Extrusion & Post
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DSTDP large dimensional change with temperature
Problem Phenomenon
DSTDP product dimension changes >2% in the range of -20 to 60°C
Cause Analysis
DSTDP thermal expansion coefficient large; crystallinity on the low side causing high temperature sensitivity of dimensions; not annealed, residual stress present
Solution
1) Add rigid filler to reduce thermal expansion coefficient; 2) annealing treatment to stabilize dimensions; 3) select high crystallinity grades 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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