JP7079658B2 - Absorbent article - Google Patents

Description

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

Conventionally, absorbent articles that are attached to underwear and absorb body fluids such as vaginal discharge, sweat, and urine have been used. The absorbent article of Patent Document 1 is arranged between the front surface sheet, the back surface sheet, the front surface sheet and the back surface sheet, and is arranged on the non-skin facing surface of the back surface sheet and the absorber having at least pulp and a highly absorbent polymer. It has an adhesive portion and a bonded portion. The back sheet of Patent Document 1 is made of a non-breathable or breathable film (paragraph 0019 of Patent Document 1).

JP 2015-15481

Patent Document 1 describes that stuffiness can be reduced by forming the back sheet with a breathable film. However, an adhesive portion is provided on the non-skin facing surface of the back surface sheet, and moisture may reach the adhesive portion via the breathable back surface sheet. When moisture reaches the adhesive portion, the adhesive strength of the adhesive portion may be weakened. As a result, the absorbent article unintentionally shifts with respect to the underwear and cannot be continuously worn at an appropriate position with respect to the body, which may cause leakage of body fluid.

Therefore, there is a demand for an absorbent article that can suppress the leakage of body fluid by continuously wearing it at an appropriate position with respect to the body while reducing stuffiness and improving the wearing feeling.

The absorbent article according to one embodiment is arranged in the longitudinal direction and the width direction orthogonal to each other, a liquid permeable front sheet, a breathable and liquid permeable back sheet, and between the front surface sheet and the back surface sheet. It is an absorbent article having at least an absorbent body having pulp and a highly absorbent polymer, and an adhesive portion arranged on a non-skin facing surface of the back surface sheet, and the outer edge of the absorbent body is the absorbent body. It is located inside the outer edge of the article, and the highly absorbent polymer and the adhesive portion are arranged so as to overlap each other in the thickness direction in the outer region between the outer edge of the absorber and the outer edge of the absorbent article. A superimposing portion is provided.

It is a top view seen from the skin facing surface side of the absorbent article which concerns on embodiment. FIG. 3 is a plan view of the absorbent article shown in FIG. 1 as viewed from the non-skin facing surface side. It is a schematic cross-sectional view along the AA cross section of the absorbent article shown in FIG. It is a schematic cross-sectional view along the BB cross section of the absorbent article shown in FIG.

(1) Outline of Embodiment At least the following matters will be clarified by the description of this specification and the attached drawings.
The absorbent article according to one embodiment is arranged in the longitudinal direction and the width direction orthogonal to each other, a liquid permeable front sheet, a breathable and liquid permeable back sheet, and between the front surface sheet and the back surface sheet. It is an absorbent article having at least an absorbent body having pulp and a highly absorbent polymer, and an adhesive portion arranged on a non-skin facing surface of the back surface sheet, and the outer edge of the absorbent body is the absorbent body. It is located inside the outer edge of the article, and the highly absorbent polymer and the adhesive portion are arranged so as to overlap each other in the thickness direction in the outer region between the outer edge of the absorber and the outer edge of the absorbent article. A superimposing portion is provided.

According to this embodiment, the highly absorbent polymer is arranged in the region where the absorber is arranged and the outer region. Therefore, even when urine is excreted beyond the absorber, the highly absorbent polymer in the outer region can retain urine or the like. Further, since the back sheet has breathability, moisture is easily discharged to the outside of the absorbent article through the back sheet when urine or sweat is absorbed. Therefore, it is possible to reduce stuffiness and improve the wearing feeling. The outer region is provided with a superposed portion in which the highly absorbent polymer and the adhesive portion are overlapped in the thickness direction. When the body fluid reaches the superposed portion, the body fluid is retained by the highly absorbent polymer, and it is difficult for the body fluid to reach the back sheet. Therefore, it is difficult for moisture from the back surface sheet side to reach the adhesive portion in the overlapping portion, and the adhesive strength can be maintained. It can be continuously worn in an appropriate position with respect to the body, and leakage of body fluid can be suppressed.

According to a preferred embodiment, the outer region may be provided with the highly absorbent polymer and a non-arranged portion in which the adhesive portion is not arranged.

According to this aspect, since the highly absorbent polymer and the adhesive portion are not arranged in the non-arranged portion, the non-arranged portion has higher air permeability than the portion in which the highly absorbent polymer is arranged and the portion in which the adhesive portion is arranged. Have. Breathability can be ensured by the non-arranged portion. The stuffiness can be further reduced and the fit can be improved.

In the absorbent article according to another aspect, the outer region may be provided with a polymer-arranged portion in which the highly absorbent polymer is arranged and the adhesive portion is not arranged.

According to this aspect, since the polymer arranging portion does not have an adhesive portion and is a portion that easily moves with respect to the underwear, the highly absorbent polymer is easily deformed (swelled). The highly absorbent polymer arranged in the polymer arranging portion is easier to swell as compared with the highly absorbent polymer arranged in the superimposing portion, and the absorption performance of body fluid can be ensured.

According to a preferred embodiment, the outer region is provided with an adhesive arrangement portion in which the adhesive portion is arranged and the highly absorbent polymer is not arranged, and the adhesive arrangement portion and the polymer arrangement portion are flat. It may be adjacent visually.

According to this aspect, the highly absorbent polymer in the polymer-arranged portion can absorb not only the body fluid that has reached the polymer-arranged portion but also the surrounding moisture. Therefore, the humidity of the adhesive arrangement portion adjacent to the polymer arrangement portion can be reduced. In the adhesive arrangement portion, air can be permeated without allowing moisture to pass through, and the adhesive strength of the adhesive portion can be maintained.

According to a preferred embodiment, the outer region comprises a first region on the absorber side and a second region on the outer edge side of the absorbent article, the density of the highly absorbent polymer in the first region. May be higher than the density of the highly absorbent polymer in the second region.

According to this aspect, the first region has a high density of the highly absorbent polymer and can hold the body fluid that the absorber could not hold. The second region abuts on a sweat-prone region away from the excretory portion. The second region can reliably absorb sweat, which emits less water than excrement. Further, since the density of the highly absorbent polymer in the second region is low, it is possible to reduce the discomfort to the skin due to the unevenness when the highly absorbent polymer expands.

According to a preferred embodiment, the absorber has a central region including the center in the thickness direction of the absorber and a surface side region located outside the central region in the thickness direction, and the center. The density of the highly absorbent polymer in the region may be higher than the density of the highly absorbent polymer in the surface side region.

According to a preferred embodiment, the hydrophilicity of the absorber on the skin-facing surface side may be higher than the hydrophilicity of the absorber on the non-skin-facing surface side.

According to this aspect, since the hydrophilicity of the absorber on the skin-facing surface side is high, the body fluid excreted on the surface sheet can be quickly drawn in, and the body fluid can be retained by the highly absorbent polymer in the absorber. In addition, since the hydrophilicity of the absorber on the non-skin facing surface side is low, it becomes difficult for the body fluid in the absorber to reach the back sheet. Therefore, it becomes difficult for the water content of the body fluid to reach the adhesive portion, the decrease in the adhesive force due to the arrival of the water content can be suppressed, and the kinking of the absorbent article can be suppressed.

According to this aspect, the density of the highly absorbent polymer in the central region is high, and the central region tends to expand when the body fluid is absorbed. Therefore, the absorption capacity of body fluid can be secured. In addition, the density of the highly absorbent polymer in the surface side region is low, and the surface side region is unlikely to swell when the body fluid is absorbed. Since it is difficult to form irregularities on the front surface side region due to the swelling of the highly absorbent polymer, it is difficult for the irregularities of the absorber to be transmitted to the front surface sheet and the back surface sheet located outside in the thickness direction of the absorber. It is possible to reduce the discomfort during mounting due to the unevenness transmitted to the front and back sheets.

According to a preferred embodiment, the outer region is provided with at least a compressed portion obtained by compressing the front surface sheet and the back surface sheet in the thickness direction, and the compressed portion is arranged along the outer edge of the absorbent article. May be done.

According to this aspect, even if the body fluid reaches the squeezed portion, the body fluid diffuses in the squeezed portion having a high density, and it becomes difficult for the body fluid to reach the outside of the squeezed portion.

According to a preferred embodiment, in the compressed portion, the front surface sheet, the back surface sheet, and the adhesive portion may be compressed in the thickness direction.

According to this aspect, when the back surface sheet, the front surface sheet and the adhesive portion are compressed together, the back surface sheet and the adhesive portion both enter the recess due to the squeezed portion, so that moisture reaches the adhesive portion and the adhesiveness is increased. Even if it is lowered, the adhesive part and the back sheet are hard to peel off.

According to a preferred embodiment, the elongation strength of the back surface sheet may be lower than the elongation strength of the front surface sheet.

According to this aspect, the back surface sheet is difficult to stretch and the back surface sheet is difficult to be thinned when the pressed portion is formed. Therefore, it is difficult for moisture to permeate through the squeezed portion, and it is possible to suppress a decrease in the strength of the adhesive portion due to the arrival of moisture. Further, since the elongation strength of the back surface sheet is low, the height of the unevenness due to the pressed portion on the back surface sheet side is lower than the height of the unevenness due to the pressed portion on the front surface sheet side. Therefore, the gap between the underwear and the back sheet can be reduced, and the absorbent article can be stably fixed to the underwear.

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

According to this aspect, there is little variation in the elongation strength in the longitudinal direction and the elongation strength in the width direction of the back surface sheet, and the back surface sheet is less likely to be dented in the thickness direction when the pressed portion is formed. Therefore, the gap between the underwear and the back sheet can be reduced, and the absorbent article can be stably fixed to the underwear.

According to a preferred embodiment, the elongation strength of the back surface sheet in the longitudinal direction and the elongation strength of the back surface sheet in the width direction may be 2.0 N / 25 mm or more.

According to this aspect, the elongation strength in the longitudinal direction of the back surface sheet and the elongation strength in the width direction of the back surface sheet are stronger than the force applied to the back surface sheet when the absorbent article is peeled off from the underwear, and the back surface sheet is unintentionally torn. Can be suppressed.

According to a preferred embodiment, the absorbent article has a third region located in the center of the longitudinal direction and a fourth region located outside the third region in the longitudinal direction. The maximum width in the width direction of the four regions is longer than the maximum width in the width direction of the third region, and the squeezed portion of the fourth region is wider than the squeezed portion of the third region. It has a wide portion having a long length, and the wide portion may be provided at the position of the maximum width in the fourth region.

The outer edge of the absorbent article in the maximum width of the fourth region is likely to be subjected to an external force such as a leg force. Since the wide portion is provided at the maximum width position, the rigidity of the maximum width position can be increased by the wide portion of the squeezing portion, and the trouble that the absorbent article is twisted or displaced from the underwear due to the external force is suppressed. can.

According to a preferred embodiment, the adhesive portions extend along the width direction and are provided at intervals in the longitudinal direction, and the adhesive portion located on the outermost side in the longitudinal direction is the adhesive portion. It may overlap with the wide portion in the width direction.

The adhesive portion located on the outermost side in the longitudinal direction is susceptible to a force along the longitudinal direction from the body or underwear. Since the adhesive portion overlaps the wide portion in the width direction, the rigidity of the adhesive portion located on the outermost side can be increased by the wide portion of the squeezed portion, and the absorbent article is twisted or displaced from the underwear due to the external force. Problems can be suppressed.

According to a preferred embodiment, 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 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 squeezed portion, and it is possible to suppress the trouble that the absorbent article is twisted or displaced from the underwear due to the external force.

According to a preferred embodiment, in the outer region, an adhesive portion for adhering the front surface sheet and the back surface sheet may be provided on the skin-facing surface of the back surface sheet.

According to this aspect, the highly absorbent polymer is adhered to the back sheet by the adhesive portion on the back sheet side. The body fluid can be held immediately before the body fluid reaches the adhesive portion provided on the back sheet, and it is easier to maintain the adhesive strength of the adhesive portion. In addition, since the high-absorbent polymer and the surface sheet are not adhered to each other, a space for the high-absorbent polymer to swell is likely to be formed on the surface sheet side, and the high-absorbent polymer is likely to swell.

According to another aspect, in the outer region, an adhesive portion for adhering the front surface sheet and the back surface sheet may be provided on the non-skin facing surface of the front surface sheet.

According to this aspect, the highly absorbent polymer is adhered to the surface sheet by the adhesive portion on the surface sheet side. Therefore, the body fluid permeated from the surface sheet can be immediately absorbed on the surface sheet side. In addition, since the high-absorbent polymer and the back sheet are not adhered to each other, a space for the high-absorbent polymer to swell is likely to be formed on the back sheet side, and the high-absorbent polymer is likely to swell.

(2) Overall Outline of Absorbable Articles The absorbent articles according to the embodiment will be described below with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, there may be a portion where the relationship and ratio of the dimensions of the drawings are different from each other.

The absorbent article is a panty liner. The absorbent article according to the present invention may be any absorbent article used by being attached to underwear, and may be, for example, a light incontinence pad. FIG. 1 is a plan view of the absorbent article 1 according to the present embodiment as viewed from the skin facing surface side. FIG. 2 is a plan view of the absorbent article shown in FIG. 1 as viewed from the non-skin facing surface side. FIG. 3 is a schematic cross-sectional view taken along the AA cross section of the absorbent article shown in FIG. FIG. 4 is a schematic cross-sectional view taken along the BB cross section of the absorbent article shown in FIG.

The absorbent article 1 has a longitudinal direction L and a width direction W that are orthogonal to each other. The longitudinal direction L is defined by the direction extending to the anterior side and the posterior side of the body. In other words, the longitudinal direction L is the direction extending back and forth in the deployed absorbent article 1. Further, the absorbent article 1 has both the longitudinal direction L and the width direction W orthogonal to each other in the thickness direction T. The thickness direction T extends to 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 has at least a front surface sheet 10, a back surface sheet 20, and an absorber 30. The surface sheet 10 may be made of a liquid-permeable sheet such as a non-woven fabric or a perforated plastic film. The surface sheet 10 may be configured by laminating a plurality of sheets, or may have a second sheet. For example, the surface sheet 10 may be composed of a skin-side sheet made by laminating a cotton sheet containing cotton fibers and a sheet made of rayon and polyethylene, or the skin-side sheet and a second sheet made of an air-through non-woven fabric. , May form the surface sheet 10. The surface sheet 10 of the present embodiment is made of an air-through nonwoven fabric. More preferably, the surface of the surface sheet 10 on the absorber side may be made of an air-through nonwoven fabric. The air-through nonwoven fabric has relatively large voids between fibers, which makes it easy to uniformly arrange the highly absorbent polymer of the absorber described later. Therefore, the highly absorbent polymer is likely to swell over the entire absorbent article, and the absorption performance can be improved.

The back sheet 20 may be composed of a breathable and liquid-impermeable sheet such as a plastic film. Since the back sheet 20 has breathability, moisture is easily discharged to the outside of the absorbent article through the back sheet 20 when urine or sweat is absorbed. Therefore, it is possible to reduce stuffiness and improve the wearing feeling. The front surface sheet 10 and the back surface sheet 20 reach the outer edge of the absorbent article. In the present embodiment, the outer edge is the outer edge in the width direction W, the anterior edge is the anterior edge, and the posterior edge is the posterior edge. The outer edge is the edge of the entire outer circumference including the outer edge, the front edge, and the rear edge.

An adhesive portion 50 for attaching the absorbent article 1 to the underwear is arranged on the non-skin facing surface of the back sheet 20. A plurality of adhesive portions 50 extend in the width direction W and are provided at intervals in the longitudinal direction L. The adhesive portion 50 may 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. The adhesive portion 51 located on the outermost side in the longitudinal direction L may be located outside the maximum width PM of the absorbent article 1 in the longitudinal direction L. The maximum width PM of this absorbent article is the maximum width of the fourth region described later. In the modified example, the adhesive portion 50 may extend in the longitudinal direction L and may be arranged at intervals in the width direction W.

The absorber 30 is arranged between the front surface sheet 10 and the back surface sheet 20. The absorber 30 has at least pulp 31 and an absorbent material such as a highly absorbent polymer (SAP) 32. The absorber has pulp, and the pulp can absorb vaginal discharge. Further, the absorber has a highly absorbent polymer 32, and the highly absorbent polymer 32 can absorb urine and sweat. The absorber 30 may be a sheet-shaped absorber. The absorber 30 may have a core wrap that wraps 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 outside the central region RC in the thickness direction T. The surface side region RS is provided on the skin facing surface side T1 and the non-skin facing surface side T2 of 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 into three equal parts 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 edge 30F of the absorber 30 is located on the rear side of the front edge 1F of the absorbent article 1, and the trailing edge 30R of the absorber 30 is located on the front side of the trailing edge 1R of the absorbent article 1. The outer edge 30S of the absorber 30 is located inside the outer edge 1S of the absorbent article 1 in the width direction W. 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 shaded region in FIG. A front surface sheet 10 and a back surface sheet 20 are arranged in the outer region RO. In the outer region RO, the pulp 31 is not arranged, but the highly absorbent polymer 32 is arranged. The highly absorbent polymer 32 is arranged in the region where the absorber is arranged and the outer region. Therefore, even when urine is excreted beyond the absorber, the highly absorbent polymer 32 can retain urine or the like. In addition, the highly absorbent polymer 32 can adsorb ammonia components and gaseous ammonia dissolved in water, and can reduce odor.

The absorbent article of the present embodiment is used as a panty liner for a long period of time. The pulp absorbs body fluids such as vaginal discharge and sweat, and the highly absorbent polymer 32 can absorb body fluids due to light incontinence. In the absorbent article of the present embodiment, even if urine is absorbed as well as vaginal discharge, the breathable back sheet 20 allows moisture to escape to the outside, and it is possible to maintain a smooth wearing feeling.

FIG. 4 is a diagram schematically showing a cross section of an absorbent article in the outer region RO. The outer region RO is provided with a superposed portion P1 in which the highly absorbent polymer 32 and the adhesive portion 50 are arranged so as to overlap each other in the thickness direction T. A front surface sheet 10, a highly absorbent polymer 32, a back surface sheet 20, and an adhesive portion 50 are arranged on the superposed portion P1 from the skin facing surface side T1 to the non-skin facing surface side T2. When the body fluid reaches the overlapping portion P1, the body fluid is held by the highly absorbent polymer 32, and it is difficult for the body fluid to reach the back surface sheet 20. Therefore, the adhesive portion 50 in the overlapping portion P1 is difficult for moisture to reach from the back surface sheet 20 side, and can maintain the adhesive strength. The adhesive force of the adhesive portion 50 can be maintained in the overlapping portion P1, and the absorbent article 1 can be prevented from unintentionally shifting with respect to the underwear. It can be continuously worn in an appropriate position with respect to the body, and leakage of body fluid can be suppressed. Therefore, it is possible to suppress the leakage of body fluid by continuing to wear the body fluid at an appropriate position with respect to the body while reducing stuffiness and improving the wearing feeling.

The outer region RO may be provided with a non-arranged portion P2 in which the highly absorbent polymer 32 and the adhesive portion 50 are not arranged. In the non-arranged portion P2, the front surface sheet 10 and the back surface sheet 20 are arranged from the skin facing surface side T1 toward the non-skin facing surface side T2. Since the non-arranged portion P2 does not have the highly absorbent polymer 32 and the adhesive portion 50 arranged, the non-arranged portion P2 has higher air permeability than the portion where the highly absorbent polymer 32 is arranged and the portion where the adhesive portion 50 is arranged. .. Breathability can be ensured by the non-arranged portion P2. The stuffiness can be further reduced and the fit can be improved.

The outer region RO may be provided with a polymer-arranged portion P3 in which the highly absorbent polymer 32 is arranged and the adhesive portion 50 is not arranged. In the polymer arranging portion P3, the front surface sheet 10 and the back surface sheet 20 are arranged from the skin facing surface side T1 toward the non-skin facing surface side T2. Since the adhesive portion 50 is not arranged, the polymer arranging portion P3 is a portion that is relatively easy to move without being bonded to the underwear, and the highly absorbent polymer 32 is easily deformed (swelled). The highly absorbent polymer 32 arranged in the polymer arranging portion is easier to swell as compared with the highly absorbent polymer 32 arranged in the overlapping portion, and the absorption performance of body fluid can be further ensured.

The outer region RO may be provided with an adhesive arrangement portion P4 in which the adhesive portion 50 is arranged and the highly absorbent polymer 32 is not arranged. The front surface sheet 10, the back surface sheet 20, and the adhesive portion 50 are arranged in the adhesive arrangement portion P4 from the skin facing surface side T1 toward the non-skin facing surface side T2. The polymer-arranged portion P3 may be adjacent to at least one of the adhesive-arranged portion P4 and the non-arranged portion P2 in a plan view. The highly absorbent polymer of the polymer-arranged portion P3 can absorb not only the body fluid that has reached the polymer-arranged portion P3 but also the surrounding moisture. Therefore, the moisture of the adhesively arranged portion P4 and the non-arranged portion P2 adjacent to the polymer arranged portion P3 can be reduced. According to such a configuration, the adhesive arrangement portion P4 can allow air to pass through without allowing moisture to pass through, and can maintain the adhesive strength of the adhesive portion 50.

The outer region RO may be provided with a squeezing portion 60 in which the front surface sheet 10 and the back surface sheet 20 are compressed in the thickness direction T. The squeezing portion 60 may be provided along the outer edge 1E of the absorbent article 1. A plurality of pressing portions 60 may be provided inside the outer edge 1E of the absorbent article 1 and may be arranged along the outer edge 1E at intervals. Since the squeezing portion 60 is provided, even if the body fluid reaches the squeezing portion 60 of the outer region RO, the body fluid diffuses in the squeezing portion 60 having a high density, so that the body fluid reaches the outside of the squeezing portion 60. It becomes difficult to do. Further, the highly absorbent polymer 32 is not arranged in the non-arranged portion and the adhesive-arranged portion of the outer region RO, and the back surface sheet or the like is not easily torn when the pressed portion 60 is formed. Therefore, it is possible to secure the adhesiveness to the underwear and suppress the leakage of body fluid due to the tearing of the sheet.

In the pressing portion 60, the front surface sheet 10, the back surface sheet 20, and the adhesive portion 50 may be compressed in the thickness direction. When the back surface sheet 20, the front surface sheet 10 and the adhesive portion 50 are compressed together, the adhesive portion 50 enters the recess formed together with the back surface sheet 20, so that moisture reaches the adhesive portion 50 and is adhesive. The adhesive portion 50 and the back surface sheet 20 are difficult to peel off even if the pressure is lowered.

The elongation strength of the back surface sheet 20 may be higher than the elongation strength of the front surface sheet 10. More preferably, the elongation strength of the back surface sheet 20 may be higher than the elongation strength of other materials (front surface sheet, absorber, etc.) constituting the absorbent article. Here, the elongation strength is a value that indicates the difficulty of elongation of the sheet in the plane direction, and can be specifically measured by the following measuring method. This is performed using a (1) tensile tester and (2) a punching die (rectangular type, length 44 mm x width 25 mm). As a procedure, first, a test piece is prepared. The test piece is prepared by immersing the absorbent article in toluene, separating it into a front sheet and a back sheet, and punching the sheet to be measured with a size of 45 mm × 25 mm with a punching die. A grip portion is provided at each portion having a length from both ends in the longitudinal direction (45 mm) of the test piece to 7 mm so that a chuck interval of 30 mm can be taken in the center of the test piece. The grip portion is made by sandwiching the test piece from both sides with aluminum tape having a length of 50 mm and a width of 30 mm. Next, the measurement is performed at a chuck interval of 30 mm and a tensile speed of 500 mm / min. The strength (N / 25 mm) and the maximum elongation strength (N / 25 mm) at 5% elongation in the longitudinal direction and the width direction are measured.

The relationship between the elongation strength of the front surface sheet and the back surface sheet in the present invention is defined as follows. The 5% elongation strength in the longitudinal direction of the front surface sheet is higher than the 5% elongation strength in the longitudinal direction of the back surface sheet, and the 5% elongation strength in the width direction of the front surface sheet is in the width direction of the back surface sheet. When it is higher than the elongation strength of 5%, it is assumed that the elongation strength of the front surface sheet 10 is higher than the elongation strength of the back surface sheet. On the other hand, the elongation strength of 5% in the longitudinal direction of the front surface sheet is higher than the elongation strength of 5% in the longitudinal direction of the back surface sheet, and the elongation strength of 5% in the width direction of the front surface sheet is the width of the back surface sheet. When it is lower than the elongation strength of 5% in the direction, the elongation strength of 5% in the longitudinal direction of the front surface sheet is lower than the elongation strength of 5% in the longitudinal direction of the back surface sheet, and the elongation strength in the width direction of the front surface sheet is lower. When the elongation strength of 5% is lower than the elongation strength of 5% in the width direction of the back sheet, and the elongation strength of 5% in the longitudinal direction of the front sheet is the elongation strength of 5% in the longitudinal direction of the back sheet. When the elongation strength of 5% in the width direction of the front surface sheet is higher than the elongation strength of 5% in the width direction of the back surface sheet, the elongation strength of the back surface sheet 20 is higher than that of the front surface sheet 10. It is assumed that the elongation strength is higher than that of.

Since the elongation strength of the back surface sheet 20 is higher than the elongation strength of the front surface sheet 10, the back surface sheet 20 is difficult to be elongated and the back surface sheet 20 is difficult to be thinned when the pressing portion 60 is formed. Therefore, it is difficult for moisture to permeate through the pressing portion 60, and it is possible to suppress a decrease in strength of the adhesive portion 50 due to the arrival of moisture. Further, since the back sheet 20 has high elongation strength and the back sheet is difficult to stretch, the height of the unevenness due to the pressed portion on the back sheet 20 side is lower than the height of the unevenness due to the pressed portion on the front sheet 10 side. Therefore, the gap between the underwear and the back sheet can be reduced, and the absorbent article can be stably fixed to the underwear. The front surface sheet of the present embodiment is configured to be stretched in only one of the longitudinal direction and the width direction, and the back surface sheet is configured to be stretched 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 surface sheet to the elongation strength in the longitudinal direction of the back surface sheet may be 0.7 or more and 1.3 or less. More preferably, the ratio may be 0.9 or more and 1.1 or less. 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, so that the elongation strength in the longitudinal direction and the elongation strength in the width direction of the back sheet vary. The back sheet is less likely to be dented in the thickness direction when the pressed portion is formed. Therefore, the gap between the underwear and the back sheet can be reduced, and the absorbent article can be stably fixed to the underwear.

The elongation strength in the longitudinal direction of the back surface sheet and the elongation strength in the width direction of the back surface sheet may both be 2.0 N / 25 mm or more, and more preferably 5.0 N / 25 mm or more. When the elongation strength of the back sheet is 2.0 N / 25 mm or more, it is stronger than the force applied to the back sheet when the absorbent article is peeled off from the underwear, and it is possible to prevent the back sheet from being unintentionally torn.

As shown in FIG. 3, the outer region RO has 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 absorber 30. The density of the highly absorbent polymer 32 in the first region R1 may be higher than the density of the highly absorbent polymer 32 in the second region R2. The first region R1 has a high density of the highly absorbent polymer 32 and can hold the body fluid that the absorber 30 could not hold. The second region R2 abuts on a sweat-prone region away from the excretory portion. The second region R2 can reliably absorb sweat, which emits less water than excrement. Further, since the density of the highly absorbent polymer in the second region R2 is low, it is possible to reduce the discomfort to the skin due to the unevenness when the highly absorbent polymer 32 expands. As a method for measuring the density, a test piece having the same area is cut out in each of the first region and the second region, the highly absorbent polymer contained in the test piece is taken out, and the weight is measured to measure the density. Can be measured.

The density of the highly absorbent polymer 32 in the outer region RO located outside the width direction W of the absorber 30 is such that the density of the highly absorbent polymer 32 in the outer region RO second region located outside the absorber 30 in the longitudinal direction L. It may be higher than the density of 32. The outer region RO located outside the width direction W with respect to the absorber 30 is easily hit by the base of the wearer's leg. Moisture due to sweat or the like can be absorbed in the area corresponding to the base of the leg, which is relatively easy to sweat. As a method for measuring the density, as in the method for measuring the first region and the second region, a test piece having the same area is cut out in each region, and the highly absorbent polymer contained in the test piece is taken out and weighed. The density can be measured by measuring.

The density of the highly absorbent polymer 32 in the absorber may be constant or different. As shown in FIG. 3, the density of the highly absorbent polymer 32 in the central region RC of the absorber 30 may be higher than the density of the highly absorbent polymer 32 in the surface side region RS of the absorber 30. Due to the high density of the highly absorbent polymer 32 in the central region, the central region RC tends to expand during absorption of body fluids. Therefore, the absorption capacity of body fluid can be secured. Further, the density of the highly absorbent polymer 32 in the surface side region RS is low, and the surface side region RS is unlikely to swell when the body fluid is absorbed. Since it is difficult to form irregularities on the front surface side region RS due to the swelling of the highly absorbent polymer 32, it is difficult for the irregularities of the absorber to be transmitted to the front surface sheet 10 and the back surface sheet 20 located outside in the thickness direction of the absorber. It is possible to reduce the discomfort at the time of mounting due to the unevenness transmitted to the front surface sheet 10 and the back surface sheet 20. As a method for measuring the density, the absorbent article is cut along a cross section along the thickness direction, the cross section is photographed, and the number of highly absorbent polymers contained in the same area in each region is measured. , It can be measured as the density increases as the number increases.

The hydrophilicity of the skin-facing surface side T1 of the absorber 30 may be higher than the hydrophilicity of the non-skin-facing surface side T2 of the absorber 30. Here, the hydrophilicity means the strength with which the absorber attracts water, and the ability to absorb the liquid is stronger on the side with high hydrophilicity than on the side with low hydrophilicity. Since the T1 on the skin-facing surface side of the absorber 30 has a high degree of hydrophilicity, the body fluid excreted in the surface sheet 10 can be quickly drawn in, and the body fluid can be retained by the highly absorbent polymer 32 in the absorber 30. Further, since the hydrophilicity of the non-skin facing surface side T2 of the absorber 30 is low, it becomes difficult for the body fluid in the absorber 30 to reach the back surface sheet 20. Therefore, it becomes difficult for the water content of the body fluid to reach the adhesive portion 50, the decrease in the adhesive force due to the arrival of the water content can be suppressed, and the kinking 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 surface side and a lower layer on the non-skin facing surface side, and the absorbent material is solidified. The hydrophilicity of the binder can be made different depending on the upper layer and the lower layer. As the upper layer binder, a binder containing a hydrophilic agent is used, and as a lower layer binder, a binder containing no hydrophilic agent is used.

The hydrophilicity can be measured by the following method. (1) Place 5 filter papers on top of each other and place them horizontally, and place the test piece to be measured on the filter paper. (2) Mark the test pieces at 2 cm intervals in each of the vertical and horizontal directions. Drop 1 drop of artificial urine (about 0.05 g) into 20 places with a pipette. Drip artificial urine to 20 places in 1 minute and 10 seconds. (3) After leaving 20 places for 30 seconds after the end of dropping, count the places absorbed by the test piece. The more absorption points the test piece has, the higher the hydrophilicity.

In the outer region RO, an adhesive portion 70 coated with an adhesive for adhering the front surface sheet 10 and the back surface sheet 20 may be provided on the skin-facing surface of the back surface sheet 20. As the adhesive, for example, a hot melt type adhesive can be exemplified. The highly absorbent polymer 32 adheres to the back sheet 20 by the adhesive portion on the back sheet side. The body fluid can be held immediately before the body fluid reaches the adhesive portion 50 provided on the back sheet 20, and the adhesive strength of the adhesive portion 50 can be more easily maintained. In addition, since the high-absorbent polymer 32 and the surface sheet 10 are not adhered to each other, a space for the high-absorbent polymer 32 to swell is likely to be formed on the surface sheet 10 side, and the high-absorbent polymer 32 is likely to swell.

As shown in FIG. 1, the absorbent article 1 has a third region R3 located in the center of the longitudinal direction L and a fourth region R4 located outside the longitudinal direction L from 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 longitudinal direction L. The maximum width of the width direction W of the fourth region is longer than the maximum width of the width direction W of the third region.

The pressing portion 60 may be provided so as to straddle the third region R3 and the fourth region R4. The squeezed portion 60 of the fourth region R4 has a wide portion 61 having a length in the width direction W longer than that of the squeezed portion 60 in the third region R3. The wide portion 61 is a shaded area in FIG. The squeezed portion 60 of the third region R3 and the squeezed portion 60 located inside the wide portion 61 in the longitudinal direction L in the fourth region R4 have a linear squeezed portion 65 in which a plurality of arcs are connected and the linear squeezed portion 65. It is composed of a dot-shaped pressing portion 66 arranged inside the pressing portion 65 and along the linear pressing portion 60. That is, two rows of squeezing portions are arranged. On the other hand, in the wide portion 61, point-shaped pressing portions 66 arranged along the linear pressing portion 65 are provided on the outside and the inside of the linear pressing portion 65 in which a plurality of arcs are connected, respectively. ing. That is, three rows of squeezing portions are arranged. The wide portion 61 may be provided at the position of the maximum width PM in the fourth region. The outer edge of the absorbent article in the maximum width of the fourth region is likely to be subjected to an external force such as a leg force. Since the wide portion 61 is provided at the maximum width position, the rigidity of the maximum width position can be increased by the wide portion 61 of the squeezing portion 60, and the absorbent article is twisted or displaced from the underwear due to an external force. Problems can be suppressed.

Further, the wide 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 of overlapping in the width direction W is a state in which the adhesive portion 51 is arranged on the extension line extending in the width direction W of the wide portion 61. The adhesive portion 51 located on the outermost side in the longitudinal direction is susceptible to a force along the longitudinal direction L from the body or underwear. Since the adhesive portion 51 overlaps the wide portion 61 in the width direction W, the rigidity of the adhesive portion 51 located on the outermost side can be increased by the wide portion 61 of the pressing portion 60, and the absorbent article is twisted by an external force. , It is possible to suppress problems such as slipping from underwear.

More preferably, the outermost adhesive portion 51 in the longitudinal direction L may reach the outer edge 1E of the absorbent article and overlap the wide portion 61 in the thickness direction T. The wide portion 61 of the squeezed portion 60 can further increase the rigidity of the adhesive portion 50 located on the outermost side, and it is possible to suppress the trouble that the absorbent article is twisted or displaced from the underwear due to the external force.

Although the present invention has been described in detail using the above-described embodiments, it is clear to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as determined by the description of the scope of claims. Therefore, the description of the present specification is for the purpose of exemplary explanation and does not have any limiting meaning to the present invention.

For example, the absorbent article according to the modified example is provided with an adhesive portion coated with an adhesive for adhering the front surface sheet 10 and the back surface sheet 20 on the non-skin facing surface of the front surface sheet 10 in the outer region RO. May be done. The highly absorbent polymer 32 is adhered to the surface sheet 10 by the adhesive portion on the surface sheet 10 side. Therefore, the body fluid permeated from the surface sheet 10 can be immediately absorbed on the surface sheet 10 side. In addition, since the high-absorbent polymer 32 and the back surface sheet 20 are not adhered to each other, a space in which the high-absorbent polymer 32 swells is likely to be formed on the back surface sheet 20, and the high-absorbent polymer 32 tends to swell. Further, when the non-skin facing surface of the surface sheet 10 is made of an air-through nonwoven fabric, the highly absorbent polymer 32 easily enters the nonwoven fabric which is relatively bulky and has large voids between fibers. Therefore, it becomes easier to create a space for swelling on the back surface sheet 20 side of the highly absorbent polymer 32, and the absorption performance can be improved.

According to the present invention, it is possible to provide an absorbent article capable of suppressing leakage of body fluid by continuously wearing the product at an appropriate position with respect to the body while reducing stuffiness and improving the wearing feeling.

1 Absorbent article 10 Front sheet 20 Back sheet 30 Absorber 31 Pulp 32 Highly absorbent polymer 50 Adhesive part 51 Adhesive part located on the outermost side in the longitudinal direction 60 Pressed part 61 Wide part 70 Adhesive part RO Outer area R1 First area R2 2nd area R3 3rd area R4 4th area RC Central area RS Surface side area P1 Overlapping part P2 Non-placed part P3 Polymer placed part P4 Adhesive placed part PM Maximum width

Claims (12)

In the longitudinal and width directions that are orthogonal to each other,
Liquid permeable surface sheet and
Liquid impermeable back sheet and
An absorber disposed between the front surface sheet and the back surface sheet and having at least pulp and a highly absorbent polymer.
An absorbent article having an adhesive portion arranged on a non-skin facing surface of the back surface sheet.
The hydrophilicity of the absorber on the skin-facing surface side is higher than the hydrophilicity of the absorber on the non-skin-facing surface side.
The absorber has an upper layer located on the skin facing surface side and a lower layer located on the non-skin facing surface side.
An absorbent article in which the hydrophilicity of the binder for solidifying the absorbent material in the upper layer is different from the hydrophilicity of the binder for solidifying the absorbent material in the lower layer . The binder in the upper layer contains a hydrophilic agent and contains a hydrophilic agent.
The absorbent article according to claim 1 , wherein the binder in the lower layer does not contain a hydrophilic agent. The absorbent article according to claim 1 or 2 , wherein the elongation strength of the back surface sheet is higher than the elongation strength of the front surface sheet. The ratio of the 5% elongation strength of the back surface sheet in the width direction to the 5% elongation strength of the back surface sheet is 0.7 or more and 1.3 or less, according to claim 1 or 2 . The absorbent article described. The absorbent article according to claim 3, wherein the back sheet has an elongation strength of 5% in the longitudinal direction and an elongation strength of 5% in the width direction of the back sheet, both of which are 2.0 N / 25 mm or more. The absorbent article has a third region located in the center of the longitudinal direction and a fourth region located outside the third region in the longitudinal direction.
The maximum width of the fourth region in the width direction is longer than the maximum width of the third region in the width direction.
The outer edge of the absorber is located inside the outer edge of the absorbent article.
The outer region between the outer edge of the absorber and the outer edge of the absorbent article is provided with at least a compressed portion obtained by compressing the front surface sheet and the back surface sheet in the thickness direction.
The squeezed portion in the fourth region has a wide portion having a length in the width direction longer than the squeezed portion in the third region.
The absorbent article according to claim 1 or 2 , wherein the wide portion is provided at the position of the maximum width in the fourth region. A plurality of the adhesive portions extend along the width direction and are provided at intervals in the longitudinal direction.
The absorbent article according to claim 6 , wherein the adhesive portion located on the outermost side in the longitudinal direction overlaps with the wide portion in the width direction. The absorbent article according to claim 7 , wherein the adhesive portion located on the outermost side in the longitudinal direction reaches the outer edge of the absorbent article and overlaps with the wide portion in the thickness direction. The outer edge of the absorber is located inside the outer edge of the absorbent article.
The outer region between the outer edge of the absorber and the outer edge of the absorbent article comprises a first region on the absorber side and a second region on the outer edge side of the absorbent article.
The absorbent article according to claim 1 or 2, wherein the density of the highly absorbent polymer in the first region is higher than the density of the highly absorbent polymer in the second region. The absorber has a central region including the center in the thickness direction of the absorber and a surface side region located outside the central region in the thickness direction.
The absorbent article according to claim 9 , wherein the density of the highly absorbent polymer in the central region is higher than the density of the highly absorbent polymer in the surface side region. The outer edge of the absorber is located inside the outer edge of the absorbent article.
In the outer region between the outer edge of the absorber and the outer edge of the absorbent article, the skin-facing surface of the back surface sheet is adhered with an adhesive for adhering the front surface sheet and the back surface sheet. The absorbent article according to claim 1 or 2 , wherein a portion is provided. The outer edge of the absorber is located inside the outer edge of the absorbent article.
In the outer region between the outer edge of the absorber and the outer edge of the absorbent article, the non-skin facing surface of the front surface sheet is coated with an adhesive for adhering the front surface sheet and the back surface sheet. The absorbent article according to claim 1 or 2 , wherein an adhesive portion is provided.

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