How to improve the precision of thin wall injection molding?

The application range of plastic parts is more and more wide, from simple tableware, kitchenware to complex mechanical parts, electronic products shell are useful to plastic parts, but for electronic products shell and other high precision requirements of plastic parts, in injection molding manufacturing from the beginning of the mold manufacturing should pay attention to its precision requirements.

What factors determine the accuracy of plastic parts in the injection molding process stage? How can we improve the precision of thin wall injection molding?

1. Close molding: in principle, it should be greater than the total pressure of plastic injection into the mold, with no raw edge as the benchmark.

2. The pressure and speed have part of the same relationship. The purpose of acting on the mold is to make the raw materials enter the mold evenly, thoroughly and appropriately. Too low will shoot short, shrink, too high hair, too full, sticky mold, burnt, vulnerable mold and high internal stress undesirable phenomenon.

3. The speed determines the condition of raw materials in the mold runner and the finished product. Fast there are raw edges, too full and burnt, slow there will be short shooting, shrinkage, poor combination and easy to break.

4. The temperature of raw materials is different, and the temperature is different. Too low melt adhesive is not permeable, resulting in uneven color and increased internal stress of finished products. Because the temperature is too low and the pressurization is too high, it may cause screw fracture, too high, the product has rough edges, and the temperature difference is caused by cooling, causing shrinkage. Raw materials decompose, turn yellow, discolor, and break easily. The cooling time becomes longer, and the air is not easily discharged.

Summary：

The application range of plastic parts is more and more wide, from simple tableware, kitchenware to complex mechanical parts, electronic products shell are useful to plastic parts, but for electronic products shell and other high precision requirements of plastic parts, in injection molding manufacturing from the beginning of the mold manufacturing should pay attention to its precision requirements.

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Date：

2022-11-30

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