Patent ID: 6045866
Filing Date: 2000-04-04
Classification: C23C,H05K

Abstract:
A method of forming electroless metal plating layers on one single surface of a plastic substrate having a first contact surface and a second contact surface, said method comprising:a. degreasing or pre-etching a material for forming said plastic substrate;b. etching said substrate having been degreased or pre-etched to produce an etched substrate;c. adding a catalyst;d. activating said etched substrate to form an activated substrate;e. accelerating;f. forming an electroless copper plating layer on a second contact surface of said substrate;g. activating said substrate again;h. forming an electroless nickel plating layer on said copper plating layer of said substrate;i. sealing said plated substrate to form a sealed substrate;j. dehydrating said sealed substrate;k. drying said substrate again;l. inspecting said substrate; andm. packing said plastic substrate;wherein said method is characterized in that additional steps are incorporated between the above step d and step e, said additional steps comprising drying said activated substrate, spraying non-conducting paint over a first contact surface of said substrate, and drying said substrate again, whereby said electroless copper and nickel plating layers formed on said second contact surface of said substrate serve to prevent electromagnet wave interference while said non-conducting paint on said first contact surface of said substrate prevents said second contact surface of said substrate from being plated.