Heat treating thermoplastics sheet materials for thermo-forming

Details Heat treating thermoplastics sheet materials for thermo-forming Heat treating thermoplastics sheet materials for thermo-forming

B - Operations, Transporting

29

C

18/1077

B29C 51/42 (2006.01) B29B 13/02 (2006.01) B29C 35/06 (2006.01) B29C 35/04 (2006.01)

Patent

CA 1290910

ABSTRACT HEAT TREATING THERMOPLASTICS SHEET MATERIALS FOR THERMOFORMING An apparatus for, and a method of, heating a thermoplastic material in web form in readiness for forming three-dimensional objects therefrom in a thermo-forming process involves (a) advancing the web material intermittently through a heating zone on a belt conveyor without imposing thereon any mechanical stress-inducing physical constraints (such as may be applied by material gripping means), and (b) sweeping the web material with a series of hot air jets which are spaced apart in the direction movement of the material, which extend transversely across the width of the material, and which are reciprocated in that direction in a manner such as to ensure a uniform heating of the web material passing out of the heating zone to a thermo-forming apparatus.

512086

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