Extrusion & Post
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Narrow Processing Temperature Window of Biaxially Oriented Polypropylene Film MSAN Products
Fenómeno do problema
The processing temperature range of MSAN is narrow (140-170(stretching)/230-260(extrusion)°C); a slightly lower temperature causes poor plasticization, and a slightly higher temperature causes degradation.
Análise das causas
(1) MSAN has good heat resistance but a narrow thermal stability window
(2) The barrel temperature control precision is insufficient, and the fluctuation is large
(3) The screw speed is too fast, and the shear heat raises the temperature
(4) The material residence time is too long, causing local overheating
(5) The regrind ratio is high, and the thermal stability of the material decreases
Solução
(1) Precisely control the barrel temperature, with fluctuation ≤±2°C
(2) Appropriately reduce the screw speed to reduce shear heat
(3) Shorten the material residence time
(4) Control the regrind ratio to not exceed 10%
(5) Use precision temperature control equipment
Conclusão principal
The processing temperature window of MSAN is narrow, and the temperature needs to be precisely controlled.
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