Blow Molding
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HDPE '2079851475616104457 temperature
Problem Phenomenon
HDPE '2079851475616104457 parison sags severely and the wall thickness is out of control
Cause Analysis
The parison temperature is too high, the melt strength is low, and it sags and stretches under its own weight; 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
Take the lower limit of parison temperature; match the extrusion speed; parison wall thickness program control; 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
Parison sag relies on the lower temperature limit and programmed wall thickness; 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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