Processing Machinery
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Difficult machine purging of EAA
Problem Phenomenon
EAA machine purging takes 2-3h, affecting changeover efficiency
Cause Analysis
EAA has strong adhesion, forming a firm adhesive layer on the screw and barrel; EAA has poor thermal stability, becomes sticky at high temperature and is more difficult to remove
Solution
1) Flush with high-viscosity PE before purging to carry away EAA residue; 2) Lower the purging temperature below the softening point of EAA to reduce adhesion; 3) Use a dedicated purging material
Key Takeaway
Difficult purging is caused by the strong adhesion of EAA; PE flushing and temperature reduction are the key
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