JP2022114648A - absorbent article - Google Patents

Abstract

To fix wing-like flaps to an underwear firmly and to remove them from the underwear easily.SOLUTION: Provided is a sanitary napkin 1 in which a pair of right and left wing-like flaps W and W, in the state of being attached to an underwear S, is folded back in a width direction, and an overlapping part 9 where tip parts overlap each other is formed on an outer surface of a crotch part of the underwear S. The wing-like flap W comprises a body part adhesive layer 10 that is bonded to an outer surface of the underwear S, and a tip part adhesive layer 11, where the tip parts of the wing-like flap W are bonded to each other, in the overlapping part 9. The adhesive strength of the tip part adhesive layer 11 is smaller than the adhesive strength of the body part adhesive layer 10. The body part adhesive layer 10 is provided in an application pattern in which an adhesive is applied to the entire surface of a prescribed region, and the tip part adhesive layer 11 is provided in an application pattern in which an adhesive is intermittently applied to the prescribed region.SELECTED DRAWING: Figure 3

Description

The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing bodily fluids such as menstrual blood, vaginal discharge, and urine. To provide an absorbent article in which shaped flaps are folded back in the width direction so as to wrap both side edges of a crotch portion of an underwear, and are arranged so that tip portions overlap each other on the outer surface of the crotch portion of the underwear.

Conventionally, a pair of left and right wing-shaped flaps extending outward are formed on both sides of a body portion in which an absorbent body is interposed between a liquid-impermeable back sheet and a liquid-permeable top sheet. Absorbent articles are known. In order to fix the absorbent article provided with the wing-shaped flaps to the underwear, the wing-shaped flaps protruding sideways are taken out from the underwear, and the left and right wing-shaped flaps are folded back toward the back sheet side at the base ends, and then the wing-shaped flaps are attached to the underwear. The pressure-sensitive adhesive layer provided on the wing-shaped flaps is adhered to the outer surface of the crotch part of the undergarment while winding the crotch part.

As the pressure-sensitive adhesive layer provided on the wing-shaped flaps, Patent Document 1 below describes a first region having a relatively long width-direction length and a short length-direction length of the absorbent article, and the first region having a relatively short length in the longitudinal direction. and a second region having a relatively short widthwise length and a long longitudinal length of the absorbent article, wherein the first region and the second region are adjacent to each other with a gap therebetween. By displacing the front end of the first region to the rear side of the absorbent article relative to the front end of the second region, the wing-shaped flaps are positioned closer to the front base end. It is disclosed that the region is a non-slip region where the wing anti-slip adhesive layer is not formed.

Further, Patent Document 2 below discloses a pair of first and second wings that overlap each other when attached to underwear, and the first wing includes a tear guide portion extending in the front-rear direction and a tear-inducing portion extending in the width direction. and an outer wing joint positioned outboard of the tear guide, and the first wing has an inner wing joint positioned inboard of the tear guide in the width direction.

Japanese Patent No. 6071308 Japanese Patent No. 6146783

In the conventional absorbent article described in Patent Document 1, the wing-shaped flaps that are folded back to the outside of the crotch portion of the undergarment when worn are fixed to the outer surface of the undergarment with an adhesive layer that is placed substantially in the center. As a result, the tip that is not fixed to the underwear bends, protrudes outward, or flutters when worn, making it uncomfortable to wear and gradually peeling off from the end of the adhesive layer. was occurring.

For this reason, as described in Patent Document 2, the tip portions of the wing-shaped flaps are overlapped with each other when the underwear is worn, and an adhesive layer is provided to join the wing-shaped flaps at the overlapped portion. something exists. In such an absorbent article, since the tips of the wing-shaped flaps are joined to each other in the worn state, the tips of the wing-shaped flaps do not bend or flutter, thereby solving the above problem.

However, when removing the used absorbent article from the underwear, since the tips of the wing-shaped flaps are joined together, it takes time and effort to peel them off. In some cases, the part of the wing-shaped flap is torn off and remains in the underwear, and it is troublesome to remove the remaining piece of the wing-shaped flap from the underwear.

Therefore, the main object of the present invention is to provide an absorbent article provided with an adhesive layer in the overlapped portion where the tips of a pair of left and right wing-shaped flaps overlap each other when worn, in which the wing-shaped flaps can be firmly fixed to underwear. To provide an absorbent article which can be easily removed from undergarments.

In order to solve the above-mentioned problems, as a first mode, a pair of left and right wing-shaped flaps are folded back in the width direction in a state in which the undergarment is worn, and an overlapping portion is formed in which the tip portions overlap each other on the outer surface of the crotch portion of the undergarment. An absorbent article comprising:
The wing-shaped flap includes a main body adhesive layer that bonds to the outer surface of the underwear, and a tip adhesive layer that joins the tips of the wing-shaped flaps in the overlapping portion,
The absorbent article is characterized in that the adhesive force of the tip adhesive layer is smaller than the adhesive force of the body adhesive layer.

In the first aspect, since the overlapping portion is provided with a tip portion adhesive layer that joins the tip portions of the wing-shaped flaps, the tip portions of the wing-shaped flaps bend or flutter when attached. The wing-shaped flaps can be firmly fixed to the underwear because the pressure-sensitive adhesive layer on the main body portion is less likely to peel off, while the adhesive layer on the main body portion is less likely to peel off.

In addition, since the adhesive strength of the tip adhesive layer is less than that of the main body adhesive layer, the wing-shaped flaps can be firmly fixed to the underwear by the main body adhesive layer when worn, and the used underwear can also be used. When removing the absorbent article from the underwear, the tip adhesive layer that joins the tips of the wing-shaped flaps can be easily peeled off, and the absorbent article can be easily removed without tearing off the wing-shaped flaps. be able to.

As a second aspect, the main body adhesive layer is provided in a coating pattern in which an adhesive is applied to the entire surface of a predetermined area,
2. The absorbent article according to claim 1, wherein the tip adhesive layer is provided in a coating pattern in which the adhesive is intermittently applied to predetermined regions.

In the second aspect, the application pattern of the adhesive forming the main body adhesive layer is solid, and the application pattern of the adhesive forming the tip adhesive layer is an intermittent pattern. The wing-shaped flaps can be firmly fixed to the underwear by the solid body adhesive layer, and can be easily removed by the intermittent pattern tip adhesive layer.

As a third aspect, there is provided the absorbent article according to any one of claims 1 and 2, wherein the adhesive strength of the tip adhesive layer is 20 to 60% of the adhesive strength of the body adhesive layer. be done.

In the third aspect, the ratio between the adhesive strength of the tip adhesive layer and the adhesive strength of the main body adhesive layer is specifically defined.

As a fourth aspect, the absorbent according to any one of claims 1 to 3, wherein the tip adhesive layer is provided at a position separated from the tip of the wing-shaped flap by 0 to 10 mm in the width direction of the absorbent article. A sexual item is provided.

In the fourth aspect, the tip of the wing-shaped flap can be more reliably prevented from bending or fluttering at the time of attachment by specifically defining the position where the tip adhesive layer is provided. ing.

As a fifth mode, the body portion pressure-sensitive adhesive layer is provided at a position separated from the base end portion of the wing-shaped flap in the width direction of the absorbent article by 5 to 20 mm. of absorbent articles are provided.

In the fifth aspect, the wing-shaped flaps can be more reliably fixed to the underwear by specifically defining the positions where the body portion adhesive is provided.

As described in detail above, according to the present invention, the wing-shaped flaps can be firmly fixed to the undergarment, and the absorbent article can be easily removed from the undergarment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially broken development view of the sanitary napkin 1 which concerns on this invention. FIG. 2 is a view taken along line II-II of FIG. 1; Fig. 2 is a plan view of the outer surface of the crotch portion when the sanitary napkin 1 is attached to the underwear S; FIG. 3 is a plan view showing a coating pattern of the tip adhesive layer 11. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 and 2, a sanitary napkin 1 according to the present invention comprises a liquid-impermeable back sheet 2 made of a polyethylene sheet, a polypropylene sheet, or the like, and a back sheet 2 through which menstrual blood, vaginal discharge, or the like can quickly permeate. A liquid-permeable surface sheet 3, an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2, 3, and an absorbent body 4 on both sides of the skin-contacting surface over substantially the entire length in the front-rear direction. At the upper and lower edges of the absorber 4, the outer edges of the backsheet 2 and the topsheet 3 are coated with an adhesive such as hot melt or heat. The back sheet 2 and the side sheets 7, which are joined by a joining means such as a seal or an ultrasonic seal and extend laterally beyond the absorbent body 4 at both side edges thereof, are coated with an adhesive such as a hot melt or the like. A flap portion is formed in which the absorber 4 is not interposed and is joined by a joining means such as heat sealing or ultrasonic sealing. In addition, in order to maintain the shape of the absorbent body 4 and improve the diffusibility, the absorbent body 4 may be surrounded by a wrapping sheet made of crepe paper or non-woven fabric. A second sheet having substantially the same shape as the topsheet 3 may be arranged between the topsheet 3 and the absorbent body 4 and adjacent to the non-skin side of the topsheet 3 .

The structure of the sanitary napkin 1 will be further detailed below.
As the back sheet 2, a sheet material having at least water impermeability, such as an olefin resin sheet such as polyethylene or polypropylene, is used. A non-woven fabric sheet (in this case, the waterproof film and the non-woven fabric form the back sheet 2) or the like can be used after ensuring substantially liquid impermeability. In recent years, there is a tendency to use moisture-permeable materials from the viewpoint of preventing stuffiness. This water-impervious/moisture-permeable sheet material is a microporous sheet obtained by melting and kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. is.

Next, nonwoven fabric is preferably used for the surface sheet 3 . Examples of the material fibers that make up the nonwoven fabric include synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spunbond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in flexibility, the spunbond method is superior in drapeability, and the thermal bonding method and the air-through method are superior in bulkiness and compression recovery. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can be used.

The absorbent body 4 interposed between the backsheet 2 and the topsheet 3 is made of, for example, flocculent pulp and superabsorbent polymer. As the superabsorbent polymer, superabsorbent polymer granular powder (SAP) and superabsorbent polymer fiber (SAF) can be used. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp with a longer fiber length is more functional and functional than hardwood pulp. It is preferably used in terms of price. As for the manufacturing method of the absorbent body 4, it is desirable that the fiber piled pulp is used so as to be rich in flexibility, but an air-laid absorbent body that can reduce the volume may be used. The absorbent body 4 may be surrounded by an enveloping sheet (not shown) made of crepe paper, non-woven fabric, or the like in order to retain its shape and improve diffusion.

Synthetic fibers may also be mixed in the absorber 4 . Examples of the synthetic fibers include polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof. A mixture may also be used. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a high-melting-point fiber as a core and a low-melting-point fiber as a sheath can also be used.

In the illustrated example, the width dimension of the topsheet 3 is slightly longer than the width of the absorbent body 4, as shown in the cross-sectional view of FIG. A side sheet 7 separate from the top sheet 3 is provided with an appropriate water-repellent treatment or treatment according to the purpose of preventing the penetration of menstrual blood or vaginal discharge, or improving the feel of the skin. A side sheet 7 is provided which is made of a hydrophilic treated nonwoven fabric material. The side sheet 7 may be made of natural fiber, synthetic fiber, regenerated fiber, or the like, and may be formed by an appropriate processing method. For this reason, it is preferable to use a nonwoven fabric with a reduced basis weight and air permeability. Specifically, it is desirable to use a non-woven fabric with a basis weight of 13 to 23 g/m ² , and in order to reliably prevent permeation of body fluids, silicone-based, paraffin-based, alkylchromic chloride-based water repellents, etc. A water-repellent nonwoven fabric coated with is preferably used.

As shown in FIG. 2, the side sheets 7 are bonded with an adhesive such as hot-melt over a range from a predetermined inner position to the outer edge of the back sheet 2 from the widthwise intermediate portion to the outer edge of the back sheet 2. Laminated sheet portions of the sheet 7 and the back sheet 2 form side flap portions on both sides of the absorbent body 4 in which the absorbent body 4 is not interposed.

The side flap portions are a pair of left and right wing-shaped flap portions, which are located at side portions substantially corresponding to the bodily fluid discharge portion H of the wearer and extend from the side edges of the absorbent body 4 more than the front and rear portions thereof. W, forming W. The wing-shaped flap portions W, W (the outer surface side of the backsheet 2) are each provided with an adhesive layer as will be described in detail later. The wing-shaped flap portions W, W are folded back to the opposite side (back sheet 2 side) at the folding line RL (see FIG. 1) of the base end portion, and wrapped around the crotch portion of the underwear S to be fastened. ing. In addition, as shown in FIG. A plurality of adhesive layers 8, 8, . By bonding the adhesive layers 8, 8 to the inner surface of the crotch portion of the underwear, the body portion of the sanitary napkin 1 is fixed to the underwear.

On the other hand, the inner side portion of the side sheet 7 is joined to the top sheet 3 while being laminated on the skin side of the top sheet 3 in the illustrated embodiment. is folded almost double, and one or a plurality of thread-like elastic elastic members (not shown) fixed at both ends or at appropriate positions in the longitudinal direction are placed in the middle portion in the longitudinal direction inside the double sheet in a stretched state. By arranging with , the arrangement range of the thread-like elastic stretchable member in the longitudinal direction intermediate portion may form a three-dimensional gather that stands up on the skin side due to the contractile force of the thread-like elastic stretchable member.

[Wing flap W]
As shown in FIG. 3, the wing-shaped flaps W, W are folded back in the width direction at the folding line RL in a state of being attached to the undergarment S, and the tips of the flaps W are folded back to each other on the outer surface of the crotch portion of the undergarment S. Overlapping overlapping portions 9 are formed. Folding lines RL, which are folding base ends of the wing-shaped flaps W, are formed between the bottoms of concave portions recessed in the width direction of the napkin connected to the outline of the napkin main body portion on the front side and the rear side of the wing-shaped flaps W, respectively. It is a longitudinal line connecting the front and back direction of the sanitary napkin 1 . The length in the width direction of the napkin from the folding line RL to the tip of the wing-shaped flap W is larger than 1/2 of the length in the width direction of the napkin between the left and right folding lines RL, RL. As a result, when the left and right wing-shaped flaps W, W are folded back along the folding line RL in the width direction while the underwear S is worn, the tip portions of the left and right wing-shaped flaps W, W meet the crotch portion of the underwear S. Overlapping portions 9 overlapping each other on the outer surface are formed. As shown in FIG. 3, the length L of the overlapping portion 9 in the napkin width direction is 10 to 40 mm, preferably 10 to 20 mm. As shown in FIG. 1, the tips of the wing-shaped flaps W refer to the longitudinal range where the wing-shaped flaps W are formed when the left and right wing-shaped flaps W are deployed on both sides. This is the point on the outline of the wing-shaped flap W at the position where the length in the width direction of the napkin is maximum.

The plane shape of the wing-shaped flaps W can be formed in any shape such as trapezoidal or triangular, but as shown in FIG. The outer shape may be composed of a rear contour line 21 extending outward from the portion and a distal contour line 22 connecting the front contour line 20 and the rear contour line 21 . The boundary points of the front side outline 20, the rear side outline 21, and the tip side outline 22 are the scribing points when a scribing curve connecting adjacent outlines is introduced as in the example of this illustration. It is the midpoint of the curve.

The front contour line 20 is a wavy line formed by repeating outwardly protruding convex portions and inwardly protruding concave portions. Specifically, outward from the connection point where the front outline 20 of the wing-shaped flap W connects to the body of the sanitary napkin 1, the first concave portion 20a, the first convex portion 20b, the second The wave-like front outline 20 is formed by the two concave portions 20c and the second convex portions 20d.

On the other hand, as shown in FIG. 1, the rear contour line 21 has a rubbing curve formed at the end for connection to the adjacent contour lines (the tip side contour line 22 and the napkin main body contour line). The intermediate part excluding the part is a straight line, but the intermediate part excluding the curved line part formed at the end for connection to the adjacent outline should be an arcuate line that bulges outward. is also possible.

By making the wing-like flaps W have the outer shape as described above, the wing-like flaps W can be folded back and pasted easily and precisely at the regular folding position without causing problems such as adhesion of the adhesive to each other or erroneous adhesion. It is possible to bring advantages such as being able to

[Adhesive Layer Provided on Wing-shaped Flap W]
The adhesive layer provided on the wing-shaped flap W will be described in detail below. The wing-shaped flap W includes a main body adhesive layer 10 that bonds to the outer surface of the undergarment S, and a tip adhesive layer 11 that bonds the tips of the wing-shaped flaps W at the overlapping portion 9. . The adhesive force of the tip adhesive layer 11 is made smaller than the adhesive force of the main body adhesive layer 10 . That is, there is a relationship of the adhesive force of the tip adhesive layer 11 <the adhesive force of the main body adhesive layer 10 .

In this way, since the tip end adhesive layer 11 that joins the tip end portions of the wing-shaped flaps W is provided in the overlapped portion 9 of the wing-shaped flaps W, the tip end portions of the wing-shaped flaps W may be bent when attached. , fluttering can be prevented, a good feeling of wearing can be maintained, and peeling of the main body adhesive layer 10 due to the tip portion of the wing-shaped flap W being turned up is less likely to occur, so that the wing-shaped flap W can be firmly fixed to the underwear S.

In addition, since the adhesive force of the tip adhesive layer 11 is made smaller than the adhesive force of the main adhesive layer 10, the wing-shaped flap W is firmly fixed to the undergarment S by the main adhesive layer 10 when worn. In addition, when the used sanitary napkin is removed from the underwear S, the tip adhesive layer 11 joining the tips of the wing-shaped flaps W can be easily peeled off, and the wing-shaped flaps W can be torn off. The sanitary napkin 1 can be easily removed without removing the sanitary napkin.

In order to make the adhesive force of the tip adhesive layer 11 smaller than the adhesive force of the main body adhesive layer 10, there are means such as using an adhesive with a small adhesive force and reducing the application area of the adhesive. Desirably, this is achieved by changing the application pattern of the adhesive as described below. As a result, the same adhesive can be used for the main body adhesive layer 10 and the tip adhesive layer 11, so that the cost of materials can be reduced and the adhesive arrangement area of the tip adhesive layer 11 can be enlarged to some extent. large areas can be bonded.

The main body adhesive layer 10 is preferably provided in an application pattern in which an adhesive is applied to the entire surface of a predetermined area. That is, a band-shaped or rectangular adhesive-applied area having a predetermined width is coated with the adhesive by a slot coater, a roll coater, or the like. As a result, the wing-shaped flaps W can be firmly fixed to the outer surface of the crotch portion of the undergarment S.

On the other hand, as shown in FIG. 4, the tip adhesive layer 11 is provided in a coating pattern in which an adhesive is intermittently applied to a predetermined area 12 . That is, a continuous linear adhesive such as (A) a spiral pattern, (B) an omega pattern, or a chain pattern in which a large number of rings are connected and arranged, is applied to the band-shaped or rectangular adhesive application area 12 having a predetermined width. An intermittent pattern in which the agent-applied portions are spaced apart from each other is preferred. This intermittent pattern is a pattern in which an adhesive-applied portion and a non-applied portion exist in the predetermined region 12, and the adhesive-applied portion accounts for 70% or less, preferably 10 to 10% of the area of the predetermined region 12. 70%, more preferably 20-60%. As a result, the adhesive strength of the tip adhesive layer 11 can be made smaller than the adhesive strength of the main body adhesive layer 10 more reliably, and the tip adhesive layer 11 can be easily peeled off.

The application pattern of the tip adhesive layer 11 will be described in more detail. As shown in FIGS. It is preferable that only one portion is provided at each of the rear end portion and the rear end portion, and the end portion of the adhesive application portion is not present at the intermediate portion. By applying the adhesive in such an application pattern, when the tip adhesive layer 11 is peeled off to remove the sanitary napkin 1, the adhesive is peeled off from the end 11a of the adhesive-applied portion, and the adhesive is applied to an unintended portion. can be prevented from remaining. Also, in the sense of completely eliminating the end portion, as shown in FIG. 4C, a chain pattern in which the annular application portions are partially overlapped and connected while being shifted in the front-rear direction.

The adhesive strength of the tip adhesive layer 11 is preferably 20 to 60%, preferably 45 to 55%, and more preferably about 50% of the adhesive strength of the main body adhesive layer 10 . If it is less than 20%, the adhesive strength of the tip adhesive layer 11 is too small, and the joining of the tips of the wing-shaped flaps W, W is likely to be released during attachment, and the tip of the wing-shaped flap W may be bent. inconvenience is likely to occur. On the other hand, if it is more than 60%, the adhesive force between the tips of the wing-shaped flaps W is too large, and when the sanitary napkin 1 is removed from the underwear S, the tips of the wing-shaped flaps W are likely to be torn off.

The adhesive strength of the main body adhesive layer 10 can be, for example, 5.0 N or more, and the adhesive strength of the tip adhesive layer 11 can be, for example, 3.0 N or less. The adhesive force is obtained by laminating the wing-shaped flaps W having the respective adhesive layers 10 and 11 on the outer surface of the underwear S, reciprocating the outer surface of the flaps W with a roller of 2 kg, and then bonding the underwear S and the sanitary napkin 1 to each other. It is obtained from the maximum load when the tip of the wire is held and pulled at a speed of 1000 mm/min using a tensile tester.

The position where the main body adhesive layer 10 is arranged is a region of the wing-shaped flap W other than the overlapping portion 9, and is bonded to the outer surface of the undergarment S in a state where the sanitary napkin 1 is attached to the undergarment S. possible area.

As shown in FIG. 1, the position of the main body adhesive layer 10 in the width direction of the sanitary napkin 1 is such that the separation distance A in the width direction of the sanitary napkin 1 is 5 from the base end of the wing-shaped flap W. It is preferable that the length is up to 20 mm and that the position does not overlap with the overlapping portion 9 . That is, it is arranged at a position separated by a predetermined distance A from the folding line RL of the proximal end portion of the wing-shaped flap W. As shown in FIG. If the separation distance A is less than 5 mm, it becomes difficult to fix the wing-shaped flap W to the outer surface of the crotch portion of the undergarment S when it is folded back. If the separation distance A is more than 20 mm, the wing-shaped flaps W near the roots of the legs will not be fixed to the underwear, so that wrinkles and twists are likely to occur. Moreover, when the wing-shaped flap W overlaps with the overlapping portion 9, it becomes difficult to peel off the tip portion of the wing-shaped flap W when the wing-shaped flap W is removed.

Also, as shown in FIG. 1, the main body adhesive layer 10 is arranged in a region on the proximal side from the longitudinal center line M that bisects the wing-shaped flaps W in the width direction of the sanitary napkin 1. is good. In the region on the tip side of the longitudinal center line M, the tip portions of the wing-shaped flaps W are joined to each other by the tip adhesive layer 11 in the overlapping portion 9, and if necessary, in the overlapping portion 9 Since the tip adhesive layer 11 provided on the wing-shaped flap W laminated on the undergarment S side is joined to the undergarment S, the undergarment S is fixed with a certain amount of adhesive force and separated from the base of the leg. Since it is less likely to be affected by the movement of the legs when worn, there is no need for strong bonding by the main body adhesive layer 10. Rather, the main body adhesive layer is used to facilitate removal of the wing-shaped flaps W from the undergarment S. Preferably, the agent layer 10 is not provided. On the other hand, the area on the base end side of the longitudinal center line M is susceptible to the movement of the leg when worn, and the wing-shaped flap W is likely to wrinkle or twist. In order to maintain the state of being fixed to the outer surface of the undergarment S even if it is deformed, it is necessary to firmly fix it with the main body adhesive layer 10 .

As shown in FIG. 1, when the front contour line 20 of the wing-shaped flap W is a wavy line, the pressure-sensitive adhesive layer 10 of the body part is formed on the innermost first recessed part 20a and on the outside thereof. It is preferable to arrange it between the second concave portion 20c located there. That is, the main body pressure-sensitive adhesive layer 10 is arranged between the bottoms of the first recessed portion 20a and the second recessed portion 20c that are most recessed in the longitudinal direction of the napkin. As a result, the main body pressure-sensitive adhesive layer 10 is arranged at a position overlapping the first convex portion 20b in the longitudinal direction of the napkin. When the sanitary napkin 1 is worn on the undergarment S, the wing-shaped flaps W have recessed portions 20a and 20c formed of outlines that bulge inward due to leg pressure from both sides in the width direction. Where wrinkles and twists are likely to occur along the direction, as described above, by arranging the main body adhesive layer 10 between the first concave portion 20a and the second concave portion 20c, the concave portion 20a , 20c are suppressed from affecting the adhesive strength of the main body adhesive layer 10, the fixability to the undergarment S is improved.

Next, the tip adhesive layer 11 preferably has a separation distance B of 0 to 10 mm from the tip of the wing-shaped flap W in the width direction of the sanitary napkin 1 . The tip adhesive layer 11 may be provided close to the tip of the wing-shaped flap W, or may be provided at a distance of 10 mm or less. As shown in FIG. 1, the tip adhesive layer 11 is preferably formed in a belt-like region extending straight along the longitudinal direction of the sanitary napkin 1. It may be formed along a line. That is, when the outline of the tip portion of the wing-shaped flap W is a curved line that bulges outward, it may be formed in a curved region along this curved line. By providing the tip adhesive layer 11 in the vicinity of the tip of the wing-shaped flap W in this way, it is possible to more reliably prevent the tip of the wing-shaped flap W from being turned up when the wing-shaped flap W is attached.

The tip adhesive layer 11 is arranged so that the left and right wing-shaped flaps W, W are completely accommodated in the overlapping portion 9 in the thickness direction of the sanitary napkin 1 when the sanitary napkin 1 is worn on underwear. However, it is not preferable to arrange it so as to extend outside the overlapping portion 9 or outside the overlapping portion 9 . When the tip adhesive layer 11 is arranged to extend to the outside of the overlapped portion 9, the area outside the overlapped portion 9 becomes underwear, so the tip adhesive layer 11 is positioned on the opposite side of the wing-shaped flap W. Since the adhesive strength of the tip adhesive layer 11 varies depending on the material of the adherend surface, it is not uniform throughout, and part of the tip adhesive layer 11 is The tip of the wing-shaped flap W may be easily peeled off when attached.

As shown in FIG. 1, when the front contour line 20 of the wing-shaped flap W is a wavy line, the tip pressure-sensitive adhesive layer 11 is formed between the outermost second convex portion 20d and the length of the napkin. It is preferable to arrange it in a position overlapping with the direction. By providing the convex portion 20d adjacent to the tip-side outline 22, as shown in FIG. The wing-shaped flaps W of the overlapped portion 9 and the adhesive layer 11 for bonding the W can also be provided in a wide area, so that the separation of the tip portions can be more reliably prevented.

As shown in FIGS. 1 to 3, the tip adhesive layer 11 is preferably provided on the left and right wing-shaped flaps W, W, respectively. At the time of attachment, the tip portions of the wing-shaped flaps W, W are joined to each other in the overlapping portion 9 of the left and right wing-shaped flaps W, W by the outer layer of the wing-shaped flaps W, W stacked in the overlapping portion 9. Although only the wing-shaped flap W on the side, the tip adhesive layer 11 provided on the wing-shaped flap W on the inner layer side (undergarment S side) adheres the overlapping portion 9 to the outer surface of the crotch portion of the undergarment S to some extent. Since the wing-shaped flaps W and W are separated from the underwear S, the tip portions of the wing-shaped flaps W and W are pulled to the tip adhesive layer 11 that joins the tip portions of the wing-shaped flaps W and W. It is possible to prevent easy peeling due to the action of force or shear force. The tip adhesive layer 11 is provided only on one of the left and right wing-shaped flaps W, and the wing-shaped flap W provided with the tip adhesive layer 11 is the outer layer. The overlapping portion 9 may not be fixed to the undergarment S by forming the overlapping portion 9 so as to be on the side. In this case, deformation of the undergarment S is less likely to be transmitted to the tips of the wing-shaped flaps W, and excessive force is less likely to act on the tip adhesive layer 11 that joins the tips of the wing-shaped flaps W. .

DESCRIPTION OF SYMBOLS 1... Sanitary napkin, 2... Back sheet, 3... Top sheet, 4... Absorber, 7... Side sheet, 8... Adhesive layer, 9... Overlapping part, 10... Body part adhesive layer, 11... Tip part adhesive agent layer, 12... area

Claims (5)

An absorbent article in which a pair of left and right wing-shaped flaps are folded back in the width direction when worn on underwear, and an overlapping portion is formed in which tip portions overlap each other on the outer surface of the crotch portion of the underwear,
The wing-shaped flap includes a main body adhesive layer that bonds to the outer surface of the underwear, and a tip adhesive layer that joins the tips of the wing-shaped flaps in the overlapping portion,
The absorbent article, wherein the adhesive strength of the tip adhesive layer is smaller than the adhesive strength of the body adhesive layer. The body portion adhesive layer is provided in a coating pattern in which an adhesive is applied to the entire surface of a predetermined area,
2. The absorbent article according to claim 1, wherein the tip adhesive layer is provided in a coating pattern in which the adhesive is intermittently applied to predetermined regions. 3. The absorbent article according to claim 1, wherein the adhesive strength of said tip adhesive layer is 20 to 60% of the adhesive strength of said main body adhesive layer. The absorbent article according to any one of claims 1 to 3, wherein the tip adhesive layer is provided at a position separated from the tip of the wing-shaped flap by 0 to 10 mm in the width direction of the absorbent article. 5. The absorbent article according to any one of claims 1 to 4, wherein said body portion pressure-sensitive adhesive layer is provided at a position separated from the base end portion of said wing-shaped flap in the width direction of the absorbent article by 5 to 20 mm.

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