Bilateral etching of printed circuit boards - in spray chamber with revolving spider for bilaterally leaning circuit boards

摘要

A device for the bilateral etching of boards, specially of copper masked boards during the manufacture of PCB's is a container with one vertical shaft carrying a spider to support one to six boards on radial arms. A ring above the spider has the same number of loop-shaped retainers in which the boards can rest with a bilateral inclination. A second vertical shaft drives a revolving spray tube which also draws in the etchant from a chamber below the spray chambers. The mounting of the PCB's now causes no differences in the etching intensity and both sides of the board have the same uniform etching rate.