Causes: -Warping caused by shrinkage change throughout the product. -This phenomenon is due to a small section on the product have high shrinkage, leading to distortion. -The products taken out too soon yet to define. -Design of the mold (mold cooling system) do not match and the product thickness differences lead to different mold pressure and shrinkage. -Mold surface temperature variances. How to fix: -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. -Avoid internal stresses by selecting the material and the shape of the product (balance of thickness). Optimal mould by simulation software such as: Moldflow, Cmold, Moldex3D ...
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