Patent ID: 8286904
Filing Date: 2012-10-16
Classification: B65H

Abstract:
1. A method for winding up and removing one or a plurality of coreless rolls of a stretchable plastic film on a mandrel comprising a tubular body having a peripheral wall provided with a plurality of perforations or holes, in which said wall extends longitudinally from a rear to a fore end of the mandrel, and means for supplying pressurized air in the tubular body of the mandrel and out through the holes during removal of the roll or rolls, wherein at least one roll or a plurality of rolls of the stretchable plastic film are wound up on said perforated zones of the mandrel, comprising the steps of: providing the tubular body of the mandrel with at least a first fore air chamber and a second rear air chamber, axially aligned, at respective fore and rear perforated zones of the peripheral wall of the mandrel; connecting the air chambers of the mandrel to a pressurized air source by a duct system comprising selectively actuable control valves; removing the roll or the plurality of rolls, by initially supplying pressurized air in all the air chambers of the mandrel during a first removal step of the roll or rolls; and subsequently selectively disconnecting each single air chamber from the pressurized air source during a second removal step of the roll or rolls, starting from the rear air chamber (