KR20190032397A - A laminated nonwoven fabric for a liquid-permeable sheet of an absorbent article and a laminated nonwoven fabric for use of the laminated nonwoven fabric as a liquid-permeable sheet of an absorbent article - Google Patents

Abstract

The present disclosure aims to provide a laminated nonwoven fabric for a liquid-permeable sheet of an absorbent article which is excellent in absorbent properties and softness. The laminated nonwoven fabric of the present disclosure has the following constitution.
A first non-woven fabric 7 and is a laminated nonwoven fabric (1) for the liquid permeable sheet 103, a laminated nonwoven fabric (1), the upper (T _U), the absorbent article 101 and a second nonwoven fabric (17) Each having a top portion 27 and a side wall portion 29 and a plurality of recesses 31 each of which is provided with an embossed portion 41 Each of the plurality of convex portions 25 includes a first nonwoven fabric portion 8 composed of a first nonwoven fabric 7 and a second nonwoven fabric portion 18 composed of a second nonwoven fabric 17 includes and a first a first upper surface 9 of the non-woven part (8), the upper (T _U) protrude and, and and each of the plurality of convex portions (25), of greater than 50%, the top portion 27 to the , And a ratio of the oriented fibers in the thickness direction in the side wall portion (29) of more than 50%.

Description

A laminated nonwoven fabric for a liquid-permeable sheet of an absorbent article and a laminated nonwoven fabric for use of the laminated nonwoven fabric as a liquid-permeable sheet of an absorbent article

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

As a nonwoven fabric for a liquid-pervious sheet for an absorbent article, there is known a nonwoven fabric having a plurality of concave portions and convex portions excellent in breathability and the like. A nonwoven fabric produced by various methods, for example, To form a concave-convex shape on the first sheet, to join the first sheet having the convex-concave shape to the second sheet, and to the nonwoven fabric produced by the method.

For example, Patent Document 1 discloses a method for producing a composite sheet in which a first sheet and a second sheet are partially joined to form a plurality of joined portions and a convex portion is formed on a portion other than the joined portion in the first sheet Wherein a volumetric recovery sheet whose volume is restored by heat treatment is used on at least one of the both sheets and the first and second rolls having tooth spaces that mesh with each other on the main surface portion are rotated The first sheet is fed to the engaging portions thereof and the first sheet is held as it is along the main surface portion of the first roll so as to move from the engaging portion and then the second sheet is fed so as to overlap the first sheet, When the sheet is partly joined to form a composite, the anti-net surface at the time of manufacturing the above-described volumetric recovery sheet is used as a surface facing the overlapped sheet, Before or after the bonding and a method of manufacture is described composite sheet was heat-treated to the volume of resilient sheet.

Japanese Unexamined Patent Application Publication No. 2008-155602

[0047] As described in the paragraph [0047] and the like, the method for producing a composite sheet described in Patent Document 1 is a method for improving the hygroscopicity and the like by filling voids of the convex portion formed by the conventional production method with fluff- The composite sheet of Patent Document 1, however, has a void portion in the convex portion as shown in Fig. 1 (b). If the convex portion has a void portion, the permeation of the liquid tends to be inhibited. Therefore, the composite sheet of Patent Document 1 has room for improvement from the viewpoint of liquid-absorbing properties.

Accordingly, the present disclosure aims to provide a laminated nonwoven fabric for a liquid-pervious sheet of an absorbent article which is excellent in absorbent properties and softness.

The present disclosure relates to a laminated nonwoven fabric for a liquid-pervious sheet for an absorbent article, comprising a first nonwoven fabric and a second nonwoven fabric disposed above the first nonwoven fabric, the first nonwoven fabric having a thickness direction including an upper and a lower direction, Wherein the laminated nonwoven fabric has a plurality of convex portions projecting upwardly, each of the convex portions having a top portion and a side wall portion and a plurality of concave portions each having an embossed portion of the first nonwoven fabric and the second nonwoven fabric Wherein each of the plurality of convex portions is constituted by a first nonwoven fabric and comprises a first nonwoven portion having a first upper surface and a first lower surface and a second nonwoven fabric, and the second upper surface and the second lower surface And a second nonwoven portion constituting said top portion and said side wall portion, wherein a first upper surface of said first nonwoven portion protrudes upwardly, and each of said plurality of convex portions comprises: And a ratio of fibers oriented in the planar direction in the top portion of 50% or more and a ratio of fibers oriented in the thickness direction in the side wall portion of more than 50% Respectively.

The laminated nonwoven fabric for liquid-pervious sheets of the absorbent article of the present disclosure is excellent in liquid-absorbency and softness.

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

 [Justice]

· "Upward" and "Downward"

In the present specification, "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, respectively, in the thickness direction of the laminated nonwoven fabric of the present disclosure. The upper and lower surfaces of the laminated nonwoven fabric are surfaces constituted by the second nonwoven fabric and the first nonwoven fabric, respectively, and the upper surface and the lower surface of the laminated nonwoven fabric are respectively the second upper surface of the second nonwoven portion and the second upper surface of the first non- As shown in FIG.

&Quot; convex portion " and " concave portion "

In the present specification, the "convex portion" and the "concave portion" are defined by a plane parallel to the thickness direction of the laminated nonwoven fabric. The concave portion is composed of an embossed portion. When the concave portion extends in a predetermined direction (for example, in the case of the groove portion), the embossed portion can be arranged continuously or intermittently in a predetermined direction, and the embossed portion between the embossed portions of the intermittently arranged embossed portion The region is also included in the concave portion. The convex portion protrudes upward and has a top portion and a side wall portion.

&Quot; top " and " sidewall "

In this specification, each of the "top" and "sidewall" of the convex portion is formed as a second nonwoven portion. Quot; top " and " sidewall portions " of the convex portion are defined by intermediate planes which are in the middle of the vertex, which is the highest point and the lowest point, which are the highest point and are parallel to the plane direction, among the second nonwoven portion of the convex portion. The top portion of the convex portion refers to a portion included in the height between the apex and the middle surface of the second nonwoven fabric portion and the side wall portion of the convex portion has a portion lower than the intermediate surface and higher than the lowest portion of the second non- it means.

2, the intermediate surface 57 is positioned at the middle of the difference in height D _P between the apex 53 of the convex portion 25 and the lowest point 55 of the concave portion, and the convex portion 25 The top part 27 of the convex part 25 means the area between the apex 53 and the intermediate surface 57 of the second nonwoven fabric part 18 and the side wall part 29 of the convex part 25 corresponds to the area between the second Means an area of the nonwoven fabric part 18 that is lower than the intermediate surface 57 and higher than the lowest point 55. [

The " first top portion " and the " first sidewall portion "

In the present specification, the "first peak" and the "first sidewall" of the first nonwoven fabric portion are defined by a difference in height between the first upper surface of the first nonwoven fabric portion, that is, a first peak, which is the highest point on the first upper surface, Which is the lowest point of the upper surface, and which is parallel to the plane direction. The first top portion of the first nonwoven portion means a region included in the height between the first vertex and the second intermediate surface of the first nonwoven portion and the first side wall portion of the first non- Refers to a region of the nonwoven fabric portion that is lower than the first intermediate surface and higher than the lowest point.

2, the first intermediate surface 61 has a height difference between the first vertex 59 of the first top surface 9 and the first lowest point 63 of the first top surface 9 D _F of the first nonwoven fabric portion 8 and the first top portion 13 of the first nonwoven portion 8 is located in the middle of the first nonwoven fabric portion 8 between the first apex 59 and the first intermediate surface 61 And the first side wall portion 15 of the first nonwoven fabric portion 8 means a region of the first nonwoven fabric portion 8 which is lower than the first intermediate face 61 and higher than the lowest point 141 do.

· "Solidity" about convex part

In this specification, when 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 5% or less of the height of the convex portion, the convex portion is defined as " solid ". The solid convex portion preferably has a height of the convex portion, preferably not more than 3%, and more preferably not more than 1% of the height of the convex portion, and a second top surface of the first non-woven portion of the convex portion, Lt; / RTI >

&Quot; Air gap portion "

Quot; void portion " means a space formed 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. (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, that is, 0% of the height of the convex portion) (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 not less than 0% and not more than 5% of the height of the convex portion) having air gap portions . From the viewpoint of the liquid-absorbing property, it is preferable that the convex portion has no void portion.

The present disclosure relates to the following aspects.

[Mode 1]

A laminated nonwoven fabric for a liquid-pervious sheet for an absorbent article, comprising a first nonwoven fabric and a second nonwoven fabric disposed above the first nonwoven fabric, the first nonwoven fabric having a thickness direction including an upper direction and a lower direction,

Wherein the laminated nonwoven fabric has a plurality of protrusions projecting upwardly, each of the protrusions having a top portion and a side wall portion, and each of the plurality of recesses includes an embossed portion of the first nonwoven fabric and the second nonwoven fabric and,

Wherein each of the plurality of convex portions comprises a first nonwoven fabric portion composed of a first nonwoven fabric and having a first upper surface and a first lower surface and a second upper surface and a second lower surface, And a second nonwoven portion constituting a top portion and a side wall portion,

The first upper surface of the first nonwoven portion protrudes upward, and

Wherein each of the plurality of convex portions has a ratio of fibers oriented in the plane direction in the top portion of more than 50% and a proportion of fibers oriented in the thickness direction in the side wall portion of more than 50% Wherein the laminated nonwoven fabric is a laminated nonwoven fabric.

In the laminated nonwoven fabric, each of the plurality of convex portions includes a first nonwoven portion having a predetermined shape and a second nonwoven portion having a predetermined shape, so that the laminated nonwoven fabric has the upper surface (the second surface of the second nonwoven portion (Hereinafter sometimes referred to as " when the laminated nonwoven fabric is press-fitted "), the laminated nonwoven fabric is peeled off from the laminated nonwoven fabric due to the shape of the first nonwoven fabric portion and the second nonwoven fabric portion, Excellent cushioning. When the convex portion is solid, the liquid reaching the upper surface (second upper surface of the second nonwoven portion) of the laminated nonwoven fabric can be quickly transferred from the second nonwoven portion to the first nonwoven portion, (I.e., the convex portion has a void portion), when the laminated nonwoven fabric is press-fitted, the first upper surface of the first nonwoven portion protruding upward comes into contact with the second lower surface of the second nonwoven portion, The liquid that has easily disappeared and reaches the upper surface of the laminated nonwoven fabric can be quickly transferred from the second nonwoven portion to the first nonwoven portion so that the laminated nonwoven fabric has excellent liquid absorbency.

In the second nonwoven fabric portion of each of the convex portions of the laminated nonwoven fabric, the top portion and the side wall portion each have a fiber orientation in the plane direction of more than 50% (hereinafter, (Hereinafter sometimes referred to as " fibers oriented in the thickness direction ") in the thickness direction of the side wall portion, and the ratio of the fibers oriented in the thickness direction in the side wall portion Thickness direction oriented fibers "), the top portion of the convex portion is excellent in smoothness due to the planar direction oriented fibers, and the convex portion is cushioning due to the thickness direction oriented fibers of the side wall portion great.

From the above, the laminated nonwoven fabric is excellent in liquid-absorbing property, softness due to cushioning and smoothness.

[Mode 2]

The laminated nonwoven fabric according to Claim 1, wherein the fineness of the fibers on the second upper surface is lower than the fineness of the fibers on the second lower surface in each second non-woven fabric portion of the plurality of convex portions.

In the second nonwoven fabric portion of each of the convex portions of the laminated nonwoven fabric, the fineness of the fibers on the second upper surface is lower than the fineness of the fibers on the second lower surface. Therefore, the difference in fineness of the second upper surface and the fineness of the second lower surface As a result, the top portion of the convex portion is excellent in smoothness, and the convex portion is excellent in cushioning feeling.

[Mode 3]

The laminated nonwoven fabric according to either of the first or second aspects, wherein in each of the plurality of convex portions, the fiber density of the first non-woven portion is higher than that of the second non-woven portion.

In the laminated nonwoven fabric, each of the plurality of convex portions includes a first nonwoven portion having a high fiber density and a second nonwoven portion having a low fiber density, so that the laminated nonwoven fabric has excellent cushioning property when the laminated nonwoven fabric is press-fitted. Further, the laminated nonwoven fabric has excellent liquid absorbency because the liquid that has reached the upper surface thereof can be drawn into the first nonwoven fabric portion from the second nonwoven fabric portion of the convex portion using a fiber density difference.

[Mode 4]

The laminated nonwoven fabric according to any one of claims 1 to 3, wherein at least a part of the convex portions is solid.

In the laminated nonwoven fabric, since at least a part of the plurality of projections is solid, when there is no gap between the first upper surface of the first nonwoven portion and the second lower surface of the second nonwoven portion, that is, the convex portion has no void portion , The laminated nonwoven fabric can quickly transfer the liquid reaching the upper surface thereof from the second nonwoven portion to the first nonwoven portion. When there is an air gap between the first upper surface of the first nonwoven portion and the second lower surface of the second nonwoven portion, that is, when the convex portion has a void portion, when the laminated nonwoven fabric is press-fitted, Since the first upper surface and the second lower surface of the second nonwoven fabric portion are in contact with each other and the void portion can be easily lost, the laminated nonwoven fabric can be prevented from reaching the upper surface of the laminated nonwoven fabric from the second nonwoven fabric portion to the first nonwoven fabric portion So that the laminated nonwoven fabric is excellent in the liquid-absorbing property of the liquid.

[Mode 5]

The laminated nonwoven fabric according to any one of claims 1 to 4, wherein the laminated nonwoven fabric further comprises an adhesive layer between the first nonwoven portion and the second nonwoven portion in at least a part of the plurality of convex portions.

Since the laminated nonwoven fabric further includes an adhesive layer between the first nonwoven fabric part and the second nonwoven fabric part at least a part of the plurality of convex parts, even when the convex part has a void part, when the laminated nonwoven fabric is press- The gap can easily be lost. Further, when the laminated nonwoven fabric is used as a liquid-pervious sheet of an absorbent article, even when twisting or the like is applied, voids are unlikely to be formed in the convex portions. As a result, the laminated nonwoven fabric can be excellent in absorbent properties and softness over a long period of time.

[Mode 6]

The laminated nonwoven fabric according to any one of claims 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 the liquid-permeable sheet of the absorbent article, the shape of the first nonwoven fabric portion, particularly, It is liable to be seen in both of them. As a result, the laminated nonwoven fabric can have excellent liquid-absorbing properties and softness.

[Mode 7]

The laminated nonwoven fabric according to any one of claims 1 to 6, wherein the second nonwoven fabric is an air-through nonwoven fabric arranged so that the second upper surface of the second nonwoven portion becomes the net surface.

In the laminated nonwoven fabric, since the second nonwoven fabric is the air-through nonwoven fabric arranged so that the second upper surface of the second nonwoven portion becomes the net surface, the upper surface of the convex portion (the second upper surface of the second nonwoven fabric), and the laminated nonwoven fabric, great.

[Mode 8]

Wherein at least a portion of the first nonwoven fabric portion of the plurality of convex portions has a first top portion and a first sidewall portion, wherein the ratio of the fibers oriented in the plane direction in the first top portion of more than 50% Wherein the ratio of the fibers oriented in the thickness direction in the first sidewall portion of the laminated nonwoven fabric is in the range of 1:

In the first nonwoven fabric portion of at least a part of the convex portions of the laminated nonwoven fabric, the first top portion and the first sidewall portion each include a specific amount of the planar orientation fibers and the thickness direction fibers so that the convex portion, The nonwoven fabric has excellent cushioning properties.

[Mode 9]

The laminated nonwoven fabric according to any one of claims 1 to 8, wherein each of the plurality of convex portions is a rim portion extending in a predetermined direction.

In the laminated nonwoven fabric, each laminated nonwoven fabric is excellent in smoothness in a predetermined direction because each of the plurality of convex portions is a ridge portion extending in a predetermined direction.

[Mode 10]

Wherein each of the plurality of recesses is a groove portion extending along the predetermined direction between adjacent two of the recesses and the recess portion includes the emboss portion intermittently arranged along the predetermined direction, The laminated nonwoven fabric according to embodiment 9.

In the laminated nonwoven fabric, each of the plurality of recesses is a groove portion, and the groove portion includes intermittently arranged embossed portions, so that the laminated nonwoven fabric has excellent softness.

[Mode 11]

The laminated nonwoven fabric according to any one of claims 1 to 10, wherein, in at least a part of the plurality of projections, the first lower surface of the first nonwoven portion includes a flat region.

In the laminated nonwoven fabric, since the first lower surface of the first nonwoven 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 portion has a non- Permeable sheet is excellent in the transferability of the liquid from the liquid-pervious sheet to the absorber.

[Mode 12]

Use of the laminated nonwoven fabric according to any one of claims 1 to 11 as a liquid-permeable sheet of an absorbent article.

This use has the above-described effects.

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

≪ First Embodiment >

1 is a perspective view of a laminated nonwoven 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 taken along a section II-II in Fig. 3 and 4 are a front view and a rear view of the laminated nonwoven fabric 1, respectively.

The laminated nonwoven fabric 1 according to the first embodiment has a thickness direction T including an upper direction T _U and a lower direction T _L and a first direction D ₁ and a first direction D ₁ , And a planar direction P including a second direction D ₂ orthogonal to each other. The laminated nonwoven fabric 1 has an upper face 3 forming a skin contact face when used as a liquid permeable sheet of the absorbent article and a lower face 5 facing the absorbent body when used as a liquid permeable sheet of the absorbent article. Respectively. The upper face 3 and the lower face 5 of the laminated nonwoven fabric 1 each have a second upper face 19 of the second nonwoven portion 18 and a first lower face 11 of the first nonwoven portion 8, .

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) has a first upper surface (9) and a first lower surface (11). The second nonwoven fabric (17) has a second upper surface (19) and a second lower surface (21).

The first lower surface 11 of the first nonwoven fabric may be a part of the lower surface 5 of the laminated nonwoven fabric 1 and the second upper surface of the second nonwoven fabric may constitute a part of the upper surface 3 of the laminated non- .

The laminated nonwoven fabric (1) is provided with a plurality of projections 25 which project upward _(U T), having a plurality of recesses 31. Concretely, each of the plurality of recesses 31 has an embossed portion 41 formed by successively embossing the first nonwoven fabric 7 and the second nonwoven fabric 17 along the first direction D ₁ ).

Each of the plurality of convex portions 25 is a ridge portion extending in the first direction D ₁ and each of the plurality of concave portions 31 is a groove portion extending in the first direction D ₁ . , And the convex portion 25 (i.e., the rim portion) and the concave portion 31 (i.e., the groove portion) are alternately arranged in the second direction D ₂ .

Each of the plurality of convex portions 25 has a top portion 27 including a vertex 53 and a side wall portion 29.

Each of the plurality of convex portions 25 has a first nonwoven fabric (7), a first upper surface 9 is the upper (T _U), the first non-woven fabric portion 8 and the second nonwoven fabric 17 projecting consisting of And a second nonwoven portion 18, The first nonwoven portion comprises a first top portion 13 and a first side wall portion 15 and the second nonwoven portion constitutes a top portion 27 and a side wall portion 29 of the convex portion 25 have. 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 convex portions 25 has a ratio of the planar direction oriented fibers in the top portion 27 of more than 50% and a ratio of the oriented fibers in the thickness direction in the side wall portion 29 of more than 50% . By doing so, the top portion 27 of the convex portion 25 is excellent in smoothness owing to the planar direction oriented fibers and the convex portion 25 is excellent in cushioning property due to the oriented fibers in the thickness direction of the side wall portion 29 Is excellent.

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 in each second nonwoven portion 18 of the plurality of projections 25. The top portion 27 of the convex portion 25 is excellent in smoothness and the convex portion 25 is excellent in smoothness due to the difference between the fineness of the second upper surface 19 and the fineness of the second lower surface 21. [ Excellent sense.

In each of the plurality of convex portions 25, the fiber density of the first non-woven portion 8 is higher than that of the second non-woven portion 18. By doing so, when the laminated nonwoven fabric 1 is subjected to a force for pushing in the thickness direction T from the upper surface 3, the laminated nonwoven fabric 1 is excellent in cushioning property. The laminated nonwoven fabric 1 can be obtained by drawing the liquid reaching the upper face 3 from the second nonwoven portion 18 of the convex portion 25 into the first nonwoven portion 8 by using a fiber density difference The laminated nonwoven fabric 1 is excellent in the liquid-absorbing property of the liquid.

In each of the plurality of convex portions 25, the first lower surface 11 of the first nonwoven portion 8 includes a flat region. The laminated nonwoven fabric 1 has a flat bottom surface 5 except a plurality of recessed portions 31 and a portion adjacent to them. By doing so, when the laminated nonwoven fabric 1 is used as the liquid-permeable sheet of the absorbent article, the first lower surface 11 of the first nonwoven portion 8 is used to constitute the non-skin contact surface, Absorbing property of the liquid to the absorber is excellent, and further, the absorbent article is excellent in the liquid-absorbing property.

In each of the plurality of convex portions 25, the adhesive layer 23 is formed so that the first top surface 9 of the first nonwoven fabric portion 8 and the second bottom surface 21 of the second nonwoven portion 18 ). Specifically, the adhesive layer 23 is intermittently disposed between the first non-woven portion 8 and the second non-woven portion 18 over the entire plane direction P of the convex portion 25 . Although not shown in the drawing, the adhesive layer 23 is provided between the first nonwoven fabric 7 and the second nonwoven fabric 17 in each of the plurality of recesses 31 in the plane direction of the recess 31 Are arranged intermittently over the entire surface of the substrate P as shown in Fig.

The first nonwoven fabric portion 8 has a ratio of the planar orientation fibers in the first top portion 13 of more than 50% and a ratio of the thickness direction oriented fibers in the first side wall portion 15. By doing so, the convex portion 25 is excellent in cushioning property.

Figs. 5 and 6 are views for explaining the use of the laminated nonwoven fabric 1 according to the first embodiment in the liquid-permeable sheet 103 of the absorbent article 101. Fig. Specifically, Fig. 5 is a plan view of an absorbent article 101 having the laminated nonwoven fabric 1 according to the first embodiment as a liquid-permeable sheet 103. Fig. 6 is a partial cross-sectional view of the absorbent article 101 taken along the section VI-VI of FIG.

As shown in Figs. 5 and 6, the absorbent article 101 includes a plurality of absorbent articles 101 including a longitudinal direction L, a width direction W, an upper side T _U , and a lower side T _L , The liquid-permeable sheet 103, the absorbent body 105 and the liquid-impervious sheet 111 are provided in that order in the thickness direction T and in the thickness direction T, respectively. The absorbent body 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 portion 123 for sealing the end portion of the absorbent article 101, and a liquid permeable sheet 103 and an absorbent 105, The embossed portion 125 formed by bossing, and the fixing portion 127 for fixing the absorbent article 101 to the garment, all of which are well known in the technical field, and a detailed description thereof will be omitted.

5 and 6, the laminated nonwoven fabric 1 as the liquid-permeable sheet 103 is formed so that the upper surface 3 constitutes the skin contact surface of the absorbent article 101, And is disposed so as to be in contact with the absorber 105. The laminated nonwoven fabric 1 is arranged such that the first direction D ₁ and the second direction D ₂ coincide with the longitudinal direction L and the width direction W of the absorbent article 101 have. The thickness direction T including the upper side T _U and the lower side T _L of the laminated nonwoven fabric 1 is the same concept as those of the absorbent article 101.

In the absorbent article 101, the liquid-permeable sheet 103 retains the effect of the laminated nonwoven fabric 1 described above.

In the absorbent article 101, the flat area of the lower surface 5 of the plurality of projections 25 of the liquid-permeable sheet 103 (laminated nonwoven fabric 1) is wider than the absorbent 105, Permeable sheet 103 (laminated nonwoven fabric 1) can be quickly transferred to the absorber 105 because the core wraps 107 are in contact with the core wraps 107.

≪ Second Embodiment >

Fig. 7 is a perspective view showing a laminated nonwoven fabric 1 according to another embodiment of the present disclosure (hereinafter referred to as " second embodiment ").

The laminated nonwoven fabric 1 according to the second embodiment is the same as the laminated nonwoven fabric 1 according to the first embodiment, except for the portions described later, and thus the description thereof is omitted.

The laminated nonwoven fabric 1 according to the second embodiment, and a plurality of projections 25 which project upward _(U T), having a plurality of recesses 31. Each of the plurality of convex portions 25, each of the first direction (D ₁₎ yirang portion is, and a plurality of recesses 31 extending in the are, the groove extending in the first direction (D _1), The convex portion 25 (i.e., the rim portion) and the concave portion 31 (i.e., the groove portion) are alternately arranged in the second direction D ₂ .

The plurality of convex portions 25 are the same as those of the first embodiment. Each of the plurality of concave portions 31 includes a plurality of embossed portions 41 formed by intermittently embossing the first nonwoven fabric 7 and the second nonwoven fabric 17 along the first direction D ₁ ). Each of the plurality of recesses 31 includes a non-embossed portion 43 between the adjacent two embossed portions 41. [ Each of the plurality of recesses 31 includes a plurality of embossed portions 41 and a plurality of non-embossed portions 43, and each of the plurality of embossed portions 41 and the plurality of embossed portions 41, Each of the portions 43 is alternately arranged in the first direction D ₁ .

In the laminated nonwoven fabric 1 according to the second embodiment, in each of the plurality of convex portions 25, the first lower surface 11 of the first nonwoven portion 8 includes a flat region, The lower surface 5 of each of the plurality of embossed portions 43 includes a flat region. In the laminated nonwoven fabric 1 according to the second embodiment, the lower surface 5 is flat except for a plurality of embossed portions 41 and a portion adjacent to them.

The laminated nonwoven fabric 1 has the above-mentioned structure, and in particular, the laminated nonwoven fabric 1 is excellent in softness by including the intermittently arranged embossed portions 41 along the first direction D ₁ .

≪ Third Embodiment >

Fig. 8 is a sectional view corresponding to the section II-II in Fig. 1, illustrating the laminated nonwoven fabric 1 according to another embodiment (hereinafter referred to as " third embodiment ") of the present disclosure.

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 for the portions described later, and thus the description thereof is omitted.

The laminated nonwoven fabric 1 shown in the third embodiment comprises a first nonwoven fabric 7 and a second nonwoven fabric 17 and has an adhesive layer between the first nonwoven fabric 7 and the second nonwoven fabric 17 Do not.

Each of the plurality of convex portions 25 includes a first nonwoven portion 8 having a first upper surface 9 and a first lower surface 11 and a second upper surface 19 and a second lower surface 21, And a second nonwoven fabric portion 18 provided on the second nonwoven fabric portion. In the laminated nonwoven fabric 1, each of the plurality of convex portions 25 is provided between the first upper surface 9 of the first nonwoven portion 8 and the second lower surface 21 of the second nonwoven portion 18 And an air gap portion (51). The void portion 51 is formed in the thicknesswise direction T of the top portion 27 of the second nonwoven fabric portion 18 (convex portion 25) and the first top portion 13 of the first nonwoven fabric portion 8 And are formed in a substantially overlapping range. Each of the plurality of convex portions 25 has the above-mentioned specific void portion 51, so that the cushioning property can be improved while the liquid-absorbing property of the laminated nonwoven fabric 1 is observed.

≪ Fourth Embodiment &

Fig. 9 is a perspective view showing a laminated nonwoven fabric 1 according to another embodiment of the present disclosure (hereinafter referred to as " the fourth embodiment ").

The laminated nonwoven fabric 1 according to the fourth embodiment is the same as the laminated nonwoven fabric 1 according to the first embodiment except for the above-mentioned portions, and a description thereof will be omitted.

The laminated nonwoven fabric 1 according to the fourth embodiment, a plurality of projections 25 which project upward _(U T), having 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 shape of a substantially square pyramid. Also, each of the plurality of convex portions 25 is, in the planar direction (P), intermittently in a first direction (D ₁₎ and second direction (D _2), are arranged in a staggered pattern.

Each of the plurality of concave portions 31 is constituted by an embossed portion 41 formed by embossing the first nonwoven fabric 7 and the second nonwoven fabric 17. In the planar direction P, Are surrounded by four convex portions and are arranged in a zigzag shape in the planar direction (P).

When the laminated nonwoven fabric 1 according to the fourth embodiment is used as a liquid-permeable sheet of an absorbent article, it is possible to reduce the contact area with the user, so that the skin is hardly smashed and the air permeability is high.

≪ Production of laminated nonwoven fabric &

The laminated nonwoven fabric of the present disclosure is not particularly limited and can be produced by various combinations of known methods.

As an example, the laminated nonwoven fabric according to the first embodiment can be manufactured by using the manufacturing apparatus 201 shown in Figs. 10 to 14 and the manufacturing method.

10 is a diagram schematically showing an apparatus 201 for manufacturing a laminated nonwoven fabric 1. 11 schematically shows 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 roll 215. The manufacturing apparatus 201 is configured to carry out the conveyance direction MD and the transverse direction CD orthogonal to the conveyance direction MD along the conveyance surface and conveyance direction MD and a vertical direction TD orthogonal to the transverse direction CD.

In the manufacturing apparatus 201 for producing a laminated nonwoven fabric 1, the laminated nonwoven fabric 1 and the materials (members) constituting the laminated nonwoven fabric 1 are arranged in the first direction D ₁ and the second direction D ₂ And the thickness direction T are equal to the transport direction MD, the transverse direction CD and the up and down direction TD, respectively. Therefore, in the production method of the laminated nonwoven fabric 1, the conveying direction MD, the transverse direction CD and the up and down direction TD are the same as those of the laminated nonwoven fabric 1 and the materials constituting the laminated nonwoven fabric 1 (D ₁ ), the second direction (D ₂ ), and the thickness direction (T) with respect to the first direction (D ₁ ).

Method of manufacturing a laminated nonwoven fabric (1) shown in Figure 10, the first volume restore processing (S _1), and ended step (S ₂₎ and a second volume of the recovery processing (S _3), a coating step (S ₄ ) And a bonding step (S ₅ ).

[First volume recovery step (S ₁ )]

In the first volume recovery step (S ₁ ), a heat treatment for heating the second nonwoven fabric 301 before volume recovery, which is unwound from a second material roll (not shown), to the first heat treatment apparatus 203 Thereby forming a second nonwoven fabric 17. [ Specifically, the first heat treatment apparatus 203 applies heat to the second nonwoven fabric 301 before volume recovery while conveying the second nonwoven fabric 301 before volume recovery in the conveying direction MD, 2 The volume of the nonwoven fabric 301 is recovered to form a second nonwoven fabric 17 having a recovered volume.

In the first heat treatment apparatus 203, the second nonwoven fabric 301 before the volume recovery is conveyed while adjusting the tension by a nip roll or the like provided at both ends of the conveying direction MD of the first heat treatment apparatus 203.

As the method of the heat treatment, for example, it is possible to use any one of the surfaces of the second nonwoven fabric 301 before recovering the volume (for example, in the case where the second nonwoven fabric before volume recovery is an air- The hot air is supplied from the surface of the second nonwoven fabric 301 or the both surfaces thereof so that the hot air passes through the thickness direction of the second nonwoven fabric 301 before recovering the volume.

[Adhesion process (S ₂ )]

Process ended (S ₂₎ in the, and supplies the second nonwoven fabric (17), the engagement region 219 of the first roll 205 and second roll 208.

The first roll 205 is provided with a plurality of first toothed portions 207a continuously extended on the first outer circumferential surface 206 in the conveying direction MD (rotating direction) ) At a predetermined pitch. A region between the adjacent two first teeth portions 207a forms the first recess 207b and the plurality of first teeth 207a and the plurality of first recesses 207b form a crossing Direction (CD).

The second roll 208 is provided with a plurality of second toothed portions 210a continuously extended on the second outer circumferential surface 209 along the conveying direction MD ) At a predetermined pitch. A region between adjacent two second toothed portions 210a forms a second concave portion 210b and the plurality of second toothed portions 210a and the plurality of second concave portions 210b form a crossing Direction (CD).

An imaginary line (EL ₁₎ and a virtual line, as is clear from (EL _2), the first toothed part (207a) and a first recessed portion (207b) of the first roll 205 shown in FIG. 11, respectively, the 2 roll 208, and the second toothed portion 210a.

12, the first rolls 205 and the second rolls 208 sandwich the second nonwoven fabric 17 in the engaging regions of the tooth portions and the groove portions of the first rolls 205 and the second rolls 208, Specifically, a plurality of first bend sections 309 protruding toward the first rolls 205 and a second bend section 311 protruding toward the second rolls 208 are formed, Thereby forming a second nonwoven fabric 303.

Specifically, the portion of the second nonwoven fabric 17 between the first toothed portions 207a of the first rolls 205 is separated by the second toothed portions 210a of the second rolls 208, 2 from the lower surface 21 toward the second upper surface 19, that is, toward the first outer peripheral surface 206 of the first roll 205. Thereby, a plurality of first bending portions 309 are formed in the second nonwoven fabric 17.

The portion of the second nonwoven fabric 17 between the second toothed portions 210a of the second rolls 208 is separated by the first toothed portion 207a of the first rolls 205 from the second top surface 19 toward the second lower surface 21, that is, toward the second outer circumferential surface 209 of the second roll 208. Thereby, a plurality of second curved portions 311 are formed in the second nonwoven fabric 17.

To-mounted step (S ₂₎ in the second outer peripheral surface 209 of the first tooth portion (207a) and a second roll 208 of each of the plurality of the second bend section 311, the first roll 205, Press and compress. Thereby, the second curve portion 311 (particularly, the first toothed portion 207a of the first roll 205 and the second roll (the second roll) 208) is tended to be easily fixed to the second outer peripheral surface (209).

-Mounted step (S ₂₎ in a plurality of the first curved portion second tooth in each of the 309, the second roll 208, part (210a), a first roll 205, the first outer peripheral surface 206 of the It is preferable to compress it so as not to be crushed. As a result, the fibers constituting the first bend section 309 are hardly thermally welded, plasticized, and the like, and the structure of the first bend section 309 (particularly, the structure near the second bottom surface 21) is hard to be fixed. As a result, when the second roll 208 is separated from the first roll 205 after finishing the addition process (S ₂ ), by the repulsive force (or elastic force) of the fibers constituting the first curve portion 309, The structure of the first curve portion 309 of the second nonwoven fabric 17 (particularly, the structure near the second lower surface 21) is easily returned to the state before being engaged by the second toothed portion 210a.

The second lower surface 21 of the formed second nonwoven fabric 303 is held in contact with the second rolls 205 while the second upper surface 19 of the formed second nonwoven fabric 303 is in contact with the first rolls 205, (208). 13, the second upper surface 19 of the second nonwoven fabric 303 is continuously contacted with the first roll 205, so that the second upper surface 19 (see FIG. 13) of the first bend section 309 While the second bottom surface 21 of the first curve portion 309 tries to recover to its original shape, i.e., to recover its planar shape.

The temperature of the first roll 205 is preferably a first predetermined temperature which is higher than room temperature (for example, 25 ° C) and lower than the melting point of the lowest melting point component of the fibers constituting the second nonwoven fabric 17 . If the temperature of the first roll 205 is increased, the curved shape of the second upper surface 19 of the first bent portion 309 in the formed second nonwoven fabric 303 can be more stabilized have. The second bottom surface 21 is separated from the second roll 208 and the second bottom surface 219 of the first curved portion 309 is separated from the second bottom surface 219 by heat accumulated in the second nonwoven fabric 303, The recovery by the repulsive force (or the elastic force) can be assisted by the effect of volume recovery by heat.

The temperature of the second roll 208 is preferably at or above room temperature and at a second predetermined temperature below the first predetermined temperature. As a result, the secondary effect of the second roll 208 is lessened, the effect of volume recovery is enhanced, and the second bottom surface 21 of the first curved portion 309 of the second nonwoven fabric 303, It becomes easier to recover from the state.

The second roll 208 may be made of a dielectric material having no conductivity, for example, a synthetic resin (e.g., nylon). By doing so, by the friction between the second outer peripheral surface 209 of the second roll 208 and the formed second nonwoven fabric 303 when the second nonwoven fabric 303 is dropped from the second roll 208, By the generated static electricity, the fibers of the second lower surface 21 of the formed second nonwoven fabric 303 are attracted to the second roll 208. Thereby, the fibers of the second lower surface 21 of the second nonwoven fabric 303 are lifted in the direction of the second roll 208, so that the second lower surface 21 of the second nonwoven fabric 303, It can be restored to a smaller concave or planar shape. Thereby, in the joining step (S ₅ ) to be described later, the formed second nonwoven fabric 303 and the first nonwoven fabric 307 having the adhesive layer can be bonded so as not to create a gap therebetween. 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 can have no void portion.

The plurality of first bending portions 309 and the plurality of second bending portions 311 finally constitute the plurality of convex portions 25 and the plurality of concave portions 31 of the laminated nonwoven fabric 1 .

[Second volume recovery step (S ₃ )]

In the second volume recovery step (S ₃ ), heat treatment is performed to heat the first nonwoven fabric 305 recovered from the second material roll (not shown) before volume recovery to the second heat treatment apparatus 211, Nonwoven fabric 7 is formed. The second heat treatment apparatus 211 is a device for heat treating the sheet to recover the volume of the sheet and is the same as the first heat treatment apparatus 203. Specifically, the second heat treatment apparatus 211 applies heat to the first nonwoven fabric 305 before volume recovery while conveying the first nonwoven fabric 305 before volume recovery in the conveying direction MD, The volume of the first nonwoven fabric 305 is recovered, and the first nonwoven fabric 7 having the restored volume is formed.

In the second heat treatment apparatus 211, the first nonwoven fabric 305 before volume recovery is conveyed while adjusting the tension by a nip roll or the like provided at both ends of the conveying direction MD of the second heat treatment apparatus 211.

[Application step (S ₄ )]

In the application step (S ₄ ), the first nonwoven fabric 7 is supplied to the adhesive application device 213, and an adhesive is applied to the first upper surface 9 of the first nonwoven fabric 7 in a predetermined pattern, The first nonwoven fabric 307 is formed. The predetermined pattern may be, for example, a stripe pattern having a predetermined width, which extends along the conveying direction MD and is arranged at predetermined intervals in the transverse direction CD.

The adhesive is not particularly limited, and for example, a hot melt adhesive may be used.

[Joining step (S ₅ )]

In the bonding step (S ₅ ), the formed second nonwoven fabric 303 and the first nonwoven fabric 307 having the adhesive layer are supplied to the bonding region 221, and in the bonding region 221, 2 nonwoven fabric 303 and a first nonwoven fabric 307 having an adhesive layer are bonded to each other to form a laminated nonwoven fabric 1.

The bonding roll 215 is provided with an adhesive layer in the bonding region 221 between the bonding roll outer circumferential surface 216 and the first tooth portion 207a and the first concave portion 207b of the first roll 205 The first nonwoven fabric 307 and the formed second nonwoven fabric 303 are sandwiched and bonded. The joining 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 joining roll 215 has fins 217 intermittently arranged along the conveying direction MD (rotational direction) and the transverse direction CD (CD) on the joining roll outer peripheral surface 216 thereof.

A first toothed part (207a) of a virtual line (EL ₁₎ and a phantom line as is apparent from (EL _2), the bonding rolls 215, the pin 217 and the first roller 205 of the shown in Figure 11 is , So as to face each other. The fins 217 and the bonding roll outer circumferential surface 216 of the bonding roll 215 and the first toothed portion 207a and the first concave portion 207b of the first roll 205 are bonded to each other in the bonding region 221 The second lower face 21 of the formed second nonwoven fabric 303 and the first nonwoven fabric 307 having the adhesive layer sandwich the first nonwoven fabric 307 having the adhesive layer and the formed second nonwoven fabric 303 And the first nonwoven fabric 307 having the adhesive layer is bonded to the first nonwoven fabric 307 with the adhesive layer interposed therebetween. A first nonwoven fabric 307 having a formed second nonwoven fabric 303 and an adhesive layer is sandwiched between the pin 217 of the bonding roll 215 and the first toothed portion 207a of the first roll 205, And the embossed portion 41 (concave portion 31) is formed. Thus, the laminated nonwoven fabric 1 is produced.

The second upper surface 19 of the formed second nonwoven fabric 303 is held in contact with the first roll 205 in the joining region 221 so that the second upper surface 191 of the plurality of first bend portions 309 19 are liable to be retained. Further, since when the second of the second non-woven fabric 303 is ended shape of the 21 has been returned to-mounted step (S _2), then, the smaller concave or flat shape, in the bonding step (S _5), the The entire surface of the second lower surface 21 of the nonwoven fabric 17 and the entire surface of the first upper surface 9 of the first nonwoven fabric 7 can be easily bonded to each other with the adhesive layer 23 interposed therebetween.

In the case where the second nonwoven fabric 17 is a nonwoven fabric (for example, an air-through nonwoven fabric) manufactured by conveying a net image, the second nonwoven fabric 303 and the first nonwoven fabric 307 having an adhesive layer , And the non-net surface that did not contact the net constitutes the second bottom surface 21, so that the net surface contacting the net constitutes the second top surface 19.

The net surface has a higher fiber density of fibers constituting the nonwoven fabric than the non-woven surface, and the surface tends to be smooth. As a result, the shape of the second upper surface 19 of the first bend section 309 can be stably maintained after the addition step (S ₂ ).

On the other hand, in the second lower surface 21 of the first curve portion 309, since the fiber density is low, the volume is greatly restored, elastic deformation easily occurs in the thickness direction T, and plastic deformation such as bending Less fiber is produced. As a result, when the second roll 208 is dropped from the formed second nonwoven fabric 303 after the adhering step S ₂ , the repulsive force (or elastic force) of the fibers of the second lower surface 21 of the first curved portion 309, The second lower surface 21 of the first curve portion 309 can be made more flat, and the surface of the second lower surface 21 can be made fluffy. Therefore, in the laminated nonwoven fabric 1 to be formed, each of the plurality of convex portions 25 is liable to be solidified, and more specifically, each of the plurality of convex portions 25 is less likely to have a void portion.

The above-mentioned manufacturing method is a method in which the second nonwoven fabric is formed and the formed second nonwoven fabric is joined to the first nonwoven fabric (hereinafter sometimes referred to as " negative-working method ").

In the related art, a method for producing a laminated nonwoven fabric having a plurality of convex portions and a plurality of concave portions (hereinafter referred to as " concavo-convex structure "), (Hereinafter referred to as a " thermo-crimping method "), a method of producing a laminated nonwoven fabric having a concavo-convex structure by using a difference in thermal expansion (crimpability) , And a method of producing a laminated nonwoven fabric having a concave-convex structure by using a difference in thermal elongation between an upper layer and a lower layer (hereinafter referred to as " thermal stretching method ").

Compared with the fluid spraying method, the thermo-crimping method and the thermal stretching method, the negative-working method can use a commercially available nonwoven fabric as it is, so that the nonwoven fabric produced by the negative working method is advantageous in terms of cost. In addition, the negative-working method can be carried out by selecting various commercially available nonwoven fabrics which are easy to obtain, in accordance with desired functions (for example, liquid-absorbing property and soft feeling) of the laminated nonwoven fabric to be produced as compared with the fluid- It is advantageous in that it can be.

In addition, the negative-working method is advantageous in that it is possible to easily produce a laminated nonwoven fabric having a large thickness (large in volume) as compared with the fluid spraying method, the thermo-crimping method and the thermal stretching method.

<Laminated nonwoven fabric of the present disclosure>

The laminated nonwoven fabric of the present disclosure is a liquid permeable sheet for an absorbent article and may have a general basis weight as a liquid permeable sheet and may have a basis weight of, for example, 10 to 80 g / m 2 and preferably 20 to 50 g / Lt; / RTI &gt;

In the laminated nonwoven fabric of the present disclosure, the first nonwoven fabric and the second nonwoven fabric are not particularly limited, 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 by mass , And more preferably 40 to 60 parts by mass and 60 to 40 parts by mass (basis weight ratio). In the case where the laminated nonwoven fabric of the present disclosure comprises only the first nonwoven fabric and the second nonwoven fabric, the above "mass portion" can be read in terms of "% by mass".

In the present specification, the basis weight of a sheet material such as a laminated nonwoven fabric is measured as follows.

(1) Ten samples each having a size of 100 mm x 100 mm were taken from the sheet material, the mass of each sample was measured,

(2) By dividing the mass (g) of each sample by the area (m 2) of each sample, the basis weight of each sample is calculated.

(3) The average value of the basis weight of 10 samples in total is calculated, and the average value is employed as the basis weight.

In the present specification, the ratio of the first nonwoven fabric to the second nonwoven fabric is determined by spraying a cold spray or the like on the laminated nonwoven fabric, separating the first nonwoven fabric and the second nonwoven fabric from the laminated nonwoven fabric, The basis weight of each of the nonwoven fabric and the second nonwoven fabric can be calculated, and the ratio can be obtained from such basis weight.

In the laminated nonwoven fabric of the present disclosure, each of the first nonwoven fabric and the second nonwoven fabric is not particularly limited as long as it is used as a liquid-pervious sheet of the absorbent article. Examples thereof include air-through nonwoven fabrics, spun- A nonwoven fabric, a spun lace nonwoven fabric, a needle punch nonwoven fabric, a meltblown nonwoven fabric, and combinations thereof (for example, SMS). 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 to 10.0 dtex .

In each of the second nonwoven fabric portions of the convex portions of the laminated nonwoven fabric of the present disclosure, the fineness of the fibers on the second upper face is preferably lower than the fineness of the fibers on the second lower face. By doing so, the top portion of the convex portion is excellent in smoothness and the convex portion is excellent in cushioning feeling due to the difference between the fineness of the second upper surface and the fineness of the second lower surface.

From this point of view, the second nonwoven fabric may be characterized in that the second upper surface of the second nonwoven portion preferably comprises fibers having a fineness of 0.5-10.0 dtex, and more preferably 0.7-5.0 dtex, The second surface may be a nonwoven fabric containing fibers having a fineness of preferably 1.0 to 10.0 dtex, and more preferably 1.5 to 5.0 dtex. 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 nonwoven fabric can be adjusted by stacking a plurality of webs having different finenesses when fabricating the second nonwoven fabric.

In another embodiment of the laminated nonwoven fabric of the present disclosure, in each of the second nonwoven fabric portions of the convex portions of the laminated nonwoven fabric, the fineness of the fibers on the second upper face is the same as the fineness of the fibers on the second lower face, In the embodiment, the fineness of the fibers on the second upper surface is higher than the fineness of the fibers on the second lower surface.

It is preferable that the second nonwoven fabric is produced by conveying the net phase at the time of producing the nonwoven fabric and has a net surface. In the present specification, the net surface relating to the nonwoven fabric refers to the surface that was in contact with the net for transporting when the nonwoven fabric was produced.

The first nonwoven fabric and the second nonwoven fabric are also preferably volumetric recovery-treated nonwoven fabrics.

Examples of the non-woven fabric having the volume recovery property include nonwoven fabrics containing thermally stretchable fibers. Examples of the heat-stretchable fiber include those described in JP-A-2007-182662.

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

Examples of the plurality of convex portions and the plurality of concave portions each being a plurality of the ridges and the plurality of grooves include a plurality of convex portions and a plurality of concave portions each having a plurality of ridges and a plurality of grooves extending in the first direction, Each of the plurality of ridges and the plurality of grooves may be alternately arranged in the second direction orthogonal to the first direction. By doing so, when the user contacts the laminated nonwoven fabric along the first direction, the laminated nonwoven fabric can feel smoothness.

In the case where the plurality of convex portions and the plurality of concave portions are a plurality of ridges and a plurality of groove portions, the pitch of the plurality of ridges is preferably 1.0 to 10.0 mm, and more preferably 1.5 to 7.0 mm. From the viewpoint of liquid permeability and cushioning.

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. From the viewpoint of absorbency and cushioning. If the height of the web portion is excessively high, the liquid absorbency tends to deteriorate, and if the height of the web portion is excessively low, the cushion feeling tends to fall.

Each of the plurality of groove portions includes an embossed portion formed by embossing the first nonwoven fabric and the second nonwoven fabric. Embossing may also be performed by embossing the first nonwoven fabric and the second nonwoven fabric with an adhesive or the like interposed therebetween.

In each of the plurality of grooves, as shown in the first and third embodiments, the embossment portion may be continuously arranged in the first direction. By doing so, when the laminated nonwoven fabric is used as the liquid-pervious sheet of the absorbent article, the liquid reaching the skin contact surface of the liquid-permeable sheet is easily diffused along the embossed portion of the groove portion, It is difficult for the liquid to leak.

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 lowered, and when the laminated nonwoven fabric is used as the liquid-permeable sheet of the absorbent article, the wearer is less likely to feel stiffness in the absorbent article.

In the laminated nonwoven fabric of the present disclosure, each of the plurality of convex portions and the plurality of concave portions may be point-like in the planar direction as shown in the fourth embodiment. By doing so, the laminated nonwoven fabric tends to have particularly excellent air permeability in the plane direction.

The plurality of convex portions in a point shape can be arranged in a zigzag shape in the planar direction, for example. The plurality of concave portions may be arranged in a zigzag shape, for example, in the planar direction.

The pitch of the plurality of convex portions in a point shape is preferably 1.0 to 10.0 mm, and more preferably 1.5 to 7.0 mm. From the viewpoint of liquid permeability and cushioning.

The height of each of the convex portions in the form of a dot is preferably 0.3 to 10.0 mm, and more preferably 0.5 to 5.0 mm. From the viewpoint of liquid permeability and cushioning.

The heights of the convex portions and the plurality of concave portions are measured by immersing the laminated nonwoven fabric in liquid nitrogen, then dividing the laminated nonwoven fabric after immersion into two pieces, observing the end surface thereof with a microscope, for example, an electron microscope or an optical microscope , And the height is measured.

The height of the convex portion means the distance in the thickness direction between the apex which is the highest point of the convex portion in the upper surface of the laminated nonwoven fabric and the lower surface of the convex portion (the first lower surface of the first nonwoven portion). The height of the concave portion means the distance in the thickness direction between the apex which is the highest point of the concave portion in the upper surface of the laminated nonwoven fabric and the lower surface of the concave portion.

In the laminated nonwoven fabric of this disclosure, the apex of the upper surface of the convex portion (i.e., the second upper surface of the second nonwoven portion) is located at the center of the convex portion in the planar direction of the laminated nonwoven fabric It is preferable that they are arranged in the center.

In the laminated nonwoven fabric of the present disclosure, it is preferable that the second lower surface of the second nonwoven portion has a shape corresponding to the first upper surface of the first nonwoven portion. Even if the convex portion does not have the void portion or the convex portion has the void portion, the void portion is made small.

Each of the plurality of convex portions of the laminated nonwoven fabric of the present disclosure has a ratio of planar orientation fibers at the top portion of more than 50%, more preferably more than 60%, and more preferably more than 70%. By doing so, the top portion of the convex portion is excellent in smoothness.

Further, each of the plurality of convex portions of the laminated nonwoven fabric of the present disclosure has a ratio of the thickness direction oriented fibers in the side wall portion of more than 50%, more preferably more than 60%, and more preferably more than 70% . By doing so, the convex portion of the side wall portion is excellent in cushioning property due to the fibers oriented in the thickness direction.

It is particularly preferable that the above-mentioned ratio of the oriented fibers in the side wall portion in the thickness direction is satisfied in a range overlapping with the top portion of the convex portion and the thickness direction of the laminated nonwoven fabric. From the viewpoint of the cushioning property of the convex portion.

In the present specification, the ratio of the planar orientation fibers and the proportion of the orientation fibers in the thickness direction are measured as follows.

(1) A laminated nonwoven fabric is cut to prepare a sample.

(2) Using a digital microscope VHX-100 manufactured by KYENCE CO., LTD., An enlarged image is taken from a direction perpendicular to the cut surface of the sample. The enlarged image is an image magnified at a magnification that allows measurement of 50 or more fibers, and the enlargement magnification is, for example, 20 to 50 times. When photographing an enlarged image, focus on the frontmost fiber (except irregularly protruding fibers) of the cut surface of the burnt sample, and set the depth of field (depth). The enlarged image is created on the PC screen as a 3D image.

(3) A 3D image is converted into a 2D image, and a plurality of lines extending in parallel to the thickness direction of the sample are drawn on the 2D image, and an angle of more than -45 degrees and less than +45 degrees with respect to the thickness direction of the sample The number of oriented fibers (thickness direction oriented fibers) is counted.

(4) Similarly, a plurality of lines extending parallel to the plane direction of the sample are drawn on the 2D image, and fibers oriented at an angle of more than -45 degrees and less than +45 degrees with respect to the plane direction of the sample Fiber) is counted.

(5) From the number of oriented fibers in the thickness direction and the number of oriented fibers in the planar direction, their ratio is calculated.

(6) (1) to (5) are repeated ten times in total at different places of the convex portion, and an average value is adopted.

In each of the convex portions of the laminated nonwoven fabric of the present disclosure, it is preferable that the fiber density of the first nonwoven portion is higher than that of the second nonwoven portion. By doing so, when the laminated nonwoven fabric is press-fitted, the laminated nonwoven fabric is excellent in cushioning property. Further, since the laminated nonwoven fabric can draw the liquid reaching the upper surface (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, Liquid is excellent.

In the present specification, the fiber density means the mass of the fiber per unit volume.

The high and low fiber density can be measured by dipping the laminated nonwoven fabric in liquid nitrogen, then dividing the laminated nonwoven fabric after immersion into two pieces, and taking a plurality of photographs of the cross section with a microscope such as an electron microscope or an optical microscope, .

In the present specification, the maximum distance is determined by dividing the laminated nonwoven fabric in liquid nitrogen, then dividing the laminated nonwoven fabric after immersion into two pieces so as to pass the apex of the convex portion, and then measuring the cross section thereof with a microscope such as an electron microscope or optical Observation is made with a microscope, and the length of the cavity portion in the thickness direction is determined.

The maximum distance is indicated as D _max in Fig. 8, the maximum distance D _max is present at a position overlapping with the apex 53 of the convex portion 25 in the thickness direction T. As shown in Fig.

In the laminated nonwoven fabric of the present disclosure, the boundary between the first nonwoven portion and the second nonwoven portion in each of the plurality of convex portions may be, for example, in the case where the laminated nonwoven fabric includes an adhesive layer, Can be distinguished by coloring.

In addition, when the laminated nonwoven fabric does not include an additional layer between the first nonwoven portion and the second nonwoven portion, the boundary between the first nonwoven portion and the second nonwoven portion may be a boundary between the first nonwoven portion and the second nonwoven portion The type of fiber constituting the part, the fineness, the orientation, and the like.

The laminated nonwoven fabric of the present disclosure may have an adhesive layer between the first nonwoven fabric and the second nonwoven fabric. As the adhesive constituting the adhesive layer, those known as hot melt adhesives in the art can be given.

The adhesive layer may be applied over the whole area in the plane direction between the first nonwoven fabric and the second nonwoven fabric. Considering that the laminated nonwoven fabric of the present disclosure is used for the liquid-pervious sheet of the absorbent article, the adhesive is intermittently applied .

In the case where the laminated nonwoven fabric of the present disclosure has an adhesive layer between the first nonwoven fabric and the second nonwoven fabric, the adhesive layer is preferably arranged in a range overlapping with the apex of the convex portion in the thickness direction in the planar direction , More preferably in a range overlapping with the top of the convex portion in the thickness direction, and more preferably arranged in the entirety of the convex portion. From the viewpoint that the convex portion is made solid, more preferably the convex portion is not provided with the void portion.

When the laminated nonwoven fabric of the present disclosure includes the adhesive layer, the laminated nonwoven fabric may have a basis weight of preferably 2 to 10 g / m 2, and more preferably 4 to 7 g / m 2. The first nonwoven fabric portion and the second nonwoven fabric portion are bonded from each other without interfering with the permeability of the liquid.

In the laminated nonwoven fabric of this disclosure, at least a part of the first nonwoven portion of the plurality of convex portions has a first top portion and a first side wall portion, and the first nonwoven portion has a ratio of more than 50%, more preferably more than 55% , More preferably more than 60%, of the planar orientation fibers at the first peak. In addition, in the laminated nonwoven fabric of this disclosure, at least a part of the first nonwoven portion of the plurality of convex portions has a first nonwoven portion of more than 50%, more preferably more than 55%, and more preferably more than 60% Of the oriented fibers in the thickness direction. By doing so, the first nonwoven fabric portion acts as a base of the convex portion, and the convex portion, that is, the laminated nonwoven fabric, is excellent in cushioning property.

Further, the ratio of the planar orientation fibers and the proportion of the orientation fibers in the thickness direction are measured as described above.

In the laminated nonwoven fabric of the present disclosure, in each of the plurality of convex portions, the first top surface of the first non-woven fabric portion protrudes upward, and preferably the first top portion of the first non-woven fabric portion has a non- More preferably the first top portion of the first nonwoven portion coincides with the thickness direction of the laminated nonwoven fabric at the top of the convex portion and more preferably the first top portion of the first nonwoven portion coincides with the thickness direction of the first non- The vertex coincides with the vertex of the convex portion in the thickness direction of the laminated nonwoven fabric. From the viewpoint of the effect of the present disclosure.

In the laminated nonwoven fabric of the present disclosure, when at least a part of the first nonwoven portion of the plurality of convex portions has the first top portion and the first side wall portion, the first top portion and the top portion of the convex portion of the first non- , And it is more preferable that they coincide with each other. From the viewpoint of the effect of the present disclosure.

It is more preferable that the first side wall portion of the first nonwoven fabric portion and the side wall portion of the convex portion are overlapped in the thickness direction and substantially coincide with each other. From the viewpoint of the effect of the present disclosure.

It is preferable that the first peak of the first nonwoven fabric portion and the peak of the convex portion substantially coincide with each other in the thickness direction. From the viewpoint of the effect of the present disclosure.

In the laminated nonwoven fabric of the present disclosure, the height of the first peak of the first nonwoven fabric portion is preferably 5 to 90%, and more preferably 10 to 80% of the height of the convex portion to which the first nonwoven fabric portion belongs I have. By doing so, the convex portion tends to be excellent in cushioning property and liquid-absorbing property.

The height of the first vertex of the first nonwoven fabric portion means the distance between the first vertex and the first bottom surface in the thickness direction.

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 portion is preferably 1.5 to 100 times higher than the height of the first lowest point of the first upper surface of the first nonwoven portion , And more preferably 2 to 80 times higher. By doing so, the convex portion tends to be excellent in cushioning property and liquid-absorbing property.

The height of the first lowest point means the distance in the thickness direction between the first lowest point and the first lower surface of the first nonwoven fabric portion.

In the laminated nonwoven fabric of the present disclosure, it is preferable that at least a part of the plurality of convex portions, preferably, the first lower surface of the first nonwoven portion includes a flat region in all of the plurality of convex portions. By doing so, when the laminated nonwoven fabric of the present disclosure is used as a liquid-permeable sheet of an absorbent article, the transfer of liquid to the absorbent article is excellent.

In this specification, the flat region means a region where the height difference in the thickness direction between the highest portion and the lowest portion on any surface is 5% or less of the height of the convex portion.

The elevation difference is measured using a two-dimensional laser displacement meter. Examples of the two-dimensional laser displacement gauge include a high-precision two-dimensional laser displacement gauge LJ-G series (model: LJ-G030) manufactured by Keyence Corporation.

In the laminated nonwoven fabric of the present disclosure, in at least a part of the plurality of convex portions, at least a part of the plurality of convex portions, preferably all of the plurality of convex portions, the first lower surface of the first non- And a flat region in a range overlapping in the thickness direction of the laminated nonwoven fabric. From the viewpoint of the transferability of the liquid to the absorber when the laminated nonwoven fabric of this disclosure is used as the liquid-permeable sheet of the absorbent article.

The absorbent article to which the laminated nonwoven fabric of the present disclosure is used is not particularly limited, and examples thereof include a sanitary napkin, a panty liner, a disposable diaper, and a urine absorbent pad.

1: laminated nonwoven fabric
3: upper surface
5: when
7: First nonwoven fabric
8: First nonwoven portion
9: first upper surface
11: First
13:
15:
17: second nonwoven fabric
18: second nonwoven portion
19: second upper surface
21: The second
23: Adhesive layer
25:
27: Top
29:
31:
41: emboss part
43:
51:
53: Vertex
55: Lowest point
57: Middle surface
59: First vertex
61: first intermediate plane
63: 1st lowest point

Claims (12)

A laminated nonwoven fabric for a liquid-pervious sheet for an absorbent article, comprising a first nonwoven fabric and a second nonwoven fabric disposed above the first nonwoven fabric, the first nonwoven fabric having a thickness direction including an upward direction and a downward direction,
Wherein the laminated nonwoven fabric has a plurality of protrusions projecting upwardly, each of the protrusions having a top portion and a side wall portion, and each of the plurality of recesses includes an embossed portion of the first nonwoven fabric and the second nonwoven fabric and,
Wherein each of the plurality of convex portions comprises a first nonwoven fabric portion composed of a first nonwoven fabric and having a first upper surface and a first lower surface and a second upper surface and a second lower surface, And a second nonwoven portion constituting a top portion and a side wall portion,
The first upper surface of the first nonwoven portion protrudes upward, and
Wherein each of the plurality of convex portions has a ratio of fibers oriented in the plane direction in the top portion of more than 50% and a proportion of fibers oriented in the thickness direction in the side wall portion of more than 50% Wherein the laminated nonwoven fabric is a laminated nonwoven fabric. The method according to claim 1,
And the fineness of the fibers on the second upper surface is lower than the fineness of the fibers on the second lower surface in each second nonwoven fabric portion of the plurality of convex portions. 3. The method according to claim 1 or 2,
In each of the plurality of convex portions, the fiber density of the first non-woven portion is higher than that of the second non-woven portion. 4. The method according to any one of claims 1 to 3,
And at least a part of the plurality of convex portions is solid. 5. The method according to any one of claims 1 to 4,
Wherein the laminated nonwoven fabric further comprises an adhesive layer between at least the first nonwoven portion and the second nonwoven portion in at least a part of the plurality of convex portions. 6. The method according to any one of claims 1 to 5,
Wherein the first nonwoven fabric is an air-through nonwoven fabric. 7. The method according to any one of claims 1 to 6,
Wherein the second nonwoven fabric is an air-through nonwoven fabric disposed so that the second upper surface of the second nonwoven portion becomes an net surface. 8. The method according to any one of claims 1 to 7,
Wherein at least a portion of the first nonwoven fabric portion of the plurality of convex portions has a first top portion and a first sidewall portion, wherein the ratio of the fibers oriented in the plane direction in the first top portion of more than 50% Has a ratio of fibers oriented in the thickness direction in the first sidewall portion of the laminated nonwoven fabric. 9. The method according to any one of claims 1 to 8,
Wherein each of the plurality of convex portions extends in a predetermined direction. 10. The method of claim 9,
Wherein each of the plurality of recesses is a groove portion extending along the predetermined direction between adjacent two of the recesses and the recess portion includes the emboss portion intermittently arranged along the predetermined direction, Laminated nonwoven fabric. 11. The method according to any one of claims 1 to 10,
Wherein at least a part of the convex portions, the first lower surface of the first nonwoven portion includes a flat region. Use of the laminated nonwoven fabric according to any one of claims 1 to 11 as a liquid-permeable sheet of an absorbent article.

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