Packaging process and apparatus

Details Packaging process and apparatus Packaging process and apparatus

1981-06-16

1984-09-18

Coan, James F.

Package making

Methods

With contents treating

53512, B65B 3102

Patent

active

044715994

ABSTRACT:
A vacuumizing and sealing operation on a package comprises initially reducing the external pressure on the package, before sealing of the package, to a value at which the flexible film covering of the package is capable of ballooning, and ensuring heating of the flexible film of the package, preferably while an intermediate pressure is maintained (at which intermediate pressure ballooning could just be sustained without excessive evacuation to reduce the thermal capacity of the circulating air). Finally the pressure inside and outside is reduced still further before re-pressurizing.

REFERENCES:
patent: 3688463 (1972-09-01), Titchenal
patent: 3693314 (1972-09-01), Reid et al.
patent: 3851437 (1974-12-01), Waldrop et al.
patent: 3956867 (1976-05-01), Utz et al.
patent: 3958391 (1976-05-01), Kujubu
patent: 4112124 (1978-09-01), Jarvis
patent: 4164111 (1979-08-01), DiBernardo
patent: 4223513 (1980-09-01), Mahaffy et al.

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