Rolling of metallic foil and plastics resin film laminates

In a method of forming a laminate of a plastics resin film and a metallic foil comprising cold rolling said plastics resin film and said metallic foil under pressure sufficiently high to thin both said plastics resin film and said metallic foil the improvement comprising selecting said plastics resin film to have a tensile strength and a percent elongation to provide a degree of rolling equivalent to that of said metallic foil, interposing an adhesive layer between said plastics resin film and said metallic foil thereby forming an adhesive bond between said plastics resin film and said metallic foil to form a unitary structure prior to said cold rolling and cold rolling said unitary structure without breaking said adhesive bond and without relative movement between said plastics resin film and said metallic foil to thereby achieve approximately equal thinning of said plastics resin film and said metallic foil and to thereby maintain structural integrity of said unitary structure after said cold rolling.