Injection Molding
2 visualizaciones
Low weld line strength in PVA '2079851475616104452
Fenómeno del problema
Strength at the weld line of PVA injection molded multi-gate products is only 30-40% of the whole
Análisis de la causa
Temperatures of the two melt fronts have dropped, causing small molecular chain diffusion depth and insufficient entanglement; dispersed phase orientation discontinuous at the weld line
Solución
1) Increase injection temperature by 10-15°C to increase diffusion depth; 2) Increase injection speed to keep front temperature higher; 3) Increase holding pressure to ensure compaction at the weld; 4) Set overflow groove at the weld line and cut it off afterwards
Conclusión clave
Low weld line strength is caused by insufficient molecular entanglement; high-temperature high-speed injection and overflow groove are effective countermeasures
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!