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How to solve molded part sidewall dents?
The expansion and contraction during the molding of plastic materials is related to the thermal expansion coefficient of the processed plastic. The coefficient of thermal expansion during molding is called 'mold shrinkage'. As the molded part cools and shrinks, the molded part loses close contact with the cooling surface of the mold cavity, and the cooling efficiency decreases. At this time, the molding continues to shrink in the cold zone.
Among them, the molded parts of semi-crystalline plastic materials have a high shrinkage rate, which makes the problem of dents more serious; the molding shrinkage of amorphous materials is low, which will greatly reduce the occurrence of dents.
Molded parts with thick walls have a long cooling time and are more prone to large shrinkage. Therefore, the large thickness is the root cause of the dent. Attention should be paid to the design of injection molded parts, and thick-walled parts should be avoided as much as possible. If the thick wall is uneven, it should be designed to be hollow.
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