JP5777476B2 - Disposable wearing items - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a disposable wearing article, and more specifically, a disposable diaper, a disposable toilet training pant, a disposable incontinence pant, a disposable diaper having a liquid absorption structure that is relatively thin and can quickly absorb body fluid. The present invention relates to disposable wearing articles such as sanitary pants and disposable absorbent pads.

  Conventionally, disposable wearing articles having a relatively thin liquid-absorbing structure are known. For example, Patent Document 1 discloses a liquid-absorbing structure that does not include pulp fibers and includes water-absorbing polymer particles between two non-woven fiber sheets.

JP 2000-238161 A

  According to the wearing article disclosed in Patent Document 1, since the liquid absorption region that absorbs and retains body fluid is formed only from the water-absorbing polymer particles, it has the required water absorption power and is relatively thin and excellent in wearing feeling. It can be said that. Moreover, since the water-absorbing polymer particles are fixed to the opposing surface of the fiber nonwoven fabric sheet via an adhesive applied in a mesh shape, the water-absorbing polymer particles are securely held between the sheets, and the adhesive is applied to the entire opposing surface. There is no possibility that the water absorption performance of the liquid absorbing structure is lowered as compared with the case where it is applied.

  However, in this way, when the liquid absorption region is formed only from the water absorbent polymer particles, the diffusibility of the body fluid is lower than when the pulp fibers are included, and the water absorbent polymer particles absorb the body fluid and In the already swollen region, body fluid remains on the skin-facing surface of the liquid-absorbing structure for a while after excretion, which may cause discomfort to the wearer and cause skin irritation.

  Therefore, an object of the present invention is an improvement of the conventional technique, and relates to a disposable wearing article provided with a liquid-absorbing structure that is relatively thin and excellent in wearing feeling and can quickly absorb bodily fluids.

  The present invention relates to a disposable wearing article including a liquid absorbing structure that has a longitudinal direction and a transverse direction and extends in the longitudinal direction.

  In the disposable wearing article of the present invention, the liquid absorbing structure includes a liquid permeable body side liner and a liquid absorbing layer, and the liquid absorbing layer includes a liquid permeable first sheet and a liquid permeable or Including a liquid-impermeable second sheet, and water-absorbing polymer particles interposed between the first and second sheets and fixed to at least an inner surface of the first sheet. Between the side liner and the first sheet, a plurality of elastic bodies extending in the longitudinal direction are disposed in an extended state at least in the central portion of the liquid absorbing layer, and the body side liner and the first sheet are disposed. Is joined through a plurality of joints extending in the longitudinal direction and spaced apart from each other by a given dimension in the lateral direction, and the elastic body contracts to shrink the body side liner and the first sheet Are formed with a plurality of ridges extending in the lateral direction. Wherein the fluid retaining portion is defined between said first sheet and said second sheet.

  According to the disposable wearing article according to the present invention, a plurality of irregularities are formed on the body side liner and the first sheet by the contraction action of the elastic body, and the water-absorbing polymer particles are fixed to the inner surface of the first sheet. Therefore, the body fluid excreted on the body side liner is accumulated in the recess formed between the ridges and is quickly transferred to the liquid absorption layer, and the body fluid formed between the first sheet and the second sheet is retained. Can be temporarily held in the unit. The body fluid transferred to the body fluid holding part spreads in the absorption layer and is absorbed and held by the water-absorbing polymer particles.

The perspective view of the disposable diaper shown as an example of the disposable wearing article in 1st Embodiment of this invention. The partially broken perspective view of the disposable diaper similar to FIG. The partially broken expansion | deployment top view which looked at the state which peeled the side seam part of the diaper and extended in the front-back direction from the inner surface. The exploded perspective view of a diaper. The top view of a base sheet. The top view of a liquid absorption structure. The top view of the liquid absorption layer which shows the application pattern of the hot-melt-adhesive of a junction part which removed the body side liner. The partially broken top view of a liquid absorption layer. FIG. 3 is a schematic cross-sectional view taken along line IX-IX in FIG. 2. FIG. 10 is a schematic cross-sectional view similar to FIG. 9 after absorbing body fluid. The top view of the liquid absorption structure in another Example.

  As shown in FIGS. 1-4, the disposable diaper 10 shown as an example of the disposable wearing article of this invention has the vertical direction Y and the horizontal direction X orthogonal to it. The diaper 10 is attached to a skin 14 having a front waist region 11, a rear waist region 12, a crotch region 13 extending between the front and rear waist regions 11 and 12 in the longitudinal direction Y, and at least a skin facing surface of the crotch region 13. Liquid absorbing structure 15. As shown in FIG. 2, a plurality of ridges 26 extending in the lateral direction X are formed on the skin facing surface of the liquid absorbing structure 15.

  The chassis 14 includes a skin facing surface and a non-skin facing surface facing the skin, an annular elastic waist panel 16 extending in the direction around the waist, and a crotch panel 17 attached to the non-skin facing surface of the elastic waist panel 16. The elastic waist panel 16 includes a front waist panel 18 that forms the front waist region 11 and a rear waist panel 19 that forms the rear waist region 12.

  As shown in FIG. 3, the front waist panel 18 intersects the crotch panel 17 and extends in the lateral direction X, and an outer end that extends in the lateral direction X in the longitudinal direction Y so as to face and separate from the inner edge 18 a. A laterally long rectangular shape is formed by the edge 18b and both side edges 18c, 18d extending in the longitudinal direction X between the inner and outer end edges 18a, 18b.

  The rear waist panel 19 is substantially the same shape and size as the front waist panel 16, intersects the crotch panel 17, and is opposed to the inner end edge 19 a in the longitudinal direction Y and spaced apart from the inner end edge 19 a in the longitudinal direction X. The outer end edge 19b extending in the horizontal direction X and the side edges 19c, 19d extending in the vertical direction Y between the inner and outer end edges 19a, 19b are formed in a horizontally long rectangular shape.

  Both side edges 18c, 18d of the front waist panel 18 and both side edges 19c, 19d of the rear waist panel 19 are overlapped with each other and connected by a side seam portion 20 extending intermittently in the longitudinal direction Y. Leg openings 22 are defined (see FIG. 1). The side seam portion 20 is formed by a known joining means, for example, various heat welding means such as hot embossing and sonic processing.

The front waist panel 18 includes a first inner sheet 23 positioned on the skin facing surface side and a first outer sheet 24 positioned on the non-skin facing surface side. The first inner and outer sheets 23 and 24 are liquid-impermeable SMS (spunbond / meltblown / spainbond) non-woven fabric or spunbond non-woven fabric having a mass of about 15 to 30 g / m ² , or a plastic sheet or a laminate sheet thereof. And formed from. Both the sheets 23 and 24 are joined by a hot melt adhesive applied intermittently to at least one of the inner surfaces or by the heat welding means.

  Between both sheets 23 and 24, a plurality of strand-like or string-like front waist elastic bodies 25 extending in the transverse direction X are disposed. The front waist panel 18 can extend at least in the lateral direction X by the front waist elastic body 25 being disposed. In addition, both the sheets 23 and 24 may be joined together only through the hot melt adhesive applied to almost the entire periphery of the front waist elastic body 25. The front waist elastic body 25 includes a front upper waist elastic body 25A extending in the lateral direction X along the outer end edge 18b of the front waist panel 18, and a front lower waist elastic body 25B extending in the horizontal direction X along the inner end edge 18a. It consists of.

The rear waist panel 19 has a second inner sheet 28 positioned on the skin facing surface side and a second outer sheet 29 positioned on the non-skin facing surface side. The second inner and outer surface sheets 28 and 29 are liquid-impermeable SMS (spunbond / meltblown / spainbond) fiber nonwoven fabric or spunbond fiber nonwoven fabric having a mass of about 15 to 30 g / m ² , or a plastic sheet or a laminate sheet thereof. And formed from. Both sheets 28 and 29 are joined by a hot-melt adhesive applied to at least one of the inner surfaces or the above-mentioned heat welding means.

  A rear waist elastic body 30 made of a plurality of strand-like or string-like elastic bodies extending in the lateral direction X is disposed between the sheets 28 and 29. The rear waist panel 17 can extend at least in the lateral direction X by the rear waist elastic body 30 being disposed. The two sheets 28 and 29 may be joined to each other only via a hot melt adhesive applied to substantially the entire periphery of each elastic body constituting the rear waist elastic body 30. The rear waist elastic body 30 includes a rear upper waist elastic body 30A extending in the lateral direction X along the outer end edge 19b of the rear waist panel 19, and a rear lower waist elastic body 30B extending in the horizontal direction X along the inner end edge 19a. It consists of.

  The crotch panel 17 is a vertically long, substantially rectangular shape, and includes a front end portion 17A attached to the non-skin facing surface (outer surface) of the front waist panel 18 and a rear end attached to the non-skin facing surface of the rear waist panel 19. A portion 17B and an intermediate portion 17C extending in the longitudinal direction Y between the front and rear end portions 17A and 17B are provided. The crotch panel 17 includes a base sheet 34 and a liquid absorption structure 15 disposed on the skin facing surface (inner surface) of the base sheet 34. The liquid absorption structure 15 includes a liquid absorption layer 35 and a body side liner 36 that is formed of a liquid permeable sheet and covers at least the skin facing surface side of the liquid absorption layer 35. Between the body side liner 36 and the liquid absorbing layer 35, a plurality of string-like or strand-like elastic bodies 37 extending in the longitudinal direction Y are disposed as described later, and the elastic body 37 contracts. A plurality of ridges 26 extending in the lateral direction X are formed on the skin facing surface side of the liquid absorbing structure 15 (see FIG. 2). The concave / convex stripes 26 are formed by convex portions 27a and concave portions 27b alternately positioned in the vertical direction Y.

In addition, as long as there exists an effect of this invention of the postscript, the diaper 10 of this invention is comprised from the chassis 14 in which the front-and-rear waist areas 11 and 12 and the crotch area 13 were not separate bodies, but formed them integrally. It may be a thing. In that case, the liquid-absorbing structure 15 is interposed between the liquid-permeable top sheet that is located on the skin-facing surface and the liquid-impermeable back sheet that is located on the non-skin-facing surface that constitute the chassis 14. May be.
Furthermore, the disposable wearing article of the present invention may be a so-called open-type disposable diaper in which both side portions of the front and rear waist region are connected by a tape fastener, or a disposable absorbent pad extending in a rectangular shape in the front and rear waist region. There may be. Even if it has any structure, as long as it has the liquid absorption structure 15, it can say that the effect of this invention of a postscript can be show | played.

  As shown in FIG. 3, the base sheet 34 is formed by inner and outer surface crotch sheets 38 and 39 formed from a liquid-impervious fiber nonwoven fabric sheet or a plastic film. Further, the inner and outer surface crotch sheets 38 and 39 are joined to each other via a hot melt adhesive (not shown) applied to the inner surface of one of the sheets 38 and 39, and both side portions thereof. Are bent inward to form a pair of side elastic portions 40 having a gasket function extending in the vertical direction.

  Each side elastic portion 40 is provided with a plurality of strand-like or string-like first and second leg elastic bodies 41, 42 extending in the longitudinal direction Y, and is elasticized at least in the longitudinal direction Y. . The first leg elastic body 41 extends straight in the longitudinal direction Y along the inner edge of the side elastic portion 40, and the second leg elastic body 42 is bent inward at the central portion of the crotch region 13, It curves and extends toward the front and rear waist regions 11 and 12. The first and second leg elastic bodies 41, 42 are attached to both sheets 38, via a hot melt adhesive (not shown) applied to the inner surface of one of the inner and outer surface crotch sheets 38, 39. It is fixed in a state of being stretched in the longitudinal direction Y between 39.

  The crotch panel 17 is attached to the outer surfaces of the front and rear waist panels 18 and 19 in a front joint area 45 and a rear joint area 46 formed by applying hot melt adhesive to the skin facing surfaces of the front end portion 17A and the rear end portion 17B. It is done. The front and rear joining regions 45 and 46 have a concave portion opened toward the crotch region 13, and a non-joining region 50 to which no hot melt adhesive is applied is defined in the opened concave portion.

Cover sheets 51 and 52 covering the front and rear end portions 17A and 17B of the crotch panel 17 are attached. Specifically, the cover sheets 51 and 52 are formed of a fiber nonwoven fabric or a plastic sheet having a mass of about 10 to 30 g / m ² , and the front and rear waists intersect with the front and rear end portions 17A and 17B of the crotch panel 17. It fixes to the non-skin opposing surface of the panels 18 and 19 via a hot-melt-adhesive (not shown). Thus, when the front and rear end portions 17A and 17B of the crotch panel 17 are covered with the cover sheets 51 and 52, when the diaper 10 is worn, the wearer or the wear assistant can touch the front and rear waist panels 18 and 19 with fingers. There is no possibility that the fingers will be caught on the front and rear end portions 17A and 17B when they are grasped and pulled up. In addition, since the rigidity is increased by attaching the cover sheets 51 and 52, the area can be stably pulled up by grasping the area with a finger without tearing a part of the sheet member.

  FIG. 5 is a plan view of the base sheet 34, and shows the outer shape of the liquid absorbing structure 15 with phantom lines.

  As shown in FIG. 5, the liquid absorption structure 15 includes a front end portion 15a extending in the lateral direction X on the front waist region 11 side, a rear end portion 15b extending in the lateral direction X on the rear waist region 12 side, and a front and rear end portion 15a. , 15b and both side edges 15c, 15d extending in the longitudinal direction Y. Further, in the central region of the base sheet 34, a bonding region 54 for fixing the liquid absorbing structure 15 formed by applying a hot melt adhesive to the skin facing surface is formed. The joining region 54 has a continuous rectangular frame shape, and has both end portions 55A that face each other in the longitudinal direction Y and extend in the lateral direction X, and a pair of side portions 55B that extend in the longitudinal direction Y between both end portions 55A. . Further, a non-bonding area 56 is defined in a region surrounded by the bonding area 54. Therefore, the central portion of the liquid absorbing structure 15 is not fixed to the base sheet 34. As described above, in order to suppress the influence of the contraction action of the elastic body 37 on the base sheet 34, the non-bonding region 56 is formed at a portion overlapping the elastic body 37, and the liquid absorbing structure 15 is fixed to the base sheet 34 at the portion. Preferably not. As shown in the figure, the joining area 54 is slightly spaced inward from the outer peripheral edge of the liquid absorbing structure 15, but the outer shape is substantially the same in order to fix the liquid absorbing structure 15 more securely. The liquid absorbing structure 15 may have a size in contact with the outer peripheral edge. In addition, a part of the bonding area 54 may be separated.

  6 is a plan view of the liquid-absorbing structure 15, FIG. 7 is a plan view of the liquid-absorbing layer 35 showing the application pattern of the hot-melt adhesive at the joint, with the body side liner removed, and FIG. 8 is the liquid-absorbing layer. FIG. 6 and 7, the liquid absorption structure 15 and the liquid absorption layer 35 are extended in the vertical direction Y.

  As shown in FIG. 6, the elastic bodies 37 are arranged with a given dimension in the lateral direction X. Specifically, the separation dimension R (pitch, distance between the center portions of the elastic bodies) between the elastic bodies 37 adjacent in the lateral direction X is about 5 to 40 mm, preferably about 10 to 25 mm. The elastic body 37 is attached to the inner surface of the body side liner 36 in a state of being stretched in the longitudinal direction Y by about 1.1 to 2.4 times, preferably 1.2 to 1.8 times. The plurality of elastic bodies 37 may cross each other as long as the concave and convex stripes 26 are formed on the liquid absorbing structure 15, and depend on the separation dimension R, the application pattern of the hot melt adhesive, and the like. However, it may be attached so as to extend straight or curved in the lateral direction X.

The body side liner 36 is a fiber nonwoven fabric sheet having a liquid permeability of a mass of about 15 to 35 g / m ² , preferably hydrophilized, such as a spunbond fiber nonwoven fabric, a point bond fiber nonwoven fabric, and an air-through nonwoven fabric. It can be formed from various known fiber nonwoven fabrics.

  As shown in FIG. 7, the body-side liner 36 has a liquid-absorbing layer 35 (first sheet described later) through a joint portion 59 formed by continuously applying a hot melt adhesive in the longitudinal direction Y in a spiral shape. 61). The joint portion 59 is formed in almost the entire area of the first sheet 61 of the liquid absorption layer 35. An elastic body 37 is disposed between the joint portions 59 adjacent in the lateral direction X. The elastic body 37 is fixed to at least the liquid absorbing layer 35 of the body side liner 36 and the liquid absorbing layer 35 via a hot melt adhesive (not shown) applied to the substantially peripheral edge thereof.

  The projections and recesses 26 formed on the liquid absorption structure 15 are elastic bodies that are separated from each other in the lateral direction X between the joints 59 and in the spaced part of the arc-shaped coating pattern continuous in the longitudinal direction Y of each joint 59. It is considered that the contraction force of 37 acts to form a plurality of wrinkles, which are formed by extending in the lateral direction X. Therefore, the convex part 27a and the concave part 27b which form the uneven | corrugated strip 26 are intermittent and deform | transformed irregularly. In order to form an uneven stripe 26 having a required size that can produce the effects described later, the former separation dimension R2 is preferably about 5 to 20 mm, and the latter separation dimension R3 is preferably 3 to 25 mm.

As shown in FIG. 8, the liquid-absorbing layer 35 is composed of an absorptive core mainly formed from so-called water-absorbing polymer particles 60 that are insoluble in water and have a water-absorbing power 10 times or more of the self-mass, and a mass located on the skin facing surface side. About 8.0 to 15.0 g / m ² , and preferably a first sheet (upper sheet) 61 formed from a liquid-permeable non-woven fabric having a mass of about 10.0 g / m ² , and a non-skin facing surface side A second sheet (bottom surface) formed from a liquid-permeable or hardly water-permeable or liquid-impermeable SMS fiber nonwoven fabric having a mass of about 8.0 to 15.0 g / m ² , preferably 11.0 g / m ^2. Sheet) 62.

  The liquid-absorbing layer 35 further includes a plurality of liquid-absorbing areas 63 that are defined in a substantially rectangular shape with a given dimension in the longitudinal direction Y, in which the absorbent core is disposed, and the absorbent core is substantially disposed. And a non-liquid-absorbing area 64 formed so as to surround the liquid-absorbing area 63. In the present embodiment, the liquid absorption area 63 is divided into eight areas, but the area and the number of areas can be appropriately changed according to the absorption performance required by the liquid absorption layer 35, for example, 8 It may be divided into two or more areas, or may be formed of only a single area extending over the entire liquid absorption layer 35.

In the liquid absorption region 63, water-absorbing polymer particles 60 having a mass of about 30 to 300 g / m ² , preferably a mass of about 40 to 280 g / m ² are interposed on the inner surface of the first sheet 61 via a hot melt adhesive 66. It is fixed almost uniformly. When the mass per unit area of the water-absorbing polymer particles 60 is about 30 g / m ² or less, the absorption performance of the absorption layer 35 is low and the body fluid cannot be sufficiently absorbed. On the other hand, in the case where the mass per unit area is 300 g / m ² or more, the absorbent polymer particles 60 that are not fixed to the inner surface of the first sheet 61 are contained in the body fluid holding unit 65 described later in the liquid absorbing layer 35. There is a possibility that the absorption speed of the liquid-absorbing layer 35 is lowered and the distribution of the water-absorbing polymer particles 60 is biased and the liquid-absorbing layer 35 may be deformed. However, even if the mass per unit area is within the predetermined range, the water-absorbing polymer particles 60 that are not fixed to the first sheet 61 and are not fixed to the second sheet 62 are contained in the liquid absorbing layer 35. It is slightly present inside and is located on the second sheet 62.

  In order to adjust the absorption rate of the entire liquid-absorbing layer 35, for example, two types of water-absorbing polymer particles 60 having different absorption rates can be used in combination. In addition, as long as the effects of the present invention described later are exhibited, the absorbent core includes not only the water-absorbing polymer particles 60 but also known materials such as fluff pulp and optional thermoplastic staple fibers at a relatively low mixing rate. It may be included in part. Specifically, when water-absorbing fibers such as fluff pulp are mixed, it is preferably mixed at a ratio of about 0 to 30% by weight with respect to the entire absorbent core. Various known materials can be used as the hot-melt adhesive 66, but it has hydrophobicity so that the water-absorbing polymer particles 60 do not peel from the first sheet 61 before absorbing body fluid. It is preferable to use an adhesive.

  In the liquid absorption area 63, it is preferable that the first sheet 61 and the second sheet 62 are partially fixed or they are not fixed to each other. When the first and second sheets 61 and 62 are partially fixed to each other by the hot melt adhesive 66 in the liquid absorption region 63, the body fluid that has moved into the liquid absorption layer 35 is absorbed by the water-absorbing raw polymer particles 60. The two sheets 61 and 62 may be unfixed by being absorbed by the resin and swelling. On the other hand, in the non-liquid-absorbing region 64, that is, in the separated portion between the liquid-absorbing regions 63 and the entire region along the outer peripheral edge of the liquid-absorbing layer 35, the first and second sheets 61 and 62 are interposed via the hot melt adhesive 66. Are joined together. In the liquid absorption region 63, the hot melt adhesive 66 is applied relatively loosely in order to fix the water absorbent polymer particles 60 to the inner surface of the first sheet 61, and in the non-liquid absorption region 64, It is applied relatively densely. That is, the hot melt adhesive 66 is applied in the liquid absorption area 63 to such an extent that does not impede the permeation of body fluid. On the other hand, in the non-liquid absorption area 64, the liquid absorption area 63 is swollen by absorbing body fluid. However, the hot melt adhesive 66 is densely applied to such an extent that the fixation is not easily released.

  Thus, since the absorptive core of the liquid absorption layer 35 contains 70% by mass or more of water-absorbing polymer particles, it consists of a mixture in which the water-absorbing polymer particles 60 and fluff pulp are mixed in substantially the same ratio. Compared to the case, the entire liquid absorbing layer 35 is thin, and the liquid absorbing structure 15 is excellent in adaptability to the movement of the crotch panel 17. In addition, the first and second sheets 61 and 62 are stably fixed in the non-liquid-absorbing region 64 to have a required peel strength, and the entire inner surfaces of the first and second sheets 61 and 62 are fixed. It can be said that it has high flexibility compared with the case where it is. Furthermore, since the water-absorbing polymer particles 60 are uniformly fixed to the first sheet 61 in the liquid absorption region 63, the distribution is not biased regardless of the movement and posture of the wearer. The non-liquid-absorbing area 64 can serve as a seal portion that seals the periphery of the liquid-absorbing area 63 in order to prevent the water-absorbing polymer particles 60 that can move from the liquid-absorbing area 63 from spilling out. In the manufacturing process, a part of the water-absorbing polymer particles 60 may be disposed in the non-liquid-absorbing region 64 in a range smaller than the required mass per unit area of the water-absorbing polymer particles 60 in the liquid-absorbing region 63. .

  FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 2, and FIG. 10 is a schematic cross-sectional view similar to FIG. 9 after absorbing body fluid.

  As shown in FIG. 9, the body side liner 36 and the first sheet 61 fixed to the body side liner 36 via the adhesive portion 59 are undulated in the liquid absorption region 63 by the contraction action of the elastic body 37, The portions 27a and the concave portions 27b are alternately formed in the vertical direction Y. In each liquid absorption area 63 divided by the non-liquid absorption area 64, the water-absorbing polymer particles 60 are fixed to the inner surface of the first sheet 61, and the first sheet 61, the body side liner 36, Is convex upward, a body fluid holding part 65 is formed in the space between the first sheet 61 and the second sheet 62. In general, the water-absorbing polymer particles 60 have a water absorption amount several times or more than their own weight, but the diffusibility of body fluids is lower than that of the water-absorbing fibers, the absorption layer 35 is formed only from the water-absorbing polymer particles 60, and When the entire liquid absorption region 63 is filled, only the water-absorbing polymer particles 60 at the site where the bodily fluid is excreted absorb the bodily fluid and are difficult to diffuse to other sites. Interstitial fluid may remain on the surface of the body side liner 36, causing discomfort to the wearer and causing skin irritation. However, according to the liquid absorption structure 15 according to the present invention, such problems can be solved by having the following configuration and operation.

  First, the bodily fluid excreted in the liquid absorption region 63 accumulates in the concave portion 27b, and quickly moves downward due to its own weight, that is, the inside of the liquid absorption layer 35. Therefore, the body side liner 36 does not have an undulating shape. As compared with the above, the absorption rate of body fluid can be increased. Moreover, since the non-liquid-absorbing region 64 is formed between the liquid-absorbing regions 63 having a predetermined thickness in the liquid-absorbing layer 35, the body fluid excreted not only in the recess 27b but also in the non-liquid-absorbing region 64 is collected. However, since the water-absorbing polymer particles 60 are fixed to a part of the liquid absorption region 63 located on both sides of the concave portion 27b and the non-liquid absorption region 64, the body fluid accumulated in them is moved downward. Occurs and body fluid can be absorbed more quickly.

  In addition, as shown in FIG. 2, while the diaper 10 is worn, the liquid absorbing structure 15 has a curved shape, and the body fluid accumulated in the concave portion 27b on the front and rear waist regions 11 and 12 side is downward, that is, Although it tends to flow toward the central portion of the crotch region 13, the bodily fluid is excessively collected in the central portion of the crotch region 13 because it is dammed up by the convex portions 27 a adjacent in the longitudinal direction Y, and the body fluid collected from the leg opening edge There is no risk of leaking sideways. Note that, in the liquid absorption region 63, the first and second ridges 26 are formed on the first sheet 61, whereby a force is applied to the second sheet 62 to bend outward (downward in FIG. 9). However, as described above, in the worn state, the entire liquid absorbing structure 15 has a shape curved in the longitudinal direction Y, and thus has a shape substantially parallel to the base sheet 34.

  Next, the bodily fluid that has passed through the body side liner 36 and the first sheet 61 moves to the bodily fluid holding part 65 formed in the space between the first sheet 61 and the second sheet 62. The body fluid transferred to the body fluid holding part 65 spreads in the liquid absorption region 63 and is absorbed and retained by the water absorbent polymer particles 60 in the liquid absorption region 63.

  In this way, the body liner 36 and the top sheet 61 are undulated using the contraction action of the elastic body 37 to form the convex portions 27a and the concave portions 27b, and the body fluid accumulated in the concave portions 27b and the non-liquid-absorbing region 64 is removed. The body fluid is quickly transferred to the body fluid holding unit 65 and temporarily held, and is expanded in the liquid absorption region 63 to absorb and retain the body fluid in the entire water absorbent polymer particle 60 in the liquid absorption region 63 instead of locally. be able to. As a result, the absorption performance of the entire absorbent core is improved, and the body fluid does not remain on the surface of the body liner 36 for a relatively long time, causing the wearer to feel uncomfortable for a long time and causing skin problems such as rash. There is no cause. In addition, it can be said that the same effect can be obtained also by using a sheet having an undulating shape in advance as the body side liner 36, but by causing the elastic body 37 to undulate by a contraction action, the body pressure of the wearer can also be obtained. A more stable relief shape that does not collapse the shape can be imparted to the body side liner 36. Moreover, as long as there exists such an effect, the liquid absorption layer 35 does not need to be divided into the some liquid absorption area | region 63. FIG. However, in the case where the liquid absorption area 63 is divided, the liquid absorption layer 35 has only a single liquid absorption area 63 extending in its entirety. It can be said that the body fluid spreads quickly and can absorb the body fluid more quickly.

  As described above, the liquid-absorbing structure 15 is fixed to the base sheet 34 by the joining region 54 having a square frame shape, and the central portion thereof faces the central non-joining region 56 and is not fixed to the base sheet 34. Therefore, even when the liquid absorbing layer 35 has a relatively small thickness dimension and has a shape that undulates due to the contracting action of the elastic body 37, the base sheet 34 exerts its influence. There is no risk of wrinkles occurring and damage the appearance.

  In order to achieve the effect of the present invention, the height dimension of the convex part 27a (the distance dimension from the extreme end part 70 of the convex part 27a to the bottom part 71 of the concave part 27b) H is preferably 2.5 to 15 mm. . In the case of 2.5 mm or less, the convex portion 27a is relatively small, and a sufficiently large body fluid holding portion 65 cannot be formed, while in the case of 15 mm or more, the convex portion is relatively When 27a becomes high and it touches a wearer's skin, there exists a possibility of giving a wearer an uncomfortable feeling.

<Measurement method of separation dimension H>
By using a metal bar-shaped measuring element having a rectangular cross section (cross sectional dimension: 1 mm × 1 mm), the ridges 26 in the region sandwiched between the plurality of elastic bodies 37 of the liquid absorbing structure 15 or in the region surrounded by them are formed. In the formed portion, the height dimension of the reference line when the tip of the probe touches the extreme end portion 70 of the convex portion 27a and the bottom portion 71 of the concave portion 27b is compared to determine the difference (mm), and the average value Let (n = 10) be the separation dimension H. Normally, when measuring the thickness of the sheet member, the measurement is performed by pressing the measuring element with a predetermined pressure. When the measuring element is pressed against the convex portion 27a with the predetermined pressure, the sheet member collapses and can be measured accurately. Accordingly, the height dimension of the reference line when contacting the extreme end portion 70 of the convex portion 27a and the bottom portion 71 of the concave portion 27b without applying pressure is obtained by comparison.

  As shown in FIG. 10, after the water-absorbing polymer particles 60 have absorbed the body fluid, the body fluid holding portion 65 is filled with the water-absorbing polymer particles 60 by swelling. Specifically, in each liquid absorption region 63, the hot melt adhesive 66, which is a joint surface between the water absorbent polymer particles 60 and the first sheet 61, is moistened by permeation of body fluid, and the adhesive force is reduced. The water-absorbing polymer particles 60 are peeled off from the inner surface of the first sheet 61 and are positioned on the second sheet 62. Thus, even when the water-absorbing polymer particles 60 are located on the second sheet 62, the water-absorbing polymer particles 60 swell and are close to the recesses 27b, so that the body fluid that has flowed into the liquid-absorbing layer 35 again. Can be absorbed quickly. Further, when the bodily fluid is absorbed until the water-absorbing polymer particles 60 are saturated, a gel is formed to form a block, so that the bodily fluid that is not absorbed by the water-absorbing polymer particles 60 accumulated in the bodily fluid holding portion 65 is worn by the wearer. It becomes difficult to go back to the body side. In order to achieve such an effect, it is preferable to adjust the particle size and the like of the water-absorbing polymer particles 60 included in the liquid absorption region 63.

  FIG. 11 is a plan view of the liquid absorption structure 15 in another embodiment. For convenience of explanation, the liquid absorption region 63 of the liquid absorption layer 35 and the elastic body 37 are indicated by phantom lines.

  In the present embodiment, four liquid absorption regions 63 are arranged in a row in the vertical direction Y, and two rows are arranged in the horizontal direction X, and the elastic body 37 is only in the central portion of the liquid absorption structure 15. It is arranged. Thus, the elastic body 37 is not disposed in the entire liquid absorbing structure 15, but is disposed only in the central portion where the body fluid is most excreted, thereby forming the ridges 26 only in the central portion, The body fluid accumulated in the recess 27b and the non-liquid absorbing area 64 can be quickly transferred to the liquid absorbing layer 35.

  In addition to the materials described in the present specification, various known materials that are usually used in this type of article can be used without limitation for the respective constituent members constituting the diaper 10. In the specification of the invention and the claims, the terms “first” and “second” are used merely to distinguish similar elements, positions, and the like.

  The disclosure relating to the present invention described above can be summarized at least as follows.

  A disposable wearing article having a longitudinal direction and a transverse direction and including a liquid absorbing structure extending in the vertical direction, the liquid absorbing structure having a liquid-permeable body side liner and a liquid absorbing layer, The layer is interposed between the liquid-permeable first sheet, the liquid-permeable or liquid-impervious second sheet, the first and second sheets, and at least of the first sheet of both sheets. And water-absorbing polymer particles fixed to the inner surface. Between the body side liner and the first sheet, a plurality of elastic bodies extending in the vertical direction at least in the central portion of the liquid absorption layer are disposed in an extended state, and the body side liner and the first sheet are arranged vertically. A plurality of concave and convex strips that extend in the lateral direction and extend in the lateral direction to the body side liner and the first sheet by being contracted by the elastic body. And a body fluid holding part is defined between the first sheet and the second sheet.

The present invention disclosed in the above paragraph 0053 can include at least the following embodiments.
(1) The liquid absorbing layer includes a non-liquid absorbing area where the first sheet and the second sheet are joined to each other, and a plurality of liquid absorbing areas surrounded by the non-liquid absorbing area and encapsulating water-absorbing polymer particles. And further including.
(2) It further includes a chassis that forms a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions, and a joint for fixing the liquid absorbing structure to the crotch region of the chassis. A region is formed, and a non-joined region is defined in at least a portion of the central portion of the joined region that overlaps the elastic body.
(3) The elastic bodies are arranged in a state of being stretched about 1.2 to 2.4 times in the vertical direction, and the spacing between the adjacent elastic bodies in the horizontal direction is about 5 to 40 mm.
(4) The uneven strip has a plurality of convex portions and a plurality of concave portions that are alternately positioned in the vertical direction, and the distance between the extreme end portion of the convex portion and the bottom portion of the concave portion is about 2.5 to 15 mm.
(5) Water-absorbing polymer particles having a mass of about 30 to 300 g / m ² are fixed to the inner surface of the first sheet.
(6) The water-absorbing polymer particles are fixed to the inner surface of the first sheet via a hydrophobic hot melt adhesive.
(7) The liquid absorption region includes an absorbent core formed from a mixture of water absorbent polymer particles and water absorbent fibers, and the mixing ratio of the water absorbent fibers is 30% or less.

10 Disposable wearing articles (disposable diapers)
DESCRIPTION OF SYMBOLS 11 Front waist area 12 Rear waist area 13 Crotch area 14 Chassis 15 Liquid absorption structure 26 Concavity and convexity 27a Convex part 27b Concavity 35 Liquid absorption layer 36 Body side liner 37 Elastic body 54 Joining area 56 Non-joining area 59 Joining part 60 Water absorption Polymer particle 61 first sheet (upper sheet)
62 Second sheet (lower sheet)
63 Liquid-absorbing area 64 Non-liquid-absorbing area 65 Body fluid holding part 66 Hot melt adhesive 70 The extreme end part 71 of the convex part The bottom part H of the convex part The separation dimension X between the extreme end part of the convex part and the bottom part of the concave part X Horizontal direction Y Vertical direction R Distance between adjacent elastic bodies in the lateral direction

Claims (8)

A disposable wearing article comprising a liquid-absorbing structure having a longitudinal direction and a transverse direction and extending in the longitudinal direction,
The liquid absorbing structure has a liquid-permeable body side liner and a liquid absorbing layer,
The liquid-absorbing layer is interposed between a liquid-permeable first sheet, a liquid-permeable or liquid-impervious second sheet, the first and second sheets, and at least the first of both sheets A plurality of elastic bodies including water-absorbing polymer particles fixed to an inner surface of the first sheet, and extending in the longitudinal direction at least in a central portion of the liquid-absorbing layer between the body-side liner and the first sheet. Is arranged in an extended state,
The body side liner and the first sheet are joined via a plurality of joints extending in the longitudinal direction and spaced apart from each other by a given dimension in the lateral direction,
When the elastic body contracts, the body side liner and the first sheet are formed with a plurality of uneven strips extending in the lateral direction, and a body fluid holding portion is defined between the first sheet and the second sheet. The said wearing article characterized by the above-mentioned.   The liquid-absorbing layer includes a non-liquid-absorbing region in which the first sheet and the second sheet are joined to each other, and a plurality of water-absorbing polymer particles surrounded by the non-liquid-absorbing region. The wearing article according to claim 1, further comprising a liquid region.   It further includes a chassis that forms a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions, and a joining region for fixing the liquid absorbing structure to the crotch region of the chassis The wearing article according to claim 1 or 2, wherein a non-joining area is defined at least in a portion of the central part of the joining area that overlaps the elastic body.   The elastic bodies are arranged in a state of being stretched by about 1.2 to 2.4 times in the longitudinal direction, and the spacing between the adjacent elastic bodies in the lateral direction is about 5 to 40 mm. The wearing article according to any one of claims 1 to 3.   The uneven strip has a plurality of convex portions and a plurality of concave portions that are alternately positioned in the longitudinal direction, and a separation dimension between the extreme end portion of the convex portion and the bottom portion of the concave portion is about 2.5 to 15 mm. The wearing article in any one of Claims 1-4. Wherein the inner surface of the first sheet, wearing article according to claim 1, wherein the water-absorbing polymer particles of the mass about 30~300g / m ² are fixed.   The wearing article according to any one of claims 1 to 6, wherein the water-absorbing polymer particles are fixed to an inner surface of the first sheet via a hydrophobic hot melt adhesive. The wearing article according to claim 2 , wherein the liquid absorption region includes an absorbent core formed from a mixture of the water absorbent polymer particles and water absorbent fibers, and a mixing ratio of the water absorbent fibers is 30% or less.

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