Mechanism and Solution of Defects in Injection Molding

   The injection molding process is a complex process involving mold design, mold manufacturing, raw material characteristics and raw material pre-treatment methods, molding process, injection molding machine operation, and other factors that are closely related to processing environmental conditions, product cooling time, and post-processing processes. Manufacturing processes. Therefore, the good quality of the product is not only determined by the injection molding accuracy and measurement accuracy of the injection molding machine, or only by the quality of the mold design and the accuracy level of the mold processing. Generally, it is also affected by the other factors mentioned above and Constraints.

  Under the constraints of so many composite factors, the emergence of defects in injection molded products is inevitable. Therefore, the internal mechanism of defect generation and the location and type of defects that may be predicted by the product are sought, and used to guide mold design and improvement and to summarize defects The resulting rules and the formulation of more reasonable process operating conditions are particularly important. We will elaborate the mechanism and solution of injection molding defects from the three main factors that affect the plastic material characteristics, mold structure, injection molding process, and injection equipment in the injection molding process.

  Classification of common defects of injection molded products

  There are various plastic raw materials used in the injection molding process, and the types and forms of mold design are also varied. In addition, the operator's familiarity with a particular injection molding machine, the operating skills between workers, and the practical experience vary. At the same time, the objective environment (such as ambient temperature, humidity, and air cleanliness) will also vary with the seasons. These objective and subjective conditions jointly determine the occurrence of defects in injection molded products.

  Generally speaking, the evaluation of the performance of plastic products mainly has three aspects:

  , Appearance quality, including integrity, color, gloss;

  Second, the relationship between size and relative position, that is, dimensional accuracy and position accuracy;

  Third, the mechanical properties, chemical properties, electrical properties, etc. corresponding to the use, that is, functionality

  Therefore, if a problem occurs due to any of the above three aspects, it will lead to the production and expansion of product defects.