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In pressed plastic products, solving the problems of shrinkage coefficient very difficult. shrinkage coefficient is the parameter depends on many factors (temperature, volume, pressure, plastic components injection. ...)In plastic products, products with greater thickness, the greater the shrinkage factor triggers the defects concave co, warping, moreover with intricate detail work fill the plastic mixture is very difficult. Thus, the advent of injection technology aimed at solving this problem on the product allows to have empty holes in the Middle
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