TW201940144A - Absorbent article - Google Patents

Abstract

Provided is an absorbent article which is capable of suppressing the leakage of bodily fluids by being continuously worn on a suitable position of the body, while reducing sweat accumulation and being more comfortable when worn. This absorbent article (1) has a longitudinal direction (L) and a width direction (W) which are perpendicular to each other, and has: a liquid-permeable surface sheet (10); an air-permeable and liquid-impermeable rear sheet (20); an absorbent body having at least a pulp (31) and a highly absorbent polymer (32); and an adhesive section (50) disposed in a non-skin-facing surface of the rear sheet. The outer edge of the absorbent body is located further inside than the outer edge of the absorbent article. In an outer region (RO) between the outer edge of the absorbent body and the outer edge of the absorbent article, an overlap section (PI) is provided in which the highly absorbent polymer and the adhesive section are disposed overlapping in the thickness direction.

Description

Absorbent article

The present invention relates to an absorbent article used for wearing intimate clothing, such as a pad, a slight incontinence pad, and the like.

Conventionally, absorbent articles which are worn on intimate clothing and absorb body fluids such as secretions, sweat, and urine have been used. The absorbent article of Patent Document 1 includes a top sheet, a back sheet, an absorber disposed between the top sheet and the back sheet and having at least pulp and a superabsorbent polymer, and a non-skin facing surface arranged on the back sheet. Adhesive part. The back sheet of Patent Document 1 is composed of a non-air-permeable or air-permeable film (Patent Document 1 specification paragraph 0019).
[Prior technical literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-154881

Patent Document 1 describes that by forming the back sheet with an air-permeable film, it is possible to reduce stuffiness. However, an adhesive portion is provided on the non-skin facing surface of the back sheet, and moisture may reach the adhesive portion through the air-permeable back sheet. If moisture reaches the adhesive part, the adhesive force of the adhesive part may become weak. As a result, absorbent articles may inadvertently shift to the undergarment and cannot continue to be put in place on the body, resulting in leakage of body fluids.

Therefore, it is desired to develop an absorbent article which can reduce the stuffiness and improve the wearing feeling, and can continuously wear the body in an appropriate position, thereby suppressing the leakage of body fluids.

One aspect of the absorbent article includes: a longitudinal direction and a width direction orthogonal to each other; a liquid-permeable surface sheet; an air-permeable and liquid-impermeable back sheet; and disposed between the front sheet and the back sheet An absorbent having at least a pulp and a superabsorbent polymer; and an absorbent article disposed on the non-skin-facing adhesive portion of the back sheet, wherein the outer edge of the absorbent article is located above the absorbent The outer edge of the absorbent article is more inward, and an overlap between the outer edge of the absorbent body and the outer edge of the absorbent article is provided with the adhesive portion and the superabsorbent polymer overlapping in the thickness direction. unit.

(1) Outline of the embodiment At least the following matters can be made clearer based on the description in this specification and the drawings.
One aspect of the absorbent article includes: a longitudinal direction and a width direction orthogonal to each other; a liquid-permeable surface sheet; an air-permeable and liquid-impermeable back sheet; and disposed between the front sheet and the back sheet An absorbent having at least a pulp and a superabsorbent polymer; and an absorbent article disposed on the non-skin-facing adhesive portion of the back sheet, wherein the outer edge of the absorbent article is located above the absorbent The outer edge of the absorbent article is more inward, and an overlap between the outer edge of the absorbent body and the outer edge of the absorbent article is provided with the adhesive portion and the superabsorbent polymer overlapping in the thickness direction. unit.

According to this aspect, a superabsorbent polymer is arrange | positioned in the area | region where an absorber is arrange | positioned, and an outer area. Therefore, even when urine is discharged over the absorbent body, urine or the like can be held by the superabsorbent polymer in the outer region. In addition, since the back sheet is breathable, when urine, sweat, etc. are absorbed, it is easy to discharge moisture out of the absorbent article through the back sheet. Therefore, the stuffiness can be reduced and the feeling of wearing can be improved. In the outer region, an overlapping portion where the superabsorbent polymer and the adhesive portion overlap in the thickness direction is provided. When the body fluid reaches the overlapping portion, the body fluid is held by the superabsorbent polymer, and the body fluid does not easily reach the back sheet. Therefore, in the adhesive portion of the overlapping portion, moisture from the back sheet side is hard to reach, and the adhesive force can be maintained. The body can be continuously worn in an appropriate position, and body fluid leakage can be suppressed.

According to an ideal aspect, a non-arranged portion in which the aforementioned superabsorbent polymer and the aforementioned adhesive portion are not arranged may be provided in the outer region.

According to this aspect, the non-arranged portion is not provided with the superabsorbent polymer and the adhesive portion, and therefore has higher air permeability than the portion provided with the superabsorbent polymer and the portion provided with the adhesive portion. The non-arranged portion can ensure air permeability. Therefore, it can further reduce the stuffiness and improve the wearing feeling.

In another aspect of the absorbent article, a polymer disposition portion in which the aforementioned superabsorbent polymer is disposed and in which the adhesive portion is not disposed may be disposed in the outer region.

According to this aspect, since the polymer disposition portion is a portion which does not have an adhesive portion and is easy to move to the undergarment, the superabsorbent polymer is easily deformed (expanded). The superabsorbent polymer disposed in the polymer disposition portion is easier to swell than the superabsorbent polymer disposed in the overlapping portion, and can ensure the absorption performance of body fluids.

According to an ideal aspect, an adhesive disposition portion in which the adhesive portion is disposed and not in which the super absorbent polymer is disposed may be provided in the outer region, and the adhesive disposition portion and the polymer disposition portion are in a plan view. Adjoin.

According to this aspect, the superabsorbent polymer in the polymer placement portion can absorb not only body fluids reaching the polymer placement portion, but also surrounding moisture. Therefore, it is possible to reduce the moisture in the adhesive placement portion adjacent to the polymer placement portion. In the adhesive placement portion, air can be transmitted without allowing moisture to pass through, and the adhesive force of the adhesive portion can be maintained.

According to an ideal aspect, the outer region may include the first region on the absorber side and the second region on the outer edge side of the absorbent article, and the superabsorbent polymer in the first region. The density is higher than the density of the superabsorbent polymer in the second region.

According to this aspect, the density of the first region-based superabsorbent polymer is high, and it is possible to hold body fluids that cannot be completely held by the absorbent body. The second area is an area that is prone to sweat that is separated from the excretory part. The second region can surely absorb sweat with less water discharge than excrement. In addition, since the density of the superabsorbent polymer in the second region is low, it is possible to reduce the discomfort caused to the skin by the unevenness when the superabsorbent polymer swells.

According to an ideal aspect, the absorption system may include a central region including a center in the thickness direction of the absorber and a surface-side region located closer to the outer side in the thickness direction than the central region, in the central region. The density of the superabsorbent polymer is higher than the density of the superabsorbent polymer in the surface-side region.

According to an ideal aspect, the hydrophilicity of the skin-facing surface side of the absorbent body may be higher than that of the non-skin-facing surface side of the absorbent body.

According to this aspect, since the skin-facing side of the absorbent body has high hydrophilicity, the body fluid discharged to the surface sheet can be quickly absorbed, and the body fluid can be retained by absorbing the superabsorbent polymer in the body. In addition, since the hydrophilicity of the non-skin-facing side of the absorber is low, it is difficult for body fluids in the absorber to reach the back sheet. Therefore, it is difficult for the water in the body fluid to reach the adhesive part, and it is possible to suppress a decrease in the adhesive force due to the arrival of the water, and to suppress the displacement of the absorbent article.

According to this aspect, the density of the superabsorbent polymer in the central region is high, and when the body fluid is absorbed, the central region is liable to swell. Therefore, the absorption capacity of a body fluid can be ensured. In addition, the density of the superabsorbent polymer in the surface-side region is low, and when the body fluid is absorbed, the surface-side region is less likely to swell. In the surface region, unevenness due to swelling of the superabsorbent polymer is difficult to be formed, so that the unevenness of the absorbent body is not easily transmitted to the top sheet, the back sheet, and the like located outside the thickness direction of the absorber. It can reduce the discomfort when wearing the surface sheet, back sheet, etc. due to the unevenness.

According to an ideal aspect, a press section that compresses at least the front sheet and the back sheet in the thickness direction may be provided in the outer region, and the press section is arranged along the outer edge of the absorbent article. .

According to this aspect, even if the body fluid reaches the press section, the body fluid diffuses in the press section with a high density, making it difficult for the body fluid to reach the outer side than the press section.

According to an ideal aspect, in the press section, the surface sheet, the back sheet, and the adhesive portion may be compressed in a thickness direction.

According to this aspect, the back sheet, the top sheet, and the adhesive portion are compressed together, so that the back sheet and the adhesive portion enter the recessed portion of the pressing portion together. Therefore, even if moisture reaches the adhesive portion, the adhesion is reduced, and the adhesive portion and the back surface The sheet is not easy to peel off.

According to an ideal aspect, the elongation strength of the back sheet is lower than that of the front sheet.

According to this aspect, when the press section is formed, the back sheet is not easily stretched and the back sheet is not easily thinned. Therefore, it is difficult for moisture to permeate through the press section, and it is possible to suppress a decrease in the strength of the adhesive portion due to the arrival of moisture. Moreover, since the elongation strength of the back sheet is low, the height of the unevenness of the press portion on the back sheet side is lower than the height of the unevenness of the press portion on the front sheet side. Therefore, the gap between the intimate clothing and the back sheet can be reduced, and the absorbent article can be stably fixed to the intimate clothing.

According to an ideal aspect, the ratio of the elongation strength in the width direction of the back sheet to the elongation strength in the length direction of the back sheet may be 0.7 or more and 1.3 or less.

According to this aspect, there is little difference in the elongation strength in the longitudinal direction of the back sheet and the elongation strength in the width direction. When the press section is formed, the back sheet is not easy to dent in the thickness direction. Therefore, the gap between the intimate clothing and the back sheet can be reduced, and the absorbent article can be stably fixed to the intimate clothing.

According to an ideal aspect, both the elongation strength in the longitudinal direction of the back sheet and the elongation strength in the width direction of the back sheet may be 2.0 N / 25 mm or more.

According to this aspect, the elongation strength in the longitudinal direction of the back sheet and the elongation strength in the width direction of the back sheet are stronger than the force applied to the back sheet when the absorbent article is peeled from the undergarment, which can prevent the back sheet from being accidentally broken.

According to an ideal aspect, the absorbent article may include a third region located at the center of the longitudinal direction, and a fourth region located closer to the outer side of the longitudinal direction than the third region. The maximum width in the width direction of the region is longer than the maximum width in the width direction of the third region. The press section in the fourth region has a length in the width direction that is longer than the press section in the third region. The wide width portion is provided at the position of the maximum width of the fourth region.

The outer edge of the absorbent article having the maximum width of the fourth region is easily applied by an external force such as the force of a foot. Since the wide width portion is provided at the position of the maximum width, the rigidity of the position of the maximum width can be increased by the wide width portion of the press portion, and the loss of the absorbent article from being distorted by the external force or the deviation from the intimate clothing can be suppressed.

According to an ideal aspect, the above-mentioned adhesive portion may be a plurality of, which extends along the width direction and is disposed at intervals in the length direction, and the adhesive portion located at the outermost side in the length direction is located in the foregoing The width direction overlaps the wide width portion.

The adhesive part located at the outermost side in the length direction is easy to receive the force along the length from the body and the undergarment. Since the adhesive portion overlaps the wide portion in the width direction, the wide portion of the press portion can increase the rigidity of the outermost adhesive portion, and can suppress the distortion of the absorbent article or the deviation from the underwear caused by external forces. Missing.

According to an ideal aspect, the adhesive portion located at the outermost side in the length direction may reach the outer edge of the absorbent article and overlap the wide portion in the thickness direction.

According to this aspect, the wide portion of the press portion can further increase the rigidity of the outermost adhesive portion, which can suppress the loss of the absorbent article from being distorted or shifted from the undergarment due to external forces.

According to an ideal aspect, a bonding portion may be provided in the outer region on the opposite side of the skin of the back sheet, and an adhesive is applied to the surface sheet and the back sheet.

According to this aspect, the superabsorbent polymer is adhered to the back sheet through the adhesive part on the back sheet side. The body fluid can be held until the body fluid reaches the adhesion portion provided on the back sheet, and it is easier to maintain the adhesion of the adhesion portion. In addition, since the superabsorbent polymer and the surface sheet are not adhered, a space for the expansion of the superabsorbent polymer is easily formed on the surface sheet side, and the superabsorbent polymer becomes easily swelled.

According to an ideal aspect, the non-skin facing surface of the surface sheet may be provided with an adhesive portion on the outer region, and an adhesive agent for coating the surface sheet and the back sheet may be applied. .

According to this aspect, a superabsorbent polymer is adhered to the surface sheet by the adhesive part on the surface sheet side. Therefore, it is possible to immediately absorb the body fluid transmitted through the surface sheet on the surface sheet side. In addition, since the superabsorbent polymer and the back sheet are not adhered, a space for the superabsorbent polymer to expand is easily formed on the back sheet side, and the superabsorbent polymer is liable to swell.

(2) Overall schematic structure of absorbent article Hereinafter, an absorbent article according to an embodiment will be described with reference to the drawings. In the following drawings, the same or similar parts are assigned the same or similar symbols. However, the drawing is for schematic display, please note that the ratio of each size will be different from the real thing. Therefore, specific dimensions and the like should be judged with reference to the following description. In addition, the respective drawings may include portions having different dimensional relationships, ratios, and the like.

The absorbent article is a pad. In addition, the absorbent article of the present invention may be an absorbent article that is used by being worn on intimate clothing, and may be, for example, a light incontinence pad. FIG. 1 is a plan view of the absorbent article 1 according to this embodiment as viewed from the skin-facing side. FIG. 2 is a plan view of the absorbent article shown in FIG. 1 as viewed from the non-skin-facing side. Fig. 3 is a schematic sectional view taken along the line A-A of the absorbent article shown in Fig. 1. Fig. 4 is a schematic sectional view taken along the line B-B of the absorbent article shown in Fig. 1.

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

The absorbent article 1 includes at least a front sheet 10, a back sheet 20, and an absorber 30. The surface sheet 10 is formed of a liquid-permeable sheet such as a non-woven fabric or a perforated plastic film. The surface sheet 10 may be formed by laminating a plurality of sheets, or may include a second sheet. For example, the surface sheet 10 may be constituted by a cotton sheet containing a cotton fiber and a skin-side sheet composed of a laminate of a sheet of yam and polyethylene, and the skin-side sheet and the second hot-air nonwoven fabric Sheet to form the surface sheet 10. The surface sheet 10 of this embodiment is made of a hot air nonwoven fabric. More preferably, the surface of the absorber side of the surface sheet 10 is comprised with a hot-air nonwoven fabric. Hot air nonwoven fabric-based fibers have a large space between them, and it is easy to uniformly dispose a super absorbent polymer of an absorber described later. Therefore, the superabsorbent polymer easily expands throughout the entire absorbent article, and the absorption performance can be improved.

The back sheet 20 is formed of an air-permeable and liquid-impermeable sheet such as a plastic film. In addition, since the back sheet 20 is breathable, it is easy to discharge moisture out of the absorbent article through the back sheet 20 when urine, sweat, and the like are absorbed. Therefore, the stuffiness can be reduced and the feeling of wearing can be improved. The top sheet 10 and the back sheet 20 reach the outer edge of the absorbent article. In this embodiment, the outer edge is the outer end in the width direction W, the front edge is the front edge, and the rear edge is the rear edge. In addition, the outer edge includes the outer periphery, the leading edge, and the trailing edge.

The non-skin facing surface of the back sheet 20 is provided with an adhesive portion 50 for attaching the absorbent article 1 to the undergarment. The adhesive portion 50 extends in the width direction W, and a plurality of the adhesive portions 50 are provided in the longitudinal direction L at intervals. The adhesive portion 50 may also reach the outer edge 1E of the absorbent article 1. The adhesive portion 50 includes an adhesive portion 51 located at the outermost side in the longitudinal direction L. The adhesive portion 51 located at the outermost side in the longitudinal direction L may be located closer to the outer side of the longitudinal direction L than the maximum width PM of the absorbent article 1. The maximum width PM of this absorbent article is the maximum width of the fourth region described later. Furthermore, in the modification, the adhesive portion 50 extends in the longitudinal direction L, and a plurality of the adhesive portions 50 are provided in the width direction W at intervals.

The absorber 30 is disposed between the front sheet 10 and the back sheet 20. The absorbent body 30 includes at least absorbent materials such as pulp 31 and superabsorbent polymer (SAP) 32. The absorption system has a pulp, through which the secretions can be absorbed. In addition, the absorption system has a superabsorbent polymer 32, and the superabsorbent polymer 32 can absorb urine, sweat, and the like. The absorbent body 30 may be a sheet-shaped absorbent body. The absorbent body 30 may have a core-wrapping layer for covering the absorbent material. As shown in FIG. 3, the absorber 30 includes a central region RC including a center in the thickness direction of the absorber, and a surface-side region RS located closer to the outer side in the thickness direction T than the central region RC. The surface-side region RS is provided on the skin-facing surface side T1 and the non-skin-facing surface side T2 in the central region RC, respectively. The boundary between the surface-side region RS and the central region RC is a boundary that divides the absorber 30 in three directions in the thickness direction.

The outer edge 30E of the absorbent body 30 is located further inside than the outer edge 1E of the absorbent article 1. That is, the front end edge 30F of the absorbent body 30 is located more rearward than the front end edge 1F of the absorbent article 1, and the rear end 縁 30R of the absorbent body 30 is located more forward than the rear end edge 1R of the absorbent article 1. The outer edge 30S of 30 is located closer to the inner side in the width direction W than the outer edge 1S of the absorbent article 1. An outer region RO is provided between the outer edge 30E of the absorbent body 30 and the outer edge 1E of the absorbent article 1. The outer region RO is a region provided with a diagonal line in FIG. 1. In the outer region RO, a front sheet 10 and a back sheet 20 are arranged. In the outer region RO, the pulp 31 is not arranged, but the superabsorbent polymer 32 is arranged. The superabsorbent polymer 32 is arranged in a region where an absorber is arranged and an outer region. Therefore, even when urine is discharged through the absorbent body, urine or the like can be held by the superabsorbent polymer 32. In addition, the superabsorbent polymer 32 can adsorb ammonia components, gaseous ammonia, and the like incorporated in water, and can also reduce the taste.

The absorbent article of this embodiment is used as a pad, and is used for a long period of time. The pulp can absorb body fluids such as secretions, sweat, and the like, and the superabsorbent polymer 32 can also absorb body fluids with slight incontinence. The absorbent article of this embodiment not only secretes, but even absorbs urine, the breathable back sheet 20 can release moisture to the outside and can maintain a clean and comfortable wearing feeling.

Fig. 4 is a view schematically showing a cross section of an absorbent article in the outer region RO. In the outer region RO, an overlapping portion P1 in which the superabsorbent polymer 32 and the adhesive portion 50 overlap in the thickness direction T is provided. In the overlapping portion P1, the top sheet 10, the superabsorbent polymer 32, the back sheet 20, and the adhesive portion 50 are arranged from the skin-facing surface side T1 toward the non-skin-facing surface side T2. When the body fluid reaches the overlapping portion P1, the body fluid is held by the superabsorbent polymer 32, and the body fluid does not easily reach the back sheet 20. Therefore, in the adhesive portion 50 of the overlapping portion P1, moisture from the back sheet 20 side is hard to reach, and the adhesive force can be maintained. In the overlapping portion P1, the adhesive force of the adhesive portion 50 can be maintained, and the absorbent article 1 can be prevented from inadvertently shifting to the undergarment. The body can be continuously worn in an appropriate position, and body fluid leakage can be suppressed. Therefore, it can reduce the stuffiness and improve the wearing feeling, and can continue to wear the body in an appropriate position, thereby suppressing the leakage of body fluids.

In the outer region RO, a non-arranged portion P2 in which the superabsorbent polymer 32 and the adhesive portion 50 are not disposed is provided. In the non-placement portion P2, the top sheet 10 and the back sheet 20 are arranged from the skin-facing surface side T1 toward the non-skin-facing surface side T2. Since the non-placement portion P2 is not provided with the superabsorbent polymer 32 and the adhesive portion 50, it has higher air permeability than the portion where the superabsorbent polymer 32 is disposed and the portion where the adhesive portion 50 is disposed. The non-placement portion P2 can ensure air permeability. Therefore, it can further reduce the stuffiness and improve the wearing feeling.

In the outer region RO, a polymer placement portion P3 in which the superabsorbent polymer 32 is arranged and the adhesive portion 50 is not arranged is provided. In the polymer placement portion P3, the top sheet 10 and the back sheet 20 are arranged from the skin-facing surface side T1 toward the non-skin-facing surface side T2. Since the polymer placement portion P3 is not provided with the adhesive portion 50, it is a portion that is relatively easy to move without being joined to the undergarment. Therefore, the superabsorbent polymer 32 is easily deformed (expanded). The superabsorbent polymer 32 disposed in the polymer disposition portion is easier to swell than the superabsorbent polymer 32 disposed in the overlap portion, and it is possible to ensure the absorption performance of body fluids.

In the outer region RO, there is provided an adhesive placement portion P4 in which the adhesive portion 50 is disposed and no superabsorbent polymer 32 is disposed. In the adhesive placement portion P4, the top sheet 10, the back sheet 20, and the adhesive portion 50 are arranged from the skin-facing surface side T1 toward the non-skin-facing surface side T2. The polymer placement portion P3 may be adjacent to at least one of the adhesive placement portion P4 and the non-placement portion P2 in a plan view. The superabsorbent polymer 32 of the polymer placement portion P3 can absorb not only body fluids reaching the polymer placement portion P3 but also surrounding moisture. Therefore, it is possible to reduce moisture in the adhesive placement portion P4, the non-placement portion P2, and the like adjacent to the polymer placement portion P3. According to such a structure, in the adhesive arrangement part P4, it is possible to allow air to pass through without allowing moisture to pass, and it is possible to maintain the adhesive force of the adhesive part 50.

In the outer region RO, a press section 60 may be provided that compresses the front sheet 10 and the back sheet 20 in the thickness direction T. The press section 60 is provided along the outer edge 1E of the absorbent article 1. A plurality of press sections 60 are provided on the inner side of the outer edge 1E of the absorbent article 1 and are arranged along the outer edge 1E with a gap therebetween. By providing the pressing section 60, even if the body fluid reaches the pressing section 60 in the outer region RO, the body fluid will diffuse in the high-density pressing section 60, and therefore, the body fluid does not easily reach the outside of the pressing section 60. In addition, the non-arranged portion and the adhesively disposed portion in the outer region RO may not be provided with the superabsorbent polymer 32, and when the pressing portion 60 is formed, the back sheet and the like are not easily damaged. Therefore, it is possible to ensure adhesion to intimate clothes or to suppress leakage of body fluids caused by breakage of the sheet.

In the press section 60, the front sheet 10, the back sheet 20, and the adhesive portion 50 may also be compressed in the thickness direction. The back sheet 20, the top sheet 10, and the adhesive portion 50 are compressed together, so that the back sheet 20 and the adhesive portion 50 enter the formed recess together. Therefore, even if moisture reaches the adhesive portion 50, the adhesiveness is reduced, and the adhesive portion 50 and The back sheet 20 is also not easily peeled.

The elongation strength of the back sheet 20 is higher than that of the front sheet 10. It is more preferable that the elongation strength of the back sheet 20 is higher than the elongation strength of other materials (surface sheet, absorber, etc.) constituting the absorbent article. Here, the elongation strength refers to a value in which the difficulty of elongation of the sheet in the planar direction is an index, and specifically, it can be measured by the following measurement method. (1) A pull test machine and (2) a punching die (rectangular die length 44 mm x width 25 mm) were used. The procedure is to first prepare a test piece. The test piece was made by immersing an absorbent article in toluene, dividing it into a front sheet and a back sheet, and then punching the sheet to be measured at a size of 45 mm × 25 mm with a punching die. In order to obtain a gripping interval of 30 mm in the center of the test piece, grip portions are provided at the lengths of both ends of the test piece in the longitudinal direction (45 mm) to 7 mm. The gripping portion was made of an aluminum strip having a length of 50 mm and a width of 30 mm, and holding the test piece from both sides. Next, the measurement was performed at a holding interval: 30 mm and a pulling speed: 500 mm / min. The strength (N / 25mm) and the maximum elongation strength (N / 25mm) at the 5% elongation in the length and width directions were measured.

The relationship between the elongation strength of the surface sheet and the back sheet of the present invention is defined as follows. The 5% elongation strength of the surface sheet in the longitudinal direction is higher than the 5% elongation strength of the back sheet, and the 5% elongation strength in the width direction of the surface sheet is greater than the 5% elongation strength in the width direction of the back sheet. If it is higher, the elongation strength of the front sheet 10 is higher than that of the back sheet. In addition, the 5% elongation strength of the surface sheet in the longitudinal direction is higher than the 5% elongation strength of the back sheet, and the 5% elongation strength in the width direction of the surface sheet is greater than the 5% elongation in the width direction of the back sheet. When the strength is low, the elongation strength of the surface sheet in the longitudinal direction is lower than that of the back sheet by 5%, and the elongation strength of the surface sheet in the width direction is lower than that in the width direction of the back sheet. When the% elongation strength is low, and the 5% elongation strength in the longitudinal direction of the surface sheet is lower than the 5% elongation strength in the longitudinal direction of the back sheet, and the 5% elongation strength in the width direction of the surface sheet is lower than that of the back sheet. When the elongation strength of 5% in the width direction is high, the elongation strength of the back sheet 20 is higher than that of the front sheet 10.

The elongation strength of the back sheet 20 is higher than the elongation strength of the top sheet 10. Therefore, when the press section 60 is formed, the back sheet 20 is not easily extended and the back sheet 20 is not easily thinned. Therefore, it is difficult for moisture to penetrate through the press section 60, and it is possible to suppress a decrease in the strength of the adhesive section 50 due to the arrival of moisture. In addition, since the back sheet 20 has high elongation strength and the back sheet 20 is not easily stretched, the height of the unevenness of the press section on the back sheet 20 side is lower than the height of the unevenness of the press section on the front sheet 10 side. Therefore, the gap between the intimate clothing and the back sheet can be reduced, and the absorbent article can be stably fixed to the intimate clothing. In addition, the front sheet in this embodiment extends only in one of the longitudinal direction and the width direction, and the back sheet extends in both the longitudinal direction and the width direction. Since it can be extended in both directions, the elongation strength is easily reduced.

The ratio of the elongation strength in the width direction of the back sheet to the elongation strength in the length direction of the back sheet is 0.7 or more and 1.3 or less. More preferably, the ratio is 0.9 or more and 1.1 or less. Since the ratio of the elongation strength in the width direction of the back sheet to the elongation strength in the length direction of the back sheet is 0.7 or more and 1.3 or less, there is little difference between the elongation strength in the longitudinal direction of the back sheet and the elongation strength in the width direction. In the press section, the back sheet is not easily sunken in the thickness direction. Therefore, the gap between the intimate clothing and the back sheet can be reduced, and the absorbent article can be stably fixed to the intimate clothing.

The elongation strength in the longitudinal direction of the back sheet and the elongation strength in the width direction of the back sheet are both 2.0 N / 25 mm or more, and more preferably 5.0 N / 25 mm or more. Since the back sheet has an elongation strength of 2.0 N / 25 mm or more, the force applied to the back sheet when peeling the absorbent article from the undergarment is stronger, and the back sheet can be prevented from being accidentally broken.

As shown in FIG. 3, the outer region RO includes a first region R1 on the absorber 30 side, and a second region R2 on the outer edge 1E side of the absorbent article 1. The boundary between the first region R1 and the second region R2 is the center of the outer edge 1E of the absorbent article 1 and the outer edge 30E of the absorbent body 30. The density of the superabsorbent polymer 32 in the first region R1 is higher than the density of the superabsorbent polymer 32 in the second region R2. The first region R1 based high-absorbent polymer 32 has a high density and can hold body fluids that the absorbent body 30 cannot completely hold. The second region R2 abuts on a region that is easily sweated when separated from the excretory portion. The second region R2 can surely absorb sweat with less water discharge than excrement. In addition, since the density of the superabsorbent polymer in the second region R2 is low, it is possible to reduce the discomfort caused to the skin by the unevenness when the superabsorbent polymer 32 swells. In addition, as a method for measuring the density, a test piece having the same area in each of the first area and the second area is cut, and the superabsorbent polymer contained in the test piece is taken out and the weight is measured to thereby measure the density.

The density of the superabsorbent polymer 32 in the outer outer region RO that is closer to the width direction W than the absorber 30 is higher than the second region in the outer outer region RO that is closer to the length direction L than the absorber 30. The high-absorbent polymer 32 has a higher density. The RO system, which is located on the outer outer side region closer to the width direction W than the absorber 30, is easily contacted by the base of the wearer's foot. In a region abutting the base of a foot that is prone to sweating, it is possible to absorb moisture due to sweat and the like. In addition, as a method for measuring the density, a test piece of the same area was cut in each area in the same manner as in the first area and the second area, and a superabsorbent polymer contained in the test piece was taken out to measure the weight. This makes it possible to measure the density.

In the absorber, the density of the superabsorbent polymer 32 may be constant or different. As shown in FIG. 3, the density of the superabsorbent polymer 32 in the central region RC of the absorber 30 is higher than the density of the superabsorbent polymer 32 in the surface side region RS of the absorber 30. Due to the high 32 density of the superabsorbent polymer in the central region, the central region RC easily expands when absorbing body fluids. Therefore, the absorption capacity of a body fluid can be ensured. In addition, the density of the superabsorbent polymer 32 in the surface-side region RS is low, and when the body fluid is absorbed, the surface-side region RS is less likely to swell. In the surface region RS, unevenness due to the expansion of the superabsorbent polymer 32 is difficult to be formed, so that the unevenness of the absorbent body is not easily transmitted to the top sheet 10, the back sheet 20, and the like, which are located outside the thickness direction of the absorbent body. . It is possible to reduce discomfort when wearing the surface sheet 10, the back sheet 20, and the like due to the unevenness. Furthermore, as a method for measuring the density, the absorbent article was cut with a cross-section along the thickness direction, and the cross-section was imaged with an electronic photograph to measure the superabsorbent polymer contained in the same area in each region. The number of objects is measured as the higher the number, the higher the density.

The hydrophilicity of the skin-facing surface side T1 of the absorber 30 may be higher than that of the non-skin-facing surface side T2 of the absorber 30. Here, the degree of hydrophilicity refers to the strength with which the absorber attracts water. The side with higher hydrophilicity has a stronger ability to absorb liquid than the side with lower hydrophilicity. Since the skin-facing surface side T1 of the absorber 30 has high hydrophilicity, the body fluid discharged to the surface sheet 10 can be quickly absorbed, and the body fluid can be retained by the superabsorbent polymer 32 in the absorber 30. In addition, since the non-skin-facing surface side T2 of the absorbent body 30 has low hydrophilicity, the body fluid in the absorbent body 30 does not easily reach the back sheet 20. Therefore, it is difficult for the water in the body fluid to reach the adhesive portion 50, the decrease in the adhesive force due to the arrival of water can be suppressed, and the displacement of the absorbent article can be suppressed.

As a method of making the absorbent body hydrophilic in different thickness directions, for example, the absorbent body is constituted by two layers of an upper layer on the skin-facing surface side and a lower layer on the non-skin-facing surface side. The adhesives that hold the absorbent material differ in hydrophilicity. As the binder of the upper layer, one containing a hydrophilic agent can be used, and as the binder of the lower layer, one without a hydrophilic agent can be used.

The hydrophilicity can be measured by the following method. (1) Five filter papers are stacked horizontally, and a test piece of a measurement target is placed on the filter paper. (2) Mark the test piece at 2 cm intervals in the vertical and horizontal directions, respectively. With a dropper, one drop of artificial urine (about 0.05 g) was dropped to 20 sites. The drip of artificial urine was performed in 20 places in 1 minute and 10 seconds. (3) After standing for 30 seconds from the completion of dripping at 20 sites, the site absorbed by the test piece was calculated. The more absorption sites of the test piece, the higher the hydrophilicity.

In the outer region RO, an adhesive portion 70 is provided on the skin-opposing surface of the back sheet 20, and an adhesive is applied to the top sheet 10 and the back sheet 20. Examples of the adhesive include a hot-melt adhesive. The superabsorbent polymer 32 is adhered to the back sheet 20 through the adhesive part on the back sheet side. The body fluid can be held until the body fluid reaches the adhesion portion 50 provided on the back sheet 20, and it is easier to maintain the adhesion of the adhesion portion 50. In addition, since the superabsorbent polymer 32 and the surface sheet 10 are not adhered, a space for the expansion of the superabsorbent polymer 32 is easily formed on the surface sheet 10 side, and the superabsorbent polymer 32 easily expands.

As shown in FIG. 1, the absorbent article 1 includes a third region R3 located at the center of the longitudinal direction L, and a fourth region R4 located closer to the outside of the longitudinal direction L than the third region. The boundary between the third region R3 and the fourth region R4 is a boundary that divides the absorbent article into three equal parts in the length direction L. The maximum width in the width direction W of the fourth region is longer than the maximum width in the width direction W of the third region.

The press section 60 may be provided across the third region R3 and the fourth region R4. The press section 60 in the fourth region R4 has a wide width 61 having a length in the width direction W that is longer than the press section 60 in the third region R3. The wide-width portion 61 is a region given a diagonal line in FIG. 2. The press section 60 in the third region R3 and the press section 60 in the fourth region R4, which is located closer to the inner side in the longitudinal direction L than the wide section 61, are linear press sections 65 connected by a plurality of arcs, and The linear press section 65 is formed by a dot press section 66 which is further inside and is arranged along the linear press section 60. That is, two rows of press sections are arranged. On the other hand, in the wide width portion 61, dot-shaped press portions 66 arranged along the linear press portions 65 are provided on the outer side and the inner side of the linear press portions 65 connected to a plurality of arcs, respectively. That is, three rows of press sections are arranged. The wide width portion 61 may be provided at the position of the maximum width PM in the fourth region. The outer edge of the absorbent article having the maximum width of the fourth region is easily applied by an external force such as the force of a foot. Since the wide-width portion 61 is provided at the position of the maximum width, the rigidity of the position of the maximum width can be increased by the wide-width portion 61 of the pressing portion 60, and it is possible to suppress the absorbent article from being distorted or shifted from the undergarment by external force Missing.

Further, the wide-width portion 61 may overlap the widthwise direction W with the adhesive portion 51 located at the outermost side in the longitudinal direction L. The state of overlapping in the width direction W refers to a state in which the adhesive portion 51 is arranged on an extension line extending in the width direction W of the wide width portion 61. The adhesive portion 51 located at the outermost side in the longitudinal direction is apt to receive the force along the longitudinal direction L from the body, the undergarment, and the like. Since the adhesive portion 51 overlaps the wide portion 61 in the width direction W, the wide portion 61 of the press portion 60 can increase the rigidity of the outermost adhesive portion 51 and can suppress the distortion of the absorbent article due to external forces. Or the absence of offset from undergarments.

More preferably, the adhesive portion 51 located at the outermost side in the longitudinal direction L reaches the outer edge 1E of the absorbent article and overlaps the wide-width portion 61 in the thickness direction T. The wide width portion 61 of the pressing portion 60 can further increase the rigidity of the outermost adhesive portion 50, and can suppress the loss of the absorbent article from being distorted or shifted from the undergarment due to an external force.

As mentioned above, although this invention was demonstrated in detail using the said embodiment, this invention is not limited to a person skilled in the art by the embodiment described in this specification. The present invention can be implemented with various modifications and changes without departing from the technical idea and scope of the present invention as defined by the description in the scope of the patent application. Therefore, the description purpose of this specification is for illustration, and is not intended to limit the present invention.

For example, the absorbent article according to the modification is provided in the outer region RO, and has a bonding portion on the non-skin facing surface of the top sheet 10, and is coated with a bonding agent for bonding the top sheet 10 and the back sheet 20. The superabsorbent polymer 32 is adhered to the surface sheet 10 by the adhesive part on the surface sheet 10 side. Therefore, the body fluid transmitted from the surface sheet 10 can be immediately absorbed on the surface sheet 10 side. In addition, since the superabsorbent polymer 32 and the back sheet 20 are not adhered, a space for the expansion of the superabsorbent polymer 32 is easily formed on the backsheet 20 side, and the superabsorbent polymer 32 easily expands. When the non-skin facing surface of the surface sheet 10 is made of a hot-air nonwoven fabric, the superabsorbent polymer 32 easily enters the nonwoven fabric having a high degree of bulkiness and a large space between fibers. Therefore, it is easier to form a space for expansion on the back sheet 20 side of the superabsorbent polymer 32, and the absorption performance can be improved.

Furthermore, all the contents of Japanese Patent Application No. 2018-052339 filed on March 20, 2018 are referred to in this specification.

[Industrial availability]

According to the present invention, it is possible to provide an absorbent article which can reduce the stuffiness and improve the wearing feeling, and can continuously wear the body in an appropriate position, thereby suppressing the leakage of body fluids.

1‧‧‧ absorbent article

10‧‧‧ surface sheet

20‧‧‧ back sheet

30‧‧‧ Absorber

31‧‧‧ Pulp

32‧‧‧ Super Absorbent Polymer

50‧‧‧ Adhesive

51‧‧‧The outermost adhesive part in the length direction

60‧‧‧pressing department

61‧‧‧wide

70‧‧‧ Follow-up

RO‧‧‧Outside area

R1‧‧‧Area 1

R2‧‧‧ Zone 2

R3‧‧‧Region 3

R4‧‧‧Area 4

RC‧‧‧Central area

RS‧‧‧ surface side area

P1‧‧‧ Overlap

P2‧‧‧ non-configuration department

P3‧‧‧Polymer Disposition Department

P4‧‧‧Adhesive placement department

PM‧‧‧Maximum width

T‧‧‧thickness direction

T1‧‧‧Side-facing side

T2‧‧‧ Non-skin facing side

FIG. 1 is a plan view of the absorbent article according to the embodiment as viewed from the skin-facing side.

FIG. 2 is a plan view of the absorbent article shown in FIG. 1 as viewed from the non-skin-facing side.

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

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

Claims (17)

An absorbent article having a length direction and a width direction orthogonal to each other; Liquid permeable surface sheet; Air-permeable and liquid-impermeable back sheet; Disposed between the front sheet and the back sheet, and having at least an absorber of pulp and a superabsorbent polymer; and The non-skin-facing adhesive portion provided on the back sheet is characterized in that: The outer edge of the absorbent body is located more inside than the outer edge of the absorbent article, In an outer region between the outer edge of the absorbent body and the outer edge of the absorbent article, an overlapping portion in which the super absorbent polymer and the adhesive portion overlap in the thickness direction is provided. For example, in the absorbent article according to the first patent application range, in the outer region, a non-arranged portion where the aforementioned super absorbent polymer and the aforementioned adhesive portion are not arranged is provided. For example, in the absorbent article according to item 1 or 2 of the scope of patent application, in the outer region, a polymer disposition portion configured with the aforementioned superabsorbent polymer and not provided with the aforementioned adhesive portion is provided. For example, in the absorbent article according to the scope of application for patent No. 3, in the outer region, an adhesive disposition portion is provided in which the adhesive portion is disposed and the superabsorbent polymer is not disposed. The adhesive placement portion and the polymer placement portion are adjacent to each other in a plan view. For example, if the absorbent article according to item 1 or 2 of the patent application scope, the outer region has a first region on the absorber side and a second region on the outer edge side of the absorbent article, The density of the superabsorbent polymer in the first region is higher than the density of the superabsorbent polymer in the second region. For example, in the absorbent article according to claim 1 or 2, the absorbent system has a central region including a center in the thickness direction of the absorbent body, and a surface side located closer to the outer side in the thickness direction than the central region. region, The density of the super absorbent polymer in the central region is higher than the density of the super absorbent polymer in the surface side region. For example, in the absorbent article according to item 1 or 2, the hydrophilicity of the skin-facing side of the absorbent body is higher than that of the non-skin-facing side of the absorbent body. For example, if the absorbent article according to item 1 or 2 of the patent application scope includes a pressing section for compressing at least the front sheet and the back sheet in the thickness direction in the outer region, The press section is arranged along an outer edge of the absorbent article. For example, in the absorbent article according to item 8 of the patent application scope, in the press section, the surface sheet, the back sheet, and the adhesive portion are compressed in the thickness direction. For example, the absorbent article according to item 9 of the patent application, wherein the elongation strength of the back sheet is higher than that of the front sheet. For example, in the absorbent article of claim 10, the ratio of the elongation strength in the width direction of the back sheet to the elongation strength in the length direction of the back sheet is 0.7 or more and 1.3 or less. For example, if the absorbent article according to item 10 or 11 of the patent application scope, the elongation strength of the back sheet in the longitudinal direction and the elongation strength of the back sheet in the width direction are both 2.0N / 25mm or more. For example, if the absorbent article in the 9th or 10th of the scope of application for a patent is applied, the absorbent article has: a third region located at the center of the longitudinal direction; and a third region located closer to the outside of the longitudinal direction than the third region. 4 areas, The maximum width in the width direction of the fourth region is longer than the maximum width in the width direction of the third region. The press section in the fourth region has a wide width having a length in the width direction that is longer than the press section in the third region, The wide width portion is provided at the position of the maximum width of the fourth region. For example, the absorbent article according to item 13 of the patent application, wherein the above-mentioned adhesive portion is a plurality of, and extends along the width direction and is disposed in the length direction at intervals, The adhesive portion located on the outermost side in the length direction overlaps the wide width portion in the width direction. For example, in the absorbent article of the scope of application for patent No. 14, wherein the adhesive portion located at the outermost side in the length direction reaches the outer edge of the absorbent article and overlaps the wide width portion in the thickness direction. For example, the absorbent article according to item 1 or 2 of the patent application scope, wherein, on the outer region, an adhesive portion is provided on the skin-facing side of the back sheet, and is coated with the front sheet and the back sheet. Then the adhesive. For example, in the absorbent article according to item 1 or 2 of the patent application scope, in the outer region, a non-skin facing surface of the surface sheet is provided with an adhesive portion, which is coated with the surface sheet and the back surface. The sheet is followed by an adhesive.