Method and apparatus for the thermal treatment of thermoplastic

Details Method and apparatus for the thermal treatment of thermoplastic Method and apparatus for the thermal treatment of thermoplastic

1993-04-02

1994-06-21

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 37, 264 406, 264535, 425526, 4251744, 432 10, 432 21, 432 42, B29C 3508

Patent

active

053226518

ABSTRACT:
Preforms are thermally treated in a continuous-run oven equipped with infrared lamps. The portions of the oven exposed to infrared radiation are cooled by an air flow, whose temperature is kept constant by mixing air at ambient temperature with hot air. The latter is obtained by recycling at least part of the cooling air flow, which becomes heated as it carries away excess heat. A recycling mechanism in the form of a plenum box 13 equipped with a pivotable shutter 16 for adjusting the proportions of recycled hot air and ambient temperature air makes it possible to keep the temperature of the cooling air constant.

REFERENCES:
patent: 4050887 (1977-09-01), Berggren et al.
patent: 4076071 (1978-02-01), Rosenkranz et al.
patent: 4079104 (1978-03-01), Dickson et al.
patent: 4117050 (1978-09-01), Appel et al.
patent: 4234297 (1980-11-01), Kontz
patent: 4300880 (1981-11-01), Suzuki
patent: 4606723 (1986-08-01), Pasternicki
patent: 5066222 (1991-11-01), Roos et al.

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