JP7129382B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorbent article such as a panty liner, a light incontinence pad, and the like, which is used by being attached to underwear.

2. Description of the Related Art Conventionally, absorbent articles that are worn on underwear and absorb body fluids such as vaginal discharge, sweat, and urine have been used. The absorbent article of Patent Document 1 has a topsheet, a backsheet, and an absorbent core disposed between the topsheet and the backsheet and having a superabsorbent polymer. The absorbent core of Patent Document 1 is mainly composed of a superabsorbent polymer, and the superabsorbent polymer is arranged over the entire plane of the absorbent core.

JP 2012-105962

The absorbent core of Patent Literature 1 is mainly composed of a superabsorbent polymer, and has excellent retention of body fluids. However, since the superabsorbent polymer is arranged over the entire planar surface of the absorbent core, once the body fluid is absorbed, the superabsorbent polymer gels and gel blocking easily occurs. When gel blocking occurs, it is difficult to continue to absorb body fluids, and leakage may occur, and body fluids may remain on the surface, resulting in poor wearing comfort.

Therefore, an absorbent article that suppresses gel blocking and easily continues to absorb bodily fluids is desired.

An absorbent article according to one aspect includes a longitudinal direction and a width direction orthogonal to each other, a liquid-permeable topsheet, a liquid-impermeable backsheet, and disposed between the topsheet and the backsheet, and at least An absorbent article comprising an absorbent body having hydrophilic fibers and a superabsorbent polymer, wherein the absorbent body comprises at least an upper absorbent body having the hydrophilic fibers and a non-skin-facing surface facing the upper absorbent body. a lower-layer absorbent body disposed on the side of the upper-layer absorbent body, the lower-layer absorbent body having an extension region extending in the longitudinal direction and the width direction from the upper-layer absorbent body, and the skin of the upper-layer absorbent body The basis weight of the superabsorbent polymer exposed on the facing surface is less than the basis weight of the superabsorbent polymer exposed on the skin facing surface of the extension region.

It is the top view seen from the skin facing side of the absorbent article concerning an embodiment. It is the top view seen from the non-skin facing surface side of the absorbent article which concerns on embodiment. FIG. 2 is a schematic cross-sectional view along the AA cross section of the absorbent article shown in FIG. 1; FIG. 2 is a schematic cross-sectional view along the BB cross section of the absorbent article shown in FIG. 1; FIG. 4 is a plan view showing a joint portion between an upper layer absorbent body and a lower layer absorbent body;

(1) Overview of Embodiments At least the following matters will become clear from the description of this specification and the accompanying drawings.
An absorbent article according to one aspect includes a longitudinal direction and a width direction orthogonal to each other, a liquid-permeable topsheet, a liquid-impermeable backsheet, and disposed between the topsheet and the backsheet, and at least An absorbent article comprising an absorbent body having hydrophilic fibers and a superabsorbent polymer, wherein the absorbent body comprises at least an upper absorbent body having the hydrophilic fibers and a non-skin-facing surface facing the upper absorbent body. a lower-layer absorbent body disposed on the side of the upper-layer absorbent body, the lower-layer absorbent body having an extension region extending in the longitudinal direction and the width direction from the upper-layer absorbent body, and the skin of the upper-layer absorbent body The basis weight of the superabsorbent polymer exposed on the facing surface is less than the basis weight of the superabsorbent polymer exposed on the skin facing surface of the extension region.

According to this aspect, the upper absorbent body has hydrophilic fibers, and the hydrophilic fibers can quickly draw in body fluids. The bodily fluid drawn by the upper layer absorbent body is led to the lower layer absorbent body while diffusing in the upper layer absorbent body. At this time, since the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is relatively small, gel blocking on the skin facing surface of the upper absorbent body can be suppressed, and body fluid can be continuously drawn into the upper absorbent body. can. In addition, the basis weight of the superabsorbent polymer in the extending area of the lower absorbent body is relatively large, and the superabsorbent polymer in the extending area retains body fluids that seep out from the upper absorbent body to the side, thereby suppressing side leakage. can. The extension region is shifted outward from the center of the absorbent article through which bodily fluids are discharged. Therefore, even if gel blocking occurs due to the superabsorbent polymer in the extended region, it is possible to continue retaining body fluids.

According to a preferred embodiment, the upper absorbent body may be an air-laid nonwoven fabric containing the hydrophilic fibers and the superabsorbent polymer.

The air-laid nonwoven fabric has a high liquid entrainment property and a high releasability of the entrained liquid. Therefore, body fluid discharged onto the upper layer absorbent body can be rapidly drawn in, and the body fluid can be rapidly guided to the lower layer absorbent body. In addition, since the air-laid nonwoven fabric has high diffusibility in the planar direction, the body fluid drawn into the upper absorbent body can be diffused over a wide area. Therefore, the body fluid can be retained in a large area of the upper absorbent body, and the body fluid can be easily guided to the extending region of the lower absorbent body. Therefore, gel blocking due to local body fluid absorption in the upper absorbent body can be suppressed.

According to a preferred aspect, in the upper-layer absorbent body, the hydrophilic fibers are arranged at least on the surface on the lower-layer absorbent body side, and the superabsorbent polymer is arranged on the surface on the lower-layer absorbent body side. It may be arranged at least on the skin-facing surface side of the fibers.

According to this aspect, body fluids that have not been absorbed by the superabsorbent polymer of the upper absorbent body can be drawn into the hydrophilic fibers located on the non-skin facing side of the superabsorbent polymer. By drawing bodily fluids to the non-skin-facing side of the upper absorbent body, the bodily fluids can be smoothly guided toward the lower absorbent body.

According to a preferred aspect, the absorbent body has heat-fusible fibers, and the heat-fusible fibers are arranged only in the lower-layer absorbent body out of the upper-layer absorbent body and the lower-layer absorbent body. may be

The heat-fusible fiber is heated during the manufacturing process to form a heat-fusible portion. By forming the heat-sealed portion in the lower absorbent body, the bonding force between the fibers is strengthened, and the lower absorbent body is less likely to twist. As a result, the absorbent article as a whole becomes less prone to twisting, and can continue to be appropriately arranged facing the body, thereby suppressing leakage and suppressing discomfort. Moreover, since the heat-fusible fibers are not arranged in the upper-layer absorbent body, the heat-fusible portion is not formed in the upper-layer absorbent body. Due to the stronger binding force between the fibers, the swelling of the superabsorbent polymer is not hindered, and the superabsorbent polymer swells easily, so that the absorbency can be maintained.

According to a preferred aspect, the extension region has a first region arranged on the upper layer absorbent body side and a second region arranged on the outer edge side of the absorbent article, and the first region The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the second region may be greater than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the second region.

According to this aspect, since the basis weight of the superabsorbent polymer in the first region is large, the first region located inside the absorbent article in a plan view can retain more body fluids. It becomes difficult for bodily fluids to reach the outer edge of the absorbent article, and lateral leakage can be suppressed.

According to a preferred aspect, the absorbent joint includes an absorbent joint provided with an adhesive for joining the upper absorbent body and the lower absorbent body, wherein the absorbent joint extends in one of the longitudinal direction and the width direction, Moreover, a plurality of them may be provided at intervals in the other of the longitudinal direction and the width direction.

Absorbent joints provided with adhesive are difficult to permeate body fluids, and non-absorbent joints provided with no adhesive are easily permeable to body fluids. According to this aspect, the body fluid absorbed by the upper absorbent body can be diffused in one direction in the non-absorbent joints, which are the spaces between the absorbent joints, and the body fluid can be absorbed over a wide area. While the non-absorbent joints diffuse body fluids, absorbent joints located on either side of the non-absorbent joints can inhibit diffusion in the other direction. It is possible to suppress accumulation of liquid in the separated part of the upper layer absorbent body and the lower layer absorbent body due to excessive diffusion of the body fluid between the upper layer absorbent body and the lower layer absorbent body, and to keep drawing the body fluid to the lower layer absorbent body side. .

According to a preferred aspect, the absorbent article has an absorbent joint portion in which the upper absorbent body and the lower absorbent body are bonded by an adhesive, and the absorbent article is folded with the pair of creases extending in the width direction as base points. The upper absorbent body may have an outer region located outside the fold line in the longitudinal direction, and the absorbent joint may be provided in a region that does not overlap with the outer region.

The outer region of the upper absorbent body is not joined to the lower absorbent body and is easily moved during folding during the manufacturing process and unfolding during the wearing process. As the outer region moves, the superabsorbent polymer in the upper absorbent body can be easily diffused, and body fluid can be retained over a wide area of the absorbent body.

According to a preferred aspect, the absorbent joint may be provided in a region that does not overlap with the pair of folds.

When the absorbent joint and the crease overlap, the crease is formed more strongly, and the rigidity of the upper absorbent body in the region overlapping the crease increases. However, since the absorbent joints do not overlap with the folds, it is possible to suppress local increases in the rigidity of the upper absorbent core. Due to the local increase in rigidity of the upper layer absorbent body, swelling of the superabsorbent polymer is not hindered, and the superabsorbent polymer swells easily, thereby maintaining the absorption performance.

According to a preferred aspect, an absorbent joint portion in which the upper absorbent core and the lower absorbent core are bonded together with an adhesive, and an adhesive for bonding the non-skin facing surface of the absorbent article to the worn article are provided. A non-overlapping portion may be provided in which neither the absorbing joint portion nor the adhesive portion overlap in the thickness direction.

The non-overlapping portion does not overlap with either the absorbent joint portion or the adhesive portion, and can ensure breathability and dryness. By having the non-overlapping portion, it is possible to reduce dampness of the entire absorbent article and improve wearing comfort.

(2) Overall Schematic Configuration of Absorbent Article Hereinafter, an absorbent article according to an embodiment will be described with reference to the drawings. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic, and the ratio of each dimension is different from the actual one. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, portions having different dimensional relationships and ratios may also be included between the drawings.

The absorbent article is a pantiliner. It should be noted that the absorbent article according to the present invention may be an absorbent article that is worn in underwear, and may be, for example, a light incontinence pad. FIG. 1 is a plan view of an absorbent article 1 according to this embodiment, viewed from the side facing the skin. FIG. 2 is a plan view of the absorbent article shown in FIG. 1 as viewed from the non-skin facing side. FIG. 3 is a schematic cross-sectional view along the AA cross section of the absorbent article shown in FIG. FIG. 4 is a schematic cross-sectional view along the BB cross section of the absorbent article shown in FIG.

The absorbent article 1 has a longitudinal direction L and a width direction W perpendicular to each other. The longitudinal direction L is defined by directions extending to the front side of the body and the rear side of the body. In other words, the longitudinal direction L is the direction extending forward and backward in the unfolded absorbent article 1 . In addition, the absorbent article 1 has a thickness direction T in which both the longitudinal direction L and the width direction W are perpendicular to each other. The thickness direction T extends to 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 a topsheet 10 , a backsheet 20 and an absorbent body 30 . The surface sheet 10 may be composed of a liquid-permeable sheet such as non-woven fabric or perforated plastic film. The topsheet 10 may be configured by laminating a plurality of sheets, or may have a second sheet. For example, the topsheet 10 may be composed of a laminated sheet of a cotton sheet containing cotton fibers and a sheet made of rayon and polyethylene, or the topsheet 10 may be constituted by the laminated sheet and a second sheet made of an air-through nonwoven fabric. may be configured. The topsheet 10 of the present embodiment is made of an air-through nonwoven fabric. Further, a cotton sheet may be provided on the skin facing surface side T1 from the air-through nonwoven fabric. Since the cotton sheet is in contact with the wearer's skin, the feel can be improved.

The backsheet 20 may be composed of, for example, a liquid-impermeable sheet such as a plastic film. The backsheet 20 may have air permeability. The air-permeable backsheet 20 facilitates the discharge of moisture to the outside of the absorbent article through the backsheet 20 when urine or sweat is absorbed. Therefore, stuffiness can be reduced and a feeling of wearing can be improved. The topsheet 10 and backsheet 20 reach the outer edge 1E of the absorbent article 1 . In the present embodiment, the outer edge is the outer edge in the width direction W, the front edge is the front edge, and the rear edge is the rear edge. Also, the outer edge is the edge of the entire outer circumference including the outer edge, the front edge and the rear edge.

As shown in FIG. 2, the non-skin facing surface of the backsheet 20 is provided with an adhesive portion 50 for bonding the absorbent article 1 to underwear. The adhesive portion 50 is a portion provided with an adhesive material that joins the absorbent article 1 to underwear. The adhesive portions 50 extend in the width direction W and are provided in plurality in the longitudinal direction L at intervals. The adhesive portion 50 does not have to reach the outer edge joint portion 40, which will be described later. That is, the adhesive portion 50 and the outer edge joint portion 40 may be separated from each other in plan view. Between the adhesive portion 50 and the outer edge joint portion 40, there is provided a portion that is not attached to the wearing article (does not overlap the adhesive portion) and that the sheets are not joined together (does not overlap the outer edge joint portion 40). The portion between the adhesive portion 50 and the outer edge joint portion 40 tends to become thicker when the superabsorbent polymer 32 expands. The swelling of the superabsorbent polymer is not hindered, the superabsorbent polymer swells easily, and the absorption performance can be maintained.

Some users may grip the outer edge joint portion 40 when wearing the absorbent article 1 . Since the adhesive part 50 does not reach the outer edge joint part 40, the adhesive part 50 is not touched even if the outer edge joint part 40 is grasped at the time of wearing, and it is easy to stick to and remove from the worn article. In addition, when worn, the outer edge of the absorbent article 1 in the width direction is located in the vicinity of the seams of the crotch portion of the worn article, and is easily deformed by the movement of the wearer. 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 worn article, thereby suppressing deformation of the absorbent article. Also, the adhesive portion 50 may be covered with a covering sheet (not shown) before use of the absorbent article. In addition, in the modified example, the adhesive portions 50 may extend in the longitudinal direction L, may be provided in plurality at intervals in the width direction W, and may reach the outer edge joint portion 40 .

The absorbent body 30 is arranged between the topsheet 10 and the backsheet 20 . Absorbent body 30 has at least hydrophilic fibers 31 and superabsorbent polymer (SAP) 32 . The absorbent article 1 of this embodiment is used as a panty liner for a long period of time. The fibers absorb body fluids such as vaginal discharge and sweat, and the superabsorbent polymer 32 can absorb body fluids caused by light incontinence. The absorbent body 30 will be described later in detail.

The absorbent article 1 may be folded around a pair of fold lines FL extending in the width direction W before use. The pair of fold lines FL has a first fold line FL and a second fold line FL2 spaced apart in the longitudinal direction L from the first fold line FL1.

An outer edge joint portion 40 where at least the topsheet 10 and the backsheet 20 are joined may be provided along the outer edge 1E of the absorbent article 1 . At the outer edge joint portion 40, at least the topsheet 10 and the backsheet 20 are joined together, and the absorber 30 may also be joined. The outer edge joint 40 may reach the outer edge 1E of the absorbent article 1 . The outer edge joint 40 may be formed by heat welding, ultrasonic welding, or embossing. In the outer edge joint portion 40 of the present embodiment, the top sheet 10, the back sheet 20, and the lower absorbent core 36, which will be described later, are joined by embossing. By embossing the outer edge joint portion 40 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 bodily fluid is retained in the outer edge joint portion 40 having a high density. , side leakage can be suppressed. Furthermore, when the outer edge of the outer edge joint portion 40 coincides with the outer edge of the absorbent article 1, a wide area inside the outer edge joint portion 40 (the area where the sheets and the lower absorbent core are not joined) can be secured. , can be suppressed from hindering the expansion of the superabsorbent polymer 32 . Note that the outer edge joint portion 40 is omitted from the cross-sectional views of FIGS. 3 and 4 for the sake of convenience shown in FIGS. 1 and 2 .

Next, the absorbent body 30 will be described in detail. The absorbent body 30 has an upper absorbent body 35 and a lower absorbent body 36 arranged on the non-skin facing surface side T2 of 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 that extends beyond the upper absorbent body 35 in plan view. The extension region R10 is a hatched region in FIG. The lower absorbent core 36 is arranged over the entire absorbent article 1, and the outer edge of the lower absorbent core 36 matches the outer edge of the absorbent article. The upper absorbent body 35 is rectangular in plan view and straddles the center of the absorbent article 1 in the width direction W and the center in the longitudinal direction L thereof. The outer edge of the upper absorbent body 35 is located inside the outer edge of the absorbent article 1 in the width direction W. As shown in FIG. In the longitudinal direction L, the outer edge of the upper absorbent body 35 is located inside the outer edge of the absorbent article 1 . Therefore, the extension regions R10 are provided outside the upper layer absorbent body 35 in the longitudinal direction L and outside the upper layer absorbent body 35 in the width direction W, respectively. The extension region R10 is a region between the outer edge of the upper absorbent core 35 and the outer edge 1E of the absorbent article.

The extension region R10 may have a first region R11 arranged on the upper absorbent body 35 side and a second region R12 arranged on the outer edge side of the absorbent article. The first region R11 is a region that is located on the upper absorbent body 35 side among the regions obtained by dividing the extension region R10 into two equal parts in the longitudinal direction L or the width direction W. As shown in FIG. In FIG. 5, the boundary between the first region R11 and the second region R12 is indicated by a dashed line. The boundary between the first region R11 and the second region R12 in the present embodiment is a line connecting the midpoints of the outer edge of the upper absorbent core 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 superabsorbent polymer 32 exposed on the skin facing surface of the upper absorbent body 35 is smaller than the basis weight of the superabsorbent polymer 32 exposed on the skin facing surface of the extension region R10 of the lower absorbent body 36 . The skin-facing surface of the upper-layer absorbent body 35 and the skin-facing surface of the lower-layer absorbent body 36 are the surfaces on the skin-facing surface side T1 of each absorbent body, and face the surface sheet. In addition, it is sufficient that the superabsorbent polymer 32 exposed on the skin-facing surface of the extending region R10 of the lower absorbent body 36 is arranged in a larger amount than the superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35. , there may be no superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 . In addition, the superabsorbent polymer 32 is placed on the skin-facing surface of the upper-layer absorbent body 35 and the skin-facing surface of the lower-layer absorbent body 36 without arranging the superabsorbent polymer 32 in the upper-layer absorbent body 35 and the lower-layer absorbent body 36 . may be placed. In this embodiment, the superabsorbent polymer 32 is placed in the upper absorbent body 35, and a part of the superabsorbent polymer 32 is exposed on the skin facing surface of the upper absorbent body 35. As shown in FIG. Also, the superabsorbent polymer 32 is not placed in the lower absorbent body 36, and the superabsorbent polymer 32 spilled from the upper absorbent body 35 is exposed in the extension region R10 of the lower absorbent body 36. FIG. In addition, in the case where the lower absorbent body 36 extends to the outer edge of the absorbent article 30, in order to prevent the superabsorbent polymer 32 from spilling out from the outer edge 1E of the absorbent article 1, the side edges of the absorbent body are provided with a high absorbent material. Preferably, no polymer 32 is placed, and more preferably, no superabsorbent polymer 32 is placed within the lower absorbent body 36 . In addition, when the superabsorbent polymer 32 is not arranged on the outer edge of the absorbent body 30 (the superabsorbent polymer 32 is arranged only on the central part of the absorbent body), the water retention capacity of the entire absorbent article is A superabsorbent polymer 32 may be placed within the underlying absorbent body 36 for security.

The basis weight of the superabsorbent polymer 32 was compared by dripping colored water, and the superabsorbent polymer 32 of the upper absorbent body 35 and the superabsorbent polymer 32 of the extension region R10 absorbed water. Check visually. A region having a dark color per unit area or a region having a large color change area per unit area is defined as a region having a large basis weight of the superabsorbent polymer 32 . Another method for comparing the basis weight of the superabsorbent polymer 32 is to immerse it in colored water for about 30 minutes, measure the number of superabsorbent polymers 32 swollen by absorbing colored water, and measure the number of superabsorbent polymers 32. Basis weight can be compared.

According to this configuration, the hydrophilic fibers 31 of the upper layer absorbent body 35 can quickly draw body fluids. The bodily fluid drawn by the upper layer absorbent body 35 is led to the lower layer absorbent body 36 while diffusing in the upper layer absorbent body 35 . At this time, since the basis weight of the superabsorbent polymer 32 exposed on the skin-facing surface of the upper layer absorbent body 35 is relatively small, gel blocking on the skin-facing surface of the upper layer absorbent body 35 can be suppressed, and body fluid can be absorbed into the upper layer absorbent body 35 . can continue to attract In addition, the basis weight of the superabsorbent polymer 32 in the extending region R10 of the lower absorbent body 36 is relatively large, and body fluids that seep out from the upper absorbent body 35 to the side are retained by the superabsorbent polymer 32 in the extending region R10. side leakage can be suppressed. The extension region R10 is shifted outward from the center of the absorbent article 1 through which bodily fluids are discharged. Therefore, even if gel blocking occurs due to the superabsorbent polymer 32 in the extension region R10, it is possible to continue retaining bodily fluids.

The basis weight of the superabsorbent polymer 32 exposed on the skin-facing surface of the first region R11 of the extension region R10 may be greater than the basis weight of the superabsorbent polymer 32 exposed on the skin-facing surface of the second region R12. . Since the basis weight of the superabsorbent polymer 32 in the first region R11 is relatively large, the inner first region R11 in plan view of the absorbent article 1 can hold more bodily fluids. It becomes difficult for bodily fluids to reach the outer edge 1E of the absorbent article 1, and lateral leakage can be suppressed. The second region R12 abuts on a sweaty region away from the excretory part. The second region R12 can reliably absorb sweat, which discharges less water than excrement. Further, since the basis weight of the superabsorbent polymer 32 in the second region R12 is low, it is possible to reduce discomfort to the skin caused by unevenness when the superabsorbent polymer 32 expands.

The upper absorbent body 35 may be an air-laid nonwoven fabric containing hydrophilic fibers 31 and superabsorbent polymers 32 . The air-laid nonwoven fabric has a high liquid entrainment property and a high releasability of the entrained liquid. Therefore, the body fluid discharged onto the upper layer absorbent body 35 can be rapidly drawn in, and the body fluid can be quickly guided to the lower layer absorbent body 36 . In addition, since the air-laid nonwoven fabric has high diffusibility in the planar direction, body fluid drawn into the upper layer absorbent body 35 can be diffused over a wide area. Therefore, the body fluid can be retained in a large area of the upper absorbent body 35, and the bodily fluid can be easily guided to the extending region R10 of the lower absorbent body 36. As shown in FIG. Therefore, gel blocking due to local body fluid absorption in the upper absorbent core 35 can be suppressed.

The outer edge of the lower absorbent core 36 may match the outer edge of the absorbent article 1 . By providing a large area for the lower absorbent body 36, the absorption capacity can be ensured. In addition, the superabsorbent polymer 32 exposed in the extension region R10 retains bodily fluids and prevents the bodily fluids from reaching the outer edge 1E of the absorbent article 1 . That is, side leakage from the outer edge 1E of the absorbent article can be suppressed while ensuring the absorption capacity of the lower layer absorbent body 36 .

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 faces the skin more than the hydrophilic fibers 31 arranged on the lower absorbent body 36 side. It is arranged at least on the surface side T1. The body fluid that has not been completely absorbed by the superabsorbent polymer 32 of the upper absorbent body 35 can be drawn in and absorbed by the hydrophilic fibers 31 positioned on the non-skin facing side T2 of the superabsorbent polymer 32. - 特許庁Bodily fluids can be smoothly guided to the lower absorbent body 36 by drawing the bodily fluids to the non-skin facing surface side T2 in the upper absorbent body 35 .

The density of the superabsorbent polymer 32 within the absorbent body 30 may be constant or may vary. As shown in FIG. 3, the upper absorbent body 35 has a central region 35RC including the center of the upper absorbent body 35 in the thickness direction, and a surface side region 35RS located outside the central region 35RC in the thickness direction. . A boundary between the central region 35RC and the surface side region 35RS is a boundary that divides the upper absorbent body 35 into three equal parts in the thickness direction. The density of the superabsorbent polymer 32 in the central region 35RC may be higher than the density of the superabsorbent polymer 32 in the surface side region 35RS. Since the density of the superabsorbent polymer 32 in the central region 35RC is high, the central region 35RC tends to swell when bodily fluids are absorbed. Therefore, the absorption capacity of body fluid can be ensured. In addition, the density of the superabsorbent polymer 32 in the surface side region 35RS is low, gel blocking is less likely to occur during absorption of body fluids, and the ability to draw in body fluids can be maintained. In addition, as a method for measuring the density, the absorbent body is cut in a cross section along the thickness direction, the cross section is photographed with an electron microscope, and the number of superabsorbent polymers 32 contained in the same area in each region is measured. , the higher the number, the higher the density. Another method for measuring the number of superabsorbent polymers 32 is to immerse them in colored water for about 30 minutes, measure the number of superabsorbent polymers 32 swollen by absorption of colored water, and measure the density as the number increases. can be measured as a higher

The absorbent body 30 may have heat-fusible fibers 33 . The heat-fusible fibers 33 may be arranged only in the lower absorbent core 36 out of the upper absorbent core 35 and the lower absorbent core 36 . That is, the heat-fusible fibers 33 do not have to be arranged on the upper absorbent body 35 . The heat-fusible fiber 33 is heated during the manufacturing process to form a heat-fusible portion. By forming the heat-sealed portion in the lower absorbent core 36, the bonding force between the fibers is strengthened, and the lower absorbent core 36 is less likely to twist. Therefore, the absorbent article as a whole becomes less prone to twisting, and can continue to be appropriately arranged facing the body, thereby suppressing leakage and suppressing discomfort. Also, since the heat-fusible fibers 33 are not arranged in the upper absorbent body 35, the upper absorbent body 35 does not have a heat-fusible portion. Due to the strong binding force between the fibers, swelling of the superabsorbent polymer 32 is not hindered, and the superabsorbent polymer 32 swells easily, thereby maintaining the absorption performance.

The upper absorbent body 35 of the present embodiment is an air-laid nonwoven fabric containing hydrophilic fibers 31, a binder (bonding material), a hydrophilic agent, and a superabsorbent polymer 32. The lower absorbent body 36 includes a binder (binding material), It is an air-laid nonwoven fabric having a hydrophilic agent and heat-fusible fibers 33 . The lower absorbent body 36 does not have the superabsorbent polymer 32 .

The absorbent article 1 has an absorbent joint portion 70 where the upper layer absorbent body 35 and the lower layer absorbent body 36 are joined. FIG. 5 is a plan view showing an absorbent joint 70 between the upper absorbent body 35 and the lower absorbent body 36. As shown in FIG. The absorbing joints 70 may extend in one of the longitudinal direction L and the width direction W, and may be provided in plurality in the other of the longitudinal direction L and the width direction W at intervals. The absorbing joints 70 of the present embodiment extend in the width direction W, and may be provided in plurality in the longitudinal direction L at intervals. In addition, in the modified example, the absorbing joints 70 may extend in the longitudinal direction L and may be provided in plurality in the width direction W at intervals. Also, the absorbing joints 70 may extend in the same direction as the adhesive portion 50 and may be spaced apart in the same direction as the adhesive portion 50 .

The absorbent joint 70 provided with an adhesive is difficult to permeate body fluids, and the non-absorbent joints provided with no adhesive is easily permeable to body fluids. A non-absorbent joint is a portion other than the absorbent joint 70 . According to this aspect, the body fluid absorbed by the upper absorbent body 35 can be diffused in one direction at the non-absorbent joints between the absorbent joints 70, and the body fluid can be absorbed over a wide area. While the non-absorbent joints diffuse the body fluid in the width direction W, the absorption joints 70 arranged on both sides in the longitudinal direction L with respect to the non-absorbent joints can suppress the diffusion. Due to excessive diffusion of bodily fluids between the upper layer absorbent body 35 and the lower layer absorbent body 36, the accumulation of liquid in the peeled portion of the upper layer absorbent body 35 and the lower layer absorbent body 36 is suppressed, and the liquid flows toward the lower layer absorbent body 36 side. It can sustain the withdrawal of bodily fluids.

The absorbent joint 70 may be provided in a region that does not overlap the pair of fold lines FL of the absorbent article 1 . When the absorbent joint 70 and the fold line FL overlap, the crease is formed more strongly, and the rigidity of the upper absorbent core 35 in the region overlapping the fold line FL increases. However, since the absorbent joints 70 and the fold lines FL do not overlap, it is possible to suppress local increases in the rigidity of the upper absorbent core 35 . Due to the local increase in rigidity of the upper layer absorbent body 35, swelling of the superabsorbent polymer 32 is not hindered, and the superabsorbent polymer 32 swells easily, so that the absorption performance can be maintained.

The upper absorbent core 35 may overlap at least one of the pair of fold lines FL. As shown in FIG. 5, the upper absorbent core 35 has an outer region R15 arranged outside in the longitudinal direction L of the fold line FL. In the present embodiment, one end in the longitudinal direction L of the upper layer absorbent body 35 is positioned outside the first fold line FL1 in the longitudinal direction L, and the other end in the longitudinal direction L of the upper layer absorbent body 35 is positioned at the second fold line FL2. is consistent with Therefore, the outer region R15 of the upper absorbent core 35 is provided outside in the longitudinal direction L of the first fold line FL1. The outer region R15 is not joined to the lower absorbent core 36, and is easily moved during folding in the manufacturing process and unfolding in the wearing process. With the movement of the outer region R15, the superabsorbent polymer 32 in the upper absorbent body 35 is easily diffused, and body fluid can be retained in a wide area of the absorbent body.

As shown in FIG. 4, the absorbent article 1 is provided with a non-overlapping portion R20 where neither the absorbent joint portion 70 nor the adhesive portion 50 overlaps in the thickness direction T. As shown in FIG. The non-overlapping portion R20 does not overlap with either the absorbing joint portion 70 or the adhesive portion 50, and can ensure breathability and dryness. The stuffiness of the entire absorbent article can be reduced, and the feeling of wearing can be improved.

Although the present invention has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented with modifications and variations without departing from the spirit and scope of the invention defined by the claims. Accordingly, the descriptions herein are for the purpose of illustration and description, and are not intended to have any limiting meaning with respect to the present invention.

ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which suppresses a gel blocking and can continue absorbing a bodily fluid easily can be provided.

1: Absorbent article 1E: Outer edge 10: Top sheet 20: Back sheet 30: Absorbent body 31: Hydrophilic fiber 32: Super absorbent polymer 33: Heat-fusible fiber 35: Upper layer absorbent body 36: Lower layer absorbent body 50: Adhesive portion 70 : Absorbent joint L : Longitudinal direction T : Thickness direction T1 : Skin facing side T2 : Non-skin facing side W : Width direction

Claims (9)

a longitudinal direction and a width direction perpendicular to each other;
a liquid-permeable surface sheet;
a liquid-impermeable backing sheet;
An absorbent article disposed between the topsheet and the backsheet and having an absorbent body containing at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent body having at least the hydrophilic fibers, and a lower absorbent body disposed on the non-skin-facing side of the upper absorbent body,
the lower-layer absorbent body has an extension region extending in the longitudinal direction and the width direction from the upper-layer absorbent body,
The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is less than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the extension region,
The absorber has heat-fusible fibers,
The absorbent article, wherein the heat-fusible fibers are arranged only in the lower absorbent core out of the upper absorbent core and the lower absorbent core . a longitudinal direction and a width direction perpendicular to each other;
a liquid-permeable surface sheet;
a liquid-impermeable backing sheet;
An absorbent article disposed between the topsheet and the backsheet and having an absorbent body containing at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent body having at least the hydrophilic fibers, and a lower absorbent body disposed on the non-skin-facing side of the upper absorbent body,
the lower-layer absorbent body has an extension region extending in the longitudinal direction and the width direction from the upper-layer absorbent body,
The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is less than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the extension region,
The extension region has a first region arranged on the upper absorbent body side and a second region arranged on the outer edge side of the absorbent article,
The absorbent article, wherein the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the first region is greater than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the second region. a longitudinal direction and a width direction perpendicular to each other;
a liquid-permeable surface sheet;
a liquid-impermeable backing sheet;
An absorbent article disposed between the topsheet and the backsheet and having an absorbent body containing at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent body having at least the hydrophilic fibers, and a lower absorbent body disposed on the non-skin-facing side of the upper absorbent body,
the lower-layer absorbent body has an extension region extending in the longitudinal direction and the width direction from the upper-layer absorbent body,
The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is less than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the extension region,
an absorbent joint portion in which the upper absorbent body and the lower absorbent body are bonded with an adhesive;
The absorbent article is folded around a pair of folds extending in the width direction,
The upper absorbent body has an outer region located outside the fold line in the longitudinal direction,
The absorbent article, wherein the absorbent joint is provided in a region that does not overlap with the outer region. 4. The absorbent article according to claim 3 , wherein said absorbent joint is provided in a region that does not overlap with said pair of creases. a longitudinal direction and a width direction perpendicular to each other;
a liquid-permeable surface sheet;
a liquid-impermeable backing sheet;
An absorbent article disposed between the topsheet and the backsheet and having an absorbent body containing at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent body having at least the hydrophilic fibers, and a lower absorbent body disposed on the non-skin-facing side of the upper absorbent body,
the lower-layer absorbent body has an extension region extending in the longitudinal direction and the width direction from the upper-layer absorbent body,
The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is less than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the extension region,
The absorbent joint part where the upper layer absorbent body and the lower layer absorbent body are joined by an adhesive material, and the adhesive part provided with an adhesive for joining the non-skin facing surface of the absorbent article to the worn article. death,
An absorbent article, wherein neither the absorbent joint portion nor the adhesive portion is provided with a non-overlapping portion that does not overlap in the thickness direction. a longitudinal direction and a width direction perpendicular to each other;
a liquid-permeable surface sheet;
a liquid-impermeable backing sheet;
An absorbent article disposed between the topsheet and the backsheet and having an absorbent body containing at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent body having at least the hydrophilic fibers, and a lower absorbent body disposed on the non-skin-facing side of the upper absorbent body,
the lower-layer absorbent body has an extension region extending in the longitudinal direction and the width direction from the upper-layer absorbent body,
The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is less than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the extension region,
The superabsorbent polymer is arranged in the upper absorbent body without being arranged in the lower absorbent body,
The absorbent article, wherein the superabsorbent polymer spilled from the upper absorbent body is arranged in the extension region. The absorbent article according to any one of claims 1 to 6 , wherein the upper absorbent body is an air-laid nonwoven fabric containing the hydrophilic fibers and the superabsorbent polymer. In the upper absorbent body, the hydrophilic fibers are arranged at least on the surface facing the lower absorbent body, and the superabsorbent polymer is located closer to the skin-facing surface than the hydrophilic fibers arranged on the lower absorbent body side. 8. The absorbent article according to any one of the preceding claims , wherein the absorbent article is arranged at least in the an absorbent joint portion in which the upper absorbent body and the lower absorbent body are bonded with an adhesive;
9. Any one of claims 1 to 8 , wherein the absorbing joints extend in one of the longitudinal direction and the width direction and are provided in plurality in the other of the longitudinal direction and the width direction at intervals. Absorbent article according to the paragraph.

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