Annealing of Polycarbonate Plastic Molded Parts to Improve Plating Coverage
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18
A technique is described whereby polycarbonate plastic molded parts are annealed prior to plating operations so as to reduce or eliminate the problems of skip plating, which may occur in high stress molded parts. Polycarbonate plastic parts are being successfully plated with auto-catalytic or electroless plating, using such metals as copper/ nickel or similar metals, to provide shielding to meet electromagnetic emission requirements. It has been found, however, that the molded plastic parts experience small cracks during preplate treatment in areas of high stress, such as cover louvers and parts with narrow cross-sections. This condition causes plating to be omitted from or adhering to the plastic, called skip plating.