High dielectric constant material to shape electric fields for h

Details High dielectric constant material to shape electric fields for h High dielectric constant material to shape electric fields for h

1991-08-09

1992-03-31

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1075, 264 26, 4251748E, H05B 654

Patent

active

051010852

ABSTRACT:
Apparatus for heating a plastic sheet uses a high dielectric constant material (HDCM) to shape an RF electric field to be either concentrated or uniform as desired depending upon the object to be formed from the sheet. Electrodes can be annular with a circular or elliptical cross-section or be plates or wires, and can be disposed in the HDCM or exterior of the HDCM. A process for heating a plastic material comprises generating an RF field and shaping the field near the material using high dielectric constant members.

REFERENCES:
patent: 1934704 (1933-11-01), Golden
patent: 2407833 (1946-09-01), Jablonsky
patent: 2421101 (1947-05-01), Lakso
patent: 2565161 (1951-08-01), Wilmotte et al.
patent: 2609482 (1952-09-01), Young
patent: 2708703 (1955-05-01), Cunningham et al.
patent: 2856497 (1958-10-01), Rudenberg
patent: 2866063 (1958-12-01), Rudd
patent: 4640280 (1987-02-01), Sterzer

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