Vacuum packaging method

Details Vacuum packaging method Vacuum packaging method

1985-06-21

1990-05-08

Spruill, Robert L.

Package making

Methods

With contents treating

53512, B65B 3102

Patent

active

049226860

ABSTRACT:
A vacuum packaging process and apparatus employ the novel step of deliberately at least partially re-pressurizing the exterior of a packaging receptacle after commencement of the evacuation of the exterior and interior of the receptacle in a chamber. Preferably two separate gas pressure restoration phases are employed, separated by a resumption of the gas extraction, and the receptacle is closed during the second of these gas pressure restoration phases.

REFERENCES:
patent: 3491504 (1970-01-01), Young
patent: 3714754 (1973-02-01), Holcombe et al.
patent: 3832824 (1974-09-01), Burrell
patent: 3851437 (1974-12-01), Waldrop
patent: 3895475 (1975-07-01), Wolfelsper
patent: 3965646 (1976-06-01), Hawkins
patent: 4132048 (1979-01-01), Day
patent: 4164111 (1979-08-01), Bi Bernardo
patent: 4182095 (1980-01-01), Day
patent: 4457122 (1984-07-01), Atkins et al.

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