Technique for partially joining copper foils and separator sheets

Abstract

This technique involves joining copper foils of any type and thickness to aluminum sheets of any alloy and thickness in order to simplify the assembly of multilayer press books, whereby two copper foils of any type and thickness and one aluminum sheet of any alloy and thickness are joined in such a way that the joint is located outside the surface of the aluminum separator. At the same time, the registration slots required for the multilayer press can be punched. The selected copper foil panels.are slightly larger than the aluminum sheet. When the aluminum separators thus covered with a copper foil on both sides are subsequently placed into the press together with the epoxy resin fabrics (prepregs) for laminating the multi-layer, the aluminum sheet can expand unhindered during heating without causing any surface tension on the copper foils. As soon as the epoxy resin liquefies, surplus resin can run off along the projecting edges of the oversize copper foil without coming into contact with the aluminum sheet and without contaminating the edges of the press books. The projecting copper foil with the surplus resin can then easily be cut off along the edges of the aluminum separator.

Dependencies are inferred from the claim text.