TWI798389B - absorbent article - Google Patents

Abstract

The present invention provides an absorbent article that can reduce stuffiness and improve wearing comfort, and can be continuously worn on the body at an appropriate position, thereby suppressing leakage of bodily fluids. An absorbent article (1) has: a length direction (L) and a width direction (W) perpendicular to each other; a liquid-permeable top sheet (10); an air-permeable and liquid-impermeable back sheet (20); at least pulp (31) Absorbent body (30) with superabsorbent polymer (32); and adhesive part (50) disposed on the non-skin-facing surface of the back sheet. The outer edge of the absorbent body is located further inside than the outer edge of the absorbent article. In the outer region (RO) between the outer edge of the absorber and the outer edge of the absorbent article, an overlapping portion (P1) in which the superabsorbent polymer and the adhesive portion overlap in the thickness direction is provided.

Description

absorbent article

The present invention relates to absorbent articles worn on underwear such as pads and light incontinence pads.

Conventionally, absorbent articles worn on underwear to absorb body fluids such as secretions, sweat, and urine have been used. The absorbent article of Patent Document 1 has: a top sheet; a back sheet; an absorber having at least pulp and a superabsorbent polymer disposed between the top sheet and the back sheet; and a non-skin facing surface of the back sheet The adhesive part. The back sheet of Patent Document 1 is composed of an air-impermeable or air-permeable film (paragraph 0019 of the specification of Patent Document 1). [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2015-154881

Patent Document 1 describes that stuffiness can be reduced by constituting the back sheet with an air-permeable film. However, since an adhesive portion is provided on the non-skin-facing surface of the back sheet, moisture will reach the adhesive portion via the air-permeable back sheet. If moisture reaches the adhesive part, the adhesive force of the adhesive part may be weakened. Therefore, the absorbent article may inadvertently deviate from the close-fitting clothing, and cannot be continuously worn in a proper position on the body, resulting in body fluid leakage.

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

An absorbent article comprising: a length direction and a width direction perpendicular to each other; a liquid-permeable top sheet; an air-permeable and liquid-impermeable back sheet; disposed between the front sheet and the back sheet , having at least an absorber of pulp and a superabsorbent polymer; and an absorbent article disposed on an adhesive portion of the non-skin-facing surface of the aforementioned back sheet, wherein the outer edge of the aforementioned absorbent article is located at a lower position than the aforementioned absorbent On the inner side of the outer edge of the absorbent article, in the outer region between the outer edge of the absorbent body and the outer edge of the absorbent article, there is an overlapping arrangement of the adhesive part and the superabsorbent polymer in the thickness direction. department.

(1) Outline of Embodiment Based on the description in this manual and drawings, at least the following matters can be clarified. An absorbent article comprising: a length direction and a width direction perpendicular to each other; a liquid-permeable top sheet; an air-permeable and liquid-impermeable back sheet; disposed between the front sheet and the back sheet , having at least an absorber of pulp and a superabsorbent polymer; and an absorbent article disposed on an adhesive portion of the non-skin-facing surface of the aforementioned back sheet, wherein the outer edge of the aforementioned absorbent article is located at a lower position than the aforementioned absorbent On the inner side of the outer edge of the absorbent article, in the outer region between the outer edge of the absorbent body and the outer edge of the absorbent article, there is an overlapping arrangement of the adhesive part and the superabsorbent polymer in the thickness direction. department.

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 in the case where urine is discharged beyond the absorber, urine and the like can be retained by the superabsorbent polymer in the outer region. Moreover, since the back sheet has air permeability, when urine, sweat, etc. are absorbed, moisture is easily discharged to the outside of the absorbent article through the back sheet. Therefore, stuffiness can be reduced and the wearing feeling can be improved. In the outer area, there is an overlapping portion where the superabsorbent polymer and the adhesive portion overlap in the thickness direction. When the bodily fluid reaches the overlapping portion, the superabsorbent polymer retains the bodily fluid, making it difficult for the bodily fluid to reach the back sheet. Therefore, moisture from the back sheet side does not easily reach the adhesive portion of the overlapping portion, and the adhesive force can be maintained. It can be continuously worn in place on the body and can inhibit the leakage of bodily fluids.

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

According to this aspect, since the non-arrangement part is not arranged with the superabsorbent polymer and the adhesive part, it has higher air permeability than the part with the superabsorbent polymer and the part with the adhesive part. Air permeability can be ensured by this non-arrangement part. Therefore, stuffiness can be further reduced and the wearing feeling can be improved.

In other aspects of the absorbent article, a polymer arrangement portion on which the above-mentioned superabsorbent polymer is arranged and on which the above-mentioned adhesive portion is not arranged may also be provided on the outer region.

According to this aspect, since the polymer placement part does not have an adhesive part and is easy to move with respect to the underwear, the superabsorbent polymer is easy to deform (swell). The superabsorbent polymer disposed on the polymer placement portion swells more easily than the superabsorbent polymer disposed on the overlapping portion, thereby ensuring the absorption performance of body fluids.

According to an ideal aspect, it is also possible to provide an adhesive disposition portion on the outer region where the adhesive portion is disposed and the superabsorbent polymer is not disposed, and the adhesive disposition portion and the polymer disposition portion are viewed from above next to each other.

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

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

According to this aspect, the density of the superabsorbent polymer in the first region is high, and it is possible to retain bodily fluids that cannot be completely retained by the absorber. The second area is in contact with the area prone to perspiration separated from the excretory part. With the second zone, it is possible to reliably absorb sweat that emits less water than excrement. Also, since the density of the superabsorbent polymer in the second region is low, it is possible to reduce discomfort to the skin due to unevenness when the superabsorbent polymer swells.

According to an ideal aspect, the absorbent system may have a central region including the center of the absorber in the thickness direction, and a surface-side region located on the outside of the central region in the thickness direction. The density of the aforementioned superabsorbent polymer is higher than the density of the aforementioned superabsorbent polymer in the surface side region.

According to an ideal aspect, the hydrophilicity of the skin-facing side of the absorber may be higher than the hydrophilicity of the non-skin-facing side of the absorber.

According to this aspect, since the skin-facing side of the absorber has a high degree of hydrophilicity, body fluid excreted into the surface sheet can be quickly absorbed, and the body fluid can be retained by the superabsorbent polymer in the absorber. Also, since the non-skin-facing side of the absorber has a low degree of hydrophilicity, bodily fluids in the absorber are less likely to reach the back sheet. Therefore, the moisture of the bodily fluid becomes difficult to reach the adhesive part, and the reduction of the adhesive force due to the arrival of the moisture can be suppressed, and the shifting of the absorbent article can be suppressed.

According to this aspect, the density of the superabsorbent polymer in the central region is high, and the central region tends to swell when absorbing body fluids. Therefore, the absorption capacity of bodily fluid can be ensured. In addition, the density of the superabsorbent polymer in the surface-side region is low, and the surface-side region is less likely to swell when bodily fluid is absorbed. Since unevenness due to expansion of the superabsorbent polymer is less likely to be formed in the surface side region, the unevenness of the absorber becomes less likely to be transmitted to the surface sheet, back sheet, etc. located outside the thickness direction of the absorber. It can reduce discomfort when wearing due to unevenness transmitted to the surface sheet, back sheet, etc.

According to an ideal aspect, a press section for compressing 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 squeeze part, the body fluid diffuses in the high-density squeeze part, making it difficult for the body fluid to reach the outside of the squeeze part.

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

According to this aspect, the back sheet, the surface sheet, and the adhesive part are compressed together, so that the back sheet and the adhesive part enter the concave part of the press part together. Therefore, even if moisture reaches the adhesive part, the adhesiveness decreases, and the adhesive part and the back The flakes are also not easy to peel off.

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

According to this aspect, when the press portion is formed, the back sheet is less likely to elongate, and the back sheet is less likely to become thin. Therefore, it is difficult for moisture to permeate through the press part, and it is possible to suppress the decrease in the strength of the adhesive part due to the arrival of moisture. Also, since the elongation strength of the back sheet is low, the height of the concavity and convexity of the press portion on the back sheet side is lower than that of the press portion on the front sheet side. Therefore, the gap between the underwear and the back sheet can be narrowed, and the absorbent article can be stably fixed to the underwear.

According to a preferred aspect, the ratio of the elongation strength in the width direction of the back sheet to the elongation strength in the longitudinal direction of the back sheet may be 0.7 or more and 1.3 or less.

According to this aspect, the difference between the elongation strength in the longitudinal direction and the elongation strength in the width direction of the back sheet is small, and when the press portion is formed, the back sheet is less likely to be dented in the thickness direction. Therefore, the gap between the underwear and the back sheet can be narrowed, and the absorbent article can be stably fixed to the underwear.

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 of the back sheet in the longitudinal direction and the elongation strength of the back sheet in the width direction are stronger than the force applied to the back sheet when the absorbent article is peeled off from the underwear, thereby preventing the back sheet from being accidentally damaged.

According to an ideal aspect, the absorbent article may have: a third region located in the center of the longitudinal direction; and a fourth region located on the outer side of the longitudinal direction than the third region, the fourth region The maximum width in the width direction of the zone is longer than the maximum width in the width direction of the third zone, and the press section in the fourth zone has a longer length in the width direction than the press section in the third zone The wide part of the width is set at the position of the aforementioned maximum width of the aforementioned fourth region.

The outer edge of the absorbent article having the largest width in the fourth region is easily applied by an external force such as the strength of the foot. Since the wide portion is provided at the position of the maximum width, the wide portion of the press portion can increase the rigidity of the position of the maximum width, thereby preventing the absorbent article from being twisted or missing from the underwear due to external force.

According to an ideal aspect, there may be a plurality of the above-mentioned adhesive parts, which extend along the aforementioned width direction and are arranged at intervals in the aforementioned longitudinal direction, and the aforementioned adhesive parts located on the outermost side in the aforementioned longitudinal direction are arranged on the aforementioned In the width direction, it overlaps with the aforementioned wide width portion.

The adhesive part located on the outermost side in the length direction is easy to receive force along the length direction from the body, underwear, etc. Since the adhesive portion overlaps with the wide-width portion in the width direction, the wide-width portion of the press portion can increase the rigidity of the outermost adhesive portion, and prevent the absorbent article from twisting or shifting from the underwear due to external force. lack of.

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

According to this aspect, the rigidity of the adhesive portion located on the outermost side can be further increased by the wide portion of the press portion, and it is possible to suppress the distortion of the absorbent article or the loss of deviation from the underwear due to external force.

According to an ideal aspect, in the outer region, on the skin-facing surface of the back sheet, there may be an adhesive portion coated with an adhesive for bonding the front sheet and the back sheet.

According to this aspect, the superabsorbent polymer is bonded to the back sheet through the bonding portion on the back sheet side. Bodily fluid can be retained until the body fluid reaches the adhesive portion provided on the back sheet, making it easier to maintain the adhesive force of the adhesive portion. In addition, since the superabsorbent polymer and the surface sheet are not bonded, a space for the superabsorbent polymer to expand is easily formed on the surface sheet side, and the superabsorbent polymer becomes easy to swell.

According to an ideal aspect, on the outer region, on the non-skin-facing surface of the surface sheet, there may be an adhesive portion coated with an adhesive for bonding the surface sheet to the back sheet. .

According to this aspect, the superabsorbent polymer is bonded to the surface sheet through the bonding portion on the surface sheet side. Therefore, body fluid penetrating through the surface sheet can be immediately absorbed on the surface sheet side. In addition, since the superabsorbent polymer and the back sheet are not bonded, a space for the superabsorbent polymer to expand is easily formed on the back sheet side, and the superabsorbent polymer easily swells.

(2) Overall outline structure of absorbent article Hereinafter, referring to the drawings, the absorbent article according to the embodiment will be described. In addition, in description in the following drawings, the same or similar code|symbol is attached|subjected to the same or similar part. However, the illustrations are schematic displays, so please note that the ratio of each dimension may differ from the actual product. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part which differs in the relationship of a mutual dimension, a ratio, etc. may be included between each drawing.

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

The absorbent article 1 has a longitudinal direction L and a width direction W which are perpendicular to each other. The length direction L is defined by a direction extending toward the front side of the body and the back side of the body. In other words, the longitudinal direction L is the direction extending forward and backward on the expanded 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 side T1 facing the wearer and the non-skin-facing side opposite to the skin-facing side T2.

The absorbent article 1 includes at least a top sheet 10 , a back sheet 20 , and an absorber 30 . The surface sheet 10 is composed of a liquid-permeable sheet such as non-woven fabric or perforated plastic film. The surface sheet 10 may be formed by laminating a plurality of sheets, or may have a second sheet. For example, the surface sheet 10 is formed by a skin-side sheet composed of a cotton sheet containing cotton fibers and a laminate of sheets formed of rayon and polyethylene, and the skin-side sheet and the second air-through non-woven fabric sheet to form the surface sheet 10. The surface sheet 10 of this embodiment is made of air-through non-woven fabric. More preferably, the absorber-side surface of the surface sheet 10 is constituted by an air-through nonwoven fabric. The air-through nonwoven fabric has relatively large spaces between fibers, and it is easy to evenly arrange the superabsorbent polymer of the absorber described later. Therefore, the superabsorbent polymer easily swells and spreads over the entire absorbent article, and the absorption performance can be improved.

The back sheet 20 is made of an air-permeable and liquid-impermeable sheet such as a plastic film. Moreover, since the back sheet 20 has air permeability, when urine, sweat, etc. are absorbed, moisture is easily discharged to the outside of the absorbent article through the back sheet 20 . Therefore, stuffiness can be reduced and the wearing feeling 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 edge in the width direction W, the front edge is the front edge, and the rear edge is the rear edge. Also, the outer edge is an edge including the entire outer periphery of the outer edge, the front edge, and the rear edge.

On the non-skin-facing surface of the back sheet 20, an adhesive portion 50 for attaching the absorbent article 1 to underwear is arranged. The adhesive part 50 extends in the width direction W, and is provided in plural at intervals in the length direction L. As shown in FIG. The adhesive part 50 can also reach the outer edge 1E of the absorbent article 1 . The adhesive portion 50 has an adhesive portion 51 located on the outermost side in the longitudinal direction L. As shown in FIG. The adhesive portion 51 located on the outermost side in the longitudinal direction L may also 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 4th area mentioned later. Furthermore, in a modified example, the adhesive portion 50 extends in the longitudinal direction L, and is provided in plural at intervals in the width direction W. As shown in FIG.

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

The outer edge 30E of the absorber 30 is located inside the outer edge 1E of the absorbent article 1 . That is, the front end edge 30F of the absorbent body 30 is located on the rear side of the front end edge 1F of the absorbent article 1, and the rear end edge 30R of the absorbent body 30 is located on the front side of the rear end edge 1R of the absorbent article 1. The outer edge 30S of 30 is located on 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 absorber 30 and the outer edge 1E of the absorbent article 1 . The outer region RO is a hatched region in FIG. 1 . In the outer region RO, the top sheet 10 and the 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 the region where the absorber is arranged and the outer region. Therefore, even when the urine is discharged beyond the absorber, the superabsorbent polymer 32 can hold the urine and the like. In addition, the superabsorbent polymer 32 can absorb ammonia, gaseous ammonia, etc. dissolved in water, and can also reduce odor.

The absorbent article of this embodiment is used as a panty liner for a long period of time. Body fluids such as secretions and sweat can be absorbed by the pulp, and body fluids such as slight incontinence can also be absorbed by the superabsorbent polymer 32 . The absorbent article of this embodiment can release moisture to the outside by the air-permeable back sheet 20 even if it absorbs not only secretions but also urine, and can maintain a clean and comfortable wearing feeling.

Fig. 4 is a diagram schematically showing a cross section of an absorbent article in an outer region RO. In the outer region RO, an overlapping portion P1 where 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 side T1 toward the non-skin-facing side T2. When the bodily fluid reaches the overlapping portion P1, the superabsorbent polymer 32 retains the bodily fluid, making it difficult for the bodily fluid to reach the back sheet 20. Therefore, in the adhesive part 50 of the overlapping part P1, the moisture from the back sheet 20 side does not reach easily, and adhesive force can be maintained. The adhesive force of the adhesive part 50 can be maintained in the overlapping part P1, and it can suppress that the absorbent article 1 deviates carelessly with respect to underwear. It can be continuously worn in place on the body and can inhibit the leakage of bodily fluids. Therefore, it is possible to reduce stuffiness and improve the wearing feeling, and it can be continuously worn at an appropriate position on the body, thereby suppressing leakage of bodily fluids.

In the outer region RO, the non-arrangement part P2 in which the superabsorbent polymer 32 and the adhesive part 50 are not arranged is provided. In the non-arrangement portion P2, the top sheet 10 and the back sheet 20 are arranged from the skin-facing side T1 toward the non-skin-facing side T2. Since the non-arrangement part P2 is not arranged with the superabsorbent polymer 32 and the adhesive part 50, it has higher air permeability than the part where the superabsorbent polymer 32 and the adhesive part 50 are arranged. Air permeability can be ensured by this non-arrangement part P2. Therefore, stuffiness can be further reduced and the wearing feeling can be improved.

In the outer region RO, a polymer arrangement part P3 in which the superabsorbent polymer 32 is arranged and the adhesive part 50 is not arranged is provided. In the polymer placement part P3, the top sheet 10 and the back sheet 20 are arranged from the skin-facing side T1 toward the non-skin-facing side T2. The polymer arrangement part P3 is a part where the adhesive part 50 is not arranged, so it is not attached to the underwear and is relatively easy to move, so the superabsorbent polymer 32 is easily deformed (swelled). The superabsorbent polymer 32 disposed in the polymer placement portion swells more easily than the superabsorbent polymer 32 disposed in the overlapping portion, and can ensure the absorption performance of body fluids.

In the outer region RO, an adhesive arrangement part P4 in which the adhesive part 50 is arranged and the superabsorbent polymer 32 is not arranged is provided. In the adhesive arrangement part P4, the surface sheet 10, the back sheet 20, and the adhesive part 50 are arrange|positioned from the skin-facing surface side T1 toward the non-skin-facing surface side T2. The polymer placement part P3 may be adjacent to at least one of the adhesive placement part P4 and the non-placement part P2 in plan view. The superabsorbent polymer 32 of the polymer placement part P3 can absorb not only the body fluid reaching the polymer placement part P3 but also the surrounding moisture. Therefore, it is possible to reduce moisture in the adhesive placement portion P4 adjacent to the polymer placement portion P3, the non-arrangement portion P2, and the like. According to such a configuration, air can pass through the adhesive arrangement portion P4 without allowing moisture to pass, and the adhesive force of the adhesive portion 50 can be maintained.

In the outer region RO, a press section 60 for compressing the top sheet 10 and the back sheet 20 in the thickness direction T may be provided. The pressing portion 60 is provided along the outer edge 1E of the absorbent article 1 . A plurality of pressing parts 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 intervals therebetween. By providing the squeeze part 60, even if the body fluid reaches the squeeze part 60 in the outer region RO, the body fluid will diffuse in the high-density squeeze part 60, so that the body fluid is less likely to reach outside the squeeze part 60. In addition, the superabsorbent polymer 32 may not be arranged in the non-arrangement part and the adhesive arrangement part of the outer region RO, and when the press part 60 is formed, the back sheet and the like are less likely to be damaged. Therefore, it is possible to ensure adhesion to close-fitting clothing, or to suppress leakage of bodily fluids caused by damage to the sheet.

In the press section 60, the front sheet 10, the back sheet 20, and the adhesive section 50 can also be compressed in the thickness direction. The back sheet 20, the surface sheet 10, and the adhesive part 50 are compressed together, so that the back sheet 20 and the adhesive part 50 enter into the recess formed together. Therefore, even if moisture reaches the adhesive part 50, the adhesiveness decreases, and the adhesive part 50 and the adhesive part 50 The back sheet 20 is also not easy to peel off.

The elongation strength of the back sheet 20 is higher than that of the surface sheet 10 . More preferably, the elongation strength of the back sheet 20 is higher than that of other materials (surface sheet, absorber, etc.) constituting the absorbent article. Here, the elongation strength is a value indicating the degree of difficulty in stretching a sheet in the planar direction, and specifically, it can be measured by the following measurement method. (1) Performed using a tensile testing machine and (2) a punching die (rectangular die length 44 mm x width 25 mm). The procedure is first to prepare a test piece. The test piece is prepared by immersing an absorbent article in toluene, dividing it into a front sheet and a back sheet, and punching out the sheet to be measured with a size of 45mm×25mm with a punching die. In order to obtain a pinching interval of 30 mm at the center of the test piece, grippers were provided on both ends of the test piece in the longitudinal direction (45 mm) up to a length of 7 mm. The gripping part is made of an aluminum strip with a length of 50 mm and a width of 30 mm, which pinches the test piece from both sides. Next, measurement was performed at a pinch interval: 30 mm, and a pulling speed: 500 mm/min. Measure the strength (N/25mm) and maximum elongation strength (N/25mm) at 5% elongation in the length direction and width direction respectively.

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

The elongation strength of the back sheet 20 is higher than the elongation strength of the front sheet 10, therefore, when the press section 60 is formed, the back sheet 20 is less likely to be stretched, and the back sheet 20 is less likely to become thin. Therefore, it is difficult for moisture to permeate through the pressing portion 60 , and it is possible to suppress the decrease in the strength of the adhesive portion 50 caused by the arrival of moisture. Also, because the elongation strength of the back sheet 20 is high, the back sheet 20 is not easy to elongate, so the height of the concavities and convexities of the press portion on the back sheet 20 side is lower than the height of the concavities and convexities of the press portion on the surface sheet 10 side. Therefore, the gap between the underwear and the back sheet can be narrowed, and the absorbent article can be stably fixed to the underwear. In addition, the front sheet of 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 tends to be low.

The ratio of the elongation strength in the width direction of the back sheet to the elongation strength in the longitudinal direction of the back sheet is 0.7 or more and 1.3 or less. More preferably, this ratio is not less than 0.9 and not more than 1.1. Since the ratio of the elongation strength in the width direction of the back sheet to the elongation strength in the longitudinal direction of the back sheet is 0.7 to 1.3, the difference between the elongation strength in the length direction and the elongation strength in the width direction of the back sheet is small. In the press section, the back sheet is less likely to be dented in the thickness direction. Therefore, the gap between the underwear and the back sheet can be narrowed, and the absorbent article can be stably fixed to the underwear.

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 2.0 N/25 mm or more, more preferably 5.0 N/25 mm or more. Since the elongation strength of the back sheet is 2.0N/25mm or more, it is stronger than the force applied to the back sheet when the absorbent article is peeled off from the underwear, thereby preventing the back sheet from being accidentally damaged.

The outer region RO has, as shown in FIG. 3 , the first region R1 on the absorber 30 side, and the 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 absorber 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 superabsorbent polymer 32 in the first region R1 has a high density, and can hold bodily fluids that cannot be completely held by the absorbent body 30 . The second region R2 is in contact with the sweat-prone region separated from the excretion part. The second region R2 can reliably absorb sweat with less water discharge than excrement. Also, since the density of the superabsorbent polymer in the second region R2 is low, it is possible to reduce discomfort to the skin due to unevenness when the superabsorbent polymer 32 expands. In addition, as a method of measuring the density, a test piece having the same area is cut out in the first region and the second region, and the superabsorbent polymer contained in the test piece is taken out, and the density can be measured by measuring the weight.

The density of the superabsorbent polymer 32 in the outer region RO located on the outer side in the width direction W than the absorber 30 is higher than that in the second region RO located on the outer side in the longitudinal direction L than the absorber 30 The superabsorbent polymer 32 has a higher density. The outer region RO positioned on the outer side in the width direction W than the absorber 30 is likely to be abutted by the base of the wearer's foot. Moisture due to sweat or the like can be absorbed in the area that is in contact with the base of the foot that is prone to sweat. In addition, as the measuring method of the density, in the same manner as the measuring method of the first area and the second area, a test piece of the same area is cut out in each area, the superabsorbent polymer contained in the test piece is taken out, and the weight is measured. , whereby the density can be determined.

In the absorbent body, the density of the superabsorbent polymer 32 may be constant or different. Alternatively, 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 density 32 of the superabsorbent polymer in the central region, the central region RC tends to swell when absorbing body fluids. Therefore, the absorption capacity of bodily fluid can be ensured. In addition, the density of the superabsorbent polymer 32 in the surface-side region RS is low, and the surface-side region RS is less likely to swell when absorbing body fluid. In the surface side region RS, since the unevenness caused by the expansion of the superabsorbent polymer 32 is not easily formed, the unevenness of the absorber becomes less likely to be transmitted to the surface sheet 10, the back sheet 20, etc. located outside the thickness direction of the absorber. . It is possible to reduce discomfort during wearing due to unevenness transmitted to the surface sheet 10, the back sheet 20, and the like. Furthermore, as a method of measuring the density, the absorbent article is cut in a section along the thickness direction, and the section is imaged with an electronic photograph, and the superabsorbent polymer content contained in the same area of each region is measured. The quantity of the substance is determined as the greater the quantity, the higher the density.

The degree of hydrophilicity of the side T1 facing the skin of the absorber 30 may be higher than the degree of hydrophilicity of the side T2 of the non-skin facing side of the absorber 30 . Here, the degree of hydrophilicity refers to the water-absorbing strength of the absorbent body, and the side with a higher degree of hydrophilicity has a stronger force of absorbing liquid than the side with a lower degree of hydrophilicity. Since the skin-facing side T1 of the absorber 30 has a high degree of hydrophilicity, body fluid excreted into the top sheet 10 can be quickly absorbed, and the superabsorbent polymer 32 in the absorber 30 can retain the body fluid. Moreover, since the non-skin-facing side T2 of the absorber 30 has a low degree of hydrophilicity, bodily fluids in the absorber 30 are less likely to reach the back sheet 20 . Therefore, the moisture of the bodily fluid becomes less likely to reach the adhesive portion 50, the reduction of the adhesive force due to the arrival of the moisture can be suppressed, and the shifting of the absorbent article can be suppressed.

As a method of making the hydrophilicity of the absorber different in the thickness direction, for example, the absorber is composed of two layers: an upper layer on the skin-facing side and a lower layer on the non-skin-facing side, and the upper layer and the lower layer Adhesives for immobilizing absorbent materials vary in their degree of 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 not containing a hydrophilic agent can be used.

In addition, the degree of hydrophilicity can be measured by the following method. (1) Five filter papers are stacked and placed horizontally, and the test piece to be measured is placed on the filter paper. (2) Marks were given to the test piece at intervals of 2 cm in the vertical direction and the horizontal direction, respectively. Then use a dropper to drop 1 drop of artificial urine (about 0.05g) to 20 sites. The dripping of artificial urine is carried out at 20 sites in 1 minute and 10 seconds. (3) After leaving to stand for 30 seconds after completion of dripping at 20 locations, the locations absorbed by the test piece were calculated. The more absorption sites of the test piece, the higher the hydrophilicity.

In the outer region RO, the skin-facing surface of the back sheet 20 is provided with an adhesive portion 70 coated with an adhesive for bonding the front sheet 10 and the back sheet 20 . As an adhesive agent, a hot-melt adhesive type adhesive agent is mentioned, for example. The superabsorbent polymer 32 is bonded to the back sheet 20 through the bonding portion on the back sheet side. The bodily fluid can be retained until the body fluid reaches the adhesive portion 50 provided on the back sheet 20 , making it easier to maintain the adhesive force of the adhesive portion 50 . Furthermore, since the superabsorbent polymer 32 and the surface sheet 10 are not bonded, a space for the superabsorbent polymer 32 to expand is easily formed on the surface sheet 10 side, and the superabsorbent polymer 32 becomes easy to expand.

As shown in FIG. 1, the absorbent article 1 has the 3rd area|region R3 located in the center of the longitudinal direction L, and the 4th area|region R4 located in the outer side of the longitudinal direction L rather than the 3rd area. 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 longitudinal 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 pressing part 60 may be provided across the third region R3 and the fourth region R4. The press part 60 in the fourth region R4 has a wide width part 61 whose length in the width direction W is longer than that of the press part 60 in the third region R3. The wide portion 61 is a hatched area in FIG. 2 . The press section 60 in the third region R3 and the press section 60 located on the inner side in the longitudinal direction L than the wide section 61 in the fourth region R4 are linear press sections 65 connected by a plurality of circular arcs. The linear press part 65 is further inside, and the dot press part 66 arrange|positioned along this linear press part 60 is comprised. That is, two rows of press sections are arranged. On the other hand, in the wide-width portion 61 , on the outer side and the inner side of a plurality of circular arc-connected linear squeezing portions 65 , dot-shaped squeezing portions 66 arranged along the linear squeezing portions 65 are respectively provided. That is, three rows of press sections are arranged. The wide portion 61 may be provided at the position of the maximum width PM of the fourth region. The outer edge of the absorbent article having the largest width in the fourth region is easily applied by an external force such as the strength of the foot. Since the wide portion 61 is provided at the position of the maximum width, the wide portion 61 of the press portion 60 can increase the rigidity of the position of the maximum width, and can prevent the absorbent article from twisting or shifting from the underwear due to external force. lack of.

In addition, the wide-width portion 61 may overlap with the adhesive portion 51 located on the outermost side in the longitudinal direction L in the width direction W. The state overlapping in the width direction W refers to the state in which the adhesive portion 51 is arranged on an extension line extending in the width direction W of the wide portion 61 . The adhesive portion 51 located on the outermost side in the length direction is easy to receive the force along the length direction L from the body, underwear, etc. Since the adhesive portion 51 overlaps with the wide-width portion 61 in the width direction W, the rigidity of the outermost adhesive portion 51 can be increased by the wide-width portion 61 of the pressing portion 60, and the twisting of the absorbent article due to external force can be suppressed. Or lack of offset from underclothes.

More desirably, the adhesive portion 51 located on 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 rigidity of the outermost adhesive portion 50 can be further increased by the wide width portion 61 of the pressing portion 60 , which can prevent the absorbent article from being twisted or deviated from the underwear due to external force.

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

For example, in the absorbent article of the modified example, an adhesive portion is provided on the non-skin-facing surface of the surface sheet 10 in the outer region RO, and an adhesive agent for bonding the surface sheet 10 and the back sheet 20 is applied thereto. The superabsorbent polymer 32 is adhered to the surface sheet 10 through the bonding portion on the surface sheet 10 side. Therefore, the body fluid penetrating through the top sheet 10 can be immediately absorbed on the top sheet 10 side. Furthermore, since the superabsorbent polymer 32 and the back sheet 20 are not bonded, a space for the superabsorbent polymer 32 to expand is easily formed on the back sheet 20 side, and the superabsorbent polymer 32 becomes easy to swell. Also, when the non-skin-facing surface of the surface sheet 10 is made of an air-through nonwoven fabric, the superabsorbent polymer 32 is likely to enter into the nonwoven fabric with high bulkiness and large interfiber gaps. Therefore, it is easier to form a space for swelling on the side of the back sheet 20 of the superabsorbent polymer 32, and the absorption performance can be improved.

Furthermore, this specification is written by referring to all contents of Japanese Patent Application No. 2018-052339 filed on March 20, 2018. [industrial availability]

According to the present invention, it is possible to provide an absorbent article that can reduce stuffiness and improve wearing comfort, and can be continuously worn at an appropriate position on the body, whereby leakage of bodily fluids can be suppressed.

1‧‧‧Absorbent articles 10‧‧‧Surface flakes 20‧‧‧back sheet 30‧‧‧absorbent 31‧‧‧Pulp 32‧‧‧Superabsorbent polymer 50‧‧‧adhesive part 51‧‧‧adhesive part located on the outermost side in the length direction 60‧‧‧press section 61‧‧‧wide part 70‧‧‧Continuation RO‧‧‧outer area R1‧‧‧1st area R2‧‧‧Region 2 R3‧‧‧The third area R4‧‧‧4th area RC‧‧‧central area RS‧‧‧surface side area P1‧‧‧overlapping part P2‧‧‧Non-Configuration Department P3‧‧‧Polymer Configuration Department P4‧‧‧Adhesive configuration department PM‧‧‧maximum width T‧‧‧thickness direction T1‧‧‧Skin facing side T2‧‧‧Non-skin facing side

Fig. 1 is a plan view of the absorbent article of the embodiment viewed from the skin-facing side. Fig. 2 is a plan view of the absorbent article shown in Fig. 1 viewed from the non-skin facing side. Fig. 3 is a schematic sectional view along line A-A of the absorbent article shown in Fig. 1 . Fig. 4 is a schematic sectional view along line B-B of the absorbent article shown in Fig. 1 .

1‧‧‧Absorbent articles

10‧‧‧Surface flakes

20‧‧‧back sheet

30‧‧‧absorbent

31‧‧‧Pulp

32‧‧‧Superabsorbent polymer

50‧‧‧adhesive part

70‧‧‧Continuation

RO‧‧‧outer area

R1‧‧‧1st area

R2‧‧‧Region 2

RC‧‧‧central area

RS‧‧‧surface side area

T‧‧‧thickness direction

T1‧‧‧Skin facing side

T2‧‧‧Non-skin facing side

Claims (14)

An absorbent article comprising: a longitudinal direction and a width direction perpendicular to each other; a liquid-permeable top sheet; an air-permeable and liquid-impermeable back sheet; disposed between the front sheet and the back sheet, at least The absorbent body of pulp and superabsorbent polymer; and the adhesive part provided on the non-skin-facing surface of the aforementioned back sheet, characterized in that the outer edge of the aforementioned absorbent body is located more inside than the outer edge of the aforementioned absorbent article, In the outer region between the outer edge of the absorbent body and the outer edge of the absorbent article, an overlapping portion where the superabsorbent polymer and the adhesive portion overlap in the thickness direction is provided, and in the outer region, the The superabsorbent polymer and the polymer disposition part that is not provided with the aforementioned adhesive part are provided with the aforementioned adhesive disposition part and the aforementioned superabsorbent polymer is not disposed on the aforementioned outer region, and the aforementioned adhesive disposition part and the aforementioned The polymer placement parts are adjacent to each other in plan view. An absorbent article has: a length direction and a width direction orthogonal to each other; A liquid-permeable top sheet; an air-permeable and liquid-impermeable back sheet; an absorber having at least pulp and a superabsorbent polymer disposed between the front sheet and the back sheet; The adhesive part of the non-skin-facing surface is characterized in that the outer edge of the absorbent body is located inside the outer edge of the absorbent article, and the outer edge of the absorbent article is located between the outer edge of the absorbent article and the outer edge of the absorbent article. In the outer region, there is an overlapping portion where the superabsorbent polymer and the adhesive portion overlap in the thickness direction, and in the outer region, there is a pressing portion that compresses at least the front sheet and the back sheet in the thickness direction. The section is arranged along the outer edge of the absorbent article, and in the press section, the top sheet, the back sheet, and the adhesive section are compressed in the thickness direction. The absorbent article according to Claim 2 of the patent application, wherein the elongation strength of the aforementioned back sheet is higher than that of the aforementioned surface sheet. The absorbent article according to claim 3, wherein the ratio of the elongation strength of the back sheet in the width direction to the elongation strength of the back sheet in the longitudinal direction is 0.7 to 1.3. The absorbent article according to claim 3 or 4, wherein both the elongation strength of the back sheet in the longitudinal direction and the elongation strength of the back sheet in the width direction are 2.0 N/25mm or more. The absorbent article according to any one of claims 2 to 4 of the patent claims, wherein the absorbent article has: a third region located at the center of the aforementioned longitudinal direction; and a third region located closer to the aforementioned longitudinal direction than the aforementioned third region In the fourth area outside the 4th area, the maximum width in the width direction of the 4th area is longer than the maximum width in the width direction of the 3rd area. The above-mentioned press part of the above-mentioned 3rd zone is a longer width wide part, and the aforementioned wide width part is provided at the position of the aforementioned maximum width of the above-mentioned 4th zone. The absorbent article according to claim 6 of the patent application, wherein the above-mentioned adhesive parts are plural, extend along the aforementioned width direction and are provided in the aforementioned longitudinal direction at intervals, and the aforementioned adhesive parts located on the outermost side in the aforementioned longitudinal direction The portion overlaps the wide-width portion in the width direction. The absorbent article according to claim 7 of the patent application, wherein the adhesive portion located on the outermost side in the longitudinal direction reaches the outer edge of the absorbent article and overlaps the wide width portion in the thickness direction. The absorbent article according to any one of claims 1 to 4 of the patent claims, wherein, on the outer region, on the skin-facing surface of the back sheet, there is an adhesive portion coated with the surface sheet Adhesive for bonding with the aforementioned back sheet. The absorbent article according to any one of claims 1 to 4 of the patent application, wherein, on the outer region, on the non-skin-facing surface of the surface sheet, there is an adhesive portion coated with Adhesive for bonding the sheet to the aforementioned back sheet. The absorbent article according to any one of claims 1 to 4 of the patent claims, wherein a non-arrangement portion where the superabsorbent polymer and the adhesive portion are not arranged is provided in the outer region. The absorbent article according to any one of claims 1 to 4 of the patent claims, wherein the outer region has a first region on the absorber side and a second region on the outer edge side of the absorbent article, and the first The density of the superabsorbent polymer in the region is higher than the density of the superabsorbent polymer in the second region. The absorbent article according to any one of claims 1 to 4 of the patent claims, wherein the absorbent system has a central region including the center of the absorbent body in the thickness direction; and is located closer to the thickness than the central region In the outer surface side region in the direction, the density of the superabsorbent polymer in the central region is higher than the density of the superabsorbent polymer in the surface side region. The absorbent article according to any one of claims 1 to 4, wherein the hydrophilicity of the skin-facing side of the absorber is higher than that of the non-skin-facing side of the absorber.

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