CN107847371B - absorbent articles - Google Patents

Abstract

In an absorbent article of the present invention, a pair of fastening members (8) are fixed to an absorbent body (5) in a back portion (1R), and a non-stacking portion (45) extending in the longitudinal direction X is formed in an absorbent core (40) in a crotch portion (1M). The fastening member (8) comprises a stretchable side sheet (6) fixed to the side edge (5S) of the absorbent main body (5) and a fastener tape (7). When an imaginary straight line (L1) passing through the side sheet fixing point (A) and the fastener tape fixing point (B) is drawn for each of the pair of fastening members (8) in the unfolded state of the absorbent main body (5) and in the natural state of the side sheet (6), the back-side longitudinal end (45R) of the non-fiber-gathered section (45) is located at or near the intersection point (C) of the 2 imaginary straight lines (L1), and the non-fiber-gathered section (45) extends in the longitudinal direction (X) from the back-side longitudinal end (45R) toward the stomach-side longitudinal end (40F) of the absorbent core (40).

Description

absorbent articles

technical field

The present invention relates to absorbent articles such as disposable diapers, and more particularly, to an unfolded absorbent article having a fastener member.

Background technique

As a typical aspect of the absorbent article, there can be mentioned a structure having a liquid-permeable liquid-permeable absorbent article having a ventral portion arranged on the abdominal side of the wearer, a back portion arranged on the backside, and a crotch portion located therebetween. A front sheet, a liquid impermeable back sheet, and an absorbent core disposed between the two sheets. In addition, as a disposable diaper of an absorbent article, there is known an unfolded disposable diaper in which both side edge parts in the back side part of the absorbent main body including the absorbent core are extended from the side edge parts to the side edge parts. A stretchable side panel that expands and contracts in the lateral direction is attached so as to extend laterally outward, and a fastener tape for fastening used when wearing a diaper is attached to the front end portion in the extending direction of each side panel. The unfolded disposable diaper of the above-mentioned structure can be worn by pulling the fastener tape of the back part to the abdominal part of the wearer, and fastening the fastening part of the tape to the outer surface of the abdominal part.

Moreover, in the absorbent article, conventionally, for various purposes, a groove part having a basic weight smaller than that of a peripheral part or a through hole penetrating the absorptive core in the thickness direction is formed in a part of the absorptive core. For example, in Patent Document 1, in order to easily bend the absorbent core in the transverse direction, it is described that the absorbent core in the unfolded disposable diaper is formed with two bending mechanisms symmetrically with respect to the center line of the transverse direction. of longitudinally extending grooves. Moreover, in patent document 2, in order to improve the diffusibility of excretion fluid and the fit property, it is described that the absorptive core in an unfolded disposable diaper is formed with a plurality of longitudinally extending groove portions.

prior art literature

Technical literature

Patent Document 1: Japanese Patent Laid-Open No. 2004-141532

Patent Document 2: Japanese Patent Laid-Open No. 2005-34652

SUMMARY OF THE INVENTION

The present invention provides an absorbent article having a longitudinal direction extending from a wearer's abdomen to a back side via a crotch portion and a transverse direction perpendicular thereto, and having in the longitudinal direction: a crotch part; a ventral part arranged on the wearer's ventral side rather than the crotch part; The absorptive main body includes an absorptive core obtained by piling up a core-forming material, and in the back side portion of the absorptive main body, both side edges in the longitudinal direction are formed so as to extend laterally outward from the both side edge portions. A pair of fastener components are fixed in a manner. The said absorptive core in the said crotch part is formed with the non-fiber accumulation part extended in the longitudinal direction. Each of a pair of said snap-fitting members includes: a stretchable side panel fixed to the absorptive main body so as to extend laterally outward from a side edge of the absorptive main body; and a front end portion in an extending direction from the side panel It is fixed to the buckle tape of the side panel so as to extend laterally outward. When the absorptive main body is planarly expanded to be in an expanded state and the side sheet is in a natural state, the portion of the side sheet that is positioned at the innermost in the vertical direction and the outermost in the lateral direction among the fixing portions to the absorptive main body of the side sheet is taken as The fixing point of the side panel, the part of the fixing part of the above-mentioned buckle tape and the above-mentioned side panel that is located at the innermost side in the longitudinal direction and the outermost part in the transverse direction is used as the fixing point of the buckle belt, and a pair of the above-mentioned fastening components are drawn respectively through the When the imaginary straight line L1 between the above-mentioned side panel fixing point and the above-mentioned buckle tape fixing point is, the back side longitudinal end of the above-mentioned non-fiber accumulation part is located at the intersection of the two imaginary straight lines L1 or in the vicinity of the intersection point, and the non-fiber accumulation part extends from the The back longitudinal end extends longitudinally toward the ventral longitudinal end of the aforementioned absorbent core.

Description of drawings

Fig. 1 is a plan view of the surface sheet side, that is, the skin-opposing surface side of a disposable diaper, which is an embodiment of the absorbent article of the present invention, showing an expanded state in which elastic members of each part of the absorbent main body are extended and expanded in a planar shape. .

FIG. 2 is a schematic cross-sectional view at the line I-I of FIG. 1 (arrangement site of the non-fiber accumulation portion).

FIG. 3 is a schematic cross-sectional view at the line II-II of FIG. 1 (arrangement of the members for snap-fitting).

Fig. 4 is a schematic rear view when the wearing state of the diaper shown in Fig. 1 is viewed from the back side of the wearer of the diaper.

Fig. 5 is a schematic cross-sectional view of the crotch portion in the diaper in the wearing state shown in Fig. 4 .

Detailed ways

The unfolded absorbent article can exhibit its original performance only when the buckle tape is fastened at an appropriate position or the like to be in a correct wearing state. In the unfolded absorbent articles described in Patent Documents 1 and 2, a non-fiber accumulation portion substantially free of a fiber accumulation core forming material such as a groove portion or a through hole is formed in the absorptive core. The inappropriate relationship of the fastener tapes may cause accidental wrinkling or bending of parts such as the front sheet that forms the skin-opposite side of the diaper during the fastening operation of the fastener tapes, and there is still improvement in the conformability. room. In the wearing state of the diaper, if there is an unexpected wrinkle or fold in the topsheet, a gap is formed between the topsheet and the wearer's skin, and there is a fear that excretion fluid such as urine may leak to the outside along the gap.

Therefore, the present invention provides an absorbent article that can be fitted to the crotch of a wearer by simply wearing it in a usual manner, even if no particular attention is paid to the wearing operation, thereby exhibiting a high leakage prevention effect.

Hereinafter, the absorbent article of the present invention will be described with reference to the accompanying drawings based on the disposable diaper which is a preferred embodiment thereof. As shown in Fig. 1 , the disposable diaper 1 of the present embodiment has a vertical direction X extending from the wearer's abdomen to the back via the crotch portion, and a horizontal direction Y perpendicular thereto, and has a crotch portion 1M in the vertical direction X. , which is arranged on the crotch when wearing; the ventral part 1F, which is arranged on the wearer's abdominal side rather than the crotch 1M; and the back part 1R, which is arranged on the wearer's side rather than the crotch 1M dorsal position. The crotch portion 1M includes a not-shown excretory portion opposing portion that is arranged to face a wearer's excretory portion such as a penis when worn. The excretion part opposing part is usually located at a position slightly deviated from the ventral part 1F from the center in the longitudinal direction X of the diaper 1 . The abdominal part 1F, the crotch part 1M, and the back part 1R correspond to each area|region when the diaper 1 (absorptive main body 5) is divided|segmented so that the longitudinal direction X may be divided into substantially three equal parts.

The diaper 1 is a so-called unfolded flap-type disposable diaper, and has an absorbent body 5 having a liquid-permeable front sheet 2, a liquid-impermeable or water-repellent back sheet 3, and an intervening surface sheet 3. A liquid-retaining absorber 4 arranged between the individual sheets 2, 3; and a pair of fastener members 8, 8 fixed to both side edge portions in the longitudinal direction X of the absorbent main body 5 in the back portion 1R 5S, 5S. The diaper 1 is symmetrically formed on the basis of the vertical center line CLx which divides the diaper 1 into two halves in the horizontal direction Y and extends in the vertical direction X. The absorptive main body 5 has a long rectangular shape in the vertical direction X in a plan view as shown in FIG. 1 . The pair of fastener members 8 and 8 are fixed to the absorptive main body 5 so as to extend outward in the lateral direction Y from both side edges 5S and 5S of the absorptive main body 5 in the back part 1R.

The front sheet 2 and the back sheet 3 each have a size larger than that of the absorber 4, and extend outward from the periphery of the absorber 4, and their extending portions are joined to each other by known bonding means such as adhesives, heat sealing, and ultrasonic sealing. . As the front sheet 2 and the back sheet 3, various materials conventionally used for such absorbent articles can be used without any particular limitation. For example, as the surface sheet 2, various nonwoven fabrics, apertured films, etc. can be used, and as the back surface sheet 3, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. Examples of the back sheet 3 include a form in which a liquid-impermeable film sheet exists alone, and a form in which an exterior sheet, such as a nonwoven fabric, is stacked on the outer surface side of the non-skin facing surface of the film sheet.

The absorber 4 includes: a liquid-retaining absorptive core 40; a skin-side wrapping core 41 covering the skin-opposite surface of the absorptive core 40; and a non-skin-side wrapping wrapping the non-skin-opposing surface of the absorptive core 40 chip 42 . The absorptive core 40 has an hourglass shape in which the center part of the vertical direction X is narrowed inward in a plan view as shown in FIG. 1 , and is a shape long in the vertical direction X. The absorptive core 40 has the ventral longitudinal end 40F in the ventral part 1F, and has the back longitudinal end 40R in the back part 1R, and covers the whole length of the longitudinal direction X of the crotch part 1M. As shown in FIGS. 2 and 3 , the skin-side core wrap 41 has substantially the same size as the skin-opposing surface of the absorptive core 40 , but the length (ie, width) in the lateral direction Y of the non-skin-side core wrap 42 is larger than the absorbent core 40 . The length of the transverse direction Y of the non-skin facing surface of the core 40 . The wide non-skin side wrapping sheet 42 covers the entire area of the non-skin facing surface of the absorptive core 40, and extends from both side edges of the absorptive core 40 in the longitudinal direction X to the outer side in the lateral direction Y, and its extension is It is rolled up on the skin-side core wrap 41 arranged opposite to the skin-opposing surface of the absorptive core 40 , and covers both side edges in the longitudinal direction X of the skin-side core wrap 41 .

In addition, in this specification, the "skin-facing surface" refers to the surface of the absorbent article or its constituent members (for example, the absorbent main body 5 ) that faces the skin side of the wearer when the absorbent article is worn, that is, the surface that is relatively close to the wearer. On the skin side, the "non-skin-opposite surface" is the surface of the absorbent article or its constituent members that faces the side opposite to the skin side, that is, the side relatively far from the wearer's skin when the absorbent article is worn. In addition, in this specification, "wearing" means the state which maintains the normal suitable wearing position, ie, the correct wearing position of the absorbent article, and does not include the state in which the absorbent article is displaced from the wearing position.

The absorptive core 40 is obtained by laminating a core-forming material containing an absorptive material, and has a single-layer structure. As the absorbent material, any material generally used as a material for forming such an absorbent core can be used without particular limitation, for example, wood pulp, hydrophilic fibers such as synthetic fibers treated with a hydrophilizing agent, water-absorbing polymer particles. That is, the absorptive core 40 can be a fiber accumulation body of hydrophilic fibers, or a structure in which water-absorbent polymer particles are supported in the fiber accumulation body. As the core wraps 41 and 42, for example, paper, nonwoven fabric, or the like can be used.

As shown in FIGS. 1 and 2 , the absorptive core 40 in the crotch portion 1M is formed with a non-fiber accumulation portion 45 extending in the longitudinal direction. More specifically, as shown in FIG. 1 , in the diaper 1, a pair of non-fiber laying parts 45 and 45 extending in the vertical direction X is a vertical center that divides the diaper 1 into two halves in the horizontal direction Y and extends in the vertical direction X. The line CLx is formed symmetrically as a reference. Each of the non-fiber accumulation portions 45 has a rectangular shape in plan view, and the longitudinal direction thereof coincides with the longitudinal direction X. As shown in FIG. On the skin-opposing surface of the absorptive core 40 , the length (ie, width) in the lateral direction Y of each non-fiber accumulation portion 45 is kept constant over the entire length in the longitudinal direction (vertical direction X). On the opposite side, the width of each non-fiber accumulation portion 45 is also kept constant over the entire length in the longitudinal direction.

As shown in FIG. 2, the non-fiber accumulation part 45 in the diaper 1 is a through-hole (that is, zero basis weight) in which the core formation material which comprises an absorptive core does not exist at all. However, as the non-fiber accumulation part of the present invention, in addition to the form of through-holes like the non-fiber accumulation part 45 , there are also those in which there is a small amount (specifically, about 20 g/m ² ) compared with other areas of the absorptive core. The way the core forms the material. This is because the same effect (liquid diffusion effect, etc.) as the non-fiber accumulation part composed of through-holes can be exhibited by such a non-fiber accumulation part including a small number of fiber accumulation parts. In consideration of the liquid diffusion effect and the like, the non-fiber accumulation portion composed of through holes is more preferable than the non-fiber accumulation portion including a small number of fiber accumulation portions.

As shown in FIG. 1 , the non-fiber-accumulating portion 45 has a specific absorption rate in the back portion 1R via the crotch portion 1M from a position on the inner side in the longitudinal direction X from the abdominal longitudinal end 40F of the absorptive core 40 in the abdominal portion 1F. The back-side longitudinal end 40R of the sexual core 40 is continuously present at the inner side of the longitudinal direction X. As shown in FIG. That is, the non-fiber-accumulating portion 45 has a ventral longitudinal end 45F in the ventral portion 1F, and the ventral longitudinal end 45F is located on the inner side in the longitudinal direction X from the ventral longitudinal end 40F of the absorptive core 40 , and has both longitudinal ends 45F. Between 40F and 40F, a larger amount of the core-forming material constituting the absorptive core 40 exists than the non-fiber accumulation portion 45 . In addition, the non-fiber accumulation portion 45 has a back longitudinal end 45R in the back portion 1R, and the back longitudinal end 45R is located on the inner side in the longitudinal direction X rather than the back longitudinal end 40R of the absorptive core 40 , at both longitudinal ends 45R Between 40R and 40R, the core formation material which comprises the absorptive core 40 exists in more quantity than the non-fiber accumulation part 45.

The non-fiber accumulation portion 45 (non-fiber accumulation portion composed of through-holes) is a portion formed by deliberately hindering the accumulation of fibers of the core formation material in the fiber accumulation step of the core formation material such as wood pulp when the absorptive core 40 is produced. . The absorptive core 40 having the non-fiber accumulation portion 45 can be manufactured according to a known method of manufacturing an absorptive core in the prior art. In the method of obtaining the absorptive core 40 by stacking it on a molding die on the outer peripheral surface, as the molding die, a molding die of a predetermined pattern can be used, for example, the portion corresponding to the non-fiber-laden portion 45 can be upward compared to the peripheral portion. Square protruding forming die to manufacture. In the absorptive core 40 obtained by the above-mentioned method, the part where the core forming material does not exist is the non-fiber accumulation part 45 . In addition, as another method of manufacturing the absorptive core 40 having the non-fiber accumulation portion 45, a method of manufacturing an absorbent core not having the non-fiber accumulation portion, and performing punching or punching on a predetermined portion of the absorptive core can also be employed. A post-processing such as cutting is performed to form a non-fiber accumulation portion. The absorptive core which has the said "non-fiber accumulation part containing a few fiber accumulation parts" can also be manufactured by the said method.

As shown in FIG. 2 , in the non-fiber accumulation portion 45, the skin-side core piece 41 and the non-skin side core piece 42 are joined. With the above-mentioned structure, since the adhesion between the absorptive core 40 and the two sheets 41 and 42 is improved, the shape retention of the absorptive core 40 arranged between the two sheets 41 and 42 is improved, even if the absorptive core 40 is constituted. Absorbent materials such as water-absorbent polymer particles contained in the core forming material swell by absorbing excretion fluid such as urine, and the degree of deformation of the absorptive core 40 is also suppressed. In addition, the above-mentioned structure can restrain the movement of the absorber 4 in conjunction with the action of bonding the skin-side core sheet 41 to the front sheet 2 with an adhesive and the non-skin side core sheet 42 to the back sheet 3 with an adhesive. During wearing of the diaper 1 , the absorber 4 is less likely to move with respect to the topsheet 2 or the backsheet 3 . Thereby, when the diaper 1 is used, the absorber 4 (absorptive core 40 ) is less likely to be damaged, and excellent absorption performance can be exhibited stably. Moreover, by the above-mentioned structure, the absorbability of the absorbent core 40 for taking in the excretory fluid can be improved, and the non-fiber accumulation portion 45 can be effectively prevented from being buried due to swelling of the absorbent material contained in the core forming material.

The joining part of the two sheets 41 and 42 in the non-fiber accumulation part 45 can be formed as follows, for example. That is, an adhesive such as a hot-melt adhesive is applied in advance to a position corresponding to the non-fiber accumulation portion 45 of at least one of the two sheets 41 and 42 , and the two sheets 41 and 42 are covered with absorbent properties. After obtaining the absorber 4 with the core 40 , the two sheets 41 and 42 can be joined to the non-fiber accumulation portion 45 by pressing the sheet 41 and/or the sheet 42 into the non-fiber accumulation portion 45 . When the sheets 41 and 42 are press-fitted, a known embossing process such as embossing with or without heat or ultrasonic embossing can be used. In the diaper 1, as shown in FIG. 2, the junction of the two sheets 41 and 42 is offset in the thickness direction of the absorber 4 on the non-skin-opposing surface side, that is, on the back sheet 3 side, and the non-skin side wrap core 42 is flat, but The skin-side core wrap 41 is recessed in a concave shape at the formation position of the non-fiber accumulation portion 45 . In addition, in this embodiment, the joining part of the two sheets 41 and 42 exists continuously over substantially the whole length of the longitudinal direction X of the non-fiber accumulation part 45. As shown in FIG. Here, "substantially the full length" refers to 90% or more of the complete full length.

As shown in FIGS. 1-3, the side part sheet 51 is arrange|positioned at the both left and right sides along the longitudinal direction X of the surface sheet 2 side of the absorptive main body 5, respectively. The side piece 51 has an inner edge part along the longitudinal direction X and an outer edge part located on the outer side in the lateral direction Y and along the longitudinal direction X of the inner edge part. The outer edge of the side sheet 51 extends from the side edge in the longitudinal direction X of the absorber 4 to the outer side in the transverse direction Y, and is joined to the back sheet 3 . The elastic member 52 for forming three-dimensional gathers in a linear shape is fixed to the inner edge of the side sheet 51 in an extended state (stretched state) in the longitudinal direction X, whereby the elastic member 52 shrinks when the diaper 1 is worn. Three-dimensional gathers are formed at least in the crotch portion 1M.

As shown in FIG. 1 , the absorptive main body 5 has a pair of side flaps 50 and 50 extending from the abdominal part 1F to the back part 1R and extending from the edge of the absorber 4 (absorptive core 40 ). Both side edges of the longitudinal direction X extend to the outside of the transverse direction Y, respectively. As shown in FIGS. 2 and 3 , the side flaps 50 are formed by the respective portions of the front sheet 2 , the back sheet 3 , and the side sheet 51 extending from the side edges of the absorber 4 in the longitudinal direction X to the outer side in the transverse direction Y, and each sheet 2, 3, and 51 are joined to each other by known joining means such as adhesives, heat sealing, and ultrasonic sealing. Both side edge parts 5S and 5S in the longitudinal direction X of the absorptive main body 5 include side flaps 50 .

As shown in FIGS. 1 and 2 , in each of the pair of side flaps 50 , 50 , linear elastic members 53 for forming leg gathers are arranged in an extended state so as to extend in the vertical direction X through the crotch portion 1M. The side flaps 50 in the crotch portion 1M are parts that are arranged around the legs of the wearer and function as so-called legs when the diaper 1 is worn. With the above-described configuration, the elastic members 53 pass through the legs when the diaper 1 is worn. contraction to form a pair of leg folds.

As shown in FIGS. 1 and 3 , each of the pair of fastener members 8 and 8 includes a stretchable fastener fixed to the absorptive main body 5 so as to extend outward in the lateral direction Y from the side edge portion 5S of the absorptive main body 5 . The side panel 6; and the fastener tape 7 fixed to the side panel 6 so as to extend outward in the lateral direction Y from the front end portion 6S of the side panel 6 in the extending direction. The fastening members 8 (the side sheets 6 and the fastener tapes 7 ) and the absorptive main body 5 are different members.

As shown in FIGS. 1 and 3 , the side panel 6 includes: two sheets 61 and 61 having a quadrangular shape in plan view; A plurality of elastic members 62 are provided. The plurality of elastic members 62 are arranged in the center portion of the lateral direction Y of the side panel 6 at predetermined intervals in the longitudinal direction X. As shown in FIG. The position of the elastic member 62 in the side panel 6 (the center portion in the lateral direction Y) is an expansion-contraction portion capable of expanding and contracting in the lateral direction Y, which is the extending direction of the elastic member 62 . sex. Among the both side edges of the side sheet 6 in the longitudinal direction X, the inner edge side relatively close to the vertical center line CLx is fixed to the side edges 5S (side flaps 50 ) of the absorptive main body 5 by a well-known joining means such as an adhesive. ), between the side sheet 51 and the back sheet 3, the fixing portion 60 of the side sheet 6 and the absorptive main body 5 is formed, and the outer edge portion relatively far from the longitudinal center line CLx, that is, the front end portion 6S in the extension direction is located at the side relative to the absorption The side edge portion 5S of the sex main body 5 is positioned on the outer side of the lateral direction Y.

As shown in FIGS. 1 and 3 , the fastener tape 7 includes a tape base material 71 and a fastening portion 72 . The tape base material 71 has a rectangular shape in plan view as shown in FIG. 1 , and one end side in the longitudinal direction (lateral direction Y) is fixed to the non-skin facing surface of the front end portion 6S of the side sheet 6 by a known bonding means such as an adhesive. , to form the fixing portion 70 of the buckle tape 7 and the side piece 6 . The fastener portion 72 is fixed to the inner surface (skin-opposing surface) of the portion of the tape base material 71 extending in the lateral direction Y from the front end portion 6S of the side sheet 6 . The engaging portion 72 includes a male surface member (hook surface member) of a mechanical planar fastener, and is detachably engaged with a to-be-attached region 9 of a female surface member (matt surface member) including a mechanical planar fastener described below. catch.

As the sheet material 61 constituting the side sheet 6, for example, those obtained by various manufacturing methods such as hot air nonwoven fabric, hot rolled nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric can be used. Nonwoven fabrics, woven fabrics, woven fabrics, paper, resin films, etc., and sheets obtained by laminating two or more of these and integrating them. In addition, as the tape base material 71 constituting the fastener tape 7, for example, a nonwoven fabric, a laminate of a nonwoven fabric and a resin film, or the like can be used.

As shown in FIG. 1, the to-be-fastened area|region 9 of the female member which consists of a mechanical planar fastener is formed in the non-skin opposing surface of the absorptive main body 5 in the abdominal part 1F. The to-be-fastened region 9 fixes the female member of the mechanical planar fastener to the non-skin-facing surface (outer surface) of the back sheet 3 that forms the non-skin-facing surface of the absorptive main body 5 by a known bonding means such as an adhesive. And formed, the fastening part 72 of the fastener tape 7 including the male part of the mechanical planar fastener is detachably fastened.

Moreover, as shown in FIG. 1, the abdominal flaps 55 and 55 are formed in the both side edge parts 5S and 5S along the longitudinal direction X of the absorptive main body 5 in the abdominal part 1F. The abdominal flap 55 consists of a non-stretchable sheet, the inner edge of which is fixed to the side edge 5S (side flap 50) of the absorptive main body 5 by a well-known joining means such as an adhesive, similarly to the side sheet 6 . ) between the side sheet 51 and the back sheet 3.

As one of the main features of the diaper 1 having the above-mentioned structure, as shown in FIG. 1 , when the absorptive main body 5 is expanded in a planar shape to be in an expanded state, and the pair of side panels 6 and 6 are in a natural state, respectively When drawing an imaginary straight line L1 passing through the fixing point A of the side panel and the fixing point B of the buckle tape for the pair of fastening members 8 and 8, respectively, the back longitudinal end 45R of the non-fiber accumulation portion 45 is located on the two imaginary lines. The non-fiber accumulation portion 45 extends in the longitudinal direction X from the back longitudinal end 45R to the ventral longitudinal end 40F of the absorptive core 40 at the intersection C of the straight lines L1 and L1 or in the vicinity of the intersection C.

Here, "near the intersection C" means that in the unfolded state of the absorptive main body 5 (diaper 1) as shown in FIG. 1, one side and the other side in the vertical direction X from the intersection C are absorbent The region within 15% of the entire length of the longitudinal direction X of the main body 5 is preferably within 10% of the region.

In addition, the "expanded state of the absorptive main body 5" means the state which extended the elastic member (elastic member 52, 53, etc.) which the absorptive main body 5 has, and expanded this absorptive main body 5 in a plane shape.

In addition, "the natural state of the side panel 6" means the non-stretched state which does not apply external force to the elastic member (elastic member 62 etc.) which comprises the side panel 6 at all.

In addition, as shown in FIG. 1, the "side sheet fixing point A" is, in the fixing part 60 of the side sheet 6 to the absorptive main body 5 (part joined to the absorptive main body 5 via a joining means such as an adhesive), The innermost part in the longitudinal direction X and the outermost part in the transverse direction Y. That is, the side panel fixing point A is the outermost point in the lateral direction Y at the longitudinal end of the fixing portion 60 on the crotch portion 1M side. Moreover, since the fixing|fixed part 60 in the form shown in FIG. 1 is an integral part of the overlapping part with the absorptive main body 5 in the side sheet 6, this side sheet fixing point A is located in the side edge part 5S along the longitudinal direction X of the absorptive main body 5 However, for example, when the fixing portion 60 exists at the inner side of the lateral direction Y than the side edge portion 5S, the side panel fixing point A is located at the inner side of the lateral direction Y than the side edge portion 5S.

In addition, as shown in FIG. 1, the "fastening tape fixing point B" is, among the fixing portions 70 of the fastening tape 7 to the side panel 6 (the portion that is bonded to the side panel 6 via bonding means such as an adhesive), The innermost part in the longitudinal direction X and the outermost part in the transverse direction Y. That is, the fastener tape fixing point B is the outermost point in the lateral direction Y at the longitudinal end of the fixing portion 70 on the crotch portion 1M side. In the form shown in FIG. 1, the fixing portion 70 is integral with the overlapping portion of the side panel 6 in the fastener tape 7, so the fastener tape fixing point B is located on the side edge portion of the side panel 6 along the longitudinal direction X, but For example, when the fixing portion 70 exists at the inner side in the lateral direction Y than the side edge portion, the fastener tape fixing point B is located at the inner side in the transverse direction Y than the side edge portion.

As a typical wearing operation when the mother puts the diaper 1 on the baby, the following operation can be mentioned: in the state where the baby is lying on his back, the abdominal part 1F, the crotch part 1M and the back part 1R of the diaper 1 are attached to the corresponding parts of the baby, From this state, the front end portions of each of the pair of fastener tapes 7 and 7 are grasped with fingers and pulled toward the abdominal portion 1F side, so that the fastener portion 72 of each fastener tape 7 is fastened to the quilt of the abdominal portion 1F. Fastening area 9. The imaginary straight line L1 connecting the above-mentioned side panel fixing point A and the fastening point B of the fastener tape is approximately the same as the line of force when the fastener tape 7 is stretched during the wearing operation of the above-mentioned diaper 1, and the intersection point of the two imaginary straight lines L1 and L1 C is a point where the tensile force when the diaper 1 is pulled up by grasping the fastener tape 7 acts. In addition, in the process of pulling the fastener tape 7 toward the abdominal portion 1F side for fastening, the diaper 1 is folded toward the wearer's skin side with an imaginary straight line L1 as a crease, and is positioned at a position closer to the longitudinal direction X than the crease. The ventral (front) part (crotch part 1M and ventral part 1F) is arrange|positioned so that it may fit the crotch of the wearer.

In the conventional unfolded disposable diaper, when the conventional diaper is pulled up by grasping the fastener tape during wearing, the portion corresponding to the intersection C of the diaper 1 is likely to be caught in the wearer's body, especially the groin. Therefore, in the conventional diaper, the portion arranged on the crotch of the wearer is unexpectedly wrinkled or bent, and sufficient conformability cannot be obtained, which is easy to cause. leakage. In general, the end of the back of the groin in the human body is a portion where the surface shape changes relatively greatly in a series of parts from the waist circumference of the back to the crotch including the end. Therefore, the intersection point C, which is the point of application of the tensile force when the fastener tape is stretched, is likely to be caught at the end, and the diaper may become unintentionally wrinkled or unintended due to the occurrence of such intersection C and the body being caught. Bend. When such wrinkling or bending occurs on the skin-opposing surface (front sheet side) of the diaper, a gap is formed between the skin-opposing surface and the wearer's skin, so the conformability of the diaper decreases, and the wearer's excretion occurs. The liquid leaks to the outside along the gap.

On the other hand, in the diaper 1 of the present embodiment, as shown in FIG. 1 , the non-fiber accumulation portion 45 that is lower in rigidity than the peripheral portion and tends to become a crease when the diaper 1 is folded is directed toward the abdomen from the intersection C or its vicinity. Since the side portion 1F extends in the longitudinal direction X corresponding to the front-back direction of the wearer, as described above, in the process of pulling the fastener tape 7 to the side of the abdominal portion 1F to fasten it, as shown in FIG. 4 and FIG. As shown in 5, creases are formed mainly along two imaginary straight lines L1, L1 in the back portion 1R, and the crotch portion 1M is mainly along the non-folding seam so as to be substantially continuous with the two creases (imaginary straight lines L1, L1). Creases are formed in the fiber accumulation portion 45 . As a result, in the wearing state of the diaper 1, as shown in FIG. 5, the crotch portion 1M is folded toward the non-skin-opposing surface side (the back sheet 3 side) with the two non-fiber-accumulating portions 45 and 45 as folds, and 2 The non-fiber-accumulating portions 45, 45 are fitted to the groin portion of the wearer's crotch. In addition, reference numeral 100 in FIGS. 4 and 5 denotes a wearer.

In this way, the diaper 1 is designed so that the "substantially continuous creases from the back part 1R to the crotch part 1M" that can realize an ideal wearing state with good conformability by normal wearing operations are formed only in predetermined parts ( Since the imaginary straight line L1 and the non-fiber accumulation portion 45), unexpected wrinkles and bending are unlikely to occur at other locations than the predetermined location. That is, according to the diaper 1, even if the diaper 1 is not particularly careful during the wearing operation and is only worn according to the usual method, an ideal wearing state with less unexpected wrinkles and folds and good conformability can be obtained, so that a high level of wear can be obtained. Leak-proof effect. When the back-side longitudinal end 45R of the non-fiber accumulation portion 45 is not located at or near the intersection point C but is too far away from the intersection point C, unexpected wrinkling or bending often occurs in the wearing state, so in terms of conformability and leakage prevention Satisfactory results could not be obtained.

From the viewpoint of more reliably exhibiting the effect of the formation of such creases, as shown in FIG. 1 , when the absorptive main body 5 is expanded into a planar shape to be in an expanded state, the pair of side panels 6 and 6 are When each is in a natural state, the ventral longitudinal end 53F of the leg gather forming elastic member 53 of one of the pair of side flaps 50 and 50 and the ventral longitudinal end 53F of the other elastic member 53 are in the vertical direction X. When drawing an imaginary straight line L2 passing through the two ventral longitudinal ends 53F, 53F and extending in the lateral direction, it is preferable that the ventral longitudinal end 45F of the non-fiber accumulation portion 45 is located on the imaginary straight line L2, or A portion near the imaginary straight line L2 and closer to the intersection C than the imaginary straight line L2. With the above-mentioned configuration, the non-fiber-accumulating portion 45 that can be fitted to the groin of the wearer's crotch portion and the pair of leg gathers that can be fitted to the wearer's crotch portion can complementarily function. Therefore, the conformability and the leakage prevention effect can be further improved. When the ventral longitudinal end 45F of the non-fiber accumulation portion 45 exceeds the imaginary straight line L2 and is located close to the ventral longitudinal end 5F of the absorbent body 5, the non-fiber accumulation portion 45 is affected by the non-fiber accumulation portion 45, so that when the diaper 1 is worn, the Wrinkling occurred in the ventral part 1F.

Here, "the vicinity of the imaginary straight line L2 and the position closer to the intersection C than the imaginary straight line L2" refers to a pair of side panels 6 and 6 in the unfolded state of the absorbent body 5 (diaper 1) as shown in Fig. 1 . In the natural state of the absorbent body 5, the intersection C side (crotch 1M side) from the imaginary straight line L2 is within 15% of the total length of the longitudinal direction X of the absorbent body 5, preferably within 10% of the region.

In addition, “the ventral longitudinal end 53F of the elastic member 53 ” refers to the ventral longitudinal end of the stretchable portion of the elastic member 53 , and does not necessarily coincide with the longitudinal ventral end of the elastic member 53 . That is, the "stretchable portion of the elastic member 53" is a portion fixed to the side flap portion 50 in an extended state, for example, at the ventral end portion in the longitudinal direction of the elastic member 53 (that is, the ventral end in the longitudinal direction and its (nearby) when not being fixed to the side flap part 50, since the ventral side edge part in the longitudinal direction has no stretchability, it is not "the ventral side longitudinal end 53F of the elastic member 53".

In addition, from the same viewpoint, as shown in FIG. 1 , when the absorptive main body 5 is expanded into a flat state to be in an expanded state and each of the pair of side sheets 6 and 6 is in a natural state, it is preferable that the leg gathers The back-side vertical end 53R of the elastic member 53 for forming is located in the vicinity of each of two imaginary straight lines L1 and L1. In this way, the longitudinal ends of the elastic members 53 that can follow the circumference of the wearer's legs to form leg gathers are positioned as lines of force when the fastener tapes 7 are stretched during the wearing operation of the diaper 1 and become creases. In the vicinity of the imaginary straight line L1, the conformability of the crotch portion 1M to the crotch portion of the wearer is further improved, and the leakage prevention effect is further improved.

Here, "the vicinity of the imaginary straight line L1" means from the imaginary straight line L1 in the unfolded state of the absorptive main body 5 (diaper 1) as shown in Fig. 1 and the natural state of each of the pair of side sheets 6 and 6 One side and the other side in the longitudinal direction X are respectively within 15% of the entire length of the absorbent body 5 in the longitudinal direction X, preferably within 10% of the area.

In addition, "the back side longitudinal end 53R of the elastic member 53" means the back side longitudinal end of the stretchable part of the elastic member 53 similarly to the above-mentioned "the vent side longitudinal end 53F of the elastic member 53".

Further, from the viewpoint of further improving the fit, the length W (refer to FIG. 1 ) in the vertical direction from the back longitudinal end 5R of the absorptive main body 5 to the intersection C of the two imaginary straight lines L1 and L1 is preferably absorbent 30 to 50% of the total length of the longitudinal direction X of the main body 5, particularly preferably 35 to 45%.

In addition, as the length (ie, width) of the non-fiber accumulation portion 45 in the lateral direction Y increases, the flexibility of the diaper 1 (crotch portion 1M) in the non-fiber accumulation portion 45 is improved, so that the non-fiber accumulation portion 45 can be easily formed. The creases, but the increase in the width of the non-fiber accumulation portion 45 will cause the absorption performance of the absorptive core 40 to decrease. In consideration of the above points, the width of the non-fiber accumulation portion 45 is relative to the length in the transverse direction Y of the absorptive core 40 from the viewpoint of the flexibility of the non-fiber accumulation portion 45 , that is, the ease of forming a crease and the balance of absorption performance. The narrowest part (that is, the width) is preferably 3% or more, more preferably 5% or more, and preferably 30% or less, more preferably 25% or less, and more specifically, preferably 3% or more and 30% or less , more preferably 5% or more and 25% or less.

In addition, the length of the longitudinal direction X of the non-fiber accumulation portion 45 is preferably 25% or more, more preferably 30% or more, and preferably 50% or less, more preferably 45% or less with respect to the length of the longitudinal direction X of the absorptive core 40 , more specifically, it is preferably 25% or more and 50% or less, and more preferably 30% or more and 45% or less.

In addition, as shown in FIG. 2 , in the disposition site of the two non-fiber accumulation parts 45 and 45 in the absorptive core 40, there are fiber accumulation parts 46 on both sides in the lateral direction Y of each non-fiber accumulation part 45, and the fiber accumulation parts The portion 46 contains a larger amount of the core-forming material constituting the absorptive core 40 than the non-fiber accumulation portion 45 . That is, in the absorptive core 40 in the diaper 1, there are a pair of fiber accumulation parts 46 and 46 located at both side edges in the longitudinal direction X of the absorptive core 40 and between the two non-fiber accumulation parts 45 and 45 1 fiber accumulation part 46, a total of three fiber accumulation parts 46, from the viewpoint of taking into account the conformability (the flexibility of the non-fiber accumulation part 45) and the absorption performance, it is preferable to have two non-fiber accumulation parts 45 and 45 In the part where the length (ie width) of the transverse direction Y of the absorbent core 40 is the narrowest in the arrangement part, the ratio of the length (ie width) of the transverse direction Y of the three fiber piling parts 46 is 1:1:1, that is, it is uniform of.

As mentioned above, although this invention was demonstrated, this invention is not limited to the said embodiment, It can change suitably.

For example, in the diaper 1 of the above-described embodiment, the number of non-fiber accumulation parts is two, but in the present invention, the number of non-fiber accumulation parts is not particularly limited. One may be formed, but three or more may be arranged in the horizontal direction. In consideration of the absorption performance of the absorbent core, etc., the number of non-fiber accumulation parts is preferably 1 to 3, and it is particularly preferred that the central part (including the excretion part) in the transverse direction Y of the absorptive core 40 in the crotch part 1M as in the diaper 1 The area of the opposite portion) is arranged with a fiber accumulation portion 46, and two non-fiber accumulation portions 45 and 45 are arranged on both sides of the fiber accumulation portion 46 in the lateral direction Y.

In addition, the absorbent article of the present invention is not limited to the unfolded disposable diaper as in the above-described embodiment, but broadly includes articles (unfolded) for absorbing bodily fluids (urine, menstrual blood, soft stool, sweat, etc.) discharged from the human body type wearing articles), for example, diaper covers, pad holders, etc. are also included.

Regarding the above-described embodiments of the present invention, the following contents are further disclosed.

<1>

An absorbent article having a longitudinal direction extending from a wearer's abdomen to a back side via a crotch portion and a transverse direction perpendicular thereto, and having in the longitudinal direction: a crotch portion disposed in the crotch portion when worn; a ventral portion arranged at a position closer to the wearer's ventral side than the crotch portion; and a back portion arranged at a position closer to the wearer's backside than the crotch portion,

This absorbent article has an absorptive main body including an absorptive core obtained by laminating a core-forming material, and both side edge portions in the longitudinal direction of the absorptive main body in the back side portion so as to extend from A pair of fastening members are fixed to the edge portions on both sides so as to extend laterally outward.

The said absorptive core in the said crotch part is formed with the non-fiber accumulation part extended in the longitudinal direction,

Each of a pair of said snap-fitting members includes: a stretchable side panel fixed to the absorptive main body so as to extend laterally outward from a side edge of the absorptive main body; and a front end portion in an extending direction from the side panel A buckle tape fixed to the side panel in a manner extending laterally outward,

When the said absorptive main body is expanded planarly to be in a developed state and the said side sheet is made into a natural state,

The part of the fixing portion of the side sheet and the absorbent main body that is located at the innermost side in the longitudinal direction and is located at the outermost side in the transverse direction is used as a side sheet fixing point,

Taking the part of the fixing part of the above-mentioned buckle tape and the above-mentioned side panel that is located at the innermost side in the longitudinal direction and the outermost part in the transverse direction as the fixing point of the buckle belt,

When drawing an imaginary straight line L1 passing through the fixing point of the side panel and the fixing point of the buckle tape for a pair of the above-mentioned fastening parts, respectively,

The back longitudinal end of the said non-fiber accumulation part is located in the intersection of the two imaginary straight lines L1 or the vicinity of the intersection, and the non-fiber accumulation part extends longitudinally from the back longitudinal end to the ventral longitudinal end of the absorptive core.

<2>

The absorbent article according to the above <1>, wherein the absorptive main body has a pair of side flaps from the abdominal portion to the back portion from both side edges in the longitudinal direction of the absorptive core The elastic members for forming leg gathers are arranged in an elongated state so as to pass through the crotch portion and extend in the longitudinal direction, respectively, extending outward in the lateral direction, respectively.

When the said absorptive main body is expanded planarly to be in a developed state and the said side sheet is made into a natural state,

The ventral longitudinal end of the elastic member for forming leg gathers of one of the pair of the side flaps and the longitudinal longitudinal end of the elastic member for forming leg gathers of the other are at the same position in the longitudinal direction, When drawing an imaginary straight line L2 that passes through the two ventral longitudinal ends and extends laterally, the ventral longitudinal end of the non-fiber-accumulating portion is located on the imaginary straight line L2, or is located in the vicinity of the imaginary straight line L2 and is smaller than the imaginary straight line L2. The straight line L2 is located near the above-mentioned intersection.

<3>

The absorbent article according to the above <2>, wherein a site near the imaginary straight line L2 and closer to the intersection than the imaginary straight line L2 is in the unfolded state and in the natural state, from the imaginary straight line L2 on the The intersection side is an area within 15% of the total length in the longitudinal direction of the absorptive main body.

<4>

The absorbent article according to any one of the above <1> to <3>, wherein the absorptive main body has a pair of side flaps which extend from the abdominal part to the back part from the absorptive Both side edges in the longitudinal direction of the core extend outward in the lateral direction, respectively, and elastic members for forming leg gathers are arranged on the pair of side flaps in an elongated state so as to pass through the crotch portion and extend in the longitudinal direction, respectively,

When the said absorptive main body is expanded planarly to be in a developed state and the said side sheet is made into a natural state,

The back side longitudinal end of the said elastic member for leg gathers formation is located in the vicinity of each of two said virtual straight lines L1.

<5>

The absorbent article according to the above <4>, wherein the vicinity of the imaginary straight line L1 is in the expanded state and in the natural state, and one side and the other side in the longitudinal direction from the imaginary straight line L1 are the absorptive properties, respectively. The area within 15% of the total length of the longitudinal direction of the main body.

<6>

The absorbent article according to any one of the above <1> to <5>, wherein the length in the longitudinal direction from the back side longitudinal end of the absorptive main body to the intersection of the two imaginary straight lines L1 is the absorbency 30 to 50% of the total length of the longitudinal direction of the main body, preferably 35 to 45%.

<7>

The absorbent article according to any one of the above <1> to <6>, wherein the back-side longitudinal end of the non-fiber accumulation portion is located at the intersection of the two imaginary straight lines L1, or on one side in the longitudinal direction from the intersection and the other side are respectively within the region within 15% of the total length in the longitudinal direction of the above-mentioned absorptive main body.

<8>

The absorbent article according to any one of the above <1> to <7>, wherein the length of the non-fiber accumulation portion in the lateral direction is preferably 3% or more with respect to the portion where the length in the lateral direction of the absorptive core is the narrowest, It is more preferably 5% or more, more preferably 30% or less, and more preferably 25% or less.

<9>

The absorbent article according to any one of the above <1> to <8>, wherein the length in the longitudinal direction of the non-fiber accumulation portion is preferably 25% or more, and more preferably 30% of the length in the longitudinal direction of the absorptive core. % or more, and preferably 50% or less, more preferably 45% or less, more specifically, 25% or more and 50% or less, and more preferably 30% or more and 45% or less.

<10>

The absorbent article according to any one of the above <1> to <9>, wherein, in the absorptive core, a pair of the non-fiber accumulation portions are present at a predetermined interval in the lateral direction, and the pair of A fiber accumulation part exists in a total of three places between the lateral outer side of each of the non-fiber accumulation parts and the pair of non-fiber accumulation parts, and the fiber accumulation part has a larger number of cores constituting the absorptive core than the non-fiber accumulation part. forming material,

The ratio of the width in the lateral direction of the absorptive core in the position where the pair of non-fiber accumulation parts is arranged in the absorptive core is the narrowest, and the width in the transverse direction of the three fiber accumulation parts is 1:1:1, i.e. uniform.

<11>

The absorbent article according to any one of the above <1> to <10>, wherein the non-fiber accumulation portion is a through hole in which a core forming material constituting the absorptive core is not present at all.

<12>

The absorbent article according to any one of the above <1> to <11>, wherein the non-fiber-accumulating portion starts from a position inward in the longitudinal direction of the ventral longitudinal end of the absorptive core in the ventral portion , which are continuously present at a position inward in the longitudinal direction of the back side longitudinal end of the absorptive core via the above-mentioned crotch portion to the above-mentioned back side portion.

<13>

The absorbent article according to any one of the above <1> to <12>, wherein the skin-opposing surface of the absorptive core is covered with a skin-side wrapping sheet, and the non-skin-opposing surface is covered with a non-skin-side wrapping sheet ,

In the said non-fiber accumulation part, the said skin side encapsulation core and the said non-skin side encapsulation core are joined.

<14>

The absorbent article according to the above <13>, wherein the absorptive main body has a surface sheet and a back sheet, and the absorptive core is disposed between the two sheets,

The said skin side chip wrap is bonded to the said surface sheet with an adhesive agent, and the said non-skin side chip chip is bonded to the said back sheet with an adhesive agent.

<15>

The absorbent article according to any one of the above <1> to <14>, wherein the fastener member and the absorptive main body are different members.

<16>

The absorbent article according to any one of the above <1> to <15>, wherein the absorptive core has a single-layer structure.

<17>

The absorbent article according to any one of the above <1> to <16>, wherein the side panel fixing point is positioned on the inner side in the lateral direction rather than the side edge portion in the longitudinal direction of the absorbent main body.

<18>

The absorbent article according to any one of the above <1> to <17>, wherein the fastener tape fixing point is located on the inner side in the lateral direction rather than the side edge portion in the longitudinal direction of the side panel.

Industrial Availability

According to the present invention, there is provided an absorbent article that can fit the wearer's crotch even if no particular attention is paid to the wearing operation, and can be fitted to the crotch of the wearer only by wearing in a usual manner, thereby exhibiting a high leakage prevention effect.

Claims (17)

1. An absorbent article having a longitudinal direction extending from a wearer's abdominal side to a back side via a crotch portion and a transverse direction orthogonal thereto, and having in the longitudinal direction: a crotch portion arranged in the crotch portion when worn a ventral portion arranged at a position closer to the wearer's ventral side than the crotch portion; and a back portion arranged at a position closer to the wearer's backside than the crotch portion, This absorbent article has an absorptive main body including an absorptive core obtained by laminating a core-forming material, and both side edge portions in the longitudinal direction of the absorptive main body in the back side portion, to A pair of fastening members is fixed so as to extend laterally outward from the edge portions on both sides, The absorbent article is characterized by: The absorptive core in the crotch portion is formed with a non-fiber accumulation portion extending in the longitudinal direction, Each of the pair of fastener members includes: a stretchable side panel fixed to the absorptive main body so as to extend laterally outward from a side edge of the absorptive main body; and an extending direction from the side panel. The front end portion is fixed to the buckle tape of the side panel in such a way that the front end extends laterally outward, When the absorptive main body is planarly expanded to be in an expanded state and the side sheet is in a natural state, Using the portion of the side panel that is located at the innermost side in the longitudinal direction and at the outermost side in the transverse direction in the fixing portion of the side panel to the absorbent main body as the side panel fixing point, Taking the portion of the fastener tape that is located at the innermost in the longitudinal direction and the outermost in the lateral direction among the fixing parts of the fastener tape and the side panel as the fixing point of the fastener tape, When drawing an imaginary straight line L1 passing through the fixing point of the side panel and the fixing point of the buckle tape for a pair of the fastener components, The back longitudinal end of the non-fiber-accumulating portion is located at or near the intersection of the two imaginary straight lines L1, and the non-fiber-accumulating portion is in the longitudinal direction from the back longitudinal end to the ventral longitudinal end of the absorptive core. extend, The absorptive main body has a pair of side flaps extending from both side edges in the longitudinal direction of the absorptive core to the outside in the lateral direction from the abdominal portion to the back portion, respectively. The side flaps are respectively provided with elastic members for forming leg gathers in an extended state so as to pass through the crotch portion and extend in the longitudinal direction, respectively, When the absorptive main body is planarly expanded to be in an expanded state and the side sheet is in a natural state, The ventral longitudinal end of the elastic member for forming leg gathers of one of the pair of side flaps and the longitudinal longitudinal end of the elastic member for forming leg gathers of the other are in the longitudinal direction. At the same position, when drawing an imaginary straight line L2 passing through the two ventral longitudinal ends and extending in the lateral direction, the ventral longitudinal end of the non-fiber-accumulating portion is located on the imaginary straight line L2, or is located on the imaginary straight line L2. A portion near the intersection point than the imaginary straight line L2. 2. The absorbent article of claim 1, wherein: The portion near the imaginary straight line L2 and closer to the intersection than the imaginary straight line L2 is in the unfolded state and the natural state, and the absorbent body is on the intersection side from the imaginary straight line L2. The area within 15% of the full length in the vertical direction. 3. The absorbent article of claim 1 or 2, wherein: When the absorptive main body is planarly expanded to be in an expanded state and the side sheet is in a natural state, The back-side longitudinal end of the said elastic member for leg gathers formation is located in the vicinity of each of two said virtual straight lines L1. 4. The absorbent article of claim 3, wherein: The vicinity of the imaginary straight line L1 is in the unfolded state and the natural state, and one side and the other side in the longitudinal direction from the imaginary straight line L1 are 15% of the total length in the longitudinal direction of the absorptive main body, respectively. area within. 5. The absorbent article of claim 1 or 2, wherein: The length along the longitudinal direction from the back side longitudinal end of the said absorptive main body to the intersection of two said virtual straight lines L1 is 30 to 50% of the total length of the longitudinal direction of this absorptive main body. 6. The absorbent article of claim 1 or 2, wherein: The back-side longitudinal end of the non-fiber-accumulating portion is located at the intersection of the two imaginary straight lines L1, or one side and the other side in the longitudinal direction from the intersection are 15 times the total length of the absorbent body in the longitudinal direction, respectively. % within the area. 7. The absorbent article of claim 1 or 2, wherein: The length in the transverse direction of the non-fiber accumulation portion is 3% or more and 30% or less at the portion where the length in the transverse direction of the absorptive core is the narrowest. 8. The absorbent article of claim 1 or 2, wherein: The length of the longitudinal direction of the said non-fiber accumulation part is 25% or more and 50% or less of the length of the longitudinal direction of the said absorptive core. 9. The absorbent article of claim 1 or 2, wherein: In the above-mentioned absorptive core, a pair of the non-fiber accumulation portions are present at predetermined intervals in the lateral direction, and the total amount between the lateral outer sides of the pair of non-fiber accumulation portions and the pair of non-fiber accumulation portions is There are three fiber accumulation parts, and the fiber accumulation part has a larger amount of the core-forming material constituting the absorptive core than the non-fiber accumulation part, In the absorptive core, among the positions where the pair of non-fiber accumulation parts are arranged, the width in the transverse direction of the absorptive core is the narrowest, and the width in the transverse direction of each of the fiber accumulation parts at the three positions is the width. The ratio is 1:1:1, which is uniform. 10. The absorbent article of claim 1 or 2, wherein: The said non-fiber accumulation part is a through-hole in which the core formation material which comprises the said absorptive core does not exist at all. 11. The absorbent article of claim 1 or 2, wherein: The said non-fiber-accumulating part is from a position on the inner side in the longitudinal direction of the ventral longitudinal end of the absorptive core, and is more absorptive than the back part via the crotch part. The backside longitudinal end of the core is continuously present at the inner side in the longitudinal direction. 12. The absorbent article of claim 1 or 2, wherein: The skin-opposite surface of the absorbent core is covered by the skin-side encapsulation chip, and the non-skin-opposite surface is encapsulated by the non-skin-side encapsulation chip, In the non-fiber accumulation portion, the skin-side encapsulation chip is bonded to the non-skin-side encapsulation chip. 13. The absorbent article of claim 12, wherein: The absorptive main body has a surface sheet and a back sheet, and the absorptive core is arranged between the two sheets, The said skin-side chip wrap is bonded to the front sheet with an adhesive, and the non-skin-side chip wrap is bonded to the back sheet with an adhesive. 14. The absorbent article of claim 1 or 2, wherein: The said fastener member and the said absorptive main body are a different member. 15. The absorbent article of claim 1 or 2, wherein: The absorbent core is of a single layer construction. 16. The absorbent article of claim 1 or 2, wherein: The said side panel fixing point is located in the lateral inner side rather than the side edge part in the longitudinal direction of the said absorptive main body. 17. The absorbent article of claim 1 or 2, wherein: The said fastener tape fixing|fixed point is located in the lateral inner side rather than the side edge part in the longitudinal direction of the said side panel.

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