Heat treating thermoplastic sheet materials for thermo-forming

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

1986-06-20

1987-08-18

Hart, Charles

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264522, 425383, 425526, B29C 1703

Patent

active

046876120

ABSTRACT:
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.

REFERENCES:
patent: 3907480 (1975-09-01), Renoux
patent: 3917770 (1975-11-01), Jackson

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