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The mechanism and solution of injection molding defects

Posted by: Fymicohuang 2021-10-07 Comments Off on The mechanism and solution of injection molding defects

The injection molding process is a complex process that involves many factors such as mold design, mold manufacturing, raw material characteristics and raw material pretreatment methods, molding process, injection molding machine operation, etc., and is closely related to processing environmental conditions, product cooling time, and post-processing technology. Manufacturing processes. Therefore, the good quality of the product is not only determined by the injection accuracy and measurement accuracy of the injection molding machine, or is only determined by the pros and cons of the mold design and the accuracy level of the mold processing. Generally, it will also be affected by the other factors mentioned above. Constraints. Under the constraints of so many complex factors, the appearance of defects in injection molded products is inevitable. Therefore, seek the internal mechanism of defects and predict the location and types of defects that may occur in the products, and use them to guide mold design and improvement, and to summarize defects. The generated rules and the formulation of more reasonable process operating conditions are particularly important. We will explain the mechanism and solutions of injection molding defects from three main factors that affect the plastic material characteristics, mold structure, injection molding process and injection equipment during the injection molding process.     Classification of common defects in injection molded products The plastic raw materials used in the injection molding process are diverse, and the types and forms of mold design are also diverse. In addition, the operators’ familiarity with the specific injection molding machine and the operating skills and practical experience of the workers are also different. At the same time, the objective environment (such as ambient temperature, humidity, and air cleanliness) will also vary with seasons. These objective and subjective conditions together determine the occurrence of defects in injection molded products.    Generally speaking, there are three main aspects in evaluating the performance of plastic products:   First, appearance quality, including completeness, color, gloss;    Second, the accuracy between size and relative position, that is, dimensional accuracy and position accuracy;    Third, the mechanical properties, chemical properties, electrical properties, etc. corresponding to the application, that is, functional    Therefore, if there is a problem in any of the above three aspects, it will lead to the production and expansion of product defects.    Classification of common defects in injection molded products    Appearance defect:   Silver pattern discoloration Weld mark Process problem:   Flashing performance issues:    warpage embrittlement 

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