The Science of Shear: How to Prevent Material Degradation in Twin Extruders
Shear is one of the most important yet misunderstood factors in PVC extrusion. While proper shear helps melt, mix, and homogenize material, excessive shear can cause thermal degradation, discoloration, poor pipe quality, and increased rejection rates. This guide explains how shear works inside a twin extruder and how manufacturers can prevent material degradation while maintaining high production efficiency.









