Pretensioner for stretchable film web with dancer roller compens

Details Pretensioner for stretchable film web with dancer roller compens Pretensioner for stretchable film web with dancer roller compens

1981-03-31

1984-07-10

Levy, Stuart S.

Package making

Methods

Applying a partial cover

53441, 53556, 53587, 242 754, 242 7551, B65B 1104, B65D 4100, B65N 1900

Patent

active

044584679

ABSTRACT:
A tensioner assembly pre-stretches a film web prior to unitizing a pallet load. The film web undergoes three stages of stretching by the tensioner assembly which includes two driven rollers and a resiliently biased dancer roller. The dancer roller engages the film and maintains it under continuous tension loading as the pallet load rotates. An electrical control signal proportional to the angular position of the dancer roller is employed by a control circuit to vary the rotational speed of the pretensioner drive rollers. The film web is stretched in a first stage between a feedstock roll and the first drive roller. A second stage of stretching occurs between the first driven roller and the second driven roller. Finally, the film web undergoes a third stage of stretching between the second driven roller and the pallet load, with the web being maintained under tension at all times by the resiliently biased dancer roller.

REFERENCES:
patent: 2914893 (1959-12-01), Berst
patent: 3079056 (1963-02-01), Grozhewegen
patent: 3539085 (1970-11-01), Anderson et al.
patent: 3595495 (1971-07-01), Cloeren
patent: 3829038 (1974-08-01), Studer
patent: 3850379 (1974-11-01), Stern
patent: 4012003 (1977-03-01), Cochran
patent: 4166589 (1979-09-01), Hoover
patent: 4302920 (1981-12-01), Lancaster et al.

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