Processing Machinery
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HDPE melt temperature too low
Problem Phenomenon
The HDPE melt temperature was set to 190℃, and the product surface is rough with obvious flow marks
Cause Analysis
When the temperature is too low, the melt viscosity is large, causing filling flow marks and rough surface; 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
Raise the melt temperature to 210-250℃; take the upper limit for thin walls and long flow paths; 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
The lower limit of HDPE temperature ensures flow and surface quality; 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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