JP6910847B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article such as a urine pad (including a light incontinence pad) and a sanitary napkin, and more particularly to an absorbent article that can be attached to underwear such as pants and shorts. be.

Conventionally, an absorbent article having a main body portion on which an absorber is arranged and a wing portion extending outward in the width direction from the main body portion is known (for example, Patent Documents 1 to 3). An absorbent article having such a wing portion is usually used by folding the wing portion toward the outer surface side of the absorbent article and attaching it to underwear such as pants or shorts when the wing portion is attached.

Japanese Unexamined Patent Publication No. 2010-022539 Japanese Unexamined Patent Publication No. 2013-240435 Japanese Unexamined Patent Publication No. 2015-097716

It is desirable that the absorbent article has a good fit to the genital area of the wearer so that the urine or the like excreted from the wearer can be smoothly absorbed when the article is worn. However, it is desirable that the fit to the wearer's genital area is good when the absorbent article is attached to underwear such as pants or shorts. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorbent article that can be formed so as to have a good fit to the genital area of the wearer when the absorbent article is attached. It is in.

The absorbent article of the present invention that has been able to solve the above problems has a top sheet, a back sheet, and an absorber arranged between them, and has an anterior region, a posterior region, and these in the anterior-posterior direction. An absorbent article having a main body portion having an intermediate region located between them and a wing portion extending outward in the width direction from the intermediate region of the main body portion, and is a substrate between the back sheet and the absorber. A sheet is provided, and the substrate sheet is formed so that the intermediate region is narrower than the anterior region and the posterior region, and at least a part of the anterior region and at least a part of the posterior region is wider than the absorber. It is characterized in that it is formed narrower than the absorber in at least a part of the intermediate region.

Since the absorbent article of the present invention is provided with the substrate sheet formed as described above, when the wing portion is folded back to the outer surface side of the absorbent article in order to attach the absorbent article to underwear such as pants or shorts. , The wing portion is likely to be folded back toward the outer surface side of the absorbent article with the outer edge of the substrate sheet formed narrowly in the intermediate region as a fulcrum. At this time, since the force due to the folding is easily concentrated on the fulcrum, the main body portion is likely to be curved so as to bulge toward the skin surface side in the width direction cross section from the intermediate region to the front-rear direction. Therefore, it becomes easy to improve the fit to the genital area of the wearer when the absorbent article is worn, and it becomes easy to suitably absorb the urine or the like excreted from the wearer. Even if the absorbent article is folded along a crease extending in the width direction before use, for example, by unfolding the fold and folding the wing portion toward the outer surface side of the absorbent article, before and after straddling the crease. It becomes easy to form the main body portion in a curved shape so as to bulge toward the skin surface side in the cross section in the width direction in the direction. On the other hand, in the absorbent article, since it is not necessary to form the absorber in the intermediate region to be narrow in width in accordance with the substrate sheet, it is possible to secure the absorption capacity in the intermediate region.

The substrate sheet preferably has a higher basis weight than the top sheet and the back sheet. Further, the substrate sheet is preferably composed of a pulp fiber aggregate. By forming the substrate sheet in this way, when the wing portion is folded back toward the outer surface side of the absorbent article, the wing portion can be easily folded back with the outer edge of the substrate sheet as a fulcrum.

The portion of the substrate sheet that includes at least a part of the intermediate region and is formed narrower than the absorber is defined as the constricted portion, and the wing portion is located at half the length of the wing portion extending from the main body portion. When the virtual line extending in the front-back direction is the wing intermediate line, the front end of the constriction is located in front of the front end of the wing intermediate line, and the rear end of the constriction is from the rear end of the wing intermediate line. Is preferably located on the posterior side. When the substrate sheet is formed in this way, when the wing portion is folded back toward the outer surface side of the absorbent article, the force due to the folding back is easily transmitted to the outer edge of the substrate sheet at the constricted portion. Therefore, the wing portion can be easily folded back toward the outer surface side of the absorbent article with the outer edge of the substrate sheet as a fulcrum at the constricted portion, and the main body portion can be curved and formed so as to bulge toward the skin surface side in the width direction cross section at the constricted portion. It will be easier.

The narrowest portion of the substrate sheet formed in the constricted portion is preferably located in the front-rear region of the central portion obtained by dividing the wing middle line into three equal parts in the front-rear direction. If the constricted portion is formed in this way, when the wing portion is folded back to the outer surface side of the absorbent article, the force due to the folding back is easily transmitted to the narrowest portion of the substrate sheet formed in the constricted portion. , It becomes easy to form a curved body portion in a constricted portion so as to bulge toward the skin surface side in a cross section in the width direction.

The absorber preferably has both side edges in the width direction formed in a straight line. If the absorber is formed in such a shape, the wing portion is formed in a straight line when the wing portion is folded back to the outer surface side of the absorbent article and the absorbent article is fixed to underwear such as pants or shorts. By folding back along both side edges of the absorber, distortion of the absorbent article is suppressed, and the absorbent article can be stably fixed to the underwear.

The absorber is preferably configured to have a water-absorbent resin between the non-woven fabric sheets and not to have pulp fibers. Since the absorber configured in this way can be formed to be relatively thin, when the wing portion is folded back toward the outer surface side of the absorbent article, the wing portion can be easily folded back with the outer edge of the substrate sheet as a fulcrum. Become. Further, although it is thin, it can be an absorber having a high absorption capacity. In the absorbent body, it is preferable that the non-woven fabric sheet is made of a long-fiber non-woven fabric, and the constituent fibers of the non-woven fabric are oriented in the front-rear direction of the absorbent article. As a result, when the wing portion is folded back toward the outer surface side of the absorbent article, the main body portion tends to be curved so as to bulge toward the skin surface side in the width direction cross section from the intermediate region to the front side region and the rear side region.

When the absorbent article of the present invention is attached to underwear such as pants or shorts, the wing portion is folded back to the outer surface side of the absorbent article so that the main body portion is on the skin surface side in the width direction from the intermediate region to the front-rear direction thereof. It becomes easy to form a curve so as to bulge. Therefore, when the absorbent article is worn, it becomes easy to improve the fit to the genital area of the wearer, and it becomes easy to suitably absorb the urine or the like excreted from the wearer. Further, since it is not necessary to form the absorber in the intermediate region to have a narrow width in accordance with the substrate sheet, it is possible to secure the absorption capacity in the intermediate region.

A plan view of the absorbent article of the present invention as viewed from the skin surface side is shown. A plan view of the absorbent article shown in FIG. 1 as viewed from the outer surface side is shown. FIG. 2 shows an enlarged plan view of the wing portion of the absorbent article shown in FIG. The IV-IV cross-sectional view of the absorbent article shown in FIGS. 1 and 2 is shown.

The absorbent article of the present invention has a main body portion in which the absorber is arranged and a wing portion extending outward in the width direction from the main body portion, and the absorbent article is put into pants by using this wing portion. It can be used by attaching it to underwear such as shorts and shorts. Examples of the absorbent article of the present invention include a urine pad (including a light incontinence pad) and a sanitary napkin. Hereinafter, the absorbent article 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 to 4 show an example of the absorbent article of the present invention. FIG. 1 shows a plan view of the absorbent article as seen from the skin surface side, FIG. 2 shows a plan view of the absorbent article shown in FIG. 1 as viewed from the outer surface side, and FIG. 3 is shown in FIG. The enlarged plan view of the wing portion of the absorbent article is shown, and FIG. 4 shows an IV-IV cross-sectional view of the absorbent article shown in FIGS. 1 and 2. In the drawings, the arrow x represents the width direction, the arrow y represents the front-back direction, and the direction perpendicular to the surface formed by the arrows x and y represents the thickness direction z.

In the absorbent article, the anteroposterior direction y corresponds to the direction extending in the anteroposterior direction of the wearer's crotch when the absorbent article is worn, and the width direction x is on the same plane as the absorbent article and orthogonal to the anteroposterior direction. It means the direction in which the absorbent article is worn, and corresponds to the left-right direction of the wearer when the absorbent article is worn. The absorbent article also has a skin surface side and an outer surface side with respect to the thickness direction z. The skin surface side means the side facing the skin of the wearer when the absorbent article is worn, and the outer surface side means the side facing the wearer when the absorbent article is worn. The outer surface side of the absorbent article is a surface facing underwear such as pants and shorts (clothing facing surface) when the absorbent article is used, and for example, the outer surface side of the back sheet corresponds to the clothing facing surface.

The absorbent article 1 has a main body portion 2 in which the absorbent body 6 is arranged, and a wing portion 3 extending outward in the width direction x from the main body portion 2. The main body 2 is a portion that is applied to the crotch of the wearer when the absorbent article is worn, and functions to absorb urine or the like excreted from the wearer. The main body 2 is preferably formed in a shape long in the front-rear direction y, and is formed in, for example, a substantially rectangular shape, an oval shape, an hourglass shape, a battledore shape, or the like. The wing portion 3 is a portion extending outward in the width direction x from the main body portion 2, and when the absorbent article is attached, the wing portion 3 is folded back toward the outer surface side of the absorbent article to provide pants, shorts, or the like. Used to secure to underwear. The wing portion 3 extends from the main body portion 2 and is provided on one side and the other side of the width direction x of the main body portion 2, respectively. The absorbent article 1 is preferably formed to be the widest in the wing portion 3. In FIGS. 1 to 3, the boundary line between the main body portion 2 and the wing portion 3 is represented by a alternate long and short dash line.

The main body 2 has a front region F, a posterior region R, and an intermediate region M located between them in the front-rear direction y. The front region F includes the front end of the main body 2 and is formed so as to have a predetermined length in the front-rear direction y, and the rear region R includes the rear end of the main body 2 and is predetermined in the front-rear direction y. It is formed to have a length of. The intermediate region M is located between the anterior region F and the posterior region R, and is formed adjacent to the anterior region F and the posterior region R. The intermediate region M corresponds to a region in the range in the front-rear direction y extending from the main body portion 2 to the wing portion 3. The intermediate region M is preferably in the range of 20% to 80% when the front end is 0% and the rear end is 100% as the relative position of the absorbent article 1 in the front-rear direction y.

The wing portion 3 is defined as follows, for example, based on the outer edge shape of the absorbent article. When the absorbent article 1 is divided into a front half portion and a rear half portion in the front-rear direction y at a portion where the wing portion 3 extends to the outermost side in the width direction x, the outer edge of the absorbent article 1 is formed. The rearmost portion of the front half of the absorbent article 1 located inward in the width direction x corresponds to the front end of the base portion of the wing portion 3 (that is, the front end of the boundary line between the main body portion 2 and the wing portion 3). The outermost edge of the absorbent article 1 is located in the rear half of the absorbent article 1 in the innermost direction in the width direction x, and the frontmost portion is the rear end of the base of the wing portion 3 (that is, the main body portion 2). It corresponds to the rear end of the boundary line of the wing portion 3). However, the front end of the base portion of the wing portion 3 is not located at the front side edge of the absorbent article 1, and the rear end of the base portion of the wing portion 3 is not located at the rear side edge of the absorbent article 1. The main body 2 and the wing 3 are separated by a straight line connecting the front end of the base portion and the rear end of the base portion of the wing portion 3. At the front end of the base and the rear end of the base of the wing portion 3, the outer edge of the absorbent article 1 (or its tangent) extends parallel to the front-rear direction y, or the outer edge of the absorbent article 1 is convex inward in the width direction x. It is preferable that it is formed so as to be.

The wing portion 3 has a base front end and a base rear end in the range of 20% to 80% when the front end is 0% and the rear end is 100% as the relative position of the absorbent article 1 in the front-rear direction y. It is preferably located inside. The length of the wing portion 3 in the front-rear direction y (the length from the front end of the base to the rear end of the base in the front-rear direction y) is preferably 10% or more of the length of the absorbent article 1 in the front-rear direction y. 15% or more is more preferable, 50% or less is preferable, and 40% or less is more preferable.

The absorbent article 1 is a portion where the wing portion 3 extends to the outermost side in the width direction x, and the length of each wing portion 3 in the width direction x is 20% of the length of the main body portion 2 in the width direction x. It is preferably formed so as to be 60% or more, and more preferably 30% or more and 50% or less. The length of the wing portion 3 in the width direction x described here means the length of the wing portion 3 extending from the main body portion 2. Further, in the present invention, in the wing portion 3, a virtual line extending in the front-rear direction y through a point of half the length of the wing portion 3 extending from the main body portion 2 (two-dot chain line with reference numeral 13 in FIG. 3). Is referred to as a "wing midline".

The main body 2 has a top sheet 4 and a back sheet 5, and an absorber 6 is arranged between them. The top sheet 4 is a sheet located on the wearer side when the absorbent article is used, and is arranged on the skin surface side of the absorbent body 6. The top sheet 4 is preferably liquid permeable. The back sheet 5 is a sheet located on the side opposite to the wearer when the absorbent article is used, and is arranged on the outer surface side of the absorbent body 6. The back sheet 5 is preferably liquid impermeable. The urine or the like excreted from the wearer passes through the top sheet 4 and is housed by the absorber 6, and the back sheet 5 prevents the excrement from leaking to the outside.

Examples of the liquid-permeable top sheet include non-woven fabrics formed from hydrophilic fibers such as cellulose, rayon, and cotton, and polyolefins (for example, polypropylene and polyethylene), polyesters (for example, PET), and polyamides (for example, nylon). It is possible to use a non-woven fabric formed of the hydrophobic fibers such as the above, in which the surface of the hydrophobic fibers is hydrophilized by a surfactant or the like. Further, as the top sheet, a woven cloth, a knitted cloth, a perforated plastic film or the like may be used.

As the liquid-impermeable back sheet, a non-woven fabric formed of hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, nylon), a plastic film, or the like is used. Can be done. The back sheet may be composed of a laminate of two or more sheets, and for example, a laminate of a non-woven fabric and a plastic film may be used. In this case, at least one sheet constituting the laminated body may be liquid-impermeable, and the sheets constituting the laminated body may have the same size or different sizes. Liquid impermeable also includes the meaning of water repellency.

The absorber is not particularly limited as long as it contains an absorbent material capable of absorbing excrement such as urine. As the absorber, for example, a molded body obtained by molding an absorbent material into a predetermined shape can be used. The absorber may be covered with a covering sheet such as a paper sheet (for example, tissue paper or thin paper) or a liquid permeable non-woven fabric. Examples of the absorbent material include hydrophilic fibers such as pulp fibers and water-absorbent resins such as polyacrylic acid-based, polyaspartic acid-based, cellulosic-based, and starch / acrylonitrile-based. Further, the water-absorbent material may include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and heat-sealing fibers such as polyamide fibers. These heat-sealing fibers may be hydrophilized with a surfactant or the like in order to enhance the affinity with urine or the like. The absorbent material preferably contains at least a water-absorbent resin from the viewpoint of increasing the absorption capacity.

The absorber may be a sheet-like absorber. Examples of the sheet-shaped absorber include those formed so as to have a water-absorbent resin between the non-woven fabric sheets and not to have pulp fibers. Since the sheet-shaped absorber thus formed has a water-absorbent resin between the non-woven fabric sheets, a high absorption capacity can be realized, and since there are no pulp fibers between the non-woven fabric sheets, it can be formed thin without being bulky. can.

The sheet-shaped absorber may use a water-absorbent fiber as an absorbent material. Also in this case, the sheet-like absorber is formed thin without being bulky. Examples of the water-absorbent fiber include fibers containing a protonated or salt-formed carboxyl group. For example, a water-absorbent fiber can be obtained by hydrolyzing an acrylic fiber to convert a nitrile group contained in the acrylic fiber into a carboxyl group. At this time, it is preferable that the carboxyl group contained in the water-absorbent fiber forms an alkali metal salt or an ammonia salt. Further, the water-absorbent fiber can be produced by immersing the hydrophilic fiber in acrylic acid and precipitating acrylic acid on the fiber surface.

The shape (planar shape) of the absorber 6 is not particularly limited. Examples of the shape of the absorber 6 include a substantially rectangular shape, an oval shape, an hourglass shape, a battledore shape, and the like.

It is preferable that the absorbent article 1 is provided with rising flaps 10 on both sides of the top sheet 4 in the width direction x (see FIG. 4). By providing the rising flap 10, lateral leakage of urine or the like is prevented. The rising flap 10 is provided with, for example, side sheets 9 extending in the front-rear direction y on both sides of the width direction x of the top sheet 4, and the side sheets 9 are provided at the side joints 12 so that free ends are formed. It can be formed by providing an elastic member 11 on the free end side of the side sheet 9 with respect to the side joint portion 12. By providing the side seat 9 and the elastic member 11 in this way, the inner portion of the side seat 9 in the width direction x rises toward the wearer's skin due to the contraction force of the elastic member 11, and the rising flap 10 is formed. .. In the absorbent article 1 shown in the drawing, the rising flap 10 is free to stand up from the top sheet 4 by tilting outward in the width direction x and rising from the outer end of the standing base portion in the width direction x. It is formed so as to have an upright end portion extending inward in the width direction x on the end side. 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 wing portion 3 is formed such that a sheet (for example, at least one selected from a top sheet, a back sheet, and a side sheet) constituting the main body portion 2 extends from the main body portion 2, or the main body portion 2 is used for a wing portion. It is formed by attaching a sheet. The wing seat can be composed of a seat applicable to a top seat and a back seat. It is preferable that no absorber is arranged in the wing portion 3.

It is preferable that an adhesive portion is provided on the outer surface side of the absorbent article 1 (not shown). The adhesive portion may be provided on the outer surface side of the main body portion 2, may be provided on the outer surface side of the wing portion 3, or may be provided on both of them. By providing the adhesive portion on the outer surface side of the absorbent article 1, when the absorbent article is used, the absorbent article can be fixed to underwear such as pants or shorts by the adhesive portion.

The main body 2 is provided with a substrate sheet 7 between the back sheet 5 and the absorber 6. The substrate sheet 7 is provided to prevent the absorbent article 1 (particularly the main body 2) from losing its shape. The substrate sheet 7 can be made of a non-woven fabric, paper (for example, tissue paper or thin paper), and may be liquid-permeable or liquid-impermeable. It is preferable that the substrate sheet 7 is provided only on the outer surface side of the absorber 6 and is not formed so as to cover the side surface or the skin surface side of the absorber 6, for example.

It is preferable that the entire outer edge of the substrate sheet 7 is located inside the outer edge of the main body 2. Therefore, it is preferable that the substrate sheet 7 does not exist in the wing portion 3. Further, the outer edge of the substrate sheet 7 is preferably located near the outer edge of the main body portion 2. For example, in at least the front side region F and the rear side region R, the outer edge of the substrate sheet 7 is within 25 mm from the outer edge of the main body portion 2 ( It is more preferably within 20 mm, still more preferably within 15 mm). The outer edge of the substrate sheet 7 is preferably in such a range in the entire front side region F and the rear side region R.

In the substrate sheet 7, the intermediate region M is formed to be narrower than the front region F and the rear region R, and at least a part of the front region F and at least a part of the rear region R are wider than the absorber 6. Is formed in, and is formed narrower than the absorber 6 in at least a part of the intermediate region M. Since the substrate sheet 7 is formed in the absorbent article 1 in this way, when the absorbent article is attached to underwear such as pants or shorts, the wing portion 3 is folded back toward the outer surface side of the absorbent article to form the main body portion. 2 is easily deformed so as to be curved toward the skin surface side in the width direction cross section from the intermediate region M to the front-rear direction y thereof. Explaining this in detail, when the absorbent article 1 provided with the substrate sheet 7 formed as described above is grasped by the wing portion 3 and folded back toward the outer surface side of the absorbent article, the wing portion 3 is formed in the intermediate region M. With the outer edge of the narrowly formed substrate sheet 7 as a fulcrum, it is easy to be folded back toward the outer surface side of the absorbent article. At this time, the force due to the folding back tends to be concentrated on the fulcrum, while the substrate sheet 7 and the absorber 6 overlap each other between the fulcrums (between the fulcrums on one side and the other side in the width direction x), which is relatively large. Since the rigidity is formed to be high, the intermediate region M (particularly the portion where the substrate sheet 7 and the absorber 6 overlap) of the main body 2 is likely to be curved so as to bulge toward the skin surface side in the cross section in the width direction x. In the absorbent article 1, the wing portion 3 is folded back along the outer edge of the substrate sheet 7 in the width direction x, so that the main body portion 2 has a cross section in the width direction from the intermediate region M to the front region F and the rear region R in this way. It becomes easy to form a curve so as to swell toward the skin surface side. Therefore, it becomes easy to improve the fit to the genital area of the wearer when the absorbent article is worn, and it becomes easy to suitably absorb the urine or the like excreted from the wearer. Even when the absorbent article 1 is folded along a crease extending in the width direction x before use, the fold is formed by unfolding the fold and folding the wing portion 3 toward the outer surface side of the absorbent article. It becomes easy to form the main body portion 2 so as to bulge toward the skin surface side in the cross section in the width direction in the front-rear direction across the straddle.

The absorbent article 1 can also secure the absorption capacity in the intermediate region M of the main body 2 by being configured as described above. Since the intermediate region M of the main body 2 is located in or near the wearer's genital area when the absorbent article is attached, the intermediate region M is used from the viewpoint of preventing leakage of urine and the like to realize rapid absorption. It is desirable that the absorption capacity of urine is secured as much as possible. In this respect, since it is not necessary for the absorbent article 1 to form the absorber 6 in the intermediate region M so as to be narrow in width in accordance with the substrate sheet 7, it is possible to secure the absorption capacity in the intermediate region M. On the other hand, in the front side region F and the rear side region R of the main body portion 2, the substrate sheet 7 is formed wider than the absorber 6, so that the absorbent article 1 can be easily maintained in a desired shape. Further, if the substrate sheet 7 is formed wider than the absorber 6 in the front side region F and the rear side region R, the wing portion 3 becomes the substrate sheet when the wing portion 3 is folded back to the outer surface side of the absorbent article. Even when folded back along the outer edge of the absorber 6 in the intermediate region M instead of the outer edge of 7, the same effect as described above is likely to be obtained. That is, the intermediate region M of the main body 2 is likely to be curved so as to bulge toward the skin surface in the cross section in the width direction.

At least a part of the intermediate region M of the substrate sheet 7 may be formed narrower than the front region F and the rear region R. Specifically, in the substrate sheet 7, the intermediate region M is not formed wider than the front region F and the posterior region R, and the intermediate region M is larger than the maximum width of the front region F and the maximum width of the posterior region R. It suffices if a narrow portion is formed. Preferably, the entire intermediate region M of the substrate sheet 7 is formed to be narrower than the maximum width of the front side region F and the maximum width of the rear side region R. At this time, the substrate sheet 7 extends from the portion having the maximum width of the front side region F to the portion having the minimum width of the intermediate region M, and from the portion having the maximum width of the rear side region R to the portion having the minimum width of the intermediate region M. It is preferable that the length in the width direction x is gradually reduced. The mode in which the length in the width direction x gradually decreases includes a mode in which the length in the width direction x continuously decreases and a portion in which the length in the width direction x becomes constant in the front-rear direction y. Aspects are included.

The substrate sheet 7 is formed to be wider than the absorber 6 in at least a part of the front side region F and at least a part of the rear side region R, and narrower than the absorber 6 in at least a part of the intermediate region M. ing. That is, in the main body portion 2, at least a part of the front side region F and at least a part of the rear side region R, the substrate sheet 7 extends outward in the width direction x from the absorber 6, and the intermediate region M In at least a part of the above, the absorber 6 extends outward in the width direction x from the substrate sheet 7. Therefore, the main body 2 has a portion on both sides in the width direction x where the outer edge of the substrate sheet 7 intersects the outer edge of the absorber 6 from the front side region F to the intermediate region M, and the substrate sheet from the rear side region R to the intermediate region M. There will be a portion where the outer edge of 7 intersects with the outer edge of the absorber 6. Preferably, the substrate sheet 7 is formed narrower than the absorber 6 including at least a part of the intermediate region M, and the entire front side and the rear side thereof are formed wider than the absorber 6.

The length of the portion of the substrate sheet 7 formed to be narrower than that of the absorber 6 in the front-rear direction y is preferably 15% or more, more preferably 20% or more, more preferably 25% or more of the length y in the front-rear direction of the absorber 6. % Or more is more preferable, 70% or less is preferable, 60% or less is more preferable, and 50% or less is further preferable. The length of the front-rear direction y described here means the length of the portion of the substrate sheet 7 including at least a part of the intermediate region M and formed narrower than the absorber 6 in the front-rear direction. However, in the present invention, the portion (the portion marked with reference numeral 8 in FIG. 3) is referred to as a “necked portion”.

As shown in FIG. 3, in the constricted portion 8, the front end 8E _F is located on the front side of _{the front end 13E F} of the wing intermediate line 13, _{and the rear end 8E R} is the rear end 13E of the wing intermediate line 13. It is preferably located posterior to _R. When the constricted portion 8 is formed in this way, when the wing portion 3 is folded back toward the outer surface side of the absorbent article, the force due to the folded back portion is easily transmitted to the outer edge of the substrate sheet 7 of the constricted portion 8. Therefore, the wing portion 3 is easily folded back toward the outer surface side of the absorbent article with the outer edge of the substrate sheet 7 as a fulcrum at the constricted portion 8, and the main body portion 2 is bulged toward the skin surface side in the width direction cross section at the constricted portion 8. It becomes easy to form a curve.

The minimum width of the substrate sheet 7 in the constricted portion 8 is preferably 65% or more, more preferably 75% or more, further preferably 80% or more, and 95% or less of the length x in the width direction of the absorber 6 in the portion. Is preferable, 92% or less is more preferable, and 90% or less is further preferable.

The narrowest portion of the constricted portion 8 where the substrate sheet 7 is formed is a region in the front-rear direction y of the central portion obtained by dividing the wing intermediate line 13 into three equal parts in the front-rear direction y (the region indicated by diagonal hatching in FIG. 3). It is preferably located at 14). If the constricted portion 8 is formed in this way, when the wing portion 3 is folded back toward the outer surface side of the absorbent article, the force due to the folding back is applied to the portion where the substrate sheet 7 is formed to be the narrowest in the constricted portion 8. It becomes easy to form the main body portion 2 in the constricted portion 8 so as to bulge toward the skin surface side in the cross section in the width direction. More preferably, the narrowest portion of the substrate sheet 7 formed in the constricted portion 8 is a front portion and a rear portion (that is, a portion on the front side of the central portion) obtained by dividing the wing intermediate line 13 into three equal parts in the front-rear direction y. And the posterior part) does not exist in the region y in the anterior-posterior direction.

In the constricted portion 8, the outer edge of the substrate sheet 7 is preferably formed in a curved shape that is convex inward in the width direction x. When the outer edge of the substrate sheet 7 is formed in this way, when the wing portion 3 is folded back toward the outer surface side of the absorbent article, the main body portion 2 in the constricted portion 8 bulges toward the skin surface side in the width direction cross section. In addition to being easily curved, the bulge of the main body 2 toward the skin surface is naturally reduced from the constricted portion 8 (particularly the portion where the substrate sheet 7 is formed to be the narrowest in the width direction x) to the front side and the rear side. It becomes easy to be formed so as to. Therefore, it becomes easy to improve the fit when the absorbent article is attached.

It is preferable that the substrate sheet 7 extends forward of the anterior edge of the absorber 6 and extends posteriorly of the posterior edge of the absorber 6. If the main body 2 is formed in this way, the shape retention at both ends of the main body 2 in the front-rear direction y is ensured, and the absorber 6 is located near the front end and the rear end of the main body 2. By forming the non-existent portion of the absorbent article, when the absorbent article is removed from the wearer's underwear, the absorbent article can be removed from the underwear without touching the existing portion of the absorber 6. The length of the absorber 6 in the front-rear direction y is, for example, preferably 60% or more, more preferably 65% or more, further preferably 70% or more, and 95% or less of the length of the substrate sheet 7 in the front-rear direction. Preferably, 90% or less is more preferable, and 85% or less is further preferable.

The substrate sheet 7 is preferably formed so as to have a certain degree of rigidity, and from such a viewpoint, the substrate sheet 7 is preferably composed of a pulp fiber aggregate. By forming the substrate sheet 7 in this way, when the wing portion 3 is folded back toward the outer surface side of the absorbent article, the wing portion 3 can be easily folded back with the outer edge of the substrate sheet 7 as a fulcrum. The pulp fiber aggregate is preferably an aggregate of pulp short fibers, and more preferably an aggregate in which pulp short fibers are randomly oriented. When the substrate sheet 7 is formed in this way, the rigidity of the substrate sheet 7 can be increased in all directions in the plane direction.

The substrate sheet 7 preferably has a higher basis weight (mass per unit area) than the top sheet 4 and the back sheet 5. By forming the substrate sheet 7 in this way, the wing portion 3 can be easily folded back with the outer edge of the substrate sheet 7 as a fulcrum. Basis weight of the substrate sheet 7, for example, 25 g / m ² or more preferably, 28 g / m ² or more preferably, 32 g / m ² or more is more preferable. On the other hand, the upper limit of the basis weight of the substrate sheet 7 is not particularly limited, but the basis weight of the substrate sheet 7 ^{is preferably 60 g / m 2} or less, preferably 50 g, from the viewpoint of forming the thickness of the absorbent article 1 thin and improving the wearing feeling. / M ² or less is more preferable, and 45 g / m ² or less is further preferable.

The substrate sheet 7 is preferably bonded to the back sheet 5 with an adhesive. At this time, the amount of adhesive applied per unit area of the regions on both sides obtained by dividing the substrate sheet 7 into three equal parts in the width direction x is preferably larger than the amount of adhesive applied per unit area of the central region. If the adhesive is applied in this way, the rigidity of the outer edge of the substrate sheet 7 in the width direction x tends to increase, and when the wing portion 3 is folded back toward the outer surface side of the absorbent article, the outer edge of the substrate sheet 7 is squeezed. It becomes easy to turn back as a fulcrum. The adhesive coating amount described here means the average value of the adhesive coating amount per unit area in each region. At this time, it is preferable that the adhesive is applied in a pattern such as a net shape, a linear shape, or a scattered spot shape. For example, when the adhesive is applied in a linear adhesive pattern, the linear adhesive pattern may be linear or curved (for example, meandering linear or spiral). It may be a combination of.

The absorber 6 is preferably formed to be relatively thin. By forming the absorbent body 6 to be thin, when the wing portion 3 is folded back toward the outer surface side of the absorbent article, the wing portion 3 can be easily folded back with the outer edge of the substrate sheet 7 as a fulcrum. The thickness of the absorber 6 is, for example, preferably 5 mm or less, more preferably 4 mm or less, and even more preferably 3 mm or less. The thickness of the absorber described here means the thickness of the thickest portion of the absorber 6. A plurality of absorbers may be laminated, and in this case, the thickness of the entire absorber composed of the plurality of layers is the thickness of the absorber. The thickness of the absorber 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 absorber 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.

As the absorber formed to be thin, it is preferable to use the sheet-shaped absorber described above. In particular, if a sheet-like absorber having a water-absorbent resin between the non-woven fabric sheets and not having pulp fibers is used, it is possible to have a high absorption capacity even though it is thin. ,preferable. In the sheet-shaped absorber, the presence of pulp fibers inevitably mixed in during production is allowed.

The non-woven fabric sheet is preferably made of a non-woven fabric in which the constituent fibers are oriented in the front-rear direction y. If the non-woven fabric sheet is formed of such a non-woven fabric, when the wing portion 3 is folded back toward the outer surface side of the absorbent article, the main body portion 2 has a cross section in the width direction from the intermediate region M to the front side region F and the rear side region R. It becomes easy to form a curve so as to swell toward the skin surface side. More preferably, the non-woven fabric sheet is composed of a long-fiber non-woven fabric, and the constituent fibers of the non-woven fabric are oriented in the front-rear direction y of the absorbent article.

Examples of the non-woven fabric in which the constituent fibers are oriented in one direction include a spunbonded non-woven fabric, an air-through non-woven fabric, a spunlaced non-woven fabric, and the like. Among them, the non-woven fabric sheet is preferably composed of a spunbonded non-woven fabric which is a long-fiber non-woven fabric. The orientation direction of the constituent fibers of the non-woven fabric can be confirmed by observing the surface of the non-woven fabric with a microscope or the like. For example, in the spunbonded non-woven fabric, the orientation direction of the constituent fibers is explained as follows. The spunbonded non-woven fabric can be obtained, for example, by melting a polymer raw material, extruding it from a spinneret, stretching it, accumulating it on a conveyor belt or the like, and forming it into a web shape. The webs (fibers) accumulated in the conveyor belt will be arranged along the traveling direction of the conveyor belt. Therefore, in this case, the web (fiber) is oriented along the traveling direction (MD direction) of the conveyor belt. In the air-through non-woven fabric, the orientation direction of the constituent fibers can be aligned by appropriately setting the method of accumulating the raw material short fibers at the time of forming the fiber mass and the method of opening the fibers at the time of forming the web in producing the non-woven fabric. In the spunlace non-woven fabric, when the non-woven fabric is formed, the orientation direction of the constituent fibers can be aligned by controlling the flow of the water flow in which the short fibers are dispersed and depositing the fibers.

In the sheet-like absorber, it is preferable that the non-woven fabric sheets are joined to each other (that is, the non-woven fabric sheet located on the skin surface side and the non-woven fabric sheet located on the outer surface side are joined to form a sealing portion). .. In this case, it is preferable that a water-absorbent resin is arranged in the non-sealed portion where the non-woven fabric sheets are not bonded to each other to form an absorption region. The sealing portion is formed by joining non-woven fabric sheets with an adhesive or welding (heat sealing or ultrasonic welding). The sealing portion is defined as a portion where the non-woven fabric sheets are joined to each other, and the presence of the water-absorbent resin in the sealing portion is allowed. When the sealing portion is formed in this way, the sealing portion functions as a diffusion passage for urine or the like, and urine or the like received by the absorber can easily diffuse through the sealing portion. As a result, urine and the like are rapidly absorbed by the absorber, and the water-absorbing ability of the water-absorbent resin can be easily utilized over a wide range.

The sealing portion is preferably arranged in a stripe shape extending in the front-rear direction y. Specifically, it is preferable that three or more sealing portions are provided side by side in the width direction x so as to extend in the front-rear direction y. If the sealing portion is formed in this way, when the wing portion 3 is folded back to the outer surface side of the absorbent article, the main body portion 2 extends from the intermediate region M to the front region F and the rear region R in the width direction cross section. It tends to be curved so as to bulge toward the skin surface. Further, since urine or the like easily diffuses the absorber in the front-rear direction y through the sealing portion, more of the water-absorbent resin arranged on the absorber 6 easily contributes to the absorption of urine or the like, and the absorber The absorption capacity of 6 can be enhanced.

In the sheet-shaped absorber, the water-absorbent resin is preferably fixed to the non-woven fabric sheet with an adhesive. That is, it is preferable that the non-woven fabric sheet is coated with an adhesive to provide an adhesive layer, and the water-absorbent resin is fixed to the non-woven fabric sheet by the adhesive layer. The adhesive layer may be provided on at least one of the non-woven fabric sheet arranged on the skin surface side and the non-woven fabric sheet arranged on the outer surface side, but preferably, the adhesive layer is provided on both non-woven fabric sheets. At least a part of the water-absorbent resin may be fixed to the adhesive layer. For example, the water-absorbent resin in contact with the adhesive layer may be fixed to the adhesive layer. If the water-absorbent resin is fixed to the non-woven fabric sheet by the adhesive layer, it becomes difficult for the water-absorbent resin to move between the non-woven fabric sheets before the water-absorbent resin absorbs water, and the absorption capacity of urine and the like in the absorber 6 is secured. It becomes easy to be done. Even after the water-absorbent resin has absorbed water, the gelled water-absorbent resin is less likely to move between the non-woven fabric sheets, and as a result, the water-absorbent resin becomes lumpy and less likely to give the wearer a sense of discomfort.

The adhesive layer preferably fixes the water-absorbent resin and does not inhibit water absorption or swelling by the water-absorbent resin. From this point, the adhesive layer is preferably provided in an intermittent pattern, for example, the adhesive layer is applied with the adhesive in a net-like or curved (for example, meandering linear or spiral) pattern. It is preferably formed by. Examples of the method of applying the adhesive in such a pattern include a curtain spray method, a spiral coating method, an omega coating method, and the like.

The absorber 6 preferably has both side edges in the width direction x formed in a straight line. If the absorber 6 is formed in such a shape, when the wing portion 3 is folded back toward the outer surface side of the absorbent article and the absorbent article is fixed to underwear such as pants or shorts, the wing portion 3 becomes linear. By folding back the formed absorber 6 along both side edges in the width direction x, distortion of the absorbent article is suppressed, and the absorbent article can be stably fixed to the underwear.

When the rising flap 10 is provided on the main body 2, the outer edge of the substrate sheet 7 in the width direction x is at a position overlapping the rising flap 10 in a state where the rising flap 10 is laid down in at least a part of the intermediate region M. Is preferable. The state in which the rising flap 10 is laid down means a state in which the rising flap 10 is vertically stacked on the surface of the main body 2 on the skin surface side, and as shown in FIG. 4, the rising flap 10 is in a standing state. When it is formed by being folded back, the rising flap 10 is vertically stacked on the surface of the main body 2 on the skin surface side in a folded state, and is in a state of lying down. If the rising flap 10 is formed in this way, the wing portion 3 is folded back toward the outer surface side of the absorbent article when the absorbent article is attached, so that the rising flap 10 can be naturally formed in an upright state. Preferably, the outer edge of the substrate sheet 7 is positioned so as to overlap the rising flap 10 with the rising flap 10 lying down over the entire intermediate region M. Further, the outer edge of the substrate sheet 7 may be located at a position where the rising flap 10 overlaps with the rising flap 10 in a state where the rising flap 10 is laid down over the entire region in the front-rear direction y where the absorber 6 exists.

As shown in FIG. 4, when the rising flap 10 is formed so as to tilt outward in the width direction x and rise from the top sheet 4, the portion where the rising flap 10 rises from the top sheet 4 is in the width direction x. It is preferable that the substrate sheet 7 is in a position where it overlaps with the outer edge of the substrate sheet 7 in the width direction x at least in a part of the intermediate region M in a state of being laid down outward. Further, although not shown in the drawing, when the rising flap 10 is formed so as to tilt inward in the width direction x and rise, the portion where the rising flap 10 rises from the top sheet 4 is in the width direction x. It is preferable that the substrate sheet 7 is in a position where it overlaps with the outer edge of the substrate sheet 7 in the width direction x in at least a part of the intermediate region M in a state of being laid down inward. When the rising flap 10 is formed so as to tilt outward in the width direction x and stand up, the rising flap 10 has the end region of the outer surface in the width direction x in the front-rear direction y on the side sheet 9. It is preferable that they are joined. When the rising flap 10 is formed so as to tilt inward in the width direction x and stand up, the rising flap 10 is joined to the top sheet 4 at the end region of the inner surface surface in the width direction x in the front-rear direction y. Is preferable.

1: Absorbent article 2: Body part 3: Wing part 4: Top sheet 5: Back sheet 6: Absorber 7: Substrate sheet 8: Constriction part 13: Wing middle line

Claims (8)

A main body having a top sheet, a back sheet, and an absorber arranged between them, and having an anterior region, a posterior region, and an intermediate region located between them in the front-rear direction.
An absorbent article having a wing portion extending outward in the width direction from the intermediate region of the main body portion.
A substrate sheet having a basis weight of 25 g / m ² or more is provided between the back sheet and the absorber.
In the substrate sheet, the intermediate region is formed to be narrower than the front region and the rear region, and at least a part of the front region and at least a part of the rear region are wider than the absorber. An absorbent article, which is formed in a narrower width than the absorber in at least a part of the intermediate region. The absorbent article according to claim 1, wherein the substrate sheet has a higher basis weight than the top sheet and the back sheet. The absorbent article according to claim 1 or 2, wherein the substrate sheet is composed of an aggregate of pulp fibers. A portion of the substrate sheet that includes at least a part of the intermediate region and is formed narrower than the absorber is defined as a constricted portion.
In the wing portion, when a virtual line extending in the front-rear direction through a point where the wing portion extends at half the length extending from the main body portion is defined as a wing intermediate line.
The front end of the constriction is located in front of the front end of the wing midline.
The absorbent article according to any one of claims 1 to 3, wherein the rear end of the constriction portion is located on the rear side of the rear end of the wing intermediate line. A portion of the substrate sheet that includes at least a part of the intermediate region and is formed narrower than the absorber is defined as a constricted portion.
In the wing portion, when a virtual line extending in the front-rear direction through a point where the wing portion extends at half the length extending from the main body portion is defined as a wing intermediate line.
Any one of claims 1 to 4, wherein a portion in which the substrate sheet is formed to be the narrowest in the constricted portion is located in a region in the front-rear direction of a central portion obtained by dividing the wing intermediate line into three equal parts in the front-rear direction. Absorbent article described in. The absorbent article according to any one of claims 1 to 5, wherein the absorber has both side edges in the width direction formed in a straight line. The absorbent article according to any one of claims 1 to 6, wherein the absorbent body has a water-absorbent resin between the non-woven fabric sheets and does not have pulp fibers. The absorbent article according to claim 7, wherein the nonwoven fabric sheet is made of a long-fiber nonwoven fabric, and the constituent fibers of the nonwoven fabric are oriented in the front-rear direction of the absorbent article.

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