Processing Machinery
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HDPE back pressure control
Problem Phenomenon
HDPE back pressure is too high and the melt temperature rises significantly
Cause Analysis
High back pressure generates heat by shear, and the actual melt temperature exceeds the standard; 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
Control the back pressure at 0.3-0.8MPa; monitor the actual measured melt temperature; after adjustment, continuously sample 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
HDPE back pressure should be moderate to prevent shear overheating; 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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