JP7110940B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorbent article in which sheet elements are adhered with a hot-melt adhesive.

Disposable diapers, urine pads, and the like are known as absorbent articles. Among absorbent articles, a disposable diaper includes a front body, a back body, and an absorbent main body connecting the front body and the back body. Disposable diapers are composed of a liquid-impermeable backsheet, a liquid-permeable topsheet, and an absorbent body disposed between the topsheet and the backsheet. When worn, the absorbent core retains liquid such as urine, which is excrement, through the top sheet, and the back sheet prevents the liquid from leaking out of the absorbent article. In the absorbent main body, hot-melt adhesive is used to fix between the absorbent body and the top sheet and between the absorbent body and the back sheet.

In addition, waist gathers are formed on the front body and the back body. The waist gather is constructed by sandwiching a thread-like elastic member between two sheet elements. Here, the two sheet elements and the elastic members for the sheet elements are also fixed with a hot-melt adhesive (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2018-23760

An object of the present invention is to provide an absorbent article capable of improving breathability.

An absorbent article for solving the above problems comprises an absorbent body, a top sheet located on the skin side of the absorbent body, and a back sheet located on the opposite side of the absorbent body to the skin. , the absorbent body and the top sheet are provided with a bonded portion to which a bubble-containing hot-melt adhesive is applied and bonded, and a non-bonded portion to which the hot-melt adhesive is not applied.

According to the above configuration, since the hot-melt adhesive contains air bubbles, it becomes bulky and the gap between the absorbent core and the top sheet can be increased. Thereby, the air permeability between the absorbent body and the top sheet can be improved.

An absorbent article for solving the above problems comprises an absorbent body, a top sheet located on the skin side of the absorbent body, and a back sheet located on the opposite side of the absorbent body to the skin. , between the absorbent body and the backsheet, there is provided a bonded portion to which a bubble-containing hot-melt adhesive is applied and bonded, and a non-bonded portion to which the hot-melt adhesive is not applied.

According to the above configuration, by using the hot melt adhesive, the absorbent body and the backsheet are not in contact with each other. Thereby, the air permeability between the absorbent body and the backsheet can be improved.

An absorbent article for solving the above problems includes waist gathers in at least one of a front body that covers the abdomen of a wearer and a back body that covers the back of the wearer, and the waist gathers include at least two sheets. A sheet element is provided, and the two sheet elements have a bonded portion bonded with a hot-melt adhesive containing air bubbles and a non-bonded portion not coated with the hot-melt adhesive.

According to the above configuration, the concave and convex portions extending in the vertical direction and spaced apart from each other in the waist circumference direction are provided between the mutually adjacent bonding portions made of the hot-melt adhesive containing air bubbles. Since the hot-melt adhesive is bulky, the gaps between the uneven portions are increased, and the breathability around the waist can be improved.

In the absorbent article, the hot-melt adhesive has a bubble content of 20% or more and 50% or less by volume, and a coating amount of 1.5 g/m ² or more and 10 g/m ² or less. , rubber-based or olefin-based.

According to the above configuration, the volume ratio of the air bubbles is set to 20% or more and 50% or less, thereby suppressing a decrease in the adhesive force and increasing the bulkiness. In addition, by setting the coating amount of the hot-melt adhesive to 1.5 g/m ² or more, the absorbent body and the top sheet can be adhered to the extent that there is no problem in use, and the absorbent body can be and the top sheet can be made non-contact. Also, by setting the coating amount of the hot-melt adhesive to 10 g/m ² or less, it is possible to prevent the area of the adhesive portion to which the hot-melt adhesive is applied from becoming too large, thereby preventing the air permeability from deteriorating. Further, by using a rubber-based or olefin-based hot-melt adhesive, a highly versatile hot-melt adhesive can be used.

In the absorbent article described above, it is preferable that the non-bonded portions between the bonded portions constitute air passages.
According to the above configuration, by using the hot-melt adhesive, the ventilation path is formed, and the ventilation can be improved.

ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which made it possible to improve breathability can be provided.

1 is a perspective view of an underpants-type disposable diaper embodying the absorbent article of the present invention; FIG. 1 is an exploded perspective view of an underpants-type disposable diaper embodying an absorbent article of the present invention; FIG. Sectional drawing of an absorbent main body. FIG. 2 is a plan view showing the application pattern (omega-like) of the hot-melt adhesive between the absorbent body and the top sheet and back sheet. (a) is an exploded perspective view of the waist portion, (b) is a cross-sectional view of the elastic member in the stretched state in the waist portion, and (c) is a cross-sectional view of the elastic member in the contracted state in the waist portion. FIG. 10 is a cross-sectional view of a modified example of the waist portion, showing a state in which the elastic member in the waist portion is contracted. FIG. 7 is a cross-sectional view showing a state in which elastic members are stretched in the waist portion shown in FIG. 6 ; FIG. 2 shows the application pattern of the hot melt adhesive between the absorbent body and the top sheet and the back sheet, (a) is a striped application pattern, and (b) is a spiral application pattern. , (c) shows a random application pattern; FIG. 10 is a plan view showing a modification in which a hot-melt adhesive containing air bubbles is applied to the outer peripheral portion of the absorbent body to provide a wall portion; (a) is a plan view showing a modification of the absorbent main body in which a concave grid pattern is provided on the skin contact surface of the absorbent main body, and (b) is a cross-sectional view of the main part thereof. FIG. 11 is a plan view showing a modified example in which a bubble-containing hot-melt adhesive is applied so as to surround a portion that contacts the anus. FIG. 5 is a cross-sectional view showing a modification in which a hot-melt adhesive containing air bubbles is applied along the outer peripheral edge of the absorbent body. FIG. 2 is a diagram showing the configuration of an apparatus for applying a hot-melt adhesive containing air bubbles to the outer peripheral edge of an absorbent body;

An underpants-type disposable diaper in one embodiment embodying the absorbent article of the present invention will be described with reference to FIGS. 1 to 13. FIG.
As shown in FIG. 1, an underpants-type disposable diaper 10 (hereinafter simply referred to as "diaper 10") includes a front body 10F having a shape that follows the shape of the abdomen of the wearer and a shape that follows the shape of the back of the wearer. and a crotch portion 10C connecting the front body 10F and the back body 10R.

In the front body 10F and the back body 10R, the side opposite to the crotch part 10C constitutes a waist part 10W that surrounds the wearer's waist part, and has a waist opening 10A at the upper end. In addition, the left and right ends of the front body 10F, the left and right ends of the back body 10R, and the left and right ends of the crotch part 10C refer to a pair of left and right leg openings 10L having a shape surrounding the wearer's thighs. Configure. Joint portions 11 are formed at both left and right end portions of the front body 10F and the back body 10R in the horizontal direction, which is the waist circumference direction.

FIG. 2 is an exploded perspective view of the pants-type disposable diaper. The front body 10F is composed of a first outer body 12F, and the back body 10R is composed of a second outer body 12R. Hereinafter, the first exterior body 12</b>F and the second exterior body 12</b>R are also collectively referred to as the exterior body 12 .

The exterior body 12 has a shape whose longitudinal direction is the lateral direction, and is configured by sandwiching an elastic member 15 between exterior sheets 21 folded in two. The exterior body 12 includes a cushion sheet element 22 that is superimposed on the inner sheet element 21A positioned inside the exterior sheet 21 that is folded in half. The exterior body 12 has a waist gather formed by the exterior sheet 21 , the elastic member 15 and the cushion sheet element 22 . Exterior sheet 21 and cushion sheet element 22 are, for example, non-woven fabrics made of synthetic fibers made from polyethylene, polypropylene, polyester, or other thermoplastic resins, and are composed of liquid-permeable sheets and liquid-impermeable sheets. It is The elastic member 15 is an elastic body or elastic member made of one or more materials selected from natural rubber, synthetic rubber, urethane, etc., and is formed in a thread-like, cord-like, net-like, or flat shape. A plurality of elastic members 15 are arranged parallel to each other along the horizontal direction.

The first outer body 12F and the second outer body 12R are connected by an absorbent main body 16 that constitutes the crotch part 10C. The absorbent main body 16 is formed in a rectangular shape whose longitudinal direction is the vertical direction. The absorbent main body 16 includes a liquid-impermeable back sheet 17 , an absorbent body 18 , and a liquid-permeable top sheet 19 . In the diaper 10, the top sheet 19 is arranged on the inner side in contact with the wearer's skin, and the back sheet 17 is arranged on the outer side. Furthermore, a cover sheet 17A made of non-woven fabric is arranged on the outside of the back sheet 17 in order to improve the feeling of touch.

The material forming the back sheet 17 is, for example, a liquid-impermeable polyethylene resin film. The back sheet 17 is formed with a large number of fine holes in order to ensure breathability. The material forming the top sheet 19 is, for example, one or more materials selected from woven fabrics, non-woven fabrics, porous films, and the like. For the top sheet 19, for example, a liquid-permeable nonwoven fabric made of fibers of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon that have been subjected to a hydrophilic treatment is used. .

The absorber 18 has a band shape so as to straddle the front body 10F, the crotch part 10C, and the back body 10R. The material forming the absorbent body 18 is, for example, an absorbent material such as fluff pulp, a superabsorbent polymer (SAP: Superabsorbent polymer), or a hydrophilic sheet. As an example, the absorbent body 18 is wrapped with a core wrap 18A made of a hydrophilic sheet and placed between the back sheet 17 and the top sheet 19 . As shown in FIG. 3, a top sheet 19 and a back sheet 17 are joined with a hot-melt adhesive 20 to the absorbent body 18 wrapped in the core wrap 18A.

The hot melt adhesive 20 contains air bubbles. Such a hot-melt adhesive 20 contains more air bubbles than ordinary hot-melt adhesives, and is configured to contain more air bubbles than the air bubbles that are naturally contained during application. It is For example, such a hot melt adhesive 20 is, for example, a foaming hot melt adhesive. A foamable hot melt adhesive is an adhesive that contains a foam cell former that foams when heated to a molten state. Moreover, the hot-melt adhesive 20 is preferably polyolefin-based or rubber-based.

As shown in FIG. 4, such a hot melt adhesive 20 is bulky because it contains air bubbles. Therefore, in the non-bonded portion 20B other than the bonded portion 20A, which is the region where the hot-melt adhesive 20 is applied, the gap in the thickness direction between the absorbent body 18 and the top sheet 19 is increased, so that no contact is achieved. can be done. As an example, in the hot-melt adhesive 20, the content of air bubbles is preferably 20% or more by volume. As a result, the bulk of the hot melt adhesive 20 can be increased while suppressing a decrease in adhesive force. Also, the content of air bubbles is preferably 50% or less in terms of volume ratio. This is because if the content of air bubbles exceeds 50% by volume, too many air bubbles are contained, and the adhesive force for adhering the absorbent body 18 and the top sheet 19 is excessively lowered.

Also, the coating amount of the hot-melt adhesive 20 is preferably 1.5 g/m ² or more. Thereby, the absorber 18 and the top sheet 19 can be adhered to the extent that the use of the diaper 10 is not affected. Furthermore, the coating amount is preferably 5 g/m ² or more. As a result, the gap between the absorbent body 18 and the top sheet 19 in the non-adhesive portion 20B can be set to the extent that the absorbent body 18 and the top sheet 19 can be kept in non-contact with each other. Also, the coating amount of the hot-melt adhesive 20 is preferably 10 g/m ² or less. As a result, it is possible to suppress deterioration in air permeability due to an excessively large area of the adhesive portion 20A to which the hot-melt adhesive 20 is applied.

The application pattern of the hot melt adhesive 20 is preferably a pattern that does not have overlapping application portions where the hot melt adhesive 20 is applied in an overlapping manner. An example of an application pattern that does not have an overlapping application portion is a pattern in which a wave-shaped or omega-shaped pattern extends in the vertical direction (FIG. 4 shows an omega-shaped pattern that extends in the vertical direction). The hot-melt adhesive 20 is bulky because it contains air bubbles, but by not having an overlapping application part, the gap in the thickness direction in the gap between the absorbent body 18 and the top sheet 19 can be made constant. can be done. In other words, the surface of the top sheet 19 becomes flat and can be less irritating to the skin.

The method of applying the hot-melt adhesive to the absorbent body 18 or the top sheet 19 is preferably a non-contact method in which the molten hot-melt adhesive 20 is discharged from a nozzle rather than a contact method using a roll. This is because, in the case of the contact type, air bubbles contained in the hot-melt adhesive 20 may be removed due to the pressure contact of the rolls.

As described above, the hot-melt adhesive 20 containing air bubbles is used for bonding between the absorbent body 18 and the top sheet 19 . Therefore, a void is formed in the non-bonded portion 20B. Thereby, breathability can be improved. In addition, if the height of the absorbent body 18 and the top sheet 19 achieved by using the hot-melt adhesive 20 containing air bubbles is to be achieved by using a conventional hot-melt adhesive that does not contain air bubbles, the use As for the amount, the use of a conventional hot-melt adhesive that does not contain air bubbles is greater because it does not contain air bubbles and does not become bulky. In this respect, the amount of hot-melt adhesive used can be reduced.

The bubble-containing hot-melt adhesive 20 configured as described above is also used for adhesion between the back sheet 17 and the absorbent body 18 . Also in this case, the content of air bubbles is preferably 20% or more by volume for the same reason as in the case of the top sheet 19, and the content of air bubbles is 50% by volume. The following are preferable. Further, the coating amount is also preferably 1.5 g/m ² or more, more preferably 5 g/m ² or more for the same reason as in the case of the top sheet 19 . Also, it is preferably 10 g/m ² or less. When the hot-melt adhesive 20 is used between the backsheet 17 and the absorbent body 18, a gap is formed between the backsheet 17 and the absorbent body 18 as well. As a result, the liquid exuding from the absorbent body 18 to the back sheet 17 side spreads between the back sheet 17 and the absorbent body 18 and is absorbed by the absorbent body 18 . Therefore, it is possible to prevent the liquid from flowing back to the top sheet 19 side. Moreover, the gap between the back sheet 17 and the absorbent body 18 can also contribute to the improvement of air permeability.

The outer surface of the absorbent main body 16 configured as described above, which overlaps with the exterior body 12 in the vertical direction, serves as a portion to be adhered to the exterior body 12 .
Three-dimensional gathers 14 are arranged on both ends of the absorbent main body 16 along the vertical direction. The three-dimensional gathers 14 are configured by arranging side sheets 14S on both ends along the vertical direction of the top sheet 19 and by arranging first elastic members 14E on the side sheets 14S along the vertical direction. When the first elastic member 14E is contracted, the side sheet 14S of the three-dimensional gathers 14 rises toward the wearer's skin contact direction and is positioned around the leg openings 10L.

Further, the side edges of the absorbent main body 16 are provided with leg gathers 13 . The leg gathers 13 are constructed by folding back the cover sheet 17A and sandwiching and fixing the second elastic members 13E.

The waist portion 10W sandwiches the elastic member 15 between the inner sheet element 21A and the outer sheet element 21B of the outer sheet 21 to constitute the seat structure 23A. Elements 22 are superimposed. As a result, the waist portion 10W is provided with a flute portion to form a waist gather. The cushion sheet element 22 is a sheet element that contacts the wearer's skin and is a sheet element that does not have an uneven structure.

Between the inner sheet element 21A and the outer sheet element 21B of the outer sheet 21, an elastic member 15 is sandwiched and fixed in a stretched state. The elastic member 15 is fixed by applying an adhesive to the elastic member itself and sandwiching the adhesive-applied elastic member between sheets. Also, as an example, after applying an adhesive to one or both of the sheets sandwiching the elastic member, the stretched elastic member is sandwiched and fixed between these sheets.

As shown in FIGS. 5(a) and 5(b), in order to overlap the cushion sheet element 22 on the seat structure 23A with the elastic member 15 in a stretched state, a hot melt adhesive is applied to the cushion sheet element 22 or the inner sheet element 21A. 20 is provided with adhesive portions 24A extending vertically and spaced apart from each other in the horizontal direction. As an example, the adhesive portions 24A are provided at regular intervals in the horizontal direction. After that, the stretched state of the elastic member 15 is released. Note that this bonding in the vertical direction may be intermittent (in the form of a dotted line).

As shown in FIG. 5(c), since the elastic member 15 is fixed to the inner sheet element 21A and the outer sheet element 21B, contraction of the elastic member 15 causes the gap between the adjoining adhesive portions 24A. , and flute portions are provided with concave and convex portions 25 extending vertically and spaced apart from each other in the horizontal direction. As a result, air such as moisture passes through the gaps 24 of the uneven portion 25 and is discharged in the direction of the waist opening 10A.

The action of the diaper 10 as described above will be described. When the diaper 10 is worn, the hot-melt adhesive 20 containing air bubbles is interposed between the absorbent body 18 and the top sheet 19 to form voids in the non-adhesive portions, and the voids serve as air passages. Function. In addition, since the hot-melt adhesive 20 containing air bubbles is also interposed between the absorbent body 18 and the back sheet 17 , voids are formed in the non-adhered portions, and the voids serve as air passages. The liquid exuding to the back sheet 17 side spreads between the back sheet 17 and the absorbent body 18 and is absorbed by the absorbent body 18 . Furthermore, in the waist portion 10W as well, the hot-melt adhesive 20 containing air bubbles increases the air gaps of the waist gathers. In this way, the diaper 10 uses the hot-melt adhesive 20 between the absorbent body 18 and the top sheet 19, between the absorbent body 18 and the back sheet 17, and in the waist gathers. Ventilation is greatly improved.

As described above, according to the above embodiment, the following effects can be obtained.
(1) Since the hot-melt adhesive 20 contains air bubbles, it becomes bulky, and the gap between the absorbent body 18 and the top sheet 19 becomes large, and non-contact can be achieved. Thereby, air permeability between the absorbent body 18 and the top sheet 19 can be improved.

(2) In the hot-melt adhesive 20, the content of air bubbles is preferably 20% or more by volume. Thereby, it is possible to increase the bulk while suppressing the deterioration of the adhesive force.
(3) By using the hot-melt adhesive 20 between the absorbent body 18 and the top sheet 19, the absorbent body 18 and the top sheet 19 can be kept in non-contact at the non-bonded portion 20B. Thereby, a ventilation path between the absorbent body 18 and the top sheet 19 can be secured in the non-bonded portion 20B.

(4) The application pattern of the hot-melt adhesive 20 is a pattern that does not have overlapping application portions of the hot-melt adhesive 20 . Therefore, the gap between the absorbent body 18 and the top sheet 19 can be made constant. As a result, the surface of the top sheet 19 is flattened and the texture is improved.

(5) The coating amount of the hot-melt adhesive 20 is set to 1.5 g/m ² or more, so that the absorber 18 and the top sheet 19 can be adhered to the extent that there is no problem in use, and The absorbent body 18 and the top sheet 19 can be made non-contact at the bonding portion 20B. In addition, by setting the coating amount of the hot-melt adhesive 20 to 10 g/m ² or less, it is possible to prevent the area of the adhesive portion 20A to which the hot-melt adhesive 20 is applied from becoming too wide, thereby suppressing deterioration in air permeability. be able to.

(6) The hot-melt adhesive 20 can be a rubber-based or olefin-based hot-melt adhesive with high versatility.
(7) The hot-melt adhesive 20 is also used for adhesion between the backsheet 17 and the absorbent body 18 . Thereby, a gap is formed between the back sheet 17 and the absorbent body 18 . Therefore, the liquid exuded from the absorbent body 18 to the back sheet 17 side spreads between the back sheet 17 and the absorbent body 18, is absorbed by the absorbent body 18, and prevents the liquid from returning to the top sheet 19 side. can be done.

(8) Since the elastic member 15 is fixed to the inner sheet element 21A and the outer sheet element 21B, contraction of the elastic member 15 causes the adjacent adhesive portions 24A to extend vertically and laterally. Concavo-convex portions 25 are provided spaced apart from each other in the direction. By using the hot-melt adhesive 20 also for the waist gathers, since the hot-melt adhesive 20 is bulky, the gaps 24 between the uneven portions 25 which are non-bonded portions are increased to improve air permeability in the waist portion 10W. can be made

It should be noted that the above-described embodiment can be modified as appropriate and implemented as follows.
- Figures 6 and 7 are variations of the waist gathers. The waist portion 10W is constructed by sandwiching the elastic member 15 between the inner sheet element 21A and the outer sheet element 21B of the outer sheet 21. As shown in FIG. The seat structure 23A configured in this manner is provided with a flute portion by stacking the cushion seat elements 26 . As shown in FIG. 7 , the cushion sheet element 26 has concave portions and convex portions extending in the vertical direction of the diaper 10 , and the concave portions and convex portions extend along the horizontal direction perpendicular to the vertical direction of the diaper 10 . Concavo-convex portions 27 arranged alternately are provided in advance. The convex portion 28 protruding toward the inner sheet element 21A abuts against the inner sheet element 21A, and the abutted portion becomes the adhesive portion 24A. The inner sheet element 21A and the convex portion 28 are adhered to form a continuous straight line along the top portion of the convex portion 28 in the vertical direction. The hot-melt adhesive 20 is used to bond the protrusions 28 and the inner sheet elements 21A. Note that this bonding in the vertical direction may be intermittent bonding.

In order to overlap the cushion seat element 26 having the concave and convex portions 25 in advance on the seat structure 23A with the elastic member 15 in the stretched state, the adhesive portion 24A is provided on the convex portion 28 of the cushion seat element 26 or the inner sheet element 21A. After that, the stretched state of the elastic member 15 is released. Then, the elastic member 15 fixed in a stretched state between the inner sheet element 21A and the outer sheet element 21B of the outer sheet 21 is contracted, so that the uneven portion 27 becomes narrow and tall. In addition, the inner sheet element 21A and the outer sheet element 21B also have a slightly wavy shape. Since the cushion sheet element 26 is provided with the concave-convex portion 27 in advance, regardless of the size of the wearer's waist circumference, that is, regardless of the degree of expansion and contraction of the elastic member 15, there will be a gap between the inner sheet element 21A and the cushion sheet element 26. , a linear gap 24 is provided along the vertical direction of the diaper 10 . Air containing moisture or the like is discharged through the gap 24 in the direction of the waist opening 10A.

Thus, in the waist portion 10W, the elastic member 15 in a stretched state is fixed between the inner sheet element 21A and the outer sheet element 21B in a stretched state, and the cushion sheet element 26 has the concave and convex portions 27 in advance. Therefore, even if the elastic member 15 is stretched to the maximum, it is possible to prevent the uneven portion 27 from stretching and losing the unevenness. Therefore, even when the diaper 10 is worn by a wearer whose waist circumference is larger than the reference waist circumference, the unevenness of the uneven portion 27 is maintained, and the disappearance of the gap 24 can be suppressed. As a result, the diaper 10 can ensure breathability through the gap 24 regardless of the waist circumference of the wearer, maintain cushioning properties, and improve fit in the waist portion 10W. can. By using the hot-melt adhesive 20 also in the waist gathers in this way, since the hot-melt adhesive 20 is bulky, the gaps 24 of the uneven portions 27, which are non-adhesive portions, become large, and the waist gathers 10W have a large gap 24. Breathability can be improved.

- As another modification of the waist gathers, the cushion sheet elements 22 and 26 may be omitted. In this case, the elastic member 15 is simply sandwiched between the folded exterior sheets 21 (the inner sheet element 21A and the outer sheet element 21B). The inner sheet element 21A and the outer sheet element 21B are formed, for example, in a pattern extending in the vertical direction and spaced apart in the horizontal direction (eg, omega shape (see FIG. 4), stripe shape (see FIG. 8A), spiral shape). The hot-melt adhesive 20 is applied in the shape (see FIG. 8(b))). Thus, the bulky hot-melt adhesive 20 can provide a gap serving as an air passage in the non-bonded portion where the hot-melt adhesive is not applied.

- The number of sheets to be stacked to form the waist gather is not particularly limited as long as it is two or more.
- It is sufficient that the waist gathers are provided at the best time of at least one of the front body and the back body.

・The application pattern of the hot-melt adhesive 20 between the absorbent body 18 and the top sheet 19 and the application pattern of the hot-melt adhesive 20 between the back sheet 17 and the absorbent body 18 are limited to the example of FIG. Alternatively, as shown in FIG. 8A, the application pattern of the hot melt adhesive 20 may be striped. In this case, the adhesive portions coated with the hot-melt adhesive 20 are evenly spaced. Note that the stripes do not have to be evenly spaced. Moreover, as shown in FIG. 8(b), it may have a spiral shape having an overlapping application portion 41 in which the hot melt adhesive is applied in an overlapping manner. The overlapping coating portion 41 is higher than the non-overlapping coating portion 41 . Therefore, gaps are more likely to be formed between the sheets. Alternatively, the application pattern having the overlapping application portions 41 may be a lattice pattern in which each lattice has a rectangular shape or a rhombic shape. Furthermore, as shown in FIG. 8(c), the hot-melt adhesive 20 may be applied in a random pattern. In the case of a random pattern, it may or may not have the overlapping application portion 41 .

The application pattern of the hot-melt adhesive 20 between the absorbent body 18 and the top sheet 19 and the application pattern of the hot-melt adhesive 20 between the back sheet 17 and the absorbent body 18 are continuous solid lines. It may be in the form of an intermittent dotted line. In the case of dotted lines, the application amount of the hot-melt adhesive 20 can be reduced. In addition, gaps adjacent to each other are connected to each other, and further improvement in air permeability can be realized. The solid line or dotted line application pattern may have the same thickness, or may have different thickness depending on the location.

- The application pattern as shown in Fig. 4 and Figs. 8(a) and (b) may extend in the vertical direction of the diaper 10 or may extend in the horizontal direction. Moreover, it may extend obliquely with respect to the vertical direction or the horizontal direction. Such a coating pattern can be applied between the absorbent body 18 and the top sheet 19, between the back sheet 17 and the absorbent body 18, and in the waist gathers.

- The bonding portion 24A of the waist gather may be linear or band-shaped with a predetermined width. Also, the gaps 24 may have the same width, or alternately different widths.

- The adhesive structure using the hot-melt adhesive 20 may be employed in at least one of between the absorbent body 18 and the top sheet 19, between the back sheet 17 and the absorbent body 18, and the waist gathers. . This makes it possible to achieve an improvement in the adopted partial breathability. In places where the adhesion structure using the hot-melt adhesive 20 is not adopted, heat sealing or ultrasonic sealing may be used for adhesion.

- The absorbent body 18 does not have to be wrapped in the core wrap 18A.
- The diaper 10 may have only the leg gathers 13 without the three-dimensional gathers 14 .

- As shown in FIG. 9, the absorbent main body 16 may have a hot-melt adhesive 20 applied to the outer peripheral portion of the top sheet 19 . Specifically, a hot-melt adhesive 20 is used for adhesion to the top sheet 19 at the outer periphery of the absorbent body 18 . The hot melt adhesive 20 is bulky because it contains air bubbles, and can form a wall portion 31 on the outer peripheral portion of the absorbent body 18 between the absorbent body 18 and the top sheet 19 . . The wall portion 31 is made of the hot-melt adhesive 20 to be water-repellent. Therefore, the wall portion 31 can prevent liquid such as excrement from leaking from the top sheet 19 to the outside of the absorbent body 18 . In particular, it is possible to prevent solids (such as loose stools) in excrement from leaking out of the absorber 18 . Then, the liquid can be absorbed by the absorbent body 18 .

In this case, it is preferable to use a conventional bubble-free hot-melt adhesive for the inside of the wall portion 31 of the absorber 18 . Conventional bubble-free hot melt adhesives are applied in the patterns of FIGS. Thereby, a storage portion for solids (loose stools, etc.) can be formed between the surface of the absorbent body 18 and the top sheet 19 due to the height difference. Of course, the hot-melt adhesive 20 may also be used on the inner side of the wall portion 31 of the absorbent body 18. The storage portion may be configured inside the wall portion 31 by making the storage portion smaller than the portion.

Furthermore, a hot-melt adhesive 20 may be applied to a position corresponding to the outer peripheral portion of the absorbent body 18 on the side of the skin-contacting surface of the top sheet 19 to provide a wall portion. Such a configuration can also prevent excrement from leaking to the area outside the absorbent core 18 on the surface of the top sheet 19 .

- As shown in FIGS. 10(a) and 10(b), the skin-contacting surface of the top sheet 19 is provided with recesses 32 in a grid pattern. The recesses 32 are formed by pressing and squeezing the top sheet 19 together with the absorbent body 18 in the thickness direction. In the absorbent body 18, the density of the absorbent material is higher in the concave portion 32 than in other portions. In the concave portion 32 , the top sheet 19 is integrated with the absorbent body 18 so as to bite into the absorbent body 18 . Such a concave portion 32 serves as a channel for diffusing the liquid along the skin-contacting surface. In addition, the recesses 32 serve as air passages that enhance the air permeability in the space between the wearer and the top sheet 19 .

By the way, the protrusions 33 of the absorbent body 18 surrounded by the recesses 32 of the lattice pattern are adhered to the top sheet 19 with the hot-melt adhesive 20 . The hot-melt adhesive 20 may be a stripe-shaped pattern or a spiral-shaped random pattern (see FIG. 4) for bonding the protrusions 33 and the top sheet 19 to each other. 8), and may be solid.

The concave portions 32 swell when the absorbent body 18 absorbs liquid, so that the concave portions 32 are crushed and gradually become shallower. Even when the absorbent body 18 has absorbed the liquid, the projections 33 are adhered to the top sheet 19 with the bulky hot-melt adhesive 20 containing air bubbles. Therefore, a space corresponding to the hot-melt adhesive 20 is secured between the absorbent body 18 and the top sheet 19 at the position of the recessed portion 32 even if the recessed portion 32 is crushed. Therefore, even when the absorbent body 18 absorbs the liquid and the recesses 32 are crushed, the liquid can be diffused on the absorbent body 18 and air permeability can be ensured. Also, the hot melt adhesive 20 is water repellent. Therefore, it is possible to suppress backflow of the liquid from the portion of the convex portion 33 .

- As shown in Fig. 11, a hot-melt adhesive 20 may be applied so as to surround the absorbent body 18 and the top sheet 19, which are in contact with the anus when worn. Here, the hot-melt adhesive 20 is applied so as to have a dot shape, and the dot shape is made larger at a position closer to the position 34 corresponding to the anus, and the dot shape becomes smaller as it moves away in the front-rear direction. The hot-melt adhesive 20 forms a wall portion 36 protruding from the surface of the absorbent body 18, and inside the wall portion 36, a region surrounding a position 34 corresponding to the anus constitutes a storage portion for solids (such as loose feces). be done.

At a position close to the position 34 corresponding to the anus, the dot shape is large, making it difficult for solids (such as loose stools) to spread, so that excrement can be absorbed by the absorber 18 . Further, the dot shape becomes smaller at a location distant from the position 34 corresponding to the anus where the amount of excrement has decreased. In addition, since the leg gathers 13 and the three-dimensional gathers 14 stand up on both the left and right sides of the position close to the position 34 corresponding to the anus, it is difficult to leak sideways. formed. The wall portion 36 may have an annular shape surrounding the position 34 corresponding to the anus.

・As shown in FIG. 12, the absorbent main body 16 is between the top sheet 19 and the back sheet 17, and the hot melt adhesive 20 is applied to the position along the outer peripheral edge of the absorbent body 18. may At this time, the hot-melt adhesive 20 is applied so as to overlap the outer peripheral edge of the absorbent body 18 as well. As a result, it is possible to prevent the liquid from seeping outward from the edge of the absorbent body 18 .

In order to apply the hot-melt adhesive 20 to the outer peripheral portion of the absorbent body 18, the following device is used. The apparatus includes, for example, a first transport roller 37 as a first transport mechanism for transporting the cover sheet 17A, the absorbent body 18, etc., a second transport roller 38 as a second transport mechanism for transporting the top sheet 19, and a top sheet and a supply mechanism 40 for supplying hot melt adhesive 20 to 19 .

The first conveying roller 37 of the first conveying mechanism is a part of a conveyor or the like, and the back sheet 17 is adhered to the cover sheet 17A, and the absorber 18 is placed thereon. and transport it. The supply mechanism 40 applies the hot-melt adhesive 20 to the back surface of the top sheet 19 at a position corresponding to the outer peripheral portion of the absorbent body 18 . Then, the second conveying rollers 38 of the second conveying mechanism convey the top sheet 19 toward the adhered position with the absorbent body 18 , the cover sheet 17</b>A and the back sheet 17 . At the bonding position, a top sheet 19 coated with a hot-melt adhesive 20 is overlaid on the absorbent body 18 . A pair of pressing rollers 39 are provided at the bonding position. A pair of pressing rollers 39 press the cover sheet 17A against the absorber 18, the cover sheet 17A and the back sheet 17 to integrate them. Through such steps, the absorbent main body 16 having the hot-melt adhesive 20 applied to the outer peripheral portion of the absorbent body 18 can be manufactured.

- As a disposable diaper, a tape-type diaper may be used. Disposable diapers for infants or adults such as elderly people and disabled people who need nursing care may also be used. Furthermore, the absorbent article may also be urine pads, light incontinence pads, sanitary napkins, and the like.

10A... Waist opening, 10C... Crotch part, 10F... Front body, 10L... Leg opening, 10R... Back body, 10W... Waist part, 11... Joining part, 12... Exterior body, 12F... First exterior Body 12R...Second exterior body 13...Leg gathers 13E...Second elastic member 14...Three-dimensional gathers 14E...First elastic member 14S...Side sheet 15...Elastic member 16...Absorptive main body 17... Back sheet 17A Cover sheet 18 Absorbent body 18A Core wrap 19 Top sheet 20 Hot-melt adhesive 20A Bonded portion 20B Non-bonded portion 21 Exterior sheet 21A Inner sheet element , 21B... outer sheet element, 22... cushion sheet element, 23A... seat structure, 24... gap, 24A... adhesive part, 25... uneven part, 26... cushion sheet element, 27... uneven part, 28... convex part, 31 Wall portion 32 Concave portion 33 Convex portion 34 Position corresponding to the anus 36 Wall portion 37 First conveying roller 38 Second conveying roller 39 Pressure roller 40 Supply mechanism 41... Duplicate application part.

Claims (7)

an absorber;
a top sheet positioned on the skin side with respect to the absorbent body;
a back sheet located on the side opposite to the skin with respect to the absorbent body,
Between the absorbent body and the top sheet, there is provided a bonded portion to which a bubble-containing hot-melt adhesive is applied and adhered, and a non-bonded portion to which the bubble-containing hot-melt adhesive is not applied. ,
The adhesive portion is positioned on the outer peripheral portion of the absorbent body and constitutes a wall portion,
The accommodation portion configured inside the wall portion includes:
Between the absorbent body and the top sheet, the bubble-containing hot melt adhesive or the bubble-free hot melt adhesive is used so that the bubble-containing hot melt adhesive constituting the wall portion is bulkier. A part to which a melt adhesive is applied and adhered, and the non-adhered part,
The non-bonded portion is coated with neither the bubble-containing hot-melt adhesive nor the bubble-free hot-melt adhesive. an absorber;
a top sheet positioned on the skin side with respect to the absorbent body;
An absorbent article comprising a back sheet located on the side opposite to the skin with respect to the absorbent body,
Between the absorbent body and the top sheet, there is provided a bonded portion to which a bubble-containing hot-melt adhesive is applied and adhered, and a non-bonded portion to which the bubble-containing hot-melt adhesive is not applied. ,
The adhesive portion has a dot shape and is provided in plurality so as to surround a position corresponding to the anus when the absorbent article is worn,
The plurality of adhesive portions constitutes a storage portion in a region surrounded by the plurality of adhesive portions, and the dot shape becomes smaller as the distance from the position corresponding to the anus in the front-rear direction increases. 2. The area between the absorbent body and the backsheet is provided with a portion to which the bubble-containing hot-melt adhesive is applied and adhered, and a portion to which the bubble-containing hot-melt adhesive is not applied. 2. The absorbent article according to 2. At least one of a front body covering the wearer's abdomen and a back body covering the wearer's back is provided with waist gathers,
said waist gathers comprising at least two sheet elements;
4. Any one of claims 1 to 3 , wherein the two sheet elements comprise a portion bonded with the bubble-containing hot melt adhesive and a portion not coated with the bubble-containing hot melt adhesive. Absorbent article according to the paragraph. The bubble-containing hot melt adhesive is
The content of the bubbles is 20% or more and 50% or less in volume ratio,
The coating amount is 1.5 g/m ² or more and 10 g/m ² or less,
5. The absorbent article according to any one of claims 1 to 4 , which is rubber-based or olefin-based. The absorbent article according to any one of claims 1 to 5 , wherein the non-bonded portions between the bonded portions constitute air passages. The foam-containing hot-melt adhesive is applied between the top sheet and the back sheet and along the outer peripheral edge of the absorbent body so as to overlap the outer peripheral edge of the absorbent body. 7. The absorbent article according to any one of claims 1-6 .

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