Die swell occurs when an extrudate has larger diameter than the die. It is caused by the release of stresses in the extrudate leaving a contraction – the extrudate ‘remembers’ it’s original shape and attempts to return to it. Die swell can result in an extrudate with several times the diameter of the die, depending on the process and conditions.



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Polymer Industries – Tim’s Top Tips Explanation & Evaluation of Die Swell 737kb Download

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