KR102478357B1 - absorbent article - Google Patents

Abstract

An absorbent article that suppresses gel blocking and is easy to continuously absorb body fluids is provided. The absorbent article 1 includes a liquid-permeable topsheet 10, a liquid-impervious backsheet 20, and an absorbent body 30 disposed between the topsheet and the backsheet and including at least hydrophilic fibers and a superabsorbent polymer. ) has The absorbent body 30 has an upper absorbent layer 35 having at least hydrophilic fibers, and a lower absorbent layer 36 disposed on the non-skin facing side of the upper absorbent layer. The lower absorbent body has an extended region R10 that is longer than the upper absorbent body in the longitudinal direction and width direction. The basis weight of the super absorbent polymer 32 exposed on the skin facing surface of the upper absorbent layer is smaller than that of the super absorbent polymer 32 exposed on the skin facing surface of the extended region.

Description

absorbent article

The present invention relates to absorbent articles such as panty liners and light incontinence pads that are attached to underwear and used.

BACKGROUND ART Conventionally, an absorbent article that is attached to an undergarment and absorbs bodily fluids such as clams, sweat, and urine has been used. The absorbent article of Patent Literature 1 includes 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 Literature 1 is composed mainly of a superabsorbent polymer, and the superabsorbent polymer is disposed over the entire plane of the absorbent core.

Patent Document 1: Japanese Unexamined Patent Publication No. 2012-105962

The absorbent core of Patent Literature 1 is composed mainly of a superabsorbent polymer and has excellent body fluid retention. However, since the superabsorbent polymer is disposed over the entire plane of the absorbent core, once bodily fluid is absorbed, the superabsorbent polymer gels and gel blocking is likely to occur. When gel blocking occurs, it is difficult to continuously absorb the body fluid, and leakage occurs, or the body fluid remains on the surface and the wearing feeling deteriorates in some cases.

Therefore, there is a need for an absorbent article that suppresses gel blocking and is easy to continuously absorb body fluids.

An absorbent article according to one embodiment is disposed between a longitudinal direction and a transverse direction orthogonal to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and disposed between the top sheet and the back sheet, wherein at least hydrophilic fibers and a solid It has an absorber having an absorbent polymer. The absorbent body includes an upper absorbent layer having at least the hydrophilic fibers, and a lower absorbent layer disposed on a non-skin facing side of the upper absorbent layer. The lower absorbent body has an extended region extending from the upper absorbent body in the longitudinal direction and the width direction. A basis weight of the superabsorbent polymer exposed to the skin facing surface of the upper absorbent layer is smaller than that of the superabsorbent polymer exposed to the skin facing surface of the extended region.

1 is a plan view of an absorbent article according to an embodiment seen from the side facing the skin.
Fig. 2 is a plan view of the absorbent article according to the embodiment seen from the side of the non-skin facing surface.
Fig. 3 is a schematic cross-sectional view along AA section of the absorbent article shown in Fig. 1;
Fig. 4 is a schematic cross-sectional view along the BB section of the absorbent article shown in Fig. 1;
5 is a plan view showing a junction between an upper absorber layer and a lower absorber layer.

(1) Outline of Embodiment

From the description of this specification and accompanying drawings, at least the following matters become clear.

An absorbent article according to one embodiment is disposed between a longitudinal direction and a transverse direction orthogonal to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and disposed between the top sheet and the back sheet, wherein at least hydrophilic fibers and a solid It has an absorber having an absorbent polymer. The absorbent body includes an upper absorbent layer having at least the hydrophilic fibers, and a lower absorbent layer disposed on a non-skin facing side of the upper absorbent layer. The lower absorbent body has an extended region extending from the upper absorbent body in the longitudinal direction and the width direction. A basis weight of the superabsorbent polymer exposed to the skin facing surface of the upper absorbent layer is smaller than that of the superabsorbent polymer exposed to the skin facing surface of the extended region. According to this aspect, the upper absorbent body has hydrophilic fibers, and body fluids can be taken in quickly by the hydrophilic fibers. The bodily fluid taken in by the upper absorber is guided to the lower absorber while being diffused within the upper absorber. At this time, since the basis weight of the superabsorbent polymer exposed to the skin-facing surface of the upper-layer absorbent body is relatively small, gel blocking on the skin-facing surface of the upper-layer absorbent body can be suppressed, and body fluid can be continuously drawn into the upper-layer absorbent body. In addition, the basis weight of the superabsorbent polymer in the extended region of the lower absorbent layer is relatively large, and the body fluid that oozes out from the upper layer sideways is retained by the superabsorbent polymer in the extended region, so that side leakage can be suppressed. The extended area is shifted outward from the center of the absorbent article through which the bodily fluid is discharged. Therefore, even if gel blocking by the superabsorbent polymer of the extended region occurs, the body fluid can be continuously retained.

According to a preferred embodiment, the upper absorbent layer may be an air-laid nonwoven fabric containing the hydrophilic fibers and the superabsorbent polymer. The air-laid nonwoven fabric has high liquid entrainability and high release of entrained liquid. Therefore, the bodily fluid discharged onto the upper absorber layer can be quickly taken in, and the bodily fluid can be quickly guided to the lower absorber layer. In addition, since the air-laid nonwoven fabric has high diffusivity in the planar direction, the bodily fluid entrained in the upper absorbent layer can be diffused over a wide range. Therefore, in addition to being able to retain body fluid in a large area in the upper absorber, it is easy to guide the body fluid even to the extended region of the lower absorber. Therefore, gel blocking due to local body fluid absorption in the upper absorbent layer can be suppressed.

According to a preferred aspect, in the upper absorbent layer, the hydrophilic fibers are disposed on at least a surface on the lower absorbent layer side, and the superabsorbent polymer is disposed on the side facing the skin than the hydrophilic fibers disposed on the surface on the lower absorbent layer side. can be placed at least in According to this aspect, in the superabsorbent polymer of the upper absorbent layer, body fluids that are not completely absorbed can be taken in by the hydrophilic fibers located on the non-skin facing side of the superabsorbent polymer. By drawing in the body fluid to the non-skin facing side in the upper absorber, the body fluid can be smoothly guided toward the lower absorber.

According to a preferred embodiment, the absorber includes heat-fusible fibers, and the heat-fusible fibers may be disposed only in the lower absorbent layer among the upper absorbent layer and the lower absorbent layer. The heat-sealable fiber is heated during the manufacturing process to form a heat-sealed portion. By forming the heat-sealed portion in the lower absorbent layer, the bonding force between the fibers is strengthened, and the lower absorbent layer becomes difficult to twist. As a result, the entire absorbent article becomes difficult to twist and can be appropriately continuously positioned facing the body, so that leakage or uncomfortable feeling can be suppressed. In addition, since the heat-fusible fibers are not arranged in the upper absorbent layer, no heat-fusible portion is formed in the upper absorbent layer. Due to the strengthening bonding force between the fibers, the swelling of the superabsorbent polymer is not hindered, and the superabsorbent polymer is easily swollen, so that the absorbent performance can be maintained.

According to a preferred aspect, the extended region has a first region disposed on the side of the upper absorbent layer and a second region disposed on the outer edge side of the absorbent article, and the first region is exposed to the skin facing surface. The basis weight of the absorbent polymer may be greater than that of the superabsorbent polymer exposed to 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, body fluid can be retained more in the first region located on the inner side of the absorbent article in a planar view. It becomes difficult for bodily fluid to reach the outer edge of the absorbent article, and side leakage can be suppressed.

According to a preferred aspect, there is provided an absorbent bonding portion provided with an adhesive material for bonding the upper absorbent body and the lower absorbent body, wherein the absorbent bonding portion extends in one of the longitudinal direction and the width direction, and further extends in the longitudinal direction and the width direction. A plurality may be provided at intervals on the other side of the. An absorbent junction provided with an adhesive material is difficult to transmit bodily fluid, and a non-absorbent junction section provided with no adhesive material easily transmits bodily fluid. According to this aspect, the bodily fluid absorbed by the upper absorbent layer can be diffused in one direction in the non-absorbent junction, which is the interval between the absorptive junctions, and the bodily fluid can be absorbed over a wide area. While body fluid is diffused by the non-absorbable junction, diffusion in the other direction can be suppressed by the absorption junctions disposed on both sides of the non-absorbable junction. Due to excessive diffusion of bodily fluid between the upper and lower absorbent layers, pooling of the fluid at the separated portion between the upper and lower absorbent layers is suppressed, and the intake of the bodily fluid to the lower absorbent layer side can be sustained.

According to a preferred aspect, the upper absorbent layer and the lower absorbent layer have an absorbent bonded portion joined by an adhesive material, the absorbent article is folded starting from a pair of fold lines extending in the width direction, and the upper absorbent layer comprises , and an outer region disposed outside the fold line in the longitudinal direction, and the absorption bonding portion may be provided in a region that does not overlap with the outer region. The outer region of the upper absorbent layer is not bonded to the lower absorbent layer and tends to move during folding in the manufacturing process or unfolding in the mounting process. As the outer region moves, the superabsorbent polymer in the upper absorbent layer is easily diffused, and body fluids can be retained in a wide range of the absorber.

According to a preferred aspect, the absorption bonding portion may be provided in a region that does not overlap with the pair of fold lines. When the absorbent junction and the fold line overlap, the crease is strongly formed, and the rigidity of the upper absorbent layer in the region overlapping the fold line is increased. However, since the absorbent joint and the fold line do not overlap, it is possible to suppress a local increase in rigidity of the upper absorbent layer. Due to the local increase in the stiffness of the upper absorbent layer, swelling of the superabsorbent polymer is not hindered, the superabsorbent polymer is easily swelled, and the absorbent performance can be maintained.

According to a preferred embodiment, the upper absorbent layer and the lower absorbent layer have an absorbent bonding portion bonded by an adhesive material, and an adhesive portion provided with an adhesive for bonding the non-skin facing surface of the absorbent article to the wearable article, A non-overlapping portion may be provided in which none of the adhesive portions overlap in the thickness direction. The non-overlapping portion does not overlap with any of the absorbent bonding portion and the adhesive portion, and air permeability and dryness can be secured. By having a non-overlapping portion, the moisture content of the entire absorbent article can be reduced and the wearing feeling can be improved.

(2) Overall outline of the absorbent article

Hereinafter, the absorbent article according to the embodiment will be described with reference to the drawings. In addition, in description of the following drawings, the same or similar code|symbol is attached|subjected to the same or similar part. 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 must be determined in consideration of the following description. Also, parts having different dimensional relationships or ratios may be included between the drawings.

The absorbent article is a pantyliner. Further, the absorbent article according to the present invention may be an absorbent article used by being attached to an undergarment, and may be, for example, a light incontinence pad. Fig. 1 is a plan view of the absorbent article 1 according to the present embodiment, seen from the side facing the skin. Fig. 2 is a plan view of the absorbent article shown in Fig. 1 viewed from the side of the non-skin facing surface. Fig. 3 is a schematic cross-sectional view along the A-A section of the absorbent article shown in Fig. 1; Fig. 4 is a schematic sectional view taken along a BB cross section 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 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 a 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 orthogonal. The thickness direction T extends to a skin-facing surface side T1 toward the wearer side and a non-skin-facing surface side T2 opposite to the skin-facing surface side T1.

The absorbent article 1 has at least a top sheet 10, a back sheet 20, and an absorber 30. The topsheet 10 may be made of a liquid-permeable sheet such as, for example, a non-woven fabric or perforated plastic film. The topsheet 10 may be configured by stacking a plurality of sheets, or may have a second sheet. For example, the topsheet 10 may be constituted by a laminated sheet of a cotton sheet containing cotton fibers and a sheet made of rayon and polyethylene. ) may be configured. The topsheet 10 of this embodiment is made of an air-through nonwoven fabric. Moreover, you may have a cotton sheet on the skin facing surface side (T1) rather than the air-through nonwoven fabric. Since the cotton sheet touches the wearer's skin, the tactile sensation can be improved.

The back sheet 20 may be formed of, for example, a liquid impermeable sheet such as a plastic film. The back sheet 20 may have air permeability. According to the backsheet 20 having air permeability, when absorbing urine or sweat, moisture is easily discharged through the backsheet 20 to the outside of the absorbent article. Therefore, it is possible to reduce the moisture content and improve the wearing feeling. The top sheet 10 and the back sheet 20 reach to the outer edge 1E of the absorbent article 1 . In this embodiment, the outer edge is the outer edge in the width direction W, the front edge is the front edge, and the trailing edge is the rear edge. Further, the outer edge is the edge of the entire outer periphery including the outer edge, the front edge and the trailing edge.

As shown in Fig. 2, on the non-skin facing surface of the backsheet 20, an adhesive portion 50 for bonding the absorbent article 1 to the underwear is disposed. The adhesive portion 50 is a portion provided with an adhesive material for bonding the absorbent article 1 to the underwear. The adhesive portion 50 extends in the width direction W and is provided in plurality at intervals in the longitudinal direction L. The adhesive portion 50 may not reach the outer junction portion 40 described later. That is, the adhesive portion 50 and the outer joint portion 40 may not be separated from each other in a planar view. A portion is provided between the adhesive portion 50 and the outer joint portion 40 that is not bonded to the worn article (does not overlap with the adhesive portion) and does not join sheets to each other (does not overlap with the outer joint portion 40). . The portion between the adhesive portion 50 and the outer junction portion 40 tends to become thick when the superabsorbent polymer 32 expands. The swelling of the superabsorbent polymer is not inhibited, and the superabsorbent polymer is easily swollen, so that the absorbent performance can be maintained.

Some users hold the outer junction 40 when attaching the absorbent article 1 . Since the adhesive portion 50 does not reach the outer joint portion 40, even if the outer joint portion 40 is held at the time of wearing, the adhesive portion 50 does not come into contact with the adhesive portion 50, so it is easy to adhere to the wearing article and to easily remove it from the wearing article. . In addition to this, when worn, the outer edge in the width direction of the absorbent article 1 is disposed near the sewing line of the claw 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 joint portion 40, the side edge of the absorbent article does not directly follow the movement of the wearable article, and deformation of the absorbent article can be suppressed. Also, the adhesive portion 50 may be covered with a cover sheet (not shown) prior to use of the absorbent article. Further, in a modified example, the adhesive portion 50 may extend in the longitudinal direction L, may be provided in plural at intervals in the width direction W, and may reach the outer edge joint portion 40 .

The absorber 30 is disposed between the top sheet 10 and the back sheet 20 . The 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 over a long period of time. In addition to absorbing bodily fluids such as clams and sweat by the fibers, bodily fluids caused by light incontinence can also be absorbed by the superabsorbent polymer 32 . The absorber 30 will be described in detail later.

The absorbent article 1 can be folded before use starting from a pair of fold lines FL extending in the width direction W. The pair of fold lines FL include a first fold line FL and a second fold line FL2 arranged at intervals from the first fold line FL1 in the longitudinal direction L.

An outer joint 40 where at least the top sheet 10 and the back sheet 20 are joined may be provided along the outer edge 1E of the absorbent article 1 . For the outer joint portion 40, at least the top sheet 10 and the back sheet 20 need only be joined, and the absorber 30 may also be joined. The peripheral joint 40 can reach the outer edge 1E of the absorbent article 1 . The outer joint 40 may be formed by any of thermal welding, ultrasonic welding, and embossing. In the outer joint portion 40 of this embodiment, the topsheet 10, the backsheet 20, and the lower absorbent layer 36 described later are joined by embossing. Since the outer joint 40 by embossing is provided on the outer edge 1E of the absorbent article 1, even if bodily fluid reaches the outer edge of the absorbent article 1, within the outer joint 40 having a high density. By retaining bodily fluids, side leakage can be suppressed. In addition, when the outer edge of the outer joint 40 coincides with the outer edge of the absorbent article 1, the area inside the outer joint 40 (the area where the sheets and the lower absorbent body are not joined) can be secured widely. Therefore, interference with expansion of the superabsorbent polymer 32 can be suppressed. Note that the outer joint 40 is omitted from the cross-sectional views of FIGS. 3 and 4 for convenience, as shown in FIGS. 1 and 2 .

Next, the absorber 30 is explained in detail. The absorbent body 30 has an upper absorbent layer 35 and a lower absorbent layer 36 disposed on the non-skin facing side T2 of the upper absorbent layer 35. The area of the lower absorbent layer 36 is larger than that of the upper absorbent layer 35 . The lower absorbent body 36 has an extended region R10 that extends from the upper absorbent body 35 in plan view. The extended region R10 is a region drawn with an oblique line in FIG. 5 . The lower layer absorbent body 36 is disposed throughout the absorbent article 1, and the outer edge of the lower layer absorbent body 36 coincides with the outer edge of the absorbent article. The upper absorbent layer 35 has a rectangular shape in plan view, and extends over the center of the absorbent article 1 in the width direction W and the center in the longitudinal direction L. The outer edge of the upper layer absorbent body 35 is located on the inner side in the width direction W of the outer edge of the absorbent article 1 . In the longitudinal direction L, the outer edge of the upper layer absorbent body 35 is located inside the outer edge of the absorbent article 1. Therefore, the extended region R10 is provided outside the upper absorbent body 35 in the longitudinal direction L and outside the upper absorbent body 35 in the width direction W, respectively. 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 extension region R10 may have 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 disposed on the upper absorbent body 35 side among regions obtained by bisecting the extended region R10 in the longitudinal direction (L) or width direction (W). In FIG. 5 , the boundary between the first region R11 and the second region R12 is indicated by a dashed-dotted 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 layer (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 layer 35 is less than the basis weight of the super absorbent polymer 32 exposed on the skin facing surface of the extended region R10 of the lower absorbent layer 36. . The skin facing surface of the upper absorber 35 and the skin facing surface of the lower absorber 36 are the surfaces on the skin facing side (T1) of each absorber and are the surfaces facing the topsheet. In addition, the number of superabsorbent polymers 32 exposed on the skin facing surface of the extension region R10 of the lower absorbent body 36 is higher than that of the superabsorbent polymer 32 exposed on the skin facing surface of the upper absorbent body 35. It is sufficient, and the superabsorbent polymer 32 exposed to the skin facing surface of the upper absorbent body 35 does not need to exist. In addition, the superabsorbent polymer 32 is not disposed in the upper absorbent layer 35 and the lower absorbent layer 36, and the superabsorbent polymer 32 is placed on the skin facing surface of the upper absorbent layer 35 and the skin facing surface of the lower absorbent layer 36. (32) may be arranged. In this embodiment, the superabsorbent polymer 32 is disposed 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. In addition, the super absorbent polymer 32 is not disposed in the lower absorbent layer 36, and the superabsorbent polymer 32 overflowing from the upper absorbent layer 35 is exposed in the extended region R10 of the lower absorbent layer 36. . Further, in the case where the lower absorbent layer 36 extends to the outer edge of the absorbent article 30, in order to prevent the superabsorbent polymer 32 from overflowing from the outer edge 1E of the absorbent article 1, it is attached to the side edge of the absorbent article. It is preferable that the water absorbent polymer 32 is not disposed, and more preferably, the superabsorbent polymer 32 is not disposed within the lower absorbent layer 36. In the case where the superabsorbent polymer 32 is not disposed on the outer edge of the absorbent body 30 (the superabsorbent polymer 32 is disposed only in the central portion of the absorbent body), the water retention amount of the entire absorbent article is To ensure this, the superabsorbent polymer 32 may be placed in the lower absorbent body 36. Also, in this embodiment, the mass of the super absorbent polymer 32 of the lower absorbent layer 36 may be lower than the mass of the super absorbent polymer 32 of the upper absorbent layer 35 .

In comparison of the basis weight of the super absorbent polymer 32, the colored liquid is dropped, and the super absorbent polymer 32 of the upper absorbent layer 35 and the super absorbent polymer 32 of the extended region R10 absorb moisture. In this state, visually confirm the difference in color. A region with a dark color per unit area or a region with a large area of color change per unit area is defined as a region with a large basis weight of the superabsorbent polymer 32 . As another method of comparing the basis weight of the super absorbent polymer 32, immersion in a colored liquid for about 30 minutes and measuring the number of super absorbent polymers 32 swollen by absorption of the colored liquid, The basis weight of the absorbent polymer 32 can be compared. In addition, the basis weight of the superabsorbent polymer 32 exposed on the skin facing surface of the upper absorbent body 35 is not the basis weight of all the superabsorbent polymers 32 of the upper absorbent body 35, and the upper absorbent body 35 facing the skin This is the basis weight of only the super absorbent polymer 32 exposed on the skin facing surface of the upper absorbent body 35, not including the super absorbent polymer 32 not exposed on the surface. Similarly, the basis weight of the super absorbent polymer 32 exposed on the skin facing surface of the extension region R10 of the lower absorbent body 36 is the superabsorbent polymer 32 that is not exposed on the skin facing surface of the lower absorbent body 36. It is the basis weight of only the superabsorbent polymer 32 exposed on the skin facing surface of the lower absorbent body 36 without including it.

According to this configuration, the body fluid can be taken in quickly by the hydrophilic fibers 31 of the upper absorbent body 35. The bodily fluid drawn in by the upper absorber 35 is guided to the lower absorber 36 while being diffused within the upper absorber 35 . At this time, since the basis weight of the superabsorbent polymer 32 exposed on the skin facing surface of the upper absorbent body 35 is relatively small, gel blocking on the skin facing surface of the upper absorbent body 35 can be suppressed, and the upper absorbent body ( 35) can continue to draw in body fluids. For example, if the basis weight of the superabsorbent polymer 32 exposed to the skin-facing surface of the upper absorbent body 35 is relatively large, transfer of body fluid from the skin-facing surface of the upper absorbent body 35 to the non-skin surface side may be hindered. . However, since the basis weight of the superabsorbent polymer 32 exposed to the skin-facing surface of the upper absorbent layer 35 is relatively small, bodily fluids can continue to be drawn into the upper absorbent layer 35, and bodily fluids remain on the upper absorbent layer 35. It is possible to suppress a sense of incongruity and a foreign body feeling caused by remaining. In addition, the basis weight of the superabsorbent polymer 32 of the extension region R10 of the lower absorbent body 36 is relatively large, and the body fluid oozing out from the upper absorbent body 35 sideways is transferred to the superabsorbent polymer 32 of the extension region R10. By maintaining it, it is possible to suppress side leakage. The extended region R10 is shifted outward from the center of the absorbent article 1 through which body fluid is discharged. Therefore, even if gel blocking by the superabsorbent polymer 32 of the extension region R10 occurs, body fluid can be continuously retained.

The basis weight of the super absorbent polymer 32 exposed on the skin facing surface of the first region R11 of the extension region R10 is the basis weight of the super absorbent polymer 32 exposed on the skin facing surface of the second region R12. There can be more. Since the basis weight of the superabsorbent polymer 32 in the first region R11 is relatively large, body fluid can be retained more in the inner first region R11 in a plan view of the absorbent article 1 . It becomes difficult for bodily fluid to reach the outer edge 1E of the absorbent article 1, and side leakage can be suppressed. The second region R12 contacts an area prone to sweat away from the excretory area. The second region R12 can reliably absorb sweat, which produces less water than excretion. In addition, since the basis weight of the superabsorbent polymer 32 in the second region R12 is low, discomfort to the skin due to unevenness when the superabsorbent polymer 32 expands can be reduced.

The upper absorbent layer 35 may be an air-laid nonwoven fabric including hydrophilic fibers 31 and superabsorbent polymers 32 . The air-laid nonwoven fabric has high liquid entrainability and high release of entrained liquid. Therefore, the bodily fluid discharged onto the upper absorber 35 can be quickly taken in, and the bodily fluid can be quickly guided to the lower absorber 36 . In addition, since the air-laid nonwoven fabric has high diffusivity in the plane direction, the bodily fluid drawn into the upper absorbent body 35 can be diffused over a wide range. Accordingly, the bodily fluid can be held in a large area in the upper absorbent body 35, and the bodily fluid can be easily guided also to the extended region R10 of the lower absorbent body 36. Therefore, gel blocking due to local body fluid absorption in the upper absorbent body 35 can be suppressed.

The outer edge of the lower layer absorbent body 36 may coincide with the outer edge of the absorbent article 1 . By providing a wide area of the lower absorber 36, the absorption capacity can be secured. In addition, by retaining bodily fluid by the superabsorbent polymer 32 exposed in the extended region R10 , it is possible to prevent bodily fluid 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 securing the absorption capacity of the lower absorbent layer 36.

In the upper absorbent layer 35, the hydrophilic fibers 31 are disposed at least on the surface on the lower absorbent layer 36 side, and the superabsorbent polymer 32 is disposed on the surface on the lower absorbent layer 36 side. Hydrophilic fibers ( 31) at least on the skin facing surface side T1. Body fluids that are not completely absorbed in the super absorbent polymer 32 of the upper absorbent body 35 can be taken in and absorbed by the hydrophilic fibers 31 located on the non-skin facing side (T2) than the super absorbent polymer 32. there is. In the upper absorber 35, by drawing the body fluid into the non-skin facing surface side T2, the body fluid can be smoothly guided to the lower absorber 36.

The density of the superabsorbent polymer 32 in the absorber 30 may be constant or different. As shown in FIG. 3, the upper absorber 35 has a central region 35RC including the center of the upper absorber 35 in the thickness direction and a surface side located outside the central region 35RC in the thickness direction. It has a region 35RS. The boundary between the central region 35RC and the front surface region 35RS is a boundary that divides the upper absorbent body 35 into thirds in the thickness direction. A density of the super absorbent polymer 32 in the central region 35RC may be higher than that of the super absorbent 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 fluid is absorbed. Therefore, the capacity for absorbing body fluids can be secured. In addition, the density of the superabsorbent polymer 32 in the surface-side region 35RS is low, and gel blocking does not occur when bodily fluid is absorbed, so that bodily fluid entrainability can be maintained. In addition, as a method for measuring the density, the absorber is cut into a cross section along the thickness direction, the cross section is photographed with an electron microscope, and the number of superabsorbent polymers 32 included in the same area is measured in each region. , the higher the number, the higher the density. In addition, as another method of measuring the number of super absorbent polymers 32, immersed in a colored liquid for about 30 minutes, and measuring the number of super absorbent polymers 32 swollen by absorption of the colored liquid , the higher the number, the higher the density.

The absorber 30 may have heat-sealable fibers 33 . The thermally fusible fibers 33 may be disposed only on the lower absorbent layer 36 of the upper absorbent layer 35 and the lower absorbent layer 36 . That is, the thermally fusible fibers 33 may not be disposed on the upper absorbent body 35 . The heat-sealable fiber 33 is heated during the manufacturing process to form a heat-sealed portion. By forming the heat-sealed portion in the lower absorbent layer 36, the bonding force between the fibers becomes stronger, and the lower absorbent layer 36 becomes difficult to twist. Accordingly, the absorbent article as a whole becomes difficult to twist and can be appropriately continuously positioned facing the body, so that leakage or uncomfortable feeling can be suppressed. Further, since the heat-fusible fibers 33 are not disposed on the upper absorbent layer 35, no heat-fused portion is formed on the upper absorbent layer 35. Due to the strengthening of the bonding force between the fibers, the expansion of the super absorbent polymer 32 is not hindered, and the super absorbent polymer 32 is easily swelled, so that the absorbent performance can be maintained.

The upper absorbent layer 35 of this embodiment is an air-laid nonwoven fabric having hydrophilic fibers 31, a binder (binder), a hydrophilic agent, and a superabsorbent polymer 32, and the lower absorbent layer 36 is a binder (binder) , It is an air-laid nonwoven fabric having a hydrophilic agent and heat-sealable fibers (33). The air-laid nonwoven fabric of the lower absorbent layer 36 does not have the superabsorbent polymer 32, and the superabsorbent polymer 32 is disposed on the airlaid nonwoven fabric.

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

The absorbent junction 70 provided with the adhesive material is difficult to transmit bodily fluid, and the non-absorbent junction section without the adhesive material easily transmits bodily fluid. The non-absorbent junction is a portion other than the absorptive junction 70 . According to this embodiment, the bodily fluid absorbed by the upper absorbent body 35 can be diffused in one direction at the non-absorbent junction between the absorptive junctions 70, and the bodily fluid can be absorbed over a large area. While the bodily fluid is diffused in the width direction (W) by the non-absorbable joint, diffusion can be suppressed by the absorbent joints 70 disposed on both sides of the non-absorbable joint in the longitudinal direction (L). Due to excessive diffusion of body fluid between the upper absorber 35 and the lower absorber 36, accumulation of the liquid at the separated portion between the upper absorber 35 and the lower absorber 36 is suppressed, and the lower absorber 36 The inflow of bodily fluid to the side can be continued.

The absorbent bonding portion 70 may be provided in an area that does not overlap with 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 strongly formed, and the rigidity of the upper absorbent body 35 in the region overlapping the fold line FL is increased. However, since the absorbent bonding portion 70 and the fold line FL do not overlap, the local increase in rigidity of the upper absorbent body 35 can be suppressed. Due to the local increase in the rigidity of the upper absorbent layer 35, the expansion of the super absorbent polymer 32 is not hindered, the super absorbent polymer 32 is easily swelled, and the absorbent performance can be maintained.

The upper absorber 35 may overlap 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 outside the fold line FL in the longitudinal direction L. In this embodiment, one end of the upper layer absorbent body 35 in the longitudinal direction L is located outside the first fold line FL1 in the longitudinal direction L, and the upper layer absorbent body 35 in the longitudinal direction L The other end 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 bonded to the lower absorbent body 36 and is easily moved during folding in the manufacturing process or unfolding in the mounting process. As the outer region R15 moves, the superabsorbent polymer 32 in the upper absorbent body 35 is easily diffused, so that body fluid 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 in which neither the absorbent bonding portion 70 nor the adhesive portion 50 overlaps in the thickness direction T. The non-overlapping portion R20 does not overlap with any of the absorbent bonding portion 70 and the adhesive portion 50, and air permeability and dryness can be secured. The moisture content of the entire absorbent article can be reduced, and the wearing feeling can be improved.

As mentioned above, although this invention was demonstrated in detail using the above-mentioned embodiment, it is clear for those skilled in the art that this invention is not limited to the embodiment demonstrated in this specification. The present invention can be implemented as modifications and changes without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description in this specification is for the purpose of illustrative explanation, and does not have any limiting meaning with respect to the present invention.

All contents of Japanese Patent Application No. 2019-121743 filed on June 28, 2019 are incorporated herein by reference.

According to the present invention, it is possible to provide an absorbent article that suppresses gel blocking and readily absorbs body fluids continuously.

1: absorbent article
1E: extension
10: surface sheet
20: back sheet
30: absorber
31: hydrophilic fiber
32: super absorbent polymer
33: heat-sealable fiber
35: upper absorber
36: lower layer absorber
50: adhesive part
70: absorption junction
L: longitudinal direction
T: thickness direction
T1: skin facing side
T2: skin non-opposite side
W: width direction

Claims (9)

A longitudinal direction and a width direction orthogonal to each other;
A liquid-permeable surface sheet;
A liquid impermeable back sheet;
An absorbent article having an absorbent body disposed between the topsheet and the backsheet and having at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent layer having at least the hydrophilic fibers and a lower absorbent layer disposed on a non-skin facing side of the upper absorbent layer,
The lower absorbent body has an extended area extending from the upper absorbent body in the longitudinal direction and the width direction,
The basis weight of the superabsorbent polymer exposed to the skin facing surface of the upper absorbent layer is smaller than the basis weight of the superabsorbent polymer exposed to the skin facing surface of the extended region,
The absorber has a heat-sealable fiber,
The absorbent article according to claim 1 , wherein the heat-sealable fibers are disposed only in the lower absorbent layer among the upper absorbent layer and the lower absorbent layer. A longitudinal direction and a width direction orthogonal to each other;
A liquid-permeable surface sheet;
A liquid impermeable back sheet;
An absorbent article having an absorbent body disposed between the topsheet and the backsheet and having at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent layer having at least the hydrophilic fibers and a lower absorbent layer disposed on a non-skin facing side of the upper absorbent layer,
The lower absorbent body has an extended area extending from the upper absorbent body in the longitudinal direction and the width direction,
The basis weight of the superabsorbent polymer exposed to the skin facing surface of the upper absorbent layer is smaller than the basis weight of the superabsorbent polymer exposed to the skin facing surface of the extended region,
the extension region has a first region disposed on the upper absorbent body side and a second region disposed on the outer edge side of the absorbent article;
The absorbent article of claim 1 , wherein the basis weight of the super absorbent polymer exposed to the skin facing surface of the first region is greater than that of the super absorbent polymer exposed to the skin facing surface of the second region. A longitudinal direction and a width direction orthogonal to each other;
A liquid-permeable surface sheet;
A liquid impermeable back sheet;
An absorbent article having an absorbent body disposed between the topsheet and the backsheet and having at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent layer having at least the hydrophilic fibers and a lower absorbent layer disposed on a non-skin facing side of the upper absorbent layer,
The lower absorbent body has an extended area extending from the upper absorbent body in the longitudinal direction and the width direction,
The basis weight of the superabsorbent polymer exposed to the skin facing surface of the upper absorbent layer is smaller than the basis weight of the superabsorbent polymer exposed to the skin facing surface of the extended region,
The upper absorbent layer and the lower absorbent layer have an absorbent joint joined by an adhesive material,
the absorbent article is folded from a pair of fold lines extending in the width direction;
The upper absorbent body has an outer region disposed outside the fold line in the longitudinal direction,
The absorbent article according to claim 1 , wherein the absorbent bonding portion is provided in a region that does not overlap with the outer region. The absorbent article according to claim 3, wherein the absorbent bonding portion is provided in a region that does not overlap with the pair of fold lines. A longitudinal direction and a width direction orthogonal to each other;
A liquid-permeable surface sheet;
A liquid impermeable back sheet;
An absorbent article having an absorbent body disposed between the topsheet and the backsheet and having at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent layer having at least the hydrophilic fibers and a lower absorbent layer disposed on a non-skin facing side of the upper absorbent layer,
The lower absorbent body has an extended area extending from the upper absorbent body in the longitudinal direction and the width direction,
The basis weight of the superabsorbent polymer exposed to the skin facing surface of the upper absorbent layer is smaller than the basis weight of the superabsorbent polymer exposed to the skin facing surface of the extended region,
The upper absorbent layer and the lower absorbent layer have an absorbent bonding portion bonded by an adhesive material, and an adhesive portion provided with an adhesive for bonding the non-skin facing surface of the absorbent article to a wearable article,
An absorbent article having a non-overlapping portion in which neither the absorbent bonding portion nor the adhesive portion overlaps in a thickness direction. A longitudinal direction and a width direction orthogonal to each other;
A liquid-permeable surface sheet;
A liquid impermeable back sheet;
An absorbent article having an absorbent body disposed between the topsheet and the backsheet and having at least hydrophilic fibers and a superabsorbent polymer,
The absorbent body has an upper absorbent layer having at least the hydrophilic fibers and a lower absorbent layer disposed on a non-skin facing side of the upper absorbent layer,
The lower absorbent body has an extended area extending from the upper absorbent body in the longitudinal direction and the width direction,
The basis weight of the superabsorbent polymer exposed to the skin facing surface of the upper absorbent layer is smaller than the basis weight of the superabsorbent polymer exposed to the skin facing surface of the extended region,
The superabsorbent polymer is not disposed in the lower absorbent layer but is disposed in the upper absorbent layer,
The absorbent article according to claim 1 , wherein the superabsorbent polymer overflowing from the upper absorbent layer is disposed in the extended region. The absorbent article according to any one of claims 1 to 6, wherein the upper absorbent layer is an air-laid nonwoven fabric containing the hydrophilic fibers and the superabsorbent polymer. The method according to any one of claims 1 to 6, wherein in the upper absorbent layer, the hydrophilic fibers are disposed on at least a surface on the lower absorbent layer side, and the superabsorbent polymer is disposed on a surface on the lower absorbent layer side. An absorbent article disposed at least on the skin facing surface side of the hydrophilic fibers. The method according to any one of claims 1 to 6, wherein the upper absorbent layer and the lower absorbent layer have an absorbent bonding portion joined by an adhesive material,
The absorbent article according to claim 1 , wherein a plurality of the absorbent joining portions extend in one of the longitudinal direction and the width direction, and are provided at intervals in the other of the longitudinal direction and the width direction.

Images