Processing Machinery
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POM shutdown cleaning procedure
Problem Phenomenon
Heating was turned off directly after shutdown; when restarting, the products discolored and decomposed in batches, and cleaning was difficult
Cause Analysis
After POM shutdown, the residual melt continues to decompose under residual heat, and formaldehyde and formic acid corrode the screw and barrel and contaminate the next batch; halogen-containing or acidic polymer residues in contact with POM can even react violently
Solution
①Before shutdown, clean and purge the barrel with PE or PP; ②cool the barrel to 150°C and push the screw to the front; ③after using halogen-containing polymers, the machine must be thoroughly cleaned with PE before running POM
Key Takeaway
The POM shutdown procedure is a safety red line; the three steps of PE/PP purging, cooling, and cleaning—omitting any one of them is an accident hazard; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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