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Home : Products : HDPE Process
Most plastic pipe systems are made from thermoplastic materials. The production method is basically the same for all thermoplastics – it is a matter of melting the material, shaping and then cooling. Plastic pipes are normally produced by extrusion, whereas fittings are produced by injection-moulding.
Pipes made from PP, PE and other thermoplastics are usually manufactured by extrusion. The extrusion process starts by feeding plastic material (pellets, granules, flakes or powders) from a hopper into the barrel of the extruder. The material is gradually melted by the mechanical energy generated by turning screws and by heaters arranged along the barrel. The molten polymer is then forced into a die which shapes the polymer into a pipe which hardens during cooling. An haul off unit pulls the pipe and to feed it to cutting machine at the end of production line where the manufacturer is free to decide whether to cut the pipe into lengths of any six, twelve or even fifty metres, etc. Highly flexible pipes can be made even longer when coiled on a reel.
Fittings such as elbows, junctions or T-pieces are usually produced by injection-moulding. In injection-moulding, the plastic material is fed from a hopper into the melting section of the injection-moulding machine. After melting, the material is transported forward by the screw and homogenised before being injected into the mould to form the shape of the desired product. In the cooling step, the plastic solidifies. Then the mould is opened and the product is ejected.