JP7149984B2 - LAMINATED NONWOVEN FABRIC AND ABSORBENT ARTICLES - Google Patents

Description

The present disclosure relates to laminated nonwoven fabrics and absorbent articles comprising the laminated nonwoven fabrics.

A laminated nonwoven fabric is known in which a plurality of elastic members are arranged in a stretched state between two nonwoven fabrics to give elasticity. The laminated nonwoven fabric can be used, for example, as a gather member of a disposable diaper.

For example, Patent Literature 1 discloses the following wearing article.
A crotch region having a chassis, side panels and fasteners, wherein the chassis has longitudinal and lateral directions perpendicular to each other, and is interposed between a front waist region, a rear waist region and both waist regions in the longitudinal direction. and from side edges of one of the front and rear waist regions of the chassis, the side panels extend in the lateral direction, and the side panels are non-extensible in the lateral direction. A disposable wearable article having a fastener extending therefrom and repetitively connecting the waist regions through the side panels by use of the fastener,
In the side panel, an elastic region is formed between the chassis and the fastener so that elastic expansion and contraction in the lateral direction can be repeated. The outer surface side is formed of nonwoven fabric,
In the elastic region, a hot-melt adhesive is applied to the nonwoven fabric on the inner surface side with a width of 1 to 5 mm, and a plurality of band-shaped application portions extending in the front-rear direction are spaced apart from each other by 1 to 5 mm. By arranging in the horizontal direction, an application area of the hot-melt adhesive is formed, and a plurality of elastic members extending in parallel with each other in the horizontal direction extend to the non-woven fabric through the hot-melt adhesive in the application area. wherein the elastic member is contracted to form a plurality of gathers extending in the front-rear direction on the nonwoven fabric on the inner surface side.

JP 2014-4334 A

In the wearing article described in Patent Document 1, in the elastic region, a plurality of belt-like application portions that are applied to the nonwoven fabric with a width of 1 to 5 mm and extend in the front-rear direction are spaced apart from each other by 1 to 5 mm in the lateral direction. Since the hot-melt adhesive application areas are aligned, the adhesiveness between the elastic member and the non-woven fabric is excellent, but there is room for improvement in breathability due to the hot-melt adhesive application areas.
Accordingly, an object of the present disclosure is to provide a laminated nonwoven fabric that is excellent in adhesiveness and breathability.

The present disclosure discloses a laminated nonwoven fabric for absorbent articles having a first direction, a second direction and a thickness direction orthogonal to each other and stretchable in the first direction, the laminated nonwoven fabric comprising: In the thickness direction, it comprises a first nonwoven fabric, a second nonwoven fabric, and an elastic member disposed between the first nonwoven fabric and the second nonwoven fabric, wherein at least one of the first nonwoven fabric and the second nonwoven fabric A non-uniform basis weight nonwoven fabric having an alternating structure in a first direction in which high basis weight portions and low basis weight portions having a lower basis weight than the high basis weight portions alternate, wherein the elastic member is a first A laminated nonwoven fabric has been found which is characterized by being bonded to a nonwoven fabric and a second nonwoven fabric with an adhesive.

The laminated nonwoven fabric of the present disclosure is excellent in adhesiveness and breathability.

FIG. 1 is a diagram for explaining a laminated nonwoven fabric 1 according to the first embodiment. FIG. 2 is a diagram for explaining the laminated nonwoven fabric 1 according to the first embodiment. FIG. 3 is a diagram for explaining the laminated nonwoven fabric 1 according to the first embodiment. FIG. 4 is a diagram for explaining the laminated nonwoven fabric 1 according to the first embodiment. FIG. 5 is a diagram for explaining the laminated nonwoven fabric 1 according to the second embodiment. FIG. 6 is a diagram for explaining the laminated nonwoven fabric 1 according to the second embodiment. FIG. 7 is a diagram for explaining the laminated nonwoven fabric 1 according to the third embodiment. FIG. 8 is a diagram for explaining the laminated nonwoven fabric 1 according to the fourth embodiment. FIG. 9 is a diagram for explaining an example of a method for producing a nonuniform basis weight nonwoven fabric. FIG. 10 is a diagram for explaining an example of a linear high basis weight portion and a linear low basis weight portion. FIG. 11 is a diagram for explaining a conventional laminated nonwoven fabric 101. FIG. FIG. 12 is a diagram for explaining a conventional laminated nonwoven fabric 101. FIG. FIG. 13 is a diagram for explaining Example 1. FIG. FIG. 14 is a diagram for explaining the second embodiment. FIG. 15 is a diagram for explaining Comparative Example 1. FIG. FIG. 16 is a diagram for explaining Comparative Example 2. FIG.

[definition]
・"Follow a given direction" for the target object
As used herein, "along a predetermined direction" with respect to an object extends such that the object has an intersection angle of less than ±90° with a predetermined direction (e.g., first direction, second direction, etc.). means that In addition, when the object extends in a direction along the predetermined direction, the object is preferably 60° or less, more preferably 45° or less, even more preferably 30° or less, and even more preferably, the predetermined direction. have a crossing angle of 20° or less, and even more preferably 5° or less.
In this specification, when the crossing angle is 5° or less, it may be referred to as "parallel to the predetermined direction".

Specifically, the present disclosure relates to the following aspects.
[Aspect 1]
A laminated nonwoven fabric for absorbent articles having a first direction, a second direction and a thickness direction orthogonal to each other and stretchable in the first direction,
The laminated nonwoven fabric comprises a first nonwoven fabric, a second nonwoven fabric, and an elastic member disposed between the first nonwoven fabric and the second nonwoven fabric in the thickness direction,
At least one of the first nonwoven fabric and the second nonwoven fabric has a nonuniform basis weight alternating structure in which high basis weight portions and low basis weight portions having a lower basis weight than the high basis weight portions alternate in the first direction. The amount of non-woven fabric,
wherein the elastic member is adhered to the first nonwoven fabric and the second nonwoven fabric with an adhesive;
The laminated nonwoven fabric characterized by the following.

In the laminated nonwoven fabric, at least one of the first nonwoven fabric and the second nonwoven fabric is a nonuniform basis weight nonwoven fabric having an alternating structure in which high basis weight portions and low basis weight portions are alternately formed in the first direction. Since the high basis weight portion has a larger amount of fibers constituting the non-uniform basis weight nonwoven fabric than the low basis weight portion, the high basis weight portion has excellent adhesion to the elastic member via the adhesive. . Therefore, the elastic member has excellent adhesiveness to the non-uniform basis weight nonwoven fabric, and separation between the elastic member and the non-uniform basis weight non-woven fabric is less likely to occur. As a result, the laminated nonwoven fabric has excellent adhesiveness.
In this specification, "adhesiveness between a predetermined portion and an elastic member via an adhesive" is simply referred to as "adhesiveness".

Further, in the laminated nonwoven fabric, the nonuniform basis weight nonwoven fabric has a low basis weight portion, so that the laminated nonwoven fabric is excellent in air permeability. The air permeability of the laminated nonwoven fabric is particularly excellent when the elastic member is stretched (hereinafter sometimes simply referred to as "stretched state").

Further, in the laminated nonwoven fabric, the nonuniform basis weight nonwoven fabric has a predetermined alternating structure in the first direction. Therefore, in the laminated nonwoven fabric, the low basis weight portion can form pleats when the elastic member is in a contracted state (hereinafter, sometimes simply referred to as a "contracted state"). As a result, the laminated nonwoven fabric is excellent in appearance.

Furthermore, in the laminated nonwoven fabric, the high basis weight portion makes it difficult for the user to touch the adhesive on the side of the nonuniform basis weight nonwoven fabric of the laminated nonwoven fabric.

[Aspect 2]
The laminated nonwoven fabric according to aspect 1, wherein the high basis weight portion extends along the second direction.
In the laminated nonwoven fabric, the high basis weight portion extends in the second direction. Therefore, when the laminated nonwoven fabric expands and contracts in the first direction, the high basis weight portion extending in the second direction has excellent adhesiveness to the elastic member via the adhesive. As a result, the laminated nonwoven fabric has excellent adhesiveness.

[Aspect 3]
The laminated nonwoven fabric according to aspect 1 or 2, wherein the low basis weight portion extends in a direction along the second direction.

In the laminated nonwoven fabric, the low basis weight portion extends in the second direction. Therefore, when the laminated nonwoven fabric is deformed from a stretched state (hereinafter sometimes simply referred to as a "stretched state") to a contracted state, the low basis weight portion extending in the second direction is It becomes easy to form dense folds extending in the direction along the . As a result, the laminated nonwoven fabric is excellent in appearance.
In addition, the dense pleats extending in the second direction are excellent in breathability due to the low basis weight portion. As a result, the laminated nonwoven fabric has excellent breathability.

[Aspect 4]
The laminated nonwoven fabric has a plurality of linear high basis weight portions and a plurality of linear low basis weight portions extending in the second direction from the high basis weight portion and the low basis weight portion, respectively. provided as part of
Aspects 1 to 3, wherein each of the plurality of linear high basis weight portions and each of the plurality of linear low basis weight portions are alternately arranged in an orthogonal direction perpendicular to the direction along the second direction. The laminated nonwoven fabric according to any one of .

The laminated nonwoven fabric comprises a predetermined plurality of linear high basis weight portions and a predetermined plurality of linear low basis weight portions. Therefore, the laminated nonwoven fabric is excellent in appearance and air permeability.

[Aspect 5]
5. The laminated nonwoven fabric of aspect 4, wherein the plurality of linear high basis weight portions have a linear high basis weight portion pitch of 2.0 to 10.0 mm.

In the laminated nonwoven fabric, the plurality of linear high basis weight portions have a predetermined linear high basis weight portion pitch. Therefore, the laminated nonwoven fabric easily forms denser folds, and the laminated nonwoven fabric is excellent in appearance.

[Aspect 6]
The laminated nonwoven fabric according to any one of aspects 2 to 5, wherein the direction along the second direction is parallel to the second direction.
In the laminated nonwoven fabric, the direction along the second direction is parallel to the second direction. Therefore, the laminated nonwoven fabric is excellent in appearance.

[Aspect 7]
The laminated nonwoven fabric according to any one of aspects 1 to 6, wherein the adhesive is intermittently applied in the first direction and/or the second direction in dots or lines.
The laminated nonwoven fabric is coated with an adhesive in a predetermined manner. Therefore, the laminated nonwoven fabric is excellent in air permeability and softness.

[Aspect 8]
The laminated nonwoven fabric according to any one of aspects 1 to 7, wherein the nonuniform basis weight nonwoven fabric is a heat-fusible nonwoven fabric containing heat-fusible fibers.

In the laminated nonwoven fabric, the nonuniform basis weight nonwoven fabric is a heat-fusible nonwoven fabric containing heat-fusible fibers. Therefore, the low basis weight portion tends to have a predetermined strength, and the laminated nonwoven fabric is excellent in strength in the first direction and the second direction.

[Aspect 9]
The laminated nonwoven fabric according to aspect 8, wherein the heat-fusible nonwoven fabric is a spunbond nonwoven fabric.
In the laminated nonwoven fabric, since the heat-fusible nonwoven fabric is a spunbond nonwoven fabric, the laminated nonwoven fabric has excellent strength in the first direction and the second direction.

[Aspect 10]
The laminated nonwoven fabric according to any one of aspects 1 to 9, wherein the nonuniform basis weight nonwoven fabric does not have through holes.
In the above laminated nonwoven fabric, since the nonuniform basis weight nonwoven fabric does not have through-holes, the user of the laminated nonwoven fabric is less likely to touch the adhesive through the through-holes.

[Aspect 11]
The laminated nonwoven fabric according to any one of aspects 1 to 10, wherein both the first nonwoven fabric and the second nonwoven fabric are the uneven basis weight nonwoven fabric.

In the laminated nonwoven fabric, both the first nonwoven fabric and the second nonwoven fabric are nonuniform basis weight nonwoven fabrics. Therefore, the above laminated nonwoven fabric is superior in adhesion and air permeability as compared with the case where one of the first nonwoven fabric and the second nonwoven fabric is nonuniform basis weight nonwoven fabric.

[Aspect 12]
An absorbent article comprising a member composed of the laminated nonwoven fabric according to any one of aspects 1 to 11.
The absorbent article includes a predetermined member, and the member is excellent in adhesiveness and air permeability.

The laminated nonwoven fabric of the present disclosure is described in detail below.
<First embodiment>
1 to 4 are diagrams for explaining a laminated nonwoven fabric 1 according to one embodiment of the present disclosure (hereinafter referred to as "first embodiment"). Specifically, FIGS. 1 and 2 are a front view and a rear view of the laminated nonwoven fabric 1, respectively. FIG. 3 is a plan view of the first nonwoven fabric 3. FIG. 4 is an end view at the IV-IV end face of FIG. 1. FIG.

1 and 2, a plurality of linear high basis weight portions 9 (high basis weight portions 7) in the first nonwoven fabric 3 are indicated by dots. 3 and 4, the basis weight of the air-through nonwoven fabric serving as the first nonwoven fabric 3 is represented by the density of the fibers, but the length and diameter of the fibers shown in FIG. 3 does not mean the fiber length and diameter of the air-through nonwoven fabric.

The laminated nonwoven fabric 1 has a first direction D ₁ , a second direction D ₂ and a thickness direction T which are perpendicular to each other, and is configured to be stretchable in the first direction D ₁ . The thickness direction T is divided into a first thickness direction T1 on the _first nonwoven fabric 3 side and a _second thickness direction T2 on the second nonwoven fabric 5 side, which will be described later.

The laminated nonwoven fabric 1 includes a first nonwoven fabric 3, a second nonwoven fabric 5, and a plurality of linear elastic members 15 arranged between the first nonwoven fabric 3 and the second nonwoven fabric 5 in the thickness direction T. there is
The first non-woven fabric 3 is a non-uniform basis weight non-woven fabric composed of an air-through non-woven fabric containing heat-fusible fibers, and does not have through-holes. The second nonwoven fabric 5 is a uniform basis weight nonwoven fabric having a uniform basis weight, which is composed of a spunbond nonwoven fabric.

The plurality of linear elastic members 15 extend in the _first direction D1 and are spaced apart in the _second direction D2. Specifically, as shown in FIG. ₁ , the plurality of linear elastic members 15 are arranged at a predetermined elastic member pitch P1 in a direction parallel to the _second direction D2.
Each of the plurality of linear elastic members 15 is adhered to both the first nonwoven fabric 3 and the second nonwoven fabric 5 while being stretched 2.0 times in the first direction D ₁ (stretch ratio: 2.0 times). It is glued with an agent (not shown).

For ease of understanding, the laminated nonwoven fabric 1 has a configuration in which the first nonwoven fabric 3 and the second nonwoven fabric 5 are joined while being shifted in the _first direction D1. Specifically, a region composed only of the first nonwoven fabric 3 arranged at one end in the first direction D ₁ and a second nonwoven fabric 5 arranged at the other end in the first direction D ₁ It has a region composed of only the sole and a region composed of the first nonwoven fabric 3, the plurality of linear elastic members 15 and the second nonwoven fabric 5 disposed therebetween. The above configuration consisting of three regions is for understanding the invention, and does not limit the structure of the laminated nonwoven fabric of the present disclosure.

The first nonwoven fabric 3 is a nonuniform basis weight nonwoven fabric having an alternating structure in which high basis weight portions 7 and low basis weight portions 11 having a basis weight lower than that of the high basis weight portions 7 are alternately arranged in the _first direction D1. is. Specifically, in the first nonwoven fabric 3, the high basis weight part 7 is composed of a plurality of linear high basis weight parts 9 extending in the direction parallel to the _second direction D2, and the low basis weight The portion 11 is composed of a plurality of linear low basis weight portions 13 extending in a direction parallel to the _second direction D2. The laminated nonwoven fabric 1 has an alternating structure in which each of the plurality of linear high basis weight portions 9 and each of the plurality of linear low basis weight portions 13 are alternately provided in a direction parallel to the _first direction D1. ing.
The plurality of linear high basis weight portions 9 are arranged at a predetermined linear _high basis weight portion pitch P2 in the _first direction D1.

In the laminated nonwoven fabric 1, each of the plurality of linear high basis weight portions 9 has a larger amount of fibers constituting the nonuniform basis weight nonwoven fabric than the plurality of linear low basis weight portions 13, so that the plurality of linear Each of the high basis weight portions 9 is excellent in adhesion to each of the plurality of linear elastic members 15 via an adhesive. Therefore, the plurality of linear elastic members 15 have excellent adhesion to the first nonwoven fabric 3 , and separation between the plurality of linear elastic members 15 and the first nonwoven fabric 3 is less likely to occur. As a result, the laminated nonwoven fabric 1 has excellent adhesiveness.

Moreover, in the laminated nonwoven fabric 1, since the first nonwoven fabric 3 has a plurality of linear low basis weight portions 13, the laminated nonwoven fabric 1 is excellent in breathability, especially in the stretched state.

As shown in FIG. 4 , when the laminated nonwoven fabric 1 is shrunk in the first direction D ₁ and brought into a contracted state, each of the plurality of linear low basis weight portions 13 of the laminated nonwoven fabric 1 and the thickness direction T , form the second nonwoven fabric side pleats 23 that contract in the _first direction D1 and protrude in the _second thickness direction T2.

On the second nonwoven fabric 5 side, the second nonwoven fabric side pleats 23 projecting in the second thickness direction T ₂ , like the plurality of linear low basis weight portions 13, extend in a direction parallel to the second direction D ₂ . intermittently extended. The second non-woven fabric side pleats 23 intermittently extend in a direction parallel to the _second direction D2 except for portions overlapping the plurality of linear elastic members 15 in the thickness direction T. As shown in FIG.
Therefore, the laminated nonwoven fabric 1 is excellent in appearance on the second nonwoven fabric 5 side in the contracted state.

Further, on the side of the first nonwoven fabric 3, portions of the laminated nonwoven fabric 1 that overlap with each of the plurality of linear high basis weight portions 9 in the thickness direction T protrude in the first thickness direction T ₁ , A first nonwoven fabric side pleat 21 intermittently extending in a direction parallel to the _second direction D2 is formed. The first non-woven fabric side pleats 21 intermittently extend in a direction parallel to the _second direction D2 except for portions overlapping the plurality of linear elastic members 15 in the thickness direction T. As shown in FIG.
Therefore, the laminated nonwoven fabric 1 is excellent in appearance on the side of the first nonwoven fabric 3 in the contracted state.

FIG. 11 is a diagram for explaining a conventional laminated nonwoven fabric 101. FIG. The conventional laminated nonwoven fabric 101 has the same configuration as the laminated nonwoven fabric 1 in the first embodiment, except that the first nonwoven fabric 3 is a uniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric.
In other words, in the conventional laminated nonwoven fabric 101, the first nonwoven fabric 3 and the second nonwoven fabric 5 are a uniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric and a uniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric, respectively.

In the conventional laminated nonwoven fabric 101, since each of the first nonwoven fabric 3 and the second nonwoven fabric 5 is a uniform basis weight nonwoven fabric, the first nonwoven fabric side folds 21 and the second nonwoven fabric side folds 23 are It becomes random and large, and is inferior in appearance.

<Second embodiment>
5 and 6 are diagrams for explaining a laminated nonwoven fabric 1 according to another embodiment of the present disclosure (hereinafter referred to as "second embodiment"). Specifically, FIGS. 5 and 6 are a front view and a rear view of the laminated nonwoven fabric 1, respectively.

The laminated nonwoven fabric 1 has a first direction D ₁ , a second direction D ₂ and a thickness direction T which are perpendicular to each other, and is configured to be stretchable in the first direction D ₁ .
The laminated nonwoven fabric 1 includes a first nonwoven fabric 3, a second nonwoven fabric 5, and a plurality of linear elastic members 15 arranged between the first nonwoven fabric 3 and the second nonwoven fabric 5 in the thickness direction T. there is

The first nonwoven fabric 3 is a nonuniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric containing heat-fusible fibers, and does not have through holes. The second nonwoven fabric 5 is a nonuniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric containing heat-fusible fibers, and does not have through holes.
The plurality of linear elastic members 15 in the second embodiment are the same as the plurality of linear elastic members 15 in the first embodiment, so description thereof will be omitted.

As in the first embodiment, in the laminated nonwoven fabric 1 according to the second embodiment, for the sake of understanding, the first nonwoven fabric 3 and the second nonwoven fabric 5 are joined while being shifted in the _first direction D1. A region composed only of the first nonwoven fabric 3 arranged at one end in the first direction D ₁ and only the second nonwoven fabric 5 arranged at the other end in the first direction D ₁ and a region composed of the first nonwoven fabric 3, the plurality of linear elastic members 15, and the second nonwoven fabric 5 disposed therebetween. The above configuration consisting of three regions is for understanding the invention, and does not limit the structure of the laminated nonwoven fabric of the present disclosure.

Like the first nonwoven fabric 3 in the first embodiment, the first nonwoven fabric 3 has a plurality of linear high basis weight portions 9 (high basis weight portions 7) extending in a direction parallel to the _second direction D2, It has a plurality of linear low basis weight portions 13 (low basis weight portions 11) extending in a direction parallel to the _second direction D2. Each of the plurality of linear high basis weight portions 9 and each of the plurality of linear low basis weight portions 13 have an alternating structure alternately in a direction parallel to the _first direction D1.
In the first nonwoven fabric 3, the plurality of linear high basis weight portions 9 are arranged at a predetermined linear _high basis weight portion pitch P2 in the _first direction D1.

The second nonwoven fabric 5 is made of the same nonwoven fabric as the first nonwoven fabric 3 . Specifically, like the first nonwoven fabric 3 in the first embodiment, the _second nonwoven fabric 5 has a plurality of linear high basis weight portions 9 (high basis weight 7) and a plurality of linear low basis weight portions 13 (low basis weight portions 11) extending in a direction parallel to the _second direction D2. Each of the plurality of linear high basis weight portions 9 and each of the plurality of linear low basis weight portions 13 have an alternating structure alternately in a direction parallel to the _first direction D1.
In the second nonwoven fabric 5, the plurality of linear high basis weight portions 9 are arranged at a predetermined linear _high basis weight portion pitch P2 in the _first direction D1.

The laminated nonwoven fabric 1 according to the second embodiment is excellent in adhesiveness and breathability for the same reason as the laminated nonwoven fabric 1 according to the first embodiment. In addition, in the laminated nonwoven fabric 1 according to the second embodiment, each of the first nonwoven fabric 3 and the second nonwoven fabric 5 is a nonuniform basis weight nonwoven fabric, so the laminated nonwoven fabric 1 has excellent appearance, and the first nonwoven fabric 3 side and on both sides of the second nonwoven fabric 5 side, it is difficult to touch the adhesive.

<Third Embodiment>
FIG. 7 is a diagram for explaining a laminated nonwoven fabric 1 according to yet another embodiment of the present disclosure (hereinafter referred to as "third embodiment"). Specifically, FIG. 7 is a front view of the laminated nonwoven fabric 1. FIG. A back view of the laminated nonwoven fabric 1 is omitted because it is the same as the front view.

The laminated nonwoven fabric 1 according to the third embodiment is the same as the laminated nonwoven fabric 1 according to the first embodiment except that the plurality of linear elastic members 15 are changed to planar elastic members 31 .
The planar elastic member 31 is stretched 2.5 times in the first direction D ₁ (stretching ratio: 2.5 times), and both the first nonwoven fabric 3 and the second nonwoven fabric 5 are linearly stretched. Specifically, they are adhered with an adhesive (not shown) applied in an Ω shape.

In the laminated nonwoven fabric 1 in the contracted state, the portions of the laminated nonwoven fabric 1 that overlap each of the plurality of linear high basis weight portions 9 in the thickness direction (not shown) extend in the first thickness direction (not shown). ) and continuously extending in a direction parallel to the _second direction D2.
In addition, in the laminated nonwoven fabric 1 in the contracted state, the portions overlapping each of the plurality of linear low basis weight portions 13 in the thickness direction (not shown) of the laminated nonwoven fabric 1 are in the second thickness direction ( (not shown) and extend continuously in a direction parallel to the _second direction D2.

For the same reason as the laminated nonwoven fabric 1 according to the first embodiment, the laminated nonwoven fabric 1 according to the third embodiment has excellent adhesiveness and air permeability, and the surface on the first nonwoven fabric 3 side is less likely to come into contact with the adhesive.
Moreover, the laminated nonwoven fabric 1 according to the third embodiment is excellent in appearance.

FIG. 12 is a diagram for explaining a conventional laminated nonwoven fabric 101. FIG. The conventional laminated nonwoven fabric 101 has the same configuration as the laminated nonwoven fabric 1 in the third embodiment, except that the first nonwoven fabric 3 is a uniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric.
In other words, in the conventional laminated nonwoven fabric 101, the first nonwoven fabric 3 and the second nonwoven fabric 5 are a uniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric and a uniform basis weight nonwoven fabric composed of a spunbond nonwoven fabric, respectively.

In the conventional laminated nonwoven fabric 101, since each of the first nonwoven fabric 3 and the second nonwoven fabric 5 is a uniform basis weight nonwoven fabric, the first nonwoven fabric side folds 21 and the second nonwoven fabric side folds 23 are It extends in a direction deviated from the _second direction D2 and is inferior in appearance.

<Fourth Embodiment>
FIG. 8 is a diagram for explaining a laminated nonwoven fabric 1 according to yet another embodiment of the present disclosure (hereinafter referred to as "fourth embodiment"). Specifically, FIG. 8 is a front view of the laminated nonwoven fabric 1. FIG. A back view of the laminated nonwoven fabric 1 is omitted because it is the same as the front view.
The laminated nonwoven fabric 1 according to the fourth embodiment is the same as the laminated nonwoven fabric 1 according to the second embodiment except that the plurality of linear elastic members 15 are changed to planar elastic members 31 .
The planar elastic member 31 is stretched 2.5 times in the first direction D ₁ (stretch ratio: 2.5 times), and an adhesive ( not shown).

The laminated nonwoven fabric 1 according to the fourth embodiment has excellent adhesion and air permeability for the same reason as the laminated nonwoven fabric 1 according to the third embodiment, and both sides of the first nonwoven fabric 3 side and the second nonwoven fabric 5 side are in contact with the adhesive. Hateful.
Moreover, the laminated nonwoven fabric 1 according to the fourth embodiment is excellent in appearance.

The laminated nonwoven fabric of the present disclosure is a laminated nonwoven fabric for absorbent articles that has a first direction, a second direction, and a thickness direction perpendicular to each other and is stretchable in the first direction.
Further, the laminated nonwoven fabric of the present disclosure includes a first nonwoven fabric, a second nonwoven fabric, and an elastic member arranged between the first nonwoven fabric and the second nonwoven fabric in the thickness direction.

At least one of the first nonwoven fabric and the second nonwoven fabric has a non-uniform basis weight alternating structure in which high basis weight portions and low basis weight portions having a lower basis weight than the high basis weight portions alternate in the first direction. It is a non-woven fabric.
In this specification, in order to distinguish from "non-uniform basis weight nonwoven fabric", a nonwoven fabric that does not have a high basis weight part and a low basis weight part with a basis weight lower than the high basis weight part is referred to as "uniform It may be referred to as "basis weight nonwoven fabric". The unevenness of the nonwoven fabric does not correspond to the high basis weight portion and the low basis weight portion.

Each of the first nonwoven fabric and the second nonwoven fabric can be a nonwoven fabric used in the technical field of absorbent articles, regardless of whether it corresponds to a nonuniform basis weight nonwoven fabric or a uniform basis weight nonwoven fabric. Examples of the nonwoven fabric include air-through nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, SMS nonwoven fabric, point bond nonwoven fabric, spunlace nonwoven fabric (wet and dry), and the like.

When the first nonwoven fabric and/or the second nonwoven fabric are uneven basis weight nonwoven fabrics, the first nonwoven fabric and/or the second nonwoven fabric as the nonuniform basis weight nonwoven fabrics are heat-sealable nonwoven fabrics containing heat-fusible fibers. It is preferably a flexible nonwoven fabric. As a result, the low basis weight portion also tends to have a predetermined strength, and the laminated nonwoven fabric tends to be excellent in strength in the first direction and the second direction. Examples of the heat-fusible nonwoven fabric include air-through nonwoven fabrics and spunbond nonwoven fabrics, with spunbond nonwoven fabrics being preferred. As a result, the laminated nonwoven fabric tends to have excellent strength in the first direction and the second direction.

When the first nonwoven fabric and/or the second nonwoven fabric are uneven basis weight nonwoven fabrics, the first nonwoven fabric and/or the second nonwoven fabric as the uneven basis weight nonwoven fabric can be produced as follows.
An air-through nonwoven fabric as a nonuniform basis weight nonwoven fabric can be produced, for example, by the methods described in JP-A-2008-002034, JP-A-2008-025078, and the like.

A spunbond nonwoven fabric as a nonuniform basis weight nonwoven fabric can be produced, for example, according to the method described in JP-A-2017-206803. Specifically, the first nonwoven fabric 3 in the first embodiment extends in the transport direction MD as shown in FIG. 9 and is spaced apart in the cross direction CD orthogonal to the transport direction MD. , with a filter belt 201 having a plurality of closures 203 .

In the laminated nonwoven fabric of the present disclosure, each of the nonuniform basis weight nonwoven fabric and the uniform basis weight nonwoven fabric may or may not have through holes, but should not have through holes. is preferred. This is because, if the laminated nonwoven fabric has through holes, the user may touch the adhesive through the through holes.

Each of the first nonwoven fabric and the second nonwoven fabric is preferably 5 to 50 g/m ² , more preferably 7 to 40 g/m ² , and more preferably 7 to 40 g/m 2 , regardless of whether it is a nonuniform basis weight nonwoven fabric or a uniform basis weight nonwoven fabric. It may preferably have a basis weight of 10 to 30 g/m ² . This is from the viewpoint of the effects of the present disclosure.
In addition, when each of the first nonwoven fabric and the second nonwoven fabric is a nonuniform basis weight nonwoven fabric, the above basis weight means an average basis weight.

As the elastic member, those used in the technical field of absorbent articles can be employed as they are, and examples thereof include planar elastic members, linear elastic members, and the like.
Examples of the planar elastic member include stretchable webs described in JP-A-2006-521223 and stretchable nonwoven fabrics described in JP-A-2004-244791.

In general, when the elastic member is a planar elastic member, the laminated nonwoven fabric is less likely to have dense and aesthetic pleats in the stretched state than when it is a linear elastic member. Tend.
In the laminated nonwoven fabric of the present disclosure, even when the elastic member is a planar elastic member, the folded nonwoven fabric tends to have dense and aesthetic pleats in the contracted state.

The draw ratio for adhering the elastic member to the first nonwoven fabric and the second nonwoven fabric is not particularly limited, and a draw ratio commonly used in the field of absorbent articles can be adopted. The draw ratio varies depending on the part of the absorbent article in which the laminated nonwoven fabric of the present disclosure is used, but is preferably 1.3 to 5.0 times, more preferably 1.5 to 4.0 times, and further It is preferably in the range of 1.8 times to 3.5 times.

When the elastic member is a plurality of linear elastic members, the distance between the plurality of linear elastic members in the second direction is the same as the distance used in the technical field of absorbent articles, preferably They can be arranged at an elastic member pitch of 1-15 mm, and more preferably 2-10 mm.

When the laminated nonwoven fabric of the present disclosure is used, for example, as a waist gather forming member for forming the waist gather of a disposable diaper, the elastic member pitch can be, for example, 5 to 15 mm. Further, when the laminated nonwoven fabric of the present disclosure is used as a fit gather forming member for forming a fit gather of a disposable diaper, for example, the elastic member pitch can be, for example, 3 to 10 mm.

In the laminated nonwoven fabric of the present disclosure, the elastic member is adhered to the first nonwoven fabric and the second nonwoven fabric with an adhesive.
In the case where the elastic member is a planar elastic member, the planar elastic member may be adhered to the first nonwoven fabric and the second nonwoven fabric with the adhesive by coating the entire surface of the planar elastic member with an adhesive by curtain spray or the like. good. Further, when the elastic member is a planar elastic member, the adhesive is applied in a dot shape or a linear shape (for example, spiral shape, Ω shape, Z shape, pattern shape, etc.) in the first direction and/or It is possible to intermittently coat the planar elastic member or the first nonwoven fabric and the second nonwoven fabric in the second direction to bond the planar elastic member to the first nonwoven fabric and the second nonwoven fabric. Thereby, the laminated nonwoven fabric is excellent in air permeability and softness.

When the elastic member is a linear elastic member, an adhesive can be applied to the entire surface of the linear elastic member to adhere the linear elastic member to the first nonwoven fabric and the second nonwoven fabric, Then, the adhesive is applied intermittently in the first direction and/or the second direction in a dot shape or a linear shape (for example, spiral shape, Ω shape, Z shape, pattern shape, etc.) to the first nonwoven fabric and / or the second nonwoven fabric. By coating the nonwoven fabric, the linear elastic member can be adhered to the first nonwoven fabric and the second nonwoven fabric.
In the laminated nonwoven fabric of the present disclosure, the first nonwoven and the second nonwoven may be unbonded and may be bonded, eg, glued together.

In the laminated nonwoven fabric of the present disclosure, the nonuniform basis weight nonwoven fabric has the above-described alternating structure (in the first direction, alternating high basis weight portions and low basis weight portions having a lower basis weight than the high basis weight portions. alternating structures) in certain regions in the second direction and in any region (ie, all regions) in the second direction.
By having the above-described alternating structure in any region in the second direction, the uneven basis weight nonwoven fabric more easily exhibits the effects of the present disclosure.

In the laminated nonwoven fabric of the present disclosure, the high basis weight portion in the nonuniform basis weight nonwoven fabric preferably extends in the second direction. Thereby, the laminated nonwoven fabric is excellent in adhesiveness.
Moreover, it is preferable that the low basis weight portion extends in a direction along the second direction. Thereby, the said laminated nonwoven fabric is excellent in appearance.

In the laminated nonwoven fabric of the present disclosure, the high basis weight portion and the low basis weight portion in the nonuniform basis weight nonwoven fabric are each arranged in a direction along the second direction (preferably in a direction parallel to the second direction) It can be provided as a plurality of linear high basis weight portions and a plurality of linear low basis weight portions extending therefrom. In addition, each of the plurality of linear high basis weight portions and each of the plurality of linear low basis weight portions are in a direction perpendicular to the direction along the second direction (preferably, a direction parallel to the first direction). ) are alternately arranged. As a result, the laminated nonwoven fabric is excellent in appearance and air permeability.

Each of the plurality of linear high basis weight portions and each of the plurality of linear low basis weight portions have an axis extending in a predetermined direction, for example, a direction along the second direction. , for example, straight, curved, and zigzag shapes.

FIG. 10(a) is a diagram for explaining a non-uniform basis weight nonwoven fabric 301 having a plurality of linear high basis weight portions 303 and a plurality of linear low basis weight portions 305. FIG. be. Each of the plurality of linear high basis weight portions 303 and each of the plurality of linear low basis weight portions 305 has a linear axis A and is orthogonal to axis A. are arranged alternately in the direction of Also, the plurality of linear high basis weight portions 303 are arranged in a direction perpendicular to the axis A at a predetermined linear _high basis weight portion pitch P2. In addition, the area occupied by the plurality of linear high basis weight portions 303 is represented by a dot pattern.

FIG. 10(b) is a diagram for explaining a non-uniform basis weight nonwoven fabric 301 having a plurality of curved linear high basis weight portions 303 and a plurality of curved linear low basis weight portions 305. FIG. be. Each of the plurality of curved linear high basis weight portions 303 and each of the plurality of curved linear low basis weight portions 305 has a linear axis A and is orthogonal to axis A. are arranged alternately in the direction of In addition, the area occupied by the plurality of linear high basis weight portions 303 is represented by a dot pattern.

FIG. 10(c) is a diagram for explaining a non-uniform basis weight nonwoven fabric 301 having a plurality of zigzag linear high basis weight portions 303 and a plurality of zigzag linear low basis weight portions 305. FIG. be. Each of the plurality of zigzag linear high basis weight portions 303 and each of the plurality of zigzag linear low basis weight portions 305 has a linear axis A and is perpendicular to the axis A. are arranged alternately in the direction of In addition, the area occupied by the plurality of linear high basis weight portions 303 is represented by a dot pattern.

In the laminated nonwoven fabric of the present disclosure, the axis A mentioned above can extend in a direction along the second direction, and preferably can extend in a direction parallel to the second direction. Also, the direction orthogonal to the axis A can extend in a direction orthogonal to the direction along the second direction, and preferably can extend in a direction parallel to the first direction.

Preferably, the plurality of linear high basis weight portions are arranged at a predetermined linear high basis weight portion pitch in a direction perpendicular to the axis (a direction perpendicular to the direction along the first direction).
The linear high basis weight portion pitch is preferably 2.0 to 10.0 mm, more preferably 3.0 to 8.0 mm, and even more preferably 4.0 to 6.0 mm. Thereby, the said laminated nonwoven fabric tends to be excellent in appearance.

When the elastic member is a plurality of linear elastic members, the pitch of the linear high basis weight portion is preferably 0.2 to 4.0 times the elastic member pitch of the plurality of linear elastic members, for example. , more preferably 0.4 to 3.0 times, and even more preferably 0.6 to 2.5 times. Thereby, the said laminated nonwoven fabric tends to be excellent in appearance.

In the laminated nonwoven fabric of the present disclosure, at least one of the first nonwoven and the second nonwoven is the nonuniform basis weight nonwoven described above, and both the first nonwoven and the second nonwoven are the nonuniform basis weight nonwovens described above. may This is from the viewpoint of the effects of the present disclosure.

Further, when both the first nonwoven fabric and the second nonwoven fabric are the nonuniform basis weight nonwoven fabrics described above, the high basis weight portion and the low basis weight portion of the first nonwoven fabric and the high basis weight portion of the second nonwoven fabric The portion and the low basis weight portion may have the same shape or may have different shapes.
Furthermore, when the high basis weight portion and the low basis weight portion of the first nonwoven fabric and the high basis weight portion and the low basis weight portion of the second nonwoven fabric have the same shape, the high basis weight portion and the low basis weight portion of the second nonwoven fabric have the same shape. The basis weight portion and the high basis weight portion of the second nonwoven fabric may or may not be arranged so as to overlap in the thickness direction.

The laminated nonwoven fabric of the present disclosure is for absorbent articles, and examples of the absorbent article include disposable diapers, sanitary shorts-type napkins, and disposable shorts.
When the absorbent article is a disposable diaper, the laminated nonwoven fabric is used as a waist gather forming member for forming waist gathers, a fit gather forming member for forming fitted gathers, and the like.

Laminated nonwoven fabrics of the present disclosure can be manufactured by methods known in the art. For example, the laminated nonwoven fabric of the present disclosure can be produced by applying an adhesive to the first nonwoven fabric and the second nonwoven fabric and joining them with an elastic member stretched at a predetermined draw ratio sandwiched between them.

The present disclosure will be described below using examples, but the present disclosure is not limited to these examples.
[Example 1]
Under the following conditions, laminated nonwoven fabric No. 1 was produced. Laminated nonwoven fabric No. 13 shows an image of the first nonwoven fabric side of No. 1. Laminated nonwoven fabric No. 1 corresponds to the laminated nonwoven fabric 1 according to the first embodiment, but the type of nonwoven fabric is different.
[First nonwoven fabric]
・Type: Spunbond nonwoven fabric (nonuniform basis weight nonwoven fabric, average basis weight: 15 g/m ² )
・Linear high basis weight part pitch: 4.9 mm
[Second nonwoven fabric]
・Type: Spunbond nonwoven fabric (uniform basis weight nonwoven fabric, basis weight: 15 g/m ² )
[Elastic member]
・Type: Linear elastic member, Spandex 470 Dtex
・Elastic member pitch: 5.0 mm
・Stretch ratio: 2.0 times

[Example 2]
Under the following conditions, laminated nonwoven fabric No. 2 was produced. Laminated nonwoven fabric No. 14 shows an image of the first nonwoven fabric side of No. 2. Laminated nonwoven fabric No. 2 corresponds to the laminated nonwoven fabric 1 according to the third embodiment, but the type of nonwoven fabric is different.
[First nonwoven fabric]
・Type: Spunbond nonwoven fabric (nonuniform basis weight nonwoven fabric, average basis weight: 15 g/m ² )
・Linear high basis weight part pitch: 4.9 mm
[Second nonwoven fabric]
・Type: Spunbond nonwoven fabric (uniform basis weight nonwoven fabric, basis weight: 15 g/m ² )
[Elastic member]
・Type: Planar elastic member (TPU/PO composite stretchable nonwoven fabric, basis weight: 60 g/m ² )
*TPU: Thermoplastic polyurethane resin
*PO: Polyolefin resin ・Stretch ratio: 2.5 times

[Comparative Example 1]
Under the following conditions, laminated nonwoven fabric No. 3 was produced. Laminated nonwoven fabric No. An image of the first nonwoven fabric side of No. 3 is shown in FIG. Laminated nonwoven fabric No. 3 corresponds to the laminated nonwoven fabric 101 shown in FIG.
[First nonwoven fabric]
・Type: Spunbond nonwoven fabric (uniform basis weight nonwoven fabric, basis weight: 15 g/m ² )
[Second nonwoven fabric]
・Type: Spunbond nonwoven fabric (uniform basis weight nonwoven fabric, basis weight: 15 g/m ² )
[Elastic member]
・Type: Linear elastic member, Spandex 470 Dtex
・Elastic member pitch: 5.0 mm
・Stretch ratio: 2.0 times

[Comparative Example 2]
Under the following conditions, laminated nonwoven fabric No. 4 was produced. Laminated nonwoven fabric No. 4 shows an image of the first nonwoven fabric side in FIG. Laminated nonwoven fabric No. 3 corresponds to the laminated nonwoven fabric 101 shown in FIG.
[First nonwoven fabric]
・Type: Spunbond nonwoven fabric (uniform basis weight nonwoven fabric, basis weight: 15 g/m ² )
[Second nonwoven fabric]
・Type: Spunbond nonwoven fabric (uniform basis weight nonwoven fabric, basis weight: 15 g/m ² )
[Elastic member]
・Type: Planar elastic member (TPU/PO composite stretchable nonwoven fabric, basis weight: 60 g/m ² )
・Stretch ratio: 2.5 times

1 Laminated nonwoven fabric 3 First nonwoven fabric 5 Second nonwoven fabric 7 High basis weight part 9 Linear high basis weight part 11 Low basis weight part 13 Linear low basis weight part 15 Linear elastic member 21 First nonwoven fabric side folds 23 Second second Non-woven fabric side folds 31 Planar elastic member D1 _First direction D2 _Second direction T Thickness direction

Claims (12)

A laminated nonwoven fabric for absorbent articles having a first direction, a second direction and a thickness direction orthogonal to each other and stretchable in the first direction,
The laminated nonwoven fabric comprises a first nonwoven fabric, a second nonwoven fabric, and an elastic member disposed between the first nonwoven fabric and the second nonwoven fabric in the thickness direction,
At least one of the first nonwoven fabric and the second nonwoven fabric has a nonuniform basis weight alternating structure in which high basis weight portions and low basis weight portions having a lower basis weight than the high basis weight portions alternate in the first direction. The amount of non-woven fabric,
wherein the elastic member is adhered to the first nonwoven fabric and the second nonwoven fabric with an adhesive;
The laminated nonwoven fabric characterized by the following. 2. The laminated nonwoven fabric of claim 1, wherein the high basis weight portion extends along the second direction. The laminated nonwoven fabric according to claim 1 or 2, wherein the low basis weight portion extends along the second direction. The laminated nonwoven fabric has a plurality of linear high basis weight portions and a plurality of linear low basis weight portions extending in the second direction from the high basis weight portion and the low basis weight portion, respectively. provided as part of
Each of the plurality of linear high basis weight portions and each of the plurality of linear low basis weight portions are alternately arranged in an orthogonal direction perpendicular to the direction along the second direction. 4. The laminated nonwoven fabric according to any one of 3. 5. The laminated nonwoven fabric of claim 4, wherein said plurality of linear high basis weight portions have a linear high basis weight portion pitch of 2.0 to 10.0 mm. The laminated nonwoven fabric according to any one of claims 2 to 5, wherein the direction along the second direction is parallel to the second direction. The laminated nonwoven fabric according to any one of claims 1 to 6, wherein the adhesive is applied intermittently in the first direction and/or the second direction in the form of dots or lines. The laminated nonwoven fabric according to any one of claims 1 to 7, wherein the nonuniform basis weight nonwoven fabric is a heat-fusible nonwoven fabric containing heat-fusible fibers. 9. The laminated nonwoven fabric according to claim 8, wherein said heat-fusible nonwoven fabric is a spunbond nonwoven fabric. The laminated nonwoven fabric according to any one of claims 1 to 9, wherein the nonuniform basis weight nonwoven fabric does not have through holes. The laminated nonwoven fabric according to any one of claims 1 to 10, wherein both the first nonwoven fabric and the second nonwoven fabric are said nonuniform basis weight nonwoven. An absorbent article comprising a member composed of the laminated nonwoven fabric according to any one of claims 1 to 11.

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