-Plastic injection process, the processing of product shrinkage coefficient is very difficult. Coefficient of shrinkage depends on many different factors such as the temperature, volume, pressure, and the calculation is also dependent on the designer experience. The major product, the greater the shrinkage factor of easy triggers the defects, warping, the ability to fill out, ... Therefore, this technology is launched to remedy the problem with the product allow the empty hole in the middle.
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