Process for adding drug sterilizing in water washing procedure at mfg. printed circuit board

Abstract

The invention relates to a sterilizing method in water washing course in making printed circuit board (PCB), a method of adding drug for sterilizing in water washing course in making PCB, and its characteristic: selecting a production line, in water washing course, adding disinfectant in each water washing tank, and the method of adding the disinfectant: adding the disinfectant in each water washing tank every 4 hours, and according to the flow of each water washing tank, the addition of the disinfectant (ml / 4h)= flow X (50-300) / 1000000; recording the addition and adding time for 1 week to collect bad proportions; simultaneously, randomly taking a PCB out of the PCBs produced on this production line to make confidence test, so as to detect if the product quality is abnormal; comparing the bad proportions in condition of not adding the disinfectant with those in condition of adding the disinfectant to confirm the effect; if the effect is confirmed good and the quality is not abnormal, starting normal adding. It adopts on-line mode of adding drug for sterilizing, no-repelling reaction, simple and obvious-effect. The on-line sterilizing method can effectively killing bacteria in the water washing tanks, and the proportion of copper residues is reduced obviously, thus increasing yield of production.

Description

technical field [0001] The invention belongs to the field of printed circuit board manufacturing, and in particular relates to a method for sterilization of printed circuit boards in the washing process Background technique [0002] Washing is an indispensable link in the production process of printed circuit boards (PCBs). During the washing process, the water system will breed bacteria, which will pollute the water body after multiplying and produce a large amount of mucus. Once this filamentous mucus is attached to the circuit board A large number of unqualified products (such as filamentous copper slag, etc.) will be produced during electroplating or other processes. Existing printed circuit board (PCB) factory wet process washing water sterilization generally adopts ultraviolet sterilization, and ultraviolet light is used to achieve sterilization. The purpose is to install ultraviolet lamps on the washing tank. Although it can solve some problems and alleviate the situa...

AI Technical Summary

Problems solved by technology

[0002] Washing is an indispensable link in the production process of printed circuit boards (PCBs). During the washing process, the water system will breed bacteria, which will pollute the water body after multiplying in large numbers and produce a large amount of mucus. Once this filamentous mucus is attached to the circuit board A large number of unqualified products (such as filamentous copper slag, etc.) will be produced during electroplating or other processes. Existing printed circuit board (PCB) factory wet process washing water sterilization generally adopts ultraviolet sterilization, and ultraviolet rays are used to achieve sterilization. The purpose is to install ultraviolet lamps on the washing tank. Although it can solve some problems and alleviate the situation caused by bacteria, it cannot be effectively killed due to the range and intensity of contact, so the printed circuit board will appear filamentous. Bad phenomena such as copper slag

Images