Importance

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Abstract

A process is provided for making a composite work article suitable for fabricating rigid sheet metal can components. A steel sheet having first and second surfaces is pre-treated to enhance reception and retention of a multi-layer polymer coating on the pre-treated first surface. The multi-layer polymer coating is melt extruded on the pre-treated first surface and beyond opposite lateral edges of the work article to establish overhang portions, then solidified. The multi-layer polymeric coating has a tie polymeric layer contacting the pre-treated first surface, and a finish-surface polymeric layer. The solidified overhang portions are trimmed, and the extruded multi-layer polymeric coating is subjected to finish-treatment, involving heating the extruded multi-layer polymeric coating at least to a melt temperature thereof, then cooling the multi-layer polymeric coating through glass-transition temperature thereof at a sufficiently rapid rate to establish amorphous non-directional characteristics in the polymeric coating.

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First Claim