METHOD FOR PRODUCING METALLIZED ARTICLES FROM POLYAMIDE STRIP IN VACUUM Russian patent published in 1995 - IPC

FIELD: metallization. SUBSTANCE: metallized polyamide film may be up to 250 mm wide and up to 1000 mm long. Its quality ensures the continuity of applied metal coat while its adhesion to polyamide film stays intact after five bend-overs at 180 deg with a bending radius of 50 microns. The chemically-treated polyamide film is placed on the external side of a metal drum installed in a vacuum chamber. The film is stretched on the drum with a force of 0,005-0,01 kg/mm². After evacuation of the vacuum chamber the drum with the polyamide film is heated for 20-30 min at 260-270 C. Then the drum is set in rotation and metal is applied to polyamide film by a magnetron method. The drum temperature during metallization is maintained at 270-300 C. The magnetron spraying method is divided into two stages. First, a layer of metal (30-50) A thick is applied thus forming a tightly-packed crystalline structure. Then a metal with polycrystalline structure is built-up to the desired thickness of layer. EFFECT: one or both surfaces of polyamide film can be metallized with practically any metal or alloy to thickness of up to ten microns. 3 dwg, 5 tbl