Extrusion & Post
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MP large dimensional change with temperature
Problem Phenomenon
MP product dimensions change >2% in the -20 to 60°C range
Cause Analysis
MP thermal expansion coefficient large; crystallinity low causing high dimensional temperature sensitivity; not annealed, residual stress present
Solution
1) add rigid filler to lower the thermal expansion coefficient; 2) annealing to stabilize dimensions; 3) select a high crystallinity grade to reduce temperature sensitivity
Key Takeaway
dimensional temperature sensitivity is caused by large thermal expansion coefficient; adding filler and annealing are key
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