Polymeric coated metal strip and method for producing same

摘要

The present invention is a process for continuous extrusion coating the surfaces of a metal strip which includes the steps of moving said metal strip by means of a plurality of rolls. The strip then has impinged on its first and second surfaces to be coated an oxidizing flame. The first surface passes through a corona discharge and extruded on to the first surface is a melted polymeric extrudiate. Thereafter, the surface is passed over a chill roll having a temperature less than said extrudiate to provide a first coated surface. The second surface is then subjected to a oxidizing flame and corona discharge and a melted polymeric extrudiate is extruded on to the second surface. Thereafter, the second surface is passed over a chill roll having a temperature less than said extrudiate to provide a second coated surface. The coated strip is then reheated to about the melt temperature of said extrudiates and quenched to provide an extrusion coated strip of the present invention.