JP2018164630A5 - - Google Patents

Description

Tape type disposable diaper

  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, the tape-type disposable diaper is worn by connecting the connecting portions provided on the left and right sides of the back portion to the outer surface of the abdominal portion after being applied to the body in the unfolded state.

  A general tape-type disposable diaper has a ventral part extending forward from the center in the front-rear direction, and a back part extending rearward from the center in the front-rear direction. It has wing parts that extend to both sides, the ventral part and the dorsal part have an intermediate part located between the left and right wing parts, and the wing part of the dorsal part can be attached to and detached from the outer surface of the ventral part It has the connection part connected. Usually, the intermediate part is formed by a main body having an absorbent body, a liquid-permeable top sheet that covers the front side of the absorbent body, and a liquid-impermeable sheet that covers the back side of the absorbent body. The whole part or a part on the tip side is formed by a fastener assembly having a connecting part. In use, the wing portion of the back portion is turned from both sides of the waist to the outer surface of the abdominal portion, and the connecting portion of the wing portion of the back portion is connected to the outer surface of the ventral portion. 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, the body around the trunk on the back side is provided with a stretchable area in the width direction (intermediate stretchable area), and a fastener assembly is provided with a stretchable area in the width direction (side stretchable area). It has been proposed to improve the performance (see, for example, Patent Documents 1 to 3).

  For example, in the thing of patent document 1, the waist elastic sheet which expands-contracts in the width direction is incorporated in the main body in the waist part of the back side part, and the elasticity of the width direction is added to the intermediate part by this waist elastic sheet. Has been.

  Moreover, the thing of patent document 2 incorporates the waist elastic sheet which expands-contracts in the width direction in the main body in the trunk | drum circumference part of a back side part, and extends from a middle part to the base end side of a wing part by this waist elastic sheet. Elasticity in the width direction is added.

  The thing of patent document 3 has the main body which forms an intermediate part, and the side panel (fastener assembly) which protrudes from the side edge of this main body, and the connection part is provided in the front-end | tip part of this side panel. It is. The one described in Patent Document 3 has a built-in waist elastic sheet that expands and contracts in the width direction, and a side panel that expands and contracts in the width direction. The side panel adds the elasticity of the wing part. This form is preferable because it can provide stretchability over a wider range.

  However, since the conventional side panel covers the periphery of the trunk and is also a part that forms an edge around the leg, as described in Patent Document 3, the side panel extends and contracts in the width direction to the vicinity of the connecting portion. It is difficult to ensure softness in the stretchable area of the panel, and it is also necessary to ensure the dimensions in the front-rear direction of the stretchable area of the side panel more than necessary. In addition, depending on the structure of the side panel, it is necessary to cut off a part of the relatively expensive side panel in order to make the lower edge of the side panel curved along the leg.

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

  Then, the main subject of this invention is providing the tape-type disposable diaper which can make the elasticity of a side panel and the softness | flexibility of a touch compatible, and has the high freedom degree of the dimension of a side panel, and a shape.

The typical embodiments of the present invention that have solved the above problems are as follows.
<First aspect>
While having a ventral part extending to the front side from the front-rear direction center, and a dorsal part extending to the rear side from the front-rear direction center,
Having side panels attached to both sides of the dorsal part,
The side panel includes a base end portion attached to the back side portion, a connecting portion detachably connected to an outer surface of the ventral side portion, and at least a portion between the base end portion and the connecting portion. A side stretchable region extending and contracting in the width direction provided in the
In tape-type disposable diapers,
Both sides of the back portion have cover portions that protrude inward in the thickness direction of the side panel,
The cover portion covers the entire front-rear direction of the region from the base end of the side panel to the middle in the width direction of the side stretchable region, with the side stretchable region in a natural length state,
A portion excluding at least the base end portion of the side panel is not joined to the cover portion.
A tape-type disposable diaper characterized by that.

(Function and effect)
By having such a cover part, most of the inner surface of the side panel is covered with the cover part, so it is not necessary to ensure the flexibility of the touch in the stretchable area of the side panel. Thus, even if a shrinkage wrinkle is formed, the contact of the shrinkage wrinkle to the skin can be covered by the cover portion. In addition, since the edge around the leg is formed by the cover portion, it is not necessary to secure the dimension in the front-rear direction of the stretchable region of the side panel more than necessary. When the edges around the legs are curved, it is only necessary to cut the lower edge of the cover portion into a curve along the legs, which is less expensive than cutting the lower edges of the side panels. Thus, according to this aspect, the elasticity of the side panel and the softness of the touch can be compatible, and the degree of freedom of the dimension and shape of the side panel becomes high.

<Second aspect>
The side stretchable region of the side panel includes an elastic member and a sheet layer that covers both the front and back surfaces of the elastic member, and in the natural length state, the sheet layer contracts together with the elastic member so that the front and back surfaces of the sheet layer are on both sides. A shrinkage fold is formed, and in a stretched state, the sheet layer is stretched together with the elastic member so that the shrinkage fold is stretched,
A portion closer to the tip than an intermediate position between the tip of the cover portion and the connecting portion is folded over the cover portion, and the connecting portion is temporarily fixed to the cover portion.
The tape type disposable diaper of a 1st aspect.

(Function and effect)
In a tape-type disposable diaper, in a product state, it is common to fold a portion having a connecting portion toward the center in the width direction and temporarily fix the connecting portion. In a tape-type disposable diaper having a side panel, when such a connection part is temporarily fixed, the connection part is temporarily fixed to the side panel. The connecting portion is temporarily fixed to the surface having the flange, and the temporary fixing is likely to be insufficient. On the other hand, since the cover part does not have shrinkage wrinkles, if temporarily fixed to the cover part as in this aspect, the temporary fixing is unlikely to be insufficient.

<Third Aspect>
The side expansion / contraction region of the side panel includes an elastic member and a sheet layer covering both the front and back surfaces of the elastic member, and the side expansion / contraction region expands / contracts when the sheet layer expands / contracts together with the elastic member. And
The sheet layer is a nonwoven fabric having a tensile strength of 15 to 30 N / 50 mm, a tensile elongation of 40 to 90%, and a thickness of 0.100 to 0.245 mm.
The surface of the cover part is a spunbonded nonwoven fabric having a tensile strength of 20 to 35 N / 50 mm, a tensile elongation of 10 to 50%, and a thickness of 0.115 to 0.260 mm.
A portion closer to the tip than an intermediate position between the tip of the cover portion and the connecting portion is folded over the cover portion, and the connecting portion is temporarily fixed to the cover portion.
The tape type disposable diaper of a 1st aspect.

(Function and effect)
In a tape-type disposable diaper, in a product state, it is common to fold a portion having a connecting portion toward the center in the width direction and temporarily fix the connecting portion. In a tape-type disposable diaper having a side panel, when such a connecting portion is temporarily fixed, the connecting portion is temporarily fixed to the side panel, but the side panel is made of a flexible nonwoven fabric as in this embodiment. In the case of covering with a layer, the connecting portion is temporarily fixed to a weak sheet layer, and if the temporary fixing of the connecting portion is removed during use, there is a problem that the sheet layer becomes fluffy. On the other hand, when the surface of the cover portion is formed of a sufficiently strong nonwoven fabric as in this embodiment and temporarily fixed to the cover portion, fluffing is less likely to occur when the temporary fixing is removed.

<Fourth aspect>
At least the waist portion of the back portion has wing portions extending to the left and right sides,
The ventral portion and the dorsal portion have an intermediate portion located between the left and right wing portions;
The wing portion is a portion where a sheet constituting the intermediate portion extends laterally,
At least a side portion of the cover portion is formed by the wing portion;
A tape type disposable diaper according to any one of the first to third aspects.

(Function and effect)
Thus, it is preferable to form the wing portion with the sheet constituting the intermediate portion and to use the wing portion as the cover portion because it is not necessary to separately attach a member dedicated to the cover portion.

<Fifth aspect>
It has a waist elastic sheet provided in an area located between at least the side panels in the back side part,
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 an intermediate stretchable region that stretches in the width direction,
The base end of the side panel is attached to a portion overlapping the waist elastic sheet,
The tape type disposable diaper of any one aspect of the 1st-4th.

(Function and effect)
Like this aspect, the continuity of the expansion-contraction area | region over right and left side panels can be improved by attaching the base end part of the side panel to the part which overlaps a waist elastic sheet.

  As described above, according to the present invention, it is possible to achieve both the stretchability of the side panel and the softness of the touch, and the side panel has a high degree of freedom in dimension and shape.

It is a top view of a tape type disposable diaper showing the inner surface only of a main part deployment state (a side panel is a natural length state). It is a top view of the tape type disposable diaper which shows the outer surface, only a main part is developed (a side panel is in a natural length state). 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 waist elastic sheet, (b) Cross section of waist elastic sheet, (c) Plan view of side panel, (d) Cross section of side panel. FIG. 9 is a sectional view taken along line 9-9 in FIG. 1. It is a top view of the tape type disposable diaper which shows the outer surface, only a main part is developed (a side panel is in a natural length state). FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. 1 in another form. FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. 1 in another form.

  Hereinafter, an embodiment 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 side portion extending forward from the front-rear direction center C and a back side portion extending rearward from the front-rear direction center C. The side panel 13 which protrudes from the both sides of this and which connects the abdominal part F and the back part B is provided. In the illustrated example, the waist portions of the ventral portion F and the dorsal portion B have wing portions WP that extend to the left and right sides (located to the side of the crotch side edges), and the ventral portion F The back portion B has an intermediate portion CP located between the left and right wing portions WP (in other words, the middle of the front-rear direction LD is constricted so that the side edges are around the legs). Both the ventral part F and the dorsal part B have a wing part WP, or the dorsal part B has a wing part WP, but the ventral part F has no wing part WP. You can also.

(Main unit)
The intermediate part CP, the part excluding a part on the tip side in the wing part WP of the back part B, and the wing part WP of the abdomen part F are liquid permeable covering the absorbent body 56 and the front side of the absorbent body 56. The main body 10 includes the top sheet 30 and the liquid-impermeable sheet 11 that covers the back side of the absorber 56. 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.

  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 for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton are used as material fibers. 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 leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-repellent resin or hydrophobic resin or water repellent. 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. The packaging sheet 58 can be omitted as necessary, for example, when the absorbent body 56 is excellent in shape maintenance, and in that case, the absorbent element 50 is composed of the absorbent body 56 alone. 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 diameter of the superabsorbent polymer particles is not particularly limited, but for example, screening using a standard sieve of 500 μm (JIS Z8801-1: 2006) (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 rate is too slow, a phenomenon that the liquid supplied into the absorber 56 returns to the outside of the absorber 56 (so-called reverse return) is likely to occur.

  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 absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(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, between the sheet layers in the middle of the side flap portion SF in the front and rear direction LD, A side elastic member 70 extending in the front-rear direction LD is provided, and a portion having the side elastic member 70 (that is, a side flap portion SF described later in the illustrated example) expands and contracts in the front-rear direction LD due to the expansion and contraction of the side elastic member 70. It is like that.

(Get up gather)
In order to block urine and soft stool that move in the lateral direction on the top sheet 30 and prevent side leakage, on the both sides of the surface of the disposable diaper in the width direction WD, the side of the top sheet 30 rises to the skin side (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. As a result, so-called side leakage from around the legs is prevented.

(Waist elastic sheet)
It is preferable that a belt-like waist stretchable sheet 90 is provided around the trunk portion of the main body 10 in the back side portion B, and the back side 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 an intermediate 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 an interval 72d of 3 to 10 mm.

  Although the width of the waist elastic sheet 90 can be determined as appropriate, it is preferably a width extending between the left and right side flap portions SF as shown in the illustrated example, and particularly a width extending between the left and right wing portions WP. It is preferable. As specific dimensions, the width of the waist elastic sheet 90 is preferably about 80 to 95% of the total width 10X of the main body 10.

  Although the dimensions of the intermediate stretchable region 95 and the non-stretchable region 96 in the waist stretchable sheet 90 can be appropriately determined, the width of the intermediate stretchable region 95 is 45 to 90% of the width between the connecting portions 13A of the left and right side panels 13 described later. The width of the non-stretchable region 96 is preferably about 5 to 50 mm in order to prevent shrinkage and 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. However, as described in Patent Document 3, the elastic member 92 is attached over the intermediate stretchable region 95 and the non-stretchable region 96, and in the non-stretchable region 96, the elastic member 92 is attached. 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 disposed between the liquid-impermeable sheet 11 and the absorbent element 50 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 exterior sheet 12 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.

  As shown in FIG. 8, it is preferable that a waist stretchable sheet 90 that expands and contracts in the width direction WD is provided also on the ventral portion F, because the fit with respect to the waistline is further improved.

(Side panel)
The side panel 13 protrudes from both sides of the back portion B, and is detachably connected to the base end portion 13B attached to the main body 10 of the back portion B and the outer surface of the ventral portion F. 13A to be connected, and a side expansion / contraction region 13E extending and contracting in the width direction WD provided at least in a portion between the base end portion 13B and the connection portion 13A.

  As the connecting portion 13A of the side panel 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 wearing the diaper, turn the wing portion WP of the back portion B from the both sides of the waist to the outer surface of the abdominal portion F, and place the connecting portion 13A of the wing portion WP of the back portion B at the appropriate position on the outer surface of the ventral portion F. Link.

  The side panel 13 is a side 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 side stretchable region 13E is not particularly limited, but is preferably about 150 to 250%. The structure of the side stretchable region 13E is not particularly limited. For example, at least the side stretchable region 13E of the side panel 13 may be formed using a sheet having elasticity by itself such as a rubber sheet or a stretchable nonwoven fabric. it can. 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. At least the side stretchable region 13E of the side panel 13 is formed by using an elastic member 13G that is fixed in a state of being stretched along the width direction WD, such as an elastic shape, a net shape, an elongated shape (thread shape or string shape). 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 side panel 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 side stretchable region 13E is provided over the entire width direction WD of the side panel 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 80 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 regions that do not have the elastic member 13G, but the elastic member 13G is attached over the entire width direction WD of the side panel 13, and the base end portion 13B and the connecting portion 13A are elastic. By cutting the member 13G or the like, a structure in which the elastic member 13G remains in the base end portion 13B and the connecting portion 13A, but hardly or not expands or contracts may be employed.

The connecting portion 13A can be provided on the sheet 13S constituting the side stretchable region 13E, but a support piece 13C protruding from the tip of the side stretchable region 13E is attached to the tip of the side panel 13 as shown in the example, and this support is provided. It is preferable to provide the connecting portion 13A on the piece 13C because manufacturing is easy. It is desirable that the support piece 13C has a connecting portion 13A in the middle of the width direction WD, and the tip portion is a knob that does not have the connecting portion 13A. The shape of the support piece 13C can be determined as appropriate. In the illustrated example, the length of the front-rear direction LD is shortened toward the tip, and the connecting portion 13A is provided at the portion where the length of the front-rear direction LD is shortened. However, it may be rectangular. When the support piece 13C has a rectangular shape, the length in the front-rear direction LD is preferably shorter than the sheet 13S that forms the side stretchable region 13E. As a material of the support piece 13C, a known material such as a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper, or a composite material thereof can be used without particular limitation, but the fineness is 1.0 to 3.5 dtex, and the basis weight is 20 to 100 g / m. ^2. Spunbond nonwoven fabric, air-through nonwoven fabric, or spunlace nonwoven fabric having a thickness of 1 mm or less is preferred.

  The side panel 13 is attached to the main body 10 so that the base end of the side stretchable region 13E is located within the range A1 of ± 20 mm in the width direction WD from the side edge of the intermediate stretchable region 95, more preferably within the range A1 of ± 10 mm. Preferably it is attached. Thereby, the continuity of the expansion-contraction area | region over the left and right side panels 13 can be improved.

  The base end portion 13 </ b> B of the side panel 13 may be connected to a position overlapping the intermediate stretchable region 95 or may be disposed adjacent to the side edge of the intermediate stretchable region 95. The joining between the base end portion 13B of the side panel 13 and the main body 10 is preferably formed to be elongated along the front-rear direction LD as shown 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. It is preferable that the width of the base end part 13B (joint part with respect to the main body 10) of the side panel 13 is 0.5-5 mm or less.

  The shape of the side panel 13 can be determined as appropriate, and it is preferable that the side stretchable region 13E is rectangular as shown in the illustrated example because manufacturing is easy, but the length of the front-rear direction LD increases as the side stretchable region 13E moves toward the tip side. The trapezoid can be shortened. Although the dimension of the side panel 13 can be determined as appropriate, the length of the side stretchable region 13E in the front-rear direction LD is preferably about 40 to 120 mm, and the length of the side stretchable region 13E in the width direction WD is 15 to 100 mm. It is preferable that it is a grade. In particular, when the cover portion 80 described later is provided, the front-and-rear direction LD dimension of the side panel 13 may be shorter than that when the cover portion 80 is not provided. 30% to 60% of the value (if it is constant).

  Although the shrinkage stress of the side panel 13 can be determined as appropriate, the shrinkage stress when the side panel 13 is stretched from the natural length state to the unfolded state is compared with the portion having the waist stretchable sheet 90 and the side panel 13 at the same stretch rate. It is preferable that the portion having 90 has a contraction stress larger than that of the side panel 13. Thereby, since the side panel 13 expands and contracts with a light force, it is excellent in followability to a large change in the waist circumference direction in which the stomach is swollen or deflated. At this time, the waist elastic sheet 90 does not expand or contract unless it has a stronger force, so it does not expand or contract much when the side panel 13 expands or contracts, but expands and contracts when a large force such as twisting the body works to fit the back portion B well. To be. Such an effect is particularly prominent when the size of the static friction coefficient between a cover portion 80, which will be described later, and the outer surface of the ventral portion F is large.

(Target sheet)
It is preferable to provide a target sheet 12T having a target for facilitating connection at the connection portion of the side panel 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 side panel 13 in the ventral portion F is made of a nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a nonwoven fabric, and the connection portion 13A of the side panel 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.

(Cover part)
Both side portions of the back portion B have cover portions 80 projecting inward in the thickness direction of the side panel 13 (only the cover portion on the left side in FIG. 1 is hatched to clearly indicate the cover portion 80). And preferred. The cover portion 80 covers the entire front-rear direction LD of at least a region from the base end of the side panel 13 to the middle in the width direction WD of the side stretchable region 13E with the side stretchable region 13E having a natural length. . And this cover part 80 is a part which is not joined to the side panel 13 at least except the said base end part, and can move and expand / contract freely with respect to the side panel 13. In the illustrated example, since the cover portion is formed by a part of the main body 10, the base end portion 13 </ b> B of the side panel 13 is joined to the cover portion 80, and other portions are not joined to the side panel 13. . By having such a cover portion 80, most of the inner surface of the side panel 13 is covered with the cover portion 80, so that it is not necessary to ensure the flexibility of the touch in the stretchable region of the side panel 13. Even if a shrinkable wrinkle is formed, such as the side panel 13, the cover portion 80 can cover the contact of the shrinkage wrinkle with the skin. Further, since the edges around the legs are formed by the cover portion 80, it is not necessary to secure the dimension in the front-rear direction LD of the stretchable region of the side panel 13 more than necessary. When the edges around the legs are curved, it is only necessary to cut the lower edge of the cover portion 80 in a curved shape along the legs as shown in the example, which is lower than cutting the lower edges of the side panels 13. Cost is enough. That is, by having such a cover portion 80, both the stretchability and softness of the side panel 13 can be achieved, and the degree of freedom of the size and shape of the side panel 13 is increased.

  Although the dimension of the width direction WD of the cover part 80 can be determined as appropriate, the side panel extends over 50% or more, more preferably 70% or more of the width direction WD of the side stretchable region 13E with the side stretchable region 13E in a natural length state. It is preferable that the entire thirteen front-back direction LDs are covered with the cover portion 80. The front end of the cover portion 80 may extend laterally to a position covering the connecting portion 13A of the side panel 13 with the side stretchable region 13E having a natural length. You may be located in the base end side from the part 13A.

  Although the front-rear direction LD dimension of the cover portion 80 may be constant, the lower edge of the cover portion 80 is the edge around the leg, so that it is curved along the circumference of the leg or for other purposes. In addition, it is a preferable mode that the front-rear direction LD dimension of the cover portion 80 decreases continuously (in the illustrated example) or stepwise as it goes sideways.

  In the tape-type disposable diaper having the side panel 13, the main body 10 may not have the wing portion WP. However, in that case, it is necessary to attach a dedicated member to the main body 10 in order to provide the cover portion 80. On the other hand, as shown in the drawing, the wing portion WP is formed by a sheet (the gather sheet 62 and the exterior sheet 12 in the drawing example) constituting the intermediate portion CP of the main body 10, and the cover portion 80 is formed by the wing portion WP. It is preferable to form at least the side portion because it is not necessary to separately attach a member dedicated to the cover portion 80.

  The material of the cover portion 80 is not particularly limited, but a non-woven fabric is preferable in consideration of touch and the like. In the illustrated example, since the gather sheet 62 forms the inner surface of the cover portion 80 and the exterior sheet 12 forms the outer surface of the cover portion 80, the cover portion 80 having excellent touch and strength can be obtained by using non-woven fabric as these materials. Can be formed. In particular, the coefficient of static friction between the outer surface of the ventral part F (the exterior sheet 12 in the illustrated example) and the surface of the cover part 80 (the gather sheet 62 in the illustrated example) is the difference between the outer surface of the ventral part F and the surface of the side panel 13. If the coefficient of static friction is larger than that, the cover portion 80 of the back portion B is less likely to be displaced with respect to the outer surface of the abdominal portion F when worn, and the covering around the trunk is easily maintained. The side panel 13 is easily expanded and contracted with respect to the change in the size of the waist circumference that swells or deflates.

  In the tape-type disposable diaper, in a product state, it is common to fold a portion having the connecting portion 13A toward the center side in the width direction WD and temporarily fix the connecting portion 13A. In the tape-type disposable diaper having the side panel 13, when the connection portion 13 </ b> A is temporarily fixed, the connection portion 13 </ b> A can be temporarily fixed to the side panel 13. However, the side stretchable region 13E of the side panel 13 includes an elastic member and a sheet layer that covers both the front and back surfaces of the elastic member. In the case of the side panel 13 in which the shrinkage folds are formed and the sheet layer is stretched together with the elastic member in the extended state so that the shrinkage folds are extended, the connecting portion 13A is temporarily fixed to the surface having the shrinkage folds. Therefore, the temporary fixing tends to be insufficient. On the other hand, when the cover portion 80 is provided, as shown in FIGS. 11 and 12, a portion on the front end side with respect to the intermediate position between the front end of the cover portion 80 and the connecting portion 13 </ b> A is placed on the cover portion 80. The connecting portion 13A can be temporarily fixed to the cover portion 80 by folding. Thereby, since the cover part 80 does not have shrinkage wrinkles, temporary fixing is difficult to be insufficient.

  Moreover, when the sheet | seat layer which coat | covers both the front and back of the elastic member of the side panel 13 is a nonwoven fabric of tensile strength 15-30N / 50mm, tensile elongation 40-90%, thickness 0.100-0.245mm, side panel 13 However, if the connecting portion 13A is temporarily fixed to the side panel 13, the connecting portion 13A is temporarily fixed to a weak sheet layer. When the connecting portion 13A is temporarily removed during use, the sheet layer is removed. There is a problem of fluffing. On the other hand, while providing the cover part 80, the surface of the cover part 80 is made into a spunbond nonwoven fabric having a tensile strength of 20 to 35 N / 50 mm, a tensile elongation of 10 to 50%, and a thickness of 0.115 to 0.260 mm. As shown in FIG. 12 and FIG. 12, when a portion on the front end side with respect to the intermediate position between the tip of the cover portion 80 and the connecting portion 13A is folded back on the cover portion 80 and the connecting portion 13A is temporarily fixed to the cover portion 80, Fluffing is less likely to occur when the temporary fixing is removed.

  The folding position of the side panel 13 may be the proximal end side of the connecting portion 13A in the support piece 13C as shown in FIG. 9, or the side stretchable region 13E as shown in FIG.

<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.
The thickness can be measured using a KES measuring device (for example, model “KES-G5” manufactured by Kato Tech Co., Ltd.). The pressure drop rate is 0.002 cm / s, the maximum load is 0.098 N ² / cm ^2, and the thickness at the maximum load is read.
・ "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 obtain 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 was measured, 10 0 times to calculate the weight per square meter, a 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.

  B: Dorsal side part, C: Center in the front-rear direction, CP: Intermediate part, EF: End flap part, F ... Abdomen side part, LD ... Front-back direction, SF ... Side flap part, WD ... Width direction, WP ... Wing part, DESCRIPTION OF SYMBOLS 10 ... Main body, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Side panel, 13A ... Connection part, 13B ... Base end part, 13C ... Supporting piece, 13E ... Side stretchable region, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gather gather, 62 ... Gather sheet, 63 ... Gather elastic member, 70 ... Side elastic member, 80 ... Cover part , 90 ... waist elastic sheet, 95 ... intermediate elastic area, 96 ... non-elastic area.