Electric heating – Metal heating – Of cylinders
Patent
1988-07-11
1989-08-01
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1053, 1563802, H05B 640
Patent
active
048535109
ABSTRACT:
This relates to an induction heating coil which is of a single turn construction and particularly configurated for inducing electrical energy into a metal foil barrier layer of a laminated container closure for effecting heat bonding of the closure to a container in a preselected seal pattern. The seal pattern contains either one corner or the closure is provided with a projecting pull tab wherein there is a greater heating requirement and thus a requirement for the induction of higher electrical energy into the closure. The need for the induction of a greater amount of heat into the closure at a corner or the location of a projecting pull tab is provided for by reducing the cross section of the heating coil at the location of the greater heat requirement. The reduction in cross section is primarily effected by forming a notch in the heating coil. If desired, a closer control of the heating effect of the coil may be obtained by positioning in the notch a ferrite insert.
REFERENCES:
patent: 2459971 (1949-01-01), Stanton
patent: 2474703 (1949-06-01), Story
patent: 3303314 (1967-02-01), Kuhlbars
patent: 3548140 (1970-12-01), O'Neill
patent: 3727022 (1973-04-01), Hamilton
patent: 3737613 (1973-06-01), Gillock
patent: 3748422 (1973-07-01), Schafer
patent: 3766353 (1973-10-01), Barbieux
patent: 3846609 (1974-11-01), Enk
patent: 4757175 (1988-07-01), Mohr et al.
Mohr Glenn R.
Roth Donald J.
Brown Charles A.
Brown Charles E.
Continental Can Company Inc.
Leung Philip H.
Shapiro Paul
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