APPARATUS FOR SPIRALLY CUTTING PLASTIC FOIL TUBES

摘要

An apparatus for opening a flattened tube of thermoplastic comprises a pair of drawing rolls for a flat tube which are mounted in a machine frame and a device for cylindrically opening a section of the continuously drawn-forward tube. In order to open the tube cylindrically without any creases or folds, supporting plates are arranged in a wedge-shaped manner in the frame, symmetrically to the centre plane of the roll nip of the pair of drawing rolls and converge towards the roll nip. On a carrying plate (70) or the like there is fastened a blowing-air tube, which preferably extends beyond sliding rods of a supporting mandrel (15) which enclose the said tube and which is connected to a blower arranged on the carrying plate.