Extrusion & Post
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PETG product post-shrinkage
Problem Phenomenon
The product continues to shrink 24-48 hours after demolding, and the dimensions change.
Cause Analysis
Rapid cooling puts the molecular chains in a non-equilibrium state, post-shrinkage continues, annealing insufficient.
Solution
Anneal promptly after demolding at 60-70°C to release stress; extend cooling time in the mold.
Key Takeaway
PETG post-shrinkage affects dimensional accuracy.
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