Etching method of thick copper circuit board

Abstract

The invention provides an etching method of a thick-copper circuit board. The etching method of the thick-copper circuit board comprises film stripping, first etching, overturn, postback, second etching and other steps. Compared with correlation technologies, the etching method of the thick-copper circuit board can effectively reduce a two-face etching line width difference, and the etching method of the thick-copper circuit board is low in cost.

Description

technical field [0001] The invention relates to the technical field of circuit board processing, in particular to an etching method for a thick copper circuit board. Background technique [0002] The thickness of the copper layer covering both sides of the printed circuit board is usually HOZ (half ounce, half ounce, 1OZ=28.35g) or 1OZ (ounce, ounce). With the rapid development of electronic technology, thick copper (the thickness of the copper layer is more than 2OZ ) The demand for circuit boards has increased sharply. Thick copper circuit boards play an important role in high-current substrates and have the following advantages: [0003] 1. It can transfer the heat generated by the components to the outside of the substrate, so it can realize the purpose of high-density interconnection of high-power electrical appliances; [0004] 2. In the application fields of automobiles, power supplies, electric power and electronics, thick copper foil high-current substrates are use...

AI Technical Summary

Problems solved by technology

[0009] 1. The difference in line width between the upper and lower boards during etching is mainly caused by the pool effect of the upper and lower boards. This effect cannot be completely eliminated by adjusting the etching spray pressure on the upper and lower sides of the etching cylinder. The difference in line width between the upper and lower boards after etching It still exists, especially for thick copper circuit boards;

[0010] 2. Frequent adjustment of the pressure of the etching cylinder will affect the quality and production efficiency of other boards, and affect the production capacity and output of the entire etching production line

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