JP2021020017A - Expansion structure for disposable wearing article, and underpants type disposable wearing article having the expansion structure - Google Patents

Abstract

To provide an expansion structure expanding in orthogonal two directions excellent in manufacturing easiness.SOLUTION: An expansion structure for a disposable wearing article has a first sheet layer and a second sheet layer overlapped in a thickness direction, and a plurality of expansion hot-melt adhesives 30 arranged between the first sheet layer and the second sheet layer and continuing linearly in a width direction WD. The first sheet layer and the second sheet layer are adhered via the expansion hot-melt adhesive 30. The first sheet layer and the second sheet layer contract in the direction in which the expansion hot-melt adhesive 30 continues and can expand in the direction in which the expansion hot-melt adhesives 30 continue together with the expansion hot-melt adhesives 30. The expansion hot-melt adhesives 30 are provided in a wave shape continuing longer than a wavelength in the width direction WD.SELECTED DRAWING: Figure 9

Description

The present invention relates to a stretchable structure of a disposable wearable article and a pants-type disposable wearable article having this stretchable structure.

In disposable wear articles, it is common to provide an elastic structure in order to improve the fit of each part. For example, in pants-type and tape-type disposable diapers, it is widely practiced to provide a stretchable structure in the waist circumference and a stretchable structure in the leg circumference along the leg circumference. .. Furthermore, not only pants-type and tape-type disposable diapers, but also disposable wear items including sanitary napkins are widely provided with a stretchable structure in the front-rear direction called three-dimensional gathers or flat gathers (for example, patents). Refer to Documents 1 to 3).

A typical elastic structure of such a disposable worn article is one in which an elastic member such as a rubber thread, an elastic film, or a net-like body is provided between the overlapping first sheet layer and the second sheet layer. The first sheet layer and the second sheet layer form a planar stretchable region and play a role of covering and hiding the elastic member, and the elastic member incorporated between the first sheet layer and the second sheet layer is elastically stretchable. It plays a role in creating power for. In the state of being stretched in the expansion / contraction direction, at least the portions located at both ends of the expansion / contraction region of the elastic member are fixed to the first sheet layer and the second sheet layer. By this fixing, the elastic member and the first sheet layer and the second sheet layer are integrated, and the first sheet layer and the second sheet layer are contracted by the contraction force of the elastic member to include folds (wrinkles). It is formed not only in the natural length state but also in the stretched state of the elastic member), and when the elastic member is stretched from this contracted state against the contraction force of the elastic member, the folds are developed. Normally, the first sheet layer and the second sheet layer are in a developed state without folds at the elastic elongation limit, and the folds are closer as the elastic member contracts, and the folds are most densely brought closer in the natural length state. That is, the first sheet layer and the second sheet layer can be expanded and contracted with the increase and decrease of folds.

As described above, the conventional telescopic structure that can be expanded and contracted by increasing or decreasing the folds of the first sheet layer and the second sheet layer has only one that expands and contracts in one direction as a product, but one that expands and contracts in two orthogonal directions. Has also been proposed. It is clear that an elastic structure that expands and contracts in two orthogonal directions provides good fit to a complexly raised body surface, and there is a demand for its realization.

However, the first sheet layer and the second sheet layer have an elastic structure that can be expanded and contracted with the increase and decrease of folds, and when manufacturing a product that expands and contracts in two orthogonal directions, the elastic member is formed in the MD direction and the CD direction of the production line. It needs to be extended to both, and has a problem that it is not easy to manufacture. And this ease of manufacture hinders the realization of commercial products. In addition, when we made a prototype of such an elastic structure that expands and contracts in two orthogonal directions using an elastic film or a mesh-like elastic member, the folds are bumpy when contracted to a certain extent, including the state of natural length. It also has a problem that it does not look and feel good.

Japanese Patent No. 6503489 JP-A-2018-202023 Japanese Unexamined Patent Publication No. 2009-082475 Japanese Unexamined Patent Publication No. 10-88097

Therefore, a main object of the present invention is to provide an elastic structure that expands and contracts in two orthogonal directions, which is excellent in ease of manufacture.

The stretchable structure of the disposable wear article that solves the above problems is as follows.
<First aspect>
A first sheet layer and a second sheet layer overlapping in the thickness direction, and a plurality of stretchable hot melt adhesives arranged linearly in the first direction between the first sheet layer and the second sheet layer. Have,
The first sheet layer and the second sheet layer are bonded via the stretchable hot melt adhesive.
The first sheet layer and the second sheet layer are contracted in the continuous direction of the stretchable hot melt adhesive, and can be expanded and contracted together with the stretchable hot melt adhesive in the continuous direction of the stretchable hot melt adhesive. Yes,
The stretchable hot melt adhesive is provided in a wavy shape that lasts longer than one wavelength in the first direction.
The stretchable structure of disposable wear items.

(Action effect)
In this expansion / contraction structure, since the continuous direction of the expansion / contraction hot melt adhesive that determines the expansion / contraction direction is wavy, not only the first direction component but also the second direction component is inevitably included as the component in the expansion / contraction direction. Therefore, this telescopic structure contracts not only in the first direction but also in the second direction in the state of natural length, and as a result, it becomes possible to expand and contract in all directions by combining the expansion and contraction directions.

Further, in this stretchable structure, in a state of contraction to a certain extent (including a state of natural length), the first sheet layer and the second sheet layer contract in the continuous direction of the stretchable hot melt adhesive and intersect the continuous direction. Folds are formed in the direction of the folds. That is, one or more folds extending in a wavy manner with respect to the wavy stretchable hot melt adhesive are formed so as to overlap with the corresponding wavy stretchable hot melt adhesive (in other words, they are in opposite phase to each other). When you look at the wavy folds and the wavy stretch hot melt adhesive together, it forms a chain). As a result, although it was not initially expected, this telescopic structure has beautiful wavy folds different from the conventional telescopic structure when it is contracted to a certain extent.

Moreover, since this stretchable structure can be manufactured only by making the coating pattern of the stretchable hot melt adhesive wavy, it is extremely easy to manufacture.

The term "wavy" does not matter whether the direction of the wave is linear or curved, and where the center line of the total amplitude (peak-to-peak) passes. is there. In addition, the term "wavy" is a combination of sinusoidal curves and arcs, those whose amplitude and wavelength change in the direction in which the wave continues, and those whose bottom of the wave is sharp (bent) like a cloud shape. Etc., including both regular and irregular shapes.

<Second aspect>
A plurality of the stretchable hot melt adhesives are arranged at intervals in the second direction so as not to intersect each other.
The portion between the stretchable hot melt adhesives adjacent to each other in the second direction is a non-adhesive portion to which the first sheet layer and the second sheet layer are not adhered.
The telescopic structure of the disposable wear article of the first aspect.

(Action effect)
In this telescopic structure, when the non-adhesive portion is contracted to a certain extent, the non-adhesive portion contracts in the first direction and the second direction to form folds. Here, since the non-adhesive portion is continuous in the first direction, the unevenness of the folds formed in the non-adhesive portion is continuous in the first direction without becoming a bump as in the conventional reticulated elastic body. It looks and feels good.

<Third aspect>
Some or all of the stretchable hot melt adhesives have a wavy phase with respect to the other stretchable hot melt adhesives adjacent in the second direction.
The elastic structure of the disposable wear article of the second aspect.

(Action effect)
In this stretchable structure, the folds formed corresponding to the adjacent stretchable hot melt adhesives also have a wavy shape with the same phase. For this reason, the unevenness of the folds is more uniform, and the appearance is particularly excellent. Further, even if the distance between the adjacent stretchable hot melt adhesives in the second direction is close, the folds formed corresponding to each stretchable hot melt adhesive are less likely to interfere with each other, and the shape of the folds is less likely to be irregular. ..

<Fourth aspect>
The total amplitude range of a part or all of the stretchable hot melt adhesive and the total amplitude range of the other stretchable hot melt adhesive adjacent to the second direction partially overlap in the second direction. doing,
The telescopic structure of the disposable wear article of the third aspect.

(Action effect)
As described above, in the expansion / contraction structure of the third aspect, even if the distance between adjacent expansion / contraction hot melt adhesives in the second direction is close, the folds formed corresponding to each expansion / contraction hot melt adhesive interfere with each other. It is hard to do, and the shape of the folds is hard to be irregular. The fourth aspect utilizes the features of the third aspect, and by arranging the stretchable hot melt adhesive particularly close to the second direction, while suppressing the shape of the folds from becoming irregular, It is possible to particularly improve the fit to the convex portion of the body surface.

<Fifth aspect>
Some or all of the stretchable hot melt adhesives are wavy in opposite phase with respect to the other stretchable hot melt adhesives adjacent in the second direction.
The elastic structure of the disposable wear article of the second aspect.

(Action effect)
In this stretchable structure, the folds formed corresponding to the adjacent stretchable hot melt adhesives are also wavy in opposite phase. Here, among the adjacent stretchable hot melt adhesives, the wavy folds corresponding to one stretchable hot melt adhesive and the wavy folds corresponding to the other stretchable hot melt adhesive are aligned in opposite directions, and as a result, they are adjacent to each other. The folds formed between the matching stretchable hot melt adhesives have a generally H-like shape. Therefore, the stretchable structure has an appearance rich in design.

<Sixth aspect>
The total amplitude range of some or all of the stretchable hot melt adhesive and the total amplitude range of the other stretchable hot melt adhesive adjacent to the second direction are separated in the second direction. Yes,
The telescopic structure of the disposable wear article of the second, third, or fifth aspect.

(Action effect)
In this stretchable structure, since the distance between adjacent stretchable hot melt adhesives in the second direction is widely secured, the folds formed corresponding to each stretchable hot melt adhesive are less likely to interfere with each other, and the shape of the folds is not good. It's hard to become a rule.

<7th aspect>
The stretchable hot melt adhesive has a wavy shape in which the inclination angle of the tangent line with respect to the first direction swings between a range of -15 degrees to -60 degrees and a range of +15 degrees to +60 degrees.
The telescopic structure of the disposable wear article according to any one of the first to sixth aspects.

(Action effect)
Since the stretchable hot melt adhesive is continuous in the first direction, the wavy pattern of the stretchable hot melt adhesive is made continuous within the range of this embodiment, that is, without being excessively inclined with respect to the first direction. The stretchable hot melt adhesive can be easily applied at the time of production, and the stretchability is exhibited in a well-balanced manner in both the first direction and the second direction. When the wavy pattern of the stretchable hot melt adhesive has a linear portion such as a triangular wavy shape or a rectangular wavy shape, the tangent line of the linear portion means the linear portion itself.

<8th aspect>
The stretchable hot melt adhesive has a wavy shape in which the inclination angle of the tangent line changes continuously.
The elastic structure of the disposable wear article according to any one of the first to seventh aspects.

(Action effect)
The stretchable hot melt adhesive can be provided in a triangular wavy shape or a rectangular wavy shape as long as it is wavy, but the folds formed on the acute-angled side of the bent portion in a contracted state to some extent are clogged, which deteriorates the aesthetic appearance and the wearing feeling. There is a risk. On the other hand, it is preferable that the stretchable hot melt adhesive has a wavy shape such as a sinusoidal shape in which the inclination angle of the tangent line continuously changes, because such a problem is unlikely to occur.

<Ninth aspect>
The stretchable hot melt adhesive has a total amplitude of 5 to 20 mm and a wavelength of 3 to 5 times the total amplitude.
The elastic structure of the disposable wear article according to any one of the first to eighth aspects.

(Action effect)
The size of the wavy pattern of the stretchable hot melt adhesive is not particularly limited, but it is preferable that the size is within the range of this embodiment because it is particularly excellent in aesthetics and fit.

<10th aspect>
An integrated exterior body extending from the front body to the back body, or an exterior body provided separately on the front body and the back body, and an interior body attached to the middle part in the width direction of the exterior body and covering both front and rear sides of the crotch part. A side seal portion in which both side portions of the exterior body on the front body and both side portions of the exterior body on the rear body are joined, a waist opening and a pair of left and right leg openings are provided.
The exterior body on at least one of the front body and the back body covers a range in the width direction corresponding between the side seal portions in at least a part in the front-rear direction, and is disposable worn in any one of the first to ninth aspects. The stretchable structure of the article is provided so that the stretchable direction of the stretchable region is the width direction.
Pants-type disposable wear items that are characterized by this.

(Action effect)
The above-mentioned elastic structure is suitable for the exterior body of pants-type disposable wear articles.

As described above, according to the present invention, there are advantages such as an elastic structure that expands and contracts in two orthogonal directions, which is excellent in ease of manufacture.

It is a plan view (inner surface side) of the pants type disposable diaper in the unfolded state. It is a plan view (outer surface side) of the pants type disposable diaper in the unfolded state. FIG. 1 is a sectional view taken along the line AA of FIG. It is BB sectional view of FIG. FIG. 5 is a sectional view taken along the line CC of FIG. It is a plan view (outer surface side) of the pants type disposable diaper in the unfolded state. It is a top view which shows various application patterns of a stretchable hot melt adhesive. It is a top view which shows various application patterns of a stretchable hot melt adhesive. It is a top view which shows the change of the expanded state (upper figure) and the contracted state (lower figure). It is a top view which shows the change of the expanded state (upper figure) and the contracted state (lower figure). It is sectional drawing (a) part which has a stretch hot melt adhesive and (b) part which does not have a stretch hot melt adhesive. It is the schematic which shows the application method of a stretchable hot melt adhesive.

Hereinafter, the stretchable structure will be described with reference to an example of a pants-type disposable diaper, which is one of the disposable items. An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The dotted pattern portion in the cross-sectional view shows an 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 coated 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 letterpress method). Can be applied. Alternatively 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. 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.

In addition, the term "stretchable hot melt adhesive" means a hot melt adhesive in which the solidified body exhibits rubber elasticity in the product state (solidified state), whereas the term "hot melt adhesive" is stretchable. Means a common hot melt adhesive that is not used. As the stretchable hot melt adhesive, known ones such as those described in JP-A-10-88097 can be used without particular limitation. Further, as the hot melt adhesive, for example, there are types such as EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type, and the like, but they can be used without particular limitation.

By the way, FIGS. 1 to 5 show an example of a pants-type disposable diaper. This pants-type disposable diaper (hereinafter, also simply referred to as a diaper) has an integrated exterior body 20 extending over the front body F and the back body B, and a crotch portion attached to the middle portion of the exterior body 20 in the width direction WD. It has an interior body 10 covering both front and rear sides of the above. The interior body 10 is formed by interposing an absorber 13 between the liquid-permeable top sheet 11 and the liquid-impermeable sheet 12. For example, in manufacturing, the back surface of the interior body 10 is joined to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot melt adhesive (dot pattern portion in FIG. 2), and then the interior body 10 and the exterior are joined. The body 20 is folded at the center in the front-rear direction (longitudinal direction), which is the boundary between the front body F and the back body B, and both side portions thereof are joined to each other by heat welding or hot melt adhesive to form a side seal portion 21. As a result, a pants-type disposable diaper having a waist opening and a pair of left and right leg openings is formed.

(Interior body)
As shown in FIGS. 4 to 6, the interior body 10 has a structure in which an absorber 13 is interposed between a top sheet 11 made of a non-woven fabric or the like and a liquid-impermeable sheet 12, and the top is formed. This is a portion that absorbs and holds the excrement liquid that has passed through the sheet 11. The planar shape of the interior body 10 is not particularly limited, but it is generally a substantially rectangular shape as shown in the illustrated form.

(Top sheet)
As the top sheet 11 that covers the surface side (skin contact surface side) of the absorber 13, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. The top sheet 11 involves the side edge portion of the absorber 13 and extends to the back side of the absorber 13, but the top sheet 11 is not limited to this.

(Liquid impermeable sheet)
As the liquid-impermeable sheet 12 covering the back side of the absorber 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used, but in recent years, a liquid-impermeable sheet having moisture permeability is preferably used from the viewpoint of preventing stuffiness. This water-impervious / moisture-permeable sheet is a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in the uniaxial or biaxial direction. is there.

The liquid-impermeable sheet 12 of the illustrated example is folded back on both sides of the absorbent body 13 in the width direction WD together with the top sheet 11, but is not limited thereto.

(Absorber)
The absorber 13 is basically a known material, for example, a stack of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and is formed by mixing and fixing a highly absorbent polymer as necessary. Can be used. The absorber 13 can be wrapped with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, in order to retain the shape and polymer.

The overall shape of the absorber 13 is formed in a substantially hourglass shape having a constricted portion 13N narrower than both the front and rear sides in the crotch portion, but it can be an appropriate shape such as a rectangular shape. The size of the constricted portion 13N can be appropriately determined, but the length of the constricted portion 13N in the front-rear direction can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40 of the total width of the absorber 13. It can be about 60%. In the case of having such a constricted portion 13N, if the plane shape of the interior body 10 is substantially rectangular, the portion of the interior body 10 corresponding to the constricted portion 13N of the absorber 13 does not have the absorber 13. A part is formed.

(Three-dimensional gather)
Three-dimensional gather BSs that fit around the legs are formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather BS has a fixed portion fixed to the side portion of the back surface of the interior body, and a side portion of the surface surface of the interior body from the fixed portion via the side of the interior body. A main body that extends to the end, an inverted part that is formed by fixing the front and rear ends of the main body to the side of the surface of the interior body in an inverted state, and a freedom that is formed so that the portion of this inverted portion is not fixed. The portion is formed by a gathered sheet 15 which is made into a double sheet by folding back. As the gather sheet 15, a water-repellent non-woven fabric coated with a silicone-based, paraffin metal-based, alkylchromic chloride-based water repellent, or the like is preferably used.

Further, between the double sheets, an elongated gather elastic member 16 is arranged at the tip of a free portion or the like. As shown by the alternate long and short dash line in FIG. 5, the gather elastic member 16 is for forming a three-dimensional gather BS by erecting a free portion protruding from the side edge portion of the absorber by elastic elastic force.

As the gather elastic member 16, commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used. Further, the gather elastic member 16 is preferably arranged, for example, with a thickness of 925 dtex or less, a tension of 150 to 350%, and an interval of 10.0 mm or less.

(Structural example of exterior body)
The exterior body 20 has a portion constituting the front body F extending from the center in the front-rear direction of the diaper to the ventral side, and a portion constituting the back body B extending from the center in the front-rear direction of the diaper to the dorsal side. .. In the exterior body 20, both side portions of the portion constituting the front body F and both side portions of the portion constituting the rear body B are joined to form the side seal portion 21, so that the wearer's body can be passed through. A waist opening and a pair of left and right leg openings for passing the legs are formed. Although not shown, the exterior body 20 is divided into a front body F and a back body B, and the exterior body 20 of the front body F and the exterior body 20 of the back body B are on the crotch side. A form that is not continuous and is separated can also be adopted.

The exterior body 20 has a waist circumference portion T defined as a front-rear direction range having a side seal portion 21 (a range of front-rear direction LD from the waist opening to the upper end of the leg opening) and a front-rear direction LD of a portion forming the leg opening. It has an intermediate portion L determined by a range (between the region of the front-rear direction LD having the side seal portion 21 of the front body F and the region of the front-rear direction LD having the side seal portion 21 of the rear body B). The waist circumference T can be divided into a waist portion W conceptually forming an edge portion of the waist opening and a waist lower portion U which is a portion below the waist portion W. Normally, when there is a boundary in the waist circumference T where the expansion / contraction characteristics of the WD in the width direction change (for example, the thickness and elongation rate of the elastic elastic member change), the waist portion is located on the waist opening side rather than the boundary on the waist opening side. If there is no such boundary, the waist portion W is on the waist opening side of the absorber 13 or the interior body 10.

As shown in FIGS. 4 to 6, the exterior body 20 has a two-layer structure composed of a pressing sheet 20A made of a non-woven fabric or the like and a back sheet 20B, respectively, and is between the pressing sheet 20A and the back sheet 20B and the back. An elastic member and a stretchable hot melt adhesive are disposed between the folded-back portion 20C formed by folding the sheet 20B inward at the waist opening edge to form a stretchable region. The planar shape of the exterior body 20 has an hourglass-like shape as a whole due to the concave leg circumference lines 29 formed to form leg openings on both sides of the middle.

(Expandable area)
In each of the front body F and the rear body B, the exterior body 20 of the illustrated form has elastic members 24 arranged in the waist portion W, waist lower portion U, and intermediate portion L as elastic members along the width direction WD. It has a stretchable hot melt adhesive 30 arranged. In the portion having the elastic member 24 and the stretchable hot melt adhesive 30, the exterior body 20 contracts in each continuous direction, and the elastic member 24 and the stretchable hot melt adhesive 30 can expand and contract in their continuous directions. (Expandable area). The exterior body 20 is not provided with a so-called leg-surrounding elastic member that is continuous from the side seal portion of the front body F to the side seal portion of the rear body B along the leg circumference line 29.

The waist elastic member 24 is for tightening the wearer's waist with elasticity, and in the illustrated example, an elongated elastic such as a rubber thread attached between layers of the waist portion W in an elongated state along the width direction WD. It is a member, and a plurality of members are provided at intervals in the front-rear direction LD. Further, although the waist elastic member 24 of the illustrated embodiment is sandwiched between the non-woven fabrics of the folded portion 20C of the back sheet 20B at the waist, it may be sandwiched between the pressing sheet 20A and the back sheet 20B. It is desirable that the waist elastic member 24 is provided over the entire width direction WD of the waist W.

The stretchable hot melt adhesive 30 provided on the lower waist portion U is for elastically adhering the diaper to the lower abdomen and buttocks of the wearer. Further, the stretchable hot melt adhesive 30 provided in the intermediate portion L is mainly for imparting stretchability in the width direction to a portion along the leg opening. A plurality of these stretchable hot melt adhesives 30 are linearly continuous in the width direction WD between the layers in the lower waist portion U and the intermediate portion L, and are provided at intervals in the front-rear direction LD.

(Non-stretchable area)
When the expansion / contraction region is provided in the front-rear LD range having the absorber 13, as shown in FIG. 2, the expansion / contraction region may be formed across the absorber 13 over the entire width direction WD of the exterior body 20. , As shown in FIG. 6, in order to prevent the shrinkage of the width direction WD of the absorber 13, the intermediate (preferably inner / outer joint) of the width direction WD including a part or all of the portion overlapping the absorber 13 and the width direction WD. A non-stretchable region (a region having no stretchable hot melt adhesive 30 in the illustrated example) is defined as a non-stretchable region (including the entire portion 201), and both sides of the WD in the width direction thereof are stretchable regions (a region having the stretchable hot melt adhesive 30 in the illustrated example). It may be said. The waist portion W is preferably a stretchable region over the entire width direction WD, but a non-stretchable region may be provided in the middle of the width direction WD as in the waist lower portion U. The non-stretchable region may be formed by a known method of killing the elasticity by cutting the elastic member 24 at one place or a large number of places, or may be formed by not providing the elastic member 24 in the first place. .. Further, when the stretchable hot melt adhesive 30 is used, the non-stretchable region can be formed by not applying the stretchable hot melt adhesive 30. As can be understood from these facts, the provision of the elastic member 24 or the stretchable hot melt adhesive 30 means that a shrinkage portion on which the shrinkage force acts is provided, and the shrinkage force is provided. Does not include the non-contractile part where was killed.

The stretch ratio of the stretchable region can be appropriately determined, and for example, the stretchable region of the waist elastic member 24 can be about 160 to 320%, and the stretchable region of the stretchable hot melt adhesive can be about 160 to 320%.

(Front and rear cover sheets)
As shown in FIGS. 1 and 4, the front cover sheet is used to cover the front and rear ends of the interior body 10 mounted on the inner surface of the exterior body 20 and to prevent leakage from the front and rear edges of the interior body 10. 50 and the rear cover sheet 60 may be provided. Explaining the illustrated form in more detail, the front cover sheet 50 extends over the entire width direction WD from the inner surface of the folded portion 20C of the waist side end portion of the inner surface of the front body F to the position overlapping with the front end portion of the interior body 10. The rear cover sheet 60 extends over the entire width direction WD from the inner surface of the folded portion 20C of the waist side end portion of the inner surface of the rear body B to the position where it overlaps with the rear end portion of the interior body 10. If some non-adhesive parts are provided on the inseam side edges of the front and rear cover sheets 50 and 60 over the entire width direction (may be only the central part), not only the adhesive does not squeeze out, but also this part is slightly removed from the top sheet. It can be floated and function as a leak-proof wall.

When the front and rear cover sheets 50 and 60 are attached as separate bodies as shown in the illustrated form, there is an advantage that the degree of freedom in material selection is increased, but there is also a demerit such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior body 20 to the inner surface of the diaper can be extended to a portion overlapping the interior body 10 to form a portion equivalent to the above-mentioned cover sheets 50 and 60.

(Application pattern of elastic hot melt adhesive)
In the stretchable region formed by the stretchable hot melt adhesive 30, that is, in the case of the illustrated example, the stretchable region of the lower waist portion U and the intermediate portion L, as shown in FIG. 5, the pressing sheet 20A and the back sheet 20B (of these). One of them becomes the first sheet layer and the other becomes the second sheet layer. As in the folded portion 20C, a single sheet forms a first sheet layer and a second sheet layer that overlap in the thickness direction. In some cases), they are adhered via a stretchable hot melt adhesive 30. Further, the pressing sheet 20A and the back sheet 20B are contracted in the continuous direction of the stretchable hot melt adhesive 30, and can be expanded and contracted together with the stretchable hot melt adhesive 30 in the continuous direction of the stretchable hot melt adhesive 30. ..

Characteristically, as shown in FIG. 2 and the like, the stretchable hot melt adhesive 30 is provided in a wavy shape that lasts longer than one wavelength 33 in the width direction WD, for example, in the example shown in FIG. 9 and the example shown in FIG. As shown by the arrows, the expansion / contraction region 30A of the expansion / contraction hot melt adhesive 30 expands / contracts in the width direction WD (first direction) and the front-rear direction LD (second direction), which are orthogonal to each other. There is. That is, when the continuous direction of the expansion / contraction hot melt adhesive 30 that determines the expansion / contraction direction is wavy, not only the component in the width direction WD but also the component in the front-rear direction LD is inevitably included as the component in the expansion / contraction direction. Therefore, this telescopic structure contracts not only in the width direction WD but also in the front-rear direction LD in the state of natural length, and can be expanded and contracted in all directions by combining the expansion and contraction directions. Moreover, since this stretchable structure can be manufactured only by making the coating pattern of the stretchable hot melt adhesive 30 wavy, it is extremely easy to manufacture.

Further, in this telescopic structure, for example, as shown in the lower figure of the example shown in FIG. 9 and FIG. 10, in the state of being contracted to a certain extent (including the state of natural length), the pressing sheet 20A and the back sheet 20B are expanded and contracted hot melt. The adhesive 30 contracts in the continuous direction, and folds 40 (convex portions when viewed from the front of the drawing) are formed in a direction intersecting the continuous direction. A recess 41 (which is a fold 40 when viewed from the opposite side of the drawing) is formed between the fold 40 and the fold 40. That is, one or more folds 40 extending in a wavy manner with respect to the wavy stretchable hot melt adhesive 30 are formed so as to overlap with the corresponding wavy stretchable hot melt adhesive 30 (in other words, in other words). When the wavy folds 40 having opposite phases and the wavy stretchable hot melt adhesive 30 are combined, they form a chain). As a result, although it was not initially expected, this stretchable structure has beautiful wavy folds 40 different from the conventional stretchable structure when it is contracted to a certain extent. Further, the cross section of the folds 40 has a wavy shape so that the pressing sheet 20A and the back sheet 20B are along each other as shown in FIG. FIG. 11A shows a passing position of the stretchable hot melt adhesive 30, and at this position, the pressing sheet 20A and the back sheet 20B are adhered by the stretchable hot melt adhesive 30, so that the folds are tightly packed. It becomes 40 (wrinkles). On the other hand, at the non-passing position of the stretchable hot melt adhesive 30, the folds 40 are larger as shown in FIG. 11B because they are not restricted by the stretchable hot melt adhesive 30.

The wavy pattern of the stretchable hot melt adhesive 30 (the shape of the center line of the stretchable hot melt adhesive 30) is preferably linear in the direction of the wave as shown in the illustrated example, but may be curved. Further, the wavy pattern of the stretchable hot melt adhesive 30 preferably has a straight center line 34 having a total amplitude of 32 (peak to peak) as shown in the illustrated example, but may vary. Typically, the wavy pattern of the stretchable hot melt adhesive 30 is a combination of a sinusoidal curve and an arc as shown in FIG. 7, a rectangular wave shown in FIG. 8 (a), and a rectangular wave shown in FIG. 8 (b). It may be a triangular wave shown. Further, as shown in the illustrated example, the wavy pattern of the stretchable hot melt adhesive 30 can be changed in addition to being constant in the shape, amplitude, and wavelength of the wave in the direction in which the wave continues (that is, a regular wavy pattern). And both irregular wavy patterns). However, when the stretchable hot melt adhesive 30 is provided in a triangular wavy shape or a rectangular wavy shape, the folds 40 formed on the acute-angled side of the bent portion in a state of being contracted to a certain extent may be clogged, which may deteriorate the aesthetic appearance and the wearing feeling. On the other hand, like a sine curve, the stretchable hot melt adhesive 30 has a wavy shape in which the inclination angle of the tangent line (the tangent line of the center line of the stretchable hot melt adhesive 30) continuously changes like a sine wave shape. Is preferable because such a problem is unlikely to occur.

Only one stretchable hot melt adhesive 30 may be provided to form a stretchable region, but a plurality of stretchable hot melt adhesives 30 may be provided as shown in the illustrated example. In this case, it is preferable that the plurality of stretchable hot melt adhesives 30 are arranged at intervals so as not to intersect each other as shown in the illustrated example, but they may be provided so as to intersect each other. Further, as shown in the illustrated example, all the stretchable hot melt adhesives 30 have a wavy pattern having the same size and shape, and some or all of the stretchable hot melt adhesives 30 have at least one of the dimensions and the shape. It can also have a different wavy pattern.

When a plurality of stretchable hot-melt adhesives 30 are arranged at intervals in the front-rear direction LD so as not to intersect each other, the portion between the stretchable hot-melt adhesives 30 adjacent to the front-rear direction LD is the pressing sheet 20A and It is preferable that the back sheet 20B is a non-adhesive portion 31 to which the back sheet 20B is not adhered. That is, in the folds 40 formed on the non-adhesive portion 31, the pressing sheet 20A and the back sheet 20B are not adhered, and each of them can be freely deformed. Further, since the non-adhesive portion is continuous in the width direction WD, the unevenness of the folds 40 formed in the non-adhesive portion 31 is continuous in the width direction WD without becoming a bump like a conventional reticulated elastic body. .. Therefore, the appearance and feel of the folds 40 are particularly good.

When a plurality of stretchable hot melt adhesives 30 are arranged at intervals in the front-rear direction LD, as shown in FIGS. 7 (a) and 7 (b) and FIG. 8 (b), a part or all of the stretchable hot melt adhesive 30 is stretched. It is preferable that the hot melt adhesive 30 has a wavy shape in which the phases are aligned with respect to the other stretchable hot melt adhesive 30 adjacent to the LD in the front-rear direction. In this telescopic structure, as shown in FIG. 9, the folds 40 formed corresponding to the adjacent stretchable hot melt adhesives 30 also have a wavy shape in which the phases are aligned. For this reason, the unevenness of the folds 40 is more uniform, and the folds are particularly aesthetically pleasing. Further, even if the distance between the adjacent stretchable hot melt adhesives 30 in the front-rear LD is close, the folds 40 formed corresponding to the stretchable hot melt adhesives 30 are less likely to interfere with each other, and the shape of the folds 40 is not good. It's hard to become a rule.

In this case, as shown in FIGS. 7 (b) and 8 (b), a range of the total amplitude 32 of a part or all of the stretchable hot melt adhesive 30 and another stretchable hot melt adjacent to the LD in the front-rear direction thereof. It is also preferable that the range of the total amplitude 32 of the adhesive 30 partially overlaps in the front-rear direction LD. The size of the LD in the front-rear direction of this overlapping portion is not particularly limited, but is preferably about 0 to 15 mm. The dimensions of the anterior-posterior LD of this overlapping portion may be the same among all adjacent stretch hot melt adhesives 30, or may differ among some or all adjacent stretch hot melt adhesives 30. As described above, in the present expansion / contraction structure, even if the distance between the adjacent expansion / contraction hot melt adhesives 30 in the front-rear LD is close, the folds 40 formed corresponding to each expansion / contraction hot melt adhesive 30 interfere with each other. It is difficult, and the shape of the folds 40 is unlikely to be irregular. Therefore, by utilizing this feature and arranging the stretchable hot melt adhesive 30 particularly close to the LD in the front-rear direction, the shape of the folds 40 is suppressed to be irregular, and the fit to the convex portion of the body surface is suppressed. Can be especially improved.

When a plurality of stretchable hot melt adhesives 30 are arranged at intervals in the front-rear direction LD, as shown in FIG. 7 (c), some or all of the stretchable hot melt adhesives 30 are arranged in the front-rear direction LD. It is also preferable that the stretchable hot melt adhesive 30 adjacent to the adhesive has a wavy shape in opposite phase with respect to the other stretchable hot melt adhesive 30. In this expansion / contraction structure, as shown in FIG. 10, the folds 40 formed corresponding to the adjacent expansion / contraction hot melt adhesives 30 are also wavy in opposite phase. Here, among the adjacent stretchable hot melt adhesives 30, the wavy folds 40 corresponding to one stretchable hot melt adhesive 30 and the wavy folds 40 corresponding to the other stretchable hot melt adhesive 30 are opposite to each other. As a result, the folds 40 formed between the adjacent stretchable hot melt adhesives 30 have a shape generally similar to H. Therefore, the stretchable structure has an appearance rich in design. It is preferable that the stretchable hot melt adhesives 30 adjacent to each other in the front-rear direction have the same wavy shape except that they are out of phase as shown in the illustrated example, but they are not only out of phase but also have a shape. It may have different wavy shapes (eg, one is sinusoidal and the other is triangular).

As shown in FIGS. 7 (a) and 7 (c) and 8 (a), when a plurality of stretchable hot melt adhesives 30 are arranged at intervals in the front-rear direction LD, some or all of the stretchable hot melt adhesives 30 are arranged. It is also preferable that the range of the total amplitude 32 of the adhesive 30 and the range of the total amplitude 32 of the other stretchable hot melt adhesive 30 adjacent to the front-rear LD are separated in the front-rear LD. In this telescopic structure, as shown in FIG. 9, since the distance between the adjacent stretchable hot melt adhesives 30 in the front-rear direction LD is widely secured, the folds 40 formed corresponding to each stretchable hot melt adhesive 30 are formed. Is less likely to interfere and the shape of the folds 40 is less likely to be irregular. In this case, the distance between the LDs in the front-rear direction in the range of the total amplitude 32 of the adjacent stretchable hot melt adhesives 30 is not particularly limited, but is preferably about 0 to 10 mm. This interval may be the same among all adjacent stretch hot melt adhesives 30, or may differ between some or all adjacent stretch hot melt adhesives 30.

In the stretchable hot melt adhesive 30, the inclination angle θ of the tangent line (tangent to the center line of the stretchable hot melt adhesive 30) with respect to the width direction WD is within the range of more than -60 degrees and less than -90 degrees and more than +60 degrees and less than +90 degrees. When it has a wavy shape that swings and changes within the range, the elasticity of the LD in the front-rear direction becomes significantly higher than the elasticity of the WD in the width direction. On the other hand, the stretchable hot melt adhesive 30 does not have a wavy shape in which the inclination angle θ of the tangent line with respect to the width direction WD swings and changes between a range of -15 degrees to -60 degrees and a range of +15 degrees to +60 degrees. Then, since the stretchable hot melt adhesive 30 is continuous without being excessively inclined with respect to the width direction WD, the stretchable hot melt adhesive 30 can be easily applied at the time of manufacturing, and the width direction WD and the front and rear Stretchability is developed in a well-balanced manner in both directions of the LD. From this point of view, the stretchable hot melt adhesive 30 has a wavy shape in which the inclination angle θ of the tangent line with respect to the width direction WD swings and changes between a range of -40 degrees to -50 degrees and a range of +40 degrees to +50 degrees. Is more preferable.

The size of the wavy pattern of the stretchable hot melt adhesive 30 is not particularly limited, but for example, each stretchable hot melt adhesive 30 has a total amplitude of 32 (total amplitude of the center line of the stretchable hot melt adhesive 30). The wavelength can be about 5 to 30 mm and the wavelength can be about 1 to 5 times the total amplitude. In particular, each stretchable hot melt adhesive 30 has a total amplitude of 32 (total amplitude of the center line of the stretchable hot melt adhesive 30) of 5 to 20 mm (more preferably 5 to 15 mm) and a wavelength of 3 of the total amplitude. It is preferable that the wavy shape is ~ 5 times (more preferably 3.5 to 4.5 times) because it is excellent in aesthetics and fit. Further, in order to expand and contract in a more balanced manner, the continuous length of the expansion / contraction hot melt adhesive 30 in a single expansion / contraction region is preferably two wavelengths or more, and more preferably five wavelengths or more.

The line width 36 (coating width) of one stretchable hot melt adhesive 30 may be appropriately determined, but is usually preferably 0.5 to 4 mm, and particularly preferably 1 to 2 mm.

This stretchable structure can be manufactured by a known method of applying the stretchable hot melt adhesive 30. FIG. 12 is an example of a method for manufacturing this telescopic structure. In this example, before the pressing sheet 20A and the back sheet 20B are sandwiched between the nip rolls 70 and 71 and bonded, the expansion / contraction hot melt adhesive 30 is pressed by the hot melt adhesive coating device 72 to hold the pressing sheet 20A and the back sheet 20B. Apply to at least one facing surface of. At this time, the feed rate of the pressing sheet 20A and the back sheet 20B is made faster than the discharge speed of the expansion / contraction hot melt adhesive 30 by the coating device 72, and the expansion / contraction hot is performed between the coating device 72 and the contact position between the coating device 72 and the sheet to be coated. The melt adhesive 30 is stretched. The degree of elongation determines the degree of elongation in the product, and is the ratio of the feed rate of the pressing sheet 20A and the back sheet 20B to the discharge rate of the stretchable hot melt adhesive 30, and the stretchable hot melt adhesive 30. It can be changed depending on the characteristics such as viscosity.

The continuous direction of the stretchable hot melt adhesive 30 is not particularly limited, but in the case of the above-mentioned manufacturing method, the continuous direction of the stretchable hot melt adhesive 30 and the direction orthogonal to the continuous direction are the MD directions of the manufacturing line (FIG. 12). (See) and the CD direction, and the same applies to the expansion and contraction directions (first direction and second direction). For example, in the exterior body 20 of the pants-type disposable diaper, the width direction WD is in the MD direction, so that the stretchable hot-melt adhesive 30 is preferably provided in a wavy pattern like the pants-type disposable diaper shown in the figure. In the interior body 10 of a pants-type disposable diaper, a tape-type disposable diaper, a pad-type disposable diaper, and a sanitary napkin, the front-rear direction LD is the MD direction, and a wavy pattern in consideration of this is preferable.

The position of the stretchable region by the stretchable hot melt adhesive 30 can be appropriately determined. In the illustrated example, the stretchable region is provided in the lower waist portion U and the intermediate portion L, but all the stretchable regions including the waist portion W are provided in the stretchable hot melt adhesive 30. The waist portion W and the intermediate portion L are formed by an elastic member, and only the waist lower portion U is an elastic region formed by the elastic hot melt adhesive 30, or the waist portion W, the lower waist portion U and the intermediate portion L are formed. It is also possible to provide an expansion / contraction region by the expansion / contraction hot melt adhesive 30 in at least one part and use the remaining portion as the expansion / contraction region by the elastic member.

(Non-woven fabric)
As the non-woven fabric in the above description, a known non-woven 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, even if the constituent fibers of the non-woven fabric are hydrophilic fibers (including hydrophobic fibers made hydrophilic by the hydrophilic agent), they are either hydrophobic fibers or water-repellent fibers (water-repellent fibers made water-repellent by the water-repellent agent). It may be (including aqueous fibers). 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, sheet forming method, fiber bonding method, and 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.

<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 (left-right direction), and the front-back direction and the width direction. Are orthogonal.

-"MD direction" and "CD direction" mean the flow direction (Machine Direction) in the manufacturing equipment and the lateral direction (Cross Direction) orthogonal to this, and one of them is the front-back direction depending on the part of the product. And the other is in the width direction. The MD direction of the non-woven fabric is the direction of fiber orientation of the non-woven fabric. The fiber orientation is the direction along which the fibers of the non-woven fabric follow. For example, the measurement method according to the fiber orientation test method based on the zero-distance tensile strength of the TAPPI standard method T481 or the fibers based on the tensile strength ratio in the anteroposterior direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.

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

-"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% To 49.0 g of the mixture, 1.0 g of the highly absorbent polymer is added, and the mixture is 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 the sample or test piece is pre-dried, it is left in a test room or device under standard conditions (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to maintain a constant amount. 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" 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 .

-The water absorption amount is measured by JIS K7223-1996 "Water absorption amount test method for highly water-absorbent resin".

-The water absorption rate shall be 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. ..

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

-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 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.

The elastic structure of the present invention can be applied not only to pants-type disposable diapers but also to tape-type disposable diapers around the waist and fastening tape, and also includes other types of disposable diapers such as pad-type diapers and sanitary napkins. It can also be applied to other telescopic structures such as three-dimensional gathers and flat gathers, which are widely used in absorbent articles in general.

B ... back body, BS ... three-dimensional gather, F ... front body, L ... middle part, LD ... front-back direction, T ... waist circumference, U ... waist lower part, W ... waist part, WD ... width direction, 10 ... interior Body, 11 ... Top sheet, 12 ... Liquid permeable sheet, 13 ... Absorber, 13N ... Constricted part, 14 ... Packaging sheet, 15 ... Gather sheet, 16 ... Gather elastic member, 20 ... Exterior body, 20A ... Holding sheet , 20B ... back sheet, 20C ... folded part, 21 ... side seal part, 24 ... waist elastic member, 29 ... leg circumference line, 30 ... stretchable hot melt adhesive, 40 ... folds, 41 ... recess.

Claims (10)

A first sheet layer and a second sheet layer overlapping in the thickness direction, and a plurality of stretchable hot melt adhesives arranged linearly in the first direction between the first sheet layer and the second sheet layer. Have,
The first sheet layer and the second sheet layer are bonded via the stretchable hot melt adhesive.
The first sheet layer and the second sheet layer are contracted in the continuous direction of the stretchable hot melt adhesive, and can be expanded and contracted together with the stretchable hot melt adhesive in the continuous direction of the stretchable hot melt adhesive. Yes,
The stretchable hot melt adhesive is provided in a wavy shape that lasts longer than one wavelength in the first direction.
The stretchable structure of disposable wear items. A plurality of the stretchable hot melt adhesives are arranged at intervals in the second direction orthogonal to the first direction so as not to intersect each other.
The portion between the stretchable hot melt adhesives adjacent to each other in the second direction is a non-adhesive portion to which the first sheet layer and the second sheet layer are not adhered.
The telescopic structure of the disposable wearable article according to claim 1. Some or all of the stretchable hot melt adhesives have a wavy phase with respect to the other stretchable hot melt adhesives adjacent in the second direction.
The telescopic structure of the disposable wearable article according to claim 2. The total amplitude range of a part or all of the stretchable hot melt adhesive and the total amplitude range of the other stretchable hot melt adhesive adjacent to the second direction partially overlap in the second direction. doing,
The telescopic structure of the disposable wearable article according to claim 3. Some or all of the stretchable hot melt adhesives are wavy in opposite phase with respect to the other stretchable hot melt adhesives adjacent in the second direction.
The telescopic structure of the disposable wearable article according to claim 2. The total amplitude range of some or all of the stretchable hot melt adhesive and the total amplitude range of the other stretchable hot melt adhesive adjacent to the second direction are separated in the second direction. Yes,
The telescopic structure of the disposable wear article according to claim 2, 3 or 5. The stretchable hot melt adhesive has a wavy shape in which the inclination angle of the tangent line with respect to the first direction swings between a range of -15 degrees to -60 degrees and a range of +15 degrees to +60 degrees.
The stretchable structure of the disposable wear article according to any one of claims 1 to 6. The stretchable hot melt adhesive has a wavy shape in which the inclination angle of the tangent line changes continuously.
The stretchable structure of the disposable wear article according to any one of claims 1 to 7. The stretchable hot melt adhesive has a total amplitude of 5 to 20 mm and a wavelength of 3 to 5 times the total amplitude.
The stretchable structure of the disposable wear article according to any one of claims 1 to 8. An integrated exterior body extending from the front body to the back body, or an exterior body provided separately on the front body and the back body, and an interior body attached to the middle part in the width direction of the exterior body and covering both front and rear sides of the crotch part. A side seal portion in which both side portions of the exterior body on the front body and both side portions of the exterior body on the rear body are joined, a waist opening and a pair of left and right leg openings are provided.
The exterior body in at least one of the front body and the back body covers a width direction range corresponding to the side seal portions in at least a part range in the front-rear direction, according to any one of claims 1 to 9. The stretchable structure of the disposable wearable article is provided so that the stretchable direction of the stretchable area is the width direction.
Pants-type disposable wear items that are characterized by this.

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