Package making – Methods – With contents treating
Patent
1983-05-26
1985-11-05
Spruill, Robert L.
Package making
Methods
With contents treating
53442, 53512, 53557, B65B 3100, B65B 5132, B65B 5306
Patent
active
045505489
ABSTRACT:
A method for vacuum shrink packaging a product is provided that includes the steps of placing the product in a heat shrinkable thermoplastic bag; then shrinking the bag in a heated gaseous medium, while partially constricting the mouth of the bag to cause ballooning of the bag, further provided that the constricting is selected such that shrinkage of the bag overcomes the ballooning to collapse the bag onto the product; and then placing the bag in a vacuum chamber followed by vacuumizing and in-chamber sealing, further provided that the rate of vacuumizing is limited to substantially prevent reballooning of the bag. Associated apparatus for carrying out the method is also provided.
REFERENCES:
patent: 3668817 (1972-06-01), Bell
patent: 3699742 (1972-10-01), Giraudi
patent: 3958391 (1976-05-01), Kujubu
patent: 3965646 (1976-06-01), Hawkins
patent: 3983258 (1976-09-01), Weaver
patent: 4164111 (1979-08-01), Di Bernardo
patent: 4457122 (1984-07-01), Atkins et al.
Dobbins Frederick A.
Owensby Joseph E.
Rupp Jody W.
Waldrop Thomas E.
Lee, Jr. William D.
Mudd Richard M.
Quatt Mark B.
Spruill Robert L.
Toney John J.
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