JPS58102797A - Plate for printing - Google Patents

Abstract

PURPOSE:To prevent the exudation of ink, and to execute stable distinct printing by forming convex sections continuing to the outlet side edge sections of an ink passing section. CONSTITUTION:The convex sections 8 continuing to the outlet side edge sections of the ink passing section 3 from which printing ink 6 is extruded are formed. The convex sections 8 are shaped in such a manner that a photosensitizer 2 is applied onto a gauze cloth 1, the photosensitizer 2 is removed in the form of a picture, characters, etc. required, the ink passing section 3 is shaped, a photosensitizer is applied on to the surface of the photosensitizer 2, and the photosensitizer applied at the second time is removed while leaving only the forming sections of the contour-shaped convex sections 8. It is preferable that the width of the convex sections 8 is narrower and their height higher as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing plate used for printing, for example, a printer resist on a printed circuit board, and is designed to easily prevent bleeding due to printing.

Generally, screen printing plate A is made by applying a photosensitizer 2 to a gauze 1 made of silk, Tetoron, etc., and then removing the photosensitizer 2 in the form of images, letters, etc., as shown in FIG. The screen frame 4 has a structure in which a screen frame 4 is formed and stretched over the screen frame 4.

In this screen printing plate A, as shown in FIG.
When printing on the printed circuit board 6 provided with the screen printing plate A, the screen printing plate A is placed on the printed circuit board 6, and the printing ink 6 is pushed out from the top of the gauze 1 through the ink passage part 3 with a squeegee 7. The printing ink 6 was transferred onto the printed circuit board 5.

However, the screen printing plate A is formed to have a uniform thickness over the entire surface, and therefore, as the number of times of printing is repeated, ink will flow between the back side of the screen and the printed circuit board 5, causing the ink to flow to the exit of the ink passage section 3. It spreads to the edges, resulting in smearing.

This bleeding became worse and more widespread as the number of printings increased.

The present invention eliminates such conventional disadvantages, and one embodiment thereof will be described below with reference to FIG. 3.

In FIG. 3, the same components as those in the conventional configuration in FIGS. 1 and 2 are designated by the same numbers. A continuous convex portion 8 is formed.

To form the convex portions 8, first, the photosensitive agent 2 is applied to the gauze 1, and the photosensitive agent 2 is removed in the form of necessary images, characters, etc. to form the ink passage portions 3, and then the photosensitive agent 2 is further applied to the gauze 1. This can be done by applying a photosensitizer to the aging surface of the substrate, and removing the second application of the photosensitizer, leaving only the areas where the contoured convex portions 8 are formed.゛It is desirable that the width of the convex portion 8 is as narrow as possible, and that the height is as high as possible.

By forming the continuous convex part 8 on the outlet side edge of the ink passage part 3 in this way, the convex part 8 prevents the ink from seeping out during printing, and even after repeated printing, almost the initial state is maintained. It is maintained and stable and clear printing is performed.

Note that the printing plate is not limited to one using a screen, but may also be one using a metal mask, and in the case of this metal mask, the convex portions can be integrally formed by etching.

The printing material is not limited to printed circuit boards, and the same applies to other printing materials.

As described above, the present invention is capable of preventing ink bleeding with a simple structure of providing a continuous convex portion on the outlet side edge of an ink passage portion.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional screen printing plate, Fig. 2 is a sectional view of the main part when printing with the same screen printing plate, and Fig. 3 is a main part when printing with the screen printing plate of an embodiment of the present invention. FIG. A... Screen printing version, 1... Gauze,
2...Photosensitive agent, 3...Ink passing section,
5...Printed circuit board, 6...Ink,
7...Squeegee, 8...Protrusion.

Claims (1)

[Claims] A printing plate characterized in that a continuous convex portion is formed on the ink outlet side edge of the ink passage portion of the screen or mask.