WO2020136031A1 - Method for producing a fluid conduit, and corresponding fluid conduit - Google Patents

Abstract

The invention relates to a method for producing a fluid conduit (1) having a main body comprising at least one plastics layer (5, 6, 7, 8). According to the invention, a chafe layer (9) consisting of a thermoplastic polyurethane is applied to the main body by extrusion. The invention also relates to a fluid conduit (1).

Description

DESCRIPTION

Method for producing a fluid line and corresponding fluid line

The invention relates to a method for producing a fluid line which has a base body with at least one layer consisting of plastic. The invention further relates to a fluid line.

For example, the document DE 20 2011 109 257 U1 is known from the prior art. This describes an arrangement with at least one bent flexible media line, at least one means for shape stabilization being provided to prevent a bending shape entered into the flexible media line from being reshaped, the means for shape stabilization taking shape during the bending shaping or after the bending shaping of the media line and maintains through energy transfer.

It is an object of the invention to propose a method for producing a fluid line which has advantages over known methods, in particular serves to produce a fluid line which is particularly protected against external influences.

This is achieved according to the invention with a method for producing a fluid line with the features of claim 1. It is provided that an abrasion-resistant layer made of thermoplastic polyurethane is applied to the base body by extrusion.

The fluid line is used to transport a fluid, in particular a liquid or gaseous fluid. The fluid line is used, for example, in the motor vehicle sector and can accordingly represent a component of a motor vehicle. Preferably, the fluid line serves as a fuel line and thus the supply of fuel to a drive unit of the motor vehicle. However, the fluid line is basically universally applicable. For example, it can also be in the form of a vacuum line, in particular a brake vacuum line, a BlowBy line, a hydraulic line, a cooling water line, a crankcase ventilation line or an activated carbon filter regeneration line.

The fluid line has the base body, which in turn has the at least one layer. The base body can be configured in one layer and in this respect only one Have layer. Alternatively, the base body is multi-layered and accordingly has several layers. The layer or layers consist of plastic. If there are several layers, at least one of the layers consists of plastic, but preferably several or even all. The plastic can basically be chosen arbitrarily.

The fluid line is often used in a space in which there may be a contact of the fluid line with another component. This is particularly the case if the fluid line is used in an engine compartment of a motor vehicle. The installation space in such an engine compartment is becoming ever narrower due to the increasing complexity of the units in combination with higher safety and comfort requirements. This applies in particular to fluid lines, which often have to be arranged around changing components in the course of an increasing variety of motor vehicles. The usual design guidelines for such fluid lines, which provide all-round minimum clearance to neighboring elements due to component, contour and installation tolerances and last but not least to compensate for movements of the motor vehicle and deformations due to thermal expansion and / or expansion due to internal pressures, can not be partially more adhered to.

This means that contact points of the fluid line to one or more components must be expected. Thus there is a static or dynamic contact of the fluid line with the component. However, this must not lead to the fluid line becoming leaky or even bursting due to abrasion or other damage over the life of the motor vehicle. Thus, concrete measures for abrasion protection are to be taken for the fluid line. For example, it can be provided that an abrasion protection element is arranged on the base body in a form-fitting and / or force-fitting manner. However, this is expensive because, on the one hand, the abrasion protection element is manufactured separately from the fluid line and, on the other hand, must be subsequently arranged on it.

For this reason, it is provided according to the invention that the abrasion protection layer is applied to the base body by extrusion. This means that the abrasion protection layer is firmly bonded to the base body or the outer layer of the base body. For example, extrusion or coextrusion can be used as extrusion. The abrasion-resistant layer is extruded onto the base body after the base body has been formed. The base body is therefore first produced or formed, preferably also by extrusion. Then will the scouring protective layer is extruded onto the already formed, in particular extruded, base body. The abrasion-resistant layer has, for example, a layer thickness of at least 0.1 mm to at most 0.5 mm. It is preferably at least 0.3 mm to at most 0.5 mm.

Particularly preferably, the abrasion-resistant layer is formed simultaneously with the base body and is integrally connected to it. For this purpose, coextrusion is used in particular, in which both the base body and the abrasion protection layer are simultaneously formed by extrusion and attached to one another. The abrasion-resistant layer is extruded, for example, using a cross-head extruder, in particular a three-zone single-screw extruder. The extruder preferably has a compression ratio of at least 2.5 and / or an L: D ratio of at least 20 to at most 40, in particular from at least 25 to at most 30. The extruder is preferably designed to be streamlined to prevent thermal damage to avoid the material, namely the polyurethane, in dead zones.

The abrasion-resistant layer consists of the thermoplastic polyurethane. The thermoplastic polyurethane belongs to the product class of thermoplastic elastomers (TPE). It can be used in cross-linked or non-cross-linked form. The properties of the polyurethane can be varied depending on the application. Depending on the degree of crosslinking and / or the isocyanate or OH component used, a thermoset, a thermoplastic, an elastomer or a thermoplastic elastomer is obtained. The thermoplastic polyurethane, which can also be referred to as TPU or TPE-U, is a thermoplastic elastomer, i.e. a plastic that is comparable to the classic elastomers at room temperature, but can be plastically deformed when heat is applied and thus exhibits thermoplastic behavior. This is particularly important for processing.

The thermoplastic polyurethane can be extruded, injection molded or blow molded. It is a block polymer, which means that the hard segments and the soft segments in a molecule are sharply separated. The thermoplastic polyurethane can be adjusted to good hydrolysis properties, mineral oil resistance, heat resistance, low temperature flexibility, UV and / or ozone stability and / or strength. The modulus of elasticity of the thermoplastic polyurethane is preferably set such that it lies between elastomers and polyamides. The hardness is preferably set in a range from 60 Shore (A) to 95 Shore (A). This means that the fluid line can be thermoformed with low reset behavior. ten achievable. The glass transition temperature of the polyurethane is preferably between -30 ° C and -40 ° C. Adequate cold flexibility of the fluid line is hereby achieved.

The thermoplastic polyurethane particularly preferably has a vibration-damping effect, which has a positive effect on the acoustics of the fluid line during a flow through the fluid. The polyurethane also has high cold impact resistance. The heat resistance as well as the continuous use temperature can be set within a wide range. The chemical resistance to media used in the automotive sector and to road salt is good. The abrasion resistance of the thermoplastic polyurethane is particularly preferably further improved by adding an EVA-based masterbatch, the metering being particularly preferably between 1% and 10%. Furthermore, it can be provided to reduce a coefficient of friction of the surface of the thermoplastic polyurethane by means of at least one polymer-based additive.

The abrasion resistance of the fluid line can be further improved by forming a surface structure on the abrasion protection layer. For this purpose, longitudinal strips are formed, for example, during extrusion or by extrusion on the abrasion protection layer, which extend with respect to a longitudinal central axis of the fluid line in the axial direction, in particular extend continuously. Additionally or alternatively, transverse stripes or a cross structure of longitudinal stripes and transverse stripes can be formed on the abrasion-resistant layer. It is preferably provided that the thermoplastic polyurethane is supplied in the form of a granulate during extrusion. A lubricant can be added to the granulate to improve the extrudability. Of course, it is also possible to color the thermoplastic polyurethane before application. For this purpose, the granulate is colored, for example, or a color batch is added to the granulate.

To further increase safety, it can be provided that the abrasion protection layer is provided with a flame protection layer. The flame protection layer is preferably present on the side of the abrasion protection layer facing away from the base body, so that the flame protection layer represents an outer layer of the fluid line. Additionally or alternatively, it can advantageously be provided to arrange a metal layer between the base body and the abrasion protection layer, and / or to provide the fluid line with at least one heating conductor. The metal layer serves, for example, to increase the flame resistance of the fluid line. The metal layer has, for example, a metal braid or a metal foil which is arranged between the base body and the abrasion protection layer. The metal layer can be applied to the base body before extrusion or during extrusion. After extrusion, the metal layer is reliably held on the base body by the abrasion protection layer.

Additionally or alternatively, the heating conductor can be present on or in the fluid line. For example, the heating conductor is embedded in the base body or is present between the base body and the abrasion-resistant layer. The heating conductor is used to heat the fluid line with electrical energy. To this extent, an electrical heater is integrated in the fluid line. For example, such a solidification of the fluid in the fluid line can be prevented or a solidified fluid can be thawed again. While it can of course be provided that the heating conductor can be attached to the device after the formation of the fluid line, this is complex and costly due to the manual work required for this. For this reason, the heating conductor is preferably applied to the base body when the abrasion protection layer is extruded. For example, the heating conductor is fed helically in a helical line. The helical shape ensures good flexibility of the fluid line even after cutting and extruding the abrasion protection layer.

It is also possible for the abrasion protection layer to have a plurality of sublayers and for the heating conductor to be arranged or embedded between two of these sublayers. Last but not least, it is possible to use an uninsulated heating conductor because the thermoplastic polyurethane has a sufficiently good electrical insulation effect. For example, several heating conductors, in particular uninsulated heating conductors, spaced apart from one another, in particular spaced apart in parallel, can be used. It is also possible to integrate the heating conductor in the metal layer in order to achieve an improved heat distribution. For example, the at least one heating conductor is embedded in the metal mesh, which is placed on the base body. Then the abrasion protection layer is applied to the base body, which so far encloses the metal layer and the heating conductor.

With the help of the metal braid, a safe spacing of several heating conductors can be achieved. For this purpose, for example, the mesh has pores with a specific pore size. The pores allow local adhesion between the thermoplastic polyurethane and the base pipe. Instead of the metal braid, a textile braid can also be used, which is preferably electrically insulating. In this case, the at least one heating conductor can in turn be used without insulation. It can also be provided that the at least one Heating conductor consists of an electrically conductive textile thread. Provision can also be made to use a stripping auxiliary material at cut-off points of the fluid line. It is also conceivable to provide a connection point of the heating conductor at the cut-off points, in particular by laying the heating conductor in a loop, so that an excess area of the heating conductor is available for producing a contact point. In principle, any electrical conductor can be used instead of the heating conductor. Such can serve, for example, to sense a connection of the fluid line to other devices and / or a leak.

The thermoplastic polyurethane used for the abrasion protection layer has, for example, a density of at least 1.15 g / cm to at most 1.6 g / cm, in particular from at least 1.20 g / cm to at most 1.30 g / cm. Additionally or alternatively, the polyurethane has a Shore A hardness of at least 85 to at most 98. Additionally or alternatively, a tensile strength of at least 26 to a maximum of 40 MPa is provided. The abrasion is particularly preferably at least 35 mm to 90 mm. Elastollan®, for example, which is sold in different types by BASF, can be used as the polyurethane.

The described method for producing the fluid line leads to an integrated configuration of the base body with the abrasion protection layer, through which a particularly high abrasion resistance of the fluid line is achieved.

For example, the base body has a first layer made of a fluoropolymer, a second layer made of a polyamide immediately following the first layer and a third layer immediately following the second layer. The layers mentioned follow each other directly in cash, so that the second layer lies directly on the first layer and the third layer lies directly on the second layer. In other words, the second layer is arranged between the first layer and the third layer and bears on the one hand on the first layer and on the other hand on the third layer. The first layer and / or the second layer and / or the third layer are each individually designed to be of the same material, so that the respective layer consists entirely and consistently of the material designated in each case.

The first layer of the fluid line can consist at least partially, but preferably completely, of the fluoropolymer. A fluorinated polymer is understood to mean a fluorinated polymer. It is characterized by high resistance to chemicals and high temperatures. temperature, in other words by high chemical resistance and / or high temperature resistance. The fluoropolymer can in principle be of any design. For example, it is in the form of ethylene-tetrafluoroethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polychlorotrifluoroethylene (PCTFE) or ethylene-tetrafluoroethylene-hexafluoropropylene (EFEP). However, it should be noted that the first layer can also consist of a different material.

The second layer consists of polyamide, for example PA6, PA612, PA6 / 66, PA616 or a partially aromatic polyamide. The partially aromatic polyamide is to be understood as a partially crystalline aromatic polyamide, which can also be referred to as polyphthalamide (PPA). The polyamide can be reinforced to improve its mechanical strength and, for this purpose, have an additive or a fiber reinforcement. For example, ground glass or ground silicon dioxide is used as an additive. The fiber reinforcement is in the form of a glass fiber reinforcement, a carbon fiber reinforcement or an aremid fiber reinforcement, for example. However, the second layer or the polyamide can also be designed without reinforcement.

The third layer consists, for example, of a polyamide, in particular an aliphatic polyamide, or of an ethylene-vinyl alcohol copolymer (also referred to as EVOH or EVAL). The polyamide is again, for example, PA6, PA66, PA612, PA6 / 66, PA616 or PPA. The ethylene-vinyl alcohol copolymer is to be understood as a copolymer which is formally composed of the monomers ethylene and vinyl alcohol. The ethylene-vinyl alcohol copolymer is an inexpensive barrier material with a good barrier effect against volatile organic compounds. The aliphatic polyamide has a monomer which is derived from aliphatic base bodies, for example from a lactam, in particular an epsilon caprolactam, or from hexamethylene diamine and adipic acid.

It can be provided that the base body consists exclusively of the three layers mentioned, so that the first layer is present as an inner layer and the third layer as an outer layer. In this case, the first layer is used to guide a fluid in the fluid line, making use of the excellent resistance of the fluoropolymer. The fluid line described, consisting of the three layers, has excellent strength properties and high resistance. However, it can also be provided to slam at least one additional layer of the fluid line in addition to the three layers already mentioned. However, the first layer always represents the inner layer. The first layer follows always on the second layer and the third layer, the second layer directly adjacent to the first layer and the third layer directly adjacent to the second layer.

A further embodiment of the invention provides that the abrasion protection layer is applied to an outer layer of the base body, which consists of polyamide, polypropylene or polyphthalamide. For example, the base body consists entirely of one of these materials or at least has one of these materials. If the base body has a multilayer structure, the outermost layer forms the outer layer. Such a configuration of the fluid line is particularly resistant to external influences.

Another embodiment of the invention provides that the base body is cooled before and / or during extrusion and / or the fluid line after application. The cooling of the base body ensures that a change in the shape of the base body is largely or even completely avoided during the extrusion of the abrasion protection layer. This enables a particularly high degree of dimensional accuracy of the fluid line to be achieved.

A further development of the invention provides that during the extrusion, the thermoplastic polyurethane is alternately applied to the base body with another substance. The alternation between the polyurethane and the other substance is preferably carried out in the longitudinal direction of the fluid line, ie in the axial direction with respect to a longitudinal central axis of the fluid line. The other material is selected, for example, in such a way that it is easier to remove from the base body than the polyurethane. In particular, a rubber-containing substance is used as another substance. This can have the same color as the polyurethane or a different color. The other substance can be chosen such that it is washable or can be detached from the base body by mechanical, thermal or chemical treatment. By alternating the application of the polyurethane and the other substance, stripping the fluid line and thus installing the fluid line are significantly simplified.

A preferred further embodiment of the invention provides that an adhesion promoter is applied between the thermoplastic polyurethane and the base body, in particular only in some areas. The adhesion promoter serves for better adhesion of the polyurethane to the base body. The adhesion promoter can be omitted in some areas, so that there are alternating areas with adhesion promoter and without adhesion promoter on the fluid line. These areas preferably alternate in the axial direction with respect to the longitudinal central axis of the fluid line. In this way, a simple stripping of the fluid line is again realized. A preferred further embodiment of the invention provides that the fluid line is subjected to a thermal aftertreatment after the abrasion-resistant layer has been applied, and / or that a crosslinking accelerator is added to the thermoplastic polyurethane before the application. After the abrasion protection layer has been formed on the base body, there will be a subsequent injury to the polyurethane over time. Here the hardness, tear resistance and wear resistance increase further. However, any residual adhesive tendency decreases. This rewetting is a temporal process that also takes place under normal storage conditions, but can be accelerated with higher temperatures.

For this reason, the fluid line is subjected to the thermal aftertreatment, especially shortly after the extrusion. As part of the thermal aftertreatment, the fluid line is heated, for example, to at least 100 ° C. to at most 180 ° C., preferably to at least 150 ° C. to at most 170 ° C. Additionally or alternatively, the crosslinking accelerator which accelerates the postcrosslinking described can be added to the polyurethane. Additionally or alternatively, the fluid line can be subjected to a treatment with UV radiation. As part of the rewetting, the abrasion-resistant layer may shrink, which further improves the mechanical connection to the base body.

A preferred embodiment of the invention provides that the abrasion protection layer is formed from a plurality of sub-layers, the sub-layers consisting of different materials. This has already been pointed out above. The partial layers preferably each consist of polyurethane, in particular of different polyurethanes. This can in particular simplify the introduction of the heating conductor and / or the metal layer.

A further development of the invention provides that the abrasion protection layer is at least partially formed with air pockets. The air inclusions reduce the thermal conductivity of the abrasion protection layer, so that overall good thermal insulation of the fluid line is achieved. The air pockets are formed, for example, if the fluid line is designed as a coolant line or as a fuel line. The thermoplastic polyurethane preferably already has a very low thermal conductivity in the range of at most 0.19 W / (mK) to at most 0.25 W / (mK). This conductivity is further reduced by the air pockets. For example, the air pockets are distributed stochastically in the polyurethane. This can be achieved, for example, by foaming the polyurethane. The foaming is preferably carried out during the extrusion of the abrasion protection layer. It can be provided in a further embodiment of the invention that the base body is provided with a surface structure before application. The surface structure is, for example, a corrugated structure, so that the base body is present as the selected fluid line. The wave-like structure of the base body is in the axial direction with respect to the longitudinal central axis of the fluid line, so that areas with a larger diameter alternate with areas with a smaller diameter in the axial direction. Other surface structures can of course also be realized. The formation of the surface structure improves the adherence of the abrasion protection layer to the base body. On the other hand, the fluid line can be provided with improved bending properties.

A further embodiment of the invention provides that an additional layer is arranged between the base body and the abrasion protection layer and / or in the abrasion protection layer, in particular during extrusion. The additional layer serves, for example, to improve abrasion protection and / or flame resistance. In addition, a thermal conductivity of the fluid line can be improved and / or an electrical resistance can be reduced using the additional layer. For example, the additional layer ensures a uniform temperature distribution when the fluid line is heated by means of a heating device, in particular a heating conductor, especially if the additional layer is in the form of a metal layer. The heat conductor can be integrated into the additional layer or connected to it in a heat-conducting manner, in particular be in contact with it. The additional layer is preferably applied during the extrusion of the abrasion protective layer. For example, it is applied to the base body during the extrusion and coated with the abrasion protection layer by the extrusion. To this extent, the abrasion protection layer preferably completely covers the additional layer.

It can also be provided that the additional layer is integrated into the abrasion protection layer. In this case, the abrasion protection layer is formed during the extrusion and the additional layer is arranged in such a way that the additional layer is subsequently held at a distance from the base body by the abrasion protection layer and is covered by it. The additional layer consists, for example, of at least one of the metals mentioned below or at least has this: aluminum, copper, iron, steel and tin. In this respect, the additional layer can also be referred to as a metal layer. The additional layer preferably consists of only one of the metals mentioned or has this. However, it can also have or consist of several of the metals. The additional layer can only be made from the tall exist. In addition or as an alternative to the metal, however, the additional layer can also contain or consist of another material, a plastic or the like being used as the other material. The other material can be a textile material, that is to say in particular it can consist of at least one natural fiber and / or at least one chemical fiber.

A further development of the invention provides that a film or a flat structure, in particular a woven fabric, knitted fabric, knitted fabric or braid, is used as the additional layer. The additive layer can advantageously be designed in different ways. For example, it is in the form of a film and is therefore designed to be continuous. This results in a particularly good thermal conductivity and a particularly low electrical resistance of the fluid line. However, the film leads to a comparatively rigid fluid line. It can be provided here that instead of the film, the flat structure or textile flat structure is used which consists of metal and / or the other material or at least has this. With regard to the material of the additional layer, reference is made to the further statements in the context of this description.

The invention further relates to a fluid line, in particular manufactured in accordance with the process according to the statements in the context of this description, which has a base body with at least one layer consisting of base material. It is provided that an abrasion-resistant layer of thermoplastic polyurethane is applied to the base body by extrusion.

The advantages of such a configuration of the fluid line or such a procedure have already been pointed out. Both the fluid line and the method for producing it can be further developed in accordance with the statements in the context of this description, so that reference is made to this extent.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing, without the invention being restricted. It shows:

FIG. 1 shows a schematic sectional illustration through a fluid line,

FIG. 2 shows a schematic sectional view through the fluid line in FIG

a first embodiment, Figure 3 is a schematic longitudinal sectional view of the fluid line in a

second embodiment, as well

Figure 4 is a schematic longitudinal sectional view of the fluid line in a

third embodiment.

Figure 1 shows a schematic representation of a fluid line 1, which consists of a multilayer composite 2. The multi-layer composite 2 encompasses a longitudinal central axis 4 of the fluid line 1 in the circumferential direction completely to form a fluid flow space 3 of the fluid line 1. Seen in cross section, the multilayer composite 2 consists of a first layer

5, a second layer 6, a third layer 7 and a fourth layer 8. The layers 5,

6, 7 and 8 form a base body of the fluid line 1. An abrasion protection layer 9 is applied to the base body. Each of the layers 5, 6, 7 and 8 is formed continuously in the circumferential direction and preferably has a constant wall thickness in the circumferential direction. This can also apply to the abrasion protection layer 9.

In the exemplary embodiment shown here, the first layer 5 consists of a fluoropolymer, the second layer 6 of a polyamide, the third layer 7 of an ethylene-vinyl alcohol copolymer and the fourth layer 8 in turn of a polyamide. In principle, the wall thicknesses of the layers 5, 6, 7 and 8 shown here can be identical. Preferably, the wall thickness of the layers 5, 6, 7 and 8 in the radial direction outwards from the first layer 5 at least for some of the successive layers. The scouring layer 9 consists in the embodiment shown here made of thermoplastic polyurethane. It is also applied to the base body by extrusion. A particularly simple manufacture of the fluid line 1 and a reliable hold of the abrasion-resistant layer 9 on the base body are achieved by this.

FIG. 2 shows a schematic longitudinal sectional view of the fluid line 1. Only the basic body is indicated, which consists of layers 5, 6, 7 and 8. On this, the protective layer 9 is applied. It is clear that the fluid line 1 in the axial direction with respect to the longitudinal central axis 4 has areas 10 and areas 11 which alternate in the axial direction. In areas 10, the abrasion protection layer 9 consists of the thermoplastic polyurethane. In the regions 11, however, it is formed from a different material, for example from a rubber-like material. This other material is preferably chosen such that it is easier to detach from the base body than the thermoplastic polyurethane. FIG. 3 shows a further longitudinal sectional illustration of the fluid line 1 in schematic form. The areas 10 and the areas 11 are again present. It is now provided that an adhesion promoter 12 is present in the areas 10 between the abrasion protection layer 9 and the base body. This is not the case in areas 11. The thermoplastic polyurethane is applied to the base body without an adhesive. This makes it easier to strip the fluid line 1, that is to say to remove the abrasion protection layer 9, in the regions 11. In other words, the abrasion protection layer 9 adheres more strongly to the base body in the regions 10 than in the regions 11.

FIG. 4 shows a further embodiment of the fluid line 1 in a schematic longitudinal section. It can be seen that the base body has a surface structure 13 to which the abrasion protection layer 9 is applied. In the exemplary embodiment shown here, the surface structure 13 is composed of webs 14 spaced apart from one another in the axial direction, only a few of which are indicated here by way of example. Through the webs 14, the base body is designed in the manner of a monitoring tube. The use of the surface structure 13 improves the mechanical adherence of the abrasion protection layer 9 to the base body.

Claims

EXPECTATIONS 1. A method for producing a fluid line (1) which has a base body with at least one layer consisting of plastic (5, 6, 7, 8), characterized in that an abrasion-resistant layer (9) made of thermoplastic polyurethane is extruded onto the base body is applied. 2. The method according to claim 1, characterized in that the abrasion protection layer (9) is applied to an outer layer of the base body, which consists of polyamide, polypropylene or polyphthalamide. 3. The method according to any one of the preceding claims, characterized in that the base body is cooled before and / or during extrusion and / or the fluid line (1) after the application. 4. The method according to any one of the preceding claims, characterized in that during the extrusion, the thermoplastic polyurethane is alternately applied to the base body with another substance. 5. The method according to any one of the preceding claims, characterized in that an adhesion promoter is applied between the thermoplastic polyurethane and the base body, in particular only in certain areas. 6. The method according to any one of the preceding claims, characterized in that the fluid line (1) after the application of the abrasion-resistant layer (9) is subjected to a thermal after-treatment, and / or that a crosslinking accelerator is added to the thermoplastic polyurethane before application . 7. The method according to any one of the preceding claims, characterized in that the abrasion protection layer (9) is formed with a plurality of sub-layers, the sub-layers consisting of different materials. 8. The method according to any one of the preceding claims, characterized in that the abrasion-resistant layer (9) is formed at least in regions with air pockets. 9. The method according to any one of the preceding claims, characterized in that the base body is provided with a surface structure (13) before application. 10. The method according to any one of the preceding claims, characterized in that between the base body and the abrasion protection layer (9) and / or in the abrasion protection layer (9) an additional layer is arranged, in particular during extrusion. 11. The method according to any one of the preceding claims, characterized in that a film or a flat structure, in particular a woven fabric, knitted fabric, knitted fabric or braid, is used as the additional layer. 12. Fluid line (1), in particular manufactured according to the method according to one or more of the preceding claims, which has a base body with at least one layer consisting of plastic (5, 6, 7, 8), characterized in that on the Base body a chafing layer (9) made of thermoplastic polyurethane is applied by extrusion.