Processing Machinery
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HDPE Anisotropy
Problem Phenomenon
HDPE product shrinkage differs greatly between flow direction and perpendicular direction
Cause Analysis
HDPE crystallization orientation makes shrinkage differ in the two directions, turning rectangular parts into rhombic shapes; 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
Position the gate to make flow symmetric; optimize holding pressure; mold flow analysis prediction for precision parts; 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
Anisotropy is controlled by flow symmetry and mold flow prediction; 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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