Pretensioner for stretchable film web with dancer roller...

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

B - Operations, Transporting

65

B

156/58

B65B 11/00 (2006.01) B65B 11/04 (2006.01) B65B 27/00 (2006.01)

Patent

CA 1185163

"PRETENSIONER FOR STRETCHABLE FILM WEB WITH DANCER ROLLER COMPENSATION" ABSTRACT OF THE DISCLOSURE A tensioner assembly pre-stretches a film web prior to unitizing a pallet load. The film web undergoes three stages of stretch- ing 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.

391547

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