Super-thick carbon oil printing special composite screen printing plate and manufacturing method thereof

Abstract

The invention provides a super-thick carbon oil printing special composite screen printing plate and a manufacturing method thereof. The manufacturing method of the special composite screen printing plate comprises the following steps of (1) fully wetting a composite steel mesh with water; (2) pasting a layer of aqua film to the back surface of the composite steel mesh and baking the composite steel mesh in a drying oven; (3) tearing off an aqua film protective film, coating the surface of the aqua film with light sensitive paste and then drying the aqua film; and (4) conducting exposure and development to obtain the super-thick carbon oil printing special composite screen printing plate comprising the steel mesh, the aqua film layer and the light sensitive paste layer arranged in sequence. Through the screen printing plate, the problem that a short circuit is caused by carbon oil leakage due to the fact that the middle of a mesh screen is empty in the traditional screen printing plateprinting process is solved; the edge of carbon oil is more regular and smooth; deckle edges are avoided in the printing process; the printing quality is guaranteed better.

Description

technical field [0001] The invention relates to the technical field of circuit board production. Background technique [0002] Conductive carbon oil is widely used in the button parts of electronic equipment due to its low resistance, conductivity and wear resistance. In actual production, in order to reduce the resistance value of conductive carbon oil, customers generally have clear requirements on the thickness of carbon oil. The thicker the carbon oil, the smaller the resistance value, but too thick carbon oil can easily cause oil leakage short circuit and uneven carbon oil At the same time, the existing ordinary screen plate has a large expansion and contraction due to the influence of temperature and humidity, and its printing thickness can only reach about 10um. For PCB boards requiring a thickness of 25um, only two printing methods can be used for operation, but two operations are prone to occur Print offset and poor short circuit caused by oil leakage have plagued ...

AI Technical Summary

Problems solved by technology

In actual production, in order to reduce the resistance value of conductive carbon oil, customers generally have clear requirements on the thickness of carbon oil. The thicker the carbon oil, the smaller the resistance value, but too thick carbon oil can easily cause oil leakage short circuit and uneven carbon oil At the same time, the existing ordinary screen plate has a large expansion and contraction due to the influence of temperature and humidity, and its printing thickness can only reach about 10um. For PCB boards requiring a thickness of 25um, only two printing methods can be used for operation, but two operations are prone to occur Poor printing offset and oil seepage short circuit, this problem has plagued those skilled in the art for a long time, and it still cannot be effectively solved at present

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