Injection Molding
3 visualizaciones
POM melt overheating decomposition and spitting
Fenómeno del problema
During '2079851475616104452, melt suddenly spurts from the nozzle accompanied by a pungent formaldehyde odor, splash marks and bubbles appear on products, and the odor at the operation site is choking.
Análisis de la causa
When the melt temperature exceeds 230℃, POM undergoes thermal decomposition, releasing formaldehyde gas and accumulating pressure in the barrel; when excessive temperature is combined with excessively long residence time, the gas pushes the melt out of the nozzle.
Solución
①Immediately reduce the melt temperature below 210℃; ②shorten the barrel residence time; ③thoroughly clean the barrel with cleaning compound; ④check whether the thermocouple is inaccurate causing the actual temperature to be too high.
Conclusión clave
POM decomposition spitting involves both quality and safety risks; managing melt temperature and residence time as safety red lines is the most important on-site habit in POM processing.
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!