SJSZ series conical twin-screw extrusion machine can extrude various kinds of thermoplastics to be tubes, sheets, boards films, profiles, etc when equipped with related screw and auxillary parts. Moreover, it can be qualified for the process of modifying plastics and pelletizing porders. This machine adopts AC motor, infinite speed variation by frequency converter, overload protection, trouble alarm, constant oil tem-perature in the screw, oil coolling in the varrel and the devices of vacuum exhaustiong as well as fixed quantity feeding. Main Technical Parameter: Model