Tape-type disposable diapers

Abstract

To provide a tape-type disposable diaper including a gap formed between base material sheets divided at a position between adjacent locking parts and preventing interference of a base material sheet piece left between the divided base material sheets.SOLUTION: A fastening tape 20 provided on a back side 10X of a diaper body 10 to be fastened to an abdominal side 10Z includes: a base material sheet 21 having a fixed end 22 fixed to the diaper body 10 and a free end 23 on an opposite side of the fixed end 22; and a plurality of locking parts 24 formed on the free end 23 and arranged in parallel along a longitudinal direction D. The base material sheet 21 is folded back near the fixed end 22, where a joining area 25 extending from the free end 23 to the fixed end 22 is set between the adjacent locking parts 24, and the joining area 25 is joined to the diaper body 10 via a joining structure 26. A pair of break-line parts 27 enabling to tear the base material sheet 21 along the joining area 25 are formed on both sides of the joining area 25.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Conventionally, there are known tape-type disposable diapers that are attached by fastening fastening tapes on both sides of the dorsal side of the diaper body to the outer surface of the ventral side of the diaper body (see, for example, Patent Documents 1 and 2).

[0003] Here, Patent Document 1 describes a tape-type disposable diaper in which a linear tear section is formed between two engaging sections on the fastening tape, and the base sheet of the fastening tape can be separated by breaking the tear section. Patent Document 2 also describes a tape-type disposable diaper in which two tear lines are formed between two engaging sections on the fastening tape, and a tab is formed to connect the base ends of the two tear lines. In this case, the base sheet of the fastening tape can be separated at a position between the two engaging sections by breaking the two tear lines while gripping the tab. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-52937 [Patent Document 2] Patent No. 6052728 Summary of the Invention [Problem to be solved by the invention]

[0005] In the tape-type disposable diaper described in Patent Document 1, when the fastening tape is divided along the tear line, no gaps are formed between the divided base sheet pieces. Therefore, when cross-fastening is performed, in which one of the divided base sheet pieces is pulled upward to fasten and the other is pulled downward to fasten, the bases of the base sheet pieces interfere with each other, making it difficult to properly fasten the base sheet pieces.

[0006] Furthermore, in the tape-type disposable diaper described in Patent Document 2, a gap is created between the divided base sheet sections, the size of which is the distance between the two tear lines. However, the base sheet piece remaining between the two tear lines has only the tab portion fixed to the diaper body, and the rest of the base sheet piece hangs down. As a result, there is a risk that the base sheet piece remaining between the two tear lines will get in the way of the fastening portion when fastening.

[0007] The present invention has been made in light of the above-mentioned problems, and aims to provide a tape-type disposable diaper in which gaps are created between the divided base sheets at positions between adjacent locking portions, and in which the pieces of base sheet remaining between the divided base sheets do not get in the way. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a diaper body comprising a dorsal portion, a crotch portion, and a ventral portion which are integrally formed and connected in order in the front-to-rear direction; and a fastening tape provided on either side of one of the dorsal portion and the ventral portion, separable in the front-to-rear direction, and fastened to the other of the dorsal portion and the ventral portion when the diaper body is in use. The fastening tape comprises a base sheet having a fixed end fixed to the diaper body and a free end opposite the fixed end, and a plurality of fastening portions formed on the free end and arranged in parallel along the front-to-rear direction. The base sheet is folded back near the fixed end, and a joining region extending from the free end to the fixed end is defined between adjacent fastening portions in the front-to-rear direction. The joining region is joined to the diaper body via a joining structure, and a pair of tearing portions are formed on both sides of the joining region to allow the base sheet to be torn along the joining region. [Effects of the Invention]

[0009] As a result, the tape-type disposable diaper of the present invention creates gaps between the divided base sheets at positions between adjacent fastening portions, and the pieces of base sheet remaining between the divided base sheets do not get in the way. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a partially cutaway development view showing a tape-type disposable diaper of Example 1. FIG. [Figure 2] 1 is a perspective view showing a state in which the tape-type disposable diaper of Example 1 is worn. FIG. [Figure 3] FIG. 2 is an enlarged view of part A in FIG. [Figure 4] FIG. 2 is an explanatory view showing a state in which one of the breaking portions formed in the fastening tape of Example 1 has been broken. [Figure 5] 10 is an explanatory view showing the state in which the other breaking portion formed in the fastening tape of Example 1 has been broken. FIG. [Figure 6] FIG. 10 is an enlarged view of a main part showing a fastening tape of a first modified example. [Figure 7]FIG. 10 is an enlarged view of a main part showing a fastening tape of a second modified example. [Figure 8] FIG. 10 is an enlarged view of a main part showing a fastening tape of a third modified example. [Figure 9] FIG. 10 is an enlarged view of a main part showing a fastening tape of a fourth modified example. [Figure 10] FIG. 10 is an enlarged view of a main part showing a fastening tape of a fifth modified example. [Figure 11] FIG. 10 is an enlarged view of a main part showing a fastening tape of a sixth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape-type disposable diaper according to the present invention will be described below with reference to a first embodiment shown in the drawings.

[0012] As shown in Fig. 1, the tape-type disposable diaper 1 of Example 1 comprises a diaper body 10 having a back portion 10X, a crotch portion 10Y, and a ventral portion 10Z, and a fastening tape 20 provided on the diaper body 10. When the tape-type disposable diaper 1 of Example 1 is used as shown in Fig. 2, the diaper body 10 covers the wearer P from the back through the crotch to the ventral portion 10Z, and the fastening tape 20 is fastened to the target sheet 16 to fasten both sides of the back portion 10X to the ventral portion 10Z. The tape-type disposable diaper 1 may be used with an inner pad set inside.

[0013] In the following description, the direction in which the back portion 10X, the crotch portion 10Y, and the abdominal portion 10Z of the tape-type disposable diaper 1 are connected in this order is referred to as the front-to-back direction D, and the direction perpendicular to the front-to-back direction D is referred to as the width direction E. The front-to-back direction D is the direction in which the diaper body 10 extends, with the front side corresponding to the abdominal side of the wearer P and the rear side corresponding to the back side of the wearer P. Furthermore, terms such as "upper and lower" and "inner and outer" are used based on the wearer P of the tape-type disposable diaper 1.

[0014] As shown in FIG. 1 , the diaper body 10 of Example 1 is formed by integrally connecting a dorsal portion 10X, a ventral portion 10Z, and a crotch portion 10Y between the dorsal portion 10X and the ventral portion 10Z. There is no boundary or structural difference between the dorsal portion 10X and the crotch portion 10Y, or between the ventral portion 10Z and the crotch portion 10Y. The diaper body 10 includes a top sheet 11, a back sheet 12, an absorbent body 13, and a gathered sheet 14. The diaper body 10 is formed by laminating the absorbent body 13 between the top sheet 11 and the back sheet 12, and then layering the gathered sheet 14 on the top sheet 11, with at least an appropriate region including the peripheral edge fixed by adhesive such as hot melt or welding.

[0015] The top sheet 11 is a sheet material placed on the body side (inside) of the wearer P. The top sheet 11 has liquid permeability, which is the property of allowing liquid to pass through, and is made of, for example, a liquid-permeable nonwoven fabric. The top sheet 11 allows bodily fluids to pass through quickly toward the absorbent body 13.

[0016] The backsheet 12 is a sheet material placed on the clothing side (outside) facing the topsheet 11. The backsheet 12 is liquid-impermeable, meaning it does not allow liquid to pass through, and is made of, for example, a resin film. The backsheet 12 prevents the body fluids held by the absorbent body 13 from passing through, preventing the clothing and other items from getting wet.

[0017] The absorbent body 13 is a liquid absorbent material laminated between the top sheet 11 and the back sheet 12. The absorbent body 13 contains absorbent polymer particles and pulp fibers, and may be wrapped in a core wrap sheet (not shown) made of crepe paper, nonwoven fabric, or the like. The absorbent body 13 has a smaller outer shape than the top sheet 11 and the back sheet 12. The absorbent body 13 may be single-layered or multi-layered.

[0018] The gathered sheets 14 are elongated sheet materials that are disposed on both sides of the absorbent body 13 in the width direction E and are fixed to the inside of the top sheet 11, extending in the front-to-rear direction D. The gathered sheets 14 are formed, for example, from a water-repellent or liquid-impermeable nonwoven fabric. One end of the gathered sheet 14 in the width direction E is fixed to the top sheet 11 by, for example, an adhesive such as a hot melt or by welding. At the other end of the gathered sheet 14 in the width direction E, a plurality of first elastic and stretchable members 15a are provided in a predetermined stretched state, extending in the front-to-rear direction D and arranged in parallel in the width direction E. The first elastic and stretchable members 15a are formed, for example, from thread-like or strip-like synthetic rubber. The gathered sheet 14 stretches and contracts due to the stretching force of the first elastic and stretchable members 15a, preventing side leakage of the wearer P's body waste.

[0019] Furthermore, in the region surrounding the legs of the wearer P when worn, a plurality of second elastic stretchable members 15b are provided in a predetermined stretched state, extending in the front-to-rear direction D and arranged in parallel in the width direction E. The second elastic stretchable members 15b are made of, for example, thread-like or strip-like synthetic rubber. The second elastic stretchable members 15b are positioned outward in the width direction E from the first elastic stretchable members 15a and extend along the side edges of the diaper main body 10. The backsheet 12 stretches due to the stretching force of the second elastic stretchable members 15b, improving the fit of the diaper main body 10 around the legs of the wearer P.

[0020] A target sheet 16 is provided on the garment-facing surface of the back sheet 12 of the abdominal portion 10Z of the diaper main body 10. The target sheet 16 is a sheet that releasably fastens the fastening member 24b of the fastening tape 20. For example, if the fastening member 24b is a hook tape with fastening protrusions, the target sheet 16 may have a surface on which a large number of loop threads are provided so that the hook tape can be entangled. For example, if the fastening member 24b is an adhesive material, the target sheet 16 may have a smooth surface that has been subjected to a release treatment. Note that if the garment-facing surface of the back sheet 12 is made of nonwoven fabric, the fastening member 24b may be made of hook tape, and the target sheet 16 may be omitted. In this case, the fastening tape 20 is fastened by entangling the fastening member 24b made of hook tape with the fibers of the back sheet 12.

[0021] As shown in Fig. 1, the fastening tapes 20 are provided on both sides of the diaper body 10 in the width direction E in the back side portion 10X of the diaper body 10. The fastening tapes 20 have a base sheet 21 and a plurality of (here, two) engaging portions 24.

[0022] The base sheet 21 is a sheet material made of, for example, nonwoven fabric, plastic film, polylaminated nonwoven fabric whose surface is covered with a thin polyethylene film, paper, or a composite material thereof. To prevent unnecessary tearing or stretching during use, the base sheet 21 is made of a material with a higher basis weight than the top sheet 11, the back sheet 12, etc. Therefore, the tear strength of the general portion of the base sheet 21 is higher than the tear strength of the top sheet 11, the back sheet 12, etc. Here, the "general portion of the base sheet 21" refers to an area of ​​the base sheet 21 where a rupture portion 27, described below, is not formed. Furthermore, the "tear strength" includes at least one of the strength against a force pulling the base sheet 21 in opposite directions along a direction parallel to the sheet surface and the strength against a force pulling the base sheet 21 in opposite directions along a direction perpendicular to the sheet surface.

[0023] The base sheet 21 has a fixed end 22 fixed to the diaper body 10 and a free end 23 opposite the fixed end 22. The fixed end 22 is sandwiched between the gathered sheet 14 and the back sheet 12 and is fixed to the diaper body 10 by, for example, an adhesive such as a hot melt or by welding. The free end 23 faces outward in the width direction E from the diaper body 10.

[0024] The multiple (two) locking portions 24 are formed on the free end 23 of the base sheet 21 and are arranged side by side in the front-to-rear direction D. Each locking portion 24 has a flap portion 24a that protrudes further outward in the width direction E from the free end 23, and a locking member 24b provided on the flap portion 24a.

[0025] The flap portion 24 a is formed by a part of the base sheet 21 .

[0026] The fastening material 24b is provided on the inner surface of the flap portion 24a, and may be, for example, a hook tape of a mechanical fastener (hook and loop fastener), an adhesive material, etc. The inner surface of the flap portion 24a is the surface that faces the target sheet 16 when the tape-type disposable diaper 1 is in use. The fastening material 24b may be of any material or shape as long as it can be repeatedly fastened to and peeled from the target sheet 16.

[0027] In the fastening tape 20 of the tape-type disposable diaper 1 of Example 1, when the diaper body 10 is unused, the base sheet 21 is folded back toward the inside of the diaper body 10 near the fixed end 22. The base sheet 21 also has a joining region 25 located between adjacent fastening portions 24 in the front-to-rear direction D, as shown by the dashed-dotted line in Fig. 3. Of the fastening tapes 20 provided on both sides of the diaper body 10, Fig. 3 only shows the one on the right side in Fig. 1, but the other fastening tape 20 shown on the left side in Fig. 1 has the same configuration.

[0028] The joining region 25 of Example 1 is located in the center of the base sheet 21 in the front-to-rear direction D, and is a region extending in the width direction E from the free end 23 to the fixed end 22. The joining region 25 of Example 1 has a constant width in the front-to-rear direction D from the free end 23 to the fixed end 22. The joining region 25 is joined to the diaper body 10 via a joining structure 26 (shown with diagonal lines in FIG. 3). The joining structure 26 is a structure that joins the base sheet 21 to the diaper body 10 by ultrasonic bonding, fusion bonding, or the like. The joining structure 26 of Example 1 uniformly joins almost the entire surface of the joining region 25 to the diaper body 10.

[0029] Furthermore, a pair of breaks 27 are formed in the base sheet 21 on both sides of the joining region 25 in the front-rear direction D. The breaks 27 are arranged intermittently at regular intervals along the extension direction (width direction E) of the joining region 25 and are composed of a plurality of through holes 27a penetrating the base sheet 21. Here, the "through holes" include holes (openings) with an opening area and slits (slits) without an opening area, and can be set to any shape such as a circular or elongated elliptical hole, or a linear slit. The through holes 27a in Example 1 are set to be linear slit-shaped having a predetermined length along the width direction E.

[0030] The base sheet 21 is then torn along the joining region 25 by breaking the uncut portions between the plurality of through holes 27a that make up the breaking portion 27. That is, as shown in FIG. 4, when the base sheet 21 is torn at one breaking portion 27 formed on the ventral side of the joining region 25, a part of the base sheet 21 unfolds to form the first tape 20a. Also, as shown in FIG. 5, when the base sheet 21 is torn at the other breaking portion 27 formed on the dorsal side of the joining region 25, a part of the base sheet 21 unfolds to form the second tape 20b. In this way, the base sheet 21 can be divided in the front-rear direction D by providing the breaking portion 27.

[0031] Furthermore, the bonding region 25 set on the base sheet 21 remains bonded to the diaper body 10 even when part of the base sheet 21 unfolds to form the first tape 20a and the second tape 20b (see FIG. 5). As a result, a gap S is formed in the front-to-rear direction D between the first tape 20a and the second tape 20b.

[0032] Next, the operation of the tape-type disposable diaper 1 of the first embodiment will be described.

[0033] When using the tape-type disposable diaper 1 of Example 1, the caregiver first unfolds the diaper body 10 as shown in Fig. 1. At this time, the base sheet 21 of the fastening tape 20 is folded back at the fixed end 22 toward the diaper body 10, and the bonding region 25 is bonded to the diaper body 10 via the bonding structure 26.

[0034] Next, the caregiver places the diaper body 10 in a predetermined position (for example, under the wearer P who is lying on his / her back) and unfolds the fastening tape 20. That is, the caregiver grasps one of the fastening portions 24 located on the ventral side of the joining region 25 and pulls the base sheet 21 outward in the width direction E. This causes the base sheet 21 to break at one of the breaking portions 27 formed on the ventral side of the joining region 25. The base sheet 21 is then broken along the joining region 25, and a portion of the base sheet 21 is unfolded to form the first tape 20a (see FIG. 4).

[0035] Next, the caregiver grasps the other engaging portion 24 located on the rear side of the joining region 25 and pulls the base sheet 21 outward in the width direction E. This causes the base sheet 21 to break at the other breaking portion 27 formed on the rear side of the joining region 25. The base sheet 21 is then broken along the joining region 25, and a portion of the base sheet 21 is unfolded to form the second tape 20b (see FIG. 5).

[0036] That is, the fastening tape 20 is unfolded and simultaneously forms the first tape 20a or the second tape 20b, and as a result is divided into two in the front-rear direction D.

[0037] The caregiver then covers the lower abdomen of the wearer P with the diaper body 10 and fastens the fastening portions 24 of the fastening tapes 20 to the target sheet 16 to sew together the dorsal portion 10X and the abdominal portion 10Z. At this time, the fastening tapes 20 are, for example, cross-fastened (see FIG. 2). The "cross-fastening" method refers to fastening the free end 23 of the first tape 20a to the target sheet 16 in a state where it is pulled upward, and fastening the free end 23 of the second tape 20b to the target sheet 16 in a state where it is pulled downward, so that the first tape 20a and the second tape 20b cross each other in a substantially X-shape on the target sheet 16. Note that when fastening the fastening tapes 20 to the target sheet 16, the caregiver can adjust the size of the diaper body 10 to fit the physique of the wearer P by adjusting the fastening method.

[0038] As described above, in the tape-type disposable diaper 1 of Example 1, the base sheet 21 of the fastening tape 20 is folded back at the fixed end 22, and the joining region 25 set between the locking portions 24 adjacent to each other in the front-rear direction D is joined to the diaper body 10 via the joining structure 26. In addition, a pair of breaking portions 27 are formed on both sides of the joining region 25 in the front-rear direction D, allowing the base sheet 21 to be broken along the joining region 25.

[0039] For this reason, when the fastening tape 20 is unfolded, the base sheet 21 is torn at the tearing portion 27 and divided into two pieces, the first tape 20a and the second tape 20b, in the front-to-back direction D, with the joining region 25 set between the fastening portions 24 sandwiched between them. At this time, the joining region 25 remains joined to the diaper body 10 by the joining structure 26. As a result, a gap S is created in the front-to-back direction D between the first tape 20a and the second tape 20b, the size of which is the joining region 25. As a result, the tape-type disposable diaper 1 of Example 1 can create a gap S between the base sheet 21 (the first tape 20a and the second tape 20b) divided at a position between the adjacent fastening portions 24 in the front-to-back direction D.

[0040] Furthermore, the gap S formed between the divided base sheet 21 (first tape 20a and second tape 20b) makes it less likely that the base portion (fixed end 22) of the first tape 20a and the base portion (fixed end 22) of the second tape 20b will interfere with each other when cross-fastening the fastening tape 20. This allows the caregiver to easily perform cross-fastening and appropriately prevents gaps from forming around the legs of the wearer P.

[0041] Furthermore, the caregiver can grasp the engaging portion 24 to unfold the fastening tape 20 and simultaneously tear the base sheet 21 from the tearing portion 27. Therefore, the tape-type disposable diaper 1 of Example 1 can reduce the caregiver's workload compared to a tape-type diaper in which the fastening tape 20 adhered to the diaper body 10 with, for example, a temporary adhesive is peeled off, unfolded, and then torn from perforations provided in the base sheet.

[0042] Furthermore, in the tape-type disposable diaper 1 of Example 1, even when the first tape 20a and the second tape 20b are unfolded, the joining region 25 remains joined to the diaper body 10. Therefore, the joining region 25 (base sheet piece) remaining between the divided base sheet 21 (first tape 20a and second tape 20b) is fixed to the diaper body 10 in its entirety and does not get in the way when the fastening portion 24 is fastened.

[0043] In the tape-type disposable diaper 1 of Example 1, the fastening tape 20 is separated into two pieces during use, so the first tape 20a and the second tape 20b can be formed from a single base sheet 21. This makes it possible for the tape-type disposable diaper 1 of Example 1 to prevent deterioration in operability when manufacturing the diaper body 10.

[0044] Furthermore, in the tape-type disposable diaper 1 of Example 1, the base sheet 21 folded back toward the diaper body 10 is joined to the diaper body 10 by a joining structure 26. Therefore, the tape-type disposable diaper 1 of Example 1 does not require adhesive to temporarily fasten the folded back fastening tape 20.

[0045] The above has described the tape-type disposable diaper of the present invention based on Example 1, but the specific configuration is not limited to Example 1, and design changes and additions are permitted as long as they do not deviate from the gist of the invention according to each claim.

[0046] In the tape-type disposable diaper 1 of Example 1, the joining structure 26 is uniformly joined to the diaper body 10 over almost the entire joining region 25. However, as in the fastening tape 20A of the first modified example shown in Fig. 6, the joining structure 26A may be composed of a plurality of joining portions 28 arranged intermittently along the extending direction (width direction E) of the joining region 25A.

[0047] Here, the bonding portion 28 is a portion where the base sheet 21, adhesive, etc. are bonded together with the diaper body 10. That is, in the tape-type disposable diaper 1 of Example 1, the entire bonding area 25 is a bonding portion. The bonding portion 28 is harder than the general portion of the base sheet 21.

[0048] In contrast, in the fastening tape 20A of the first modified example, the area of ​​the bonded portion 28 is smaller than in the fastening tape 20 of Example 1, in which the entire surface of the bonded region 25 is uniformly bonded by the bonded structure 26, and the bonded region 25A can be made softer. This allows the bonded region 25A of the fastening tape 20A of the first modified example to feel soft against the skin.

[0049] 6, multiple joints 28 of the same size are arranged at regular intervals. However, the size of each joint 28 can be set arbitrarily, and joints 28 of different sizes may be arranged. Furthermore, the intervals between joints 28 may be unequal.

[0050] Furthermore, in the tape-type disposable diaper 1 of Example 1, the width α of the joining region 25 in the front-to-rear direction D is constant from the free end 23 to the fixed end 22. However, as in the fastening tape 20B of the second modified example shown in FIG. 7 and the fastening tape 20C of the third modified example shown in FIG. 8, the width α of the joining region 25B in the front-to-rear direction D may gradually increase from the free end 23 to the fixed end 22 of the base sheet 21. In the fastening tape 20B of the second modified example, the joining structure 26B joins only both ends of the joining region 25B in the front-to-rear direction D to the diaper body 10 (see FIG. 7). In the fastening tape 20C of the third modified example, the joining structure 26B joins the entire joining region 25B uniformly to the diaper body 10 (see FIG. 8).

[0051] In the fastening tape 20B of the second modified example and the fastening tape 20C of the third modified example, when the base sheet 21 is divided into two in the front-to-rear direction D, the width of the gap S generated between the divided base sheet 21 (first tape 20a and second tape 20b) in the front-to-rear direction D can be widened toward the base (fixed end 22). This makes it possible for the fastening tape 20B of the second modified example and the fastening tape 20C of the third modified example to cause even less interference between the base (fixed end 22) of the first tape 20a and the base (fixed end 22) of the second tape 20b than in Example 1.

[0052] Furthermore, the area where the joining structure 26B is provided is smaller in the fastening tape 20B of the second modification than in the fastening tape 20C of the third modification, so the fastening tape 20B of the second modification can have a softer joining region 25B than the fastening tape 20C of the third modification.

[0053] In the fastening tape 20B of the second modification, the joining structure 26B linearly joins both ends of the joining region 25B in the front-to-rear direction D. In the fastening tape 20C of the third modification, the entire surface of the joining region 25B is uniformly joined by the joining structure 26B. However, in either the fastening tape 20B of the second modification or the fastening tape 20C of the third modification, the joining structure 26B may be composed of a plurality of joining portions arranged intermittently along the extension direction (width direction E) of the joining region 25B.

[0054] Furthermore, in the tape-type disposable diaper 1 of Example 1, the plurality of through holes 27a constituting the tearing portion 27 are set as linear cuts having a predetermined length along the width direction E. Here, in Example 1, the extending direction of each through hole 27a is set parallel to the extending direction (width direction E) of the bonding region 25. However, the extending direction of each through hole 27a can be set arbitrarily as long as the base sheet 21 does not tear in the front-rear direction D (so-called horizontal tearing) when the uncut portion between the through holes 27a constituting the tearing portion 27 is torn.

[0055] That is, when the breaking portion 27 is formed by a plurality of elongated through holes 29a arranged intermittently along the extension direction (width direction E) of the joining region 25D as in the fastening tape 20D of the fourth modified example shown in FIG. 9, each through hole 29a may be set so that the length L2 along the front-rear direction D from the second end 30b to the joining region 25D is shorter than the length L1 along the front-rear direction D from the first end 30a to the joining region 25D. Note that the "first end 30a" refers to one of both longitudinal end portions of each through hole 29a that is closer to the free end 23. The "second end 30b" refers to the other of both longitudinal end portions of each through hole 29a that is closer to the fixed end 22.

[0056] In this case, when the fastening tape 20D is unfolded, the tearing direction of the base sheet 21 can be guided toward the joining region 25D by the plurality of through holes 29a. Therefore, the fastening tape 20D of the fourth modification can prevent the base sheet 21 from tearing in the front-rear direction D.

[0057] Furthermore, in the tape-type disposable diaper 1 of Example 1, the base sheet 21 is joined to the diaper body 10 only at the joining region 25 set between the two fastening portions 24. However, as in a fastening tape 20E of a fifth modified example shown in Fig. 10, second joining regions 31 extending from the free end 23 to the fixed end 22 may be set at both ends of the base sheet 21E in the front-to-rear direction D, and each second joining region 31 may be joined to the diaper body 10 via a second joining structure 32. In Fig. 10, the second joining region is shown surrounded by a dashed line, and the second joining structure 32 is shown with diagonal lines.

[0058] Furthermore, in the fastening tape 20E of the fifth modification, a second breaking portion 33 that can break the base sheet 21 along the second joining region 31 is formed at a position more inward in the front-rear direction D than the second joining region 31. The second breaking portion 33 is composed of a plurality of through holes that are arranged at regular intervals along the width direction E.

[0059] As a result, both ends of the fastening tape 20E of the fifth modified example in the front-rear direction D are fixed to the diaper body 10. Therefore, when the fastening tape 20E of the fifth modified example is unfolded, the direction of the force acting on the uncut portions between the plurality of through holes 27a that make up the tearing section 27 can be aligned with the extension direction of the joining region 25 (width direction E), allowing the uncut portions to be neatly torn.

[0060] Furthermore, in the tape-type disposable diaper 1 of Example 1, the breaking portion 27 is configured by a plurality of through holes 27a penetrating the base sheet 21. However, the configuration of the breaking portion 27 is not limited to this. For example, as in the fastening tape 20F of the sixth modified example shown in Fig. 11, the breaking portion 34 may be configured by a plurality of fused portions 34a arranged intermittently at regular intervals along the extension direction (width direction E) of the bonding region 25.

[0061] 11, the bonding structure 26F is composed of a plurality of bonding portions 28F arranged intermittently along the extending direction (width direction E) of the bonding region 25F. However, even when the breaking portion 34 is composed of a plurality of fused portions 34a, the entire surface of the bonding region 25F may be uniformly bonded by the bonding structure 26F.

[0062] Furthermore, in the tape-type disposable diaper 1 of Example 1, an example has been shown in which the fastening tape 20 has two locking portions 24 arranged side by side in the front-to-rear direction D. However, the number of locking portions 24 may be two or more. Furthermore, when three or more locking portions 24 are provided, the fastening tape 20 can be divided into three or more parts in the front-to-rear direction D.

[0063] In the tape-type disposable diaper 1 of Example 1, the fastening tapes 20 are provided on both sides of the dorsal portion 10X of the diaper body 10 and fastened to the ventral portion 10Z. However, the fastening tapes 20 may be provided on both sides of the ventral portion 10Z of the diaper body 10 and fastened to the dorsal portion 10X. [Explanation of symbols]

[0064] 1. Tape-type disposable diapers 10 Diaper body 10X dorsal part 10Z ventral part 20 Fastening Tape 21 Base sheet 22 Fixed end 23 Free end 24 Locking part 25 Joint area 26 Joint structure 27 Breaking part D Anteroposterior direction

Claims

1. a diaper body having a back portion, a crotch portion, and a ventral portion that are integrally formed in a manner that the back portion, the crotch portion, and the ventral portion are connected in order in the front-to-rear direction; a fastening tape provided on both sides of one of the back side portion and the abdominal side portion, separable in the front-rear direction, and fastened to the other of the back side portion and the abdominal side portion when the diaper main body is in use; The fastening tape includes a base sheet having a fixed end fixed to the diaper body and a free end opposite to the fixed end, and a plurality of engaging portions formed at the free end and arranged in parallel along the front-rear direction, the base sheet is folded back at a position near the fixed end, and a joining region extending from the free end to the fixed end is defined between the locking portions adjacent to each other in the front-rear direction; The joining region is joined to the diaper main body via a joining structure, A pair of tearing portions that can tear the base sheet along the joining area are formed on both sides of the joining area. A tape-type disposable diaper characterized by:

2. In the tape-type disposable diaper according to claim 1, The joint structure is composed of a plurality of joints arranged intermittently along the extending direction of the joint region. A tape-type disposable diaper characterized by:

3. In the tape-type disposable diaper according to claim 1 or 2, The width of the joining region in the front-rear direction gradually increases from the free end of the base sheet toward the fixed end. A tape-type disposable diaper characterized by:

4. In the tape-type disposable diaper according to claim 1 or 2, the breaking portions are arranged intermittently along the extending direction of the joining region and are constituted by a plurality of elongated through holes penetrating the base sheet, When one end of the through hole in the longitudinal direction that is closer to the free end is defined as a first end, and the other end of the through hole in the longitudinal direction that is closer to the fixed end is defined as a second end, The through hole is formed such that the length from the second end to the joining region in the front-rear direction is shorter than the length from the first end to the joining region in the front-rear direction. A tape-type disposable diaper characterized by:

5. In the tape-type disposable diaper according to claim 1 or 2, The base sheet has second joining regions at both ends in the front-rear direction, the second joining regions extending from the free ends to the fixed ends, and the second joining regions are joined to the diaper main body via second joining structures; A second breaking portion capable of breaking the base sheet along the second joining region is formed at a position inside the second joining region in the front-rear direction. A tape-type disposable diaper characterized by:

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