CN107106377B

CN107106377B - Disposable diaper having a disposable diaper

Info

Publication number: CN107106377B
Application number: CN201580071190.9A
Authority: CN
Inventors: 卫藤友美; 中嶋海阳; 田中嘉则
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2014-12-26
Filing date: 2015-12-25
Publication date: 2020-09-08
Anticipated expiration: 2035-12-25
Also published as: JPWO2016104750A1; KR20170098229A; CN107106377A; JP6479046B2; WO2016104750A1

Abstract

A disposable diaper capable of being easily pulled up when worn. In a disposable diaper (10) provided with a diaper main body (16) and a pair of waist belts (17) for connecting a front waist region (11) and a rear waist region (12), the pair of waist belts (17) are joined to the diaper main body (16) at the front waist region (11) and the rear waist region (12) by joining lines (18A, 18B) having a smaller interval from the leg opening (15) side toward the waist opening (14) side. A high-rigidity region (40) extending in the girth direction and having a rigidity higher than the rigidity of the other regions of the waist belt (17) is located at the edge of the waist belt (17) on the side of the waist opening (14).

Description

Disposable diaper having a disposable diaper

Technical Field

The present disclosure relates to disposable diapers.

Background

Conventionally, there is known a disposable diaper including: a diaper main body having an absorber, the diaper main body having a front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region; a pair of waist belts for connecting the front waist region and the rear waist region; the waist is opened; and a pair of leg openings. For example, in a disposable diaper disclosed in patent document 1, a pair of waist belts are joined to a diaper main body via a joining line that is closer to a longitudinal centerline from a leg opening side toward a waist opening side.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 9-10261

Disclosure of Invention

Problems to be solved by the invention

The diaper described in patent document 1 can give a preferable impression as underwear to a wearer as compared with a diaper in which the front waist region and the rear waist region are formed by an endless waist belt and a diaper in which the front waist region, the rear waist region and the crotch region are formed by an integral sheet member, but has a problem that it is difficult to pull up the diaper when the diaper is worn. In the diaper of patent document 1, the rigidity of the waist belt is substantially uniform over the entire area, and when the diaper is pulled up with the waist belt being worn, a force applied to the waist belt acts as a force that extends the waist belt in the longitudinal direction to expand the waist opening, making it difficult to perform the operation of pulling up the diaper.

The present invention is an improvement of the prior art, and an object of the present invention is to provide a disposable diaper capable of being easily pulled up when worn.

Means for solving the problems

A disposable diaper of the present invention has a longitudinal direction and a transverse direction, and a longitudinal centerline that bisects the dimension in the transverse direction, and includes: a diaper main body having an absorber, the diaper main body having a front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region; a pair of waist belts for connecting the front waist region and the rear waist region; the waist is opened; and a pair of leg openings.

In the diaper of the present invention, the pair of waist belts are joined to the diaper main body at the front waist region and the rear waist region by joining lines whose distance from the leg opening sides to the waist opening side is smaller, and a high rigidity region of the waist belt extending in the girth direction and having a rigidity higher than that of the other regions is located at an edge of the waist belt on the waist opening side.

The waist belt further includes the high-rigidity region extending along the edge of the leg opening and having a rigidity higher than that of the other region, and therefore, the waist belt can suppress the floating at the edge of the leg opening and prevent the side leakage of excrement.

Since both ends of the high rigidity region are located at the joining line joined to the diaper main body, it is possible to prevent sheet breakage at the intersection between the waist belt and the diaper main body.

The waist belt has a waist sheet, and the high-rigidity region is formed by bending and fixing a part of the waist sheet to an inner surface side or an outer surface side.

The waist piece includes: an inner layer on the skin-facing side; an outer layer on a non-skin-facing side; and a plurality of waist elastic bodies attached between the inner layer and the outer layer, the waist elastic bodies not overlapping in a thickness direction of the waist panel in the high rigidity region.

The waist belt has a waist panel, and the high rigidity region is formed by disposing an elastic or inelastic auxiliary sheet independent of the waist panel.

The auxiliary sheet is disposed on at least one of the skin-facing surface side and the non-skin-facing surface side of the waist belt, thereby imparting rigidity to the waist-opening edge portion, facilitating the hooking of fingers when pulling up by gripping the waist-opening edge portion, and suppressing the occurrence of sheet breakage during pulling up.

Since the width of the high-rigidity region is 3mm to 30mm, the high-rigidity region can be stably held during pulling up.

The width dimension of the high rigidity region is different in the longitudinal direction of the waist band and is largest at a position overlapping the join line, and therefore, sheet breakage at the join line can be effectively prevented.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one or more embodiments of the disposable diaper of the present invention, the high rigidity region extending in the girth direction is located at the edge of the waist belt on the side of the waist opening, and therefore the diaper is easily bent at the boundary between the high rigidity region and the other region, and when the diaper is worn, the fingers can be hooked to the boundary to easily pull up the waist belt.

The drawings show specific embodiments of the present invention disclosed herein, including not only the indispensable structure of the invention but also alternative and preferred embodiments.

Drawings

Fig. 1 is a perspective view of a diaper showing an example of a disposable diaper according to embodiment 1 of the present invention.

Fig. 2 is a plan view of a diaper extended in the longitudinal and transverse directions and in a state in which the inner surface of the waist belt and the inner surface of the diaper main body are in contact with each other.

Fig. 3 is an expanded plan view of the diaper in which the joining line between the front and rear waist regions of the diaper is released and the diaper main body and the waist belt are extended in the longitudinal and lateral directions.

Fig. 4 is a sectional view taken along line IV-IV of fig. 2.

Fig. 5 (a) is a partially enlarged view of the region surrounded by the line v (a) of fig. 3. Fig. 5 (b) is a partially enlarged view of the region surrounded by the line v (b) of fig. 3.

Fig. 6 is a front view of the diaper in a contracted state in which the inner surface of the front waist region and the inner surface of the rear waist region are in contact with each other.

Fig. 7 is a front view showing a state when the diaper is worn.

Fig. 8 is a side view of the diaper of the present invention in a worn state.

Fig. 9 (a) to 9 (d) are views showing a part of the diaper manufacturing process.

Fig. 10 (a) is a sectional view taken along line x (a) of fig. 9 (a). Fig. 10 (b) is a sectional view taken along line x (b) of fig. 9 (d).

Fig. 11 is a perspective view of the diaper in embodiment 2.

Fig. 12 is an expanded plan view of the diaper of embodiment 2 in which the joining line between the front and rear waist regions is released and the diaper main body and the waist belt are extended in the longitudinal and lateral directions.

Fig. 13 is an expanded plan view of the diaper of embodiment 3 in which the joining line between the front and rear waist regions is released and the diaper main body and the waist belt are extended in the longitudinal and lateral directions.

Detailed Description

The embodiments described below relate to a disposable diaper shown in fig. 1 to 13 as an example of the present invention, and include not only an indispensable configuration of the invention but also an alternative and preferable configuration. In fig. 2 to 4, 12, and 13, each elastic body discussed later is in the following state: the member having the elastic bodies attached thereto is stretched against the contraction force thereof to such an extent that the gathers of the member having the elastic bodies attached thereto due to the contraction force in the lateral direction X and the longitudinal direction Y appear to be substantially disappeared by natural vision. In the description of the method of attaching the elastic body, the elastic body is attached in a contractible manner in an extended state, and in the description of the state (object) in which the elastic body is attached, the elastic body is attached in an extendable manner. Thus, the latter is understood to mean the result of the former.

< embodiment 1 >

Referring to fig. 1 to 3, a diaper 10 as an example of a disposable diaper of the present invention includes: a longitudinal direction Y and a transverse direction X orthogonal to the longitudinal direction Y; a non-skin-facing surface opposite to the skin-facing surface; a longitudinal center line P for bisecting the length dimension in the transverse direction X; the diaper 10 includes a front waist region 11, a rear waist region 12, and a crotch region 13 located between the front waist region 11 and the rear waist region 12, and a transverse centerline Q bisecting the length dimension in the longitudinal direction Y. The diaper 10 is generally symmetrical about a longitudinal centerline P and has a waist opening 14 and a pair of leg openings 15.

The diaper 10 includes: a diaper main body 16 having an absorber 23 extending in the longitudinal direction Y; and a pair of waist belts 17 for connecting the front waist region 11 and the rear waist region 12. The pair of waist belts 17 are disposed substantially symmetrically with respect to the longitudinal centerline P, and are joined to the diaper main body 16 by joining lines (seal lines) 18A, 18B formed of a plurality of independent seal portions, which are located closer to the longitudinal centerline P from the leg openings 15 side toward the waist opening 14 side. The sealing portion is formed by a known bonding means, for example, various thermal bonding means such as hot embossing and sonic processing. At the

joining lines

18A, 18B, the skin-facing surface of the waist belt 17 and the skin-facing surface of the diaper main body 16 are fixed to each other. By having this joining form, the

joining lines

18A, 18B do not contact the body of the wearer and cause discomfort or irritation. As long as the effects of the present embodiment described later are obtained, the

bonding wires

18A and 18B can use a known bonding means such as a hot-melt adhesive, in addition to a thermal bonding means. The waist belt 17 is formed of a pair of elastic sheets (japanese: パネル), but may be formed of the same sheet material as the diaper main body 16 by a manufacturing method described later.

< diaper main body >

Referring to fig. 3 to 5, the diaper main body 16 is defined by a front end edge 16a and a rear end edge 16b which are separated and opposed in the longitudinal direction Y and both

side edges

16c, 16d which are separated and opposed in the lateral direction X, and the diaper main body 16 includes: a front end portion 20A located between the front edges 16 a; a rear end portion 20B located between the rear edges 16B; and an intermediate portion 20C located between the front end portion 20A and the rear end portion 20B. The front end edge 16a and the rear end edge 16b are substantially symmetrical with respect to the longitudinal center line P and extend in a convex shape outward in the longitudinal direction Y. The front end portion 20A is located in the front waist region 11 of the diaper 10, the rear end portion 20B is located in the rear waist region 12 of the diaper 10, and the intermediate portion 20C is located in the crotch region 13.

The diaper main body 16 includes: a liquid-permeable inner sheet 21 positioned on the skin-facing surface; a liquid-impermeable outer sheet 22 positioned on the non-skin-facing surface; an absorber 23 positioned between the inner sheet 21 and the outer sheet 22; and a liquid-impermeable or liquid-impermeable leakage-preventive sheet 24 positioned between the absorbent body 23 and the outer sheet 22. A pair of side sheets 25 are disposed on both sides of the inner layer sheet 21 and the outer layer sheet 22, and the pair of side sheets 25 are spaced apart from each other in the transverse direction X and extend in the longitudinal direction Y in a state of being interposed between the inner layer sheet 21 and the outer layer sheet 22.

The inner layer sheet 21 has a generally octagonal shape, preferably having a mass of about 15g/m²～35g/m²Preferably about 18g/m²～24g/m²The hydrophilic-treated hydrophobic through-air fiber nonwoven fabric, spunbond fiber nonwoven fabric, point-bonded fiber nonwoven fabric, and the like. The outer layer sheet 22 and the inner layer sheet 21 have substantially the same shape and the same size, and have a mass of about 15g/m²～30g/m²Preferably about 18g/m²～24g/m²The hydrophobic spunbond/hot melt/spunbond (hereinafter referred to as SMS) fiber nonwoven fabric or spunbond fiber nonwoven fabric.

The absorbent body 23 has a front end edge 23a and a rear end edge 23b which are curved convexly outward in the longitudinal direction Y, and both side edges 23c extending along the longitudinal direction Y between the front end edge and the rear end edge, and includes a liquid-absorbent core shaped into a desired shape and a liquid-diffusing core covering sheet such as tissue paper which covers the liquid-absorbent core. As the liquid-absorbent core, wood fluff pulp, superabsorbent polymer particles, or a mixture thereof can be used. The liquid-absorbent core and the core covering sheet can be joined to each other by a known joining means such as a hot melt adhesive.

The leakproof sheet 24 is disposed so as to cover at least the entire non-skin-facing surface (bottom surface) of the absorbent body 23, and can be joined to the outer sheet 22 by a known joining means such as a hot melt adhesive. The leakproof sheet 24 can be, for example, a liquid-impermeable, preferably liquid-impermeable and air-permeable plastic film, and the leakproof sheet 24 covers the entire non-skin-facing surface of the absorbent body 23, thereby preventing body fluid absorbed by the absorbent body 23 from leaking to the outside of the diaper 10. Although not shown, the leakproof sheet 24 may be formed of a sheet having decorative elements such as patterns and colors, and the decorative elements may be made to transmit through the outer sheet 22 having a desired light transmittance.

Referring to fig. 4 and 5, the pair of side sheets 25 are disposed on both sides of the absorber 23 in the transverse direction X, and are joined between the leakproof sheet 24 and the inner sheet 21 by a known joining means such as a hot melt adhesive. The side sheet 25 is formed of a 1 st sheet 25A located on the absorbent body 23 side and a 2 nd sheet 25B located on the outer sheet 22 side, and the two

sheets

25A and 25B are joined by a known means such as a hot melt adhesive. As the side sheet 25, for example, a sheet having a mass of about 10g/m can be used²～30g/m²A hydrophobic SMS fiber nonwoven fabric or a spunbond fiber nonwoven fabric.

Further, a plurality of leg elastic members 26 extending in the longitudinal direction and leg elastic members 27 positioned on the skin-facing surface side of the leg elastic members 26 are disposed between the outer edge of the 1 st sheet 25A and the outer edge of the 2 nd sheet 25B. The leg elastic members 26 are formed of a plurality of thread-like or strand-like elastic members that are attached so as to be contractible in an extended state along the longitudinal direction Y between the front end edge 16a and the rear end edge 16b of the diaper main body 16. The leg elastic sheet 27 is a belt-like elastic member, and is formed of a rubber flat belt or an elastically stretchable fiber nonwoven fabric made of elastic fibers. Leg elastic regions 40 are formed on the outer portions of both side edges 23c of the absorbent body 23 in the lateral direction X by disposing the leg elastic members 26 and the leg elastic pieces 27 on both side portions of the diaper main body 16. The leg elastic regions 40 extend from the juncture line 18A at the front waist region 11 to the juncture line 18B at the rear waist region 12. In the present embodiment, the side sheet 25 is formed of two

sheets

25A and 25B, but may be formed by folding and fixing a single fiber nonwoven fabric, or may be formed of an extended portion of the outer sheet 22.

< waist Belt >

Referring to fig. 2 and 3, the waist belt 17 has both end edges (front end edge and rear end edge) 17a and 17B joined to the diaper main body 16 by joining

lines

18A and 18B, a lower side edge 17c forming the leg opening 15 together with both side edges 16c and 16d of the diaper main body 16, and an upper side edge 17d forming the waist opening edge. The waist belt 17 is divided into an upper portion 51 located on the waist opening side (1 st side edge side) and a lower portion 52 located on the leg opening side (2 nd side edge side). The width-directional dimensions of the upper and lower portions are about 30% to 70%, and preferably have a magnitude of 50%, of the width dimension W1 of the waist belt 17, respectively. Therefore, for example, in the case of the M size of a typical adult diaper, the width W1 of the waist belt 17 is about 70mm, and the width of the upper and

lower portions

51, 52 is about 35 mm.

The waist belt 17 has an inner layer 31 and an outer layer 32 formed of a waist panel 30 made of a fibrous nonwoven fabric. A plurality of waist

elastic members

33, 34 made of a string-like or strand-like elastic material are attached between the inner layer 31 and the outer layer 32 so as to be contractible in an extended state. The waist

elastic bodies

33, 34 include an upper waist elastic body 33 disposed in the upper portion 51 and a lower waist elastic body 34 disposed in the lower portion 52.

Referring to fig. 2 to 4, since the leg elastic bodies 26 and the upper waist elastic body 33 are arranged so as not to overlap each other in the thickness direction Z, the tensile force generated by the

elastic bodies

26 and 33 can be suppressed from concentrating on a point at the joining line 18, and the diaper can be made more difficult to break. In addition, in the plan view shown in fig. 2, a part of the leg elastic members 26 is positioned further outward in the lateral direction X than the upper waist elastic member 33, and thus the leakage of excrement from the leg opening edge portions can be effectively prevented.

A waist elastic sheet 35 formed of an elastic fiber nonwoven fabric is disposed on the lower side edge 17c side of the waist sheet 30. The waist elastic sheet 35 is disposed so that a part thereof overlaps the lowermost lower waist elastic body 34. Further, a part of the waist panel 30 is folded inward on the side of the upper side edge 17d, and the folded state is fixed by an adhesive such as a hot melt adhesive. A plurality of upper waist elastic members 33 are disposed at the bent portions 36. In addition, it is preferable that the upper waist elastic body 33 disposed in the bent portion 36 and the upper waist elastic body 33 disposed in the body portion other than the bent portion 36 in the waist panel 30 are offset in the thickness direction. This avoids concentration of elongation stress caused by the upper waist elastic body 33 overlapping in the thickness direction, and the entire waist opening edge portion where the bent portion 36 exists has higher elongation stress than other regions, and the elastic body exerts its stretching force to the boundary with the joining

lines

18A and 18B, so that high fit with the waist portion of the wearer is achieved, and slipping-off due to movement of the wearer and the weight of the wearer after absorption of excrement can be reduced. Further, since the bent portion 36 is located at the waist opening edge portion, the light transmittance is locally lowered, and the underwear-like appearance is obtained like pants.

The region where the bent portion 36 is located forms a high rigidity region 50 having rigidity higher than that of the other region of the lumbar belt 17 (hereinafter referred to as a low rigidity region 43). In the high rigidity region 50, the rigidity can be further improved by arranging another sheet or adjusting the pitch or number of the upper waist elastic members 33 arranged in the bent portions 36. In the low rigidity region 43, the region in which the waist elastic sheet 35 is disposed can be said to have higher rigidity than the portion formed by only the inner layer 31 and the outer layer 32, but the number of sheets stacked is smaller than the number of sheets stacked in the high rigidity region 50, and the rigidity can be said to be lower than the rigidity of the high rigidity region 50, and therefore, here, the region is referred to as a portion of the low rigidity region 43.

In the present embodiment, 10 upper waist elastic bodies 33 are disposed in the upper portion 51 of the waist belt 17, and 6 upper waist elastic bodies 33 (including elastic bodies disposed in the bent portions 36) disposed on the side of the waist opening have a thickness of 450dtex to 500dtex and are fixed in a state of being extended by 3.0 to 3.5 times. The 4 elastic members of the upper waist elastic member 33 disposed on the leg opening side have a thickness of 600dtex to 650dtex and are fixed in a state of being stretched 2.5 times to 3.0 times. 7 lower waist elastic bodies 34 are arranged in the lower portion 52, and the lower waist elastic bodies 34 are fixed in a state of being stretched 2.5 to 3.0 times, with a thickness of 600dtex to 650 dtex. The interval (separation dimension) between the upper waist elastic body 33 and the lower waist elastic body 34 is equal, and is 5.0mm to 6.0 mm.

As the leg elastic sheet 27, a belt-like elastic sheet made of an elastically stretchable nonwoven fabric of fibers, a polyurethane sheet, or the like can be used. By disposing the leg elastic sheet 27 at the leg opening edge portion, the leg elastic region 40 is attached to the body of the wearer in a planar manner, side leakage can be effectively prevented, and generation of rubber marks due to the entanglement of elastic threads or the like can be prevented. Further, by disposing the leg elastic pieces 27, a high rigidity region having rigidity higher than that of the portion constituted only by the side piece 25 is formed at the leg opening edge portion. By forming the high-rigidity region at the leg-opening edge portion in this manner, the floating of the sheet at the leg-opening edge portion can be suppressed, and the side leakage of excrement can be prevented.

In the waist belt 17, since the lower waist elastic member 34 and the waist elastic sheet 35 are disposed in the lower portion 52, the extension stress per unit area in the lateral direction X of the lower portion 52 is higher than the extension stress per unit area in the lateral direction X of the upper portion 51. By thus making the elongation stress of the upper portion 51 relatively low, it becomes easy to expand the waist opening when worn. On the other hand, the lower portion 52 has a relatively high extension stress, and therefore can be stably fitted to the body of the wearer at the leg hole to exert a required holding force. In particular, when the diaper 10 is a so-called low-waist type diaper having a shallow rise and the width dimension of the waist belt 17 is smaller than the width dimension of the diaper main body and is likely to be displaced by movement of the wearer during wearing, the lower portion 52 is stably attached to the body, and the displacement thereof can be suppressed.

< method for measuring elongation stress >

The elongation stress of the upper portion 51 and the elongation stress of the lower portion 52 were measured by the following method using a tensile tester manufactured by instron japan ltd (japanese: インストロンジャパンカンパニーリミテッド). First, the absorbent body 23 is removed from the diaper 10, the regions forming the front waist region 11 and the rear waist region 12 extending in the girth direction are cut out to obtain a ring-shaped elastic sheet, the elastic sheet is cut at the center portion of the width dimension (the center portion in the longitudinal direction Y) with a cut line extending in the girth direction to obtain a ring-shaped sample 1 corresponding to the upper portion of the front waist region 11 and the upper portion of the rear waist region 12 and a ring-shaped sample 2 corresponding to the lower portion of the front waist region 11 and the lower portion of the rear waist region 12, and the dimensions (K1, K2) of the

samples

1 and 2 in the contracted state are measured.

First, in the case of measuring the elongation stress of the sample 1, the separation distance between the upper and lower hooks of the tensile tester is adjusted to the length dimension K1 in the contracted state of the sample 1, and then one end of the sample 1 (a portion corresponding to the central portion 17f in the longitudinal direction of the waist belt 17 shown in fig. 6) is attached to the upper hook (anchor), and the other end of the sample 1 (a portion corresponding to the central portion 17e in the longitudinal direction of the waist belt 17 shown in fig. 6) is attached to the lower hook (movable element). Before the elongation, the distance between the hooks was finely adjusted so that the elongation stress became 0.1N. Thereafter, the tensile testing machine was set to a circulation mode, and the upper hook was moved at a tensile speed of 300 mm/min. For example, in the case where the dimension K1 at the time of contraction is 244mm for the sample 1 (upper portion), the operation of returning the sample 1 to the origin after further elongating it by 235mm is repeated twice, and the extension stress of the sample 1 is determined by measuring the backward stress at the time point of elongation by 56mm for the 2 nd time and the backward stress at the time point of elongation by 181mm for the 2 nd time. On the other hand, the elongation stress of sample 2 was also determined by the same measurement method as sample 1.

As a result of the measurement by the above-described measurement method, the relief stress of sample 1 was 1.082N, and the relief stress of sample 2 was 1.083N, which were all substantially the same in magnitude. Therefore, the extension stress when extending in the girth direction is substantially the same in the front waist region 11 and the rear waist region 12, and the whole of the front waist region 11 and the rear waist region 12 can be expanded with a relatively small force when worn. On the other hand, the return stress of sample 1 is 3.476N and the return stress of sample 2 is 4.557N. Therefore, the leg opening sides of the front and

rear waist regions

11 and 12 can be said to be closer to the body than the waist opening side in the worn state.

The lower waist elastic body 34 disposed in the lower portion 52 is attached at a lower extension ratio than the upper waist elastic body 33 disposed in the upper portion 51. Specifically, the difference between the extension ratio of the lower waist elastic body 34 and the extension ratio of the upper waist elastic body 33 is 0.5 times or less. Specifically, the extension ratio of the upper waist elastic body 33 is 3.2 to 3.7 times, and the extension ratio of the lower waist elastic body 34 is 2.7 to 3.2 times. By setting the extension ratio of the lower waist elastic body 34 to be relatively low in this manner, the contraction amount of the lower portion 52 is reduced as compared with the contraction amount of the upper portion 51, and the leg openings are not extremely reduced in the contracted state as compared with the extended state, and the feet can easily pass through the leg openings. Further, the leg openings are made larger by making the dimension in the contracted state of the leg opening edge portions larger than the state in which the waist elastic sheet 35 is not arranged, and setting the difference in the extension stress between the upper and

lower portions

51, 52 is realized not by adjusting the pitch and the number of the upper waist elastic body 33 and the lower waist elastic body 34 but by arranging the waist elastic sheet 35 in the lower portion 52, so that even in the case where the lower portion 52 has a relatively high extension stress, the lower portion 52 can be attached in a planar manner to the skin to suppress the skin from getting tangled.

The thickness of the lower waist elastic body 34 is preferably larger than the thickness of the upper waist elastic body 33. By setting the thickness of the lower waist elastic body 34 relatively large in this manner, a relatively large extension stress can be exerted at a low magnification, and the fit of the leg-opening edge portions can be achieved.

Referring to fig. 2 and 3, in the extended state in which the diaper 10 is developed by peeling the join line 18A, the length L3 of the upper edge 17d of the waist belt 17 is larger than the length L4 of the lower edge 17c, and is trapezoidal in shape. Specifically, for example, in a typical M-size diaper, the length dimension L5 of the upper edge 17d (the length dimension of the upper portion 51) of the waist belt 17 is 550mm to 600mm, the length dimension L6 of the lower edge 17c (the length dimension of the lower portion 52) is 300mm to 350mm, and the width dimension W1 is 60mm to 95 mm. In the contracted state of the waist belt 17, the length L6 of the lower portion 52 is smaller than the length L5 of the upper portion 51. The length L6 of the lower portion 52 is 50% to 80% of the length L5 of the upper portion 51 in the extended state and the contracted state of the waist belt 17.

Referring to fig. 5 (a) and 5 (B), the waist belt 17 is contractibly joined in an extended state to the front end portion 20A and the rear end portion 20B of the diaper main body 16 via joining

lines

18A and 18B so that the 1 st side edge 17c side is on the leg opening edge side and the 2 nd side edge 17d side is on the waist opening edge side. In the present embodiment, an angle θ 1, which is an angle between an imaginary line 62 orthogonal to the waist opening edge (extending parallel to the longitudinal center line P) and a boundary line 60 between the waist band 17 and the diaper main body 16, which forms the inner edge of the joint line 18A, and the waist opening edge, and an angle θ 2, which is an angle between an imaginary line 64 orthogonal to the waist opening edge and a boundary line 63 between the inner edge of the joint line 18B and the waist opening edge, are the same at an intersection point 61 between the boundary line and the waist opening edge. However, the angles θ 1 and θ 2 may be different from each other in size as needed, and in this case, the front side (ventral side) and the back side (back side) of the diaper 10 can be easily recognized when worn.

When the diaper 10 is worn, a force that a wearer or a wearing assistant grips the waist belt 17 and pulls it up and a force that the waist

elastic bodies

33 and 34 pull it in the girth direction are concentrated, and stress is concentrated at the intersection points 61 and 63 between the waist opening and the joining line 18A, and breakage is likely to occur. At the join line 18A, the plurality of sheets are joined and integrated by the heat-fusion means, not by the hot-melt adhesive, and therefore, the rigidity becomes relatively high, and even if this force is concentrated, breakage of the diaper 10 can be suppressed. In order to prevent breakage from the intersection points 61, 63, the bonding strength may be locally improved by increasing the bonding area of the

entire bonding wires

18A, 18B or the portion on the

intersection point

61, 63 side than the bonding area of the other portion, or by attaching a reinforcing sheet to the region including the portion to improve the sheet strength.

Referring to fig. 2, the dimension L2 in the longitudinal direction Y of the absorbent body 23 is about 65% to 95% of the dimension L1 in the longitudinal direction Y of the diaper 10 (diaper main body 16). In general, the dimension in the longitudinal direction of the absorbent body is about 60% of the dimension in the longitudinal direction of the diaper, and the area of the portion formed only by the sheet member located outside the absorbent body of the diaper in the longitudinal direction becomes relatively large. In the present embodiment, the absorbent body 23 has a length dimension that can sufficiently exhibit the required absorption performance, and the area of the portion located outside the absorbent body 23 in the longitudinal direction Y and formed only of the sheet member is relatively small, so that the absorbent body can be manufactured with less material, and the manufacturing cost can be suppressed. Further, since the front end edge 23a and the rear end edge 23b of the absorbent body 23 are closer to the front end edge 16a and the rear end edge 16b of the diaper main body 16 than in a normal diaper, the worn state is a low-waisted and simple wearing form in which the waist opening is positioned below the umbilical region.

Referring to fig. 6, the diaper 10 has a shape in which the entire waist opening is curved to be convex downward. That is, since the lateral center portions of the front and

rear waist regions

11, 12 are located below the both side portions thereof, a more compact impression can be obtained and the appearance is superior compared to a conventional diaper in which the longitudinal dimensions of the upper and lower regions are the same and the longitudinal dimension of the upper region is larger than the longitudinal dimension of the lower region.

Referring to fig. 7, the high rigidity region 50 is located at the edge on the waist opening 14 side, and when the diaper 10 is worn, fingers can be hooked at the boundary between the high rigidity region 50 and the low rigidity region 43 to pull up the diaper 10. The boundary portion is easily bent due to the difference in rigidity, and the high rigidity region 50 is larger in thickness dimension and convex in shape than the low rigidity region 43, so that a finger is easily hooked on the convex portion. In the conventional diaper in which the high rigidity region is not formed, the waist opening is expanded to a necessary extent or more in order to pull up the waist belt at a portion where no finger is hooked, and it is difficult to perform the pull-up operation. In the diaper 10 of the present embodiment, the high rigidity region 50 extends in the girth direction at the waist opening edge portion, and therefore, the waist opening 14 can be prevented from being expanded to a necessary extent or more when the fingers are hooked, and the force for pulling up the waist band 17 can be easily transmitted to the entire diaper 10 in the girth direction, and the pull-up operation can be easily performed. Further, since the high rigidity region 50 extends to the joining line 18 of the front waist region 11 and the rear waist region 12, the joining strength is increased by the mass per unit area at the end portion of the joining

lines

18A and 18B on the side of the waist opening 14 as compared with the other portion of the joining line 18, and the occurrence of breakage from the end portion can be prevented.

Referring again to FIG. 4, the width dimension W2 of high stiffness region 50 is preferably in the range of about 3mm to 30mm, and more preferably in the range of about 5mm to 20 mm. In the high rigidity region 50, the waist elastic body 33a located on the side closest to the waist opening 14 is preferably disposed adjacent to the upper edge 17d along the upper edge 17 d.

Referring to fig. 8, the waist elastic sheet 35 gradually becomes narrower in the upper portion 51 of the leg opening 15 from the both

end portions

35A, 35B located on the joining

lines

18A, 18B side toward the central portion 35C in the girth direction, and becomes narrowest in the central portion (narrowest portion) 35C. Similarly, the leg elastic sheets 27 are gradually narrowed from the both

end portions

27A, 27B located on the joining lines 18A, 8B toward the central portion (narrowest portion) 27C in the girth direction, and are also narrowed at the central portion 27C. The waist elastic sheet 35 and the leg elastic sheet 27 have such shapes that they are stably bonded to the base of the wearer's thighs at the two

end portions

27A, 27B, 35A, 35B of the two sheets located on the side of the

join lines

18A, 18B, and the

central portions

27C, 35C are brought into contact with the vicinity of the waistline and the outer portion of the thighs where the movement in the body is least, whereby it is possible to achieve appropriate adhesiveness to the body while suppressing the material cost, as compared with the case where the entire elastic sheets are formed in the same width dimension. Further, since the wide region can be positioned on the hip side by slightly displacing the narrowest portion 35C of the waist elastic sheet 35 and the narrowest portion 27C of the leg elastic sheet 27 to the front side with respect to the central portions of the respective longitudinal dimensions, the front portions of the leg openings are larger than the rear portions and are closer to the line of the leg openings of the undergarment, and the undergarment can be easily attached to the body together with the undergarment.

Fig. 9 (a) to 9 (d) are views showing a part of the manufacturing process of the diaper 10. Referring to fig. 9 (a), in the composite sheet 70 serving as a base material of the diaper 10, the side sheet 25 and the waist sheet 30 of the diaper main body 16 are integrally formed by a base sheet 71 made of a fibrous nonwoven fabric. The composite sheet 70 has: a main body 73 serving as a base material of the diaper main body 16 on which the absorber 23 is disposed; the side portions 74 serving as the base material of the waist belt 17 are positioned on both sides of the main body portion 73. In the both side portions 74, the base sheet 71 is attached in a folded state, and continuous

elastic bodies

77A, 77B forming the waist

elastic bodies

33, 34 and the leg elastic bodies 26 are arranged. Further, the continuous elastic sheet 79 is disposed so as to overlap a part of the continuous elastic body 77A and the continuous elastic body 77B.

Referring to fig. 9 (b), next, a pair of oblong holes 75 having an elliptical shape is provided between the main body portion 73 and the side portions 74, and the pair of oblong holes 75 having an elliptical shape is formed by punching so as to extend in parallel with the absorbent body 23. Then, a part of each side portion 74 is bent toward the body portion 73 along a bending line 76 extending so as to overlap the long hole 75. The long hole 75 can also be formed by cutting a linear slit in a part of the base sheet 71, but in this case, sheet breakage is likely to occur from the cut end portion, and therefore, it is preferable to form an opening of a predetermined width by punching.

Referring to fig. 9 (c), 9 (d), 10 (a) and 10 (b), in the thermal cutting step, the main body portion 73 and the side portions 74 of the base sheet 71 are cut along the pair of thermal cutting lines 78, and the diaper 10 can be manufactured. The pair of thermal cutting lines 78 are located at positions facing each other across the absorber 23, and have substantially V-shapes extending obliquely from both end edges of the elongated hole 75 toward both end edges of the base sheet 71. In the thermal cutting step, the stacked

constituent materials

71, 77A, 77B, and 79 are joined to each other along the thermal cutting line 78 to form the

bonding lines

18A and 18B. Leg openings 15 formed by long holes 75 are defined between both

side edges

16c, 16d of the diaper main body 16 and the 1 st side edge 17c of the waist belt 17. By integrally forming the side sheet 25 and the waist sheet 30 of the diaper main body 16 from one base sheet 71 in this manner, the manufacturing process is simplified, and the manufacturing cost can be suppressed.

< embodiment 2 >

Fig. 11 is a perspective view similar to fig. 1 of diaper 10 according to embodiment 2, and fig. 12 is a plan view similar to fig. 2. In fig. 11 and 12, the high rigidity region 50 is dotted-hatched. The basic structure of the diaper 10 of the present embodiment is the same as that of embodiment 1, and therefore only the differences will be described below.

The waist belt 17 in embodiment 2 includes a waist panel 30 forming the outer shape thereof and an auxiliary panel (rigidity reinforcing panel) 80 disposed in the high rigidity region 50. The auxiliary sheet 80 is formed of an elastically stretchable or non-elastically stretchable fibrous nonwoven fabric, is positioned on the inner surface side and/or the outer surface side of the waist sheet 30, and is disposed at the edge of the waist opening 14 along the girth direction, and the width dimension of the auxiliary sheet 80 is different in the longitudinal direction of the waist belt 17. The width dimension of the auxiliary piece 80 is preferably largest at both ends in the longitudinal direction where the joining line 18 is located.

Referring to fig. 12, the minimum dimension M1 of the auxiliary sheet 80 in the width direction is 3mm or more, and the maximum dimension M2 is preferably in the range of 10mm to 50 mm. Further, the dimension N2 of the high rigidity region 50 on the joining

lines

18A, 18B (the dimension of the high rigidity region 50 along the longitudinal direction of the joining line 18) is preferably about 10% to 50% of the length dimension N1 of the joining

lines

18A, 18B. In the present embodiment, the width dimension of the high rigidity region 50 (i.e., the width dimension of the auxiliary sheet 80) is smallest on the transverse center line Q. In the diaper 10, the joining strength between the diaper main body 16 and the waist belt 17 at the joining

lines

18A, 18B can be improved. Further, in the region other than the joint portion, the member cost can be reduced by reducing the width, and the skin feel can be prevented from being reduced by excessively increasing the rigidity of the lumbar belt 17.

In embodiment 1 and embodiment 2, the high rigidity region 50 may be formed at least at the edge of the waist opening 14. The elastic body disposed in the high stiffness region 50 may be a band-shaped or sheet-shaped elastic body instead of the upper waist elastic body 33. In addition, a known bonding means such as an adhesive, for example, a hot melt adhesive, can be used for bonding the sheets in the high rigidity region 50. As long as the above-described effects of the present invention are obtained, a stretchable fiber nonwoven fabric made of elastomer fibers or the like that does not have the waist

elastic members

33 and 34 can be used as the waist panel 30 constituting the waist belt 17.

< embodiment 3 >

Fig. 13 is an expanded plan view of the diaper of embodiment 3 in which the joining line between the front and rear waist regions is released and the diaper main body and the waist belt are extended in the longitudinal and lateral directions. In fig. 13, the portion where the auxiliary piece 90 is located is dotted-hatched. The basic structure of the diaper 10 of the present embodiment is the same as that of embodiment 1, and therefore only the differences will be described below.

In the diaper 10 of the present embodiment, the auxiliary sheet (rigid reinforcing sheet) 90 is disposed at the front end portion 20A and the rear end portion 20B located in the front waist region 11 and the rear waist region 12 of the diaper main body 16. The auxiliary sheet 90 is made of an elastically stretchable or non-elastically stretchable fibrous nonwoven fabric, is positioned on the inner surface side and/or the outer surface side of the inner sheet 21, and extends at least from the waist opening end to the non-existing region of the absorbent body 23. This can increase the rigidity of the relatively low-rigidity region where the absorbent body 23 is not present between the

join lines

18A and 18B, reduce the floating of the boundary portion and the formation of gathers due to the difference in elasticity and rigidity with the waist band 17, and suppress the occurrence of a gap with the body. Further, the auxiliary sheet 90 is preferably disposed so as to overlap the front and rear end portions of the absorbent body 23. By disposing the auxiliary sheet 90 at the front end portion 20A and the rear end portion 20B of the diaper body 16 in this manner, the difference in elasticity with the waist band 17 and the difference in rigidity between the existing region and the non-existing region of the absorbent body 23 can be reduced, and the formation of floating and wrinkles in the sheet formed at each boundary portion can be suppressed, thereby providing a neat appearance such as underwear like pants.

The components constituting the diaper 10 may be made of any known material commonly used for such articles, except the materials described in the present specification. In the description and claims of the present invention, the terms "1 st" and "2 nd" are used only for distinguishing the same elements, positions, and the like.

Description of the reference numerals

10. A diaper; 11. a front waist region; 12. a rear waist region; 13. a crotch region; 14. the waist is opened; 15. a leg opening; 16. a diaper body; 17. a waist belt; 18A, 18B, bonding wires; 26. a leg elastic body; 30. a waist piece; 31. an inner layer; 32. an outer layer; 33A, 33B, waist elastic body; 50. a high stiffness region; 80. an auxiliary sheet; p, longitudinal center line; x, transverse direction; y, longitudinal direction.

Claims

1. A disposable diaper having a longitudinal direction and a transverse direction, and a longitudinal centerline bisecting the dimension in the transverse direction, comprising: a diaper main body having an absorber, the diaper main body having a front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region; a pair of waist belts for connecting the front waist region and the rear waist region; the waist is opened; and a pair of leg openings, the disposable diaper being characterized in that,

the pair of waist belts are joined to the diaper main body at the front waist region and the rear waist region by joining lines whose distance from the leg opening side to the waist opening side is smaller,

a high-rigidity region extending in the girth direction and having a rigidity higher than that of the other region of the waist band is located at an edge of the waist band on the side of the waist opening,

the waist belt has a waist sheet, the high-rigidity region is formed by bending and fixing a part of the waist sheet to an inner surface side or an outer surface side,

the waist piece includes: an inner layer on the skin-facing side; an outer layer on a non-skin-facing side; a plurality of waist elastics mounted between the inner layer and the outer layer,

in the high rigidity region, the waist elastic body does not overlap in the thickness direction of the waist panel.

2. A disposable diaper having a longitudinal direction and a transverse direction, and a longitudinal centerline bisecting the dimension in the transverse direction, comprising: a diaper main body having an absorber, the diaper main body having a front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region; a pair of waist belts for connecting the front waist region and the rear waist region; the waist is opened; and a pair of leg openings, the disposable diaper being characterized in that,

the width dimension of the high rigidity region differs in the longitudinal direction of the waist band, being largest at a position overlapping the joining line.

3. The diaper according to claim 1 or 2,

the waist belt further has the high rigidity region extending along the edge of the leg opening and having a rigidity higher than that of the other region.

4. The diaper according to claim 1 or 2,

both end portions of the high rigidity region are located at the joining line joined to the diaper main body.

5. The diaper of claim 2, wherein,

the width dimension of the high rigidity region is 3mm to 30 mm.