METHOD OF ETCHING APERTURES IN A THIN METAL FOIL

摘要

A method of etching apertures in a thin metal foil. The foil is first covered on both sides with etchant-resistant layers which have the desired pattern of apertures. One of the said layers is covered with a continuous protective layer. First, the side not covered with a protective layer is etched. The protective layer is then removed by means of a solvent, and then the other side is etched. According to the invention, the protective layer consists of a waxy hydrocarbon and the solvent consists of perchloroethylene.