The conical twin-screw extruder offers unique advantages when processing PVC powder.The conical structure provides a large feed opening area,allowing smooth intake of bulky PVC dry blend powder and preventing bridging.During compression,the material is gradually compressed and plasticized gently,generating low shear heat,which effectively prevents the thermal degradation of heat-sensitive PVC.The low-speed,high-efficiency plasticization results in a uniform and high-quality melt.Concurrently,the smaller surface area on the thrust side of the screws reduces the axial force on the thrust bearing,extending the service life of the bearing and the entire transmission system.The equipment runs stably,making it particularly suitable for long-term,continuous production of high-quality PVC products.
The model SJSZ-65/132 indicates a screw diameter of 65mm at the metering end and 132mm at the feed end.The equivalent L/D ratio is typically around 22:1.The main drive power is 75kW,delivering high torque,with a low screw speed range(3-40 rpm)suitable for the low-temperature plasticization requirements of PVC.The screw core can often be temperature-controlled with oil for precise melt state management.The barrel heating/cooling system uses multi-zone control to ensure an accurate temperature profile.The machine design emphasizes a sturdy gearbox and high-capacity thrust bearings to handle the high loads in PVC processing.Standard configuration includes a forced,metered feeding device to ensure stable input and output.
The conical twin-screw extruder is almost tailor-made for PVC processing.Its primary application is producing various PVC pipes,including building water supply/drainage pipes,electrical conduits,and municipal double-wall corrugated pipes.In the profile sector,it is the main equipment for manufacturing PVC window and door profiles,indoor/outdoor decorative panels,skirting boards,and furniture edge banding.It is also used for producing PVC sheets and pellets.It can efficiently process rigid PVC(UPVC),soft PVC(SPVC),and some modified PVC compounds.For producers who primarily process PVC powder directly,the conical twin-screw extruder is an economical,reliable,and efficient choice.
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