JP2009149024A - Mesh fabric and screen printing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mesh fabric that makes screen printing performed free from blurs even on a minute pattern and also performed with high dimensional accuracy. <P>SOLUTION: This is a mesh fabric 11 formed by interlacing with the warps 12 and the wefts 13 wherein the warps 12 and the wefts 13 are composed of high-strength stainless steel wires having a tensile strength of ≥2,500 N/mm<SP>2</SP>and a diameter of 14-20 μm. The mesh fabric 11 is twilled, with a space factor set at ≤50%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mesh fabric used for screen printing, and more particularly to a mesh fabric and a screen printing plate that enable fine patterns to be printed accurately without bleeding.

  Screen printing has been widely used as a method for pattern printing with high accuracy at low cost, for example, in the manufacture of chip capacitors and color PDPs.

  The mesh fabric of the screen printing plate used for the screen printing includes a synthetic fiber fabric and a metal wire fabric, both of which are formed by plain weaving. Plain weaving is a weaving method in which meridians and latitudes are woven up and down at a glance.

  Incidentally, screen printing is performed in the order of plate making and printing. In plate making, a photosensitive emulsion is coated on a mesh fabric stretched in a frame and dried, and then a printing pattern as a photomask is closely exposed and developed to form a negative image. Then, the paste is passed through the part where the mesh is exposed and printed as the same positive image as the mask part.

  For this reason, the structure of the mesh fabric has a great influence on the accuracy of screen printing, dimensional accuracy, bleeding, printing thickness, and the like.

  In order to perform desired printing, various devices as disclosed in, for example, Patent Documents 1 to 4 below have been made on mesh fabrics.

  The mesh fabric disclosed in Patent Document 1 is for obtaining a larger printed film thickness. The mesh fabric is made thicker by changing the strengths of the meridian and the parallel to be plain woven.

  The mesh fabric disclosed in Patent Document 2 has a high opening ratio (space ratio) so that a paste having a high viscosity can be used. Specifically, the number of meshes of the mesh fabric is reduced from 70 / inch to 200 / inch and the wire diameter is reduced from 16 μm to 30 μm.

  The mesh fabric disclosed in Patent Document 3 has a high opening rate (spatial ratio) in order to eliminate printing blur.

JP 2003-268649 A JP-A-8-238862 JP 2005-125547 A

  However, in order not only to eliminate blurring and blurring but also to print fine patterns precisely, a mesh fabric woven with high density is required. To achieve high density, both the meridian and latitude lines must be thin.

As a conventional high density mesh fabric, a stainless steel wire with a tensile strength of 600-1500 N / mm ² is used. When the number of meshes is 500 mesh, a wire with a diameter of 19 μm is 640 mesh. In the case of 840 mesh, a wire having a wire diameter of 15 μm is used.

However, only a wire having a tensile strength of about 600 to 1500 N / mm ² can be used for this wire as described above. This is due to the plain weave structure.

  That is, in plain weave, as shown in FIG. 3 ((a) is a plan view and (b) is a BB partial cut end view in (a)), the period is twice the period of adjacent lines. The same mesh pattern is repeated at p. For this reason, the latitude line 101 bends up and down in a shape similar to that of one period of the sine wave, and the top and bottom vertex portions 101a of the latitude line 101 have the largest curvature. The same applies to the meridian 102.

  However, since the high-strength wire is hard, if it is finely woven as shown in FIG. 3, the curvatures of the apex portions 101a and 102a above and below the meridian 102 and the latitude line 101 become large and cracks occur. For this reason, in the current plain weave, the opening ratio is as large as 60%, such as 290 mesh when the wire diameter is 20 μm and 360 mesh when the wire diameter is 16 μm. . For this reason, there has been a problem that blurring increases when trying to print a fine pattern.

  On the other hand, if a wire having a small wire diameter and a low tensile strength of the wire is used, the strength naturally decreases and the dimensional system of the pattern also decreases. To prevent this, wires with the highest possible strength must be used.

  Therefore, an object of the present invention is to provide a mesh fabric and a screen printing plate that can perform printing with high dimensional accuracy and have high strength.

Means therefor are mesh fabrics formed by weaving meridians and latitudes, wherein the meridians and latitudes are made of high-strength stainless steel wires having a tensile strength of 2500 N / mm ² or more and are formed by twill. Mesh fabric.

  The space ratio is preferably 50% or less. Preferably, it is good to be 38% to 50%.

  Further, it may be a mesh fabric that is rolled after weaving and set to a thickness that is twice or less the diameter of a meridian or parallel. The thickness of the mesh fabric is made uniform by rolling, and the dimensional accuracy is improved. In particular, since weaving is performed in a twill weave, since the cycle of the repeated pattern of meridians and latitudes is long, the effect is great in improving the dimensional accuracy.

  Furthermore, the meridian and the latitude line may be a mesh fabric set to the same diameter of 14 μm to 20 μm.

  Another means is a screen printing plate in which the mesh fabric is stretched in a frame.

  As described above, according to the present invention, since the period of undulation above and below the meridian and the parallel is greater than that in the case of plain weave, the curvature of each line is reduced even with the same number of meshes. As a result, it is possible to form a mesh fabric having fine meshes with a low space ratio, with a larger number of meshes than in the case of plain weave.

  For this reason, it becomes possible to print a fine pattern precisely. In addition, bleeding and the like can be prevented by making the lower limit of the space ratio appropriate.

Moreover, since the high intensity | strength wire is used, the intensity | strength of a mesh fabric is securable.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a plan view and a cross-sectional view of a mesh fabric 11 that is stretched and used on a screen printing plate (not shown because of its well-known structure). The cross-sectional view is an AA section cut end view of FIG.

  As shown in this figure, the mesh fabric 11 is formed by twilling meridian lines 12 (vertical direction in the drawing) and latitude lines 13 (horizontal direction in the drawing). In the illustrated example, a 2 × 2 twill weave is shown, but other types of twill may be used. In FIG. 1, p indicates a repeating unit of the mesh pattern.

The same high-strength stainless steel wires are used for the meridians 12. The stainless steel wire used has a tensile strength of 2500 N / mm ² or more. The wire diameter D is 14 μm to 20 μm, and the mesh fabric 11 has a space ratio of 50% or less.

  Here, the space ratio is obtained by the following equation.

Using a high-strength stainless steel wire having a tensile strength of 3000 N / mm ² and a wire diameter D of 19 μm, a 500-mesh mesh fabric 11 was manufactured using a 2 × 2 twill weave as shown in FIG.
The porosity of the mesh fabric 11 is about 39%.

Using a high-strength stainless steel wire having a tensile strength of 3000 N / mm ² and a wire diameter D of 20 μm, a 400-mesh mesh fabric 11 was manufactured using a 2 × 2 twill weave as shown in FIG.
The porosity of the mesh fabric 11 is about 47%.

  The mesh fabric 11 shown in Example 1 and Example 2 above is woven, rolled by calendaring, post-processed so that the thickness t is less than twice the wire diameter D, and rolled mesh fabric 11a. Got. As shown in FIG. 2 (a), the mesh fabric 11 before rolling had a thickness t1 that was 2.1 to 2.9 times the wire diameter D, but two types of rolling with different degrees were performed. As a result, the thickness t was less than twice the wire diameter D as shown in FIGS. 2 (b) and 2 (c). The thickness t is in the range of 1 to 2 times the wire diameter D.

Since the mesh fabric of each of the embodiments is woven by twill weave, the period of waving up and down the meridians 12... And the wefts 13 is larger than that in the case of plain weave. Upper and lower vertex portions 12a, 13a in ...
The curvature of becomes smaller. As a result, the mesh fabric 11 or the rolled mesh fabric 11a having fine meshes with a low space ratio can be formed with a larger number of meshes than in the case of plain weave.

  When the mesh woven fabric 11 and the rolled mesh woven fabric 11a shown in each of the above-described examples were each printed on a screen printing plate, printing was performed with high dimensional accuracy without bleeding even with a fine pattern.

  Moreover, since the unprecedented high strength stainless steel wire is used, the strength of the mesh fabric 11 and the rolled mesh fabric 11a is high, and good durability can be obtained. it can.

  Further, in a screen printing plate using a mesh fabric obtained by weaving a normal strength stainless steel wire, the clearance, which is the distance between the plate and the substrate, is approximately 1/300 of the inner dimension of the frame of the screen printing plate. In the case of a screen printing plate of 1 m × 1 m, it is set to about 3 mm. However, when the mesh fabric of each of the above embodiments is used, the mesh fabric does not undergo plastic deformation, so the clearance is about 6 mm. It can also be printed. For this reason, it is possible to print cleanly with the same positional accuracy regardless of how many times printing is performed. As a result, it is possible to print a paste having a relatively high viscosity for fine patterns with a large clearance and good release.

  Furthermore, in the case of the rolled mesh fabric 11a to which the rolling process is applied as in the third embodiment, the thickness of the rolled mesh fabric 11a becomes uniform and the dimensional accuracy of the rolled mesh fabric 11a itself is improved. Although it is a twill weave, there is a float, but since this float is more stable, the improvement in dimensional accuracy is exceptional.

In correspondence between the configuration of the present invention and the configuration of the above-described embodiment,
The mesh fabric of this invention corresponds to the mesh fabric 11 and the rolled mesh fabric 11a described above,
The present invention is not limited to the above-described configuration, and other forms can be adopted.

The top view and sectional drawing of a mesh fabric. Sectional drawing of a mesh fabric. Sectional drawing of the conventional mesh fabric.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Mesh fabric 11a ... Rolled mesh fabric 12 ... Meridian 12a ... Vertex 13 ... Latitudinal line 13a ... Vertex

Claims (5)

A mesh fabric formed by weaving meridians and latitudes,
The meridian and the latitude are composed of a high strength stainless steel wire having a tensile strength of 2500 N / mm ² or more,
Mesh fabric formed by twill. The mesh fabric according to claim 1, wherein the space ratio is 50% or less. The mesh fabric according to claim 1 or 2, wherein the mesh fabric is rolled after weaving and is set to a thickness that is not more than twice the diameter of a meridian or parallel. The mesh fabric according to any one of claims 1 to 3, wherein the meridian and the latitude are set to have the same diameter of 14 µm to 20 µm. A screen printing plate in which the mesh fabric according to any one of claims 1 to 4 is stretched in a frame.

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