Extrusion & Post
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HDPE pipe screw wear and output decline
Problem Phenomenon
Under the same process, the extrusion output gradually declines, melt pressure fluctuation increases, and disassembly inspection confirms screw flight wear.
Cause Analysis
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
Solution
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
Key Takeaway
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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