Package making – Methods – Applying a partial cover
Patent
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.
Hicks Cecil L.
Shulman Michael H.
White Kenneth D.
Doigan Lloyd D.
Glaser Kenneth R.
Infra Pak (Dallas), Inc.
Levy Stuart S.
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