Processing Machinery
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Narrow processing temperature window of styrene-acrylonitrile copolymer MSAN
Problem Phenomenon
The MSAN processing temperature range is narrow (200-260°C); slightly lower causes poor plasticization, slightly higher causes degradation.
Cause Analysis
(1) MSAN has good heat resistance but a narrow thermal stability window
(2) Barrel temperature control accuracy is insufficient, with large fluctuation
(3) Screw speed is too fast, and shear heat raises the temperature
(4) Material residence time is too long, with local overheating
(5) The regrind proportion is high, and material thermal stability declines
Solution
(1) Precisely control barrel temperature, with fluctuation ≤±2°C
(2) Appropriately reduce screw speed to reduce shear heat
(3) Shorten material residence time
(4) Control the regrind proportion to no more than 10%
(5) Use precision temperature control equipment
Key Takeaway
The narrow MSAN processing temperature window requires precise temperature control.
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