Extrusion & Post
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POE dimension changes greatly with temperature
Problem Phenomenon
POE product dimension changes >2% in the range -20 to 60°C
Cause Analysis
POE thermal expansion coefficient large; crystallinity low causing high dimensional temperature sensitivity; no annealing treatment, residual stress present
Solution
1) Add rigid filler to reduce 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 large thermal expansion coefficient; adding filler and annealing are key
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