Automatic control system of PH value in alkaline etching and control method thereof

Abstract

The invention discloses a control system of PH value in alkaline etching, relating to a control system of alkaline etching of a printed-circuit board and a control method. The invention aims to solve the problems that the PH value is difficult to control in the alkaline etching and the efficiency is low. The adopted technical scheme is as follows: the automatic control system of PH value in alkaline etching comprises an automatic control system, an etchant addition tank, a specific gravity controller, an ammonia chloride addition tank, and an ammonia water addition tank, wherein the automatic control system is used for controlling the operation of the whole system, the etchant addition tank is used for adding etchant into an etching section, the specific gravity controller is used for detecting and displaying the specific gravity of the solution in the etching section and transmitting the result to the automatic control system, the ammonia chloride addition tank is connected with the etching section and is used for adding the ammonia chloride solution in the etching section, and the ammonia water addition tank is connected with the etching section and is used for adding the ammonia water solution in the etching section. The invention is mainly used for alkaline etching link to adjust the PH value in the producing process of the printed-circuit board.

Description

technical field [0001] The invention relates to an alkaline etching control system and a control method for a printed circuit board, in particular to an automatic control system and a control method for pH value control in alkaline etching. technical background [0002] Printed circuit board, referred to as PCB, as a basic component of the electronic information industry, has developed with the rapid development of the electronic information industry in recent years. Alkaline etching, as the basic process of PCB outer layer circuit formation, the principle and control of process parameters are very mature, as follows: main equipment: film stripping machine, etching machine, lead / tin stripping machine consists of three parts to form a linkage line. The process flow and principle are as follows: Loading machine→removing film→alkaline etching→removing lead / tin→loading machine. [0003] ①Removal of the film: The copper on the unplated part of the substrate after pattern electro...

AI Technical Summary

Problems solved by technology

[0023] The purpose of the present invention is to solve the problem that the pH value is difficult to control and the efficiency is too low in alkaline etching, and to provide an automatic pH value control system for alkaline etching and its control method. The present invention can achieve rapid, automatic and accurate control of the pH value , and reduce the discharge of ammonia water, which is environmentally friendly, safe and reliable, and the operation is very convenient

Images