TWI826699B - absorbent articles - Google Patents

Abstract

An object of the present invention is to provide an absorbent article that can suppress gel clogging and easily and continuously absorb body fluids. The absorbent article (1) has: a liquid-permeable surface sheet (10); a liquid-impermeable back sheet (20); and is arranged between the surface sheet and the back sheet and has at least hydrophilic fibers and highly absorbent polymers. The absorber of things (30). The absorbent body (30) includes: an upper absorbent body (35) having at least hydrophilic fibers; and a lower absorbent body (36) disposed closer to the non-skin-facing side than the upper absorbent body. The lower absorbent system has an extended region (R10) that extends further in the length and width directions than the upper absorbent body. The basis weight of the super-absorbent polymer (32) exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the super-absorbent polymer (32) exposed on the skin-facing surface in the extended area.

Description

absorbent articles

The present invention relates to absorbent articles such as panty liners and mild incontinence pads that are worn on underwear and used.

In the past, absorbent articles were used to be worn on close-fitting clothing and absorb body fluids such as secretions, sweat, and urine. The absorbent article of Patent Document 1 has a surface sheet, a back sheet, and an absorbent core material containing a highly absorbent polymer disposed between the surface sheet and the back sheet. The absorbent core material in Patent Document 1 is mainly composed of a super-absorbent polymer, and the super-absorbent polymer is arranged over the entire plane of the absorbent core material. [Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2012-105962

The absorbent core material of Patent Document 1 is mainly composed of a superabsorbent polymer and has excellent retention of body fluids. However, since the super-absorbent polymer is disposed over the entire planar area of the absorbent core material, once it absorbs body fluids, the super-absorbent polymer will gel and easily cause gel clogging. If gel clogging occurs, it becomes difficult to continuously absorb body fluids, leakage may occur, or the wearing feel may deteriorate due to body fluids remaining on the surface.

Therefore, there is a demand for absorbent articles that can suppress gel clogging and easily absorb body fluids continuously.

An absorbent article according to one aspect of the present invention has: a longitudinal direction and a width direction that are orthogonal to each other; a liquid-permeable surface sheet; a liquid-impermeable back sheet; and is disposed between the surface sheet and the back sheet. Between them, the absorbent body has at least hydrophilic fibers and super absorbent polymers. The absorbent system includes: an upper absorbent body having at least the hydrophilic fibers; and a lower absorbent body disposed closer to the non-skin-facing side than the upper absorbent body. The lower absorbent system has an extended area extending further in the longitudinal direction and the width direction than the upper absorbent body. The basis weight of the super-absorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the super-absorbent polymer exposed on the skin-facing surface of the extended region.

(1) Summary of implementation form

Based on the descriptions in this manual and the drawings, at least the following matters can be made clearer. An absorbent article according to one aspect of the present invention has: a longitudinal direction and a width direction that are orthogonal to each other; a liquid-permeable surface sheet; a liquid-impermeable back sheet; and is disposed between the surface sheet and the back sheet. Between them, the absorbent body has at least hydrophilic fibers and super absorbent polymers. The absorbent system includes: an upper absorbent body having at least the hydrophilic fibers; and a lower absorbent body disposed closer to the non-skin-facing side than the upper absorbent body. The lower absorbent system has an extended area extending further in the longitudinal direction and the width direction than the upper absorbent body. The basis weight of the super-absorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the super-absorbent polymer exposed on the skin-facing surface of the extended region. According to this aspect, the upper absorbent system has hydrophilic fibers, and the hydrophilic fibers can quickly absorb body fluids. The body fluid sucked into the upper absorbent body is guided to the lower absorbent body while spreading in the upper absorbent body. At this time, since the basis weight of the superabsorbent polymer exposed on the skin-facing side of the upper absorbent body is less, gel clogging on the skin-facing side of the upper absorbing body can be suppressed, and body fluids can be continuously sucked into the skin. The upper layer is absorbed into the body. In addition, the superabsorbent polymer in the extended area of the lower absorbent body has a large basis weight, and body fluids that leak out from the upper absorbent body to the sides are retained by the superabsorbent polymer in the extended area, thereby suppressing lateral leakage. The extended area is offset to the outside from the center of the absorbent article for body fluid discharge. Therefore, body fluids can continue to be retained even if gel clogging occurs due to the extended area of superabsorbent polymer.

According to an ideal aspect, the aforementioned upper absorbent system is an air-laid nonwoven fabric containing the aforementioned hydrophilic fiber and the aforementioned highly absorbent polymer. Air-laid nonwoven fabrics have high liquid suction properties and high release properties of sucked liquids. Therefore, the upper absorbent body can quickly absorb the discharged body fluids, and the lower absorbent body can quickly guide the body fluids. In addition, since the air-laid nonwoven fabric has high diffusivity in the plane direction, the body fluids sucked into the upper absorbent body can be diffused over a wide range. Therefore, body fluids can be retained in the wide area of the upper absorbent body, and body fluids can be easily guided to the extended area of the lower absorbent body. Therefore, gel clogging caused by local absorption of body fluids in the upper absorbent body can be suppressed.

According to an ideal aspect, in the upper absorbent body, the hydrophilic fiber is disposed at least on the surface of the lower absorbent body, and the superabsorbent polymer is disposed on at least a surface more disposed on the lower absorbent body side. The aforementioned hydrophilic fibers are closer to the side opposite to the skin. According to this aspect, the body fluids that cannot be completely absorbed by the super-absorbent polymer in the upper absorbent body can be absorbed by the hydrophilic fiber with the super-absorbent polymer located closer to the non-skin-facing side. By sucking body fluids into the upper absorbent body toward the non-skin-facing side, the body fluids can be smoothly guided toward the lower absorbent body.

According to an ideal aspect, the absorbent body has heat-fusible fibers, and the heat-fusible fibers are disposed only in the lower absorbent body among the upper absorbent body and the lower absorbent body. The thermally fusible fiber is heated during the manufacturing process to form a thermally fusible portion. By forming a thermal fusion zone in the lower absorbent body, the bonding force between fibers becomes stronger and the lower absorbent body becomes less likely to twist. Thereby, the absorbent article as a whole becomes less likely to twist, can be continuously positioned appropriately facing the body, and can suppress leakage and the occurrence of discomfort. In addition, since the heat-fusible fiber is not arranged in the upper absorbent body, no heat-fusible portion is formed in the upper absorbent body. The expansion of the super-absorbent polymer will not be hindered due to the stronger bonding force between fibers, and the super-absorbent polymer will easily expand and the absorption performance can be maintained.

According to an ideal aspect, the extension area includes a first area arranged on the upper absorbent body side and a second area arranged on the outer edge side of the absorbent article, and the first area is exposed to the skin. The basis weight of the superabsorbent polymer on the opposite side is greater than the basis weight of the superabsorbent polymer on the side opposite to the skin in the second region. According to this aspect, since the basis weight of the superabsorbent polymer in the first region is relatively large, body fluids can be further retained in the first region located inside the absorbent article in a plan view. It becomes difficult for body fluids to reach the outer edge of the absorbent article, and lateral leakage can be suppressed.

According to an ideal aspect, there is also an absorbing joint portion provided with an adhesive material for joining the upper absorbent body and the lower absorbent body, and the absorbing joint portion is oriented in the longitudinal direction and the width direction. One of them extends, and a plurality of them are provided at intervals in the other of the longitudinal direction and the width direction. The absorbent joints provided with adhesive materials are difficult for body fluids to penetrate, while the non-absorbent joints without adhesive materials are easy for body fluids to penetrate. According to this aspect, the body fluid absorbed by the upper absorbent body can be spread in one direction in the non-absorbent joint portion, which is the interval between the absorbent joint portions, and the body fluid can be absorbed over a wide area. The body fluid is diffused by the non-absorbent joint part, and on the other hand, the diffusion in the other direction is suppressed by the absorbent joint parts arranged on both sides of the non-absorbent joint part. It is possible to suppress accumulation of liquid in the peeled portion of the upper absorbent body and the lower absorbent body due to excessive diffusion of body fluids between the upper absorbent body and the lower absorbent body, and to continuously suck body fluids toward the lower absorbent body side.

According to a preferred aspect, if the absorbent article further has an absorbing joint portion for joining the upper absorbent body and the lower absorbent body via an adhesive material, and the absorbent article is folded based on a pair of fold lines extending in the width direction, The upper absorbent system has an outer region arranged on the outer side closer to the longitudinal direction than the fold line, and the absorbent joint portion is provided in a region that does not overlap the outer region. The outer area of the upper absorbent body is not joined to the lower absorbent body and is easily moved when folded during the manufacturing process and unfolded during the installation process. As the outer area moves, the super-absorbent polymer in the upper absorbent body becomes easier to diffuse, and body fluids can be retained in a wide range of the absorbent body.

According to an ideal aspect, the absorbing joint portion is provided in a region that does not overlap with the pair of fold lines. If the fold line overlaps with the absorbing joint, a fold line will be formed strongly, and the rigidity of the upper absorbent body will increase in the area overlapping the fold line. However, since the folding line does not overlap with the absorbing joint, it is possible to suppress the rigidity of the upper absorbent body from becoming locally high. There is no local increase in the rigidity of the upper absorbent body that hinders the expansion of the super-absorbent polymer. The super-absorbent polymer becomes easy to expand and the absorption performance can be maintained.

According to a preferred aspect, the absorbent article further has an absorption joining portion for joining the upper absorbent body and the lower absorbent body via an adhesive material; and is provided for joining the non-skin-facing surface of the absorbent article to the wearing article. In the adhesive portion of the adhesive, the aforementioned absorbing joint portion and the aforementioned adhesive portion are both provided with non-overlapping portions that do not overlap in the thickness direction. The non-overlapping part does not overlap with any of the absorption joint part and the adhesive part, and can ensure breathability and dryness. By having non-overlapping portions, the stuffiness of the entire absorbent article can be reduced and the wearing feel can be improved.

(2) Overall schematic structure of absorbent articles Hereinafter, the absorbent article according to the embodiment will be described with reference to the drawings. In addition, in the following drawing description, the same or similar parts are given the same or similar symbols. However, the figures are schematically displayed, so please note that the ratios of various dimensions, etc. may differ from those of the actual product. Therefore, specific dimensions, etc. should be judged with reference to the following description. In addition, the drawings may include different parts such as mutual dimensional relationships and ratios.

Absorbent items are pads. Furthermore, the absorbent article of the present invention may be an absorbent article that is worn on underwear and used, and may be a light incontinence pad, for example. FIG. 1 is a plan view of the absorbent article 1 of this embodiment as viewed from the skin-facing side. Fig. 2 is a plan view of the absorbent article shown in Fig. 1 when viewed from the non-skin-facing side. Fig. 3 is a schematic cross-sectional view along line A-A of the absorbent article shown in Fig. 1 . Fig. 4 is a schematic cross-sectional view along line B-B of the absorbent article shown in Fig. 1 .

The absorbent article 1 has a longitudinal direction L and a width direction W that are orthogonal to each other. The length direction L is defined by the direction extending toward the front side of the body and the rear side of the body. In other words, the length direction L is a direction extending forward and backward on the unfolded absorbent article 1 . Furthermore, the absorbent article 1 has a thickness direction T orthogonal to both the longitudinal direction L and the width direction W. The thickness direction T extends toward the skin-facing side T1 facing the wearer and the non-skin-facing side T2 opposite to the skin-facing side T1.

The absorbent article 1 has at least the surface sheet 10, the back sheet 20, and the absorber 30. The surface sheet 10 is made of a liquid-permeable sheet such as nonwoven fabric or perforated plastic film. The surface sheet 10 may be formed by laminating a plurality of sheets, or may have a second sheet. For example, the surface sheet 10 may be composed of a laminated sheet of a cotton sheet containing cotton fibers and a sheet made of rayon and polyethylene. The surface sheet 10 may also be composed of the laminated sheet and a second sheet of air-through nonwoven fabric. 10. The surface sheet 10 of this embodiment is made of air-through nonwoven fabric. Alternatively, a cotton sheet may be provided on the side T1 closer to the skin-facing side than the air-through nonwoven fabric. Since the cotton sheet will come into contact with the wearer's skin, it can improve the skin feel.

The back sheet 20 is made of a liquid-impermeable sheet such as a plastic film. The back sheet 20 has breathability. According to the breathable back sheet 20, when urine, sweat, etc. are absorbed, moisture can be easily discharged to the outside of the absorbent article through the back sheet 20. Therefore, it can reduce the stuffiness and improve the wearing feeling. The surface sheet 10 and the back sheet 20 reach the outer edge 1E of the absorbent article 1 . In this embodiment, the outer edge is the outer end in the width direction W, the front edge is the front edge, and the rear edge is the rear edge. Moreover, the outer edge is an edge including the outer peripheral edge, the front end edge, and the rear end edge.

As shown in FIG. 2 , an adhesive portion 50 for joining the absorbent article 1 to the underwear is arranged on the non-skin facing surface of the back sheet 20 . The adhesive portion 50 is a portion provided with an adhesive material for joining the absorbent article 1 to underwear. The adhesive portions 50 extend in the width direction W, and are provided in plural numbers at intervals in the length direction L. The adhesive portion 50 does not reach the outer edge joint portion 40 described below. That is, the adhesive portion 50 and the outer edge joint portion 40 are separated in plan view. Between the adhesive portion 50 and the outer edge joint portion 40, there is a portion that is not joined to the wearing article (not overlapped with the adhesive portion) and the sheets are not joined to each other (not overlapped with the outer edge joint portion 40). The thickness of the portion between the adhesive portion 50 and the outer edge joint portion 40 tends to become thicker when the super absorbent polymer 32 expands. It does not hinder the expansion of the super-absorbent polymer, and the super-absorbent polymer becomes easy to swell and can maintain its absorption performance.

Some users may hold the outer edge joint part 40 when wearing the absorbent article 1 . Since the adhesive portion 50 does not reach the outer edge joint portion 40, even if the outer edge joint portion 40 is held when wearing, the adhesive portion 50 will not be touched, making it easy to adhere to the wearing article and easy to remove from the wearing article. Down. Furthermore, when worn, the outer edge in the width direction of the absorbent article 1 is disposed near the stitching of the crotch portion of the wearing article and is easily deformed by the wearer's movements. Since the adhesive portion 50 does not reach the outer edge joint portion 40, the side edges of the absorbent article do not directly follow the movement of the wearing article, and deformation of the absorbent article can be suppressed. Furthermore, the adhesive portion 50 may be covered with a covering sheet (not shown) before use of the absorbent article. Furthermore, in the modified example, the adhesive portions 50 extend in the length direction L and are provided in plural at intervals in the width direction W, and can also reach the outer edge joint portion 40 .

The absorber 30 is arranged between the front sheet 10 and the back sheet 20 . The absorbent body 30 has at least hydrophilic fibers 31 and super absorbent polymer (SAP) 32 . The absorbent article 1 of this embodiment is used as a pad for a long period of time. The fibers can absorb body fluids such as secretions and sweat, and the super-absorbent polymer 32 can also absorb body fluids caused by slight incontinence. This absorber 30 will be described in detail later.

Before use, the absorbent article 1 is folded using a pair of fold lines FL extending in the width direction W as base points. The pair of folding lines FL includes a first folding line FL1 and a second folding line FL2 arranged with a gap in the longitudinal direction L from the first folding line FL1.

At least the outer edge joint portion 40 that joins the front sheet 10 and the back sheet 20 is provided along the outer edge 1E of the absorbent article 1 . The outer edge joining part 40 only needs to join at least the front sheet 10 and the back sheet 20, and may also join the absorber 30. The outer edge joint 40 can also reach the outer edge 1E of the absorbent article 1 . The outer edge joint part 40 can be formed by any one of thermal welding, ultrasonic welding, embossing, or the like. The outer edge joint part 40 of this embodiment joins the surface sheet 10, the back sheet 20, and the lower layer absorbent body 36 mentioned later by embossing process. By providing the outer edge joint 40 by embossing on the outer edge 1E of the absorbent article 1, even if the body fluid reaches the outer edge of the absorbent article 1, the body fluid can be retained in the outer edge joint 40 with high density. , can suppress lateral leakage. Furthermore, when the outer edge of the outer edge joint part 40 coincides with the outer edge of the absorbent article 1, the area inside the outer edge joint part 40 (the area where the sheets and the lower absorbent body are not joined) can be made wider. Therefore, it is possible to inhibit the expansion of the super absorbent polymer 32 from being hindered. Furthermore, the outer edge joint portion 40 is shown in FIGS. 1 and 2 , and is omitted from the cross-sectional views of FIGS. 3 and 4 for convenience of explanation.

Next, the structure of the absorber 30 will be described in detail. The absorbent body 30 includes an upper absorbent body 35 and a lower absorbent body 36 disposed closer to the non-skin-opposing surface side T2 than the upper absorbent body 35 . The area of the lower absorbent body 36 is larger than the area of the upper absorbent body 35 . The lower absorbent body 36 has an extension region R10 extending further than the upper absorbent body 35 in plan view. The extension area R10 is a hatched area in FIG. 5 . The lower absorbent body 36 is arranged on the entire absorbent article 1, and the outer edge of the lower absorbent body 36 coincides with the outer edge of the absorbent article. The upper absorbent body 35 is rectangular in plan view and spans the center of the width direction W and the center of the length direction L of the absorbent article 1 . The outer edge of the upper layer absorbent body 35 is located closer to the inside in the width direction W than the outer edge of the absorbent article 1 . In the longitudinal direction L, the outer edge of the upper absorbent body 35 is located further inside than the outer edge of the absorbent article 1 . Therefore, the extended regions R10 are respectively provided on the outside closer to the longitudinal direction L than the upper layer absorbent body 35 and to the outside closer to the width direction W than the upper layer absorbent body 35 . The extended region R10 is a region between the outer edge of the upper absorbent body 35 and the outer edge 1E of the absorbent article.

The extended region R10 has a first region R11 disposed on the upper absorbent body 35 side and a second region R12 disposed on the outer edge side of the absorbent article. The first region R11 is a region arranged on the upper absorbent body 35 side among the regions that bisect the extension region R10 in the longitudinal direction L or the width direction W. In FIG. 5 , the boundary between the first region R11 and the second region R12 is represented by a dotted chain line. The boundary between the first region R11 and the second region R12 in this embodiment is a line connecting the midpoint of the outer edge of the upper absorbent body 35 and the outer edge of the absorbent article 1 .

The upper absorbent body 35 has at least hydrophilic fibers 31 . The basis weight of the super-absorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 is smaller than the basis weight of the super-absorbent polymer 32 exposed on the skin-facing surface of the lower absorbent body 36 in the extended region R10. . The skin-facing surface of the upper absorbent body 35 and the skin-facing surface of the lower absorbent body 36 are the skin-facing surface side T1 of each absorbent body and face facing the surface sheet. Furthermore, the super-absorbent polymer 32 exposed on the skin-facing surface of the extended region R10 of the lower absorbent body 36 is arranged to be larger than the super-absorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35. That is, the superabsorbent polymer 32 exposed on the surface of the upper absorbent body 35 facing the skin does not need to be present. Alternatively, the superabsorbent polymer 32 may not be disposed in the upper absorbent body 35 and the lower absorbent body 36 , but may be disposed on the skin-facing surface of the upper absorbent body 35 and the skin-facing surface of the lower absorbent body 36 . Sex polymer 32. In this embodiment, the super absorbent polymer 32 is arranged in the upper absorbent body 35, and a part of the super absorbent polymer 32 is exposed on the skin-facing surface of the upper absorbent body 35. In addition, the super absorbent polymer 32 is not disposed in the lower absorbent body 36 , but the super absorbent polymer 32 overflowing from the upper absorbent body 35 is exposed in the extension region R10 of the lower absorbent body 36 . Furthermore, in the case where the lower absorbent body 36 extends to the outer edge of the absorbent article, in order to prevent the super absorbent polymer 32 from overflowing from the outer edge 1E of the absorbent article 1, it is desirable not to place high-rise fabrics on the side edges of the absorbent article. As for the absorbent polymer 32, it is more preferable that the super absorbent polymer 32 is not disposed in the lower absorbent body 36. Furthermore, in the case where the super absorbent polymer 32 is not arranged at the outer edge of the absorbent body 30 (the super absorbent polymer 32 is arranged only in the central part of the absorbent body), in order to ensure the water retention capacity of the entire absorbent article, it is possible to The superabsorbent polymer 32 is disposed in the lower absorbent body 36 . Furthermore, in this embodiment, the mass of the super-absorbent polymer 32 of the lower absorbent body 36 is lower than the mass of the super-absorbent polymer 32 of the upper absorbent body 35 .

The basis weight of the super absorbent polymer 32 is compared in a state where colored water is dropped and the super absorbent polymer 32 of the upper absorbent body 35 and the super absorbent polymer 32 of the extended region R10 absorb the moisture. Confirm the difference visually. A region with a dark color per unit area or a region with a large color change per unit area is a region with a large basis weight of the super absorbent polymer 32 . As another method for comparing the basis weight of the super absorbent polymer 32, the super absorbent polymer 32 can be immersed in colored water for about 30 minutes and the amount of the super absorbent polymer 32 expanded by the absorption of the colored water can be measured, so that the super absorbent polymer 32 can be compared. Basis weight of polymer 32. Furthermore, the basis weight of the super-absorbent polymer 32 exposed on the surface of the upper absorbent body 35 facing the skin is the basis weight of not all the super-absorbent polymer 32 of the upper absorbent body 35, and does not include unexposed parts. The superabsorbent polymer 32 on the skin-facing surface of the upper absorbent body 35 is only based on the basis weight of the superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 . Similarly, the basis weight of the super-absorbent polymer 32 exposed on the skin-facing surface of the lower absorbent body 36 in the extension region R10 does not include the super-absorbent polymer 32 on the skin-facing surface of the lower absorbent body 36 that is not exposed. 32, the basis weight of the super absorbent polymer 32 that exposes only the surface of the lower absorbent body 36 facing the skin.

According to this structure, body fluids can be quickly absorbed through the hydrophilic fibers 31 of the upper absorbent body 35 . The body fluid sucked into the upper absorbent body 35 is guided to the lower absorbent body 36 while spreading in the upper absorbent body 35 . At this time, since the basis weight of the super-absorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 is smaller, gel clogging on the skin-facing surface of the upper absorbent body 35 can be suppressed, and body fluids can be absorbed It is continuously inhaled into the upper absorbent body 35 . If the basis weight of the superabsorbent polymer 32 exposed on the skin-facing side of the upper absorbent body 35 is relatively large, the migration of body fluids from the skin-facing side of the upper absorbing body 35 to the non-skin side will be hindered. Yu. However, since the basis weight of the super-absorbent polymer 32 exposed on the surface of the upper absorbent body 35 facing the skin is smaller, body fluids can be continuously sucked into the upper absorbent body 35, and body fluids can be suppressed from remaining in the upper absorbent body. 35 discomfort and foreign body sensation. In addition, the basis weight of the super-absorbent polymer 32 in the extended region R10 of the lower absorbent body 36 is relatively large, and the body fluid that leaks out from the upper absorbent body 35 to the side is retained by the super-absorbent polymer 32 in the extended region R10, thereby suppressing Lateral leakage. The extended region R10 is offset to the outside from the center of the absorbent article 1 for expelling body fluids. Therefore, even if gel clogging occurs due to the superabsorbent polymer 32 in the extended region R10, body fluids can be continuously retained.

The basis weight of the super-absorbent polymer 32 exposed on the skin-facing surface of the first region R11 in the extended region R10 is greater than the basis weight of the super-absorbent polymer 32 exposed on the skin-facing surface of the second region R12. . Since the basis weight of the super absorbent polymer 32 in the first region R11 is relatively large, body fluids can be further retained in the first region R11 located inside the absorbent article 1 in a plan view. It becomes difficult for body fluids to reach the outer edge 1E of the absorbent article 1, and lateral leakage can be suppressed. The second region R12 is in contact with a sweat-prone region separated from the excretory part. The second region R12 can reliably absorb sweat in which the amount of water emitted is less than that of excretion. In addition, since the basis weight of the super absorbent polymer 32 in the second region R12 is low, discomfort to the skin caused by the unevenness of the super absorbent polymer 32 when it expands can be reduced.

The upper absorbent body 35 is an air-laid nonwoven fabric containing hydrophilic fibers 31 and super absorbent polymer 32 . Air-laid nonwoven fabrics have high liquid suction properties and high release properties of sucked liquids. Therefore, the discharged body fluid can be quickly sucked into the upper absorbent body 35, and the body fluid can be quickly guided to the lower absorbent body 36. In addition, since the air-laid nonwoven fabric has high diffusivity in the plane direction, the body fluid sucked into the upper absorbent body 35 can be diffused over a wide range. Therefore, the wide area of the upper absorbent body 35 can retain body fluids, and the body fluids can also be easily guided to the extended region R10 of the lower absorbent body 36 . Therefore, gel clogging caused by local absorption of body fluids in the upper absorbent body 35 can be suppressed.

The outer edge of the lower absorbent body 36 may be consistent with the outer edge of the absorbent article 1 . The area of the lower absorbent body 36 can be made wider to ensure the absorption capacity. Furthermore, the superabsorbent polymer 32 exposed in the extended region R10 can retain body fluids and prevent the body fluids from reaching the outer edge 1E of the absorbent article 1 . That is, while ensuring the absorption capacity of the lower absorbent body 36, lateral leakage from the outer edge 1E of the absorbent article can be suppressed.

In the upper absorbent body 35, the hydrophilic fibers 31 are arranged at least on the surface on the lower absorbent body 36 side, and the superabsorbent polymer 32 is at least arranged closer to the skin than the hydrophilic fibers 31 on the surface on the lower absorbent body 36 side. Opposite surface side T1. By the hydrophilic fiber 31 with the higher absorbency polymer 32 located closer to the non-skin-opposite side T2, body fluids that cannot be completely absorbed by the higher absorbent polymer 32 in the upper absorbent body 35 can be sucked in and absorbed. By sucking the body fluid toward the non-skin-facing surface side T2 in the upper absorbent body 35, the body fluid can be smoothly guided toward the lower absorbent body 36.

In the absorbent body 30, the density of the super absorbent polymer 32 may be constant or different. As shown in FIG. 3 , the upper absorbent body 35 has a central region 35RC including the center in the thickness direction of the upper absorbent body 35 and a surface side region 35RS located outside the central region 35RC in the thickness direction. The boundary between the central region 35RC and the surface side region 35RS divides the upper absorbent body 35 into three equal parts in the thickness direction. The density of the super absorbent polymer 32 in the central region 35RC is higher than the density of the super absorbent polymer 32 in the surface side region 35RS. Since the superabsorbent polymer 32 in the central region 35RC has a high density, the central region 35RC easily expands when absorbing body fluids. Therefore, the absorption capacity of body fluids can be ensured. In addition, the density of the super-absorbent polymer 32 in the surface side region 35RS is low, and when absorbing body fluids, gel clogging is less likely to occur, and the absorbability of body fluids can be maintained. Furthermore, as a method of measuring the density, the cross section of the absorber along the thickness direction is cut, the cross section is photographed using an electronic photo, and the superabsorbent polymer 32 contained in the same area in each region is measured. The number is measured as the greater the number, the higher the density. In addition, as another method of measuring the amount of the super absorbent polymer 32, it is possible to immerse it in colored water for about 30 minutes and measure the amount of the super absorbent polymer 32 that expands due to the absorption of the colored water. The larger the amount, the higher the amount. The higher the density, the higher the density.

The absorber 30 may have thermally fusible fibers 33 . The thermally fusible fiber 33 is arranged only in the lower absorbent body 36 among the upper absorbent body 35 and the lower absorbent body 36 . That is, the thermally fusible fiber 33 is not arranged in the upper absorbent body 35 . The thermally fusible fiber 33 is heated during the manufacturing process to form a thermally fusible portion. By forming the heat-melted portion in the lower absorbent body 36, the bonding force between the fibers becomes stronger and the lower absorbent body 36 becomes less likely to twist. Therefore, the absorbent article as a whole becomes less likely to twist, can be continuously positioned appropriately facing the body, and can suppress leakage and the occurrence of discomfort. In addition, since the heat-fusible fiber 33 is not arranged in the upper absorbent body 35, no heat-fusible portion is formed in the upper absorbent body 35. The expansion of the super-absorbent polymer 32 will not be hindered due to the stronger bonding force between fibers. The super-absorbent polymer 32 will easily expand and the absorption performance can be maintained.

The upper absorbent body 35 of this embodiment is an air-laid nonwoven fabric with hydrophilic fibers 31, a binder (binding material), a hydrophilic agent, and a super absorbent polymer 32, and the lower absorbent body 36 is made of an adhesive ( Air-laid nonwoven fabric (binding material), hydrophilic agent, and heat-melting fiber 33. The air-laid nonwoven fabric of the lower absorbent body 36 does not have the super-absorbent polymer 32, and the super-absorbent polymer 32 is disposed on the air-laid non-woven fabric.

The absorbent article 1 has the absorption joint part 70 which joins the upper absorbent body 35 and the lower absorbent body 36. FIG. 5 is a plan view showing the absorption joint portion 70 where the upper absorbent body 35 and the lower absorbent body 36 are joined. The absorbing joint portions 70 extend in one of the longitudinal direction L and the width direction W, and are provided in plural at intervals in the other of the longitudinal direction L and the width direction W. The absorption joint portions 70 of this embodiment extend in the width direction W, and are provided in plural numbers at intervals in the length direction L. Furthermore, in the modified example, the absorbing joint portions 70 extend in the longitudinal direction L, and a plurality of them are provided at intervals in the width direction W. Moreover, the absorption joint part 70 extends in the same direction as the adhesive part 50, and is arrange|positioned at intervals in the same direction as the adhesive part 50.

The absorbent joint portion 70 provided with an adhesive material is difficult for body fluids to penetrate, while the non-absorbent joint portion 70 provided with no adhesive material is easily permeable for body fluids. The non-absorbent joint portion is a portion other than the absorbent joint portion 70 . According to this aspect, the body fluid absorbed by the upper absorbent body 35 can be diffused in one direction in the non-absorbent joint portion, which is the interval between the absorbing joint portions 70, and the body fluid can be absorbed over a wide area. The body fluid is diffused in the width direction W by the non-absorbent joint portion, while the diffusion is suppressed by the absorbent joint portions 70 disposed on both sides of the non-absorbent joint portion in the longitudinal direction L. It is possible to suppress accumulation of liquid in the peeled portion of the upper absorbent body 35 and the lower absorbent body 36 due to excessive diffusion of body fluids between the upper absorbent body 35 and the lower absorbent body 36, and to continuously suck body fluids toward the lower absorbent body 36 side.

The absorbing joint portion 70 is provided in a region that does not overlap with the pair of fold lines FL of the absorbent article 1 . If the absorbing joint portion 70 overlaps the fold line FL, a fold will be formed strongly, and the rigidity of the upper absorbent body 35 will become higher in the area overlapping the fold line FL. However, since the absorption joint portion 70 and the fold line FL do not overlap, it is possible to suppress the rigidity of the upper absorbent body 35 from becoming locally high. There is no local increase in rigidity of the upper absorbent body 35 that hinders the expansion of the super-absorbent polymer 32. The super-absorbent polymer 32 becomes easy to expand, and the absorption performance can be maintained.

The upper absorbent body 35 overlaps at least one of the pair of fold lines FL. As shown in FIG. 5 , the upper absorbent body 35 has an outer region R15 disposed closer to the outside in the longitudinal direction L than the fold line FL. In this embodiment, one end in the longitudinal direction L of the upper absorbent body 35 is located outside the first fold line FL1 in the longitudinal direction L, and the other end in the longitudinal direction L of the upper absorbent body 35 coincides with the second fold line FL2. Therefore, the outer region R15 of the upper absorbent body 35 is provided outside the first fold line FL1 in the longitudinal direction L. The outer region R15 is not joined to the lower absorbent body 36 and is easily moved when folded during the manufacturing process or unfolded during the installation process. As the outer region R15 moves, the superabsorbent polymer 32 in the upper absorbent body 35 becomes easy to diffuse, and body fluids can be retained in a wide range of the absorbent body.

As shown in FIG. 4 , the absorbent article 1 is provided with a non-overlapping portion R20 that does not overlap with any of the absorption joint portion 70 and the adhesive portion 50 in the thickness direction T. The non-overlapping portion R20 does not overlap with any of the absorption joint portion 70 and the adhesive portion 50, and can ensure breathability and dryness. It can reduce the stuffiness of the entire absorbent article and improve the wearing feel.

As mentioned above, the present invention has been described in detail using the above-mentioned embodiments. However, for those skilled in the art, the present invention is not limited to the embodiments described in this specification. The present invention can be implemented with various modifications and changes without departing from the technical idea and scope of the invention as defined by the description in the patent application. Therefore, the description in this specification is for the purpose of illustration and is not intended to limit the present invention.

Furthermore, the entire contents of Japanese Patent Application No. 2019-121743 filed on June 28, 2019 are incorporated into this specification by reference. [Industrial utilization possibility]

According to the present invention, it is possible to provide an absorbent article that can suppress gel clogging and easily and continuously absorb body fluids.

1:Absorbent items 1E:Outer edge 10:Surface flakes 20: Back sheet 30:Absorbent 31:Hydrophilic fiber 32:Highly absorbent polymer 33: Thermal fusible fiber 35: Upper absorbent body 36: Lower absorbent body 50: Adhesive part 70: Absorption joint L:Length direction T:Thickness direction T1: skin facing side T2: Non-skin facing side W: Width direction R10: extended area 35RC: Central area 35RS: Surface side area

[Fig. 1] is a plan view of the absorbent article according to the embodiment as viewed from the skin-facing side. [Fig. 2] is a plan view of the absorbent article according to the embodiment as viewed from the non-skin-facing side. [Fig. 3] is a schematic cross-sectional view along line A-A of the absorbent article shown in Fig. 1. [Fig. [Fig. 4] It is a schematic cross-sectional view along line B-B of the absorbent article shown in Fig. 1. [Fig. 5] is a plan view showing the joint portion of the upper absorbent body and the lower absorbent body.

1E:Outer edge

10:Surface flakes

20: Back sheet

30:Absorbent

31:Hydrophilic fiber

32:Highly absorbent polymer

33: Thermal fusible fiber

35: Upper absorbent body

36: Lower absorbent body

50: Adhesive part

70: Absorption joint

T:Thickness direction

T1: skin facing side

T2: Non-skin facing side

R10: extended area

35RC: Central area

35RS: Surface side area

Claims (9)

An absorbent article having: mutually orthogonal length directions and width directions; a liquid-permeable surface sheet; a liquid-impermeable back sheet; and an absorbent article disposed between the surface sheet and the back sheet and having at least hydrophilicity An absorbent body made of fiber and highly absorbent polymer, characterized in that the aforementioned absorption system includes: an upper absorbent body having at least the aforementioned hydrophilic fiber; and a lower absorbent layer disposed closer to the non-skin-opposite side than the aforementioned upper absorbent body. body, the aforementioned lower absorbent system has an extended area extending further in the aforementioned length direction and the aforementioned width direction than the aforementioned upper absorbent body, and the basis weight of the super absorbent polymer exposed on the surface of the aforementioned upper absorbent body facing the skin is, The basis weight of the super-absorbent polymer exposed on the surface opposite to the skin is smaller than that of the extended area. The absorbent system has heat-fusible fibers. The heat-fusible fibers are only arranged on the upper absorbent body and the lower absorbent body. The aforementioned lower absorbent body. An absorbent article having: mutually orthogonal length directions and width directions; a liquid-permeable surface sheet; a liquid-impermeable back sheet; and an absorbent article disposed between the surface sheet and the back sheet and having at least hydrophilicity The absorbent body of fiber and highly absorbent polymer has the following characteristics: The absorbent system includes: an upper absorbent body having at least the hydrophilic fibers; and a lower absorbent body disposed closer to the non-skin-facing side than the upper absorbent body, and the lower absorbent system has a length longer than that of the upper absorbent body. direction and the width direction, the basis weight of the super-absorbent polymer exposed on the skin-opposite side of the upper absorbent body is higher than the high-absorption polymer on the skin-opposite side of the above-mentioned extension area. The basis weight of the absorbent polymer is small, and the extended region includes: a first region disposed on the upper absorbent body side; and a second region disposed on the outer edge side of the absorbent article, and the first region is exposed to the skin The basis weight of the superabsorbent polymer on the opposite side is greater than the basis weight of the superabsorbent polymer on the side opposite to the skin in the second region. An absorbent article having: mutually orthogonal length directions and width directions; a liquid-permeable surface sheet; a liquid-impermeable back sheet; and an absorbent article disposed between the surface sheet and the back sheet and having at least hydrophilicity An absorbent body made of fiber and highly absorbent polymer, characterized in that the aforementioned absorption system includes: an upper absorbent body having at least the aforementioned hydrophilic fiber; and a lower absorbent layer disposed closer to the non-skin-opposite side than the aforementioned upper absorbent body. body, the aforementioned lower absorbent system has an extended area extending further in the aforementioned length direction and the aforementioned width direction than the aforementioned upper absorbent body, The basis weight of the super-absorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the super-absorbent polymer exposed on the skin-facing surface of the extended area, and the upper absorbent body also has the ability to absorb the upper layer The absorbent article is an absorbent joint portion where the body and the lower absorbent body are bonded with an adhesive material; the absorbent article is folded with a pair of fold lines extending in the width direction as base points; and the upper absorbent system has an absorbent article arranged closer to the longitudinal direction than the fold lines. In the outer outer region, the absorbing joint portion is provided in an area that does not overlap with the outer outer region. The absorbent article according to Claim 3, wherein the absorbing joint portion is provided in a region that does not overlap with the pair of fold lines. An absorbent article having: mutually orthogonal length directions and width directions; a liquid-permeable surface sheet; a liquid-impermeable back sheet; and an absorbent article disposed between the surface sheet and the back sheet and having at least hydrophilicity An absorbent body made of fiber and highly absorbent polymer, characterized in that the aforementioned absorption system includes: an upper absorbent body having at least the aforementioned hydrophilic fiber; and a lower absorbent layer disposed closer to the non-skin-opposite side than the aforementioned upper absorbent body. body, the aforementioned lower absorbent system has an extended area extending further in the aforementioned length direction and the aforementioned width direction than the aforementioned upper absorbent body, The basis weight of the super-absorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the super-absorbent polymer exposed on the skin-facing surface of the extended area, and also has the following advantages: An absorption joint portion that joins the upper absorbent body and the lower absorbent body; and an adhesive portion provided with an adhesive for joining the non-skin-facing surface of the absorbent article to the wearing article, and the absorption joint portion and the aforementioned The adhesive parts are all provided with non-overlapping parts that do not overlap in the thickness direction. An absorbent article having: mutually orthogonal length directions and width directions; a liquid-permeable surface sheet; a liquid-impermeable back sheet; and an absorbent article disposed between the surface sheet and the back sheet and having at least hydrophilicity An absorbent body made of fiber and highly absorbent polymer, characterized in that the aforementioned absorption system includes: an upper absorbent body having at least the aforementioned hydrophilic fiber; and a lower absorbent layer disposed closer to the non-skin-opposite side than the aforementioned upper absorbent body. body, the aforementioned lower absorbent system has an extended area extending further in the aforementioned length direction and the aforementioned width direction than the aforementioned upper absorbent body, and the basis weight of the super absorbent polymer exposed on the surface of the aforementioned upper absorbent body facing the skin is, The basis weight of the super-absorbent polymer exposed on the surface opposite to the skin is smaller than that of the super-absorbent polymer in the extended area. The super-absorbent polymer is not arranged in the lower absorbent body but is arranged in the upper absorbent body and is absorbed from the upper layer. body spilled before The superabsorbent polymer is arranged in the extended region. The absorbent article according to any one of claims 1 to 6, wherein the upper absorbent system is an air-laid nonwoven fabric containing the hydrophilic fiber and the highly absorbent polymer. The absorbent article according to any one of claims 1 to 6, wherein in the upper absorbent body, the hydrophilic fiber is disposed on at least a surface of the lower absorbent body, and the superabsorbent polymer is disposed on at least The hydrophilic fiber is located closer to the skin-facing surface than the surface disposed on the absorbent body side of the lower layer. The absorbent article according to any one of claims 1 to 6, further comprising an absorbent joint portion for joining the upper absorbent body and the lower absorbent body with an adhesive material, the absorbent joint portion being oriented in the longitudinal direction and One of the width directions extends, and a plurality of them are provided at intervals in the other of the length direction and the width direction.

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