Forming wiring pattern on acrylic! glass plate - by printing waterproof adhesive on copper foil bonded to carrier with soluble adhesive, etching and transfer

摘要

In the application of electric wiring patterns to acrylic glass plates, esp. floodlight plates, a Cu foil is bonded to a stainless steel or plastics carrier plate with a water-soluble adhesive. An activatable, etching-resistant and waterproof synthetic rubber-based adhesive is screen printed on this Cu foil in the required pattern and, after the adhesive has dried, the unprinted Cu foil is etched away from the carrier plate. The wiring pattern is then transferred to the acrylic glass plate by activating the second adhesive with a solvent or by direct or capacitive heating and the whole is placed in water to dissolve the water-soluble adhesive, until the substrate plate can be lifted off. Di-ficulties of obtaining the required adhesion encountered in relatively costly electroplating processes are avoided.