Package making – Methods – Forming a cover adjunct or application of a cover adjunct to...
Patent
1978-04-05
1980-01-22
Culver, Horace M.
Package making
Methods
Forming a cover adjunct or application of a cover adjunct to...
53420, 53442, 53488, 53297, 53133, B65B 728, B65B 6118, B67B 304
Patent
active
041843100
ABSTRACT:
A sealed container is formed by positioning a length of heat shrinkable film above the open top of a container, grasping a corner of the film, and heat shrinking the peripheral portion of the film into fluid tight compressive engagement with the upper portion of the container while the film corner is grasped. The unshrunk gripped corner of the film provides a pull tab for removing the closure, when desired. As the peripheral portion of the film is heat shrunk, the remainder of the film is tensioned across the open top of the container, and minute perforations are then formed in the tensioned film to define frangible sections which may be ruptured by a straw when the contents of the container are to be consumed with the closure in place.
REFERENCES:
patent: 3354604 (1967-11-01), Amberg et al.
patent: 3354605 (1967-11-01), Amberg et al.
patent: 3507093 (1970-04-01), Marion
patent: 3590554 (1971-07-01), Carter
patent: 3838550 (1974-10-01), Mueller
patent: 4011119 (1977-03-01), Mitchell et al.
patent: 4035987 (1977-07-01), Nakazato et al.
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