STATUS OF RESEARCH ON DESIGN FOR MECHANICAL RELIABILITY OF INJECTION MOLDED PLASTICS PRODUCTS

摘要

Various injection molded specimens and specimens from injection molded products have been tensile and tensile-impact tested to develop manufacturing-related design guidelines. Tensile strength of PS perpendicular to flow was affected by both filling-induced and packing-induced phenomena. For a nylon block copolymer the influence of test speed was shown. Cold weld line strength in PS was reduced by increased temperatures in the skins during molding. For polyester-amide and PHB the amorphous structure fraction contributed to reduced weld line strength.