JP2022054856A - Absorbent article - Google Patents

Abstract

To suppress leaching of excretion liquid at a root part of raising gathers.SOLUTION: An absorbent article includes raising gathers 60 raising from the surface of a top sheet 30 along blocking positions 60B of excretion. The top sheet 30 has end parts outside the blocking positions 60B. Root parts 65 of the raising gathers 60 and a liquid impermeable sheet 11 have extension parts extending outside the top sheet 30 respectively. The extension parts of the root parts 65 and the extension parts of the liquid impermeable sheet 11 are continuously bonded in the direction along the blocking positions 60B without mediating the top sheet 30 to form outside bonding parts 69 and have reservoir gaps 80 where the root parts 65 and the liquid impermeable sheet 11 are not bonded up to the outside bonding parts 69 from outer edges of the top sheet 30, an upper part is covered with a gather non-woven fabric 62 and a lower part is covered with the liquid impermeable sheet 11.SELECTED DRAWING: Figure 8

Description

The present invention relates to an absorbent article that suppresses the exudation of excrement liquid at the root of the rising gather.

Today, most absorbent articles such as disposable diapers and menstrual pads have rising gathers that rise from both sides of the surface in the width direction. By providing the rising gathers, the lateral movement of the excrement rises and is blocked by the gathers, so that so-called lateral leakage is prevented. In addition, some disposable diapers have raised gathers on the waist side of the surface to prevent leakage from the waist.

Most of the rising gathers employ a basic structure in which a non-woven fabric (hereinafter referred to as gathered non-woven fabric) is contracted by an elastic elastic member (hereinafter referred to as a gathered elastic member) to raise the non-woven fabric (see, for example, Patent Documents 1 to 3). More specifically, the rising gathers extend along the blockage position of the excrement in the absorbent article, and the root portion attached to the outside of the blockage position in the absorbent article and the main body protruding from the root portion. A rising portion formed by fixing a portion and both ends of the main body portion in the extending direction of the cutoff position on the surface of the article in an inverted state, and a portion between the inverted portion in the main body portion being non-fixed. Has a part. The main body of the gathered nonwoven fabric has a two-layer structure in which at least the tip is folded back at the tip (protruding tip), and the gather elastic member extends in the direction extending in the blocking position between layers of at least the tip of the raised portion. It is fixed at.

The gathered non-woven fabric is required to have a liquid-shielding property (a liquid-blocking property, which is a property of preventing the liquid content of excrement from penetrating and seeping out). Therefore, as the gathered nonwoven fabric, a nonwoven fabric containing a meltblown layer having a dense structure, for example, an SMS nonwoven fabric (spunbond layer-meltblown layer-spunbond layer) is preferably used. Further, in order to prevent the liquid content of excrement from penetrating into the gathered nonwoven fabric and oozing out, a water repellent agent or a hydrophobic agent is also applied to the gathered nonwoven fabric (see, for example, Patent Document 3).

However, when the state of blocking the excrement fluid by the rising gathers continued to some extent, the excretory fluid sometimes exuded to the surface of the base portion of the rising gathers.

Japanese Unexamined Patent Publication No. 2010-154928 Japanese Unexamined Patent Publication No. 2001-25485 Japanese Unexamined Patent Publication No. 2010-137062 Japanese Unexamined Patent Publication No. 07-184955 Japanese Unexamined Patent Publication No. 2001-293032.

Therefore, the main object of the present invention is to suppress the exudation of the excretory liquid at the root of the rising gather.

The present inventor has obtained the following findings as a result of diligent research on the above-mentioned problems. That is, the root of the rising gather is fixed to the surface of the top sheet, and if the state of blocking the excrement by the rising gather continues, the excrement permeates the top sheet and reaches the back side of the base of the rising gather. I lost a place to escape and was seeping out of the gathered non-woven fabric. The absorbent articles described below are based on such findings.

<First aspect>
Absorber and
A liquid-permeable top sheet placed on the front side of the absorber,
A liquid impermeable sheet placed on the back side of the absorber,
With a rising gather that rises from the surface of the top sheet along the excrement blocking position,
The rising gathers are a root portion attached to a portion outside the cutoff position including the surface of the top sheet, a main body portion protruding from the root portion, and both ends of the main body portion in a direction along the cutoff position. A gathered nonwoven fabric having an inverted portion formed by fixing the raised portion in an inverted state and a raised portion formed by not fixing the portion between the inverted portions in the main body portion, and attached to at least the tip portion of the raised portion. It has a gathered elastic member and is
The top sheet has an end on the outside of the cutoff position.
The root portion and the liquid impermeable sheet each have an extending portion extending outward from the top sheet.
The extending portion of the root portion and the extending portion of the liquid impermeable sheet are continuously joined in a direction along the blocking position without interposing the top sheet to form an outer joining portion.
From the outer edge of the top sheet to the outer joint, the root and the liquid-impermeable sheet are not joined, the upper part is covered with the gathered non-woven fabric, and the lower part is covered with the liquid-impermeable sheet. Have a sunk gap,
An absorbent article characterized by that.

(Action effect)
In this absorbent article, the root of the rising gather is fixed to the surface of the top sheet, and if the rising gather continues to block the excrement, the excrement permeates the top sheet and the root of the rising gather. Reaching the back side is the same as before, but the outer edge of the topsheet is not adjacent to the outer joint, but to the storage gap. Therefore, the excrement liquid that permeates the top sheet and rises up and reaches the back side of the base of the gather can escape to the storage gap instead of immediately losing the escape place, and the gathered non-woven fabric permeates the surface by that amount. It becomes difficult to seep out.

<Second aspect>
The outer joint portion has a side elastic member extending in a direction along the cutoff position.
The portion having the side elastic member contracts in the front-rear direction together with the side elastic member to form wrinkles, and is expandable in the front-rear direction.
The distance between the storage gap and the side elastic member in the width direction is 3 mm or less.
The absorbent article of the first aspect.

(Action effect)
When a side elastic member for forming a plane gather is provided at the outer joint portion as in this embodiment, the side elastic member has a widthwise distance of 3 mm or less between the storage gap and the side elastic member. It is preferable because the contractile force makes it easier for wrinkles to be formed in the members above and below the storage gap, and the storage gap is formed thicker and more reliably.

<Third aspect>
The edge of the top sheet is folded back once or a plurality, and a plurality of layers are laminated.
The absorbent article of the first or second aspect.

(Action effect)
As in this embodiment, it is preferable that the edges of the top sheet are folded back and have a plurality of layers, because the storage gap is thicker and more reliably formed.

<Fourth aspect>
The layers of the folded portion of the top sheet are not joined,
The absorbent article of the third aspect.

(Action effect)
As described above, when the edges of the top sheet are folded back and multiple layers are overlapped, a large gap is likely to be formed between the layers because the layers are not joined as in this embodiment, and the storage gap as a whole is likely to be formed. It is preferable because it becomes thicker and the portion including the end portion of the top sheet does not become hard.

<Fifth aspect>
A recess recessed upward is formed at least intermittently in the front-rear direction on the lower surface of the portion of the gathered nonwoven fabric that covers the upper part of the storage gap.
An absorbent article according to any one of the first to fourth aspects.

(Action effect)
It is preferable to provide the recess of this aspect because the storage gap is larger and more reliably formed.

<Sixth aspect>
A recess recessed downward is formed at least intermittently in the front-rear direction on the upper surface of the portion of the liquid-impermeable sheet that covers the lower part of the storage gap.
An absorbent article according to any one of the first to fifth aspects.

(Action effect)
It is preferable to provide the recess of this aspect because the storage gap is larger and more reliably formed.

<Seventh aspect>
In the range from the outer edge of the top sheet to the outer joint portion, the storage gap and the auxiliary joint portion to which the root portion and the liquid impermeable sheet are joined are repeatedly provided at least alternately in the front-rear direction. Has been
An absorbent article according to any one of the first to sixth aspects.

(Action effect)
If the storage gaps are continuous over a wide area, the surface may be lifted over a wide area, which may deteriorate the appearance and fit. It is also preferable to do so.

According to the present invention, there are advantages such as being able to suppress the exudation of excrement liquid at the root of the rising gather.

It is a top view in the unfolded state which shows the inner surface of the articulation type disposable diaper. It is a top view in the unfolded state which shows the outer surface of the articulation type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along the line 7-7 of FIG. FIG. 8 is a cross-sectional view taken along the line 8-8 of FIG. 9-9 is a cross-sectional view taken along the line 9-9 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. Both (a) and (b) are sectional views showing an enlarged view of a main part of a rising gather. Both (a) and (b) are sectional views showing an enlarged view of a main part of a rising gather. It is a top view in the unfolded state which shows the inner surface of the articulation type disposable diaper.

1 to 7 show a connected disposable diaper (generally also referred to as a tape type disposable diaper) which is an example of an absorbent article, and the reference numeral X in the figure indicates the entire width of the diaper excluding the connecting tape. , The symbol L indicates the total length of the diaper. Unless otherwise specified, the dotted pattern portion in the cross-sectional view shows a hot melt adhesive as a joining means for joining the constituent members located on the front side and the back side thereof. Hot melt adhesives are known such as slot coating, continuous linear or dotted bead coating, spiral, Z, wavy, etc. spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). It can be applied by the method. Instead of or in conjunction with this, at the fixed portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As the fixing or joining means for joining each component, a means by welding a material such as a heat seal or an ultrasonic seal can also be used. Where liquid permeability in the thickness direction is required, components adjacent in the thickness direction are fixed or joined in an intermittent pattern. For example, when performing such intermittent fixing or joining with a hot melt adhesive, it is possible to preferably use intermittent pattern coating such as spiral shape, Z shape, and wavy shape, and the range is equal to or larger than the coating width by one nozzle. When applying, it is possible to apply an intermittent pattern such as a spiral shape, a Z shape, or a wavy shape with or without a gap in the width direction.

This articulated disposable diaper has a crotch portion M including the center of the anterior-posterior LD, a ventral portion F extending anteriorly from the center of the anterior-posterior LD, and a dorsal portion B extending posteriorly from the center of the anterior-posterior LD. Have. In addition, this articulated disposable diaper has an absorbent body 56 built in a range including the crotch portion M, a liquid-permeable top sheet 30 that covers the front side of the absorbent body 56, and a liquid impermeable material that covers the back side of the absorbent body 56. It has a property sheet 11 and an exterior nonwoven fabric 12 that covers the back side of the liquid impermeable sheet 11 and constitutes the outer surface of the product.

Hereinafter, the materials and characteristic parts of each part will be described in order. As the nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose. Examples of the constituent fibers of the non-woven fabric include olefin-based fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers (including single-component fibers and composite fibers such as core sheaths), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be mixed and used. In order to increase the flexibility of the non-woven fabric, it is preferable that the constituent fibers are crimped fibers. Further, the constituent fibers of the non-woven fabric include hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by the water-repellent agent) even if they are hydrophilic fibers (including fibers made hydrophilic by the hydrophilizing agent). ) May be. In addition, the non-woven fabric generally has a short fiber non-woven fabric, a long fiber non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, a spunlace non-woven fabric, a thermal bond (air-through) non-woven fabric, and a needle punch depending on the fiber length, the sheet forming method, the fiber bonding method, and the laminated structure. It is classified into non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics having a melt blown layer sandwiched between spunbond layers, SMMS non-woven fabrics, etc.), and any of these non-woven fabrics can be used.
(Absorber)
The absorber 56 is a portion that absorbs and retains the excrement liquid, and can be formed by an aggregate of fibers. The fiber aggregate is a filament aggregate obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed. Can also be used. The fiber texture may be, for example, about 100 to 300 g / m ² in the case of stacking cotton-like pulp or staple fibers, and about 30 to 120 g / m ² in the case of filament aggregates. 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 pieces per 2.54 cm, preferably 10 to 50 pieces, and more preferably about 15 to 50 pieces. In addition, crimped fibers that have been uniformly crimped can be used.

(Highly absorbent polymer particles)
The absorber 56 may contain high-absorbent polymer particles in part or all of the absorber 56. The highly absorbent polymer particles include "powder" as well as "particles". As the highly absorbent polymer particles, 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, sifting (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 sifting (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, starch-acrylonitrile copolymer kendies, and cross-linking of sodium carboxymethyl cellulose. A substance, an acrylic acid (salt) polymer, or the like can be used. As the shape of the highly absorbent polymer particles, the commonly used powder or granular material 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, 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 absorption amount required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can usually be 50 to 350 g / m ² .

(Packaging sheet)
The absorber 56 can be incorporated as an absorbent element 50 wrapped in a packaging sheet 58 in order to prevent the highly absorbent polymer particles from coming off or to improve the shape retention of the absorber 56. As the packaging sheet 58, tissue paper, particularly crepe paper, non-woven fabric, polylami non-woven fabric, a sheet having small holes, or 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 SMMS (spunbond / meltblown / meltblown / spunbond) non-woven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene or the like can be used as the material. The fiber basis weight is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

As shown in FIG. 3, the packaging sheet 58 has a structure in which the entire absorber 56 is wrapped by one sheet, or the entire absorber 56 may be wrapped by a plurality of sheets such as two upper and lower sheets. The packaging sheet 58 may be omitted.

(Top sheet)
The top sheet 30 has liquid permeability, and for example, a perforated or non-perforated non-woven fabric, a perforated plastic sheet, or the like can be used. The storage gap described later is particularly significant when the top sheet is a hydrophilic non-woven fabric.

The top sheet 30 extends from the front end to the rear end of the product in the front-rear direction, but can be appropriately deformed as needed.
Further, the top sheet 30 extends to the outside of the starting point (blocking position) of the rising gather 60, which will be described later, in the width direction WD. The top sheet 30 in the illustrated example extends laterally from the absorber 56, but for example, when the starting point (blocking position) of the rising gather 60 described later is located on the center side in the width direction with respect to the side edge of the absorber 56. Etc., if necessary, the width of the top sheet 30 can be made shorter than the total width of the absorber 56, and the like can be appropriately deformed.

(Intermediate sheet)
An intermediate sheet (also referred to as a "second sheet") 40 can be provided on the back side of the top sheet 30 in order to prevent the liquid that has passed through the top sheet 30 from regurgitating. The intermediate sheet 40 may be omitted.

As the intermediate sheet 40, various non-woven fabrics can be preferably used, and particularly bulky air-through non-woven fabric can be preferably used. It is preferable to use a composite fiber having a core-sheath structure for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. The basis weight is preferably 17 to 80 g / m ² , more preferably 25 to 60 g / m ² . The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.

Although the intermediate sheet 40 in the illustrated example is arranged in the center shorter than the width of the absorber 56, it may be provided over the entire width. Further, the intermediate sheet 40 may be provided over the entire length of the diaper, but may be provided only in the intermediate portion including the excretion position as shown in the illustrated example.

(Liquid impermeable sheet)
The liquid-impermeable sheet 11 is not particularly limited, but is preferably one having moisture permeability. The liquid-impermeable sheet 11 is a microporous product obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction. The sheet can be preferably used. Further, as the liquid impermeable sheet 11, a material having a non-woven fabric as a base material and having improved waterproofness can also be used.

The liquid-impermeable sheet 11 has an extending portion 11E extending outward in the width direction WD from the top sheet 30. It is desirable that the liquid impermeable sheet 11 extends in the same or wider range as the absorber 56 in the anteroposterior LD and the width WD.

(Exterior non-woven fabric)
The exterior nonwoven fabric 12 covers the entire back side of the liquid-impermeable sheet 11 and gives the outer surface of the product a cloth-like appearance. The non-woven fabric can be used alone or in layers. In the latter case, it is preferable to bond the nonwoven fabrics to each other with a hot melt adhesive or the like. When a non-woven fabric is used, it is preferable that the constituent fibers have a fineness of 1.0 to 6.0 dtex, a basis weight of 15 to 45 g / m ² , and a thickness of 0.5 to 3.0 mm.

A sheet other than the nonwoven fabric can be used instead of the exterior nonwoven fabric 12, or the exterior nonwoven fabric 12 can be omitted.

(End flap part, side flap part)
The articulated disposable diaper of the illustrated example has a pair of end flap portions EF having no absorber 56 extending to the front side and the rear side of the absorber 56, respectively, and lateral to both side edges of the absorber 56. Each has a pair of side flap portions SF that do not have an absorber 56 and extend. As shown in the illustrated example, the side flap portion SF may be made of a material (exterior nonwoven fabric 12 or the like) continuous from the portion having the absorber 56, or may be formed by attaching another material.

(Plane gather)
A side elastic member 64 made of an elongated elastic member such as a rubber thread is fixed to each side flap portion SF in a state of being extended along the front-rear direction LD, whereby the leg circumference portion of each side flap portion SF is fixed. Is configured as a plane gather. As shown in the illustrated example, the side elastic member 64 is provided between the gathered nonwoven fabric 62 and the liquid-impermeable sheet 11 on the outer side in the width direction near the joining start end in the joined portion of the gathered nonwoven fabric 62, and the side flap portion SF. It can also be provided between the liquid impermeable sheet 11 and the exterior nonwoven fabric 12 in the above. A plurality of side elastic members 64 may be provided on each side as shown in the illustrated example, or only one side elastic member 64 may be provided on each side.

The plane gather is a portion on which the contraction force of the side elastic member 64 acts (a portion in which the side elastic member 64 is shown in the drawing). Therefore, in addition to the form in which the side elastic member 64 exists only in the portion of the plane gather, the side elastic member 64 exists on the front side, the rear side, or both sides of the plane gather, but the side elasticity other than the portion of the plane gather. When the member is finely cut in one place or many places, or is not fixed to the sheet sandwiching the side elastic member 64, or both of them, a contraction force acts on a part other than the plane gather. However, it also includes a structure in which the contractile force of the side elastic member 64 acts only on the portion of the plane gather (substantially equivalent to not providing the elastic member).

(Get up gather)
In order to prevent excrement that travels laterally along the top sheet 30 and prevent so-called lateral leakage, on both sides of the surface widthwise WD, along the excrement blocking position, the top sheet 30 A rising gather 60 that rises from the surface is provided.

In the rising gather 60, the root portion 65 fixed to the portion including the surface of the top sheet 30 outside the blocking position, the main body portion 66 extending from the root portion 65, and both ends of the main body portion 66 in the front-rear direction are laid down. A gathered nonwoven fabric 62 having an inverted portion 67 fixed to a state and a non-fixed raised portion 68 located between the front and rear inverted portions 67 of the main body portion 66, and gather elasticity fixed to at least the tip portion of the raised portion 68. It has a member 63 and the like.

The gathered nonwoven fabric 62 of the example shown in FIGS. 3 and 8 has a two-layer structure of an inner layer 62n and an outer layer 62f by being folded in half at the tip of the main body 66 (the end opposite to the root 65 side). A gather elastic member 63 is provided between the inner layer 62n and the outer layer 62f. Even if the inner layer 62n extends to the root portion 65 as shown in FIGS. 3 and 8, or extends only to the intermediate position of the raised portion 68 having the gathered elastic member as shown in FIG. 9 (b). good. That is, a single layer portion may be provided on the root portion 65 side of the rising portion 68. Further, the gathered nonwoven fabric 62 may have a layer structure of three or more layers. When the gathered nonwoven fabric 62 has a multi-layer structure, the number of layers may be increased by attaching another nonwoven fabric without folding one nonwoven fabric or by folding one nonwoven fabric to increase the number of layers. ..

The root portion 65 has a joint start end in the width direction WD on the side portion of the top sheet 30, and the joint start end is continuous in the front-rear direction as a cutoff position 60B. Further, the root portion 65 has an extending portion 65E extending outward in the width direction from the top sheet 30, and this extending portion is the inner surface of each side flap portion SF, that is, liquid-free in the illustrated example. It is bonded to the side portion of the permeable sheet 11 and the side portion of the exterior nonwoven fabric 12 located outside in the width direction by a hot melt adhesive or the like.

The inside of the rising gather 60 in the width direction from the joint start end is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the portion in between is a non-fixed free portion, and this free portion is the contraction of the elastic member 63. It stands up by force and comes into close contact with the surface of the body.

The main body 66 of the rising gather 60 is folded back toward the body side from the widthwise central end edge of the proximal end side portion 66B extending inward in the width direction from the outer portion in the width direction and the proximal end side portion 66B. When both ends of the main body 66 in the front-rear direction are fixed to form the inverted portion 67 in a state of being folded in half having the tip side portion 66A extending to the outside, the raised portion 68 is as shown in FIG. 8 (b). It bends so that the tip side portion 66A comes into contact with the wearer's skin.

The type of the gathered nonwoven fabric 62 is not particularly limited, but usually, a water-repellent nonwoven fabric is used in order to ensure liquid blocking property. In particular, a non-woven fabric having a melt blown layer between the spunbond layers (SMS non-woven fabric, SMMS non-woven fabric, SMSS non-woven fabric, SMSMS non-woven fabric) is suitable in terms of achieving both touch and liquid barrier properties. The non-woven fabric can be used alone or in layers. In the latter case, it is preferable to bond the nonwoven fabrics to each other with a hot melt adhesive or the like.

As the gather elastic member 63, thread rubber or the like can be used. As shown in FIGS. 1 and 2, a plurality of gather elastic members 63 are provided, and one each can be provided. The elongation rate of the gathered elastic member 63 in the unfolded state can be appropriately determined, but can be, for example, about 200 to 260%.

(Wing part)
In this connected disposable diaper, the dorsal portion B has a wing portion WP extending outward from the crotch portion M in the width direction WD. Similarly, the ventral portion F also has a wing portion WP extending outward of the WD in the width direction from the crotch portion M. These wing portions WP can also be formed by a member different from the other portions. However, in the structure having the side flap portion SF as shown in the illustrated example, the concave shape from the side edge of the crotch portion M to the lower edge 71 of the wing portion by cutting the middle of the LD in the anteroposterior direction at the side portion of the side flap portion SF. It is preferable that the edge 70 is formed and the wing portion WP is formed as a result because it is easy to manufacture.

(Connecting tape)
As shown in FIGS. 1, 2 and 6, the wing portion WP in the dorsal portion B is provided with a connecting tape 13 that is detachably connected to the outer surface of the ventral portion F, respectively. When wearing the diaper 10, the connecting tape 13 is turned from both sides of the waist to the outer surface of the ventral portion F, and the connecting portion 13A of the connecting tape 13 is connected to an appropriate position on the outer surface of the ventral portion F.

As shown in FIGS. 6 and 7, the connecting tape 13 includes a base end portion 13C fixed to the wing portion WP, a sheet base material forming a main body portion 13B extending from the base end portion 13C, and the sheet base. It has a connecting portion 13A with respect to the ventral portion F provided in the middle portion of the main body portion 13B of the material in the width direction WD. In the main body portion 13B, the base end portion 13C side from the connecting portion 13A is a non-connecting portion that is not connected to the ventral side portion F, and the opposite side is a knob portion. These non-connecting portions and knob portions are composed only of a sheet base material forming the main body portion 13B. The side edge of the base end 13C may coincide with the side edge of the wing portion WP, or, as shown in FIG. 6, is slightly spaced inward in the widthwise direction from the side edge of the wing portion WP. May be good. The inner edge of the connecting portion 13A in the width direction may coincide with the side edge of the wing portion WP, but as shown in FIG. 6, the side edge of the wing portion WP is sufficiently outward in the width direction WD. It is preferable that they are separated.

As the connecting portion 13A, 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.

Further, as the sheet base material forming the base end portion 13C to the main body portion 13B, a non-woven fabric, a plastic film, a polylami non-woven fabric, paper or a composite material thereof can be used, but the fineness is 1.0 to 3.5 dtex. A spunbonded non-woven fabric, an air-through non-woven fabric, or a spunlaced non-woven fabric having a texture of 60 to 100 g / m ² and a thickness of 1 mm or less is preferable.

The connecting tape 13 may have at least a part of the non-connecting portion that expands and contracts in the width direction WD, or may not expand and contract as a whole.

(Target part)
A target portion 12T is provided at a connecting portion of the connecting tape 13 in the ventral portion F. As shown in the illustrated example, the target portion 12T can be provided by attaching a sheet material for facilitating connection to the outer surface of the ventral portion F.

The sheet material for forming the target portion 12T is not particularly limited, but when the connecting portion 13A is a hook material, for example, long fibers in which fibers are partially welded to each other by ultrasonic welding of an intermittent pattern. Non-woven fabric can be used.

Further, when the connecting portion 13A is a hook material, as a sheet material for forming the target portion 12T, a large number of loop threads in which the engaging protrusions of the hook material are entangled are sewn on the surface of the base material made of a plastic film or a non-woven fabric. It is possible to use the composite sheet material obtained.

Further, when the connecting portion 13A is a hook material and the connecting portion of the connecting tape 13 on the ventral side portion F is made of a nonwoven fabric (for example, when the exterior nonwoven fabric 12 is provided as shown in the illustrated example), the target portion 12T is formed. Therefore, without adding the sheet material, the target portion 12T can be set at an appropriate position of the exterior nonwoven fabric 12, and the hook material can be entwined with the fibers of the exterior nonwoven fabric 12 and connected.

On the other hand, when the connecting portion 13A is an adhesive layer, the surface of the sheet material made of a plastic film having a smooth surface and having a high adhesiveness is subjected to a peeling treatment as a sheet material for forming the target portion 12T. Things can be used.

(Reservoir gap)
As shown in FIGS. 1 and 8A, the extending portion 65E of the base portion 65 of the rising gather 60 and the extending portion 11E of the liquid impermeable sheet 11 are placed at the blocking position 60B without going through the top sheet 30. The outer joint portion 69 is formed by being continuously joined in the direction along the line, and the root portion 65 and the liquid permeable sheet 11 are joined between the end portion of the top sheet 30 and the outer joint portion 69. Instead, it is preferable to have a storage gap 80 in which the upper part is covered with the gathered nonwoven fabric 62 and the lower part is covered with the liquid impermeable sheet 11. In this case, if the root portion 65 of the rising gather 60 is fixed to the surface of the top sheet 30, the excrement permeates the top sheet 30 and rises when the state of blocking the excrement by the rising gather 60 continues. It reaches the back side of the root portion 65 of the gather 60. Here, the outer joint portion 69 is not adjacent to the end portion of the top sheet 30, but a storage gap 80 (storage space) is interposed. Therefore, the excrement liquid that permeates the top sheet 30 and rises up and reaches the back side of the root portion 65 of the gather 60 can escape to the storage gap 80 instead of immediately losing the escape place, and permeates the gather non-woven fabric 62 by that amount. It becomes difficult to seep out on the surface.

As long as the storage gap 80 extends from the outer edge of the top sheet 30 to the outer joint portion 69, as shown in FIG. 8 (b), the storage gap 80 is inside the outer edge of the top sheet 30 (center of the width direction WD). It may extend to the side).

The dimension 81 of the WD in the width direction of the storage gap 80 may be appropriately determined, but is usually preferably about 5 to 20 mm. As shown in the illustrated example, when each side flap portion SF has a side elastic member 64 for forming a plane gather, the dimension of the storage gap 80 in the width direction WD (the direction orthogonal to the direction along the cutoff position 60B). Can be 0.5 to 1.0 times the distance between the cutoff position 60B and the side elastic member 64 in the width direction WD.

It is preferable that the storage gaps 80 are continuously provided in the front-rear direction LD, but a plurality of storage gaps 80 may be provided intermittently. The size 82 of the front-rear LD of the storage gap 80 (total in the case of a plurality of cases) may be appropriately determined, but usually, it is about 0.5 to 2.0 times the size of the front-rear LD of the rising portion 68. It is possible, and it is particularly preferable that it is 1.0 to 1.8 times.

Further, when each side flap portion SF has a side elastic member 64 for forming a plane gather, the distance D1 in the width direction WD between the storage gap 80 and the side elastic member 64 is 3 mm or less (that is, 0 to 3 mm). In particular, when it is 0.1 to 3.0 mm, wrinkles are more likely to occur in the members above and below the storage gap 80 due to the contraction force of the side elastic member 64, and the storage gap 80 is formed thicker and more reliably. Therefore, it is preferable.

As shown in FIG. 8, the end portion of the top sheet 30 may extend to the outside of the WD in the width direction as a single layer without folding back, or may be once (or a plurality of times) as shown in FIG. 9A. It may be folded back and a plurality of layers may be laminated. When the end portion of the top sheet 30 is folded back and has a plurality of layers as in the latter case, there is an advantage that the storage gap 80 is formed thicker and more reliably. In particular, in the latter case, if the layers at the ends of the top sheet 30 are not joined, a large gap is likely to be formed between the layers, the storage gap 80 becomes thicker as a whole, and the portion including the end of the top sheet 30 is included. Is preferable because it does not become hard. The dimension 31W of the width direction WD of the folded portion 31 can be appropriately determined, but usually, it can be about 0.2 to 1.0 times the dimension 81 of the width direction WD of the storage gap 80.

As shown in FIG. 9B, it is also preferable that the recess 85 recessed upward is intermittently formed at least in the front-rear direction LD on the lower surface of the portion of the gathered nonwoven fabric 62 that covers the upper part of the storage gap 80. Along with this (or instead), as shown in the figure, a recess 86 recessed downward is provided at least intermittently in the anteroposterior LD on the upper surface of the portion of the liquid impermeable sheet 11 that covers the lower part of the storage gap 80. It is also preferable that it is formed in. By providing these recesses 85 and 86, the storage gap 80 can be formed more reliably and more reliably. When these recesses 85, 86 are provided, the dimensions, spacing, etc. of the recesses 85, 86 may be appropriately determined. As an example, the dimension of the width direction WD of the recesses 85 and 86 can be about 0.2 to 0.5 times the dimension of the storage gap 80 in the width direction 81. Further, the dimension of the LD in the front-rear direction of the recesses 85 and 86 can be about 0.5 to 2.0 times the dimension 81 in the width direction of the storage gap 80. Further, although the distance between the front-rear LDs of the recesses 85 and 86 can be appropriately determined, it can be about 0.2 to 2.0 times the dimension of the front-rear LDs of the recesses 85 and 86. The planar shape of the recesses 85 and 86 can be an appropriate shape such as a triangle, a polygon such as a rectangle, or a circle, and can be formed by shaping such as embossing.

As shown in FIG. 1, when the storage gap 80 is continuous over a wide range (in the illustrated example, the entire area of the LD in the anteroposterior direction of about 68 minutes of the rising portion), the surface of the portion having the storage gap 80 rises over a wide range, which makes it look good. And the wearing feeling may deteriorate. Therefore, as shown in FIG. 10, in the range from the outer edge of the top sheet 30 to the outer joint portion 69, the storage gap 80, the root portion 65, and the auxiliary joint portion 89 to which the liquid impermeable sheet 11 is joined are joined. It is also preferable to alternately and repeatedly provide and at least in the front-rear direction LD (preferably both the front-rear direction LD and the width direction WD) to suppress the floating of the surface. In this case, the dimensions and spacing of the auxiliary joints 89 may be appropriately determined. As an example, the dimension of the widthwise WD of the auxiliary joint 89 can be about 0.2 to 1.0 times the widthwise dimension 81 of the storage gap 80, and particularly 0.2 to 0.5 times. The degree is preferable. Further, it is desirable that the auxiliary joint portion 89 is separated from the outer edge of the WD in the width direction of the storage gap 80. Further, the dimension of the LD in the front-rear direction of the auxiliary joint portion 89 can be about 0.2 to 1.0 times the dimension 81 in the width direction of the storage gap 80. Further, although the distance between the front-rear LDs of the auxiliary joint 89 can be appropriately determined, it can be about 0.5 to 3.0 times the dimension of the front-rear LD of the auxiliary joint 89.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.

The "MD direction" and the "CD direction" mean the flow direction (MD direction) in the manufacturing equipment and the lateral direction (CD direction) orthogonal to the flow direction, and one of them is the front-rear direction of the product. The other is in the width direction of the product. The MD direction of the nonwoven fabric is the direction of the fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the non-woven fabric are aligned. It can be discriminated by a simple measurement method for determining the orientation direction.

-The "front-back direction" means the direction (vertical direction) indicated by the symbol LD in the figure, and the "width direction" means the direction (horizontal direction) indicated by WD in the figure, and the front-back direction and the width direction. Are orthogonal.

-The "front side" means the one closer to the wearer's skin when worn, and the "back side" means the one farther from the wearer's skin when worn.

-The "front surface" means the surface of the member closer to the wearer's skin when worn, and the "back surface" means the surface farther from the wearer's skin when worn.

The "expanded state" means a state in which the product is deployed flat without shrinkage (including any contraction such as contraction due to an elastic member) or slack.

The "elongation rate" means a value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

"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.

"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).

"Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device in a standard state (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 with a temperature of 100 ° C. For fibers with an official moisture content of 0.0%, pre-drying does not have to be performed. From the test piece in a constant weight state, 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 is measured and multiplied by 100 to calculate the weight per square meter, which is used as a basis weight.

The "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression tester) under the conditions of a load of 0.098 N / cm ² and a pressurized area of 2 cm ² .

The "porosity" is measured by the following method. That is, the portion of the middle sheet other than the joint is cut into a rectangular shape and used as a sample. Measure the length, width, thickness and weight of the sample. Using the raw material density of the non-woven fabric, the virtual weight is calculated when the volume is the same as that of the sample and the porosity is 0%. Substitute the sample weight and virtual weight into the following equation to obtain the porosity.
Porosity = [(Virtual Weight-Sample Weight) / Virtual Weight] x 100

The "water absorption amount" 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. do.

Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

If there is no description of 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%). ..

The present invention is not limited to the tape type disposable diaper as in the above example as long as it is provided with rising gathers, and can be used for all disposable diapers such as pad type and pants type, as well as other absorption of sanitary napkins and the like. It can also be used for sex goods.

11 ... Liquid impermeable sheet, 12 ... Exterior non-woven fabric, 12T ... Target part, 13 ... Connecting tape, 13A ... Connecting part, 13B ... Main body part, 13C ... Base end part, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Rising gather, 60B ... Blocking position, 62 ... Gathered non-woven fabric, 62n ... Inner layer, 62f ... Outer layer, 63 ... Gather elastic member, 64 ... Side elastic member , 65 ... root part, 66 ... main body part, 67 ... inverted part, 68 ... rising part, 69 ... outer joint part, 80 ... storage gap, 85,86 ... auxiliary joint part, 89 ... auxiliary joint part, M ... crotch part , WD ... width direction, LD ... front-back direction.

Claims (7)

Absorber and
A liquid-permeable top sheet placed on the front side of the absorber,
A liquid impermeable sheet placed on the back side of the absorber,
With a rising gather that rises from the surface of the top sheet along the excrement blocking position,
The rising gathers are a root portion attached to a portion outside the cutoff position including the surface of the top sheet, a main body portion protruding from the root portion, and both ends of the main body portion in a direction along the cutoff position. A gathered nonwoven fabric having an inverted portion formed by fixing the raised portion in an inverted state and a raised portion formed by not fixing the portion between the inverted portions in the main body portion, and attached to at least the tip portion of the raised portion. It has a gathered elastic member and is
The top sheet has an end on the outside of the cutoff position.
The root portion and the liquid impermeable sheet each have an extending portion extending outward from the top sheet.
The extending portion of the root portion and the extending portion of the liquid impermeable sheet are continuously joined in a direction along the blocking position without interposing the top sheet to form an outer joining portion.
From the outer edge of the top sheet to the outer joint, the root and the liquid-impermeable sheet are not joined, the upper part is covered with the gathered non-woven fabric, and the lower part is covered with the liquid-impermeable sheet. Have a sunk gap,
An absorbent article characterized by that. The outer joint portion has a side elastic member extending in a direction along the cutoff position.
The portion having the side elastic member contracts in the front-rear direction together with the side elastic member to form wrinkles, and is expandable in the front-rear direction.
The distance between the storage gap and the side elastic member in the width direction is 3 mm or less.
The absorbent article according to claim 1. The edge of the top sheet is folded back once or a plurality, and a plurality of layers are laminated.
The absorbent article according to claim 1 or 2. The layers of the folded portion of the top sheet are not joined,
The absorbent article according to claim 3. A recess recessed upward is formed at least intermittently in the front-rear direction on the lower surface of the portion of the gathered nonwoven fabric that covers the upper part of the storage gap.
The absorbent article according to any one of claims 1 to 4. On the upper surface of the portion of the liquid impermeable sheet that covers the lower part of the storage gap, a recess that is recessed downward is formed at least intermittently in the front-rear direction.
The absorbent article according to any one of claims 1 to 5. In the range from the outer edge of the top sheet to the outer joint portion, the storage gap and the concave portion to which the root portion and the liquid impermeable sheet are joined are repeatedly provided at least alternately in the front-rear direction. ing,
The absorbent article according to any one of claims 1 to 6.

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