Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1993-01-28
1994-08-23
Coan, James F.
Package making
Progressively seamed cover web or web folds
With closing of web between package units
53548, 53450, B65B 906
Patent
active
053396090
ABSTRACT:
Due to variations in the thickness of the film used in wrapping packaged product and various other reasons, the wrapping film such as polyethylene, polypropylene, etc., occasionally causes uneven pulling on the film with resultant turning around or twisting of the film on the packaged product, which causes a breakdown in the wrapping operation. Such breakdowns are avoided by placing on each side of the film wrapping apparatus, a film tracking, preferably electrostatic, probe appropriately spaced from the film so as to position an electrostatic charge thereon. If the film tries to creep sideways, one side of the film is exposed much more to the static generating cone on that side and less on the other. The resultant static friction forces built up on one side of the film and less on the opposite side cause the film to creep towards the side with less static friction build up until the static forces on both sides become equal and cure or avoid the twisting procedure.
REFERENCES:
patent: 4295322 (1981-10-01), Kuipers
patent: 4419855 (1983-12-01), Shanklin
patent: 4433527 (1984-02-01), Ramsey et al.
patent: 4589247 (1986-05-01), Tsuruta et al.
patent: 4872302 (1989-10-01), van Eijsden et al.
patent: 4945709 (1990-08-01), Cerf
patent: 4947605 (1990-08-01), Ramsey
Coan James F.
Monacelli Walter J.
Polycerf Inc.
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