Apparatus for heating sheet-like thermoplastic preshapes

Details Apparatus for heating sheet-like thermoplastic preshapes Apparatus for heating sheet-like thermoplastic preshapes

1981-02-20

1982-12-28

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219216, F27B 906

Patent

active

043663699

ABSTRACT:
In an apparatus for heating preshapes consisting of a thermoplastic, in particular a fiber-reinforced plastic, the preshape is fed, by a conveyor belt, to a heating apparatus equipped with bright infra-red radiators. To provide time-dependent metering of the thermal energy, the installation possesses an electronic control unit, equipped with a microprocessor, which unit generates a periodically increasing and decreasing electrical signal voltage, whose time-curve and amplitude can be varied in accordance with the heat uptake capacity of the preshape. The signal voltage additionally controls a feed unit, which in turn feeds to the heating apparatus, by means of a phase control system, a periodic electric current which in its time-curve and amplitude corresponds to the pre-programmed signal voltage.

REFERENCES:
patent: 3980863 (1976-09-01), Wulz et al.
patent: 4180721 (1979-12-01), Watanabe et al.

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