Injection Molding
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Severe Screw Wear of Block Copolymer Polypropylene '2079851475616104452 Machine
Problem Phenomenon
After the screw is used for a period of time, the plasticizing efficiency decreases, and problems such as unmelted particles and uneven color appear in the product.
Screw wear causes 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 rotation speed is too high, and the friction with the barrel intensifies
（4）The barrel temperature is set improperly, and the local temperature is too low, increasing the screw torque
（5）The gap design between the screw and the barrel is unreasonable
Solution
（1）Select wear-resistant screw materials (such as 38CrMoAlA nitriding treatment) or bimetallic screws
（2）Use wear-resistant screws and barrels for raw materials containing fillers, and reduce the screw rotation speed
（3）Appropriately reduce the screw rotation speed to 40-80rpm
（4）Reasonably set the barrel temperature to ensure the temperature of each section is within the 200-270°C range
（5）Regularly check the screw gap, 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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