Processing Machinery
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HDPE Molecular Weight Selection
Problem Phenomenon
Products of different grades both called HDPE differ greatly in strength
Cause Analysis
HDPE molecular weight (melt index) differences cause significant differences in mechanical properties and processability; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Select melt index according to product requirements: high flow for '2079851475616104452, low melt index and high strength for '2079851475616104457 and extrusion; 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 grades are matched to process and strength by melt index; after confirming effectiveness, solidify 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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