JP6942502B2 - Tape type disposable diapers - Google Patents

Description

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

There are three main types of disposable diapers: tape type, pants type, and pad type. Of these, the tape-type disposable diaper is worn by applying it to the body in the unfolded state and then connecting the connecting portions provided on the left and right sides of the dorsal portion to the outer surface of the ventral portion.

A general tape-type disposable diaper has a ventral portion extending anteriorly from the center in the anterior-posterior direction and a dorsal portion extending posteriorly from the center in the anterior-posterior 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 a connecting part to be connected. Usually, the middle portion is formed by a main body having an absorber, a liquid permeable top sheet covering the front side of the absorber, and a liquid permeable sheet covering the back side of the absorber, and a wing of the back side portion. The entire portion or a portion on the distal end side is formed by a fastener assembly having a connecting portion. At the time of use, the wing portion of the dorsal portion is turned from both sides of the waist to the outer surface of the ventral portion, and the connecting portion of the wing portion of the dorsal portion is connected to the outer surface of the ventral portion. Such tape-type disposable diapers are widely used for nursing care (adult use) as well as for infants.

Tape-type disposable diapers are inferior in fit around the waist compared to pants-type disposable diapers. For this reason, the body around the waist of the dorsal portion is provided with a stretchable region in the width direction (intermediate stretchable region), and the fastener assembly is provided with a stretchable region in the width direction (side stretchable region) to fit around the waistline. It has been proposed to enhance the properties (see, for example, Patent Documents 1 to 3).

For example, in the case described in Patent Document 1, a waist elastic sheet that expands and contracts in the width direction is built in the main body around the waist of the dorsal side portion, and the waist elastic sheet adds elasticity in the width direction to the intermediate portion. Has been done.

Further, in the case described in Patent Document 2, a waist elastic sheet that expands and contracts in the width direction is built in the main body around the waist of the dorsal portion, and the waist elastic sheet extends from the intermediate portion to the base end side of the wing portion. Elasticity in the width direction is added.

The one described in Patent Document 3 has a main body forming an intermediate portion and a side panel (fastener assembly) protruding from the side edge of the main body, and a connecting portion is provided at the tip end portion of the side panel. Is. In the one described in Patent Document 3, a waist elastic sheet that expands and contracts in the width direction is built in the main body, and the side panel expands and contracts in the width direction. The property is added, and the elasticity of the wing part is added by the side panel. This form is preferable because it can impart elasticity in a wider range.

However, as described in detail in Patent Document 1, a plurality of laminated sheet layers and a waist elastic sheet having elasticity in the width direction are incorporated in the main body around the waist of the dorsal portion in the width direction. When forming an elastic region, if the waist elastic sheet has elasticity up to both ends in the width direction, wrinkles and curls may occur at both ends in the width direction of the waist elastic sheet during manufacturing, and the appearance in the product state may be deteriorated. ..

For this reason, conventionally, it is not possible to provide an elastic region over the entire width direction of the waist elastic sheet, and even if the elastic region is provided on the side panel, the elastic regions of the two are not a little separated in the width direction, and the left and right sides are separated from each other. It was difficult to form a continuous stretch region across the panel.

Japanese Unexamined Patent Publication No. 2008-29749 Japanese Unexamined Patent Publication No. 2005-152168 Japanese Unexamined Patent Publication No. 2010-22550

Therefore, a main object of the present invention is to improve the continuity of the expansion / contraction region over the left and right side panels.

A typical aspect of the present invention that solves the above problems is as follows.
<First aspect>
It has a ventral portion extending anteriorly from the center in the anterior-posterior direction and a dorsal portion extending posteriorly from the center in the anterior-posterior direction.
The side panels attached to both sides of the waist circumference of the dorsal part, and
It has a waist elastic sheet provided in a region located at least between the side panels in the dorsal portion.
The side panel is a portion between a base end portion attached to the dorsal side portion, a connecting portion detachably connected to the outer surface of the ventral side portion, and at least the base end portion and the connecting portion. It has a side expansion and contraction area that expands and contracts in the width direction provided in
The waist stretchable sheet has non-stretchable regions at both ends in the width direction, and the portion between these non-stretchable regions is an intermediate stretchable region that stretches in the width direction.
For tape-type disposable diapers
The base end of the side telescopic region of the side panel is located within a range of ± 20 mm in the width direction from the side edge of the intermediate telescopic region.
A tape-type disposable diaper that features this.

(Action effect)
In this embodiment, since the base end of the side expansion / contraction region of the side panel is located within a range of ± 20 mm in the width direction from the side edge of the intermediate expansion / contraction region, the continuity of the expansion / contraction region over the left and right side panels is improved. be able to.

<Second aspect>
At least the waist circumference of the dorsal portion has wing portions extending to both the left and right sides.
The intermediate telescopic region extends over the left and right wing portions.
The tape-type disposable diaper of the first aspect.

(Action effect)
In the form having a side panel, by intentionally providing a wing portion as in this embodiment and expanding the width of the intermediate expansion / contraction region, the length of the side expansion / contraction region can be shortened by that amount, and the cost can be reduced. Can be done.

<Third aspect>
A waist elastic sheet that expands and contracts in the width direction is also provided on the ventral side portion.
The tape-type disposable diaper of the first or second aspect.

(Action effect)
By providing a waist elastic sheet on the ventral side, the fit to the waistline is further improved.

As described above, according to the present invention, there are advantages such as improved continuity of the expansion / contraction region over the left and right side panels.

It is a top view which shows the inner surface of a tape type disposable diaper, and only the main body is in the unfolded state (the side panel is a natural length state). It is a top view which shows the outer surface of a tape type disposable diaper, and only the main body is in the unfolded state (the side panel is a natural length state). FIG. 5 is a cross-sectional view taken along the line 5-5 of FIG. 6-6 is a cross-sectional view taken along the line 6-6 of FIG. (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. It is (a) plan view of the waist telescopic sheet, (b) the cross-sectional view of the waist telescopic sheet, (c) the plan view of the side panel, (d) the cross-sectional view of the side panel. 9-9 is a cross-sectional view taken along the line 9-9 of FIG. It is a top view which shows the outer surface of a tape type disposable diaper, and only the main body is in the unfolded state (the side panel is a natural length state). 9-9 is a cross-sectional view taken along the line 9-9 of FIG. 1 in another form. 9-9 is a cross-sectional view taken along the 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. The dotted pattern portion in the cross-sectional view shows a hot melt adhesive that joins each component, but instead of the hot melt adhesive, another adhesive may be used, or welding such as heat sealing or ultrasonic sealing may be used. Needless to say, they may be joined by using. Further, in the following description, the "front-back direction LD (vertical direction)" means a direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction WD" means a direction orthogonal to the front-back direction. It means (horizontal direction).

1 to 7 show an example of a tape-type disposable diaper. This tape-type disposable diaper has a ventral portion extending anteriorly from the center C in the anterior-posterior direction and a dorsal portion extending posteriorly from the center C in the anterior-posterior direction. A side panel 13 for connecting the ventral side portion F and the dorsal side portion B, which protrudes from both side portions of the above. In the illustrated example, the waist circumference of the ventral portion F and the dorsal portion B has a wing portion WP extending to both left and right sides (located laterally from the side edge on the crotch side), and the ventral portion F. And the dorsal part B has an intermediate part CP located between the left and right wing parts WP (in other words, the middle of the anteroposterior LD is constricted so that the side edge is along the leg circumference). , Both the ventral portion F and the dorsal portion B have no wing portion WP, or the dorsal portion B has a wing portion WP but the ventral portion F does not have a wing portion WP. You can also do it.

(Main body)
The intermediate portion CP, the portion of the wing portion WP of the dorsal portion B excluding the tip side part, and the wing portion WP of the ventral portion F are the absorber 56 and the liquid permeable portion that covers the front side of the absorber 56. It is formed by a main body 10 having a top sheet 30 and a liquid-impermeable sheet 11 that covers the back side of the absorber 56. The main body 10 includes an end flap portion EF that extends to the front and rear sides of the absorber 56 and does not have the absorber 56, and a side flap portion SF that extends laterally from the absorber 56 and does not have the absorber 56. 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 thereof with an adhesive such as a hot melt adhesive, and further, this liquid. An absorbing element 50 including an absorber 56, an intermediate sheet 40, and a 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 absorption element 50, and have side edges of the absorption element 50 in the top sheet 30. The peripheral portion protruding from the side edge of the absorbing element 50 in the liquid impermeable sheet 11 is fixed to the peripheral edge portion protruding from the side edge 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 width direction WD on the surface of the main body 10, rising gathers 60, 60 that stand up on the skin side of the wearer are provided, and the gather sheets 62, 62 forming the rising gathers 60, 60 are tops. It extends from both side portions of the seat 30 to each side flap portion SF.

Hereinafter, the materials and characteristic parts of each part will be described in order.
(Exterior sheet)
The exterior sheet 12 is provided so that the back surface of the disposable diaper has a cloth-like feel and appearance. Nonwoven fabric is suitable as the exterior sheet 12, but the exterior sheet 12 is not limited to this. The type of non-woven fabric is not particularly limited, and as the material fiber, for example, olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton are used. As the 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, long-fiber non-woven fabrics such as spunbonded non-woven fabrics, SMS non-woven fabrics, and SMMS non-woven fabrics are suitable from the viewpoint of achieving both touch and strength. The non-woven fabric can be used alone or in layers. In the latter case, it is preferable to bond the non-woven fabrics 12 to each other with a hot melt adhesive or the like. When a non-woven fabric is used, the fiber basis weight is preferably 10 to 50 g / m ² , especially 15 to 30 g / m ² . The exterior sheet 12 can be omitted, in which case the liquid-impermeable sheet 11 can be exposed on the back surface of the disposable diaper.

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but is substantially, for example, an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a non-woven fabric is laminated on a polyethylene sheet or the like, or a waterproof film. Examples thereof include a non-woven fabric that ensures liquid impermeableness (in this case, the waterproof film and the non-woven fabric form a liquid-impermeable sheet). Of course, in addition to this, a material having liquid impermeableness and moisture permeability, which has been favorably used from the viewpoint of preventing stuffiness in recent years, 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, the sheet is molded, and then stretched in the uniaxial or biaxial direction. The microporous sheet obtained in the above can be exemplified. Furthermore, it is waterproofed by a non-woven fabric using microdenyl fibers, strengthening of leakage resistance by reducing the voids of the fibers by applying heat or pressure, and coating with a highly water-absorbent 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 the liquid-impermeable sheet 11 is not limited to this, and the liquid-impermeable sheet 11 is the exterior sheet 12. It can be changed as appropriate, such as having the same width.

(Top sheet)
As the top sheet 30, a liquid-permeable material such as a perforated or non-perforated non-woven fabric or a porous plastic sheet can be used. The raw material fiber of the non-woven fabric is not particularly limited. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based fibers, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. Further, the non-woven fabric may be produced 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, if flexibility and drapeability are required, the span lace method is preferable, and if bulkiness and softness are required, the thermal bond method is preferable.

The top sheet 30 may be made of one sheet or may be made of 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 plane direction.

The top sheet 30 of the illustrated example extends laterally from the side edge of the absorber 56, but is not limited to this, and may extend to the side edge of the exterior sheet 12, and in a form having rising gathers. As long as it extends to the base of the rising gathers, it may be appropriately changed such that it may extend only to the inside 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 absorbing element 50 in order to move the excrement that has passed through the top sheet 30 to the absorber and prevent reversion. The intermediate sheet 40 not only rapidly transfers excrement to the absorber to enhance the absorption performance by the absorber, but also prevents the absorbed excrement from returning from the absorber and makes the surface of the top sheet 30 feel soft. It is something to improve. The intermediate sheet 40 may 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, and when heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 40 is preferably one having a melting point similar to that of the top sheet 30. Further, considering that the solid content in the stool is permeated, 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 residue of the top sheet 30 is unlikely to be generated, but the solid content of the stool is difficult to permeate. Therefore, the fibers of the non-woven fabric used for the intermediate sheet 40 preferably have a fineness of about 2.0 to 5.0 dtex. The intermediate sheet 40 can also be a mesh film or the like in which a large number of pores are provided in a film material such as polyethylene.

The intermediate sheet 40 of the illustrated form is arranged in 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 total length of the diaper, may be the same as the length of the absorbing element 50, or may be within a short length range centered on the area for receiving the liquid.

(Absorption element)
The absorbing element 50 is a portion that absorbs and holds a liquid such as urine or loose stool, and has an absorber 56 and a packaging sheet 58 that encloses the entire absorber 56 in the illustrated example. The packaging sheet 58 may be omitted if necessary, such as when the absorber 56 is excellent in shape retention. In that case, the absorbent 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 thereof.

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. The fiber aggregate is obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and by opening the tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary. 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 done. In the case of synthetic fibers, the fineness 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 crimping of the crimped fibers can be, for example, 5 to 75 fibers per 2.54 cm , preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. Further, in many cases, uniformly crimped crimped fibers are used. It is preferable to disperse and hold the highly absorbent polymer particles in the absorber 56.

In addition to having a rectangular shape as shown in the illustrated example, it is preferable that the absorber 56 has an hourglass shape having a constricted portion narrower than both front and rear sides in the middle in the front-rear direction because the fit around the legs is improved.

Further, the size of the absorber 56 can be appropriately determined as long as it extends to the front, back, left and right of the urination port position, but it is preferable that the size of the absorber 56 extends to the vicinity of the peripheral edge of the main body 10 in the front-back direction LD and the width direction WD. Reference numeral 56X indicates the total width of the absorber 56, reference numeral 10X indicates the total width of the main body 10, and reference numeral 10L indicates the total length of the main body 10 (equal to the total length of the diaper in the illustrated form).

(Highly absorbent polymer particles)
The absorber 56 may contain highly absorbent polymer particles in part or all of it. The highly absorbent polymer particles include "powder" in addition to "particles". As the highly absorbent polymer particles 54, those used for this kind of absorbent article can be used as they are. The particle size of the highly absorbent polymer particles is not particularly limited, but for example, sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 500 μm, and particles falling under the sieve by this sieving. 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 top is 60% by weight or more.

The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbent polymer particles include starch-based, cellulosic-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl cellulose. A substance or an acrylic acid (salt) polymer or the like can be used. As the shape of the highly absorbent polymer particles, a powder or granular material that is usually used is preferable, but other shapes can also be used.

As the highly absorbent 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 (so-called reversion) in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer ^{is less than 50 g / m 2} , it becomes difficult to secure the absorption amount. Above 350 g / m ² , the effect saturates.

(Packaging sheet)
When the packaging sheet 58 is used, as the material thereof, tissue paper, particularly crepe paper, non-woven fabric, polylami non-woven fabric, sheet having small holes and the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMS non-woven fabric (SMS, SMSMS, etc.) is particularly preferable, and polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material. The basis weight is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

The packaging form of the packaging sheet 58 can be appropriately determined, but from the viewpoint of ease of manufacture and prevention of leakage of highly absorbent polymer particles from the front and rear edge edges, a cylinder is provided so as to surround the front and back surfaces and both side surfaces of the absorber 56. It is preferable that the components are wound in a shape, the front and rear edges thereof are projected from the front and rear of the absorber 56, and the overlapping portions and the overlapping portions 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 peripheral portion located in the middle of the front-rear direction LD of the side portion of the main body 10, the side flap portion SF is placed between the sheet layers in the middle of the front-rear direction LD. A side elastic member 70 extending in the front-rear direction LD is provided, and the portion having the side elastic member 70 (that is, the 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 has become like.

(Get up gather)
In order to block urine and loose stools moving laterally on the top sheet 30 and prevent lateral leakage, both sides of the widthwise WD of the surface of the disposable diaper stand up from the side of the top sheet 30 to the skin side (protrusion). The rising gather 60 is provided over the entire front-rear direction.

In the raised gather 60 of the illustrated example, the root portion 65 fixed to the region including the side flap portion SF, the protruding portion 66 extending from the root portion 65, and both ends of the protruding portion in the front-rear direction are fixed in an inverted state. Gather elasticity fixed in a state of being extended in the front-rear direction to at least the tip portion of the raised portion 67 and the non-fixed rising portion 68 located between the front and rear lodging portions of the protruding portion 66. It has a member 63. The rising gather 60 is formed by a gather sheet 62 folded at the tip, a water-repellent non-woven fabric can be used as the gather sheet 62, and an elongated elastic member such as rubber thread 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 each may be provided. The elongation rate of the portion having the gathered elastic member 63 is not particularly limited, but is usually preferably 150 to 350%, more preferably 200 to 300%.

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

In the protruding portion 66 of the rising gather 60, although both ends of the LD in the front-rear direction are inverted portions, the portion between them is a non-fixed rising portion 68, and this rising portion 68 is a contraction of the gather elastic member 63. You will be able to stand up by force. When the diaper is attached, the diaper is attached to the body in a boat shape, and the contraction force of the gather elastic member 63 acts on the body. Therefore, the contraction force of the gather elastic member 63 causes the gather 60 to stand up and elastically adhere to the legs. As a result, so-called lateral leakage from around the legs is prevented.

(Waist elastic sheet)
It is preferable that a band-shaped waist elastic sheet 90 is provided around the waist of the main body 10 in the dorsal portion B so that the dorsal portion B elastically expands and contracts in the width direction WD. In the waist elastic sheet 90, both ends of the width direction WD are non-expandable regions 96, and the portion between these non-expandable regions 96 is an intermediate elastic region 95 that expands and contracts in the width direction WD. be. The waist elastic sheet 90 may be located only on the end flap portion EF, but if it 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 It is preferable because the rear end is firmly pressed against the body.

As the waist elastic sheet 90, a sheet-like elastic member such as a rubber sheet may be used, but it is preferable to use a non-woven fabric from the viewpoint of breathability. In this case, a sheet-like elastic member having breathability such as a stretchable non-woven fabric can be used, but as shown in FIG. 6, two sheet layers 91 such as a non-woven fabric are attached with an adhesive such as a hot melt adhesive. A sheet-like, net-like, elongated (thread-like, string-like, etc.) elastic member 92 with holes between the two sheet layers 91 is preferably fixed in a state of being extended along the width direction WD. .. As the material of the sheet layer 91 in this case, 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%. When an elongated elastic member 92 (thread-like or string-like) is used, it is preferable to provide about 5 to 15 elastic members with a thickness of 420 to 1120 dtex at intervals of 72 d of 3 to 10 mm.

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

The dimensions of the intermediate stretchable region 95 and the non-stretchable region 96 of the waist stretchable sheet 90 can be appropriately determined, but 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 curling when attached to the main body 10. The non-stretchable region 96 may be a region having no elastic member 92, but 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 the elastic member 92 is attached to the non-stretchable region 96. The elastic member 92 may remain in the non-stretchable region 96, but the structure may be such that the elastic member 92 hardly expands or contracts at all.

Further, a part of the elastic member 92 may be arranged so as to cross the absorber 56, but as shown in FIG. 6, a part or the whole of the portion where the elastic member 92 overlaps with the absorber 56 is cut. As a result, if the structure is such that the elastic member 92 remains but hardly expands or contracts at all, the rear end portion of the absorber 56 does not shrink in the width direction, so that the fit is further improved.

In the illustrated form, the waist elastic sheet 90 is arranged between the liquid permeable sheet 11 and the absorbing element 50, but the arrangement is not particularly limited. For example, the waist elastic sheet 90 may be arranged between the liquid-impermeable sheet 11 and the exterior sheet 12, or may be provided outside the exterior sheet 12. Further, 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 the ventral portion F is also provided with the waist elastic sheet 90 that expands and contracts in the width direction WD because the fit to the waist circumference is further improved.

(Side panel)
The side panels 13 project from both side portions of the dorsal side portion B, and are detachably connected to the base end portion 13B attached to the main body 10 of the dorsal side portion B and the outer surface of the ventral side portion F. It has a connecting portion 13A to be formed and a side stretching region 13E that expands and contracts in the width direction WD provided at least in a portion between the base end portion 13B and the connecting portion 13A.

As the connecting portion 13A of the side panel 13, a hook material (male material) for a mechanical fastener (hook-and-loop 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 shapes of the engaging protrusions are (A) -shaped, (B) J-shaped, (C) mushroom-shaped, and (D). There are T-shapes, (E) double J-shapes (shapes in which J-shapes are joined back to back), and the like, but any shape may be used. When wearing the diaper, turn the wing portion WP of the dorsal portion B from both sides of the waist to the outer surface of the ventral portion F, and place the connecting portion 13A of the wing portion WP of the dorsal portion B at an appropriate position on the outer surface of the ventral portion F. Link.

The side panel 13 has a side expansion / contraction region 13E in which at least a portion between the base end portion 13B and the connecting portion 13A expands / contracts in the width direction WD. The elongation rate of the side expansion / contraction region 13E is not particularly limited, but is preferably about 150 to 250%. The structure of the side elastic region 13E is not particularly limited, and at least the side elastic region 13E of the side panel 13 may be formed by using a sheet having elasticity by itself such as a rubber sheet or an elastic non-woven fabric. can. Further, as illustrated in FIGS. 6 (c) and 6 (d), two sheet layers 13S such as a non-woven fabric are bonded together with an adhesive such as a hot melt adhesive, and a perforated sheet is formed between the two sheet layers 13S. It is also possible to form at least the side expansion / contraction region 13E of the side panel 13 by using an elastic member 13G having a shape, a net shape, an elongated shape (thread shape, a string shape, etc.) fixed in a stretched state along the width direction WD. Suitable. In this way, a plurality of elongated elastic members 13G attached to the sheet layer 13S at intervals are not only easy to manufacture because they are widely used in the technical field of disposable diapers, but also the elongated elastic members 13G. There is also an advantage that the shrinkage characteristics of the side panel 13 can be easily adjusted by making the thickness, the number of diapers, the elongation rate, the spacing, and the type of material different. As the material of the sheet layer 13S in this case, the same material as the exterior sheet 12 can be used. Further, when an elongated elastic member 13G (thread-like or string-like) is used, for example, about 5 to 15 elastic 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 expansion / contraction region 13E is provided over the entire widthwise 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 or the connecting portion 13A contracts, the connection of the connecting portion 13A may be insufficient or a poor joining of the base end portion 13B may occur. It is preferably 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 a region having no 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, the elastic member 13G may remain in the base end portion 13B and the connecting portion 13A, but may have a structure in which the elastic member 13G hardly expands or contracts at all.

The connecting portion 13A can be provided on the seat 13S constituting the side expansion / contraction region 13E, but as shown in the illustrated example, a support piece 13C protruding from the tip of the side expansion / contraction region 13E is attached to the tip end portion of the side panel 13 to support the side panel 13. It is preferable to provide the connecting portion 13A on the piece 13C because it is easy to manufacture. It is desirable that the support piece 13C has a connecting portion 13A in the middle of the WD in the width direction, and the tip portion is a knob portion having no connecting portion 13A. The shape of the support piece 13C can be appropriately determined, and in the illustrated example, the length of the front-rear LD becomes shorter toward the tip, and the connecting portion 13A is provided at the portion where the length of the front-rear LD becomes shorter. However, it can also be rectangular. When the support piece 13C has a rectangular shape, it is preferable that the LD length in the front-rear direction is shorter than that of the sheet 13S constituting the side expansion / contraction region 13E. As the material of the support piece 13C, known materials such as non-woven fabric, plastic film, polylami non-woven fabric, paper and composite materials thereof can be used without particular limitation, but the fineness is 1.0 to 3.5 dtex and the grain size is 20 to 100 g / m. ^2. A spunbonded non-woven fabric, an air-through non-woven fabric, or a spunlaced non-woven fabric having a thickness of 1 mm or less is preferable.

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

The base end portion 13B of the side panel 13 may be connected at a position overlapping the intermediate expansion / contraction region 95, or may be arranged adjacent to the side edge of the intermediate expansion / contraction region 95. The joint between the base end portion 13B of the side panel 13 and the main body 10 is preferably formed in an elongated shape along the front-rear direction LD as shown in the illustrated example, and is preferably strong. It is preferably made by welding such as a seal, but it may be made by a hot melt adhesive. The width of the base end portion 13B (joint portion with respect to the main body 10) of the side panel 13 is preferably 0.5 to 5 mm or less.

The shape of the side panel 13 can be appropriately determined, and it is preferable that the side expansion / contraction region 13E is rectangular as shown in the illustrated example because it is easy to manufacture. It can also be a trapezoid that shortens. The dimensions of the side panel 13 can be appropriately determined, but the length of the front-rear LD of the side expansion / contraction region 13E is preferably about 40 to 120 mm, and the length of the width direction WD of the side expansion / contraction region 13E is 15 to 100 mm. It is preferably about. In particular, when the cover portion 80 described later is provided, the front-rear LD dimension of the side panel 13 may be shorter than that when the cover portion 80 is not provided. Therefore, for example, the minimum value of the front-rear LD dimension of the cover portion 80. It can be 30 to 60% of (the value if it is constant).

The contraction stress of the side panel 13 can be appropriately determined, but the contraction stress when extending from the natural length state to the unfolded state is the waist expansion / contraction sheet at the same elongation rate when comparing the portion having the waist expansion / contraction sheet 90 and the side panel 13. It is preferable that the portion having 90 has a larger contraction stress than the side panel 13. As a result, the side panel 13 expands and contracts with a light force, so that it has excellent followability to a large change in the waist circumference direction such as swelling or deflation of the abdomen. At this time, since the waist elastic sheet 90 does not expand or contract unless it has a stronger force, it does not expand or contract so much when the side panel 13 expands or contracts, but it expands and contracts when a large force such as twisting the body acts, and the back side portion B fits well. Will be. Such an effect becomes particularly remarkable when there is a magnitude relationship of the coefficient of static friction between the cover portion 80 and the outer surface of the ventral portion F, which will be described later.

(Target sheet)
It is preferable to provide a target sheet 12T having a target for facilitating the connection at the connection portion of the side panel 13 in the ventral portion F. When the connecting portion 13A is a hook material, the target sheet 12T may have a large number of loop threads provided on the surface of a sheet base material made of a plastic film or a non-woven fabric so that the engaging protrusions of the hook material are entangled. Further, in the case of the pressure-sensitive adhesive layer, one in which the surface of a sheet base material made of a plastic film having a smooth surface, which is highly adhesive, is subjected to a peeling treatment can be used. Further, when the connecting portion of the side panel 13 in the ventral side portion F is made of a non-woven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a non-woven fabric and the connecting portion 13A of the side panel 13 is made of a hook material, It is also possible to omit the target sheet 12T and entangle the hook material with the non-woven fabric of the exterior sheet 12 to connect them. 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 dorsal side portion B each have a cover portion 80 (only the cover portion on the left side of FIG. 1 is shaded to clearly indicate the cover portion 80) protruding inward in the thickness direction of the side panel 13. Is preferable. The cover portion 80 covers the entire front-rear direction LD of at least the region from the base end of the side panel 13 to the middle of the width direction WD of the side expansion / contraction region 13E in a state where the side expansion / contraction region 13E has a natural length. .. The cover portion 80 is a portion in which at least a portion other than the base end portion is not joined to the side panel 13 and can be freely moved and expanded / contracted 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 13B of the side panel 13 is joined to the cover portion 80, and the other parts 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 secure the flexibility of touch in the stretchable region of the side panel 13, for example, which will be described later. Even if a side panel 13 having shrinkage wrinkles is formed, the cover portion 80 can cover the contact of the shrinkage wrinkles with the skin. Further, since the edge around the leg is formed by the cover portion 80, it is not necessary to secure the dimension of the LD in the front-rear direction of the expansion / contraction region of the side panel 13 more than necessary. When the edge around the leg is curved, it is only necessary to cut the lower edge of the cover portion 80 in a curved shape along the leg circumference as shown in the illustrated example, which is lower than cutting the lower edge of the side panel 13. It costs money. That is, by having such a cover portion 80, both the elasticity of the side panel 13 and the flexibility of touch can be achieved, and the degree of freedom in the dimensions and shape of the side panel 13 is high.

The size of the width direction WD of the cover portion 80 can be appropriately determined, but when the side expansion / contraction region 13E has a natural length, the side panel covers 50% or more, more preferably 70% or more of the width direction WD of the side expansion / contraction region 13E. It is preferable that the entire front-rear direction LD of 13 is covered by the cover portion 80. The tip of the cover portion 80 may extend laterally to a position where the side expansion / contraction region 13E has a natural length and covers the connecting portion 13A of the side panel 13, or the side panel 13 may be connected as shown in the illustrated example. It may be located on the proximal end side of the portion 13A.

The front-back LD dimension of the cover portion 80 may be constant, but the lower edge of the cover portion 80 is the edge around the leg, so that this may be curved along the leg circumference, or for other purposes. In addition, it is a preferable form that the LD dimension in the front-rear direction of the cover portion 80 decreases continuously (illustrated example) or gradually as the cover portion 80 moves toward the side.

In a tape-type disposable diaper having a side panel 13, the main body 10 does not have to have a 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 illustrated example, the wing portion WP is intentionally formed by the sheets (the gather sheet 62 and the exterior sheet 12 in the illustrated 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 a side portion of the cover portion 80 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 the touch and the like. In the illustrated example, 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. Therefore, by using a non-woven fabric as these materials, the cover portion 80 having excellent touch and strength is used. Can be formed. In particular, the coefficient of static friction between the outer surface of the ventral portion F (exterior sheet 12 in the illustrated example) and the surface of the cover portion 80 (gather sheet 62 in the illustrated example) is the coefficient of static friction between the outer surface of the ventral portion F and the surface of the side panel 13. If it is larger than the coefficient of static friction, the cover portion 80 of the dorsal portion B is less likely to shift with respect to the outer surface of the ventral portion F when worn, and the coating around the torso is easily maintained, but the abdomen is hungry. The side panel 13 easily expands and contracts in response to changes in the waist circumference such as swelling and shrinking.

In a tape-type disposable diaper, in the product state, it is common to fold the portion having the connecting portion 13A toward the center side of the width direction WD and temporarily fix the connecting portion 13A. In a tape-type disposable diaper having a side panel 13, when such a connecting portion 13A is temporarily fixed, the connecting portion 13A can also be temporarily fixed to the side panel 13. However, the side expansion / contraction region 13E of the side panel 13 has an elastic member and a sheet layer covering both the front and back surfaces of the elastic member, and in the natural length state, the sheet layer shrinks together with the elastic member and both the front and back surfaces of the sheet layer. In the case of the side panel 13 in which shrinkage wrinkles are formed and the sheet layer is stretched together with the elastic member in the stretched state to stretch the shrinkage wrinkles, the connecting portion 13A is temporarily fixed to the surface having the shrinkage wrinkles. Therefore, 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 closer to the tip side than the intermediate position between the tip end of the cover portion 80 and the connecting portion 13A is placed on the cover portion 80. It can be folded back and the connecting portion 13A can be temporarily fixed to the cover portion 80. As a result, since the cover portion 80 has no shrinkage wrinkles, temporary fixing is less likely to be insufficient.

When the sheet layer covering both the front and back surfaces of the elastic member of the side panel 13 is a non-woven 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 side panel 13 However, if the connecting portion 13A is temporarily fixed to the side panel 13, the connecting portion 13A will be temporarily fixed to the weak sheet layer, and if the temporary fixing of the connecting portion 13A is removed during use, the sheet layer will be released. There is a problem of fluffing. On the other hand, the cover portion 80 is provided, and the surface of the cover portion 80 is made of a spunbonded non-woven 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 11 and FIG. 12, when the portion on the tip side of 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 when the temporary fixing is removed is less likely to occur.

The folded position of the side panel 13 may be the base end side of the connecting portion 13A of the support piece 13C as shown in FIG. 9 or the side expansion / contraction 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.
-"Unfolded state" means a state in which the natural length is completely flattened and unfolded without contraction or slack.
-"Elongation rate" means a value when the natural length is 100%.
-"Gel strength" is measured as follows. To 49.0 g of artificial urine, 1.0 g of a highly absorbent polymer is added and stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, 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" includes 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. It is a mixture of .09 wt% and is used at a temperature of 37 ° C. 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 descent speed of the pressure plate is 0.002 cm / s, the maximum load value is 0.098 N / cm ^2, and the thickness at the maximum load is read.
・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to constant weight of a sample or test piece in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. From the test piece in a constant amount, a sample having a size of 100 mm × 100 mm is cut out using a sampling template (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 "Water absorption test method for highly water-absorbent resin".
-"Water absorption rate" is the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for highly water-absorbent resin" was performed using 2 g of highly 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 (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). do.
-Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

The present invention can be used for tape-type disposable diapers as in the above example.

B ... dorsal part, C ... center in the front-back direction, CP ... middle part, EF ... end flap part, F ... ventral part, LD ... front-back direction, SF ... side flap part, WD ... width direction, WP ... wing part, 10 ... Main body, 11 ... Liquid permeable sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Side panel, 13A ... Connecting part, 13B ... Base end part, 13C ... Support piece, 13E ... Side expansion and contraction area, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Rise gather, 62 ... Gather sheet, 63 ... Gather elastic member, 70 ... Side elastic member, 80 ... Cover part , 90 ... Waist elastic sheet, 95 ... Intermediate elastic region, 96 ... Non-expandable region.

Claims (3)

It has a ventral portion extending anteriorly from the center in the anterior-posterior direction and a dorsal portion extending posteriorly from the center in the anterior-posterior direction.
The side panels attached to both sides of the waist circumference of the dorsal part, and
It has a waist elastic sheet provided in a region located at least between the side panels in the dorsal portion.
The side panel is a portion between a base end portion attached to the dorsal side portion, a connecting portion detachably connected to the outer surface of the ventral side portion, and at least the base end portion and the connecting portion. It has a side expansion and contraction area that expands and contracts in the width direction provided in
The waist stretchable sheet has non-stretchable regions at both ends in the width direction, and the portion between these non-stretchable regions is an intermediate stretchable region that stretches in the width direction.
For tape-type disposable diapers
The base end of the side expansion / contraction region of the side panel is located within a range of ± 20 mm in the width direction from the side edge of the intermediate expansion / contraction region.
Both side portions of the dorsal side portion each have a cover portion protruding inward in the thickness direction of the side panel.
The cover portion covers the entire region in the front-rear direction from the base end of the side panel to the middle of the width direction of the side expansion / contraction region in a state where the side expansion / contraction region has a natural length.
At least a portion of the side panel other than the base end portion is not joined to the cover portion.
The cover portion is protruded on both sides of the longitudinal direction of the side panels,
The coefficient of static friction between the outer surface of the ventral portion and the inner surface of the cover portion is larger than the coefficient of static friction between the outer surface of the ventral portion and the inner surface of the side panel.
A tape-type disposable diaper that features this. At least the waist circumference of the dorsal portion has wing portions extending to both 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 in which the sheet constituting the intermediate portion extends laterally.
At least a side portion of the cover portion is formed by the wing portion,
The tape-type disposable diaper according to claim 1. In the side expansion / contraction region and the intermediate expansion / contraction region, the contraction stress of the intermediate expansion / contraction region is larger than that of the side expansion / contraction region at the same expansion ratio.
The tape-type disposable diaper according to claim 1 or 2.

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