Injection Molding
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PVC Check Ring
Problem Phenomenon
Unstable PVC metering causes product weight fluctuation
Cause Analysis
Check ring wear causes leakage, and the injection amount per shot fluctuates; during on-site troubleshooting, verify item by item according to this mechanism to 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 inspect and replace the check ring; weight SPC monitoring; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Metering stability depends on 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 troubleshooting reference for similar problems in the future
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