Printed-circuit board manufacturing process with part printed with carbon oil

Abstract

The invention discloses a printed-circuit board manufacturing process with a part printed with carbon oil. The manufacturing process includes the following steps of manufacturing a carbon oil layer, wherein a carbon oil position wherein a carbon oil layer needs to be manufactured is arranged on the surface of a circuit board, the carbon oil position is printed with carbon oil in a screen mode, and then the circuit board is baked to cure the carbon oil; manufacturing a protective layer, wherein the protective layer is arranged on the surface of the carbon oil layer and the surfaces of lines and a bonding pad needing to be protected in a screen print mode; silver depositing, wherein a silver layer is uniformly deposited on the surface of the board; removing the protective layer. The silver is deposited after carbon oil screen printing, circuit board baking and protective layer manufacturing, the problem that the silver surface becomes yellow as the board is baked after silver depositing is solved, the protective layer is manufactured on the carbon oil layer and the surfaces of the lines and graphs needing to be protected so that silver can be prevented from being deposited on the carbon oil layer and the surface of the part of the circuit board which does not need silver depositing, and the carbon oil layer is effectively and partially protected against discoloration. The obtained circuit board carbon oil does not discolor or deposit silver, the deposited silver face does not become yellow or discolor, the quality of the circuit board is improved, and the reject ratio is reduced.

Description

technical field [0001] The invention belongs to the technical field of printed circuit board production, and in particular relates to a printed circuit board production process for partially printing carbon oil. Background technique [0002] Printed Circuit Board (PCB for short), also known as printed circuit board, is an important electronic component, which serves as a support for electronic components and a carrier for electrical connections of electronic components. [0003] The production process of traditional printed circuit boards generally includes the following processes: material cutting→pressing→drilling→copper sinking→full board electroplating→outer layer circuit graphics production→graphic electroplating→alkaline etching→silk printing solder mask→characters→testing →Forming→Immersion Silver→Quality Inspection→Packaging. Among them, the immersion silver process is the last surface treatment process in the manufacture of printed circuit boards. The main purpose ...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is that the existing printed circuit board manufacturing process cannot guarantee the quality of immersion silver and silk-screen carbon oil at the same time, and problems such as yellowing of the silver surface, discoloration of the carbon oil, and silver sinking on the surface of the carbon oil are prone to occur. , so as to propose a printed circuit board manufacturing process that takes into account that carbon oil does not change color and does not apply silver, and that the silver surface of immersion silver does not turn yellow and does not change color.