There are many kinds of 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 specific injection molding machine, 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 the seasons. These objective and subjective conditions jointly determine the defects of injection molded products.
Generally speaking, there are three main aspects for evaluating the performance of plastic products:
First, appearance quality, including integrity, color, and gloss;
Second, the accuracy between size and relative position, that is, dimensional accuracy and position accuracy;
Third, mechanical properties, chemical properties, electrical properties, etc. corresponding to the purpose, that is, functionality
Therefore, if there is a problem in any of the above three aspects, it will lead to the generation and expansion of product defects.
Classification of common defects of injection molded products
Appearance defects: silver streaks, discoloration, weld marks
Process problems: flash, shrinkage, lack of glue
Performance problems: warping, embrittlement
