Arrangement for the sealing of thermoplastic-coated packing mate

Details Arrangement for the sealing of thermoplastic-coated packing mate Arrangement for the sealing of thermoplastic-coated packing mate

1980-10-22

1983-02-01

Reynolds, B. A.

Electric heating

Metal heating

Of cylinders

219 1057, 219 1077, 219 1079, 1563796, H05B 644, H05B 614

Patent

active

043717683

ABSTRACT:
The windings of an electromagnetic device for heat-sealing thermoplastic material having an electrically conductive layer are included as an inductive component in an oscillatory circuit, rather than merely being an external load. Two inductively coupled windings operate as a feedback element to control the alternate conduction of two transistors, to produce an oscillating signal. The core of the electromagnetic heating element has a E-shaped cross section, and the windings are wound around the middle limb of the core and are substantially surrounded by the two outer limbs to thereby substantially reduce thermal losses.

REFERENCES:
patent: 1912214 (1933-05-01), Northrup
patent: 2293851 (1942-08-01), Rogers
patent: 2490081 (1949-12-01), Mittelmann
patent: 3300614 (1967-01-01), Sorensen
patent: 3704357 (1972-11-01), Moulin
patent: 3727982 (1973-04-01), Itoh et al.
patent: 4104498 (1978-08-01), Gerber
patent: 4122321 (1978-10-01), Cachat

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