Assembled heatable media line and method for its manufacture

Abstract

Assembled heatable media line (1) with a hose- or tubular media line (10) and with at least one line connector (13, 14, 18) arranged on the end thereof, wherein the media line (10) has a line wall (11) and an inner cavity (12) surrounded by the line wall (11), wherein the line wall (11) has an outer side (110) and an inner side (111), wherein at least one device for heating the media line is provided, wherein the device for heating the media line is at least one electrically conductive lacquer (15) which is provided on the outer side (110) and / or inner side (111) of the line wall (11) in at least one layer, and wherein the media line (10) is provided with at least two electrical conductors for contacting the conductive lacquer (15), which are in electrical contact with the electrically conductive lacquer (15), wherein the electrical conductors (5,6,7,8,9,19,20,21) as a wire and / or foil and / or stranded wire and / or conductor track and / or electrodes (20, 21) coextruded with the media line (10) are applied to the line wall (11).

Description

The invention relates to a ready-made heatable media line having a hose- or tubular media line and having at least one line connector arranged on the end side thereof, wherein the heatable media line has a line wall and an inner cavity surrounded by the line wall, wherein the line wall has an outer side and an inner side, wherein at least one device for heating the media line is provided, wherein the device for heating the media line is at least one electrically conductive paint which is provided on the outer side and / or inner side of the line wall at least in one layer, and wherein the media line is provided for contacting with at least two electrical conductors which are in electrical contact with the electrically conductive paint, and to a method for producing such a ready-made heatable media line.Ready-made electrically heatable media lines and methods for producing them are known in the prior art. In particular in vehicles, a series of media lines are provided in order to usually conduct liquid media. At low temperatures, the medium flowing in the medium lines threatens to freeze, which is why heating of the medium line is usually provided. For connecting two media lines or for connecting such a media line to any desired unit, line connectors are usually used, which are arranged on the end side of the media line. The media line itself can be tubular or tubular. The tubular or tubular part of the heatable media line is connected at the end to the line ties. It is also known to heat only parts of the heatable media line or to heat the entire heatable media line including the line connectors arranged at the end or at least one of the line connectors.Media which, due to a relatively high freezing point, already tend to freeze at still very high ambient temperatures are often conducted through the media lines, as a result of which the functionality of a vehicle, for example, can be impaired or even considerably impaired, as in media lines through which an aqueous urea solution flows as medium, which are used as NO X- reaction additive for engines with so-called SCR catalysts.A wide variety of embodiments are known for heating the media lines, for example the winding of a heating wire around the media line and optionally one or both line connectors. If the medium line is provided with a first heating wire or a first heating strand and the line connector with a second, an electrical connection of the heating wires or heating strands to line connectors and a tubular medium line is required. Advantageous when providing a winding with heating wire or heating strand is the high variety of variants which can be achieved by varying the winding. However, wrapping with heating wire or heating strand is also associated with a high assembly effort and leads to a high variety of variants and a restriction in the electrical design and the resistance or the power. In addition, depending on the configuration of the winding, it can lead to an uneven heat introduction into the interior of the media line and the line connectors. In particular, the formation of what are known as hotspots is possible, at which too much heat is introduced into the tubular or tubular part of the medium line and optionally also the line connector or connectors, so that damage can occur there as a result of overheating. Furthermore, if a winding with heating wire or heating strand is provided, overheating of the medium line is also possible under incorrect operating conditions, i.e. for example an unsuitable operating voltage, excessively high ambient temperatures, etc. In addition to the provision of heating wires or heating strands which are applied to the media line or are introduced into a layer in the line wall, a heat layer in the form of an electrically conductive plastic layer or a plastic layer which generates heat by means of the electrical resistance can also be provided for heating the media line, wherein electrical conductors are designed as contact poles or electrical resistance heating conductors and thereby enable heating or provide heat transfer into the heat layer as a heating conductor.For example, WO 2010 / 080 890 A1 discloses an electrically heated flexible liquid line having an elongate flexible tubular body which comprises an electrical resistance heating device. This surrounds the liquid flow path. In one embodiment, an electrically conductive wire is disposed in the tubular body to introduce heat into the liquid flow path. In another embodiment, a layer of electrically conductive polymers is disposed within the tubular body surrounding the liquid flow path.According to DE 20 2005 004 602 U1, a heatable liquid line with conductors embedded in the jacket of the liquid line is disclosed. In this case, an innermost layer, which is surrounded by a middle layer made of an electrically conductive polymer with a positive temperature characteristic of the electrical resistance and electrical conductors embedded therein, is provided, wherein the innermost layer is a plastic tube through which liquid flows. An outer layer surrounds the middle layer, the outer layer being made of an insulating material. The middle layer consists of a thermoplastic polymer with electrically conductive particles in the form of a PTC polymer layer extruded onto the innermost layer.Also according to DE 37 30 580 C1, an electrically heatable hose is known, in which electrodes are embedded in the jacket of the hose and a homogeneous conductive layer is arranged between these, which forms the hose wall. The electrically conductive layer consists of a mixture of a polymer base material and carbon black or graphite, the electrodes of a copper braid or of conductive plastic.According to WO 2012 / 143 121 A1, too, an electrically heatable media line is known which is multi-layered. In this case, heating conductors are embedded in a heating layer in a radially and / or axially predetermined position in a wound manner in the longitudinal direction of the medium line. This consists in particular of an extrudable plastic material which is filled with a filling material. The degree of filling of the plastic material is decisive for whether a thermally conductive or an electrically conductive layer is present. In the latter case, the conductive particles of the layer touch one another and thus lead to an electrical conductivity.DE 196 51 733 A1 discloses a liquid hose which comprises a resistance region and an insulating outer layer and an insulating inner layer. The resistance region consists of a rubber compound which is designed as an electrical resistor by adding a conductive substance to a rubber-elastic material. If the resistor region is coupled to a triggering element designed as a central locking system for a motor vehicle or to the ignition, electric current is conducted through the resistor region.AT 406 924 B discloses a heating element for electrically heated planar or curved surfaces, wherein a planar resistance mass is provided as the heating element, on one surface of which a first planar electrode for supplying current and on the other surface of which a second planar electrode for discharging or forwarding current are arranged, wherein the current flow in the resistance surface runs substantially perpendicular to its surface.Furthermore, DE 17 65 622 B2 discloses an electric heating cable which has a hose of any desired length made of insulating material, the inner side of which is provided with an electrically conductive lacquer layer. The hollow space of the hose is filled with an insulating material.DE 10 2004 006 795 A1 discloses a testable connection which serves primarily for liquid or gaseous media in order, on the one hand, to correctly check the correct assembly of a plug connection already in the factory and, if appropriate, to document it for quality assurance, on the other hand, a failure can be indicated during operation and a fault finding can be substantially simplified by the possibility of identifying the defect location. For this purpose, connectors for lines of gaseous or liquid media are provided, in which both the plug and the socket are equipped with a preferably electrical conductor or conductive layer, so that a continuous conductor is produced when these connectors are correctly joined together.DE 10 2012 002 411 A1 discloses a heatable media line having at least one line connector and a heating element, wherein the heating element has at least one stranded wire, in particular two stranded wires. The media conduit has at least one media resistant inner layer and at least one pressure receiving outer layer, and one and the same strand extends continuously along both the media conduit and the conduit connector. From this publication, a method for producing the heatable media line is also known, wherein the media line is continuously wound with the heating element on its outer side having a pressure carrier as an outer layer and the heating element is fastened or fixed on the media line by at least one fastening means or arranged below the media line.In order to avoid the above-mentioned disadvantages, which relate in particular to media lines provided with heating wires or heating strands, and in particular to be able to provide uniform and rapid heating during the desired heating of the media line, it would be desirable to modify an electrically heatable media line to the effect that these goals are achieved.The object of the present invention is therefore to modify a ready-made heatable medium line and a method for producing such a ready-made heatable medium line to the effect that uniform heating, good distribution of the heat provided and a more rapid heating of the medium flowing through the heatable medium line are achieved.The object is achieved for a heatable media line according to the preamble of claim 1 in that the electrical conductors are applied to the line wall as wire and / or film and / or stranded wire and / or conductor track and / or electrodes coextruded with the media line. For a method for producing such a pre-fabricated heatable media line, the object is achieved in that an electrically conductive paint is sprayed on the outer and / or inner side of the line wall of the media line after the extrusion of the media line and / or, after the extrusion of the media line, the latter passes through a paint bath of an electrically conductive paint and / or an electrically conductive paint is applied to the line wall by a dipping method or application method and the electrically conductive paint is electrically contacted by at least two electrical conductors, and before or after the application of the electrically conductive paint, the media line is provided on the end side with at least one line connector. Further developments of the invention are defined in the dependent claims.This creates a ready-made heatable media line, the tubular or tubular media line of which has a line wall and an inner cavity surrounded by the latter, through which medium can flow, wherein the line wall is provided on its outer side, optionally additionally or alternatively on its inner side, with at least one electrically conductive paint which serves for heating the media line. For this purpose, contacting of the paint is necessary, which is advantageously provided by at least two electrical conductors which extend along the media line and are in contact with the paint. The electrical conductors are understood to be electrically conductive or conductive elements which can have a wide variety of configurations. A heatable media line is understood to mean a media line which can be heated by being provided with the at least one heating device for heating the media line or the medium flowing through it or located in it. In the present case, this is the at least one electrically conductive paint which makes electrical contact via the at least two electrical conductors and accordingly serves or can serve for electrically heating the medium line or the medium flowing through it or the medium located therein and optionally frozen. The ready-made heatable media line is understood to mean a media line already provided with at least one line connector arranged on the end side on a tube- or tube-shaped media line. Line connectors can be plug connectors here which are designed as plug part and coupling part in order to be able to be plugged into one another. Depending on the type of connector with which the line connector arranged on the ready-made media line is to be joined, in particular plugged together, the at least one line connector arranged on the end side of the ready-made media line is designed as a plug part or coupling part.The electrical conductors can thus have a wide variety of configurations, for example in the form of conductor tracks, wires, strands, films, electrodes coextruded during the production of the media line, etc. The lacquer can be applied in one or more layers. Furthermore, not only a single paint but also a plurality of different paints can be applied in multilayer fashion on the outer side, optionally additionally or alternatively inner side, of the line wall. The at least one lacquer layer can be applied directly after the extrusion of the media line to the latter on the one hand by spraying. It is also possible to apply the at least one electrically conductive paint by passing the media line through a paint bath after the extrusion. It is likewise possible to apply the electrically conductive paint to the line wall by a dipping method or an application method, such as spraying, rolling, brushing, brushing. In any case, the lacquer can completely surround the media line on its outer and / or inner side, so that uniform heating is possible on account of the good distribution of the lacquer layer over the surface of the media line. The conductive lacquer can furthermore be applied as a structured lacquer layer on the line wall of the media line and / or the at least one line connector in order to enable a power regulation of the applicable heating power. For example, this can be done by segmented rollers, by way of sections of different painting, for example by way of a paint gun, which is temporarily switched off one and two times, or by way of partial covering of regions or sections of the line wall of the media line that are not to be painted. In particular, it is possible to form the lacquer layer annularly in the form of rings with variable width and / or a variable width of the distances between the lacquer rings.By providing a lacquer layer which is comparatively thin and has a low mass in comparison, for example, with heating wires or heating strands, a more rapid heating than by the latter is possible. The application of the paint by dipping or passing through a paint bath or spraying, etc. on the surface of the line wall means a significantly lower outlay in terms of assembly in comparison with the application of heating wires, heating wires or other heating elements by winding around them. Furthermore, fewer components are required, so that the construction of the media line is significantly simplified compared to the above-mentioned media lines of the prior art. By providing the at least one electrically conductive paint on the outer and / or inner side of the media line, a significantly smaller variety of variants is required in comparison with the winding of the same with at least one heating wire or at least one heating strand in order to achieve a desired optimum heat supply to the medium flowing through the media line. The heating power when the at least one electrically conductive paint is provided is thus independent of the length of the medium line when energized radially.At least one electrically conductive paint is used in at least one layer for heat generation in a heatable media line. The at least one paint can be applied in the form of a liquid to the surface of the media line and in particular also to line connectors already connected to the latter. Furthermore, the at least one electrically conductive paint can be applied in the form of a paste or a powder, wherein it can be provided that after evaporation of a solvent of the paste, the liquid or the suspension in which powder serves to increase the conductivity, a solid paint layer forms, wherein paste or powder is provided with a solvent in order to facilitate the application on the media line. Alternatively or additionally, a chemical reaction can take place, whereby the solid lacquer layer is formed. Furthermore, the at least one electrically conductive paint can be designed as at least two-component paint, wherein a solid paint layer is formed by chemical reaction as a result of mixing of a plurality of substances. For example, an epoxy resin can be used as a two-component varnish. It is therefore not a liquid melt, as in the case of the provision of a conductive plastic material, that is to say a thin lacquer layer in the form of a liquid, a paste or a powder is applied. A conductive plastic material is usually extruded on in the form of a liquid melt, while the electrically conductive lacquer is applied after the extrusion of the line wall by spraying, dipping, etc. In principle, it is therefore even possible to make a non-heatable media line even much later a heatable media line by applying at least one layer of an electrically conductive paint. This is usually not possible when a conductive plastic layer is provided, which is extruded onto an extruded first layer of a line wall.The electrically conductive paint may comprise at least one carbon modification and / or other electrically conductive particles for generating the desired electrical conductivity. In particular, carbon black, graphite or even carbon nanotubes can be introduced into the paint as carbon modification in order to generate the desired electrical conductivity of the paint.The electrical conductors can, as already mentioned, have a wide variety of configurations. For example, they can be applied as a metal film or conductor track on the line wall, in particular above or below the at least one lacquer layer. Furthermore, it is possible to apply the at least two electrical conductors by a printing method and / or by liquid application, such as from a tube-like vessel. Furthermore, application by vapor deposition is possible. Instead of providing the electrical conductors in the form of a film, these can also be applied to the line wall as a wire and / or foil and / or strand and / or conductor track, in particular in a spiral shape or parallel to the longitudinal extent of the media line before the line wall is provided with the at least one lacquer layer. The at least two electrical conductors can be applied, for example, by winding the tubular or tubular media line and, if appropriate, also the line connector connected to it. It is likewise possible to provide the at least two electrical conductors as continuous layers above and below the at least one lacquer layer on the line wall. The at least two electrical conductors can thus be applied to the latter in the form of conductor tracks, in particular conductor tracks running around the media line. If the at least two electrical conductors are coextruded on their line wall during the production of the tubular or tubular media line, the otherwise necessary production step of applying the electrical conductors after the extrusion of the media line can be omitted. In particular, when the electrical conductors are coextruded in the form of electrodes, these are applied to the line wall of the media line before the electrically conductive paint is applied. Accordingly, in this case, a structured application of the paint layer of the electrically conductive paint can be provided, for example by the aforementioned masking of the regions in which the electrodes are provided that are not to be painted.Thermoplastic polymers are suitable for such coextruded electrodes. For example, a polyamide, in particular PA 6, PA 66, PA 12, PA 612, PA 610, PA 11, PA 1010, PA 1012, can be used as the base material or a PPA (polyphthalamide HT-PA), i.e. a high-temperature polyamide, PBT (polybutylene terephthalate), TPE (thermoplastic elastomers), PPS (polyphenylene sulfide), PE (polyethylene) or else PP (polypropylene). Advantageously, the material used for the coextruded electrodes has a volume resistivity of ≥10 E-04 Ω*m. An electrical conductivity of the base material can be achieved, for example, by metallic additization of the base material, i.e. addition of metallic particles, or also addition of other conductive particles.A variation of the heating power can be generated by using different conductor tracks, by laser structuring of these or by varying the geometry of the conductor tracks or electrodes. Furthermore, it is possible to vary the heating power when more than two conductor tracks or electrodes are provided by targeted current supply to only individual conductor tracks. When using more than two conductor tracks, the heating power can thus be different in a targeted manner at different points of the media line by means of a targeted current application or non-current application of individual conductor tracks or electrodes. Furthermore, it is possible to vary the heating power in a targeted manner by varying the printing and / or winding of the line wall with the electrical conductors. With regard to the winding, a variation of the sections between the conductor tracks and / or the width of the conductor tracks is possible. The heating power can likewise be varied by laser structuring of the at least two electrical conductors.The at least one paint layer itself can also be laser-structured in order to provide increased heating power in a targeted manner at some points of the media line and to provide a larger surface area of the paint layer than in the regions close to the engine at other points, which are not additionally heated, for example at points particularly exposed to the ambient temperature and which are not additionally heated by heat sources, such as the vicinity of the engine of a vehicle. Furthermore, it is possible to vary the layer thickness of the at least one lacquer layer over the length of the media line in order to compensate for power losses from electrical supply lines over the length of the line.A respective line connector can be mounted and fastened on the end side of the media line before the application of the at least one paint layer, in particular in a positively locking manner by, for example, mandreling, in a materially bonded manner by, for example, welding, ultrasonic welding, laser welding, adhesive bonding. Before the media line is provided with the electrically conductive paint, the latter is thus provided on the end side with the at least one line connector and only subsequently is the at least one paint layer applied to the media line, in particular together with the line connectors. When applying the at least one paint layer to the at least one line connector, heating of the line connector together with the tubular and / or tubular media line is also possible when contacting the paint layer. Alternatively, it is possible that at least one line connector is applied at the end side to the media line by injection molding it with the corresponding profile of the line connector. In this case, the tubular or tubular media line is first provided with the at least one electrically conductive paint and only subsequently is the line connector or connectors applied. After the injection molding, the at least one electrically conductive lacquer layer is seated with the contour of the line connectors, i.e. with these, in the region between the tubular or tubular media line and the line connector resulting from the injection molding. A straight line connector can accordingly be heated up to close into the tip, since the media line with lacquer layer can extend up to this point. The end face of the media line wall is advantageously insulated from contact with the medium flowing through the media line. If an angle line connector is provided, a thermally conductive material, in particular in the form of a sleeve and / or at least one metal foil, can additionally be provided for the purposes of heat transport as far as into the tip of the angle line connector. When a tubular or tubular medium line already provided with at least one electrically conductive paint layer and electrically contacting is encapsulated with line connectors, the outer side of the medium line wall is advantageously initially partially freed of the electrically conductive paint and then encapsulated by injection in order to create a cohesive connection between the medium line and the line connector. Furthermore, the electrically conductive lacquer layer can be suitably pretreated in order to interrupt it there and to enable integrally molding or overmolding of the media line, which is preferably made of plastic. By means of the injection molding, it is likewise possible to provide an insulation of the at least one electrically conductive paint layer, depending on the material of which the line connector or connectors created / created by injection molding is / are made.To ensure functionality and reliable operation, the heatable media line can be thermally and electrically insulated on the outside, in particular thermally by providing at least one cladding tube enveloping the heatable media line on the outside and / or an outer foam casing, wherein the longitudinal connectors of the ready-made heatable media line can also be thermally insulated and optionally electrically insulated by an outer insulation envelope or protective envelope or caps. Electrical insulation can be provided by an insulating lacquer layer or by foaming around and / or by, for example, an adhesive tape on the outside of the heatable media line or another electrically insulating device such as a closed-cell foam. The ready-made heatable media line provided with the at least one electrically conductive lacquer layer can thus subsequently be thermally and / or electrically insulated on the outside.A current flow can be generated between the electrical conductors arranged in the lacquer layer when a voltage is applied, for example by contacting at one or both ends of the media line, and heating of the heatable media line can thereby be achieved. The current flow can preferably take place radially or axially to the medium line.It has proven to be further advantageous to provide a lacquer protection layer over the at least one electrically conductive lacquer layer for protecting the electrically conductive lacquer layer against external chemical influences and / or for electrical insulation. A second lacquer layer can thus be arranged as a protective layer over the at least one electrically conductive lacquer layer.Furthermore, the ready-made heatable media line can have a PTC effect, wherein with increasing temperature the current flow rate is reduced and thus the heating power decreases. This is possible depending on the properties of the electrically conductive paint or the electrically conductive fillers contained therein. Switching off can take place in particular at excessively high temperatures. PTC is understood to mean a positive temperature coefficient; PTC effect is understood to mean the effect that the electrical resistance increases as the temperature rises. This has the result that the medium line is switched off with respect to its heating at excessively high temperatures if the heating power drops to zero.It has proven to be further advantageous if the electrically conductive lacquer is elastic to a predeterminable extent and adheres to the surface of the line wall to enable a shape bending of the heatable media line and has a predeterminable breaking elongation. The adhesion to the surface of the line wall should be sufficient to prevent the at least one lacquer layer from becoming detached from the surface of the line wall. This ensures troublefree operation, i.e. troublefree heating, of the media line even in the bent state. Cracks in the lacquer layer can also be prevented in particular by connecting the media line to the at least one line connector at the end, bending the media line connected to the at least one line connector in a shape and applying the electrically conductive lacquer after the bending of the media line provided with the at least one line connector in a shape. Application of the paint after the shaping has simply resulted in it not being damaged by the shaping, since it is first applied after it.As already mentioned, the heatable media line can be produced on the one hand by providing a tube- or tube-shaped media line on the end side with one or two line connectors, which can be applied there in a form-fitting manner, such as by mandreling, or in a materially integral manner, such as by laser welding, ultrasonic welding, adhesive bonding, etc. The at least one electrically conductive lacquer layer is subsequently applied to the media line and at least a part of the at least one line connector arranged at the end side thereof. A tube made of polyamide is suitable as a tubular media line, for example. If individual regions of this or of the line connectors are not to be provided with electrically conductive paint, it has proven advantageous to cover or mask them tightly beforehand in order to prevent paint from being applied there. After the application of the at least one lacquer layer, this can advantageously be dried first before the at least two conductor tracks are subsequently applied. These are also subsequently dried. If the at least two electrodes are coextruded together with the production of the media line, the subsequent application of the at least two conductor tracks is dispensed with, so that the at least one lacquer layer can be applied to the media line directly after the extrusion process of media line and electrically conductive or conductive electrodes. Subsequently, the heatable media line can be bent in shape and finally mounted, i.e. in particular a cladding tube, protective caps, etc. can be added. If the media line is to be bent in shape before the application, the media line can be provided in particular with the at least two electrical conductors and the at least one line connector, subsequently bent in shape and only subsequently provided with the at least one lacquer layer. In this sequence, too, the provision of at least one insulating sheathing around the media line and optionally line connector(s) is possible, in particular in the form of cladding tubes and / or protective caps.As an alternative to the production method described above, the tubular or tubular media line can first be provided with the at least one layer of an electrically conductive paint, wherein the tubular or tubular media line can be provided with the paint in particular directly in the extrusion process or downstream thereof in the passage through a dipping bath. Subsequently, it is first dried before electrical conductors, for example in the form of conductor tracks, are applied to the at least one lacquer layer. These too can in turn be dried first before the pipe- or tube-shaped media line, in particular a polyamide pipe, is provided on the end side with line connector contours by injection molding. The heatable media line can then be bent in shape. For contacting the conductor tracks, these can be free-lasered. The final assembly can then be carried out by applying at least one cladding tube, O-rings, etc. When producing an angle line connector contour, the tubular or tubular media line provided with the electrically conductive paint extends only into a partial region of the angle line connector, so that the other region thereof, which is arranged in particular at right angles thereto, remains without any heating possibility. In order to be able to provide heating in this case, the previously mentioned thermally conductive materials, in particular in the form of a thermally conductive foil or sleeve, can be introduced into this region before the overmolding and brought into thermally conductive connection with the heated region.The tubular or tubular media line provided with at least one electrically conductive lacquer layer can be provided not only with the contour of a line connector of complex design, but also with a SAE male plug contour by injection molding. The choice of the shape of the encapsulated line connector contour can be made dependent on the respective application.In addition to applying the at least one paint layer by spraying, dipping, passing through a trough provided with paint, etc., after the extrusion process of the tubular or tubular media line, the latter can also be sprayed with paint in the extrusion line. Such spraying can be provided in-line before or after the winding or printing of the tubular or tubular media line with the at least two electrical conductors. When spraying with the at least one paint layer of an electrically conductive paint, a uniform layer thickness can be achieved. By varying the spraying time, in contrast, it is also possible to achieve an uneven distribution of the layer thickness of the at least one paint layer in order to enable a partially different heat input into the heatable media line.For heating the electrically conductive lacquer layer, a current flow in the direction of the media line can be provided, i.e. heating from one end thereof to the other. This is made possible in particular by the electrical supply conductors engaging in each case one end of the heatable media line. This results in a resistance dependent on the geometry of the heatable media line, i.e. a resistance dependent on the length of the media line and the layer thickness of the electrically conductive lacquer layer. In order to generate a current flow radially to the longitudinal extent of the media line, a conductive radial structure or a structure extending parallel to the longitudinal axis of the media line can be provided for electrical contacting, or an engagement of the electrical supply conductors on two electrical conductors lying opposite one another and thus a resistance independent of length can be generated. Such a conductive radial structure can be realized by providing stranded wire, wire, printing, etc. Furthermore, it is possible to provide a current flow between two films perpendicularly through the lacquer layer provided for heating. In this case, the at least one paint layer serves as resistance heater or the paint heats up strongly and thus leads to heating of the medium flowing through the medium line. Current or heat flows through the at least one electrically conductive paint.The electrical supply conductors can be contacted with the electrical conductors by soldering, welding, adhesive bonding, clamping or injection molding. As already mentioned, wire or stranded wire can be used as electrical conductors, which are wound around the tubular or tubular media line. Furthermore, a metallic print can be provided, which can be applied by applying liquid to the surface of the line wall, which forms a solid layer after drying and is electrically conductive. Furthermore, at least one metal foil can be adhesively bonded to the line wall, in the form of a winding similar to an adhesive tape. When adhering to the electrically conductive lacquer, an electrically conductive adhesive layer is advantageously provided in order to make possible a contacting to the lacquer layer. Furthermore, a conductive lacquer can be applied in the form of two conductor tracks by painting with an electrically conductive lacquer in the form of two conductor tracks. A third lacquer layer can be applied over the conductive lacquer layer in the form of the two conductor tracks. It is also possible to weave electrical conductors into a fabric and apply it to the media line provided with the at least one electrically conductive lacquer and / or arrange it under the lacquer layer. In each of the cases, the application of an insulation layer and / or foam layer for insulation is subsequently possible, in particular also using an extrusion method.Contacting of the electrically conductive lacquer layer can be effected by providing the electrical conductors on the outer side of the lacquer layer and / or under the lacquer layer. It is thus possible to arrange electrical conductors also above and below the at least one lacquer layer. In both cases, a radial current flow is provided, wherein, if provided on the outer side of the lacquer layer, the electrical conductors are directly accessible for contacting and, if provided under the lacquer layer, these have to be exposed, e.g. free-lasered or scraped free, in order to find contact-making points for contacting the two electrical conductors. When these are arranged under the lacquer layer, however, they are mechanically protected against damage by the lacquer layer. In any of the cases, it is possible to provide a further lacquer layer as a protective layer against negative chemical influences.In principle, it may occur that the heatable media line twists under the influence of temperature, on account of the different thermal expansion of the electrical conductors compared to the electrically conductive lacquer layer or the material of the tubular or tubular media line. However, this can optionally be compensated for by countermeasures, such as for example by forming the electrical conductors as layers or foils which are arranged above and below the electrically conductive lacquer layer.The provision of such films has the result that no twisting of the media line occurs during thermal expansion, since uniform temperature action is possible over the entire circumference of the media line through the films and as a result no temperature-induced mechanical stress occurs.To explain the invention in more detail, exemplary embodiments thereof are described in more detail below with reference to the drawings. These show in: FIG. 1 shows a side view of a ready-made heatable media line according to the invention with a tubular media line with straight line connector arranged at the end and with angle line connector arranged at the end, wherein an electrically conductive lacquer layer according to the invention is applied after the assembly of tubular media line and line connectors, FIG. 2 shows a side view of a ready-made heatable media line according to the invention with a tubular media line with straight line connector arranged at the end and angle line connector arranged at the end, wherein the line connectors are formed by injection molding around the tubular media line previously provided with at least one electrically conductive paint according to the invention, FIG. 3 shows a side view of an end-side section of a heatable media line according to the invention with a SAE male plug contour applied by injection molding there after application of an electrically conductive lacquer layer according to the invention, FIG. 4 shows a side view of a ready-made heatable media line according to the invention with an electrically conductive lacquer layer according to the invention and straight line connectors applied on the end side by injection molding and with two electrical conductors and electrical supply conductors in the region of the two line connectors, FIG. 5 shows a cross-sectional view of a heatable media line according to the invention with an electrically conductive lacquer layer according to the invention and two electrical conductors and electrical supply conductors applied on the outside thereof, FIG. 6 shows a cross-sectional view of a heatable media line according to the invention with two electrical conductors in the form of foils which are arranged above and below an electrically conductive lacquer layer according to the invention, FIGS. 7 aand 7 b show cross-sectional views of a respective heatable media line according to the invention with an electrically conductive lacquer layer according to the invention applied on the outside thereof with electrical conductors in the form of conductor tracks (FIG. 7 a ) and wires (FIG. 7 b ) applied thereon, FIGS. 8 aand 8 b show cross-sectional views of heatable media lines according to the invention with an electrically conductive lacquer layer according to the invention applied in each case on the outside thereof and with in each case two electrical conductors which are arranged in each case under the lacquer layer, firstly in the form of conductor tracks (FIG. 8 a ) and secondly in the form of wires (FIG. 8 b ), FIGS. 9 aand 9 b show cross-sectional views through heatable media lines according to the invention with an electrically conductive lacquer layer according to the invention arranged between electrical conductors configured in each case as foils, FIG. 10 shows a detailed cross-sectional view through a heatable media line according to the invention with an electrically conductive lacquer layer applied on the outside, which has a different layer thickness over the longitudinal extent of the media line, FIG. 11 is a plan view of a developed electrically conductive lacquer layer according to the invention with two electrical conductors connected to the lacquer layer, FIG. 12 shows a side view of an electrically heatable media line according to the invention with an annularly applied electrically conductive lacquer layer and with electrical conductors arranged therebetween in the form of electrodes extruded onto the media line wall, FIG. 13 shows a cross-sectional view through a further embodiment of a heatable media line according to the invention, in which two electrodes approximately opposite one another are extruded onto the tubular media line as electrical conductors and electrically conductive lacquer is arranged between the electrodes, FIG. 14 shows a cross-sectional view through a further embodiment of a heatable media line according to the invention, in which two electrodes, which are arranged approximately opposite one another and are extruded onto the tubular media line, are applied as electrical conductors and between these electrically conductive paint is applied to the outer side of the tubular media line, and FIG. 15 shows a cross-sectional view through a further embodiment of a heatable media line according to the invention, containing two electrodes extruded on a tubular media line, which electrodes are approximately opposite one another, wherein electrically conductive lacquer is arranged on the tubular media line between the electrodes.FIG. 1 shows a side view of a pre-assembled heatable media line 1, which comprises a tubular media line 10 with a line wall 11 with an outer side 110 and an inner side 111 and an inner cavity 12. The ready-made heatable media line 1 further comprises line connectors 13, 14 fastened at the end side to the tubular media line 10, e.g. by means of mandrels or laser welding, wherein the line connector 13 is a straight line connector and the line connector 14 is an angle line connector. On the outside of the two line connectors 13, 14 and of the tubular media line 10 pre-assembled with them, an electrically conductive lacquer layer 15 is applied for heating both the tubular media line and the two line connectors. Only a respective end-side section 130, 140 of the two line connectors 13, 14 is not provided with the electrically conductive lacquer layer 15. During the painting process for providing the heating capability of the media line 10 and of the two line connectors 13, 14, these two end-side sections 130, 140 are covered or sealed accordingly in order to avoid painting there. Two electrical supply conductors 2, 3 are used to contact the electrically conductive lacquer layer 15, which are connected to the latter. At their ends, they are provided with an electrical connector 4 for connection to a current or voltage source (not shown).The application of the at least one electrically conductive paint layer 15 on the outer side of the tubular media line 10 and a part of the two line connectors 13, 14 can be effected by spraying on, dipping in a corresponding paint bath, passing through such a paint bath, applying a liquid, a paste or a powder in which the solid paint layer 15 forms after evaporation of a provided solvent. Furthermore, it is possible to form the electrically conductive lacquer layer 15 by mixing and applying a plurality of substances which form a solid lacquer layer after chemical reaction. To form the electrical conductivity, the paint is provided in particular with electrically conductive particles, in particular comprises a carbon modification.Instead of preassembling the tubular media line 10 and line connectors 13, 14 and subsequently applying the electrically conductive lacquer layer 15, the latter can also be applied first to the tubular media line 10 and then the two line connectors 13, 14 attached to the latter at the end side can be applied there by injection molding around the tubular media line 10 provided with the electrically conductive lacquer layer 15 with the line connector contour. This is indicated in FIG. 2. In the region of the two line connectors 13, 14, the electrically conductive lacquer layer 15 is not arranged on the outer side of the two line connectors 13, 14, but rather in the interior thereof. With regard to the angle line connector 14, this has the result that only the region 142 of the line connector 14 in which the tubular media line 10 is arranged can be directly heated by the electrically conductive lacquer layer 15, but the section 141 arranged at right angles thereto cannot. Depending on the extent to which a medium flowing through this section 141 tends to freeze, and depending on the extent to which heat introduced into the angle line connector 14 through the electrically conductive paint layer 15 is also sufficient for heating the section 141, it may be necessary to heat the section 141 via a thermally conductive device, such as a thermally conductive material, which is in film form, for example for adhering or made of solid material, and may be in sleeve form for insertion into the interior of the line connector. Suitable materials are, for example, aluminum or copper. The thermally conductive device extends from the section 142 heated by the electrically conductive lacquer layer 15 into the section 141 which is not heated by the lacquer layer 15. The entire material of the angled line connector 14 can also be designed to be correspondingly thermally conductive, so that the heat introduced into the paint layer 15 is very well distributed in the entire angled line connector 14, thus also in the section 141 not directly heated by the paint layer 15.The paint layer 15 can be applied in the embodiment variant according to FIG. 2 in the same way as in the embodiment variant according to FIG. 1, with the difference that the electrically conductive paint layer 15 is not provided for the completely pre-assembled combination of tubular media line 10 and line connectors 13, 14, but only for the tubular media line 10.If the tubular media line 10 is not to be provided with a straight or angled line connector 13 or 14 at the end, but is instead designed as a SAE male connector, a corresponding contour can be sprayed onto the end section 16 of the tubular media line 10, as is indicated in the side view in FIG. 3. The shape of the connection contour, which is applied by injection molding onto the end or the end section 16 of the media line 10, can be varied in an application-specific manner and is made dependent in particular on how the respective counter piece to which the heatable media line 1 is to be connected is contoured or formed. As can be seen from FIG. 3, here again, before the overmolding with the connection contour in the form of the SAE male connector 17, the outer side of the tubular media line 10 is provided with the electrically conductive paint layer 15.After the application of the lacquer layer 15 and optionally the line connectors 13, 14, if no preassembly of tubular media line 10 and line connectors 13, 14 is provided, but rather these are applied by injection molding, electrical conductors are applied, for example in the form of conductor tracks, in order to be able to make electrical contact for the power supply, wherein the electrical conductors are connected to the latter via the electrical supply conductors 2, 3. The electrical conductors can be formed in a wide variety of forms, for example as a conductor track, in wire form, stranded form, foil form, etc. They serve for the electrical contacting of the lacquer layer 15 in order to connect the latter to a power supply and thus to be able to effect heating. The electrical conductors are thus the electrical contacting device for the at least one lacquer layer. In the embodiment variant shown in FIG. 1, the electrical conductors are applied after the application, in particular after drying, of the lacquer layer 15, in the embodiment variants shown in FIGS. 2 and 3, the conductor tracks are also applied after the application, in particular after drying, of the electrically conductive lacquer layer 15, that is to say before the tubular media line 10 is encapsulated with the connection contours in the form of the two line connectors 13, 14 or the SAE male connector 17.FIGS. 4 to 9 b show a wide variety of embodiments or arrangement possibilities of electrical conductors which serve for connecting the electrically conductive lacquer layer 15 to an electrical power supply, wherein the electrical conductors are attached in particular in the form of conductor tracks on or to the lacquer layer and a connection to a power supply is effected via the electrical feed conductors 2, 3. In the embodiment variant shown in FIG. 4, two electrical conductors 5, 6 are provided in the vicinity of the two straight line connectors 13, 18, which are arranged annularly around the tubular media line 10. The heating of the medium line thus takes place from one end thereof to the other end thereof, wherein a current flow (illustrated by the arrow P 1) through the lacquer layer 15 from the one electrical conductor 5 to the other electrical conductor 6 or vice versa, i.e. in the longitudinal direction of the medium line, is provided. The resistance that occurs is geometry-dependent, i.e. dependent on the length of the medium line and the layer thickness of the electrically conductive lacquer layer 15.In contrast to the embodiment variant shown in FIG. 4, in the case of the one shown in FIG. 5, the two electrical conductors 7, 8 are arranged on the electrically conductive lacquer layer 15 on the outside in the longitudinal direction of the tubular media line 10 as wire- or stranded heating elements. The current flow thus takes place in the radial direction with respect to the longitudinal extent of the tubular media line 10 or the heatable media line 1, which is indicated by the arrows P 2. Since the current flow takes place in the radial direction, i.e. via the circumferential lacquer layer, a resistance independent of length is provided. The electrical conductors 7, 8 can be designed in a wide variety of forms, for example also as printing or in some other form of a conductive structure.In the embodiment variant shown in FIG. 6, two foils 9, 19 are provided as electrical conductors. The two foils 9, 19 accommodate between them the electrically conductive lacquer layer 15, the foil 9 is thus arranged below the lacquer layer 15, while the foil 19 is arranged thereon, i.e. as an outer layer above the latter. The current flow thus takes place perpendicularly through the lacquer layer 15, which is indicated by the arrow P 3. The electrically conductive paint 15 thereby becomes a resistance heater or it heats itself so strongly that the heat transfer into the interior 12 of the heatable media line and thus a heat transfer to the medium flowing there or frozen medium located in the line lumen or inner cavity 12 of the media line 10 is possible.A current and / or the heat generated thus flows through the electrically conductive lacquer layer 15, depending on the location at which the electrical conductors are arranged with respect to the media line and its electrically conductive lacquer layer 15.Thus, a wide variety of different embodiments are possible as electrical conductors. If the electrical conductors are designed, for example, in the form of wires or strands, they can be arranged by winding the tubular media line which is provided with the electrically conductive lacquer layer 15. If the electrical conductors are designed in the form of a metallic print, they can be applied to the surface of the lacquer layer 15 by applying a liquid containing metal particles (in the context of a printing method), wherein the liquid forms a solid conductor track after the drying process, which is electrically conductive. A further possibility is to glue on a metal foil, for example in the form of a winding similar to an adhesive tape. If the metal foil is adhesively bonded to the electrically conductive lacquer layer 15, an electrically conductive adhesive layer is advantageously used in order to be able to provide contact with the electrically conductive lacquer layer 15.Further possible embodiments for the electrical conductors are shown in FIGS. 12 to 15. According to these, a coextruding of the electrical conductors in the form of electrodes 20, 21 is provided during the extrusion of the tubular media line 10. According to the embodiment variant according to FIG. 20, the electrodes 20, 21 are formed annularly or in sections radially circumferentially, while in the embodiment variants according to FIGS. 13 to 15 they are formed as narrow elongate regions (FIG. 13 ) or somewhat wider circular segment-shaped regions (FIG. 14 ) or also in the form of quarter circle segments (FIG. 15 ). Portions 22 and 23, 24 of an electrically conductive paint extend between the electrodes 20, 21, respectively. The paint sections 22, 23, 24 do not extend beyond the electrodes 20 and 21, respectively, so that the electrodes can be electrically contacted without any problems even without removing the paint sections 22, 23, 24, in order to allow heating of the electrically conductive paint.By means of the respective geometric configuration of the electrodes 20 or 21 during the extrusion thereof onto, in the embodiment variants shown, the outer side of the line wall 11 of the tubular media line 10, the heating power of the electrically conductive paint 22 or 23 or 24 can be adjusted.In the embodiment variant shown in FIG. 12, as in the embodiment variants shown in FIGS. 13 to 15, a structured lacquer layer is applied in each case for regulating the power output. By varying the width b of the respective sections 22 of the electrically conductive paint or also by varying the width of the distances a between these sections 22, in which the electrodes 20, 21 are arranged, a power regulation for adjusting the achievable heating power can be achieved. The structured or only partial application of the sections of electrically conductive paint 22, 23, 24 can be effected by masking the regions in which the electrically conductive paint layer is not to be applied, for example by segmented rolling, switching on and off a device for applying the paint, such as a paint gun, for example, or also by covering the sections or regions not to be painted on the outer side and / or inner side of the tubular media line 10.A further possibility is to apply a so-called conductive paint in the form of two conductor tracks which are formed by applying, such as, for example, dipping, spraying, rolling, brushing, in particular the electrically conductive paint layer 15, with an electrically conductive paint. For protection, a further lacquer layer can be arranged over the conductive lacquer layer which forms the two conductor tracks. A further possibility of forming the electrical conductors is to weave them into a fabric which is subsequently applied on the electrically conductive lacquer layer 15 by coating or beforehand, the electrical conductors being subsequently exposed for contacting. In any case, an insulation layer can be arranged over the electrically conductive lacquer layer 15, which is at least partially provided with the electrical conductors, for example an insulation layer in the form of a foam layer, which is extruded over the lacquer layer 15 with electrical conductors.Depending on where the electrical conductors are arranged and in what form they are formed, they can be connected or contacted more easily or more poorly to the electrical supply conductors 2, 3. FIGS. 7 a, 7 band 8 a, 8 b show different embodiments of electrical conductors and different positionings thereof with respect to the electrically conductive lacquer layer 15. In all variant embodiments, a radial current flow, i.e. a current flow as indicated in FIG. 5 by the arrow P 2, is provided in each case. In FIGS. 7 aand 7 b, the two electrical conductors 7, 8 are each arranged on the outer side 150 of the electrically conductive lacquer layer 15, wherein in the embodiment variant according to FIG. 7 a, the electrical conductors are formed, for example, in the form of a print in the form of conductor tracks, while in the embodiment according to FIG. 7 b, they are formed in the form of wires or strands. In both variant embodiments according to FIGS. 7 aand 7 b, the electrical conductors 7, 8 are each directly accessible for contacting, so that the electrical supply conductors 2, 3 can be connected to them, for example, by soldering, welding, adhesive bonding, clamping or optionally also insert molding.In the embodiment variant according to FIGS. 8 aand 8 b, such direct contacting with the electrical supply conductors 2, 3 is not possible, since the two electrical conductors 7, 8 are arranged below the electrically conductive lacquer layer 15, i.e. on the outer side 110 of the line wall 11 of the tubular media line 10.In each of the embodiment variants shown in FIGS. 7 a, 7 band 8 a, 8 b, an outer layer 120, in particular a lacquer layer, is applied as a protective layer over the electrically conductive lacquer layer 15 in order to enable protection against chemical influences.By providing only two electrical conductors 7, 8 along the longitudinal extension of the media line, differing thermal expansions of the electrical conductors 7, 8 and of the media line 10 provided with the electrically conductive lacquer layer 15 can lead to twisting of the latter under the influence of temperature. In order to avoid this, instead of the only partially applied electrical conductors 7, 8, the foils 9, 19 already shown in FIG. 6 can be provided as electrical conductors, which are also shown in FIGS. 9 aand 9 b. As already mentioned, a current flow takes place here in the direction of the arrow P 3 perpendicular to the line wall 11 of the tubular media line 10. This can also be effected, for example, in turn by free-lasering or scraping of the desired contact point. Due to the foils 9, 19 as electrical conductors extending over the entire circumference of the tubular media line, the media line does not twist under the effect of temperature, since the heat is distributed uniformly over the circumference of the media line, i.e., no pointwise or partial mechanical load acts on the media line.In particular, the outer film 19 can be arranged over the lacquer layer 15 not only with an end face joint, as indicated in FIG. 9 a, i.e. without overlap, but also with an overlap of the end edges of the film, as indicated in FIG. 9 b. Depending on the film thickness, this results in a barely elevated or a more elevated overlap region. When the film 19 and thus the entire tubular media line 10 are covered with an outer protective layer, in particular the protective layer 120 or else a foam layer for insulation, such a slight excess increase no longer occurs after completion of the heatable media line, is compensated for if appropriate, and is therefore not adversely noticeable.As already explained above with respect to the electrical conductors 7, 8, in the case of the electrical conductors embodied in the form of foils 9, 19 as well, contacting with the electrical supply conductors 2, 3 can be effected by soldering, welding, adhesive bonding and injection molding.FIG. 10 shows a small detail of the line wall of the tubular media line 10 with paint layer 15 applied to it. The electrically conductive lacquer layer 15 does not have a uniform thickness over the longitudinal extent of the medium line, but rather a different layer thickness, wherein it continuously increases from a smaller layer thickness s 1 to a larger layer thickness s 2 in the illustration in FIG. 10. In principle, discontinuous layer thickness changes over the length of the medium line can also be provided in order to be able to introduce partially desired increased heat requirement thereby into the medium line or the medium flowing therein.FIG. 11 shows the development of the electrically conductive lacquer layer 15, wherein the latter is structured in particular by a laser in order to be able to introduce a different amount of heat through the line wall 11 of the tubular medium line 10 into the medium flowing through the inner cavity 12 thereof. In the embodiment shown in FIG. 11, the two conductors 7, 8 are indicated adjacent to the lacquer layer.The heating power can thus be varied by using different conductor tracks, by laser structuring of the lacquer layer 15 and by varying the geometry of the conductor tracks. Furthermore, it is possible to provide the electrically conductive lacquer layer 15 with a so-called PTC effect by appropriate selection of the electrically conductive fillers therein, so that the medium line reduces the current flow with increasing temperature, whereby the heating power decreases. Thus, the resistance increases and the current decreases.The tubular media line with the line connectors 13, 14 and 13, 18 arranged on the end side thereof can be bent in shape despite the provision of the lacquer layer 15 and the electrical conductors and can be finally mounted without problems with an insulating cladding tube, seals, such as in particular O-rings, and further devices.The end sides 112, 113 of the line wall 11 of the media line 10 are advantageously insulated from contact with the medium flowing through the media line in order to avoid loss of tightness due to damage and creep here. The media line 10 already provided with the lacquer layer 15 before the encapsulation with the line connectors can be partially freed from the lacquer layer before the encapsulation in order to enable a cohesive connection of the media line wall and the line connector material. Furthermore, the lacquer layer can be interrupted in order to allow a cohesive connection between line connector material and media line wall 11 there.Coextruded electrodes, as shown in FIGS. 12 to 15, can also be provided on the line connectors, i.e. they can be formed together with them or injected onto them, in order to provide heating of the line connectors. Accordingly, an electrically conductive paint, similar to the embodiment according to FIG. 1, can then likewise be applied to the outer side of the line connectors in order to be able to contact the paint through the electrodes provided there and accordingly to be able to heat after electrical supply conductors 2, 3 have been connected to the electrodes. Both on the outer side of the line connector and on the outer side of the media line, at least one non-conductive lacquer layer can be applied over the electrically conductive lacquer for external electrical insulation. Alternatively, wrapping with an insulating tape, such as in particular an adhesive tape, woven tape or woven adhesive tape, is also possible.In addition to the variants of pre-formed heatable media lines described above and shown in the figures, numerous further variants can be formed, in particular any combinations of the mentioned variants, in which a heatable media line provided with a line wall with an inner cavity is provided with at least one electrically conductive lacquer layer on its outer and / or inner side at least in one layer and is contacted via at least one electrical contacting device, in order to enable uniform or targeted heating of the media line and optionally also of the line connectors arranged on the end side thereof. Suitable contacting devices are in particular at least two electrical conductors which can be coextruded in particular with the media line.List of reference characters1 Ready-made heatable media line 2 electrical feed conductor 3 electrical feed conductor 4 electrical plug 5 electrical conductor 6 electrical conductor 7 electrical conductor 8 electrical conductor 9 electrical conductor / foil 10 tubular media line 11 line wall 12 inner cavity 13 straight line connector 14 angle line connector 15 electrically conductive lacquer layer 16 end section 17 SAE male plug 18 straight line connector 19 electrical conductor / foil 20 electrode 21 electrode 22 section electrically conductive lacquer 23 section electrically conductive lacquer 24 section electrically conductive lacquer 110 outer side 111 inner side 112 end side 113 end side 120 protective layer against chemical influences 130 end side section of 13 140 end side section of 14 141 non-directly heated section of 14 142 directly heated section of 14 150 outer side s 1 first layer thickness s 2 second layer thickness P 1 arrow / current flow direction P 2 arrow / current flow direction P 3 arrow / current flow direction b width a distance

Claims

Prefabricated heatable media line (1) having a hose- or tubular media line (10) and having at least one line connector (13, 14, 18) arranged at the end thereof, wherein the media line (10) has a line wall (11) and an inner cavity (12) surrounded by the line wall (11), wherein the line wall (11) has an outer side (110) and an inner side (111), wherein at least one device for heating the media line is provided, wherein the device for heating the media line is at least one electrically conductive paint (15) which is provided on the outer side (110) and / or inner side (111) of the line wall (11) at least in one layer and wherein the media line (10) for contacting the conductive paint (15) is provided with at least two electrical conductors which are in electrical contact with the electrically conductive paint (15), wherein the electrical conductors (5, 6, 7,8,9,19,20 21) are applied to the line wall (11) as a wire and / or film and / or stranded wire and / or conductor track and / or electrodes (20, 21) coextruded with the media line (10).Ready-made heatable media line (1) according to claim 1, characterised in that the electrically conductive lacquer (15) comprises at least one carbon modification, in particular carbon black, graphite, carbon nanotubes, and / or other electrically conductive particles for generating an electrical conductivity.Prefabricated heatable media line (1) according to claim 1 or 2, characterised in that the electrical conductors (5, 6, 7, 8) are applied as a metal film or conductor track on the line wall (11), in particular above or below the at least one layer of the at least one lacquer (15).Ready-made heatable media line (1) according to one of claims 1 to 3, characterised in that the electrical conductors (9, 19) are provided as continuous layers or as extruded electrodes (20, 21) above and below the lacquer (15) on the line wall (11).Prefabricated heatable media line (1) according to one of claims 1 to 4da characterised in that the heating power of the at least two electrical conductors (5, 6, 7,8,9,19,20 21) can be varied by targeted current supply to only individual conductor tracks or electrodes when more than two conductor tracks or coextruded electrodes (20, 21) are provided.Prefabricated heatable media line (1) according to one of the preceding claims, characterized in that the layer thickness (s 1, s 2) of the at least one lacquer layer (22, 23, 24) varies over the length of the media line (1) in order to compensate for power losses from electrical supply conductors (2, 3) over the length of the line and / or to enable a partially different heat input into the heatable media line (1).Prefabricated heatable media line (1) according to one of the preceding claims, characterized in that the heatable media line (1) is thermally and electrically insulated on the outside for ensuring functionality and reliable operation, in particular thermally by providing at least one cladding tube and / or protective cap enveloping the heatable media line (10) and / or its line connector (13, 14, 18) on the outside and / or an outer-side foam encapsulation, electrically by providing an insulating lacquer layer and / or by foaming the heatable media line and / or the at least one line connector (13, 14, 18).Ready-made heatable media line (1) according to one of the preceding claims, characterized in that a lacquer protection layer (120) is provided over the at least one electrically conductive lacquer layer (15) for protecting the electrically conductive lacquer against external chemical influences and / or for electrical insulation.Ready-made heatable media line (1) according to one of the preceding claims, characterized in that the media line (1) has a PTC effect, wherein the current flow is reduced and the heating power decreases as the temperature rises.Ready-made heatable media line (1) according to one of the preceding claims, characterized in that the electrically conductive lacquer (15) is elastic to a predeterminable extent and adheres to the surface of the line wall (11) and has a predeterminable breaking elongation in order to enable a shape bending of the heatable media line (1).Method for producing a pre-fabricated heatable media line (1) according to one of the preceding claims, characterized in that an electrically conductive paint (15) is sprayed on the outer and / or inner side (110, 111) of the line wall (11) of the media line (10) after the extrusion of the media line (10) and / or, after the extrusion of the media line (10), the latter passes through a paint bath of an electrically conductive paint (15) and / or an electrically conductive paint (15) is applied to the line wall (11) by a dipping method or application method and the electrically conductive paint (15) is electrically contacted by at least two electrical conductors, and, before or after the application of the electrically conductive paint (15), the media line (10) is provided at the end with at least one line connector (13, 14, 18).Method according to Claim 11, characterized in that the at least two electrical conductors (5, 6, 7,8,9,19,20 21) are applied to the line wall (11) by printing methods and / or liquid application and / or by vapour deposition and / or by winding and / or by spraying and / or by dipping and / or by coating and / or by coextrusion on the line wall (11) during the production of the media line (10).Method according to claim 11 or 12, characterised in that at least one line connector (13, 14, 18) is applied on the end side to the media line (10) by mandreling or welding or by injection moulding.Method according to one of Claims 11 to 13, characterized in that the prefabricated media line (10) is connected at the end to the at least one line connector (13, 14, 18), the media line connected to the at least one line connector (13, 14, 18) is bent in shape, and the electrically conductive paint (15) is applied to line connectors and / or media line after the bent in shape of the media line provided with the at least one line connector (13, 14, 18).Method according to one of Claims 11 to 14, characterized in that at least one thermally conductive material, in particular in the form of a sleeve and / or at least one metal foil, is applied or arranged on the media line (10) before the injection moulding, for the purposes of heat transport as far as the outer end of the line connector (14), in particular when forming an angle line connector.Method according to one of Claims 11 to 15, characterized in that the heating line of the at least two electrical conductors can be varied by varying the printing and / or winding of the line wall (11) with the electrical conductors (5, 6, 7, 8), in particular the spacings (a) between the conductor tracks or electrodes (20, 21) and / or the width (b) of the conductor tracks or electrodes (20, 21), or can be varied by laser structuring of the at least two electrical conductors (5, 6, 7, 8, 9, 19).Method according to one of Claims 11 to 16, characterized in that the at least one paint layer (15, 22, 23, 24) is laser-structured.

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