DE202014102643U1 - Multilayer pipe molding - Google Patents

Abstract

Multilayer pipe molding, in particular a multilayer pipe (1) having a wall (1.1) comprising a first layer (1.1.1) containing a polymer material or consisting of a polymer material, the polymer material being selected from a thermoplastic, and one with this bonded second layer (1.1.2) containing a polymer material or consisting of a polymer material, the polymer material being selected from a thermoplastic, characterized in that the polymer material of the second layer (1.1.2) has closed-cell voids and has a density, which is reduced by 5 to 15% relative to the density of the polymer material having no voids, and that the thickness of the second layer (1.1.2) is 5 to 25% of the thickness of the first layer (1.1.1).

Description

The invention relates to a multilayer pipe molding, in particular a multilayer pipe and a Fluidaufnahme-, storage and -Seititsystem with such a multilayer pipe molding.

Pipe moldings, and in particular pipes whose walls contain a polymer material or consist of a polymeric material, are widely used to construct systems for receiving, storing and conducting fluids.

The weight of such pipe fittings and in particular of such pipes is a critical factor in the manufacture, storage, handling, installation and use thereof. There are therefore various approaches in the art to reduce this.

Object of the present invention is therefore to provide an improved pipe molding, in particular a pipe available, which has a reduced weight while maintaining the mechanical properties.

The solution of this task is carried out according to claim 1.

Further advantageous embodiments of the invention are specified in the subclaims.

It has been recognized that a multilayer pipe molding, in particular a multilayer pipe having a wall comprising a first layer containing a polymer material or made of a polymer material, the polymer material being selected from a thermoplastic, and a second layer bonded thereto, which comprises a polymer material or consists of a polymer material, the polymer material being selected from a thermoplastic, solves this object comprehensively, if it is provided that the polymer material of the second layer has closed-cell cavities and has a density which is 5 to 15% higher than that of FIG Density of the polymer material having no voids is reduced, and that the thickness of the second layer is 5 to 25% of the thickness of the first layer.

The multilayer pipe molding, in particular the multilayer pipe of the present invention is advantageously formed at least with a two-layer wall. In the context of the invention it is provided that the second layer has closed-cell cavities, while the first layer consists of a compact material.

Such a tubular molding according to the invention, in particular a multilayer pipe, achieves the above-indicated object by having a reduced weight, the mechanical properties of this measure remaining substantially unimpaired.

The provision according to the invention of an at least two-layered wall, wherein the second layer has closed-cell cavities in the polymer material, reduces the weight of such a multilayer pipe molding, in particular a multilayer pipe, according to the present invention. Essential to the invention here is that the cavities are formed close-celled, since thereby the gas contained in the closed-cell cavities can not or only with difficulty escape from the cavities and in particular no fluid, for example water with time penetrates into the closed-cell cavities and thus repeals their effect and particular would contribute to the weight of the multilayer pipe molding, in particular of the multilayer pipe would increase.

The density of the second layer polymer material having closed cell voids is reduced according to the invention by 5 to 15% over the density of the polymer material having no voids. In a preferred embodiment of the invention, the density is reduced by 8 to 13% and particularly preferably by 10 to 12%.

The thickness of the second layer is according to the invention 5 to 25% of the thickness of the first layer.

In a preferred embodiment of the invention, the thickness of the second layer is 10 to 20% and particularly preferably 12 to 18% of the thickness of the first layer.

As very favorable, a thickness of the second layer of 0.5 to 2.0 mm at a thickness of the first layer of 2.5 to 15 mm has resulted. In this case, there is no significant influence on the mechanical properties of the pipe molding, in particular of the pipe, by the provision of the second layer with the closed-cell cavities in the polymer material.

In the context of the present invention, it has proved to be very advantageous if it is provided that the lumen of the multilayer pipe molding, in particular of the multilayer pipe of the first layer or of the second layer is limited.

It can therefore be provided according to the invention that the first layer, i. H. the layer of compact polymer material delimits the lumen of the multilayer pipe molding, in particular the multilayer pipe, so that the second layer, which has closed-cell cavities in the polymer material, is arranged on the side of the first layer facing away from the lumen. In this way, a multilayer pipe molding, in particular a multilayer pipe is advantageously provided, which has a layer with closed-cell cavities in the polymer material as the outer layer of the wall. Such a multilayer pipe molding according to the invention, when stored outdoors under the influence of solar radiation, heats up much less than a tubular molding of the prior art which has a compact wall of polymer material. Due to the one-sided effect of solar radiation on the tubes a more or less strong longitudinal bend can be caused. This is particularly disadvantageous if the tube-shaped parts, in particular the tubes are supported in certain bearing situations, for example, only at their ends, so that in addition to solar radiation also the weight of the tube acts and thus an even stronger longitudinal bend is caused. Such curved tubes are very difficult to lay in a Plangefälle. As far as the slope to be produced in the pipe installation is very low, this may under certain circumstances lead to so-called. Unterbögen, whereby no uniform slope is present. In these sub-sheets, it can then come to standing fluids that are detrimental to the utility of the pipes, since there deposits occur, adhesions are observed and thereby occur any odors. In extreme cases, such underbeams can lead to backflow of the fluid in the piping system. This can be easily countered by the use of a multilayer pipe molding, in particular a multilayer pipe according to the present invention. By providing the outer layer of the wall, which has closed-cell cavities in the polymer material, the tube heats up much less under the influence of solar radiation, so that the longitudinal bend caused thereby is avoided or at least considerably reduced.

Another advantage of the outer layer of the wall, which has closed-cell voids in the polymer material, is that it has a high resistance to damage due to its flexibility. In particular, in the production, storage, transport, during installation and in the application of the multilayer pipe molding according to the invention, in particular the multi-layer pipe shocks and blunt force effects can be damped so far that there is no damage to the pipe molding.

Also, the risk of crack formation or crack propagation is minimized in these multi-layer tube moldings according to the invention, in particular multi-layered tubes, since the outer layer of the wall, which has closed-cell cavities in the polymer material, effectively prevents the formation of such cracks due to force effects on the surface.

In an alternative embodiment, provision may be made for the multilayer pipe molding, in particular the multilayer pipe, to be formed in such a way that its lumen is delimited by the second layer, which has cell-shaped hollow spaces in the polymer material. The first layer, which is designed as a compact thermoplastic layer, is arranged on the side facing away from the lumen of the second layer. In this way, a multilayer pipe molding, in particular a multilayer pipe is advantageously provided, which has a layer with closed-cell cavities in the polymer material as the innermost layer of the wall. Such a multilayer tubular molding according to the invention is of great advantage when cleaning work is to be carried out on the pipe inner surface.

In this case, by means of so-called chain sling techniques, contaminants, in particular adhesions and incrustations, can be removed in a simple manner from the inner surface of the pipe molding, in particular of the pipe. The innermost layer of the wall with closed-cell cavities in the polymer material has a certain flexibility, which absorbs the force input of the chain links projecting against this layer resiliently and thereby suffers no damage in the form of cracks, flaking or deep abrasions. Moreover, the resilient deformability of the innermost layer favors the removal of buildup and encrustation from the inner surface of the pipe molding in a special way, since they easily flake off from the surface which under the force acting on the chain link minimally deforms.

The provision according to the invention of designing the innermost layer of the wall with closed-cell cavities in the polymer material entails a further advantage which consists in the fact that fluid drained off in particular during severe winters, in particular wastewater, does not freeze and thus due to the insulating effect of the innermost layer for adding the pipe molding, in particular of the pipe tends. In this way, a large-sized pipe system can be constructed, without or at least with a reduced risk that it will lead to a freezing of the conducted fluid.

In a further embodiment of the present invention, it is very advantageously provided that the lumen of the multilayer pipe molding, in particular the lumen of the multilayer pipe, is delimited by the second layer which has closed-cell cavities in the polymer material. At the opposite side of the lumen of the second layer, the first layer of compact thermoplastic material is arranged. At its opposite side of the lumen, in turn, another layer, which has closed-cell cavities arranged. The further layer, which has closed-cell cavities, is connected to the first layer.

In this way, there is provided a multi-layered tube molding, in particular a multi-layered tube having a three-layered wall structure, wherein the innermost lumen-limiting layer comprises a closed-cell polymeric material and the outermost layer is also formed by a closed-cell polymeric material is. In this multi-layer pipe molding, in particular a multi-layer pipe of the present invention, the advantages mentioned above are cumulative, since both the advantage of the layer with the closed-cell cavities on the outside, as well as the advantages of the layer with the closed-cell cavities as innermost layer of the pipe molding usable are.

Within the scope of the present invention, it is possible that the closed cell cellular material of the second layer and the closed cell polymeric material of the layer are identical or different. When the two closed-cell polymer materials for the second layer and the layer are identical, a very simple manufacturing technique is applicable thereto. For this purpose, the polymer material with closed-cell cavities can be used both for the formation of the second layer and for the formation of the layer.

If the two closed-cell polymer materials are different for the second layer and for the layer, then two different closed-cell polymer materials must be provided accordingly. In this case, the respective polymer material with the closed-cell cavities can be selected exactly according to the requirements and provided for the production of the molded part.

It is also within the scope of the present invention that further layers are present, which are arranged between the layers described above or also on or on one of the layers described above.

In the present invention, it has proven to be particularly favorable when the polymer material is selected from a thermoplastic, preferably from a polyolefin and more preferably from a polypropylene, from a polyethylene which is uncrosslinked or crosslinked, from a polybutene or from a copolymer or blend the aforementioned.

Thermoplastics are easy to process by bringing them to a temperature in which they are malleable, whereby the multilayer pipe molding, in particular the multilayer pipe is formed with appropriate tools. In particular, polyolefins are very well suited for this purpose, since they are inert, hygienic, durable, durable and resistant, easy to mold and inexpensive.

Multilayer pipe parts and in particular multilayer pipes can be produced from polyolefins in a simple manner. Polyolefins are the materials of choice for this purpose.

In the present invention, it is possible in a simple manner to form the closed cell in the polymer material of the second layer and the layer by a physical and / or chemical foaming process. For this purpose, the polymer material in which the closed-cell cavities are to be formed is mixed with agents which expand when the temperature increases or when the pressure is reduced, or which initiate a chemical reaction when the temperature increases, during which gases are formed which form the closed-cell cavities in the polymer material.

Here in particular expandable microspheres, such as Expancel, can be used or supercritical gases, such as carbon dioxide, or other gases, such as nitrogen, are added to the polymer material. Other possibilities are to add compositions, such as sodium bicarbonate and citric acid, to the polymer material, from which carbon dioxide and water vapor are then formed at elevated temperature, leading to foaming in the polymeric material.

In a very favorable manner, it can be provided in the present invention that an adhesion promoter layer is arranged between the first and the second layer and / or between the first layer and the layer.

Using a primer layer, which in turn has only a very small thickness of <1 micron (micrometers) to a few microns (microns) can their tailor-made composition causes the adhesion between different layers containing polymeric material or made of polymeric materials to be improved.

By using an adhesion promoter, a multilayer pipe molding, in particular a multilayer pipe, can be provided, which has improved adhesion between different layers of the wall, resulting in improved mechanical behavior of the pipe molding.

In one development of the present invention, provision can be made for a protective layer to be present which contains a thermoplastic polymer material or consists of a thermoplastic polymer material. This protective layer can be provided as the outermost layer on the multi-layer tubular molding, in particular multi-layered pipe and protect it from any damage during manufacture, during storage, during transport, during installation and during use. As the polymer material may be selected one, as already mentioned above, in particular a thermoplastic, and here particularly preferably a polyolefin.

In a further very favorable development of the present invention can be provided that the multilayer pipe molding, in particular the multilayer pipe is formed such that at least one diffusion barrier is disposed on a layer or in a layer of the wall. A diffusion barrier layer in the present context of the invention may be a metal layer and / or a polymer material layer. In this case, layers of aluminum, which are in the form of a thin film or a vapor-deposited metal layer, have proven particularly useful. Ethylene vinyl alcohol layers or layers of a thermoplastic material to which phyllosilicates have been added, and others have proven more suitable as polymer material. Such a diffusion barrier layer can be arranged on a layer of the wall or in a layer of the wall. A diffusion barrier layer according to the present description is suitable for preventing or at least considerably reducing the passage of substances through the wall of the multilayer pipe molding, in particular of the multilayer pipe. This can be provided both that substances from the lumen of the multilayer pipe molding, in particular the multilayer pipe or not significantly reduced in the outside world or that substances from the outside world through the wall into the lumen of the multilayer pipe molding, in particular of the multilayer Pipe transgress.

In the context of the present invention, a pipe molding comprises a pipe, a pipe bend, a pipe branch, a T-piece, a Y-piece, a reducer, a coupling sleeve, a blind socket, a blind plug, a compensation piece and a pipe cleaning molding.

Pipes and pipe bends can be easily produced by means of coextrusion, in which the various layers of the wall are easily formed from the appropriate polymer materials by tools.

T-pieces, Y-pieces, reducers and other pipe fittings are accessible by multi-component injection molding in which, in successive injection molding processes, the individual layers of the wall are formed in corresponding tool cavities.

The object of the present invention to provide a fluid intake, storage and control system, learns their solution in claim 10th

In the context of the present invention, it has been recognized that a fluid intake, storage and supply system can be configured very advantageously if it comprises at least one multilayer pipe molding, in particular a multilayer pipe, as described above.

In this case, the advantages in the fluid intake, storage and control system can be used, which are already described above. Such a fluid intake, storage and delivery system is therefore substantially improved over that with tube moldings known in the art.

The present invention finds application in sewer systems, particularly in sewer systems, in industrial sewer systems, in agriculture, in fish farming, in swimming pools, slaughterhouses, in the food industry, in the beverage industry and in other fields.

Other important features and advantages of the invention will become apparent from the dependent claims, from the Fig. And from the accompanying figure description.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the figures and are shown in FIG following description, wherein like reference numerals refer to identical or functionally identical or similar components.

The present invention will be explained in more detail with reference to the attached figures as follows.

This shows:

1 a perspective view, partially in section, of a pipe molding according to the invention in a first embodiment;

2 a perspective view, which is partially cut, a pipe molding according to the invention in a second embodiment.

In 1 is a pipe-shaped part in a perspective, partially sectioned view 1 of the present invention in a first embodiment. The pipe molding 1 is shown in the form of a pipe section.

The lumen 1.2 of the pipe molding 1 is from the first layer 1.1.1 the wall 1.1 of the pipe molding 2 limited. The layer 1.1.1 Contains polypropylene in the present embodiment. In the shift 1.1.1 are no cavities arranged, the layer 1.1.1 is compact. At the lumen 1.2 of the pipe molding 1 opposite side of the first layer 1.1.1 is the second layer 1.1.2 arranged. The second layer 1.1.2 the wall 1.1 of the pipe molding 1 contains polypropylene, which has closed-cell cavities.

The thickness of the second layer 1.1.2 , which is not reproduced to scale, is about 10% of the thickness of the first layer 1.1.1 the wall 1.1 of the pipe molding 1 , The pipe molding 1 , here present in the form of a pipe section has approximately a uniform layer thickness of the first layer along its entire circumference 1.1.1 and the second layer 1.1.2 on.

The first shift 1.1.1 and the second layer 1.1.2 the wall 1.1 of the pipe molding 1 are firmly connected.

The formed in the form of a pipe section pipe fitting 1 out 1 According to the present invention is produced in a coextrusion process.

In 2 is a perspective, partially sectioned view of an inventive pipe molding 1 in a second embodiment. The pipe molding 1 is in the 2 shown as a pipe section.

The lumen 1.2 of the pipe section is from the second layer 1.1.2 limited. The second layer 1.1.2 Contains polypropylene in the present embodiment, which has closed-cell cavities. On the outer surface of the second layer 1.1.2 the wall 1.1 of the pipe molding 1 is in a thin layer of a few microns (microns) an adhesive layer 1.1.3 arranged.

On this primer layer 1.1.3 is the first layer 1.1.1 the wall 1.1 of the pipe molding 1 arranged. The first shift 1.1.1 Contains polypropylene in the present embodiment, which has no cavities, but is compact.

On the outer surface of the first layer 1.1.1 again is a primer layer 1.1.3 applied in a thickness of a few microns (microns), on which another layer 1.1.4 is arranged. The layer 1.1.4 is in the present embodiment, a layer containing polypropylene, which has closed-cell cavities.

The second layer 1.1.2 , the first layer 1.1.1 and the layer 1.1.4 are firmly connected and form the wall 1.1 of the pipe molding according to the invention 1 ,

The thicknesses of the individual layers 1.1.2 . 1.1.1 and 1.1.4 are not to scale in the 2 played. The thickness of the second layer 1.1.2 and the thickness of the layer 1.1.4 not shown to scale, is about 10% of the thickness of the first layer 1.1.1 the wall 1.1 of the pipe molding 1 ,

The pipe molding 1 , here present in the form of a pipe section has approximately a uniform layer thickness of the second layer along its entire circumference 1.1.2 , the first layer 1.1.1 and the layer 1.1.4 on.

In the 2 is still a protective layer 1.3 shown on the outer surface of the layer 1.1.4 is arranged and firmly connected to this. The protective layer 1.3 is only in a section of the pipe molding according to the invention 1 shown as an example. It is understood that in a real embodiment of the pipe molding according to the invention 1 with such a protective layer 1.3 the protective layer 1.3 on the entire outer surface of the layer 1.1.4 is arranged.

The formed in the form of a pipe section pipe fitting 1 out 2 According to the present invention is produced in a coextrusion process.

What with the present 1 and 2 based on a pipe section for the pipe molding according to the invention 1 is equally applicable to moldings such as elbows, pipe branches, T-pieces, Y-pieces, reducers, coupling sleeves, blind sleeves, blind plugs, shims and pipe cleaning moldings to.

LIST OF REFERENCE NUMBERS

1

Multilayer pipe

1.1

wall

1.1.1

first shift

1.1.2

second layer

1.1.3

Bonding layer

1.1.4

layer

1.2

lumen

1.3

protective layer

Claims (10)

Multilayer pipe molding, in particular multilayer pipe ( 1 ) with a wall ( 1.1 ), which is a first layer ( 1.1.1 ) comprising a polymer material or consisting of a polymer material, wherein the polymer material is selected from a thermoplastic, and a second layer ( 1.1.2 ) comprising a polymer material or consisting of a polymer material, the polymer material being selected from a thermoplastic, characterized in that the polymer material of the second layer ( 1.1.2 ) has closed-cell voids and has a density reduced by 5 to 15% relative to the density of the polymer material having no voids, and that the thickness of the second layer ( 1.1.2 ) 5 to 25% of the thickness of the first layer ( 1.1.1 ) is. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to claim 1, characterized in that its lumen ( 1.2 ) from the first layer ( 1.1.1 ) or from the second layer ( 1.1.2 ) is limited. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to claim 1 or 2, characterized in that its lumen ( 1.2 ) of the second layer ( 1.1.2 ) and that at the lumen ( 1.2 ) facing away from the first layer ( 1.1.1 ) a layer ( 1.1.4 ) having closed-cell cavities arranged with the first layer ( 1.1.1 ) connected is. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to claim 3, characterized in that the polymer material with closed-cell cavities of the second layer ( 1.1.2 ) and the closed-cell polymer material of the layer ( 1.1.4 ) are identical or different. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to one of the preceding claims, characterized in that the polymer material is selected from a thermoplastic, preferably from a polyolefin and more preferably from a polypropylene, from a polyethylene which is uncrosslinked or crosslinked, from a polybutene, or from a copolymer or blend the aforementioned. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to one of the preceding claims, characterized in that the closed-cell cavities in the polymer material of the second layer ( 1.1.2 ) and the layer ( 1.1.4 ) are formed by a physical and / or chemical foaming process. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to one of the preceding claims, characterized in that between the first ( 1.1.1 ) and the second layer ( 1.1.2 ) and / or between the first layer ( 1.1.1 ) and the layer ( 1.1.4 ) a primer layer ( 1.1.3 ) is arranged. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to one of the preceding claims, characterized in that a protective layer ( 1.3 ) containing a thermoplastic polymer material or made of a thermoplastic polymer material is disposed as the outermost layer. Multilayer pipe molding, in particular multilayer pipe ( 1 ) according to one of the preceding claims, characterized in that at least one diffusion barrier layer is disposed on a layer or in a layer. Fluid receiving, storage and -Seititsystem with at least one multilayer pipe molding, in particular multi-layer pipe ( 1 ) according to one of claims 1 to 9.

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