WO2021107050A1

WO2021107050A1 - Disposable diaper

Info

Publication number: WO2021107050A1
Application number: PCT/JP2020/044105
Authority: WO
Inventors: 昂平松田; 宏子川口
Original assignee: 花王株式会社
Priority date: 2019-11-27
Filing date: 2020-11-26
Publication date: 2021-06-03
Also published as: JP2021087776A; CN217908181U; JP7569671B2

Abstract

This disposable diaper (1) comprises a leak-resistant cuff (6). The leak-resistant cuff (6) comprises two facing nonwoven fabrics (60). The leak-resistant cuff (6) has: a free end (61) and a fixed end (62) as two ends in the width direction (Y); an end fixed portion (65) in the vicinity of each end in the longitudinal direction (X), the end fixed portion (65) being fixed to an absorbent body (2); and a free end stretchable portion (64) having an elastic member (63) fixed in the vicinity of the free end (61). The leak-resistant cuff (6) has, between the free end stretchable portion (64) and the fixed end (62), a displaceable region (66) in which the two nonwoven fabrics (60) are not joined together. In the displaceable region (66), the friction coefficient between the facing surfaces of the two nonwoven fabrics (60) is 0.275 or less, and the length (L3) in the longitudinal direction (X) is longer than the length (L1) in the width direction (Y). The length (L1) in the width direction (Y) of the displaceable region (66) is at least three times longer than the length (L2) in the width direction (Y) of the free end stretchable portion (64).

Description

Disposable diapers

The present invention relates to disposable diapers.

Generally, in pants-type disposable diapers, leak-proof cuffs are provided on both sides along the longitudinal direction of the absorber for the purpose of preventing leakage of excrement. For example, Patent Document 1 describes an absorbent article in which an elastic member having the leak-proof cuff arranged near the free end is contracted to stand up, and the leak-proof cuff is made flexible on the free end side. It is disclosed that embossing is applied.

The applicant also disclosed an absorbent article having a leak-proof wall having a hollow inside (Patent Document 2). According to the absorbent article described in Patent Document 2, the standing stability of the leak-proof wall is high, and high leak-proof property can be realized.

JP-A-2017-0237882 JP-A-2009-207599

The present invention has a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction, and is arranged on the ventral side and the dorsal side arranged on the ventral side of the wearer at the time of wearing. A vertically elongated absorbent body having a dorsal portion and a crotch portion located between the ventral side and the dorsal portion and including a liquid permeable surface sheet and an absorber, and the absorbent body of the absorbent body. The present invention relates to a disposable diaper having a pair of leak-proof cuffs arranged along the longitudinal direction on both sides in the longitudinal direction.
The leak-proof cuff is composed of two non-woven fabrics facing each other, has a free end at one end and a fixed end at the other end, and is near both ends in the longitudinal direction. A free end telescopic portion having an end fixing portion fixed to the absorbent body and an elastic member fixed between the two non-woven fabrics via an adhesive in the vicinity of the free end. It is preferable to have.
The free-end stretchable portion and the fixed end have a misalignable region in which the two non-woven fabrics are not joined, and the misalignable region is the friction between the facing surfaces of the two non-woven fabrics. The coefficient is 0.275 or less, the length along the longitudinal direction is longer than the length along the width direction, and the length along the width direction is the length along the width direction of the free end telescopic portion. It is preferably 3 times or more of.

FIG. 1 is a perspective view schematically showing an embodiment of a disposable diaper of the present invention. FIG. 2 is a developed plan view schematically showing the skin facing surface side (inner surface side) in the expanded state in which the diaper shown in FIG. 1 is expanded and extended to the maximum. FIG. 3 is a diagram schematically showing a cross section taken along line III-III shown in FIG. FIG. 4 is an enlarged cross-sectional view schematically showing a cross section of the leak-proof cuff shown in FIG.

Detailed description of the invention

When the wearer moves his / her body while wearing it, the skin and the leak-proof cuff rub against each other, and as a result, skin troubles such as biting may occur. Although the leak-proof cuff described in Patent Document 1 is softened and embossed on the tip side, it cannot prevent the wearer's skin from being rubbed by the leak-proof cuff, which may cause skin troubles. There is. The leak-proof wall described in Patent Document 2 has a complicated structure because the inside is hollow. Further, in the absorbent article described in Patent Document 2, no particular study has been made on the point of preventing rubbing between the leak-proof cuff on which the elastic member is arranged at the free end and the skin.

The present invention relates to a disposable diaper that can prevent the wearer's skin from being rubbed by the leak-proof cuff and, as a result, suppress the occurrence of skin troubles.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. 1 and 2 show a pants-type disposable diaper 1 which is an embodiment of the present invention. As shown in FIGS. 1 and 2, the diaper 1 is placed between the ventral portion F arranged on the ventral side of the wearer and the dorsal portion R arranged on the dorsal side of the wearer when the diaper is worn. It has a crotch M located at. The ventral portion F and the dorsal portion R are connected in an annular shape to form a waist circumference portion arranged around the waist of the wearer when the diaper 1 is worn. The diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side F to the dorsal side R via the inseam M, and a width direction Y orthogonal to the longitudinal direction X. .. The diaper 1 includes an absorbent main body 2 and an exterior body 3 arranged on the non-skin facing surface side of the absorbent main body 2.

In the present specification, the "skin facing surface" is a surface facing the wearer's skin side when the diaper is worn, that is, a relative wearer when focusing on the disposable diaper or its constituent members (for example, an absorbent body). The "non-skin facing surface" is the surface of the disposable diaper or its constituent members that faces the side opposite to the skin side when the disposable diaper is worn, that is, the surface that is relatively close to the skin of the wearer. It is a surface located on the side far from the skin of the diaper. The term "when worn" as used herein means a normal proper wearing state, that is, a state in which the correct wearing state of the disposable diaper is maintained.

In the diaper 1, both sides of the ventral side F and both sides of the dorsal side R of the exterior body 3 are joined to each other by a joining means such as an adhesive, a heat seal, or an ultrasonic seal. As shown in FIG. 1, the diaper 1 is a pants-type disposable diaper. The diaper 1 is formed with a pair of side seal portions S and S, a waist opening WH through which the wearer's torso is passed, and a pair of leg openings LH and LH through which the wearer's lower limbs are passed.

As shown in FIG. 2, the ventral portion F, the dorsal portion R, and the inseam M are divided into three regions by dividing the total length of the diaper 1 into three equal parts in the longitudinal direction X in the deployed and extended state of the diaper 1. Each area of time. In the diaper 1 in the state shown in FIG. 2, the absorbent main body 2 has a substantially rectangular shape long in the longitudinal direction X. The absorbent body 2 is arranged in the region from the ventral side F to the dorsal side R of the exterior body 3. The "deployed and extended state" of a pants-type disposable diaper such as the diaper 1 means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the expanded state of the diaper 1 is designed by extending the elastic members of each part. (Same as the dimensions when expanded in a plane with the influence of the elastic member completely removed). When the diaper is a deployable disposable diaper, it means a state in which the elastic members of each part are stretched and the diaper is expanded until it reaches the design dimensions. The absorbent body 2 is arranged at the center of the exterior body 3 in the width direction Y. The absorbent body 2 is joined to the exterior body 3 by a joining means such as an adhesive.

As shown in FIG. 2, the absorbent main body 2 includes a liquid-retaining absorber 4 and a liquid-permeable surface sheet 5 that forms a skin-facing surface of the diaper 1. As shown in FIG. 3, the surface sheet 5 covers the entire area of the absorber 4 and extends outward from the side edge of the absorber 4 in the longitudinal direction X. The absorber 4 and the surface sheet 5 are joined by a known joining means such as an adhesive. Like the absorbent body 2, the absorber 4 has a long shape in the longitudinal direction X of the diaper 1.

As shown in FIGS. 2 and 3, the absorber 4 includes an absorbent core 40 and a core wrap sheet 41 that covers the absorbent core 40. The absorbent core 40 is composed of a fiber aggregate or a fiber aggregate having a water-absorbing polymer retained therein. The core wrap sheet 41 is made of tissue paper or a water-permeable non-woven fabric. The core wrap sheet 41 preferably covers the entire skin-facing surface side and non-skin-facing surface side of the absorbent core 40.

As shown in FIG. 3, the absorbent core 40 has a single layer. The absorbent core 40 may or may not have a flexible portion inward in the width direction Y. Examples of the flexible portion include a slit penetrating the absorbent core 40, a low basis weight portion having a low basis weight, and the like. When the flexible portion is provided, the side region 43 along the longitudinal direction X of the absorbent body 2 easily rises around the flexible portion in the wearing state, and excrement such as urine is outside the width direction Y. You can prevent it from flowing out. In the embodiment shown in FIG. 3, the flexible portion has a pair of

slits

44, 44 extending in the longitudinal direction X. The slits 44 are arranged at least in the crotch portion M at an inward position separated from both side edges along the longitudinal direction X of the absorbent core 40. The side region 43 of the absorbent main body 2 is a portion of the absorbent main body 2 located outside the width direction Y from the position corresponding to the slit 44. From the viewpoint of facilitating the standing of the side region 43, the basis weight of the side region 43 is preferably smaller than the basis weight of the central region 42 sandwiched between the pair of

slits

44, 44. When provided with a low basis weight portion, instead of the slit 44, the basis weight of the low basis weight portion is preferably 0 g / ^{m 2} or more 300 g / ^{m 2} or less, more preferably 0 g / ^{m 2} Ultra 300 g / ^{m 2} or less, More preferably, it is 80 g / m ² or more and 120 g / m ² or less. The absorbent core 40 may have multiple layers.

As shown in FIG. 3, the non-skin facing surface side of the absorbent main body 2 is covered with a liquid-impermeable leak-proof sheet 7 made of a resin film. With respect to the leak-proof sheet 7, the liquid impermeability is a concept including the liquid impermeability. The leak-proof sheet 7 is arranged so as to cover the entire non-skin facing surface of the absorber 4. A leak-proof sheet 7, a non-woven fabric 60 constituting the leak-proof cuff 6, and an absorbent main body 2 are sequentially joined to the skin-facing surface side of the exterior body 3 with an adhesive such as a hot-melt adhesive.

As shown in FIG. 3, the exterior body 3 of the diaper 1 is composed of two exterior

body forming sheets

31 and 32 and elastic members of each part fixed between the two sheets in an extended state. Between the two exterior

body forming sheets

31 and 32, as shown in FIG. 2, the waist elastic member 33 forming the waist gather on the peripheral edge of the waist opening WH and the peripheral edge of the leg opening LH. A leg elastic member 34 forming leg gathers and a waist elastic member 35 forming waist gathers are arranged around the waist. The waist circumference portion is a region from a position 20 mm downward from the peripheral edge of the waist opening WH to the upper end of the leg opening LH. The

elastic members

33, 34, and 35 are joined and fixed between the

sheets

31 and 32 by any joining means such as a hot melt type adhesive in an elongated state, respectively.

As shown in FIG. 2, the absorbent main body 2 is provided with a pair of leakage-

proof cuffs

6 and 6 on both sides along the longitudinal direction X on the skin facing surface. The leak-proof cuff 6 is composed of two

non-woven fabrics

60 and 60 facing each other. The two non-woven fabrics may be separate non-woven fabrics, or one non-woven fabric may be folded back. In the embodiment shown in FIG. 3, the leakage-proof cuff 6 is configured by folding one non-woven fabric 60 in the width direction Y and arranging the two

non-woven fabrics

60, 60 so as to face each other.

The leak-proof cuff 6 shown in FIG. 3 will be described. The diaper 1 of the present embodiment is a pair of first leak-

proof cuffs

6A and 6A and a pair of first leak-

proof cuffs

6A and 6A located outside the width direction Y of the pair of first leak-

proof cuffs

6A and 6A. It has second leakage-

proof cuffs

6B and 6B. The non-woven fabric 60 is folded back in the width direction Y above the absorber 4, and is folded back in the width direction Y at a portion of the absorber 4 located outward from the side edge along the longitudinal direction X. The non-woven fabric 60 thus folded is joined to the surface sheet 5 or the leak-proof sheet 7. The joint portion 68 formed by this joint extends along the longitudinal direction X. The joint portion 68 is arranged along the side edge of the absorber 4 along the longitudinal direction X, and is arranged outside the side edge. The first leakage-proof cuff 6A is formed at a portion of the non-woven fabric 60 that is folded back above the absorber 4, and is formed on the inner side in the width direction Y with respect to the joint portion 68. On the other hand, the second leakage-proof cuff 6B is formed at a portion of the non-woven fabric 60 that is folded outward from the side edge of the absorber 4, and is formed on the outer side in the width direction Y from the joint portion 68. .. A known joining method such as a heat seal, an ultrasonic seal, or a hot melt type adhesive can be used to form the joint portion 68.

The first leak-proof cuff 6A and the second leak-proof cuff 6B each have a free end 61 and a fixed end 62 at both ends in the width direction Y. In the vicinity of the free end 61, one or more elastic members 63 are fixed between the two

non-woven fabrics

60, 60 by an adhesive. Due to the elastic member 63 being fixed in the longitudinal direction X in an extended state, the leakage-

proof cuffs

6A and 6B are fixed in the vicinity of the free end 61, that is, the elastic member 63 is fixed by an adhesive from the free end 61. The free end expansion / contraction portion 64 is provided together in the portion extending over the range. As shown in FIG. 3, the position of the joint portion 68 on the free end 61 side is the fixed end 62. The fixed ends 62 of the first leak-proof cuff 6A and the second leak-proof cuff 6B are both formed on the outer side in the width direction Y from the side edge of the absorber 4, and are formed on the side edge 2s of the absorbent body 2. It extends along.

From the viewpoint of elasticity of the free end expansion / contraction portion 64 in the longitudinal direction X, it is preferable that the number of elastic members 63 arranged in the free end expansion / contraction portion 64 is two or more. From the same viewpoint, the thickness of the elastic member 63 is preferably 300 dtex or more, more preferably 700 dtex or more, preferably 900 dtex or less, and further preferably 800 dtex or less.

As shown in FIG. 2, the first leak-proof cuff 6A and the second leak-proof cuff 6B are fixed on the absorbent body 2 in the vicinity of both ends in the longitudinal direction X, that is, in the ventral side F or the dorsal side R, respectively. It has the

end fixing portions

65, 65. At the end of the ventral portion F and the end of the dorsal portion R, the end fixing portion 65 of the first leak-proof cuff 6A is formed at a portion of the surface sheet 5 that overlaps with the absorber 4. The end fixing portion 65 of the second leak-proof cuff 6B is formed at a portion of the leak-proof sheet 7 located outward from the side edge of the absorber 4. The leak-

proof cuffs

6A and 6B are adapted to stand up at least at the inseam M by contracting the elastic members 63 arranged in the extended state when the diaper 1 is worn. If the leakage-

proof cuffs

6A and 6B stand up, it is possible to prevent excrement such as urine from flowing out in the width direction Y.

In the first leak-proof cuff 6A and the second leak-proof cuff 6B, as shown in FIG. 3, two

non-woven fabrics

60 and 60 are joined between the free end telescopic portion 64 and the fixed end 62, respectively. It has a non-woven fabric area 66. The shiftable region 66 is a region sandwiched between the inner end of the free end telescopic portion 64 in the width direction Y and the fixed end 62. The inner end is the position of the adhesive fixing the elastic member 63 constituting the free end telescopic portion 64, and extends from the free end 61 toward the fixed end 62 and fixes the elastic member 63. It is the position closest to the fixed end 62 among the coated parts of the adhesive. When the inner end cannot be determined, it is a region sandwiched between the elastic member 63 constituting the free end telescopic portion 64 and the fixed end 62. The shiftable region 66 is formed so that the length along the longitudinal direction X is longer than the length along the width direction Y. The shiftable area 66 extends between the ventral portion F and the dorsal portion R.

The two

non-woven fabrics

60, 60 constituting the shiftable region 66 have a friction coefficient of 0.275 or less when the inner surfaces that are facing each other are brought into contact with each other and a shearing force is applied. The coefficient of friction between the facing surfaces of the two

non-woven fabrics

60, 60 in the shiftable region 66 is measured by the following method.

[Measurement method of friction coefficient between facing surfaces in two non-woven fabrics in the shiftable area]
First, the non-woven fabric of the corresponding part is cut out from the product. Specifically, the two

non-woven fabrics

60 and 60 constituting the portion corresponding to the shiftable area 66 are cut out from the leak-proof cuff 6. At this time, confirm that there is no adhesion of hot melt or the like in the shiftable area. Next, of the two cut-out non-woven fabrics, one of the non-woven fabrics is stretched so as not to have wrinkles and attached to a horizontal plate having no unevenness. Then, the other non-woven fabric is attached to the contact surface of the jig for friction measurement. The contact surface has a size of 10 mm in the width direction Y of the leak-proof cuff 6 x 20 mm in the longitudinal direction X of the leak-proof cuff 6. The other non-woven fabric attached to the jig is placed on top of one non-woven fabric attached to the horizontal plate so that the facing surfaces of the two

non-woven fabrics

60, 60 forming the shiftable area 66 face each other. To do. If it is difficult to cut out in the width direction Y10 mm × longitudinal direction X20 mm, which are the above dimensions, the size may be changed to a predetermined size and cut out. Next, with a normal force (N) of 1.96 N applied to the jig to which the other non-woven fabric is attached, the jig is moved by 20 mm at a speed of 300 to 400 mm / min along the longitudinal direction X of the leakage-proof cuff. The maximum load at that time is obtained as the frictional force (F). Then, the friction coefficient is calculated as the friction coefficient between the non-woven fabrics = friction force (F) / normal force (N). A force gauge such as the RZ-1 series manufactured by Aiko Engineering Co., Ltd. is used to measure the frictional force (F). N = 15 is measured at different parts, and the average value is used as the coefficient of friction between the non-woven fabrics.

In the unfolded and extended state, as shown in FIG. 3, the length L1 along the width direction Y of the shiftable region 66 in each of the pair of first leakage-

proof cuffs

6A and 6A is in the width direction Y of the free end telescopic portion 64. It is more than three times the length along L2. Similarly, for each of the pair of second leakage-

proof cuffs

6B and 6B, the length L1 of the shiftable region 66 is three times or more the length L2 of the free end telescopic portion 64. The lengths L1 and L2 are the lengths of the first leak-proof cuff 6A and the second leak-proof cuff 6B when the diaper 1 is provided with the first leak-proof cuff 6A and the second leak-proof cuff 6B. It is preferable that the condition that the length L1 is three times or more the length L2 is satisfied, and the length L1 is three times or more the length L2 in the average value of the first leak-proof cuff 6A and the second leak-proof cuff 6B. It is more preferable to satisfy the condition of.

According to the diaper 1 of the present embodiment, since the leak-proof cuff 6 having a shiftable range 66 in which the friction coefficient between the two

non-woven fabrics

60 and 60 facing each other is 0.275 or less is provided, the wearing state is provided. When the wearer moves his / her body and the relative position between the skin and the leak-proof cuff 6 shifts while in contact with the leak-proof cuff 6, the contact state between the skin and the leak-proof cuff 6 is established. While maintaining the position, the

non-woven fabrics

60 and 60 facing each other in the shiftable area 66 are likely to shift. Moreover, since the length L1 in the width direction Y of the shiftable region 66 is three times or more the length L2 of the free end expansion / contraction portion 64, the leak-proof cuff 6 follows the skin and is in the width direction Y. In a wide range, the

non-woven fabrics

60 and 60 facing each other are easily displaced, and the surface in contact with the skin in the shiftable region 66 is sufficiently easy to move in the width direction Y. Further, since the length of the shiftable region 66 in the longitudinal direction X is longer than the length L1 in the width direction Y, the shiftable region 66 moves in the width direction Y in a wide range of the longitudinal direction X following the skin. It's easier. As a result, the leak-proof cuff 6 can prevent the wearer's skin from being rubbed, and can suppress the occurrence of skin troubles such as redness on the skin.

In the diaper 1 of the present embodiment, as shown in FIG. 3, the absorbent core 40 has a pair of

slits

44, 44 serving as flexible portions, so that the absorbent core 40 absorbs the slits 44 as a starting point in the wearing state. The side region 43 of the sex body 2 is easily deformed. In the wearing state, the

non-woven fabrics

60 and 60 are easily displaced in the shiftable area 66 of the leak-proof cuff 6, and in addition, the side region 43 is easily displaced and deformed starting from the slit 44, so that the leak-proof cuff 6 is used. The rubbing of the skin can be further prevented.

From the viewpoint of preventing the wearer's skin from being rubbed by the leak-proof cuff 6, the shiftable area 66 preferably exists at least in the inseam M, and more preferably extends from the inseam M to the dorsal side R. It is preferably present, and more preferably it is present from the ventral side F to the dorsal side R.

From the viewpoint of improving the followability of the slippable area 66 to the skin in the wearing state and preventing the skin from being rubbed by the leak-proof cuff 6, the facing surfaces of the two

non-woven fabrics

60 and 60 of the slippable range 66 The coefficient of friction is preferably 0.275 or less, and more preferably 0.260 or less. The closer the lower limit of the friction coefficient is to 0, the more preferable it is, but if it is 0.220 or more, sufficient skin followability can be imparted to the shiftable region 66.

From the viewpoint of improving the followability of the shiftable area 66 to the skin in the wearing state and preventing the skin from being rubbed by the leak-proof cuff 6, the length of the shiftable range 66 with respect to the length L2 of the free end expansion / contraction portion 64. The L1 is preferably 3 times or more, more preferably 5 times or more, further preferably 10 times or less, further preferably 8 times or less, and 3 times or more and 10 times or less. It is preferable that the amount is 5 times or more and 8 times or less. When the diaper 1 is provided with the first leak-proof cuff 6A and the second leak-proof cuff 6B, the above-mentioned length L1 and length L2 in either the first leak-proof cuff 6A or the second leak-proof cuff 6B. It is preferable that the above conditions of the first leak-proof cuff 6A and the second leak-proof cuff 6B are satisfied, and it is more preferable that the above-mentioned conditions of the length L1 and the length L2 are satisfied in the average value of the first leak-proof cuff 6A and the second leak-proof cuff 6B. More specifically, the first leak-proof cuff 6A and the second leak-proof cuff 6B are displaced in the first leak-proof cuff 6A with respect to the length of the free-end telescopic portion 64 in the first leak-proof cuff 6A along the width direction Y. The length of the possible region 66 along the width direction Y is preferably 3 times or more, more preferably 5 times or more, further preferably 10 times or less, and further preferably 8 times or less. It is preferable, and it is preferably 3 times or more and 10 times or less, and further preferably 5 times or more and 8 times or less. The length of the second leak-proof cuff 6B along the width direction Y of the free-end telescopic portion 64 may be more than twice as long as the length of the second leak-proof cuff 6B along the width direction Y of the shiftable area 66. It is preferably 3 times or more, more preferably 12 times or less, further preferably 10 times or less, and preferably 2 times or more and 12 times or less, 3 times or more and 10 times. The following is more preferable.

The length of the first leakage-proof cuff 6A along the width direction Y of the shiftable region 66 is preferably 10 mm or more, more preferably 15 mm or more, and more preferably 35 mm or less, preferably 30 mm or less. It is more preferable to have. The length of the second leakage-proof cuff 6B along the width direction Y of the shiftable region 66 is preferably 20 mm or more, more preferably 30 mm or more, and more preferably 50 mm or less, preferably 40 mm or less. It is more preferable to have.
The length of the free end telescopic portion 64 in the first leakage-proof cuff 6A along the width direction Y is preferably 2 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, and 10 mm or less. Is more preferable. The length of the free end expansion / contraction portion 64 in the second leakage-proof cuff 6B along the width direction Y is preferably 3 mm or more, more preferably 5 mm or more, further preferably 20 mm or less, and preferably 15 mm or less. Is more preferable.

In the embodiment shown in FIG. 3, the leak-proof cuff 6 having the shiftable area 66 includes the first leak-proof cuff 6A and the second leak-proof cuff 6B, so that the leak-proof cuff 6 follows the skin and shifts. The possible area 66 is more sufficiently easy to move in the width direction Y. As a result, the leak-proof cuff 6 can further prevent the wearer's skin from being rubbed, and further suppress the occurrence of skin troubles such as redness on the skin.

From the viewpoint of further improving the ease of slipping between the first leak-proof cuff 6A and the second leak-proof cuff 6B, the friction coefficient between the surfaces of the first leak-proof cuff 6A and the second leak-proof cuff 6B that are close to each other , 0.275 or less, and more preferably 0.260 or less. The closer the lower limit of the friction coefficient is to 0, the more preferable it is, but if it is 0.220 or more, a sufficient deviation between the first leakage-proof cuff 6A and the second leakage-proof cuff 6B should be generated. Can be done. The surfaces close to each other are the non-woven fabrics located on the skin-facing surface side of the two

non-woven fabrics

60 and 60 constituting the first non-woven fabric cuff 6A and the second non-woven fabric cuff 6B in the expanded and stretched state shown in FIG. 60 skin-facing surfaces. The coefficient of friction between the first leak-proof cuff 6A and the second leak-proof cuff 6B is the same as the method for measuring the friction coefficient between the facing surfaces of the two

non-woven fabrics

60 and 60 in the shiftable region 66 described above. Be measured.

From the viewpoint that the shiftable region 66 is sufficiently easy to move in the longitudinal direction X, the length L3 along the longitudinal direction X (see FIG. 2) is relative to the length L1 along the width direction Y (see FIG. 3) in the expanded and extended state. ) Is preferably 5 times or more, more preferably 10 times or more, further preferably 50 times or less, further preferably 20 times or less, and 5 times or more and 50 times or less. It is preferably present, and more preferably 10 times or more and 20 times or less.
From the same viewpoint, in the deployed and extended state, as shown in FIG. 2, the length L4 (see FIG. 3) along the longitudinal direction X of the leakage-proof cuff 6 is along the longitudinal direction X of the shiftable region 66. The length L3 (see FIG. 2) is preferably 60% or more, more preferably 75% or more, still more preferably 95% or less, still more preferably 85% or less.
The length L3 of the shiftable region 66 is preferably 200 mm or more, more preferably 280 mm or more, further preferably 500 mm or less, and further preferably 360 mm or less.
The length L4 of the leakage-proof cuff 6 is preferably 240 mm or more, more preferably 330 mm or more, more preferably 600 mm or less, and further preferably 500 mm or less.

From the viewpoint of following the skin and further improving the ease of displacement of the shiftable area 66, the two

non-woven fabrics

60 and 60 have an average deviation (MMD) of friction coefficients of the inner surfaces facing each other in the shiftable range 66. , 0.012 or less, more preferably 0.01 or less, still more preferably 0.008 or less. The closer the lower limit value of the average deviation MMD is to 0, the more preferable it is, but if it is 0.003 or more, it is possible to impart the follow-up performance to the skin to the shiftable range 66 of the leakage-proof cuff 6.

The mean deviation MMD of the friction coefficient is measured by the following method using KESFB4-AUTO-A (trade name) manufactured by Katou Tech Co., Ltd. according to the method described in the following book.
Kio Kawabata, "Standardization and Analysis of Texture Evaluation", 2nd Edition, Texture Measurement and Standardization Research Committee, Japan Textile Opportunity Society, published on July 10, 1980.

[Measurement method of mean deviation MMD of friction coefficient]
Take out a 20 cm × 20 cm test piece from the non-woven fabric that constitutes the slipperable area of the leak-proof cuff or the non-woven fabric used for the leak-proof cuff. If a test piece of this size cannot be taken out, the size of the test piece may be changed as appropriate. The test piece is mounted on a test table on a smooth metal surface. At that time, the surface to be brought into contact with the contact is attached so as to be the inner surface of the non-woven fabric in the shiftable area. The contact surface is crimped to the test piece with a force of 49 cN, and the test piece is moved horizontally by 2 cm at a constant speed of 0.1 cm / sec. A uniaxial tension of 7.3 cN / cm is applied to the test piece. The contactor is made by arranging 20 piano wires having the same diameter of 0.5 mm as the contactor used for measuring the surface roughness and bending them into a U shape with a width of 10 mm. The contact surface is pressed against the test piece with a force of 49 cN by a weight. The measured value of the mean deviation of the coefficient of friction is represented by the MMD value. This measurement is performed in both the MD direction and the CD direction _{to obtain MMD MD} and MMD _CD , and the average value is calculated from the following equation (1), which is used as the average deviation MMD of the friction coefficient. The MD direction in this measurement is one of the longitudinal direction X and the width direction Y, and the CD direction is a direction orthogonal to the MD direction. If the sample test piece can be taken out in only one of the MD direction and the CD direction, the value of only one is taken as the mean deviation MMD of the surface roughness.

Mean deviation of friction coefficient MMD
= {(MMD _MD ² + MMD _CD ² ) / 2} ^1/2 ... (1)

From the viewpoint of making it easier for the outer surface of the non-woven fabric 60 in the non-woven fabric 60 to come into close contact with the skin and further improving the ease of displacement between the inner surfaces of the non-woven fabric 60, the mean deviation MMD of the friction coefficient of the outer surface of the non-woven fabric 60 is It is preferably larger than the average deviation MMD of the coefficient of friction on the inner surface. The average deviation MMD of the friction coefficient of the outer surface is preferably 1.1 times or more, more preferably 1.5 times or more, and 3 times or less of the average deviation MMD of the friction coefficient of the inner surface. Is preferable, and more preferably, it is twice or less. The average deviation MMD of the coefficient of friction of the outer surface is preferably less than 0.012, more preferably 0.010 or less, and even more preferably 0.005 or more. The average deviation MMD of the friction coefficient of the outer surface is measured in the same manner as the above-described method for measuring the average deviation MMD of the friction coefficient. When mounting the test piece on the test stand, it should be noted that the surface in contact with the contactor should be the outer surface of the non-woven fabric in the shiftable area.

From the viewpoint of further improving the ease of slipping between the leak-proof cuff 6 and the surface sheet 5 and, as a result, preventing the wearer's skin from being rubbed by the leak-proof cuff 6, the non-woven fabric 60 of the leak-proof cuff 6 The average deviation MMD of the friction coefficient of each of the surfaces facing each other with the surface sheet 5 is preferably 0.012 or less, and more preferably 0.010 or less. The closer the lower limit of the average deviation MMD is to 0, the more preferable it is, but if it is 0.005 or more, the wearer's skin and the leakage-proof cuff 6 are not sufficiently rubbed. The surface of the nonwoven fabric 60 facing the surface sheet 5 is the outer surface of the nonwoven fabric 60. The average deviation MMD of the friction coefficient on the facing surfaces of the non-woven fabric 60 and the surface sheet 5 is measured in the same manner as the above-described method for measuring the average deviation MMD of the friction coefficient. When mounting the test piece on the test table, it should be noted that the surface in contact with the contact is the facing surface.

From the viewpoint of further improving the ease of slipping between the leak-proof cuff 6 and the surface sheet 5, the friction coefficient between the non-woven fabric 60 of the leak-proof cuff 6 and the surface sheet 5 is 0.275 or less. It is preferably 0.260 or less, and more preferably 0.260 or less. The closer the lower limit of the friction coefficient is to 0, the more preferable it is, but if it is 0.220 or more, a sufficient deviation between the leakage-proof cuff 6 and the surface sheet 5 can be generated. The coefficient of friction between the non-woven fabric 60 of the leak-proof cuff 6 and the surface sheet 5 is measured by the same method as the method for measuring the friction coefficient between the facing surfaces of the two

non-woven fabrics

60 and 60 in the shiftable region 66 described above. To.

The two

non-woven fabrics

60 and 60 in the shiftable area 66 are each formed by using a highly flexible non-woven fabric from the viewpoint of improving the followability of the shiftable area 66 to the skin in the wearing state. The flexibility of the non-woven fabric 60 of the leak-proof cuff 6 can be evaluated by the compressive load value. The compression load value in the diaper width direction Y of each non-woven fabric 60 of the leakage-proof cuff 6 is preferably 5 cN or less, and more preferably 4 cN or less. The lower limit of the compressive load value is preferably closer to 0 cN, but if it is 1 cN or more, sufficient softness can be imparted to the leak-proof cuff 6. The compressive load value of the non-woven fabric 60 in the diaper width direction Y is measured by the following method.

[Measurement method of compressive load value]
Cut the leak-proof cuff 6 from the absorbent body 2.
In the shiftable area 66, one non-woven fabric 60 is cut out in a rectangular shape of 80 mm × 20 mm along the width direction Y along the longitudinal direction X of the absorbent body 2. This non-woven fabric is folded along a line along the width direction Y at the center of the longitudinal direction X, and further folded along a line along the width direction Y at the center of the longitudinal direction X to form a quadruple measuring piece. The edges of the measurement piece are aligned by smoothing out the wrinkles and sandwiching the folded non-joint side with a clip or the like.
The obtained quadruple measuring piece (sample width; 20 mm) was placed on a chuck on the lower side of a compression tester (for example, Shimadzu Autograph compression tester "AG-X") with the width direction vertical. The maximum load shown when compressed at a speed of 10 mm / min is measured with a circular compression plate having a diameter of 30 mm or more attached to the upper side of the compression tester, sandwiching 5 mm of the vertical end so as to protrude from the upper part of the chuck.
The length of the measuring piece in the width direction may be less than 20 mm as long as it can be sandwiched between the chucks of the testing machine so as to protrude 5 mm from the upper part of the chuck.
Similar measurements are made for the five samples, and the average value thereof is taken as the compressive load value of one non-woven fabric 60.

The leakage-proof cuff 6 is preferably configured by arranging two

non-woven fabrics

60, 60 having a compression load value of 5 cN or less so as to face each other. The two non-woven fabrics may be separate non-woven fabrics that satisfy the conditions of the compressive load value, or one non-woven fabric that satisfies the conditions of the compressive load value may be folded in half. In the embodiment shown in FIG. 2, the leakage-proof cuff 6 is configured by folding one non-woven fabric 60 in half and arranging the two

non-woven fabrics

60, 60 so as to face each other.

The bulk softness of each of the two

non-woven fabrics

60 and 60 in the shiftable area 66 is preferably 8 cN or less, and more preferably 5 cN or less. When the leak-proof cuff 6 is formed of such a non-woven fabric 60, fine wrinkles are likely to be formed on the two

non-woven fabrics

60, 60 when the leak-proof cuff 6 stands up due to the shrinkage of the elastic member 63. As a result, the two

non-woven fabrics

60 and 60 are easily separated from each other, and the shiftable area 66 is more likely to shift following the skin. The closer the lower limit of the bulk softness of the non-woven fabric 60 is to 0, the more preferable it is, but if it is 3 cN or more, the two

non-woven fabrics

60, 60 are sufficiently easily separated from each other. The bulk softness of the non-woven fabric 60 is measured by the following method.

[Measurement method of bulk softness]
In a 22 ° C. 65% RH environment, 150 mm in the CD direction along the orientation direction of the constituent fibers and 30 mm in the MD direction orthogonal to the CD direction are cut out from the non-woven fabric 60 of the leakage-proof cuff 6 and used as a measurement piece. The measuring piece is stapled at two upper and lower ends so as to form a ring having a diameter of 45 mm. At this time, the stapler core is made longer in the CD direction. Next, using a tensile tester (for example, Tensilon tensile tester "RTA-100" manufactured by Orientec Co., Ltd.), the ring-shaped measuring piece is erected in a tubular shape on a sample table, and is substantially parallel to the table from above. The maximum load when compressed with a flat plate at a compression speed of 10 mm / min is measured. This measurement is performed at any three points cut out from the surface sheet, and the average value of these is taken as bulk softness.

The amount of deformation of the leak-proof cuff 6 at 1 kPa compression is large from the viewpoint that the leak-proof cuff 6 feels good on the skin and it is difficult for the cuff marks due to the contact between the skin and the leak-proof cuff 6 to adhere to the skin. It is preferably 1 mm or more, more preferably 1.1 mm or more. The amount of deformation during 1 kPa compression is measured by the following method.

[Measurement method of deformation amount at 1 kPa compression]
The leak-proof cuff 6 is taken out from the diaper 1, and in a state where the leak-proof cuff 6 is extended, a test piece having a width of 5 mm from the free end 61 and a length of 120 mm in the longitudinal direction X is cut out so as to include the free end telescopic portion 64. The test piece is attached to the test table of the measuring device in a state of being extended to 70 mm in the longitudinal direction X. At this time, the elastic member 63 of the leak-proof cuff 6 is arranged so as to be located at the center of the test table. As a measuring device, a KES compression tester (KESFB3-AUTO-A manufactured by Kato Tech Co., Ltd.) is used to compress the test piece (free end expansion / contraction part) under the following conditions, and when compressed by 1 kPa from the stress-strain at that time. The amount of deformation of is calculated.
Compression rate: 0.02 mm / s
Compressor: 2 cm ² circular plate

As shown in FIG. 3, from the viewpoint of making it difficult for the skin to touch the surface sheet 5 in the worn state and further improving the ease of shifting of the shiftable range 66 following the skin, a pair of first pairs in the deployed and stretched state. With respect to the distance L5 along the width direction Y between the free ends 61 and 61 of the leakage-

proof cuffs

6A and 6A, the thickness L6 of the free-end expansion and

contraction portions

64 and 64 of the pair of first leakage-

proof cuffs

6A and 6A is 0. It is preferably 4% or more, more preferably 0.5% or more, still more preferably 5.0% or less, still more preferably 1.0% or less. The thickness L6 of the free end telescopic portion 64 is measured by using a digital microscope (manufactured by KEYENCE) as a cross section of the leak-proof cuff cut with a sharp blade in the width direction Y.

The thickness L6 of the free end expansion / contraction portion 64 is preferably 0.3 mm or more, and more preferably 0.5 mm or more, from the viewpoint of following the skin and further improving the ease of deviation of the shiftable region 66. Further, it is preferably 2.0 mm or less, and more preferably 1.0 mm or less.
From the same viewpoint, the distance L5, which is the distance between the free ends 61, 61 of the pair of first leakage-

proof cuffs

6A, 6A, is preferably 40 mm or more, more preferably 50 mm or more, and 150 mm or less. It is preferably 80 mm or less, and more preferably 80 mm or less.

As shown in FIG. 3, when the absorber 4 has the slit 44, the first leak-proof state is in the deployed and extended state from the viewpoint of following the skin and further improving the ease of shifting of the shiftable region 66. The free end expansion / contraction portion 64 of the cuff 6A is preferably located inward in the width direction Y with respect to the slit 44. Further, it is preferable that the misalignable region 66 of the first leakage-proof cuff 6A and the side region 43 of the absorbent main body 2 overlap in the thickness direction.

As shown in FIG. 4, as shown in FIG. 4, the embossed portion 80 in which the constituent fibers are integrated is a flat surface as the two

nonwoven fabrics

60 and 60 from the viewpoint of further improving the ease of displacement between the

nonwoven fabrics

60 and 60 in the shiftable region 66. Those formed so as to be separated from each other in the direction can be preferably used. From the viewpoint of further improving the ease of displacement, a non-woven fabric in which the main component of the constituent fibers is a propylene random copolymer can be preferably used. Examples of the non-woven fabric 60 satisfying these requirements include a spunbonded non-woven fabric, a melt-blown non-woven fabric, and a laminated non-woven fabric of a spunbond layer and a melt-blown layer. A lubricant such as a surfactant may be added to the non-woven fabric 60 for the purpose of further improving the ease of slipping.

When the two

non-woven fabrics

60 and 60 are arranged so as to face each other to form the leakage-proof cuff 6, from the viewpoint of further improving the ease of slipping between the

non-woven fabrics

60 and 60, as shown in FIG. In the

non-woven fabrics

60 and 60, one surface 6f is an embossed surface having a larger undulation than the other surface 6n, and it is preferable that the one surfaces 6f, which are embossed surfaces, face each other in the shiftable region 66. That is, it is preferable that the recess 91 formed by the embossed portion 80 on one surface 6f is deeper than the other surface 6n. The recess 91 is a recess having the embossed portion 80 as the bottom.

From the same viewpoint as above, in the non-woven fabric 60, the area ratio of the embossed portion 80, which is the ratio of the total area of the areas of the plurality of embossed portions 80 to the surface area of one surface, is preferably 18% or less. It is more preferably% or less. The lower limit of the ratio of the total area is preferably as low as possible, but if it is 8% or more, the easiness of slipping between the

nonwoven fabrics

60 and 60 can be further improved.

The area of each embossed portion 80 formed on the non-woven fabric 60 is preferably 0.1 mm ² or more, more preferably 0.3 mm ² or more, and preferably 0.7 mm ² or less, further preferably 0.5 mm. ^{It is 2} or less.

Of the plurality of embossed portions 80 of the non-woven fabric 60, the shortest distance between one embossed portion 80 and another embossed portion 80 located closest to the embossed portion 80 is preferably 0.8 mm or more, more preferably 0.8 mm or more. Is 1.0 mm or more, preferably 3.0 mm or less, and more preferably 2.0 mm or less.

From the viewpoint that the shiftable area 66 follows the movement of the skin and becomes easy to move in the wearing state, it is preferable that the inner surfaces of the two

non-woven fabrics

60 and 60 are raised so that the non-woven fabrics face each other. Examples of the brushed non-woven fabric include those described in JP-A-2012-092475, those described in JP-A-2014-139357, and the like.

As the material constituting each part of the diaper 1 of the present embodiment, materials usually used in the technical field can be used without particular limitation. For example, as the surface sheet 5, various non-woven fabrics, perforated films, and the like can be used. Examples of the leak-proof sheet 7 include a liquid-impermeable film and a laminated non-woven fabric of spunbond, meltblown, and spunbond. As each elastic member, thread rubber or the like can be used. Various non-woven fabrics can be used as the exterior

body forming sheets

31 and 32.

Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment and can be appropriately modified. For example, the embodiment shown in FIG. 1 relates to a pants-type disposable diaper 1 having an exterior body 3 extending over a ventral side F, a crotch part M, and a dorsal side R. Instead, the present invention relates to a pants-type disposable diaper 1. The exterior body is divided into a dorsal seat member arranged on the back side of the wearer and a ventral seat member arranged on the ventral side, and the dorsal seat member and the ventral seat member are joined by a pair of side seal portions. It may be an exterior body split type pants-type disposable diaper that has a tubular shape and has an absorbent body that is bridged and fixed between the dorsal seat member and the ventral seat member. Further, the present invention may be a deployable disposable diaper instead of a pants-type disposable diaper.

In the leak-proof cuff 6 of the diaper 1 shown in FIG. 3, the joint portion 68 with the surface sheet 5 is arranged outward from the side edge of the absorber 4 along the longitudinal direction X. As a result, the fixed ends 62 of the first leak-proof cuff 6A and the second leak-proof cuff 6B are both formed outward from the side edge of the absorber 4, but the first leak-proof cuff 6A and the second leak-proof cuff 6A and the second The fixed end 62 of the leak-proof cuff 6B may be formed inward from the side edge of the absorber 4. Even in such a form, when the wearer moves his / her body in the wearing state, the slipperable range of the leak-proof cuff tends to shift following the skin. As such a form, for example, a surface sheet is arranged so as to cover the entire area of the absorber facing the skin and to be rolled down from the side edge of the absorber to the non-skin facing surface side, and the rolled-up portion of the surface sheet. And the non-woven fabric 60 of the leakage-proof cuff 6 are joined, and the joint portion formed by this joining is arranged so as to be located inward from the side edge of the absorber.

The diaper 1 shown in FIG. 3 includes a first leak-proof cuff 6A and a second leak-proof cuff 6B, but may include one of the first leak-proof cuff 6A and the second leak-proof cuff 6B. Further, both the first leak-proof cuff 6A and the second leak-proof cuff 6B have a shiftable range 66, but instead of this, one of the first leak-proof cuff 6A and the second leak-proof cuff 6B can shift. It may have a region 66.

Further, the following additional notes will be disclosed with respect to the above-described embodiment of the present invention.

<1>
A ventral portion arranged on the ventral side of the wearer and a dorsal portion arranged on the dorsal side when worn, having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction. And a vertically elongated absorbent body having a crotch located between the ventral and the dorsal, including a liquid permeable surface sheet and an absorber, and both sides of the absorbent body in the longitudinal direction. A disposable diaper having a pair of leak-proof cuffs arranged along the longitudinal direction.
The leak-proof cuff is composed of two non-woven fabrics facing each other, has a free end at one end and a fixed end at the other end, and is near both ends in the longitudinal direction. A free end telescopic portion having an end fixing portion fixed to the absorbent body and an elastic member fixed between the two non-woven fabrics via an adhesive in the vicinity of the free end. Have and
The free-end stretchable portion and the fixed end have a misalignable region in which the two non-woven fabrics are not joined, and the misalignable region is the friction between the facing surfaces of the two non-woven fabrics. The coefficient is 0.275 or less, the length along the longitudinal direction is longer than the length along the width direction, and the length along the width direction is the length along the width direction of the free end telescopic portion. A disposable diaper that is more than three times as large as.

<2>
The disposable diaper according to <1>, wherein the friction coefficient between the facing surfaces of the two non-woven fabrics constituting the shiftable region is 0.260 or less.
<3>
The disposable diaper according to <1> or <2>, wherein the two non-woven fabrics have an average deviation (MMD) of 0.012 or less of the friction coefficients of the inner surfaces facing each other in the shiftable region.
<4>
One of the above <1> to <3>, wherein the length of the free-end telescopic portion along the width direction is five times or more the length of the free-end telescopic portion along the width direction. The listed disposable diapers.
<5>
In the deployed and extended state, the length of the leak-proof cuff along the longitudinal direction is 60% or more and 95% or less with respect to the length of the leak-proof cuff along the longitudinal direction. The disposable diaper according to any one of 1> to <4>.
<6>
The disposable diaper according to any one of <1> to <5>, wherein each of the two non-woven fabrics in the shiftable area has a compression load value of 5 cN or less in the width direction.
<7>
The disposable diaper according to any one of <1> to <6>, wherein each of the two non-woven fabrics in the shiftable area has a bulk softness of 8 cN or less.
<8>
The disposable diaper according to any one of <1> to <7>, wherein the leakage-proof cuff has a deformation amount of 1 mm or more when compressed at 1 kPa.
<9>
The two non-woven fabrics in the shiftable region have a larger average deviation (MMD) of friction coefficient on the outer surface than the average deviation (MMD) of the friction coefficient on the inner surface where the non-woven fabrics face each other. The disposable diaper according to any one of 8>.
<10>
The embossed portions in which the constituent fibers are integrated with each of the two non-woven fabrics are formed in a state of being separated from each other in the plane direction, and the area ratio of the embossed portions in each non-woven fabric is 18% or less. > The disposable diaper according to any one of <9>.

<11>
The disposable diaper according to any one of <1> to <10>, wherein the two non-woven fabrics contain a lubricant.
<12>
The disposable diaper according to any one of <1> to <11>, wherein the two non-woven fabrics in the misalignable area have brushed inner surfaces on which the non-woven fabrics face each other.
<13>
The disposable diaper according to any one of <1> to <12>, wherein the main component of the constituent fibers of the two non-woven fabrics is a propylene random copolymer.
<14>
The two non-woven fabrics have an embossed portion in which the constituent fibers of each of the two non-woven fabrics are integrated, and one surface is an embossed surface having a larger undulation than the other surface. The disposable diaper according to any one of <1> to <13>, wherein the disposable diapers are opposed to each other.
<15>
In the unfolded and extended state, the thickness of the free end telescopic portion of each of the pair of the leak-proof cuffs is 0.4% or more with respect to the distance between the free ends of the pair of leak-proof cuffs along the width direction. The disposable diaper according to any one of <1> to <14>, which is 5.0% or less.
<16>
The disposable diaper according to <15>, wherein the free-end telescopic portion has a thickness of 0.3 mm or more.
<17>
The disposable diaper according to any one of <1> to <16>, wherein the distance between the free ends of the pair of leak-proof cuffs is 40 mm or more in the unfolded and extended state.
<18>
The disposable diaper according to any one of <1> to <17>, wherein the elastic member arranged on the free-end telescopic portion has a thickness of 300 dtex or more.
<19>
The disposable diaper according to any one of <1> to <18>, wherein the number of the elastic members arranged in the free-end telescopic portion is two or more.
<20>
The disposable diaper according to any one of <1> to <19>, wherein the absorbent body has a side region along the longitudinal direction standing upright when worn.

<21>
The disposable diaper according to <20>, wherein in the unfolded and extended state, the side region of the absorbent body and the misalignable region overlap in the thickness direction.
<22>
The absorber has an absorbent core and has a flexible portion composed of a pair of slits extending in the longitudinal direction or a low basis weight portion at an inward position separated from both side edges of the absorbent core at least in the inseam. The disposable diaper according to <20> or <21>, wherein the side region is a portion of the absorbent body located outward in the width direction from the flexible portion.
<23>
The disposable diaper according to <22>, wherein the free-end telescopic portion is located inward in the width direction with respect to the flexible portion in the unfolded and extended state.
<24>
The disposable diaper according to <22> or <23>, wherein the absorber has a basis weight in the side region smaller than the basis weight in the central region sandwiched between the pair of flexible portions.
<25>
The disposable diaper according to any one of <1> to <24>, wherein the friction coefficient between the non-woven fabric of the leak-proof cuff and the surface sheet is 0.275 or less.
<26>
The above-mentioned <1> to <25>, wherein the mean deviation (MMD) of the friction coefficient of each of the facing surfaces of the non-woven fabric and the surface sheet of the leakage-proof cuff is 0.012 or less. Disposable diapers.
<27>
The disposable diaper according to any one of <1> to <26>, wherein the fixed end of the leak-proof cuff is formed outward in the width direction from the side edge in the longitudinal direction of the absorber.
<28>
The disposable diaper according to any one of <1> to <26>, wherein the fixed end of the leak-proof cuff is formed inward in the width direction with respect to the side edge in the longitudinal direction of the absorber.
<29>
It has a pair of first leak-proof cuffs and a pair of second leak-proof cuffs located outside the width direction of each of the pair of first leak-proof cuffs on both sides of the absorbent body in the longitudinal direction. ,
The disposable diaper according to any one of <1> to <28>, wherein one or both of the first leak-proof cuff and the second leak-proof cuff is the leak-proof cuff having the shiftable range.
<30>
Both the first leak-proof cuff and the second leak-proof cuff are the leak-proof cuffs having the shiftable range, and the coefficient of friction between the surfaces of the first leak-proof cuff and the second leak-proof cuff that are close to each other. The disposable diaper according to <29>, wherein the coefficient is 0.275 or less.

According to the disposable diaper of the present invention, the leak-proof cuff can prevent the wearer's skin from being rubbed, and as a result, the occurrence of skin troubles can be suppressed.

Claims

A ventral portion arranged on the ventral side of the wearer and a dorsal portion arranged on the dorsal side when worn, having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction. And a vertically elongated absorbent body having a crotch located between the ventral and the dorsal, including a liquid permeable surface sheet and an absorber, and both sides of the absorbent body in the longitudinal direction. A disposable diaper having a pair of leak-proof cuffs arranged along the longitudinal direction.
The leak-proof cuff is composed of two non-woven fabrics facing each other, has a free end at one end and a fixed end at the other end, and is near both ends in the longitudinal direction. A free end telescopic portion having an end fixing portion fixed to the absorbent body and an elastic member fixed between the two non-woven fabrics via an adhesive in the vicinity of the free end. Have and
The free-end stretchable portion and the fixed end have a misalignable region in which the two non-woven fabrics are not joined, and the misalignable region is the friction between the facing surfaces of the two non-woven fabrics. The coefficient is 0.275 or less, the length along the longitudinal direction is longer than the length along the width direction, and the length along the width direction is the length along the width direction of the free end telescopic portion. A disposable diaper that is more than three times as large as.
The disposable diaper according to claim 1, wherein the friction coefficient between the facing surfaces of the two non-woven fabrics constituting the shiftable area is 0.260 or less.
The disposable diaper according to claim 1 or 2, wherein the two non-woven fabrics have an average deviation (MMD) of 0.012 or less of the friction coefficients of the inner surfaces facing each other in the shiftable region.
The disposable item according to any one of claims 1 to 3, wherein the length of the free end telescopic portion along the width direction is 5 times or more the length of the free end telescopic portion along the width direction. Diapers.
The claim that the length of the leak-proof cuff along the longitudinal direction in the unfolded and extended state is 60% or more and 95% or less of the length of the leak-proof cuff along the longitudinal direction. The disposable diaper according to any one of 1 to 4.
The disposable diaper according to any one of claims 1 to 5, wherein each of the two non-woven fabrics in the shiftable area has a compressive load value in the width direction of 5 cN or less.
The disposable diaper according to any one of claims 1 to 6, wherein each of the two non-woven fabrics in the shiftable area has a bulk softness of 8 cN or less.
The disposable diaper according to any one of claims 1 to 7, wherein the leak-proof cuff has a deformation amount of 1 mm or more when compressed at 1 kPa.
The two non-woven fabrics in the misalignable range have a larger average deviation (MMD) of friction coefficients on the outer surface than the average deviation (MMD) of the friction coefficient of the inner surfaces of the non-woven fabrics facing each other, according to claims 1 to 8. The disposable diaper according to any one of the items.
Claim 1 in which the embossed portions in which the constituent fibers are integrated with each of the two nonwoven fabrics are formed in a state of being separated from each other in the plane direction, and the area ratio of the embossed portions in each nonwoven fabric is 18% or less. The disposable diaper according to any one of 9 to 9.
The disposable diaper according to any one of claims 1 to 10, wherein the two non-woven fabrics contain a lubricant.
The disposable diaper according to any one of claims 1 to 11, wherein the two non-woven fabrics in the misalignable area have brushed inner surfaces on which the non-woven fabrics face each other.
The disposable diaper according to any one of claims 1 to 12, wherein the two non-woven fabrics are mainly composed of propylene random copolymer.
The two non-woven fabrics have an embossed portion in which the constituent fibers of each of the two non-woven fabrics are integrated, and one surface is an embossed surface having a larger undulation than the other surface. The disposable diaper according to any one of claims 1 to 13, wherein the disposable diapers are opposed to each other.
In the unfolded and extended state, the thickness of the free end telescopic portion of each of the pair of leak-proof cuffs is 0.4% or more with respect to the distance between the free ends of the pair of leak-proof cuffs along the width direction. , 5.0% or less, the disposable diaper according to any one of claims 1 to 14.
The disposable diaper according to claim 15, wherein the thickness of the free end telescopic portion is 0.3 mm or more.
The disposable diaper according to any one of claims 1 to 16, wherein the distance between the free ends of the pair of leak-proof cuffs is 40 mm or more in the unfolded and extended state.
The disposable diaper according to any one of claims 1 to 17, wherein the elastic member arranged on the free end telescopic portion has a thickness of 300 dtex or more.
The disposable diaper according to any one of claims 1 to 18, wherein the number of the elastic members arranged in the free end telescopic portion is two or more.
The disposable diaper according to any one of claims 1 to 19, wherein the absorbent body is designed so that a side region along the longitudinal direction stands up when worn.
The disposable diaper according to claim 20, wherein in the unfolded and extended state, the side region of the absorbent body and the misalignable region overlap in the thickness direction.
The absorber has an absorbent core and has a flexible portion composed of a pair of slits extending in the longitudinal direction or a low basis weight portion at an inward position separated from both side edges of the absorbent core at least in the inseam. The disposable diaper according to claim 20 or 21, wherein the side region is a portion of the absorbent body located outward in the width direction from the flexible portion.
The disposable diaper according to claim 22, wherein the free-end telescopic portion is located inward in the width direction with respect to the flexible portion in the expanded and extended state.
The disposable diaper according to claim 22 or 23, wherein the absorber has a basis weight in the side region smaller than the basis weight in the central region sandwiched between the pair of flexible portions.
The disposable diaper according to any one of claims 1 to 24, wherein the friction coefficient between the non-woven fabric of the leak-proof cuff and the surface sheet is 0.275 or less.
The disposable diaper according to any one of claims 1 to 25, wherein the mean deviation (MMD) of the friction coefficient of each of the facing surfaces of the non-woven fabric and the surface sheet of the leak-proof cuff is 0.012 or less.
The disposable diaper according to any one of claims 1 to 26, wherein the fixed end of the leak-proof cuff is formed outward in the width direction from the side edge in the longitudinal direction of the absorber.
The disposable diaper according to any one of claims 1 to 26, wherein the fixed end of the leak-proof cuff is formed inward in the width direction with respect to the side edge in the longitudinal direction of the absorber.
It has a pair of first leak-proof cuffs and a pair of second leak-proof cuffs located outside the width direction of each of the pair of first leak-proof cuffs on both sides of the absorbent body in the longitudinal direction. ,
The disposable diaper according to any one of claims 1 to 28, wherein one or both of the first leak-proof cuff and the second leak-proof cuff is the leak-proof cuff having the shiftable range.
Both the first leak-proof cuff and the second leak-proof cuff are the leak-proof cuffs having the shiftable area, and the coefficient of friction between the surfaces of the first leak-proof cuff and the second leak-proof cuff that are close to each other. 29. The disposable diaper according to claim 29, wherein the diaper is 0.275 or less.