JP2019150394A5 - - Google Patents

Description

Stretchable structure of absorbent goods

The present invention relates to a stretchable structure of an absorbent article with improved fit to a local, three-dimensional convex portion of the body surface and its surroundings.

In an absorbent article, in order to improve the fit to the body surface, it is common to impart elasticity to appropriate places such as around the legs and the waist. As a method for imparting elasticity, a method of arranging and fixing a large number of elongated elastic members such as rubber threads in a stretched state in the longitudinal direction has been widely adopted, but it is excellent in surface fit. As a method, a method of attaching the elastic sheet in a stretched state in the direction of imparting elasticity has also been proposed. (See, for example, Patent Document 1).

In the laminated stretchable structure in which this elastic sheet is sandwiched between cover layers, an elastic sheet is formed between a first cover layer made of a non-stretchable material such as a non-woven fabric and a second cover layer made of a non-stretchable material such as a non-woven fabric. It is made of laminated fabric. The elastic sheet is stretched in the expansion / contraction direction (one direction orthogonal to the thickness direction), and a large number of first cover layers and second cover layers are arranged at intervals in the expansion / contraction direction and in the direction orthogonal to the expansion / contraction direction. At the joint, the joint is made through a through hole formed in the elastic sheet. In the state of natural length, shrinkage wrinkles are formed on the first cover layer and the second cover layer as the elastic sheet shrinks, and in the state where the elongation is maximum (elastic limit state), the first cover layer accompanies the elongation of the elastic sheet. And the second cover layer becomes taut, and the shrinkage wrinkles disappear. This laminated stretchable structure is not only excellent in surface fit, but also has no bonding between the first cover layer and the second cover layer and the elastic sheet, and the bonding between the first cover layer and the second cover layer is extremely small. Therefore, it is very flexible, and there is an advantage that the through hole of the elastic sheet also contributes to the improvement of air permeability.

However, the expansion / contraction direction of such a laminated expansion / contraction structure is limited to the direction in which the elastic sheet is extended at the time of manufacture, that is, the direction orthogonal to the thickness direction. Therefore, there is room for improvement in the fit to local, three-dimensional protrusions on the body surface such as the iliac crest and the anterior superior iliac spine and their surroundings.

Further, in the above-mentioned laminated stretchable structure, since the elastic sheet in the stretched state is sandwiched between the first cover layer and the second cover layer, the arrangement of the stretchable structure is limited depending on the structure of the product and the manufacturing method. Further, in the above-mentioned laminated stretchable structure, the shrinkage wrinkles inevitably formed on the first cover layer and the second cover layer give the appearance peculiar to disposable diapers.

On the other hand, there is also known a laminated stretchable structure in which a cover layer in which a linear slit is formed in a non-stretchable material such as a non-woven fabric is integrated with an elastic sheet (see Patent Document 3). In the laminated stretchable structure using the cover layer having the slit, even if the elastic sheet is integrated with the cover layer in the non-stretched state, the slit can be opened so as to widen toward the center side, so that the opening can be deformed. It can be expanded and contracted mainly in the direction that intersects the slit within the range. Of course, in the laminated stretchable structure using the cover layer having the slit, even when the elastic sheet is integrated with the slit sheet in the stretched state, the elastic sheet can be stretched in the stretched direction at the time of manufacturing. It can be expanded and contracted in the direction orthogonal to the slit within the range of deformation of the opening of the slit. However, the opening deformation of a linear slit has many restrictions on the direction and the like, and the direction of expansion and contraction, the shape of the stretchable portion, the degree of expansion and contraction, and the like are limited by the arrangement and dimensions of the slit.

Further, as another example of a laminated stretchable structure using a cover layer having slits, a cover layer in which a large number of fine linear slits are arranged in a dense staggered pattern and an elastic sheet are integrated. (See Patent Document 4). In this case, by opening the slits so as to widen toward the center side, the cover layer extends in the direction orthogonal to the slits and becomes a diagonal mesh. However, also in this case, since the slit is linear, the expansion / contraction direction and the degree of expansion / contraction are limited.

Special Table 2004-532758 Japanese Unexamined Patent Publication No. 2016-189826 Japanese Unexamined Patent Publication No. 2015-173689 Special Table 2006-511375 Gazette

Therefore, a main object of the present invention is to provide an elastic structure of an absorbent article having excellent fit to a local and three-dimensional convex portion of a body surface and a peripheral portion thereof.

Various aspects of the stretchable structure of the absorbent article that solves the above problems are as follows.
<First aspect>
The elastic sheet, the first cover layer covering the front side of the elastic sheet, and the second cover layer covering the back side of the elastic sheet are integrated.
The first cover layer and the second cover layer do not have elasticity and do not have elasticity.
It has a three-dimensional deformation region in the region where the first cover layer, the second cover layer and the elastic sheet overlap.
The first cover layer and the second cover layer in the three-dimensional deformation region are provided with a plurality of slit portions formed of slits or perforations for forming the slits.
The plurality of slit portions extend from one edge portion of the three-dimensional deformation region to the other edge portion across the three-dimensional deformation region.
The plurality of slits intersect with each other and
All of the portions of the first cover layer and the second cover layer located within the three-dimensional deformation region are continuous with the portions located outside the three-dimensional deformation region without passing through the slit portion.
An elastic structure of an absorbent article, characterized in that.

(Action effect)
In the telescopic structure of the absorbent article of this embodiment, the elastic sheet expands each slit portion with deformation of the first cover layer and the second cover layer so that the plurality of slit portions expand larger as they approach their intersection positions. It can be elastically stretched according to the above. As a result, when a force is applied to the three-dimensional deformation region from one side in the thickness direction to the other side, the three-dimensional deformation region follows this and extends mainly in a plurality of directions orthogonal to each slit portion. , Can be deformed so as to be recessed with respect to the surrounding portion. Therefore, if such a three-dimensional deformation region that is dented and deformed is provided at a position in contact with a local and three-dimensional convex portion on the body surface, the fit to the convex portion and its surrounding portion becomes excellent.
Further, since the three-dimensional deformation region is determined by a plurality of slit portions, there is no limitation on the expansion / contraction direction and the degree of expansion / contraction can be increased as compared with the conventional example based on one linear slit. it can.
Further, since all the portions of the first cover layer and the second cover layer located in the three-dimensional deformation region are continuous with the portions located outside the three-dimensional deformation region without passing through the slit portion, the existing parts are existing. In the manufacturing equipment, it is possible to manufacture by simply providing a slit portion in the first cover layer and the second cover layer.

<Second aspect>
In the three-dimensional deformation region, in the state of natural length, shrinkage wrinkles formed by shrinkage of the elastic sheet are not formed in the first cover layer and the second cover layer.
The stretchable structure of the absorbent article of the first aspect.

(Action effect)
The stretchable structure with the slit portion may be attached with the elastic sheet stretched at the time of manufacturing, but it is not necessary. Therefore, by integrating the elastic sheet with the first cover layer and the second cover layer in a state where the elastic sheet is not substantially stretched at the time of manufacturing, wrinkles (including folds) are not formed as in the present embodiment, and the elastic sheet expands and contracts in a good appearance. It becomes a structure. In this case, since only the slit portion is provided in the first cover layer and the second cover layer, there is an advantage that the elastic sheet is neatly concealed by the first cover layer and the second cover layer in the natural length state.

<Third aspect>
The slit portion includes a plurality of slit portions that pass through the central portion of the three-dimensional deformation region and have both end portions extending to the edges of the three-dimensional deformation region.
The stretchable structure of the absorbent article of the first or second aspect.

(Action effect)
As in this embodiment, the slit portion may include a plurality of slit portions that pass through the central portion. In this case, the slit portion extends radially (including X-shaped and cross-shaped) from the central portion of the three-dimensional deformation region. In this embodiment, a wide range of three-dimensional deformation regions can be formed with a minimum number of slits. This aspect is suitable when the three-dimensional deformation region is circular, elliptical, or rhombic.

<Fourth aspect>
The slit portion passes through the central portion of the three-dimensional deformation region, and both ends pass through a central slit portion whose both ends extend to the edge portion of the three-dimensional deformation region and the end portion of the central slit portion, and both ends thereof are three-dimensional. Including an end slit portion extending to the edge of the deformed region,
Stretchable structure of an absorbent article according to any one of the first to third aspects.

(Action effect)
As in this aspect, a central slit portion and an end slit portion passing through the end portion thereof can be included. In this case, the slit portion extends in a T-shape, an H-shape, or the like. This aspect is suitable when the three-dimensional deformation region is a triangle or a rectangle.

<Fifth aspect>
The absorbent article
It has a crotch part including the center in the anterior-posterior direction, a ventral part extending anteriorly from the center in the anterior-posterior direction, and a dorsal part extending posteriorly from the center in the anteroposterior direction.
It has an absorber built in the range including the crotch part, and has an absorber.
The ventral portion and the dorsal portion have side flap portions extending to the left and right sides of the absorber.
The side flap portion of the dorsal portion has a connecting means for detachably connecting the dorsal portion and the ventral portion.
A target portion to which the connecting means is connected is provided on the outer surface of the ventral portion.
Tape type disposable diaper,
The three-dimensional deformation region is provided on at least one of the side flap portion of the dorsal portion in the width direction of the connecting means and the side flap portion of the ventral portion of the side flap portion of the ventral portion on the outside of the target portion in the width direction.
Stretchable structure of an absorbent article according to any one of the first to fourth aspects.

(Action effect)
In tape-type disposable diapers, the parts of the dorsal side flaps that are laterally medial to the connecting means and the ventral side flaps that are laterally lateral to the target are the iliac crest and the anterior superior iliac spine. It becomes the part in contact with the local and three-dimensional convex part of the body surface. Therefore, it is desirable to provide a three-dimensional deformation region having the slit portion described above in this portion.

<Sixth aspect>
A waist elastic sheet that elastically expands and contracts in the width direction is attached to the back side portion at least over the left and right side flaps.
The area having the waist elastic sheet can be elastically expanded and contracted in the width direction together with the waist elastic sheet.
The three-dimensional deformation region is provided between the waist elastic sheet and the connecting means.
The stretchable structure of the absorbent article of the fifth aspect.

(Action effect)
It is known that a waist elastic sheet as in this embodiment is attached to the dorsal portion of a tape-type disposable diaper to improve the fit around the waist. It is often difficult to provide such a waist telescopic sheet close to the connecting means. This is because most tape-type disposable diapers are manufactured so that the front-back direction of the product matches the MD direction (machine direction) on the production line, and the waist elastic sheet is attached in a stretched state in the width direction. This is due to the need. However, the portion between the waist elastic sheet and the connecting means is located at the side flap portion and becomes a portion in contact with the iliac crest as described above. Therefore, it is preferable to provide a three-dimensional deformation region having the slit portion described above in this portion. The three-dimensional deformation region having the slit portion described above can be manufactured by simply providing the slit portions in the first cover body and the second cover body in advance and arranging the elastic sheet in a substantially non-extended state. A three-dimensional deformation region can be formed even at a difficult position.

According to the present invention, there are advantages such as excellent fit to a local and three-dimensional convex portion of the body surface and a peripheral portion thereof.

It is a top view in the unfolded state which shows the inner surface of a tape type disposable diaper. It is a top view in the unfolded state which shows the outer surface of a tape 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. (A) is a sectional view taken along line 8-8 of FIG. 1, and (b) is a sectional view taken along line 9-9 of FIG. (A) is a sectional view taken along line 5-5 of FIG. 1, and (b) is a sectional view taken in a deformed state. It is (a) plan view and (b) sectional view of the waist telescopic sheet in the unfolded state. It is a top view which shows various slits. It is a top view which shows various arrangement examples of a three-dimensional deformation region. It is a perspective view which shows the deformation state of a three-dimensional deformation region.

1 to 6 show an example of a tape-type disposable diaper, in which reference numeral X indicates the entire width of the diaper excluding the connecting tape, and reference numeral L indicates the total length of the diaper. The dotted pattern portion shows a hot melt adhesive as a joining means for joining the constituent members located on the front side and the back side thereof. The hot melt adhesive can be applied by a known method such as slot coating, continuous linear or dotted bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by the letterpress method). Can be applied. 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 a joining means for joining each component, a means by material welding such as a heat seal or an ultrasonic seal can also be used.

This tape-type disposable diaper has a crotch portion 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. doing. In addition, this tape-type disposable diaper has an absorber 56 built in a range including the crotch portion, a liquid-permeable top sheet 30 that covers the front side of the absorber 56, and a liquid-impermeable top sheet that covers the back side of the absorber 56. It has a sheet 11 and an exterior non-woven fabric 12 that covers the back side of the liquid-impermeable sheet and constitutes the outer surface of the product. On the other hand, side flap portions SF having no absorber 56 are formed on both sides in the width direction from the ventral portion F to the dorsal portion B, and the side flap portions SF of the dorsal portion B gradually move backward. It has a leg peripheral edge 10 extending so as to be located laterally, and a waist circumference constituent area 80 located behind the leg peripheral edge 10. The waist circumference constituent area 80 of the dorsal side portion B has a connecting tape 13 that is detachably connected to the outer surface of the ventral side portion F. In the worn state, the connecting tape 13 is connected to the outer surface of the ventral portion F. As shown in FIG. 2 and the like, the side flap portion of the ventral portion F also has a leg circumference edge 10 extending laterally toward the front and a waist circumference located behind the leg circumference edge 10. It has a constituent area 80. The leg peripheral edges 10 of the ventral portion F and the dorsal portion B are continuous, and have a constricted shape in the middle of the anterior-posterior LD of the tape-type disposable diaper. Further, the tape-type disposable diaper of the illustrated example has a pair of end flap portions EF having no absorber 56, which extend to the front side and the rear side of the absorber 56, respectively.

Hereinafter, the materials and characteristic parts of each part will be described in order.
(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 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. In addition, uniformly crimped crimped fibers can be used.

(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 celluloses. A substance or an acrylic acid (salt) polymer or the like can be used. As the shape of the highly absorbent polymer particles, a 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 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. If it exceeds 350 g / m ² , not only the effect is saturated, but also an excess of highly absorbent polymer particles gives a jerky discomfort.

(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, non-woven fabric of polylami, 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 preferable, 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 FIGS. 3 and 5, 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. Good . 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 porous plastic sheet, or the like can be used. Further, among these, the non-woven fabric is not particularly limited as to what the raw material fiber is. 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 extends from the front end to the rear end of the product in the front-rear direction and extends laterally from the absorber 56 in the width direction WD. For example, the starting point of the rising gather 60 described later is more than the side edge of the absorber 56. If necessary, such as when the top sheet 30 is located on the center side in the width direction, 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)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation speed than the top sheet 30 can be provided. The intermediate sheet 40 is for quickly transferring the liquid to the absorber, enhancing the absorption performance by the absorber, and preventing the phenomenon of "reversion" of the absorbed liquid from the absorber. The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace non-woven fabric, spunbonded non-woven fabric, SMS non-woven fabric, pulp non-woven fabric, mixed sheet of pulp and rayon, point-bonded non-woven fabric or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through non-woven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{17~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven 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 of 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)
Liquid impervious sheet 11, is not particularly limited, and is preferably has a moisture permeability. The liquid-impermeable sheet 11 is microporous obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming the sheet, and then stretching the sheet in the uniaxial or biaxial direction. The sheet can be preferably used. Further, as the liquid-impermeable sheet 11, a non-woven fabric as a base material with improved waterproofness can also be used.

It is desirable that the liquid-impermeable sheet 11 extends in the same or wider range as the absorber 56 in the front-rear direction LD and the width direction WD, but if necessary, such as when other water-impervious means are present, the liquid-impermeable sheet 11 may extend. It is also possible to have a structure that does not cover the end portion of the absorber 56 in the front-rear direction LD and the width direction WD.

(Exterior non-woven fabric)
The exterior non-woven 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 exterior non-woven fabric 12 is not particularly limited, and the material fibers include, for example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, long-fiber non-woven fabrics such as spunbonded non-woven fabrics, SMS non-woven fabrics, and SMMS non-woven fabrics are suitable in terms of both feel 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 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 .

(Get up gather)
In order to prevent excrement that travels laterally along the top sheet 30 and prevent so-called lateral leakage, rising gathers 60 that stand up on the skin side of the wearer are provided on both sides of the surface widthwise WD. Is preferable. Of course, the rising gather 60 can be omitted.

When the rising gather 60 is adopted, its structure is not particularly limited, and any known structure can be adopted. The rising gather 60 of the illustrated example is composed of a gather sheet 62 substantially continuous in the width direction WD and an elongated gather elastic member 63 fixed to the gather sheet 62 in an extended state along the front-rear direction LD. ing. A water-repellent non-woven fabric can be used as the gather sheet 62, and a rubber thread or the like can be used as the gather elastic member 63. As shown in FIGS. 1 and 2, a plurality of elastic members may be provided, and one elastic member may be provided.

The inner surface of the gather sheet 62 has a joint start end in the width direction on the side portion of the top sheet 30, and the portion outside the width direction from the joint start end is the inner surface of each side flap portion SF, that is, liquid opaque in the illustrated example. It is bonded to the side portion of the sex 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.

Around the legs, 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 part between them is a non-fixed free part, and this free part is It rises due to the contraction force of the elastic member 63 and comes into close contact with the body surface.

(Plane gather)
A side elastic member 64 made of an elongated elastic member such as 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 leg circumference elastic member 64 is provided between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction near the joint start end in the joint portion of the gather sheet 62, and also has a side flap portion. It can also be provided between the liquid-impermeable sheet 11 and the exterior non-woven fabric 12 in SF. A plurality of elastic members 64 around the legs may be provided on each side as shown in the illustrated example, or only one elastic member 64 may be provided on each side.

(Connecting tape)
The waist circumference constituent area 80 in the dorsal side portion B is provided with a connecting tape 13 as a connecting means that is detachably connected to the outer surface of the ventral side portion F. When wearing the diaper, 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.

The structure of the connecting tape 13 is not particularly limited, but in the illustrated example, the tape mounting portion 13C fixed to the waist circumference constituent area 80, the sheet base material forming the tape main body portion 13B protruding from the tape mounting portion 13C, and the sheet base material thereof. The sheet base material has a connecting portion 13A with respect to the ventral side provided in the middle portion in the width direction of the tape main body portion 13B, and the tip side from the connecting portion 13A is a knob portion. The shape of the connecting tape 13 is not particularly limited, but the tape mounting portion 13C has the longest and constant portion in the front-rear direction, and the tape body portion 13B has a tapered shape that becomes thinner toward the tip. Can be done. Further, the front-rear direction dimension of the tape mounting portion 13C is preferably 50 to 90% of the front-rear direction dimension of the waist circumference constituent area 80, and is preferably longer than the front-rear direction dimension Y1 of the three-dimensional deformation region 90 described later.

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), etc., but any shape may be used.

Further, as the sheet base material forming the tape mounting portion 13C to the tape main body portion 13B, a non-woven fabric, a plastic film, a polylace 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 20 to 100 g / m ^{2 and a thickness of 1 mm or less is preferable.}

(Target part)
It is preferable to provide a target portion at the connecting portion of the connecting tape 13 in the ventral portion F. As shown in the illustrated example, the target portion can be provided by attaching the target sheet 20 for facilitating the connection to the outer surface of the ventral portion F. When the connecting portion 13A is a hook material, the target sheet 20 can be a target sheet 20 in which a large number of loop threads are 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 connecting tape 13 on the ventral side portion F is made of a non-woven fabric, for example, when the exterior non-woven fabric 12 is provided as shown in the illustrated example, the target sheet 20 is omitted and the hook material is used as the fiber of the exterior non-woven fabric 12. It can also be entwined and connected. In this case, the target sheet 20 as a mark may be provided between the exterior non-woven fabric 12 and the liquid-impermeable sheet 11, and the mark may be printed on the outer surface of the exterior non-woven fabric 12 or the liquid-impermeable sheet 11.

(Waist elastic sheet)
A waist elastic sheet 70 elastically expands and contracts in the width direction WD is attached between at least the left and right connecting tapes 13 in the back side portion B, and the region having the waist elastic sheet 70 elastically expands and contracts in the width direction WD. It is preferable to have it. The waist elastic sheet 70 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 70, a sheet-like elastic member such as a rubber sheet may be used, but it is preferable that the waist elastic sheet 70 has 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 FIGS. 5 and 7, the support layer 71 such as two non-woven fabrics is adhered with a hot melt adhesive or the like. It is preferable that the elastic members 72 such as a perforated sheet, net, and elongated (thread-like or string-like) are fixed between the support layers 71 in a stretched state along the width direction WD while being bonded with an agent. Used for. As the material of the support layer 71 in this case, the same material as that of the exterior non-woven fabric 12 can be used. The elongation rate of the elastic member 72 is preferably about 150 to 250%. When an elongated elastic member 72 (thread-like or string-like) is used, it is preferable to provide about 5 to 15 elastic members 72 having a thickness of 420 to 1120 dtex at intervals of 72 d of 3 to 10 mm.

The width of the waist elastic sheet 70 can be appropriately determined, but it is preferable that the width extends between the left and right side flap portions SF as shown in the illustrated example. As a specific dimension, the width of the waist elastic sheet 70 is preferably about 80 to 95% of the total width X of the main body portion excluding the connecting tape 13.

Both ends of the widthwise WD of the waist stretchable sheet 70 may be non-stretchable regions 76 for being held and attached by suction during manufacturing. The dimensions of the non-stretchable region 76 and the dimensions of the intermediate stretchable region 75 located between them and expanding and contracting in the width direction WD can be appropriately determined, but the width of the intermediate stretchable region 75 is the width of the left and right connecting tapes 13 described later. The width of the non-stretchable region 76 is preferably about 45 to 90% of the width between the connecting portions 13A, and is preferably about 5 to 50 mm in order to prevent shrinkage and curling during manufacturing. The non-stretchable region 76 may be a region having no elastic member 72, but the non-stretchable region 76 is non-stretchable by attaching the elastic member 72 over the intermediate stretchable region 75 and the non-stretchable region 76 and cutting the elastic member 72 in the non-stretchable region 76. The structure may be such that the elastic member 72 remains in the region 76 but hardly expands or contracts at all.

Further, a part of the elastic member 72 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 72 overlaps with the absorber 56 is cut. As a result, if the structure is such that the elastic member 72 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 example, the waist elastic sheet 70 is arranged between the liquid-impermeable sheet 11 and the absorbing element 50, but the arrangement is not particularly limited. For example, the waist elastic sheet 70 may be arranged between the liquid-impermeable sheet 11 and the exterior non-woven fabric 12, or may be provided outside the exterior non-woven fabric 12. Further, when the exterior nonwoven fabric 12 is formed by stacking a plurality of sheets, the entire waist elastic sheet 70 may be provided between the sheets of the exterior nonwoven fabric 12.

(Three-dimensional deformation area)
Characteristically, as shown in FIGS. 1, 6 and 8, a three-dimensional deformation region 90 that is dented and deformed is provided inside the WD in the width direction from the connecting tape 13 in the side flap portion of the back side portion B. There is. That is, in the three-dimensional deformation region 90, the elastic sheet 93 having a size extending inside and outside the three-dimensional deformation region 90, the first cover layer 91 covering the front side of the elastic sheet 93, and the second cover layer 92 covering the back side are formed. It is integrated. That is, in this example, the first cover layer 91 is made of the gather sheet 62, and the second cover layer 92 is made of the exterior non-woven fabric 12. The first cover layer 91 and the second cover layer 92 are each composed of one layer in this example, but at least one of them may be composed of a plurality of integrated sheets. Needless to say, the materials used as the first cover layer 91 and the second cover layer 92 are different from those in this example, depending on the formation site of the three-dimensional deformation region 90. Further, as long as the first cover layer 91 and the second cover layer 92 do not have elasticity, the sheet contained therein may include one having elasticity, but both the front and back surfaces are made of non-woven fabric. It is preferable that it is. The term "non-stretchable" means that the elongation ratio at the elastic limit is 1.0 to 1.3 times in all directions orthogonal to the thickness direction.

The elastic sheet 93 is not particularly limited, and may be an elastic non-woven fabric as well as an elastic film as long as it is a sheet having elasticity by itself. Further, as the elastic sheet 93, in addition to a non-perforated one, a sheet having a large number of holes and slits formed for ventilation can also be used. The elastic sheet 93 is not limited by the characteristics, but for example, the tensile strength in the width direction WD (expansion / contraction direction ED, MD direction) is 8 to 25 N / 35 mm, and the front-rear direction LD (direction XD, CD orthogonal to the expansion / contraction direction). An elastic sheet 93 having a tensile strength of 5 to 20 N / 35 mm in the direction), a tensile elongation of 450 to 1050% in the width direction WD, and a tensile elongation of 450 to 1400% in the anteroposterior LD can be used. The thickness of the elastic sheet 93 is not particularly limited, but can be, for example, about 20 to 40 μm.

The first cover layer 91 and the elastic sheet 93, and the second cover layer 92 and the elastic sheet 93 can be integrated by adhering them via a hot melt adhesive or by welding at least one of them. Further, the first cover layer 91, the elastic sheet 93, and the second cover layer 92 are intermittently joined even if the entire adjacent layer is continuously joined as long as they can be expanded and contracted as a unit. May be good. Further, the integration method shown in Japanese Patent Application Laid-Open No. 2004-532758 and Japanese Patent Application Laid-Open No. 2016-189826 is adopted, and the elastic sheet 93 is sandwiched between the first cover layer 91 and the second cover layer 92. The first cover layer 91 and the second cover layer 92 may be joined through a through hole formed in the elastic sheet 93 at a large number of joints by performing ultrasonic sealing in a scattered spot shape (not shown).

Further, characteristically, the first cover layer 91 and the second cover layer 92 in the three-dimensional deformation region 90 are provided with a plurality of slit portions 95, 96 formed of slits or perforations for forming the slits. There is. These slit portions 95 and 96 extend from one edge portion of the three-dimensional deformation region 90 to the other edge portion across the three-dimensional deformation region 90 and intersect with each other. Then, all the portions of the first cover layer 91 and the second cover layer 92 located in the three-dimensional deformation region 90 are continuous with the portions located outside the three-dimensional deformation region 90 without passing through the slit portions 95 and 96. doing. As a result, in the three-dimensional deformation region 90 of this example, as in the examples shown in FIGS. 6 (b) and 10, the first cover layer 91 such that a plurality of slit portions expand larger as they approach their intersection positions. With the deformation of the second cover layer 92, the elastic sheet 93 can be elastically stretched according to the expansion of the slit portions 95 and 96.

In other words, in the three-dimensional deformation region 90, when a force is applied to the three-dimensional deformation region 90 from one side to the other in the thickness direction as shown by an arrow in FIG. 6B, the three-dimensional deformation region 90 Following this, it can be deformed so as to be recessed with respect to the peripheral portion while extending mainly in a plurality of directions orthogonal to the slit portions 95 and 96. Therefore, if such a three-dimensional deformation region 90 that is dented and deformed is provided at a position in contact with a local and three-dimensional convex portion on the body surface, the fit to the convex portion and its peripheral portion becomes excellent. Further, since the three-dimensional deformation region 90 is determined by the plurality of slit portions 95 and 96, there is no limitation on the expansion / contraction direction and the degree of expansion / contraction is large as compared with the conventional example based on one linear slit. Can be. Further, all the portions of the first cover layer 91 and the second cover layer 92 located in the three-dimensional deformation region 90 are continuous with the portions located outside the three-dimensional deformation region 90 without passing through the slit portions 95 and 96. Therefore, in the existing manufacturing equipment, it is possible to manufacture by simply providing the slit portions 95 and 96 in the first cover layer 91 and the second cover layer 92.

The stretchable structure formed by the slit portions 95 and 96 may be attached with the elastic sheet 93 stretched at the time of manufacture. In that case, in the three-dimensional deformation region 90, as the elastic sheet 93 shrinks to its natural length, the first cover layer 91 and the second cover layer 92 shrink, and the first cover layer 91 and the second cover layer 92 shrink. Shrink wrinkles are formed. Unlike this, it is also possible to integrate the elastic sheet 93 with the first cover layer 91 and the second cover layer 92 in a state where the elastic sheet 93 is not substantially stretched at the time of manufacture. The illustrated example assumes this case, and in the state of natural length, wrinkles (including folds) are not formed in the three-dimensional deformation region 90, and the appearance is good. In particular, by providing only the slit portions 95 and 96 in the first cover layer 91 and the second cover layer 92, the elastic sheet 93 is neatly concealed by the first cover layer 91 and the second cover layer 92 in the state of natural length. There is also the advantage of being done.

The slit portions 95 and 96 may extend not only in the front-rear direction LD and the width direction WD but also in the oblique direction. Further, as long as the slit portions 95 and 96 extend across the three-dimensional deformation region 90 to the edge portion, the slit portions 95 and 96 may be linear as shown in the illustrated example, or may be curved such as an arc or a wavy line. The intersection angle of the two slit portions 95, 96 that intersect each other can be appropriately determined by the size and shape of the three-dimensional deformation region 90 and the arrangement of the slit portions 95, 96, but usually 90 degrees or the intersection angle. When one of them has an acute angle, it can be 15 degrees or more and less than 90 degrees, particularly 30 degrees or more and less than 90 degrees. The dimensions of the three-dimensional deformation region 90 can be appropriately determined, but in the normal case, the front-rear direction dimension Y1 can be within a range of about 2 to 7 mm, and the width direction dimension X1 can be within a range of about 4 to 7 mm. As shown in FIG. 9 (a), the front-rear direction dimension Y1 is longer than the width direction dimension X1, or as shown in FIG. 9 (b), the width direction dimension X1 is longer than the front-rear direction dimension Y1. The directional dimension Y1 and the width directional dimension X1 can be the same. The three-dimensional deformation region 90 preferably does not include the end portion of the article on the peripheral edge, but may include a part thereof. The number of slits 95 and 96 is not limited and may be larger than in the illustrated example.

The arrangement of the plurality of slit portions 95 and 96 is not particularly limited. For example, as in each example shown in FIG. 8, some of a plurality of slit portions 95 (example of FIG. 8A) or all slit portions 95 (slit portions 95 of FIGS. 8B and 8C) are three-dimensionally deformed. It is preferable that both ends extend through the central portion of the region 90 to the edge portion of the three-dimensional deformation region 90. In this case, the slit portion 95 is radial (X-shaped or cross-shaped) from the central portion of the three-dimensional deformation region 90. When the slit portions 95 are arranged so as to extend radially from the central portion of the three-dimensional deformation region 90 in this way, a wide range of three-dimensional deformation is performed with the minimum number of slit portions 95. The region 90 can be formed. Further, the arrangement of the slit portion 95 is suitable when the three-dimensional deformation region 90 is made into a circular shape, an elliptical shape, or a diamond shape.

As shown in the example shown in FIG. 8A, the slit portions 95 and 96 pass through the central portion of the three-dimensional deformation region 90, and both ends extend to the edge portion of the three-dimensional deformation region 90 and the central slit portion 95. It is also preferable to include an end slit portion 96 which passes through the end portion of the central slit portion and whose both ends extend to the edge portion of the three-dimensional deformation region 90. In this case, the slit portions 95 and 96 extend in a T-shape, an H-shape, or the like. Further, the arrangement of the slit portions 95 and 96 is suitable when the three-dimensional deformation region 90 is a triangle or a rectangle. As shown in FIG. 8D, only three or two end slit portions 96 may be provided so as to surround the three-dimensional deformation region 90 in a U-shape or a V-shape.

The slit portions 95 and 96 of the first cover layer 91 and the slit portions 95 and 96 of the second cover layer 92 may have the same dimensions and shapes and be arranged at the same positions (that is, they completely overlap in the thickness direction). It is desirable, but it may be slightly off. Further, the slit portions 95 and 96 of the first cover layer 91 and the slit portions 95 and 96 of the second cover layer 92 may have different dimensions and shapes.

In a tape-type disposable diaper having a side flap portion SF as in this example, the target portion (the target portion in the side flap portion SF of the ventral portion F or inside the WD in the width direction from the connecting tape 13 in the side flap portion SF of the back side portion B ( In the illustrated example, the portion outside the WD in the width direction from the target sheet 20) is a portion in contact with a local and three-dimensional convex portion on the body surface such as the iliac crest and the anterior superior iliac spine. Therefore, as shown in FIG. 9A, it is also possible to provide the three-dimensional deformation region 90 having the slit portions 95 and 96 described above in both of these portions. Further, of course, it may be provided only in one of these parts. Further, as shown in the example shown in FIG. 9B, it is also preferable to provide the end flap portion EF of the dorsal side portion B.

Further, when the waist elastic sheet 70 is attached to the back side portion B as shown in the illustrated example to improve the fit around the waist, it is often difficult to provide the waist elastic sheet 70 close to the connecting tape 13. This is because most tape-type disposable diapers are manufactured so that the front-back LD of the product matches the MD direction (machine direction) on the production line, and the waist elastic sheet 70 is extended in the width direction WD. This is due to the fact that it needs to be installed in a state. However, the portion between the waist elastic sheet 70 and the connecting tape 13 is located at the side flap portion SF and becomes a portion in contact with the iliac crest as described above. Therefore, it is preferable to provide the three-dimensional deformation region 90 having the slit portions 95 and 96 described above in this portion. In the three-dimensional deformation region 90 having the slit portions 95 and 96 described above, the slit portions 95 and 96 are provided in advance on the first cover body and the second cover body, and the elastic sheet 93 is arranged in a substantially non-extended state. Therefore, the three-dimensional deformation region 90 can be formed even at a position that is conventionally difficult to form.

<Others>
The three-dimensional deformation region 90 having the slit portions 95 and 96 in the above example is provided in the side flap portion SF of the tape-type disposable diaper, but it can also be provided in other portions or other types of products. For example, although not shown, the three-dimensional deformation region 90 having the slit portions 95 and 96 described above can be provided on the connecting tape 13 of the tape-type disposable diaper, around the waist of the pants-type disposable diaper, or the like.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-The "front-back direction" means the direction indicated by the symbol LD in the figure (vertical direction), and the "width direction" means the direction indicated by the WD in the figure (horizontal direction), and the front-back direction and the width direction. Are orthogonal.

-"Unfolded state" means a state in which the unfolded state is flat without shrinkage or slack.

-"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.

-"Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt%) Add 1.0 g of highly absorbent polymer to 49.0 g and stir 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 under standard conditions (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to making a sample or test piece constant 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%. A sample having a size of 100 mm × 100 mm is cut out from the test piece in a constant weight state 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 the basis weight.
-The "thickness" of the absorber is the thickness measuring instrument of Ozaki Seisakusho Co., Ltd. (peacock, dial thickness gauge large type, model J-B (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) Measure with the sample and the thickness measuring device horizontal.
-The "thickness" other than the above is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of ^{a load of 0.098 N / cm 2} and a pressurized area of 2 cm ^2.
-"Tensile strength" and "tensile elongation (break elongation)" are based on JIS K7127: 1999 "Plastic-Test method for tensile properties-" except that the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm. It means a value measured with an initial chuck interval (distance between marked lines) of 50 mm and a tensile speed of 300 mm / min. As the tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.

-"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%). To 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 is used for a stretchable structure in all disposable diapers such as tape type disposable diapers as in the above example, various disposable diapers such as pants type and pad type, sanitary napkins, disposable wear articles for swimming and playing in the water, etc. It can be done.

10 ... Leg circumference edge, 11 ... Liquid permeable sheet, 12 ... Exterior non-woven fabric, 13 ... Connecting tape, 13A ... Connecting part, 13B ... Tape body part, 13C ... Tape mounting part, 20 ... Target sheet, 30 ... Top sheet , 40 ... intermediate sheet, 50 ... absorbent element, 56 ... absorber, 58 ... packaging sheet, 60 ... rising gather, 62 ... gather sheet, B ... dorsal part, F ... ventral part, WD ... width direction, LD ... Front-back direction, 70 ... waist elastic sheet, 80 ... waist circumference constituent area, 90 ... three-dimensional deformation area, 93 ... elastic sheet, 91 ... first cover layer, 92 ... second cover layer, 95, 96 ... slit portion, 95 ... Central slit part, 96 ... End slit part, SF ... Side flap part.