Molds & Tooling
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POM hot runner color change
Problem Phenomenon
POM hot runner molds show color mixing for a long time after color change
Cause Analysis
Old color material remains in the hot runner, and POM's flow characteristics make purging slow; 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
Sequence color changes from light to dark; flush the hot runner at elevated temperature; use sufficient transition material after color change; 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
Color change management requires production sequencing plus sufficient flushing; 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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