Material Drying
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POM moisture content control
Problem Phenomenon
Tiny bubbles appear intermittently on POM products, suspected to be moisture but the standard is unknown
Cause Analysis
The moisture content for POM molding should be controlled below 0.1%; when exceeded, the moisture vaporizes into bubbles in the melt; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Use a moisture meter to sample-check that the moisture content is below 0.1%; dry moisture-affected material at 100°C for 2 hours and re-test; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Control POM moisture content at 0.1%, and start the machine only after sample confirmation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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