JP5159358B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article attached to a body so as to cover the crotch.

Many absorbent articles such as sanitary napkins, panty liners, incontinence pads, disposable paper diapers, absorbent bodies made of cotton-like pulp, surface side layers such as liquid-permeable surface sheets that cover the surface of absorbent bodies, and absorption In order to prevent wrinkles and misalignment of each part, the front side layer and the back side layer are respectively attached to the front and back of the absorber with an adhesive. It is generally fixed.
On the other hand, in order to improve adhesion to the body and prevent transmission leakage, a structure in which the absorber and its front side layer are floated with respect to the back side layer has also been proposed (see, for example, Patent Documents 1 to 3). .
Japanese National Patent Publication No. 9-507033 JP-A-11-99170 JP-A-11-99171

However, by simply increasing the adhesion, when a low-viscosity liquid is rapidly excreted (typically urination, if it is excreted in a large amount and a certain amount of time), there is a gap between the body and the article. Since there are few, the escape place of unabsorbed liquid disappears and there existed a problem that it was easy to generate | occur | produce a leak.
Then, the main subject of this invention is to make the adhesiveness to a body compatible with the leak prevention performance with respect to rapid excretion.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In an absorbent article that has an absorbent body, a liquid-permeable surface side layer that covers the surface of the absorbent body, and a back surface side layer that covers the back surface of the absorbent body, and is worn on the body so as to cover the crotch,
The absorber and the surface side layer are integrated to form a composite layer,
Of the annular part including the peripheral part of the composite layer and the main absorbent part surrounded by the annular part, the annular part is joined to the back side layer, and the main absorbent part is not joined to the back side layer,
The length of the main absorbent portion in the front-rear direction is longer than the natural length in the front-rear direction of the portion corresponding to the main absorbent portion in the back side layer, and thereby the main absorbent portion is lifted from the back side layer and is on the body side And a storage space for absorbing liquid is formed between the main absorbent portion and the back side layer,
A through-hole penetrating the absorber in the vertical direction is formed in a portion corresponding to the storage space in the main absorbent portion.
An absorbent article characterized by the above.

(Function and effect)
In the present invention, of the composite layer formed by integrating the absorber and the front side layer, the annular part including the peripheral part is joined to the back side layer, and the main absorbent part surrounded by the annular part is the back side layer. And the length of the main absorbent portion in the front-rear direction (deployed state) is longer than the natural length in the front-rear direction of the portion corresponding to the main absorbent portion in the back side layer. It floats up and bulges to the body side. Therefore, not only the main absorbent portion is in close contact with the body surface, but also a storage space for absorbing liquid is formed between the main absorbent portion and the back side layer. In the present invention, a through-hole penetrating in the vertical direction is formed in the absorber in the main absorbent portion, and this through-hole communicates with the storage space. Therefore, the rapidly excreted liquid is passed through the through-hole. And quickly introduced into the storage space. Therefore, according to the present invention, the adhesion to the body and the leakage prevention performance against rapid excretion are compatible. Moreover, although it was not initially anticipated, in the present invention, due to body movement and body weight, the space under the main absorption part is crushed and restored, so that the air inside the space is replaced through the through-hole, and stuffy and anaerobic bacteria The effect of reducing the breeding of is also demonstrated.

<Invention of Claim 2>
The length of the main absorbent portion in the front-rear direction is 30 mm or more, the natural length in the front-rear direction of the portion corresponding to the main absorbent portion in the back side layer is 15 mm or more, and the length of the main absorbent portion in the front-rear direction is 1.1 or more times the natural length in the front-rear direction of the portion corresponding to the main absorption portion in the side layer,
The cross-sectional area of the through hole is 3 mm ² or more, and 9 to 81 through holes are formed per 3 cm square of the absorber.
The absorbent article according to claim 1.

(Function and effect)
The size of each part in the present invention can be determined as appropriate, but it is particularly advantageous that the effects of the present invention described above are exhibited if it is within the range described in this section.

<Invention of Claim 3>
The absorbent article of Claim 1 or 2 comprised so that the said back surface side layer may elastically expand-contract at least in the front-back direction.

(Function and effect)
By having such a structure, after joining the composite layer to the front surface side in a state where the back side layer is stretched in the front-rear direction, the structure of the present invention described above is formed simply by releasing the stretching force. There is an advantage that manufacture becomes easy.

<Invention of Claim 4>
The shape corresponding to the main absorbent portion in the back side layer is extended to the length in the front-rear direction of the main absorbent portion, and the shape is maintained on the back side of the back side layer against the shrinkage force of the back side layer. The absorbent article of Claim 3 which affixes a sheet | seat so that peeling is possible.

(Function and effect)
By providing such a shape-holding sheet, the bulging structure of the present invention described above is naturally formed by peeling the shape-holding sheet when in use, while having a flat shape when not in use. Therefore, it can be carried in a compact state and is easy to use.

<Invention of Claim 5>
The absorptivity of Claim 3 or 4 which has a part where the force required for compression of the front-back direction is lower than another site | part in the both sides corresponding to the said main absorption part in the front-back direction among the cyclic | annular parts of the said composite layer. Goods.

(Function and effect)
By having such a structure, the shrinkage of the back side layer is not hindered, and the composite layer has a stable bulging shape.

<Invention of Claim 6>
The absorptive article according to any one of claims 1 to 5 in which easy-bending parts are formed along the front-rear direction on both sides in the width direction of the main absorbent part in the composite layer.

(Function and effect)
The easy bending portion means a portion where the portion is easily bent as compared with other portions. If such easy-bending parts are formed along the front-rear direction on both sides in the width direction of the main absorbent part in the composite layer, both sides of the main absorbent part are stable when a compressive force in the width direction is applied between the crotch Thus, there is an advantage that the bulging shape can be maintained and the adhesion to the body is hardly impaired.

<Invention of Claim 7>
On the both sides in the width direction of the composite layer, at least elongated elastic stretch members that are substantially continuous from the front end portion to the rear end portion of the main absorbent portion are respectively provided in a state of extending in the longitudinal direction. The absorptive article according to any one of claims 1 to 6, wherein the stretchable member is disposed such that a middle portion in the front-rear direction bulges outward in the width direction from portions on both sides of the front-rear direction.

(Function and effect)
When the elongated elastic member having such an arrangement is provided, the region where the bulge portion in the middle of the elongated elastic member in the front-rear direction of the composite layer is located in the composite layer due to the contraction is wider than the front and rear regions. Shrink in the direction. As a result, both side portions of the main absorbent portion have a naturally stable bulging shape, and the bulging shape is maintained elastically, so that the adhesiveness to the body is excellent. Further, by utilizing this shrinkage in the width direction, it is possible to form a constriction on both sides in the width direction of the absorbent article. In this case, the shape is suitable for the crotch, and the compression force in the width direction is difficult to act. Therefore, the shape stability is further improved. Further, such an arrangement of the elongated elastic member has an advantage that it can be manufactured in-line by a so-called rocking device.

<Invention of Claim 8>
The absorbent article of any one of Claims 1-7 which has a lower absorber spaced apart from the said main absorption part to the back surface side between the said composite layer and the said back surface side layer.

(Function and effect)
If there is no portion that absorbs and holds the liquid between the composite layer and the back side layer, the excreted liquid introduced into the storage space may return to the body side through the through hole. Therefore, it is desirable to provide a lower absorbent body as described in this section, hold the excretory fluid introduced into the storage space with the lower absorbent body, and prevent reversal.

<Invention of Claim 9>
The absorption according to any one of claims 1 to 8, wherein a liquid-permeable compression-recoverable layer that is not fixed to the main absorbent portion is provided between the composite layer and the back side layer. Sex goods.

(Function and effect)
If the space is nothing between the composite layer and the back side layer, the above-described bulging shape of the present invention may be crushed and the adhesion may be impaired. Therefore, it is desirable to provide a liquid-permeable compression-restorable layer as described in this section to prevent the bulging shape from being crushed. In addition, compression decompression | restoration means what is decompress | restored completely although it is compressed by pressure, or is decompress | restored although it is incomplete.

<Invention of Claim 10>
The absorbent body has a region in which a plurality of through holes are provided only in the middle in the front-rear direction and in the middle in the width direction, and at least one of hydrophilicity and fiber density increases from this region toward the periphery. The absorbent article according to any one of claims 1 to 9.

(Function and effect)
By having such a structure, since the liquid introduced in the through-hole region of the absorber is diffused to the surrounding non-through-hole region without being held in the region, the liquid once absorbed is difficult to return to the body side. Become. In addition, since the liquid is unlikely to remain in the part that is more closely attached to the skin, there is also an advantage that the surface becomes dry even after absorption of the liquid.

  As described above, according to the present invention, there are advantages such as being able to achieve both adhesion to the body and leakage prevention performance against rapid excretion.

  Hereinafter, embodiments of the present invention will be described with reference to an example of a pad-type absorbent article (hereinafter simply referred to as a pad), but the present invention is not limited to this and is also applicable to other absorbent articles. Needless to say, it can be done.

  1 to 4 show a developed state of the pad 1 according to the present invention. The pad 1 is provided between a back sheet 2 and a liquid-permeable surface sheet 3 (hereinafter simply referred to as a surface sheet). It has a structure in which the absorber 4 is interposed.

  As the back sheet 2, a sheet material having water shielding properties such as polyethylene and polypropylene is generally used. However, when the pad 1 is used with being interposed between the diaper and the crotch, a liquid-permeable material is used as necessary. Can also be used. As the sheet having water-impervious properties, a non-woven sheet having a substantially impervious property with a waterproof film interposed (in this case, the back sheet 2 is composed of the waterproof film and the non-woven fabric), polyethylene or polypropylene A microporous water-impervious and moisture-permeable sheet obtained by melt-kneading an inorganic filler in an olefin-based resin or the like to form a sheet and then stretching in a uniaxial or biaxial direction is also preferably used.

As the surface sheet 3, a perforated or non-porous nonwoven fabric or a porous plastic film sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. As the plastic film sheet, for example, olefin resins such as polyethylene and polypropylene, polyamide resins such as polyester and nylon, ethylene-vinyl acetate copolymer (EVA), and the like can be preferably used. The nonwoven fabric preferably has a fiber basis weight of about 8 to 50 g / m ² and a thickness of about 0.2 to ² mm.

  On the other hand, the absorber 4 interposed between the back sheet 2 and the top sheet 3 is, for example, a mixture of a superabsorbent resin in pulp or a mixture of chemical fibers in a pulp and a superabsorbent resin. Mixed materials are used. A filament aggregate such as cellulose acetate or a non-woven fabric mixed with a superabsorbent resin is also suitable. Superabsorbent resin and pulp can be omitted. Pulp includes cellulose fibers such as chemical pulp and molten pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of

  Examples of the highly water-absorbing resin include polyacrylate cross-linked products, self-crosslinked polyacrylates, saponified acrylate-vinyl acetate copolymer cross-linked products, cross-linked isobutylene / maleic anhydride copolymer, polysulfone Examples include cross-linked acid salts, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. A highly water-absorbing resin having water absorption performance can adjust the water absorption force and the water absorption speed by adjusting the crosslinking density and the crosslinking density gradient in the production process. The content of the superabsorbent resin is desirably 10 to 60%. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

  The absorbent body 4 can be surrounded and surrounded by a liquid-permeable material, for example, a wrapping sheet (not shown) made of crepe paper, non-woven fabric, or the like, in order to maintain the shape. Further, an intermediate sheet 7 can be disposed between the top sheet 3 and the absorber 4. The intermediate sheet 7 preferably has hydrophilicity. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. The fiber which surface-treated with the hydrophilizing agent and provided the hydrophilic property can be used. By disposing such an intermediate sheet 7, it is possible to prevent body fluid once absorbed by the absorbent body 4 from returning to the topsheet 3 side.

  Characteristically, the absorber 4 and the surface sheet 33 are bonded together to form the composite layer 20, and the annular part 21 including the peripheral part of the composite layer 20 and the main absorbent part 22 surrounded by the annular part 21 are annular parts. 21 is bonded to the back sheet 2, and the main absorbent portion 22 is not bonded to the back sheet 2. This joining can be performed by a joining means such as a hot melt adhesive HM (the same applies to other shaded portions in the figure). Although the dimension of each part can be determined suitably, it is preferable that the length L1 of the main absorption part 22 in the front-rear direction is 30 mm or more, particularly 50 to 150 mm. The natural length L2 in the front-rear direction of the portion corresponding to the main absorbent portion 22 in the back sheet 2 (the portion surrounded by the joint portion with the main absorbent portion 22) is preferably 15 mm or more, and particularly preferably 20 to 60 mm. In addition, the longitudinal length L1 of the main absorbent portion 22 is longer than the natural length L2 in the longitudinal direction of the portion corresponding to the primary absorbent portion 22 in the backsheet 2. Specifically, the length L1 in the front-rear direction of the main absorbent portion 22 is at least 1.1 times the natural length L2 in the front-rear direction of the portion corresponding to the main absorbent portion 22 in the backsheet 2, particularly 1.3-2. It is preferably 0 times.

Also, characteristically, the absorber 4 in the main absorbent portion 22 is formed with a through hole 5 penetrating in the vertical direction. The size and number of the through holes 5 may be determined as appropriate, but the through holes 5 are preferably cylindrical with a cross-sectional area of 3 mm ² or more, and 9 to 81 are formed per 3 cm square of the absorber 4. Is preferred. The formation region of the through-hole 5 can also be determined as appropriate, and can be the entirety of the absorber 4, but can also be a part. In a normal case, it is preferable to have a region in which a plurality of through-holes 5 are provided only in the middle in the front-rear direction and the width direction of the absorber 4. The arrangement of the through-holes 5 when viewed in plan in a state where the absorber 4 is unfolded may be irregular, but is preferably provided regularly, and in particular, a staggered arrangement as in the illustrated example, Although not shown, a matrix arrangement is preferable.

  As described above, the peripheral annular portion 21 of the composite layer 20 is joined to the back sheet 2, and the main absorbent portion 22 surrounded by the annular portion 21 is not joined to the back sheet 2, and the main absorbent portion 22 When the length in the front-rear direction is longer than the natural length in the front-rear direction of the portion corresponding to the main absorbent portion 22 in the back sheet 2, the main absorbent portion 22 rises from the back sheet 2 and bulges to the body side as shown in FIG. To do. Therefore, not only the main absorbent portion 22 is in close contact with the body surface, but also a storage space for the absorbing liquid between the main absorbent portion 22 and the back sheet 2 (in the illustrated example, a portion having the compression-recoverable layer 10 described later). Is formed. Moreover, since the through-hole 5 penetrating in the vertical direction is formed in the absorbent body 4 in the main absorbent portion 22 and this through-hole 5 communicates with the storage space, the rapidly excreted liquid is passed through the through-hole 5. Immediately introduced into the storage space. Therefore, it becomes difficult to leak even for rapid excretion while improving adhesion to the body.

  In particular, when the back sheet 2 is made of a material that elastically expands and contracts at least in the front-rear direction, only the tensile force is released after the composite layer 20 is bonded to the surface side in a state where the back sheet 2 is stretched in the front-rear direction. Since the structure of the present invention described above is formed, there is an advantage that manufacture is easy. As such an elastic stretch material, a film or nonwoven fabric of a siloxane-based or urethane-based elastomer having a stretch rate of about 10 to 50%, a composite material of an inelastic nonwoven fabric and an elastic member, or the like is used.

Thus, when the back surface sheet 2 is comprised with the elastic elastic material, in the state which extended the part corresponding to the main absorption part 22 in the back surface sheet 2 to the front-back direction length of the main absorption part 22, This is a preferable embodiment in which a shape-retaining sheet 6 that resists the shrinkage force of the back sheet 2 is detachably attached to the back surface. By providing such a shape-holding sheet 6, the above-described bulging structure is naturally formed as shown in FIG. 6 by peeling the shape-holding sheet 6 during use, while being flat when not in use. Become so. Therefore, it can be carried in a compact state and is easy to use. The shape maintaining sheet 6 can be used without particular limitation as long as it is a material that is rigid enough to maintain the shape against the shrinkage force of the back sheet 2, but for example, it has been given release by silicon processing. High-quality paper having a basis weight of 35 g / m ² or more can be used. In general, pad 1 type absorbent articles such as sanitary napkins are generally coated with an adhesive for preventing misalignment on the back surface, and a release sheet is attached to cover the adhesive layer. The shape-holding sheet 6 described above can also be used as such a release sheet. That is, the shape maintaining sheet 6 can be detachably fixed to the back surface of the pad 11 by the adhesive ad for preventing misalignment applied to the back surface of the pad 11.

  Further, as shown in the drawing, on each side of the composite layer 20 in the width direction, at least the elongated elastic elastic members 8 substantially continuous from the front end portion to the rear end portion of the main absorbent portion 22 are stretched in the longitudinal direction, respectively. The elongated elastic elastic member 8 is provided so that the middle part in the front-rear direction bulges outward in the width direction from the parts on the both sides in the front-rear direction (however, preferably within the range of the main absorbent portion 22). Arrangement is also a preferred form. More specifically, the bulging portion in the middle in the front-rear direction of the elongated elastic expansion / contraction member 8 is formed in an arc shape at a position overlapping with all (or part of) the hole 5 formation region in the front-rear direction of the pad 11. The front and rear side portions are linearly arranged along the front-rear direction. In this case, the hole 5 formation region in the composite layer 20 contracts in the width direction with respect to the region before and after the contraction of the bulging arrangement portion of the elongated elastic elastic member 8. As a result, both side portions of the main absorbent portion 22 have a naturally stable bulging shape, and since this bulging shape is elastically maintained, the adhesiveness to the body is excellent. In addition, the shrinkage in the width direction forms a constriction along the legs around both sides of the pad 1 in the width direction, and improves the fit to the crotch, thereby making it difficult for the compression force in the width direction to act. The sex becomes even more. Such an arrangement of the elongated elastic elastic member 8 can be manufactured in-line by a so-called rocking device.

  As the elongated elastic elastic member 8, natural rubber, synthetic rubber, foamed resin, scrim, etc., which are formed in an elongated shape such as a thread shape, a string shape, or a belt shape can be used. When using synthetic thread rubber, it is preferable to fix one having a thickness of about 400 to 1500 dtex in a stretched state of 110 to 250%.

  On the other hand, if there is no portion that absorbs and holds the liquid between the composite layer 20 and the back sheet 2, the excreted liquid introduced into the storage space may return to the body side through the through-hole 5. Therefore, as shown in the figure, a lower absorbent body 9 is provided between the composite layer 20 and the backsheet 2 so as to be separated from the main absorbent portion 22 toward the backside, and the excretory liquid introduced into the storage space is disposed in the lower absorbent body 9. It is desirable to hold it in order to prevent reversal. The lower absorbent body 9 may be fixed to the back sheet 2 by a bonding means such as a hot melt adhesive, or may not be fixed. In the illustrated example, the length and width of the lower absorbent body 9 are the same as those of the absorbent body 4 of the composite layer 20 and the positions of the peripheral edges overlap. However, the present invention is not limited to this. It can be shortened or lengthened. When the back sheet 2 has elasticity, the lower absorbent body 9 preferably has a lower force required for stretching than the back sheet 2.

  In addition, if the space between the composite layer 20 and the back sheet 2 is empty, the above-described bulging shape of the present invention may be crushed and the adhesion may be impaired. In between, it is desirable to provide the liquid-permeable compression-restorable layer 10 which is not fixed to the main absorbent portion 22 to prevent the bulging shape from being crushed. Such a compressive-restorable layer 10 can be formed of an air-through nonwoven fabric or a filament tow of cellulose acetate or the like that is opened as necessary. The compression-recoverable layer 10 can be unfixed to either the composite layer 20 or the back sheet 2 as long as the function of the present invention is not impaired, but is fixed to one or both (especially only the back sheet 2). It is preferable. The thickness of the compression-recoverable layer 10 may be determined as appropriate and may be such that it just contacts the back surface of the composite layer 20 or is sandwiched between the composite layer 20 and the back sheet 2 in a compressed state. There may be a gap between the back surface of the composite layer 20 or the surface of the back sheet 2 as long as the shape that should be ensured as a minimum as the protruding shape can be maintained. Specifically, the thickness of the compression-restorable layer 10 is preferably about 5 to 90% of the gap (thickness direction) between the composite layer 20 and the back sheet 2 in the natural state.

<Other embodiments>
(A) In the above example, the surface side layer of the present invention is configured only by the surface sheet 33, and the back surface side layer of the present invention is configured only by the back surface sheet 2, but has other members such as an intermediate sheet. When the member is located on the front side with respect to the absorbent body 4 (including the covering sheet), it can be configured as a part or all of the front side layer, and when located on the back side, the back side It can be configured as part or all of the layer. For example, in the form having the above-described intermediate sheet, the top sheet 33 and the intermediate sheet can be integrated with the absorbent body 4 as a surface side layer.

(B) As shown in FIG. 7, it is also a preferable embodiment to form easy-bending portions 7 along the front-rear direction on both sides in the width direction of the main absorbent portion 22 in the composite layer 20. The easy bending part 7 means a part where the part is more easily bent than other parts, and can be formed by perforation, slits, embossing or the like. When such an easy-bending portion 7 is formed along the front-rear direction on both sides in the width direction of the main absorbent portion 22 in the composite layer 20, when a compressive force in the width direction is applied between the crotch, the main absorbent portion 22 Both sides can maintain a stable bulging shape, and adhesion to the body is difficult to be impaired. It is preferable that the easily bent portion 7 is formed along both side edges of the main absorbent portion 22 or the vicinity of the center in the width direction thereof.

(C) When the back surface side layer (back surface sheet 2) is configured to elastically expand and contract in the front-rear direction, among the annular portions 21 of the composite layer 20, on both side portions corresponding to the main absorbent portion 22 in the front-rear direction, If there is a portion where the force required for compression in the front-rear direction is lower than other portions, the shrinkage of the back side layer is not hindered, and the composite layer 20 has a stable bulging shape. As shown in FIG. 8, such a portion is provided with a notch 4x in the target portion of the absorber 4, a slit in the target portion, embossing on the target portion, and a surface side layer in the target portion. And the absorber 4 can be formed intermittently (that is, non-bonded portions are provided intermittently).

(D) It is preferable that the absorbent body 4 has at least one of the hydrophilicity and the fiber density that increases from the formation region of the through-hole 5 toward the surrounding non-through-hole region. FIG. 9 shows this form, and expresses hydrophilicity and fiber density by gradation. By having such a structure, the liquid introduced in the through-hole 5 region of the absorber 4 is diffused to the surrounding non-through-hole region without being held in the region, so that the liquid once absorbed returns to the body side. It becomes difficult to do. In addition, since the liquid is unlikely to remain in the part that is more closely attached to the skin, there is also an advantage that the surface becomes dry even after absorption of the liquid. The degree of hydrophilicity can be created by selecting the material of each part or using a known hydrophilic agent, and the fiber density can be created by selecting the material of each part or compressing it with a nip roll or the like during manufacturing. be able to.

  The present invention can be applied to a wide range of uses such as sanitary napkins, panty liners, cage sheets, and incontinence pads.

It is a top view in the unfolded state of a pad. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a top view in the natural state of a pad. It is the DD sectional view taken on the line of FIG. It is a top view in the development state of other pads. It is a top view in the development state of other composite layers. It is a top view in the development state of other absorbers.

  DESCRIPTION OF SYMBOLS 1 ... Pad, 2 ... Back surface sheet, 3 ... Surface sheet, 4 ... Absorber, 5 ... Through-hole, 6 ... Shape retention sheet, 7 ... Easily bending part, 8 ... Elongated elastic expansion-contraction member, 9 ... Lower absorber, DESCRIPTION OF SYMBOLS 10 ... Compression restoring layer, 20 ... Composite layer, 21 ... Ring part, 22 ... Main absorption part.

Claims (10)

In an absorbent article that has an absorbent body, a liquid-permeable surface side layer that covers the surface of the absorbent body, and a back surface side layer that covers the back surface of the absorbent body, and is worn on the body so as to cover the crotch,
The absorber and the surface side layer are integrated to form a composite layer,
Of the annular part including the peripheral part of the composite layer and the main absorbent part surrounded by the annular part, the annular part is joined to the back side layer, and the main absorbent part is not joined to the back side layer,
The length of the main absorbent portion in the front-rear direction is longer than the natural length in the front-rear direction of the portion corresponding to the main absorbent portion in the back side layer, and thereby the main absorbent portion is lifted from the back side layer and is on the body side And a storage space for absorbing liquid is formed between the main absorbent portion and the back side layer,
A through-hole penetrating the absorber in the vertical direction is formed in a portion corresponding to the storage space in the main absorbent portion.
An absorbent article characterized by the above. The length of the main absorbent portion in the front-rear direction is 30 mm or more, the natural length in the front-rear direction of the portion corresponding to the main absorbent portion in the back side layer is 15 mm or more, and the length of the main absorbent portion in the front-rear direction is 1.1 or more times the natural length in the front-rear direction of the portion corresponding to the main absorption portion in the side layer,
The cross-sectional area of the through hole is 3 mm ² or more, and 9 to 81 through holes are formed per 3 cm square of the absorber.
The absorbent article according to claim 1.   The absorbent article of Claim 1 or 2 comprised so that the said back surface side layer may elastically expand-contract at least in the front-back direction.   The shape corresponding to the main absorbent portion in the back side layer is extended to the length in the front-rear direction of the main absorbent portion, and the shape is maintained on the back side of the back side layer against the shrinkage force of the back side layer. The absorbent article of Claim 3 which affixes a sheet | seat so that peeling is possible.   The absorptivity of Claim 3 or 4 which has a part where the force required for compression of the front-back direction is lower than another site | part in the both sides corresponding to the said main absorption part in the front-back direction among the cyclic | annular parts of the said composite layer. Goods.   The absorptive article according to any one of claims 1 to 5 in which easy-bending parts are formed along the front-rear direction on both sides in the width direction of the main absorbent part in the composite layer.   On the both sides in the width direction of the composite layer, at least elongated elastic stretch members that are substantially continuous from the front end portion to the rear end portion of the main absorbent portion are respectively provided in a state of extending in the longitudinal direction. The absorptive member according to any one of claims 1 to 6, wherein the stretchable member is arranged such that a portion located in the middle in the front-rear direction swells outward in the width direction relative to a portion located on both sides in the front-rear direction. Goods.   The absorbent article of any one of Claims 1-7 which has a lower absorber spaced apart from the said main absorption part to the back surface side between the said composite layer and the said back surface side layer.   The absorption according to any one of claims 1 to 8, wherein a liquid-permeable compression-recoverable layer that is not fixed to the main absorbent portion is provided between the composite layer and the back side layer. Sex goods.   The absorbent body has a region in which a plurality of through holes are provided only in the middle in the front-rear direction and in the middle in the width direction, and at least one of hydrophilicity and fiber density increases from this region toward the periphery. The absorbent article according to any one of claims 1 to 9.

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