EXTRUSION PROCESSING GUIDE - Lubrizol
The optimal extruder barrel length for Lubrizol TPUs is 30-32 times its internal diameter (30:1 L/D, 32:1 L/D). Although shorter barrels can be used, mixing efficiency and melt uniformity are not optimal. Cooling to the extruder feed throat is critical to prevent surging or bridging. Internal cooling to the screw is not needed. Screw Design
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