Extrusion & Post
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PVC Extrusion Output Decline
Problem Phenomenon
Output gradually decreases, plasticization worsens.
Cause Analysis
Screw and barrel wear (PVC fillers are highly abrasive), screen pack blockage; PVC contains many fillers, wears faster; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Measure screw—barrel clearance, replace if exceeding standard; ②Use wear-resistant material screw and barrel; ③Replace screen pack and monitor pressure differential; ④Stabilize feeding (forced feeding/stirring to prevent bridging); ⑤Establish regular screw and mold wear monitoring system.
Key Takeaway
PVC output decline = 'wear + screen blockage': PVC fillers are highly abrasive, screw life is short; wear-resistant materials and regular clearance measurement are the hardware basis for maintaining output; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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