Patent ID: 8430727

Claim:
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, for regions of the tubular film ( 1 ) left free by the flattening elements, lateral guide elements ( 2 ) situated between the flattening elements, associated with the tubular film ( 1 ), and having an adjustable contour, wherein the lateral guide elements ( 2 ) comprise a support structure equipped with adjusting mechanism, at least one support arm ( 25 ) is fastened to the support structure, the at least one support arm ( 25 ) supports guides ( 27 ) for the tubular film ( 1 ), and the support structure has a plurality of support legs ( 20 , 21 , 22 ) connected to one another in articulating fashion and adjustable by adjusting drive units ( 28 , 28 a ).