Device for producing blown films
OwnerJens Spirgatis, Andreas Böhminventors
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Abstract
A device for producing blown films, including an extrusion device generating a tubular film and a flattening device, associated with the tubular film, having two flattening elements, arranged on diametrically opposite zones of the tubular film and adjustable in relation to each other at an acute angle, for transforming the cross-section of the tubular film, which is first circular, then oval, to a double-layer film web. The device further includes a pair of draw-off rolls, mounted downstream of the flattening device, for drawing off the film web. This invention has guide blades that are interposed between the flattening elements and enclose the edge fold which is formed when the tubular film is flattened.
Claims8
A device for producing blown films, comprising an extrusion device that produces a tubular film (1) and having a flattening device associated with the tubular film (1) that has two flattening elements situated in diametrically opposite regions of the tubular film and that are adjustable at an acute angle in relation to each other so that an initially circular cross section of the tubular film is transformed, passing through oval cross sections, into a double-layered film web, and having a pair of draw-off rollers situated after the flattening device for drawing off the tubular film, between the flattening elements guide blades (27a) enclose respective edge folds of the tubular film (1) which form during flattening of the tubular film (1), and guide the edge folds into the nip between the draw-off rollers.
Dependencies are inferred from the claim text.