How does shrinkage affect TPEs?
Shrinkage As TPEs cool from their molten state, the molecules align with each other and shrink the overall size of the molded part. While usually only in the thousandths of an inch per inch range, shrinkage can dramatically affect the molding and removal of the part as well as the appearance of the final part. If shrinkage is uneven, a part meant to lay flat can bend or warp. Additionally, in applications with tight tolerances, unexpected shrinkage may affect the fit of a part in an assembly. For these reasons, shrinkage generally must be taken into account in production. Part Removal When parts contain cores or cut-outs, as the elastomer shrinks it can tighten around the tooling, making removal difficult. Mold design, mold surface finish and processing conditions can lessen this effect, and make even automatic removal possible. Molding Conditions Molding conditions can dramatically affect the amount and nature of shrinkage. Going quickly from a state of high stress to one of low stres
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