Method for detecting film dissolving amount of developing solution

Abstract

The invention provides a method for detecting film dissolving amount of a developing solution. The method comprises the following steps: step 1, preparing a developing solution, so that the developing solution is alkaline; step 2, taking dry films in a preset amount, dissolving the dry films in the developing solution in the step 1, and stirring uniformly, so that the film dissolving amount of the developing solution reaches a preset value; step 3, taking a sample solution of a preset volume from the developing solution stirred to be uniform in the step 2; step 4, preparing acids in a preset amount; step 5, mixing the sample solution in the step 3 with the acids in the step 4 in a measuring cup; step 6, stably lowering the liquid level in the measuring cup in the preset time, so that the dry films dissolved in the developing solution float on the liquid level of the developing solution; step 7, reading the scale range which corresponds to the dry films floating in the step 6; and step 8, calculating to obtain the film dissolving amount of the developing solution according to a ratio of the scale range read in the step 7 to the scale range of the liquid level in the measuring cup. According to the method disclosed by the invention, unnecessary waste caused by blind tank replacement and overflow increase can be avoided.

Description

technical field [0001] The invention relates to the field of PCB board manufacturing, in particular to a method for detecting the dissolved film amount of a developing solution. Background technique [0002] The developer is the main liquid used for the transfer of circuit graphics, and it is responsible for the graphic analysis link. After the circuit imaging of the PCB board is made, the dry film or ink on the board surface is divided into two areas, ① the polymerized area we need and ② the unpolymerized area we don’t need. Unnecessary unpolymerized areas need to be removed with a developer, which has achieved the purpose of circuit analysis. [0003] After cleaning, the unpolymerized dry film dissolves in the developer solution, and the proportion of the dry film dissolved in the developer solution gradually increases. When the solution exceeds the standard of 2.5ft per L of liquid medicine, there will be quality problems. The industry is very clear about the film disso...

AI Technical Summary

Problems solved by technology

[0006] 1. There is no reasonable way to detect the proportion of dissolved film in the developer, resulting in blind management

[0007] 2. The consumption of water resources is large, and the cost of environmental protection treatment increases

[0008] 3. There is no reasonable guarantee of production quality