JP2019154650A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which rapidly diffuses a body fluid in an absorber and reduces anxiety about leakage. An absorbent body having a substantially elongated body having a liquid-permeable front surface sheet, an impermeable back surface sheet, and an absorber provided between the front surface sheet and the back surface sheet. The absorber is an article, and the absorber has a back surface side absorber layer arranged on the back surface sheet side and a front surface side absorber layer arranged on the front surface sheet side, and the back surface side absorber layer is a product. It has a pair of strip-shaped high-density portions extending in the substantially longitudinal direction, and the width between the pair of strip-shaped high-density portions is 10 to 30 mm in the crotch-corresponding region corresponding to the crotch of the wearer at the time of wearing. [Selection diagram] Fig. 1

Description

  The present invention relates to an absorbent article.

  Conventionally, as an absorbent article such as a panty liner, a sanitary napkin, an incontinence pad, an article having an absorbent body interposed between a liquid-permeable top sheet and a liquid-impervious back sheet is known.

  In such an absorbent article, a configuration is known in which the density of the absorbent body is changed depending on the location in order to control the transfer of the absorbed body fluid. For example, in Patent Document 1, an absorbent core (absorber) includes a pair of side regions, a pair of high-density regions that are located on the center side in the width direction than the side regions and have a higher density than the side regions, A configuration is described having a central low density region located between a pair of high density regions and having a lower density than the high density region.

JP 2017-86622 A

  In the configuration of Patent Document 1, the liquid taken into the region between the high density regions can be diffused into the high density region. However, since the high-density region is formed directly under the surface sheet, diffusion of body fluid is easily visible from the surface. This may give the user anxiety about leakage.

  In view of the above points, an object of one embodiment of the present invention is to provide an absorbent article that can quickly diffuse body fluid in an absorbent body and reduce anxiety about leakage.

  A first aspect of the present invention is a substantially elongated main body having a liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body provided between the top sheet and the back sheet. The absorbent body has a back surface side absorber layer disposed on the back sheet side and a front surface side absorber layer disposed on the top sheet side, and the back surface side. The absorber layer has a pair of belt-like high-density portions extending substantially in the longitudinal direction, and the width between the pair of belt-like high-density portions is 10 to 30 mm in a crotch corresponding region corresponding to the wearer's crotch at the time of wearing. is there.

  According to said 1st form, an absorber has a back surface side absorber layer and a surface side absorber layer, and it has a space | interval of 10-30 mm in a crotch corresponding area | region in the back surface side absorber layer by the side of a back surface sheet. A pair of strip-shaped high-density parts arranged at intervals are provided. Therefore, the bodily fluid discharged to the bodily fluid discharge port corresponding part reaches the absorber through the top sheet and is drawn from the relatively low density portion to the belt-like high density portion of the back side absorbent layer by capillary action. And, since the shape of the belt-like high-density portion is a belt-like shape extending in the longitudinal direction in plan view, the drawn body fluid is guided along the belt-like high-density portion to the front and rear of the absorber, and diffused. Can be made.

  Further, since the belt-like high density portion is provided in the back-side absorbent layer, the diffusion of the body fluid along the belt-like high density portion is difficult to see from the surface side. Therefore, the anxiety about the leak which a user can feel when seeing the surface of an absorbent article can be reduced.

  In the second embodiment of the present invention, the rear end portion and the front end portion of the pair of belt-shaped high-density portions are curved outward in the width direction.

  According to said 2nd form, the bodily fluid drawn in to the strip | belt-shaped high density part can be diffused diagonally forward and diagonally back of an absorber, and an absorber can be utilized efficiently.

  In the third aspect of the present invention, the pair of belt-like high density portions includes a pair of front belt-like high density portions and a pair of rear belt-like high density portions, and the pair of front belt-like high density portions. A rear end portion and a front end portion of the pair of rear belt-like high density portions are in the crotch region, and a rear end portion of the pair of front belt-like high density portions and the pair of rear belt-like high density portions. The distance in the longitudinal direction from the front end of the part is 10 to 40 mm.

  According to the third aspect, since the pair of belt-like high-density parts are divided into the front and the rear, the part where the high-density part is provided is reduced in the body fluid discharge port corresponding part and the vicinity thereof. Can do. For this reason, the softness of the absorber can be maintained in the body fluid discharge port corresponding part and the vicinity thereof, and the wearing feeling can be improved.

  In the fourth embodiment of the present invention, the rear end portions of the pair of front belt-like high density portions and the front end portions of the pair of rear belt-like high density portions are curved inward in the width direction.

  According to the fourth embodiment, the rear end portion of the front belt-shaped high-density portion and the front end portion of the rear belt-shaped high-density portion are oriented so as to face the body fluid discharge port corresponding portion, and the body fluid discharge port corresponding portion It is approaching. Therefore, the bodily fluid discharged | emitted by the bodily fluid discharge port corresponding | compatible part and its vicinity can be rapidly drawn in from the rear-end part of a front belt-shaped high-density part and the front-end part of a belt-shaped high density part of back.

  In the fifth embodiment of the present invention, the width of the band-shaped high density portion is 5 to 25 mm.

  According to the said 5th form, a body fluid can be appropriately induced | guided | derived to a longitudinal direction in an absorber because a pair of strip | belt-shaped high density part has a predetermined | prescribed width | variety. Moreover, it can prevent that the area of a high-density part becomes large too much, and the rigidity of an absorber increases, and a favorable mounting feeling can also be ensured.

  In the sixth aspect of the present invention, the pair of band-shaped high-density parts are formed by pressing.

  According to the said 6th form, since a high-density part can be formed, making the basic weight of an absorber uniform, it can manufacture with few processes.

  In the seventh aspect of the present invention, the surface-side absorber layer has a body fluid guiding portion, and the body fluid guiding portion overlaps the pair of band-shaped high-density portions in a plan view in the crotch corresponding region. .

  According to the seventh embodiment, the body fluid can be guided in the upper layer of the absorber by the body fluid guiding portion of the surface side absorber layer on the surface sheet side of the absorber. In addition, when the body fluid guiding portion of the front surface side absorber layer overlaps the belt-like high density portion of the back surface side absorber layer in plan view, the body fluid drawn into the body fluid guiding portion of the surface side absorber layer can be quickly It can be drawn into the belt-like high density portion of the back side absorber layer and guided in the longitudinal direction.

  In an eighth aspect of the present invention, the main body is provided with a pair of main body pressing grooves extending in the longitudinal direction, which are recessed from the top sheet side to the back sheet side, and the pair of main body pressing grooves are In the crotch region, the pair of belt-shaped high-density portions are disposed on the inner side in the width direction than the outer edge in the width direction.

  According to the eighth aspect, since the position of the main body pressing groove (fit embossing) is on the inner side from the outer edge in the width direction of the pair of belt-shaped high density portions, the absorber is moved along the main body pressing groove. The absorbed body fluid can be prevented from diffusing to the outside in the width direction of the belt-shaped high-density portion and easily leaking.

  According to one embodiment of the present invention, it is possible to provide an absorbent article that can quickly diffuse body fluid in an absorbent body and reduce anxiety about leakage.

The top view which a part of absorptive article by one form of the present invention fractured is shown. FIG. 2 shows a cross-sectional view taken along the line II of FIG. The figure of the state which removed a part of component of the absorbent article by one form of this invention from the surface sheet side, and the lower layer (back surface side absorber layer) of the absorber was partially exposed is shown. Sectional drawing of the strip | belt-shaped high density part in the modification of an absorbent article and its vicinity is shown. The figure of the state which removed a part of component of the absorbent article by another form of this invention from the surface sheet side, and the lower layer (back surface side absorber layer) of the absorber was partially exposed is shown. The figure of the state which removed a part of component of the absorbent article by another form of this invention from the surface sheet side, and the lower layer (back surface side absorber layer) of the absorber was partially exposed is shown. The figure of the state which removed a part of component of the absorbent article by another form of this invention from the surface sheet side, and the lower layer (back surface side absorber layer) of the absorber was partially exposed is shown. II-II sectional view taken on the line of FIG. The top view of the absorptive article by another form of the present invention is shown.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, unless otherwise specified, the same or corresponding components may be denoted by the same reference numerals and description thereof may be omitted.

  In FIG. 1, the partially broken top view of the absorbent article 1 by one form of this invention is shown. FIG. 2 is a cross-sectional view taken along the line I-I of the absorbent article 1 (illustrated with a part of the side omitted). As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-impermeable back sheet 2, a liquid-permeable surface sheet 3, and an absorbent body 4 provided between the sheets 2 and 3. And a main body (absorbent article main body) 8. When the absorbent article 1 is mounted, the top sheet 3 side is the side that touches the skin, and the back sheet 2 side is the side that is fixed to the underwear.

  In this embodiment, the absorber 4 has two layers of a back side absorber layer 5 disposed on the lower side (back sheet 2 side) and a surface side absorber layer 6 disposed on the upper side (top sheet 3 side). It has a structure. As will be described in detail later, the back-side absorber layer 5 includes a belt-like high density portion 5H having a relatively high density, and a portion other than the belt-like high density portion 5H can be used as the low density portion 5L.

  The absorbent body 4 may be wrapped by an encapsulating sheet 9 made of crepe paper or nonwoven fabric for the purpose of maintaining its shape. Here, the entire two-layer absorber in which the back-side absorber layer 5 and the front-side absorber layer 6 are laminated may be wrapped by the encapsulating sheet 9, or the back-side absorber layer 5 and the front-side absorber. At least one of the body layers 6 may be wrapped by the encapsulating sheet 9. Further, instead of wrapping the absorbent body 4 with the encapsulating sheet 9, the encapsulating sheet 9 can be simply disposed between the back-side absorbent layer 5 and the front-side absorbent layer 6. Regardless of whether or not the absorber layer is wrapped by the encapsulating sheet 9 (whether or not the encapsulating sheet 9 is wrapped around the absorber layer), the encapsulating sheet 9 includes the back-side absorber layer 5 and the front-side absorber. By being present between the layers 6, the absorber layers can be prevented from being twisted or cracked.

  Further, as the encapsulating sheet 9, non-colored (that is, white) crepe paper or non-woven fabric can be used, or a colored one can be used. When the colored encapsulating sheet 9 is used, the color of the encapsulating sheet 9 can be reflected as a light color from the surface sheet 3 side. Therefore, it is possible to make the color of the discharged body fluid indistinguishable from the reflected color of the encapsulating sheet 9. The encapsulating sheet 9 can be colored, for example, in a complementary color of the body fluid. For example, in an absorbent article (such as a sanitary napkin) configured for the purpose of absorbing menstrual blood, the encapsulating sheet 9 can be colored green, which is a complementary color of red.

  As shown in FIG. 1, the main body 8 as a whole has an elongated shape having a predetermined length in the first direction D1 and having a predetermined width in a second direction D2 orthogonal to the first direction D1. . The width of the main body 8 is substantially constant in the illustrated example, but may vary over the first direction (longitudinal direction) D1. The absorbent article 1 can have a substantially line-symmetric shape with respect to a center line (longitudinal center line) CL extending in the first direction (longitudinal direction) D1. Further, the configuration of the absorbent article 1 (the portion where the density of the absorber 4 described later is increased, the size and position of the compressed groove formed in the main body, etc.) may be substantially symmetric with the center line as the axis of symmetry. However, it may be asymmetric.

  The length of the first direction D1 in the absorbent article 1 (the total length of the absorbent article 1) can be 100 to 450 mm, preferably 140 to 360 mm, and more preferably 170 to 290 mm. Moreover, the length (width | variety of the absorbent article 1) of the 2nd direction D2 orthogonal to the 1st direction D1 in the absorbent article 1 can be 50-200 mm, Preferably you may be 70-120 mm. it can.

  The absorbent article 1 has a portion (a body fluid discharge port corresponding portion) A corresponding to a body fluid discharge port such as a vaginal opening of the wearer when worn, and the body fluid discharge port corresponding portion A has a center Ac. . The center Ac is on the longitudinal center line CL, and is located at the center of the longitudinal length of the body fluid discharge port corresponding part A. The position of the center Ac can be, for example, a position of 70 to 130 mm from the front end of the absorbent article 1. The body fluid discharge port corresponding part A has a length (length in the longitudinal direction D1) of 10 to 50 mm, preferably about 20 to 40 mm, and the width of the body fluid discharge port corresponding part A (length in the width direction D2). Can be set to an area of about 5 to 40 mm, preferably about 10 to 30 mm. It should be noted that the shape and size of the body fluid discharge port corresponding part A shown in the figure are merely examples for ease of explanation.

  The absorbent article 1 has a crotch corresponding region M corresponding to the wearer's crotch at the time of wearing, a front region F in front of the crotch corresponding region M, and a rear region R behind the crotch corresponding region M. The crotch corresponding region M includes the body fluid discharge port corresponding part A described above. Moreover, the crotch corresponding | compatible area | region M may have the wings W and W for extending reliably from the both sides for fixing the absorbent article 1 to underwear at the time of mounting | wearing. The front region F is a region from the position that is the front starting point of the wing W to the front end edge, and the rear region R can be the region from the position that is the starting point behind the wing W to the rear end edge. Further, when the wings W and W are provided, the position in the longitudinal direction D1 of the center Ac of the body fluid discharge port corresponding part A is the midpoint of the longitudinal length of the lateral edges of the wings W and W. It may be a position.

  In addition, in the form of FIG. 1, the absorbent article 1 has wings W and W, but the absorbent article 1 can have a form without the wings W and W. In that case, when the wings W and W are formed at the positions where the wings W and W are conventionally formed, the front region is defined as the front region F from the position at the front of the wings W and W, and the rear of the wings W and W. The region behind from the position that becomes the starting point can be the rear region R.

  As the back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene can be used. A laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a laminated sheet of a nonwoven fabric that is substantially impervious to liquid by interposing a waterproof film can be used. Further, it is more desirable to use a material having moisture permeability from the viewpoint of preventing stuffiness. As such a water shielding / moisture permeable sheet material, a sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the film in a uniaxial or biaxial direction can be obtained. A porous sheet or the like can be used.

  The top sheet 3 is a liquid-permeable sheet that quickly permeates bodily fluids such as menstrual blood, vaginal discharge, and urine. As the surface sheet 3, a porous or non-porous nonwoven fabric, a porous plastic sheet, or the like is preferably used. Examples of the material fibers constituting the nonwoven fabric include olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cupra, and blended fibers thereof, and natural fibers such as cotton alone or Two or more types can be used in combination. Examples of the nonwoven fabric processing method include a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and a needle punch method. Among these processing methods, the spunlace method is preferable in terms of flexibility and the spunbond method is preferable in that it can produce a nonwoven fabric rich in drapeability, and the thermal bond method is preferable in terms of the ability to manufacture a bulky and soft nonwoven fabric. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber, in which a fiber having a high melting point is a core and a fiber having a low melting point is a sheath, can also be used.

  The absorbent body 4 interposed between the back sheet 2 and the top sheet 3 is not limited as long as it is a material that can absorb and retain body fluid, but preferably contains cotton-like pulp and a water-absorbing polymer. As the water-absorbing polymer, highly water-absorbing polymer granular powder, highly water-absorbing polymer fiber, and a combination thereof can be used. Examples of pulp include cellulose fibers such as chemical pulp obtained from wood and dissolved pulp, and artificial cellulose fibers such as rayon and acetate. As raw materials for chemical pulp, hardwood, softwood, etc. are used, but softwood is preferably used because of its long fiber length.

  Further, the absorbent body 4 may be mixed with synthetic fibers. As synthetic fibers, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It can also be used. In addition, composite fibers such as a core-sheath fiber, a side-by-side fiber, and a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In addition, it is also possible to use a hydrophobic fiber that has been surface treated with a hydrophilizing agent to impart affinity to body fluids.

  The absorbent body 4 is preferably manufactured by a stacking fiber or an airlaid method. The absorbent body 4 as a whole does not have to have a uniform thickness over the front surface, and the body fluid discharge port corresponding part 50 and the area in the vicinity thereof, the central part in the width direction from the crotch corresponding area M to the rear area R bulge out. It can also be made into a structure.

  At the front and rear edge portions of the absorber 4, the outer edges of the back sheet 2 and the top sheet 3 are joined by an adhesive such as hot melt, or an adhesive means such as heat seal or ultrasonic seal. Further, on the side of the absorbent body 4, the side nonwoven fabrics 7 and 7 provided along the longitudinal direction D <b> 1 on both sides of the topsheet 3 side and the backsheet 2 are joined by the above-mentioned bonding means. Thus, the wings W and W described above are formed.

  The side nonwoven fabric 7 is configured using a nonwoven fabric material that has been subjected to appropriate water-repellent treatment or hydrophilic treatment in accordance with the purpose of preventing permeation of body fluids or enhancing the feeling of touch. The side nonwoven fabric 7 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like. For the water repellent treatment of the side nonwoven fabric 7, a water repellent such as silicon or paraffin can be used.

  As shown in FIG. 1, the absorber 4 in this embodiment includes a lower side (back side sheet 2 side) back side absorber layer 5 and an upper side (top sheet 3 side) surface side absorber layer 6. ing. Thus, it becomes possible to give a different function to each layer because the absorber 4 consists of two layers.

  3, from the front side of the absorbent article 1 of FIG. 1, the side nonwoven fabrics 7, 7, the surface sheet 3, the encapsulating sheet 9, and the surface side absorption that is a layer on the upper side (surface sheet 3 side) of the absorber 4. The figure after removing a part of body layer 6 is shown. As shown in FIG. 3, the back-side absorber layer 5 is provided with a pair of band-shaped high-density portions 5H and 5H arranged with a gap in the width direction (second direction) D2. The belt-like high density portion 5H is a portion where the density of the absorber is locally increased in the back surface side absorber layer 5. That is, there is a density difference of the absorber between the belt-like high density portion 5H and a portion adjacent to the belt-like high density portion 5H.

  In the form of illustration, in the back surface side absorber layer 5, parts other than a pair of strip | belt-shaped high density parts 5H and 5H are made into the low density part 5L. The low density portion 5L is a portion having a relatively low density with respect to the belt-like high density portion 5H. If the low density portion 5L as a whole has a lower density than the belt-like high density portion 5H and at least the density of the portion adjacent to the belt-like high density portion 5H is smaller than the belt-like high density portion 5H, Portions with different densities may be formed. For example, as will be described later, a main body pressing groove (a groove formed by pressing the main body) is formed in the entire main body 8 including the low density portion 5L, and a portion having a relatively high density is locally present in the low density portion 5L. It may be formed automatically.

  Since the gap through which the liquid can pass is narrower in the portion where the density of the absorbent body is higher than that in the portion where the density is low, the capillary phenomenon remarkably occurs. For this reason, the body fluid discharged to the main body 8 tends to be drawn from a portion having a low density to a portion having a high density. In this embodiment, the pair of belt-like high density portions 5H and 5H having increased density is formed on the back surface side absorber layer 5, so that the body fluid is easily drawn into the belt-like high density portion 5H. Therefore, the body fluid absorbed in the surface side absorber layer 6 of the absorber 4 is transferred from the surface side absorber layer 6 to the belt-like high density portion 5H if the surface side absorber layer 6 is in contact with the belt-like high density portion 5H. And can be drawn directly. Moreover, even if the front surface side absorber layer 6 is not in direct contact with the belt-like high density portion 5H, the portion where the belt-like high density portion 5H of the back surface side absorber layer 5 is not formed from the front surface side absorber layer 6 (low The bodily fluid that has penetrated into the density portion 5L) can be drawn into the belt-like high-density portion 5H within the back-side absorber layer 5.

  And since the strip | belt-shaped high density part 5H is formed in strip | belt shape along the longitudinal direction D1, the bodily fluid drawn into the strip | belt-shaped high density part 5H becomes easy to be guide | induced to the front and back along the longitudinal direction D1. Therefore, side leakage can be prevented, and the front and rear regions of the elongated absorbent body can be used effectively.

  Further, the belt-like high density portions 5H and 5H are respectively formed between the longitudinal center line CL and the end portion in the width direction D2. That is, the belt-shaped high-density part 5H does not extend to the end part in the width direction D2. Therefore, as described above, diffusion of body fluid along the longitudinal direction D1 is promoted, while diffusion of body fluid toward the outside in the width direction D2 is suppressed. Therefore, so-called side leakage can be effectively prevented.

  In this embodiment, since there is the belt-like high density portion 5H, the body fluid can be guided / dispersed forward and backward mainly by the back-side absorbent layer 5 (lower layer). If the state in which the body fluid spreads in the surface direction becomes noticeable from the surface, the user may have anxiety that it may leak, but according to this embodiment, such anxiety is also reduced. be able to.

  As shown in FIG. 3, the pair of belt-like high density portions 5H and 5H are formed at a predetermined distance d1 at least in the crotch corresponding region M. Therefore, it can be set as the structure without a high-density part in the place within the distance d1, ie, the place near the center Ac of the bodily fluid discharge port corresponding part A or the bodily fluid discharge port corresponding part A. Thereby, the softness | flexibility of the part close | similar to the center Ac of the bodily fluid discharge | emission corresponding | compatible part A or the bodily fluid discharge | release corresponding part A in the crotch corresponding | compatible area | region M can be maintained. Among the body parts that the absorbent article contacts, the bodily fluid outlet and its periphery are particularly sensitive parts. Therefore, the wearing feeling is improved by not forming a high-density part in the part of the absorbent body corresponding to the part. be able to. Moreover, since it is not high-density in the part close | similar to the longitudinal direction center line CL, the longitudinal direction center line CL vicinity at the time of mounting | wearing becomes easy to swell to the skin side, and can also improve fitting property.

  A width between the pair of belt-like high density portions 5H and 5H, that is, a distance d1 in the width direction (second direction D2) between the pair of belt-like high density portions 5H and 5H in the crotch corresponding region M is 10 to 30 mm. It may be, preferably 12 to 25 mm. When the distance d1 is 10 mm or more, the flexibility of the body fluid discharge port corresponding part A or the portion near the center Ac of the body fluid discharge port corresponding part A can be reliably ensured. When the distance d1 is 30 mm or less, the belt-like high-density portion 5H that induces body fluid does not move too far outward in the width direction, and it is possible to prevent the body fluid from reaching the belt-like high-density portion 5H.

  The distance between the pair of belt-like high density portions 5H and 5H can be d1 or more in the entire longitudinal direction, that is, in a region other than the crotch corresponding region M (front region F and / or rear region R). Thereby, in the front area | region F and / or the back area | region R, it can prevent that an absorber becomes hard near longitudinal direction center line CL and impairs a mounting feeling.

  As shown in FIG. 3, the belt-like high density portion 5H has a belt-like planar view shape having a predetermined width. The width (the length in the second direction D2) of each belt-shaped high density portion 5H may be 5 to 25 mm, and preferably 8 to 15 mm. By setting the width of the belt-like high-density part 5H to 5 mm or more, the force for drawing body fluid into the belt-like high-density part 5H can be improved, and the body fluid can be appropriately guided in the longitudinal direction in the back side absorbent layer 5. In addition, by setting the width of the belt-shaped high-density part 5H to 25 mm or less, it is possible to prevent the area of the high-density part from becoming excessively large and excessively increase the rigidity of the absorber, and to ensure a good wearing feeling. .

  The width of the belt-shaped high density portion 5H is constant from the front to the rear in the illustrated form, but may vary. For example, the width of the belt-shaped high-density part 5H can be increased as it is closer to the end in the longitudinal direction of the absorbent article (as it is closer to the front or rear). Thereby, the function which guide | induces the absorbed bodily fluid to the front and back of a longitudinal direction can be improved. In addition, at least one of the inner edge in the width direction and the outer edge in the width direction of the belt-shaped high-density portion 5H may have a non-linear portion, for example, a zigzag portion or a wavy portion.

  In the form shown in the figure, the belt-like high density portion 5H extends over the longitudinal direction D1 of the back surface side absorber layer 5. That is, the front end portions 5Ha and 5Ha and the rear end portions 5Hb and 5Hb of the pair of band-shaped high-density portions 5H and 5H reach the front end and the rear end of the back surface side absorber layer 5 (the absorber 4 and the main body 8). Thereby, the function which guides a bodily fluid to the front and back by strip | belt-shaped high density part 5H can be improved. However, the front end portion 5Ha and the rear end portion 5Hb of the belt-shaped high-density portion 5H are terminated at positions on the inner side in the longitudinal direction from the front end and the rear end of the back surface side absorber layer 5, and the length of the absorber 4 in the longitudinal direction D1 is long. It may be shorter than that. For example, the length in the longitudinal direction D1 of the belt-shaped high-density part 5H can be set to 3/4 or more, preferably 5/6 or more, of the length of the absorbent body 4 in the longitudinal direction D1.

As described above, the belt-like high density portion 5H is a portion having a relatively higher density than the surroundings, that is, a portion having a relatively higher density than the adjacent low density portion 5L. The density of the belt-like high density portion 5H is not particularly limited as long as the belt-like high density portion 5H has a function of drawing body fluid from the low density portion 5L, but the density of the belt-like high density portion 5H is 40 to 120 kg / m ³ . Preferably, it is 60-100 kg / m ³ .

Moreover, it is preferable that the density of the low density part 5L is 25-60 kg / m < ³ >.

  The density of the belt-like high-density part 5H and the low-density part 5L may be an average density when the density is different in the belt-like high-density part 5H or the low-density part 5L.

  In addition, the value of the density and thickness of an absorber (back surface side absorber layer and front surface side absorber layer) in this specification is a value in a state in which a body pressing groove (fit emboss) described later is not provided. be able to.

  Moreover, in this specification, the density of an absorber can be measured as follows. A portion to be measured from the absorber (portion where no fit embossing is provided) is cut out to an arbitrary size, and the area is measured. Further, the weight of the cut portion is measured, and the thickness is measured. The density is calculated from the area, thickness, and weight thus measured.

  The thickness can be measured, for example, by a thickness measuring instrument (“Peacock” manufactured by Ozaki Mfg. Co., Ltd., model number: FFD-7). Moreover, when calculating | requiring the density of a surface side absorber layer or a back surface side absorber layer, peel off the layer which wants to measure, cut out to arbitrary magnitude | sizes, measure each value as mentioned above, and calculate a density . When comparing the density of the front surface side absorber layer and the back surface side absorber layer in a predetermined portion of the absorber, each layer is peeled off from the cut portion of the absorber and measurement is performed.

  The belt-shaped high-density part 5H can be formed by pressing. In that case, for example, the belt-like high density portion 5H can be formed by preparing an absorber layer having a uniform thickness and density and pressing a predetermined portion where the belt-like high density portion 5H is to be formed. The squeezing can be performed by passing the prepared absorber layer between a pair of pressure rolls. The pair of pressure rolls can be, for example, a combination of one roll having a concave portion corresponding to the shape of the belt-shaped high-density portion 5H on the surface and the other flat roll having no concave portion. By utilizing such pressing, the belt-like high density portion 5H can be easily formed.

  In FIG. 4, the form which has the strip | belt-shaped high density part 5H formed by pressing is shown. FIG. 4 is a cross-sectional view partially showing the absorber 4 taken along the line II in FIG. As shown in FIG. 4, the back surface side absorber layer 5 has depressions formed from the front surface side to the back surface side, and a belt-like high density portion 5H is formed at that position. That is, in the illustrated form, the belt-like high-density part 5H has a higher density than the low-density part 5L, but has a smaller thickness. Thus, the belt-shaped high density part 5H can be formed by forming a pressing groove. Since the belt-like high-density part 5H is formed by pressing (compression), the absorber is easily deformed with the belt-like high-density part 5H as a base point at the time of wearing, so that the region near the longitudinal center line CL is on the skin side. It is easy to swell and the effect of improving fit is also obtained.

  In addition, when the strip | belt-shaped high density part 5H is squeezed, the thickness of the strip | belt-shaped high density part 5H may be 20-70% with respect to the thickness 100% of the state before pressing, and is about 30-55%. And preferred.

  In FIG. 4, an example of the flow of body fluid is indicated by arrows. In the absorber 4 as shown in FIG. 4, the body fluid discharged to the front side diffuses to the back side absorber layer 5 through the front side absorber layer 6 due to capillary action, gravity and the like. And the bodily fluid which reached the back surface side absorber layer 5 moves from the low density portion 5L to the belt-like high density portion 5H, and further along the longitudinal direction of the belt-like high density portion 5H (a method orthogonal to the paper surface) It can diffuse in the front and back of the side absorber layer 5.

  In the form of FIG. 4, the belt-shaped high-density part 5H of the back surface side absorber layer 5 is formed so that a pressing groove is formed on the surface side by pressing the absorber layer from the surface side. However, you may form a pressing groove by pressing an absorber layer from the back surface side. In that case, it can be set as the structure which the strip | belt-shaped high density part 5H and the surface side absorber layer 6 contact | abut, and the transfer of the bodily fluid from the surface side absorber layer 6 to the strip | belt-shaped high density part 5H can be promoted more. . Moreover, the strip | belt-shaped high density part 5H can also be formed by squeezing from both the surface and the back side.

  In the production of the back side absorber layer 5, an absorber layer having a uniform thickness and density is prepared, and another absorber layer piece having the same shape as the portion where the band-like high-density portion 5H is to be formed It can also laminate | stack on the part which wants to form the part 5H, and can squeeze the part which laminated | stacked the another absorber layer piece at least. In this case, the thickness of the back surface side absorber layer 5 is made uniform by adjusting the squeezing conditions, that is, the thicknesses of the belt-like high density portion 5H and the other portions (low density portion 5L) are made equal. You can also.

  Also, when stacking fibers, the absorbent layer is formed so that the basis weight of the portion where the belt-like high density portion 5H is to be formed is larger (thickness is larger), and at least the portion having a larger basis weight is squeezed The back-side absorber layer 5 having the belt-like high density portion 5H can be formed.

  Furthermore, the belt-like high density portion 5H and the low density portion 5L can be separately formed and combined. For example, an absorber layer is formed only in a region excluding a portion where the pair of belt-like high density portions 5H and 5H are to be formed, and then the high density formed in the shape of the pair of belt-like high density portions 5H and 5H. An absorber layer piece can be fitted. In addition, an absorber layer having a uniform thickness, and a part of the surface side in a range where the pair of band-like high density portions 5H and 5H are desired to be formed, is separately formed at a high density. Layer pieces can also be fitted. In that case, the materials (diameter, length, particle diameter, shape, etc. of the fibers contained in the absorber) used for the absorbers of the belt-like high density portion 5H and the low density portion 5L may be different. Also in this case, the thicknesses of the pair of belt-like high density portions 5H and 5H and the low density portion 5L can be the same or different.

  The configuration of the surface-side absorber layer 6 is not particularly limited, but the density of the surface-side absorber layer 6 can be uniform as a whole, and a relatively small portion of the surface-side absorber layer 6 can be formed as described later. It can also be used to induce body fluid by changing the density. However, it is preferable that the front-side absorber layer 6 is not formed with a band-shaped high-density portion that is formed in the back-side absorber layer 5. Thereby, it can prevent that the spreading | diffusion in the surface direction in the surface side absorber layer 6 is conspicuous through the surface sheet 3. FIG.

The density of the front surface side absorber layer 6 can be made equal to the density of the low density portion 5L of the back surface side absorber layer 5, and can be made smaller than the density of the low density portion 5L. When the density of the front surface side absorber layer 6 is smaller than the density of the low density part 5L of the back surface side absorber layer 5, it is possible to promote the drawing of body fluid from the front surface side absorber layer 6 to the back surface side absorber layer 5. it can. The density of the surface side absorber layer 6 is preferable to be 20~80kg / ^{m 3,} more preferably a 25~50kg / ^{m 3.}

  The thickness of the whole absorber 4 can be in the range of 0.3 to 30 mm, and is preferably in the range of 1.0 to 15 mm.

  The thickness of the back surface side absorber layer 5 (thickness of the low density part 5L) is preferably 1.0 to 5.5 mm, and more preferably 1.5 to 3.0 mm. When the belt-like high density portion 5H is formed by pressing, the thickness of the belt-like high density portion 5H is preferably 0.5 to 3.5 mm, and more preferably 1.0 to 2.0 mm. Moreover, the thickness of the surface side absorber layer 6 is preferably 1.0 to 5.5 mm, and more preferably 1.5 to 3.0 mm. The thickness of the back surface side absorber layer 5 and the thickness of the surface side absorber layer 6 may be the same or different. When the thickness of the surface side absorber layer 6 is larger, it is preferable from the viewpoint of making the diffusion of body fluid inconspicuous when viewed from the surface side. On the other hand, when the thickness of the back surface side absorber layer 5 is large, it is preferable from the viewpoint that the diffusion in the longitudinal direction can be further promoted.

  In addition, as long as the area of the surface side absorber layer 6 has overlapped with a pair of strip | belt-shaped high density parts 5H and 5H, it may be the same as that of the back surface side absorber layer 5, and may differ. Moreover, it is preferable that the surface side absorber layer 6 has covered the whole of a pair of strip | belt-shaped high density part 5H, 5H.

  FIG. 5 shows a configuration including a pair of belt-like high density portions 25H and 25H as a modification of the belt-like high density portion. FIG. 5 shows, similarly to FIG. 3, from the front side of the absorbent article 20, the side nonwoven fabric, the surface sheet, the encapsulated sheet, and the surface-side absorbent layer 26 that is the upper layer (surface sheet side) of the absorbent body. The figure after removing a part is shown. The form of FIG. 5 is different from the form of FIG. 3 in that the front end portions 25Ha and 25Ha and the rear end portions 25Hb and 25Hb of the pair of band-shaped high density portions 25H and 25H are curved outward in the width direction. With this configuration, the body fluid drawn into the belt-like high density portion 25H can be diffused diagonally forward and diagonally rearward of the back-side absorber layer 5, and the absorber can be used efficiently.

  In FIG. 6, the absorbent article 30 by another form is shown partially. FIG. 6 is a view after removing a part of the side nonwoven fabric, the surface sheet, the encapsulating sheet, and the surface-side absorbent layer 36 from the surface side of the absorbent article 30. FIG. 6 shows a back-side absorber layer 35 placed on the back-side sheet 32 and a front-side absorber layer 36 disposed on the back-side absorber layer 35.

  The basic configuration of the configuration of FIG. 6 is the same as the configuration of FIG. 3, but the pair of belt-like high density portions 35H, 35H is paired with a pair of front belt-like high density portions 35Hf, 35Hf and a pair of rear belt-like portions. It is different in that it is divided into high density portions 35Hr and 35Hr. As shown in FIG. 6, the pair of front belt-like high density portions 35Hf, 35Hf are arranged in front of the center Ac of the body fluid discharge port corresponding portion A, and the pair of rear belt-like high density portions 35Hr, 35Hr are It is preferable that it is arranged behind the center Ac of the body fluid discharge port corresponding part A. Thus, a part without a high density part can be formed even if it sees in a longitudinal direction in the body fluid discharge port corresponding | compatible part A and its vicinity by dividing a pair of strip | belt-shaped high density part into front and back. Therefore, the softness of the absorber can be ensured in the body fluid discharge port corresponding part A and the vicinity thereof. Thereby, a feeling of wearing can be improved effectively by improving the flexibility and cushioning properties of the absorbent body in the body fluid discharge port corresponding part and its peripheral part that are in contact with the part at the time of wearing.

  As shown in FIG. 6, the pair of front belt-like high density portions 35Hf and 35Hf includes front end portions 35Hfa and 35Hfa and rear end portions 35Hfb and 35Hfb. Further, the pair of rear belt-like high density portions 35Hr and 35Hr have front end portions 35Hra and 35Hra and rear end portions 35Hrb and 35Hrb. The pair of front belt-like high density portions 35Hf, 35Hf, the rear end portions 35Hfb, 35Hfb, and the pair of rear belt-like high density portions 35Hr, 35Hr, the front end portions 35Hra, 35Hra each include a body fluid discharge port corresponding portion A. It is located in the crotch corresponding region M. Thereby, even if the position or range where the body fluid is discharged is slightly shifted in the crotch corresponding region M, the pair of front belt-like high density portions 35Hf, 35Hf and the pair of rear belt high-density portions 35Hr, 35Hr are at least On the other hand, since the discharged body fluid can surely reach, the body fluid can be favorably guided to at least one of the front and rear.

  The longitudinal distance d2 between the rear end portion 35Hfb of the front belt-like high-density portion 35Hf and the front end portion 35Hra of the rear belt-like high-density portion 35Hr is preferably 10 to 40 mm, and more preferably 20 to 30 mm. . When the distance d2 is 10 mm or more, the flexibility and cushioning properties of the absorber can be improved. On the other hand, when the distance d2 is 40 mm or less, the discharged body fluid can be reliably delivered by the front end portion 35Hra of the front band-shaped high density portion 35Hf and the rear end portion 35Hfb of the rear band-shaped high density portion 35Hr, Body fluid can be guided in the longitudinal direction.

  As shown in FIG. 6, the pair of front belt-like high density portions 35Hf, 35Hf, the rear end portions 35Hfb, 35Hfb, and the pair of rear belt-like high density portions 35Hr, 35Hr, the front end portions 35Hra, 35Hra It may be curved. By such a curve, the belt-like high density portion can be brought closer to the center Ac of the body fluid discharge port A in the width direction as it approaches the center Ac of the body fluid discharge port corresponding portion A when viewed in the longitudinal direction. With this configuration, even if the discharge amount is small, the body fluid is immediately removed from the front high density portions 35Hf, 35Hf at the front ends 35Hfb, 35Hfb and the front end portions of the rear high density portions 35Hr, 35Hr. 35Hra, 35Hra can be reached and guided along the belt-like high density portion. In the illustrated embodiment, both the rear end portion 35Hfb of the front belt-like high density portion 35Hf and the front end portion 35Hra of the rear belt-like high density portion 35Hr are curved inward in the width direction, but at least one of them is curved. It can also be in the form.

  In FIG. 7, the structure of the absorbent article 40 by another form is shown partially. FIG. 7 is a view after removing a part of the side nonwoven fabric, the surface sheet, the encapsulating sheet, and the surface side absorbent layer 46 from the surface side of the absorbent article 40. In FIG. 7, a back-side absorber layer 45 placed on the back-side sheet 42 and a front-side absorber layer 46 disposed on the back-side absorber layer 45 are shown. FIG. 8 is a cross-sectional view taken along line II-II in FIG.

  The back side absorber layer 45 shown in FIG. 7 has the same configuration as the back side absorber layer 5 shown in FIG. That is, as shown in FIG. 7, the back-side absorber layer 45 is provided with a pair of belt-like high density portions 45H, 45H, and the pair of belt-like high density portions 45H, 45H includes at least the crotch corresponding region M. In FIG. 5, the absorbers 44 are arranged at a distance d1 from each other and extend in the longitudinal direction D1 from the front end to the rear end of the absorber 44. However, this embodiment is different from the embodiment shown in FIG. 3 in that a pair of body fluid guiding portions 46C and 46C are formed on the surface-side absorber layer 46.

  As shown in FIGS. 7 and 8, the pair of body fluid guiding portions 46 </ b> C and 46 </ b> C is provided in the crotch corresponding region M including the body fluid discharge port corresponding portion A. Thereby, the body fluid discharged to a certain extent in the crotch corresponding region M can be drawn into the pair of body fluid guiding portions 46C and 46C in the surface side absorption layer 46.

  Furthermore, it is preferable that the pair of body fluid guiding portions 46C and 46C overlap with the pair of band-shaped high-density portions 45H and 45H, respectively, in a top view. Thus, the body fluid drawn into the pair of high density portions 46H and 46H can easily be guided to the pair of belt-like high density portions 45H and 45H positioned below the body fluid. Further, the pair of body fluid guiding portions 46C and 46C are respectively formed within the range of the pair of belt-like high density portions 45H and 45H, that is, do not cross the inner edges of the pair of belt-like high density portions 45H and 45H. More preferably, it is formed.

The pair of body fluid guiding portions 46C and 46C can be portions (density portions) having a higher density than portions other than the body fluid guiding portion 46C. In that case, the body fluid induction portion 46C, the density of 46C is preferable to be 40~110kg / ^{m 3,} more preferably a 50~90kg / ^{m 3.} Further, the density of the body fluid guiding portion 46C of the front surface side absorber layer 46 is preferably smaller than the density of the belt-like high density portion 45H of the back surface side absorber layer 45. This facilitates the transfer of the body fluid from the body fluid guiding portion 46C to the belt-like high density portion 45H of the lower back side absorber layer 45.

The size of the body fluid guiding portion 46 </ b> C is preferably smaller than the belt-like high density portion 5 </ b> H of the back surface side absorber layer 5. For example, the length of the body fluid guide 46C in the longitudinal direction D1 may be about 10 to 30 mm, and the length in the width direction D2 may be about 2.5 to 12.5 mm. The area of the body fluid guiding portion 46C can be about 25 to 375 mm ² .

  When the body fluid guiding portion 46C is a high density portion, the body fluid guiding portion 46C can be formed by the same method as the belt-shaped high density portion of the back side absorber layer 46. That is, the high density portion 46H can be a compressed groove. In the illustrated embodiment, the pair of body fluid guiding portions 46C and 46C is rectangular, but may be another shape. For example, the shape may be a circle, an ellipse, or a square, a polygon such as a pentagon or a hexagon, a star, a heart, or a drop.

  The body fluid guiding portion 46C is not limited as long as it can quickly guide the body fluid to the back side absorber layer 45, and may be, for example, a through hole.

  In FIG. 9, the top view of the absorbent article 50 by another form is shown. The absorbent article 50 shown in FIG. 9 has the same basic configuration as the absorbent article 1 shown in FIG. 1, and the absorber 54 includes a back-side absorbent layer 55 and a front-side absorbent layer 56. A pair of band-shaped high density portions 55H and 55H with increased density are formed on the back side absorber layer 55. However, in the form shown in FIG. 9, the absorbent article 1 shown in FIG. 1 is formed in the main body 58 in that a main body pressing groove (also referred to as fit embossing) FE that is recessed from the top sheet side to the back sheet side is formed. And different.

  The main body pressing groove FE is a narrow groove-shaped pressing portion whose width in the direction orthogonal to the extending direction of the groove is about 1.0 to 2.0 mm. The main body pressing groove FE may have a function of collecting body fluid in the main body pressing groove FE and guiding the body fluid along the main body pressing groove FE. Moreover, since the main body 58 can be deformed so that the body fluid discharge port corresponding part A and its vicinity swell to the skin side with the main body pressing groove FE as a base point at the time of wearing, the absorbent article 50 can be brought into close contact with the skin. And leakage can be prevented.

  In the form of FIG. 9, the main body pressing groove FE is formed symmetrically with the longitudinal center line CL as a symmetry line. The main body pressing groove FE includes at least a pair of crotch corresponding region pressing grooves FE1 and FE1 extending in the longitudinal direction beyond the crotch corresponding region M forward and rearward. In the illustrated form, the pair of crotch-corresponding region pressing grooves FE1 and FE1 extend so as to protrude outward in the width direction (so as to bulge outward in the width direction) in plan view. It may extend so as to be convex inward (so as to be recessed inward in the width direction) or may be linear.

  As shown in FIG. 9, the pair of crotch corresponding region pressing grooves FE1 and FE1 may overlap with the pair of band-shaped high-density portions 55H and 55H of the back-side absorbent layer 55 in a plan view, respectively. Moreover, it is preferable that the crotch corresponding | compatible area | region pressing groove FE1 and FE1 do not exceed a pair of strip | belt-shaped high density part 55H and 55H on the width direction outer side by planar view. That is, it is preferable that the pair of belt-like high density portions 55H and 55H is disposed on the inner side in the width direction than the widthwise outer edge of the pair of belt-like high density portions 55H and 55H of the back surface side absorber layer 55. Thereby, it can prevent that the bodily fluid absorbed by the absorber 54 is spread | diffused to the width direction outer side of a strip | belt-shaped high-density part, and it becomes easy to leak, moving along the crotch corresponding area | region compressed groove FE1, FE1. .

1, 20, 30, 40, 50 Absorbent article 2, 22, 32, 42 Back sheet 3, 23, 33, 43, 53 Top sheet 4, 24, 34, 44, 54 Absorber 5, 25, 35, 45 55 Back surface side absorber layer 6, 26, 36, 46, 56 Front surface side absorber layer 5H, 25H, 35H, 45H, 55H Belt-like high density portion 35Hf Front belt-like high density portion 35Hfa Front edge of belt-like high-density portion Part 35Hfb Front end of belt-shaped high-density part 35Hr Rear band-shaped high-density part 35Hra Rear end of band-shaped high-density part 35Hrb Rear end of band-shaped high-density part 5L, 25L, 35L, 45L, 55L Low Density part 8, 58 body (absorbent article body)
9 Encapsulating sheet 46C High-density part CL (of the surface side absorber layer) Longitudinal center line D1 First direction D2 Second direction FE Main body pressing groove FE1 Crotch corresponding region pressing groove

Claims (8)

An absorbent article comprising a substantially elongated main body having a liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body provided between the top sheet and the back sheet. ,
The absorber has a back side absorber layer arranged on the back sheet side and a surface side absorber layer arranged on the top sheet side,
The back side absorber layer has a pair of band-shaped high-density portions extending in a substantially longitudinal direction,
The width between the pair of belt-shaped high-density parts is an absorbent article that is 10 to 30 mm in a crotch corresponding region corresponding to the crotch of the wearer when worn.   The absorbent article according to claim 1, wherein the rear end portion and the front end portion of the pair of belt-shaped high-density portions are curved outward in the width direction. The pair of belt-like high density portions includes a pair of front belt-like high density portions and a pair of rear belt-like high density portions,
The rear end portions of the pair of front belt-shaped high-density portions and the front end portions of the pair of rear belt-shaped high-density portions are in the crotch corresponding region,
The absorbent article according to claim 1, wherein a distance in a longitudinal direction between a rear end portion of the pair of front belt-like high-density portions and a front end portion of the pair of rear belt-like high-density portions is 10 to 40 mm. .   4. The absorbent article according to claim 3, wherein a rear end portion of the pair of front belt-shaped high-density portions and a front end portion of the pair of rear belt-shaped high-density portions are curved inward in the width direction.   The width | variety of the said strip | belt-shaped high density part is an absorbent article as described in any one of Claim 1 to 4 which is 5-25 mm.   The absorbent article according to any one of claims 1 to 5, wherein the pair of band-shaped high-density portions are formed by pressing. The surface-side absorber layer has a body fluid guiding portion,
The absorbent article according to any one of claims 1 to 6, wherein the body fluid guiding portion overlaps the pair of belt-like high-density portions in plan view in the crotch region. The main body is provided with a pair of main body pressing grooves extending substantially in the longitudinal direction, which are recessed from the top sheet side to the back sheet side,
The absorptivity according to any one of claims 1 to 7, wherein the pair of main body compressed grooves are disposed on the inner side in the width direction than the outer edge in the width direction of the pair of belt-shaped high-density portions in the crotch corresponding region. Goods.

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