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what is shrinkage ?

Edit: ABIS Mold Technology Co.,Ltd    Date: Jul 11, 2017
source:

Shrinkage is inherent in the injection molding process. Shrinkage occurs because the density of polymer varies from the processing temperature to the ambient temperature
There are linear and volumetric shrinkage. Both methods are difficult to measure accurately.

Relation Between Injection parameter setting and shrinkage
picture below shown relation between shrinkage and injection machine parameter.


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