Extrusion & Post
13 visualizações
Large PVA dimensional change with temperature
Fenómeno do problema
PVA product dimensions change >2% in the -20 to 60°C range
Análise das causas
PVA thermal expansion coefficient large; crystallinity on the low side causing high dimensional temperature sensitivity; no annealing treatment, residual stress present
Solução
1) Add rigid filler to reduce the 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 a large thermal expansion coefficient; adding filler and annealing are the key
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!