Electric heating – Capacitive dielectric heating – With workpiece support
Patent
1994-08-23
1995-05-30
Leung, Philip H.
Electric heating
Capacitive dielectric heating
With workpiece support
219772, 219779, 219780, 264 26, 4251748E, 34250, H05B 660, H05B 650
Patent
active
054204046
ABSTRACT:
An apparatus and method for drying, by heating, a continuous supply of dielectric material. A terminated, quarter-wavelength transmission line is used as a "traveling wave" applicator for transferring electromagnetic energy from a radio-frequency generator to the dielectric material as the material passes through the transmission line, preferably by gravity feed. The transmission line applicator is directly connected to the output of the radio-frequency generator, without any intervening feeding transmission line, so that the transmission line applicator becomes the resonant output tank circuit of the generator and thus determines the oscillation frequency of the generator. Forced air may be blown through the dielectric material as it flows through the transmission line so as to sweep moisture, driven to the surface of the dielectric material by heating, from the flowing dielectric material. The temperature of the flowing dielectric material may be monitored, and control circuitry accordingly adjusts the power output of the radio-frequency generator so as to maintain the temperature within a desired range. The flow of the dielectric material from the transmission line applicator may be metered so as to achieve a required residence time of the dielectric material within the transmission line for proper drying.
REFERENCES:
patent: 2436999 (1948-03-01), McMillan et al.
patent: 2483623 (1949-10-01), Clayton
patent: 2504969 (1950-04-01), Ellsworth
patent: 3041435 (1962-06-01), Cameron
patent: 3125656 (1964-03-01), Spash et al.
patent: 3721920 (1973-03-01), Mann
patent: 3971693 (1976-07-01), Pederson
patent: 4104804 (1978-08-01), Sargeant
patent: 4147488 (1979-04-01), Chiron
patent: 4254253 (1981-03-01), Brent, Jr. et al.
patent: 4392804 (1983-07-01), Pushee et al.
patent: 4396816 (1983-08-01), Krishnakumar et al.
patent: 4531038 (1985-07-01), Lillibridge et al.
patent: 4546226 (1985-10-01), Trembley et al.
patent: 4567340 (1986-01-01), Latchum, Jr.
patent: 4629851 (1986-12-01), Holle
patent: 4792573 (1988-12-01), Cohn
patent: 5145694 (1992-09-01), Brams
patent: 5250773 (1993-10-01), Lind et al.
patent: 5266762 (1993-11-01), Hoffman et al.
George R. Lightsey & Lynn D. Russell, Mississippi State Univ., Low Temperature Processing of Plastics Utilizing Microwave Heating Techniques (1985).
John D. Gaspari, Microwave/RF Resin Drying: More Than Hot Air?, Plastics Technology 66-73 (Oct. 1989).
Goodman Wendell G.
Vulpe Alex
Leung Philip H.
W. G. Goodman and Associates, Inc.
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