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Double-layer Co-extrusion Film Blowing Machine With Rotary Die Spec: Model 2SJ-G50 2SJ-G55 2SJ-G60 Diameter of screw ф50*2 ф55*2 ф60*2 L/D of screw 28:1 28:1 28:1 Layflat width of film(mm) 800 1000 ...