Apparatus for deforming thermoplastic material using RF heating

Details Apparatus for deforming thermoplastic material using RF heating Apparatus for deforming thermoplastic material using RF heating

1990-12-18

1992-01-21

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Electro-static or inductive field

264 26, 264327, 264DIG46, 425DIG13, B29C 3512

Patent

active

050824368

ABSTRACT:
A dielectric mold member has different thicknesses producing different radio frequency (RF) voltage drops thereacross. An RF electrode is spaced differently from a thermoplastic sheet to be dielectrically heated by the RF energy such that in one implementation the sheet receives uniform potentials and is heated uniformly. In other implementations, the sheet can receive selectively controlled heating over different regions. In an alternative embodiment, multiple pairs of electrodes apply different RF field levels to different portions of the thermoplastic sheet to compensate for the different voltage drops due to different mold thicknesses or to applied different controlled heating levels to different regions.

REFERENCES:
patent: 2423902 (1947-07-01), Peterson
patent: 3289253 (1966-12-01), Buonaiuto
patent: 3444275 (1969-05-01), Willett
patent: 3937774 (1976-02-01), Wiley et al.
patent: 4134942 (1979-01-01), Mirr et al.
patent: 4179252 (1979-12-01), Seufert
patent: 4196158 (1980-04-01), Ward
patent: 4423191 (1983-12-01), Haven et al.
patent: 4824617 (1989-04-01), Takeuchi et al.
patent: 4851167 (1989-07-01), Marc
patent: 4921646 (1990-05-01), Stewart
patent: 4921647 (1990-05-01), Stewart
patent: 4937021 (1990-06-01), Danforth et al.
patent: 4943224 (1990-07-01), Nied et al.

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