Package making – Apparatus for contraction of cover by stretching or shrinking
Patent
1978-01-23
1979-12-18
Sipos, John
Package making
Apparatus for contraction of cover by stretching or shrinking
53226, 53228, B65B 1118
Patent
active
041787404
ABSTRACT:
A machine for stretch wrapping articles, such as trays of produce, poultry, meat and the like, has a wrapper feeding mechanism which positions measured lengths of stretchable wrapping material between an elevator mechanism and a folding mechanism which is located above the elevator mechanism and includes a plurality of relatively movable folding plates. Clamping mechanism releasably secures opposite marginal portions of the positioned wrapping material while the elevator mechanism raises an article to be wrapped into stretching engagement with the wrapping material, held by the clamping mechanism, and pushes the article up through an opening of adjustable size defined by parts of the wrapper feeding mechanism and the folding mechanism to stretch the wrapping material tightly over the article. Portions of the taut wrapping material are then folded under the article by the folding mechanism. A remaining portion of the wrapping material is folded under the article as the article is moved by an overhead conveyor across a stationary folding plate to a heat sealing station where the folded under portions of the wrapper are sealed against the bottom of the wrapped package.
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patent: 2808693 (1957-10-01), Guggenheim
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patent: 3237372 (1966-03-01), Hartman
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patent: 3327453 (1967-06-01), Willbrandt
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patent: 3967433 (1976-07-01), Bonfiglioli
patent: 3977158 (1976-08-01), Jennings
patent: 4035985 (1977-07-01), Aoyama et al.
patent: 4078363 (1978-03-01), Panzi
Groom James S.
Prince Clarence F.
Package Machinery Company
Sipos John
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