Claims
- 1. An apparatus for the production of a thermoplastically moldable polymeric resin article of a predetermined shape, by shaping the resin while in a thermoplastic state and which comprises; a mold having
- (i) mold walls including an interior molding surface defining the predetermined shape; and
- (ii) means associated with the mold walls for controlling the thermoplasticity of the resin being shaped;
- the improvement, which comprises;
- as the means for controlling the thermoplasticity of the resin being shaped, a thin-film resistance heater disposed on the molding surface.
- 2. The improved apparatus of claim 1 wherein there is temperature control means associated with the means for thermoplasticity.
- 3. The improved apparatus of claim 2 wherein the temperature control means comprises a thermistor mounted on the mold surface.
- 4. The improved apparatus of claim 1 wherein a plurality of thin-film resistance heaters operates in separate zones of molding surface.
- 5. The improved apparatus of claim 1 which further comprises means for cooling the resin in the mold.
- 6. The improved apparatus of claim 1 wherein the mold is selected from the group consisting of an injection mold, compression mold, thermoforming mold, blow mold and rotational mold.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of our copending U.S. patent application Ser. No. 028,647 filed on Mar. 20, 1987, now U.S. Pat. No. 4,897,028.
US Referenced Citations (8)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
28647 |
Mar 1987 |
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