JP2009005999A - Fastening type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening type disposable diaper which more effectively prevents a leakage to the back. <P>SOLUTION: In providing a back side barrier belt 20 which extends along the width direction over almost the same width direction range as a top sheet 30 on an innermost side in a back side end flap part BE, a width direction both end part 22e in the extension part 22 of the back side barrier belt 20 is fixed to the back side end flap part BE so that it is not separated, in a two-folded state having a base end side part 23 extending to the center part side in the transverse direction from an edge on the side of a root part 21 and a tip side part 24 which is folded back on the body side from the edge of the center side in the transverse direction of the base end side part 23 and extends close to the upper edge of the back side end flap part BE, while a width direction middle part 22c is a non-fixed free part so that it can be separated from the back side end flap part BE, and an elastic expansion/contraction member 25 is fixed to the tip part in the free part 22c in a state expanded along the width direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stationary disposable diaper.

Fastening-type disposable diapers are widely used especially for infants and nursing care. Most of the stationary disposable diaper is a part that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks, and forms a body-side surface; An absorbent main body part, which is a part where the absorbent element is interposed between the liquid-impermeable sheet positioned on the outer surface side, a part extending to the front side and the rear side of the absorbent main body part, and the absorbent element With ventral and dorsal end flaps that are parts that do not have and fastening pieces respectively provided on both sides of the dorsal side, and by attaching these fastening pieces to the ventral outer surface It is.
Such stationary disposable diapers are more likely to have a gap between the body and the back side of the diaper than so-called pants, and excrement such as urine, watery stool, and loose stool leaks through the gap. There has been a problem that a situation (so-called back leakage) is likely to occur. Therefore, conventionally, it has been proposed to improve the stretchability in the product width direction on the back side in particular, and to provide a back side barrier band along the width direction on the back side inner surface (see, for example, Patent Documents 1 to 4). .
JP 2001-245922 A Japanese Patent Laid-Open No. 9-215709 Japanese Patent No. 3602134 Japanese Patent No. 3605426

However, most of the conventional dorsal barrier belts are arranged so as to cross the upper part of the crack (the groove between the two ribs) and do not fit securely into the crack. Back leakage sometimes occurred.
On the other hand, in the device described in Patent Document 4, the back barrier band is disposed not on the buttocks but on the waist, but the root of the standing barrier and the tip of the free portion are separated from each other. Even if the longitudinal dimension is large, the standing angle is shallow, so that a sufficient standing height cannot be obtained in the vertical direction. For this reason, in the structure described in FIG. 1 and FIG. 2 of Patent Document 4, it is difficult to fit the waist curve and a gap is likely to occur. Further, in the structure shown in FIG. 3 of Patent Document 4, when the height of the back barrier band is to be secured, the tip of the back barrier band becomes close to the buttocks and close to the absorber. In this case, the unevenness of the body surface with which the tip of the back barrier band comes into contact increases, and the distance between the body and the base of the back barrier band increases by the thickness of the absorber, so the tip of the back barrier band is the body. It becomes difficult to fit the surface. On the contrary, if the height of the back barrier band is lowered, the tip of the back barrier band moves away from the buttocks and the absorber, but there is a limit because the followability to the body surface becomes poor.
Therefore, the main problem of the present invention is to prevent back leakage more effectively.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A liquid-permeable top sheet that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks and that forms the body-side surface, and a liquid impervious located on the outer surface side An absorptive main body which is a portion where an absorber is interposed between the sheet,
A back end flap portion which is a portion extending to the rear side of the absorbent main body portion and which does not have the absorber;
In a stationary disposable diaper configured to be worn by locking the dorsal side and the abdominal side using fastening pieces attached to both sides of the dorsal side,
On the innermost side in the back side end flap part, a belt-like back side barrier band extending along the width direction is provided so that at least the absorbent body and the width direction range overlap,
A portion on one side in the width direction of the back barrier band is a root portion fixed to the vicinity of the upper edge of the back end flap portion, and a portion on the other side in the width direction extends from the root portion. It is considered as an extension part
Of the both ends in the width direction of the extended portion and the intermediate portion in the width direction, the both ends in the width direction are a base end side portion and a base end side portion extending from the edge on the base portion side to the center in the front-rear direction. So as not to be separated from the dorsal end flap portion in a double-folded state having a front end side portion that is folded back from the edge on the center side in the front-rear direction to the body side and extends to the vicinity of the upper edge of the dorsal end flap portion. The fixed width portion is a non-fixed free portion that can be separated from the back end flap portion, and an elastic stretchable member extends along the width direction at least at the tip of the free portion. Fixed in a state,
A disposable disposable diaper characterized by that.

(Function and effect)
In the present invention, (a) the back barrier band is provided on the innermost side of the back end flap part, and (b) both ends in the width direction of the extended part of the back barrier band are the edges on the root part side. A proximal end portion extending from the front and rear direction center side to a proximal end portion extending from the front and rear center edge of the proximal end portion to the body side and extending to the vicinity of the upper edge of the back end flap portion; It is characterized in that it is combined with a point that is fixed so as not to be separated from the back end flap portion in a double-folded state. In such a configuration, the leading edge of the free portion of the back side barrier band is located in the vicinity of the upper edge of the back side end flap portion, and extends in a string shape with respect to the curved shape of the back side upper edge in plan view. And fits well to a relatively flat waist surface. In other words, the crescent-shaped gap between the body waist and the inner side of the diaper is filled with the back-shaped barrier band having the same shape. Further, by adopting the above-described two-fold fixing structure, the leading edge of the free portion of the back side barrier band is located near the upper edge of the back side end flap part, A sufficient height can be secured.

<Invention of Claim 2>
The joint according to claim 1, wherein the joint portion for welding the root portion of the back barrier band and the member on the back side thereof is provided in a continuous line shape over the entire width direction of the root portion of the back barrier band. Wearable disposable diapers.

(Function and effect)
By providing a continuous linear joint in the entire width direction in this way, the liquid from the gap between the back-side barrier band and the back-side member and the liquid that permeates into the back-side member are oozed out. Can be effectively prevented.

<Invention of Claim 3>
Side barrier cuffs that stand on the use surface side are provided on both sides of the diaper along the front-rear direction.
Each side barrier cuff is a fixed portion in which the outer portion in the width direction is fixed to the side portion of the diaper, and both of the inner portions in the width direction are fixed portions that are fixed to the diaper in the front-rear direction. The front-rear direction range between the fixed parts is a free part,
Elastic fixing members around the legs are respectively provided along the front-rear direction on the fixing portion on the outer side in the width direction of each side barrier cuff,
The length in the front-rear direction of the dorsal end flap portion is the same as or shorter than the length in the front-rear direction of the fastening piece mounting portion,
The length in the front-rear direction in the deployed state of the free portion of the back-side barrier band is the same as or shorter than the length in the front-rear direction of the back-side end flap portion,
The width direction length of the free part of the back barrier band is longer than the distance in the width direction of the tip of the free part of the left and right side barrier cuffs in the deployed state of the diaper, and the width of the elastic elastic members around the left and right legs Shorter than the direction separation distance,
The elastic elastic member of the back side barrier band is fixed so as to extend over the entire width direction of the free part of the back side barrier band and stretched by 150 to 190%.
The fixed disposable diaper according to claim 1 or 2.

(Function and effect)
By such a combination of dimensions, the back barrier band surely fits to the waist of the body and has excellent followability to body movement.

  As described above, according to the present invention, since the root portion of the back side barrier band is fixed to the vicinity of the upper edge of the back side end flap portion, the absorbability of the absorbent body and the top sheet is fully utilized and absorbed. Back leakage can be prevented more effectively, for example, urine can be blocked after the body has sufficiently absorbed.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 show an example of a stationary disposable diaper according to the present invention. FIG. 2 is a view taken along line B-B in FIG. This fixed disposable diaper is a part that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks, and a liquid-permeable top sheet that forms the body side surface, and an outer surface An absorbent main body 10 which is a portion where an absorber is interposed between a liquid-impermeable sheet positioned on the side, and a portion extending to the front side and the rear side of the absorbent main body portion 10 respectively, and It has a ventral end flap part FE and a dorsal end flap part BE, which are parts that do not have the absorber 56.
The fixed disposable diaper includes a pair of abdominal side flap portions FF, FF extending to the outside in the width direction from the crotch portion C on both sides of the upper edge F1 side portion of the abdominal side F, and the back side. On both sides of the upper edge B1 side portion of B, a pair of back side flap portions BF, BF extending to the outside in the width direction from the crotch portion C are provided. Moreover, the fastening piece 130 as a locking member is provided in the back side flap part BF and BF, respectively.
More specifically, the entire outer surface of the absorbent main body 10 and the side flap portions BF and FF 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 are eaten from the side edges of the absorbent element 50 in the top sheet 30. The peripheral edge that protrudes 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. 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, side barrier cuffs 60, 60 projecting (standing) on the skin side of the wearer are provided on both sides of the absorbent main body 10, and a barrier sheet forming the side barrier cuffs 60, 60 is provided. 64 and 64 are extended over the whole width direction outer side of the absorptive main-body part 10 including the inner surface of each side flap part BF and FF of back side and abdominal side.

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 into which the wearer's leg is placed.
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 .

(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 improves the absorption performance by the absorber by quickly transferring the excrement to the absorber, but also prevents the excretion of the absorbed excrement from returning from the absorber, making the top sheet 30 surface feel better 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.

(Side barrier cuffs)
In order to prevent urine and soft stool that move laterally on the top sheet 30 and prevent lateral leakage, side barrier cuffs 60, 60 that protrude (stand up) on the use surface side are provided on both sides of the product. Is preferred.
The side barrier cuff 60 is constituted by a barrier sheet 64 that is substantially continuous in the width direction, and an elongated elastic elastic member 62 that is fixed to the barrier sheet 64 in a stretched state along the front-rear direction. As the barrier sheet 64, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 62, thread rubber or the like can be used. As shown in FIGS. 1 and 2, a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.
The inner surface of the barrier sheet 64 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. It fixes to the side part of the exterior sheet | seat 12 located with the hot-melt-adhesive agent etc. Out of the fixing portions, on the outer side in the width direction in the vicinity of the fixing start end, leg elastic elastic members 66 made of thread rubber or the like are provided along the front-rear direction between the sheets where the barrier sheet 64 and the exterior sheet 12 face each other. It has been.
Around the leg, the width direction inner side of the side barrier cuff 60 is fixed on the top sheet 30 at both ends in the longitudinal direction of the product, but the portion between them is an unfixed free part. The portion comes to stand by the contraction force of the rubber thread 62. When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts, so that the side barrier cuffs 60 stand up and adhere to the legs around the contraction force of the rubber thread 62. . As a result, so-called side leakage from around the legs is prevented.
Unlike the illustrated embodiment, both front and rear direction end portions of the barrier sheet 64 on the inner side in the width direction are connected to a base end side portion extending from the width outer side portion to the width direction inner side and the base end side portion in the width direction central side. It is also possible to fix in a double-folded state having a distal end side portion that is folded back from the edge toward the body side and extends outward in the width direction, and the portion in between can be an unfixed free portion.

(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 covering sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The covering sheet 58 can be omitted. Further, in the illustrated embodiment, the holding sheet 80 is provided between the absorber 56 and the back surface side portion (lower part) of the covering sheet 58, but the holding sheet 80 may 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 by an aggregate of the fibers 52 and 52. 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)
As shown in FIG. 2, the absorbent body 56 preferably includes superabsorbent polymer particles 54, 54..., In particular, at least in the liquid receiving region, the superabsorbent polymer particles with respect to the aggregate of fibers 52, 52. It is desirable that (SAP particles) be dispersed substantially throughout the thickness direction.
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. In addition, a form in which some SAP particles do not penetrate into the aggregates of the fibers 52, 52... Remain on the surface, and some SAP particles pass through the aggregates of the fibers 52, 52. The form on the sheet 58 and the form on the holding sheet 80 are not excluded.
The superabsorbent polymer particles 54 include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles 54, those used for 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 54 can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of the superabsorbent polymer particles 54 include starch-based, cellulose-based and synthetic polymer-based polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose. A cross-linked product or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles 54 is preferably a granular material that is usually used, but other shapes can also be used.
As the superabsorbent polymer particles 54, those having a water absorption speed of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
The basis weight of the superabsorbent polymer particles 54 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. If it exceeds 350 g / m ² , not only will the effect be saturated, but an excessively high superabsorbent polymer particle 54 will give a sense of incongruity.

(Enveloping sheet)
When the covering sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The fiber basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
As shown in FIG. 2, the covering sheet 58 wraps only the back and side surfaces of the continuous fiber 52, 52... And the superabsorbent polymer particles 54, 54. It may be covered. 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 becomes a component of the covering sheet). If necessary, the aggregate of continuous fibers 52, 52... And the layer of superabsorbent polymer particles 54, 54... May be sandwiched between two upper and lower sheets or disposed only on the lower surface. This is not a desirable form because it is difficult to prevent the movement of particles.

(Holding sheet)
When a filament aggregate is used for the fiber 52, it is preferable to provide a holding sheet 80. In the case where the holding sheet 80 is provided, the superabsorbent polymer particles 54 can be interposed between the holding sheet 80 and the absorbent body 56 by spraying or the like. The superabsorbent polymer particles 54 may pass through the filament aggregate at the time of supply to the filament aggregate or in the subsequent process or until the consumer uses it. The unevenness of the superabsorbent polymer particles that have passed through the filament aggregate gives a crisp and uncomfortable feeling when touched by a hand when used by a consumer.
The holding sheet 80 reinforces the stiffness that is not sufficient only by the covering sheet 58 such as tissue paper (crepe paper), and also reduces or prevents a sense of incongruity when touched by the hand when the consumer uses it. Fulfill.
The material of the holding sheet 80 is not particularly limited as long as it has a holding performance of the superabsorbent polymer 54. Specifically, for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.). ), Polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like.
The holding sheet 80 preferably has a thickness larger than the particle diameter of the superabsorbent polymer particles. The basis weight of the holding sheet 80 is 10 to 60 g / m ^2, it is preferred in particular 20 to 40 g / m ^2.
In particular, the holding sheet 80, the compression energy 0.01~10.00gfcm / cm ² based on KES test, preferably at 0.01~1.00gfcm / cm ^2, and the compression resilience from 10 to 100%, preferably Is preferably 70 to 100% non-woven fabric.
Further, since the superabsorbent polymer 54 that has slipped out is held by the holding sheet 60 and does not move on the covering sheet 58, uneven distribution of the absorption capacity is less likely to occur. In particular, in order to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80, an adhesive hot melt adhesive or the like can be applied on the holding sheet 80 in advance. Alternatively, the upper surface of the holding sheet 80 (surface toward the use surface side) may be a rough surface to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80. Examples of the roughening or fluffing means for this purpose include a non-net surface that is not a net surface during the production of the nonwoven fabric, a marble process, a needle punch process, and a brushing process.
As shown in FIG. 2, the holding sheet 80 may be provided only below the absorber 56, or may be wound up and extended to the upper surface of the absorber 56 through the side surface of the absorber 56, although not shown. It is also possible to use a plurality of holding sheets 80 in a stacked manner.
The above example is an example in which the holding sheet 58 is provided between the absorber 56 and the back side portion of the covering sheet 58, but the holding sheet may be on the back side from the covering sheet 58 (its form is In short, if a holding sheet is provided on the back surface side with respect to the absorber 56, the point is that the sensation of discomfort when touched from the back surface of the product is reduced or not caused.

(Fastening piece)
The fastening piece 130 has a base portion of a fastening base material 130C made of a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper, or a composite material thereof attached to the diaper, and serves as a locking portion for the abdomen on the tip side portion protruding from the diaper. A hook element 130A of a mechanical fastener is provided. The hook element 130A is bonded to the fastening substrate 130C by an adhesive so as not to be peeled off.
In the diaper for infants up to about 12 months in which a watery stool and soft stool are frequently excreted, which is particularly preferable to apply the present invention, the length in the width direction of the diaper among the dimensions of the attachment portion of the fastening piece 130 The length X1 is preferably 10 to 50 mm, particularly preferably 20 to 40 mm, and the longitudinal length Y1 is preferably 20 to 100 mm, particularly preferably 40 to 80 mm. Of the dimensions of the front end portion of the fastening piece 130, the length X2 in the width direction of the diaper is preferably 30 to 80 mm, particularly 40 to 60 mm, and the length Y2 in the front-rear direction is 20 to 70 mm, particularly 25. It is preferably ˜50 mm. In addition, when a part or all of the fastening piece 130 has, for example, a substantially tapered shape, and the lengths Y1 and Y2 in the front-rear direction and the lengths X1 and X2 in the width direction are not constant, the numerical range is determined by an average value. The shape of the fastening piece 130 may be a left-right symmetric shape such as a rectangular shape. However, if the fastening piece 130 is a convex shape composed of a wide attachment portion and an elongated tip-side portion, the knob on the tip-side portion can be easily picked and This is preferable because the tension between the bases of this region acts over a wide range. The hook element 130A has a large number of engaging protrusions on the outer surface side thereof. 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 element 130 </ b> A, an adhesive layer can be provided as a locking portion of the fastening piece 130.
When the diaper is worn, the fastening piece is locked at a proper position on the outer surface of the abdominal side F with the back side flap portion BF overlapped on the outside of the abdominal side flap portion FF. The position and size of the fastening portion of the fastening piece 130 can be arbitrarily determined. In diapers for infants up to about 12 months from the newborn, 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 separation distance in the height direction between the upper edge and the ventral upper edge F1 It is preferably 0 to 60 mm, particularly 20 to 50 mm, and the center in the width direction of the product.
It is preferable to provide a target tape 74 at the locking position of the fastening piece 130 on the ventral side F in order to facilitate locking. As the target tape 74, when the hook portion is the hook element 130A, a tape having a large number of loop yarns on which the engaging projections of the hook element are entangled can be used. A film having a smooth surface that is rich in properties can be used.
Further, when the fastening portion of the fastening piece 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 piece 130 is the hook element 130A, The target tape 74 can be omitted, and the hook element 130A can be entangled with the nonwoven fabric of the exterior sheet 12 and locked.
When the fastening piece 130 is attached so that the attachment portion of the fastening piece 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 pieces 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. Moreover, if the attachment part of the fastening piece 130 is too far from the back side end part (rear end part) of the diaper, the tension acting between the attachment parts of the left and right fastening pieces 130 when the diaper is mounted is the back side end part 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 piece 130.

(End flap)
The end flap part is a part that extends to the front side and the rear side of the absorbent main body 10 and does not have the absorbent element 50, and the front 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 piece 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 front-rear direction lengths of the ventral end flap part FE and the back end flap part BE are preferably about 5 to 20% of the front-rear direction length L of the entire diaper, and it is particularly preferable to apply the present invention. In a diaper for infants up to about 12 months, which frequently excretes watery stool and soft stool, it is appropriate that the diameter is 10 to 60 mm, particularly 20 to 50 mm.

(Back elastic sheet)
In the illustrated embodiment, a belt-like back-side elastic sheet 70 that elastically expands and contracts in the width direction is provided between both fastening pieces 130 to improve the fit in the diaper back side. Both end portions of the back-side elastic sheet 70 are preferably extended to a portion that overlaps with the attachment portions of both fastening pieces 130, but may be spaced apart in 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 attachment portion of the fastening piece 130, but there may be a dimensional difference of about ± 20%. The back-side elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but from the viewpoint of air permeability, as shown in FIG. 3, two nonwoven fabrics 71 are bonded with an adhesive such as a hot melt adhesive. A material in which an elastic stretch member 72 such as a perforated sheet, net, or elongated shape (thread shape or string shape) is fixed in a stretched state in the width direction is preferably used. . As the nonwoven fabric 71 in this case, the same thing 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 to arrange the elastic elastic member 71 so that a part of the elastic elastic member 71 overlaps with the absorbent element 50 as shown in the figure because the fit of the absorbent element 50 is improved. In this case, the elastic elastic member 71 is connected to the absorbent element 50. If the contraction force is prevented from acting on a part or all of the overlapping portions by means such as cutting, the back end portion of the absorbent element 50 does not contract in the width direction, so that the fit is further improved.
In the illustrated embodiment, the back-side stretchable sheet 70 is sandwiched between the barrier sheet 64 and the exterior sheet 12 on both sides in the width direction of the liquid-impermeable sheet 11, and is liquid-impermeable at a portion overlapping the liquid-impermeable sheet 11. It is provided so as to be sandwiched between the permeable sheet 11 and the absorbent element 50, but at a portion overlapping the liquid impermeable sheet 11, it is between the top sheet 30 and the absorbent element 50 or the liquid impermeable sheet 11. And the outer sheet 12 may be provided. Further, when the exterior sheet 12 is formed by stacking a plurality of nonwoven fabrics, the entire back-side stretchable sheet 70 may be provided between the nonwoven fabrics of the exterior sheet 12.

(Back barrier zone)
Characteristically, on the innermost side of the back end flap BE, a belt-like back barrier band 20 extending along the width direction over substantially the same width direction range as the top sheet 30 is provided. A portion of the back side barrier band 20 on one side in the band width direction is a root portion 21 fixed to the back end flap portion BE, and a portion on the other side in the band width direction extends from the root portion 21. Part 22 is designated. For fixing the root portion 21, a hot melt adhesive, heat seal, ultrasonic seal, or the like can be used. In particular, as shown in FIG. 1, the root portion 21 and its back side member (in the case of the illustrated example, the side If the joint HS for welding or adhering both the front and rear ends of the part barrier cuff 60 and the top sheet 30) is provided in a continuous line shape over the entire width direction of the root part 21, the back barrier band 20 This is preferable because it can effectively prevent liquid from seeping out from the gap with the member on the back side. Further, bonding by welding such as heat sealing or ultrasonic sealing, which can surely prevent the liquid component penetrating into the top sheet 30 from oozing out, is more preferable.

  Among the width direction both end portions 22e of the extending portion 22 of the back barrier band 20 and the width direction intermediate portion 22c therebetween, the width direction both end portions 22e are front and rear from the edge on the root portion 21 side as shown in FIG. A proximal end portion 23 extending toward the center in the direction and a distal end portion extending back from the end of the proximal end portion 23 toward the body side to the vicinity of the upper edge of the back end flap BE 24 is fixed so as not to be separated from the back end flap portion BE. In addition to using the hot melt adhesive HM as shown in the figure, a heat seal, an ultrasonic seal or the like can also be used for this fixed portion.

  On the other hand, as shown in FIG. 4, the intermediate portion 22c in the width direction of the extending portion 22 of the back barrier band 20 is an unfixed free portion so as to be separated from the back end flap portion BE. The elastic expansion / contraction member 25 is fixed to at least the distal end portion of the free portion 22c in a state of extending along the width direction so as to cover the entire width direction of the free portion. More specifically, the back barrier band 20 has a double structure in which the sheet is folded in two (or two sheets may be stacked) and bonded together with an adhesive such as a hot melt adhesive. The elastic elastic member 25 is fixed in a state where it is stretched along the width direction at a predetermined portion therebetween. The stretch rate of the elastic elastic member 25 is preferably about 150 to 190%.

As the sheet for forming the back-side barrier band 20, a water-repellent nonwoven fabric can be suitably used as with the side-barrier cuff 60 described above. The water-repellent nonwoven fabric can be produced by a known method such as subjecting a normal nonwoven fabric to a water-repellent treatment such as silicon. As raw materials for nonwoven fabrics, 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 two or more of these were used. Can be used with no particular limitation, such as mixed fiber, composite fiber, etc. The processing method is also used without any limitation, such as spunlace method, spunbond method, thermal bond method, melt blown method, needle punch method, air through method, point bond method, etc. be able to. Among these, particularly preferred nonwoven fabrics are laminated nonwoven fabrics such as SMS nonwoven fabrics and SMMS nonwoven fabrics. The fineness, fiber basis weight, and water pressure resistance of the nonwoven fabric fiber can be determined as appropriate. In general, the fineness of the spunbond layer is 1.1 to 3.3 dtex and the basis weight of the meltblown layer is 1 to 5 g / m ² . The fiber basis weight is 10 to 30 g / m ² , and the water pressure resistance is 100 mmAq or more, preferably 150 mmAq or more. Further, a liquid-impermeable sheet made of a moisture-permeable polyethylene film or the like may be interposed between the double structures.

  As the elastic elastic member 25, an appropriate shape such as a perforated sheet shape, a net shape, an elongated shape (thread shape, string shape, etc.) can be used. In the case of using a long and narrow elastic member (thread-like or string-like) as the elastic elastic member 25, the elastic member 25 is provided at a position in the front-rear direction corresponding to the distal end portion and the proximal end portion of the distal end side portion 24 of the fixed portion 22e in the free portion 22c. In this case, the thickness of the elastic elastic member 25 is preferably about 420 to 1120 dtex.

  The boundary between the extended portion 22 and the root portion 21 of the back-side barrier band 20 is preferably located near the upper edge of the back-side end flap BE. More specifically, this boundary is within the region on the back end side when the back end flap BE is divided into two equal parts in the front-rear direction, particularly when the back end flap BE is divided into three equal parts in the front-rear direction. It is preferable to be located in the region on the most back end side. Thus, by arranging the back side barrier band 20 to stand on the top sheet in the vicinity of the back side end of the diaper, an excellent fit of the back side barrier band 20 can be obtained as described later, and the top The range in which excrement can be diffused on the sheet 30 can be widened. Therefore, the excrement that is about to leak out from the diaper back end is absorbed in the diaper while the top sheet 30 is diffused and becomes a small amount, and this is dammed by the back barrier band 20 having excellent fit. Since it can stop, the back leak of excrement can be prevented effectively.

  When the back-side elastic sheet 70 is provided, the boundary between the extended portion 22 and the root portion 21 of the back-side barrier band 20 is located on the back-side elastic sheet 70, preferably in the vicinity of the upper edge of the back-side elastic sheet 70. It is preferable to do this. More specifically, for example, when the elastic elastic member 72 is constituted by a plurality of elongated members, the boundary is the one on the most dorsal end side (rear end side) or the most dorsal end side. It is preferable to be located on the back end side (rear end side) from the second to the crotch side rather than the second one. By arrange | positioning in this way, the back side elastic sheet 70 functions so that the extension part 22 of the back side barrier band 20 may be pressed on the body surface. It should be noted that the expansion rate of the elastic elastic member 25 fixed to the back-side barrier band 20 and the expansion rate of the elastic elastic member 72 disposed on the back-side elastic sheet 70 at least in the vicinity of the boundary should be approximately the same. It is.

  The dimensions of each part of the back side barrier band 20 can be appropriately determined. However, the back side barrier band in the present application preferably has a lower standing height than the conventional back side barrier band, as will be described later, and thus the free portion 22c. The length 22L in the front-rear direction in the unfolded state (determines the maximum standing height of the back barrier band 20 and is equal to the length in the band width direction in the unfolded state of the extension 22). It is preferable that the length is the same as or shorter than the length Y1 of the portion in the front-rear direction, more preferably the length is the same as or shorter than the length in the front-rear direction of the back end flap BE. Most preferably it is the same or shorter than 1/2. In addition, when the length 22L in the front-rear direction in the deployed state of the free part 22c is less than 5 mm, the effect of blocking watery stool or soft stool cannot be sufficiently obtained. In the case of diapers for infants from a newborn to about 12 months, the length 22L in the front-rear direction in the deployed state of the free portion 22c is preferably 5 to 50 mm, and more preferably 10 to 30 mm.

  Further, the longitudinal lengths 23L and 24L of the base end portion 23 and the distal end portion 24 are preferably equal (folded in half) in the illustrated embodiment, but may be different. By determining the dimensions of each part according to these, the back barrier band 20 is surely fitted to the body waist and has excellent followability to the movement of the body.

  In the thus configured back barrier band 20, as shown in FIG. 5, the leading edge of the free portion 22c is positioned near the upper edge of the back end flap BE, and the back upper edge WE in plan view. It extends in a chordal shape with respect to the curved shape, and fits suitably on a relatively flat waist surface. In other words, the crescent-shaped gap between the body waist and the inner surface of the diaper back side is filled with the back-side barrier band 20 having the same shape.

  As can be seen from these functions, the length 22W in the width direction of the free portion 22c of the back barrier band 20 is the distance X3 in the width direction between the tips of the free portions of the left and right side barrier cuffs 60 when the diaper is deployed. It is preferably longer, and more preferably longer than the length X4 in the width direction of the back end portion of the absorber 56. Further, it is preferably shorter than the widthwise separation distance X5 of the left and right leg elastic elastic members 66, and more preferably shorter than the widthwise separation distance X6 of the fixation start end of the left and right side barrier cuffs 60. With this setting, the crescent-shaped gap can be filled exactly.

  In addition, since the back barrier band 20 has the above-described bi-fold fixing structure, the back side barrier band 20 is formed while the tip edge of the free portion 22c is located in the vicinity of the upper edge of the back end flap BE. The standing height is sufficient. That is, the dorsal barrier band 20 of the present invention stands up near the dorsal end of the diaper at a near vertical angle rather than a shallow standing angle as in the prior art, so that the crescent-shaped narrow gap is exactly the same. It is possible to fit to fill well. In order to make the upright angle standing more reliable, the longitudinal length 22L of the free portion 22c in the unfolded state is sufficiently larger than the length 22W in the width direction of the free portion 22c of the back barrier band 20. It is preferable that the length is short (the standing height is low). Specifically, the length 22L in the front-rear direction in the deployed state of the free portion 22c is preferably 1/5 or less of the length 22W in the width direction of the free portion 22c of the back-side barrier band 20, and 1/10 More preferably, it is more preferably set to 1/13 or less.

  The present invention is applied to a stationary disposable diaper.

It is an expanded state top view of a fixed type disposable diaper. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. It is a top view which shows typically the wearing state of a fixation type disposable diaper.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Absorbent main-body part, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 20 ... Back side barrier band, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 52 ... Fiber, 54 ... High absorption Functional polymer particles, 56 ... absorber, 58 ... wrap sheet, 60 ... side barrier cuff, 64 ... barrier sheet, 70 ... back elastic sheet, 80 ... holding sheet.

Claims (3)

A liquid-permeable top sheet that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks and that forms the body-side surface, and a liquid impervious located on the outer surface side An absorptive main body which is a portion where an absorber is interposed between the sheet,
A back end flap portion which is a portion extending to the rear side of the absorbent main body portion and which does not have the absorber;
In a stationary disposable diaper configured to be worn by locking the dorsal side and the abdominal side using fastening pieces attached to both sides of the dorsal side,
On the innermost side in the back side end flap part, a belt-like back side barrier band extending along the width direction is provided so that at least the absorbent body and the width direction range overlap,
A portion on one side in the width direction of the back barrier band is a root portion fixed to the vicinity of the upper edge of the back end flap portion, and a portion on the other side in the width direction extends from the root portion. It is considered as an extension part
Of the both ends in the width direction of the extended portion and the intermediate portion in the width direction, the both ends in the width direction are a base end side portion and a base end side portion extending from the edge on the base portion side to the center in the front-rear direction. So as not to be separated from the dorsal end flap portion in a double-folded state having a front end side portion that is folded back from the edge on the center side in the front-rear direction to the body side and extends to the vicinity of the upper edge of the dorsal end flap portion. The fixed width portion is a non-fixed free portion that can be separated from the back end flap portion, and an elastic stretchable member extends along the width direction at least at the tip of the free portion. Fixed in a state,
A disposable disposable diaper characterized by that.   The joint according to claim 1, wherein the joint portion for welding the root portion of the back barrier band and the member on the back side thereof is provided in a continuous line shape over the entire width direction of the root portion of the back barrier band. Wearable disposable diapers. Side barrier cuffs that stand on the use surface side are provided on both sides of the diaper along the front-rear direction.
Each side barrier cuff is a fixed portion in which the outer portion in the width direction is fixed to the side portion of the diaper, and both of the inner portions in the width direction are fixed portions that are fixed to the diaper in the front-rear direction. The front-rear direction range between the fixed parts is a free part,
Elastic fixing members around the legs are respectively provided along the front-rear direction on the fixing portion on the outer side in the width direction of each side barrier cuff,
The length in the front-rear direction of the dorsal end flap portion is the same as or shorter than the length in the front-rear direction of the fastening piece mounting portion,
The length in the front-rear direction in the deployed state of the free portion of the back-side barrier band is the same as or shorter than the length in the front-rear direction of the back-side end flap portion,
The width direction length of the free portion of the back barrier band is longer than the distance in the width direction of the free ends of the left and right side barrier cuffs when the diaper is deployed, and the width of the elastic elastic members around the left and right legs. Shorter than the direction separation distance,
The elastic elastic member of the back side barrier band is fixed so as to extend over the entire width direction of the free part of the back side barrier band and stretched by 150 to 190%.
The fixed disposable diaper according to claim 1 or 2.

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