Extrusion & Post
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High boiling water shrinkage rate of PET fiber
Problem Phenomenon
The boiling water shrinkage rate of PET fiber exceeds the standard (>5%), and the dimensions of finished products are unstable.
Cause Analysis
Insufficient heat setting after fiber drawing results in high molecular chain internal stress; draw ratio is too large; heat setting temperature is low or time is short.
Solution
Increase heat setting temperature and extend setting time; appropriately reduce the draw ratio; adopt relaxation heat treatment process.
Key Takeaway
PET fiber boiling water shrinkage rate reflects the internal stress level; full heat setting is the control means.
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