Package making – Methods – Wrapping contents including cover forming
Patent
1990-12-19
1992-06-23
Coan, James F.
Package making
Methods
Wrapping contents including cover forming
53218, 53441, 53504, 53588, B65B 1102
Patent
active
051232308
ABSTRACT:
A method of wrapping articles in plastic, whereby the cross-section of the article dictates variations in the length of plastic web required at various times, with a mechanical wrapper that revolves around the article and has at least one take-off cylinder rotating at a rate controlled in accordance with a sequence of values that depends on the article's cross-section, and releasing plastic in the length required at a particular time. The sequence of values exploited for controlling the take-off cylinder (7) is determined during at least the first revolution of the winder (5) by measuring the stress on the web downstream of the take-off cylinder in the accordance with the angle (.PHI.) of the winder, is stored in a memory (15), and is appropriately standardized for varying the rate of rotation of the take-off cylinder. The device for carrying out the method has a tension sensor (9 & 10) that rests against the web (3) downstream of the take-off cylinder (7) and employs signal converters to determine the tension occurring as the take-off cylinder rotates in the form of a sequence of values depending on the angle .PHI. of rotation.
REFERENCES:
patent: 4722170 (1988-02-01), Ball et al.
patent: 4862678 (1989-09-01), Humphrey
patent: 4936080 (1990-06-01), Haloila
patent: 4953336 (1990-09-01), Lancaster, III et al.
patent: 5005335 (1991-04-01), Yourgalite et al.
B. Hagemann Gmbh & Co.
Coan James F.
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