CN114040738B - Absorbent article - Google Patents

Abstract

To provide an absorbent article that suppresses gel clogging and is easy to continuously absorb body fluids. An absorbent article (1) has a liquid-permeable top sheet (10), a liquid-impermeable back sheet (20), and is disposed between the top sheet and the back sheet and has at least hydrophilic fibers and a superabsorbent polymer The absorber (30). The absorbent body (30) has: an upper layer absorbent body (35) having at least hydrophilic fibers; and a lower layer absorbent body (36) disposed on the non-skin facing side of the upper layer absorbent body. The lower layer absorbent body has a protruding region (R10) protruding in the longitudinal direction and the width direction with respect to the upper layer absorbent body. The weight per unit area of the superabsorbent polymer (32) exposed on the skin-facing side of the upper absorbent body is smaller than that of the superabsorbent polymer (32) exposed on the skin-facing side of the protruding region.

Description

absorbent article

technical field

The present invention relates to absorbent articles such as pantiliners and incontinence pads which are attached to underwear and used.

Background technique

Conventionally, absorbent articles that are attached to underwear and absorb body fluids such as leucorrhea, sweat, and urine have been used. The absorbent article of Patent Document 1 has a top sheet, a back sheet, and an absorbent core which is arranged between the top sheet and the back sheet and has 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 planar area of the absorbent core.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2012-105962

Contents of the invention

The absorbent core of Patent Document 1 is composed mainly of a superabsorbent polymer, and is excellent in retention of body fluids. However, since the superabsorbent polymer is arranged over the entire planar area of the absorbent core, the superabsorbent polymer gels when the body fluid is absorbed, and gel clogging tends to occur. When gel clogging occurs, it may be difficult to continuously absorb body fluid, leakage may occur, and the wearing feeling may deteriorate due to body fluid remaining on the surface.

Therefore, an absorbent article that suppresses gel clogging and is easy to continuously absorb body fluids is desired.

An absorbent article according to one aspect has a longitudinal direction and a width direction perpendicular to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and at least a hydrophilic sheet disposed between the top sheet and the back sheet. Absorbents made of natural fibers and superabsorbent polymers. The absorbent body includes: an upper layer absorbent body having at least the hydrophilic fibers; and a lower layer absorbent body disposed on a non-skin facing side of the upper layer absorbent body. The lower layer absorbent body has a protruding region protruding in the longitudinal direction and the width direction with respect to the upper layer absorbent body. The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the protruding region.

Description of drawings

Fig. 1 is a plan view of an absorbent article according to an embodiment seen from the skin-facing side.

Fig. 2 is a plan view of the absorbent article according to the embodiment seen from the non-skin-facing surface side.

Fig. 3 is a schematic cross-sectional view of the absorbent article shown in Fig. 1 along section A-A.

Fig. 4 is a schematic cross-sectional view of the absorbent article shown in Fig. 1 along the B-B cross section.

Fig. 5 is a plan view showing a joint portion between an upper layer absorbent body and a lower layer absorbent body.

Detailed ways

(1) Outline of Embodiment

From the description of this specification and the drawings, at least the following matters are clarified.

An absorbent article according to one aspect has a longitudinal direction and a width direction perpendicular to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and at least a hydrophilic sheet disposed between the top sheet and the back sheet. Absorbents made of natural fibers and superabsorbent polymers. The absorbent body includes: an upper layer absorbent body having at least the hydrophilic fibers; and a lower layer absorbent body disposed on a non-skin facing side of the upper layer absorbent body. The lower layer absorbent body has a protruding region protruding in the longitudinal direction and the width direction with respect to the upper layer absorbent body. The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the protruding region. According to this aspect, the upper layer absorbent body has hydrophilic fibers, and bodily fluids can be quickly absorbed by the hydrophilic fibers. The bodily fluid introduced from the upper absorbent body spreads in the upper absorbent body and is guided to the lower absorbent body. In this case, since the weight per unit area of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is relatively small, gel clogging at the skin-facing surface of the upper absorbent body can be suppressed, and bodily fluids can be continuously introduced into the upper absorbent body. . In addition, since the superabsorbent polymer in the protruding region of the lower absorbent body has a relatively high basis weight, the superabsorbent polymer in the protruding region retains bodily fluids seeping laterally from the upper absorbent body, thereby suppressing side leakage. The protruding area is offset from the center of the absorbent article where the bodily fluids are discharged. Therefore, even if gel clogging occurs due to the superabsorbent polymer in the protruding area, bodily fluids can be continuously retained.

According to a preferred aspect, 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 introduction property, and also has a high release property of the introduced liquid. Therefore, the bodily fluid discharged to the upper layer absorbent body can be quickly taken in, and the bodily fluid can be quickly guided to the lower layer absorbent body. In addition, since the air-laid nonwoven fabric has high diffusivity in the planar direction, the body fluid introduced into the upper absorbent body can be diffused over a wide range. Thereby, bodily fluids can be held in a large area of the upper layer absorbent body, and bodily fluids can also be easily guided to the protruding region of the lower layer absorbent body. Thereby, gel clogging due to partial absorption of bodily fluid in the upper layer absorbent body can be suppressed.

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

According to a preferred aspect, the absorber may include heat-sealable fibers, and the heat-sealable fibers may be arranged only in the lower layer absorber among the upper layer absorber and the lower layer absorber. Heat-sealable fibers are heated during the manufacturing process to form heat-sealed portions. By forming the heat-sealed portion in the lower layer absorbent body, the binding force between fibers becomes stronger, and the lower layer absorbent body becomes less likely to be twisted. Thereby, the whole absorbent article becomes hard to twist, it can continue to be properly arrange|positioned facing a body, and leakage can be suppressed and uncomfortable feeling can be suppressed. In addition, since heat-sealable fibers are not arranged in the upper absorbent core, no thermally welded portion is formed in the upper absorbent core. The superabsorbent polymer becomes easy to swell without hindering the expansion of the superabsorbent polymer due to the strengthening of the binding force between the fibers, so that the absorbing performance can be maintained.

According to a preferred aspect, the protruding region may have a first region arranged on the side of the upper absorbent body and a second region arranged on the outer edge side of the absorbent article, and the first region The weight per unit area of the superabsorbent polymer exposed on the skin-facing surface of the second region is greater than the weight per unit area 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, bodily fluid can be further retained by the first region positioned inside when the absorbent article is planarly viewed. Bodily fluid becomes less likely to reach the outer edge of the absorbent article, and side leakage can be suppressed.

According to a preferred aspect, there may be an absorbing joint portion provided with an adhesive material for joining the upper layer absorbent body and the lower layer absorbent body, and the absorption joint portion extends along the longitudinal direction and the lower layer absorbent body. One of the width directions extends, and a plurality of them are provided at intervals in the other of the length direction and the width direction. The absorbent joining portion provided with an adhesive material is not easily permeable to body fluids, and the non-absorbent joining portion not provided with an adhesive material is easily permeable to body fluids. According to this aspect, the bodily fluid absorbed by the upper layer absorbent body can be diffused in one direction at the non-absorbent junction part which is the gap between the absorbent junction parts, and the body fluid can be absorbed over a large area. The body fluid can be diffused by the non-absorbent junction, while the absorption junction arranged on both sides of the non-absorbent junction can suppress diffusion in the other direction. It is possible to suppress the accumulation of fluid at the peeled part between the upper absorbent body and the lower absorbent body due to excessive diffusion of bodily fluid between the upper absorbent body and the lower absorbent body, and to continuously introduce bodily fluid to the lower absorbent body side.

According to a preferred aspect, the absorbent article may have an absorbent joining portion formed by joining the upper absorbent core and the lower absorbent core with an adhesive material, and the absorbent article may have a pair of absorbent joints extending in the width direction. The fold line is folded based on the fold line, the upper layer absorbent body has an outer region disposed outside the fold line in the longitudinal direction, and the absorbent junction is provided in a region not overlapping the outer region. The outer region of the upper absorbent body is not joined to the lower absorbent body, and is easy to move during folding during manufacturing and unfolding during wearing. As the outer region moves, the superabsorbent polymer in the upper absorbent body becomes easy to spread, and body fluid can be retained in a wide range of the absorbent body.

According to a preferred aspect, the absorbing joint portion may be provided in a region that does not overlap the pair of folding lines. When the absorbing junction part overlaps with the fold line, more severe creases are formed, and the rigidity of the upper layer absorbent body in the region overlapping with the fold line becomes high. However, since the absorption joining portion does not overlap with the folding line, it is possible to suppress local increase in the rigidity of the upper layer absorbent body. The superabsorbent polymer becomes easy to swell without hindering the expansion of the superabsorbent polymer due to the locally high rigidity of the upper absorbent body, and the absorbency can be maintained.

According to a preferred aspect, it may include: an absorbent joining portion formed by joining the upper layer absorbent body and the lower layer absorbent body with an adhesive material; and an adhesive portion provided for bonding the absorbent The non-skin-facing surface of the article is bonded to the adhesive of the wearing article, and a non-overlapping portion that does not overlap either the absorbing bonding portion or the adhesive portion in the thickness direction is provided. The non-overlapping portion does not overlap with either the absorbent junction portion or the adhesive portion, so that breathability and dryness can be ensured. By having the non-overlapping portion, the stuffiness of the entire absorbent article can be reduced, and the feeling of wearing can be improved.

(2) Overall outline structure of absorbent article

Hereinafter, absorbent articles according to embodiments will be described with reference to the drawings. In addition, in description of the following drawings, the same or similar reference numerals are attached|subjected to the same or similar part. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. In addition, the relationship and the ratio of a mutual dimension may differ between drawings.

The absorbent article is a pantiliner. In addition, the absorbent article of the present invention may be an absorbent article worn on underwear and used, for example, may be an incontinence pad. Fig. 1 is a plan view of an absorbent article 1 according to the present embodiment seen from the skin-facing side. Fig. 2 is a plan view of the absorbent article shown in Fig. 1 as seen from the non-skin facing side. Fig. 3 is a schematic cross-sectional view of the absorbent article shown in Fig. 1 along section A-A. Fig. 4 is a schematic cross-sectional view of the absorbent article shown in Fig. 1 along the B-B cross section.

The absorbent article 1 has a longitudinal direction L and a width direction W which are perpendicular to each other. The length direction L is defined by directions extending toward the front side of the body and the back side of the body. In other words, the longitudinal direction L is a direction extending back and forth in the developed absorbent article 1 . Moreover, the absorbent article 1 has the thickness direction T orthogonal to both the longitudinal direction L and the width direction W. The thickness direction T extends toward the skin-facing surface side T1 facing the wearer and the 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 can be composed of a liquid-permeable sheet such as nonwoven fabric or perforated plastic film. The top sheet 10 may be formed by laminating a plurality of sheets, or may have a second sheet. For example, the surface sheet 10 may be composed of a laminated sheet of a cotton sheet containing cotton fibers and a sheet containing rayon and polyethylene, or may be composed of the laminated sheet and a second sheet formed of an air-through nonwoven fabric. The surface sheet 10 of this embodiment is comprised from an air-through nonwoven fabric. In addition, a cotton sheet may be provided at a position closer to the skin-facing side T1 than the air-through nonwoven fabric. The cotton sheet is in contact with the wearer's skin, thereby improving skin feel.

The back sheet 20 may be composed of a liquid-impermeable sheet such as a plastic film. The back sheet 20 may also have air permeability. The air-permeable backsheet 20 facilitates discharge of moisture to the outside of the absorbent article through the backsheet 20 when urine and sweat are absorbed. Therefore, it is possible to reduce stuffiness and improve wearing comfort. The topsheet 10 and the 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. In addition, the outer edge is an edge of the entire outer periphery including the outer edge, the front end edge, and the rear end edge.

As shown in FIG. 2, the adhesive part 50 for joining the absorbent article 1 to underwear is arrange|positioned on the non-skin facing surface of the back sheet 20. As shown in FIG. The adhesive part 50 is a part provided with the adhesive material which joins the absorbent article 1 to underwear. The adhesive part 50 is extended along the width direction W, and is provided in the longitudinal direction L at intervals. The adhesive portion 50 may not reach the outer edge joint portion 40 described later. That is, the bonding portion 50 and the outer edge joint portion 40 may be separated in plan view. Between the adhesive portion 50 and the outer edge joint portion 40 is provided a portion that is not joined to the wearing article (does not overlap with the adhesive portion) and that does not join the sheets (does not overlap with the outer edge joint portion 40 ). For the portion between the adhesive portion 50 and the outer edge joint portion 40, the thickness tends to become thicker when the superabsorbent polymer 32 expands. Swelling of the superabsorbent polymer is not hindered, and the superabsorbent polymer easily swells to maintain absorbency.

Depending on the user, the outer edge joint portion 40 may be held when wearing the absorbent article 1 . The adhesive part 50 does not reach the outer edge joint part 40, so even if the outer edge joint part 40 is grasped during wearing, it will not contact the adhesive part 50, and it is easy to stick to and remove from the wearing article. In addition, when worn, the outer edge in the width direction of the absorbent article 1 is disposed near the crotch seam of the worn article, and is likely to be deformed by the movement of the wearer. Since the adhesive portion 50 does not reach the outer edge joining portion 40, the side edge of the absorbent article does not directly follow the movement of the wearing article, and deformation of the absorbent article can be suppressed. In addition, the adhesive part 50 may be covered with the wrapping sheet which is not shown in figure before using an absorbent article. In addition, in a modified example, a plurality of adhesive portions 50 may extend along the longitudinal direction L and be provided at intervals in the width direction W, or may reach the outer edge joint portion 40 .

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

The absorbent article 1 can be folded based on a pair of folding lines FL extending along the width direction W before use. The pair of folding lines FL includes a first folding line FL and a second folding line FL2 arranged at a distance from the first folding line FL1 in the longitudinal direction L.

At least the outer edge joining portion 40 formed by joining the top sheet 10 and the back sheet 20 may be provided along the outer edge 1E of the absorbent article 1 . In the outer edge joining portion 40, at least the top sheet 10 and the back sheet 20 may be joined, and the absorber 30 may be joined. The outer edge joint 40 may reach the outer edge 1E of the absorbent article 1 . The outer edge joint portion 40 may be formed by any one of thermal welding, ultrasonic welding, and embossing. The outer edge joining portion 40 of the present embodiment is formed by joining the topsheet 10, the backsheet 20, and the lower layer absorbent core 36 described later by embossing. The outer edge joint part 40 formed by embossing is provided on the outer edge 1E of the absorbent article 1, so that even if the body fluid reaches the outer edge of the absorbent article 1, the body fluid can be retained in the outer edge joint part 40 having a high density. , to suppress side leakage. In addition, when the outer edge of the outer edge joint part 40 coincides with the outer edge of the absorbent article 1, the area inside the outer edge joint part 40 (the area where the sheets are not joined to the lower layer absorbent body) can be ensured to be large, Therefore, it is possible to suppress the hindrance of the expansion of the superabsorbent polymer 32 . In addition, the outer edge joint portion 40 is shown in FIGS. 1 and 2 , and is omitted in the cross-sectional views of FIGS. 3 and 4 for convenience of illustration.

Next, the absorber 30 will be described in detail. The absorbent body 30 has the upper layer absorbent body 35 and the lower layer absorbent body 36 arrange|positioned rather than the upper layer absorbent body 35 at the non-skin facing surface side T2. The area of the lower layer absorbent body 36 is larger than the area of the upper layer absorbent body 35 . The lower layer absorbent body 36 has a protruding region R10 protruding from the upper layer absorbent body 35 in plan view. The protruding region R10 is a hatched region in FIG. 5 . The lower layer absorbent body 36 is arranged on the entire 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 layer absorbent body 35 has a rectangular shape in plan view, and straddles the center in the width direction W and the center in the longitudinal direction L of the absorbent article 1 . The outer edge of the upper layer absorbent body 35 is located on the inner side in the width direction W than the outer edge of the absorbent article 1 . In the longitudinal direction L, the outer edge of the upper layer absorbent body 35 is located inside the outer edge of the absorbent article 1 . Accordingly, the overhanging regions R10 are provided on the outside of the upper layer absorbent body 35 in the longitudinal direction L and on the outside of the upper layer absorbent body 35 in the width direction W, respectively. The overhang region R10 is a region between the outer edge of the upper layer absorbent body 35 and the outer edge 1E of the absorbent article.

The overhang region R10 may have a first region R11 arranged on the upper absorbent core 35 side and a second region R12 arranged on the outer edge side of the absorbent article. The first region R11 is a region arranged on the side of the upper layer absorbent body 35 among the regions bisecting the overhang region R10 in the longitudinal direction L or the width direction W. In FIG. 5 , the boundary between the first region R11 and the second region R12 is indicated by a dashed-dotted line. The boundary between the first region R11 and the second region R12 in the present embodiment is a line connecting the outer edge of the upper layer absorbent body 35 and the middle point of the outer edge of the absorbent article 1 .

The upper layer absorbent body 35 has at least the hydrophilic fiber 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 overhang 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 surfaces on the skin-facing side T1 of each absorbent body, and are surfaces facing the top sheet. In addition, the superabsorbent polymer 32 exposed on the skin-facing surface of the protruding region R10 of the lower absorbent body 36 may be arranged more than the superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35. There is no superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 . Alternatively, the superabsorbent polymer 32 may not be disposed in the upper absorbent body 35 and the lower absorbent body 36, and superabsorbent polymers may be disposed on the skin-facing surface of the upper absorbent body 35 and the skin-facing surface of the lower absorbent body 36. Sexual polymer32. In the present embodiment, the superabsorbent polymer 32 is arranged 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 superabsorbent polymer 32 is not arranged in the lower layer absorbent body 36 , and the superabsorbent polymer 32 leaked from the upper layer absorbent body 35 is exposed in the protruding region R10 of the lower layer absorbent body 36 . In addition, in the case 30 where the lower absorbent body 36 extends to the outer edge of the absorbent article, it is preferable that, in order to prevent the superabsorbent polymer 32 from leaking from the outer edge 1E of the absorbent article 1, the side edge portion of the absorbent body The superabsorbent polymer 32 is not arranged, and it is more preferable that the superabsorbent polymer 32 is not arranged in the lower layer 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 in the central part of the absorbent body), in order to ensure the water retention capacity of the entire absorbent article, The superabsorbent polymer 32 may also be arranged in the lower layer absorbent body 36 . In addition, in the present embodiment, the mass of the superabsorbent polymer 32 of the lower layer absorbent body 36 may be lower than the mass of the superabsorbent polymer 32 of the upper layer absorbent body 35 .

In the comparison of the weight per unit area of the superabsorbent polymer 32, colored water was dropped, and in the state where the superabsorbent polymer 32 of the upper layer absorbent body 35 and the superabsorbent polymer 32 of the protruding region R10 absorbed water, the water was passed through the target. Visually to confirm the difference in color. A region with a thick 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 weight per unit area of the superabsorbent polymer 32 . As another method of comparing the weight per unit area of the superabsorbent polymer 32, it is possible to immerse in colored water for about 30 minutes, measure the number of superabsorbent polymers 32 that swell by absorbing the colored water, and compare the superabsorbent polymers. 32 weight per unit area. In addition, the weight per unit area of the superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 does not include the weight per unit area of all the superabsorbent polymer 32 of the upper absorbent body 35 . The basis weight of the superabsorbent polymer 32 exposed only on the skin-facing surface of the upper-layer absorbent body 35 of the superabsorbent polymer 32 not exposed on the skin-facing surface of the upper-layer absorbent body 35 . Similarly, the weight per unit area of the superabsorbent polymer 32 exposed on the skin-facing surface of the protruding region R10 of the lower absorbent body 36 does not include the superabsorbent polymer 32 not exposed on the skin-facing surface of the lower absorbent body 36. The weight per unit area of the superabsorbent polymer 32 exposed only on the skin-facing surface of the lower layer absorbent body 36 .

According to this structure, the hydrophilic fiber 31 of the upper layer absorbent body 35 can draw in a bodily fluid rapidly. The bodily fluid introduced into the upper absorbent body 35 spreads in the upper absorbent body 35 and is guided to the lower absorbent body 36 . At this time, since the weight per unit area of the superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 is relatively small, gel clogging at the skin-facing surface of the upper absorbent body 35 can be suppressed, and the upper absorbent body 35 can be Continuous introduction of body fluids. If the basis weight of the superabsorbent polymer 32 exposed on the skin-facing side of the upper absorbent body 35 is relatively large, transfer of bodily fluids from the skin-facing non-skin side of the upper absorbent body 35 may be hindered. However, since the weight per unit area of the superabsorbent polymer 32 exposed on the skin-facing surface of the upper absorbent body 35 is relatively small, bodily fluids can be continuously introduced into the upper absorbent body 35, and it is possible to suppress the accumulation of bodily fluids on the upper absorbent body 35. resulting in discomfort and foreign body sensation. In addition, the basis weight of the superabsorbent polymer 32 in the overhanging region R10 of the lower absorbent body 36 is relatively large, and the superabsorbent polymer 32 in the overhanging region R10 retains body fluids that seep out from the upper absorbent body 35 laterally. , can suppress side leakage. The overhang region R10 is offset from the center of the absorbent article 1 where bodily fluids are discharged. Therefore, even if gel clogging occurs due to the superabsorbent polymer 32 protruding from the region R10, bodily fluids can be continuously retained.

The weight per unit area of the superabsorbent polymer 32 exposed on the skin-facing surface of the first region R11 of the protruding region R10 may be greater than the weight per unit area of the superabsorbent polymer 32 exposed on the skin-facing surface of the second region R12. A lot of weight. Since the basis weight of the superabsorbent polymer 32 in the first region R11 is relatively large, bodily fluid can be further retained by the first region R11 inside the absorbent article 1 in plan view. Bodily fluid becomes less likely to reach the outer edge 1E of the absorbent article 1, and side leakage can be suppressed. The second region R12 is in contact with a region that is prone to perspiration away from the excretion part. The second region R12 can reliably absorb sweat with a smaller amount of water discharge than excrement. In addition, 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 due to unevenness when the superabsorbent polymer 32 expands.

The upper absorbent body 35 may be an air-laid nonwoven fabric containing the hydrophilic fibers 31 and the superabsorbent polymer 32 . The air-laid nonwoven fabric has a high liquid introduction property, and also has a high release property of the introduced liquid. Therefore, the bodily fluid discharged to the upper layer absorbent body 35 can be quickly taken in, and the bodily fluid can be quickly guided to the lower layer absorbent body 36 . In addition, since the air-laid nonwoven fabric has high diffusivity in the planar direction, the bodily fluid introduced into the upper layer absorbent body 35 can be diffused over a wide range. Thereby, the upper layer absorbent body 35 can hold bodily fluids in a relatively large area, and it is also easy to guide the bodily fluids to the protruding region R10 of the lower layer absorbent body 36 . Thereby, localized gel clogging of the upper layer absorbent body 35 due to absorption of body fluid 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 setting the area of the lower layer absorbent body 36 large, the absorption capacity can be ensured. In addition, bodily fluids are retained by the superabsorbent polymer 32 exposed in the overhang region R10 , so that the bodily fluids can be suppressed 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 disposed at least on the surface on the lower absorbent body 36 side, and the superabsorbent polymer 32 is disposed at least closer to the skin than the hydrophilic fibers 31 disposed on the lower absorbent body 36 side surface. The position on the opposite side of T1. By the hydrophilic fibers 31 located on the non-skin-facing side T2 of the superabsorbent polymer 32 , bodily fluids not completely absorbed by the superabsorbent polymer 32 of the upper absorbent body 35 can be drawn in and absorbed. By introducing bodily fluids to the non-skin-facing surface side T2 in the upper layer absorbent body 35, the bodily fluids can be smoothly guided to the lower layer absorbent body 36. FIG.

In the absorber 30, the density of the superabsorbent polymer 32 may be constant or may vary. As shown in FIG. 3 , the upper layer absorbent body 35 has a central region 35RC including the center in the thickness direction of the upper layer absorbent body 35 and a surface side region 35RS located outside the central region 35RC in the thickness direction. The boundary between the central region 35RC and the surface side region 35RS is a boundary that divides the upper layer absorber 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 relatively high, the central region 35RC tends to swell when absorbing body fluids. Thereby, the absorption capacity of bodily fluid can be ensured. In addition, since the density of the superabsorbent polymer 32 in the surface side region 35RS is low, gel clogging is less likely to occur when absorbing body fluids, and the absorbability of body fluids can be maintained. In addition, as a method of measuring the density, the absorber can be cut in a cross-section along the thickness direction, the cross-section can be photographed with an electron microscope, and the number of superabsorbent polymers 32 contained in the same area in each region can be measured, It was determined that the larger the number, the higher the density. In addition, as another method of measuring the number of superabsorbent polymers 32, immersion in colored water for about 30 minutes can be used to measure the number of superabsorbent polymers 32 that swell by absorbing the colored water. The higher the density.

The absorber 30 may have heat-sealable fibers 33 . The heat-sealable fiber 33 may be arranged only in the lower layer absorbent body 36 among the upper layer absorbent body 35 and the lower layer absorbent body 36 . That is, the heat-fusible fibers 33 may not be disposed on the upper absorbent body 35 . The heat-sealable fibers 33 are heated during the manufacturing process to form a heat-sealed portion. By forming the heat-sealed portion in the lower layer absorbent body 36, the bonding force between the fibers becomes stronger, and the lower layer absorbent body 36 becomes less likely to be twisted. Thereby, the whole absorbent article becomes hard to twist, it can continue to be properly arrange|positioned facing a body, and leakage can be suppressed and uncomfortable feeling can be suppressed. In addition, since the heat-sealable fiber 33 is not arrange|positioned in the upper layer absorbent body 35, the heat-sealed part is not formed in the upper layer absorbent body 35. The expansion of the superabsorbent polymer 32 is not hindered by the strengthening of the binding force between fibers, and the superabsorbent polymer 32 becomes easy to swell, and the absorbing performance can be maintained.

The upper absorber 35 of the present embodiment is an air-laid nonwoven fabric having hydrophilic fibers 31, binders (bonding materials), hydrophilic agents, and superabsorbent polymers 32, and the lower absorber 36 is an air-laid nonwoven fabric with adhesives. agent (bonding material), hydrophilic agent, heat-fusible fiber 33 air-laid non-woven fabric. The airlaid nonwoven fabric of the lower layer absorbent body 36 does not have the superabsorbent polymer 32, and the superabsorbent polymer 32 is placed on the airlaid nonwoven fabric.

The absorbent article 1 has an absorbent joining portion 70 in which the upper absorbent body 35 and the lower absorbent body 36 are joined. FIG. 5 is a plan view showing the absorbent joining portion 70 of the upper absorbent body 35 and the lower absorbent body 36 . The absorbing joining portion 70 may extend along one of the longitudinal direction L and the width direction W, and may be provided in plural at intervals in the other direction of the longitudinal direction L and the width direction W. The absorption junction part 70 of this embodiment may extend along the width direction W, and may be provided in the longitudinal direction L at intervals. In addition, in a modified example, the absorbing joining portion 70 may extend along the longitudinal direction L and may be provided in a plurality in the width direction W at intervals. In addition, the absorption joining portion 70 may extend in the same direction as the adhesive portion 50 and may be arranged at intervals in the same direction as the adhesive portion 50 .

The absorbent joining portion 70 provided with an adhesive material is less likely to permeate body fluids, and the non-absorbent joining portion 70 not provided with an adhesive material is more likely to allow bodily fluids to pass through. The non-absorbent junction part is a part other than the absorption junction part 70 . According to this aspect, the bodily fluid absorbed by the upper layer absorbent body 35 can be diffused in one direction at the non-absorbent junction part between the absorbent junction parts 70, and can absorb the bodily fluid over a large area. Bodily fluid can be diffused in the width direction W by the non-absorbent junction, while diffusion can be suppressed by the absorbent junction 70 arranged on both sides in the longitudinal direction L with respect to the non-absorbent junction. It is possible to suppress the accumulation of fluid at the peeled part between the upper absorbent body 35 and the lower absorbent body 36 due to excessive diffusion of bodily fluid between the upper absorbent body 35 and the lower absorbent body 36, and to continuously introduce bodily fluid to the lower absorbent body 36 side.

The absorption junction part 70 may be provided in the area|region which does not overlap with a pair of folding line FL of the absorbent article 1. As shown in FIG. When the absorbent joining portion 70 overlaps the fold line FL, a more severe crease is formed, and the rigidity of the region of the upper layer absorbent body 35 overlapping the fold line FL becomes high. However, since the absorption junction part 70 does not overlap with the fold line FL, it can suppress that the rigidity of the upper layer absorbent body 35 becomes high locally. The superabsorbent polymer 32 becomes easy to swell without hindering the expansion of the superabsorbent polymer 32 due to the rigidity of the upper layer absorbent body 35 being locally increased, and the absorbing performance can be maintained.

The upper layer absorbent body 35 may overlap with at least one of the pair of folding lines FL. As shown in FIG. 5 , the upper layer absorbent body 35 has an outer region R15 arranged on the outer side in the longitudinal direction L than the folding line FL. 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 other end of the upper layer absorbent body 35 in the longitudinal direction L coincides with the second fold line FL2. . Thereby, the outer region R15 of the upper layer absorbent body 35 is provided in the outer side of the longitudinal direction L rather than the 1st folding line FL1. The outer region R15 is not joined to the lower layer absorbent body 36 and is easy to move during folding during the manufacturing process and during unfolding during the wearing process. As the outer region R15 moves, the superabsorbent polymer 32 in the upper layer absorbent body 35 tends to spread, and bodily fluids can be held in a wide range of the absorbent body.

As shown in FIG. 4 , the absorbent article 1 is provided with a non-overlapping portion R20 that does not overlap any of the absorbent junction portion 70 and the adhesive portion 50 in the thickness direction T. As shown in FIG. The non-overlapping portion R20 does not overlap any of the absorbent junction portion 70 and the adhesive portion 50, and air permeability and dryness can be ensured. The stuffiness 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 said embodiment, it is clear for those skilled in the art that this invention is not limited to embodiment demonstrated in this specification. The present invention can be implemented as a modified or changed form without departing from the spirit and scope of the present invention defined by the claims. Therefore, the purpose of description in this specification is an illustration, and it does not have any restrictive meaning to this invention.

In addition, the entire contents of Japanese Patent Application No. 2019-121743 filed on June 28, 2019 are incorporated into this specification by reference.

Industrial availability

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

Explanation of reference signs

1. Absorbent article; 1E, outer edge; 10, surface sheet; 20, back sheet; 30, absorber; 31, hydrophilic fiber; 32, superabsorbent polymer; 33, heat-sealable fiber; 35, Upper absorber; 36, lower absorber; 50, adhesive part; 70, absorbing joint; L, length direction; T, thickness direction; T1, skin-facing side; T2, non-skin-facing side; W, width direction.

Claims (9)

1. An absorbent article comprising a longitudinal direction and a width direction perpendicular to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and at least An absorbent body having hydrophilic fibers and a superabsorbent polymer, wherein, The absorbent body includes: an upper layer absorbent body having at least the hydrophilic fibers; and a lower layer absorbent body disposed on a non-skin facing side of the upper layer absorbent body, The lower layer absorbent body has a protruding region protruding in the longitudinal direction and the width direction with respect to the upper layer absorbent body, The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the protruding region, The absorbent article has an absorbent joining portion in which the upper absorbent body and the lower absorbent body are joined by an adhesive material, The absorbent article is folded based on a pair of folding lines extending along the width direction, The upper absorbent body has an outer region disposed on the outer side in the longitudinal direction than the folding line, The absorbent junction is provided in a region that does not overlap the outer region. 2. The absorbent article according to claim 1, wherein: The absorbing junction is provided in a region that does not overlap the pair of folding lines. 3. An absorbent article having a longitudinal direction and a width direction perpendicular to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and at least An absorbent body having hydrophilic fibers and a superabsorbent polymer, wherein, The absorbent body includes: an upper layer absorbent body having at least the hydrophilic fibers; and a lower layer absorbent body disposed on a non-skin facing side of the upper layer absorbent body, The lower layer absorbent body has a protruding region protruding in the longitudinal direction and the width direction with respect to the upper layer absorbent body, The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the protruding region, This absorbent article has: an absorption joining portion formed by joining the upper layer absorbent body and the lower layer absorbent body with an adhesive material; Adhesives for surface bonding to articles of clothing, The absorbent article is provided with a non-overlapping portion that does not overlap either the absorbent junction portion or the adhesive portion in the thickness direction. 4. An absorbent article comprising a longitudinal direction and a width direction perpendicular to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and at least An absorbent body having hydrophilic fibers and a superabsorbent polymer, wherein, The absorbent body includes: an upper layer absorbent body having at least the hydrophilic fibers; and a lower layer absorbent body disposed on a non-skin facing side of the upper layer absorbent body, The lower layer absorbent body has a protruding region protruding in the longitudinal direction and the width direction with respect to the upper layer absorbent body, The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the protruding region, The superabsorbent polymer is arranged not in the lower absorbent body but in the upper absorbent body, The superabsorbent polymer leaked from the upper absorbent body is arranged on the skin-facing surface of the protruding region. 5. An absorbent article comprising a longitudinal direction and a width direction perpendicular to each other, a liquid-permeable top sheet, a liquid-impermeable back sheet, and at least An absorbent body having hydrophilic fibers and a superabsorbent polymer, wherein, The absorbent body includes: an upper layer absorbent body having at least the hydrophilic fibers; and a lower layer absorbent body disposed on a non-skin facing side of the upper layer absorbent body, The lower layer absorbent body has a protruding region protruding in the longitudinal direction and the width direction with respect to the upper layer absorbent body, The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the upper absorbent body is smaller than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the protruding region, The protruding region has a first region disposed on the upper absorber side and a second region disposed on the outer edge side of the absorbent article, The basis weight of the superabsorbent polymer exposed on the skin-facing surface of the first region is larger than the basis weight of the superabsorbent polymer exposed on the skin-facing surface of the second region. 6. The absorbent article according to any one of claims 1 to 5, wherein: The absorber has heat-fusible fibers, The heat-sealable fibers are arranged only in the lower layer absorbent body among the upper layer absorbent body and the lower layer absorbent body. 7. The absorbent article according to any one of claims 1 to 5, wherein: The upper absorbent body is an air-laid nonwoven fabric containing the hydrophilic fibers and the superabsorbent polymer. 8. The absorbent article according to any one of claims 1 to 5, wherein: In the upper absorbent body, the hydrophilic fibers are arranged at least on the surface on the lower absorbent body side, and the superabsorbent polymer is arranged on at least the side of the upper absorbent body that is arranged on the lower absorbent body side surface. The hydrophilic fibers are located on the opposite side of the skin. 9. The absorbent article according to any one of claims 1 to 5, wherein The absorbent article has an absorbent joining portion in which the upper absorbent body and the lower absorbent body are joined by an adhesive material, The absorption junction part extends along one of the longitudinal direction and the width direction, and is provided in plurality at intervals in the other direction of the length direction and the width direction.

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