Disposable diapers

Abstract

To provide a disposable diaper that prevents liquid from leaking on the back side and also prevents bedsores.SOLUTION: A disposable diaper includes a laminate having liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet. The disposable diaper includes an abdominal part, a back part, and a crotch part connecting between the abdominal part and the back part and having a small width. In the back part, between the top sheet and the back sheet, an absorbent sheet, different from the absorber, is disposed in a sheet form. The absorbent sheet is disposed closer to the back side than the absorber.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a disposable diaper, and more particularly to a disposable diaper that can suppress back leakage and bedsores. [Background technology]

[0002] Disposable diapers have been known in the past that have a front abdominal section, a rear section, and a narrow crotch section connecting the front abdominal section and the rear section. Techniques for preventing back leakage and the like have been proposed for such disposable diapers.

[0003] For example, Patent Document 1 describes a disposable diaper in which a rod-shaped barrier body that protrudes toward the body extends widthwise on at least one of the upper back and upper ventral ends (see Patent Document 1 (Claim 1, paragraph 0080)). Patent Document 2 describes a disposable diaper in which a barrier means for preventing the outflow of excrement is provided on the skin-contacting surface of at least the rear waist region of the front and rear waist regions, extending in a circumferential direction around the region (see Patent Document 2 (Claim 1, paragraph 0014)). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-91054 [Patent Document 2] Japanese Patent Application Publication No. 10-192338 Summary of the Invention [Problem to be solved by the invention]

[0005] Disposable diapers such as those described in the cited documents 1 and 2 prevent back leakage by providing a rod-shaped barrier body or barrier means that protrudes toward the wearer's skin. However, such barrier bodies and barriers are bulky and cause discomfort to the wearer. Furthermore, the barrier bodies and barrier means are designed to be in constant contact with the wearer and are made of a relatively hard material, which may cause bedsores.

[0006] The present invention has been made in view of the above circumstances, and has as its object to provide a disposable diaper that can suppress back leakage and also suppress the occurrence of bedsores. [Means for solving the problem]

[0007] The disposable diaper of the present invention is a disposable diaper comprising a laminate including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, and having a front abdominal portion, a rear portion, and a narrow crotch portion connecting the front abdominal portion and the rear portion, and is characterized in that in the rear portion, an absorbent sheet different from the absorbent body is arranged in sheet form between the top sheet and the back sheet, and the absorbent sheet is arranged closer to the rear than the absorbent body.

[0008] The absorbent sheet has the function of absorbing and retaining bodily fluids and also has cushioning properties. By arranging such an absorbent sheet in sheet form, cushioning properties can be imparted to the area where it is placed, thereby preventing the occurrence of bedsores. Furthermore, by arranging the absorbent sheet behind the absorber, even if loose stool or the like is not absorbed by the absorber and moves behind the rear end of the absorber, the moisture from the loose stool or the like is absorbed by the absorbent sheet, thereby preventing back leakage. [Effects of the Invention]

[0009] The disposable diaper of the present invention can suppress back leakage and also suppress the occurrence of bedsores. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a plan view of an example of a disposable diaper of the present invention. [Figure 2] Schematic cross-sectional view of line AA in Figure 1. [Figure 3] Schematic cross-sectional view of line BB in Figure 1. [Figure 4] FIG. 2(a) is a plan view showing an example of an arrangement mode of a first adhesive, and FIG. 2(b) is a plan view showing an example of an arrangement mode of a second adhesive. [Figure 5] (a) Plan view showing another example of the arrangement of the first adhesive, (b) Plan view showing another example of the arrangement of the second adhesive, (c) Side view showing the stacking arrangement of the absorbent sheet, the first adhesive and the second adhesive. [Figure 6] FIG. 2 is a plan view of another example of a disposable diaper according to the present invention. [Figure 7] 7 is a schematic cross-sectional view taken along line AA in FIG. 6. [Figure 8] 7 is a schematic cross-sectional view taken along line BB in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0011] The disposable diaper of the present invention comprises a laminate including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, and has a front abdominal portion, a rear portion, and a narrow crotch portion connecting the front abdominal portion and the rear portion. The disposable diaper of the present invention is characterized in that an absorbent sheet different from the absorbent body is arranged in sheet form between the top sheet and the back sheet in the rear portion, and the absorbent sheet is arranged closer to the rear than the absorbent body.

[0012] Disposable diapers have a front-to-rear direction and a width direction. The front-to-rear direction refers to the direction extending from the front to the back of the wearer's crotch when the disposable diaper is worn by the wearer. The width direction refers to a direction on the same plane as the disposable diaper that is perpendicular to the front-to-rear direction, and corresponds to the left-to-right direction of the wearer when the absorbent article is worn. The direction perpendicular to the plane formed by the front-to-rear direction and the width direction is referred to as the thickness direction. Furthermore, when the disposable diaper is worn by a wearer, the side facing the wearer's skin is referred to as the skin-facing side, and the opposite side is referred to as the non-skin-facing side.

[0013] The disposable diaper of the present invention is composed of a front abdominal section, a rear section, and a crotch section located between the two sections and equipped with an absorbent. The front abdominal section corresponds to the section that contacts the wearer's abdomen when the disposable diaper is worn. The rear section corresponds to the section that contacts the wearer's back when the disposable diaper is worn. The crotch section is located between the front abdominal section and the rear section and corresponds to the section that contacts the wearer's crotch.

[0014] The disposable diaper may be a tape-type disposable diaper or a pants-type disposable diaper. Tape-type disposable diapers are configured, for example, with fastening members provided at both widthwise ends of the rear portion, and these fastening members are fastened to the front abdominal portion so that the diaper can be formed into a pants-like shape when worn. Pants-type disposable diapers have a pants-like shape with a waist opening and a pair of leg openings, and are formed into a pants-like shape before being worn.

[0015] The disposable diaper comprises a laminate including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet.

[0016] (Top sheet) The top sheet is usually placed closest to the wearer in the absorbent article and quickly captures the wearer's bodily fluids and transfers them to the absorbent body. The top sheet can be made of a liquid-permeable sheet material, such as a nonwoven fabric made of hydrophilic fibers. Examples of nonwoven fabrics used as the top sheet include point-bonded nonwoven fabrics, air-through nonwoven fabrics, spunlace nonwoven fabrics, and spunbonded nonwoven fabrics, and the hydrophilic fibers used to form these nonwoven fabrics are usually cellulose, rayon, cotton, etc. Alternatively, the top sheet can be made of a liquid-permeable nonwoven fabric made of hydrophobic fibers (e.g., polypropylene, polyethylene, polyester, polyamide) whose surfaces have been hydrophilized with a surfactant.

[0017] (back seat) The backsheet is positioned on the outermost side of the absorbent article and prevents leakage of body fluids and the like to the outside. Examples of liquid-impermeable sheets used for the backsheet include water-repellent or liquid-impermeable nonwoven fabrics (e.g., spunbond nonwoven fabrics, meltblown nonwoven fabrics, and SMS (spunbond-meltblown-spunbond) nonwoven fabrics) made of hydrophobic fibers (e.g., polypropylene, polyethylene, polyester, and polyamide) and water-repellent or liquid-impermeable plastic films. These sheets prevent body fluids that reach the liquid-impermeable sheet from seeping out of the absorbent article. When a plastic film is used for the liquid-impermeable sheet, a moisture-permeable (breathable) plastic film is preferred from the perspective of preventing stuffiness and improving wearer comfort. A paper sheet may also be placed between the plastic film and the absorbent body to further impart diffusion and shape stability.

[0018] (absorber) The absorbent absorbs and retains body fluids. The absorbent comprises at least one water-absorbing layer. The water-absorbing layer preferably contains a water-absorbent resin powder as a water-absorbent material. The water-absorbent resin powder may be any of those conventionally used in absorbent articles.

[0019] The water-absorbing layer preferably contains a fibrous base material. The inclusion of the fibrous base material improves the shape retention of the water-absorbing layer, and the fibrous base material ensures a path for body fluids, further improving the absorption rate. Examples of the fibrous base material include absorbent fibers and heat-fusible fibers. Examples of the absorbent fibers include pulp fibers, cellulose fibers, rayon, and acetate fibers. Examples of the heat-fusible fibers include polyolefin fibers such as polyethylene and polypropylene, polyester fibers, and composite fibers.

[0020] The absorbent body may be formed only from a water-absorbing layer, or may have a substrate. Examples of the substrate include a paper sheet such as tissue paper, a liquid-permeable nonwoven fabric sheet, etc. Examples of the absorbent body having a substrate include a form in which a water-absorbent material is fixed to the substrate, and a form in which a water-absorbent material is wrapped in the substrate and formed into a desired shape.

[0021] The absorbent body may be one layer or two or more layers. When the absorbent body is two or more layers, the water-absorbing layer of the absorbent body arranged closest to the skin side preferably has a through-hole extending in the front-rear direction at the center in the width direction.

[0022] The planar shapes of the water absorption layer and the absorbent body are not particularly limited, and examples thereof include a rectangular shape, an hourglass shape, a gourd shape, a battledore shape, etc. Furthermore, the absorbent body may have an adhesive layer for fixing the water absorbent resin powder in addition to the water absorption layer.

[0023] (absorbent sheet) In the rear portion of the disposable diaper, an absorbent sheet different from the absorbent body is disposed in a sheet form between the top sheet and the back sheet.

[0024] The absorbent sheet has the function of absorbing and retaining body fluids and also has cushioning properties. By arranging such an absorbent sheet in sheet form, cushioning properties can be imparted to the area where it is placed, thereby preventing the occurrence of bedsores. Note that "arranging in sheet form" means that the absorbent sheet is not rolled into a rod shape. The absorbent sheet may be multi-layered (two or more layers), but is preferably single-layered.

[0025] The thickness of the absorbent sheet is preferably 1.0 mm or more, more preferably 1.5 mm or more, and even more preferably 2.0 mm or more, and is preferably 7.0 mm or less, more preferably 6.0 mm or less, and even more preferably 5.0 mm or less. A thickness of 1.0 mm or more provides high cushioning properties and can more effectively prevent bedsores, while a thickness of 7.0 mm or less prevents the sheet from being too thick and causing discomfort to the wearer or unnecessary friction.

[0026] The basis weight of the absorbent sheet is 15 g / m 2 More preferably, 25 g / m 2 More preferably, 35 g / m 2 or more, 250 g / m 2 Preferably, it is 240 g / m or less, more preferably 240 g / m 2 or less, more preferably 230 g / m 2 The basis weight is 15 g / m or less. 2 If it is more than 250g / m, the resilience is high and cushioning is improved, and productivity is also high. 2 If the thickness is below this, the wearer will not feel uncomfortable and the cushioning properties will be better.

[0027] Examples of materials for the absorbent sheet include plastic foam (foam), three-dimensional knitted fabric, and porous material.

[0028] The plastic foam has a large number of pores. Furthermore, the large number of pores in the plastic foam are breathable. In the plastic foam, each pore has a through-hole to the surface of the plastic foam, or a through-hole between adjacent pores. The shape of each pore is not particularly limited. Furthermore, the plastic foam may have non-breathable pores. The plastic foam preferably has pores that are continuous in the planar direction. In other words, it is preferable that the large number of pores have through-holes between them and are breathable in the planar direction. Examples of the plastic foam include polyurethane foam.

[0029] Examples of the three-dimensional knitted fabric include a three-dimensional knitted fabric of resin fiber (for example, Fusion (registered trademark) manufactured by Asahi Kasei Fibers Corporation).

[0030] The absorbent sheet is preferably made of plastic foam, and particularly preferably made of polyurethane foam. The hardness of the polyurethane foam is preferably 30 N or more, more preferably 50 N or more, and is preferably 200 N or less, more preferably 150 N or less. The hardness of the polyurethane foam is measured in accordance with JIS K6400. The breathability of the polyurethane foam is preferably 10 L / min or more, more preferably 20 L / min or more, and is preferably 120 L / min or less, more preferably 100 L / min or less. If the breathability of the polyurethane foam is 10 L / min or more, stuffiness inside the absorbent article can be prevented. The breathability of the polyurethane foam is measured in accordance with ASTM D3574.

[0031] The absorbent sheet is positioned rearward of the absorbent body. By positioning the absorbent sheet rearward of the absorbent body, even if loose stool or the like is not absorbed by the absorbent body and moves rearward of the rear end of the absorbent body, the moisture in the loose stool or the like is absorbed by the absorbent sheet, thereby suppressing back leakage.

[0032] It is preferable that the front end of the absorbent sheet and the rear end of the absorbent body are spaced apart. If the front end of the absorbent sheet and the rear end of the absorbent body are spaced apart, a space is formed between the absorbent sheet and the absorbent body in the laminate of the top sheet and the back sheet. Therefore, even if loose stool or the like is not absorbed by the absorbent body and moves rearward from the rear end of the absorbent body, it will remain in this space, further suppressing back leakage. Furthermore, if the front end of the absorbent sheet and the rear end of the absorbent body are spaced apart, it is preferable that the top sheet and the back sheet are joined between the absorbent sheet and the absorbent body. With this configuration, loose stool or the like is more likely to be captured in the space between the absorbent sheet and the absorbent body.

[0033] The distance between the front end of the absorbent sheet and the rear end of the absorber is preferably 5 mm or more, more preferably 7 mm or more, and even more preferably 9 mm or more, and is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. If the distance is 5 mm or more, the space for retaining bodily waste is increased, thereby further suppressing leakage of bodily waste, and if the distance is 50 mm or less, interference between the absorbent sheet and other components is suppressed, ensuring a sufficient size of the absorbent sheet and preventing the product from becoming unnecessarily large.

[0034] (glue) An adhesive is preferably disposed between the absorbent sheet and the top sheet and / or between the absorbent sheet and the back sheet, and the adhesive is preferably disposed intermittently on the top sheet side and / or the back sheet side of the absorbent sheet.

[0035] The adhesive may be arranged in a single pattern or in a combination of multiple patterns. For example, a spiral adhesive and a strip adhesive may be arranged overlapping each other, or multiple strip adhesives of different thicknesses may be arranged overlapping each other. When adhesives are overlapped, the number of layers may be two or more. Methods for combining and arranging multiple patterns include applying adhesive in multiple patterns to the adhesive surface of one of the sheets to be bonded together, and then laminating the other sheet on top of this adhesive; applying adhesive in different patterns to the adhesive surfaces of each of the two sheets to be bonded together, and then bonding them together.

[0036] (First adhesive) In the present invention, the adhesive disposed between the absorbent sheet and the top sheet is referred to as the first adhesive. In other words, the first adhesive directly bonds the absorbent sheet and the top sheet. As will be described later, when the contractile force of the waist elastic members causes the absorbent sheet to deform into a semi-bowl shape with the skin-facing side facing inward, a large space is formed between the wearer and the portion of the back where the absorbent sheet is disposed. If the top sheet floats away from the skin-facing surface of the absorbent sheet at this time, there is a risk that the top sheet will cause this space to disappear. By disposing the first adhesive, it is possible to prevent the top sheet from floating away from the skin-facing surface of the absorbent sheet, and this space is more reliably formed.

[0037] The first adhesive may be disposed over the entire surface of the absorbent sheet facing the top sheet, or may be disposed intermittently on the surface of the absorbent sheet facing the top sheet, with the intermittent disposition being preferred.

[0038] Examples of modes in which the first adhesive is intermittently arranged include modes in which it is arranged continuously in the front-to-back direction of the disposable diaper and intermittently in the width direction; modes in which it is arranged continuously in the width direction of the disposable diaper and intermittently in the front-to-back direction; modes having portions that are continuous in the width direction of the disposable diaper and portions that are arranged intermittently in the width direction; modes in which it is arranged intermittently in the front-to-back and width directions of the disposable diaper; and modes in which it is arranged continuously in the front-to-back and width directions of the disposable diaper.

[0039] The area of ​​the first adhesive is preferably 50% or more, more preferably 55% or more, and even more preferably 60% or more of the total area of ​​the top sheet-side plane of the absorbent sheet, and is preferably 95% or less, more preferably 90% or less, and even more preferably 85% or less. If the area is 50% or more, the bond between the top sheet and absorbent sheet will be stronger, and peeling of the top sheet from the absorbent sheet will be more suppressed. Furthermore, if the area is 95% or less, the absorption rate of body fluids and the like into the absorbent sheet will be better.

[0040] The first adhesive may be arranged in a single pattern or in a combination of multiple patterns. For example, a spiral adhesive and a strip adhesive may be arranged overlapping each other, or multiple strip adhesives of different thicknesses may be arranged overlapping each other. When adhesives are overlapped, the number of layers may be two or more.

[0041] When multiple adhesives are arranged in layers as the first adhesive, it is preferable that the first adhesive has an area with one adhesive layer and an area with two or more adhesive layers. With this configuration, the bonding strength (mechanical strength) of the absorbent sheet is reinforced in the areas with two or more adhesive layers. The presence of intermittent areas of relatively high strength in the absorbent sheet makes it easier for the absorbent sheet to deform into a semi-bowl shape with the skin-facing side on the inside. It is preferable that the areas with two or more adhesive layers are arranged continuously over the entire length of the absorbent sheet in the front-to-back direction of the disposable diaper and intermittently in the width direction. With this arrangement, the absorbent sheet is easier to curve in the width direction, making it easier for the absorbent sheet to deform into a semi-bowl shape with the skin-facing side on the inside.

[0042] When the area of ​​the first adhesive is taken as 100%, the area ratio of the region with two or more layers of adhesive is preferably 3% or more, more preferably 5% or more, and preferably 20% or less, more preferably 15% or less. If the area ratio of the region with two or more layers of adhesive is 3% or more, the absorbent sheet is more likely to deform into a semi-bowl shape with the skin-facing side facing inward. Furthermore, if the area ratio of the region with two or more layers of adhesive is 20% or less, the cushioning properties of the absorbent sheet will be better.

[0043] The first adhesive is preferably arranged in a two-layer structure with an eleventh adhesive layer arranged on the top sheet side and a twelfth adhesive layer arranged on the absorbent sheet side. This configuration ensures adhesive strength between the top sheet and absorbent sheet, ensures flexibility of the absorbent sheet, and prevents liquid from returning from the absorbent sheet to the top sheet. The eleventh adhesive and the twelfth adhesive are preferably arranged intermittently on the top sheet-side flat surface of the absorbent sheet.

[0044] The eleventh adhesive is preferably arranged continuously in the front-to-rear direction of the disposable diaper and intermittently in the width direction, which allows the absorbent sheet to bend easily in the width direction and deform easily into a half-bowl shape with the skin-facing side facing inward.

[0045] The length of the eleventh adhesive in the front-to-rear direction is preferably 50% or more, more preferably 70% or more, even more preferably 90% or more, and most preferably 100%, of the length of the absorbent sheet in the front-to-rear direction taken as 100%. If the length of the first region in the front-to-rear direction is 50% or more, the adhesive strength between the top sheet and the absorbent sheet is further improved.

[0046] A preferred arrangement of the eleventh adhesive is a strip-shaped adhesive extending in the front-to-rear direction of the disposable diaper, spaced apart in the width direction. In this case, the width of the strip-shaped adhesive is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, more preferably 3.0 mm or less. The interval between adjacent strip-shaped adhesives is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, more preferably 3.0 mm or less.

[0047] The area of ​​the eleventh adhesive on the top sheet-side plane of the absorbent sheet is preferably 50% or more of the total area, more preferably 55% or more, even more preferably 60% or more, and is preferably 94% or less, more preferably 90% or less, even more preferably 85% or less. If the area is 50% or more, body fluids and the like absorbed into the absorbent sheet are further prevented from returning from the top sheet-side plane to the top sheet. Furthermore, if the area is 90% or less, the absorption rate of body fluids and the like into the absorbent sheet is improved.

[0048] The twelfth adhesive is preferably arranged continuously along the entire length of the absorbent sheet in the front-to-rear direction of the disposable diaper and intermittently in the width direction, which allows the absorbent sheet to bend easily in the width direction and deform easily into a half-bowl shape with the skin-facing side facing inward.

[0049] The preferred arrangement of the twelfth adhesive is a strip-shaped adhesive extending in the front-to-rear direction of the disposable diaper, spaced apart in the width direction. In this case, the width of the strip-shaped adhesive is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, more preferably 3.0 mm or less. The interval between adjacent strip-shaped adhesives is preferably 5.0 mm or more, and preferably 20.0 mm or less.

[0050] The area of ​​the twelfth adhesive on the top sheet side of the absorbent sheet is preferably 5% or more and 30% or less of the total area.

[0051] (Second adhesive) It is preferable that an adhesive be disposed between the absorbent sheet and the back sheet. In the present invention, the adhesive disposed between the absorbent sheet and the back sheet is referred to as a second adhesive. In other words, the second adhesive directly bonds the absorbent sheet and the back sheet. By disposing the second adhesive, the back sheet and the absorbent sheet deform together when worn, so that the absorbent sheet can be effectively maintained in a half-bowl shape.

[0052] The second adhesive may be disposed over the entire surface of the absorbent sheet facing the backsheet, or may be disposed intermittently on the surface of the absorbent sheet facing the backsheet, with the intermittent disposition being preferred.

[0053] Examples of modes in which the second adhesive is intermittently arranged include modes in which it is arranged continuously along the entire length of the absorbent sheet in the front-to-back direction of the disposable diaper and intermittently in the width direction; modes in which it is arranged continuously in the width direction of the disposable diaper and intermittently in the front-to-back direction; modes in which it has portions that are continuous in the width direction of the disposable diaper and portions that are arranged intermittently in the width direction; modes in which it is arranged intermittently in the front-to-back and width directions of the disposable diaper; and modes in which it is arranged continuously in the front-to-back and width directions of the disposable diaper.

[0054] The second adhesive is preferably arranged in a strip-like shape extending in the front-to-rear direction of the disposable diaper and spaced apart in the width direction. In this case, the width of the strip-like adhesive is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, more preferably 3.0 mm or less. The spacing between adjacent strip-like adhesives is preferably 5.0 mm or more, more preferably 10.0 mm or more, and preferably 40.0 mm or less, more preferably 30.0 mm or less.

[0055] The area of ​​the second adhesive on the backsheet-side plane of the absorbent sheet is preferably 3% or more, more preferably 4% or more, and even more preferably 5% or more of the total area of ​​the backsheet-side plane of the absorbent sheet, and is preferably 30% or less, more preferably 25% or less, and even more preferably 20% or less. If the area is 3% or more, peeling of the backsheet from the absorbent sheet is more effectively prevented, and if it is 30% or less, moisture permeability is improved.

[0056] The second adhesive may be arranged in a single pattern or in a combination of multiple patterns. For example, a spiral adhesive and a strip adhesive may be arranged overlapping each other, or multiple strip adhesives of different thicknesses may be arranged overlapping each other. When adhesives are overlapped, the number of layers may be two or more.

[0057] Specific examples of an arrangement in which the adhesive is arranged continuously in the front-to-back direction of the disposable diaper and intermittently in the width direction include an arrangement in which multiple strip-shaped adhesives extending in the front-to-back direction of the disposable diaper are arranged at intervals in the width direction; and an arrangement in which multiple spiral-shaped adhesives extending in the front-to-back direction of the disposable diaper are arranged at intervals in the width direction. Specific examples of an arrangement in which the adhesive is arranged continuously in the width direction of the disposable diaper and intermittently in the front-to-back direction include an arrangement in which multiple strip-shaped adhesives extending in the width direction of the disposable diaper are arranged at intervals in the front-to-back direction; and an arrangement in which multiple spiral-shaped adhesives extending in the width direction of the disposable diaper are arranged at intervals in the front-to-back direction. A specific example of an embodiment having a portion that is continuous in the width direction of the disposable diaper and a portion that is arranged intermittently in the width direction is an embodiment in which adhesive is arranged in the rear end region of the absorbent sheet so that it is continuous in the width direction of the disposable diaper, and in other portions, multiple strips of adhesive that extend in the front-to-rear direction of the disposable diaper are arranged at intervals in the width direction. A specific example of the adhesive being intermittently disposed in the front-rear and width directions of the disposable diaper is an adhesive having a certain shape in a plan view, which is scattered about.

[0058] In the combination of the first adhesive and the second adhesive, the ratio of the application area of ​​the first adhesive on the plane surface facing the top sheet of the absorbent sheet to the application area of ​​the second adhesive on the plane surface facing the back sheet (application area of ​​first adhesive / application area of ​​second adhesive) is preferably 5 or more, more preferably 6 or more, even more preferably 7 or more, and is preferably 20 or less, more preferably 19 or less, even more preferably 18 or less. If the ratio is 5 or more, the liquid retention power of the absorbent sheet will be better, and if it is 20 or less, the liquid permeability of the absorbent sheet will be better.

[0059] The area of ​​the first adhesive or second adhesive on the top sheet side or back sheet side of the absorbent sheet is not particularly limited and can be measured by known methods, such as a method of scattering a pigment, toner, or the like on the surface to be coated to color the adhesive and measuring the area of ​​the colored portion, or a method of calculating the coated area from the nozzle discharge amount and spray speed (pump rotation speed) when coating the adhesive, the diffusion range, etc.

[0060] (Elastic material for waist circumference) In the disposable diaper, it is preferable that waist elastic members are disposed between the topsheet and the backsheet near the front end of the front abdominal section and / or near the rear end of the rear section. The waist elastic members exert a contractile force in the width direction on the areas near the front end of the front abdominal section and / or near the rear end of the rear section where the waist elastic members are disposed. This allows the diaper to fit snugly around the waist of the wearer when worn.

[0061] The waist elastic members may be made of polyurethane rubber thread, polyurethane rubber film, natural rubber, etc. The waist elastic members are preferably fixed with an adhesive such as a hot melt adhesive, more preferably a rubber-based hot melt adhesive. The number of waist elastic members, their width, etc. may be adjusted as appropriate.

[0062] When waist elastic members are disposed between the top sheet and the back sheet in the rear region, it is preferable that the waist elastic members in the rear region be disposed on the rear rear side of the absorbent sheet. It is also preferable that the absorbent sheet and waist elastic members do not overlap in the thickness direction between the top sheet and the back sheet. By disposing them in this manner, the rear rear end of the absorbent sheet contracts more in the width direction than the front ventral front portion, causing the absorbent sheet to deform into a semi-bowl shape with the skin-facing side facing inward. This deformation of the absorbent sheet creates a large space between the portion of the rear region where the absorbent sheet is disposed and the wearer when worn. Therefore, even if loose stool or the like migrates toward the rear rear side of the rear end of the absorbent body without being absorbed, it will remain in this space, further suppressing back leakage.

[0063] (Elastic material for legs) The disposable diaper may further include leg elastic members extending in the front-to-rear direction between the top sheet and the back sheet near both widthwise ends of the crotch region. By fixing the leg elastic members to the top sheet and the back sheet, leg gathers can be formed by the contractile force of the leg elastic members. The leg elastic members are preferably arranged outward in the widthwise direction of the disposable diaper from both side edges of the absorbent core.

[0064] The leg elastic members may be made of polyurethane rubber thread, polyurethane rubber film, natural rubber, etc. The leg elastic members are preferably fixed with an adhesive such as a hot melt adhesive, more preferably a rubber-based hot melt adhesive. The number of leg elastic members, their length in the front-to-back direction, etc. may be adjusted as appropriate.

[0065] (Rising flap) Preferably, rise-up flaps are disposed on both sides of the disposable diaper on the skin-facing side of the top sheet. The rise-up flaps have a base portion that is the starting point of the rise and a free end that is the tip of the rise. The provision of the rise-up flaps can prevent side leakage of body fluids such as urine.

[0066] The rising flaps can be made of a flap-forming sheet, which can be made of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like, and can be made of a sheet material that can be used for a back sheet.

[0067] The flap-forming sheet may be formed by side sheets provided on both sides of the top sheet in the width direction. In this case, the side sheets are joined to the top sheet at side joining parts, and the parts of the side sheets that are inward in the width direction from the side joining parts can be used as flap-forming sheets.

[0068] It is preferable that a flap elastic member extending in the front-rear direction is arranged in a stretched state at the free end of the rising flap. The contractile force of the flap elastic member promotes the rising of the rising flap. It is preferable that the flap elastic member is arranged between the folded-back flap-forming sheet after the free end of the flap-forming sheet is folded back. That is, it is preferable that the flap elastic member is arranged between one side and the other side of the free end of the flap-forming sheet folded back at the free end. Furthermore, since the contractile force of the flap elastic member causes the disposable diaper to contract in the front-rear direction, the absorbent sheet also contracts in the front-rear direction, making it easier to maintain the absorbent sheet in a semi-bowl shape with the skin-facing side facing inward.

[0069] Furthermore, it is preferable that the base of the rising flap is positioned widthwise inward of the side edge of the absorbent body. By configuring it in this way, body fluids such as urine on the top sheet can be guided to the absorbent body, thereby preventing leakage.

[0070] When the rising flaps are provided, the widthwise ends of the absorbent sheet are preferably located widthwise inward of the bases of the rising flaps, which makes it easier to fold the disposable diaper widthwise.

[0071] The rear end of the rising flap is preferably fixed to the top sheet with a three-dimensional end adhesive. By fixing the rear end with a three-dimensional end adhesive in this manner, leakage of body fluids and the like from the rear end of the rising flap can be suppressed.

[0072] The length of each three-dimensional end adhesive in the front-rear direction is preferably 30 mm to 150 mm, and the width is preferably 20 mm to 70 mm.

[0073] In this case, it is preferable that the three-dimensional end adhesive is arranged so as to overlap the widthwise end of the absorbent sheet in the thickness direction. By arranging it in this manner, the contractile force of the flap elastic member acts on the absorbent sheet, causing the absorbent sheet to deform into a semi-bowl shape with the skin-facing side facing inward. Therefore, even if the second adhesive is peeled off (the absorbent sheet is peeled off from the back sheet), the absorbent sheet can maintain its semi-bowl shape with the skin-facing side facing inward. [Example]

[0074] The disposable diaper of the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments shown in the drawings.

[0075] (First aspect) 1 to 3 show an example of the configuration of a tape-type disposable diaper as a first embodiment of the disposable diaper of the present invention. FIG. 1 shows a plan view of the tape-type disposable diaper as seen from the skin-facing side. FIG. 2 shows an AA cross-sectional view of the absorbent article shown in FIG. 1. FIG. 3 shows a BB cross-sectional view of the absorbent article shown in FIG. 1. In the figures, arrow x is defined as the width direction, and arrow y as the front-to-rear direction. The direction on the plane formed by arrows x and y is defined as the planar direction. The direction perpendicular to the plane formed by arrows x and y represents the thickness direction z. In FIG. 3, the side sheets 8 are shown slightly raised to make it easier to understand the configuration of the rise-up flaps.

[0076] The disposable diaper 1 is made of a laminate having a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body 4 disposed therebetween. An adhesive 21 is disposed between the top sheet 2 and the absorbent body 4, and the top sheet 2 and the absorbent body 4 are fixed together by the adhesive 21. An adhesive 31 is disposed between the back sheet 3 and the absorbent body 4, and the back sheet 3 and the absorbent body 4 are fixed together by the adhesive 31. The arrangement of the adhesives 21 and 31 is not particularly limited, and they may be arranged so as to fix the top sheet 2 and the absorbent body 4, or the back sheet 3 and the absorbent body 4 together.

[0077] The laminate has a front abdominal portion P, a rear portion R, and a narrow crotch portion Q connecting the front abdominal portion P and the rear portion R. In the rear portion R, an absorbent sheet 5 different from the absorbent core 4 is disposed in sheet form between the top sheet 2 and the back sheet 3.

[0078] The absorbent sheet 5 has a single-layer structure and is uniformly configured overall. Such an absorbent sheet 5 is easy to process and is thin and light, so it does not cause discomfort to the user's skin. Furthermore, the absorbent sheet 5 is not rolled or folded, nor is it wrapped or sandwiched between other members. Therefore, the absorbent sheet 5 is easily deformed by the contraction forces of the waist elastic members and the flap elastic members, and is easily deformed into curved shapes (such as a semi-cylinder or a semi-bowl). Furthermore, the absorbent sheet 5 is flexible, so it can be easily bonded to a top sheet.

[0079] The absorbent sheet 5 is disposed rearward of the absorbent body 4 so that the front end of the absorbent sheet 5 is spaced apart from the rear end of the absorbent body 4. The distance D between the front end of the absorbent sheet 5 and the rear end of the absorbent body 4 is 10 mm to 50 mm. Although the front end of the absorbent sheet 5 and the rear end of the absorbent body 4 are spaced apart in Figs. 1 and 2, the front end of the absorbent sheet 5 and the rear end of the absorbent body 4 may be disposed so that at least a portion of the front end of the absorbent sheet 5 and the rear end of the absorbent body 4 are in contact with each other.

[0080] A first adhesive 51 is disposed between the absorbent sheet 5 and the top sheet 2. In other words, the absorbent sheet 5 and the top sheet 2 are directly bonded together by the first adhesive 51. The first adhesive 51 is disposed intermittently on the plane of the top sheet side of the absorbent sheet 5, and is disposed so as to be continuous over the entire length of the absorbent sheet in the front-to-rear direction of the disposable diaper and intermittently in the width direction.

[0081] A second adhesive 52 is disposed between the absorbent sheet 5 and the back sheet 3. In other words, the absorbent sheet 5 and the back sheet 3 are directly bonded together by the second adhesive 52. The second adhesive 52 is disposed intermittently on the plane of the top sheet side of the absorbent sheet 5, and is disposed so as to be continuous over the entire length of the absorbent sheet in the front-to-rear direction of the disposable diaper and intermittently in the width direction.

[0082] The arrangement of the first adhesive 51 and the second adhesive 52 will be described with reference to Fig. 4. Fig. 4(a) shows the arrangement of the first adhesive 51. Fig. 4(b) shows the arrangement of the second adhesive 52.

[0083] The first adhesive 51 is a plurality of strip-shaped adhesives extending across the entire length of the absorbent sheet in the front-rear direction, and arranged at intervals in the width direction. The first adhesive 51 is a combination of strip-shaped adhesives of different thicknesses. The width of each strip-shaped first adhesive 51 is 1 mm to 5 mm. The spacing between adjacent strip-shaped first adhesives 51 is 1 mm to 5 mm. The area of ​​the first adhesives 51 on the top sheet-side plane of the absorbent sheet 5 is 50% to 95% of the total area.

[0084] The second adhesive 52 is a plurality of strip-shaped adhesives extending across the entire length of the absorbent sheet in the front-rear direction, and arranged at intervals in the width direction. The width of each strip-shaped second adhesive 52 is 1 mm to 5 mm. The interval between adjacent strip-shaped second adhesives 52 is 5 mm to 40 mm. The area of ​​the second adhesive 52 on the backsheet-side plane of the absorbent sheet 5 is 3% to 30% of the total area.

[0085] Another example of the arrangement of the first adhesive 51 and the second adhesive 52 will be described with reference to Fig. 5. Fig. 5(a) shows the arrangement of the first adhesive 51. Fig. 5(b) shows the arrangement of the second adhesive 52. Fig. 5(c) shows the laminated state of the absorbent sheet 5, the first adhesive 51, and the second adhesive 52.

[0086] The first adhesive 51 has a two-layer structure consisting of an eleventh adhesive 511 arranged on the top sheet 2 side and a twelfth adhesive 512 arranged on the absorbent sheet 5 side. The eleventh adhesive 511 is a plurality of strip-shaped adhesives extending over the entire length of the absorbent sheet in the front-to-rear direction and arranged at intervals in the width direction. The width of each of the strip-shaped eleventh adhesives 511 is 1 mm to 3 mm. The interval between adjacent strip-shaped eleventh adhesives 511 is 1 mm to 2 mm. On the top sheet-side plane of the absorbent sheet 5, the area of ​​the eleventh adhesive 511 is 50% to 95% of the total area.

[0087] The twelfth adhesive 512 is a plurality of strip-shaped adhesives extending across the entire length of the absorbent sheet in the front-to-rear direction, and arranged at intervals in the width direction. The twelfth adhesive 512 is a combination of strip-shaped adhesives of different widths. The width of each strip-shaped twelfth adhesive 512 is 1 mm to 5 mm. The interval between adjacent strip-shaped twelfth adhesives 512 is 5 mm to 20 mm. On the top sheet side plane of the absorbent sheet 5, the area where the eleventh adhesive 511 is arranged is 50% of the total area, and the area where the twelfth adhesive 512 is arranged is 5% to 30% of the total area.

[0088] The second adhesive 52 is a plurality of strip-shaped adhesives extending across the entire length of the absorbent sheet in the front-rear direction, and arranged at intervals in the width direction. The width of each strip-shaped second adhesive 52 is 1 mm to 5 mm. The interval between adjacent strip-shaped second adhesives 52 is 5 mm to 40 mm. The area of ​​the second adhesive 52 on the backsheet-side plane of the absorbent sheet 5 is 3% to 30% of the total area.

[0089] The arrangement of the first adhesive 51 and the second adhesive 52 is not limited to that shown in Figures 4 and 5, and for example, the number of strips of the first adhesive 51 and the second adhesive 52 arranged in strip form and the width of each strip of adhesive may be changed as appropriate. Also, in Figure 5, the relationship between the eleventh adhesive and the twelfth adhesive is such that the arrangement area of ​​the eleventh adhesive 511 is larger than the arrangement area of ​​the twelfth adhesive 512, but the arrangement area of ​​the eleventh adhesive 511 may be smaller than the arrangement area of ​​the twelfth adhesive 512.

[0090] The disposable diaper 1 has waist elastic members 61, 62 extending in the width direction x arranged near the front end of the front abdominal region P and / or near the rear end of the rear back region R. The waist elastic members 61, 62 form waist gathers along the waist of the wearer, preventing leakage of urine and the like from the abdominal or back side. The waist elastic members 61, 62 are provided between the top sheet 2 and the back sheet 3, and between the side sheet 8 and the back sheet 3. Although FIG. 1 shows waist elastic members 61, 62 also provided between the side sheet 8 and the back sheet 3, these waist elastic members 61, 62 may be provided only between the top sheet 2 and the back sheet 3.

[0091] The waist elastic members 62 of the rear region R are disposed on the rear side of the absorbent sheet 5. Furthermore, the absorbent sheet 5 and the waist elastic members 62 do not overlap in the thickness direction between the top sheet 2 and the back sheet 3.

[0092] Leg elastic members 7 extending in the front-to-rear direction y are provided near both ends of the crotch region Q in the width direction x. The leg elastic members 7 form gathers around the wearer's legs, improving the fit around the legs and preventing leakage of urine, etc. The leg elastic members 7 are disposed between the side sheets 8 and the back sheet 3.

[0093] Side sheets 8 extending in the front-to-rear direction y are provided on both sides of the top sheet 2 in the width direction x. The side sheets 8 are joined to the top sheet 2, and the joined parts form rise bases 81. The side sheets 8 are provided with flap elastic members 82 inward in the width direction x from the rise bases 81. When the disposable diaper 1 is in use, the contractile force of the flap elastic members 82 causes the inner parts of the side sheets 8 to rise toward the wearer's skin, thereby forming rise flaps and preventing side leakage of urine, etc.

[0094] The widthwise ends of the absorbent sheet 5 are disposed inward in the widthwise direction from the bases 81 of the rising flaps.

[0095] The disposable diaper 1 is provided with a pair of fastening members 9 on both sides of the rear region R in the width direction x. The fastening members 9 are fixed to the top sheet 2 and the back sheet 3 with adhesive 91. The fastening members 9 are provided with fasteners (e.g., hook-and-loop fasteners or adhesives) 92. Meanwhile, fastening-receiving parts 93 are provided on the non-skin-facing side of the front abdominal region P of the disposable diaper 1. The disposable diaper 1 can be put on by placing it against the wearer's crotch and joining the fasteners 92 of the fastening members 9 to the fastening-receiving parts 93.

[0096] (Second aspect) Figures 6 to 8 show an example of the configuration of a tape-type disposable diaper as a second embodiment of the disposable diaper of the present invention. Figure 6 shows a plan view of the tape-type disposable diaper as seen from the skin-facing side. Figure 7 shows a cross-sectional view of the absorbent article shown in Figure 6 taken along line AA. Figure 8 shows a cross-sectional view of the absorbent article shown in Figure 6 taken along line BB. In the figures, arrow x is defined as the width direction, and arrow y as the front-rear direction. The direction on the plane formed by arrows x and y is defined as the planar direction. The direction perpendicular to the plane formed by arrows x and y represents the thickness direction z.

[0097] In the disposable diaper shown in Figures 6 to 8, the rear edge 83 of the side sheet 8 is fixed to the top sheet 2 with a three-dimensional end adhesive 84. The three-dimensional end adhesive 84 is arranged so as to overlap the widthwise edge of the absorbent sheet 5 in the thickness direction.

[0098] Since the other components are the same as those of the first embodiment except for the provision of the three-dimensional end adhesive 84, a description of the other components will be omitted. [Explanation of symbols]

[0099] 1: disposable diaper, P: front abdomen, R: back portion, Q: crotch portion, 2: top sheet, 3: back sheet, 4: absorbent body, 5: absorbent sheet, 61, 62: waist elastic member, 7: leg elastic member, 8: side sheet, 9: fastening member

Claims

1. The insulated diaper comprises a laminate including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, A disposable diaper having a front portion, a rear portion, and a narrow crotch portion connecting the front portion and the rear portion, an absorbent sheet different from the absorbent body is disposed in a sheet form between the top sheet and the back sheet in the rear portion; The absorbent sheet is disposed on the rear side of the absorbent body, an adhesive is disposed between the absorbent sheet and the top sheet and / or between the absorbent sheet and the back sheet; The disposable diaper is characterized in that the adhesive is intermittently disposed on the top sheet side plane and / or the back sheet side plane of the absorbent sheet.

2. a first adhesive disposed between the absorbent sheet and the top sheet; a second adhesive disposed between the absorbent sheet and the backsheet; 2. The disposable diaper according to claim 1, wherein the ratio of the application area of ​​the first adhesive on the top sheet side plane of the absorbent sheet to the application area of ​​the second adhesive on the back sheet side plane (application area of ​​the first adhesive / application area of ​​the second adhesive) is 5 to 20.

3. A laminate comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, A disposable diaper having a front portion, a rear portion, and a narrow crotch portion connecting the front portion and the rear portion, an absorbent sheet different from the absorbent body is disposed in a sheet form between the top sheet and the back sheet in the rear portion; The absorbent sheet is disposed on the rear side of the absorbent body, a first adhesive disposed between the absorbent sheet and the top sheet; a second adhesive disposed between the absorbent sheet and the backsheet; A disposable diaper characterized in that the ratio of the application area of ​​the first adhesive on the top sheet side plane of the absorbent sheet to the application area of ​​the second adhesive on the back sheet side plane (application area of ​​the first adhesive / application area of ​​the second adhesive) is 5 to 20.

4. The disposable diaper according to any one of claims 1 to 3, wherein the first adhesive is disposed on at least 50% of the total area of ​​the top sheet-side plane of the absorbent sheet.

5. A laminate comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, A disposable diaper having a front portion, a rear portion, and a narrow crotch portion connecting the front portion and the rear portion, an absorbent sheet different from the absorbent body is disposed in a sheet form between the top sheet and the back sheet in the rear portion; The absorbent sheet is disposed on the rear side of the absorbent body, A disposable diaper characterized in that a first adhesive is disposed on at least 50% of the total area of ​​the top sheet side plane of the absorbent sheet.

6. The front end of the absorbent sheet and the rear end of the absorbent body are spaced apart from each other, 6. The disposable diaper according to claim 1, wherein the distance between the front edge of the absorbent sheet and the rear edge of the absorbent body is 5 mm or more.

7. a first adhesive disposed between the absorbent sheet and the top sheet; a second adhesive disposed between the absorbent sheet and the backsheet; The disposable diaper according to any one of claims 1 to 6, wherein the first adhesive and the second adhesive are arranged continuously in the front-to-rear direction of the disposable diaper and intermittently in the width direction.

8. The absorbent sheet has a thickness of 1.0 mm to 7.0 mm and a basis weight of 15 g / m 2 ~250g / m 2 The disposable diaper according to any one of claims 1 to 7, wherein the plastic foam is a plastic foam of the formula (I).

9. In the rear portion, a waist elastic member is disposed between the top sheet and the back sheet, The disposable diaper according to any one of claims 1 to 8, wherein the waist elastic member in the rear portion is disposed on the rear side of the absorbent sheet.

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