Methods and apparatus for surface preparation and dual polymeric layer coating of continuous-strip flat-rolled sheet metal, and coated product
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United States of America Patent
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Nov 18, 2008
Grant Date -
Nov 14, 2002
app pub date -
May 28, 2002
filing date -
Jan 24, 2000
priority date (Note) -
Expired
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Abstract
Processes and apparatus for manufacturing an engineered-composite combining rigid flat-rolled sheet metal continuous-strip and selected polypropylene thermoplastics, which are formulated into dual polymeric coating layers for extrusion deposition, as distinct layers, on a single surface at a time, of continuous-strip, traveling in-line at ambient temperature. Steps for forming a uniform thickness of polymeric layers across strip width, and attraction to an activated metallic surface which provides enhanced adhesion. Solidification of the polymeric layers is augmented by strip temperature during continuous-in-line travel; final dual-surface finishing provides for complete bonding of the polymeric layers on both metallic surfaces.
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