JP2016185176A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage at gather joining parts.SOLUTION: The leakage is prevented by a disposable diaper gather in which: gather joining parts 90 are formed by joining free parts 68 of three-dimensional gathers 60 and base end parts in plane gathers 80 at rearward sides of crotch parts in longitudinal ranges corresponding to longitudinal intermediate parts of the front parts 68 of the three-dimensional gathers 60; and an absorber 56 includes narrowed parts 59 for the gather joining parts, the width of which is narrower than both front/back sides at a longitudinal position corresponding to the gather joining parts 90.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a disposable diaper having a three-dimensional gather.

  In disposable diapers, in order to improve the fit to the leg circumference, it is common that solid gathers projecting on the body side extend along the front-rear direction on both sides in the width direction on the inner surface of the diaper. (For example, refer to Patent Document 1). 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.

  The conventional example of the disposable diaper provided with the solid gathers in FIGS. 11-13 is shown. The three-dimensional gather 60 of the disposable diaper has a root portion 65 fixed to the inner surface of the diaper and a protruding portion 66 protruding from the root portion 65, and both end portions 67 and 67 in the front-rear direction of the protruding portion 66. Is bonded and fixed to the surface of the top sheet 30, and the intermediate portion is a non-fixed free portion 68, and an elongated elastic elastic member 63 is fixed in an extended state along at least the front end of the free portion 68 along the front-rear direction. As a result, the free portion 68 rises from the surface of the top sheet 30 by the contraction action of the elastic elastic member 63. 8 and 9, the hatched portion (dotted pattern portion) indicates an adhesive fixing portion. Reference numeral 50 indicates an absorbent element, reference numeral 56 indicates an absorber, reference numeral 11 indicates a liquid-impermeable sheet, and reference numeral 12 indicates. Is an exterior sheet, 40 is an intermediate sheet, 130 is a fastening tape, and 74 is a target tape.

  Further, in order to further prevent leakage around the legs, of the side flap portions SF extending on both sides in the width direction of the absorbent body 56, the side of the side of the base portion 65 and the protruding portion 66 of the three-dimensional gather 60 is located. The elongated elastic elastic member 81 extending in the front-rear direction is fixed to the extending leg surrounding portion 80 in an extended state, whereby the leg surrounding portion 80 of the side flap portion SF is elastic with respect to the wearer's leg circumference. It is also common to use a flat gather 80 (which is called “plane” in the sense of a three-dimensional gather, but it is not a flat surface but a curved surface around the legs when worn). It has become.

  However, the conventional three-dimensional gathers of disposable diapers have the following problems. That is, disposable diapers are folded at the time of manufacture, a large number of sheets are stacked, and are stored in a polybag in a compressed state in the stacking direction before shipment. The three-dimensional gather, whose front and rear ends of the protruding part are bonded and fixed to the top sheet surface, is compressed and stored in a plastic bag in a collapsed state. The part is also lightly attached to the topsheet surface. Due to this, when the diaper is mounted, the free part of the three-dimensional gathering does not stand up properly, and there is a risk of causing side leakage.

  In order to solve this problem, the applicant of the present invention joins the free part of the solid gather and the proximal end part of the flat gather in the front-rear direction range of the diaper including the center of the free part of the solid gather. Thus, a structure in which a gather joint portion is formed has been proposed (see Patent Documents 2 and 3). By providing such a gather joint, the contraction force of the planar gathers acts to raise the three-dimensional gathers, and conversely, the contraction force of the three-dimensional gathers acts to press the planar gathers against the surface around the legs. At this time, the three-dimensional gathers are automatically and appropriately raised, and the three-dimensional gathers and the two-dimensional gathers support each other, so that the fit between them is improved synergistically, and the leakage prevention performance is excellent.

JP 2005-218664 A JP 2011-72658 A JP 2000-316905 A JP 2013-146611 A

  However, when such a gathered joint is provided, the rise of the solid gather is suppressed by the planar gathering, so the rise of the solid gather must be lowered, and it is easy to leak at the gather joint part. was there.

  Then, the main subject of this invention is to prevent the leak in a gathering junction part.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Having a ventral part and a dorsal part extending from the front-rear direction center to the front side and the rear side, respectively;
Having an absorbent body extending from the ventral part to the dorsal part,
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 of the diaper,
The three-dimensional gather includes a root portion fixed to the inner surface of the diaper, a protruding portion protruding from the root portion, a lying portion where both front and rear ends of the protruding portion are fixed in a lying state, and the protruding portion Among them, it has a non-fixed free part located between the front and rear lodging parts, and an elastic elastic member fixed at least at the tip part of the free part in a stretched state in the front-rear direction,
It has side flaps that extend on both sides in the width direction of the absorber,
Each side flap portion has a leg periphery portion extending laterally from the boundary between the root portion and the projecting portion in the three-dimensional gather in the front-rear direction intermediate range including the front-rear direction center of the diaper,
Each leg-surrounding part is configured as a flat gather by being fixed in a state where the elastic elastic member is stretched in the front-rear direction at a position spaced laterally from the boundary in each leg-surrounding part.
In disposable diapers;
A gather joint is formed by joining the free part of the three-dimensional gather and the planar gather on either one of the front and rear of the crotch part in the front-rear direction range corresponding to the middle in the front-rear direction of the free part. And
The absorber is formed with a narrowed portion for a gather joint that is narrower than the front and rear sides at the front-rear direction position corresponding to the gather joint.
A disposable diaper characterized by that.

(Function and effect)
In this way, when the free part of the three-dimensional gather and the planar gather are joined by the gather joint part, the contraction force of the planar gather acts to raise the three-dimensional gather, and conversely, the contraction force of the three-dimensional gather collects the planar gather. Since the three-dimensional gathers automatically and properly stand up when wearing, and the three-dimensional gathers and the two-dimensional gathers support each other, the fit of both of them improves synergistically and leaks. The prevention performance is excellent. And, when such a gathered joint is provided, the rise of the three-dimensional gather will be suppressed at the gather joint part, but in the present invention, the position of the gathered joint is not the crotch part, but its front and back. Since either one side, that is, the position where the rise of the solid gather is low, the rise of the solid gather is unlikely to cause leakage. Furthermore, in this invention, the length from the side edge of an absorber to the front-end | tip of a three-dimensional gather is for gather joint parts by providing the gather joint part narrow part in the front-back direction position corresponding to the gather joint part in an absorber. The substantial height of the three-dimensional gather is increased in the portion having the gather joint portion that is enlarged by the constricted portion. More specifically, as the three-dimensional gather rises due to the contraction force of the elastic expansion and contraction member, the absorber is bent at the portion connecting the right and left gather joint portions and is located in the gather joint portion. Will also form part of the rising part of solid gathers. As a result, leakage from the gather joint portion in the three-dimensional gather is effectively prevented.

<Invention of Claim 2>
The absorbent body has a leg-bend portion along the leg circumference in a front-rear direction range including the crotch portion, and the gather joint portion and the gather joint-bend portion are formed on the rear side of the leg-bend portion. The disposable diaper according to claim 1.

(Function and effect)
As described above, the rise of the three-dimensional gather is suppressed to some extent at the site of the gather joint, but the rear side of the leg-necked portion that is often provided in the absorber is the portion that contacts the bulge of the buttocks. This is where the rise of gathers is unlikely to be a problem. Therefore, it is desirable to form a gather joint and a gather joint constriction in this portion.

<Invention of Claim 3>
The widthwise length of each of the gather joint portions is 80 to 120% of the widthwise length from the tip of the three-dimensional gather to the side edge of the absorber,
The length of the gather joint constriction in the front-rear direction is longer than the length of the gather joint in the front-rear direction, and is 100 to 140% of the length in the width direction from the tip of the three-dimensional gather to the side edge of the absorber. Is,
The disposable diaper according to claim 1 or 2.

(Function and effect)
The dimensions of the gather joint constriction can be determined as appropriate, but in the normal case, it is preferable that the portion within the gather joint constriction is easily raised by being within the above range.

<Invention of Claim 4>
The disposable diaper of any one of Claims 1-3 whose front-back direction length of the said gather junction part is 1-10 mm.

(Function and effect)
The dimensions of the gather joint can be determined as appropriate, but since it is preferable that the range in which the rise of the three-dimensional gather is suppressed is short, it is preferable that the dimensions be set to such a level in normal cases.

  As described above, according to the present invention, there are advantages such as being able to prevent leakage at the gather joint.

It is a top view of the fully developed state which shows the inner surface of a tape type disposable diaper. It is a top view of the fully developed state which shows the outer surface of a tape type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 1. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 1. FIG. 9 is a sectional view taken along line 9-9 in FIG. 1. It is a perspective view which shows the inner surface of a tape type disposable diaper. FIG. 6 is a cross-sectional view corresponding to a cross section taken along line 6-6 of FIG. It is a principal part enlarged plan view of various absorbers. It is a top view of various absorbers. 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. 6 is a sectional view taken along line 6-6 of FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 7 show an example of a tape-type disposable diaper according to the present invention. 3 and 4 are views showing a cross section taken along line 6-6 and 7-7 in FIG. 1, respectively, and FIGS. 5 and 6 are cross sections taken along line 8-8 and 9-9 in FIG. FIG. 1, 4, and 7, hatched portions (dotted pattern portions) indicate an adhesive such as a hot melt adhesive or a fixed portion by welding.

  This tape-type disposable diaper is a part that extends from the lower abdomen through the crotch part to cover the buttocks along the center in the width direction, and the liquid-permeable top sheet 30 that forms the body side surface, and the outer surface An absorbent main body 10 which is a portion where the absorbent body 56 is interposed between the liquid-impermeable sheet 11 located on the side and a portion extending to the front side and the rear side of the absorbent main body portion 10 respectively. And the part which does not have the absorption element 50, and is the part which each extends to the width direction both sides of the abdominal side end flap part FE and back | dorsal end flap part BE, and the absorptive main body part 10, Comprising: The side flap portions SF and SF, which are portions that are not provided, are provided.

  Moreover, the fastening tape 130 as a locking member is provided in the side flap parts SF and SF in the waist part of the back part B, respectively.

  More specifically, the entire outer surface of the absorbent main body 10 and the respective side flap portions SF, SF on the back side and the abdomen side is formed by the exterior sheet 12. In particular, in the absorbent main body 10, a liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot-melt adhesive, and an absorbent element is further disposed on the inner surface side of the liquid-impermeable sheet 11. 50, the intermediate sheet 40, and the top sheet 30 are laminated in this order. 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 and the width direction than the absorbent element 50, and protrude from the side edge of the absorbent element 50 in the top sheet 30. The peripheral edge part and the peripheral edge part which protrudes from the side edge of the absorption element 50 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like. The liquid-impermeable sheet 11 is made of a moisture-permeable polyethylene film or the like and is formed to be slightly wider than the top sheet 30.

  Further, on both sides of the absorbent main body 10, three-dimensional gathers 60, 60 projecting (standing) to the wearer's skin side are provided, and gather sheets 62, 62 forming the three-dimensional gathers 60, 60 are provided. Moreover, it extends over the whole width direction outer side of the absorptive main-body part 10 including the inner surface of each side flap part SF and SF of a back side and an abdominal side.

  Furthermore, each side flap part SF, SF has a leg periphery part 80 extending to the side of the three-dimensional gather 60 in the front-rear direction intermediate range including the front-rear direction center C of the diaper. 80 is configured as a planar gather. The range in the front-rear direction of the leg-surrounding portion 80 can be determined as appropriate. However, when the side edge of the diaper has a constricted portion that extends around the leg as shown in the illustrated example, the front-rear direction range corresponding to the constricted portion is used. be able to.

Hereinafter, the material and the characteristic part of each part are demonstrated in order.
(Exterior sheet)
The exterior sheet 12 is a part that supports the absorbent element 50 and is attached to the wearer. The exterior sheet 12 has an hourglass shape in which the center part in the front-rear direction on both sides is constricted, and this is a part that surrounds the wearer's leg.

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 .

(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.

(Top sheet)
The top sheet 30 is sufficient if it has liquid permeability, and for example, a porous or non-porous nonwoven fabric or a porous plastic sheet can be used. 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, 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 a single sheet or 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.

(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 quickly transfers the excrement to the absorber to enhance the absorption performance by the absorber, but also prevents the excretion of the absorbed excrement from returning from the absorber and improves the feel of the top sheet 30 surface. To do. The intermediate sheet 40 can be omitted.

  As the intermediate sheet 40, the same material as 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 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. The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The packaging sheet 58 can be omitted. 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.

(Superabsorbent polymer particles)
The absorbent body 56 preferably includes superabsorbent polymer particles. In particular, at least in the liquid receiving region, the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of fibers. Is desirable.

  If there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or if there is very little, it cannot be said that the "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some SAP particles do not enter the fiber assembly and remain on the surface thereof, and a form in which some SAP particles pass through the fiber assembly and are on the packaging sheet 58 are also excluded. It is not something.

  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 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 absorber 56 returns to the outside of the absorber 56, and so-called reversal is likely to occur.

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 , not only the effect is saturated, but also the sensation of incongruity due to the excess of the superabsorbent polymer particles is given.

(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 SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The fiber basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  As shown in FIG. 3, the packaging sheet 58 may wrap only the back surface and the side surface of the layer in addition to the form of wrapping the entire absorbent body 56. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the packaging sheet). If necessary, the absorbent body 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.

(Fastening tape)
As shown in FIGS. 1 and 2, the fastening tape 130 has a base portion of a fastening base material 130 </ b> C made of a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper, or a composite material thereof attached to the diaper, and protrudes from the diaper. A hook material 130 </ b> A of a mechanical fastener is provided as a locking portion for the ventral side at the distal end side portion. The hook material 130A is bonded to the fastening base material 130C by an adhesive so as not to be peeled off.

  In the diaper for infants, among the dimensions of the attachment portion of the fastening tape 130, the length X1 in the width direction of the diaper is preferably 10 to 50 mm, particularly preferably 20 to 40 mm, and the length Y1 in the front-rear direction is 20 to 100 mm. In particular, the thickness is preferably 40 to 80 mm. Of the dimensions of the front end portion of the fastening tape 130, the length in the width direction of the diaper is preferably 30 to 80 mm, particularly preferably 40 to 60 mm, and the length (height) in the front-rear direction is 20 to 70 mm. In particular, the thickness is preferably 25 to 50 mm. In addition, when a part or all of the fastening tape 130 has, for example, a substantially tapered shape and the length in the front-rear direction and the length in the width direction are not constant, the numerical range is determined by an average value. The shape of the fastening tape 130 may be a symmetric shape such as a rectangular shape, but if it is a convex shape consisting of a wide attachment portion and an elongated tip side portion, the knob on the tip side portion is easy to pick and This is preferable because the tension between the bases of this region acts over a wide range. The hook member 130A has a large number of engaging protrusions on the outer surface side. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. Instead of the hook material 130 </ b> A, an adhesive material layer can be provided as a locking portion of the fastening tape 130.

  When wearing the diaper, the fastening tape is applied to a suitable position on the outer surface of the abdominal side F with the side flap portion SF on the waist side of the back portion B overlapped on the outside of the side flap portion SF on the waist side of the abdominal portion F. Stop. The position and size of the fastening portion of the fastening tape 130 can be arbitrarily determined. In diapers for infants, the locking location is a rectangular range of 20 to 80 mm in the front-rear direction and 150 to 300 mm in the width direction, and the distance in the height direction between the upper edge and the ventral upper edge is 0 to 60 mm, particularly 20 to 50 mm. And the center in the width direction of the product.

  When the fastening tape 130 is attached so that the attachment portion of the fastening tape 130 overlaps the boundary line between the back end flap portion BE and the absorbing element 50, the tension acting between the attachment portions of the right and left fastening tapes 130 when the diaper is attached. This is preferable because the back side end of the absorbent element 50 is firmly pressed against the body. Also, if the attachment portion of the fastening tape 130 is too far from the back end portion (rear end portion) of the diaper, the tension acting between the attachment portions of the left and right fastening tapes 130 when the diaper is mounted is the back end portion of the diaper. Therefore, a gap is likely to occur between the back end of the diaper and the body surface. Therefore, the length in the front-rear direction of the back end flap BE is preferably the same as or shorter than the length in the front-rear direction of the base portion of the fastening tape 130.

(Target tape)
It is preferable to provide a target tape 74 having target printing for facilitating the locking at the locking position of the fastening tape 130 on the ventral side F. As the target tape 74, when the hook portion is the hook material 130 </ b> A, a target tape 74 in which a large number of loop yarns on which the hook material's engaging projections are entangled is provided on the surface of a sheet base material made of a plastic film or nonwoven fabric can be used. In the case of an adhesive material layer, a sheet base material 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 130 on the ventral side 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 fastening portion of the fastening tape 130 is a hook material 130A, The target tape 74 can be omitted, and the hook material 130A can be entangled with the nonwoven fabric of the exterior sheet 12 and locked. In this case, the target tape 74 may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.

(End flap)
The end flap part is a part that extends to the front side and the rear side of the absorbent main body part 10 and does not have the absorbent element 50, and the front side extension part is the ventral end flap part FE. The extended portion on the rear side is the back end flap portion BE.

  The length in the front-rear direction of the back end flap BE is preferably the same as or shorter than the length in the front-rear direction of the attachment portion of the fastening tape 130 for the reasons described above. If it is too close, a gap is likely to occur between the back end of the diaper and the body surface due to the thickness and stiffness of the absorbent element 50, so that it is preferably 10 mm or more.

  The length in the front-rear direction of the ventral end flap part FE and the back end flap part BE is preferably about 5 to 20% of the length L in the front-rear direction of the whole diaper. In particular, a thickness of 20 to 50 mm is appropriate.

(Back elastic sheet)
In the illustrated embodiment, a belt-like back-side stretchable sheet 70 that elastically expands and contracts in the width direction is provided between both fastening tapes 130 to improve the fit on the back side of the diaper. Both end portions of the back-side elastic sheet 70 are preferably extended to a portion that overlaps with the attachment portions of the two fastening tapes 130, but may be separated to the center in the width direction. The back-and-forth stretchable sheet 70 has a front-rear dimension that is approximately the same as the front-rear dimension of the fastening tape 130 mounting portion, but is preferably within a range of about ± 20%. Further, when the back elastic sheet 70 is arranged so as to overlap the boundary line between the back end flap BE and the absorbent element 50 as shown, the back end of the absorbent element 50 is firmly pressed against the body. Therefore, it is preferable. The back side elastic sheet 70 may use a sheet-like elastic elastic member such as a rubber sheet, but it is preferable to use a nonwoven fabric or paper from the viewpoint of air permeability. In this case, a sheet-like elastic stretchable member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIG. 5, the sheet base 71 such as two nonwoven fabrics is bonded to an adhesive such as a hot melt adhesive. It is preferable that the elastic elastic member 72 such as a perforated sheet, net, or elongated (thread-like or string-like) is fixed between the two sheet base materials 71 while being stretched along the width direction. Used for. As the sheet base 71 in this case, the same one as the exterior sheet 12 can be used. It is preferable that the elastic expansion / contraction member 72 has an extension ratio of about 150 to 250%. In addition, when an elongated (stretch or string-like) member is used as the elastic elastic member 72, it is preferable to provide about 5 to 15 members having a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.

  In addition, it is preferable that a part of the elastic expansion / contraction member 72 is arranged so as to cross the absorbent element 50 as shown in the figure because the fitting property of the absorption element 50 is improved, but in this case, the elastic expansion / contraction member 72 is used. If the contraction force is prevented from acting on a part or all of the overlapping portion by means such as cutting, the back end of the absorbent element 50 does not contract in the width direction, so that the fit is further improved.

  The elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent the sheet from shrinking or curling when attached to the diaper body, In the range of about 5 to 20 mm at the end in the front-rear direction (diaper width direction), it is preferable that the contraction force does not work or the elastic elastic member 72 does not exist.

  In the illustrated form, the back-side stretchable sheet 70 is sandwiched between the gather sheet 62 and the exterior sheet 12 on both sides in the width direction of the liquid-impermeable sheet 11, and is not liquid-impermeable at portions overlapping the liquid-impermeable sheet 11. Although provided so as to be sandwiched between the permeable sheet 11 and the absorbent element 50, it may be provided between the liquid-impermeable sheet 11 and the exterior sheet 12, or provided on the outer surface of the exterior sheet 12. Alternatively, it may be provided between the top sheet 30 and the absorbent element 50. Further, the back-side elastic sheet 70 may be provided on the top sheet 30. In this case, the back-side elastic sheet 70 may be provided on the gather sheet 62 on both sides in the width direction of the liquid-impermeable sheet 11. Further, when the exterior sheet 12 is formed by stacking a plurality of sheet base materials, the entire back-side stretchable sheet 70 may be provided between the sheet base materials of the exterior sheet 12.

(Three-dimensional gather)
In order to prevent urine and soft stools that move in the lateral direction on the top sheet 30 and prevent side leakage, three-dimensional gathers 60, 60 that stand up (stand up) on the front side are provided on both sides in the width direction of the product. Yes.

  In the unfolded state, the three-dimensional gather 60 includes a gather sheet 62 that covers the entire inner surface of the diaper from the side region of the absorbent body 56 to the outer region in the width direction, and an end portion of the gather sheet 62 on the center side in the width direction. And an elastic elastic member 63 fixed in an extended state along the front-rear direction. A water-repellent nonwoven fabric can be used as the gather sheet 62, and the elastic elastic member 63 is an elongated shape such as a rubber thread or a belt, particularly about 470 to 940 dtex and about 150 to 250% in thickness. It is preferable to provide the stretch rate along the front-rear direction. In this case, a plurality of the three-dimensional gathers 60 can be provided as well as one for each three-dimensional gather 60 as shown in FIGS.

  The inner surface of the gather sheet 62 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is on the side portion of the liquid-impermeable sheet 11 and on the outer side in the width direction. A root portion 65 fixed to the side portion of the positioned exterior sheet 12 by welding of an adhesive or a material is used.

  On the other hand, the protruding portion 66 protruding from the fixed starting end of the three-dimensional gather 60 has an unfixed free position located between a lying portion 67 fixed to the diaper surface with both front and rear ends lying in a lying state and a front and back lying portion 67. The elastic member 63 is provided at the tip of the free portion 68. The lodging portion 67 can be formed by welding an adhesive or a material, and the length in the front-rear direction is preferably about 30 to 100 mm, or about 1/15 to 1/8 of the product length L.

(Plane gathering)
Among the portions extending outward in the width direction from the boundary between the root portion 65 and the protruding portion 66 in the three-dimensional gather 60, the middle range in the front-rear direction including the center C in the front-rear direction of the diaper is around the leg abutted around the leg Part 80 is formed. In the leg periphery portion 80, an elastic elastic member 81 made of thread rubber or the like is provided along the front-rear direction between the sheets of the portion where the gather sheet 62 and the exterior sheet 12 face each other. Due to the contraction of the leg, the leg periphery 80 becomes a flat gather.

  The width 80w of the planar gather 80 can be determined as appropriate, but is preferably about 80 to 120% of the width 66w of the protruding portion 66 of the three-dimensional gather 60.

  As the elastic elastic member 81 of the planar gather 80, an elongated member such as a rubber thread or a belt, particularly a member having a thickness of about 470 to 940 dtex, is provided along the front-rear direction with an extension ratio of about 150 to 250%. In particular, at least one of the thickness and the elongation rate of the elastic elastic member 81 of the planar gather 80 is preferably thicker or higher than that of the three-dimensional gather, but may be thinner or lower.

  The elastic member 81 of the planar gathers 80 may be one, but it is preferable that a plurality of elastic members 81 are arranged in parallel in the width direction, and the interval 81d can be appropriately determined, but is about 3 to 8 mm. Is preferred.

(Gather joint)
Characteristically, the free portion 68 of the three-dimensional gather 60 and the base end side portion of the planar gather 80 are joined to the rear side of the crotch portion in the front-rear direction range corresponding to the middle of the free portion 68 of the three-dimensional gather 60. As a result, a gather joint 90 is formed, and a gather joint constriction 59 having a narrower width than the front and rear sides is formed at a position in the front-rear direction corresponding to the gather joint 90 in the absorber 56. .

  As described above, when the free portion 68 of the three-dimensional gather 60 and the planar gather 80 are joined by the gather joint portion 90, the contraction force of the planar gather 80 causes the three-dimensional gather 60 to stand up as shown in FIGS. Since the shrinkage force of the three-dimensional gather 60 acts to press the flat gather 80 against the surface around the legs, the three-dimensional gather 60 rises automatically and appropriately when worn, and the three-dimensional gather 60 and Since the planar gathers 80 support each other, the fitting properties of the two are synergistically improved and the leakage prevention performance is excellent. When such a gathered joint 90 is provided, the rise of the three-dimensional gather 60 is not limited at the gathered joint 90, but in the present invention, the gathered joint 90 is located at the crotch. However, since either one of the front and rear sides, that is, the position where the rise of the solid gather 60 is low, the rise of the solid gather 60 is unlikely to leak. Further, by providing the gather joint portion constricted portion 59 at the front-rear direction position corresponding to the gather joint portion 90 in the absorber 56, the length from the side edge of the absorber 56 to the tip of the three-dimensional gather 60 is the gather joint portion. The substantial height of the three-dimensional gather 60 is increased in the portion having the gather joint portion 90 enlarged by the constricted portion 59. More specifically, as shown in FIG. 7 and FIG. 8, as the three-dimensional gather 60 rises due to the contraction force of the elastic elastic member 63, the absorbent body 56 is connected at the portion connecting the right and left gather joint portions 59. While bending, the portion located in the gather joint constricted portion 59 also rises and constitutes a part of the rising portion of the three-dimensional gather 60. As a result, leakage from the gather joint portion 90 in the three-dimensional gather 60 is effectively prevented.

  The size of the gather joint portion constricted portion 59 can be determined as appropriate. In normal cases, the width direction length 59x of each gather joint portion constricted portion 59 is from the front end of the three-dimensional gather 60 to the side edge of the absorber 56. It is preferable to be 80 to 120% of the length 60x in the width direction. Furthermore, the front-rear direction length 59y of the gather joint portion constricted portion 59 is preferably longer than the front-rear direction length 90y of the gather joint portion 90. In addition, the length 59y in the front-rear direction of the gather joint portion constricted portion 59 is preferably 100 to 140% of the length 59x in the width direction from the tip of the three-dimensional gather 60 to the side edge of the absorber 56. By satisfying at least one of these conditions, the portion located in the gather joint constricted portion 59 can easily rise.

  The shape of the gather joint portion constricted portion 59 can be determined as appropriate. In addition to the triangular shape as shown in FIG. 9A, the shape can also be an arc shape as shown in FIG. If it is trapezoidal as shown to 9 (c), the fitting property of the absorber 56 will become favorable.

  The joint portion of the free portion 68 of the three-dimensional gather 60 with the planar gather 80 can be determined as appropriate, and can be the tip portion of the free portion 68. It is preferable to do. The dimensions of the gather joint 90 can be determined as appropriate, but the width 90x is preferably about 5 to 90% of the width 66w of the protruding portion 66 of the three-dimensional gather 60. Moreover, although the length 90y of the front-back direction of the gather junction part 90 can be determined suitably, since it is preferable that the range where the rising of the three-dimensional gather 60 is suppressed is short, it is preferable to be about 1 to 10 mm. The gather joint portion 90 can be formed by welding an adhesive or a material.

  On the other hand, it is preferable that the elastic elastic member 81 of the planar gather 80 is laterally separated from the gather joint portion 90. The separation distance 81f can be determined as appropriate, but is preferably about 70 to 130% of the width 66w of the protruding portion 66 of the three-dimensional gather 60.

  The front-rear direction position at which the gather joint 90 and the gather joint constriction 59 are formed may be on either one of the front and rear of the crotch part in the front-rear direction range corresponding to the middle of the free part 68 of the three-dimensional gather 60. However, in particular, in the form in which the absorbent body 56 has the leg-bend portion 57 along the circumference of the leg in the front-rear direction range including the crotch portion as shown in the figure, the rear side of the leg-bend portion 57 should be provided. Is preferred. As described above, the rise of the three-dimensional gather 60 is suppressed to some extent at the gather joint portion 90, but the rear side of the leg periphery constricted portion 57 often provided in the absorber 56 is in contact with the swelling of the buttocks. This is because the rising height of the three-dimensional gather 60 is unlikely to be a problem.

  As long as it has the said narrow part, the shape of the absorber 56 is not specifically limited, As shown to Fig.10 (a), it is set as the shape which has the leg periphery constriction part 57 and the gathering part constriction part 59 in the back side. In addition, as shown in FIG. 10B, the gather joint portion constricted portion 59 may be formed on the basis of a rectangular shape without the leg constricted portion 57. As shown in FIG. 10 (c), the width of the portion having the gather joint constricted portion 59 is made larger than the width of the portion on the front side, thereby forming the gather joint constricted portion 59. A decrease in the amount of absorption may be compensated. On the contrary, as shown in FIG. 10 (d), the width of the portion having the gathered portion constricted portion 59 is made narrower than the width of the front side portion to increase the rise of the three-dimensional gather 60. You can also.

  The present invention can be applied to a pants type, a pad type, etc. in addition to the tape type as described above, as long as it has a three-dimensional gather.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 57 ... Wrap around leg, 58 ... Packaging sheet, 59 ... Gather joint Bundled part, 60 ... Solid gather, 62 ... Gather sheet, 67 ... Lodging part, 68 ... Free part, 70 ... Back side elastic sheet, 80 ... Planar gather, 90 ... Gather joint part.

Claims (4)

Having a ventral part and a dorsal part extending from the front-rear direction center to the front side and the rear side, respectively;
Having an absorbent body extending from the ventral part to the dorsal part,
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 of the diaper,
The three-dimensional gather includes a root portion fixed to the inner surface of the diaper, a protruding portion protruding from the root portion, a lying portion where both front and rear ends of the protruding portion are fixed in a lying state, and the protruding portion Among them, it has a non-fixed free part located between the front and rear lodging parts, and an elastic elastic member fixed at least at the tip part of the free part in a stretched state in the front-rear direction,
It has side flaps that extend on both sides in the width direction of the absorber,
Each side flap portion has a leg periphery portion extending laterally from the boundary between the root portion and the projecting portion in the three-dimensional gather in the front-rear direction intermediate range including the front-rear direction center of the diaper,
Each leg-surrounding part is configured as a flat gather by fixing the elastic elastic member in a state of being stretched in the front-rear direction at a position spaced laterally from the boundary in each leg-surrounding part.
In disposable diapers;
A gather joint is formed by joining the free part of the three-dimensional gather and the planar gather on either one of the front and rear of the crotch part in the front-rear direction range corresponding to the middle in the front-rear direction of the free part. And
The absorber is formed with a narrowed portion for a gather joint that is narrower than the front and rear sides at the front-rear direction position corresponding to the gather joint.
A disposable diaper characterized by that.   The absorbent body has a leg-bend portion along the leg circumference in a front-rear direction range including the crotch portion, and the gather joint portion and the gather joint-bend portion are formed on the rear side of the leg-bend portion. The disposable diaper according to claim 1. The widthwise length of each of the gather joint portions is 80 to 120% of the widthwise length from the tip of the three-dimensional gather to the side edge of the absorber,
The length of the gather joint constriction in the front-rear direction is longer than the length of the gather joint in the front-rear direction, and is 100 to 140% of the length in the width direction from the tip of the three-dimensional gather to the side edge of the absorber. Is,
The disposable diaper according to claim 1 or 2.   The disposable diaper of any one of Claims 1-3 whose front-back direction length of the said gather junction part is 1-10 mm.

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