Absorbent article

Abstract

To provide an absorbent article improving a shape retaining property of an absorber and preventing superabsorbent polymer particles from slipping out.SOLUTION: An absorbent article comprises an absorption element 50 including an absorber 56 and a packaging nonwoven fabric 58 for packaging the absorber 56. The absorber 56 has a layer formed by mixing and accumulating pulp fibers and superabsorbent polymer particles. The packaging nonwoven fabric 58 has a melt-blown layer formed of fibers with an average fiber diameter of 5 μm or less, and air permeability of 5-ply nonwoven fabric measured according to JIS L 1096: 2010 A method (Frazier shape method) is 25.5-70.0 cm3 / cm2 s. The absorption element 50 includes compression parts 51 compressed in a thickness direction so as to dent from a back side of the absorption element 50 to the inside of the absorber 56, provided at intervals, while the absorption element 50 includes no compression parts 51 compressed in the thickness direction so as to dent from the surface of the absorption element 50 to the inside of the absorber 56.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to absorbent articles such as disposable diapers.

Background Art

[0002] In absorbent articles, it is common to use an absorber formed by mixing and integrating pulp fibers and superabsorbent polymer particles. In order to enhance the shape retention during and after manufacturing of such an absorber, it is generally incorporated as an absorbent element wrapped with a packaging sheet made of crepe paper or the like (see, for example, Patent Documents 1 and 2).

[0003] The absorbent element of an absorbent article is sandwiched between both legs and receives forces from various directions from both sides in the width direction due to leg movements such as walking. Therefore, good fit in the crotch area is required, while shape retention for preventing deformation of the absorber such as sagging or cracking is also required. Of course, for the absorbent element of a disposable diaper, ensuring absorption performance in the crotch area is also demanded.

[0004] As a method for improving the shape retention of the absorber, it is known to provide a compressed portion obtained by compressing the absorbent element in the thickness direction by embossing or the like in a pattern such as a lattice (see, for example, Patent Documents 1 and 2). However, if the packaging sheet wrapping the absorber is crepe paper, the crepe paper may tear at the edge of the compressed portion or between adjacent compressed portions when forming the compressed portion. Also, crepe paper has reduced strength in a wet state after absorbing excreted liquid and is prone to tearing. If the packaging sheet tears, superabsorbent polymer particles may escape from there and reach the surface of the absorbent article, which is not preferable.

[0005] It is also known to use a fine-mesh nonwoven fabric as the packaging sheet. Since the nonwoven fabric is not easily torn even when wet, it was expected to effectively prevent the escape of superabsorbent polymer particles. However, even when the packaging sheet is a nonwoven fabric, it has been confirmed that superabsorbent polymer particles escape more than expected.

Prior Art Documents

Patent Document

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, the main problem of the present invention is to make it difficult for superabsorbent polymer particles to reach the surface of the absorbent article while improving the shape retention of the absorber.

Means for Solving the Problems

[0008] As a result of intensive research, the present inventor has found that when the packaging sheet is a non-woven fabric, the fiber gaps become larger due to the elongation of the non-woven fabric at the edges of the compressed portion or between adjacent compressed portions when forming the compressed portion, and superabsorbent polymer particles are likely to escape therefrom. The absorbent article described below is based on this finding. <First Aspect> It has a crotch portion, and a front portion and a rear portion extending forward and backward from the crotch portion, respectively, An absorbent element having an absorber provided in the front-rear direction range including the crotch portion, and a packaging non-woven fabric wrapping the absorber, The absorber has a layer formed by mixing and integrating pulp fibers and superabsorbent polymer particles, The packaging non-woven fabric has a meltblown layer formed of fibers having an average fiber diameter of 5 μm or less, and has an air permeability of 25.5 to 70.0 cm 3 / cm 2 ·s as measured in accordance with Method A (Frazee method) according to JIS L 1096:2010 in a five-layer stacked state, In the absorbent element, compressed portions compressed in the thickness direction so as to be recessed from the back surface of the absorbent element into the absorber are provided at intervals, The absorbent element is not provided with a compressed portion that is compressed in the thickness direction so as to be recessed from the surface of the absorbent element into the absorbent body. An absorbent article characterized by this.

[0009] (Function and effect) The features of this absorbent article are (a) By using a nonwoven fabric having a dense meltblown layer as the packaging material of the absorbent body, the problems (such as tearing during manufacturing and use) when using crepe paper are solved. (b) By providing a compressed portion that is recessed from the back surface of the absorbent element into the absorbent body, the shape maintainability of the absorbent body and the like are improved, and (c) By not providing a compressed portion that is recessed from the surface of the absorbent element into the absorbent body, the fiber gaps in the portion (surface portion) of the packaging nonwoven fabric that covers the surface of the absorbent element are not widened, and the superabsorbent polymer particles contained in the absorbent body are prevented from passing through Non-woven fabric the surface portion of the packaging and are maintained in a state where they are difficult to pass through. That is. Therefore, while improving the shape maintainability of the absorbent body and the like by providing a compressed portion as in the prior art, the escape of superabsorbent polymer particles, which is a problem at that time, can be effectively suppressed. Note that air permeability is also an index of the ease of escape of superabsorbent polymer particles.

[0010] <Second aspect> The packaging nonwoven fabric has one or more layers of the meltblown layer and one or more layers of the protective layer, The constituent fibers of the protective layer are fibers having an average fiber diameter of 10 to 25 μm, The packaging nonwoven fabric has an elongation rate at standard time as defined in JIS L 1913:2010 of 20 to 100% in the front-rear direction, and an elongation rate at standard time as defined in JIS L 1913:2010 of 20 to 110% in the width direction. The absorbent article of the first aspect.

[0011] (Function and effect) If the packaging non-woven fabric is not easily stretchable, it becomes difficult to form a firm compression part (that is, it becomes difficult to improve the shape retention), and the flexibility of the absorber also decreases. Therefore, it is preferable that the packaging non-woven fabric is sufficiently thin and easily stretchable as in this embodiment. Moreover, although such a non-woven fabric tends to have larger fiber gaps due to the formation of the compression part, by having the characteristics (a) to (c) described above, it is possible to achieve both an improvement in the shape retention and flexibility of the absorber and suppression of the escape of the superabsorbent polymer particles.

[0012] <The third embodiment> The basis weight of the pulp fibers in the absorber is 100 to 450 g / m 2 and the ratio of pulp fibers to superabsorbent polymer particles in the absorber is 30:70 to 70:30 by weight, the maximum value of the thickness of the absorption element is 4 to 35 mm, the thickness of the compression part is 15 to 35% of the maximum value of the thickness of the absorption element, An absorbent article according to the first or second embodiment.

[0013] (Function and effect) The material composition of the absorber and the degree of compression of the compression part can be appropriately determined, but it is preferable to be within the range of this embodiment.

[0014] <The fourth embodiment> The width of the compression part is 1 to 3 mm, the compression part is formed in a diagonal lattice shape consisting of a first part inclined 40 to 50° clockwise in plan view with respect to the front-rear direction and a second part inclined 40 to 50° counterclockwise in plan view with respect to the front-rear direction, An absorbent article according to the third embodiment.

[0015] (Function and effect) The dimensions and shape of the compression part can be determined as appropriate. However, if it is formed in a diagonal lattice pattern as in this embodiment, it is preferable because it is excellent not only in the shape maintainability and flexibility of the absorber but also in the liquid diffusibility. However, when forming the compression part in the pattern of this embodiment, since the packaging nonwoven fabric is particularly likely to stretch, it is particularly important to have the characteristics of (a) to (c) described above.

[0016] <Fifth Aspect> The absorber has a coating layer in which only pulp fibers covering the surface of the absorber are accumulated. An absorbent article according to any one of the first to fourth aspects.

[0017] (Function and Effect) Having a coating layer as in this embodiment is preferable because it becomes difficult for the superabsorbent polymer particles to escape from the surface of the absorber.

[0018] <Sixth Aspect> The packaging nonwoven fabric has a surface portion located on the front side of the absorber, a portion continuing from the surface portion, a first back side portion that wraps around one side edge of the absorber and reaches the back side of the absorber, and a portion continuing from the surface portion, a second back side portion that wraps around the other side edge of the absorber and reaches the back side of the absorber. The first back side portion and the second back side portion have a laminated portion that overlaps with each other. All of the compression parts are formed in the laminated portion. An absorbent article according to any one of the first to fifth aspects.

[0019] (Function and Effect) If configured as in this embodiment, it is possible to suppress the escape of the superabsorbent polymer particles from the back surface of the absorbent element.

[0020] <Seventh Aspect> Among the absorbent elements, the intermediate portion excluding both end portions in the width direction is not covered by other members over the entire front-rear direction, and the packaging nonwoven fabric is exposed on the surface of the absorbent article. An absorbent article according to any one of the first to sixth aspects.

[0021] (Function and Effect) Since it is possible to suppress the escape of the superabsorbent polymer particles through the packaging nonwoven fabric as described above, it is possible to omit members such as the topsheet that covers the surface of the absorbent element, which are provided in conventional absorbent articles. In that case, significant cost reduction can be achieved.

[0022] <Eighth Aspect> having a liquid-impermeable sheet adhesively bonded to the back surface of the absorbent element via a hot melt adhesive, the liquid-impermeable sheet extends from in front of the front edge of the absorbent element to behind the rear edge of the absorbent element, and from the left side of the left edge of the absorbent element to the right side of the right edge of the absorbent element, the hot melt adhesive is applied from in front of the front edge of the absorbent body to behind the rear edge of the absorbent body, and from between the left edge of the absorbent body and the left edge of the absorbent element to between the right edge of the absorbent body and the right edge of the absorbent element, An absorbent article according to any one of the first to seventh aspects.

[0023] (Function and Effect) By applying a hot melt adhesive for adhering the back surface of the absorbent element over the range of this aspect, it is possible to effectively suppress the escape of the superabsorbent polymer particles from the back surface of the absorbent element while suppressing a decrease in the flexibility of both side edges of the absorbent element. [Advantages of the Invention]

[0024] According to the present invention, advantages such as improving the shape maintainability of the absorbent body and making it difficult for the superabsorbent polymer particles to reach the surface of the absorbent article are brought about. [Brief Description of the Drawings]

[0025]

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Best Mode for Carrying Out the Invention

[0026] Hereinafter, as an example of a disposable diaper, a pants-type disposable diaper will be described in detail with reference to the accompanying drawings. Each constituent member adjacent in the thickness direction is fixed or joined in the same manner as a known diaper as necessary, except for the fixing or joining portions described below. The dotted pattern portion in the cross-sectional view indicates an adhesive such as a hot melt adhesive as this fixing or joining means. The hot melt adhesive can be applied by known methods such as slot coating, continuous linear or dotted bead coating, spray coating in a spiral, Z-shaped, wavy, or other shape, or pattern coating (transfer of hot melt adhesive in a relief printing method). Instead of or together with this, at the fixing portion of the elastic member, the hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. As the hot melt adhesive, there are, for example, types such as EVA-based, pressure-sensitive rubber-based (elastomer-based), polyolefin-based, polyester-polyamide-based, etc., and it can be used without particular limitation. As the fixing or joining means for joining each constituent member, means such as heat sealing or ultrasonic sealing by material welding can also be used. In a portion where liquid permeability in the thickness direction is required, the constituent members adjacent in the thickness direction are fixed or joined in an intermittent pattern. For example, when performing such intermittent fixing or joining with a hot melt adhesive, intermittent pattern coating in a spiral, Z-shaped, wavy, or other shape can be preferably used. When applying in a range wider than the coating width by one nozzle, intermittent pattern coating in a spiral, Z-shaped, wavy, or other shape can be performed with or without spacing in the width direction. As the joining means for joining each constituent member, means such as heat sealing or ultrasonic sealing by material welding can also be used.

[0027] In addition, as the nonwoven fabric in the following description, known nonwoven fabrics can be appropriately used according to the part and purpose. As the constituent fibers of the nonwoven fabric, for example, synthetic fibers such as polyolefins such as polyethylene or polypropylene, polyesters, polyamides, etc. (including composite fibers such as core-sheath in addition to single-component fibers), regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc. can be selected without particular limitation, and these can also be used in combination. In order to enhance the flexibility of the nonwoven fabric, it is preferable that the constituent fibers are crimped fibers. Also, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers made hydrophilic by a hydrophilic agent), hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by a water-repellent agent). In addition, nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punch nonwoven fabrics, point bond nonwoven fabrics, laminated nonwoven fabrics (including SMS nonwoven fabrics, SMMS nonwoven fabrics, etc. with a meltblown layer sandwiched between spunbond layers) etc. according to the fiber length, sheet forming method, fiber bonding method, and laminated structure, but any of these nonwoven fabrics can be used.

[0028] Figs. 1 to 6 show an example of a pant-type disposable diaper. This pant-type disposable diaper includes a rectangular front outer body 12F that constitutes the front torso circumference portion and a rectangular rear outer body 12B that constitutes the rear torso circumference portion, and an inner body 200 provided inside the outer bodies 12F and 12B so as to extend from the front outer body 12F through the crotch portion M to the rear outer body 12B. Both side portions of the front outer body 12F and both side portions of the rear outer body 12B are joined to form a side seal 12A. As a result, the opening formed by the front and rear end portions of the outer bodies 12F and 12B becomes a waist opening WO through which the wearer's torso passes, and portions surrounded by the lower edges of the outer bodies 12F and 12B and the side edges of the inner body 200 on both sides in the width direction of the inner body 200 become leg openings LO through which the legs pass. The inner body 200 is a portion for absorbing and holding excreta such as urine, and the outer bodies 12F and 12B are portions for supporting the inner body 200 with respect to the wearer's body. Further, the symbol Y indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the rear body B), and the symbol X indicates the total width of the diaper in the unfolded state.

[0029] This pant-type disposable diaper has a body circumference region T defined as a front-back direction range having a side seal 12A (the front-back direction range from the waist opening WO to the upper end of the leg opening LO), and an intermediate region L defined as a front-back direction range of the portion forming the leg opening LO (between the front-back direction region having the side seal 12A of the front body panel F and the front-back direction region having the side seal 12A of the back body panel B). The portions of the front outer body 12F and the back outer body 12B located in the body circumference region T, that is, the front body circumference portion and the back body circumference portion, can conceptually be divided into a "waist portion" W that forms the edge of the waist opening and a "lower waist portion" U that is the portion below this. Usually, when there is a boundary (for example, where the thickness or elongation rate of the elastic member changes) within the front body circumference portion and the back body circumference portion where the expansion and contraction stress in the width direction WD changes, the side closer to the waist opening WO than the boundary closest to the waist opening WO becomes the waist portion W, and when there is no such boundary, the waist extension portion 12E extending beyond the absorber 56 or the interior body 200 toward the waist opening WO becomes the waist portion W. These front-back lengths vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W can be 15 to 40 mm, and the lower waist portion U can be 65 to 120 mm. On the other hand, the both side edges of the intermediate region L are pinched in a U-shape or a curved shape along the wearer's leg circumference, and this is the part where the wearer inserts their legs. As a result, the pant-type disposable diaper in the unfolded state has a generally hourglass shape as a whole.

[0030] (Interior body) The interior body 200 can take any shape, but in the illustrated example, it is rectangular. As shown in FIGS. 3 to 5, the interior body 200 includes a topsheet 30 on the body side, a liquid-impermeable sheet 11, and an absorption element 50 interposed therebetween, and is the main body portion that performs the absorption function. Reference numeral 40 indicates an intermediate sheet (second sheet) provided between the topsheet 30 and the absorption element 50 to quickly transfer the liquid that has passed through the topsheet 30 to the absorption element 50, and reference numeral 60 indicates a raised gather 60 that extends from both side portions of the interior body 200 to contact the wearer's leg circumference to prevent excrement from leaking from both sides of the interior body 200.

[0031] (Top sheet) The top sheet 30 has the property of permeating liquid, and examples thereof include a porous or non-porous non-woven fabric, a porous plastic sheet, etc. Also, the top sheet 30 may be composed of a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of a single sheet or two or more sheets in the planar direction.

[0032] Both side portions of the top sheet 30 may be folded back to the back side at the side edges of the absorbent element 50, or may protrude laterally beyond the side edges of the absorbent element 50 without being folded back.

[0033] For the purpose of preventing displacement of the top sheet 30 relative to the member on the back side, it is desirable to fix it to the member adjacent to the back side by joining means such as material welding like heat sealing, ultrasonic sealing, or by a hot melt adhesive. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging non-woven fabric 58 located on the front side of the absorbent body 56 by the hot melt adhesive applied to its back surface.

[0034] (Intermediate sheet) In order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorbent body 56, an intermediate sheet (also called "second sheet") 40 with a faster liquid permeation rate than the top sheet 30 can be provided. This intermediate sheet 40 is for quickly transferring the liquid to the absorbent body to enhance the absorption performance of the absorbent body 56 and preventing the "reverse return" phenomenon of the absorbed liquid from the absorbent body. The intermediate sheet 40 can also be omitted. Also, in this case, the top sheet 30 can also be omitted.

[0035] As the intermediate sheet 40, examples include materials similar to the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point-bond nonwoven fabric, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use composite fibers with a core-sheath structure for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) with high rigidity is preferable. The basis weight is preferably 17~80 g / m 2 is preferable, and 25~60 g / m 2 is more preferable. The fineness of the raw material fibers of the nonwoven fabric is preferably 2.0~10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers without a core, hollow fibers, or eccentric and hollow fibers as all or part of the mixed fibers of the raw material fibers.

[0036] In the illustrated example, the intermediate sheet 40 is shorter than the width of the absorber 56 and is disposed in the center, but it may be provided over the entire width. The length of the intermediate sheet 40 in the front-rear direction may be the same as the overall length of the diaper, the same as the length of the absorbent element 50, or within a short length range centered on the liquid-receiving region.

[0037] For the purpose of preventing displacement of the intermediate sheet 40 relative to the member on the back side, it is desirable to fix it to the member adjacent to the back side by means of material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging nonwoven fabric 58 located on the front side of the absorber 56 by a hot melt adhesive applied to its back surface.

[0038] (Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited. For example, it can be a plastic film made of a polyolefin resin such as polyethylene or polypropylene, a laminated non-woven fabric with a plastic film provided on the surface of a non-woven fabric, a laminated sheet obtained by overlapping and joining a non-woven fabric or the like on a plastic film, and the like. It is preferable to use a material that is liquid-impermeable and has moisture permeability, which is preferably used from the viewpoint of preventing stuffiness, for the liquid-impermeable sheet 11. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in a polyolefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it in one or two axial directions is widely used. In addition to this, a non-woven fabric using microdenier fibers, a non-woven fabric with enhanced leak-proof properties by reducing the voids between fibers by applying heat or pressure, a sheet made liquid-impermeable without using a plastic film by methods such as coating a highly water-absorbent resin, a hydrophobic resin, or a water-repellent agent can also be used as the liquid-impermeable sheet 11. However, in order to obtain sufficient adhesive strength during adhesion via a hot melt adhesive to the cover non-woven fabric 13 described later, it is desirable to use a resin film.

[0039] As shown in the figure, the liquid-impermeable sheet 11 has a width that fits on the back side of the absorption element 50. In addition, in order to enhance leak-proof properties, both sides of the absorption element 50 can be wrapped around and extended to both sides of the side surface of the top sheet 30 of the absorption element 50. The width of this extended portion is appropriately about 5 to 20 mm on each of the left and right sides.

[0040] (Absorption element) The absorption element 50 has an absorber 56 and a packaging non-woven fabric 58 that wraps the entire absorber 56.

[0041] (Absorber) The absorber 56 is a mixture and accumulation of pulp fibers and superabsorbent polymer particles. The basis weight of the pulp fibers can be, for example, about 100 to 450 g / m 2 or so.

[0042] Superabsorbent polymer particles include "powders" in addition to "particles". As superabsorbent polymer particles, those used for disposable diapers of this type can be used as they are. For example, it is desirable that the proportion of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1:2006) is 30% by weight or less, and it is also desirable that the proportion of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1:2006) is 60% by weight or more.

[0043] As the material of the superabsorbent polymer particles, it can be used without particular limitation, but those with a water absorption of 40 g / g or more are preferred. Superabsorbent polymer particles include those of starch-based, cellulose-based, synthetic polymer-based, etc. Examples include starch-acrylic acid (salt) graft copolymers, saponified products of starch-acrylonitrile copolymers, cross-linked products of sodium carboxymethyl cellulose, and acrylic acid (salt) polymers. As the shape of the superabsorbent polymer particles, the commonly used powdery or granular ones are preferred, but other shapes can also be used.

[0044] As superabsorbent polymer particles, those with a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, so-called reverse leakage, where the liquid supplied into the absorber 56 flows back out of the absorber 56, is likely to occur.

[0045] Also, as superabsorbent polymer particles, those with a gel strength of 1000 Pa or more are preferably used. This can effectively suppress the stickiness after liquid absorption even when the absorber 56 is bulky.

[0046] The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 - 350 g / m 2 If the basis weight of the polymer is less than 50 g / m 2 it becomes difficult to ensure the absorption amount. If it exceeds 350 g / m 2When it exceeds this value, the effect saturates.

[0047] The ratio of the fibers and the superabsorbent polymer particles in the absorber 56 is not particularly limited. For example, the ratio of fibers to superabsorbent polymer particles can be 40:60 to 65:35 by weight. In particular, when the ratio of fibers to superabsorbent polymer particles is 50:50 to 65:35 by weight, the absorber 56 has excellent shape retention, absorption rate, and ease of forming the compression portion 51 described later. Also, the risk of the superabsorbent polymer particles coming out is low, which is preferable. Further, it is preferable that the superabsorbent polymer particles are present substantially uniformly throughout the absorber 56. However, in order to suppress the superabsorbent polymer particles from coming out to the front side, it is preferable that the content of the superabsorbent polymer particles decreases stepwise or continuously from the back side to the front side. In particular, as shown in FIG. 19, it is preferable to provide a coating layer 56c in which only pulp fibers are accumulated so as to cover the surface of the absorber 56. Even when the coating layer 56c consisting only of pulp fibers is provided, the ratio of the fibers and the superabsorbent polymer particles is preferably within the above-mentioned range.

[0048] The thickness 56t of the absorber 56 is not particularly limited, but can be 3 to 15 mm.

[0049] The absorber 56 only needs to extend across both the front and rear sides of the crotch portion M so as to include the crotch portion M. In the case of a pant-type disposable diaper as in this example, the absorber 56 preferably extends to the peripheral edge portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. Note that the symbol 56X indicates the overall width of the absorber 56.

[0050] To ensure the amount of absorption in the crotch area M, it is preferable that the absorber 56 has a substantially rectangular shape as in the example shown in Fig. 8. Also, to improve the fit in the crotch area M as in the example shown in Fig. 12(a), it is possible to make the width of the absorber 56 in the crotch area M narrower than both the front and rear sides, giving it a constricted shape. In this case, to ensure the amount of absorption in the crotch area M, it is preferable that the width n1 of the narrowest part of the absorber 56 in the crotch area M is 0.85 times or more the total width 56X of the absorber 56.

[0051] The crotch area M is the area where the absorbent body 56 is in the constricted area 56 N In the case where the constricted portion 56 N The range in the front-rear direction LD having the constricted portion 56 N However, in the illustrated example, when the outer shape of the diaper in the unfolded state has a constricted portion, it means the range in the front-to-back direction LD having the constricted portion of the outer shape of the diaper (in the illustrated example, between the front exterior body 12F and the rear exterior body 12B), and in the case where there is no constricted portion, it means the portion located in the center in the front-to-back direction LD and whose dimension in the front-to-back direction LD is 20 to 30% of the total length of the product. The portions extending forward and backward from the crotch region M, respectively, are the front portion and the rear portion.

[0052] (Low weight area) As shown in FIGS. 8 and 12, the absorber 56 may have elongated low basis weight portions 56L extending in the longitudinal direction LD on both sides in the width direction WD in the crotch portion M, or may not have the low basis weight portions 56L as shown in FIGS. 1 to 6. The low basis weight portion 56L means a portion with a low basis weight and does not include a portion where the basis weight does not change only by being compressed in the thickness direction like the compression portion 51 described later. The low basis weight portion 56L can be a slit penetrating in the thickness direction, but as in the illustrated example, it is preferable to be a recess with a small accumulation amount of pulp fibers and superabsorbent polymer particles because it facilitates ensuring the absorption amount. This recess may be formed on the front surface or the back surface of the absorber 56. By providing such a low basis weight portion 56L in the absorber 56, the bending of the absorber 56 along the low basis weight portion 56L is promoted, and the fit of the absorption element 50 in the crotch portion M is improved. The total basis weight of the pulp fibers and superabsorbent polymer particles in the low basis weight portion 56L only needs to be less than the total basis weight of the pulp fibers and superabsorbent polymer particles in the portion other than the low basis weight portion 56L. For example, it can be 0.1 to 0.5 times the total basis weight of the pulp fibers and superabsorbent polymer particles in the portion other than the low basis weight portion 56L.

[0053] As long as the low attachment portion 56L is elongated in the front-rear direction LD, it may extend linearly along the front-rear direction LD, or may bend so as to be positioned laterally as it goes toward both sides in the front-rear direction LD as in the illustrated example. Also, the front and rear ends of the low attachment portion 56L can have an appropriate shape. For example, in addition to being linear as in the example shown in Fig. 12(a), it can have a shape that bulges in a curved shape (such as a semi-circular arc shape) as in the example shown in Fig. 8, or although not shown, the corners at both ends can be rounded and the middle portion can be linear. The width m1 of the low attachment portion 56L can be determined as appropriate. For example, it can be 0.04 to 0.1 times the width n1 of the narrowest portion in the crotch portion M of the absorber 56 (in the case of a rectangle, it means the total width 56X). The width m1 of the low attachment portion 56L may be constant in its length direction or may vary. The dimensions and arrangement of the low attachment portion 56L in the front-rear direction LD can be determined as appropriate. For example, the dimension m2 of the low attachment portion 56L in the front-rear direction LD can be 50 to 120%, more preferably 50 to 80% of the dimension of the crotch portion M in the front-rear direction LD. Also, the low attachment portion 56L may be contained within the range of the crotch portion M, or may protrude to the front side, rear side, or both the front and rear sides of the crotch portion M.

[0054] One low attachment portion 56L is provided on each of both sides (left and right sides) in the width direction WD in the crotch portion M, and in addition to providing one in the center in the width direction WD as shown in Figs. 8 and 12(a), only one can be provided on each of both sides in the width direction WD in the crotch portion M as shown in Fig. 12(b), or although not shown, only one can be provided in the center in the width direction WD.

[0055] (Compression portion) In the absorption element 50, as shown in FIGS. 3, 4, and 9, compression portions 51 that are compressed in the thickness direction so as to be recessed from the back surface of the absorption element 50 to the inside of the absorber 56 are provided at intervals. Further, the absorption element 50 is not provided with a compression portion 51 that is compressed in the thickness direction so as to be recessed from the front surface of the absorption element 50 to the inside of the absorber 56. The compression portion 51 is a high-density portion that is compressed by pressing (direct pressurization) and has substantially the same thickness, and is the bottom of the depression. Hereinafter, the portion other than the compression portion 51 is referred to as an uncompressed portion 52. The uncompressed portion 52 is thicker and has a lower density than the compression portion 51. However, even in the uncompressed portion 52, near the periphery of the compression portion 51, as a result of the absorber 56 and the packaging nonwoven fabric being deformed so as to be pulled by the deformation of the compression portion 51, the density increases as it approaches the compression portion 51. As long as the uncompressed portion 52 is thicker and has a lower density than the compression portion 51, the whole may be compressed in the thickness direction simultaneously with the formation of the compression portion 51, or before or after that. The shape and arrangement of the uncompressed portion 52 are determined according to the shape and arrangement of the compression portion 51, and can be made into a staggered shape, a net shape, a lattice shape, a striped shape, or the like.

[0056] An absorption element having such compression portions 51 and uncompressed portions 52 can be manufactured by a known method such as embossing. For example, a first step of forming an absorber 56 by mixing and integrating pulp fibers and superabsorbent polymer particles, and packaging Non-woven fabric forming a package formed by packaging 58, and FIG. 2 1As shown, between an anvil roll 90 having a large number of protrusions 91 arranged at intervals in the same pattern as the compression part 51 on the outer peripheral surface and a smooth roll 92 having a cylindrical surface (without protrusions 91) facing the anvil roll 90, a third step is performed of forming the compression part 51 by passing the package 50P such that the surface that becomes the back surface of the absorption element 50 faces the anvil roll 90 side and pressing the portion of the package 50P sandwiched between the large number of protrusions 91 of the anvil roll 90 and the smooth roll 92. By doing so, the absorption element 50 having the compression part 51 can be manufactured. The compression part 51 may be formed while heating one or both of the anvil roll 90 and the smooth roll 92, or the compression part 51 may be formed without heating. In the third step, only the portion of the package 50P sandwiched between the large number of protrusions 91 of the anvil roll 90 and the smooth roll 92 may be pressed, or while pressing the entire package 50P, the portion sandwiched between the large number of protrusions 91 of the anvil roll 90 and the smooth roll 92 may be pressed to the deepest extent.

[0057] The thickness 50t of the absorption element 50 and the thickness 51t of the compression part 51 can be appropriately determined. For example, the maximum value of the thickness 50t of the absorption element 50 (the maximum value of the thickness of the non-compression part 52) can be 4 to 35 mm, and particularly preferably 5 to 13 mm. The thickness 51t of the compression part 51 can be appropriately determined, but in the normal case, it is preferably 15 to 35% of the maximum value of the thickness 50t of the absorption element 50.

[0058] The compression parts 51 can be arranged in an appropriate regular or irregular pattern. For example, as patterns of the compression parts 51, as shown in FIGS. 10 and 11, a pattern in which continuous linear compression parts 51 are formed in a grid pattern, or as shown in FIG. 16(b), a pattern in which dotted-line compression parts 51 provided in a dotted line are formed in a grid pattern, a pattern in which continuous linear or dotted-line compression parts 51 are formed in a stripe pattern (vertical stripe pattern, horizontal stripe pattern, etc.) (not shown), or a pattern in which dot-shaped compression parts 51 are arranged in a matrix pattern or a staggered pattern as shown in FIG. 16(a) can be exemplified.

[0059] One preferred pattern of the compression part 51 is a diagonal lattice pattern consisting of a first part 51a extending in a direction inclined 40 to 50° clockwise in plan view with respect to the front-rear direction LD and a second part 51b extending in a direction inclined 40 to 50° counterclockwise in plan view with respect to the front-rear direction LD, as shown in the examples of FIGS. 10 and 11. In this case, the shape of the unit frame 51f is substantially rhombic. The dimensions of the unit frame 51f can be determined as appropriate. For example, the dimension 51x in the width direction WD of the unit frame 51f can be about 15 to 20 mm. Also, the dimension 51y in the front-rear direction LD of the unit frame 51f can be about 15 to 20 mm.

[0060] When forming the compression part 51 in a linear or dotted line shape, the width 51w of the compression part 51 (the width of the bottom of the recess formed in the absorption element 50) can be determined as appropriate, but in the normal case, it is preferably about 1 to 3 mm. Also, when forming the compression part 51 in a dotted shape, the maximum diameter (the maximum diameter of the bottom of the recess formed in the absorption element 50) can be determined as appropriate, but in the normal case, it is preferably about 1 to 3 mm.

[0061] The area ratio of the compression part 51 (the bottom of the recess) occupying the back surface of the absorption element 50 can be determined as appropriate, but if the compression parts 51 are arranged too densely, the absorption element 50 will become hard, so it is preferably about 10 to 14%.

[0062] Also, the compression part 51 can be provided over the entire back surface of the absorption element 50, or can be provided only in part. For example, as shown in FIG. 16(a), it is one preferred embodiment to provide the compression part 51 only in the intermediate region 50M in the front-rear direction LD including the crotch part M and not to provide the compression part 51 in the front region 50F and the rear region 50B on the front side and the rear side thereof. Since the intermediate region 50M of the absorption element 50 is sandwiched between both legs and receives forces from various directions from both sides in the width direction WD due to the movement of the legs such as walking, it is desirable to improve the shape maintainability by the compression part 51, and it is desirable to improve the prevention of the escape of the superabsorbent polymer particles by not having the compression part 51 in the other regions.

[0063] Also, when the absorbent element 50 is firmly fixed to the member adjacent to the back side (the liquid-impermeable sheet 11 in the illustrated example) near both side edges thereof, as a result, both side portions of the absorbent element 50 are less likely to deform, and thus it is preferable that superabsorbent polymer particles are less likely to escape from both side portions. In particular, as in the example shown in FIG. 16(a), it is preferable that no compression portions 51 are provided in the vicinity of both side edges of the absorbent element 50 (for example, about 5 to 10 mm in the width direction WD), and both side edges of the joining region 50HM between the absorbent element 50 and the member adjacent to the back side thereof (the liquid-impermeable sheet 11 in the illustrated example) are positioned between both side edges of the absorbent element 50 and the compression portion 51 closest thereto.

[0064] Also, as shown in FIGS. 5, 17, and 18, when the back surface of the absorbent element 50 is adhered to the liquid-impermeable sheet 11 via a hot melt adhesive HM, and the liquid-impermeable sheet 11 extends from in front of the front edge of the absorbent element 50 to behind the rear edge of the absorbent element 50, and from the left side of the left side edge of the absorbent element 50 to the right side of the right side edge of the absorbent element 50, it is preferable that this hot melt adhesive HM is applied from in front of the front edge of the absorber 56 to behind the rear edge of the absorber 56, and from between the left side edge of the absorber 56 and the left side edge of the absorbent element 50 to between the right side edge of the absorber 56 and the right side edge of the absorbent element 50. Thereby, while suppressing a decrease in flexibility of both side edges of the absorbent element, it is possible to effectively suppress the escape of superabsorbent polymer particles from the back surface of the absorbent element. As long as this hot melt adhesive HM is applied from in front of the front edge of the absorber 56 to behind the rear edge of the absorber 56, it may be applied from a position between the front edge of the absorber 56 and the front edge of the absorbent element 50 to a position between the rear edge of the absorber 56 and the rear edge of the absorbent element 50, or may be applied from in front of the front edge of the absorbent element 50 to behind the rear edge of the absorbent element 50.

[0065] (Packaging nonwoven fabric) The packaging nonwoven fabric 58 has a meltblown layer formed of fibers having an average fiber diameter of 5 μm or less, and in a state of being stacked five sheets, the air permeability of Method A (Frazee method) measured according to JIS L 1096:2010 is 25.5 to 70.0 cm 3 / cm 2A non-woven fabric having a ventilation rate of 40.0 to 70.0 cm 3 / cm 2 ·s in a state where five sheets of the packaging non-woven fabric 58 are stacked is preferable. This ventilation rate can be measured, for example, using a ventilation rate measuring instrument (model AP-500KZ4) manufactured by Dainippon Scientific Co., Ltd. The melt-blown layer is a non-woven fabric layer in which ultrafine fibers obtained by spinning a molten resin raw material into a high-speed hot gas stream are accumulated and the spaces between the fibers are bonded. The average fiber diameter of the constituent fibers is as thin as 10 μm or less, the fiber length is 30 μm or more long fibers, and the fiber spacing is also small. The average fiber diameter of the fibers in the melt-blown layer is preferably 2.5 μm or less. Also, the average fiber diameter of the fibers in the melt-blown layer can be 1 μm or more, and is preferably 2 μm or more. 3 / cm 2 The total basis weight of the melt-blown layer (the sum of the basis weights of all layers when there are multiple melt-blown layers) and the total thickness (the sum of the thicknesses of all layers when there are multiple melt-blown layers) can be determined as appropriate. For example, the total basis weight of the melt-blown layer can be 0.3 to 6 g / m 2 , and the total thickness of the melt-blown layer can be 0.01 to 0.35 mm.

[0066] By using a non-woven fabric having such a dense melt-blown layer, problems (such as tearing during manufacturing or use) when using crepe paper can be solved. In addition, as described above, by providing the compression portion 51 that is recessed from the back surface of the absorption element 50 to inside the absorber 56, not only can the shape maintainability of the absorber 56 be improved, but also by not providing the compression portion 51 that is recessed from the surface of the absorption element 50 to inside the absorber 56, even when using the packaging non-woven fabric 58 with the minimum necessary thickness, the fiber gaps in the portion (surface portion) covering the surface of the absorption element 50 of the packaging non-woven fabric 58 do not need to be widened, and the superabsorbent polymer particles contained in the absorber 56 can be maintained in a state where it is difficult to pass through the surface portion of the packaging. 2 Therefore, while improving the shape maintainability of the absorber 56 and the like by providing the compression portion 51 as in the prior art, the leakage of the superabsorbent polymer particles, which is a problem in that case, can be effectively suppressed.

[0067] A non-woven fabric having a ventilation rate of 40.0 to 70.0 cm 3 / cm 2 ·s in a state where five sheets of the packaging non-woven fabric 58 are stacked is preferable. This ventilation rate can be measured, for example, using a ventilation rate measuring instrument (model AP-500KZ4) manufactured by Dainippon Scientific Co., Ltd. The melt-blown layer is a non-woven fabric layer in which ultrafine fibers obtained by spinning a molten resin raw material into a high-speed hot gas stream are accumulated and the spaces between the fibers are bonded. The average fiber diameter of the constituent fibers is as thin as 10 μm or less, the fiber length is 30 μm or more long fibers, and the fiber spacing is also small. The average fiber diameter of the fibers in the melt-blown layer is preferably 2.5 μm or less. Also, the average fiber diameter of the fibers in the melt-blown layer can be 1 μm or more, and is preferably 2 μm or more. Non-woven fabric The total basis weight of the melt-blown layer (the sum of the basis weights of all layers when there are multiple melt-blown layers) and the total thickness (the sum of the thicknesses of all layers when there are multiple melt-blown layers) can be determined as appropriate. For example, the total basis weight of the melt-blown layer can be 0.3 to 6 g / m 2 , and the total thickness of the melt-blown layer can be 0.01 to 0.35 mm.

[0068] As long as the packaging nonwoven fabric 58 has a meltblown layer, it may be a single-layer nonwoven fabric consisting only of the meltblown layer, but a laminated nonwoven fabric having one or more meltblown layers and one or more protective layers is preferred. The laminated nonwoven fabric may be manufactured by stacking the webs constituting each layer in order and then performing bonding between fibers and bonding of each layer by thermal adhesion (point adhesion, hot air adhesion, etc.), or by individually forming the nonwoven fabric layers constituting each layer (web formation and inter-fiber bonding) and then stacking them and joining the layers thermally or with an adhesive.

[0069] As the protective layer, a spunbond layer can be preferably used. As is well known, the spunbond layer is a nonwoven fabric layer formed by accumulating filaments obtained by extruding (spinning) a molten resin raw material from a nozzle and bonding between fibers. The average fiber diameter of the constituent fibers is larger than that of the fibers in the meltblown layer, and the fiber length is also longer than that of the meltblown layer. More specifically, as the packaging nonwoven fabric 58, an SMS nonwoven fabric, an SSMMS nonwoven fabric, etc. in which at least one meltblown layer is sandwiched between a pair of front and back spunbond layers can be preferably used. The material of the constituent fibers of each layer is not particularly limited. For example, polypropylene fibers, polyethylene / polypropylene bicomponent fibers, etc. can be used for the meltblown layer, and polypropylene fibers, polyethylene / polypropylene bicomponent fibers, etc. can be used for the spunbond layer.

[0070] The fiber diameter of the constituent fibers of the protective layer, the total basis weight (the sum of the basis weights of all layers when there are multiple protective layers), and the total thickness (the sum of the thicknesses of all layers when there are multiple protective layers) can be determined as appropriate. For example, the constituent fibers of the protective layer are preferably fibers having an average fiber diameter of 10 to 25 μm (particularly 15 to 20 μm). Also, the total basis weight of the protective layer is preferably 5 to 17.5 g / m 2 (particularly 5 to 10 g / m 2 ) and the total thickness of the protective layer is preferably 0.01 to 0.35 mm (particularly 0.1 to 0.2 mm).

[0071] The basis weight and thickness of the packaging nonwoven fabric 58 can be determined as appropriate. As an example, for instance, the total basis weight of the packaging nonwoven fabric 58 is 10 to 15 g / m 2 (particularly preferably 10 to 13 g / m 2 ). Also, the thickness of the packaging nonwoven fabric 58 is preferably 0.2 to 0.8 mm.

[0072] If the packaging nonwoven fabric 58 is not easily stretchable, it becomes difficult to form a firm compression part 51 (that is, it becomes difficult to improve the shape maintainability), and the flexibility of the absorber 56 also decreases. Therefore, the packaging nonwoven fabric 58 has an elongation rate at standard time as defined in JIS L 1913:2010 of 20 to 100%, particularly 30 to 60% in the longitudinal direction LD, and an elongation rate at standard time as defined in JIS L 1913:2010 of 20 to 110%, particularly 50 to 70% in the width direction WD, which is preferable. Such a nonwoven fabric is likely to have larger fiber gaps due to the formation of the compression part 51, but by having the characteristic structure related to the compression part 51 and the like, it is possible to achieve both an improvement in the shape maintainability and flexibility of the absorber 56 and suppression of the leakage of the superabsorbent polymer particles.

[0073] The packaging structure of the packaging nonwoven fabric 58 can be determined as appropriate, but from the viewpoints of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear edges, as shown in the illustrated example, it is wound cylindrically so as to surround the front and back surfaces and both side surfaces of the absorber 56, and the front and rear edge portions thereof protrude from the front and back of the absorber 56, and it is preferable to join the overlapping portions of the wound and overlapping portions and the front and rear protruding portions by joining means such as hot melt adhesive and material welding.

[0074] In particular, as shown in FIG. 15, the packaging nonwoven fabric 58 has a surface portion 58s located on the front side of the absorber 56, a portion continuing from the surface portion 58s, a first back side portion 58a that wraps around one side edge of the absorber 56 and reaches the back side of the absorber 56, and a second back side portion 58b that wraps around the other side edge of the absorber 56 and reaches the back side of the absorber 56. The first back side portion 58a and the second back side portion 58b have a laminated portion 58W that overlaps with each other. If all the compression portions 51 are formed in the laminated portion 58W, it is preferable because it can also suppress the escape of the superabsorbent polymer particles from the back surface of the absorbent element 50.

[0075] The shape maintainability of the absorbent element 50 by the compression portion 51 depends on the maintainability of the compression portion 51 itself, and the maintainability of the compression portion 51 itself depends on the bonding strength between the packaging nonwoven fabric 58 and the absorber 56 in the compression portion 51 and the shape maintainability of the absorber 56 itself. When the bonding between the packaging nonwoven fabric 58 and the absorber 56 is performed by the hot melt adhesives HM1 and HM2, with the increase in the surface area due to the formation of the compression portion 51, in order to sufficiently maintain the bonding strength between the packaging nonwoven fabric 58 and the absorber 56 and the shape maintainability of the absorber 56 itself, more hot melt adhesives HM1 and HM2 than usual are required. Therefore, the back surface of the absorber 56 and the inner surface of the packaging nonwoven fabric 58 are bonded via the hot melt adhesives HM1 and HM2 of 5.0 to 20.0 g / m 2 , particularly 7.5 to 15.0 g / m 2 preferably over the entire region having at least the compression portion.

[0076] For example, as shown in FIG. 9, when a depression due to the compression portion 51 is formed on the back surface of the absorber 56, the above-described amount of the hot melt adhesive HM can be realized by providing two layers of hot melt adhesives HM1 and HM2 on the back surface of the absorber 56 over the entire region having the compression portion 51. Such a structure, as shown in FIG. 13, after applying the first hot melt adhesive HM1 over substantially the entire opposing surface with the absorber 56 on the inner surface of the unfolded packaging nonwoven fabric 58, the absorber 56 is disposed at the middle portion in the width direction WD of the first hot melt adhesive HM1 in the packaging nonwoven fabric 58, and the front surface of the absorber 56 and the packaging nonwoven fabric 58 are adhered via the first hot melt adhesive HM1. Then, after applying the second hot melt adhesive HM2 over substantially the entire back surface of the absorber 56, as shown in FIG. 14, the portions of the packaging nonwoven fabric 58 that protrude on both sides of the absorber 56 are each folded back onto the back surface of the absorber 56, and the back surface of the absorber 56 and the folded-back portions of the packaging nonwoven fabric 58 are adhered via the first hot melt adhesive HM1 and the second hot melt adhesive HM2, and the overlapping portion of the packaging nonwoven fabric 58 is adhered via the first hot melt adhesive HM1. Thereafter, as shown in FIG. 9, it can be manufactured by forming the lattice-shaped compression portion 51 by embossing.

[0077] The absorbent element 50 may not have any other sheet layer such as paper or non-woven fabric (which may of course have an adhesive layer) between the packaging non-woven fabric 58 and the absorbent body 56 for cost reduction as shown in FIG. 9 etc., or it may have other sheet layers on at least one of the front and back sides of the absorbent body 56. For example, it is known that the compressed portion 51 of the absorbent element 50 has a stronger liquid absorption force and higher liquid retention property compared to the non-compressed portion 52. Therefore, in order to prevent backflow and the wet feeling during wearing, it is desirable that the compressed portion 51 is farther from the skin. However, since the compressed portion 51 in this example is a portion compressed in the thickness direction so as to be recessed from the back surface of the absorbent element 50 into the absorbent body 56, it is closer to the wearer's skin than the compressed portion 51 formed in the opposite front-back direction. In particular, as will be described later, in the structure where the absorbent element 50 is not covered and the packaging non-woven fabric 58 is exposed on the surface of the diaper, the compressed portion 51 is even closer to the skin. Therefore, as shown in FIG. 20, a backflow prevention layer 57 can also be provided between the surface (skin side surface) of the absorbent body 56 and the back surface (non-skin side surface) of the packaging non-woven fabric 58. As the backflow prevention layer 57, a non-woven fabric having a lower density and being hydrophobic or hydrophilic than the absorbent body 56 can be preferably used. The thickness of the backflow prevention layer 57 can be determined as appropriate, but in the normal case, it can be about 0.1 to 1.2 mm. The backflow prevention layer 57 in the illustrated example is arranged shorter than the width of the absorbent body 56 and at the center, but it may be provided over the entire width of the absorbent body 56. The arrangement of the backflow prevention layer 57 in the longitudinal direction LD in the front-rear direction can also be determined as appropriate, and it may be arranged over the entire length of the absorbent body 56 or the entire length of the absorbent element 50, or it may be arranged only in the middle of the longitudinal direction LD including the crotch portion M.

[0078] (Raised gather) The raised gather 60 has a raised portion 68 that rises from the side portion of the interior body 200, and this raised portion 68 contacts the range from the wearer's groin to around the legs and up to the buttocks to prevent side leakage. The raised gather 60 in the illustrated example has a base side portion 60B that stands obliquely toward the center in the width direction and a tip side portion 60A that stands obliquely toward the outside in the width direction from the middle portion, but it is not limited to this, and appropriate changes such as standing toward the center in the width direction as a whole are possible.

[0079] More specifically, the rising gather 60 in the illustrated example has a belt-shaped gather sheet 62 having a length equal to the longitudinal length of the interior body 200. The gather sheet 62 is folded back in the width direction WD at the tip portion and folded over in two, and a plurality of elongated gather elastic members 63 are fixed at intervals in the width direction WD in an extended state along the longitudinal direction between the folded-back portion and the sheets in the vicinity thereof. The base end portion (the end portion on the opposite side of the sheet folded-back portion in the width direction WD) of the rising gather 60 located on the side opposite to the tip end portion is a root portion 65 fixed to the side portion of the interior body 200, and the portion other than the root portion 65 is a main body portion 66 (the portion on the folded-back portion side) extending from the root portion 65. Further, the main body portion 66 has a root side portion 60B extending toward the center in the width direction and a tip side portion 60A folded back at the tip of the root side portion 60B and extending outward in the width direction. And, while both end portions in the front-rear direction of the main body portion 66 are laid-down portions 67 fixed to the side surface of the top sheet 30 in a laid-down state, the intermediate portion in the front-rear direction located between these is a non-fixed rising portion 68, and a gather elastic member 63 along the front-rear direction LD is fixed in an extended state at least at the tip portion of the rising portion 68.

[0080] In the rising gather 60 configured as described above, the rising portion 68 rises so as to contact the skin as indicated by the arrow in FIG. 3 due to the contraction force of the gather elastic member 63. In particular, when the root portion 65 is located on the back side of the interior body 200, the rising portion 68 rises so as to open outward in the width direction in the crotch portion and the vicinity thereof, so that the rising gather 60 comes into surface contact around the legs, and the fit is improved. The root portion 65 can also be fixed to the front side of the interior body 200, for example, to the surfaces on both side portions of the top sheet 30.

[0081] In the illustrated example of the rising gather 60, in a bent structure in which the main body portion 66 is composed of a root side portion 60B extending toward the center in the width direction and a tip side portion 60A folded back at the tip of the root side portion 60B and extending outward in the width direction, the tip side portion 60A and the root side portion 60B are joined in a fallen state at the fallen portion 67, and the root side portion 60B is joined in a fallen state to the top sheet 30. At least one of various hot melt adhesives applied by various methods and material welding means such as heat sealing and ultrasonic sealing can be used to join the opposing surfaces at the fallen portion 67. In this case, the joining of the root side portion 60B and the top sheet 30 and the joining of the tip side portion 60A and the root side portion 60B may be performed by the same means or by different means. For example, it is preferable that the base portion 60B and the top sheet 30 are joined by a hot melt adhesive, and the tip portion 60A and the base portion 60B are joined by material welding.

[0082] As the gathered sheet 62, a nonwoven fabric that is soft and has excellent uniformity and hiding properties, such as a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), or a meltblown nonwoven fabric, and that is treated with silicone or the like to have a water repellent property as necessary, can be suitably used. In this case, the fiber basis weight of the nonwoven fabric is 10 to 30 g / m 2 Although not shown, a waterproof film may be interposed between the two folded gathered sheets 62.

[0083] As the gather elastic member 63, thread rubber or the like can be used. When using spandex thread rubber, the thickness is preferably 470 to 1240 dtex, and more preferably 620 to 940 dtex. The elongation rate of the gather elastic member 63 in the mounted state is preferably 150 to 350%, and more preferably 200 to 300%. The number of the gather elastic members 63 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval of the gather elastic members 63 is appropriately 3 to 10 mm. With such a configuration, it becomes easier to contact the skin in the area where the gather elastic member 63 is arranged. The gather elastic member 63 may be arranged not only on the tip side but also on the root side.

[0084] In the rising portion 68 of the rising gather 60, at least one of fixing means by a hot melt adhesive by various coating methods, heat sealing, and material welding such as ultrasonic sealing can be used for bonding the inner layer and the outer layer of the gather sheet 62 and fixing the gather elastic member 63 sandwiched therebetween. Since bonding the entire surfaces of the inner layer and the outer layer of the gather sheet 62 impairs flexibility, it is preferable that portions other than the bonding portion of the gather elastic member 63 are not bonded or are weakly bonded. In the illustrated example, a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic member 63 by coating means such as a com gun or a sure lap nozzle and sandwiched between the inner layer and the outer layer of the gather sheet 62, so that only the hot melt adhesive applied to the outer peripheral surface of the gather elastic member 63 fixes the gather elastic member 63 to the inner layer and the outer layer of the gather sheet 62 and fixes between the inner layer and the outer layer of the gather sheet 62.

[0085] Similarly, for fixing the lying portion 67, at least one of means by a hot melt adhesive by various coating methods and material welding such as heat sealing and ultrasonic sealing can be used.

[0086] (Side flap) As shown in FIGS. 1 to 4 and the like, side flaps 70 extending laterally of the absorber 56 are provided on both sides of the interior body 200, and it is preferable that a side expansion / contraction region SG that expands and contracts in the front-rear direction is formed in the side flap 70. The side flap 70 in the illustrated example includes one or a plurality of elongated side elastic members 73 provided along the front-rear direction LD and spaced apart from each other, a first sheet layer 71 facing the outside of the side elastic member 73, and a second sheet layer 72 facing the inside of the side elastic member 73.

[0087] The sheet material forming the first sheet layer 71 and the second sheet layer 72 is not particularly limited, and an appropriate non-woven fabric such as the above-mentioned rising gathers 60 or the non-woven fabric usable for the above-mentioned exterior bodies 12F and 12B can be selected. In the illustrated example, the gather sheet 62 of the rising gathers 60 is extended as described later to form the first sheet layer 71 and the second sheet layer 72. In this case, the front and rear ends of the side flap 70 coincide with the front and rear ends of the rising gathers 60 (that is, the front and rear ends of the interior body 200 in this case).

[0088] The side elastic member 73 is also not particularly limited, and an elongated elastic member similar to the above-mentioned gather elastic member 63 can be used. The elongation rate of the side elastic member 73 in the mounted state is preferably 150 to 350%, more preferably 200 to 270%. The number of the side elastic members 73 is preferably 2 to 16, more preferably 6 to 10. The arrangement interval of the side elastic members 73 is appropriately 5 to 10 mm.

[0089] The side elastic member 73 is fixed to the first sheet layer 71 and the second sheet layer 72. For the lamination of the first sheet layer 71 and the second sheet layer 72 and the fixing of the side elastic member 73 sandwiched therebetween, a hot melt adhesive HM by various coating methods, or fixing means by material welding such as heat sealing or ultrasonic sealing can be used. Since a large joint area between the first sheet layer 71 and the second sheet layer 72 impairs flexibility, it is preferable that the portions other than the adhesive portion of the side elastic member 73 are not joined or are weakly joined. In the illustrated example, the hot melt adhesive HM is applied only to the outer peripheral surface of the side elastic member 73 by coating means such as a com gun or a sure lap nozzle and sandwiched between the first sheet layer 71 and the second sheet layer 72, so that only the hot melt adhesive HM applied to the outer peripheral surface of the side elastic member 73 fixes the side elastic member 73 to the first sheet layer 71 and the second sheet layer 72 and fixes between the first sheet layer 71 and the second sheet layer 72.

[0090] Also, in the illustrated example, the sheet material forming the first sheet layer 71 and the sheet material forming the second sheet layer 72 are folded back at the side edges of the side flap 70, and this folded-back portion is fixed to the back surface of the liquid-impermeable sheet 11 (the bag is closed). This fixing can be performed by a hot melt adhesive HM as in the illustrated example, or can be performed by welding of the material.

[0091] The side flap 70 can also be omitted.

[0092] (Outer package) The outer bodies 12F and 12B consist of a rectangular front outer body 12F which is a part constituting at least the body circumference portion of the front body F as shown in the illustrated example, and a rectangular rear outer body 12B which is a part constituting at least the body circumference portion of the rear body B. The front outer body 12F and the rear outer body 12B are not continuous on the crotch side and may be separated in the front-rear direction LD (outer body two-piece type), or may be continuous from the front body to the rear body (outer body one-piece type) although not shown. The separation distance 12d in the front-rear direction in the outer body two-piece type can be, for example, about 40 to 60% of the total length Y. In the illustrated example, the lower edges of the front outer body 12F and the rear outer body 12B are linear along the width direction WD, but at least one of the lower edges of the front outer body 12F and the rear outer body 12B may be curved along the leg circumference.

[0093] In the disposable diaper of the outer body two-piece type, since the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, it is preferable that the back surface of the inner body 200 is provided with a cover non-woven fabric 13 extending from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200 so that the liquid-impermeable sheet 11 is not exposed. The inner surface and the outer surface of the cover non-woven fabric 13 can be adhered to the opposing surfaces via a hot melt adhesive, respectively. As the non-woven fabric used for the cover non-woven fabric 13, for example, the same material as that of the outer bodies 12F and 12B can be appropriately selected. Although not shown, the outer body may be continuous through the crotch from the front body F to the rear body B. In this case, the outer body has not only a portion corresponding to the body circumference region T but also a portion corresponding to the intermediate region L.

[0094] The front exterior body 12F and the rear exterior body 12B have a front body circumferential portion and a rear body circumferential portion that constitute the body circumferential region T. In the examples shown in FIGS. 1 and 2, the dimensions of the front exterior body 12F and the rear exterior body 12B in the front-rear direction LD are equal, and the front exterior body 12F and the rear exterior body 12B do not have a portion corresponding to the intermediate region L. However, as shown in FIG. 7, the front-rear dimension of the rear exterior body 12B is longer than that of the front exterior body 12F. The front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B may have a hip cover portion C that extends from the body circumferential region T toward the intermediate region L. Although not shown, the front exterior body 12F may also be provided with a groin cover portion that extends from the body circumferential region T toward the intermediate region L.

[0095] As shown in FIGS. 4 and 5, the exterior bodies 12F and 12B are formed by joining an outer sheet layer and an inner sheet layer that are respectively adjacent to the outside and inside of elastic members 16 to 19 described later by joining means such as hot melt adhesives or welding. The outer sheet layer and the inner sheet layer can be formed by two sheet materials 12S and 12H as in the illustrated example, or can also be formed by a single sheet material. For example, in the latter case, in part or all of the exterior bodies 12F and 12B, the inner sheet layer and the outer sheet layer are respectively formed by the inner portion and the outer portion of a single sheet material folded back at the edge of the waist opening WO (which may be the edge on the crotch side). The illustrated example is the former example. The sheet material 12S that forms the outer sheet layer in the lower waist portion wraps around the waist opening WO side of the sheet material 12H that forms the inner sheet layer in the lower waist portion and is folded back inside. This folded portion 12r extends so as to cover up to the end portion on the waist opening WO side of the interior body 200. On the other hand, in the waist portion, the folded portion 12r serves as the inner sheet layer adjacent to the inside of the elastic member.

[0096] In the outer bodies 12F and 12B, elastic members 16 to 19 are incorporated to enhance the fitness of the outer bodies to the wearer's torso circumference, and an elastic expansion / contraction region A2 that elastically expands and contracts in the width direction WD along with the expansion and contraction of the elastic members 16 to 19 is formed. In this elastic expansion / contraction region A2, the outer bodies 12F and 12B contract along with the contraction of the elastic members in the natural length state, and wrinkles or folds are formed. When the elastic members are elongated in the longitudinal direction, they can be elongated to a predetermined elongation rate where they can stretch out without wrinkles. As the elastic members 16 to 19, in addition to elongated elastic members such as thread rubber (illustrated example in the figure), known elastic members such as strip-shaped, net-shaped, film-shaped, etc. can be used without particular limitation. As the elastic members 16 to 19, synthetic rubber or natural rubber may be used.

[0097] Explaining the elastic members 16 to 19 in the illustrated example in more detail, a plurality of waist elastic members 17 are attached at intervals in the front-rear direction so as to be continuous over the entire width direction WD of the waist portions W of the outer bodies 12F and 12B. Also, among the waist elastic members 17, one or more disposed in a region adjacent to the lower waist portion U may overlap the inner body 200, or may be provided on both sides in the width direction excluding the width direction central portion that overlaps the inner body 200, respectively. As this waist elastic member 17, thread rubber with a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm 2 , particularly about 0.1 to 1.0 mm 2 is preferably provided at intervals of 2 to 12 mm, particularly 3 to 7 mm, in an amount of about 2 to 15, particularly about 4 to 10. The elongation rate of the waist portion W in the width direction WD by this is preferably about 150 to 400%, particularly about 220 to 320%. Also, it is not necessary for the waist portion W to use elastic members of the same thickness or to have the same elongation rate throughout the front-rear direction LD, and for example, the thickness and elongation rate may be partially different.

[0098] In addition, a plurality of lower waist elastic members 16 and 19 made of elongated elastic members are attached to the lower waist portion U of the outer bodies 12F and 12B at intervals in the front-rear direction, forming a lower waist stretchable region (region having the lower waist elastic members 16 and 19). As the lower waist elastic members 16 and 19, thread rubbers having a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber; in the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm 2 , particularly about 0.1 to 1.0 mm 2 are preferably provided about 5 to 30 at intervals of 1 to 15 mm, particularly 3 to 8 mm. The elongation rate in the width direction WD of the lower waist portion U is preferably about 200 to 350%, particularly about 240 to 300%. Also, it is not necessary for the lower waist portion U to use elastic members of the same thickness or have the same elongation rate throughout the front-rear direction LD, and the thickness and elongation rate may be different partially.

[0099] When elastic members 16 and 19 are provided in the front-rear direction range having the absorber 56 as in the lower waist portion U of the illustrated example, in order to prevent the contraction of the absorber 56 in the width direction WD in part or all of it, as shown in FIGS. 4, 5, and 1 8 etc., the middle in the width direction including part or all of the portion overlapping the absorber 56 in the width direction WD is made into a non-stretchable region A1, and both sides in the width direction thereof are made into stretchable regions A2 (which becomes the lower waist stretchable region in the illustrated example), which is preferable. The dimensions in the width direction of the stretchable regions A2 provided on both sides in the width direction of the non-stretchable region A1 are substantially constant in the front-rear direction LD as in the illustrated example, and although not shown, they can also be changed in the front-rear direction LD. Also, the dimensions in the width direction WD of the stretchable regions A2 provided on both sides in the width direction WD of the non-stretchable region A1 can be made substantially the same in the front body F and the back body B, or can be made different.

[0100] Such a stretchable region A2 and a non-stretchable region A1 can be constructed by attaching elastic members 16-17, 19 between the inner sheet layer and the outer sheet layer, and then pressing, heating, or finely cutting the elastic members 16, 19 at one point or almost entirely in the width direction middle of the region that will become the non-stretchable region A1, so as to kill the stretchability in the non-stretchable region A1 while leaving stretchability in the stretchable region A2. Note that an unnecessary elastic member 18 that does not substantially contribute to the formation of stretchability will remain in the non-stretchable region A1.

[0101] The sheet material 12 forming the inner sheet layer and the outer sheet layer H , 12 S can be used without particular limitation, but a non-woven fabric is preferred. When using a non-woven fabric, the basis weight per sheet is preferably about 10-30 g / m 2 .

[0102] The elastic members 16-19 can be fixed to the exterior bodies 12F, 12B by known methods. Also, the inner sheet layer and the outer sheet layer can be joined to each other by known methods. For example, in the portions of the exterior bodies 12F, 12B having the elastic members 16-19, the hot melt adhesive HM is applied only to the outer peripheral surfaces of the elastic members 16-19 by application means such as a com gun or a sure lap nozzle, and then sandwiched between the inner sheet layer and the outer sheet layer. Thus, only the hot melt adhesive HM applied to the outer peripheral surfaces of the elastic members 16-19 can be used to fix the elastic members 16-19 to the inner sheet layer and the outer sheet layer, and to fix the inner sheet layer and the outer sheet layer to each other.

[0103] (Interior body joint part) The interior body 200 can be joined to the exterior bodies 12F and 12B by joining means such as heat sealing or ultrasonic sealing, which are material welding methods, or by a hot melt adhesive. In the illustrated example, it is fixed to the inner surfaces of the exterior bodies 12F and 12B through the hot melt adhesive applied to the back surface of the interior body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the root portion 65 of the raised gather 60. As shown in FIG. 2, the interior body joint portion 20 for joining the interior body 200 and the exterior bodies 12F and 12B can be provided in substantially the entire region where the two overlap, and can also be provided, for example, in a portion excluding both end portions in the width direction of the interior body 200.

[0104] As described above, since the leakage of the superabsorbent polymer particles through the packaging nonwoven fabric 58 can be suppressed, as shown in FIGS. 17 and 18, members such as the top sheet 30 and the intermediate sheet 40 that cover the surface of the absorbent element 50 can be omitted. In that case, a significant cost reduction can be achieved. In this case, as long as the intermediate portion of the surface of the absorbent element 50, excluding both end portions in the width direction WD, is not covered by other members over the entire length in the front-rear direction LD and the packaging nonwoven fabric 58 is exposed on the surface, only the intermediate portion in the width direction WD does not have to be covered by other members as in the illustrated example, or the entire surface of the absorbent element 50 does not have to be covered by other members.

[0105] <Effect Confirmation Test> As shown in FIGS. 17 and 18, diaper-type disposable diapers samples 1 to 8 having the same structure as those shown in FIGS. 1 to 6 were produced, except that the top sheet 30 and the intermediate sheet 40 were omitted and the width of the joining region between the absorbent element 50 and the liquid-impermeable sheet 11 was enlarged. The other specifications were as shown in Table 1. Also, except for the specifications shown in Table 1, they were common to each sample.

[0106] The test apparatus 80 is shown in Fig. 22. This test apparatus 80 has a recovery tray 83 for receiving a superabsorbent polymer fixed on a shaking table 82b of a shaker 82 (MK161 manufactured by Yamato Scientific Co., Ltd.) installed on a horizontal plane 81. A friction body 84 made of a metal cylinder (diameter 55 mm) is set upright and fixed at the center of this recovery tray 83, and the recovery tray 83 and the friction body 84 are configured to shake integrally with the shaking table 82b. The vertical distance d1 between the upper surface of the friction body 84 and the upper surface of the shaking table 82b was 72 mm. Also, a pair of pedestals 85 were set upright and fixed on both lateral sides of the shaker 82 on the horizontal plane 81. The sample 86 was in a deployed state (shown in Fig. 1), and was stretched between the pedestals 85 so that the surface of the sample 86 (the exposed surface of the packaging nonwoven fabric) faced downward, and was fixed to the pedestals 85. At this time, the longitudinal direction LD of the sample 86 was made to be the major axis direction BD of the ellipse of the shaking method. Also, so that the friction body 84 contacts the surface of the sample 86, the vertical distance d2 between the friction body contact portion on the surface of the sample 86 and the upper surface of the shaking table 82b in a state where the friction body 84 is not installed was made 71 mm. Next, the shaking method of the shaker 82 was set as an ellipse (major axis direction shaking width w1: 30 mm, minor axis direction shaking width w2: 20 mm), and it was shaken for 2 minutes at a rotational speed of 90 rpm. As shown in Fig. 23, after the friction body 84 was moved elliptically and rubbed against the surface of the sample 86, the number of superabsorbent polymer particles that had fallen onto the recovery tray 83 was counted.

[0107] The test results are shown in Table 1. For Samples 1, 3, and 5, there was leakage of superabsorbent polymer particles, whereas for Samples 2, 4, and 6, despite the high air permeability of the packaging nonwoven fabric, there was no leakage of superabsorbent polymer particles. For Samples 7 and 8, since the basis weight of the packaging nonwoven fabric was high and the air permeability was low, there was no leakage of superabsorbent polymer particles in either case.

[0108]

Table 1

[0109] <Explanation of Terms in the Specification> The following terms in the specification shall have the following meanings unless otherwise specified in the specification.

[0110] · The "front-rear direction" means the direction indicated by the symbol LD in the figure (vertical direction), the "width direction" means the direction indicated by the symbol WD in the figure (left-right direction), and the front-rear direction and the width direction are orthogonal to each other.

[0111] · The "front side" means the side closer to the wearer's skin when worn, and the "back side" means the side farther from the wearer's skin when worn.

[0112] · The "surface" means the side closer to the wearer's skin when worn, and the "back surface" means the side farther from the wearer's skin when worn.

[0113] · The "elongation rate" means the value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation magnification of 2 times.

[0114] · "Artificial urine" is a mixture of urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt%.

[0115] · The "gel strength" is measured as follows. Add 1.0 g of superabsorbent polymer to 49.0 g of artificial urine and stir with a stirrer. After leaving the resulting gel in a thermo-hygrostat at 40 °C and 60% RH for 3 hours, return it to room temperature and measure the gel strength with a curd meter (manufactured by I.techno Engineering: Curdmeter-MAX ME-500).

[0116] · The "average fiber diameter" is obtained by observing the target layer at a magnification of 1000 times using a microscope (optical microscope or SEM, etc.), randomly selecting 30 constituent fibers and measuring the fiber diameter (μm), and calculating the average value.

[0117] · "Areal density" is measured as follows. After pre-drying the sample or test piece, it is left in a test chamber or device under standard conditions (test location: temperature 23 ± 1°C, relative humidity 50 ± 2%) until it reaches a constant weight. Pre-drying means making the sample or test piece reach a constant weight in an environment at a temperature of 100°C. For fibers with a moisture regain of 0.0%, pre-drying may not be necessary. From the test piece in a constant weight state, using a template for sample collection (100 mm × 100 mm), a sample with dimensions of 100 mm × 100 mm is cut out. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated, which is taken as the areal density.

[0118] · The "thickness" of thick members such as the absorber 56, the absorption element 50, and the compression part 51 is measured using a thickness gauge (Peacock, dial thickness gauge, model J - B (measurement range 0 - 35 mm, circular terminal with a measurement area diameter of 20 mm, measurement force of approximately 3.0 N, pressure of approximately 30 KPa)) manufactured by Ozaki Manufacturing Co., Ltd. With the sample and the thickness gauge horizontal, the measurement is taken.

[0119] · The "thickness" of thin sheets such as non-woven fabrics is measured automatically using an automatic thickness gauge (KES - G5 handy compression measurement program) under the conditions of load: 0.098 N / cm 2 and pressure area: 2 cm 2 The "thickness" of the packaging non-woven fabric means the thickness of the part where the thickness 50t of the absorption element 50 is the maximum value.

[0120] · The "layer thickness" of the non-woven fabric is obtained by observing the cross-section of the target layer at a magnification of 1000 times using a microscope (optical microscope or SEM, etc.) at the part where the thickness 50t of the absorption element 50 is the maximum value, randomly selecting 5 measurement locations to measure the apparent thickness, and calculating the average value.

[0121] · "Area ratio" means the ratio of the area of the target part per unit area, and is expressed as a percentage by dividing the total area of the target part (for example, the compression part 51) in the entire target area (for example, the back surface of the absorption element 50) by the area of the target area.

[0122] · The water absorption amount is measured according to JIS K7223-1996 "Test Method for Water Absorption Amount of Super Absorbent Resin".

[0123] · The water absorption rate is defined as the "time until the end point" when performing JIS K7224-1996 "Test Method for Water Absorption Rate of Super Absorbent Resin" using 2 g of super absorbent polymer and 50 g of physiological saline.

[0124] · The "deployed state" means a state where it is flatly deployed without shrinkage (including any shrinkage such as shrinkage by elastic members) or slack.

[0125] · The dimensions of each part, unless otherwise specified, mean the dimensions in the deployed state rather than the natural length state.

[0126] · When there is no description about the environmental conditions in the test or measurement, the test or measurement shall be carried out in a test chamber or device under standard conditions (the test location is at a temperature of 23 ± 1 °C and a relative humidity of 50 ± 2%).

Industrial Applicability

[0127] The present invention can be used for disposable diapers such as pant-type disposable diapers, tape-type disposable diapers, pad-type disposable diapers, etc., as well as for absorbent articles in general such as sanitary napkins.

Explanation of Signs

[0128] 11…Liquid-impermeable sheet, 12A…Side seal, 12B…Rear exterior body, 12E…Waist extension part, 12F, 12B…Exterior body, 12F…Front exterior body, 12S, 12H…Sheet material, 13…Cover nonwoven fabric, 16, 19…Lower waist elastic member, 17…Waist elastic member, 18…Unnecessary elastic member, 20…Inner body joint part, 200…Inner body, 30…Top sheet, 40…Intermediate sheet, 50…Absorbent element, 51…Compressed part, 51f…Unit frame, 52…Non-compressed part, 56…Absorbent body, 56c…Coating layer, 56L…Low basis weight part, 58…Packaging nonwoven fabric, 60…Upturned gather, 60A…Tip side part, 60B…Base side part, 62…Gather sheet, 63…Gather elastic member, 67…Collapsed part, 68…Upturned part, 70…Side flap, 71…First sheet layer, 72…Second sheet layer, 73…Side elastic member, A1…Non-stretchable region, A2…Stretchable region, B…Back body, C…Hip cover part, F…Front body, HM…Hot melt adhesive, L…Intermediate region, LD…Longitudinal direction, LO…Leg opening, M…Crotch part, SG…Side stretchable region, T…Torso circumference region, U…Lower waist part, W…Waist part, WD…Width direction, WO…Waist opening, HM1…First hot melt adhesive, HM2…Second hot melt adhesive, 57…Backflow prevention layer.

Claims

1. The garment has a crotch portion and a front portion and a rear portion extending forward and rearward from the crotch portion, The absorbent element includes an absorbent body provided in a front-rear direction range including the crotch area, and a wrapping nonwoven fabric wrapping the absorbent body; The absorbent body has a layer formed by mixing and accumulating pulp fibers and highly absorbent polymer particles, The packaging nonwoven fabric has a meltblown layer formed of fibers having an average fiber diameter of 5 μm or less, and has an air permeability of 25.5 to 70.0 cm according to Method A (Fragile method) measured in accordance with JIS L 1096:2010 in a state where five sheets are stacked. 3 / cm 2 A nonwoven fabric having a structure of s, The absorbent element is provided with compressed portions at intervals, the compressed portions being compressed in a thickness direction so as to be recessed from the back surface of the absorbent element into the absorbent body, The absorbent element does not have a compressed portion compressed in a thickness direction so as to be recessed from a surface of the absorbent element into the absorbent body. An absorbent article characterized by:

2. The packaging nonwoven fabric has one or more meltblown layers and one or more protective layers, The constituent fibers of the protective layer have an average fiber diameter of 10 to 25 μm, The packaging nonwoven fabric has a standard elongation rate in the front-rear direction, as defined in JIS L 1913:2010, of 20 to 100%, The standard elongation in the width direction as defined in JIS L 1913:2010 is 20 to 110%. The absorbent article of claim 1.

3. The basis weight of the pulp fiber in the absorbent body is 100 to 450 g / m 2 and the weight ratio of pulp fibers to superabsorbent polymer particles in the absorbent body is 30:70 to 70:30; The maximum thickness of the absorbent element is 4 to 35 mm; The thickness of the compressed portion is 15 to 35% of the maximum thickness of the absorbent element.

3. The absorbent article according to claim 1 or 2.

4. The width of the compressed portion is 1 to 3 mm, The compression portion is formed in an oblique lattice shape including a first portion inclined at 40 to 50 degrees clockwise in a plan view with respect to the front-rear direction and a second portion inclined at 40 to 50 degrees counterclockwise in a plan view with respect to the front-rear direction. The absorbent article according to claim 3.

5. The absorbent body has a covering layer in which only pulp fibers are accumulated and which covers the surface of the absorbent body.

3. The absorbent article according to claim 1 or 2.

6. The packaging nonwoven fabric has a surface portion located on the front side of the absorbent body, a first back side portion continuing from the surface portion, wrapping around one side edge of the absorbent body to reach the back side of the absorbent body, and a second back side portion continuing from the surface portion, wrapping around the other side edge of the absorbent body to reach the back side of the absorbent body, the first back portion and the second back portion have stacked portions that overlap each other, All of the compression portions are formed in the laminated portion.

3. The absorbent article according to claim 1 or 2.

7. The absorbent element has a middle portion, excluding both ends in the width direction, that is not covered by other members over the entire front-rear direction, and the wrapping nonwoven fabric is exposed on the surface of the absorbent article.

3. The absorbent article according to claim 1 or 2.

8. A liquid-impermeable sheet is attached to the back surface of the absorbent element via a hot melt adhesive, the liquid impermeable sheet extends from in front of the front edge of the absorbent element to behind the rear edge of the absorbent element, and from left of the left edge of the absorbent element to right of the right edge of the absorbent element; The hot melt adhesive is applied from the front edge of the absorbent body to the rear edge of the absorbent body, and from between the left edge of the absorbent body and the left edge of the absorbent element to between the right edge of the absorbent body and the right edge of the absorbent element.

3. The absorbent article according to claim 1 or 2.

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