Processing Machinery
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EVA purging is difficult
Problem Phenomenon
EVA purging requires 2-3h, time-consuming and affecting changeover efficiency
Cause Analysis
EVA has strong adhesion, forming a firm adhesive layer on the screw and barrel; EVA 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 EVA residue; 2) Reduce purging temperature below the EVA softening point to reduce adhesion; 3) Use a dedicated purging compound
Key Takeaway
Purging difficulty is caused by EVA's strong adhesion; PE flushing and temperature reduction are key
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