Injection Molding
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POM product weight fluctuation
Problem Phenomenon
During continuous production, product weight fluctuates periodically, synchronized with hydraulic system pressure fluctuations.
Cause Analysis
The injection machine's hydraulic or control system is unstable, causing the actual values of injection and holding pressure to fluctuate; check ring wear causes metering backflow, which also causes weight instability.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Overhaul the injection machine's hydraulic and control systems; ②disassemble and inspect check ring wear; ③stabilize melt temperature; ④establish weight SPC monitoring.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Weight fluctuation is a comprehensive reflection of equipment condition and process stability; SPC monitoring can detect drift early, and the check ring is a key inspection item.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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