Disposable diaper

Abstract

To provide a disposable diaper which allows a fastening tape to be securely tied to a target tape.SOLUTION: In a disposable diaper, a target tape 11 is provided on an outer surface side of a diaper body 2. The target tape 11 has a first region 17 and a second region 18 in a width direction x, and a net structure 14 is formed of threads on a base layer 12. The net structure 14 has a lattice part 15 and a skewing part 16. In the skewing part 16, when a part in which the threads are arranged in a manner to obliquely connect two lattice points from the back side to the front side from one side to the other side in the width direction x is a first skewing part 16A, and a part in which the threads are arranged in a manner to obliquely connect two lattice points from the back side to the front side from the other side to the one side in the width direction x is a second skewing part 16B, in the first region 17, the number of the first skewing parts 16A is larger than the number of the second skewing parts 16B, and in the second region 18, the number of the second skewing parts 16B is larger than the number of the first skewing parts 16A.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] Conventionally, tape-type disposable diapers have been widely known. A tape-type disposable diaper is formed into a pant shape and worn by attaching fastening tapes provided on the left and right sides of the diaper to target tapes provided on the outer surface side of the diaper. For example, such disposable diapers are disclosed in Patent Documents 1 to 3.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a tape-type disposable diaper, it is required that the fastening tape can be firmly attached to the target tape when worn, so that the disposable diaper can be stably worn around the waist of the wearer. The present invention has been made in view of the above circumstances, and an object thereof is to provide a disposable diaper provided with fastening tapes on both sides in the width direction and a target tape for attaching the fastening tape on the outer surface side, and capable of easily engaging the hook member of the fastening tape with the target tape.

Means for Solving the Problems

[0005] The disposable diaper in the embodiment of the present invention that has solved the above problems is a tape-type disposable diaper having a width direction and a front-back direction, with fastening tapes provided on both sides in the width direction of the diaper body; the fastening tape is provided with a hook member of a surface fastener; on the outer surface side of the diaper body, a target tape is provided with which the hook member of the fastening tape is engaged when the diaper is worn; the target tape has a base layer and an engagement layer provided on the outer surface side of the base layer and formed with a network structure by yarns; the network structure includes a lattice part in which the yarns are arranged in a square lattice pattern and a diagonal part in which the yarns are arranged so as to obliquely connect at least two lattice points of the square lattice; the target tape has two regions with respect to the width direction, a first region located on one side in the width direction and a second region located on the other side in the width direction; among the diagonal parts, those in which the yarns are arranged so as to obliquely connect two lattice points from the rear side to the front side in the front-back direction from one side to the other side in the width direction are defined as the first diagonal part, and those in which the yarns are arranged so as to obliquely connect two lattice points from the rear side to the front side in the front-back direction from the other side to the one side in the width direction are defined as the second diagonal part, and it is characterized in that in the first region, the number of the first diagonal parts is larger than the number of the second diagonal parts, and in the second region, the number of the second diagonal parts is larger than the number of the first diagonal parts.

[0006] As described above, the disposable diaper in the embodiment of the present invention is provided with a target tape formed with a network structure by yarns. The target tape has two regions, a first region and a second region, with respect to the width direction. The first region is formed so as to include more first diagonal parts in the network structure, and the second region is formed so as to include more second diagonal parts in the network structure. Therefore, when the disposable diaper is worn, even if there is one knob part provided on the fastening tape, the hook member of the knob part is likely to be engaged with the corresponding region of the target tape, so that the fastening tape can be firmly fixed to the target tape.

[0007] Also, in another embodiment, the target tape may have a third region and a fourth region which are further divided into two regions in the front-rear direction. In this case, on the target tape, there are arranged a first region located on one side in the width direction at the rear side in the front-rear direction, a second region located on the other side in the width direction at the rear side in the front-rear direction, a third region located on one side in the width direction at the front side in the front-rear direction, and a fourth region located on the other side in the width direction at the front side in the front-rear direction. In the first region and the fourth region, the number of the first diagonal portions is preferably more than the number of the second diagonal portions, and in the second region and the third region, the number of the second diagonal portions is preferably more than the number of the first diagonal portions. When the target tape is formed in this way, for example, when two knob portions of the fastening tape are provided side by side in the front-rear direction, when wearing a disposable diaper, the hook members of the two knob portions of the fastening tape are easily engaged with the corresponding regions of the target tape, and the fastening tape can be firmly fixed to the target tape.

[0008] In an embodiment of the disposable diaper of the present invention, the fastening tapes arranged on both sides in the width direction of the diaper body preferably include a first fastening tape having a first tape body portion attached to one side of both sides in the width direction of the diaper body and a first knob portion extending from the first tape body portion at least to one side in the width direction, and a second fastening tape having a second tape body portion attached to the other side of both sides in the width direction of the diaper body and a second knob portion extending from the second tape body portion at least to the other side in the width direction.

[0009] As another embodiment of the disposable diaper of the present invention, the first gripping portion may have a front gripping portion and a rear gripping portion that extend in the width direction from the first tape main body portion and are spaced apart in the front-rear direction, and the second gripping portion may have a front gripping portion and a rear gripping portion that extend in the width direction from the second tape main body portion and are spaced apart in the front-rear direction. In this case, hook members are provided on the front gripping portion and the rear gripping portion respectively. The hook member has a base and a plurality of engaging elements protruding from the base. It is preferable that the engaging elements of the hook member provided at least on the rear gripping portion are arranged side by side in the front-rear direction.

[0010] Furthermore, as an embodiment of the hook member, on the rear gripping portion, as the hook member, an outer hook member and an inner hook member that are spaced apart from the outer hook member in the width direction and are provided inward in the width direction of the outer hook member are provided. The outer hook member has a height of the engaging element provided in a region along the inner edge in the width direction higher than the height of the engaging element provided in a region more outward in the width direction. The inner hook member may be formed such that the height of the engaging element provided in a region along the outer edge in the width direction is higher than the height of the engaging element provided in a region more inward in the width direction.

[0011] On the rear gripping portion, as the hook member, an outer hook member and an inner hook member that are spaced apart from the outer hook member in the width direction and are provided inward in the width direction of the outer hook member are provided. The outer hook member has a larger size of the top of the engaging element provided in a region along the inner edge in the width direction than the size of the top of the engaging element provided in a region more outward in the width direction. The inner hook member may be formed such that the size of the top of the engaging element provided in a region along the outer edge in the width direction is larger than the size of the top of the engaging element provided in a region more inward in the width direction.

[0012] When two gripping portions of the fastening tape are provided side by side in the front-rear direction, in the region where the rear gripping portion overlaps the front gripping portion, by changing the shape of the hook member as described above, it is also possible to make it easier for the rear gripping portion to engage on the front gripping portion.

[0013] When wearing the diaper, it is preferable that the first knob portion of the first fastening tape is engaged with at least the first region, and the second knob portion of the second fastening tape is engaged with at least the second region.

[0014] Also, as one embodiment of the disposable diaper of the present invention, it is preferable that two lattice points obliquely connected by a thread in the first diagonal portion are two adjacent square lattice points, and two lattice points obliquely connected by a thread in the second diagonal portion are two adjacent square lattice points.

[0015] As one embodiment of the disposable diaper of the present invention, the target tape may have a first target tape and a second target tape. In this case, the first target tape can be arranged so as to be located on one side in the width direction as the first region, and the second target tape can be arranged so as to be located on the other side in the width direction as the second region.

Advantages of the Invention

[0016] The disposable diaper in the embodiment of the present invention can easily engage the hook member of the fastening tape with the target tape.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0018] The configuration of the disposable diaper according to the embodiment of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the embodiments shown in the drawings.

[0019] In FIGS. 1 to 3, an example of the disposable diaper of the present invention is shown. FIG. 1 represents a plan view of the disposable diaper seen from the skin side, FIG. 2 represents an example of a plan view of the disposable diaper shown in FIG. 1 seen from the outer surface side, and FIG. 3 represents a cross-sectional view taken along line III-III of the disposable diaper shown in FIGS. 1 and 2. In the drawings of the present application, arrow x represents the width direction, arrow y represents the front-rear direction, and the direction perpendicular to the plane formed by arrows x and y represents the thickness direction z. In FIGS. 1 and 2, 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.

[0020] The disposable diaper 1 has a diaper main body 2 and fastening tapes 31 provided on both sides in the width direction x of the diaper main body 2. In FIGS. 1 and 2, the diaper main body 2 has a front side portion, a rear side portion, and a crotch portion located between them, and the fastening tapes 31 are attached to both sides of the rear side portion of the diaper main body 2. When wearing the disposable diaper 1, the front side portion is applied to the wearer's abdomen, the crotch portion is applied to the wearer's crotch, the rear side portion is applied to the wearer's back, and the fastening tapes 31 are fastened to the target tape 11 provided on the outer surface side of the front side portion of the diaper main body 2, thereby forming it into a pant shape for use. Although not shown in the drawings, the fastening tapes 31 may be attached to both sides of the front side portion of the diaper main body 2, and the target tape 11 may be provided on the outer surface side of the rear side portion of the diaper main body 2.

[0021] The disposable diaper 1 has a front-back direction y and a width direction x. The front-back direction y corresponds to the direction extending in the front-back direction of the wearer's crotch when the disposable diaper is worn. The width direction x means a direction that is on the same plane as the disposable diaper and orthogonal to the front-back direction y, and corresponds to the left-right direction of the wearer when the disposable diaper is worn. Also, in the present invention, the skin side of the disposable diaper means the side facing the wearer's skin when the disposable diaper is worn, and the outer surface side of the disposable diaper means the side facing away from the wearer when the disposable diaper is worn.

[0022] The diaper main body 2 has a topsheet 3, a backsheet 4, and an absorber 5 disposed between them. The topsheet 3 is a sheet located on the wearer side when the disposable diaper is worn, and the backsheet 4 is a sheet located on the side opposite to the wearer, that is, the outer surface side when the disposable diaper is worn. Urine and the like excreted from the wearer pass through the topsheet 3 and are accommodated in the absorber 5. The backsheet 4 prevents the excrement from leaking to the outside.

[0023] The topsheet 3 is preferably liquid-permeable. For example, a nonwoven fabric formed from hydrophilic fibers such as cellulose, rayon, and cotton, or a nonwoven fabric formed from hydrophobic fibers such as polyolefins (e.g., polypropylene, polyethylene), polyesters (e.g., PET), and polyamides (e.g., nylon), where the surface of the hydrophobic fibers has been hydrophilized with a surfactant, etc. can be used. Also, a woven fabric, a knitted fabric, a porous resin film, etc. may be used as the topsheet 3.

[0024] The backsheet 4 is preferably liquid-impermeable, and a nonwoven fabric formed from hydrophobic fibers such as polyolefins (e.g., polypropylene, polyethylene), polyesters (e.g., PET), and polyamides (e.g., nylon), a resin film, etc. can be used. Also, a laminate of a nonwoven fabric and a film may be used as the backsheet 4.

[0025] The absorber 5 is not particularly limited as long as it contains an absorbent material capable of absorbing excreta such as urine. As the absorber 5, for example, a molded body obtained by molding an absorbent material into a predetermined shape, or a covered body obtained by covering the molded body with a covering sheet such as a paper sheet (e.g., tissue paper or blotting paper) or a liquid-permeable nonwoven fabric can be used. Examples of the absorbent material include hydrophilic fibers such as pulp fibers, and water-absorbing resins such as polyacrylic acid-based, polyaspartic acid-based, cellulose-based, and starch-acrylonitrile-based resins. Also, the absorbent material may contain heat-sealable fibers such as polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and polyamide fibers. These heat-sealable fibers may be hydrophilized with a surfactant or the like in order to enhance the affinity with urine or the like.

[0026] The absorbent material preferably contains hydrophilic fibers from the viewpoint of enhancing the absorption rate of urine or the like. Further, from the viewpoint of increasing the absorption capacity, the absorbent material preferably contains a water-absorbing resin. Therefore, the absorber preferably contains hydrophilic fibers (particularly pulp fibers) and a water-absorbing resin. In this case, for example, it is preferable to use a mixture or dispersion of a water-absorbing resin in an aggregate of hydrophilic fibers.

[0027] The absorber 5 may be a sheet-like absorber. Examples of the sheet-like absorber include those formed such that a water-absorbing resin is provided between nonwoven fabrics and no pulp fibers are present. Since the sheet-like absorber formed in this manner has a water-absorbing resin between the nonwoven fabrics, a high absorption capacity can be achieved. Further, since the sheet-like absorber has no pulp fibers between the nonwoven fabrics, it can be formed into a thin shape without bulkiness.

[0028] The shape (planar shape) of the absorber 5 is not particularly limited. The shape of the absorber (or the molded body constituting the absorber) may be appropriately determined according to the application, and examples thereof include a rectangular shape, an hourglass shape, a gourd shape, and a racket shape. In addition, from the viewpoint of making the absorber 5 or the molded body constituting the absorber 5 less likely to be distorted even when it is sandwiched between the thighs of the wearer and compressed in the width direction x, it is preferable that the absorber 5 or the molded body constituting the absorber 5 is formed in an hourglass shape.

[0029] As one of the embodiments, it is preferable that side sheets 6 extending outward in the width direction x from the top sheet 3 are joined to both sides of the top sheet 3 in the width direction x of the diaper body 2. The side sheet 6 is preferably liquid-impermeable and can be composed of a sheet material usable for the back sheet 4.

[0030] Preferably, rising flaps 7 are formed on both sides of the top sheet 3 in the width direction x by the side sheets 6. In this case, as shown in FIG. 3, the side sheet 6 is preferably provided with an elastic member 8 for rising that extends in the front-rear direction y in an inner portion in the width direction x rather than the joint portion 6A with the top sheet 3. The inner portion of the side sheet 6 can be raised by the contraction force of the elastic member 8 for rising, and the rising flap 7 can be formed. By providing the rising flap 7, lateral leakage of urine or the like can be prevented. The inner surface of the end portion in the front-rear direction y of the rising flap 7 may be joined onto the top sheet 3, whereby the rising flap 7 can easily rise toward the wearer's skin when the diaper is worn.

[0031] When using a non-woven fabric as each of the above-described sheets, as the non-woven fabric, it is preferable to use a spunbond non-woven fabric, an air-through non-woven fabric, a point-bond non-woven fabric, a meltblown non-woven fabric, an airlaid non-woven fabric, an SMS non-woven fabric, or the like. The mass per unit area of each sheet is preferably 10 g / m 2 or more, more preferably 12 g / m 2 or more, and preferably 40 g / m 2 or less, more preferably 30 g / m 2 or less.

[0032] Preferably, leg elastic members 9 extending in the front-rear direction y are provided on both sides of the diaper body 2 in the width direction x. By providing the leg elastic members 9, gathers can be formed around the wearer's legs to enhance the fit around the legs and prevent lateral leakage.

[0033] An elastic member 10 for the waist extending in the width direction x may be provided at the end portion in the front-rear direction y of the diaper body 2. Due to the contraction force of the elastic member 10 for the waist, a waist gather along the wearer's torso is formed, preventing leakage of excrement such as urine from the back side or the abdominal side.

[0034] As each of the elastic members described above, an elastic stretchable material such as polyurethane thread, polyurethane film, or natural rubber, which is usually used for disposable diapers, can be used. The elastic member is preferably fixed with an adhesive such as a hot melt adhesive in an extended state. For example, a polyurethane thread with a fineness of 40 to 1,240 dtex is extended and arranged at a magnification of 1.1 to 5.0 times and then fixed. As the adhesive, a rubber-based hot melt adhesive is preferably used. Note that the magnification is defined as 1.0 times in the non-extended state.

[0035] Fastening tapes 31 are provided on both sides in the width direction x of the diaper body 2. Hook members 37 of the hook-and-loop fastener are provided on the fastening tapes 31. When wearing the disposable diaper 1, the hook members 37 of the fastening tapes 31 are fastened to the target tape 11 provided on the outer surface side of the diaper body 2. The fastening tape 31 provided on one side in the width direction x of the diaper body 2 is referred to as the first fastening tape 31A, and the fastening tape 31 provided on the other side in the width direction x of the diaper body 2 is referred to as the second fastening tape 31B. One side and the other side in the width direction x of the disposable diaper 1 correspond to the right side and the left side or the left side and the right side when the disposable diaper 1 is worn. In the disposable diaper 1 shown in the drawing, one side in the width direction x is the right side of the disposable diaper 1, and the other side in the width direction x is the left side of the disposable diaper 1.

[0036] As shown in FIGS. 6 to 8, the fastening tape 31 is configured by providing hook members 37 on a tape base material 36, and the hook members 37 are provided on the skin surface side of the tape base material 36. FIG. 6 shows an enlarged plan view of the first fastening tape 31A provided on one side in the width direction x of the disposable diaper 1 shown in FIG. 1, FIG. 7 shows an enlarged plan view of the second fastening tape 31B provided on the other side in the width direction x of the disposable diaper 1 shown in FIG. 1, and FIG. 8 shows a cross-sectional view taken along line VIII-VIII of the first fastening tape 31A shown in FIG. 6.

[0037] The fastening tape 31 has a tape main body portion 32 at least partially attached to the diaper body 2 and a knob portion 33 extending in the width direction x from the tape main body portion 32. It is preferable that the tape base material 36 constitutes the tape main body portion 32 and the knob portion 33, and the hook member 37 is provided on the knob portion 33. The first fastening tape 31A provided on one side in the width direction x of the diaper body 2 has a first tape main body portion 32A attached to one side in the width direction x of the diaper body 2 and a first knob portion 33A extending at least on one side in the width direction x from the first tape main body portion 32A. The second fastening tape 31B provided on the other side in the width direction x of the diaper body 2 has a second tape main body portion 32B attached to the other side in the width direction x of the diaper body 2 and a second knob portion 33B extending at least on the other side in the width direction x from the second tape main body portion 32B.

[0038] The knob portion 33 may be provided only one on one fastening tape 31, or may be provided plural.

[0039] As one of the embodiments, even when the first knob portion 33A and the second knob portion 33B are each one, as will be described later, the target tape 11 having two regions, the first region 17 and the second region 18, with respect to the width direction x is formed such that the first region 17 contains many first diagonal portions 16A in the mesh structure 14, and the second region 18 is formed such that the second region 18 contains many second diagonal portions 16B in the mesh structure 14. Therefore, it is easy to engage with the corresponding region of the target tape 11.

[0040] Also, as one of the embodiments, in the disposable diaper 1 shown in the drawings, two knob portions 33 are provided side by side in the front-rear direction y on one fastening tape 31. Specifically, the fastening tape 31 has a front knob portion 34 and a rear knob portion 35 that extend in the width direction x from the tape main body portion 32 and are provided at intervals in the front-rear direction y, and hook members 37 are provided on the front knob portion 34 and the rear knob portion 35, respectively. The first knob portion 33A includes a front knob portion 34 and a rear knob portion 35 that extend in the width direction x from the first tape main body portion 32A and are provided at intervals in the front-rear direction y. The second knob portion 33B includes a front knob portion 34 and a rear knob portion 35 that extend in the width direction x from the second tape main body portion 32B and are provided at intervals in the front-rear direction y. Hook members 37 are provided on the front knob portion 34 and the rear knob portion 35, respectively.

[0041] Only one hook member 37 may be provided on one knob portion 33, or a plurality of hook members 37 may be provided. When a plurality of hook members 37 are provided on one knob portion 33, it is preferable that the plurality of hook members 37 are provided at intervals from each other in the width direction x. In the disposable diaper 1 shown in the drawings, on one knob portion 33, as the hook member 37, an outer hook member 37O and an inner hook member 37I that are separated from the outer hook member 37O in the width direction x and are provided inward in the width direction x of the outer hook member 37O are provided.

[0042] As shown in FIG. 8, the hook member 37 is formed by a large number of engaging elements 39 protruding from a base 38. The shape of the engaging element 39 is not particularly limited, and examples include a hook shape, an anchor shape, a mushroom shape, and a column shape.

[0043] As the tape base material 36, non-woven fabric, woven fabric, knitted fabric, resin film, or a laminate thereof can be used. In addition, from the viewpoint of enhancing the adhesiveness between the tape base material 36 and the diaper body 2, the tape base material 36 is preferably composed of woven fabric, knitted fabric, or non-woven fabric, and more preferably composed of non-woven fabric.

[0044] The target tape 11 is provided on the outer surface side of the backsheet 4. FIG. 4 shows an enlarged plan view of a part of the target tape 11 provided on the disposable diaper 1 shown in FIG. 2. The target tape 11 has a base layer 12 and an engagement layer 13 provided on the outer surface side of the base layer 12 and having a network structure 14 formed by yarns. The network structure 14 functions as a loop portion that engages with the hook member 37. By forming the target tape 11 in this way, it is possible to ensure the engagement force with the hook member 37 of the fastening tape 31 while making the thickness of the target tape 11 thin.

[0045] The base layer 12 can be composed of a sheet-like base material, and is preferably composed of a film layer. By forming the base layer 12 from a film layer, it becomes easier for the hook member 37 to engage with the network structure 14 of the yarns formed on the base layer 12.

[0046] The yarns constituting the engagement layer 13 may be formed from any of synthetic fibers, semi-synthetic fibers, and natural fibers, and may be monofilaments or multifilaments. The yarns constituting the engagement layer 13 can be fixed to the base layer 12, for example, by an adhesive or by providing an adhesive layer between the base layer 12 and the engagement layer 13.

[0047] The network structure 14 of the engagement layer 13 includes a lattice portion 15 in which the yarns are arranged in a square lattice. Thereby, the network structure 14 can be stably formed on the base layer 12. At the lattice points of the square lattice, it is preferable that the yarns form knots. The network structure 14 may be formed from one yarn or a plurality of yarns. In view of the ease of forming the network structure 14, it is preferable that the network structure 14 is formed from a plurality of yarns.

[0048] The yarns forming the square lattice preferably extend in the width direction x and the front-rear direction y. The lattice points of the square lattice are preferably arranged at a pitch of 0.5 mm or more and 10 mm or less in the width direction x and the front-rear direction y. The pitch is more preferably 1 mm or more, even more preferably 1.5 mm or more, and more preferably 7 mm or less, even more preferably 5 mm or less.

[0049] The mesh structure 14 of the engagement layer 13 further includes a diagonal portion 16 in which the yarns are arranged so as to diagonally connect at least two lattice points of the square lattice. The yarns forming the diagonal portion 16 extend so as to diagonally connect at least two lattice points, and may extend so as to connect three or more lattice points. In the mesh structure 14, one yarn may form both the lattice portion 15 and the diagonal portion 16, or the yarns forming the lattice portion 15 and the yarns forming the diagonal portion 16 may be separate.

[0050] The diagonal portion 16 includes a first diagonal portion 16A and a second diagonal portion 16B whose diagonally extending directions are different from each other. Specifically, the diagonal portion 16 includes a first diagonal portion 16A in which the yarns are arranged so as to diagonally connect two lattice points from one side to the other side in the width direction x (from the left side to the right side in FIG. 4) from the rear side to the front side in the front-rear direction y, and a second diagonal portion 16B in which the yarns are arranged so as to diagonally connect two lattice points from the other side to the one side in the width direction x (from the right side to the left side in FIG. 4) from the rear side to the front side in the front-rear direction y. The first diagonal portion 16A and the second diagonal portion 16B are formed so as to connect lattice points that are adjacent to each other by one or two or more in the width direction x and adjacent to each other by one or two or more in the front-rear direction y. In FIG. 4, the first diagonal portion 16A and the second diagonal portion 16B are formed so as to connect lattice points that are adjacent to each other by two in the width direction x and adjacent to each other by one in the front-rear direction y.

[0051] One first diagonal part 16A and one second diagonal part 16B are formed by a yarn slantingly connecting two lattice points. One yarn may form a plurality of first diagonal parts 16A, one yarn may form a plurality of second diagonal parts 16B, or a part of one yarn may form a first diagonal part 16A and the other part may form a second diagonal part 16B. The number of the first diagonal parts 16A and the number of the second diagonal parts 16B can be obtained by counting the number of parts where the yarn slantingly connects two lattice points.

[0052] In one embodiment, the target tape 11 is configured such that the engagement layer 13 has the network structure 14 including the lattice part 15 and the diagonal part 16 as described above. As shown in FIG. 4, the target tape 11 has two regions with respect to the width direction x, a first region 17 located on one side in the width direction x (the left side in FIG. 4), and a second region 18 located on the other side in the width direction x (the right side in FIG. 4). In the first region 17, the number of the first diagonal parts 16A is larger than the number of the second diagonal parts 16B, and in the second region 18, the number of the second diagonal parts 16B is larger than the number of the first diagonal parts 16A (first embodiment). In FIG. 4, only the first diagonal part 16A is provided as the diagonal part 16 in the first region 17, and only the second diagonal part 16B is provided as the diagonal part 16 in the second region 18. However, in the first region 17, a number of the second diagonal parts 16B smaller than the number of the first diagonal parts 16A may be provided, and in the second region 18, a number of the first diagonal parts 16A smaller than the number of the second diagonal parts 16B may be provided.

[0053] Note that one target tape 11 may be divided into a plurality of regions, or separate target tapes 11 may be arranged for each region. For example, as one of the embodiments of the disposable diaper 1 of the present invention, the target tape 11 may have a first target tape as the first region 17 and a second target tape as the second region 18. In this case, the first target tape as the first region 17 can be arranged to be located on one side in the width direction x, and the second target tape as the second region 18 can be arranged to be located on the other side in the width direction x. Since the first region 17 and the second region 18 can also be arranged so as to be spaced apart from each other with the center line in the width direction x as a boundary, there is also an advantage that when the diaper is worn, the wearer and / or caregiver can easily align the center in the width direction x of the diaper with the center of the wearer's body.

[0054] When the target tape 11 is configured as described above, when the disposable diaper 1 is worn, the hook member 37 of the fastening tape 31 can be easily engaged with the target tape 11. Specifically explaining this, the tape-type disposable diaper 1 is preferably worn so as to cover the iliac crest on the side surface of the wearer's pelvis from the viewpoint of being stably supported around the wearer's waist during wearing. In this case, the disposable diaper 1 is preferably worn around the wearer's waist so as to cover the iliac crest of the wearer from above. When the disposable diaper 1 is worn in this way, the fastening tape 31 will be fastened to the target tape 11 in an oblique direction. That is, when the fastening tape 31 is fastened to the target tape 11, the fastening tape 31 will be arranged on the target tape 11 so as to go from the outside to the inside in the width direction x and from above the wearer to below the wearer. In this case, when the first region 17 and the second region 18 are formed on the target tape 11 as described above, the hook member 37 of the fastening tape 31 will be particularly easily engaged with the first diagonal portion 16A or the second diagonal portion 16B of the mesh structure 14 of the engaging layer 13 of the target tape 11.

[0055] Specifically, when wearing the disposable diaper 1, the first knob portion 33A of the first fastening tape 31A is engaged with at least the first region 17 of the target tape 11, and the second knob portion 33B of the second fastening tape 31B is engaged with at least the second region 18 of the target tape 11. The hook member 37 of the first fastening tape 31A is easily engaged with the first diagonal portion 16A of the engaging layer 13 in the first region 17 of the target tape 11, and the hook member 37 of the second fastening tape 31B is easily engaged with the second diagonal portion 16B of the engaging layer 13 in the second region 18 of the target tape 11. Therefore, even when there is only one knob portion 33 of the fastening tape 31, it can be firmly fixed to the target tape 11, and the disposable diaper 1 can be stably worn around the wearer's waist.

[0056] The disposable diaper 1 in another embodiment of the present invention can also be preferably applied to a structure in which the knob portion 33 of the fastening tape 31 has two, a front knob portion 34 and a rear knob portion 35, as shown in the drawings. The disposable diaper 1 configured in this way is suitable for so-called cross-fastening, in which the front knob portion 34 and the rear knob portion 35 provided side by side in the front-rear direction y are overlapped so as to cross each other and fixed to the target tape 11 when worn (see FIG. 11). When the fastening tape 31 is fixed to the target tape 11 by cross-fastening, the side surface of the wearer's pelvis is easily supported from above and below by the disposable diaper 1. Therefore, the fit of the disposable diaper 1 around the wearer's waist and the fit around the roots of both legs are improved, and the disposable diaper 1 can be stably worn.

[0057] When fastening the fastening tape 31 to the target tape 11 by cross-fastening, it is preferable to first fasten the front knob portion 34 to the target tape 11 and then fasten the rear knob portion 35 to the target tape 11 so as to cross and overlap with the front knob portion 34. Thereby, the disposable diaper 1 can be worn around the wearer's waist with good fit, and in particular, the fit around the roots of both legs of the wearer can be improved, and leakage of urine or the like from the crotch of the wearer can be effectively prevented. Also, the cross-fastening makes it easier to wear the disposable diaper 1.

[0058] When fastening the fastening tape 31 to the target tape 11 as described above, the rear knob portion 35 is fastened to the target tape 11 with the front knob portion 34 sandwiched therebetween. Also, the rear knob portion 35 is arranged on the target tape 11 so as to go from the outside in the width direction x toward the inside and from above the wearer toward below. Therefore, when the first region 17 and the second region 18 are formed on the target tape 11 as described above, the hook member 37 of the rear knob portion 35 easily engages with the first diagonal portion 16A or the second diagonal portion 16B of the mesh structure 14 of the engaging layer 13 of the target tape 11, and a stable engagement state can be maintained when the disposable diaper 1 is worn.

[0059] Specifically, the hook member 37 of the rear knob portion 35 of the first fastening tape 31A easily engages with the first diagonal portion 16A of the engaging layer 13 of the first region 17 of the target tape 11, and the hook member 37 of the rear knob portion 35 of the second fastening tape 31B easily engages with the second diagonal portion 16B of the engaging layer 13 of the second region 18 of the target tape 11. As a result, it becomes possible to stably fasten the fastening tape 31 to the target tape 11 by cross-fastening.

[0060] In another embodiment, as shown in FIG. 5, the target tape 11 is divided into two regions in the width direction x and also divided into two regions in the front-rear direction y. There are a first region 19 located on one side in the width direction x at the rear side in the front-rear direction y, a second region 20 located on the other side in the width direction x at the rear side in the front-rear direction y, a third region 21 located on one side in the width direction x at the front side in the front-rear direction y, and a fourth region 22 located on the other side in the width direction x at the front side in the front-rear direction y. In the first region 19 and the fourth region 22, the number of the first diagonal portions 16A is larger than the number of the second diagonal portions 16B, and in the second region 20 and the third region 21, the number of the second diagonal portions 16B is larger than the number of the first diagonal portions 16A (second embodiment). The first region 19 and the second region 20 will be located below the third region 21 and the fourth region 22 when the disposable diaper 1 is worn and the wearer stands up. In this case, in the target tape 11 in the second embodiment, the first region 19 and the second region 20 correspond to the first region 17 and the second region 18 in the target tape 11 of the above-described first embodiment, and the third region 21 and the fourth region 22 are formed on the front side in the front-rear direction y with respect to the first region 17 and the second region 18. In FIG. 5, only the first diagonal portions 16A are provided as the diagonal portions 16 in the first region 19 and the fourth region 22, and only the second diagonal portions 16B are provided as the diagonal portions 16 in the second region 20 and the third region 21. However, in the first region 19 and the fourth region 22, a number of the second diagonal portions 16B smaller than the number of the first diagonal portions 16A may be provided, and in the second region 20 and the third region 21, a number of the first diagonal portions 16A smaller than the number of the second diagonal portions 16B may be provided.

[0061] When the target tape 11 is configured as described above and two knob portions 33 of the fastening tape 31 are provided side by side in the front-rear direction y, it can be stably fastened to the target tape 11 by cross-fastening. When the fastening tape 31 shown in FIG. 11 is fastened to the target tape 11 configured as such by cross-fastening, the hook member 37 of the front knob portion 34 of the first fastening tape 31A is fastened to at least the tip portion in the third region 21 of the target tape 11, and the hook member 37 of the front knob portion 34 of the second fastening tape 31B is preferably fastened to at least the tip portion in the fourth region 22 of the target tape 11. When the outer hook member 37O and the inner hook member 37I are provided as the hook member 37 in the front knob portion 34 as in the fastening tape 31 shown in the drawing, it is preferable that at least the outer hook member 37O is fastened to the third region 21 or the fourth region 22 of the target tape 11. When the two knob portions 33 provided side by side in the front-rear direction y of the fastening tape 31 are cross-fastened to the target tape 11, the front knob portion 34 is arranged on the target tape 11 so as to go from the outside in the width direction x to the inside and from below the wearer to above. Therefore, when the third region 21 and the fourth region 22 are formed in the target tape 11 as described above, the hook member 37 of the front knob portion 34 is likely to engage with the first diagonal portion 16A or the second diagonal portion 16B of the mesh structure 14 of the engaging layer 13 of the target tape 11.

[0062] Specifically, the hook member 37 of the front knob portion 34 of the first fastening tape 31A is likely to engage with the second diagonal portion 16B of the engaging layer 13 in the third region 21 of the target tape 11, and the hook member 37 of the front knob portion 34 of the second fastening tape 31B is likely to engage with the first diagonal portion 16A of the engaging layer 13 in the fourth region 22 of the target tape 11. As a result, when the front knob portion 34 is fastened to the target tape 11, it is less likely that the front knob portion 34 comes off the target tape 11 from the tip side.

[0063] Regarding the rear tab portion 35, it is preferable that the hook member 37 of the rear tab portion 35 of the first fastening tape 31A is fixed at least at its tip portion to the first region 19 of the target tape 11, and the hook member 37 of the rear tab portion 35 of the second fastening tape 31B is fixed at least at its tip portion to the second region 20 of the target tape 11. When, as shown in the fastening tape 31 in the drawings, the outer hook member 37O and the inner hook member 37I are provided as the hook members 37 on the rear tab portion 35, it is preferable that at least the outer hook member 37O is fixed to the first region 19 or the second region 20 of the target tape 11. When the fastening tape 31 is cross-fastened to the target tape 11, the rear tab portion 35 is arranged to face downward from above the wearer from the outside to the inside in the width direction x on the target tape 11. Therefore, by forming the first region 19 and the second region 20 on the target tape 11 as described above, the hook member 37 of the rear tab portion 35 can easily engage with the first diagonal portion 16A or the second diagonal portion 16B of the mesh structure 14 of the engagement layer 13 of the target tape 11.

[0064] Specifically, the hook member 37 of the rear tab portion 35 of the first fastening tape 31A can easily engage with the first diagonal portion 16A of the engagement layer 13 of the first region 19 of the target tape 11, and the hook member 37 of the rear tab portion 35 of the second fastening tape 31B can easily engage with the second diagonal portion 16B of the engagement layer 13 of the second region 20 of the target tape 11. As a result, when the rear tab portion 35 is fixed to the target tape 11 and the disposable diaper 1 is worn, it is less likely that the rear tab portion 35 will come off the target tape 11 from the tip side.

[0065] Therefore, as shown in FIG. 5, the target tape 11 is divided into four regions, i.e., a first region 19, a second region 20, a third region 21, and a fourth region 22, in the width direction x and the longitudinal direction y. The number of the first diagonal portions 16A is larger than the number of the second diagonal portions 16B in the first region 19 and the fourth region 22, and the number of the second diagonal portions 16B is larger than the number of the first diagonal portions 16A in the second region 20 and the third region 21. By this configuration, the fastening tape 31 can be stably fastened to the target tape 11 by cross-fastening.

[0066] When a plurality of regions are formed in the target tape 11 as described above, each region may be composed of a common base layer 12, or may be composed of separate base layers 12. Each region may be composed of a common engagement layer 13, or may be composed of separate engagement layers 13. The target tape 11 may be divided corresponding to each region.

[0067] In the target tape 11 of the first embodiment, it is preferable that the first region 17 and the second region 18 are divided by a center line in the width direction x (i.e., a center line extending in the longitudinal direction y). Similarly, in the target tape 11 of the second embodiment, it is preferable that the first region 19 and the second region 20 are divided by a center line in the width direction x, and it is preferable that the third region 21 and the fourth region 22 are divided by a center line in the width direction x (i.e., a center line extending in the longitudinal direction y). Thereby, the fastening tape 31 can be more reliably and stably fastened to the target tape 11.

[0068] In the first regions 17, 19 and the fourth region 22, both the first diagonal portions 16A and the second diagonal portions 16B may be present as long as the number of the first diagonal portions 16A is larger than the number of the second diagonal portions 16B. In these regions, the number of the first diagonal portions 16A is preferably 1.25 times or more, more preferably 1.5 times or more, and even more preferably 2 times or more the number of the second diagonal portions 16B. The second diagonal portions 16B may not be present in the first regions 17, 19 and the fourth region 22.

[0069] In the second regions 18 and 20 and the third region 21, if the number of the second diagonal portions 16B is larger than the number of the first diagonal portions 16A, both the first diagonal portions 16A and the second diagonal portions 16B may be present. In these regions, the number of the second diagonal portions 16B is preferably 1.25 times or more, more preferably 1.5 times or more, and still more preferably 2 times or more the number of the first diagonal portions 16A. The first diagonal portions 16A may not be present in the second regions 18 and 20 and the third region 21.

[0070] In an embodiment of the present invention, it is preferable that the yarns constituting the diagonal portion 16 connect two lattice points diagonally and extend in a slackened manner rather than extending straight between the two lattice points. Thereby, the hook member 37 can be easily engaged with the diagonal portion 16. For example, it is preferable that the yarns constituting the diagonal portion 16 extend in a slackened manner between two lattice points more than the yarns constituting the lattice portion 15. Specifically, when the length of the path along which the yarns constituting the diagonal portion 16 connect two lattice points is L1, the length of the straight line connecting the two lattice points is L2, the length of the path along which the yarns constituting the lattice portion 15 connect two lattice points is L3, and the length of the straight line connecting the two lattice points is L4, it is preferable that the value of L1 / L2 is larger than the value of L3 / L4.

[0071] When the two lattice points diagonally connected by the yarns constituting the diagonal portion 16 are connected by a straight line, the angle of the straight line is preferably 10° or more, more preferably 20° or more, and preferably 80° or less, more preferably 70° or less, clockwise or counterclockwise with respect to the straight line extending in the width direction x.

[0072] In the first diagonal portion 16A, it is preferable that the two lattice points diagonally connected by the yarns are two adjacent lattice points of two rectangular shapes. In the second diagonal portion 16B, it is preferable that the two lattice points diagonally connected by the yarns are two adjacent lattice points of two rectangular shapes. Thereby, the hook member 37 can be easily engaged with the first diagonal portion 16A or the second diagonal portion 16B.

[0073] When the fastening tape 31 has a front knob portion 34 and a rear knob portion 35 as in the disposable diaper 1 shown in the drawings, it is preferable that the hook members 37 provided at least on the rear knob portion 35 have the engaging elements 39 arranged side by side in the front-rear direction y. As described above, the fastening tape 31 having the front knob portion 34 and the rear knob portion 35 is suitable for cross-fastening. In particular, as shown in FIG. 11, after fastening the front knob portion 34 to the target tape 11, the rear knob portion 35 is fastened to the target tape 11 so as to cross and overlap the front knob portion 34, whereby the fit around the crotches of both legs of the wearer can be improved, and leakage of urine or the like from the crotch of the wearer can be effectively prevented.

[0074] Also, in order to increase the engaging force between the hook member 37 of the rear knob portion 35 and the target tape 11, it is preferable that the hook member 37 provided on the rear knob portion 35 has the engaging elements 39 arranged side by side in the front-rear direction y. By configuring the hook member 37 of the rear knob portion 35 in this way, the rear knob portion 35 can be more stably fastened to the target tape 11. Specifically, the hook member 37 of the rear knob portion 35 of the first fastening tape 31A is easily engaged by the first diagonal portion 16A of the engaging layer 13 in the first region 17 or the first region 19 of the target tape 11, and the hook member 37 of the rear knob portion 35 of the second fastening tape 31B is easily engaged by the second diagonal portion 16B of the engaging layer 13 in the second region 18 or the second region 20 of the target tape 11, and the fitting feeling when wearing the disposable diaper 1 is easily maintained. For the fastening tape 31, it is also preferable that the hook member 37 provided on the front knob portion 34 has the engaging elements 39 arranged side by side in the front-rear direction y.

[0075] When the rear knob portion 35 is overlapped on the front knob portion 34 and cross-fastened, as one embodiment, it is preferable that the rear knob portion 35 is provided with an outer hook member 37O and an inner hook member 37I as hook members 37 so that the rear knob portion 35 can be stably fastened to the target tape 11. In this case, the portion between the outer hook member 37O and the inner hook member 37I of the rear knob portion 35 is overlapped so as to cross the front knob portion 34, and the outer hook member 37O and the inner hook member 37I are fastened to the target tape 11, whereby the rear knob portion 35 can be stably fastened to the target tape 11.

[0076] When performing the cross-fastening of the fastening tape 31 as described above, it is preferable that the outer hook member 37O and the inner hook member 37I are fastened so as to straddle the tape base material 36 of the front knob portion 34 and the target tape 11 that are overlapped in a crossed manner. Thereby, the rear knob portion 35 can be stably overlapped on the front knob portion 34 and cross-fastened.

[0077] From the viewpoint of stably overlapping and cross-fastening the rear knob portion 35 on the front knob portion 34, as shown in FIG. 9, the height of the engaging element 39 provided in the region 40 along the inner edge in the width direction x of the outer hook member 37O of the rear knob portion 35 is higher than the height of the engaging element 39 provided in the region outside the width direction x thereof, and the height of the engaging element 39 provided in the region 41 along the outer edge in the width direction x of the inner hook member 37I of the rear knob portion 35 is higher than the height of the engaging element 39 provided in the region inside the width direction x thereof. It is preferably formed. By forming each hook member 37 in this way, the rear knob portion 35 is likely to engage on the front knob portion 34 and is stably fastened. Therefore, when wearing the disposable diaper 1, the fastening tape 31 can be stably cross-fastened on the target tape 11. Note that the hook member 37 of the front knob portion 34 may also be configured in this way.

[0078] As shown in FIG. 10, in the rear knob portion 35, for the outer hook member 37O, the size of the top of the engaging element 39 provided in the region 40 along the inner edge in the width direction x is larger than the size of the top of the engaging element 39 provided in the region outside in the width direction x. For the inner hook member 37I, it is also preferable that the size of the top of the engaging element 39 provided in the region 41 along the outer edge in the width direction x is larger than the size of the top of the engaging element 39 provided in the region inside in the width direction x. When each hook member 37 is formed in this way, the rear knob portion 35 can be easily engaged on the front knob portion 34 and can be stably fixed. Therefore, when wearing the disposable diaper 1, the fastening tape 31 can be stably cross-fastened on the target tape 11. Note that the hook member 37 of the front knob portion 34 may also be configured in this way.

Explanation of Signs

[0079] 1: Disposable Diaper 2: Diaper Body 3: Top Sheet 4: Back Sheet 5: Absorbent Body 6: Side Sheet 7: Rising Flap 8: Elastic Member for Rising 9: Elastic Member around Legs 10: Elastic Member for Waist 11: Target Tape 12: Base Layer 13: Engaging Layer 14: Mesh Structure 15: Lattice Portion 16: Diagonal Portion, 16A: First Diagonal Portion, 16B: Second Diagonal Portion 17, 19: First Region 18, 20: Second Region 21: Third Region 22: Fourth Region 31: Fastening Tape, 31A: First Fastening Tape, 31B: Second Fastening Tape 32: Tape Body Portion, 32A: First Tape Body Portion, 32B: Second Tape Body Portion 33: Knob part, 33A: First knob part, 33B: Second knob part 34: Front knob part 35: Rear knob part 36: Tape base material 37: Hook member, 37O: Outer hook member, 37I: Inner hook member 38: Base 39: Engaging element

Claims

1. A tape-type disposable diaper having a width direction and a front-rear direction, and fastening tapes provided on both sides in the width direction of the diaper body, wherein the fastening tape is provided with a hook member of a hook-and-loop fastener, and a target tape for engaging the hook member of the fastening tape when the diaper is worn is provided on the outer surface side of the diaper body, the target tape having a base layer and an engagement layer provided on the outer surface side of the base layer and having a network structure formed by yarns, the network structure including a lattice portion in which the yarns are arranged in a square lattice pattern and a diagonal portion in which the yarns are arranged so as to obliquely connect at least two lattice points of the square lattice, the target tape having two regions with respect to the width direction, a first region located on one side in the width direction and a second region located on the other side in the width direction, among the diagonal portions, those in which the yarns obliquely connect two lattice points from the rear side to the front side in the front-rear direction from one side to the other side in the width direction are defined as first diagonal portions, and those in which the yarns obliquely connect two lattice points from the rear side to the front side in the front-rear direction from the other side to the one side in the width direction are defined as second diagonal portions, and in the first region, the number of the first diagonal portions is larger than the number of the second diagonal portions, and in the second region, the number of the second diagonal portions is larger than the number of the first diagonal portions. A disposable diaper characterized by this.

2. The target tape further has a third region and a fourth region which are two more regions with respect to the front-rear direction, the first region located on one side in the width direction and on the rear side in the front-rear direction, the second region located on the other side in the width direction and on the rear side in the front-rear direction, the third region located on one side in the width direction and on the front side in the front-rear direction, and the fourth region located on the other side in the width direction and on the front side in the front-rear direction are arranged, The disposable diaper according to claim 1, wherein in the fourth region, the number of the first diagonal portions is larger than the number of the second diagonal portions, and in the third region, the number of the second diagonal portions is larger than the number of the first diagonal portions.

3. The fastening tapes disposed on both sides in the width direction of the diaper body include a first fastening tape having a first tape main body portion attached to one side of both sides in the width direction of the diaper body and a first knob portion extending from the first tape main body portion at least in one side in the width direction, and a second fastening tape having a second tape main body portion attached to the other side of both sides in the width direction of the diaper body and a second knob portion extending from the second tape main body portion at least in the other side in the width direction. The disposable diaper according to claim 1 or 2.

4. The first knob portion has a front knob portion and a rear knob portion that extend in the width direction from the first tape main body portion and are spaced apart in the front-rear direction. The second knob portion has a front knob portion and a rear knob portion that extend in the width direction from the second tape main body portion and are spaced apart in the front-rear direction. The hook members are respectively provided on the front knob portion and the rear knob portion. The hook member has a base and a plurality of engaging elements protruding from the base. The disposable diaper according to claim 3, wherein the hook member provided at least on the rear knob portion has the engaging elements arranged side by side in the front-rear direction.

5. On the rear knob portion, as the hook member, an outer hook member and an inner hook member that are spaced apart from the outer hook member in the width direction and are provided inward of the outer hook member in the width direction are provided. The outer hook member has a height of the engaging element provided in a region along the inner edge in the width direction that is higher than a height of the engaging element provided in a region outward of the outer hook member in the width direction. The disposable diaper according to claim 4, wherein the inner hook member has a height of the engaging element provided in a region along the outer edge in the width direction that is higher than a height of the engaging element provided in a region inward of the outer hook member in the width direction.

6. On the rear knob portion, as the hook member, an outer hook member and an inner hook member that are spaced apart from the outer hook member in the width direction and are provided inward of the outer hook member in the width direction are provided. The outer hook member has a size of the top of the engaging element provided in a region along the inner edge in the width direction that is larger than a size of the top of the engaging element provided in a region outward of the outer hook member in the width direction. The disposable diaper according to claim 4 or 5, wherein the size of the top of the engaging element provided in the region along the outer edge in the width direction of the inner hook member is larger than the size of the top of the engaging element provided in the region closer to the inner side in the width direction than that.

7. The disposable diaper according to any one of claims 3 to 6, wherein when the diaper is worn, the first knob portion of the first fastening tape is engaged with at least the first region, and the second knob portion of the second fastening tape is engaged with at least the second region.

8. The two lattice points diagonally connected by the yarn in the first diagonal portion are two adjacent square lattice points, and the two lattice points diagonally connected by the yarn in the second diagonal portion are two adjacent square lattice points, and each diagonal portion of the first diagonal portion and the second diagonal portion is such that the yarn is on a diagonal line in a predetermined direction in a quadrilateral composed of two adjacent squares in the width direction, on a diagonal line in a predetermined direction in a quadrilateral composed of two adjacent squares in the front-rear direction, or on a diagonal line in a predetermined direction in one square. The disposable diaper according to any one of claims 1 to 7.

9. The disposable diaper according to any one of claims 1 to 8, wherein the target tape has a first target tape and a second target tape, the first target tape is located on one side in the width direction as the first region, and the second target tape is located on the other side in the width direction as the second region.

Images