What Is The Defect Classification Of Injection Molding

The injection molding process can be roughly divided into the following 6 stages:

Mold clamping, plastic injection, pressure keeping, cooling, mold opening, and product removal.

By repeating the above process, products can be produced periodically in batches. The molding of thermosetting plastics and rubber also includes the same process, but the barrel temperature is lower than that of thermoplastics, and the injection pressure is higher. .

Nowadays, the trend of processing technology is developing in the direction of high-tech. These technologies include: micro-injection, high-fill composite injection, water-assisted injection, mixed use of various special injection molding processes, foam injection, mold technology, simulation technology, etc.

Common Defect Classification Of Injection Molding Products

There are various plastic raw materials used in the injection molding process, and the types and forms of mold designs are also varied. In addition, the operator's familiarity with a specific injection molding machine, as well as the operational 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 occurrence of defects in injection molded products.

Generally speaking, there are three main aspects to evaluate the performance of plastic products:

First, the appearance quality, including integrity, color, gloss;

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

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

Therefore, if there is a problem due to any one of the above three aspects, it will lead to the generation and expansion of product defects.

Common Defect Classification Of Injection Molding Products

Appearance defects: silver streak discoloration, weld lines

Process problems: flash, shrinkage, lack of glue

Performance issues: warping, embrittlement

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