Processing Machinery
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Narrow processing temperature window of high impact polystyrene MSAN products
Problem Phenomenon
MSAN processing temperature range is narrow (180-240°C); slightly lower temperature causes poor plasticization, slightly higher causes degradation.
Cause Analysis
(1) MSAN has good heat resistance but a narrow thermal stability window
(2) Insufficient barrel temperature control accuracy, large fluctuation
(3) Screw rotation speed too fast, shear heat raises the temperature
(4) Material residence time too long, local overheating
(5) High regrind ratio, material thermal stability decreases
Solution
(1) Precisely control barrel temperature, fluctuation ≤±2°C
(2) Appropriately reduce screw rotation speed, reduce shear heat
(3) Shorten material residence time
(4) Control regrind ratio not exceeding 10%
(5) Use precision temperature control equipment
Key Takeaway
MSAN's narrow processing temperature window requires precise temperature control.
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