Molding Process
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Anisotropy of shrinkage rate
Problem Phenomenon
The shrinkage rate difference in different directions is >0.5%
Cause Analysis
Semi-crystalline polymers crystallize differently in the flow direction and the perpendicular direction
Solution
Uniform mold temperature, extended holding pressure, and symmetric gate arrangement
Key Takeaway
The shrinkage anisotropy of semi-crystalline materials is significant
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