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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.

Inactive Publication Date: 2019-02-05
WAVIN BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the molten components are different, the connection will be poor, possibly resulting in a weaker point in or at the joint (when not causing the connection to fail)

Method used

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  • A multi-layered pipe and a method for forming a multi-layered pipe
  • A multi-layered pipe and a method for forming a multi-layered pipe
  • A multi-layered pipe and a method for forming a multi-layered pipe

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Embodiment Construction

[0024] In the figures, the same components have the same reference numerals. figure 1 A cross-sectional view of a multilayer pipe 1 is schematically represented, comprising a wall with an inner layer 2 of polyolefin and a barrier layer 3 which is an outer layer relative to the layer 2 of polyolefin. The barrier layer 3 is formed of a non-metallic barrier material which has an increased resistance to the diffusion of hydrocarbon molecules through compared to polyolefins. Such hydrocarbon molecules may include relatively small hydrocarbon molecules, and more particularly may include toluenetrichloroethylene and p-dichlorobenzene. The pipe 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 can be combined together into a single layer. Preferably the protective layer and barrier layer are of the same material. Thus, no tie layers are required between these layers. These two layers can...

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Abstract

A multi-layered pipe comprises a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallicbarrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being anouter layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion. The protective layer and the barrier layer may together be incorporated in a single layer.

Description

technical field [0001] The invention relates to a multilayer pipe and a method for its manufacture. In particular, the invention relates to a multilayer pipe for transporting drinking water. Background technique [0002] Such pipes may need to be laid on contaminated ground (e.g. contaminated with oil, coal tar, petroleum etc., ie to such an extent that the ground does not need to be cleaned). For this case, it is necessary to prevent hydrocarbon molecules from entering the feed water through the pipe wall. [0003] EP0638749A1 proposes the use of a barrier layer in the pipe wall made of a polymer which has a very low permeability to hydrocarbons and gases. The barrier layer is provided as an outer layer, on an inner layer of polyolefin. One or both of these layers are disclosed as having binder polymer units of unsaturated epoxy or acyl compounds included in the layers, at least in the interface region between the layers middle. The concentration of the binder polymer ...

Claims

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Application Information

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IPC IPC(8): B32B7/06B32B27/08B32B27/30B32B27/32B32B27/34B32B27/36B32B1/08F16L9/12F16L11/04
CPCB32B7/06B32B27/08B32B27/304B32B27/32B32B27/34B32B27/36B32B27/365F16L9/123F16L11/045B32B2250/24B32B2307/7242B32B2307/748B32B2597/00F16L2011/047B32B1/08
Inventor M·P·克莱默Y·S·德施姆克M·格里斯J·阿克曼
Owner WAVIN BV
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