JP2006075334A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a break of a back sheet at the root of a locking part by preventing the peeling of a sheet member in a locking part attachment portion. <P>SOLUTION: The back sheet 23 of this disposable diaper 1 is formed by sticking a water-resistant film 232 to a water-repellent non-woven fabric 233 with adhesive 234. The adhesive 234 is applied to the back sheet 23 in such a manner that its coating amount per unit area in the locking part attachment portion 231 is more than that of the other portions. The bonding strength per unit area of the part between the water-resistant film 232 and the water-repellent non-woven fabric 233 in the locking part attachment portion 231 becomes higher than the other. This constitution can prevent the peeling between the water-resistant film 232 and the water-repellent non-woven fabric 233 in the locking part attachment portion 231 so as to prevent the break of the back sheet 23 at the root of the locking part 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an open-type disposable diaper.

  Conventionally, as a disposable diaper of a type (so-called open type) disposable diaper in which a part that abuts on the abdomen and a part that abuts on the back side are fastened and worn around the waist, a liquid-permeable top sheet, a waterproof back An absorbent core formed by a sheet, pulverized pulp or the like and sandwiched between both sheets, and a fastening tape attached to both sides of one end of the backsheet and fastened to the other end when worn Things are used.

In such disposable diapers, in order to improve the feel of the wearer, a sheet having a laminated structure in which a nonwoven fabric is bonded to the outside of a waterproof film is often used as a backsheet. For example, Patent Document 1 discloses an absorbent article including a composite sheet obtained by bonding a liquid-impermeable sheet and a nonwoven fabric with an adhesive as a back material (back sheet), and a method for manufacturing the same.
JP 2002-355272 A

  By the way, in such an open-type disposable diaper, stress is generated at a site where the fastening tape of the back sheet is attached due to the force applied to the fastening tape during wearing. When the back sheet has the laminated structure as described above, the waterproof film and the nonwoven fabric that have been bonded together are peeled off and the strength of the back sheet is reduced, and the back sheet is torn near the attachment site of the fastening tape. There is a risk.

  In addition, in order to prevent peeling between the waterproof film and the nonwoven fabric, if the amount of adhesive applied to join the two is increased on the entire surface of the backsheet, the flexibility of the backsheet will decrease and the disposable diaper will be worn There is a possibility that the comfort of the garment is impaired, or the adhesive oozes out of the back sheet after packing and sticks to other disposable diapers.

  The present invention has been made in view of the above problems, and in an open-type disposable diaper, the peeling of the sheet member at the fastening portion mounting site is prevented to prevent the back sheet from being damaged at the base of the fastening portion. It is aimed.

  The invention according to claim 1 is an open-type disposable diaper in which a part that abuts on the abdomen and a part that abuts on the dorsal side are fastened and worn around the waist, the absorbent core, and the absorbent core A top sheet that covers the main surface on the wearer side, a back sheet that is formed by laminating a plurality of sheet members, and that covers the other main surface of the absorbent core, and one in the longitudinal direction of the back sheet A plurality of fastening portions attached to both sides in the width direction at the end portion of the back sheet, and fastened to the other end portion when worn, wherein the plurality of fastening portions are attached to the fastening portion of the backsheet. The bonding strength per unit area between the sheet members is higher than the bonding strength per unit area between the plurality of sheet members at other portions of the backsheet.

  Invention of Claim 2 is the disposable diaper of Claim 1, Comprising: Bonding | bonding of these sheet | seat members in the said other site | part of the said back sheet | seat was apply | coated between these sheet | seat members Bonding of the plurality of sheet members at the fastening portion attachment site is performed by applying ultrasonic vibration or heat to at least one of the plurality of sheet members and pressing between the plurality of sheet members. It is a joining.

  Invention of Claim 3 is a disposable diaper of Claim 1, Comprising: Joining of these sheet | seat members in the said other site | part of the said back sheet | seat was apply | coated between these sheet members. The bonding of the plurality of sheet members at the fastening portion attachment site is the bonding by the second adhesive having a stronger adhesive force per unit area than the first adhesive.

  Invention of Claim 4 is the disposable diaper of Claim 1, Comprising: Joining of these sheet | seat members in the said other site | part of the said back sheet | seat was apply | coated between these sheet members. The bonding of the plurality of sheet members at the fastening portion attachment site is performed by stacking a second adhesive different from the first adhesive on the first adhesive. Adhesion.

  The invention according to claim 5 is the disposable diaper according to claim 1, wherein the joining of the plurality of sheet members of the back sheet is adhesion by an adhesive applied between the plurality of sheet members. The application amount of the adhesive per unit area in the fastening part attaching part is larger than the application amount per unit area in the other part.

  Invention of Claim 6 is a disposable diaper in any one of Claim 1 thru | or 5, Comprising: The sheet | seat of the outermost layer furthest from the said top sheet among these sheet members of the said back sheet | seat The member is a water-repellent nonwoven fabric, and the other sheet member is a water-resistant film.

  In this invention, peeling of the sheet | seat member in a fastening part attachment site | part can be prevented, and the damage of the back seat | sheet in the base of a fastening part can be prevented. In the invention of claim 2, a plurality of sheet members can be firmly joined at the fastening portion attachment site.

  In the invention of claim 3, the manufacturing process of the back sheet can be simplified. In the invention of claim 4, the difference in adhesive strength can be easily provided while simplifying the manufacturing process of the back sheet. In the invention of claim 5, the manufacturing process of the back sheet can be further simplified.

  In the invention of claim 6, it is possible to improve the feeling of wearing the disposable diaper by preventing the back sheet from being damaged and making the back sheet feel soft.

  FIG. 1 is a plan view showing the configuration of the disposable diaper 1 according to the first embodiment of the present invention. The disposable diaper 1 is an open-type disposable diaper that is worn around a waist around a part that abuts on the abdomen side of the wearer and a part that abuts on the back side. As shown in FIG. 1, the disposable diaper 1 includes a substantially sheet-like main body 2 and a width direction of the main body 2 over almost the entire length in the longitudinal direction of the main body 2 (that is, the Y direction in FIG. 1). A pair of side wall portions 3 provided on both sides (that is, (+ X) side and (−X) side). In FIG. 1, the main surface on the (+ Z) side of the main body 2 is a surface in contact with the wearer.

  A plurality of elastic members 31a and 31b extending in the Y direction are joined to each of the pair of side wall portions 3, and when the disposable diaper 1 is expanded as shown in FIG. 1, the elastic members 31a and 31b are in an expanded state. It has become. In the disposable diaper 1, when the inner elastic member 31a contracts, the inner edge of the side wall 3 rises toward the wearer on the side of the main body 2, and the outer elastic member 31b contracts. A solid gather (a so-called leg gather) is formed in which the outer edge and the lower sheet of the side wall portion 3 rise toward the wearer side and the inner side and abut on the base of the wearer's foot when worn. The side wall 3 is formed of a water-repellent or liquid-impervious nonwoven fabric (for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, an SMS (spunbond / meltblown / spunbond) nonwoven fabric), a plastic film, or a composite material thereof. . From the viewpoint of improving the comfort of the disposable diaper 1, it is preferable that the side wall portion 3 has air permeability.

  The main body 2 includes a liquid-absorbing absorbent core 22 indicated by a thick broken line in FIG. 1, a top sheet 21 covering the main surface of the absorbent core 22 on the wearer side (that is, (+ Z) side), and the absorbent core 22. Back sheet 23 covering the other main surface, and a pair of fastening parts attached to both sides in the width direction at one end in the longitudinal direction of back sheet 23 (that is, (−Y) side end) 24. Hereinafter, the part to which the fastening part 24 of the back sheet 23 is attached, that is, the part near the base of the fastening part 24 of the back sheet 23 is referred to as “fastening part attachment part 231”. When the disposable diaper 1 is worn, the fastening portions 24 are fastened to the end on the (+ Y) side of the backsheet 23 by two hook-and-loop fasteners 241 provided on each of the pair of fastening portions 24.

  FIG. 2 is a cross-sectional view of the disposable diaper 1 cut along a plane perpendicular to the Y direction that crosses the fastening portion attachment portion 231. In FIG. 2, for convenience of illustration, the disposable diaper 1 is shown in an exploded manner, and the adhesive used to form the back sheet 23 is indicated by a broken line (the same applies to FIGS. 3 to 5). The adhesive is indicated by a broken line, an alternate long and short dash line (that is, a line other than a solid line).

  As shown in FIGS. 1 and 2, in the main body 2, the top sheet 21 and the back sheet 23 are joined around the absorbent core 22 by a hot-melt adhesive or the like, and on the side of the absorbent core 22, a pair The fixing portion 24 is attached to the main surface on the (+ Z) side of the back sheet 23 by a hot melt adhesive or the like. In addition, the pair of side wall portions 3 are joined to the main body portion 2 by a hot melt adhesive or the like on the side of the absorbent core 22.

  The top sheet 21 is a non-woven fabric formed of a liquid-permeable material, for example, a hydrophilic fiber, and captures moisture of excrement from the wearer and moves it to the absorbent core 22. Nonwoven fabrics used as the top sheet 21 are, for example, point bond nonwoven fabrics, air-through nonwoven fabrics, and spunlace nonwoven fabrics, and cellulose, rayon, cotton, and the like are usually used as hydrophilic fibers forming these nonwoven fabrics. In addition, as the top sheet 21, a liquid-permeable non-woven fabric formed of hydrophobic fibers (for example, polypropylene, polyethylene, polyester, polyamide, nylon) whose surface is hydrophilically treated with a surfactant may be used. A plastic film having an aperture may be used.

  The absorbent core 22 is obtained by wrapping a hydrophilic fiber (for example, pulverized pulp fiber or cellulose fiber) mixed with a granular water-absorbing polymer (for example, SAP (Super Absorbent Polymer)) with tissue paper or a liquid-permeable sheet. The moisture formed and absorbed through the top sheet 21 is quickly fixed. Tissue paper or the like that wraps hydrophilic fibers prevents the hydrophilic fibers from losing shape and the water-absorbing polymer from falling off.

  As shown in FIG. 2, the back sheet 23 is formed by bonding two sheet members while laminating them. The back sheet 23 is a water-resistant film 232 as a wearer-side sheet member and a water-repellent film as an outer (opposite to the wearer) sheet member (corresponding to the outermost layer farthest from the top sheet 21). A nonwoven fabric 233 is provided. The water-resistant film 232 is a water-repellent or liquid-impervious plastic film, and preferably has breathability from the viewpoint of improving the comfort of the disposable diaper 1. The water repellent nonwoven fabric 233 is, for example, a spunbond nonwoven fabric, a melt blown nonwoven fabric, or an SMS nonwoven fabric, and may be subjected to further water repellent treatment as necessary.

  The water-resistant film 232 and the water-repellent nonwoven fabric 233 are joined by adhesion using an adhesive 234 (shown by a broken line in FIG. 2) applied between the two. The adhesive 234 is preferably a hot-melt adhesive that melts at about 60 ° C. to 180 ° C. from the viewpoint of improving productivity. For example, APAO (Amorphous Poly Alpha Orefin: amorphous polyolefin) is the main component. Polyolefin elastomers, SIS (styrene-isoprene-styrene), SBS (styrene-butadiene-styrene), SIBS (styrene-isoprene-butadiene-styrene), SEBS (styrene-ethylene-butylene-styrene), SEPS (styrene-ethylene) -Propylene-styrene) or other styrene-based elastomers, ethylene / vinyl acetate-based, polyester-based, acrylic-based elastomers, or rubbers such as polyisobutylene, butyl rubber, polyisoprene, and natural rubber Hot melt Wear agent is used. From the viewpoint of improving the flexibility of the back sheet 23, polyolefin-based or styrene-based elastomers and rubber hot-melt adhesives are particularly preferable.

  In addition, the adhesive 234 is applied evenly on the contact surface by discharging the adhesive from the slit-like discharge port of the coater that moves relative to the water-resistant film 232 (or the water-repellent nonwoven fabric 233). Various adhesive patterns can be formed on the water-resistant film 232 by relatively moving the water-resistant film 232 while discharging the adhesive from a coating head or a coating head that is spaced above the water-resistant film 232. It is performed by a forming method or the like. The latter coating methods include dot coating, bead coating, stripe coating, spiral coating, summit coating (a coating method that forms a spiral pattern smaller than spiral coating), melt blow coating (many short fibers) From the viewpoint of improving the flexibility of the back sheet 23, spiral coating, summit coating, or the like, is a coating method in which a shaped adhesive is dropped onto the water-resistant film 232. Melt blow coating is particularly preferred.

  When the water resistant film 232 and the water repellent nonwoven fabric 233 are joined in the manufacturing process of the disposable diaper 1, a single type of adhesive 234 is entirely applied to the joint surface of the water resistant film 232 and / or the water repellent nonwoven fabric 233. Applied. At this time, the application amount per unit area of the adhesive 234 (shown by a thick broken line in FIG. 2) in the fastening part attachment part 231 is other part than the fastening part attachment part 231 of the back sheet 23. The adhesive 234 is applied so as to be larger than the application amount per unit area.

  For this reason, in the disposable diaper 1, the bonding strength per unit area between the water-resistant film 232 and the water-repellent nonwoven fabric 233 at the fastening portion attachment portion 231 is the same as the unit area between the other portions of the backsheet 23. It becomes higher than the bonding strength. Thus, the water-resistant film 232 in the fastening part attachment part 231 at the time of wear is obtained by partially increasing the bonding strength of the back sheet 23 in the fastening part attachment part 231, that is, in the vicinity of the root of the fastening part 24. And the water repellent nonwoven fabric 233 can be prevented from being peeled off, and the back sheet 23 can be prevented from being damaged at the base of the fastening portion 24.

  Note that the difference in the application amount of the adhesive 234 between the fastening portion attachment portion 231 and other portions may be realized by changing the discharge amount of the adhesive 234 from the coating head. It may be realized by recoating only the fastening portion attaching portion 231 in a state in which is kept constant. Alternatively, a difference in the application amount may be provided by changing the application method of the adhesive 234 between the fastening part attaching part 231 and another part.

  Moreover, in the back sheet 23, other parts other than the fastening part attaching part 231 do not necessarily have to be adhered to the entire surface, and only a part may be appropriately adhered. In this case, the bonding strength per unit area of the other portion compared with the fastening portion mounting portion 231 indicates an average adhesive strength (the same applies to the following embodiments).

  In the disposable diaper 1, the manufacturing process of the back sheet 23 can be simplified by joining the fastening part attaching part 231 and the other part of the back sheet 23 by the same joining method of adhesion with an adhesive ( In other words, a difference in bonding strength can be easily provided.) Furthermore, since the adhesive used when joining the fastening portion attachment portion 231 and other portions is a single type, the manufacturing process of the backsheet 23 can be further simplified. Further, the back sheet 23 is provided with a water-resistant film 232 on the wearer side, and the outermost sheet member is a water-repellent nonwoven fabric 233, so that the back sheet 23 is prevented from being damaged and the touch of the back sheet 23 is made of cloth. Thus, it can be made flexible (smooth) and the wearing feeling of the disposable diaper 1 can be improved.

  FIG. 3 is a cross-sectional view of the fastening part attaching portion 231 of the disposable diaper 1a according to the second embodiment. In the disposable diaper 1a, the method of joining the water-resistant film 232 of the back sheet 23 and the water-repellent nonwoven fabric 233 is different from that of the first embodiment, but the configuration of the disposable diaper 1a is the same as that of the disposable diaper 1 shown in FIG. The same reference numerals are used in the following description and drawings (the same applies to the following embodiments).

  In the disposable diaper 1a, when the water-resistant film 232 and the water-repellent nonwoven fabric 233 are joined, the joint surface of the water-resistant film 232 and / or the water-repellent nonwoven fabric 233 is other than the fastening portion attachment portion 231. An adhesive 234 is applied to a part corresponding to the part, and another type of adhesive 235 (hereinafter referred to as two adhesives) having a stronger adhesive force per unit area than the adhesive 234 is applied to the part corresponding to the fastening portion attaching part 231. In order to distinguish these, “first adhesive 234” and “second adhesive 235”) are applied. And the water-resistant film 232 and the water-repellent nonwoven fabric 233 are laminated | stacked, and it joins strongly with the 2nd adhesive agent 235 in the fixing | fixed part attachment part 231 of the backsheet 23, and unit area is compared with the 2nd adhesive agent 235 in another part. The first adhesive 234 having a weak adhesive strength is joined.

  For this reason, in the disposable diaper 1a, as in the first embodiment, the bonding strength per unit area between the water-resistant film 232 and the water-repellent nonwoven fabric 233 at the fastening portion attachment site 231 is It becomes higher than the joint strength per unit area between both in other parts. As a result, it is possible to prevent the water-resistant film 232 and the water-repellent nonwoven fabric 233 from being peeled off at the fastening part attaching portion 231 and to prevent the back sheet 23 from being damaged at the root of the fastening part 24.

  In the disposable diaper 1a, the manufacturing process of the back sheet 23 can be simplified by joining the fastening portion attaching part 231 and the other part of the back sheet 23 by the same joining method of bonding with an adhesive. Similarly to the first embodiment, the back sheet 23 is provided with a water-resistant film 232 on the wearer side and the water-repellent nonwoven fabric 233 is used as the outermost layer sheet member while preventing the back sheet 23 from being damaged. The feeling of wearing can be improved by making the skin soft. In the other embodiments described below, the above-described effects of preventing damage to the back sheet 23, simplifying the manufacturing process, and improving the wearing feeling are similarly realized.

  FIG. 4 is a cross-sectional view of the fastening part attaching portion 231 of the disposable diaper 1b according to the third embodiment. In the disposable diaper 1b, the first adhesive 234 is applied to the entire joint surface of the water-resistant film 232 and / or the water-repellent nonwoven fabric 233, and the first adhesive 234 is different from the first adhesive 234 in a portion corresponding to the fastening portion attachment portion 231. Another adhesive 236 (hereinafter referred to as “third adhesive 236”) is applied over the first adhesive 234. Then, the water-resistant film 232 and the water-repellent nonwoven fabric 233 are laminated, joined at the fastening portion attaching portion 231 of the back sheet 23 by the first adhesive 234 and the third adhesive 236, and at the other portions, the first portion. Bonded with an adhesive 234.

  In the disposable diaper 1b, in the formation of the back sheet 23, the third adhesive 236 is applied only on the fastening part attaching part 231 while widely using the first adhesive 234, and the fastening part attaching part 231 and others are applied. Are bonded by the same bonding method of bonding with an adhesive, thereby simplifying the manufacturing process of the back sheet 23 and easily providing a difference in bonding strength between the fastening portion mounting portion 231 and other portions. be able to. Note that the third adhesive 236 is preferably an adhesive having a stronger adhesive force per unit area than the first adhesive 234 from the viewpoint of easily providing a difference in adhesive strength.

  FIG. 5 is a cross-sectional view of the fastening part attaching portion 231 of the disposable diaper 1c according to the fourth embodiment. In the disposable diaper 1c, when the water-resistant film 232 and the water-repellent nonwoven fabric 233 are joined, the joint surface of the water-resistant film 232 and / or the water-repellent nonwoven fabric 233 is other than the fastening portion attachment portion 231. After the adhesive 234 is applied to the part corresponding to the part, the water-resistant film 232 and the water-repellent nonwoven fabric 233 are laminated and joined by the adhesive 234. Subsequently, a bonding head that imparts ultrasonic vibration abuts on a portion corresponding to the fastening portion attachment portion 231 of the water resistant film 232 (may contact the water repellent nonwoven fabric 233 side), and the water resistant film 232 is contacted. By pressing against the water-repellent nonwoven fabric 233 while applying ultrasonic vibration, the water-resistant film 232 and the water-repellent nonwoven fabric 233 are joined (so-called ultrasonic joining) at the fastening portion attachment portion 231.

  In the disposable diaper 1c, in the formation of the back sheet 23, the water-resistant film 232 and the water-repellent nonwoven fabric 233 can be more firmly joined by joining the fastening portion attaching portion 231 by ultrasonic joining. In the disposable diaper 1c, in joining the water-resistant film 232 and the water-repellent nonwoven fabric 233 in the fastening portion attaching portion 231, joining with heat application and pressing (so-called heat sealing) is performed instead of ultrasonic joining. It may be done.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment, A various change is possible. For example, the bonding method of the fastening portion 24 to the back sheet 23 is not necessarily limited to bonding with an adhesive such as a hot melt adhesive, and may be ultrasonic bonding or heat sealing. Further, the fastening portion 24 may be joined to the main surface (that is, the water-repellent nonwoven fabric 233) on the (−Z) side of the backsheet 23, and is sandwiched between the water-resistant film 232 and the water-repellent nonwoven fabric 233. May be joined together.

  In the back sheet 23, when the fastening portion attaching portion 231 and other portions are bonded by a single type of adhesive 234 as in the first embodiment, the adhesive 234 is applied per unit area of both portions. By changing the application method while keeping the same amount, the bonding strength per unit area in the fastening portion attaching portion 231 may be made higher than that of other portions. For example, the adhesive 234 is applied to the fastening portion attaching portion 231 by a coating method such as coater coating or bead coating that increases the bonding strength, and is applied to other portions by other coating methods. Thereby, peeling with the water-resistant film 232 and the water-repellent nonwoven fabric 233 in the fastening part attachment site 231 can be effectively prevented.

  Further, in the second embodiment, when the second adhesive 235 having a stronger adhesive force per unit area than the first adhesive 234 is applied to the fastening portion attaching portion 231, the second adhesive 235 is applied. The coating strength and the bead coating in the same manner as described above can further increase the bonding strength between the water-resistant film 232 and the water-repellent nonwoven fabric 233 at the fastening portion attachment portion 231.

  The method of joining other parts other than the fastening part attaching part 231 of the back sheet 23 is not necessarily limited to the adhesion by the (first) adhesive 234. For example, the fastening part attaching part 231 and other parts may be joined by ultrasonic bonding. In this case, the fastening part attaching part 231 may be joined so that the joining strength per unit area in the fastening part attaching part 231 is higher than the other parts. Conditions for applying ultrasonic vibration are changed between the attachment portion 231 and other portions.

  The back sheet 23 may be a composite sheet in which a plurality of sheet members are laminated, and is not necessarily limited to a two-layer structure including the water resistant film 232 and the water repellent nonwoven fabric 233. For example, a liquid-absorbing sheet member containing a superabsorbent material such as SAP or SAF (Super Absorbent Fiber) may be provided on the wearer side of the water-resistant film 232. A hydrophilic nonwoven fabric may be provided on the wearer side.

  In the disposable diaper according to the above-described embodiment, the nonwoven fabric manufactured by various manufacturing methods such as the spunlace method, the needle punch method, the thermal bond method, the spunbond method, the chemical bond method, the air-through method, the top sheet 21 and the side wall portion. 3 can be used.

It is a top view which shows the structure of the disposable diaper which concerns on 1st Embodiment. It is sectional drawing of a disposable diaper. It is sectional drawing of the disposable diaper which concerns on 2nd Embodiment. It is sectional drawing of the disposable diaper which concerns on 3rd Embodiment. It is sectional drawing of the disposable diaper which concerns on 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a-1c Disposable diaper 21 Top sheet 22 Absorption core 23 Back sheet 24 Fastening part 231 Fastening part attachment part 232 Water-resistant film 233 Water-repellent nonwoven fabric 234 (1st) adhesive 235 2nd adhesive 236 3rd adhesion Agent

Claims (6)

An open-type disposable diaper that is worn around the waist around the part that contacts the ventral side and the part that contacts the back side,
An absorbent core;
A top sheet covering the main surface of the absorbent core on the wearer side;
A back sheet that is formed by bonding together while laminating a plurality of sheet members, covering the other main surface of the absorbent core
A fastening part that is attached to both sides in the width direction at one end in the longitudinal direction of the backsheet, and fastened to the other end when worn,
With
The bonding strength per unit area between the plurality of sheet members at the fastening portion mounting portion to which the fastening portion of the backsheet is attached is per unit area between the plurality of sheet members at other portions of the backsheet. Disposable diaper characterized by higher than the bonding strength of. The disposable diaper according to claim 1,
Bonding of the plurality of sheet members in the other part of the backsheet is adhesion by an adhesive applied between the plurality of sheet members,
The joining of the plurality of sheet members at the fastening portion attachment site is joining involving application of ultrasonic vibration or heat to at least one of the plurality of sheet members and pressing between the plurality of sheet members. Disposable diaper featuring. The disposable diaper according to claim 1,
Bonding of the plurality of sheet members at the other part of the backsheet is adhesion by a first adhesive applied between the plurality of sheet members,
The disposable diaper characterized in that the joining of the plurality of sheet members at the fastening portion attachment site is adhesion by a second adhesive having a stronger adhesive force per unit area than the first adhesive. The disposable diaper according to claim 1,
Bonding of the plurality of sheet members at the other part of the backsheet is adhesion by a first adhesive applied between the plurality of sheet members,
The joining of the plurality of sheet members at the fastening portion attachment site is an adhesion in which a second adhesive different from the first adhesive is stacked on the first adhesive. Disposable diapers. The disposable diaper according to claim 1,
Bonding of the plurality of sheet members of the back sheet is adhesion by an adhesive applied between the plurality of sheet members,
The disposable diaper characterized in that the application amount of the adhesive per unit area in the fastening part attaching portion is larger than the application amount per unit area in the other portion. The disposable diaper according to any one of claims 1 to 5,
Disposal characterized in that, among the plurality of sheet members of the back sheet, the outermost sheet member that is farthest from the top sheet is a water-repellent nonwoven fabric, and the other sheet member is a water-resistant film. Diapers.

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