Processing Machinery
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PU material changeover residue
Problem Phenomenon
After PU material changeover, the first 5-10 products contain previous material residue, color difference and performance deviation
Cause Analysis
Large amount of previous material residue in barrel and screw; incomplete cleaning, residue in dead zones; insufficient purging material amount
Solution
1) Increase purging material amount to 2-3 times barrel capacity; 2) Increase speed and temperature during cleaning to accelerate removal; 3) Disassemble the 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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