Extrusion & Post
13 visualizações
Large dimensional change of PU with temperature
Fenómeno do problema
PU product dimensions change >2% in the range of -20 to 60°C
Análise das causas
PU thermal expansion coefficient large; crystallinity too low causing high dimensional temperature sensitivity; no annealing, residual stress present
Solução
1) Add rigid filler to reduce thermal expansion coefficient; 2) Annealing treatment to stabilize dimensions; 3) Select high crystallinity grade to reduce temperature sensitivity
Conclusão principal
Dimensional temperature sensitivity is caused by large thermal expansion coefficient; adding filler and annealing are key
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!