A new cross-sectional shape of a runner system in the Plastic Injection Parts (XINGHUI). The new geometry is to reduce the scrap and cycle time and also the easier ejection of runner system from mold tools. Short shot defect in the plastic part during the injection molding process is analyzed by XINGHUI to validate the new proposed geometry. Runner system with elliptical cross-section is proposed with the different ratio for two circular flat plates with a thickness of 1 mm. Filling time, melt temperature, mold temperature, pressure holding time, and pure cooling time are chosen as input for the injection machine. The contribution of this study is the design of new geometry of the cold runner system for a reduction in scrap and cycle time and also easier ejection of the runner system in injection molding. These study outcomes show no short shot defect with the new geometry. Also, it was shown a significant reduction in scarp and cooling time. 25% and 2.5% reduction in scrap and cooling time were achieved compared to the round cross-section, respectively. Reduction in the contact surface of runner system with mold walls improved the easier ejection of runner system out of the cavity as well.

NINGBO STARLITE MACHINERY TECHNOLOGY CO.,LTD. was found in 2006, located in the port city- NINGBO ZHEJIANG. We are a professional manufacturer of stamping, welding, plastic injection and SMC、BMC molding, assembling. Our products are widely used in Telecom, elevator, automobile, construction machinery, electrical appliance and other fields. Our company covers an area of 7000 square and construction area of 6500 spuare,we have a high quality management team including 12 production management staffs, 5 technicaians and 6 QC staffs. We welcome friends for visiting and cooperation.