JP2018050830A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which suppresses generation of a step caused by thickness difference between an absorbent core and its peripheral part and makes it hard for the third part to know that the absorbent article is worn.SOLUTION: A front end 24a and a rear end 24b in a longitudinal direction X of an absorbent core 24 are present on and below a lower end Sb of a side seal part S. An exterior body 3 has stretchable sheets 31A, 31C, and the whole of both sheets 31A, 31C have stretchability in a horizontal direction Y and are across the longitudinal direction ends 24a, 24b in the longitudinal direction X. At a position farther from the wearer's skin than the absorbent core 24, a stretchable material 13 having stretchability in the longitudinal direction X is arranged in at least a part of the belt areas 10A, 10C composed of a core longitudinal direction end vicinity area 11 near the longitudinal direction ends 24a, 24b and an extension area 12 in the horizontal direction Y of the area 11 in the way that the stretchable material is across the longitudinal direction end 24a or 24b or its virtual extension line 24VL of the absorbent core 24 in the belt area 10A or 10C where the stretchable material 13 is arranged.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  A pants-type disposable diaper typically includes an exterior body and an absorbent main body that is disposed in the center of the exterior body on the skin-facing surface side and includes a liquid-retaining absorbent core. A pair of side seal portions, a waist opening portion, and a pair of leg opening portions are formed by joining the side edge portions along the longitudinal direction of the exterior body in each body. In addition, a thread-like elastic member is arranged in an extended state on portions of the exterior body that are arranged around the waist and legs of the wearer, whereby the waist and legs around the disposable diaper are arranged in the longitudinal direction and / or Alternatively, stretchability is imparted in the lateral direction. For example, FIG. 2 of Patent Document 1 and FIG. 1 of Patent Document 2 include a waistline elastic region in the vicinity region of the longitudinal end of the absorbent core and the extension region when the vicinity region is virtually extended in the lateral direction. The state in which the members and / or elastic members around the legs are arranged is shown. These elastic members described in Patent Documents 1 and 2 are fixed to a sheet constituting the exterior body, and are therefore disposed at a position farther from the wearer's skin than the absorbent core. In addition, a vertical direction is a direction corresponding to a wearer's front-back direction, and a horizontal direction is a direction orthogonal to this vertical direction.

JP2013-223690A JP 2002-159526 A

  A typical absorbent core included in an absorbent article is configured by stacking absorbent materials such as pulp, and the absorbent core made of such a stacked body is predetermined in the absorbent article. In general, the thickness is larger than that of other members from the viewpoint of imparting the liquid absorbing ability. Therefore, for example, as shown in FIG. 8, in a state where the wearer 100 wears the conventional disposable diaper 1 </ b> Z, there is a difference in thickness between the longitudinal front end 24 a of the thick absorbent core 24 and the periphery thereof. The resulting step 40 can occur. In addition, the component shown with various codes | symbols, such as code | symbol 24 in FIG. 8, is substantially the same as the component of the same code | symbol in the diaper 1 which is one Embodiment of the absorbent article of this invention mentioned later, and it does not explain in particular. The description about the diaper 1 mentioned later is applied suitably to a component.

  The step 40 may appear on the outer shape of the garment even if a garment (not shown) such as trousers is worn on the diaper 1 </ b> Z. The presence of 40 can be viewed. Thus, for example, despite the situation in which the wearer of a disposable diaper is an adult and does not want other people to know that they are wearing a disposable diaper, There has been a risk of being known to the three parties. Patent Documents 1 and 2 do not describe such a problem that a third party knows how to wear the absorbent article, and naturally do not describe means for solving the problem.

  Therefore, the subject of this invention is related with providing the absorbent article which suppresses generation | occurrence | production of the level | step difference resulting from the thickness difference of an absorptive core and its periphery, and is hard to be known to the third party wearing.

The present invention has an absorptive main body having a longitudinal direction corresponding to the wearer's front-rear direction and a transverse direction perpendicular thereto and including a liquid-retaining absorbent core in the laterally central part, and the absorbent main body The outer body disposed on the non-skin facing surface side of the front body and the back body, both side edges along the longitudinal direction of the outer body are joined to each other so that a pair of side seal portions, a waist opening portion, and a pair of An absorbent article in which a leg opening is formed,
The front end and the rear end of the absorbent core in the vertical direction are placed at the same position in the vertical direction with the lower end of the side seal portion, or are positioned inward in the vertical direction from the lower end,
The exterior body has a stretchable sheet, and the stretchable sheet as a whole has a stretchability in the lateral direction, and is arranged so as to straddle the longitudinal front and rear ends of the absorbent core in the longitudinal direction. ,
A region in the vicinity of the front end of the core in the longitudinal direction extending from the front end in the longitudinal direction of the absorbent core to a position separated by a predetermined distance inward and outward in the longitudinal direction, The region that is formed of an extension region and crosses the absorbent article in the lateral direction is a front side belt-like region, and extends from the longitudinal rear end of the absorbent core to the longitudinally inner and outer sides by a predetermined distance. A region in the vicinity of the longitudinal rear end of the core, and an extension region in the case where the region in the vicinity of the longitudinal rear end of the core is virtually extended in the lateral direction. In the case of the belt-like region, at least a part of both belt-like regions is provided with a stretchable material having stretchability in the vertical direction at a position farther from the wearer's skin than the absorbent core. In the band There is provided a longitudinal end or absorbent articles are arranged so as to straddle the imaginary extension of the absorbent core.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which suppresses generation | occurrence | production of the level | step difference resulting from the thickness difference of an absorptive core and its peripheral part, and is hard to be known to the third party wearing is provided.

FIG. 1 is a perspective view schematically showing an example of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin facing surface side in the developed and extended state of the diaper shown in FIG. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 4 is an exploded perspective view schematically showing the diaper shown in FIG. 1 in an exploded manner. 5 is a vertical cross-sectional view schematically showing a part of the cross section taken along the line II-II of FIG. 2 in the wearing state of the diaper shown in FIG. FIG. 6 is a perspective view schematically showing a partially broken example of the stretchable sheet according to the present invention. FIG. 7 is a perspective view schematically showing an apparatus suitably used for manufacturing the stretchable sheet shown in FIG. FIG. 8 is a schematic vertical cross-sectional view of a portion disposed on the abdomen side of the wearer in a state where the conventional disposable diaper is worn, that is, FIG.

  The present invention will be described below based on preferred embodiments with reference to the drawings. 1 to 4 show a basic configuration of a diaper 1 that is an example of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. The diaper 1 has a longitudinal direction X corresponding to the longitudinal direction of the wearer and a lateral direction Y perpendicular to the longitudinal direction X, and a crotch part B and a ventral side part A extending in the longitudinal direction X from the front and back of the crotch part B. In addition, the crotch part B is provided with an absorbent body 23 (absorbent core 24) having a back side portion C and having liquid retention. The crotch part B is a part arranged in the crotch part of the wearer when the diaper 1 is worn, and the abdomen part A is the abdomen side of the wearer, that is, the longitudinal direction X rather than the crotch part B when the diaper 1 is worn. The back side portion C is a portion disposed on the back side of the wearer, that is, on the rear side in the longitudinal direction X, with respect to the crotch portion B in the wearing state of the diaper 1.

  The diaper 1 is provided with an absorbent main body 2 including an absorbent body 23 at the center in the lateral direction Y, and the non-skin facing surface side of the absorbent main body 2, that is, the side farther from the wearer's body than the absorbent main body 2. The side edges AS and CS along the longitudinal direction X of the exterior body 3 in the abdominal side A (front body F) and the back side C (rear body R) are bonded to each other. Waist opening WH through which a pair of side seal portions S, S and a wearer's torso are passed, as shown in FIG. 1, joined together by known joining means such as an agent, heat seal, ultrasonic seal, etc. And a pair of leg opening part LH and LH through which a wearer's leg is passed are formed.

  As shown in FIG. 2, the diaper 1 is a forerunner that covers the front side (abdominal side) of the wearer's body in the wearing state with the diaper 1 divided into the vertical direction X and the vertical center line CLx extending in the horizontal direction Y as a reference. It is divided into the back F and the back R which covers the back side (back side) of the wearer's body in the wearing state. The abdominal side A is a part of the front body F, the back side C is a part of the back body R, and the crotch B extends over the front body F and the back body R. The abdominal side part A and the back side part C are parts that are in the same position as the side seal part S in the longitudinal direction X, and are arranged around the waist including the wearer's waist part when the diaper 1 is worn. The crotch part B is a region in which recesses for forming the leg openings LH and LH are formed at both side edges along the longitudinal direction X of the exterior body 3.

  The absorptive main body 2 has a rectangular shape in plan view when the diaper 1 is expanded and stretched as shown in FIG. 2, and extends in the longitudinal direction X from the ventral side A to the dorsal side C. Is aligned with the longitudinal direction X of the diaper 1 in the unfolded and extended state, and is arranged at the central portion in the lateral direction Y of the exterior body 3 and joined to the exterior body 3 with an adhesive. The “expanded and extended state” of the diaper 1 means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the expanded diaper 1 is stretched by the elastic member of each part to design dimensions (the influence of the elastic member is not at all). It means a state in which it is expanded until it becomes the same size as when it is expanded in a flat state in the excluded state.

  As shown in FIG. 3, the absorbent main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, and a liquid-impermeable or liquid-permeable or water-repellent back sheet 22 that forms a non-skin-facing surface. And a liquid-retaining absorbent 23 interposed between the two sheets 21 and 22, which are integrated by a known joining means such as an adhesive. The absorbent body 23 includes a liquid-retaining absorbent core 24 and a core wrap sheet 25 that covers the outer surface of the absorbent core 24 (both skin facing surface and non-skin facing surface). The absorbent core 24 and the core wrap sheet 25 are joined by a known joining means such as a hot-melt adhesive.

  In this specification, the “skin-opposing surface” is a surface of the absorbent article or a component thereof (for example, an absorbent core) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. It is the side close to the skin, and the “non-skin facing surface” is the surface of the absorbent article or its component that is directed to the side opposite to the skin side when the absorbent article is worn, that is, relatively from the wearer's skin. On the far side. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

  The absorptive core 24 has a flat single-layer structure, has a substantially hourglass shape in a plan view as shown in FIG. 2, and has the narrowest width portion (in the hourglass shape in a plan view) having the shortest length in the lateral direction Y. The constricted part) is located in the crotch part B. As shown in FIG. 2, the absorbent core 24 includes a narrow-width portion, that is, a constricted portion, a core front portion positioned on the front side in the longitudinal direction X with respect to the constricted portion, and a rear portion in the longitudinal direction X with respect to the constricted portion. The core rear portion and the core rear portion have the same length in the vertical direction X, and the core rear portion has a length in the vertical direction X. Is long.

  In the diaper 1, as shown in FIGS. 1 and 2, both longitudinal ends of the absorbent core 24, that is, the front end 24 a and the rear end 24 b in the longitudinal direction X are the same in the longitudinal direction X with the lower end Sb of the side seal portion S, respectively. It is located at the position or below the lower end Sb, that is, inward in the longitudinal direction X, that is, closer to the longitudinal center line CLx. In other words, the absorbent core 24 in the diaper 1 is a side of the side edge AS and the back side C of the abdominal side A in the exterior body 3 in a plan view of the expanded and expanded state of the diaper 1 as shown in FIG. It is arranged only in the crotch part B, which is a region sandwiched between the edges CS, and is not arranged in the ventral part A and the dorsal part C located in the longitudinal direction X of the crotch part B. The total length of the absorbent core 24 in the vertical direction X is shorter than the total length of the crotch part B in the vertical direction X.

  In this type of absorbent article, the absorbent core 24 usually extends from the ventral side A to the back side C via the crotch B, so the absorbent core 24 that the diaper 1 has is the crotch B. It can be said that the configuration that is contained within is a characteristic configuration that is not found in conventional products. In the diaper 1, the length in the longitudinal direction X of the abdominal part A and the dorsal part C is made shorter than that of the conventional product along with the use of the absorbent core 24 having a relatively short longitudinal length. In the plan view of the developed and extended state as shown in FIG. 2, the overall length of the diaper 1 in the longitudinal direction X is shorter than that of the conventional product. When the diaper 1 having such a configuration is worn and clothing such as trousers is further worn thereon, the waist portion of the diaper 1 is usually lower than the waist portion of the clothing. The waist part of the diaper 1 is difficult to protrude, so that it is difficult for others to know that the diaper is worn. The diaper 1 having such an effect is particularly useful as a disposable diaper for adults or nursing care.

  As shown in FIG. 2, the core wrap sheet 25 that covers the outer surface of the absorbent core 24 is longer in the longitudinal direction X than the absorbent core 24, and the longitudinal front and rear ends 24 a of the absorbent core 24 in the longitudinal direction X. 24b has an extending portion 25E extending outward in the longitudinal direction X, and the extending portion 25E is arranged on the abdominal side A and the back side C. That is, the extending portion 25E of the core wrap sheet 25 is located at the same position in the longitudinal direction X with the side seal portion S on both the front side and the rear side in the longitudinal direction X. The core wrap sheet 25 may be a single continuous sheet having a size capable of covering the entire outer surface of the absorbent core 24, or a sheet of skin that covers the skin-facing surface of the absorbent core 24. You may be comprised from the non-skin side core wrap sheet | seat which covers a side core wrap sheet | seat and a non-skin opposing surface.

  Similarly to the core wrap sheet 25, the top sheet 21 and the back sheet 22 are longer in the longitudinal direction X than the absorbent core 24, and as shown in FIG. 2, the front and rear ends 24 a in the longitudinal direction X of the absorbent core 24. 24b, extending portions 21E and 22E extending outward in the longitudinal direction X, and the extending portions 21E and 22E are arranged on the ventral portion A and the dorsal portion C, respectively. That is, each of the extending part 21E of the top sheet 21 and the extending part 22E of the back sheet 22 is located at the same position in the longitudinal direction X with the side seal part S on both the front side and the rear side in the longitudinal direction X. In the present embodiment, the positions of the front and rear ends in the longitudinal direction X of the top sheet 21 and the back sheet 22 are the same as the positions of the front and rear ends in the longitudinal direction X of the core wrap sheet 25.

  As the absorbent core 24 and the core wrap sheet 25 constituting the topsheet 21, the backsheet 22 and the absorber 23, various types conventionally used for this kind of absorbent article can be used without any particular limitation. it can. For example, various nonwoven fabrics or apertured films can be used as the top sheet 21, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 22. The absorbent core 24 is a deposit of core-forming material that includes an absorbent material. As the absorbent material, those normally used as a material for forming this type of absorbent core can be used without any particular limitation. For example, hydrophilic fibers such as wood pulp, synthetic fibers treated with a hydrophilizing agent, and water absorption Include polymer particles. In other words, the absorbent core 24 can be a hydrophilic fiber stack, or a structure in which water-absorbing polymer particles are supported on the stack. As the core wrap sheet 25, a liquid permeable sheet such as paper or nonwoven fabric can be used.

  As shown in FIGS. 2 and 3, the left and right side portions along the longitudinal direction X of the skin-facing surface of the absorbent main body 2 are provided with a pair of liquid-resistant or water-repellent and breathable sheet materials. Leakage cuffs 26, 26 are provided. In the vicinity of the free end portion of each leak-proof cuff 26, one or more thread-like leak-proof cuff forming elastic members 27 are arranged in an elongated state in the longitudinal direction X. The leak-proof cuff 26 stands up at least at the crotch B when the elastic member 27 arranged in the stretched state contracts when the diaper 1 is worn, and thereby the outflow of excretion fluid such as urine outward in the lateral direction Y. To prevent.

  The outer package 3 forms the outer shape of the unfolded and extended diaper 1 as shown in FIG. 2, and the outer periphery of the outer package 3 has contour lines of the diaper 1 in that state, that is, the ventral side A, the crotch B and A contour line of each of the back side portions C is formed. As shown in FIG. 2, the exterior body 3 has a rectangular shape in which the length in the lateral direction Y is longer than the longitudinal direction X in the abdominal side A and the back side C. In the crotch part B located between C and C, both side edges along the longitudinal direction X of the outer package 3, that is, the pair of leg edge parts LS, LS are curved in a convex arc shape toward the center in the lateral direction Y. In the plan view as shown in FIG. 2, the central area in the vertical direction X forms an hourglass shape that is bound inward in the horizontal direction Y.

  As shown in FIGS. 3 and 4, the outer package 3 includes an outer layer sheet 31 that forms an outer surface of the diaper 1 in a worn state, that is, a non-skin facing surface, and an inner layer sheet 32 that is disposed to face the skin facing surface of the outer layer sheet 31. It is comprised including the laminated body. In the wearing state of the diaper 1, the outer layer 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 inner layer sheet 32 is positioned on the side closer to the wearer's body. And the skin opposing surface (inner surface) of the diaper 1 is formed. The outer layer sheet 31 and the inner layer sheet 32 are bonded to each other through a bonding means such as an adhesive at a predetermined portion. As shown in FIG. 4, the outer layer sheet 31 has a portion 31E extending from the edge in the longitudinal direction X of the inner layer sheet 32 on the ventral side A and the back side C, and the extending portion 31E As shown in FIG. 2, the inner layer sheet 32 is folded back to the skin facing surface side and covers the end portion in the longitudinal direction X of the absorbent main body 2.

  In the present embodiment, as shown in FIG. 4, the inner layer sheet 32 is composed of a single continuous sheet, whereas the outer layer sheet 31 is composed of a combination of a plurality of sheets. Specifically, a ventral outer layer sheet 31A constituting the ventral part A, a dorsal outer layer sheet 31C constituting the dorsal part C, and a crotch outer layer constituting the crotch part B located between the sheets 31A and 31C. A sheet 31B is included. Each of the sheets 31A, 31B, 31C constituting the outer layer sheet 31 is overlapped with each other in the longitudinal direction X, and a known joining such as an adhesive, a heat seal, a high frequency seal, an ultrasonic seal, etc. They are joined and integrated by 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.

  The exterior body 3 has an elastic sheet, and the entire elastic sheet has elasticity in the lateral direction Y. As shown in FIG. 2, the front end 24a and the rear end 24b in the longitudinal direction X of the absorbent core 24 are provided. They are arranged so as to straddle the vertical direction X. The term “stretchability” as used herein means a property that can be extended in a predetermined direction and contracts when the extension is released. In the present embodiment, members corresponding to the stretchable sheet are the ventral outer layer sheet 31A and the back outer layer sheet 31C. The ventral outer layer sheet 31 </ b> A is disposed in the entire region of the ventral side A and in the crotch B near the ventral side A, and straddles the longitudinal front end 24 a of the absorbent core 24 in the vertical direction X. The back side outer layer sheet 31 </ b> C is disposed in the entire region of the back side portion C and the portion near the back side portion C in the crotch portion B, and straddles the longitudinal rear end 24 b of the absorbent core 24 in the longitudinal direction X.

  In the present embodiment, the ventral outer layer sheet 31A and the back outer layer sheet 31C have stretchability, whereas the crotch outer layer sheet 31B and the inner layer sheet 32 have no stretchability and are not stretchable. is there. The non-stretchable sheets 31B and 32 preferably do not have stretchability in the vertical direction X or the horizontal direction Y, and preferably do not have stretchability in both the directions X and Y. In the exterior body 3, the outer layer sheet 31 in which only a part (the abdominal part A and the back part C) is stretchable and the inner layer sheet 32 that is not stretchable as a whole are parts having the stretchability of the outer layer sheet 31 ( Under the stretched state of the ventral outer layer sheet 31A and the dorsal outer layer sheet 31C), they are bonded to each other on the opposing surfaces. Therefore, the outer package 3 as a whole is provided with the ventral outer layer sheet 31A and the dorsal outer layer sheet 31C. The ventral portion A and the dorsal side portion C are stretchable at least in the stretchable direction (lateral direction Y) of both sheets 31A and 31C, and the other portion (the crotch portion B) is stretchable. Not.

  The fact that the sheet is not substantially stretchable in a certain direction (non-stretchable) means that the sheet hardly stretches even when a pulling force is applied to the sheet in the certain direction. To do. For example, when a sample having a length of 15 × width of 5 cm is pulled in a longitudinal direction by a material tensile tester such as Tensilon and the breaking elongation when the sample breaks is 10% or less, The sample is not substantially stretchable in the longitudinal direction. The elongation at break can be calculated by (the sample length at break−the original length of the sample) / (the original length of the sample) × 100.

  As an expandable sheet that can be used as the exterior body 3 (the ventral outer layer sheet 31A and the back outer layer sheet 31C in the present embodiment), for example, stretchable fiber layers are integrated on both sides or one side of the elastic fiber layer. Examples of the method for integrating the elastic fiber layer and the extensible fiber layer include, for example, a method of laminating both layers and hydroentanglement, a method of entangling fibers by air-through, heat embossing, an adhesive, and the like The method of joining by ultrasonic waves etc. is mentioned. A preferred specific example of the stretchable sheet will be described later.

  In addition, as the stretchable sheet that can be used as the exterior body 3 (in this embodiment, the crotch outer layer sheet 31B and the inner layer sheet 32), nonwoven fabrics produced by various manufacturing methods are preferably used. For example, spunbond nonwoven fabrics, air-through nonwoven fabrics, and needle punched nonwoven fabrics. It can be illustrated. As a constituent fiber of the nonwoven fabric used as the non-stretchable sheets 31B and 32, for example, a fiber made of polyester such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide, or the like Etc. The fibers constituting the nonwoven fabric used as the non-stretchable sheets 31B and 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.

  The exterior body 3 includes a waist elastic member 33 that forms a waist gather at the opening edge of the waist opening WH. That is, one or a plurality (in the present embodiment, a plurality) of yarn-like or belt-like waist gathers are formed at and near the opening edge of the waist opening WH in each of the ventral side A and the back side C. The waist elastic member 33 is arranged in an extended state over the entire length in the lateral direction Y, whereby an annular waist gather substantially continuous over the entire circumference is formed at the opening edge and in the vicinity thereof. The waist elastic member 33 is sandwiched and fixed by an adhesive between the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3.

  Moreover, the exterior body 3 is a leg elastic member that forms leg gathers at the opening edge of each of the pair of leg openings LH, LH, and is one or a plurality (in this embodiment) arranged in an extended state on the front body F A plurality of thread-like or belt-like front leg elastic members 34, and one or a plurality (in the present embodiment, a plurality of) thread-like or belt-like rear leg elastic members 35 arranged in an extended state on the back body R It has.

  As shown in FIGS. 2 and 4, the front leg elastic member 34 extends from the both side edges AS, AS (side seal part S) of the outer body 3 in the front body F (abdominal side part A) to the leg edge part LS. And extends inward in the longitudinal direction X and inward in the lateral direction Y to reach the side edge 2S along the longitudinal direction X of the absorbent main body 2, and further extends inward in the lateral direction Y from the side edge 2S. The end of the elastic member 34 opposite to the side edge AS side is located in the region where the absorbent main body 2 is disposed. The front leg elastic member 34 starting from one of the side edges AS, AS of the outer body 3 in the front body F is not connected to the front leg elastic member 34 starting from the other, and the absorbent main body 2 Between the elastic members 34 and 34 existing in the arrangement region, the elastic stretchability by the elastic member does not appear. The front leg elastic member 34 starting from the one side edge AS and the front leg elastic member 34 starting from the other side edge AS are a horizontal center line CLy extending in the vertical direction by dividing the diaper 1 into the horizontal direction Y. It is arranged symmetrically with respect to.

  As shown in FIGS. 2 and 4, the rear leg elastic member 35 has leg edge portions LS from both side edges CS and CS (side seal portions S) of the exterior body 3 in the back body R (back side portion C). Extends inward in the longitudinal direction X and inward in the lateral direction Y to reach the side edge 2S along the longitudinal direction X of the absorbent main body 2, and further extends inward in the lateral direction Y from the side edge 2S. The end of the elastic member 35 opposite to the side edge CS side is located in the arrangement region of the absorbent main body 2. The rear leg elastic member 35 starting from one of the side edges CS, CS of the exterior body 3 in the back body R is not connected to the rear leg elastic member 35 starting from the other, and is absorbent. Between the elastic members 35, 35 existing in the arrangement region of the main body 2, the elastic stretchability by the elastic member is not expressed. The rear leg elastic member 35 starting from the one side edge CS and the rear leg elastic member 35 starting from the other edge CS are arranged symmetrically with respect to the horizontal center line CLy.

  As one of the main features of the diaper 1, as shown in FIG. 2, an elastic material 13 having elasticity in the vertical direction X is formed on at least a part of the belt-like regions 10 </ b> A and 10 </ b> C crossing the diaper 1 in the horizontal direction Y. At a position farther from the wearer's skin than the absorbent core 24, the longitudinal end (front end 24a) of the absorbent core 24 in the belt-like region (the front belt-like region 10A or the rear belt-like region 10C) where the stretchable material 13 is disposed. Or the point arrange | positioned so that the rear end 24b) or its virtual extension line 24VL may be straddled. That is, in the diaper 1, the front end 24 a in the longitudinal direction X of the absorbent core 24 extends parallel to the lateral direction Y in the front belt-like region 10 </ b> A, whereas the stretchable material 13 (front leg elastic member 34) The virtual extension line 24 </ b> VL that extends in a direction intersecting the two directions of the direction X and the horizontal direction Y and extends in the horizontal direction Y of the front end 24 a of the absorbent core 24 is straddled in the vertical direction X. Further, in the rear belt-like region 10C, the rear end 24b of the absorbent core 24 in the longitudinal direction X extends in parallel to the lateral direction Y, whereas the stretchable material 13 (rear leg elastic member 35) is longitudinal. The virtual extension line 24VL extending in the direction intersecting the X and the lateral direction Y and extending in the lateral direction Y of the rear end 24b of the absorbent core 24 is straddled in the longitudinal direction X. The elastic material 13 in the diaper 1 is not orthogonal to the virtual extension line 24VL of the longitudinal end (front end 24a or rear end 24b) of the absorbent core 24 in the belt-like region 10A or 10C where the elastic material 13 is disposed. However, they may be orthogonal to each other.

  10 A of front side strip | belt-shaped area | regions are distribute | arranged so that the front end 24a of the vertical direction X of the absorptive core 24 may be straddled, and predetermined distance (preferably 10-60 mm from the front end 24a of the vertical direction X to each inside / outside of the vertical direction X, respectively. More preferably, it is composed of a core vertical direction end vicinity region 11 extending over a separated position, and an extension region 12 when the region 11 is virtually extended in the horizontal direction Y. 10 C of back side strip | belt-shaped area | regions are distribute | arranged so that the rear end 24b of the vertical direction X of the absorptive core 24 may be straddled, and it is predetermined distance (preferably 10 each) inside and outside of the vertical direction X from the rear end 24b of the vertical direction X (About 60 mm, more preferably 20 to 50 mm) a core vertical direction end vicinity region 11 extending over a spaced position, and an extension region 12 when the region 11 is virtually extended in the horizontal direction Y.

  In the present embodiment, the elastic material 13 in the front belt-like region 10A is a front leg elastic member 34, and the elastic material 13 in the rear belt-like region 10C is a rear leg elastic member 35. That is, in this embodiment, the arrangement | positioning site | part of the elastic material 13 in strip | belt-shaped area | region 10A, 10C is the outward of the horizontal direction Y of the absorptive core 24 (absorbent main body 2), More specifically, a leg opening part The opening edge of LH, that is, the leg edge LS and its vicinity (preferably within 30 m from the leg edge LS). Further, these elastic materials 13, that is, both leg elastic members 34 and 35, are arranged on the non-skin facing surface side of the absorbent core 24. Further, as shown in FIG. 2, these elastic materials 13 extend not only in the vertical direction X but also in the horizontal direction Y due to extending in the direction intersecting both the vertical direction X and the horizontal direction Y. Has elasticity.

  The diaper 1 of the present embodiment has the above-described characteristic configuration, so that the thickness difference between the absorbent core 24 and its peripheral portion as seen in the wearing state of the conventional disposable diaper 1Z as shown in FIG. Occurrence of the step 40 due to the above is suppressed. That is, in the diaper 1, the thickness difference between the absorbent core 24 and the peripheral portion thereof is the same as that of the conventional product. Therefore, the level difference caused by the thickness difference is present at the longitudinal front end 24 a position of the absorbent core 24 and its vicinity. However, when the diaper 1 is actually worn, as shown in FIG. 5, such a step does not occur or even if it occurs, the step is hardly noticeable. It is a small thing. Therefore, in the state where the diaper 1 is worn, and when a garment (not shown) such as trousers is further worn on the diaper 1, the inconvenience that the shape of the absorbent core 24 can be visually recognized through the garment is less likely to occur. It is difficult for third parties to know that they are wearing it. In FIG. 5, the core wrap sheet 25 is not shown for easy explanation. Moreover, in FIG. 5, although the wearing condition by the side of the stomach side A of the diaper 1 was shown, the wearing condition similar to that shown in FIG. That is, a step due to the thickness difference between the absorbent core 24 and its peripheral portion does not occur at or near the longitudinal rear end 24b of the absorbent core 24, or even if it occurs, the step is almost conspicuous. There is no small thing.

  In the diaper 1, the abdominal outer layer sheet 31 </ b> A and the back outer layer sheet 31 </ b> C as the elastic sheet, in which the entire sheet is stretchable in the lateral direction Y, as shown in FIG. Since the longitudinal ends 24a and 24b of the conductive core 24, more specifically, the strip-shaped regions 10A and 10C are arranged so as to straddle the longitudinal direction X, the strip-shaped regions 10A and 10C are formed by the outer layer sheets 31A and 31B. As a result, it is pressed against the body side, and as a result, the occurrence of the step is suppressed, or even if the step is generated, it is difficult to appear on the outer shape of the garment worn from above the diaper 1. Further, in the diaper 1, the belt-like regions 10A and 10C are provided with a stretchable material 13 having stretchability in the longitudinal direction X (the front leg elastic member 34 in the belt-like region 10A and the rear leg elastic member 35 in the belt-like region 10B). The stretchable material 13 is the virtual extension line 24VL of the longitudinal end (front end 24a or rear end 24b) of the absorbent core 24 in the band-like region 10A or 10C where the stretchable material 13 is disposed, that is, the step. Therefore, the belt-like regions 10A and 10C are pressed against the body side of the wearer also by the characteristic arrangement form of the stretchable material 13. In this regard, if the stretchable material 13 does not straddle the longitudinal ends 24a and 24b of the absorbent core 24 or its virtual extension line 24VL, it simply extends in a direction intersecting the longitudinal ends 24a and 24b. If it is only, there is a possibility that the effect of pressing the belt-like regions 10A, 10C on the wearer's body side may be insufficient. Furthermore, the stretchable material 13 is disposed at a position farther from the wearer's skin than the absorbent core 24, so that the absorbent core 24 is pressed from the non-skin facing surface side toward the wearer's skin side. Such a point can also contribute to the expression of the effect of suppressing the occurrence of the step. Therefore, according to the diaper 1, the effect of both the stretchable sheets (the abdominal outer layer sheet 31A and the back outer layer sheet 31C) and the stretchable material 13 in the belt-like regions 10A and 10C is combined with the step difference. The effect of suppressing the occurrence of can be expressed more reliably.

  Moreover, in the diaper 1, as shown in FIG.1 and FIG.2, the vertical direction ends 24a and 24b of the absorptive core 24 are mutually placed in the lower end Sb and the vertical direction X of the side seal part S, or this lower end Sb The absorbent core 24 having a large thickness is not disposed on the abdominal part A and the dorsal part C, and this point also contributes to the development of the effect of suppressing the occurrence of the step. Can do.

  The stretchable sheet constituting the abdominal outer layer sheet 31A and the back outer layer sheet 31C, that is, “the stretchable sheet having a stretchability as a whole” is generally used to form a waist gather, for example. Does not include “an elastic material in which a thread-like or belt-like elastic member is bonded to a sheet-like member by an adhesive in an expanded state”. Since the stretchable sheet according to the present invention has stretchability as a whole, it is possible to press the belt-like regions 10A and 10C on the wearer's body as a whole. On the other hand, if the ventral outer layer sheet 31A and the back outer layer sheet 31C are not the stretchable sheet, for example, “a thread-like or belt-like elastic extending in the lateral direction Y between the outer layer sheet 31 and the inner layer sheet 32”. A plurality of members are intermittently disposed in the longitudinal direction X, and the plurality of elastic members are respectively stretched in the lateral direction Y and fixed to both sheets 31 and 32 via an adhesive ”. The elastic core non-arranged portion corresponding to the interval between the two elastic members adjacent to each other in the longitudinal direction X in the composite stretchable material is a portion to be pressed against the wearer's body side. 24 may overlap with the longitudinal ends 24a and 24b or the belt-like regions 10A and 10C. In such a case, the force for pressing such a part against the wearer's body becomes insufficient, and the step There is a possibility that suppressing effect and the like of occurrence is not sufficiently expressed.

  In the present embodiment, the pair of side seal portions S, S, that is, the front side edge portions AS, AS and the rear side edges CS, CS in the longitudinal direction X of the exterior body 3 in the longitudinal direction X of the absorbent core 24. The length L1 (see FIG. 2) in the lateral direction Y up to the side edge 2S along is longer than the lateral length L2 (see FIG. 2) of the absorbent core 24. The lateral length L2 of the absorbent core 24 means the lateral length, that is, the maximum width of the portion having the largest lateral length in the absorbent core 24. In general, when the diaper 1 is worn on the human body, the portion covered with the diaper 1 has a larger curvature on the skin surface in the side regions on both sides than the central region (trunk). When the side edge 2S of the absorbent core 24, which is the boundary between the lateral length L1 and the lateral length L2, is located at a portion corresponding to the lateral region, the thickness of the absorbent core 24 and its peripheral portion There is a possibility that the level difference due to the difference is more emphasized. On the other hand, as in the diaper 1 of the present embodiment, “the lateral length L1 of the exterior body 3 (band-like regions 10A, 10C) in the outer region in the lateral direction Y of the absorbent core 24> the side of the absorbent core 24 Since the magnitude relationship of “direction length L2” is established, the boundary between the lengths L1 and L2, that is, the side edge 2S of the absorbent core 24 is positioned at a portion corresponding to the center of the wearer's body in the diaper 1. Therefore, the effect of suppressing the occurrence of the step can be expressed more reliably.

From the viewpoint of more surely exhibiting the effect of the magnitude relationship of L1> L2, the ratio of L1 to L2 is preferably 1.2 or more, more preferably 1.5 or more, as L1 / L2. And preferably it is 2.5 or less, More preferably, it is 2.0 or less.
Preferably, the lateral length L1 of the outer package 3 (band-like regions 10A, 10C) in the outer region in the lateral direction Y of the absorbent core 24 is larger than the lateral length L2 of the absorbent core 24. Is 190 mm or more, more preferably 210 mm or more, and preferably 300 mm or less, more preferably 270 mm or less.
The lateral length L2 of the absorbent core 24, that is, the maximum width of the absorbent core 24, is preferably 70 mm or more, more preferably 100 mm or more, and preferably 200 mm or less, more preferably, on condition that it is smaller than L1. 180 mm or less.

  By the way, in the state where the diaper 1 is worn and the clothes such as trousers are further worn on the diaper 1, it is only the absorbent core 24 that causes the third party to know the existence of the diaper 1 through the clothing. In addition, the core wrap sheet 25 covering this can also be a factor. That is, in the diaper 1, as shown in FIG. 2, the core wrap sheet 25 extends outward in the longitudinal direction X from the front and rear ends 24 a and 24 b in the longitudinal direction X of the absorbent core 24 to form an extending portion 25 </ b> E. However, when the diaper 1 is worn, a step is generated due to a difference in thickness between the extending portion 25E of the core wrap sheet 25 and its peripheral portion, and the step is worn from above the diaper 1. There is a concern that it will appear in the outer shape of this and viewed by a third party.

  However, in the present embodiment, as shown in FIG. 2, the ventral outer layer sheet 31 </ b> A and the back outer layer sheet 31 </ b> C as the stretchable sheet straddle the extending portion 25 </ b> E of the core wrap sheet 25 in the lateral direction Y. Therefore, the extension 25E is pressed against the body side of the wearer by the outer layer sheets 31A and 31B. As a result, the occurrence of the step is suppressed, or even if the step is generated, It becomes difficult to appear in the outer shape of the clothing worn from above the diaper 1.

  Further, in the present embodiment, as described above, the absorbent core 24 is arranged only in the crotch part B and not in the ventral part A and the dorsal part C, as shown in FIG. As a demerit of such a configuration, the absorbent core 24 hangs down in the wearing state of the diaper 1 and fits as a demerit of such a configuration. There is a concern that the leakage prevention performance and the like may be reduced.

  However, in this embodiment, as shown in FIG. 2, the extending portion 25 </ b> E from the longitudinal ends 24 a and 24 b of the absorbent core 24 of the core wrap sheet 25 that covers the outer surface of the absorbent core 24 is formed vertically. Both the front side in the direction X, that is, the abdominal side portion A and the rear side, that is, the back side portion C, of the side seal portion S, that is, the both side edges AS, AS on the front side in the longitudinal direction X of the exterior body 3 And in the longitudinal direction X, the core wrap sheet 25 is effectively prevented from hanging down in the wearing state of the diaper 1. Therefore, the absorption wrapped in the core wrap sheet 25 is prevented. The hanging of the sex core 24 is also effectively prevented.

From the viewpoint of more surely achieving the above-described effects, it is preferable to set the dimensions and the like of each part of the diaper 1 as follows.
The length in the longitudinal direction X of the absorbent core 24 is preferably 230 mm or more, more preferably 300 mm or more, and preferably 550 mm or less, more preferably 500 mm or less.
In the diaper 1, the lateral length, that is, the minimum width of the portion having the shortest lateral length (the portion that is bound inward in the lateral direction Y in FIG. 2) is preferably 90 mm or more, more preferably 120 mm or more. And preferably it is 320 mm or less, More preferably, it is 290 mm or less.
The length of the diaper 1 in the longitudinal direction X (full product length) is preferably 580 mm or more, more preferably 620 mm or more, and preferably 840 mm or less, more preferably 800 mm or less.
The length in the longitudinal direction X of the ventral part A and the dorsal part C, that is, the length of the side seal part S is preferably 50 mm or more, more preferably 80 mm or more, and preferably 200 mm or less, more preferably 180 mm or less. is there.
The length of the crotch B in the longitudinal direction X, that is, the side edge portion AS of the exterior body 3 of the ventral side A and the side edge CS of the exterior body 3 of the back side C joined by the side seal portion S. The length along the longitudinal direction X between the respective lower ends Sb is preferably 300 mm or more, more preferably 350 mm or more, and preferably 550 mm or less, more preferably 500 mm or less.

  The stretchable material according to the present invention is not limited to the above-described belt-like or thread-like elastic member, and for example, a synthetic resin stretchable film or a composite stretchable material including a sheet-like member and a stretchable material can be used. As a specific example of the latter composite stretchable material, the composite sheet is composed of a composite sheet in which an elastomer (stretchable material) is joined between two non-stretchable nonwoven fabrics (sheet-like members) in an unstretched state with an adhesive. Are stretched along the extending direction of the elastomer.

  FIG. 6 shows a specific example of the stretchable sheet according to the present invention. The stretchable sheet 36 shown in FIG. 6 has a configuration in which a thread-like elastic filament is bonded to one surface of an extensible fiber layer mainly composed of inelastic fibers, and two fiber sheets 37 and 38 as the fiber layers. And an elastic member 39 as the elastic filament disposed between the sheets 37 and 38. The elastic sheet 36 can be suitably used as the abdominal outer layer sheet 31A and the back outer layer sheet 31C constituting the exterior body 3 in the diaper 1 described above.

  The fiber sheets 37 and 38 are both extensible fiber layers mainly composed of inelastic fibers. The content of each non-elastic fiber in the fiber sheets 37 and 38 mainly composed of non-elastic fibers is preferably 90% by mass or more, more preferably 91% by mass or more, and may be 100% by mass.

  The fiber sheets 37 and 38 are both extensible. The fiber sheets 37 and 38 can be extended in the direction in which the elastic filament 39 extends, that is, in the same direction as the lateral direction Y. Stretchable means (i) the case where the constituent fibers themselves of the fiber sheets 37 and 38 are stretched, and (ii) even if the constituent fibers themselves are not stretched, the fibers bonded at the intersections are separated or the fibers are separated from each other. And a case where the three-dimensional structure formed by a plurality of fibers is structurally changed due to bonding or the like, the constituent fibers are broken, and the fiber sheets 37 and 38 are extended as a whole.

  The fiber sheets 37 and 38 may already be stretchable in the state of the original fabric before being joined to the elastic filament 39. Alternatively, it is not stretchable in the state of the original fabric before being joined to the elastic filament 39, but is processed so as to be stretchable after being joined to the elastic filament 39, and becomes stretchable. Also good. Specific methods for making the sheet stretchable include heat treatment, roll-to-roll stretching, bite-and-gap stretching with teeth and gears, and tensile stretching with a tenter. In view of a preferable manufacturing method of the stretchable sheet 36 described later, the fiber sheets 37 and 38 are excellent in terms of transportability of the fiber sheets 37 and 38 when the elastic filament 39 is fused to the fiber sheets 37 and 38. It is preferable that the original fabric is not stretchable.

  The fiber sheets 37 and 38 are extensible and substantially inelastic. Elasticity is a property that can be stretched and contracts when released from the stretched force, and the fiber sheets 37 and 38 do not have such a property. When the fiber sheets 37 and 38 have elasticity, a fiber containing an elastic resin is required as a constituent fiber thereof, and the fiber containing the elastic resin tends to exhibit a sticky feeling that contributes to reducing the texture of the nonwoven fabric. . Therefore, it is preferable to make the fiber sheets 37 and 38 substantially inelastic to prevent a decrease in the texture thereof.

  As will be described later, the elastic filament 39 is formed by being stretched in a state where the elastic resin is melted or softened. Each of the plurality of elastic filaments 39 is substantially continuous over the entire length of the stretchable sheet 36 (the total length in the lateral direction Y of the exterior body 3). The plurality of elastic filaments 39 are arranged so as to extend in one direction (lateral direction Y) without crossing each other. In the present invention, the elastic filaments 39 are allowed to cross unintentionally due to unavoidable fluctuations in the manufacturing conditions of the stretchable sheet 36. The plurality of elastic filaments 39 may each extend linearly or may meander while meandering as long as they do not cross each other.

  The elastic filament 39 is joined to the fiber sheets 37 and 38 in a substantially non-stretched state. Since the elastic filament 39 is not stretched, there is no relaxation (creep) due to stretching, and the elasticity of the elastic filament 39 during storage of the original fabric after being bonded to the fiber sheets 37 and 38, or after processing such as stretching, etc. There is an advantage that there is no decrease. Further, there is no deformation due to the tightness of the wound-up raw material. Further, for example, when the elastic filament 39 is stretched twice and bonded to the fiber sheets 37 and 38, if it temporarily returns to 1.3 times the initial value, it can be stretched only 1.7 times from this state. However, when pasting is performed in a non-stretched state, the initial origin when the stretchable sheet 36 is stretched is different, so that the fiber sheets 37 and 38 can be stretched to the stretchable length or the elastic filament 39 has a maximum elongation. There is an advantage that it can be extended to a maximum.

  The diameter of the elastic filament 39 is not particularly limited, but is preferably 10 μm or more, more preferably 20 μm or more, and preferably 200 μm or less from the viewpoint of the balance between the texture of the stretchable sheet 36 and the productivity of the elastic filament 39. More preferably, it is 130 μm or less.

  The elastic filament 39 may have a circular cross section, but in some cases may have an elliptical cross section. For example, when the elastic sheet 36 is manufactured according to the manufacturing method described later, the cross section of the elastic filament 39 tends to be elliptical. In this case, in the stretchable sheet 36, the elastic filament 39 has an elliptical long axis in the same direction as the plane direction of the stretchable sheet 36 and a short axis in the same direction as the thickness direction of the stretchable sheet 36. Preferably they are arranged.

  The pitch of the adjacent elastic filaments 39 (the distance between the centers of the adjacent elastic filaments) is the diameter of the elastic filament 39 from the viewpoint that the elastic sheet 36 exhibits sufficient stretchability and good cloth-like texture. Is within the above-mentioned range, preferably 0.1 mm or more, more preferably 0.4 mm or more, and preferably 5 mm or less, more preferably 1 mm or less.

  In the stretchable sheet 36, the plurality of elastic filaments 39 are joined to the fiber sheets 37 and 38 over the entire length thereof. Here, “joining over the entire length” means that all the fibers in contact with the elastic filament 39 (component fibers of the fiber sheets 37, 38) are joined with the elastic filament 39. It means that the elastic filament 39 and the constituent fibers (non-elastic fibers) of the fiber sheets 37 and 38 are bonded to the elastic filament 39 in such a manner that there is no intentionally formed non-bonded portion. To do. Since the elastic filament 39 is bonded to the fiber sheets 37 and 38 over their entire length, the bonding force between the elastic filament 39 and the fiber sheets 37 and 38 can be sufficiently increased. As a result, even if the stretchable sheet 36 is stretched, the elastic filament 39 is difficult to peel off from the fiber sheets 37 and 38. When the elastic filament 39 is peeled off from the fiber sheets 37 and 38, floating occurs between the elastic filament 39 and the fiber sheets 37 and 38 in a natural state (relaxed state), and wrinkles are generated in the stretchable sheet 36. It becomes easy and lacks the sense of unity as the whole elastic sheet 36.

  In the stretchable sheet 36, some of the non-elastic fibers included in the fiber sheets 37 and 38 are fused with the elastic filament 39 and buried in the elastic filament 39. The inelastic fibers embedded in the elastic filament 39 may be all or a part of the inelastic fibers existing around the elastic filament 39. The term “buried” as used herein refers to a portion of the inelastic fiber 39 that is present at the intersection at the intersection of the inelastic fiber and the elastic filament 39. The state that has entered inside. Therefore, the state in which the non-elastic fibers and the elastic filaments 39 are joined by dots or lines on their surfaces is not included in the burial according to the present invention. Further, from the viewpoint of improving the bonding strength between the non-elastic fiber and the elastic filament 39, it is preferable that the non-elastic fiber is buried in the elastic filament 39 with a degree of half or more of its diameter.

  The bonding state between the elastic filament 39 and the non-elastic fibers included in the fiber sheets 37 and 38 is as described above, so that the bonding strength between the elastic filament 39 and the fiber sheets 37 and 38 is increased, and the stretchable sheet 36. When the is stretched, peeling between the two is less likely to occur. As a result, when the stretchable sheet 36 is stretched, the fiber sheets 37 and 38 are stretched with good responsiveness following the stretch of the elastic filament 39, so that the stretchable sheet 36 has a favorable stretchability. Played. In addition, since the elastic filament 39 and the non-elastic fibers included in the fiber sheets 37 and 38 are joined as described above, the elastic filament 39 and the fiber sheets 37 and 38 are in close contact with each other. Since it is more difficult to feel the level difference between the portion where there is a portion and the portion where the portion does not exist, there is an advantageous effect that the texture of the stretchable sheet 36 is improved.

  The above-described embedded state of the non-elastic fiber in the elastic filament 39 can be seen in the exterior body 3 (expandable sheet 36) where the sealing process is not performed, but the sealing process such as the side seal portion S is performed. It is not always seen in the applied part. Here, the sealing process is a process involving melting of the forming material (resin) of the exterior body 3, and examples thereof include a heat and pressure process such as an embossing process, an ultrasonic sealing process, and a laser beam irradiation process. . When the sealing process is performed, a change occurs in the buried state of the inelastic fiber in the elastic filament 39, which originally existed, and the buried state may disappear. Therefore, confirmation of whether or not the inelastic fiber is buried in the elastic filament 39 should be performed at a portion of the exterior body 3 where the sealing process is not performed.

  When the stretchable sheet 36 is manufactured according to the manufacturing method described later, a “state in which the non-elastic fibers are fused with the elastic filaments 39 and buried in the elastic filaments 39” is obtained. According to the manufacturing method described later, heat is not applied to the fiber sheets 37 and 38, and the elastic filaments 39 are fused to the fiber sheets 37 and 38 before the elastic filaments 39 obtained by melt spinning are solidified. Only the fibers present around the elastic filament 39 are bonded to the elastic filament 39, and the fibers located further away from the elastic filament 39 maintain the texture of the fiber sheets 37, 38. There is an advantage that the texture of is kept good.

  As described above, the elastic filament 39 in the stretchable sheet 36 is joined to the fiber sheets 37 and 38 in a state where the fibers (non-elastic fibers) constituting the fiber sheets 37 and 38 are buried in the elastic filament 39. It was made by fusing to a sheet, and was not made using an adhesive such as a hot melt adhesive. Therefore, there is no adhesive between the fiber sheets 37 and 38 (extensible fiber layers mainly composed of non-elastic fibers) and the elastic filaments 39 bonded thereto.

  The stretchable sheet 36 can be stretched in the same direction as the direction in which the elastic filament 39 extends (lateral direction Y). The stretchability of the stretchable sheet 36 is manifested due to the elasticity of the elastic filament 39. When the elastic sheet 36 is stretched in the same direction as the direction in which the elastic filament 39 extends, the elastic filament 39 and the fiber sheets 37 and 38 extend. When the stretching of the stretchable sheet 36 is released, the elastic filament 39 contracts, and the fiber sheets 37 and 38 return to the state before stretching with the contraction. Further, in the stretchable sheet 36, there is no other elastic filament bonded in a state orthogonal to the elastic filament 39, so the stretchable sheet 36 is in the same direction as the direction in which the elastic filament 39 extends (lateral direction Y). When stretched, the stretchable sheet 36 stretches in the transverse direction Y with little so-called width shrinkage.

  The forming material of the stretchable sheet 36 will be described. As the fibers constituting the fiber sheets 37 and 38 (extensible fiber layers mainly composed of inelastic fibers), substantially inelastic inelastic fibers are used. Specifically, for example, fibers made of polyester such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) or polybutylene terephthalate (PBT), polyamide, and the like can be given. The fibers constituting the fiber sheets 37 and 38 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.

  The fiber sheets 37 and 38 may each be a continuous filament or a short fiber nonwoven fabric. In particular, from the viewpoint of making the stretchable sheet 36 thick and bulky, the fiber sheets 37 and 38 are preferably short fiber nonwoven fabrics. 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 fiber sheet 37 and the fiber sheet 38 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. . When at least one of these is different, it is a “heterogeneous sheet”.

  It is preferable that the fiber sheets 37 and 38 each comprise two or more components, that is, a low melting point component and a high melting point component. In that case, the constituent fibers are bonded to each other at the fiber intersection by heat fusion of at least the low melting point component. As the core-sheath type composite fiber composed of two or more components of a low melting point component and a high melting point component, those having a core of high melting point PET, PP and a sheath of low melting point PET, PP, PE are preferable. In particular, the use of these composite fibers is preferable because the fusion with the elastic filament 39 becomes strong and peeling between the two hardly occurs.

The thicknesses of the fiber sheets 37 and 38 are each preferably 0.05 mm or more, more preferably 0.1 mm or more, and preferably 5 mm or less, more preferably 1 mm or less. The thickness of the sheet is such that the sheet to be measured is sandwiched between flat plates with a load of 0.5 cN / cm ² , and cross sections of the three sheets separated in the longitudinal direction in one diaper are microscopes (VHX made by KEYENCE Inc.). 1000) or the like, and the thickness is obtained at each cross section, and can be obtained as an average value of three thicknesses. The basis weights of the fiber sheets 37 and 38 are each preferably 3 g / m ² or more, more preferably 5 g / m ² or more, and preferably 100 g / m ² from the viewpoints of texture, thickness, and design properties. Hereinafter, it is more preferably 30 g / m ² or less.

The basis weight of the plurality of elastic filaments 39 disposed between the fiber sheets 37 and 38 (basis weight of the elastic filament layer) is preferably 3 g / m ² or more from the viewpoints of stretchability, texture, thickness, cost, and the like. More preferably, it is 4 g / m ² or more, and preferably 30 g / m ² or less, more preferably 15 g / m ² or less.

  The elastic filament 39 is made of, for example, a thermoplastic elastomer or rubber. In particular, when a thermoplastic elastomer is used as a raw material, it can be melt-spun using an extruder in the same manner as a normal thermoplastic resin, and the elastic filament thus obtained is easily heat-sealed. 36 is suitable. 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.

  Hereinafter, the manufacturing method of the elastic sheet 36 is demonstrated with reference to FIG. 7 based on the preferable embodiment. In the present embodiment, as shown in FIG. 7, the elastic filament 39 is spun from the spinning nozzle 61 while being drawn and stretched at a predetermined speed before the elastic filament 39 is solidified. The elastic filament 39 is fused to the fiber sheets 37 and 38 so that the filaments 39 are arranged in one direction without crossing each other, and then the fiber sheets 37 and 38 to which the elastic filament 39 is fused are joined to the elastic filament 39. The fiber sheets 37 and 38 are stretched by extending along the extending direction.

As shown in FIG. 7, the spinning nozzle 61 is provided in the spinning head 62. The spinning head 62 is connected to the extruder. The resin can also be supplied to the spinning head 62 via a gear pump. The elastic resin melt-kneaded by the extruder is supplied to the spinning head 62. In the spinning head 62, a large number of spinning nozzles 61 are arranged in a straight line. The spinning nozzle 61 is disposed along the width direction of the fiber sheets 37 and 38. The interval between the adjacent spinning nozzles 61 corresponds to the interval between the elastic filaments 39 in the target stretchable sheet 36. The spinning nozzle 61 is usually circular and has a cylindrical nozzle hole.

  The spun elastic filaments 39 spun together with the fiber sheets 37 and 38 fed from the original fabric at the same speed, and are sandwiched between the fiber sheets 37 and 38 and taken up at a predetermined speed. The take-up speed of the elastic filament 39 coincides with the feeding speed of the fiber sheets 37 and 38. The take-up speed of the elastic filament 39 affects the diameter of the elastic filament 39 and the draw ratio. The tension generated in the elastic filament 39 by stretching prevents the elastic filament 39 from being disturbed due to wind or static electricity when the elastic filament 39 is bonded to the fiber sheets 37 and 38. Thereby, the elastic filaments 39 can be arranged in one direction without crossing each other.

  The elastic filament 39 joins the fiber sheets 37 and 38 before solidification, that is, in a state where it can be fused. As a result, the elastic filament 39 is fused to the fiber sheets 37 and 38 while being sandwiched between the fiber sheets 37 and 38. In other words, the elastic filament 39 is pulled and stretched by fusing the elastic filament 39 before solidification to the conveyed fiber sheets 37 and 38. When the elastic filament 39 is fused, heat is not applied to the fiber sheets 37 and 38 from the outside. That is, the elastic filament 39 and the fiber sheets 37 and 38 are fused only by heat of fusion caused by the elastic filament 39 that can be fused. As a result, among the constituent fibers of the fiber sheets 37 and 38, only the fibers existing around the elastic filament 39 are fused with the elastic filament 39, and the fibers existing at a position farther than that are not fused. As a result, since the heat applied to the fiber sheets 37 and 38 is kept to a minimum, the good texture inherent to the nonwoven fabric itself is maintained. Thereby, the texture of the obtained stretchable sheet 36 is improved.

  Until the spun elastic filament 39 joins the fiber sheets 37 and 38, the elastic filament 39 is stretched and molecules are oriented in the stretching direction. Also, the diameter is reduced. From the viewpoint of sufficiently stretching the elastic filament 39 and from the viewpoint of preventing yarn breakage of the elastic filament 39, wind of a predetermined temperature (hot air or cold air) is blown onto the spun elastic filament 39 to adjust the temperature of the elastic filament 39. You may adjust it.

  The stretching of the elastic filament 39 is not only stretching in the molten state (melt stretching) of the resin composition (elastic resin) constituting the elastic filament 39 but also stretching in the softened state (softening stretching) in the cooling process. Also good. As used herein, the molten state is a state in which the resin flows when an external force is applied. The melting temperature of the resin is measured as a peak temperature of Tan δ by viscoelasticity measurement (for example, measured by adding vibration strain in the rotational direction to a resin sandwiched between circular parallel plates). In order to prevent yarn breakage during stretching of the resin composition, it is preferable to secure a long stretching section. From this viewpoint, the melting temperature of the resin composition is preferably 130 to 300 ° C. Further, from the viewpoint of heat resistance (molding temperature) of the resin composition, the melting temperature is preferably 130 to 220 ° C. The softening temperature is measured as the temperature at the inflection point of the storage elastic modulus G ′ in the viscoelastic property of the measurement sample of the resin composition in sheet form. The range from the softening temperature to the melting temperature is called a softened state. The softening temperature is preferably 60 ° C. or higher, and more preferably 80 ° C. to 180 ° C., from the viewpoint of crystal growth of the resin composition during storage of the stretchable sheet 36 and a decrease in stretchability of the stretchable sheet 36 due to body temperature.

  The temperature of the elastic filament 39 when the elastic filament 39 and the fiber sheets 37 and 38 are bonded is preferably 100 ° C. or higher in order to ensure fiber fusion. Further, from the viewpoint of obtaining the stretchable sheet 36 having good stretchability by maintaining the shape of the elastic filament 39, the temperature of the elastic filament 39 is preferably 180 ° C. or lower. More preferably, it is the range of 120-160 degreeC. The bonding temperature is determined by using a film made of modified polyethylene or modified polypropylene having a melting point different from the melting point of the resin composition constituting the elastic filament 39 as a laminate base material to be bonded to the elastic filament 39. It can be measured by observing. At this time, if the elastic filament 39 and the laminate base material are fused, the joining temperature is equal to or higher than the melting point of the laminate base material.

  At the time of joining the elastic filament 39 and the fiber sheets 37 and 38, the elastic filament 39 is substantially in an unstretched state (a state in which it does not shrink when an external force is removed). In the joined state, at least a part of the fibers (non-elastic fibers) constituting the fiber sheets 37 and 38 are fused to the elastic filament 39, or further, the elastic filament 39 and the fiber sheets 37 and 38 are configured. More preferably, both at least part of the fibers are fused. This is because sufficient bonding strength can be obtained. The expansion / contraction characteristics of the resulting elastic sheet 36 are affected by the density of the joint points between the elastic filament 39 and the fiber sheets 37 and 38. In addition, the expansion / contraction characteristics can be adjusted by the joining temperature, the joining pressure, and the joining point detachment due to the stretching of the fiber sheets 37 and 38 described later. By bonding the constituent fibers of the fiber sheets 37 and 38 to the elastic filament 39, the bonding strength of each bonding point increases. Lowering the density of the joining points is preferable because the expansion and contraction inhibition by the fiber sheets 37 and 38 is reduced, and the expansion and contraction sheet 36 having sufficient bonding strength is obtained.

  When the elastic filaments 39 are merged with the fiber sheets 37 and 38, the elastic filaments 39 are arranged in one direction without crossing each other. Then, the elastic filament 39 is merged with the fiber sheets 37 and 38 and the elastic filament 39 is sandwiched between them, and these three members are clamped by a pair of nip rolls 63 and 63. The condition of the clamping pressure affects the texture of the obtained stretchable sheet 36. If the sandwiching pressure is too large, the elastic filament 39 tends to bite into the fiber sheets 37 and 38, and the texture of the stretchable sheet 36 obtained due to the elastic filament 39 tends to decrease. From this viewpoint, the clamping pressure by the nip rolls 63 and 63 is sufficient so that the elastic filament 39 contacts the fiber sheets 37 and 38, and an excessively high clamping pressure is not required.

  Another condition for the clamping pressure by the nip roll 63 is the temperature of the nip roll 63. As a result of the study by the present inventors, it is better not to heat the nip roll 63 in a heated state (i.e., to make it happen), or to perform the pressing while cooling, so that the texture is better. It was found that the elastic sheet 36 was obtained. When cooling the nip roll 63, it is preferable to use a coolant such as cooling water and adjust the temperature so that the set surface temperature of the nip roll 63 is 10 to 50 ° C.

  In this way, a composite 36 ′ in which the elastic filament 39 is sandwiched between the two fiber sheets 37 and 38 is obtained. When the fiber sheets 37 and 38 that are inherently extensible are used, the composite 36 ′ becomes the stretchable sheet 36 itself. On the other hand, when the fiber sheets 37 and 38 that are not inherently extensible are used, the composite 36 ′ including the fiber sheets 37 and 38 is stretched. This stretching process is performed by an operation of stretching the composite 36 ′ along the direction in which the elastic filament 39 extends to impart extensibility to the fiber sheets 37 and 38. In this manufacturing method, as shown in FIG. 7, using a stretching device having a pair of tooth gap rolls 64, 65 in which teeth and roots are alternately formed in the circumferential direction, By introducing the composite 36 ′ and transporting it, the composite 36 ′ is stretched along the transport direction, that is, the direction in which the elastic filament 39 extends. In this way, the target elastic sheet 36 is obtained.

  As mentioned above, although embodiment of this invention was described, this invention is not restrict | limited to the said embodiment, It can change suitably. For example, in the embodiment, the front side belt-like region 10A and the rear side belt-like region 10C are respectively provided with the abdominal outer layer sheet 31A or the back outer layer sheet 31C and the elastic material 13 as the elastic sheet. These may be disposed only in one of 10A and the rear belt-like region 10C. For example, the front leg elastic member 34 may not be disposed. The following additional notes are disclosed with respect to the embodiment of the present invention described above.

<1>
An absorptive main body having a longitudinal direction corresponding to the wearer's front-rear direction and a transverse direction perpendicular thereto and including a liquid-retaining absorbent core in the laterally central part, and the non-skin facing of the absorptive main body The outer body arranged on the surface side is provided, and both side edges along the longitudinal direction of the outer body in the front body and the rear body are joined together to form a pair of side seal parts, a waist opening part, and a pair of leg openings. An absorbent article being formed,
The front end and the rear end of the absorbent core in the vertical direction are placed at the same position in the vertical direction with the lower end of the side seal portion, or are positioned inward in the vertical direction from the lower end,
The exterior body has a stretchable sheet, and the stretchable sheet as a whole has a stretchability in the lateral direction, and is arranged so as to straddle the longitudinal front and rear ends of the absorbent core in the longitudinal direction. ,
A region in the vicinity of the front end of the core in the longitudinal direction extending from the front end in the longitudinal direction of the absorbent core to a position separated by a predetermined distance inward and outward in the longitudinal direction, The region that is formed of an extension region and crosses the absorbent article in the lateral direction is a front side belt-like region, and extends from the longitudinal rear end of the absorbent core to the longitudinally inner and outer sides by a predetermined distance. A region in the vicinity of the longitudinal rear end of the core, and an extension region in the case where the region in the vicinity of the longitudinal rear end of the core is virtually extended in the lateral direction. In the case of the belt-like region, at least a part of both belt-like regions is provided with a stretchable material having stretchability in the vertical direction at a position farther from the wearer's skin than the absorbent core. In the band Longitudinal end or absorbent articles are arranged so as to straddle the imaginary extension of the absorbent core.

<2>
The absorption according to <1>, wherein a lateral length L1 from the pair of side seal portions to a side edge along the longitudinal direction of the absorbent core is longer than a lateral length L2 of the absorbent core. Sex goods.
<3>
The ratio of the length L1 to the length L2 is preferably 1.2 or more, more preferably 1.5 or more, and preferably 2.5 or less, more preferably 2.0 or less as L1 / L2. The absorptive article given in the above <2>.
<4>
The absorbent article according to <2> or <3>, wherein the length L1 is preferably 190 mm or more, more preferably 210 mm or more, and preferably 300 mm or less, more preferably 270 mm or less.
<5>
The absorbent article according to any one of <2> to <4>, wherein the length L2 is preferably 70 mm or more, more preferably 100 mm or more, and preferably 200 mm or less, more preferably 180 mm or less. .

<6>
The outer surface of the absorbent core is covered with a core wrap sheet, and the core wrap sheet has extending portions extending outward in the longitudinal direction from the longitudinal front and rear ends of the absorbent core, and the expansion and contraction The absorbent article according to any one of <1> to <5>, wherein the sheet is disposed so as to straddle the extending portion of the core wrap sheet in the lateral direction.
<7>
The extending part of the core wrap sheet is the absorbent article according to <6>, wherein the front side and the rear side are located at the same position in the vertical direction as the side seal part.
<8>
The absorption according to any one of <1> to <7>, wherein the stretchable sheet has a configuration in which a thread-like elastic filament is bonded to one surface of an extensible fiber layer mainly composed of inelastic fibers. Sex goods.

<9>
Said <1>-which the said absorptive main body comprises the absorber containing the surface sheet which forms a skin opposing surface, the back surface sheet which forms a non-skin opposing surface, and the said absorptive core interposed between both sheets. The absorbent article according to any one of <8>.
<10>
The top sheet and the back sheet are each longer in the longitudinal direction than the absorbent core, and have extending portions that extend outward in the longitudinal direction from the longitudinal front and rear ends of the absorbent core, The absorbent article according to <9>, wherein the extension part is present at the same position in the longitudinal direction as the side seal part on both the front side and the rear side in the longitudinal direction.
<11>
<1> to <10>, wherein the exterior body includes a laminate of an outer layer sheet that forms a non-skin facing surface and an inner layer sheet that is disposed to face the skin facing surface of the outer layer sheet. The absorbent article according to any one of the above.
<12>
The absorbent article according to any one of <1> to <11>, wherein the outer layer sheet is formed of the stretchable sheet.

<13>
The outer body is a leg elastic member that forms leg gathers at the opening edge of each of the pair of leg openings, and one or more thread-like or belt-like front leg elastic members arranged in an extended state on the front body And an absorbent article according to any one of the above items <1> to <12>, comprising one or more thread-like or belt-like rear leg elastic members arranged in an extended state on the back body. .
<14>
The pair of front leg elastic members extend inward in the vertical direction and inward in the lateral direction from the respective side edge portions (the side seal portions) along the longitudinal direction of the exterior body in the front body along the leg edge portions. It reaches the side edge along the longitudinal direction of the absorbent main body, further extends inward in the lateral direction from the side edge, and the end of the front leg elastic member opposite to the side edge of the exterior body is The absorbent article according to <13>, which is located in an arrangement region of the absorbent main body.
<15>
Of the pair of front leg elastic members, the front leg elastic member starting from one of the side edges along the longitudinal direction of the exterior body in the front body, and the front leg elastic member starting from the other The absorbent article according to <14>, wherein the elastic members do not exhibit elastic stretchability between the leg elastic members that are not connected and exist in the region where the absorbent main body is disposed.
<16>
The pair of rear leg elastic members extend inward in the vertical direction and inward in the horizontal direction along the leg edges from both side edges (the side seal parts) along the vertical direction of the exterior body in the back body. It reaches the side edge along the longitudinal direction of the absorbent main body, extends further inward in the lateral direction than the side edge, and is the end of the rear leg elastic member opposite to the side edge portion side of the exterior body The absorbent article according to any one of <13> to <15>, wherein the portion is located in an arrangement region of the absorbent main body.
<17>
Of the pair of rear leg elastic members, a rear leg elastic member starting from one of both side edges along the longitudinal direction of the exterior body in the back body, and a rear leg elastic starting from the other The absorbent article according to <16>, wherein the elastic stretchability by the elastic member is not expressed between the leg elastic members that are not connected to the member and exist in the arrangement region of the absorbent main body.
<18>
The absorbent article according to any one of <13> to <17>, wherein the stretchable material in the front belt-shaped region is the front leg elastic member.
<19>
The absorbent article according to any one of <13> to <18>, wherein the stretchable material in the rear belt-shaped region is the rear leg elastic member.

<20>
The stretchable sheet has a stretchability as a whole, and the stretchable sheet is a composite stretchable material in which a thread-like or belt-like elastic member is joined to a sheet-like member in an elongated state by an adhesive. The absorbent article according to any one of <1> to <19>, which is not included.
<21>
The longitudinal length of the absorbent core is preferably 230 mm or more, more preferably 300 mm or more, and preferably 550 mm or less, more preferably 500 mm or less, according to any one of the above items <1> to <20> The absorbent article as described.
<22>
The lateral length of the portion having the shortest lateral length in the absorbent article is preferably 90 mm or more, more preferably 120 mm or more, and preferably 320 mm or less, more preferably 290 mm or less <1> The absorbent article according to any one of to <21>.
<23>
The longitudinal length of the absorbent article is preferably 580 mm or more, more preferably 620 mm or more, and preferably 840 mm or less, more preferably 800 mm or less, according to any one of <1> to <22>. Absorbent articles.
<24>
The length in the vertical direction of the side seal portion is preferably 50 mm or more, more preferably 80 mm or more, and preferably 200 mm or less, more preferably 180 mm or less, according to any one of the above items <1> to <23> The absorbent article as described.
<25>
Between the lower edge of the side seal part of each of the side edge part along the longitudinal direction of the exterior body of the front body joined at the side seal part and the side edge part along the longitudinal direction of the exterior body of the rearward appearance. The absorption according to any one of <1> to <24>, wherein the length along the longitudinal direction is preferably 300 mm or more, more preferably 350 mm or more, and preferably 550 mm or less, more preferably 500 mm or less. Sex goods.
<26>
The absorbent article according to any one of <1> to <25>, wherein the stretchable material is a band-like or thread-like elastic member.
<27>
The absorbent article according to any one of <1> to <25>, wherein the stretchable material is a stretchable film.

1,1Z Pants-type disposable diaper (absorbent article)
2 Absorbent body 21 Top sheet 22 Back sheet 23 Absorber 24 Absorbent core 24a Front end of the absorbent core (vertical end)
24b Longitudinal rear end of the absorbent core (longitudinal end)
24VL Virtual extension of the longitudinal end of the absorbent core 25 Core wrap sheet 3 Exterior body 31 Outer layer sheet 31A Ventral outer layer sheet (expandable sheet)
31B Crotch outer layer sheet 31C Back side outer layer sheet (elastic sheet)
32 inner layer sheet 33 waist elastic member 34 front leg elastic member 35 rear leg elastic member 36 elastic sheet 37, 38 fiber sheet 39 elastic filaments 10A, 10C belt-like area 11 core longitudinal end vicinity area 12 extension area 13 elastic material A ventral side Part B Crotch C Back side S Side seal part X Longitudinal direction Y Lateral direction

Claims (5)

An absorptive main body having a longitudinal direction corresponding to the wearer's front-rear direction and a transverse direction perpendicular thereto and including a liquid-retaining absorbent core in the laterally central part, and the non-skin facing of the absorbent main body The outer body arranged on the surface side is provided, and both side edges along the longitudinal direction of the outer body in the front body and the rear body are joined together to form a pair of side seal parts, a waist opening part, and a pair of leg openings. An absorbent article being formed,
The front end and the rear end of the absorbent core in the vertical direction are placed at the same position in the vertical direction with the lower end of the side seal portion, or are positioned inward in the vertical direction from the lower end,
The exterior body has a stretchable sheet, and the stretchable sheet as a whole has a stretchability in the lateral direction, and is arranged so as to straddle the longitudinal front and rear ends of the absorbent core in the longitudinal direction. ,
A region in the vicinity of the front end of the core in the longitudinal direction extending from the front end in the longitudinal direction of the absorbent core to a position separated by a predetermined distance inward and outward in the longitudinal direction, The region that is formed of an extension region and crosses the absorbent article in the lateral direction is a front side belt-like region, and extends from the longitudinal rear end of the absorbent core to the longitudinally inner and outer sides by a predetermined distance. A region in the vicinity of the longitudinal rear end of the core, and an extension region in the case where the region in the vicinity of the longitudinal rear end of the core is virtually extended in the lateral direction. In the case of the belt-like region, at least a part of both belt-like regions is provided with a stretchable material having stretchability in the vertical direction at a position farther from the wearer's skin than the absorbent core. In the band Longitudinal end or absorbent articles are arranged so as to straddle the imaginary extension of the absorbent core.   The absorbent article according to claim 1, wherein a lateral length from the pair of side seal portions to a side edge along a longitudinal direction of the absorbent core is longer than a lateral length of the absorbent core.   The outer surface of the absorbent core is covered with a core wrap sheet, and the core wrap sheet has extending portions extending outward in the longitudinal direction from the longitudinal front and rear ends of the absorbent core, and the expansion and contraction The absorbent article according to claim 1 or 2, wherein the sheet is disposed so as to straddle the extending portion of the core wrap sheet in the lateral direction.   The extension part of the said core wrap sheet | seat is an absorbent article of Claim 3 which exists in the same position in the longitudinal direction with the said side seal part on the front side and back side of the vertical direction.   The absorbent article according to any one of claims 1 to 4, wherein the stretchable sheet has a configuration in which a thread-like elastic filament is bonded to one surface of an extensible fiber layer mainly composed of inelastic fibers.

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