Processing Machinery
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EVOH Material Changeover Residue
Problem Phenomenon
After EVOH material changeover, the first 5-10 products contain previous material residue with color difference and property deviation
Cause Analysis
Large amount of previous material residue in barrel and screw; cleaning incomplete with residue in dead zones; purging compound amount insufficient
Solution
1) Increase purging compound amount to 2-3 times barrel capacity; 2) Increase rotation speed and temperature during cleaning to accelerate removal; 3) Disassemble screw to thoroughly clean dead zones
Key Takeaway
Changeover residue is caused by incomplete cleaning; thorough cleaning and disassembly are key
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