Web perforating apparatus

Details Web perforating apparatus Web perforating apparatus

B - Operations, Transporting

26

F

164/114

B26F 1/20 (2006.01) B26D 7/14 (2006.01)

Patent

CA 1294536

WEB PERFORATING APPARATUS ABSTRACT OF THE DISCLOSURE As a conditioning step for wrapping a plurality of articles in a low density polyethylene shrink film, perforations are formed in the shrink film for receiving machine elements utilized in performing the wrapping operation, the film being moved continuously between a pair of infeed rolls and a pair of outfeed rolls between which a rotatable mandrel is disposed and which includes perforating knives thereon for engaging the film while the film is moved continuously, the perforating knives being disposed on the opposite side of the web from a rotatable back up roll having cavities formed therein for receiving the ends of the perforating knives in such manner that the web is maintained under tension throughout the perforating process while the backup roll serves to prevent sidewise movement of the web due to web perforating action of the perforating knives.

540133

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