Brief-type absorbent article

Abstract

To prevent leakage from a back side by easily deforming an absorbent article along a valley and a bulge of hips while keeping liquid retention of an absorber.SOLUTION: An embossment groove 18 recessed to a side of a surface sheet 11 along a site corresponding to a hip part groove of a wearer is provided on a side surface of a leakage prevention sheet 12 of an absorbent body 10. A plurality of first linear expanding and contracting parts 30 which intersect the embossment groove 18 and are spaced apart along the embossment groove 18 are provided, and a second linear expanding and contracting part 31 which extends in a substantially width direction of a shorts-type absorbent article 1 to enclose an apex of a bulge of hips of the wearer and a third linear expanding and contracting part 32 which extends in a substantially front-back direction of the shorts-type absorbent article 1 are provided.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to short-type absorbent articles such as short-type sanitary napkins and disposable diapers, and particularly to a short-type absorbent article in which the back region of the absorbent body is easily deformed along the valleys and bulges of the buttocks.

Background Art

[0002] Conventionally, many short-type absorbent articles have been proposed that improve the fit and prevent leakage. For example, in Patent Document 1, a plurality of recesses are formed in a core rear portion of an absorbent core, which is located behind the central position of the absorbent article in the longitudinal direction, in a state of being dispersed in the longitudinal direction and the lateral direction, and the recess is formed by a through portion or a low basis weight portion. An absorbent article is disclosed. Further, in Patent Document 2, the absorbent body has at least one channel (low basis weight portion of the absorbent body) extending along the longitudinal direction, and at least one of the back waist belt and the front waist belt is located at the central portion in the width direction and extends from the inner edge in the longitudinal direction to the outside. It has a low stretch region with low stretchability in the width direction and a pair of high stretch regions adjacent to both sides in the width direction of the low stretch region and having high stretchability in the width direction. At least one of the rear and front portions of the channel in the longitudinal direction overlaps the low stretch region in the thickness direction. In plan view, the inner edge in the width direction of each of the pair of high stretch regions is located between the edge of the absorbent body facing the high stretch region in the width direction and the channel. A pant-type diaper is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as described in Patent Documents 1 and 2 above, when a through-hole or a low basis weight portion is formed in the absorber to prevent distortion of the absorber and improve the fit, the liquid retention property of the absorber decreases accordingly, increasing the likelihood of leakage to the outside.

[0005] In addition, users of disposable short-type or panty-type sanitary napkins expect that there will be no leakage in any sleeping position, that bedding such as sheets and futons will not be soiled, and that there will be no need to wash because they do not have to wear cloth shorts. However, since the absorber is difficult to deform along the valley of the buttocks, menstrual blood tends to flow dorsally along the buttock groove and may leak from the dorsal waist portion. In particular, at night when the menstrual flow is heavy, users become anxious and the quality of sleep deteriorates.

[0006] Therefore, the main object of the present invention is to provide a short-type absorbent article that is easily deformable along the valley and bulge of the buttocks while maintaining the liquid retention property of the absorber and preventing leakage from the back side.

Means for Solving the Problems

[0007] As a first aspect for solving the above problems, an absorbent main body in which an absorber is interposed between a liquid-permeable surface sheet and a liquid-impermeable leakage-preventing sheet, and an exterior body integrally provided on the outer surface side of the absorbent main body. In the product state, a short-type absorbent article in which a waist opening and a pair of left and right leg openings are formed by joining the front body and the back body of the exterior body at both side portions, An emboss groove recessed toward the surface sheet side is provided along a portion corresponding to the wearer's buttock groove on the side surface of the leakage-preventing sheet of the absorbent main body. A plurality of first linear expansion / contraction portions are provided across the emboss groove and at intervals along the emboss groove. In addition, a second linear expansion / contraction portion along the substantially width direction of the short-type absorbent article and a third linear expansion / contraction portion along the substantially front-rear direction of the short-type absorbent article are provided so as to surround the top of the wearer's buttock bulge. A short-type absorbent article is provided.

[0008] In the first aspect, on the side surface of the leak-proof sheet of the absorbent main body, an embossed groove recessed toward the surface sheet side is provided along the portion corresponding to the hip groove of the wearer, and a plurality of the first linear elastic parts are provided so as to cross this embossed groove. Therefore, due to the contraction force of the first linear elastic part, the embossed groove becomes the folding base end, and the absorbent main body easily deforms into a ridge on the skin side along the hip groove, and the absorbent main body surely fits into the valley of the hip. Further, since the second linear elastic part and the third linear elastic part are provided so as to surround the top of the swelling of the wearer's hip, the absorbent main body deforms three-dimensionally along the swelling of the hip due to the contraction force of these second linear elastic part and third linear elastic part. In this way, since the absorbent main body deforms along the valley and swelling of the hip and fits the shape of the wearer's hip, leakage from the back side can be surely prevented. Such an effect is exhibited in a state where the liquid retention property of the absorber is maintained without providing a penetrating part or a low basis weight part in the absorber.

[0009] As a second aspect, there is provided a short-type absorbent article according to claim 1, wherein the first linear elastic part and the second linear elastic part are provided on the outer wrapper, and the third linear elastic part is provided on the absorbent main body.

[0010] In the second aspect, from the manufacturing viewpoint of facilitating manufacturing by making the flow direction in the production line coincide with the direction in which each linear elastic part extends, the first linear elastic part and the second linear elastic part are provided on the outer wrapper, and the third linear elastic part is provided on the absorbent main body.

[0011] As a third aspect, there is provided a short-type absorbent article according to any one of claims 1 and 2, wherein the third linear elastic part is provided only on the outer side portion in the width direction of the swelling of the wearer's hip and is not provided on the inner side portion in the width direction.

[0012] In the above-described third aspect, among the second linearly extensible and contractible part and the third linearly extensible and contractible part arranged so as to surround the top of the swelling of the wearer's buttocks, the third linearly extensible and contractible part is arranged only on the outer part in the width direction of the swelling of the buttocks and not on the inner part in the width direction. As a result, the second linearly extensible and contractible part and the third linearly extensible and contractible part are arranged so as to surround the top of the swelling of the wearer's buttocks in a substantially U-shape. Since the inner part in the width direction is close to the buttocks groove, if the contraction force in the front-rear direction is too strong, irregularities will occur in the front-rear direction in the portion deformed along the valley of the buttocks, and it will be difficult for the absorbent body to fit into the buttocks groove.

[0013] As a fourth aspect, there is provided a shorts-type absorbent article according to any one of claims 1 to 3, wherein the first linearly extensible and contractible part, the second linearly extensible and contractible part, and the third linearly extensible and contractible part are provided in a region that overlaps with the absorber in the thickness direction.

[0014] In the above-described fourth aspect, since each linearly extensible and contractible part mainly serves to deform the absorber along the valley and swelling of the buttocks, it is arranged only in a region that overlaps with the absorber in the thickness direction and not extended from the absorber.

[0015] As a fifth aspect, there is provided a shorts-type absorbent article according to any one of claims 1 to 4, wherein the first linearly extensible and contractible part, the second linearly extensible and contractible part, and the third linearly extensible and contractible part are each composed of a filamentary elastic extensible and contractible member.

[0016] In the above-described fifth aspect, the first linearly extensible and contractible part, the second linearly extensible and contractible part, and the third linearly extensible and contractible part are each composed of a filamentary elastic extensible and contractible member. Therefore, due to the contraction force of the filamentary elastic extensible and contractible member, the absorbent body can be surely deformed along the valley and swelling of the buttocks.

[0017] As a sixth aspect, an elastic film that can expand and contract is laminated between a first sheet layer having no stretchability and a second sheet layer, and the first sheet layer and the second sheet layer are joined at a large number of spaced-apart joints directly or via the elastic film, and the elastic film contracts due to the contraction force thereof and is made of a stretchable sheet that can be stretched when an external force is applied. The first linear stretchable portion and the second linear stretchable portion are constituted by a portion where the area ratio of the joints provided at a predetermined portion of the stretchable sheet is different from that of an adjacent region, and the third linear stretchable portion is constituted by a filamentous elastic stretchable member. The shorts-type absorbent article according to any one of claims 1 to 4 is provided.

[0018] In the above sixth aspect, since the outer package is composed of a stretchable sheet in which an elastic film is laminated between a first sheet layer and a second sheet layer, and the first linear stretchable portion and the second linear stretchable portion are constituted by a portion where the joint area ratio of the stretchable sheet is changed, it is not necessary to provide a step of arranging a filamentous elastic stretchable member on the outer package, and the manufacturing can be simplified.

[0019] As a seventh aspect, the outer contour line of the back side edge of the absorber is formed with a constricted portion that is recessed toward the center side in the front-rear direction at the center portion, and bulging portions that are formed by curves that bulge outward in the front-rear direction are formed on both sides thereof. The shorts-type absorbent article according to any one of claims 1 to 6 is provided.

[0020] In the above seventh aspect, by forming the outer contour line of the back side edge of the absorber into a predetermined shape, the back side region of the absorber is made more likely to deform along the valleys and bulges of the buttocks.

Advantages of the Invention

[0021] As described in detail above, according to the present invention, while maintaining the liquid retention property of the absorber, the absorbent article becomes more likely to deform along the valleys and bulges of the buttocks, and leakage from the back side can be prevented.

Brief Description of the Drawings

[0022]

Figure 1

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Figure 11

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Figure 17

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0024] As shown in FIGS. 1 and 2, the panty-type sanitary napkin 1 according to the present invention comprises an absorbent main body 10 with an absorber 13 interposed between a liquid-permeable surface sheet 11 and a liquid-impermeable leak-proof sheet 12, and an exterior body 20 integrally provided on the outer surface side of the absorbent main body 10. In the product state shown in FIG. 1, the front body and the rear body of the exterior body 20 are joined at the side seal portions 2 on both sides, thereby forming a panty-type sanitary napkin having a waist opening W and a pair of left and right leg openings L, L.

[0025] (Structure of the absorbent main body 10) First, an example of the structure of the absorbent main body 10 will be described with reference to FIGS. 2 to 5. The absorbent main body 10 is for absorbing and holding body fluid, and has an absorber 13 made of cotton-like pulp or the like interposed between a liquid-permeable surface sheet 11 made of non-woven fabric or the like and a liquid-impermeable leak-proof sheet 12 made of polyethylene or the like.

[0026] The surface sheet 11 is preferably made of a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like. As the material fibers constituting the non-woven fabric, synthetic fibers such as olefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, and polyamide-based fibers, as well as regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. Non-woven fabrics obtained by appropriate processing methods such as the spunlace method, the spunbond method, the thermal bond method, the meltblown method, and the needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapability, and the thermal bond method is excellent in terms of bulkiness and high compression resilience. When a large number of through holes are formed in the surface sheet 11, body fluids can be quickly absorbed, and the sheet has excellent dry touch properties. The fibers of the non-woven fabric may be either long fibers or short fibers, but short fibers are preferably used to give a towel-like texture. Also, in order to facilitate embossing, it is preferable to use those made of olefin-based fibers such as relatively low melting point polyethylene or polypropylene. Further, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a core of high melting point fibers and a sheath of low melting point fibers can also be preferably used.

[0027] The leak-proof sheet 12 is made of a sheet material having at least water-blocking properties such as polyethylene, but it is desirable to use a material having moisture permeability from the viewpoint of preventing stuffiness. This water-blocking and moisture-permeable sheet material is a microporous sheet obtained by melt-kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene, forming a sheet, and then stretching it in one or two directions. If the sheet thickness is the same, the rigidity is lower than that of a non-perforated sheet, so it is superior in terms of flexibility. As the leak-proof sheet 12, a poly-laminated non-woven fabric obtained by laminating a plastic film and a non-woven fabric may be used.

[0028] As shown in the cross-sectional views of FIGS. 3 and 4, the surface sheet 11 and the leak-proof sheet 12 are provided so as to extend outward from the outer edge of the absorber 12, and a flap portion where the absorber 13 does not intervene is formed at the outer edge portion of the absorber 13 by the laminated sheet portion of the surface sheet 11 and the leak-proof sheet 12.

[0029] The absorbent body 13 interposed between the leak-proof sheet 12 and the surface sheet 11 may be any material that can absorb and retain body fluids. For example, it is composed of cotton-like pulp and a water-absorbing polymer. The water-absorbing polymer is mixed into the pulp constituting the absorbent body as, for example, granular powder. Examples of the pulp include cellulose fibers such as chemical pulp and dissolving pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. Coniferous pulp with a longer fiber length is preferably used in terms of function and price compared to broad-leaved pulp.

[0030] In addition, synthetic fibers may be mixed into the absorbent body 13. As the synthetic fibers, for example, polyolefin-based such as polyethylene or polypropylene, polyester-based such as polyethylene terephthalate and polybutylene terephthalate, polyamide-based such as nylon, and copolymers thereof can be used, or a mixture of two of these may be used. Also, composite fibers such as core-sheath type fibers with a high-melting-point fiber as the core and a low-melting-point fiber as the sheath, side-by-side type fibers, and split fibers can be used. It is desirable to use the synthetic fibers that have been surface-treated with a hydrophilizing agent in the case of hydrophobic fibers so as to have an affinity for body fluids.

[0031] The absorbent body 13 in the illustrated example is surrounded by a wrapping sheet 14 made of crepe paper or non-woven fabric or the like for maintaining the shape of the absorbent body 13 and improving diffusibility, but this wrapping sheet 14 may not be provided.

[0032] As shown in FIG. 2, the planar shape of the absorber 13 is formed such that the area on the dorsal side is larger than that on the ventral side of the wearer. As a specific planar shape, constricted portions 13a that are recessed toward the center in the width direction are formed on both sides of a portion corresponding to the crotch of the wearer, and a substantially straight front side edge extending forward from the ventral edge thereof along the longitudinal direction is formed. The outer contour line 13b of the ventral edge connecting the left and right edges thereof is formed as an arcuate curve bulging outward. On the other hand, a rear side edge formed of a straight line that slopes such that the separation width between the left and right gradually increases toward the dorsal side is formed from the dorsal edge, which is substantially in the same width direction position as the ventral edge of the constricted portion 13a, toward the rear, and a substantially straight rear side edge extending further rearward from the edge thereof along the longitudinal direction is formed. The outer contour line 15 of the dorsal edge is formed in a predetermined shape.

[0033] In the outer contour line 15 of the dorsal edge of the absorber 13, a constricted portion 16 that is recessed toward the center in the longitudinal direction is formed in the central portion, and bulging portions 17 formed of curves that bulge outward in the longitudinal direction are formed on both sides thereof. By providing the constricted portion 16, the dorsal edge of the absorber 13 and the vicinity thereof are easily bent along a fold line extending in the longitudinal direction in the central portion in the width direction with the bottom of the constricted portion 16 as the base end, and the rear portion of the absorber 13 is easily deformed along the valley between the buttocks. Further, by providing the bulging portions 17 on both sides of the constricted portion 16, the regions on both sides bent at the central portion in the width direction are easily deformed along the bulge of the buttocks, respectively.

[0034] In this panty-type napkin 1, as shown in FIGS. 2 and 4, on the surface of the absorbent body 10 on the side of the leak-proof sheet 12 (non-skin contact surface side), along the portion corresponding to the wearer's buttock groove, an emboss groove 18 recessed toward the surface sheet 11 side (skin contact surface side) is provided. The emboss groove 18 is formed by squeezing at least the leak-proof sheet 12 and the absorber 13 integrally from the outer surface side of the leak-proof sheet 12, and is formed along the front-rear direction of the panty-type napkin 1. The emboss groove 18 is in a region dorsal to the center in the front-rear direction of the panty-type napkin 1 (see CL in FIG. 2), and extends from the portion corresponding to the vicinity of the wearer's anus to the outer contour line 15 of the dorsal edge of the absorber 13. By providing the emboss groove 18, with this emboss groove 18 as the bending base end, the central portion in the width direction of the dorsal part of the absorbent body 10 is more easily deformed along the valley between the wearer's buttocks.

[0035] In particular, it is preferable that the dorsal edge of the emboss groove 18 is connected to the bottom of the constricted portion 16 formed at the center of the outer contour line 15 of the dorsal edge of the absorber 13. Thereby, the continuity between the effect of deforming the absorbent body 10 along the valley between the buttocks by forming the constricted portion 16 and the effect of deforming the absorbent body 10 along the valley between the buttocks by the emboss groove 18 is generated, and the effects of both combine, making the central portion in the width direction of the dorsal part of the absorbent body 10 even more easily deformed along the valley between the wearer's buttocks.

[0036] As for the dimensions of the emboss groove 18, it is preferable that the width is 5 to 15 mm and the length is 50 to 150 mm.

[0037] As a modified example of the absorbent body 10, although not shown in the drawings, the width dimension of the surface sheet 11 is made slightly longer than the width of the absorbent body 13, and it only covers the absorbent body 13. The outer side thereof is a side sheet different from the surface sheet 11. Specifically, a side sheet made of a non-woven fabric material subjected to appropriate water-repellent treatment or hydrophilic treatment may be disposed according to the purpose of preventing penetration of menstrual blood, urine, etc. or enhancing the touch feeling. As such a side sheet, those formed by an appropriate processing method using natural fibers, synthetic fibers, recycled fibers, etc. as materials can be used. Preferably, a non-woven fabric with a suppressed basis weight and breathability is used to eliminate the feeling of stiffness and prevent stuffiness.

[0038] This side sheet is adhered by an adhesive such as hot melt over a range from the outer portion of the middle part in the width direction to the outer edge of the leak-proof sheet 12 from a predetermined inner position, and a side flap portion where the absorbent body 13 is not interposed is formed on both sides of the absorbent body 13 by the laminated sheet portion of the side sheet and the leak-proof sheet 12.

[0039] The inner side portion of the side sheet is almost doubled back, and one or a plurality of thread-like elastic stretch members with both ends or appropriate positions in the longitudinal direction fixed are disposed in an extended state at the longitudinal middle part inside this double sheet. By forming a non-standing portion adhered to the absorbent body 13 side in a laminated state at the front and rear ends, left and right symmetrical three-dimensional gathers that stand up on the skin side may be formed at the longitudinal middle part.

[0040] (Structure of the exterior body 20) Next, the exterior body 20 will be described with reference to FIGS. 2 to 6. The exterior body 20 has a laminated sheet structure including at least an inner non-woven fabric 21 disposed on the skin side and an outer non-woven fabric 22 disposed on the non-skin side in the body circumference region of the front body F and the back body B. An elastic stretch member is disposed in a predetermined region between the inner non-woven fabric 21 and the outer non-woven fabric 22 to impart stretchability in the width direction.

[0041] The laminated sheet structure including the inner nonwoven fabric 21 and the outer nonwoven fabric 22 may be provided over the entire length of the exterior body 20. However, as shown in the illustrated example, the inner nonwoven fabric 21 may be divided into two parts in the front and rear and arranged to be spaced apart in the front-rear direction at the crotch portion, and only the outer nonwoven fabric 22 may extend at the crotch portion. Further, the exterior body 20 may be divided into two parts in the front and rear and arranged to be spaced apart in the front-rear direction at the crotch portion.

[0042] The planar shape of the exterior body 20 forms a pseudo hourglass shape as a whole by concave leg-around cut lines 23 for forming leg openings L at both middle side portions.

[0043] As shown in FIGS. 2 and 5, in the exterior body 20, a predetermined elastic stretch member is arranged in a part of the body-around region 3 of the front body F, the body-around region 3 of the rear body B, and the intermediate region 4 therebetween, whereby stretchability in the width direction is imparted. The body-around region 3 is a region defined as the longitudinal range of the side seal portion 2 where the front body F and the rear body B are joined. The body-around region 3 can be partitioned into a waist-around region 5 provided near the opening edge of the waist opening W and a hip-around region 6 on the central side in the front-rear direction therefrom. Here, there is a relationship that the body-around region 3 = the waist-around region 5 + the hip-around region 6.

[0044] As shown in FIGS. 2 and 5, in the waist circumference region 5, between the inner nonwoven fabric 21 and the outer nonwoven fabric 22, a plurality of, in the illustrated example, five thread-like elastic stretch members 24 are arranged along the width direction and spaced apart in the front-rear direction, and appropriate positions in the stretched state are fixed with a hot melt adhesive, thereby forming a stretch region in the width direction. Further, in the waist circumference region 6, between the inner nonwoven fabric 21 and the outer nonwoven fabric 22, an elastic film 25 is stretched in the width direction, and the inner nonwoven fabric 21 and the outer nonwoven fabric 22 are joined at a large number of joining portions 26 arranged at intervals in the width direction and the front-rear direction, respectively. In the present embodiment, a part of the body circumference region 3 of the front body F, the body circumference region 3 of the back body B, and the intermediate region 4 therebetween constitutes a stretch region by the above-described elastic stretch members (thread-like elastic stretch members 24 and elastic film 25). The central portion in the front-rear direction of the intermediate region 4 is a non-stretch region because the elastic film 25 does not exist.

[0045] (Elastic sheet using elastic film 25) As the stretch sheet using the elastic film 25, the stretch sheet described in Japanese Patent No. 6052746 can be used. In the same publication, a disposable diaper having a stretch region that can stretch in the width direction is described. The outline described in the same publication will be explained below.

[0046] As shown in FIGS. 7 to 10, the stretch region has a non-elastic, for example, nonwoven fabric inner nonwoven fabric 21 and a non-elastic, for example, nonwoven fabric outer nonwoven fabric 22, and an elastic film 25 that can stretch in the width direction is laminated therebetween, and the inner nonwoven fabric 21 and the outer nonwoven fabric 22 are joined at a large number of spaced-apart joining portions 26 directly or via the elastic film 25. Here, the fact that the inner nonwoven fabric 21 and the outer nonwoven fabric 22 "have no stretchability" does not mean that they do not stretch at all, but means that they do not substantially stretch in comparison with the degree of stretchability of the elastic film.

[0047] Upon joining, as shown in Fig. 11, the inner nonwoven fabric 21, the elastic film 25, and the outer nonwoven fabric 22 are supplied between the anvil roll 60 having protrusions 60a formed on the outer surface in a predetermined pattern and the ultrasonic horn 61, and ultrasonic melting energy is applied by the ultrasonic horn 61 to melt, for example, mainly the elastic film 25, thereby joining it to the inner nonwoven fabric 21 and the outer nonwoven fabric 22.

[0048] An opposing roll 63 is arranged opposite to the anvil roll 60. A driving roll 65 is provided for this opposing roll 63, and it serves as a nip roll for sandwiching the elastic film 25.

[0049] In the structure of such a device, the elastic film 25 is wound around the opposing roll 63 and then reaches the nip position with the driving roll 65, and thereafter, it is wound around the anvil roll 60.

[0050] At that time, by making the peripheral speed of the driving anvil roll 60 faster than the peripheral speed of the driving roll 65 (and thus also the peripheral speed of the opposing roll 63), the elastic film 25 is stretched, and joining is performed by the group of protrusions 60a of the anvil roll 60 and the ultrasonic horn 61.

[0051] At this time, by selecting the speed difference that makes the peripheral speed of the anvil roll 60 faster than the peripheral speed of the driving roll 65, the elongation rate (based on when the length in the natural state is 100%) in the manufacturing process of the elastic film 25 can be set.

[0052] Fig. 8 schematically shows a cross-section of the stretchable sheet after joining in the stretched state. When the stretched state of the stretchable sheet is released, as shown in Fig. 9 (schematic diagram), it contracts due to the contraction force of the elastic film 25 and can be stretched when an external force is applied in the width direction (the left-right direction in Fig. 9). Therefore, when this stretchable sheet is used, for example, in the waist circumference direction of a short-type napkin, the waist or the waist part will be contracted.

[0053] And since the stretchable sheet can be manufactured with a predetermined area, when it is desired to apply a shrinking force to the entire desired area, the stretchable sheet may be applied. In this regard, in absorbent articles such as conventional disposable diapers, it is generally performed by fixing a plurality of rubber threads in parallel to the sheet. However, this is inferior in terms of quality degradation due to the deterioration of the hot melt adhesive for fixing the rubber threads and the sheet, and stable productivity during manufacturing. These problems can be solved by the stretchable sheet according to the present invention.

[0054] Moreover, as can be seen from the shrinking state in FIG. 9, since fine regular wrinkles or pleats are formed on the outer surface of the stretchable sheet, the tactile sensation on the wearer's skin is good.

[0055] On the other hand, in the above example, it is an example in which the inner nonwoven fabric 21 and the outer nonwoven fabric 22 are joined by melting the elastic film 25. In this case, (1) a mode in which the inner nonwoven fabric 21 or the outer nonwoven fabric 22 is joined on the surface of the elastic film 25, (2) a mode in which the surface portion of the elastic film 25 melts and penetrates between the fibers of each of the inner nonwoven fabric 21 and the outer nonwoven fabric 22 to join, (3) a mode in which substantially the entire elastic film 25 melts and penetrates between the fibers of each of the inner nonwoven fabric 21 and the outer nonwoven fabric 22 to join, and the like. In the present invention, the joining mode between layers is not limited to these examples.

[0056] Among these modes, in a mode such as (3), it can be evaluated that the inner nonwoven fabric 21 and the outer nonwoven fabric 22 are joined directly, that is, without the intervention of the elastic film 25.

[0057] The above modes (1) to (3) are cases where the melting point of the elastic film 25 is lower than the melting points of the inner nonwoven fabric 21 and the outer nonwoven fabric 22, but the melting point of the elastic film 25 may be higher than the melting point of the inner nonwoven fabric 21 and / or the outer nonwoven fabric 22. In this case, it is a form in which the surface portion of the inner nonwoven fabric 21 and / or the outer nonwoven fabric 22 on the elastic film 25 side is activated or melted and joined to the elastic film 25.

[0058] Furthermore, in addition to partial melting of the elastic film 25, the inner nonwoven fabric 21 and / or the outer nonwoven fabric 22 may also be melted for joining.

[0059] The inner nonwoven fabric 21 and / or the outer nonwoven fabric 22 may be a nonwoven fabric, and the fibers thereof may have a core-sheath structure. In this case, for example, only the sheath component of the fiber can be melted to contribute to the joining.

[0060] Now, in the region of the stretchable sheet, it is desirable that the joint area ratio occupied by the total area of the joints contained in the unit area is different in a predetermined region, so that the stretchable stress is different.

[0061] Here, the joint area ratio is, as shown in reference to FIG. 12, the ratio of the total area of the joints 26, 26... contained in the unit area S to the unit area S, expressed as a percentage. In this case, it is desirable to set the unit area S to a size that contains 10 or more joints (it is difficult to compare the stretchable stress with a small number). In the example of FIG. 12, it contains 13 joints. Also, the outer shape defining the unit area S may be other shapes such as a rectangle or a circle in addition to a square.

[0062] An example of the joint 26 is circular as shown in FIG. 12. Of course, it may be in a shape such as an ellipse or a rectangle. In FIG. 12, Lm is the array interval length in the machine direction, Lc is the array interval length in the orthogonal direction (cross direction) orthogonal to the machine direction, Pm is the pitch length in the machine direction (MD), and Pc is the pitch length in the orthogonal direction (cross direction: CD).

[0063] FIG. 13 shows a mode in which the joint area ratio is different depending on the region in the stretchable sheet.

[0064] In FIG. 13, for regions α, β, and γ, by setting the joint area ratio as α < β < γ, the stretchable stress is in the relationship of α > β > γ.

[0065] For example, when comparing α where the pitch lengths Pm and Pc are long with γ where the pitch lengths Pm and Pc are short, the elongation rate is greater for α (when the joint area ratio is low) where the pitch length Pm·Pc is long than for γ (when the joint area ratio is high) where the pitch length Pm·Pc is short. As a result, the expansion and contraction stress has the relationship α > β > γ. β is the case of the intermediate situation.

[0066] In the form of FIG. 13, since the elongation stress varies by region, when the absorbent article is worn, the contraction force varies by region, which is useful.

[0067] Incidentally, the elastic film 25 in the present invention may be one that can be stretched only in the width direction, but a two-way stretch film that can expand and contract in the orthogonal directions is preferable.

[0068] Physical properties such as the thickness, material, strain-stress characteristics, and melting point of the elastic film 25 can be appropriately selected. By selecting the relationship between this elastic film 25, the ultrasonic melting energy applied thereto, and the elongation rate of the elastic film 25 during the production of the stretch sheet, as shown in FIG. 10, through holes 27 can be formed around the joint portion 26. When the inner nonwoven fabric 21 and the outer nonwoven fabric 22 are formed of, for example, a nonwoven fabric, since the nonwoven fabric exhibits air permeability, the formation of the through holes 27 causes the front and back of the stretch sheet to exhibit air permeability. Therefore, when used, for example, as a member around the waist of a shorts-type napkin, it becomes a waist sheet with good air permeability.

[0069] The reason for the formation of the ventilation through holes 27 is not necessarily clear, but the elastic film 25 is melted by the ultrasonic melting energy, and the joint portion 26 is thinned by the pressing by the protrusion 60a of the anvil roll 60. At this time, while the elastic film 25 is also being thinned, the peripheral portion of the joint portion 26 reaches the breaking strength, and breakage starts due to the expansion and contraction stress acting on the stretch elastic film, contracts to the equilibrium point, and is considered to form an opening.

[0070] FIG. 14 schematically shows an example of the formation of the through-hole 27 in the case of a circular through-hole. Substantially crescent-shaped through-holes 27 are formed on both sides of the binding portion 26 in the machine direction (elongation direction).

[0071] The binding portion can be shaped to be long in a direction (cross direction: CD direction) orthogonal to the machine direction (elongation direction). In this case, for example, as shown in FIG. 15, a semi-circular through-hole 27 with a large opening can be formed, which is a suitable means when it is desired to enhance air permeability.

[0072] On the other hand, it is not essential that through-holes 27 are formed in all binding portions. If it is required to surely form the through-holes 27 or to make large openings, the method shown in FIG. 16 can be adopted.

[0073] That is, as shown in FIG. 16(B), the stretchable sheet on which the binding portion 26 is formed is passed between a pair of rolls 64 having ridges or protrusions 64a, and the protrusions 64a of the other roll 64 are made to bite into the space between adjacent protrusions 64a of one roll 64, so that a deformation force is applied to the stretchable sheet to form the through-holes 27.

[0074] In the short-type napkin 1 according to the present invention, as shown in FIGS. 2 and 5, in a waist region 6 of the front body F, a waist region 6 of the back body B, and a part of an intermediate region 4 between them in the outer wrapper 20, the laminated stretch structure 7 using the above-described stretchable sheet is formed. Over the entire laminated stretch structure 7, an elastic film 25 is laminated between the inner nonwoven fabric 21 and the outer nonwoven fabric 22, and in a state where the elastic film 25 is stretched in the width direction, the inner nonwoven fabric 21 and the outer nonwoven fabric 22 are joined by a large number of binding portions 26 arranged at intervals in the stretch direction (width direction) and a direction orthogonal thereto (front-back direction) (in the illustrated example, through the through-holes 27 formed in the elastic film 25).

[0075] The shapes of the individual joints 26 and through-holes 27 in their natural length states can be any shape, such as a perfect circle, an ellipse, a polygon (including linear or rounded ones) like a rectangle, a star shape, a cloud shape, etc. The size of each individual joint 26 can be determined as appropriate. However, if it is too large, the impact of the hardness of the joint 26 on the touch will be significant, and if it is too small, the bonding area will be insufficient and the materials will not be able to adhere well enough. Therefore, in a normal case, the area of each individual joint 26 is preferably 0.14 - 3.5 mm 2 or so. The opening area of each individual through-hole 27 should be greater than or equal to that of the joint 26 because the joint 26 is formed through the through-hole 27. Preferably, it is about 1 - 1.5 times the area of the joint 26.

[0076] Also, in a normal case, the area and area ratio of each individual joint 26 are preferably as follows. Area of joint 26: 0.14 - 3.5 mm 2 (especially 0.14 - 1.0 mm 2 ), Area ratio of joint 26: 1.8 - 19.1% (especially 1.8 - 10.6%).

[0077] The planar arrangement of the joints 26 and through-holes 27 can be determined as appropriate, but a regularly repeating planar arrangement is preferred, such as a rhombic lattice as shown in Fig. 17(A), a hexagonal lattice as shown in Fig. 17(B) (these are also called staggered), a square lattice as shown in Fig. 17(C), a rectangular lattice as shown in Fig. 17(D), a parallelepiped lattice as shown in Fig. 17(E) (as shown in the figure, a form in which two groups of a large number of parallel oblique rows intersect each other) (including those inclined at an angle of less than 90 degrees with respect to the stretching direction), etc. In addition to those regularly repeating, a group of joints 26 (the arrangement of the group units can be regular or irregular, and can also be in the form of a pattern or characters) can be regularly repeated. The arrangement forms of the joints 26 and through-holes 27 can be the same or different in an appropriate area.

[0078] The elastic film 25 is not particularly limited, and any resin film having elasticity by itself can be used without particular limitation. For example, a blend of one or more thermoplastic elastomers such as styrene-based elastomers, olefin-based elastomers, polyester-based elastomers, polyamide-based elastomers, and polyurethane-based elastomers, processed into a film shape by extrusion molding such as the T-die method or the inflation method, can be used. Further, as the elastic film 25, in addition to non-porous ones, those having a large number of holes or slits formed for ventilation can also be used. In particular, it is preferable that the elastic film 25 has a tensile strength in the stretching direction of 8 to 25 N / 35 mm, a tensile strength in the direction perpendicular to the stretching direction of 5 to 20 N / 35 mm, a tensile elongation in the stretching direction of 450 to 1050%, and a tensile elongation in the direction perpendicular to the stretching direction of 450 to 1400%. The tensile strength and tensile elongation (elongation at break) are measured using a tensile testing machine (for example, AOUTGRAPH AGS-G100N manufactured by SHIMADZU Corporation), with the test piece having a rectangular shape of width 35 mm × length 80 mm, and are values measured in accordance with JIS K7127:1999 "Plastics - Test Method for Tensile Properties -" with an initial chuck interval of 50 mm and a tensile speed of 300 mm / min. The thickness of the elastic film 25 is not particularly limited, but is preferably about 20 to 40 μm. Also, the basis weight of the elastic film 25 is not particularly limited, but is preferably about 30 to 45 g / m 2 and particularly preferably about 30 to 35 g / m 2 .

[0079] The melting point of each constituent member of the stretch sheet can be appropriately selected. Suitable examples are that the melting point of the elastic film 25 is 95 to 125°C, more desirably 100 to 120°C, the melting point of the inner nonwoven fabric 21 is above 125°C to 160°C, more preferably 130 to 160°C, and the melting point of the outer nonwoven fabric 22 is above 125°C to 160°C, more preferably 130 to 160°C.

[0080] The ultrasonic welding temperature can be changed by selecting the ultrasonic energy from the horn. Although the ultrasonic energy from this horn cannot be directly converted into temperature, when measured with a non-contact thermometer, a stable productivity is shown at a temperature of 40°C to 30°C on the horn side and 38°C to 28°C on the anvil roll side.

[0081] Also, under this stable operation, it is preferable to give melting energy that is higher than the melting point temperature of the elastic film 25 and is converted to 125°C to 145°C from the horn side to the elastic film 25 as inferred from the observation of the joining situation. Also, it is desirable that the melting point temperatures of the inner non-woven fabric 21 and the outer non-woven fabric 22 are lower. Also, the difference between the melting points of the inner non-woven fabric 21 and the outer non-woven fabric 22 and the melting point of the elastic film 25 is preferably about 10 to 45°C.

[0082] As the inner non-woven fabric 21 and the outer non-woven fabric 22, in the case of the waist circumference sheet of the short-type napkin 1, the optimal non-woven fabric is a spunbond non-woven fabric.

[0083] In the short-type napkin 1, as shown in FIG. 2, an intermediate region 4 is provided between the front and rear body circumference regions 3, 3, and a leg circumference portion 8 that is constricted toward the center in the width direction is formed from the central side terminal in the front-rear direction of the body circumference region 3 (the lower end in FIG. 2 reference in the front body part F) to the intermediate region.

[0084] It is sufficient that the leg circumference portion 8 is formed in at least one of the front body part F and the rear body part B. Of course, it is desirable that the leg circumference portion 8 is formed in both the front body part F and the rear body part B.

[0085] In the present invention, as shown in FIG. 2, in the exterior body 20 formed of a stretch sheet, it is desirable that the joint area ratio occupied by the total area of the joints 26 included in the unit area is different between the leg circumference portion 8 and the region Q adjacent thereto.

[0086] Although it will be a repetitive explanation, when the joint area ratio is small, the expansion and contraction stress is large. Therefore, regarding the joint area ratio of the peripheral portion 8 around the leg, it is made small to increase the expansion and contraction stress, and in the adjacent region Q, by increasing the joint area ratio and reducing the expansion and contraction stress, a large expansion and contraction force acts on the peripheral portion 8 around the leg, resulting in excellent fit.

[0087] (Linear expansion and contraction part) In the shorts-type napkin 1 according to the present invention, as shown in FIG. 2, a plurality of first linear expansion and contraction parts 30 are provided that cross the embossment groove 18 and are spaced apart along the embossment groove 18. Further, a second linear expansion and contraction part 31 along the substantially width direction of the shorts-type napkin 1 and a third linear expansion and contraction part 32 along the substantially front-rear direction of the shorts-type napkin 1 are provided so as to surround the top of the swelling of the wearer's buttocks.

[0088] The first linear expansion and contraction part 30 crosses the embossment groove 18 in the groove width direction and is provided linearly extending with a predetermined length on both sides of the embossment groove 18, respectively. A plurality of the first linear expansion and contraction parts 30 are provided along the embossment groove 18, preferably 3 to 10 locations, and in the illustrated example, 5 locations.

[0089] The second linear expansion and contraction part 31 is provided linearly along the width direction on the front side and the rear side of the top of the swelling of the wearer's buttocks, respectively. That is, it is provided at two locations spaced apart in the front-rear direction on the left and right, respectively.

[0090] The third linear expansion and contraction part 32 is provided linearly along the front-rear direction on the outer side in the width direction of the top of the swelling of the wearer's buttocks.

[0091] The top of the wearer's hip bulge refers to the top of the hip that bulges dorsally on each side with the hip groove as the boundary when the wearer is in a standing position. Although it varies depending on the body type, generally, the height from the center in the front-rear direction (CL) of the short-type napkin 1 is in the range of 120 to 300 mm, preferably 150 to 250 mm, and the range is 20 to 110 mm, preferably 30 to 95 mm, respectively, to the left and right from the center line in the width direction. Therefore, the second linear elastic portion 31 and the third linear elastic portion 32 are provided so as to surround the outside of this range.

[0092] The first linear elastic portion 30, the second linear elastic portion 31, and the third linear elastic portion 32 are each provided independently and are not connected or crossed with each other.

[0093] By providing the first linear elastic portion 30 so as to cross the emboss groove 18, the emboss groove 18 becomes the folding base end due to the contraction force of the first linear elastic portion 30, and the absorbent body 10 is likely to be deformed into a ridge on the skin side along the hip groove, so that the absorbent body 10 can surely fit into the valley of the hip.

[0094] Furthermore, since the second linear elastic portion 31 and the third linear elastic portion 32 are provided so as to surround the top of the wearer's hip bulge, the absorbent body 10 is likely to be three-dimensionally deformed along the hip bulge due to the contraction force of these linear elastic portions 31 and 32.

[0095] In this way, since the absorbent body 10 is deformed along the valley and bulge of the hip and fits the shape of the wearer's hip, leakage of body fluid from the dorsal side can be surely prevented.

[0096] In the embodiment shown in FIGS. 2 to 6, the first linear elastic portion 30, the second linear elastic portion 31, and the third linear elastic portion 32 are each composed of a filamentary elastic stretch member. The fineness of the filamentary elastic stretch member is preferably 470 dtex or more.

[0097] As shown in FIGS. 6(A) and 6(B), the first linear expansion / contraction part 30 and the second linear expansion / contraction part 31 are provided on the exterior body 20, and as shown in FIG. 6(C), the third linear expansion / contraction part 32 is provided on the absorbent main body 10. Specifically, the first linear expansion / contraction part 30 and the second linear expansion / contraction part 31 are respectively provided on the opposing surfaces of the exterior body 20 facing the absorbent main body 10, and the third linear expansion / contraction part 32 is provided on the opposing surface of the leak-proof sheet 12 facing the exterior body 20.

[0098] More specifically, most of the first linear expansion / contraction part 30 is provided on the opposing surface of the inner surface nonwoven fabric 21 facing the absorbent main body 10, and one to several, in the illustrated example, one, is arranged on the front end side of the emboss groove 18 and is provided on the opposing surface of the outer surface nonwoven fabric 22 extending forward of the inner surface nonwoven fabric 21 facing the absorbent main body 10. However, all of the first linear expansion / contraction parts 30 may be provided on the opposing surface of the inner surface nonwoven fabric 21 facing the absorbent main body 10.

[0099] Also, the second linear expansion / contraction part 31 is provided on the opposing surface of the inner surface nonwoven fabric 21 facing the absorbent main body 10, and preferably is provided in a region overlapping the elastic film 25 in the thickness direction.

[0100] The reason that the first linear expansion / contraction part 30 and the second linear expansion / contraction part 31 are provided on the exterior body 20 and the third linear expansion / contraction part 32 is provided on the absorbent main body 10 is mainly for manufacturing reasons. That is, since the first linear expansion / contraction part 30 and the second linear expansion / contraction part 31 provided on the exterior body 20 are arranged along the width direction of the panty-type napkin 1, in the manufacture of the exterior body 20 with this width direction as the line flow direction, it becomes easy to arrange the filamentous elastic expansion / contraction member along the line flow direction. Similarly, for the third linear expansion / contraction part 32 provided on the absorbent main body 10, since it is arranged along the front-rear direction of the absorbent main body 10, in the manufacture of the absorbent main body 10 with this front-rear direction as the line flow direction, it becomes easy to arrange the filamentous elastic expansion / contraction member along the line flow direction.

[0101] The third linear expansion / contraction part 32 may be provided on both the outer side and the inner side in the width direction with respect to the bulging parts of the wearer's left and right buttocks. However, as shown in the illustrated example, it is preferably arranged only on the outer side part in the width direction and not on the inner side part in the width direction. Since the inner sides in the width direction of the respective bulging parts on the left and right of the buttocks are close to the buttock groove, if the contraction force in the front-rear direction is increased, when the central part in the width direction of the absorbent body 10 is deformed into a ridge along the valley of the buttocks, there is a possibility that the deformed part of the ridge will have irregularities in the front-rear direction. By providing the third linear expansion / contraction part 32 only on the outer side part in the width direction, the top of the bulge of the buttocks will be surrounded in a substantially U-shape by the second linear expansion / contraction part 31 and the third linear expansion / contraction part 32.

[0102] The first linear expansion / contraction part 30, the second linear expansion / contraction part 31, and the third linear expansion / contraction part 32 are arranged only in the region that overlaps with the absorber 13 of the absorbent body 10 in the thickness direction and do not extend outside the absorber 13. Thereby, the absorber 13 is likely to be deformed along the valleys and bulges of the buttocks.

[0103] Also, in the region where the first linear expansion / contraction part 30, the second linear expansion / contraction part 31, and the third linear expansion / contraction part 32 are arranged, it is preferable that no other filamentary elastic expansion / contraction members are arranged adjacent to or overlapping with the filamentary elastic expansion / contraction members that constitute these parts. When other filamentary elastic expansion / contraction members are arranged adjacent to or overlapping with each other, the effect of the contraction force of the first linear expansion / contraction part 30, the second linear expansion / contraction part 31, and the third linear expansion / contraction part 32 may be reduced, or the contraction direction may change, making it difficult to fit the valleys and bulges of the buttocks. However, in the case of overlapping and arranging an elastic member that uniformly contracts substantially the entire region where these linear expansion / contraction parts 30, 31, 32 of the outer wrapper 20 are arranged, like the above-described elastic film 25, it does not matter if the contraction direction of the first linear expansion / contraction part 30, the second linear expansion / contraction part 31, and the third linear expansion / contraction part 32 does not change.

[0104] The expansion and contraction rate of the first linear expansion and contraction part 30 is preferably higher than that of other regions where the elastic film 25 of the exterior body 20 is disposed, and is preferably 275% or more (based on the length in the natural state being 100%). Further, the expansion and contraction width, which is the length range that changes when a tensile force is applied and when it is released, is preferably 10 to 30 mm.

[0105] The expansion and contraction rate of the second linear expansion and contraction part 31 is preferably higher than that of other regions where the elastic film 25 of the exterior body 20 is disposed, and is preferably 275% or more (based on the length in the natural state being 100%). Further, the expansion and contraction width, which is the length range that changes when a tensile force is applied and when it is released, is preferably 70 to 90 mm.

[0106] The expansion and contraction rate of the third linear expansion and contraction part 32 is within a range that does not interfere with the deformation into the valley between the buttocks, and is preferably smaller than that of the first linear expansion and contraction part 30 and the second linear expansion and contraction part 31, and is preferably 200% or more (based on the length in the natural state being 100%). Further, the expansion and contraction width, which is the length range that changes when a tensile force is applied and when it is released, is preferably 70 to 90 mm.

[0107] In the above-described embodiment, the first linear expansion and contraction part 30 and the second linear expansion and contraction part 31 are configured by a thread-like elastic expansion and contraction member. However, as described in the column of (the expansion and contraction sheet using the elastic film 25), it may be configured by a part where the area ratio of the joint part 26 provided at a predetermined part of the expansion and contraction sheet is different from that of the adjacent region. That is, as described above, when the joint area ratio is small, the expansion and contraction stress becomes large. Therefore, in the first linear expansion and contraction part 30 and the second linear expansion and contraction part 31, the joint area ratio is made smaller than that of the adjacent region to increase the expansion and contraction stress.

[0108] (Manufacturing method) Next, a method for manufacturing the diaper-type napkin 1 according to the present invention will be described. First, for the manufacture of the absorbent main body 10, a laminated structure in which an absorber 13 is interposed between a surface sheet 11 and a leak-proof sheet 12 is introduced between an embossing roll having convex portions at positions corresponding to the embossing grooves 18 and an anvil roll with a flat surface, so that the embossing grooves 18 are formed at predetermined positions on the leak-proof sheet 12. Then, the third linear elastic expansion / contraction portion 32 is fixed to the outer surface of the leak-proof sheet 12 in an extended state with a hot melt adhesive.

[0109] Next, for the manufacture of the exterior body 20, an elastic film 25 is interposed between the inner nonwoven fabric 21 and the outer nonwoven fabric 22, and a thread-like elastic expansion / contraction member 24 is fixed in an extended state with a hot melt adhesive around the waist. Then, the first linear elastic expansion / contraction portion 30 and the second linear elastic expansion / contraction portion 31 made of a thread-like elastic expansion / contraction member are fixed in an extended state with a hot melt adhesive to the surface facing the absorbent main body 10.

[0110] Thereafter, the absorbent main body 10 is turned inside out and joined to the surface of the exterior body 20 facing the absorbent main body 10, completing the diaper-type napkin 1.

[0111] 〔Other Embodiment Examples〕 In the above embodiment example, as shown in FIG. 2, by providing a region with a smaller joint area ratio than the adjacent region Q in the leg surrounding portion 8 of the exterior body 20, a large expansion / contraction force is applied to the leg surrounding portion 8 to improve the fit around the legs. In addition to or without providing such a region with a smaller joint area ratio, one or a plurality of thread-like or strip-like elastic expansion / contraction members are arranged in an extended state along the leg cut line 23 between the inner nonwoven fabric 21 and the outer nonwoven fabric 22 of the exterior body 20, so that an expansion / contraction force is applied to the leg surrounding portion 8 to improve the fit around the legs.

Explanation of Reference Numerals

[0112] 1…Brief-type napkin, 2…Side seal part, 3…Torso circumference area, 4…Intermediate area, 5…Waist circumference area, 6…Waist area, 7…Laminated stretch structure, 8…Leg circumference part, 10…Absorbent body, 11…Surface sheet, 12…Leakage prevention sheet, 13…Absorbent body, 14…Wrapping sheet, 15…Outer contour line of the back side edge, 16…Gathered part, 17…Bulging part, 18…Embossing groove, 20…Outer package, 21…Inner nonwoven fabric, 22…Outer nonwoven fabric, 23…Leg circumference cut line, 24…Thread-like elastic stretch member, 25…Elastic film, 26…Joint part, 27…Through hole, 30…First linear stretch part, 31…Second linear stretch part, 32…Third linear stretch part, 60…Anvil roll, 61…Ultrasonic horn, 63…Opposing roll, 64…Roll, 65…Drive roll, B…Back body, F…Front body, L…Leg opening, W…Waist opening

Claims

1. An absorbent article comprising an absorbent body with an absorber interposed between a liquid-permeable surface sheet and a liquid-impermeable leakage-preventing sheet, and an exterior body integrally provided on the outer surface side of the absorbent body. In the product state, a waist opening and a pair of left and right leg openings are formed by joining the front body part and the back body part of the exterior body at both side parts. The absorbent article is a short-type absorbent article, wherein an embossed groove recessed toward the surface sheet side is provided along a portion corresponding to the wearer's buttock groove on the side surface of the leakage-preventing sheet of the absorbent body, a plurality of first linear elastic and extensible parts are provided which cross the embossed groove and are spaced apart along the embossed groove, and a second linear elastic and extensible part along the substantially width direction of the short-type absorbent article and a third linear elastic and extensible part along the substantially front-rear direction of the short-type absorbent article are provided so as to surround the top of the swelling of the wearer's buttocks. The short-type absorbent article is characterized by this.

2. The short-type absorbent article according to claim 1, wherein the first linear elastic and extensible part and the second linear elastic and extensible part are provided on the exterior body, and the third linear elastic and extensible part is provided on the absorbent body.

3. The short-type absorbent article according to any one of claims 1 and 2, wherein the third linear elastic and extensible part is provided only on the outer part in the width direction of the swelling of the wearer's buttocks and is not provided on the inner part in the width direction.

4. The short-type absorbent article according to any one of claims 1 to 3, wherein the first linear elastic and extensible part, the second linear elastic and extensible part, and the third linear elastic and extensible part are provided in a region overlapping the absorber in the thickness direction.

5. The short-type absorbent article according to any one of claims 1 to 4, wherein the first linear elastic and extensible part, the second linear elastic and extensible part, and the third linear elastic and extensible part are each composed of a filamentous elastic and extensible member.

6. The exterior body has an elastic film laminated between a first sheet layer having no stretchability and a second sheet layer, and the first sheet layer and the second sheet layer are joined at a large number of spaced-apart joining parts directly or via the elastic film. The exterior body is composed of a stretchable sheet which contracts due to the contraction force of the elastic film and can be extended when an external force is applied. The short-type absorbent article according to any one of claims 1 to 4, wherein the first linear elastic and extensible part and the second linear elastic and extensible part are constituted by a part where the area ratio of the joining parts provided at a predetermined part of the stretchable sheet is different from that of an adjacent region, and the third linear elastic and extensible part is composed of a filamentous elastic and extensible member.

7. The outer contour line of the dorsal edge of the absorber has a constricted portion that is recessed toward the center side in the front-back direction in the central portion, and bulging portions each formed of a curve that bulges outward in the front-back direction are formed on both sides thereof. The briefs-type absorbent article according to any one of claims 1 to 6.

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