Electric heating – Metal heating – Of cylinders
Patent
1989-10-30
1991-02-19
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1073, 219 1079, 1562724, 1563802, H05B 640
Patent
active
049946374
ABSTRACT:
A single turn induction coil which provides uniform sealing of lids to plastic containers. A first end of the coil overlaps a second end of the coil with the ends being tapered to form a single complete ring. An electrical current is coupled to the overlapped portions of the first and second end of the coil so the electrical current flows for more than 360.degree. around the coil. This provides an induced electrical current around a container lid adjacent to the coil and provides heating of the complete circumference of the lid. A variety of shapes of containers and matching lids can be used with the present invention.
REFERENCES:
patent: 2515874 (1950-07-01), Hoyler et al.
patent: 3808074 (1974-04-01), Smith et al.
patent: 4571472 (1986-02-01), Pollack et al.
patent: 4749837 (1988-06-01), von Ammon et al.
patent: 4757175 (1988-07-01), Mohr et al.
patent: 4833287 (1989-05-01), Abe et al.
Fang Jin-Liou
Rough J. Kirkwood H.
FMC Corporation
Guernsey Lloyd B.
Kamp R. C.
Leung Philip H.
Megley R. B.
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