Shrink wrapping process and apparatus

Details Shrink wrapping process and apparatus Shrink wrapping process and apparatus

1977-09-27

1979-03-20

Spruill, Robert Louis

Package making

Methods

Conforming by stretching or shrinking of cover over contents

53557, B65B 5302

Patent

active

041446968

ABSTRACT:
In a process and apparatus for forming a multi-layer protective envelope around an object that is generally prismatic or cylindric in shape the object while being rotated about a stationary, horizontal axis is wrapped-around with a web of thin, heat-shrinkable and heat-softenable plastic film having a width that exceeds the length of the object, successive portions of said web after having arrived at the periphery of the object and as the object rotates being exposed to a heating radiation while passing a zone extending along the full length of the object and also inwardly over portions of the end surfaces thereof. Layer after layer of said film will thereby shrink to tightly surround the object, including at least the radially outer marginal portions of the ends thereof, and also laminate together into a tough unitary casing.

REFERENCES:
patent: 3624654 (1971-12-01), Hoffler et al.
patent: 3863425 (1975-02-01), Edwards et al.
patent: 3875723 (1975-04-01), Sundin
patent: 4051643 (1977-10-01), Saito

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