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