptanediol, 2- (N-ethyl) amino-1,3-propanediol, 2- (N-ethyl) amino-2-hydroxymethyl-1,3-propanediol, 2- (N-decyl) amino- Examples include 1,3-propanediol and 2- (N-decyl) amino-2-hydroxymethyl-1,3-propanediol.
Among these, from the viewpoint of deodorizing performance and the like, 2-amino-1,3-propanediol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3 One or more selected from -propanediol, 2-amino-2-hydroxymethyl-1,3-propanediol, and 2-amino-2-hydroxyethyl-1,3-propanediol are particularly preferable.
In particular, 2-amino-2-hydroxymethyl-1,3-propanediol, i.e., tris (hydroxymethyl) aminomethane, has an excellent neutralizing action against an acidic odor and has low volatility. This is preferable because of its low odor.

  Said polyhydroxyamine compound can be used individually or in mixture of 2 or more types. The polyhydroxyamine compound can be produced by a usual method.

Content basis weight of the B agent in tissue paper, in terms of deodorizing performance, 0.01 g / ^{m 2} or more preferably, 0.05 g / ^{m 2} or more is more preferable. The upper limit, because excessive basis weight impair the strength reduction and texture of the absorbent article sheet is preferably 3 g / m ² or less, 1 g / m ² or less is more preferable. More preferably 0.01 g / ^{m 2} or more 3 g / ^{m 2} or less, particularly preferably 0.05 g / ^{m 2} or more 1 g / ^{m 2} or less.

In the thin paper of this invention, any one of the A agent and B agent mentioned above may be included as a pH buffer deodorant, and both may be included. The inclusion of both agent A and agent B is more preferable in terms of neutralizing a wide range of odor components. In particular, it is preferable to contain citric acid as the organic acid of agent A and tris (hydroxymethyl) aminomethane as the polyhydroxyamine compound of agent B. In this case, the organic acid of agent A and the polyhydroxyamine compound of agent B and their salts dissolve simultaneously in the excretory fluid from thin paper, and exhibit excellent deodorizing action on the odor component of the excretory fluid due to its buffering properties. To do. Furthermore, the pH buffering deodorant of agent A and agent B is contained in the cellulose fiber sheet substrate in combination with the cationic antibacterial agent described above. By this combination, not only acid odor and alkali odor but also neutral odor that could not be suppressed only by pH buffering deodorant, strongly suppressed the production of odor components, and as a result, this thin paper was used. The absorbent article can maintain a deodorant level at which the odor of the excretory fluid is hardly noticed from the surroundings even when worn for a long time.
Further, in this combination, when the coating material has a specific mixing ratio in the thin paper manufacturing process described later, the particles of the cationic antibacterial agent are reduced in size and can be uniformly applied. Thereby, the antibacterial property of the thin paper of this invention improves.

  Moreover, in the thin paper of the present invention, as the target pH when excretion liquid such as urine comes into contact and the cationic antibacterial agent and the pH buffering deodorant are expressed (disinfection and neutralization), From the viewpoint of deodorant performance (buffer performance can be maintained), 5.0 or higher is preferable, and 5.5 or higher is more preferable. From the same viewpoint, the target pH is preferably 10.0 or less, and more preferably 9.0 or less. Moreover, it is preferable from a viewpoint of safety | security (hypoallergenicity to skin) that the pH of the excretion liquid after an effect | action becomes a neutral region as much as possible.

  The ratio of the masses of the A agent and the B agent is preferably A agent / B agent = 5/95 to 95/5, more preferably 20/80 to 55 /, from the viewpoint of the action by pH and the deodorizing performance. 45 is preferred.

  As the porous particles used in the present invention, those capable of adsorbing or incorporating volatile odorous gas into their pores can be used without particular limitation. For example, acrylic polymer such as porous methacrylic acid polymer and porous acrylic acid polymer, aromatic polymer such as porous divinylbenzene polymer and porous pyridine copolymer, and synthetic porous polymer such as copolymer thereof; chitin And natural porous polymers such as chitosan; activated carbon, silica, silicon dioxide (silica gel), calcium silicate, aluminosilicate compounds, high silica zeolite (hydrophobic zeolite), sepiolite, cancrinite, zeolite, and hydrated zirconium oxide Inorganic porous materials such as silver-supported zeolite, silver-supported cancrinite, and metals such as silver-supported porous styrene-divinylbenzene-vinylpyridine polymer and vinylpyridine copolymers such as silver-supported porous divinylbenzene-vinylpyridine polymer Supported porous Etc. can be mentioned, preferably contains at least one selected from the group consisting future. In particular, it is preferable from the viewpoint of deodorizing performance to contain at least one selected from the group consisting of activated carbon, an aluminosilicate compound and a vinylpyridine copolymer. These porous particles may be used individually by 1 type, and may be used in combination of 2 or more type. Examples of the porous vinylpyridine copolymer include porous styrene-divinylbenzene-vinylpyridine polymer and porous divinylbenzene-vinylpyridine polymer. The silver-supported cancrinite is a cancrinite-like mineral described in paragraphs [0029] to [0045] of JP-A-2005-336363.

From the viewpoint of more efficiently expressing the above action, the porous particles preferably have a BET specific surface area of 50 m ² / g or more, more preferably 100 m ² / g or more, and 200 m ² / g or more. More preferably. The upper limit is not particularly limited, but it is practical to set the upper limit to 2000 m ² / g or less. In addition, the porous particles preferably have an average pore diameter of 2 nm or more, preferably 50 nm or less, and more preferably 30 nm or less. For example, the BET specific surface areas of the activated carbon, the aluminosilicate compound, and the vinylpyridine copolymer described above are about 1750 m ² / g, about 250 m ² / g, about 350 m ² / g, and the average pore diameter is about 4.5 nm, respectively. About 20 nm or about 10 nm can be used. Thus, the larger the value of the BET specific surface area, the higher the odor component adsorption performance. In addition, there are various odor components of excretory fluids such as urine to be deodorized, such as ammonia, amines, fatty acids, hydrogen sulfide and mercaptans, many of which are porous particles because the molecular size exceeds 1 nm. When the pore diameter is 2 nm or more, various odorous components can be adsorbed. Therefore, it is preferable to use porous particles having the above BET specific surface area or average pore diameter because the content of the porous particles can be further reduced while maintaining the deodorizing performance high. Furthermore, it is preferable to use porous particles having both the BET specific surface area and the average pore diameter because the above action is further enhanced. This, combined with the reduction in the content of porous particles by combining with the cationic antibacterial agent described above, improves the texture of the thin paper and improves the feeling of wearing when incorporated into an absorbent article. Make it possible.
The BET specific surface area is measured by a multipoint method using liquid nitrogen using a specific surface area / pore distribution measuring device “ASAP2020” manufactured by Shimadzu Corporation, and the parameter C is positive. A value can be derived. Moreover, the mercury intrusion method can be used for the measurement of the pore distribution.

Content basis weight of the porous particles, from the viewpoint of obtaining a deodorizing effect by the adsorption or inclusion, 0.05 g / ^{m 2} or more preferably, 0.1 g / ^{m 2} or more preferably, 0.5 g / ^{m 2} or more Further preferred. The upper limit is preferably 5 g / m ² or less, more preferably 3 g / m ² or less, and even more preferably 1.0 g / m ² or less because the paper texture is impaired as the content increases.

  The above-mentioned porous particles refer to fine particles having a large number of pores, and examples of the material thereof include inorganic, organic, and polymers, and are not particularly limited. Moreover, the pore diameter should just have a pore diameter of 0.1 nm or more. The shape of the fine particles may be any of a spherical shape, a rod shape having an aspect ratio, a needle shape, and an indefinite shape such as a pulverized shape. In addition, said pore diameter can be measured using the Shimadzu Corporation specific surface area and pore distribution measuring apparatus "ASAP2020". The shape of the fine particles is observed with a scanning electron microscope “JCM-5100” manufactured by JEOL Ltd.

  The above-mentioned activated carbon, aluminosilicate compound and vinylpyridine copolymer can each be added with a further deodorizing function by surface treatment. For example, activated carbon can have a deodorizing function by chemisorption to sulfur-based gas by activation of zinc chloride (ZnCl). Further, the aluminosilicate compound can have an antibacterial action by supporting zinc, and the vinylpyridine copolymer by supporting silver.

  The thin paper of the present invention may contain a β-glucuronidase inhibitor to further enhance the deodorizing effect. A β-glucuronidase inhibitor can suppress the increase of phenolic compounds and indoles, which are causative substances of urine odor, and can continuously suppress the generation of unpleasant urine odor. For example, when the absorbent article incorporating the thin paper of the present invention is discarded, it is possible to suppress the generation of an unpleasant urine odor in the article after disposal due to the action of the β-glucuronidase inhibitor. Become.

  β-glucuronidase is an enzyme that hydrolyzes a compound (glucuronide) in which various alcohols, phenols, amines and the like are conjugated with glucuronide, and is present in many organisms such as bacteria, fungi, plants, and animals. In the present invention, β-glucuronidase derived from bacteria and fungi is important because microorganisms are greatly involved in the degradation of urine excreted outside the body. Specific examples include β-glucuronidase derived from Escherichia coli, Lactobacillus brevis, Propionibacterium acnes, Clostridium perfringens, Staphylococcus haemolyticus, Streptococcus agalactiae, Streptococcus pyogenes, Haemophilus somunus, Shigela sonnei, Aspergillus niger and the like. Β-glucuronidase derived from these microorganisms is classified into an enzyme group having a common domain. Furthermore, β-glucuronidase derived from human plasma is also classified into a similar protein group.

  The β-glucuronidase inhibitor has the β-glucuronidase inhibitory activity which is suppressed by 60% or more by adding 0.1 wt% in the reaction solution in the following method for measuring the β-glucuronidase activity inhibition rate. Say. Furthermore, it is preferable that the activity is suppressed by 80% or more by adding 0.01% by weight in the reaction solution.

<Method for measuring inhibition rate of β-glucuronidase activity>
100 μL of 2 mM p-nitrophenyl-β-D-glucuronide (PNPG) aqueous solution, 40 μL of 0.5 M phosphate buffer (pH 6.8), 38 μL of ion-exchanged water, various compounds or plant extracts in a γ-ray sterilized container Was mixed with 2 μL of 10 or 1 wt% DPG (dipropylene glycol) solution, followed by addition of 20 μL of β-glucuronidase aqueous solution adjusted to 16 units / mL, and the enzyme reaction was performed in a 37 ° C. constant temperature bath for 2 hours. For some compounds, the same experiment was conducted for a 0.1 wt% DPG solution (the concentrations of the supplied compound and the plant extract in the reaction solution were 0.1 wt% and 0.00%, respectively). 01% by weight and 0.001% by weight). In addition, the reaction was performed in the same manner for 2 hours by using DPG instead of the compound and plant extract as a control and using each sample and control with ion-exchanged water added instead of an enzyme solution as a blank. It was. The reaction solution was diluted with 0.2 M glycine buffer (pH 10.4), and the absorbance at a wavelength of 400 nm was measured. From the obtained measured value, the β-glucuronidase activity inhibition rate is determined according to the following formula. In the following formula, change in control absorbance = (absorbance of control−absorbance of blank for each control), and change of sample absorbance = (absorbance of sample−absorbance of blank for each sample).
β-glucuronidase activity inhibition rate (%) = [(control absorbance change−sample absorbance change) / (control absorbance change) × 100

  As the β-glucuronidase inhibitor, those having the aforementioned β-glucuronidase inhibitory activity can be used. Specifically, for example, plant extracts such as goby tannin, tendered yak, akebi; glucarolactone, globanone, mussenone delta, ambrade, sibetone, oxalide, methyl octyne carbonate, estragole, musk TM-II, musk Z-4, 2-phenylcyclopentenone, vetiverol, methylionene-G, cyclamenal hydride, noukaton, D-glucaro-1,4-lactone, cis-jasmon, turpinyl acetate, orbitone, linalyl acetate, phenylethyl isoamyl ether, methyl ionene-A Perfumes such as Muscon, and cationic surfactants can be used. Commercially available products can be used as the cationic surfactant, and examples thereof include sanizol and coatamine (both trade names) manufactured by Kao. Examples of sanisoles include sanisoles B-50 (alkyl benzyl dimethyl ammonium chloride), sanisoles C (alkyl benzyl dimethyl ammonium chloride), and sanisoles P (benzalkonium cetyl phosphate). Coatamine includes coatamine 24P (lauryltrimethylammonium chloride), coatamine 60W (cetyltrimethylammonium chloride), coatamine 86P (conctearyltrimethylammonium chloride), coatamine 86W (stearyltrimethylammonium chloride), coatamine D2345P (dialkyldimethylammonium chloride). ), Cotamine D86P (distearyldimethylammonium chloride), Cotamine E-80K (octadecyloxypropyltrimethylammonium chloride) and the like.

  As a β-glucuronidase inhibitor, one isolated from animals or plants may be used, or one chemically synthesized may be used. In addition, plant extracts such as essential oils containing these compounds, for example, vetiver oil, basil oil, clove oil, cinnamon oil, grapefruit oil and the like may be used as they are as β-glucuronidase inhibitors. Two or more of these compounds or plant extracts may be used in combination.

  The β-glucuronidase inhibitor is preferably one or more selected from the group consisting of the aforementioned plant extract, fragrance and cationic surfactant, and particularly selected from the group consisting of the plant extract and cationic surfactant. One or more of these are preferred. In particular, from the viewpoint of the enzyme inhibitory effect and the dispersion stability of the aqueous detergent, gobicitannin is preferred as the plant extract, glucarolactone and globanone are preferred as the fragrance, and sanizole is preferably used as the cationic surfactant. .

  The concentration of the β-glucuronidase inhibitor is 0.01% by mass or more and 2.0% by mass or less, particularly 0.05% by mass or more and 1.0% by mass or less, particularly 0.1% by mass or more and 0.5% by mass or less. The following is preferable in that the deodorizing effect, the storage stability of the chemical solution, the wiping property, the skin irritation, and the odor transfer property to other products are small.

  In relation to the above-described embodiment, the present invention further discloses the following thin paper and a method for producing the same.

<1>
(I) a step of applying an aqueous coating solution containing a cationic antibacterial agent to a wet paper containing cellulose fibers and heat-fusible fibers;
(Ii) applying a creping adhesive to the dryer surface;
(Iii) contacting the wet paper coated with the aqueous coating solution with the dryer surface coated with the creping adhesive, and adhering the wet paper to the dryer surface while drying; and (iv) the wet paper A method for producing thin paper, comprising a step of peeling the fiber sheet dried from the surface of the dryer using a doctor blade and creping the fiber sheet to obtain thin paper.

<2>
After the step (iv),
(V) The method for producing thin paper according to <1>, further including a step of winding the thin paper.
<3>
In the step (i),
The wet paper web is transported to the first transport belt in a wet state and is depressurized and dehydrated by a pair of press rolls. The dehydrated wet paper web is transported to the second transport belt and passed to the Yankee dryer 24. The thin paper manufacturing method according to <1> or <2>, wherein the aqueous coating liquid is applied to one surface of the wet paper 20 by spraying with a spray nozzle before being introduced.
<4>
In the step (i),
The method for producing thin paper according to any one of <1> to <3>, wherein the aqueous coating liquid is applied by spraying only to one surface of the wet paper.
<5>
The polyvinyl alcohol fiber is included as the heat-fusible fiber, and the polyvinyl alcohol fiber is contained in an amount of 0.2% by mass to 8% by mass with respect to the cellulose fiber, according to any one of <1> to <4>. A method for producing thin paper.
<6>
The thin paper according to any one of <1> to <5>, wherein the step (ii) is performed before the wet paper introduction position and in parallel with the step (i). Production method.
<7>
The pH of the aqueous coating solution is preferably 5.0 or more, more preferably 6.5 or more, still more preferably 7.0 or more, and the pH is preferably 9.0 or less, more preferably 8.5 or less. The manufacturing method of the thin paper of any one of 1>-<6>.
<8>
The coating solution concentration of the creping adhesive is preferably 0.01% or more, more preferably 0.05% or more, still more preferably 0.1% or more, and the coating solution concentration is preferably 2.0% or less. 1.0% or less is more preferable, and 0.7 %% or less is more preferable, The manufacturing method of the thin paper as described in any one of <1> to <7>.
<9>
The method for producing thin paper according to any one of <1> to <8>, wherein the adhesive for creping includes cationized starch.
<10-1>
The method for producing thin paper according to any one of <1> to <9>, wherein 0.01 g / m ² or more of the cationic antibacterial agent is applied.
<10-2>
The method for producing thin paper according to any one of <1> to <10-1>, wherein a crepe rate of the thin paper obtained by the creping processing is 5% or more and 30% or less.
<11>
Thin paper manufactured by the manufacturing method according to any one of <1> to <10-1> and <10-2>.

式（１）中、Ｒ^１及びＲ^２は、同一の若しくは異なるメチル基、エチル基又は炭素数８以上２０以下の直鎖若しくは分岐鎖のアルキル基若しくはアルケニル基を表す。Ｘ⁻は一価のアニオンを表す。
＜２１＞
前記ベンザルコニウム塩がセチルリン酸ベンザルコニウムを含む前記＜２０＞に記載の薄葉紙。
＜２２＞
前記薄葉紙には、前記カチオン性抗菌剤のほか、多孔質粒子及びｐＨ緩衝性消臭剤からなる群から選ばれる少なくとも１種が含有されている前記＜１２＞〜＜２１＞のいずれか１に記載の薄葉紙。
＜２３＞
さらに熱融着性繊維を含む前記＜１２＞〜＜２２＞のいずれか１に記載の薄葉紙。
＜２４＞
前記熱融着性繊維としてポリビニルアルコール繊維を含有する前記＜１２＞〜＜２３＞のいずれか１に記載の薄葉紙。
＜２５＞
前記ポリビニルアルコール繊維は、前記セルロース繊維に対して、０．２質量％以上含有されることが好ましく、１質量％以上がより好ましく、３質量％以上が更に好ましく、前記セルロース繊維に対して、１０質量％以下含有されていることが好ましく、８質量％以下がより好ましく、５質量％以下が更に好ましい、前記＜１２＞〜＜２４＞のいずれか１に記載の薄葉紙。
＜２６＞
前記薄葉紙の一方の面の側に前記カチオン性抗菌剤が多く存在した状態となる前記＜１２＞〜＜２５＞のいずれか１に記載の薄葉紙。
＜２７＞
前記セルロース繊維のフリーネスが３００ｍｌ以上５８０ｍｌ以下である前記＜１２＞〜＜２６＞のいずれか１に記載の薄葉紙。
＜２８＞
さらにβ−グルクロニダーゼ阻害剤を含有する前記＜１２＞〜＜２７＞のいずれか１に記載の薄葉紙。
＜２９＞
前記β−グルクロニダーゼ阻害剤が、植物抽出物としてのゴバイシタンニン、香料としてのグルカロラクトン及びグロバノン、並びにカチオン性界面活性剤としてのセチルリン酸ベンザルコニウムからなる群から選ばれる少なくとも１種を含有する前記＜１２＞〜＜２７＞のいずれか１に記載の薄葉紙。 <12>
A thin paper containing a base material comprising cellulose fibers and a cationic antibacterial agent of 0.01 g / m ² or more and having a crepe rate of 5% or more and 30% or less.
<13>
The crepe rate of the thin paper of the present invention is 5% or more, preferably 8% or more, more preferably 10% or more, and the crepe rate is 30% or less, preferably 25% or less, more preferably 20% or less, The thin paper according to <12>.
<14>
The basis weight of the tissue paper is a 45 g / ^{m 2} or less, preferably 30 g / ^{m 2} or less, more preferably 20 g / ^{m 2} or less,該坪amount is preferably 8 g / ^{m 2} or more, 13 g / ^{m 2} or less More preferably, the thin paper according to <12> or <13>.
<15>
The thin paper according to any one of <12> to <14>, wherein the base material is a single layer.
<16>
The basis weight of the substrate is preferably 8 g / m ² or more, more preferably 13 g / m ² or more, preferably 40 g / m ² or less, more preferably 20 g / m ² or less, <12> to <15> The thin paper according to any one of the above.
<17>
The thin paper according to any one of <12> to <16>, wherein the cationic antibacterial agent contains a quaternary ammonium salt.
<18>
The thin paper according to any one of <12> to <17>, wherein the cationic antibacterial agent contains a benzalkonium salt.
<19>
The cationic antimicrobial agent is contained in the 0.05 g / ^{m 2} basis weight of not less than, 0.1 g / ^{m 2} or more preferably, 0.20 g / ^{m 2} or more preferably, 1.0 g / ^{m 2} or less, more preferably 0.5 g / ^{m 2} or less, 0.3 g / ^{m 2} or less and further preferably, the <12> - tissue paper according to any one of <18>.
<20>
The thin paper according to any one of <12> to <19>, wherein the cationic antibacterial agent includes a benzalkonium salt represented by the following formula (1).

In Formula (1), R ¹ and R ² represent the same or different methyl group, ethyl group, or a linear or branched alkyl group or alkenyl group having 8 to 20 carbon atoms. X ⁻ represents a monovalent anion.
<21>
The thin paper according to <20>, wherein the benzalkonium salt includes benzalkonium cetyl phosphate.
<22>
In any one of the above <12> to <21>, the thin paper contains at least one selected from the group consisting of porous particles and a pH buffering deodorant in addition to the cationic antibacterial agent. Tissue paper as described.
<23>
The thin paper according to any one of <12> to <22>, further comprising a heat-fusible fiber.
<24>
The thin paper according to any one of <12> to <23>, which contains polyvinyl alcohol fiber as the heat-fusible fiber.
<25>
The polyvinyl alcohol fiber is preferably contained in an amount of 0.2% by mass or more, more preferably 1% by mass or more, still more preferably 3% by mass or more, and more preferably 10% by mass with respect to the cellulose fiber. The thin paper according to any one of the above items <12> to <24>, which is preferably contained by mass% or less, more preferably 8 mass% or less, and further preferably 5 mass% or less.
<26>
The thin paper according to any one of <12> to <25>, in which a large amount of the cationic antibacterial agent is present on one side of the thin paper.
<27>
The thin paper according to any one of <12> to <26>, wherein the freeness of the cellulose fiber is 300 ml or more and 580 ml or less.
<28>
The thin paper according to any one of <12> to <27>, further containing a β-glucuronidase inhibitor.
<29>
The β-glucuronidase inhibitor contains at least one selected from the group consisting of gobicitannin as a plant extract, glucarolactone and globanone as a fragrance, and benzalkonium cetyl phosphate as a cationic surfactant. The thin paper according to any one of <12> to <27>.

<30>
The absorbent article using the thin paper obtained by the manufacturing method of said <1>-<11>, or the thin paper of said <12>-<29>.
<31>
Absorbent article obtained by applying the thin paper obtained by the production method of <1> to <11> or the thin paper of <12> to <29> as a core wrap sheet covering a liquid-retaining absorbent core. .

  EXAMPLES Hereinafter, although this invention is demonstrated in more detail based on an Example, this invention is limited to this and is not interpreted. In the examples, “part” and “%” indicating the composition are based on mass unless otherwise specified.

Example 1
(1) Preparation of aqueous coating solution Benzalkonium cetyl phosphate (“Sanisol P” (registered trademark)) manufactured by Kao Corporation was used as a cationic antibacterial agent. After putting ground water and sanizole P into the stock solution tank 10, the mixture was stirred with the stirring blade 11 for 30 minutes to obtain an aqueous coating solution. The hardness of this groundwater was 75 mgCaCO ₃ / L. The concentration of benzalkonium cetyl phosphate in the aqueous coating solution was 5.0%.
(2) Manufacture of base material The base material of a present Example used 90% of softwood kraft pulp as a cellulose fiber, and 10% of hardwood kraft pulp, and obtained these base sheets by the following method. . In addition, it is the process in one paper machine from the manufacture of the base material described here to the subsequent spray coating of the aqueous coating liquid and creping.
First, 90% of softwood kraft pulp and 10% of hardwood kraft pulp were put into water and disaggregated using a pulper. Next, it was beaten with a refiner to obtain an aqueous slurry (papermaking raw material) of cellulose fiber raw material having a freeness of 580 ml (CSF, JISP-8121, ISO5267 / 2). Polyvinyl alcohol fiber (trade name: VBP107-1, fineness: 1.1 dtex, fiber diameter: 11 μm (round circle conversion), cut length: 3 mm, dissolution temperature in water: 70 ° C., manufactured by Kuraray Co., Ltd.) It was contained 2.0% by mass relative to cellulose fiber material. Polyamine epichlorohydrin (trade name WS-4024, manufactured by Seiko PMC Co., Ltd.) as a wet paper strength agent is 0.35% with respect to the cellulose fiber, and carboxymethyl cellulose (trade name Cellogen WS-C, No. 1 as a dry paper strength agent). Ichi Kogyo Seiyaku Co., Ltd.) was blended 0.1% with respect to the cellulose fiber.
A paper layer was formed on a round net paper making wire using the above paper making raw material to obtain a base material (wet paper 20) having a width direction of 850 mm. This wet paper was used as a base material before processing.
(3) Manufacture of thin paper (Continuing from the operation of (1)), thin paper was manufactured using the apparatus shown in FIGS. The wet paper 20 was dehydrated with a press roll 22 and sprayed with an aqueous coating solution using 16 spray nozzles. The above-mentioned 5.0% aqueous coating solution was transferred from the raw material tank 10 to the dilution tank 12, diluted with water, and stirred with the stirring blade 13, so that the anisol P was 1.2%. Subsequently, it was passed through a strainer 14 having an opening of 150 μm, and the discharge flow rate from one spray nozzle 16 was adjusted to 0.3 L / min by adjusting the discharge pressure of the pump 15. Five spray nozzles were installed in parallel at an equal interval of 200 mm in the paper making width direction, and uniformly applied to the entire width direction without unevenness. As the spray nozzle, a Unijet standard spray nozzle (flow rate size 0067, manufactured by Spraying Systems Japan Co., Ltd.) was used. In parallel with the spraying of the aqueous coating solution, the surface of the Yankee dryer is sprayed with cationized starch “DD4280” (trade name, manufactured by Seiko PMC Co., Ltd.) as a creping adhesive at a coating solution concentration of 0.1%. Spray application was performed from the nozzle 17. Thereafter, the absorbent article sheet creped by the doctor blade was wound up. The peripheral speed of the Yankee dryer was 128 m / min, and the peripheral speed of the winding roll 29 was 100 m / min.
The crepe rate of the obtained thin paper was 23% as measured by the measurement method described above (in-water elongation method). The basis weight of the thin paper was 16 g / m ² . In the thin paper, as a result of the yield in the production process (cationic antibacterial agent: about 50%), the content basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² .

(Example 2)
In the production of the base material, 0.5 g / m ^{2 of} papermaking raw material was blended with activated carbon (zinc chloride activated) (“SA1000” (trade name) manufactured by Futamura Chemical Co., Ltd.) having a BET specific surface area of 1750 m ² / g as porous particles. A thin paper was obtained in the same manner as in Example 1 except that wet papermaking was performed.
The crepe rate of the thin paper of Example 2 was 10%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² .

(Example 3)
A thin paper was obtained in the same manner as in Example 2 except that the concentration of benzalkonium cetyl phosphate in the liquid to be sprayed was 0.6% in the preparation of the aqueous coating liquid.
The crepe rate of the thin paper of Example 3 was 11%. The content basis weight of cetyl phosphate benzalkonium is 0.05 g / ^{m 2,} containing a basis weight of the porous particles was 0.5 g / ^{m 2.}

Example 4
A thin paper was obtained in the same manner as in Example 3 except that the amount of activated carbon was 1.0 g / m ² in the production of the substrate.
The crepe rate of the thin paper of Example 4 was 5%. The content basis weight of cetyl phosphate benzalkonium is 0.05 g / ^{m 2,} containing a basis weight of the porous particles was 1.0 g / ^{m 2.}

(Example 5)
Example 2 except that the concentration of benzalkonium cetyl phosphate in the liquid to be sprayed was 0.12% in the preparation of the aqueous coating solution, and the compounding amount of activated carbon was 3.0 g / m ² in the preparation of the base material. In the same manner, a thin paper was obtained.
The crepe rate of the thin paper of Example 5 was 15%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.01 g / m ² , and the containing basis weight of the porous particles was 3.0 g / m ² .

(Example 6)
In the preparation of the substrate, the polyvinyl alcohol fibers, except which contains 0.5 wt% relative to the cellulose cellulose fiber raw material to obtain a thin paper in the same manner as in Example 2.
The crepe rate of the thin paper of Example 6 was 7%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² .

(Example 7)
In the preparation of the substrate, the polyvinyl alcohol fibers, the cellulose cellulose fiber material relative to contain 5.0 mass%, in the production of tissue paper, except coated with cationic starch in the coating solution concentration of 0.05% is Thin paper was obtained in the same manner as in Example 2.
The crepe rate of the thin paper of Example 7 was 10%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² .

(Example 8)
In the preparation of the substrate, the polyvinyl alcohol fibers, the cellulose cellulose fiber material 8.0 wt% is contained with respect to, the production of tissue paper, except coated with cationic starch in the coating solution concentration of 0.05% is Thin paper was obtained in the same manner as in Example 2.
The crepe rate of the thin paper of Example 8 was 10%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² .

Example 9
In the preparation of the substrate, the polyvinyl alcohol fibers, the cellulose cellulose fiber material is contained 0.2 wt% with respect to, the production of tissue paper, except coated with cationic starch in the coating solution concentration of 0.5% is Thin paper was obtained in the same manner as in Example 2.
The crepe rate of the thin paper of Example 9 was 10%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² .

(Comparative Example 1)
A thin paper was obtained in the same manner as in Example 2 except that the polyvinyl alcohol fiber was not contained in the production of the base material and the cationized starch was not applied in the production of the thin paper.
The crepe rate of the thin paper of Comparative Example 1 was 0%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² .

(Comparative Example 2)
A thin paper was obtained in the same manner as in Example 2 except that the polyvinyl alcohol fiber was not contained in the production of the base material, and that the cationized starch was applied at a coating solution concentration of 0.5% in the production of the thin paper.
The crepe rate of the thin paper of Comparative Example 2 was 3%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² .

(Comparative Example 3)
A thin paper was obtained in the same manner as in Example 2 except that no aqueous coating solution was prepared, no heat-fusible fiber was contained in the base material, and no creping adhesive was applied in the production of the thin paper.
The crepe rate of the thin paper of Comparative Example 3 was 10%. Moreover, the containing basis weight of the porous particles was 0.5 g / m ² .

(Comparative Example 4)
A thin paper was obtained in the same manner as in Example 7 except that the creping adhesive was not applied in the production of the thin paper.
The crepe rate of the thin paper of Comparative Example 4 was 0%. Moreover, the containing basis weight of benzalkonium cetyl phosphate was 0.1 g / m ² , and the containing basis weight of the porous particles was 0.5 g / m ² . Further, the polyvinyl alcohol fibers was contained 5.0 mass% relative to the cellulose cellulose fiber material.

(Comparative Example 5)
In the preparation of the aqueous coating liquid, the concentration of benzalkonium cetyl phosphate in the liquid was 0.06%, and in the preparation of the base material, the same as in Example 2 except that the blending amount of activated carbon was 5.0 g / m ^2. A thin paper was obtained.
The crepe rate of the thin paper of Comparative Example 5 was 11%. The content basis weight of cetyl phosphate benzalkonium is 0.005 g / ^{m 2,} was contained basis weight 5.0 g / ^{m 2} of the porous particles.

(Evaluation)
1. Texture 5 professional panelists (including 3 qualified care workers) holding the sheets of the example and the comparative example in hand, and the sensory value of the sheet of Example 1 with the softest texture is 5.0. On the contrary, the sensory value of the sheet of Comparative Example 5 having the worst texture was set as 1.0, and the sensory evaluation of the texture was performed while comparing the other Examples and Comparative Examples with the standard. Three sheets were evaluated, and the average value of all the panelists was used as the sensory value of the texture.
The results are shown in Tables 1 and 2.
5: Very soft 4: Soft 3: Slightly soft 2: Slightly hard 1: Hard

2. Odor sensory evaluation First, each thin paper obtained in Examples 1 to 9 and Comparative Examples 1 to 5 was prepared in a size of 170 mm × 200 mm as a covering sheet of the absorber. Each thin paper covered the entire surface of the absorbent core having a composition ratio of pulp / absorbent polymer of 150 (g / m ² ) / 150 (g / m ² ) to prepare an absorbent sample for evaluation. Each of the prepared absorber samples had a size of 70 × 190 mm.
Next, urine used for the test was prepared by the following procedure.
(A) A non-woven fabric having a basis weight of 20 g / m ² and a size of 10 cm × 15 cm (a general-purpose product not subjected to special treatment such as antibacterial and deodorizing) was prepared.
(B) Using the non-woven fabric of (a) moderately moistened with water, each of the three monitors (Researcher, 12 hours after bathing) wipes their lower body well, Stool-derived intestinal bacteria were collected.
(C) Three monitors collected urine, 2.0 g of urine was adhered to the non-woven fabric of (b), sealed in a plastic bag, and allowed to stand in a 36 ° C. atmosphere for 24 hours. Thereby, the microbe in the nonwoven fabric of (b) was propagated.
(D) Thereafter, 300 g of urine collected by each monitor was mixed, and 500 g of the urine was placed in a volumetric flask. The non-woven fabric obtained as a result of (c) was put therein and immersed for 20 minutes with occasional stirring.
Next, 30 g of urine obtained as a result of (d) was gradually injected so as not to overflow into the center of each absorber sample. Each absorbent sample into which urine was injected was sealed in a stainless steel container with a lid. Each container was stored in a constant temperature dryer, kept at 36 ° C. and allowed to stand for 6 hours.
In the meantime, each container after 1, 3, 6 hours was taken out of the thermostatic dryer, and five monitors (at least three people with care qualifications such as nursing care staff starters) performed sensory evaluation based on the following criteria. As a specific method for sensory evaluation, first, the container was taken out of the constant temperature dryer, and the lid was opened, and then allowed to stand for 30 seconds. After that, he sniffed the nose by approaching the container. The average value of the evaluation values was taken as the result of the evaluation test for each absorber sample.
The results are shown in Tables 1 and 2.
5: Strong rot odor 4: Weak rot odor 3: Strong odor easily understood as urine 2: Weak odor recognized as urine 1: Slight odor difficult to distinguish from urine 0: No odor

3. Adhesive strength Since it is difficult to directly measure the adhesive strength between the Yankee dryer 24 and the sheet 27, thin paper was prepared by hand-drawing in each example and comparative example, and a simple roll dryer was used. The adhesive strength was measured.
<Production of thin paper by hand-drawing>
Hereinafter, in each Example and each Comparative Example, the following operations are performed using the same papermaking material slurry, aqueous coating solution, and creping adhesive as described above. Using a square sheet machine (manufactured by Kumagai Riki Kogyo Co., Ltd., upper mesh 150 mesh, lower mesh 20 mesh), a hand-made paper was obtained from a papermaking raw material slurry as a 250 mm square base wet paper. The wet paper was sprayed with a water-based coating solution to obtain a thin paper before drying.
<Evaluation method of adhesive strength>
A creping adhesive is uniformly sprayed on one side of a 300 mm square aluminum foil and dried at 130 ° C. for 1 minute in a blow-type electric dryer so that the dryness is 0.5 g / m ² (solid content). I made it. The aluminum foil was layered so as to cover the entire surface of the thin paper, and was quickly dried at 130 ° C. for 40 seconds with a rotary dryer (standard type, manufactured by Kumagaya Riki Kogyo Co., Ltd.). The two bonded sheets were cut into a square shape so as to be 200 mm in the flow direction of the dryer and 50 mm in the perpendicular direction. Using a tensile tester (manufactured by Shimadzu Corporation, AUTOGRAPH, AG-IS), peeling speed of 300 mm / min, peeling angle of 180 ° C., span length of 10 mm, tensile length of 200 mm, pulling in the flow direction of the dryer, adhesive strength Asked.

4). Productivity (winding meander)
In FIG. 2, when the thin paper 28 is wound, if there is no meandering at the time of winding, it is suppressed to a swing within 5 cm in the width direction from the stable running position (without adjusting the mechanical position), and the roll shape is Good means that the difference in height between the most concave position and the most convex position is within 3 cm on the roll peripheral surface at the time of winding up to 3000 m of the sheet, and this state is stable after 3 hours of continuous production. The state that continues is A, and B is to deviate from it.
A: There is no meandering during winding and the roll shape is good. B: The meandering during winding and the roll shape is poor.

As shown in Table 1, each of the thin papers of Examples 1 to 9 is a material in which the content basis weight of the cationic antibacterial agent is 0.01 g / m ² or more and the crepe rate is 5% or more. At the time of production, it was possible to achieve good production with sufficient adhesive strength by including heat-fusible fibers and applying a creping adhesive. As a result, the obtained thin paper felt soft with a “texture” of 3.0 or more, and the “odor sensory evaluation” was 3.0 or less, which was suppressed to a level that does not feel a rotten odor. .

On the other hand, as shown in Table 2, Comparative Example 1 was not able to impart crepe because neither a heat-fusible fiber nor an adhesive for creping was used in the production of thin paper containing a cationic antibacterial agent ( The crepe rate was 0%) and the productivity was poor. As a result, the texture evaluation was felt as "1.2".
In Comparative Example 2, although the creping adhesive was used, the thin paper was prepared without containing the heat-fusible fiber. Therefore, the thin paper with the crepe rate of “3%” and the crepe rate of 5% or more of the present invention was obtained. There wasn't. Further, the adhesive strength at the time of preparation was “8 cN / 50 mm”, which is one digit, which is much lower than the two-digit value of the example. Therefore, the productivity was poor as “B”. As a result, the texture felt a hardness of “1.5”.

Comparative Example 3 was the production of thin paper that did not contain a cationic antimicrobial agent. Therefore, although neither the heat-fusible fiber nor the adhesive for creping was used, the crepe rate was 10%, with the adhesive strength and the productivity comparable to the examples. However, the sensory evaluation of the odor felt a strong odor of “5”.
In Comparative Example 4, the heat-fusible fiber was contained, but since the creping adhesive was not applied, the crepe could not be applied (crepe rate 0%), and the productivity was poor as “B”. . As a result, the texture evaluation felt “1.5” as hard.

The comparative example 5 was preparation of the thin paper which does not satisfy | fill the structure which makes the content basis weight of a cationic antibacterial agent 0.005g / m < ² > and "the content basis weight 0.01g / m < ² > or more" of this invention. As a result of producing using this heat-fusible fiber and an adhesive for creping, the creping rate and values were inferior to those of Examples. However, the odor sensory evaluation was “4.5”, and a rotting odor was felt. Moreover, despite the high creping rate of “1.0”, the texture was lower than that of the example. This is because the basis weight of the cationic antibacterial agent is less than 0.01 g / m ² , so that the softening effect was not obtained, and the basis weight of the activated carbon that is the porous particles was extremely large, so the hardness was considered to be outstanding. It is thought to be due to.

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorber 31 Absorbent core 32 Cover sheet 4 Sublayer sheet 10 Stock solution tank 11, 13 Stirring blade 12 Dilution tank 14 Strainer 15 Pump 16 Spray nozzle 20 Wet paper 20A Liquid film of cationic antibacterial agent (hydrophobic film)
24A Cationic Creping Adhesive Film 21 First Conveying Belt 22 Press Roll 23 Second Conveying Belt 24 Yankee Dryer 25 Touch Roll 26 Doctor Blade 27 Fiber Sheet 28 Thin Paper

Claims (9)

Cellulose fibers and thermally-fusible fibers and a including a substrate, and a 0.01 g / m ² or more cationic antimicrobial agents, crepe ratio is 5% to 30% tissue paper.   The thin paper according to claim 1, wherein the cationic antibacterial agent contains a quaternary ammonium salt.   The thin paper according to claim 1 or 2, wherein the cationic antibacterial agent contains a benzalkonium salt.   The absorbent article which has the thin paper of any one of Claims 1-3. (I) a step of applying an aqueous coating solution containing a cationic antibacterial agent to a wet paper containing cellulose fibers and heat-fusible fibers;
(Ii) applying a creping adhesive to the dryer surface;
(Iii) contacting the wet paper coated with the aqueous coating solution with the dryer surface coated with the creping adhesive, and adhering the wet paper to the dryer surface while drying; and (iv) the wet paper A method for producing thin paper, comprising a step of peeling the fiber sheet dried from the surface of the dryer using a doctor blade and creping the fiber sheet to obtain thin paper.   6. The method for producing thin paper according to claim 5, wherein the heat-fusible fiber includes polyvinyl alcohol fiber, and the polyvinyl alcohol fiber is contained in an amount of 0.2% by mass to 8% by mass with respect to the cellulose fiber.   The method for producing thin paper according to claim 5 or 6, comprising cationized starch as the creping adhesive. The method for producing thin paper according to any one of claims 5 to 7, wherein 0.01 g / m ² or more of the cationic antibacterial agent is applied. The method for producing thin paper according to any one of claims 5 to 8, wherein a crepe rate of the thin paper obtained by the creping is 5% or more and 30% or less.

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