• The cause of shrinkage of injection molded parts and how to solve them

    I believe that many mold manufacturers have encountered a plastic defect-shrinkage on injection molded parts. Few processors really know how to solve the shrinkage issue technically.In most case, mold makers just increase injection pressure,use longer injection time,or open larger injection gate, only annoyed to find that the issue is still there. Among the commonly used raw materials, the shrinkage problem of modified PC and PP are the most difficult to handle due to fast cooling rate. Through 20 years, we have made plenty of plastic components with different kinds of resins for our global customers and has mastered some unconventional molding techniques to improve the shrinkage problem on plastic molded parts with thick wall. Basically, the plastic shrinkage defect could be contributed to 3 aspects, molding machine, plastic mold, and plastic material. Injection molding machine Cause:1: The injection pressure in the cavity is too low.2: Insufficient plastic in the cavity.3:…

    Injection molding process October 28, 2019


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