Injection Molding
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Severe screw wear of random copolymer polypropylene injection machine
Problem Phenomenon
After a period of use, screw plasticizing efficiency declines, and products show unmelted particles, uneven color and other problems.
Screw wear causes inaccurate metering and poor mixing, affecting product quality and production efficiency.
Cause Analysis
(1) The screw material has insufficient wear resistance or improper surface treatment
(2) The raw material contains hard fillers (such as glass fiber, talc powder, etc.) that accelerate wear
(3) Screw speed is too high, intensifying friction with the barrel
(4) Improper barrel temperature setting; local temperature too low increases screw torque
(5) The clearance design between the screw and the barrel is unreasonable
Solution
(1) Select wear-resistant screw materials (such as 38CrMoAlA with nitriding treatment) or bimetallic screws
(2) Use wear-resistant screws and barrels for filler-containing raw materials, and reduce screw speed
(3) Appropriately reduce screw speed to 40-80rpm
(4) Reasonably set barrel temperature to ensure each section is within the 190-260°C range
(5) Regularly check screw clearance; repair or replace if it exceeds 0.2mm
Key Takeaway
Screw wear is caused by materials, fillers and operating parameters; wear-resistant materials need to be selected and operating parameters reasonably controlled.
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