Forming thermoplastic web materials

Details Forming thermoplastic web materials Forming thermoplastic web materials

B - Operations, Transporting

29

C

18/1062, 18/1077

B29C 47/78 (2006.01) B29C 51/02 (2006.01) B29C 51/10 (2006.01) B29C 51/14 (2006.01) B29C 51/18 (2006.01) B29C 51/22 (2006.01) B29C 51/42 (2006.01)

Patent

CA 1304904

ABSTRACT A web of thermoplastic material extruded directly into a set of tempering rolls is cooled on its upper and lower surfaces while the interior of the web is kept molten. The partially cooled web is fed onto a conveyor on which it is fed to a thermoformer. The web remains on the conveyor until its surface layer in contact with the conveyor is reheated to a thermoformable temperature below that at which the web will stick to the conveyor. Apparatus for feeding a web of thermoplastic material from an extrusion to a thermoformer includes tempering rolls and conveyor means which can be adjusted in their relative positions and to control the length of conveyor means contacted by the web.

561760

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