TWI826666B - absorbent articles - Google Patents

Abstract

The friction between the sanitary napkin and the wearer's skin is less likely to occur when wearing it.

The present invention provides a surface sheet 3 on the skin side and a back surface on the non-skin side. The sanitary napkin 1 is provided with an anti-displacement adhesive layer 11 for external fixation on the non-skin side of the body portion with the absorbent body 4 interposed between the sheets 2 . The shear deformation layer 10 is provided between the absorbent body 4 and the displacement-preventing adhesive layer 11. By the shear deformation of the shear deformation layer 10, a member disposed on the skin side of the shear deformation layer 10 is formed. The members arranged on the non-skin side of the shear deformation layer 10 can be relatively displaced in the surface direction. The shear deformation layer is made of foamed resin. The shear deformation layer 10 is provided on the non-skin side of the back sheet 2 or between the absorber 4 and the back sheet 2 .

Description

absorbent articles

The present invention relates to absorbent articles such as sanitary napkins, panty liners, disposable diapers, and incontinence pads. Specifically, it relates to an absorbent article that is provided with a shear deformation layer so that the absorbent articles are in contact with the wearer's skin during wear. Absorbent items that are less likely to cause friction.

Historically, it has been pointed out that when wearing an absorbent article, the wearer's movements such as foot movements, which change the posture, cause friction between the skin contact surface of the absorbent article and the wearer's skin, causing the wearer to Feeling itchy or painful, worsening of discomfort.

The cause of friction between absorbent articles and the wearer's skin can be listed as when wearing absorbent articles, because absorbent articles are fixed to the outside of underwear and diapers through anti-displacement members provided on the non-skin sides. The outer part of the garment, etc. is distorted or wrinkled in response to the wearer's movements, causing the outer part to be displaced relative to the wearer's skin, which may cause the absorbent article to be displaced along with the outer part.

As a technology for improving the adhesion to the skin to prevent leakage during use, the following Patent Document 1 discloses an absorbent article provided with a compression recovery sheet. The compression recovery sheet is thin in the packaging body of the absorbent article. The thickness recovers when taken out of the packaging body and used, and the absorbent article exhibits the required thickness during use. In addition, the following Patent Document 2 discloses an absorbent Absorbent articles, which are further laminated with a soft polyurethane foam with a high coefficient of friction on the outside of the back material as an anti-slip material to prevent the user from shifting between the absorbent article and underwear even if the user moves slightly during wearing. situation.

[Previous technical literature]

【Patent Document】

[Patent Document 1] Japanese Patent No. 3611745

[Patent document 2] Japanese Patent Application Publication No. 11-347066

It is also thought that, as mentioned above, the friction between the absorbent article and the wearer's skin is mainly caused by the relative displacement of the outer part and the wearer's skin. Therefore, as long as the absorbent article is fixed to the outer side, a certain amount of friction will inevitably occur. Therefore, measures such as improving the skin feel of the surface sheet have been adopted until now. In addition, as described in the above-mentioned Patent Document 1, the adhesion to the skin is improved by expressing thickness on the skin side, and as described in the above-mentioned Patent Document 2, the absorbent article is made less likely to be displaced relative to the outside. However, no direct measures have been taken to prevent friction between absorbent articles and the wearer's skin.

In view of the above, a main subject of the present invention is to provide an absorbent article that makes friction between the absorbent article and the wearer's skin less likely to occur when worn.

In order to solve the above-mentioned problems, the present invention of claim 1 provides an absorbent article having a non-skin side surface of a main body portion with an absorber interposed between a surface sheet on the skin side and a back sheet on the non-skin side. Absorbent articles with anti-displacement components fixed to the outside.

It is characterized in that a shear deformation layer is provided between the absorbent body and the displacement prevention member, and the shear deformation layer is formed into a member disposed on the skin side of the shear deformation layer and a member disposed on the skin side of the shear deformation layer. The non-skin side members of the shear deformation layer can be relatively displaced in the surface direction.

In the invention described in the above item 1, a shear deformation layer is provided between the absorbent body and the displacement prevention member provided on the non-skin side of the absorbent article, and the arrangement is formed by shear deformation of the shear deformation layer. The material on the skin side of the shear deformation layer and the material on the non-skin side of the shear deformation layer can be relatively displaced in the surface direction. Therefore, even when the absorbent article is worn, external posture changes due to movement of the feet, etc. When the changes in the wearer's movements cause twists or wrinkles, causing the outside to be relatively displaced relative to the wearer's skin, the shear deformation layer can also be disposed in the shear deformation layer through the shear deformation. When the displacement of the non-skin-side members (including at least the anti-displacement members) does not affect the skin-side members (at least including the surface sheet) arranged in the shear deformation layer, the shear deformation layer is maintained at the position where it is arranged. The state in which the skin-side material of the deformation layer adheres closely to the wearer's skin. In this way, due to the shear deformation of the shear deformation layer, external displacement will not affect the material arranged on the skin side of the shear deformation layer. Therefore, the skin contact surface of the absorbent article is in contact with the wearer's skin when worn. Friction between the fabrics becomes less likely to occur, thereby suppressing the wearer's itching or pain from deteriorating the wearer's comfort.

The present invention according to Item 2 provides the absorbent article described in Item 1, which wherein the shear deformation layer is composed of foamed resin.

In the invention described in the above item 2, the shear deformation layer is made of a foamed resin obtained by foaming a synthetic resin such as polypropylene, polyethylene, styrene, etc. into a porous form that can obtain a large shear strain. (plastic foam).

The present invention according to Item 3 provides the absorbent article according to Item 1 or 2, wherein the shear deformation layer is provided on the non-skin side of the back sheet, and the displacement preventing member is provided on the shear deformation layer. The non-skin side of the layer.

The invention described in the above item 3 is an embodiment of the arrangement position of the shear deformation layer, in which the shear deformation layer is disposed on the non-skin side of the back sheet, and the displacement prevention member is disposed on the back sheet. The non-skin side of the aforementioned shear deformation layer. That is, the surface sheet, absorber, and back sheet are arranged on the skin side of the shear deformation layer, so that these materials can be maintained in a state of being integrally adhered to the skin.

The invention of Item 4 provides the absorbent article according to Item 1 or 2, wherein the shear deformation layer is provided between the absorbent body and the back sheet, and the displacement prevention member is provided on the back sheet. The non-skin side of the material.

The invention described in the above item 4 relates to another embodiment of the arrangement position of the shear deformation layer, in which the shear deformation layer is disposed between the absorber and the back sheet, and the displacement prevention member is disposed On the non-skin side of the aforementioned back sheet. That is, the surface sheet and the absorber are arranged on the skin side of the shear deformation layer, so that these materials can be maintained in a state of being integrally adhered to the skin.

The invention according to Item 5 provides the absorbent article according to any one of Items 1 to 4, wherein the displacement-preventing member is provided at a position overlapped with the shear deformation layer in the thickness direction. overlapping area.

In the invention described in Item 5 above, since the displacement prevention member is provided in a region overlapping the shear deformation layer in the thickness direction, it is possible to maintain the non-skin side of the shear deformation layer fixed to the outside and to dispose it on the shear deformation layer. The state in which the skin-side material of the shear layer adheres closely to the wearer's skin.

The present invention according to Item 6 provides the absorbent article according to any one of Items 1 to 5, wherein the displacement-preventing member is composed of an adhesive layer or a hook member.

In the invention described in Item 6 above, an adhesive layer or a hook member is used as the displacement preventing member. When the wearer is wearing underwear such as underwear in addition to the absorbent article, an adhesive layer is ideally used as the anti-displacement member; when it is a diaper outer body, etc., it is ideal to use an adhesive layer that can be mechanically bonded to the inner surface of the diaper outer body. Hook material.

As described in detail above, according to the present invention, friction between the absorbent article and the wearer's skin becomes less likely to occur when wearing it.

1: sanitary napkin for menstrual use

2: Back sheet

3:Surface sheet

4:Absorbent body

5: Wrapping sheet

6:Second sheet

7: Side sheet

10: Shear deformation layer

11: Anti-displacement adhesive layer

[Fig. 1] is a partially broken and developed view of the sanitary napkin 1 of the present invention.

[Figure 2] is a view of the II-II line arrow in Figure 1.

[Fig. 3] A cross-sectional view of the sanitary napkin 1 showing the deformation state when the wearer moves.

[Figure 4] Cross section of sanitary napkin 1 provided with shear deformation layer 10 of the second example Figure.

[Fig. 5] A cross-sectional view of the sanitary napkin 1 provided with the shear deformation layer 10 of the third example.

[Fig. 6] A rear view of the sanitary napkin 1 provided with the shear deformation layer 10 of the fourth example.

[Figure 7] is the view of the VII-VII line arrow in Figure 6.

[Fig. 8] The rear view of the sanitary napkin 1 provided with the shear deformation layer 10 of the fifth example.

The embodiments of the present invention will be described in detail below with reference to the drawings.

[Basic composition of sanitary napkins 1]

The sanitary napkin 1 of the present invention, as shown in Figures 1 and 2, is a liquid-impermeable back sheet 2 composed of a polyethylene sheet, a polypropylene sheet, etc., which can quickly absorb menstrual blood or secretions, etc. The liquid-permeable surface sheet 3 and the absorbent body 4 composed of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3 are used to maintain the shape of the absorbent body 4 and improve the diffusibility. A wrapping sheet 5 made of crepe paper or non-woven fabric surrounding the absorbent body 4, a hydrophilic second sheet 6 disposed between the surface sheet 3 and the absorbent body 4 as necessary, and the skin contact surface Both sides of the side are composed of side sheets 7 and 7 arranged along the longitudinal direction respectively. In addition, around the absorbent body 4, at the front and rear ends in the longitudinal direction of the sanitary napkin, and at the outer edges of the back sheet 2 and the surface sheet 3, adhesives such as hot melt glue or heat sealing or ultrasonic sealing are used. They are joined by joining means such as sealing, and the two side edges thereof extend laterally than the side edges of the absorbent body 4 as described above. The back sheet 2 and the side sheet 7 are joined by an adhesive such as hot melt glue or a joining means such as heat sealing or ultrasonic sealing, and an outer peripheral flap portion without the absorber 4 is formed on the outer periphery.

The structure of the aforementioned sanitary napkin 1 will be further described in detail below:

The back sheet 2 is made of an olefin-based resin sheet such as polyethylene or polypropylene that has at least water-blocking properties. Alternatively, a non-woven fabric laminated on a polyethylene sheet or the like may be used. A nonwoven fabric may be laminated, or a nonwoven fabric sheet may be used while substantially ensuring liquid impermeability by interposing a waterproof film (in this case, the liquid impermeable back sheet is composed of a waterproof film and a nonwoven fabric). In recent years, from the viewpoint of preventing stuffy heat, those with moisture permeability tend to be used. This water-blocking and moisture-permeable sheet is a microporous sheet obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then extending it in one or two axial directions. material.

The aforementioned surface sheet 3 is suitable for use of porous or non-porous non-woven fabrics. The material fibers constituting the nonwoven fabric may be, in addition to synthetic fibers such as olefin-based, polyester-based, polyamide-based, such as polyethylene or polypropylene, regenerated fibers such as rayon or cuprammonium, or natural fibers such as cotton. , and non-woven fabrics obtained by appropriate processing methods such as water needling, spun bonding, hot melt bonding, melt blowing, and needle rolling can be used. Among these processing methods, the advantage of the water needling method is that it is rich in softness, the advantage of the spun bonding method is that it is rich in drape, and the advantages of the hot melt bonding method and the ventilation method are that it is fluffy and has high compression recovery. The fibers of the nonwoven fabric can be either long fibers or short fibers, but it is ideal to use short fibers to give the texture of a towel. In addition, in order to facilitate the embossing process, it is preferable to use olefin fibers such as polyethylene or polypropylene with a low melting point. In addition, composite fibers such as core-sheath type fibers, in which a fiber with a high melting point serves as a core and a fiber with a low melting point serves as a sheath, or a side-by-side type fiber or a split type fiber, can also be suitably used.

The absorbent body 4 interposed between the back sheet 2 and the surface sheet 3 is, for example, pulp mixed with a super absorbent resin, or pulp mixed with chemical fibers and a super absorbent resin. The absorbent body 4, as shown in the figure, is ideally surrounded by a wrapping sheet 5 made of crepe paper or non-woven fabric to maintain its shape, quickly diffuse menstrual blood, etc., and prevent the absorbed menstrual blood, etc. from flowing back. The aforementioned pulp may be composed of cellulose fibers such as chemical pulp or molten pulp obtained from wood, or artificial cellulose fibers such as rayon or acetate, and is superior in functionality and price compared to hardwood pulp. It is more suitable to use conifer pulp with longer fiber length. In addition, the aforementioned absorbent body 4 may also be an airlaid absorbent body 4 that can be reduced in size, or a polymer sheet in which a super absorbent resin is placed between two layers of nonwoven fabric.

In addition, synthetic fibers may be mixed with the absorbent body 4 . The aforementioned synthetic fibers include, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate or polybutylene terephthalate, polyamides such as nylon, and These copolymers may also be a mixture of these two types. In addition, composite fibers such as core-sheath type fibers, which have a fiber with a high melting point as a core and a fiber with a low melting point as a sheath, parallel type fibers, split type fibers, etc. can also be used. In order to make the aforementioned synthetic fibers have affinity for body fluids, in the case of hydrophobic fibers, those that have been surface-treated with a hydrophilizing agent are preferably used.

The wrapping sheet 5 surrounding the absorbent body 4 can be made of tissue paper, crepe paper such as tissue paper, or nonwoven fabric. The fiber material constituting the crepe paper is ideally composed of 100% pulp fiber, and is ideally used for tissue paper or coniferous tree pulp and broadleaf tree pulp. The aforementioned non-woven fabrics are suitable for spunbond non-woven fabrics or spunbond/meltblown/spunbond (SMS) non-woven fabrics (SMS, SSMMS, etc.), and their materials can be polypropylene, polyethylene/polypropylene composite materials wait. As in this example, when the wrapping sheet 5 surrounding the absorber 4 is provided, the result is The wrapping sheet 5 is interposed between the surface sheet 3 and the absorbent body 4. The wrapping sheet 5, which is excellent in absorbency, can quickly diffuse body fluids and prevent the reverse flow of menstrual blood and the like.

The second sheet 6 may be any one that is hydrophilic to body fluids. Specifically, the material itself can be hydrophilic by using regenerated fibers such as rayon or cuprammonium, natural fibers such as cotton, or using olefin-based, polyester-based, polyester-based fibers such as polyethylene or polypropylene. Synthetic fibers such as amide-based fibers are surface-treated with a hydrophilizing agent to render them hydrophilic. In addition, in order to make the second sheet 6 tough, it may have a porous film layer on the back side (absorbent body 4 side), or it may be a laminated sheet with a wrapping sheet, or a material containing pulp may be used.

On the other hand, on both sides of the skin contact surface of the sanitary napkin 1, side sheets 7, 7 are provided along the longitudinal direction and almost over the entire length of the sanitary napkin 1. This side sheet 7 , 7 extends laterally, and a part of the back sheet 2 that also extends laterally forms wing-like flaps W, W protruding outward on both sides of the body part. The aforementioned wing-shaped flaps W and W are used to fold the fold line RL (Fig. 1) at the base end portion outward when wearing, so that it wraps around the crotch part of the underwear, so that the back panel of the wing-shaped flap W The anti-displacement adhesive layer (not shown) provided on the outside of the material 2 is attached to the outside of the underwear, thereby preventing the underwear from shifting.

The side sheet 7 can be made of water-repellent treated nonwoven fabric or hydrophilic treated nonwoven fabric from the viewpoint of important functions. For example, if the function of preventing menstrual blood or secretions from penetrating or improving the skin feel is important, it is ideal to use a water-repellent treated nonwoven fabric coated with a silicone-based, paraffin-based, or alkyl chromium chloride-based water-repellent agent. In addition, if emphasis is placed on the absorbability of menstrual blood, etc., of the aforementioned wing-shaped flaps W and W, it is ideal to be used in the manufacturing process of synthetic fibers by using hydrophilic groups. Compounds, such as a method of coexisting and polymerizing the oxidation product of polyethylene glycol, or a method of treating the surface with a metal salt such as tin tetrachloride to make the surface part porous and precipitating a metal hydroxide, etc. A hydrophilic treated nonwoven fabric that swells or makes synthetic fibers porous and imparts hydrophilicity using capillary action.

The non-skin side of the main body portion with the absorber 4 interposed between the front sheet 3 and the back sheet 2 is provided with an anti-displacement adhesive layer 11 for fixing to the underwear (outer), as described in detail in the following paragraph.

[Shear deformation layer]

(Example 1)

In the sanitary napkin 1 of the present invention, as shown in Figures 1 and 2, a shear deformation layer 10 is provided between the absorbent body 4 and the anti-displacement adhesive layer 11. By the shear deformation layer 10 The shear deformation is formed so that the member arranged on the skin side of the shear deformation layer 10 and the member arranged on the non-skin side of the shear deformation layer 10 can be relatively displaced in the surface direction.

In the embodiment shown in FIGS. 1 and 2 , the shear deformation layer 10 is provided on the non-skin side of the back sheet 2 , and the anti-displacement adhesive layer 11 is provided on the non-skin side of the shear deformation layer 10 . Side of skin. In this case, the members arranged on the skin side of the above-mentioned shear deformation layer 10 are the surface sheet 3, the second sheet 6, the absorbent body 4 and the wrapping sheet 5, as well as the back sheet 2 and the side sheet. 7 is disposed on the skin side of the shear deformation layer 10; the material disposed on the non-skin side of the shear deformation layer 10 is the anti-displacement adhesive layer 11, the underwear and the outside of the underwear when worn. Fold the back sheet 2 and the side sheet 7 of the wing-shaped flap W of the crotch part of the underwear so that it wraps around it.

Therefore, as shown in Figure 3, even when the sanitary napkin 1 is worn, the underwear When the underwear is relatively displaced relative to the wearer's skin due to twists or wrinkles caused by the wearer's movements that change the posture, such as foot movements, the shear deformation of the shear deformation layer 10 can also be used to form the shear deformation. When the displacement of the components disposed on the non-skin side of the shear deformation layer 10 including the aforementioned displacement-preventing adhesive layer 11 and underwear does not affect the components disposed on the skin side of the aforementioned shear deformation layer 10, the position can be maintained at The material arranged on the skin side of the shear deformation layer 10 is in a state of close contact with the wearer's skin. That is, as shown in FIG. 3(A) , when the underwear moves to the right in accordance with the movement of the wearer, the member disposed on the skin side of the shear deformation layer 10 changes due to the wearer's skin surface and physiological hygiene. The friction force on the surface of the cotton 1 attempts to maintain a state of close contact with the skin surface, so that a specified shear force acts on the shear deformation layer 10 . The shear deformation layer 10 is shear-deformed in response to this shearing force, so that the member disposed on the skin side of the shear deformation layer 10 is maintained in a state of close contact with the skin, and the underwear moves to the right side. On the other hand, as shown in FIG. 3(B) , when the underwear moves to the left in accordance with the movement of the wearer, a specified shear force acts on the shear deformation layer 10, and the shear deformation layer 10 is formed by shearing. The deformation causes the member disposed on the skin side of the shear deformation layer 10 to maintain a state of close contact with the skin and at the same time, the underwear moves to the left. In this way, the shear deformation layer 10 maintains a state of close contact between the member disposed on the skin side of the shear deformation layer 10 and the skin through shear deformation. Therefore, the skin contact surface of the sanitary napkin 1 is in contact with the wearer when worn. Friction between the user's skin becomes less likely to occur, thereby suppressing the worsening of discomfort such as itching or pain.

The shear deformation layer 10 is formed in a planar shape that is almost the same as or smaller than the absorber 4 in the plan view shown in FIG. 1 . In the example shown in FIG. 1 , the shear deformation layer 10 is formed in a flat plate shape that is substantially quadrangular in plan view and covers almost the entire absorbent body 4 . However, as will be explained in detail later, the shear deformation layer 10 may also be formed in the width direction. and/or formed from multiple parts divided in the longitudinal direction. In addition, the area where the aforementioned shear deformation layer 10 is arranged is even if it is not a suction Almost the entire body 4 is only the long side section corresponding to the body fluid discharge part H of the wearer, that is, the long side section formed by the wing-shaped flaps W on both sides, and is not provided on the front and rear sides. Yes.

The shear deformation layer 10 can be any conventional material without limitation as long as it is a material with large shear strain. For example, porous foam composed of polypropylene, polyethylene, styrene, etc. Resin (plastic foam); natural sponge made of spongy fibers such as sponges; thick non-woven fabric made of crimped fibers or non-curled fibers. Among them, it is preferable to use a foamed resin that has good compression recovery properties, has a certain degree of strength and durability as a structural member, and has a large amount of movement in the plane direction when shearing force acts. In order to prevent stuffiness during wearing, the foamed resin preferably uses a continuous cell structure with continuous internal cells and air permeability.

The thickness of the aforementioned shear deformation layer 10 is arbitrary. Generally speaking, when the same shear force is applied, the thicker the thickness, the greater the relative displacement of the two surfaces. Ideally, when a specified shearing force is applied, the relative displacement amount of both sides can obtain a thickness of 0.3mm or more, ideally 0.9mm or more. In particular, when the aforementioned shear deformation layer 10 uses nonwoven fabric, the thickness is 0.3~5.0mm, ideally 0.9~4.0mm, and the basis weight is 30~400g/ ^m2 , ideally 70~300g/ ^m2 . good.

When the shear deformation layer 10 is provided on the non-skin side of the back sheet 2, the non-skin side of the shear deformation layer 10 is provided with an anti-displacement adhesive layer 11 for external fixation to underwear or the like. In the example shown in the figure, although there are three anti-displacement adhesive layers 11 along the length of the sanitary napkin 1 and spaced apart in the width direction, it can also be one or two, or More than 4 strips. In addition, a plurality of strips may be provided along the width direction of the sanitary napkin 1 and at intervals in the longitudinal direction. Furthermore, the strips may be disposed in the aforementioned shear deformation direction. Tier 10 is almost comprehensive.

The aforementioned anti-displacement adhesive layer 11 is covered by an easily peelable release sheet (not shown) when the sanitary napkin 1 is individually packaged. The release sheet is torn apart during use. The position of the anti-displacement adhesive layer 11 exposed is fixed to the outside. In addition, a mechanically joined hook member may be used instead of the aforementioned anti-displacement adhesive layer 11 . The hook member is particularly suitable when the absorbent article is composed of an inner pad attached to the inner surface (outside) of a diaper outer body (exterior) such as an adult diaper.

(Type 2 example)

Next, the shear deformation layer 10 of the second example is explained: In this second example, as shown in FIG. 4 , the shear deformation layer 10 is provided between the absorber 4 and the back sheet 2 , and dispose the anti-displacement adhesive layer 11 on the non-skin side of the back sheet 2 . In this case, the members arranged on the skin side of the above-mentioned shear deformation layer 10 refer to the surface sheet 3, the second sheet 6, the absorbent body 4, the wrapping sheet 5, and the side sheets 7 arranged on The skin-side portion of the surface sheet 3; the non-skin-side member disposed on the shear deformation layer 10 refers to the back sheet 2, the anti-displacement adhesive layer 11, the underwear and the parts that reflect the outside of the underwear when worn. Fold the portion of the side sheet 7 of the wing-shaped flap W so that it wraps around the crotch portion of the underwear.

The shear deformation layer 10 is preferably one that is liquid-permeable but does not have a liquid-absorbing function. Specifically, a foamed resin is used. Thereby, the liquid will pass through the shear deformation layer 10, but the liquid will not be retained in the shear deformation layer 10. Therefore, even if it becomes a wet state, it can still undergo shear deformation in the same way as in a dry state.

By disposing the shear deformation layer 10 between the absorbent body 4 and the back sheet 2, the anti-displacement adhesive layer 11 is disposed in the same form as a normal sanitary napkin 1. The outside of the back sheet 2 can therefore more reliably prevent the underwear from shifting.

In order to make the relative displacement easily absorbed by the shear deformation of the shear deformation layer 10, that is, in order to make the displacement of the underwear less likely to affect the components arranged on the skin side of the shear deformation layer 10, the Among the members on the skin side of the shear deformation layer 10, the member extending outward from the outer edge of the shear deformation layer 10 and disposed between this extension and the non-skin side of the shear deformation layer 10 (back sheet 2 ) The aforementioned extended portion of the joined members (the surface sheet 3, the second sheet 6, and the side sheet 7) may also be provided with a structure allowing the aforementioned shear deformation between the joining portion with the aforementioned back sheet 2. The slack part where the member arranged on the non-skin side of layer 10 moves in the surface direction.

(Third type example)

As shown in FIG. 5 , the shear deformation layer 10 can also be provided on the non-skin side of the back sheet 2 and simultaneously between the absorbent body 4 and the back sheet 2 . That is, the shear deformation layer 10 may be arranged in two upper and lower stages so as to sandwich the back sheet 2 . Thereby, the relative displacement between the underwear and the wearer's skin can be more reliably absorbed by the shear deformation layers 10 and 10 . In this case, the anti-displacement adhesive layer 11 is provided on the non-skin side of the shear deformation layer 10 disposed on the non-skin side.

(Example 4th type)

As shown in FIGS. 6 and 7 , a plurality of the shear deformation layers 10 may be arranged along the longitudinal direction of the sanitary napkin 1 and at predetermined intervals in the width direction. An anti-displacement adhesive layer 11 is disposed on the non-skin side of each shear deformation layer 10 . In this way, by dividing the shear deformation layer 10 and arranging it in plural, the shear deformation layer 10 becomes easy to shear deform, so that the friction between the sanitary napkin 1 and the wearer's skin is further reduced, and the wearing feeling becomes better.

In the example shown in the figure, the shear deformation layer 10 is provided on a non-stop surface of the back sheet 2 . The side of the skin can also be disposed between the absorbent body 4 and the back sheet 2, or can also be disposed at these two places. In addition, a plurality of the shear deformation layers 10 may be arranged along the width direction of the sanitary napkin 1 and at predetermined intervals in the longitudinal direction. However, due to the displacement of the underwear accompanying the movement of the wearer, the amount of displacement along the width direction of the sanitary napkin 1 is larger than the amount of displacement along the longitudinal direction of the sanitary napkin 1. Therefore, the shear deformation layer 10 is preferably formed in plural along the longitudinal direction of the sanitary napkin 1 and at intervals in the width direction.

(Example 5th type)

As shown in FIG. 8 , the aforementioned shear deformation layers 10 may also be arranged in plural at specified intervals in the longitudinal direction and width direction of the sanitary napkin 1 . By independently arranging a plurality of shear deformation layers 10 in the longitudinal direction and the width direction, each shear deformation layer 10 becomes easy to shear and deform, and becomes easy to absorb the contact between the underwear and the wearer's skin. At the same time, each shear deformation layer 10 can independently shear and deform with different deformation amounts. Therefore, the shear deformation layers 10 provided in each part can deform in response to different relative displacement amounts according to each part of the body.

The planar shape of each shear deformation layer 10 is arbitrary and can be formed in a conventional shape, but ideally, it is a circle having no directionality of shear deformation.

In the illustrated example, the shear deformation layer 10 is provided on the non-skin side of the back sheet 2, but it may also be provided between the absorbent body 4 and the back sheet 2, or may be provided at these two places.

1: sanitary napkin for menstrual use

2: Back sheet

3:Surface sheet

4:Absorbent body

5: Wrapping sheet

6:Second sheet

7: Side sheet

10: Shear deformation layer

11: Anti-displacement adhesive layer

Claims (3)

An absorbent article having a main body portion with an absorber interposed between a surface sheet on the skin side and a back sheet on the non-skin side. The non-skin side of the main body is provided with an anti-displacement member for external fixation. , which is characterized by: having a shear deformation layer provided on the non-skin side of the aforementioned back sheet, and the aforementioned anti-displacement member being provided on the non-skin side of the aforementioned shear deformation layer; or having a shear deformation layer provided on the aforementioned side. between the absorbent body and the back sheet, and the displacement prevention member is provided on the non-skin side of the back sheet; the planar shape of the shear deformation layer is circular, extending in the longitudinal direction and width direction of the absorbent article A plurality of them are arranged independently with designated intervals on each side; by shear deformation of the shear deformation layer, a member arranged on the skin side of the shear deformation layer and a member arranged on the non-skin side of the shear deformation layer are formed. The components can be displaced relative to the surface direction. In the absorbent article described in claim 1, the shear deformation layer is made of foamed resin. For example, in the absorbent article described in Item 1 or 2 of the patent application, the aforementioned anti-displacement member is composed of an adhesive layer or a hook member.

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