CN106659609B

CN106659609B - Disposable diaper having a disposable diaper

Info

Publication number: CN106659609B
Application number: CN201580041182.XA
Authority: CN
Inventors: 矶贝友美; 三宅真纪
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2014-07-25
Filing date: 2015-07-24
Publication date: 2020-07-03
Anticipated expiration: 2035-07-24
Also published as: WO2016013663A1; PH12017500113B1; AU2015293071B2; KR102479241B1; AU2015293071A1; JP6461505B2; KR20170036041A; MY185563A; JP2016029973A; CN106659609A; PH12017500113A1

Abstract

The disposable diaper is provided with a side flap, includes a first waist portion, a crotch portion, and a second waist portion arranged in a longitudinal direction, and includes: a first sheet member and a second sheet member overlapped with each other; a fastening tape joined to the second waistline side of the side flap; and a tear line provided on the second waistline side of the side flap, wherein a plurality of holes penetrating the first sheet member and the second sheet member are arranged along the tear line. The first sheet member includes a plurality of hole edge portions corresponding to the plurality of holes, each hole edge portion being arranged along an outer periphery of each hole, and at least one of the plurality of hole edge portions does not overlap a joining portion joining the first sheet member and the second sheet member that overlap each other.

Description

Disposable diaper having a disposable diaper

Technical Field

The present invention relates to a disposable diaper.

Background

Disposable diapers of the unfolded type have been widely used. In such an open-type disposable diaper, the tape fastener is provided to the side flap, and a target tape for joining the tape fastener is provided at the front portion (also referred to as a ventral portion or a front waistline portion). Since a disposable diaper of an unfolded type can be easily put on a wearer even in a state where the wearer lies down, such a diaper is widely used for, in particular, newborns and young children.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-212212

Patent document 2: japanese patent laid-open publication No. 2013-138702

Patent document 3: japanese patent laid-open publication No. 2013-230256

Patent document 4: japanese patent laid-open publication No. 158573 (2013)

Patent document 5: international publication No. 2013/077360

Disclosure of Invention

Problems to be solved by the invention

The unfolded type disposable diaper may include a tear line for tearing the exterior part when removing the used diaper from the body of the wearer to remove the diaper without releasing the engagement of the fastening tape. Each of the tear lines is formed with a perforation (formation) or the like in which a plurality of holes are arranged. By tearing the diaper along the perforations, the diaper can be simply removed without leaking the excreta and the like inside the diaper.

At the same time, if such perforations are readily perceptible, the diaper may be perceived by the user of the diaper, etc., as having the following impression: the diaper has holes and/or the strength of the diaper is low. This may prevent the user from feeling comfortable when using the diaper.

The present invention has been made in view of the above problems, and an object thereof is to configure a tear-off line provided in a disposable diaper to be hardly noticeable.

Means for solving the problems

In order to achieve the above object, one aspect of the present invention is a disposable diaper including a first waist portion, a crotch portion, and a second waist portion arranged in a longitudinal direction, the disposable diaper including: a side flap configured such that a first sheet member and a second sheet member overlap each other; a tape fastener which is joined to the second waistline portion side of the side flap; a tear line provided on the second waistline portion side of the side flap, the tear line being formed by a plurality of holes arranged to penetrate the first sheet member and the second sheet member, the first sheet member includes a plurality of hole edge portions corresponding to the plurality of holes, each hole edge portion being along an outer periphery of each hole, respectively, the plurality of hole edge portions including at least one hole edge portion not overlapping with the joining portion, the joining portion joins the first sheet member and the second sheet member overlapped with each other, the disposable diaper is configured such that the fastening tape can be torn off by tearing the side flap along the tear line, the fastening tape being joined to the first waistline portion to form a single waistline opening portion and a pair of leg opening portions, and the plurality of holes included in the tear-off line are arranged on a line extending from a portion constituting the waist opening portion to a portion constituting the leg opening portion.

Other features of the present invention will become apparent from the description and drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, in a disposable diaper including a tear line, a tear line that is hardly noticeable can be configured.

Drawings

Fig. 1 is an unfolded plan view showing a diaper 1.

Fig. 2A to 2C are exploded explanatory views showing parts of the diaper 1. Fig. 2A is an exploded explanatory view showing the front portion 3. Fig. 2B is an exploded explanatory view showing the crotch portion 5. Fig. 2C is an exploded explanatory view showing the rear portion 7.

Fig. 3 is a view showing a state in which a low-weight infant wears the diaper 1.

Fig. 4 is a diagram showing a state in which the diaper 1 is removed from the body of a wearer.

Fig. 5A and 5B are diagrams respectively showing the configuration of the tear line 17 of the diaper 1.

Fig. 6 is an enlarged view showing a region of the rear portion 7b of fig. 5A.

Fig. 7 is a view showing a section taken along line B-B of fig. 6.

Fig. 8A and 8B are diagrams illustrating examples of other patterns of the joint 50.

Fig. 9 is an explanatory diagram showing a state of the hole 17h when a lateral force acts in fig. 7.

Fig. 10 is an explanatory diagram showing an example when the engaging portion 50 and the brim portion 17he overlap each other.

Fig. 11A and 11B are explanatory views showing an example when the hole edge portion 17he and the joint portion 50 overlap each other between the first sheet member and the second sheet member.

Detailed Description

At least the following matters will become clear from the description of the present specification with reference to the accompanying drawings.

A disposable diaper including a first waist portion, a crotch portion, and a second waist portion arranged in a longitudinal direction, the disposable diaper comprising: a side flap configured such that a first sheet member and a second sheet member overlap each other; a tape fastener which is joined to the second waistline portion side of the side flap; a tear line, the tear line set up in the side flap the second waistline portion side, the tear line is link up by arranging first sheet member with the plurality of holes of second sheet member form, first sheet member includes with a plurality of hole marginal parts that the hole corresponds, and each hole marginal part is respectively along the periphery of each hole, and is a plurality of the hole marginal part includes at least one hole marginal part that does not overlap with the junction, the junction makes mutual overlapping first sheet member with the second sheet member joint.

According to such a disposable diaper, the plurality of holes constituting the tear line are less likely to be enlarged and thus less likely to be visually recognized. Thus, the tear line formed in the diaper is less noticeable.

In such a disposable diaper, it is desirable to include a third sheet member overlapping the first sheet member on a face of the first sheet member on the opposite side to the side on which the second sheet member is located, wherein at least one of the plurality of hole edge portions does not overlap with either a joining portion joining the first sheet member and the second sheet member or a joining portion joining the first sheet member and the third sheet member.

According to such a disposable diaper, in the tear line formed at the portion where the three sheet members are laminated, even when a force acts in the lateral direction to stretch the sheet member, the enlargement of the hole constituting the tear line is less easily visually recognized. Therefore, the tear line is hardly noticeable.

In such a disposable diaper, it is desirable to include a third sheet member overlapping the first sheet member on a face of the first sheet member on the opposite side to the side on which the second sheet member is located, wherein at least one of the plurality of hole edge portions overlaps a joining portion joining the first sheet member and the second sheet member, but does not overlap a joining portion joining the first sheet member and the third sheet member.

According to such a disposable diaper, in the tear line formed in the portion where the three sheet members are laminated, when a force acts in the lateral direction to stretch the sheet member, the enlargement of the hole constituting the tear line is easily visually recognized when viewed from the second sheet member side, and the enlargement of the hole is less easily visually recognized when viewed from the third sheet member side. Thus, the following tear line can be formed: it is hardly noticeable on one side (outside) of the diaper and easily noticeable on the other side (inside).

In such a disposable diaper, it is desirable that at least one of the first sheet member and the third sheet member is formed of a nonwoven fabric.

According to such a disposable diaper, the outer edges (edges) of the holes can be made less noticeable by disposing the fine fibers on the surface of the nonwoven fabric. Therefore, the tear line is hardly noticeable.

In such a disposable diaper, it is desirable that the joining portion is formed such that a hot melt adhesive is applied to at least one of the first sheet member and the second sheet member in a spiral manner.

According to such a disposable diaper, the amount of the hot melt adhesive used for joining the sheet members can be reduced, and the cost can be reduced. Further, the weight per unit area of the hot melt adhesive applied to the sheet member(s) can be reduced. Therefore, the sheet member is suppressed from being hardened by the hot melt adhesive, so that the tactile feel of the diaper 1 can be kept soft. Further, the hole edge portion and the joint portion can be made to overlap each other less easily than in the case where the hot melt adhesive is applied in a band-like manner. Therefore, the tear line is hardly noticeable.

In such a disposable diaper, it is desirable that the ratio of the hole per unit length in the direction in which the tear line extends in a region corresponding to a region in which the tape fastener is disposed in the longitudinal direction is smaller than the ratio of the hole per unit length in the direction in which the tear line extends in a region corresponding to a region in which the tape fastener is not disposed in the longitudinal direction.

According to such a disposable diaper, even in the case where the tape fasteners are stretched in the transverse direction when the diaper is put on a wearer, the side flaps can be suppressed from being torn off by mistake. Furthermore, the side flaps can simply be torn off along the tear lines when the diaper is removed.

In such a disposable diaper, it is desirable that the fastening tape is joined to the first waistline portion to form a single waistline opening portion and a pair of leg opening portions, and the plurality of holes included in the tear-off line are aligned on a route extending from a portion constituting the waistline opening portion to a portion constituting the leg opening portion.

According to such a disposable diaper, even when the wearer of the diaper is in a prone position (positioning position), the portion connected to the fastening tape can be torn along the tear line, and the diaper can be removed while moving the body of the wearer as little as possible.

In such a disposable diaper, it is desirable that the tear line includes: a linear portion extending in the longitudinal direction from a portion constituting the waistline opening portion; and a curved portion that curves toward the lateral outside at a position that is inside in the longitudinal direction of the linear portion.

According to such a disposable diaper, even in a state where the wearer takes a positioning posture with his/her legs bent in an M-shape, the portion corresponding to the tape fastener can be easily torn off.

In such a disposable diaper, it is desirable to include a tear line provided on the first waistline portion side of the side flap at the same position as the tear line in the lateral direction, the tear line being formed by a plurality of holes arranged to penetrate the first sheet member and the second sheet member.

According to such a disposable diaper, the abdomen side of the diaper can be torn along the tear line in a state where the diaper is worn. By folding back the tear-off portion, the abdomen of the wearer can be exposed while the diaper is worn by the wearer. In particular, in the case where the wearer is a low-weight infant and phototherapy or the like is required, it is possible to irradiate light over a wide range of such an exposed abdomen while keeping the body of the low-weight infant as free from contact as possible.

Embodiments of the present invention are described in detail below with reference to the accompanying drawings

< basic Structure of Disposable diaper 1 >

The disposable diaper 1 according to the present embodiment (hereinafter, simply referred to as diaper 1) is intended to be worn mainly by newborns or infants, and is suitable for low-body-weight infants weighing 3000g or less, particularly low-body-weight infants weighing less than 2500 g. It should be noted that low birth weight infants include not only low birth weight infants (less than 2500g in weight), but also very low birth weight infants (less than 1500g in weight) and ultra-low birth weight infants (less than 1000g in weight).

Fig. 1 is an unfolded plan view showing a diaper 1. Fig. 2A to 2C are exploded explanatory views showing parts of the diaper 1. Fig. 2A is an exploded explanatory view showing the front portion 3. Fig. 2B is an exploded explanatory view showing the crotch portion 5. Fig. 2C is an exploded explanatory view showing the rear portion 7.

The diaper 1 according to the present embodiment is a so-called open-type disposable diaper, and includes a first waist portion 3, a crotch portion 5, and a second waist portion 7 as shown in fig. 1. The first waist portion 3 is positioned at the front (ventral side, front waist) of the wearer. The second waist portion 7 is positioned at the back (back side, back waist) of the wearer. However, the diaper 1 can be worn such that the first waist portion 3 is positioned on the back side of the wearer and the second waist portion 7 is positioned on the abdominal side of the wearer. In the following description, for convenience, the "first waist portion 3" may be referred to as the "front portion 3" and the "second waist portion 7" may be referred to as the "rear portion 7".

Further, as shown in fig. 1, a direction will be defined. That is, a direction from the front portion 3 toward the rear portion 7 is defined as a "longitudinal direction", and a direction orthogonal to the longitudinal direction is defined as a "lateral direction". It should be noted that the longitudinal direction is along the product length direction and the transverse direction is along the product width direction. Further, as shown in fig. 2, a direction orthogonal to the longitudinal direction and the transverse direction is defined as a "thickness direction", in which the side of the wearer's skin on which is located is defined as a "skin side", and the opposite side thereof is defined as a "non-skin side".

The diaper 1 includes a central belt-like region 12, side flaps 14, and leg side gathers 16. A pair of side flaps 14 are attached to the securing straps 30, respectively. These fastening tapes are joined with the first waistline portion such that a single waistline opening portion and a pair of leg opening portions are formed.

The central band-shaped region 12 is a band-shaped region that is composed of the front portion 3, the crotch portion 5, and the rear portion 7 and is located at the lateral center portion (see fig. 1). The central belt-like region 12 is a portion configured to absorb and hold urine and the like excreted by the wearer. The central band-shaped region 12 has a longitudinal shape (a shape along the longitudinal direction) including the absorbent body 21 having liquid retentivity. The central band-shaped region 12 mainly includes an absorbent body 21, a top sheet 22, a leakage preventing sheet 23, and a back sheet 24 (see fig. 2A to 2C).

The absorber 21 is a member formed in such a manner that: liquid absorbent materials enabling absorption of excreta such as urine are layered and disposed in the front portion 3, the crotch portion 5, and the rear portion 7. The hatched area in fig. 1 indicates an area corresponding to the absorber 21. The absorbent body 21 has an hourglass shape having a narrow width at a longitudinally central portion thereof. However, the absorber 21 is not limited to the shape shown in fig. 1, and may be a simple rectangle. Further, the absorber 21 may be provided at least in the crotch portion 5. The absorber 21 is disposed so as to be sandwiched between the top sheet 22 and the leakage preventing sheet 23. As the liquid absorbing material constituting the absorber 21, liquid absorbing fibers such as pulp fibers and/or liquid absorbing particulates such as super absorbent polymers can be used. Further, a liquid-absorbent material other than the liquid-absorbent fibers and the liquid-absorbent particulates may be included.

CL shown in fig. 1 is a line indicating the center of the diaper 1 in the longitudinal direction. In the diaper 1, the crotch portion 5 is positioned so that the center portion of the crotch of the wearer coincides with the center portion of the crotch portion 5. The center of the crotch of the wearer is the center position (groin) of the root of the leg, and is positioned to be shifted to the front side from the center position CL in the longitudinal direction of the diaper 1 (see fig. 1). Since the center portion of the crotch portion 5 is positioned on the front side with respect to the center position CL of the diaper 1, the wearer can easily move his/her legs to the front side (ventral side). Further, since the area of the rear portion 7 in the diaper 1 is relatively large, the buttocks of the wearer can be sufficiently covered.

The top sheet 22 is a liquid-permeable member disposed on the skin side of the absorbent body 21, and the top sheet 22 is made of, for example, a nonwoven fabric. The leakage-preventing sheet 23 is a liquid-impermeable member disposed on the non-skin side of the absorbent body 21, and is formed of, for example, a film. The back sheet 24 is disposed on the non-skin side of the leakage preventing sheet 23 (see fig. 2A to 2C). The back sheet 24 is a member (exterior sheet) constituting the exterior (exterior) on the non-skin side of the diaper 1, and is formed of, for example, nonwoven fabric.

The side flaps 14 are located on both lateral sides of the central band-shaped region 12. The side flaps 14 are formed so as to span the front portion 3, the crotch portion 5, and the rear portion 7 (see fig. 1). The length (width) of the side flap 14 in the transverse direction in the crotch portion 5 is smaller than the length (width) of the side flap 14 in the transverse direction in the front portion 3 and smaller than the length (width) of the side flap 14 in the transverse direction in the rear portion 7. Further, the length (width) of the side flap 14 in the lateral direction in the rear portion 7 is larger than the length (width) of the side flap 14 in the lateral direction in the front portion 3 (refer to fig. 1). Leg gathers 15 (leg hole stretch units) which can stretch and contract in the longitudinal direction are formed at both lateral end portions of the pair of side flaps 14.

Each side flap 14 is mainly composed of a skin side sheet 26 and a back sheet 24 (see fig. 2A to 2C). The skin-side sheet 26 is a member on the skin side formed so as to span the front portion 3, the crotch portion 5, and the rear portion 7, and is made of, for example, nonwoven fabric. The skin-side sheet 26 is also a member constituting the leg-side gathers 16 (three-dimensional gathers), and a portion on the outer side of the skin-side sheet 26 (a portion on the outer side of the joined portion 26A shown by a broken line in fig. 1) constitutes the side flap 14. The skin-side sheet 26 and the back sheet 24 are joined to each other by a hot-melt adhesive (hereinafter, also referred to as "HMA"). In addition, in a part of the side flaps 14, the leakage preventing sheet 23 is disposed so as to be sandwiched between the skin-side sheet 26 and the back sheet 24 (see fig. 2A to 2C).

The elastic member 27 is disposed between the skin-side sheet 26 and the back sheet 24 in the side flap 14. The elastic member 27 is a linear member that can expand and contract in the longitudinal direction, and imparts stretchability (elasticity) to each leg opening when the diaper 1 is worn. That is, the elastic member 27 is a leg-surrounding elastic member configured to fit the leg-surrounding portions to the legs of the wearer. The elastic member 27 imparts stretchability to the skin side sheet 26 and the back sheet 24 in the crotch portion 5, so that the leg gathers 15 are formed. In fig. 1, an elastic member 27 is provided in each of the pair of side flaps 14 along the longitudinal direction. However, the number and arrangement method of the elastic members 27 are not limited thereto, but can be appropriately adjusted as needed. The elastic member 27 is made of, for example, a rubber thread (rubber thread).

The leg side gathers 16 are three-dimensional gathers that prevent leakage of liquid from gaps in the periphery of each leg. A pair of leg side gathers 16 are formed in the front portion 3, the crotch portion 5, and the back portion 7 along the longitudinal direction (see fig. 1). The leg side gathers 16 are formed so as to cover both edges of the central belt-like region 12 on the inner side of the side flap 14.

The leg side gathers 16 are mainly formed of portions on the inner side of the skin side sheet 26 (see fig. 2). The inner edge of the skin-side sheet 26 in the crotch portion 5 has stretchability by means of rubber threads or the like. The skin-side sheet 26 is joined in the longitudinal direction at a joining portion 26A (a dashed line portion in fig. 1) between the central belt-like region 12 and each side flap 14. The region inside the joined portion 26A with respect to the skin-side sheet 26 constitutes leg side gathers 16 (three-dimensional gathers) with the joined portion 26A as a fulcrum.

The fixing tapes 30 are attached to the side flaps 14 (refer to fig. 1) of the rear portion 7, respectively. The fastening tape 30 is joined so that a part of the fastening tape 30 is sandwiched between the skin-side sheet 26 and the back sheet 24 constituting the side flap 14 (see fig. 2C).

The target tape 29 is provided on the front portion 3 of the diaper 1 (see fig. 1). The target tape 29 is disposed on the non-skin side of the front portion 3 (see fig. 2A). The target tape 29 is a member capable of being engaged with the fixing tape 30, and is formed of, for example, nonwoven fabric. The target tape 29 constitutes a target area for engagement of the fixing tape 30. It should be noted that the target area may be formed on the nonwoven fabric of the outermost layer of the back sheet 24 instead of disposing the target tape 29 on the non-skin side of the back sheet 24. The diaper 1 is worn in a state where the fixing tape 30 and the target tape 29 are joined.

Further, a tear-off line (tear-off line)17 shown by a thick dotted line in fig. 1 is provided to the side flap panel 14 in the rear portion 7, in other words, to the side of the side flap panel 14 where the tape fastener 30 is engaged. The tear-off line 17 will be described in detail later.

The product length (the dimension of the product in a state of being stretched in the longitudinal direction without wrinkles) in the longitudinal direction of the diaper 1 for low-weight infants according to the present embodiment is in the range of 210mm to 330 mm. For example, a diaper 1 for a low birth weight infant weighing less than 2500g has a product length of 310mm, a diaper 1 for a very low birth weight infant weighing less than 1500g has a product length of 270mm, and a diaper 1 for an ultra low birth weight infant weighing less than 1000g has a product length of 230 mm.

The waist size of the diaper 1 for a low-weight infant according to the present embodiment is in the range of 160mm to 295 mm. It should be noted that the waist size is a size in the following state: the end of one of the fastening tapes 30 is aligned with the end of the side flap 14 side in the hook sheet region C of the other fastening tape 30 and the product is stretched to be free from wrinkles. In other words, the waist size is a size in a state where the product is elongated in the width direction. For example, the waist size of the diaper 1 for low birth weight infants is 273.5mm and the waist size of the diaper 1 for very low birth weight infants weighing less than 1500g is 220 mm.

< application/removal of diaper 1 >

Next, a method of wearing/removing the diaper 1 will be explained. When the wearer is to wear the diaper 1, the diaper 1 in the unfolded state as shown in fig. 1 is configured such that the rear portion 7 in the central belt-like region 12 is along the back side of the wearer and the rear portion 3 is along the ventral side of the wearer. Then, the fastening tape 30 is engaged with the target tape 29 provided to the front portion 3, so that the side flap 14 in the rear portion 7 is wrapped around the wearer from the back side of the wearer to the abdominal side of the wearer in the girth direction.

Fig. 3 is a view showing a state in which a low-weight infant wears the diaper 1. As described above, the main subject of wearing the diaper 1 according to the present embodiment is a low-weight infant. When the wearer is a low-weight infant, in particular an extremely low-birth-weight infant (less than 1500g in weight) or an ultra-low-birth-weight infant (less than 1000g in weight), a "minimal handling" may be required to avoid contact with his/her body as much as possible, in order to keep the infant away from pressure. Therefore, after such a low-weight infant wears the diaper 1, it is desirable that the wearer be placed in a resting state that maintains: as shown in fig. 3, his/her back is rounded in a C-shape, and his/her legs are bent in an M-shape. Such a posture as shown in fig. 3 is close to the posture of the fetus in the mother (fetal bending posture), and is a posture that makes it easy for the wearer to rest, which is also referred to as "positioning posture".

When the diaper 1 is removed from the body of the wearer, the fixing tape 30 engaged with the target tape 29 is disengaged, so that the diaper 1 is unfolded in a reverse process to the wearing. However, when the wearer is in the oriented posture shown in fig. 3, the fastening tape 30 is hidden on the ventral side of the wearer. Therefore, in order to disengage the fastening tape 30, it is necessary to lie the wearer's body on the back at a time so that the wearer's ventral side can be seen. However, in view of the "minimum handling" point of view, it is not desirable to move the body of the wearer only for removing the diaper 1. Thus, in the diaper 1, the tear lines 17 are provided in the side flaps 14, so that the diaper 1 can be removed without moving the body of the wearer.

Fig. 4 is a diagram showing a state in which the diaper 1 is removed from the body of a wearer. When the diaper 1 is removed, the side flaps 14 are torn along the tear lines 17 from the waist opening portion to the respective leg opening portions. Thus, the diaper 1 can be removed from the wearer's body while the fixing tape 30 is joined to the target tape 29 on the ventral side. That is, as shown in fig. 4, the portions connected to the fastening tapes 30 are cut from the side flaps 14 at both lateral end portions of the diaper 1 so that the diaper 1 will be put into an unfolded state. Therefore, the diaper 1 can be simply removed without changing the posture of the wearer (low-weight infant).

< construction of tear line >

The detailed configuration of the tear line 17 provided in the diaper 1 will be explained.

Fig. 5A and 5B are diagrams respectively showing the configuration of the tear line 17 of the diaper 1. Such a tear line 17 according to the present embodiment is provided to the side flap 14 on the rear portion 7 side in the longitudinal direction, that is, to the side flap 14 on the side to which the fixed tape 30 is attached. The tear-off line is formed in a porous manner such that a plurality of holes 17h are arranged on a line extending from the waist opening portion to each leg opening portion. Such a hole 17h penetrates the skin-side sheet 26 and the back sheet 24 constituting each side flap 14 in the thickness direction, and also penetrates the leakage preventing sheet 23 in a part of this area. Fig. 5A shows an example of the circular hole 17h, and fig. 5B shows an example of the elliptical hole 17 h. It should be noted that the hole 17h may be formed in a shape other than the above-described shape, for example, may be formed as a rectangular slit or the like. The size of the hole 17h (the diameter of the opening) is determined by the size of the diaper 1 and/or the quality of the material constituting the skin-side sheet 26 and the like.

In fig. 5A and 5B, the rear portion 7 in the longitudinal direction of the diaper 1 is divided into three regions: a rear portion 7a, a rear portion 7b and a rear portion 7 c. The rear portion 7b is provided at a position substantially corresponding to the position of the fixing band 30 in the longitudinal direction. The rear portion 7a is a region located on the rear side in the longitudinal direction (longitudinally outside) with respect to the rear portion 7 b. The rear portion 7c is a region located on the front side in the longitudinal direction (the inner side in the longitudinal direction) with respect to the rear portion 7 b. The plurality of holes 17h of the tear-off line 17 form a linear portion in which the plurality of holes are linearly arranged in the region of the rear portion 7a and the rear portion 7b in the longitudinal direction along the joint 26A between the central band-shaped region 12 and the side flap 14. Further, the plurality of holes 17h are formed in a curved portion in which the plurality of holes are arranged in the region of the rear portion 7c so as to curve toward the respective leg opening portions at the lateral outer end portions of the diaper 1. Therefore, since each tear line 17 includes a linear portion and a curved portion, the side flap 14 can be easily cut off even in a state where the diaper 1 is worn. For example, when a wearer wearing the diaper 1 takes a positioning posture as shown in fig. 3, the legs of the wearer are bent in an M-shape to position the legs on the front side of the body, and thus the leg openings of the diaper 1 are located on the front side. In this state, when the side flap 14 is torn from the waistline opening to each leg opening, it is necessary to tear obliquely in the direction in which each leg is bent. On the other hand, in the diaper 1 according to the present embodiment, the tear lines 17 are bent toward the leg opening portions, respectively, and therefore, by tearing the side flaps 14 along the tear lines 17, even when the wearer takes a positioning posture, the portions corresponding to the fixing tape 30 can be easily cut off.

Further, the interval (pitch) between the holes 17h adjacent to each other on each tear-off line 17 varies with the area. Specifically, the interval Lhb between the outer periphery of one hole 17h in the area of the rear portion 7b and the outer periphery of the next hole 17h immediately adjacent thereto is larger than the interval Lha (Lhb > Lha) between the outer periphery of one hole 17h in the area of the

rear portions

7a and 7c and the outer periphery of the next hole 17h immediately adjacent thereto. In other words, the ratio of the holes 17h per unit length on the tear-off line 17 in the region of the rear portion 7b is smaller than the ratio of the holes 17h per unit length on the tear-off line 17 in the regions of the

rear portions

7a and 7 c. That is, the ratio of the holes penetrating the skin side sheet 26 and the back sheet 24 is small in the area of the rear portion 7b, and thus the side flap 14 is less likely to be cut off than in the areas of the

rear portions

7a and 7 c. This is to suppress the side flaps 14 from being torn by a force directed laterally outward acting on the region of the rear portion 7b when the fastening tape 30 is stretched laterally both sides when the diaper 1 is worn. In contrast, the side flap 14 is configured such that the side flap 14 is easier to tear in the region of the rear portion 7a where the side flap 14 starts to be torn and the rear portion 7c where the tear line 17 is bent, than the rear portion 7b when the diaper 1 is removed. Therefore, the side flap 14 is inhibited from being torn accidentally when the diaper 1 is worn, and the side flap 14 can be simply torn along the tear line 17 when the diaper 1 is removed.

< appearance of tear line >

The tear-off lines 17 are respectively arranged at positions which are easily visually recognized in the abdomen of the wearer when the diaper 1 is worn. When the diaper is worn, the side flaps 14 are subjected to a force that causes them to be stretched in the transverse direction. Therefore, a lateral force acts on the holes 17h constituting the tear line 17, so that the holes 17h are easily enlarged, which makes the holes 17h easily perceived in appearance. In particular, when the wearer is a low-weight infant and takes the positioning posture as shown in fig. 3, a force in the lateral direction is more easily exerted on the engaging portion of the fixing band 30 than in the supine position, which may cause the holes 17h arranged in a porous manner to be over-emphasized. When the hole 17h is excessively emphasized, the user will be given the impression of: the hole provided in the diaper 1 may cause a fear that excrement may leak from the hole 17h to the outside of the diaper 1, and may also cause a fear that the diaper 1 may be torn from the hole 17 h. This prevents the wearer from feeling relieved when using the diaper.

With respect to such a problem, in the diaper according to the present embodiment, even in the case where a lateral force acts on the side flap 14, the hole 17h of the tear line 17 is configured to be less noticeable.

Fig. 6 is an enlarged view showing a region of the rear portion 7b of fig. 5A. Fig. 7 is a view showing a section taken along line B-B of fig. 6. It should be noted that in fig. 6 and 7, each hole 17 is represented by a circle having a diameter D1, and the hole may be a shape other than a circle. Further, in fig. 6 and 7, the hole edge portions 17he are set in regions each having a predetermined width along the outer periphery (outer edge portion) of the hole 17h formed in the skin-side sheet 26, the leakage preventing sheet 23, and the back sheet 24, respectively. The hole edge portion 17he is provided so as to correspond to the plurality of holes 17h constituting the tear-off line 17. The distance w from the outer peripheral portion of each hole 17 to the outer peripheral portion of each hole edge portion 17he is, for example, about 0.1mm to 1.0 mm. In the following description, the leakage-preventing sheet 23 is referred to as a first sheet member, the skin-side sheet 26 is referred to as a second sheet member, and the back sheet 24 is referred to as a third sheet member.

A joining target region H where two sheets are joined is provided between the first sheet member and the second sheet member. Such a bonding target region H is a region indicated by a shaded portion in fig. 6 and 7. In the present embodiment, the band-shaped joining target regions H are provided in the longitudinal direction in the regions on both lateral sides of the tear-off line 17. That is, the bonding target region H is provided so as to surround the hole 17H. Then, an adhesive such as a Hot Melt Adhesive (HMA) is applied to a predetermined range in each of the joining target regions H between the two sheet members overlapped in the thickness direction to form a joining portion 50 for joining the two sheet members to each other. Likewise, each joining target area H is also provided between the first sheet member and the third sheet member to join the two sheets, so that the joined portion 50 is formed in the joining target area H.

In fig. 6 and 7, HMA is applied to the entire range in the joining target region H of at least one of the first sheet member and the second sheet member. That is, the joining portion 50 is formed in a substantially rectangular band shape along the longitudinal direction in a range equivalent to the joining target region H. In the present specification, such an HMA coating pattern is referred to as a "coater pattern". In the coater pattern, two sheet members can be firmly joined, and the coater pattern is suitable when a desired joining strength is ensured. However, the pattern of the joint 50 is not limited to the coater pattern, but various patterns of the joint 50 other than the coater pattern can be formed by changing the coating pattern of the HMA in the range of the joining target region H.

Fig. 8A to 8B are diagrams illustrating examples of other patterns of the joint 50. Fig. 8A shows an example when HMA is coated in a spiral-like manner in the range of the bonding target region H. In the present specification, such a coating pattern is referred to as a "spiral pattern". In the joint 50 formed in the spiral pattern, the amount of HMA used can be reduced compared to the coater pattern. Further, since the weight per unit area of the HMA in the joining target region H is reduced, the sheet is suppressed from being hardened by the HMA. Therefore, the joining target region H in the diaper 1 can be kept soft to the touch. Fig. 8B shows an example when HMA is coated in a meandering manner in the longitudinal direction within the range of the bonding target region H. In the present specification, such a coating pattern is referred to as an "omega pattern (omega pattern)". In the joint 50 formed in the omega pattern, as in the case of the spiral pattern, the amount of HMA used can be reduced, and thus the soft touch of the joining target region H can be maintained.

As shown in fig. 7, in the diaper 1 according to the present embodiment, the joint portion 50 and the hole edge portion 17he are formed at positions where the joint portion 50 and the hole edge portion 17he do not overlap each other in the lateral direction. In other words, the hole edge portions 17he are not joined to each other between the first sheet member (the leakage preventing sheet 23) and the second sheet member (the skin-side sheet 26) nor between the first sheet member (the leakage preventing sheet 23) and the third sheet member (the back sheet 24). Therefore, even when the side flap 14 is stretched in the transverse direction, the hole 17h of the tear line 17 can be made less noticeable.

Fig. 9 is an explanatory diagram showing a state of the hole 17h when a lateral force acts in fig. 7. When a force that stretches the side flap 14 in the transverse direction acts, a shift in the shearing direction occurs in the first to third sheet members as shown in fig. 9. Meanwhile, a force in a direction of increasing the diameter of the opening portion of the hole 17h acts on the hole 17h formed in each sheet member, thereby increasing the diameter of the hole 17h, which is represented by D1 in fig. 7 to D2 in fig. 9 (D2> D1).

Here, the hole edge portion 17he provided around the hole 17h of the first sheet member and the hole edge portion 17he provided around the hole 17h of the second sheet member are not engaged with each other, and thus the lateral position of the hole 17h is shifted between the two sheet members. Likewise, the lateral position of the hole 17h is also offset between the first sheet member and the third sheet member. As a result, in the hole 17h, the diameter D3 of the region penetrating the first to third sheet members in the thickness direction is made smaller than the diameter D2(D2> D3). Therefore, even when the side flap 14 is stretched in the transverse direction so that the diameter of such a hole 17h increases to D2, the diameter of the portion that can be actually regarded as a penetrating portion becomes D3, and the hole 17h does not appear to be enlarged in appearance. It should be noted that fig. 9 illustrates a case where a force uniform in the lateral direction acts on the first to third sheet members. In fact, when the side flap 14 is stretched in the transverse direction, the force acting on the sheet member is often uneven and the amount of offset of the position of the hole 17h in the transverse direction is varied, which makes the enlargement of the hole 17 less noticeable. This makes the tear-off line 17 less noticeable, and can give the user less uneasiness.

It should be noted that the skin-side sheet 26 and the back sheet 24, which are respectively located on both outer sides in the thickness direction, are composed of nonwoven fabric. In general, fine fibers are arranged on the surface of a nonwoven fabric in an entangled manner, and thus the surface becomes a fluffed state. Therefore, the hole edge portions 17he of the holes 17h formed in the skin-side sheet 26 and the back sheet 24 also become a fluffed state, which makes the outer edges (edges) of the holes 17h less noticeable. Therefore, the sheet member (the second sheet member and the third sheet member in the above example) arranged on the outer side among the plurality of overlapped sheet members is composed of nonwoven fabric or the like, which can make the holes 17h less noticeable.

Further, in fig. 6 and 7, the engagement target region H is located at a position spaced apart from the hole edge portion 17 he. However, the joining target region H and the hole edge portion 17he may be set in an overlapping manner as long as the joining portion 50 and the hole edge portion 17he have regions that do not overlap with each other in the lateral direction. Fig. 10 is an explanatory diagram showing an example when the joining target region H and the hole edge portion 17he overlap with each other. In fig. 10, the joint 50 is formed in an omega pattern (or a spiral pattern) in the joint target region H. In this case, with at least the hole 17h3 of 5 holes of the holes 17h1 to 17h5 shown in fig. 10, the hole edge portion 17he and the engaging portion 50 do not overlap with each other. Therefore, even in the case where the side flap 14 is stretched in the transverse direction, the portion corresponding to the hole 17h3 can be seen so that the diameter of the opening portion does not expand as illustrated in fig. 9. Therefore, the tear line 17 can be less noticeable.

Therefore, in the present invention, a configuration may be adopted such that at least one of the engaging portion 50 and the hole edge portion 17he of the overlapped sheet members are engaged not to overlap with each other. Therefore, the hole 17h penetrating the sheet member is not easily visually recognized, so that the tear-off line 17 is hardly noticeable.

< modification example >

In the above-described embodiment, the example in which the hole edge portion 17he and the joint portion 50 do not overlap each other between the respective first to third sheet members has been described. However, as long as the hole edge portion 17he and the engaging portion 50 do not overlap in two overlapped sheet members of the three sheet members, the tear-off line 17 can be less easily perceived with respect to that portion.

Fig. 11A and 11B are explanatory diagrams illustrating an example of a case where the hole edge portion 17he and the joint portion 50 overlap between the first sheet member and the second sheet member. In fig. 11A, the hole edge portion 17he and the joint portion 50 do not overlap each other between the first sheet member (the leakage preventing sheet 23) and the third sheet member (the back sheet 24), and the hole edge portion 17he and the joint portion 50 overlap between the first sheet member (the leakage preventing sheet 23) and the second sheet member (the skin-side sheet 26). Fig. 11B illustrates a case where a lateral force acts on the sheet member in the state of fig. 11A. In this case, a shift in the lateral position of the hole 17h as illustrated in fig. 9 occurs between the first sheet member and the third sheet member. On the other hand, since the hole edge portions 17he, which are the outer edge portions of the holes 17h, are joined to each other between the first sheet member and the second sheet member, the amount of deviation in the lateral position of the holes 17h is small. Therefore, the hole 17h is easily perceived. That is, the tear line 17 is hardly noticeable when the diaper 1 is viewed from the non-skin side (back sheet 24 side), whereas the tear line 17 can be perceived when the diaper 1 is viewed from the skin side (skin side sheet 26 side).

According to the modification, the diaper 1 in which the tear line 17 is less visible from the outside (non-skin side) and the tear line 17 is easily visible from the inside (skin side) can be configured. With this structure, when removing the diaper 1, the position of the tear-off line 17 is easily grasped by lifting up the side flap 14 to check the inside. Therefore, the tear line 17 can be less visually recognized, and the position of the tear line 17 can be easily recognized from the inside.

Such a configuration may also be such that the hole edge portion 17he and the joint portion 50 overlap each other between the first sheet member (the leakage preventing sheet 23) and the third sheet member (the back sheet 24), while the hole edge portion 17he and the joint portion 50 do not overlap each other between the first sheet member (the leakage preventing sheet 23) and the second sheet member (the skin-side sheet 26).

Further, in the above-described embodiment, the tear line 17 penetrating the three sheet members has been described. However, the same effect can be achieved even if the tear line 17 penetrates only two sheet members. For example, in the rear portion 7c of fig. 5A and 5B, a part of the tear line 17 passes through a portion where two sheet members of the skin-side sheet 26 (referred to as a first sheet member) and the back sheet 24 (referred to as a second sheet member) overlap with each other. That is, the holes 17h are formed in portions where the leakage preventing sheets 23 do not exist. In this case, a configuration is adopted such that at least one hole edge portion 17he does not overlap with the joining portion 50 joining the first sheet member and the second sheet member, so that the enlargement of the hole 17h in this portion can be less visually recognized, which can make the tear-off line 17 less noticeable.

The term "other" means

Such embodiments as described above are for the convenience of understanding the present invention and are not to be construed as limiting the present invention in any way. Needless to say, various changes or modifications may be made to the present invention without departing from the spirit thereof, and equivalents thereof are encompassed.

In the above embodiment, the tear line 17 is formed on the rear portion 7 side of the diaper 1, and the tear line(s) may be formed in other portions. In fig. 1, tear lines 19 belonging to one type of tear line are respectively formed in the longitudinal direction from the longitudinal end portion on the front portion 3 side of the side flap 14. Each tear line 19 is constituted by a plurality of holes 19h penetrating through a sheet member(s) such as the skin-side sheet 26, like the tear line 17. Further, a hole rim portion 19he (not shown in fig. 1) is formed around the periphery of the hole 19 h. Then, a configuration is adopted such that the engaging portion 50 that engages two overlapped sheet members and the hole edge portions 19he adjacent to each other do not overlap with each other, so that the tear line 19 can be made less noticeable as in the case of the tear line 17.

Since such tear line 19 is formed in the front portion 3 of the diaper 1, that is, in the ventral side of the waist portion (first waist portion 3), the ventral side of the diaper 1 can be easily torn along the tear line 19 when the diaper 1 is worn. By folding back such a tear portion, the abdomen of the wearer can be exposed when the diaper 1 is worn. In the case where the wearer of the diaper 1 is a low-weight infant, it is desirable to irradiate light over a wide range of his/her body when performing phototherapy or the like. In this case, by tearing the abdomen side of the diaper 1 along the tear line 19 to fold it back, it is possible to irradiate light over a wide range of the abdomen while keeping as little contact with the body of a low-weight infant as possible. Further, since the tear line 19 is provided at the position shown in fig. 1, the first waist portion 3 of the diaper 1 can be easily folded along the roundness of the wearer's abdomen based on the tear line 19, and thus the fit of the diaper 1 can be improved.

It should be noted that the tear-off line 17 and the tear-off line 19 are formed at substantially the same position in the lateral direction of the diaper 1 in the developed state, respectively (refer to fig. 1). When the diaper 1 is manufactured, a plurality of sheet members in the state of fig. 1 are conveyed in the longitudinal direction in a continuous and connected manner. That is, the diaper 1 in the developed state is conveyed in the longitudinal direction in a state where the longitudinal front end portion of the diaper 1 is connected to the longitudinal rear end portion of another diaper 1. Thus, during transport, a plurality of holes are punched in the diaper 1 in the longitudinal direction in a manner spanning the connecting portion, so that the tear-off line 19 and the tear-off line 17 are formed in a continuous manner, respectively. That is, since the tear line 19 can be formed simultaneously with the formation of the tear-off line 17, there is no problem such as an increase in manufacturing cost.

Further, the diaper 1 may have the following aspects.

(aspect 1)

A disposable diaper characterized in that leg-surrounding elastic members for contracting portions corresponding to respective leg openings are provided in the longitudinal direction at respective positions on both sides in the transverse direction, and

when the curved portion of each tear line is virtually divided into two portions, that is, the waist opening portion side portion and the leg opening portion side portion, and when the leg hole elastic members are viewed from the thickness direction of the diaper, the leg hole elastic members intersect with the waist opening portion side portion of the curved portion.

(aspect 2)

A disposable diaper is characterized by comprising a plurality of sheet members stacked in a thickness direction, wherein the number of the sheet members stacked in at least a part of a curved portion of each of the tear lines is smaller than the number of the sheet members stacked in a linear portion of each of the tear lines.

(aspect 3)

A disposable diaper is characterized in that it comprises a resin film (leak-proof sheet) whose extending direction at the time of manufacture is along the longitudinal direction, and the linear portion of each tear line 17 is formed of the resin film

(aspect 4)

A disposable diaper having a sheet-like three-dimensional gather (leg side gather) forming portion provided in a longitudinal direction at each position on both sides in a transverse direction; the three-dimensional gather forming portion includes a base end portion that is not able to rise in the thickness direction, and a rising portion that is able to rise on the skin side in the thickness direction with the base end portion as a fulcrum, the base end portion and the rising portion being juxtaposed in a lateral direction; the standing portion is configured to contract in the longitudinal direction based on a contraction force in the longitudinal direction acting on the standing portion, so that the standing portion stands up on the skin side in the thickness direction; the tear line is formed at a position laterally outward of the standing portion and the proximal portion.

(aspect 5)

A disposable diaper characterized by comprising an absorbent core (absorber) at the center in the lateral direction, the absorbent core being formed such that liquid absorbent materials that absorb liquid are laminated in the thickness direction, wherein the tear-off line is formed at a position outside the lateral direction with respect to the absorbent core.

Description of the reference numerals

1a disposable diaper (diaper),

3 front part (first waist part),

5a crotch part of the human body,

7 (second waist body part),

12 in the central zone of the strip, and,

the side flap(s) of (14),

15 the side of the leg gather is pleated,

the side gather of the leg 16 is provided with,

tearing off the line 17h, forming 17h holes 17h 1-17 h5 holes 17he at the edge of the hole,

19 tear line, 19h hole, 19he hole edge,

21 an absorbent body for absorbing the liquid, the absorbent body,

22 a top sheet of material having a first surface,

23 of a leakage-preventing sheet material,

24 back sheet (outer sheet),

26a skin-side sheet of a material,

27 an elastic member for elastically urging the elastic member to a predetermined position,

a 29-mesh belt is provided,

30 fixing the belt at the position of 30,

50 of the at least one engaging portion of the first,

h to engage the target area(s),

HMA hot melt adhesive.

Claims

1. A disposable diaper including a first waist portion, a crotch portion, and a second waist portion arranged in a longitudinal direction, the disposable diaper comprising:

a side flap configured such that a first sheet member and a second sheet member overlap each other;

a tape fastener which is joined to the second waistline portion side of the side flap;

a tear line provided on the second waistline portion side of the side flap, the tear line being formed by a plurality of holes arranged to penetrate the first sheet member and the second sheet member,

the first sheet member includes a plurality of hole edge portions corresponding to the plurality of holes, each hole edge portion being along an outer periphery of each hole,

the plurality of hole edge portions include at least one hole edge portion that does not overlap with a joining portion that joins the first sheet member and the second sheet member that overlap with each other,

the disposable diaper is configured such that the tape fastener can be torn by tearing the side flap along the tear-off line, the tape fastener is joined to the first waistline portion to form a single waistline opening portion and a pair of leg opening portions, and the plurality of holes included in the tear-off line are aligned on a course extending from a portion constituting the waistline opening portion to a portion constituting the leg opening portions.

2. The disposable diaper according to claim 1, further comprising:

a third sheet member that overlaps the first sheet member on a face of the first sheet member opposite to the side on which the second sheet member is located, wherein

At least one of the plurality of hole edge portions overlaps neither a joining portion joining the first sheet member and the second sheet member nor a joining portion joining the first sheet member and the third sheet member.

3. The disposable diaper according to claim 1, further comprising:

At least one of the plurality of hole edge portions overlaps with a joining portion joining the first sheet member and the second sheet member, and does not overlap with a joining portion joining the first sheet member and the third sheet member.

4. The disposable diaper according to claim 2 or 3,

at least one of the first sheet member and the third sheet member is formed of a nonwoven fabric.

5. The disposable diaper according to claim 1,

the joining portion is formed such that a hot melt adhesive is applied to at least one of the first sheet member and the second sheet member in a spiral manner.

6. The disposable diaper according to claim 1,

a ratio of the hole per unit length in a direction in which the tear line extends in an area corresponding to an area where the fastening tape is disposed in the longitudinal direction is smaller than a ratio of the hole per unit length in the direction in which the tear line extends

A ratio of the holes per unit length in a direction in which the tear line extends in a region corresponding to a region where the fastening tape is not disposed in the longitudinal direction.

7. The disposable diaper of claim 1 wherein the tear line comprises:

a linear portion extending in the longitudinal direction from a portion constituting the waistline opening portion; and

a curved portion that is curved toward the outside in the lateral direction orthogonal to the longitudinal direction at a position inside in the longitudinal direction of the linear portion.

8. The disposable diaper according to claim 1, further comprising:

a tear line provided on the first waistline portion side of the side flap at the same position as the tear line in a transverse direction orthogonal to the longitudinal direction, the tear line being formed by a plurality of holes arranged to penetrate the first sheet member and the second sheet member.