Injection molding process is involved in a variety of factors such as mold design, mold manufacturing, raw material characteristics and raw material pretreatment methods, molding process, injection molding machine operation and other factors, and processing environment conditions, product cooling time, post-processing technology is closely related Manufacturing processes. Therefore, the quality of the product is not only depends on the injection molding machine injection molding accuracy, measurement accuracy, or simply by the mold design and mold processing accuracy level decision, usually, it will be affected by other factors and Restrictions.
With so many compounding factors, the defects of injection molded products are inevitable. Therefore, the intrinsic mechanism of seeking defects and the location and type of defects that may be predicted are investigated, and used to guide the design and improvement of molds and to induce defects. The law of production, to develop more reasonable conditions for the operation of the process is particularly important. We will explain the production mechanism and solutions of injection molding defects from the three major factors affecting the plastic material characteristics, mold structure, injection molding process and injection molding equipment in the injection molding process.
Injection molding products common defect classification
Plastic injection molding process used in a wide variety of raw materials, mold design is also a wide variety of types and forms, In addition, the operator for a particular injection molding machine familiarity and operating skills between workers, differences in practical experience are also different, At the same time, the objective environment (such as ambient temperature, humidity, air cleanliness) will also change with the seasons, these objective and subjective conditions together determine the injection molding products defects.
In general, the evaluation of the merits of plastic products, there are three main aspects:
First, the appearance of quality, including integrity, color, gloss;
Second, the accuracy of size and relative position, namely the dimensional accuracy and position accuracy;
Third, with the use of the corresponding mechanical properties, chemical properties, electrical properties, etc., that is functional
Therefore, if due to any of the above three aspects of a problem, it will lead to product defects and expansion.
Injection molding products common defect classification
Appearance defects: silver grain discoloration, weld marks
Process problems: flash, shrink, lack of plastic
Performance issues: warping, embrittlement