Injection Molding
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POM melt overheating decomposition and spitting
Problem Phenomenon
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.
Cause Analysis
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.
Solution
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.
Key Takeaway
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.
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