DE102018251758A1 - Method for producing a fluid line and corresponding fluid line - Google Patents

Abstract

The invention relates to a method for producing a fluid line (1) which has a base body with at least one layer (5, 6, 7, 8) made of plastic. It is provided that an abrasion protection layer (9) made of thermoplastic polyurethane is applied to the base body by extrusion. The invention further relates to a fluid line (1).

Description

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.

The publication is for example from the prior art DE 20 2011 109 257 U1 known. 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 by energy transfer maintains.

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 protection layer made of thermoplastic polyurethane is applied to the base body by extrusion.

The fluid line serves 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. The fluid line preferably serves as a fuel line and thus for supplying 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 can have only a single 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 an installation space in which the fluid line can come into contact 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 concerns above all 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 sometimes no longer be respected.

This means that contact points of the fluid line with 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, it 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 extrusion can be used as extrusion. The abrasion protection layer is extruded onto the base body after the base body has been formed. The basic body is therefore first produced or formed, preferably also by extrusion. The abrasion protection layer is then extruded onto the already formed, in particular extruded, base body. The abrasion protection layer has, for example, a layer thickness of at least 0.1 mm to a maximum of 0.5 mm. It is preferably at least 0.3 mm to at most 0.5 mm.

The abrasion protection layer is particularly preferably formed at the same time as 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 protection 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 in order to prevent thermal damage to the material, namely to avoid the polyurethane in dead zones.

The abrasion protection layer consists of the thermoplastic polyurethane. The thermoplastic polyurethane belongs to the product class of thermoplastic elastomers (TPE). It can be used in a cross-linked or uncross-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 behaves at room temperature comparable to the classic elastomers, but can be plastically deformed when heated and thus shows a 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 for 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). Thereby thermoformability of the fluid line can be achieved with a low resilience. 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 on the abrasion protection layer, for example during extrusion or by extrusion, which extend in the axial direction, in particular continuously, with respect to a longitudinal center axis of the fluid line. Additionally or alternatively, cross strips or a cross structure of longitudinal strips and cross strips can be formed on the abrasion protection 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 mesh 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 the extrusion or during the 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 protection 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, 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 fluid line after it has been formed, this is, however, 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, a plurality of heating conductors, in particular uninsulated heating conductors, can be used spaced apart, in particular parallel spaced apart. 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 further conceivable to provide a connection point of the heating conductor at the cutting 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 also be used instead of the heating conductor. Such a sensor 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 ³ to at most 1.6 g / cm ³ , in particular from at least 1.20 g / cm ³ to at most 1.30 g / cm ³ , on. 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 ³ to 90 mm ³ . 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, by means of 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, 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. Under the Fluoropolymer is to be understood as a fluorinated polymer. It is characterized by a high resistance to chemicals and high temperatures, in other words by a high chemical resistance and / or by 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 for example in the form of a glass fiber reinforcement, a carbon fiber reinforcement or an aremid fiber reinforcement. 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 add at least one additional layer of the fluid line in addition to the three layers already mentioned. However, the first layer preferably always represents the inner layer. The first layer is always followed by the second layer and the third layer, the second layer directly adjoining the first layer and the third layer directly adjoining 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 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 preferably takes place in the longitudinal direction of the fluid line, that is to say 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 selected such that it can be washed off 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 adhesive promotes better adhesion of the polyurethane to the Basic 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 protection 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. Any tendency to stick, on the other hand, decreases. This post-crosslinking 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 post-crosslinking, the abrasion protection 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 formed at least in regions 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 preferably takes place 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 present in the axial direction with respect to the longitudinal central axis of the fluid line, so that regions with a larger diameter alternate with regions with a smaller diameter in the axial direction. Other surface structures can of course also be realized. The formation of the surface structure on the one hand 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 heating 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 protection layer. For example, it is applied to the base body during the extrusion and coated with the abrasion protection layer by the extrusion. In this respect, 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. Here, the abrasion protection layer is formed during the extrusion and the additional layer is arranged such that the additional layer subsequently held at a distance from the base body by the abrasion protection layer and 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 consist exclusively of the metal. 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 additional 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. As a result, particularly good thermal conductivity and a particularly low electrical resistance of the fluid line are achieved. However, the film leads to a comparatively rigid fluid line. It can therefore be provided to use the flat structure or textile flat structure which consists of metal and / or the other material or at least has this instead of the film. 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 according to the method 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 protection layer made 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 its production can be further developed in accordance with the statements in the context of this description, so that reference is made to this extent.

• 1 eine schematische Schnittdarstellung durch eine Fluidleitung,
• 2 eine schematische Längsschnittdarstellung durch die Fluidleitung in einer ersten Ausführungsform,
• 3 eine schematische Längsschnittdarstellung der Fluidleitung in einer zweiten Ausführungsform, sowie
• 4 eine schematische Längsschnittdarstellung der Fluidleitung in einer dritten Ausführungsform.

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:

• 1 2 shows a schematic sectional illustration through a fluid line,
• 2nd 1 shows a schematic longitudinal section through the fluid line in a first embodiment,
• 3rd a schematic longitudinal sectional view of the fluid line in a second embodiment, and
• 4th is a schematic longitudinal sectional view of the fluid line in a third embodiment.

The 1 shows a schematic representation of a fluid line 1 that consist of a multilayer composite 2nd consists. The multi-layer composite 2nd encompasses to form a fluid flow space 3rd the fluid line 1 a longitudinal central axis 4th the fluid line 1 completely in the circumferential direction. Seen in cross section, the multilayer composite is made 2nd from a first layer 5 , a second layer 6 , a third layer 7 and a fourth layer 8th . The layers 5 , 6 , 7 and 8th form a basic body of the fluid line 1 . There is an abrasion protection layer on the base body 9 upset. Each of the layers 5 , 6 , 7 and 8th is continuous 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 be valid.

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

The 2nd 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 8th consists. The abrasion protection layer is on these 9 upset. It becomes clear that the fluid line 1 in the axial direction with respect to the longitudinal central axis 4th Areas 10th as well as areas 11 has, which alternate in the axial direction. In the fields of 10th there is the abrasion protection layer 9 made of thermoplastic polyurethane. In the fields of 11 on the other hand, it is formed from another 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.

The 3rd shows a further longitudinal sectional view of the fluid line 1 in schematic form. Again, the areas are 10th and the areas 11 in front. It is now envisaged that in the areas 10th between the abrasion protection layer 9 and the base body an adhesion promoter 12th is present. This is in the areas 11 not the case. In this, the thermoplastic polyurethane is applied to the base body without adhesion. This will strip the fluid line 1 , i.e. removing the abrasion protection layer 9 , in the fields of 11 facilitated. In other words, the abrasion protection layer sticks 9 in the fields of 10th stronger on the body than in the areas 11 .

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

QUOTES INCLUDE IN THE DESCRIPTION

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Patent literature cited

• DE 202011109257 U1 [0002]

Claims (12)

Method for producing a fluid line (1) which has a base body with at least one layer (5, 6, 7, 8) made of plastic, characterized in that an abrasion protection layer (9) made of thermoplastic polyurethane is applied to the base body by extrusion. Procedure 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. Method according to 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 application. Method according to one of the preceding claims, characterized in that during the extrusion, the thermoplastic polyurethane is alternately applied to the base body with another substance. Method according to 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. Method according to one of the preceding claims, characterized in that the fluid line (1) is subjected to a thermal aftertreatment after the abrasion protection layer (9) has been applied, and / or that a crosslinking accelerator is added to the thermoplastic polyurethane before the application. Method according to one of the preceding claims, characterized in that the abrasion protection layer (9) is formed with a plurality of partial layers, the partial layers consisting of different materials. Method according to one of the preceding claims, characterized in that the abrasion protection layer (9) is formed at least in regions with air pockets. Method according to one of the preceding claims, characterized in that the base body is provided with a surface structure (13) before application. Method according to one of the preceding claims, characterized in that an additional layer is arranged between the base body and the abrasion protection layer (9) and / or in the abrasion protection layer (9), in particular during extrusion. Method according to 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. Fluid line (1), in particular produced 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 an abrasion protection layer (9 ) made of thermoplastic polyurethane by extrusion.

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