*Special single screw extruder for polyolefin, having high extruding velocity and effective plasticization. *Separation mixing screw specialized for polyolefin. *Specially designed three co-extruding die, reasonable channel, smooth outside and inside wall, and little internal stress. *Producing pipe limit Φ20- Φ160mm, manufacture velocity up to 16m/min. *May be used to produce HDPE silicon core tube, ordinary PP-R, PE and PEX pipes. *Low cost: The cost of nanometer & anti-virus pipe is merely increase 5-10% on the ordinary pipe basis.