Packaging machines using retractile thermoplastic film

Details Packaging machines using retractile thermoplastic film Packaging machines using retractile thermoplastic film

1977-07-06

1979-07-31

McGehee, Travis S.

Package making

Apparatus for contraction of cover by stretching or shrinking

By heat shrinking

219243, 219400, B65B 5302

Patent

active

041626044

ABSTRACT:
In a packaging machine assembly using retractile thermoplastic film the improvement comprises the combination of a conventional sealing apparatus and a shrink tunnel to form a single working unit, said tunnel being comprised of a prismatic chamber or compartment having double walls and intermediate thermal insulation and is formed at the end section of the sealing apparatus itself downward in respect to an L-shaped electrical seal and cut resistance means, said chamber or compartment also comprising a grated top surface and provided with an air circulating means, one or more electrical resistances for heating, a hot air flow regulator, and upper laterally-pivoted lid means having transparent walls for airtight contact with the top working surface of the chamber.

REFERENCES:
patent: 3378989 (1968-04-01), Denker
patent: 3399506 (1968-09-01), Howe
patent: 3443356 (1969-05-01), Hani
patent: 4104848 (1978-08-01), Torre

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