JP6342765B2 - Disposable paper diapers - Google Patents

Description

  The present invention relates to a disposable paper diaper in which an absorbent body is surrounded by an encapsulating sheet and a gathered nonwoven fabric for forming a three-dimensional gather standing on the skin side along the longitudinal direction on both sides of the skin side.

  Conventionally, for example, a pants-type disposable paper diaper 50 as shown in FIGS. 10 and 11 is known. The disposable paper diaper 50 has an absorbent body 54 interposed between a liquid-permeable top sheet 52 and a waterproof film 53 made of polyethylene or the like, and stands on the skin side along the longitudinal direction on both sides of the skin side. Comprising an absorbent main body 51 provided with a gathered nonwoven fabric 56 for forming a three-dimensional gathered BS, and an exterior sheet 57 integrally provided on the outer surface side of the absorbent main body 51. The front body and the back body of the seat 57 are joined to each other at the joint ends on both side ends thereof to form a waist opening WO and a pair of left and right leg openings LO, LO (FIG. 1). reference).

  The absorbent body 54 is surrounded by an encapsulating sheet 55 made of crepe paper or non-woven fabric to maintain the shape and improve the diffusibility of body fluid that has passed through the liquid-permeable top sheet 52. In order to surround the absorbent body 54 with the encapsulating sheet 55, as shown in FIG. 12, an encapsulating sheet 55 wider than the absorbent body 54 is prepared, and the absorbent body 54 is disposed at the center of the encapsulating sheet 55. The both sides of the encapsulating sheet 55 extending outward are folded back to the skin surface side so that the side edges of the absorber 54 are wound around, and the enveloping sheet 55 is placed on the skin surface side of the absorber 54. In general, an overlap portion 58 is formed in which the end portions overlap each other, and the overlap portion 58 is joined by a joining means such as a hot-melt adhesive to surround the absorbent body 54 in a frame shape. .

  On the other hand, in the following Patent Document 1, a bodily fluid absorbing element comprising a bodily fluid absorber and a covering sheet of the bodily fluid absorber, wherein the covering sheet includes a covering sheet and a back surface provided on the front side of the bodily fluid absorber. The covering sheet provided to the outer periphery of the body fluid absorber is joined to the outer periphery of the body fluid absorber, or joined to the outer periphery of the body fluid, and the joining portion is folded outward and joined to the back surface of the back surface side covering sheet. A body fluid absorbing element is disclosed.

JP 2007-202596 A

  However, in the conventional disposable paper diaper 50 shown in FIGS. 10 and 11, the ends of the encapsulating sheet 55 overlapped at the center of the absorbent body 54 on the skin surface side are joined together by a joining means such as a hot melt adhesive. Therefore, there is a drawback that the liquid permeability of this portion is lower than that of other portions.

  In addition, the encapsulating sheet surrounding the absorbent body is made of a material that has a high strength to prevent tearing due to twisting and friction on the non-skin side, and the skin side is soft and highly liquid-permeable. Is preferred. However, in the conventional disposable paper diaper 50, since the skin side and the non-skin side of the absorbent body are covered with one sheet, the performance suitable for each of the skin surface and the non-skin surface could not be satisfied. .

  Furthermore, the absorbent pulp and polymer may spill out from the gap between the overlapped end portions, and in this case, the feeling of roughness such as roughness may be impaired by the hard polymer.

  On the other hand, in the bodily fluid absorbing element described in Patent Document 1, since the covering sheet composed of the covering sheet on the front surface side and the covering sheet on the back surface side is joined outside the peripheral edge of the bodily fluid absorber, the skin surface side of the absorbing body However, the body fluid absorbing element described in Patent Document 1 is a so-called tape-type paper diaper, and the pants-type paper diaper has a different manufacturing procedure. The process may become complicated. That is, in a pants-type diaper provided with a gathered nonwoven fabric that forms a three-dimensional gather that stands on the skin side along the longitudinal direction on both sides on the skin side, a portion extending outside the absorbent body of the encapsulating sheet, Two steps are required: a step of folding back to the non-skin side, and a step of folding back the non-skin side of the gathered non-woven fabric so that the portion extending outside the absorbent body is wrapped around the side edge of the absorber. The joining process also required two processes.

  Therefore, the main problem of the present invention is that the encapsulating sheet has a performance suitable for each of the skin surface and the non-skin surface of the absorbent body while preventing a decrease in the absorbent performance of the absorbent body due to the placement of the encapsulating sheet. An object of the present invention is to provide a disposable paper diaper that can be used, can prevent a feeling of touching, and can simplify the manufacturing process.

In order to solve the above problems, the present invention according to claim 1 includes at least an absorbent body and an encapsulating sheet that encapsulates the absorbent body, and a three-dimensional gather that stands on the skin side on both sides of the skin surface side. In a disposable paper diaper comprising an absorbent main body provided with a gathered nonwoven fabric to be formed and an exterior sheet integrally provided on the outer surface side of the absorbent main body,
The encapsulating sheet comprises a skin-side encapsulating sheet provided on the skin side of the absorber and a non-skin-side encapsulating sheet provided on the non-skin side of the absorber, and the skin-side encapsulating sheet And the periphery of the non-skin-side encapsulating sheet is formed with a joined portion in which the skin-side encapsulating sheet and the non-skin-side encapsulating sheet are joined without the absorber.
The gathered nonwoven fabric is disposed on both sides of the absorbent body on the skin surface side, and the portions of the gathered nonwoven fabric that extend outward in the width direction from the absorbent body are defined as the skin-side encapsulation sheet and the non-skin-side encapsulation. The width direction outer edge of the gathered nonwoven fabric is wider than the width direction outer edge of the encapsulating sheet in a state where the side edge portion of the absorber is wound together with the portion of the sheet where the absorber is not interposed and folded back to the non-skin side. While extending to the center side, the gathered nonwoven fabric is joined to the outer surface side of the skin-side encapsulating sheet and the non-skin-side encapsulating sheet across the width direction outer edge of the encapsulating sheet ,
The encapsulation is performed so that no space is provided between the side edge of the absorber and the encapsulation sheet and between the encapsulation sheet and the gathered nonwoven fabric at the side edge of the absorber. A disposable paper diaper is provided, wherein the sheet and the gathered nonwoven fabric are arranged so as to be in close contact with the side edge side of the absorber .

  In the invention of claim 1, the skin-side encapsulating sheet and the non-skin-side encapsulating sheet are disposed as the encapsulating sheet on the skin side and the non-skin side of the absorber, respectively. The non-skin side encapsulating sheet has a structure joined at the peripheral edge where no absorber is interposed. For this reason, an overlap portion where the end portions of the encapsulating sheet are overlapped with each other and a joint portion by a hot melt adhesive or the like are not formed on the skin surface of the absorbent body. It can prevent that the absorption performance of the absorber by arrange | positioning a wrapping sheet falls.

  In addition, since the skin surface and the non-skin surface of the absorbent body are respectively covered by separate skin-side encapsulating sheet and non-skin-side encapsulating sheet, different materials as the skin-side encapsulating sheet and the non-skin-side encapsulating sheet Can be used, and an encapsulating sheet having a performance suitable for each of the skin surface and the non-skin surface of the absorber can be used, so that the absorption performance can be improved and the material cost can be reduced.

  Furthermore, the gathered nonwoven fabric has a width-wise outer edge of the gathered nonwoven fabric that is wider than the outer edge of the enveloped sheet in a state where a portion extending outward in the widthwise direction from the absorber is folded back to the non-skin side of the absorber together with the enveloped sheet. Since the gathered nonwoven fabric is joined to the outer surface side of the skin-side encapsulating sheet and the non-skin-side encapsulating sheet, extending across the width direction outer edge of the encapsulating sheet, while extending to the center side in the width direction, Even if there is spillage of pulp or polymer constituting the absorber from the joint between the skin-side encapsulation sheet and the non-skin-side encapsulation sheet, the gathered nonwoven fabric straddles the widthwise outer edge of the encapsulation sheet in the width direction. It is possible to prevent spilling out to the outside of the diaper by the joined portion joined together, and to prevent the feeling of roughness such as rough feeling due to the hard polymer from being lowered.

  On the other hand, in the production of the disposable paper diaper, the gathered nonwoven fabric is disposed on both sides of the absorbent body on the skin surface side, and the portion of the gathered nonwoven fabric that extends outward in the width direction from the absorbent body is defined as the skin. Since the side encapsulating sheet and the non-skin side encapsulating sheet are folded back to the non-skin side together with the part where the absorber does not intervene, the folding of the encapsulating sheet and the gathered nonwoven fabric The folding process is completed in one process, and the process for joining the encapsulating sheet and the gathered nonwoven fabric is completed in one process, and the manufacturing process can be simplified.

  As the present invention according to claim 2, there is provided the disposable paper diaper according to claim 1, wherein the skin-side enveloping sheet is made of a nonwoven fabric, and the non-skin-side enveloping sheet is made of crepe paper.

  In the invention according to the second aspect, a non-woven fabric made of a soft material is disposed on the skin side of the absorbent body. A crepe paper having a relatively high rigidity is disposed in order to prevent leakage due to the above.

  The disposable paper diaper according to claim 1, wherein the non-skin-side encapsulating sheet uses a material having a lower hydrophilicity than the skin-side encapsulating sheet.

  The invention described in claim 3 is suitable when an indicator showing a color reaction by contact with a body fluid is disposed on the non-skin side of the absorber. That is, if a highly hydrophilic material is used as the encapsulating sheet that covers the non-skin side of the absorber, the moisture of the absorber that has absorbed the humidity of the outside air can easily propagate to the indicator through the non-skin-side encapsulating sheet. Since the problem that the indicator is discolored easily occurs, a material having a relatively low hydrophilicity is used for the non-skin-side encapsulating sheet.

  As the present invention according to claim 4, there is provided the disposable paper diaper according to claim 1, wherein the non-skin side encapsulating sheet is made of a waterproof film, and the non-skin side of the absorbent body is not provided with a separate waterproof sheet. .

  In the invention of claim 4, the non-skin-side encapsulating sheet is formed of a waterproof film, and a separate waterproof sheet is not provided on the non-skin side of the absorber, whereby the number of materials used can be reduced. Cost can be reduced.

  As the present invention according to claim 5, there is provided the disposable paper diaper according to claim 1, wherein each of the skin-side enveloping sheet and the non-skin-side encapsulating sheet is composed of nonwoven fabrics having different fiber densities.

  In the invention according to claim 5, the absorption efficiency of body fluid is improved by capillary action due to the difference in fiber density, by configuring the skin-side encapsulation sheet and the non-skin-side encapsulation sheet with nonwoven fabrics having different fiber densities. To be able to. For example, when the fiber density of the non-skin-side encapsulating sheet is set higher than that of the skin-side encapsulating sheet, in the part where both sides of the encapsulating sheet are folded back to the non-skin side of the absorbent body, the density decreases in order from the non-skin side. A laminated structure of the skin-side encapsulating sheet and the two-layer high-density non-skin-side encapsulating sheet is formed by folding. For this reason, the enveloping sheet laminated | stacked on the both sides of the non-skin side of an absorber becomes a structure where a bodily fluid tends to transfer from an outer surface side to an absorber side by the capillary phenomenon by the density difference of a fiber.

  As this invention which concerns on Claim 6, the part by which the both sides of the said non-skin side enveloping sheet were turned back to the non-skin side is not joined to the outer surface side of the said non-skin side encapsulating sheet. A disposable paper diaper according to any of the above is provided.

  In the invention described in claim 6, the portions where both side portions of the non-skin-side encapsulating sheet are folded back to the non-skin side are not joined to the outer surface side of the non-skin-side encapsulating sheet, thereby forming a joining portion. When the fitting cut shape that both sides of the crotch part is depressed as the planar shape of the absorber is adopted, the encapsulating sheet can be used at the portion where the absorber does not intervene. It becomes possible to prevent hardening by bonding.

  As described above in detail, according to the present invention, it is possible to prevent a decrease in the absorption performance of the absorbent body due to the placement of the encapsulating sheet, and to have a performance suitable for each of the skin surface and the non-skin surface of the absorbent body A sheet can be used, a reduction in the feeling of touch can be prevented, and the manufacturing process of the diaper can be simplified.

It is a perspective view of the product state of the disposable paper diaper 1 which concerns on this invention. It is a partially broken expanded view of the disposable paper diaper. It is the III-III arrow directional view of FIG. (A), (B) is sectional drawing which shows the manufacture point of the disposable paper diaper 1. FIG. It is sectional drawing of the disposable paper diaper 1 which concerns on the other example of a form. It is sectional drawing of the disposable paper diaper 1 which concerns on the other example of a form. It is sectional drawing of the disposable paper diaper 1 which concerns on the other example of a form. It is sectional drawing of the disposable paper diaper 1 which concerns on the other example of a form. It is sectional drawing of the disposable paper diaper 1 which concerns on the other example of a form. It is a perspective view which shows the assembly point of the conventional disposable paper diaper 50. It is sectional drawing of the width direction of the conventional disposable paper diaper 50. FIG. FIG. 6 is a perspective view showing a procedure for enclosing the absorber 54 with an encapsulating sheet 55.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 3, the disposable paper diaper 1 (hereinafter also simply referred to as a diaper) is provided between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a waterproof sheet 12 made of polyethylene or the like. An absorbent body 13 such as cotton-like pulp encapsulated by an encapsulating sheet 14 made of nonwoven fabric or crepe paper is interposed, and three-dimensional gathers BS and BS standing on the skin side are formed on both sides of the skin surface side. The absorbent main body 10 provided with the gathered nonwoven fabric 15 and the exterior sheet 30 provided integrally on the outer surface side of the absorbent main body 10, in the product state shown in FIG. The front body F and the back body B of the exterior sheet 30 are overlapped with each other and joined at the joining edge portions 31 and 32 on both side ends, whereby a waist opening WO and a pair of left and right legs Mouth LO, a pants-type diaper of the LO is formed structure.

  Hereinafter, the structure of the disposable paper diaper 1 will be described in detail.

(Structure of the absorbent main body 10)
The structure of the absorbent main body 10 will be described in detail with reference to FIG.
As described above, the absorbent main body 10 is made of cotton-like pulp or the like encapsulated by the encapsulating sheet 14 between the liquid-permeable top sheet 11 made of nonwoven fabric or the like and the waterproof sheet 12 made of polyethylene or the like. The absorbent body 13 is interposed, and the gathered nonwoven fabric 15 for forming the three-dimensional gather BS standing on the skin side is disposed on both sides of the skin side, and absorbs and retains body fluids.

  In the illustrated example, the absorbent body 13 is formed with a substantially square shape in plan view, and the width dimension thereof is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion. The absorbent body 13 is encapsulated by an encapsulating sheet 14 in order to maintain the shape and improve the diffusibility of body fluid that has passed through the liquid-permeable top sheet 11.

The absorbent body 13 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used.

  The absorbent body 13 preferably includes superabsorbent polymer particles. In particular, at least in the liquid receiving region, the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of fibers. What is done is desirable.

  When there is no SAP particle in the upper part, the lower part, and the intermediate part of the absorber 13, or there is very little, it cannot be said that it is "dispersed in the whole thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Also excluded are forms in which some SAP particles do not penetrate into the fiber assembly and remain on the surface, and some SAP particles pass through the fiber assembly and are on the encapsulating sheet 14. Is not to be done.

  The superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles, those having a particle size used for this type of absorbent article can be used as they are. The average particle size is 1000 μm or less, and preferably 99 μm or more when not absorbed. It is desirable that the weight is not less than 99% by weight, in particular, 150 to 850 μm. The average particle size at the time of non-absorption is preferably about 250 to 500 μm. In addition, it is desirable that the superabsorbent polymer particles have an average particle size after absorption of 3 times or more, more specifically 500 μm or more than the average particle size when not absorbed. The average particle size of the superabsorbent polymer particles when not absorbed means the particle size at an integrated value of 50% in the weight-based particle size distribution. The weight-based particle size distribution in this case is measured according to JISZ8815-1994. That is, 710 μm, 500 μm, 300 μm, 150 μm, and 106 μm aperture sieves having an inner diameter of 150 mm and a depth of 45 mm are stacked with the narrow aperture sieve on the top, and the top 710 μm sieve having the widest aperture. 50 g of the measurement sample is put in, sieved with a sieve vibrator for 10 minutes, the weight of the measurement sample remaining on each sieve is measured, and the measurement sample remaining on each sieve based on the weight of the first measurement sample is measured. Measured by determining weight percent.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the so-called reversal of the liquid supplied into the absorbent body is likely to occur out of the absorbent body.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 13. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. If it exceeds 350 g / m ² , not only the effect is saturated, but also the sensation of incongruity due to the excess of the superabsorbent polymer particles is given.

  As the liquid-permeable top sheet 11 covering the skin surface side (surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and having high compression recovery properties. When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 may cover only the skin surface side of the absorbent body 13, or the side edge of the absorbent body 13 may be rolled up to the non-skin surface side (waterproof sheet 12 side) of the absorbent body 13. You may arrange so that it may exist.

  An intermediate sheet is provided between the liquid-permeable top sheet 11 and the encapsulating sheet 14 covering the skin side surface of the absorbent body 13 in order to move excrement that has passed through the liquid-permeable top sheet 11 to the absorbent body 13 and prevent reversal. (A second sheet is also referred to. Not shown) can be provided. This intermediate sheet not only rapidly transfers the excrement to the absorbent body 13 to improve the absorption performance by the absorbent body 13, but also prevents the excretion of the absorbed excrement from returning from the absorbent body 13, and the liquid-permeable top sheet 11. It is intended to improve the feel of the surface. This intermediate sheet can be omitted.

  As the intermediate sheet, the same material as the liquid-permeable top sheet 11 can be used. The intermediate sheet is preferably bonded to the liquid-permeable top sheet 11. When heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet has the same melting point as the liquid-permeable top sheet 11. Is preferred. Moreover, if considering the permeation of the solid content in the stool, the fineness of the fiber used for the intermediate sheet is preferably 5.0 to 7.0 dtex, but the liquid residue in the liquid-permeable top sheet 11 increases. . On the other hand, when the fineness of the fiber used for the intermediate sheet is 1.0 to 2.0 dtex, liquid residue of the liquid-permeable top sheet 11 is hardly generated, but the solid content of feces is difficult to permeate. Therefore, it is preferable that the fiber of the nonwoven fabric used for the intermediate sheet has a fineness of about 2.0 to 5.0 dtex.

  As the waterproof sheet 12 covering the non-skin surface side (back surface side) of the absorbent body 13, a liquid-impervious plastic sheet such as polyethylene or polypropylene is used, but in recent years, a sheet having moisture permeability is preferable from the viewpoint of preventing stuffiness. Used for. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  The encapsulating sheet 14 encapsulating the absorber 13 includes a skin-side encapsulating sheet 16 provided on the skin side of the absorber 13 and a non-skin-side encapsulating sheet 17 provided on the non-skin side of the absorber 13. It is comprised by the sheet material of 2 sheets which consists of these. The skin-side encapsulating sheet 16 mainly covers the skin side of the absorbent body 13, but the non-skin is formed such that a part extending outward from the absorbent body 13 is wrapped around the side edge of the absorbent body 13. By folding back to the side, the folded portion can cover a part of the non-skin side of the absorbent body 13.

  The skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 are portions where the skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 are overlapped at the periphery without the absorber 13 being interposed. 2 are joined at a peripheral joint 18 made of a joining means such as a hot melt adhesive or heat seal. That is, as shown in FIG. 4 (A), the skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 are each formed in a size extending outward from the peripheral edge of the absorbent body 13, A skin-side encapsulating sheet 16 and a non-skin-side encapsulating sheet 17 that extend outward from the periphery of the absorbent body 13 are directly joined at the periphery joining portion 18. The peripheral joint 18 is preferably provided in a pattern that is continuous along the circumferential direction of the encapsulating sheet 14 so that the pulp and polymer of the absorber 13 to be included do not spill out.

  In the present disposable paper diaper 1, separate skin-side encapsulating sheets 16 and non-skin-side encapsulating sheets 17 are disposed on the skin side and non-skin side of the absorbent body 13, respectively. Since there is no overlap portion where the end portions of the encapsulating sheet are overlapped with each other on the skin side surface of the absorbent body or a joint portion where these are joined, the encapsulating sheet does not cause a decrease in liquid permeability and absorbs It can prevent that the absorption performance of the body 13 falls.

  Moreover, since the skin surface and non-skin surface of the absorber 13 are each covered with a separate encapsulating sheet, the skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 are made of different materials. Therefore, it becomes possible to use an encapsulating sheet having a performance suitable for each of the skin surface and the non-skin surface of the absorbent body 13, thereby improving the absorption performance and reducing the material cost. Specific examples will be described later.

  On the other hand, the gathered non-woven fabric 15 forming the three-dimensional gather BS is disposed separately on both sides of the absorbent body 13 on the skin surface side, and the outer edge in the width direction is outside the outer edge in the width direction of the absorbent body 13. Extends towards.

  The gathered non-woven fabric 15 is a non-woven fabric made into a double sheet by folding, and is wound around the side edge of the absorbent body 13 and extends to the back surface side of the absorbent body 13. Inside the gathered nonwoven fabric 15 formed of the double sheet nonwoven fabric, one or a plurality of thread-like elastic members (not shown) spaced at appropriate intervals in the standing direction are disposed at the standing tip portion. . As shown in FIG. 3, the thread-like elastic member is for forming a three-dimensional gather BS by erecting the inner side portion of the gathered nonwoven fabric 15 by elastic stretching force.

  In the same manner as the liquid-permeable top sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is made of synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, regenerated fibers such as rayon or cupra, Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Further, with respect to the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging and to improve the feel to the skin (dry feeling), a silicon-based, paraffin-metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

  When manufacturing the said absorptive main body 10, as shown to FIG. 4 (A), the skin side enveloping sheet 16 and the non-skin side enveloping sheet are respectively shown in the skin surface side and the non-skin surface side of the absorber 13. After laminating 17 and joining the skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 at the peripheral edge joining portion 18, the absorber 13 is encapsulated with the encapsulating sheet 14, and then While the liquid-permeable top sheet 11 is laminated | stacked on the skin surface side, the gathered nonwoven fabric 15 is arrange | positioned at the both sides of the skin surface side, respectively.

  Thereafter, the part of the gathered nonwoven fabric 15 that extends outward in the width direction from the absorbent body 13 together with the part of the skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 where the absorbent body 13 is not interposed. The side edge portion is folded back to the non-skin side, and the folded portion is joined to the outer surface side of the encapsulating sheet 14 at a predetermined portion (FIG. 4B). Then, the absorbent main body 10 is completed by joining the waterproof sheet 12 to the non-skin surface side.

  Here, as shown in FIG. 4 (B), the gathered nonwoven fabric 15 is such that the outer edge in the width direction of the gathered nonwoven fabric 15 is the encapsulated sheet with the side edge portion folded back to the non-skin side of the absorbent body 13. 14, the gathered nonwoven fabric 15 extends across the width direction outer edge of the encapsulating sheet 14 in the width direction, and extends to the width direction center side from the width direction outer edge of the skin side encapsulating sheet 16 and the non-skin side. It is joined to the outer surface side of the encapsulating sheet 17, respectively. That is, on the non-skin surface side of the absorbent body 13, the gathered nonwoven fabric 15 is disposed so as to completely cover the portion folded back to the non-skin side of the encapsulating sheet 14, and the gathered nonwoven fabric 15 folded back to the non-skin surface side Similarly, it is joined to the encapsulating sheet 14 at a gathered non-woven fabric joint portion 19 that straddles the encapsulating sheet 14 that is folded back to the non-skin surface side and the non-skin-side encapsulating sheet 17 that covers the non-skin surface side of the absorbent body 13. For this reason, the pulp and polymer of the absorber 13 are doubly sealed by the peripheral joint 18 and the gathered nonwoven joint 19, and even if pulp or polymer spills from the peripheral joint 18, the peripheral Since the gathered nonwoven fabric joint portion 19 is further arranged outside the joint portion 18, it is possible to prevent the polymer and the like from spilling to the outside, and to prevent the feeling of roughness such as a rough feeling due to the hard polymer from being lowered. Become.

  As shown in FIG. 3, the gathered nonwoven fabric 15 is continuously or spaced over almost the entire length in the longitudinal direction at the end in the width direction with the side edge folded back to the non-skin side of the absorbent body 13. In the gathered nonwoven fabric joint portion 19 composed of joint means such as hot melt adhesive or heat seal provided discretely, the skin side envelope sheet 16 and the skin side envelope sheet 16 extending across the width direction outer edge of the envelope sheet 14 and The non-skin-side encapsulating sheet 17 is joined to the outer surface side.

  As shown in the illustrated example, the gathered nonwoven fabric bonding portion 19 has an outer surface of the non-skin-side encapsulating sheet 17 from the position of the outer surface of the skin-side encapsulating sheet 16 folded back to the non-skin side toward the center side in the diaper width direction. It can form in the range over the position. That is, the end portion of the encapsulating sheet 14 folded back to the non-skin side can be formed in a range straddling the width direction. Thereby, the gathered nonwoven fabric joint part 19 comes to be further formed outside the peripheral joint part 18 between the skin side encapsulating sheet 16 and the non-skin side encapsulating sheet 17, and the mouth opening of the peripheral joint part 18 is completely completed. This can prevent the spillage of the polymer from the peripheral joint 18 more reliably.

  As shown in FIG. 3, the skin-side encapsulating sheet 16 in which the widthwise end of the gathered nonwoven fabric 15 is folded back to the non-skin side with the side edge of the gathered nonwoven fabric 15 folded back to the non-skin side of the absorbent body 13. And length S extended to the diaper width direction center side from the width direction edge part of the non-skin side enveloping sheet 17 is 3 mm-20 mm, Preferably it is 5 mm-10 mm.

  Moreover, the side edge of the absorber 13 is formed on the portion of the gathered nonwoven fabric 15 that extends outward in the width direction from the absorber 13 together with the portion of the skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 where the absorber 13 is not interposed. When folding back to the non-skin side so as to entrain the part, between the side edge of the absorbent body 13 and the encapsulating sheet 14 and between the encapsulating sheet 14 and the gathered nonwoven fabric 15 at the side edge part of the absorbent body 13 respectively. It is desirable to arrange it so as to be in close contact with the side edge side of the absorber 13 so that no space is provided. Thereby, the side edge of the absorber 13 is reinforced by the said encapsulating sheet 14 and the gathered nonwoven fabric 15, the compression and deformation | transformation of the absorber 13 are suppressed, and the danger that a pulp and a polymer will isolate | separate and spill will fall.

  Next, the example of the form of the raw material used for the said skin side encapsulation sheet 16 and the non-skin side encapsulation sheet 17 is demonstrated. As a 1st form example, as FIG. 5 shows, a nonwoven fabric can be used for the skin side encapsulation sheet 16a, and a crepe paper can be used for the non-skin side encapsulation sheet 17a. If both the skin side and the non-skin side of the absorbent body 13 are covered with a non-woven fabric, the softness of the absorbent body 13 may not be impaired, but there is no stiffness, and twisting occurs at the time of wearing, causing leakage. There was a thing. On the other hand, it is preferable to use a non-woven fabric from the viewpoint of softening the skin contact and enhancing cushioning on the side close to the skin surface. Therefore, in order to give the absorbent body 13 firmness and strength to prevent deformation and improve skin contact, only the skin-side encapsulating sheet 16a is made of non-woven fabric, and the non-skin-side encapsulating sheet 17a is made of crepe paper. As the non-woven fabric, hydrophilic ones are preferable, and composite non-woven fabrics such as SMS (spunbond / meltblown / spunbond) and SMMS (spunbond / meltblown / meltblown / spunbond), pointbonded non-woven fabric, polylaminated non-woven fabric and the like are suitable. Can be used for As the crepe paper, it is also possible to use thin paper or tissue paper.

  Next, as a second embodiment, as shown in FIG. 6, the non-skin-side encapsulating sheet 17b can be made of a material having a lower hydrophilicity than the skin-side encapsulating sheet 16b. As shown in FIG. 6, this example is particularly suitable for a disposable paper diaper in which an indicator 20 showing a color reaction is arranged on the non-skin side of the absorbent body 13 by contact with a body fluid. In the diaper provided with the indicator 20, when a material having a high hydrophilicity is used as a covering sheet (non-skin side covering sheet) covering the non-skin side of the absorbent body 13 in contact with the indicator 20, The moisture of the absorber 13 that has absorbed the moisture easily propagates to the indicator 20 through the non-skin-side encapsulating sheet, and the problem that the indicator 20 is discolored even in an unused state is likely to occur. Therefore, by configuring the non-skin-side encapsulating sheet 17b with a material having a lower hydrophilicity than the skin-side encapsulating sheet 16b, the moisture of the absorber 13 is difficult to propagate through the non-skin-side encapsulating sheet 17b.

  Such adjustment of the hydrophilicity is made by using a material having a different hydrophilicity such as regenerated fiber such as rayon or cupra or natural fiber such as cotton, or an olefin, polyester or polyamide such as polyethylene or polypropylene. A synthetic fiber such as a system can be surface-treated with a surfactant, and the coating amount of the surfactant can be adjusted.

  Next, in the third embodiment, as shown in FIG. 7, a waterproof film is used as the non-skin side encapsulating sheet 17c. By using a waterproof film as the non-skin-side encapsulating sheet 17c disposed on the non-skin side of the absorbent body 13, leakage of the body fluid absorbed by the absorbent body 13 to the non-skin side is ensured. Unlike the waterproof sheet 12 provided in the absorbent main body 10, it is not necessary to provide a separate waterproof sheet on the non-skin side of the absorber 13. Therefore, the number of materials used can be reduced, and the material cost can be reduced. The skin-side encapsulating sheet 16c may be any water-permeable material such as a nonwoven fabric or crepe paper, but it is preferable to use a hydrophilic nonwoven fabric.

  Further, in the fourth embodiment, as shown in FIG. 8, the skin side encapsulating sheet 16d and the non-skin side encapsulating sheet 17d are each composed of non-woven fabrics having different fiber densities. Thereby, the transition of the body fluid is increased by the capillary phenomenon from the nonwoven fabric having a relatively low fiber density toward the nonwoven fabric having a high fiber density.

For example, when the non-skin-side encapsulating sheet 17d uses a non-woven fabric having a higher fiber density than the skin-side encapsulating sheet 16d, as shown in FIG. From the skin-side encapsulating sheet 16d having a relatively low fiber density located on the non-skin side toward the non-skin-side encapsulating sheet 17d having a relatively high fiber density that is doubled by folding on the skin side. Capillary phenomenon facilitates the transfer of body fluids. As a result, the body fluid accumulated on both sides of the absorbent body 13 can be easily drawn into the absorbent body 13 and the absorption performance is improved. It is preferable to set each fiber density so that the difference in fiber density at which body fluid is likely to be drawn by the capillary phenomenon is about 10 to 300 kg / m ³ .

  On the other hand, the nonwoven fabric whose fiber density is higher in the skin-side encapsulation sheet 16d than in the non-skin-side encapsulation sheet 17d may be used. In this case, since the nonwoven fabric having a relatively high fiber density is disposed on the skin side of the absorbent body 13, the cushioning property is improved and the skin contact is improved.

  By the way, the portion of the non-skin-side encapsulating sheet 17 that is folded back to the non-skin side does not have to be joined to the outer surface of the non-skin-side encapsulating sheet 17 as shown in FIG. As described above, the encapsulating sheet joining portion 21 may be joined to the outer surface of the non-skin-side encapsulating sheet 17. In the disposable paper diaper 1, the side edge of the gathered nonwoven fabric 15 is folded back together with the side edge of the encapsulating sheet 14 in the manufacturing process, and the gathered nonwoven fabric is joined to the outer surface side of the encapsulating sheet. Even if 21 is not provided, the folding of the encapsulating sheet 14 does not return. Rather, by not joining the folded encapsulating sheet, it is possible to prevent the penetration of bodily fluid due to the provision of the joining portion, so that the absorption performance of the absorbent body 13 can be improved and the leakage of bodily fluid is less likely to occur. . Moreover, in this disposable paper diaper 1, although the planar shape of the absorber 13 is made into the square shape, in order to ease the hit | hit to the leg periphery of a crotch part, it may be formed by the fit cut shape which both sides were dented. is there. In that case, the influence of the hardness by an adhesive etc. can be relieved in the part which the absorber 13 of the encapsulating sheet 14 which encapsulates the absorber 13 in a square shape does not intervene.

  In the above embodiment, as shown in FIG. 3, the side ends of the folded skin-side encapsulating sheet 16 and the non-skin-side encapsulating sheet 17 are formed so as to match each other, but the side ends are matched. Since there may be a case where the level difference due to is increased and a sense of incongruity may be felt, the side edges of the skin side encapsulating sheet 16 and the non-skin side encapsulating sheet 17 can be arranged so as to be shifted in the diaper width direction. In this case, the side end of the non-skin-side encapsulating sheet 17 may be disposed so as to extend from the side end of the skin-side encapsulating sheet 16 toward the center in the width direction. It is preferable to dispose the non-skin-side encapsulating sheet 17 so as to extend from the side end to the center in the width direction, because a polymer spillage from the peripheral joint 18 is less likely to occur.

  Note that both ends of the enveloping sheet 14 in the longitudinal direction of the diaper are not folded back, and the portions joined at the peripheral joint 18 are arranged in a state of extending to the outside of the absorber 13.

(Structure of exterior sheet 30)
As shown in FIG. 2, the exterior sheet 30 is a two-layer nonwoven fabric sheet composed of an upper layer nonwoven fabric 30A and a lower layer nonwoven fabric 30B, and various elastic elastic members 34, 35 between the upper layer nonwoven fabric 30A and the lower layer nonwoven fabric 30B. Is provided and is provided with elasticity. The planar shape is formed with a concave notch 39 for forming leg openings LO on both sides of the middle, forming a pseudo hourglass shape as a whole.

  As shown in FIG. 2, the elastic elastic members are spaced apart vertically between the waist elastic elastic members 34, 34... Arranged in the waist opening WO and the front body F and the back body B. And a plurality of waist elastic elastic members 35, 35... Arranged along the horizontal direction.

(Measuring method)
The hydrophilicity is automatically measured using a liquid permeability measuring device corresponding to the liquid permeation time measuring method of EDANA 150.3-96.

  The fiber density is calculated by dividing the basis weight by the thickness.

  The basis weight is measured as follows. After the sample has been pre-dried, it is left in a test room or apparatus in a standard state (temperature 20 ° C. ± 5 ° C., relative humidity 65% or less) until it reaches a constant weight. The preliminary drying is to make a sample constant in an environment not exceeding 10 to 25% relative humidity and a temperature of 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. The sample which became a constant weight is cut out to a size of 200 mm × 250 mm (± 2 mm) with a rice slab (200 mm × 250 mm, ± 2 mm) and used for measurement. The weight of the cut sample is measured, multiplied by 20, and the weight per square meter is calculated and used as the basis weight.

Further, the thickness, using Kato Tech Co. handy compression tester (KES-G5), a load 10 gf / cm ^2, is obtained by automatic measurement under the conditions of the pressure area 2 cm ^2.

  As shown below, the softness evaluation test of the disposable paper diaper 1 (Example) which concerns on this invention and the conventional paper diaper (comparative example) was done. The test method and results are shown below.

  The disposable paper diaper 1 according to the above example used spunbond as the liquid-permeable top sheet 3, SMS as the skin-side encapsulating sheet 16, and crepe paper as the non-skin-side encapsulating sheet 17. Main sheet weights are as shown in Table 1. The absorber 13 used was a flat shape formed in a fit cut shape in which both side portions were recessed in order to reduce the contact of the crotch portion around the legs. Further, the portions where both side portions of the non-skin-side encapsulating sheet 17 are folded back to the non-skin side are not joined to the outer surface side of the non-skin-side encapsulating sheet 17.

  The paper diaper according to the comparative example used spunbond as the liquid-permeable top sheet, SMS as the skin side encapsulating sheet, and crepe paper as the non-skin side encapsulating sheet. Main sheet weights are as shown in Table 1. Moreover, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2007-202596), a covering sheet (skin-side encapsulating sheet) provided on the surface side of a bodily fluid absorber as a covering sheet for covering the bodily fluid absorber ) And a covering sheet (non-skin-side encapsulating sheet) provided on the back surface side are joined at the outer periphery of the body fluid absorber, and this joining portion is folded outward and joined to the back surface of the back surface side covering sheet. Used. Moreover, the thing formed with the fit cut shape was used similarly to the said Example as an absorber.

表１の結果、本発明に係る使い捨て紙おむつ１（実施例）では、従来の紙おむつのように、非肌側被包シート１７を非肌側に折り返した部分を、非肌側被包シート１７の外面側に接合していないため、フィットカット部分において接着剤などによる硬さの影響が和らげられるようになる。 As a method for evaluating the softness, the softness when touching the skin contact surface of the fit cut portion where no absorber of each diaper is interposed with 15 test subjects was evaluated in five stages from very soft to hard. This was converted into a score, and the average value was used as the softness evaluation value. The relationship between the evaluation stage and the score was as follows: very soft: 5 points, soft: 4 points, neither: 3 points, hard: 2 points, very hard: 1 point.

As a result of Table 1, in the disposable paper diaper 1 (Example) according to the present invention, the portion of the non-skin-side encapsulating sheet 17 that is not folded to the non-skin-side encapsulating sheet 17 is used as in the conventional disposable diaper. Since it is not joined to the outer surface side, the influence of the hardness due to the adhesive or the like is relieved in the fit cut portion.

  DESCRIPTION OF SYMBOLS 1 ... Disposable paper diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable top sheet, 12 ... Waterproof sheet, 13 ... Absorber, 14 ... Encapsulated sheet, 15 ... Gathered nonwoven fabric, 16 ... Skin side encapsulated sheet, 17 ... Non-skin side encapsulated sheet, 18 ... peripheral joint, 19 ... gathered nonwoven joint, 21 ... encapsulated sheet joint, 30 ... exterior sheet, 30A ... upper layer nonwoven, 30B ... lower layer nonwoven

Claims (6)

An absorbent body including at least an absorbent body and an encapsulating sheet that encapsulates the absorbent body, and a gathered nonwoven fabric that forms three-dimensional gathers that stand on the skin side on both sides of the skin surface, and the absorbent body In disposable paper diapers consisting of an exterior sheet integrally provided on the outer surface side of the main body,
The encapsulating sheet comprises a skin-side encapsulating sheet provided on the skin side of the absorber and a non-skin-side encapsulating sheet provided on the non-skin side of the absorber, and the skin-side encapsulating sheet And the periphery of the non-skin-side encapsulating sheet is formed with a joined portion in which the skin-side encapsulating sheet and the non-skin-side encapsulating sheet are joined without the absorber.
The gathered nonwoven fabric is disposed on both sides of the absorbent body on the skin surface side, and the portions of the gathered nonwoven fabric that extend outward in the width direction from the absorbent body are defined as the skin-side encapsulation sheet and the non-skin-side encapsulation. The width direction outer edge of the gathered nonwoven fabric is wider than the width direction outer edge of the encapsulating sheet in a state where the side edge portion of the absorber is wound together with the portion of the sheet where the absorber is not interposed and folded back to the non-skin side. While extending to the center side, the gathered nonwoven fabric is joined to the outer surface side of the skin-side encapsulating sheet and the non-skin-side encapsulating sheet across the width direction outer edge of the encapsulating sheet ,
The encapsulation is performed so that no space is provided between the side edge of the absorber and the encapsulation sheet and between the encapsulation sheet and the gathered nonwoven fabric at the side edge of the absorber. A disposable paper diaper, wherein the sheet and the gathered nonwoven fabric are arranged so as to be in close contact with a side edge side of the absorber .   The disposable paper diaper according to claim 1, wherein the skin-side enveloping sheet is made of non-woven fabric, and the non-skin-side enveloping sheet is made of crepe paper.   The disposable diaper according to claim 1, wherein the non-skin side encapsulating sheet uses a material having a lower hydrophilicity than the skin side encapsulating sheet.   The disposable paper diaper according to claim 1, wherein the non-skin-side encapsulating sheet is made of a waterproof film, and a non-skin-proof sheet is not provided on the non-skin side of the absorber.   The disposable paper diaper according to claim 1, wherein each of the skin-side encapsulated sheet and the non-skin-side encapsulated sheet is composed of nonwoven fabrics having different fiber densities.   The disposable paper diaper according to any one of claims 1 to 5, wherein portions where both side portions of the non-skin-side encapsulating sheet are folded back to the non-skin side are not joined to the outer surface side of the non-skin-side encapsulating sheet.

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