Processing Machinery
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PPS Cleaning Forbidden Zone
Problem Phenomenon
After cleaning the barrel with PVC or POM material, PPS production shows severe degradation and corrosion
Cause Analysis
PVC and POM are forbidden for cleaning PPS barrels: PVC degrades at low temperature releasing HCl, and POM thermally decomposes releasing formaldehyde; contact with the high-temperature PPS melt causes violent reactions and corrodes the equipment
Solution
①Use HDPE (graded melt index) or PP as cleaning material; ②Strictly prohibit PVC/POM from entering the PPS barrel; ③Include material change records in shift handover management; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The forbidden zone for PPS cleaning is PVC and POM; this single misoperation can destroy the barrel, the screw, and the entire batch of products at the same time; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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