Processing Machinery
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HDPE barrel temperature zoning
Problem Phenomenon
HDPE plasticization is uneven with entrained unmelted particles
Cause Analysis
The barrel temperature gradient is unreasonable, and melting in the compression section is insufficient; when troubleshooting on site, 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
Barrel gradient: rear section 180℃, middle section 210℃, front section 230℃; back pressure 0.3-0.8MPa; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
HDPE temperature gradient rises gently to ensure plasticization; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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