Molds & Tooling
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HDPE hot runner temperature
Problem Phenomenon
Serious stringing at the gate of the HDPE hot runner mold
Cause Analysis
The hot runner temperature is too high, making the melt viscosity low and causing gate stringing; 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
Calibrate the hot runner temperature; appropriately lower the temperature in the gate area; clean regularly; 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 hot runner stringing relies on gate temperature control; 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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