The special twin conical screw extruder for all kinds of PVC powder material. It's high efficiency for mixing and extrusion, it has the advantages of low-speed cutting, hard decompositioin of material, even mixing of plasticity, high output, good quality, self-cleaning, wide application range, long service life. It's widely applied,if equipped with related Screw and other auxiliary accessories,based on the raw material of hot-plastics plastics, hot-coagulating plastics and rectified plastics,the following can be produced:PVC pipe, profile, plate, sheet, plastics-wood profile, foamed plate and sheet,rod profile,pelletizing,filming, hollow PVC product.Screw is water and oil cooled,and the barred is oil/air cooled and can be cooles quickly;its temperature tolerance is ±1℃. The vertical gearbox is compact and high reliable,which is suitable for PVC production.Automatic PLC tem perature is applied,and for common equipment, temperature gauges are employed.According different material presription form the customers, proper screw is fitted toachieve the best plasticity state and material quality so as to gain the best specific power and specific flow.All the screws are machined by the special-purpose milling machines, which is vital for the accuracy of the extrusion.The world advanced variable screw distance technique and depthvariable Screw technique are first applied, which makes material cutting and compression more gently. Special design of distribution box,particulary reinforced thrust bearing,imported bearing, longlife drive and high impact resistance are the advantages. The machinery is equipped width dosing feeding system. Main motor and feeding motot can be controlled by AC frequecy conberters and DC speed control variable system. Most of the electrial elements are imported,it has lots of malfuncion alarm fuction and it's easy operated. For those customers who require screw & barrel and gearbox critically,the European.