JP6080292B2 - Disposable diapers - Google Patents

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.
Further, in Patent Document 3, the outermost layer sheet forming the outer surface of the diaper and the inner layer sheet disposed on the skin side thereof are coupled to each other at a number of coupling portions, and are disposed in an extended state between the two sheets. A disposable diaper is described in which ridges are formed on both sheets by a thread-like elastic member.

JP 2005-287930 A JP 2010-227153 A JP 2008-161514 A

Since the gathers of the diaper of patent document 1 are not formed in the outer surface of a waist part, it exhibits a clean external appearance. However, there is a risk that the skin is rubbed by the gathers formed inside the outermost layer sheet.
In the diaper of Patent Document 2, when the innermost layer sheet is an elastic sheet, there is a risk that the elastic sheet may rub the skin, and even when the outermost layer sheet is an elastic sheet, Movement and accompanying expansion and contraction of the outermost layer sheet are easily transmitted to the innermost layer sheet, and the skin may be rubbed.
In the diaper of Patent Document 3, 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. However, both sheets have a large number of connecting portions that connect them. Therefore, the idea and configuration are different from those of the present invention.

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

  Disclosed is a disposable diaper having an abdominal side portion disposed on the wearer's ventral side, a dorsal side portion disposed on the wearer's back side, and a crotch portion positioned between the abdominal side portion and the back side portion. The outermost layer sheet that forms the outer surface of the diaper, the innermost layer sheet that forms the inner surface in contact with the wearer's skin, and the outermost layer in at least the ventral region of the ventral part and the dorsal part. The intermediate sheet located between the outer layer sheet and the innermost layer sheet has a multilayer region that overlaps in the thickness direction, and the intermediate sheet is fixed to the outermost layer sheet and the innermost layer sheet in the multilayer region. The present invention provides a disposable diaper having a non-fixed region that is not provided and having elasticity in the diaper width direction.

  The present invention relates to a diaper cover having an abdominal side portion disposed on the abdomen side of the wearer, a back side portion disposed on the back side of the wearer, and a crotch portion positioned between the abdomen side portion and the back side portion. The outermost layer sheet that forms the outer surface of the diaper cover, the innermost layer sheet that forms the inner surface in contact with the skin of the wearer, in the waist region of at least the abdominal part of the ventral part and the back part, and The intermediate sheet located between the outermost layer sheet and the innermost layer sheet has a multilayer region that overlaps in the thickness direction, and the intermediate sheet is in the multilayer region in both the outermost layer sheet and the innermost layer sheet. The present invention provides a diaper cover that has a non-fixed region that is not fixed, and that is stretchable in the width direction of the diaper cover.

According to the disposable diaper of the present invention, the wearability of the wearer's skin is excellent, and the movement of the outer surface of the diaper and the movement of the stretchable intermediate sheet are not easily transmitted to the sheet in contact with the skin. Good comfort is obtained without rubbing.
According to the diaper cover of the present invention, the wearer's skin is excellent in fit, and the movement of the outer surface and the movement of the stretchable intermediate sheet are not easily transmitted to the sheet in contact with the skin, and the skin is rubbed. Good comfort can be obtained.

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 a cross-sectional view schematically showing a cross section of the waist region of the belly side and the back side of the diaper of FIG. FIG. 6 is a cross-sectional view showing an example of an aspect of fixing the elastic member to the sheet. FIG. 7 is a cross-sectional view (corresponding to FIG. 3) showing a pants-type disposable diaper according to a second embodiment of the present invention. FIG. 8A is a cross-sectional view (corresponding to FIG. 3) showing a pants-type disposable diaper according to a third embodiment of the present invention, and FIG. 8B is an expansion / contraction of the intermediate sheet of the diaper shown in FIG. It is an expanded sectional view of a part. FIG. 9 is a cross-sectional view (corresponding to FIG. 3) showing a pants-type disposable diaper according to a fourth embodiment of the present invention. FIG. 10: is sectional drawing (FIG. 3 equivalent view) which shows the underpants type disposable diaper of 5th Embodiment of this invention. FIG. 11: is sectional drawing (FIG. 4 equivalent view) which shows the underpants type disposable diaper of 5th Embodiment of this 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 inner surface forming sheet 14 which 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, and each part disposed between the sheets It has elastic members 71, 91 and the like.
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.

The outer package 11 of the diaper 1 of the first embodiment has an outermost layer sheet 12 that forms the outer surface of the diaper in the waist region A2 of the abdominal side A, and an innermost layer that forms the inner surface of the diaper in contact with the wearer's skin. The intermediate sheet 13 located between the sheet 15 and the outermost layer sheet 12 and the innermost layer sheet 15 has a multilayer region R that overlaps in the thickness direction.
The upper end of the multilayer region R coincides with the position of the upper end 13 u of the intermediate sheet 13, and the lower end of the multilayer region R coincides with the position of the lower end 15 d of the innermost layer sheet 15.
The inner surface forming sheet 14 extends beyond the position of the upper end of the multilayer region R to the vicinity of the peripheral edge W of the waist opening. And between the outermost layer sheet 12 and the inner surface forming sheet 14 in the vicinity of the peripheral edge W of the waist opening, a plurality (five in the illustrated example) of waist elastic members 51 are arranged in the width direction of the ventral side A. A waist elastic region A1 is formed by being stretched over the entire width. 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.

  Further, as shown in FIG. 3, the intermediate sheet 13 has a non-fixed region R <b> 1 that is not fixed to either the outermost layer sheet 12 or the innermost layer sheet 15 in the multilayer region R. As shown in FIG. 3, the intermediate sheet 13 in the first embodiment has a stretchable portion R <b> 2 composed of two stacked sheets 13 g and 13 i and a thread-like or string-like elastic member 71 fixed therebetween. Yes. The non-fixed region R1 of the intermediate sheet 13 has stretchability in the diaper width direction X by having the stretchable portion R2.

  The number of elastic members 71 arranged in the non-fixed region R1 of the intermediate sheet 13 is preferably 2 or more, more preferably 3 or more, and preferably 30 or less, more preferably 20 or less, Moreover, Preferably it is 2-30, More preferably, it is 2-20.

In the non-fixed region R1 of the intermediate sheet 13, a plurality of elastic members 71 are arranged dispersed in the diaper longitudinal direction Y and the length L2 of the stretchable part R2 in the diaper longitudinal direction is widened. However, it is preferable from the viewpoint of gently fitting the wearer around the waist. The length L2 of the stretchable part R2 in the diaper longitudinal direction is a distance between the elastic member 71 present at the uppermost end in the longitudinal direction and the elastic member 71 present at the lowermost end in the non-fixed region R1.
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 preferably 25 cm or less, more preferably 20 cm or less, Is 2 to 25 cm, more preferably 10 to 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%.

In addition, the non-fixed region R1 of the intermediate sheet 13 preferably has a length L1 in the diaper longitudinal direction Y that is at least equal to or greater than the length L2 of the stretchable portion R2.
The length L1 of the non-fixed 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 in 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-fixed region R1 is preferably 2 cm or more, more preferably 10 cm or more, and preferably 25 cm or less, more preferably 20 cm or less. Preferably it is 2-25 cm, More preferably, it is 10-20 cm.

  The length of the non-fixed region R1 in the diaper width direction is preferably 30% or more, more preferably 40% or more, and still more preferably 50%, with respect to the length W1 between the side seal portions of the ventral side A. That's it. The upper limit is 100%.

  It is preferable that the non-fixed region R1 including the stretchable portion R2 is formed at least at the outer portions G and G from the side edge of the absorber 4 in the diaper width direction. In the diaper 1 of the present embodiment, the non-fixed region R1 of the ventral side A spans the entire width between the pair of side seal portions on the ventral side, and the non-fixed region R1 of the back side B also similarly It extends over the entire width between the pair of side seals on the back side. That is, as shown in FIG. 5, the non-fixed region R1 of the ventral side A and the non-fixed region R1 of the dorsal side B are connected to the waist region A2 of the ventral side and the waist region B2 of the back side in a ring shape. It is formed over substantially the entire circumference excluding the vicinity of S and S of the side seal part in the annular waistline region. Similarly, the stretchable portion R2 of the non-fixed region R1 is formed over substantially the entire circumference excluding the vicinity of the side seal portion in the annular waistline region. When the non-fixed region R1 and its stretchable portion R2 are formed over substantially the entire circumference excluding the vicinity of the side seal portion, the fit is further improved and the skin is gentler. In addition, in the figure, the code | symbol H shows a wearer.

The upper end of the intermediate sheet 13 in the diaper 1 of the first embodiment is joined to the outermost layer sheet 12 via an adhesive 17. The upper end side of the intermediate sheet 13 may not be fixed to other members, but the intermediate sheet 13 is bent inside when fixed to other members such as the outermost layer sheet 12 and the inner surface forming sheet. It is preferable from the point which prevents.
On the other hand, the portion of the intermediate sheet 13 located below the non-fixed region R1 is fixed to the outermost layer sheet 12 and the absorbent main body 10 via an adhesive in the portion overlapping the absorbent main body 10, and absorbs the part. In the part located outside the both side edges of the sex main body 10, it is fixed to the outermost layer sheet 12 and the inner surface forming sheet 14 via an adhesive.

  As shown in FIG. 6, the elastic member 71 is joined to the two sheets 13g and 13i constituting the intermediate sheet 13 only through the adhesive 16 applied to the elastic member 71, and is adjacent to the sheet 13g. A non-bonded region M in which the two sheets 13g and 13i are not bonded to each other is formed between the elastic members 71 to be performed. Thereby, softness and breathability are improved.

  Also, the waist elastic member 51 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, similarly to the elastic member 71 described above. Between the waist elastic members 51 to be performed, a non-joined region is formed in which the outermost layer sheet 12 and the inner surface forming sheet 14 are not joined. 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 arranged on the ventral side A and the back side B is preferably 3 or more, more preferably 4 or more, and preferably 15 or less, more preferably 12 each. The number is preferably 3 to 15, and more preferably 4 to 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 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 non-fixing area | region R1 which has the elasticity of the intermediate sheet 13 is not being fixed to either the outermost layer sheet 12 or the innermost layer sheet 15, the intermediate sheet is the outermost layer. Stretchability similar to that of the intermediate sheet alone is expressed without being affected by the sheet and the innermost layer sheet, and the drop in stretchability that occurs when the sheet is joined to these sheets does not occur. Therefore, favorable fitting property is obtained with respect to the wearer's skin.
Moreover, even if the outer surface of the diaper moves due to the movement of the wearer and the intermediate sheet expands or contracts due to the movement of the wearer during wearing, the movement is not easily transmitted to the innermost layer sheet 15. Therefore, it is excellent in elasticity, and it is difficult for the skin to be rubbed by the innermost layer sheet 15, so that excellent comfort can be obtained.

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.

  Also, as the two sheets 13g and 13i constituting the outermost layer sheet 12, the intermediate sheet 13, and the innermost layer sheet 15, various sheet materials conventionally used for absorbent articles such as disposable diapers are used without particular limitation. However, it is preferable to use a non-woven fabric, and as the non-woven fabric, a single-layer non-woven fabric such as an air-through non-woven fabric, a heat roll non-woven fabric, a spunlace non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, or the like A laminated nonwoven fabric laminated on the substrate is preferred. Further, as the outermost layer sheet 12, the intermediate sheet 13, and the innermost layer sheet 15, a sheet in which a nonwoven fabric and a film are integrated can be used.

The two sheets 13g and 13i and the innermost layer sheet 15 constituting the outermost layer sheet 12 and the intermediate sheet 13 are each 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.

The outermost layer sheet 12 and the innermost layer sheet 15 are preferably non-stretchable sheets. The two sheets 13g and 13i constituting the intermediate sheet 13 are also preferably non-stretchable sheets in a single state where the elastic member is not fixed.
“Non-stretchable sheet” refers to a sheet that falls into any of the following 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). When not ruptured, the length of the sample piece when the stress becomes 0 after starting to return at the same speed as the tensile speed is defined as the length La after 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.

  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 2nd-5th embodiment of this invention is demonstrated. About the diaper of 2nd-5th 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 is applied as appropriate, including the preferred configuration. Moreover, the same code | symbol is attached | subjected to the element similar to 1st Embodiment.

As shown in FIG. 7, the disposable diaper according to the second embodiment includes two sheets 13 g and 13 i formed by folding a single sheet in the non-fixed region R <b> 1 having the stretchable part R <b> 2 in the intermediate sheet 13 and the sheet. The point which consists of the thread-like or string-like elastic member 71 arrange | positioned in the expansion | extension state between them, and the point from which the upper end of this intermediate sheet 13 is not being fixed to another member differ from 1st Embodiment. Similarly to the first embodiment, the intermediate sheet 13 of the second embodiment has both end portions in the diaper width direction fixed to the pair of side seal portions S, S.
According to the disposable diaper of 2nd Embodiment, the effect similar to 1st Embodiment is show | played.

As shown in FIGS. 8A and 8B, the disposable diaper according to the third embodiment includes a non-fixed region R1 having a stretchable portion R2 in the intermediate sheet 13, and the non-woven fabric 60. 60 and a plurality of elastic members 71 fixed intermittently in the longitudinal direction Y of the diaper. The elastic member 71 is arranged in an extended state in the diaper width direction X and is fixed to the nonwoven fabric 60 with an adhesive 63. The nonwoven fabric 60 is a spunbond nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric or the like of a single layer or a multilayer structure composed of hydrophobic fibers such as polyethylene fibers, polyester fibers, and polypropylene fibers. A nonwoven fabric in the range of 20 g / m ² is preferred. The spunbond nonwoven fabric is preferably a spunbond / melblown / spunbond (SMS) nonwoven fabric composed of polypropylene fibers.

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. 8B, the adhesive 63 is directly applied only on a substantially half circumference facing the non-woven fabric 60 in the ridge 64 on the entire circumference of the elastic member 71 as viewed in cross section. It is preferable. Further, each flange 64 is formed by contraction of each elastic member 71, and as shown in FIG. 8B, each elastic member 71 is closer to the height direction tip of each flange 64 as shown in cross section. It is arranged. 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 air permeability, it is preferably 0.1 mm or more, more preferably 0.5 mm or more, preferably 10 mm or less, more preferably 5.0 mm or less, and preferably 0.1 mm or less. -10 mm, more preferably 0.5-5.0 mm.

  According to the disposable diaper of 3rd Embodiment, the effect similar to 1st Embodiment is show | played. Moreover, according to the disposable diaper of 3rd Embodiment, since the expansion-contraction part R2 in the non-fixing area | region R1 of the intermediate | middle sheet | seat 13 shows cushioning properties in the thickness direction Z, a feeling of wearing improves further.

In the disposable diaper of 4th Embodiment, as shown in FIG. 9, the folding | returning parts 12a and 12b of the outermost layer sheet 12 are extended to the position which overlaps with the edge part of the absorptive main body 10, The folding | returning part 12a , 12b constitute the innermost layer sheet 15 in the multilayer region R. 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.
According to the disposable diaper of 4th Embodiment, the effect similar to 1st Embodiment is show | played.

In the disposable diaper of 5th Embodiment, as shown in FIG.10 and FIG.11, the intermediate sheet 13 consists of only one sheet | seat which has a stretching property.
Also in the diaper of the fifth 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 inside of the diaper in contact with the wearer's skin A multilayer region R is formed in which the innermost layer sheet 15 forming the surface and the intermediate sheet 13 positioned between the outermost layer sheet 12 and the innermost layer sheet 15 overlap in the thickness direction. And the intermediate sheet 13 consists of one sheet | seat which has a stretching property. As shown in FIGS. 10 and 11, the intermediate sheet 13 has a non-fixed region R1 that is not fixed to either the outermost layer sheet 12 or the innermost layer sheet 15 in the multilayer region R. The entire fixed region R1 is an expandable portion R2.

As an elastic sheet composed of one sheet used as the intermediate sheet 13 of the fifth embodiment, (1) an aggregate of elastic fibers described in paragraphs [0022] to [0028] of JP-A-2008-228760 (2) A stretchable fiber assembly is integrated in a natural state on at least one surface 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, An elastic 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 fifth embodiment is preferably a stretchable sheet having stretchability even when 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.
The term “extendable” means that the maximum elongation in at least one direction is 100% or more (the length is extended twice or more).

  According to the disposable diaper of 5th Embodiment, the effect similar to 1st Embodiment is show | played. Moreover, according to the disposable diaper of 5th Embodiment, it is thin, and it is softer and it is excellent in the comfort.

  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 embodiments described above, the back side portion B and the abdominal side portion A have a laminated region R in which the outermost layer sheet, the intermediate sheet, and the innermost layer sheet overlap, And the non-fixed region R1 and the stretchable part R2 of the intermediate sheet 13 were formed in each of the stacked region R of the ventral side A, but such a stacked region R, non-fixed region R1 and stretchable part R2 are It may be formed only on either the ventral side A or the back side B.
Moreover, the structure of the lamination | stacking area | region R, the non-fixing area | region R1, and the expansion-contraction part R2 may be the same in the ventral | abdominal part A and the back part B, or may differ. For example, the configuration of the ventral side A in the first embodiment and the configuration of the dorsal side B in the other embodiments may be combined, the configuration of the ventral side A in the second embodiment, and other implementations The configuration of the back side portion B in the form may be combined, the configuration of the ventral side portion A in the third embodiment may be combined with the configuration of the back side portion B in the other embodiments, or the fourth The configuration of the ventral portion A in the embodiment and the configuration of the dorsal portion B in the other embodiments may be combined, the configuration of the ventral portion A in the fifth embodiment, and the dorsal side in other embodiments The configuration of part B may be combined.

Further, the end of the intermediate sheet on the side of the waist opening edge W may be fixed to another sheet such as the innermost layer sheet or the inner surface forming sheet instead of the outermost layer sheet, or the outermost layer sheet and the innermost layer. It may be fixed to both the sheet and the inner surface forming sheet. Also, the elastic member forming the elastic member of the waist elastic member or the intermediate sheet is fixed between the two sheets via a so-called solid adhesive on one or both of the two sheets sandwiching them. May be.
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-5th embodiment of the disposable diaper of this invention can be illustrated. The description of the diaper of the first to fifth embodiments described above is an explanation of the embodiment of the diaper cover when the longitudinal direction of the diaper is read as the longitudinal direction of the diaper cover and the diaper width direction is replaced 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 disposable diapers or diaper covers further regarding embodiment mentioned above.
<1> A disposable diaper having an abdominal side portion arranged on the wearer's ventral side, a dorsal side portion arranged on the wearer's back side, and a crotch portion positioned between the abdominal side portion and the dorsal side portion A diaper cover,
The outermost layer sheet that forms the outer surface of the diaper or the diaper cover, the innermost layer sheet that forms the inner surface in contact with the wearer's skin, and the outermost layer in the waist region of at least the ventral side of the ventral side and the back side The intermediate sheet located between the sheet and the innermost layer sheet has a multilayer region that overlaps in the thickness direction,
The intermediate sheet has a non-fixed region that is not fixed to either the outermost layer sheet or the innermost layer sheet in the multilayer region, and the non-fixed region has elasticity in the width direction of the diaper or the diaper cover. Disposable diapers or diaper covers.

<2> The disposable diaper or diaper cover according to <1>, wherein the outermost layer sheet is non-stretchable.
<3> The disposable diaper or diaper cover according to <1> or <2>, wherein the innermost layer sheet is non-stretchable.
<4> The disposable diaper or the diaper cover according to any one of <1> to <3>, wherein the non-fixed region includes a plurality of laminated sheets and an elastic member arranged in an extended state between the sheets. .
<5> The disposable diaper or diaper cover according to <4>, wherein the plurality of sheets are two sheets formed by folding back one sheet.
<6> The one sheet includes one nonwoven fabric and a plurality of elastic members intermittently fixed on the one nonwoven fabric in the longitudinal direction of the diaper or the diaper cover. The disposable diaper or diaper cover of any one of 3>.
<7> The elastic member 71 is separated from the nonwoven fabric 60 positioned in the base portion 65 between the elastic members 71 and 71 adjacent to each other in the longitudinal direction Y of the diaper or the diaper cover, and the distance L6 between them is The disposable diaper or diaper cover according to <6>, which is 0.1 mm or more, preferably 0.5 mm or more.
<8> The elastic member 71 is separated from the non-woven fabric 60 positioned in the base portion 65 between the elastic members 71 and 71 adjacent to each other in the longitudinal direction Y of the diaper or the diaper cover, and the spacing L6 is separated. The disposable diaper or diaper cover according to <6> or <7>, which is 10 mm or less, preferably 5.0 mm or less.
<9> The disposable diaper or the diaper cover according to any one of <4> to <8>, wherein the number of the elastic members 71 arranged in the non-fixed region R1 is two or more, preferably three or more. .

<10> The disposable diaper or the diaper cover according to any one of <4> to <9>, wherein the number of the elastic members 71 arranged in the non-fixed region R1 is 30 or less, preferably 20 or less.
<11> The length L2 in the longitudinal direction of the stretchable portion R2 of the stretchable portion R2 having stretchability in the width direction of the diaper or the diaper cover in the non-fixed region has a ratio of 10 to the length La in the longitudinal direction of the ventral side portion. % Of the disposable diaper or diaper cover according to any one of <1> to <10>, which is at least%, preferably at least 50%.
<12> The length L2 in the longitudinal direction of the diaper of the stretchable part R2 having stretchability in the width direction of the diaper or the diaper cover in the non-fixed region is 100 to the length La in the longitudinal direction of the ventral side part. % Of the disposable diaper or diaper cover according to any one of <1> to <11>.
<13> The length L2 of the diaper longitudinal direction of the stretchable part R2 having stretchability in the width direction of the diaper or the diaper cover in the non-fixed region is 2 cm or more, preferably 10 cm or more, <1> to <12 > The disposable diaper or diaper cover of any one of>.
<14> The length L2 of the diaper longitudinal direction of the elastic part R2 having elasticity in the width direction of the diaper or the diaper cover in the non-fixed region is 25 cm or less, preferably 20 cm or less, <1> to <13 > The disposable diaper or diaper cover of any one of>.
<15> The length in the width direction of the stretchable portion R2 having stretchability in the width direction of the diaper or the diaper cover in the non-fixed region is 30% or more of the length relative to the length between the side seal portions on the ventral side. The disposable diaper or diaper cover according to any one of <4> to <14>, preferably 40 or more, more preferably 50% or more.
<16> In the non-fixed region, the length in the width direction of the stretchable portion R2 having stretchability in the width direction of the diaper or the diaper cover is 100% or less in proportion to the length between the side seal portions on the ventral side portion. The disposable diaper or diaper cover according to any one of <1> to <15>.
<17> The elastic member is bonded to the two sheets 13g and 13i constituting the intermediate sheet 13 through only the adhesive applied to the elastic member, and any one of <4> to <16> The disposable diaper or diaper cover as described in 1.
<18> The length in the longitudinal direction of the non-fixed region is any one of <4> to <17>, which is longer than the length in the longitudinal direction of the stretchable part R2 having stretchability in the width direction of the diaper or the diaper cover. The disposable diaper or diaper cover described.
<19> The disposable diaper or the diaper cover according to any one of <1> to <3>, wherein the intermediate sheet includes only one sheet having elasticity.

<20> One sheet having the stretchability is (1) a sheet in which stretchable fiber aggregates are integrated on both sides of an elastic fiber sheet composed of elastic fiber aggregates, (2) net-like A sheet in which stretchable fiber aggregates are integrated in a natural state on at least one side of the elastic sheet, (3) an elastic nonwoven sheet composed of only elastic fiber aggregates, and (4) unidirectional without crossing each other. A disposable diaper or a diaper cover according to <19>, wherein a large number of elastic filaments arranged so as to extend are bonded to an extensible nonwoven fabric over the entire length thereof in a substantially non-stretched state .
<21> The ratio of the length of the non-fixed region in the longitudinal direction of the diaper to the length in the longitudinal direction of the ventral portion is 10% or more, preferably 50% or more, from <1> to <20> The disposable diaper or diaper cover of any one.
<22> The ratio of the length of the non-fixed region in the longitudinal direction of the diaper to the length in the longitudinal direction of the ventral side is 100% or less, according to any one of <1> to <21>. Disposable diapers or diaper covers.
<23> The disposable diaper or the diaper cover according to any one of <1> to <22>, wherein the length of the non-fixed region in the longitudinal direction of the diaper is 2 cm or more, preferably 10 cm or more.
<24> The disposable diaper or diaper cover according to any one of <1> to <23>, wherein the length of the non-fixed region in the longitudinal direction of the diaper is 25 cm or less, preferably 20 cm or less.
<25> The length in the width direction of the non-fixed region is such that the ratio to the length between the side seal portions on the ventral side is 30% or more, preferably 40% or more, more preferably 50% or more. The disposable diaper or diaper cover according to any one of 1> to <24>.
<26> The length in the width direction of the non-fixed region according to any one of <1> to <25>, wherein a ratio with respect to a length between the side seal portions on the ventral side is 100% or less. Disposable diapers or diaper covers.
<27> The disposable diaper or the diaper cover according to any one of <1> to <26>, wherein an upper end side of the intermediate sheet 13 is fixed to another member.
<28> The disposable diaper or the diaper cover according to any one of <1> to <26>, wherein the upper end side of the intermediate sheet 13 is not fixed to another member.
<29> A waist elastic region in which a waist elastic member is disposed, and the waist elastic member is positioned only on the outermost layer sheet 12 and on the inner surface side thereof only through an adhesive applied to the elastic member. The disposable diaper or diaper cover according to any one of <1> to <28>, which is joined to the diaper 14.

<30> The number of the waist elastic members that have the waist elastic region in which the waist elastic members are arranged and are intermittently arranged in the longitudinal direction of the diaper or the diaper cover is three or more, preferably four or more. The disposable diaper or diaper cover described in any one of <1> to <29>.
<31> The number of waist elastic members having a waist elastic region in which waist elastic members are arranged and intermittently arranged in the longitudinal direction of the diaper or the diaper cover is 15 or less, preferably 12 or less. The disposable diaper or diaper cover described in any one of <1> to <30>.
<32> The outermost layer sheet 12 has folded portions 12a and 12b extending to positions overlapping the end portions of the absorbent main body 10, and the folded portions 12a and 12b constitute the innermost layer sheet 15 in the multilayer region R. The disposable diaper or diaper cover described in any one of <1> to <31>.
<33> The disposable diaper according to any one of <1> to <32>, which has an absorbent body.
<34> The disposable diaper according to <33>, wherein the non-fixed region is formed at least at a site outside the side edge of the absorbent body in the diaper width direction.

<35> The disposable diaper according to <33> or <34>, wherein both end portions of the intermediate sheet 13 in the diaper width direction are fixed to a pair of side seal portions S, S.
<36> 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 edges on the ventral side and both side edges on the back side The non-fixed areas of the ventral side and the dorsal part are substantially all except for the vicinity of the side seal part of the annular waistline area in which the waistline area of the ventral part and the waistline area of the dorsal part are connected in an annular shape. The disposable diaper according to any one of <33> to <35>, which is formed over the circumference.

A Abdominal side A1 Waist elastic area A2 Girth area 10 Absorbent body 40 Absorbent core 4 Absorber 11 Exterior body 12 Outermost layer sheet 13 Intermediate sheet R Laminated area 14 Inner surface forming sheet 15 Innermost layer sheet R1 Unfixed area of intermediate sheet R2 Stretchable part 16 Adhesive 17 Adhesive 51 Waist elastic member 71 Elastic member for imparting stretchability to non-fixed region

Claims (5)

Ventral sides arranged on the ventral side of the wearer, have a crotch portion located between the back side, and the ventral and dorsal sides disposed to the back side of the wearer, in the ventral A pants-type disposable diaper in which both side edge portions and both side edge portions in the back side portion are joined together to form a pair of side seal portions, a waist opening portion and a pair of leg opening portions ,
The outermost layer sheet that forms the outer surface of the diaper, the innermost layer sheet that forms the inner surface in contact with the wearer's skin, and the outermost layer sheet and the outermost layer in at least the ventral region of the ventral part and the dorsal part. The intermediate sheet located between the inner layer sheet has a multilayer region overlapped in the thickness direction,
The intermediate sheet is Oite in the multilayer region, both end portions of the diaper width direction is fixed to a pair of the side seal part, over the entire width between the pair of the side seal portion, the outermost sheet and the innermost layer has a non-fixed region that is not also fixed to either the seat, the non-fixed region has a stretchable in the diaper width direction,
Each of the outermost layer sheet and the innermost layer sheet is a non-stretchable sheet and is a pants-type disposable diaper in which an elastic member is not fixed to a region overlapping the non-fixed region . The disposable diaper according to claim 1, wherein the non-fixed region includes a plurality of stacked sheets and an elastic member arranged in an extended state between the sheets. The disposable diaper according to claim 1, wherein the intermediate sheet includes only one sheet having elasticity. The non-fixed region of the multilayer region and the intermediate sheet is formed on each of the ventral portion and the back portion,
The non-fixed region of the ventral side and the back side extends over substantially the entire circumference excluding the vicinity of the side seal portion of the annular waist region in which the waist region of the abdomen and the waist region of the back side are connected in a ring shape. The disposable diaper of any one of Claims 1-3 currently formed. Ventral sides arranged on the ventral side of the wearer, have a crotch portion located between the back side, and the ventral and dorsal sides disposed to the back side of the wearer, in the ventral A pants-type diaper cover in which both side edge portions and both side edge portions in the back side portion are joined together to form a pair of side seal portions, a waist opening portion and a pair of leg opening portions ,
The outermost layer sheet that forms the outer surface of the diaper cover, the innermost layer sheet that forms the inner surface in contact with the wearer's skin, and the outermost layer sheet in the waist region of at least the ventral side of the ventral side and the back side, and The intermediate sheet located between the innermost layer sheet has a multilayer region overlapped in the thickness direction,
The intermediate sheet, the Oite multilayer region, both end portions in the width direction of the diaper cover is fixed to the pair of the side seal part, over the entire width between the pair of the side seal portion, the outermost layer sheet, and has a non-fixed region that is not also fixed to one of the innermost layer sheet, non-stationary region has a stretchability in the width direction of the diaper cover,
Each of the outermost layer sheet and the innermost layer sheet is a non-stretchable sheet, and a pants-type diaper cover in which an elastic member is not fixed to a region overlapping the non-fixed region .

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