The uniformity of the mixture of resin and additives and the apparent density of the mixture will have a greater impact on the impact strength of PVC. PVC processing temperature has a certain range, the temperature is too high, PVC easy to break down; temperature is too low, PVC plasticization is not sufficient, uneven dispersion of various components can also lead to increased brittleness. Host speed reflects the extruder on the role of PVC shear, the speed is too large, increased shear, will reduce the product's low temperature performance and welding angle strength. High molding pressure is conducive to improving the mechanical properties of profiles, especially low-temperature impact strength. Profile molding cooling effect is to stretch the macromolecule chain timely cooling stereotypes, to achieve product requirements. Slow cooling can make the macromolecule chain enough time to stretch, so that the internal stress is small, can reduce the product of warping, bending and contraction, thereby enhancing the impact strength of products and welding angle destructive force.

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