Below pipe making machine, pipe extrusion line, is to make small diameter PVC medical tube, like 2mm or 4mm etc. Produced pipe sizes are very precise. To meet high quality pipe quality requirement, the gravimetric material doser and laser diameter gauges are equipped. The doser is closed loop controlled with the extruder speed, it will auto feed the material as per extruder rotation speed, to guarantee the stability of pipe weight per meter.