JP2013121426A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable wearing article preventing decline in absorption in an absorber and enabling rapid migration of bodily fluid to the absorber.SOLUTION: A diaper 1 has a liquid-permeable inner surface sheet 20, a liquid-impermeable outer surface sheet 30, a liquid-absorptive absorber 40 positioned between the inner and outer surface sheets 20 and 30, and a leak prevention sheet 50 positioned between the absorber 40 and the outer surface sheet 30. A pair of entrapping sheets 60 spaced apart in the lateral direction X are formed on a skin-facing surface of the inner surface sheet 20. The absorber 40 has a liquid-absorptive core material 41 and a cover sheet 42, such as tissue paper, for covering the core material 41. The absorber 40 is provided with a plurality of recesses 45 from a bottom surface 44 to an absorption surface 43. The absorption surface 43 is not provided with any recesses 45 and is substantially level. First through fourth compression recesses 71-74 and a plurality of ridge parts 26 and groove parts 27 are formed on a surface 25 of the inner surface sheet 20.

Description

  The present invention relates to a disposable wearing article, and more specifically, a disposable diaper having a relatively small mass per unit area of a core material, a disposable toilet training pant, a disposable incontinence pant, a disposable sanitary pant, etc. This relates to a disposable wearing article.

  Conventionally, a wearing article provided with an absorber having a core material whose mass per unit area is reduced is known. For example, Patent Document 1 discloses a disposable diaper having an absorbent body made of a core material such as pulp and having a reduced mass of the core material. By reducing the mass per unit area of the core material, the absorber can be thinned and provided with sufficient flexibility. Such a core material with a small mass has reduced absorption performance, but by forming a hole penetrating in the thickness direction of the core material, the absorption area of the absorber is increased and the absorbability in the absorber is improved. be able to.

JP 2002-35036 A (JP2002-35036A)

  When the absorber described in Patent Document 1 as described above is used for a diaper, a liquid-permeable inner sheet is laminated on the absorption surface of the absorber. In the part where the hole is formed in the absorbent body, the inner sheet and the absorbent body do not come into contact with each other, so that body fluids such as urine are not easily transferred to the absorbent body and are likely to stay on the inner sheet. The urine staying on the inner sheet wets the wearer's skin and can cause discomfort and rash.

  An object of the present invention is to provide a disposable wearing article in which the absorbent body is thin and flexible, and the body fluid can be quickly transferred to the absorbent body without lowering the absorbability.

The present invention has a longitudinal direction and a lateral direction, and has a skin facing surface and a non-skin facing surface on the opposite side thereof, a front and back waist region, a crotch region located between these front and back waist regions, and the skin facing surface The present invention relates to improvement of a disposable wearing article including an inner surface sheet positioned on the outer surface sheet, an outer surface sheet positioned on the non-skin facing surface, and an absorber positioned between the inner and outer surface sheets and at least in the crotch region.
The present invention provides the disposable wearing article, wherein the absorbent body has a flat absorbent surface facing the inner sheet, and a bottom surface on which a plurality of concave portions facing the absorbent surface are formed, and the concave portion is at least the It is located in the crotch area.

  According to one or more embodiments of the present invention, in particular, the absorber has an absorbent surface facing the inner sheet and a bottom surface facing the outer sheet, and forms a recess on the bottom surface from the bottom surface toward the absorbent surface. In the absorption surface, the recess is not formed and is flattened. By forming the bottom recess of the absorber, the absorption area can be increased, so that sufficient absorption capacity can be maintained even if the mass per unit area of the core material is reduced. Moreover, since an inner surface sheet | seat is laminated | stacked on a flat absorption surface, these can contact each other and a bodily fluid can transfer to an absorber from an inner surface sheet | seat rapidly.

The figure which connected the front and back waist area of the disposable diaper which is one embodiment of a disposable wearing article. The partially broken top view seen from the skin opposing surface of the expanded diaper. The exploded perspective view of a diaper. The IV-IV line expanded sectional view of FIG. The enlarged view of the part enclosed by V of FIG. The expansion perspective view of an inner surface sheet.

  Referring to FIG. 1, a diaper 1 has a longitudinal direction Y and a lateral direction X, a front waist region 11 and a rear waist region 12, a crotch region 13 located between these front and rear waist regions 11, 12, and a lateral direction. It has front and rear end edges 14 and 15 extending in the X direction, and both side edges 16 extending in the vertical direction Y. The diaper 1 connects the front and rear waist regions 11 and 12 and the crotch region 13 to the wearer by detachably connecting a hook element 81 attached to the rear waist region 12 and a loop element 82 attached to the front waist region. Can be adhered to.

2 and 3, the diaper 1 has a virtual vertical center line 2-2 that bisects the dimension in the horizontal direction X, and is substantially symmetric with respect to the virtual vertical center line 2-3. .
The diaper 1 includes a liquid-permeable inner surface sheet 20 positioned on the skin facing surface, a liquid-impermeable outer surface sheet 30 positioned on the opposite side of the non-skin facing surface, and the inner and outer surface sheets 20, 30. A liquid-absorbing absorbent body 40 located at the top, and a leak-proof sheet 50 located between the absorbent body 40 and the outer sheet 30. A pair of containment sheets 60 that are spaced apart in the lateral direction X are formed on the skin facing surface of the inner surface sheet 20. These sheets are joined to each other by an adhesive means such as a hot melt adhesive (not shown).

As the outer sheet 30, a hydrophobic spunbond / meltblown / spunbond (hereinafter referred to as SMS) fiber nonwoven fabric, spunbond fiber nonwoven fabric, plastic sheet, or fiber nonwoven fabric having a mass of about 10 to 30 g / m ² A laminate of plastic sheets can be used. A loop element 82 constituting the fastening system is attached to the front waist region 11 on the non-skin facing surface of the outer sheet 30.

  A leakage prevention sheet 50 is bonded to the outer sheet 30. The leak-proof sheet 50 can be a liquid-impervious and breathable plastic film. The leak prevention sheet 50 has an area larger than that of the absorber 40 and prevents urine or the like absorbed by the absorber 40 from leaking out of the diaper 1. A hook element 81 constituting the fastening system is attached to the rear waist region 12 via the tab sheet 83 on the outer surface sheet 30. The tab sheet 83 is fixed between the containment sheet 60 and the outer sheet 30, and extends in the lateral direction X from both side edges 16, and a hook element 81 is attached to the extended portion.

  A leg elastic body 51 is fixed to the inner surface of the outer sheet 30 along both side edges 33. The leg elastic body 51 is fixed between the containment sheet 60 and the outer sheet 30 so as to be contractable in an extended state. As the leg elastic body 51, a plurality of string-shaped or strand-shaped elastic bodies can be used. Due to the contracting action of the leg elastic body 51, both side edges of the diaper 1 have a gasket function.

The absorbent body 40 is bonded to the inner surface of the leakage prevention sheet 50. The absorber 40 is located at least in the crotch region 13 and extends from the crotch region 13 to the front and rear waist regions 11 and 12 in this embodiment. The absorber 40 includes a liquid-absorbing core material 41 and a covering sheet 42 such as tissue paper that covers the core material 41. As the core material 41, fluff pulp, superabsorbent polymer particles, or a mixture thereof can be used. The core material 41 has a dimension in the lateral direction X in the crotch region 13 smaller than that in the front and rear waist regions 11 and 12. The core material 41 includes fluff pulp having a mass per unit area of about 150 to 250 g / m ² , and in this embodiment, the superabsorbent polymer further has a mass per unit area of about 150 to 250 g / m ^2. It contains particles and reduces the mass of the core material compared to conventional disposable diapers. When the mass of the core material 41 increases, the rigidity increases and the flexibility of the entire diaper 1 is impaired. However, by reducing the mass, the flexibility of the absorbent body 40 can be maintained, and the diaper 1 as a whole A supple feel can be achieved.

  Referring to FIG. 4, the absorber 40 has an absorption surface 43 located on the inner sheet 20 side and a bottom surface 44 located on the opposite side and located on the outer sheet 30 side. The absorber 40 is provided with a plurality of recesses 45 from the bottom surface 44 toward the absorption surface 43. The absorption surface 43 is not provided with the recess 45, and is substantially flat. The recess 45 can be formed by pressurizing and heating the absorber 40 from the bottom surface 44 toward the absorption surface 43. By providing the recess 45, the area where the core member 41 can absorb urine and the like on the bottom surface 44 can be increased. Since the mass of the core material of the absorbent body 40 is relatively small, the amount of absorption of bodily fluids such as urine may be reduced by that amount, but by providing the recess 45, the area that can absorb bodily fluids is increased. And since the area can be used effectively, even if it is an absorber with a small mass of a core material, sufficient absorption capability can be maintained.

  Since the mass per unit area of the core material 41 of the absorbent body 40 is reduced, the core material 41 is easily moved by the movement of the wearer's legs, etc., particularly in the crotch region 13, and the core material 41 is locally distributed. It tends to gather and become dense, or sparse around it. However, the core member 41 can be prevented from moving by providing the recess 45 in the absorber 40. In the recess 45, the core material 41 is pressurized, so the density of the core material 41 is higher than in other areas where the recess 45 is not provided. Therefore, the portion where the concave portion 45 is located has a high rigidity, and a difference in rigidity occurs between the other regions. Further, since the thickness of the concave portion 45 is reduced, the absorber 40 can be bent along the concave portion 45 in the vertical direction Y and the horizontal direction X so as to be in close contact with the wearer. Further, in the front and rear waist regions 11 and 12 where the recess 45 is not formed, the rigidity is lower than that of the region where the recess 45 is formed, and a supple texture can be realized. In the case where an assistant such as a mother wants an infant or the like to wear the diaper 1 with the diaper 1, the assistant often has the front and rear waist regions 11, 12 instead of the crotch region 13. The softness and softness of the diaper 1 can be realized.

  The area ratio of all the recesses 45 is about 2 to 10% of the area of the crotch region 13. The recess 45 has a dimension in the horizontal direction X of about 3 mm and a dimension in the vertical direction Y of about 1 mm, and extends in the horizontal direction X. The recess 45 adjacent to the lateral direction X has a spacing dimension of about 15 mm, and the recess 45 adjacent to the longitudinal direction Y has a spacing dimension of about 15 mm. The concave portions 45 adjacent to each other in the vertical direction Y are arranged so as not to overlap each other, and are arranged so as to draw a so-called staggered pattern by the plural concave portions 45. The diaper 1 is easy to bend along the concave portion 45, but when the concave portion 45 extends in the lateral direction X, the diaper 1 is easily bent so that the front and rear end edges 14 and 15 are brought closer to each other particularly in the crotch region 13. Therefore, the diaper 1 can be easily adhered to the wearer's crotch. Further, since the recess 45 extends in the horizontal direction X, it is difficult to bend along the virtual line extending in the vertical direction Y. Therefore, even when both side edges 16 of the diaper 1 are pressed inward in the lateral direction X by the wearer's thigh while the diaper 1 is worn, the absorber 40 can be prevented from being bent.

Referring to FIG. 3 again, the inner sheet 20 is joined to the absorbing surface 43 of the absorber 40. The inner sheet 20 has a front surface 25 located on the skin facing surface and a back surface 24 on the opposite side, and is laminated so that the back surface 24 faces the absorption surface 43 of the absorber 40. As the inner surface sheet 20, for example, a through-air fiber nonwoven fabric having a mass of about 15 to 35 g / m ^2, preferably about 25 to 30 g / m ² can be used.

  4 to 6, the inner surface sheet 20 has a central region 28 having a plurality of flange portions 26 and groove portions 27 on the surface 25 thereof, and is positioned outside the central region 28 in the lateral direction X. And flat side portions 29 where the groove portions 27 are not formed. The flange portions 26 and the groove portions 27 extend in the vertical direction Y and are alternately arranged in the horizontal direction X. The pitch of the collar part 26 and the groove part 27 shall be about 2-7 mm.

  The flange portion 26 and the groove portion 27 of the inner surface sheet 20 can be manufactured by the following method. A fiber nonwoven fabric can be used as the inner sheet 20, and the fiber nonwoven is formed by a card web in which staples are accumulated. The card web is placed on a traveling belt and conveyed in the machine direction, and jet air and jet heated from a plurality of nozzles provided at regular intervals in the crossing direction so as to cross the card web. Sprays fluid such as water and jet steam. In the card web on which the fluid is ejected, the staples partially move in the crossing direction, and the groove portion 27 is formed at the portion where the fluid is ejected, and the flange portion 26 is formed on both sides thereof. The fluid is ejected at a portion corresponding to the central region 28 and is not ejected at a portion corresponding to the both side regions 29. The inner sheet 20 manufactured in this way has a higher staple density in the collar portion 26 than in the groove portion 27.

  5 and 6, the surface 25 is formed with a plurality of pressing recesses 70. The pressing recessed part 70 is comprised by the 1st-4th pressing recessed parts 71-74, and the 1st pressing recessed part 71 is located in the intersection of the 1st virtual zone 75 and the 2nd virtual zone 76 on a straight line. The distance between the side edges defining the first and second imaginary bands 75 and 76, that is, the width, is substantially the same as the diameter of the opening when the first pressing recess 71 is circular. At least the center of the second compressed recess 72 does not coincide with the centers of the first and second virtual bands 75 and 76, and a part thereof overlaps with the first and second virtual bands 75 and 76. Therefore, the center of the first pressing recess 71 and the second pressing recess 72 does not overlap with each other. The third pressing recess 73 does not overlap the first and second virtual bands 75 and 76, and the dimension from the center of the first pressing recess 71 to the center of the third pressing recess 73 is the first pressing recess 71. Is smaller than the dimension from the center to the center of the second pressing recess 72, specifically about 1.8 mm. The center of the fourth pressing recess 74 coincides with one of the first and second virtual bands 75 and 76. The first and second virtual bands 75 and 76 intersect with the virtual vertical center line 2-2 and are symmetric with respect to the virtual vertical center line 2-2.

  On the first and second virtual bands 75 and 76, the first pressing recesses 71 are separated from each other by approximately 15 mm, and the second pressing recesses 72 positioned therebetween are spaced from each other by approximately 1 mm. The second pressing recess 72 is provided symmetrically with the first and second virtual bands 75 and 76. In this embodiment, there is one fourth pressing recess 74 positioned between the first pressing recesses 71, and a pair of second pressing recesses 72 is between the first pressing recess 71 and the fourth pressing recess 74. Is provided. If the centers of the first pressing recess 71 and the second pressing recess 72 are linearly arranged on the first and second virtual bands 75 and 76, the inner surface sheet 20 is linearly recessed along these. The wearer's skin is stimulated by the contact of the linear dents with the wearer's skin. However, since the center of the 2nd pressing recessed part 72 does not correspond with the 1st and 2nd virtual bands 75 and 76 like this embodiment, between the 1st pressing recessed parts 71, the inner surface sheet 20 is 1st and There is no linear recess along the second virtual bands 75 and 76. In other words, since it dents so as to meander partially away from the first and second virtual bands 75 and 76, it is difficult to irritate the wearer's skin. In addition, it can give a soft impression to the eyes. Further, the inner sheet 20 as a whole is bent along the vicinity of the first and second imaginary bands 75 and 76, and the first and second imaginary bands 75 and 76 intersect with each other. It bends flexibly and easily adheres to the wearer's skin. Furthermore, the 3rd pressing recessed part 73 gives a soft impression, without making the intersection of the 1st and 2nd virtual belts 75 and 76 visually stand out by being provided in multiple numbers in the vicinity of the 1st pressing recessed part 71. Can do. It is desirable that the third pressing recess 73 has a smaller diameter than the second and fourth pressing recesses 72 and 74.

  The separation dimension of the first pressing recess 71 is the separation dimension of the adjacent first virtual band 75 and the separation dimension of the adjacent second virtual band 76. By relatively increasing these separation dimensions, the inner surface sheet 20 can be made to maintain a bulky and soft feel without making the thickness dimension of the inner surface sheet 20 unreasonably small.

  The pressing recess 70 is disposed so as to overlap both the flange portion 26 and the groove portion 27. When any of the compressed recesses 70 coincides with the flange portion 26, a part of the flange portion 26 is compressed in the thickness direction, and the thickness dimension is made smaller than the other portions. Similarly, when a pressing recessed part corresponds to the groove part 27, a part of groove part 26 is compressed in the thickness direction, and the thickness dimension is made smaller than another part. However, the amount of compression of the groove 26 is smaller than that of the flange 26.

  Since the bottom surface 24, which is a flat surface of the inner surface sheet 20, and the absorption surface 43, which is a flat surface of the absorber 40, face each other, the bottom surface 24 of the inner surface sheet 20 contacts almost the entire surface of the absorption surface 43. If a concave portion is formed on the absorption surface 43, the contact area between the absorption surface 43 and the bottom surface 24 is reduced, and the body fluid is less likely to move from the inner surface sheet 20 to the absorber 40. In the embodiment, this can be prevented, and body fluid can be prevented from accumulating on the inner surface sheet 20.

  The separation dimension of the first pressing recess 71 adjacent to the longitudinal direction Y is made larger than the separation dimension of the recess 45 adjacent to the longitudinal direction Y. By providing the recessed part 45 in the absorber 40, the rigidity becomes higher compared with the case where this is not provided, but the recessed part 45 is formed by increasing the separation dimension of the first pressing recessed part 71 of the inner surface sheet 20. It is possible to prevent the rigidity of the crotch region 13 from becoming excessively large in the entire crotch region 13.

  The collar portion 26 of the inner surface sheet 20 has a higher staple density than the groove portion 27. The inner surface sheet 20 is formed with a pressing concave portion 70 that overlaps the flange portion 26 and the groove portion 27, and the density is further increased at the portion where the pressing concave portion 70 is formed. Therefore, in particular, the body fluid is likely to gather in the pressing recess 70 of the collar 26, and the body fluid moves from the vicinity of the pressing recess 70 to the absorber 40. The absorber 40 has a recess 45 on its bottom surface 44, and the density of the core material 41 is high in the portion where the recess 45 is located. Therefore, the body fluid easily moves from the compressed recess 70 of the inner surface sheet 20 toward the recess 45 of the absorbent body 40, and the body fluid can be further prevented from remaining on the inner surface sheet 20. In this embodiment, the fiber nonwoven fabric in which the collar portion 26 and the groove portion 27 are formed as a single layer is used as the inner surface sheet 20. For example, a fiber nonwoven fabric in which the collar portion 26 and the groove portion 27 are not formed is laminated on the back surface side. It can also be used.

Referring to FIG. 3 again, in the inner sheet 20, the central region 28 overlaps the absorber 40, and both side regions 29 are located outside the lateral direction X of the absorber 40. A containment sheet 60 is attached to both side regions 29. As the containment sheet 60, an SMS fiber nonwoven fabric having a mass of about 10 to 30 g / m ² can be used. The front and rear end edges 61 and 62 of the containment sheet 60 coincide with the front and rear end edges 21 and 22 of the inner surface sheet 20 and are bonded to each other. Since the front and rear end edges 21 and 22 are bonded to the flat side regions 29 of the inner sheet 20, they can be firmly bonded. The proximal edge 63 of the containment sheet 60 overlaps the side edges 33 of the outer sheet 30 and they are joined together. The distal edges 64 of the containment sheet 60 are spaced apart in the lateral direction X, and these distal edges 64 overlap the inner sheet 20 but are not joined thereto and can be separated from the inner sheet 20. Is done. A sleeve portion (not shown) is formed on the distal edge portion 64, and an elastic body 65 extending in the longitudinal direction Y is attached to the sleeve portion so as to be contractable in an extended state. By attaching the elastic body 65 in this manner, the distal edge portion 64 is separated so as to stand up from the inner surface sheet 20 and closely contacts the wearer's skin, thereby preventing urine and the like from leaking to the outside of the diaper 1.

  According to the diaper 1 as described above, by forming the recess 45 on the bottom surface 44 of the absorbent body 40, even if the absorbent body has a small mass per unit area of the core material 41, the absorbency is reduced. There is no. Moreover, since the flat absorption surface 43 in which the recessed part 45 is not formed and the inner surface sheet 20 face each other, the facing area is not reduced, and body fluid quickly moves from the inner surface sheet 20 to the absorber 40. In addition, body fluid can be prevented from staying on the inner surface sheet 20.

The disclosure relating to the present invention described above can be summarized at least in the following matters.
The present invention relates to the improvement of the following disposable wearing article 1. The disposable wearing article 1 has a longitudinal direction Y and a lateral direction X, and is between the skin facing surface and the non-skin facing surface that is the opposite side, the front and rear waist regions 11 and 12, and the front and rear waist regions 11 and 12. Located between the crotch region 13 positioned, the inner sheet 20 positioned on the skin facing surface, the outer sheet 30 positioned on the non-skin facing surface, and the inner and outer sheets 20, 30, and at least the crotch region 13 And the absorber 40 located in the area.

This invention is characterized by the following points in the disposable wearing article 1.
The absorbent body 40 has a flat absorbent surface 43 that faces the inner surface sheet 20 and a bottom surface 44 in which a plurality of recesses 45 are formed toward the absorbent surface 43. The recess 45 is located at least in the crotch region 13.

The above invention can include at least the following embodiments.
(1) The inner sheet 20 includes first and second virtual bands 75 and 76 that intersect with each other, and a plurality of first pressing recesses 71 located at the intersections of the first and second virtual bands 75 and 76, and A second squeezing recess 72 that partially overlaps one of the first and second virtual bands 75 and 76 is formed.
(2) The distance between the side edges that define the first and second virtual bands 75 and 76 is the same as the diameter of the opening when the first pressing recess 71 is circular.
(3) The inner sheet 20 is formed with a third pressing recess 73 that does not overlap the first and second virtual bands 75, 76, and the third pressing recess 73 extends from the center of the first pressing recess 71. The dimension to the center is smaller than the dimension from the center of the first pressing recess 71 to the center of the second pressing recess 72.
(4) The spacing dimension in the longitudinal direction Y of the first pressing recess 71 is made larger than the spacing dimension in the longitudinal direction Y of the recess 45.
(5) The inner surface sheet 20 has a front surface 25 located on the skin facing surface and a flat rear surface 24 facing the absorber 40. The front surface 25 includes a plurality of flange portions 26 and the wrinkles. Grooves 27 located between the parts 26 are formed.
(6) The flange portions 26 and the groove portions 27 extend in the vertical direction Y and are alternately arranged in the horizontal direction X.
(7) The inner surface sheet 20 is positioned on both sides of the central region 28 in the lateral direction X of the central region 28 in which the flange portion 26 and the groove portion 27 are formed, and the flange portion 26 and the groove portion 27 are not formed. And both side regions 29.
(8) The area ratio of the recess 45 of the absorber 40 is 2 to 10% of the area of the absorber 40 in the crotch region 13.
(9) The absorber 40 includes a liquid-absorbing core material 41, and the density of the core material 41 is increased in the recess 45 as compared with other regions.
(10) The core material 41 includes fluff pulp having a mass per unit area of 150 to 250 g / m ² .

  In addition to the materials described in this specification, various constituent materials that are normally used in this type of field are limited to the constituent members of the disposable diaper 1 that is an example of a disposable wearing article. Can be used. In the specification of the present invention, the terms “first”, “second”, “third”, and “fourth” are simply used to distinguish similar elements, positions, and the like.

1 disposable wearing articles (diapers)
11 front waist region 12 rear waist region 13 crotch region 20 inner surface sheet 24 back surface 25 surface 26 flange portion 27 groove portion 28 central region 29 both side regions 30 outer surface sheet 40 absorbent body 41 core material 43 absorbent surface 44 bottom surface 45 concave portion 71 first compressed concave portion 72 2nd pressing recessed part 73 3rd pressing recessed part 75 1st virtual zone 76 2nd virtual zone X Horizontal direction Y Vertical direction

The present invention relates to a disposable diaper , and more particularly, to a disposable diaper having an absorbent body having a relatively small mass per unit area of a core material.

Conventionally, the disposable diaper provided with the absorber which has a core material with small mass per unit area is publicly known. For example, Patent Document 1 discloses a disposable diaper having an absorbent body made of a core material such as pulp and having a small mass of the core material. By reducing the mass per unit area of the core material, the absorber can be thinned and provided with sufficient flexibility. Such a core material with a small mass has reduced absorption performance, but by forming a hole penetrating in the thickness direction of the core material, the absorption area of the absorber is increased and the absorbability in the absorber is improved. be able to.

An object of the present invention is to provide a disposable diaper in which the absorbent body is thin and has flexibility, the absorbability is not lowered, and body fluid can be quickly transferred to the absorbent body.

The present invention has a longitudinal direction and a lateral direction, and has a skin facing surface and a non-skin facing surface on the opposite side thereof, a front and back waist region, a crotch region located between these front and back waist regions, and the skin facing surface A disposable sheet comprising: an inner sheet positioned on the outer skin; an outer sheet positioned on the non-skin facing surface; and an absorbent body positioned between the inner and outer sheet and positioned at least in the crotch region and having an absorbent core. Involved in improving diapers .
The present invention, in the disposable diaper, the absorbent body has a flat absorbing surface facing the inner sheet, and a bottom surface having a plurality of recesses toward the absorbing surface is formed, the concave portion, the core It is formed by pressurizing a material in the thickness direction, is located only in the crotch region and is spaced apart in the vertical direction and the horizontal direction, and the dimension in the horizontal direction is larger than the dimension in the vertical direction And

The figure which connected the front and back waist area of the disposable diaper which is one embodiment of this invention . The partially broken top view seen from the skin opposing surface of the expanded diaper. The exploded perspective view of a diaper. The IV-IV line expanded sectional view of FIG. The enlarged view of the part enclosed by V of FIG. The expansion perspective view of an inner surface sheet.

2 and 3, the diaper 1 has a virtual vertical center line 2-2 that bisects the dimension in the horizontal direction X, and is substantially symmetric with respect to the virtual vertical center line 2-2 . .
The diaper 1 includes a liquid-permeable inner surface sheet 20 positioned on the skin facing surface, a liquid-impermeable outer surface sheet 30 positioned on the opposite side of the non-skin facing surface, and the inner and outer surface sheets 20, 30. A liquid-absorbing absorbent body 40 located at the top, and a leak-proof sheet 50 located between the absorbent body 40 and the outer sheet 30. A pair of containment sheets 60 that are spaced apart in the lateral direction X are formed on the skin facing surface of the inner surface sheet 20. These sheets are joined to each other by an adhesive means such as a hot melt adhesive (not shown).

As the outer surface sheet 30, a hydrophobic spunbond / meltblown / spunbond (hereinafter referred to as SMS) fiber nonwoven fabric , spunbond fiber nonwoven fabric, plastic sheet, or a fiber nonwoven fabric and a plastic having a mass of about 10 to 30 g / m ² A laminate of sheets can be used. A loop element 82 constituting the fastening system is attached to the front waist region 11 on the non-skin facing surface of the outer sheet 30.

4 to 6, the inner surface sheet 20 has a central region 28 having a plurality of flange portions 26 and groove portions 27 on the surface 25 thereof, and is positioned outside the central region 28 in the lateral direction X. And both flat regions 29 in which the groove 27 is not formed. The flange portions 26 and the groove portions 27 extend in the vertical direction Y and are alternately arranged in the horizontal direction X. The pitch of the collar part 26 and the groove part 27 shall be about 2-7 mm.

The flange portion 26 and the groove portion 27 of the inner surface sheet 20 can be manufactured by the following method. A fiber nonwoven fabric can be used as the inner sheet 20, and the fiber nonwoven fabric is formed by a card web in which staples are accumulated. The card web is placed on a traveling belt and conveyed in the machine direction, and jet air and jet heated from a plurality of nozzles provided at regular intervals in the crossing direction so as to cross the card web. Sprays fluid such as water and jet steam. In the card web on which the fluid is ejected, the staples partially move in the crossing direction, and the groove portion 27 is formed at the portion where the fluid is ejected, and the flange portion 26 is formed on both sides thereof. The fluid is ejected at a portion corresponding to the central region 28 and is not ejected at a portion corresponding to the both side regions 29. The inner sheet 20 manufactured in this way has a higher staple density in the collar portion 26 than in the groove portion 27.

The pressing recess 70 is disposed so as to overlap both the flange portion 26 and the groove portion 27. When any of the compressed recesses 70 coincides with the flange portion 26, a part of the flange portion 26 is compressed in the thickness direction, and the thickness dimension is made smaller than the other portions. Similarly, when a pressing recessed part corresponds to the groove part 27, a part of groove part 27 is compressed to the thickness direction, and the thickness dimension is made smaller than another part. However, the compression amount of the groove portion 27 is smaller than that of the flange portion 26.

The back 24 is a flat surface of the inner sheet 20, the absorption surface 43 is a flat surface of the absorbent body 40 from opposite, in almost the entire surface of the absorbing surface 43, back surface 24 of the inner sheet 20 contacts. If a concave portion is formed on the absorption surface 43, the contact area between the absorption surface 43 and the back surface 24 is reduced, and body fluid is less likely to move from the inner surface sheet 20 to the absorber 40. In the embodiment, this can be prevented, and body fluid can be prevented from accumulating on the inner surface sheet 20.

The disclosure relating to the present invention described above can be summarized at least in the following matters.
The present invention relates to an improvement of the following disposable diaper 1. The disposable diaper 1 has a longitudinal direction Y and a lateral direction X, and is positioned between the skin facing surface and the non-skin facing surface that is the opposite side, the front and rear waist regions 11 and 12, and the front and rear waist regions 11 and 12. The crotch region 13, the inner surface sheet 20 positioned on the skin facing surface, the outer sheet 30 positioned on the non-skin facing surface, and the inner and outer surface sheets 20, 30 and at least in the crotch region 13. And an absorbent body 40 having a liquid-absorbing core .

This invention is characterized by the following points in the disposable diaper 1.
The absorbent body 40 has a flat absorbent surface 43 that faces the inner surface sheet 20 and a bottom surface 44 in which a plurality of recesses 45 are formed toward the absorbent surface 43. The concave portion 45 is formed by pressing the core material in the thickness direction, is located only in the crotch region 13 and is arranged apart in the vertical direction Y and the horizontal direction X, and has a dimension in the horizontal direction X. It is larger than the dimension in the longitudinal direction Y.

In addition to the materials described in this specification, various known materials that are usually used in this kind of field can be used without limitation for the respective constituent members constituting the disposable diaper 1 . In the specification of the present invention, the terms “first”, “second”, “third”, and “fourth” are simply used to distinguish similar elements, positions, and the like.

The present invention has a longitudinal direction and a lateral direction, and has a skin facing surface and a non-skin facing surface on the opposite side thereof, a front and back waist region, a crotch region located between these front and back waist regions, and the skin facing surface A disposable sheet comprising: an inner sheet positioned on the outer skin; an outer sheet positioned on the non-skin facing surface; and an absorbent body positioned between the inner and outer sheet and positioned at least in the crotch region and having an absorbent core. For diapers .
The present invention, in the disposable diaper, the absorbent body, and a flat absorbing surface facing the inner sheet, and a bottom surface which is opposite to the absorbing surface, said the bottom going toward the absorbing surface Bomb plurality of recesses are formed, the recess be formed by pressurizing the core material in the thickness direction, while located only in the crotch region is disposed so as to draw the zigzag pattern, the The dimension in the horizontal direction is larger than the dimension in the vertical direction.

A leg elastic body 51 is fixed to the inner surface of the outer sheet 30 along both side edges 33. The leg elastic body 51 is fixed between the containment sheet 60 and the outer sheet 30 so as to be contractable in an extended state. As the leg elastic body 51, a plurality of string-shaped or strand-shaped elastic bodies can be used. Due to the contracting action of the leg elastic body 51, both side edges 16 of the diaper 1 have a gasket function.

Referring to FIG. 4, the absorber 40 has an absorption surface 43 located on the inner sheet 20 side, and a bottom surface 44 located on the outer sheet 30 side opposite to the absorption surface 43 . The absorber 40 is provided with a plurality of recesses 45 that are recessed from the bottom surface 44 toward the absorption surface 43. The absorption surface 43 is not provided with the recess 45, and is substantially flat. The recess 45 can be formed by pressurizing and heating the absorber 40 from the bottom surface 44 toward the absorption surface 43. By providing the recess 45, the area where the core member 41 can absorb urine and the like on the bottom surface 44 can be increased. Since the mass of the core material of the absorbent body 40 is relatively small, the amount of absorption of bodily fluids such as urine may be reduced by that amount, but by providing the recess 45, the area that can absorb bodily fluids is increased. And since the area can be used effectively, even if it is an absorber with a small mass of a core material, sufficient absorption capability can be maintained.

The above invention can include at least the following embodiments.
(1) The inner surface sheet 20 has a front surface 25 and a back surface 24, and the front surface 25 includes first and second virtual bands 75 and 76 that intersect each other, and the first and second virtual bands 75 and 76. A plurality of first pressing recesses 71 located at the intersections and a second pressing recess 72 partially overlapping one of the first and second virtual bands 75 and 76 are formed.
(2) The distance between the side edges that define the first and second virtual bands 75 and 76 is the same as the diameter of the opening when the first pressing recess 71 is circular.
(3) The inner sheet 20 is formed with a third pressing recess 73 that does not overlap the first and second virtual bands 75, 76, and the third pressing recess 73 extends from the center of the first pressing recess 71. The dimension to the center is smaller than the dimension from the center of the first pressing recess 71 to the center of the second pressing recess 72.
(4) The spacing dimension in the longitudinal direction Y of the first pressing recess 71 is made larger than the spacing dimension in the longitudinal direction Y of the recess 45 in the absorber 40 .
(5) to the surface 25 of the inner sheet 20, a groove portion 27 located between the plurality of ridge 26 and the ridge portion 26 is formed.
(6) The flange portions 26 and the groove portions 27 extend in the vertical direction Y and are alternately arranged in the horizontal direction X.
(7) The inner surface sheet 20 is positioned on both sides of the central region 28 in the lateral direction X of the central region 28 in which the flange portion 26 and the groove portion 27 are formed, and the flange portion 26 and the groove portion 27 are not formed. And both side regions 29.
(8) The area ratio of the recess 45 of the absorber 40 is 2 to 10% of the area of the absorber 40 in the crotch region 13.
(9) The density of the core material 41 in the absorber 40 is higher than the density of the other regions where the recess 45 is not provided .
(10) The core material 41 includes fluff pulp having a mass per unit area of 150 to 250 g / m ² .

Claims (11)

A skin-facing surface and a non-skin-facing surface on the opposite side, a front-rear waist region, a crotch region located between these front-rear waist regions, and an inner surface located on the skin-facing surface In a disposable wearing article comprising a sheet, an outer sheet positioned on the non-skin facing surface, and an absorber positioned between the inner and outer sheets and at least in the crotch region,
The absorber has a flat absorption surface facing the inner sheet and a bottom surface on which a plurality of recesses facing the absorption surface are formed, and the recess is located at least in the crotch region. The disposable wearing article.   The inner sheet includes first and second virtual bands that intersect with each other, a plurality of first pressing recesses that are located at intersections of the first and second virtual bands, and any one of the first and second virtual bands The disposable wearing article according to claim 1, wherein a second pressing recess is formed on a part of the second pressing recess.   The disposable wearing article according to claim 2, wherein a separation dimension of both side edges respectively defining the first and second imaginary bands is the same as a diameter of an opening of the first pressing recess when the first pressing recess is circular.   The inner sheet is provided with a third pressing recess that does not overlap the first and second imaginary bands, and the dimension from the center of the first pressing recess to the center of the third pressing recess is the first pressing The disposable wearing article of Claim 2 or 3 smaller than the dimension from the center of a recessed part to the center of a said 2nd pressing recessed part.   The disposable wearing article according to any one of claims 2 to 4, wherein a separation dimension in the longitudinal direction of the first pressing recess is made larger than a separation dimension in the longitudinal direction of the recess.   The inner surface sheet has a surface located on the skin facing surface and a flat rear surface facing the absorber, and a plurality of ridges and a groove located between the ridges are formed on the surface. The disposable wearing article according to any one of claims 1 to 5.   The disposable wearing article according to claim 6, wherein the flange portion and the groove portion extend in the longitudinal direction and are alternately arranged in the lateral direction.   The said inner surface sheet | seat contains the center area | region in which the said collar part and the said groove part were formed, and the both sides area | region which is located in the said horizontal direction both sides of the said center area | region and the said collar part and the said groove part are not formed. The disposable wearing article as described.   The disposable wearing article according to any one of claims 1 to 8, wherein an area ratio of the concave portion of the absorber is 2 to 10% of an area of the absorber in the crotch region.   The disposable wearing article according to any one of claims 1 to 9, wherein the absorbent body includes a liquid-absorbent core material, and the density of the core material is increased in the recess compared to other regions. The core material is a disposable wearing article according to any one of claims 1 to 10 mass per unit area comprising the fluff pulp of 150 to 250 g / ^{m 2.}

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