Self sealing vacuumed package

Details Self sealing vacuumed package Self sealing vacuumed package

1983-03-29

1985-08-13

Husar, Francis S.

Package making

Methods

With contents treating

426410, 426413, 426130, 426486, B65B 3100

Patent

active

045341524

ABSTRACT:
Packaging of certain products like cheese is usually done in a vacuum without the presence of heat. Heretofore, a first vacuum was necessary to knit the curds together and to compact the cheese. A second vacuum was then employed to remove air which returned to the package. The present method eliminates the need for the second vacuum. A heat sealable package, containing cheese, and having a tortuous vent passage is subjected to a vacuum. As a full vacuum is achieved, air within the chamber and the package is exhausted. When the chamber is returned to atmospheric pressure, the tortuous seal collapses to form a temporary seal. At the same time, the plastic bag collapses around the cheese which causes the curds to knit together, and compact the cheese. While still in the sealed condition, a permanent heat seal is made across the tortuous vent passage.

REFERENCES:
patent: 3108881 (1963-10-01), Shaw et al.
patent: 3140185 (1964-07-01), Pinckney
patent: 3216832 (1965-11-01), King
patent: 3261140 (1966-07-01), Long et al.
patent: 3545983 (1970-12-01), Woods
patent: 3869842 (1975-03-01), Verbeke

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