When looking critically at the causes of warpage, you could conclude that virtually any aspect of the molding process will have some effect on the warpage of the part. The four major categories that contribute to warpage are listed below:
Mold design .
Once you know that a part is going to warp outside the design criteria for that part, something will need to be changed with the part design, injection mold design, or processing to reduce the warpage.
Reducing warpage to within design criteria is critical for a successful part. The earlier this can be done in the product design cycle the better. Much of the time, reducing warpage involves changing the part design, however, changing the tooling design can also be an important component in reducing warpage. The cost of change is least when it is done early in the design cycle and will also mean less time to production.From Website
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