JP2019201871A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article excellent in diffusibility of urine and the like. SOLUTION: The absorbent article 1 has a front-back direction y and a width direction x, and has a topsheet 2, a backsheet 3 and an absorbent core 4 arranged between them. A plastic plate 11 having a thickness of 200 μm or more is arranged between the back sheet 3 and the back sheet 3. The plastic plate 11 divides the absorbent core 4 into three equal parts in the front-rear direction y into a front side portion F, a rear side portion R, and an intermediate portion M therebetween, and the front side portion F and / or the rear side of the absorbent core 4. It is preferably arranged between the portion R and the backsheet 3 and not arranged between the intermediate portion M of the absorbent core 4 and the backsheet 3. [Selection diagram] Fig. 3

Description

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

  Conventionally, an absorbent article having a top sheet, a back sheet, and an absorbent body disposed between them, and diffused between the absorbent body and the back sheet in order to enhance diffusibility and liquid absorbency of urine and the like Absorbent articles provided with a sheet or a diffusion layer are known. For example, Patent Literature 1 discloses an absorbent article in which a diffusion sheet having high liquid permeability is arranged on the back surface of an absorbent body in which a through-hole portion is formed so as to cover the pore portion. Discloses an absorbent article in which a nonwoven fabric diffusion layer is provided between an absorbent body having an opening and a backsheet so as to overlap the opening.

JP 2008-284190 A JP2012-040260A

  As described above, conventionally, various absorbent articles have been proposed in order to improve the diffusibility and liquid absorbency of urine and the like. This invention is made | formed in view of the said situation, The objective is to provide the absorbent article excellent in diffusibility, such as urine.

  The absorbent article of the present invention that has solved the above-mentioned problems is an absorbent article having a front and back direction and a width direction, and having a top sheet, a back sheet, and an absorbent core disposed therebetween. And it is characterized in that a plastic plate having a thickness of 200 μm or more is disposed between the absorbent core and the back sheet. In the absorbent article of the present invention, since a plastic plate having a thickness of 200 μm or more is disposed between the absorbent core and the back sheet, urine etc. received by the absorbent article permeate the absorbent core and part thereof When it reaches the plastic plate, urine or the like tends to spread in the plane direction on the surface. At this time, by using a plastic plate having a thickness of 200 μm or more, wrinkles are hardly formed on the surface of the plastic plate, and the smoothness of the surface is easily maintained. Therefore, the absorbent article of the present invention is excellent in diffusibility of urine and the like.

  The absorbent core is divided into a front side portion, a rear side portion, and an intermediate portion therebetween by dividing the absorbent core into three equal parts in the front-rear direction, and the plastic plate is separated from the front side portion and / or the rear side portion of the absorbent core. It is preferably disposed between the sheets and not disposed between the intermediate portion of the absorbent core and the back sheet. Although the plastic plate has a certain degree of rigidity, the fitting property of the absorbent article at the crotch portion of the wearer of the absorbent article can be improved by not placing the plastic plate at a position overlapping the intermediate portion of the absorbent core. In addition, since the middle part of the absorbent core is at a position corresponding to the vicinity of the wearer's urination opening, it is expected that urine etc. will diffuse naturally due to the presence of a large amount of urine etc. without providing a plastic plate. it can. On the other hand, the front side portion and / or the rear side portion of the absorbent core has a smaller amount of urine and the like than the middle portion, so that the diffusion effect of urine and the like by providing the plastic plate is more effective. become.

  The absorbent core is provided with an opening extending in the front-rear direction, and the plastic plate is preferably arranged so as to overlap with the front end and / or the rear end of the opening. If the plastic plate is arranged in this way, after the urine diffused in the opening portion of the absorbent core reaches the front side end or the rear side end of the opening, it further travels along the surface of the plastic plate and from the front side end of the opening. Also, it becomes easier to spread rearward than the front or rear end.

  It is preferable that the plastic plate does not extend forward and backward than the absorbent core. Thereby, it can prevent that an absorbent article becomes hard more than necessary and the touch falls in the part in which the absorptive core of the front-and-back end part of an absorbent article does not exist.

  The plastic plate preferably has a bending resistance by a cantilever method in accordance with JIS L 1096 of 50 mm to 200 mm. As a result, wrinkles and distortion are less likely to occur on the plastic plate, and when the absorbent article is worn, the rigidity is not increased excessively at the portion where the plastic plate is provided, and the wearer does not feel uncomfortable.

  The plastic plate preferably has a bending resistance by a cantilever method in accordance with JIS L 1096 in the front-rear direction larger than that in the width direction. Thereby, even when wrinkles are formed on the surface of the plastic plate, the wrinkles are easily formed so as to extend in the front-rear direction of the absorbent article, and diffusibility of urine or the like in the front-rear direction is ensured.

  A fiber sheet is arranged on the absorbent core side of the plastic plate, and the fiber sheet covers a region of the center 50% in the front-rear direction and the center 50% in the width direction of the surface of the plastic plate on the absorbent core side, and It is preferably not joined to the region but joined to the plastic plate at other portions. By providing the fiber sheet on the absorbent core side of the plastic plate in this way, urine and the like are easily spread in the gap between the plastic plate and the fiber sheet, and the diffusibility of urine and the like is increased.

  The fiber sheet is preferably composed of a nonwoven fabric, and the constituent fibers of the nonwoven fabric are preferably oriented in the front-rear direction. In this case, urine etc. easily diffuses in the front-rear direction in the fiber sheet, and when the urine etc. on the plastic plate contacts the fiber sheet, the urine etc. diffuses in the front-rear direction along the fiber orientation direction of the fiber sheet. It becomes easy to do.

  The fiber sheet is preferably composed of a spunlace nonwoven fabric or an air-through nonwoven fabric. Since spunlace nonwoven fabric and air-through nonwoven fabric can be formed with a relatively low bulk density, they are excellent in permeability of urine and the like. Therefore, the urine etc. which permeate | transmitted the absorptive core become easy to permeate | transmit a fiber sheet, and can improve the spreading | diffusion effect | action of urine etc. by a plastic plate.

  In the absorbent article of the present invention, since a plastic plate having a thickness of 200 μm or more is disposed between the absorbent core and the back sheet, urine or the like received by the absorbent article permeates the absorbent core and a part thereof When it reaches the plastic plate, urine or the like tends to spread in the plane direction on the surface. At this time, by using a plastic plate having a thickness of 200 μm or more, wrinkles are hardly formed on the surface of the plastic plate, and the smoothness of the surface is easily maintained. Therefore, the absorbent article of the present invention is excellent in diffusibility of urine and the like.

The structural example of the laminated body by which the fiber sheet was provided in the absorptive core side of the plastic board is shown, Fig.1 (a) represents the perspective view of the said laminated body, FIG.1 (b) shows in Fig.1 (a) II represents a cross-sectional view of the laminated body. The other structural example of the laminated body by which the fiber sheet was provided in the absorptive core side of the plastic plate is shown, Fig.2 (a) represents the perspective view of the said laminated body, FIG.2 (b) is FIG.2 (a). II-II sectional drawing of the laminated body shown in FIG. The top view which looked at the urine pad from the top sheet side as an example of the absorbent article of this invention is represented. The IV-IV sectional view of the absorptive article shown in Drawing 3 is expressed.

  The absorbent article of the present invention has a top sheet, a back sheet, and an absorbent core disposed therebetween, and a plastic plate is disposed between the back sheet and the absorbent core. The absorbent article of the present invention can be applied to, for example, disposable diapers, urine pads (including incontinence pads), sanitary napkins and the like.

  The absorbent article 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. The width direction means a direction that is on the same plane as the absorbent article and is orthogonal to the front-rear direction, and corresponds to the left-right direction of the wearer when the absorbent article is worn. Further, a parallel direction to a plane formed from the front-rear direction and the width direction is a plane direction, and a vertical direction is a thickness direction.

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

  In the case where the absorbent article is a disposable diaper, the disposable diaper includes, for example, a front abdomen, a back part, and a crotch portion that is positioned between them and provided with an absorbent core. As a disposable diaper, for example, an absorbent main body in which an absorbent core is disposed between a top sheet and a back sheet on the skin surface side of an outer layer member having a front abdomen, a back part, and a crotch part positioned therebetween May be provided. Moreover, as a disposable diaper, the laminated body by which the absorptive core was distribute | arranged between the top sheet | seat and the back sheet | seat may form a front part, a back part, and a crotch part located among these. The front abdomen corresponds to a part applied to the wearer's stomach when wearing the disposable diaper, and the back part corresponds to a part applied to the wearer's back when wearing the disposable diaper. A crotch part is located between a front part and a back part, and is corresponded to the part which hits a wearer's crotch.

  The disposable diaper is a tape type (open type) disposable diaper which is provided with a fastening member at the left and right side end portions of the back portion and is formed into a pants shape when worn by the fastening member, and the front and back portions A pants-type disposable diaper in which a waist opening and a pair of leg openings are formed by joining together.

  The top sheet is a sheet located on the wearer side when the absorbent article is worn, and is preferably liquid permeable. Examples of the top sheet include nonwoven fabrics formed from hydrophilic fibers such as cellulose, rayon, and cotton; and hydrophobic properties such as polyolefin (for example, polypropylene and polyethylene), polyester (for example, PET), and polyamide (for example, nylon). A non-woven fabric formed from fibers, in which the surface of hydrophobic fibers is hydrophilized with a surfactant, can be used. As the top sheet, a woven fabric, a knitted fabric, a perforated plastic film, or the like may be used.

  The back sheet is a sheet located on the side opposite to the wearer when the absorbent article is worn, that is, on the outside, and is preferably liquid-impermeable. As the back sheet, a non-woven fabric formed from hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, 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, it is preferable to use a spunbond nonwoven fabric, a point bond nonwoven fabric, an air-through nonwoven fabric, a melt blown nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, an SMS nonwoven fabric, or the like.

  The absorbent core is not particularly limited as long as it includes an absorbent material that can absorb excrement such as urine. As an absorptive core, the molded object which shape | molded the absorptive material in the predetermined shape can be used, for example. The absorbent core may be covered with a covering sheet such as a paper sheet (for example, tissue paper or thin paper) or a liquid-permeable nonwoven sheet. Examples of the absorbent material include hydrophilic fibers such as pulp fibers, and water-absorbing resins such as polyacrylic acid-based, polyaspartic acid-based, cellulose-based, and starch / acrylonitrile-based materials. In addition, 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 hydrophilized with a surfactant or the like in order to increase the affinity with urine or the like.

  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. Therefore, it is preferable that an absorptive core contains a hydrophilic fiber (especially pulp fiber) and a water absorbing resin. In this case, it is preferable to use, for example, a mixture of hydrophilic fibers mixed or dispersed in an aggregate of hydrophilic fibers.

  The absorbent core may be a sheet-like absorber. Examples of the sheet-like absorber include those formed so as to have a water-absorbing resin between nonwoven fabrics and have no pulp fibers. Since the sheet-like absorbent body thus formed has a water-absorbing resin between the nonwoven fabrics, a high absorption capacity can be realized. Moreover, since a sheet-like absorber does not have pulp fibers between nonwoven fabrics, it can be formed thin without being bulky.

  The absorbent core may be one using water-absorbing fibers as an absorbent material. Examples of the water-absorbing fiber include a fiber containing a protonated or salt-formed carboxyl group. For example, as disclosed in JP-B-52-42916, water-absorbing fibers can be obtained by hydrolyzing acrylic fibers and converting nitrile groups contained in the acrylic fibers into carboxyl groups. At this time, it is preferable that the carboxyl group contained in the water-absorbing fiber forms an alkali metal salt or an ammonia salt. Moreover, a water absorbing fiber can be manufactured by immersing a hydrophilic fiber in acrylic acid and precipitating acrylic acid on the fiber surface.

  The shape (planar shape) of the absorbent core is not particularly limited. The shape of the absorbent core may be appropriately determined according to the application, and examples thereof include a substantially rectangular shape, an hourglass shape, a gourd shape, and a battledore shape.

  The absorbent article is preferably provided with a pair of rising flaps on both sides in the width direction of the top sheet. Side flaps such as urine are prevented by the rising flap. The rising flap is provided so as to extend in the front-rear direction. The rising flap is preferably composed of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like.

  The rising flap has a base as a starting point for rising and a free end as a rising tip. And it is preferable to provide the elastic member for standing extending in the front-back direction between the base and the free end. The standing elastic member is fixed to the rising flap in the stretched state, and is formed so that the rising flap rises toward the wearer's skin by the contraction force of the standing elastic member. The standing elastic member is fixed to the rising flap by a known joining means such as an adhesive. The rising flap is formed, for example, by joining side sheets extending in the front-rear direction on both sides in the width direction of the top sheet, and providing a standing elastic member on the inner side in the width direction of the side sheet.

  A plastic plate is provided between the absorbent core and the backsheet. When the absorbent core is covered with the covering sheet, the plastic plate may be provided between the absorbent core and the covering sheet, and in this case, the plastic plate is also provided between the absorbent core and the back sheet. It will be. Of course, a plastic plate may be provided between the covering sheet and the back sheet.

  The plastic plate has a thickness of 200 μm or more, which can improve the diffusibility of urine and the like. To explain this, when the absorbent article receives urine or the like excreted from the wearer, the urine or the like passes through the absorbent core and part of it reaches the plastic plate. At this time, by selecting a plastic plate having a thickness of 200 μm or more as the plastic plate provided between the absorbent core and the back sheet, it is difficult for wrinkles to be formed on the surface of the plastic plate, and the smoothness of the surface is easily maintained. Therefore, urine or the like that has reached the plastic plate tends to spread in the planar direction on the surface.

  The plastic plate preferably has a certain degree of rigidity. From such a viewpoint, the thickness of the plastic plate is preferably 250 μm or more, more preferably 300 μm or more, further preferably 350 μm or more, and even more preferably 400 μm or more. . Although the upper limit of the thickness of a plastic plate is not specifically limited, For example, 1.5 mm or less is preferable, 1.2 mm or less is more preferable, and less than 1.0 mm is further more preferable. The thickness of the plastic plate can be measured using a thickness gauge (thickness measuring device). For example, using a thickness gauge manufactured by Teclock Co., Ltd., a plastic plate is sandwiched between the anvil and the measuring element of the thickness gauge, and the final pressure is measured to be 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.

  The plastic plate may be formed hard and cannot be bent, or may be formed soft to some extent and bendable. If the plastic plate is too hard, it may cause damage to the absorbent article (for example, breakage of the back sheet), or the absorbent article may be less fit to the skin where the plastic plate is placed. Therefore, it is preferable that the plastic plate be formed to be soft to some extent and bendable.

  The plastic plate is not made of a foam such as sponge, but is made of a solid material. Therefore, the plastic plate is preferably non-liquid-absorbing and liquid-impermeable. The plastic plate may be hydrophilic, hydrophobic or water repellent. In any case, it is preferable that the liquid can flow or move on the surface of the plastic plate.

  The plastic plate preferably has a bending resistance by a cantilever method in accordance with JIS L 1096 of 50 mm to 200 mm. If the plastic plate has such a bending resistance, the plastic plate is less likely to be wrinkled or distorted, and the rigidity of the plastic plate is not excessively increased when the absorbent article is worn. , Wearer is less likely to feel uncomfortable. The bending resistance of the plastic plate is more preferably 75 mm or more, further preferably 100 mm or more, more preferably 175 mm or less, and further preferably 150 mm or less. It is preferable that the plastic plate is formed in this way in both the width direction and the longitudinal direction. In addition, according to JIS L 1096 (2010) 8.21.1 method A cantilever method, the test piece is specified to have a length of about 150 mm, but the length of the reinforcing sheet used for the test is May be adjusted as appropriate. As for the bending resistance by the cantilever method, even if the length of the test piece exceeds 150 mm, the value of the bending resistance does not change basically. Therefore, if necessary, a reinforcing sheet with a length exceeding 150 mm can be tested. Can be used for pieces.

  The plastic plate is preferably easier to bend in the width direction than in the front-rear direction of the absorbent article. Specifically, in the plastic plate, the value of the bending resistance by the cantilever method according to JIS L 1096 in the front-rear direction of the absorbent article is larger than the value of the bending resistance by the same method in the width direction of the absorbent article. It is preferable. Thereby, even when wrinkles are formed on the surface of the plastic plate, the wrinkles are easily formed so as to extend in the front-rear direction of the absorbent article. Therefore, it becomes easy to ensure the diffusibility of urine and the like in the front-rear direction. In the plastic plate, for example, the value of the bending resistance in the front-rear direction is preferably 3 mm or more and more preferably 5 mm or more than the bending resistance value in the width direction. Examples of the method of forming the plastic plate so as to bend more easily in the width direction than the front-rear direction include a method of providing a groove or protrusion extending in the front-rear direction on the plastic plate or a cut extending in the front-rear direction on the plastic plate.

  The shape of the plastic plate is not particularly limited, but is preferably a substantially rectangular shape. It is preferable that the plastic plate has a certain length in the width direction and the front-rear direction of the absorbent article. Specifically, the plastic plate preferably has a length in the width direction of 30 mm or more, more preferably 50 mm or more, and further preferably 70 mm or more. The length of the plastic plate in the front-rear direction is preferably 30 mm or more, more preferably 50 mm or more, and further preferably 70 mm or more.

  The plastic plate may be arranged on the front side when the absorbent core is divided into three parts in the front-rear direction into the front side part, the rear side part, and the intermediate part between them, It may be arranged and may be arranged in the middle part. The plastic plate may be arranged so as to extend from the front side portion of the absorbent core to the rear side portion through the intermediate portion. The plastic plate is preferably not disposed between the intermediate portion of the absorbent core and the back sheet, but is disposed between the front side portion and / or the rear side portion of the absorbent core and the back sheet. Although the plastic plate has a certain degree of rigidity, the fitting property of the absorbent article at the crotch portion of the wearer of the absorbent article can be improved by not placing the plastic plate at a position overlapping the intermediate portion of the absorbent core. In addition, since the middle part of the absorbent core is at a position corresponding to the vicinity of the wearer's urination opening, it is expected that urine etc. will diffuse naturally due to the presence of a large amount of urine etc. without providing a plastic plate. it can. On the other hand, the front side portion and / or the rear side portion of the absorbent core has a smaller amount of urine and the like than the middle portion, so that the diffusion effect of urine and the like by providing the plastic plate is more effective. become.

  In the present invention, various lengths and positions of the absorbent article are defined in a state where the absorbent article is completely expanded. For example, when the elastic member is provided in the absorbent article, in a state where the elastic member is completely extended, that is, in a state where the elastic member is removed or the elastic member is cut finely and the contracting force of the elastic member is not expressed. Measure various lengths and positions of absorbent articles.

  The plastic plate is preferably arranged including a center line in the width direction of the absorbent article (a center line extending in the front-rear direction). That is, the plastic plate preferably extends from the center line in the width direction of the absorbent article to one side and the other side in the width direction. The plastic plate is also preferably provided between the base portions of the rising flaps provided on one side and the other side in the width direction, and is not provided outward in the width direction from the base portion of the rising flaps.

  It is preferable that the plastic plate does not extend forward and backward than the absorbent core. That is, it is preferable that the front end of the absorbent core does not extend forward and the rear end of the absorbent core does not extend rearward. Thereby, it can prevent that an absorbent article becomes hard more than necessary and the touch falls in the part in which the absorptive core of the front-and-back end part of an absorbent article does not exist. More preferably, the plastic plate does not extend outward beyond the outer edge of the absorbent core.

  The absorbent core is preferably provided with an opening extending in the front-rear direction. By providing the opening in the absorbent core, the diffusibility of urine and the like is increased in the portion where the opening is provided, and the absorbent core can contribute to absorption of urine and the like over a wider range. The opening is preferably formed so as to extend in the front-rear direction of the absorbent core, thereby increasing the diffusibility of the absorbent core in the front-rear direction, and the entire absorbent core is effectively absorbed by absorption of urine and the like. You can contribute. The opening extending in the front-rear direction means an opening having a shape longer in the front-rear direction than in the width direction. The opening is provided through the absorbent core in the thickness direction.

  The absorbent core may be provided with only one opening or a plurality of openings, but the number of openings provided in the absorbent core is preferably 3 or less, more preferably 2 or less. Only one is more preferred. In the case where only one opening is provided in the absorbent core, the opening is preferably provided in the center portion in the width direction of the absorbent core so as to extend in the front-rear direction. When two openings are provided in the absorbent core, the opening is not provided in the central portion in the width direction of the absorbent core, but on one side and the other side across the central portion in the width direction of the absorbent core, It is preferable that they are provided so as to extend in the front-rear direction. When three openings are provided in the absorbent core, it is preferable that the openings are provided so as to extend in the front-rear direction at the widthwise center portion and both sides of the absorbent core. In addition, the center part of the width direction of an absorptive core means the part extended in the front-back direction along the said center line including the center line of the width direction of an absorptive core.

  The length in the width direction of the opening is preferably 5% or more of the length in the width direction of the narrowest part of the absorbent core, more preferably 8% or more, further preferably 10% or more, 30% or less is preferable, 25% or less is more preferable, and 20% or less is more preferable. When two or more openings are provided, the total length in the width direction of the openings in the narrowest part of the absorbent core is preferably in such a ratio. The narrowest part of the absorbent core means the narrowest part except for both ends in the front-rear direction of the absorbent core. For example, when the absorbent core is divided into five equal parts in the front-rear direction In addition, it means a portion that is formed narrowest in the width direction, excluding the 1/5 portion on one side and the 1/5 portion on the other side in the front-rear direction. The width of the opening is also preferably 5 mm or more, more preferably 8 mm or more, preferably 35 mm or less, and more preferably 25 mm or less. When two or more openings are provided, the width of each opening is preferably in such a range.

  In the opening, the length in the front-rear direction is preferably 40% or more of the length in the front-rear direction of the absorbent core, more preferably 50% or more, further preferably 60% or more, and preferably 85% or less, 80% or less is more preferable, and 75% or less is more preferable. In addition, it is preferable that an opening is provided so that it may not contact the outer edge of an absorptive core, and, thereby, the shape retention property of an absorptive core is improved.

  When the absorbent core is formed in an hourglass shape, the opening is preferably provided at least in the hourglass-shaped constricted portion. That is, the absorbent core is preferably formed such that the front side portion and the rear side portion are wider than the intermediate portion, and the opening is provided at least in the intermediate portion. The opening may further extend to the front side and / or the rear side.

  When the opening is provided in the absorbent core as described above, the plastic plate is preferably arranged so as to overlap at least a part of the opening of the absorbent core. Since the diffusibility of urine and the like is increased in the opening portion of the absorbent core, if the plastic plate is arranged so as to overlap with the opening of the absorbent core, the urine diffused in the opening portion of the absorbent core travels through the plastic plate. This further facilitates diffusion between the absorbent core and the backsheet.

  The plastic plate is preferably arranged so as to overlap the front end and / or the rear end of the opening of the absorbent core. If the plastic plate is arranged in this way, after the urine diffused in the opening portion of the absorbent core reaches the front side end or the rear side end of the opening, it further travels along the surface of the plastic plate and from the front side end of the opening. Also, it becomes easier to spread rearward than the front or rear end. For example, the plastic plate is preferably provided so as to extend forward by 1 cm or more from the front end of the opening of the absorbent core, and extends backward by 1 cm or more from the rear end of the opening of the absorbent core. It is preferable to be provided.

  When the plastic plate is arranged so as to overlap the front end and / or the rear end of the absorbent core opening, the opening is provided so as to extend from the middle part of the absorbent core to the front side part and / or the rear side part. It is preferable that the plastic plate is not disposed in the middle part of the absorbent core, but is disposed in the front side part and / or the rear side part of the absorbent core. Since the opening formed in the intermediate part of the absorbent core has sufficient diffusibility without a plastic plate, it is not necessary to provide a plastic plate in the portion from the viewpoint of improving the diffusibility of urine or the like.

  A fiber sheet is preferably disposed on the absorbent core side of the plastic plate. By providing a plastic plate between the absorbent core and the back sheet and arranging a fiber sheet on the absorbent core side, the diffusibility of urine or the like on the plastic plate can be enhanced. To explain this, when the absorbent article receives urine or the like excreted from the wearer, the urine or the like passes through the absorbent core and part of it reaches the plastic plate. At this time, when the plastic plate is directly provided on the lower side of the absorbent core, urine or the like that reaches the plastic plate is easily absorbed by the absorbent core again before spreading in the plane direction on the surface of the plastic plate. . On the other hand, when the fiber sheet is provided on the absorbent core side of the plastic plate, urine and the like are easily spread in the gap between the plastic plate and the fiber sheet, and the diffusibility of urine and the like is increased. In addition, it is preferable that at least a part of the surface on the absorbent core side of the plastic plate is not joined to the fiber sheet from the viewpoint of improving diffusibility of urine or the like on the plastic plate. Moreover, it is preferable that the fiber sheet is joined to any part of the plastic plate and configured to be handled integrally with the plastic plate.

  In FIG. 1 and FIG. 2, the structural example of the laminated body which has arranged the fiber sheet on the absorptive core side of the plastic board was shown. 1 and 2, the arrow x represents the width direction of the absorbent article, the arrow y represents the front-rear direction of the absorbent article, and the arrow z represents the thickness direction of the absorbent article. With respect to the thickness direction z, z1 represents the absorbent core side, and z2 represents the backsheet side. 1 and 2, the fiber sheet 12 is disposed on the absorbent core side of the plastic plate 11. In FIG. 1, the fiber sheet 12 is provided only on the absorbent core side of the plastic plate 11, and in FIG. 2, the fiber sheet 12 is provided on the absorbent core side of the plastic plate 11, and in the width direction x of the fiber sheet 12. Both end portions are folded back to the back sheet side of the plastic plate 11.

  The fiber sheet 12 covers the region 14 of the center 50% in the front-rear direction y and the center 50% in the width direction x of the surface of the plastic plate 11 on the absorbent core side, and is not bonded to the region 14 at least. It is preferable that it is joined to the plastic plate 11 at other portions. As a result, a gap is formed between the plastic plate 11 and the fiber sheet 12 in the region 14 of the center 50% of the plastic plate 11 in the front-rear direction y and the center 50% in the width direction x. Diffusivity can be increased. The region of the center 50% in the front-rear direction y of the plastic plate 11 is 25% to 75% when the front end is 0% and the rear end is 100% as the relative position in the front-rear direction y of the plastic plate 11. An area within a range. The region of the center 50% in the width direction x of the plastic plate 11 is a range of 25% to 75% when one end is 0% and the other end is 100% as a relative position in the width direction x of the plastic plate 11. Means an area in

  In the above case, the fiber sheet 12 is bonded to at least a part of the peripheral portion surrounding the region 14 of the center 50% in the front-rear direction y and the center 50% in the width direction x of the surface on the absorbent core side of the plastic plate 11. Or what is necessary is just to join to the surface by the side of the back seat | sheet of the plastic board 11. In FIG. 1 (b), the fiber sheet 12 is joined at a joint 13 on the surface of the plastic plate 11 on the absorbent core side, and in FIG. 2 (b), the fiber sheet 12 is joined to the back sheet of the plastic plate 11. It is joined at the joint portion 13 on the side surface. The fiber sheet 12 can be joined to the plastic plate 11 by, for example, application of an adhesive or heat welding.

  It is preferable that urine or the like has enhanced diffusibility in the front-rear direction y on the plastic plate 11, and from this point of view, the fiber sheet 12 is a region in which the surface of the plastic plate 11 on the absorbent core side is covered in a non-bonded state. The range of the front-rear direction y is preferably 60% or more of the center of the plastic plate 11 in the front-rear direction y, more preferably 70% or more, and further preferably 80% or more. The fiber sheet 12 covers a region of the center 50% in the width direction x of the surface on the absorbent core side of the plastic plate 11 over substantially the whole in the front-rear direction y, and is not joined to the region. It may be joined to the plastic plate 11.

  In FIG. 1, the fiber sheet 12 is not bonded to the region of the center 50% of the width direction x of the plastic plate 11 over the entire front and rear direction y on the surface of the plastic plate 11 on the absorbent core side. It is joined to a part or all of a region of 50% on both sides in the direction x (that is, a region of 25% on one side including one end in the width direction x and 25% on the other side including the other end). In FIG. 2, the fiber sheet 12 is not bonded to the surface of the plastic plate 11 on the absorbent core side, but is bonded to a part (or all) of the surface of the plastic plate 11 on the back sheet side. It is preferable that both ends of the fiber sheet 12 in the width direction x are directly joined to the plastic plate 11, and particularly in FIG. 2, both ends of the fiber sheet 12 in the width direction x are surfaces on the back sheet side of the plastic plate 11. It is preferable that both ends of the fiber sheet 12 in the width direction x are spaced apart from each other on the back sheet side surface of the plastic plate 11.

  As the fiber sheet 12, a woven fabric, a knitted fabric, a nonwoven fabric, etc. can be used. In addition, from a viewpoint of improving the diffusibility to the front-back direction y, such as urine, it is preferable that the fiber sheet 12 is comprised from a nonwoven fabric, and the constituent fiber of the said nonwoven fabric is orientated in the front-back direction y. This makes it easy for urine or the like to diffuse in the front-rear direction y within the fiber sheet, and when the urine or the like on the plastic plate 11 comes into contact with the fiber sheet 12, the urine or the like is aligned along the fiber orientation direction of the fiber sheet 12. It becomes easy to diffuse in the front-rear direction y. The fiber sheet 12 is preferably liquid permeable.

  Examples of the nonwoven fabric in which the constituent fibers are oriented in one direction include a spunbond nonwoven fabric, an air-through nonwoven fabric, and a spunlace nonwoven fabric. The orientation direction of the constituent fibers of the nonwoven fabric can be confirmed by observing the surface of the nonwoven fabric with a microscope or the like. For example, in a spunbonded nonwoven fabric, the orientation direction of the constituent fibers is described as follows. A spunbonded nonwoven fabric can be obtained, for example, by melting a polymer raw material, extruding it from a spinneret, stretching it, and accumulating it on a conveyor belt or the like and forming it into a web shape. The webs (fibers) accumulated on the belt are arranged along the traveling direction of the conveyor belt. Therefore, in this case, the web (fiber) is oriented along the traveling direction (MD direction) of the conveyor belt. In the air-through nonwoven fabric, when the nonwoven fabric is manufactured, the orientation direction of the constituent fibers can be aligned by appropriately setting the method for collecting the raw short fibers at the time of forming the fiber mass and the method for opening the fibers at the time of forming the web. In the spunlace nonwoven fabric, when the nonwoven fabric is formed, the orientation of the constituent fibers can be aligned by depositing the fibers by controlling the flow of the water flow in which the short fibers are dispersed.

  The fiber sheet 12 is preferably composed of a spunlace nonwoven fabric or an air-through nonwoven fabric. Since spunlace nonwoven fabric and air-through nonwoven fabric can be formed with a relatively low bulk density, they are excellent in permeability of urine and the like. Therefore, the urine etc. which permeate | transmitted the absorptive core becomes easy to permeate | transmit the fiber sheet 12, and can improve the spreading | diffusion effect | action of urine etc. by the plastic board 11. FIG. In the spunlace nonwoven fabric and the air-through nonwoven fabric, the constituent fibers of the nonwoven fabric are preferably oriented in the front-rear direction y.

  Next, the absorbent article of the present invention will be described with reference to FIGS. 3 and 4 taking a urine pad as an example. FIG. 3 shows a plan view of a urine pad as viewed from the top sheet side as an example of the absorbent article of the present invention. FIG. 4 shows a cross-sectional view of the absorbent article shown in FIG. 3 taken along the line IV-IV. In the drawing, the arrow x represents the width direction, the arrow y represents the front-rear direction, and the arrow z represents the thickness direction. The absorbent article of the present invention is not limited to the embodiment shown in the drawings.

  The absorbent article 1 includes a top sheet 2, a back sheet 3, and an absorbent core 4 disposed therebetween. The top sheet 2 is disposed so as to face the skin of the wearer's crotch, and allows the excrement of liquid such as urine to pass through. Excrements such as urine that have passed through the top sheet 2 are accommodated in the absorbent core 4. The back sheet 3 prevents excrement from leaking outside.

  In the absorbent article 1, a plastic plate 11 having a thickness of 200 μm or more is disposed between the absorbent core 4 and the back sheet 3. By disposing such a plastic plate 11 between the absorbent core 4 and the back sheet 3, it is difficult for wrinkles to be formed on the surface of the plastic plate 11, and the smoothness of the surface is easily maintained. Urine or the like that has permeated and reached the plastic plate 11 is likely to spread in the plane direction on the surface of the plastic 11. Therefore, a larger part of the absorbent core 4 can contribute to absorption of urine and the like.

  When the absorbent core 4 is divided into three equal parts in the front-rear direction y, the front side F, the rear side R, and the intermediate part M between them, the plastic plate 11 has the front side F and / or It is preferably disposed between the rear side portion R and the backsheet 3 and not disposed between the intermediate portion M of the absorbent core 4 and the backsheet 3. Although the plastic plate 11 has a certain degree of rigidity, the plastic plate 11 is not disposed at a position where it overlaps the intermediate portion M of the absorbent core 4, so that the fit of the absorbent article 1 at the crotch portion of the wearer can be improved. Can be increased. Further, the middle part M of the absorbent core 4 can be expected to naturally diffuse urine and the like by being positioned in the vicinity of the wearer's urination port even if the plastic plate 11 is not disposed. On the other hand, since the front side portion F and / or the rear side portion R of the absorbent core 4 has a smaller amount of urine or the like than the intermediate portion M, the diffusion effect of urine or the like by providing the plastic plate 11 is more enhanced. It becomes effective.

  The absorbent core 4 is provided with an opening 5 extending in the front-rear direction y, and the plastic plate 11 is preferably disposed so as to overlap the front end and / or the rear end of the opening 5. In FIG. 3, only one opening 5 is provided in the central portion of the absorbent core 4 in the width direction x so as to extend in the front-rear direction y. If the plastic plate 11 is arranged in this way, after the urine diffused in the opening 5 of the absorbent core 4 reaches the front end or the rear end of the opening 5, the opening is further transmitted along the surface of the plastic plate 11. It becomes easy to spread to the back rather than the front side or rear side edge of 5 front side ends.

  The absorbent article 1 is preferably provided with rising flaps 6 on both sides of the skin surface in the width direction x. By providing the rising flap 6, side leakage of urine or the like is prevented. The rising flap 6 is formed by, for example, joining side sheets 7 extending in the front-rear direction y to both sides in the width direction x of the top sheet 2, so that the inner portion of the side sheet 7 in the width direction x (the rising flap 6 has risen). It is formed by providing the elastic member 8 in the vicinity of the upper end). By providing the side sheet 7 and the elastic member 8 in this way, the inner portion of the side sheet 7 in the width direction x rises toward the wearer's skin by the contraction force of the elastic member 8, and the rising flap 6 is formed. The

  It is preferable that the plastic plate 11 is provided between the bases 6B of the rising flaps 6 and is not provided outward in the width direction x from the bases 6B of the rising flaps 6. Thereby, when a wearer wears the absorbent article 1, it becomes difficult to memorize the uncomfortable feeling caused by providing the plastic plate 11.

1: Absorbent article (urine pad)
2: Top sheet 3: Back sheet 4: Absorbent core 5: Opening 6: Standing flap 11: Plastic plate 12: Fiber sheet F: Front side R: Rear side M: Middle part

Claims (9)

An absorbent article having a front-rear direction and a width direction, and having a top sheet, a back sheet, and an absorbent core disposed therebetween,
An absorbent article, wherein a plastic plate having a thickness of 200 μm or more is disposed between the absorbent core and the back sheet. The absorbent core is divided into a front side part, a rear side part, and an intermediate part between them by dividing into three equal parts in the front-rear direction,
The said plastic board is distribute | arranged between the front side part and / or back side part of the said absorptive core, and the said back sheet, It is not distribute | arranged between the intermediate part of the said absorptive core, and the said back sheet. Absorbent article as described in 1. The absorbent core is provided with an opening extending in the front-rear direction,
The absorbent article according to claim 1 or 2, wherein the plastic plate is disposed so as to overlap a front side end and / or a rear side end of the opening.   The said plastic plate is an absorbent article as described in any one of Claims 1-3 which is not extended ahead and back rather than the said absorptive core.   The absorbent article according to any one of claims 1 to 4, wherein the plastic plate has a bending resistance by a cantilever method in accordance with JIS L 1096 of 50 mm to 200 mm.   The said plastic board is an absorbent article as described in any one of Claims 1-5 in which the bending resistance by the cantilever method based on the said front-back direction JISL1096 is larger than the said bending resistance in the said width direction. A fiber sheet is arranged on the absorbent core side of the plastic plate,
The fiber sheet covers a region of the center 50% in the front-rear direction and the center 50% in the width direction of the surface of the plastic plate on the side of the absorbent core, and is not bonded to the region. The absorbent article as described in any one of Claims 1-6 joined to the said plastic plate.   The absorbent article according to claim 7, wherein the fiber sheet is composed of a nonwoven fabric, and the constituent fibers of the nonwoven fabric are oriented in the front-rear direction.   The absorbent article according to claim 7 or 8, wherein the fiber sheet is composed of a spunlace nonwoven fabric or an air-through nonwoven fabric.

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