Extrusion & Post
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EVA dimensions change greatly with temperature
Problem Phenomenon
EVA product dimensions change >2% in the range of -20 to 60°C
Cause Analysis
EVA thermal expansion coefficient is large; low crystallinity causing high dimensional temperature sensitivity; no annealing treatment with residual stress
Solution
1) Add rigid fillers 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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