JP7109942B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

Conventionally, absorbent articles such as panty liners, sanitary napkins, incontinence pads, etc., have been known in which an absorbent is interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet.

Such absorbent articles are known to have a configuration in which the density of the absorbent body is changed depending on the location for the purpose of controlling the transfer of absorbed body fluid. For example, in Patent Document 1, an absorbent core (absorbent body) includes a pair of side regions, a pair of high-density regions located on the center side in the width direction from the side regions and having a higher density than the side regions, An arrangement 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 regions.

JP 2017-86622 A

In the configuration of Patent Document 1, the liquid taken in between the high density regions can be diffused to the high density regions. However, since the high-density region is formed directly under the topsheet, the diffusion of bodily fluids is easily visible from the surface. Therefore, the user may feel uneasy about leakage.

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

A first form of the present invention is a substantially elongated main body having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body provided between the topsheet and the backsheet. wherein the absorbent body has a back side absorbent layer arranged on the back sheet side and a front side absorbent layer arranged on the top sheet side, and the back side The absorbent layer has a pair of strip-shaped high-density portions extending substantially in the longitudinal direction, and the width between the pair of strip-shaped high-density portions is 10 to 30 mm in the region corresponding to the wearer's crotch when worn. be.

According to the first mode, the absorbent body has a back side absorbent layer and a front side absorbent layer, and the back side absorbent layer on the back sheet side has a space of 10 to 30 mm in the region corresponding to the crotch. A pair of spaced-apart strip-shaped high-density portions are provided. Therefore, the bodily fluid discharged to the part corresponding to the bodily fluid outlet reaches the absorbent body through the topsheet, and is drawn into the band-shaped high density part of the back side absorbent layer from the relatively low density part by capillary action. Since the strip-shaped high-density part has a strip-like shape extending substantially in the longitudinal direction in a plan view, the bodily fluid drawn in is guided forward and rearward along the strip-shaped high-density part and diffused. can be made

In addition, since the strip-like high-density portion is provided on the back side absorbent layer, diffusion of the body fluid along the strip-like high-density portion is difficult to see from the front side. Therefore, it is possible to reduce the user's anxiety about leakage when looking at the surface of the absorbent article.

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

According to the second aspect, the bodily fluid drawn into the belt-like high-density portion can be diffused obliquely forward and obliquely rearward of the absorbent body, and the absorbent body can be used efficiently.

In a third aspect of the invention, the pair of high density strips includes a pair of front high density strips and a pair of rear high density strips, wherein the pair of front high density strips The rear ends and the front ends of the pair of rear high density strips are within the groin corresponding region, and the rear ends of the pair of front high density strips and the pair of rear high density strips are within the crotch corresponding region. The longitudinal distance from the front end of the part is 10-40 mm.

According to the third aspect, since the pair of strip-shaped high-density portions are divided into the front and the rear, the portion provided with the high-density portion can be reduced in the region corresponding to the bodily fluid discharge port and its vicinity. can be done. Therefore, the softness of the absorbent body can be maintained in the portion corresponding to the bodily fluid discharge port and the region in the vicinity thereof, and the feeling of wearing can be improved.

In the fourth aspect of the present invention, the rear ends of the pair of front strip-shaped high density portions and the front ends of the pair of rear strip-shaped high density portions are curved inward in the width direction.

According to the fourth aspect, the rear end of the front strip-shaped high-density portion and the front end of the rear strip-shaped high-density portion are oriented so as to face the body fluid outlet corresponding portion. being approached. Therefore, the bodily fluid discharged to the body fluid outlet corresponding portion and the vicinity thereof can be rapidly drawn in from the rear end portion of the front high-density strip portion and the front end portion of the rear high-density strip portion.

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

According to the fifth aspect, the pair of strip-shaped high-density portions have a predetermined width, so that body fluid can be properly guided in the longitudinal direction in the absorbent body. Moreover, it is possible to prevent the rigidity of the absorbent body from increasing due to an excessive increase in the area of the high-density portion, and to ensure a good wearing feeling.

In a sixth aspect of the present invention, the pair of strip-shaped high-density portions are formed by pressing.

According to the sixth aspect, since the high-density portion can be formed while the basis weight of the absorbent body is kept uniform, manufacturing can be performed in a small number of steps.

In a seventh aspect of the present invention, the front-side absorbent layer has a bodily fluid guiding portion, and the bodily fluid guiding portion overlaps the pair of strip-shaped high-density portions in the region corresponding to the crotch area in a plan view. .

According to the seventh aspect, the bodily fluid guiding portion of the front side absorbent layer on the side of the front sheet of the absorbent body can guide bodily fluids in the upper layer of the absorbent body. In addition, since the body fluid guide portion of the front side absorbent layer overlaps the band-like high density portion of the back side absorbent layer in a plan view, the body fluid drawn into the body fluid guide portion of the front side absorbent layer can be quickly dissipated. It is possible to draw it into the belt-like high-density portion of the back side absorbent layer and guide it in the longitudinal direction.

In an eighth form of the present invention, the main body is provided with a pair of main body compression grooves extending in the longitudinal direction recessed from the topsheet side to the backsheet side, and the pair of main body compression grooves are In the region corresponding to the crotch region, it is arranged on the inner side in the width direction from the width direction outer edges of the pair of belt-shaped high density portions.

According to the eighth aspect, the position of the main body compressed groove (fit emboss) is inside the width direction outer edge of the pair of belt-shaped high density portions, so that the absorbent body moves along the main body compressed groove while moving to the absorbent body. It is possible to prevent the body fluid to be absorbed from diffusing to the outside in the width direction of the band-like high-density portion and becoming more likely to leak.

ADVANTAGE OF THE INVENTION According to one form of this invention, the absorbent article which can diffuse a bodily fluid rapidly in an absorber, and can reduce a feeling of uneasiness about leakage can be provided.

1 shows a plan view of a partially broken absorbent article according to one embodiment of the present invention; FIG. FIG. 2 shows a sectional view taken along the line II of FIG. 1; 1 shows a state in which a part of constituent elements of an absorbent article according to one embodiment of the present invention is removed from the topsheet side, and a lower layer (back side absorbent layer) of an absorbent body is partially exposed; FIG. The sectional view of the strip|belt-shaped high density part in the modification of an absorbent article, and its vicinity is shown. FIG. 4 shows a state in which part of the constituent elements of an absorbent article according to another embodiment of the present invention is removed from the topsheet side, and the lower layer of the absorbent body (back side absorbent body layer) is partially exposed. FIG. 4 shows a state in which part of the constituent elements of an absorbent article according to another embodiment of the present invention is removed from the topsheet side, and the lower layer of the absorbent body (back side absorbent body layer) is partially exposed. FIG. 4 shows a state in which part of the constituent elements of an absorbent article according to another embodiment of the present invention is removed from the topsheet side, and the lower layer of the absorbent body (back side absorbent body layer) is partially exposed. 8 shows a cross-sectional view taken along line II-II of FIG. 7; FIG. Fig. 3 shows a top view of an absorbent article according to another aspect of the invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing, unless there is a particular description, the same reference numerals may be attached to the same or corresponding configurations, and the description thereof may be omitted.

FIG. 1 shows a partially broken plan view of an absorbent article 1 according to one embodiment of the present invention. Further, FIG. 2 shows a cross-sectional view of the absorbent article 1 taken along line II (with a part of the side omitted). As shown in FIGS. 1 and 2, an absorbent article 1 comprises a liquid-impermeable backsheet 2, a liquid-permeable topsheet 3, and an absorbent body 4 provided between these sheets 2 and 3. and a main body (absorbent article main body) 8. When wearing the absorbent article 1, the side of the top sheet 3 is the side that touches the skin, and the side of the back sheet 2 is the side that is fixed to the underwear.

In this embodiment, the absorber 4 is composed of two layers, a back side absorber layer 5 arranged on the lower side (on the side of the back sheet 2) and a front side absorbent layer 6 arranged on the upper side (on the side of the top sheet 3). It is structured. As will be described in detail later, the back-side absorbent layer 5 has strip-shaped high-density portions 5H having a relatively high density, and portions other than the strip-shaped high-density portions 5H can serve as low-density portions 5L.

The absorbent body 4 may be wrapped with an enveloping sheet 9 made of crepe paper or non-woven fabric for the purpose of retaining its shape. Here, the entire two-layer absorbent body in which the back-side absorbent layer 5 and the front-side absorbent layer 6 are laminated may be wrapped by the wrapping sheet 9, or the back-side absorbent layer 5 and the front-side absorbent layer 6 may be wrapped. At least one of the body layers 6 may be wrapped with an enveloping sheet 9 . Alternatively, instead of wrapping the absorbent body 4 with the wrapping sheet 9 , the wrapping sheet 9 can simply be arranged between the back side absorbent layer 5 and the front side absorbent layer 6 . Regardless of whether or not the absorbent layer is wrapped by the wrapping sheet 9 (whether the wrapping sheet 9 is wrapped around the absorbent layer), the wrapping sheet 9 is the back side absorbent layer 5 and the front side absorbent body. By being present between the layers 6, each absorbent layer can be prevented from twisting and cracking.

Further, as the enveloping sheet 9, non-colored (that is, white) crepe paper or non-woven fabric can be used, or a colored one can be used. When a colored enveloping sheet 9 is used, the color of the enveloping sheet 9 can also be reflected as a light color from the topsheet 3 side. Therefore, the color of the discharged bodily fluid can be blended with the reflected color of the wrapping sheet 9 to make it inconspicuous. The enveloping sheet 9 can be colored, for example, in a complementary color to the body fluid color. For example, in an absorbent article (such as a sanitary napkin) designed to absorb menstrual blood, the enveloping sheet 9 can be colored green, which is a complementary color of red.

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

The length of the absorbent article 1 in the first direction D1 (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. In addition, the length of the absorbent article 1 in the second direction D2 orthogonal to the first direction D1 (the width of the absorbent article 1) can be 50 to 200 mm, preferably 70 to 120 mm. can.

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

The absorbent article 1 has a crotch region M corresponding to the wearer's crotch when worn, a front region F in front of the crotch region M, and a rear region R behind the crotch region M. The region M corresponding to the crotch area includes the portion A corresponding to the bodily fluid outlet described above. In addition, the crotch corresponding region M may have wings W, W extending from both sides thereof for securely fixing the absorbent article 1 to the underwear when worn. The front region F may be a region from the starting point in front of the wing W to the front edge, and the rear region R may be a region from the starting point in the rear of the wing W to the rear edge. Further, when the wings W are provided, the position of the center Ac of the portion A corresponding to the bodily fluid outlet A in the longitudinal direction D1 is the midpoint of the longitudinal length of the lateral edges of the wings W. It can be a position.

Although the absorbent article 1 has the wings W, W in the form of FIG. 1, the absorbent article 1 may have no wings W, W. In that case, when the wings W are formed at the positions where the wings W are conventionally formed, the front region from the starting point of the front of the wings W is defined as the front region F, and the rear of the wings W is defined as the front region F. A rear region R can be defined as a region behind the starting point of .

As the back sheet 2, a sheet material having at least water impermeability, 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 in which a waterproof film is interposed to substantially ensure liquid impermeability can be used. Moreover, from the viewpoint of preventing stuffiness, it is more desirable to use a material having moisture permeability. Such water-impermeable/moisture-permeable sheet materials are produced by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. A porous sheet or the like can be used.

The surface sheet 3 is a liquid-permeable sheet that allows bodily fluids such as menstrual blood, vaginal discharge, and urine to quickly pass therethrough. As the surface sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used. The material fibers that make up the nonwoven fabric include, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cupra, blended fibers thereof, and natural fibers such as cotton. It can be used in combination of two or more. Examples of nonwoven fabric processing methods include spunlace, spunbond, thermal bond, meltblown, needle punch, and the like. Among these processing methods, the spunlace method is preferable because it can produce a soft nonwoven fabric, the spunbond method is preferable because it can produce a nonwoven fabric with excellent drapeability, and the thermal bonding method is preferable because it can produce a bulky and soft nonwoven fabric. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can also be used.

The absorbent 4 interposed between the backsheet 2 and the topsheet 3 is not limited as long as it can absorb and retain bodily fluids, but it preferably contains cotton-like pulp and a water-absorbing polymer. As the water-absorbent polymer, superabsorbent polymer granules, superabsorbent polymer fibers, and combinations thereof can be used. The pulp includes chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Broad-leaved trees, softwoods, and the like are used as raw materials for chemical pulp, and softwoods are preferably used because of their long fiber length.

Synthetic fibers may also be mixed in the absorber 4 . 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. can also be used. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath can also be used. It is also possible to use hydrophobic fibers surface-treated with a hydrophilizing agent to impart affinity to body fluids.

The absorber 4 is preferably manufactured by a piling or airlaid method. The absorber 4 as a whole does not have to have a uniform thickness over the front surface, and the body fluid discharge port corresponding portion 50 and its neighboring region, and the widthwise central portion from the crotch corresponding region M to the rear region R bulge out. It can also be a structure.

At the front and rear edge portions of the absorbent body 4, the outer edges of the backsheet 2 and the topsheet 3 are joined by adhesive such as hot melt, heat sealing, ultrasonic sealing or other bonding means. On the sides of the absorbent body 4, the side nonwoven fabrics 7, 7 provided along the longitudinal direction D1 on both sides of the topsheet 3 side and the backsheet 2 are joined by the above-mentioned adhesive means. The above wings W, W are formed by.

The side non-woven fabric 7 is made of a non-woven fabric material that has undergone appropriate water-repellent treatment or hydrophilic treatment in order to prevent permeation of bodily fluids or to improve touch feeling. The side nonwoven fabric 7 can be made of natural fibers, synthetic fibers, regenerated fibers, or the like. For the water-repellent treatment of the side non-woven fabric 7, a silicon-based, paraffin-based, or other water-repellent agent can be used.

As shown in FIG. 1, the absorbent body 4 in this embodiment has a back side absorbent layer 5 on the lower side (on the side of the back sheet 2) and a front side absorbent layer 6 on the upper side (on the side of the top sheet 3). ing. Since the absorber 4 is composed of two layers in this way, it is possible to provide each layer with a different function.

3 shows, from the front side of the absorbent article 1 in FIG. The view is shown after part of the body layer 6 has been removed. As shown in FIG. 3, the rear absorbent layer 5 is provided with a pair of belt-like high density portions 5H, 5H spaced apart in the width direction (second direction) D2. The belt-like high density portion 5H is a portion of the back side absorbent layer 5 where the density of the absorbent is locally increased. In other words, there is a density difference of the absorber between the strip-shaped high-density portion 5H and the portion adjacent to the strip-shaped high-density portion 5H.

In the illustrated embodiment, a low density portion 5L is formed in the rear absorbent layer 5 other than the pair of strip-like high density portions 5H, 5H. The low-density portion 5L is a portion having a relatively low density with respect to the band-shaped high-density portion 5H. If the low-density portion 5L as a whole has a lower density than the strip-shaped high-density portion 5H, and at least the density of the portion adjacent to the strip-shaped high-density portion 5H is lower than that of the strip-shaped high-density portion 5H, then in the low-density portion 5L Portions with different densities may be formed. For example, as will be described later, body compressed grooves (grooves formed by compressing the body) are formed in the entire body 8 including the low-density portion 5L, and the relatively high-density portion in the low-density portion 5L is localized. may be formed intentionally.

Capillary action remarkably occurs in the high-density portion of the absorbent, because the gap through which the liquid can pass is narrower than in the low-density portion. As such, bodily fluids discharged into the body 8 tend to be drawn from areas of low density to areas of high density. In this embodiment, the pair of strip-shaped high-density portions 5H, 5H with increased density is formed in the back side absorbent layer 5, so body fluids are easily drawn into the strip-shaped high-density portions 5H. Therefore, if the surface-side absorbent layer 6 is in contact with the strip-shaped high-density portion 5H, the body fluid absorbed by the front-side absorbent layer 6 of the absorbent body 4 is transferred from the surface-side absorbent layer 6 to the strip-shaped high-density portion 5H. and can be directly drawn in. Further, even if the front side absorbent layer 6 is not directly in contact with the strip high density portion 5H, the portion (lower area) where the strip high density portion 5H of the back side absorbent layer 5 is not formed from the front side absorbent layer 6. Body fluids that permeate the high-density portion 5L) can be drawn into the belt-like high-density portion 5H in the back side absorbent layer 5 .

Since the band-shaped high-density portion 5H is formed in a band-like shape along the longitudinal direction D1, body fluid drawn into the band-shaped high-density portion 5H is easily guided forward and backward along the longitudinal direction D1. Therefore, side leakage can be prevented, and the front and rear regions of the elongated absorbent body can be effectively used.

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

In this embodiment, the strip-shaped high-density portion 5H allows body fluids to be guided and 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 plane direction is conspicuously visible from the surface, the user may feel uneasy that it may leak, but according to this embodiment, such uneasy feeling is reduced. be able to.

As shown in FIG. 3, the pair of strip-shaped high-density portions 5H, 5H are formed at least in the region M corresponding to the crotch with a predetermined distance d1 therebetween. Therefore, it is possible to provide a configuration in which there is no high-density portion at a location within the distance d1, that is, at a location near the bodily fluid outlet corresponding portion A or the center Ac of the bodily fluid outlet corresponding portion A. As a result, the flexibility of the portion corresponding to the body fluid discharge port A or the portion near the center Ac of the body fluid discharge corresponding portion A in the region M corresponding to the crotch area can be maintained. Among the parts of the body that come into contact with the absorbent article, the bodily fluid discharge port and its surroundings are particularly delicate parts, so the wearing comfort is improved by not forming a high-density part in the part of the absorbent body corresponding to those parts. be able to. In addition, since the portion near the longitudinal center line CL is not densely packed, the vicinity of the longitudinal center line CL tends to swell toward the skin when worn, and the fit can be improved.

The width between the pair of high-density belt portions 5H, 5H, that is, the distance d1 in the width direction (second direction D2) between the pair of high-density belt portions 5H, 5H in the region M corresponding to the crotch is 10 to 30 mm. may be, preferably between 12 and 25 mm. When the distance d1 is 10 mm or more, the flexibility of the portion A corresponding to the body fluid outlet or the portion near the center Ac of the portion A corresponding to the body fluid outlet can be ensured. When the distance d1 is 30 mm or less, the strip-shaped high-density portion 5H that guides the body fluid does not move too far outward in the width direction, and delay in arrival of the body fluid to the strip-shaped high-density portion 5H can be prevented.

The distance between the pair of strip-shaped high-density portions 5H, 5H can be d1 or more in the entire longitudinal direction, that is, in the region other than the groin region M (front region F and/or rear region R). Accordingly, in the front region F and/or the rear region R, it is possible to prevent the absorber from becoming hard near the longitudinal center line CL and impairing the wearing comfort.

As shown in FIG. 3, the belt-like high-density portion 5H has a belt-like planar shape with a predetermined width. The width (the length in the second direction D2) of each strip-shaped high density portion 5H may be 5 to 25 mm, preferably 8 to 15 mm. By setting the width of the strip-shaped high-density portion 5H to 5 mm or more, the force for drawing body fluid into the strip-shaped high-density portion 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 band-shaped high-density portion 5H to 25 mm or less, it is possible to prevent the area of the high-density portion from becoming excessively large and the rigidity of the absorbent body to be excessively increased, thereby ensuring a good wearing feeling. .

The width of the band-shaped high-density portion 5H is constant from the front to the rear in the illustrated embodiment, but may vary. For example, the width of the strip-shaped high-density portion 5H can be made larger the closer it is to the longitudinal ends of the absorbent article (the closer it is to the front or the rear). Thereby, the function of guiding the absorbed body fluid forward and backward in the longitudinal direction can be enhanced. At least one of the widthwise inner edge and the widthwise outer edge of the belt-like high-density portion 5H may have a non-linear portion, such as a zigzag or wavy portion.

In the illustrated embodiment, the strip-shaped high-density portion 5H extends across the longitudinal direction D1 of the back-side absorbent layer 5. As shown in FIG. That is, the front ends 5Ha, 5Ha and the rear ends 5Hb, 5Hb of the pair of strip-shaped high density portions 5H, 5H reach the front and rear ends of the back side absorbent layer 5 (absorbent body 4 and main body 8). As a result, the function of guiding bodily fluid forward and backward by the band-shaped high-density portion 5H can be enhanced. However, the front end portion 5Ha and the rear end portion 5Hb of the band-shaped high density portion 5H terminate at positions longitudinally inner than the front end and the rear end of the back side absorbent layer 5, and the length of the absorbent body 4 in the longitudinal direction D1 is equal to the length D1 in the longitudinal direction. It may be shorter than the length. For example, the length in the longitudinal direction D1 of the belt-like high-density portion 5H can be 3/4 or more, preferably 5/6 or more, of the length in the longitudinal direction D1 of the absorbent body 4 .

As described above, the belt-like high density portion 5H is a portion having a relatively higher density than the surrounding area, that is, a portion having a relatively higher density than the adjacent low density portion 5L. The density of the strip-shaped high-density portion 5H is not particularly limited as long as the strip-shaped high-density portion 5H has a function of drawing body fluids from the low ^- density portion 5L. It is preferably 60 to 100 kg/m ³ , more preferably 60 to 100 kg/m 3 .

Further, the density of the low-density portion 5L is preferably 25-60 kg/m ³ .

The densities of the band-shaped high-density portion 5H and the low-density portion 5L may be average values of densities when the densities are different within the band-shaped high-density portion 5H or within the low-density portion 5L.

In this specification, the values of the density and thickness of the absorber (the back side absorber layer and the front side absorber layer) are the values in the state where the body compression groove (fit embossment) described below is not provided. be able to.

Also, in this specification, the density of the absorbent can be measured as follows. A portion to be measured (a portion not provided with fit embossing) is cut out to an arbitrary size from the absorbent body, and the area is measured. In addition, the cut-out portion is weighed and the thickness is measured. The density is calculated from the area, thickness and weight thus measured.

The thickness can be measured, for example, using a thickness measuring instrument (“Peacock” manufactured by Ozaki Seisakusho Co., Ltd., model number: FFD-7). In addition, when the density of the front-side absorbent layer or the back-side absorbent layer is to be obtained, the layer to be measured is peeled off and cut into an arbitrary size, and each value is measured as described above to calculate the density. . When comparing the densities of the front-side absorbent layer and the back-side absorbent layer in a predetermined portion of the absorbent body, each layer is peeled off from the cut absorbent body portion and measured.

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

FIG. 4 shows a form having a belt-like high density portion 5H formed by pressing. FIG. 4 is a cross-sectional view partially showing the absorbent body 4 taken along line II in FIG. As shown in FIG. 4, the back-side absorbent layer 5 is formed with a recess extending from the front surface side to the back surface side, and a band-shaped high-density portion 5H is formed at that position. That is, in the illustrated embodiment, the band-shaped high density portion 5H has a higher density than the low density portion 5L, but a smaller thickness. By forming the compressed grooves in this way, it is possible to form the belt-like high-density portion 5H. Since the band-shaped high-density portion 5H is formed by pressing (compression), the absorbent body is easily deformed with the band-shaped high-density portion 5H as a base point when worn, so that the region near the longitudinal center line CL is on the skin side. It becomes easier to swell, and the effect of improving fit is also obtained.

In addition, when the belt-shaped high-density portion 5H is compressed, the thickness of the belt-shaped high-density portion 5H may be 20 to 70% of the thickness 100% of the state before compression, and is about 30 to 55%. and preferred.

In FIG. 4, examples of bodily fluid flow are indicated by arrows. In the absorbent body 4 as shown in FIG. 4, body fluid discharged to the front side passes through the front side absorbent layer 6 and diffuses into the back side absorbent layer 5 by capillary action, gravity, or the like. Then, the bodily fluid that reaches the back side absorbent layer 5 moves from the low density portion 5L to the belt-like high density portion 5H, and further along the longitudinal direction (perpendicular to the paper surface) of the belt-like high density portion 5H. It can diffuse to the front and back of the side absorbent layer 5 .

In the embodiment shown in FIG. 4, the band-like high-density portion 5H of the back-side absorbent layer 5 is formed so that compressed grooves are formed on the front side by pressing the absorbent layer from the front side. However, the compressed grooves may be formed by compressing the absorbent layer from the back side. In this case, the strip-shaped high-density portion 5H and the surface-side absorbent layer 6 can be configured to be in contact with each other, and the transfer of body fluids from the surface-side absorbent layer 6 to the strip-shaped high-density portion 5H can be further promoted. . Also, the band-shaped high-density portion 5H can be formed by squeezing from both the front surface and the back surface.

In manufacturing the back side absorbent layer 5, an absorbent layer having a uniform thickness and density is prepared, and another absorbent layer piece having the same shape as the portion where the strip-like high density portion 5H is to be formed is formed into a strip-like high density portion. It is also possible to laminate the portion where the portion 5H is to be formed, and at least press the portion where the other absorbent layer piece is laminated. In this case, by adjusting the pressing conditions, the thickness of the back side absorbent layer 5 is made uniform, that is, the thickness of the band-shaped high density portion 5H and the other portion (low density portion 5L) are made equal. can also

Also, when stacking fibers, the absorbent layer is formed so that the basis weight (thickness) of the portion where the belt-like high-density portion 5H is desired to be formed is larger (thickness is increased), and at least the portion with the increased basis weight is squeezed. , the back side absorbent layer 5 having the band-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 then combined. For example, the absorber layer is formed only in the region excluding the portion where the pair of strip-shaped high-density portions 5H, 5H is desired to be formed, and then the high-density absorbent layer formed in the shape of the pair of strip-shaped high-density portions 5H, 5H is formed. Absorbent layer pieces can be fitted. In addition, an absorber layer having a uniform thickness is formed, and a part of the surface side in the range where the pair of belt-like high density parts 5H, 5H is desired to be formed is hollowed out, and the absorber is separately formed with high density. Layer strips can also be embedded. In this case, the materials used for the absorbers (fiber diameter, length, particle diameter, shape, etc. contained in the absorbers) may be different between the band-shaped high-density portion 5H and the low-density portion 5L. Also in this case, the thickness of the pair of belt-like high density portions 5H, 5H and the low density portion 5L can be the same or different.

Although the structure of the surface-side absorbent layer 6 is not particularly limited, the density of the surface-side absorbent layer 6 can be uniform as a whole, and as described later, a relatively small portion of the surface-side absorbent layer 6 can be It can also be used to induce bodily fluids by changing the density. However, it is preferable that the front-side absorbent layer 6 does not have a belt-like high-density portion formed in the back-side absorbent layer 5 . As a result, it is possible to prevent the diffusion in the surface direction in the surface side absorbent layer 6 from being conspicuous through the surface sheet 3 .

The density of the front-side absorbent layer 6 can be the same as the density of the low-density portion 5L of the back-side absorbent layer 5, or can be lower than the density of the low-density portion 5L. When the density of the front-side absorbent layer 6 is lower than the density of the low-density portion 5L of the back-side absorbent layer 5, drawing body fluids from the front-side absorbent layer 6 to the back-side absorbent layer 5 can be promoted. can. The density of the surface-side absorbent layer 6 is preferably 20-80 kg/m ³ , more preferably 25-50 kg/m ³ .

The thickness of the entire absorbent body 4 can be in the range of 0.3 to 30 mm, preferably in the range of 1.0 to 15 mm.

The thickness of the back-side absorbent layer 5 (thickness of the low-density portion 5L) is preferably 1.0 to 5.5 mm, more preferably 1.5 to 3.0 mm. When the band-shaped high-density portion 5H is formed by pressing, the thickness of the band-shaped high-density portion 5H is preferably 0.5 to 3.5 mm, more preferably 1.0 to 2.0 mm. The thickness of the surface-side absorbent layer 6 is preferably 1.0 to 5.5 mm, more preferably 1.5 to 3.0 mm. The thickness of the back side absorbent layer 5 and the thickness of the front side absorbent layer 6 may be the same or different. When the thickness of the surface-side absorbent 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 side absorber layer 5 is large, it is preferable from the viewpoint that diffusion in the longitudinal direction can be further promoted.

The area of the front-side absorbent layer 6 may be the same as or different from that of the back-side absorbent layer 5 as long as it overlaps the pair of strip-shaped high-density portions 5H, 5H. Moreover, the front-side absorbent layer 6 preferably covers the entire pair of strip-shaped high-density portions 5H, 5H.

FIG. 5 shows a form provided with a pair of strip-shaped high-density portions 25H, 25H as a modification of the strip-shaped high-density portion. 5 shows, from the front side of the absorbent article 20, the side nonwoven fabric, the top sheet, the wrapping sheet, and the top side absorbent layer 26, which is the layer on the top side of the absorbent body (top sheet side), in the same manner as in FIG. The view is shown after part has been removed. The embodiment of FIG. 5 differs from the embodiment of FIG. 3 in that the front end portions 25Ha, 25Ha and the rear end portions 25Hb, 25Hb of the pair of belt-like high density portions 25H, 25H are curved outward in the width direction. With this configuration, the bodily fluid drawn into the band-shaped high-density portion 25H can be diffused obliquely forward and obliquely rearward of the back side absorbent layer 5, and the absorbent can be efficiently utilized.

FIG. 6 partially shows an absorbent article 30 according to another form. FIG. 6 is a view after removing part of the side nonwoven fabric, the top sheet, the wrapping sheet, and the top side absorbent layer 36 from the top side of the absorbent article 30 . FIG. 6 shows the back absorbent layer 35 placed on the back sheet 32 and the front absorbent layer 36 placed on the back absorbent layer 35 .

The embodiment of FIG. 6 has the same basic configuration as the embodiment of FIG. It is different in that it is divided into high density portions 35Hr and 35Hr. As shown in FIG. 6, the pair of front high-density strip portions 35Hf, 35Hf are arranged forward of the center Ac of the body fluid outlet corresponding portion A, and the pair of rear high-density strip portions 35Hr, 35Hr are: It is preferable that it is arranged behind the center Ac of the portion A corresponding to the bodily fluid discharge port. By separating the pair of belt-shaped high-density portions into the front and rear portions in this way, it is possible to form a portion without the high-density portion in the body fluid outlet corresponding portion A and its vicinity, even when viewed in the longitudinal direction. Therefore, the softness of the absorbent body can be ensured in the portion A corresponding to the body fluid discharge port and in the vicinity thereof. As a result, it is possible to effectively improve the feeling of wearing by increasing the flexibility and cushioning properties of the absorbent body in the body fluid discharge port corresponding portion and the surrounding portion that come into contact with the portion when worn.

As shown in FIG. 6, the pair of front high-density band portions 35Hf, 35Hf have front ends 35Hfa, 35Hfa and rear ends 35Hfb, 35Hfb. Also, the pair of rear high-density band portions 35Hr, 35Hr has front ends 35Hra, 35Hra and rear ends 35Hrb, 35Hrb. The pair of front high-density strip portions 35Hf, rear end portions 35Hfb, 35Hfb of 35Hf and the front end portions 35Hra, 35Hra of the pair of rear high-density strip portions 35Hr, 35Hr respectively include body fluid outlet corresponding portions A. It is positioned within the region M corresponding to the crotch region. As a result, even if the position or range in which body fluid is discharged is slightly deviated within the crotch region M, at least the pair of front strip-shaped high-density portions 35Hf, 35Hf and the pair of rear strip-shaped high-density portions 35Hr, 35Hr On the other hand, the discharged bodily fluids can be reliably delivered, so that the bodily fluids can be favorably guided to at least one of the front and the rear.

The longitudinal distance d2 between the rear end portion 35Hfb of the front high-density belt portion 35Hf and the front end portion 35Hra of the rear high-density belt portion 35Hr is preferably 10 to 40 mm, more preferably 20 to 30 mm. . When the distance d2 is 10 mm or more, the flexibility and cushioning properties of the absorbent body can be improved. On the other hand, when the distance d2 is 40 mm or less, the discharged bodily fluid can be reliably reached by the rear end portion 35Hfb of the front high-density strip portion 35Hf and the front end portion 35Hra of the rear high-density strip portion 35Hr, Bodily fluids can be guided longitudinally.

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

FIG. 7 partially shows the configuration of an absorbent article 40 according to another form. FIG. 7 is a view after removing part of the side nonwoven fabric, the top sheet, the wrapping sheet, and the top side absorbent layer 46 from the top side of the absorbent article 40. FIG. FIG. 7 shows the back absorbent layer 45 placed on the back sheet 42 and the front absorbent layer 46 placed on the back absorbent layer 45 . Also, FIG. 8 shows a cross-sectional view taken along line II-II of FIG.

The back-side absorbent layer 45 shown in FIG. 7 has the same configuration as the back-side absorbent layer 5 shown in FIG. That is, as shown in FIG. 7, the back side absorbent layer 45 is provided with a pair of strip-like high density portions 45H, 45H. , they 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 absorbent body 44 . However, this embodiment differs from the embodiment shown in FIG. 3 in that a pair of body fluid guide portions 46C, 46C are formed in the surface side absorbent layer 46. As shown in FIG.

As shown in FIGS. 7 and 8, the pair of body fluid guide portions 46C, 46C is provided in the crotch corresponding region M including the body fluid outlet corresponding portion A. As shown in FIGS. As a result, body fluid discharged to a certain extent within the crotch region M can be drawn into the pair of body fluid guiding portions 46C, 46C in the surface side absorbent layer 46. As shown in FIG.

Furthermore, it is preferable that the pair of body fluid guide portions 46C, 46C respectively overlap with the pair of strip-shaped high density portions 45H, 45H in top view. As a result, body fluid drawn into the pair of high-density portions 46H, 46H can be easily guided to the pair of band-like high-density portions 45H, 45H located thereunder. Also, the pair of body fluid guide portions 46C, 46C are formed within the range of the pair of high density band portions 45H, 45H, respectively. It is more preferable if it is formed.

The pair of body fluid guide portions 46C, 46C can be a portion (high density portion) having a higher density than portions other than the body fluid guide portion 46C. In that case, the density of the body fluid guide portions 46C, 46C is preferably 40-110 kg/m ³ , more preferably 50-90 kg/m ³ . Moreover, it is preferable that the density of the bodily fluid guide portions 46C of the front-side absorbent layer 46 is lower than the density of the band-like high-density portions 45H of the back-side absorbent layer 45 . This facilitates transfer of body fluid from the body fluid guiding portion 46C to the belt-like high density portion 45H of the lower back side absorbent layer 45. As shown in FIG.

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

Further, when the body fluid guide portion 46C is a high density portion, the body fluid guide portion 46C can be formed by the same method as the belt-shaped high density portion of the back side absorbent layer 46. FIG. That is, the high density portion 46H can be a compressed groove. Moreover, in the illustrated embodiment, the shape of the pair of body fluid guide portions 46C, 46C is rectangular, but may be another shape. For example, it may be circular, elliptical, square, polygonal such as pentagonal or hexagonal, star-shaped, heart-shaped, teardrop-shaped, or the like.

In addition, the bodily fluid guide portion 46C is not limited as long as it has a configuration that can quickly guide bodily fluids to the back side absorbent layer 45, and may be a through hole, for example.

FIG. 9 shows a top view of an absorbent article 50 according to another form. The absorbent article 50 shown in FIG. 9 has the same basic configuration as the absorbent article 1 shown in FIG. A pair of belt-like high density portions 55H, 55H having an increased density are formed in the back side absorbent layer 55. As shown in FIG. However, in the embodiment shown in FIG. 9, the main body compressed grooves (also referred to as fit embossments) FE recessed from the topsheet side to the backsheet side are formed in the main body 58, which is different from that of the absorbent article 1 shown in FIG. different from

The body compressed groove FE is a narrow groove-shaped compressed portion having a width of about 1.0 to 2.0 mm in a direction perpendicular to the extending direction of the groove. The body compression groove FE can have a function of collecting bodily fluid in the body compression groove FE and guiding it along the body compression groove FE. Further, when worn, the main body 58 can be deformed with the main body compression groove FE as a base point so that the body fluid outlet corresponding portion A and its vicinity swell toward the skin side, so that the absorbent article 50 can be brought into close contact with the skin. and prevent leakage.

In the form of FIG. 9, the body compressed grooves FE are symmetrically formed with the longitudinal centerline CL as a symmetrical line. The main body compression groove FE includes at least a pair of groin corresponding area compression grooves FE1, FE1 extending longitudinally beyond the groin corresponding area M forward and rearward. In the illustrated embodiment, the pair of groin-corresponding-region compressed grooves FE1, FE1 extend so as to project 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 depressed inward in the width direction), or may be linear.

As shown in FIG. 9, the pair of crotch-corresponding region compressed grooves FE1, FE1 may overlap the pair of strip-shaped high-density portions 55H, 55H of the back-side absorbent layer 55 in plan view. In addition, it is preferable that the groin corresponding region compressed grooves FE1, FE1 do not extend beyond the pair of belt-like high-density portions 55H, 55H in a plan view. That is, it is preferable that the pair of strip-like high density portions 55H, 55H be arranged on the inner side in the width direction of the width direction outer edges of the pair of strip-like high density portions 55H, 55H of the back side absorbent layer 55 . As a result, it is possible to prevent the body fluid that moves along the crotch-corresponding region compressed grooves FE1, FE1 and is absorbed by the absorbent body 54 from diffusing outward in the width direction of the strip-like high-density portion and becoming more likely to leak. .

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

Claims (7)

An absorbent article comprising a substantially elongated body having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body provided between the topsheet and the backsheet, wherein ,
The absorbent body has a back-side absorbent layer arranged on the back-sheet side and a front-side absorbent layer arranged on the top-sheet side,
The back side absorbent layer has a pair of strip-shaped high density portions extending substantially in the longitudinal direction,
The width between the pair of belt-shaped high-density parts is 10 to 30 mm in the region corresponding to the crotch of the wearer when worn, and
The absorbent article , wherein the pair of strip-shaped high-density portions has a rear end portion and a front end portion curved outward in the width direction. An absorbent article comprising a substantially elongated body having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body provided between the topsheet and the backsheet, wherein ,
The absorbent body has a back-side absorbent layer arranged on the back-sheet side and a front-side absorbent layer arranged on the top-sheet side,
The back side absorbent layer has a pair of strip-shaped high density portions extending substantially in the longitudinal direction,
The width between the pair of belt-shaped high-density parts is 10 to 30 mm in the region corresponding to the crotch of the wearer when worn, and
The pair of high density strips includes a pair of front high density strips and a pair of rear high density strips,
a rear end portion of the pair of front strip-shaped high-density portions and a front end portion of the pair of rear strip-shaped high-density portions are in the region corresponding to the groin;
The absorbent article , wherein the distance in the longitudinal direction between the rear end portions of the pair of front strip-shaped high density portions and the front end portions of the pair of rear strip-shaped high density portions is 10 to 40 mm. 3. The absorbent article according to claim 2 , wherein rear ends of said pair of front strip-shaped high density portions and front ends of said pair of rear strip-shaped high density portions are curved inward in the width direction. 4. The absorbent article according to any one of claims 1 to 3 , wherein the strip-shaped high density portion has a width of 5 to 25 mm. The absorbent article according to any one of claims 1 to 4 , wherein the pair of strip-shaped high-density portions are formed by pressing. The surface-side absorbent layer has a bodily fluid guiding portion,
The absorbent article according to any one of claims 1 to 5 , wherein the bodily fluid guiding portion overlaps the pair of strip-shaped high-density portions in plan view in the crotch region. The main body is provided with a pair of main body compression grooves extending substantially longitudinally and recessed from the top sheet side to the back sheet side,
The absorbent according to any one of claims 1 to 6 , wherein the pair of main body compressed grooves are arranged in the region corresponding to the crotch width direction inside from the width direction outer edges of the pair of belt-shaped high density portions. Goods.

Images