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