JP2014100156A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type absorbent article capable of improving flexibility, saving resources, and reducing a manufacturing cost by reducing the number of superposed sheets of a non-joined area with stretchability, and improving fitting property and wearing comfort for a wearer.SOLUTION: The underpants type disposable diaper in which both-side edges of a ventral part and both-side edges of a dorsal part are mutually joined together to form a pair of side seal parts, includes: an outermost-layer sheet 12 forming an outer surface of the diaper and an innermost-layer sheet 15 disposed in a skin surface side of the outermost-layer sheet, between the side edge positions of an absorber in at least the ventral part A and the side seal parts; and a non-joined area R1 where both sheets are not joined. In the non-joined area R1, the outermost-layer sheet 12 is non-stretchable; and the innermost-layer sheet 15 consists of a single sheet, has stretchability in the diaper width direction, and has, in the longitudinal direction Y of the diaper, a plurality of stretchable areas with different extensional stresses in the diaper width direction.

Description

  The present invention relates to a disposable diaper.

Conventionally, in a pants-type disposable diaper, a waistline elastic member disposed on the waistline is fixed to a member other than the outermost layer sheet that forms the outer surface of the diaper, and the member and outermost layer sheet that fix the waistline elastic member A technique is known in which a non-adhesive region is provided between the outermost layer sheets to form a gather on the inner side of the outermost layer sheet, while a gather is not formed on the outer surface of the waistline portion (Patent Document 1).
Further, in Patent Document 2, the outermost layer sheet that forms the outer surface of the diaper and the innermost layer sheet that is disposed on the most skin side of the waistline portion are mostly non-excluding the peripheral portion of the innermost layer sheet. In addition to the adhesion, the use of an elastic sheet for either the outermost layer sheet or the innermost layer sheet is described.
Patent Document 3 describes that an exterior body of a pants-type disposable diaper is composed of two elastic sheets.
Further, in Patent Document 4, the outermost layer sheet and the inner layer sheet disposed on the skin side thereof are coupled to each other by a large number of coupling portions, and both the sheets are formed by a thread-like elastic member disposed in an extended state between both sheets. A disposable diaper formed with a bag is described.

JP 2005-287930 A JP 2010-227153 A JP 2007-260148 A JP 2008-295930 A

In the diaper of Patent Document 1, the waistline elastic member is fixed between two sheets arranged on the inner side of the outermost layer sheet, and one of the two sheets whose hardness is increased by the fixing is the wearer's Since the inner surface that hits the skin is formed, there is room for improvement in terms of the touch that touches the skin.
Patent Documents 2 and 3 also describe that the innermost layer sheet is a stretchable sheet, but there is no suggestion of using the stretchable sheet to enhance the fit.
In the diaper of Patent Document 4, the outer surface and the inner surface of the diaper are both flexible due to the ridges formed on both the outermost layer sheet and the inner layer sheet. Therefore, the idea and configuration are different from those of the present invention.

  The subject of this invention is related with the disposable diaper etc. which can solve the solution subject which said prior art has.

  The present invention is a pants-type disposable in which both side edges of the abdominal side and both side edges of the back side are joined to each other to form a pair of side seals, a waist opening, and a pair of leg openings. An outermost layer sheet that forms an outer surface of a diaper between a position of a side edge of the absorbent body and a side seal part in at least the ventral side portion of the ventral side portion and the back side portion, and the outermost layer. The innermost layer sheet disposed on the skin surface side of the sheet, and has a non-joined region where the two sheets are not joined, and in the non-joined region, the outermost layer sheet is non-stretchable, The innermost layer sheet is composed of a single sheet, has a stretch property in the diaper width direction, and has a plurality of stretch regions having different extension stresses in the diaper width direction in the diaper longitudinal direction. It provides diapers.

  The present invention provides a pant-type diaper in which a pair of side seals, a waist opening, and a pair of leg openings are formed by joining both side edges of the ventral side and both side edges of the back side. An outer sheet that forms an outer surface of the diaper cover at both ends in the width direction of the diaper cover between the pair of side seal portions, at least on the ventral side portion of the ventral side portion and the back side portion, And the innermost layer sheet disposed on the skin surface side of the outer layer sheet, and has a non-joined region where the two sheets are not joined, and the outermost layer sheet is non-stretchable in the non-joined region. The innermost layer sheet is a diaper cover that is composed of a single sheet and has a plurality of stretch regions that have elasticity in the width direction of the diaper cover and that have different extension stresses in the longitudinal direction of the diaper cover. Is to provide

  According to the disposable diaper of the present invention, it is possible to reduce the number of laminated non-bonded region sheets having elasticity, thereby improving flexibility, saving resources, reducing manufacturing costs, etc., and fitability to the wearer And can improve comfort.

  According to the diaper cover of the present invention, it is possible to reduce the number of laminated non-joint region sheets having elasticity, thereby improving flexibility, saving resources, reducing manufacturing costs, and the like, and fit for a wearer. And can improve comfort.

FIG. 1 is a perspective view showing a pants-type disposable diaper according to a first embodiment of the present invention. FIG. 2 is a developed plan view showing the inner surface side in the developed and extended state of the diaper shown in FIG. The expanded and expanded state means that the pants-type absorbent article is in the expanded state, and the expanded absorbent article is stretched with the elastic members of each part, and the design dimensions (in a state in which the influence of the elastic members is completely eliminated) It is the same as when it is expanded to the same size). 3 is a cross-sectional view taken along the line II of FIG. 4 is a cross-sectional view taken along line II-II in FIG. FIG. 5 is an enlarged cross-sectional view of the innermost layer sheet in the first embodiment. 6 (a) and 6 (b) are explanatory diagrams of a preferred method for producing the innermost layer sheet shown in FIG. FIG. 7 is a cross-sectional view showing an example of an aspect of fixing the elastic member to the sheet. FIG. 8 is a cross-sectional view (corresponding to FIG. 4) showing a pants-type disposable diaper according to a third embodiment of the present invention. FIG. 9 is a cross-sectional view (corresponding to FIG. 4) showing a pants-type disposable diaper according to a fourth embodiment of the present invention.

Below, this invention is demonstrated, referring drawings based on the preferable embodiment.
The disposable diaper 1 (hereinafter also referred to as diaper 1) according to the first embodiment of the present invention is a pant in which a waist opening 5 and a pair of leg openings 6 and 6 are formed in advance as shown in FIG. A disposable diaper of the type.
The diaper 1 includes an abdominal side A disposed on the stomach side of the wearer when worn, a back side B disposed on the back side of the wearer when worn, and between the abdominal side A and the back side B. It has a crotch part C which is located and is arranged at a wearer's crotch part at the time of wear.

The diaper 1 includes a pant-type exterior body 11 and an absorbent main body 10 fixed to the exterior body 11.
As for the exterior body 11, the both-sides edge part in the ventral | abdominal side part A and the both-sides edge part in the back | dorsal part B are mutually joined, and a pair of side seal parts S and S and a waist opening part are attached to the diaper by the joining. 5 and a pair of leg openings 6 and 6 are formed. In the unfolded and extended diaper 1, the exterior body 11 has a shape in which a rectangular central portion in the longitudinal direction is constricted as shown in FIG. 2.

  In this specification, the diaper longitudinal direction is a direction from the abdominal side A to the back side B through the crotch C, and is the Y direction in FIG. Moreover, a diaper width direction is a direction which cross | intersects the said longitudinal direction, and is a X direction in FIG. In the unfolded and extended diaper 1, the diaper width direction X is orthogonal to the diaper longitudinal direction Y. The longitudinal direction and the width direction of the absorbent main body are directions corresponding to the longitudinal direction and the width direction of the diaper, respectively. Moreover, in each of the abdominal side A and the back side B, the longitudinal direction of the pant-type absorbent article is the vertical direction when worn, so in the diaper longitudinal direction Y of the abdominal side A and the back side B, The waist opening edge W side is also referred to as the upper side or the upper side, and the crotch C side is also referred to as the lower side or the lower side. The waist opening edge W is the periphery of the waist opening 5.

The exterior body 11 is distribute | arranged to the skin surface side of this outermost layer sheet | seat 12 adjacent to the outermost layer sheet | seat 12 and the outermost layer sheet | seat 12 which forms the outer surface of a diaper, as shown in FIGS. The intermediate sheet 13, the outermost layer sheet 12 or the inner surface forming sheet 14 that is located on the skin surface side of the intermediate sheet 13 and extends over the upper and lower ends of the longitudinal direction of the absorbent main body 10, Each part has elastic members 51, 71, 91, etc. fixed to the sheet.
The outermost layer sheet 12 and the intermediate sheet 13 are continuous over the abdominal side part A, the crotch part C, and the back side part B, respectively, and the inner surface forming sheet 14 is provided on the back side part B and the abdominal side part A, respectively. One piece is arranged. Moreover, the outermost layer sheet 12 forms the outer surface of the diaper 1 in the entire region of the abdominal side A, the crotch C, and the back side B, and the sheet material constituting the outermost layer sheet 12 is a waist. Folded portions 12a and 12b of the outermost layer sheet 12 are formed by folding back to the skin surface side at the opening edge W. The inner surface forming sheet 14 is an innermost layer sheet 15 in which a portion of the outermost layer sheet 12 that is not covered by the folded portions 12a and 12b forms an inner surface in contact with the skin of the wearer. A skin surface is a surface which is turned to the wearer's skin side at the time of wearing among both surfaces of each sheet.

  Hereinafter, the lamination | stacking state of the sheet | seat in the exterior body 11 of the diaper 1 is further demonstrated. In the diaper 1 of the present embodiment, the exterior body 11 has the same laminated structure in the abdominal side A and the back side B. Therefore, the laminated structure of the abdominal side A will be mainly described with reference to FIGS. 3 and 4, but the same description is applied to the back side B.

As shown in FIGS. 3 and 4, the outer package 11 of the diaper 1 of the first embodiment includes an outermost layer sheet 12 that forms an outer surface of the diaper in the waist region A2 of the ventral side A, and the outermost layer sheet. 12 and the innermost layer sheet 15 disposed on the skin surface side, and has a non-joined region R1 where the sheets 12 and 15 are not joined.
The non-joining region R <b> 1 in the present embodiment has a two-layer structure including one outermost layer sheet 12 and one innermost layer sheet 15. The end of the intermediate sheet 13 in the longitudinal direction Y of the diaper substantially coincides with the position of the end of the absorbent main body 10 or the absorbent body 4 in the longitudinal direction.

The non-joining area | region R1 in the diaper 1 of this embodiment is formed in G and G between the position of the side edge of the absorber 4 in the ventral side part A, and the side seal part S, and right and left of the absorber 4 It is also formed at a position D between both side edges, and the non-joining region R1 is formed over substantially the entire region between the pair of side seal portions S, S in the ventral side portion A. The position of the side edge of the absorbent body 4 is the position of the side edge (position in the diaper width direction X) of the portion where the width of the absorbent body is maximum in each of the ventral side portion A and the back side portion B.
The outermost layer sheet 12 and the inner surface forming sheet 14 extend to the vicinity of the peripheral edge W of the waist opening beyond the position of the upper end of the non-joining region R1, and the outermost layer sheet 12 in the vicinity of the peripheral edge W of the waist opening. A plurality of waist elastic members 51 (five in the illustrated example) are arranged in a stretched state across the entire width in the width direction of the ventral side A to form a waist elastic region A1. Has been. The waist elastic region A1 forms a waist gather at the peripheral edge portion of the waist opening 5 due to the contraction, and the fit in the waist opening is improved.

  The waistline region A2 is a portion located on the crotch part C side with respect to the waist elastic region A1. The waist elastic region A <b> 1 is a stretchable region formed at the peripheral edge of the waist opening 5. When the boundary between the waist elastic region A1 and the waistline region A2 is unknown, the region on the crotch C side from the position where the distance from the waist opening edge W to the crotch C direction is 3 cm is defined as the waistline region A1.

  Moreover, the outermost layer sheet 12 and the inner surface forming sheet 14 extend to the crotch C side beyond the position of the lower end of the non-joining region R1. A portion below the non-bonding region R1 in the outermost layer sheet 12 is fixed to the intermediate sheet 13 with an adhesive. As shown in FIGS. 3 and 4, the inner surface forming sheet 14 is fixed below the non-bonding region R <b> 1 to the skin facing surface at the end portion in the longitudinal direction of the absorbent main body 10 or the vicinity of the upper end 13 u of the intermediate sheet 13. The lower fixing portion 14b is provided.

The outermost layer sheet 12 in the present embodiment is non-stretchable over the entire area.
Here, the non-stretchability of the sheet means that the following applies when measured by the following method. (1) When the sheet is stretched in the diaper width direction X, it breaks at an elongation of 100% or less. (2) The elongation recovery rate (elongation recovery rate at 100% elongation) when the sheet is stretched in the diaper width direction X to 100% elongation and then contracted is 30% or less.
<Measurement method of non-stretchability>
A sample piece of a sheet having a length of 50 mm and a width of 25 mm is prepared, and the sample piece is fixed at a chuck interval L0 using a Tensilon tensile tester ["RTC-1210A" manufactured by Orientec Co., Ltd.] The piece is stretched in the length direction at a speed of 300 mm / min to a length Lb at the time of 100% elongation (length of elongation 100%, Lb = L0 × 2). If the sample does not break, the length of the sample piece when the stress becomes zero after starting to return at the same speed as the tensile speed is defined as the length La after the elongation recovery. The elongation recovery rate at 100% elongation is calculated from the following equation.
Elongation recovery rate at 100% elongation (%) = [(Lb−La) / (Lb−L0)] × 100
The sample piece has a length direction (50 mm) in a direction corresponding to the width direction X of the diaper or the diaper cover.

As described above, since the entire outermost layer sheet 12 is non-stretchable, the outermost layer sheet 12 in the non-joining region R1 naturally has non-stretchability. On the other hand, the innermost layer sheet 15 in the non-bonded region R1 is composed of a composite stretchable sheet 15A shown in FIG.
The composite elastic sheet 15A is composed of a single sheet and has elasticity in the diaper width direction X. Here, being composed of a single sheet means not including a plurality of sheets stacked in the thickness direction Z.
The composite stretchable sheet 15A shown in FIG. 5 will be described in more detail.
As shown in FIG. 5, the composite stretchable sheet 15 </ b> A includes a single nonwoven fabric 60 and a plurality of elastic members 71 that are intermittently fixed on the nonwoven fabric 60 in the diaper longitudinal direction Y. The elastic member 71 is arranged along the diaper width direction X. The elastic member 71 is stretched and fixed to the nonwoven fabric 60, and the nonwoven fabric is also contracted by the contraction force of the elastic member 71. As the non-woven fabric 60, various known non-woven fabrics can be used. For example, a single-layer or multi-layer structure spunbond non-woven fabric, spunlace non-woven fabric composed of hydrophobic fibers such as polyethylene fibers, polyester fibers, and polypropylene fibers, An air-through nonwoven fabric and the like can be preferably used, and those having a basis weight of 10 g / m ² or more are preferred, and those having a basis weight of 20 g / m ² or less are preferred. As the spunbond nonwoven fabric, a spunbond / melblown / spunbond (SMS) nonwoven fabric composed of polypropylene fibers can also be used.

  Note that the nonwoven fabric 60 of the intermediate sheet 13 and the composite stretchable sheet 15A is also preferably a non-stretchable sheet in a single state where the elastic member is not fixed.

As the adhesive 63, what is normally used for absorbent articles, such as a disposable diaper, can be used without a restriction | limiting in particular, For example, a hot-melt-type adhesive agent can be used.
The adhesive 63 is preferably applied directly to each elastic member 71 using a bead gun or the like as an adhesive application machine. Furthermore, from the viewpoint of easy formation of the ridges 64 protruding from the base portion 65, it is preferable to apply the coating directly only on the position of each elastic member 71 facing the nonwoven fabric 60. For example, as shown in FIG. 5, the adhesive 63 is directly applied only on a substantially half circumference facing the nonwoven fabric 60 in the ridge 64 in the entire circumference of the elastic member 71 as viewed in cross section. Is preferred. Further, each flange 64 is formed by contraction of each elastic member 71, and as shown in FIG. 5, each elastic member 71 is arranged near the front end of each flange 64 in the height direction. Yes. The elastic member 71 is separated from the nonwoven fabric 60 located at the base portion 65 between the elastic members 71 and 71 adjacent to each other in the longitudinal direction Y of the diaper, and the spacing L6 between them improves the cushioning property in the thickness direction Z. From the viewpoint of improving the air permeability and the air permeability, it is preferably 0.1 mm or more, and more preferably 0.5 mm or more. And it is preferable that it is 10 mm or less, and it is still more preferable that it is 50 mm or less. Moreover, it is preferable that it is 0.1-10 mm, and it is still more preferable that it is 0.5-5.0 mm.

An example of a method for producing such a composite stretchable sheet 15A will be described with reference to FIGS. 6 (a) and 6 (b).
First, the belt-shaped original fabric sheet 60A is conveyed in the longitudinal direction, and as shown in FIG. 6 (a), a convex roller provided with a grooved roller 66 having a groove 66a extending in the circumferential direction and a ridge 67a extending in the circumferential direction. It introduces between the strip rollers 67 to form a groove-like recess 64 ′ in the original fabric sheet 60 </ b> A. Next, as shown in FIG. 6 (b), while maintaining the groove-like concave portion 64 ′ of the original sheet 60A in the groove of the grooved roller 66 or in the groove of another roller transferred from the roller, The elastic member 71 is allowed to enter the recessed portion 64 ′ in a state where it is stretched and tension is applied. Before the elastic member 71 enters the recess 64 ′, an adhesive is applied to the elastic member 71 or the recess 64 ′, and the elastic member 71 is coupled to the vicinity of the bottom of the recess 64 ′.
In this way, the composite stretchable sheet 15A ′ formed on the peripheral surface of the grooved roller 66 is peeled off from the peripheral surface of the grooved roller 66 and cut into an appropriate length by a known cutting means. The composite elastic sheet 15A is obtained. In FIGS. 6A and 6B, CD is a direction orthogonal to the conveying direction of the original fabric sheet 60A or the composite stretchable sheet 15A ′.

  The innermost layer sheet 15 in the non-bonded region R1 is composed of the composite stretchable sheet 15A shown in FIG. 5, and has a stretchable portion R2 in which a plurality of elastic members 71 are fixed in an expanded state, thereby being stretchable in the diaper width direction X. have.

The innermost layer sheet 15 in the non-bonded region R1 of the diaper 1 of the present embodiment has a plurality of stretchable regions R21 to R23 having different stretching stresses in the diaper width direction X in the diaper longitudinal direction Y as shown in FIG. ing.
More specifically, the plurality of elastic members 71 of the composite stretchable sheet 15A are made of the same material and thickness, but have different stretch rates when they are fixed to the raw fabric sheet 60A of the nonwoven fabric 60. It is. More specifically, in FIG. 5, the elongation rate when fixing the uppermost elastic member 71 close to the upper end Ru of the non-joining region R1 is the highest, and the third lower elastic member 71 from the upper end Ru is fixed. The extension rate at the time is the next highest, and the extension rate at the time of fixing the second central elastic member 71 from the upper end Ru is the lowest. As a result, the stretchable stress in the upper stretchable region R21 closest to the waist opening to which the uppermost elastic member 71 is fixed is the highest, and the lower stretchable to the nearest crotch C to which the lower elastic member 71 is fixed. The extension stress in the region R23 is the next highest, and the extension stress in the central stretch region R22 to which the central elastic member 71 is fixed is the lowest.
That is, there is a relationship of elongation stress in the upper stretch region R21> extension stress in the lower stretch region R23> extension stress in the central stretch region R22.

The elongation stress in the diaper width direction X is measured as follows.
[Measurement method of elongation stress]
The upper stretchable region R21, the central stretchable region R22, and the lower stretchable region R23 are cut out from the diaper in a ring-like state in which the abdomen side portion and the back side portion are connected, and this is used as a sample. This sample was placed on a horizontal surface so that the outer surface of the portion on the dorsal side was in contact with the horizontal surface, and the sample was naturally contracted between both ends (left and right side seals). The length between S) is measured to obtain the natural length. The natural length is measured along a center line that bisects between the upper and lower edges of the sample. Then, the sample is slackened and fixed between chucks of a Tensilon tensile tester [Orientec Co., Ltd., “RTC-1210A”], and the load at that time is set to zero. Thereafter, the load is stretched at a speed of 300 mm / min in the same direction as the diaper width direction until the load becomes 10 N, and then the movement direction of the chuck is reversed and contracted until the load becomes zero at the same speed. Then, the sample length when extended to a load of 10 N is taken as the length at the time of strong extension, and in the contraction (return) process, the intermediate length between the length at the time of strong extension and the natural length [(length at the time of strong extension − The stress at the time when the natural length) / 2] is taken as the elongation stress.
In addition, it may replace with the method of changing the elongation rate at the time of fixing an elastic member to a nonwoven fabric etc., and you may vary extension stress by changing the forming material, thickness, or cross-sectional area of an elastic member.

  The stretchable portion R2 of the innermost layer sheet 15 preferably has a ratio of the extension stress between the region R21 having the maximum extension stress in the diaper width direction X and the region R22 having the minimum extension stress in the diaper width direction X, preferably 1.5. More preferably, it is 3.0 or more. And it is preferably 10 or less, more preferably 7.0 or less. Moreover, Preferably it is 1.5-10, More preferably, it is 3.0-7.0.

A plurality of elastic members 71 are arranged in the diaper longitudinal direction Y in the innermost layer sheet 15 in the non-joined region R1, and the length L2 of the stretchable part R2 in the diaper longitudinal direction (see FIGS. 3 and 4). It is preferable to make it wide from the viewpoint of allowing the surrounding area A2 to gently fit on the wearer's waist.
The ratio of the length L2 of the stretchable part R2 in the longitudinal direction Y of the diaper to the length La of the same direction Y of the ventral part A is preferably 10% or more, more preferably 50% or more. The upper limit is 100%. In the case of the pants-type disposable diaper of the present embodiment, the length La in the longitudinal direction of the abdominal side A is the same as the length of the side seal portion S in the diaper longitudinal direction.
In the case of an adult diaper, the length L2 of the stretchable part R2 is preferably 2 cm or more, more preferably 10 cm or more. And it is preferably 25 cm or less, more preferably 20 cm or less. Moreover, Preferably it is 2-25 cm, More preferably, it is 10-20 cm.
The length of the stretchable part R2 in the diaper width direction is preferably 30% or more, more preferably 40% or more, and still more preferably 50% or more, with respect to the length W1 between the side seal parts of the ventral side A. It is. The upper limit is 100%.

Moreover, it is preferable that length L1 of the diaper longitudinal direction Y is non-joining area | region R1 more than the said length L2 of the expansion-contraction part R2 mentioned above at least.
The length L1 of the non-joining region R1 in the longitudinal direction Y of the diaper is preferably 10% or more, more preferably 50% or more, with respect to the length La of the same direction Y of the ventral side A. The upper limit is 100%.
In the case of an adult diaper, the length L1 of the non-joining region R1 is preferably 2 cm or more, more preferably 10 cm or more. And it is preferably 25 cm or less, more preferably 20 cm or less. Moreover, Preferably it is 2-25 cm, More preferably, it is 10-20 cm.
Further, the length of the non-joining region R1 in the diaper width direction is preferably 30% or more, more preferably 40% or more, and still more preferably 50% of the length W1 between the side seal portions of the ventral side A. That's it. The upper limit is 100%.

Moreover, the non-joining area | region R1 provided with the expansion-contraction part R2 should just be formed in the site | parts G and G outside the side edge of the absorber 4 at least in the diaper width direction of the abdominal side part A. The non-joining region R1 of the side portion A preferably extends over substantially the entire width between the pair of side seal portions on the abdominal side portion, and the non-joining region R1 of the back side portion B is also a pair of the back side portion. It is preferable to extend over substantially the entire width between the side seal portions. When the non-joining region R1 extends over substantially the entire width between the pair of side seal portions, the flexibility / fit property is improved over the entire skin contact side.
In addition, over substantially the entire width between the pair of side seal portions means that the length of the non-joining region R1 in the diaper width direction X is 65% or more of the total width W1 between the pair of side seal portions. To do. The length of the non-joining region R1 in the diaper width direction X is more preferably 90% or more of the total width W1 between the pair of side seal portions, and even more preferably 100%.

  In addition, as shown in FIG. 7, the waist elastic member 51 in this embodiment is joined between the outermost layer sheet 12 and the inner surface forming sheet 14 only through the adhesive applied to the elastic member 51. Between the adjacent waist elastic members 51, a non-joined region where the outermost layer sheet 12 and the inner surface forming sheet 14 are not joined is formed. Moreover, it is preferable that a plurality of waist elastic members 51 are arranged at intervals in the diaper longitudinal direction Y. The number of waist elastic members 51 disposed on the ventral side A and the back side B is preferably 3 or more, more preferably 4 or more, respectively. And it is preferably 15 or less, more preferably 12 or less. Moreover, Preferably it is 3-15, More preferably, it is 4-12.

A plurality of lower elastic members 91 extending in the diaper width direction X are arranged at intervals in the diaper longitudinal direction Y in the inseam region A3 of the ventral side portion A of the diaper 1 of the present embodiment. As shown in FIG. 4, the lower elastic member 91 is joined between the outermost layer sheet 12 and the intermediate sheet 13 via an adhesive. The lower elastic member 91 develops a stretching force on the outer side of both side edges of the absorbent main body 10, while a non-stretchable region in which the lower elastic member 91 does not develop a stretching force in the central portion in the X direction overlapping the absorbent main body 10. It is preferable to have. In the non-stretchable region, the lower elastic member 91 may not be arranged, or the lower elastic member 91 may be arranged in a state where the elastic property is not exhibited.
A leg elastic member 61 is further disposed on the exterior body 11. The leg elastic member 61 is disposed between the outermost layer sheet 12 and the intermediate sheet 13 in an extended state, and forms leg gathers that contract along the legs around the leg openings 6 and 6 of the diaper 1. To do. The intermediate sheet 13 has a role of fixing the leg elastic member 61. The lower elastic member 91 and the leg elastic member 61 are bonded to each other between two adjacent sheets via an adhesive applied to one or both sheets, and between the elastic member and the elastic member. The sheets are also joined at the center position.

  As shown in FIGS. 2 and 3, the absorbent main body 10 has a rectangular shape that is long in the same direction as the longitudinal direction Y of the diaper, and is a liquid-permeable top sheet 2, liquid-impermeable or liquid-impermeable (water-repellent). Etc.) and the liquid retaining absorbent 4 interposed between the two sheets 2 and 3. The absorbent body 4 includes an absorbent core made of an aggregate of fibers such as pulp fibers, or an absorbent core 40 in which particles of a water-absorbing polymer are held, and a core wrap sheet 46 that covers the absorbent core 40. Become. The absorbent core 40 is preferably a fluff pulp fiber product or a mixed product of fluff pulp and a water-absorbing polymer. Various known materials can be used as the core wrap sheet 46, and for example, a thin paper such as tissue paper or a water-permeable nonwoven fabric is preferably used. Further, as shown in FIG. 2, the absorbent main body 10 has side cuffs 8, 8 made of a liquid-resistant or water-repellent and breathable material on the left and right sides in the longitudinal direction of the absorbent main body 10. You may have. In the vicinity of the free end of each side cuff 8, a plurality of side cuff elastic members 81 are arranged in an expanded state. The side cuff 8 stands up when wearing a diaper and prevents the liquid from flowing out to the side.

The diaper 1 of 1st Embodiment can be used similarly to the conventional underpants type disposable diaper.
According to the diaper 1 of 1st Embodiment, since the outermost layer sheet | seat 12 is not joined to the elastic sheet | seat distribute | arranged to the inner side in the non-joining area | region R1, the outer surface of the diaper which consists of the outermost layer sheet | seat 12 is soft. And feels good. Moreover, in the non-joining region R1, the innermost layer sheet 15 is also composed of a single sheet, although it has elasticity, compared with a structure in which an elastic member is fixed to two or more sheets. The synthesis is low and flexible. Therefore, it fits gently against the skin of the wearer on the inner surface side of the diaper, has a good touch, and provides excellent comfort.

Moreover, since the innermost layer sheet 15 has a plurality of stretchable regions having different stretching stresses in the diaper width direction, the stretchability can be appropriately designed according to the circumference of the waist and the uneven shape of the wearer, The fit with respect to a wearer's body shape can also be improved.
In particular, in the plurality of stretch regions R21 to R23 in which the stretch stress of the innermost layer sheet is different, the stretch stress of the stretch region R21 near the waist opening 5 is greater than the stretch stress of the stretch region R23 near the crotch C side. Therefore, appropriate stress is applied in accordance with the uneven shape of the abdomen and buttocks to prevent deviation. Therefore, the fit with respect to the wearer is further improved.

  In addition, the non-bonded region R1 can have a two-layer structure, etc., the number of sheets can be reduced, the resource saving and the burden of material management can be reduced, and the manufacturing cost of the disposable diaper can be suppressed.

  Moreover, in 1st Embodiment, since the expansion-contraction part R2 of the innermost layer sheet | seat 15 shows cushioning properties in the thickness direction Z, the comfortable feeling improves more.

The formation material of each part of the diaper 1 mentioned above is demonstrated.
As the top sheet 2, the back sheet 3, the absorbent body 4, the side cuff 8 forming sheet, and the like, various kinds of materials conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. For example, as the surface sheet 2, a single layer or multilayer nonwoven fabric, an apertured film, or the like can be used. As the back sheet 3, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. The back sheet 3 may or may not have moisture permeability.

  In addition, as the outermost layer sheet 12, the intermediate sheet 13, and the inner surface forming sheet 14, various sheet materials conventionally used for absorbent articles such as disposable diapers can be used without particular limitation, but a nonwoven fabric can be used. Preferably, the nonwoven fabric is a single-layer nonwoven fabric such as an air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, or melt blown nonwoven fabric, or a laminated nonwoven fabric in which the same or different types of nonwoven fabrics are laminated in two or more layers. Further, as the outermost layer sheet 12 and the intermediate sheet 13, a sheet in which a nonwoven fabric and a film are integrated can be used.

Each of the outermost layer sheet 12 and the intermediate sheet 13 is preferably a spunbond nonwoven fabric, particularly a spunbond nonwoven fabric having a basis weight of 20 g / m ² or less. By using a spunbonded nonwoven fabric having excellent tensile strength, the basis weight of each sheet can be reduced, and the fit and mounting feeling can be improved by reducing the rigidity of the sheet.

  Examples of the material for forming the elastic members 51, 61, 71, 81, 91 include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As a form of the elastic member, a cross-sectionally rectangular, square, circular, elliptical or polygonal thread shape (thread rubber or the like), a string shape (flat rubber etc.), or a multifilament type thread shape or the like It can be preferably used.

  Next, the disposable diaper of the 2nd-4th embodiment of this invention is demonstrated. About the diaper of 2nd-4th embodiment, the point different from the diaper 1 of 1st Embodiment is mainly demonstrated, and description is abbreviate | omitted about the same point. For points that are not particularly described, the description in the first embodiment, including a preferred configuration, is applied as appropriate. Moreover, the same code | symbol is attached | subjected to the element similar to 1st Embodiment.

  The disposable diaper of 2nd Embodiment differs in the expansion | extension rate at the time of fixing the elastic member 71 distribute | arranged to the non-joining area | region R1 from 1st Embodiment. More specifically, in FIG. 5, the elongation rate when fixing the uppermost elastic member 71 in the non-joining region R1 is the highest, and the elongation rate when fixing the second elastic member 71 from the upper end Ru is the next. The elongation rate when fixing the third elastic member 71 is the lowest. Thereby, the extensional stress of the upper elastic region R21 is the highest, the extensional stress of the central elastic region R22 to which the central elastic member 71 is fixed is the next highest, and the lower elastic region to which the lower elastic member 71 is fixed. The elongation stress of R23 is the lowest. That is, there is a relationship of elongation stress in the upper stretch region R21> extension stress in the central stretch region R22> extension stress in the lower stretch region R23.

As described above, the plurality of stretch regions R21 to R23 having different extension stresses in the innermost layer sheet 15 in the non-joint region R1 are directed from the stretch region R23 on the side close to the crotch to the stretch region R21 on the side close to the waist opening. The elongation stress is strong.
According to 2nd Embodiment, this can exhibit higher fitting property with respect to the unevenness | corrugation of an abdominal part.

  In the embodiment, the elongation stress of the stretch region near the waist opening 5 is increased from the stretch region R23 near the crotch to the stretch region R21 near the waist opening. In addition, it is not limited to the form in which the extensional stress increases in order from the crotch C side toward the waist opening 5 side. For example, as shown in FIG. The stretch stress of the stretchable region R24 including the two elastic members is stronger than the stretch stress of the stretchable region R25 including the one elastic member on the crotch side, or one elasticity close to the waist opening 5 For example, the extension stress of the stretch region R26 including the member is stronger than the stretch stress of the stretch region R27 including the two elastic members on the crotch side.

The disposable diaper of 3rd Embodiment is extended to the position where the folding | turning parts 12a and 12b of the outermost layer sheet 12 overlap with the edge part of the absorptive main body 10, as shown in FIG. The folded portions 12a and 12b of the outermost layer sheet 12 are formed by folding the sheet material constituting the outermost layer sheet 12 to the skin surface side at the waist opening edge W. And the sheet material is the nonwoven fabric 60 which forms the expansion-contraction part R2 of the same structure as the expansion-contraction part R2 of 1st Embodiment.
According to the disposable diaper of 3rd Embodiment, the effect similar to 1st Embodiment is show | played.

In the disposable diaper of 4th Embodiment, as shown in FIG. 9, the inner surface formation sheet 14 consists only of one sheet | seat which has a stretching property, and the innermost layer sheet | seat 15 of the non-joining area | region R1 is the one sheet | seat. It consists only of sheets.
Also in the diaper of the fourth embodiment, the outermost layer sheet 12 forming the outer surface of the diaper in each of the waistline region A2 of the abdominal side A and the waistline region B2 of the back side, and the skin surface side of the outermost layer sheet It has the non-joining area | region R1 where the innermost layer sheet | seat 15 distribute | arranged to is not joined. And the non-joining area | region R1 in 4th Embodiment becomes the expansion-contraction part R2 as a whole.

As an elastic sheet made of a single sheet used as the inner surface forming sheet 14 of the fourth embodiment, (1) a set of elastic fibers described in paragraphs [0022] to [0028] of JP-A-2008-228760 A sheet in which an extensible fiber assembly is integrated on both sides of an elastic fiber sheet made of a body, and (2) an extensible fiber assembly is integrated in a natural state on at least one side of a net-like elastic sheet. (3) an elastic non-woven sheet consisting only of an aggregate of elastic fibers, (4) a large number of elastic filaments arranged so as to extend in one direction without crossing each other, in a substantially non-stretched state, A stretchable sheet or the like bonded to a stretchable nonwoven fabric over the entire length is preferably used.
The stretchable sheet used as the intermediate sheet 13 of the fourth embodiment is preferably a stretchable sheet having stretchability even if a plurality of elastic members in the form of threads or strips are not fixed in a stretched state, and substantially in a natural state. Sheets without wrinkles are preferred.

As the inner surface forming sheet 14 in the fourth embodiment, a large number of elastic filaments arranged so as to extend in one direction without crossing each other are bonded to the stretchable nonwoven fabric over their entire length in a substantially non-stretched state. A stretchable sheet is preferably used.
Details of such stretchable sheets are described in Japanese Patent Application Laid-Open Nos. 2008-179128 and 2009-150003. In addition, as described in Japanese Patent Application Laid-Open No. 2008-179128, for example, these elastic sheets are manufactured as a composite in which an elastic filament is sandwiched between two non-woven fabrics, It is obtained by introducing elasticity between a pair of tooth space rolls that are combined so that the teeth are loosely inserted between the teeth of the other tooth space roll, and by applying a partial stretching treatment. By varying the degree of stretching in this stretching process, the innermost layer sheet 15 in the fourth embodiment has a diaper width direction X in the diaper longitudinal direction Y of the non-joining region R1 and the stretchable part R2 in the diaper longitudinal direction Y. A region R29 where the tensile stress in the diaper width direction is weaker than the region R28 is formed in the region R28 where the tensile stress is strong and on the crotch part side.
According to the fourth embodiment, the same effect as that of the first embodiment is achieved. Moreover, since the innermost layer sheet 15 in the fourth embodiment is composed of one stretchable sheet, the surface is smooth and the skin feel is good, and the feeling of wear is further improved.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.

  For example, in the diaper of each of the above embodiments, the non-joining region R1 having the stretchable part R2 is formed on both the back side part B and the ventral side part A, but such a stretchable part R2 is provided. The non-joining area | region R1 may be formed only in any one of the ventral | abdominal part A and the back | dorsal part B. Moreover, the non-joining area | region R1 which has the expansion-contraction part R2 may be formed only in the area | region G outside the side edge of the absorber 4 in each of the abdominal part A and the back part B.

  Further, the stretchable portion R2 of the non-joined region R1 is divided into two regions in the longitudinal direction of the diaper, and the region on the waist opening side of the region may be a region having a higher elongation stress than the region on the crotch side, On the contrary, the region on the crotch part side may be a region having a stronger elongation stress than the region on the waist opening side. In this case, the boundary between the two regions may be a central position that bisects the length of the diaper in the longitudinal direction Y, or may be above the central position or below the central position. In addition, the stretchable part R2 of the non-joining region R1 may be divided into three regions in the longitudinal direction of the diaper, and two regions on the waist opening side may be regions where the elongation stress is stronger than one region on the crotch side. On the contrary, the two areas on the crotch part side may be areas where the extension stress is stronger than the one area on the waist opening side. Alternatively, the stretchable portion R2 of the non-joined region R1 may be divided into three or more regions in the longitudinal direction of the diaper so that the elongation stress increases in this order from the crotch side toward the waist opening. Further, the elongation stress may be continuously increased steplessly from the crotch side toward the waist opening side.

Further, the exterior body is replaced with the outermost layer sheet 12 and the intermediate sheet 13 which are continuous over the abdominal side part A, the crotch part C and the back side part B, respectively. In part B, the outermost layer sheet 12 and / or the intermediate sheet 13 which are separate from each other may be arranged.
Further, the disposable diaper may be a pants-type disposable diaper for infants or adults, and an unfolded disposable diaper having fastening tapes on both the left and right sides of the back side portion.

  Moreover, as embodiment of the diaper cover of this invention, what removed the absorptive main body from each of the 1st-4th embodiment of the disposable diaper of this invention can be illustrated. The description of the diaper of the first to fourth embodiments described above is an explanation of the embodiment of the diaper cover by replacing the longitudinal direction of the diaper with the longitudinal direction of the diaper cover and the diaper width direction with the width direction of the diaper cover. . The diaper cover is worn in the same manner as a disposable diaper by placing an auxiliary absorbent device provided with an absorbent body called a urine collecting pad or the like on the inner surface side facing the wearer's skin. As an auxiliary | assistant absorber, what has the structure similar to the absorptive main body of the disposable diaper mentioned above can be used, for example.

  The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

This invention discloses the following underpants type disposable diaper or a diaper cover further regarding embodiment mentioned above.
<1> A pants-type disposable diaper in which a pair of side seal portions, a waist opening portion, and a pair of leg openings are formed by joining both side edge portions of the ventral side portion and both side edge portions of the back side portion. Because
The outermost layer sheet forming the outer surface of the diaper between the position of the side edge of the absorbent body and the side seal part in at least the ventral side portion of the ventral side portion and the back side portion, and the skin surface side of the outermost layer sheet And the innermost layer sheet arranged in, and has a non-joined region where the two sheets are not joined,
In the non-bonding region, the outermost layer sheet is non-stretchable, the innermost layer sheet is composed of one sheet, has stretchability in the diaper width direction, and extends in the diaper longitudinal direction in the diaper width direction. A pants-type disposable diaper having a plurality of stretchable regions with different stresses.
<2> A pant-type diaper cover in which a pair of side seals, a waist opening, and a pair of leg openings are formed by joining both side edges of the ventral side and both side edges of the back side Because
An outer layer sheet that forms the outer surface of the diaper cover at both ends in the width direction of the diaper cover between the pair of side seal portions at least on the ventral side portion of the ventral side portion and the back side portion, and the skin of the outer layer sheet It has an innermost layer sheet arranged on the surface side, and has a non-joining region where the two sheets are not joined,
In the non-bonding region, the outermost layer sheet is non-stretchable, the innermost layer sheet is composed of a single sheet, is stretchable in the width direction of the diaper cover, and is elongated in the longitudinal direction of the diaper cover. A diaper cover that has a plurality of different stretchable areas.
<3> The pants-type disposable diaper or diaper cover according to <1> or <2>, wherein the non-joining region has a two-layer structure including one outermost layer sheet and one innermost layer sheet.
<4> The plurality of stretchable regions having different extension stresses of the innermost layer sheet have a strong stretch stress from the stretchable region near the crotch portion toward the stretchable region near the waist opening, <1> A pants-type disposable diaper or a diaper cover according to any one of to <3>.
<5> The innermost layer sheet in the non-bonded region includes an upper stretchable region (R21) near the waist opening and a lower stretchable region (R23) near the crotch as a plurality of stretchable regions having different extension stresses. And a central expansion / contraction region (R22) located between the two regions, and the extension stress of the upper extension / contraction region (R21) is stronger than the extension stress of the lower extension / contraction region (R23). The pants-type disposable diaper or diaper cover according to any one of <1> to <3>, wherein the extension stress in the region (R23) is stronger than the extension stress in the central stretch region (R22).
<6> The stretchable portion of the innermost layer sheet has a ratio of the elongation stress between the region having the largest elongation stress in the width direction and the region having the smallest elongation stress in the width direction being 1.5 or more, preferably 3. The pants-type disposable diaper or diaper cover according to any one of <1> to <5>, which is 0 or more.
<7> The expansion / contraction part of the innermost layer sheet has a ratio of the elongation stress between the region having the largest elongation stress in the width direction and the region having the smallest elongation stress in the width direction of 10 or less, preferably 7.0 or less. The pants-type disposable diaper or diaper cover according to any one of <1> to <6>.
<8> The pants-type disposable diaper according to any one of <1> to <7>, wherein the non-joining region is formed over substantially the entire width between the pair of side seal portions in the ventral side portion. Diaper cover.
<9> The non-joining region is formed over 65% or more, preferably 90% or more, more preferably 100% of the total width between the pair of side seal portions in the ventral side, <1> to <6> The pants-type disposable diaper or diaper cover described in any one of the above.
<10> The innermost layer sheet in the non-bonding region is a non-woven fabric in which a large number of elastic filaments arranged so as to extend in one direction without crossing each other are substantially non-stretched and can be stretched over their entire length. Any one of <1> to <8>, which is a stretchable sheet obtained by expressing elasticity by introducing a composite bonded to a pair of tooth space rolls and performing a partial stretching treatment A pants-type disposable diaper or diaper cover according to 1.
<11> The elastic sheet is
A composite in which an elastic filament is sandwiched between two non-woven fabrics is manufactured, and this is combined with a pair of tooth spaces so that the teeth of one tooth space roll are loosely inserted between the teeth of the other tooth space roll <10> The pants-type disposable diaper or diaper cover according to <10>, which is obtained by introducing elasticity between rolls and applying a partial stretching treatment.
<12> By varying the degree of stretching in the stretching treatment, the innermost layer sheet has a region having a strong elongation stress in the width direction on the side of the waist opening in the longitudinal direction of the non-joint region and the stretchable portion, The underpants type disposable diaper or diaper cover as described in <11> which formed the area | region where the extensional stress of the width direction was weak compared with the said area | region on the side.
<13> The innermost layer sheet is (1) a sheet in which stretchable fiber aggregates are integrated on both sides of an elastic fiber sheet composed of elastic fiber aggregates, and (2) at least a net-like elastic sheet. Any one of <1> to <8> selected from a sheet in which stretchable fiber aggregates are integrated in a natural state on one side, and (3) an elastic non-woven sheet composed only of elastic fiber aggregates. The described pants-type disposable diaper or diaper cover.
<14> The innermost layer sheet in the non-bonded region includes one nonwoven fabric and a plurality of elastic members fixed to the nonwoven fabric in an elongated state intermittently in the longitudinal direction of the diaper. The underpants-type disposable diaper or diaper cover according to any one of <1> to <8>, which is an elastic sheet fixed in a bag formed on the nonwoven fabric.
<15> The pants-type disposable diaper or diaper cover according to <14>, wherein the innermost layer sheet is formed by folding the outermost layer sheet.
<16> The spacing between the elastic member and the nonwoven fabric positioned at the base between the elastic members adjacent in the longitudinal direction is 0.1 mm or more, preferably 0.5 mm or more <14> or <15 > Pants-type disposable diapers or diaper covers as described.
<17> Any one of <13> to <16>, wherein the spacing between the elastic member and the nonwoven fabric located at the base between the elastic members adjacent in the longitudinal direction is 10 mm or less, preferably 50 mm or less. A pants-type disposable diaper or diaper cover according to 1.
<18> The elastic sheet is
A belt-shaped raw fabric sheet is introduced between a grooved roller having a groove extending in the circumferential direction and having a groove extending in the circumferential direction and a convex roller having a convex strip extending in the circumferential direction to form a groove shape in the raw fabric sheet. Forming a recess,
Applying an adhesive in the elastic member or the recess,
While maintaining the groove-shaped recess of the original sheet in the groove of the grooved roller or in the groove of another roller transferred from the roller, the elastic member is extended and tension is applied in the recess. The pants-type disposable diaper or diaper cover according to any one of <13> to <17>, which is an expandable sheet obtained by being inserted in a state.
<19> The outermost layer sheet extends to the vicinity of the peripheral edge of the waist opening beyond the position of the upper end of the non-joining region, and a plurality of the outermost layer sheets are provided in the vicinity of the peripheral edge of the waist opening. The pants-type disposable diaper or diaper cover according to any one of <1> to <18>, in which a waist elastic member is arranged.
<20> The length in the longitudinal direction of the stretchable part of the innermost layer sheet is a ratio of the length in the same direction of the ventral side part of 10% or more, preferably 50% or more. The underpants type disposable diaper or diaper cover of any one.
<21> The length in the longitudinal direction of the stretchable part of the innermost layer sheet is described in any one of <1> to <20>, in which a ratio to the length in the same direction of the ventral part is 100% or less. Pants-type disposable diaper or diaper cover.
<22> The pants-type disposable diaper or diaper cover according to any one of <1> to <21>, wherein the length in the longitudinal direction of the stretchable portion of the innermost layer sheet is 2 cm or more, preferably 10 cm or more.
<23> The pants-type disposable diaper or diaper cover according to any one of <1> to <22>, wherein the length in the longitudinal direction of the stretchable part of the innermost layer sheet is 25 cm or less, preferably 20 cm or less.
<24> The length in the width direction of the stretchable part of the innermost layer sheet is 30% or more, preferably 40% or more, more preferably 50% or more, with respect to the length between the side seal parts of the ventral part. The pants-type disposable diaper or diaper cover described in any one of <1> to <23>.
<25> The length in the width direction of the stretchable portion of the innermost layer sheet is any one of <1> to <24>, in which a ratio to the length between the side seal portions of the ventral side portion is 100% or less. The described pants-type disposable diaper or diaper cover.
<26> The length in the longitudinal direction of the non-bonded region is any one of <1> to <25>, wherein the ratio of the length in the same direction of the ventral part is 10% or more, preferably 50% or more. The pants-type disposable diaper or diaper cover described in 1.
<27> The pants-type disposable according to any one of <1> to <26>, wherein the length of the non-bonded region in the longitudinal direction is 100% or less of the length in the same direction of the ventral side. Diapers or diaper covers.
<28> The pants-type disposable diaper or diaper cover according to any one of <1> to <27>, wherein the length in the longitudinal direction of the non-bonded region is 2 cm or more, preferably 10 cm or more.
<29> The pants-type disposable diaper or diaper cover according to any one of <1> to <28>, wherein the length in the longitudinal direction of the non-bonded region is 25 cm or less, preferably 20 cm or less.
<30> The length in the width direction of the non-joining region is such that the ratio of the length between the side seal portions on the ventral side is 30% or more, preferably 40% or more, more preferably 50% or more <1. The pants-type disposable diaper or diaper cover described in any one of> to <29>.
<31> The pants according to any one of <1> to <30>, wherein the length in the width direction of the non-joining region is 100% or less in proportion to the length between the side seal portions on the abdominal side. Type disposable diaper or diaper cover.
<32> The disposable diaper according to any one of <1> to <31>, having an absorber.

A Abdominal side A1 Waist elastic region A2 Girth region 10 Absorbent body 2 Top sheet 3 Back sheet 4 Absorber 40 Absorbent core 46 Core wrap sheet 5 Waist opening 6 Leg opening 11 Exterior body 12 Outermost layer sheet 12a, 12b Folded portion of outermost layer sheet 13 Intermediate sheet 14 Inner surface forming sheet 15 Innermost layer sheet 15A Composite stretchable sheet R1 Non-bonding region R2 Stretchable portion of innermost layer sheet

Claims (8)

A pants-type disposable diaper in which the side edges of the abdominal side and the side edges of the back side are joined together to form a pair of side seals, a waist opening, and a pair of leg openings. ,
The outermost layer sheet forming the outer surface of the diaper between the position of the side edge of the absorbent body and the side seal part in at least the ventral side portion of the ventral side portion and the back side portion, and the skin surface side of the outermost layer sheet And the innermost layer sheet arranged in, and has a non-joined region where the two sheets are not joined,
In the non-bonding region, the outermost layer sheet is non-stretchable, the innermost layer sheet is composed of one sheet, has stretchability in the diaper width direction, and extends in the diaper longitudinal direction in the diaper width direction. A pants-type disposable diaper having a plurality of stretchable regions with different stresses.   The pants-type disposable diaper according to claim 1, wherein the non-joining region has a two-layer structure including one outermost layer sheet and one innermost layer sheet.   The plurality of stretchable regions having different extension stresses of the innermost layer sheet, the stretch stress increases from the stretchable region near the crotch portion toward the stretchable region near the waist opening. Pants-type disposable diapers. The innermost layer sheet in the non-bonded region includes an upper stretchable region (R21) near the waist opening and a lower stretchable region (R23) near the crotch, as a plurality of stretchable regions having different extension stresses. A central stretchable region (R22) located between the two regions;
The extension stress in the upper stretch region (R21) is stronger than the extension stress in the lower stretch region (R23), and the stretch stress in the lower stretch region (R23) is stronger than the stretch stress in the central stretch region (R22). The underpants type disposable diaper of Claim 1 or 2.   The underpants type disposable diaper of any one of Claims 1-4 in which the said non-joining area | region is formed over the substantially full width between a pair of side seal parts in the said stomach side part.   The innermost layer sheet in the non-bonded region is bonded to a stretchable nonwoven fabric over the entire length of a large number of elastic filaments arranged so as to extend in one direction without crossing each other. The pants according to any one of claims 1 to 5, which is an elastic sheet obtained by introducing elasticity between the pair of tooth space rolls and applying a partial stretching treatment. Type disposable diaper.   The innermost layer sheet in the non-bonded region is composed of one nonwoven fabric and a plurality of elastic members fixed to the nonwoven fabric in an intermittently extending state in the longitudinal direction of the diaper. The underpants type disposable diaper of any one of Claims 1-5 which is an expansion-contraction sheet | seat currently fixed in the bag formed in. A pants-type diaper cover in which both side edges of the ventral side and both side edges of the back side are joined to each other to form a pair of side seals, a waist opening, and a pair of leg openings. ,
An outer layer sheet that forms an outer surface of the diaper cover at both end portions in the width direction of the diaper cover between the pair of side seal portions in at least the ventral side portion of the ventral side portion and the back side portion, and the skin surface of the outer layer sheet It has an innermost layer sheet arranged on the side, and has a non-joined area where the two sheets are not joined,
In the non-bonding region, the outermost layer sheet is non-stretchable, the innermost layer sheet is composed of a single sheet, is stretchable in the width direction of the diaper cover, and is elongated in the longitudinal direction of the diaper cover. A diaper cover that has a plurality of different stretchable areas.

Images