Carbon oil printing process of circuit board

Abstract

The invention discloses a carbon oil printing process of a circuit board. The process comprises the following steps of firstly manufacturing a horizontal carbon oil film and a vertical carbon oil film; respectively applying the horizontal carbon oil film and the vertical carbon oil film to a silk screen for manufacturing a horizontal carbon oil silk screen and a vertical carbon oil silk screen; firstly mounting the horizontal carbon oil silk screen on a screen printer, after the horizontal carbon oil silk screen is aligned with a to-be-printed circuit board, performing silk printing of a horizontal carbon oil pattern on the to-be-printed circuit board, wherein the direction of the horizontal carbon oil pattern is same with a glue scraping direction; performing first baking on the circuit board for semi-curing the horizontal carbon oil pattern; then mounting a vertical carbon oil silk screen on the screen printer, and after alignment, performing silk printing of a vertical carbon oil pattern on the to-be-printed circuit board, wherein the direction of the vertical carbon oil pattern is same with the glue scraping direction; and performing second baking on the circuit board for curing the horizontal carbon oil pattern and the vertical carbon oil pattern. According to the process of the invention, through separated silk printing of the horizontal carbon oil pattern and the vertical carbon oil pattern, quality problems such as carbon oil open-circuit or carbon oil accumulation short-circuit are settled.

Description

technical field [0001] The invention relates to the technical field of printed circuit board production, in particular to a carbon oil printing process for a circuit board. Background technique [0002] Printing carbon oil is to print the conductive carbon oil on the surface of the circuit board under a certain force through the screen pattern, and after high temperature baking, the carbon oil pattern is fixed on the surface of the PCB to form a carbon with a certain resistance value. The film replaces the original resistance element and has good electrical conductivity. [0003] For the situation that the carbon oil patterns on the surface of the PCB are 90° to each other and the distance between the carbon oil patterns is <0.45mm, when only one set of carbon oil film is used for printing, it is easy to have quality problems such as carbon oil open circuit or carbon oil accumulation short circuit. ;The carbon oil pattern perpendicular to the screen printing direction is...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the situation that the carbon oil patterns on the surface of the circuit board are 90° to each other and the distance between the carbon oil patterns is less than 0.45mm. When only one set of carbon oil film is used for printing, carbon oil open circuit or carbon oil accumulation oil short circuit is easy to occur and other quality problems, a carbon oil printing process for circuit boards is provided. This method solves quality problems such as carbon oil open circuit or carbon oil accumulation oil short circuit by separating horizontal carbon oil graphics and vertical carbon oil graphics.