Electric heating – Metal heating – Of cylinders
Patent
1980-03-12
1982-08-17
Reynolds, B. A.
Electric heating
Metal heating
Of cylinders
426107, 229 35MF, 229 43, 99451, H05B 664
Patent
active
043451330
ABSTRACT:
A carton is disclosed having a paperboard receptacle and a cover fitting over the same; the cover being adapted to shield the top and sides of food material within the receptacle from microwave radiation, but allowing radiation to be admitted through the unshielded bottom of the receptacle. A surface of the cover is formed of a conducting metal which substantially inhibits the passage of microwave radiation therethrough. The depending cover wall which surrounds the side edges of the receptacle is constructed such that adjacent portions of the panels forming the cover wall are provided with a low impedance electrical connection at microwave frequencies to inhibit arcing between such panels during heating. The cover may be formed from a unitary, flat paperboard blank, in which case all corners of the various cover wall panels which will be in proximity to the surface on which the carton is supported during heating are rounded to minimize the electric field intensity created at these corners--thus reducing the likelihood that arcing will occur between various portions of the cover, or between the cover and the surface on which the carton is supported.
REFERENCES:
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patent: 3353968 (1967-11-01), Krajewski
patent: 3865301 (1975-02-01), Pothier et al.
patent: 3935415 (1976-01-01), Moore
patent: 4015085 (1977-03-01), Woods
patent: 4133996 (1979-01-01), Fread
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patent: 4196331 (1980-04-01), Leveckis et al.
patent: 4204105 (1980-05-01), Leveckis et al.
Cherney Jerome A.
Pawlowski Thomas D.
American Can Company
Auber Robert P.
Bowie Stuart S.
Leung Philip H.
Reynolds B. A.
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