Novel die designs for blown film extrusion involving additive manufacturing
For years, proven concepts such as spiral mandrel dies for blown film extrusion, have been used in extrusion die design. In the case of complex variants, the design also depends on the manufacturability. However, with today's possibilities of additive manufacturing technology, there is potential to optimize this design of the melt-carrying flow channels from a thermo-rheologically point of view. Structures and flow channels that cannot be manufactured conventionally can have a positive influence on the flow behavior. In this paper, a demonstrator tool is presented, which was designed on the basis of numerical flow simulations and manufactured mostly additively. The focus of the design was primarily an improved temperature balance through radial mixing elements.
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