Processing Machinery
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Screw wear of the random copolymer polypropylene pipe special material extruder causing poor plasticization (Variant: mass production scenario)
Fenómeno do problema
Unmelted particles appear in the product, the surface is rough, and the plasticization quality decreases.
Screw wear weakens the shearing and mixing effects, and the melt quality is unstable.
In particular, in continuous mass production, this problem is more prominent and needs key attention.
Análise das causas
（1）The screw is worn after long-term use, and the clearance between the thread and the barrel increases
（2）The raw material contains hard fillers that accelerate wear
（3）The wear resistance of the screw material is insufficient
（4）The screw speed is too high, aggravating wear
（5）The barrel temperature is improperly set, and local overload occurs
（6）In continuous mass production, process parameter fluctuations or equipment status changes have aggravated this problem
Solução
（1）Check the screw wear, and repair or replace it if the clearance exceeds 0.2mm
（2）Select wear-resistant screw materials or bimetallic screws
（3）Reduce the screw speed for filler-containing raw materials
（4）Optimize the barrel temperature settings to ensure that each section is at a reasonable value within the range of 200-220°C
（5）Regularly maintain the screw and clean the attachments on the screw surface
（6）And establish standardized work instructions, with special attention to parameter stability in continuous mass production
Conclusão principal
Screw wear leads to a decrease in plasticizing efficiency, and needs to be solved by selecting wear-resistant materials and regular maintenance.
In different production scenarios, targeted preventive measures need to be taken.
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