Extrusion & Post
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DSTDP film excessive thermal shrinkage
Problem Phenomenon
DSTDP film thermal shrinkage at 80°C >12%, exceeding the 5% dimensional stability requirement
Cause Analysis
DSTDP extrusion orientation is released after heating causing large shrinkage; DSTDP thermal expansion coefficient large; film cooling froze a large amount of orientation stress
Solution
1) Reduce extrusion draw ratio to reduce frozen-in orientation; 2) film annealing treatment at 60-80°C to release orientation stress; 3) add 5-10wt% rigid resin to reduce thermal shrinkage; 4) biaxial stretching process to balance orientation
Key Takeaway
Film thermal shrinkage is caused by frozen-in orientation; reducing draw ratio and annealing treatment are key
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