Spiral distributor, blowing head, blown film plant, process for producing a blown film and blown film

摘要

Film extrusion systems use spiral distributors to produce a melt that is as homogeneous as possible during operation. The spiral distributors are usually available as cylindrical or conical axial spiral distributors or as radial spiral distributors. The spiral distributors have spiral channels. These run in a multiple spiral arrangement in such a way that very flat horizontal edges form precisely in the beginning sections and vertical edges form between the beginning of spiral channels and transition sections of adjacent spiral channels. The melt can easily adhere there. The invention proposes to provide accelerators for the melt in critical areas. For this purpose, the invention provides, for example, to modify the course or the cross section of the channels or the surface.