How does resin melt strength influence parison stability in WPC blow molding?
Resin melt strength plays a critical role in determining parison stability during Wood-Plastic Composite (WPC) blow molding. A higher melt strength enhances the polymer's ability to resist sagging or stretching under its own weight, ensuring uniform wall thickness and dimensional accuracy in the final product. In WPC blow molding, where wood fibers can disrupt melt homogeneity, optimal melt strength prevents premature parison rupture and improves process control. Factors like polymer composition, molecular weight, and processing temperature directly influence melt strength, impacting extrusion consistency and moldability. Properly balanced melt strength leads to better parison formation, reduced defects, and higher-quality WPC blow-molded products.
