Material Drying
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Extremely narrow temperature window in CAB processing
Problem Phenomenon
Extremely narrow temperature window in CAB processing; slightly high temperature causes degradation, slightly low temperature causes insufficient flowability, frequent defects
Cause Analysis
CAB poor thermal stability, 170-230°C window narrow, rapid degradation above 230°C
CAB high moisture content (0.30%), many vaporization defects at high temperature
CAB molecular chain contains butyrate ester groups, high thermal sensitivity
Screw shear plus high temperature, dual degradation
Drying temperature on the high side, oxidative degradation
Solution
Strictly control processing temperature within the 170-230°C window
Fully dry under 75-85°C/3-4h conditions to reduce moisture
Use low-shear screw to reduce degradation
Precisely control temperature control system deviation ≤2°C
Low-temperature long-time drying to avoid oxidation
Key Takeaway
CAB requires precise temperature control and drying within a narrow processing window
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