JP7090540B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article.

Absorbent articles such as menstrual napkins, panty liners, and incontinence pads prevent the wearer's excrement from leaking and are worn for long periods of time while in contact with the wearer's crotch. , It is required to fit the body well and comfortably.

The absorbent article may be used by being attached to the skin-facing surface side of the garment. One of the means for adhering the absorbent article to the garment is to provide an adhesive material on the side facing the garment of the absorbent article.

In Patent Document 1, an absorber is interposed between a front sheet having liquid permeability and a back sheet having liquid impermeableness, and an adhesive layer for preventing slippage by a hot melt adhesive is provided on the outer surface side. In the insertable disposable absorbent article, the non-woven fabric is provided on the outer surface of the back sheet having liquid impermeableness, and the non-woven fabric has a grain size of 14 to 18 g / m ² . Disclose the goods.

Patent Document 2 is an absorbent article provided with a liquid-retaining absorbent layer and a liquid-impermeable layer, and provided with a slip-preventing adhesive on a non-skin contact surface, wherein the non-skin contact surface is a fiber aggregate. The slip-preventing adhesive composed of a hot-melt adhesive has a laminated structure of a first layer on the non-skin contact surface side and a second layer laminated on the first layer. The hot melt adhesive constituting the first layer discloses an absorbent article having higher fluidity in the vicinity of the softening point temperature than the hot melt adhesive constituting the second layer. According to the same document, the absorbent article having such a structure does not reduce the adhesive strength of the adhesive even when the non-skin contact surface is composed of fiber aggregates, and conversely, the absorbent article has absorbency. It is stated that it is possible to obtain good anti-slip properties, in which the adhesive does not migrate to the clothes to which the article is fixed or another absorbent article, so-called adhesive residue does not occur.

Patent Document 3 has a contact surface in contact with the skin, a non-contact surface, and a liquid-absorbing core located between both sides thereof, and an adhesive fastening region for clothing is formed on the non-contact surface. An absorbent article for treating excrement liquid, which is a first thermoplastic synthesis having at least a high-density thermoplastic resin bonded to the lower surface of the resin layer on the lower surface side of the core and having a lower density than the resin layer. Disclosed is an absorbent article characterized in that a fiber layer is located and a fastening zone is formed by a pressure-sensitive adhesive applied to the lower surface of the first resin layer. According to the same document, in an absorbent article for excretion treatment having such a structure, the adhesive used as a fixing means to clothing is entangled with the fibers of the synthetic fiber layer even if the adhesive force is weak, and the back surface of the article is described. It is stated that the resin layer prevents the inside of the back sheet from being transferred to the back sheet.

Japanese Unexamined Patent Publication No. 2002-355266 Japanese Unexamined Patent Publication No. 2005-305135 Japanese Unexamined Patent Publication No. 2000-210328

In the absorbent article used by being attached to the clothes by the adhesive material arranged on the facing surface of the clothes, such as the absorbent articles described in Patent Documents 1 to 3, the absorbent article and the wearer are used. It is necessary to attach the absorbent article to an appropriate position of the clothes from the viewpoint of aligning the positional relationship, particularly so that the excretion opening contact area abuts on the wearer's excretion port.

As a method of attaching the absorbent article to the appropriate position of the garment, do not attach the entire adhesive portion of the clothing contact surface of the absorbent article to the garment, but attach only a part of the adhesive portion to align it with the appropriate position. It is conceivable to perform "temporary fixing" several times to align the absorbent article with the appropriate position of the garment, and then perform "main fixing" to attach and fix the entire adhesive portion to the garment.

However, in the absorbent articles described in Patent Documents 1 to 3, the ease of repeated temporary fixing of the absorbent articles has not been considered.

Therefore, an object of the present invention is to provide an absorbent article that can be easily repeatedly temporarily fixed to clothes.

The present inventors have found that the above-mentioned problems can be achieved by the following means:

<< Aspect 1 >>
An absorbent article containing a sheet arranged on the facing surface side of clothing and an adhesive for fixing clothing arranged on the surface facing the facing surface of clothing.
The absorbent article has a virtual fold line for bending the absorbent article so as to overlap the adhesive material in the thickness direction and to be convex on the side facing the clothing in the unfolded state.
The adhesive material has an adhesive portion existing on the surface of the sheet on the clothing facing surface side.
The adhesive portion has a portion around the virtual fold line and an adjacent portion adjacent to the portion around the virtual fold line.
The portion around the virtual fold line is 1 from the virtual fold line in a direction orthogonal to the virtual fold line in the plane of the absorbent article, where d is the average thickness of the absorbent article in the unfolded state. It is a portion within the length range of / 2πd, and the thickness of the peripheral portion of the virtual fold line is larger than the thickness of the adjacent portion.
Absorbent article.

As a method of attaching the absorbent article to an appropriate position of the clothes, it is conceivable to temporarily fix the absorbent article to the clothes, align the position, and then attach the absorbent article.

The absorbent article of the first aspect has a virtual folding line in which the facing surface of clothing is convex, and the absorbent article is bent along the line to form a convex shape, and the convex shape is used as a starting point. , Easy to temporarily fix.

Further, the absorbent article of the first aspect is orthogonal to the virtual fold line in the plane of the absorbent article, where d is the peripheral portion of the adhesive portion, that is, the average thickness of the absorbent article in the unfolded state. Since the thickness of the portion within the range of 1 / 2πd from the virtual fold line is large in the direction of the fold, the adhesive strength of the portion is large. On the other hand, the thickness of the adjacent portion adjacent to the virtual fold line peripheral portion is smaller than that of the virtual fold line peripheral portion, so that the adhesive force is small. Since the peripheral part of the virtual fold line overlaps with the substantially arc portion of the convex part when the absorbent article is bent along the virtual fold line to form a convex shape, the alignment is performed using this convex shape as a starting point. At that time, the absorbent article can be temporarily fixed to the clothes with a high adhesive force, and the absorbent article does not easily shift during the temporary fixing. Further, since the adjacent portion has a small adhesive force, even if the adjacent portion adheres to the clothes at the time of temporary fixing, the portion is easily peeled off when the temporary fixing portion is peeled off and reattached. That is, the absorbent article of the first aspect has few portions that are adhered to the clothes with a high adhesive force at the time of temporary fixing, and the absorbent articles can be easily peeled off from the clothes.

As a result, the absorbent article of the first aspect can be easily attached to an appropriate position when the absorbent article is attached to the clothes.

<< Aspect 2 >>
The sheet is a non-woven fabric and is
The adhesive material has an impregnated portion that is continuous with the adhesive portion and impregnates the nonwoven fabric.
The absorbent article according to aspect 1.

When the absorbent article is temporarily fixed to the clothes, it may be temporarily fixed several times in order to correct the position of the absorbent article with respect to the clothes. The present inventors have repeatedly temporarily fixed the absorbent article, and when the absorbent article is peeled off from the clothes, the adhesive material arranged in the convex portion that is the starting point of the temporary fixing is peeled off. I found that it could be easier. The present inventors have further found that when the adhesive material at the starting point of temporary fixing is peeled off, the adhesive strength of the absorbent article is lowered, and it is difficult to perform temporary fixing again.

In the absorbent article of the second aspect, since a part of the pressure-sensitive adhesive material infiltrates into the nonwoven fabric as a sheet to form an impregnated portion, the portion can give an anchor effect to the pressure-sensitive adhesive material. Therefore, the adhesive material does not easily come off from the non-woven fabric as a sheet. Therefore, it is possible to suppress a decrease in the adhesiveness of the absorbent article even when the temporary fixing is performed a plurality of times.

<< Aspect 3 >>
In the expanded state, the thickness of the portion overlapping the virtual fold line peripheral portion in the thickness direction of the impregnated portion is smaller than the thickness of the portion overlapping the adjacent portion.
The absorbent article according to aspect 2.

In the absorbent article of aspect 3, the thickness of the portion of the impregnated portion that overlaps the peripheral portion of the virtual fold line in the thickness direction is smaller than the thickness of the portion that overlaps the adjacent portion, so that the virtual fold line is used as the starting point. It is easy to bend and can form a sharp convex shape. Therefore, it is possible to more easily align the absorbent article with the clothes.

Further, since the impregnated portion has a large thickness in the portion overlapping the adjacent portion, the adhesive effect of the adhesive is high. Therefore, when the absorbent article is reattached, the adhesive material in the convex portion, which is the starting point of temporary fixing, is less likely to come off. Therefore, when the absorbent article is attached to the clothes, it is easy to attach it to an appropriate position.

<< Aspect 4 >>
The absorbent article according to any one of aspects 1 to 3, wherein the absorbent article has an absorbent body that overlaps with the virtual fold line in the thickness direction in the unfolded state.

When aligning the absorbent article, it is particularly important to align the position of the absorber capable of absorbing excrement and the like to an appropriate position.

The absorbent article of aspect 4 has an absorber that overlaps the virtual fold line in the thickness direction. Therefore, the position of the absorber can be used as a starting point for positioning. Therefore, the absorbent article can be more properly aligned.

<< Aspect 5 >>
The absorbent article has a longitudinal direction and a width direction in the unfolded state, and the virtual fold line is arranged along the width direction.
The absorbent article according to any one of aspects 1 to 4.

In order to properly use the absorbent article, it is desirable to attach the absorbent article to the clothes along the shape of the clothes.

The absorbent article of aspect 5 has a virtual fold line along the width direction. Therefore, by bending the absorbent article along the virtual fold line, it is easy to make a shape that matches the shape of the clothes, and it becomes easier to temporarily fix the clothes to the clothes. Therefore, the absorbent article can be more properly aligned.

<< Aspect 6 >>
The absorbent article has a longitudinal direction and a width direction in the deployed state, and the virtual fold line is arranged along a direction inclined in the width direction.
The absorbent article according to any one of aspects 1 to 4.

When the absorbent article is temporarily fixed, it may be temporarily fixed several times to correct its position. When the absorbent article is removed from the garment, it is usually removed along the longitudinal direction of the absorbent article.

In the absorbent article of the sixth aspect, the portion of the adhesive material having a particularly high adhesiveness, which overlaps with the virtual fold line in the thickness direction, is inclined in the width direction of the absorbent article. Therefore, the length of the portion is shorter in the width direction as compared with the case where the portion is arranged along the width direction. Therefore, when the absorbent article is peeled off from the clothes, the absorbent article can be peeled off from the clothes with a smaller force.

<< Aspect 7 >>
The absorbent article has an anterior region, an excretion opening contact region, and a posterior region in the longitudinal direction in the deployed state, and the virtual fold line is the anterior region and the posterior region. Located in each of the
The absorbent article according to aspect 5 or 6.

When aligning the absorbent article, it is especially important to align the anterior and posterior regions of the absorbent article to the proper position.

The absorbent article of aspect 7 has a structure in which virtual fold lines are arranged in each of the front region and the posterior region. Therefore, the front side region and the rear side region can be used as the starting point for positioning. Therefore, the absorbent article can be more properly aligned.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an absorbent article that is easily repeatedly temporarily fixed to clothing.

FIG. 1 is a plan view of the unfolded state of the menstrual napkin 100 according to the first embodiment of the absorbent article of the present invention as viewed from the skin facing surface side. FIG. 2 is a plan view of the unfolded state of the menstrual napkin 100 according to the first embodiment of the absorbent article of the present invention, as viewed from the side facing the clothing. FIG. 3A is a cross-sectional view taken along the line AA'in FIG. FIG. 3B is an enlarged view of the region X1 in FIG. 3A. FIG. 4A is a schematic view showing a state in which a menstrual napkin 100 according to the first embodiment of the absorbent article of the present invention is temporarily fixed to clothing. 4B is an enlarged view of the region X2 in FIG. 4A. FIG. 5A is a schematic view showing a state in which the adhesive material impregnates the non-woven fabric in the sanitary napkin 100 according to the second embodiment of the absorbent article of the present invention. FIG. 5B is a schematic view showing a state in which the adhesive material impregnates the non-woven fabric in the sanitary napkin 100 according to the third embodiment of the absorbent article of the present invention. FIG. 6 is a plan view of the unfolded state of the menstrual napkin 100 according to the fourth embodiment of the absorbent article of the present invention as viewed from the clothing facing surface side. FIG. 7 is a cross-sectional view taken along a line similar to the line AA'in FIG. 2 in a state where the menstrual napkin 100 according to the fifth embodiment of the absorbent article of the present invention is unfolded.

Hereinafter, embodiments of the present invention will be described in detail. The present invention is not limited to the following embodiments, but can be variously modified and implemented within the scope of the main purpose of the invention.

In the present specification, the “clothing facing surface” refers to the surface of the absorbent article on the side facing the clothing when worn. Further, in the present specification, the “skin facing surface” refers to the surface of the absorbent article on the side facing the user's skin when worn.

In the present specification, the "expanded state" means a state in which the absorbent article is not folded back, and more specifically, a state in which the absorbent article is stretched into a substantially flat surface so as not to have a crease.

In the present specification, the "longitudinal direction" indicates the long direction of the length of the vertically long absorbent article in the "expanded state" of the absorbent article, and the "width direction" indicates the "expanded state" of the absorbent article. In ", means a direction perpendicular to the thickness direction of the absorbent article and orthogonal to the" longitudinal direction ".

As used herein, the "anterior region" is the region at a position corresponding to the anterior side of the wearer's body when the absorbent article is worn. Further, the "excretion port contact area" is a region at a position where the wearer's excretion port is in contact with the wearable article when the absorbent article is worn. Here, when the absorbent article is provided with a wing, the excretion opening contact area may overlap with the installation area of the wing in the width direction. Further, the center in the longitudinal direction and the center in the width direction of the cloaca contact area may overlap with the center in the longitudinal direction of the wing installation area and the center in the width direction between the two wing installation areas, respectively. .. Further, the "rear region" is a region at a position corresponding to the posterior side of the wearer's body when the absorbent article is worn.

<< Absorbent article >>
The absorbent article of the present invention is an absorbent article containing a sheet arranged on the clothing facing surface side and an adhesive material for fixing clothing arranged on the surface of the sheet on the clothing facing surface side.

The absorbent article of the present invention has a virtual fold line for bending the absorbent article so as to overlap with the adhesive material in the thickness direction and to be convex on the side facing the clothing in the unfolded state. Here, the adhesive material has an adhesive portion existing on the surface of the sheet on the clothing facing surface side. Further, the adhesive portion has a portion around the virtual fold line and an adjacent portion adjacent to the portion around the virtual fold line. The peripheral portion of the virtual fold line has a length of 1 / 2πd from the virtual fold line in the direction orthogonal to the virtual fold line in the plane of the absorbent article, where d is the average thickness of the absorbent article in the unfolded state. It is a part within the range. The thickness of the peripheral portion of the virtual fold line is larger than the thickness of the adjacent portion.

The absorbent article of the present invention is orthogonal to the virtual fold line in the plane of the absorbent article, where d is the peripheral portion of the adhesive portion, that is, the average thickness of the absorbent article in the unfolded state. Since the thickness of the portion within the range of 1 / 2πd from the virtual fold line in the direction is large, the adhesive force of the portion is large. Therefore, when the absorbent article is bent along the virtual fold line to form a convex shape, the thickness of the adhesive material around the virtual fold line that overlaps with the substantially arc portion of the convex portion is large. When aligning with the shape as the starting point, the absorbent article can be temporarily fixed to the clothes with high adhesive force, and the absorbent article is less likely to shift during the temporary fixing. On the other hand, since the thickness of the adjacent portion adjacent to the peripheral portion of the virtual fold line is smaller than that of the peripheral portion of the virtual fold line, the adhesive force is small. Therefore, even if the adjacent portion adheres to the clothes at the time of temporary fixing, it is easy to peel off the portion when the temporary fixing portion is peeled off and reattached. Therefore, when the temporarily fixed portion is peeled off and reattached, there are few portions bonded with high adhesive force, and the absorbent article can be easily peeled off from the clothes.

As a result, the absorbent article of the present invention can be easily attached to an appropriate position when the absorbent article is attached to clothing.

Further, the absorbent article of the present invention may have an absorber that overlaps with the virtual fold line in the thickness direction in the unfolded state.

When aligning the absorbent article, it is particularly important to align the position of the absorber capable of absorbing excrement and the like to an appropriate position.

When the absorbent article has an absorber that overlaps the virtual fold line in the thickness direction, the position of the absorber can be used as a starting point for alignment. This allows the absorbent article to be more properly aligned.

The absorbent article of the present invention is not particularly limited as long as it is an absorbent article used by being attached to clothing, and specifically, it may be a menstrual napkin, a panty liner, an incontinence pad or the like.

When the absorbent article of the present invention is a menstrual napkin, as a specific configuration, for example, it has a side sheet, a front surface sheet, an absorber, and a back surface sheet from the skin facing surface side to the clothing facing surface side. However, it is not limited to such a configuration. In such a configuration, the back surface sheet is a sheet arranged on the clothing facing surface side.

The clothing to which the absorbent article of the present invention is applied may be, for example, underwear, but is not particularly limited.

1 to 3B are schematic views showing a menstrual napkin 100 according to one embodiment of the present invention, respectively.

As shown in FIGS. 1 to 3B, the menstrual napkin 100 has a side sheet 3, a front surface sheet 1, an absorber 2, and a back surface sheet 5 in this order from the skin facing surface side to the clothing facing surface side. There is.

As shown in FIG. 1, the sanitary napkin 100 has virtual folding lines L ₁ to L ₃ parallel to the width direction W and for bending the absorbent article so that the facing surface side of the clothing is convex. ing. In addition, in FIG. 1, the absorber 2 has a groove 4. The groove 4 makes it easy for the menstrual napkin 100 to bend along the shape of the wearer's body when the menstrual napkin 100 is worn.

Further, as shown in FIG. 2, an adhesive material 6 for fixing clothes is arranged on the surface of the back surface sheet 5 on the side facing the clothes. Here, the virtual fold lines L ₁ to L ₃ overlap with the adhesive material 6 in the thickness direction.

FIG. 3A is a cross-sectional view taken along the line AA'in FIG. As shown in FIG. 3A, the menstrual napkin 100 has lines L _1'to L _3'that are orthogonal to the virtual fold lines L ₁ to L ₃ and parallel to the thickness direction T of the menstrual napkin 100. There is. Then, as shown in FIG. 3B, which is an enlarged view of the portion X1 in FIG. 3A, the portion of the adhesive material 6 that overlaps with the line _L1'and the peripheral portion thereof correspond to the virtual fold line peripheral portion _R1 . Although not shown, the same applies to the portion of the adhesive material 6 that overlaps with the lines L _{2'and L 3 '} .

Here, FIGS. 1 to 3B do not limit the shape or structure of the absorbent article of the present invention. In particular, the side sheet, surface sheet and absorber are not essential configurations of the absorbent article of the present invention. The back surface sheet is a sheet arranged on the side facing the clothes.

4A and 4B are schematic views showing a state in which the menstrual napkin 100 according to the first embodiment of the present invention is temporarily fixed to the clothes, respectively.

As shown in FIG. 4A, the front side and the rear side of the menstrual napkin 100 can be held and temporarily fixed to the clothes 200 while being bent according to the shape of the clothes 200. Here, by bending the absorbent article so as to be convex toward the clothing side from the virtual fold line portion as a starting point to form a convex shape, and using this convex shape portion as the starting point, the alignment in the temporary fixing can be easily performed. Become.

Then, as shown in FIG. 4B, the adhesive portion in the convex portion formed by bending the absorbent article along the virtual fold line L ₁ is the virtual fold line peripheral portion _R1 . Here, since the thickness of the peripheral portion R ₁ around the virtual fold line is larger than the thickness of the adjacent portion R ₂ , it is possible to temporarily fix the portion with high adhesive force when aligning with the portion as the starting point. The sanitary napkin 100 does not easily shift during temporary fixing. Further, since the adjacent portion R ₂ has a small adhesive force, when the temporarily fixed portion is peeled off and reattached, there are few portions bonded with a high adhesive force, so that it is easy to peel off.

Further, as shown in FIGS. ₁ to 3A, in the sanitary napkin 100, the absorber ₂ overlaps with the virtual fold lines L1 to L3 in the thickness direction in the unfolded state. Therefore, when the sanitary napkin 100 is aligned with the clothing 200 as shown in FIG. 4A, the position of the absorbent body 2 and the convex portion overlapping in the thickness direction of the absorbent article are the starting points. Can be matched. Therefore, the menstrual napkin 100 can be more properly aligned.

<Sheet>
In the present invention, the absorbent article has a sheet arranged on the clothing facing surface side. The sheet may be any sheet that can be used as a base material for attaching the absorbent article to the clothing. The sheet may be, for example, a film or a non-woven fabric, but is not limited thereto.

When the sheet is a film, the sheet may be a synthetic resin film made of, for example, a polyethylene resin or a polyolefin resin.

When the sheet is a non-woven fabric, the sheet can be any non-woven fabric such as spunlace non-woven fabric, air-through non-woven fabric, spunbond non-woven fabric, point-bond non-woven fabric, melt-blown non-woven fabric, and a combination thereof (for example, SMS non-woven fabric, etc.). ..

Further, the type of fiber used for such a non-woven fabric is not particularly limited, and examples thereof include cellulose-based fibers; hydrophilic fibers such as thermoplastic resin fibers such as olefin-based resins and polyester-based resins that have been hydrophilized. These fibers may be used alone or in combination of two or more types.

When the sheet is a non-woven fabric, the sheet may be a hydrophobic or water-repellent non-woven fabric. When the non-woven fabric is a hydrophobic or water-repellent non-woven fabric, the non-woven fabric can impregnate the material of the adhesive material from the viewpoint of further suppressing the movement of the excrement liquid to the lower part of the sheet, and can impregnate the material of the adhesive material at the time of manufacture. It should have a basis weight of 10 to 80 g / m ² from the viewpoint of forming a difference between the thickness of the portion overlapping the virtual fold line of the adhesive portion in the thickness direction and the thickness of the portion adjacent to the portion. preferable. When the basis weight is 10 g / cm ² or more, the thickness of the nonwoven fabric is large, and the thickness of the impregnated portion can be increased. When the basis weight is 80 g / cm ² or less, the thickness of the impregnated portion can be increased while reducing the amount of the adhesive applied. The basis weight may be 10 g / m ² or more, 20 g / m ² or more, or 30 g / m ² or more, and may be 80 g / m ² or less, 60 g / m ² or less, or 50 g / m ² or less. ..

Further, from the viewpoint of further suppressing the movement of the excrement liquid to the lower side of the sheet, it is preferable that a liquid-impermeable film or the like is inserted on the skin-facing surface side of the nonwoven fabric.

<Adhesive material>
In the present invention, the absorbent article has an adhesive material for fixing clothes arranged on the surface of the sheet on the side facing the clothes. The adhesive material is a member for attaching and fixing an absorbent article to clothing at the time of use. Further, the adhesive material has an adhesive portion existing on the surface of the sheet on the side facing the clothing.

In the present invention, when the sheet is a nonwoven fabric, the adhesive material can have an impregnated portion that is continuous with the adhesive portion and impregnates the nonwoven fabric.

The material of the adhesive material is not particularly limited as long as it is an adhesive substance capable of attaching an absorbent article to clothing, and for example, any material that can be used for an absorbent article attached to clothing is used. It may be a material. More specifically, the material of the pressure-sensitive adhesive may be a hot melt adhesive. Examples of the hot melt adhesives include olefins such as polyethylene, polypropylene, and ethylene-α-olefin copolymers; ethylene-vinyl acetate copolymers; polyamides; styrene-butylene-styrene copolymers and styrene-isoprenes. -A thermoplastic elastomer type such as a styrene copolymer; a reaction type hot melt such as a moisture-curable urethane prepolymer and the like can be mentioned.

The adhesive material can be formed by applying a sticky substance as a material onto the sheet by any method, for example, by applying the adhesive substance as a material to the sheet.

The shape of the adhesive may be any shape that allows the absorbent article to be attached to the garment. The shape of the adhesive material may be, but is not limited to, the shape of a plurality of rods extending in the longitudinal direction or the width direction of the absorbent article.

(Adhesive part)
The adhesive portion has a portion around the virtual fold line and an adjacent portion adjacent to the portion around the virtual fold line. Here, the portion around the virtual fold line is 1 / 2πd from the virtual fold line in the direction orthogonal to the virtual fold line in the plane of the absorbent article, where d is the average thickness of the absorbent article in the unfolded state. A portion within the length range, i.e., a portion within the length range of πd about the virtual fold line in a direction orthogonal to the virtual fold line in the plane of the absorbent article. The thickness of the peripheral portion of the virtual fold line is larger than the thickness of the adjacent portion.

The adjacent portion is within the range of πd in the direction opposite to the virtual fold line from the end of the peripheral portion of the virtual fold line in the direction orthogonal to the virtual fold line in the plane of the absorbent article in the adhesive portion. It is a part. The high adhesive region may be located at at least one end of the low adhesive region in the plane of the absorbent article in a direction orthogonal to the virtual fold line.

In the present specification, the average thickness d (mm) of the absorbent article is measured as follows. Prepare FS-60DS [measurement surface 44 mm (diameter), measurement pressure 3 g / cm ² ] manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd. and absorb under standard conditions (temperature 23 ± 2 ° C, relative humidity 50 ± 5%). Five different parts of the sex article are pressurized, the thickness of each part after 10 seconds of pressurization is measured, and the average value of the five measured values is defined as the average thickness d.

The difference between the thickness of the peripheral portion of the virtual fold line and the thickness of the adjacent portion can be formed by any method.

This thickness can be given, for example, by increasing the amount of the adhesive material applied to the clothing facing surface of the sheet to the portion to be the peripheral portion of the virtual fold line and decreasing it to the portion to be the adjacent portion. When this method is used, it is preferable to apply the adhesive material with a viscosity such that the difference in the thickness of the adhesive portion is not eliminated between the peripheral portion of the virtual fold line and the adjacent portion. Such a viscosity can be appropriately selected, for example, by adjusting the temperature of the adhesive material at the time of coating.

Further, this difference in thickness can be determined by, for example, applying the adhesive material to the clothing facing surface of the sheet of the absorbent article, and then bending the absorbent article along the virtual fold line to form a portion along the fold line. It can be formed by pressing the adjacent portion. By such a press, the press pressure is not applied to the portion of the adhesive portion that overlaps with the convex portion formed by bending the absorbent article along the virtual fold line in the thickness direction, and the adjacent portion thereof. Since the press pressure is applied to the adhesive material in the adjacent portion, the adhesive material in the adjacent portion is stretched and the thickness is reduced.

Here, since the peripheral portion of the virtual fold line overlaps with the convex portion in the thickness direction of the absorbent article, the thickness of the peripheral portion of the virtual fold line becomes larger than the thickness of the adjacent portion.

When the sheet is a non-woven fabric, after applying the adhesive material to the sheet, the peripheral portion of the virtual fold line and the adjacent portion are pressed with different press pressures to impregnate the adhesive with the non-woven fabric. A method of giving a difference in the thickness of the peripheral portion of the virtual fold line and the adjacent portion by giving a difference in the amount of the material can be mentioned.

Of the adhesive portions, the thickness of the peripheral portion of the virtual fold line and the thickness of the adjacent portion are the thicknesses of the respective portions in the cross section in the direction orthogonal to the virtual fold line in the plane of the absorbent article in the unfolded state of the absorbent article. It is defined as the average value of the lengths from the clothing facing surface side to the clothing facing surface side of the sheet.

Here, in this cross section, the magnitude relation of the average value of this length can be obtained as the magnitude relation of the area of each portion in the cross section. The magnitude relationship of this area can be obtained visually or by using image analysis software from electron microscope images of these cross sections.

Further, the cross section of the absorbent article can be obtained by cutting the absorbent article soaked in liquid nitrogen and hardened.

(Impregnated part)
In the present invention, when the sheet is a nonwoven fabric, the adhesive material can have an impregnated portion that is continuous with the adhesive portion and impregnates the nonwoven fabric. Here, the adhesive portion and the impregnated portion can be continuous, for example, in the thickness direction of the adhesive material, but may be continuous in other directions.

When the absorbent article is temporarily fixed, it may be temporarily fixed several times to correct the position. The present inventors have repeatedly temporarily fixed the absorbent article, and when the absorbent article is peeled off from the clothes, the adhesive material arranged in the convex portion which is the starting point of the temporary fixing is peeled off. I found that it could be easier. The present inventors have further found that when the adhesive material at the starting point of temporary fixing is peeled off, the adhesive strength of the absorbent article is lowered, and it is difficult to perform temporary fixing again.

The portion of the absorbent article in which a portion of the adhesive material is impregnated in the nonwoven fabric as a sheet, that is, the impregnated portion, can give an anchor effect to the adhesive material. Therefore, the adhesive material does not easily come off from the non-woven fabric as a sheet. Therefore, it is possible to suppress a decrease in the adhesiveness of the absorbent article when the temporary fixing is performed a plurality of times.

FIG. 5A is an enlarged view of a portion of a menstrual napkin according to a second embodiment of the absorbent article of the present invention. FIG. 5A is an enlarged view of a portion similar to X1 in FIG. 3A with respect to the menstrual napkin 100.

In FIG. 5A, the sanitary napkin 100 has a surface sheet 1, an absorber 2, a non-woven fabric 5', and an adhesive 6 in this order from the clothing facing surface side. Here, the adhesive material 6 has an impregnated portion 6b that is continuous with the adhesive portion 6a and impregnates the nonwoven fabric 5'.

As described above, in the sanitary napkin 100 according to the second embodiment of the absorbent article of the present invention, the impregnated portion 6b can give an anchor effect to the adhesive material. Therefore, the adhesive 6 does not easily come off from the nonwoven fabric 5'. Therefore, it is possible to suppress a decrease in the adhesiveness of the absorbent article when the temporary fixing is performed a plurality of times.

Further, in the expanded state, the thickness of the portion overlapping the virtual fold line peripheral portion in the thickness direction of the impregnated portion may be smaller than the thickness of the portion overlapping the adjacent portion.

When the impregnated portion has such a configuration, the impregnated portion in the portion overlapping the virtual fold line peripheral portion in the thickness direction is more than the impregnated portion in the portion overlapping the adjacent portion in the thickness direction. However, since the rigidity is low and it is easy to bend, it is easy to bend the absorbent article from the virtual fold line as a starting point, and a sharp starting point can be formed. Therefore, the alignment of the absorbent article can be facilitated.

Further, the thickness of the impregnated portion in the portion overlapping the adjacent portion in the thickness direction is larger than the thickness of the impregnated portion of the adhesive material in the portion serving as the starting point of temporary fixing, and the anchoring effect of the adhesive material is high. Therefore, when the absorbent article is reattached, the adhesive material in the aligned portion is less likely to come off. Therefore, it is easy to attach the absorbent article to an appropriate position when attaching it to the clothes.

FIG. 5B is an enlarged view of a part of the menstrual napkin 100 according to the third embodiment of the absorbent article of the present invention. FIG. 5B is an enlarged view of a portion similar to X1 in FIG. 3A with respect to the menstrual napkin 100.

In FIG. 5B, the thickness of the portion R _1'of the impregnated portion 6b that overlaps with the virtual fold line peripheral portion R ₁ in the thickness direction is smaller than the thickness of the portion R _{2'that overlaps with the adjacent portion R 2 .} It is the same as FIG. 5A except that.

As described above, in the sanitary napkin 100 according to the third embodiment of the absorbent article of the present invention, the thickness of the impregnated portion 6b in the portion _R1 ′ overlapping the virtual fold line peripheral portion _R1 in the thickness direction is small. Therefore, it is easy to bend from the virtual fold line as a starting point, and a sharp convex shape can be formed. Therefore, the alignment of the absorbent article can be facilitated. Further, since the impregnated portion 6b in the portion R _{2'overlapping} with the adjacent portion R ₂ has a large thickness, the anchoring effect of the adhesive material 6 is high. Therefore, when the absorbent article is reattached, the adhesive 6 in the aligned portion is less likely to come off. Therefore, it is easy to attach the absorbent article to an appropriate position when attaching it to the clothes.

The difference between the thickness of the portion of the impregnated portion that overlaps with the peripheral portion of the virtual fold line in the thickness direction and the thickness of the portion that overlaps with the adjacent portion shall be given by the same method as described above regarding the thickness of the adhesive portion. Can be done.

In the case of using a method of applying an adhesive substance on a sheet of an absorbent article, bending the absorbent article along a virtual fold line, and pressing a portion along the fold line and an adjacent portion thereof. , The difference in press pressure can give a difference in the depth of impregnation of the adhesive material into the non-woven fabric.

More specifically, the press pressure is not applied to the portion around the virtual fold line, which overlaps with the convex substantially arc portion formed by bending the absorbent article, and the press pressure is applied to the adjacent portion. In the portion around the virtual fold line, the depth of the adhesive material impregnating the non-woven fabric is small, and in the adjacent portion, the depth of the adhesive material impregnating the nonwoven fabric is deep. As a result, in the impregnated portion, the thickness of the peripheral portion of the virtual fold line becomes smaller than the thickness of the adjacent portion.

Of the impregnated part, the thickness of the portion overlapping in the thickness direction with the peripheral portion of the virtual fold line and the thickness of the portion overlapping in the thickness direction with the adjacent portion are the in-plane of the absorbent article in the unfolded state of the absorbent article. Is defined as the average value of the lengths of each portion from the clothing facing surface side of the sheet to the skin facing surface side of the impregnated portion in the cross section in the direction orthogonal to the virtual fold line.

Here, in this cross section, the magnitude relation of the average value of this length can be obtained as the magnitude relation of the area of each portion in the cross section. The magnitude relationship of this area can be obtained visually or by using image analysis software from electron microscope images of these cross sections.

Further, the cross section of the absorbent article can be obtained by cutting the absorbent article soaked in liquid nitrogen and hardened.

<Virtual fold line>
The absorbent article has a virtual fold line for bending the absorbent article so as to overlap with the adhesive in the thickness direction and to be convex on the side facing the clothing in the unfolded state. The virtual fold line is a fold axis when the absorbent article is bent so that the garment contact surface side is convex. The virtual fold line is arranged, for example, at a portion that becomes the apex of the convex shape formed when the absorbent article is bent so that the clothing contact surface side becomes convex.

In the present invention, in the unfolded state of the absorbent article, the virtual fold line can be arranged along the width direction. Here, the fact that the virtual fold line is arranged along the width direction means that the virtual fold line is horizontal in the width direction of the absorbent article, but is within an error range, for example, within a range of ± 1 °. It may be tilted from the width direction within.

In order to properly use the absorbent article, it is desirable to attach the absorbent article to the clothes along the shape of the clothes.

When the absorbent article has a virtual fold line along the width direction, the absorbent article is easily bent along the virtual fold line so that the facing surface side of the garment is convex so as to match the shape of the garment. , The absorbent article can be more properly aligned. That is, it becomes easier to temporarily fix the absorbent article to the clothes.

For example, as shown in FIG. 2, in the _first embodiment of the absorbent article of the present invention, the virtual fold lines L1 to L3 _are arranged along the width direction W.

As described above, in the _first embodiment of the absorbent article of the present invention, the virtual fold lines L1 to L3 _are provided along the width direction. Therefore, in the _first embodiment of the absorbent article of the present invention _, the absorbent article is bent along the virtual folding lines L1 to L3 so that the facing surface side of the clothing is convex so as to match the shape of the clothing. It is easy to make the shape of the absorbent article, and it is easier to temporarily fix it to the clothes.

Further, in the present invention, in the absorbent article, the virtual fold line can be arranged along the direction inclined in the width direction in the unfolded state. Here, the fact that the virtual fold line is arranged along the direction in which the virtual fold line is inclined in the width direction means that the virtual fold line is inclined in the width direction of the absorbent article.

When the absorbent article is temporarily fixed, it may be temporarily fixed several times to correct its position. When the absorbent article is removed from the garment, it is usually removed along the longitudinal direction of the absorbent article.

When the virtual fold line is arranged along the direction of inclination in the width direction, the peripheral portion of the virtual fold line also has a shape along the direction of inclination in the width direction with respect to the absorbent article. Then, in the absorbent article, when the portion around the virtual fold line, which is a particularly adhesive portion of the adhesive article, is inclined in the width direction of the absorbent article, the portion is arranged along the width direction. Compared to the case where the bandage is used, the length of the portion is shorter in the width direction. Therefore, when the absorbent article is peeled off from the clothes, the absorbent article can be peeled off from the clothes with a smaller force.

For example, as shown in FIG. 6, in the sanitary napkin 100 according to the _fourth embodiment of the absorbent article of the present invention, the virtual fold lines L4 to _L5 are arranged along the direction inclined in the width direction W. ing.

As described above, in the sanitary napkin 100 according to the fourth embodiment of the absorbent article of the present invention, the portion around the virtual fold line, which is a particularly highly adhesive portion of the adhesive material, is in the width direction of the absorbent article. It is tilted. Therefore, the length of the portion is shorter in the width direction as compared with the case where the portion is arranged along the width direction. Therefore, when the absorbent article is peeled off from the clothes, the absorbent article can be peeled off from the clothes with a smaller force.

The degree of inclination of the virtual fold line is not particularly limited. The angle of inclination may be greater than 1 ° and less than 45 ° in the width direction. When the angle of inclination is less than 45 °, the temporarily fixed portion of the absorbent article is longer in the width direction than in the longitudinal direction of the absorbent article, so that temporary fixing is easier.

The angle of inclination may be more than 1 °, 5 ° or more, 10 ° or more, or 15 ° or more, and may be less than 45 °, 40 ° or less, 30 ° or less, or 20 ° or less.

In the present invention, in the unfolded state of the absorbent article, the virtual fold line can be arranged in each of the front region and the posterior region of the absorbent article.

When aligning the absorbent article, it is especially important to align the anterior and posterior regions of the absorbent article to the proper position.

When the absorbent article has a structure in which virtual fold lines are arranged in the front region and the rear region, respectively, the absorbent article can be aligned with the front region and the rear region as starting points. Therefore, the absorbent article can be more properly aligned.

For example, as shown in FIG. 3A, the menstrual napkin 100 according to the first embodiment of the absorbent article of the present invention has an anterior region F, a cloaca contact region E, and a posterior region B. Further, the virtual fold line L ₁ is arranged in the front side area F, and the virtual fold lines L ₂ and L ₃ are arranged in the rear side area B, respectively. Then, these virtual fold lines L ₁ to L ₃ overlap with the adhesive material 6 in the thickness direction.

As described above, the sanitary napkin 100 according to the first embodiment of the absorbent article of the present invention has a structure in which virtual fold lines are arranged in each of the anterior region F and the posterior region B. Therefore, the convex portion formed by bending the absorbent article along the virtual fold lines arranged in the front side region F and the rear side region B can be positioned as a starting point. Therefore, the absorbent article can be more properly aligned.

Further, in the unfolded state of the absorbent article, the virtual fold line can be arranged in each of the front side region, the excretion opening contact area, and the rear side region.

When aligning the absorbent article, it is especially important to align the cloaca contact area of the absorbent article to an appropriate position.

When the absorbent article has a structure in which a virtual fold line is arranged in the excretion opening contact area, the position can be aligned with the excretion port contact area as a starting point.

For example, as shown in FIG. 7, in the sanitary napkin 100 according to the fifth embodiment of the absorbent article of the present invention, the virtual fold lines L ₁ , L ₂ and L ₃ are the anterior region F and the excretion mouthpiece, respectively. It is arranged in the tangent area E and the posterior area B. Then, these virtual fold lines overlap with the adhesive material 6 in the thickness direction.

As described above, the sanitary napkin 100 according to the fifth embodiment of the absorbent article of the present invention has a structure in which a virtual fold line is arranged in the excretion opening contact region. Therefore, the alignment can be performed with the excretion port contact area as the starting point. Therefore, the absorbent article can be more properly aligned.

The absorbent article to which the present invention is applied is not limited to the menstrual napkins of each of the above-described embodiments, and can be applied to all absorbent articles used by being attached to clothing, for example, a light incontinence pad. , Panty liner and other absorbent articles. Further, as for each sheet constituting the absorbent article, in addition to the above-mentioned front surface sheet, back sheet and the like, various sheets are assumed depending on the type of the absorbent article to be applied and the like. As such a sheet, for example, a liquid permeable diffusion which is arranged between the front surface sheet and the absorber or between the absorber and the back surface sheet and diffuses the excrement liquid such as urine in the longitudinal direction or the width direction. Sheets and the like can be mentioned.

100 Menstrual napkin 1 Front sheet 2 Absorber 3 Side sheet 4 Groove 5 Back sheet 6 Adhesive L ₁ to L ₃ Virtual fold line

Claims (7)

An absorbent article containing a sheet arranged on the facing surface side of clothing and an adhesive for fixing clothing arranged on the surface facing the facing surface of clothing.
The absorbent article has a virtual fold line for bending the absorbent article so as to overlap the adhesive material in the thickness direction and to be convex on the side facing the clothing in the unfolded state.
The adhesive material has an adhesive portion existing on the surface of the sheet on the clothing facing surface side.
The adhesive portion has a portion around the virtual fold line and an adjacent portion adjacent to the portion around the virtual fold line.
The portion around the virtual fold line is 1 from the virtual fold line in a direction orthogonal to the virtual fold line in the plane of the absorbent article, where d is the average thickness of the absorbent article in the unfolded state. It is a portion within the length range of / 2πd, and the thickness of the peripheral portion of the virtual fold line is larger than the thickness of the adjacent portion.
Absorbent article. The sheet is a non-woven fabric and is
The adhesive material has an impregnated portion that is continuous with the adhesive portion and impregnates the nonwoven fabric.
The absorbent article according to claim 1. In the expanded state, the thickness of the portion overlapping the virtual fold line peripheral portion in the thickness direction of the impregnated portion is smaller than the thickness of the portion overlapping the adjacent portion.
The absorbent article according to claim 2. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article has an absorber that overlaps the virtual fold line in the thickness direction in the unfolded state. The absorbent article has a longitudinal direction and a width direction in the unfolded state, and the virtual fold line is arranged along the width direction.
The absorbent article according to any one of claims 1 to 4. The absorbent article has a longitudinal direction and a width direction in the deployed state, and the virtual fold line is arranged along a direction inclined in the width direction.
The absorbent article according to any one of claims 1 to 4. The absorbent article has an anterior region, an excretion opening contact region, and a posterior region in the longitudinal direction in the deployed state, and the virtual fold line is the anterior region and the posterior region. Located in each of the
The absorbent article according to claim 5 or 6.

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