Microwave heating device and method

Electric heating – Metal heating – Of cylinders

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219 1055M, 426243, 426107, 99451, 252 6256, H05B 664

Patent

active

042661080

ABSTRACT:
A microwave heating device is comprised of a microwave reflective member having positioned adjacent thereto magnetic microwave absorbing material. The absorbing material, by being magnetic, will heat by coupling of the magnetic component of microwave radiation. The thickness of the absorbing material is such that at the Curie temperature the material will reflect at least about 65% of the incident microwave radiation. The absorbing material has a volume resistivity value R, at room temperature, in ohm cm of greater than about the value where Log R=(Tc/100)+2 where Tc is the Curie temperature (.degree.C.) of the material. By the proper combination of thickness, high resistivity and Curie temperature, the device is temperature self-limiting in a microwave field and can be used to heat objects in contact with the device to predetermined temperatures in spite of wide fluctuations in microwave power or power uniformity.

REFERENCES:
patent: 2830162 (1958-04-01), Copson et al.
patent: 3573207 (1971-03-01), Deschamps
patent: 3773669 (1973-11-01), Yamauchi et al.
patent: 3941967 (1976-03-01), Sumi et al.
patent: 4116906 (1978-09-01), Ishino et al.
Microwave Heating, 2nd edition, Avi Publishing Company, 1975, by D. A. Copson, chapter 12, pp. 286-302.
Agricultural and Food Chemistry, vol. 3, No. 5, May 1955, p. 424, "Browning Methods in Microwave Cooking", by D. A. Copson et al.

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