How to decide parts shrinkage

Parts shrinkage is playing a vital role in making plastic injection moulds, if we don’t know shrinkage rate of the raw materials, we could not start to design the moulds.
Many people will think that shrinkage rate is kind of physical properties for plastic raw materials, it is fixed when we inject the moulds, but it is wrong, shrinkage rate is not only affected by its own physical properties, but also affected by other factors…Here offer some changing rules for how to decide parts shrinkage rate.
You will wonder that which factors effect mould shrinkage rate except own properties:
1. Part thickness
2. Melt temperature
3. Injection rate
4. Holding pressure
5. Holding time
6. mold temperature
Below the change rules for the factors how to effect the shrinkage rate:

Link to this article:How to decide parts shrinkage

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Author: ceq12 1222