Processing Machinery
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Performance Decline Caused by Thermal Degradation of acrylonitrile-butadiene-styrene copolymer Material
Problem Phenomenon
The product undergoes thermal degradation during processing, the molecular weight decreases, the mechanical properties are reduced, and the color changes.
Cause Analysis
（1）The barrel temperature is too high, exceeding the 220-260°C upper limit
（2）The material stays in the barrel for too long
（3）The screw rotation speed is too fast, and excessive shear generates friction heat
（4）Material accumulates at the nozzle or check ring, degrading under long-term high temperature
（5）The regrind is processed multiple times, and the material molecular weight gradually decreases
Solution
（1）Strictly control the barrel temperature within the 220-260°C range
（2）Lower the temperature or empty the material in the barrel when shutting down
（3）Appropriately reduce the screw rotation speed
（4）Regularly clean the accumulated material at the nozzle and check ring
（5）Control the regrind ratio to no more than 15-20%
Key Takeaway
Thermal degradation is the main risk in processing, and controlling the temperature and reducing the residence time is the key.
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