Carbon oil printing process for circuit board

Abstract

The invention discloses a carbon oil printing process for a circuit board. The process comprises the following steps of 1, cleaning the board surface of the circuit board; 2, pasting a water film; 3, coating photosensitive glue; 4, exposing; 5, developing; 6, drying. The board surface of the circuit board is coated with a layer of water film with the thickness of 35 [mu]m, and the photosensitive glue is coated on the obverse side and the reverse side before a screen printing plate is exposed, so that the screen printing plate is more uniform and neater, and in addition, the thickness of the screen printing plate is increased, so that the screen printing plate is more stable in shape during printing and is not easy to deform, and the reliability is improved; the printing thickness of carbon oil is increased, so that the problems of short circuit and open circuit at places with high use frequency can be effectively prevented; the thickness of the water film is adjusted from the original 25 [mu]m to 35 [mu]m, and the thickness of the film is increased, so that carbon oil is prevented from being diffused and leaked, the manufacturing yield of the carbon oil is effectively improved, the quality of a PCB (printed circuit board) is improved, the appearance of the board surface is more attractive, scrap of circuit boards is reduced, and the manufacturing cost of the carbon oil is reduced.

Description

technical field [0001] The invention relates to the technical field of circuit board manufacturing, in particular to a carbon oil printing process for circuit boards. Background technique [0002] With the rapid development of the electronics industry, carbon oil printed boards are gradually being used in common electrical appliances and instruments that tend to be multi-functional and miniaturized, such as: TVs, telephones, electronic organs, game consoles, video recorders, etc., its new Technology and new functions are constantly being developed and utilized. Microcomputers, micro-recorders, electronic measuring instruments and SMT electronic fields have also begun to use carbon film printed boards, such as buttons in the printed circuit on the surface of the PCB of electronic appliances. , often need to be contacted but not fixed together. In the process of carbon oil circuit board production, the current process is to directly screen-print carbon oil on the cured photos...

AI Technical Summary

Problems solved by technology

In the process of carbon oil circuit board production, the current process is to directly screen-print carbon oil on the cured photosensitive ink. Due to the strong fluidity of the photosensitive ink and uneven thickness, it is easy to produce tiny cracks after curing, and the carbon oil penetrates through these cracks. On the circuit under the photosensitive ink, resulting in a micro-short circuit and scrapping

At the same time, carbon oil, as a semiconductor, is mostly used on the button positions of low-voltage products. Because of its high frequency of use, it is prone to short circuit and open circuit problems.