JP6633729B2 - Tape type disposable diapers - Google Patents

Description

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

  There are mainly three types of disposable diapers: a tape type, a pants type, and a pad type. Of these, a tape-type disposable diaper is attached to a body in a deployed state, and then attached by connecting a fastening tape protruding from both sides of a back portion to an outer surface of a ventral portion.

  A general tape-type disposable diaper has a body having a ventral portion extending forward from the center in the front-rear direction, and a back portion extending rearward from the center in the front-rear direction, and from both sides of the back portion. Each has a protruding fastening tape, and when attached to the body, has a structure in which the fastening tape is turned from both sides of the waist to the outer surface of the abdominal portion and connected to the outer surface of the abdominal portion. Such a tape-type disposable diaper is widely used for nursing care (adult use) in addition to being used for infants.

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

  In particular, it is preferable to provide an elastic region in the width direction at the waist circumference of the back part and to provide an elastic region in the fastening tape in the width direction, since elasticity can be imparted to a wider range.

  However, as described in detail in Patent Document 3, when a waist elastic sheet having elasticity in the width direction is built in the waist around the back part to form an elastic region in the width direction, the waist elastic sheet is used. If it has elasticity to both ends in the width direction, wrinkles and curling may occur at both ends in the width direction of the waist elastic sheet at the time of production, and the appearance in a product state may be deteriorated.

  For this reason, conventionally, it was not possible to provide an elastic region over the entire width direction of the waist elastic sheet, and it was not possible to provide sufficient elasticity around the waist with only the waist elastic sheet. Further, even if the elastic tape is provided with an elastic area, it is difficult to form a continuous elastic area extending over the left and right fastening tapes, since both elastic areas are separated from each other in the width direction.

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

  Therefore, a main object of the present invention is to provide a wide elastic range of the waist elastic sheet in order to enhance the fit around the waist.

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

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

<Second aspect>
The fastening tape has a tape stretchable area that expands and contracts in the width direction provided at a portion between the base end and the connecting part,
The fastening tape is attached to the main body such that a base end of the tape elastic area is located within a range of ± 5 mm in a width direction from a side edge of the main body elastic area,
The tape-type disposable diaper according to the first aspect.

(Effects)
In this aspect, since the portion having the non-stretchable region in the main body is folded back toward the center and fixed, the width of the non-stretchable region of the waist stretchable sheet occupying the width of the main body (inevitably formed) is reduced. be able to. As a result, it is possible to improve the continuity of the expansion / contraction region over the left and right fastening tapes.

<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 a region including the side flap portion, a gather sheet forming a protruding portion extending from the root portion, and a falling portion in which both front and rear ends of the protruding portion are fixed in a falling state, A non-fixed rising portion located between the front and rear falling portions of the protruding portion, and a rising gather having a gather elastic member fixed in a state of extending in the front-rear direction at least at the end of the rising portion,
With
In the waist elastic sheet, the main body elastic region extends over left and right side flap portions,
The side flap portion is a portion where the gather sheet, the liquid impermeable sheet, the waist elastic sheet, and the exterior sheet are stacked,
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 stretch sheet, and a portion where the exterior sheet is folded to the front side,
A base end portion of the fastening tape is attached to a back surface of a portion having the folded portion in the side flap portion.
The tape-type disposable diaper according to the second aspect.

(Effects)
In the case where a portion having the waist elastic sheet and the fastening tape as in this embodiment is provided, the folded portion may have a structure as in this embodiment. In this case, since 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, the strength of the portion where the force is concentrated during use (the attaching portion of the fastening tape) is high. In addition to this, there is an advantage that no force for peeling off the folded portion is applied. Alternatively, since the base end of the fastening tape is not attached to the skin side, the feel 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 a region including the side flap portion, a gather sheet forming a protruding portion extending from the root portion, and a falling portion in which both front and rear ends of the protruding portion are fixed in a falling state, A non-fixed rising portion located between the front and rear falling portions of the protruding portion, and a rising gather having a gather elastic member fixed in a front-to-rear direction at least at a distal end portion of the rising portion,
With
In the waist elastic sheet, the main body elastic region extends over left and right side flap portions,
The side flap portion is a portion where the gather sheet, the liquid impermeable sheet, the waist elastic sheet, and the exterior sheet are stacked,
The folded portion is formed in the side flap portion, at least a part of the non-stretchable region of the waist stretch sheet, and a portion where the exterior sheet is folded to the front side,
The front side of the folded portion is covered with a side portion of the gather sheet,
A base end of the fastening tape is attached between the folded portion in the side flap portion and a side portion of the gather sheet,
The tape-type disposable diaper according to the second aspect.

(Effects)
In the case where a portion having the waist elastic sheet and the fastening tape as in this embodiment is provided, the folded portion may have a structure as in this embodiment. 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 (the attachment portion of the fastening tape) is high. Alternatively, the base end of the fastening tape is not exposed, and the front side of the folded portion is covered with the side of the gather sheet, so that a hard material such as an exterior sheet is not exposed, so that 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 a region including the side flap portion, a gather sheet forming a protruding portion extending from the root portion, and a falling portion in which both front and rear ends of the protruding portion are fixed in a falling state, A non-fixed rising portion located between the front and rear falling portions of the protruding portion, and a rising gather having a gather elastic member fixed in a state of extending in the front-rear direction at least at the end of the rising portion,
With
In the waist elastic sheet, the main body elastic region extends over left and right side flap portions,
The side flap portion is a portion where the gather sheet, the liquid impermeable sheet, the waist elastic sheet, and the exterior sheet are stacked,
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 stretch sheet, and the portion where the exterior sheet is folded back,
A base end portion of the fastening tape is attached to a back surface of a portion having the folded portion in the side flap portion.
The tape-type disposable diaper according to the second aspect.

(Effects)
In the case where a portion having the waist elastic sheet and the fastening tape as in this embodiment is provided, the folded portion may have a structure as in this embodiment. 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 (the attachment portion of the fastening tape) is high. In addition, since the front side of the folded portion is formed of a gather sheet and the base end of the fastening tape is not attached to the skin side, the feel of the skin side surface is not impaired.

<Sixth aspect>
The folded portion does not include the liquid impermeable sheet,
The tape-type disposable diaper according to any one of the third to fifth aspects.

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

  As described above, according to the present invention, it is possible to obtain a wide range of expansion and contraction of the waist elastic sheet, thereby improving the fit around the torso.

It is a top view in the state where a diaper was developed showing an inner surface of a tape type disposable diaper. FIG. 2 is a plan view showing the outer surface of the tape-type disposable diaper in a state where the diaper is developed. FIG. 5 is a sectional view taken along line 5-5 of FIG. 1. FIG. 6 is a sectional view taken along line 6-6 of FIG. 1. (A) is a sectional view taken along line 7-7 of FIG. 1, and (b) is a sectional view taken along line 8-8 of FIG. (A) A plan view of a waist elastic sheet, (b) a cross-sectional view of a waist elastic sheet, (c) a plan view of a fastening tape, and (d) a cross-sectional view 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 fastening tape in other forms. It is sectional drawing which expands and shows the part which has a waist elastic sheet and fastening tape in other forms.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The dot pattern in the cross-sectional view indicates a hot-melt adhesive for joining the constituent members. Instead of the hot-melt adhesive, another adhesive may be used, or a heat seal, an ultrasonic seal, or another welding method may be used. It is needless to say that the bonding may be performed by using or. In the following description, “the front-back direction LD (vertical direction)” means a direction connecting the abdomen (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 to 7 show an example of a tape-type disposable diaper. This tape-type disposable diaper has a ventral portion F extending forward from the front-rear center C and a back portion B extending rearward from the front-rear center C. An absorber 56 provided at an intermediate portion in the width direction WD over the side portion B, a liquid-permeable top sheet 30 covering the front side of the absorber 56, and a liquid impermeable sheet 11 covering the back side of the absorber 56; And a fastening tape 13 projecting from both sides of the waist portion of the back portion B of the body 10 and connecting the abdominal portion F and the back portion B. The main body 10 includes an end flap portion EF having no absorber 56 extending forward and rearward of the absorber 56, and a side flap portion SF having no absorber 56 extending laterally of the absorber 56. Have.

(Body)
In the main body 10, the width of the waist portion of the abdominal portion F and the back portion B is wider than the width of the crotch portion like a general tape-type disposable diaper (in other words, the constricted portion along the leg circumference is removed). Although the form may be provided in the middle of the front-back direction LD, the width of the diaper is the same as the width of the crotch portion over the entire length as shown in the example in order to eliminate the need for cutting (in other words, a constricted portion is provided). It is also a preferred form to adopt a (rectangular not) form.

  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 of the main body 10 by an adhesive such as a hot melt adhesive. On the inner surface side of the impermeable sheet 11, an absorbing element 50 including an absorber 56, an intermediate sheet 40, and a top sheet 30 are laminated in this order. The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction LD and the width direction WD than the absorbing element 50, and have side edges of the absorbing element 50 in the top sheet 30. The protruding peripheral portion and the protruding peripheral portion of the liquid impermeable sheet 11 protruding from the side edge of the absorbing element 50 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.

  Further, on both sides of the surface of the main body 10 in the width direction WD, rising gathers 60, 60 that stand on the skin side of the wearer are provided, and gather sheets 62, 62 that form the rising gathers 60, 60 are placed on the top. The seat 30 extends from both side portions to each side flap portion SF.

Hereinafter, the materials and characteristic portions of each part will be described in order.
(Exterior sheet)
The exterior sheet 12 is provided to make the back surface of the disposable diaper feel and look like a cloth. Although a nonwoven fabric is suitable as the exterior sheet 12, it is not limited to this. The type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, in addition to synthetic fibers such as olefin-based such as polyethylene or polypropylene, polyester-based, and polyamide-based, regenerated fibers such as rayon and 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 spunbonded nonwoven fabric, an SMS nonwoven fabric, and an SMMS nonwoven fabric is preferable from the viewpoint that both touch and strength can be achieved. The nonwoven fabric may be used alone or in a plural number. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like. When a non-woven fabric is used, the basis weight of the fiber is preferably 10 to 50 g / m ² , particularly preferably 15 to 30 g / m ² . The exterior sheet 12 may be omitted, and in this case, the liquid impermeable sheet 11 may be exposed on the back surface of the disposable diaper.

(Liquid impermeable sheet)
Although the material of the liquid impermeable sheet 11 is not particularly limited, for example, an olefin-based resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a waterproof film is substantially interposed therebetween. A liquid-impermeable sheet (in this case, a liquid-impermeable sheet is composed of a waterproof film and a nonwoven fabric). Of course, in addition to this, a liquid-impermeable and moisture-permeable material which has been used in recent years from the viewpoint of preventing stuffiness can be exemplified. As a sheet of a material having this liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and after forming the sheet, it is stretched in a uniaxial or biaxial direction. Can be exemplified. In addition, non-woven fabric using micro denier fiber, waterproofing is enhanced by methods such as strengthening leakproofness by applying heat or pressure to reduce fiber voids, coating high water-absorbing resin or hydrophobic resin or water repellent. A liquid-impermeable sheet without using a film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 of the illustrated example is slightly wider than the top sheet 30 and narrower than the exterior sheet 12, but is not limited thereto. The width can be changed as appropriate, such as the same width.

(Top sheet)
As the top sheet 30, a liquid-permeable one such as a perforated or non-porous nonwoven fabric or a porous plastic sheet can be used. The material of the nonwoven fabric is not particularly limited. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these. And the like. Further, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods, for example, a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, a point bond method, and the like. For example, a spun lace method is preferred for flexibility and drapability, and a thermal bonding method is a preferred processing method for bulkiness and softness.

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by laminating 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 laterally beyond the side edge of the absorber 56, the present invention is not limited to this. The top sheet 30 may extend to the side edge of the exterior sheet 12, and the top sheet 30 may have a raised gather. As long as it extends to the base of the rising gather, it can be changed as appropriate, for example, it may be extended only to the widthwise inner side of the side edge of the absorber.

(Intermediate sheet)
An intermediate sheet (also called a second sheet) 40 can be provided between the top sheet 30 and the absorbing element 50 in order to move the excrement that has passed through the top sheet 30 to the absorber and prevent the excrement from returning. This intermediate sheet 40 not only improves the absorption performance of the absorbent by rapidly transferring excrement to the absorber, but also prevents the excrement absorbed from returning from the absorber, and reduces the touch of the surface of the top sheet 30. It's something to improve. 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 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. Also, in consideration of permeation of solids in feces, the fineness of the fiber used for the intermediate sheet 40 is preferably 5.0 to 7.0 dtex, but the liquid residue on 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 remaining on the top sheet 30 is hardly generated, but the stool solids are hardly permeated. 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 number of pores are provided in a film material such as polyethylene.

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

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

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. Examples of the fiber aggregate include a filament aggregate obtained by spreading a tow (fiber bundle) of synthetic fibers such as cellulose acetate, as necessary, in addition to fibers obtained by stacking short fibers such as cotton-like pulp and synthetic fibers. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately Can be. The fineness of the synthetic fiber is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 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 fiber can be, for example, about 5 to 75 pieces, preferably about 10 to 50 pieces, more preferably about 15 to 50 pieces per 2.54 cm. In addition, crimped fibers that are uniformly crimped are often used. It is preferable that superabsorbent polymer particles are dispersed and held in the absorber 56.

  In addition to the rectangular shape as shown in the illustrated example, the absorber 56 is preferably formed in an hourglass shape having a narrow portion at the middle in the front-rear direction and narrower than the front and rear sides, since the fit around the legs is improved, which is preferable.

  The size of the absorber 56 can be appropriately determined as long as it extends in the front-rear and left-right directions of the urination port position. Reference numeral 56X indicates the entire width of the absorber 56, reference numeral 10X indicates the entire width of the main body 10, and reference numeral 10L indicates the entire length of the main body 10 (equal to the total length of the diaper in the illustrated embodiment).

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or the whole thereof. The 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. When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the percentage of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve is used. It is desirable that the ratio of the particles remaining on the top 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 preferred. Examples of the superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based particles, such as starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile copolymer saponified product, and sodium carboxymethylcellulose crosslinking. Or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles is preferably in the form of a commonly used powder, 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 suitably used. If the water absorption speed is too slow, the so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 easily occurs.

  As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even when the bulky absorber 56 is used, the sticky feeling after absorbing the liquid can be effectively suppressed.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the 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 . When the basis weight of the polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. If it exceeds 350 g / m ² , the effect is saturated.

(Packaging sheet)
When the packaging sheet 58 is used, as the material thereof, tissue paper, in particular, crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet having small holes, or the like can be used. However, a sheet from which the superabsorbent polymer particles do not escape is desirable. When a nonwoven fabric is used instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material thereof can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly preferably 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate. However, from the viewpoint of ease of manufacture and prevention of leakage of the highly absorbent polymer particles from the front and rear edges, a tube 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 edges protrude from the front and rear of the absorber 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by 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 a leg-surrounding portion located at the middle of the side portion of the main body 10 in the front-rear direction LD, a sheet layer (FIG. In the illustrated example, a side elastic member 70 extending in the front-rear direction LD is provided between the exterior sheet 12 and the liquid impermeable sheet 11 of the folded portion 80 described later and between the gather sheet 62 and the liquid impermeable sheet 11). Due to the expansion and contraction of the side elastic member 70, 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-back direction LD.

(Get up gather)
In order to block urine and loose stool moving laterally on the top sheet 30 and prevent lateral leakage, both sides of the surface of the disposable diaper in the width direction WD rise from the side of the top sheet 30 to the skin side (projection). The rising gathers 60 are provided over the entire front-back 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 fixed in a laid state. The raised portion 67, a non-fixed rising portion 68 located between the front and rear falling portions of the projecting portion 66, and a gather elasticity fixed to at least the distal end portion of the rising portion 68 in a state of being extended in the front-rear direction. And a member 63. The rising gather 60 is formed by a gather sheet 62 folded at the tip. A water-repellent nonwoven fabric can be used as the gather sheet 62, and an elongated elastic member such as thread rubber is used as the gather elastic member 63. be able to. As shown in FIGS. 1 and 2, a plurality of gather elastic members 63 may be provided at intervals, or one gather elastic member may be provided. The elongation percentage of the portion having the gather elastic members 63 is not particularly limited, but is usually preferably 150 to 350%, and more preferably 200 to 300%.

  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 To the side of the region overlapping with the absorber 56.

  The protruding portion 66 of the rising gather 60 has both ends in the front-rear direction LD lying down, but a portion between them is a non-fixed rising portion 68, and the rising portion 68 is contracted by the gather elastic member 63. Stands up by force. When the diaper is worn, the diaper is mounted on the body in a boat shape, and the contraction force of the gather elastic member 63 acts, so that the gather 60 rises due to the contraction force of the gather elastic member 63 and rises up and elastically adheres around the leg. As a result, so-called lateral leakage from around the legs is prevented.

(Waist elastic sheet)
A band-shaped waist elastic sheet 90 extending between the left and right side flap portions SF is provided between the two fastening tapes 13, and the back portion B elastically expands and contracts in the width direction WD. The waist elastic sheet 90 has both ends in the width direction WD serving as non-stretchable regions 96, and a portion between the non-stretchable regions 96 serves as a main body stretchable region 95 that expands and contracts in the width direction WD. is there. The waist elastic sheet 90 may be located only at the end flap portion EF. However, if the waist elastic sheet 90 is arranged so as to extend from the end flap portion EF to the rear end portion of the absorber 56 as shown in the illustrated example, the absorber 56 This is preferable because the rear end of the body 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, two sheet layers 91 such as a nonwoven fabric are attached 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 (a string or a string) is fixed between the two sheet layers 91 while 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. It is preferable that the elongation rate of the elastic member 92 is about 150 to 250%. In the case where an elongated member (such as a string or a string) is used as the elastic member 92, it is preferable to provide approximately 5 to 15 rods having a thickness of 420 to 1120 dtex at an interval of 3 to 10 mm in the front-rear direction.

  The dimensions of the main body stretchable region 95 and the non-stretchable region 96 in the waist stretchable sheet 90 can be appropriately determined, but 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. It is preferable that the width of the non-stretchable region 96 is about 5 to 40 mm in order to prevent shrinkage and turning-up at the time of attachment to the main body 10. The non-stretchable region 96 may be a region not having the elastic member 92. However, 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 elastic member 92 is fixed in the non-stretchable region 96. The elastic member 92 may remain in the non-stretchable region 96 by cutting or the like, but the structure may be such that the elastic member 92 hardly expands or contracts at all.

  Further, the elastic member 92 can be arranged so that a part thereof crosses the absorber 56. However, as shown in FIG. 6, the elastic member 92 cuts a part or all of a portion overlapping the absorber 56. Accordingly, if the elastic member 92 remains but hardly or not at all expands and contracts, the rear end portion of the absorber 56 does not shrink in the width direction, so that the fitting property is further improved.

  In the illustrated embodiment, the waist elastic sheet 90 is arranged between the liquid impermeable sheet 11 and the exterior sheet 12, but is not particularly limited to this arrangement. For example, the waist elastic sheet 90 may be disposed between the liquid impermeable sheet 11 and the absorbing 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 projects from both sides of the waist portion of the back portion B, and the base portion 13B attached to the waist portion of the back portion B and the outer surface of the abdominal portion F. And a connecting portion 13A which is detachably connected to the main body. In addition, in order to improve the fit around the waist, in the illustrated example, at least a portion between the base end portion 13B and the connecting portion 13A is provided with a tape elastic region 13E that expands and contracts in the width direction WD. A known fastening tape having no tape expansion / contraction region can be used.

  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 member has a large number of engaging projections on its connection surface. The shape of the engaging projection is (A) L-shaped, (B) J-shaped, (C) mushroom-shaped, (D) There are a T-shape, (E) a double J-shape (a shape in which J-shapes are joined back to back) and the like, 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 in a state where the side flap portion SF of the back portion B is overlapped with the outside of the side flap portion SF of the abdominal portion F. I do.

  The fastening tape 13 can be provided with a tape stretchable region 13E in which at least a portion between the base end 13B and the connecting portion 13A expands and contracts in the width direction WD. The elongation rate 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 itself such as a rubber sheet or a stretchable nonwoven fabric. . As illustrated in FIGS. 6C and 6D, two sheet layers 13 </ b> S such as a nonwoven fabric are bonded together with an adhesive such as a hot melt adhesive, and a perforated sheet is provided between the two sheet layers 13 </ b> S. At least the tape stretchable region 13E of the fastening tape 13 may be formed by using an elastic member 13G having a shape, a net shape, an elongated shape (a string shape, a string shape, or the like) fixed in a state extended along the width direction WD. It is suitable. The one in which a plurality of elongated elastic members 13G are attached to the sheet layer 13S at intervals as described above is not only easy to manufacture because it is widely used in the technical field of disposable diapers, but also the elongated elastic members 13G. The shrinkage characteristics of the fastening tape 13 can be easily adjusted by changing the thickness, the number, the elongation rate, the interval, and the type of the material. In this case, the same material as the exterior sheet 12 can be used as the material of the sheet layer 13S. In the case of using an elongated member (such as a string or a string) as the elastic member 13G, for example, approximately 5 to 15 members having a thickness of 420 to 1120 dtex can be provided at an interval in the front-rear direction of 3 to 10 mm.

  The tape expansion / contraction region 13E is provided over the entire width WD of the fastening tape 13 (that is, including the base portion 13B and the connection portion 13A) as long as it is provided at least in a portion between the base portion 13B and the connection portion 13A. However, if the base end 13B or the connecting portion 13A contracts, the connection of the connecting portion 13A may be insufficient, or a joining failure of the base end 13B may occur. It is preferably provided in a 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 portion 13B and the connecting portion 13A may be a region without 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 portion 13B and the connecting portion 13A have elasticity. By cutting the member 13G or the like, the elastic member 13G may remain at the base end portion 13B and the connecting portion 13A, but may hardly or not expand and contract.

(Target sheet)
It is preferable to provide a target sheet 12T having a target for facilitating the connection at the connecting portion of the fastening tape 13 in the abdominal portion F. When the connecting portion 13A is a hook material, a target sheet 12T having a large number of loop threads provided on the surface of a sheet substrate made of a plastic film or a nonwoven fabric so that the engaging projections of the hook material are entangled can be used. In the case of the pressure-sensitive adhesive layer, a layer obtained by subjecting a surface of a sheet substrate made of a plastic film having a smooth surface to have high adhesion to a release treatment can be used. When the connecting portion of the fastening tape 13 in the abdominal portion F is made of a nonwoven fabric, for example, when the exterior sheet 12 in the illustrated form is made of a nonwoven fabric, and the connecting 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.

(Return 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 elastic sheet 90 is folded toward the center side and fixed. The fastening tape 13 is arranged such that the base end of the tape stretchable region 13E is located within a range A1 of ± 5 mm, more preferably within a range A1 of ± 2 mm, in the width direction WD from a side edge of the body stretchable region 95. Attached to. Thereby, the width of the non-stretchable region 95 of the waist stretchable sheet 90 occupying the width of the main body 10 (inevitably formed) can be reduced. When the fastening tape 13 has the tape stretchable region 13E, the continuity of the stretchable region extending over the left and right fastening tapes 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 expansion / contraction region 95 or may be arranged adjacent to a side edge of the main body expansion / contraction region 95. The joint between the base end portion 13B of the fastening tape 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. It is preferably performed by welding such as a seal, but may be performed by 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 whole of the side flap portion SF in the width direction WD or the center side in the width direction WD than 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 folded position is preferably located at the boundary between the main body stretchable region 95 and the non-stretchable region 96. However, although not shown, even if it is located at the center side of the boundary, as shown in the example shown in FIG. May be located. In a normal case, the turn-back 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 a boundary between the main body stretchable region 95 and the non-stretchable region 96. .

  When the folded portion 80 is formed by simply folding the side portion of the main body 10, the number of material laminations increases and the material becomes harder, and the fastening tape 13 which was conventionally sandwiched between the materials and was not exposed is exposed. There is a point to be taken into consideration, such as the point that the exterior sheet 12, which emphasizes strength over flexibility, is on the skin side. Therefore, as one preferred embodiment, as in the examples shown in FIGS. 4 and 8, the waist elastic sheet 90 has the main body elastic area 95 extending over the left and right side flap portions SF, and the side flap portion SF includes the 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 in the side flap portion SF, and the non-gathered portion of the gather sheet 62 and the waist elastic sheet 90 is formed. A base end portion 13B of the fastening tape 13 is attached to at least a part of the elastic region 96 and a portion where the exterior sheet 12 is folded back to the front side, and to a back surface of a portion having the folded portion 80 in the side flap portion SF. A form is proposed.

  When the folded portion 80 has such a structure, since the base end portion 13B of the fastening tape 13 is attached to the back surface of the portion having the folded portion 80 in the side flap portion SF, force is concentrated during use. This not only increases the strength of the part to be fastened (the part to which the fastening tape 13 is attached), but also provides the advantage that no force for peeling off the folded part 80 is applied. Alternatively, since the base end portion 13B of the fastening tape 13 is not attached to the skin side, the feel of the surface on the skin side is not impaired.

  As shown in FIG. 9, the folded portion 80 is formed in the side flap portion SF, and at least a part of the non-stretchable region 96 of the waist elastic sheet 90 and the portion where the exterior sheet 12 is folded to the front side. 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 provided 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 (the attaching portion of the fastening tape 13 in the folded portion 80). Will be higher. 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, so that a hard material such as the exterior sheet 12 is not exposed, so that the touch is impaired. Nothing.

  Further, as shown in FIG. 10, the folded portion 80 is formed in the side flap portion SF, and the gather sheet 62, at least a part of the non-stretchable area 96 of the waist stretch sheet 90, and the exterior sheet 12 are folded back. It is also a preferable embodiment that the base end portion 13B of the fastening tape 13 is attached to the back surface of the portion having the folded portion 80 in the side flap portion SF. 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 (the attaching portion of the fastening tape 13 in the folded portion 80). Will be higher. Further, since the front side of the folded portion 80 is formed of the gather sheet 62 and the base end portion 13B of the fastening tape 13 is not attached to the skin side, the touch on the skin side surface is not impaired.

  On the other hand, since the folded portion 80 increases in thickness and tends to be 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). Rather, it is preferable that some of the sheets only extend 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 elastic sheet 90 extends only halfway through the folded portion 80, so that the flexibility of the folded portion 80 is not easily impaired.

  Further, from such a viewpoint, it is preferable that the folded portion 80 does not include the liquid impermeable sheet 11 that is particularly hard, as shown in the illustrated example.

  In the above example, the side portion of the main body 10 is folded in the width direction WD over the entire longitudinal direction LD. However, only a part including the waist elastic sheet 90 may be folded to form the folded portion 80.

<Description of terms in the specification>
The following terms in the specification have the following meanings unless otherwise indicated in the specification.
-The "deployed state" refers to a state in which it has been completely flattened and expanded from its natural length state without contraction or loosening.
-"Elongation rate" means the value when the natural length is 100%.
"Gel strength" is measured as follows. 1.0 g of superabsorbent polymer is added to 49.0 g of artificial urine, and the mixture is stirred with a stirrer. The resulting gel is left in a constant temperature / humidity bath at 40 ° C. × 60% RH for 3 hours, then returned to normal temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I. techno Engineering).
-"Artificial urine" is composed of 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%, and used at a temperature of 37 ° C. unless otherwise specified.
・ "Cost" is measured as follows. After pre-drying the sample or test piece, the sample or test piece is left in a test room or apparatus in a standard condition (the test place is at a temperature of 23 ± 1 ° C. and a relative humidity of 50 ± 2%) to make it a constant weight. Predrying refers to making a sample or a test piece a constant weight in an environment at a temperature of 100 ° C. Preliminary drying may not be performed for fibers having an official moisture content of 0.0%. A sample having a size of 100 mm × 100 mm is cut out from the test piece in a constant weight state using a template for sampling (100 mm × 100 mm). The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as the basis weight.
-"Water absorption" is measured by JIS K7223-1996 "Testing method for water absorption of superabsorbent resin".
"Water absorption rate" is "time to end point" when JIS K7224-1996 "Test method for water absorption rate of super water absorbent resin" was performed using 2 g of super absorbent polymer and 50 g of physiological saline. And
-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (the test location is 23 ± 1 ° C and 50 ± 2% relative humidity). I do.
-Unless otherwise stated, the dimensions of each part mean dimensions in the unfolded state, not the natural length state.

  The present invention can be used for a tape-type disposable diaper as described above.

  DESCRIPTION OF SYMBOLS 10 ... Body, 11 ... Liquid impermeable 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 ... Absorptive element, 56 ... Absorber, 58 ... Packing sheet, 60 ... Gathered gather, 62 ... Gather sheet, 63 ... Gather elastic member, 70 ... Side elastic member, B ... Back part, F ... Abdomen Side portion, EF: end flap portion, SF: side flap portion, LD: front-rear direction, WD: width direction, 80: folded portion, 90: waist stretchable sheet, 96: non-stretchable region, 95: body stretchable region.

Claims (6)

A body having a ventral portion extending forward from the center in the front-rear direction, and a back portion extending rearward from the center in the front-rear direction;
Fastening tapes protruding from both sides of the waist portion of the back portion,
Having a waist elastic sheet provided on the waist portion of the back side portion,
The fastening tape has a base end attached to the waist portion of the back portion, and a connecting portion detachably connected to an outer surface of the abdomen portion,
The waist elastic sheet has both ends in the width direction as non-stretchable regions, and a portion between these non-stretchable regions is a main body stretchable region that expands and contracts in the width direction.
In tape type disposable diapers,
The main body has a folded portion that is fixed so that a side portion including the portion having the non-stretchable region is folded back toward the center and does not peel off .
A tape-type disposable diaper characterized by the following. The fastening tape has a tape stretchable area that expands and contracts in the width direction provided at a portion between the base end and the connecting part,
The fastening tape is attached to the main body such that a base end of the tape elastic area is located within a range of ± 5 mm in a width direction from a side edge of the main body elastic area,
The tape-type disposable diaper according to claim 1. 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 a region including the side flap portion, a gather sheet forming a protruding portion extending from the root portion, and a falling portion in which both front and rear ends of the protruding portion are fixed in a falling state, A non-fixed rising portion located between the front and rear falling portions of the protruding portion, and a rising gather having a gather elastic member fixed in a state of extending in the front-rear direction at least at the end of the rising portion,
With
In the waist elastic sheet, the main body elastic region extends over left and right side flap portions,
The side flap portion is a portion where the gather sheet, the liquid impermeable sheet, the waist elastic sheet, and the exterior sheet are stacked,
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 stretch sheet, and a portion where the exterior sheet is folded to the front side,
A base end portion of the fastening tape is attached to a back surface of a portion having the folded portion in the side flap portion.
The tape-type disposable diaper according to claim 2. 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 a region including the side flap portion, a gather sheet forming a protruding portion extending from the root portion, and a falling portion in which both front and rear ends of the protruding portion are fixed in a falling state, A non-fixed rising portion located between the front and rear falling portions of the protruding portion, and a rising gather having a gather elastic member fixed in a state of extending in the front-rear direction at least at the end of the rising portion,
With
In the waist elastic sheet, the main body elastic region extends over left and right side flap portions,
The side flap portion is a portion where the gather sheet, the liquid impermeable sheet, the waist elastic sheet, and the exterior sheet are stacked,
The folded portion is formed in the side flap portion, at least a part of the non-stretchable region of the waist stretch sheet, and a portion where the exterior sheet is folded to the front side,
The front side of the folded portion is covered with a side portion of the gather sheet,
A base end of the fastening tape is attached between the folded portion in the side flap portion and a side portion of the gather sheet,
The tape-type disposable diaper according to claim 2 . 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 a region including the side flap portion, a gather sheet forming a protruding portion extending from the root portion, and a falling portion in which both front and rear ends of the protruding portion are fixed in a falling state, A non-fixed rising portion located between the front and rear falling portions of the protruding portion, and a rising gather having a gather elastic member fixed in a state of extending in the front-rear direction at least at the end of the rising portion,
With
In the waist elastic sheet, the main body elastic region extends over left and right side flap portions,
The side flap portion is a portion where the gather sheet, the liquid impermeable sheet, the waist elastic sheet, and the exterior sheet are stacked,
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 stretch sheet, and the portion where the exterior sheet is folded back,
A base end portion of the fastening tape is attached to a back surface of a portion having the folded portion in the side flap portion.
The tape-type disposable diaper according to claim 2 . The folded portion does not include the liquid impermeable sheet,
The tape-type disposable diaper according to any one of claims 3 to 5 .

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