Injection Molding
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Severe Screw Wear of High-Density Polyethylene '2079851475616104452 Machine
Problem Phenomenon
After the screw has been used for a period of time, the plasticization efficiency decreases, and the product shows problems such as unmelted particles and uneven color.
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 intensifies
(4) The barrel temperature is set improperly, and the local temperature is too low, increasing the screw torque
(5) The design of the clearance 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 the screw speed
(3) Appropriately reduce the screw speed to 40-80rpm
(4) Reasonably set the barrel temperature to ensure the temperature of each section is within the range of 180-260°C
(5) Regularly check the screw clearance; repair or replace it 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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