JP4589945B2 - Pants-type disposable diapers - Google Patents

Description

  The present invention relates to a pants-type disposable diaper in which an exterior sheet is divided into an abdominal side and a back side.

A general pants-type disposable diaper has a joint opening formed on both sides by joining both sides of the front body and both sides of the back body, and a torso opening and a pair of left and right leg openings. It is provided with a formed exterior sheet and an interior body fixed in a range from the abdominal side through the crotch to the back side along the center of the inner surface in the width direction, and the wearer's legs are connected to the torso opening It is to be mounted by inserting it into the leg opening through. The interior body includes a liquid-permeable surface sheet and an absorbent core formed on the outer surface side and formed by a fiber assembly. As the fiber aggregate, those formed by stacking pulp fibers are widely used.
In recent years, a disposable diaper that can be referred to as a two-divided type in which the exterior sheet is divided into the abdomen and the dorsal side has been proposed (see Patent Document 1, for example). ). In the 2-split type, there are few trims (excess disposal parts) when punching out the leg openings at the time of manufacture, each material of the abdominal exterior sheet and the back exterior sheet can be individually selected, and it is easy to pass the foot when wearing There are advantages such as easy to wear (easy to cut) and easy movement of the foot while wearing.
JP 2005-027839 A

In the 2-split type, the shape of the absorbent core strongly affects the degree of freedom of the legs. Therefore, in order to improve the fit around the legs, the middle part of the absorbent core in the front-rear direction can be bundled as long as possible. preferable.
However, in the 2-split type, the area of the adhesion part between the interior body and the abdominal exterior sheet and the back exterior sheet is extremely small, and the force applied to the interior body is concentrated on the adhesion part. If the absorbent core is constricted and the rigidity of the absorbent core is reduced, the absorbent core is deformed and the adhesion between the interior body and the ventral exterior sheet or the back exterior sheet is peeled off as shown in FIG. Or the appearance of the butt sticking out, or the appearance may be deteriorated.
Further, in the two-split type, the area of the exterior sheet that holds the legs around is narrowed and the degree of freedom around the legs is increased, so that gaps are likely to occur around the legs. Therefore, the main problem of the present invention is that these problems in the two-split type There is to solve the point.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The abdomen exterior sheet covering the abdominal side of the wearer's waist and the back exterior sheet covering the back side, with the upper edge of the abdomen exterior sheet and the upper edge of the back exterior sheet aligned, A cylindrical waistline portion formed by joining the joint portions on both side edges in the width direction of the side exterior sheet and the joint portions on both side edges in the width direction of the back side exterior sheet;
The front end is connected to the inner surface in the width direction central portion of the ventral exterior sheet, the rear end is connected to the inner surface in the width direction central portion of the back exterior sheet, and passes from the back side to the ventral side through the crotch portion. And an interior body covering
The interior body includes a liquid-permeable surface sheet, and an absorbent core formed on the outer surface side and formed by a fiber assembly,
In the pants-type disposable diaper in which the ventral side exterior sheet and the back side exterior sheet are not continuous on the crotch side and are separated from each other,
The absorbent core has a front end portion, a rear end portion, and a constricted portion that is narrower than the front end portion and the rear end portion, and is positioned between them.
The length in the front-rear direction of the front end of the absorbent core is L1, the length in the front-rear direction at the overlapping portion of the absorbent core and the ventral exterior sheet is L2, and the length in the front-rear direction of the rear end of the absorbent core is L3. The length in the front-rear direction at the overlapping portion of the absorbent core and the back exterior sheet is L4, the minimum width of the constricted portion is W1, the width of the front end portion of the absorbent core and the width of the rear end portion of the absorbent core is W2. When satisfying the following formulas (1) to (3), in the interior body, in the vicinity of the lower edge of the belly side exterior sheet and the back side exterior sheet, the width direction is more than the middle part in the width direction. Both sides are configured to have higher rigidity,
When the length in the front-rear direction of the constricted portion is L7, L7 is smaller than L3,
On both sides in the width direction of the interior body, belt-shaped barrier cuffs standing on the body side are provided from the front end to the rear end of the interior body along the front-rear direction.
Among the front part, the rear part and the intermediate part between these barrier cuffs, the front part and the rear part are fixed to the top sheet in a folded state so as not to stand up, and the intermediate part is It is not fixed, and is fixed in a state where the elongated elastic elastic member is stretched along the front-rear direction at least in the middle part,
When the front-rear length of the front portion of the barrier cuff is L5 and the front-rear length of the rear portion of the barrier cuff is L6, the following expressions (4) and (5) are satisfied. A pants-type disposable diaper characterized by
70 mm ≦ W1 <W2 ≦ 190 mm (1)
0 mm ≦ L1-L2 ≦ 70 mm (2)
0 mm ≦ L3-L4 ≦ 50 mm (3)
L2 <L5 (4)
L4 <L6 (5)

(Function and effect)
In the pants-type disposable diaper of the present invention, by satisfying the condition of the above formula (1), the width of the absorbent core is sufficiently secured, and by satisfying the conditions of the above formulas (2) and (3), The wide absorbent core front end portion and rear end portion extend sufficiently to the crotch side rather than the lower edges of the ventral exterior sheet and the back exterior sheet. As a result, the highly rigid part of the absorbent core extends sufficiently to the crotch side rather than the lower edge of the abdominal exterior sheet and the back exterior sheet, and the adhesive part between the interior body and the abdominal exterior sheet and the back exterior sheet Even if the force concentrates, the absorbent core becomes difficult to deform, the adhesion between the interior body and the abdominal exterior sheet or the back exterior sheet peels off, or the appearance of the buttocks protrudes and the wearing feeling deteriorates The risk of doing so will be reduced.
In addition, the present invention is intended to increase the rigidity of both side portions of the interior body by using fixing by adhesion or the like required for the front side portion and the rear side portion for raising the barrier cuff. Characteristically, by satisfying the conditions of the above formulas (4) and (5), the inner body in the vicinity of the lower edge of the abdominal exterior sheet and the back exterior sheet, where the force is easily concentrated by the fixed part of the barrier cuff The rigidity of both sides is improved. Therefore, the effects of the present invention described above are further enhanced.

<Invention of Claim 2>
Among the interior bodies, the rigidity is 15 at least in the vicinity of the intersection between both side edges in the width direction of the interior body and the lower end edge of the belly side exterior sheet and in the vicinity of the intersection between both edges in the width direction of the interior body and the bottom edge of the back side exterior sheet. The fiber density of both sides in the width direction of each of the absorbent core front end part and the absorbent core rear end part is higher than the fiber density of the width direction intermediate part. The pants-type disposable diaper according to 1.

(Function and effect)
If the rigidity of at least the portion described in this section of the interior body is within the range described in this section, the above-described effects of the present invention are further enhanced. In addition, the invention described in this section is characterized in that only the both sides in the width direction are densified at least in the front end portion and the rear end portion of the absorbent core. By such high density, the rigidity of both sides of the interior body in the vicinity of the lower edge of the abdominal exterior sheet and the back exterior sheet is easy to concentrate the force without impairing various properties required for the absorbent core. Will improve. Therefore, the effects of the present invention described above are further enhanced.

<Invention of Claim 3 >
Belt-shaped inner barrier cuffs extending in the front-rear direction along both sides in the width direction of the interior body are provided, respectively, and outside the inner barrier cuffs in the front-rear direction along both sides in the width direction of the interior body. Extending strip-shaped outer barrier cuffs are respectively provided, and the inner barrier cuff is an inner attachment portion in which an end portion on one side in the width direction is fixed to an end portion in the width direction of the interior body, The portions other than the inner mounting portion are inner protruding portions protruding from the inner mounting portion, and both end portions in the front-rear direction of the inner projecting portion are fixed to the surface of the face sheet, and the intermediate free portion in the front-rear direction is not fixed. The elongated elastic member along the front-rear direction is fixed in an extended state to at least the tip of the inner free part,
The outer barrier cuff is an outer mounting portion in which an end portion on one side in the width direction is fixed to a rear surface side portion at an end portion in the width direction of the interior body, and a portion other than the outer mounting portion is an outer mounting portion. The outer projecting portions projecting from the outer projecting portions of the outer projecting portions extend from the outer mounting portions to the surfaces of the inner projecting portions of the inner barrier cuffs through the side portions of the inner body cuffs. A root-side portion that extends and is fixed to the surfaces of both ends in the front-rear direction of the inner projecting portion, and a tip-side portion that is folded back outward in the width direction from the tip of the root-side portion and is fixed to the root-side portion. The middle part in the front-rear direction is an unfixed outer free part, and an elongated elastic member along the front-rear direction is fixed in an extended state at least at the tip of the outer free part.
The pants-type disposable diaper according to claim 1 or 2 .

(Function and effect)
In the invention described in this section, the barrier cuff is formed in an inner and outer double, and the front and rear ends of the outer barrier cuff are not folded back, and the front and rear ends of the inner barrier cuff are not folded back. This is characterized in that the portion is folded outward in the width direction, and the outer attachment portion of the outer barrier cuff is disposed on the back side portion of the interior body. If the outer mounting portion of the outer barrier cuff is located on the back side of the interior body, the outer barrier cuff rises so as to open outward in the width direction in the middle portion in the front-rear direction and comes into contact with the surface around the leg. , Improve fit. Furthermore, the fixing portions at both ends in the front-rear direction in the inner protruding portion are not folded back, and the fixing portions at both ends in the front-rear direction in the outer protruding portion are folded back outward in the width direction, so that the inner and outer barrier cuffs on the inner and outer barrier cuffs The separated state between the free parts is maintained, and the inner and outer barrier cuffs stand up at a wide interval, and each fits around the leg, so that the leakage preventing property is excellent. That is, the barrier cuff having a shape that is excellent in standing and easily touches the skin is doubly fitted at a separated position, so that excrement can be prevented from leaking.

  As described above, according to the present invention, it is difficult for the absorbent core to be deformed, the adhesion between the interior body and the abdominal exterior sheet or the back exterior sheet is peeled off, the appearance of the buttocks protrudes and the wearing feeling is deteriorated. Advantages such as reduction of the risk of causing are brought about.

Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.
<First Embodiment>
1 to 9 show an example of a pants-type disposable diaper according to the present invention. In FIG. 1, “front-rear direction” means a direction connecting the abdomen and the back side, “width direction” means a direction orthogonal to the front-rear direction, and “up-down direction” means a waistline direction. It means a direction orthogonal to each other, in other words, a direction connecting the waist opening WO side and the crotch side.
This pants-type disposable diaper 10 has a ventral exterior sheet 12F that covers the abdominal side of the wearer's waist and a back exterior sheet 12B that covers the back side, and both side edges of the abdominal exterior sheet 12F in the width direction. The joining portion 12A and the joining portions 12A on both side edges in the width direction of the back exterior sheet 12B are joined by heat sealing, ultrasonic welding, or the like to form a cylindrical waistline portion 12. When the backside exterior sheet 12B extends below the joining portion 12A as in the illustrated embodiment, the backside sheet is subjected to processing such as heat sealing integrally in the vertical range including up to this portion. The extension weld part 12E can be provided in the extension part 14. FIG. By providing the extended welded portion 12E, it is possible to prevent the second elongated elastic elastic member 16 from being pulled in the backside extended portion 14 described later. In this case, considering the ease of breakage of the side portion, the joining portion 12A is generally composed of a collection of small welded portions, and is generally a joining pattern having a low ratio of the welding area in the joining portion 12A. Since it is not necessary to consider the ease of tearing in the welded portion 12E, the second elongated elastic elastic member 16 is surely welded and fixed by increasing the ratio of the welded area of the welded pattern to the welded portion 12A. May be. Further, the extended welded portion 12E can be welded by a curved line at the edge of the collar cover portion 14C, and the second elongated elastic elastic member 16 of the collar cover portion 14C can be prevented from being pulled.
In addition, the front end of the interior body 20 is connected to the inner surface of the waist portion 12F in the width direction center portion of the abdominal exterior sheet 12F by a hot melt adhesive or the like, and the interior body is connected to the inner surface of the back side exterior sheet 12B in the width direction center portion. The rear end portions of 20 are connected by a hot melt adhesive or the like, and the abdominal side exterior sheet 12F and the back side exterior sheet 12B are not continuous on the crotch side and are separated. This separation distance Y can be about 150 to 250 mm.
As can be seen from FIGS. 7 and 8, the upper opening of the waistline portion 12 becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the waistline portion 12 and the interior body 20 on both sides in the width direction of the interior body 20. The portions surrounded by the side edges are leg openings LO through which the legs pass. In a state where each joint 12A is peeled off and developed, an hourglass shape is formed as shown in FIG. The interior body 20 extends from the back side through the crotch part to cover the abdomen side, and is a part that receives the excrement and absorbs and holds the liquid, and the waistline part 12 holds the interior body 20. This is the part that supports the wearer.

(Exterior sheet)
As shown in FIGS. 4 and 5, the abdominal exterior sheet 12 </ b> F and the back exterior sheet 12 </ b> B are formed by laminating two sheets S <b> 1 and S <b> 2 such as non-woven fabrics. , S2 are provided with elongated elastic elastic members 15 to 19 such as rubber thread at a predetermined extension rate. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. Further, as the elongated elastic elastic members 15 to 18, 19T, and 19U, synthetic rubber or natural rubber may be used. Hot melt bonding, heat sealing, or ultrasonic bonding can be used for bonding the sheets S1 and S2 of the exterior sheets 12F and 12B and fixing the elongated elastic members 15 to 19 sandwiched therebetween. If the entire surface of the exterior sheets 12F and 12B is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.
More specifically, the back-side exterior sheet 12B includes a back-side main body portion 13 that occupies the same vertical range as the joint portion 12A, and a back-side extension portion 14 that extends below the back-side main body portion 13. Have. The back side extension part 14 has the width direction center part 14M which overlaps with the absorptive main body 20, and the collar part cover part 14C extended to the both sides.

The shape of the dorsal extension 14 can be determined as appropriate, but in the illustrated example, the upper end of the dorsal extension 14 has the same width as the dorsal body 13 and extends below the dorsal body 13. The width is narrowed as the lower side approaches the crotch side. A portion having the same width as that of the back-side main body 13 can be omitted. If comprised in this way, the edge 14e of the width direction outer side of the buttock cover part 14C will come in the shape of a straight line or a curve which approaches the absorptive main body 20 side as it approaches the crotch side, and covers the buttock part. Easy shape.
Although the dimension of the back side extension part 14 can be determined suitably, as shown in FIG. 6, the width direction length 14x of the collar part cover part 14C (the edge 14e on the width direction outer side of the collar part cover part 14C and the absorbent main body 20) It is more preferable that the maximum distance in the width direction with respect to the side edge is 80 to 160 mm, and the length 14y (extending length) in the vertical direction of the collar cover portion 14C is 30 to 80 mm. Further, assuming that the area of a quadrangle determined by the widest part in the width direction and the widest part in the vertical direction is S, the area of the back side extension part 14 is 20 to 80% of S, In particular, it is preferable that the content is about 40 to 60% because the outer appearance and wearing feeling of the buttocks are excellent.

The back body 13 can be conceptually divided into an upper end (waist part) W and a lower part U below the upper part in the vertical direction, and the range varies depending on the size of the product. The vertical length of the upper end W can be 15 to 80 mm, and the vertical length of the lower portion U can be 35 to 220 mm.
A plurality of back-side waist elastic elastic members 17 are vertically spaced at the upper end (waist) W of the back-side main body 13 so as to be continuous over the entire width direction and at a predetermined extension rate. It is fixed in a stretched state along the width direction. Moreover, about the 1 or several arrange | positioned in the area | region adjacent to the lower part U of the back side main-body part 13 among the back side waist part elastic elastic members 17, you may overlap with the absorption core 20. Alternatively, it may be provided on both sides in the width direction except for the central portion in the width direction that overlaps the absorbent main body 20. The back waist elastic elastic member 17 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, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, an extension ratio 150% to 400%, preferably fixed in particular about 220-320%. Further, it is not necessary for all of the back side waist elastic elastic members 17 to have the same thickness and extension rate. For example, the elastic waist members may have different thicknesses and extension rates at the upper and lower portions of the back waist part. Good. The back waist elastic elastic member 17 can be freely determined with respect to the first and second elongated elastic elastic members 15 and 16 regardless of the size or the expansion rate.
Further, in the lower portion U of the back-side main body portion 13, a plurality of portions are continuous so as to be continuous over the entire width direction at each of the upper side and both sides in the width direction except for the width-direction central portion overlapping the absorbent main body 20. The first elongated elastic elastic members 15 are fixed in a state where they are extended along the width direction at a predetermined extension rate with an interval in the vertical direction.

The first elongated elastic elastic member 15 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, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. the rubber thread ~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, at an extension rate of 200 to 350%, preferably fixed in particular about 240-300%.
Moreover, in the back side extension part 14, except for the width direction center part which overlaps with the absorptive main body 20, it extends so that it may continue to each site | part of the width direction both sides over the whole width direction (at least over the whole collar cover part 14C). In addition, the plurality of second elongated elastic elastic members 16 are fixed in a state where they are extended in the width direction at a predetermined extension rate with a space in the vertical direction.
The second elongated elastic elastic member 16 has a thickness of 155 to 1880 dtex, especially 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 0.1. It is preferable that about ² to 10 thread rubbers with an interval of 5 to 40 mm, particularly 5 to 30 mm, and an elongation ratio of 150 to 300%, particularly 180 to 260%, respectively.

On the other hand, the abdominal exterior sheet 12F is composed of only the abdominal body part basically the same as the back body part 13 of the back exterior sheet 12B (the part occupying the same vertical range as the joint part 12A). It has a rectangular shape extending along the direction, and does not have the back side extension portion 14 like the back side exterior sheet 12B.
That is, among the upper end portion (waist portion) W and the lower portion U of the ventral side exterior sheet (abdominal side main body portion) 12F, the upper end portion W has a plurality of ventral side waist portions so as to be continuous over the entire width direction. The elastic elastic members 18 are fixed in a state where they are extended along the width direction at a predetermined extension rate with a space in the vertical direction. The ventral waist elastic elastic member 18 is preferably as close as possible to the back waist elastic elastic member 17 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

Further, in the lower portion U of the abdominal exterior sheet 12F (abdominal body portion), the width direction center portion overlaps with the absorbent main body 20, and the entire width direction is applied to each portion on the upper side and both sides in the width direction. A plurality of third elongated elastic elastic members 19 are fixed in a state of being stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous. Although the vertical disposition range of the third elongated elastic elastic member 19 may be a part of the lower portion, it is preferable that the third elongated elastic elastic member 19 is substantially the whole (a range in which the expansion / contraction force acts on the whole).
The third elongated elastic elastic member 19 is preferably as close as possible to the first elongated elastic elastic member 15 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

The abdominal exterior sheet 12F in the illustrated form is composed of only a portion that occupies the same vertical range as the joint portion 12A, but, similarly to the back side, a ventral main body portion that occupies the same vertical range as the joint portion 12A; In addition, a configuration including an abdominal-side extension portion extending below the abdominal-side main body portion may be employed. Thereby, the leg periphery shape of the abdominal exterior sheet | seat 12F can be made into the shape fitted along a buttock. In this case, the area of the ventral extension part is preferably 10 to 80% of the area of the dorsal extension part, and more preferably 20 to 50%. If the ventral extension is excessively large, the fit is rather impaired, which is not preferable.
On the other hand, as shown in the figure, the first, second, and third elongated elastic elastic members 15, 16, and 19 are provided on both sides in the width direction except for the central portion in the width direction that overlaps the absorbent main body 20. It is preferable that the interior body and the exterior sheet are not easily peeled off. However, in this form, in addition to the form in which the elastic elastic member exists only on both sides in the width direction, the other side from the one side in the width direction across the absorbent main body 20 The elastic elastic member exists to the side, but the elastic elastic member is cut at the central portion in the width direction overlapping the absorbent main body 20, and the elastic force does not act (substantially equivalent to not providing the elastic elastic member). ) Is also included. In the present invention, the first, second, and third elongated elastic elastic members 15, 16, and 19 are arranged so that the elastic force acts on the entire width direction of the back main body 13 and the back extension 14. A part or all of can be provided across the absorbent main body 20 from one side in the width direction to the other side.

(Interior body)
The interior body 20 can take any shape, but is rectangular in the illustrated form. As shown in FIG. 3, the interior body 20 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 70, and an absorbent element 50 interposed therebetween. On the back side of the liquid-impermeable sheet 70, a crotch part is provided so as to cover the entire back surface of the interior body 20 or to cover the entire portion exposed between the abdominal exterior sheet 12F and the back exterior sheet 12B. The exterior sheet 12M can also be fixed. In addition, an intermediate sheet (second sheet) 40 can be provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Furthermore, in order to prevent excrement from leaking on both sides of the absorption part 20, barrier cuffs 60 and 61 standing on the body side can be provided on both sides of the interior body 20. Although not shown, the constituent members of the interior body 20 can be appropriately fixed to each other by solid, bead or spiral application such as hot melt adhesive. The interior body 20 can also be detachably attached to the exterior sheet 20 using a mechanical fastener or an adhesive material.
In addition, in the width direction both sides of the interior body 20, especially in the vicinity of the intersection between the width direction both side edges of the interior body 20 and the lower end edge of the abdominal exterior sheet 12F and in the vicinity of the intersection of the back side exterior sheet 12B, the interior body 20 When the rigidity (rigidity) is 15 to 50 cN / 50 mm, preferably 20 to 35 cN / 50 mm, the effect of the present invention is further enhanced. On the other hand, for other portions, for example, the intermediate portion in the width direction, considering the flexibility, it is preferable to reduce the rigidity to 5 to 35 cN / 50 mm, preferably 10 to 25 cN / 50 mm. In addition, the range which makes rigidity high is the range of 5-30 mm to the center side from the width direction both-sides edge of the interior body 20 in the width direction, and the interior body 20, the abdominal side exterior sheet 12F, and the back side exterior sheet 12B in the front-back direction. It is preferable to be within 50 mm from the intersection in the front-rear direction (excluding the portion overlapping with the constricted portion 56N of the absorbent core 56).

(Stiffness test)
Stiffness (rigidity) is measured by the following method in accordance with JIS K 7171 (Plastic-Flexural rigidity test method). For the measurement, a Tensilon tester (curvature radius R1 = 5.0 ± 0.1 mm at the tip of the indenter, radius of curvature R2 = 5.0 ± 0.2 mm at the tip of the support plate) was used, and the product 20 of the interior body 20 in the longitudinal direction Measure the bending stiffness. The test piece is prepared by removing the elastic elastic member that affects the measurement from the interior body 20 and cutting it into a rectangle with a diaper longitudinal direction of 80 mm and a diaper width direction of 50 mm. 50 mm in the unit of the flexural rigidity value is the length of the short side of the test piece, and is the width of the test piece bent with the indenter at the time of the test. On the pair of support plates each having a tip portion having an arcuate cross-section, the interval between the tips (upper ends) of both tip portions being 50 mm, arranged in parallel with each other and the height positions of both tip portions being aligned, The test piece is placed so that its longitudinal direction is directed in a direction perpendicular to each plate, and the tip of the indenter is arranged so as to slightly touch the test piece. A load-deflection curve is obtained by lowering the indenter under conditions of a load cell of 5 kg (range 196 cN) and a speed of 30 mm / min. Let the maximum value of the obtained bending stress be a bending rigidity value (cN / 50 mm). In addition, when the site | part used as a measuring object is smaller than the said sampling dimension, it measures with a small scale test piece, and converts it by proportional calculation based on a dimension ratio.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this liquid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .
Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
When the barrier cuffs 60 and 61 are provided, both side portions of the top sheet 30 pass between the liquid-impermeable sheet 70 and the barrier cuffs 60 and 61 to the back side of the absorbent element 50 to prevent liquid penetration. Therefore, it is preferable to adhere to the liquid-impermeable sheet 70 and the barrier cuffs 60 and 61 with a hot melt adhesive or the like. Thereby, the effect that the rigidity of the both sides of the interior body 20 is improved is also obtained.

(Intermediate sheet)
In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent core, an intermediate sheet 40 that is faster than the top sheet 30 and that is normally called “second sheet” can be provided. This intermediate sheet 40 not only improves the absorption performance by the absorption core by quickly transferring the liquid to the absorption core, but also prevents the “reversal” phenomenon of the absorbed liquid from the absorption core, and always dries the top sheet 30. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.
Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.
The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorbent core 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent core 56, or may be within a short length range centered on the region that receives the liquid. When the intermediate sheet 40 goes from the width direction side portion to the back surface side of the absorbent core 56 and is bonded and fixed with a hot melt adhesive or the like, the rigidity of both side portions of the interior body 20 is improved. A typical material of the intermediate sheet 40 is a nonwoven fabric having excellent liquid permeability.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 70 is not particularly limited. For example, an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film is substantially interposed. Non-woven fabrics that ensure liquid impermeability (in this case, a liquid-impermeable sheet is composed of a waterproof film and a non-woven fabric). Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 70.
The liquid-impermeable sheet 70 is preferably extended around both sides of the absorbent element 50 to both sides of the side surface 30 of the absorbent element 50 in order to improve leakage prevention. Thereby, the effect that the rigidity of the both sides of the interior body 20 is improved is also obtained. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.
Further, the inner surface or the outer surface of the liquid-impermeable sheet 70 may be designed by printing or coloring. Further, a printed or colored design sheet, which is a separate member from the crotch outer sheet 12M, may be attached to the outside of the liquid-impermeable sheet 70. Further, an excretion indicator 80 whose color changes due to absorption of the liquid component can be provided inside the liquid-impermeable sheet 70.

(Barrier cuffs)
The barrier cuffs 60 and 61 are belt-like members extending along the both sides of the interior body 20 over the entire front-rear direction, and prevent urine and soft stool that move along the top sheet 30 in the lateral direction and prevent side leakage. It is provided to prevent this.
In the present embodiment, as shown in FIGS. 3 and 4, the barrier cuffs 60 and 61 are provided twice on the left and right sides of the interior body 20. In the state in which the diaper is unfolded, as shown in the figure, the inner barrier cuff 61 rises obliquely from the side of the interior body 20 toward the center in the width direction, and the outer barrier cuff 60 is in the width direction of the inner barrier cuff 61. Provided to stand upright from the side of the interior body 20 on the outside, the base side portion stands obliquely toward the center in the width direction, and the portion on the tip side from the intermediate portion stands obliquely outward in the width direction. To do.

  More specifically, the inner barrier cuff 61 is a belt-like barrier sheet 62 having a length equal to the length in the front-rear direction of the interior body 20 and folded in two in the width direction. A plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction with a gap in the width direction. The elongated elastic elastic member 63 is not fixed to the barrier sheet 62 at the front and rear ends, and is fixed so that the barrier cuff extends and contracts in the middle part. A water-repellent nonwoven fabric or the like can be used as the barrier sheet 62, and a thread rubber or the like can be used as the elongated elastic elastic member 63. When spandex thread rubber is used, the thickness is preferably 420 to 1120 dtex, and more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Although not shown, a waterproof film can be interposed between the barrier sheets folded in two.

  It is preferable to arrange one or two elongated elastic expansion / contraction members 63 at the distal end portion of the inner barrier cuff 61, and it is even more preferable that one or two elongated elastic expansion / contraction members 63 be disposed at an intermediate portion between the distal end portion and the proximal end portion. When the elongated elastic elastic member 63 is present in the intermediate portion, it becomes easy to hit the skin against the surface in the range from the intermediate portion to the distal end portion using this as a fulcrum. The arrangement position of the elongated elastic elastic member 63 in the middle portion is preferably in the range of 30 to 70% of the height of the inner barrier cuff 61 (length in the width direction of the protruding portion). In an infant paper diaper, the height of the inner barrier cuff 61 is preferably about 15 to 35 mm. Therefore, the arrangement range of the elongated elastic stretch member 63 is preferably 5 to 25 mm from the distal end to the proximal end, and is 12 to 18 mm. Is more preferable. When the elongated elastic elastic members 63 are provided in parallel at the front end portion and / or the intermediate portion of the inner barrier cuff 61, the arrangement interval 61d is preferably 2 to 10 mm, and more preferably 2 to 6 mm.

The end of the inner barrier cuff 61 opposite to the folded portion in the width direction is an attachment portion (inner attachment portion) 65 fixed to the back surface of the side edge of the interior body 20. The portion is a protruding portion 66 (a portion on the folded portion side and corresponding to the inner protruding portion) protruding from the mounting portion 65, and both ends in the front-rear direction of the protruding portion 66 are hot melt adhesive on the surface of the surface sheet 30. And a front-rear fixing portion 67 by heat sealing, and a middle portion in the front-rear direction is an unfixed free portion (inner free portion), and an elongated elastic member 63 along the front-rear direction is fixed to the free portion in an extended state. Yes.
The outer barrier cuff 60 also has basically the same structure as the inner barrier cuff 61, but its attachment portion (outer attachment portion) 68 is an attachment portion 65 of the inner barrier cuff 61 on the back side of the interior body 20. A point fixed to the outer surface of the inner barrier cuff 61 on the center side in the width direction, both ends in the front-rear direction of the projecting portion (outer projecting portion) 69 pass through the side portion of the interior body 20 from the mounting portion 68 and become the inner barrier cuff. 61, a base side portion that extends to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66 and is fixed to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66, and is folded back outward in the width direction from the tip of the base side portion. In addition, the point differs from the front end side portion fixed to the base side portion, the arrangement and number of the elongated elastic elastic members 63, and the like.

The number of the elongated elastic elastic members 63 provided in the free part (outer free part) of the outer barrier cuff 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side. The elongated elastic elastic member 63 disposed on the outer barrier cuff 60 has the same thickness and elongation rate as the inner barrier cuff 61, but the thickness is the same as or larger than that of the inner barrier cuff 61, and the elongation rate is the inner barrier cuff 61. The same or lower than that of 61 is preferred.
In addition, the longitudinal length of the front-rear fixing portion 67 of the protruding portions 66, 69 is preferably formed so that the inner barrier cuff 61 is the same as or shorter than the outer barrier cuff 60, and the elongated elastic cuffs 60, 61 are elongated elastic. The length of the stretchable member 63 fixed in the front-rear direction is preferably such that the inner barrier cuff 61 is the same as or longer than the outer barrier cuff 60. The boundary between the attachment portion 65 and the protruding portion 66 may be the same position on the outer barrier cuff 60 and the inner barrier cuff 61, but the boundary of the outer barrier cuff 60 is the center in the width direction than the boundary of the inner barrier cuff 61. It is preferable to be spaced apart to the side, and the distance is preferably within 10 mm.

It is preferable to form a linear root fixing part by hot melt adhesive or heat sealing at the edge part on the protruding parts 66, 69 side of the attaching parts 68, 65 of the outer barrier cuff 60 and the inner barrier cuff 61. The other fixing parts can be fixed in an appropriate pattern using a hot melt adhesive or the like. The linear root fixing portion is located in the vicinity of the side portion on the front surface side of the interior body 20 (specifically, the position from 0 to 5 mm in the width direction from the side edge, preferably 0 to 3 mm) or the back surface side. preferable. In this case, since the barrier cuff is folded and fixed to the surface side substantially only at both ends in the front-rear direction, in the crotch part where the restriction to the center in the width direction by the front-rear fixing part 67 does not sufficiently act. The outer barrier cuff 60 and the inner barrier cuff 61 both stand up outward in the width direction, and the pocket formed by the inner barrier cuff 61 becomes wider. When the linear root fixing part is positioned over 5 mm in the width direction from the side edge on the surface side, the barrier cuff rises toward the center in the width direction also in the crotch part, and the pocket formed by the inner barrier cuff 61 is narrow Therefore, it is not preferable. When located on the back side, a position of 0 to 20 mm from the side edge of the interior body 20 is appropriate, but may be located beyond 20 mm.
The fixing portions 68 and 65 of the outer and inner barrier cuffs 60 and 61 can be fixed members such as the surface sheet 30, the liquid-impermeable sheet 70, and the absorbent element 50 in the interior body 20. The other barrier cuff can be fixed to the interior body 20 via one barrier cuff.

  In the outer and inner barrier cuffs 60 and 61 configured in this way, the contraction force of the elongated elastic elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends in the front-rear direction among the protruding parts 66 and 69 do not stand up. However, only the free part stands up against the body side as shown in FIG. 3. In particular, when the attachment portions 68 and 65 are positioned on the back surface side of the interior body 20, the outer and inner barrier cuffs 60 and 61 stand up so as to open outward in the width direction at and around the crotch portion. The barrier cuffs 60, 61 come into contact with the legs around the surface, and the fit is improved. On the other hand, on both the front and rear sides (abdomen and back) of the crotch portion, the inner and rear barrier cuffs 61 are restricted by the front and rear fixing portion 67 so that the outer and inner barrier cuffs 60 and 61 do not open outward in the width direction. In addition, since the lower half of the outer barrier cuff 60 is also erected in the same manner, it is possible to surely prevent the abdomen and the back from leaking from both sides of the interior body 20. Further, the front and rear fixing portions 67 of the protruding portion 66 of the inner barrier cuff 61 are not folded back, and the front and rear fixing portions 67 of the protruding portion 68 of the outer barrier cuff 60 are folded outward. , 61 is maintained between the inner and outer free parts, and the outer and inner barrier cuffs 60, 61 are securely raised at a wide interval, and each fits around the leg, providing excellent leakage prevention. It will be.

Although the dimensions of the barrier cuffs 60 and 61 can be determined as appropriate, in the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the inner barrier cuff 61 (the length in the width direction of the protruding portion 66 in the unfolded state). ) W5 is 10 to 50 mm, preferably 15 to 35 mm. Standing height of the outer barrier cuff 60 (width direction length of the protruding portion 69 in the unfolded state) W6 is 15 to 60 mm, particularly 20 to 40 mm. Is preferred. Further, the separation distance W4 between the tips in a state where the inner barrier cuff 61 is tilted to the surface of the top sheet 30 is preferably 60 to 170 mm, particularly 70 to 120 mm. Further, it is preferable that the separation distance W3 between the innermost folds when the outer barrier cuff 60 is flatly folded so as to be parallel to the surface of the top sheet 30 is 60 to 190 mm, particularly 70 to 140 mm.
Unlike the illustrated embodiment, only one of the outer and inner barrier cuffs 60 and 61 can be provided.

(Absorption element)
The absorbent element 50 includes an absorbent core 56 and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent core 56. The covering sheet 58 can be omitted.

(Absorption core)
The absorbent core 56 may be a core made of filaments such as cellulose acetate, as well as a core of short fibers such as cotton pulp. It is preferable to disperse and hold superabsorbent polymer particles in the absorbent core 56.

Characteristically, as shown also in FIG. 6, the absorption core 56 is located at the front end portion 56F, the rear end portion 56B, and between these, and is a narrow portion having a narrower width than the front end portion 56F and the rear end portion 56B. 56N, the length in the front-rear direction of the absorbent core front end portion 56F is L1, the length in the front-rear direction at the overlapping portion of the absorbent core 56 and the ventral exterior sheet 12F is L2, and the absorption core rear end portion 56B The length in the front-rear direction is L3, the length in the front-rear direction at the overlapping portion between the absorbent core 56 and the backside exterior sheet 12B is L4, the minimum width of the constricted portion 56N is W1, the width of the front end portion 56F of the absorbent core and the absorbent core When the width of the rear end portion 56B is W2, it is configured to satisfy the following formulas (1) to (3).
70 mm ≦ W1 <W2 ≦ 190 mm (1)
0 mm ≦ L1-L2 ≦ 70 mm (2)
0 mm ≦ L3-L4 ≦ 50 mm (3)
A more preferable range is as follows.
90 mm ≦ W1 ≦ 120 mm (1 ′)
100 mm ≦ W2 ≦ 190 mm (1 ″)
30 mm <L1-L2 ≦ 60 mm (2 ′)
5 mm <L3-L4 ≦ 30 mm (3 ′)

As described above, it is necessary to satisfy these conditions. When W1 and W2 are too narrow, the rigidity of the absorbent core is not sufficiently improved, and when it is too wide, the fitting feeling is deteriorated due to a decrease in fit.
In addition, when the above-described exterior sheets 12F and 12B are composed only of portions that occupy the same vertical range as the joint portion 12A, the interior body 20 and the exterior sheets 12F and 12B intersect at substantially right angles, and the interior body 20 and the exterior sheet Since a large force concentrates on the bonded portions with 12F and 12B, the numerical values of L1-L2 and L3-L4 are preferably 5 mm or more, more preferably 10 mm or more. On the other hand, when the extending portion 14 is provided on the lower side, it is sufficient that L1-L2 and L3-L4 are 0 mm or more as described above.
In addition, when the value is within the above numerical range, the absorbent core 56 does not exist near the attachment portion 65 of the barrier cuffs 60, 61 in the crotch portion. Therefore, the degree of freedom of movement of the barrier cuffs 60, 61 increases, and the barrier cuffs 60, 61 Is easy to open outward in the width direction, and it is easy to hit the skin with the surface, and the followability of the fit surface to the movement of the leg is improved. On both the front and rear sides, the absorbent core 56 on the side of the interior body 20 exists in a sufficient range, so that the standing of the barrier cuffs 60 and 61 is stabilized with this as a base point (fulcrum). A portion extending from the front and rear sides to the crotch portion is a displacement portion in which the barrier cuffs 60 and 61 open outward in the width direction from a posture in which the barrier cuffs 60 and 61 stand up inward in the width direction with reference to both side edges in the width direction. The change in the posture of 60, 61 is supported by the absorption core 56 existing up to the side of the interior body 20, and the overall shape of the barrier cuffs 60, 61 is stabilized. If the constricted part is too large outside the above numerical range, the degree of freedom of the barrier cuffs 60 and 61 becomes too high in the crotch part, and there is a possibility that a gap is easily formed around the leg, and both the front and rear sides of the crotch part However, since there is no base point (fulcrum), the standing of the barrier cuffs 60 and 61 may become unstable. Conversely, if the constricted portion becomes too small, the degree of freedom of the barrier cuffs 60 and 61 is lowered, which is not preferable.

Moreover, it is preferable that the absorption core 56 is configured to satisfy the following formulas (6) and (7).
90 mm ≦ L1 <L3 ≦ 180 mm (6)
40 mm ≦ L2 <L4 ≦ 180 mm (7)
Furthermore, the front-rear direction length L7 of the entire constricted portion 56N is preferably 80 mm or more, and particularly preferably 120 to 260 mm. If the length L7 in the front-rear direction of the constricted portion 56N is too short, the fitting property with respect to the leg periphery is lowered, and the absorbent core 56 prevents the movement of the leg, and if it is too long, it is difficult to ensure the rigidity of the absorbent core 56.

On the other hand, in order to improve the rigidity of both side portions of the interior body 20 in the vicinity of the lower edges of the abdominal exterior sheet 12F and the back exterior sheet 12B, as shown in FIG. 10, the protruding portions 69 of the outer and inner barrier cuffs 60, 61 are provided. 66, the front-rear direction length L5 of the front-side fixing part 67 and the front-rear direction length L6 of the rear-side fixing part are secured long so as to satisfy the following expressions (4) and (5).
L2 <L5 (4)
L4 <L6 (5)

With this configuration, the rigidity of both side portions of the interior body 20 is increased by using the fixing 67 by adhesion or the like required for the front side portion and the rear side portion for raising the barrier cuffs 60 and 61. The rigidity of both side portions of the interior body 20 in the vicinity of the lower edges of the abdominal exterior sheet 12F and the back exterior sheet 12B can be improved. Therefore, the deformation of the absorbent core 56 is further prevented. This relationship is preferably satisfied in both the outer and inner barrier cuffs 60, 61, but may be either. Moreover, it is more preferable if it is comprised so that the following formula | equation (4 ') and (5') may be satisfied.
5 mm <L5 <210 mm (4 ′)
5 mm <L6 <210 mm (5 ′)

Furthermore, the front-rear fixing portion 67 extends to the constricted portion 56N, and overlaps with the constricted portion 56N by 0 to 10 mm, so that the both sides of the inner body 20 near the lower edges of the abdominal exterior sheet 12F and the back exterior sheet 12B. Although it is preferable for improving the rigidity, when priority is given to the stable standing of the barrier cuffs 60 and 61, it is preferable that the front and rear fixing portion 67 does not extend to the constricted portion 56N.
In order to further enhance the effect of the present invention, the fiber density on both sides in the width direction of each of the absorbent core front end portion 56F and the absorption core rear end portion 56B is set higher than the fiber density in the width direction intermediate portion. It is preferable to do this. Specifically, it is preferable to make the thickness of the absorbent core 56 uniform and to increase the basis weight of the fiber assemblies on both sides in the width direction in each of the absorbent core front end portion 56F and the absorbent core rear end portion 56B. The thickness of the absorbent core 56 is 1 to 15 mm, the basis weight in the range 56x of 5 to 30 mm from the side edges in the width direction is 350 to 700 g / m ^2, and the basis weight of the intermediate portion 56 m between these both sides. Is preferably 300 to 600 g / m ^2, and the basis weight of both sides in the width direction is preferably 1.2 to 2.0 times that of the intermediate portion in the width direction. In this case, the blending ratio of the superabsorbent polymer in the absorbent core 56 is about 40 to 70%.
In addition, since the absorption core 56 of this form has the constriction part 56N, even if the whole said range in the width direction both sides of the absorption core 56 is made into a high basic weight part, the flexibility in the crotch part of the interior body 20 is not affected. . Of course, the high basis weight portion may be formed intermittently on both sides in the width direction of the absorbent core 56, particularly in the vicinity of the intersection between the side edges in the width direction of the absorbent core 56 and the lower edges of the exterior sheets 12F and 12B. In this case, the high basis weight portion is preferably formed in the front-rear direction over a range of about 10 to 80 mm, particularly about 20 to 50 mm.

(Superabsorbent polymer particles)
Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.
As the superabsorbent polymer, one integrated with an antibacterial substance can be used. In particular, zeolite particles obtained by substituting some or all of the ion-exchangeable ions in the zeolite with silver ions (hereinafter referred to as antibacterial deodorant zeolite) are contained in the superabsorbent polymer or antibacterial. Antibacterial deodorant superabsorbent polymer particles obtained by adhering deodorant zeolite particles to the surface of superabsorbent polymer particles by static electricity are suitable.
As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, the liquid supplied into the absorption core 56 is liable to cause a so-called reversal that returns to the outside of the absorption core 56.
Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorption core 56, the sticky feeling after liquid absorption can be suppressed effectively.
The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorbent core 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.
If necessary, the superabsorbent polymer particles can adjust the spray density or spray amount in the plane direction of the absorbent core 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorbent core 56 may be provided.

(Enveloping sheet)
When the covering sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
As shown in FIG. 2, the covering sheet 58 may cover only the back surface and side surfaces of the layer in addition to the form for covering the entire absorbent core 56. Although not shown, only the upper and side surfaces of the absorbent core 56 are covered with crepe paper or nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent core 56 is covered with crepe paper or nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials becomes a component of the covering sheet). If necessary, the absorbent core 56 may be sandwiched between two upper and lower sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent the movement of the superabsorbent polymer particles.

(Crotch exterior sheet)
A crotch outer sheet 12M exposed on the outer surface of the product is provided on the back surface side of the inner body 20. As the material of the crotch outer sheet 12M, the same material as the abdominal outer sheet 12F and the back outer sheet 12B can be used, but a material containing a higher-strength material or a deodorant, etc. A material different from the exterior sheet 12F and the back-side exterior sheet 12B may be used. Specifically, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a pointbonded nonwoven fabric, an air-through nonwoven fabric, an air point nonwoven fabric, a spunlace nonwoven fabric, an SMS nonwoven fabric, or the like, each made of fibers such as PP, PP / PE, PP / PET, or the like, or What added the deodorizer etc. to this can be used.
A high body pressure is applied to the crotch outer sheet 12M when sitting. Therefore, a material having a high friction fastness (non-fluffing) property is preferable, and in particular, a material that can be evaluated as “◎” or “◯” in the following friction fastness test is preferably used.
Specifically, the fiber thickness is preferably 1.1 to 5.5 dtex, and if fibers such as spunbond, SMS, point bond, or air-through nonwoven fabric in which fibers are bonded by hot air are used, the fibers are bonded to each other by hot embossing. In general, an evaluation of “◎” or “◯” is obtained because of the strong adhesion. On the other hand, many melt blown nonwoven fabrics with thin constituent fibers and spunlace nonwoven fabrics in which the fibers do not adhere to each other are evaluated as “Δ” or “x”. In order to suppress the fluff of the nonwoven fabric, the surface may be pressed with a smooth press roll in the nonwoven fabric production process, the temperature and pressure of hot embossing may be increased, or the temperature of hot air may be increased.
(Friction fastness test)
The fastness to friction is measured by the following method in accordance with JIS L 0849. That is, a sheet piece for measuring the friction fastness of 250 mm × 25 mm is prepared, and the friction fastness on the outer surface side (the outer surface side of the interior body) of the measurement sheet piece is measured. For example, COLOR FASTNESS RUBING TESTER (manufactured by Tester Sangyo Co., Ltd., Model: AB-301) can be used for measuring the friction fastness. The measurement is performed using a friction tester type II and applying 50 vibrations. The measurement sheet piece obtained as a result of the test is visually compared with the limit sample. Evaluate in stages.
The crotch outer sheet 12M may be a sheet provided with design elements by printing or coloring. When used in combination with the above-described design sheet, it is preferable to dispose the designs so that they do not overlap.
It is preferable to use a stretchable nonwoven fabric as the crotch outer sheet 12M and to extend and paste in the longitudinal direction of the inner body 20 because the fit of the crotch part is improved.
When the crotch outer sheet 12M wraps around from the side in the width direction to the side of the body and is bonded and fixed to the outer surface of the barrier sheet 62 with a hot melt adhesive or the like, the rigidity of both sides of the interior body 20 is improved. In such a form, it is preferable to use a sheet having high rigidity (roughness) as the crotch outer sheet 12M. Specifically, a sheet having a bending resistance measured by the Clark method (JISL1096 C method) and a sum of the MD direction and the CD direction of the sheet of 100 mm or more, preferably 150 mm or more may be used.
In the illustrated example, the crotch outer sheet 12M is sandwiched between the inner body 20 and the abdominal and dorsal exterior sheets 12F and 12B where the abdomen and dorsal exterior sheets 12F and 12B overlap the interior body 20. However, it is also possible to affix them to the outside of the ventral and backside exterior sheets 12F and 12B. The crotch outer sheet 12M is affixed to the back surface of the interior body 20 and the inner or outer surfaces of the abdominal and back-side outer sheets 12F and 12B with a hot melt adhesive or the like.

  The present invention can be applied to a pants-type disposable diaper that is formed in a pants shape in advance.

It is a top view in the state where the diaper was developed showing the inner surface of a disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a top view in the state where a diaper was developed showing only a principal part of a disposable diaper with a size. It is sectional drawing which shows only the principal part of a disposable diaper with a dimension. It is a front view of a product state. It is a rear view of a product state. It is a top view in the state where a diaper was developed showing only a principal part of other disposable diapers with a size. It is a photograph of a conventional example.

  DESCRIPTION OF SYMBOLS 10 ... Interior body, 12 ... Exterior sheet, 12F ... Abdominal side exterior sheet, 12B ... Back side exterior sheet, 13 ... Back side main body part, 14 ... Back side extension part, 15 ... 1st elongate elastic elastic member, 16 ... 2nd elongate elastic expansion-contraction member, 20 ... Interior body, 56 ... Absorption core, 56F ... Absorption core front end part, 56B ... Absorption core rear end part, 56N ... Constriction part.

Claims (3)

The abdomen exterior sheet covering the abdominal side of the wearer's waist and the back exterior sheet covering the back side, with the upper edge of the abdomen exterior sheet and the upper edge of the back exterior sheet aligned, A cylindrical waistline portion formed by joining the joint portions on both side edges in the width direction of the side exterior sheet and the joint portions on both side edges in the width direction of the back side exterior sheet;
The front end is connected to the inner surface in the width direction central portion of the ventral exterior sheet, the rear end is connected to the inner surface in the width direction central portion of the back exterior sheet, and passes from the back side to the ventral side through the crotch portion. And an interior body covering
The interior body includes a liquid-permeable surface sheet, and an absorbent core formed on the outer surface side and formed by a fiber assembly,
In the pants-type disposable diaper in which the ventral side exterior sheet and the back side exterior sheet are not continuous on the crotch side and are separated from each other,
The absorbent core has a front end portion, a rear end portion, and a constricted portion that is narrower than the front end portion and the rear end portion, and is positioned between them.
The length in the front-rear direction of the front end of the absorbent core is L1, the length in the front-rear direction at the overlapping portion of the absorbent core and the ventral exterior sheet is L2, and the length in the front-rear direction of the rear end of the absorbent core is L3. The length in the front-rear direction at the overlapping portion of the absorbent core and the back exterior sheet is L4, the minimum width of the constricted portion is W1, the width of the front end portion of the absorbent core and the width of the rear end portion of the absorbent core is W2. When satisfying the following formulas (1) to (3), in the interior body, in the vicinity of the lower edge of the belly side exterior sheet and the back side exterior sheet, the width direction is more than the middle part in the width direction. Both sides are configured to have higher rigidity,
When the length in the front-rear direction of the constricted portion is L7, L7 is smaller than L3,
On both sides in the width direction of the interior body, belt-shaped barrier cuffs standing on the body side are provided from the front end to the rear end of the interior body along the front-rear direction.
Among the front part, the rear part and the intermediate part between these barrier cuffs, the front part and the rear part are fixed to the top sheet in a folded state so as not to stand up, and the intermediate part is It is not fixed, and is fixed in a state where the elongated elastic elastic member is stretched along the front-rear direction at least in the middle part,
When the front-rear length of the front portion of the barrier cuff is L5 and the front-rear length of the rear portion of the barrier cuff is L6, the following expressions (4) and (5) are satisfied. A pants-type disposable diaper characterized by
70 mm ≦ W1 <W2 ≦ 190 mm (1)
0 mm ≦ L1-L2 ≦ 70 mm (2)
0 mm ≦ L3-L4 ≦ 50 mm (3)
L2 <L5 (4)
L4 <L6 (5)   Among the interior bodies, the rigidity is 15 at least in the vicinity of the intersection between both side edges in the width direction of the interior body and the lower end edge of the ventral exterior sheet and in the vicinity of the intersection points between both side edges in the interior body and the lower end edge of the back exterior sheet. The fiber density of both sides in the width direction of each of the absorbent core front end part and the absorbent core rear end part is higher than the fiber density of the width direction intermediate part. The pants-type disposable diaper according to 1. Belt-shaped inner barrier cuffs extending in the front-rear direction along both sides in the width direction of the interior body are provided, respectively, and outside the inner barrier cuffs in the front-rear direction along both sides in the width direction of the interior body. Extending strip-shaped outer barrier cuffs are respectively provided, and the inner barrier cuff is an inner attachment portion in which an end portion on one side in the width direction is fixed to an end portion in the width direction of the interior body, The portions other than the inner mounting portion are inner protruding portions protruding from the inner mounting portion, and both end portions in the front-rear direction of the inner projecting portion are fixed to the surface of the face sheet, and the intermediate free portion in the front-rear direction is not fixed. The elongated elastic member along the front-rear direction is fixed in an extended state to at least the tip of the inner free part,
The outer barrier cuff is an outer mounting portion in which an end portion on one side in the width direction is fixed to a rear surface side portion at an end portion in the width direction of the interior body, and a portion other than the outer mounting portion is an outer mounting portion. The outer projecting portions projecting from the outer projecting portions of the outer projecting portions extend from the outer mounting portions to the surfaces of the inner projecting portions of the inner barrier cuffs through the side portions of the inner body cuffs. A root-side portion that extends and is fixed to the surfaces of both ends in the front-rear direction of the inner projecting portion, and a tip-side portion that is folded back outward in the width direction from the tip of the root-side portion and is fixed to the root-side portion. The middle part in the front-rear direction is an unfixed outer free part, and an elongated elastic member along the front-rear direction is fixed in an extended state at least at the tip of the outer free part.
The pants-type disposable diaper according to claim 1 or 2.

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