Vacuum-packing method and apparatus

Details Vacuum-packing method and apparatus Vacuum-packing method and apparatus

1977-11-17

1979-08-14

McGehee, Travis S.

Package making

Methods

With contents treating

53441, 53 86, 53512, 53557, B65B 3102

Patent

active

041641116

ABSTRACT:
In a vacuum-sealing method and apparatus for various articles to be packed under vacuum, the improvement consisting in that a hot-air circulating closed-loop path is provided within the vacuum-packaging enclosure, so as to have hot air circulating unidirectionally in order to sweep the package virtually concurrently with the evacuation and autogenous welding stage. A swingable flap valve inserted in the hot-air path upstream of the specially provided heating means ensures such a unidirectional hot air flow. By so doing, the vacuum-packing operations can be more efficiently and quickly completed. The package wrappers are made of a thermoplastics, heat-shrinkable material.

REFERENCES:
patent: 3777446 (1973-12-01), Graver
patent: 3956867 (1976-05-01), Utz et al.
patent: 3958391 (1976-05-01), Kujubu
patent: 3991543 (1976-11-01), Shaw

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