WO2022118734A1

WO2022118734A1 - Absorbent article

Info

Publication number: WO2022118734A1
Application number: PCT/JP2021/043249
Authority: WO
Inventors: 歩美永橋
Original assignee: 大王製紙株式会社
Priority date: 2020-12-02
Filing date: 2021-11-25
Publication date: 2022-06-09
Also published as: JP2022088053A; TW202228619A

Abstract

Provided is an absorbent article which has a main body comprising: a liquid-permeable top sheet; a liquid-impermeable back sheet; and an absorbent body disposed between the top sheet and the back sheet, the absorbent article having a pair of wings each of which has a front-back direction corresponding to the front-back direction of the body of a wearer and a width direction perpendicular to the front-back direction, and extends outward from the main body to the width direction, wherein adhesive parts are formed on the back sheet sides of the wings, and the adhesive parts each have, in a state in which the wings are unfolded, a strong adhesive section on an inner side in the width direction and a weak adhesive section on the outer side in the width direction.

Description

Absorbent article

The present invention relates to an absorbent article.

Many absorbent articles such as menstrual napkins, incontinence pads, and vaginal discharge sheets are provided with an adhesive (adhesive for the main body) on the non-skin side to prevent misalignment with respect to underwear. The composition of the adhesive for the main body has been devised in various ways. For example, as described in Patent Document 1, there is also one in which two or more kinds of adhesives are used in consideration of peeling sound and the like.

The absorbent article described in Patent Document 1 is provided with a pair of wings (a pair of flap-shaped portions extending outward in the width direction from the side portions of the absorbent article body), and the pair of wings Adhesive portions (adhesive portions for wings) are also provided on the non-skin side surfaces.

Japanese Unexamined Patent Publication No. 2006-296974

As described in Patent Document 1, various ideas are known regarding the composition of the adhesive for the main body. However, there is still much room for consideration regarding the composition of the wing adhesive.

The wing needs to be securely fixed to the underwear while wearing the absorbent article. For more reliable fixing, it is sufficient to increase the adhesive strength of the adhesive, but if this is done, the wing may not easily come off from the underwear when the absorbent article is removed, depending on the material of the underwear or the like. In that case, it is necessary to hold each wing by hand and peel it off, and then peel off the main body from the underwear, which may complicate the operation of removing the absorbent article.

In view of the above, one aspect of the present invention is to provide an absorbent article having a wing that can be more securely fixed to the underwear during wearing and can be easily removed from the underwear at the time of removal.

One aspect of the present invention is an absorbent article having a body comprising a liquid permeable top sheet, a non-liquid permeable back sheet, and an absorber disposed between the top sheet and the back sheet. The wing has a front-back direction corresponding to the front-back direction of the wearer's body and a width direction orthogonal to the front-back direction, and includes a pair of wings extending outward from the main body in the width direction. An adhesive portion is formed on the backsheet side of the above, and the adhesive portion has a strong adhesive portion on the inner side in the width direction and a weak adhesive portion on the outer side in the width direction in a state where the wing is deployed.

According to one aspect of the present invention, it is possible to provide an absorbent article having a wing that can be more securely fixed to the underwear during wearing and can be easily removed from the underwear at the time of removal.

It is a top view seen from the surface of the skin side of the absorbent article by one embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line II of FIG. It is a figure which shows the state which attached the absorbent article of FIG. 1 (the illustration of underwear is omitted). It is an enlarged view of the non-skin side surface of a wing. A modified example of the adhesive portion provided on the wing is shown. Another modification of the adhesive portion provided on the wing is shown. Yet another modification of the adhesive portion provided in the wing is shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, unless otherwise specified, the same or corresponding configurations may be designated by the same reference numerals and description thereof may be omitted. In addition, the drawings are schematic to help the understanding of the invention.

(Basic structure of absorbent articles)
First, the basic structure of the absorbent article according to the embodiment of the present invention will be described with reference to an example of a menstrual napkin. FIG. 1 shows a plan view of the absorbent article 1. Further, FIG. 2 shows a cross-sectional view taken along the line II of FIG.

As shown in FIGS. 1 and 2, the absorbent article 1 is a liquid-permeable back sheet 2, a liquid-permeable top sheet 3, and an absorption device arranged between the back sheet 2 and the top sheet 3. It has a flat body (absorbent article body) 8 with a body 4. When the absorbent article 1 is attached, the top sheet 3 side is the side facing the skin (skin side or the front side), and the back sheet 2 side is the side facing the underwear (underwear side or the back side). The plan view of FIG. 1 is a view seen from the skin side of the absorbent article 1.

Further, in the present specification, as shown in FIG. 1, the direction corresponding to the anteroposterior direction of the wearer's body when the absorbent article 1 is attached is defined as the anteroposterior direction D1 of the absorbent article 1, and the anteroposterior direction D1. The direction orthogonal to is defined as the width direction D2 of the absorbent article 1. The main body 8 has an elongated shape that is long in the front-rear direction D1 in a plan view, has a predetermined length in the front-rear direction D1, and has a predetermined width in the width direction D2 orthogonal to the front-rear direction D1. ..

In the form shown in FIG. 1, the main body 8 has a plan view shape that is substantially line-symmetrical with respect to the center line (front-back direction center line) CL extending in the front-rear direction D1, but the shape of the main body 8 is axisymmetric. It doesn't have to be. Further, the shape of the entire absorbent article 1 may or may not be line-symmetrical with respect to the center line CL in the anteroposterior direction. Further, configurations other than the shapes of the absorbent article 1 and the main body 8 (including the thickness and density of the absorbent body 4, the size and position of the squeezing groove, the shape and size of the wing, etc.) are symmetrical to the center line CL in the anteroposterior direction. It may or may not be symmetrical as an axis.

The absorbent article 1 has an intermediate region M mainly opposed to the crotch of the wearer at the time of wearing, a front region F adjacent to the front of the intermediate region M, and a rear region R adjacent to the rear of the intermediate region M. The intermediate region M includes the body fluid discharge port facing region Q. The body fluid discharge port facing region Q is a region facing the body fluid discharge port such as the wearer's vaginal opening and urethral opening and the peripheral area thereof at the time of wearing. The center of the body fluid discharge port facing region Q is located on the center line in the long direction, and may be a region having a length (length of D1 in the front-rear direction) of 10 to 50 mm and a width (length of D2 in the width direction) of 5 to 40 mm. can. In FIG. 1, the body fluid discharge port facing region Q is drawn in an elliptical shape as a region facing the vaginal opening. However, the above-mentioned size and shape of the body fluid discharge port facing region Q are merely examples for explaining the absorbent article 1 according to this embodiment.

The back sheet 2 may be a non-liquid permeable sheet having at least water impermeability, and may be, for example, a sheet made of an olefin resin such as polyethylene or polypropylene. Further, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, or a laminated sheet of a nonwoven fabric in which a waterproof film is interposed to ensure substantially impermeable liquid permeability can be used. Further, from the viewpoint of preventing stuffiness, it is more desirable to use a material having moisture permeability. Such a water-impervious / moisture-permeable sheet material is obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. A porous sheet or the like can be used. The back sheet 2 may be a sheet having the same outer shape as the outer shape of the absorbent article 1.

The top sheet 3 can be a liquid-permeable sheet that rapidly permeates body fluids such as menstrual blood, vaginal discharge, and urine. As the top sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. As the material fibers constituting the non-woven fabric, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, blended fibers thereof, and natural fibers such as cotton are used alone or. Two or more types can be used in combination. Examples of the non-woven fabric processing method include a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and a needle punching method. Among these processing methods, the spunlace method is preferable in that it can produce a flexible non-woven fabric and the spunbond method is preferable in that it can produce a non-woven fabric having a high drape property, and the thermal bond method is preferable in that it can produce a bulky and soft non-woven fabric. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used.

The absorber 4 is not limited as long as it is a material capable of absorbing and retaining body fluid, but preferably contains cotton-like pulp and a water-absorbent polymer. As the water-absorbent polymer, a superabsorbent polymer granular powder (superabsorbent polymer (SAP)), a superabsorbent polymer fiber (SAF)), and a combination thereof 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. As a raw material for chemical pulp, hardwood, softwood and the like are used, but softwood is preferably used because of its long fiber length and the like.

Further, synthetic fibers may be mixed with the absorber 4. As the synthetic fiber, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used, and two of these may be mixed and used. You can also. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used. In addition, it is also possible to use a hydrophobic fiber whose surface is treated with a hydrophilic agent to give an affinity to a body fluid. The absorber 4 is preferably manufactured by a stacking fiber or an airlaid method.

The absorber 4 may have a shape and a size that does not protrude from the back sheet 2 and the top sheet 3 in the front-rear direction D1. Then, at both end edges in the front-rear direction D1, the edge portion of the back sheet 2 and the edge portion of the top sheet 3 may be joined by an adhesive, a heat seal, or the like. Further, the absorber 4 may have at least a shape and a size that does not protrude from the back sheet 2 in the width direction D2.

The absorbent article 1 has a pair of sides over the front-rear direction D1 on both sides of the main body 8, that is, on the top sheet 3 side (the side facing the wearer's skin at the time of wearing or the skin side) at both ends in the width direction D2.

Sheets

7 and 7 are arranged. The

side sheets

7 and 7 may be joined to the side portions of the skin side surface of the top sheet 3, respectively. The side seats 7 and 7 extend outward in the width direction D2 in the intermediate region M, and are joined to the back sheet 2 extending in the width direction D2 in the intermediate region M (FIG. 2). Is forming.

Wings

10 and 10 may be formed on both sides of a region including a body fluid discharge port facing region Q or an intermediate region M, respectively. The front region F may be a region from the front end of the wing 10 to the front edge of the absorbent article 1, and the rear region R may be a region from the rear end of the wing 10 to the rear edge of the absorbent article 1. May be. In this embodiment, the width of the absorbent article 1 is extremely small at the front end and the rear end of the wing 10.

Further, the absorbent article main body 8 may be formed with a squeezing groove or embossing recessed from the top sheet 3 side to the back sheet 2 side. The squeezing groove has a function of promoting deformation of the absorbent article main body 8 at the time of wearing and controlling the movement of body fluid.

(Adhesive part for wings)
As shown in FIGS. 1 and 2,

adhesive portions

20 and 20 are formed on the non-skin side (back sheet 2 side) of the pair of

wings

10 and 10, respectively. Then, in the present embodiment, each adhesive portion 20 is wider than the strong adhesive portion 21 formed inside the width direction D2 and the strong adhesive portion 21 when viewed in a state where the

wings

10 and 10 are expanded (FIG. 1). The weak adhesive portion 22 formed on the outer side of the direction D2 is included. The adhesive portion 20 (including the strong adhesive portion 21 and the weak adhesive portion 22) formed in one wing 10 has a planar viewing area of about 75 to 1000 mm ² .

FIG. 3 shows a view of the state in which the absorbent article 1 shown in FIGS. 1 and 2 is attached to the underwear, as viewed from the back sheet 2 side of the main body 8. However, in FIG. 3, the illustration of underwear is omitted. As shown in FIG. 3, when the absorbent article 1 is attached, the

wings

10 and 10 are folded back to the non-skin side surface of the underwear, respectively. At that time, the

adhesive portions

20 and 20 formed on the back sheet 2 side of the

wings

10 and 10 come into contact with the non-skin side surface of the underwear, respectively, so that the

wings

10 and 10 come into contact with the

adhesive portions

20 and 20, respectively. Can be fixed to underwear. As shown in FIG. 3, when the absorbent article 1 is attached, that is, when the

wings

10 and 10 are folded back, the strong adhesive portion 21 is outside the width direction D2, and the weak adhesive portion 22 is from the strong adhesive portion 21. Is also located inside the width direction D2. In other words, the strong adhesive portion 21 is located near the root or the base end (the end connected to the main body 8 in the width direction D2) of the wing 10, and the weak adhesive portion 22 is the free end of the wing (the free end of the wing). It is located near the end (the end away from the main body 8 in the width direction D2).

In the present specification, the terms "strong adhesive portion" or "strong adhesive" and "weak adhesive portion" or "weak adhesive" are terms indicating the relative strength of the adhesive strength, and the adhesive strength. Does not mean a predetermined value of.

In this embodiment, the adhesive portion 20 has a strong adhesive portion 21 and a weak adhesive portion 22 arranged side by side in the width direction D2. Since the adhesive portion 20 extends in the width direction D2 with a certain width, the wing 10 can be fixed to the underwear so as not to move in the width direction D2, and the main body 8 can also be stably fixed in the width direction D2. Further, since the strong adhesive portion 21 is located near the root of the wing 10, the root of the wing 10, underwear, and the edge of the main body 8 in the width direction D2 can be securely fixed in the thickness direction, and the width direction D2 of the main body 8 can be reliably fixed. It is possible to prevent curling and twisting of the edges.

Further, according to this embodiment, it is possible to securely fix it to the underwear, and it is also easy to remove the absorbent article 1 from the underwear. Normally, when removing the absorbent article 1 from the underwear, the user pulls the absorbent article 1 by holding the front or rear end of the main body 8 to remove the main body 8 from the underwear. Then, due to the tensile force at that time, the

wings

10 and 10 are often peeled off from the underwear without touching the

wings

10 and 10. However, in the conventional configuration, depending on the material of the underwear, the type of the adhesive, and the like, the

wings

10 and 10 may remain adhered to the underwear and cannot be peeled off by a normal pulling force. In that case, it may be necessary to directly hold the

wings

10 and 10 and peel them off from the back side of the underwear, or the

wings

10 and 10 may be damaged by forcibly pulling them. On the other hand, in the present embodiment, the weak adhesive portion 22 is formed at a position (a position near the free end of the wings 10 and 10) of the

adhesive portions

20 and 20 away from the edge portion in the width direction D2 of the main body 8. This makes it easy to remove the

wings

10 and 10.

More specifically, for example, when the main body 8 is pulled by holding the front end of the absorbent article 1, the pulling force is transmitted to the

wings

10 and 10, and the

wings

10 and 10 are the arrows A in FIG. As shown by A, it is pulled diagonally. The tensile force at this time is easily transmitted to a position near the edge of the width direction D2 of the main body 8, but is located away from the edge of the width direction D2 of the main body 8 (center in the front-rear direction with the wing 10 folded back). It is difficult to transmit to the position near the line CL). Therefore, by setting the adhesive portion at a position away from the edge portion in the width direction D2 of the main body 8 as the weak adhesive portion 22, the adhesive can be easily released even if the transmitted tensile force is weak, and the wing 10 can be easily peeled off from the underwear. Can be done. Therefore, when removing the absorbent article 1, there is no need to directly hold and open the

wings

10 and 10, and the removal operation is not complicated.

As described above, according to this embodiment, it is possible to achieve both the secure fixing of the absorbent article during mounting and the ease of removal at the time of removal.

Both the strong adhesive portion 21 and the weak adhesive portion 22 are formed by a layer of an adhesive. It is formed by applying a pressure-sensitive adhesive which is a fluid, or by applying a layer of a pressure-sensitive adhesive (adhesive tape or the like) formed in advance. As the adhesive used for the strong adhesive portion 21 and the weak adhesive portion 22, known adhesives conventionally used as adhesive portions for the main body or wings, for example, hot melt type adhesives can be used. Examples of the main component thereof include styrene-based polymers, tackifiers, and plasticizers, and combinations thereof.

Examples of the styrene-based polymer include styrene-ethylene-butylene-styrene block copolymer, styrene-butylene-styrene block copolymer, styrene-isobutylene-styrene copolymer, styrene-butadiene-styrene block copolymer and the like. , One or more of these can be used.

Further, as the tackifier and the plasticizer, solid ones at room temperature can be used. Examples of the tackifier include C5 type petroleum resin, C9 type petroleum resin, dicyclopentadiene type petroleum resin, rosin type petroleum resin, polyterpene resin, terpene phenol resin and the like. Examples of the plasticizer include monomer plasticizers such as triflesyl phosphate, dibutyl phthalate, and dioctyl phthalate, as well as polymer plasticizers such as vinyl polymers and polyesters.

A pressure-sensitive adhesive having a relatively large adhesive strength or peeling strength is used for the strong adhesive portion 21, and a pressure-sensitive adhesive having a relatively small adhesive strength or peeling strength is used for the weak adhesive portion 22. The pressure-sensitive adhesive used for the strong adhesive portion 21 and the pressure-sensitive adhesive used for the weak adhesive portion 22 may be of the same type or different types as long as they have different adhesive strengths.

Further, the basis weight (coating amount per unit area) may be different between the pressure-sensitive adhesive applied to the strong adhesive portion 21 and the pressure-sensitive adhesive applied to the weak adhesive portion 22. That is, the basis weight of the adhesive in the strong adhesive portion 21 (G ₁ ) may be larger than the basis weight of the adhesive portion in the weak adhesive portion 22 (G ₂ ). The basis weight (G ₁ ) of the adhesive in the strong adhesive portion 21 may be preferably 23 to 26 g / m ² , and the basis weight (G ₂ ) of the adhesive portion in the weak adhesive portion 22 is preferably 20 to 22 g / m 2. It may be m ² . Further, the basis weight (G ₁ ) (that is, G ₁ / G ₂ ) of the adhesive in the strong adhesive portion 21 with respect to the basis weight (G ₂ ) of the adhesive portion in the weak adhesive portion 22 is preferably 0.96 to 1.30. It may be preferably 1.09 to 1.18.

FIG. 4 shows an enlarged view of one wing 10 as seen from the back seat 2 side. As is clear from FIG. 4, both the strong adhesive portion 21 and the weak adhesive portion 22 extend along the front-rear direction D1 and have a band shape having a substantially constant width (length in the width direction D2). It is formed as a part. Such a strip-shaped strong adhesive portion 21 and weak adhesive portion 22 are provided with an adhesive from a coating unit whose position is fixed to the wing release paper conveyed by a belt conveyor or the like on a production line for individually packaged absorbent articles. Can be formed by ejecting and transferring the adhesive applied in a band shape to the wing release paper to the back sheet of the wing in the direction in which the longitudinal direction of the band-shaped adhesive corresponds to the front-back direction D1 of the absorbent article. For example, two coating units arranged side by side in the width direction D2 are used, and different types of adhesives having different adhesive strengths are discharged from each nozzle of the coating units, or even if the same adhesive has a different basis weight. Each of the adhesives can be discharged with.

As shown in FIG. 4, the strong adhesive portion 21 and the weak adhesive portion 22 are in contact with each other, and both are formed continuously or substantially continuously. Therefore, the entire adhesive portion 20 is less likely to bend. Therefore, for example, it is possible to avoid the inconvenience that the strong adhesive portion 21 and the weak adhesive portion 22 are bent and stick to each other when the absorbent article 1 is attached. In addition, "substantially continuous" means that there may be a gap of 1 mm or less locally between the strong adhesive portion 21 and the weak adhesive portion 22.

Further, it is preferable that the adhesive portion 20 is not so far from the main body 8. For example, the distance d (FIG. 4) between the base end (boundary between the main body 8 and the wing 10) of the wing 10 in the width direction D2 and the adhesive portion 20 is preferably 3 mm or more and 5 mm or less. When the interval d is 3 mm or more, it is possible to prevent the adhesive portions 20 from sticking to each other on the back sheet 2 side of the wing 10 when the wing 10 is folded back. On the other hand, when the interval d is 5 mm or less, the wing 10 can be fixed to the underwear near the root thereof, so that the wing 10 can be prevented from twisting or floating from the underwear. Further, since the edge portion of the main body 8 in the width direction D2, which is easily deformed during mounting, can be more reliably fixed to the underwear, the effect of preventing the edge portion of the main body 8 in the width direction D2 from being rolled up or twisted is enhanced.

Although not shown in the present embodiment, the adhesive may be arranged on the back sheet 2 side of the main body 8 by a known method. The adhesive for the main body may be of the same type as the adhesive for wings (adhesive of a strong adhesive portion or an adhesive of a weak adhesive portion), or may be of a different type.

Further, in order to further improve the ease of peeling off the wing 10 when the absorbent article 1 is removed, in this embodiment, the outer contour of the side portion of the front region F is substantially parallel to the longitudinal direction D1. preferable. Further, it is preferable that the contour shape of the front region F does not have a constriction near the front end of the wing 10. With little or no constriction, when the absorbent article 1 is removed and pulled by holding the front end of the main body 8, stress can be excessively concentrated on the front end of the wing 10 and the wing 10 can break at the root. The sex can be reduced. The angle α between the straight line X connecting the widest position in the front region F and the boundary position between the front region F and the intermediate region M (the front end of the wing 10) and the front-rear direction D1 or the front-back direction center line CL ( FIG. 1) is preferably 10 ° or less or 0 °.

(Deformation example of adhesive part)
FIG. 5 shows a modified example of the adhesive portion 20. In the example shown in FIG. 5A, the strip-shaped strong adhesive portion 21 and the weak adhesive portion 22 are formed as in the example of FIG. 4, but the front end 21a of the strong adhesive portion 21 is the weak adhesive portion 22. It is located in front of the front end 22a. With this configuration, the wing 10 can be more easily removed from the underwear when the absorbent article 1 is removed.

As described above, when removing the absorbent article 1, most users hold the front end of the absorbent article 1 body 8 and pull the body 8 from front to back to underwear the body 8. I will peel it off from. Therefore, the wing 10 is also peeled off from the front, and the peeling of the adhesive portion 20 also starts from the front end thereof. Since the wing 10 receives a particularly large resistance at the start of peeling, a force is required to peel it off, so it is preferable that the wing 10 can be peeled off smoothly at the front end of the adhesive portion 20. In the example of FIG. 5A, at the front end of the adhesive portion 20, the weak adhesive portion 22 located outside the width direction D2 does not exist, and only the strong adhesive portion 21 located inside the width direction D2 exists. ing. As described above, since there is no outer portion in the width direction D2 in which the force is difficult to be transmitted and peeled off in the entire adhesive portion 20, the force required at the start of peeling of the adhesive portion 20 is reduced, and the adhesive portion 20 can be peeled off smoothly. You can start. Therefore, the absorbent article 1 can be removed from the underwear more easily.

The length L ₁ of the strong adhesive portion 21 in the front-rear direction D1 may be about 15 to 50 mm, and the length L ₂ of the weak adhesive portion 22 in the front-rear direction may be about 12 to 47 mm. Further, the ratio (L ₁ / L _W ) of the length L ₁ of the front-rear direction D1 of the strong adhesive portion 21 to the length L _W of the front-rear direction D1 at the base end of the wing 10 (the boundary line between the main body 8 and the wing 10). X100) is preferably 35 to 80%. Further, the ratio (L ₂ / L _W × 100) of the length L2 of the weak adhesive portion 22 in the front-rear direction D1 to the length L _W of the front-rear direction D1 at the base end of the wing 10 is 30 to 75%. preferable.

Further, as shown in FIG. 5B, the strong adhesive portion 21 and the weak adhesive portion 22 may have different lengths in the width direction D2 from each other. The length (width) W ₁ of the strong adhesive portion 21 in the width direction D2 may be about 3 to 10 mm, and the length (width) W ₂ of the weak adhesive portion 22 in the width direction D2 is about 2 to 10 mm. It may be there. Further, the length (W ₁ + W ₂ ) of the adhesive portion 20 in the width direction D2 may be about 5 to 20 mm.

Further, the ratio of the length (width) W ₁ of the strong adhesive portion 21 in the width direction D2 to the total length (W ₁ + W ₂ ) of the adhesive portion _{20 in the width direction (W 1 + W 2} ₎ _. X100) is preferably 15 to 60%. When the width W ₁ of the strong adhesive portion 21 is within the above range, it is possible to exert a reliable fixing function to the underwear of the strong adhesive portion 21 being worn, and at the time of removal, the force is easily transmitted to the entire strong adhesive portion 21 and the wing Easy to remove.

It should be noted that preferably, the ratio of the length (width) W ₁ of the strong adhesive portion 21 in the width direction D2 to the length W _W of the width direction D2 of the wing 10 (the length from the base end to the free end of the wing 10). (W ₁ / W _W × 100) may be 5 to 45%. Further, the ratio (W ₂ / _WW × 100) of the length (width) _W ₂ of the weak adhesive portion 22 in the width direction D2 to the length WW of the width direction D2 of the wing 10 is 55 to 95%. good.

FIG. 6 shows another modified example of the adhesive portion 20. In the example shown in FIG. 6A, the adhesive portion 20 also includes the strong adhesive portion 21 and the weak adhesive portion 22, but in the example of FIG. 6A, the weak adhesive portion 22 is the first weak adhesive portion. It has a 221 and a second weak adhesive portion 222. The first weak adhesive portion 221 and the second weak adhesive portion 222 both have a smaller adhesive strength than the strong adhesive portion 21, but the first weak adhesive portion 221 has a larger adhesive strength than the second weak adhesive portion 222. ing. Therefore, for example, the basis weight of the adhesive in the first weak adhesive portion 221 may be larger than the basis weight of the adhesive in the second weak adhesive portion 222. As a result, the strong adhesive portion 21, the first weak adhesive portion 221 and the second weak adhesive portion 222 are arranged side by side from the inside to the outside in the width direction D2 when the

wings

10 and 10 are deployed. , The adhesive strength gradually decreases from the inside to the outside.

As described above, in the form in which the adhesive portion 20 has three or more portions whose adhesive force changes stepwise when viewed in the width direction D2, toward the free end of the wing 10 (the edge of the main body 8 in the width direction D2). The adhesive strength can be changed gently (in the direction away from the part). Therefore, for example, in a form in which the adhesive strength differs depending on the basis weight, the thickness differs between the strong adhesive portion 21 and the weak adhesive portion 22 depending on the adhesive used, and the adhesive portion 20 can be sufficiently attached to the underwear. However, according to this example, such a situation can be avoided.

When the weak adhesive portion 22 is formed of a plurality of portions having different adhesive strengths as in this example, as shown in FIG. 6A, the first weak adhesive portion 221 from the front end 21a of the strong adhesive portion 21 It is preferable that the front end 221a of the first weak adhesive portion 221 is located rearward, and the front end 222a of the second weak adhesive portion 222 is located rearward from the front end 221a of the first weak adhesive portion 221. As described above, the front end of the adhesive portion 20 is located rearward from the inside to the outside in the width direction D2 of the wing 10, so that the above-mentioned effect when the wing 10 is removed, that is, the adhesive portion It is possible to improve the effect that the operation at the start of peeling of 20 becomes smooth.

Further, as shown in FIG. 6B, when the adhesive portion 20 is composed of the strong adhesive portion 21, the first weak adhesive portion 221 and the second weak adhesive portion 222, the position of the rear end of each portion. May be different. More specifically, the rear end 221b of the first weak adhesive portion 221 is located in front of the rear end 21b of the strong adhesive portion 21, and the rear end 221b of the first weak adhesive portion 221 is behind the second weak adhesive portion 222. The end 222b may be located forward. As shown in FIG. 6B, the positions of the rear ends of the respective parts are different, so that even when the absorbent article 1 is removed by holding the rear end of the main body 8 and peeling off, the

wings

10 and 10 have different positions. Can be easily removed.

As described above, the closer the front end of each portion of the adhesive portion 20 is to the outside of the width direction D2, the farther away from the front end of the front-rear direction D1 of the wing 10, and the rear end of each portion of the adhesive portion 20 is the width direction D2. If the wing 10 is configured to move away from the rear end of the wing 10 in the front-rear direction toward the outside of the wing 10, the

wing

10 and 10 can be easily removed regardless of whether the absorbent article 1 is removed from the front or the rear when the absorbent article 1 is removed. be able to. Further, in the case where the configuration of the main body 8 and the outer shape of the entire absorbent article 1 are symmetrical in the front-rear direction, the

wings

10 and 10 can be easily used from the front regardless of which end of the front-rear direction D1 is in front. Can be removed.

In the example of FIG. 6, the weak adhesive portion 22 is formed of two portions having different adhesive strengths arranged in the width direction D2, but the weak adhesive portion 22 is formed from the inside to the outside in the width direction D2. It may be formed of three or more portions whose adhesive strength gradually decreases.

FIG. 7 shows yet another modification of the adhesive portion 20. In the example described with reference to FIGS. 1 to 6, the strong adhesive portion 21 and the weak adhesive portion 22 are band-shaped and substantially rectangular. On the other hand, in the example shown in FIG. 7, the strong adhesive portion 21 and the weak adhesive portion 22 are both band-shaped but not rectangular. In the example shown in FIG. 7 (a), the plan view shape of the entire adhesive portion 20 is a trapezoid, and in the example shown in FIG. 7 (b), the plan view shape of the entire adhesive portion 20 is a triangle. In each example, the front end 21a of the strong adhesive portion 21 is located in front of the front end 22a of the weak adhesive portion 22, and the rear end 21b of the strong adhesive portion 21 is located behind the rear end 22b of the weak adhesive portion 22. Therefore, when the absorbent article 1 is removed from the underwear, the main body 8 can be easily peeled off even if the main body 8 is peeled off from the front or the rear.

As shown in FIG. 7, the adhesive portion whose front end and / or rear end is not parallel to the width direction D2 covers the wing 10 with the layer of the strong adhesive portion 21 and the layer of the weak adhesive portion 22 formed in a predetermined shape. It can be formed by wearing it.

Hereinafter, specific embodiments of the present invention will be described.

(Appendix 1)
An aspect according to Appendix 1 is an absorbent article having a main body including a liquid permeable top sheet, a non-liquid permeable back sheet, and an absorber arranged between the top sheet and the back sheet. The wing has a front-back direction corresponding to the front-back direction of the wearer's body and a width direction orthogonal to the front-back direction, and includes a pair of wings extending outward from the main body in the width direction. An adhesive portion is formed on the backsheet side of the above, and the adhesive portion has a strong adhesive portion on the inner side in the width direction and a weak adhesive portion on the outer side in the width direction in a state where the wing is deployed.

According to the aspect according to the above appendix 1, since the adhesive portion (strong adhesive portion and weak adhesive portion) of the wing extends in the width direction, the deviation in the width direction of the wing is prevented particularly at the time of mounting. The wing can be more reliably and properly fixed to the underwear. In addition, by making the adhesive part a strong adhesive part near the base of the wing, the underwear can be securely sandwiched between the widthwise edge of the main body and the wing, and the widthwise edge of the main body can be curled or twisted. Can be prevented.

On the other hand, when removing the absorbent article, many users remove the main body from their underwear by holding the front or rear end of the main body and pulling it. Then, since the tensile force is transmitted to the adhesive portion of the wing, the user can remove the wing from the underwear without touching the wing. However, if the adhesive portion extends in the width direction, it may be difficult to remove the wing due to the pulling force of the main body depending on the material of the underwear or the like. Of the adhesive part, the part close to the widthwise edge of the main body is relatively easy to peel off because the above-mentioned tensile force is easily transmitted, but the farther away from the widthwise edge of the main body, the less the pulling force is transmitted to the adhesive part. It will take a lot of force to remove the wing. On the other hand, in the aspect according to the above appendix 1, the portion of the adhesive portion separated from the widthwise edge portion of the main body (far from the root of the wing) is a weak adhesive portion having a weak adhesive force (peeling strength). Since the adhesive portion is easily peeled off at a position away from the widthwise edge portion of the main body, the wing can be peeled off without requiring a large force. Therefore, it is possible to reliably fix the absorbent article during mounting, and to obtain an absorbent article in which the wing can be easily removed from the underwear at the time of removal.

(Appendix 2)
In the aspect according to Appendix 2, the basis weight of the adhesive in the strong adhesive portion is larger than the basis weight of the adhesive in the weak adhesive portion.

According to the aspect of Appendix 2, the strong adhesive portion and the weak adhesive portion can be formed by changing the basis weight of the adhesive (the amount of the adhesive per unit area) between the inside and the outside in the width direction. , It is easy to adjust the adhesive strength between the strong adhesive portion and the weak adhesive portion.

(Appendix 3)
In the embodiment according to Appendix 3, the front end of the weak adhesive portion is located behind the front end of the strong adhesive portion.

When removing the absorbent article from the underwear, in many cases, the user pulls the main body by holding the front end of the absorbent article, so that the wing is peeled off from the front and the adhesive part is also peeled off from the front end. Then, at the position where the adhesive portion starts to be peeled off, that is, at the front end of the adhesive portion, the wing is susceptible to a large resistance, so that a particularly large force is required. According to the aspect according to the above-mentioned appendix 3, only the strong adhesive portion located inside in the width direction is present at the front end of the adhesive portion. That is, since there is no adhesive portion at the front end located at a position farther from the widthwise edge portion of the main body where the force is difficult to be transmitted, it is possible to start peeling only from the front end of the adhesive portion inside the width direction where the force is easily transmitted. Therefore, the force required for the peeling start operation of the adhesive portion is reduced, and the absorbent article can be removed with a smaller force.

(Appendix 4)
In the aspect according to Appendix 4, the length of the strong adhesive portion in the width direction is 15 to 60% of the total length of the adhesive portion in the width direction.

According to the aspect of Appendix 4, by setting the length of the strong adhesive portion in the width direction within a predetermined range, the wing can be securely fixed by underwear while the absorbent article is attached, and the absorbent article can be removed. Sometimes, the above-mentioned effect of being able to remove the wing from the underwear more easily can be improved.

(Appendix 5)
In the embodiment according to Appendix 5, the strong adhesive portion and the weak adhesive portion are in contact with each other.

According to the aspect according to the above-mentioned appendix 5, there is no gap between the strong adhesive portion and the weak adhesive portion, and both are continuous or substantially continuous, so that when the absorbent article is attached, the absorbent article is attached. It is possible to prevent the wing from bending between the strong adhesive portion and the weak adhesive portion and causing the strong adhesive portion and the weak adhesive portion to stick to each other.

(Appendix 6)
In the embodiment according to Appendix 6, the distance between the base end of the wing in the width direction and the inner end of the adhesive portion in the width direction is 3 mm or more and 5 mm or less.

According to the aspect of Appendix 6, since the adhesive portion is arranged at a predetermined position from the base end in the width direction of the wing, the force of pulling the main body when removing the absorbent article is easily transmitted to the adhesive portion, and the wing. Can be peeled off more easily, and when the wing is folded back, it is possible to prevent the adhesive portions from sticking to each other on the back sheet side of the wing.

This application claims the priority of Basic Application No. 2020-200288 filed with the Japan Patent Office on December 2, 2020, and the entire contents thereof are incorporated herein by reference.

1 Absorbent article 2 Back sheet 3 Top sheet 4 Absorber 7 Side sheet 8 Absorbent article body 10 Wing 20 Adhesive part 21 Strong adhesive part 22 Weak adhesive part 221 First weak adhesive part 222 Second weak adhesive part CL Front-back direction center Line D1 Front-back direction D2 Width direction F Front area M Intermediate area R Rear area Q Body fluid discharge port facing area

Claims

An absorbent article having a body comprising a liquid permeable top sheet, a non-liquid permeable back sheet, and an absorber disposed between the top sheet and the back sheet.
It has a front-back direction corresponding to the front-back direction of the wearer's body and a width direction orthogonal to the front-back direction.
A pair of wings extending outward in the width direction from the main body are provided.
An adhesive portion is formed on the backsheet side of the wing, and the adhesive portion is formed.
An absorbent article in which the adhesive portion has a strong adhesive portion on the inner side in the width direction and a weak adhesive portion on the outer side in the width direction in a state where the wing is expanded.
The absorbent article according to claim 1, wherein the basis weight of the adhesive in the strong adhesive portion is larger than the basis weight of the adhesive in the weak adhesive portion.
The absorbent article according to claim 1 or 2, wherein the front end of the weak adhesive portion is located behind the front end of the strong adhesive portion.
The absorbent article according to any one of claims 1 to 3, wherein the length of the strong adhesive portion in the width direction is 15 to 60% of the total length of the adhesive portion in the width direction.
The absorbent article according to any one of claims 1 to 4, wherein the strong adhesive portion and the weak adhesive portion are in contact with each other.
The absorbent article according to any one of claims 1 to 5, wherein the distance between the base end in the width direction of the wing and the inner end in the width direction of the adhesive portion is 3 mm or more and 5 mm or less.