JP2008055002A - Fastening type paper diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent slipping down of a diaper. <P>SOLUTION: A coefficient of dynamic friction on the inner surface 1 of an abdominal-side side flap part FF is made to be higher than a coefficient of dynamic friction on the outer surface 2 of the abdominal-side side flap part FF, and a coefficient of dynamic friction on the inner surface 3 of a back-side side flap part BF is made to be not smaller than the coefficient of dynamic friction on the outer surface 2 of the abdominal-side side flap part FF. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stationary paper diaper.

Fixed-type disposable diapers are widely used especially for infants and nursing care. Many fixed-type disposable diapers have an absorbent main body that absorbs and holds excrement, extending from the waist end on the ventral side to the waist end on the back side through the crotch, and the ventral side of the absorbent main body Provided on the abdomen side flap part extending laterally from both sides of the body, the back side flap part extending laterally from the back side part of the absorbent main body part, and the back side flap part When installing, lock the dorsal side flap part on the ventral outer surface with the dorsal side flap part overlaid on the ventral side flap part. To do.
Such a stationary paper diaper is easy to slip down during mounting. For this reason, conventionally, rubber thread or urethane has been arranged along the waist end, but further improvement has been demanded.
And in recent years, by increasing the frictional force in the overlapping part of the back side flap part and the abdominal side flap part (Patent Document 1), or by providing a non-slip (Patent Document 2), displacement and twisting in the overlapping part can be prevented. It has also been proposed to prevent diaper misalignment.
JP 2004-350756 A JP 2004-181014 A

However, merely preventing displacement and twisting at the overlapping portion of the back side flap portion and the abdominal side flap portion is insufficient to prevent the diaper from falling.
Therefore, a main problem of the present invention is to prevent the diaper slippage more effectively.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorbent main body that absorbs and holds excrement, extending from the upper edge of the abdominal side to the upper edge of the dorsal side along the center in the width direction;
On both sides of the upper edge side portion on the ventral side, a pair of ventral side flap portions extending to the outside in the width direction from the crotch portion, and
On both sides of the upper edge side portion on the back side, a pair of back side flap portions extending to the outside in the width direction from the crotch portion, and
A locking member provided on the back side flap portion,
In a stationary paper diaper configured to be mounted by locking the locking member to the outer surface of the ventral side with the dorsal side flap portion overlapped on the outside of the ventral side flap portion,
The dynamic friction coefficient on the inner surface of the ventral side flap portion is higher than the dynamic friction coefficient on the outer surface of the ventral side flap portion,
This is a fixed-type disposable diaper.

(Function and effect)
In this invention, since the frictional force of the surface contact | abutted to a wearer's skin becomes high, the effect which suppresses the gap | deviation shift of a diaper directly is exhibited. Therefore, it is possible to more effectively prevent the diaper from falling.
In addition, the dynamic friction coefficient in this invention means the value measured based on the method as described in 3.1 of JISP8147.

<Invention of Claim 2>
The fixed-type disposable diaper according to claim 1, wherein a dynamic friction coefficient on an inner surface of the ventral side flap portion is 1.0 to 2.5, and a dynamic friction coefficient on an outer surface of the ventral side flap portion is less than 0.6. .

(Function and effect)
It is particularly preferable that the specific dynamic friction coefficient of the side flap portion is within the range described in this section.

<Invention of Claim 3>
The fixed-type disposable diaper according to claim 1 or 2, wherein a plurality of dot-like or linear anti-slip resins are fixed to the inner surface of the ventral side flap portion at intervals.

(Function and effect)
When providing a difference in the dynamic friction coefficient of the side flap portion according to the present invention, it is preferable to fix a plurality of non-slip resins at intervals as described in this section. The dynamic friction coefficient can be increased without impairing the air permeability.

<Invention of Claim 4>
The stationary paper diaper according to any one of claims 1 to 3, wherein a dynamic friction coefficient on an inner surface of the back side flap portion is equal to or greater than a dynamic friction coefficient on an outer surface of the ventral side flap portion.

(Function and effect)
According to the invention described in this section, since the frictional force at the overlapping portion of the back side flap portion and the abdominal side flap portion is increased, it is possible to prevent the diaper from being lowered due to the displacement of the overlapping portion.

<Invention of Claim 5>
The fixed-type disposable diaper according to claim 4, wherein a coefficient of dynamic friction on an inner surface of the back side flap portion is 0.6 to 1.0.

(Function and effect)
It is particularly preferable that the specific dynamic friction coefficient of the side flap portion is within the range described in this section.

<Invention of Claim 6>
The fixed-type paper diaper according to claim 4 or 5, wherein a plurality of dot-like or linear anti-slip resins are fixed to the inner surface of the back side flap portion at intervals.

(Function and effect)
When providing a difference in the dynamic friction coefficient of the side flap portion according to the present invention, it is preferable to fix a plurality of non-slip resins at intervals as described in this section. The dynamic friction coefficient can be increased without impairing the air permeability.

<Invention of Claim 7>
The absorbent main body portion includes a liquid-permeable top sheet that forms an inner surface, a liquid-impermeable sheet sheet that is positioned on the outer surface side, and an absorbent element interposed therebetween, and the abdomen side The fastening type disposable diaper according to any one of claims 1 to 6, wherein an inner surface and an outer surface of each of the side flap portion and the back side flap portion are each formed of a nonwoven fabric.

(Function and effect)
The present invention is suitable for such a stationary paper diaper.

  As described above, according to the present invention, various advantages are brought about, such as a more effective prevention of diaper slippage.

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 paper diaper according to the present invention. FIG. 2 is a view taken along line B-B in FIG. The fixed-type disposable diaper extends along the center in the width direction from the upper edge F1 of the abdominal side F through the crotch part C to the upper edge B1 of the dorsal side B, and absorbs and holds the excretory body part 10 , On both sides of the upper edge F1 side portion of the ventral side F, a pair of abdominal side flap portions FF, FF extending to the outside in the width direction from the crotch portion C, and both sides of the upper edge B1 side portion of the back side B Are provided with a pair of dorsal side flap portions BF, BF extending to the outside in the width direction from the crotch portion C. 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 protruding from the side edge of the absorbent element 50 in the liquid-impermeable sheet 11 is fixed with a hot melt adhesive or the like. The liquid-impermeable sheet 11 is formed to be slightly wider than the top sheet 30.

  Further, barrier cuffs 60, 60 projecting (standing) toward the wearer's skin are provided on both sides of the absorbent main body 10, and barrier sheets 64, 64 forming the barrier cuffs 60, 60 are provided. The inner side of the absorbent main body 10 is extended over the entire width including the inner surfaces of the side flap portions BF and FF on the back side and the ventral side.

Hereinafter, the material and characteristic parts of each part will be described 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, laminated nonwoven fabrics such as SMS nonwoven fabrics and SMMS nonwoven fabrics are preferred 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.

(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)
In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent body, an intermediate sheet that is generally referred to as a “second sheet” between the top sheet 30 and the absorbent element 50 and has a higher liquid transmission rate than the top sheet 30 40 can be provided. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.
Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
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 length of the absorbent element 50 or may be within a short length range centered on the region that receives the liquid. A typical material of the intermediate sheet 40 is a nonwoven fabric having excellent liquid permeability.

(Barrier cuffs)
In order to prevent urine and soft stool that move laterally on the top sheet 30 and prevent side leakage, barrier cuffs 60, 60 that protrude (stand up) on the use surface side are provided on both sides of the product. preferable.
The barrier cuff 60 includes 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. An elastic elastic member 66 such as a rubber thread is provided along the front-rear direction between the sheets of the portion where the barrier sheet 64 and the exterior sheet 12 face each other in the vicinity of the fixing start end of the fixing portion.
Around the legs, the inner side in the width direction from the sticking start end of the barrier cuff 60 is fixed on the top sheet 30 at both ends in the product front-rear direction, but the portion between them is an unfixed free portion, and this free portion is It comes to stand by the contraction force of the rubber thread 62. When the diaper is worn, the diaper is worn on the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the diaper, so that the barrier cuff 60 stands up and comes into close contact with the legs around the contraction force of the rubber thread 62. As a result, so-called side leakage from around the legs is prevented.

(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 a tow (fiber bundle) such as cellulose acetate as needed can be used in addition to those obtained by stacking short fibers such as cotton pulp. The fiber basis weight can be, for example, about 30 to 120 g / m ² . The fineness of the fiber is, for example, 1 to 16 denier, preferably 1 to 10 denier, and more preferably 1 to 6 denier. 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 throughout the 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 . By setting the basis weight of the polymer to 50 g / m ² or less, it is possible to prevent the lightening effect from being hardly exhibited by adopting the synthetic continuous fiber due to the weight of the polymer. 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 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)
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 aggregate of continuous fibers 52 at the time of supply to the aggregate of continuous fibers 52 or in a subsequent process, or in a distribution process until use by a consumer. The unevenness of the superabsorbent polymer particles that have passed through the aggregate of continuous fibers gives a sense of incongruity when touched by the hand when the consumer uses it. Therefore, it is also a preferable form that a holding sheet 80 having a holding performance of the superabsorbent polymer 54 is interposed between the absorbent body 56 and the covering sheet 58.
The holding sheet 80 reinforces the stiffness that is not sufficient only by the covering sheet 58 such as tissue paper (crepe paper), and 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 plastic, polylaminated nonwoven fabric, paper, or the like joined to a diaper, and a hook element 130A of a mechanical fastener is provided as a locking portion for the ventral side at the tip side portion. ing. The hook element 130A is bonded to the fastening substrate 130C by an adhesive so as not to be peeled off. 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 a normal case, the locking portion is a rectangular range having a height of 20 to 80 mm and a width of 150 to 300 mm, and a distance in the height direction between the upper end edge and the ventral upper edge F1 is 0 to 60 mm, particularly 20 to 50 mm. And it is preferable to set it as the center of the width direction of a 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.

(About the dynamic friction coefficient of the side flaps)
In the present invention, the dynamic friction coefficient (hereinafter referred to as μ1) on the inner surface (all contacts the skin) 1 of the ventral side flap portion FF is the dynamic friction coefficient (hereinafter referred to as μ2) on the outer surface 2 of the ventral side flap portion FF. To be higher). More preferably, the dynamic friction coefficient (hereinafter referred to as μ3) on the inner surface 3 of the back side flap portion BF (a part is in contact with the skin and the remaining portion is in contact with the outer surface of the abdominal side flap portion FF) is a ventral side flap. The dynamic friction coefficient μ2 or more on the outer surface 2 of the portion FF is set. That is, the following equation (1) is expressed as a magnitude relationship between the dynamic friction coefficients μ1 to μ3 in the preferred embodiment.
μ1 ≧ μ3> μ2 (1)
Such a magnitude relationship of the dynamic friction coefficients μ1 to μ3 includes the selection of materials (for example, non-woven fabric, film, etc.) for the inner and outer surfaces of the side flap portions FF, BF, and selection of material specifications (for example, the type of non-woven fabric, basis weight, etc.) The presence / absence and degree of surface processing such as embossing and roughening, the presence / absence and number of anti-slip resin, and the like can be set.
Specific dynamic friction coefficients μ1 to μ3 can be determined as appropriate. For example, the dynamic friction coefficient μ1 on the inner surface 1 of the ventral side flap portion FF is preferably 1.0 to 2.5, and the ventral side flap portion is preferable. The dynamic friction coefficient μ2 on the outer surface 2 of the FF is preferably less than 0.6. Further, the dynamic friction coefficient μ3 on the inner surface 3 of the back side flap portion BF is preferably set to 0.6 to 1.0.
The dynamic friction coefficient is preferably substantially the same throughout the side flap portions FF and BF (that is, the material and the like are common), but only a part (preferably 50% outside the width direction of the side flap portion). The above portion) may satisfy the above-described magnitude relationship.
In the illustrated embodiment, the inner surfaces of the side flap portions FF and BF are formed by a barrier sheet 64 that is a common material, and the outer surfaces of the side flap portions FF and BF are formed by an exterior sheet 12 that is a common material, Anti-slip resin G is fixed to the inner surface 1 of the side flap portion FF and the inner surface 3 of the back side flap portion BF in the same manner. Therefore, the dynamic friction coefficients μ1 and μ3 of the inner surface 1 of the ventral side flap portion FF and the inner surface 3 of the back side flap portion BF are substantially equal, and these dynamic friction coefficients μ1 and μ3 are the outer surfaces of the ventral side flap portion FF. The dynamic friction coefficient in 2 is higher than μ2.
As the non-slip resin G, a hot-melt resin such as natural rubber, synthetic rubber, or olefin can be used. The application area of the non-slip resin G is preferably less than 30%, particularly less than 10%, with respect to the area of the side flap portions FF and BF, from the viewpoint of air permeability.
In addition, it is preferable that the non-slip resin G is provided with a plurality of dot-like anti-slip resins G at intervals as shown in the drawing, or a plurality of linear anti-slip resins are provided at intervals, although not shown. . By providing the non-slip resin G in these forms, the dynamic friction coefficient can be increased without impairing the soft texture of the side flap portions FF and BF. When the anti-slip resin G is arranged in a linear shape, it is desirable that the anti-slip resin G be linear in the direction of the displacement drop in order to prevent the diaper from being displaced. Furthermore, if the non-slip resin G is arranged in a wavy curve, the effect can be exhibited even in the longitudinal displacement. The point area and line width of the non-slip resin G may be determined as appropriate, but the point area (one point) is preferably 0.05 to ⁵ mm ² and the line width (one) is 0.1. It is preferably ˜3 mm. In this case, the anti-slip resin G may be provided irregularly or regularly. In particular, it is preferable that the anti-slip resin G is configured so that a geometric pattern such as a heart shape or a pattern such as a character is represented.
Although not shown, instead of the non-slip resin G, a vinyl chloride film or urethane foam can be attached to the side flap portion.
On the other hand, in the illustrated embodiment, the inner surface and the outer surface of the ventral side flap portion FF are formed of the same material as the back side. However, at least one of the inner surface and the outer surface is different in the type or specification of the dorsal and ventral materials. It can be tightened.
In the illustrated embodiment, the back side and the abdomen side flap portions BF and FF are formed by extending both sides of the exterior sheet 12 on the outer surface side and both sides of the barrier sheet 64 on the inner surface side. As shown in the above, these may be extended to both sides of the absorbent main body 10 and the vicinity thereof in the width direction, and a member for forming a side flap portion may be separately connected to the end (not shown). . This form is suitable for making the material of each part different.

  The present invention is applied to a stationary paper diaper.

It is an expanded state top view of a fixed type paper diaper. It is the BB sectional view taken on the line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Absorbent main-body part, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 52 ... Fiber, 54 ... Super absorbent polymer particle, 56 ... Absorption Body, 58 ... covering sheet, 60 ... barrier cuff, 64 ... barrier sheet, 80 ... holding sheet, G ... non-slip resin.

Claims (7)

An absorbent main body that absorbs and holds excrement, extending from the upper edge of the abdominal side to the upper edge of the dorsal side along the center in the width direction;
On both sides of the upper edge side portion on the ventral side, a pair of ventral side flap portions extending to the outside in the width direction from the crotch portion, and
On both sides of the upper edge side portion on the back side, a pair of back side flap portions extending to the outside in the width direction from the crotch portion, and
A locking member provided on the back side flap portion,
In a stationary paper diaper configured to be mounted by locking the locking member to the outer surface of the ventral side with the dorsal side flap portion overlapped on the outside of the ventral side flap portion,
The dynamic friction coefficient on the inner surface of the ventral side flap portion is higher than the dynamic friction coefficient on the outer surface of the ventral side flap portion,
This is a fixed-type disposable diaper.   The fixed-type disposable diaper according to claim 1, wherein a dynamic friction coefficient on an inner surface of the ventral side flap portion is 1.0 to 2.5, and a dynamic friction coefficient on an outer surface of the ventral side flap portion is less than 0.6. .   The fixed-type disposable diaper according to claim 1 or 2, wherein a plurality of dot-like or linear anti-slip resins are fixed to the inner surface of the ventral side flap portion at intervals.   The stationary paper diaper according to any one of claims 1 to 3, wherein a dynamic friction coefficient on an inner surface of the back side flap portion is equal to or greater than a dynamic friction coefficient on an outer surface of the ventral side flap portion.   The stationary paper diaper according to claim 4, wherein a dynamic friction coefficient on an inner surface of the back side flap portion is 0.6 to 1.0.   The fixed-type paper diaper according to claim 4 or 5, wherein a plurality of dot-like or linear anti-slip resins are fixed to the inner surface of the back side flap portion at intervals.   The absorbent main body portion includes a liquid-permeable top sheet that forms an inner surface, a liquid-impermeable sheet sheet that is positioned on the outer surface side, and an absorbent element interposed therebetween, and the abdomen side The fastening type disposable diaper according to any one of claims 1 to 6, wherein an inner surface and an outer surface of each of the side flap portion and the back side flap portion are each formed of a nonwoven fabric.

Images