Extrusion & Post
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Glass Fibre dimension changes greatly with temperature
Problem Phenomenon
Glass Fibre product dimension changes >2% in -20 to 60°C range
Cause Analysis
Glass Fibre thermal expansion coefficient large; crystallinity too low causes 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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