Injection Molding
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Severe screw wear of low density polyethylene injection machine
Problem Phenomenon
After the screw has been used for a period of time, plasticizing efficiency decreases, and products show problems such as unmelted particles and uneven color.
Screw wear causes inaccurate metering and poor mixing, affecting product quality and production efficiency.
Cause Analysis
(1) Insufficient wear resistance of screw material or improper surface treatment
(2) Hard fillers in the raw material (such as glass fiber, talc, etc.) accelerate wear
(3) Screw rotation speed too high, increased friction with the barrel
(4) Improper barrel temperature setting; local temperature too low increases screw torque
(5) Unreasonable design of the clearance between screw and barrel
Solution
(1) Select wear-resistant screw material (such as 38CrMoAlA nitriding treatment) or bimetallic screw
(2) Use wear-resistant screw and barrel for filled raw materials, reduce screw rotation speed
(3) Appropriately reduce screw rotation speed to 40-80rpm
(4) Reasonably set barrel temperature, ensure each zone temperature within the 160-220°C range
(5) Regularly check screw clearance; repair or replace if it exceeds 0.2mm
Key Takeaway
Screw wear is caused by material, fillers, and operating parameters; wear-resistant materials need to be selected and operating parameters reasonably controlled.
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