Extrusion & Post
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Melt fracture on ABS extrusion surface
Fenómeno do problema
Periodic roughness, sharkskin-like or orange-peel-like texture appears on the surface of ABS extruded plates/sheets, more obvious after the line speed increases.
Análise das causas
The shear stress of the melt at the die lip outlet exceeds the critical value and melt fracture occurs; low die temperature and too fast extrusion speed are common inducements, and ABS's viscosity characteristics make it more easily triggered during high-speed extrusion.
Solução
①Increase the die temperature by 3~5℃; ②reduce the screw speed/line speed; ③clean and polish the die lip; ④add fluorine-containing processing aid (PPA) when necessary; ⑤evaluate easy-processing grades for stubborn cases.
Conclusão principal
The main line for ABS extrusion surface roughness is 'reducing outlet shear': raise temperature, reduce speed, polish, and add PPA in sequence; when pursuing output, find the balance point between speed and surface quality.
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