Extrusion & Post
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Large EVOH Dimensional Change with Temperature
Problem Phenomenon
EVOH product dimensions change >2% over the -20 to 60°C range
Cause Analysis
EVOH coefficient of thermal expansion large; crystallinity too low causing high dimensional temperature sensitivity; no annealing, residual stress present
Solution
1) Add rigid filler to lower coefficient of thermal expansion; 2) Annealing to stabilize dimensions; 3) Select high crystallinity grade to reduce temperature sensitivity
Key Takeaway
Dimensional temperature sensitivity is caused by large coefficient of thermal expansion; adding filler and annealing are key
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