Processing Machinery
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Random copolymer polypropylene pipe special material (Nordic standard） extruder screw wear causing poor plasticization（Variant: Mass Production Scenario）
Problem Phenomenon
Unmelted particles appear in the product, the surface is rough, and plasticization quality declines.
Screw wear weakens the shear and mixing effect, making melt quality unstable.In particular, during continuous mass production, this problem is more prominent and requires key attention.
Cause Analysis
（1）The screw wears after long-term use, the clearance between flights and barrel increases\
（2）The raw material contains hard fillers accelerating wear\
（3）The screw material wear resistance is insufficient\
（4）Screw speed too high aggravates wear\
（5）Barrel temperature set improperly, local overload\
（6）In continuous mass production, process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Check screw wear, repair or replace if the clearance exceeds 0.2mm\
（2）Select wear-resistant screw materials or bimetallic screws\
（3）Reduce screw speed for filler-containing raw materials\
（4）Optimize barrel temperature settings, ensure each section is at a reasonable value within the 200-220°C range\
（5）Regularly maintain the screw, clean deposits on the screw surface\
（6）And establish standardized work instructions, paying special attention to parameter stability in continuous mass production
Key Takeaway
Screw wear causes plasticization efficiency to decline, and needs to be solved by selecting wear-resistant materials and regular maintenance.Targeted preventive measures need to be taken in different production scenarios.
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