Injection Molding
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POM check ring wear
Problem Phenomenon
POM metering is unstable and product weight fluctuates
Cause Analysis
Check ring wear causes material leakage, and the actual injection amount of each shot fluctuates; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Regularly check the check ring clearance; replace when wear exceeds the standard; monitor weight with SPC; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Metering stability is guaranteed by the check ring condition; 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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