JP6943686B2 - Absorbents and absorbent articles - Google Patents

Description

The present invention relates to an absorber used for an absorbent article such as a urine pad (including a light incontinence pad), a sanitary napkin, and a disposable diaper, and an absorbent article provided with the absorber.

Conventionally, an absorbent article having an absorbent core having an opening is known (for example, Patent Documents 1 and 2). In the absorbent article provided with such an absorbent core, the diffusivity of the body fluid such as urine is enhanced by the opening, and the body fluid can be rapidly absorbed by the absorbent core. On the other hand, Patent Document 3 discloses an absorbent article in which a water-absorbent resin is arranged in the opening of the absorbent core in order to allow the opening of the absorbent core to absorb body fluid. The absorbent article of Patent Document 3 has an absorber in which an absorbent core is arranged between the upper core wrap sheet and the lower core wrap sheet, and the upper core wrap sheet and the lower core wrap are provided at the opening of the absorbent core. A water-absorbent resin is sandwiched between the sheets.

Jikkai Sho 63-093921 Japanese Unexamined Patent Publication No. 2013-017531 Japanese Unexamined Patent Publication No. 2012-179230

An absorber in which a water-absorbent resin is arranged at the opening of the absorbent core can have the absorbency of body fluid at the opening, but since the water-absorbent resin is a relatively hard particle, such When an absorbent article provided with an absorbent body is worn, the water-absorbent resin arranged in the opening of the absorbent core may strongly hit the wearer's skin through the top sheet. In this case, the wearer tends to feel a rough feeling to the water-absorbent resin, and the wearing feeling of the absorbent article tends to decrease.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorbent body in which a water-absorbent resin is arranged at an opening of an absorbent core, which is excellent in wearing comfort, and the absorbent body. The purpose is to provide a provided absorbent article.

The absorber of the present invention that could solve the above-mentioned problems is an absorber used for absorbing body fluid and having a skin surface side and a non-skin surface side; the absorber is in the width direction. It has an absorbent core with a longitudinal opening in the center and a coating sheet provided to cover the absorbent core from the non-skin side to the skin side; the coating sheet is the skin surface of the absorbent core. When the part on the side is the upper part and the part on the non-skin surface side of the absorbent core is the lower part, the upper part is the first upper part extending from one side in the width direction to the central part in the width direction. It has a portion and a second upper portion extending from the other side in the width direction to the central portion in the width direction, and is formed by overlapping the first upper portion and the second upper portion at a portion overlapping the opening of the absorbent core. It is characterized in that a water-absorbent resin is arranged on the skin surface side of the lower portion of the coating sheet so as to overlap with the opening of the absorbent core.

In the absorber of the present invention, since the water-absorbent resin is arranged on the skin surface side of the lower part of the coating sheet at the portion overlapping with the opening of the absorbent core, the body fluid can be absorbed even at the opening of the absorbent core. It has, and the absorption capacity of the entire absorber can be increased. At this time, since the upper portion of the coating sheet is formed in a plurality of layers at the portion overlapping the opening of the absorbent core, the covering sheet acts as a cushion at the portion overlapping the opening of the absorbent core, and the opening of the absorbent core. The water-absorbent resin placed on the skin is hard to hit the wearer's skin. Therefore, even when the water-absorbent resin is placed in the opening of the absorbent core, it is possible to suppress a decrease in the wearing feeling of the absorbent article provided with the absorbent body.

It is preferable that the first upper portion and the second upper portion are non-adhesive to each other at a portion overlapping the opening of the absorbent core. As a result, the cushioning property of the covering sheet can be enhanced at the portion overlapping the opening of the absorbent core.

The first upper portion and the second upper portion are preferably bonded to the lower portion at a portion overlapping the opening of the absorbent core. If the first upper portion and the second upper portion of the covering sheet are adhered to the lower portion at the portion overlapping the opening of the absorbent core, the first upper portion and the second upper portion are stably formed of the absorbent core. It is more likely to be present in the opening. In addition, the shape retention of the absorber can be enhanced.

The absorber may be provided with a folded portion in which the first upper portion and / or the second upper portion is folded back to the skin surface side or the non-skin surface side at a portion overlapping the opening of the absorbent core. By providing the folded portion, the number of layers on the upper side of the covering sheet is formed to be three or more at the opening of the absorbent core, and the presence of the water-absorbent resin arranged on the skin surface side of the lower part of the covering sheet is present. It is less likely to be felt by the wearer. At this time, from the viewpoint of enhancing the cushioning property of the covering sheet, it is preferable that the first upper portion and / or the second upper portion is folded back toward the skin surface side. Further, from the viewpoint of neatly forming the skin surface side of the absorber, the first upper portion is formed so as to overlap the skin surface side of the second upper portion at the portion overlapping the opening of the absorbent core, and the second upper portion is formed. It is preferable that the skin is folded back to the skin side or the non-skin side.

It is preferable that the folded portion of the first upper portion and / or the folded portion of the second upper portion is provided only inward in the width direction with respect to both side edges in the width direction of the opening of the absorbent core. By forming the folded-back portion in this way, even if the folded-back portion fits in the opening and the folded-back portion is formed to be bulky, the folded-back portion makes it difficult for the wearer to feel a sense of discomfort.

The water-absorbent resin arranged on the skin surface side of the lower portion of the coating sheet and overlapping the opening of the absorbent core preferably has an angle of repose of 45 ° or less. As a result, at the opening of the absorbent core, the smoothness at the portion where the water-absorbent resin is arranged is enhanced, and the wearer is less likely to feel the graininess of the water-absorbent resin.

The present invention also comprises the absorber of the present invention, a liquid-permeable top sheet provided on the skin surface side of the absorber, and a liquid-impermeable back sheet provided on the non-skin surface side of the absorber. Also provided are absorbent articles having. By providing the absorbent body of the present invention described above, the absorbent article of the present invention has excellent absorbency of body fluids such as urine and also has a good wearing feeling.

It is preferable that the absorbent article is provided with a protective sheet between the absorber and the back sheet so as to overlap the opening of the absorbent core. By providing the protective sheet, when the absorbent article is touched from the back sheet side, the graininess of the water-absorbent resin arranged in the opening of the absorbent core is less likely to be felt. Further, when the back sheet is made of a plastic film, the back sheet is less likely to be damaged by the absorbent resin arranged on the lower side of the covering sheet.

In the absorber of the present invention, the water-absorbent resin is arranged at the opening of the absorbent core, and the upper portion of the coating sheet is formed in a plurality of layers at the portion overlapping the opening, so that the portion overlapping the opening of the absorbent core The covering sheet acts as a cushion, and the water-absorbent resin placed in the opening of the absorbent core makes it difficult for the wearer to hit the skin strongly. Therefore, even when the water-absorbent resin is placed in the opening of the absorbent core, it is possible to suppress a decrease in the wearing feeling of the absorbent article provided with the absorbent body.

An example of the absorber of the present invention is shown, and a plan view of the absorber as viewed from the non-skin surface side is shown. An example of the AA cross-sectional view (width direction cross-sectional view) of the absorber shown in FIG. 1 is shown. Another example of the cross-sectional view in the width direction of the absorber of the present invention is shown. An example of the absorbent article provided with the absorber shown in FIG. 1 is shown, and a plan view of the absorbent article as viewed from the skin surface side is shown. FIG. 4 shows a cross-sectional view taken along the line BB of the absorbent article shown in FIG.

The absorber of the present invention is used for absorbing body fluids such as urine, and is provided for absorbent articles such as urine pads (including incontinence pads), disposable diapers, and sanitary napkins. The absorber absorbs and fixes body fluids such as urine received by the absorbent article, and is provided, for example, between the top sheet and the back sheet of the absorbent article. Hereinafter, the absorber of the present invention will be specifically described with reference to the drawings, but the present invention is not limited to the embodiments shown in the drawings.

1 and 2 show an example of the absorber of the present invention. FIG. 1 shows a plan view of the absorber as viewed from the non-skin surface side, and FIG. 2 shows an example of the AA cross-sectional view (width direction cross-sectional view) of the absorber shown in FIG. In the drawings, the arrow x represents the width direction, the arrow y represents the longitudinal direction, and the direction perpendicular to the surface formed by the arrows x and y represents the thickness direction z. In the thickness direction z, z1 represents the skin surface side and z2 represents the non-skin surface side.

In the absorber, the longitudinal direction y corresponds to a direction extending in the anteroposterior direction of the wearer's crotch when the wearer wears the absorbent article provided with the absorber. The width direction x means a direction that is on the same plane as the absorber and is orthogonal to the longitudinal direction y. The absorber has a skin surface side and a non-skin surface side with respect to the thickness direction z. The skin surface side means the wearer side when the absorbent article is worn, and corresponds to the top sheet side when the absorbent body is taken as a reference. The non-skin surface side means the side opposite to the wearer when the absorbent article is worn, that is, the outside, and corresponds to the back seat side with the absorbent body as a reference.

The absorber 1 has an absorbent core 2 and a coating sheet 4 that covers the skin surface side and the non-skin surface side of the absorbent core 2. The covering sheet 4 is made of a paper sheet (for example, tissue paper or thin paper), a liquid-permeable non-woven fabric, or the like, and is provided to maintain the absorbent core 2 in a predetermined shape. The covering sheet 4 is provided so as to cover the absorbent core 2 from the non-skin surface side to the skin surface side. Specifically, the covering sheet 4 extends over the entire width direction x of the absorbent core 2 on the non-skin surface side of the absorbent core 2 and absorbs along both side edges of the absorbent core 2 in the width direction x. It is folded back toward the skin surface side of the sex core 2 and is provided so that both ends of the covering sheet 4 in the width direction x are located on the skin surface side of the absorbent core 2. It is preferable that the entire skin surface side and non-skin surface side of the absorbent core 2 are covered with the covering sheet 4, but even if a part of the side surface of the absorbing core 2 is not covered with the covering sheet 4. good. Of the covering sheet 4, the portion of the absorbent core 2 on the skin surface side is referred to as an upper portion 5, and the portion of the absorbent core 2 on the non-skin surface side is referred to as a lower portion 6.

The covering sheet 4 is preferably composed of a paper sheet. The paper sheet can be used without particular limitation as long as it is formed into a sheet by entwining plant fibers with each other, and a tissue is particularly preferably used. The paper sheet can be produced, for example, by a wet papermaking method. The thickness of the covering sheet 4 is, for example, preferably 300 μm or less, more preferably 200 μm or less, further preferably 100 μm or less, still more preferably 5 μm or more, still more preferably 10 μm or less, still more preferably 20 μm or more. The thickness of the coating sheet is measured according to JIS P 8118 (2014).

The absorbent core 2 is not particularly limited as long as it contains an absorbent material capable of absorbing body fluids such as urine, but is preferably formed from an aggregate of hydrophilic fibers. Examples of hydrophilic fibers include natural fibers such as pulp fibers; regenerated fibers such as rayon fibers; semi-synthetic fibers such as acetate fibers; polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and polyamide fibers such as nylon. As the fiber, a fiber or the like which has been hydrophilized with a surfactant or the like can be used. The absorbent core 2 may contain a water-absorbent resin such as polyacrylic acid-based, polyaspartic acid-based, cellulosic-based, starch / acrylonitrile-based.

The absorbable core 2 preferably contains at least hydrophilic fibers, and more preferably pulp fibers, from the viewpoint of increasing the absorption rate of urine and the like and enhancing the shape retention. Further, from the viewpoint of increasing the absorption capacity, the absorbent core 2 preferably contains hydrophilic fibers and a water-absorbent resin. In this case, as the absorbent core 2, for example, it is preferable to use an aggregate of hydrophilic fibers mixed or sprayed with a water-absorbent resin.

The shape (planar shape) of the absorbent core 2 is not particularly limited. The shape of the absorbent core 2 may be appropriately determined according to the intended use, and examples thereof include a substantially rectangular shape, an hourglass shape, a gourd shape, and a battledore shape. The absorbent core 2 may be formed by laminating a plurality of layers. In the drawing, the absorbent core 2 is formed in an hourglass shape.

The thickness of the absorbent core 2 is, for example, preferably 1 mm or more, more preferably 2 mm or more, preferably 12 mm or less, more preferably 10 mm or less, still more preferably 8 mm or less. The thickness of the absorbent core described here means the thickness of the thickest portion of the absorbent core. The thickness of the absorbent core can be measured with a thickness gauge, for example, using a thickness gauge SM-130 manufactured by Teclock Co., Ltd. For example, the thickness is measured by sandwiching the absorbent core between the anvil and the stylus, and at that time, the thickness gauge SM-130 measures the thickness so that the final pressure is 2.2 N or less. The anvil and the stylus have a circular contact surface with a diameter of 10 mm and a flat contact surface.

The absorbent core 2 is formed with an opening 3 extending in the longitudinal direction y at the center of the width direction x. Specifically, the opening 3 includes the center line of the absorbent core 2 in the width direction x, and is formed so as to extend in the longitudinal direction y along the center line. The opening 3 is provided so as to penetrate the absorbent core 2 in the thickness direction z. Further, the opening extending in the longitudinal direction y means an opening having a shape longer in the longitudinal direction y than in the width direction x. Since the opening 3 formed in the absorbent core 2 functions as a diffusion path for the body fluid such as urine in the longitudinal direction y, the body fluid such as urine is easily absorbed by the absorbent core 2 quickly, and the body fluid such as urine is easily absorbed by the absorbent core 2. The absorbable core 2 tends to contribute to the absorption of body fluids such as urine over a wide range.

The absorbent core 2 may be provided with only one opening 3 or two or more openings 3, but preferably only one opening 3 is provided in the absorbent core 2. That is, it is preferable that the absorbent core 2 is provided with only one opening 3, and the opening 3 is provided at the center of the width direction x so as to extend in the longitudinal direction y.

The length of the opening 3 in the width direction x is preferably 5% or more, more preferably 8% or more, and 10% or more of the length of the narrowest portion of the absorbent core 2 in the width direction x. More preferably, 30% or less is preferable, 25% or less is more preferable, and 20% or less is further preferable. The narrowest portion of the absorbent core 2 means the narrowest portion of the absorbent core 2 excluding both ends in the longitudinal direction y. For example, the absorbent core 2 is set to y in the longitudinal direction. When divided into five equal parts, it means the portion formed narrowest in the width direction x except for the portion of 1/5 on one side and 1/5 of the other side in the longitudinal direction y. The width of the opening 3 is also preferably 5 mm or more, more preferably 8 mm or more, preferably 35 mm or less, and more preferably 25 mm or less.

The length of the opening 3 in the longitudinal direction y is preferably 40% or more, more preferably 50% or more, further preferably 60% or more, and 90% or more of the length in the longitudinal direction y of the absorbent core 2. The following is preferable, 85% or less is more preferable, and 80% or less is further preferable. The opening 3 is preferably provided so as not to come into contact with the outer edge of the absorbent core 2.

When the absorbent core 2 is formed in an hourglass shape, the opening 3 is preferably provided at least in an hourglass-shaped constriction. That is, the absorbent core 2 has one end, the other end, and an intermediate portion between them in the longitudinal direction y, and one end and the other end of the absorbent core 2 are formed wider than the intermediate portion. , It is preferable that the opening 3 is provided at least in the middle portion. The opening 3 may further extend to one end and / or the other end.

As shown in FIG. 2, in the absorber 1, a water-absorbent resin 8 is arranged on the skin surface side of the lower portion 6 of the coating sheet 4 and at a portion overlapping the opening 3 of the absorbent core 2. By arranging the water-absorbent resin 8 in the portion overlapping the opening 3 of the absorbent core 2 in this way, the absorber 1 has the absorbency of the body fluid even in the opening 3 of the absorbent core 2. Therefore, the absorption capacity of the entire absorber can be increased.

In the opening 3 of the absorbent core 2, the water-absorbent resin 8 is preferably fixed to the coating sheet 4 with an adhesive. At this time, it is preferable that the water-absorbent resin 8 is not hindered by the adhesive from absorbing water or swelling. It is preferable that the water-absorbent resin 8 is fixed to the water-absorbent resin 8. The net-like adhesive layer can be formed by applying an adhesive by a curtain spray method, a spiral coating method, an omega coating method, or the like. As the adhesive, for example, a hot melt adhesive can be used.

When the water-absorbent resin 8 is arranged in the opening 3 of the absorbent core 2, since the water-absorbent resin is relatively hard particles, when an absorbent article having such an absorber 1 is worn, the absorbent core 2 is worn. The water-absorbent resin 8 arranged in the opening 3 of the above may strongly hit the wearer's skin via the top sheet. When the water-absorbent resin strongly hits the wearer's skin through the top sheet in this way, the wearer tends to feel a rough feeling to the water-absorbent resin, and the wearing feeling of the absorbent article tends to decrease.

Therefore, in the absorber 1, the upper portion 5 of the covering sheet 4 is formed into a plurality of layers at a portion overlapping the opening 3 of the absorbent core 2. Specifically, the upper portion 5 of the covering sheet 4 has a first upper portion 5A extending from one side of the width direction x to the central portion of the width direction x and the center of the width direction x from the other side of the width direction x. It has a second upper portion 5B extending to the portion, and is formed by overlapping the first upper portion 5A and the second upper portion 5B at a portion overlapping the opening 3 of the absorbent core 2. The covering sheet 4 covers the non-skin surface side and the skin surface side of the absorbent core 2 so as to wrap the absorbent core 2 from the non-skin surface side, and the first upper portion 5A is the lower portion of the covering sheet 4. It is connected to 6 on one side of the width direction x of the absorbent core 2 and extends from one side of the width direction x of the absorbent core 2 to at least the central portion of the width direction x (that is, the portion overlapping the opening 3). The second upper portion 5B is connected to the lower portion 6 of the covering sheet 4 on the other side of the absorbent core 2 in the width direction x, and is at least the center of the absorbent core 2 from the other side in the width direction x in the width direction x. It extends to the department. By forming the covering sheet 4 in this way, the covering sheet 4 acts as a cushion at the portion overlapping the opening 3 of the absorbent core 2, and the water-absorbent resin 8 arranged in the opening 3 of the absorbent core 2 is worn. It becomes hard to hit the person's skin strongly. Therefore, even when the water-absorbent resin 8 is arranged in the opening 3 of the absorbent core 2, it is possible to suppress a decrease in the wearing feeling of the absorbent article provided with the absorbent body 1.

In the portion where the first upper portion 5A and the second upper portion 5B of the covering sheet 4 overlap, either the first upper portion 5A or the second upper portion 5B may be located on the upper side (skin surface side). In the absorber 1 shown in FIGS. 1 and 2, the first upper portion 5A is located above the second upper portion 5B. It is preferable that the first upper portion 5A and the second upper portion 5B do not completely cover the skin surface side of the absorbent core 2 by themselves, and the first upper portion 5A and the second upper portion 5B, respectively, are absorbent, for example. It is preferably provided so as to cover 70% or less of the area of the core 2 on the skin surface side (area including the opening 3), and more preferably 65% or less.

It is preferable that the first upper portion 5A and the second upper portion 5B are non-adhesive to each other at a portion overlapping the opening 3 of the absorbent core 2. By making the first upper portion 5A and the second upper portion 5B non-adhesive to each other at the portion overlapping the opening 3 of the absorbent core 2, the cushioning property of the covering sheet 4 is enhanced at the portion overlapping the opening 3 of the absorbent core 2. be able to.

It is preferable that at least one of the first upper portion 5A and the second upper portion 5B is adhered to the lower portion 6 at a portion overlapping the opening 3 of the absorbent core 2. If the upper portion 5 and the lower portion 6 of the covering sheet 4 are adhered to each other at a portion overlapping the opening 3 of the absorbent core 2, the covering sheet 4 can stably wrap the absorbent core 2. At this time, the upper portion 5 may be adhered to the lower portion 6 via the water-absorbent resin 8. In the drawings, in order to facilitate understanding of the configuration of the absorber 1, the upper portion 5 and the lower portion 6 are separated from each other in the opening 3.

It is preferable that both the first upper portion 5A and the second upper portion 5B are adhered to the lower portion 6 at a portion overlapping the opening 3 of the absorbent core 2. In this case, of the first upper portion 5A and the second upper portion 5B, the one located on the lower side (non-skin surface side) does not completely cover the opening 3. In FIG. 2, the second upper portion 5B located on the lower side does not completely cover the opening 3, so that the second upper portion 5B is adhered to the lower side portion 6 at the opening 3 and the second upper portion is formed. The first upper portion 5A is adhered to the lower portion 6 at a portion where the 5B and the opening 3 do not overlap. If the first upper portion 5A and the second upper portion 5B are adhered to the lower portion 6 in this way, the first upper portion 5A and the second upper portion 5B are stably present in the opening 3 of the absorbent core 2. It will be easier to do. Further, the absorbent core 2 is stably covered by the covering sheet 4, and the shape retention of the absorber 1 can be improved.

The absorber 1 is provided with a folded portion in which the first upper portion 5A and / or the second upper portion 5B is folded back to the skin surface side or the non-skin surface side at a portion overlapping the opening 3 of the absorbent core 2. May be good. FIG. 3 shows a modified example of the cross-sectional view of the absorber in the width direction. In FIG. 3, the second upper portion 5B is folded back toward the skin surface side with respect to the width direction x to form the folded portion 7. The folded portion 7 is located at a position where it overlaps with the opening 3 of the absorbent core 2. By providing the folded-back portion 7 in this way, the number of layers of the upper portion 5 of the covering sheet 4 (the number of layers in which the first upper portion 5A and the second upper portion 5B are combined) is 3 in the opening 3 of the absorbent core 2. The presence of the water-absorbent resin 8 formed on the layer or more and arranged on the skin surface side of the lower portion 6 of the covering sheet 4 is less likely to be felt by the wearer. Although not shown in the drawing, the folded portion 7 may be formed on the first upper portion 5A, and the first upper portion 5A and / or the second upper portion 5B is formed by being folded back to the non-skin surface side. May be good. From the viewpoint of enhancing the cushioning property of the covering sheet 4, it is preferable that the first upper portion 5A and / or the second upper portion 5B is folded back toward the skin surface to form the folded-back portion 7.

The folded-back portion 7 of the first upper portion 5A is preferably non-adhesive to the first upper portion 5A. Similarly, it is preferable that the folded-back portion 7 of the second upper portion 5B is non-adhesive to the second upper portion 5B. Since one side and the other side sandwiching the fold forming the folded portion 7 are not adhered to each other in this way, the cushioning property of the folded portion 7 can be enhanced.

It is preferable that the folded-back portion 7 of the first upper portion 5A and / or the second upper portion 5B is provided only inside the width direction x rather than both side edges of the opening 3 of the absorbent core 2 in the width direction x. That is, it is preferable that the folded portion 7 formed by folding the first upper portion 5A and / or the second upper portion 5B in the width direction x is provided only in the portion overlapping the opening 3 in the width direction x. .. By forming the folded-back portion 7 in this way, even if the folded-back portion 7 fits in the opening 3 and the folded-back portion 7 is formed to be bulky, the folded-back portion 7 makes it difficult for the wearer to feel a sense of discomfort.

The folded-back portion 7 is preferably formed on the lower side (non-skin surface side) of the first upper portion 5A and the second upper portion 5B. That is, as shown in FIG. 3, the first upper portion 5A is formed so as to overlap the skin surface side of the second upper portion 5B at the portion overlapping the opening 3 of the absorbent core 2, and the second upper portion 5B is formed on the skin surface side. Alternatively, it is preferable that the folded portion 7 is formed by folding back to the non-skin surface side. When the folded-back portion 7 is formed in this way, the skin surface side of the absorbent body 1 can be neatly formed while the cushioning property is imparted by the covering sheet 4 at the opening 3 of the absorbent core 2. .. In this case, it is preferable that the folded-back portion 7 is not formed on the first upper portion 5A.

The coating sheet 4 is preferably adhered to the absorbent core 2 with an adhesive. Specifically, it is preferable that the coating sheet 4 is adhered to an aggregate of hydrophilic fibers constituting the absorbent core 2 with an adhesive. As a result, the covering sheet 4 is firmly bonded to the absorbent core 2, and the integrity of the covering sheet 4 and the absorbent core 2 is enhanced. Also in this case, it is preferable that the coating sheet 4 and the absorbent core 2 are adhered to each other by the reticulated adhesive layer as described above. As the adhesive, for example, a hot melt adhesive can be used.

The water-absorbent resin 8 arranged in the opening 3 of the absorbent core 2 is preferably one that the wearer does not feel rough through the covering sheet 4 or the top sheet of the absorbent article. From such a point, the water-absorbent resin 8 arranged on the skin surface side of the lower portion 6 of the covering sheet 4 preferably has an angle of repose of 45 ° or less. As a result, in the opening 3 of the absorbent core 2, the smoothness at the portion where the water-absorbent resin 8 is arranged is enhanced, and the wearer is less likely to feel the roughness due to the water-absorbent resin. The angle of repose of the water-absorbent resin is more preferably 35 ° or less, still more preferably 30 ° or less. The angle of repose of the water-absorbent resin is 24 according to JIS R 9301-2-2 (1999) under the conditions of a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5% with respect to the water-absorbent resin before water absorption. Obtained by measuring after storing for more than an hour.

The amount of the water-absorbent resin 8 arranged on the skin surface side of the lower portion 6 of the coating sheet 4 and overlapping with the opening 3 of the absorbent core 2 is, for example, ^{preferably 5 g / m 2} or more, preferably 15 g / m ^2. The above is more preferable, 30 g / m ² or more is further preferable, 300 g / m ² or less is preferable, 200 g / m ² or less is more preferable, and 150 g / m ² or less is further preferable. By arranging the water-absorbent resin 8 in the opening 3 of the absorbent core 2 in such an amount, the absorbability of body fluid such as urine can be improved in the opening 3 of the absorbent core 2, and the absorbent core 2 can be improved. It becomes easy to secure the diffusivity of body fluids such as urine in the opening 3 of.

A water-absorbent resin may be arranged on the skin surface side of the lower side portion 6 of the covering sheet 4 so as to be a portion that does not overlap with the opening 3 of the absorbent core 2. For example, a water-absorbent resin may be arranged between the fiber aggregate of the absorbent core 2 and the lower portion 6 of the coating sheet 4. Thereby, the absorption capacity of the absorber 1 can be further increased.

Next, the absorbent article of the present invention will be described. The absorbent article of the present invention is characterized in that the absorbent body of the present invention is provided, and the absorbent body of the present invention is arranged between the top sheet and the back sheet. Examples of the absorbent article include a urine pad (including an incontinence pad), a disposable diaper, a sanitary napkin, and the like. By providing the absorbent body described above, the absorbent article of the present invention has excellent absorbency of body fluids such as urine and also has a good wearing feeling.

The shape of the absorbent article is not particularly limited. When the absorbent article is, for example, a urine pad or a sanitary napkin, the shape of the absorbent article may be rectangular, hourglass-shaped, gourd-shaped, battledore-shaped or the like.

When the absorbent article is a disposable diaper, the disposable diaper may be a tape-type disposable diaper in which fastening members are provided on both the left and right sides and the fastening members form a pants shape when worn, and the waist opening. It may be a pants-type disposable diaper in which a pair of diapers and a pair of leg openings are formed. In a pants-type disposable diaper, even if the absorbent body of the present invention is arranged between the top sheet and the back seat, the absorbent body is attached to the skin side of the exterior member formed in the shape of pants. good.

The top sheet is provided on the skin surface side of the absorber and is liquid permeable. The top sheet is provided so as to face the wearer's skin when wearing the absorbent article. Examples of the top sheet include non-woven fabrics formed from hydrophilic fibers such as cellulose, rayon and cotton; and hydrophobicity such as polyolefins (eg polypropylene, polyethylene), polyesters (eg PET) and polyamides (eg nylon). A non-woven fabric formed from fibers, in which the surface of the hydrophobic fibers is hydrophilized by a surfactant, or the like can be used. Further, as the top sheet, a woven fabric, a knitted fabric, or a plastic film having holes may be used.

The back sheet is provided on the non-skin surface side of the absorber and is impermeable to liquid. The backseat is provided so as to face the side opposite to the wearer, that is, the outside when the absorbent article is worn. As the back sheet, a non-woven fabric formed of hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), and polyamide (for example, nylon), a plastic film, or the like can be used. Further, a laminate of a non-woven fabric and a plastic film may be used.

When the top sheet or back sheet is composed of a non-woven fabric, it is preferable to use a spunbonded non-woven fabric, an air-through non-woven fabric, a point-bonded non-woven fabric, a melt-blown non-woven fabric, an air-laid non-woven fabric, an SMS non-woven fabric, or the like.

The absorbent article may be provided with a protective sheet between the absorber and the backsheet, overlapping the opening of the absorbent core. As the protective sheet, a sheet material that can be used for a top sheet or a back sheet can be used, and it is preferable that the protective sheet is composed of a non-woven fabric, a woven fabric, a knitted fabric, or the like. By providing the protective sheet in this way, when the absorbent article is touched from the back sheet side, the graininess of the water-absorbent resin arranged in the opening of the absorbent core is less likely to be felt. Further, when the back sheet is made of a plastic film, the back sheet is less likely to be damaged by the absorbent resin arranged on the lower side of the covering sheet.

The protective sheet is preferably provided so as to completely cover the opening of the absorbent core. If the water-absorbent resin is also arranged in the lower part of the coating sheet of the absorber that does not overlap with the opening of the absorbent core, a protective sheet is provided so as to overlap the area where the water-absorbent resin is arranged. Is preferable. Therefore, it is preferable that the protective sheet is formed wider in the width direction than the region where the water-absorbent resin of the coating sheet is arranged.

The protective sheet is preferably formed narrower in the width direction than the absorber. As a result, the protective sheet and the back sheet do not form the entire non-skin surface side of the absorbent article thickly, and the decrease in flexibility of the non-skin surface side of the absorbent article is suppressed. More preferably, the protective sheet is formed narrower in the width direction than the absorbent core.

It is preferable that the absorbent article is provided with rising flaps on both sides in the width direction on the skin surface side. By providing the rising flap, lateral leakage of body fluid such as urine is prevented. For the rising flap, for example, side sheets extending in the longitudinal direction are joined to both sides in the width direction of the top sheet, and elastic members are provided inward in the width direction of the side sheet (near the upper end when the rising flap rises). Is formed by. By providing the side sheet and the elastic member in this way, the inner side of the side sheet in the width direction rises toward the wearer's skin due to the contraction force of the elastic member, and a rising flap is formed. The rising flap or side sheet is preferably made of a liquid-impermeable plastic film, a liquid-impermeable non-woven fabric, or the like.

The absorbent article of the present invention will be described with reference to FIGS. 4 and 5 by taking a tape-type disposable diaper as an example. The absorbent article of the present invention is not limited to the embodiments shown in the drawings. 4 and 5 show an absorbent article with the absorbers shown in FIGS. 1 and 2. FIG. 4 shows a plan view of a tape-type disposable diaper as an absorbent article as viewed from the skin surface side, and FIG. 5 shows a cross-sectional view taken along the line BB of the absorbent article shown in FIG.

The absorbent article 11 has a top sheet 12, a back sheet 13, and an absorber 1 provided between them. The top sheet 12 is arranged so as to face the wearer's skin and allows body fluids such as urine to permeate. The body fluid that has passed through the top sheet 12 is housed in the absorber 1. The backsheet 13 is liquid impermeable and prevents body fluids from leaking to the outside.

A protective sheet 14 is provided between the absorber 1 and the back sheet 13 so as to overlap the opening 3 of the absorbent core 2. By providing the protective sheet 14, when the absorbent article 11 is touched from the back sheet 13 side, the graininess of the water-absorbent resin 8 arranged in the opening 3 of the absorbent core 2 can be reduced. Further, it is possible to prevent the back sheet 13 from being damaged by the protective sheet 14, such as when the absorbent resin 8 forms minute irregularities on the non-skin surface side of the absorber 1. It is preferable that the protective sheet 14 is formed wider in the width direction x than the region where the water-absorbent resin 8 is arranged on the covering sheet 4, and is formed narrower in the width direction x than the absorber 1.

It is preferable that the absorbent article 11 is provided with liquid-impermeable side sheets 15 extending in the longitudinal direction y on both sides of the top sheet 12 in the width direction x. The side sheet 15 is joined to the top sheet 12 at the joint portion 18, and the inner portion in the width direction x from the joint portion 18 is formed so as to be able to stand up from the top sheet 12, and the side sheet 15 is formed to be erected from the top sheet 12 and is outward in the width direction x from the joint portion 18. A portion is provided so as to overlap the back sheet 13. When the inner portion of the side sheet 15 in the width direction x stands up, a rising flap 16 is formed, whereby lateral leakage of urine or the like can be prevented. Since the inner portion of the side sheet 15 in the width direction x is formed so as to be able to stand up from the top sheet 12, the side sheet 15 has a longitudinal direction y in the inner portion of the width direction x than the joint portion 18. It is preferable that the extending elastic member 17 for standing up is provided.

Fastening tape 21 is attached to the left and right end portions of the rear side portion (one portion in the longitudinal direction y) of the absorbent article 11. The fastening tape 21 is configured by providing a fastener 23 on the base sheet 22. The absorbent article 11 is placed in the crotch of the wearer, and the fastener 23 of the fastening tape 21 is joined to the outer surface (target tape 24 in FIG. 4) of the front side portion (the other portion in the longitudinal direction y) of the absorbent article 11. By doing so, it can be attached. As the fastener 23, a hook member of a hook, a loop, or a fastener or an adhesive can be adopted.

It is preferable that leg elastic members 19 extending in the longitudinal direction y are provided on both sides of the absorbent article 11 in the width direction x. The leg elastic member 19 can form gathers around the wearer's legs to improve the fit around the legs and prevent lateral leakage.

It is preferable that the waist elastic member 20 extending in the width direction x is provided at the end of the absorbent article 11 in the longitudinal direction y. The waist elastic member 20 forms waist gathers along the waist of the wearer to prevent leakage of urine or the like from the abdomen or back.

1: Absorbent 2: Absorbent core 3: Opening 4: Covering sheet 5: Upper part of the covering sheet 5A: First upper part, 5B: Second upper part 6: Lower part of the covering sheet 7: Of the covering sheet Folded part on the upper side 8: Water-absorbent resin 11: Absorbent article 12: Top sheet 13: Back sheet 14: Protective sheet

Claims (8)

It is an absorber that is used to absorb body fluids and has a skin surface side and a non-skin surface side.
The absorber has an absorbent core having an opening extending in the longitudinal direction in the central portion in the width direction, and a coating sheet provided so as to cover the absorbent core from the non-skin surface side to the skin surface side.
When the portion of the covering sheet on the skin surface side of the absorbent core is the upper portion and the portion of the absorbent core on the non-skin surface side is the lower portion, the upper portion is one in the width direction. It has a first upper portion extending from the side to the central portion in the width direction and a second upper portion extending from the other side in the width direction to the central portion in the width direction, and overlaps with the opening of the absorbent core. In the portion, the first upper portion is formed so as to overlap the skin surface side of the second upper portion.
The first upper portion is provided so as to cover the entire opening.
The first upper portion and the second upper portion are non-adhesive to each other at a portion overlapping the opening of the absorbent core, and the first upper portion and the second upper portion are formed by the absorbent core. It is adhered to the lower part at the portion overlapping the opening of the
An absorber characterized in that a water-absorbent resin is arranged on the skin surface side of the lower portion of the coating sheet so as to overlap with the opening of the absorbent core. The portion overlapping with the opening of the absorbent core, according to claim 1, wherein the folded portion of the first upper portion and / or said second upper portion is folded back to the skin surface side or non-skin side is provided Absorber. The absorber according to claim 2 , wherein the first upper portion and / or the second upper portion is folded back toward the skin surface side. Absorber according to claim 2 or 3 second upper portion front SL is folded back to the skin surface side or non-skin side. The folded portion and / or the folded portion of the second upper portion of the first upper portion, said absorbent the opening width direction of the claims are provided only on the inside of the width direction than both side edges of the core 2 The absorber according to any one of 4 to 4. The absorber according to any one of claims 1 to 5 , wherein the water-absorbent resin has an angle of repose of 45 ° or less. The absorber according to any one of claims 1 to 6 and
A liquid-permeable top sheet provided on the skin surface side of the absorber and
An absorbent article characterized by having a liquid-impermeable back sheet provided on the non-skin surface side of the absorbent body. The absorbent article according to claim 7 , wherein a protective sheet is provided between the absorbent body and the back sheet so as to overlap the opening of the absorbent core.

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