Package making – Methods – With contents treating
Patent
1992-11-05
1994-10-04
Johnson, Linda B.
Package making
Methods
With contents treating
53479, 53481, 53512, 533706, 533718, B65B 706, B65B 3102, B65B 5114
Patent
active
053514637
ABSTRACT:
The present invention describes a method and apparatus for closing a filled vacuum pack package. The open end of the package, which is made from a thin-wall, flexible foil, is folded above the height of the product in the package. The package is placed in a vacuum chamber, a vacuum is drawn on the contents of the package, and the open end of the packaged is closed airtightly by a closing mechanism. While in the vacuum chamber, the open end of the package, which is not yet completely folded, is folded by a flexible part of the vacuum chamber wall facing the open end of the package. The flexible part of the vacuum chamber is folded inwardly by applying a pressure on its exterior which is greater than the vacuum pressure therein.
REFERENCES:
patent: 2161071 (1939-06-01), McGrath et al.
patent: 2202375 (1940-05-01), Gott
patent: 2859796 (1958-11-01), Taunton
patent: 4457122 (1984-07-01), Atkins et al.
patent: 4583347 (1986-04-01), Nielson
patent: 4706441 (1987-11-01), Chervalier
patent: 4756140 (1988-07-01), Gannon
patent: 5170609 (1992-12-01), Bullock et al.
Johnson Linda B.
Sara Lee / DE N.V.
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