-Increasing the time pressure that keeps the mold to shape the product. -Adjust the temperature on the surface of the mold (note the difference between negative and positive mold mold section). -Check back for product structure design of mould, check the exact construction of the mold. -Select the material and shape of products to avoid internal stresses by (balance of thickness). Optimal mould by simulation software such as: Moldflow, Cmold, Moldex3D ...
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