Processing Machinery
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ASA high-temperature residence decomposition
Problem Phenomenon
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.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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