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According the product design rule regarding injection plastic molding technology to design plastic molds is necessary.

Plastic parts design
The following information is a summary of part structure aspects that him and I will check. Your part have to have at least 0. 5 degrees of draft angles parallel in the parting direction to facilitate easy withdrawal in the custom molds. Uniform Wall thickness can be your part of a similar thickness at all areas.

A Uniform wall membrane thickness will assure uniform cooling in addition to reduce defects. Also ensure that the wall width isn't too thick and may be decreased exactly where necessary. Make sure you will discover no sharp part and make round corners to circumvent stress concentration. The inside part radius should be at least one material thickness.

Central out thick sections. When you feel the part needs to be stiff, use ribs instead of thick walls. Best position of one's gate location is for a thick part, so the shrinkage could be more uniform. Product design ribs where the part is very thick. This will stay away from some material.