PVC Double Pipe Extrusion Line

1. Usage & Scope of application This production line is mainly used to produce PVC small and medium size pipe. The pipes are mainly used in for cold bending electrical casing and cable protecting, etc. 2. Machine list & Characteristics Process flow chart of PVC pipe production line Main production process: raw material + additive → Mixing → material conveying → Forced feeding → Conical twin screw extruder → extruding mould → Diameter control unit → Spraying vacuum shaping box → spraying/immersion type cooling water tank → marking machine → caterpillar tractor → cutter → pipe expanding machine → Pipe stacker → pipe inspection & packing 1. Raw material mixing: add other auxiliary materials such as PVC stabilizer, plasticizer, antioxidant into high speed mixer according to process proportion, after high speed running, the material temperature will be increased to required process temperature through self-friction. Then the material will be discharged into cooling mixer to avoid plasticizing agglomeration. After cooling, the material will be manually sent to extruder or through conveyor. 2. Extruder: the extruder is fixed with quantificationally feeding device to match the extrusion amount and charging amount. As conical screw extruder, the diameter of feeding section is bigger, so the heat transfer area is big and shear velocity also high, therefore it is better for material plasticizing. The diameter of metering section is small, so the heat transfer area is small and melt shear velocity is low to extrude the melt at lower temperature. The feeding device and screw driving device are all controlled by inverter to achieve synchronous speed regulation. 3. Extruding mould: the pvc material from extruder will be pushed to mould by subsequent material. Mould is the critical part for pipe forming. Theoretically if the component or content of pipe is different, the mould is also different. So customers should choose the right mould according to the real produ....

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