Processing Machinery
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ASA high-temperature residence decomposition
Fenómeno do problema
After ASA production shutdown and restart, the product shows yellow burnt spots and black specks, residual material in the barrel is obviously discolored, and long-time purging is needed for recovery.
Análise das causas
ASA will degrade significantly when residing above 280°C for a long time; even at normal temperature, excessive residence deteriorates the rubber phase; continued heating of residual material in the barrel during shutdown is the main cause of degradation.
Solução
①Avoid long residence above 280°C (Plastribution red line); ②lower barrel temperature immediately upon shutdown; ③purge and replace material before resuming production; ④establish graded disposal specifications according to shutdown duration.
Conclusão principal
The core of ASA shutdown management is control of the product of temperature and time; 280°C is a clear red line; graded disposal specifications avoid one-size-fits-all waste or release risk.
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