DIAPERS FOR PETS

Abstract

The invention proposes a pet diaper (1) consisting of a main body (2) with a first plate (31) made of nonwoven fabric positioned in the position facing the pet's skin when worn, a bottom plate (4), and an absorbent core (11). The bottom plate (4) has an outer plate (41) made of nonwoven fabric forming the outermost surface of the main body (2), and a leak-proof plate (42) positioned between the outer plate (41) and the absorbent core (11). The main body (2) is provided with a tail insert (6). The tail insert (6) has a cut (6a) formed by cutting the main body (2) in the thickness direction Z, and the cut (6b) is provided separately from the cut (6a). In the boundary region (B) between the cut section (6a) and the cut section (6b) of the main body (2), at least one opening (31a, 41a) is provided on at least one of the first plate (31) and the outer plate (41).

Description

Pet diapers

[0001] The present disclosure relates to pet diapers.

[0002] Conventionally, pet diapers for pets such as dogs and cats have been known. For example, Patent Document 1 discloses a pet diaper that has a tail insertion section (slit) for inserting the pet's tail in a portion behind the absorbent core. In the pet diaper disclosed in Patent Document 1, the tail insertion section is configured with a plurality of cut sections (slits) arranged at a distance from each other, allowing the size of the tail insertion hole to be adjusted.

[0003] Japanese Patent Application Laid-Open No. 2012-205542

[0004] When the size-adjustable tail insertion section is made up of multiple cut sections as disclosed in Patent Document 1, it may be necessary to tear the sections between the multiple cut sections (boundaries) in the main body of the pet diaper in order to connect the multiple cut sections to form a tail insertion hole of a predetermined size. If a strong force is required for this tearing process, not only will it be inconvenient for the user performing the tearing process, but there is also a risk that the main body will tear in a direction different from the originally intended tearing direction.

[0005] Therefore, one aspect of the present disclosure aims to provide a pet diaper that is configured so that a tail insertion hole of a predetermined size can be formed by connecting multiple cut sections, and in which the tearing process for connecting the multiple cut sections can be performed easily and accurately.

[0006] A pet diaper according to one aspect of the present disclosure is a pet diaper to be put on a pet, and comprises a main body having a top sheet made of nonwoven fabric that is positioned facing the pet's skin when the pet diaper is put on the pet, a back sheet that is positioned on the side opposite the pet's skin when the pet diaper is put on the pet, and an absorbent core that is positioned between the top sheet and the back sheet, and the back sheet has an outer sheet made of nonwoven fabric that forms the outermost surface of the main body, and an inner sheet that is positioned between the outer sheet and the absorbent core, and the main body is provided with a tail insertion section for inserting the pet's tail, and the tail insertion section has a first cut section formed by cutting the main body in the thickness direction, which is the stacking direction of the sheets that make up the main body, and a second cut section that is provided separately from the first cut section, and in the boundary region between the first cut section and the second cut section of the main body, at least one of the top sheet and the outer sheet is provided with at least one opening that penetrates in the thickness direction and has a predetermined area.

[0007] According to the present disclosure, it is possible to provide a pet diaper that is configured so that a tail insertion hole of a predetermined size can be formed by connecting multiple cut sections, and in which the tearing process for connecting the multiple cut sections can be performed easily and accurately.

[0008] FIG. 1 is a plan view of a pet diaper according to one embodiment, as seen from the skin side; FIG. 2 is a plan view of the pet diaper of FIG. 1, as seen from the non-skin side; FIG. 3 is a cross-sectional view of the pet diaper taken along line III-III in FIG. 1; FIG. 4 is a cross-sectional view of the pet diaper taken along line IV-IV in FIG. 1; FIG. 5 is a diagram showing an example of a state in which the pet diaper is worn; FIG. 6 is an enlarged view of the first sheet, as seen from the skin side; FIG. 7 is an enlarged view of the outer sheet, as seen from the non-skin side; FIG. 8 is an enlarged view of a portion including a boundary region of a main body portion, as seen from the skin side; FIG. 9 is a diagram schematically showing an example of a hot melt adhesive applied to each of the first sheet and the outer sheet; and FIG. 11 is an enlarged view of a portion including a boundary region of a main body portion according to a modified example, as seen from the skin side.

[0009] At least the following aspects 1 to 10 will become apparent from the description of this specification and the accompanying drawings.

[0010] (Mode 1) A pet diaper to be put on a pet, comprising: a main body having a top sheet made of nonwoven fabric that is positioned facing the pet's skin when the pet diaper is put on the pet; a back sheet that is positioned on the side opposite the pet's skin when the pet diaper is put on the pet; and an absorbent core that is positioned between the top sheet and the back sheet, wherein the back sheet has an outer sheet made of nonwoven fabric that forms the outermost surface of the main body, and an inner sheet that is positioned between the outer sheet and the absorbent core, the main body having a tail insertion portion for inserting the pet's tail, the tail insertion portion having a first cut portion formed by cutting the main body in the thickness direction, which is the stacking direction of the sheets that make up the main body, and a second cut portion that is positioned separate from the first cut portion, and at least one of the top sheet and the outer sheet has at least one opening that penetrates in the thickness direction and has a predetermined area, in the boundary region between the first cut portion and the second cut portion of the main body.

[0011] In the above-mentioned pet diaper, the tail insertion portion has a first cut portion and a second cut portion that are provided separately from each other. That is, by connecting the first cut portion and the second cut portion, a tail insertion hole of a predetermined size can be formed. Furthermore, an opening is provided in at least one of the top sheet and the outer sheet that constitute the main body portion in the boundary region between the first cut portion and the second cut portion. By providing such an opening in the boundary region, the portion of the main body corresponding to the boundary region can be easily torn. Furthermore, since the portion of the main body corresponding to the boundary region is easily torn, the main body portion is prevented from tearing in an unexpected direction when a user attempts to tear the portion to connect the first cut portion and the second cut portion when using the pet diaper. Therefore, with the above-mentioned pet diaper, the tearing process for connecting the multiple cut portions can be performed easily and accurately.

[0012] (Aspect 2) The pet diaper of aspect 1, wherein the width of the opening is smaller than the shortest distance between the first cut portion and the second cut portion.

[0013] According to aspect 2, when the pet diaper is in a pre-use state, the first cut portion and the second cut portion are prevented from connecting through the opening, and the first cut portion and the second cut portion can be properly maintained in a separated state.

[0014] (Aspect 3) The pet diaper of aspect 2, wherein the width of the opening is equal to or less than half of the shortest distance.

[0015] According to aspect 3, the first cut portion and the second cut portion can be more preferably maintained in a separated state before the pet diaper is used, and unintentional tearing of the portion corresponding to the boundary region of the main body portion (the portion between the first cut portion and the second cut portion) can be prevented.

[0016] (Aspect 4) The pet diaper according to aspect 3, wherein the shortest distance is 3 mm or more and 5 mm or less.

[0017] By setting the shortest distance between the first cutting portion and the second cutting portion to 3 mm or more, it is possible to effectively prevent the portion corresponding to the boundary region of the main body from being unintentionally torn, and by keeping the shortest distance to 5 mm or less, it is possible to prevent the portion corresponding to the boundary region of the main body from being difficult to torn.

[0018] (Aspect 5) The pet diaper of any one of Aspects 1 to 4, wherein the at least one opening includes a plurality of openings arranged in a regular pattern, and the width of the linear hot melt adhesive adhered to an area including the tail insertion section of at least one of the top sheet and the outer sheet in which the plurality of openings are provided is greater than the width of the opening and smaller than the distance between the centers of two adjacent openings.

[0019] According to aspect 5, it is possible to effectively suppress delamination of the main body portion at the tail insertion portion while preventing the hot melt adhesive from seeping out from the opening.

[0020] (Aspect 6) The moisture permeability of the inner sheet is 500 g / (m ２ The pet diaper according to any one of aspects 1 to 5, wherein the storage time is 24 hours or more.

[0021] (Aspect 7) The pet diaper according to any one of Aspects 1 to 6, wherein the inner sheet has a plurality of micropores formed therein.

[0022] According to the sixth or seventh aspect, the inner sheet can be easily torn, which makes it even easier to tear the portion corresponding to the boundary region of the main body.

[0023] (Aspect 8) The pet diaper of any one of Aspects 1 to 7, wherein, in the boundary region, the top sheet has at least one first opening that penetrates in the thickness direction and has a predetermined area, and the outer sheet has at least one second opening that penetrates in the thickness direction and has a predetermined area.

[0024] According to the eighth aspect, by providing openings in both the top sheet and the outer sheet at the boundary region, the portion of the main body corresponding to the boundary region can be made even easier to tear.

[0025] (Aspect 9) The pet diaper according to Aspect 8, wherein in the boundary region, the at least one first opening and the at least one second opening have a portion that overlaps with each other in the thickness direction.

[0026] According to Aspect 9, the material strength (thickness) of the main body portion can be reduced in the area where the first opening and the second opening overlap, making that area easier to break. As a result, the breaking process of the area corresponding to the boundary region of the main body portion can be further facilitated.

[0027] (Aspect 10) The pet diaper according to aspect 8, wherein the boundary region does not have a portion where the first opening and the second opening overlap each other in the thickness direction.

[0028] According to aspect 10, by preventing the formation of a portion where the first opening and the second opening overlap in the boundary region (i.e., a portion where the material strength (thickness) of the main body portion is particularly small), it is possible to prevent the portion of the main body portion corresponding to the boundary region from becoming too prone to tearing, and ultimately to prevent the portion corresponding to the boundary region from tearing unintentionally.

[0029] [Embodiments] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be designated by the same reference numerals, and redundant description will be omitted.

[0030] The overall configuration of a pet diaper 1 according to one embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a plan view of the pet diaper 1 as viewed from the skin side. FIG. 2 is a plan view of the pet diaper 1 as viewed from the non-skin side. FIGS. 1 and 2 show the pet diaper 1 in a stretched state, in which the pet diaper 1 has been stretched to a state where no wrinkles are formed. FIG. 3 is a cross-sectional view of the pet diaper 1 taken along line III-III in FIG. 1. FIG. 4 is a cross-sectional view of the pet diaper 1 taken along line IV-IV in FIG. 1. Openings 31a and 41a, which will be described later, are omitted from FIGS. 1 and 2. The pet diaper 1 is a diaper worn by a pet. In this specification, the term "pet" broadly encompasses vertebrates and invertebrates, and typically includes pet animals such as dogs, cats, rabbits, and hamsters. As an example, the pet diaper 1 is a diaper for a dog.

[0031] In this embodiment, the "skin side" refers to the side that faces the pet's skin when the pet diaper 1 is worn on the pet. The "non-skin side" refers to the side that faces away from the pet's skin when the pet diaper 1 is worn on the pet. As shown in FIG. 1 , the pet diaper 1 has a longitudinal direction Y that connects the pet's belly side to its dorsal side, a width direction X that is perpendicular to the longitudinal direction Y and extends along the pet's waistline, and a thickness direction Z that is perpendicular to the longitudinal direction Y and the width direction X. As shown in FIG. 3 , the thickness direction Z is the layering direction of the materials that make up the pet diaper 1 (such as the first sheet 31, second sheet 32, backsheet 4, and absorbent body 10, which will be described later). The straight line that passes through the center of the pet diaper 1 in the width direction X and is parallel to the longitudinal direction Y is referred to as the "center line CL."

[0032] The pet diaper 1 includes a main body portion 2 extending in the longitudinal direction Y and the width direction X. The main body portion 2 absorbs urine excreted by a pet wearing the pet diaper 1. The main body portion 2 is divided into a ventral portion 21 located on the pet's ventral side when the pet diaper 1 is worn, a dorsal portion 22 located on the pet's dorsal side when the pet diaper 1 is worn, and a crotch portion 23 located between the ventral portion 21 and the dorsal portion 22. The ventral portion 21, the crotch portion 23, and the dorsal portion 22 are aligned along the longitudinal direction Y from the pet's ventral side (front) to its dorsal side (rear). As an example, if the main body portion 2 is divided into four equal parts in the longitudinal direction Y, the one region located on the ventral side corresponds to the ventral portion 21, the one region located on the dorsal side corresponds to the dorsal portion 22, and the two regions located between the ventral portion 21 and the dorsal portion 22 (i.e., the central portion of the main body portion 2 in the longitudinal direction Y) correspond to the crotch portion 23.

[0033] The main body 2 has a first sheet 31 (top sheet), a second sheet 32, a back sheet 4, a pair of side sheets 5, and an absorbent body 10.

[0034] The first sheet 31 is a sheet made of nonwoven fabric and is positioned facing the pet's skin when worn. The first sheet 31 may be, for example, an air-through nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a point-bond nonwoven fabric, a needle-punched nonwoven fabric, or a spunlace nonwoven fabric. In this embodiment, the first sheet 31 is made of an air-through nonwoven fabric. Examples of fiber materials for the first sheet 31 include rayon, acetate, cotton, pulp, and synthetic fibers. In this embodiment, as an example, the first sheet 31 is positioned between the tops of the left and right side sheets 5 in the stretched state ( FIG. 1 ) and has a rectangular shape extending in the longitudinal direction Y from the ventral end 2 a of the main body 2 to the dorsal end 2 b. The center of the first sheet 31 in the width direction X is located on the center line CL. However, the shape of the first sheet 31 and the area in which the first sheet 31 is positioned are not limited to this embodiment. The first sheet 31 may be provided at least in a portion including a boundary region B, which will be described later. The first sheet 31 is bonded to the second sheet 32 ​​by a hot melt adhesive (HMA).

[0035] The second sheet 32 ​​is a liquid-permeable sheet disposed between the first sheet 31 and the absorbent body 10. The second sheet 32 ​​may be made of, for example, the same nonwoven fabric as the first sheet 31. The second sheet 32 ​​is wider than the first sheet 31 and is also disposed in a position where it overlaps with the pair of side sheets 5.

[0036] The backsheet 4 is a liquid-impermeable sheet that is placed on the side opposite the pet's skin when the diaper is worn. The backsheet 4 can be formed, for example, from a liquid-impermeable nonwoven fabric, a synthetic resin film, or a composite sheet of these. In this embodiment, the backsheet 4 has an exterior sheet 41 (outer sheet) and a leak-proof sheet 42 (inner sheet). The exterior sheet 41 is placed outside (closer to the skin) than the leak-proof sheet 42 and constitutes the outermost surface of the main body 2. The exterior sheet 41 is formed, for example, from a liquid-impermeable nonwoven fabric. The leak-proof sheet 42 is placed between the exterior sheet 41 and the absorbent body 10 (absorbent core 11) and is bonded to the exterior sheet 41. More specifically, the exterior sheet 41 is bonded to the leak-proof sheet 42 with a hot melt adhesive (HMA). The leak-proof sheet 42 is formed, for example, from a liquid-impermeable synthetic resin film.

[0037] The pair of side sheets 5 are sheets for forming leg side gathers LSG, which are upstanding leak-proof gathers, in the abdominal portion 21 and the crotch portion 23. The side sheets 5 may be formed, for example, from a water-repellent or hydrophobic nonwoven fabric. As shown in FIGS. 1, 3, and 4, each side sheet 5 is disposed on both sides of the main body portion 2 in the width direction X so as to expose the first sheet 31. Each side sheet 5 extends along the longitudinal direction Y from the abdominal end 2a of the main body portion 2 to the dorsal end 2b of the main body portion 2. As shown in FIGS. 3 and 4, the outer edge of each side sheet 5 in the width direction X coincides with the outer edge of the back sheet 4, forming the outer edge 2c of the main body portion 2. The inner portion of each side sheet 5 in the width direction X is folded back toward the skin side. An elastic member 7 stretched in the longitudinal direction Y is disposed between the folded side sheets 5, from the abdominal portion 21 to the crotch portion 23. The elastic member 7 is, for example, rubber thread.

[0038] As shown in Figure 1, each side sheet 5 is joined (fixed) to the second sheet 32 ​​at fixing portions R surrounded by dashed lines and hatched with diagonal lines. Each fixing portion R is disposed over the entire area in the longitudinal direction Y of the main body portion 2. Each fixing portion R has a fixing portion R1 extending in the longitudinal direction Y along the outer edge of the fixing portion R in the width direction X, a rectangular fixing portion R2 formed at the ventral end of the fixing portion R in the longitudinal direction Y, and a rectangular fixing portion R3 formed at the dorsal end of the fixing portion R in the longitudinal direction Y.

[0039] The upright portions 5a are formed by the portions of the side sheets 5 between the inner end R2a of the fixed portion R2 in the longitudinal direction Y and the inner end R3a of the fixed portion R3 in the longitudinal direction Y (i.e., the portions of the side sheets 5 where the elastic members 7 are disposed and which are not joined to the second sheet 32). The upright portions 5a function as leg side gathers LSG by standing up due to contraction of the elastic members 7. More specifically, the upright portions 5a are configured such that, by contracting in the longitudinal direction Y while both ends in the longitudinal direction Y are fixed by the fixed portions R2 and R3, they stand up with the inner end R1a of the fixed portion R1 in the width direction X as a fulcrum. In other words, the end R1a of the fixed portion R1 functions as a fulcrum for the leg side gathers LSG.

[0040] The absorbent body 10 is disposed between the first sheet 31 and the backsheet 4 (in this embodiment, between the second sheet 32 ​​and the leak-proof sheet 42). As shown in FIG. 3 , the absorbent body 10 comprises an absorbent core 11 and a core wrap 12 covering the upper and lower surfaces of the absorbent core 11. The absorbent core 11 is disposed so as to cover the ventral portion 21 and the crotch portion 23, but is not disposed in the dorsal portion 22. The absorbent core 11 is a member that absorbs pet urine and has liquid absorption and liquid retention properties. The absorbent core 11 is a laminate of absorbent materials containing, for example, pulverized pulp, superabsorbent polymer (SAP), or a mixture thereof. The core wrap 12 is, for example, a tissue or nonwoven fabric sheet. As an example, the absorbent core 11 is formed in a gourd shape (or an hourglass shape) when viewed in the thickness direction Z, with a constricted central portion in the longitudinal direction Y of the absorbent core 11.

[0041] As shown in FIGS. 1 and 2 , the main body portion 2 is provided with a tail insertion portion 6 for inserting a pet's tail. As an example, the tail insertion portion 6 is composed of one cut portion 6a (first cut portion) and two cut portions 6b (second cut portions) provided separately from the cut portion 6a. The cut portions 6a, 6b are formed by cutting the main body portion 2 in the thickness direction Z and penetrate the main body portion 2 in the thickness direction Z. The cut portion 6a is provided in the center of the crotch portion 23 in the width direction X in a region on the back side of the absorbent core 11. The cut portion 6a is formed in a curved (arcuate) shape that extends in the width direction X across the center line CL and is convex toward the back side. The two cut portions 6b are provided on both sides of the center line CL, at positions closer to the cut portion 6a and on the back side of the cut portion 6a. The two cut portions 6b have a linear shape that is inclined with respect to the longitudinal direction Y so that the distance between the two cut portions 6b increases from the ventral side toward the dorsal side.

[0042] By pushing the portion of the cut portion 6a between the ends in the width direction X and closer to the ventral side than the cut portion 6a toward the non-skin side, a substantially semicircular opening for inserting the pet's tail is formed. Furthermore, by tearing the portion of the main body 2 between the cut portion 6a and the two cut portions 6b, the cut portion 6a and the two cut portions 6b can be connected. In this case, as shown in FIG. 2 , it is possible to form an opening having an area A larger than the opening formed by the cut portion 6a. Thus, in this embodiment, the tail insertion portion 6 is configured so that the opening size can be adjusted (enlarged) by connecting the two cut portions 6b to the cut portion 6a as needed. Note that the shape and size of the tail insertion portion 6 are not limited to those of this embodiment. For example, at least one of the cut portions 6a, 6b may be formed as an opening having a predetermined area (e.g., an oval opening) instead of a cut.

[0043] A pair of flap portions F1 protruding outward in the width direction X are formed on both sides of the ventral portion 21 in the width direction X. Similarly, a pair of flap portions F2 protruding outward in the width direction X are formed on both sides of the dorsal portion 22 in the width direction X. A pair of fastening tabs 50 are provided on the pair of flap portions F1. A target portion 53 is provided in the region between the pair of flap portions F2 on the dorsal portion 22.

[0044] Each fastening tab 50 extends outward in the width direction X from both ends (ends F1a in the width direction X of the flap portion F1) of the main body portion 2 (flap portion F1). Each fastening tab 50 has a rectangular shape that is long in the width direction X and is disposed near the end 2a on the ventral side of the main body portion 2. Each fastening tab 50 has a base sheet 51 joined to the flap portion F1 and an engaging portion 52 provided on the skin-facing surface of the base sheet 51. A portion of the base sheet 51 is sandwiched, for example, between the side sheet 5 and the back sheet 4. The engaging portion 52 is, for example, a hook-and-loop fastener (e.g., a plurality of hook-shaped members) configured to be engageable with a target portion 53.

[0045] The target portion 53 has a rectangular shape that is long in the width direction X, and is disposed on the non-skin side surface of the back sheet 4 (exterior sheet 41) near the back end 2b of the main body portion 2. As shown in Fig. 5, in the attached state, the engaging portions 52 of the pair of fastening tabs 50 engage with the target portion 53. Fig. 5 shows the state in which the pet P is standing in the attached state.

[0046] The main body 2 has a pair of elastic members 8 that are arranged to extend in the longitudinal direction Y along the outer edge 2c of the main body 2 in the width direction X (in this embodiment, a portion of the outer edge 2c located in the crotch region 23 where the flaps F1 and F2 are not provided) and that contract in the longitudinal direction Y. Each elastic member 8 is, for example, rubber thread similar to the elastic member 7. In this embodiment, as shown in FIG. 3 , each elastic member 8 is arranged between the second sheet 32 ​​and the back sheet 4 (leak-proof sheet 42). As shown in FIG. 5 , when the diaper is worn, the pair of elastic members 8 contract in the longitudinal direction Y, causing the outer edge 2c of the main body 2 to function as leg gathers that fit around the legs of the pet P.

[0047] The pet diaper 1 has a structure that makes it easier to tear the portion between the cut portion 6a and the two cut portions 6b (boundary region B shown in Fig. 8). An example of this structure will be described in detail below.

[0048] As shown in FIGS. 3, 4, and 6, the first sheet 31 has a plurality of regularly arranged openings 31a (first openings). Each opening 31a penetrates the first sheet 31 in the thickness direction Z and has a predetermined area. That is, unlike cutouts, each opening 31a is formed by cutting out a portion of the first sheet 31 so as to have a predetermined area. In this embodiment, each opening 31a is formed in a circular shape when viewed from the thickness direction Z. As shown in FIG. 6, the openings 31a are arranged in a diamond lattice pattern, and the distance d1 between the centers C1 of two adjacent openings 31a is the same for all openings 31a. The width w1 of the openings 31a is, for example, approximately 1.2 mm. In this embodiment, since the openings 31a are circular, the width w1 of the openings 31a is equal to the diameter of the openings 31a. When the opening 31 a has a shape other than a circle (for example, an ellipse), the width w1 of the opening 31 a can be defined as the radius of a circle having the smallest radius that encompasses the opening 31 a (in other words, the maximum value of the distance between any two points on the edges of the opening 31 a). Since the first sheet 31 is provided on the second sheet 32, the surface of the second sheet 32 ​​is exposed to the skin through the opening 31 a.

[0049] As shown in Figures 3, 4, and 7, the exterior sheet 41 has a plurality of regularly arranged openings 41a (second openings). Each opening 41a penetrates the exterior sheet 41 in the thickness direction Z and has a predetermined area. In this embodiment, each opening 41a has a shape similar to that of the opening 31a and is arranged in the same manner as the plurality of openings 31a. That is, each opening 41a is formed in a circular shape when viewed from the thickness direction Z. As shown in Figure 7, the plurality of openings 41a are arranged in a diamond lattice pattern, and the distance d2 between the centers C2 of two adjacent openings 41a is the same for all openings 41a. The width w2 of the openings 41a is, for example, approximately 1.2 mm. In this embodiment, since the openings 41a are circular, the width w2 of the openings 41a is equal to the diameter of the openings 41a. If the opening 41a has a shape other than a circle (for example, an ellipse), the width w2 of the opening 41a can be defined as the radius of a circle with the smallest radius that encompasses the opening 41a (in other words, the maximum distance between any two points on the edges of the opening 41a). Because the exterior sheet 41 is provided on the leak-barrier sheet 42, the surface of the leak-barrier sheet 42 is exposed to the non-skin side through the opening 41a.

[0050] At least one opening (opening 31a or opening 41a) is provided in at least one of the first sheet 31 and the exterior sheet 41 in the boundary region B between the cut portions 6a and 6b of the main body 2. As shown in Fig. 8, in this embodiment, as an example, two openings 31a (i.e., openings 31a arranged so as to overlap at least a portion of the boundary region B) and two openings 41a (i.e., openings 41a arranged so as to overlap at least a portion of the boundary region B) are arranged in the boundary region B.

[0051] As an example, boundary region B may be defined as a region along a line segment connecting two points (i.e., point Pa on cut portion 6a and point Pb on cut portion 6b) where the linear distance between cut portion 6a and cut portion 6b is shortest. In other words, boundary region B may be defined as a region (i.e., a region including the line segment) where the break length required to break main body portion 2 and connect cut portion 6a and cut portion 6b is shortest. In this embodiment, point Pb corresponds to the end of cut portion 6b on the cut portion 6a side (ventral side), which extends linearly. Point Pa corresponds to the position where the distance from point Pb is shortest. For example, boundary region B may be defined as a rectangular region having a predetermined width (e.g., the same width as the widths w1 and w2 of openings 31a and 41a) in a direction perpendicular to the line segment and extending from point Pa to point Pb with the line segment as its centerline. In this embodiment, the boundary region B exists in two places: between the cut portion 6 a and the left cut portion 6 b, and between the cut portion 6 a and the right cut portion 6 b. Fig. 8 shows a region including the boundary region B between the cut portion 6 a and the left cut portion 6 b.

[0052] Next, the effects of the above-described pet diaper 1 will be described. In the pet diaper 1, the tail insertion portion 6 has cut portions 6a and 6b that are provided separately from each other. That is, by connecting the cut portions 6a and 6b, a tail insertion hole of a predetermined size (in this embodiment, the size corresponding to region A in FIG. 2 ) can be formed. Furthermore, in the boundary region B between the cut portions 6a and 6b, openings 31a, 41a are provided in at least one of the topsheet (first sheet 31) and the exterior sheet 41 that constitute the main body portion 2 (in this embodiment, both sheets). That is, as shown in FIG. 8 , at least one opening (in this embodiment, two openings 31a and two openings 41a) is arranged so that at least a portion of the opening is included in the boundary region B. By providing such openings in the boundary region B, the material strength of the portion of the main body portion 2 corresponding to the boundary region B can be weakened, making that portion easier to tear. Furthermore, since the portion of the main body 2 corresponding to the boundary region B is more easily torn, the main body 2 is prevented from tearing in an unexpected direction when a user tries to tear that portion to connect the cut portions 6a and 6b while using the pet diaper 1. Therefore, the pet diaper 1 allows the tearing process for connecting the multiple cut portions 6a and 6b to be performed easily and accurately.

[0053] In this embodiment, a plurality of openings 31 a or 41 a (four in total) are arranged in the boundary region B, but to obtain the above-described effect, it is sufficient that at least one opening is arranged in the boundary region B. However, from the viewpoint of improving the above-described effect, it is preferable that a plurality of openings be arranged in the boundary region B, as in this embodiment.

[0054] As shown in Figure 8, the width w1 of the opening 31a (see Figure 6) is smaller than the shortest distance between the cutting portions 6a and 6b (i.e., the distance d between points Pa and Pb). Similarly, the width w2 of the opening 41a (see Figure 7) is also smaller than the distance d. That is, "w1 < d" and "w2 < d" are satisfied. This configuration prevents the cutting portions 6a and 6b from connecting via the openings 31a and 41a before use of the pet diaper 1, and allows the cutting portions 6a and 6b to be properly maintained separated.

[0055] Furthermore, in this embodiment, the widths w1 and w2 of the openings 31a and 41a are set to be equal to or less than half of the shortest distance (distance d). That is, "w1≦d / 2" and "w2≦d / 2" are satisfied. This configuration more effectively maintains the separation between the cut portions 6a and 6b before use of the pet diaper 1, thereby preventing unintentional tearing of the portion of the main body 2 corresponding to the boundary region B (the portion between the cut portions 6a and 6b).

[0056] The distance d is preferably set to 3 mm or more and 5 mm or less. By setting the distance d to 3 mm or more (i.e., not making the distance between the cutting portions 6 a and 6 b too short), it is possible to effectively prevent the portion of the main body 2 corresponding to the boundary region B from being unintentionally torn. Furthermore, by setting the distance d to 5 mm or less (i.e., not making the distance between the cutting portions 6 a and 6 b too long), it is possible to prevent the portion of the main body 2 corresponding to the boundary region B from being difficult to torn.

[0057] As described above, the first sheet 31 is bonded to the second sheet 32 ​​by the hot melt adhesive. In the present embodiment, as an example, as shown in Fig. 9 , linear hot melt adhesive H is discharged in a spiral shape from a plurality of nozzles (not shown) arranged in the width direction X, and is disposed between the first sheet 31 and the second sheet 32, thereby bonding the first sheet 31 to the second sheet 32. The width d of such hot melt adhesive H is ＨThe line width is preferably larger than the width w1 of the opening 31a and smaller than the distance d1 (opening pitch) between the centers C1 of two adjacent openings 31a.

[0058] According to the above-mentioned configuration, it is possible to prevent the hot melt adhesive H from seeping out from the opening 31a while suitably suppressing the delamination of the main body 2 at the tail insertion portion 6. More specifically, Ｈ If the width d is set to be equal to or less than the width w1 of the opening 31a, for example, when the hot melt adhesive H is applied to the first sheet 31, the entire line width of the hot melt adhesive H may enter the opening 31a, and the hot melt adhesive H may easily leak out of the opening 31a. Ｈ By making the width d larger than the width w1, it is possible to prevent the hot melt adhesive H from leaking through the opening 31a as described above, and also to ensure the adhesive strength between the first sheet 31 and the second sheet 32. Ｈ If the distance is set to d1 or more, the entire opening 31a is likely to be covered with the hot melt adhesive H, which may impair the effects of the opening 31a (for example, the effect of facilitating the breaking of the boundary region B as described above, the effect of increasing breathability, etc.). Ｈ is "w1<d Ｈ It is preferable that the value be set to "<d1".

[0059] Similarly, as shown in Fig. 9, the hot melt adhesive H is spirally discharged and disposed between the exterior sheet 41 and the leak-proof sheet 42, thereby bonding the exterior sheet 41 to the leak-proof sheet 42. For the same reasons as those described above, the width d of the hot melt adhesive H is Ｈ The line width (line width) is larger than the width w2 of the opening 41a and smaller than the distance d2 (opening pitch) between the centers C2 of two adjacent openings 41a (i.e., "w2<d Ｈ <d2).

[0060] The moisture permeability of the leak-proof sheet 42 is 500 g / (m ２24h) or more. That is, the material of the leak barrier sheet 42 preferably satisfies the above-mentioned moisture permeability requirements. The moisture permeability of the leak barrier sheet 42 can be measured using the moisture permeability test method (cup method) for moisture-proof packaging materials specified in "JIS Z 0208:1976." Alternatively, the leak barrier sheet 42 preferably has a plurality of micropores formed therein. The width (diameter) of the micropores is, for example, 0.05 mm or more and 1.0 mm or less, and the center-to-center distance (pitch) of adjacent micropores is, for example, 0.05 mm or more and 1.0 mm or less. Alternatively, the leak barrier sheet 42 may satisfy both of the above requirements. That is, the leak barrier sheet 42 may have a plurality of micropores formed therein and satisfy the above-mentioned moisture permeability requirements. By configuring the leak barrier sheet 42 to satisfy at least one of the above requirements, the leak barrier sheet 42 (the portion located in the boundary region B of the main body 2) can be easily torn. As a result, the tearing process of the portion of the main body 2 corresponding to the boundary region B can be further facilitated.

[0061] In the boundary region B, at least one opening 31a is provided in the first sheet 31, and at least one opening 41a is provided in the exterior sheet 41. In the example shown in Fig. 8, two openings 31a and two openings 41a are arranged so as to at least partially overlap in the boundary region B. According to the above configuration, by providing openings 31a, 41a in both the first sheet 31 and the exterior sheet 41, which are located on opposite sides of the leak-barrier sheet 42 in the boundary region B, it is possible to make the portion of the main body 2 corresponding to the boundary region B even easier to tear.

[0062] As shown in FIG. 8 , at least one opening 31 a and at least one opening 41 a have overlapping portions in the Z-axis direction in the boundary region B. In this embodiment, each of the two openings 31 a and each of the two openings 41 a have overlapping portions in the boundary region B. This configuration can reduce the material strength (thickness) of the main body 2 in the overlapping portions between the openings 31 a and 41 a, making these portions easier to break. As a result, the breaking process of the portion of the main body 2 corresponding to the boundary region B can be further facilitated.

[0063] Alternatively, as in the modified example shown in FIG. 10 , the openings 31 a and 41 a may not overlap with each other in the Z-axis direction in the boundary region B. In other words, the openings 31 a and 41 a may be arranged so as not to overlap with each other in the Z-axis direction, at least in the boundary region B. In the example of FIG. 10 , the positions of the multiple openings 31 a and the multiple openings 41 a arranged in a similar diamond lattice pattern are shifted, so that the openings 31 a and 41 a are arranged so as not to overlap with each other in regions other than the boundary region B. According to the above configuration, by preventing the formation of an overlapping portion between the openings 31 a and the openings 41 a in the boundary region B (i.e., a portion where the material strength (thickness) of the main body 2 is particularly small), it is possible to prevent the portion of the main body 2 corresponding to the boundary region B from becoming too easily torn and, ultimately, to prevent the portion corresponding to the boundary region B from being torn unintentionally.

[0064] Furthermore, in this embodiment, the tail insertion section 6 is positioned so as not to overlap the absorbent core 11. That is, in the region where the tail insertion section 6 is provided (e.g., region A in FIG. 2 ), no liquid-absorbent layer (absorbent body 10) is disposed between the second sheet 32 ​​and the leak-barrier sheet 42, and the second sheet 32 ​​and the leak-barrier sheet 42 are joined to each other with an adhesive such as a hot-melt adhesive. This prevents urine from leaking from the edge (slit) of the tail insertion section 6. Furthermore, by providing multiple openings 31a in the first sheet 31 on the absorbent body 10, it is possible to appropriately prevent urine from flowing or being retained on the surface of the first sheet 31. Furthermore, by forming the sheets disposed on the absorbent body 10 into a two-layer structure of the first sheet 31 and the second sheet 32, and by providing openings 31a only in the upper first sheet 31 and not in the second sheet 32 ​​covering the absorbent body 10, it is possible to appropriately prevent SAP and other substances contained in the absorbent body 10 (mainly the absorbent core 11) from leaking to the outside.

[0065] [Modifications] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. The materials and shapes of each component are not limited to those described above, and various materials and shapes can be used. Furthermore, some components included in the configurations of the above-described embodiments may be modified or omitted, or other components may be added.

[0066] For example, in the above embodiment, the openings 31a, 41a are formed in both the first sheet 31 and the exterior sheet 41, but openings may be formed in only one of the first sheet 31 and the exterior sheet 41. Furthermore, from the viewpoint of facilitating the tearing process of the portion corresponding to the boundary region B described above, the openings 31a or the openings 41a may be provided only in the boundary region B. In other words, the openings 31a or the openings 41a may not be provided in regions other than the boundary region B. Furthermore, the arrangement pattern of the multiple openings 31a is not limited to the diamond lattice pattern of the above embodiment, and the multiple openings 31a may be arranged according to other arrangement patterns. Furthermore, the multiple openings 31a may be arranged irregularly. The same applies to the multiple openings 41a.

[0067] In the above embodiment, the sheet member closer to the body than the absorbent body 10 is composed of two layers of sheets (first sheet 31 and second sheet 32), but it may be composed of only one layer of top sheet. In this case, an opening similar to opening 31a may be provided in the top sheet layer.

[0068] 1...Pet ​​diaper, 2...Main body portion, 4...Back sheet, 6...Tail insertion portion, 6a...Cut portion (first cut portion), 6b...Cut portion (second cut portion), 11...Absorbent core, 31...First sheet (surface sheet), 31a...Opening (first opening), 41...Outer sheet (outer sheet), 41a...Opening (second opening), 42...Leak-proof sheet (inner sheet), B...Boundary region, H...Hot melt adhesive, P...Pet.

Claims

1. A pet diaper to be worn on a pet, comprising a main body having a top sheet made of nonwoven fabric that is positioned in a position facing the pet's skin when the pet diaper is worn on the pet, a back sheet that is positioned on the side opposite the pet's skin when the pet diaper is worn, and an absorbent core that is positioned between the top sheet and the back sheet, wherein the back sheet has an outer sheet made of nonwoven fabric that constitutes the outermost surface of the main body, and an inner sheet that is positioned between the outer sheet and the absorbent core, the main body is provided with a tail insertion portion for inserting the pet's tail, the tail insertion portion having a first cut portion formed by cutting the main body in the thickness direction, which is the stacking direction of the sheets that constitute the main body, and a second cut portion that is provided separately from the first cut portion, and in the boundary region between the first cut portion and the second cut portion of the main body, at least one of the top sheet and the outer sheet is provided with at least one opening that penetrates in the thickness direction and has a predetermined area.

2. The pet diaper according to claim 1, wherein the width of the opening is smaller than the shortest distance between the first cut portion and the second cut portion.

3. The pet diaper according to claim 2, wherein the width of the opening is equal to or less than half of the shortest distance.

4. The pet diaper according to claim 3, wherein the shortest distance is between 3 mm and 5 mm.

5. A pet diaper as described in claim 1, wherein the at least one opening includes a plurality of openings arranged in a regular pattern, and the width of a line of hot melt adhesive adhered to an area including the tail insertion portion of at least one of the top sheet and the outer sheet in which the plurality of openings are provided is greater than the width of the opening and smaller than the distance between the centers of two adjacent openings.

6. The moisture permeability of the inner sheet is 500 g / (m ２ The pet diaper according to claim 1, wherein the retention time is 24 hours or more.

7. The pet diaper according to claim 1, wherein the inner sheet has a plurality of micropores formed therein.

8. A pet diaper as described in claim 1, wherein, in the boundary region, the top sheet is provided with at least one first opening which penetrates in the thickness direction and has a predetermined area, and the outer sheet is provided with at least one second opening which penetrates in the thickness direction and has a predetermined area.

9. The pet diaper according to claim 8, wherein in the boundary region, the at least one first opening and the at least one second opening have portions that overlap with each other in the thickness direction.

10. The pet diaper according to claim 8, wherein in the boundary region, there is no portion where the first opening and the second opening overlap each other in the thickness direction.

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