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