JPWO2018020688A1 - Patent application title: Laminated nonwoven fabric for liquid permeable sheet of absorbent article, and use of the laminated nonwoven fabric for liquid permeable sheet of absorbent article - Google Patents

Abstract

An object of the present disclosure is to provide a laminated nonwoven fabric for a liquid-permeable sheet of an absorbent article, which is excellent in liquid absorbency and softness. The laminated nonwoven fabric of the present disclosure has the following configuration. A laminated nonwoven fabric (1) for a liquid-permeable sheet (103) of an absorbent article (101), comprising a first nonwoven fabric (7) and a second nonwoven fabric (17), the laminated nonwoven fabric (1) comprising A plurality of projections (25) projecting upwards (TU), each having a top (27) and a side wall (29), and a plurality of recesses (31), each of which is embossed A portion including a portion (41), wherein each of the plurality of convex portions (25) is composed of a first non-woven fabric portion (8) composed of the first non-woven fabric (7) and a second non-woven fabric (17) And the first upper surface (9) of the first nonwoven portion (8) protrudes upward (TU), and each of the plurality of projections (25) % Of planarly oriented fibers at the top (27) and more than 50% of the side walls Layered nonwoven fabric characterized by having a ratio of the thickness direction oriented fibers in (29) (1).

Description

  The present disclosure relates to a laminated nonwoven fabric for a liquid permeable sheet of an absorbent article, as well as the use of the laminated nonwoven fabric for a liquid permeable sheet of an absorbent article.

  As a non-woven fabric for a liquid-permeable sheet of an absorbent article, a non-woven fabric having a plurality of recesses and protrusions having excellent air permeability etc. is known, and non-woven fabrics produced by various methods, for example, a pair of gear rolls There is known a method of forming a concavo-convex shape on the first sheet through one sheet, and bonding the first sheet having the concavo-convex shape to the second sheet, and a nonwoven fabric produced by the method.

  For example, in Patent Document 1, the first sheet and the second sheet are partially joined to form a large number of joined portions, and the first sheet has a convex portion formed in a portion other than the joined portion. Manufacturing a composite sheet, wherein at least one of the two sheets uses a bulk recovery sheet whose bulk is recovered by heat treatment, and the first and second rolls having tooth grooves meshing with each other on the peripheral surface portion are rotated. The first sheet is supplied to the meshing portion while the first sheet is kept along the circumferential surface of the first roll and moved from the meshing portion, and then the second sheet is transferred to the first sheet. When the sheet is supplied so as to overlap and the two sheets are partially joined and compounded, the opposite net surface of the bulk recoverable sheet is made to be the opposite side to the overlapping sheet, and before the two sheets are joined. Or after bonding The method of producing a composite sheet is subjected to heat treatment in the bulk recoverability sheet is described.

The special floor 2008-155602 gazette

In the method of producing the composite sheet described in Patent Document 1, as described in the paragraph [0047] and the like, the void portion of the convex portion formed in the conventional production method is filled with fluffed fibers. The composite sheet of Patent Document 1 still has voids in the convex portions as shown in FIG. 1 (b), although the purpose is to enhance the liquid absorbability and the like. When the convex portion has a void portion, the permeation of the liquid tends to be inhibited, and the composite sheet of Patent Document 1 has room for improvement from the viewpoint of liquid absorption.
Accordingly, the present disclosure aims to provide a laminated non-woven fabric for a liquid-permeable sheet of an absorbent article, which is excellent in liquid absorbency and softness.

  The present disclosures are liquid permeable of an absorbent article having a thickness direction including upper and lower sides and a planar direction, and including a first non-woven fabric and a second non-woven fabric disposed above the first non-woven fabric. It is a lamination nonwoven fabric for sex sheet, and the above-mentioned lamination nonwoven fabric is a plurality of convex parts which project upwards, and that each has a top and a side wall part, it is a plurality of crevices, and each of them is A first non-woven fabric portion including an embossed portion of a first non-woven fabric and a second non-woven fabric, each of the plurality of convex portions being formed of a first non-woven fabric, and a first non-woven fabric portion including a first upper surface and a first lower surface; A second non-woven fabric portion having a second upper surface and a second lower surface and including a second non-woven fabric portion constituting the top and the side wall portion, wherein a first upper surface of the first non-woven fabric portion protrudes upward; And each of the plurality of convex portions is 50 Ultra's found a ratio of fibers oriented in the planar direction in the top, 50 percent, the multilayer nonwoven fabric characterized by having a ratio of fibers oriented in the thickness direction of the side wall portion.

  The laminated nonwoven fabric for a liquid-permeable sheet of the absorbent article of the present disclosure is excellent in liquid absorbability and softness.

FIG. 1 is a perspective view of a laminated non-woven fabric 1 for a liquid-permeable sheet of an absorbent article according to a first embodiment. FIG. 2 is a partial cross-sectional view of the laminated nonwoven fabric 1 in the II-II cross section of FIG. FIG. 3 is a front view of the laminated nonwoven fabric 1. FIG. 4 is a rear view of the laminated nonwoven fabric 1. FIG. 5 is a figure for demonstrating the use to the liquid-permeable sheet 103 of the absorbent article 101 of the laminated nonwoven fabric 1 according to 1st Embodiment. 6 is a partial cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a view for explaining the laminated nonwoven fabric 1 according to the second embodiment. FIG. 8 is a view for explaining the laminated nonwoven fabric 1 according to the third embodiment. FIG. 9 is a view for explaining the laminated nonwoven fabric 1 according to the fourth embodiment. FIG. 10 is a view schematically showing a manufacturing apparatus 201 of the laminated nonwoven fabric 1. FIG. 11 is a view schematically showing the first roll 205, the second roll 208, and the bonding roll 215 of the manufacturing apparatus 201. As shown in FIG. FIG. 12 is a diagram schematically illustrating the manufacturing process of the laminated nonwoven fabric 1. FIG. 13 is a diagram schematically illustrating the manufacturing process of the laminated nonwoven fabric 1. FIG. 14 is a diagram schematically illustrating the manufacturing process of the laminated nonwoven fabric 1.

[Definition]
・ "Upper" and "Down"
As used herein, “upper” and “lower” mean the direction from the lower surface to the upper surface and the direction from the upper surface to the lower surface in the thickness direction of the laminated nonwoven fabric of the present disclosure, respectively. The upper surface and the lower surface of the laminated nonwoven fabric are respectively surfaces constituted by the second nonwoven fabric and the first nonwoven fabric, and the upper surface and the lower surface of the laminated nonwoven fabric are respectively the second upper surface and the first nonwoven fabric of the second nonwoven fabric portion Including a first lower surface of the portion.

・ "Convex" and "concave"
In the present specification, the “convex portion” and the “concave portion” are sectioned by a plane parallel to the thickness direction of the laminated nonwoven fabric. The recess is composed of an embossed portion. In addition, when the recess extends in a predetermined direction (for example, in the case of a groove), the embossed portion can be disposed continuously or intermittently in the predetermined direction, and the embossed portions disposed intermittently The area between the embossed portions of is also included in the recess. The projection projects upward and comprises a top and a side wall.

・ "Crest" and "sidewall" related to the convex part
As used herein, each of the "tops" and "sidewalls" of the projections is formed from the second nonwoven portion. The “top” and “sidewall” of the projection are intermediate between the highest point and the lowest point of the second non-woven fabric portions of the projection, and are parallel to the plane direction It is divided by the middle plane. In other words, the top of the protrusion means a portion of the second non-woven fabric portion included in the height between the vertex and the intermediate surface, and the side wall portion of the protrusion is the intermediate surface of the second non-woven fabric portion Also means parts that are low and higher than the lowest point.
To explain with reference to FIG. 2, the intermediate surface 57, the apex 53 of the convex portion 25, located in the middle of the height difference D _P between the lowest point 55 of the recess, the top portion 27 of the convex portion 25, the second The area of the non-woven fabric portion 18 between the apex 53 and the intermediate surface 57 is meant, and the side wall 29 of the convex portion 25 is lower than the intermediate surface 57 and higher than the lowest point 55 of the second non-woven fabric portion 18. Means area.

・ "1st top" and "1st side wall part" regarding the 1st nonwoven fabric part
In the present specification, the "first top" and the "first side wall" of the first nonwoven fabric portion are the height difference of the first upper surface of the first nonwoven fabric portion, that is, the first vertex which is the highest point of the first upper surface. And a first lowest point which is the lowest point of the first upper surface, and is divided by a first intermediate plane parallel to the plane direction. In other words, the first top portion of the first non-woven fabric portion means a region included in the height between the first vertex and the second intermediate surface in the first non-woven fabric portion, and the first side wall portion of the first non-woven fabric portion Means a region of the first nonwoven portion lower than the first intermediate surface and higher than the lowest point.

Referring to FIG. 2, the first intermediate surface 61 is located in the middle of the height difference _DF between the first apex 59 of the first upper surface 9 and the first lowest point 63 of the first upper surface 9, The first top portion 13 of the first non-woven fabric portion 8 means a region between the first vertex 59 and the first intermediate surface 61 in the first non-woven fabric portion 8, and the first side wall portion 15 of the first non-woven fabric portion 8 is This means an area of the first non-woven fabric portion 8 which is lower than the first intermediate surface 61 and higher than the lowest point 141.

・ "Solid" concerning the convex part
In the present specification, when the maximum distance between the first upper surface of the first non-woven fabric portion of the convex portion and the second lower surface of the second non-woven fabric portion is 5% or less of the height of the convex portion, the convex portion Is defined as "solid". The solid projections are preferably a first upper surface of the first non-woven portion and a second non-woven portion of the projections preferably at most 3%, and more preferably at most 1% of the height of the projections. It has a maximum distance between it and the second lower surface.

・ "Void part" about convex part
The "void" means a space formed between the first upper surface of the first non-woven fabric portion of the projection and the second lower surface of the second non-woven fabric portion. The solid convex portion does not have a void (the maximum distance between the first upper surface of the first non-woven portion of the convex portion and the second lower surface of the second non-woven portion is 0, ie, the height of the convex portion The maximum distance between the first upper surface of the first non-woven fabric portion of the convex portion and the second lower surface of the second non-woven fabric portion, the height of the convex portion More than 0% and not more than 5% of In addition, it is preferable that a convex part does not have a space | gap part from a liquid absorbing viewpoint.

The present disclosure relates to the following aspects.
[Aspect 1]
A laminated nonwoven fabric for a liquid-permeable sheet of an absorbent article, having a thickness direction including upper and lower portions, and a planar direction, comprising a first nonwoven fabric and a second nonwoven fabric disposed above the first nonwoven fabric. And
The laminated nonwoven fabric is a plurality of convex portions projecting upward, each having a top and a side wall portion, and a plurality of concave portions, each of which is an embossed portion of the first nonwoven fabric and the second nonwoven fabric And one with
Each of the plurality of projections is composed of a first non-woven fabric, and is composed of a first non-woven fabric portion having a first upper surface and a first lower surface, and a second non-woven fabric, and has a second upper surface and a second lower surface. And a second non-woven fabric portion forming the side wall portion,
The first upper surface of the first non-woven fabric portion projects upward, and each of the plurality of projections has a ratio of more than 50% of the fibers oriented in the planar direction at the top and more than 50%. A ratio of fibers oriented in the thickness direction in the side wall portion,
The above laminated nonwoven fabric characterized in that.

  In the laminated nonwoven fabric described above, since each of the plurality of projections includes the first nonwoven fabric portion having the predetermined shape and the second nonwoven fabric portion having the predetermined shape, the laminated nonwoven fabric has an upper surface (a second nonwoven fabric portion Due to the shapes of the first non-woven fabric portion and the second non-woven fabric portion when receiving a pressing force in the thickness direction from the second upper surface) (hereinafter sometimes referred to as “when laminated nonwoven fabric is pressed in”) And laminated non-woven fabrics are excellent in cushioning properties. In addition, when the convex portion is solid, the liquid that has reached the upper surface (the second upper surface of the second non-woven fabric portion) of the laminated non-woven fabric can be rapidly delivered from the second non-woven fabric portion to the first non-woven fabric portion And, even when the convex portion is not solid (that is, when the convex portion has a void), when the laminated nonwoven fabric is pushed in, the first upper surface of the first nonwoven fabric portion protruding upward, and the first (2) The second lower surface of the non-woven fabric portion comes into contact, and the void easily disappears, and the liquid that has reached the upper surface of the laminated non-woven fabric can be rapidly delivered from the second non-woven fabric portion to the first non-woven fabric portion. The non-woven fabric is excellent in liquid absorbability.

In each of the second non-woven fabric portions of the plurality of convex portions of the laminated non-woven fabric, the crests and the side wall portions are fibers that are more than 50% oriented in the planar direction at the crests (hereinafter referred to as “oriented in the planar direction Fibers, which may be referred to as “planar direction oriented fibers”, and fibers that are oriented in the thickness direction of the side wall portion by more than 50% (hereinafter, “fibers oriented in the thickness direction”) Since it may be referred to as “a thickness direction oriented fiber”, the top of the convex portion is excellent in smoothness due to the planar direction oriented fiber, and the thickness direction oriented fiber of the side wall portion Due to, the convex portion is excellent in cushioning properties.
As mentioned above, the said laminated | stacked nonwoven fabric is excellent in liquid absorbency and the softness resulting from a cushioning feeling and smoothness.

[Aspect 2]
The laminated non-woven fabric according to aspect 1, wherein in the second non-woven fabric portion of each of the plurality of convex portions, the fineness of the fibers of the second upper surface is lower than the fineness of the fibers of the second lower surface.
The fineness of the fibers of the second upper surface is lower than the fineness of the fibers of the second lower surface in the second nonwoven fabric portion of each of the plurality of convex portions of the laminated nonwoven fabric, and therefore the fineness of the second upper surface and the fineness of the second lower surface Due to the difference, the top of the convex portion is excellent in smoothness, and the convex portion is excellent in cushioning feeling.

[Aspect 3]
The laminated nonwoven fabric according to aspect 1 or 2, wherein in each of the plurality of convex portions, the fiber density of the first nonwoven fabric portion is higher than the fiber density of the second nonwoven fabric portion.
In the laminated nonwoven fabric described above, since each of the plurality of projections includes the first nonwoven fabric portion having a high fiber density and the second nonwoven fabric portion having a low fiber density, the laminated nonwoven fabric has cushioning properties when the laminated nonwoven fabric is pressed. Excellent. Moreover, since the laminated nonwoven fabric can draw in the liquid that has reached the upper surface thereof from the second nonwoven fabric portion of the convex portion to the first nonwoven fabric portion using the fiber density difference, it is excellent in liquid absorbability of the liquid.

[Aspect 4]
The laminated nonwoven fabric according to any one of aspects 1 to 3, wherein at least a part of the plurality of convex portions is solid.

  In the laminated non-woven fabric, at least a part of the plurality of convex portions is solid, so when there is no gap between the first upper surface of the first non-woven fabric portion and the second lower surface of the second non-woven fabric portion, That is, when the convex portion does not have the void portion, the laminated nonwoven fabric can rapidly deliver the liquid that has reached the upper surface thereof from the second nonwoven fabric portion to the first nonwoven fabric portion. In addition, when there is a gap between the first upper surface of the first nonwoven fabric portion and the second lower surface of the second nonwoven fabric portion, that is, when the convex portion has a gap, the laminated nonwoven fabric is pressed. At the same time, since the first upper surface of the first non-woven fabric portion and the second lower surface of the second non-woven fabric portion are in contact and the gap can disappear easily, the laminated non-woven fabric reaches the upper surface of the laminated non-woven fabric The liquid thus obtained can be quickly delivered from the second non-woven fabric portion to the first non-woven fabric portion, and the laminated non-woven fabric is excellent in liquid absorbability.

[Aspect 5]
The laminate according to any one of Aspects 1 to 4, wherein the laminated nonwoven fabric further includes an adhesive layer between the first nonwoven fabric portion and the second nonwoven fabric portion in at least a part of the plurality of convex portions. Non-woven fabric.

  The laminated non-woven fabric further includes an adhesive layer between the first non-woven fabric portion and the second non-woven fabric portion in at least a part of the plurality of convex portions, so that even when the convex portion has a void, When the laminated non-woven fabric is pressed, the void portion of the convex portion is easily lost easily. In addition, when the laminated non-woven fabric is used as a liquid-permeable sheet of an absorbent article, a void is unlikely to be formed in the convex portion even when a twist or the like is added. As a result, the laminated non-woven fabric can be excellent in liquid absorbability and softness for a long time.

[Aspect 6]
The laminated nonwoven fabric according to any one of Aspects 1 to 5, wherein the first nonwoven fabric is an air through nonwoven fabric.
In the laminated nonwoven fabric, since the first nonwoven fabric is an air-through nonwoven fabric, when the laminated nonwoven fabric is used as a liquid-permeable sheet of the absorbent article, the shape of the first nonwoven fabric portion, particularly the shape projecting upward is dry It is easy to hold at both time and wet time. As a result, the said laminated nonwoven fabric can be excellent in liquid absorbency and softness.

[Aspect 7]
The laminated non-woven fabric according to any one of aspects 1 to 6, wherein the second non-woven fabric is an air through non-woven fabric arranged such that the second upper surface of the second non-woven fabric portion is a net surface.
In the laminated non-woven fabric, the second non-woven fabric is an air-through non-woven fabric disposed such that the second upper surface of the second non-woven fabric portion is the net surface, so the upper surface of the convex portion (the second upper surface of the second non-woven fabric) Nonwoven fabric is excellent in smoothness.

[Aspect 8]
A first non-woven fabric portion of at least a portion of the plurality of projections comprising a first apex and a first side wall, wherein the ratio of fibers oriented in the planar direction at the first apex is greater than 50%; The laminated nonwoven fabric according to any one of aspects 1 to 7, having a percentage of fibers oriented in the thickness direction in the first side wall portion of more than%.
In the first non-woven fabric portion of at least a portion of the plurality of projections of the laminated non-woven fabric, since the first top and the first side wall each contain a specific amount of planar orientation fibers and thickness orientation fibers, the projections Therefore, the laminated nonwoven fabric is excellent in cushioning properties.

[Aspect 9]
The laminated nonwoven fabric according to any one of Aspects 1 to 8, wherein each of the plurality of projections is a ridge extending in a predetermined direction.
In the laminated nonwoven fabric, since each of the plurality of projections is a ridge extending in a predetermined direction, the laminated nonwoven fabric is excellent in smoothness in the predetermined direction.

[Aspect 10]
Each of the plurality of recesses is a groove extending along the predetermined direction between two adjacent ridges, and the groove is intermittently arranged along the predetermined direction. The laminated nonwoven fabric according to aspect 9, comprising a part.
In the laminated nonwoven fabric, each of the plurality of concave portions is a groove portion, and the groove portion includes an embossed portion arranged intermittently, so the laminated nonwoven fabric is excellent in softness.

[Aspect 11]
The laminated nonwoven fabric according to any one of Aspects 1 to 10, wherein the first lower surface of the first nonwoven fabric portion includes a flat region in at least a part of the plurality of convex portions.
In the laminated nonwoven fabric described above, since the first lower surface of the first nonwoven fabric portion includes a flat region, the laminated nonwoven fabric is a liquid-permeable sheet of the absorbent article, and the first lower surface of the first nonwoven fabric portion is the non-skin contact surface When it is used to constitute the above, it is excellent in the transferability of the liquid from the liquid-permeable sheet to the absorber.

[Aspect 12]
Use of the laminated nonwoven fabric according to any one of aspects 1 to 11 for a liquid-permeable sheet of an absorbent article.
The above use has the effects described above.

  The laminated nonwoven fabric for a liquid-permeable sheet of the absorbent article of the present disclosure, and the use of the laminated nonwoven fabric for a liquid-permeable sheet of an absorbent article will be described in detail below. Hereinafter, the "laminated non-woven fabric for a liquid-permeable sheet of an absorbent article" may be simply referred to as a "laminated non-woven fabric".

First Embodiment
FIG. 1 is a perspective view of a laminated non-woven fabric 1 for a liquid-permeable sheet of an absorbent article according to one of the embodiments of the present disclosure (hereinafter referred to as “first embodiment”). FIG. 2 is a partial cross-sectional view of the laminated nonwoven fabric 1 in the II-II cross section of FIG. FIG.3 and FIG.4 is the front view and back view of the laminated nonwoven fabric 1, respectively.

Layered nonwoven fabric 1 according to the first embodiment, the thickness direction T which includes an upper T _U and lower T _L, the planar direction P including the second direction D ₂ perpendicular to the first direction D ₁ and the first direction D ₁ Have. In addition, the laminated nonwoven fabric 1 faces the absorbent body when it is used as a liquid permeable sheet of the absorbent article, and when it is used as a liquid permeable sheet of the absorbent article when it is used as the liquid permeable sheet of the absorbent article. And the lower surface 5. Moreover, the upper surface 3 and the lower surface 5 of the laminated nonwoven fabric 1 are concepts including the 2nd upper surface 19 of the 2nd nonwoven fabric part 18, and the 1st lower surface 11 of the 1st nonwoven fabric part 8, respectively.

The laminated nonwoven fabric 1 is composed of a first nonwoven fabric 7, a second nonwoven fabric 17, and an adhesive layer 23 disposed between the first nonwoven fabric 7 and the second nonwoven fabric 17. The first nonwoven fabric 7 includes a first upper surface 9 and a first lower surface 11. The second non-woven fabric 17 includes a second upper surface 19 and a second lower surface 21.
The first lower surface 11 of the first nonwoven fabric constitutes a part of the lower surface 5 of the laminated nonwoven fabric 1 and the second upper surface of the second nonwoven fabric constitutes a part of the upper surface 3 of the laminated nonwoven fabric 1.

Layered nonwoven fabric 1 comprises a plurality of protrusions 25 protruding upward T _U, and a plurality of recesses 31. Specifically, each of the plurality of concave portions 31 is formed of an embossed portion 41 formed by continuously embossing the first nonwoven fabric 7 and the second nonwoven fabric 17 along the first direction D ₁ . .
Also, each of the plurality of convex portions 25, a ridge portion extending in the first direction D _1, and each of the plurality of recesses 31, a groove extending in the first direction D _1, the convex portion 25 (i.e., ridge) and the recess 31 (i.e., groove), but are arranged alternately in the second direction D _2.
Each of the plurality of projections 25 has a top 27 including an apex 53 and a side wall 29.

Each of the plurality of protrusions 25, which is composed of a first nonwoven fabric 7, the first nonwoven portion 8 where the first upper surface 9 is projected upward T _U, composed of the second nonwoven fabric 17, the second nonwoven portion 18 And. The first non-woven fabric portion comprises a first top 13 and a first side wall 15, and the second non-woven fabric constitutes a top 27 and a side wall 29 of the projection 25. Further, the shape of the second lower surface 21 of the second nonwoven fabric portion 18 is configured to correspond to the shape of the first upper surface 9 of the first nonwoven fabric portion 8.

  Each of the plurality of projections 25 has a ratio of planar orientation fibers in the top 27 of more than 50% and a ratio of thickness orientation fibers in the side wall 29 of more than 50%. By doing so, the top portion 27 of the convex portion 25 is excellent in smoothness due to the plane direction oriented fiber, and the convex portion 25 is excellent in cushioning property due to the thickness direction oriented fiber of the side wall portion 29 .

  Further, in the second non-woven fabric portion 18 of each of the plurality of projections 25, the fineness of the fibers of the second upper surface 19 is lower than the fineness of the fibers of the second lower surface 21. By doing so, due to the difference between the fineness of the second upper surface 19 and the fineness of the second lower surface 21, the top portion 27 of the convex portion 25 is excellent in smoothness, and the convex portion 25 is excellent in cushioning feeling.

  In each of the plurality of projections 25, the fiber density of the first non-woven fabric portion 8 is higher than the fiber density of the second non-woven fabric portion 18. By doing so, when the laminated nonwoven fabric 1 receives a force that pushes it from the upper surface 3 in the thickness direction T, the laminated nonwoven fabric 1 is excellent in cushioning properties. In addition, since the laminated nonwoven fabric 1 can draw the liquid that has reached the upper surface 3 from the second nonwoven fabric portion 18 of the convex portion 25 into the first nonwoven fabric portion 8 using the fiber density difference, the laminated nonwoven fabric 1 Excellent in liquid absorbability of liquid.

  In each of the plurality of protrusions 25, the first lower surface 11 of the first nonwoven fabric portion 8 includes a flat region. In other words, in the laminated nonwoven fabric 1, the lower surface 5 is flat except for the plurality of recesses 31 and the portions adjacent to them. By doing so, when the laminated nonwoven fabric 1 is used such that the first lower surface 11 of the first nonwoven fabric portion 8 constitutes a non-skin contact surface as a liquid permeable sheet of the absorbent article, It is excellent in the delivery property of the liquid from a sheet to an absorber, and by extension, the absorbent article is excellent in the liquid absorbability.

  In each of the plurality of projections 25, the adhesive layer 23 is disposed between the (first upper surface 9) of the first non-woven fabric portion 8 and the (second lower surface 21 of) the second non-woven fabric portion 18. Specifically, the adhesive layer 23 is intermittently disposed between the first non-woven fabric portion 8 and the second non-woven fabric portion 18 over the entire planar direction P of the convex portion 25. Further, although not shown, the adhesive layer 23 is intermittently disposed between the first non-woven fabric 7 and the second non-woven fabric 17 over the entire planar direction P of the recess 31 in each of the plurality of recesses 31 There is.

  The first non-woven fabric portion 8 has a ratio of planar orientation fibers in the first top 13 and a ratio of thickness orientation fibers in the first sidewall 15 of more than 50%. By doing so, the convex part 25 is excellent in cushioning properties.

  FIG.5 and FIG.6 is a figure for demonstrating the use to the liquid-permeable sheet 103 of the absorbent article 101 of the laminated nonwoven fabric 1 according to 1st Embodiment. Specifically, FIG. 5 is a plan view of an absorbent article 101 provided with the laminated nonwoven fabric 1 according to the first embodiment as a liquid-permeable sheet 103. 6 is a partial cross-sectional view of the absorbent article 101 taken along the line VI-VI in FIG.

As shown in FIGS. 5 and 6, the absorbent article 101 orthogonal to each other, has a longitudinal direction L, the width direction is W, the the thickness direction T which includes an upper T _U and lower T _L, In the thickness direction T, the liquid-permeable sheet 103, the absorber 105, and the liquid-impermeable sheet 111 are provided in that order. The absorber 105 is composed of an absorbent core 109 and a core wrap 107 covering the absorbent core 109.

  The absorbent article 101 includes a side sheet 121, a seal part 123 for sealing the end of the absorbent article 101, and an embossed part 125 formed by embossing the liquid-permeable sheet 103 and the absorber 105. Although it has the fixing | fixed part 127 which fixes the absorbent article 101 to clothes, since all are well-known in this technical field, detailed description is abbreviate | omitted.

As shown in FIGS. 5 and 6, the laminated nonwoven fabric 1 as the liquid-permeable sheet 103 has an upper surface 3 constituting the skin contact surface of the absorbent article 101, and a lower surface 5 is an absorbent body 105. It is placed in contact with the The layered nonwoven 1, the first direction D ₁ and the second direction D ₂ are arranged so that each corresponds to the longitudinal direction L and the width direction W of the absorbent article 101. Incidentally, the laminated nonwoven fabric 1, the thickness direction T which includes an upper T _U and lower T _L, the same concepts and their absorbent article 101.

In the absorbent article 101, the liquid-permeable sheet 103 has the effect of the above-mentioned laminated nonwoven fabric 1 as it is.
Further, in the absorbent article 101, the flat region of the lower surface 5 of the plurality of convex portions 25 of the liquid-permeable sheet 103 (laminated nonwoven fabric 1) is in contact with the absorber 105, specifically, the core wrap 107 over a wide range. Therefore, the liquid that has reached the skin contact surface of the liquid-permeable sheet 103 (laminated nonwoven fabric 1) can be rapidly delivered to the absorber 105.

Second Embodiment
FIG. 7 is a perspective view for explaining the laminated nonwoven fabric 1 according to another embodiment of the present disclosure (hereinafter, referred to as “second embodiment”).
In addition, since the lamination nonwoven fabric 1 according to 2nd Embodiment is the same as the lamination nonwoven fabric 1 according to 1st Embodiment except the part mentioned later, description is abbreviate | omitted.
Layered nonwoven fabric 1 according to the second embodiment includes a plurality of protrusions 25 protruding upward T _U, and a plurality of recesses 31. Each of the plurality of convex portions 25, a ridge portion extending in the first direction D _1, and each of the plurality of recesses 31, a groove extending in the first direction D _1, the convex portion 25 (i.e. , a ridge portion), the recess 31 (i.e., groove), but are arranged alternately in the second direction D _2.

The plurality of convex portions 25 are the same as those in the first embodiment. Each of the plurality of recesses 31 includes a first nonwoven fabric 7 and the second nonwoven fabric 17, along a first direction D _1, formed by intermittently embossing, a plurality of embossed portions 41. Further, each of the plurality of recesses 31 includes a non-embossed portion 43 between two adjacent embossed portions 41. In other words, each of the plurality of recessed portions 31 includes the plurality of embossed portions 41 and the plurality of non-embossed portions 43, and each of the plurality of embossed portions 41 and each of the plurality of non-embossed portions 43 is the first They are alternately arranged in the direction D _1.

In the laminated nonwoven fabric 1 according to the second embodiment, the first lower surface 11 of the first nonwoven fabric portion 8 includes a flat region in each of the plurality of projections 25 and a plurality of non-embossed portions in each of the plurality of recesses 31. The lower surface 5 of 43 includes a flat area. Moreover, in the laminated nonwoven fabric 1 according to the second embodiment, the lower surface 5 is flat except for the plurality of embossed portions 41 and portions adjacent to them.
Layered nonwoven fabric 1, by having the structure described above, in particular, along the first direction D _1, by including the embossed portion 41 arranged intermittently, the laminated nonwoven fabric 1 has excellent softness.

Third Embodiment
FIG. 8 is a view for explaining the laminated nonwoven fabric 1 according to another embodiment of the present disclosure (hereinafter, referred to as “third embodiment”), and is a cross-sectional view corresponding to the II-II cross section of FIG. .
In addition, since the lamination nonwoven fabric 1 according to 3rd Embodiment is the same as the lamination nonwoven fabric 1 according to 1st Embodiment except the part mentioned later, description is abbreviate | omitted.
The laminated nonwoven fabric 1 shown in the third embodiment comprises the first nonwoven fabric 7 and the second nonwoven fabric 17 and does not have an adhesive layer between the first nonwoven fabric 7 and the second nonwoven fabric 17.
.

  Each of the plurality of projections 25 comprises a first non-woven fabric portion 8 provided with a first upper surface 9 and a first lower surface 11, and a second non-woven fabric portion 18 provided with a second upper surface 19 and a second lower surface 21. In the laminated nonwoven fabric 1, each of the plurality of projections 25 includes the void 51 between the first upper surface 9 of the first nonwoven fabric portion 8 and the second lower surface 21 of the second nonwoven fabric portion 18. The void 51 is formed in a range substantially overlapping the thickness direction T with the top 27 of the second non-woven fabric portion 18 (convex portion 25) and the first top 13 of the first non-woven fabric portion 8. Each of the plurality of convex portions 25 has the above-described specific void portion 51, whereby the cushioning property can be enhanced while maintaining the liquid absorbability of the laminated nonwoven fabric 1.

Fourth Embodiment
FIG. 9 is a perspective view for illustrating the laminated nonwoven fabric 1 according to another embodiment of the present disclosure (hereinafter, referred to as “fourth embodiment”).
In addition, since the lamination nonwoven fabric 1 according to 4th Embodiment is the same as that of the lamination nonwoven fabric 1 according to 1st Embodiment except the above-mentioned part, description is abbreviate | omitted.

Layered nonwoven fabric 1 according to the fourth embodiment includes a plurality of protrusions 25 protruding upward T _U, and a plurality of recesses 31. Specifically, each of the plurality of convex portions 25 has a curved shape protruding upward in the thickness direction T, specifically, a substantially square frustum shape. Also, each of the plurality of protrusions 25, in the planar direction P, intermittently in a first direction D ₁ and the second direction D _2, are arranged in a staggered manner.

Each of the plurality of recesses 31 is composed of an embossed portion 41 formed by embossing the first non-woven fabric 7 and the second non-woven fabric 17, and is surrounded by four adjacent protrusions in the planar direction P, and In the plane direction P, they are arranged in a staggered manner.
The laminated nonwoven fabric 1 according to the fourth embodiment can reduce the contact area with the user when used as a liquid permeable sheet of an absorbent article, so it is less likely to damage the skin, and the flat high-height air-permeable Excellent.

<Manufacture of laminated nonwoven fabric>
The laminated nonwoven fabric of the present disclosure is not particularly limited, and may be produced by variously combining known methods.
As an example, the laminated nonwoven fabric according to the first embodiment can be manufactured using the manufacturing apparatus 201 and the manufacturing method shown in FIGS.

  FIG. 10 is a view schematically showing a manufacturing apparatus 201 of the laminated nonwoven fabric 1. FIG. 11 is a view schematically showing the first roll 205, the second roll 208, and the bonding roll 215 of the manufacturing apparatus 201. As shown in FIG. The manufacturing apparatus 201 includes a first heat treatment apparatus 203, a first roll 205, a second roll 208, a second heat treatment apparatus 211, an adhesive application apparatus 213, and a bonding roll 215. The manufacturing apparatus 201 relates to the conveyance of the material and the like of the laminated nonwoven fabric 1 and includes the conveyance direction MD, the transverse direction CD orthogonal to the conveyance direction MD and along the conveyance surface, and the vertical direction TD orthogonal to the conveyance direction MD and the transverse direction CD Have.

In the manufacturing apparatus 201 of the laminated nonwoven fabric 1, the laminated nonwoven fabric 1 and the materials (members) constituting the laminated nonwoven fabric 1 have the first direction D ₁ , the second direction D _2, and the thickness direction T in the conveying direction, respectively. It is conveyed so as to be the same as the MD, the transverse direction CD and the vertical direction TD. Therefore, in the method of manufacturing the laminated nonwoven fabric 1, the transport direction MD, the transverse direction CD, and the vertical direction TD refer to the laminated nonwoven fabric 1 and the materials constituting the laminated nonwoven fabric 1 in the first direction D ₁ and the second direction D, respectively. It can be read as ₂ and thickness direction T.

Shown in FIG. 10, the manufacturing method of the laminated nonwoven fabric 1 has a first and bulk recovery step S _1, a shaping step S _2, the second bulk recovery step S _3, the coating step S _4, the bonding step S ₅ and.
[First Bulk Recovery Step S ₁ ]
In the first bulk recovery step S _1, performs unwound from the second material roll (not shown), a second nonwoven 301 before bulk recovery, the heat treatment for heating the first heat treatment apparatus 203, the 2 forming a non-woven fabric 17; Specifically, the first heat treatment apparatus 203 applies heat to the second non-woven fabric 301 before bulk recovery while conveying the second non-woven fabric 301 before bulk recovery in the transport direction MD, and the second non-woven fabric before bulk recovery The bulk of 301 is recovered, and the second nonwoven fabric 17 in which the bulk is recovered is formed.
In the first heat treatment apparatus 203, the second non-woven fabric 301 before bulk recovery is conveyed while adjusting the tension by nip rolls or the like respectively provided at both ends of the conveyance direction MD of the first heat treatment apparatus 203.

  As the method of the heat treatment, for example, any surface of the second non-woven fabric 301 before bulk recovery (for example, when the second non-woven fabric before bulk recovery is an air through non-woven fabric, a net contacting the transport net) There is a method of supplying hot air so that the hot air passes from the surface or both surfaces in the thickness direction of the second non-woven fabric 301 before bulk recovery.

[Forming step S ₂ ]
In shaping step S _2, and supplies the second nonwoven fabric 17, the meshing region 219 of the first roll 205 and second roll 208.
The first roll 205 is a plurality of first teeth 207a continuously extended along the transport direction MD (rotational direction) on the first outer peripheral surface 206, each of which is predetermined in the transverse direction CD The ones arranged at the pitch of. A region between two adjacent first teeth 207a forms a first recess 207b, and the plurality of first teeth 207a and the plurality of first recesses 207b alternate in the transverse direction CD. Is located in

  The second roll 208 has a plurality of second teeth 210a continuously extended along the transport direction MD (rotational direction) on the second outer circumferential surface 209, each of which is predetermined in the transverse direction CD The ones arranged at the pitch of. A region between two adjacent second teeth 210a forms a second recess 210b, and the plurality of second teeth 210a and the plurality of second recesses 210b alternate in the transverse direction CD. Is located in

As is apparent from the phantom line EL ₁ and the virtual line EL ₂ as shown in FIG. 11, the first teeth 207a and the first recess portion 207b of the first roll 205, respectively, the second recess portion 210b of the second roll 208 And the second tooth portion 210a.

  As shown in FIG. 12, the first roll 205 and the second roll 208 hold the second non-woven fabric 17 in the meshing region of the tooth portion and the groove portion of the both to shape the second non-woven fabric 17. Specifically, a plurality of first curved portions 309 protruding toward the first roll 205 and a second curved portion 311 protruding toward the second roll 208 are formed, and a shaped second nonwoven fabric is formed. Form 303.

  Specifically, in the second non-woven fabric 17, the portion between the first teeth 207 a of the first roll 205 is directed from the second lower surface 21 to the second upper surface 19 by the second teeth 210 a of the second roll 208. In other words, it is pushed toward the first outer circumferential surface 206 of the first roll 205. Thereby, a plurality of first curved portions 309 are formed in the second nonwoven fabric 17.

  In the second nonwoven fabric 17, the portion between the second tooth portions 210 a of the second roll 208 is directed from the second upper surface 19 to the second lower surface 21 by the first tooth portions 207 a of the first roll 205, that is, It is pushed out toward the 2nd outer peripheral surface 209 of 2 rolls 208. As shown in FIG. Thereby, a plurality of second curved portions 311 are formed in the second nonwoven fabric 17.

In shaping step S _2, each of the plurality of second curved portion 311, pressing the first tooth portion 207a of the first roll 205, and a second outer peripheral surface 209 of the second roll 208, compressed. Thereby, the second curved portion 311 (especially, the first tooth portion 207a of the first roll 205 and the second outer peripheral surface of the second roll 208) by thermal welding, plastic deformation or the like of the fibers constituting the second curved portion 311. It becomes easy to fix the shape of the part in contact with 209).

In shaping step S _2, each of the plurality of first curved portion 309, and a second tooth portion 210a of the second roll 208, compressed to so that it is not crushed between the first outer peripheral surface 206 of the first roll 205 Is preferred. By doing so, thermal welding, plastic deformation, and the like of the fibers constituting the first curved portion 309 do not easily occur, and the structure of the first curved portion 309 (particularly, the structure from the second lower surface 21) is hardly fixed. As a result, after the shaping step S _2, the second roll 208, when spaced from the first roll 205, the repulsive force of the fibers constituting the first curved portion 309 (or elastic force) by the like, the second nonwoven The structure of the seventeen first curved portions 309 (particularly, the structure from the second lower surface 21) can be easily returned to the state before being bitten by the second teeth 210a.

  Next, the second lower surface 21 of the shaped second non-woven fabric 303 is pulled away from the second roll 208 while maintaining the second upper surface 19 of the shaped second non-woven fabric 303 in contact with the first roll 205. At that time, as shown in FIG. 13, since the second upper surface 19 of the shaped second non-woven fabric 303 keeps in contact with the first roll 205, the curved shape of the second upper surface 19 of the first curved portion 309 is maintained. On the other hand, the second lower surface 21 of the first curved portion 309 tries to recover to the original shape, that is, to recover to the planar shape.

  The temperature of the first roll 205 is preferably a first predetermined temperature which is higher than normal temperature (for example, 25 ° C.) and lower than the melting point of the lowest melting point component of the fibers constituting the second non-woven fabric 17 . When the temperature of the first roll 205 is increased, the curved shape of the second upper surface 19 of the first curved portion 309 in the shaped second non-woven fabric 303 can be further stabilized due to the shaping effect. In addition, since heat is stored inside the shaped second nonwoven fabric 303, the second lower surface 21 is pulled away from the second roll 208, and the second lower surface 21 of the first curved portion 309 takes the original shape. During recovery, recovery due to the repulsive force (or elastic force) can be assisted by the effect of bulk recovery by heat.

  The temperature of the second roll 208 is preferably a second predetermined temperature which is equal to or higher than normal temperature and lower than the first predetermined temperature. By doing so, the shaping effect by the second roll 208 decreases, the effect of bulk recovery becomes strong, and the second lower surface 21 of the first curved portion 309 of the shaped second nonwoven fabric 303 is in the original state. Makes recovery easier.

The second roll 208 may be made of a non-conductive dielectric, such as a synthetic resin (eg, nylon). By doing so, when the shaped second non-woven fabric 303 separates from the second roll 208, it is generated by the friction between the second outer circumferential surface 209 of the second roll 208 and the shaped second non-woven fabric 303. The static electricity causes the fibers of the second lower surface 21 of the shaped second nonwoven fabric 303 to be attracted to the second roll 208. Thereby, the fibers of the second lower surface 21 of the shaped second non-woven fabric 303 rise in the direction of the second roll 208, and the second lower surface 21 of the shaped second non-woven fabric 303 is recessed or planarized smaller. Can be recovered. Thereby, in the bonding step S ₅ will be described later, and the second nonwoven 303 shaped, and a first nonwoven 307 having the adhesive layer, can be joined so as not to cause a gap between them. As a result, the plurality of convex portions 25 of the laminated nonwoven fabric 1 can be made solid, more specifically, the convex portions 25 do not have a void.
The plurality of first curved portions 309 and the plurality of second curved portions 311 finally constitute the plurality of convex portions 25 and the plurality of concave portions 31 of the laminated nonwoven fabric 1, respectively.

[Second bulk recovery step S ₃ ]
In the second bulk recovery step S _3, performs unwound from the second material roll (not shown), the first nonwoven 305 before bulk recovery, the heat treatment is heated at the second heat treatment apparatus 211, the 1 to form a non-woven fabric 7. The second heat treatment apparatus 211 is an apparatus for heat treating the sheet to bulk recover the sheet, and is similar to the first heat treatment apparatus 203. Specifically, the second heat treatment apparatus 211 applies heat to the first nonwoven fabric 305 before bulk recovery while conveying the first nonwoven fabric 305 before bulk recovery in the transport direction MD, and the first nonwoven fabric before bulk recovery The bulk of 305 is recovered to form the first non-woven fabric 7 whose bulk is recovered.
In the second heat treatment apparatus 211, the first non-woven fabric 305 before bulk recovery is conveyed while adjusting the tension by nip rolls or the like respectively provided at both ends of the conveyance direction MD of the second heat treatment apparatus 211.

[Application step S ₄ ]
In the coating step S _4, the first nonwoven fabric 7, and supplied to the adhesive application device 213, the first upper surface 9 of the first nonwoven fabric 7, an adhesive is applied in a predetermined pattern, first non-woven fabric 307 with an adhesive layer Form The predetermined pattern may be, for example, a stripe pattern having a predetermined width, which extends along the transport direction MD and is arranged at predetermined intervals in the transverse direction CD.
The said adhesive agent does not have a restriction | limiting in particular, For example, a hot-melt adhesive agent is mentioned.

[Bonding process S ₅ ]
In the bonding step S _5, a second nonwoven 303 shaped, and a first nonwoven 307 having the adhesive layer, is supplied to the junction region 221, the junction region 221, a second nonwoven 303 shaped adhesive The first non-woven fabric 307 including the layers is joined to form the laminated non-woven fabric 1.

  The bonding roll 215 has a first non-woven fabric 307 provided with an adhesive layer and a shaped first in a bonding area 221 of the bonding roll outer peripheral surface 216 and the first tooth portion 207a and the first dented portion 207b of the first roll 205. 2 Non-woven fabric 303 is sandwiched and bonded. The bonding roll 215 is disposed to face the first roll 205 at a second predetermined position different from the first predetermined position on the first outer circumferential surface 206 of the first roll 205. The bonding roll 215 is provided with pins 217 intermittently arranged on the bonding roll outer peripheral surface 216 along the transport direction MD (rotational direction) and the cross direction CD.

As is apparent from the phantom line EL ₁ and the virtual line EL ₂ as shown in FIG. 11, the pin 217 of the joint roll 215, the first tooth portion 207a of the first roll 205 is arranged so as to face each other. The pin 217 and the bonding roll outer peripheral surface 216 of the bonding roll 215, and the first tooth portion 207a and the first dented portion 207b of the first roll 205 form the second non-woven fabric 303 and the adhesive layer formed in the bonding area 221. The first lower surface 21 of the shaped second nonwoven fabric 303 is brought into close contact with the first upper surface 9 of the first nonwoven fabric 307 provided with the adhesive layer by sandwiching the first nonwoven fabric 307 provided, The first nonwoven fabric 307 including the second nonwoven fabric 303 and the adhesive layer is bonded via the adhesive layer. Further, between the pin 217 of the bonding roll 215 and the first tooth portion 207a of the first roll 205, the first non-woven fabric 307 including the shaped second non-woven fabric 303 and the adhesive layer is embossed to form the embossed portion 41 (recessed portion 31) form. The laminated nonwoven fabric 1 is manufactured by the above.

In the bonding area 221, the second upper surface 19 of the shaped second non-woven fabric 303 is maintained in contact with the first roll 205, so the shape of the second upper surface 19 of the plurality of first curved portions 309 is maintained. It is easy to be done. The shape of the second lower surface 21 of the second nonwoven 303 shaped after the shaping step S _2, since the recovered smaller indentations or planar, in the bonding step S _5, the second nonwoven 17 The entire surface of the second lower surface 21 and the entire surface of the first upper surface 9 of the first nonwoven fabric 7 can be easily joined with the adhesive layer 23 interposed therebetween.

  When the second non-woven fabric 17 is a non-woven fabric (for example, an air through non-woven fabric) manufactured by conveying on the net, the shaped second non-woven fabric 303 and the first non-woven fabric 307 including the adhesive layer are It is possible to join so that the net surface in contact with the net constitutes the second upper surface 19 and the non-net surface not in contact with the net constitutes the second lower surface 21.

The net surface tends to have a higher fiber density of the fibers that make up the nonwoven and a smooth surface than a non-net surface. As a result, after the shaping step S _2, it can maintain the shape of the second upper surface 19 of the first bending portion 309 stably.
On the other hand, in the second lower surface 21 of the first curved portion 309, since the fiber density is low, the bulk is largely recovered, the elastic deformation easily occurs in the thickness direction T, and few fibers cause plastic deformation such as bending. As a result, after the shaping step S _2, the the second roll 208 from the second nonwoven 303 shaped leaves, the repulsive force of the fibers of the second lower surface 21 of the first bending portion 309 (or elastic force) The second lower surface 21 of the first curved portion 309 can be made more planar, and its surface can be fluffed. Therefore, in the laminated nonwoven fabric 1 to be formed, each of the plurality of convex portions 25 tends to be solid, and more specifically, each of the plurality of convex portions 25 is unlikely to have a void.

The above-described manufacturing method is one in which the second nonwoven fabric is shaped, and the shaped second nonwoven fabric is bonded to the first nonwoven fabric (hereinafter, may be referred to as a “forming method”).
In the art, as a method of manufacturing a laminated nonwoven fabric having a plurality of projections and a plurality of recesses (hereinafter referred to as "concave structure"), a laminated nonwoven fabric having a concavo-convex structure is manufactured by spraying a fluid onto a web. Method (hereinafter, referred to as “fluid spray method”), method of producing a laminated non-woven fabric having a concavo-convex structure by utilizing the difference in heat crimpability between the upper layer and the lower layer (hereinafter, referred to as “heat crimp method”) There is known a method of producing a laminated non-woven fabric having a concavo-convex structure by utilizing the difference in thermal extensibility between the upper layer and the lower layer (hereinafter, referred to as "thermal elongation method").

Since the shaping method can use a commercially available non-woven fabric as it is as compared with the fluid spraying method, the heat crimp method and the thermal elongation method, the non-woven fabric produced by the shaping method is advantageous in cost. It is. In addition, the shaping method is easy to obtain depending on the desired function (for example, liquid absorbability, touch feeling) of the laminated non-woven fabric to be produced as compared with the fluid spraying method, the heat crimp method and the thermal elongation method. It is advantageous in that various commercially available non-woven fabrics can be selected.
In addition, the shaping method is advantageous in that a thick (bulky) laminated non-woven fabric can be easily produced as compared with the fluid spraying method, the heat crimp method and the thermal elongation method.

<Laminated non-woven fabric of the present disclosure>
The laminated nonwoven fabric of the present disclosure is for a liquid-permeable sheet of an absorbent article, and can have a general basis weight as a liquid-permeable sheet, for example, 10 to 80 g / m ² , and preferably 20 to 20 It can have a basis weight of 50 g / m ² .

  The laminated nonwoven fabric of the present disclosure is not particularly limited to the first nonwoven fabric and the second nonwoven fabric, and is preferably 20 to 80 parts by mass and 80 to 20 parts by mass, more preferably 30 to 70 parts by mass and 70 to 30 parts Parts, and more preferably in a ratio of 40 to 60 parts by weight and 60 to 40 parts by weight (basis weight ratio). In addition, when the lamination nonwoven fabric of this indication consists only of the 1st nonwoven fabric and the 2nd nonwoven fabric, the above-mentioned "mass part" can be read as "mass%."

In the present specification, the basis weight of a sheet-like material such as a laminated non-woven fabric is measured as follows.
(1) From the sheet-like material, 10 samples of a size of 100 mm × 100 mm are collected, and the mass of each sample is measured,
(2) The basis weight of each sample is calculated by dividing the mass (g) of each sample by the area (m ² ) of each sample.
(3) Calculate the average value of the basis weights of a total of 10 samples, and adopt the average value as the basis weight.

  In this specification, the ratio of the first non-woven fabric and the second non-woven fabric is such that a cold spray or the like is sprayed on the laminated non-woven fabric to separate the first non-woven fabric and the second non-woven fabric from the laminated non-woven fabric. The basis weight of each of the first non-woven fabric and the second non-woven fabric can be calculated according to the measurement method, and the ratio can be determined from the basis weight thereof.

  In the laminated non-woven fabric of the present disclosure, each of the first non-woven fabric and the second non-woven fabric is not particularly limited as long as it is used as a liquid permeable sheet of an absorbent article. Bond non-woven fabric, point-bonded non-woven fabric, spunlace non-woven fabric, needle punched non-woven fabric, melt-blown non-woven fabric, and combinations thereof (eg, SMS etc.) and the like can be mentioned. Each of the first nonwoven fabric and the second nonwoven fabric is preferably an air through nonwoven fabric.

  The fineness of the fibers constituting each of the first nonwoven fabric and the second nonwoven fabric is not particularly limited, but is preferably 0.5 to 30.0 dtex, more preferably 0.7 to 20.0 dtex, and still more preferably 1.0. It is in the range of ~ 10.0 dtex.

In the second nonwoven fabric portion of each of the plurality of convex portions of the laminated nonwoven fabric of the present disclosure, the fineness of the fibers of the second upper surface is preferably lower than the fineness of the fibers of the second lower surface. By doing so, due to the difference between the fineness of the second upper surface and the fineness of the second lower surface, the top of the convex portion is excellent in smoothness, and the convex portion is excellent in cushioning feeling.
From this point of view, the second nonwoven fabric comprises fibers of which the second upper surface of the second nonwoven fabric portion preferably has a denier of 0.5 to 10.0 dtex, and more preferably 0.7 to 5.0 dtex, and The second lower surface of the non-woven fabric portion may be a non-woven fabric, preferably comprising fibers of a denier of 1.0 to 10.0 dtex, and more preferably 1.5 to 5.0 dtex. Also, the difference between the fineness of the second lower surface of the second nonwoven fabric portion and the fineness of the fibers of the second upper surface of the second nonwoven fabric portion is preferably 0.2 to 2.0 dtex, and more preferably 0.5 to 1 .5 dtex.

The fineness of the second upper surface and the second lower surface of the second non-woven fabric can be adjusted by stacking a plurality of webs of different fineness when producing the second non-woven fabric.
In another embodiment of the laminated nonwoven fabric of the present disclosure, the fineness of the fibers of the second upper surface is the same as the fineness of the fibers of the second lower surface in the respective second nonwoven fabric portions of the plurality of convex portions of the laminated nonwoven fabric. And in yet another embodiment, the fineness of the fibers of the second upper surface is higher than the fineness of the fibers of the second lower surface.

The second non-woven fabric is manufactured by conveying on the net during the production of the non-woven fabric, and preferably has a net surface. In the present specification, the net surface relating to the non-woven fabric means the surface that was in contact with the transport net when manufacturing the non-woven fabric.
The first non-woven fabric and the second non-woven fabric are also preferably bulk recoverable non-woven fabrics and have been subjected to bulk recovery treatment.
Examples of the bulk recovery non-woven fabric include non-woven fabrics containing heat-stretchable fibers. As said heat extensible fiber, the thing as described in Unexamined-Japanese-Patent No. 2007-182662 grade | etc., Is mentioned, for example.

  In the laminated nonwoven fabric of the present disclosure, each of the plurality of convex portions has a linear shape, that is, a longitudinal direction and a width direction in the planar direction, as shown in the first to third embodiments. Can be). In the nonwoven fabric of the present disclosure, as shown in the first to third embodiments, each of the plurality of recesses is linear (ie, having a longitudinal direction and a width direction) in the planar direction (groove portion). be able to.

  As an example in which the plurality of protrusions and the plurality of recesses are a plurality of ridges and a plurality of grooves, respectively, the plurality of ridges and a plurality of recesses extend in the first direction, respectively. The plurality of groove portions may be arranged such that each of the plurality of ridges and each of the plurality of groove portions are alternately arranged in a second direction orthogonal to the first direction. By doing so, when the user touches the laminated nonwoven fabric along the first direction, the laminated nonwoven fabric can feel smoothness.

When the plurality of projections and the plurality of recesses are a plurality of ridges and a plurality of grooves, respectively, the pitch of the plurality of ridges is preferably 1.0 to 10.0 mm, and more preferably 1. It is 5 to 7.0 mm. It is from the viewpoint of liquid permeability and cushioning feeling.
The height of each of the plurality of ridges is preferably 0.3 to 10.0 mm, and more preferably 0.5 to 5.0 mm. It is from the viewpoint of liquid absorption and cushioning. If the height of the buttocks is too high, it tends to be poor in liquid absorption, and if the height of the buttocks is too low, the cushioning feeling tends to be poor.

  Each of the plurality of grooves includes an embossed portion formed by embossing the first nonwoven fabric and the second nonwoven fabric, and is formed by embossing the first nonwoven fabric and the second nonwoven fabric with an adhesive or the like interposed therebetween. It may be an embossed portion.

In each of the plurality of groove portions, as shown in the first embodiment and the third embodiment, the embossed portions may be arranged continuously in the first direction. By doing so, when the laminated non-woven fabric is used as the liquid permeable sheet of the absorbent article, the liquid that has reached the skin contact surface of the liquid permeable sheet is easily diffused along the embossed part of the groove, As a result, since the absorber can efficiently absorb the bitter band, the liquid hardly leaks.
In each of the plurality of groove portions, the embossed portion may be intermittently arranged in the first direction. By doing so, the rigidity of the groove portion is reduced, and when the laminated non-woven fabric is used as a liquid-permeable sheet of the absorbent article, the wearer hardly feels the hardness of the absorbent article.

In the laminated nonwoven fabric of the present disclosure, each of the plurality of projections and the plurality of recesses can be point-like in the planar direction as shown in the fourth embodiment. By doing so, the laminated nonwoven fabric tends to be excellent in air permeability particularly in the planar direction.
The plurality of convex portions, which are point-like, can be arranged, for example, in a zigzag manner in the planar direction. Also, the plurality of recesses can be arranged, for example, in a staggered manner in the planar direction.

The pitch of the plurality of projections, which are point-like, is preferably 1.0 to 10.0 mm, and more preferably 1.5 to 7.0 mm. It is from the viewpoint of liquid permeability and cushioning feeling.
The height of each of the plurality of projections, which are point-like, is preferably 0.3 to 10.0 mm, and more preferably 0.5 to 5.0 mm. It is from the viewpoint of liquid permeability and cushioning feeling.

The height of the plurality of convex portions and the plurality of concave portions immerse the laminated nonwoven fabric in liquid nitrogen, and then the laminated nonwoven fabric after immersion is divided into two pieces, and the cross section is observed with a microscope such as an electron microscope or an optical microscope It is measured by measuring its height.
The height of the convex portion is the distance in the thickness direction between the top of the laminated nonwoven fabric, which is the highest point of the convex portion, and the lower surface of the convex portion (the first lower surface of the first nonwoven fabric portion) means. Moreover, the height of a recessed part means the distance of the thickness direction between the vertex which is the highest point of a recessed part among the upper surfaces of a laminated nonwoven fabric, and the lower surface of a recessed part.

In the laminated nonwoven fabric of the present disclosure, the apex of the upper surface of the convex portion (that is, the second upper surface of the second nonwoven fabric portion) is the center of the convex portion in the planar direction of the laminated nonwoven fabric (if the convex portion is a ridge portion) It is preferable to arrange | position in the center of the width direction of a collar part.
In the laminated nonwoven fabric of the present disclosure, the second lower surface of the second nonwoven fabric portion preferably has a shape corresponding to the first upper surface of the first nonwoven fabric portion. This is from the viewpoint of reducing the void portion even if the convex portion does not have a void portion or when the convex portion has a void portion.

Each of the plurality of protrusions of the laminated nonwoven fabric of the present disclosure has a proportion of planar orientation fibers at the top of more than 50%, more preferably more than 60%, and even more preferably more than 70%. By doing so, the top of the convex portion is excellent in smoothness.
In addition, each of the plurality of projections of the laminated nonwoven fabric of the present disclosure has a ratio of thickness direction oriented fibers in the side wall of more than 50%, more preferably more than 60%, and still more preferably more than 70%. By doing so, the convex portion is excellent in cushioning property due to the fibers oriented in the thickness direction of the side wall portion.
Further, it is particularly preferable to satisfy the above-mentioned ratio of the thickness direction oriented fiber in the side wall portion in a range overlapping with the top portion of the convex portion and the thickness direction of the laminated nonwoven fabric. It is from the viewpoint of the cushioning property of the convex portion.

As used herein, the proportion of planar orientation fibers and the proportion of thickness orientation fibers are measured as follows.
(1) Cut the laminated nonwoven fabric to prepare a sample.
(2) Using a digital microscope VHX-100 manufactured by Keyence Corporation, an enlarged image from the direction perpendicular to the cut surface of the sample is taken. The magnified image is an image magnified to a magnification that allows measurement of 50 or more fibers, and the magnification is, for example, 20 to 50 times. At the time of shooting an enlarged image, focus on the fiber on the front side of the cut surface of the non-sample (except for the fiber that has jumped out to the front), and set the shooting depth (depth). The enlarged image is created on the PC screen as a 3D image.

(3) Convert a 3D image into a 2D image, draw a plurality of lines extending parallel to the thickness direction of the sample on the 2D image, and exceed -45 degrees and less than +45 degrees with respect to the thickness direction of the sample Count the number of fibers (thickness direction fibers) oriented at an angle of.
(4) Similarly, on the 2D image, draw a plurality of lines extending parallel to the plane direction of the sample, and orient them at an angle of more than -45 degrees and less than +45 degrees with respect to the plane direction of the sample Count the number of directionally oriented fibers).
(5) From the number of thickness direction oriented fibers and the number of plane direction oriented fibers, their ratio is calculated.
(6) Repeat (1) to (5) a total of 10 times at different places of the convex portion, and adopt the average value.

  In each of the plurality of convex portions of the laminated nonwoven fabric of the present disclosure, the fiber density of the first nonwoven fabric portion is preferably higher than the fiber density of the second nonwoven fabric portion. By doing so, when the laminated nonwoven fabric is pressed, the laminated nonwoven fabric is excellent in cushioning properties. Further, the laminated nonwoven fabric can draw the liquid that has reached the upper surface (the second upper surface of the second nonwoven fabric portion) from the second nonwoven fabric portion of the convex portion to the first nonwoven fabric portion using the fiber density difference. So, it is excellent in liquid absorption.

As used herein, fiber density means the mass of fiber per unit volume.
The fiber density is high or low by immersing the laminated nonwoven fabric in liquid nitrogen, then dividing the immersed laminated nonwoven fabric into two pieces, photographing a plurality of cross sections with a microscope, for example, an electron microscope or an optical microscope, and visually to decide.

In the present specification, the above-mentioned maximum distance immerses the laminated nonwoven fabric in liquid nitrogen, and then divides the immersed laminated nonwoven fabric into two pieces so as to pass through the apex of the convex part, and the cross section thereof is a microscope, for example, electron It observes with a microscope or an optical microscope, and judges by measuring the length of the thickness direction of a void.
The maximum distance is indicated as D _{max in} FIG. As shown in FIG. 8, in general, the maximum distance D _max is at a position overlapping the apex 53 of the convex portion 25 in the thickness direction T.

In the laminated nonwoven fabric of the present disclosure, for example, when the laminated nonwoven fabric includes an adhesive layer, the boundary between the first nonwoven fabric portion and the second nonwoven fabric portion in each of the plurality of convex portions is, for example, an adhesive layer. It can be determined by coloring.
In addition, when the laminated non-woven fabric does not include an additional layer between the first non-woven fabric portion and the second non-woven fabric portion, the boundary between the first non-woven fabric portion and the second non-woven fabric portion is the first non-woven fabric portion And it can be comprehensively judged from the kind of fiber which constitutes the second nonwoven fabric portion, the fineness, the orientation and the like.

The laminated nonwoven fabric of the present disclosure can include an adhesive layer between the first nonwoven fabric and the second nonwoven fabric. As an adhesive agent which comprises the said contact bonding layer, what is known in this technical field as a hot-melt-adhesive agent etc. are mentioned.
The adhesive layer may be coated in the entire plane direction between the first nonwoven fabric and the second nonwoven fabric, but the laminated nonwoven fabric of the present disclosure is used for the liquid-permeable sheet of the absorbent article. In consideration of the above, it is preferable that the adhesive be applied intermittently.

  In the case where the laminated nonwoven fabric of the present disclosure includes the adhesive layer between the first nonwoven fabric and the second nonwoven fabric, the adhesive layer is in a range overlapping the apex of the convex portion in the planar direction with the thickness direction. It is preferable to arrange | position, It is more preferable to be arrange | positioned in the range which overlaps with the top part of convex part in thickness direction, and it is further more preferable to arrange | position to the whole convex part. It is from a viewpoint of making a convex part solid, more preferably, a convex part not having a void.

Where the laminated nonwoven fabric of the present disclosure comprises the adhesive layer, the laminate nonwoven fabric preferably comprises the adhesive layer at a basis weight of preferably ^{2 to} 10 g / m ² , and more preferably 4 to 7 g / m ^2. it can. It is from a viewpoint of joining a 1st nonwoven fabric part and a 2nd nonwoven fabric part, without inhibiting the permeability of a fluid.

In the laminated nonwoven fabric of the present disclosure, the first nonwoven fabric portion of at least a portion of the plurality of projections includes the first top and the first side wall portion, and the first nonwoven fabric portion is more than 50%, more preferably 55%. It has a proportion of plane-oriented fibers at the top of the first, more preferably more than 60%. Furthermore, in the laminated nonwoven fabric of the present disclosure, the thickness at the first sidewall of at least a portion of the first nonwoven fabric portion of at least a portion of the plurality of projections is more than 50%, more preferably more than 55%, and still more preferably more than 60%. It has a ratio of longitudinally oriented fibers. By doing so, the 1st nonwoven fabric part acts as a base of a convex part, and a convex part and by extension, a lamination nonwoven fabric are excellent in cushioning properties.
In addition, the ratio of the planar direction orientation fiber and the ratio of the thickness direction orientation fiber are measured as described above.

  In the laminated nonwoven fabric of the present disclosure, the first upper surface of the first non-woven fabric portion protrudes upward in each of the plurality of convex portions, and preferably, the first top portion of the first non-woven fabric portion is laminated with the top of the convex portion Overlapping in the thickness direction of the non-woven fabric, more preferably, the first top of the first non-woven fabric portion corresponds to the top of the convex portion and the thickness direction of the laminated non-woven fabric, and more preferably, the first The first apex of the non-woven fabric portion coincides with the apex of the convex portion and the thickness direction of the laminated non-woven fabric. It is from the viewpoint of the effect of this indication.

  In the laminated nonwoven fabric of the present disclosure, when the first nonwoven fabric portion of at least a portion of the plurality of projections includes the first top and the first side wall, the first top of the first nonwoven fabric portion, and the projections It is preferable that the tops of the upper and lower portions overlap in the thickness direction, and more preferably substantially coincide with each other. It is from the viewpoint of the effect of this indication.

Moreover, it is preferable that the 1st side wall part of a 1st nonwoven fabric part and the side wall part of a convex part overlap in the thickness direction, and it is more preferable that it substantially corresponds. It is from the viewpoint of the effect of this indication.
Furthermore, it is preferable that the first vertex of the first non-woven fabric portion and the vertex of the convex portion substantially coincide with each other in the thickness direction. It is from the viewpoint of the effect of this indication.

In the laminated non-woven fabric of the present disclosure, the height of the first vertex of the first non-woven fabric portion is preferably 5 to 90%, and more preferably 10 to 80% of the height of the projection to which the first non-woven fabric portion belongs. It has a height. By doing so, the convex portion tends to be excellent in cushioning property and liquid absorption property.
In addition, the height of the 1st vertex of a 1st nonwoven fabric part means the distance of the thickness direction between a 1st vertex and a 1st lower surface.

In each of the plurality of convex portions of the laminated nonwoven fabric of the present disclosure, the height of the first vertex of the first nonwoven fabric portion is higher than the height of the first lowest point, which is the lowest point of the first upper surface of the first nonwoven fabric portion. Preferably 1.5 to 100 times higher and more preferably 2 to 80 times higher. By doing so, the convex portion tends to be excellent in cushioning property and liquid absorption property.
In addition, the height of the said 1st lowest point means the distance of the thickness direction between a 1st lowest point and the 1st lower surface of a 1st nonwoven fabric part.

In the laminated nonwoven fabric of the present disclosure, it is preferable that the first lower surface of the first nonwoven fabric portion includes a flat region in at least a part of the plurality of projections, preferably in all the plurality of projections. By doing so, when the laminated nonwoven fabric of this indication is used as a liquid-permeable sheet of an absorptive article, it is excellent in the delivery nature of the fluid to an absorber.
In the present specification, a flat region means a region in which the height difference in the thickness direction between the highest portion and the lowest portion in a plane is 5% or less of the height of the projection. .
The height difference is measured using a two-dimensional laser displacement meter. As said two-dimensional laser displacement meter, Keyence Corporation high precision two-dimensional laser displacement meter LJ-G series (model: LJ-G030) is mentioned, for example.

  In the laminated nonwoven fabric of the present disclosure, at least a portion of the plurality of convex portions, at least a portion of the plurality of convex portions, preferably all of the plurality of convex portions, the first lower surface of the first nonwoven fabric portion is at least a convex portion It is preferable that a flat area is included in the top of the and the overlapping area in the thickness direction of the laminated nonwoven fabric. When the laminated nonwoven fabric of the present disclosure is used as a liquid permeable sheet of an absorbent article, it is from the viewpoint of transferability of the liquid to the absorber.

  It does not restrict | limit especially as said absorbent article in which the laminated nonwoven fabric of this indication is used, For example, a sanitary napkin, a panty liner, a disposable diaper, a urine absorption pad, etc. are mentioned.

DESCRIPTION OF SYMBOLS 1 laminated nonwoven fabric 3 upper surface 5 lower surface 7 1st nonwoven fabric 8 1st nonwoven fabric part 9 1st upper surface 11 1st lower surface 13 1st top part 15 1st side wall part 17 2nd nonwoven fabric 18 2nd nonwoven fabric part 19 2nd upper surface 21 2nd lower surface 23 adhesive layer 25 convex portion 27 top portion 29 side wall portion 31 concave portion 41 embossed portion 43 non-embossed portion 51 void portion 53 apex portion 55 lowest point 57 intermediate surface 59 first apex 61 first intermediate surface 63 first lowest point

Claims (12)

A laminated nonwoven fabric for a liquid-permeable sheet of an absorbent article, having a thickness direction including upper and lower portions, and a planar direction, comprising a first nonwoven fabric and a second nonwoven fabric disposed above the first nonwoven fabric. And
The laminated nonwoven fabric is a plurality of convex portions projecting upward, each having a top and a side wall portion, and a plurality of concave portions, each of which is an embossed portion of the first nonwoven fabric and the second nonwoven fabric And one with
Each of the plurality of projections is composed of a first non-woven fabric, and is composed of a first non-woven fabric portion comprising a first upper surface and a first lower surface, and a second non-woven fabric, comprising a second upper surface and a second lower surface; And a second non-woven fabric portion forming the side wall portion,
The first upper surface of the first non-woven fabric portion projects upward, and each of the plurality of projections has a ratio of more than 50% of the fibers oriented in the planar direction at the top and more than 50%. A ratio of fibers oriented in the thickness direction in the side wall portion,
The laminated nonwoven fabric characterized in that.   The laminated non-woven fabric according to claim 1, wherein in the second non-woven fabric portion of each of the plurality of convex portions, the fineness of the fibers of the second upper surface is lower than the fineness of the fibers of the second lower surface.   The laminated nonwoven fabric according to claim 1 or 2, wherein the fiber density of the first nonwoven fabric portion is higher than the fiber density of the second nonwoven fabric portion in each of the plurality of convex portions.   The laminated nonwoven fabric according to any one of claims 1 to 3, wherein at least a part of the plurality of convex portions is solid.   The laminated nonwoven fabric according to any one of claims 1 to 4, further comprising an adhesive layer between the first nonwoven fabric portion and the second nonwoven fabric portion in at least a part of the plurality of convex portions. Laminated non-woven fabric.   The laminated nonwoven fabric according to any one of claims 1 to 5, wherein the first nonwoven fabric is an air through nonwoven fabric.   The laminated non-woven fabric according to any one of claims 1 to 6, wherein the second non-woven fabric is an air through non-woven fabric arranged such that the second upper surface of the second non-woven fabric portion is a net surface.   A first non-woven fabric portion of at least a portion of the plurality of projections comprising a first apex and a first side wall, wherein the ratio of fibers oriented in the planar direction at the first apex is greater than 50%; The laminated nonwoven fabric according to any one of claims 1 to 7, having a percentage of fibers oriented in the thickness direction in the first side wall portion by more than%.   The laminated nonwoven fabric according to any one of claims 1 to 8, wherein each of the plurality of projections is a ridge extending in a predetermined direction.   Each of the plurality of recesses is a groove extending along the predetermined direction between two adjacent ridges, and the groove is intermittently arranged along the predetermined direction. The laminated nonwoven fabric according to claim 9, comprising a part.   The laminated non-woven fabric according to any one of claims 1 to 10, wherein the first lower surface of the first non-woven fabric portion includes a flat region in at least a part of the plurality of convex portions.   Use of the laminated nonwoven fabric according to any one of claims 1 to 11 for a liquid-permeable sheet of an absorbent article.

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