Method for sealing plastic-metal laminates

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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53 39, 93DIG1, 100 93P, 100281, 100272, 156182, 156583, 156306, 426398, B29C 2700

Patent

active

040973182

ABSTRACT:
A sealing apparatus for joining container parts of a plastic-lightweight metal foil laminate by heat and pressure applied to the laminates when the respective plastic layers are pressed into contact uses a toggle linkage and a yieldable buffer, with a hydraulic actuator to drive the toggle linkage to close a pair of sealing heads together. The toggle linkage permits build-up of pressure to a value predetermined by the construction of the buffer, after which the buffer yields to hold the sealing pressure. The duration of the build-up to sealing pressure comprises no more than 20% of the time interval between initiation of pressure build-up and the start of pressure drop-off at the end of the sealing process.

REFERENCES:
patent: 905601 (1908-12-01), Sperber
patent: 2310556 (1943-02-01), Strong
patent: 2344114 (1944-03-01), Seogwick
patent: 2369362 (1945-02-01), Martiani
patent: 2412924 (1946-12-01), Stover
patent: 3000429 (1961-09-01), Warnken
patent: 3103701 (1963-09-01), Calchers et al.
patent: 3177106 (1965-04-01), Seerluth et al.
patent: 3657055 (1972-04-01), Nichols
patent: 3817801 (1974-06-01), Widmer

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