Processing Machinery
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PVA material changeover residue
Fenómeno del problema
After PVA material changeover, the first 5-10 products contain residue of the previous material, color difference and performance deviation
Análisis de la causa
Large amount of previous material residue in the barrel and screw; incomplete cleaning, residue in dead zones; insufficient purging material amount
Solución
1) Increase purging material amount to 2-3 times barrel capacity; 2) Increase rotation speed and temperature during purging to accelerate removal; 3) Disassemble the screw for thorough cleaning of dead zones
Conclusión clave
Changeover residue is caused by incomplete cleaning; full cleaning and disassembly are the key
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