JPH0791755B2 - Support for manufacturing open-pore nonwoven fabric - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a support for producing an apertured nonwoven fabric, and more specifically, a nonwoven fabric having an apertured pattern obtained by rearranging fibers of a fiber web with a high-speed fluid. It relates to the support having a three-dimensional network structure for supporting the fibrous web when manufactured.

(Prior Art) Conventionally, when fibers of a fibrous web are rearranged at the same time as the entanglement with a high-speed fluid or pre-entangled fibers are rearranged to produce a nonwoven fabric having an opening pattern, the support or back of the fibrous web is used. As a patch (hereinafter collectively referred to as a holding body),
The use of three-dimensional network structures is known.

For example, in Japanese Examined Patent Publication No. 44-23909, there are two typical examples of a so-called mesh support in which at least one of the graticule wires is bent in a knuckle state, and a support in which the voids of such a mesh support are filled with tapered projections. A three-dimensional network structure is disclosed.

(Problems to be Solved by the Invention) However, in the mesh support, since the effective height of the ridge formed by the knuckle is substantially equal to the wire diameter of the wire rod in the knuckle state, the knuckle on the support is Insufficient to give a high rearrangement force to the fibers of the fibrous web under high speed fluid, and this becomes more remarkable when it becomes a high mesh having a small wire diameter.

On the other hand, in the support in which the protrusions are filled in the voids of the mesh support, since the porosity is low, turbulent flow easily occurs during the treatment of the fibers of the fiber web on the support under high-speed fluid, The texture of the web is disturbed. Also,
The manufacturing of the support is tedious and expensive.

An object of the present invention is to provide a support for producing an apertured non-woven fabric having a three-dimensional network structure, which can solve such conventional problems.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the support for producing an apertured non-woven fabric of the present invention is such that at least the ridges on the surface of the mesh base material woven with the graticule wire are plated. By rubbing, a semi-elliptic spherical shape or a semi-spherical projection is provided, and the projection is formed so that the intersection of the longitude and latitude wire is a continuous surface, in other words, it is not a stepped surface. ing.

In a preferred embodiment, the ridge of the reticulated base material is formed by a knuckle state of at least one of the latitude and longitude wire rods, the wire diameter of the wire rod in this knuckle state is 0.34 mm or less, and The effective height of the protrusion is 1.2 times or more of the wire diameter, the wire diameter of the wire material in the knuckle state exceeds 0.34 mm, and the effective height of the protrusion is 1.1 times or more of the wire diameter. is there.

(Example) In FIGS. 1 to 3, a support according to an example is
Meridional wire 11a and weft wire 1 which are made of metal and have the same wire diameter
A mesh-like base material 10 of about 25 mesh plain-woven with 1b is provided.
On the surface of the mesh base material 10, a knuckle-shaped ridge 12 is formed by the portion of the meridional wire 11a that intersects with the latitude wire 11b, and the ridge is substantially equivalent to the warp of the meridian wire 11a. Has an effective height H ₁ . A protrusion 13 is formed at the intersection of the meridional wire 11a and the latitude wire 11b. However, this protrusion 13
Is shown in phantom in FIG. 1 to clearly indicate the intersection where it is located. The protrusion 13 has a semi-elliptical shape whose long side is the line direction of the meridional wire 11a, and gradually expands downward from the apex (see FIG. 2). The projecting portion 13 also fills the V-shaped groove between the two wire rods on both side edges in the line direction of the latitude wire rod 11 at the intersection of the warp wire rods 11a and 11b (see FIG. 3).

As described above, the support body is provided with the protrusions 13 having the effective height H which is larger than the effective height H ₁ of the ridges 12 by the height H ₂ , and the protrusions allow the longitude / lathe wire 11a, The intersection of 11b is formed as a continuous surface.

In the production of such a support, in addition to the mesh-like base material 10 which is a plain weave shown in the figure, a metal wire is woven into the weft to form a ridge at at least one of the two wire rods at the intersection of the surface and the wire rods. Various three-dimensional network structures such as twill weave (twill weave), satin weave, double weave, and triple weave are used. The protrusions 13 are formed by plating the reticulated base material 10 typically shown as such a three-dimensional reticulated structure, and for example, the following method can be adopted.

(1) The entire surface of the net-like substrate 10 is plated to preferentially grow the ridges 12 of the net-like substrate.

(2) After applying a resist coat to the net-like base material 10 excluding the ridges 12 and then plating the ridges to grow the ridges,
The resist coat is removed.

Of course, these methods may be used alone or in combination depending on the selection of the reticulated base material 10, but the use of the above (2) is preferable because the effective height H of the protrusions 13 and the arrangement pattern can be selected. The effective height H ₁ (curvature) of the ridge 12 is 0.34 mm
In the following cases, at least the method (2) is used. With the above method (1) alone, metal electrodeposition is almost uniformly carried out over the entire surface of the reticulated base material 10, preferential growth of the ridges 12 is not obtained, and the effective height H of the protrusions 13 is increased. Not much improved. With the method (2) alone, a step can be formed between the ridge 12 and the mesh-like base material 10. Therefore, after the method (2), the method (1) is used or a resin is used. It is desirable that the ridge and the mesh base material form a smooth continuous surface by coating.

Metals such as stainless steel and non-conductive or conductive polymer materials such as nylon and polyester are used as materials for forming the reticulated base material 10. Copper, nickel plating, composite plating, plastic plating, etc. are known to these. Various metals are electrodeposited by means.

The sharpness of the aperture pattern in the fibrous web provided by the support depends not only on the effective height H of the projections 13 of the support but also on its shape. The shape of the protrusions 13 is preferably a semi-spherical shape or a semi-elliptical shape in order to facilitate the movement of fibers and to make the shape of each opening edge of the manufactured nonwoven fabric uniform.

In the metal electrodeposition method, metal precipitation tends to concentrate on the ridges 12 of the reticulated substrate 10, but the effective height H ₁ of the ridges is 0.
When the thickness is 34 mm or less, this tendency is weakened, and the ridge cannot be effectively grown by the whole surface plating (method (1) above). When the plating treatment is performed by the method of (2) above, the protrusion 13 which is the metal coating portion has the effective height of the ridge 12 of the mesh base material 10.
When it is set to 20% or more of H ₁ , the effective height H and shape of the protrusion are improved. As the protrusion 13 increases, its shape changes from a semi-elliptical sphere to a hemisphere. Mesh base material
When the effective height H ₁ of the 10 ridges 12 exceeds 0.34 mm,
When the plating is applied by the method (1) or (2) so that the effective height H of the protrusion 13 is 10% or more of the effective height H ₁ of the ridge, the effective height of the protrusion 13 is increased. The height H and the shape are improved. In this way, the effective height H of the protrusion 13 is determined by using the electrodeposition method.
In order to improve both the shape and the shape at the same time, the minimum design of the protrusion according to the effective height H ₁ of the ridge 12 is required.

It is also necessary to properly combine the methods (1) and (2) to control so that the growth of the protrusions does not proceed in the lateral direction and the porosity is not significantly reduced.

In FIG. 4, the support of the embodiment is shown. However, the projection 13 located at the intersection of the graticule and the wire in the mesh-shaped base material 10 of this support has a shape as shown in the first illustration, although both sides thereof are shining white due to the light rays. Then, a fibrous web was placed on the support, and the fibers were entangled by a high-speed water stream, and at the same time, a perforated pattern was imparted to obtain the nonwoven fabric shown in FIG.

FIG. 6 shows a conventionally known mesh support in which the protrusion 13 is not formed. And
As a comparative example, a nonwoven fabric shown in FIG. 7 was obtained by treating a fibrous web with this support under the same conditions as in the above-mentioned examples.

As is clear from both of the non-woven fabrics shown in FIGS. 5 and 7, the non-woven fabric of the example has a very clear aperture pattern as compared with that of the non-woven fabric of the comparative example.

(Effect of the Invention) According to the support of the present invention, a semi-elliptic spherical or hemispherical protrusion is provided on the ridge on the surface of the reticulated substrate, and the porosity of the reticulated substrate is Since there is almost no decrease due to the presence of the protrusions, it is possible to give a high rearrangement force to the fibers of the fiber web on the protrusions under the action of the high-speed fluid, and the disturbance of the texture of the web due to the turbulent flow hardly occurs. As a result, a nonwoven fabric having a clear open hole pattern can be manufactured. Moreover, since the crossing portion of the grid-like material of the net-shaped substrate in which the projection portion is located is covered with the projection portion, the fibers do not become entangled in at least the crossing portion, and the finished nonwoven fabric of the present invention is supported. The texture is not disturbed when peeled from the body. Further, since the protrusions are formed on the reticulated base material by the electrodeposition method, the support of the present invention can be manufactured easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a plan view of a support body according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line 1-2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG.
FIG. 4 is a plan view of the structure of the support, FIG. 5 is a plan view of the structure of the perforated nonwoven fabric manufactured by using the support of FIG. 4, and FIG. 6 is a conventionally known mesh support. FIG. 7 is a plan view of the structure of the open-pore nonwoven fabric produced by using the support of FIG. 6. 10 …… Mesh base material 11a …… Meridional wire 11b …… Weft wire material 12 …… Raised part 13 …… Projection part

Claims (4)

[Claims] 1. A semi-elliptical spherical or hemispherical projection is provided by plating at least the ridges on the surface of a mesh base material woven with a graticule wire, and the projection is provided. The part is formed so that the intersecting part of the above-mentioned latitude and longitude wire becomes a continuous surface, The support for producing an open-pore non-woven fabric. 2. The support for producing a perforated nonwoven fabric according to claim 1, wherein the ridge portion of the reticulated base material is formed by at least one of the knuckle states of the weft wire. 3. The wire diameter of the knuckle wire is 0.34
mm or less, and the effective height of the protrusion is less than the wire diameter.
The support for producing an apertured nonwoven fabric according to claim 2, which is 1.2 times or more. 4. The wire diameter of the knuckle wire is 0.34
mm, and the effective height of the protrusion is 1.1 of the wire diameter.
The support for producing an apertured non-woven fabric according to claim 2, which is more than double.