Disposable diapers

Abstract

To provide a disposable diaper that is easy to be arranged at an appropriate position with respect to the crotch part of a wearer in a supine position when a care taker or the like attaches the disposable diaper to around the waist of the wearer.SOLUTION: There is provided a disposable diaper 1 in which a fixation tape 16 is attached to both sides of a rear part of a diaper body 2 in a width direction. In the diaper body 2, an absorbent core 5 is provided between a top sheet 3 and a back sheet 4. In the absorbent core 5, a front part and a rear part are formed to be wider than an intermediate part. The absorbent core 5 is provided with a mark part 6 formed by an opening part or a recess part. In a planar state of the diaper 1, a rear side end of the mark part 6 is located in the further front side than the fixation tape 16, and a front side end of the mark part 6 is located in the further rear side than the intermediate part of the absorbent core 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tape-type disposable diaper. [Background technology]

[0002] BACKGROUND ART Tape-type disposable diapers having an absorbent core with openings and recesses formed therein have been known (for example, Patent Documents 1 to 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-185240 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-041311 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-293034 [Patent Document 4] Japanese Utility Model Application Publication No. 06-021622 Summary of the Invention [Problem to be solved by the invention]

[0004] A tape-type disposable diaper is configured with fastening tapes attached to both widthwise sides of the rear portion of the diaper body. When worn, the fastening tapes can be fastened to target tapes attached to the front abdominal portion of the diaper body to place the diaper around the wearer's waist. Tape-type disposable diapers may be placed around the wearer's waist by a caregiver while the wearer is lying down. In this case, the caregiver places the disposable diaper flat under the buttocks of the supine-lying wearer, then places the front abdominal portion of the disposable diaper against the wearer's abdomen through the wearer's crotch, and fastens the fastening tapes to the target tapes attached to the front abdominal portion. When a caregiver places a tape-type disposable diaper on a wearer in this manner, it is desirable that the caregiver be able to easily position the disposable diaper appropriately relative to the wearer's crotch when placing it under the wearer's buttocks.

[0005] The present invention has been made in consideration of the above circumstances, and its object is to provide a disposable diaper that allows a caregiver or the like to easily position the disposable diaper in an appropriate position relative to the crotch area of ​​a wearer in a supine position when putting the disposable diaper around the waist of the wearer. [Means for solving the problem]

[0006] The present invention includes the following disposable diaper. [1] A disposable diaper having a front-to-rear direction and a width direction, and fastening tapes attached to both sides of the width direction of the rear part of the diaper body, The diaper body has an absorbent core disposed between a top sheet and a back sheet, the absorbent core has a front section, a rear section and an intermediate section therebetween, the front section and the rear section being wider than the intermediate section; The absorbent core is provided with a marking portion formed from an opening or a recess, A disposable diaper characterized in that, when the diaper is in a flat state, the rear end of the marker portion is located forward of the fastening tape, and the front end of the marker portion is located rearward of the middle portion of the absorbent core. [2] The marking portions are provided approximately symmetrically with respect to the center line in the width direction of the absorbent core, The disposable diaper according to [1], wherein the length from one end to the other end of the marker portion in the width direction is 50% or less of the length of the rear portion of the absorbent core in the width direction. [3] A disposable diaper as described in [1] or [2], wherein the length from one end to the other end in the width direction at the front end of the marker portion is longer than the length from one end to the other end in the width direction at the rear end of the marker portion. [4] The disposable diaper according to any one of [1] to [3], wherein the opening or recess of the marking portion is formed as a groove. [5] The disposable diaper described in [4], wherein the groove portion includes a first oblique portion extending outward in the width direction from the rear side to the front side on one side of the absorbent core in the width direction, and a second oblique portion extending outward in the width direction from the rear side to the front side on the other side of the absorbent core in the width direction. [6] The disposable diaper according to [4] or [5], wherein the groove portion includes a plurality of widthwise extending portions arranged in a line in the front-to-rear direction, and the widthwise extending portions are longer the closer to the front they are arranged. [7] The disposable diaper according to any one of [1] to [6], wherein the absorbent core has no openings or recesses in the middle and front portions. [Effects of the Invention]

[0007] When the disposable diaper of the present invention is laid out flat under the buttocks of a supine wearer, the markers on the absorbent core can be used as a guide to position the disposable diaper appropriately relative to the wearer's crotch, making it easier for caregivers to properly place the disposable diaper around the wearer's waist. [Brief explanation of the drawings]

[0008] [Figure 1] 1 shows an example of a disposable diaper of the present invention, and is a plan view of the disposable diaper as viewed from the top sheet side. [Figure 2]2 is a cross-sectional view of the disposable diaper shown in FIG. 1 taken along line II-II. [Figure 3] 2 shows a plan view of an absorbent core provided in the disposable diaper shown in FIG. 1. [Figure 4] 1 is a plan view of an example of an absorbent core provided in a disposable diaper of the present invention. [Figure 5] 1 is a plan view of an example of an absorbent core provided in a disposable diaper of the present invention. [Figure 6] 1 is a plan view of an example of an absorbent core provided in a disposable diaper of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The disposable diaper of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments shown in the drawings. Figs. 1 to 3 show an example of a disposable diaper of the present invention. Fig. 1 shows a plan view of the disposable diaper as seen from the topsheet side, Fig. 2 shows a cross-sectional view of the disposable diaper shown in Fig. 1 taken along line II-II, and Fig. 3 shows a plan view of an absorbent core provided in the disposable diaper shown in Fig. 1. Figs. 4 to 6 show other examples of absorbent cores that can be provided in the disposable diaper of the present invention. In the drawings, arrow x represents the width direction, arrow y represents the front-to-back direction, and the direction perpendicular to the plane formed by arrows x and y represents the thickness direction z. Note that in Fig. 1, the upper side of the drawing corresponds to the front side of the diaper, and the lower side of the drawing corresponds to the rear side of the diaper.

[0010] The disposable diaper 1 comprises a diaper body 2 and fastening tapes 16 attached to both sides of the diaper body 2 in the width direction x. The diaper body 2 has a front abdominal section, a rear dorsal section, and a crotch section located therebetween, and the fastening tapes 16 are attached to both sides of the rear dorsal section of the diaper body 2. When the disposable diaper 1 is worn, the front abdominal section is placed against the wearer's abdomen, the crotch section against the wearer's groin, and the rear dorsal section against the wearer's back, and the fastening tapes 16 are fastened to the front abdominal section of the diaper body 2 to form it into a pants-like shape.

[0011] The disposable diaper 1 has a front-to-back direction y and a width direction x. The front-to-back direction y corresponds to the direction extending from the front to the back of the wearer's crotch when the disposable diaper 1 is worn. The width direction x refers to a direction on the same plane as the disposable diaper 1 and perpendicular to the front-to-back direction y, and corresponds to the left-to-right direction of the wearer when the disposable diaper 1 is worn. In addition, in the present invention, the skin-facing side of the disposable diaper 1 refers to the side facing the skin of the wearer when the disposable diaper 1 is worn, and the non-skin-facing side of the disposable diaper 1 refers to the side facing away from the wearer when the disposable diaper 1 is worn.

[0012] The front, crotch, and rear sections are defined by dividing the diaper body 2 into three sections in the front-to-back direction y, with the crotch section located between the front and rear sections. The diaper body 2 is preferably formed so that the front and rear sections are wider than the crotch section.

[0013] The diaper body 2 has a top sheet 3, a back sheet 4, and an absorbent core 5 disposed therebetween. The top sheet 3 is a sheet that faces the wearer when the disposable diaper 1 is worn. The back sheet 4 is a sheet that faces away from the wearer when the disposable diaper 1 is worn, i.e., is located on the outer side. Urine and other excretions from the wearer pass through the top sheet 3 and are contained by the absorbent core 5. The back sheet 4 prevents excretions from leaking to the outside.

[0014] The top sheet 3 is preferably liquid permeable and can be made of, for example, a nonwoven fabric made of hydrophilic fibers such as cellulose, rayon, cotton, etc., or a nonwoven fabric made of hydrophobic fibers such as polyolefin (e.g., polypropylene, polyethylene), polyester (e.g., PET), polyamide (e.g., nylon), etc., in which the surface of the hydrophobic fibers has been made hydrophilic with a surfactant. The top sheet 3 may also be made of woven fabric, knitted fabric, perforated resin film, etc.

[0015] The back sheet 4 is preferably liquid-impermeable and can be made of a nonwoven fabric formed from hydrophobic fibers such as polyolefin (e.g., polypropylene, polyethylene), polyester (e.g., PET), polyamide (e.g., nylon), etc., or a resin film, etc. The back sheet 4 may also be a laminate of a nonwoven fabric and a film.

[0016] The absorbent core 5 is not particularly limited as long as it contains an absorbent material capable of absorbing urine and other bodily waste. For example, a molded body obtained by molding an absorbent material into a predetermined shape can be used as the absorbent core 5. The absorbent core 5 may be covered with a covering sheet such as a paper sheet (e.g., tissue paper or thin paper) or a liquid-permeable nonwoven fabric. Examples of the absorbent material include hydrophilic fibers such as pulp fibers, and water-absorbent resins such as polyacrylic acid, polyaspartic acid, cellulose, and starch-acrylonitrile. The water-absorbent material may also include heat-fusible fibers such as polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and polyamide fibers. These heat-fusible fibers are preferably hydrophilized with a surfactant or the like to enhance their affinity for urine and other wastes.

[0017] A sheet-like absorbent body may be used as the absorbent core 5. The sheet-like absorbent body is configured, for example, to have a water-absorbent resin between nonwoven fabrics but no pulp fibers. A sheet-like absorbent body configured in this manner can achieve a high absorption capacity because it has a water-absorbent resin between the nonwoven fabrics. Furthermore, because the sheet-like absorbent body does not have pulp fibers between the nonwoven fabrics, it can be formed thin and not bulky.

[0018] The absorbent material preferably contains hydrophilic fibers to increase the absorption rate of urine and the like. Furthermore, the absorbent material preferably contains a water-absorbent resin to increase the absorption capacity. Therefore, the absorbent core 5 preferably contains hydrophilic fibers (particularly pulp fibers) and a water-absorbent resin. In this case, it is preferable to use, for example, a collection of hydrophilic fibers to which a water-absorbent resin is mixed or dispersed.

[0019] The absorbent core 5 may be composed of a single layer or multiple layers, for example, the absorbent core 5 may have an upper absorbent layer and a lower absorbent layer.

[0020] The absorbent article 1 preferably has leakage prevention flaps 9 on both sides in the width direction x on the skin-facing side. The provision of the leakage prevention flaps 9 prevents side leakage of urine and the like. The leakage prevention flaps 9 can be formed by providing side sheets 8 on both sides in the width direction x of the top sheet 3. Specifically, the side sheets 8 are joined to the top sheet 3 at side joints 8A, and the leakage prevention flaps 9 are formed from portions of the side sheets 8 that are inward in the width direction x from the side joints 8A. It is preferable that the side sheets 8 are arranged on the skin-facing side of the top sheet 3 at the side joints 8A. The side joints 8A are the starting points for the rise of the leakage prevention flaps 9, and the inner ends of the side sheets 8 in the width direction x are free ends.

[0021] The leakage barrier flaps 9 are preferably provided with flap elastic members 10. That is, the flap elastic members 10 are preferably provided inward in the width direction x from the side joints 8A of the side sheets 8. By providing the flap elastic members 10, the inward parts of the side sheets 8 in the width direction x rise toward the wearer's skin, forming the leakage barrier flaps 9. The flap elastic members 10 are provided so as to extend in the front-to-back direction y. Note that the front and rear ends of the leakage barrier flaps 9 may be joined to the top sheet 3 inward in the width direction x from the side joints 8A, which causes the leakage barrier flaps 9 to rise by tilting inward in the width direction x, thereby improving the leakage prevention effect of urine, loose stool, etc.

[0022] The side sheets 8 are preferably liquid-impermeable and can be made of a sheet material that can be used for the back sheet 4. The side sheets 8 are preferably made of, for example, a liquid-impermeable plastic film or a liquid-impermeable nonwoven fabric.

[0023] When nonwoven fabric is used as each of the above-described sheets, it is preferable to use a spunbond nonwoven fabric, an air-through nonwoven fabric, a point-bond nonwoven fabric, a melt-blown nonwoven fabric, an air-laid nonwoven fabric, an SMS nonwoven fabric, etc. The basis weight (mass per unit area) of each sheet is 10 g / m 2 More than 12g / m is preferable. 2 More preferably, 40 g / m 2 Less than 30 g / m 2 The following is more preferred:

[0024] The diaper body 2 preferably has leg elastic members 11 extending in the front-to-rear direction y on both sides of the width direction x. The provision of the leg elastic members 11 allows gathers to be formed around the wearer's legs, improving the fit around the legs and preventing side leakage.

[0025] The diaper body 2 may be provided with waist elastic members 12 extending in the width direction x at the ends in the front-to-rear direction y. The contractile force of the waist elastic members 12 forms gathers around the wearer's waist, preventing leakage of urine and other excrement from the back and abdominal areas.

[0026] Each elastic member can be made of an elastic stretchable material commonly used in disposable diapers, such as polyurethane thread, polyurethane film, or natural rubber. The elastic members are preferably secured in a stretched state with an adhesive such as a hot-melt adhesive. For example, polyurethane threads having a fineness of 40 to 1,240 dtex are stretched at a stretch ratio of 1.1 to 5.0 and then secured. A rubber-based hot-melt adhesive is preferably used as the adhesive. The stretch ratio is defined as 1.0 in the unstretched state.

[0027] The fastening tape 16 is preferably configured with a fastener 18 provided on the skin-facing side of the tape substrate 17, and is detachable from a target tape 19 provided on the front abdominal portion of the diaper main body 2. The tape substrate 17 can be configured from any sheet material, such as a nonwoven fabric, a woven fabric, a knitted fabric, a resin film, or a laminate thereof. The fastener 18 can be a hook member of a hook-and-loop fastener or an adhesive tape. When a hook member of a hook-and-loop fastener is used as the fastener 18, it is preferable to use a loop member of a hook-and-loop fastener as the target tape 19. When an adhesive tape is used as the fastener 18, it is preferable to use a resin film as the target tape 19. The hook member of a hook-and-loop fastener is configured, for example, by a number of engaging elements, such as anchor-shaped, hook-shaped, or mushroom-shaped, protruding from a base. Preferably, the fastener 18 is a hook member of a hook-and-loop fastener, and the tape substrate 17 is made of a nonwoven fabric.

[0028] The fastening tapes 16 are preferably provided on both sides of the rear portion of the diaper main body 2 in the width direction x, for example, between the side sheets 8 and the back sheet 4 or between the top sheet 3 and the back sheet 4, and are bonded to these sheet members with an adhesive. The target tape 19 is preferably provided on the outer surface (non-skin-facing side) of the front abdominal portion of the diaper main body 2, and is preferably attached to the diaper main body 2 by a known bonding means such as an adhesive.

[0029] The target tape 19 is preferably made of a hook and loop fastener. In this case, a hook and loop fastener hook member is used as the fastener 18 of the fastening tape 16, and the target tape 19 is made of a hook and loop fastener loop member that is provided on a base and that has a loop portion that can engage with an engaging element of the hook member. A portion of the loop portion is fixed to the base and another portion is not fixed to the base, so that the engaging element of the hook member can engage with the portion of the loop portion that is not fixed to the base. Each loop portion may form a closed ring, or a portion of the ring may be open and connected to an adjacent loop portion.

[0030] The absorbent core 5 has a generally hourglass shape. Specifically, as shown in FIG. 3 , the absorbent core 5 has a front portion 5A, a rear portion 5C, and a middle portion 5B therebetween in the front-to-rear direction y, with the front portion 5A and the rear portion 5C being wider than the middle portion 5B. By forming the absorbent core 5 in this manner, the absorbent core 5 is less likely to be compressed by the wearer's legs at the middle portion 5B, and the absorbent core 5 is less likely to be distorted when the absorbent article 1 is worn. The absorbent core 5 is formed widest in the front portion 5A and / or the rear portion 5C. The length in the width direction x of the rear portion 5A and the length in the width direction x of the rear portion 5C may be the same or different.

[0031] The intermediate region 5B can be defined as the region of the absorbent core 5 excluding the front and rear ends in the front-rear direction y where the length in the width direction x is narrowest. For example, the intermediate region 5B can be defined as the region between the widest portion of the front half of the absorbent core 5 and the widest portion of the rear half where the length in the width direction x is narrowest. The absorbent core 5 preferably has a portion in the intermediate region 5B with a constant length in the width direction x. Therefore, the outer edge of the absorbent core 5 preferably has a linear portion extending in the front-rear direction y in the intermediate region 5B. The length of the intermediate region 5B in the front-rear direction y is, for example, preferably 10% or more, more preferably 20% or more, and preferably 50% or less, more preferably 40% or less of the length of the absorbent core 5 in the front-rear direction y.

[0032] The absorbent core 5 is provided with a marking portion 6 formed from an opening or a recess. The opening is provided so as to penetrate the absorbent core 5 in the thickness direction z. On the other hand, the recess is formed by partially reducing the basis weight (mass per unit area) of the absorbent core 5. In this case, the recess is preferably formed so that the basis weight is 70% by mass or less, more preferably 60% by mass or less, of the portion other than the recess. When a recess is formed in the absorbent core 5, the recess is preferably formed on the surface of the absorbent core 5 facing the top sheet 3. When the absorbent core 5 is composed of an upper absorbent layer facing the top sheet 3 and a lower absorbent layer facing the back sheet 4, an opening is formed in the upper absorbent layer, and the lower absorbent layer is provided so as to cover the opening, thereby forming a recess on the surface of the absorbent core 5 facing the top sheet 3.

[0033] The marker portion 6 is provided as a guide for aligning the disposable diaper 1 with respect to the crotch area of ​​the wearer when the caregiver or the like is putting the disposable diaper 1 on a wearer in a supine position. When the disposable diaper 1 is laid out flat under the buttocks of a wearer in a supine position, the position of the disposable diaper 1 can be adjusted so that the marker portion 6 is located between the bases of the wearer's left and right thighs when viewed from above the wearer, thereby allowing the disposable diaper 1 to be placed in an appropriate position with respect to the wearer's crotch area. Thereafter, the front abdominal part of the disposable diaper 1 is placed against the wearer's abdomen through the crotch area, and the fastening tape 16 is fastened to the target tape 19, making it easy for the caregiver or the like to properly put the disposable diaper 1 around the wearer's waist.

[0034] In order for the marker portion 6 to function as described above, the marker portion 6 is provided in the rear portion 5C of the absorbent core 5 so as to be located forward of the fastening tape 16. Specifically, the marker portion 6 is provided so that, in a planar state of the disposable diaper 1, the rear end of the marker portion 6 is located forward of the fastening tape 16 (more specifically, forward of the front end of the fastening tape 16) and the front end of the marker portion 6 is located rear of the middle portion 5B of the absorbent core 5 (more specifically, rear of the rear end of the middle portion 5B of the absorbent core 5). In Figs. 1 and 4 to 6, the marker portion 6 is provided in the absorbent core 5 within a range S in the front-to-rear direction y that is forward of the fastening tape 16 and rear of the middle portion 5B. By providing the marker portion 6 in this manner, the marker portion 6 can function as a guide for aligning the disposable diaper 1 with respect to the wearer's crotch region. In order to make the marker portion 6 easily recognizable by caregivers and the like, the length of the marker portion 6 in the front-to-back direction y (the length from the front end to the rear end of the marker portion 6) is preferably 20 mm or more, more preferably 30 mm or more, and even more preferably 40 mm or more.

[0035] The shape of the marker portion 6 is not particularly limited. The shape of the marker portion 6 is not particularly limited as long as it is provided within the range S in the front-rear direction y of the absorbent core 5 described above. The marker portion 6 may be formed from a single opening or recess provided in the absorbent core 5, or may be formed by combining multiple openings or recesses. In the latter case, the multiple openings or recesses constituting the marker portion 6 may be arranged side by side in the width direction x but not in the front-rear direction y, or may be arranged side by side in the front-rear direction y but not in the width direction x, or may be arranged side by side in both the width direction x and the front-rear direction y. Figures 3 to 6 show examples of absorbent cores 5 provided with marker portions 6 of various shapes, and thus the marker portion 6 can have a variety of shapes. In Figures 4 and 6, the marker portion 6 is formed from a single opening or recess, in Figures 3 and 5(b), the marker portion 6 is formed from a combination of multiple openings or recesses aligned in the width direction x, and in Figure 5(a), the marker portion 6 is formed from a combination of multiple openings or recesses aligned in the front-to-rear direction y.

[0036] The front end of the marker portion 6 is preferably located 25% to 45% of the length of the diaper main body 2 in the front-to-rear direction y, and more preferably 28% to 42% of the length, from the rear end of the diaper main body 2. In other words, when the relative positions of the diaper main body 2 in the front-to-rear direction y are defined as 0% for the front end and 100% for the rear end, the front end of the marker portion 6 is preferably located in the range of 55% to 75%, and more preferably 58% to 72%. If the front end of the marker portion 6 is located in this manner, the marker portion 6 can be easily recognized from above when the disposable diaper 1 is laid out flat under the buttocks of a wearer in a supine position.

[0037] The marker portion 6 is preferably provided away from the outer edge of the absorbent core 5, i.e., preferably provided so as not to contact the outer edge of the absorbent core 5. For example, the marker portion 6 is preferably not provided in an area within 30 mm of the outer edge of the absorbent core 5, and more preferably not provided in an area within 45 mm.

[0038] The rear portion 5C of the absorbent core 5 has a widening portion whose width gradually increases rearward from the rear end of the intermediate portion 5B, and the marker portion 6 is preferably provided on the widening portion of the rear portion 5C of the absorbent core 5. This allows the absorbent core 5 to fit suitably from the buttocks to the crotch area of ​​the wearer when the disposable diaper 1 is worn around the waist of the wearer using the marker portion 6 as a guide. Furthermore, when the wearer moves their legs back and forth while wearing the disposable diaper 1, the absorbent core 5 is less likely to get in the way.

[0039] The marker portions 6 are preferably provided approximately symmetrically with respect to the center line of the absorbent core 5 in the width direction x (i.e., the center line extending in the front-rear direction y). This makes it easy to appropriately position the disposable diaper 1 in the left-right direction with respect to the wearer's crotch using the marker portions 6 as a guide. From the same perspective, it is preferable that the marker portions 6 be provided in the center of the absorbent core 5 in the width direction x, and not at either end in the width direction x. Specifically, as shown in FIG. 3 , the length W of the marker portions 6 from one end to the other in the width direction x is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less, of the length in the width direction x of the rear portion 5C of the absorbent core 5. There is no particular restriction on the lower limit of the length W of the marker portions 6 from one end to the other in the width direction x, but for example, the length W of the marker portions 6 from one end to the other in the width direction x is preferably 5% or more, more preferably 10% or more, and even more preferably 15% or more of the length in the width direction x of the rear portion 5C of the absorbent core 5. The length in the width direction x of the rear portion 5C of the absorbent core 5 described here means the maximum length in the width direction x of the rear portion 5C of the absorbent core 5. The length W from one end to the other end in the width direction x of the marker portion 6 is also preferably shorter than the length in the width direction x of the middle portion 5B of the absorbent core 5, and is, for example, preferably 80% or less of the length in the width direction x of the middle portion 5B of the absorbent core 5, more preferably 70% or less, and even more preferably 60% or less.

[0040] The length W from one end to the other end in the width direction x of the marker portion 6 is preferably at least 0.4 times, more preferably at least 0.5 times, and preferably at most 3.0 times, more preferably at most 2.5 times, and even more preferably at most 2.0 times the length of the marker portion 6 in the front-to-rear direction y (the length from the front end to the rear end of the marker portion 6). Forming the marker portion 6 in this manner makes it easier for caregivers and others to recognize the marker portion 6 as a guide for aligning the disposable diaper 1.

[0041] The length from one end to the other end in the width direction x at the front end of the marker portion 6 is preferably longer than the length from one end to the other end in the width direction x at the rear end of the marker portion 6. Marked portions 6 formed in this manner are shown in FIGS. 3, 4, 5(a), and 6. In this case, when the disposable diaper 1 is placed under the buttocks of a wearer in a supine position and the marker portion 6 is positioned between the bases of the wearer's left and right thighs, the outer edge of the marker portion 6 in the width direction x extends along the inner contours of the wearer's left and right thighs as viewed from above. This makes it easier for caregivers and others to visually recognize that the marker portion 6 is used as a guide for aligning the disposable diaper 1 with the wearer's crotch area.

[0042] As shown in FIGS. 3 to 5, the opening or recess of the marker portion 6 is preferably formed as a groove portion 7. When the marker portion 6 is formed from an opening, the groove portion 7 is preferably formed as a through groove, and when the marker portion 6 is formed from a recess, the groove portion 7 is preferably formed as a bottomed groove. The groove portion 7 is preferably formed so that the extension length of the groove portion 7 is three times or more, more preferably four times or more, and even more preferably five times or more, the width of the groove portion 7. By forming the marker portion 6 as a groove portion 7, it becomes easier for caregivers and the like to visually recognize that the marker portion 6 is not simply an opening or recess, but is used as a guide for aligning the disposable diaper 1 with the wearer's crotch. Furthermore, the absorption capacity of the absorbent core 5 can be more easily secured.

[0043] The extension direction of the groove portion 7 is not particularly limited. The groove portion 7 may extend in the front-rear direction y, in the width direction x, or in a direction oblique to the front-rear direction y, or a combination of these. The groove portion 7 may extend linearly or in a curved line, or a combination of these. The width of the groove portion 7 is, for example, preferably 3 mm or more, more preferably 5 mm or more, and even more preferably 8 mm or more, and preferably 25 mm or less, more preferably 20 mm or less, and even more preferably 15 mm or less. The width of the groove portion 7 may be constant along the extension direction of the groove portion 7, or may be varied.

[0044] As one embodiment, as shown in Figs. 3 and 4, the grooves 7 preferably include a first oblique portion extending outward in the width direction x from the rear side to the front side on one side of the absorbent core 5 in the width direction x, and a second oblique portion extending outward in the width direction x from the rear side to the front side on the other side of the absorbent core 5 in the width direction x. Providing the grooves 7 in this manner makes it easier for caregivers and others to visually recognize that the marker portions 6 formed by the grooves 7 are used as guides for aligning the disposable diaper 1 with respect to the wearer's crotch. In this case, the one and the other sides of the absorbent core 5 in the width direction x refer to the one and the other sides across the center line of the absorbent core 5 in the width direction x. The first and the second oblique portions may be spaced apart from each other in the width direction x, as shown in Fig. 3, or may be directly connected to each other, as shown in Figs. 4(a) and (b), or may be connected to each other via a width-direction extending portion, as shown in Fig. 4(c).

[0045] In another embodiment, as shown in Fig. 5(a), the groove 7 may include a plurality of widthwise extending portions arranged side by side in the front-to-rear direction y, and the widthwise extending portions may be formed so that the more forwardly they are arranged, the longer their lengths in the width direction x. Even when the groove 7 is provided in this manner, it is easy for a caregiver or the like to visually recognize that the mark portion 6 formed from the groove 7 is used as a guide for aligning the disposable diaper 1 with the wearer's crotch. In this case, the number of widthwise extending portions arranged side by side in the front-to-rear direction y is preferably 2 to 5, and more preferably 3 to 5.

[0046] In yet another embodiment, as shown in Fig. 5(b), the groove portion 7 may be formed so as to extend in the front-rear direction y. Also, as shown in Fig. 6, the mark portion 6 may be formed not as a groove portion but so as to have an area of ​​a predetermined length in the front-rear direction y and the width direction x.

[0047] The marker portion 6 is preferably formed so that the front end of the marker portion 6 is easily visible. To this end, for example, the marker portion 6 is preferably formed with the deepest opening or recess at the front end. By forming the marker portion 6 in this manner, when the disposable diaper 1 is laid out flat under the buttocks of a wearer in a supine position, the marker portion 6 is easily visible, and it becomes easier to properly adjust the position of the disposable diaper 1 using the marker portion 6 as a guide. From the same viewpoint, it is preferable that the absorbent core 5 does not have any openings or recesses other than the marker portion 6 near the front end of the marker portion 6 (for example, within a range of 30 mm from the front end of the marker portion 6). Furthermore, when the marker portion 6 is formed as a groove portion 7, the front end of the groove portion 7 in the front-rear direction y is preferably formed so that it is widest relative to the extension direction of the groove portion 7.

[0048] Among the embodiments shown in the drawings, for example, in the embodiment of Fig. 5(a), of the multiple widthwise extending portions constituting the groove portion 7, the widthwise extending portion located at the front side is preferably formed wider (i.e., longer in the front-to-rear direction y in Fig. 1) than the widthwise extending portions located further rearward. In the embodiment of Fig. 5(b), the groove portion 7 is preferably formed so as to be easily visible between the wearer's thighs. In the embodiment of Fig. 6, the front end of the marker portion 6 is preferably formed sufficiently wide.

[0049] Regardless of the above, the mark portion 6 may be formed so that the opening or recess is deepest at the rear end. Also, when the mark portion 6 is provided as a groove portion 7, the rear end of the groove portion 7 in the front-rear direction y may be formed so that it is widest in the extending direction of the groove portion 7.

[0050] It is preferable that the rear portion 5C of the absorbent core 5 does not have any openings or recesses (openings or recesses other than the marker portion 6) outside the marker portion 6 in the width direction x. This makes it easier for caregivers and the like to recognize the marker portion 6, and makes it easier for the marker portion 6 to function as a guide for aligning the disposable diaper 1 with respect to the wearer's crotch. From the same perspective, it is preferable that the rear portion 5C of the absorbent core 5 does not have any openings or recesses behind the front end of the fastening tape 16. It is also preferable that the rear half of the intermediate portion 5B of the absorbent core 5 does not have any openings or recesses.

[0051] The absorbent core 5 preferably has no openings or recesses in the middle portion 5B, and further preferably has no openings or recesses in the front portion 5A either. This makes it easier for caregivers and others to recognize the marker portion 6, and makes it easier for the marker portion 6 to function as a guide for aligning the disposable diaper 1 with the wearer's crotch area.

[0052] The marker portion 6 may be colored so as to be visible from the skin-facing side of the disposable diaper 1. This makes it easier for caregivers and the like to see the marker portion 6. In this case, it is preferable that the marker portion 6 be colored in a color other than white. The opening can be colored, for example, by providing a colored sheet on the non-skin-facing side of the absorbent core 5 at a position overlapping the opening, or by coloring a position of the backsheet 4 overlapping the opening. The recess can be colored by coloring the recess in the absorbent core 5 or by providing a colored sheet in the recess in the absorbent core 5. Alternatively, the marker portion 6 may be formed in the absorbent core 5 by coloring the opening or recess in the absorbent core 5 that will become the marker portion 6 and leaving the opening or recess in the absorbent core 5 that will not become the marker portion 6 uncolored. [Explanation of symbols]

[0053] 1: Disposable diapers 2: Diaper body 3: Top sheet 4: Back seat 5: absorbent core, 5A: front part, 5B: middle part, 5C: rear part 6: Marking section 7: Groove 8: Side seat 9: Leak-proof flap 16: Fastening tape 19: Target tape

Claims

1. A disposable diaper having a front-rear direction and a width direction, and fastening tapes attached to both sides of the width direction of the rear part of the diaper body, The diaper body has an absorbent core disposed between a top sheet and a back sheet, the absorbent core has a front section, a rear section and an intermediate section therebetween, the front section and the rear section being wider than the intermediate section; The absorbent core is provided with a marking portion formed from an opening or a recess, When the diaper is in a flat state, the rear end of the marking portion is located forward of the fastening tape, and the front end of the marking portion is located rearward of the middle portion of the absorbent core, A disposable diaper characterized in that the length from one end to the other end in the width direction at the front end of the marker portion is longer than the length from one end to the other end in the width direction at the rear end of the marker portion.

2. The marking portions are provided approximately symmetrically with respect to a center line in the width direction of the absorbent core, 2. The disposable diaper according to claim 1, wherein the length from one end to the other end in the width direction of the marking portion is 50% or less of the length in the width direction of the rear portion of the absorbent core.

3. The disposable diaper according to claim 1 or 2, wherein the opening or recess of the marking portion is formed as a groove.

4. 4. The disposable diaper according to claim 3, wherein the groove portion includes a first oblique portion extending outward in the width direction from the rear side to the front side on one side of the absorbent core in the width direction, and a second oblique portion extending outward in the width direction from the rear side to the front side on the other side of the absorbent core in the width direction.

5. 4. The disposable diaper according to claim 3, wherein the groove portion includes a plurality of widthwise extending portions arranged side by side in the front-to-rear direction, and the widthwise extending portions arranged closer to the front have a longer widthwise length.

6. 3. The disposable diaper according to claim 1, wherein the absorbent core has no openings or recesses in the middle and front portions.

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