Material Drying
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Surface Roughness Appearing on the Surface of Biaxially Oriented Polypropylene Film
Fenómeno del problema
Surface roughness appears on the film surface, affecting the appearance quality and subsequent processing performance of the film.
This defect often occurs in the production of biaxially oriented polypropylene film.
Análisis de la causa
(1) Improper extrusion temperature (140-170(stretching)/230-260(extrusion)°C) leads to unstable melt quality
(2) The die is in poor condition, with damage or material buildup on the lips
(3) The temperature or surface condition of the chill roll (15-40°C°C) is improper
(4) The raw material contains impurities or the moisture content is too high
(5) The stretching process parameters (stretch ratio: longitudinal 4-6, transverse 8-10) are set improperly
Solución
(1) Optimize the extrusion temperature to a reasonable value within the range of 140-170(stretching)/230-260(extrusion)°C
(2) Check and clean the die, and repair lip damage
(3) Adjust the chill roll temperature to within the range of 15-40°C°C, and check the roll surface condition
(4) Use clean raw materials and dry them fully (moisture content ≤0.02%)
(5) Adjust the stretch ratio to a reasonable value within the range of longitudinal 4-6 and transverse 8-10
Conclusión clave
Film surface defects need to be controlled from three aspects: extrusion temperature, die condition, and cooling conditions.
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