Large diameter winding pipe(from 150mm to 3000mm in diameter) is becoming as a replacement of cement pipe and casting iron pipe since it possesses many advantages such as easy operation and low cost of assembling, tight juncture between the pipes, no pollution and so on. It is being widely used as sewerage and drainage pipe nowadays. Top quality by advanced technology. High speed and excellent extruding quality by adopting two sets of single screw extruders with high efficiency performances. Unique design of composite die head for large diameter winding pipe