The invention discloses an extruding and forming method of a
polyethylene pipe for
water supply. The extruding and forming method of the
polyethylene pipe for
water supply comprises the following steps: (1) vacuumizing high-density
polyethylene resin and black master batch, and stirring and mixing at high speed uniformly by a high-speed mixing
machine after vacuumizing treatment, wherein the
moisture content of uniformly
mixed materials is below 0.4%; (2) adding the uniformly
mixed materials into a material cylinder of a screw extruder, conveying the materials to a material feeding section forward through the friction and shearing effects of the inner wall of the material cylinder and the surface of a screw under the screw rotation effect, changing the materials from the powdery
solid into high-
viscosity elastomers gradually through the compression, fusion and homogenization processes, extruding the high-
viscosity elastomers through an opening die on a head of the screw extruder so as to acquire a
pipe consistent with the opening die in shape at the extruding temperature of 110-130 DEG C; (3) cooling, and dragging; and (4) spraying a code,
cutting,
polishing and detecting, wherein the product up to the standard after checking is the polyethylene pipe for
water supply. The extruding and forming method of the polyethylene pipe for water supply, which is provided by the invention, is rapid in extruding speed and is high in production efficiency; the prepared pipe is improved in abrasion resistance, is good in
aging resistance, prolonged in the service life, and low in production cost.