WO2020241561A1

WO2020241561A1 - Disposable diaper

Info

Publication number: WO2020241561A1
Application number: PCT/JP2020/020516
Authority: WO
Inventors: 優子福田
Original assignee: 花王株式会社
Priority date: 2019-05-31
Filing date: 2020-05-25
Publication date: 2020-12-03
Also published as: CN216535789U; JP2020195541A; JP7283981B2; TW202106270A

Abstract

The disposable diaper (1) of the present invention an absorbent main body (2) equipped with leakproof cuffs (6) and an exterior body (3) equipped with stretchable regions in the width direction (Y). The leakproof cuffs (6) have a compressive load value in the diaper width direction of 5 cN or less in a nonwoven fabric (60) between a free end stretchable portion (64) and a fixed end portion (62). The leakproof cuffs (6) have a front side fixed portion (6F) fixed on a top sheet (5) in the vicinity of the end of the front side portion (F) in the longitudinal direction (X) and a rear side fixed portion (6R) fixed on the top sheet (5) in the vicinity of the end of the rear side portion (R) in the longitudinal direction (X). In the exterior body (3), the stretching stress of a rear side stretchable region (7R) where the rear side fixed portion (6R) is located is higher than the stretching stress of a front side stretchable region (7F) where the front side fixed portion (6F) is located.

Description

Disposable diapers

The present invention relates to disposable diapers.

For the purpose of preventing leakage of excrement, leakage-proof cuffs may be provided on both sides of the disposable diaper along the longitudinal direction of the absorber. For example, Patent Document 1 has a barrier cuff piece having a proximal edge and a distal edge, and the distal edge of the barrier cuff piece is attached to a top sheet in a cuff end connecting region located at both ends in the longitudinal direction of the diaper. Disposable diapers are disclosed.

Further, Patent Document 2 includes an absorbent main body provided with a leak-proof cuff and an outer body fixing the absorbent main body, and a ventral pressing region and a dorsal pushing region formed on the outer body by a waist elastic member. It is disclosed that in a pants-type disposable diaper having a contact area, the contraction force of the ventral pressing area is made larger than the contraction force of the dorsal pressing area.

Special Table 2009-511110 Japanese Unexamined Patent Publication No. 2012-101063

The present invention has an absorbent main body including a liquid-permeable surface sheet, an absorber and a liquid-impermeable leak-proof sheet, and an exterior body arranged on the non-skin contact surface side of the absorbent main body. When worn, it has a ventral portion arranged on the ventral side of the wearer, a dorsal portion arranged on the dorsal side, and a crotch portion located between the ventral side and the dorsal side, and a waist opening. And a pants-type disposable diaper having a pair of leg openings and having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction.
In one embodiment, the exterior body has a widthwise telescopic region in which elastic members are arranged along the width direction on the ventral side and the dorsal side.
In one embodiment, the absorbent body comprises leak-proof cuffs extending along the longitudinal direction on both sides of the longitudinal direction, the leak-proof cuff having free ends at one end in the width direction. And a fixed end at the other end.
In one embodiment, the leak-proof cuff has a free-end telescopic portion in which a leak-proof cuff elastic member is fixed to the free-end portion along the longitudinal direction, and the surface sheet is located near both ends in the longitudinal direction. It has an end fixing part fixed to.
In one embodiment, the disposable diaper has a compressive load value in the width direction of 5 cN or less in the non-woven fabric between the free end telescopic portion and the fixed end portion.
In one embodiment, the widthwise telescopic region includes a dorsal fixing portion that is the end fixing portion on the dorsal side and extends outward from the dorsal fixing portion in the width direction. A dorsal stretchable region and a ventral stretchable region including a ventral fixing portion which is the end fixing portion on the ventral side and extending outward in the width direction from the ventral fixing portion. Have.
In one embodiment, the stretch stress of the dorsal stretch region is higher than the stretch stress of the ventral stretch region.

FIG. 1 is a perspective view schematically showing an embodiment of a disposable diaper of the present invention. FIG. 2 is a plan view schematically showing a skin-facing surface side (inner surface side) in a state where the diaper shown in FIG. 1 is unfolded and fully extended. FIG. 3 is a diagram schematically showing a cross section taken along line III-III shown in FIG. FIG. 4 is a diagram schematically showing a cross section of the crotch portion of the diaper shown in FIG. 1 in a worn state. FIG. 5 is a plan view schematically showing a skin-facing surface side (inner surface side) in a state in which the diaper of another embodiment of the present invention is unfolded and fully extended. FIG. 6 is a plan view schematically showing a skin-facing surface side (inner surface side) in a state in which the diaper according to another embodiment of the present invention is unfolded and fully extended. FIG. 7 is a plan view schematically showing a skin-facing surface side (inner surface side) in a state in which the diaper according to still another embodiment of the present invention is unfolded and fully extended. FIG. 8 is a diagram schematically showing a cross section of the VIII-VIII line shown in FIG. 7.

Detailed description of the invention

The body shape of young infants is bulging, but the groin at the base of the legs is dented, and there is a large difference in unevenness. In particular, when an infant moves, the difference in unevenness becomes even larger, and even if the diaper has a leak-proof cuff, the adhesion between the skin and the diaper decreases, and leakage from the inguinal region is likely to occur.

Patent Document 1 does not describe any stretching stress in the width direction in relation to the cuff end joint region for fixing the barrier cuff piece, and the barrier cuff piece described in the same document is arranged along the inguinal region. It cannot be done and may cause leakage.

Further, Patent Document 2 does not describe any positional relationship between the fixed portions at both ends in the longitudinal direction of the leak-proof cuff and the ventral pressing region or the dorsal pressing region, and the ventral pressing region is the dorsal. The contraction force is larger than that of the side pressing area. Even with such a contractile force relationship, the fit of the leak-proof cuff to the inguinal region cannot be improved, and the skin and the leak-proof cuff hit the skin on the ventral side of the wearer. It is easy to get cuff marks due to contact.

In view of the above circumstances, the present invention has good standing of the leak-proof cuff and excellent fit to the abdomen, and in the buttocks, the leak-proof cuff and the region between them are excellent in overall fit to prevent leakage. Regarding pants-type disposable diapers with excellent effects.

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 in. The ventral portion F and the dorsal portion R are connected in a ring 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 crotch portion 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 wearing the diaper, 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 components 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.

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 body 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 crotch portion M are each divided into three regions by dividing the total length of the diaper 1 in the longitudinal direction X into three equal parts in the expanded and extended state. It is an area. 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 "expanded and extended state" is a state in which the diaper 1 is separated by the side seal portion S to be in the expanded state, and the elastic member of each part is extended to remove the influence of the elastic member. It means the state where it is expanded until it becomes the same size as when it is expanded in a plane. 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, a liquid-permeable surface sheet 5 that forms a skin-facing surface of the diaper 1, and a liquid-impervious leak-proof sheet 7. I have. The absorber 4 and the surface sheet 5, and the absorber 4 and the leak-proof sheet 7 are joined by a known joining means such as an adhesive. Like the absorbent body 2, the absorbent body 4 has a long shape in the longitudinal direction X of the diaper 1.

As shown in FIG. 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, as shown in FIG. 4, in the wearing state, the side region 2S along the longitudinal direction X of the absorbent main body 2 easily rises in the crotch portion M with the flexible portion as an axis. , It is possible to prevent excrement such as urine from flowing out in the width direction Y. In the embodiment shown in FIG. 4, the absorbent core 40 has a pair of

slits

44, 44 extending in the longitudinal direction X as a flexible portion. The slit 44 is arranged at a position inward in the width direction Y at least on both side edges of the absorbent core 40 along the longitudinal direction X at the lower crotch M. In addition to the slit 44, the absorbent core 40 has a side region 43 located outside the width direction Y from the slit 44. The side region 2S of the absorbent body 2 is formed at a position corresponding to the side region 43. When the absorbent core is provided with a low basis weight portion instead of the slit 44, the basis weight of the low basis weight portion is a high basis weight portion (a portion that is not a low basis weight portion) adjacent to the width direction Y of the low basis weight portion. ) Is preferably 80% or less based on the basis weight of the absorbent core 40. The high basis weight portion may be adjacent to at least the central side in the width direction Y of the low basis weight portion. The density of the low basis weight portion is lower than the density of the high basis weight portion adjacent to the width direction Y, but the thickness of the former is not always smaller than that of the latter, and the former and the latter are equivalent. Or, the former may be larger than the latter. A slit extending in the longitudinal direction X penetrating the absorbent core 40 or a low basis weight portion may be partially arranged in the high basis weight portion. The absorbent core 40 may have multiple layers. As a multi-layered form, for example, the absorbent core is composed of a lower layer side absorbent core and an upper layer side absorbent core, and the width of the lower layer side absorbent core is wider than the width of the upper layer side absorbent core. Can be mentioned. When the width of the lower layer side absorbent core is wider than the width of the upper layer side absorbent core, the portion of the lower layer side absorbent core located outside Y in the width direction from the side edge of the upper layer side absorbent core has a low basis weight. The portion where the upper layer side absorbent core and the lower layer side absorbent core overlap is the high basis weight portion.

The surface sheet 5 is arranged on the skin-facing surface side of the absorber 4. As shown in FIG. 3, the surface sheet 5 covers the entire area of the absorber 4 and is wound down from the side edge of the absorber 4 along the longitudinal direction X toward the non-skin facing surface side. The surface sheet 5 is arranged so as to cover the entire skin-facing surface of the absorber 4 and, in addition, cover the non-skin-facing surface side of the absorber 4 on both

side regions

43 and 43.

As shown in FIG. 3, the leak-proof sheet 7 is arranged on the non-skin facing surface side of the absorber 4. The leak-proof sheet 7 is arranged so as to cover the entire non-skin facing surface of the absorber 4. On the skin-facing surface side of the exterior body 3, the leak-proof sheet 7, the non-woven fabric 60 constituting the leak-proof cuff 6, and the absorbent main body 2 are sequentially joined by 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. As shown in FIG. 2, between the two exterior

body forming sheets

31 and 32, an elastic member extended in the width direction Y in the region from the peripheral edge of the waist opening WH to the upper end of the leg opening LH. 33 are arranged at intervals in the longitudinal direction X. The elastic member 33 is joined and fixed between the

sheets

31 and 32 in an elongated state by an arbitrary joining means such as a hot melt type adhesive. As the elastic member 33 contracts, a widthwise expansion / contraction region that expands / contracts in the width direction Y is formed in each of the ventral side F and the dorsal side R. The stretchable region in the width direction has waist gathers on the peripheral edge of the waist opening WH and waist gathers on the waist circumference. The waistline 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. A leg elastic member 34 forming leg gathers is arranged on the peripheral edge of the leg opening LH.

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 formed by using a highly flexible non-woven fabric from the viewpoint of improving the fit to the body because it is easy to stand up and bend. The flexibility of the non-woven fabric 60 constituting the leak-proof cuff 6 can be evaluated by the compressive load value. The compressive load value in the diaper width direction of the non-woven fabric 60 between the free end expansion / contraction portion 64 and the fixed end portion 62 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 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 region between the ventral fixing portion 6F and the dorsal fixing portion 6R in which the free end telescopic portion 64 in which the leak-proof cuff elastic member is fixed to the leak-proof cuff is fixed on the surface sheet 5, the absorbent body 2 A non-woven fabric 60 of 80 mm × 20 mm is cut out along the longitudinal direction X. At this time, if two non-woven fabrics are joined, they are peeled off with a solvent or the like to form one non-woven fabric. This non-woven fabric is folded along a line along the width direction at the central portion in the longitudinal direction, and further folded along a line along the width direction at the central portion in the longitudinal direction to form a quadruple measuring piece. When two non-woven fabrics of the leak-proof cuff are bonded and a non-bonded portion of 5 mm or more exists continuously along the longitudinal direction at the end in the width direction, the two bonded non-woven fabrics remain in the longitudinal direction. It may be cut out to a size of 40 mm × 20 mm along the above. If there is a non-joined portion, the two bonded non-woven fabrics are folded along a line along the width direction at the central portion in the longitudinal direction to form a quadruple measuring piece, and the non-joined portion side is measured. Wrinkles are smoothed out from the measuring piece, and the non-joint side in the folded state is sandwiched by a double clip or the like to align the non-joint parts.
The obtained quadruple measuring piece (sample width; 20 mm) is attached to the lower chuck of a compression tester (for example, Shimadzu Autograph compression tester "AG-X") with the width direction perpendicular to the end. The maximum load shown when compressed at a rate of 10 mm / min is measured with a circular compression plate having a diameter of 30 mm or more attached to the upper side so that 5 mm of the portion protrudes from the upper part of the chuck.
The length of the measurement 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 that 5 mm at the end protrudes above the chuck.
The same measurement is performed for 5 samples, and the average value thereof is taken as the compressive load value.

As shown in FIGS. 3 and 4, the leakage-proof cuff 6 is configured by arranging two

non-woven fabrics

60, 60 having a compressive 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. 3, 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.

As shown in FIGS. 3 and 4, in the free end portion 61 of the leak-proof cuff 6, one or more leak-proof cuff elastic members 63 are fixed by an adhesive between the two

non-woven fabrics

60 and 60. .. Since the leak-proof cuff elastic member 63 is fixed in an extended state along the longitudinal direction X, the leak-proof cuff 6 has a free end telescopic portion 64 at the free end portion 61.

As shown in FIG. 2, the leakage-proof cuff 6 has

end fixing portions

6F and 6R directly fixed on the surface sheet 5 of the absorbent main body 2 in the vicinity of both ends in the longitudinal direction X. The

end fixing portions

6F and 6R are formed at positions separated from each end position on the ventral side F side and the dorsal side R side in the longitudinal direction X in the free end telescopic portion 64 along the longitudinal direction X. There is. At the end on the ventral side F side, the free end 61 of the leak-proof cuff 6 is fixed on the surface sheet 5, and the ventral fixing portion 6F, which is the ventral end fixing portion, is formed. Further, at the end portion on the dorsal side R side, the free end portion 61 of the leakage-proof cuff 6 is fixed on the surface sheet 5, and the dorsal side fixing portion 6R which is the dorsal end portion fixing portion is formed. For this fixing, a known fixing method such as a heat seal, an ultrasonic seal, or a hot melt type adhesive can be used. As shown in FIG. 4, the leak-proof cuff 6 has a free-end telescopic portion 64 of the leak-proof cuff elastic member 63 when the diaper 1 is worn in an upright region between the ventral fixing portion 6F and the dorsal fixing portion 6R. By contracting, it comes to stand up at the lower crotch M. By standing the leak-proof cuff 6, it is possible to prevent excrement such as urine from flowing out in the width direction Y.

The leak-proof cuff 6 has a free end 61 at one end and a fixed end 62 at the other end of both ends in the width direction Y. A free end telescopic portion 64 is formed in the free end portion 61 in an upright region of the leakage-proof cuff 6. As shown in FIG. 3, the end of the leak-proof cuff 6 opposite to the free end 61 is joined to the surface sheet 5 wound up on the non-skin facing surface side of the side region 43 of the absorber 4. There is. By this joining, the leak-proof cuff 6 has a fixed end 62 at a position inward in the width direction Y with respect to the side edge of the absorber 4 along the longitudinal direction X. For this bonding, a known bonding method such as heat seal, ultrasonic seal, hot melt type adhesive or the like can be used. The fixed end 62 extends along the side edge of the absorbent body 2.

As shown in FIGS. 2 and 3, the leak-proof cuff 6 has a bent portion 66 in which the leak-proof cuff 6 is bent between the free end portion 61 and the fixed end portion 62 in the extended unfolded state. There is. In the bent leak-proof cuff 6, the region between the free end portion 61 and the bent portion 66 is folded back on the skin-facing surface of the absorbent body 2. The bent portion 66 is located outside the free end portion 61 in the width direction Y. The leak-proof cuff 6 bent in this way is a so-called inward folding type.

The leak-proof cuff 6 may or may not have an elastic member at the bent portion 66. In the embodiment shown in FIG. 2, the leak-proof cuff 6 has one elastic member 67 at the bent portion 66 from the viewpoint that the leak-proof cuff 6 is easily bent. The elastic member 67 extending along the longitudinal direction X is fixed by an adhesive between the two

non-woven fabrics

60 and 60 at the crotch portion M.

As shown in FIG. 2, a stretchable region in the width direction is continuously formed in the exterior body 3 in the width direction Y between the waist opening and the leg opening. The widthwise stretchable region has a ventral stretchable region 7F including a ventral fixed portion 6F and a dorsal stretchable region 7R including a dorsal fixed portion 6R. The ventral telescopic region 7F is a region including the ventral fixing portion 6F and extending outward from the ventral fixing portion 6F in the width direction Y. On the other hand, the dorsal telescopic region 7R includes the dorsal fixing portion 6R and extends outward from the dorsal fixing portion 6R in the width direction Y. The stretching stress of the dorsal stretching region 7R is higher than the stretching stress of the ventral stretching region 7F. The expansion / contraction region located at the

end fixing portions

6F and 6R as described above is the longitudinal length of the

end fixing portions

6F and 6R when the expansion / contraction region in the width direction is viewed along the longitudinal direction X in the expanded state shown in FIG. The area at the same position as the position in the direction X. The position of the

end fixing portions

6F, 6R in the longitudinal direction X is the position of the

end fixing portions

6F, 6R at the longest portion in the longitudinal direction X. Therefore, the length of the

telescopic regions

7F and 7R in the longitudinal direction X coincides with the longest length of the

end fixing portions

6F and 6R in the longitudinal direction X.

The expansion /

contraction regions

7F and 7R located at the

end fixing portions

6F and 6R are on the surface sheet 5 of the absorbent body 2 when they are inwardly folded type cuffs as in the leak-proof cuff 6 shown in FIG. Since there is only one

end fixing portion

6F, 6R, it can be specified based on the

end fixing portion

6F, 6R. On the other hand, as in the case of the leak-proof cuff 6 shown in FIG. 7, which will be described later, when the cuff is an outward folding type, there are two

end fixing portions

6F and 6R on the surface sheet 5 of the absorbent main body 2. When there are a plurality of

end fixing portions

6F and 6R in this way, the expansion and

contraction regions

7F and 7R are specified based on the

end fixing portions

6F and 6R closest to the skin facing surface.

According to the diaper 1 of the present embodiment, the non-woven fabric 60 in the region between the free end expansion / contraction portion 64 and the fixed end portion 62 is flexible with a compressive load value of 5 cN or less, and the ventral fixed portion 6F. Since the pressing force on the skin is lower than that on the back side fixing portion 6R side, the responsiveness to the tension of the leak-proof cuff elastic member 63 is good, and even if the leak-proof cuff 6 is bent once, its resilience is high. The leak-proof cuff 6 has good uprightness and excellent fit to the abdomen, for example, the inguinal region.
On the other hand, since the dorsal stretchable region 7R has a higher stretchable stress than the ventral stretchable region 7F, the leak-proof cuff 6 and the region in between are excellent in fit to the skin as a whole in the buttocks. Moreover, since the stretching stress of the ventral stretching region 7F on the ventral side F side is relatively low, even if the leak-proof cuff 6 is brought into close contact with the skin on the ventral side of the wearer, the skin and the leak-proof cuff come into contact with each other. It is difficult to leave a cuff mark due to. Diaper 1 is particularly effective for young children up to 10 months old.

In the wearing state, the entire area between the leak-proof cuff 6 and the leak-proof cuff 6 is brought into close contact with the skin along the dent of the waist on the dorsal side R, or the leak-proof cuff 6 is attached to the abdomen on the ventral side F. From the viewpoint of standing up along the boundary between the bulge and the inguinal region and fitting the infant to the complex uneven body shape, the stretching stress of the dorsal stretching region 7R is 1.04 with respect to the stretching stress of the ventral stretching region 7F. It is preferably times or more, 1.05 times or more, more preferably 2.0 times or less, further preferably 1.8 times or less, and 1.04 times or more. It is preferably 2.0 times or less, and more preferably 1.05 times or more and 1.8 times or less. In the dorsal side R, the stretching stress of the dorsal stretching region 7R is preferably 0.8 cN / mm or more, and preferably 1.0 cN / mm or more, from the viewpoint of bringing the leakage-proof cuff 6 into close contact with the skin. More preferably, it is preferably 7.0 cN / mm or less, further preferably 6.0 cN / mm or less, and preferably 0.8 cN / mm or more and 7.0 cN / mm or less. It is more preferably 0 cN / mm or more and 6.0 cN / mm or less. In the ventral side F, the stretching stress of the ventral stretching region 7F is preferably 0.6 cN / mm or more, preferably 0.8 cN / mm or more, from the viewpoint of erecting the leakage-proof cuff 6 along the inguinal region. It is more preferably 5.5 cN / mm or less, more preferably 4.5 cN / mm or less, and preferably 0.6 cN / mm or more and 5.5 cN / mm or less. , 0.8 cN / mm or more and 4.5 cN / mm or less is more preferable. The stretch stress of the

stretch regions

7F and 7R is measured by the following method.

[Measurement method of tensile stress]
Taking the above-mentioned diaper 1 as an example, the side seal portion S of the diaper 1 is peeled off, the diaper 1 is in the expanded state, and the stretchable stress measurement target portion is formed on a flat surface from the exterior body 3 in the extended state. It is cut out as a measurement sample having a rectangular shape that is long in the width direction Y. At the time of this cutting, not only the exterior body but also the entire diaper including the absorbent body and the like are cut. First, a region existing at the same position as the position of the ventral fixed portion 6F in the longitudinal direction X is cut out from the stretchable region in the width direction of the stretched diaper, and this is used as a measurement sample of the ventral stretchable region 7F. Similarly, a region existing at the same position as the position of the dorsal fixed portion 6R in the longitudinal direction X is cut out from the stretchable region in the width direction, and this is used as a measurement sample of the dorsal stretchable region 7R. For each of the cut-out measurement samples, the length of the diaper 1 in the longitudinal direction X and the length of the diaper 1 in the width direction Y are measured. Next, the measurement sample is fixed between the chucks of a tensile tester (for example, "RTA-100" manufactured by Orientec Co., Ltd.) so that the longitudinal direction and the tensile direction of the measurement sample coincide with each other. The distance between the chucks is 100 mm. Then, the measurement sample is fixed between the chucks, and the distance between the chucks is increased at a speed of 300 mm / min to a length at which the elongation of the measurement sample becomes 80, and then until the elongation at which the measurement sample becomes 71. The tensile load (N) when reduced is measured, and this is taken as the stress (N) of the measurement sample. The degree of elongation is the ratio of the length in the longitudinal direction of the measurement sample elongated in the longitudinal direction of the measurement sample to the total length when the total length in the longitudinal direction of the measurement sample is 100. For example, when the length of the measurement sample in the longitudinal direction is 350 mm, the length of the measurement sample in the longitudinal direction at the degree of elongation 80 is 280 mm, and the length in the longitudinal direction of the measurement sample at the degree of elongation 71 is 250 mm. Then, the value obtained by dividing the obtained stress (N) by the length X in the longitudinal direction of the diaper 1 measured in advance is defined as the stretch stress (cN / mm) of the measurement sample.

In order to increase the stretching stress of the dorsal stretching region 7R more than the stretching stress of the ventral stretching region 7F, for example, the elastic member 33 arranged in the dorsal stretching region 7R exists per type, thickness, and longitudinal direction X1 cm. It is possible to make the number of pieces to be formed, the expansion ratio, etc. different from the elastic member 33 arranged in the ventral expansion / contraction region 7F. Specifically, it is preferable to combine any one of the following configurations (1) to (3), or two or more of these.
Configuration (1) When the elastic members 33 arranged in the dorsal elastic region 7R and the ventral elastic region 7F are filamentous, they exist per the longitudinal direction X1 cm of the elastic members 33 arranged in the dorsal elastic region 7R. The number of elastic members (number per unit area) is set to be larger than the number of elastic members 33 arranged in the ventral telescopic region 7F.
Configuration (2) When the elastic members 33 arranged in the dorsal elastic region 7R and the ventral elastic region 7F are filamentous, the average thickness of each elastic member 33 arranged in the dorsal elastic region 7R is set to the belly. It is made larger than the average thickness of each elastic member 33 arranged in the side expansion / contraction region 7F. The thickness of all elastic members arranged in the stretchable region in the non-stretched state is obtained, and the average value thereof is defined as the "average thickness".
Configuration (3) When the elastic members 33 arranged in the dorsal stretchable region 7R and the ventral stretchable region 7F are filamentous, the average elongation ratio of each elastic member 33 arranged in the dorsal stretchable region 7R is set to the abdomen. It is made larger than the average elongation ratio of each elastic member 33 arranged in the side expansion / contraction region 7F. The elongation ratio is measured by the following method.

[Measurement method of elongation]
First, in a state where the expansion / contraction region is extended to the maximum in the expansion / contraction direction, two marks are made on the elastic member from the sheet at regular intervals L ₀ (example: 100 mm) in the expansion / contraction direction using an oil-based pen. At this time, since the ink of the oil-based pen soaks from the sheet, the elastic member can be marked. Next, the space between the two marks is cut out from the elastic member in the expansion / contraction region. The length L ₁ of the cut out elastic member is measured in a non-extended state. Next, the elongation ratio is calculated by the following formula [A].
Magnification (%) = (L ₀ / L ₁ ) x l00 ... [A]
The elongation ratio is obtained for all the elastic members arranged in the expansion / contraction region, and the average value thereof is defined as the "average elongation ratio".

In the ventral portion F, the exterior body 3 shown in FIG. 2 has a waist end portion of the waist opening WH from the outer end of the ventral elastic region 7F in the longitudinal direction X, that is, an end portion of the ventral side portion F in the longitudinal direction X. A stretchable region 71F on the waist end side is provided in a portion located on the side. The stretchable region 71F is a ventral low stretchable stress region having a lower stretchable stress than the ventral stretchable region 7F. Since it is configured in this way, it is difficult for gather marks on the elastic region 71F to be formed on the skin on the ventral side. Further, a stretchable region 72F on the leg opening LH side is provided at a portion of the ventral stretchable region 7F located on the leg opening LH side from the inner end in the longitudinal direction X. The stretchable region 72F has a higher stretchable stress than the ventral stretchable region 7F. With this configuration, the leak-proof cuff 6 tends to stand up along the inguinal region on the ventral side F. The stretching stress of the stretching

regions

71F and 72F is measured by the same method as the stretching stress of the stretching

regions

7F and 7R described above.

From the viewpoint of making it difficult for gather marks on the elastic region 71F to be formed on the skin on the ventral side, the elastic stress of the ventral elastic region 7F is preferably 1.04 times or more, preferably 1.05 times the elastic stress of the elastic region 71F. It is more preferably more than twice, more preferably 2.0 times or less, further preferably 1.8 times or less, and more preferably 1.04 times or more and 2.0 times or less. It is more preferably 1.05 times or more and 1.8 times or less.

In the dorsal side portion R, the exterior body 3 shown in FIG. 2 has a waist end portion of the waist opening WH from the outer end of the dorsal side expansion / contraction region 7R in the longitudinal direction X, that is, an end portion of the dorsal side portion R in the longitudinal direction X. A stretchable region 71R on the waist end side is provided in a portion located on the side. The stretchable region 71R is a dorsal low stretchable stress region having a lower stretchable stress than the dorsal stretchable region 7R. Since it is configured in this way, it is difficult for the gather marks of the elastic region 71R to be attached to the skin on the back side. Further, the expansion / contraction region 71R includes a first expansion / contraction region R1 up to a position 40 mm downward from the peripheral edge of the waist opening WH and a second expansion / contraction region R2 from the 40 mm distance to the upper end of the leg opening LH. It has two categories. Both the first stretchable region R1 and the second stretchable region R2 have lower stretchable stress than the dorsal stretchable region 7R. The first expansion / contraction region R1 has a lower expansion / contraction stress than the second expansion / contraction region R2. Since it is configured in this way, the leak-proof cuff 6 easily adheres to the skin on the dorsal side R. The stretching stress of the stretching regions 71R, R1 and R2 is measured by the same method as the stretching stress of the stretching

regions

7F and 7R described above.

From the viewpoint of making it difficult for gather marks of the elastic region 71R to be formed on the skin on the dorsal side, the elastic stress of the dorsal elastic region 7R is preferably 1.1 times or more with respect to the elastic stress of the elastic region 71R, preferably 1.15. It is more preferably more than twice, more preferably 2.0 times or less, further preferably 1.8 times or less, and preferably 1.1 times or more and 2.0 times or less. It is more preferably 1.15 times or more and 1.8 times or less.

From the viewpoint of making the stretching stress of the dorsal stretching region 7R higher than the stretching stress of the ventral stretching region 7F, in the deployed state shown in FIG. 2, the length Lf1 of the ventral fixing portion 6F in the longitudinal direction X is the dorsal fixing portion. It is preferably shorter than the length Lr1 of the longitudinal direction X of 6R. The length of the end fixing portion in the longitudinal direction X means the longest length of the end fixing portion in the longitudinal direction X. The length Lr1 with respect to the length Lf1 is preferably 1.1 times or more, more preferably 1.2 times or more, and preferably 2.0 times or less, and 1.8 times or less. It is more preferably 1.1 times or more and 2.0 times or less, and further preferably 1.2 times or more and 1.8 times or less. The length Lf1 is preferably 30 mm or more, more preferably 35 mm or more, and 65 mm or less from the viewpoint that the leakage-proof cuff 6 easily stands up along the inguinal region in the ventral portion F. Is more preferable, 60 mm or less is more preferable, and 30 mm or more and 65 mm or less is preferable, and 35 mm or more and 60 mm or less is further preferable. From the viewpoint that the leak-proof cuff 6 easily adheres to the skin on the dorsal side R, the length Lr1 is preferably 40 mm or more, more preferably 45 mm or more, and more preferably 70 mm or less. It is more preferably 65 mm or less, more preferably 40 mm or more and 70 mm or less, and further preferably 45 mm or more and 65 mm or less.

In the wearing state, the entire area between the leak-proof cuff 6 and the leak-proof cuff 6 is brought into close contact with the skin along the dent of the waist on the dorsal side R, or the leak-proof cuff 6 is attached to the abdomen on the ventral side F. From the viewpoint of standing up along the boundary between the bulge and the inguinal region and fitting to the complex uneven body shape of the infant, in the deployed state shown in FIG. 2, from the waist end to the ventral fixation portion on the ventral side F side. It is preferable that the distance Lf2 to the end on the crotch M side is shorter than the distance Lr2 from the waist end on the dorsal R side to the end on the crotch M side of the dorsal fixing portion 6R.
The distance Lf2 is the distance between the peripheral edge of the waist opening WH and the lower end of the ventral fixed portion 6F on the M side of the crotch in the deployed state shown in FIG. Similarly, the distance Lr2 is the distance between the peripheral edge of the waist opening WH and the lower end of the dorsal fixed portion 6R on the M-side of the crotch. The distance Lr2 with respect to the distance Lf2 is preferably 1,05 times or more, more preferably 1.1 times or more, more preferably 1.5 times or less, and preferably 1.4 times or less. Is more preferable, and 1.05 times or more and 1.5 times or less is preferable, and 1.1 times or more and 1.4 times or less is further preferable. The length Lf2 is preferably 50 mm or more, more preferably 55 mm or more, and more preferably 105 mm or less, from the viewpoint that the leakage-proof cuff 6 easily stands up along the inguinal region in the ventral portion F. It is more preferably 100 mm or less, more preferably 50 mm or more and 105 mm or less, and further preferably 55 mm or more and 100 mm or less. From the viewpoint that the leak-proof cuff 6 easily adheres to the skin on the dorsal side R, the length Lr2 is preferably 60 mm or more, more preferably 65 mm or more, and more preferably 130 mm or less. It is more preferably 120 mm or less, more preferably 60 mm or more and 130 mm or less, and further preferably 65 mm or more and 120 mm or less.

From the viewpoint that the leak-proof cuff 6 is more likely to stand up on the ventral side F side than the dorsal side R side, and the leak-proof cuff 6 is easier to stand up along the inguinal region on the ventral side F, the ventral side F side. The distance Lf3 from the waist end to the ventral F-side end of the free end telescopic portion 64 is from the waist end on the dorsal R side to the dorsal R side end of the free end telescopic portion 64. It is preferably shorter than the distance Lr3. The distance Lf3 is the distance between the peripheral edge of the waist opening WH on the ventral side F and the end of the free end telescopic portion 64 closest to the waist opening WH in the deployed state shown in FIG. Similarly, the distance Lr3 is the distance between the peripheral edge of the waist opening WH on the dorsal side R and the end of the free end telescopic portion 64 closest to the waist opening WH. The end of the free end telescopic portion 64 shifts two pieces of the non-woven fabric 60 constituting the leak-proof cuff in the vicinity of the position assumed to be the end of the free end telescopic portion 64 in the contracted leak-proof cuff 6. By rubbing in this way, the end portion where the leak-proof cuff elastic member is joined to the non-woven fabric 60 can be specified, and the end portion can be specified as the end of the free end expansion / contraction portion 64.

The distance Lr3 with respect to the distance Lf3 is preferably 1.05 times or more, more preferably 1.1 times or more, more preferably 3.0 times or less, and 2.5 times or less. Is more preferable, and 1.05 times or more and 3.0 times or less is preferable, and 1.1 times or more and 2.5 times or less is further preferable. The length Lf3 is preferably 50 mm or more, more preferably 55 mm or more, and 120 mm or less from the viewpoint that the leak-proof cuff 6 easily stands up along the inguinal region in the ventral portion F. It is more preferably 110 mm or less, more preferably 50 mm or more and 120 mm or less, and further preferably 55 mm or more and 110 mm or less. From the viewpoint that the leak-proof cuff 6 easily adheres to the skin on the dorsal side R, the length Lr3 is preferably 60 mm or more, more preferably 65 mm or more, and more preferably 140 mm or less. It is more preferably 130 mm or less, more preferably 60 mm or more and 140 mm or less, and further preferably 65 mm or more and 130 mm or less.

From the viewpoint that the leak-proof cuff 6 easily adheres to the dorsal portion R along the buttocks, unlike the embodiment shown in FIG. 2, at least the dorsal portion R of the ventral portion F and the dorsal portion R It is preferable that the free end telescopic portion 64 and the dorsal side fixing portion 6R partially overlap in the thickness direction, from the waist end portion on the dorsal side R side to the end portion of the free end telescopic portion 64 on the dorsal side R side. It is preferable that the distance Lr3 to is less than or equal to the distance Lr2 from the waist end on the dorsal R side to the end on the crotch M side of the dorsal fixing portion 6R. The distance Lr2 with respect to the distance Lr3 is preferably 1.0 times or more, more preferably 1.05 times or more, preferably 1.4 times or less, and 1.3 times or less. Is more preferable, and 1.0 times or more and 1.4 times or less is preferable, and 1.05 times or more and 1.3 times or less is further preferable. From the viewpoint that the leak-proof cuff 6 easily stands up along the inguinal region in the ventral side F, the free end expansion / contraction portion 64 and the ventral fixed portion 6F partially overlap in the thickness direction in the ventral side F. The distance Lf3 from the waist end on the ventral F side to the ventral F side end of the free end telescopic portion 64 is from the waist end on the ventral F side to the ventral fixed portion 6F. It is preferable that the distance to the end of the crotch portion M side is Lf2 or less. The distance Lf2 with respect to the distance Lf3 is preferably 1.0 times or more, more preferably 1.05 times or more, preferably 1.7 times or less, and 1.5 times or less. Is more preferable, and 1.0 times or more and 1.7 times or less is preferable, and 1.05 times or more and 1.5 times or less is further preferable.

The belly of the absorbent body 2 from the viewpoint that the leak-proof cuff 6 is more likely to stand up on the ventral side F side than the dorsal side R side, and the leak-proof cuff 6 is easier to stand up along the inguinal region on the ventral side F. The distance Lf4 from the end on the side F side to the end on the ventral side F side of the free end telescopic portion 64 is from the end on the dorsal side R side of the absorbent body 2 to the dorsal side of the free end telescopic portion 64. The distance to the end on the R side is preferably shorter than Lr4. The distance Lf4 is the distance between the end of the absorbent body 2 closest to the waist opening WH and the end of the free end telescopic portion 64 closest to the waist opening WH in the ventral side F in the deployed state shown in FIG. .. Similarly, the distance Lr4 is the distance between the end of the absorbent body 2 closest to the waist opening WH and the end of the free end telescopic portion 64 closest to the waist opening WH on the dorsal side R.

The distance Lr4 with respect to the distance Lf4 is preferably 1.1 times or more, more preferably 1.2 times or more, preferably 2.0 times or less, and 1.8 times or less. Is more preferable, and 1.1 times or more and 2.0 times or less is preferable, and 1.2 times or more and 1.8 times or less is further preferable. The length Lf4 is preferably 25 mm or more, more preferably 30 mm or more, and 70 mm or less from the viewpoint that the leakage-proof cuff 6 easily stands up along the inguinal region in the ventral portion F. It is more preferably 65 mm or less, more preferably 25 mm or more and 70 mm or less, and further preferably 30 mm or more and 65 mm or less. From the viewpoint that the leak-proof cuff 6 easily adheres to the skin on the dorsal side R, the length Lr4 is preferably 30 mm or more, more preferably 35 mm or more, and more preferably 80 mm or less. It is more preferably 70 mm or less, more preferably 30 mm or more and 80 mm or less, and further preferably 35 mm or more and 70 mm or less.

It is preferable that at least one of the ventral fixing portion 6F and the dorsal fixing portion 6R overlaps the elastic member 33 arranged in the ventral telescopic region 7F or the dorsal telescopic region 7R in the thickness direction. With such a configuration, the stretching stress of the ventral stretching region 7F or the dorsal stretching region 7R is easily transmitted to the leakage-proof cuff 6 via the ventral fixing portion 6F or the dorsal fixing portion 6R, and is prevented from being worn. The leak cuff 6 is likely to stand up. The elastic member 33 that overlaps the ventral fixing portion 6F or the dorsal fixing portion 6R in the thickness direction is excluding the end portion of the elastic member 33 that does not exhibit the expansion / contraction performance in the width direction Y. , Means a portion having elasticity in the width direction Y. From the viewpoint that the leak-proof cuff 6 easily stands up along the inguinal region in the ventral region F, the ventral fixing portion 6F overlaps with the elastic member 33 arranged in the ventral telescopic region 7F in the thickness direction. preferable.

The elastic member 33 shown in FIG. 2 is located at a position where at least a part on the crotch portion M side overlaps with the region 2T sandwiched between the inner edges of the

side region

2S and 2S among the portions overlapping with the absorbent body 2. It is finely divided and exists in a state of being divided (not shown). The fragmented body is no longer in a state of exhibiting the contractile force of the elastic member. On the other hand, the elastic member 33 exerts a contraction force from the outer edge of the side region 2S to the outside in the width direction Y, including a position overlapping the side region 2S, and gathers around the waist are formed. In the embodiment shown in FIG. 2, the ventral fixing portion 6F overlaps the elastic member 33 arranged in the ventral telescopic region 7F in the thickness direction, and in addition, the dorsal fixing portion 6R is arranged in the dorsal telescopic region 7R. It overlaps with the elastic member 33 in the thickness direction. With such a configuration, as shown in FIG. 4, in the wearing state, the side region 2S of the absorbent body 2 is likely to rise in the crotch portion M with the slit 44 of the absorbent core 40 as the axis. In addition, the standing property of the leak-proof cuff 6 is further improved when worn. Further, as described above, since the leak-proof cuff 6 is joined to the surface sheet 5 wound up on the non-skin facing surface side of the side region 43 of the absorber 4, the leak-proof cuff 6 is erected. The side region 43 of the absorber 4 is likely to stand up in the crotch portion M, and is more likely to fit the skin in the crotch portion M. Further, since the body fluid can be absorbed from the non-skin facing surface side of the side region 43, the leakage prevention effect is improved.

The leak-proof cuff 6 is formed by using a highly flexible non-woven fabric from the viewpoint of improving the fit to the body because it is easy to stand up and bend. The leak-proof cuff 6 is formed by using, for example, a non-woven fabric 60 having a bulk softness of preferably 10 cN or less. From the same viewpoint, the bulk softness of the nonwoven fabric 60 is more preferably 10 cN or less, and even more preferably 8 cN or less. 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, sufficient softness can be imparted to the leak-proof cuff 6. 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, the non-woven fabric constituting the leak-proof cuff 6 or the non-woven fabric used for the leak-proof cuff 6 is 150 mm in the CD direction along the orientation direction of the constituent fibers and orthogonal to the CD direction. Cut out 30 mm in the MD direction and use this as a measurement piece. This measuring piece is stapled at two upper and lower ends using a stapler so as to form a ring with a diameter of 45 mm. At this time, the stapler core is made longer in the CD direction. Next, using a compression tester (for example, Shimadzu Autograph compression tester "AG-X"), 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 shown when compressed at a compression rate of 10 mm / min with a circular compression plate having a diameter of 30 mm or more is measured. This measurement is performed at any three points cut out from the leak-proof cuff, and the average value of these is taken as bulk softness.

From the viewpoint of improving the feel to the touch, the average deviation (MMD) of the friction coefficient of the non-woven fabric 60 constituting the leak-proof cuff 6 is preferably 0.012 or less, and more preferably 0.01 or less. The lower limit of the average deviation MMD of the friction coefficient in the non-woven fabric 60 is preferably closer to 0, but if it is 0.003 or more, sufficient softness can be imparted to the leakage-proof cuff 6.

From the viewpoint of improving the feel on the skin, the non-woven fabric 60 constituting the leak-proof cuff 6 preferably has an average deviation SMD of its surface roughness of 2.2 μm or less, and more preferably 2.0 μm or less. The lower limit of the average deviation SMD of the surface roughness of the non-woven fabric 60 is preferably closer to 0, but if it is 0.5 μm or more, sufficient softness can be imparted to the leak-proof cuff 6.

The mean deviation MMD of friction coefficient and the mean deviation SMD of surface roughness are measured by the following method using KESFB4-AUTO-A (trade name) manufactured by Kato 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]
A 20 cm × 20 cm test piece is taken out from the non-woven fabric constituting 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 attached to a test table on a smooth metal surface. 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 contact is made by arranging 20 piano wires having the same diameter of 0.5 mm as the contact used for measuring the surface roughness and bending them into a U shape with a width of 10 mm. The contact surface of the contactor is pressed against the test piece by a weight with a force of 49 cN. The measured value of the mean deviation of the coefficient of friction is represented by the MMD value. This measurement is performed for both _MD and _CD to obtain MMD _MD and MMD _CD , and the average value is calculated from the following formula [B], which is used as the average deviation MMD of the friction coefficient. If only one of MD and CD can be taken out as a sample test piece, the value of only one is taken as the mean deviation MMD of the friction coefficient. The MD is the flow direction at the time of manufacturing the non-woven fabric or the longitudinal direction of the diaper, and the CD is the direction orthogonal to the MD.
Mean deviation of friction coefficient MMD
= {(MMD _MD ² + MMD _CD ² ) / 2} ^1/2 ... [B]

[Measurement method of mean deviation SMD of surface roughness]
A 20 cm × 20 cm test piece is taken out from the non-woven fabric forming 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. Attach the test piece to a test table on a smooth metal surface. The contact is crimped to the test piece with 9.8 cN (within ± 0.49 cN error). 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 contact is a piano wire having a diameter of 0.5 mm bent into a U shape with a width of 5 mm. The contact surface of the contactor is pressed against the test piece with a force of 9.8 cN. The contacts are spring-loaded. The spring constant shall be 24.5 cN / mm (within ± 0.98 cN / mm error), and the resonance frequency shall be 30 Hz or more in a state away from surface contact. The measured value of the average deviation of the surface roughness is represented by the SMD value. This measurement is performed for both _MD and _CD to obtain SMD _MD and SMD _CD , and the average value is calculated from the following formula [C], which is used as the average deviation SMD of the surface roughness. If only one of MD and CD can be taken out as a sample test piece, the value of only one is defined as the surface roughness SMD. The definitions of MD and CD are as described above.
Average deviation of surface roughness SMD
= {(SMD _MD ² + SMD _CD ² ) / 2} ^1/2 ... [C]

The leak-proof cuff 6 has a good feel on the skin, and the amount of deformation of the leak-proof cuff 6 at 1 kPa compression is small from the viewpoint that the cuff marks caused by the contact between the skin and the leak-proof cuff 6 are less likely to adhere to the skin. It is preferably 1 mm or more, more preferably 1.1 mm or more. The amount of deformation at the time of 1 kPa compression is measured by the following method.

[Measurement method of deformation amount at 1 kPa compression]
The leak-proof cuff is taken out from the disposable diaper, and with the leak-proof cuff extended, a test piece having a width of 5 mm from the free end portion 61 and a length of 120 mm in the longitudinal direction is cut out so as to include the free end telescopic portion 64, and the test piece is cut out. Is attached to the test stand of the measuring device in a state of being extended to 70 mm. At this time, the leak-proof cuff elastic member is arranged so as to be located in 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

Next, the present invention will be described based on another embodiment with reference to the drawings. 5 to 7 show another embodiment of the pants-type disposable diaper. The diapers according to these embodiments will be described as being different from the diapers according to the above-described embodiments. The points not particularly described are the same as those of the diaper according to the above-described embodiment, and the description of the diaper is appropriately applied. The diapers of these embodiments also have the same effects as the diapers of the above-described embodiments.

In the diaper 1A shown in FIG. 5, the absorbent main body 2 extends to the waist opening WH side in the dorsal side R as compared with the diaper 1 shown in FIG. Further, the length Lr1 of the dorsal fixing portion 6R in the longitudinal direction X is longer than the length Lr1 of the dorsal fixing portion 6R of the diaper 1 shown in FIG. In the diaper 1A shown in FIG. 5, the length Lf1 of the ventral fixing portion 6F is shorter than the length Lr1 of the dorsal fixing portion 6R. In the dorsal portion R of the diaper 1A, the dorsal telescopic region 7R located at the dorsal fixed portion 6R is divided into two at the center of the longitudinal direction X, and the third telescopic region R3 on the leg opening LH side and the third telescopic region R3. It has a fourth telescopic region R4 on the WH side of the waist opening. The stretching stress of the fourth stretching region R4 is substantially the same as the stretching stress of the ventral stretching region 7F. The stretching stress of the third stretching region R3 is higher than the stretching stress of the ventral stretching region 7F. The stretching stress of the dorsal stretching region 7R is obtained by averaging the stretching stress of the fourth stretching region R4 and the stretching stress of the third stretching region R3, and the dorsal stretching region 7R of the diaper 1A is obtained from the ventral stretching region 7F. Also, the tensile stress is high. The stretchable region 71R from the dorsal stretchable region 7R to the waist end side is a dorsal low stretchable stress region having a lower stretchable stress than the fourth stretchable region R4.

In the diaper 1B shown in FIG. 6, the absorbent main body 2 extends to the waist opening WH side on the dorsal side R as compared with the diaper 1 shown in FIG. The diaper 1B has a dorsal telescopic region 7R located at the dorsal fixing portion 6R, a dorsal telescopic region 7R to the waist end side, a dorsal telescopic region 71R, and a dorsal telescopic region. It has an expansion / contraction region 72R from 7R on the leg opening LH side. The dorsal stretchable region 7R of the diaper 1B has a stretchable stress higher than the stretchable stress of the ventral stretchable region 7F. The stretchable region 72R of the diaper 1B has a lower stretchable stress than the dorsal stretchable region 7R of the diaper 1B. The stretchable region 71R of the diaper 1B is a dorsal low stretchable stress region having a lower stretchable stress than the stretchable region 72R and the dorsal stretchable region 7R of the diaper 1B.

In the diaper 1C shown in FIG. 7, the absorbent main body 2 extends to the waist opening WH side in the dorsal side R as compared with the diaper 1 shown in FIG. The leak-proof cuff 6 of the diaper 1C has a different folding shape from the diaper 1 shown in FIG. As shown in FIG. 8, the leak-proof cuff 6 of the diaper 1C has a bent portion 66 in which the leak-proof cuff 6 is bent. The bent portions 66 are located at intervals inward in the width direction Y from the side edges of the absorber 4 along the longitudinal direction X. The free end portion 61 is located outside Y in the width direction with respect to the bent portion 66. The leak-proof cuff 6 of the diaper 1C bent in this way is a so-called outer folding type. The outer folding type leak-proof cuff 6 has a plurality of end fixing portions fixed on the surface sheet 5 of the absorbent main body 2. Specifically, in the outer folding type leak-proof cuff 6, the ventral fixing portion 6F and the dorsal fixing portion 6R are each on the surface of the absorbent main body 2 from the bent portion 66 to the fixed end portion 62 side. The first end fixing portion 6A directly fixed on the sheet 5 and the second end portion in which the portion from the bent portion 66 to the free end portion 61 side is indirectly fixed on the surface sheet 5 of the absorbent main body 2. It has a fixed portion 6B. The second end fixing portion 6B is formed by fixing a portion from the bent portion 66 to the free end portion 61 side and a portion from the bent portion 66 to the fixed end portion 62 side on the surface sheet 5. It is fixed on the sheet 5.

When there are a plurality of end fixing portions as in the diaper 1C shown in FIG. 7, as described above, the expansion / contraction region is specified based on the fixing portion on the side facing the skin most. In the diaper 1C, the expansion / contraction region 7R located at the second end fixing portion 6B on the skin facing surface side of the dorsal fixing portion 6R is located at the second end fixing portion 6B on the skin facing surface side of the ventral fixing portion 6F. The stretching stress is higher than that of the stretching region 7F.

The expansion shown in FIG. 7 is shown from the viewpoint that the stretching stress of the dorsal stretching region 7R is higher than the stretching stress of the ventral stretching region 7F, and the leakage-proof cuff 6 easily stands up along the inguinal region in the ventral region F. In the state, it is preferable that the length Lf5 of the first end fixing portion 6A in the ventral side F in the longitudinal direction X is longer than the length Lf6 of the second end fixing portion 6B in the longitudinal direction X. The length of the end fixing portion in the longitudinal direction X means the longest length of the end fixing portion in the longitudinal direction X. The length Lf5 with respect to the length Lf6 is preferably 1.3 times or more, more preferably 1.5 times or more, more preferably 3.0 times or less, and 2.5 times or less. It is more preferably 1.3 times or more and 3.0 times or less, and further preferably 1.5 times or more and 2.5 times or less. The length Lf5 of the ventral portion F is preferably 30 mm or more, more preferably 35 mm or more, more preferably 70 mm or less, further preferably 65 mm or less, and 30 mm or more and 70 mm or less. It is preferably 35 mm or more and 65 mm or less. The length Lf6 of the ventral portion F is preferably 10 mm or more, more preferably 15 mm or more, more preferably 50 mm or less, further preferably 45 mm or less, and 10 mm or more and 50 mm or less. It is preferably 15 mm or more and 45 mm or less.

The unfolded state shown in FIG. 7 from the viewpoint that the stretching stress of the dorsal stretching region 7R is higher than the stretching stress of the ventral stretching region 7F and the leakage-proof cuff 6 easily adheres along the buttocks in the dorsal stretch region R. In the dorsal side portion R, it is preferable that the length Lr6 of the second end portion fixing portion 6B in the longitudinal direction X is longer than the length Lr5 of the first end portion fixing portion 6A in the longitudinal direction X. The length Lr6 with respect to the length Lr5 is preferably 1.3 times or more, more preferably 1.5 times or more, more preferably 3.0 times or less, and 2.5 times or less. It is more preferably 1.3 times or more and 3.0 times or less, and further preferably 1.5 times or more and 2.5 times or less. The length Lr5 of the dorsal portion R is preferably 30 mm or more, more preferably 35 mm or more, more preferably 70 mm or less, further preferably 65 mm or less, and 30 mm or more and 70 mm or less. It is preferably 35 mm or more and 65 mm or less. The length Lr6 of the dorsal portion R is preferably 35 mm or more, more preferably 40 mm or more, more preferably 120 mm or less, further preferably 110 mm or less, and 35 mm or more and 120 mm or less. It is preferably 40 mm or more and 110 mm or less.

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, a spunbond, a meltblown, and a spunbond laminated non-woven fabric. 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.

It is preferable that the absorbent core 40 of the absorber 4 overlapping the ventral stretchable region 7F in the thickness direction has higher rigidity than the absorbent core 40 of the absorber 4 overlapping the dorsal stretchable region 7R in the thickness direction. With such a configuration, on the ventral side F side, the distance between the pair of leak-

proof cuffs

6 and 6 in the absorbent body 2 can be maintained, and the ventral part F is the body. It becomes easier to fit in. The rigidity of the absorbent core 40 can be adjusted, for example, by changing the basis weight of the absorbent core 40.

From the viewpoint that the ventral side F can be easily fitted to the body, the ventral elastic region 7F is preferably formed of an elastic sheet. The stretchable sheet referred to in the present invention means that the length can be extended to 110 or more when the sheet is pulled in a predetermined direction when the length in the natural state is 100, and when the tensile force is released. A sheet whose length shrinks to 110 or less.
As the elastic sheet used in the present invention, for example, a substantially inelastic inelastic fiber layer is arranged on at least one surface of an elastic fiber layer made of an elastic resin as a raw material, and heat melting is performed while maintaining these fiber morphologies. Laminated non-woven fabrics bonded by dressing, elastic sheets described in JP-A-2008-179128 and JP-A-2007-22066 can be used. As the elastic fiber, a fiber made of a styrene-based elastomer, a polyolefin-based elastomer, a thermoplastic elastomer such as a polyester-based elastomer or a polyurethane-based elastomer, or an elastic resin such as rubber can be used. Further, as the inelastic fiber, a fiber made from the above-mentioned thermoplastic resin can be used.

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. Further, the above-described embodiments may be combined. 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.

In the above-described embodiment, the non-woven fabric 60 is folded in half to form the leak-proof cuff 6, but instead, the non-woven fabric is folded back only at the portion where the leak-proof cuff elastic member 63 is fixed, and other portions. Then, it may be a leak-proof cuff in the form of one piece of non-woven fabric.

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

<1>
It has an absorbent body including a liquid-permeable surface sheet, an absorber and a liquid-impermeable leak-proof sheet, and an exterior body arranged on the non-skin contact surface side of the absorbent body, and when worn, It has a ventral portion located on the ventral side of the wearer, a dorsal portion arranged on the dorsal side, and a crotch portion located between the ventral portion and the dorsal portion, a waist opening and a pair of legs. A pants-type disposable diaper having an opening and having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction.
The exterior body has a widthwise expansion and contraction region in which elastic members are arranged along the width direction on the ventral side and the dorsal side.
The absorbent body is provided with leak-proof cuffs extending along the longitudinal direction on both sides of the longitudinal direction, and the leak-proof cuff has a free end and an other end at one end in the width direction. Has a fixed end and
The leak-proof cuff has a free-end telescopic portion in which a leak-proof cuff elastic member is fixed to the free end portion along the longitudinal direction, and ends fixed to the surface sheet in the vicinity of both ends in the longitudinal direction. Has a fixed part,
The compressive load value in the width direction of the non-woven fabric between the free end telescopic portion and the fixed end portion is 5 cN or less.
The widthwise expansion / contraction region includes a dorsal side fixing portion which is the end portion fixing portion on the dorsal side side, and a dorsal side expansion / contraction region which is a region extending outward from the dorsal side fixing portion in the width direction. It includes a ventral fixing portion which is the end fixing portion on the ventral side, and has a ventral telescopic region which is a region extending outward in the width direction from the ventral fixing portion.
A disposable diaper in which the stretching stress of the dorsal stretching region is higher than the stretching stress of the ventral stretching region.
<2>
The stretch stress of the dorsal stretch region with respect to the stretch stress of the ventral stretch region is 1.04 times or more and 2.0 times or less, preferably 1.05 times or more and 1.8 times or less, according to the above <1>. Disposable diapers.
<3>
The stretch stress of the dorsal stretch region is 0.8 cN / mm or more and 7.0 cN / mm or less, preferably 1.0 cN / mm or more and 6.0 cN / mm or less, according to <1> or <2>. Disposable diapers.
<4>
Any of the above <1> to <3>, wherein the stretching stress of the ventral stretching region is 0.6 cN / mm or more and 5.5 cN / mm or less, preferably 0.8 cN / mm or more and 4.5 cN / mm or less. The disposable diaper described in 1 or 1.
<5>
The exterior body has a ventral low stretch stress region having a lower stretch stress than the ventral stretch region at a portion located on the waist end side of the ventral stretch region, and the dorsal stretch region. The above-mentioned <1> to <4>, wherein the portion located closer to the waist end has a dorsal low elastic stress region having a lower elastic stress than the dorsal elastic region. Disposable diaper.
<6>
The stretch stress of the ventral stretch region with respect to the stretch stress of the ventral low stretch stress region is 1.04 times or more and 2.0 times or less, preferably 1.05 times or more and 1.8 times or less. > The disposable diaper described in.
<7>
The stretch stress of the dorsal stretch region with respect to the stretch stress of the dorsal low stretch stress region is 1.1 times or more and 2.0 times or less, preferably 1.15 times or more and 1.8 times or less. > Or the disposable diaper according to <6>.
<8>
The disposable diaper according to any one of <1> to <7>, wherein the ventral fixing portion has a shorter length along the longitudinal direction than the dorsal fixing portion.
<9>
The length of the dorsal fixing portion in the longitudinal direction with respect to the length of the ventral fixing portion in the longitudinal direction is 1.1 times or more and 2.0 times or less, preferably 1.2 times or more and 1.8 times or less. The disposable diaper according to any one of <1> to <8>.
<10>
The disposable diaper according to any one of <1> to <9>, wherein the length of the ventral fixing portion in the longitudinal direction is 30 mm or more and 65 mm or less, preferably 35 mm or more and 60 mm or less.
<11>
The disposable diaper according to any one of <1> to <10>, wherein the length of the dorsal fixing portion in the longitudinal direction is 40 mm or more and 70 mm or less, preferably 45 mm or more and 65 mm or less.
<12>
The distance from the ventral waist end to the crotch-side end of the ventral-fixed portion is from the dorsal-side waist end to the crotch-side end of the dorsal-fixed portion. The disposable diaper according to any one of <1> to <11>, which is shorter than the distance to the portion.
<13>
From the dorsal waist end to the crotch-side end of the ventral fixation portion with respect to the distance from the ventral waist end to the crotch-side end of the ventral fixation portion. The disposable diaper according to any one of <1> to <12>, wherein the distance to the diaper is 1.05 times or more and 1.5 times or less, preferably 1.1 times or more and 1.4 times or less.
<14>
The distance from the waist end on the ventral side to the end on the crotch side of the ventral fixing portion is 50 mm or more and 105 mm or less, preferably 55 mm or more and 100 mm or less, said <1> to <13>. The disposable diaper according to any one of.
<15>
The distance from the waist end on the dorsal side to the end on the crotch side of the dorsal fixing portion is 60 mm or more and 130 mm or less, preferably 65 mm or more and 120 mm or less. The disposable diaper according to any one of.
<16>
The distance from the waist end on the ventral side to the ventral end of the free end telescopic portion of the leak-proof cuff is from the waist end on the dorsal side to the leak-proof cuff. The disposable diaper according to any one of <1> to <15>, which is shorter than the distance to the end of the free end telescopic portion on the dorsal side.
<17>
The free end of the leak-proof cuff from the waist end on the dorsal side with respect to the distance from the waist end on the ventral side to the ventral end of the free-end telescopic portion of the leak-proof cuff. The distance of the end telescopic portion to the end on the dorsal side is 1.05 times or more and 3.0 times or less, preferably 1.1 times or more and 2.5 times or less. > The disposable diaper according to any one of 1.
<18>
The distance from the waist end on the ventral side to the ventral end of the free end telescopic portion of the leak-proof cuff is 50 mm or more and 120 mm or less, preferably 55 mm or more and 110 mm or less. The disposable diaper according to any one of 1> to <17>.
<19>
The distance from the waist end on the dorsal side to the end on the dorsal side of the free end telescopic portion of the leak-proof cuff is 60 mm or more and 140 mm or less, preferably 65 mm or more and 130 mm or less. The disposable diaper according to any one of 1> to <18>.
<20>
The distance from the dorsal-side waist end to the dorsal-side end of the free-end telescopic portion of the leak-proof cuff is from the dorsal-side waist end to the dorsal-fixed portion. The disposable diaper according to any one of <1> to <19>, which is equal to or less than the distance to the end on the crotch side.
<21>
The dorsal-side waist end to the dorsal-side fixed portion with respect to the distance from the dorsal-side waist end to the dorsal-side end of the free-end telescopic portion of the leak-proof cuff. The distance to the end on the crotch side is 1.0 times or more and 1.4 times or less, preferably 1.05 times or more and 1.3 times or less, any one of <1> to <20>. The listed disposable diapers.
<22>
The distance from the waist end on the ventral side to the ventral end of the free end telescopic portion of the leak-proof cuff is from the waist end on the ventral side to the ventral fixed portion. The disposable diaper according to any one of <1> to <21>, which is equal to or less than the distance to the end on the lower crotch side.
<23>
The ventral side of the waist end to the ventral end of the leak-proof cuff from the ventral waist end to the ventral end of the free end telescopic portion of the leak-proof cuff. The distance to the end on the lower crotch side is 1.0 times or more and 1.7 times or less, preferably 1.05 times or more and 1.5 times or less, any one of <1> to <22>. The listed disposable diapers.
<24>
The distance from the ventral end of the absorbent body to the ventral end of the free end telescopic portion of the leak-proof cuff is the dorsal end of the absorbent body. The disposable diaper according to any one of <1> to <23>, which is shorter than the distance from the portion to the end of the free end telescopic portion of the leak-proof cuff on the dorsal side.
<25>
The dorsal end of the absorbent body with respect to the distance from the ventral end of the absorbent body to the ventral end of the free end telescopic portion of the leakproof cuff. The distance from the leak-proof cuff to the end of the free-end telescopic portion on the dorsal side is 1.1 times or more and 2.0 times or less, preferably 1.2 times or more and 1.8 times or less. , The disposable diaper according to any one of <1> to <24>.
<26>
The distance from the ventral end of the absorbent body to the ventral end of the free end telescopic portion of the leak-proof cuff is 25 mm or more and 70 mm or less, preferably 30 mm or more and 65 mm or less. The disposable diaper according to any one of <1> to <25>.
<27>
The distance from the dorsal end of the absorbent body to the dorsal end of the free end telescopic portion of the leakproof cuff is 30 mm or more and 80 mm or less, preferably 35 mm or more and 70 mm or less. The disposable diaper according to any one of <1> to <26>.
<28>
Of the above <1> to <27>, at least one of the ventral fixing portion and the dorsal fixing portion overlaps the elastic member arranged in the ventral telescopic region or the dorsal telescopic region in the thickness direction. The disposable diaper according to any one.
<29>
The ventral fixing portion overlaps the elastic member arranged in the ventral telescopic region in the thickness direction, and the dorsal fixing portion overlaps the elastic member arranged in the dorsal telescopic region in the thickness direction. The disposable diaper according to any one of <1> to <28>.
<30>
The leak-proof cuff at the lower crotch is wound on the non-skin facing surface side of the absorber and is located inward in the width direction from the side edge along the longitudinal direction of the absorber. The disposable diaper according to any one of 1> to <29>.
<31>
The leak-proof cuff at the lower crotch is joined to the surface sheet wound on the non-skin facing surface side of the absorber at a position inward in the width direction from the side edge along the longitudinal direction of the absorber. The disposable diaper according to any one of <1> to <30>, which has a fixed end portion and the leak-proof cuff and the surface sheet are joined to each other on the non-skin facing surface side of the absorber. ..
<32>
The disposable diaper according to any one of <1> to <31>, wherein the leak-proof cuff and the surface sheet are joined on the non-skin facing surface side of the absorber.
<33>
The portion of the absorber that overlaps the ventral stretchable region in the thickness direction has higher rigidity than the portion of the absorber that overlaps the ventral stretchable region in the thickness direction, any one of <1> to <32>. Disposable diapers listed in.
<34>
The disposable diaper according to any one of <1> to <33>, wherein the non-woven fabric forming the leak-proof cuff has a bulk softness of 10 cN or less, preferably 8 cN or less, and preferably 3 cN or more.
<35>
The non-woven fabric forming the leak-proof cuff has an average deviation (SMD) of surface roughness of 2.2 μm or less, preferably 2.0 μm or less, and preferably 0.5 μm or more. 34> The disposable diaper according to any one of 1.
<36>
The disposable diaper according to any one of <1> to <35>, wherein the leakage-proof cuff has a deformation amount of 1 mm or more, preferably 1.1 mm or more when compressed at 1 kPa.
<37>
The disposable diaper according to any one of <1> to <36>, wherein the ventral stretchable region is formed of a stretchable sheet.
<38>
The leak-proof cuff has a bent portion obtained by folding the leak-proof cuff.
The bent portions are located at intervals inward in the width direction from the side edges along the longitudinal direction of the absorber.
The free end is located outward in the width direction with respect to the bent portion.
The ventral fixing portion and the dorsal fixing portion are the first end fixing portion in which the portion of the leak-proof cuff from the bent portion to the fixed end side is fixed on the surface sheet, and the bent portion, respectively. 4. The method according to any one of <1> to <37>, wherein the portion from the portion to the free end portion side has a second end portion fixing portion indirectly fixed on the surface sheet. Disposable diapers.
<39>
The disposable diaper according to <38>, wherein in the ventral fixing portion, the length of the first end fixing portion in the longitudinal direction is longer than the length of the second end fixing portion in the longitudinal direction.
<40>
In the ventral fixing portion, the length of the first end fixing portion in the longitudinal direction with respect to the length of the second end fixing portion in the longitudinal direction is 1.3 times or more and 3.0 times or less, preferably 3.0 times or less. The disposable diaper according to <38> or <39>, which is 1.5 times or more and 2.5 times or less.
<41>
In the ventral fixing portion, any one of <38> to <40>, wherein the length of the first end fixing portion in the longitudinal direction is 30 mm or more and 70 mm or less, preferably 35 mm or more and 65 mm or less. The listed disposable diapers.
<42>
In the ventral fixing portion, the length of the second end fixing portion in the longitudinal direction is preferably 10 mm or more and 50 mm or less, more preferably 15 mm or more and 45 mm or less, the above <38> to <. 41> The disposable diaper according to any one of 1>.
<43>
In the dorsal fixing portion, any one of <38> to <42>, wherein the length of the second end fixing portion in the longitudinal direction is longer than the length of the first end fixing portion in the longitudinal direction. Disposable diapers listed in.
<44>
The length of the second end fixing portion in the longitudinal direction with respect to the length of the first end fixing portion in the longitudinal direction is 1.3 times or more and 3.0 times or less, preferably 1.5 times or more and 2.5 times. The disposable diaper according to any one of <38> to <43>, which is not more than double.
<45>
The disposable diaper according to any one of <38> to <44>, wherein the length of the first end fixing portion on the ventral side in the longitudinal direction is 30 mm or more and 70 mm or less, preferably 35 mm or more and 65 mm or less. ..
<46>
The disposable diaper according to any one of <38> to <45>, wherein the length of the first end fixing portion in the dorsal portion in the longitudinal direction is 30 mm or more and 70 mm or less, preferably 35 mm or more and 65 mm or less. ..

According to the disposable diaper of the present invention, the leak-proof cuff has a good standing property, leakage can be prevented, and the cuff mark is hard to be left.

Claims

It has an absorbent body including a liquid-permeable surface sheet, an absorber and a liquid-impervious leak-proof sheet, and an exterior body arranged on the non-skin contact surface side of the absorbent body, and when worn, It has a ventral portion located on the ventral side of the wearer, a dorsal portion arranged on the dorsal side, and a crotch portion located between the ventral portion and the dorsal portion, a waist opening and a pair of legs. A pants-type disposable diaper having an opening and having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction.
The exterior body has a widthwise expansion and contraction region in which elastic members are arranged along the width direction on the ventral side and the dorsal side.
The absorbent body is provided with leak-proof cuffs extending along the longitudinal direction on both sides of the longitudinal direction, and the leak-proof cuff has a free end and an other end at one end in the width direction. Has a fixed end and
The leak-proof cuff has a free-end telescopic portion in which a leak-proof cuff elastic member is fixed to the free end portion along the longitudinal direction, and ends fixed to the surface sheet in the vicinity of both ends in the longitudinal direction. Has a fixed part,
The compressive load value in the width direction of the non-woven fabric between the free end telescopic portion and the fixed end portion is 5 cN or less.
The widthwise telescopic region includes a dorsal side fixing portion which is the end portion fixing portion on the dorsal side side, and is a region extending outward from the dorsal side fixing portion in the width direction. It includes a ventral fixing portion which is the end fixing portion on the ventral side, and has a ventral telescopic region which is a region extending outward in the width direction from the ventral fixing portion.
A disposable diaper in which the stretching stress of the dorsal stretching region is higher than the stretching stress of the ventral stretching region.
The disposable diaper according to claim 1, wherein the stretch stress of the dorsal stretch region is 1.04 times or more and 2.0 times or less with respect to the stretch stress of the ventral stretch region.
The disposable diaper according to claim 1 or 2, wherein the stretching stress of the dorsal stretching region is 0.8 cN / mm or more and 7.0 cN / mm or less.
The disposable diaper according to any one of claims 1 to 3, wherein the stretching stress of the ventral stretching region is 0.6 cN / mm or more and 5.5 cN / mm or less.
The exterior body has a ventral low stretch stress region having a lower stretch stress than the ventral stretch region at a portion located on the waist end side of the ventral stretch region, and the dorsal stretch region. The disposable diaper according to any one of claims 1 to 4, which has a dorsal low elastic stress region having a lower elastic stress than the dorsal elastic region in a portion located closer to the waist end side. ..
The disposable diaper according to claim 5, wherein the stretch stress of the ventral stretch region with respect to the stretch stress of the ventral low stretch stress region is 1.04 times or more and 2.0 times or less.
The disposable diaper according to claim 5 or 6, wherein the stretching stress of the dorsal stretching region is 1.1 times or more and 2.0 times or less with respect to the stretching stress of the dorsal low stretching stress region.
The disposable diaper according to any one of claims 1 to 7, wherein the ventral fixing portion has a shorter length along the longitudinal direction than the dorsal fixing portion.
Any one of claims 1 to 8, wherein the length of the dorsal fixing portion in the longitudinal direction is 1.1 times or more and 2.0 times or less with respect to the length of the ventral fixing portion in the longitudinal direction. Disposable diapers listed in.
The disposable diaper according to any one of claims 1 to 9, wherein the length of the ventral fixing portion in the longitudinal direction is 30 mm or more and 65 mm or less.
The disposable diaper according to any one of claims 1 to 10, wherein the length of the dorsal fixing portion in the longitudinal direction is 40 mm or more and 70 mm or less.
The distance from the ventral waist end to the crotch-side end of the ventral-fixed portion is from the dorsal-side waist end to the crotch-side end of the dorsal-fixed portion. The disposable diaper according to any one of claims 1 to 11, which is shorter than the distance to the part.
The crotch-side end of the dorsal fixation from the dorsal-side waist end to the distance from the ventral-side waist end to the crotch-side end of the ventral fixation. The disposable diaper according to any one of claims 1 to 12, wherein the distance to the diaper is 1.05 times or more and 1.5 times or less.
The disposable diaper according to any one of claims 1 to 13, wherein the distance from the waist end on the ventral side to the end on the crotch side of the ventral fixing portion is 50 mm or more and 105 mm or less. ..
The disposable diaper according to any one of claims 1 to 14, wherein the distance from the waist end on the dorsal side to the end on the crotch side of the dorsal fixing portion is 60 mm or more and 130 mm or less. ..
The distance from the waist end on the ventral side to the ventral end of the free end telescopic portion of the leak-proof cuff is from the waist end on the dorsal side to the leak-proof cuff. The disposable diaper according to any one of claims 1 to 15, which is shorter than the distance to the end on the dorsal side of the free end telescopic portion.
The free end of the leak-proof cuff from the waist end on the dorsal side with respect to the distance from the waist end on the ventral side to the ventral end of the free-end telescopic portion of the leak-proof cuff. The disposable diaper according to any one of claims 1 to 16, wherein the distance to the end on the dorsal side of the end telescopic portion is 1.05 times or more and 3.0 times or less.
Any one of claims 1 to 17, wherein the distance from the waist end on the ventral side to the end on the ventral side of the free end telescopic portion of the leak-proof cuff is 50 mm or more and 120 mm or less. Disposable diapers as described in the section.
Any one of claims 1 to 18, wherein the distance from the waist end on the dorsal side to the end on the dorsal side of the free end telescopic portion of the leak-proof cuff is 60 mm or more and 140 mm or less. Disposable diapers as described in the section.
The distance from the dorsal-side waist end to the dorsal-side end of the free-end telescopic portion of the leak-proof cuff is from the dorsal-side waist end to the dorsal-fixed portion. The disposable diaper according to any one of claims 1 to 19, which is equal to or less than the distance to the end on the crotch side.
The dorsal-side waist end to the dorsal-side fixed portion with respect to the distance from the dorsal-side waist end to the dorsal-side end of the free-end telescopic portion of the leak-proof cuff. The disposable diaper according to any one of claims 1 to 20, wherein the distance to the end on the crotch side is 1.0 times or more and 1.4 times or less.
The distance from the waist end on the ventral side to the ventral end of the leak-proof cuff at the free end telescopic portion is the distance from the waist end on the ventral side to the ventral fixation portion. The disposable diaper according to any one of claims 1 to 21, which is equal to or less than the distance to the end on the lower crotch side.
The ventral side of the waist end to the ventral end of the leak-proof cuff with respect to the distance from the ventral waist end to the ventral end of the free end telescopic portion of the leak-proof cuff. The disposable diaper according to any one of claims 1 to 22, wherein the distance to the end on the lower crotch side is 1.0 times or more and 1.7 times or less.
The distance from the ventral end of the absorbent body to the ventral end of the leak-proof cuff at the free end telescopic portion is the dorsal end of the absorbent body. The disposable diaper according to any one of claims 1 to 23, which is shorter than the distance from the portion to the end on the dorsal side of the free end telescopic portion of the leak-proof cuff.
The dorsal end of the absorbent body with respect to the distance from the ventral end of the absorbent body to the ventral end of the leak-proof cuff at the free end telescopic portion. The one according to any one of claims 1 to 24, wherein the distance from the leak-proof cuff to the end on the dorsal side of the free end telescopic portion is 1.1 times or more and 2.0 times or less. Disposable diapers.
Claims 1 to 25, wherein the distance from the ventral end of the absorbent body to the ventral end of the leak-proof cuff at the free end telescopic portion is 25 mm or more and 70 mm or less. The disposable diaper according to any one of the above.
Claims 1 to 26, wherein the distance from the dorsal end of the absorbent body to the dorsal end of the leak-proof cuff at the free end telescopic portion is 30 mm or more and 80 mm or less. The disposable diaper according to any one of the above.
Any one of claims 1 to 27, wherein at least one of the ventral fixing portion and the dorsal fixing portion overlaps the elastic member arranged in the ventral telescopic region or the dorsal telescopic region in the thickness direction. Disposable diapers as described in the section.
The ventral fixing portion overlaps the elastic member arranged in the ventral telescopic region in the thickness direction, and the dorsal fixing portion overlaps the elastic member arranged in the dorsal telescopic region in the thickness direction. The disposable diaper according to any one of claims 1 to 27.
A claim that the leak-proof cuff in the lower crotch is wound on the non-skin facing surface side of the absorber and is located inward in the width direction with respect to the side edge along the longitudinal direction of the absorber. The disposable diaper according to any one of 1 to 29.
The leak-proof cuff at the lower crotch is joined to the surface sheet wound on the non-skin facing surface side of the absorber at a position inward in the width direction from the side edge along the longitudinal direction of the absorber. The disposable diaper according to any one of claims 1 to 30, which has a fixed end portion, and the leak-proof cuff and the surface sheet are joined to each other on the non-skin facing surface side of the absorber.
The disposable diaper according to any one of claims 1 to 31, wherein the leak-proof cuff and the surface sheet are joined on the non-skin facing surface side of the absorber.
The portion of the absorber that overlaps the ventral stretchable region in the thickness direction has higher rigidity than the portion of the absorber that overlaps the ventral stretchable region in the thickness direction, according to any one of claims 1 to 32. Disposable diapers.
The disposable diaper according to any one of claims 1 to 33, wherein the non-woven fabric forming the leak-proof cuff has a bulk softness of 10 cN or less and 3 cN or more.
The disposable diaper according to any one of claims 1 to 34, wherein the non-woven fabric forming the leak-proof cuff has an average deviation (SMD) of surface roughness of 2.2 μm or less and 0.5 μm or more.
The disposable diaper according to any one of claims 1 to 35, wherein the leak-proof cuff has a deformation amount of 1 mm or more when compressed at 1 kPa.
The disposable diaper according to any one of claims 1 to 36, wherein the ventral stretchable region is formed of a stretchable sheet.
The leak-proof cuff has a bent portion obtained by folding the leak-proof cuff.
The bent portions are located at intervals inward in the width direction from the side edges along the longitudinal direction of the absorber.
The free end is located outward in the width direction with respect to the bent portion.
The ventral fixing portion and the dorsal fixing portion are the first end fixing portion in which the portion of the leak-proof cuff from the bent portion to the fixed end side is fixed on the surface sheet, and the bent portion, respectively. The disposable diaper according to any one of claims 1 to 37, wherein the portion from the portion to the free end side has a second end fixing portion indirectly fixed on the surface sheet. ..
The disposable diaper according to claim 38, wherein in the ventral fixing portion, the length of the first end fixing portion in the longitudinal direction is longer than the length of the second end fixing portion in the longitudinal direction.
In the ventral fixing portion, the longitudinal length of the first end fixing portion is 1.3 times or more and 3.0 times or less with respect to the longitudinal length of the second end fixing portion. The disposable diaper according to claim 38 or 39.
The disposable diaper according to any one of claims 38 to 40, wherein in the ventral fixing portion, the length of the first end fixing portion in the longitudinal direction is 30 mm or more and 70 mm or less.
The disposable diaper according to any one of claims 38 to 41, wherein in the ventral fixing portion, the length of the second end fixing portion in the longitudinal direction is 10 mm or more and 50 mm or less.
The method according to any one of claims 38 to 42, wherein in the dorsal fixing portion, the length of the second end fixing portion in the longitudinal direction is longer than the length of the first end fixing portion in the longitudinal direction. Disposable diapers.
Any of claims 38 to 43, wherein the length in the longitudinal direction of the second end fixing portion is 1.3 times or more and 3.0 times or less with respect to the length in the longitudinal direction of the first end fixing portion. The disposable diaper described in item 1.
The disposable diaper according to any one of claims 38 to 44, wherein the length of the first end fixing portion on the ventral side in the longitudinal direction is 30 mm or more and 70 mm or less.
The disposable diaper according to any one of claims 38 to 45, wherein the length of the first end fixing portion in the dorsal portion in the longitudinal direction is 30 mm or more and 70 mm or less.