JP2021186213A - Laminated non-woven fabric and absorbent article - Google Patents

Abstract

To provide a laminated non-woven fabric that is excellent in a bonding property and a ventilating property.SOLUTION: A laminated non-woven fabric 1 for an absorbent article is extendable and contractible in a first direction D1. The laminated non-woven fabric 1 comprises a first non-woven fabric 3, a second non-woven fabric 5, and an elastic member 15 or 31 arranged between them, in a thickness direction T. At least one of the first non-woven fabric 3 and the second non-woven fabric 5 is an uneven basis weight non-woven fabric comprising an alternating structure alternately comprising high basis weight parts 7 and low basis weight parts 11 in the first direction D1. The elastic member 15 or 31 is bonded to the first non-woven fabric 3 and the second non-woven fabric 5 by an adhesive.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a laminated nonwoven fabric and an absorbent article containing the laminated nonwoven fabric.

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

For example, Patent Document 1 discloses the following worn articles.
It has a chassis, side panels, and fasteners, and the chassis has a front-rear direction and a lateral direction that are orthogonal to each other, and an inseam area that is interposed between the front waist area, the rear waist area, and both waist areas in the front-rear direction. The side panel extends in the lateral direction from both side edges of one of the front and rear girth regions of the chassis, and is non-extensible from the side panel in the lateral direction. A disposable wearable article in which the fastener is extended and the connection of both waist circumferences via the side panel can be repeated by using the fastener.
The side panel is formed with an elastic region between the chassis and the fastener that can repeat elastic extension and contraction in the lateral direction, and the elastic region is formed on the inner surface side of the worn article. The outer surface side is formed of non-woven fabric,
In the elastic region, the hot melt adhesive is applied to the nonwoven fabric on the inner surface side with a width of 1-5 mm, and the plurality of strip-shaped coated portions extending in the front-rear direction are spaced from each other by 1-5 mm. By arranging in the lateral direction, a coating area of the hot melt adhesive is formed, and a plurality of elastic members extending in parallel with each other in the lateral direction extend to the nonwoven fabric via the hot melt adhesive in the coating area. The worn article, which is joined in a state and is formed by shrinking the elastic member to form a plurality of gathers extending in the front-rear direction on the nonwoven fabric on the inner surface side.

Japanese Unexamined Patent Publication No. 2014-4334

In the worn article described in Patent Document 1, in the elastic region, a plurality of strip-shaped coated portions that are coated on the nonwoven fabric with a width of 1-5 mm and extend in the front-rear direction are laterally spaced from each other by 1-5 mm. Since it has a coating area of hot melt adhesives that are lined up, it has excellent adhesion between the elastic member and the non-woven fabric, but there is room for improvement in air permeability due to the coating area of the hot melt adhesive.
Therefore, it is an object of the present disclosure to provide a laminated nonwoven fabric having excellent adhesiveness and breathability.

The present disclosures are laminated nonwoven fabrics for absorbent articles that have a first direction, a second direction, and a thickness direction orthogonal to each other and are expandable and contractible in the first direction. In the thickness direction, the first nonwoven fabric, the second nonwoven fabric, and the elastic member arranged between the first nonwoven fabric and the second nonwoven fabric are provided, and at least one of the first nonwoven fabric and the second nonwoven fabric is provided. In the first direction, it is a non-uniform nonwoven fabric having an alternating structure in which high basis weight portions and low basis weight portions having a lower basis weight than the high basis weight portion are alternately provided, and the elastic member is the first. We have found a laminated non-woven fabric characterized by being adhered to a non-woven fabric and a second non-woven 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 the 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 non-uniform 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 the conventional laminated nonwoven fabric 101. FIG. 12 is a diagram for explaining the conventional laminated nonwoven fabric 101. FIG. 13 is a diagram for explaining the first embodiment. FIG. 14 is a diagram for explaining the second embodiment. FIG. 15 is a diagram for explaining Comparative Example 1. FIG. 16 is a diagram for explaining Comparative Example 2.

[Definition]
・ "Along a predetermined direction" regarding an object
As used herein, "along a predetermined direction" with respect to an object means that the object extends so as to have an intersection angle of less than ± 90 ° with a predetermined direction (eg, first direction, second direction, etc.). It means that you are. Further, when the object extends in a direction along a predetermined direction, the object is preferably 60 ° or less, more preferably 45 ° or less, still more preferably 30 ° or less, and even more preferably in the predetermined direction. Has an intersection 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 a predetermined direction".

Specifically, the present disclosure relates to the following aspects.
[Aspect 1]
A laminated non-woven fabric for absorbent articles that has a first direction, a second direction, and a thickness direction that are orthogonal to each other and that can expand and contract in the first direction.
The laminated nonwoven fabric 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 tsubo having an alternating structure having a high basis weight portion and a low basis weight portion having a lower basis weight than the high basis weight portion in the first direction. It is a non-woven fabric,
The elastic member is adhered to the first nonwoven fabric and the second nonwoven fabric with an adhesive.
The above-mentioned laminated non-woven fabric, which is characterized by the above.

In the laminated nonwoven fabric, at least one of the first nonwoven fabric and the second nonwoven fabric is a non-woven fabric having an alternating structure having high basis weight portions and low basis weight portions alternately 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 adhesiveness to the elastic member via the adhesive. .. Therefore, the elastic member has excellent adhesiveness to the non-uniform basis weight nonwoven fabric, and peeling between the elastic member and the non-uniform basis weight nonwoven fabric is less likely to occur. As a result, the laminated nonwoven fabric is excellent in adhesiveness.
In addition, in this specification, "adhesiveness between a predetermined part and an elastic member via an adhesive" is simply referred to as "adhesiveness".

Further, in the laminated nonwoven fabric, since the non-woven fabric having a low basis weight portion, the laminated nonwoven fabric is excellent in breathability. The breathability is particularly excellent in the laminated nonwoven fabric in a state where the elastic member is stretched (hereinafter, may be simply referred to as "stretched state").

Further, in the laminated nonwoven fabric, the non-woven fabric having a non-uniform basis weight has a predetermined alternating structure in the first direction. Therefore, in the laminated nonwoven fabric, the low basis weight portion can form a fold portion in a state where the elastic member is contracted (hereinafter, may be simply referred to as a “contracted state”). As a result, the laminated non-woven fabric is excellent in aesthetics.

Further, in the laminated nonwoven fabric, due to the high basis weight portion, it becomes difficult for the user to touch the adhesive on the surface of the laminated nonwoven fabric on the non-uniform basis weight nonwoven fabric side.

[Aspect 2]
The laminated nonwoven fabric according to aspect 1, wherein the high basis weight portion extends in a direction along a second direction.
In the laminated nonwoven fabric, the high basis weight portion extends in the direction along the second direction. Therefore, when the laminated nonwoven fabric expands and contracts in the first direction, the high basis weight portion extending in the direction along the second direction is excellent in 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 a second direction.

In the laminated nonwoven fabric, the low basis weight portion extends in the direction along the second direction. Therefore, when the laminated nonwoven fabric is deformed from the stretched state (hereinafter, may be simply referred to as “stretched state”) to the contracted state, the low basis weight portion extending in the direction along the second direction is the second direction. It becomes easy to form a dense fold extending in the direction along the line. As a result, the laminated non-woven fabric is excellent in aesthetics.
Further, the dense folds extending in the direction along the second direction are excellent in air permeability due to the low basis weight portion. As a result, the laminated non-woven fabric has excellent breathability.

[Aspect 4]
The laminated nonwoven fabric extends the high basis weight portion and the low basis weight portion in a direction along a second direction, respectively, and has a plurality of linear high basis weight portions and a plurality of linear low basis weight portions. Prepared as a part,
Aspects 1 to 3 in which 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 orthogonal to a direction along the second direction. The laminated nonwoven fabric according to any one of the above.

The laminated nonwoven fabric includes a predetermined number of linear high basis weight portions and a predetermined number of linear low basis weight portions. Therefore, the laminated non-woven fabric is excellent in aesthetics and breathability.

[Aspect 5]
The laminated nonwoven fabric according to 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, a plurality of linear high basis weight portions have a predetermined linear high basis weight portion pitch. Therefore, the laminated nonwoven fabric tends to form more dense folds, and the laminated nonwoven fabric is excellent in aesthetics.

[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 non-woven fabric is excellent in aesthetics.

[Aspect 7]
The laminated nonwoven fabric according to any one of aspects 1 to 6, wherein the adhesive is dot-shaped or linear and is intermittently coated in the first direction and / or the second direction.
In the laminated nonwoven fabric, the adhesive is applied in a predetermined manner. Therefore, the laminated nonwoven fabric is excellent in breathability and softness.

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

In the laminated non-woven fabric, the non-woven fabric having a non-uniform basis weight is a heat-fused nonwoven fabric containing heat-fused 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-fused nonwoven fabric is a spunbonded nonwoven fabric.
In the laminated nonwoven fabric, since the heat-sealing nonwoven fabric is a spunbonded nonwoven fabric, the laminated nonwoven fabric is excellent in 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 non-woven fabric having a non-uniform basis weight does not have a through hole.
In the laminated nonwoven fabric, since the non-woven fabric having a non-uniform basis weight does not have through holes, it is difficult for the user of the laminated nonwoven fabric to come into contact with 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 non-woven fabric having a non-uniform basis weight.

In the laminated nonwoven fabric, both the first nonwoven fabric and the second nonwoven fabric are non-woven fabrics having a non-uniform basis weight. Therefore, the laminated nonwoven fabric is more excellent in adhesiveness and breathability as compared with the case where one of the first nonwoven fabric and the second nonwoven fabric is a non-uniform basis weight nonwoven fabric.

[Aspect 12]
An absorbent article comprising the member made of the laminated nonwoven fabric according to any one of aspects 1 to 11.
The absorbent article is provided with a predetermined member, which is more excellent in adhesiveness and breathability.

The laminated nonwoven fabric of the present disclosure will be described in detail below.
<First Embodiment>
1 to 4 are diagrams for explaining a laminated nonwoven fabric 1 according to one of the embodiments 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 of the IV-IV end face of FIG. 1.

In addition, in FIGS. 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. Further, in FIGS. 3 and 4, the magnitude of the basis weight of the air-through nonwoven fabric as the first nonwoven fabric 3 is expressed by the density of the fibers, but the length and diameter of the fibers shown in FIG. 3 are the first nonwoven fabric. It does not mean the length and diameter of the fibers of the air-through nonwoven fabric as 3.

The laminated nonwoven fabric 1 has a first direction D ₁ , a second direction D ₂ and a thickness direction T orthogonal to each other, and is configured to be expandable and contractible in _{the first direction D 1.} The thickness direction T is divided into a first thickness direction T _{1 on the first nonwoven fabric 3 side and a second thickness direction T 2} on the second nonwoven fabric 5 side, which will be described later.

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

The plurality of linear elastic members 15 _{extend in the first direction D 1} and are arranged in a state of being separated from each other in the second direction D _2. Specifically, as shown in FIG. 1, the plurality of linear elastic members 15 are arranged at a predetermined elastic member pitch P _{1 in a direction parallel to the second direction D 2.}
Each of the plurality of linear elastic members 15 is adhered to both the first nonwoven fabric 3 and the second nonwoven fabric 5 in a state of being stretched 2.0 times in _{the first direction D 1 (stretch ratio: 2.0 times).} It is adhered with an agent (not shown).

Incidentally, the laminated nonwoven fabric 1, for ease of understanding, the first nonwoven fabric 3, and the second nonwoven fabric 5 has a configuration that is joined in a state shifted in the first direction D _1, specifically specifically, the placed at one end of the first direction D _1, and a region composed of only the first nonwoven fabric 3, arranged on the other end of the first direction D _1, second nonwoven 5 It has a region composed of chisel and a region composed of a first nonwoven fabric 3, a plurality of linear elastic members 15, and a second nonwoven fabric 5 arranged between them. It should be noted that the above configuration including the three regions is for understanding the invention, and does not limit the structure of the laminated nonwoven fabric of the present disclosure in any way.

The first nonwoven fabric 3, in the first direction D _1, and the high basis weight portion 7, nonuniform basis weight nonwoven fabric having alternating structure alternately having a low basis weight, low basis weight portion 11 than the high basis weight portion 7 Is. Specifically, in the first non-woven fabric 3, the high basis weight portion 7 is composed of a plurality of linear high basis weight portions 9 extending in a direction parallel to _{the second direction D 2, and has a 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 D 2.} 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 D 1.} ing.
The plurality of linear high basis weight portions 9 are arranged at a predetermined linear high basis weight portion pitch P _{2 in the first direction D 1.}

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 non-uniform basis weight nonwoven fabric than the plurality of linear low basis weight portions 13, and thus has a plurality of linear shapes. Each of the high basis weight portions 9 is excellent in adhesion to each of the plurality of linear elastic members 15 via the adhesive. Therefore, the plurality of linear elastic members 15 are excellent in adhesiveness to the first nonwoven fabric 3, and peeling 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.

Further, 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, particularly breathability in an elongated state.

As shown in FIG. 4, when the laminated nonwoven fabric 1 is _{contracted in the first direction D 1} to be in 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 The overlapping portion forms a second non-woven fabric side fold portion 23 that contracts in the first direction D ₁ and protrudes in the second thickness direction T _2.

On the second nonwoven fabric 5 side, _{the second nonwoven fabric side folds 23 protruding in the second thickness direction T 2} are parallel to _{the second direction D 2} like each of the plurality of linear low basis weight portions 13. It extends intermittently. The second nonwoven fabric side fold portion 23 extends intermittently in a direction parallel _{to the second direction D 2} except for a portion overlapping the plurality of linear elastic members 15 in the thickness direction T.
Therefore, the laminated nonwoven fabric 1 is excellent in aesthetic appearance on the second nonwoven fabric 5 side in the shrunk state.

Further, on the first nonwoven fabric 3 side, each of the plurality of linear high basis weight portions 9 and the portion overlapping in the thickness direction T of the laminated nonwoven fabric 1 _{protrudes in the first thickness direction T 1} and also The first non-woven fabric side fold portion 21 extending intermittently in the direction parallel to the second direction D _{2 is formed.} The first non-woven fabric side fold portion 21 extends intermittently in a direction parallel _{to the second direction D 2} except for a portion overlapping the plurality of linear elastic members 15 in the thickness direction T.
Therefore, the laminated nonwoven fabric 1 is excellent in aesthetic appearance on the first nonwoven fabric 3 side in the shrunk state.

FIG. 11 is a diagram for explaining the conventional laminated nonwoven fabric 101. 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 nonwoven fabric composed of spunbonded 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 nonwoven fabric composed of a spunbonded nonwoven fabric and a uniform nonwoven fabric composed of a spunbonded 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 nonwoven fabric, the first nonwoven fabric side folds 21 and the second nonwoven fabric side folds 23 are in a contracted state. It becomes random and large, and is inferior in aesthetics.

<Second Embodiment>
5 and 6 are diagrams for explaining the 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 orthogonal to each other, and is configured to be expandable and contractible in _{the first direction D 1.}
The laminated nonwoven fabric 1 includes a plurality of linear elastic members 15 arranged between the first nonwoven fabric 3, the second nonwoven fabric 5, and 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 non-woven fabric having a non-uniform basis weight composed of a spunbonded nonwoven fabric containing heat-sealing fibers and does not have through holes. The second nonwoven fabric 5 is a non-woven fabric having a non-uniform basis weight composed of a spunbonded nonwoven fabric containing heat-sealing fibers and does not have through holes.
Since 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, the description thereof will be omitted.

As in the first embodiment, the laminated nonwoven fabric 1 according to the second embodiment, for better understanding, the first nonwoven fabric 3, and a second nonwoven 5, are joined in a state shifted in the first direction D ₁ cage, placed at one end of the first direction D _1, and a region composed of only the first nonwoven fabric 3, arranged on the other end of the first direction D _1, only the second non-woven fabric 5 It has a region composed of a region and a region composed of a first nonwoven fabric 3, a plurality of linear elastic members 15, and a second nonwoven fabric 5 arranged between them. It should be noted that the above configuration including the three regions is for understanding the invention, and does not limit the structure of the laminated nonwoven fabric of the present disclosure in any way.

Similar to the first non-woven fabric 3 in the first embodiment, the first non-woven fabric 3 has a plurality of linear high basis weight portions 9 (high basis weight portion 7) extending in a direction parallel to _{the second direction D 2.} It is provided with a plurality of linear low basis weight portions 13 (low basis weight portions 11) extending in a direction parallel to the second direction D _2. 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 having the plurality of linear high basis weight portions 9 alternately in a direction parallel to _{the first direction D 1.}
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 P _{2 in the first direction D 1.}

The second nonwoven fabric 5 is made of the same nonwoven fabric as the first nonwoven fabric 3. Specifically, the second non-woven fabric 5 has a plurality of linear high basis weight portions 9 (high basis weight) extending in a direction parallel to _{the second direction D 2} , similar to the first non-woven fabric 3 in the first embodiment. A portion 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 D 2 are provided.} 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 having the plurality of linear high basis weight portions 9 alternately in a direction parallel to _{the first direction D 1.}
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 P _{2 in the first direction D 1.}

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. Further, in the laminated nonwoven fabric 1 according to the second embodiment, since each of the first nonwoven fabric 3 and the second nonwoven fabric 5 is a non-woven fabric having a non-uniform basis weight, the laminated nonwoven fabric 1 is excellent in aesthetics and is on the side of the first nonwoven fabric 3. And on both sides of the second non-woven 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 still 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. The back view of the laminated nonwoven fabric 1 is the same as the front view, and is therefore omitted.

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 the planar elastic members 31.
The planar elastic member 31 is linearly formed on both the first nonwoven fabric 3 and the second nonwoven fabric 5 in a state of being stretched 2.5 times in _{the first direction D 1 (stretching ratio: 2.5 times).} Specifically, it is adhered with an adhesive (not shown) coated 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) are in the first thickness direction (not shown). ), And the first non-woven fabric side folds 21 extending continuously in the direction parallel to the second direction D _{2 are formed.}
Further, 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 low basis weight portions 13 in the thickness direction (not shown) are in the second thickness direction (FIG. The second non-woven fabric side folds 23 are formed so as to project in (not shown) and _{continuously extend in a direction parallel to the second direction D 2.}

The laminated nonwoven fabric 1 according to the third embodiment has excellent adhesiveness and breathability for the same reason as the laminated nonwoven fabric 1 according to the first embodiment, and is less likely to come into contact with the adhesive on the surface on the first nonwoven fabric 3 side.
Further, the laminated nonwoven fabric 1 according to the third embodiment is excellent in aesthetics.

FIG. 12 is a diagram for explaining the conventional laminated nonwoven fabric 101. 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 nonwoven fabric composed of spunbonded 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 nonwoven fabric composed of a spunbonded nonwoven fabric and a uniform nonwoven fabric composed of a spunbonded 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 nonwoven fabric, the first nonwoven fabric side folds 21 and the second nonwoven fabric side folds 23 are in a contracted state. It extends in a direction deviated from the second direction D _{2, and is inferior in aesthetics.}

<Fourth Embodiment>
FIG. 8 is a diagram for explaining a laminated nonwoven fabric 1 according to still 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. The back view of the laminated nonwoven fabric 1 is the same as the front view, and is therefore omitted.
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 the 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 (adhesive) is applied to both the first nonwoven fabric 3 and the second nonwoven fabric 5. (Not shown).

The laminated nonwoven fabric 1 according to the fourth embodiment has excellent adhesiveness and breathability for the same reason as the laminated nonwoven fabric 1 according to the third embodiment, and touches the adhesive on both the first nonwoven fabric 3 side and the second nonwoven fabric 5 side. Hateful.
Further, the laminated nonwoven fabric 1 according to the fourth embodiment is excellent in aesthetics.

The laminated nonwoven fabric of the present disclosure is a laminated nonwoven fabric for absorbent articles which has a first direction, a second direction, and a thickness direction orthogonal to each other and is expandable and contractible 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 tsubo having an alternating structure having a high basis weight portion and a low basis weight portion having a lower basis weight than the high basis weight portion in the first direction. It is a non-woven fabric.
In addition, in this specification, in order to distinguish from "non-uniform basis weight non-woven fabric", a non-uniform fabric having no high basis weight portion and a low basis weight portion having a lower basis weight than the high basis weight portion is referred to as "uniform". It may be referred to as "basis weight non-woven fabric". The unevenness of the non-woven fabric does not correspond to the high basis weight portion and the low basis weight portion.

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

When the first non-woven fabric and / or the second non-woven fabric is a non-woven fabric having a non-woven fabric, the first non-woven fabric and / or the second non-woven fabric as the non-woven fabric having a non-woven fabric is heat-fused including heat-sealing fibers. It is preferably a non-woven fabric. As a result, the low basis weight portion also tends to have a predetermined strength, and the laminated nonwoven fabric tends to have excellent strength in the first direction and the second direction. Examples of the heat-bondable nonwoven fabric include air-through nonwoven fabrics and spunbonded nonwoven fabrics, and spunbonded nonwoven fabrics are preferable. 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 is a non-woven fabric with a non-woven fabric, the first nonwoven fabric and / or the second nonwoven fabric as the non-woven fabric with a non-woven fabric can be manufactured as follows.
The air-through nonwoven fabric as the non-woven fabric having a non-uniform basis weight can be produced, for example, by the methods described in JP-A-2008-002034, JP-A-2008-025078 and the like.

The spunbonded nonwoven fabric as the non-woven fabric having a non-uniform basis weight can be produced, for example, according to the method described in JP-A-2017-20803. Specifically, the first nonwoven fabric 3 in the first embodiment extends in the transport direction MD as shown in FIG. 9, and is arranged apart from the cross-direction CD orthogonal to the transport direction MD. , Can be manufactured using a filter belt 201 having a plurality of closures 203.

In the laminated nonwoven fabric of the present disclosure, each of the non-woven fabric having a uniform basis weight and the nonwoven fabric having a uniform basis weight may or may not have a through hole, but does not have a through hole. Is preferable. This is because when the laminated nonwoven fabric has through holes, the user may come into contact with the adhesive through the through holes.

^{Each of the first non-woven fabric and the second non-woven fabric is preferably 5 to 50 g / m 2} , more preferably 7 to 40 g / m ² , and further, regardless of whether the non-woven fabric is a non-woven fabric or a non-woven fabric having a uniform basis weight. It can preferably have a basis weight of 10 to ^{30 g / m 2.} This is from the viewpoint of the effect of the present disclosure.
When each of the first nonwoven fabric and the second nonwoven fabric is a non-woven fabric having a non-uniform basis weight, the above-mentioned basis weight means an average basis weight.

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

In general, when the elastic member is a planar elastic member, the laminated nonwoven fabric is less likely to have dense and aesthetically pleasing folds in a stretched state as compared with the case where the elastic member 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, it is easy to have a dense and aesthetically pleasing fold portion in a contracted state.

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

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

When the laminated nonwoven fabric of the present disclosure is used, for example, as a waist gather forming member for forming a 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, for example, a fit gather forming member for forming a fit gather of a disposable diaper, 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.
When the elastic member is a planar elastic member, the planar elastic member may be coated with an adhesive on the entire surface by a curtain spray or the like and adhered to the first nonwoven fabric and the second nonwoven fabric with the adhesive. good. When the elastic member is a planar elastic member, the adhesive is dot-shaped or linear (for example, spiral-shaped, Ω-shaped, Z-shaped, patterned, etc.) in the first direction and / or The planar elastic member or the first nonwoven fabric and the second nonwoven fabric can be coated intermittently in the second direction, and the planar elastic member can be adhered to the first nonwoven fabric and the second nonwoven fabric. As a result, the laminated non-woven fabric is excellent in breathability 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, and the linear elastic member can be adhered to the first nonwoven fabric and the second nonwoven fabric. Then, the adhesive is dot-shaped or linear (for example, spiral-shaped, Ω-shaped, Z-shaped, patterned, etc.), intermittently in the first direction and / or the second direction, and the first non-woven fabric and / or the second. The non-woven fabric can be coated and the linear elastic member can be adhered to the first non-woven fabric and the second non-woven fabric.
In the laminated nonwoven fabric of the present disclosure, the first nonwoven fabric and the second nonwoven fabric may not be bonded, and may be bonded, for example, bonded with an adhesive.

In the laminated nonwoven fabric of the present disclosure, the non-woven fabric having a non-uniform basis weight alternates between the high basis weight portion and the low basis weight portion having a lower basis weight than the high basis weight portion in the first direction. The alternating structure having) may be possessed in a specific region in the second direction, and may be possessed in any region (that is, all regions) in the second direction.
When the non-uniform basis weight nonwoven fabric has the above-mentioned alternating structure in an arbitrary region in the second direction, the effect of the present disclosure can be more easily exhibited.

In the laminated nonwoven fabric of the present disclosure, it is preferable that the high basis weight portion of the non-uniform basis weight nonwoven fabric extends in the direction along the second direction. As a result, the laminated nonwoven fabric has excellent adhesiveness.
Further, it is preferable that the low basis weight portion extends in a direction along the second direction. As a result, the laminated non-woven fabric is excellent in aesthetics.

In the laminated nonwoven fabric of the present disclosure, the high basis weight portion and the low basis weight portion of the non-uniform basis weight non-woven fabric are respectively oriented in a direction along a second direction (preferably 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 that are extended. It should be noted that 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 orthogonal to the direction along the second direction (preferably, a direction parallel to the first direction). ) Are alternately arranged. As a result, the laminated non-woven fabric is excellent in aesthetics and breathability.

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

FIG. 10A is a diagram for explaining a non-uniform nonwoven fabric 301 having a linear and plurality of linear high basis weight portions 303 and a linear and plurality of linear low basis weight portions 305. be. Each of the linear and plurality of linear high basis weight portions 303 and each of the linear and plurality of linear low basis weight portions 305 have a linear axis line A and are orthogonal to the axis line A. They are arranged alternately in the direction of the tsubo. Further, the plurality of linear high basis weight portions 303 are arranged in a direction orthogonal to the axis A at a _{predetermined linear high basis weight portion pitch P 2.} The area occupied by the plurality of linear high basis weight portions 303 is represented by a dot pattern.

FIG. 10B is a diagram for explaining a non-uniform nonwoven fabric 301 having a curved, linear high basis weight portion 303 and a curved line, a plurality of linear low basis weight portions 305. be. Each of the curved, linear high-basis portion 303 and each of the curved, linear low-basis portion 305 has a linear axis A and is orthogonal to the axis A. They are arranged alternately in the direction of the tsubo. 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 nonwoven fabric 301 having a zigzag-shaped, plurality of linear high basis weight portions 303 and a zigzag-like, plurality of linear low basis weight portions 305. be. Each of the zigzag-shaped, plurality of linear high basis weight portions 303 and each of the zigzag-shaped, plurality of linear low basis weight portions 305 have a linear axis A and are orthogonal to the axis line A. They are arranged alternately in the direction of the tsubo. 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 described above can extend in a direction along the second direction, and preferably in a direction parallel to the second direction. Further, the direction orthogonal to the axis A can be extended in a direction orthogonal to the direction along the second direction, and preferably can be extended in a direction parallel to the first direction.

It is preferable that the plurality of linear high basis weight portions are arranged in a direction orthogonal to the axis line (direction orthogonal to the direction along the first direction) at a predetermined linear high basis weight portion pitch.
The linear high basis weight partial 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. As a result, the laminated non-woven fabric tends to be aesthetically pleasing.

When the elastic member is a plurality of linear elastic members, the linear high basis weight partial pitch is, for example, preferably 0.2 to 4.0 times the elastic member pitch of the plurality of linear elastic members. , More preferably in the range of 0.4 to 3.0 times, and even more preferably in the range of 0.6 to 2.5 times. As a result, the laminated non-woven fabric tends to be aesthetically pleasing.

In the laminated nonwoven fabric of the present disclosure, at least one of the first nonwoven fabric and the second nonwoven fabric is the above-mentioned non-woven fabric having a non-woven fabric, and both the first nonwoven fabric and the second nonwoven fabric are the above-mentioned non-woven fabric having a non-woven fabric. You may. This is from the viewpoint of the effect of the present disclosure.

Further, when both the first nonwoven fabric and the second nonwoven fabric are the above-mentioned non-woven fabric having a non-woven fabric, the high basis weight portion and the low basis weight portion of the first nonwoven fabric and the high basis weight of the second nonwoven fabric. The portion and the low basis weight portion may have the same shape or may have different shapes.
Further, when the high basis weight portion and the low basis weight portion of the first non-woven fabric and the high basis weight portion and the low basis weight portion of the second non-woven fabric have the same shape, the height of the first non-woven fabric is high. The basis weight portion and the high basis weight portion of the second non-woven fabric may or may not be arranged so as to overlap each other in the thickness direction.

The laminated nonwoven fabric of the present disclosure is for an absorbent article, and examples of the absorbent article include disposable diapers, sanitary shorts-type napkins, disposable shorts and the like.
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 fit gathers, and the like.

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

Hereinafter, the present disclosure will be described with reference to examples, but the present disclosure is not limited to these examples.
[Example 1]
Under the following conditions, the laminated non-woven fabric No. 1 was manufactured. Laminated non-woven fabric No. The image of the first non-woven fabric side of No. 1 is shown in FIG. In addition, laminated non-woven fabric No. 1 corresponds to the laminated nonwoven fabric 1 according to the first embodiment, but the type of the nonwoven fabric is different.
[First non-woven fabric]
-Type: Spun-bonded non-woven fabric (non-woven fabric with non-uniform basis weight, average basis weight: 15 g / m ² )
・ Linear high basis weight partial pitch: 4.9 mm
[Second non-woven fabric]
-Type: Spunbond non-woven fabric (uniform basis weight non-woven fabric, basis weight: 15 g / m ² )
[Elastic member]
-Type: Linear elastic member, Spandex 470 Dtex
・ Elastic member pitch: 5.0 mm
・ Stretching ratio: 2.0 times

[Example 2]
Under the following conditions, the laminated non-woven fabric No. 2 was manufactured. Laminated non-woven fabric No. The image of the first non-woven fabric side of No. 2 is shown in FIG. In addition, laminated non-woven fabric No. 2 corresponds to the laminated nonwoven fabric 1 according to the third embodiment, but the type of the nonwoven fabric is different.
[First non-woven fabric]
-Type: Spun-bonded non-woven fabric (non-woven fabric with non-uniform basis weight, average basis weight: 15 g / m ² )
・ Linear high basis weight partial pitch: 4.9 mm
[Second non-woven fabric]
-Type: Spunbond non-woven fabric (uniform basis weight non-woven fabric, basis weight: 15 g / m ² )
[Elastic member]
-Type: Planar elastic member (TPU / PO composite stretchable non-woven fabric, basis weight: 60 g / m ² )
* TPU: Thermoplastic polyurethane resin
* PO: Polyolefin resin, draw ratio: 2.5 times

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

[Comparative Example 2]
Under the following conditions, the laminated non-woven fabric No. 4 was manufactured. Laminated non-woven fabric No. The image of the first non-woven fabric side of No. 4 is shown in FIG. In addition, laminated non-woven fabric No. Reference numeral 3 corresponds to the laminated nonwoven fabric 101 shown in FIG.
[First non-woven fabric]
-Type: Spunbond non-woven fabric (uniform basis weight non-woven fabric, basis weight: 15 g / m ² )
[Second non-woven fabric]
-Type: Spunbond non-woven fabric (uniform basis weight non-woven fabric, basis weight: 15 g / m ² )
[Elastic member]
-Type: Planar elastic member (TPU / PO composite stretchable non-woven fabric, basis weight: 60 g / m ² )
・ Stretching ratio: 2.5 times

1 Laminated non-woven fabric 3 1st non-woven fabric 5 2nd non-woven 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 1st non-woven fabric side fold 23 2nd Non-woven fabric side folds 31 Planar elastic member D ₁ 1st direction D ₂ 2nd direction T Thickness direction

Claims (12)

A laminated non-woven fabric for absorbent articles that has a first direction, a second direction, and a thickness direction that are orthogonal to each other and that can expand and contract in the first direction.
The laminated nonwoven fabric 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 tsubo having an alternating structure having a high basis weight portion and a low basis weight portion having a lower basis weight than the high basis weight portion in the first direction. It is a non-woven fabric,
The elastic member is adhered to the first nonwoven fabric and the second nonwoven fabric with an adhesive.
The laminated non-woven fabric, characterized in that. The laminated nonwoven fabric according to claim 1, wherein the high basis weight portion extends in a direction along a second direction. The laminated nonwoven fabric according to claim 1 or 2, wherein the low basis weight portion extends in a direction along a second direction. A plurality of linear high basis weight portions and a plurality of linear low basis weight portions in which the laminated nonwoven fabric extends the high basis weight portion and the low basis weight portion in a direction along a second direction, respectively. Prepared as a part,
Claims 1 to 1, 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 orthogonal to a direction along a second direction. The laminated nonwoven fabric according to any one of 3. The laminated nonwoven fabric according to claim 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. 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 dotted or linear and is intermittently coated in the first direction and / or the second direction. The laminated nonwoven fabric according to any one of claims 1 to 7, wherein the non-woven fabric having a non-uniform basis weight is a heat-sealing nonwoven fabric containing heat-sealing fibers. The laminated nonwoven fabric according to claim 8, wherein the heat-fused nonwoven fabric is a spunbonded nonwoven fabric. The laminated nonwoven fabric according to any one of claims 1 to 9, wherein the non-woven fabric having a non-uniform basis weight does not have a through hole. 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 the non-woven fabric having a non-uniform basis weight. An absorbent article comprising the member made of the laminated nonwoven fabric according to any one of claims 1 to 11.

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