Shrinkage in molded parts is a complex behavior that involves the polymer material, part design, tool design, and molding process set-up. In Part 6 of the warpage lessons, we will focus on how filled and unfilled polymer materials affect shrinkage and warpage behaviors.
Topics covered in this lesson include: how to use a simple polymer flow front temperature test to compare material heat energy behaviors inside a cavity; how different injection pressure requirements will result in different packing pressure profile set-ups and affect shrinkage and warpage behaviors; that temperature ranges and distributions inside cavities are different for different materials and will influence shrinkage and warpage behaviors; and how unfilled and glass filled polymers impact shrinkage and part warpage.