Optimisation of Production Output and Film Quality from Blown Film Extrusion Systems, 2007 PLACE Conference

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In our quest to increase production capability we generally tend to concentrate our efforts to increase the most influential parameter of extrusion throughput to achieve our production goals. In blown film extrusion systems we tend to give significant attention to the influence of cooling systems in our quest for higher throughput levels. However, while this is an important factor in the blown film process it must be remembered that this is one component in what should be regarded largely as a sequential process. In this situation subsequent processes are dependent on the optimization of the preceding element. One interesting function in the blown film process is the functionality of the collapsing geometry employed to form a flat tube. This is one element that can influence both upstream and down stream conditions. It has also been recognized that film winders are often at the mercy of upstream conditions. It is the intention of this paper to highlight key elements of a blown film extrusion system and process that can have a significant effect on the opportunity to maximize the output, efficiency and film quality.