Process for coating sheet substrates with thermoplastic polymer

Details Process for coating sheet substrates with thermoplastic polymer Process for coating sheet substrates with thermoplastic polymer

B - Operations, Transporting

32

B

117/114.6

B32B 21/08 (2006.01) B05D 1/26 (2006.01) B29C 47/12 (2006.01) B29C 47/88 (2006.01)

Patent

CA 1068177

ABSTRACT OF THE DISCLOSURE An improved process for coating sheet substrates with thermoplastic polymer is disclosed. In the process the sheet substrate forms one die lip of the extrusion coating die. The sheet substrate is passed from face-to-face contact with the metal block of the extrusion coating die into a spaced apart relationship with one die lip of the extrusion coating die, that sheet substrate forming the second die lip. Molten thermoplastic polymer is extruded into the space be- tween the one die lip and the sheet substrate, thereby coating the sheet substrate with polymer. The preferred polymer is a poly-.alpha.-olefin, especially polyethylene or a copolymer of ethylene and butene-1. The preferred sheet substrate has orifices in the surfaces thereof. The process may be used to coat sheet substrates with a thermoplastic polymer, e.g. in the manufacture of form boards for the construction industry.

267074

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