Patent ID: 6623797
Filing Date: 2003-09-23
Classification: B05C,B05D,B32B

Abstract:
A process for coating a metal strip with a polymer, comprising the steps of:heating a metal strip having a thickness between approximately 0.015 and 0.006 inch to a temperature between about 250-500Â° F.; positioning a surface of the metal strip with a pair of rolls below an extrusion coating head configured to extrude a thin molten polymeric film, the outlet of the extrusion coating bend positioned ahead of the roll nip between the pair of rolls; extruding the thin molten polymeric film onto the surface of the metal strip with the extrusion coating head ahead of the roll nip; subsequently drawing the thin molten polymeric film to a thickness of less than about 0.0001 to about 0.00003 inch on the surface of the metal strip in the roll nip; postheating the coated metal strip to a temperature between about 392-500Â° F.; and quenching the coated metal strip to a temperature between about 104-150Â° F.