Double belt plastic sheet forming and take-off system

Details Double belt plastic sheet forming and take-off system Double belt plastic sheet forming and take-off system

B - Operations, Transporting

29

D

18/1026

B29D 7/14 (1980.01)

Patent

CA 1036775

DOUBLE BELT PLASTIC SHEET FORMING AND TAKE OFF SYSTEM Abstract of the Disclosure An apparatus utilizing paired endless belts is provided as a low pressure die or sheet forming device and take-off system for forming extruded polymer melts into thermoplastic sheet; said sheet possessing isotropic characteristics, improved dimensional stability, and improved surface characteristics. A method is also provided that includes: taking up a strand of extruded polymer melt between endless moving belts; maintaining the region of contact between the melt and said belts at a temperature that allows the melt to adhere to the belts; forming the melt strand into a web of the desired dimensions by compressing, spreading and flattening between said belts; gradient cooling the thermoplastic web between the belts under conditions to provide isotropic properties to the finished thermoplastic sheets before their separation from said belts.

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