... to buy double screw plastic extruder made in China from us.1.Application SJSZ series plastic conical twin-screw extruder is ... composed of barrel screw, gear transmission system, measurable feeding, vacuum ... SJSZ-45, 50, 55, 65, 68, 80, 92 conical twin-screw extruders. This series of extruders have excellent advantages of good ...