Processing Machinery
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POM barrel temperature zoning
Problem Phenomenon
POM plasticization is uneven with unmelted particles entrained
Cause Analysis
The barrel temperature gradient is unreasonable, and melting is incomplete when the compression section temperature is insufficient; 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
Set the barrel with a gradient of 170°C at the rear section, 185°C at the middle section, and 200°C at the front section; back pressure 0.3-0.6MPa; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The POM barrel temperature gradient is gentle, and the back pressure should be low; 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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