JP2018134273A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily open side flap parts when put on and to soften the texture of side edges of the side flaps.SOLUTION: A part positioned at least in a crotch in each of side flap parts SF has: a base part 71 extending laterally from a body part 10; and a folding part 72 folded to a center side in a width direction WD on the side edge of the base part 71. A part positioned in the middle at least in a back and forth direction LD in the folding part 72 has a bonding part 73 bonded to the base part 71 on the end side of the folding part 72 and the whole side from the bonding part 73 in the folding part 72 becomes a non-bonding part 74 unbonded to the base part 71. On the side positioned on the surface side of the base part 71 and the folding part 72 is provided a side elastic member 75 which passes a position away inward in the width direction WD from the side edge of the non-bonding part 74 and extends in the back and forth direction LD. In a natural length state, as the side elastic member 75 shrinks, the side flap parts SF shrink in the back and forth direction LD.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an absorbent article.

  In the absorbent article, in order to improve the fit to the leg circumference, it is common that the three-dimensional gathers projecting to the body side extend along the front-rear direction on both sides in the width direction on the inner surface. (For example, refer to Patent Documents 1 and 2). By providing such a three-dimensional gather, excrement remains between the compatible body gathers, and in particular, leakage of excrement from the wearer's leg periphery is prevented.

  Also, in order to further prevent leakage around the legs, of the side flaps that extend on both sides in the width direction of the absorbent body, the legs around the legs that extend laterally from the boundary between the root part of the solid gather and the protruding part A flat gather (three-dimensional gather) that elastically fits the leg-around part of the side flap part to the circumference of the wearer's leg by fixing an elongated elastic member extending in the front-rear direction to the part in a stretched state. In general, it is referred to as a “plane”, but it is not a flat surface when mounted and it is needless to say that it is a curved surface along the legs.

  However, the flat gathers of such general absorbent articles have the following problems. That is, the absorbent article is folded at the time of manufacture, a large number of sheets are collected, and the absorbent article is stored in a polybag in a compressed state in the stacking direction before shipment. At this time, the side flap portion having the flat gathers is folded and folded in the polybag in a state where the side flap portion is folded on the surface of the top sheet by a fold along the side edge of the absorbent body, and thus folds are attached. Due to this crease, the side flaps do not open to the side and cannot fit properly around the legs when wearing a diaper, causing a feeling of wearing that worsens or causes side leakage. There was a fear.

  As one method for solving this problem, as described in Patent Document 3, a portion of the side flap portion that is positioned outside the elastic member of the outermost planar gather is placed on the inner portion of the side flap portion. It has been proposed to be folded back and fixed. In this case, the outer portion of the flat gather elastic member will not squeeze inward, but since the side edge of the side flap portion is a thin sheet-like portion, the contact area of the tip (side edge) is small, There is a problem that the touch is hard.

  As another technique, the one described in Patent Document 4 by the present applicant is also known. According to this method, the portion having the elastic member in the side flap portion and the portion on the outer side in the width direction naturally open to warp outward in the width direction with respect to the portion on the center side in the width direction. The outer portion of the flap portion than the elastic member is difficult to bend inward. However, even the one described in Patent Document 4 has a problem that the side edge portion of the side flap portion is a thin sheet-like portion, so that the contact area of the tip (side edge) is small and the touch is hard.

JP 2010-12272 A Japanese Patent No. 3825977 JP 2011-72736 A JP 2012-161557 A

  Therefore, the main problem of the present invention is to easily open the side flap portion when fitting and to fit the leg appropriately and to make the side edge of the side flap soft.

The typical embodiments of the present invention that have solved the above problems are as follows.
<First aspect>
An absorbent body that absorbs and holds excrement, and side flap portions that extend to both sides in the width direction of the absorbent body,
The part located at least between the crotch in each side flap portion has a base portion extending laterally from the main body portion, and a folded portion folded back to the center in the width direction at the side edge of the base portion,
At the part located at least in the middle in the front-rear direction in the folded part, the folded part has a joint part joined to the base part on the tip side of the folded part, and the entire side part of the folded part from the joined part is the base part. It is a non-joined part that is not joined,
A side elastic member that extends in the front-rear direction through a position away from the side edge of the non-joining portion in the width direction is provided on the front side of the base portion and the folded portion,
In the natural length state, the side flap portion is contracted in the front-rear direction as the side elastic member contracts.
An absorbent article characterized by the above.

(Function and effect)
In this aspect, the side elastic member is provided on the front side of the base portion and the folded portion, and in the natural length state, the side flap portion is contracted in the front-rear direction as the side elastic member contracts, so-called flat surface. A gather is formed. Now, when the front side of the base part and the folded part is the front side layer and the back side is the back side layer, the part on the inner side in the width direction from the part having the side elastic member in the front side layer is a non-joint part. It rises from the back side layer while getting up so as to rotate from the inner edge in the width direction. On the other hand, a force acts so that the portion having the side elastic member and the outer portion in the width direction in the front side layer rise together with the inner portion in the width direction, but it is folded at the side end and continues to the back side layer. Therefore, it is deformed so as to approach the center side in the width direction while being prevented from rising. As a result, the side flap part will naturally bend back and open to the widthwise center part of the widthwise side, making it easy to fit a flat gather to the surface around the wearer's legs. To be able to.
In addition, as the portion having the side elastic member in the front layer and the outer portion in the width direction are deformed so as to be closer to the center in the width direction, the side end portion of the back layer is rounded up. The edge is formed by this rounded up hollow part. Therefore, the touch of the side edge of the side flap part is also good.

<Second aspect>
The folded portion is folded to the front side of the base,
Three or more sheet layers are laminated on the base,
Of the base sheet layer, only two layers continue to the folded portion, the folded portion sheet layer is only two layers continuing from the base,
The side elastic member is provided between the two sheet layers of the folded portion,
The absorbent article of a 1st aspect.

(Function and effect)
As can be seen from the forms described later, the side flap portions of general absorbent articles often have three or more sheet layers laminated. When such a side flap part is folded back to form the folded part and the base part, the folded part located on the side in contact with the skin inevitably has a three-layer structure and contracts by the side elastic member. It tends to be hard. On the other hand, when the folded portion is folded to the front side, only two layers of the base sheet layer continue to the folded portion as in this aspect, and the folded layer sheet layer is only two layers continuing from the base portion. If it is, the folded part is hard to be hard.

<Third Aspect>
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
Of the protruding portion, the root portion fixed to the region including the side flap portion, the protruding portion extending from the root portion, both the front and rear direction ends of the protruding portion are fixed in a lying state, and A three-dimensional gather having a non-fixed free part located between the front and rear lodging parts, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the free part;
With
The base has a three-layer structure in which the liquid-impermeable sheet is sandwiched between a gather sheet forming the three-dimensional gather and the exterior sheet,
Of the sheet layer of the base part, only the exterior sheet and the liquid-impermeable sheet continue to the folded part, and the sheet layer of the folded part includes only two layers of the exterior sheet and the liquid-impermeable sheet that continue from the base part. Has become,
The absorbent article of a 2nd aspect.

(Function and effect)
When the folded portion is folded to the front side and the sheet layer of the folded portion is formed in two layers, a liquid-impermeable sheet is present up to the side edge of the side flap portion and excellent in leakage prevention properties as in this aspect. It will be a thing.

<Fourth aspect>
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
Of the protruding portion, the root portion fixed to the region including the side flap portion, the protruding portion extending from the root portion, both the front and rear direction ends of the protruding portion are fixed in a lying state, and A three-dimensional gather having a non-fixed free part located between the front and rear lodging parts, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the free part;
With
The base has a three-layer structure in which the liquid-impermeable sheet is sandwiched between a gather sheet forming the three-dimensional gather and the exterior sheet,
Of the base sheet layer, only the gather sheet and the exterior sheet continue to the folded portion, and the folded layer sheet layer is only two layers of the gather sheet and the exterior sheet continuing from the base,
The absorbent article of a 2nd aspect.

(Function and effect)
When the folded part is folded to the front side and the sheet layer of the folded part is formed in two layers, the liquid-impermeable sheet does not exist in the folded part when it is as in this aspect, and thus the flexibility of the folded part is particularly excellent. It will be a thing.

<Fifth aspect>
The folded portion is folded on the back side of the base,
The absorbent article of a 1st aspect.

(Function and effect)
As in this aspect, by folding the folded part back to the back side of the base part, the edges of the material of the joint part and the side flap are located on the back side and do not come into direct contact with the skin. It becomes.

<Sixth aspect>
The minimum gap in the width direction between the folding position of the side flap and the side elastic member located on the outermost side in the width direction in the side flap is 3 to 10 mm.
The width direction minimum interval between the edge on the inner side in the width direction of the non-joined portion and the side elastic member located on the innermost side in the width direction in the non-joined portion is 3 to 13 mm.
The absorbent article according to any one of the first to fifth aspects.

(Function and effect)
The dimensions of each part may be determined as appropriate, but in the normal case, it is preferably within the scope of this embodiment.

  As described above, according to the present invention, the side flap portion can be easily opened at the time of wearing, and it is possible to appropriately fit around the leg, and the touch of the side edge of the side flap becomes flexible.

It is a top view in the state where the diaper was developed showing the inner surface of a tape type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a tape type disposable diaper. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. (A) 7-7 sectional drawing of FIG. 1, (b) 8-8 sectional drawing of FIG. It is the (a) (c) top view and (b) (d) sectional view of a beltlike sheet. It is sectional drawing which expands and shows the principal part of an unfolded state. It is sectional drawing which expands and shows the principal part of the expansion | deployment state in another form. It is sectional drawing which expands and shows the principal part of the expansion | deployment state in another form. It is sectional drawing which expands and shows the principal part of the expansion | deployment state in another form. It is the schematic which shows the deformation | transformation aspect of a plane gather. It is a top view in the state where the diaper was developed showing the outer surface of a tape type disposable diaper.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, although the dot pattern part in sectional drawing has shown the hot-melt-adhesive which joins each structural member, it replaces with a hot-melt adhesive, uses other adhesives, or welds, such as a heat seal and an ultrasonic seal. Needless to say, the bonding may be performed by using. In the following description, “front-rear direction LD (vertical direction)” means a direction connecting the ventral side (front side) and the back side (rear side), and “width direction WD” is a direction orthogonal to the front-rear direction. (Left-right direction).

  1-7 has shown an example of the tape type disposable diaper. This tape-type disposable diaper includes an absorbent body 56 provided at an intermediate portion in the width direction WD from the ventral part F to the back part B, a liquid-permeable top sheet 30 that covers the front side of the absorbent body 56, and absorption. The body part 10 having the liquid-impermeable sheet 11 covering the back side of the body 56, and the abdominal part F and the back part B are provided on both sides in the width direction of the trunk part of the back part B in the body part 10. Fastening tapes 13 to be connected protrude. The main body 10 includes an end flap portion EF that does not have the absorber 56 and extends to the front side and the rear side of the absorber 56, and a side flap that does not have the absorber 56 and extends to both sides in the width direction WD rather than the absorber 56. Part SF.

  More specifically, in the illustrated example, the entire outer surface of the main body portion 10 is formed by the exterior sheet 12, and the liquid-impermeable sheet 11 is fixed to the inner surface side by an adhesive such as a hot melt adhesive. The absorbent element 50 including the absorber 56, the intermediate sheet 40, and the top sheet 30 are laminated in this order on the inner surface side of the liquid-impermeable sheet 11. The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction LD and the width direction WD than the absorbent element 50, and the side edges of the absorbent element 50 in the top sheet 30. The peripheral edge that protrudes further and the peripheral edge that protrudes from the side edge of the absorbent element 50 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like. This portion becomes a part of the end flap portion EF and the side flap portion SF.

  Further, on both sides of the surface of the main body portion 10 in the width direction WD, three-dimensional gathers 60 and 60 that stand on the skin side of the wearer are provided, and gather sheets 62 and 62 that form the three-dimensional gathers 60 and 60 are provided. It extends so that the whole inner surface of each side flap part SF may be covered from the both sides of the top sheet 30. FIG.

Hereinafter, the material and the characteristic part of each part are demonstrated in order.
(Exterior sheet)
The exterior sheet 12 is provided so that the back surface of the disposable diaper has a touch and appearance like cloth. The exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto. The type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like. When using a nonwoven fabric, the fabric weight is preferably 10 to 50 g / m ² , particularly 15 to 30 g / m ² . The exterior sheet | seat 12 can also be abbreviate | omitted and it can be set as the form which the liquid-impermeable sheet | seat 11 exposes to the back surface of a disposable diaper.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, the liquid-impermeable sheet 11 is substantially made of 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. Non-woven fabrics that ensure liquid impermeability (in this case, liquid impervious sheets are composed of waterproof films and non-woven fabrics). 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 leakage resistance by reducing the voids of the fiber by applying heat or pressure, and applying water-repellent resin or hydrophobic resin or water repellent to waterproof A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 in the illustrated example is slightly wider than the top sheet 30 and narrower than the exterior sheet 12, but the liquid-impermeable sheet 11 is not limited to this. The width can be changed as appropriate, for example.

(Top sheet)
As the top sheet 30, a liquid permeable material such as a porous or non-porous nonwoven fabric or a porous plastic sheet can be used. 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, the spun lace method is a preferable processing method for obtaining flexibility and drapeability, and the thermal bond method is for obtaining bulkiness and softness.

  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.

  Although the top sheet 30 of the illustrated example extends to the side of the side edge of the absorbent body 56, the top sheet 30 is not limited to this, and may extend to the side edge of the exterior sheet 12, and in a form having a three-dimensional gather As long as it extends to the root part of the three-dimensional gather, it may be changed as appropriate, for example, it may extend only to the inner side in the width direction from the side edge of the absorber.

(Intermediate sheet)
An intermediate sheet (also referred to as a second sheet) 40 can be provided between the top sheet 30 and the absorbent element 50 in order to move excrement that has passed through the top sheet 30 to the absorbent body and prevent reversal. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the excrement to the absorber, but also prevents the excretion of the absorbed excrement from reversing from the absorber and touching the surface of the top sheet 30. It is what makes it better. As the intermediate sheet 40, the same material as that of the top sheet 30 can be used. The intermediate sheet 40 can be omitted.

  The material of the intermediate sheet 40 is not particularly limited, and for example, the same material as that of the top sheet 30 can be used. The intermediate sheet 40 is preferably bonded to the top sheet 30. When heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 40 preferably has the same melting point as the top sheet 30. Further, considering the permeation of the solid content in the stool, the fineness of the fiber used for the intermediate sheet 40 is preferably 5.0 to 7.0 dtex, but the liquid residue in the top sheet 30 increases. On the other hand, when the fineness of the fiber used for the intermediate sheet 40 is 1.0 to 2.0 dtex, the liquid residue of the top sheet 30 hardly occurs, but the solid content of the stool is difficult to permeate. Therefore, it is preferable that the fiber of the nonwoven fabric used for the intermediate sheet 40 has a fineness of about 2.0 to 5.0 dtex. The intermediate sheet 40 may be a mesh film in which a large number of pores are provided in a film material such as polyethylene.

  The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent element 50, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

(Absorption element)
The absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool. In the illustrated example, the absorption element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. If the absorbent body 56 is excellent in shape maintainability, the packaging sheet 58 can be omitted as necessary. In this case, the absorbent element 50 is composed only of the absorbent body 56. The absorbent element 50 can be adhered to the inner surface of the liquid-impermeable sheet 11 via an adhesive such as a hot melt adhesive on the back surface.

(Absorber)
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 absorber 56.

  It is preferable that the absorbent body 56 has a rectangular shape as in the illustrated example, and an hourglass shape having a narrow portion narrower than both the front and rear sides in the middle in the front-rear direction, because the fit around the legs is improved.

  In addition, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left and right of the urination port position, but preferably extends to the vicinity of the periphery of the main body 10 in the front-rear direction LD and the width direction WD. In addition, the code | symbol 56X shows the full width of the absorber 56, the code | symbol 10X shows the full width of the main-body part 10, and the code | symbol 10L has shown the full length (it is equal to the full length of a diaper in the illustration form).

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of absorbent article can be used as they are. The particle size of the superabsorbent polymer particles is not particularly limited, but for example, screening using a standard sieve (JIS Z8801-1: 2006) of 500 μm (shaking for 5 minutes), and particles falling under the screen by this screening When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the proportion of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve It is desirable that the proportion of particles remaining on the surface is 60% by weight or more.

  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 particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 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 absorber 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 absorber 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.

(Packaging sheet)
When the packaging 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 SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Three-dimensional gather)
In order to prevent urine and soft stool moving laterally on the top sheet 30 and prevent side leakage, the disposable diaper surface rises from the side of the top sheet 30 to the skin side on both sides in the width direction WD (protrusion) The three-dimensional gather 60 is provided over the entire front-rear direction.

  The three-dimensional gather 60 in the illustrated example has a root portion 65 fixed to a region including the side flap portion SF, a protruding portion 66 extending from the root portion 65, and both ends in the front-rear direction of the protruding portion are fixed in a lying state. And the gathered elasticity 67 fixed in a stretched state in the front-rear direction to at least the distal end portion of the free portion 68. Member 63. The three-dimensional gather 60 is formed by a gather sheet 62 folded at the tip, and a water-repellent nonwoven fabric can be used as the gather sheet 62, and an elongated elastic member such as thread rubber is used as the gather elastic member 63. be able to. As shown in FIG. 1 and FIG. 2, the gather elastic members 63 can be provided in plural numbers, spaced apart from each other, or one each. Although the elongation rate of the part which has the gather elastic member 63 is not specifically limited, 150-350% is preferable in normal cases, and 200-300% is more preferable.

  The root portion 65 of the three-dimensional gather 60 in the illustrated example is provided only in the side flap portion SF, and is joined to the side portion of the liquid-impermeable sheet 11 and the side portion of the exterior sheet 12, but the side flap portion SF. May extend to the side of the region overlapping the absorber 56.

  The projecting portion 66 of the three-dimensional gather 60 has a lying portion at both ends in the front-rear direction LD, but the portion between them is an unfixed free portion 68, and this free portion 68 is a contraction of the gather elastic member 63. It comes to stand by force. When the diaper is mounted, the diaper is mounted on the body in the shape of a boat, and the contracting force of the gather elastic member 63 acts, so that the three-dimensional gather 60 rises and elastically adheres around the leg due to the contracting force of the gather elastic member 63. . As a result, so-called side leakage from around the legs is prevented.

(Side flap part)
Characteristically, as shown in an enlarged view in FIG. 7, each side flap portion SF is folded back toward the center in the width direction WD at the base portion 71 extending laterally from the main body portion 10 and the side edge of the base portion 71. And a folded portion 72. The folded portion 72 has a joined portion 73 joined to the base portion 71 on the distal end side, and the entire side portion of the folded portion 72 is a non-joined portion 74 that is not joined to the base portion 71. . Of the base portion 71 and the folded portion 72, the one located on the front side (the folded portion 72 in the example shown in FIG. 7) extends from the side edge of the non-joint portion 74 to the inside in the width direction WD and extends in the front-rear direction LD. In the natural length state, the side flap portion SF is contracted in the front-rear direction LD as the side elastic member 75 contracts, and a so-called plane is formed around the leg of each side flap portion SF. A gather 70 is formed.

  Of the base portion 71 and the folded portion 72, the one located on the front side (folded portion 72 in the example shown in FIG. 7) is the front side layer 80, and the one located on the back side (the base portion 71 in the example shown in FIG. 7) is the back side layer. As shown in FIG. 11, as shown in FIG. 11, the portion inside the width direction WD from the portion having the side elastic member 75 in the front side layer 80 rotates starting from the inner edge of the non-joint portion 74 in the width direction WD. It rises from the back layer 81 while getting up like this. On the other hand, the portion having the side elastic member 75 in the front side layer 80 and the portion outside the width direction WD act so as to rise together with the portion inside the width direction WD, but are folded at the side ends. Since it continues to the back side layer 81, it rises and is deformed so as to approach the center side in the width direction WD. As a result, the side flap portion SF naturally opens back to the outer side of the width direction WD with respect to the center side portion of the width direction WD, and is easily gathered with respect to the surface around the wearer's leg. 70 can be fit face-to-face. In addition, as the portion having the side elastic member 75 in the front side layer 80 and the portion outside the width direction WD are deformed so as to approach the center side in the width direction WD, the side end portion of the back side layer 81 is rolled up. As a result, the side edge of the side flap portion SF is formed by the rounded hollow portion. Therefore, the touch of the side edge of the side flap portion SF is also improved.

  The side flap portion SF is preferably a laminated structure of a plurality of sheet layers from the base portion 71 to the folded portion 72 as shown in the example, since the side elastic member 75 can be sandwiched between the layers, but only the back side layer 81 is one layer. A single layer structure may be formed over a part or the whole, such as a structure.

  The side elastic member 75 is provided between the gather sheet 62 and the liquid-impermeable sheet 11 as in the example shown in FIG. 7 or between the liquid-impermeable sheet 11 and the exterior sheet 12 as in the example shown in FIG. For example, it can be sandwiched between the front side layers 80. The side elastic member 75 can also be disposed between the front side layer 80 and the back side layer 81.

  The folded portion 72 can be folded back to the back side of the base portion 71 in addition to being folded back to the front side of the base portion 71. When the folded portion 72 is folded to the front side of the base portion 71, three or more sheet layers are laminated on the base portion 71, as shown in the examples shown in FIGS. 8 and 9. Of these, only two layers continue to the folded portion 72, and the sheet layer of the folded portion 72 is only two layers continuing from the base 71, and a side elastic member 75 is provided between the two sheet layers of the folded portion 72. Is one preferred form. That is, the side flap part SF of a general disposable diaper often has three or more sheet layers laminated. When the side flap portion SF is folded back to form the folded portion 72 and the base portion 71, the folded portion 72 located on the side in contact with the skin inevitably has a three-layer structure and is contracted by the side elastic member 75. For this reason, the folded portion 72 tends to be hard. In contrast, when the folded portion 72 is folded back to the front side, only two layers of the sheet layer of the base portion 71 continue to the folded portion 72 as in this aspect, and the sheet layer of the folded portion 72 continues from the base portion 71. When only the layer is formed, the folded portion 72 is not easily hardened.

  In this way, when the folded portion 72 is folded to the front side and the sheet layer of the folded portion 72 is two layers, the base 71 of the side flap portion SF is a gather that forms the three-dimensional gather 60 as shown in FIG. It has a three-layer structure in which the liquid-impermeable sheet 11 is sandwiched between the sheet 62 and the exterior sheet 12, and only the exterior sheet 12 and the liquid-impermeable sheet 11 among the sheet layers of the base 71 are folded back. It is particularly preferable that the sheet layer of the folded-back portion 72 continues to the portion 72 and has only two layers of the exterior sheet 12 and the liquid-impermeable sheet 11 continuing from the base portion 71. In this case, the liquid-impermeable sheet 11 exists up to the side edge of the side flap portion SF, and the leakage preventing property is excellent.

  Further, when the folded portion 72 is folded to the front side and the sheet layer of the folded portion 72 is two layers, the base portion 71 of the side flap portion SF is a gather sheet that forms the three-dimensional gather 60 as shown in FIG. 62 and the exterior sheet 12, the liquid-impermeable sheet 11 is sandwiched, and only the gather sheet 62 and the exterior sheet 12 of the sheet layer of the base 71 continue to the folded-back portion 72. It is particularly preferable that the sheet layer of the folded portion 72 is only two layers of the gather sheet 62 and the exterior sheet 12 continuing from the base 71. In this case, since the liquid-impermeable sheet 11 does not exist in the folded portion 72, the folded portion 72 is particularly excellent in flexibility.

  As shown in FIG. 10, a configuration in which the folded portion 72 is folded back on the back side of the base portion 71 is also one preferable mode. By folding the folded portion 72 to the back side of the base portion 71, the edges of the material of the joint portion 73 and the side flap are located on the back side and do not come into direct contact with the skin, so that the touch of the side flap portion SF becomes even more preferable. . In this case, the base 71 of the side flap portion SF becomes the front side layer 80, and the folded portion 72 of the side flap portion SF becomes the back side layer 81.

  The dimensions of each part may be determined as appropriate, but the side flap part SF is positioned so that the side edge of the side flap part SF is rounded and easily turned up, and the position of the side flap part SF at the outermost side in the width direction WD. It is preferable that the distance d1 in the width direction with the side elastic member 75 is 3 to 10 mm. Further, in order to sufficiently secure the floating height of the front side layer 80 of the non-joining portion 74, the inner edge of the non-joining portion 74 in the width direction WD and the innermost position in the width direction WD of the non-joining portion 74 are positioned. It is preferable that the distance d2 in the width direction with the side elastic member 75 is 3 to 13 mm.

  The maximum lifting height of the front-side layer 80 of the non-joint portion 74 in the side flap portion SF is the inner edge of the non-joint portion 74 in the width direction WD and the side located on the innermost side of the non-joint portion WD in the width direction. It is equal to the minimum distance d2 in the width direction with the elastic member 75, and is 0.1 to 1 times the standing height 60H of the three-dimensional gather 60 (determined as the width of the protruding portion 66 of the three-dimensional gather 60), in particular 0.3 to 0.9. It is preferable to double. By ensuring that the floating height of the front side layer 80 of the non-joint portion 74 in the side flap portion SF is sufficiently high in a range lower than the standing height 60H of the three-dimensional gather 60, the planar gather 70 and the three-dimensional gather 60 can be attached to the wearer. It can be properly fitted around the legs.

  As the side elastic member 75, an elongated elastic member such as rubber thread can be used. As shown in FIGS. 1 and 2, a plurality of each elastic member is provided with an interval of about 3 to 10 mm, and only one is provided. You can also. The elongation ratio of the portion having the side elastic member 75 (planar gathers 70) is not particularly limited, but is usually 150 to 350%, more preferably 200 to 300%.

  The folded portion 72 may be provided only in the middle of the front-rear direction LD including the crotch, in addition to being provided over the entire front-rear direction LD of the main body 10 as in the illustrated example. The length of the folded portion 72 in the front-rear direction LD can be determined as appropriate, for example, about 30 to 60% of the entire length of the main body. The length in the front-rear direction LD of the non-joint part 74 can also be determined as appropriate. The non-joint part 74 may be provided only in the middle of the front-rear direction LD of the folded part 72 in addition to being provided over the entire front-rear direction LD of the folded part 72.

  The width | variety of the folding | turning part 72 can be defined suitably, for example, can be about 14-55 mm. Moreover, the width | variety of the junction part 73 can be determined suitably, for example, can be about 5-15 mm. Furthermore, the width | variety of the non-joining part 74 can be determined suitably, for example, can be about 9-33 mm.

(End flap)
The end flap portion is a portion that extends to the front side and the rear side from the absorber 56 and does not have the absorber 56. The dimensions of the end flap portion EF can be determined as appropriate. For example, the length of the end flap EF in the front-rear direction is preferably about 5 to 20% of the total length L of the main body portion 10. It is appropriate to set it to ˜60 mm, particularly 20 to 50 mm.

(Main body)
The main body 10 is like a general tape-type disposable diaper, and the width of the waist part of the leg abdominal part F and the back part B is wider than the width of the crotch part (in other words, the constriction along the leg part). The width of the diaper is the same as the width of the crotch portion over the entire length as in the illustrated example (in other words, in order to facilitate the formation of the folded portion 72). In this case, a rectangular shape having no constricted portion may be used.

(Fastening tape)
The fastening tape 13 is provided separately on the left and right sides as in the example shown in FIG. 12, and as shown in the example shown in FIG. 2, an attachment portion joined to the back surface of the main body portion in the middle of the width direction WD, A belt-like sheet 90 having protrusions extending from both side edges of the main body portion 10 of the back portion B is provided extending on both sides in the width direction, and both sides of the belt-like sheet 90 in the width direction WD are configured as the fastening tape 13. You can also.

  A connecting portion 13 </ b> A for the ventral side is provided at the tip of the fastening tape 13. As connection part 13A, besides providing a hook material (male material) of a mechanical fastener (surface fastener), an adhesive layer may be provided. The hook material has a large number of engaging protrusions on its locking surface, and the engaging protrusions are (A) letter-shaped, (B) J-shaped, (C) mushroom-shaped, (D ) T-shape, (E) Double J-shape (shape in which J-shape is joined back to back), etc., may be any shape. When the diaper is mounted, the fastening tape is locked at a proper position on the outer surface of the abdominal portion F with the side flap portion SF of the back portion B overlapped on the outside of the side flap portion SF of the abdominal portion F.

  It is preferable that the fastening tape 13 is elastically expanded and contracted at least at a part on the inner side in the width direction from the connecting portion 13 </ b> A because the fit around the trunk is improved. The elongation rate of the fastening tape 13 is not particularly limited, but is preferably about 150 to 250%. The structure of the elastic fastening tape 13 is not particularly limited. For example, as illustrated in FIGS. 6A and 6B, a sheet having elasticity itself such as a rubber sheet or a stretchable nonwoven fabric is used. It is also possible to form at least the elastic stretchable part of the fastening tape 13 by using it. In addition, as illustrated in FIGS. 6C and 6D, two sheet layers 91 such as a nonwoven fabric are bonded together with an adhesive such as a hot melt adhesive, and a perforated sheet is provided between the sheet layers 91. Forming at least an elastic stretchable part of the fastening tape 13 by using an elastic stretchable member 92 such as a strip, a net, or an elongated shape (thread-like or string-like) fixed in a stretched state in the width direction WD. Is preferred. In this way, a plurality of elongated elastic elastic members 92 attached to the sheet base material 91 with a space therebetween are widely used in the technical field of disposable diapers and are not only easy to manufacture but also elongated elastic. There is also an advantage that the shrinkage characteristics of the fastening tape 13 can be easily adjusted by making the thickness, number, extension rate, interval, and material of the elastic members 92 different. As the sheet base 91 in this case, the same one as the exterior sheet 12 can be used. In addition, when an elongated (stretch or string-like) member is used as the elastic elastic member 92, for example, about 5 to 15 members having a thickness of 420 to 1120 dtex can be provided at an interval 92d of 3 to 10 mm.

(Target sheet)
It is preferable to provide a target sheet 12T having a target for facilitating the locking at the locking portion of the fastening tape 13 in the ventral portion F. As the target sheet 12T, when the connecting portion 13A is a hook material, a target sheet 12T can be used in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or a non-woven fabric so that the engagement projection of the hook material is entangled Moreover, in the case of an adhesive material layer, the surface of a sheet substrate made of a plastic film having a smooth surface that is rich in adhesiveness can be used. Further, when the fastening portion of the fastening tape 13 in the ventral portion F is made of a nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a nonwoven fabric and the connecting portion 13A of the fastening tape 13 is a hook material, The target sheet 12T can be omitted, and the hook material can be entangled with the nonwoven fabric of the exterior sheet 12 and locked. In this case, the target sheet 12T may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-“Deployed state” means a state in which a natural length is extended and completely flattened without contraction or sag.
“Elongation rate” means a value when the natural length is 100%.
-"Gel strength" is measured as follows. Add 1.0 g of superabsorbent polymer to 49.0 g of artificial urine and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).
"Artificial urine" is urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97 0.09 wt% mixed, and used at a temperature of 37 degrees unless otherwise specified.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (200 mm × 250 mm, ± 2 mm) is used, and a sample having a size of 200 mm × 250 mm (± 2 mm) is cut out. Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
-The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .
-Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.

  INDUSTRIAL APPLICABILITY The present invention can be used for absorbent articles in general, such as a tape-type disposable diaper as described above, a pants-type disposable diaper, a pad-type disposable diaper, and a sanitary napkin.

  DESCRIPTION OF SYMBOLS 10 ... Main-body part, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Fastening tape, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 63 ... Gather elastic member, 70 ... Flat gather, 71 ... Base part, 72 ... Folded part, 73 ... Joined part, 74 ... Non-joined part, 75 ... Side elastic member, EF ... End flap part, SF ... Side flap part, LD ... Front-back direction, WD ... Width direction, 80 ... Front side layer, 81 ... Back side layer, 13A ... Connection part.

Claims (6)

An absorbent body that absorbs and holds excrement, and side flap portions that extend to both sides in the width direction of the absorbent body,
The part located at least between the crotch in each side flap portion has a base portion extending laterally from the main body portion, and a folded portion folded back to the center in the width direction at the side edge of the base portion,
At the part located at least in the middle in the front-rear direction in the folded part, the folded part has a joint part joined to the base part on the tip side of the folded part, and the entire side part of the folded part from the joined part is the base part. It is a non-joined part that is not joined,
A side elastic member that extends in the front-rear direction through a position away from the side edge of the non-joining portion in the width direction is provided on the front side of the base portion and the folded portion,
In the natural length state, the side flap portion is contracted in the front-rear direction as the side elastic member contracts.
An absorbent article characterized by the above. The folded portion is folded to the front side of the base,
Three or more sheet layers are laminated on the base,
Of the base sheet layer, only two layers continue to the folded portion, the folded portion sheet layer is only two layers continuing from the base,
The side elastic member is provided between the two sheet layers of the folded portion,
The absorbent article according to claim 1. A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
Of the protruding portion, the root portion fixed to the region including the side flap portion, the protruding portion extending from the root portion, both the front and rear direction ends of the protruding portion are fixed in a lying state, and A three-dimensional gather having a non-fixed free part located between the front and rear lodging parts, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the free part;
With
The base has a three-layer structure in which the liquid-impermeable sheet is sandwiched between a gather sheet forming the three-dimensional gather and the exterior sheet,
Of the sheet layer of the base part, only the exterior sheet and the liquid-impermeable sheet continue to the folded part, and the sheet layer of the folded part includes only two layers of the exterior sheet and the liquid-impermeable sheet that continue from the base part. Has become,
The absorbent article according to claim 2. A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
Of the protruding portion, the root portion fixed to the region including the side flap portion, the protruding portion extending from the root portion, both the front and rear direction ends of the protruding portion are fixed in a lying state, and A three-dimensional gather having a non-fixed free part located between the front and rear lodging parts, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the free part;
With
The base has a three-layer structure in which the liquid-impermeable sheet is sandwiched between a gather sheet forming the three-dimensional gather and the exterior sheet,
Of the base sheet layer, only the gather sheet and the exterior sheet continue to the folded portion, and the folded layer sheet layer is only two layers of the gather sheet and the exterior sheet continuing from the base,
The absorbent article according to claim 2. The folded portion is folded on the back side of the base,
The absorbent article according to claim 1. The minimum gap in the width direction between the folding position of the side flap and the side elastic member located on the outermost side in the width direction in the side flap is 3 to 10 mm.
The width direction minimum interval between the edge on the inner side in the width direction of the non-joined portion and the side elastic member located on the innermost side in the width direction in the non-joined portion is 3 to 13 mm.
The absorbent article of any one of Claims 1-5.

Images