JP6456999B2 - Tape type disposable diaper - Google Patents

Description

  The present invention relates to a so-called tape-type disposable diaper.

  There are mainly three types of disposable diapers: tape type, pants type, and pad type. Among these, a tape-type disposable diaper is worn by connecting a fastening tape protruding from both sides of the back side portion to the outer surface of the abdominal side portion after being applied to the body in the unfolded state.

  A general tape-type disposable diaper includes a main body having a ventral part extending to the front side from the center in the front-rear direction, a back side part extending to the rear side from the center in the front-rear direction, and both sides of the back side part. Each has a fastening tape that protrudes, and has a structure in which the fastening tape is rotated from both sides of the waist to the outer surface of the abdominal portion and connected to the outer surface of the abdominal portion when worn on the body. Such a tape-type disposable diaper is used not only for infants but also widely used for nursing care (adult use).

  The tape-type disposable diaper is inferior in the fit in the trunk direction as compared with the pants-type disposable diaper. For this reason, it has been proposed to improve the fit around the waist by providing a stretchable region in the width direction on the waist portion of the back side portion, or by providing a stretchable region in the width direction on the fastening tape (for example, patents). References 1-3).

  In particular, it is preferable to provide a stretchable region in the width direction in the waist portion of the back side portion and provide a stretchable region in the width direction on the fastening tape because stretchability can be imparted over a wider range.

  However, as described in detail in Patent Document 3, a waist stretchable sheet is formed when a waist stretchable sheet having a stretchability in the width direction is incorporated in the waist portion of the back portion to form a stretchable region in the width direction. When stretchable up to both ends in the width direction, wrinkles and creases occur at both ends in the width direction of the waist stretchable sheet at the time of manufacture, which may deteriorate the appearance in the product state.

  For this reason, conventionally, a stretchable region could not be provided over the entire width direction of the waist stretchable sheet, and sufficient stretchability could not be provided around the waist using only the waist stretchable sheet. Further, even if the fastening tape is provided with an expansion / contraction region, it is difficult to form a continuous expansion / contraction region across the left and right fastening tapes because the expansion / contraction regions of the two are spaced apart from each other in the width direction.

JP 2010-22550 A JP-A-2005-152168 JP 2008-29749 A JP 2011-072736 A

  Then, the main subject of this invention is to make the expansion-contraction range of a waist elastic sheet wide in order to improve the fit property around the trunk | drum.

The typical embodiments of the present invention that have solved the above problems are as follows.
<First aspect>
A body having a ventral part extending to the front side of the front-rear direction center, and a back side part extending to the rear side of the front-rear direction center;
Fastening tape that protrudes from both sides of the waist portion of the back portion,
It has a waist elastic sheet provided in the waist part of the back side part,
The fastening tape has a base end portion attached to a waist portion of the back portion and a connecting portion detachably connected to an outer surface of the ventral portion,
The waist stretchable sheet has a non-stretchable region at both ends in the width direction, and a portion between these non-stretchable regions is a body stretchable region that stretches in the width direction.
In tape-type disposable diapers,
The main body has a folded portion in which a side portion including a portion having the non-stretchable region is folded and fixed to the center side.
A tape-type disposable diaper characterized by that.

(Function and effect)
In this aspect, since the portion having the non-stretchable region in the main body is folded back and fixed to the center side, the width of the non-stretchable region of the waist stretchable sheet occupying the width of the main body is inevitably formed. be able to. As a result, the stretchable range of the waist stretchable sheet can be widened.

<Second aspect>
The fastening tape has a tape expansion / contraction region that expands and contracts in the width direction provided in a portion between the base end portion and the connecting portion,
The fastening tape is attached to the main body such that the base end of the tape elastic region is located within a range of ± 5 mm in the width direction from the side edge of the main elastic region.
The tape type disposable diaper of a 1st aspect.

(Function and effect)
In this aspect, since the portion having the non-stretchable region in the main body is folded back and fixed to the center side, the width of the non-stretchable region of the waist stretchable sheet occupying the width of the main body is inevitably formed. be able to. As a result, the continuity of the stretchable region across the left and right fastening tapes can be improved.

<Third Aspect>
The body is
An absorber,
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
A side flap portion located outside the side edge of the absorber;
A root portion fixed to the region including the side flap portion, a gather sheet that forms a protruding portion extending from the root portion, and a lying portion in which both end portions in the front-rear direction of the protruding portion are fixed in a lying state, A rising gather having an unfixed rising portion located between the front and rear lying portions of the protruding portion, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the rising portion;
With
The waist stretchable sheet has the body stretchable region extending over the left and right side flaps,
The side flap portion is a portion where the gather sheet, the liquid-impermeable sheet, the waist stretchable sheet, and the exterior sheet are laminated,
The folded portion is formed in the side flap portion, the gather sheet, at least a part of the non-stretchable region of the waist stretchable sheet, and the portion where the exterior sheet is folded to the front side,
Wherein the back surface parts component having the folded portion in the side flaps, the base end portion of the fastening tape is attached,
The tape type disposable diaper of a 2nd aspect.

(Function and effect)
When the part which has a waist elastic sheet and a fastening tape like this aspect is provided, a folding | returning part can be made into a structure like this aspect. In this case, the base end portion of the fastening tape, by being attached to the rear surface parts component having a folded portion of the side flaps, as the strength of the portion forces in use is concentrated (the attachment portion of the fastening tape) is high In addition, there is an advantage that a force for peeling off the folded portion is not applied. Or the base end part of a fastening tape is not attached to the skin side, and the touch of the skin side surface is not impaired.

<Fourth aspect>
The body is
An absorber,
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
A side flap portion located outside the side edge of the absorber;
A root portion fixed to the region including the side flap portion, a gather sheet that forms a protruding portion extending from the root portion, and a lying portion in which both end portions in the front-rear direction of the protruding portion are fixed in a lying state, A rising gather having an unfixed rising portion located between the front and rear lying portions of the protruding portion, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the rising portion;
With
The waist stretchable sheet has the body stretchable region extending over the left and right side flaps,
The side flap portion is a portion where the gather sheet, the liquid-impermeable sheet, the waist stretchable sheet, and the exterior sheet are laminated,
The folded portion is a portion where the side flap portion is formed, at least a part of the non-stretchable region of the waist stretchable sheet, and the exterior sheet folded back to the front side,
The front side of the folded portion is covered with a side portion of the gather sheet,
A base end portion of the fastening tape is attached between the folded portion and the side portion of the gather sheet in the side flap portion,
The tape type disposable diaper of a 2nd aspect.

(Function and effect)
When the part which has a waist elastic sheet and a fastening tape like this aspect is provided, a folding | returning part can be made into a structure like this aspect. In this case, since the base end portion of the fastening tape is attached to the folded portion of the side flap portion, the strength of the portion where the force is concentrated during use (attachment portion of the fastening tape) becomes high. Alternatively, the base end portion of the fastening tape is not exposed, and the front side of the folded portion is covered with the side portion of the gather sheet, and the hard material such as the exterior sheet is not exposed, so that the touch is not impaired.

<Fifth aspect>
The body is
An absorber,
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
A side flap portion located outside the side edge of the absorber;
A root portion fixed to the region including the side flap portion, a gather sheet that forms a protruding portion extending from the root portion, and a lying portion in which both end portions in the front-rear direction of the protruding portion are fixed in a lying state, A rising gather having an unfixed rising portion located between the front and rear lying portions of the protruding portion, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the rising portion;
With
The waist stretchable sheet has the body stretchable region extending over the left and right side flaps,
The side flap portion is a portion where the gather sheet, the liquid-impermeable sheet, the waist stretchable sheet, and the exterior sheet are laminated,
The folded portion is formed in the side flap portion, the gather sheet, at least a part of a non-stretchable region of the waist stretchable sheet, and a portion where the exterior sheet is folded back,
Wherein the back surface parts component having the folded portion in the side flaps, the base end portion of the fastening tape is attached,
The tape type disposable diaper of a 2nd aspect.

(Function and effect)
When the part which has a waist elastic sheet and a fastening tape like this aspect is provided, a folding | returning part can be made into a structure like this aspect. In this case, since the base end portion of the fastening tape is attached to the folded portion of the side flap portion, the strength of the portion where the force is concentrated during use (attachment portion of the fastening tape) becomes high. Moreover, the surface side of a skin side is not impaired by the front side of a folding | turning part consisting of a gather sheet, and the base end part of a fastening tape not being attached to the skin side.

<Sixth aspect>
The folded portion does not include the liquid-impermeable sheet;
The tape type disposable diaper of any one aspect of 3rd-5th.

(Function and effect)
Since the folded portion increases in thickness and tends to become hard, it is preferable to have a structure that does not include a liquid-impermeable sheet that tends to become particularly hard.

  As described above, according to the present invention, it is possible to provide a wide range of expansion and contraction of the waist stretchable sheet, thereby bringing about advantages such as an improved fit around the waist.

It is a top view in the state where the diaper was developed showing the inner surface of a tape type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a tape type disposable diaper. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. (A) 7-7 sectional drawing of FIG. 1, (b) 8-8 sectional drawing of FIG. (A) Top view of a waist elastic sheet, (b) Cross section of a waist elastic sheet, (c) Top view of a fastening tape, ( d ) It is sectional drawing of a fastening tape. It is sectional drawing which expands and shows the principal part of a side gather part. It is sectional drawing which expands and shows the part which has a waist elastic sheet and a fastening tape. It is sectional drawing which expands and shows the part which has a waist elastic sheet and a fastening tape in another form. It is sectional drawing which expands and shows the part which has a waist elastic sheet and a fastening tape in another form.

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

  1-7 has shown an example of the tape type disposable diaper. This tape-type disposable diaper has a ventral part F extending forward from the front-rear direction center C and a dorsal part B extending rearward from the front-rear center C. The absorbent body 56 provided in the intermediate part in the width direction WD over the side portion B, the liquid-permeable top sheet 30 covering the front side of the absorbent body 56, and the liquid-impermeable sheet 11 covering the back side of the absorbent body 56 And a fastening tape 13 for connecting the abdominal part F and the back part B projecting from both sides of the waist part of the back part B of the main body 10. The main body 10 includes an end flap portion EF that does not have the absorber 56 and extends to the front side and the rear side from the absorber 56, and a side flap portion SF that does not have the absorber 56 and extends to the side. Have.

(Body)
The body 10 is like a general tape-type disposable diaper, and the width of the waist part of the abdominal part F and the back part B is wider than the width of the crotch part (in other words, the constricted part along the leg part). In order to eliminate the need for cutting, the diaper width is the same as the width of the crotch portion over the entire length (in other words, having a constricted portion). It is also a preferable form to have a rectangular shape.

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

  Furthermore, rising gathers 60 and 60 that rise on the skin side of the wearer are provided on both sides of the surface of the main body 10 in the width direction WD, and the gather sheets 62 and 62 that form the rising gathers 60 and 60 are the tops. The sheet 30 extends from both side portions to the side flap portions SF.

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

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film. Non-woven fabrics that ensure liquid impermeability (in this case, liquid impervious sheets are composed of waterproof films and non-woven fabrics). Of course, in addition to this, materials having liquid impermeability and moisture permeability which have been used and used in recent years from the viewpoint of preventing stuffiness can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leakage resistance by reducing the voids of the fiber by applying heat or pressure, and applying water-repellent resin or hydrophobic resin or water repellent to waterproof A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

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

(Top sheet)
As the top sheet 30, a liquid permeable material such as a porous or non-porous nonwoven fabric or a porous plastic sheet can be used. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, the spun lace method is a preferable processing method for obtaining flexibility and drapeability, and the thermal bond method is for obtaining bulkiness and softness.

  The top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

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

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

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

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

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

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimp of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per 2.54 cm. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

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

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

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

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

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

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

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

(Side gather)
As shown in FIGS. 2, 3 and 7, in order to improve the fit of the leg periphery portion located in the middle of the front-and-rear direction LD of the side portion of the main body 10, In the illustrated example, a side elastic member 70 extending in the front-rear direction LD is provided between an exterior sheet 12 and the liquid-impermeable sheet 11 of the folded portion 80 described later, or between the gather sheet 62 and the liquid-impermeable sheet 11. The side elastic member 70 is expanded and contracted so that a portion having the side elastic member 70 (that is, a folded portion 80 described later in the illustrated example) expands and contracts in the front-rear direction LD.

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

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

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

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

(Waist elastic sheet)
Between both fastening tapes 13, a belt-like waist stretchable sheet 90 extending between the left and right side flap portions SF is provided, and the back portion B is elastically stretched in the width direction WD. The waist stretchable sheet 90 has non-stretchable regions 96 at both ends in the width direction WD, and a portion between the non-stretchable regions 96 is a body stretchable region 95 that stretches in the width direction WD. is there. The waist stretchable sheet 90 may be located only in the end flap portion EF, but when the waist stretchable sheet 90 is disposed so as to extend from the end flap portion EF to the rear end portion of the absorber 56 as illustrated, the absorber 56. This is preferable because the rear end is firmly pressed against the body.

  The waist elastic sheet 90 may use a sheet-like elastic member such as a rubber sheet, but it is preferable to use a nonwoven fabric from the viewpoint of air permeability. In this case, a sheet-like elastic member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIG. 6, a sheet layer 91 such as two nonwoven fabrics is pasted with an adhesive such as a hot melt adhesive. In addition, a material in which an elastic member 92 such as a perforated sheet, net, or elongated (thread or string) is fixed between the sheet layers 91 in a state of extending along the width direction WD is preferably used. . In this case, as the material of the sheet layer 91, the same material as the exterior sheet 12 can be used. The elongation rate of the elastic member 92 is preferably about 150 to 250%. In addition, when an elongated member (thread-like or string-like) is used as the elastic member 92, it is preferable to provide about 5 to 15 pieces having a thickness of 420 to 1120 dtex with a spacing of 3 to 10 mm in the front-rear direction.

  Although the dimensions of the main body stretchable region 95 and the non-stretchable region 96 in the waist stretchable sheet 90 can be determined as appropriate, the width of the main body stretchable region 95 is 70 to 100% of the width between the connecting portions 13A of the left and right fastening tapes 13 described later. The width of the non-stretchable region 96 is preferably about 5 to 40 mm in order to prevent shrinkage or turning-up when attached to the main body 10. The non-stretchable region 96 may be a region that does not have the elastic member 92, but as described in Patent Document 3, the elastic member 92 is attached over the main body stretchable region 95 and the non-stretchable region 96, and the non-stretchable region 96 has the elastic member 92. The elastic member 92 may remain in the non-stretchable region 96, for example, or may be structured so as not to stretch or contract at all.

  Further, the elastic member 92 may be arranged so that a part of the elastic member 92 crosses the absorber 56. However, as shown in FIG. Therefore, if the structure is such that the elastic member 92 remains but hardly or does not expand or contract at all, the rear end portion of the absorbent body 56 does not contract in the width direction, so that the fit is further improved.

  The waist stretchable sheet 90 is arranged between the liquid-impermeable sheet 11 and the exterior sheet 12 in the illustrated form, but is not particularly limited to this arrangement. For example, the waist stretchable sheet 90 may be disposed between the liquid-impermeable sheet 11 and the absorbent element 50 or may be provided outside the exterior sheet 12. When the exterior sheet 12 is formed by stacking a plurality of sheet layers, the entire waist elastic sheet 90 may be provided between the sheet layers of the exterior sheet 12.

(Fastening tape)
The fastening tape 13 protrudes from both sides of the waist part of the back part B, and is connected to the base end part 13B attached to the waist part of the back part B and the outer surface of the stomach part F. And a connecting portion 13A that is detachably connected. In order to improve the fit around the trunk, in the illustrated example, at least a portion between the base end portion 13B and the coupling portion 13A is provided with a tape stretchable region 13E that stretches in the width direction WD. A known fastening tape that does not have a tape stretchable region can also be employed.

  As the connecting portion 13A of the fastening tape 13, a hook material (male material) of a mechanical fastener (surface fastener) may be provided, or an adhesive layer may be provided. The hook material has a large number of engaging protrusions on its connecting surface, and the engaging protrusions are (A) letter-shaped, (B) J-shaped, (C) mushroom-shaped, (D) There are T-shape, (E) double J-shape (shape in which J-shape is joined back to back), etc., but any shape may be used. When attaching the diaper, the connecting portion 13A of the fastening tape 13 is connected to an appropriate position on the outer surface of the abdominal portion F with the side flap portion SF of the back portion B overlapped on the outside of the side flap portion SF of the abdominal portion F. To do.

  The fastening tape 13 can be provided with a tape stretchable region 13E in which at least a portion between the base end portion 13B and the connecting portion 13A is stretched in the width direction WD. The elongation ratio of the tape stretchable region 13E is not particularly limited, but is preferably about 150 to 250%. The structure of the tape stretchable region 13E is not particularly limited. For example, at least the elastic stretchable portion of the fastening tape 13 can be formed using a sheet having elasticity by itself such as a rubber sheet or a stretchable nonwoven fabric. . In addition, as illustrated in FIGS. 6C and 6D, the sheet layer 13S such as two nonwoven fabrics is bonded with an adhesive such as a hot melt adhesive, and a perforated sheet is provided between the sheet layers 13S. Forming at least the tape expansion / contraction region 13E of the fastening tape 13 by using an elastic member 13G having a shape, net shape, elongated shape (thread shape, string shape, etc.) fixed in a stretched state in the width direction WD. Is preferred. In this way, a plurality of elongated elastic members 13G attached to the sheet layer 13S with a space therebetween are widely used in the technical field of disposable diapers. There is also an advantage that the shrinkage characteristics of the fastening tape 13 can be easily adjusted by making the thickness, number, elongation rate, interval, and type of material different. In this case, as the material of the sheet layer 13S, the same material as the exterior sheet 12 can be used. Further, when an elongated member (thread-like or string-like) is used as the elastic member 13G, for example, about 5 to 15 members having a thickness of 420 to 1120 dtex can be provided at intervals of 3 to 10 mm in the front-rear direction.

  The tape stretchable region 13E is provided over the entire width direction WD of the fastening tape 13 (that is, including the base end portion 13B and the connecting portion 13A) as long as it is provided at least in a portion between the base end portion 13B and the connecting portion 13A. However, if the base end portion 13B and the connecting portion 13A contract, the connection of the connecting portion 13A may be insufficient, and a joining failure of the base end portion 13B may occur. It is preferable that it is provided in the range of 70 to 100% of the width direction WD range between the connecting portion 13A and the connecting portion 13A. In this case, the base end portion 13B and the connecting portion 13A may be a region that does not have the elastic member 13G, but the elastic member 13G is attached over the entire width direction WD of the fastening tape 13, and the base end portion 13B and the connecting portion 13A are elastic. Although the elastic member 13G remains on the base end portion 13B and the connecting portion 13A by cutting the member 13G or the like, a structure that hardly or not expands or contracts may be used.

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

(Folded part)
Characteristically, the main body 10 has a folded portion 80 in which a side portion including a portion having the non-stretchable region 95 of the waist stretchable sheet 90 is folded and fixed to the center side. The fastening tape 13 is arranged so that the base end of the tape stretchable region 13E is located within a range A1 of ± 5 mm in the width direction WD from the side edge of the body stretchable region 95, more preferably within a range A1 of ± 2 mm. Is attached. Thereby, the width (unavoidably formed) of the non-stretchable region 95 of the waist stretchable sheet 90 occupying the width of the main body 10 can be reduced. Moreover, when the fastening tape 13 has the tape expansion-contraction area | region 13E, the continuity of the expansion-contraction area | region over the right and left fastening tape 13 can be improved.

  The base end portion 13 </ b> B of the fastening tape 13 may be connected to a position overlapping the main body stretchable region 95 or may be disposed adjacent to the side edge of the main body stretchable region 95. The joining between the base end portion 13B of the fastening tape 13 and the main body 10 is preferably formed in an elongated shape along the front-rear direction LD as in the illustrated example, and is preferably strong, so that ultrasonic sealing or heat It is preferably made by welding such as a seal, but may be made by a hot melt adhesive. Further, the folded portion 80 is provided in a part of the width direction WD of the side flap portion SF, but the entire width direction WD of the side flap portion SF or the center side in the width direction WD of the side flap portion SF. It may extend to.

  The folded portion 80 may include an end portion of the main body stretchable region 95 or may include only a part of the non-stretchable region 96. In other words, the folding position is preferably located at the boundary between the main body stretchable region 95 and the non-stretchable region 96, but although not shown, it may be located at the center side of the boundary, but also outside the boundary as in the illustrated example. May be located. In a normal case, the folding position is preferably located within a range A2 of ± 5 mm, more preferably within a range A2 of ± 2 mm in the width direction WD with reference to the boundary between the main body stretchable region 95 and the non-stretchable region 96. .

When the folded portion 80 is formed simply by folding the side portion of the main body 10, the number of laminated materials increases, and the fastening tape 13 that has not been exposed between the points that have been sandwiched between the materials is exposed. There are points to be considered, such as the exterior sheet 12 that emphasizes strength over flexibility and the skin side surface. Therefore, as one preferred embodiment, as shown in the examples shown in FIGS. 4 and 8, the waist stretchable sheet 90 has a body stretchable region 95 extending over the left and right side flap portions SF, and the side flap portion SF is composed of a gather sheet 62. The liquid-impermeable sheet 11, the waist elastic sheet 90, and the exterior sheet 12 are laminated, and the folded portion 80 is formed on the side flap portion SF, and the gather sheet 62 and the waist elastic sheet 90 are not formed. at least a portion of the expansion region 96, and a portion of the outer sheet 12 is folded back on the front side, the back surface parts component having a folded portion 80 of the side-flap portions SF, base end portion 13B of the fastening tape 13 is attached A form is proposed.

When folded portion 80 is made such a structure, the base end portion 13B of the fastening tape 13, by being attached to the rear surface parts component having a folded portion 80 of the side flaps SF, the force at the time of use Not only does the strength of the concentrated portion (attachment portion of the fastening tape 13) become high, but there is also an advantage that the force to peel off the folded portion 80 is not applied. Or since the base end part 13B of the fastening tape 13 is not attached to the skin side, the touch of the skin side surface is not impaired.

  Further, as shown in FIG. 9, the folded portion 80 is formed in the side flap portion SF, and is a portion where at least a part of the non-stretchable region 96 of the waist stretchable sheet 90 and the exterior sheet 12 are folded to the front side. Yes, the front side of the folded portion 80 is covered with the side portion of the gather sheet 62, and the base end portion 13B of the fastening tape 13 is located between the folded portion 80 and the side portion of the gather sheet 62 in the side flap portion SF. The attached form is also one preferred form. In this case, since the base end portion 13B of the fastening tape 13 is attached to the folded portion 80 in the side flap portion SF, the strength of the portion where the force is concentrated during use (attachment portion of the fastening tape 13 in the folded portion 80). Is expensive. Alternatively, the base end portion 13B of the fastening tape 13 is not exposed, and the front side of the folded portion 80 is covered with the side portion of the gather sheet 62, and the hard material such as the exterior sheet 12 is not exposed, so that the touch is impaired. There is nothing.

Further, as shown in FIG. 10, the folded portion 80 is formed in the side flap portion SF, and at least a part of the gather sheet 62, the non-stretchable region 96 of the waist stretchable sheet 90, and the exterior sheet 12 are folded back. a portion, on the rear surface parts component having a folded portion 80 of the side flaps SF, it is also preferable for the base end portion 13B of the fastening tape 13 is attached. In this case, since the base end portion 13B of the fastening tape 13 is attached to the folded portion 80 in the side flap portion SF, the strength of the portion where the force is concentrated during use (attachment portion of the fastening tape 13 in the folded portion 80). Is expensive. Moreover, the surface side of the skin side is not impaired by the front side of the folding | returning part 80 consisting of the gather sheet 62, and the base end part 13B of the fastening tape 13 not being attached to the skin side.

  On the other hand, since the folded portion 80 tends to increase in thickness and become hard, all of the sheets constituting the folded portion 80 may extend to the tip of the folded portion 80 (the edge on the center side in the width direction WD). Instead, it is preferable that some sheets extend only to the middle of the folded portion 80 in the width direction WD. For example, in the illustrated example, the exterior sheet 12 extends to the tip of the folded portion 80, but the waist stretchable sheet 90 extends only partway through the folded portion 80, so that the flexibility of the folded portion 80 is unlikely to be impaired.

  From such a viewpoint, it is preferable that the folded portion 80 does not include the liquid-impermeable sheet 11 that is particularly likely to be hard, as in the illustrated example.

  In the above example, the side portion of the main body 10 is folded back in the width direction WD over the entire front-rear direction LD, but the folded portion 80 may be formed by folding only a part including the waist stretchable sheet 90.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-“Deployed state” means a state in which a natural length is extended and completely flattened without contraction or sagging.
“Elongation rate” means a value when the natural length is 100%.
-"Gel strength" is measured as follows. Add 1.0 g of superabsorbent polymer to 49.0 g of artificial urine and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).
"Artificial urine" is urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97 0.09 wt% mixed, and used at a temperature of 37 degrees unless otherwise specified.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated and used as the basis weight.
-"Water absorption" is measured by JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ "Water absorption rate" is "Time to end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. And
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a standard laboratory (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%) in a test room or equipment. To do.
-Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.

  The present invention is applicable to a tape-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 10 ... Main body, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Fastening tape, 13A ... Connection part, 13B ... Base end part, 13E ... Tape expansion-contraction area, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gathering sheet, 62 ... Gathering sheet, 63 ... Gathering elastic member, 70 ... Side elastic member, B ... Back side part, F ... Belly Side part, EF ... End flap part, SF ... Side flap part, LD ... Front-rear direction, WD ... Width direction, 80 ... Folded part, 90 ... Waist stretchable sheet, 96 ... Non-stretchable area, 95 ... Main body stretchable area.

Claims (4)

A body having a ventral part extending to the front side of the front-rear direction center, and a back side part extending to the rear side of the front-rear direction center;
Fastening tape that protrudes from both sides of the waist portion of the back portion,
It has a waist elastic sheet provided in the waist part of the back side part,
The fastening tape has a base end portion attached to a waist portion of the back portion and a connecting portion detachably connected to an outer surface of the ventral portion,
The waist stretchable sheet has a non-stretchable region at both ends in the width direction, and a portion between these non-stretchable regions is a body stretchable region that stretches in the width direction.
In tape-type disposable diapers,
Said body, said has side including a portion having a non-stretchable region comprises a folded portion which is secured by folding back toward the center,
The fastening tape has a tape expansion / contraction region that expands and contracts in the width direction provided in a portion between the base end portion and the connecting portion,
The fastening tape is attached to the main body so that the base end of the tape elastic region is located within a range of ± 5 mm in the width direction from the side edge of the main body elastic region,
The body is
An absorber,
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
A side flap portion located outside the side edge of the absorber;
A root portion fixed to the region including the side flap portion, a gather sheet that forms a protruding portion extending from the root portion, and a lying portion in which both end portions in the front-rear direction of the protruding portion are fixed in a lying state, A rising gather having an unfixed rising portion located between the front and rear lying portions of the protruding portion, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the rising portion;
With
The waist stretchable sheet has the body stretchable region extending over the left and right side flaps,
The side flap portion is a portion where the gather sheet, the liquid-impermeable sheet, the waist stretchable sheet, and the exterior sheet are laminated,
The folded portion is formed in the side flap portion, the gather sheet, at least a part of the non-stretchable region of the waist stretchable sheet, and the portion where the exterior sheet is folded to the front side,
The base end portion of the fastening tape is attached to the back surface of the portion having the folded portion in the side flap portion,
A tape-type disposable diaper characterized by that. A body having a ventral part extending to the front side of the front-rear direction center, and a back side part extending to the rear side of the front-rear direction center;
Fastening tape that protrudes from both sides of the waist portion of the back portion,
It has a waist elastic sheet provided in the waist part of the back side part,
The fastening tape has a base end portion attached to a waist portion of the back portion and a connecting portion detachably connected to an outer surface of the ventral portion,
The waist stretchable sheet has a non-stretchable region at both ends in the width direction, and a portion between these non-stretchable regions is a body stretchable region that stretches in the width direction.
In tape-type disposable diapers,
The main body has a folded portion in which a side portion including a portion having the non-stretchable region is folded and fixed to the center side,
The fastening tape has a tape expansion / contraction region that expands and contracts in the width direction provided in a portion between the base end portion and the connecting portion,
The fastening tape is attached to the main body so that the base end of the tape elastic region is located within a range of ± 5 mm in the width direction from the side edge of the main body elastic region,
The body is
An absorber,
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
A side flap portion located outside the side edge of the absorber;
A root portion fixed to the region including the side flap portion, a gather sheet that forms a protruding portion extending from the root portion, and a lying portion in which both end portions in the front-rear direction of the protruding portion are fixed in a lying state, A rising gather having an unfixed rising portion located between the front and rear lying portions of the protruding portion, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the rising portion;
With
The waist stretchable sheet has the body stretchable region extending over the left and right side flaps,
The side flap portion is a portion where the gather sheet, the liquid-impermeable sheet, the waist stretchable sheet, and the exterior sheet are laminated,
The folded portion is a portion where the side flap portion is formed, at least a part of the non-stretchable region of the waist stretchable sheet, and the exterior sheet folded back to the front side,
The front side of the folded portion is covered with a side portion of the gather sheet,
A base end portion of the fastening tape is attached between the folded portion and the side portion of the gather sheet in the side flap portion,
This is a tape-type disposable diaper. A body having a ventral part extending to the front side of the front-rear direction center, and a back side part extending to the rear side of the front-rear direction center;
Fastening tape that protrudes from both sides of the waist portion of the back portion,
It has a waist elastic sheet provided in the waist part of the back side part,
The fastening tape has a base end portion attached to a waist portion of the back portion and a connecting portion detachably connected to an outer surface of the ventral portion,
The waist stretchable sheet has a non-stretchable region at both ends in the width direction, and a portion between these non-stretchable regions is a body stretchable region that stretches in the width direction.
In tape-type disposable diapers,
The main body has a folded portion in which a side portion including a portion having the non-stretchable region is folded and fixed to the center side,
The fastening tape has a tape expansion / contraction region that expands and contracts in the width direction provided in a portion between the base end portion and the connecting portion,
The fastening tape is attached to the main body so that the base end of the tape elastic region is located within a range of ± 5 mm in the width direction from the side edge of the main body elastic region,
The body is
An absorber,
A liquid-impermeable sheet covering the back side of the absorber;
An exterior sheet covering the back side of the liquid-impermeable sheet;
A side flap portion located outside the side edge of the absorber;
A root portion fixed to the region including the side flap portion, a gather sheet that forms a protruding portion extending from the root portion, and a lying portion in which both end portions in the front-rear direction of the protruding portion are fixed in a lying state, A rising gather having an unfixed rising portion located between the front and rear lying portions of the protruding portion, and a gather elastic member fixed in a stretched state in the front-rear direction at least at the tip of the rising portion;
With
The waist stretchable sheet has the body stretchable region extending over the left and right side flaps,
The side flap portion is a portion where the gather sheet, the liquid-impermeable sheet, the waist stretchable sheet, and the exterior sheet are laminated,
The folded portion is formed in the side flap portion, the gather sheet, at least a part of a non-stretchable region of the waist stretchable sheet, and a portion where the exterior sheet is folded back,
Wherein the back surface parts component having the folded portion in the side flaps, the base end portion of the fastening tape is attached,
This is a tape-type disposable diaper. The folded portion does not include the liquid-impermeable sheet;
Tape type disposable diaper according to any one of claims 1 to 3.

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