Electric heating – Metal heating – Of cylinders
Patent
1988-06-03
1989-06-13
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055F, 219 1053, 1563809, 1562744, H05B 680
Patent
active
048394947
ABSTRACT:
A sealing apparatus is described for use with a container having an open end with a sealing rim therearound, a closure on the open end and a membrane in the closure disposed against the sealing rim, the membrane having at least a plastic layer adapted for being sealed to the sealing rim of the container and a layer formed of a high dielectric loss tangent material. Preferably, it includes a resonant cavity having first and second ends, a central axis and an inner peripheral surface located around the central axis, the first end of the resonant cavity having an opening for receiving the open end of the container having the closure thereon. It also includes an applicator electrode extending into the resonant cavity from the second end thereof and having an open end with a sealing rim therearound for supporting the container. The sealing rim includes an outer edge located a predetermined length from the second end of the cavity along an outer peripheral surface of the electrode and located from the inner peripheral surface of the cavity by the predetermined length. A source of electromagnetic energy is connected to the electrode for exciting the cavity with electromagnetic energy at a predetermined frequency to seal the layer to the sealing rim of the container. An effective seal is provided by matching the predetermined length to a substantially quarter wavelength at the selected frequency of the electromagnetic energy in order to obtain a substantially maximized heating effect proximate the desired seal.
REFERENCES:
patent: 2608637 (1952-08-01), Dakin et al.
patent: 3765985 (1973-10-01), Siard et al.
patent: 3928109 (1975-12-01), Pollock et al.
patent: 3999026 (1976-12-01), Boling
patent: 4100386 (1978-07-01), Bardet
patent: 4609417 (1986-09-01), Smith
Judson David H.
Leung Philip H.
Ntronix, Inc.
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