Extrusion & Post
10 조회수
Large dimensional change of PU with temperature
문제 현상
PU product dimensions change >2% in the range of -20 to 60°C
원인 분석
PU thermal expansion coefficient large; crystallinity too low causing high dimensional temperature sensitivity; no annealing, residual stress present
해결 방법
1) Add rigid filler to reduce thermal expansion coefficient; 2) Annealing treatment to stabilize dimensions; 3) Select high crystallinity grade to reduce temperature sensitivity
핵심 요약
Dimensional temperature sensitivity is caused by large thermal expansion coefficient; adding filler and annealing are key
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