WO2018061290A1

WO2018061290A1 - Disposable wearable article, and attachment method for porous non-woven cloth

Info

Publication number: WO2018061290A1
Application number: PCT/JP2017/017814
Authority: WO
Inventors: 祥丈石川; 彩井手; 森　洋介
Original assignee: 大王製紙株式会社
Priority date: 2016-09-30
Filing date: 2017-05-11
Publication date: 2018-04-05
Also published as: JP6247728B1; CN107874915A; TWI738875B; TW201813606A; CN107874915B; CN208799412U; JP2018051181A

Abstract

[Problem] To reliably secure the peripheral parts of holes to a support sheet while preventing a hot-melt adhesive from causing a sticky feel. [Solution] The present invention addresses the abovementioned problem by comprising: a cover non-woven cloth (20) that has provided therein, at intervals, a plurality of holes (14) that pass from front to back; and a liquid-impermeable sheet (11) that is laminated on the cover non-woven cloth (20). The cover non-woven cloth (20) and the liquid-impermeable sheet (11) are adhered at a prescribed adhesion region by means of a hot-melt adhesive (20H). In the adhesion region, there is no hot-melt adhesive (20H) inside peripheral parts (14i) of regions that overlap the holes (14), and the hot-melt adhesive (20H) is present as a continuous surface outside the peripheral parts (14i) of the regions that overlap the holes (14).

Description

Disposable wearing article and method for attaching perforated nonwoven fabric

The present invention relates to a disposable wearing article having a portion on which a perforated nonwoven fabric is pasted, and a method for pasting a perforated nonwoven fabric.

In many disposable wearing articles such as disposable diapers and sanitary napkins, a liquid-impermeable sheet having air permeability is provided on the back side of the absorbent body in order to ensure air permeability while preventing the absorption liquid from passing through. The back surface of the liquid-impermeable sheet is covered with a cover nonwoven fabric in order to make it look and feel like a cloth.

In this case, if the cover nonwoven fabric is laminated on the air permeable liquid-impermeable sheet, the air permeability is lowered by the amount of the cover nonwoven fabric. One preferable method for solving this problem is to use a perforated nonwoven fabric having many holes penetrating the front and back as the cover nonwoven fabric (see Patent Documents 1 and 2).

However, when the perforated nonwoven fabric is attached to a support sheet such as a liquid-impermeable sheet via a hot melt adhesive, the hot melt adhesive is applied to a position overlapping the hole (for example, see Patent Document 3). There is a possibility that the melt adhesive protrudes or is exposed to the outer surface of the perforated nonwoven fabric through the holes and adheres to the production facility or becomes sticky to the touch. However, if the hot melt adhesive is not applied in the vicinity of the hole, the peripheral part of the hole becomes unfixed, and the peripheral part of the hole may float and deteriorate the appearance and the touch. In addition, when hot melt adhesive is applied to the support sheet, the hot melt adhesive must be present at a position overlapping the hole. If the spraying method is used, there will be a problem of the hot melt adhesive coming off from the hole and the seepage of the hot melt adhesive. It was thought that it could not be adopted because of the presence of melt adhesive.

Japanese Patent Laid-Open No. 2015-128573 JP 2002-178428 A JP 2009-136504 A

Therefore, the main problem of the present invention is to securely fix the peripheral portion of the hole to the support sheet while preventing the hot melt adhesive from becoming sticky to the touch.

A typical aspect of the present invention that solves the above problems is as follows.
<First aspect>
It comprises a perforated nonwoven fabric provided with a large number of holes penetrating on the front and back sides, and a support sheet on which the perforated nonwoven fabric is laminated, and the perforated nonwoven fabric and the support sheet are in a predetermined adhesion region. A disposable wearing article bonded via a hot melt adhesive,
Among the bonding regions, the hot melt adhesive is not present at the center side of the peripheral portion of the region overlapping with the hole, and the hot melt adhesive is present in a continuous surface shape other than the peripheral portion of the region overlapping with the hole. Yes,
A disposable wearing article characterized by the above.

(Function and effect)
With such an adhesive structure, since there is no hot melt adhesive on the center side from the peripheral edge of the region overlapping with the hole, the hot melt adhesive is less likely to feel sticky, and the periphery of the hole is Securely fixed to the support sheet. In addition, since the peripheral part of the area | region which overlaps with a hole is a part close | similar to the peripheral part of a hole, even if the hot-melt-adhesive protrudes in this part, the surface on the opposite side to the support sheet side in a perforated nonwoven fabric by hand There is little direct contact with the hot melt adhesive when touched.

<Second aspect>
The disposable wearing according to the first aspect, wherein the hot melt adhesive is not present in the region overlapping the hole in the adhesive region, and the hot melt adhesive is present in a continuous surface other than the region overlapping the hole. Goods.

(Function and effect)
It is desirable that there is no hot melt adhesive in the region overlapping the hole, including the peripheral edge.

<Third Aspect>
The disposable wearing article according to the first or second aspect, wherein a peripheral portion of a hole in the perforated nonwoven fabric is a warped portion that is warped toward the support sheet.

(Function and effect)
When the peripheral part of the hole in the perforated nonwoven fabric has such a warped part, the hole diameter seen from the support sheet side is small relative to the hole diameter seen from the surface opposite to the support sheet side, and the support sheet side It becomes difficult to touch the hot melt adhesive when touching the surface on the opposite side with the hand. Further, since the warped portion supports the perforated nonwoven fabric with respect to the support sheet like a support column, the warped portion becomes bulky and excellent in air permeability as compared with a non-porous nonwoven fabric having the same basis weight. Furthermore, since the adhesion between the perforated nonwoven fabric and the support sheet is liable to float in the region other than the peripheral portion of the hole, the peripheral portion of the hole adheres securely, and the other region becomes incomplete adhesion (substantially) Excellent softness and softness can be obtained.

<Fourth aspect>
An absorbent article comprising an absorbent body, a liquid-impermeable sheet having air permeability covering the back side of the absorbent body, and a cover nonwoven fabric covering the back side of the liquid-impermeable sheet,
The cover nonwoven fabric is the perforated nonwoven fabric, and the liquid-impermeable sheet is the support sheet.
The disposable wearing article according to any one of the first to third aspects.

(Function and effect)
In absorbent articles, it is common to cover the back side of the absorbent body with a breathable liquid-impermeable sheet, and further cover the outer surface with a cover nonwoven fabric to give a cloth-like appearance, which improves the breathability. From the viewpoint, not only the liquid-impermeable sheet but also the air permeability in the thickness direction of the cover nonwoven fabric and the air permeability between the cover nonwoven fabric and the liquid-impermeable sheet are important. Therefore, it is one preferable form to apply the adhesion structure of the porous nonwoven fabric and the support sheet of the present invention to the adhesion structure of the cover nonwoven fabric and the liquid-impermeable sheet.

<Fifth aspect>
In a method for attaching a perforated nonwoven fabric, a porous nonwoven fabric provided with a large number of holes penetrating the front and back sides and a support sheet are laminated and bonded via a hot melt adhesive in a predetermined adhesion region. ,
After applying the hot melt adhesive in a continuous surface shape without using air, in the adhesion region of the surface on the support sheet side in the perforated nonwoven fabric,
The porous nonwoven fabric coated with the hot melt adhesive is bonded to the support sheet not coated with the hot melt adhesive on the surface of the porous nonwoven fabric,
A method for attaching a perforated nonwoven fabric characterized by the above.

(Function and effect)
In this embodiment, when a hot melt adhesive is applied in a continuous surface shape without using air to the bonding region on the surface of the porous nonwoven fabric on the side of the support sheet, the hot melt adhesion is performed before bonding to the support sheet. A new finding that the surface tension of the agent opens a hole (hole) in the center of the part of the hot melt adhesive that overlaps the hole of the perforated nonwoven fabric, and the opening expands to the periphery of the hole of the perforated nonwoven fabric. Is based. That is, when such a bonding method is adopted, after bonding the perforated nonwoven fabric to the support sheet, there is no hot melt adhesive in the majority of the holes, so that the hot melt adhesive is removed or stained from the holes by air. Since there is no sticking out, it is difficult to feel sticky when touching the surface on the opposite side of the support sheet. In addition, the hot melt adhesive that overlaps the hole moves to the peripheral part of the hole due to surface tension, and the density of the hot melt adhesive in the peripheral part of the hole increases, so the peripheral part of the hole is firmly fixed to the support sheet. .

<Sixth aspect>
The hot melt adhesive has a melt viscosity of 3,000 to 2,600 mPa · s at a temperature of 140 ° C. and a melt viscosity of 1,150 to 1,550 mPa · s at a temperature of 160 ° C.,
The temperature at the time of application of the hot melt adhesive to the perforated nonwoven fabric is 110 to 150 ° C.,
The amount of the hot melt adhesive applied to the porous nonwoven fabric is set to 1.0 to 8.0 g / m ^2, and the open time after the hot melt adhesive is applied to the porous nonwoven fabric is set to 0.1 to 1.0. Second
A method for attaching a porous nonwoven fabric according to a fifth aspect.

(Function and effect)
Adhesion conditions can be determined as appropriate, but it is preferable to be within the above range in order for the hot melt adhesive that overlaps the holes to move quickly to the periphery of the hole and firmly bond the periphery of the hole.

As described above, according to the present invention, there are advantages such as that the peripheral portion of the hole can be securely fixed to the support sheet while preventing the hot melt adhesive from becoming sticky to the touch.

It is a top view which shows the inner surface of the underpants type disposable diaper of an expansion | deployment state. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 1. (A) 4-4 sectional view of FIG. 1, and (b) 5-5 sectional view of FIG. It is a perspective view (hole omitted) of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body of the expansion | deployment state. It is a top view which shows the outer surface of the interior body of a unfolded state with the outline of an exterior body. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. (A) 4-4 sectional view of FIG. 9 and (b) 5-5 sectional view of FIG. It is (a) (c) sectional drawing and (b) (d) top view of the adhesion part of a cover nonwoven fabric. FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. FIG. 3 is a cross-sectional view taken along the line 3-3 of FIG. 1 showing another embodiment. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. (A) 4-4 sectional view of FIG. 14 and (b) 5-5 sectional view of FIG. It is a top view which shows the inner surface of the tape-type disposable diaper of the expansion | deployment state. It is a top view which shows the outer surface of the tape-type disposable diaper of the expansion | deployment state. FIG. 17 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a sectional view taken along line 7-7 in FIG. (A) 8-8 sectional view of FIG. 16, (b) 9-9 sectional view of FIG. 16, and (c) 10-10 sectional view of FIG. It is a principal part enlarged plan view of a cover nonwoven fabric. FIG. 4A is a perspective view, FIG. 5B is a plan view, and FIG. FIG. 4A is a perspective view, FIG. 5B is a plan view, and FIG. FIG. 4A is a perspective view, FIG. 5B is a plan view, and FIG. It is a flowchart of a perforated nonwoven fabric pasting equipment. It is a top view which shows the change at the time of application | coating of a hot-melt-adhesive.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dotted pattern in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (Transfer of hot melt adhesive in a relief printing system) or the like, or the fixed portion of the elastic stretchable member is formed by application to the outer peripheral surface of an elastic stretchable member such as a comb gun or a shroud coating instead of or together with this Is. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

<Example of pants-type disposable diapers>
1 to 7 show a pants-type disposable diaper. The present pants-type disposable diaper extends from the front exterior body 12F constituting the front body F and the rear exterior body 12B constituting the rear body B and from the front exterior body 12F to the rear exterior body 12B through the crotch. The exterior body 12F and the interior body 200 provided inside the exterior body 12B are provided, and both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form the side seal portion 12A. Thus, the openings formed by the front and rear end portions of the

exterior bodies

12F and 12B become the waist openings WO through which the wearer's torso passes, and the lower edges of the

exterior bodies

12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the

exterior bodies

12F and 12B are portions that support the interior body 200 with respect to the wearer's body. The symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the diaper in the deployed state. The full width of is shown.

The pants-type disposable diaper of this embodiment forms a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) and the leg opening LO having the side seal portion 12A. It has an intermediate region L defined as a front-rear direction range (between the front-rear direction region having the side seal portion 12A of the front body F and the front-rear direction region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Normally, when the waist area WO has a boundary where the expansion and contraction stress in the width direction WD changes (for example, the thickness and elongation rate of the elastic expansion / contraction member change), the waist opening WO side is closer to the waist opening WO side boundary. When it becomes the waist part W and there is no such boundary, the waist opening WO side becomes the waist part W rather than the absorber 56 or the interior body 200. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Inner / outer joint)
The interior body 200 can be fixed to the

exterior bodies

12F and 12B by a joining means by material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated embodiment, the inner surface of the

exterior body

12F, 12B is applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 in this case, and the hot melt adhesive applied to the root portion 65 of the side gather 60. It is fixed against. The inner / outer joint part 201 that fixes the inner body 200 and the

outer bodies

12F and 12B can be provided in almost the entire region where both overlap, for example, the inner body 200 may be provided in a portion excluding both ends in the width direction. it can.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. These show the side gathers 60 extended from both sides of the interior body 200 so as to contact the circumference of the wearer's leg in order to prevent excrement from leaking to both sides of the interior body 200.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

The both sides of the top sheet 30 may be folded back to the back side at the side edge of the absorbent element 50, or may be projected to the side from the side edge of the absorbent element 50 without being folded back.

For the purpose of preventing displacement of the top sheet 30 with respect to the back side member, the top sheet 30 is preferably fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive. . In the illustrated form, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 on the front side of the absorbent body 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably 20 ~ 80g / m ^2, more preferably 25 ~ 60g / m ^2. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent body 56, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

The intermediate sheet 40 is preferably fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional displacement with respect to the back side member. . In the illustrated embodiment, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot melt adhesive applied to the back surface thereof.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-permeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as coating with a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11, but has sufficient adhesive strength when bonded to the cover nonwoven fabric 20 described later via a hot-melt adhesive. It is desirable to use a plastic film in order to obtain

The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 so that It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on the left and right.

Further, an excretion indicator whose color is changed by absorption of the liquid component can be provided on the inner side of the liquid-impermeable sheet 11, particularly on the side of the absorber 56.

(Side gather)
The side gathers 60 extend along the both sides of the interior body 200 in the entire front-rear direction LD, and are provided to contact the circumference of the wearer's legs to prevent side leakage. This includes what are called gathers and what are called planar gathers.

The side gathers 60 of the first embodiment shown in FIGS. 3 and 4 are so-called three-dimensional gathers, and stand up from the side of the interior body 200 to the front side. In the side gather 60, the base side portion rises obliquely toward the center in the width direction, and the tip side portion rises obliquely toward the outside in the width direction from the intermediate portion. However, it is possible to make appropriate changes, such as a configuration in which the whole stands up in the center in the width direction.

More specifically, the side gather 60 according to the first embodiment is formed by folding a band-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD at the tip portion. In addition to being folded into two, a plurality of elongated gather elastic elastic members 63 are fixed along the longitudinal direction and spaced apart in the width direction WD between the folded portion and the vicinity of the sheet. is there. A base end portion (an end portion opposite to the sheet folding portion in the width direction WD) of the side gather 60 on the side opposite to the front end portion is located on a side portion on the back side of the liquid-impermeable sheet 11 in the interior body 200. A fixed root portion 65 is formed, and a portion other than the root portion 65 is a main body portion 66 (a portion on the folded portion side) extending from the root portion 65. The main body portion 66 includes a root side portion that extends toward the center in the width direction and a tip side portion that is folded back outward in the width direction from the tip of the root side portion. This form is a surface contact type side gather 60, but a line contact type side gather 60 that is not folded outward in the width direction can also be employed. And while the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed. The gather elastic elastic member 63 along the front-rear direction LD is fixed to the free portion 68 in an extended state.

The gathered nonwoven fabric 62 is a flexible nonwoven fabric excellent in uniformity and concealment, such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), melt blown nonwoven fabric, etc. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the gather elastic elastic member 63, thread rubber or the like can be used. When spandex yarn rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Moreover, as shown in the drawing, a waterproof film 64 can be interposed between the gathered nonwoven fabrics 62 folded in two. In this case, the gathered nonwoven fabric 62 is partially omitted in the portion where the waterproof film 64 is present. However, in order to make the appearance and feel of the product like a cloth, it is necessary that at least the outer surface from the base end to the tip end of the side gather 60 is formed of the gathered nonwoven fabric 62 as shown in the figure. It is.

The number of gather elastic elastic members 63 provided in the free part of the side gathers 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the gather elastic elastic member 63, it will become easy to contact | abut with respect to skin. The gather elastic elastic member 63 may be disposed not only at the tip side but also at the base side.

In the free part 68 of the side gathers 60, hot melt adhesives and heat seals by various coating methods are used to bond the inner and outer layers of the gathered nonwoven fabric 62 and to fix the gather elastic elastic member 63 sandwiched between them. At least one of fixing means by material welding such as an ultrasonic seal can be used. Since the flexibility is lost when the entire inner layer and outer layer of the gathered nonwoven fabric 62 are bonded together, it is preferable that the portions other than the bonding portion of the gather elastic elastic member 63 are not bonded or weakly bonded. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic stretchable member 63 by a coating means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner layer and the outer layer of the gathered nonwoven fabric 62, thereby collecting the gather elastic stretch. A structure in which the elongated elastic elastic member is fixed to the inner layer and the outer layer of the gathered nonwoven fabric 62 and the inner layer and the outer layer of the gathered nonwoven fabric 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the member 63. It has become.

Further, a hot melt adhesive and heat seal by various application methods are used for fixing the waterproof film 64 and the gathered nonwoven fabric 62 incorporated in the side gather 60 and fixing the lying portion 67 to the side surface of the interior body 200. Or at least one of means by material welding such as ultrasonic sealing can be used. In the illustrated embodiment, slot application of hot melt adhesive is used for fixing the waterproof film 64. In addition, the fixed portion 67 in the illustrated form is combined with a hot melt adhesive and a material welding means, but these can be fixed only with one of the means.

The fixing target of the root portion 65 of the side gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200.

In the side gather 60 of the first embodiment configured as described above, the contraction force of the gather elastic elastic member 63 acts so as to bring the both ends in the front-rear direction close to each other. Since they are fixed so as not to be fixed, they are non-fixed free parts, so that only the free parts stand so as to abut on the body side as indicated by arrows in FIG. In particular, when the root portion 65 is located on the back side of the interior body 200, the side gathers 60 stand up so that the side gathers 60 open outward in the width direction in the crotch portion and the vicinity thereof. It comes to contact | abut and a fitting property comes to improve.

The dimensions of the side gathers 60 of the first embodiment can be determined as appropriate. However, in the case of an infant paper diaper, for example, as shown in FIG. 3, the standing height of the side gathers 60 (the body portion 66 in the unfolded state). The width direction length (W6) is preferably 15 to 60 mm, more preferably 20 to 40 mm. In addition, when the side gathers 60 are flatly folded so as to be parallel to the surface of the top sheet 30, the separation distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

The side gathers 60 of the first embodiment include only a three-dimensional gather, but may include both a three-dimensional gather and a planar gather, or may include only a planar gather. 12 and 13 illustrate a second form of side gather 60 that includes both solid gathers and planar gathers. Each side gather 60 is a first portion 61 (planar gathering portion) that protrudes to the side of the interior body 200 from a root portion 65 fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the interior body 200. And a second portion 69 (a three-dimensional gathered portion) that protrudes from the root portion 65 fixed to both sides of the top sheet 30 in the interior body 200 to the front side of the interior body 200. More specifically, a strip-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 extends laterally from the root portion 65 and is folded back to the front side at the tip of the first portion 61. The portion folded back to the front side reaches the second portion 69 through the first portion 61, and is folded at the tip of the second portion 69. As for the overlapping part in the gathered nonwoven fabric 62, the opposing part is joined by a hot-melt adhesive or the like. Moreover, while the front-rear direction both ends of the 2nd part 69 are set as the fallen part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is An unfixed free portion 68 is provided. At least the middle part of the first part 61 in the front-rear direction and the free part 68 of the second part 69 have one or more elastic elastic members 63 extending in the front-rear direction LD or spaced apart in the width direction WD. The free portion 68 of the second portion 69 contracts in the front-rear direction LD due to the contraction force to form a three-dimensional gather that touches around the leg, and the first portion 61 contracts in the front-rear direction LD. Plane gathers around the legs.

Other points regarding the second embodiment, for example, the material of the gathered nonwoven fabric 62 and the material of the gather elastic elastic member 63 are the same as those of the first embodiment, and thus the description thereof is omitted.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be, for example, about 100 to 300 g / m ² when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m ² for filament aggregates, for example. Can do. The fineness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

Although the absorbent body 56 may be rectangular, as shown in FIGS. 1 and 7, as shown in FIGS. 1 and 7, the front end portion, the rear end portion and the narrow end portion 56N which is narrower than the front end portion and the rear end portion. It is preferable that the shape of the hourglass with the above is improved because the fit of the absorbent body 56 and the side gathers 60 around the legs is improved.

Further, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. . Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of disposable diaper can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The ratio of the particles remaining on the top is preferably 30% by weight or less, and the ratio of the particles remaining on the screen by sieving (shaking for 5 minutes) using a standard sieve of 180 μm (JIS Z8801-1: 2006) 60% by weight or more is desirable.

The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

If necessary, the superabsorbent polymer particles can adjust the spray density or spray amount in the plane direction of the absorber 56. For example, it is possible to increase the amount of the liquid excretion site more than other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
The

exterior bodies

12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD (exterior two-split type). The separation distance 12d can be set to about 150 to 250 mm, for example. Moreover, as shown in FIG.14 and FIG.15, the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B (exterior integral type).

The

exterior bodies

12F and 12B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion C that extends from the waist region T to the intermediate region L side. is doing. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. In the illustrated embodiment, the lower edge of the buttock cover portion C is formed in a straight line shape along the width direction WD, as with the lower edge of the front exterior body 12F. It can also be a curve that becomes.

As shown in FIGS. 4 and 5, the exterior bodies 12 F and 12 B are obtained by joining the outer sheet layer 12 S and the inner sheet layer 12 H by a joining means such as a hot melt adhesive or welding. The sheet material for forming the outer sheet layer 12S and the sheet material for forming the inner sheet layer 12H may be a single sheet material as shown in FIG. 5 or may be individual sheet materials. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12S are respectively formed by the inner part and the outer part of one sheet material folded at the edge of the waist opening WO (may be the crotch edge). Is done. In the former form, there is an advantage that the number of sheet materials is small, and in the latter form, there is an advantage that misalignment is difficult when the inner sheet layer 12H and the outer sheet layer 12S are bonded together.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without any particular limitation, but is preferably a non-woven fabric. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, Nonwoven fabrics composed of mixed fibers, composite fibers or the like in which more than one species are used can be used. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, the basis weight is preferably about 10 to 30 g / m ² .

The total weight of the

exterior bodies

12F and 12B is preferably about 20 to 60 g / m ² .

(Extensible / non-extensible area)
The

exterior bodies

12F and 12B are provided with elongated elastic elastic members 15 to 19 such as rubber thread between the outer sheet layer 12S and the inner sheet layer 12H in order to improve the fit of the wearer around the torso. An expansion / contraction region that elastically expands and contracts in the width direction WD with the expansion and contraction of the member is formed. In this stretchable region, in the natural length state, the outer sheet layer 12S and the inner sheet layer 12H are shrunk with the shrinkage of the elastic stretchable member to form wrinkles or wrinkles, and when stretched in the longitudinal direction of the elastic stretchable member, The outer sheet layer 12 S and the inner sheet layer 12 H can be stretched to a predetermined stretch rate that can be fully stretched. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used.

For bonding the outer sheet layer 12S and the inner sheet layer 12H on the

exterior bodies

12F and 12B and fixing the elongated elastic members 15 to 19 sandwiched between them, hot melt adhesives and heat seals by various coating methods are used. At least one of fixing means by material welding such as an ultrasonic seal can be used. Since the flexibility is lost when the entire

exterior bodies

12F and 12B are firmly fixed, it is preferable that the portions other than the adhesive portions of the elongated elastic elastic members 15 to 19 are not adhered or weakly adhered. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic elastic members 15 to 19 by an application means such as a comb gun or a sure wrap nozzle, and sandwiched between the two

sheet layers

12S and 12H, thereby forming the elongated shape. Only the hot melt adhesive applied to the outer peripheral surfaces of the elastic elastic members 15 to 19 is used to fix the elongated elastic elastic members 15 to 19 to both the sheet layers 12S and 12H and to fix the sheet layers 12S and 12H. It has a structure to do. The elastic elastic members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion / contraction direction in the expansion / contraction region.

More specifically, between the outer sheet layer 12S and the inner sheet layer 12H in the waist part W of the

exterior bodies

12F and 12B, a plurality of waist elastic elastic members 17 are vertically arranged so as to be continuous over the entire width direction WD. Attached with a gap. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic elastic members 17, you may overlap with the interior body 200 or the width direction which overlaps with the interior body 200 You may each provide in the width direction both sides except a center part. The waist elastic elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1). the rubber thread .0mm about ^2), 4 is preferably provided about 3 to 22 present at intervals of ~ 12 mm, which by extension ratio in the width direction WD of the waist portion W 150 to 400% particularly about 220 to 320% Is preferred. Moreover, the waist part W does not need to use the waist elastic elastic member 17 of the same thickness for all the front-back direction LD, or make it the same expansion | extension rate, for example, waist part elasticity in the upper part and the lower part of the waist part W You may make it the thickness and expansion | extension rate of the expansion-contraction member 17 differ.

In addition, a plurality of waist lower elastic

elastic members

15 and 19 made of an elongated elastic elastic member are vertically spaced between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower part U of the

exterior bodies

12F and 12B. It is installed with a gap.

The waist elastic

elastic members

15 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. the rubber thread ^1-2 about 1.0mm), 1 ~ 15mm, especially 3 is preferably provided about 5 to 30 yarns at intervals of ~ 8 mm, 200 to elongation in the width direction WD of the waist lower portion U by which 350 %, Particularly about 240 to 300% is preferable.

In addition, a plurality of cover elastic elastic members 16 made of an elongated elastic elastic member are vertically spaced between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover part C of the rear exterior body 12B. It is attached.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 5 ~ 40 mm, particularly 5 is preferably provided about 2 to ten at intervals of ~ 20 mm, this elongation in the width direction WD of the cover portion by 150 to 300% especially 180 to It is preferably 260%.

When providing an inguinal cover portion on the front exterior body 12F, a cover elastic member can be provided in the same manner.

When the elastic

elastic members

15, 16, 19 are provided in the front-rear direction range having the absorber 56 like the waist lower part U and the buttock cover part C in the illustrated form, the width of the absorber 56 in a part or all thereof. In order to prevent the shrinkage in the direction WD, the intermediate in the width direction (preferably including the entire inner / outer joint portion 201) including part or all of the portion overlapping the absorber 56 and the width direction WD is defined as the non-stretchable region A1. The both sides in the width direction are taken as the stretchable area A2. The waist portion W is preferably the stretchable region A2 over the entire width direction WD, but similarly to the waist lower portion U, a non-stretchable region A1 may be provided in the middle in the width direction.

The stretchable region A2 and the non-stretchable region A1 supply the elastic stretchable members 15 to 17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, and the elastic

stretchable members

15, 16, 19 in the stretchable region A2. At least both ends in the stretching direction are fixed via a hot melt adhesive, not fixed in the region that becomes the non-stretchable region A1, but in the region that becomes the non-stretchable region A1, the elastic

stretchable members

15, 16, and 19 are intermediate in the width direction. In the non-stretchable region A1, the elastic

stretchable members

15, 16, and 19 are cut finely by pressurizing and heating to leave the stretchability in the stretchable region A2. Can be constructed by killing stretch. In the former case, as shown in FIG. 4, the non-stretchable region A1 is a state in which the uncut

elastic stretch members

15, 16 and 19 in the stretchable region A2 are continuously cut from the

elastic stretch members

15, 16, and 19 to the natural length as the unnecessary elastic stretch members In the latter case, although not shown, the remaining cutting portion continuous from the elastic

elastic members

15, 16, and 19 in the elastic region A2, and both of the elastic regions A2 are left. A cut piece of the elastic elastic member that is not continuous with the elastic

elastic members

15, 16, and 19 remains between the outer sheet layer 12S and the inner sheet layer 12H in a state where the cut piece of the elastic elastic member is contracted to the natural length alone as an unnecessary elastic elastic member.

In the exterior two-divided type pants-type disposable diaper, since the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200. The cover nonwoven fabric 20 covering the back surface of the interior body 200 is provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200. 14 and 15, when the outer sheet layer 12S of the exterior body 12 is a nonwoven fabric, the outer sheet layer 12S continues from the front body F to the back body B through the crotch, It becomes the cover nonwoven fabric 20 which covers the liquid-impermeable sheet 11.

The range in the front-rear direction of the cover nonwoven fabric 20 is not particularly limited as long as it has portions that overlap the front exterior body 12F and the rear exterior body 12B, as shown in FIGS. 2, 5, 7, 9, and 10. Furthermore, it may extend in the front-rear direction LD over the entire front end to rear end of the interior body 200, and as shown in FIG. 8, the front-rear direction intermediate position of the region where the front exterior body 12F and the interior body 200 overlap each other. The rear exterior body 12B and the interior body 200 may extend in the front-rear direction LD to the middle position in the front-rear direction. In the latter case, the longitudinal length 20y of the overlapping portion between the cover nonwoven fabric 20 and the front exterior body 12F and the longitudinal length 20y of the overlapping portion between the cover nonwoven fabric 20 and the rear exterior body 12B can be appropriately determined. In a normal case, the thickness can be about 20 to 40 mm.

The range in the width direction of the cover nonwoven fabric 20 is a range in which the exposed back surface of the liquid-impermeable sheet 11 can be hidden. For this reason, in the illustrated form, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right side gathers 60, the back side of the base end part of at least one side gather 60 to the other side gather 60. A cover nonwoven fabric 20 is provided so as to cover the range in the width direction up to the back side of the base end of the cover. Thereby, the liquid-impermeable sheet 11 can be concealed by the cover nonwoven fabric 20 and the gathered nonwoven fabric 62 of the side gathers 60, and the holes 14 at both ends in the width direction of the cover nonwoven fabric 20 are gathered nonwoven fabric 62 when viewed from the outer surface. It will never be hidden. Further, the cover nonwoven fabric 20 may be configured such that the both ends of the cover nonwoven fabric 20 in the width direction do not cover the back side of the base end portion of the side gather 60 but the gather nonwoven fabric 62 covers the back sides of both ends in the width direction of the cover nonwoven fabric 20. 20 and the gathered nonwoven fabric 62 can conceal the liquid-impermeable sheet 11. In this case, if the total light transmittance of the gathered nonwoven fabric 62 is 60 to 90%, the gathered nonwoven fabric 62 will cover the cover nonwoven fabric 20. Even in the hidden portion, the holes 14 of the perforated nonwoven fabric can be sufficiently seen through, so that it can be recognized that the portion having the function of improving air permeability extends to the side gathers 60, and the visual effect of the holes 14 is sufficient. Will be demonstrated.

<Example of tape-type disposable diapers>
FIGS. 16 to 20 show an example of a tape-type disposable diaper. In FIG. 16, symbol X indicates the full width of the diaper excluding the fastening tape, and symbol Y indicates the total length of the diaper. This tape-type disposable diaper includes an absorbent body 56 that extends from the abdominal side to the back side, a liquid-permeable top sheet 30 that covers the front side of the absorbent body 56, and a liquid-impermeable sheet 11 that covers the back side of the absorbent body 56. The ventral end flap portion EF and the dorsal end flap portion EF are portions that respectively extend to the front side and the rear side of the absorber 56 and do not have the absorber 56. And a pair of side flap portions SF extending laterally from the side edges of the absorber 56. In the middle of the side flap portion SF in the front-rear direction, a constriction is formed along the periphery of the leg, and a fastening tape 13 is provided on the back side of the constricted portion.

The back surface of the liquid-impermeable sheet 11 is covered with a cover nonwoven fabric 20. The cover nonwoven fabric 20 extends to the periphery of the diaper, the liquid-impermeable sheet 11 extends to the front and rear edges of the diaper in the front-rear direction, and the side edges of the absorbent body and the cover nonwoven fabric 20 in the width direction. However, the cover nonwoven fabric 20 can be only a part in the front-rear direction, only a part in the width direction, or both as needed. For example, when a part of the liquid-impermeable sheet 11 is covered with another material such as a gathered nonwoven fabric, the cover nonwoven fabric 20 may not be provided for that portion.

The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction and the width direction than the absorbent element 50, and protrude from the side edge of the absorbent element 50 in the top sheet 30. The peripheral edge part and the peripheral edge part which protruded from the side edge of the absorption element 50 in the liquid-impermeable sheet 11 are joined by a hot melt adhesive or the like.

Similarly to the case of the pants-type disposable diaper, the absorbent body 56 can be interposed between the top sheet and the liquid-impermeable sheet as an absorbent element wrapped by a packaging sheet, and an intermediate between the top sheet and the absorbent element. A sheet 40 can be provided. The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent element 50, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid. Further, as in the case of the pants-type disposable diaper, an indicator that changes color in contact with the liquid content of excrement can be provided.

The side gathers 60 are respectively provided on both sides in the width direction of the surface of the tape-type disposable diaper. Each side gather 60 includes a first portion 61 (planar gather portion) provided in each side flap portion SF and a second portion 69 (three-dimensional gather portion) protruding on both side portions of the top sheet 30. Is included. More specifically, a strip-shaped gathered nonwoven fabric 62 having a length equal to the total length Y of the diaper extends from the first portion 61 to the second portion 69, and the gathered nonwoven fabric 62 covers the first portion 61. Joined to the nonwoven fabric 20 with a hot melt adhesive or the like, and between these nonwoven fabrics, a gather elastic elastic member 63 along the front-rear direction LD is fixed in a stretched state with one or a plurality in the width direction WD at intervals. The first portion 61 contracts in the front-rear direction LD due to the contraction force, and becomes a flat gather that comes into contact with the legs. Further, the gathered non-woven fabric 62 has an extending portion extending from the first portion 61 as a root portion to the center in the width direction WD, and at least the extending portion is folded at the tip to form a two-layer structure. Has been. Both end portions in the front-rear direction LD in the extending portion are set as the lying portions 67 fixed to the top sheet 30, while the intermediate portion in the front-rear direction LD positioned therebetween is set as a non-fixed free portion 68. One or more gather elastic elastic members 63 along the front-rear direction LD are fixed to the free portion 68 in a stretched state with a gap in the width direction WD, and the free portion of the second portion 69 is contracted by the contraction force. 68 is a three-dimensional gather that contracts in the front-rear direction LD and touches around the legs.

The fastening tape 13 in the illustrated embodiment includes a tape base portion 13C which forms a tape mounting portion 13C fixed to the side portion of the diaper, a tape main body portion 13B protruding from the tape mounting portion 13C, and a tape main body portion 13B in the sheet base material. There is a locking portion 13A for the abdominal side provided at the intermediate portion in the width direction, and the tip side is a knob portion from this locking portion 13A. The tape attachment portion 13C of the fastening tape 13 is sandwiched between the gathered nonwoven fabric 62 forming the inner layer and the cover nonwoven fabric 20 forming the outer layer in the side flap portion, and is bonded to both

sheets

62 and 12 by a hot melt adhesive. . Further, the locking portion 13A is joined to the inner surface of the tape main body portion 13B with an adhesive.

As the locking portion 13A, a hook material (male material) of a mechanical fastener (surface fastener) is suitable. The hook material has a large number of engaging projections on the outer surface side thereof. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. Of course, an adhesive layer can also be provided as a locking portion of the fastening tape 13.

Further, as the sheet base material that forms the tape mounting portion 13C to the tape main body portion 13B, a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper, or a composite material thereof can be used.

When installing the diaper, the fastening tape 13 is locked at a suitable position on the outer surface of the ventral side with the back side flap portion SF overlapped with the outer side of the ventral side flap portion SF. The position and size of the fastening portion of the fastening tape 13 can be arbitrarily determined.

It is preferable to provide a target sheet 24 having a target for facilitating locking at the locking position of the fastening tape 13 on the ventral side. When the locking portion 13A is a hook material, the target sheet 24 is a film type having a film layer and an engagement layer provided on the entire outer surface of the locking portion 13A so that the hook of the locking portion 13A is detachably engaged. A thing can be used suitably. In this case, as the engagement layer, a non-woven fabric layer of thermoplastic resin is formed by intermittent ultrasonic sealing in addition to a form in which a net-like body knitted with yarn and having a loop is attached on a film layer. Although the form which is attached on a film layer and the fiber of a nonwoven fabric makes a loop is known, all can be used conveniently. Further, a filmless type target tape having a film layer without embossing a thermoplastic resin nonwoven fabric can also be used. In these target tapes, the fastening tape 13 is coupled by the hook of the fastening tape 13 being entangled or caught in the loop.

In the case where the locking portion 13A is an adhesive material layer, the surface of a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness can be used.

Further, when the fastening portion of the fastening tape 13 on the ventral side is made of a nonwoven fabric, for example, when the cover nonwoven fabric 20 of the illustrated form is made of a nonwoven fabric, and the locking portion 13A of the fastening tape 13 is a hook material, The target sheet 24 may be omitted, and the hook material may be entangled with the nonwoven fabric of the cover nonwoven fabric 20 and locked. In this case, the target sheet 24 may be provided between the cover nonwoven fabric 20 and the liquid-impermeable sheet 11.

The end flap portion EF is a portion that extends to the front side and the rear side of the absorbent main body 10 and does not have the absorbent element 50, and the front extension portion is the ventral end flap portion EF. The rear extended portion is the back end flap portion EF.
The length in the front-rear direction of the back end flap EF is preferably the same or shorter than the length in the front-rear direction of the attachment portion of the fastening tape 13 for the above-mentioned reasons. Is excessively close, the gap between the dorsal side of the diaper and the body surface is likely to be generated due to the thickness and stiffness of the absorbent element 50, so that the thickness is preferably 10 mm or more.
The length in the front-rear direction of the ventral end flap portion EF and the back end flap portion EF is preferably about 5 to 20% of the length L in the front-rear direction of the entire diaper. It is appropriate that the thickness is 60 mm, particularly 20 to 50 mm.

In order to improve the fit of the back side of the diaper, it is preferable that a belt-like back side elastic sheet 70 that elastically expands and contracts in the width direction is provided between both fastening tapes 13 as shown in the figure. Both end portions of the back-side elastic sheet 70 are preferably extended to a portion that overlaps with the attachment portions of both fastening tapes 13, but may be separated to the center in the width direction. It is preferable that the front-rear dimension of the back-side stretchable sheet 70 is within a range of about plus or minus 20% with respect to the front-rear dimension of the attachment portion of the fastening tape 13. In addition, when the back elastic sheet 70 is disposed so as to overlap the boundary line between the back end flap portion EF and the absorbent element 50 as shown in the drawing, the back side end of the absorbent element 50 is firmly pressed against the body. Because it is applied, it is preferable. The back-side elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but it is preferable to use a nonwoven fabric or paper from the viewpoint of air permeability. In this case, a sheet-like elastic member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIG. Attached with an adhesive, and fixed between the two sheet base materials 71 in a stretched state along the width direction with a perforated sheet-like, net-like, elongated shape (thread-like or string-like) etc. Are preferably used. The elongation rate of the elastic elastic member 72 is preferably about 150 to 250%. Further, when an elongated member (thread-like or string-like) is used as the elastic elastic member 72, it is preferable to provide about 5 to 15 members with a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.

In addition, it is preferable that a part of the elastic expansion / contraction member 72 is arranged so as to cross the absorbent element 50 as shown in the figure because the fitting property of the absorption element 50 is improved. If the contraction force is prevented from acting on a part or all of the overlapping portion by means such as cutting, the back end of the absorbent element 50 does not contract in the width direction, so that the fit is further improved.

The elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent the sheet from shrinking or curling when attached to the diaper body, In the range of about 5 to 20 mm at the end in the front-rear direction (diaper width direction), it is preferable that the contraction force does not work or the elastic elastic member 72 does not exist.
In the illustrated embodiment, the back-side stretchable sheet 70 is sandwiched between the gathered nonwoven fabric 62 and the cover nonwoven fabric 20 on both sides in the width direction of the liquid-impermeable sheet 11, and is liquid-impermeable at a portion overlapping the liquid-impermeable sheet 11. Although provided so that it may be pinched | interposed between the permeable sheet 11 and the absorption element 50, you may provide between the liquid-impermeable sheet 11 and the cover nonwoven fabric 20, and it provides in the outer surface of the cover nonwoven fabric 20. Alternatively, it may be provided between the top sheet 30 and the absorbent element 50. Further, the back-side elastic sheet 70 may be provided on the top sheet 30. In this case, the back-side elastic sheet 70 may be provided on the gathered nonwoven fabric 62 on both sides in the width direction of the liquid-impermeable sheet 11. Further, when the cover nonwoven fabric 20 is formed by stacking a plurality of sheet base materials, the entire back elastic sheet 70 may be provided between the sheet base materials of the cover nonwoven fabric 20.

<Cover nonwoven fabric>
The cover nonwoven fabric 20 covers the back side of the liquid-impermeable sheet 11 and forms a product outer surface in at least a part of the portion covering the liquid-impermeable sheet 11. Characteristically, the cover nonwoven fabric 20 is a perforated nonwoven fabric in which a large number of holes 14 penetrating the front and back surfaces are provided at intervals. The type of fiber of the cover nonwoven fabric 20 and the processing method of fiber bonding (entanglement) are not particularly limited, but it is preferable to use an air-through nonwoven fabric, in which case the basis weight is 20 to 30 g / m ² and the thickness is 0.3 to It is preferable that it is 1.0 mm.

Moreover, in the above-mentioned exterior two-divided type pants-type disposable diaper, the side edge of the cover nonwoven fabric 20 is the narrowest part of the absorbent body 56 (the full width when there is no constricted part 56N. When the constricted part 56N is provided. Is the same as the side edge of the narrow part in the constricted portion 56N) or the width of the cover nonwoven fabric 20 is overlapped with the absorbent body 56, that is, the rigidity is high. Since the cover nonwoven fabric 20 is located only in the portion where wrinkles and breakage are unlikely to occur, both sides of the cover nonwoven fabric 20 are less likely to shrink in the front-rear direction LD, and wrinkles are formed on both sides of the cover nonwoven fabric 20 14 crushing is difficult to occur.

The cover nonwoven fabric 20 desirably has the holes 14 extending in the front-rear direction in consideration of the air permeability improvement effect, but may have a region without the holes 14 in a part of the front-rear direction LD. On the other hand, in the width direction WD, it is preferable that the hole 14 is provided over the entire cover nonwoven fabric 20. That is, in the form having areas without the holes 14 at both ends in the width direction WD of the cover nonwoven fabric 20, when the holes 14 are opened by a method other than punching with a cutter, as will be described later, When the fiber is retracted outward or in the vertical direction, the peripheral portion 14e of the hole 14 warps and the thickness of the perforated region becomes thicker than that of the non-porous region. This part is in a loosely wound state, and wrinkles and folds may be formed in the non-porous regions on both sides. Therefore, it is desirable that the hole 14 is formed over the entire width direction WD as illustrated.

For example, in the above-described exterior-integrated pants-type disposable diaper, as shown in FIG. 14, the hole 14 can be formed only in the front-rear direction intermediate region of the cover nonwoven fabric 20 that does not have the elastic elastic members 15-18. . On the other hand, in the above-described tape-type disposable diaper, as shown in FIG. Moreover, in the above-mentioned exterior two-divided pants-type disposable diaper, as shown in FIG. 2 and FIG. It is desirable to extend to the overlapping part.

The planar shape (opening shape) of each hole 14 can be determined as appropriate, and has a long hole shape as shown in FIGS. 21 (a) and 21 (b), as shown in FIGS. 21 (c) and 21 (e). It can be an arbitrary shape such as a perfect circle, an ellipse as shown in FIG. 21D, a polygon such as a triangle, a rectangle or a rhombus, a star or a cloud. The size of each hole 14 is not particularly limited, but the maximum dimension 14L in the front-rear direction LD is preferably 0.3 to 1.8 mm, particularly 0.4 to 1.0 mm, and the maximum dimension 14W in the width direction WD is The thickness is preferably 0.2 to 1.5 mm, particularly preferably 0.3 to 1.0 mm. When the shape of the hole 14 is a long shape in one direction such as a long hole shape, an ellipse shape, a rectangular shape, a rhombus shape, etc. (a shape in which the total length in one direction is longer than the total length in the direction perpendicular to this), the maximum in the longitudinal direction The dimension is preferably 1.2 to 2.5 times the maximum dimension in the direction perpendicular thereto. Moreover, when the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.

The area and area ratio of each hole 14 may be determined as appropriate, but the area is preferably about 0.1 to 2.7 mm ² (particularly 0.1 to 1.0 mm ² ). It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).

Although the plane arrangement of the holes 14 can be determined as appropriate, a plane arrangement that is regularly repeated is preferable, and is an orthorhombic lattice shape as shown in FIG. 21A or a hexagonal lattice shape as shown in FIG. (These are also referred to as a staggered pattern.), A square grid pattern as shown in FIG. 21 (c), a rectangular grid pattern as shown in FIG. 21 (d), and a parallel grid as shown in FIG. 21 (e). Thus, a configuration in which two groups are arranged so that a large number of parallel diagonal rows intersect each other) (including those inclined at an angle of less than 90 degrees with respect to the front-rear direction LD) In addition to what is regularly repeated, the group of holes 14 (group unit arrangement may be regular or irregular, and may be a pattern, a character, or the like) may be regularly repeated.

The interval 14y in the front-rear direction and the interval 14x in the width direction of the holes 14 can be determined as appropriate. However, considering air permeability, 14y is 0.9 to 8.0 mm, 14x is 2.0 to 10 mm, and 14y is 1. Desirably, 0 to 3.0 mm and 14x are within a range of 3.0 to 5.0 mm. In particular, as shown in FIG. 21 (d), a row of holes 14 arranged in the front-rear direction with a front-rear direction interval 14y narrower than the maximum dimension 14L in the front-rear direction of the holes 14 is repeated at a predetermined interval in the width direction WD, and While the width-direction interval 14x is wider than the maximum dimension 14L in the front-rear direction of the hole 14 (and more preferably 3 times or more the width-direction dimension 14W of the hole 14), the air permeability is significantly improved. The softness and bulkiness are not impaired, and the tensile strength of the sheet in the front-rear direction, which is important at the time of production, is not reduced, which is preferable. Particularly in this case, the shape of the hole 14 is preferably elongated in the front-rear direction LD.

As shown in FIG. 22, the cross-sectional shape of the hole 14 is such that the thickness of the nonwoven fabric decreases from the periphery of the hole 14 toward the edge of the hole 14, and the edge of the hole 14 is located in the middle of the thickness direction of the nonwoven fabric. One embodiment, a second embodiment in which the peripheral portion 14e of the hole 14 is warped to the front side as shown in FIG. 23, and the height 14h of the warp is substantially uniform, and a peripheral portion of the hole 14 as shown in FIG. 14e is warped to the front side, and the peripheral portion 14e of the hole 14 is a facing portion having the highest warped height 14i and a facing portion facing in a direction orthogonal thereto, and the warped height 14j is the lowest. Any of the high third forms having a portion may be used. From the viewpoint of air permeability, the second form and the third form in which the part having the hole 14 is thicker than the surroundings are desirable. In particular, the third form is the difference between the

warped heights

14i and 14j of the peripheral part 14e of the hole 14. The gap formed by is preferable because it contributes to improved air permeability. In the second and third embodiments, the

warped heights

14g, 14h, and 14i (apparent height when no pressure is measured using an optical microscope) is about 0.2 to 1.2 mm. In the third embodiment, the highest warped height 14i is preferably about 1.1 to 1.4 times the lowest warped height 14j.

Even if the hole 14 is a punched hole 14 whose edge is formed by a cut end of the fiber, there is almost no cut end of the fiber in the peripheral portion 14e of the hole 14, and a pin is inserted between the fibers to be expanded. The non-punched hole 14 (the fiber density of the edge portion is high) formed in this manner may be used. The former is suitable for the first embodiment, and the latter is suitable for the second and third embodiments. For example, when the hole 14 having a shape elongated in one direction is formed by inserting a pin, the fibers in the peripheral portion 14e of the hole 14 are retracted outward or in the vertical direction, and the peripheral portion 14e of the hole 14 is warped and the length of the hole 14 is increased. The warped height i of the facing portion in the direction becomes higher than the warped height j of the facing portion in the direction orthogonal to the longitudinal direction. In the second and third embodiments, the edge of the portion where the peripheral portion 14e of the hole 14 is warped to the surface may have a fiber density lower than that of the peripheral portion, but it is the same or higher. Preferably it is. Moreover, although it is desirable that the fibers in the peripheral portion 14e of the hole 14 are fused, the fibers may not be fused.

The cover nonwoven fabric 20 is bonded to the liquid-impermeable sheet 11 (corresponding to the support sheet of the present invention) via a hot-melt adhesive 20H in the bonding region over almost the entire area. The bonded region of the cover nonwoven fabric 20 may be the entire front-rear direction and the entire width direction of the cover nonwoven fabric 20, or a part thereof may be a non-bonded region. For example, in the pants type disposable diaper of the aforementioned exterior two-divided type, if both ends in the width direction of the cover nonwoven fabric 20 are non-adhesive regions, the side of the absorbent body 56 is somewhat contracted due to the influence of the side gathers 60. This is advantageous in that the cover nonwoven fabric 20 is less likely to be affected and creases and folds are less likely to be formed. In this case, the width of the non-adhesive portions at both ends in the width direction of the cover nonwoven fabric 20 may be determined as appropriate, and may be, for example, 3 to 10 mm, preferably 5 to 8 mm.

Characteristically, as shown in FIG. 11, there is no hot melt adhesive 20H on the center side of the peripheral portion 14i of the region overlapping the hole 14 in the adhesive region between the cover nonwoven fabric 20 and the liquid-impermeable sheet 11. The hot melt adhesive 20H is present in a continuous surface shape except for the peripheral edge portion 14i in the region overlapping with the hole 14. Since there is no hot melt adhesive 20H on the center side of the peripheral edge portion 14i in the region overlapping with the hole 14, the hot melt adhesive 20H is less likely to feel sticky, and the peripheral portion 14e of the hole 14 is the liquid-impermeable sheet 11. It is securely fixed to.

As a typical adhesion state, as shown in FIGS. 11A and 11B, the hot melt adhesive 20 H is not present in the region overlapping the hole 14, and the hot melt adhesive 20 H is continuous in the region other than the region overlapping the hole 14. As shown in FIGS. 11 (c) and 11 (d), the hot melt adhesive 20 H protrudes from the peripheral edge portion 14 i of the region overlapping the hole 14, but the peripheral edge of the region overlapping the hole 14. The hot melt adhesive 20H is not present at the center side of the portion 14i, and the hot melt adhesive 20H is present in a continuous surface shape other than the peripheral portion 14i in the region overlapping the hole 14. The former state is a particularly desirable state, but the peripheral edge portion 14i of the region overlapping with the hole 14 is a portion adjacent to the peripheral portion 14e of the hole 14, and the cover nonwoven fabric 20 has a certain thickness. Even if the hot melt adhesive 20H protrudes from this portion, the hot melt adhesive 20H is hardly touched directly when the surface of the cover nonwoven fabric 20 opposite to the liquid-impermeable sheet 11 is touched by hand. The protruding width of the hot melt adhesive 20H at the peripheral edge portion 14i in the region overlapping with the hole 14 is preferably half or less of the thickness of the cover nonwoven fabric 20 and about 0.5 mm or less. Further, it is desirable that the hot melt adhesive 20H does not exist in a portion of 80% or more of the area of the region overlapping with the hole 14.

The cross-sectional shape of the hole 14 in the cover nonwoven fabric 20 is not limited. However, if the peripheral portion 14e of the hole 14 is a warped portion that is warped toward the liquid-impermeable sheet 11 as described above, the liquid-impermeable state is obtained. When the hole diameter seen from the liquid-impermeable sheet 11 side is small compared to the hole diameter seen from the surface opposite to the liquid-impermeable sheet 11 side, and the surface opposite to the liquid-impermeable sheet 11 side is touched by hand It becomes difficult to touch the hot melt adhesive 20H. In addition, since the warped portion supports the cover nonwoven fabric 20 with respect to the liquid-impermeable sheet 11 like a support column, the warped portion becomes bulky and excellent in air permeability as compared with a non-porous nonwoven fabric having the same basis weight. Further, in the region other than the peripheral portion 14e of the hole 14, the adhesion between the cover nonwoven fabric 20 and the liquid-impermeable sheet 11 is likely to float (in FIG. 11, the hot melt adhesive 20H seems to fill the space between the sheets without any gaps). Although the actual coating amount is small and a gap is easily formed), the peripheral portion 14e of the hole 14 is securely bonded, and incomplete bonding is performed in other regions (substantially small bonding area is small). This makes it possible to obtain excellent softness and softness.

The characteristic adhesion structure described above can be manufactured by the equipment shown in FIG. 25, for example. That is, this perforated nonwoven fabric affixing equipment unwinds a continuous support sheet 160 in a belt shape from a raw roll (not shown) and transfers it along its continuous direction, while delivering a perforated nonwoven fabric 151 continuous in a belt shape, After the hot melt adhesive 20H is applied to the bonding area by a hot melt applicator (hot melt adhesive coating apparatus) 170, the application surface of the hot melt adhesive 20H is superimposed on the support sheet 160 and pressed by the press roll 140. Adhere. The illustrated example assumes a manufacturing facility in which the perforated nonwoven fabric 151 becomes the above-described cover nonwoven fabric 20 and the support sheet 160 becomes the above-mentioned liquid-impermeable sheet 11, and is supported by the hot melt applicator 171 for fixing the absorbent element. After the hot melt adhesive 20H for the absorbent element 50 is applied to the upper surface of the sheet 160, the absorbent elements 50 are sequentially supplied and bonded at intervals in the MD direction, and then the perforated nonwoven fabric 151 is attached to the opposite surface of the support sheet 160. Although it adhere | attaches, it is not limited to this, Only the adhesion process of the perforated nonwoven fabric 151 and the support sheet 160 is applicable to another use. In addition, the perforated nonwoven fabric 151 may be supplied by feeding the perforated nonwoven fabric 151 from the raw roll, or after supplying a non-perforated nonwoven fabric having no holes 14 and performing perforation processing in-line. Alternatively, the hot melt adhesive 20H may be applied and bonded to the support sheet 160.

Characteristically, when the hot melt adhesive 20H is applied to the perforated nonwoven fabric 151, the hot melt adhesive 20H is applied to the continuous surface of the perforated nonwoven fabric 151 on the support sheet 160 side surface without using air. After the application, the perforated nonwoven fabric 151 coated with the hot melt adhesive 20H is adhered to the support sheet 160 that is not coated with the hot melt adhesive 20H on the surface of the perforated nonwoven fabric 151. When such an adhesion method is employed, as indicated by an arrow in FIG. 26, the hot melt adhesive 20 H is applied to the perforated nonwoven fabric 151 in a continuous surface shape and then bonded to the support sheet 160 before the hot melt adhesive is bonded. Due to the surface tension of the adhesive 20H, a mouth (hole) h is opened in the center of the portion of the hot melt adhesive 20H that overlaps the hole 14 of the perforated nonwoven fabric 151, and the opening h is a peripheral portion 14e of the hole 14 of the perforated nonwoven fabric 151. Expand to. Therefore, after bonding the perforated nonwoven fabric 151 to the support sheet 160, as shown in the example shown in FIG. 11, most of the holes 14 do not have the hot melt adhesive 20H, and hot melt adhesion from the holes 14 by air is performed. Since the agent 20H does not come off or ooze out, it becomes difficult to feel sticky when the surface opposite to the support sheet 160 is touched by hand. Moreover, since a hot melt adhesive generally has better adhesion to a plastic film than a non-woven fabric, a high bonding strength can be obtained by applying the adhesive to the non-woven fabric side in this way. Further, since the hot melt adhesive 20H overlapping the hole 14 moves to the peripheral portion 14e of the hole 14 due to surface tension, and the density of the hot melt adhesive 20H in the peripheral portion 14e of the hole 14 increases, the peripheral portion 14e of the hole 14 is increased. Is firmly fixed to the support sheet 160.

As the hot melt applicator 170 for applying the hot melt adhesive in a continuous surface shape without using air, the coating head (die) was brought into contact with the adhesive surface of the perforated nonwoven fabric and provided at the tip of the coating head. CD direction provided at the tip of the coating head in the state where the coating head (die) is lifted from the adhesive surface of the slot coat or perforated nonwoven fabric which is applied by extruding the hot melt adhesive from the slit along the CD direction A non-contact type slot coat that extrudes a hot melt adhesive from a slit along the surface and stretches the hot melt adhesive according to the difference from the transfer speed of the perforated nonwoven fabric and applies it to an ultrathin film can be suitably used. .

The bonding conditions can be determined as appropriate. In order to quickly move the hot melt adhesive 20H overlapping the hole 14 to the peripheral part 14e of the hole 14 and firmly bond the peripheral part 14e of the hole 14, the following conditions are satisfied. It is desirable to satisfy at least one of the following.
Hot melt adhesive melt viscosity (temperature 140 ° C.): 3,000-2,600 mPa · s
Hot melt adhesive melt viscosity (temperature 160 ° C.): 1,150 to 1,550 mPa · s
Temperature during application of hot melt adhesive to porous nonwoven fabric: 110 to 150 ° C
Application amount of hot melt adhesive to porous nonwoven fabric: 1.0 to 8.0 g / m ²
Open time after application of hot melt adhesive: 0.1 to 1.0 seconds

On the other hand, in the pants type disposable diaper of the aforementioned exterior two-divided type, the total light transmittance of the portion not having the elastic elastic member in the portion overlapping at least the cover nonwoven fabric 20 of the outer package 12 is 50% or more (preferably 65% or more ), The hole 14 of the perforated nonwoven fabric is sufficiently visible through the portion of the cover nonwoven fabric 20 that is hidden behind the front exterior body 12F and the rear exterior body 12B. This is preferable because it can be recognized not only between the exterior body 12F and the rear exterior body 12B but also to both the front and rear sides thereof, and the visual effect of the holes 14 is sufficiently exhibited. The total light transmittance of the outer package 12 is measured in a state where the outer sheet layer 12S and the inner sheet layer 12H are overlapped.

Further, as shown in FIGS. 9 and 10, at least one of the front exterior body 12 F and the rear exterior body 12 B is the width of the interior body 200 as shown in FIGS. In the region that overlaps both ends in the direction, it is joined to the interior body 200, and in the region between the regions that overlap both ends in the width direction of the interior body 200, a part of the crotch side or the entire front-rear direction LD is not bonded. Alternatively, it is a preferred form that it is intermittently and peelably bonded. In this case, the gap between the interior body 200 and the exterior body 12 leads to the crotch side and air permeability is improved. Moreover, since the perforated cover nonwoven fabric 20 hidden by the exterior body 12 can be seen directly by rolling this portion, the visual effect of the holes 14 is further improved.

<Others>
In the above example, the cover nonwoven fabric 20 that covers the back side of the liquid-impermeable sheet 11 is a perforated nonwoven fabric, and the present invention is applied to the adhesive structure between the perforated nonwoven fabric and the liquid-impermeable sheet 11. It is needless to say that the non-woven fabric component other than the non-woven fabric 20 is made of a porous non-woven fabric, and the adhesive structure and bonding method of the present invention can be applied. The top sheet 30 is a porous non-woven fabric and the intermediate sheet 40 is a support sheet. It is also a preferable example to apply to the adhesive structure of the sheet on the surface side.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

· “Front and back (vertical) direction” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left and right direction) orthogonal to the front and rear direction.

・ "Front side" means the person near the wearer's skin when wearing a pants-type disposable diaper, and "Back" means the person far from the wearer's skin when wearing a pants-type disposable diaper .

・ "Surface" means the surface closer to the wearer's skin when wearing a pants-type disposable diaper, and "Back" refers to the skin of the wearer when wearing a pants-type disposable diaper. It means the far side.

• “Total light transmittance” means a value measured according to JIS-K7105.

・ "Area ratio" means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (for example, holes) in the target region (for example, cover nonwoven fabric) by the area of the target region. It is. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio. For example, the area ratio of the holes can be measured by the following procedure using, for example, a trade name VHX-1000 of KEYENCE Corporation, with the measurement condition set to 20 times.
(1) Set on a 20x lens and adjust the focus. The position of the nonwoven fabric is adjusted so that the holes are 4 × 6.
(2) Specify the brightness of the hole area and measure the area of the hole.
(3) Click the “Area measurement” color extraction in “Measurement / Comments”. Click on the hole.
(4) Click “Batch measurement”, check “Display measurement result window”, and save as CSV data.

・ "Elongation rate" means a value when the natural length is 100%.

・ "Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt% 1.0 g of a superabsorbent polymer is added to 49.0 g of the mixture) and stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

· “Weighing” is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. Using a specimen template (200 mm × 250 mm, ± 2 mm) from the test piece in a constant weight state, a sample having a size of 200 mm × 250 mm (± 2 mm) is cut out. Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.

“Thickness” is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 10 gf / cm ² and pressure area: 2 cm ² .

・ Water absorption is measured according to JIS K7223-1996 “Test method for water absorption of superabsorbent resin”.

-The water absorption rate is the "time to end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

・ "Unfolded state" means a state of being flattened without contraction or slack.

-Unless otherwise specified, the dimensions of each part mean dimensions in the expanded state, not the natural length state.

· "Melt viscosity" is measured at a specified temperature using a Brookfield B-type viscometer (spindle No. 027) according to JIS Z 8803.

・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .

The present invention can be used for general disposable wearing articles such as pants-type disposable diapers and tape-type disposable diapers, pad-type disposable diapers, disposable swimwear, diaper covers, sanitary napkins and the like.

DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet layer, 20 ... Cover nonwoven fabric, 20H DESCRIPTION OF SYMBOLS ... Hot melt adhesive, 14 ... Hole, 14e ... Peripheral part, 14i ... Peripheral part, 18 ... Unnecessary elastic elastic member, 200 ... Interior body, 201 ... Inner / outer joint part, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... absorber, 58 ... packaging sheet, 60 ... side gather, 62 ... gathered nonwoven fabric, 140 ... press roll, 151 ... perforated nonwoven fabric, 160 ... support sheet, 170 ... hot melt applicator, A1 ... non Stretching area, A2 ... Stretching area, C ... Buttocks cover part, L ... Middle area, LD ... Front-back direction, LO ... Leg opening, T ... Trunk area, U ... Waist lower part, W ... Waist , WD ... width direction, WO ... waist-opening.

Claims

It comprises a perforated nonwoven fabric provided with a large number of holes penetrating on the front and back sides, and a support sheet on which the perforated nonwoven fabric is laminated, and the perforated nonwoven fabric and the support sheet are in a predetermined adhesion region. A disposable wearing article bonded via a hot melt adhesive,
Among the bonding regions, the hot melt adhesive is not present at the center side of the peripheral portion of the region overlapping with the hole, and the hot melt adhesive is present in a continuous surface shape other than the peripheral portion of the region overlapping with the hole. Yes,
A disposable wearing article characterized by the above.
The disposable wear according to claim 1, wherein the hot melt adhesive is not present in a region overlapping the hole in the adhesive region, and the hot melt adhesive is present in a continuous surface shape in a region other than the region overlapping the hole. Goods.
The disposable wearing article according to claim 1 or 2, wherein a peripheral portion of the hole in the perforated nonwoven fabric is a warped portion that warps toward the support sheet.
An absorbent article comprising an absorbent body, a liquid-impermeable sheet having air permeability covering the back side of the absorbent body, and a cover nonwoven fabric covering the back side of the liquid-impermeable sheet,
The cover nonwoven fabric is the perforated nonwoven fabric, and the liquid-impermeable sheet is the support sheet.
The disposable wearing article according to any one of claims 1 to 3.
In a method for attaching a perforated nonwoven fabric, a porous nonwoven fabric provided with a large number of holes penetrating the front and back sides and a support sheet are laminated and bonded via a hot melt adhesive in a predetermined adhesion region. ,
After applying the hot melt adhesive in a continuous surface shape without using air, in the adhesion region of the surface on the support sheet side in the perforated nonwoven fabric,
The porous nonwoven fabric coated with the hot melt adhesive is bonded to the support sheet not coated with the hot melt adhesive on the surface of the porous nonwoven fabric,
A method for attaching a perforated nonwoven fabric characterized by the above.
The hot melt adhesive has a melt viscosity of 3,000 to 2,600 mPa · s at a temperature of 140 ° C. and a melt viscosity of 1,150 to 1,550 mPa · s at a temperature of 160 ° C.,
The temperature at the time of application of the hot melt adhesive to the perforated nonwoven fabric is 110 to 150 ° C.,
The amount of the hot melt adhesive applied to the perforated nonwoven fabric is 1.0 to 8.0 g / m 2 ,
The open time after application of the hot melt adhesive to the porous nonwoven fabric is 0.1 to 1.0 seconds,
The method for attaching a porous nonwoven fabric according to claim 5.