JPH0241916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a thick film printing apparatus used for forming conductor or insulator thick film members on an insulating plastic film using screen printing technology.

BACKGROUND ART Conventionally, this type of thick film printing apparatus has been constructed as shown in cross-sectional views in FIGS. 3 and 4. This will be explained below with reference to the drawings. FIG. 3 is a diagram for explaining the principle of screen printing technology, and FIG. 4 is a detailed description of the thick film printing apparatus shown in FIG. 3. In FIG. 3, 11 is a squeegee, 12 is a conductive or insulating paste, 13 is a plate frame on which a printing plate is stretched, 18 is a printing table on which an insulating plastic film 17 is set, and 20 is an insulating plate. A thick conductive or insulating film printed on plastic film. In Figure 4,
30a is a stainless steel screen, 30b is a plate coating, 40a, 40b, 40c, 40d
is an opening in the plate coating 30b.

The operation of the conventional thick film printing apparatus configured as described above will be described below. Conductive or insulating paste 1 supplied on plate surface 30
2, the openings 4 of the plate coating 30b are removed by the squeegee 11 moving (in the direction A in the figure) while pressing the plate surface 30, that is, the stainless steel screen 30a.
A conductive or insulating paste 12 is discharged from 0a to 40d, and an insulating plastic film 1
A thick film printed portion 20 is formed on the surface 7 .

Problems to be Solved by the Invention However, in the above configuration, defects as shown in FIG. 5 occur. This will be explained below with reference to the drawings. FIG. 5 is a front view showing an insulating plastic film printed by a conventional thick film printing apparatus. In FIG. 5, 17 is an insulating plastic film, and 20a to 2
0c is a printed conductive or insulating thick film printed portion, and 50 and 60 are the thick film printed portions 20a.
This is a defective part consisting of ~20c just before the shot and a defective shot.

These defective parts occur for the following reasons.

In other words, insulating plastic film has great electrical insulation properties and a very high specific resistance, so it is easily charged with static electricity, and it does not easily leak. Therefore, the static electricity charged in the process before printing on the insulating plastic film causes printing failures during screen printing, resulting in defective areas 50 and 6.
It becomes 0.

As a countermeasure against this problem, the static electricity charged on the insulating plastic film is generally removed using a static eliminator immediately before printing, but this is a very difficult task.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a thick film printing apparatus that has a simple configuration and can perform good screen printing.

Means for Solving the Problems In order to solve the above problems, the thick film printing apparatus of the present invention electrically connects one end of a metal plate frame equipped with a stainless steel screen printing plate and one end of a metal printing table. It has a configuration that is earthed.

Effects According to the present invention, the static electricity charged on the insulating plastic film is sandwiched between the stainless steel screen printing plate and the metal printing stand that are in contact with the plastic film due to the pressure of the squeegee during screen printing. This can be removed because it is electrically grounded.

Embodiment A thick film printing apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a thick film printing apparatus in a first embodiment of the present invention. In Fig. 1, 1 is a squeegee;
2 is a conductive or insulating paste, 3 is a metal plate frame covered with a stainless steel screen 4, 5 is a plate coating, 6 is an insulating plastic film, 7 is a metal printing stand, 8 is grounded from one end of the metal plate frame 3, and 9 is grounded from one end of the metal printing table.

The operation of the thick film printing apparatus configured as described above will be described below with reference to FIGS. 1 and 2. First, FIG. 2 is a front view showing a good thick film printing section obtained using the thick film printing apparatus according to the present invention.

The conductive or insulating paste 2 supplied onto the stainless steel screen 4 is removed from the openings of the plate coating 5 by the squeegee 1, which moves while pressing the stainless steel screen 4 (in the direction B in the figure). The insulating paste 2 is discharged, and thick film printing parts 2a to 2 are formed on the insulating plastic film 6.
c is formed.

As described above, according to this embodiment, in a thick film printing apparatus that performs thick film printing on an insulating plastic film, one end of a metal plate frame equipped with a stainless steel screen printing plate used for the thick film printing is provided. By electrically grounding one end of the metallic printing table, static electricity charged on the insulating plastic film can be removed from the insulating film by pressing a squeegee during screen printing in the pre-process of thick film printing. The plastic film can be removed by sanding the stainless steel screen printing plate and the metal printing stand that are in electrical contact with the plastic film, and printing problems due to static electricity will not occur.

In the above embodiment, one end of the metal plate frame equipped with the stainless steel screen printing plate and one end of the metal printing table are electrically grounded, but the metal plate equipped with the stainless steel screen printing plate A similar effect can be obtained by grounding only one end of the frame.

Further, although the stainless steel screen 4 is used in the above embodiment, it is not limited to a stainless steel screen, and may be a conductive material whose surface is plated with metal, such as Tetron, nylon, or silk.

Effects of the Invention As described above, the present invention has one end of a metal plate frame equipped with a stainless steel screen printing plate and one end of a metal printing stand grounded, thereby dissipating static electricity charged on an insulating plastic film. The film can be removed at the same time as printing, and printing problems caused by the static electricity do not occur.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a thick film printing device according to a first embodiment of the present invention, FIG. 2 is a front view showing good printing in the thick film printing device of FIG. 1, and FIG. 3 is a conventional thick film printing device. FIG. 4 is a sectional view showing the principle of the printing apparatus, FIG. 4 is a detailed sectional view of FIG. 3, and FIG. 5 is a front view showing printing including defects in a conventional thick film printing apparatus. 3...Metal plate frame, 4...Stainless steel screen, 7...Metal printing stand, 8, 9...Earth grounding.

Claims (1)

[Claims] 1 A thick film printing device that performs thick film printing on an insulating plastic film, which includes one end of a metal plate frame equipped with a stainless steel screen printing plate used for the thick film printing and one end of a metal printing table. A thick film printing device that is electrically grounded.