A multi-layered pipe and a method for forming a multi-layered pipe
A barrier layer and internal layer technology, applied in chemical instruments and methods, pipes/pipe joints/fittings, applications, etc., can solve problems such as poor connection, reduce production time, save storage space, and avoid oxidation.
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[0024] In the drawings, the same parts have the same reference numerals. figure 1 A cross-sectional view of a multi-layer pipe 1 is shown schematically, the multilayer pipe 1 comprising a wall with an inner layer 2 of polyolefin and a barrier layer 3 which is an outer layer with respect to the polyolefin layer 2 . The barrier layer 3 is formed of a non-metallic barrier material which has an increased resistance to the diffusion of hydrocarbon molecules therethrough compared to polyolefins. Such hydrocarbon molecules may include relatively small hydrocarbon molecules, and more particularly may include toluene trichloroethylene and p-dichlorobenzene. The tube 1 also comprises a protective layer 4 which is an outer layer 5 with respect to the barrier layer 3 . The protective layer and the barrier layer may be combined together into a single layer. Preferably, the protective layer and the barrier layer are of the same material. As such, no tie layers are required between these ...
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