Extrusion & Post
14 visualizaciones
Large PVA dimensional change with temperature
Fenómeno del problema
PVA product dimensions change >2% in the -20 to 60°C range
Análisis de la causa
PVA thermal expansion coefficient large; crystallinity on the low side causing high dimensional temperature sensitivity; no annealing treatment, residual stress present
Solución
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
Conclusión clave
Dimensional temperature sensitivity is caused by a large thermal expansion coefficient; adding filler and annealing are the key
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!