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