Type SG03 secondary coating line is mainly suitable for extruding of loose tube in which 2-12 cores optic fiber are contained and for extruding of tight coating optic fiber and filler element of Ф1.5-Ф5mm .It is suitable for the extruding of compound PBT, PA12 and PE. Loose tubes have excellent surface quality and uniform diameter size. line speed: 150m/min (Ф3.0) 200m/min (Ф2.0)