| 摘要 |
Method steps and apparatus combinations for continuous in-line polymeric coating of rigid corrosion-protected flat-rolled sheet metal continuous-strip substrate utilizing a thermoplastic polymeric material having adhesive characteristics, capable of molten thin-film extrusion for chemical-bonding with an activated-surface of the flat-rolled sheet metal substrate, and substantially-simultaneously bonding with a solid-film polymeric material; establishing multiple-polymer-layers traveling with said activated surface; said solid polymeric film being selected to provide strength, hardness and other desired surface mechanical properties; and, also, providing for external surface coloration, design, weather-proofing, and fabricating capabilities; a second embodiment provides dual-surface multiple-polymeric layer coating carried on by activating and polymeric coating one surface at a time of rigid corrosion-protected flat-rolled sheet metal continuous strip substrate.
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