How To Reduce Plastic Parts Waste

New cross-sectional shape of runner system in Plastic Injection Parts(Xinghui). The new geometry reduces scrap and cycle time, and also makes it easier to eject the runner system from the mold.

New cross-sectional shape of runner system in Plastic Injection Parts(Xinghui). The new geometry reduces scrap and cycle time, and also makes it easier to eject the runner system from the mold. Xinghui analyzed short shot defects of plastic parts during the injection process to verify the newly proposed geometry. For two circular flat plates with a thickness of 1 mm, elliptical runner systems with different cross-section ratios are proposed. Select the filling time, melt temperature, mold temperature, dwell time and pure cooling time as the input of the injection machine. The contribution of this research lies in the design of the new geometry of the cold runner system to reduce waste and cycle time, and to make ejection of the runner system easier during injection molding. The results of these studies indicate that the new geometry is free of short-shot defects. In addition, it also showed a significant reduction in warpage and cooling time. Compared to circular cross sections, waste and cooling time are reduced by 25% and 2.5%, respectively. The reduced contact surface between the runner system and the mold wall also makes it easier to eject the runner system from the cavity.

Ningbo Xingguang Machinery Technology Co., Ltd. was established in 2006 and is located in the port city of Ningbo, Zhejiang. We are a professional manufacturer of stamping, welding, injection molding, SMC, BMC molding, assembly. Our products are widely used in telecommunications, elevators, automobiles, construction machinery, electrical appliances and other fields. The company covers an area of ​​7,000 square meters and a building area of ​​6,500 square meters. It has a high-quality management team, including 12 production management personnel, 5 technical personnel, and 6 quality control personnel. We warmly welcome friends from all walks of life to visit and cooperate.


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