DE29822212U1 - Sanitary and / or heating installation items - Google Patents

Description

Sanitary and/or heating installation items

The invention relates to a sanitary and/or heating installation article, in particular a pipe or a fitting with a base pipe or pipe section that may be curved and/or has a branch with an outer layer and/or an inner layer made of a polymer material and with a diffusion barrier layer on the outer layer and/or inner layer of the base pipe.

Plastic pipes are increasingly being used in the sanitary and heating sector. It is particularly important when used as heating pipes that these plastic pipes are oxygen-tight. Otherwise, the oxygen diffusing through the pipe wall from the outside can dissolve in the heating water and cause corrosion in the boiler and other metal parts. But a diffusion barrier can also be essential when used as drinking water pipes. This applies, for example, when plastic pipes are used to transport drinking water in contaminated areas.

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To prevent substances from the soil or the environment from diffusing through the pipe wall and affecting the drinking water, they must be permeation-tight.
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In the current state of the art, metal foils or special polymer coatings are used to create diffusion barrier layers in plastic pipes. The problem with metal foils is that these foils can tear due to the different thermal expansions of the plastic material and the metal if the metal foil has a thickness of less than about 150 μιδ, which is generally desirable for reasons of saving material. The polymers used today as barrier layers or diffusion barrier layers (e.g. EVOH) are often very brittle, which can lead to them tearing due to thermal expansion. In addition, these polymer diffusion barrier layers are quite expensive and sometimes have to be considerably thick in order to achieve the desired oxygen or permeation tightness. Up to now, these barrier or diffusion barrier layers have been produced by extrusion onto a plastic base pipe.

The invention is based on the object of creating a plastic-based sanitary and/or heating installation article to which a permanently functional diffusion barrier layer can be applied in a simple manner.

To solve this problem, the invention proposes a sanitary and/or heating installation article of the type mentioned above, in which, according to a first variant, the diffusion barrier layer is

a plasma, whereby SiO-based materials are used as the material for the diffusion barrier layer.

According to the invention, the sanitary and/or heating article (hereinafter referred to as a plastic pipe for the sake of simplicity) is treated in a plasma. The plasma contains SiO-based substances which, as plasma products, are deposited on the surface (outside and/or inside) of the base body of the article (hereinafter referred to as the pipe surface) and form a firm bond with the plastic of these layers. Depending on the application, different types of plasma can be used.

The advantage of a plastic pipe or pipe section, possibly curved and/or with a branch connection, with a diffusion barrier layer applied in a plasma is that it is inexpensive to manufacture and that the diffusion barrier layer adheres well to the relevant plastic layer of the pipe. This diffusion barrier layer can also be easily peeled off if the plastic pipe is to be connected to a welding sleeve, for example. Furthermore, diffusion barrier layers on plastic pipes produced in a plasma on the basis of SiO have extremely good barrier properties against the penetration of oxygen or gas in general.

According to a second variant of the invention, the SiO-based substances used as a diffusion barrier layer are applied in dissolved form as a solution to the base body of the article to be treated, e.g. by dipping or spraying.

An embodiment of the invention is explained in more detail below using the figures. In detail:

Fig. 1 shows a perspective sectional view of a plastic pipe with an external diffusion barrier layer and

Fig. 2 schematically shows the part of an art relating to the application of the diffusion barrier layer

fabric pipe manufacturing plant.

Fig. 1 shows a plastic pipe 10 coated according to the invention. The plastic pipe 10 has a base pipe 12 made of a thermoplastic. This base pipe 12 consists, for example, of a polymer material such as PVC, PP, PE or the like. Alternatively, the base pipe 12 can also be designed as a rubber hose or as a GRP pipe. A SiO-based diffusion barrier layer 14 is applied to the outside of the base pipe 12. This diffusion barrier layer 14 is applied to a plasma chamber 16, for example in continuous operation, with a vacuum in the plasma chamber 16. The base pipe 12 to be coated, coming from the production line or a winding station, continuously passes through the plasma chamber 12, in which it is coated from the outside with the SiO diffusion barrier layer 14. After leaving the plasma chamber 16, the pipe coated in this way is wound up.

It should be noted that the SiO diffusion barrier layer 14 only has a thickness in the nm to μδη range. This means that the tube 10 can certainly be bent,

without any risk of damage to the SiO diffusion barrier layer 14.

The above considerations also apply to, for example, press-fit, screw-fit or welded fittings, curved angle pipe sections or T-pipe sections made of plastic.

Claims (1)

CLAIM Sanitary and/or heating installation article with a possibly curved and/or branched base pipe (12) with an outer layer and/or an inner layer made of a polymer material and a diffusion barrier layer (14) on the outside and/or inside of the base tube (12), characterized, that the diffusion barrier layer (14) comprises a SiO-based material which is applied to the outside and/or inside of the base body (12) by plasma coating, or in dissolved form by spraying and/or by dipping.