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