RF heated mold for thermoplastic materials

Details RF heated mold for thermoplastic materials RF heated mold for thermoplastic materials

1992-01-31

1994-11-01

Bushey, Charles S.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Temperature control

249 78, 264 25, 264 406, 264327, 425170, 4251744, 4253781, 425384, B29C 6502

Patent

active

053603303

ABSTRACT:
A source of radio frequency energy is applied to a low thermal inertia heating element with high thermal conductivity, such as a spool, for rapidly heating the heating element to settable predetermined temperature, which temperature is maintained essentially constant. The heating element is detachably attached about the die of a mold for transferring heat to the die to form, mold, weld or extrude thermoplastic material placed within the mold. Thermal chokes restrict heat transfer from the die to the remainder of the mold. One or more heat sinks draws and dissipates heat from the thermal chokes to maintain cool zones of the mold. Following the heating cycle, upon termination of application of radio frequency energy to the spool, cooling may be accelerated by directing a stream of gas upon the heating element.

REFERENCES:
patent: 2814070 (1957-11-01), Bulkley et al.
patent: 2832879 (1958-04-01), Van Riper
patent: 2904839 (1959-09-01), Beckwith
patent: 3068513 (1962-12-01), Chaffin
patent: 3843300 (1974-10-01), McFarlane
patent: 4055219 (1977-10-01), Orlandi et al.
patent: 4253011 (1981-02-01), Hinz
patent: 4661300 (1987-04-01), Daugherty
patent: 5047605 (1991-09-01), Ogden
patent: 5102324 (1992-04-01), Bullard et al.
patent: 5160396 (1992-11-01), Jensen et al.

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