Using Secondary Air Cooling in Blown Film Extrusion: Concept Design and Experimental Study

The characteristics and the quality of a blown film are strongly influenced by the stretching and simultaneous cooling of the molten polymer within the bubble formation zone. Moreover, the output rate of the process is generally limited by the cooling rates and the stability of the bubble. As a consequence, the design of cooling systems is highly relevant in terms of process optimization. Beside intensifying the heat removal, the concept of secondary air cooling aims at eliminating unsteady ambient influences during bubble formation and increasing bubble stability. Different concepts for cooling systems with integrated secondary air cooling are presented and experimentally tested. The results confirm that the implementation of secondary air cooling is feasible and generally supports bubble cooling regarding the aforementioned intention. Furthermore, the study reveals that an accurate design of such cooling systems is required.


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