JP5118909B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having a strip-shaped inner barrier cuff and an outer barrier cuff extending in the front-rear direction along both sides in the width direction.

In disposable diapers, in order to prevent so-called side leakage, it is well established to provide strip-shaped barrier cuffs extending in the front-rear direction along both sides in the width direction. Various barrier cuffs have been proposed so that the crotch portion has a clean appearance as it is obtained.
In particular, the so-called “clear shape” barrier cuff (see Patent Documents 1 and 2) structure removes the barrier cuff (three-dimensional gather) that has been placed on the existing exterior sheet, and the exterior of both sides of the crotch part. It is excellent in that it is possible to achieve both a refreshing feeling and a leak-proof effect by making the barrier cuff rising from the back side of the interior body lift up the side part of the interior body while preventing the presence of the seat The structure around the legs.
As another technique, it has also been proposed to provide double barrier cuffs in order to obtain a further leakage prevention effect (see Patent Document 6). Further, as a similar technique, a technique having a flat gather in addition to a double barrier cuff has been proposed (see Patent Documents 4 and 5).
JP 2001-340380 A JP 2002-159528 A Japanese Patent Laying-Open No. 2005-065729 JP 2002-291799 A Japanese Patent Laid-Open No. 2004-081369 JP 2000-005230 A JP 2005-027839 A

However, as shown in Patent Document 6, even if double barrier cuffs are provided, the double gathers stand up in an almost overlapping state, so that in actuality, the double leakage prevention effect was not obtained. . Moreover, as shown in Patent Documents 4 and 5, the inner barrier cuff is provided so as to stand on the surface side of the interior body, and the rising start point is positioned on the center side in the width direction from the edge on the interior body side, and the width direction outer side than this. Even if the side part of the interior body that extends to the outside is intended to function as an outside gather, this outside gather is essentially an interior body, so it is difficult to secure a sufficient standing dimension, and even if the standing dimension is forcibly increased. The inner and outer barrier cuffs tend to overlap, and in any case, the leakage prevention effect cannot be sufficiently improved. For this reason, the exterior sheet also requires gathers around the legs (planar gathers), which impairs the clean appearance.
Accordingly, a main object of the present invention is to provide a disposable diaper in which a double barrier cuff fits to the body at each appropriate position and exhibits an excellent leakage prevention effect while being clean in appearance.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An interior body that has a liquid-permeable surface sheet and an absorbent core disposed on the outer surface side thereof, covers the crotch portion to the abdomen side, and a sheet-like exterior body that is attached to the outer surface side of the interior body. In disposable diapers with
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 provided,
The inner barrier cuff is an inner attachment portion in which an end portion on one side in the width direction is fixed to a portion including a surface side portion at an end portion in the width direction of the interior body, and portions other than the inner attachment portion are An inner projecting portion projecting 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 without being folded , and an intermediate portion in the front-rear direction is an unfixed inner free portion, An elongated elastic member extending in the front-rear direction is fixed in an extended state at least at 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.
A disposable diaper characterized by that.

(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. Fold the part outward in the width direction, and place the inner mounting part of the inner barrier cuff on the part including the surface side part of the interior body, and place the outer mounting part of the outer barrier cuff on the back side part of the interior body. It has characteristics.
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.
Characteristically, since the inner mounting portions of the inner barrier cuff are located on both sides of the surface of the interior body, the boundary between the inner mounting portion and the inner projecting portion, which is the starting point, extends from the side edge of the interior body. The inner and outer barrier cuffs not only stand on the body side due to the contraction force of the elastic members of the inner and outer barrier cuffs, but also on the outer side in the width direction of the inner projecting portion of the interior body. The side part stands on the body side, and the side part of the interior body functions as an intermediate barrier between the inner and outer barrier cuffs, and also functions as a spacer for maintaining the inner and outer barrier cuffs in a separated state. .
As a result, in the present invention, the inner and outer barrier cuffs stand up at a wide interval without overlapping, and each fits around the leg. That is, the barrier cuff having a shape that is excellent in standing and easily touches the skin double-fits at a spaced position, so that it exhibits an excellent anti-leakage effect while being refreshed.

<Invention of Claim 2>
In a diaper-deployed state, the boundary between the inner mounting portion and the inner protruding portion is located at a position of 3 to 20 mm from the side edge on the interior body surface side to the center in the width direction, and the outer mounting portion and the outer protruding portion The disposable diaper of Claim 1 located in the site | part from 5-30 mm in the width direction center side from the side edge of the said interior body back side.

(Function and effect)
When the width of the surface side portion of the interior body to which the inner mounting portion is fixed is within the range described in this section, the above-described effect of the present invention is further enhanced.

<Invention of Claim 3>
The inner body is covered with a liquid-impermeable sheet on the outer surface side of the absorbent core, and the liquid-impermeable sheet wraps around both sides of the absorbent core in the width direction and is on the surface sheet side of the absorbent core. The disposable diaper of Claim 2 extended to the position corresponding to the boundary of an inner side attachment part and the said inner side protrusion part.

(Function and effect)
In a disposable diaper, in order to prevent liquid from seeping out from the barrier cuff, it is also proposed to laminate a liquid-impermeable sheet inside the barrier cuff. The liquid-impermeable sheet inside the barrier cuff is formed by extending a liquid-impermeable sheet covering the back side of the absorbent core in the interior body to the inside of the barrier cuff, or laminating a separate sheet in the barrier cuff (Patent Document). 3)). However, if a liquid-impermeable sheet is provided inside the barrier cuff, there is a problem that the material cost increases and the manufacturing process becomes complicated.
According to the present invention, since a small amount of excrement beyond the inner barrier cuff can be prevented at both sides of the interior body that is lifted between the inner and outer barrier cuffs, the liquid does not leak on the side surface side of the interior body as described in this section. By including the permeable sheet, it is possible to effectively prevent a small amount of excreted urine and soft stool from leaking over the inner barrier cuff. In addition, since the liquid-impermeable sheet used as the back side member of the interior body is used, the material cost is small and the manufacturing process can be avoided.

<Invention of Claim 4>
The width of the inner projecting portion is wider than the width of the surface side portion of the interior body to which the inner mounting portion is fixed,
Of the base side portion of the outer projecting portion, the sum of the width of the portion located on the surface side of the interior body in the unfolded state of the diaper and the width of the tip side portion of the outer projecting portion is fixed to the inner mounting portion. Wider than the width of the surface side part of the interior body
The inner barrier cuff and the outer barrier cuff do not contain a liquid-impermeable sheet.
The disposable diaper according to claim 3.

(Function and effect)
As described above, when the liquid-impermeable sheet is extended to the side edge of the interior body, if the side portion of the interior body stands high, air permeability around the legs may be impaired, and the wearer may be uncomfortable after excretion. . On the other hand, by adopting the structure as described in this section, the liquid impervious sheet has low air permeability due to the presence of the liquid-impermeable sheet only on the side part of the interior body that is low in height and hardly obstructs ventilation. The inner and outer barrier cuffs, which are high in height and hinder ventilation, can maintain high breathability. Therefore, high air permeability can be maintained without impairing the above-described bleeding prevention effect.

<Invention of Claim 5>
The exterior body is composed of an abdominal exterior sheet covering the abdominal side of the wearer's waist and a back exterior sheet covering the back side, and aligns the upper edge of the abdominal exterior sheet and the upper edge of the back exterior sheet. In the state, the joint part of the width direction both side edges of the abdominal side exterior sheet and the joint part of the width direction both side edges of the back side exterior sheet are joined to form a cylindrical waistline part,
The interior body has a front end portion connected to the inner surface in the width direction center portion of the belly side exterior sheet and a rear end portion connected to the inner surface in the width direction center portion of the back side exterior sheet.
The disposable diaper of any one of Claims 1-4.

(Function and effect)
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 an exterior two-split type in which the exterior sheet is divided into an abdominal side and a dorsal side has been proposed (see Patent Document 7, for example). reference). With the exterior 2-split type, there are few trims (excess waste parts) when punching out the leg opening at the time of manufacture, and each material of the abdominal exterior sheet and the back exterior sheet can be selected individually. There are advantages such as being easy to wear (easy to cut) because it is easy and easy to move the foot while wearing.
However, in the exterior two-part type, there is a problem in that a gap is likely to be generated around the legs because the area of the exterior sheet that holds down the legs is reduced and the degree of freedom around the legs is increased. Therefore, this invention is suitable for the underpants type disposable diaper of the exterior 2 division type as described in this section.

<Invention of Claim 6>
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 front end and the rear end of the constricted part are located on the crotch side from the lower end of the waistline part,
The minimum width of the constricted portion is 50 to 85% of the width of the front end portion of the absorbent core and the width of the rear end portion of the absorbent core;
The boundary between the inner mounting portion and the inner protruding portion is arranged so as to longitudinally cut the constricted portion in the front-rear direction.
The disposable diaper according to claim 5.

(Function and effect)
In the exterior two-part type, the shape of the absorbent core strongly affects the degree of freedom of the legs. Therefore, it is preferable to bind the middle part of the absorbent core in the front-rear direction in order to improve the fit around the legs.
However, when such a constricted portion is provided, the degree of freedom around the legs is further increased, so that a gap is easily generated around the legs. As described above, the barrier cuff of the present invention is excellent in fitability around the legs, but particularly when the constricted portion is provided in the absorbent core, the inner barrier cuff is configured as described in this section. Since it comes to stand on the line which cuts a constriction part vertically, the improvement of a further fit property comes to be aimed at.

  As described above, according to the present invention, the double barrier cuff fits to the body at each appropriate position, and an excellent leakage prevention effect can be exhibited while being refreshed in appearance. Is brought about.

Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.
1 to 9 show an example of a 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 disposable diaper 10 is a so-called pants-type disposable diaper, and has an abdominal exterior sheet 12F that covers the abdomen and a back exterior sheet 12B that covers the abdomen of the wearer's waistline. The joining portion 12A on both side edges in the width direction of the sheet 12F and the joining portion 12A on both side edges in the width direction of the backside exterior sheet 12B are joined by heat sealing, ultrasonic welding, or the like to form the cylindrical waistline portion 12. It is configured as follows. 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 having an interval of 5 to 40 mm, particularly 5 to 20 mm, and an elongation ratio of 150 to 300%, particularly 180 to 260%, are fixed.

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 in number, thickness, stretch rate, spacing, and vertical arrangement with respect to the back waist elastic elastic member 17, 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. Also, a part of the first, second and third elongated elastic elastic members 15, 16 and 19, or the elastic force acts over the entire width direction of the back side main body part 13 and the back side extension part 14. The whole 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) of the barrier cuff is 15 to 50 cN / 50 mm, preferably 20 to 35 cN / 50 mm, the overall standing shape of the barrier cuffs 60 and 61 as described later is further stabilized. It will be one more thing. 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 is sufficient if it has a property of allowing liquid to permeate, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. 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.

(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 absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorbent core 56.

(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 instead 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 melt blown nonwoven fabric, a point bond nonwoven fabric, an air-through nonwoven fabric, an air point nonwoven fabric, a spunlace nonwoven fabric, an SMS nonwoven fabric, or the like, which is composed of fibers of 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 (not fuzzy) is preferable. Specifically, the fiber thickness is preferably 1.1 to 5.5 dtex, and spunbond, SMS, point bond, and air-through nonwoven fabric in which the fiber is bonded by hot air are suitable.
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 goes 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.

(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. Between them, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals 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. As the barrier sheet 62, a nonwoven fabric excellent in uniformity and concealment, such as a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt blown nonwoven fabric, etc., and if necessary, repelled with silicon or the like. What gave water treatment can be used suitably, and it is preferable that a fiber basis weight shall be about 10-30 g / m < ² >. As the elongated elastic elastic member 63, rubber thread or the like can be used. 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 in the drawings, the overlapping of the barrier sheet 62 folded in two can be prevented from sticking out by applying a solid coating (slot coating) of a hot melt adhesive. In this case, the application amount of the hot melt adhesive is preferably 5 g / m ² or more. Moreover, the barrier cuff (laminated body) has an air permeability measured according to JIS L 1096 of 50 cc / cm ² · sec or more, particularly 100 cc so that excrement held inside the barrier cuff is not seen through. / Cm ² · sec or more, opacity measured according to JIS P 8138 is 40% or more, particularly 50% or more, and water pressure measured according to JIS L 1192 A method is 150 mmH ₂ O or more, particularly 200 mmH _2. It is preferable to be configured to be O or more.

  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.

An end portion of the inner barrier cuff 61 opposite to the folded portion in the width direction is an attachment portion (inner attachment portion) 65 fixed in a range extending from the surface of the side portion of the interior body 20 to the back surface. A portion other than 65 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 on the surface of the topsheet 30. It is fixed by a front / rear fixing part 67 by melt adhesive or heat sealing, and an intermediate part in the front / rear direction is an unfixed free part (inner free part), and an elongated elastic member 63 along the front / rear direction is stretched in this free part. It is fixed.
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. A base side portion that extends to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66 in 61 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.
However, the inner barrier cuff 61 also has a structure in which the tip of the inner protruding portion is folded outward in the width direction, specifically, not more than 1/2 of the height of the inner barrier cuff 61 (width direction length of the protruding portion), If it is preferably 1/3 or less, a structure in which the tip side portion is folded back in the width direction and fixed to the base portion side portion similarly to the outer barrier cuff 61 may be adopted.

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.

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. It is preferable that the linear root fixing portion in the inner attachment portion 65 is located from the side edge on the surface side of the interior body 20 to the center side in the width direction to 3 to 20 mm, particularly 5 to 10 mm. Furthermore, it is preferable that the base fixing portion on the line in the inner attachment portion 65 is arranged so as to cut through the barrier cuff 61 and the constricted portion 50N. Moreover, it is preferable that the base fixing | fixed part on the line in the outer side attachment part 68 is located from 5-30 mm in the width direction center side from the side edge of the back surface side of the interior body 20, especially 10-20 mm. 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. Further, if the arrangement dimension of the base fixing portion of the outer barrier cuff 60 and the inner barrier cuff 61 is out of the above range, for example, the width W7 of the surface side portion of the interior body 20 to which the mounting portion 65 of the inner barrier cuff 61 is fixed is short. If it is too long, the standing height of both side portions of the inner body 20 between the inner and outer barrier cuffs 61, 60 is not preferable. If the length is too long, the inner barrier cuff 61 is not preferable because the width of the portion of the top sheet 30 used for absorption becomes narrow, but the outer barrier cuff 60 has a pocket formed on the back side of the interior body 20. Since there is an advantage of widening, it may be 30 mm or more as long as the stability of standing is not impaired.
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 so as to abut on the body side as shown in FIG. 11. In particular, in the outer barrier cuff 60 in which the attachment portions 68 and 65 are located on the back surface side of the interior body 20, the outer barrier cuff 60 stands up so as to open outward in the width direction at the crotch portion and the vicinity thereof. It comes into contact with the surface. 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 stand up in a state where the free portions are separated from each other.
Characteristically, the inner mounting portions 65 of the inner barrier cuff 61 are located on both sides of the surface of the interior body 20, and the boundary between the inner mounting portion 65 and the inner projecting portion 66, which is the starting point, is the side of the interior body 20. The outer and inner barrier cuffs 60, 61 not only stand on the body side due to the contraction force of the elastic members 63 of the outer and inner barrier cuffs 60, 61 because they are separated from the edge in the center in the width direction. The side portion 20s of the inner projecting portion 66 in the width direction outside the inner projecting portion 66 stands on the body side, and the side portion 20s of the interior body 20 functions as an intermediate barrier between the outer and inner barrier cuffs 60, 61 and The inner barrier cuffs 60 and 61 also function as spacers that maintain the separated state. As a result, the outer and inner barrier cuffs 60, 61 stand up at a wide interval without overlapping each other, and each fits around the leg, and is excellent in leakage prevention.
Similar to the outer and inner barrier cuffs 60 and 61, by fixing the elongated elastic member along the side edge of the interior body 20 in an extended state, the side portions 20s of the interior body 20 are finely gathered at the tip portion. The third barrier cuff standing up and down is formed, but it is rather natural to use the standing action of the outer and inner barrier cuffs 60, 61 without providing such an elastic member. This is preferable because it is easy to function as a spacer that prevents the outer and inner barrier cuffs 60, 61 from overlapping each other by increasing the heel.

  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 preferably 10 to 45 mm, particularly preferably 15 to 35 mm. The standing height of the outer barrier cuff 60 (the length in the width direction 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 the 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. In addition, when the outer barrier cuff 60 is flatly folded so that the outer barrier cuff 60 is parallel to the surface of the top sheet 30, the separation distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

On the other hand, as described above, when the liquid-impermeable sheet 70 is wrapped around from both sides of the absorbent element 50, the liquid-impermeable sheet 70 wraps around both sides in the width direction of the absorbent element 50 and the top sheet 30 of the absorbent element 50. It is preferable to extend to a position corresponding to the boundary between the inner mounting portion 65 and the inner protruding portion 66 on the side. A small amount of excrement beyond the inner barrier cuff 61 can be blocked by the two side portions 20s of the inner body 20 that lifts between the inner and outer barrier cuffs 61, 60, and therefore, on the surface side of the inner body side portion 20s as described in this section. By including the liquid-impermeable sheet 70, it is possible to effectively prevent a small amount of excreted urine and soft stool from leaking over the inner barrier cuff 61. In addition, since the liquid-impermeable sheet 70 used as the back side member of the interior body 20 is used, the material cost is small and the manufacturing process can be avoided.
Furthermore, in this case, the width W5 of the inner projecting portion 66 is wider than the width W7 of the surface side portion of the interior body 20 to which the inner mounting portion 65 is fixed, and the interior of the inner projecting portion 69 is expanded in the diaper of the root side portion. The sum of the width W8 of the portion located on the surface side of the body 20 and the width W9 of the tip side portion of the outer protruding portion 69 is wider than the width W7 of the surface side portion of the interior body 20 to which the inner mounting portion 65 is fixed. It is more preferable to adopt a structure in which the liquid-impermeable sheet 70 is not included in the inner barrier cuff 61 and the outer barrier cuff 60. In such a structure, it is only the side portion 20s of the interior body 20 that is low in height and hardly obstructs ventilation, due to the presence of the liquid-impermeable sheet 70. The inner and outer barrier cuffs 61 and 60 that hinder the air flow can maintain high air permeability. Therefore, high air permeability can be maintained without impairing the above-described bleeding prevention effect.

On the other hand, as shown in FIG. 6, the absorbent core 56 includes a front end portion 56F, a rear end portion 56B, and a constricted portion 56N that is narrower than the front end portion 56F and the rear end portion 56B. And the longitudinal length of the absorbent core front end portion 56F is L1, the longitudinal length of the overlapping portion of the absorbent core 56 and the ventral exterior sheet 12F is L2, and the longitudinal length of the absorbent core rear end portion 56B is L2. L3 is the length in the front-rear direction at the overlapping portion of the absorbent core 56 and the backside exterior sheet 12B, L1 is the minimum width of the constricted portion 56N, and the width of the absorbent core front end 56F and the rear end of the absorbent core When the width of 56B is set to W2, it is preferable to be configured so as to satisfy the following expressions (1) to (4).
70 mm ≦ W1 <W2 ≦ 190 mm (1)
0.5 ≦ W1 / W2 ≦ 0.85 (2)
0 mm ≦ L1-L2 ≦ 70 mm (3)
0mm ≦ L3-L4 ≦ 50mm (4)
A more preferable range is as follows.
90 mm ≦ W1 ≦ 120 mm (1 ′)
100 mm ≦ W2 ≦ 190 mm (1 ″)
0.6 ≦ W1 / W2 ≦ 0.75 (2 ′)
30 mm <L1-L2 ≦ 60 mm (3 ′)
5 mm <L3-L4 ≦ 30 mm (4 ′)

If W1 and W2 are too narrow, the standing of the barrier cuff becomes unstable, and the rigidity of the absorbent core is not sufficiently improved. If 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.
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 posture of 60 and 61 is supported by the absorption core 56 existing up to the side of the interior body 20, and the overall standing shape of the barrier cuffs 60 and 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.

  Further, when the inner and outer barrier cuffs 61, 60 are provided, the front end and the rear end of the constricted portion 50N are located on the crotch side with respect to the lower end of the waistline portion, and the minimum width W1 of the constricted portion 56N is set to the absorption core front end portion 56F. And the width W2 of the absorbent core rear end portion 56B is 50 to 85%, more preferably 60 to 75%, and the boundary between the inner mounting portion and the inner protruding portion in each inner barrier cuff 61 extends the constricted portion 56N in the front-rear direction. It is preferable that the inner barrier cuff 61 is erected on a line that vertically cuts the constricted portion 50N, so that the fit property of the barrier cuff around the leg is further increased.

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.

  The present invention does not have an exterior sheet on at least both side edges of the crotch portion like the above-described two-split pants-type disposable diaper and the pants-type disposable diaper disclosed in Patent Document 2, and the barrier cuff The outer barrier cuff (in the case of double) is suitable for a structure that forms both side edges of the crotch portion. In this case, it is preferable that the area | region where an exterior sheet does not exist in the both-sides edge in a crotch part is 1/4 or more of the full length of a diaper, and it is more preferable that it is 1/3 or more. However, the present invention is not limited to such a structure, and can be applied to other types of pants-type disposable diapers and tape-type disposable diapers.

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 sectional drawing of the crotch part in a mounting state.

Explanation of symbols

  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 (6)

An interior body that has a liquid-permeable surface sheet and an absorbent core disposed on the outer surface side thereof, covers the crotch portion to the abdomen side, and a sheet-like exterior body that is attached to the outer surface side of the interior body. In disposable diapers with
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 provided,
The inner barrier cuff is an inner attachment portion in which an end portion on one side in the width direction is fixed to a portion including a surface side portion at an end portion in the width direction of the interior body, and portions other than the inner attachment portion are An inner projecting portion projecting 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 without being folded , and an intermediate portion in the front-rear direction is an unfixed inner free portion, An elongated elastic member extending in the front-rear direction is fixed in an extended state at least at 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.
A disposable diaper characterized by that.   In a diaper-deployed state, the boundary between the inner mounting portion and the inner protruding portion is located at a position of 3 to 20 mm from the side edge on the interior body surface side to the center in the width direction, and the outer mounting portion and the outer protruding portion The disposable diaper of Claim 1 located in the site | part from 5-30 mm in the width direction center side from the side edge of the said interior body back side.   The inner body is covered with a liquid-impermeable sheet on the outer surface side of the absorbent core, and the liquid-impermeable sheet wraps around both sides of the absorbent core in the width direction and is on the surface sheet side of the absorbent core. The disposable diaper of Claim 2 extended to the position corresponding to the boundary of an inner side attachment part and the said inner side protrusion part. The width of the inner projecting portion is wider than the width of the surface side portion of the interior body to which the inner mounting portion is fixed,
Of the base side portion of the outer projecting portion, the sum of the width of the portion located on the surface side of the interior body in the unfolded state of the diaper and the width of the tip side portion of the outer projecting portion is fixed to the inner mounting portion. Wider than the width of the surface side part of the interior body
The inner barrier cuff and the outer barrier cuff do not contain a liquid-impermeable sheet.
The disposable diaper according to claim 3. The exterior body is composed of an abdominal exterior sheet covering the abdominal side of the wearer's waist and a back exterior sheet covering the back side, and aligns the upper edge of the abdominal exterior sheet and the upper edge of the back exterior sheet. In the state, the joint part of the width direction both side edges of the abdominal side exterior sheet and the joint part of the width direction both side edges of the back side exterior sheet are joined to form a cylindrical waistline part,
The interior body has a front end portion connected to the inner surface in the width direction center portion of the belly side exterior sheet and a rear end portion connected to the inner surface in the width direction center portion of the back side exterior sheet.
The disposable diaper of any one of Claims 1-4. 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 front end and the rear end of the constricted part are located on the crotch side from the lower end of the waistline part,
The minimum width of the constricted portion is 50 to 85% of the width of the front end portion of the absorbent core and the width of the rear end portion of the absorbent core;
The boundary between the inner mounting portion and the inner protruding portion is arranged so as to longitudinally cut the constricted portion in the front-rear direction.
The disposable diaper according to claim 5.

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