TWI738875B - Disposable wearing articles and pasting method of perforated non-woven fabric - Google Patents

Abstract

The problem to be solved by the present invention is to prevent the skin from becoming sticky due to the hot-melt adhesive, and to securely fix the periphery of the hole to the support sheet. In order to solve the above-mentioned problems, the present invention is a disposable wearing article comprising a non-woven mask 20 and a liquid-impermeable sheet 11. The non-woven mask 20 is provided with a plurality of holes 14 penetrating the front and back at intervals. The mask non-woven fabric 20 is laminated on the liquid-impermeable sheet 11, wherein the mask non-woven fabric 20 and the liquid-impermeable sheet 11 are bonded by a hot-melt adhesive 20H in a predetermined bonding area, and, in the bonding area, There is no hot-melt adhesive 20H at the center side than the peripheral portion 14i of the area overlapping with the hole 14, and there is continuous surface heat in the area other than the peripheral portion 14i of the area overlapping with the hole 14 Fusion bonding agent 20H.

Description

Disposable wearing articles and pasting method of perforated non-woven fabric

The present invention relates to a disposable wearing article and a method for sticking a perforated nonwoven fabric. The disposable wearing article has a part where the perforated nonwoven fabric is stuck.

In most disposable diapers or sanitary napkins and other disposable wearing articles, in order to prevent the permeation of absorbent liquid and ensure air permeability, an air-permeable liquid-impermeable sheet is provided on the back side of the absorbent body, and for the purpose of making With a cloth-like appearance and skin touch, the back of the liquid-impermeable sheet is covered with a masking non-woven fabric.

In this case, if the mask non-woven fabric is laminated on the air-permeable liquid-impermeable sheet, the air permeability will be correspondingly lowered due to the presence of the mask non-woven fabric. A better way to solve this problem is to use a perforated non-woven fabric as a masking non-woven fabric, which has a plurality of holes penetrating the front and back surfaces (refer to Patent Documents 1 and 2).

However, when the porous nonwoven fabric is adhered to a support sheet such as a liquid-impermeable sheet by a hot-melt adhesive, if the hot-melt adhesive is applied to the position that overlaps the hole (for example, refer to Patent Document 3), there will be The following doubts: The hot melt adhesive oozes through the holes or is exposed to the outer surface of the porous non-woven fabric, and adheres to the manufacturing equipment or becomes sticky to the skin. However, if the hot-melt adhesive is not applied in the vicinity of the hole, there is a concern that the periphery of the hole is not fixed and the periphery of the hole floats, which deteriorates the aesthetics and the touch of the skin. In addition, in the case of applying hot-melt adhesive to the support sheet, the hot-melt adhesive must be present at the position overlapping with the hole; on the contrary, in the case of applying hot-melt adhesive to the porous non-woven fabric, especially if it is used The method of spraying with air will cause the hot melt adhesive to leak or ooze from the hole at this time. However, if the application method such as slit coating without air is adopted, the hot melt adhesive becomes It also exists in a position that overlaps the hole, so it is considered unusable. [Prior Art Document] (Patent Document)

Patent Document 1: Japanese Patent Application Publication No. 2015-128573 Patent Document 2: Japanese Patent Application Publication No. 2002-178428 Patent Document 3: Japanese Patent Application Publication No. 2009-136504

[Problem to be Solved by the Invention] Therefore, the main problem to be solved by the present invention is to prevent the skin from becoming sticky due to the hot-melt adhesive and to securely fix the periphery of the hole to the support sheet. [Technical means to solve the problem]

A representative aspect of the present invention that solves the above-mentioned problems is as follows. <First aspect> A disposable wearing article comprising a perforated nonwoven fabric and a support sheet, the perforated nonwoven fabric is provided with a plurality of holes penetrating the front and back at intervals, and the perforated nonwoven fabric is laminated on the support sheet And the aforementioned perforated non-woven fabric and the aforementioned supporting sheet are adhered by a hot-melt adhesive in a predetermined adhesion area. The hot-melt adhesive does not exist in the portion further to the center, and the hot-melt adhesive is present in a continuous plane in regions other than the peripheral edge of the region overlapping with the hole.

(Effects) If there is such an adhesive structure, there is no hot-melt adhesive at the center side than the peripheral edge of the area overlapping with the hole, so the hot-melt adhesive will not make the skin feel sticky. , And it is possible to securely fix the periphery of the hole to the support piece. In addition, the peripheral edge of the area overlapping with the hole is the part close to the peripheral edge of the hole. Therefore, even if the hot melt adhesive oozes out to this part, it is almost impossible to touch the surface on the opposite side of the support sheet side of the perforated nonwoven fabric with your hands. Touch the hot melt adhesive directly.

<Second aspect> The disposable wearing article according to the first aspect, in which the hot melt adhesive does not exist in the region overlapping the hole in the adhesive region, but is outside the region overlapping the hole There is the aforementioned hot-melt adhesive in the form of a continuous surface in the area of.

(Effects) It is desirable that the hot-melt adhesive does not exist in the area overlapping with the hole, including the peripheral edge.

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

(Effects) If the perforated nonwoven fabric has such a warped portion around the hole, the hole seen from the side of the self-supporting sheet is smaller than the hole on the opposite side from the side of the self-supporting sheet. It is difficult to touch the hot-melt adhesive when touching the surface on the opposite side of the support sheet with your hands. In addition, the warped portion supports the perforated nonwoven fabric with respect to the support sheet like a pillar, and therefore, it is bulky compared to a nonporous nonwoven fabric of the same basis weight and has excellent air permeability. Furthermore, in areas other than the periphery of the hole, the adhesion between the perforated nonwoven fabric and the support sheet tends to float, so the periphery of the hole is surely bonded, and the other area becomes incomplete adhesion (substantial adhesion area) Smaller), by which excellent softness and lightness can be obtained.

<Fourth aspect> The disposable wearing article of any one of the first to third aspects, wherein the disposable wearing article is an absorbent article, and includes: an absorber; a liquid-impermeable sheet, It covers the back side of the absorbent body and is breathable; and, the mask non-woven fabric covers the back side of the liquid-impermeable sheet; and the mask non-woven fabric is the aforementioned perforated non-woven fabric, and the aforementioned liquid-impermeable sheet is the aforementioned Support piece.

(Effects) In absorbent articles, an air-permeable liquid-impermeable sheet is generally used to cover the back of the absorbent body, and a mask non-woven fabric is further used to cover the outer surface of the liquid-impermeable sheet to form a cloth like cloth From the viewpoint of improving air permeability, not only the air permeability of the liquid-impermeable sheet, but also the air permeability in the thickness direction of the mask non-woven fabric or the air permeability between the mask non-woven fabric and the liquid-impermeable sheet are also important. Therefore, a preferred form is to apply the bonding structure of the perforated non-woven fabric and the supporting sheet of the present invention to the bonding structure of the mask non-woven fabric and the liquid-impermeable sheet.

<Fifth aspect> A method of bonding a perforated nonwoven fabric, which laminates a perforated nonwoven fabric and a support sheet, and bonds the perforated nonwoven fabric and the support sheet with a hot melt adhesive in a predetermined area. The perforated nonwoven fabric separates A plurality of holes penetrating the front and back surfaces are provided at intervals. The method of sticking the perforated nonwoven fabric is characterized in that the bonding area on the surface of the support sheet side of the perforated nonwoven fabric is used without using air. After the hot-melt adhesive is coated into a continuous surface, the porous non-woven fabric coated with the hot-melt adhesive is superimposed on the support sheet for bonding, and the support sheet is not coated on the surface of the porous non-woven fabric side The aforementioned hot melt adhesive.

(Effects) This aspect is based on the following novel insight: If the bonding area on the surface of the support sheet side in the perforated nonwoven fabric is coated with the aforementioned hot melt adhesive into a continuous surface without using air, Before bonding with the support sheet, due to the surface tension of the hot-melt adhesive, there is an opening (hole) in the center of the part of the hot-melt adhesive that overlaps the hole of the non-woven fabric with holes, and the opening is expanded to have holes Up to the periphery of the hole of the non-woven fabric. That is, if such a bonding method is adopted, after bonding the perforated non-woven fabric to the support sheet, there is no hot melt adhesive in most of the holes, and air will not cause the hot melt adhesive to leak or ooze from the holes, so When the surface on the opposite side to the support sheet side is touched with a hand, it is not easy to become sticky skin touch. In addition, the hot-melt adhesive that overlaps the hole moves to the periphery of the hole due to surface tension, and the density of the hot-melt adhesive in the periphery of the hole increases. Therefore, the periphery of the hole can be firmly fixed to the support sheet.

<The sixth aspect> The method of sticking a porous nonwoven fabric as in the fifth aspect, wherein the melt viscosity of the hot melt adhesive at a temperature of 140°C is 3000-2600mPa‧s, and the melt viscosity at a temperature of 160°C 1150～1550mPa‧s, and the temperature when the hot melt adhesive is applied to the porous nonwoven fabric is set to 110 to 150°C, and the amount of the hot melt adhesive applied to the porous nonwoven fabric is set to It is 1.0 to 8.0 g/m ² , and the exposure time after applying the hot melt adhesive to the porous nonwoven fabric is 0.1 to 1.0 second.

(Effects) The bonding conditions can be appropriately determined. However, in order to move the hot melt adhesive that overlaps the hole quickly to the periphery of the hole to firmly bond the periphery of the hole, it is preferably set within the above-mentioned range. [Effect of Invention]

As described above, according to the present invention, it is possible to provide advantages such as preventing the skin from becoming sticky due to the hot-melt adhesive, and being able to securely fix the periphery of the hole to the support sheet.

Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. The dotted part in the cross-sectional view represents the adhesive. The adhesive is used as a joining means to join the constituent members on the front and back sides of the adhesive. Bead coating, curtain coating, summit coating or spiral coating, or pattern coating, hot-melt adhesives are implemented in relief Or use the fixed part of the elastic stretchable member to replace the adhesive or together with the adhesive, by using a comb gun or a sure wrap nozzle (elastic coating Nozzle)) Coating or the like is formed by coating the outer peripheral surface of the elastic elastic member. As the hot-melt adhesive, there are, for example, ethylene/vinyl acetate (EVA)-based, adhesive rubber-based (elastic system), olefin-based, polyester/polyamide-based adhesives, etc., and they can be used without particular limitation. As a joining means for joining the constituent members, a means based on material welding such as heat sealing or ultrasonic sealing may also be used.

<Example of shorts-type disposable diapers> Figures 1 to 7 show shorts-type disposable diapers. This shorts-type disposable diaper is provided with: a front outer body 12F, which constitutes the front body F; a rear outer body 12B, which constitutes the back body B; and an inner body 200, which passes through the crotch from the front outer body 12F The intermediate portion extends to the rear exterior body 12B and is provided on the inner side of the exterior bodies 12F and 12B; and the two sides of the front exterior body 12F and the both sides of the rear exterior body 12B are joined to form side seals. 12A, whereby the openings formed by the front and rear end portions of the exterior bodies 12F and 12B become waist openings WO for passing the waist of the wearer, and the width direction both sides of the interior body 200 are respectively provided by the exterior body 12F The part surrounded by the lower edge of 12B and the side edge of the inner body 200 becomes the leg opening LO for the leg to pass through. The inner body 200 is a part for absorbing and holding excrement such as urine, and the outer bodies 12F and 12B are parts for supporting the inner body 200 to the wearer's body. In addition, the symbol Y indicates the full length of the diaper in the unfolded 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 length of the diaper in the unfolded state. Full width.

In addition, the shorts-type disposable diaper of this form has: a waist area T, which is defined as having a side seal portion 12A in the front and back direction range (from the waist opening WO to the upper end of the leg opening LO in the front and back direction range); and, the middle The area L is defined as the front-rear direction range of the portion forming the leg opening LO (between the front-rear direction area of the front body F with the side seal portion 12A and the back body B). The waist area T can be conceptually divided into a "waist portion" W that forms the edge of the waist opening, and a portion lower than the waist portion, that is, the "waist lower portion" U. Generally, when there is a boundary (for example, a change in the thickness or elongation of an elastic stretchable member) of the elastic stress change in the width direction WD in the waist area T, it is closer to the waist opening WO side than the boundary closest to the waist opening WO side When there is no such boundary, the part closer to the waist opening WO than the absorber 56 or the inner body 200 becomes the waist W. These lengths in the front-rear direction vary depending on the size of the product and can be appropriately determined. For example, the waist W can be 15-40 mm, and the lower waist U can be 65-120 mm. On the other hand, the edges on both sides of the middle area L are narrowed into a U-shape or a curved shape along the circumference of the wearer's legs, where the wearer's legs extend in. As a result, the shorts-type disposable diaper in the expanded state generally exhibits an hourglass shape as a whole.

(Inner-outer joint part) The fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by a joining means based on material welding such as heat sealing and ultrasonic sealing, or a hot melt adhesive. In the illustrated form, it is by applying the hot-melt adhesive applied to the back surface of the inner body 200, in this case, it is applied to the back surface of the liquid-impermeable sheet 11 and the side folds The hot-melt adhesive on the root portion 65 of 60 is fixed to the inner surfaces of the exterior bodies 12F and 12B. The inner-outer joint 201 used to fix the inner body 200 and the outer body 12F, 12B can be provided in almost the entire area where the two overlapped, for example, can also be provided in the width direction of the inner body 200 Excluding the two ends.

(Inner body) The inner body 200 can take any shape, and is rectangular in the form shown in the figure. As shown in FIGS. 3 to 5, the inner body 200 includes a top sheet 30 that becomes the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween, and the inner body 200 It is the main body responsible for the absorption function. Symbol 40 indicates an intermediate sheet (second sheet), which is provided between the top sheet 30 and the absorption element 50 in order to quickly transfer the liquid after penetrating the top sheet 30 to the absorption element 50; symbol 60 indicates the side wrinkles 60, which is to prevent excrement from leaking to both sides of the inner body 200, and extends from both sides of the inner body 200 in a manner of contacting the wearer's legs.

(Top Sheet) The top sheet 30 has the property of allowing liquid to penetrate, and can be, for example, a porous or non-porous non-woven fabric, or a porous plastic sheet. In addition, among them, the raw material fibers of the non-woven fabric are not particularly limited. Examples can be: olefin-based, polyester-based, polyamide-based synthetic fibers such as polyethylene or polypropylene; regenerated fibers such as rayon or cupra; natural fibers such as cotton; or using two of these fibers Blended fibers, composite fibers, etc. made from the above. Furthermore, non-woven fabrics can be manufactured by any processing. As the processing method, known methods can be exemplified, such as: spunlace method, spunbond method, thermal bond method, melt blown method, needle punch ) Method, air-through method, point bond method, etc. For example, if flexibility and drape are required, spun-bonding and water needle entanglement are the better processing methods; if bulkiness and flexibility are required, hot air, spot bonding, and thermal bonding are better The processing method.

In addition, 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, regarding the plane direction, the top sheet 30 may be composed of one sheet or two or more sheets.

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, and it may also protrude more laterally than the side edge of the absorbent element 50 without being folded back.

The top sheet 30, for the purpose of preventing positional deviation with respect to the back side member, is preferably fixed to adjacent to it by a bonding means based on material welding such as heat sealing and ultrasonic sealing, or a hot melt adhesive. On the back side member. In the illustrated form, the top sheet 30 is fixed to the front surface of the intermediate sheet 40 and the front surface of the portion located on the front side of the absorber 56 in the packaging sheet 58 by the hot-melt adhesive applied on the back surface thereof.

(Intermediate sheet) In order to make the liquid after penetrating the top sheet 30 move to the absorber quickly, an intermediate sheet (also referred to as the "second sheet") 40 may be provided. 30 fast. This intermediate sheet 40 not only allows the liquid to move quickly to the absorber to improve the absorption performance based on the absorber, but also prevents the phenomenon of "back-seepage" of the absorbed liquid from the absorber, so that the top sheet 30 is often dry. status. The intermediate piece 40 may be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, or hydro-entangled non-woven fabric, spun-bonded non-woven fabric, SMS non-woven fabric, pulp non-woven fabric, a mixed sheet of pulp and haw, point-bonded non-woven fabric or crepe paper (crepe paper). In particular, the hot-air non-woven fabric is relatively fluffy, so it is better. It is preferable to use the composite fiber of the core-sheath structure for the hot-air non-woven fabric. In this case, the resin used for the core may be polypropylene (PP), but it is preferably highly rigid polyester (PET). The basis weight is preferably 20 to 80 g/m ² , more preferably 25 to 60 g/m ² . The thickness of the raw fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is preferable to use eccentric fibers or hollow fibers whose cores are not in the center, or eccentric and hollow fibers as the mixed fibers of all or part of the raw fibers.

The intermediate sheet 40 of the form shown in the figure is arranged in the center so as to be shorter than the width of the absorption element 50, and it may be provided to cover 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 relatively short length centered on the liquid-receiving area.

The intermediate sheet 40 is preferably fixed adjacent to the back surface by a bonding means based on material welding such as heat sealing and ultrasonic sealing or a hot melt adhesive for the purpose of preventing positional deviation with respect to the back side member. On the side member. In the illustrated form, the intermediate sheet 40 is fixed to the front surface of the portion located on the front side of the absorber 56 in the packaging sheet 58 by the hot-melt adhesive applied on the back surface thereof.

(Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited. Examples include: a plastic film made of olefin resins such as polyethylene or polypropylene, or a plastic film provided on the surface of a non-woven fabric Laminated non-woven fabrics, laminated sheets formed by overlapping and joining non-woven fabrics on a plastic film, etc. For the liquid-impermeable sheet 11, it is preferable to use the following materials: From the viewpoint of preventing wet stuffiness, it is preferable to use a material having liquid-impermeability and moisture permeability. As a moisture-permeable plastic film, a microporous plastic film is widely used. The microporous plastic film is formed by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene and forming it into a sheet. It is obtained by extending uniaxially or biaxially. In addition, as the liquid-impermeable sheet 11, it is also possible to use a sheet material that is made liquid-impermeable without using a plastic film according to the following method: (microdenierFiber) is made of non-woven fabrics by applying heat or pressure to narrow the gaps of the fibers, thereby strengthening leak-proof; coated with super absorbent resin or hydrophobic resin or water-repellent processing agent; but in order to use hot-melt adhesives When it is bonded to the mask non-woven fabric 20 described later, sufficient bonding strength is obtained, and it is preferable to use a plastic film.

The liquid-impermeable sheet 11, in addition to the width that can be accommodated on the back side of the absorbent element 50 as shown in the figure, can also be wound around the sides of the absorbent element 50 and extended to the absorbent element 50 in order to improve leakage resistance. The element 50 reaches both sides of the surface on the top sheet 30 side. The width of the extension is preferably about 5-20 mm on the left and right sides.

In addition, an excretion indicator that can change color due to absorption of a liquid component may be provided on the inner side of the liquid-impermeable sheet 11, particularly on the surface on the side of the absorber 56.

(Side wrinkles) The side wrinkles 60 extend along both sides of the inner body 200 and in the entire front and rear direction LD, and are provided to contact the wearer's legs to prevent side leakage. Generally, In other words, structures called three-dimensional folds and structures called plane folds are both included.

The side gathers 60 of the first form shown in FIGS. 3 and 4 are so-called three-dimensional gathers and stand up from the side of the inner body 200 toward the front side. In this side gather 60, the root side part is raised obliquely toward the center side in the width direction, and the part closer to the tip side than the middle part is raised obliquely toward the outer side in the width direction. However, it is not limited to this, and can be changed appropriately. As a whole, they stand up toward the center in the width direction.

To explain in more detail, the side gathers 60 of the first aspect is a belt-shaped gather nonwoven fabric 62 having a length equal to the length of the inner body 200 in the front-rear direction, and the tip end is in the width direction WD Folded back, then folded in half and overlapped, and between the folded portion and the adjacent sheet, in a state in which the elongated corrugated elastic elastic member 63 is stretched in the longitudinal direction, spaced apart in the width direction WD It is formed by fixing a plurality of corrugated elastic elastic members 63. The base end portion (the end portion on the side opposite to the sheet folded portion in the width direction WD) on the side opposite to the tip end of the side gathers 60 is set as a root portion 65, which root portion 65 It is fixed on the side of the inner body 200 closer to the back side than the liquid-impermeable sheet 11; the part other than the root portion 65 is set as the main body portion 66 protruding from the root portion 65 (the side of the folded portion part). In addition, the main body portion 66 is composed of a root-side portion toward the center side in the width direction and a tip-side portion that is folded back toward the outside in the width direction from the tip of the root-side portion. In this form, the side gathers 60 of the surface contact type are used, but the side gathers 60 of the line contact type which are not folded outward in the width direction may also be used. Moreover, both ends in the front-rear direction of the main body portion 66 are set as undulated portions 67, which are relatively fixed to the side surface of the top sheet 30 in the undulated state; The middle portion in the front-rear direction is a free portion 68 that is not fixed, and the corrugated elastic elastic member 63 along the front-rear direction LD is fixed to this free portion 68 in an extended state.

As the pleated non-woven fabric 62, the following pleated non-woven fabrics can be suitably used: spun-bonded non-woven fabrics (SS, SSS, etc.), SMS non-woven fabrics (SMS, SSMMS, etc.), melt-blown non-woven fabrics, etc., using silicone or the like as required A pleated non-woven fabric made of a soft non-woven fabric with excellent uniformity and concealment that is subjected to a hydrophobic treatment; the basis weight of the fiber is preferably about 10 to 30 g/m ² . As the corrugated elastic elastic member 63, a rubber thread or the like can be used. In the case of using elastic fiber rubber thread, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation during fixation is preferably 150-350%, more preferably 200-300%. In addition, the term "elongation" means the value when the natural length is set to 100%. In addition, as shown in the figure, the waterproof membrane 64 may be interposed between the wrinkled non-woven fabric 62 folded in half and overlapped. In this case, the wrinkled non-woven fabric 62 may be partially omitted in the portion where the waterproof membrane 64 is present. However, in order to make the appearance and skin feel of the product like a cloth, it is necessary to form at least the outer surface of the side gathers 60 from the base end to the tip end by the wrinkle non-woven fabric 62 in the form shown in the figure.

The number of corrugated elastic elastic members 63 provided in the free portion of the side corrugations 60 is preferably 2-6, more preferably 3-5. The arrangement interval is 60d, which is more appropriate to be 3-10mm. If it is comprised in this way, it becomes easy to contact the skin with the surface in the range where the wrinkle elastic elastic member 63 is arrange|positioned. The corrugated elastic elastic member 63 may be arranged not only on the tip side but also on the root side.

In the free portion 68 of the side gathers 60, for the adhesion of the inner layer and the outer layer of the gather nonwoven fabric 62, or the fixation of the gather elastic elastic member 63 sandwiched therebetween, various methods can be used. At least one of hot-melt adhesives in the coating method, and fixing means based on material welding such as heat sealing or ultrasonic sealing. If the entire surfaces of the inner layer and the outer layer of the corrugated nonwoven fabric 62 are bonded to each other, the flexibility is impaired. Therefore, the parts other than the bonded portion of the corrugated elastic elastic member 63 are preferably not bonded or bonded weakly. In the form shown in the figure, it has the following structure: using a comb spray gun or rubber band nozzle or other coating means, only the outer peripheral surface of the corrugated elastic elastic member 63 is coated with a hot melt adhesive, and it is sandwiched between the corrugated non-woven fabric 62 Between the inner layer and the outer layer, by using only the hot melt adhesive that has been applied to the outer peripheral surface of the corrugated elastic elastic member 63, the elongated elastic elastic member is applied to the inner layer and the outer side of the corrugated non-woven fabric 62. The fixing of the layers and the fixing between the inner layer and the outer layer of the corrugated non-woven fabric 62.

In addition, for fixing the waterproof membrane 64 installed in the side wrinkles 60 and the wrinkle non-woven fabric 62, or fixing the undercut portion 67 to the side surface of the inner body 200, hot-melt bonding according to various coating methods can be used. At least one of a method based on material welding such as heat sealing or ultrasonic sealing. In the illustrated form, the fixing of the waterproof membrane 64 is slit coating using a hot melt adhesive. In addition, the fixing of the falling portion 67 in the illustrated form is a combination of a hot-melt adhesive and a means based on material welding, but these fixings may be carried out by only any one of the means.

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

In the side gathers 60 of the first form configured as described above, the contraction force of the gather elastic elastic member 63 acts to bring the two ends in the front-rear direction closer to each other, but the main body portion 66 has two sides in the front-rear direction. The ends are fixed so as not to stand up. On the other hand, between these two ends is a free part that is not fixed. Therefore, as shown by the arrow in Figure 3, only the free part is against the body side. Stand up by the way. In particular, if the root portion 65 is located on the back side of the inner body 200, the side wrinkles 60 in the crotch portion and the vicinity thereof are erected in a manner spreading outward in the width direction, so the side wrinkles 60 become flat Abutting around the legs, thus improving the fit.

The size of the side gathers 60 in the first form can be determined appropriately, but in the case of a paper diaper for infants, for example, as shown in Figure 3, the standing height of the side gathers 60 (the main body in the unfolded state) The width direction length of the portion 66) W6 is preferably 15 to 60 mm, particularly preferably 20 to 40 mm. In addition, in a state where the side gathers 60 are folded flatly parallel to the front surface of the top sheet 30, the separation distance W3 between the innermost fold lines is preferably 60 to 190 mm, particularly preferably 70 ~140mm.

The side gathers 60 of the first aspect include only three-dimensional gathers, but may include both three-dimensional gathers and flat gathers, or may include only flat gathers. Figures 12 and 13 show a second form of side gathers 60 including both three-dimensional gathers and flat gathers. Each side wrinkle 60 includes: a first portion 61 (planar wrinkle portion), which is fixed from the root 65 on the side closer to the back side than the liquid-impermeable sheet 11 in the inner body 200 The side of the inner body 200 protrudes; and, the second part 69 (three-dimensional corrugated part), which is fixed from the root part 65 on both sides of the top sheet 30 in the inner body 200 to the inner body 200 The front side protrudes. In more detail, a belt-shaped corrugated nonwoven fabric 62 having a length equal to the length in the front-rear direction of the inner body 200 extends laterally from the root portion 65 and is folded back toward the front side at the tip of the first portion 61. The part folded back to the front side reaches the second part 69 via the first part 61 and is folded back at the tip of the second part 69. The folded parts in the corrugated nonwoven fabric 62 are joined to the facing parts by a hot melt adhesive or the like. In addition, the both ends of the second part 69 in the front-rear direction are set as the undercut parts 67, which are fixed to the side surface of the top sheet 30 in the down state; The middle part of the direction is a free part 68 that is not fixed. In at least the middle part of the front-rear direction of the first part 61 and the free part 68 of the second part 69, one piece is fixed in an extended state, or a plurality of pieces along the front-rear direction LD are fixed at intervals in the width direction WD The corrugated elastic elastic member 63, and by the contraction force of the corrugated elastic elastic member, the free portion 68 of the second portion 69 is contracted in the front-rear direction LD to become a three-dimensional corrugation contacting the periphery of the leg. The first portion 61 shrinks in the front-rear direction LD and becomes a flat wrinkle in contact with the periphery of the leg.

The other points related to the second aspect, such as the material of the corrugated nonwoven fabric 62 and the material of the corrugated elastic elastic member 63, are the same as those of the first aspect, and therefore the description is omitted.

(Absorption element) The absorption element 50 has an absorber 56 and a packaging sheet 58, and the packaging sheet 58 covers the entire absorber 56. The packaging sheet 58 may also be omitted.

(Absorber) The absorber 56 may be formed of an aggregate of fibers. As the fiber aggregate, in addition to the aggregate formed by stacking short fibers such as cotton-like pulp or synthetic fibers, it is also possible to use a long fiber aggregate, which is a combination of synthetic fibers such as cellulose acetate as needed. The tow (fiber bundle) is obtained by opening the fiber. As the basis weight of the fiber, in the case of stacking cotton-like pulp or short fibers, for example, it can be set to about 100 to 300 g/m ² ; in the case of a long fiber aggregate, it can be set to, for example, 30 to 120 g/m. ² or so. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of an aggregate of long fibers, the long fibers may be non-crimped fibers, but crimped fibers are preferred. The degree of crimp of the crimped fiber can be, for example, 5 to 75 per inch, preferably 10 to 50, and more preferably 15 to 50 or so. In addition, crimped fibers that are evenly crimped are often used. It is preferable to disperse and hold the superabsorbent polymer particles in the absorber 56.

The absorbent body 56 may have a rectangular shape, but if it is formed in an hourglass shape with a front end, a rear end, and a gathered part 56N as shown in Figs. 1 and 7, the gathered part 56N is located at the front end and the rear end. The width between the two parts, and the width is narrower than the width of the front end and the rear end, the absorber 56 itself and the side gathers 60 have improved fit around the legs, so it is better.

In addition, the size of the absorber 56 can be appropriately determined as long as it covers the front, rear, left, and right of the urinary opening position, but it is preferable to extend to the peripheral edge of the inner body 200 or its vicinity in the front-rear direction LD and the width direction WD. In addition, the symbol 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles) A part or all of the absorber 56 may contain superabsorbent polymer particles. The so-called superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles 54, the particles used in this disposable diaper can be directly used. For example, it is preferable to use a 500 μm standard sieve (Japanese Industrial Standards (JIS) Z8801-1: 2006). In the screening (vibrating for 5 minutes), the proportion of particles remaining on the sieve is 30% by weight or less; in addition, it is preferable to use a 180μm standard sieve (JIS Z8801-1: 2006) to perform the screening (vibrating) In 5 minutes), the ratio of particles remaining on the sieve is 60% by weight or more.

As a material of the superabsorbent polymer particles, it can be used without any particular limitation, and a material having a water absorption capacity of 40 g/g or more is preferred. As the superabsorbent polymer particles, there are superabsorbent polymer particles such as starch-based, cellulose-based, or synthetic polymer-based particles. The saponification of starch-acrylic acid (salt) graft copolymers and starch-acrylonitrile copolymers can be used. Superabsorbent polymer particles, such as a cross-linked product of sodium carboxymethyl cellulose, or acrylic acid (salt) polymer. As the shape of the superabsorbent polymer particles, a generally used powder or granular shape is preferred, but other shapes may also be used.

As the superabsorbent polymer particles, superabsorbent polymer particles having a water absorption speed of 70 seconds or less, particularly 40 seconds or less are suitably used. If the water absorption speed is too slow, so-called back seepage is likely to occur, that is, the liquid supplied into the absorber 56 returns to the outside of the absorber 56.

As the superabsorbent polymer particles, superabsorbent polymer particles having a gel strength of 1000 Pa or more are suitably used. Thereby, even when the absorbent body 56 is made into a fluffy body, the sticky feeling after liquid absorption can be effectively suppressed.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorbent body 56. Therefore, although it cannot be generalized, it can be set to 50 to 350 g/m ² . If the basis weight of the polymer is less than 50 g/m ² , it is difficult to ensure the absorption capacity. If the basis weight of the polymer exceeds 350 g/m ² , the effect is saturated.

If necessary, the dispersion density or the dispersion amount of the superabsorbent polymer particles can be adjusted in the plane direction of the absorber 56. For example, it is possible to increase the amount of liquid excretion site spreading more than the spreading amount of other sites. Taking into account the difference between men and women, men can increase the density (quantity) of the front side, and women can increase the density (quantity) of the central part. In addition, a portion where the polymer does not exist may be partially (for example, dotted) in the planar direction of the absorber 56.

(Packaging sheet) When the packaging sheet 58 is used, as its material, tissue paper, particularly crepe paper, non-woven fabric, polyethylene laminated non-woven fabric, sheet with small holes, etc. can be used. However, it is more desirable to be a sheet from which the superabsorbent polymer particles do not fall out. In the case of using non-woven fabric instead of crepe paper, it is particularly preferable to use hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.), the material of which can be polypropylene, polyethylene/polypropylene composite material, etc. The basis weight is preferably 5 to 40 g/m ² , and particularly preferably 10 to 30 g/m ² .

The packaging form of the packaging sheet 58 can be appropriately determined. From the viewpoints of ease of manufacture and prevention of leakage of superabsorbent polymer particles from the front and rear edges, the following form is preferred: to surround the front and back surfaces of the absorbent body 56 And the two side surfaces are wound into a cylindrical shape, and the front and rear edges protrude from the front and rear of the absorbent body 56, and the overlapped portion and the front and rear protruding portions are wound by joining means such as hot-melt adhesive and material welding. The overlapping parts are joined.

(Exterior body) The exterior bodies 12F and 12B are composed of the front body 12F, which constitutes the front body F, and the rear exterior body 12B, which constitutes the rear body B. The front outer body 12F and The rear exterior body 12B is discontinuous on the crotch side and is separated in the front-rear direction LD (exterior two-part type). This separation distance 12d can be set to about 150 to 250 mm, for example. In addition, as shown in FIGS. 14 and 15, the exterior body 12 may be an exterior body (exterior integrated type) that passes through the crotch from the front body F and continues to one body of the back body B.

The exterior bodies 12F and 12B have a range in the front-rear direction corresponding to the waist area T, that is, the waist part. In addition, in the present form, the front exterior body 12F does not have a portion corresponding to the middle region L, and the rear exterior body 12B has a buttocks cover C extending from the waist region T to the middle region L side. Although not shown, the front exterior body 12F can be provided with a groin mask protruding from the waist region T to the middle region L side, or it can be set as the groin mask part but not the hip mask part. The form or the part corresponding to the middle area L may not be provided on both the front exterior body 12F and the rear exterior body 12B. In addition, in the illustrated form, the lower edge of the buttocks mask C is formed linearly along the width direction WD in the same manner as the lower edge of the front exterior body 12F, but it may also be located at the outer side in the width direction. The curve on the side of the waist opening.

As shown in FIGS. 4 and 5, the exterior bodies 12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H by joining means such as hot-melt adhesive or welding. The sheet used to form the outer sheet layer 12S and the sheet used to form the inner sheet layer 12H can be made as a common sheet in the form shown in Figure 5, or can be set as separate sheets. Sheet. That is, in the former case, the inner sheet layer is formed by the inner part and outer part of one sheet folded back at the edge of the waist opening WO (or the edge on the crotch side). 12H and outer layer 12S. In addition, in the former form, there is an advantage that the number of sheet materials is small; in the latter form, there is an advantage in that the position is not easily shifted when the inner sheet layer 12H and the outer sheet layer 12S are bonded.

The sheets used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation. Non-woven fabrics are preferred. For example, non-woven fabrics composed of the following fibers can be used: olefins such as polyethylene or polypropylene, polyesters Synthetic fibers such as polyamide-based, polyamide-based, etc.; or, using two or more kinds of mixed fibers, composite fibers, etc. among these. Furthermore, non-woven fabrics can be manufactured by any processing. As the processing method, a known method can be exemplified, such as a water needle entanglement method, a spun bonding method, a thermal bonding method, a melt blown method, a needle rolling method, a hot air method, a point bonding method, and the like. In the case of using a non-woven fabric, its basis weight is preferably about 10 to 30 g/m ² .

In addition, the total basis weight of the exterior bodies 12F and 12B is preferably about 20 to 60 g/m ² .

(Stretching area and non-stretching area) In order to improve the fit to the waist of the wearer on the exterior bodies 12F and 12B, an elongated elastic elastic member 15 to such as a rubber thread is provided between the outer sheet layer 12S and the inner sheet layer 12H. 19 is formed with a stretchable area that can elastically expand and contract in the width direction WD in accordance with the expansion and contraction of the elastic expansion and contraction member. In this stretchable area, in the state of natural length, the outer sheet layer 12S and the inner sheet layer 12H shrink with the contraction of the elastic elastic member to form wrinkles or folds, and if in the length direction of the elastic elastic member At the time of upward stretching, it can be stretched to a predetermined elongation rate at which the outer sheet layer 12S and the inner sheet layer 12H are completely stretched without wrinkles. As the elongated elastic elastic members 15-19, synthetic rubber may be used, or natural rubber may be used.

For the bonding of the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B, or the fixing of the elongated elastic elastic members 15 to 19 sandwiched therebetween, various coating methods can be adopted. At least one of the hot-melt adhesive, heat sealing or ultrasonic sealing and other fixing means based on material welding. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, flexibility is impaired. Therefore, the parts other than the bonding parts of the elongated elastic elastic members 15 to 19 are preferably not bonded or bonded weakly. In the form shown in the figure, it has the following structure: apply hot-melt adhesive only on the outer peripheral surface of the elongated elastic elastic members 15-19 by applying means such as a comb spray gun or rubber band nozzle, and sandwich the two sheets Between the layers 12S, 12H, by using only the hot-melt adhesive that has been applied to the outer peripheral surface of the elongated elastic elastic members 15-19, the elongated elastic elastic members 15-19 are applied to the two sheet layers 12S, The fixing of 12H, and the fixing between the two layers 12S and 12H. Only the elastic elastic members 15 to 19 may be fixed to the outer sheet layer 12S and the inner sheet layer 12H at both ends in the expansion and contraction direction in the expansion and contraction region.

In more detail, between the outer sheet layer 12S and the inner sheet layer 12H in the waist W of the exterior bodies 12F and 12B, a plurality of A waist elastic stretchable member 17. In addition, regarding one or more of the waist elastic stretchable members 17 arranged in the region adjacent to the waist lower portion U, they may overlap with the inner body 200, or may overlap with the inner body 200 in the width direction Except for the central part, they are provided on both sides in the width direction. As this waist elastic stretchable member 17, it is preferable to arrange 3 to 22 pieces at an interval of 4-12 mm with a thickness of about 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber) , A rubber thread with a cross-sectional area of 0.05 to 1.5 mm ² , especially about 0.1 to 1.0 mm ² ), and the elongation of the waist W in the width direction WD obtained therefrom is preferably 150 to 400%, particularly preferably About 220～320%. In addition, the waist W does not need to adopt the same thickness of the waist elastic member 17 or set the same elongation rate in the entire front and rear direction LD. For example, the thickness of the waist elastic member 17 can be made at the upper and lower parts of the waist W Or the elongation is different.

In addition, between the outer sheet layer 12S and the inner sheet layer 12H in the lower waist portion U of the exterior bodies 12F and 12B, a plurality of elongated elastic elastic members are installed at intervals in the vertical direction. Elastic telescopic members 15,19.

As the elastic elastic members 15 and 19 at the waist lower part, it is preferable to arrange 5 to 30 pieces at an interval of 1 to 15 mm, especially an interval of 3 to 8 mm, with a thickness of 155 to 1880 dtex, especially 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 , especially about 0.1 to 1.0 mm ² ) rubber thread; The elongation is preferably 200 to 350%, particularly preferably about 240 to 300%.

In addition, between the outer sheet layer 12S and the inner sheet layer 12H in the buttocks cover portion C of the rear exterior body 12B, a plurality of shields composed of elongated elastic elastic members are installed at intervals in the vertical direction. The cover part elastically stretchable member 16.

As the elastic stretchable member 16 for the mask portion, it is preferable to arrange 2-10 pieces at an interval of 5-40mm, especially an interval of 5-20mm, with a thickness of about 155-1880dtex, especially about 470-1240dtex (synthetic In the case of rubber. In the case of natural rubber, a rubber thread ^{with a cross-sectional area of 0.05 to 1.5 mm 2} , especially about 0.1 to 1.0 mm ^{2 );} Preferably it is 150-300%, particularly preferably 180-260%.

In the case where a groin shield is provided on the front exterior body 12F, the elastic elastic member of the shield may be provided in the same manner.

In the case where the elastic elastic members 15, 16, 19 are provided in the front-rear direction range of the absorber 56, as shown in the waist lower part U or the buttocks mask part C, in a part or all of the range, in order to prevent The contraction of the absorber 56 in the width direction WD includes a part or all of the portion overlapping with the absorber 56 in the width direction WD. Both sides in the width direction are set as expansion and contraction areas A2. The waist portion W is preferably set as the stretchable area A2 over the entire width direction WD, but the non-stretchable area A1 may be provided in the middle of the width direction like the waist lower portion U.

The stretchable area A2 and the non-stretchable area A1 can be configured by supplying elastic stretch members 15-17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, and in the stretchable zone A2 at least in the direction of expansion and contraction. At both ends, the elastic elastic members 15, 16, 19 are fixed by hot-melt adhesive, and the area that becomes the non-stretching area A1 is not fixed, and the area that becomes the non-stretching area A1 is in the middle of the width direction. In one place, the elastic elastic members 15, 16, 19 are cut by pressure and heating, or almost the entire elastic elastic members 15, 16, 19 are cut finely by pressure and heating, in the elastic region A2 Keep the scalability, and eliminate the scalability in the non-stretching area A1. In the former case, as shown in Figure 4, in the non-stretchable area A1, the elastic stretchable members 15, 16, 19 of the stretchable area A2 are continuously cut and the remaining part is used as an unnecessary elastic stretchable member 18. The ground remains between the outer sheet layer 12S and the inner sheet layer 12H in a state of being shrunk to its natural length; in the latter case, although not shown, the elastic elastic members 15, 16, 19 in the elastic region A2 are continuous The remaining part after cutting, and the cut pieces of the elastic elastic members 15, 16, 19 that are not continuous with the elastic elastic members 15, 16, 19 of the two elastic regions A2 are used as unnecessary elastic elastic members, and are individually contracted to their natural length. It remains between the outer sheet layer 12S and the inner sheet layer 12H.

In the shorts-type disposable diaper of the outer two-part split type, since the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, a mask non-woven fabric 20 is provided. The mask non-woven fabric 20 is not The liquid-permeable sheet 11 does not expose the back surface of the inner body 200, and covers the inner body from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200 The back of the 200. In addition, in the form shown in FIGS. 14 and 15, when the outer sheet 12S of the outer body 12 is a non-woven fabric, this outer sheet 12S becomes the mask non-woven fabric 20, which passes through the crotch from the front body F It continues to the back body B and covers the liquid-impermeable sheet 11 of the inner body 200.

The front and rear direction range of the mask nonwoven fabric 20 is not particularly limited as long as it has a portion overlapping the front exterior body 12F and the rear exterior body 12B, and may be as shown in Figures 2, 5, 7 and 9 As shown in FIG. 10, the entirety from the front end to the rear end of the inner body 200 extends in the front-rear direction LD. As shown in FIG. 8, the outer body 12F and the inner body 200 may overlap from the front side as shown in FIG. The middle position of the area in the front-rear direction extends in the front-rear direction LD to the middle position in the front-rear direction of the area where the rear exterior body 12B and the interior body 200 overlap. In the latter case, the front-rear length 20y of the overlapping portion of the mask nonwoven fabric 20 and the front exterior body 12F, and the front-rear direction length 20y of the overlapping portion of the mask nonwoven fabric 20 and the rear exterior body 12B can be appropriately determined. In normal cases, it can be set to about 20 to 40 mm, respectively.

The width direction range of the mask nonwoven fabric 20 is a range which can mask the back surface exposure part of the liquid-impermeable sheet 11. As shown in FIG. Therefore, in the illustrated form, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right side gathers 60, it covers at least from the back side of the base end of one side gather 60 to the other. The mask nonwoven fabric 20 is provided in the form of the width direction range of the base end part of one side gather 60 to the back side. Thereby, the liquid-impermeable sheet 11 can be concealed by the wrinkle non-woven fabric 62 that covers the non-woven fabric 20 and the side gathers 60, and, when viewed from the outer surface, the holes 14 at both ends in the width direction of the non-woven fabric 20 can be masked. It will not be hidden by the pleated non-woven fabric 62. In addition, even if the widthwise ends of the mask nonwoven fabric 20 do not cover the back sides of the base ends of the side gathers 60, the corrugated nonwoven fabric 62 covers the backsides of the mask nonwoven fabrics 20 in the width direction. The liquid-impermeable sheet 11 can also be concealed by the mask non-woven fabric 20 and the corrugated non-woven fabric 62. In this case, if the total light transmittance of the corrugated non-woven fabric 62 is 60 to 90%, even if the corrugated non-woven fabric 62 covers The part covering the non-woven fabric 20 can also see through and fully visually confirm the holes 14 of the perforated non-woven fabric. Therefore, it can be recognized that the part with the function of improving air permeability extends to the side wrinkles 60, and the visual effect of the holes 14 can be fully exerted. .

<Examples of adhesive-type disposable diapers> Figures 16 to 20 show an example of adhesive-type disposable diapers. The symbol X in the figure represents the full width of the diaper without the fastening tape, and the symbol Y represents the width of the diaper. full length. This sticky disposable diaper has: an absorbent body 56 which extends from the abdominal side to the back side; a liquid-permeable top sheet 30 which covers the front side of the absorbent body 56; and a liquid-impermeable sheet 11 which covers The back side of the absorbent body 56; and, this adhesive-type disposable diaper has: an end flap portion EF on the abdominal side and an end flap portion EF on the back side, which are the portions protruding to the front side and the back side of the absorbent body 56 respectively , And it is a part that does not have the absorber 56; In the middle of the front-rear direction of the side flap SF, a folded part is formed along the periphery of the leg, and a fastening band 13 is respectively provided on the back side of the folded part.

The back surface of the liquid-impermeable sheet 11 is covered by a mask non-woven fabric 20. The mask non-woven fabric 20 extends to the periphery of the diaper, and the liquid-impermeable sheet 11 extends in the front-rear direction to the front and rear edges of the diaper, and extends in the width direction to between the side edge of the absorbent body and the side edge of the mask non-woven fabric 20 However, the mask nonwoven fabric 20 may be provided as only a part in the front-rear direction, only a part in the width direction, or both of a part in the front-rear direction and a part in the width direction, as necessary. For example, when a part of the liquid-impermeable sheet 11 is covered with other materials such as a corrugated non-woven fabric, the non-woven fabric 20 may not be provided for this part.

The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, and have a size slightly larger than the absorbent element 50 in the front-rear direction and the width direction, and the top sheet 30 is larger than the side edge of the absorbent element 50. The protruding peripheral edge portion and the peripheral edge portion of the liquid-impermeable sheet 11 that protrude more than the side edge of the absorbing element 50 are joined by a hot melt adhesive or the like.

In addition, as in the case of shorts-type disposable diapers, the absorbent body 56 can be used as the absorbent element of the packaged sheet to be interposed between the top sheet and the liquid-impermeable sheet, and it can be provided between the top sheet and the absorbent element. The middle piece 40. The intermediate sheet 40 of the form shown in the figure is arranged in the center so as to be shorter than the width of the absorption element 50, and it may be provided to cover 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 relatively short length centered on the liquid-receiving area. Furthermore, as in the case of a shorts-type disposable diaper, an indicator may be provided which changes color when it comes into contact with the liquid component of the excrement.

On both sides in the width direction of the front side of the sticky disposable diaper, side gathers 60 are respectively provided. Each side wrinkle 60 includes: a first part 61 (planar wrinkle part), which is provided on each side flap part SF; and, a second part 69 (three-dimensional wrinkle part) which is on both sides of the top sheet 30 On prominent. In more detail, a belt-shaped pleated nonwoven fabric 62 having a length equal to the full length Y of the diaper extends from the first portion 61 to the second portion 69, and in the first portion 61, the pleated nonwoven fabric 62 is bonded by heat fusion The mask non-woven fabric 20 is joined to the mask non-woven fabric 20 with an agent or the like, and between these non-woven fabrics, one piece is fixed in a stretched state, or a plurality of pleats along the front-rear direction LD are fixed at intervals in the width direction WD. The member 63, and the first portion 61 shrinks in the front-rear direction LD by the contraction force of the corrugated elastic elastic member, and becomes a plane corrugation in contact with the periphery of the leg. In addition, the corrugated nonwoven fabric 62 has an extension portion that extends from the first portion 61 as a root to the center side in the width direction WD, and at least this extension portion is folded back at the tip to form a two-layer structure. The two ends of the extension in the front-rear direction LD are set as the undercut portion 67, which is fixed to the top sheet 30. On the other hand, the middle portion of the front-rear direction LD located between the two ends of the front-rear direction LD is set to not Fixed free part 68. In the free portion 68, one is fixed in an extended state, or a plurality of corrugated elastic members 63 along the front-rear direction LD are fixed at intervals in the width direction WD, and the corrugated elastic member 63 With contraction force, the free portion 68 of the second portion 69 contracts in the front-rear direction LD and becomes a three-dimensional wrinkle in contact with the periphery of the leg.

The fastening tape 13 in the illustrated form has: a sheet base material that constitutes a belt attachment portion 13C fixed to the side of the diaper, and a belt main body portion 13B protruding from the belt attachment portion 13C; and, for the abdominal side The locking portion 13A is provided at the middle portion in the width direction of the belt main body portion 13B in the sheet base material; and the portion closer to the tip side than the locking portion 13A is used as a catching portion. The belt attachment portion 13C of the fastening tape 13 is clamped between the corrugated nonwoven fabric 62 and the mask nonwoven fabric 20, and is bonded to the two nonwoven fabrics 62, 20 by a hot-melt adhesive, and the corrugated nonwoven fabric 62 constitutes the side wings The inner layer of the side flap portion, and the mask non-woven fabric 20 constitutes the outer layer of the side flap portion. In addition, the locking portion 13A is joined to the inner surface of the belt main body portion 13B with an adhesive.

As the locking portion 13A, a hook member (a male member) of a mechanical fastener (face fastener) is preferable. The hook member has a large number of engagement protrusions on the outer surface side. As the shape of the engagement protrusion, there are (A) V shape, (B) J shape, (C) mushroom shape, (D) T shape, (E) double J shape (make the J shape structure back to back It can be any shape. Of course, an adhesive material layer can also be provided as the locking portion of the fastening tape 13.

In addition, as the sheet base material formed from the belt mounting portion 13C to the belt main body portion 13B, non-woven fabric, plastic film, polyethylene laminated non-woven fabric, paper, or composite materials such as these can be used.

When wearing a diaper, in a state where the side flap SF on the back side is superimposed on the outside of the side flap SF on the ventral side, the fastening tape 13 is locked to an appropriate portion on the outer surface of the ventral side. The position and size of the locking portion of the fastening band 13 can be arbitrarily determined.

It is preferable that a target piece 24 is provided at the locking position of the fastening band 13 on the ventral side, and the target piece 24 has a target for facilitating the locking. In the case where the locking portion 13A is a hook member, as the target sheet 24, a film-type target sheet having a film layer and an engaging layer provided on the entire outer surface of the film layer can be suitably used, and The hook of the locking portion 13A can be detachably engaged with the engagement layer. As the engagement layer in this case, in addition to a form in which a loop woven with thread is attached to the film layer, the following form is also known: a thermoplastic resin non-woven fabric layer by intermittent ultrasonic waves Sealed and installed on the film layer, and non-woven fibers form a ring; all can be appropriately used. In addition, it is also possible to use a non-film type target tape, which is formed by embossing a thermoplastic resin non-woven fabric without a film layer. Among these target belts, the hooks of the fastening belt 13 are wrapped around or hung on the loop, thereby joining the fastening belt 13.

In the case where the locking portion 13A is an adhesive material layer, a target sheet with high adhesiveness can be used. The target sheet is obtained by applying a peeling treatment to the surface of a sheet substrate composed of a plastic film with a smooth surface.

In addition, in the case where the locking portion of the fastening tape 13 on the ventral side is made of non-woven fabric, for example, in the case where the mask non-woven fabric 20 of the illustrated form is made of non-woven fabric, and in the case of the fastening tape 13 When the locking portion 13A is a hook member, the target sheet 24 may be omitted, and the hook member may be wrapped around the non-woven fabric covering the non-woven fabric 20 to be locked. In this case, the target sheet 24 may be provided between the mask non-woven fabric 20 and the liquid-impermeable sheet 11.

The end flaps EF are parts that protrude to the front and rear sides of the absorbent main body 10, and do not have the absorbent element 50. The protruding parts on the front side are the end flaps EF on the ventral side, and the rear side The protruding part is the end wing part EF on the back side. For the aforementioned reasons, the length of the end flap EF on the back side in the front-rear direction is preferably set to be the same as or shorter than the length of the attachment portion of the fastening tape 13 in the front-rear direction. If 50 is too close, it is easy to create a gap between the back end of the diaper and the body surface due to the thickness and stiffness of the absorbing element 50, so it is preferably 10 mm or more. The front-to-back length of the ventral end flap EF and the back-side end flap EF is preferably about 5 to 20% of the front-to-rear length L of the entire diaper. It is 10-60 mm, and 20-50 mm is especially suitable.

In order to improve the fit of the back side of the diaper, it is preferable to provide a belt-shaped back side stretch sheet 70 that elastically stretches in the width direction between the two fastening bands 13 in the form shown in the figure. Both ends of the back side stretch sheet 70 preferably extend to a portion overlapping the attachment portion of the two fastening bands 13, and may be separated on the center side in the width direction. The size of the back-side stretch sheet 70 in the front-rear direction is preferably set within a range of approximately plus or minus 20% with respect to the size of the attachment portion of the fastening band 13 in the front-rear direction. In addition, if the back side stretch sheet 70 is arranged to overlap the boundary line between the back side end flap EF and the absorption element 50 as shown in the figure, the back side end portion of the absorption element 50 sufficiently abuts against the body, so Better. The back stretch sheet 70 may be a sheet-like elastic member such as a rubber sheet, and from the viewpoint of air permeability, it is preferable to use non-woven fabric or paper. In this case, an air-permeable sheet-like elastic member such as a stretch nonwoven fabric can also be used, but the following back-side stretch sheet is suitable: as shown in Figure 20(a), bonded by hot-melt adhesive, etc. Two sheets of non-woven fabric and other sheet substrate 71 are bonded together, and an elastic elastic member 72 in the form of a porous sheet, mesh, or elongated (wire or rope, etc.) shape is stretched in the width direction. It is fixed between the two substrates 71. The elongation rate of the elastic elastic member 72 is preferably about 150 to 250%. In addition, in the case of using an elongated (wire-shaped or rope-shaped, etc.) elastic elastic member as the elastic elastic member 72, it is preferable to arrange 5-15 pieces at an interval 72d of 3-10mm, with a thickness of 420-1120 dtex. The elastic telescopic member.

In addition, if a part of the elastic elastic member 72 is arranged to traverse the absorption element 50 as shown in the figure, the fit of the absorption element 50 is improved, so it is preferable. In this case, if the elasticity is stretched and contracted by means such as cutting The contraction force of a part or all of the overlapping portion of the member 72 and the absorption element 50 does not work, and the back side end of the absorption element 50 does not contract in the width direction, so the fit is further improved.

In addition, the elastic elastic member 72 may be fixed over the entire length of the sheet base 71 in the length direction of the sheet (the width direction of the diaper). In the range of about 5 to 20 mm of the end in the front-rear direction (the width direction of the diaper), the contraction force is disabled or the elastic elastic member 72 does not exist. In the illustrated form, the back side stretch sheet 70 is provided so that on both sides in the width direction of the liquid-impermeable sheet 11, it is sandwiched between the corrugated non-woven fabric 62 and the mask non-woven fabric 20, and is not transparent The overlapping portion of the liquid sheet 11 is sandwiched between the liquid impermeable sheet 11 and the absorbing element 50; the back stretch sheet 70 may also be provided between the liquid impermeable sheet 11 and the mask non-woven fabric 20, It can also be provided on the outer surface of the mask non-woven fabric 20, and in addition, it can also be provided between the top sheet 30 and the absorbing element 50. In addition, the back side stretch sheet 70 may be provided on the top sheet 30. In this case, on both sides in the width direction of the liquid-impermeable sheet 11, the corrugated non-woven fabric 62 may be provided. In addition, when a plurality of sheet base materials are overlapped to form the mask nonwoven fabric 20, the entire back side stretch sheet 70 may be provided between the sheet base materials of the mask nonwoven fabric 20.

<Mask nonwoven fabric> The mask nonwoven fabric 20 covers the back side of the liquid impermeable sheet 11, and at least a part of the portion of the mask nonwoven fabric 20 covering the liquid impermeable sheet 11 forms the outer surface of the product. It is characterized in that the mask non-woven fabric 20 is a perforated non-woven fabric, and a plurality of holes 14 penetrating the front surface and the back surface are provided at intervals. The type of fiber of the mask non-woven fabric 20 or the processing method of fiber bonding (interlaced) are not particularly limited. It is preferable to use a hot-air non-woven fabric. In this case, the basis weight is preferably 20-30 g/m ² , and the thickness is Preferably it is 0.3 to 1.0 mm.

In addition, in the aforementioned two-part outer shorts type disposable diaper, if the side edge of the mask non-woven fabric 20 is located at the part with the narrowest width of the absorber 56 (the full width is the case without the gathered part 56N). If there is 56N of gathered parts, it is the narrowest part of the gathered parts 56N). If the side edges are the same position or located on the center side in the width direction than this position, the mask non-woven fabric 20 will only be located on the entire mask. The part where the non-woven fabric 20 overlaps the absorbent body 56 is the part where the rigidity is high and it is not easy to produce wrinkles or creases. Therefore, the two sides of the mask non-woven fabric 20 are not easy to shrink in the front and rear direction LD, and it is not easy to be on both sides of the mask non-woven fabric 20. Wrinkles are formed on the side, or it is unlikely that the hole 14 is crushed.

In consideration of the effect of enhancing air permeability, the mask non-woven fabric 20 preferably has holes 14 throughout the front and rear directions. However, it is also possible to have a region where the holes 14 are not present in a part of the front and rear direction LD. On the other hand, it is preferable to provide holes 14 throughout the entire mask non-woven fabric 20 in the width direction WD. That is, in the form in which the both ends of the mask nonwoven fabric 20 in the width direction WD have regions where the holes 14 are not present, if the holes 14 are opened by a method other than punching performed by a cutter , As will be described later, the fibers in the peripheral portion 14e of the hole 14 will shrink outward or in the vertical direction to warp the peripheral portion 14e of the hole 14, and the thickness of the porous area becomes thicker than that of the non-porous area. When the material of the mask non-woven fabric 20 is stored in the wound state, the non-porous area becomes a loosely wound state, and thus wrinkles or creases may be formed in the non-porous areas on both sides. Therefore, it is preferable to form the hole 14 over the entire width direction WD as shown in the figure.

For example, in the aforementioned outerwear-integrated shorts-type disposable diaper, as shown in Fig. 14, holes may be formed only in the region in the front-rear direction that does not have elastic elastic members 15-18 in the mask non-woven fabric 20 14. On the other hand, in the aforementioned adhesive-type disposable diaper, as shown in FIG. 17, the holes 14 may be formed over the entire front and rear direction and the entire width direction of the mask nonwoven fabric 20. As shown in FIG. In addition, in the aforementioned two-part outer shorts-type disposable diaper, it is preferable that as shown in Figs. 2 and 8, the formation area of the hole 14 is from the front outer outer cover of the masking non-woven fabric 20 The overlapping portion of the body 12F extends to the overlapping portion with the rear exterior body 12B.

The planar shape (opening shape) of each hole 14 can be appropriately determined. In addition to the elongated hole shape shown in Figure 21(a) and Figure 21(b), it can also be set to any of the following shapes: The perfect circle shown in Figure 21(c) and Figure 21(e); the ellipse shown in Figure 21(d); polygons such as triangles, rectangles, and rhombuses; stars, clouds, etc. The size of each hole 14 is not particularly limited. The maximum size of 14L in the front and rear direction LD is preferably set to 0.3 to 1.8 mm, particularly preferably set to 0.4 to 1.0 mm; the maximum size of the width direction WD is 14W, preferably It is set to 0.2 to 1.5 mm, particularly preferably 0.3 to 1.0 mm. When the shape of the hole 14 is a shape that is longer in one of the directions such as an elongated hole, an ellipse, a rectangle, a rhombus, etc. (a shape in which the full length in one direction is longer than the full length in the direction perpendicular to it) Below, the maximum dimension in the longitudinal direction is preferably 1.2 to 2.5 times the maximum dimension in the direction perpendicular thereto. In addition, when the shape of the hole 14 is long in one of the directions, it is preferable that the longitudinal direction of the hole 14 is the front-rear direction LD, but it may be the width direction WD or the oblique direction.

The area and area ratio of each hole 14 may be appropriately determined. The area is preferably about 0.1 to 2.7 mm ² (especially 0.1 to 1.0 mm ² ), and the area ratio is preferably 1.0 to 15.0% (especially 5.0 ~10.0%).

The plane arrangement of the holes 14 can be appropriately determined, and a regularly repeated plane arrangement is preferred, except for the diagonal grid shape shown in Figure 21(a) or the hexagonal grid shape shown in Figure 21(b) (These are also called staggered shapes), square grids as shown in Figure 21(c), rectangular grids as shown in Figure 21(d), and parallel bodies as shown in Figure 21(e) Grid (as shown in the figure, a form in which a plurality of groups of parallel diagonal rows are arranged in such a way that two groups intersect each other), etc. (including such that these groups are inclined at an angle of less than 90 degrees with respect to the front-rear direction LD In addition to repeating regularly as in the form of a shape), a group of holes 14 (the arrangement of the group unit may be regular or irregular, or patterns, characters, etc.) may be regularly repeated.

The interval 14y in the front-rear direction and 14x in the width direction of the holes 14 can be appropriately determined. In consideration of air permeability, it is preferable to set 14y in the range of 0.9 to 8.0 mm, and 14x in the range of 2.0 to 10 mm; Ideally, 14y is set in the range of 1.0 to 3.0 mm, and 14x is set in the range of 3.0 to 5.0 mm. In particular, as shown in Figure 21(d), the holes 14 are arranged in the front-rear direction at intervals 14y that are narrower than the maximum dimension 14L in the front-rear direction of the holes 14, and the rows of the holes 14 are in the width direction WD The above is repeated at predetermined intervals, and the widthwise interval 14x is larger than the maximum dimension 14L in the front-rear direction of the hole 14 (furthermore, if it is more than 3 times the widthwise dimension 14W of the hole 14), it can be significantly The air permeability is improved without impairing the softness or bulkiness. In addition, the tensile strength of the sheet in the front-rear direction, which is important at the time of manufacture, does not decrease, which is preferable. In particular, in this case, it is preferable to set the shape of the hole 14 to a shape elongated in the front-rear direction LD.

The cross-sectional shape of the hole 14 may be any of the following forms: In the first form, as shown in FIG. 22, the thickness of the non-woven fabric becomes thinner from the periphery of the hole 14 as it approaches the edge of the hole 14, and the thickness of the hole 14 The edge is located in the middle of the thickness direction of the non-woven fabric; the second form, as shown in Figure 23, the peripheral part 14e of the hole 14 is tilted toward the front side, and the tilt height 14h is almost equal; and, the third form, which is As shown in Fig. 24, the peripheral portion 14e of the hole 14 is tilted toward the front side, and has the opposite portion with the highest tilt height 14i, and the lowest portion with the tilt height 14j. The lowest tilt height 14j is An opposing portion that faces the opposite portion in a direction perpendicular to the opposing portion where the tilted height 14i is the highest. From the viewpoint of air permeability, the second form and the third form are more desirable. The portions having the holes 14 are thicker than the surroundings. In the third form, in particular, the raised height 14i of the peripheral portion 14e of the hole 14 The gap formed by the difference between 14j and 14j helps to improve air permeability, so it is better. In the second form and the third form, the lift height 14h, 14i, 14j (the height of the appearance measured with an optical microscope under no pressure) is preferably about 0.2 to 1.2 mm. In the form, the highest tilting height 14i is preferably about 1.1 to 1.4 times the lowest tilting height 14j.

The hole 14 can be a punched hole 14, the edge of which is formed by the cut ends of the fiber; it can also be a non-punched hole 14 (the edge of which has a high fiber density), which hardly exists in the periphery 14e of the hole 14 The cut end of the fiber is formed by inserting a pin between the fiber and expanding it. The former is applicable to the first form, and the latter is applicable to the second and third forms. For example, if a hole 14 having a shape that is long in one direction is formed by inserting a pin, the fibers of the peripheral portion 14e of the hole 14 shrink outward or in the vertical direction, and the peripheral portion 14e of the hole 14 is raised, and the hole 14 The raised height i of the opposing portion in the longitudinal direction becomes higher than the raised height j of the opposing portion in the direction perpendicular to the longitudinal direction. In the second and third aspects described above, the edge portion of the portion where the peripheral portion 14e of the hole 14 is tilted toward the front may have a fiber density lower than that of the peripheral portion, but it is preferably the same or higher. In addition, it is preferable that the fibers in the peripheral portion 14e of the hole 14 are welded to each other, but they may not be welded.

The mask non-woven fabric 20 is bonded to the liquid-impermeable sheet 11 (corresponding to the supporting sheet of the present invention) by the hot-melt adhesive 20H in the bonding area that covers almost the whole. The adhesion area of the mask nonwoven fabric 20 may be a non-adhesive area in addition to the entire front and rear direction and the width direction of the mask nonwoven fabric 20. For example, in the aforementioned two-part outer shorts-type disposable diaper, if the widthwise ends of the mask nonwoven fabric 20 are non-adhesive regions, even when the absorbent body 56 is affected by the side wrinkles 60 In a state where the side portions are slightly contracted, they are not easily affected by this, which brings the following advantage: it is not easy to form wrinkles or creases on the mask non-woven fabric 20. In this case, the width of the non-adhesive portion at both ends in the width direction of the mask nonwoven fabric 20 may be appropriately determined, and may be 3 to 10 mm, and preferably 5 to 8 mm, for example.

It is characterized in that, as shown in Fig. 11, no hot-melt adhesive is present in the region of the adhesive region between the mask nonwoven fabric 20 and the liquid-impermeable sheet 11 that is closer to the center than the peripheral edge portion 14i of the region overlapping with the hole 14 20H, and the hot-melt adhesive 20H in the form of a continuous surface exists in a region other than the peripheral edge portion 14i of the region overlapping with the hole 14. Since there is no hot-melt adhesive 20H at the center side of the peripheral portion 14i of the area overlapping with the hole 14, it is not easy to become sticky skin feel by the hot-melt adhesive 20H, and the hole 14 can be removed. The peripheral portion 14i is securely fixed to the liquid-impermeable sheet 11.

As a representative bonding state, the following state can be exemplified: as shown in Figures 11(a) and 11(b), there is no hot-melt adhesive 20H in the area overlapping with the hole 14, and it is in contact with the hole 14. There is a continuous surface hot melt adhesive 20H in the area other than the overlapped area; and, as shown in Figure 11(c) and Figure 11(d), the hot melt adhesive 20H oozes out to overlap the hole 14 However, there is no hot-melt adhesive 20H at the peripheral edge portion 14i of the region overlapping with the hole 14 in the center side than the peripheral edge portion 14i of the region overlapping with the hole 14, and in the region other than the peripheral edge portion 14i of the region overlapping with the hole 14 There is a continuous surface hot melt adhesive 20H. The former state is particularly ideal. However, the peripheral edge portion 14i of the area overlapping with the hole 14 is a portion close to the peripheral portion 14e of the hole 14, and the mask non-woven fabric 20 has a certain thickness, so even if the hot-melt adhesive 20H is like the latter If it oozes out to this part, even when touching the surface on the opposite side to the liquid-impermeable sheet 11 side in the mask nonwoven fabric 20 with a hand, the hot-melt adhesive 20H is hardly touched directly. In addition, the exudation width of the hot-melt adhesive 20H in the peripheral edge portion 14i of the area overlapping the hole 14 is less than half the thickness of the mask nonwoven fabric 20, preferably about 0.5 mm or less. In addition, 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 mask non-woven fabric 20 is not particularly limited. 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, it will be compared with the self The pore size observed on the surface opposite to the liquid-impermeable sheet 11 side is smaller than the pore size observed from the liquid-impermeable sheet 11 side. It is not easy to touch the hot melt adhesive 20H. In addition, the warped portion supports the mask non-woven fabric 20 with respect to the liquid-impermeable sheet 11 like a pillar, and therefore is bulky compared to a non-porous non-woven fabric of the same basis weight, and is also excellent in air permeability. Furthermore, in areas other than the peripheral portion 14e of the hole 14, the adhesion between the mask nonwoven fabric 20 and the liquid-impermeable sheet 11 is likely to float (although in Figure 11 it is depicted as a hot melt adhesive 20H filled with no gaps There is a space between the sheets, but the actual coating amount is small and gaps are likely to occur), so the surrounding part 14e of the hole 14 is firmly bonded, and the other areas become incomplete bonding (substantially the bonding area becomes smaller) ), whereby excellent softness and lightness can be obtained.

The characteristic bonding structure described above can be manufactured by, for example, the equipment shown in FIG. 25. That is, the laminating equipment of this perforated nonwoven fabric is to send out the continuous support sheet 160 in the form of a strip from a raw material roll not shown, and convey it along the continuous direction. On the other hand, it sends out the continuous strip 160. Perforated non-woven fabric 151, and after applying a hot-melt adhesive 20H to its bonding area by a hot-melt applicator (hot-melt adhesive coating device), the coated surface of the hot-melt adhesive 20H is overlapped on the support sheet 160, and the pressure roller 140 is used for pressure bonding. The example in the figure assumes that the perforated non-woven fabric 151 becomes the aforementioned mask non-woven fabric 20 and the support sheet 160 becomes the aforementioned liquid-impermeable sheet 11 manufacturing equipment, which can be supported by a hot melt applicator 171 for fixing absorption elements The upper surface of the sheet 160 is coated with the hot-melt adhesive 20H for the absorption element 50, and the absorption element 50 is sequentially supplied at intervals in the MD direction and bonded, and then the perforated nonwoven fabric 151 is bonded to the opposite of the support sheet 160 Surface; but not limited to this, not only the bonding step of the perforated non-woven fabric 151 and the supporting sheet 160, but also can be applied to other purposes. In addition, the perforated non-woven fabric 151 that has been perforated can be fed from the raw material reel to supply the perforated non-woven fabric 151, or the non-porous non-woven fabric without holes 14 can be supplied and perforated on the production line and then coated with hot melt adhesive 20H and attached to the supporting sheet 160.

It is characterized in that when the hot-melt adhesive 20H is applied to the porous nonwoven fabric 151, the hot-melt adhesive 20H is applied to the bonding area on the side of the support sheet 160 in the porous nonwoven fabric 151 without using air. After forming a continuous surface, the porous non-woven fabric 151 coated with hot-melt adhesive 20H is superimposed on the support sheet 160 for bonding. The support sheet 160 is not coated with hot-melt adhesive on the surface on the side of the porous non-woven fabric 151 20H. If this bonding method is adopted, as shown by the arrow in Fig. 26, the hot-melt adhesive 20H is applied to the perforated non-woven fabric 151 in a continuous surface shape, and the hot-melt adhesive 20H is applied to the support sheet before bonding. The surface tension of the adhesive 20H, and in the hot-melt adhesive 20H, there is an opening (hole) h in the center of the portion overlapping the hole 14 of the perforated nonwoven fabric 151, and the opening h is expanded to the hole 14 of the perforated nonwoven fabric 151 To the peripheral part 14e. Therefore, after bonding the perforated nonwoven fabric 151 to the support sheet 160, as in the example shown in Figure 11, there is no hot-melt adhesive 20H in most of the holes 14, and no hot-melt adhesive 20H is caused by air. Since it leaks or oozes from the hole, when the surface on the opposite side to the support sheet 160 side is touched with a hand, it is not easy to become a sticky skin touch. In addition, in general, the adhesiveness of the hot melt adhesive to the plastic film is better than that of the non-woven fabric. Therefore, by applying the adhesive to the non-woven fabric side in this way, a higher bonding strength can be obtained. Further, 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 becomes higher, so that the peripheral portion 14e of the hole can be It is firmly fixed on the supporting piece 160.

As the hot-melt applicator 170 that coats the hot-melt adhesive into a continuous surface without using air, it can be suitably used: slit coating, which makes the coating head (die) contact the porous nonwoven fabric Adhesive surface, and extrude the hot melt adhesive from the slit along the CD direction provided at the tip of the coating head to perform coating; or, non-contact slit coating, use the coating head (die) With the bonding surface of the porous nonwoven fabric floating, the hot melt adhesive is extruded from the slit along the CD direction provided at the tip of the coating head, and the heat The melt adhesive is stretched and coated into an extremely thin film.

The bonding conditions can be appropriately determined. In order to make the hot-melt adhesive 20H overlapped with the hole 14 move to the surrounding part 14e of the hole 14 quickly, and to adhere the surrounding part 14e of the hole 14 firmly, it is desirable to satisfy the following conditions at least one.

The melt viscosity of the hot melt adhesive (temperature 140℃): 2600~3000mPa‧s; the melt viscosity of the hot melt adhesive (temperature 160℃): 1150~1550mPa‧s; when the porous non-woven fabric is coated with the hot melt adhesive Temperature: 110~150℃; coating amount of hot melt adhesive for porous non-woven fabric: 1.0~8.0g/m ² ; open time after applying hot melt adhesive: 0.1~1.0 Second.

On the other hand, in the aforementioned two-part outer pants type disposable diaper, if the total light transmittance of the portion of the outer body 12 that does not have the elastic elastic member in at least the portion overlapping the mask non-woven fabric 20 is 50% or more (preferably 65% or more), even in the mask non-woven fabric 20 that is shielded by the front exterior body 12F and the rear exterior body 12B, it is possible to see through and fully visually confirm the perforated non-woven fabric Therefore, it can be recognized that the part with the function of improving air permeability is not only between the front exterior body 12F and the rear exterior body 12B, but also extends to the front and rear sides, and the vision of the hole 14 can be fully utilized The effect is therefore better. In addition, the total light transmittance of the exterior body 12 refers to a value measured in a state where the outer sheet layer 12S and the inner sheet layer 12H are overlapped.

In addition, with regard to the inner and outer joints 201 in the aforementioned outer two-parted shorts-type disposable diaper, a preferred form is: as shown in FIGS. 9 and 10, the front outer body 12F and the rear outer body 12F At least one of the bodies 12B is joined to the inner body 200 in a region overlapping with both ends in the width direction of the inner body 200, and in a region between the regions overlapping with both ends in the width direction of the inner body 200 Among them, it is made to be non-adhesive or intermittently and releasably adhering over a part of the crotch side or the entire front-rear direction LD. In this case, the gap between the inner body 200 and the outer body 12 opens to the crotch side, and the air permeability can be improved. In addition, by rolling up this part, the perforated mask non-woven fabric 20 that is shielded by the exterior body 12 can be directly seen, so the visual effect of the aperture 14 is more excellent.

<Others> In the above example, the mask non-woven fabric 20 covering the back side of the liquid-impermeable sheet 11 is set to a perforated non-woven fabric, and the present invention is applied to the adhesive structure of the perforated non-woven fabric and the liquid-impermeable sheet 11 However, of course, the perforated non-woven fabric can also be used to mask non-woven fabric members other than the non-woven fabric 20, and the bonding structure and bonding method of the present invention can be applied. A preferred example is to apply the present invention to the following sheet on the skin side The bonding structure of the material: the top sheet 30 is set as a perforated non-woven fabric, and the middle sheet 40 is set as a support sheet.

<Explanation of terms in the specification> Unless otherwise stated in the specification, the following terms in the specification have the following meanings.

• "Front-back (longitudinal) direction" refers to the direction connecting the ventral side (front side) and the back side (rear side), and "width direction" refers to the direction perpendicular to the front-back direction (left-right direction).

‧"Front side" means the side close to the wearer's skin when wearing shorts-type disposable diapers, and "back side" means the side farther from the wearer's skin when wearing shorts-type disposable diapers.

‧"Front" refers to the side of the component close to the wearer's skin when wearing shorts-type disposable diapers, and "back" refers to the side farther from the wearer's skin when wearing shorts-type disposable diapers.

‧"Total light transmittance" means the value measured in accordance with JIS-K7105.

‧"Area rate" means the ratio of the target part to the unit area, which is the total area of the target part (such as holes) in the target area (such as masking non-woven fabric) divided by the area of the target area and expressed as a percentage . In a form in which a plurality of target parts are provided at intervals, it is preferable to set the target area to a size such that 10 or more target parts are included, and to obtain the area ratio. For example, the area ratio of the holes can be measured in the following order using, for example, the trade name VHX-1000 of KEYENCE Corporation, and setting the measurement condition to 20 times. (1) Set the lens to 20 times and adjust the focus. Adjust the position of the non-woven fabric in such a way that there are 4×6 holes into the field of view. (2) Specify the brightness of the hole area and measure the area of the hole. (3) Click the color extraction of "Area Measurement" of "Measurement and Comment". Click on the part of the hole. (4) Click "Measure together" and check "Display measurement result window" to save data in CSV (Comma-Separated Values, comma-separated format).

• "Elongation" means the value when the natural length is set to 100%.

• "Gel strength" is measured in the following way. In 49.0g of artificial urine (2wt% urea, 0.8wt% sodium chloride, 0.03wt% calcium chloride dihydrate, 0.08wt% magnesium sulfate heptahydrate, and 97.09wt% ion exchange water Mixing) Add 1.0 g of super absorbent polymer, and stir with a blender. The resulting gel was placed in a constant temperature and humidity tank at 40°C×60%RH for 3 hours, then returned to room temperature and measured as a curd meter (curd meter, manufactured by I.techno Engineering: Curdmeter-MAXME-500) To measure the gel strength.

• "Basis weight" is measured in the following way. After pre-drying the sample or test piece, place it in a test room or device in a standard state (the temperature of the test site is 20±5°C, and the relative humidity is below 65%) to make it into a constant weight state. Preliminary drying refers to making the sample or test piece a constant weight in an environment with a relative humidity of 10-25% and a temperature of not more than 50°C. In addition, for fibers with a legal moisture content of 0.0%, preliminary drying is not necessary. Using a template (200mm×250mm, ±2mm) for sample collection, a sample with a size of 200mm×250mm (±2mm) is cut from the test piece in a constant state. Measure the weight of the sample and multiply it by 20 times to calculate the weight per square meter as the basis weight.

• "Thickness" is automatically measured using an automatic thickness measuring device (KES-G5 portable compression tester) under the conditions of a load of 10 gf/cm ² and a pressurized area of 2 cm ² .

‧Water absorption is measured according to JIS K7223-1996 "Test Method for Water Absorption of Super Absorbent Resin".

‧The water absorption speed is the "time to the end point" when JIS K7224-1996 "Test Method for Water Absorption Speed of Super Absorbent Resin" is carried out using 2 g of super absorbent polymer and 50 g of physiological saline.

‧"Expanded state" means the state of flat expansion without contraction or slack.

‧As long as there is no special record, the size of each part refers to the size in the unfolded state, not the size in the natural length state.

‧The "melt viscosity" is tested at the specified temperature in accordance with JIS Z 8803, using Brookfield type B viscometer (spindle number 027).

‧When there is no description of the environmental conditions in the test or measurement, the test or measurement is performed in a laboratory or device under a standard state (the temperature of the test site is 20±5°C, and the relative humidity is below 65%). [Industrial availability]

The present invention can be used for all disposable wearing articles such as pad type disposable diapers, disposable swimsuits, diaper covers, sanitary napkins, etc., in addition to shorts-type disposable diapers or adhesive-type disposable diapers.

11‧‧‧Impermeable sheet 12‧‧‧Exterior body 12A‧‧‧Side seal part 12B‧‧‧Back exterior body 12F‧‧‧Front exterior body 12H‧‧‧Inner sheet 12S‧‧ ‧Outer sheet layer 14‧‧‧Hole 14e‧‧Peripheral 14i‧‧‧Perimeter 18‧‧Unnecessary elastic elastic member 20‧‧‧Mask nonwoven 20H‧‧‧Hot melt adhesive 30‧‧‧ Top sheet 40‧‧‧Middle sheet 50‧‧‧Absorption element 56‧‧‧Absorbent 58‧‧Packing sheet 60‧‧‧Side wrinkles 62‧‧‧Wrinkled non-woven fabric 140‧‧‧Press roller 151‧‧ ‧Perforated non-woven fabric 160‧‧‧Support sheet 170‧‧‧Hot melt applicator 200‧‧‧Inner body 201‧‧‧Internal and external joint A1‧‧‧Non-stretching area A2‧‧‧Stretching area C‧‧‧ Hip mask part L‧‧‧Middle area LD‧‧‧Front and back direction LO‧‧‧Leg opening T‧‧‧Waist area U‧‧‧Lower waist W‧‧‧Waist WD‧‧‧Width direction WO‧‧‧ Waist opening

Fig. 1 is a plan view showing the inner surface of the shorts-type disposable diaper in an unfolded state. Fig. 2 is a plan view showing the outer surface of the shorts-type disposable diaper in an unfolded state. Fig. 3 is a cross-sectional view taken along line 2-2 in Fig. 1. Fig. 4 is a sectional view taken along line 3-3 in Fig. 1. Fig. 5(a) is a sectional view taken along line 4-4 in Fig. 1, and Fig. 5(b) is a sectional view taken along line 5-5 in Fig. 1. Figure 6 is a perspective view of a shorts-type disposable diaper (with holes omitted). Fig. 7 is a plan view showing the outer surface of the inner body in an unfolded state. Fig. 8 is a plan view showing the outer surface of the inner body in the unfolded state together with the outline of the outer body. Fig. 9 is a plan view showing the outer surface of the shorts-type disposable diaper in an unfolded state. Figure 10(a) is a cross-sectional view taken along line 4-4 in Figure 9, and Figure 10(b) is a cross-sectional view taken along line 5-5 in Figure 9. Figures 11(a) and 11(c) are cross-sectional views of the adhesive portion of the mask nonwoven fabric, and Figures 11(b) and 11(d) are plan views of the adhesive portion of the mask nonwoven fabric. Fig. 12 is a cross-sectional view taken along line 2-2 in Fig. 1 showing another form. Fig. 13 is a cross-sectional view taken along line 3-3 in Fig. 1 showing another form. Fig. 14 is a plan view showing the outer surface of the shorts-type disposable diaper in an unfolded state. Figure 15(a) is a cross-sectional view taken along line 4-4 in Figure 14, and Figure 15(b) is a cross-sectional view taken along line 5-5 in Figure 14. Fig. 16 is a plan view showing the inner surface of the sticky disposable diaper in an unfolded state. Fig. 17 is a plan view showing the outer surface of the sticky disposable diaper in an unfolded state. Fig. 18 is a sectional view taken along line 6-6 in Fig. 16. Fig. 19 is a sectional view taken along line 7-7 in Fig. 16. Figure 20(a) is a cross-sectional view along line 8-8 in Figure 16, Figure 20(b) is a cross-sectional view along line 9-9 in Figure 16, Figure 20(c) is a cross-sectional view along line 9-9 in Figure 16 Sectional view taken along line 10-10 in Figure 16. Figure 21 is an enlarged plan view of important parts of the mask non-woven fabric. Figure 22(a) is a perspective view showing the hole of the mask nonwoven fabric, Figure 22(b) is a plan view showing the hole of the mask nonwoven fabric, and Figure 22(c) is along the line in Figure 22(b) Sectional view of line 1-1. Figure 23(a) is a perspective view showing the hole of the mask nonwoven fabric, Figure 23(b) is a plan view showing the hole of the mask nonwoven fabric, and Figure 23(c) is along the line in Figure 23(b) Sectional view of line 1-1. Figure 24(a) is a perspective view showing the holes of the mask nonwoven fabric, Figure 24(b) is a plan view showing the holes of the mask nonwoven fabric, and Figure 24(c) is along the 1- Sectional view of line 1. Figure 25 is a flow chart of the pasting equipment for perforated nonwovens. Fig. 26 is a plan view showing changes when the hot melt adhesive is applied.

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11‧‧‧Impermeable film

14‧‧‧Hole

14e‧‧‧Warpage

14i‧‧‧peripheral part

20‧‧‧Mask non-woven

20H‧‧‧Hot Melt Adhesive

Claims (6)

A disposable wearing article, comprising a perforated nonwoven fabric and a support sheet, the perforated nonwoven fabric is provided with a plurality of holes penetrating the front and back at intervals, the perforated nonwoven fabric is laminated on the support sheet, and the aforementioned perforated nonwoven fabric The support sheet is bonded to the support sheet in a predetermined bonding area by a hot-melt adhesive. The disposable wearing article is characterized in that the bonding area is located at a position closer to the center side than the peripheral edge of the area overlapping the hole The hot-melt adhesive does not exist, and the hot-melt adhesive is present in a continuous plane in areas other than the periphery of the area overlapping with the hole. The density of the hot-melt adhesive around the hole is higher than that The density of the hot melt adhesive in other parts is higher. The disposable wearing article according to claim 1, wherein, in the adhesive region, the hot melt adhesive does not exist in the region overlapping with the hole, and there is in the region other than the region overlapping with the hole The aforementioned hot-melt adhesive in the form of a continuous surface. The disposable wearing article according to claim 1 or 2, wherein the peripheral portion of the hole in the perforated nonwoven fabric becomes a warped portion that is warped toward the support sheet side. The disposable wearing article according to claim 1 or 2, wherein the disposable wearing article is an absorbent article comprising: an absorbent body; a liquid-impermeable sheet that covers the back side of the absorbent body and has air permeability sex; And, the mask non-woven fabric covers the back side of the liquid-impermeable sheet; and the mask non-woven fabric is the perforated non-woven fabric, and the liquid-impermeable sheet is the support sheet. A method for bonding a perforated nonwoven fabric, which laminates a perforated nonwoven fabric and a support sheet, and bonds the perforated nonwoven fabric and the support sheet with a hot melt adhesive in a specified area, and the perforated nonwoven fabric is provided with a plurality of spaces at intervals A hole penetrating the front and back surfaces. The method of bonding the porous nonwoven fabric is characterized in that the hot-melt adhesive is applied to the bonding area on the side of the support sheet in the porous nonwoven fabric without using air After forming a continuous surface, the surface tension of the hot-melt adhesive causes an opening in the center of the portion of the hot-melt adhesive that overlaps the holes of the porous non-woven fabric, and the opening is expanded to that of the porous non-woven fabric. Then, the porous non-woven fabric coated with the hot melt adhesive is laminated on the support sheet for bonding, and the support sheet is not coated with the hot melt adhesive on the surface of the porous non-woven fabric side . The method for sticking a porous nonwoven fabric according to claim 5, wherein the melt viscosity of the hot melt adhesive at a temperature of 140℃ is 3000~2600mPa‧s, and the melt viscosity at a temperature of 160℃ is 1150~1550mPa‧ s, and the temperature when the hot melt adhesive is applied to the porous nonwoven fabric is set to 110-150°C, and the amount of the hot melt adhesive applied to the porous nonwoven fabric is 1.0 to 8.0 g /m ² , the exposure time after applying the hot melt adhesive to the porous nonwoven fabric is set to 0.1 to 1.0 second.

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