Why is it important to have the sections of the molded part as uniform in thickness as possible?
What will be an ideal response?
Thick sections cool more slowly than thin sections because of the time required for the heat to move through the plastic material. The cooling occurs from the outside toward the middle because the heat is transferred most easily from the outside. Therefore, the inside is liquid after the outside is solid. Because of the natural shrinkage that occurs upon cooling, the liquid can still shrink whereas the outside, which is solid, cannot. This may cause a sink mark over the center
section as it cools and shrinks. This problem can be solved by making all the sections of the same thickness.
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