APPLICATION OF TAGUCHI METHOD ON WELDLINE TENSILE STRENGTH OF LONG GLASS FIBER REINFORCED NYLON66 MOLDED PARTS

摘要

Nylon66 composites (PA66 with 40wt% long glass fiber) were used as molding material for injection molded part (tensile specimen with thickness of 1.8mm and 2.5mm). The Taguchi method with L18 orthogonal array was used to determine important factors affecting weldline tensile strength in long glass fiber reinforced Nylon66 molded parts. It was found that the significant contributing factors in the descending order were melt temperature (38.70%), part thickness (28.66%), mold temperature (14.40%), screw speed (10.44%) and filling time (4.27%); moreover, lower melt temperature, part thickness of 1.8 mm, higher mold temperature, higher screw speed and longer filling time would increase the weldline tensile strength for long glass fiber reinforced Nylon66 molded parts with vent design.