Extrusion & Post
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HDPE pipe screw wear and output decline
Problembeschreibung
Under the same process, the extrusion output gradually declines, melt pressure fluctuation increases, and disassembly inspection confirms screw flight wear.
Ursachenanalyse
Long-term wear of the screw and barrel increases the gap and reduces conveying and pressure-building ability; hard impurities in filled material or recycled material accelerate the wear process.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Lösung
①Regularly test the screw gap; ②repair or replace the screw after wear exceeds the limit; ③control regrind impurities; ④monitor melt pressure and output trends for early warning.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Screw wear is a chronic performance decline; melt pressure and output trend monitoring can provide early warning and avoid sudden quality accidents.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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