WO2019188564A1

WO2019188564A1 - Stretchable structure for disposable wearable article and underpants-type disposable wearable article having stretchable structure

Info

Publication number: WO2019188564A1
Application number: PCT/JP2019/011376
Authority: WO
Inventors: 彩草野
Original assignee: 大王製紙株式会社
Priority date: 2018-03-27
Filing date: 2019-03-19
Publication date: 2019-10-03
Also published as: JP6495505B1; JP2019170555A

Abstract

[Problem] To provide a stretchable structure which has good breathability and flexibility and is less prone to separation at sheet joining parts. [Solution] The problem can be solved by a stretchable structure for a disposable wearable article which has thin and long elastic members 19 disposed at intervals in a perpendicular direction XD between an outer nonwoven fabric layer 12S and an inner nonwoven fabric layer 12H and extending in a stretch direction ED. The outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H have sheet joining parts 70 at which the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined through hot-melt adhesive 19H, 70H applied in a stripe pattern which is substantially linearly continuous in the stretch direction ED. At least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a porous nonwoven fabric, and pores 14 of the stretchable structure are arranged so that groups 90 of pores arranged in a single wave shape continuous in the stretch direction ED are arranged at intervals in the perpendicular direction XD. The distance 90y in the perpendicular direction XD between pores 14 at peak positions in each pore group 90 is greater than the width 70L of the applied hot melt adhesive 19H, 70H.

Description

Stretch structure of disposable wearing article, and pants-type disposable wearing article having this stretchable structure

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

In disposable wearing articles, it is common to provide a stretchable structure in order to improve the fit of each part. For example, in a disposable diaper of a pants type or a tape type, it is widely performed to provide a stretchable structure in the waistline direction at the waistline part or to provide a stretchable structure in a direction along the leg circumference at the leg circumference part. . Furthermore, in addition to pants-type and tape-type disposable diapers, a wide range of disposable wearing articles including sanitary napkins are also widely used to provide longitudinal stretch structures called three-dimensional gathers and flat gathers (for example, patents). Reference 1 to 3).

A typical example of such a stretchable structure for a disposable wearing article is an elongated elastic member provided between the overlapping first nonwoven fabric layer and the second nonwoven fabric layer along the stretch direction and spaced from each other. It is to be prepared. The first non-woven fabric layer and the second non-woven fabric layer form a planar stretchable region and play a role of covering and concealing the elastic member, and the elastic member built in between the first non-woven fabric layer and the second non-woven fabric layer is elastic stretch It plays the role of generating power for The elastic member is fixed in the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends of the stretchable region in the stretched state. By this fixing, the elastic member, the first nonwoven fabric layer, and the second nonwoven fabric layer are integrated, and the first nonwoven fabric layer and the second nonwoven fabric layer are contracted by the contraction force of the elastic member, and include wrinkles (including ridges). When the elastic member is stretched not only in the natural length state but also in a stretched state), and when the elastic member is stretched against the contraction force of the elastic member, the wrinkles are deployed. Usually, the first nonwoven fabric layer and the second nonwoven fabric layer are in a developed state having no wrinkles at the limit of elastic elongation, wrinkles are accompanied with the contraction of the elastic member, and wrinkles are most closely gathered in the natural length state.

In such a stretchable structure, when the first nonwoven fabric layer and the second nonwoven fabric layer are free from each other, one nonwoven fabric layer partially or entirely floats with respect to the other nonwoven fabric layer, thereby causing unnecessary wrinkles and swelling. Since there exists a possibility that it may arise, the 1st nonwoven fabric layer and the 2nd nonwoven fabric layer need to be joined directly or indirectly over the whole. Hereinafter, the joint portion between the first nonwoven fabric layer and the second nonwoven fabric layer is referred to as a sheet joint portion. Moreover, in order to produce elasticity by an elastic member, an elastic member is extended over the whole expansion-contraction direction of an expansion-contraction area | region, and the part located in the both ends of the expansion-contraction direction of an expansion-contraction area | region is a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer In the natural length state, the first nonwoven fabric layer and the second nonwoven fabric layer need to be contracted as the elastic member contracts. That is, it is necessary to join the first nonwoven fabric layer and the second nonwoven fabric layer and to fix the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer.

At present, as a means for fixing the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer, a hot melt adhesive is almost always selected. On the other hand, the bonding between the first nonwoven fabric layer and the second nonwoven fabric layer is often performed by welding such as ultrasonic welding in order to reduce the amount of hot melt adhesive used. It is used persistently. For example, by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive at the passing position of the elastic member, the first nonwoven fabric layer and the second nonwoven fabric layer can be joined. A dual-purpose structure that also serves to fix the elastic member to the nonwoven fabric layer is widely used. In addition, a structure in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined at a sheet joining portion that is intermittently arranged in the stretching direction and continues in a direction orthogonal to the stretching direction (hereinafter also simply referred to as an orthogonal direction), A structure is known in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined at a sheet joining portion that is intermittently arranged in the orthogonal direction at a position between the elastic members in the orthogonal direction and that is substantially continuous in the stretching direction. Yes. (See Patent Documents 1 to 6)

On the other hand, in order to mainly improve air permeability, it has been proposed to provide holes penetrating in the thickness direction in the first nonwoven fabric layer and the second nonwoven fabric layer (see, for example, Patent Documents 7 to 9).

Among these, the ones described in Patent Documents 7 and 8 are bonded to the first nonwoven fabric layer and the second nonwoven fabric layer by an adhesive applied in the form of a spiral or stripe on the entire surface of one nonwoven fabric layer, and the first nonwoven fabric layer. And the elastic member is fixed to the second nonwoven fabric layer. Moreover, the formation of the holes in the first nonwoven fabric layer and the second nonwoven fabric layer is performed by melting, cutting out, or punching before or after joining the first nonwoven fabric layer and the second nonwoven fabric layer.

On the other hand, the one described in Patent Document 9 is formed by welding the joint portions of the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the expansion / contraction direction and the direction orthogonal thereto, and then overlapping the joint portions with holes. To form.

However, in the thing of patent document 7, 8, when the application pattern of an adhesive agent is spiral shape, since the joining of a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer becomes the whole surface, the air permeability in parts other than a hole falls. In addition, there is a risk that flexibility may be reduced (rigidity may be increased).

Moreover, in the thing of patent document 7, 8, when the application | coating pattern of an adhesive is a stripe form, and the structure of patent document 9 WHEREIN: When the sheet | seat junction part is distribute | arranged intermittently in the expansion-contraction direction The portions between the sheet joining portions in the expansion / contraction direction swell in opposite directions to form a wrinkle. However, this stretchable structure is not necessarily sufficiently soft in the natural length state. This can be attributed to the following structural differences. That is, in this stretchable structure, a thin ridge in the stretch direction in a natural length state continues in a direction perpendicular to the stretch direction, and the tip of the fold is bent with a small radius of curvature to form a crease in the material. Since the wrinkles having the same height are closely arranged at the same height, the wrinkles are not easily crushed in the thickness direction and are not easily collapsed. Moreover, if the tip of the heel is bent with a small radius of curvature, a particularly hard feel is felt when the tip is touched.

On the other hand, a stretchable structure having sheet joint portions that are intermittently arranged in the orthogonal direction and substantially continuous in the stretchable direction, such as the above-described dual-use structure, is flexible in the natural length state. Has characteristics. This can be attributed to the following structural differences. In other words, when the sheet joining portions are substantially continuous in the expansion and contraction direction, the first nonwoven fabric layer and the second nonwoven fabric layer can be deformed only along each other at each sheet joining portion. As a result, the first nonwoven fabric layer and the second nonwoven fabric layer are aligned with each other in a state where the first nonwoven fabric layer and the second nonwoven fabric layer are contracted in accordance with the contraction of the elastic member, including the natural length state, in the sheet bonding portion and the vicinity thereof. A wrinkle is formed on both the front and back surfaces in a wavy shape. In addition, under this influence, the first nonwoven fabric layer and the second nonwoven fabric generally follow the shapes of the first nonwoven fabric layer and the second nonwoven fabric layer in the sheet joining portion also in the region between adjacent sheet joining portions. Corrugations are formed on both the front and back surfaces of the layers so as to be wavy. And in such a wrinkle, not only the rigidity improvement only by the number of nonwoven fabric layers but also a gentle bending (particularly a natural length state) due to the hardness of the sheet joint and the difference in curvature between the first nonwoven fabric layer and the second nonwoven fabric layer As a result, the touch is smooth, it is easy to be crushed in the thickness direction, and the flexibility of the touch is improved.

However, when the sheet joint part substantially continuous in the expansion and contraction direction is formed with an adhesive, there are the following problems. That is, in this case, since it is difficult to accurately match the position of the adhesive and the position of the holes, there is a possibility that some of the adhesive lines overlap with a large number of holes arranged at intervals in the expansion / contraction direction. is there. And when there exists an overlap with such an application line of an adhesive agent and many holes, naturally the 1st nonwoven fabric layer and the 2nd nonwoven fabric layer are not pasted up in the portion which overlaps with a hole among the application lines of an adhesive agent. In other words, the sheet bonding portion formed at a position that overlaps a large number of holes not only reduces the bonding area, but also loses the position overlapping the holes and becomes dotted, or has a concave missing portion at the edge of the bonding portion. Will be formed. Therefore, there is a possibility that the sheet bonded portion in which the missing portion is generated easily peels due to a decrease in the bonded area. In particular, if the number of holes arranged in a straight line with an interval in the expansion / contraction direction is large, the number of missing parts is inevitably increased. Further, such peeling of the adhesive portion is not preferable because the appearance of the wrinkle is remarkably deteriorated due to the collapse of a part or the whole of the wrinkle.

In particular, when the sheet joint portions are intermittently arranged in the orthogonal direction, stress concentrates on the edge of the sheet joint portion when the first nonwoven fabric layer and the second nonwoven fabric layer can be freely deformed in the region between the adjacent sheet joint portions. For reasons such as being easy, the bonded portion may be more easily peeled off than simply reducing the area of the sheet bonding portion.

JP 2004-229857 A JP 2013-132331 A JP 2014-209773 A Japanese Unexamined Patent Publication No. 2017-064126 Japanese Unexamined Patent Publication No. 2017-064133 JP 2017-164034 A Japanese Patent Laying-Open No. 2015-107223 Japanese Patent Laid-Open No. 2015-128573 Japanese Patent Laying-Open No. 2015-192862

Therefore, a main problem of the present invention is to provide a stretchable structure for a disposable worn article that is excellent in air permeability and flexibility, and less likely to peel off the sheet joint portion.

The stretchable structure of the disposable wearing article that has solved the above problems is as follows.
<First aspect>
Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joining portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined via a hot melt adhesive,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The hot melt adhesive is applied in a striped pattern that is spaced in the orthogonal direction and substantially linearly continuous in the stretch direction,
The arrangement of the holes in the stretchable structure is a group of holes arranged in a single wavy shape or chain shape following the stretch direction, and arranged at intervals in the orthogonal direction.
The gap between the holes at both peak positions in the group of holes in the orthogonal direction is equal to or larger than the application width of the hot melt adhesive;
A stretchable structure for a disposable wearing article.

(Function and effect)
In this stretchable structure, the sheet-bonded portion by the hot melt adhesive is formed in a striped pattern spaced in the orthogonal direction orthogonal to the expansion / contraction direction and continuous in the orthogonal direction. Can be secured.

In addition, the arrangement of the holes in the stretchable structure is such that a group of holes arranged in a single wavy shape or a double wavy shape whose peaks are opposite to each other in the stretch direction are arranged at intervals in the orthogonal direction. And the interval in the orthogonal direction of the holes at both peak positions in the group of holes (when the total amplitude changes, the peak positions of both peaks and valleys with the minimum total amplitude) is the application width of the hot melt adhesive. (Dimension in the orthogonal direction of the coating line. Equal to the maximum dimension in the orthogonal direction of the sheet joint portion). Since the group of holes is wavy like this embodiment, even if a part of the application position of the hot melt adhesive lined up at intervals in the orthogonal direction passes through the group of holes, the number of intersecting holes is small. There will be fewer and non-intersecting holes. As a result, the area of the missing part in the sheet joining part is small and sparse, so that it is difficult to peel off.

In addition, "the arrangement | sequence of the hole in an elastic structure" means the arrangement | sequence which match | combined all the holes in a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer. Therefore, for example, when only one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric, it matches the arrangement of the holes in the perforated nonwoven fabric, but both the first nonwoven fabric layer and the second nonwoven fabric layer. In the case of a perforated nonwoven fabric, even if the arrangement of the holes of each nonwoven fabric layer does not satisfy the conditions of this embodiment, the arrangement of all the holes of both nonwoven fabric layers only needs to satisfy the conditions of this embodiment.
Moreover, as described in Patent Document 4, the hot melt adhesive or the like is “substantially continuous in the stretching direction”, as described in Patent Document 4, at least in a direction perpendicular to the stretching direction (the first nonwoven fabric in the unfolded state). Means continuous (continuous without interruption) when viewed from the direction parallel to the layer and the second non-woven fabric layer and perpendicular to the elastic member), so long as the hot melt adhesive or the like continues in the stretch direction (first 1 non-woven fabric layer and second non-woven fabric layer are joined continuously in the stretching direction), hot melt adhesive etc. are intermittently arranged in the stretching direction (first nonwoven fabric layer and second nonwoven fabric layer) Is also included in the form of being intermittently joined in the expansion and contraction direction.

<Second aspect>
The interval in the orthogonal direction of the holes at both peak positions in the hole group is 1.0 to 6.0 times the application width of the hot melt adhesive.
The expansion-contraction structure of the disposable wearing article of a 1st aspect.

(Function and effect)
The interval in the orthogonal direction between the holes at both peak positions in the group of holes can be determined as appropriate, but it is particularly preferably 1.0 to 6.0 times the application width of the hot melt adhesive.

<Third Aspect>
The sheet joint is formed by a hot melt adhesive disposed in a portion overlapping the elastic member.
The elastic structure of the disposable wearing article of the 1st or 2nd aspect.

(Function and effect)
Such a sheet joint portion can be manufactured by sandwiching an elastic member coated with a hot melt adhesive between the first nonwoven fabric layer and the second nonwoven fabric layer, and is widely used in the field of disposable wearing articles. Yes. However, in this structure of the sheet joint portion, in principle, the force tends to concentrate on the sheet joint portion. That is, it is a structure in which peeling of the above-described sheet joint is likely to be a problem. However, in this aspect, since the group of holes is wavy as described above, even if a part of the application position of the hot melt adhesive lined up at intervals in the orthogonal direction passes through the group of holes, they intersect. As a result of the decrease in the number of holes and the occurrence of non-intersecting holes, the sheet joint is less likely to be peeled off.

<Fourth aspect>
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The diameter of the hole in the perforated nonwoven fabric decreases as it goes from the opposite side to the opposing nonwoven layer side to the opposing nonwoven layer side,
The elastic structure of the disposable wearing article according to any one of the first to third aspects.

(Function and effect)
The arrangement of the holes in the stretchable structure is such that the rows of holes arranged at intervals in the orthogonal direction are arranged at intervals in the stretch direction, and the first nonwoven fabric layer and the second nonwoven fabric layer are arranged along the rows of holes. It becomes easy to bend. As a result, it becomes easy to form a series of wrinkles in which the holes are broken. The ridges are less likely to branch or the valleys are partially widened, and as a whole, well-organized ridges extending along the row of holes are easily formed.
In particular, as in this embodiment, when the diameter of the hole decreases from the opposite side of the opposing nonwoven fabric layer side toward the opposing nonwoven fabric layer side, the surface opposite to the opposing nonwoven fabric layer is valley-folded. So easy to break. Therefore, the kite is more neatly arranged. In addition, in the heel formed by the stretch structure of this aspect, a row of holes is positioned at the bottom between the heel and the heel, and in the natural length, the holes are hidden between the heel and the heel. In the extended state, the hole is exposed. This change not only improves air permeability, but also brings about the advantage that it is easy to appeal to the user that the product is excellent in air permeability due to the change in appearance.
The diameter of the hole means a dimension in a direction that passes through the center of gravity of the hole and is orthogonal to the expansion / contraction direction (therefore, the diameter is a circle in the case of an ellipse, and the major axis is an ellipse).

<Fifth aspect>
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The hole has a dimension in the expansion / contraction direction of 0.3 to 3.0 mm and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
The orthogonal spacing of the holes in the array of holes is 1.0 to 5.0 mm;
The distance between the holes in the group of holes is 2.5 to 10.0 mm;
An interval between the sheet joints in the orthogonal direction is 5 to 10 mm;
The dimension of the sheet joint portion in the orthogonal direction is 0.5 to 5.0 mm. The elastic structure of the disposable wearing article according to any one of the first to fourth aspects.

(Function and effect)
Although arrangement | positioning of a hole and a sheet | seat junction part can be determined suitably, it is preferable to be in the range of this aspect.

<Sixth aspect>
In the group of holes, the interval in the expansion / contraction direction of the holes is 1.0 to 10.0 times the dimension in the expansion / contraction direction of the holes.
The elastic structure of the disposable wearing article according to any one of the first to fifth aspects.

(Function and effect)
In the group of holes, when the interval between the expansion and contraction directions of the holes is 1.0 times or less of the dimension in the expansion and contraction direction of the holes, the holes are densely arranged in the expansion and contraction direction, so that the air permeability is particularly high. And even if the holes are densely arranged in the expansion / contraction direction in this way, the hot melt adhesive lined up at intervals in the orthogonal direction because the group of holes is wavy as described above Even if a part of the coating position passes through the group of holes, the number of intersecting holes is reduced and non-intersecting holes are generated. As a result, the sheet joint portion is not easily peeled off.

<Seventh aspect>
Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the skin side of the wearer is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the porous nonwoven fabric,
The elastic structure of the disposable wearing article according to any one of the first to sixth aspects.

(Function and effect)
By making the nonwoven fabric layer on the skin side a non-porous nonwoven fabric, it is possible to eliminate the influence of the pores on the touch. Moreover, since only one of the first nonwoven fabric layer and the second nonwoven fabric layer has a hole, the skin is not exposed at the time of wearing, and leakage through the hole can be prevented. In particular, when the perforated nonwoven fabric is of the fourth embodiment, the wrinkles formed on the skin-side nonwoven fabric layer are thin wrinkles, and the wrinkles formed on the opposite nonwoven fabric layer are thick wrinkles that are gently bent. Therefore, since the contact area between the skin-side nonwoven fabric layer and the skin is small and the gap between the heel and the heel increases, the air permeability is particularly excellent. The opposite side of the ridge is unlikely to be deformed to impair the beauty such as falling down, and has excellent shape stability.
<Eighth aspect>
Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joint portion to which the first nonwoven fabric layer and the second nonwoven fabric layer are welded,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The welding is performed in a striped pattern that is spaced in the orthogonal direction and that is linearly continuous in the orthogonal direction;
The arrangement of the holes in the stretchable structure is such that a group of holes arranged in a single wavy shape or a double wavy shape with opposite peaks in the stretch direction are arranged at intervals in the orthogonal direction. ,
The distance between the orthogonal positions of the holes at both peak positions in the hole group is larger than the dimension in the orthogonal direction of the welded portion;
A stretchable structure for a disposable wearing article.

(Function and effect)
This aspect is different from the first aspect in that the sheet bonding portion is formed by welding, but the other aspects are the same as those of the first aspect, including the effects.

<Ninth aspect>
An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part A side seal part in which both sides of the outer body of the front body and both sides of the outer body of the back body are joined, a waist opening and a pair of left and right leg openings,
The exterior body in at least one of the front body and the back body has a stretchable structure according to any one of the first to eighth aspects over at least a width direction range corresponding to the space between the side seal portions in a partial range in the front-rear direction. Is provided so that the expansion / contraction direction of the expansion / contraction region is the width direction,
A pants-type disposable wearing article characterized by that.

(Function and effect)
The above-described stretchable structure is suitable for an exterior body of a pants-type disposable wearing article.

According to the present invention, there are advantages such as ensuring good air permeability and flexibility and reducing the possibility of peeling of the sheet joint portion.

It is a top view which shows the inner surface of the underpants type disposable diaper of an expansion | deployment state. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 1. (A) 4-4 sectional view of FIG. 1, and (b) 5-5 sectional view of FIG. It is a perspective view (hole omitted) of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body of a unfolded state with the outline of an exterior body. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. (A) 4-4 sectional view of FIG. 8 and (b) 5-5 sectional view of FIG. It is a top view which shows the example of arrangement | sequence of a hole. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) 6-6 cross-sectional view of FIG. 11, (b) 7-7 cross-sectional view of FIG. 11, and (c) a cross-section in a contracted state of a portion passing through the first hole row and the second hole row. FIG. 3D is a cross-sectional view of a contracted state of a portion passing only through the first hole row. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) 6-6 cross-sectional view of FIG. 13, (b) 7-7 cross-sectional view of FIG. 13, and (c) a contracted state of a portion passing through the first hole row and the second hole row. It is sectional drawing and (d) It is sectional drawing of the contracted state of the part which passes only a 1st hole row | line | column. (A) Cross-sectional view in the orthogonal direction in the expanded state, (b) Cross-sectional view in the expansion / contraction direction in the expanded state, and (c) Cross-sectional view in the contracted state of the portion passing through the first hole row and the second hole row (D) It is sectional drawing of the contracted state of the part which passes only a 1st hole row | line | column. It is an expanded sectional view of a perforated nonwoven fabric. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) Front view showing the outer surface of the exterior body in the natural length state, (b) Front view showing the inner surface of the exterior body in the natural length state, (c) Front view showing the outer surface of the exterior body in a state of being stretched to some extent. It is. It is a top view which shows the example of arrangement | sequence of a hole.

Hereinafter, an example of a pants-type disposable diaper 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. Hot melt adhesives can be applied by known methods such as slot coating, continuous line or dotted line bead coating, spiral coating, Z coating, etc., or pattern coating (transfer of hot melt adhesive in relief printing). Can be applied. Instead of or together with this, at the fixing portion of the elastic member, the hot melt adhesive can be applied to the outer peripheral surface of the elastic member, and the elastic member can be fixed to the adjacent member. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

The pants-type disposable diaper shown in FIGS. 1 to 6 includes a front exterior body 12F constituting the front body F, a rear exterior body 12B constituting the rear body B, and a rear exterior body from the front exterior body 12F through the crotch portion. An interior body 200 provided inside the

exterior bodies

12F and 12B so as to extend to the body 12B. Both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal portion 12A. As a result, the openings formed by the front and rear end portions of the

exterior bodies

12F and 12B become the waist openings WO through which the wearer's torso passes, and the lower edges of the

exterior bodies

12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the

exterior bodies

12F and 12B are portions that support the interior body 200 with respect to the wearer's body. The symbol Y in the figure indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X in the unfolded state. The full width of the diaper is shown.

The pants-type disposable diaper includes a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a portion that forms the leg opening LO. An intermediate region L defined as a front-rear direction range (between a front-rear direction region having the side seal portion 12A of the front body F and a front-rear direction region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where the waist region WO has a boundary where the stretching stress in the width direction WD changes (for example, the thickness of the elastic member or the elongation rate changes), the waist opening WO side is more waist-like than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Inner / outer joint)
The fixing of the inner body 200 to the

outer bodies

12F and 12B is not particularly limited, and can be performed by, for example, a hot melt adhesive. In the illustrated example, the inner surface of the

exterior body

12F, 12B is applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 in this case and the hot melt adhesive applied to the root portion 65 of the rising gather 60. Is fixed. The inner / outer joint part 201 that fixes the inner body 200 and the

outer bodies

12F and 12B can be provided in almost the entire region where both overlap, for example, the inner body 200 may be provided in a portion excluding both ends in the width direction. it can.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a rising gather 60 that extends from both sides of the interior body 200 so as to contact the legs of the wearer in order to prevent excrement from leaking to both sides of the interior body 200.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured 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 spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

The both sides of the top sheet 30 may be folded back to the back side at the side edge of the absorbent element 50, or may be projected to the side from the side edge of the absorbent element 50 without being folded back.

The top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional deviation with respect to the back side member. desirable. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond nonwoven fabric, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably 20 ~ 80g / m ^2, more preferably 25 ~ 60g / m ^2. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent body 56, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

The intermediate sheet 40 may be fixed to a member adjacent to the back side by a bonding means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional displacement with respect to the back side member. desirable. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot melt adhesive applied to the back surface thereof.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. The liquid-impermeable sheet 11 is preferably made of a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as coating with a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 so that the side of the top sheet 30 of the absorbent element 50 It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on the left and right.

(Get up gather)
The rising gather 60 is for preventing side leakage, extends across the entire front-rear direction LD along both side portions of the interior body 200, and stands up from the side of the interior body 200 to the front side. The rising gather 60 in the illustrated example is such that the base side portion rises obliquely toward the center in the width direction, and the tip side portion rises obliquely outward in the width direction from the intermediate portion, but is not limited thereto. However, it is possible to make appropriate changes such as a configuration in which the whole stands up in the center in the width direction.

More specifically, the rising gather 60 in the illustrated example folds the belt-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD at the tip portion and folded in two. In addition to overlapping, a plurality of elongated gather elastic members 63 are fixed along the longitudinal direction and spaced apart in the width direction WD between the folded portion and the sheet in the vicinity thereof. The base end portion (the end portion on the side opposite to the sheet folding portion in the width direction WD) of the rising gather 60 opposite to the front end portion is fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the interior body 200. A portion 65 other than the root portion 65 is a main body portion 66 (a portion on the folded portion side) extending from the root portion 65. The main body portion 66 includes a root side portion extending toward the center in the width direction and a tip side portion that is folded back at the tip of the root side portion and extends outward in the width direction. This form is a surface contact type rising gather 60, but a line contact type rising gather 60 that is not folded outward in the width direction can also be used. And while the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed. The gather elastic member 63 along the front-rear direction LD is fixed in an extended state to at least the tip of the free portion 68.

In the rising gather 60 configured as described above, the contraction force of the gather elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends of the main body portion 66 are fixed so as not to stand up. On the other hand, since there is a non-fixed free portion 68 between them, only the free portion 68 stands up so as to abut on the body side as indicated by an arrow in FIG. In particular, when the root portion 65 is positioned on the back side of the interior body 200, the free portion 68 stands up so as to open outward in the width direction at and around the crotch portion, so that the rising gather 60 abuts on the surface around the legs. As a result, the fit is improved.

(Absorption element)
Although the absorption element 50 is not specifically limited, In this example, it has the absorber 56 and the packaging sheet 58 which wraps this absorber 56 whole. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

The absorber 56 may be rectangular, but as shown in FIG. 7, the absorber 56 includes a front end portion, a rear end portion, and a constricted portion 56 N that is located between these and narrower than the front end portion and the rear end portion. The hourglass shape is preferred because the fit of the absorber 56 and the rising gather 60 around the legs is improved.

Further, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. . Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of disposable diaper can be used as they are.

The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m ² .

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
The

exterior bodies

12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD (exterior two-split type). This separation distance 12d can be, for example, about 40 to 60% of the total length Y. Moreover, as shown in FIG.8 and FIG.9, the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B (exterior integral type).

In the exterior two-divided type pants-type disposable diaper, since the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200. The cover nonwoven fabric 20 covering the back surface of the interior body 200 is preferably provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200. The material of the cover nonwoven fabric 20 is not particularly limited. For example, the same material as the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H of the outer package 12 (a porous nonwoven fabric layer or a nonporous nonwoven fabric layer described later) may be used. . The front-rear direction range of the cover nonwoven fabric 20 is not particularly limited as long as it has portions overlapping the front exterior body 12F and the rear exterior body 12B, and extends in the front-rear direction LD over the entire front end to rear end of the interior body 200. As shown in FIG. 7, the intermediate position in the front-rear direction of the region where the rear exterior body 12B and the interior body 200 overlap from the front-rear direction intermediate position of the region where the front exterior body 12F and the interior body 200 overlap. It may extend in the front-rear direction LD.

The

exterior bodies

12F and 12B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion C that extends from the waist region T to the intermediate region L side. is doing. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. Further, in the illustrated example, the lower edge of the collar cover portion C is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F. It can also be a curve that becomes.

As shown in FIGS. 2 to 5, the

exterior bodies

12F and 12B are formed with the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. Needless to say, either the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H corresponds to the first nonwoven fabric layer of the present invention, and the other corresponds to the second nonwoven fabric layer of the present invention. As shown in FIG. 5, the nonwoven fabric layer 12H is formed by folding one sheet material so that the crease is positioned on the waist opening side, and bonding two sheet materials together as shown in FIG. It can also be formed. Further, the innermost portion 12r of these sheet materials can be extended to the end of the interior body 200 on the waist opening WO side (see the example in FIG. 9). Further, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be formed of a sheet material that is partially different from the other portions.

As constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (including single-component fibers and composite fibers such as core sheaths) In addition, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and the like can be selected without particular limitation, and these can also be used as a mixture. In order to increase the flexibility of the

nonwoven fabric layers

12S and 12H, it is preferable that the constituent fibers are crimped fibers. Further, the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be hydrophilic fibers (including hydrophobic fibers made hydrophilic by a hydrophilizing agent) or hydrophobic fibers or water repellent fibers (water repellent fibers). (Including water-repellent fibers made water-repellent by an agent). Nonwoven fabrics are generally short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punches, depending on fiber length, sheet formation method, fiber bonding method, and laminated structure. It is classified as non-woven fabric, point bond non-woven fabric, laminated non-woven fabric (SMS non-woven fabric with a melt-blown layer sandwiched between spunbond layers, SMMS non-woven fabric, etc.). Can do.

The fineness and basis weight of the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H can be determined as appropriate, but in the normal case, they are preferably about 1.8 to 6.0 dtex and about 10 to 30 g / m ² , respectively.

(About perforated nonwoven fabric)
As shown in FIGS. 2, 8, 11, and 12, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a perforated nonwoven fabric in which holes 14 penetrating in the thickness direction are scattered. As shown in FIGS. 11 and 12, when the inner nonwoven fabric layer 12H on the skin side of the wearer is a non-porous nonwoven fabric and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, the influence on the touch of the holes 14 is eliminated. Can do. Moreover, since the hole 14 is provided in only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. Although not shown, the inner nonwoven fabric layer 12H on the skin side of the wearer may be a perforated nonwoven fabric, and the outer nonwoven fabric layer 12S may be a nonporous nonwoven fabric. As shown in FIG.13 and FIG.14, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap. It may be a structure. In this case, higher air permeability can be obtained by making both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H porous. Moreover, since the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. As shown in FIG. 15, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric are completely or partially. May overlap. In addition, although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, in most cases (for example, an area of 50% or more), the holes 14 of one perforated nonwoven fabric and the other perforated nonwoven fabric are formed. Although the hole 14 of the porous nonwoven fabric does not overlap, in some cases, the hole 14 of one porous nonwoven fabric and the hole 14 of the other porous nonwoven fabric may overlap.

The planar shape (opening shape) of each hole 14 can be determined as appropriate. The hole 14 has a long hole shape as shown in FIG. 10 (b), a true circle shape as shown in FIG. 10 (e), an elliptic shape as shown in FIGS. 10 (a), (d) and (f). Any shape such as a polygon such as a triangle, a rectangle, and a rhombus, a star, and a cloud can be used. As shown in FIG. 10 (c), holes having different shapes may be mixed, but in that case, it is preferable that the dimensions in the expansion / contraction direction are substantially the same, and that all the holes have a single shape. preferable. The dimension of each hole 14 is not particularly limited, but the dimension 14L in the orthogonal direction XD (the dimension of the longest part) is preferably 0.3 to 5.0 mm, particularly preferably 0.6 to 2.0 mm. The ED dimension (longest part dimension) 14W is preferably 0.3 to 3.0 mm, particularly preferably 0.4 to 1.5 mm. When the shape of the hole 14 is a long shape in one direction such as a long hole shape, an ellipse shape, a rectangular shape, a rhombus shape, etc. (a shape in which the total length in one direction is longer than the total length in the direction perpendicular thereto), the dimension in the longitudinal direction The (longest dimension) is preferably 1.2 to 2.5 times the dimension (longest dimension) in the direction perpendicular thereto. Moreover, when the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.

The area and area ratio of each hole 14 may be determined as appropriate, but the area is preferably about 0.1 to 2.7 mm ² (particularly 0.1 to 1.0 mm ² ). It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).

The planar arrangement of the holes 14 in one perforated nonwoven fabric is not particularly limited. Thus, for example, although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H have at least one of the size, shape, and arrangement of the holes 14. May be different.

On the other hand, an arrangement in which all the holes 14 in the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are combined (that is, when all the holes 14 are projected on a plane) is as shown in FIGS. 10 (a) to 10 (d). In addition, a group of holes 90 arranged in a single wavy shape following the expansion / contraction direction ED are arranged at intervals in the orthogonal direction XD, and spaced apart so as to form a chain shape following the expansion / contraction direction ED. The group of holes 90 arranged side by side can be arranged at intervals in the orthogonal direction XD. The group 90 of holes arranged in a chain is not particularly limited as long as the portion where the holes 14 are arranged in a ring is repeated with an interval in the expansion / contraction direction ED. For example, as shown in FIG. The group of holes 90 arranged so as to form a heavy wavy shape can be arranged at intervals in the orthogonal direction XD, or can be a chain as shown in FIG. Here, “the group of holes 90 are arranged at intervals in the orthogonal direction XD” means that the non-hole portion 92 that continues straight along the expansion / contraction direction ED between the group of holes 90 adjacent in the orthogonal direction XD. It means having.

The arrangement shape in the hole group 90 can be determined as long as it is the above-mentioned wave shape, and the arcuate curve peaks and valleys as shown in FIG. 10 (a) repeatedly follow a wave shape, or triangles as shown in FIG. 10 (b). In addition to a regular shape such as a wave shape, a rectangular wave shape as shown in FIG. 10 (d), a sinusoidal shape like the group of holes 90 in the middle of FIG. 10 (f), at least one of amplitude and wavelength is not shown. Can be a regular or irregularly changing shape, or any other irregular shape.

The interval 14x in the expansion / contraction direction ED of the holes 14 in the hole group 90 may be constant or may be changed and can be determined as appropriate. Considering the improvement in air permeability due to the holes 14, it is desirable that the thickness be in the range of 2.0 to 10 mm, particularly 3.0 to 5.0 mm.

Further, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are easily bent along the row 91 of holes. Therefore, in the arrangement of the holes 14 in the stretchable structure, as shown in the examples shown in FIGS. 10A, 10B, and 10D, the row of holes 91 arranged at intervals in the orthogonal direction XD is spaced from the stretch direction ED. If the holes are lined up, a series of ridges 80 (to be described later) such that the holes 14 are broken are easily formed. As a result, the ridges 80 are less likely to branch or the valleys are partially widened, and as a whole, the well-organized ridges 80 extending along the row of holes 91 are easily formed. This tendency becomes stronger when the row 91 of holes is provided in at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, as in the example shown in FIG. 10D, the interval 14y in the orthogonal direction XD of the holes 14 in each hole row 91 changes as in the example shown in FIGS. 10A and 10B. If it is constant, it is preferable because the ridges 80 are more easily arranged. In this case, the interval 14y in the orthogonal direction XD of the holes 14 in the hole row 91 is preferably in the range of 0.9 to 8.0 mm, particularly 1.0 to 3.0 mm. In addition, the interval 14y in the orthogonal direction XD of the holes 14 in the hole row 91 may be longer than or equal to the interval 14x in the expansion / contraction direction ED of the holes 14 in the hole group 90, but short (2 to 2). It is desirable that it is about 5 times.

The cross-sectional shape of the hole 14 is not particularly limited. For example, as shown in FIGS. 16 (a) to 16 (c), the hole 14 may be a punching type hole whose periphery is formed by a cut end of a fiber as shown in FIG. 16 (d). 14 may be a non-punched hole 14 (the edge has a high fiber density) formed by having almost no cut ends of the fiber at the periphery of 14 and a pin inserted between the fibers and spread. As shown in FIG. 16D, the punching type hole may be smaller as the diameter of the hole 14 goes to the middle in the thickness direction, or smaller as it goes to the one side in the thickness direction. .

The non-punched hole 14 is such that the diameter of the hole 14 decreases from the pin insertion side toward the opposite side. This includes a case where the diameter of the hole 14 continues to decrease over the entire thickness direction of the nonwoven fabric layer, and a case where the decrease in the diameter of the hole 14 almost disappears in the middle of the thickness direction. In such a non-punched hole, as shown in FIGS. 16 (a) and 16 (c), a fiber is pushed out to the edge of the hole 14 on the side opposite to the pin insertion side and pushed out to the side opposite to the pin insertion side. The part (burr) 14e is formed, and the protrusion 14e is not formed on the pin insertion side, and the fiber is inserted into the edge of the hole 14 on the side opposite to the pin insertion side as shown in FIG. The protrusion 14e pushed out to the opposite side is formed, and the pin insertion side includes the protrusion 14e formed by pushing out the fiber to the pin insertion side. Further, in the former type of hole 14, the protrusion 14 e has a substantially uniform height 14 h as shown in FIG. 16A, and the protrusion 14 e as shown in FIG. This includes a facing portion having the highest protruding height 14i and a facing portion facing in a direction perpendicular to the protruding portion and having the lowest protruding height 14j. Although it is desirable that the protruding portion 14e has a cylindrical shape continuously in the circumferential direction of the hole, the protruding portion 14e of a part or all of the holes 14 is formed only in a part of the circumferential direction of the hole 14. Also good. The projecting

heights

14h, 14i, and 14j (apparent height when no pressure is measured using an optical microscope) is preferably about 0.2 to 1.2 mm. The highest protrusion height 14i in the protrusion 14e is preferably about 1.1 to 1.4 times the lowest protrusion height 14j. The protruding height of the protruding portion 14 e may change in the circumferential direction of the hole 14.

For example, when a hole 14 having a long shape in one direction as shown in FIGS. 10A, 10B, and 10D is formed by inserting a pin, fibers at the edge of the hole 14 are retracted outward or vertically. A protruding portion (burr) 14e is formed in which the protruding height i of the opposing portion in the longitudinal direction of the hole 14 is higher than the protruding height j of the opposing portion in the direction orthogonal to the longitudinal direction. The protruding portion 14e of the hole 14 may have a fiber density that is lower than that of the surrounding portion, but is preferably the same or higher.

The fineness, basis weight and thickness of the constituent fibers of the perforated nonwoven fabric can be determined as appropriate, but in the usual case, about 1.8 to 6.0 dtex, about 15 to 25 g / m ^{2 and} about 0.1 to 1.3 mm, respectively. Is preferable. Further, the bending resistance in the MD direction (width direction) of the perforated nonwoven fabric is preferably 35 to 100 mm, particularly 40 to 70 mm in a non-porous state before drilling, and 10 to 50 mm in the state after drilling. In particular, the thickness is preferably 15 to 40 mm.

(Elastic area)
In the

exterior bodies

12F and 12B, an elongated elastic member 19 is provided between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, and an expansion / contraction region A2 is formed that elastically expands and contracts in the width direction WD as the elastic member 19 expands and contracts. ing. That is, in the stretchable region A2, in the natural length state, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are contracted with the contraction of the elastic member and have a large number of wrinkles 80. Further, when the stretchable region A2 is extended in the width direction WD, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are extended to a predetermined extension rate that can be extended without wrinkles 80. The elastic member 19 can be used in any shape, e.g., a thread shape, a string shape, and a belt shape, as long as it is elongated. The elastic member 19 may be made of synthetic rubber or natural rubber.

The elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at least at both ends in the stretching direction ED in the stretchable region A2. The fixing means for the elastic member 19 is not particularly limited, but it is preferable to use the hot melt adhesive 19H. For example, as shown in FIG. 17, after the hot melt adhesive 19H is intermittently applied to the outer peripheral surfaces of both ends of the elastic member 19 in the expansion / contraction direction ED by an application means such as a comb gun or a sure wrap nozzle, the elastic member 19 can be sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H via the hot melt adhesive 19H only at both ends in the stretching direction ED in the stretchable region. As shown in FIGS. 11 and 13, after hot melt adhesive is continuously applied to the outer peripheral surface of the elastic member 19 by an application means such as a comb gun or a shure wrap nozzle, the elastic member 19 is applied to the outer nonwoven fabric layer 12S and the inner side. It can also be sandwiched between the nonwoven fabric layers 12H. In this case, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the longitudinal direction as well as both ends of the stretching direction ED in the stretchable region A2 at the arrangement site. Other than that, although not shown in the drawing, after applying a hot melt adhesive to the arrangement positions of both ends of the elastic member 19 in the expansion / contraction direction ED on at least one facing surface of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, The elastic member 19 can also be sandwiched between the layer 12S and the inner nonwoven fabric layer 12H. In this case, the hot melt adhesive may be continuous in the orthogonal direction XD or may be intermittently disposed in the orthogonal direction XD. Further, in these cases, the continuous portion of the hot melt adhesive may extend over a plurality of elastic members.

In the case of a pants-type disposable diaper such as the illustrated example, it is desirable to provide the elastic member 19, that is, the stretchable region at the following site. That is, a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist portion W of the

exterior bodies

12F and 12B. Attached. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic members 17, you may overlap with the interior body 200 or the width direction center which overlaps with the interior body 200 You may provide each in the width direction both sides except a part. The waist elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 4 is preferably provided about 3 to 22 present at intervals of ~ 12 mm, which by extension ratio in the width direction WD of the waist portion W 150 to 400% especially about 220-320% Preferably there is. Further, the waist portion W does not need to use the same thickness waist portion elastic member 17 in all of the front-rear direction LD or have the same elongation rate. The thickness and elongation rate may be different.

Further, a plurality of waist lower part elastic members 15 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist lower part U of the

exterior bodies

12F and 12B. It has been.

The waist lower elastic member 15 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 1 ~ 15mm, especially 3 to is preferably provided about 5 to 30 yarns at intervals of 8 mm, which by 200 to 350% elongation modulus in the width direction WD of the waist lower portion U, especially It is preferably about 240 to 300%.

Further, a plurality of cover elastic members 16 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the buttock cover portion C of the rear exterior body 12B. ing.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1.0 mm. ^It is preferable to provide about 2 to 10 thread rubbers with an interval of 5 to 40 mm, particularly 5 to 20 mm, and the extension ratio of the cover portion in the width direction WD is 150 to 300%, particularly 180 to 260. % Is preferred.

When providing an inguinal cover portion on the front exterior body 12F, a cover portion elastic member can be similarly provided.

(Non-stretchable area)
When the

elastic members

15 and 16 are provided in the front-rear direction range having the absorber 56 like the lower waist portion U and the buttock cover portion C in the illustrated example, a part or all of the

elastic members

15 and 16 in the width direction WD of the absorber 56. In order to prevent shrinkage, the intermediate in the width direction (preferably including the entire inner / outer joint portion 201) including part or all of the portion overlapping the absorber 56 and the width direction WD is defined as the non-stretchable region A1, and the width direction Both sides are taken as the stretchable area A2. The waist portion W is preferably the stretchable region A2 over the entire width direction WD, but similarly to the waist lower portion U, a non-stretchable region A1 may be provided in the middle in the width direction.

The stretchable region A2 and the non-stretchable region A1 supply the

elastic members

15 and 16 between the inner nonwoven fabric layer 12H and the outer nonwoven fabric layer 12S, and the

elastic members

15 and 16 are at least both ends in the stretchable direction ED in the stretchable region A2. In the region that becomes the non-stretchable region A1, the

elastic members

15 and 16 are pressed and applied at one place in the middle of the width direction in the region that becomes the non-stretchable region A1. It can be constructed by cutting by heating, or by cutting almost the entire

elastic members

15 and 16 finely by pressurization and heating, leaving the stretchability in the stretchable region A2 and killing the stretchability in the non-stretchable region A1. . In the former case, as shown in FIG. 4, the non-stretchable region A1 has an outer nonwoven fabric in a state in which the uncut stretched region A2 is continuously cut from the

elastic members

15 and 16 of the stretchable region A2 to the natural length alone as the unnecessary elastic member 18. In the latter case, it remains between the layer 12S and the inner nonwoven fabric layer 12H. Although not shown in the drawing, the cut residue continuous from the

elastic members

15 and 16 in the elastic region A2 and the

elastic members

15 and 16 in both elastic regions A2 are continuous. The cut piece of the elastic member that is not left is left between the outer nonwoven fabric layer 12 S and the inner nonwoven fabric layer 12 H in a state where the cut piece of the elastic member is contracted to the natural length alone as an unnecessary elastic member.

(Junction structure of outer nonwoven fabric layer and inner nonwoven fabric layer)
As shown in FIGS. 11 and 12, the stretchable region A2 has a sheet joining portion 70 in which the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via a hot melt adhesive 19H. The agent 19H is applied in a striped pattern that is spaced substantially in the orthogonal direction XD and substantially linearly continuous in the expansion / contraction direction ED. As a result, since the sheet joining portion 70 is formed at an interval in at least the orthogonal direction XD orthogonal to the expansion / contraction direction ED, good air permeability and flexibility can be ensured. In addition, when the sheet joint portions are substantially continuous in the expansion / contraction direction, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are integrated in each sheet joint portion so that they can be deformed only along each other. As a result, in the sheet bonding portion 70 and the vicinity thereof, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are in contact with each other in a state where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are contracted as the elastic member contracts, including the natural length state. The wrinkles 80 are formed on both the front and back surfaces in a corrugated shape. Further, under this influence, in the region between the adjacent sheet bonding portions 70 as well, the shape of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the sheet bonding portion 70 is generally followed in FIG. As shown, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are wavy so that they are along each other, and ridges 80 are formed on both front and back surfaces. Such a ridge 80 bends gently due to the difference in the hardness of the sheet bonding portion 70 and the curvature of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, as well as the improvement in rigidity due to the number of nonwoven fabric layers. As a result, the touch is smooth and is easily crushed in the thickness direction, and the touch flexibility is improved. The sheet bonding portion 70 may be continuous over the entire expansion / contraction direction ED of the expansion / contraction region A2, but may be continuous only in a part of the range where the plurality of ridges 80 are formed.

Characteristically, the hole group 90 is arranged in a wave shape as described above, and both peak positions in the hole group 90 (a cycle in which the total amplitude is minimum when the total amplitude changes). The gap 90y in the orthogonal direction XD of the holes 14 at the peak positions of both the peaks and valleys of the sheet is equal to the application width of the hot melt adhesive 19H (the dimension in the orthogonal direction XD of the coating line. .) It ’s bigger. As a result, even if a part of the application position of the hot melt adhesive 19H arranged at intervals in the orthogonal direction XD passes through the group of holes 90, the number of the holes 14 intersecting with the hot melt adhesive 19H is reduced and crossed. No holes 14 will be produced. As a result, the area of the missing portion in the sheet joining portion 70 is small and sparse, so that it is difficult to peel off.

Since the hole group 90 is densely arranged in the expansion / contraction direction ED when the interval 14x in the expansion / contraction direction ED of the hole 14 is about 2 to 5 times the dimension 14W of the expansion / contraction direction ED of the hole 14, Highly breathable. Even when the holes 14 are densely arranged in the expansion / contraction direction ED as described above, the hole group 90 has a wave shape as described above, so that the holes 14 are arranged at intervals in the orthogonal direction XD. Even if a part of the application position of the hot melt adhesive 19H passes through the group of holes 90, the number of holes 14 that intersect with each other is reduced, and as a result, non-intersecting holes 14 are generated. It becomes difficult to become. The interval 90y in the orthogonal direction XD of the holes 14 at both peak positions in the hole group 90 can be determined as appropriate, but is particularly preferably 1 to 6 times the application width of the hot melt adhesive 19H.

Further, the arrangement of the holes 14 in the stretchable structure is such that the row 91 of holes arranged at intervals in the orthogonal direction XD is arranged at intervals in the stretch direction ED, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are It becomes easy to bend along the row 91 of holes. As a result, a continuous ridge 80 in which the hole 14 becomes a fold is easily formed. That is, it is difficult for the ridges 80 to branch or the valleys to be partially widened, and as a whole, the well-formed ridges 80 extending along the rows of the holes 14 are easily formed.

If the interval 91 y in the orthogonal direction XD of the holes 14 in the hole row 91 is narrower than the interval 70 y in the orthogonal direction XD of the sheet bonding portion 70, one or more holes 14 exist in the region between the adjacent sheet bonding portions 70. Therefore, it is preferable. For example, if the interval 91 y in the orthogonal direction XD of the holes 14 in the row of holes 14 is 1/6 or more and less than 1/2 of the interval 70 y in the orthogonal direction XD of the sheet bonding portions 70, Since two or more holes 14 exist in all of the regions, a series of ridges 80 in which the holes 14 are broken are more easily formed. Therefore, it becomes easy to form the collar 80 further arranged. Further, since the group of holes 90 is wavy, even if the above condition is not satisfied, one or more holes 14 are present in a region between adjacent sheet joining portions 70 to some extent. For example, in the example illustrated in FIG. 2, in the waist portion W, the interval 91 y in the orthogonal direction XD of the holes 14 in the first hole row is longer than the interval in the orthogonal direction XD of the waist elastic member 19. Is formed by the hot melt adhesive 19 H disposed at a portion overlapping the elastic member 19, the above condition is not satisfied, but the above condition is satisfied except for the waist portion W. Of course, it is desirable that all of the expansion / contraction regions A2 satisfy the size relationship of the intervals 91y and 70y, but it is not necessary that all of the expansion / contraction regions A2 satisfy the size relationship of 91y and 70y as in this example.

The sheet bonding portion 70 is not particularly limited as long as it is formed in a striped pattern that is spaced in the orthogonal direction XD and substantially continuous in the expansion / contraction direction ED. For example, as in the example illustrated in FIGS. 11 and 13, the sheet joining portion 70 may be formed only by the hot melt adhesive 19 H disposed in a portion overlapping the elastic member 19. Such a sheet joint portion 70 can be manufactured by sandwiching the elastic member 19 coated with the hot melt adhesive 19H between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, and is widely used in the field of disposable wearing articles. It is used. However, in the structure of the sheet joining portion 70, in principle, the force tends to concentrate on the sheet joining portion. That is, it is a structure in which peeling of the above-described sheet bonding portion 70 is likely to be a problem. However, if the hole group 90 has a wave shape as described above, even if a part of the application position of the

hot melt adhesives

19H and 70H arranged at intervals in the orthogonal direction XD passes through the hole group 90, As a result, the number of intersecting holes 14 is reduced, and holes 14 that do not intersect are also generated. As a result, the sheet bonding portion 70 is not easily peeled off.

As shown in FIG. 17 instead of (or with) the hot melt adhesive 19H disposed in a portion overlapping with the elastic member 19, a stretch direction is formed in a region located between the elastic members 19 adjacent to each other in the orthogonal direction XD. The sheet joint portion 70 can also be formed by applying the hot melt adhesive 70H in a pattern that is substantially continuous with the ED. In addition, it goes without saying that the hot melt adhesive 19H for fixing both ends of the elastic member 19 may join the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H.

The dimension 70L of the sheet bonding portion 70 in the orthogonal direction XD can be determined as appropriate, but is preferably short, and is preferably 0.2 to 0.6 times the space 19y between adjacent elastic members 19 in the orthogonal direction XD, particularly 0.3. It is preferable that the ratio is 0.5 times.

As described above, the cross-sectional structure of the hole 14 is not particularly limited, but the diameter of the hole 14 is the non-woven fabric layer side facing from the opposite side of the facing non-woven fabric layer side (for example, in the example shown in FIGS. 11 and 12). If it becomes smaller as it goes from the outer side of the outer nonwoven fabric layer 12S to the inner side), it is easy to bend so that the opposite surface of the nonwoven fabric layer is valley-folded, as in the example shown in FIGS. Therefore, when such a cross-sectional shape of the holes is combined with a perforated nonwoven fabric having an array of holes 14 in which the rows 91 of holes arranged at intervals in the orthogonal direction XD are arranged at intervals in the expansion / contraction direction ED, Will be more neatly arranged. In addition, in the ridge 80 formed in this case, the row of holes 14 is positioned at the bottom between the ridges, and as shown in FIG. The hole 14 is exposed as shown in FIG. 18C in a state where it is hidden between the ridges but extended during use. This change not only improves air permeability, but also brings about the advantage that it is easy to appeal to the user that the product is excellent in air permeability due to the change in appearance. Furthermore, some of the sheet bonding portions 70 may be arranged so as to pass through the holes 14, but in that case, if the sheet bonding portions 70 are formed by the hot melt adhesive 19 H, the hot bonding from the holes 14 may be performed. The melt adhesive 19H is exposed. However, when the row of holes 14 is located at the bottom between the ridges, there is an advantage that the hot melt adhesive 19H exposed from the holes 14 is difficult to touch the skin.

In particular, when the inner nonwoven fabric layer 12H on the skin side of the wearer is a nonporous nonwoven fabric and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, the diameter of the holes 14 of the porous nonwoven fabric is opposite to the opposing nonwoven fabric layer side. When it becomes small as it goes to the opposing nonwoven fabric layer side from the side, as shown in FIG.12 (c) and FIG.18 (b), the wrinkle 80 formed in the inner side nonwoven fabric layer 12H turns into a thin wrinkle, and an outer side nonwoven fabric layer The ridges 80 formed in 12S are thick folds that bend gently. Accordingly, the contact area between the inner nonwoven fabric layer 12H and the skin is small, and the gap between the heel and the heel increases, so that the air permeability is particularly excellent. The ridges 80 of the outer nonwoven fabric layer 12S are less likely to be deformed to impair the beauty such as falling down, and have excellent shape stability.

In addition, the specific dimensions and arrangement of the holes 14 and the sheet bonding portion 70 can be determined as appropriate, but the arrangement of the holes 14 is such that the row of holes 91 arranged at intervals in the orthogonal direction XD is spaced from the expansion / contraction direction ED. In the case where they are lined up, it is particularly preferable that they are within the following ranges.
Dimension 14W of expansion / contraction direction ED of hole 14: 0.3 to 3.0 mm (particularly 0.4 to 1.5 mm)
Dimension 14L in the orthogonal direction XD of the hole 14: 0.3 to 5.0 mm (especially 0.6 to 2.0 mm)
Interval 91y in the orthogonal direction XD of the holes 14 in the hole row 91: 1.0 to 5.0 mm (particularly 1.0 to 3.0 mm)
Spacing 14D of hole expansion / contraction direction ED in the group of holes 90: 2.5 to 10.0 mm (particularly 3.0 to 6.0 mm)
Spacing between sheet joints 70 in the orthogonal direction XD: 5 to 10 mm (especially 5.0 to 7.0 mm)
Dimension 70L of sheet joint 70 in orthogonal direction XD: 0.5 to 5.0 mm (especially 1.0 to 3.0 mm)

Although the hole 14 and the sheet | seat junction part 70 can also be provided only in the expansion-contraction area | region A2, as shown in the example shown in FIG.8 and FIG.9, it can be provided over a wider area | region including the non-expandable area | region A1.

The sheet joining portion 70 in the above example is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via the

hot melt adhesives

19H and 70H, but the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are welded. It may be a part. That is, at the time of forming the sheet bonding portion 70, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be welded in a striped pattern spaced in the orthogonal direction XD and continuous in the orthogonal direction XD. In this case, the elastic member 19, the outer nonwoven fabric layer 12S, and the inner nonwoven fabric layer 12H may be welded or not welded at the passing position of the elastic member 19. In any case, in order to weld the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H with the elastic member 19 interposed, the melted portions of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer. At least one of 12H is continuous in the orthogonal direction XD.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

“Front-rear direction” means the direction (vertical direction) indicated by LD in the figure, “width direction” means the direction indicated by WD (left-right direction) in the figure, and the front-rear direction and the width direction are It is orthogonal.
-"MD direction" and "CD direction" mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular thereto, and either one is the front-rear direction, and the other Is the width direction. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, It can be discriminated by a simple measuring method for determining the orientation direction.

∙ “Center” for a closed planar shape means the center of gravity in the case of a figure that does not have a center.

・ "Front side" means the person near the wearer's skin when wearing a pants-type disposable diaper, and "Back" means the person far from the wearer's skin when wearing a pants-type disposable diaper .

・ "Surface" means the surface closer to the wearer's skin when wearing a pants-type disposable diaper, and "Back" refers to the skin of the wearer when wearing a pants-type disposable diaper. It means the far side.

-“Area ratio” means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (for example, holes) in the target region (for example, non-woven fabric) by the area of the target region. is there. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio. For example, the area ratio of the holes can be measured by the following procedure using, for example, a trade name VHX-1000 of KEYENCE Corporation, with the measurement condition set to 20 times.
(1) Set on a 20x lens and adjust the focus. The position of the nonwoven fabric is adjusted so that the holes are 4 × 6.
(2) Specify the brightness of the hole area and measure the area of the hole.
(3) Click the “Area measurement” color extraction in “Measurement / Comments”. Click on the hole.
(4) Click “Batch measurement”, check “Display measurement result window”, and save as CSV data.

・ "Elongation rate" means a value when the natural length is 100%. For example, an expansion rate of 200% is synonymous with an expansion 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% 1.0 g of a superabsorbent polymer is added to 49.0 g of the mixture) and stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

· “Weighing” is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated and used as the basis weight.

“Thickness” is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

・ Water absorption is measured according to JIS K7223-1996 “Test method for water absorption of superabsorbent resin”.

-The water absorption rate is the "time to end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

・ “Bending softness” means “8.21.1 A method (45 ° cantilever method)” of JIS L 1096: 2010 “Fabric and knitted fabric testing method”. When the non-porous nonwoven fabric before punching is not available, the value of the porous nonwoven fabric before punching (non-porous nonwoven fabric) is the same as the non-porous nonwoven fabric (fiber composition, fineness, basis weight, thickness, etc.). Prepare and measure.

・ "Unfolded state" means a state of being flattened without contraction or slack.

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

・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard state (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

The present invention can be used for general disposable wearing articles such as pants-type disposable diapers and tape-type disposable diapers, pad-type disposable diapers, disposable swimwear, diaper covers, sanitary napkins and the like.

DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner nonwoven fabric layer, 12S ... Outer nonwoven fabric layer, 14 ... Hole, 14e ... Projection, 18 ... unnecessary elastic member, 19 ... elastic member, 19H, 70H ... hot melt adhesive, 20 ... cover nonwoven fabric, 200 ... interior body, 201 ... inner / outer joint, 30 ... top sheet, 40 ... intermediate sheet, 50 DESCRIPTION OF SYMBOLS ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gathering gather, 62 ... Gathered non-woven fabric, A1 ... Non-stretchable region, A2 ... Stretchable region, C ... Gutter cover part, L ... Middle region, LD ... Front-back direction , LO ... leg opening, T ... waist circumference region, U ... waist lower part, W ... waist part, WD ... width direction, WO ... waist opening, 70 ... sheet joint part, XD ... orthogonal direction, ED ... stretching method , 80 ... folds, 90 ... hole group 91 ... rows of apertures, 92 ... imperforate portion.

Claims

Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joining portion in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined via a hot melt adhesive,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The hot melt adhesive is applied in a striped pattern that is spaced in the orthogonal direction and substantially linearly continuous in the stretch direction,
The arrangement of the holes in the stretchable structure is a group of holes arranged in a single wavy shape or chain shape following the stretch direction, and arranged at intervals in the orthogonal direction.
The gap between the holes at both peak positions in the group of holes in the orthogonal direction is equal to or larger than the application width of the hot melt adhesive;
A stretchable structure for a disposable wearing article.
The interval in the orthogonal direction of the holes at both peak positions in the hole group is 1.0 to 6.0 times the application width of the hot melt adhesive.
The elastic structure of the disposable wearing article according to claim 1.
The sheet joint is formed by a hot melt adhesive disposed in a portion overlapping the elastic member.
The elastic structure of the disposable wearing article according to claim 1 or 2.
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The diameter of the hole in the perforated nonwoven fabric decreases as it goes from the opposite side to the opposing nonwoven layer side to the opposing nonwoven layer side,
The elastic structure of the disposable wearing article according to any one of claims 1 to 3.
The array of holes is an array of holes arranged at intervals in the orthogonal direction, and arranged at intervals in the expansion and contraction direction,
The hole has a dimension in the expansion / contraction direction of 0.3 to 3.0 mm and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
The orthogonal spacing of the holes in the array of holes is 1.0 to 5.0 mm;
The distance between the holes in the group of holes is 2.5 to 10.0 mm;
An interval between the sheet joints in the orthogonal direction is 5 to 10 mm;
The elastic structure of the disposable wearing article according to any one of claims 1 to 4, wherein the dimension of the sheet joint portion in the orthogonal direction is 0.5 to 5.0 mm.
In the group of holes, the interval in the expansion / contraction direction of the holes is 1.0 to 10.0 times the dimension in the expansion / contraction direction of the holes.
The elastic structure of the disposable wearing article according to any one of claims 1 to 5.
Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the skin side of the wearer is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the porous nonwoven fabric,
The elastic structure of the disposable wearing article according to any one of claims 1 to 6.
Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joint portion to which the first nonwoven fabric layer and the second nonwoven fabric layer are welded,
At least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
In the elastic structure of disposable wearing articles,
The welding is performed in a striped pattern that is spaced in the orthogonal direction and that is linearly continuous in the orthogonal direction;
The arrangement of the holes in the stretchable structure is such that a group of holes arranged in a single wavy shape or a double wavy shape with opposite peaks in the stretch direction are arranged at intervals in the orthogonal direction. ,
The distance between the orthogonal positions of the holes at both peak positions in the hole group is larger than the dimension in the orthogonal direction of the welded portion;
A stretchable structure for a disposable wearing article.
An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part A side seal part in which both sides of the outer body of the front body and both sides of the outer body of the back body are joined, a waist opening and a pair of left and right leg openings,
The exterior body in at least one of the front body and the back body covers at least a width direction range corresponding to the space between the side seal portions in a partial range in the front-rear direction. Equipped with a stretchable structure so that the stretchable direction of the stretchable region is the width direction,
A pants-type disposable wearing article characterized by that.