Absorbent article

Abstract

To provide an absorbent article which enables a smooth positioning operation in attaching an absorbent pad and obtains sufficient effects by using in combination with the absorbent pad.SOLUTION: A diaper 1 includes a central part missing part 25 in a position where a vertical center line and a lateral center line are overlapped with each other in an absorber. The diaper 1 includes a core wrap sheet 16, an end non-woven fabric 21, and a sheet 23 and an elastic member 22 that constitute three-dimensional gatherings 24, and they are colored. In viewing the diaper 1 from a skin facing surface, a color of a non-skin side part 16b of the core wrap sheet is visible through the central part missing part 25, and colors of the end non-woven fabric 21 and the sheet 23 or the elastic member 22 that constitutes the three-dimensional gatherings 24 can be visually observed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an absorbent article. [Background technology]

[0002] It is common for diapers or diaper covers to have absorbent pads attached to the skin-facing side, and the type of absorbent pad is often changed depending on the level of activity and frequency of pad changes. However, since an absorbent pad can only perform its intended function when it is attached to an absorbent article in a predetermined appropriate position, positioning is important when attaching the absorbent pad to the absorbent article. However, in the positioning operation, the attachment position of the absorbent pad cannot be determined in one operation, and it is not rare that the absorbent pad is attached to and detached from the absorbent article repeatedly.

[0003] Therefore, the present applicant has previously proposed an absorbent article for smooth positioning of an absorbent pad.Patent Document 1 discloses an absorbent article in which at least one type of non-white elastic member is used as an elastic member around the waist of the diaper, and the non-white elastic member serves as a marker when viewed from the skin-facing surface, allowing smooth positioning of the absorbent pad. Furthermore, Patent Document 2 discloses an absorbent article in which a colored sheet is used on the non-skin-facing surface of an absorbent core, and part of the absorbent core has a low basis weight in which the absorbent material is lighter than other parts, and when viewed from the skin-facing surface, the color of the colored sheet is visible in the part with the low basis weight. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-93177 A [Patent Document 2] JP 2021-153752 A Summary of the Invention [Problem to be solved by the invention]

[0005] For example, when a wearer of a pants-type disposable diaper puts on an absorbent pad himself / herself, he / she often inserts both legs into the leg openings of the diaper, pulls the diaper up to about knee height, and then visually checks the inner surface (the surface facing the skin) of the diaper in the mid-pulling state through the waist opening of the diaper while positioning the absorbent pad relative to the inner surface. However, no technology has yet been provided that makes it easy to determine the center position of the diaper in the front-to-back or width direction and enables such positioning operations to be performed smoothly, regardless of the type of absorbent pad.

[0006] Therefore, an object of the present invention is to provide an absorbent article which allows smooth positioning of the absorbent pad when it is attached, and which provides the full benefits of using an absorbent pad in combination without causing inconveniences such as discomfort or leakage during wear due to misalignment of the absorbent pad. [Means for solving the problem]

[0007] The present invention provides an absorbent article which has an absorbent body including an absorbent core made of an absorbent material, and which has a vertical direction extending from the wearer's abdominal side through the crotch region to the back side and a horizontal direction perpendicular to the vertical direction, and which can be used by attaching an absorbent pad to the skin-facing side. It is preferable that the absorbent body has an end nonwoven fabric arranged along the horizontal direction and covering the ends of the absorbent body in the vertical direction, and three-dimensional gathers including a sheet and an elastic member arranged on both sides of the absorbent body in the vertical direction. The absorbent body preferably includes a core wrap sheet that covers the absorbent core. The core wrap sheet preferably has a skin side portion covering the skin facing side of the absorbent core, and a non-skin side portion covering the non-skin facing side. It is preferable that the absorbent body has a central missing portion at a position where a vertical center line that divides the absorbent article in two in the vertical direction overlaps with a horizontal center line that divides the absorbent article in two in the horizontal direction. It is preferable that the non-skin side portion of the core wrap sheet, the end nonwoven fabric, and the sheet or the elastic member forming the three-dimensional gathers are colored. When the absorbent article is viewed from the skin-facing side, it is preferable that the color of the non-skin side portion is visible through the central missing portion, and that the colors of the end nonwoven fabric and the sheet or elastic member forming the three-dimensional gathers are visible. Effect of the Invention

[0008] According to the present invention, an absorbent article is provided in which the positioning operation when attaching an absorbent pad can be performed smoothly, and the effects of using an absorbent pad in combination can be fully obtained without causing inconveniences such as discomfort or leakage during wear due to the absorbent pad being misaligned. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a developed plan view showing a schematic view of the skin-facing surface side of a pants-type disposable diaper, which is a preferred embodiment of the absorbent article of the present invention, in a developed and stretched state. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line II-II in FIG. [Figure 4] FIG. 4 is a developed plan view that shows a schematic view of the skin-facing surface side of an absorbent pad attached to the absorbent article of the present invention in a developed and stretched state. [Diagram 5] FIG. 5 is a cross-sectional view taken along line III-III in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Fig. 1 shows a pants-type disposable diaper 1 which is one embodiment of the absorbent article of the present invention. The diaper 1 has a vertical direction X corresponding to the front-to-back direction of a wearer, and a horizontal direction Y perpendicular thereto. The entire length of the diaper 1 in the vertical direction X can be divided into three equal parts, an abdominal portion A which is disposed in front of the wearer when worn, a back portion B which is disposed behind the wearer when worn, and a crotch portion C which is located between the abdominal portion A and the back portion B. The diaper 1 is a pants-type disposable diaper.

[0011] The diaper 1 comprises a liquid-retentive absorbent 14, a liquid-permeable top sheet 12 located on the skin-facing side of the absorbent 14, and a liquid-impermeable, poorly liquid-permeable, or water-repellent back sheet 13 located on the non-skin-facing side of the absorbent 14 (FIGS. 2 and 3). More specifically, the top sheet 12, the back sheet 13, and the absorbent 14 are integrated to form an absorbent main body 3, which is fixed to the widthwise central region of an exterior body 17. The diaper 1 has an exterior body 17 on the non-skin-facing side of the back sheet 13. The exterior body 17 forms the outer shape of the diaper 1 as shown in FIG. 1, and the periphery of the exterior body 17 forms the outline of the diaper 1 in that state. As shown in FIG. 1, both side edges of the exterior body 17 along the longitudinal direction X of the exterior body 17 are curved in a convex arc shape toward the center in the transverse direction Y, and are narrowed toward the inside in the transverse direction Y.

[0012] In this specification, the "skin-facing side" refers to the side of the absorbent article or its constituent member (e.g., absorbent main body) that faces the wearer's skin when the absorbent article is worn, i.e., the side relatively closer to the wearer's skin, and the "non-skin-facing side" refers to the side of the absorbent article or its constituent member that faces the opposite side to the skin when the absorbent article is worn, i.e., the side relatively farther from the wearer's skin. Note that "when worn" here refers to the normal, proper wearing position, i.e., a state in which the absorbent article is maintained in the correct wearing position, and does not include a state in which the absorbent article is displaced from the wearing position.

[0013] As shown in Figs. 2 and 3, the exterior body 17 includes a laminate of an outer layer sheet 31 and an inner layer sheet 32. When the diaper 1 is worn, the outer layer sheet 31 is located away from the wearer's body and forms the non-skin facing surface of the diaper 1, while the inner layer sheet 32 ​​is located closer to the wearer's body and forms the skin facing surface of the diaper 1. The outer layer sheet 31 and the inner layer sheet 32 ​​are bonded together at predetermined locations with an adhesive. The outer layer sheet 31 has a portion having the same shape and dimensions as the inner layer sheet 32, and further has an abdominal side extension portion 33 that extends outward from an end portion of the abdominal side portion A of the inner layer sheet 32 ​​in the longitudinal direction X when the two sheets 31, 32 are laminated. 3, the abdominal side extending portion 33 of the outer layer sheet 31 is folded back towards the inner layer sheet 32 ​​so as to cover the end portion of the end nonwoven fabric 21 in the longitudinal direction X, and is fixed by an adhesive to another component of the diaper 1 opposite the abdominal side extending portion 33. The dorsal side extending portion 34 is also fixed to another component of the diaper 1 opposite the dorsal side extending portion 34 by a similar procedure to that for the abdominal side extending portion 33.

[0014] The end nonwoven fabric 21 is preferably a nonwoven fabric that covers a part of the end of the absorbent body 14 and fixes it to prevent liquid leakage from the end of the absorbent body 14. The end nonwoven fabric 21 may be formed by folding back one or both of the outer layer sheet 31 and the inner layer sheet 32 ​​constituting the exterior body 17 to the skin-facing side. For example, the ventral extension 33 or the dorsal extension 34 of the outer layer sheet 31 may be folded back to the inner layer sheet 32 ​​side so as to cover the end of the absorbent body 14 in the longitudinal direction X, and the end nonwoven fabric 21 may be formed by coloring the whole or part of the folded back part. The folded back part is preferably fixed to another component of the diaper 1 that faces it by a joining means such as an adhesive.

[0015] In the diaper 1 of this embodiment, as shown in Figs. 1 and 3, the end nonwoven fabric 21 is arranged along the horizontal direction Y so as to cover a part of the end portion of the absorbent body 14 in the vertical direction X. The end nonwoven fabric 21 has a shape that is long in the horizontal direction Y. Specifically, the end nonwoven fabric 21 has a rectangular shape that is long in the horizontal direction Y in a plan view. Furthermore, the length of the end nonwoven fabric 21 in the horizontal direction Y is preferably longer than the length of the absorbent body 14 in the horizontal direction Y, and more preferably has a length that reaches between the side seal portions S, S. Furthermore, the end nonwoven fabric 21 may be fixed to the side seal portion S of the exterior body 17, or may be fixed to a portion other than the side seal portion S.

[0016] As shown in Figs. 1 and 2, three-dimensional gathers 24 are formed on both the left and right sides along the longitudinal direction X of the absorbent body 3, at least in the crotch portion C, which stand up toward the skin side of the wearer when worn. The three-dimensional gathers 24 have a sheet 23 forming the three-dimensional gathers 24 and an elastic member 22 arranged near the free end, and are arranged so as to cover the end of the absorbent body 14 in the lateral direction Y. More specifically, the absorbent body 3 has three-dimensional gathers 24 extending in the longitudinal direction X along both side edges. The three-dimensional gathers 24 stand up so as to form a free end on the skin side of the wearer, with the elastic member 22 arranged in a stretched state along the longitudinal direction X at the free end. The elastic member 22 extends over at least the entire length of the crotch portion C in the longitudinal direction X, and in this embodiment, it also extends to the portions of the abdominal portion A and the back portion B near the crotch portion C. Furthermore, in the diaper 1, leg elastic members 35 are usually arranged in a stretched state in the crotch portion C at the portions around the legs, and when the diaper 1 is worn, leg gathers are formed in the crotch portion C to improve the fit around the legs of the wearer by contracting the leg elastic members 35. In the schematic diagram shown in Fig. 1, the elastic members 22 and the leg gathers are omitted.

[0017] The absorbent body 14 has an absorbent core 15, which is a main liquid absorbing part and has the function of absorbing and retaining body fluids such as urine, and a core wrap sheet 16 that covers the absorbent core 15 (see FIG. 2). The absorbent core 15 is made of an absorbent material. In this embodiment, the absorbent core 15 is composed of a fiber material and a water-absorbing polymer as the absorbent material. The absorbent core 15 of this embodiment has a shape that is almost symmetrical with respect to a vertical center line CLx that extends in the vertical direction X by dividing the length of the absorbent body 14 in the horizontal direction Y in half. Moreover, the absorbent core 15 of this embodiment has a shape that is almost symmetrical with respect to a horizontal center line CLy that extends in the horizontal direction Y by dividing the length of the absorbent body 14 in the vertical direction X in half.

[0018] The absorbent core 15 is covered over its entire area with the core wrap sheet 16, and has a skin side portion 16a covering the skin-facing side of the absorbent core 15 and a non-skin side portion 16b covering the non-skin-facing side. The non-skin side portion 16b is colored. The skin side portion 16a may also be colored. The core wrap sheet 16 and the absorbent core 15 are joined to each other by a known joining means such as an adhesive. The absorbent core 15 may be covered with one core wrap sheet or multiple core wrap sheets. In FIG. 1, the core wrap sheet 16 that covers the absorbent core 15 is omitted.

[0019] Furthermore, the absorbent core 15 has a central missing portion 25 in its center where no absorbent material is present (see Figs. 1 and 2). The central missing portion 25 is a portion where no absorbent material is present, or a portion where the basis weight of the absorbent material is significantly less than other portions. In other words, the central missing portion 25 may be a through-hole where no absorbent material is present, or a portion where absorbent material is present but whose basis weight is significantly less than other portions. Whether or not a portion has a significantly lower basis weight than other portions can be determined by whether or not the color of the non-skin side portion 16b of the core wrap sheet is visible through the missing portion when viewed from the skin side of the absorbent body 14. In addition, for example, when comparing the mass of the absorbent material in a central region having a diameter of 10 mm whose center point is the center of the missing portion with the mass of the absorbent material in an adjacent region having a diameter of 10 mm whose center point is a point 20 mm away from the central point in the vertical direction X or horizontal direction Y, it can be determined by whether or not the mass of the absorbent material in the central region is 1 / 5 or less, preferably 1 / 10, of the mass of the absorbent material in the adjacent region.

[0020] The missing portion is preferably made of an absorbent material having a basis weight of 3 g / m 2 Less than 1 g / m, more preferably 2 The basis weight of the absorbent material is the basis weight of either a fiber material such as pulp or a superabsorbent polymer when the absorbent core 15 contains only one of them, and is the sum of the basis weights of the fiber material and the superabsorbent polymer when the absorbent core 15 contains both a fiber material such as pulp and a superabsorbent polymer. It is preferable that the absorbency of the missing portion is low enough that the color of the non-skin side portion 16b of the core wrap sheet can be visually recognized. The absorbent core 15 of this embodiment has a central missing portion 25 at a position where the vertical centerline CLx and the horizontal centerline CLy overlap. Specifically, the central missing portion 25 overlaps with the vertical centerline CLx so that the vertical centerline CLx halves the length of the central missing portion 25 in the horizontal direction Y, and the horizontal centerline CLy overlaps with the horizontal centerline CLy so that the horizontal centerline CLy halves the length of the central missing portion 25 in the vertical direction X.

[0021] In the diaper 1 of this embodiment, the non-skin side portion 16b of the core wrap sheet, the end nonwoven fabric 21, and the sheet 23 or elastic member 22 forming the three-dimensional gathers 24 are colored. These colors may be the same color or different colors. When the sheet 23 forming the three-dimensional gathers 24 is colored, it is preferable that at least the visible area of ​​the sheet 23 forming the three-dimensional gathers 24 is colored when the diaper 1 is viewed from the skin-facing surface. These colorings are achieved by including fibers with coloring material kneaded into them, or by printing. Coloring means presenting a color other than white. The colors of the non-skin side portion 16b of the core wrap sheet, the end nonwoven fabric 21, and the sheet 23 forming the three-dimensional gathers 24 or the elastic member 22 may be, for example, but are not limited to, black, indigo blue, red, yellow, green, pink, purple, brown, yellow-green, light blue, blue, etc. These colors may be painted alone or in different colors. If the top sheet 12 is colored, it is preferable that the color is different from the color of the non-skin side portion 16b of the core wrap sheet.

[0022] From the viewpoint of easily grasping the positions of the pair of end nonwoven fabrics 21 and the space between the pair of end nonwoven fabrics 21 and facilitating the alignment in the longitudinal direction X of the absorbent pad, or from the viewpoint of easily grasping the positions of the pair of three-dimensional gathers 24 and the space between the pair of three-dimensional gathers 24 and facilitating the alignment in the lateral direction Y of the absorbent pad, it is preferable that the colors of the pair of end nonwoven fabrics are the same, and it is preferable that the colors of the sheets 23 of the pair of three-dimensional gathers 24 are the same or the colors of the elastic members 22 are the same. For example, it is preferable that the colors of the end nonwoven fabrics 21 arranged on the ventral side A side and the dorsal side B side are the same, and it is preferable that the colors of the sheets 23 forming the three-dimensional gathers 24 covering one end and the other end of the lateral direction Y of the absorbent body 14 are the same, or that the colors of the elastic members 22 arranged on one end and the other end of the lateral direction Y of the absorbent body 14 are the same. As examples of coloring, the non-skin side portion 16b of the core wrap sheet is black, the end nonwoven fabrics 21 arranged on the ventral side A side and the dorsal side B side are red, the sheets 23 forming the three-dimensional gathers 24 that cover one end and the other end of the lateral direction Y of the absorbent body 14 are blue, and the elastic members 22 arranged at one end and the other end of the lateral direction Y of the absorbent body 14 are yellow.

[0023] The diaper 1 of this embodiment is preferably used with another absorbent article (for example, an incontinence pad) disposed on the skin-facing side thereof, that is, the diaper 1 is used as an outer layer, and the other absorbent pad is used as an inner layer. When the diaper 1 of this embodiment is viewed from the skin-facing surface, the colors of the end nonwoven fabric 21 and the sheet 23 or elastic member 22 forming the three-dimensional gathers 24 are visible. Furthermore, the color of the non-skin side portion 16b of the core wrap sheet is visible in the area where the central missing portion 25 is located. For example, as shown in FIG. 1, when the diaper 1 is viewed in plan, the color of the end nonwoven fabric 21 can be seen. Since the end nonwoven fabric 21 is located at the end region in the longitudinal direction X of the diaper 1, it can be used as a marker for positioning the absorbent article in the longitudinal direction X. Furthermore, since the color of the sheet 23 or elastic member 22 forming the three-dimensional gathers 24 is visible, it can be used as a marker for positioning the absorbent article in the lateral direction Y. Furthermore, the color of the non-skin side portion 16b of the core wrap sheet can be seen through the top sheet 12 in the area where the central missing portion 25 is located. Since the central missing portion 25 is located at the center of the absorbent core 15 in the longitudinal direction X and the transverse direction Y, it can be used as a mark for positioning at the center. Since these marks function as marks for positioning, the positioning of the absorbent pad can be smoothly performed, and the effect of using the absorbent pad in combination can be fully obtained without causing inconvenience such as discomfort or leakage during wearing due to the positional deviation of the absorbent pad. That is, when the wearer of the diaper 1 puts on the absorbent pad by himself, he usually inserts both legs into the diaper 1 and pulls the diaper 1 up to about knee height, and while visually checking the inside of the diaper 1 in this state, i.e., the skin-facing side, through the waist opening in the state where both legs are spread, the absorbent pad is inserted into the diaper 1 and a positioning operation is performed. However, since the wearer can visually check the above marks through the waist opening during the positioning operation, the positioning of the absorbent pad can be smoothly performed by relying on the above marks.

[0024] In this embodiment, it is not important whether the colored members of the diaper 1, i.e., the non-skin side portion 16b of the core wrap sheet, the end nonwoven fabric 21, and the sheet 23 or elastic member 22 forming the three-dimensional gathers 24, are visible from the non-skin facing side of the diaper 1. As described above, the colored members are used as markers when attaching an absorbent pad to the inner side of the diaper 1 while visually checking the inner side of the diaper 1, and even if the colored members cannot be visually confirmed from the outer side of the diaper 1, there is no problem in attaching the absorbent pad.

[0025] In this embodiment, the size of the central missing portion 25 is preferably within the following range, from the viewpoint of further improving the visibility of the color of the non-skin side portion 16b of the core wrap sheet. The area of ​​the central cutout 25 in plan view is preferably 100 mm 2 More than 200mm, preferably 2 More preferably, 240 mm 2 In order to ensure a required absorption capacity even when the absorbent article of the present invention is used alone as a pants diaper, the area of ​​the central cutout 25 in a plan view is preferably 1600 mm 2 Less than or equal to 1200mm, preferably 2 Less than 900mm, more preferably 2 The following is the result. The length L1 (see FIG. 1) of the central missing portion 25 in the longitudinal direction X is preferably 20 mm or more, more preferably 30 mm or more, and is preferably 80 mm or less, more preferably 60 mm or less, and is preferably 20 mm or more and 80 mm or less, more preferably 30 mm or more and 60 mm or less. The length L2 (see Figure 1) of the central missing portion 25 in the horizontal direction Y is preferably 5 mm or more, more preferably 8 mm or more, and preferably 20 mm or less, more preferably 15 mm or less, and preferably 5 mm or more and 20 mm or less, more preferably 8 mm or more and 15 mm or less. Furthermore, the length L1 of the central missing portion 25 in the longitudinal direction X is preferably 3% or more, more preferably 5% or more, and preferably 15% or less, more preferably 10% or less, of the total length A1 (see Figure 1) in the longitudinal direction X in the area where the missing portion of the absorbent core 15 exists, and is preferably 3% or more and 15% or less, more preferably 5% or more and 10% or less. The length L2 of the central missing portion 25 in the horizontal direction Y is preferably 2% or more, more preferably 4% or more, and preferably 12% or less, more preferably 8% or less, relative to the total length A2 (see Figure 1) in the horizontal direction Y in the area where the missing portion of the absorbent core 15 exists, and is preferably 2% or more and 12% or less, more preferably 4% or more and 8% or less.

[0026] Considering the improvement of the operability of the positioning operation when the diaper wearer puts on the absorbent pad by himself as described above, it is preferable that the skin side portion 16a is colored in addition to the non-skin side portion 16b of the core wrap sheet. In this case, the color of the non-skin side portion 16b and the color of the skin side portion 16a are combined to improve the visibility when the diaper 1 is viewed from the skin-facing surface. In this way, the central cutout portion 25 functions as a marker for the positioning operation in the center of the diaper 1, and the positioning operation of the absorbent pad can be performed more smoothly. The color of the non-skin side portion 16b and the color of the skin side portion 16a may be the same or different as long as it can improve visibility. One example of coloring is that the non-skin side portion 16b and the skin side portion 16a are each colored pale red. In this case, the color of the non-skin side portion 16b and the color of the skin side portion 16a are combined to appear as a deep red color, improving visibility.

[0027] From the viewpoint of further achieving the above-mentioned effects, it is preferable that the absorbent body 14 has three colored core wrap sheets 16 at positions overlapping the central missing portion 25 in a plan view. For example, the absorbent body 14 may have three core wrap sheets 16, two skin side portions 16a of the core wrap sheets, and one non-skin side portion 16b of the core wrap sheet. Alternatively, the absorbent body 14 may have one core wrap sheet 16, and the non-skin side portion 16b of the core wrap sheet may have an extension portion extending outward in the lateral direction Y from the non-skin facing side of the absorbent core 15, and the extension portion may be rolled up to the skin facing side to cover the skin facing side of the absorbent core 15, and the ends of the core wrap sheets 16 may overlap each other at the central missing portion 25. By doing this, the color of the core wrap sheet 16 can be made to stand out even more in the central missing portion 25, and the central missing portion 25 functions as a marker for positioning operations in the center of the absorbent article, making it easier to position the absorbent pad.

[0028] In the present invention, the skin side and non-skin side of the core wrap sheet 16 may each be a portion of a single continuous core wrap sheet 16. The skin side and non-skin side of the core wrap sheet 16 may also be formed by a plurality of core wrap sheets 16, for example, the skin side of the core wrap sheet may be formed from a core wrap sheet arranged on the skin-facing side of the absorbent core, and the non-skin side of the core wrap sheet may be formed from a core wrap sheet arranged on the non-skin-facing side of the absorbent core.

[0029] From the viewpoint of improving the ease of positioning when the diaper wearer puts on the absorbent pad by himself, it is preferable that the absorbent core 15 has a pair of side missing portions 26a, 26b extending along the longitudinal direction X in both end regions in the lateral direction Y, as shown in Figures 1 and 2. The side missing portions 26a, 26b are portions where no absorbent material is present, or portions where the basis weight of the absorbent material is significantly less than other portions. Whether or not the side missing portions 26a, 26b are portions where the basis weight is significantly less than other portions is determined in the same manner as for the central missing portion 25. In this case, the side missing portions 26a, 26b are portions in which absorbent material such as fibrous material is not present or the basis weight of the absorbent material is significantly less than other portions in a pair of side missing portions 26a, 26b along the longitudinal direction X, so that the color of the non-skin side portion 16b of the core wrap sheet stands out more and functions as a marker for positioning operations in the transverse direction Y of the absorbent article, making it easier to position the absorbent pad.

[0030] From the viewpoint of improving the visibility of the color of the non-skin side portion 16b of the core wrap sheet and ensuring absorbent material, it is preferable that the side missing portions 26a, 26b are within the following range. The area of ​​each of the side cutouts 26a and 26b in plan view is preferably 1500 mm 2 More preferably, 3000 mm 2 More preferably, 3500 mm 2 More than 12500mm, preferably 12500mm 2 Less than or equal to 10,000 mm, more preferably 2 Less than 9000mm, more preferably 2 The following is the result. The length L3 (see FIG. 1) of the side missing portions 26a, 26b in the longitudinal direction X is preferably 300 mm or more, more preferably 350 mm or more, and is preferably 500 mm or less, more preferably 450 mm or less, and is preferably 300 mm or more and 500 mm or less, more preferably 350 mm or more and 450 mm or less. The length L4 (see FIG. 1) of the side missing portions 26a, 26b in the lateral direction Y is preferably 5 mm or more, more preferably 10 mm or more, and is preferably 25 mm or less, more preferably 20 mm or less, and is preferably 5 mm or more and 25 mm or less, more preferably 10 mm or more and 20 mm or less.

[0031] Furthermore, from the viewpoint of improving the operability of the positioning operation when the diaper wearer puts on the absorbent pad by himself, it is preferable that the absorbent core 15 has a pair of end missing parts 27a, 27b at the longitudinal ends as shown in Fig. 1. The end missing parts 27a, 27b are parts where no absorbent material is present or parts where the basis weight of the absorbent material is significantly lower than other parts. Whether or not the part has a basis weight significantly lower than other parts is determined in the same manner as the central missing part 25. However, the adjacent areas are set on both sides of the central area in the lateral direction Y (on the left and right sides in Fig. 1). The end missing parts 27a, 27b have a substantially triangular shape and are substantially symmetrical with respect to the longitudinal center line CLx. In the end missing parts 27a, 27b located at the ends in the longitudinal direction X, absorbent material such as fiber material is not present or the basis weight of the absorbent material is significantly less than other parts, so that the color of the non-skin side part 16b of the core wrap sheet stands out more and functions as a marker for positioning the absorbent article in the longitudinal direction X, making the positioning operation of the absorbent pad smoother. From the above viewpoint, it is preferable that some areas of the end missing parts 27a, 27b do not overlap with the end nonwoven fabric 21.

[0032] In the end missing portions 27a and 27b, from the viewpoint of improving the visibility of the color of the non-skin side portion 16b of the core wrap sheet and securing the absorbent material, the area of ​​the end missing portions 27a and 27b in a plan view is preferably 500 mm 2 More than 750mm, preferably 750mm 2 More preferably, 1000 mm 2 More than 3100 mm, preferably 2 Less than or equal to 2500 mm, preferably less than 2500 mm 2 Less than 2200mm, more preferably 2 The area of ​​the end missing portions 27a and 27b that do not overlap with the end nonwoven fabric 21 is preferably 1000 mm 2 More preferably, 1500 mm 2 More preferably, 2000 mm 2 That's all. The length L5 (see FIG. 1) of the end missing portions 27a, 27b in the longitudinal direction X is preferably 20 mm or more, more preferably 30 mm or more, and is preferably 65 mm or less, more preferably 55 mm or less, and is preferably 20 mm or more and 65 mm or less, more preferably 30 mm or more and 55 mm or less. The length L6 (see FIG. 1) of the end missing portions 27a, 27b in the horizontal direction Y is preferably 50 mm or more, more preferably 60 mm or more, and is preferably 95 mm or less, more preferably 85 mm or less, and is preferably 50 mm or more and 95 mm or less, more preferably 60 mm or more and 85 mm or less.

[0033] With regard to the central missing portion 25, the side missing portions 26a, 26b, and the end missing portions 27a, 27b, as described above, the missing portions are portions where no absorbent material is present, or portions where the basis weight of the absorbent material is significantly less than other portions. In other words, the missing portions may be through holes where no absorbent material is present, or portions where absorbent material is present but its basis weight is significantly lower than other portions.

[0034] In order to further improve the visibility of the color of the non-skin side portion 16b of the core wrap sheet, it is preferable that the thicknesses of the central missing portion 25, the side missing portions 26a, 26b and the end missing portions 27a, 27b are within the following ranges. The thickness D2 of the central missing portion 25, the side missing portions 26a, 26b, and the end missing portions 27a, 27b is preferably 0% or more, more preferably 3% or more, and preferably 10% or less, more preferably 8% or less, and preferably 0% or more and 10% or less, more preferably 3% or more and 8% or less, relative to the thickness D1 of the absorbent core 15. The thickness D2 of the central missing portion 25, the side missing portions 26a, 26b and the end missing portions 27a, 27b is preferably 0 mm or more, more preferably 0.5 mm or more, and preferably 6 mm or less, more preferably 5 mm or less, and preferably 0 mm or more and 6 mm or less, more preferably 0.5 mm or more and 5 mm or less. The thickness D1 of the absorbent core 15 is the thickness of the absorbent core 15 other than the central missing portion 25, the side missing portions 26a, 26b, and the end missing portions 27a, 27b. In this specification, the thickness of the absorbent core 15 is measured by the following method.

[0035] [Method of measuring the thickness of absorbent core] The thickness D1 of the absorbent core 15 and the thickness D2 of the central missing portion 25, the side missing portions 26a, 26b, and the end missing portions 27a, 27b were measured with a compressive strength of 5 cN / cm 2 The measurement is performed with a load of 5 cN / cm applied. Specifically, the measurement is performed using a thickness gauge (PEACOCK DIAL GAUGE 207F-PL manufactured by Ozaki Seisakusho Co., Ltd.). At this time, a load of 5 cN / cm is applied between the tip of the thickness gauge and the object to be measured. 2 A plate having a circular or square shape in plan view and a size adjusted so that the thickness is measured.

[0036] From the same viewpoint as above, the basis weight of the central missing portion 25, the side missing portions 26a, 26b and the end missing portions 27a, 27b is preferably within the following ranges. The basis weight of the central missing portion 25, the side missing portions 26a, 26b and the end missing portions 27a, 27b is preferably 0% or more, more preferably 3% or more, and preferably 10% or less, more preferably 8% or less, and preferably 0% or more and 10% or less, more preferably 3% or more and 8% or less, relative to the basis weight of the portions of the absorbent core 15 other than the central missing portion 25, the side missing portions 26a, 26b and the end missing portions 27a, 27b. The basis weight of the central missing portion 25, the side missing portions 26a, 26b, and the end missing portions 27a, 27b is preferably 0 g / m 2 More preferably, 3 g / m 2 More preferably, it is 10 g / m 2 Less than 8g / m, more preferably 2 or less, and preferably 0 g / m 2 More than 10g / m 2 Less than 3g / m, more preferably 2More than 8g / m 2 The following is the result.

[0037] From the viewpoint of further improving the visibility of the color of the non-skin side portion 16b of the core wrap sheet, the basis weight of the absorbent core 15 in the portions other than the central missing portion 25, the side missing portions 26a, 26b, and the end missing portions 27a, 27b is preferably 100 g / m 2 More preferably, 150 g / m 2 More preferably, it is 1000 g / m 2 and preferably 100 g / m 2 More than 1000g / m 2 Less than 150 g / m 2 More than 1000g / m 2 Setting the basis weight of the absorbent core 15 in the above-mentioned ranges for the portions other than the central missing portion 25, the side missing portions 26a, 26b, and the end missing portions 27a, 27b is preferable in that it improves the visibility of the color, particularly when the non-skin side portion 16b of the core wrap sheet is colored.

[0038] From the viewpoint of further increasing the visibility of the colors of the non-skin side portion 16b of the core wrap sheet, the end nonwoven fabric 21, and the sheet 23 forming the three-dimensional gathers 24 from the skin-facing side of the diaper 1, it is preferable that the top sheet 12, the back sheet 13, and the inner layer sheet 32 ​​are white and have no design or pattern. In this case, the non-skin side portion 16b of the core wrap sheet, the end nonwoven fabric 21, and the sheet 23 forming the three-dimensional gathers 24 become more noticeable, making them more likely to function as markers.

[0039] 4 shows a schematic diagram of an absorbent pad 100, which is an example of another absorbent article arranged on the skin-facing side of the diaper 1. The absorbent pad 100 has a shape that is long in the longitudinal direction X1. Specifically, the absorbent pad 100 has a rectangular shape that is long in the longitudinal direction X1 in a plan view. The absorbent pad 100 has a shape that is approximately symmetrical with respect to a longitudinal center line CLx1 that halves the length in the lateral direction Y1 and extends in the longitudinal direction X1. The absorbent pad 100 also has a shape that is approximately symmetrical with respect to a lateral center line CLy1 that halves the length in the longitudinal direction X1 and extends in the lateral direction Y1. The absorbent pad in the figure is in an unfolded state, with the elastic members in each part stretched to the designed dimensions (the same dimensions as when spread out flat with all the influence of the elastic members eliminated).

[0040] 4 and 5, the absorbent body 44 of the absorbent pad 100 comprises a liquid-permeable top sheet 41 forming the skin-facing side, a liquid-impermeable or poorly liquid-permeable or water-repellent back sheet 42 forming the non-skin-facing side, and a liquid-retentive absorbent core 43 and a core wrap sheet 47 interposed between the two sheets 41, 42, which are integrated together by a known joining means such as an adhesive. The absorbent core 43 has a rectangular shape in a plan view and forms the outer shape of the absorbent body 44.

[0041] 4 and 5, a pair of three-dimensional gathers 45, 45 made of a liquid-resistant or water-repellent and breathable sheet material is provided on both left and right sides along the longitudinal direction X1 of the skin-facing surface of the absorbent pad 100. One or more thread-like elastic members 46 are arranged in a stretched state near the free end of the three-dimensional gathers 45. The three-dimensional gathers 45 stand up at least in the crotch area as the stretched elastic members 46 contract when the diaper 1 is worn, thereby preventing excreted liquids such as urine from flowing outward in the lateral direction Y.

[0042] The diaper 1 of this embodiment is composed of an absorbent body 14, an end nonwoven fabric 21, and a three-dimensional gather 24 including a sheet 23 forming the three-dimensional gather 24. The absorbent body is also composed of an absorbent core 15 made of an absorbent material, and a core wrap sheet 16. The core wrap sheet 16, the end nonwoven fabric 21, and the sheet 23 or elastic member 22 forming the three-dimensional gather 24 are colored as described above. The absorbent core 15 has a central missing portion 25 where the color of the non-skin side portion 16b of the core wrap sheet is visible when the diaper 1 is viewed from the skin-facing surface.

[0043] When the diaper 1 is used as an outer and the absorbent pad 100 is used as an inner, the central missing portion 25 of the diaper 1, the end nonwoven fabric 21, and the sheet 23 or the elastic member 22 forming the three-dimensional gathers 24 can be used as markers to easily align the vertical center line CLx along the vertical direction X that divides the diaper 1 into two equal parts in the horizontal direction Y with the vertical center line CLx1 of the absorbent pad 100. Also, the horizontal center line CLy along the horizontal direction Y that divides the diaper 1 into two equal parts in the vertical direction X with the horizontal center line CLy1 of the absorbent pad 100 can be easily aligned. Furthermore, the position of the end of the diaper 1 in the vertical direction X1 and the position of the end of the absorbent pad 100 in the vertical direction X1 can be easily aligned, and the position of the diaper 1 in the horizontal direction Y and the position of the absorbent pad 100 in the horizontal direction Y1 can be easily aligned. That is, the absorbent pad 100 can be easily attached to the diaper 1 at an appropriate position.

[0044] The materials for forming each part of the diaper of the above-mentioned embodiment can be any of various materials conventionally used in the technical field. For example, the top sheet 12 and the back sheet 13 can be any of various materials conventionally used in the technical field. The top sheet 12 can be a liquid-permeable sheet such as various nonwoven fabrics and perforated films that have been subjected to hydrophilic treatment. Examples of various nonwoven fabrics include air-through nonwoven fabrics, point-bonded nonwoven fabrics, spunbonded nonwoven fabrics, spunlace nonwoven fabrics, and three-dimensionally shaped nonwoven fabrics. Examples of fibers constituting the nonwoven fabric include monofilaments of polypropylene and composite fibers of polypropylene and polyethylene. The back sheet 13 may also be a material that is difficult to permeate liquids. The term "difficult to permeate liquids" refers to a property that does not allow liquids such as water to pass through but allows gases such as water vapor to pass through. Examples of sheets that are difficult to permeate liquids include resin films that do not have moisture permeability, resin films that have fine holes and are moisture permeable, nonwoven fabrics such as water-repellent nonwoven fabrics, and laminates of these with other sheets. Examples of moisture-permeable resin films include porous films in which fine powder of a filler such as calcium carbonate is dispersed, the films being made of synthetic resin such as polyethylene, and the like, are stretched to provide fine holes. The back sheet 13 may also be a laminate of a sheet that is poorly permeable to liquids and a sheet that is permeable to liquids (such as a nonwoven fabric).

[0045] As the material for forming the absorbent core 15, various materials conventionally used in the art can be used without any particular limitation, for example, natural cellulose fibers such as wood pulp, fibrous materials such as hydrophilic synthetic fibers, water-absorbent polymers of a specific shape such as particulate or fibrous, etc., and these can be used alone or in combination of two or more. In addition, antibacterial agents, etc. may be contained.

[0046] As the core wrap sheet 16, a liquid-permeable sheet can be used, for example, paper such as tissue paper, nonwoven fabric made of hydrophilic fibers such as cotton or rayon, nonwoven fabric made of synthetic resin fibers that have been subjected to a hydrophilic treatment, a mesh sheet, a perforated film, etc. The core wrap sheet 16 is preferably a hydrophilic sheet member.

[0047] As the sheet 23 forming the three-dimensional gathers 24, various types of sheets conventionally used in the art can be used without any particular limitation, such as water-repellent nonwoven fabrics (spunbond-meltblown-spunbond nonwoven fabrics (so-called SMS, SMMS, SSMMS nonwoven fabrics), spunbond-meltblown nonwoven fabrics (SM nonwoven fabrics), spunbond nonwoven fabrics), sheets made of resin films, laminates of nonwoven fabrics and resin films, etc. Examples of the elastic member 22 constituting the three-dimensional gathers 24 include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. The elastic member 22 may be in the form of a thread, a belt, or a film.

[0048] As the outer layer sheet 31 and the inner layer sheet 32, various materials conventionally used as outer casings in this type of absorbent article can be used without any particular restrictions, and for example, nonwoven fabrics manufactured by various manufacturing methods such as spunbond nonwoven fabric, air-through nonwoven fabric, needle punched nonwoven fabric, etc. can be used.

[0049] The leg elastic members 35 and the waist elastic member 36 are both sandwiched and fixed by a joining means such as an adhesive between the outer sheet 31 and the inner sheet 32 ​​that constitute the exterior body 17. As the leg elastic members 35 and the waist elastic member 36, elastic materials such as natural rubber, polyurethane resin, urethane foam resin, and hot melt elastic materials formed into threads (rubber threads) or bands (flat rubber) are preferably used.

[0050] Although the present invention has been described above based on its preferred embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the outer layer sheet 31 and the inner layer sheet 32 ​​constituting the exterior body 17 are each composed of one continuous sheet, but may be composed of a combination of multiple sheets. Also, the exterior body 17 may be divided into an exterior body ventral region located in the ventral part A and an exterior body posterior region located in the posterior part B, and the absorbent body 14 may be fixed across the exterior body ventral region and the exterior body posterior region. Furthermore, the outer layer sheet 31 may not have the ventral extension part 33. Furthermore, the absorbent article of the present invention is not limited to pants-type disposable diapers, but broadly includes articles used to absorb liquid discharged from the human body, including open-type disposable diapers, sanitary shorts, etc. [Explanation of symbols]

[0051] 1. Diapers 3 Absorbent body 12 Surface sheet 13 Back sheet 14 Absorber 15 Absorbent Core 16 Core wrap sheet 16a, 16b Skin side, non-skin side 17 Exterior body 21 End nonwoven fabric 22 Elastic member 23 Sheet for forming three-dimensional gathers 24 Three-dimensional gathers 25 Central missing part 26a, 26b Side missing parts 27a, 27b Missing end 31 Outer layer sheet 32 Inner sheet 33 Ventral extension 34 Dorsal extension 35 Leg elastic member 36 Waist elastic member CLx Vertical center line CLy horizontal center line

Claims

1. An absorbent article that includes an absorbent body including an absorbent core made of an absorbent material, and has a longitudinal direction extending from a wearer's abdominal side through a crotch region to a dorsal side and a transverse direction perpendicular to the longitudinal direction, and that can be used by attaching an absorbent pad to a skin-facing surface side, an end nonwoven fabric arranged along the transverse direction and covering the end portions of the absorbent body in the longitudinal direction; and three-dimensional gathers arranged on both sides of the absorbent body in the longitudinal direction and including a sheet and an elastic member; The absorbent body includes a core wrap sheet that covers the absorbent core, The core wrap sheet has a skin-side portion that covers the skin-facing side of the absorbent core and a non-skin-side portion that covers the non-skin-facing side, the absorbent body has a central missing portion at a position where a vertical center line that divides the absorbent article into two equal parts in the vertical direction and a horizontal center line that divides the absorbent article into two equal parts in the horizontal direction overlap, The non-skin side portion of the core wrap sheet, the end nonwoven fabric, and the sheet or the elastic member forming the three-dimensional gathers are colored, When the absorbent article is viewed from the skin-facing side, the color of the non-skin side portion is visible through the central missing portion, and the colors of the end nonwoven fabric and the sheet or elastic member forming the three-dimensional gathers are visible.

2. The absorbent article of claim 1 , wherein the skin side portion is colored in addition to the non-skin side portion.

3. The absorbent article according to claim 1 or 2, wherein the absorbent body has three colored core wrap sheets at positions that overlap the central missing portion in a plan view.

4. The absorbent article according to claim 1 or 2, wherein the absorbent core has a pair of side missing portions extending along the longitudinal direction in both end regions in the lateral direction.

5. The absorbent article according to claim 1 or 2, wherein the absorbent core has end-missing portions at the longitudinal ends.

6. the sheet forming the three-dimensional gathers is colored, 3. The absorbent article according to claim 1, wherein the top sheet, the back sheet and the inner sheet are white and have no pattern or design.

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