JP2018108338A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article whose absorption performance resists an obstruction by resisting occurrence of creases in an absorber and which looks nice and improves use feeling.SOLUTION: An absorbent article 1 according to this invention has, in a ventral side elastic portion WA and a dorsal side elastic portion WB, a main body side sheet 32 which is joined to an absorbent body 2 and an outer surface side sheet 31. The main body side sheet 32 or the outer surface side sheet 31 is an elastic sheet. The elastic sheet has high stretch portions 31H and low stretch portions 31L alternately arranged in a Y direction. The elastic sheet is disposed in the ventral side elastic portion WA or the dorsal side elastic portion WB, and in a region 23PT that overlaps with an absorber 23, the high stretch portions 31H of the elastic sheet are joined to form first joined portions 1JT. In a region 23NT that does not overlap with the absorber 23, the low stretch portions 31L of the elastic sheet are joined to form second joined portions 2JT, and second non-joined portions 2NJT, where the high stretch portions 31H of the elastic sheet are not joined, are formed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to absorbent articles such as disposable diapers and sanitary napkins.

  For example, in a pants-type disposable diaper, an exterior body is disposed on the outside of a vertically long absorbent main body provided with an absorber. As a stretchable composite sheet used for such an exterior body, for example, a composite sheet described in Patent Document 1 is known.

  The stretchable composite sheet described in Patent Literature 1 is a sheet that includes a non-stretchable sheet, a stretchable nonwoven fabric, and an adhesive portion that bonds the nonstretchable sheet and the stretchable nonwoven fabric. If such a stretchable composite sheet is used as an exterior body of a pants-type disposable diaper, for example, the appearance of the disposable diaper is good and the feeling of use is improved.

WO2008 / 066009 pamphlet

  However, in Patent Document 1, when a stretchable composite sheet in which a non-stretchable sheet and a stretchable nonwoven fabric are bonded together at an adhesive portion is used for an exterior body, the absorbent body includes the composite sheet and an absorbent material. There is no description about the joining position. For example, if a stretchable composite sheet is simply bonded and placed at a position overlapping with the absorber, the composite sheet shrinks and wrinkles are generated in the absorber, which may hinder the absorption performance of the absorber and cause leakage. There is.

  Therefore, this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention includes an absorbent body that includes an abdominal region and a dorsal region in the longitudinal direction, and a crotch region positioned therebetween, and includes an absorbent material across the abdominal region and the dorsal region. An absorbent article having an absorptive main body that has a ventral side stretchable part and a back side stretchable part extending in a lateral direction in each of the ventral region and the dorsal side region, wherein the ventral side stretchable part and the dorsal side Each of the stretchable parts has a main body side sheet joined to the absorbent main body and an outer surface side sheet disposed on the non-skin facing surface of the main body side sheet, and the main body side sheet and the outer surface side sheet At least one is a stretchable sheet having a stretchability in the lateral direction, and the stretchable sheet has a relatively stretchable high stretchable portion and a relatively stretchable low stretchable portion alternately arranged in the lateral direction. At least of the ventral stretchable part and the dorsal stretchable part On the side, the stretchable sheet is disposed, and in the region overlapping with the absorber, the main body side sheet and the outer surface side sheet form a first joint portion joined at the high stretchable portion, and from the absorber In the region that does not overlap with the outer absorbent body, the main body side sheet and the outer surface side sheet form a second joint part joined at the low stretch part and are not joined at the high stretch part. (2) An absorbent article that forms a non-bonded portion is provided.

  According to the present invention, it is difficult for wrinkles to be generated in the absorbent body, the absorbent performance is hardly hindered, the appearance of the absorbent article is good, and the usability is improved.

FIG. 1 is a perspective view of a pants-type disposable diaper that is a preferred embodiment of the present invention. FIG. 2 is a partially broken plan view of the diaper shown in FIG. 1 unfolded and stretched as viewed from the skin contact surface side. FIG. 3 is an exploded perspective view schematically showing the diaper shown in FIG. 1 in an exploded manner. FIG. 4 is a perspective view of a stretchable outer sheet that constitutes the diaper shown in FIG. 1. 5 is a cross-sectional view taken along line VV shown in FIG. 6A is a cross-sectional view taken along the line VI-VI shown in FIG. 2, and FIG. 6B is a cross-sectional view showing the contracted state of FIG. 6A.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
The absorbent article of the present invention comprises a ventral region A and a dorsal region B in the longitudinal direction X, and a crotch region C positioned between the A and B, and includes a ventral region A and a dorsal region B. It has the absorber 23 containing an absorptive material over, and has the ventral | extension-side expansion-contraction part WA and the back | dorsal-side expansion / contraction part WB which extend in the horizontal direction Y in each of the ventral | abdominal area | region A and the back | dorsal area | region B. Here, the abdominal region A is a region disposed on the wearer's abdomen when wearing the disposable diaper, and the back region B is a region disposed on the wearer's back when wearing the disposable diaper. . And the abdominal side expansion-contraction part WA is formed in the abdominal side area | region A distribute | arranged to such a wearer's abdominal side. Moreover, the back side expansion-contraction part WB is formed in the back side area | region B distribute | arranged to such a wearer's back side.

  1 and 2 show a pants-type disposable diaper 1 (hereinafter also referred to as “diaper 1”) which is an embodiment of the absorbent article of the present invention. As shown in FIGS. 1 and 2, the diaper 1 includes an absorbent main body 2 and an exterior body 3 that is arranged on the non-skin-facing surface side of the absorbent main body 2 and fixes the absorbent main body 2. 3 includes an abdominal stretchable part WA and a dorsal stretchable part WB extending in the lateral direction Y in the ventral region A and the dorsal region B, respectively. The diaper 1 includes a pair of side seal portions 5 and 5 in which left and right side edges 3a1 and 3a1 of the ventral region A of the exterior body 3 and left and right side edges 3b1 and 3b1 of the back region B of the exterior body 3 are joined. A disposable diaper in which a waist opening WH and a pair of leg openings LH, LH are formed. Preferably, the outer body 3 of the diaper 1 is, as shown in FIG. 2, a plan view of the expanded and extended state, and a ventral region A disposed on the wearer's ventral side when worn, worn when worn. It is divided into a dorsal region B disposed on the back side of the person and a crotch region C between the ventral region A and the dorsal region B.

  As shown in FIG. 2, the state in which the diaper 1 is expanded and stretched is peeled off from the side seal portion 5 so that the diaper 1 is in the expanded state. Is extended to the design dimension (same as the dimension when flattened in a state where the influence of the elastic member is completely eliminated).

In the present specification, the “skin facing surface” is a surface of the diaper 1 or a component thereof that faces the wearer's skin when worn, and the “non-skin facing surface” refers to the diaper 1 or a component thereof. Is a surface that is directed to the side opposite to the wearer's skin side (clothing side) when worn. In the diaper 1, the vertical direction (X direction) is a direction extending from the ventral region A to the dorsal region B in a state where the diaper 1 is expanded and extended on a plane. Moreover, the horizontal direction (Y direction) is a direction orthogonal to the vertical direction (X direction), and is the width direction of the diaper 1 in a state where the diaper 1 is expanded and extended on a plane.
Moreover, the diaper 1 is a left-right symmetric form with respect to the vertical centerline CL1 extended in a vertical direction (X direction) shown in FIG. 2 is a horizontal center line extending in the horizontal direction (Y direction) that bisects the diaper 1 in the vertical direction (X direction), and is orthogonal to the vertical center line CL1.

  In the diaper 1, the absorptive main body 2 has a vertically long shape in which the longitudinal direction (X direction) is relatively long in a state where the diaper 1 is unfolded and extended as shown in FIG. The absorptive main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, a liquid-permeable surface sheet (including water repellency) that forms a non-skin-facing surface, and both of these sheets 21 and 22. And a liquid-retaining absorbent 23 interposed therebetween. In the diaper 1, the total length in the longitudinal direction (X direction) of the absorbent main body 2 is the same as that of the absorber 23, and the positions of the outer ends 23A1, 23B1 of the front and rear end portions 23A, 23B of the absorber 23 are shown in FIG. As shown, it is in the same position as the position of the outer end of the front and rear ends of the absorbent main body 2. Further, on both sides along the longitudinal direction (X direction) of the absorbent main body 2, as shown in FIG. 2, a leak-proof cuff 24 having an elastic member 25 arranged in an elongated state in the longitudinal direction (X direction), 24 is provided. Specifically, the leak-proof cuff 24 is made of a liquid-impermeable or water-repellent and breathable material, and in the vicinity of the free end of each leak-proof cuff 24, a leak-proof cuff forming elastic member. 25 is arranged in a state of extending in the vertical direction (X direction). When the diaper is worn, the free end portion side of the leak-proof cuff 24 rises due to the contraction of the leak-proof cuff forming elastic member 25, and the outflow of body fluid in the lateral direction (Y direction) is prevented.

  As shown in FIG. 2, the absorbent main body 2 configured as described above has its longitudinal direction (X direction) aligned with the longitudinal direction (X direction) of the diaper 1 in the unfolded and extended state. The main body fixing adhesive 4 is joined to the central portion of 3. As shown in FIG. 3, the application position of the main body fixing adhesive 4 is formed at a position corresponding to at least both side portions along the longitudinal direction X of the absorbent main body 2. As described above, the exterior body 3 is arranged on the non-skin facing surface side of the back sheet 22 constituting the absorbent main body 2 in the thickness direction of the disposable diaper 1 and is bonded and fixed by the main body fixing adhesive 4. Therefore, in the diaper 1, the absorbent body 23 constituting the absorbent main body 2 is disposed across the ventral region A and the back region B.

  Each of the ventral side stretchable part WA and the back side stretchable part WB has a main body side sheet 32 joined to the absorbent main body 2 and an outer surface side sheet 31 arranged on the non-skin facing surface of the main body side sheet 32. doing. In the present invention, at least one of the main body side sheet 32 and the outer surface side sheet 31 is an elastic sheet having elasticity in the lateral direction. In the diaper 1, the outer surface sheet 31 has elasticity in the lateral direction (Y direction). It is an elastic sheet. Moreover, in this invention, the said elastic sheet should just be distribute | arranged to at least one of the abdominal expansion-contraction part WA and the back | dorsal expansion-contraction part WB. In the diaper 1, in the abdominal expansion-contraction part WA and the dorsal expansion-contraction part WB. The stretchable sheet is arranged on both. In the diaper 1, the main body side sheet 32 is a non-stretchable sheet that does not have stretchability.

  In the diaper 1, as shown in FIG. 3, the exterior body 3 that adheres and fixes the absorbent main body 2 includes an outer surface side sheet 31 that forms an outer surface of the diaper 1, that is, a non-skin facing surface, and an outer surface side sheet 31. The main body side sheet 32 is disposed opposite to the skin facing surface, and includes a laminate of the outer surface side sheet 31 and the main body side sheet 32. In the wearing state of the diaper 1, the outer surface side sheet 31 is positioned on the side far from the wearer's body to form a non-skin facing surface (outer surface) of the diaper 1, and the main body side sheet 32 is closer to the wearer's body. The skin facing surface (inner surface) of the diaper 1 is formed. The outer surface side sheet 31 and the main body side sheet 32 are joined to each other at a predetermined portion via joining means such as heat sealing, ultrasonic sealing, and adhesive.

  In the diaper 1, as shown in FIG. 3, the main body side sheet 32 is composed of a single continuous sheet, whereas the outer surface side sheet 31 is composed of a combination of a plurality of sheets. Specifically, the crotch region C is configured by being positioned between the abdominal outer surface side sheet 31A configuring the ventral region A, the back outer surface sheet 31B configuring the back region B, and both the sheets 31A and 31C. The crotch outer surface side sheet 31 </ b> C is included. Each of the sheets 31A, 31B, 31C constituting the outer surface side sheet 31 is overlapped with each other in the longitudinal direction X, and in the overlapped portion, known adhesives, heat seals, high frequency seals, ultrasonic seals, and the like are known. They are joined and integrated by the joining means. In the overlapping portion of the sheets 31A and 31C and the sheet 31B, the sheet 31B located in the center of the longitudinal direction X is located on the side relatively close to the absorbent main body 2, and both ends of the sheet 31B in the longitudinal direction X The non-skin facing surface of the part is covered with sheets 31A and 31C.

  In the diaper 1, as shown in FIG. 3, the ventral outer surface side sheet 31 </ b> A includes a ventral side extension portion 31 </ b> AE that extends outward from the end in the longitudinal direction X on the ventral side region A side of the main body side sheet 32. Further, the back side outer surface side sheet 31B has a back side extending part 31BE extending outward from the end in the longitudinal direction X on the back side region B side of the main body side sheet 32, The extending portions 31AE and 31BE are folded back toward the main body side sheet 32 so as to cover both ends in the longitudinal direction X of the absorbent main body 2 arranged and fixed on the main body side sheet 32, and both are attached by an adhesive. It is being fixed to the other structural member (The main body side sheet | seat 32, the absorptive main body 2, the leak-proof cuff 24) facing the extension parts 31AE and 31BE.

  As described above, the outer surface side sheet 31 of the diaper 1 is stretchable in the lateral direction Y. In particular, in the diaper 1, the outer surface side sheet 31 is partially stretchable in the lateral direction Y. That is, in the diaper 1, as shown in FIG. 3, among the three abdominal outer surface sheets 31 </ b> A, the back outer surface sheet 31 </ b> B, and the crotch outer surface sheet 31 </ b> C constituting the outer surface sheet 31, 31A and the back outer surface side sheet 31B have elasticity in the lateral direction Y, and the crotch outer surface side sheet 31C does not have elasticity and is non-elastic.

  In the present invention, “having stretchability in the lateral direction Y” means that the maximum elongation in the lateral direction Y of the stretchable sheet is 100% or more, and the sheet is stretched up to 100% in the lateral direction Y. It means that the elongation recovery rate (elongation recovery rate at 100% elongation) when contracted after stretching is at least 70% or more. In the diaper 1, both the ventral outer surface side sheet 31 </ b> A and the back outer surface side sheet 31 </ b> B are sheets having elasticity in the lateral direction Y. The elongation recovery rate of the sheet is measured by the following measuring method.

<Measurement method of sheet elongation recovery rate>
A sample piece having a length of 50 mm and a width of 25 mm is prepared from the sheet to be measured. A sample piece is fixed between the chucks (chuck interval K0) of a tensile tester (Orientec Co., Ltd. “Tensilon” RTC-1150A), and the sample piece is pulled by expanding the gap between the chucks at a tensile speed of 300 mm / min. After extending to the length K2 (= K0 × 2) at the time of 100% elongation, the gap between the chucks is narrowed at the same speed as the tensile speed, and the length of the sample piece when the tensile stress becomes zero is obtained. The length is K1 after recovery from elongation. The elongation recovery rate at the time of 100% elongation of the sheet to be measured is calculated by the following formula.
Elongation recovery rate at 100% elongation (%) = [(K2−K1) / (K2−K0)] × 100

  In the present invention, the non-stretchable sheet means a sheet having an elongation recovery rate of 20% or less measured by the above <Method for measuring elongation recovery rate of sheet> or a sheet that breaks before 100% elongation. . In the diaper 1, the crotch outer surface side sheet 31C and the main body side sheet 32 are both non-stretchable sheets.

  As the stretchable ventral outer surface side sheet 31A and the back outer surface side sheet 31B of the diaper 1, for example, (1) an elastic sheet in which stretchable fiber layers are integrated on both surfaces or one surface of the elastic fiber layer, (2 ) An elastic sheet in which stretchable fiber layers are integrated on both sides or one side of a net-like elastic sheet, (3) An extensible fiber layer is integrated on both sides or one side of an elastic sheet made of an elastic film. Stretch sheet, (4) Stretch sheet in which a large number of elastic filaments arranged so as to extend in one direction without crossing each other are bonded to a stretchable nonwoven fabric over their entire length in a substantially non-stretched state, etc. Can be preferably used. Examples of the method of integrating the elastic fiber layer and the extensible fiber layer include, for example, laminating them and hydroentangled them, or entangled fibers by air-through, etc., heat embossing, adhesive, ultrasonic bonding, etc. The method of letting you do is mentioned.

  In the diaper 1, the outer surface side sheet 31 that is a stretchable sheet has a high stretchable portion 31 </ b> H having a relatively high stretchability and a low stretchable portion 31 </ b> L having a relatively low stretchability alternately arranged in the lateral direction Y. Preferably, in the diaper 1, as shown in FIGS. 5 and 6, the stretchable abdomen outer sheet 31 </ b> A and the dorsal outer sheet 31 </ b> B constituting the outer sheet 31 are composed of a high stretch part 31 </ b> H and a low stretch part. 31L are alternately arranged in the horizontal direction Y.

  FIG. 4 shows a preferred example of the stretchable sheet used for the diaper 1. An abdominal outer surface side sheet 31A and a back outer surface side sheet 31B shown in FIG. 4 correspond to the stretchable sheet of (4) above, and are elastic on a surface of a stretchable fiber layer mainly composed of nonelastic fibers. It has a configuration in which filaments are joined, and includes two fiber sheets 36 and 37 as the fiber layers, and an elastic member 38 as the elastic filament interposed between the sheets 36 and 37. Yes. In the stretchable ventral outer surface side sheet 31A and the back outer surface side sheet 31B having such a configuration, for example, according to the method described in Japanese Patent Application Laid-Open No. 2009-61743, teeth and roots are alternately formed in the circumferential direction. It is formed by being inserted into a meshing portion of a pair of tooth gap rolls and stretched. The high expansion / contraction part 31H is a part greatly extended by the teeth of one tooth gap roll and the teeth of the other tooth gap roll, and the low expansion / contraction part 31L is the tooth of one tooth groove roll and the other tooth gap roll. It is a site that is in contact with each of the teeth and is hardly stretched. In the stomach side outer surface side sheet 31A and the back side outer surface side sheet 31B of the diaper 1, a high stretch part 31H extending continuously in the longitudinal direction X and a low stretch part 31L extending continuously in the longitudinal direction X are in the lateral direction Y. Are alternately arranged.

  In the diaper 1, the two sheets 36 and 37 (see FIG. 4) constituting the stretchable ventral outer surface sheet 31 </ b> A and the back outer surface sheet 31 </ b> B are both extensible. The sheets 36 and 37 can be extended in the same direction as the direction in which the elastic member 38 extends (lateral direction Y). Stretchable means (a) the case where the constituent fibers themselves of the sheets 36 and 37 are stretched, and (b) even if the constituent fibers themselves are not stretched, This includes the case where the three-dimensional structure formed by a plurality of fibers is structurally changed due to bonding or the like, or the constituent fibers are broken, and the sheets 36 and 37 are extended as a whole.

  In the diaper 1, the elastic member 38 (see FIG. 4) constituting the stretchable ventral outer surface sheet 31 </ b> A and the back outer surface sheet 31 </ b> B is an elastic filament formed by being stretched in a state where the elastic resin is melted or softened. It is. The plurality of elastic members 38 are substantially continuous over the entire length of the ventral outer surface side sheet 31A and the back outer surface side sheet 31B (the total length in the lateral direction Y of the exterior body 3). The plurality of elastic members 38 are arranged so as to extend in one direction (lateral direction Y) without crossing each other. The elastic member 38 is joined to the two sheets 36 and 37 in a substantially non-extended state. The joining of the elastic member 38 to the sheets 36 and 37 in the ventral outer surface side sheet 31A and the back outer surface side sheet 31B is performed in a state where the fibers (non-elastic fibers) constituting the sheets 36 and 37 are buried in the elastic member 38. It is made by fusing to the elastic member 38 and is not made by using an adhesive such as a hot-melt adhesive. Therefore, there is no adhesive between the sheets 36 and 37 (extensible fiber layer mainly composed of non-elastic fibers) and the elastic member 38 bonded thereto.

  In the diaper 1, the stretchable ventral outer surface side sheet 31A and the back outer surface side sheet 31B can be expanded and contracted in the same direction as the direction in which the elastic member 38 extends (lateral direction Y) (see FIG. 4). The stretchability of the ventral outer surface side sheet 31A and the back outer surface side sheet 31B is expressed due to the elasticity of the elastic member 38 in the high stretchable part 31H. When the ventral outer surface side sheet 31A and the back outer surface side sheet 31B are stretched in the same direction as the direction in which the elastic member 38 extends, the elastic member 38 and the sheets 36 and 37 in the high expansion / contraction region 31H expand, while in the low expansion / contraction region 31L. The elastic member 38 and the sheets 36 and 37 do not extend. When the stretching of the abdominal outer surface side sheet 31A and the back outer surface side sheet 31B is released, the elastic member 38 in the high stretchable region 31H contracts, and the sheets 36 and 37 in the high stretchable region 31H are stretched before the contraction. Return to the state.

  With respect to each of the high expansion / contraction part 31H and the low expansion / contraction part 31L, the length in the extending direction (lateral direction Y) of the elastic member 38 is the length of the high expansion / contraction part 31H in the horizontal direction Y when the contraction is 100%. On the premise that the length is longer than the length in the lateral direction Y of the low stretchable portion 31L, the high stretchable portion 31H is preferably 130% or more, more preferably 300% or more, and the upper limit is 600%. The following is preferable. And it is preferable that the low expansion-contraction site | part 31L is 200% or less, it is still more preferable that it is 170% or less, and it is preferable that a lower limit is 100% or more. The length at the time of extension is measured by the following measuring method.

<Length at the time of the expansion | extension of the horizontal direction Y of the high expansion-contraction site | part 31H and the low expansion-contraction site | part 31L>
A stretchable sheet in which high stretchable portions 31H and low stretchable portions 31L are alternately arranged in the lateral direction Y is a rectangular sample having a size of 200 mm in the extending direction of the elastic member 38 (lateral direction Y) and 50 mm in the longitudinal direction X. Cut out a piece. Then, using a pen or the like, the high stretchable part 31H and the low stretchable part 31L are marked, and the length in the lateral direction Y of each of the high stretchable part 31H and the low stretchable part 31L is measured in advance. The sample piece is attached to Tensilon RTC1210A manufactured by Orientec. The distance between chucks is 150 mm. The attached sample piece is extended at a speed of 100 mm / min in the direction in which the elastic member 38 extends (lateral direction Y), and when the sample piece stops growing, the portions of the high and low expansion / contraction portions 31H and 31L at the time of extension The length in each lateral direction Y is measured. Then, when the length in the lateral direction Y of the portion of the high stretchable portion 31H obtained is La and the length in the lateral direction Y of the portion of the high stretchable portion 31H at the time of extension is Lb, {Lb / La} × 100 is calculated as the length (%) of the highly stretchable part 31H when stretched in the lateral direction Y. In addition, the length (%) of the low expansion / contraction part 31L when extending in the lateral direction Y is calculated in the same manner.

  In the diaper 1, the two sheets 36 and 37 (see FIG. 4) constituting the ventral outer surface side sheet 31 </ b> A and the back outer surface side sheet 31 </ b> B can each be a nonwoven fabric of short fibers. Examples of the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric. The sheet 36 and the sheet 37 may be the same type or different types. As used herein, the “same type of sheet” means sheets having the same manufacturing process, types of constituent fibers of the sheet, fiber diameters and lengths of the constituent fibers, sheet thickness, basis weight, and the like. . If at least one of these is different, it is a “dissimilar sheet”.

  In the diaper 1, the elastic member 38 (elastic filament) (see FIG. 4) constituting the stretchable ventral outer surface side sheet 31A and the back outer surface side sheet 31B is made of, for example, a thermoplastic elastomer or rubber. is there. In particular, when thermoplastic elastomer is used as a raw material, melt spinning using an extruder is possible in the same way as ordinary thermoplastic resins, and the elastic filament thus obtained is easy to heat-seal. It is suitable for the outer surface side sheet 31A and the back side outer surface side sheet 31B. Examples of the thermoplastic elastomer include styrene such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), and SEPS (styrene-ethylene-propylene-styrene). -Based elastomers, olefin-based elastomers (ethylene-based α-olefin elastomers, propylene-based elastomers copolymerized with ethylene, butene, octene, etc.), polyester-based elastomers, polyurethane-based elastomers, and the like. Two or more kinds can be used in combination. Further, core-sheath type or side-by-side type composite fibers made of these resins can also be used.

  On the other hand, in the diaper 1, non-stretchable crotch outer surface side sheet 31C and main body side sheet 32 (see FIG. 3) are preferably non-woven fabrics produced by various manufacturing methods, for example, spunbonded non-woven fabric, air-through non-woven fabric, needle punched non-woven fabric. Etc. Examples of the constituent fibers of the nonwoven fabric used as the non-stretchable sheets 31C and 32 include fibers made of polyester such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide, and the like. Etc. The fibers constituting the nonwoven fabric used as the non-stretch crotch outer surface side sheet 31C and the main body side sheet 32 may be short fibers or long fibers, and may be hydrophilic or water repellent. Moreover, a core-sheath type or side-by-side type composite fiber, a split fiber, a modified cross-section fiber, a crimped fiber, a heat-shrinkable fiber, or the like can also be used. These fibers can be used alone or in combination of two or more.

  In the diaper 1, as shown in FIGS. 2 and 3, a plurality of thread-like or belt-like waist elastic members 33 are arranged in the lateral direction Y in each of the ventral region A and the dorsal region B. The waist elastic members 33 are intermittently arranged at predetermined intervals in the longitudinal direction X. As described above, the waist elastic member 33 is arranged in a state in which the elastic stretchability is expressed, so that the opening edge of the waist opening WH has an annular waist gather substantially continuous over the entire circumference. Is formed. Further, one or more leg gathering leg elastic members 34 in the form of yarns or strips are arranged in an extended state on the leg edges forming the opening edges of the pair of leg openings LH, LH. Thus, an annular leg gather substantially continuous over the entire circumference is formed at the opening edge of each of the pair of leg openings LH, LH. These elastic members 33 and 34 are both clamped and fixed between the outer surface side sheet 31 and the main body side sheet 32 constituting the exterior body 3 by a bonding means such as an adhesive.

  In the diaper 1, the abdominal side stretchable part WA and the back side stretchable part WB are formed on the non-skin facing surface of the main body side sheet 32 from the stretchable sheet as shown in FIGS. 5 and 6A, respectively. The sheet 31 is formed so as to be extended in the lateral direction Y. Preferably, the belly side stretchable part WA of the diaper 1 is formed by stretching and fixing a stretchable belly side outer surface side sheet 31 </ b> A in the lateral direction Y on the non-skin facing surface of the main body side sheet 32. In addition, the back-side stretchable part WB of the diaper 1 is formed by a stretchable back-side outside sheet 31 </ b> B being arranged and fixed in a laterally extending state on the non-skin facing surface of the main body-side sheet 32. Here, when the outer surface side sheet 31 is arranged in a stretched state in the lateral direction Y, as shown in FIG. 2, the thread-like or belt-like waist elastic member 33 and leg elastic member 34 and the elastic member 38 which is an elastic filament are extended. In other words, it means a state in which it is expanded until it reaches a design dimension (same as the dimension when it is expanded in a flat shape with no influence of the elastic member).

  In the region 23PT overlapping the absorber 23, the body side sheet 32 and the outer surface side sheet 31 are joined to the ventral side stretchable part WA and the back side stretchable part WB of the diaper 1 at the high stretchable part 31H of the stretchable sheet. In the region 23NT that forms the first joint portion 1JT and does not overlap the outer absorber 23 than the absorber 23, the main body side sheet 32 and the outer surface side sheet 31 are joined at the low stretch portion 31L of the stretchable sheet. The second non-joining part 2NJT is formed which forms the two joining parts 2JT and is not joined at the high stretch part 31H of the stretchable sheet. Preferably, in the ventral side stretchable part WA and the back side stretchable part WB of the diaper 1, respectively, as shown in FIG. 5, a main body side sheet 32 that is a non-stretchable sheet and an outer surface side sheet 31 that is a stretchable sheet, In the region 23PT that overlaps with the absorber 23, the main body side sheet 32 and the high expansion / contraction part 31H of the outer surface side sheet 31 are joined at the first joining part 1JT. And in the ventral side expansion-contraction part WA and the back side expansion-contraction part WB of the diaper 1, in the area | region 23NT which does not overlap with the absorber 23 of the outer side rather than the absorber 23, respectively, the low expansion-contraction of the main body side sheet | seat 32 and the outer surface side sheet | seat 31 The part 31L is joined at the second joining part 2JT, and the main body side sheet 32 and the high expansion / contraction part 31H of the outer surface side sheet 31 are not joined.

  Preferably, in the ventral region A of the diaper 1, the stretchable abdominal outer surface side sheet 31 </ b> A is disposed in the stretched state in the lateral direction Y on the non-skin facing surface of the non-stretchable main body side sheet 32, as shown in FIG. 5. As described above, in the region 23PT where the main body side sheet 32 and the abdominal outer surface side sheet 31A overlap with the absorbent body 23, the main body side sheet 32 and the stretchable high stretchable region 31H of the abdominal outer surface side sheet 31A are the first joint region 1JT. Are joined together to form an abdominal stretchable part WA. Furthermore, in the region 23NT where the main body side sheet 32 and the abdominal outer surface side sheet 31A do not overlap with the outer absorber 23 than the absorber 23, as shown in FIG. 6A, the main body side sheet 32 and the abdominal outer surface The low expansion / contraction part 31L of the extended state of the side sheet 31A is joined at the second joining part 2JT, and the main body side sheet 32 and the high expansion / contraction part 31H of the ventral outer surface side sheet 31A are not joined to form the ventral side stretchable part WA. In the ventral region A of the diaper 1, the “region 23NT not overlapping the absorber 23” is the longitudinal direction (X direction) of the absorber 23 constituting the absorbent main body 2 as shown in FIG. This is an end flap portion located on the outer side in the vertical direction X (on the opposite side to the horizontal center line CL2 side) than the outer end 23A1 of the front end portion 23A. Further, in addition to the end flap portion, the lower end of the end flap portion in the longitudinal direction X and the side seal portion 5 are located outward in the lateral direction Y from both side portions along the longitudinal direction (X direction) of the absorber 23. It means a region to which a side flap portion located between the lower end of the frame is added.

  As in the ventral region A shown in FIG. 5, in the dorsal region B of the diaper 1, the stretchable dorsal outer surface sheet 31 </ b> B extends in the lateral direction Y on the non-skin facing surface of the non-stretchable main body side sheet 32. In the region 23PT that is arranged in a state where the main body side sheet 32 and the back outer surface side sheet 31B overlap the absorber 23, the main body side sheet 32 and the stretched high stretchable portion 31H of the back outer surface side sheet 31B are first. It is joined at the joint part 1JT to form the back side stretchable part WB. Further, in the region 23NT where the main body side sheet 32 and the extended back side outer surface side sheet 31B do not overlap with the outer absorber 23 than the absorber 23, similarly to the ventral region A shown in FIG. The main body side sheet 32 and the extended low stretch part 31L of the back outer surface sheet 31B are joined at the second joint part 2JT, and the high stretch part 31H of the main body side sheet 32 and the back outer surface sheet 31B are extended. The back side stretchable part WB is formed without being joined. In the back region B of the diaper 1, the “region 23 NT that does not overlap the absorber 23” refers to the absorber 23 that constitutes the absorbent main body 2 as shown in FIG. 2, as in the ventral region A of the diaper 1. This is an end flap portion located on the outer side in the vertical direction X (the side opposite to the horizontal center line CL2 side) than the outer end 23B1 of the rear end portion 23B in the vertical direction (X direction). Further, in addition to the end flap portion, the lower end of the end flap portion in the longitudinal direction X and the side seal portion 5 are located outward in the lateral direction Y from both side portions along the longitudinal direction (X direction) of the absorber 23. It means a region to which a side flap portion located between the lower end of the frame is added.

  As described above, in the ventral side stretchable part WA and the back side stretchable part WB of the diaper 1, as shown in FIG. 5, the non-stretchable main body side sheet 32 and the stretchable outer surface side sheet 31 absorb, respectively. In the region 23PT that overlaps with the body 23, the main body side sheet 32 and the outer surface side sheet 31 are joined to each other at a stretched and highly stretched portion 31H. Therefore, in the region 23PT that overlaps with the absorber 23, even if the extended state of the outer sheet 31 is released, the contraction of the highly stretchable portion 31H is easily inhibited, and in the diaper 1, wrinkles are generated in the absorber 23. It is difficult and the absorption performance of the absorber 23 is hard to be inhibited.

  Further, in the ventral side stretchable part WA and the back side stretchable part WB of the diaper 1, as shown in FIG. 6A, the stretchability that forms the outer surface of the diaper 1 in the region 23 NT that does not overlap the absorber 23. The outer surface side sheet 31 is joined to the extended low stretch part 31 </ b> L and the main body side sheet 32 and is not joined to the high surface part 31 </ b> H of the outer side sheet 31 and the main body side sheet 32. Therefore, in the region 23NT that does not overlap with the absorber 23, when the extended state of the outer surface side sheet 31 is released as shown in FIG. 6B, the contraction of the highly stretchable portion 31H is hardly inhibited, and the outer surface of the diaper 1 is It is hard to generate wrinkles on the outer surface side sheet 31 to be formed, and the appearance of the outer surface of the diaper 1 is good. Moreover, when the extended state of the outer surface side sheet 31 is released, as shown in FIG. 6B, the pair of low stretchable portions 31L and 31L adjacent to the high stretchable portion 31H are joined by contraction of the high stretchable portion 31H. Since the part of the main body side sheet 32 between the parts of the main body side sheet 32 is easily deformed so as to swell toward the skin facing surface side, a space G is easily formed between the high stretchable part 31H, and as a result, the touch is good. In addition, the air permeability is improved and the feeling of use is improved. In particular, in the diaper 1, since the main body side sheet 32 is a non-stretchable sheet, the space G is more easily formed between the highly stretchable part 31H, the touch is easily improved, and the air permeability is further improved. The feeling of use is further improved.

  In the diaper 1, in the region 23PT that overlaps with the absorber 23, the main body side sheet 32 and the outer surface side sheet 31 form a first non-joined part 1NJT that is not joined by the low stretchable part 31L of the stretchable sheet. That is, in the region 23PT overlapping the absorber 23, as shown in FIG. 5, the main body side sheet 32 and the low expansion / contraction part 31L of the outer surface side sheet 31 formed of the expansion / contraction sheet are not joined. Preferably, in the region 23PT where the main body side sheet 32 and the abdominal outer surface side sheet 31A overlap the absorbent body 23 in the ventral region A of the diaper 1, the main body side sheet 32 and the abdominal outer surface side sheet 31A are in a stretched state. The stretchable part 31H is joined at the first joint part 1JT, and the main body side sheet 32 and the low stretchable part 31L of the ventral outer surface side sheet 31A are not joined at the first non-joint part 1NJT. Similarly, in the region 23PT where the main body side sheet 32 and the back outer surface side sheet 31B overlap with the absorber 23 in the back region B of the diaper 1, the main body side sheet 32 and the back outer surface side sheet 31B are in a stretched state. The stretchable part 31H is joined at the first joint part 1JT, and the main body side sheet 32 and the low stretchable part 31L of the back side outer surface side sheet 31B are not joined at the first non-joint part 1NJT.

  In the region 23PT that overlaps the absorbent body 23 of the diaper 1, as shown in FIG. 3, the first joint portion 1JT of the main body side sheet 32 and the outer surface side sheet 31 and the first non-joint of the main body side sheet 32 and the outer surface side sheet 31 The parts 1NJT are formed continuously in the vertical direction X and are alternately arranged in the horizontal direction Y. Preferably, in the region 23PT that overlaps with the absorber 23, the first joint part 1JT between the high-stretching part 31H of the abdominal outer surface side sheet 31A or the back outer surface side sheet 31B and the main body side sheet 32 continues in the longitudinal direction X. The first non-joining part 1NJT between the low-stretching part 31L of the ventral outer surface side sheet 31A or the back outer surface side sheet 31B and the main body side sheet 32 is continuous in the vertical direction X. And the 1st junction part 1JT which continues in the longitudinal direction X, and the 1st non-joining part 1NJT which continues in the longitudinal direction X are alternately arranged in the horizontal direction Y.

  In the diaper 1, in the region 23PT overlapping the absorber 23, as shown in FIG. 5, the main body side sheet 32 and the low expansion / contraction part 31L of the outer surface side sheet 31 are not joined by the first non-joining part 1NJT, The main body side sheet 32 and the high expansion / contraction part 31H of the outer surface side sheet 31 are joined at the first joining part 1JT. Further, in the region 23PT that overlaps with the absorber 23, as shown in FIG. 3, the first joint portion 1JT of the main body side sheet 32 and the outer surface side sheet 31 and the first non-joint portion of the main body side sheet 32 and the outer surface side sheet 31 are provided. 1NJT is formed continuously in the vertical direction X and is alternately arranged in the horizontal direction Y. For this reason, in the diaper 1, wrinkles are not easily generated in the absorbent body 23, and the absorption performance is hardly further inhibited.

  In the diaper 1, in the region 23NT that does not overlap with the outer absorber 23 than the absorber 23, as shown in FIG. 6A, the main body side sheet 32 and the low expansion / contraction part 31L of the outer surface side sheet 31 are second. The main body side sheet 32 and the high expansion / contraction part 31H of the outer surface side sheet 31 are not joined at the second non-joining part 2NJT. Also in the non-overlapping region 23NT, as shown in FIG. 3, the second joint part 2JT and the second non-joint part 2NJT are continuous in the vertical direction X, and the second joint part 2JT continuous in the vertical direction X The second non-joining sites 2NJT continuous in the direction X are alternately arranged in the lateral direction Y. Similarly, with respect to the folded portion of the waist, second joint portions 2JT continuous in the vertical direction X and second non-joint portions 2NJT continuous in the vertical direction X are alternately arranged in the horizontal direction Y. In the diaper 1, as shown in FIG. 3, at the boundary in the vertical direction X between the region 23 PT that overlaps the absorber 23 and the region 23 NT that does not overlap the absorber 23, the vertical direction X arranged in the region 23 PT that overlaps the absorber 23. The first joining part 1JT and the first non-joining part 1NJT that are continuous with the second joining part 2JT and the second non-joining part 2NJT that are continuous in the longitudinal direction X arranged in the region 23NT that does not overlap the absorber 23 are continuous. Not divided. Thus, at the boundary in the longitudinal direction X between the region 23PT that overlaps the absorber 23 and the region 23NT that does not overlap the absorber 23, the first joint portion 1JT and the second joint portion 2JT that are continuous in the longitudinal direction X are divided. And it is hard to generate | occur | produce more wrinkles in the absorber 23, and absorption performance is hard to be inhibited further.

  From the viewpoint of further preventing wrinkles from being generated in the absorber 23 in the region 23PT overlapping the absorber 23 and further preventing the absorption performance from being hindered, in the region 23PT overlapping the absorber 23, the main body side sheet 32 and the outer surface side sheet 31 It is preferable that the 1st junction site | part 1JT is formed in the whole region of the high expansion-contraction site | part 31H of the outer surface side sheet | seat 31. FIG. Preferably, in a state where the diaper 1 is unfolded and extended, the high expansion / contraction part 31H of the abdominal outer surface side sheet 31A or the back outer surface side sheet 31B is viewed in plan and surrounded by the outline of the high expansion / contraction part 31H. It is preferable that the first bonding site 1JT is formed in the entire region.

  Further, in the diaper 1, as shown in FIG. 5, the position of the fixing portion between the absorbent main body 2 and the exterior body 3, that is, the position where the main body fixing adhesive 4 is applied, and the main body in the region 23 PT overlapping the absorber 23. The position of the 1st junction part 1JT of the side sheet | seat 32 and the outer surface side sheet | seat 31 has overlapped. If overlapped in this way, wrinkles are less likely to occur in the absorber 23 in the region 23PT overlapping the absorber 23. From the viewpoint that wrinkles are less likely to occur in the absorbent body 23 in a cross-sectional view as shown in FIG. 5, the coated portion of the main body fixing adhesive 4 and the first joint portion 1JT are partially in the lateral direction Y. However, it is preferable that the entire region in the lateral direction Y of the first joint portion 1JT is included in the range in the lateral direction Y of the coating portion of the main body fixing adhesive 4.

  From the viewpoint of further achieving the effects described above, the diaper 1 preferably includes one or more of the following configurations.

The state in which the diaper 1 is unfolded and extended is viewed in plan as shown in FIG. 2, and the total sum of the lengths Y in the lateral direction Y of the region 23NT that does not overlap the absorber 23 with respect to the ventral region A (each side flap). The ratio of the length in the lateral direction Y of the region 23PT that overlaps the absorber 23 to the sum of the lengths in the lateral direction Y of the portion ((L _23PT / L _23NT ) × 100) prevents wrinkles from occurring in the absorber. From the viewpoint of preventing a decrease in absorption performance, it is preferably 20% or more, more preferably 30% or more, and preferably 65% or less, more preferably 55% or less, Specifically, it is preferably 20% or more and 65% or less, and more preferably 30% or more and 55% or less. Similarly, the back region B overlaps with the absorber 23 with respect to the total length in the lateral direction Y of the region 23NT that does not overlap with the absorber 23 (the total length in the lateral direction Y of each side flap portion). The ratio of the length in the lateral direction Y of the region 23PT ((L _23PT / L _23NT ) × 100) is preferably 20% or more, more preferably 30% or more, and 65% or less. It is preferably 55% or less, specifically 20% or more and 65% or less, and more preferably 30% or more and 55% or less.

The state of being allowed to expand and stretch the diaper 1 in a plan view as shown in FIG. 2, relates to the ventral region A, to the area of a region 23PT overlapping the absorber 23 (S _23PT), the body side sheet 32 ventral side outer surface The ratio ((S _1JT / S _23PT ) × 100) of the total area (S _1JT ) of the respective first joining sites 1JT, which is the joining site with the highly stretchable site 31H of the side sheet 31A, is 25% or more. Preferably, it is 35% or more, more preferably 70% or less, still more preferably 60% or less, specifically 25% or more and 70% or less, More preferably, it is 35% or more and 60% or less. Note that the dorsal region B is the same as the ventral region A.

Further, the state in which the diaper 1 is unfolded and extended is viewed in cross section as shown in FIG. 5, and the lateral direction of the highly stretchable part 31H of the outer surface side sheet 31 with respect to the region 23PT overlapping the absorber 23 in the ventral region A. The ratio of the length (W1) in the lateral direction Y of the first joint portion 1JT, which is the joint portion between the main body side sheet 32 and the highly elastic portion 31H of the abdominal outer surface side sheet 31A, to the length Y (W2) ((W1 / W2) × 100) is preferably 60% or more, more preferably 80% or more, and preferably 150% or less, more preferably 120% or less. Is preferably 60% or more and 150% or less, and more preferably 80% or more and 120% or less. Note that the dorsal region B is the same as the ventral region A.
By setting it in such a range, not only the wrinkle is prevented from occurring in the absorbent body, but also a gap is created by creating a non-adhered portion with the leak-proof sheet, and the effect of improving air permeability is more easily achieved. .

  Further, the state in which the diaper 1 is unfolded and extended is viewed in cross section as shown in FIG. 5, and the lateral direction of the low expansion / contraction part 31 </ b> L of the outer surface side sheet 31 with respect to the region 23 </ b> PT overlapping the absorber 23 in the ventral region A. The ratio of the length Y (W1) in the lateral direction Y of the first joint portion 1JT, which is the joint portion between the main body side sheet 32 and the highly stretchable portion 31H of the ventral outer surface side sheet 31A, to the length Y (W3) ((W1 / W3) × 100) is preferably 50% or more, more preferably 70% or more, and preferably 140% or less, more preferably 120% or less. Is preferably from 50% to 140%, and more preferably from 70% to 120%. Note that the dorsal region B is the same as the ventral region A.

  In addition, as shown in FIG. 5, the state in which the diaper 1 is unfolded and extended is viewed in cross-section, and the region 23PT that overlaps the absorber 23 in the ventral region A is fixed to the absorbent main body 2 and the exterior body 3. The ratio of the length (W2) in the lateral direction Y of the highly stretchable part 31H of the outer sheet 31 to the length (W4) in the lateral direction Y of the body fixing adhesive 4 ((W2 / W4) × 100) Is preferably 60% or more, more preferably 80% or more, and preferably 150% or less, more preferably 120% or less, specifically 60% or more. It is preferably 150% or less, and more preferably 80% or more and 120% or less. Note that the dorsal region B is the same as the ventral region A.

Further, when the diaper 1 is unfolded and stretched in plan view as shown in FIG. 2, the body side sheet 32 with respect to the area (S _23NT ) of the region 23NT that does not overlap the absorber 23 with respect to the ventral region A. The ratio ((S _2JT / S _23NT ) × 100) of the total area (S _2JT ) of each second joint portion 2JT, which is a joint portion between the outer surface side sheet 31 and the low expansion / contraction portion 31L, is 20% or more. It is preferably 35% or more, more preferably 75% or less, still more preferably 65% or less, and specifically 20% or more and 75% or less. Preferably, it is 35% or more and 65% or less. Note that the dorsal region B is the same as the ventral region A.
By setting it as such a range, the hot melt coating amount can be reduced, and the effect of improving the texture can be easily achieved by reducing the rigidity.

Further, when the diaper 1 is unfolded and stretched in plan view as shown in FIG. 2, the body side sheet 32 with respect to the area (S _23NT ) of the region 23NT that does not overlap the absorber 23 with respect to the ventral region A. A ratio ((S _2NJT / S _23NT ) × 100) of the total area (S _2NJT ) of each second non-joining part 2NJT, which is a part where the high-stretching part 31H of the outer surface side sheet 31 is not joined, is 25 % Or more, preferably 35% or more, more preferably 80% or less, still more preferably 65% or less, specifically 25% or more and 80% or less. It is preferable that it is 35% or more and 65% or less. Note that the dorsal region B is the same as the ventral region A.
By setting it as such a range, the hot melt coating amount can be reduced, and the effect of improving the texture can be easily achieved by reducing the rigidity.

Further, when the diaper 1 is unfolded and stretched in plan view as shown in FIG. 2, the total area of the second joint portions 2JT (with respect to the region 23NT that does not overlap the absorber 23 in the ventral region A ( for S _2JT), it (the proportion of _{S 2NJT) ((S 2NJT /} S 2JT) the sum of the areas of each of the second non-joint zones 2NJT × 100) is preferably 100% or more, 200% or more Is more preferably 1000% or less, more preferably 800% or less, specifically 100% or more and 1000% or less, and preferably 200% or more and 800% or less. More preferably. The region 23NT that does not overlap the absorber 23 in the back region B is the same as the region 23NT that does not overlap the absorber 23 in the ventral region A.

  Further, as shown in FIG. 6 (a), the diaper 1 is unfolded and stretched, as viewed in a cross section, with respect to the region 23NT that does not overlap the absorber 23 in the ventral region A, the highly stretchable portion of the outer sheet 31 The ratio of the length (W5) in the lateral direction Y of the second joint part 2JT, which is the joint part between the main body side sheet 32 and the low expansion / contraction part 31L of the outer surface side sheet 31, to the length (W2) in the lateral direction Y of 31H ((W5 / W2) × 100) is preferably 50% or more, more preferably 70% or more, and preferably 150% or less, more preferably 100% or less. Specifically, it is preferably 50% or more and 150% or less, and more preferably 70% or more and 100% or less. Note that the dorsal region B is the same as the ventral region A.

  Further, when the diaper 1 is unfolded and stretched as shown in FIG. 6A, the region 23NT that does not overlap with the absorbent 23 in the ventral region A is a low stretchable region of the outer sheet 31. The ratio of the length (W5) in the lateral direction Y of the second joint part 2JT, which is the joint part between the main body side sheet 32 and the low expansion / contraction part 31L of the outer surface side sheet 31, to the length (W3) in the lateral direction Y of 31L ((W5 / W3) × 100) is preferably 40% or more, more preferably 70% or more, and preferably 140% or less, more preferably 100% or less. Specifically, it is preferably 40% or more and 140% or less, and more preferably 70% or more and 100% or less. Note that the dorsal region B is the same as the ventral region A.

  Further, as shown in FIG. 5 and FIG. 6A, the state in which the diaper 1 is unfolded and extended is viewed in cross section, and with respect to the ventral region A, the low expansion / contraction part 31 </ b> L of the main body side sheet 32 and the outer surface side sheet 31. Of the first joint part 1JT, which is the joint part of the main body side sheet 32 and the high expansion / contraction part 31H of the ventral outer surface side sheet 31A, with respect to the length Y (W5) of the second joint part 2JT which is the joint part of The ratio of the length (W1) in the horizontal direction Y ((W1 / W5) × 100) is preferably 50% or more, more preferably 70% or more, and 200% or less. Preferably, it is 150% or less, more preferably 50% or more and 200% or less, and further preferably 70% or more and 150% or less. Note that the dorsal region B is the same as the ventral region A.

The formation material of each part of the diaper 1 mentioned above is demonstrated.
As the top sheet 21, the back sheet 22, the absorber 23, the leak-proof cuff 24, etc. constituting the absorbent main body 2, various kinds of materials conventionally used for absorbent articles such as disposable diapers are used without particular limitation. Can do. For example, as the surface sheet 21, a single layer or multilayer nonwoven fabric, a perforated film, or the like can be used. As the back sheet 22, a moisture-permeable resin film or the like can be used. As the absorbent body 23, an absorbent core made of an absorbent material composed of absorbent polymer particles and a fiber material and covered with tissue paper can be used. Moreover, as the leak-proof cuff 24, a water-repellent single layer or multilayer nonwoven fabric or the like can be used.

  Examples of the elastic member (leakage-proof cuff forming elastic member 25, waist elastic member 33, leg elastic member 34, etc.) include synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, and stretchable polyolefin. And polyurethane. As the form of the elastic member, a thread-like (thread rubber etc.) having a cross section of a rectangle, a square, a circle, an ellipse, a polygon or the like, or a string-like (flat rubber etc.) can be preferably used.

  As the belt-like adhesive (not shown) for fixing the main body fixing adhesive 4 or the leg elastic member 34, various hot melt adhesives conventionally used for absorbent articles such as disposable diapers are not particularly limited. Can be used. The main body fixing adhesive 4 is applied by using, for example, a coater, one of the non-skin facing surface of the back sheet 22 constituting the absorbent body 2 and the skin facing surface of the body side sheet 32 constituting the exterior body 3. It is coated on.

  The first joining portion 1JT and the second joining portion 2JT of the main body side sheet 32 and the outer surface side sheet 31 are made of various hot melt adhesives conventionally used for absorbent articles such as disposable diapers, for example, using a coater. Can be formed by coating. Moreover, the 1st junction site | part 1JT and the 2nd junction site | part 2JT can be formed using a hot embossing process, an ultrasonic sealing process, a laser processing, etc.

  Examples of the process for forming the side seal portion 5 include hot embossing, ultrasonic sealing, and laser processing.

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 1 described above, as shown in FIGS. 5 and 6, the outer surface side sheet 31 is formed of an elastic sheet having elasticity in the lateral direction (Y direction), and the main body side sheet 32 is not stretched. The main body side sheet 32 is formed of a stretchable sheet having elasticity in the lateral direction (Y direction), and the outer surface side sheet 31 is formed of a non-stretchable sheet. Alternatively, both the main body side sheet 32 and the outer surface side sheet 31 may be formed of an elastic sheet having elasticity in the lateral direction. When the main body side sheet 32 is an elastic sheet, an elastic material having no wrinkles touches the skin, so that it is difficult to make gather marks.

  Moreover, in the diaper 1, although the elastic sheet is distribute | arranged to both the abdominal side expansion-contraction part WA and the back | dorsal side expansion-contraction part WB, an expansion / contraction sheet is provided in any one of the abdominal side expansion / contraction part WA and the back side expansion / contraction part WB. It only has to be arranged.

  Moreover, in the diaper 1, as shown in FIG. 5, in the region 23PT overlapping the absorber 23, the main body side sheet 32 and the high expansion / contraction part 31H of the outer surface side sheet 31 are joined by the first joining part 1JT. Although the side sheet 32 and the low expansion / contraction part 31L of the outer surface side sheet 31 are not joined at the first non-joining part 1NJT, not only the joining of the main body side sheet 32 and the high expansion / contraction part 31H of the outer surface side sheet 31, The main body side sheet 32 and the low expansion / contraction part 31 </ b> L of the outer surface side sheet 31 may be joined. That is, the first non-joining portion 1NJT may not be formed in the region 23PT overlapping the absorber 23.

  Moreover, in the disposable diaper 1 mentioned above, as shown in FIG. 2, the exterior body 3 is a pants-type disposable diaper having a continuous shape such as an hourglass shape extending over the ventral region A, the crotch region C, and the dorsal region B. The exterior body 3 may be a split-type pants-type disposable diaper that is divided as a separate member into a ventral-side exterior body, a back-side exterior body, and a crotch exterior body.

  Moreover, in the disposable diaper 1 mentioned above, as shown in FIG. 1, although it is a pants-type disposable diaper which has the exterior body 3, it may be a deployment-type disposable diaper.

  Moreover, although the absorbent article mentioned above is the underpants type disposable diaper 1 as shown in FIG. 1, the shorts type sanitary napkin for women may be sufficient.

  The following absorbent articles are disclosed regarding the embodiment described above.

<1>
An absorptive body comprising an abdominal region and a dorsal region in the longitudinal direction and an inseam region positioned therebetween, and an absorbent body including an absorbent material across the abdominal region and the dorsal region An absorbent article having a ventral side stretchable part and a back side stretchable part extending laterally in the ventral region and the dorsal region, respectively,
The ventral side stretchable part and the back side stretchable part each have a main body side sheet joined to the absorbent main body, and an outer surface side sheet disposed on the non-skin facing surface of the main body side sheet,
At least one of the main body side sheet and the outer surface side sheet is a stretchable sheet having stretchability in the lateral direction,
In the stretchable sheet, a relatively stretchable high stretchable portion and a relatively stretchable low stretchable portion are alternately arranged in the lateral direction.
The stretchable sheet is disposed on at least one of the abdominal stretchable part and the dorsal stretchable part, and the main body side sheet and the outer surface side sheet are joined at the high stretchable part in a region overlapping the absorber. Forming a first joint portion, and in a region that does not overlap the absorber outside the absorber, the main body side sheet and the outer surface side sheet are joined at the low stretchable portion. The absorbent article which forms the 2nd non-joining site | part which is formed and is not joined by the said high expansion-contraction site | part.

<2>
In the region overlapping with the absorber, the main body side sheet and the outer surface side sheet form a first non-joined part that is not joined at the low stretchable part, and the first non-joined part and the first joint part Are formed continuously in the vertical direction and are alternately arranged in the horizontal direction.
<3>
The absorbent article according to <1> or <2>, wherein in the region overlapping with the absorbent body, the first joint portion is formed over the entire region of the highly stretchable portion.
<4>
The absorbent article according to any one of <1> to <3>, wherein one of the main body side sheet and the outer surface side sheet is the stretchable sheet and the other is a non-stretchable sheet.
<5>
The absorbent article comprises an exterior body that is disposed on the non-skin-facing surface side of the absorbent main body and fixes the absorbent main body,
The exterior body includes the main body side sheet and the outer surface side sheet,
Any one of the above items <1> to <4>, wherein the position of the fixing part between the absorbent main body and the exterior body and the position of the first joint part in the region overlapping with the absorber overlap. Absorbent articles.

<6>
Any one of the above items <1> to <5>, wherein the outer side sheet is a stretchable sheet having stretchability in a lateral direction, and the main body side sheet is a non-stretchable sheet without stretchability. 2. The absorbent article according to 1.
<7>
The outer surface side sheet is configured to include a ventral outer surface side sheet that configures the ventral region, and a back outer surface sheet that configures the back region,
The absorption according to any one of <1> to <6>, wherein the stretchable ventral outer surface sheet and the back outer surface sheet are extendable in the same direction as the direction in which the elastic member extends. Sex goods.
<8>
In the region where the abdominal stretchable portion and the dorsal stretchable portion overlap the absorbent body with the non-stretchable main body side sheet and the stretched outer surface side sheet, respectively. The absorbent article according to any one of <1> to <7>, wherein a bonding site is formed.
<9>
Regarding the folded portion of the waist, in the region that does not overlap the absorber, the folded portion of the main body side sheet and the outer surface side sheet forms the second bonded portion, and the second bonded portion and the main body The absorptivity according to <2>, wherein the side sheet and the second non-joined portion of the folded portion of the outer side sheet are formed continuously in the vertical direction and are alternately arranged in the horizontal direction. Goods.
<10>
In the longitudinal boundary between the region that overlaps the absorber and the region that does not overlap the absorber, the second joint in which the first joint portion and the first non-joint portion that are continuous in the vertical direction are continuous in the vertical direction. The absorbent article according to <9>, wherein the absorbent article is not continuous with the part and the second non-joined part and is divided.
<11>
Regarding the ventral region, the ratio of the lateral length of the region overlapping the absorber ((L _23PT / L _23NT ) × 100) to the sum of the lateral lengths of the regions not overlapping the absorber is 20 % Or more, preferably 30% or more, and 65% or less, preferably 55% or less, the absorbent article according to any one of <1> to <10>.

<12>
With respect to the dorsal region, the ratio of the lateral length of the region overlapping the absorber to the sum of the lateral lengths of the regions not overlapping with the absorber ((L _23PT / L _23NT ) × 100) is 20 % Or more, preferably 30% or more, and 65% or less, preferably 55% or less, the absorbent article according to any one of the above items <1> to <11>.
<13>
The ratio (S _1JT / S) of the total area (S _1JT ) of the area of the first joint portion with respect to the area (S _23PT ) of the area overlapping with the absorber with respect to at least one of the ventral region and the dorsal stretchable portion. _23PT ) × 100) is 25% or more, preferably 35% or more, and 70% or less, preferably 60% or less, according to any one of the above items <1> to <12> Goods.
<14>
High expansion / contraction of the main body side sheet and the outer surface side sheet with respect to a lateral length (W2) of a high expansion / contraction part of the outer surface side sheet with respect to the region overlapping the absorber of the ventral region or the back side expansion / contraction part. It is preferable that the ratio ((W1 / W2) × 100) of the length (W1) in the lateral direction of the first bonding site that is a bonding site with the site is 60% or more, 80% or more, and The absorbent article according to any one of <1> to <13>, which is 150% or less, preferably 120% or less.
<15>
Regarding the region overlapping the absorber of the ventral region or the back side stretchable portion, the lateral length of the first joint portion (W3) with respect to the lateral length (W3) of the low stretchable portion of the outer surface side sheet ( The ratio of (W1) ((W1 / W3) × 100) is 50% or more, preferably 70% or more, and 140% or less, preferably 120% or less. The absorbent article of any one.

<16>
Regarding the region overlapping the absorber of the ventral region or the dorsal stretchable part, the lateral length (W4) of the body fixing adhesive that is a fixing part of the absorbent main body and the exterior body, The ratio ((W2 / W4) × 100) of the length (W2) in the lateral direction of the highly stretchable part of the outer sheet is 60% or more, preferably 80% or more, and 150% or less, preferably 120 % Or less, the absorbent article according to <5>.
<17>
At least with respect to one of the ventral region and the dorsal stretch unit, the relative area of the region which does not overlap with the absorbent body (S _{23 nt),} the proportion of total area of the second joint zones _{(S 2JT) ((S 2JT} / S _23NT ) × 100) is 20% or more, preferably 35% or more, and 75% or less, preferably 65% or less, according to any one of <1> to <16> above Sex goods.
<18>
The ratio (S _2NJT / S _23NT ) of the total area (S _2NJT ) of the second non-joined part to the area (S _23NT ) of the region that does not overlap the absorber of the ventral stretch part or the back stretch part ) × 100) is 25% or more, preferably 35% or more, and 80% or less, preferably 65% or less. The absorbent article according to any one of the above items <1> to <17> .
<19>
Relates area where the not overlapping the absorber of the ventral telescopic portion or the back side elastic part, to the sum of the areas of the second joint zones (S _2JT), total area of the second non-joint zone (S _2NJT) The ratio ((S _2NJT / S _2JT ) × 100) is 100% or more, preferably 200% or more, and 1000% or less, preferably 800% or less. The absorbent article of any one.
<20>
Regarding the region of the ventral region or the dorsal stretchable portion that does not overlap with the absorber, the lateral length of the second joint portion with respect to the lateral length (W2) of the highly stretchable portion of the outer sheet. The ratio of (W5) ((W5 / W2) × 100) is 50% or more, preferably 70% or more, and 150% or less, preferably 100% or less, <1> to <19> The absorbent article according to any one of 1.
<21>
Regarding the region that does not overlap the absorber of the ventral region or the back side stretchable portion, the lateral length of the second joint portion with respect to the lateral length (W3) of the low stretchable portion of the outer sheet. The ratio of (W5) ((W5 / W3) × 100) is 40% or more, preferably 70% or more, and 140% or less, preferably 100% or less, <1> to <20> The absorbent article according to any one of 1.
<22>
The ratio ((W1) of the lateral length (W1) of the first joint part to the lateral length (W5) of the second joint part with respect to at least one of the ventral region and the dorsal stretchable part. / W5) × 100) is 50% or more, preferably 70% or more, and 200% or less, preferably 150% or less, the absorption according to any one of the above items <1> to <21> Sex goods.

<23>
Of the three ventral outer surface sheets, the dorsal outer surface sheet, and the crotch outer surface sheet constituting the outer surface sheet, the abdominal outer surface sheet and the dorsal outer surface sheet have a laterally stretchable property. And the said crotch outer surface side sheet | seat is an absorptive article in any one of said <1>-<22> which does not have a stretching property but is non-stretching.
<24>
The ventral outer surface side sheet and the back outer surface side sheet have a configuration in which a thread-like elastic filament is bonded to one surface of an extensible fiber layer mainly composed of non-elastic fibers. The absorbent article according to <23>, including a fiber sheet and an elastic member as the elastic filament interposed between both sheets.
<25>
The absorbent article according to <24>, wherein the plurality of elastic members are arranged to extend in one direction (lateral direction) without crossing each other.
<26>
The absorbent article according to <24> or <25>, wherein the elastic member is bonded to the two fiber sheets in a substantially non-extended state.
<27>
Any one of the above <24> to <26>, wherein no adhesive is present between the fiber sheet (extensible fiber layer mainly composed of non-elastic fibers) and the elastic member bonded thereto. Absorbent article as described in 1.
<28>
With respect to each of the high stretchable part and the low stretchable part, the length in the extending direction of the elastic member is 100% when contracted, and the lateral length of the high stretchable part is the low stretchable part. On the premise that it is longer than the length in the lateral direction, the high stretch portion is 130% or more, preferably 300% or more, the upper limit is 600% or less, and the low stretch portion is The absorbent article according to any one of <24> to <27>, wherein the absorbent article is 200% or less, preferably 170% or less, and a lower limit value is 100% or more.

1 Pants-type disposable diaper (absorbent article)
WA Abdominal stretchable part WB Dorsal stretchable part 2 Absorbent body 21 Top sheet 22 Back sheet 23 Absorber 23PT Area overlapping the absorber 23NT Area not overlapping the absorber 24 Leakage cuff 25 Elastic member 3 for leakproof cuff formation Exterior Body 31 Outer surface side sheet 31A Abdominal side outer surface sheet 31AE Abdominal side extension part 31B Back side outer surface side sheet 31BE Back side extension part 31C Inseam outer surface side sheet 31H High expansion / contraction part 31L Low expansion / contraction part 32 Main body side sheet 33 Waist elastic member 34 Leg elastic member 4 Main body fixing adhesive 1JT First joint part 2JT Second joint part 1NJT First non-joint part 2NJT Second non-joint part A Ventral region, B Dorsal region, C Inseam region

Claims (7)

An absorptive body comprising an abdominal region and a dorsal region in the longitudinal direction and an inseam region positioned therebetween, and an absorbent body including an absorbent material across the abdominal region and the dorsal region An absorbent article having a ventral side stretchable part and a back side stretchable part extending laterally in the ventral region and the dorsal region, respectively,
The ventral side stretchable part and the back side stretchable part each have a main body side sheet joined to the absorbent main body, and an outer surface side sheet disposed on the non-skin facing surface of the main body side sheet,
At least one of the main body side sheet and the outer surface side sheet is a stretchable sheet having stretchability in the lateral direction,
In the stretchable sheet, a relatively stretchable high stretchable portion and a relatively stretchable low stretchable portion are alternately arranged in the lateral direction.
The stretchable sheet is disposed on at least one of the abdominal stretchable part and the dorsal stretchable part, and the main body side sheet and the outer surface side sheet are joined at the high stretchable part in a region overlapping the absorber. Forming a first joint portion, and in a region that does not overlap the absorber outside the absorber, the main body side sheet and the outer surface side sheet are joined at the low stretchable portion. The absorbent article which forms the 2nd non-joining site | part which is formed and is not joined by the said high expansion-contraction site | part.   In the region overlapping with the absorber, the main body side sheet and the outer surface side sheet form a first non-joined part that is not joined at the low stretchable part, and the first non-joined part and the first joint part The absorbent article according to claim 1, which is continuously formed in the vertical direction and is alternately arranged in the horizontal direction.   The absorbent article according to claim 1 or 2, wherein in the region overlapping with the absorbent body, the first joint portion is formed in the entire region of the highly stretchable portion.   The absorbent article according to any one of claims 1 to 3, wherein one of the main body side sheet and the outer surface side sheet is the stretchable sheet and the other is a non-stretchable sheet. The absorbent article comprises an exterior body that is disposed on the non-skin-facing surface side of the absorbent main body and fixes the absorbent main body,
The exterior body includes the main body side sheet and the outer surface side sheet,
The absorption according to any one of claims 1 to 4, wherein a position of a fixing portion between the absorbent main body and the exterior body and a position of the first joint portion in a region overlapping with the absorber are overlapped. Sex goods. The ratio (S _2NJT / S _23NT ) of the total area (S _2NJT ) of the second non-joined part to the area (S _23NT ) of the region that does not overlap the absorber of the ventral stretch part or the back stretch part ) X 100) is an absorbent article according to any one of claims 1 to 5, which is 25% or more and 80% or less. Relates area where the not overlapping the absorber of the ventral telescopic portion or the back side elastic part, to the sum of the areas of the second joint zones (S _2JT), total area of the second non-joint zone (S _2NJT) The ratio ((S _2NJT / S _2JT ) × 100) of the absorbent article according to any one of claims 1 to 6, which is 100% or more and 1000% or less.