Injection Molding
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Severe screw wear of general-purpose polyethylene '2079851475616104452 machine
Problem Phenomenon
After the screw has been used for a period of time, the plasticizing efficiency decreases, and the products show unmelted particles, uneven color, and other problems.
Screw wear leads to inaccurate metering and poor mixing, affecting product quality and production efficiency.
Cause Analysis
（1）The wear resistance of the screw material is insufficient or the surface treatment is improper
（2）The raw material contains hard fillers (such as glass fiber, talc powder, etc.) that accelerate wear
（3）The screw speed is too high, and the friction with the barrel is intensified
（4）The barrel temperature is improperly set, and the local temperature is too low, increasing the screw torque
（5）The clearance design between the screw and the barrel is unreasonable
Solution
（1）Select wear-resistant screw materials (such as 38CrMoAlA nitrided) or bimetallic screws
（2）Use wear-resistant screws and barrels for filler-containing raw materials, and reduce the screw speed
（3）Appropriately reduce the screw speed to 40-80rpm
（4）Reasonably set the barrel temperature to ensure that the temperature of each section is within the range of 160-260°C
（5）Regularly check the screw clearance, and repair or replace it if it exceeds 0.2mm
Key Takeaway
Screw wear is caused by materials, fillers, and operating parameters, and wear-resistant materials need to be selected and operating parameters reasonably controlled.
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