Underpants type disposable wearing article

Abstract

To reduce deterioration in a touch of single plane surface gathers in a side non-stretchable region.SOLUTION: A front end and a rear end of a side flap 60 is a side non-stretchable region 70 having a fixed part 67 in which a surface part 61 is fixed to a back surface part 62. The fixed part 67 is separated from a side edge of the side non-stretchable region 70 to a center side in a width direction WD, and a part between the side edge of the side non-stretchable region 70 and the fixed part 67 includes a hollow part 70h over the entire width direction WD. The side non-stretchable region 70 includes a non-fixed free part 71 extending from the side edge to the center side in the width direction WD. As a result of the back surface part 62 between the free part 71 and the fixed part 67 in the side non-stretchable region 70 being contracted in the width direction WD together with a waistline stretchable region in the state of being worn, the surface part 61 of the free part 71 floats and bulges while the back surface part 62 is raised, and part of the surface part covers at least a side part of the surface of the fixed part 67.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a pants-type disposable wearing article having flat gathers on both sides in the width direction of an inner body. [Background technology]

[0002] Pant-type disposable wearing articles such as pants-type disposable diapers and pants-type sanitary napkins generally comprise an outer body having a waist portion of a front body, a waist portion of a rear body, and side seals formed by joining both side portions of these, an inner body joined to the middle of the width of the outer body so as to extend from the waist portion of the front body through the crotch portion to the waist portion of the rear body, a waist opening formed by the front edge of the front body and the rear edge of the rear body, and leg openings provided on both sides of the inner body.

[0003] The waist region of the outer garment is provided with an elastic member, which imparts stretchability in the width direction, allowing the waist region to fit well against the body surface of the wearer.

[0004] In addition, in pants-type disposable wearing articles, in order to improve the fit around the legs and prevent so-called side leakage, it is common for side gathers to be provided on both sides in the width direction of the inner body so as to fit the inner thighs of the wearer (see, for example, Patent Documents 1 to 3).

[0005] Various structures have been proposed for side gathers in the past. For example, gathers that rise from the sides of the inner body to the front side are generally called three-dimensional gathers, and are excellent at preventing leakage. In contrast, gathers formed by side flaps that extend out to the sides of the absorbent body (without being folded back to the front side) are generally called flat gathers, and are often used in combination with three-dimensional gathers.

[0006] Also, in particular, simple and low-cost products have been proposed that have flat gathers but no three-dimensional gathers (see, for example, Patent Documents 1 to 4). In particular, the side flaps described in Patent Document 4 have a side nonwoven fabric having a surface portion extending from the side edge of the absorbent body to the side edge of the side flap, and a back portion folded back at the side edge of this surface portion to extend to the side edge of the absorbent body, and an elongated gathered elastic member provided along the front-rear direction between the surface portion and the back portion, the front end and rear end of the side flap are side non-stretchable regions that do not shrink in the front-rear direction together with the gathered elastic member and have sheet joints where the surface portion and the back portion are joined, and the portion between the front and rear side non-stretchable regions of the side flap has a gathered elastic member fixed to the front and rear portion, shrinks in the front-rear direction together with the gathered elastic member, and is a flat gather that can stretch in the front-rear direction together with the gathered elastic member.

[0007] If the flat gathers extend to the area where they overlap with the stretchable area of ​​the waistband of the outer cover, contracted areas will be formed in both the front-rear and width directions, which is undesirable as it will deteriorate the fit and appearance. Therefore, as described above, it is desirable to provide non-stretchable side areas at the front and rear ends of the side flaps. Here, the sheet joints in the non-stretchable side areas are provided for the purpose of preventing the entire non-stretchable side area from becoming hollow and tubular, which would cause irregular deformation and deteriorate the fit.

[0008] However, in the case of the product described in Patent Document 4, the hard sheet joints in the non-stretchable side regions are exposed to the surface, which may cause a poor feel against the skin. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 5303689 [Patent Document 2] Patent No. 5400982 [Patent Document 3] Patent No. 6986097 [Patent Document 4] JP 2016-083122 A Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, a main object of the present invention is to reduce the deterioration of the feel against the skin in the non-elastic side regions of the single plane gathers. [Means for solving the problem]

[0011] The pants-type disposable wearing article that solves the above problems is as follows. <First aspect> an exterior body having a front body waist portion, a back body waist portion, and side seals formed by joining both side portions thereof; An inner body joined to the middle of the outer body in the width direction so as to extend from the waist portion of the front body through the crotch portion to the waist portion of the back body; a waist opening formed by a front edge of the front body and a rear edge of the rear body; and leg openings provided on both sides of the interior body, The inner body has an absorbent body that continues from a position in front of the crotch region to a position behind the crotch region, The waist portion of the front body and the waist portion of the back body have waist stretchable regions provided on at least both sides in the width direction, The waist elastic region incorporates a waist elastic member, and is contracted in the width direction together with the waist elastic member, and is extensible in the width direction together with the waist elastic member; A pair of side flaps extend from the side edges of the absorbent body on both sides in the width direction on both sides of the inner body, and extend in the front-rear direction from an area overlapping the waist-surrounding stretchable area of ​​the front body to an area overlapping the waist-surrounding stretchable area of ​​the rear body, The side flap has a side nonwoven fabric extending from the front surface of the side flap through the side edge of the side flap to the back surface of the side flap, and an elongated gathered elastic member provided along the front-rear direction between the front surface portion and the back surface portion of the side nonwoven fabric, The front surface portion and the back surface portion extend over the entire front and rear of the side flap, The front end and the rear end of the side flap are not contracted in the front-rear direction together with the gathered elastic member, and the front surface portion is directly or indirectly fixed to the back surface portion at a fixed portion, forming a side non-stretchable region. The side flaps are provided with flat gather regions between the front and rear non-elastic side regions, to which the gather elastic members are fixed, and which contract in the front-rear direction together with the gather elastic members, and which are stretchable in the front-rear direction together with the gather elastic members. Does not have three-dimensional gathers on the front side. A pants-type disposable wearable article; The fixed portion is spaced a first distance from the side edge of the side non-elasticated region toward the center in the width direction, A portion between the side edge of the side non-elasticated region and the fixed portion has a hollow portion extending over the entire width direction, the side non-elasticated region has a free portion that is not fixed to the exterior body and extends from a side edge of the side non-elasticated region to a position a second distance toward the center in the width direction, the second distance is greater than half the width dimension of the fixing portion and less than half the first distance; the back surface portion located between the free portion and the fixed portion is joined to the waist circumference stretchable region of the exterior body, contracts in the width direction together with the waist circumference elastic member, and is extensible in the width direction together with the waist circumference elastic member; The maximum stretch in the width direction of the waist stretch area is 200 to 320%. A pants-type disposable wearing article.

[0012] (Action and effect) In this pants-type disposable wear article, the maximum stretch in the width direction of the waist elastic region is E max Then, the waist stretch area is 0.5~0.7E max When the non-elastic side region is in a state of about the same degree of elasticity as when worn, the back surface of the region between the free portion and the fixed portion shrinks in the width direction together with the waist-surrounding elastic region, and due to the influence of this shrinkage, the back surface of the free portion rises up while the front surface rises up and bulges, and the portion of the front surface adjacent to the fixed portion (the non-fixed portion of the side nonwoven fabric) covers at least the side of the front surface of the fixed portion. Moreover, this bulged portion is crushed and widened when worn, so that a wider area of ​​the fixed portion is covered. As a result, the hard surface of the fixed portion in the non-elastic side region is less likely to come into contact with the skin, and deterioration of the feel is reduced.

[0013] <Second aspect> The first distance is 15 to 20 mm; the second distance is less than or equal to 1 / 3 of the first distance; The width of the fixing portion is 3 mm or more. A pants-type disposable wearing article according to a first embodiment.

[0014] (Action and effect) The dimensions of each part can be determined appropriately, but it is particularly preferable that they are within the range of this embodiment.

[0015] <Third aspect> When the first distance is w1, the second distance is w2, and the dimension of the fixing portion in the width direction is w3, 0.3(w1+w2) / 2≧w3 is satisfied. A pants-type disposable wearing article according to the first or second aspect.

[0016] (Action and effect) The dimensions of each part can be determined as appropriate, but it is preferable for them to be within the range of this embodiment, since this makes it easier to cover the fixing part over a wide area by increasing the bulge of the surface part.

[0017] <Fourth aspect> The second distance is greater than the width dimension of the fixed portion. Any one of 1 to 3 One aspect A pants-type disposable wearable item.

[0018] (Action and effect) The dimensions of each part can be determined as appropriate, but it is preferable for them to be within the range of this embodiment, since this makes it easier for the surface parts to swell.

[0019] <Fifth aspect> The back surface portion located at the fixed portion is joined to the waist-surrounding elastic region of the exterior body, and is contracted in the width direction together with the waist-surrounding elastic member, and is also extensible in the width direction together with the waist-surrounding elastic member. Any one of 1 to 4 One aspect A pants-type disposable wearable item.

[0020] (Action and effect) In this embodiment, the waist stretch area is 0.5 to 0.7E max When the garment is in a state of about the same degree of elasticity as when it is worn, the fixing part shrinks in the width direction together with the waist-surrounding elastic region and becomes smaller, so the coverage rate of the fixing part by the surface part increases relatively. Therefore, the surface of the fixing part is less likely to come into contact with the skin.

[0021] <Sixth aspect> the fastening portion is spaced laterally from a side edge of the absorbent body by a third distance; the surface portion has an end portion that protrudes from the fixed portion toward the center in the width direction by a fourth distance that is shorter than the third distance and is not joined to an adjacent member on the back side, the fourth distance is greater than half the width dimension of the fixed portion, A back surface portion located between the fixed portion and the side edge of the absorbent body is joined to the waist-surrounding elastic region of the exterior body, and is contracted in the width direction together with the waist-surrounding elastic member, and is extensible in the width direction together with the waist-surrounding elastic member. Any one of 1 to 5 One aspect A pants-type disposable wearable item.

[0022] (Action and effect) According to this embodiment, the end of the surface portion protruding from the fixing portion toward the center in the width direction is raised along the shrinkage wrinkles of the member located on the back side, and the part of this raised part adjacent to the fixing portion (the unfixed part of the side nonwoven fabric) covers at least the end of the surface of the fixing portion toward the center in the width direction. As a result, the surface of the fixing portion is even less likely to come into contact with the skin. Effect of the Invention

[0023] As described above, the present invention provides advantages such as reducing deterioration in the feel of the fabric in the non-elastic side regions of the single plane gathers. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is a plan view showing the front surface of the pants-type disposable diaper in an unfolded state. [Diagram 2] FIG. 2 is a plan view showing the underside of the pants-type disposable diaper in an unfolded state. [Diagram 3] 3 is a cross-sectional view of FIG. 1 along line 3-3. [Figure 4] This is a cross-sectional view of FIG. 1 along line 4-4. [Diagram 5] 5 is a cross-sectional view of FIG. 1 along line 5-5. [Figure 6] FIG. 2 is a plan view showing the surface of the inner body. [Figure 7] FIG. 2 is a front perspective view of the pants-type disposable diaper, viewed diagonally from below. [Figure 8] FIG. 4 is a cross-sectional view of a main part showing a mounted state. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. 11 is a plan view of the main part of FIG. [Figure 12] 4 is an enlarged cross-sectional view showing a main portion of a non-stretchable side region in an unfolded state. FIG. [Figure 13]FIG. 2 is an enlarged cross-sectional view showing a main portion of a non-elastic side region in a state where the region has contracted to 70%. [Figure 14] FIG. 4 is a front view showing the inclination of each portion of the side flap. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The above-mentioned pants-type disposable wearing article will be described in detail below with reference to an example of a pants-type disposable diaper shown in the attached drawings. Note that each component adjacent in the thickness direction is fixed or joined as necessary in the same manner as known diapers, except for the fixed or joined parts described below. The dotted parts in the cross-sectional view indicate an adhesive such as a hot melt adhesive as the fixing or joining means. The hot melt adhesive can be applied by known methods such as slot application, continuous line or dotted line bead application, spiral, Z-shaped, wavy (regular or irregular) spray application, or pattern coating (transfer of hot melt adhesive by letterpress printing). Alternatively or in addition to this, at the fixing part of the elastic member, the hot melt adhesive can be applied to the outer circumferential surface of the elastic member to fix the elastic member to the adjacent member. As the hot melt adhesive, for example, EVA-based, adhesive rubber-based (elastomer-based), polyolefin-based, polyester-polyamide-based, and other types are available, but they can be used without any particular limitation. As the fixing or joining means for joining each component, material welding means such as heat sealing and ultrasonic sealing can also be used. In a portion where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or joining is performed with a hot melt adhesive, intermittent pattern coating in a spiral, Z-shape, wave shape, etc. can be suitably used, and when coating an area greater than the coating width of one nozzle, intermittent pattern coating in a spiral, Z-shape, wave shape, etc. can be performed with or without gaps in the width direction. As a joining means for joining each component, material welding means such as heat sealing and ultrasonic sealing can also be used.

[0026] In addition, as the nonwoven fabric in the following description, known nonwoven fabrics can be appropriately used depending on the part and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation from synthetic fibers such as polyolefins such as polyethylene or polypropylene, polyesters, and polyamides (including single-component fibers and composite fibers such as core-sheath fibers), regenerated fibers such as rayon and cupra, and natural fibers such as cotton, and these can also be used in combination. In order to increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers that have been made hydrophilic by a hydrophilizing agent), or hydrophobic or water-repellent fibers (including fibers that have been made water-repellent by a water-repellent agent). Furthermore, nonwoven fabrics are generally classified according to the length of the fibers, the sheet formation method, the fiber bonding method, and the laminated structure into staple fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punched nonwoven fabrics, point bond nonwoven fabrics, laminated nonwoven fabrics (including SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), and the like, and any of these nonwoven fabrics can be used.

[0027] 1 to 7 show an example of a pants-type disposable diaper. The pants-type disposable diaper 100 includes a rectangular front exterior body 12F constituting a front waist area, a rectangular rear exterior body 12B constituting a rear waist area, and an inner body 200 joined to the middle of the exterior bodies 12F, 12B in the width direction WD so as to extend from the front exterior body 12F through the crotch area M to the rear exterior body 12B. Both sides of the front exterior body 12F and both sides of the rear exterior body 12B are joined to form side seals 12A, whereby an opening formed by the front and rear edges of the exterior bodies 12F, 12B becomes a waist opening WO through which the wearer's waist passes, and the parts on both sides of the width direction WD of the inner body 200 surrounded by the lower edges of the exterior bodies 12F, 12B and the side edges of the inner body 200 become leg openings LO through which the legs pass. The inner body 200 is a portion that absorbs and retains excrement such as urine, and the outer bodies 12F, 12B are portions that support the inner body 200 against the wearer's body. Furthermore, the symbol Y indicates the overall length of the diaper in the unfolded state (the length in the front-to-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 back body B), and the symbol X indicates the overall width of the diaper in the unfolded state.

[0028] The pants-type disposable diaper 100 has a waist region T defined as the front-to-rear range having the side seals 12A (the front-to-rear range from the waist opening WO to the upper ends of the leg openings LO), and an intermediate region L defined as the front-to-rear range of the portion forming the leg openings LO (between the front-to-rear region having the side seals 12A of the front body F and the front-to-rear region having the side seals 12A of the rear body B). The portions of the front exterior body 12F and the rear exterior body 12B located in the waist region T, i.e., the front waist portion and the rear waist portion, can be conceptually 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 (e.g., the thickness or elongation rate of the elastic member changes) in the front waist portion and the rear waist portion where the stretch stress in the width direction WD changes, the waist portion W is located closer to the waist opening WO than the boundary closest to the waist opening WO, and when there is no such boundary, the waist portion W is located at the portion extending from the absorber 56 or the inner body 200 toward the waist opening WO. The length of these in the front-rear direction varies depending on the size of the product and can be appropriately determined. For example, the waist portion W can be 15 to 40 mm, and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the middle region L are narrowed in a U-shape or curved shape so as to fit around the legs of the wearer, and these are the areas where the wearer's legs are inserted. As a result, the pants-type disposable diaper in the opened state has a generally hourglass shape.

[0029] (Exterior body) As shown in the figure, the exterior bodies 12F and 12B are composed of a rectangular front exterior body 12F that is a part that constitutes at least the waist part of the front body F, and a rectangular rear exterior body 12B that is a part that constitutes at least the waist part of the back body B. The front exterior body 12F and the rear exterior body 12B may not be continuous on the crotch side and may be separated in the front-to-back direction LD (two-piece exterior type), or may be continuous from the front body F through the crotch part M to the back body B (integrated exterior type), although not shown. The separation distance 12d in the front-to-back direction in the two-piece exterior type can be, for example, about 40 to 60% of the total length Y. In the example shown in the figure, the lower edges of the front exterior body 12F and the rear exterior body 12B are linear along the width direction WD, but at least one of the lower edges of the front exterior body 12F and the rear exterior body 12B may be curved so as to follow the leg circumference.

[0030] In a pants-type disposable diaper with a two-part exterior, the inner body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, so that the liquid-impermeable film 11 is not exposed on the back surface of the inner body 200, it is preferable to provide a cover nonwoven fabric layer 13 on the back surface of the inner body 200, which extends from between the front exterior body 12F and the inner body 200 to between the rear exterior body 12B and the inner body 200. The inner and outer surfaces of the cover nonwoven fabric layer 13 can be bonded to the opposing surfaces via a hot melt adhesive. The nonwoven fabric used for the cover nonwoven fabric layer 13 can be appropriately selected from the same material as the exterior bodies 12F and 12B, for example.

[0031] The front exterior body 12F and the rear exterior body 12B have a front waist portion and a rear waist portion that constitute the waist region T. In the example shown in Figures 1 and 2, the front exterior body 12B has a longer front-to-rear dimension than the front exterior body 12F, the front exterior body 12F does not have a portion corresponding to the middle region L, and the rear exterior body 12B has a buttocks covering portion 14 extending from the waist region T toward the middle region L, but the front exterior body 12F and the rear exterior body 12B may have the same dimension in the front-to-rear direction LD, and the front exterior body 12F and the rear exterior body 12B may not have a portion corresponding to the middle region L.

[0032] 3 to 5, the exterior bodies 12F, 12B are formed by bonding an outer sheet layer 12S and an inner sheet layer 12H adjacent to the outer and inner sides of the elastic members 15 to 17 described below by a bonding means such as a hot melt adhesive, welding, etc. The outer sheet layer 12S and the inner sheet layer 12H are formed by folding a single sheet material so that a crease is located on the waist opening side as shown in Fig. 5, or they can be formed by bonding two sheets of sheet material together (not shown).

[0033] The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H is not particularly limited, but nonwoven fabric is preferable. When nonwoven fabric is used, the basis weight per sheet is 10 to 30 g / m 2 It is preferable to set the temperature to about 100°C.

[0034] In order to improve the fit around the waist of the wearer, the exterior bodies 12F and 12B have elastic members 15-17 attached between the outer sheet layer 12S and the inner sheet layer 12H at a predetermined stretch rate, forming a waist-surrounding stretchable region that stretches elastically in the width direction WD together with the elastic members 15-17. When in a natural length state, the waist-surrounding stretchable region contracts as the elastic members 15-17 contract, forming wrinkles or folds, and when stretched in the longitudinal direction of the elastic members 15-17, it can be stretched to a predetermined stretch rate without wrinkles. As the elastic members 15-17, in addition to elongated elastic members such as rubber threads (illustrated example), known elastic members such as band-shaped, net-shaped, and film-shaped members can be used without any particular limitation. As the elastic members 15-17, synthetic rubber or natural rubber may be used. In the exterior bodies 12F, 12B, the outer sheet layer 12S and the inner sheet layer 12H are bonded together, and the elongated elastic members 15-17 sandwiched therebetween can be fixed by at least one of various application methods of hot melt adhesives and material welding such as heat sealing and ultrasonic sealing. Since the flexibility is lost if the entire surface of the exterior bodies 12F, 12B is strongly fixed, it is preferable that the parts other than the bonding parts of the elongated elastic members 15-17 are not bonded or are weakly bonded. In the illustrated example, the hot melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic members 15-17 by an application means such as a comb gun or a surwrap nozzle, and the elongated elastic members 15-17 are sandwiched between the two sheet layers 12S, 12H, so that the elongated elastic members 15-17 are fixed to the two sheet layers 12S, 12H and fixed between the two sheet layers 12S, 12H only by the hot melt adhesive applied to the outer peripheral surfaces of the elongated elastic members 15-17.

[0035] To explain the elastic members 15-17 in the illustrated example in more detail, a plurality of waist elastic members 17 are attached between the outer sheet layer 12S and the inner sheet layer 12H in the waist portion W of the outer bodies 12F, 12B at intervals in the front-rear direction and in a state stretched in the width direction at a predetermined stretch rate, forming a continuous waist stretch region over the entire width direction WD. Furthermore, of the waist elastic members 17, one or more members arranged in the region adjacent to the waist lower portion U may overlap the inner body 200, or may be provided on both sides of the width direction WD except for the width direction central portion overlapping with the inner body 200. The waist elastic member 17 has a thickness of 155-1880 dtex, particularly about 470-1240 dtex (in the case of synthetic rubber; in the case of natural rubber, a cross-sectional area of ​​0.05-1.5 mm 2 , especially 0.1 to 1.0 mm 2 It is preferable to provide about 2 to 15, and especially about 4 to 10, rubber threads of about 12 mm each, and especially at intervals of 3 to 7 mm, so that the elasticity in the width direction WD of the waist portion W is about 150 to 400%, and especially about 220 to 320%. It is not necessary for the waist portion W to use elastic members of the same thickness or to have the same elasticity in the front-to-rear direction LD, and for example the thickness or elasticity may be different in some parts.

[0036] In addition, between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower portion U of the exterior bodies 12F, 12B, a plurality of waist lower elastic members 15 made of elongated elastic members are attached at intervals in the front-rear direction and in a state stretched in the width direction at a predetermined stretch rate, forming waist lower stretchable regions on both sides in the width direction WD except for the widthwise center portion overlapping with the interior body 200. The waist lower elastic members 15 are of 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, a cross-sectional area of ​​0.05 to 1.5 mm 2 , especially 0.1 to 1.0 mm 2It is preferable to provide about 5 to 30 rubber threads of about 120 mm each at intervals of 1 to 15 mm, especially 3 to 8 mm, so that the elasticity in the width direction WD of the waist lower portion U is about 200 to 350%, especially 240 to 300%. It is not necessary for the waist lower portion U to use elastic members of the same thickness or to have the same elasticity in the front-to-back direction LD, and the thickness or elasticity may be partially different.

[0037] Between the outer sheet layer 12S and the inner sheet layer 12H in the buttocks cover portion 14 of the rear exterior body 12B, one or more buttocks cover elastic members 16 made of elongated elastic members are attached at intervals in the vertical direction and in a state stretched along the width direction at a predetermined stretch rate on both sides in the width direction WD except for the width direction central portion overlapping with the inner body 200, forming buttocks cover stretchable regions on both sides in the width direction WD except for the width direction central portion overlapping with the inner body 200. The buttocks cover elastic member 16 has 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, a cross-sectional area of ​​0.05 to 1.5 mm 2 , especially 0.1 to 1.0 mm 2 It is preferable to fix about 2 to 10 rubber threads (approximately 150 to 300% elongation, particularly 180 to 260%) at intervals of 5 to 40 mm, particularly 5 to 20 mm.

[0038] As shown in the figure, when the waist lower elastic member 15 and the buttocks covering elastic member 16 are provided on both sides of the width direction WD except for a part or the whole of the part overlapping with the inner body 200, the inner body 200 does not shrink more than necessary in the width direction, and the inner body 200 does not look bulky or have poor absorbency. This type of structure includes a case where the elastic members 15, 16 are present only on both sides of the width direction WD, as well as a case where the elastic members 15, 16 are present across the inner body 200 from one side to the other in the width direction, but the elastic members 15, 16 are cut finely in the widthwise intermediate part or the whole of the part overlapping with the inner body 200 as shown by the reference numeral 12X in Figures 2 and 4, so that no contractile force acts (effectively equivalent to not providing the elastic members 15, 16), and only both sides of the width direction WD are configured as contractile force acting parts. Of course, the arrangement of the lower-waist elastic member 15 and the buttocks-covering elastic member 16 is not limited to the above example, and some or all of the lower-waist elastic member 15 and the buttocks-covering elastic member 16 can be arranged across the inner body 200 from one side in the width direction to the other side so that an elastic force acts across the entire width direction, including the portion overlapping with the inner body 200.

[0039] (Interior body joint) The inner body 200 can be fixed to the outer bodies 12F, 12B by a joining means that uses material welding, such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated example, the back surface of the inner body 200 is fixed to the inner surface of the outer bodies 12F, 12B via a hot melt adhesive HM3. As shown in Fig. 2, this inner body joint 201 can be provided in almost the entire area where the two overlap, and can also be provided in a portion excluding both ends in the width direction of the inner body 200.

[0040] (Interior body) The shape of the inner body 200 is arbitrary, but in the illustrated example, it is rectangular. As shown in Figures 3 to 5, the inner body 200 comprises a liquid-permeable top sheet 30 that faces the wearer's skin, a liquid-impermeable film 11, and an absorbent element 50 interposed therebetween. Reference numeral 60 denotes a side flap 60 having flat gathers.

[0041] (Top sheet) The top sheet 30 can be made of any liquid-permeable material, such as a perforated or non-perforated nonwoven fabric, a perforated plastic sheet, or the like. However, when the top sheet 30 also serves as a covering material for the liquid-impermeable film layer 64, as in the example shown in Figures 3 and 4, it is preferable that the top sheet 30 be made of a nonwoven fabric.

[0042] When both sides of the top sheet 30 in the width direction WD do not also serve as covering materials for the liquid-impermeable film layer 64 , the side edges of the absorbent element may be folded back to extend between the absorbent element 50 and the liquid-impermeable film 11 .

[0043] (middle seat) Although not shown, an intermediate sheet (also called a "second sheet") that has a faster liquid permeability than the top sheet 30 can be provided in order to quickly transfer liquid that has permeated the top sheet 30 to the absorbent body. This intermediate sheet is intended to quickly transfer liquid to the absorbent body, improve the absorption performance of the absorbent body, and prevent the "backflow" phenomenon of absorbed liquid from the absorbent body. The intermediate sheet can also be omitted.

[0044] (Liquid-impermeable film) The material of the liquid-impermeable film 11 provided on the back side of the absorbent 56 is not particularly limited, but may be, for example, a plastic film made of a polyolefin resin such as polyethylene or polypropylene. In recent years, it is preferable to use a liquid-impermeable and moisture-permeable material that has been used with preference from the viewpoint of preventing stuffiness for the liquid-impermeable film 11. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene or polypropylene, forming the sheet, and then stretching the sheet in a uniaxial or biaxial direction is widely used.

[0045] The liquid-impermeable film 11 can be configured to extend into the side flaps to improve the waterproofness of the flat gathers, as in the example shown in Figures 3 and 4, or it can be made wide enough to fit on the back side of the absorbent element 50 (not shown), or it can be folded back to the front side at the side edge of the absorbent element 50 and extend between the absorbent element 50 and the top sheet 30.

[0046] (Absorption element) 3, 4 and 9, the absorbent element 50 has an absorbent body 56 and a wrapping sheet 58 that wraps the entire absorbent body 56. The wrapping sheet 58 may be omitted.

[0047] (Absorbent) The absorbent body 56 can be formed by a fiber assembly. As the fiber assembly, in addition to stacked staple fibers such as cotton-like pulp or synthetic fibers, a filament assembly obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as required can be used. When stacking cotton-like pulp or staple fibers, the fiber weight is, for example, 100 to 300 g / m 2 In the case of a filament aggregate, for example, the weight is 30 to 120 g / m 2 In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.

[0048] It is preferable that superabsorbent polymer particles are mixed in the fiber aggregate. The superabsorbent polymer particles include not only "particles" but also "powder". As the superabsorbent polymer particles, those used in this type of disposable diaper can be used as they are. For example, it is preferable that the ratio of particles remaining on a 500 μm standard sieve (JIS Z8801-1:2006) when sieved (shaking for 5 minutes) is 30% by weight or less, and it is also preferable that the ratio of particles remaining on a 180 μm standard sieve (JIS Z8801-1:2006) when sieved (shaking for 5 minutes) is 60% by weight or more.

[0049] The material of the superabsorbent polymer particles is not particularly limited, but is preferably one with a water absorption capacity of 40 g / g or more (JIS K7223-1996 "Test method for water absorption capacity of superabsorbent resins"). The superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based ones, and starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose and acrylic acid (salt) polymers can be used. The shape of the superabsorbent polymer particles is preferably a powdery or granular one as is commonly used, but other shapes can also be used.

[0050] The highly absorbent polymer particles preferably have a water absorption speed of 70 seconds or less, particularly 40 seconds or less. If the water absorption speed is too slow, the liquid supplied into the absorbent body 56 tends to flow back out of the absorbent body 56, which is called backflow.

[0051] Moreover, the highly absorbent polymer particles preferably have a gel strength of at least 1000 Pa. This makes it possible to effectively prevent the sticky feeling after absorbing liquid, even when the absorbent body 56 is bulky.

[0052] The basis weight of the highly absorbent polymer particles can be appropriately determined according to the absorption amount required for the application of the absorbent body 56. Therefore, although it cannot be generally stated, it is generally in the range of 50 to 350 g / m 2 The polymer weight is 50 g / m 2 If it is less than 350g / m, it will be difficult to ensure sufficient absorption. 2 Above this, the effect saturates.

[0053] The ratio of fibers to superabsorbent polymer particles in the absorbent body 56 is not particularly limited, but when the weight ratio of fibers:superabsorbent polymer particles is 50:50 to 20:80, it is possible to obtain a thinner absorbent body 56 when compared with the same area and the same absorption amount. In this case, the thickness 56t of the absorbent body 56 is not particularly limited, but can be 3 to 15 mm.

[0054] The absorbent body 56 continues from a position in front of the crotch region M to a position behind the crotch region M, and preferably continues from the waistline regions W, U of the front body F to the waistline regions W, U of the back body B as in the illustrated example. The symbol 56X indicates the maximum width (total width) of the absorbent body 56.

[0055] In order to ensure an adequate amount of absorption in the crotch area M, it is preferable that the absorbent body 56 has a substantially rectangular shape. However, as shown in Figs. 1, 2, 10 and 12, if the absorbent body 56 has a minimum width portion 52 in the crotch area M and has widened portions 53 that are gradually wider from the minimum width portion 52 to a maximum width portion 54 on the front side of the crotch area M and to a maximum width portion 54 on the rear side of the crotch area M, the minimum width portion 52 and the widened portion 53 may be formed in a substantially rectangular shape. 53 A constricted portion 52 consisting of 53 This is preferable because it improves the fit around the inner thighs. In the latter case, in order to easily ensure the amount of absorption in the crotch region M, it is preferable that width 52w of the narrowest part of absorber 56 in crotch region M is 0.8 times or more the maximum width 56X of absorber 56. In addition, it is preferable that the dimension in the front-to-rear direction of constricted portions 52, 53 is about 20 to 30% of total product length Y.

[0056] In addition, the crotch area M refers to the constricted areas 52, 53 when the absorbent body 56 has the constricted areas 52, 53. 53 The range in the front-rear direction LD is defined as the range in which the absorbent body 56 has the constricted portion 52, 53 However, if the outer shape in the unfolded state has a narrowed portion as in the illustrated example, it means the range in the fore-and-aft direction LD having the narrowed portion of this outer shape (in the illustrated example, between the front outer body 12F and the rear outer body 12B); if there are no narrowed portions, it means the portion that is located in the center of the fore-and-aft direction LD and whose dimension in the fore-and-aft direction LD is 20 to 30% of the total product length Y.

[0057] (packaging sheet) When the wrapping sheet 58 is used, its material can be a liquid-permeable material such as tissue paper, particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, or a sheet with small holes. However, it is preferable that the sheet does not allow the superabsorbent polymer particles to escape. When using nonwoven fabric instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material that can be used is polypropylene, polyethylene / polypropylene composite, etc. The basis weight is 5 to 40 g / m 2 , especially 10 to 30 g / m 2 It is preferable that the following be used.

[0058] The packaging structure of the packaging sheet 58 can be determined as appropriate, but from the standpoint of ease of manufacture and preventing leakage of superabsorbent polymer particles from the front and rear edges, it is preferable to wrap it around the front and rear surfaces and both side surfaces of the absorbent body 56 in a cylindrical shape, with the front and rear edges protruding from the front and rear of the absorbent body 56, and to crush these protruding portions in the front and rear directions and join them with a joining means such as a hot melt adhesive.

[0059] (Side flap) 1 to 4, 6 and 12, the side flaps 60 are a pair of portions extending from the side edges of the absorbent body 56 on both sides in the width direction WD, and extend in the front-rear direction LD from an area overlapping with the waist-surrounding stretchable area of ​​the front body F (in the illustrated example, an area having the waist-lower elastic member 15) to an area overlapping with the waist-surrounding stretchable area of ​​the back body B (in the illustrated example, an area having the waist-lower elastic member 15). The side flaps 60 also have a side nonwoven fabric 66 extending from the front surface of the side flap 60, through the side edges of the side flap 60, to the back surface of the side flap 60, and elongated gather elastic members 631 to 633 provided between the front surface portion 61 and the back surface portion 62 along the front-rear direction LD. The front surface portion 61 and the back surface portion 62 extend over the entire side flap 60 in the front-rear direction LD. The front end and rear end of the side flap 60 are not contracted in the front-rear direction LD together with the gathered elastic members 631-633, and the front surface portion 61 is fixed to the back surface portion 62 to form a side non-stretchable region 70 having a fixing portion 67. The portion between the front and rear side non-stretchable regions 70 of the side flap 60 is a flat gathered region 80 to which the gathered elastic members 631-633 are fixed, contracted in the front-rear direction LD together with the gathered elastic members 631-633, and extensible in the front-rear direction LD together with the gathered elastic members 631-633. This pants-type disposable diaper does not have three-dimensional gathers that rise up on the front side, and has only flat gathers of the side flap 60. In the fixing portion 67 of the illustrated example, the front surface portion 61 is indirectly fixed to the back surface portion 62 via the liquid-impermeable film layer 64, but if no other member such as the liquid-impermeable film layer 64 is interposed, it will be directly fixed.

[0060] The dimension of the side non-elasticated region 70 in the front-to-rear direction LD may be different at the front end and the rear end of the side flap 60 as in the illustrated example, or may be the same.

[0061] Characteristically, the fixed portion 67 of the side non-stretchable region 70 is a first distance w1 away from the side edge of the side non-stretchable region 70 toward the center in the width direction WD, and the portion between the side edge of the side non-stretchable region 70 and the fixed portion 67 has a hollow portion 70h that spans the entire width direction WD. The side non-stretchable region 70 also has a free portion 71 that is not fixed to the exterior body 12 and extends a second distance w2 from the side edge of the side non-stretchable region 70 toward the center in the width direction WD, and the second distance w2 is greater than 1 / 2 the dimension w3 of the fixed portion 67 in the width direction WD and less than 1 / 2 the first distance w1. Furthermore, the back surface portion 62 located between the free portion 71 and the fixed portion 67 is bonded to the waist-surrounding stretchable region of the exterior body 12 with a hot melt adhesive HM3 or the like, and is contracted in the width direction WD together with the waist-surrounding elastic member, and is also extensible in the width direction WD together with the waist-surrounding elastic member, with the maximum elongation in the width direction WD of the waist-surrounding stretchable region being 200-320%. The hollow portion 70h is a portion where adjacent members in the thickness direction are not bonded, and in the illustrated example, the front surface portion 61 is a portion that is not fixed to the liquid-impermeable film layer 64 adjacent to its rear side and the back surface portion 62, but appropriate modifications are possible, such as fixing the liquid-impermeable film layer 64 to the front surface portion 61 and not bonding the back surface portion 62 to the liquid-impermeable film 11.

[0062] With this configuration, the maximum elongation in the width direction WD when the waist stretchable region is in an expanded state is limited to E max Then, the waist stretch area is 0.5~0.7E max 13, when the garment is in a state of approximately the same as when it is worn, in the side non-elasticated region 70, the back surface portion 62 of the region 72 between the free portion 71 and the fixed portion 67 shrinks in the width direction WD together with the waist-surrounding stretchable region, and due to the influence of this shrinkage, the back surface portion 62 of the free portion 71 rises up and the front surface portion 61 rises up and swells, and when worn, this swelled portion is crushed and widened, and the portion of the front surface portion 61 adjacent to the fixed portion 67 (the unfixed portion of the side nonwoven fabric 66) covers at least the side of the surface of the fixed portion 67. As a result, the hard surface of the fixed portion 67 in the side non-elasticated region 70 is less likely to come into contact with the skin, reducing deterioration of the feel against the skin.

[0063] Although the dimensions of each part can be determined appropriately, the dimension w3 of the fixing part 67 in the width direction WD is preferably 3 mm or more, and particularly preferably 3 to 5 mm. The first distance w1 is preferably 15 to 20 mm. The second distance w2 is preferably 1 / 3 or less of the first distance w1. In particular, it is preferable that 0.3(w1+w2) / 2≧w3, since this allows the surface portion 61 to bulge more and makes it easier to cover a wide area of ​​the fixing part 67.

[0064] In particular, it is preferable that the second distance w2 is larger than the dimension of the fixing portion 67 in the width direction WD, since this makes it easier for the surface portion 61 to bulge.

[0065] The dimension of the fixing part 67 in the front-to-back direction LD can be determined as appropriate, and is preferably about 0.8 to 1.0 times the dimension in the front-to-back direction LD of the side non-stretchable region 70. In the illustrated example, the edge of the fixing part 67 on the flat gather region 80 side is spaced from the flat gather region 80 (for example, about 0.05 to 0.2 times the dimension in the front-to-back direction LD of the side non-stretchable region 70) and the edge on the opposite side coincides with the edge of the inner body 200, but this may be reversed, or both edges in the front-to-back direction LD may coincide with the front and back edges of the side non-stretchable region 70, or both edges in the front-to-back direction LD may be spaced from the front and back edges of the side non-stretchable region 70 (for example, about 0.02 to 0.1 times the dimension in the front-to-back direction LD of the side non-stretchable region 70).

[0066] Of the side non-stretchable regions 70, the back surface portion 62 located at the fixed portion 67 and the portion located closer to the center in the width direction WD than that need not be fixed to the exterior body 12, but if the back surface portion 62 located at the fixed portion 67 is bonded to the waist stretchable region of the exterior body 12 with hot melt adhesive HM3 or the like, shrinks in the width direction WD together with the waist elastic member, and is extensible in the width direction WD together with the waist elastic member, as shown in Fig. 13, the fixed portion 67 shrinks and becomes smaller in the width direction WD together with the waist stretchable region, and the coverage ratio of the fixed portion 67 by the front surface portion 61 increases relatively. This makes it even less likely that the surface of the fixed portion 67 will come into contact with the skin, which is preferable.

[0067] In addition, the fixing portion 67 is spaced laterally from the side edge of the absorbent body 56 by a third distance w4, and the surface portion 61 may have an end portion 73 that protrudes from the fixing portion 67 toward the center in the width direction WD by a fourth distance w5 that is shorter than the third distance w4, and is not joined to an adjacent member on the back side. In this case, if the fourth distance w5 is greater than 1 / 2 the dimension of the fixed part 67 in the width direction WD, and the back surface portion 62 located between the fixed part 67 and the side edge of the absorbent body 56 is joined to the waist stretchable region of the outer body 12 with a hot melt adhesive HM3 or the like, contracts in the width direction WD together with the waist elastic member, and is capable of stretching in the width direction WD together with the waist elastic member, then, as shown in FIG. 13, the end portion 73 of the surface portion 61 protruding from the fixed part 67 toward the center in the width direction WD rises up along the shrinkage wrinkles of the member located on the back side thereof, and the portion of this raised portion adjacent to the fixed part 67 (the unfixed portion of the side nonwoven fabric 66) covers at least the end portion on the center side of the width direction WD of the surface of the fixed part 67, making it even less likely for the surface of the fixed part 67 to come into contact with the skin, which is preferable.

[0068] Although the dimensions of each portion can be determined appropriately, the third distance w4 is preferably about 5 to 8 times the dimension W3 in the width direction WD of the fixing portion 67. Moreover, the fourth distance w5 is preferably about 0.3 to 0.5 times the third distance w4.

[0069] The side flaps 60 preferably have a planar gather region 80 that continues from a side of the widest portion 54 of the absorber 56 in front of the crotch region M to a side of the widest portion 54 of the absorber 56 behind the crotch region M. The planar gather region 80 is a portion that incorporates elongated gather elastic members 631-633 along the front-to-rear direction LD, and is a portion that contracts in the front-to-rear direction LD together with the gather elastic members 631-633, and is also extensible in the front-to-rear direction LD together with the gather elastic members 631-633.

[0070] It is desirable that the width of the side flap 60 is sufficiently wide to reduce the effect of leg movement on the sides of the absorber 56. Therefore, the width 60w of the side flap 60 is preferably 0.1 to 0.5 times the maximum width 56X of the absorber 56, more preferably 0.3 to 0.5 times, and particularly preferably 0.4 to 0.5 times. In addition, the arrangement of the gathered elastic members 631-633 can be determined as appropriate, but as shown in the illustrated example, the gathered elastic members 631-633 consist of a first gathered elastic member 631 attached laterally from the side edge of the widest portion 54 of the absorbent body 56 at a first interval d1, a second gathered elastic member 632 attached laterally from the first gathered elastic member 631 at a second interval d2, and a third gathered elastic member 633 attached repeatedly from the second gathered elastic member 632 to the side edge of the side flap 60 at a third interval d3 (i.e., no other elastic members are included), and it is preferable that the second interval d2 is 1.5 to 5 times the third interval d3 and the first interval d1 is 0.3 to 0.8 times the second interval d2. More preferably, the second distance d2 is 1.5 to 2.5 times the third distance d3, and the first distance d1 is 0.3 to 0.7 times the second distance d2. More specifically, when used for babies and small children, the width of the side flap 60 is preferably 30 to 50 mm, and particularly preferably 40 to 50 mm.

[0071] Furthermore, assuming that the first gathered elastic member 631 has a first thickness and is attached to the side flap 60 with a first elongation rate, the second gathered elastic member 632 has a second thickness and is attached to the side flap 60 with a second elongation rate, and the third gathered elastic member 633 has a third thickness and is attached to the side flap 60 with a third elongation rate, (a1) the first elongation rate is greater than the second elongation rate and the third elongation rate. and the first thickness is 1.2 to 1.5 times the second and third thicknesses, (b1) the first thickness is 0.95 to 1.05 times the second and third thicknesses and the first elongation rate is 1.2 to 1.5 times the second and third elongation rates, or (c1) the first thickness is 1.2 to 1.5 times the second and third thicknesses and the first elongation rate is 1.2 to 1.5 times the second and third elongation rates. More preferably, (a2) the first elongation rate is 0.95 to 1.05 times the second elongation rate and the third elongation rate, and the first thickness is 1.3 to 1.4 times the second elongation rate and the third thickness; (b2) the first thickness is 0.95 to 1.05 times the second elongation rate and the third thickness, and the first elongation rate is 1.3 to 1.5 times the second elongation rate and the third elongation rate; or (c2) the first thickness is 1.3 to 1.4 times the second elongation rate and the third thickness, and the first elongation rate is 1.3 to 1.5 times the second elongation rate and the third elongation rate.

[0072] The gathered elastic members 631 to 633 may be elongated elastic members such as rubber threads or rubber strips. When rubber threads are used, the thickness of the first to third threads is preferably 400 to 950 dtex, and more preferably 470 to 780 dtex. The elongation ratio of the first to third threads is preferably 200 to 320%, and more preferably 260 to 320%.

[0073] In this way, when the width of the side flap 60 having the flat gathers is sufficiently wide, the first gather elastic member 631 is provided near the absorbent body 56, the second gather elastic member 632 is provided at a position somewhat away from the side, and the third gather elastic member 633 is repeatedly provided at narrow intervals up to the side edge of the side flap 60, and the force required to stretch the first gather elastic member 631 provided near the absorbent body 56 is stronger than the second gather elastic member 632 and the third gather elastic member 633, the appropriate wearing state will be as shown in Figures 7 and 8. That is, in the crotch area M, the portion between the side edge of the absorbent body 56 and the second gather elastic member 632 becomes the first portion 60A extending obliquely upward toward the base of the inner thigh of the wearer, and the portion from the second gather elastic member 632 to the side edge of the side flap 60 becomes the second portion 60B extending obliquely downward along the inner thigh. Here, the first portion 60A is lifted up by the first gather elastic member 631 more strongly than the second portion 60B, making it difficult to move, and the second portion 60B, located at a position more than a certain distance away from the first gather elastic member 631, adheres closely to the inner thigh while using the first gather elastic member 631 as support. Therefore, even if the second portion 60B moves following the movement of the leg, the portion between the first gather elastic member 631 and the second gather elastic member 632 deforms and exerts a cushioning effect, so that the movement of the second portion 60B is difficult to be transmitted to the absorbent body 56 via the first portion 60A, and the risk of the side of the absorbent body 56 collapsing can be reduced.

[0074] As shown in the illustrated example, when the absorber 56 has a minimum width portion 52 in the crotch region M and has a widened portion 53 that gradually widens from the minimum width portion 52 to the maximum width portion 54 on the front side and to the maximum width portion 54 on the rear side, if the distance d4 in the width direction WD between the side edge of the minimum width portion 52 of the absorber 56 and the first gathered elastic member 631 is too wide, the portion between the side edge of the minimum width portion 52 of the absorber 56 and the first gathered elastic member 631 is likely to be largely recessed on the back side, causing body waste to accumulate on the side flap 60 and making it easy for the toes to get caught when worn. It is preferable that the distance d4 in the width direction WD between the side edge of the minimum width portion 52 of the absorber 56 and the first gathered elastic member 631 is 1.1 to 1.5 times, particularly 1.1 to 1.3 times, the second distance d2.

[0075] The structure of the side flap 60 can be appropriately determined, but the illustrated example is preferable because it is simple and has excellent waterproofness and ease of manufacture. That is, the side flap 60 in the illustrated example has a surface nonwoven fabric layer (in the illustrated example, the side portion of the top sheet 30 and the surface portion 61 of the side nonwoven fabric 66) constituting the surface of the side flap 60, a back nonwoven fabric layer (in the illustrated example, the back portion 62 of the side nonwoven fabric 66) constituting the back surface of the side flap 60, gathered elastic members 631 to 633 provided between the surface nonwoven fabric layer and the back nonwoven fabric layer along the front-rear direction, and a liquid-impermeable film layer 64 sandwiched between the surface nonwoven fabric layer and the back nonwoven fabric layer over a range from the base end to a position closer to the tip than the base end. In the illustrated example, a nonwoven fabric-free portion 65 is formed in which the surface nonwoven fabric layer is not present in a part of the width direction WD of the side flap 60 and the liquid-impermeable film layer 64 is exposed, but the surface nonwoven fabric layer may be present over almost the entire width direction WD of the side flap 60, for example, by extending the surface portion 61 of the side nonwoven fabric 66 to the side of the top sheet 30. When the nonwoven fabric-free portion 65 is provided, its width can be appropriately determined, but it is preferably 10 mm or less. If the water-proofing can be ensured only by the surface nonwoven fabric layer and the back nonwoven fabric layer, the liquid-impermeable film layer 64 does not need to be provided between the surface nonwoven fabric layer and the back nonwoven fabric layer. In addition, when the liquid-impermeable film 11 is provided, the liquid-impermeable film layer 64 may be fixed to one or both of the surface nonwoven fabric layer and the back nonwoven fabric layer, or may not be fixed to both, as long as the gathered elastic members 631 to 633 can be fixed and as long as the above-mentioned hollow portion 70h is formed.

[0076] In particular, if there is a portion 65 (including a nearly widthless gap in the surface nonwoven fabric layer) between the first gathered elastic member 631 and the second gathered elastic member 632 where the surface nonwoven fabric layer is not present and the liquid-impermeable film layer 64 is exposed, this portion will have low rigidity, and the portion between the first gathered elastic member 631 and the second gathered elastic member 632 will be particularly susceptible to deformation, which is preferable.

[0077] The portion between the first gather elastic member 631 and the second gather elastic member 632 preferably has low rigidity since this portion exerts the above-mentioned cushioning effect. As shown in the illustrated example, when the portion between the first gathered elastic member 631 and the second gathered elastic member 632 has a three-layer structure of a front nonwoven fabric layer, a back nonwoven fabric layer, and a liquid-impermeable film layer 64 sandwiched therebetween, and the front nonwoven fabric layer and the liquid-impermeable film layer 64 are bonded via a first hot melt adhesive HM1 and the back nonwoven fabric layer and the liquid-impermeable film layer 64 are bonded via a second hot melt adhesive HM2, each of the front nonwoven fabric layer and the back nonwoven fabric layer has a bending resistance, as measured by the 41.5° cantilever method defined in JIS L 1913:2010, of preferably 0.2 to 2.2 mN·cm in the front-rear direction LD and 0.05 to 0.5 mN·cm in the width direction WD, and particularly preferably 0.4 to 0.6 mN·cm in the front-rear direction LD and 0.07 to 0.1 mN·cm in the width direction WD. The liquid-impermeable film layer 64 preferably has a bending resistance of 0.006 to 0.05 mN·cm in the longitudinal direction LD and 0.006 to 0.05 mN·cm in the transverse direction WD, as measured by the 41.5° cantilever method defined in JIS L 1913:2010, and more preferably has a bending resistance of 0.006 to 0.02 mN·cm in the longitudinal direction LD and 0.006 to 0.02 mN·cm in the transverse direction WD. The application amount of the first hot melt adhesive HM1 is 1 to 10 g / m 2 , especially 1 to 5 g / m 2 and the application amount of the second hot melt adhesive HM2 is 1 to 10 g / m 2 , especially 1 to 5 g / m 2 It is preferable that:

[0078] 14, when the back body B is placed face down on a horizontal surface and only the outer body 12 is expanded along the flat surface from the natural length state and viewed from above, it is preferable that the acute-angle side crossing angle α between the imaginary line connecting the positions of the side edges of the absorber 56 and the positions of the first gather elastic members 631 and the front-rear direction LD is 15 to 40 degrees, the acute-angle side crossing angle γ between the imaginary line connecting the positions of the adjacent third gather elastic members 633 and the front-rear direction LD is 50 to 90 degrees, and the acute-angle side crossing angle β between the imaginary line connecting the positions of the first gather elastic members 631 and the positions of the second gather elastic members 632 and the front-rear direction LD is larger than α and smaller than γ, because the above-mentioned cushioning effect is more excellent. It is more preferable that the angle α is 25 to 35 degrees. It is more preferable that the angle γ is 55 to 70 degrees. It is more preferable that β is about 1.3 to 1.7 times α.

[0079] The fixed portion 67 in the side non-stretchable region 70 may be indirectly fixed to the back portion 62 of the side nonwoven fabric 66 (in the illustrated example, the liquid-impermeable film layer 64 is interposed between the front portion 61 and the back portion 62) or directly fixed. The fixed portion 67 may be formed by at least one of hot melt adhesive and material welding (heat sealing, ultrasonic sealing, etc.). The fixed portion 67 in the illustrated example is assumed to be integrally welded to the front portion 61 and the back portion 62 of the side nonwoven fabric 66 and the liquid-impermeable film layer 64 located therebetween. The side non-stretchable region 70 may be provided in a position where a part of it overlaps with the waist-surrounding stretchable region of the exterior body 12, but it is preferable that the entire side non-stretchable region 70 overlaps with the waist-surrounding stretchable region of the exterior body 12. The flat gather region 80 (the portion of the side flap 60 that stretches together with the gather elastic members 631 to 633) is the entire region between the front and rear side non-stretchable regions 70.

[0080] As long as the gathered elastic members 631-633 are provided between the front nonwoven fabric layer and the back nonwoven fabric layer (and therefore not in the nonwoven fabric absent portion 65), they can be provided on the front side of the liquid impermeable film layer 64 built into the side flap 60 as shown in Fig. 3, or on the back side (not shown). As long as the contractile force of the gathered elastic members 631-633 is not applied to the side non-stretchable region 70, the ends thereof may be present in a state where they have contracted to their natural length and are not fixed to the surroundings.

[0081] The position of the liquid-impermeable film layer 64 in the side flap 60 can be determined as appropriate. If waterproofness is a priority, it is preferable for it to extend across the entire width of the side flap. However, in order to ensure flexibility of the side edges of the side flap, it is also preferable not to have the liquid-impermeable film layer 64 in the side edge portion (for example, from between the most lateral third gathered elastic member and the second adjacent third gathered elastic member to the side edge of the side flap).

[0082] The surface nonwoven fabric layer and the back nonwoven fabric layer may be provided with a nonwoven fabric different from that of the top sheet 30 and the cover nonwoven fabric layer 13, but are also preferably formed with the same nonwoven fabric as the top sheet 30 and the cover nonwoven fabric layer 13. That is, in the illustrated example, the top sheet 30 is made of a nonwoven fabric, and is configured so that both sides in the width direction WD extend from the side edges of the absorbent body 56, and a side nonwoven fabric 66 that also serves as the cover nonwoven fabric layer 13 is provided on the back side of the absorbent body 56, and both sides in the width direction WD extend laterally from the side edges of the absorbent body 56, and further, the side end portions of this side nonwoven fabric 66 are folded back, and the tip of the folded back portion 66r is separated from the tip of the top sheet 30. Also, a liquid-impermeable film 64 is provided at least from between the folded back portion 66r of the nonwoven fabric 66 to between the top sheet 30 and the nonwoven fabric 66. As a result, a back nonwoven fabric layer including the back portion 62 is formed by the parts other than the folded-back portions 66r of the side nonwoven fabric 66, a front nonwoven fabric layer is formed by the folded-back portions 66r of the side nonwoven fabric 66 and the parts of the top sheet 30 extending laterally of the absorbent body 56, and a nonwoven fabric-free portion 65 is formed by the parts where the folded-back portions 66r of the side nonwoven fabric 66 are separated from the top sheet 30. In this way, by forming the front nonwoven fabric layer on the absorbent body 56 side of the nonwoven fabric-free portion 65 of the side flap 60 by the top sheet 30 and forming the rest by the folded-back portions 66r of the side nonwoven fabric 66, it is possible to provide the nonwoven fabric-free portion 65 without cutting the material, and the structure is very simple and easy to manufacture.

[0083] In this case, it is preferable that the liquid-impermeable film layer 64 built into the side flap 60 extends from one side flap 60 through the back side of the absorbent body 56 to the other side flap 60 as shown in Figures 3 and 4, since this not only ensures the water-proofing of the side flap 60 but also the water-proofing of the back side of the absorbent body 56 as a whole, but it is also possible to provide the liquid-impermeable film layer 64 built into the side flap 60 and the liquid-impermeable film 11 covering the back side of the absorbent body 56 separately. In the latter case, the material of the liquid-impermeable film layer 64 built into the side flap 60 and the material of the liquid-impermeable film 11 covering the back side of the absorbent body 56 may be the same or different (for example, a material with lower rigidity).

[0084] In the side flap 60, at least one of hot melt adhesives applied by various application methods and material welding fixing means such as heat sealing and ultrasonic sealing can be used to bond adjacent layers in the thickness direction and fix the gathered elastic members 631-633 sandwiched therebetween. If the entire surfaces of adjacent layers on the front and back sides of the gathered elastic members 631-633 are bonded together, flexibility is lost, so it is preferable that the parts other than the adhesive parts of the gathered elastic members 631-633 are not bonded or are weakly bonded. In the illustrated example, hot melt adhesive is applied only to the outer peripheral surfaces of the gathered elastic members 631-633 by an application means such as a comb gun or a surwrap nozzle, and the gathered elastic members 631-633 are sandwiched between adjacent layers on the front and back sides, so that the gathered elastic members 631-633 are fixed to adjacent layers on the front and back sides and the layers adjacent to the front and back sides of the gathered elastic members 631-633 are fixed to each other only by the hot melt adhesive applied to the outer peripheral surfaces of the gathered elastic members 631-633. When there is an end portion of a nonwoven fabric or sheet separated from the gathered elastic members 631-633, such as the end portion of the top sheet 30 in the illustrated example, a separate hot melt adhesive (first hot melt adhesive HM1 in the illustrated example) can be applied to secure this end portion.

[0085] The side nonwoven fabric 66 may be 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 may be treated with a water repellent agent such as silicone as necessary. The fiber basis weight is 10 to 30 g / m. 2 3 and 4, as can be seen from the fact that the surface nonwoven fabric layer on the proximal side of the nonwoven fabric-free portion 65 is formed by the top sheet 30, it is also possible to make the materials of the surface nonwoven fabric layer and the back nonwoven fabric layer partially different, and it is also possible to make the materials of the surface nonwoven fabric layer and the back nonwoven fabric layer different.

[0086] (Compression section) In order to improve the shape retention of the absorbent body 56, a compressed portion can be provided by compressing the absorbent body 56 in the thickness direction. The compressed portion of the absorbent body 56 may be formed by subjecting only the absorbent body 56 to embossing or the like without heating or with heating, but the compressed portion 51 may also be formed including the absorbent body 56 and other laminated members by embossing the absorbent element 50 (i.e., together with the packaging sheet 58) and the inner body 200 in a laminated state. The compressed portion 51 is preferably provided in a continuous lattice pattern as shown in Figures 10 and 11, or in a dot pattern scattered at intervals (not shown).

[0087] The dimensions and number of the compressed portions 51 can be determined as appropriate, but when the compressed portions 51 have a bottom surface and side surfaces, the depth 51h of the compressed portions 51 is preferably 1 to 5 mm, and the ratio of the bottom surfaces of the compressed portions 51 to the surface of the absorbent element 50 is preferably 5 to 25%. When the compressed portions 51 are formed in a pattern in which they are spaced apart, the area of ​​the bottom surfaces of the compressed portions 51 can be determined as appropriate, but is preferably 5 to 15 mm. 2The shape of the bottom surface of the compressed portion 51 may be one or more types selected from appropriate shapes such as a circle, an ellipse, a polygon, a rectangle, a rectangle with rounded corners (two parallel lines of equal length and two semicircles), etc. The pattern in which the compressed portions 51 are scattered at intervals includes not only regular patterns such as a staggered pattern or a matrix pattern, but also irregular patterns such as a lattice pattern.

[0088] In particular, when the compressed sections 51 are arranged in a continuous grid pattern, the pulp fibers and superabsorbent polymer particles that make up the absorbent body 56 are constrained within the unit frame 51f (see Figure 11) consisting of the compressed sections 51, thereby preventing the absorbent body 56 from twisting or cracking.

[0089] When the compressed portions 51 are provided in a grid pattern, the width 51w of the groove-shaped compressed portions 51 (the width of the bottom of the compressed portions formed in the absorbent element 50) can be determined as appropriate, but in general, it is preferable that it be approximately 1 to 3 mm.

[0090] The thickness 51t of the compressed portion 51 can be determined as appropriate, but in normal cases, it is preferable that the thickness 51t be 15 to 35% of the maximum value of the thickness 50t of the absorbent element 50.

[0091] The shape of the unit frame 51f is not particularly limited, and may be a substantially square shape as in the illustrated example, a substantially rhombus (excluding a square), a substantially rectangular shape, a substantially triangular shape, or any other polygonal shape, such as. Also, as long as the compression section 51 is arranged in a lattice pattern, unit frames 51f of different shapes may be included.

[0092] One preferred pattern of the lattice-like compressed portion 51 is a diagonal lattice pattern consisting of first portions 51a extending in a direction inclined at 40 to 50 degrees clockwise with respect to the front-rear direction LD in plan view and second portions 51b extending in a direction inclined at 40 to 50 degrees counterclockwise with respect to the front-rear direction LD in plan view, as shown in the example of Fig. 10 and Fig. 11. In this case, the shape of the unit frame 51f is approximately rhombus.

[0093] The dimensions of the unit frame 51f can be determined as appropriate, but if they are too large, the effect of improving rigidity will be poor, and if they are too small, they will be too hard. Therefore, in normal cases, it is preferable that the dimension 51x of the unit frame 51f in the width direction WD is about 15 to 20 mm. Also, it is preferable that the dimension 51y of the unit frame 51f in the front-rear direction LD is about 15 to 20 mm.

[0094] The compressed portion 51 may be formed over the entire absorbent element 50 or over only a portion of it.

[0095] <Explanation of terms used in the specification> As used herein, the following terms have the following meanings unless otherwise specified in the specification.

[0096] The "front-rear direction" refers to the direction indicated by the symbol LD in the drawing (longitudinal direction), and the "width direction" refers to the direction indicated by the symbol WD in the drawing (left-right direction), with the front-rear direction and the width direction being perpendicular to each other.

[0097] "Front side" means the side closest to the wearer's skin when worn, and "back side" means the side away from the wearer's skin when worn.

[0098] "Front" means the side closest to the wearer's skin when worn, and "back" means the side away from the wearer's skin when worn.

[0099] "Elongation rate" refers to the value when the natural length is 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2 times.

[0100] "Gel strength" is measured as follows: 1.0g of superabsorbent polymer is added to 49.0g of artificial urine (a mixture of urea: 2wt%, sodium chloride: 0.8wt%, calcium chloride dihydrate: 0.03wt%, magnesium sulfate heptahydrate: 0.08wt%, and ion-exchanged water: 97.09wt%) and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40℃ x 60%RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

[0101] - "Basis weight" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until it reaches a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment at a temperature of 100°C. Note that pre-drying is not necessary for fibers with an official moisture regain of 0.0%. From the test piece that has reached a constant weight, a sample template (100mm x 100mm) is used to cut out a sample measuring 100mm x 100mm. The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is the basis weight.

[0102] The "thickness" of thick members such as the absorber 56, the absorbent element 50, and the bottom of the compression section 51 is measured using a thickness gauge from Ozaki Manufacturing Co., Ltd. (Peacock, dial thickness gauge, model H (measurement range 0 to 10 mm, measurement area circular terminal with diameter of 10 mm, measurement force approximately 1.7 N, pressure approximately 21.7 KPa)) with the sample and the thickness gauge held horizontally.

[0103] The "thickness" of thin sheets such as nonwoven fabrics was measured using an automatic thickness measuring device (KES-G5 Handy Compression Measurement Program) with a load of 0.098 N / cm 2 , and pressure area: 2cm 2 The measurement is performed automatically under the following conditions.

[0104] The water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resins".

[0105] The water absorption rate is the "time to the end point" when 2g of superabsorbent polymer and 50g of physiological saline are used and the test is performed in accordance with JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymers."

[0106] "Unfolded state" means a flat, unfolded state without contraction (including any contraction, such as contraction due to elastic members) or sagging.

[0107] "Maximum elongation" refers to the maximum elongation in the stretch direction in the stretch region (i.e. the elongation at the elastic limit, which is equal to the elongation in the unfolded state), and is expressed as a percentage of the unfolded length, with the natural length being 100%.

[0108] *Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

[0109] If no specification is given regarding the environmental conditions for a test or measurement, the test or measurement shall be carried out in a test room or equipment under standard conditions (the test location shall be a temperature of 23±1°C and a relative humidity of 50±2%). [Industrial Applicability]

[0110] The present invention can be used in pants-type disposable wearing articles such as the pants-type disposable diaper described above. [Explanation of symbols]

[0111] 11...liquid-impermeable film, 12...outer body, 12A...side seal portion, 12B...rear outer body, 12F...front outer body, 12H...inner sheet layer, 12S...outer sheet layer, 13...cover nonwoven fabric layer, 14...buttocks cover portion, 15...waist lower elastic member, 16...buttocks cover elastic member, 17...waist elastic member, 200...inner body, 201...inner body joint portion, 30...top sheet, 50...absorbent element, 51...compression portion, 52...minimum width portion, 53...widening portion, 54...maximum width portion, 56...absorbent body, 56C...central region, 56S...side region, 58...packaging sheet, 60...side flap, 60A...first portion, 60B...second portion, 61...surface portion, 62...back portion, 631-633...gathered elastic member, 631...first gathered elastic member, 63 2...second gathered elastic member, 633...third gathered elastic member, 64...liquid-impermeable film layer, 65...non-woven fabric portion, 66...side nonwoven fabric, 66r...folded-back portion, 67...fixed portion, 70...side non-stretchable region, 70h...hollow portion, 71...free portion, 73...end portion, 80...flat gathered region, B...back body, F...front body, HM1...first hot melt adhesive, HM2...second hot melt adhesive, HM3...hot melt adhesive, L...middle region, LD...front to back direction, M...crotch portion, T...torso region, U...lower waist portion, W...waist portion, WD...width direction, WO side...waist opening WO, d1...first distance, d2...second distance, d3...third distance, w1...first distance, w2...second distance, w4...third distance, w5...fourth distance.

Claims

1. an exterior body having a front waistband, a back waistband, and side seals formed by joining both side portions thereof; An inner body joined to the middle of the outer body in the width direction so as to extend from the waist portion of the front body through the crotch portion to the waist portion of the back body; a waist opening formed by the front edge of the front body and the rear edge of the back body; leg openings provided on both sides of the interior body, the inner body has an absorbent body that continues from a position in front of the crotch region to a position in back of the crotch region, The waist portion of the front body and the waist portion of the back body have waist stretchable regions provided on at least both sides in the width direction, The waist elastic region incorporates a waist elastic member, contracts in the width direction together with the waist elastic member, and is extensible in the width direction together with the waist elastic member; A pair of side flaps extend from the side edges of the absorbent body to both sides in the width direction on both sides of the inner body, extending in the front-rear direction from an area overlapping the waist-surrounding elastic region of the front body to an area overlapping the waist-surrounding elastic region of the back body, The side flaps each include a side nonwoven fabric extending from the front surface of the side flap through the side edge of the side flap to the back surface of the side flap, and an elongated gathered elastic member provided along the front-to-rear direction between the front surface and back surface of the side nonwoven fabric, The front surface portion and the back surface portion extend over the entire front and rear of the side flap, The front end and the rear end of the side flap do not contract in the front-to-rear direction together with the gathered elastic member, and the front surface portion is fixed directly or indirectly to the back surface portion, forming a side non-stretchable region. The portions of the side flaps between the front and rear side non-elastic regions are flat gathered regions to which the gathered elastic members are fixed, and which contract in the front-to-rear direction together with the gathered elastic members, and which are stretchable in the front-to-rear direction together with the gathered elastic members; Does not have three-dimensional gathers that rise up on the front side A pants-type disposable wearing article; the fixed portion is spaced a first distance from the side edge of the side non-elastic region toward the center in the width direction, A portion between the side edge of the side non-elastic region and the fixed portion has a hollow portion extending over the entire width direction thereof, the side non-elasticated region has a free portion that is not fixed to the exterior body and extends from a side edge of the side non-elasticated region to a position a second distance toward the center in the width direction, the second distance is greater than half the width of the fixing portion and less than half the first distance; the back surface portion located between the free portion and the fixed portion is joined to the waist-surrounding elastic region of the exterior body, contracts in the width direction together with the waist-surrounding elastic member, and is extensible in the width direction together with the waist-surrounding elastic member; The maximum stretch in the width direction of the waist elastic region is 200 to 320%. A pants-type disposable wearing article characterized by:

2. the first distance is 15 to 20 mm; the second distance is equal to or less than one-third of the first distance; The width direction dimension of the fixing portion is 3 mm or more.

2. The pants-type disposable wearing article according to claim 1.

3. When the first distance is w1, the second distance is w2, and the dimension of the fixing portion in the width direction is w3, 0.3(w1+w2) / 2≧w3 is satisfied.

3. The pants-type disposable wearing article according to claim 1 or 2.

4. the second distance is greater than the width dimension of the fixing portion; 3. The pants-type disposable wearing article according to claim 1 or 2.

5. The back surface portion located at the fixing portion is joined to the waist-surrounding elastic region of the exterior body, contracts in the width direction together with the waist-surrounding elastic member, and is also stretchable in the width direction together with the waist-surrounding elastic member.

3. The pants-type disposable wearing article according to claim 1 or 2.

6. the fixing portion is laterally spaced a third distance from a side edge of the absorbent body; the surface portion has an end portion that protrudes from the fixing portion toward the center in the width direction by a fourth distance that is shorter than the third distance and is not joined to an adjacent member on the back side; the fourth distance is greater than half the width of the fixing portion, a back surface portion located between the fixing portion and the side edge of the absorbent body is joined to the waist-surrounding elastic region of the exterior body, contracts in the width direction together with the waist-surrounding elastic member, and is extensible in the width direction together with the waist-surrounding elastic member; 3. The pants-type disposable wearing article according to claim 1 or 2.

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