Electric heating – Metal heating – Of cylinders
Patent
1988-11-17
1990-10-23
Envall, Jr., Roy N.
Electric heating
Metal heating
Of cylinders
219 1055F, 99DIG14, H05B 680
Patent
active
049654233
ABSTRACT:
Disclosed are improved ceramic compositions which are useful in the formulation of microwave susceptors and to the susceptor articles fabricated therefrom for disposable packages for the microwave heating of food items. The compositions include a novel microwave absorbing material and a binder. The novel microwave absorbing materials comprise selected ceramics in both their native and amphoteric forms. Such ceramics are those with residual lattice charges or an unbalance of charge in the fundamental framework or layers such as vermiculite, bentonite, hectorite, selected micas including Glauconite, Phlogopite and Biotite and mixtures thereof. These ceramics are activated to their amphoteric form by treatment with either acids or bases. The compositions provide good heat generation and a predeterminable upper temperature limit which is higher in the amphoteric form than in their native form. The ceramic materials are common and inexpensive. Preferred compositions additionally include a temperature profile moderator which can be common salt.
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Envall Jr. Roy N.
General Mills Inc.
O'Toole John A.
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