JP2014097435A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which is excellent in diffusibility of urine or the like and in which lateral leakage hardly occurs.SOLUTION: An absorbent article 1 has a liquid permeable top sheet 2, a liquid impermeable back sheet 3, and an absorbent laminate 4 provided between them. The absorbent laminate 4 has a back and forth direction y and a width direction x, an upper side absorbent layer 5, and a lower side absorbent layer 7 from the side of a top sheet 2. The lower side absorbent layer 7 has an opening 8 extending in the back and forth direction y, whereas in the upper side absorbent layer 5, an almost V-shaped notch is formed in a front side edge 6. An inclined side part of the almost V-shaped shape is formed into a curve bulging toward a front side in the back and forth direction y, and the upper side absorbent layer 5 covers a rear side end of the opening 8.

Description

  The present invention relates to absorbent articles such as urine pads (including incontinence pads), disposable diapers, and sanitary napkins.

  Conventionally, in order to improve the diffusibility of urine etc. in an absorbent article, an absorbent article having an opening formed in an absorbent core is known. For example, Patent Document 1 has a top sheet, a back sheet, and an absorbent laminate provided between them, and the absorbent laminate has an upper absorbent layer and a lower absorbent layer as an absorbent core, An absorbent article having an opening (slit) formed in an absorbent layer is disclosed.

JP 2010-131206 A

  In the absorbent article disclosed in Patent Document 1, diffusibility of urine and the like is enhanced by an opening formed in the upper absorbent layer, and urine diffused through the opening is absorbed by the upper absorbent layer and the lower absorbent layer. . However, when a large amount of urine etc. is discharged from the wearer at a time, for example, if a large amount of urine etc. moves to the rear end of the opening at once, there is a risk that the urine etc. overflows and leaks sideways at the rear end of the opening. is there.

  This invention is made | formed in view of the said situation, The objective is to provide the absorbent article which is excellent in the diffusibility of urine etc. and is hard to carry out a side leak.

  The absorbent article of the present invention that has solved the above problems is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent laminate provided therebetween. The absorbent laminate has a front-rear direction and a width direction, and has an upper absorbent layer and a lower absorbent layer from the topsheet side, and the lower absorbent layer has an opening extending in the front-rear direction. The upper absorbent layer is characterized by covering the rear end of the opening. In the absorbent article of the present invention, urine etc. diffuses in the front-rear direction at the opening of the lower absorbent layer, and urine etc. diffused to the rear side of the opening is formed with the rear end of the opening covered with the upper absorbent layer. Stored in the pocket. Since urine or the like accommodated in the pocket is absorbed by the upper absorption layer and the lower absorption layer, urine or the like is rapidly absorbed. Furthermore, even if a large amount of urine etc. moves to the rear end of the opening at a time, urine etc. is returned to the front in the pocket, so that it is difficult for the urine etc. to overflow from the opening. Etc. are surely absorbed. Therefore, side leakage of urine or the like is less likely to occur.

  The upper absorbent layer is preferably provided so that the wearer's buttocks rest when the wearer of the absorbent article is seated. Therefore, the upper absorbent layer has a front side on the upper absorbent layer from the viewpoint of improving the diffusibility of urine and the like in the opening by ensuring a wider portion that does not cover the opening while allowing the wearer's buttocks to be placed when sitting. It is preferable that a notch is formed in the edge. Furthermore, it is preferable that the notch is formed substantially symmetrically with respect to the center line in the width direction.

  As the shape of the notch, a substantially V-shape can be mentioned. If the notch is substantially V-shaped, the area of the upper absorbent layer can be made larger. Therefore, it becomes easy to place the wearer's buttocks on the upper absorbent layer when sitting, and to increase the absorption capacity of the upper absorbent layer. Furthermore, when the notch is substantially V-shaped, the hypotenuse of the substantially V-shape is preferably a curved shape that swells forward in the front-rear direction. In this case, when the urine etc. received by the lower absorption layer shifts to the rear side, the urine etc. is easily guided inward in the width direction along the front side edge of the upper absorption layer, and side leakage of urine etc. occurs. Less likely to occur. Further, the curved shape of the oblique side of the substantially V-shaped notch formed on the front side edge of the upper absorbent layer is adapted to the left and right bulges of the wearer's buttocks, and the upper absorbent layer is seated on the upper absorbent layer when seated. It becomes easy to put.

  The lower absorbent layer preferably has two openings provided substantially symmetrically with respect to the center line in the width direction. If the opening is provided in this way, the compressive strength in the front-rear direction of the absorbent laminate increases, and the absorbent laminate can be easily held in a predetermined shape.

  The absorbent laminate is preferably formed in the lower absorbent layer such that the middle part in the front-rear direction is formed narrow and the opening extends in the front-rear direction at the narrowest part of the middle part. If the opening is formed in this way, urine etc. excreted from the wearer and received at the front side of the absorbent laminate easily diffuses to the rear side of the absorbent laminate beyond the crotch of the wearer. .

  The upper absorbent layer is preferably provided behind the narrowest part of the intermediate part of the absorbent laminate. If an upper side absorption layer is provided in this way, thickness will become thin in a wearer's crotch, and a wear feeling in a wearer's crotch will improve an absorptive article.

  Since the absorbent article of the present invention is excellent in diffusibility in the front-rear direction, the absorbent article can be formed with a narrow width at the crotch of the absorbent article (the part to which the wearer's crotch is applied). Specifically, the absorbent article can be formed such that the width of the narrowest portion of the intermediate portion of the absorbent laminate is 35% to 50% of the width of the absorbent laminate. If the absorbent article is formed in this manner, the absorbent article is less bulky in the wearer's crotch (between both thighs), and the fit in the wearer's crotch is also good. In addition, the wearer can easily move the thigh without a sense of incongruity.

  Between the lower absorbent layer and the backsheet, a non-woven fabric diffusion layer may be provided so as to overlap the opening. By providing the diffusion layer so as to overlap with the opening, urine or the like that has moved to the opening can easily diffuse through the diffusion layer through the opening.

  The diffusion layer preferably extends rearward from the rear end of the opening. In this case, urine or the like accommodated in the opening easily diffuses quickly through the diffusion layer to a portion behind the opening. Absorbent articles are generally formed so that the rear portion in the front-rear direction has a large area. If the diffusion layer extends rearward from the rear end of the opening, urine or the like is absorbed in the absorbent article. It becomes easy to move quickly to the rear side portion, which is a wider portion. Further, in the absorbent laminate, the upper absorbent layer is laminated on the lower absorbent layer behind the rear end of the opening, so that the absorption capacity of urine or the like is increased in that portion. Accordingly, urine and the like are easily absorbed by the absorbent laminate.

  It is preferable that the diffusion layer has a receiving portion that overlaps with the opening and a transfer portion that does not overlap with the opening, and the receiving portion is formed thicker than the transfer portion. If the diffusion layer is formed in this way, urine or the like that has passed through the top sheet is easily accommodated in the receiving portion of the diffusion layer in the opening.

  When a diffused layer is provided in an absorptive article and an absorptive article is formed narrowly in a crotch part, an absorptive layered product and a diffused layer may be constituted as follows. That is, an intermediate portion in the front-rear direction of the absorbent laminate is formed with a narrow width, and a plurality of openings are formed in the lower absorbent layer in parallel with the width direction so as to extend in the front-rear direction at the narrowest portion of the intermediate portion. The outer edge at the outermost part of the opening is formed in the region within 5 mm to 20 mm from the outer edge of the lower absorbent layer, and the outer edge at the outermost part of the diffusion layer is the opening. It is in a region within 3 mm from the outermost outer edge, and the diffusion layer may extend 10 mm or more rearward from the rear end of the opening. If the opening is formed in this way, while the compressive strength in the front-rear direction of the lower absorbent layer is ensured, the middle part receives the force from the outside in the width direction by the thighs between the wearer's crotch. Is distorted, and the width and shape of the intermediate portion are easily adapted to the wearer's crotch. In addition, if the diffusion layer is arranged in this way, it becomes difficult for urine or the like to diffuse to the outer edge of the lower absorption layer in the narrowest portion of the intermediate portion, and lateral leakage of urine or the like in the width direction is prevented. It becomes like this. Then, a larger amount of urine or the like accommodated in the opening can diffuse backward beyond the rear end of the opening.

  In the absorbent article of the present invention, since the rear end of the opening is covered with the upper absorbent layer to form a pocket, urine and the like are easily absorbed quickly in this pocket. In addition, even if a large amount of urine etc. moves to the rear end of the opening at a time, the urine etc. is returned to the front in the pocket, so that the urine etc. does not overflow from the opening and reliably It becomes easy to be absorbed. Therefore, side leakage of urine or the like is less likely to occur.

The top view which looked at the absorptive layered product from the top sheet side is expressed. The top view which looked at the absorbent article (urine pad) from the top sheet side as one embodiment of the absorbent article of this invention is represented. The III-III sectional view of the absorptive article shown in Drawing 2 is expressed. The IV-IV sectional view of the absorptive article shown in Drawing 2 is expressed. As other embodiment of the absorbent article of this invention, the top view which looked at the absorbent article (urine pad) from the top sheet side is represented. The VI-VI sectional view of the absorptive article shown in Drawing 5 is expressed. The VII-VII sectional view of the absorptive article shown in Drawing 5 is expressed. The enlarged view of the intermediate part of the front-back direction of the absorbent laminated body of the absorbent article shown in FIG. 5 is represented.

  The absorbent article of the present invention includes a top sheet, a back sheet, and an absorbent laminate provided therebetween. Examples of the absorbent article of the present invention include urine pads (including incontinence pads), disposable diapers, sanitary napkins and the like.

  The shape of the absorbent article is not particularly limited. When the absorbent article is, for example, a urine pad or a sanitary napkin, the shape of the absorbent article includes a substantially rectangular shape, an hourglass shape, a gourd shape, a battledore shape, and the like.

  When the absorbent article is a disposable diaper, the disposable diaper may be an open-type disposable diaper that is provided with a pair of fastening members on the left and right sides and formed into a pants shape when worn by the fastening member, and a waist opening And a pair of legged disposable diapers in which a pair of leg openings are formed.

  A top sheet is a sheet | seat located in the wearer side in the case of wear of an absorbent article, and the material will not be specifically limited if it is liquid-permeable. The back sheet is a sheet located on the side opposite to the wearer when the absorbent article is worn, that is, the outside, and the material is not particularly limited as long as it is liquid-impermeable. In the present invention, liquid impermeability includes the meaning of water repellency.

  Examples of the top sheet include a nonwoven fabric formed from hydrophilic fibers such as cellulose, rayon, and cotton; and a nonwoven fabric formed from hydrophobic fibers such as polypropylene, polyethylene, polyester, polyamide, and nylon. The surface of which is hydrophilized with a surfactant can be used. As the top sheet, a woven fabric, a knitted fabric, or a plastic film in which holes are formed may be used.

  As the back sheet, a nonwoven fabric formed from hydrophobic fibers such as polypropylene, polyethylene, polyester, polyamide, nylon, a plastic film, or the like can be used. Moreover, you may use the laminated body of a nonwoven fabric and a plastic film.

  When a nonwoven fabric is used as the top sheet or the back sheet, the nonwoven fabric is preferably manufactured by a spunbond method, an air-through method, a point bond method, a melt blow method, an airlaid method, or a combination of these production methods. Moreover, you may use the nonwoven fabric manufactured by SMS method which combined the spun bond method and the melt blow method.

  The absorbent laminate is provided between the top sheet and the back sheet and absorbs excrement such as urine. The absorbent laminate has an upper absorbent layer and a lower absorbent layer from the topsheet side. Preferably, the upper absorbent layer is provided adjacent to the lower absorbent layer.

  The absorbent laminate has a front-rear direction and a width direction. The front-rear direction means a direction extending in the front-rear direction of the wearer's crotch when the wearer wears the absorbent article. In the front-rear direction, a position applied to the wearer's ventral side is referred to as a front side, and a position applied to the wearer's back side is referred to as a rear side. The width direction means a direction that is on the same plane as the absorbent laminate and is orthogonal to the front-rear direction. Moreover, in this invention, the upper side means the wearer side at the time of wearing an absorbent article, and a lower side means the opposite side, ie, an outer side, from the wearer at the time of wearing an absorbent article. A direction extending from the upper side to the lower side is referred to as a vertical direction.

  The upper absorbent layer and the lower absorbent layer constituting the absorbent laminate are not particularly limited as long as they contain an absorbent material that can absorb excrement such as urine. As the upper absorbent layer and the lower absorbent layer, for example, a molded body obtained by shaping the absorbent material into a predetermined shape is used, or the absorbent material is a paper sheet (for example, tissue paper or thin paper), a liquid-permeable nonwoven fabric sheet, or the like. The one covered with the sheet member can be used. Examples of the absorbent material contained in the upper absorbent layer and the lower absorbent layer include hydrophilic fibers such as pulverized pulp fiber and cellulose fiber, polyacrylic acid-based, polyaspartic acid-based, cellulose-based, starch and acrylonitrile-based materials. And the like. The water-absorbing material may include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and heat-fusible fibers such as polyamide fibers. These heat-fusible fibers may be subjected to a hydrophilic treatment with a surfactant or the like in order to increase the affinity with body fluid such as urine.

  It is preferable that an absorptive material contains a hydrophilic fiber from the point which improves the absorption speed | rates, such as urine. Moreover, it is preferable that an absorptive material contains a water absorbing resin from the point which raises absorption capacity. As the absorbent material, for example, it is preferable to use a material in which a water-absorbing resin is mixed or dispersed in an aggregate of hydrophilic fibers.

  The shape (planar shape) of the absorbent laminate is not particularly limited. The shape (planar shape) of the upper absorbent layer and the lower absorbent layer is not particularly limited. What is necessary is just to determine the shape of an absorptive laminated body suitably according to a use, for example, a rectangle, an hourglass type, a gourd type, a battledore type etc. are mentioned.

  The absorbent laminate has an opening in which the lower absorbent layer extends in the front-rear direction, and the upper absorbent layer covers the rear end of the opening of the lower absorbent layer. Here, the structural example of an absorptive laminated body is demonstrated with reference to FIG. FIG. 1: represents the top view which looked at the absorptive laminated body from the top sheet side. In the drawings of the present application, the arrow x represents the width direction, the arrow y represents the front-rear direction, and the direction perpendicular to the plane formed by the arrows x, y represents the up-down direction z. Moreover, in FIG. 1, the upper side of the figure corresponds to the rear side of the absorbent article, and the lower side of the figure corresponds to the front side of the absorbent article.

  The absorbent laminate 4 has an upper absorbent layer 5 and a lower absorbent layer 7, and the lower absorbent layer 7 has an opening 8 extending in the front-rear direction y. Since the lower absorption layer 7 has the opening 8 extending in the front-rear direction y, urine or the like diffuses in the front-rear direction y through the opening 8.

  The shape of the opening 8 is not particularly limited as long as it extends in the front-rear direction y, but is preferably a shape that is longer in the front-rear direction y than the width direction x from the point of promoting diffusion of urine or the like in the front-rear direction y. In FIG. 1, the shape of the opening 8 is a round rectangle with long corners in the front-rear direction y. The shape of the opening 8 may be, for example, a rectangle, an ellipse, or a polygon. The opening 8 may have a shape in which the end in the front-rear direction y is curved outward in the width direction x. If the opening 8 has such a shape, urine or the like easily diffuses in the width direction x together with the front-rear direction y at the front end or rear end of the opening 8.

  The opening 8 is preferably arranged in the lower absorbent layer 7 so that when the absorbent article is worn, the vicinity of the urination part of the wearer faces. If the opening 8 is provided in this way, urine or the like excreted from the wearer is received by the opening 8 and the urine or the like received by the opening 8 is diffused in the front-rear direction y. Furthermore, as will be described later, the opening 8 is preferably arranged so that the portion where the upper absorbent layer 5 does not overlap faces the vicinity of the urination portion of the wearer.

  The opening 8 is, for example, a range in which the front end of the opening 8 is 15% to 40% when the front end is 0% and the rear end is 100% relative to the front-rear direction y of the absorbent laminate 4 ( More preferably, it is located in the range of 25% to 35%, and the rear end of the opening 8 is preferably located in the range of 60% to 90% (more preferably in the range of 62% to 75%). If the opening 8 is formed in this manner, when the absorbent article is worn, the opening 8 easily faces the vicinity of the urination portion of the wearer. If the rear end of the opening 8 is at a position of 60% or more from the front end of the absorbent laminate 4, urine etc. diffuses through the opening 8 in the front-rear direction y, and urine etc. is behind the absorbent laminate 4. It easily reaches the part. Therefore, urine or the like excreted from the wearer and received at the front side portion of the absorbent laminate 4 easily spreads to the rear side portion of the absorbent laminate 4 across the crotch of the wearer. Furthermore, if the front end of the opening 8 is at a position of 15% or more from the front end of the absorbent laminate 4, and the rear end of the opening 8 is at a position of 90% or less from the front end of the absorbent laminate 4, Even if urine or the like diffuses to the front side edge or the rear side edge of the opening 8, the urine or the like is suitably absorbed by the absorbent laminate 4, and the urine or the like is less likely to leak in the front-rear direction y.

  In FIG. 1, two openings 8 are provided, but the number of openings 8 is not limited to this. The number of openings 8 formed in the lower absorption layer 7 may be one, or three or more. However, it is preferable that two openings 8 are provided in parallel in the width direction x as shown in FIG. Thus, if the opening 8 is formed in the lower side absorption layer 7, an absorbent material will be provided between the two openings 8, and the compressive strength to the front-back direction y of the absorbent laminated body 4 will increase. Therefore, the absorptive laminated body 4 becomes easy to hold | maintain a predetermined shape. Moreover, by making the number of the openings 8 two, it becomes easy to form a wide width per opening, and the diffusibility in the front-rear direction y in the openings 8 is enhanced. From the viewpoint of easily holding the absorbent laminate 4 in a predetermined shape, it is more preferable that the two openings 8 are provided approximately symmetrically with respect to the center line in the width direction x.

  When two openings 8 are provided in parallel in the width direction x, the separation distance between the two openings 8 is preferably 10 mm or more, and 15 mm or more from the viewpoint of sufficiently securing the compressive strength in the front-rear direction y of the absorbent laminate 4. Is more preferable, and 20 mm or more is more preferable. Further, the width (length in the width direction) of each opening 8 is preferably 15 mm or more, more preferably 20 mm or more, preferably 40 mm or less, and more preferably 35 mm or less.

  The upper absorbent layer 5 is provided so as to cover the rear end of the opening 8 of the lower absorbent layer 7. As a result of the construction of the absorbent laminate 4, a pocket 9 that can accommodate urine and the like is formed at the rear end of the opening 8. The upper absorbent layer 5 is provided such that the front edge 6 crosses the opening 8, and the front edge 6 of the upper absorbent layer 5 forms the entrance of the pocket 9. By configuring the absorbent laminate 4 in this way, urine or the like is diffused in the front-rear direction y through the opening 8 in a portion where the opening 8 is not covered with the upper absorbent layer 5 (that is, the front side of the opening 8). Become. Urine or the like diffused in the front-rear direction y at the opening 8 of the lower absorbent layer 7 is accommodated in a portion where the opening 8 is covered by the upper absorbent layer 5, that is, the pocket 9, and the urine etc. accommodated in the pocket 9 is accommodated in the upper absorbent layer 5. And the lower absorption layer 7.

  Further, the absorbent laminate 4 is covered with the upper absorbent layer 5 at the rear end of the opening 8, so that even if a large amount of urine or the like moves to the rear end of the opening 8 at once, the urine etc. is moved back and forth in the pocket 9. Returning to the front in the direction y, urine and the like are reliably absorbed by the lower absorbent layer 7 and the upper absorbent layer 5 without overflowing from the opening 8. For example, when the rear end of the opening 8 is not covered with the upper absorbent layer 5, if a large amount of urine or the like moves to the rear end of the opening 8 at once, urine overflows at the rear end of the opening 8, and urine Or the like may not be absorbed by the lower absorbent layer 7 and side leakage may occur.

  The upper absorbent layer 5 is preferably provided so that the wearer's buttocks rest when the wearer of the absorbent article is seated. For example, when the wearer's buttocks are placed in the vicinity of the opening 8 and the upper absorbent layer 5 is not disposed on the portion of the absorbent laminate 4 on which the buttocks are placed, The buttocks squeeze strongly in the vicinity of the opening 8 of the lower absorbent layer 7 and urine or the like may return to the top sheet, which may deteriorate the feeling of wear. However, even if urine or the like diffuses through the opening 8 of the lower absorbent layer 7, if the upper absorbent layer 5 is arranged on the absorbent laminate 4 so that the wearer's buttocks rest on the upper absorbent layer 5 when sitting, The wearer is less likely to feel discomfort due to urine or the like returning in the vicinity of the buttocks that strongly presses the absorbent article, and the wearing feeling is improved.

  In order to make the upper absorbent layer 5 easy to be positioned so that the wearer's buttocks rest on the seat, when the front end of the absorbent laminate 4 is 0% and the rear end is 100%, the upper absorbent layer 5 It is preferable that the foremost part of the front edge 6 is located in a range of 58% or less (more preferably in a range of 55% or less) from the front end of the absorbent laminate 4. On the other hand, when the upper absorbent layer 5 does not cover the opening 8 too much, the diffusibility of urine or the like in the opening 8 is increased, so that the foremost part of the front edge 6 of the upper absorbent layer 5 is the front end of the absorbent laminate 4. To 42% or more (more preferably 45% or more). Moreover, if the foremost part of the front edge 6 of the upper absorbent layer 5 is located in a range of 42% to 58% from the front end of the absorbent laminate 4, the upper absorbent layer 5 covers the rear end of the opening 8. The pocket 9 is easily formed at the rear end of the opening 8.

  The upper absorbent layer 5 is preferably formed with a notch in the front edge 6 from the viewpoint of ensuring a wider portion that does not cover the opening 8 while allowing the wearer's buttocks to rest upon sitting. If a notch is formed in the front edge 6 of the upper absorbent layer 5, the front edge 6 is formed with a recessed portion on the rear side in the front-rear direction y. Therefore, in the part where the notch of the front side edge 6 is not formed or the part where the notch is shallowly formed, the left and right bulges of the wearer's buttocks hit the upper absorbent layer 5 and the upper absorbent layer 5 is seated on the upper absorbent layer 5 when sitting. It becomes easier to place the buttocks. On the other hand, in the part where the notch of the front side edge 6 is deeply formed, a larger part of the opening 8 is not covered with the upper absorbent layer 5 and the diffusibility of urine etc. in the opening 8 is improved.

  The notch formed in the front edge 6 of the upper absorbent layer 5 is preferably formed substantially symmetrically with respect to the center line in the width direction x. If the notch is formed in this way, the deepest part of the notch of the front edge 6 is likely to be located near the center line in the width direction x of the absorbent laminate 4. Therefore, the deepest part of the notch of the front edge 6 is easily located between the left and right bulges of the wearer's buttocks, and the left and right swollen portions of the wearer's buttocks can be easily placed on the upper absorbent layer 5 when seated. .

  When the notch in the front edge 6 of the upper absorbent layer 5 is formed substantially symmetrically with respect to the center line in the width direction x, the opening 8 of the lower absorbent layer 7 is approximately 2 in symmetry with respect to the center line in the width direction x. Are preferably provided. In this case, the absorptive material of the lower absorbent layer 7 is provided so as to overlap the deepest part of the notch in the front edge 6 of the upper absorbent layer 5. Therefore, even if urine or the like overflows from the pocket 9 at the rear end of the opening 8, the overflowed urine or the like is guided along the front side edge 6 of the upper absorbent layer 5 to the inner side in the width direction x and the lower absorbent layer. 7 moves to a portion where the absorbent material is present, and urine and the like are easily absorbed in the portion. Therefore, side leakage of urine or the like is less likely to occur.

  The shape of the notch formed in the front edge 6 is not particularly limited. Examples of the shape of the cutout include a substantially V shape, a substantially U shape, and a shape in which the base of the trapezoid is cut off, and a substantially V shape is preferable. If the shape of the notch is substantially V-shaped, the area of the upper absorbent layer 5 can be made larger when the depth of the notch is constant. Therefore, it becomes easier to place the wearer's buttocks on the upper absorbent layer 5 when sitting, and the absorption capacity of the upper absorbent layer 5 can be increased.

  As a substantially V-shaped notch, the notch need not be strictly V-shaped. For example, the V-shaped oblique side portion does not need to be configured from a straight line, and may be configured from a curved line. In addition, as a substantially V-shaped notch, a substantially V-shaped oblique side bulges forward in the front-rear direction y (inner side of the V-shape) from the viewpoint of increasing the area of the upper absorbent layer 5. A curved shape is preferred. In this case, the inclination of the hypotenuse part (the angle of the hypotenuse part with respect to the longitudinal direction y) becomes steeper as the substantially V shape approaches the valley part of the substantially V shape. When the substantially V-shaped notch is formed in the front edge 6 in this way, the front edge of the upper absorbent layer 5 when urine or the like received by the lower absorbent layer 7 moves to the rear side in the front-rear direction y. 6, urine and the like are easily guided inward in the width direction x, and side leakage of urine and the like is less likely to occur. Moreover, the curved shape of the oblique side portion of the substantially V-shaped notch formed in the front edge 6 is adapted to the left and right bulges of the wearer's buttocks so that the wearer's buttocks can be easily placed on the upper absorbent layer 5 when seated. Become.

  In FIG. 1, as described above, a notch is formed in the front edge 6 of the upper absorbent layer 5. That is, a substantially V-shaped notch is formed in the front edge 6 of the upper absorbent layer 5, and the oblique side of the substantially V-shape is formed by a curve that swells forward in the front-rear direction y. Further, the substantially V-shaped notch is formed substantially symmetrically with respect to the center line in the width direction x.

  Next, the structural example of the absorbent article which has the absorbent laminated body 4 demonstrated above is demonstrated with reference to FIGS. The present invention is not limited to the embodiments shown in the drawings. FIG. 2 is a plan view of a urine pad as an absorbent article as viewed from the top sheet side. FIG. 3 is a cross-sectional view taken along the line III-III of the absorbent article of FIG. 4 represents a cross-sectional view of the absorbent article of FIG. 2 taken along the line IV-IV. In FIG. 2, the upper side of the figure corresponds to the rear side of the absorbent article, and the lower side of the figure corresponds to the front side of the absorbent article.

  The absorbent article 1 (1A) includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent laminate 4 provided therebetween. The top sheet 2 is disposed so as to face the wearer's skin, and allows excretion such as urine to pass through. The excrement that has passed through the top sheet 2 is accommodated by the absorbent laminate 4. The back sheet 3 prevents excrement from leaking outside.

  The absorbent laminate 4 has a front-rear direction y and a width direction x, and has an upper absorbent layer 5 and a lower absorbent layer 7 from the top sheet 2 side. The lower absorbent layer 7 has an opening 8 extending in the front-rear direction y, and the upper absorbent layer 5 covers the rear end of the opening 8 (FIGS. 2 and 4). The opening 8 is formed in the lower absorbent layer 7 so as to face the vicinity of the wearer's urination portion. Urine or the like accommodated in the absorbent laminate 4 is absorbed by the lower absorbent layer 7 while diffusing in the front-rear direction y at the opening 8, and urine etc. reaching the rear end of the opening 8 is accommodated in the pocket 9. And absorbed by the upper absorbent layer 5 and the lower absorbent layer 7.

  In the absorbent article 1 </ b> A, rising flaps 10 extending in the front-rear direction y of the absorbent laminate 4 may be provided on both sides in the width direction x of the absorbent laminate 4. 2 and 3, the side sheet 11 extending in the front-rear direction y is joined to both sides in the width direction x of the top sheet 2, and the standing elastic member provided at the inner end of the side sheet 11 in the width direction x. The inner end of the side seat 11 rises toward the wearer's skin due to the contraction force of 12, thereby forming the rising flap 10. The rising flap 10 prevents lateral leakage of urine or the like in the width direction x. The side sheet 11 is composed of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like. Note that the inner surface of the end portion in the front-rear direction y of the rising flap 10 may be joined to the top sheet 2, thereby preventing leakage of urine or the like outward in the front-rear direction y.

  5 to 7 show another embodiment of the absorbent article of the present invention. FIG. 5: represents the top view which looked at the urine pad as an absorbent article from the top sheet side. 6 represents a VI-VI cross-sectional view of the absorbent article of FIG. FIG. 7 shows a VII-VII cross-sectional view of the absorbent article of FIG. In the following description, the description of the part which overlaps with the embodiment of FIGS.

  The absorbent article 1 (1B) shown in FIGS. 5 to 7 has the absorbent laminate 4 shown in FIG. The absorbent article 1B is the same as the absorbent article 1A shown in FIGS. 2 to 4 except that the diffusion layer 13 is provided between the absorbent laminate 4 and the back sheet 3.

  In the absorbent article 1 </ b> B, a non-woven fabric diffusion layer 13 is provided between the absorbent laminate 4 and the back sheet 3 so as to overlap the opening 8. The diffusion layer 13 may be provided so as to overlap at least the opening 8. By providing the diffusion layer 13 in this manner, urine or the like that has moved to the opening 8 easily diffuses through the diffusion layer 13 through the opening 8. Become.

  The material of the nonwoven fabric constituting the diffusion layer 13 is not particularly limited. For example, the nonwoven fabric is formed from hydrophilic fibers such as cellulose, rayon, and cotton; formed from hydrophobic fibers such as polypropylene, polyethylene, polyester, polyamide, and nylon. Nonwoven fabrics formed from hydrophobic fibers as exemplified above, where the surface of the hydrophobic fibers is hydrophilized with a surfactant can be used.

  A composite fiber may be used as the fiber constituting the nonwoven fabric of the diffusion layer 13. Examples of the composite fiber include a core-sheath composite fiber having a cross-sectional component arrangement in a core-sheath type, a parallel composite fiber having a cross-section component arrangement in a parallel type, and a radiation composite fiber having a cross-section component arrangement in a radial type. The components constituting the composite fiber preferably have different melting points, that is, preferably have a high melting point component and a low melting point component. If such a composite fiber is used, a nonwoven fabric can be easily manufactured by the air through method described later. In such a composite fiber, the fibers are fused together by the low melting point component, the rigidity is imparted to the fiber by the high melting point component, and the voids are easily formed favorably between the fibers constituting the nonwoven fabric. Therefore, the nonwoven fabric formed from the composite fiber is excellent in diffusibility of urine and the like. A core-sheath composite fiber is particularly preferably used as the composite fiber, and the core-sheath composite fiber preferably has a high-melting component disposed in the core and a low-melting component disposed in the sheath. The core-sheath composite fiber may have a core and a sheath that are concentric or eccentric.

  As the material of the composite fiber, a thermoplastic polymer may be used. For example, polyolefin such as polyethylene, polypropylene, polybutene-1, polyisobutylene; polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT). Or the like can be used. As materials for the hollow fiber, these exemplified materials may be used in combination. Among these, the combination of PET and polyethylene, the combination of polypropylene and polyethylene, and the combination of PET and polypropylene are preferable. In the case of the core-sheath composite fiber, a combination using PET for the core and polyethylene for the sheath, a combination using PET for the core and polypropylene for the sheath, and a combination using polypropylene for the core and polyethylene for the sheath are preferable. Among these, a combination of PET and polyethylene or a combination of PET and polypropylene is particularly preferable.

  Although the kind of nonwoven fabric which comprises the diffused layer 13 is not specifically limited, The nonwoven fabric obtained by a chemical bond method, the airlaid method, the air through method, and the spunlace method is preferable. If such a nonwoven fabric is used, it becomes easy to make the nonwoven fabric bulky. Moreover, the fiber gap which comprises a nonwoven fabric can be made comparatively large, and it becomes easy to improve the diffusibility, such as urine. As the nonwoven fabric constituting the diffusion layer 13, it is particularly preferable to use a nonwoven fabric (air-through nonwoven fabric) obtained by an air-through method.

The basis weight of the nonwoven fabric constituting the diffusion layer 13 is preferably 50 g / m ² or more, and more preferably 60 g / m ² or more. If the basis weight of the nonwoven fabric constituting the diffusion layer is 50 g / m ² or more, the diffusion layer 13 is formed to be relatively bulky and the diffusibility of urine or the like in the diffusion layer 13 is enhanced. On the other hand, when the fabric weight of the nonwoven fabric which comprises the diffusion layer 13 is too large, there exists a possibility that the thickness of an absorbent article may become thick and a wearing feeling may fall. Thus, the basis weight of the nonwoven fabric constituting the diffusion layer 13 is preferably from 200 g / m ² or less, more preferably 180 g / m ² or less.

  The fibers constituting the nonwoven fabric of the diffusion layer 13 preferably have a fineness of 4 dtex or more. In addition, that the fiber which comprises a nonwoven fabric has a fineness of 4 dtex or more means that a nonwoven fabric is comprised only from the fiber which has a fineness of 4 dtex or more substantially. The fineness is more preferably 5 dtex or more. Although the upper limit of the fineness of the fiber which comprises the nonwoven fabric of the diffusion layer 13 is not specifically limited, As a general upper limit of the fineness, 20 dtex or less is preferable and 10 dtex or less is more preferable. A non-woven fabric having a fineness of 4 dtex or more has a relatively large fiber diameter among non-woven fabrics used in absorbent articles. If the fibers constituting the nonwoven fabric of the diffusion layer 13 have a fineness of 4 dtex or more, the gaps between the fibers of the nonwoven fabric are increased, and the diffusibility of urine and the like is improved.

  The diffusion layer 13 preferably extends rearward from the rear end of the opening 8. In FIG. 5, the upper side of the figure corresponds to the rear side of the absorbent article, and in FIG. 7, the left side of the figure corresponds to the rear side of the absorbent article, but in the absorbent article 1 </ b> B, the diffusion layer 13 is the rear side of the opening 8. It extends backward from the end. If the diffusion layer 13 extends rearward from the rear end of the opening 8, urine or the like accommodated in the opening 8 easily diffuses quickly through the diffusion layer 13 to a portion behind the opening 8. In general, the absorbent article is often formed so that the rear portion in the front-rear direction has a wide area. If the diffusion layer 13 extends rearward from the rear end of the opening 8, urine or the like is absorbed. It becomes easy to move to the rear part which is a wider part of the property article quickly. Further, in the absorbent laminate 4, the upper absorbent layer 5 is laminated on the lower absorbent layer 7 behind the rear end of the opening 8, so that the absorption capacity of urine or the like is increased in that portion. Therefore, if urine or the like diffuses quickly from the rear end of the opening 8 to the rear, the urine or the like is quickly absorbed by the absorbent laminate 4.

  The diffusion layer 13 preferably further extends forward from the front end of the opening 8. If the diffusion layer 13 is provided in this way, urine or the like accommodated in the opening 8 is likely to diffuse quickly through the diffusion layer 13 further forward than the front end of the opening 8. Accordingly, urine and the like are quickly absorbed by the absorbent laminate 4.

  The diffusion layer 13 may be provided across the opening 8 in the width direction x. For example, in the absorbent article 1B, the diffusion layer 13 may extend inward from the inner edge in the width direction x of the opening 8 and extend outward from the outer edge in the width direction x of the opening 8. Also good. The diffusion layer 13 is preferably provided so as to cover the entire opening 8.

  When a plurality of openings are provided in parallel in the lower absorption layer, it is preferable that the diffusion layer is not provided far beyond the outer edge of the opening located at the outermost position in the width direction x. Specifically, it is preferable that the diffusion layer is not provided in a region exceeding 5 mm (more preferably a region exceeding 3 mm) outward from the outer edge of the opening located most outward in the width direction x. By providing the diffusion layer in this manner, urine and the like are hardly diffused in the width direction of the absorbent laminate, and side leakage of the urine and the like in the width direction is prevented.

  Each opening may be covered by one diffusion layer, and two or more diffusion layers may cover different regions of one opening. One diffusion layer may cover two or more openings. In addition, from the point which improves the diffusibility of urine etc. in a diffusion layer, it is preferable that the diffusion layer is continuously provided in one opening. Therefore, it is preferable that one or two or more openings are covered with one diffusion layer.

  In the diffusion layer 13, when the portion overlapping the opening 8 is a receiving portion and the portion not overlapping the opening 8 is a transfer portion, the receiving portion is preferably thicker than the transfer portion. If the receiving part is thicker than the transfer part, the diffusion layer 13 tends to have a shape in which the receiving part enters the opening 8. Therefore, urine or the like that has passed through the top sheet 2 is easily accommodated in the receiving portion of the diffusion layer 13 in the opening 8. Urine or the like accommodated in the diffusion layer 13 in the receiving part passes through the diffusion layer 13 and moves to the transfer part, and is absorbed by the absorbent laminate 4. As a result, rapid absorption of urine and the like can be realized.

  The thickness of the diffusion layer 13 is measured by a thickness gauge (thickness measuring machine) SM-130 manufactured by Teclock Co., Ltd. The diffusion layer 13 is taken out from the absorbent article, the diffusion layer 13 is sandwiched between an anvil of a thickness gauge and a measuring element, and the thickness of the receiving part and the transfer part of the diffusion layer 13 is measured. According to the thickness gauge SM-130, the thickness is measured so that the final pressure is 2.2 N or less. As the anvil and the measuring element, a contact surface with a measurement object is a circle having a diameter of 10 mm and a flat contact surface is used.

  Since the absorbent article of the present invention is excellent in diffusibility in the front-rear direction, it is possible to form a narrow width at the crotch part (part where the wearer's crotch is applied) of the absorbent article. That is, even if the absorbent article is formed narrow at the crotch portion, urine and the like are highly diffusible in the front-rear direction, so even if the absorbent article receives urine excreted from the wearer, urine etc. It quickly diffuses in the front-rear direction of the absorbent article, making it difficult for side leakage in the width direction. If the absorbent article is formed narrow at the crotch, the absorbent article is less bulky between the wearer's crotch (between both thighs), and the wearer can easily move the thigh without a sense of incongruity. Become. Therefore, such an absorbent article is excellent in wearing feeling.

  The absorbent articles 1A and 1B shown in FIG. 2 to FIG. 7 have a crotch portion narrower than a commercially available absorbent article (such as a disposable diaper or a urine pad). In the absorbent articles 1 </ b> A and 1 </ b> B, the absorbent laminate 4 has a narrow middle portion in the front-rear direction y. That is, the absorptive laminate 4 is formed such that a portion constricted in the width direction x is located in the intermediate portion. A wearer's crotch is applied to an intermediate portion of the absorbent laminate 4.

  The intermediate portion in the front-rear direction y of the absorbent laminate 4 means a portion formed between the front side portion and the rear side portion when the absorbent laminate 4 is divided into three in the front-rear direction y. For example, the front side portion, the intermediate portion, and the rear side portion occupy regions of 25%, 30%, and 45% of the length of the absorbent laminate 4 in the front-rear direction y, respectively.

  In FIG. 8, the enlarged view of the intermediate part of the absorbent laminated body 4 was shown about the absorbent article 1B shown in FIG. Moreover, in FIG. 8, the part enclosed with the dashed-dotted line circle is further enlarged and shown. In FIG. 8, the arrow 14 represents the width of the narrowest portion (the length in the width direction x) of the intermediate portion of the absorbent laminate 4, but the narrowest portion of the intermediate portion of the absorbent laminate 4. The width of the portion is preferably 35% to 50% (more preferably 40% to 50%) of the width of the absorbent laminate 4. The width of the absorbent laminate 4 means the maximum length of the absorbent laminate 4 in the width direction x. If the width of the narrowest part of the intermediate part of the absorbent laminate 4 is 50% or less of the width of the absorbent laminate 4, the absorbent article 1 has a sufficiently narrow width at the crotch, and absorbs The article 1 becomes less bulky between the wearer's groins. If the width of the narrowest part of the intermediate part of the absorbent laminate 4 is 35% or more of the width of the absorbent laminate 4, the absorbent article 1 is not excessively narrow between the wearer's crotch, and the absorbent The fit between the crotch of the wearer of the article 1 is good.

  The opening 8 is preferably formed in the lower absorbent layer 7 so as to extend in the front-rear direction y at the narrowest portion of the intermediate portion. If the opening 8 is formed in this way, the urine etc. excreted from the wearer and received at the front side part of the absorbent laminate 4 diffuses to the rear side part of the absorbent laminate 4 across the wearer's crotch. It becomes easy to do. In the absorbent articles 1A and 1B, the opening 8 is formed in the lower absorbent layer 7 in this way.

  The upper absorbent layer 5 is preferably provided behind the narrowest part of the intermediate part of the absorbent laminate 4. Specifically, the entire upper absorbent layer 5 is preferably provided behind the narrowest portion of the intermediate portion of the absorbent laminate 4. If the upper side absorption layer 5 is provided in this way, the absorbent laminated body 4 becomes thin in a wearer's crotch, and the wear feeling in the wearer's crotch of the absorbent article 1 is improved. In the absorbent articles 1A and 1B, the upper absorbent layer 5 is thus provided.

  In the case where a plurality of openings 8 are provided in parallel in the lower absorption layer 7, it is preferable that the opening 8 is formed near the outer edge of the lower absorption layer 7 in the narrowest portion of the intermediate portion. If the opening 8 is formed in this way, the intermediate portion is a force from the outside in the width direction x by the thighs between the wearer's crotch while securing the compressive strength in the front-rear direction y of the lower absorbent layer 8. When received, the opening 8 is distorted, and the width and shape of the intermediate portion are easily adapted to the wearer's crotch.

  Specifically, when a plurality of openings 8 are provided in parallel in the lower absorbent layer 7, the opening 8 is the narrowest part of the middle part, and the outer edge on the outermost side of the opening 8 is the lower absorbent layer. It is preferable that it exists in the area | region of 5 mm or more and 20 mm or less from the outer edge of 7. There are a total of two outer edges on the outermost side of the opening 8 on one side and the other side (right side and left side) in the width direction x. Accordingly, when a plurality of openings 8 are provided in the narrowest portion of the intermediate portion, on one side or the other side across the center line in the width direction x (center line extending in the front-rear direction y) with respect to the width direction x The outer edge located on the outermost side (the outer edge of the opening 8) is the outer edge located on the outermost side of the opening 8. In FIG. 8, the length between the outer edge of the outermost side of the opening 8 and the outer edge of the lower absorbent layer 7 in the narrowest part of the middle part in the front-rear direction y of the absorbent laminate 4 is indicated by an arrow 15. It is represented. And it is preferable that the length of the part represented by the arrow 15 is 5 mm-20 mm. If the outer edge on the outermost side of the opening 8 is in a region of 5 mm or more from the outer edge of the lower absorbent layer 7, the lower side is sufficient to maintain the opening 8 outward from the outer edge on the outermost side of the opening 8. Absorption layer 7 (absorbent material) comes to exist. If the outer edge on the outermost side of the opening 8 is in a region within 20 mm from the outer edge of the lower absorbent layer 7, the lower absorbent layer 7 located on the outer side of the outer edge on the outermost side of the opening 8 It becomes easy to distort with respect to the external force. Accordingly, the width and shape of the intermediate portion are easily adapted to the wearer's crotch.

  When a plurality of openings 8 are provided in parallel in the lower absorption layer 7 and the opening 8 is formed near the outer edge of the lower absorption layer 7 in the narrowest part of the middle part, In order to promote diffusion and prevent lateral leakage in the width direction x, the diffusion layer 13 is preferably provided as follows. That is, the outermost edge of the diffusion layer 13 in the narrowest portion of the intermediate portion is in a region within 3 mm (more preferably, a region within 2 mm) from the outermost edge of the outermost portion of the opening 8. The layer 13 preferably extends from the rear end of the opening 8 to the rear by 10 mm or more (more preferably 20 mm or more). When the diffusion layer 13 is arranged in this way, the diffusion layer 13 does not extend to the outer edge of the lower absorption layer 7 in the narrowest portion of the intermediate portion. Accordingly, urine or the like hardly diffuses to the outer edge of the lower absorption layer 7 in the portion, and side leakage of the urine or the like in the width direction x is prevented. Then, a larger amount of urine or the like accommodated in the opening 8 diffuses backward beyond the rear end of the opening 8.

  There are a total of two outer edges on the outermost side of the diffusion layer 13 on one side and the other side (right side and left side) in the width direction x. When a plurality of diffusion layers 13 are provided in the narrowest part of the intermediate part, the one side or the other side across the center line in the width direction x (center line extending in the front-rear direction y) is the most in the width direction x. The outer edge located on the outer side (the outer edge of the diffusion layer 13) is the outer edge located on the outermost side of the diffusion layer 13. In FIG. 8, the length between the outermost edge of the diffusion layer 13 and the outermost edge at the outermost side of the opening 8 in the narrowest portion of the intermediate portion in the front-rear direction y of the absorbent laminate 4 is as follows. It is represented by an arrow 16. And it is preferable that the length of the part represented by the arrow 16 is 3 mm or less. As shown in FIG. 8, the outermost edge of the diffusion layer 13 may be further outward in the width direction x than the outermost edge of the opening 8 and is at the outermost side of the diffusion layer 13. The outer edge and the outer edge at the outermost side of the opening 8 may coincide with each other, and the outermost edge at the outermost side of the diffusion layer 13 is inward in the width direction x than the outer edge at the outermost side of the opening 8. May be.

  The absorbent article of the present invention can be suitably applied to an absorbent article having a narrow crotch like the absorbent articles 1A and 1B shown in FIGS. 2 to 7, but other absorbent articles. Of course it can also be applied.

1: Absorbent article (urine pad)
2: Top sheet 3: Back sheet 4: Absorbent laminate 5: Upper absorbent layer 7: Lower absorbent layer 8: Opening

Claims (6)

An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent laminate provided therebetween,
The absorbent laminate has a front-rear direction and a width direction, and has an upper absorbent layer and a lower absorbent layer from the topsheet side,
The lower absorbent layer has an opening extending in the front-rear direction,
The upper absorbent layer has a substantially V-shaped notch formed at a front edge, and the substantially V-shaped oblique side portion is formed in a curved shape bulging forward in the front-rear direction.
The absorbent article, wherein the upper absorbent layer covers a rear end of the opening.   The absorbent article according to claim 1, wherein the upper absorbent layer is formed so that the notch of the front side edge is substantially symmetrical with respect to the center line in the width direction.   The absorbent article according to claim 1, wherein the lower absorbent layer has two openings that are substantially symmetrical with respect to the center line in the width direction. The absorbent laminate has a narrow middle portion in the front-rear direction,
The said opening is an absorbent article as described in any one of Claims 1-3 currently formed in the said lower side absorption layer so that it may extend in the said front-back direction in the narrowest part of the said intermediate part.   The absorbent article according to claim 4, wherein the entire upper absorbent layer is provided behind the narrowest portion of the intermediate portion of the absorbent laminate.   The absorbent article according to claim 4 or 5, wherein the width of the narrowest portion of the intermediate portion of the absorbent laminate is 35% or more and 50% or less of the width of the absorbent laminate.

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