JPH0410992A - Screen printing plate - Google Patents

Abstract

PURPOSE:To enhance dimensional reproducibility and to form high density meshes by using a metal material low in stretchability as warp yarn and using a metal material high in stretchability as weft yarn and weaving the warp yarn and weft yarn. CONSTITUTION:A screen printing plate 1 used in screen printing is stretched by the large force applied in the sliding direction of a squeezee 5 by the sliding operation of the squeezee 5 at the time of printing. Therefore, when the material quality of warp yarns 2 arranged along the sliding direction is constituted of an amorphous alloy low in stretchability, the generation of the stretching of the screen plate 1 accompanied by the sliding operation of the squeezee 5 can be prevented. Herein, when both of warp and weft yarns are composed of the amorphous alloy, the screen plate of a #200 mesh or more can not be woven because of high hardness. When stainless steel yarn having stretchability higher than that of the amorphous alloy is used as the weft yarn 3, the screen printing plate 1 can be easily woven and an opening area of a #200 mesh or more can be realized.

Description

[Detailed Description of the Invention] [Summary] Regarding screen plate making composed of warp and weft threads made of metal materials, for the purpose of performing high-precision screen printing, screen plate making in which the warp threads and weft threads are woven together, A metal material with low elasticity is used as the warp, and a metal material with high elasticity is used as the weft.

[Industrial application field]

TECHNICAL FIELD The present invention relates to screen plate making, and more particularly to screen plate making composed of warp and weft yarns made of metal materials.

Generally, ceramic substrates are widely used as circuit boards on which semiconductor elements are mounted. Ceramic substrates have good properties in terms of heat resistance, heat dissipation, electrical properties, mechanical strength, etc. This ceramic substrate is manufactured by firing a green sheet.

In addition, in recent years, semiconductor devices have become highly integrated, and with this trend, ceramic substrates have been developed to achieve high integration by laminating multiple thin ceramic plates on which predetermined conductor patterns are formed. The conductor pattern described above is generally formed using screen printing.This screen printing prints a conductor pattern on a green sheet using a predetermined pattern or a pre-formed screen plate. If the conductor pattern is not printed accurately, the electrical characteristics of the ceramic substrate will be significantly degraded.

Therefore, there is a need for a vine screen plate making method that performs highly accurate screen printing.

The specifications of the stainless steel and amorphous alloy screen plates are shown in Table 1, and the printing conditions are shown in Table 2 (the warp and weft are made of the same material).

-Table 1- [Prior art] Screen plate making generally used for screen printing is
It has a woven structure of warp and weft threads. A variety of materials are available in each prefecture, but in recent years, screen printing using metal thread has become more popular due to its printing accuracy, durability, and dimensional stability. Further, as specific metal types, stainless steel, amorphous alloy, etc. are used, but conventionally both the warp and the weft have been made of the same material.

(Left below) Table 2- [Problems to be Solved by the Invention] However, in screen plate making where both the warp and weft are made of stainless steel, stainless steel has a property of having a higher elongation and being relatively easy to stretch than an amorphous alloy. Because there is #40
It is difficult to achieve an opening of 0 mesh or more. For this reason, stainless steel screen plate making inevitably results in a high mesh, making it impossible to apply a thick layer of conductive paste, and also requiring a large printing pressure due to the small opening area. Ta.

Further, as mentioned above, since the stainless steel screen plate has high elongation, the degree of deformation increases when the squeegee slides, resulting in a problem in that the transfer accuracy decreases.

On the other hand, in screen plate making where both warp and weft are made of amorphous alloy, the elongation of amorphous alloy is small, so #40
Is it possible to achieve the same transfer accuracy as stainless steel screen plate making with a mesh of 0 mesh or less? Since amorphous alloys have high hardness, it is difficult to create a mesh of #200 mesh or higher. #20
If the opening is about 0 mesh, the precision of the screen-printed conductor pattern will be low, and the electrical characteristics of the manufactured ceramic substrate will vary.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a screen plate making method that can perform highly accurate screen printing.

[Means to solve the problem]

In order to solve the above problems, the present invention uses a metal material with small elasticity as the warp (2) in screen printing in which the warp (2) and the weft (3) are woven together,
It is characterized in that the weft (3) is made of a highly elastic metal material.

Further, the warp (2) may be made of amorphous metal, and the weft (3) may be made of stainless steel.

[Effect]

By setting the screen plate making to the above configuration, the warp (2
) is made of an amorphous alloy with low elongation, so even when the squeegee slides, the screen plate does not stretch in the sliding direction, making it possible to improve transfer accuracy.

In addition, since the weft (3) is made of stainless steel with relatively high elongation, it is easy to weave in each prefecture and achieve a mesh with a high opening area, which also improves the accuracy of screen printing.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. 1st
The figure shows screen plate making which is one embodiment of the present invention. This screen plate-making l has a plate film formed thereon by a photochemical method (for example, a photographic method), and the 20-plate film is closed off except for images necessary to form a predetermined conductor pattern. There is. When printing, this screen plate making 1
As shown in FIG. 2, the screen is set on a green sheet 4, and a rubber squeegee 5 is slid under pressure from the top of the screen plate 1 to print copper paste 6 (which will become a conductive pattern) on the green sheet 4.

The present invention is characterized in that the warp threads 2 and the weft threads 3 constituting the screen plate making l are made of different materials. Specifically, the warp threads 2 were made of amorphous alloy, and the weft threads 3 were made of stainless steel. In this specification, the warp thread 2 refers to a thread along the sliding direction of the squeegee 5 (printing direction, indicated by arrow A in the figure), and the weft thread 3 refers to a thread that runs perpendicular to the sliding direction of the squeegee 5. . However, as shown in FIG. 1, generally each of the prefectures 2 and 3 is arranged so as to have a bias angle θ (for example, 22.5°) with respect to the sliding direction of the squeegee 5. Therefore, in the screen plate making 1 having a bias angle θ, the yarn with the smaller included angle where the sliding direction intersects with each prefecture 2°3 is called the warp yarn 2.

The screen plate 1 used in screen printing is stretched by applying a large force in the sliding direction of the squeegee 5 as the squeegee 5 performs a sliding operation during printing.

Therefore, by making the material of the warp threads 2 along this sliding direction an amorphous alloy with low elongation, that is, with low elongation, it is possible to prevent elongation of the screen plate making 1 due to the sliding movement of the squeegee 5. I can do it.

However, as described above, if both the warp and the weft are made of amorphous alloy, the amorphous alloy has a high hardness and cannot be woven with a screen plate of #200 mesh or more.

Therefore, in the present invention, a stainless steel thread having more elongation than an amorphous alloy was used as the weft thread 3.

As a result, the warp threads 2. Compared to a structure in which only amorphous alloy is woven into both the weft threads 3 and 3, it becomes possible to weave the screen plate l more easily, and it is possible to realize an opening area of #200 mesh or more.

The specifications of the screen plate making 1 according to the present invention are shown in Table 3, and the printing conditions thereof are shown in Table 4.

As mentioned above, by making the warp 2 made of an amorphous alloy, elongation of the screen plate 1 during printing is prevented, so transfer accuracy can be improved and highly accurate screen printing can be performed. In addition, by making the weft thread 3 made of stainless steel, it is possible to realize an opening area of #200 mesh or more, and this also makes it possible to improve the precision of screen printing.

(Margin below) -Table 3-

[Brief explanation of drawings]

FIG. 1 is an enlarged view showing screen printing, which is an embodiment of the present invention, and FIG. 2 is a diagram for explaining screen printing. In Table 4--Figure, 1 is a screen plate, 2 is a warp, 3 is a weft, and 5 is a squeegee. [Effects of the Invention] As described above, according to the present invention, it is possible to form a high-density mesh using a material with high dimensional reproducibility, so that screen printing with a high degree of transfer can be performed.

Claims (2)

[Claims] (1) In screen printing in which warp (2) and weft (3) are woven, a metal material with low elasticity is used as the warp (2), and a metal material with high elasticity is used as the weft (3). Screen printing is characterized by its unique features. (2) The screen plate making according to claim 1, wherein the warp (2) is made of amorphous metal, and the weft (3) is made of stainless steel.