JP2022082534A - Kitchen paper roll and kitchen paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kitchen paper roll and kitchen paper capable of maintaining water absorption and oil absorption properties.

SOLUTION: A kitchen paper roll 10 comprising kitchen paper formed into a roll state is characterized by that when a measured value of a paper thickness of the kitchen paper is shown as Tr, and, in a cross section of the kitchen paper roll 10 orthogonal to a rotation axis C, when a calculated value obtained by dividing an area S that the kitchen paper occupies by a wound length L of the kitchen paper rolled in the kitchen paper roll 10 is shown as Ti, a restoration value obtained by dividing the measured value Tr by the calculated value Ti is 1.10 or over and the wound length of the kitchen paper rolled in the kitchen paper roll 10 is 20 m-25 m.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to kitchen paper rolls and kitchen papers capable of maintaining water absorption and oil absorption.

Conventionally, kitchen paper widely used in kitchens and the like is required to efficiently absorb water and oil. Therefore, for example, Patent Document 1 discloses a sheet of kitchen paper that is embossed to form gaps between the sheets to improve water absorption and oil absorption.

Japanese Unexamined Patent Publication No. 2013-072156

By the way, kitchen paper that has been devised in the shape and structure of the constituent sheets has a thick paper thickness, and roll-shaped paper towels have a large winding diameter and the number of sheets that can be used tends to be limited. There is. On the other hand, for example, in the case of kitchen paper in which the constituent sheets are embossed, in order to reduce the winding diameter of the kitchen paper roll, if the force of winding the kitchen paper around the paper tube is increased, the shape of the embossing will collapse and water absorption will occur. Oil absorption may be impaired.

Therefore, it is required to determine the shape and structure of the sheets constituting the kitchen paper from the two viewpoints of securing the number of sheets that can be used and maintaining water absorption and oil absorption. Patent Document 1 does not consider this point, and there is still room for improvement in the optimum shape and structure of the sheets constituting the kitchen paper.

An object of the present invention is to provide a kitchen paper roll and kitchen paper capable of maintaining water absorption and oil absorption.

The kitchen paper roll according to the present invention is a kitchen paper roll in which kitchen paper is rolled, and the measured value of the paper thickness of the kitchen paper is Tr, and the cut surface orthogonal to the rotation axis of the kitchen paper roll is described. When the calculated value obtained by dividing the area occupied by the kitchen paper by the roll length of the kitchen paper wound on the kitchen paper roll is Ti, the measured value Tr is divided by the calculated value Ti. The restored value is 1.10 or more, and the roll length of the kitchen paper wound on the kitchen paper roll is 20 m to 25 m.

Further, the kitchen paper according to the present invention can be used by pulling it out from the kitchen paper roll according to the present invention.

According to the present invention, since the shape and structure of the sheet constituting the kitchen paper having water absorption and oil absorption are maintained, it is possible to maintain water absorption and oil absorption.

It is an overall perspective view of the kitchen paper roll which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the kitchen paper drawn out from the kitchen paper roll which concerns on 1st Embodiment, which has embossed which a concave part and a convex part are bonded, (a) is a plan view, (b). Is a sectional view taken along the line IIb-IIb in (a). It is a schematic cross-sectional view of the kitchen paper roll which concerns on 1st form. It is a figure for demonstrating the kitchen paper drawn from the kitchen paper roll which concerns on the 2nd aspect of this invention, which has embossing which convex parts were adhered to each other, and is the figure for demonstrating IIb-IIb of FIG. It is a direction sectional view. It is a figure for demonstrating the kitchen paper drawn from the kitchen paper roll which concerns on 3rd Embodiment of this invention, which was embossed by stacking 2 ply sheets, and is the figure for demonstrating IIb of FIG. 2 (a). -IIb direction sectional view.

The three embodiments of the first to third embodiments for carrying out the kitchen paper roll according to the present invention will be described in detail with reference to FIGS. 1 to 5. However, the present invention is not limited to the aspect of the present embodiment.

<First form>
FIG. 1 shows an overall perspective view of the kitchen paper roll 10 according to the first aspect of the present invention. FIG. 2 is a diagram for explaining a kitchen paper 1 drawn from the kitchen paper roll 10 according to the present embodiment and having an emboss in which a concave portion and a convex portion are adhered to each other. FIG. 2A is a diagram. Is a plan view, and FIG. 2 (b) is a schematic cross-sectional view of FIG. 2 (a) in the IIb-IIb direction. FIG. 3 shows a schematic cross-sectional view of the kitchen paper roll 10 according to this embodiment.

The kitchen paper roll 10 according to this embodiment is configured by winding a 2-ply kitchen paper around a paper tube 14 (rolling core). The two-layer sheet constituting the kitchen paper is embossed with recesses and protrusions before being wound around the paper tube 14, and the embossed protrusions and recesses on the two-layer sheet overlap each other. (So-called nested type) (In the second form described later, the convexities of the embossing applied to the two-layer sheet overlap each other (so-called tip-to-tip type), and in the third form described later, the kitchen paper is composed. One side is embossed (so-called single embossing) with the two layers of sheets stacked on top of each other.

The kitchen paper 1 drawn from the kitchen paper roll 10 according to the present embodiment has a front surface sheet (first layer) 11 on which the first embossed portion 11e is formed and a back surface sheet (second layer) on which the second embossed portion 12e is formed. The layer) 12 and the laminated continuous sheet 13 are laminated. As shown in FIG. 2B, the first embossed portion 11e has a first embossed convex portion 11p on one surface of the surface sheet 11 and a first embossed concave portion 11r corresponding to the first embossed convex portion 11p on the other surface. It is composed of being formed. Further, as shown in FIG. 2B, the second embossed portion 12e has a second embossed concave portion 12r corresponding to the second embossed convex portion 12p on one surface of the back surface sheet 12 and the second embossed convex portion 12p on the other surface. Are formed. That is, a first embossed convex portion 11p is formed on one surface of the front surface sheet 11 so as to correspond to the first embossed recess 11r formed on the other surface of the front surface sheet 11, and one surface of the back surface sheet 12 is formed. Is formed with a second embossed convex portion 12p so as to correspond to the second embossed concave portion 12r formed on the other surface of the back surface sheet 12.

As shown in FIG. 2A, the shapes of the first embossed portion 11e and the second embossed portion 12e applied to the kitchen paper according to this embodiment are patterns in which dot-shaped embossing is arranged in an oblique grid pattern. ing. In the present invention, the shape of the embossing applied to the kitchen paper (that is, the outer contour of the recess of the recess) is not limited to the circular dot shape as in the present invention, and may have corners. When the shape of the embossing has corners, the embossing is less likely to be crushed, and the effect of embossing described later can be maintained. In the present invention, the shape of the embossing applied to the kitchen paper (that is, the outer contour of the recess of the recess) may be polygonal.

In the kitchen paper 1 according to the present invention, one surface of the front surface sheet 11 and one surface of the back surface sheet 12 are adhered to each other via the adhesive portion 15, and are attached to the other surface of the front surface sheet 11 and the other surface of the back surface sheet 12. The first embossed recess 11r and the second embossed recess 12r can be formed, respectively, so that the recesses of the first embossed recess 11r and the second embossed recess 12r are arranged. In the kitchen paper 1 according to the present embodiment, as shown in FIG. 2B, the top of the first embossed convex portion 11p and one surface of the back surface sheet 12, which is not embossed, form an adhesive portion 15. The top of the second embossed convex portion 12p and the unembossed surface of one surface of the surface sheet 11 are bonded via the bonded portion 15. Due to the concave shape of the first embossed recess 11r and the second embossed recess 12r formed by the structure joined in this way, the area in contact with the oil is widened, and the oil can be quickly absorbed.

Further, as shown in FIG. 2B, a gap G is formed between the first embossed convex portion 11p and the second embossed convex portion 12p due to the above-mentioned joined configuration. The gap G makes it possible to confine the absorbed water and improve the water absorption.

<Second form>
FIG. 4 is a diagram for explaining the kitchen paper roll 10'having embossing in which convex portions are adhered to each other according to the second embodiment of the present invention, and is a schematic diagram in the direction IIb-IIb of FIG. 2A. It is a cross-sectional view. Among the elements constituting the kitchen paper roll 10'related to the present embodiment, those having the same function are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

The top view shapes of the first embossed portion 11'e and the second embossed portion 12'e applied to the kitchen paper 1'according to the present embodiment are as shown in FIG. 2A, as in the first embodiment. , It is a pattern in which dot-shaped embossing is arranged.

In the kitchen paper 1'according to the present embodiment, as shown in FIG. 4, the top of the first embossed convex portion 11p and the top of the second embossed convex portion 12p are adhered to each other via the adhesive portion 15. The concave shape of the first embossed recess 11r and the second embossed recess 12r formed by the structure joined in this way increases the area in contact with the oil and quickly absorbs the oil, as in the first form. Is possible.

By joining the plurality of first embossed convex portions 11p and the plurality of second embossed convex portions 12p, a gap G is formed between them as shown in FIG. 2 (b). The gap G makes it possible to confine the absorbed water as in the first form, and improves the water absorption.

<Third form>
FIG. 5 is a diagram for explaining a kitchen paper roll 10'' in which two ply sheets are stacked and embossed according to a third embodiment of the present invention, and is a diagram for explaining the IIb-IIb direction of FIG. 2A. It is a schematic cross-sectional view of. Among the elements constituting the kitchen paper roll 10 ″ according to the present embodiment, those having the same function are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

The top view shape of the first embossed portion 11 ″ e and the second embossed portion 12 ″ e applied to the kitchen paper according to the present embodiment is as shown in FIG. 2 (a), as in the first embodiment. , It is a pattern in which dot-shaped embossing is arranged.

In the kitchen paper according to this embodiment, as shown in FIG. 5, the first embossed portion 11 ″ e and the second embossed portion 12 ″ e are formed by stacking and embossing two-ply sheets. There is. The concave shape of the first embossed recess 11r and the second embossed recess 12r formed by the above embossing process widens the area in contact with the oil and enables quick absorption of the oil, as in the first form. There is.

<Common configurations of kitchen papers according to the first to third forms of the present invention>
It is desirable that the basis weight of one sheet drawn out from the kitchen paper roll according to the present invention (for example, intervening with a cut) and used is 15 to 25 g / m ² . More preferably, it is 19 to 23 g / m ² . The basis weight is based on JIS P 8124 (1998).

In the kitchen paper according to the first to third embodiments of the present invention, as shown in FIGS. 2 (b), 4 and 5, the depths H1 and H'of the first embossed recess 11r and the second embossed recess 12r. 1, H''1 and the heights H2, H'2, and H''2 of the first embossed convex portion 11p and the second embossed convex portion 12p are suitable ranges for effectively exerting the effect of the present invention, respectively. It is 200 to 450 μm. Further, in the kitchen paper according to the first to third embodiments of the present invention, the area (for one piece) of each concave portion or each convex portion is produced so as to be 0.40 to 4.20 mm ² / piece. There is. In the present invention, it is more preferable that the area of each concave portion or each convex portion (for one piece) is 0.40 to 2.00 mm ² / piece. Further, it is appropriate that the density of embossing applied to the kitchen paper according to the first to third embodiments of the present invention is 5.0 to 12.0 pieces / cm ² . The ratio of the area of the recesses per unit area of the kitchen paper according to the first to third embodiments of the present invention is preferably 3% to 50%. In the present invention, the ratio of the area of the recesses per unit area of the kitchen paper is more preferably 3% to 20%. In the kitchen paper according to the first to third embodiments of the present invention, concave portions or convex portions are formed by embossing in a pattern having a separation interval of about 2 to 5 mm.

The kitchen paper rolls according to the first to third embodiments of the present invention are manufactured so as to satisfy certain conditions (for example, restoration rate, lower limit of parameters corresponding to restoration amount, etc.).

In the first embodiment of the present invention, the paper thickness of the kitchen paper 1 drawn from the kitchen paper roll 10 is measured according to ISO12625-3. Let Tr be the measured value of the paper thickness of the kitchen paper 1, and the area S occupied by the kitchen paper on the cut surface orthogonal to the rotation axis C of the kitchen paper roll 10 is the winding length of the kitchen paper wound on the kitchen paper roll 10. When the calculated value obtained by dividing by L is Ti, it is preferable that the restored value obtained by dividing the measured value Tr by the calculated value Ti is 1.10 or more in order to achieve the effect of the present invention. .. The present invention is not limited to this, and the restored values are preferably 1.15 or more, 1.25 or more, 1.27 or more, and 1.40 or more in this order. The paper thickness of the kitchen paper 1 can be measured by various known measuring methods as long as it complies with ISO12625-3. As shown in FIG. 3, the area S occupied by the kitchen paper is π to the square of D / 2 when the diameter (core diameter) of the paper tube 14 is d and the winding diameter of the kitchen paper roll 10 is D. It is a value obtained by subtracting the value obtained by multiplying the square of d / 2 by π from the value obtained by multiplying by.

If the restoration value is 1.10 or more, the embossing shape is stable and oil-absorbent even after the kitchen paper is rolled into a roll and pulled out from the kitchen paper roll because the restoration force is sufficient. Is maintained, and the embossed gap G is maintained, so that water absorption is maintained. On the other hand, if it is less than 1.10, for example, because there is not enough restoring force, the shape of the embossing is deformed when the kitchen paper is rolled into a roll, and even after it is pulled out from the kitchen paper roll. The shape of the emboss may remain deformed, the gap G may be narrowed or the shape of the emboss may be distorted, and water absorption and oil absorption may not be maintained.

Further, when the restored value is 1.10 or more, the theoretical value of the paper thickness becomes smaller than the measured value of the paper thickness (see Examples 1 to 9 in Tables 1 and 2 below), and the winding diameter can be suppressed to a small size. Therefore, the winding length can be lengthened by that amount, and the number of usable sheets can be secured. On the other hand, if it is less than 1.10, the theoretical value of the paper thickness does not change much from the measured value of the paper thickness (see Comparative Examples 1 to 3 in Table 2 below), and the winding diameter does not change, so the winding length is sufficient. It becomes impossible to lengthen it, and there is a possibility that it is not possible to secure a sufficient number of usable sheets.

The paper thicknesses of the kitchen paper 1'and 1'' drawn from the kitchen paper rolls according to the second and third embodiments of the present invention are also measured and actually measured in accordance with ISO12625-3 as in the first embodiment. The restored value obtained by dividing the value Tr by the calculated value Ti is 1.10 or more.

<Manufacturing method of kitchen paper according to the present invention>
The method for producing kitchen paper of the present invention includes a step of making a slurry containing pulp to obtain a one-ply kitchen paper web, a step of embossing a kitchen paper roll, and a step of laminating the kitchen paper web. .. The embossing and laminating steps may be performed in this order, or the laminating may be performed first and then the embossing may be performed. By embossing before the laminating process, the thick feeling of the kitchen paper after laminating can be further enhanced and the usability can be improved. The kitchen paper manufacturing process will be described below in order.

Here, (1) pulp compounding step, (2) pulp beating step, (3) chemical addition step, (5) dehydration step and pressing step (wet crepe processing step), (6) drying step (6) In at least one of the dry crepe processing step) and (8) embossing step, the paper quality of the kitchen paper web can be adjusted so that the restored value of the kitchen paper is within the optimum range. This makes it possible to manufacture kitchen paper corresponding to various uses.

Prior to the step of obtaining a 1-ply kitchen paper web, a step of bleaching the pulp may be included. Examples of the bleaching agent used in the bleaching step include known bleaching agents such as oxygen-based bleaching agents and chlorine-based bleaching agents.

First, the step of obtaining a one-ply kitchen paper web includes a step of obtaining a slurry containing pulp. The step of obtaining this slurry further includes (1) a pulp compounding step, (2) a pulp beating step, and (3) a chemical addition step.

(1) Pulp compounding process
In the pulp compounding process, pulp fibers having a known composition suitable for kitchen paper are adopted and produced, and it is suitable to contain 90 to 100% by mass of virgin pulp. The pulp composition in which the peculiar effect of the present invention becomes remarkable includes coniferous pulp such as NBKP (coniferous kraft pulp) and NUKP (unbleached coniferous pulp), LBKP (broadwood kraft pulp) and LUKP (unbleached broadleaf pulp). It is preferable to mix the broad-leaved pulp and the broad-leaved pulp in an appropriate ratio, and in particular, it is most suitable to set the ratio of the softwood pulp to the broad-leaved pulp to 10:90 to 90:10.

(2) Pulp beating process
In the pulp beating step, the pulp fibers are subjected to a mechanical beating process (for example, a double disc refiner or the like). At this time, the softwood pulp and the hardwood pulp may be beaten independently or may be beaten after being mixed. The pulp fiber can be fibrillated by beating to adjust the paper quality of the kitchen paper web. Here, it is appropriate to set the freeness represented by CSF: Canadian standard freeness of the fiber component (pulp component) contained in the kitchen paper indicating the degree of beating to 300 to 650 ml.

(3) Chemical addition process
In the step of adding the chemical, an arbitrary component may be added to the pulp fiber. Examples of the optional component include a dry paper strength agent, a wet paper strength agent, and the like. Examples of the dry paper strength agent include cationized starch, polyacrylamide (PAM), carboxymethyl cellulose (CMC) and the like. Examples of the wet paper strength agent include polyamide epichlorohydrin, urea, melamine, and heat-crosslinkable polyacrylamide.

The step of obtaining a one-ply kitchen paper web includes a step of making a slurry containing pulp. Paper machines used in the paper making process include, for example, suction breast formers (circular mesh type, long mesh type), twin wire formers, circular mesh formers (C wrap, S wrap), crescent formers, and the like. Can be mentioned. The step of making this slurry further includes (4) a supply step, (5) a dehydration step and a pressing step, (6) a drying step, and (7) a base paper winding step.

(4) Supply process
In the feeding process, the slurry containing pulp is supplied onto the reticulated wire to form a thin layer of pulp. Generally, the wire is a ring of metal or plastic mesh. Here, for example, a method of making a pulp slurry in which a coniferous tree pulp and a broad-leaved tree pulp are mixed to form a wet paper as one uniform layer, and a method of making a pulp slurry in which a coniferous tree pulp and a broad-leaved tree pulp are mixed are made into one sheet. There are a method of forming a wet paper, a method of forming a single wet paper by laminating a coniferous pulp layer and a broadleaf pulp layer, and the like, and any method may be adopted.

(5) Dehydration process and press process
In the dehydration step, the thin layer of pulp is dehydrated by draining the water of the thin layer of pulp under the net while being transferred toward the press part. After the dehydration process, in the pressing process, the wet paper moves from the wire to the felt. By applying pressure to the wet paper with a press roll through the felt, the wet paper is further mechanically squeezed. Here, by applying wet crepe processing (wet crepe processing step) to the wet paper, it is possible to apply a plurality of crepes extending in the width direction of the kitchen paper, and the paper quality of the kitchen paper web can be adjusted. ..

(6) Drying process
In the drying step after the pressing step, for example, a step of blowing hot air toward the wet paper or a step of crimping the dryer cylinder to the outer peripheral surface is preferable. Here, by applying a dry crepe process (dry crepe process) to the dried paper, it is possible to apply a plurality of crepes extending in the width direction of the kitchen paper, and it is possible to adjust the paper quality of the kitchen paper web. can.

(7) Base paper winding process
After the drying step, a base paper winding step is provided. In the base paper winding process, a one-ply base paper winding can be obtained by winding the kitchen paper web finished through the above steps. At this time, it is preferable to wind the kitchen paper web so that the outer surface thereof is the outer peripheral surface of the base paper winding.

Next, in the process of laminating the 1-ply kitchen paper web, two 1-ply base paper winders are placed on a processing machine, and while unwinding, the base paper surface is embossed (8), and the 2-ply base paper is (9). Perform the bonding process.

(8) Embossing process
The embossing step is performed by, for example, using a steel rubber type embossing apparatus and pressurizing with an embossed roll. By changing the pushing amount or pushing pressure of the embossing roll, an embossed shape having a predetermined embossing height can be formed. Here, it is preferable that the embossing process is performed before the bonding step described later. Here, when embossing is provided on the kitchen paper, it is appropriate that the area of the embossing (for one piece) is 0.40 to 2.00 mm2 / piece. Further, it is appropriate that the height of the embossing (depth of the recess) applied to the kitchen paper is 200 to 450 μm. Further, it is appropriate that the density of embossing applied to the kitchen paper is 5.0 to 12.0 pieces / cm2.

(9) Laminating process
In the bonding process, two or more 1-ply kitchen paper webs are laminated and bonded. It is preferable to bond the 1-ply base paper to the 2-ply so that the winding outer surfaces of the base paper winding are on the outside. In this step, for example, after stacking the base papers, an adhesive for bonding is applied to the embossed convex portion of the product, and one ply is laminated. At that time, it is preferable to attach the wipes with the surface pushed by the emboss roll on the outside from the viewpoint of improving the wiping property. Here, it is appropriate that the area of the bonded portion (for one piece) is 0.40 to 1.20 mm2 / piece. Further, it is appropriate that the adhesive strength of the bonded portion is 0.50 to 3.00 N. Further, it is appropriate that the density of the bonded portion is 5.0 to 24.0 pieces / cm2. The measurement of the adhesive strength of the bonded portion can be performed under the same conditions as the following method for measuring the tensile strength.

Conventionally, kitchen paper widely used in kitchens and the like is required to efficiently absorb water and oil, but by embossing the sheets that make up the kitchen paper, gaps are formed between the sheets. For example, Patent Document 1 discloses an attempt to meet the demand.

By the way, kitchen paper that has been devised in the shape and structure of the constituent sheets has a thick paper thickness, and roll-shaped paper towels have a large winding diameter and the number of sheets that can be used tends to be limited. There is. On the other hand, for example, in the case of kitchen paper in which the constituent sheets are embossed, in order to reduce the winding diameter of the kitchen paper roll, if the force of winding the kitchen paper around the paper tube is increased, the shape of the embossing will collapse and water absorption will occur. Oil absorption may be impaired.

Therefore, it is required to determine the shape and structure of the sheets constituting the kitchen paper from the two viewpoints of securing the number of sheets that can be used and maintaining water absorption and oil absorption.

According to the first to third embodiments of the present invention, since the shape and structure of the sheet constituting the kitchen paper having water absorption and oil absorption are maintained, it is possible to maintain water absorption and oil absorption. Become.

Further, since it is possible to make the winding diameter compact and the winding length long while ensuring the water absorption and oil absorption of the kitchen paper, it is possible to secure the number of usable sheets.

Further, according to the first to third embodiments of the present invention, it is possible to improve the wiping property as described later.

In order to effectively exert the effect of the present invention, the elongation in the longitudinal direction of the kitchen paper roll is 10.0% to 25.0%, and the elongation in the width direction of the kitchen paper is 4.0% to 7 It is 0.0%, the tensile strength of the paper towel when dried in the longitudinal direction is 5.0 N to 13.0 N, and the tensile strength of the paper towel when dried in the width direction is 1.5 N to 4.5 N.

Further, in a range suitable for effectively exerting the effect of the present invention, the weight of the kitchen paper roll is 150 g to 320 g, more preferably 200 g to 250 g, the winding diameter D of the kitchen paper roll is 110 mm to 120 mm, and the kitchen paper. The winding length L is 14 m to 35 m, more preferably 20 m to 25 m, the diameter d of the paper tube 14 is 38 mm to 42 mm, and the measured value Tr of the paper thickness of the kitchen paper is 450 μm to 670 μm, more preferably 450 μm to 650 μm. Here, the weight of the kitchen paper roll includes the weight of the paper tube.

<Comparative evaluation of physical properties>
In the kitchen paper rolls according to each of Examples 1 to 9 of the present invention, 22 parameters related to physical properties were comparatively evaluated with respect to Comparative Examples 1 to 3. The comparative evaluation is shown in Tables 1 and 2 below. It should be noted that Examples 1 to 7 and Comparative Examples 1 to 3 are nested types (see FIG. 2 (b)) as in the first embodiment described above, and Example 8 is the second embodiment described above. The tip-to-tip type (see FIG. 4) as described above, and the ninth embodiment is a single embossing (see FIG. 5) as in the third embodiment described above. Comparative Examples 1 to 3 are nested types as in the first embodiment described above, but as will be described later, the restored value, elongation, tensile strength, water absorption, oil absorption, wiping property, etc. are the examples. It is understood from Tables 1 and 2 that the values from 1 to 9 are clearly different.

<About the depth of the recess>
The "depth of the recess" described in Tables 1 and 2 refers to the paper thickness of the base paper before embossing (measured by ISO) and the paper thickness of the product state (measured by ISO) when the configuration is nested. It represents the difference between. That is, the "depth of the recess" represents the difference when the paper thickness of the base paper is subtracted from the measured value Tr of the paper thickness. When the configuration is Tip to Tip, the embossed convex and convex overlap, so the paper thickness is half that of nested. Here, the thickness of the base paper is about 205 μm.

The shape of the recess (depth of the recess) was measured using a 3D shape measuring instrument VR-3000 and an analysis application VR-H2A (both manufactured by KEYENCE). The procedure was as follows I-IV.
I: Using a 3D shape measuring instrument VR-3000, the 3D shape of the recess was photographed at a magnification of 12 times.
II: Using the function of the analysis application VR-H2A, a reference line was set for all the 3D shapes of the recesses.
III: Using the distortion correction function of the shape correction tool provided in the same application, the distortion was corrected for the measurement data of the 3D shape of the recess.
IV: Using the function of the same application, the average value of the depths of the recesses was calculated with the portion below the reference line as the recesses. This was determined by measuring the depth of the recesses at 6 randomly selected locations of 5 samples per level and averaging the total 30 values obtained.

<Density>
Regarding the densities in Tables 1 and 2, the density of the kitchen paper of the present invention is obtained by subtracting the measured value Tr (μm) of the paper thickness of the kitchen paper from the basis weight (g / m ² ) per sheet (1 ply). Then, it is a value (g / cm ³ ) obtained by doubling the value.

<About tensile strength>
Regarding the tensile strength in Tables 1 and 2, the dry tensile strength (T) in the longitudinal direction (longitudinal direction) of the kitchen paper of the present invention is preferably lower than 13.0 N and lower than 11.0 N. Is more preferable, and it is further preferable that it is lower than 10.3N. The dry tensile strength (Y) in the width direction (horizontal direction) of the kitchen paper of the present invention is preferably lower than 4.5N, more preferably lower than 4.0N, and lower than 3.8N. More preferred.

The dry tensile strength (tensile strength in Tables 1 and 2) of the kitchen paper in the present specification is measured by measuring a sample obtained by cutting the kitchen paper into a width of 15 mm and a span length of 100 mm under the condition of a tensile speed of 50 mm / min. It is a value calculated by the average of 10 measurements. For the measurement of the dry tensile strength, for example, a horizontal tensile tester (manufactured by Kumagai Riki Kogyo Co., Ltd.) can be used. The dry tensile strength was measured in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%).

<About growth>
Regarding the elongation in Tables 1 and 2, the elongation rate (%) in the longitudinal direction (longitudinal direction) of the kitchen paper of the present invention is preferably lower than 30.0%, more preferably 25.0% or less. It is preferably 19.0% or less, and particularly preferably 19.0% or less. Further, the elongation rate (%) in the width direction (horizontal direction) of the kitchen paper of the present invention is preferably lower than 10.0%, more preferably 7.0% or less.

The elongation rate of the kitchen paper (elongation in Tables 1 and 2) in the present specification is measured 10 times by measuring a sample obtained by cutting the kitchen paper into a width of 15 mm and a span length of 100 mm under the condition of a tensile speed of 50 mm / min. It is a value calculated by averaging the measurements. The elongation rate was measured in an environment compliant with ISO187 (temperature 23 ± 1 ° C., relative humidity 50 ± 2%).

The growth rate (%) is calculated from the following formula.
Elongation rate (%) = sample elongation (mm) x 100 / span length (mm)
The "tensile strength" and "elongation" can be performed by a test method based on JIS P 8113.

<About water absorption and oil absorption>
Regarding the water absorption and oil absorption in Tables 1 and 2, 0.1 g of ion-exchanged water was applied to the kitchen paper (10 mm x 10 mm) when measuring the water absorption, and 0.05 g of salad oil was applied to the kitchen paper (10 mm x 10 mm) when measuring the oil absorption. It was dropped from a height of 10 mm, and the time (visual) until the liquid was absorbed and the reflection of light disappeared from the sample surface was measured.

Regarding the water absorption degree, if it was 1.1 seconds or less, it was "OK", if it was 0.8 seconds or less, it was "good", and if it was 0.7 seconds or less, it was "excellent".

Regarding the oil absorption degree, if it was 13.9 seconds or less, it was evaluated as "OK", if it was 12.0 seconds or less, it was evaluated as "Good", and if it was 11.0 seconds or less, it was evaluated as "Excellent".

The above dropping method is carried out by a test method based on JAPAN TAPPI pulp and paper test method No.32-2, and the dipping method is carried out by a test based on JAPAN TAPPI pulp and paper test method No.32-1. It is done by the method.

<About wiping property>
The wiping property in Tables 1 and 2 was evaluated on a scale of 1 to 5, and the higher the value, the better the wiping property.

Regarding the "wiping property" of the product, 5 points were "especially excellent" for 50 monitors, 4 points were "excellent", and 3 points were "good". , 2 points were given to those who felt "normal", and 1 point was given to those who felt "inferior".

The average value of the evaluation points of all 50 people was rounded off to the nearest whole number, and the evaluation was made on a scale of 1 to 5.

<Restored value>
When the restored value (Tr / Ti) is 1.10 or more, both the water absorption degree and the oil absorption degree can be obtained as "possible" or more, and the wiping property can be obtained as "2" or more. When the restored value is 1.25 or more, both the water absorption degree and the oil absorption degree are "good" or more and further excellent, and both the wiping property is "4" or more and further excellent. When the restored value is 1.40 or more, both the water absorption degree and the oil absorption degree are "excellent" or more, which is particularly excellent, and both the wiping property is "5" or more, which is further excellent.

As shown in Tables 1 and 2, the restored values according to Example 7, Example 8 and Example 9 of the present invention are 1.12, 1.15 and 1.24, respectively, so that Example 7 According to each of the examples of Example 9, both the water absorption degree and the oil absorption degree are "possible" or more, and the wiping property is "2" or more, respectively. Since the restored values according to Examples 5 and 6 are 1.28 and 1.25, respectively, "good" is obtained for both the water absorption degree and the oil absorption degree according to Examples 5 and 6, respectively. In addition, "4" or more can be obtained for each of the wiping properties. Since the restored values according to Example 1, Example 2, Example 3, and Example 4 are 1.46, 1.40, 1.58, and 1.53, respectively, the restoration values of Examples 1 to 4 are set. According to each embodiment, both the water absorption degree and the oil absorption degree are "excellent", and the wiping property is "5" or more.

As shown in Tables 1 and 2, the restored values of Examples 1 to 9 of the present invention are 1.10 or more, respectively. Therefore, Examples 1 to 9 of the present invention are used. According to each of the examples of 9, the water absorption and the oil absorption can be maintained, and the effect of the present invention of improving the wiping property can be effectively obtained. On the other hand, in Comparative Examples 1 to 3, the restored value is less than 1.10, so that the above-mentioned effect of the present invention cannot be obtained.

The restored value (or wiping property) of the kitchen paper according to the present invention affects the "elongation" of the kitchen paper. The restored value can be said to indicate that the embossing is restored, and the elasticity has an influence. Elongation (%) is related as one of the factors effective for this elasticity. Referring to Tables 1 and 2, the “elongation” of the kitchen papers of Examples 1 to 9 is in the range of 13.4% to 22.7% in the vertical direction (first range). While the lateral direction is in the range of 4.9% to 6.5% (second range), the "elongation" of the kitchen papers of Comparative Examples 1 to 3 deviates from these ranges. The vertical direction is in the range of 24.3% to 25.0%, and the horizontal direction is in the range of 7.5% to 7.8%. That is, by setting the vertical "elongation" of the kitchen paper in the first range and setting the horizontal "elongation" in the second range, the restored value of the kitchen paper roll is 1.10 or more. It is possible to manufacture. The vertical "elongation" and the horizontal "elongation" can be adjusted by crepe processing in (5) dehydration step and pressing step and (6) drying step in the above-mentioned manufacturing steps. In other words, it can be said that the crepe that affects the "elongation" of kitchen paper is effective for wiping.

<Others>
The present invention is not limited to the above-mentioned embodiments, examples, and modifications described everywhere, and can be appropriately modified or modified without departing from the technical idea of the present invention.

For example, in each of the above embodiments, each embodiment, or a modification thereof, the value obtained by dividing the calculated value Ti from the actually measured value Tr is referred to as a “restored value” for convenience, but the restored value is used in the present invention. For example, when the convex portion of the single emboss is inserted into the concave portion when it is made into a roll, and then when it is pulled out from the roll and used as a single piece, Tr> Ti, that is, the appearance restoration is also included. It is a thing.

1, 1', 1'' Kitchen paper 10, 10', 10'' Kitchen paper roll 11 Surface sheet (first layer)
11e, 11'e, 11''e 1st embossed portion 11p 1st embossed convex portion 11r 1st embossed concave portion 12 Back surface sheet (second layer)
12e, 12'e, 12''e 2nd embossed part 12p 2nd embossed convex part 12r 2nd embossed concave part 13 Laminated continuous sheet 14 Paper tube 15 Adhesive part d Paper tube diameter C Rotation axis D Kitchen paper roll diameter G Gap L Volume length S Area occupied by kitchen paper Tr Measured value of paper thickness of kitchen paper Ti Calculated value of paper thickness of kitchen paper

Claims (11)

It is a kitchen paper roll made from kitchen paper.
Let Tr be the measured value of the paper thickness of the kitchen paper, and the area occupied by the kitchen paper on the cut surface orthogonal to the rotation axis of the kitchen paper roll is determined by the winding length of the kitchen paper wound on the kitchen paper roll. When the calculated value obtained by dividing is Ti, the restored value obtained by dividing the measured value Tr by the calculated value Ti is 1.10 or more.
A kitchen paper roll characterized in that the length of the kitchen paper wound around the kitchen paper roll is 20 m to 25 m. The kitchen paper has a tensile strength of 5.0 N to 13.0 N when dried in the longitudinal direction, and the kitchen paper has a tensile strength of 1.5 N to 4.5 N when dried in the width direction. The kitchen paper roll according to claim 1. The kitchen paper roll according to claim 1 or 2, wherein the restored value is 1.15 or more. The kitchen paper roll according to any one of claims 1 to 3, wherein the kitchen paper is provided with a recess by embossing. The kitchen paper roll according to claim 4, wherein the depth of the recess is 200 μm to 450 μm, and the ratio of the area of the recess to the unit area of the kitchen paper is 3% to 50%. The kitchen paper roll according to claim 4 or 5, wherein the outer contour of the recess formed in the kitchen paper has a corner portion. The kitchen paper roll according to claim 6, wherein the outer contour of the recess formed in the kitchen paper has a polygonal shape. The kitchen paper has a first layer and a second layer.
One surface of the first layer and one surface of the second layer are adhered to each other via an adhesive portion.
Any one of claims 4 to 7, wherein the recesses are formed so that the recesses are arranged on the other surface of the first layer and the other surface of the second layer. The kitchen paper roll described in the section. A first embossed convex portion is formed on the one surface of the first layer so as to correspond to the concave portion formed on the other surface of the first layer.
A second embossed convex portion is formed on the one surface of the second layer so as to correspond to the concave portion formed on the other surface of the second layer.
The top of the first embossed convex portion and the unembossed surface of the one surface of the second layer are adhered to each other via the bonded portion, and the second embossed convex portion is formed. The kitchen paper roll according to claim 8, wherein a top portion and a non-embossed surface of the one surface of the first layer are bonded via the bonding portion. The kitchen paper roll according to any one of claims 1 to 9, wherein the weight of the kitchen paper roll is 150 g to 320 g. A kitchen paper that can be used by pulling it out from the kitchen paper roll according to any one of claims 1 to 10.

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