Method for coating a textile hose with a thermoplastic sealing material

Description

[0001] The invention relates to a method for coating a textile hose with a thermoplastic sealing material, wherein the textile hose has a longitudinal direction and a circumferential direction and is manufactured continuously in the longitudinal direction and in the circumferential direction, in particular is formed by a circular knit hose.

[0002] Textile hoses coated with thermoplastic sealing material have been used for some time for internal pipe rehabilitation, particularly in sewer and drain pipes, but also for other media-carrying piping. Typically, either a flat material is coated and then formed into a tubular or hose shape, which inevitably creates an annoying seam, or a circumferentially continuous round hose is folded into a flat, flat shape and coated on both sides, creating an uncoated or poorly coated area along the respective fold line.

[0003] DE 2137059 A discloses a device and method for producing plastic pipes or plastic hoses with a mesh-like or woven tubular reinforcing insert. This reinforcing insert is drawn from bottom to top over a vertically oriented mandrel supported from below with the tubular reinforcing insert interposed therebetween, and is coated and penetrated internally and externally with flowable plastic. The tubular or hose-shaped body drawn upwards above the mandrel is passed through a heating device provided there and hardened by heat. In contrast, the method in question here is intended to produce a hose that is converted into a typically flattened storage form or used directly to line another tubular body.

[0004] WO 01 / 58664 A1 discloses a method and apparatus according to which a rigid or flexible cylindrical body made of synthetic threads is first continuously produced by weaving outside and around a very short mandrel and then conveyed downwards in an axial direction. Thus, no hose is fed to the coating device and continuously drawn onto a mandrel extending longitudinally and approximately vertically; instead, the flexible cylindrical body is first formed around the short mandrel. The short mandrel is also held from above and is an integral part of a device for supplying liquid plastic. It comprises flow channels for meltable plastic that open from the inside onto the inside of the cylindrical body, so that the latter can be coated from the inside.After leaving the short mandrel, the internally coated cylindrical body is cooled from the inside with supplied air.

[0005] GB 1,081,417 A discloses a method and apparatus in which an extruded, i.e., non-textile, inner tube is fed and coated externally with hot-melt adhesive 4 in a roller nip. It is then expanded into a columnar shape by vertically oriented liquid filling or, alternatively, by a mandrel body. During the expansion, an outer casing layer is woven or knitted around the inner tube, and the two tube layers are bonded by the application of heat via the hot-melt adhesive. The tube is flattened again by two lower support rollers with a narrow roller nip, preventing any liquid from escaping.

[0006] US 3,418,404 A discloses a horizontal method and apparatus for forming a textile tube from an outer textile sheath and an inner textile layer. This assembly is passed horizontally over a mandrel through an extrusion device and embedded in plastic.

[0007] DE 10 2013 108 760 A1 discloses a device and a method for producing a textile hose. A textile hose is produced on-site from a plurality of threads and immediately subsequently inserted into the interior of a vertically positioned guide sleeve. At the lower end of the sleeve, a pear-shaped head interacts with an annular nozzle of an extrusion device to form an annular gap. The pear-shaped head is axially adjustable via a control rod that extends upwards through the guide sleeve to the outside, allowing the textile hose to be braked by clamping in the area of ​​the annular nozzle, but also allowing the annular gap to be adjusted.

[0008] Based on this, the present invention is based on the object of developing a process by means of which a textile hose coated largely uniformly with a thermoplastic sealing material can be produced in a continuous process in an economical and process-stable manner.

[0009] This object is achieved according to the invention by a method having the features of claim 1. The subject matter of the invention is therefore a method for coating a textile hose with a thermoplastic sealing material, in particular based on polyurethane, in a coating device, wherein the textile hose has a longitudinal direction and a circumferential direction and is manufactured continuously in the longitudinal direction and in the circumferential direction, in particular is formed by a circular knit hose, wherein the textile tube is fed to the coating device and is continuously drawn onto a mandrel extending in the longitudinal direction and approximately in the vertical direction from above and is continuously transported downwards over this mandrel, wherein the mandrel is supported and positionally oriented by at least one support means provided outside the textile tube, wherein the support means comprises a pair of support rollers and the mandrel is arranged and extended above the pair of support rollers so that it is supported with a lower longitudinal end on the pair of support rollers, which at least partially absorb a weight force of the mandrel, wherein the thermoplastic sealing material is provided in a heated, flowable state and is supplied to an entire outer circumference of the textile tube continuously transported over the mandrel in such a way thatthat the thermoplastic sealing material can partially penetrate into the textile hose and / or adhere to the outer circumference of the textile hose and forms a closed, flat coating, wherein the textile hose thus coated is then continuously pulled downwards by the mandrel, and wherein the mandrel has a cross-sectional change in the longitudinal direction between a lower and an upper longitudinal end in a region of the mandrel which is arranged upstream of the coating of the textile hose, so that a support collar is formed, and that the mandrel is supported on the support collar by a further support means provided outside the textile hose, i.e. in addition to the support of the mandrel at its lower end.

[0010] It is therefore proposed according to the invention that the textile hose to be coated is not coated in a flattened state, but that it is fed to an elongated mandrel which is approximately vertically oriented in the coating device and is mounted in a floating manner with the hose interposed, and is pulled onto this mandrel from above and continuously transported downwards over this mandrel and finally pulled off the mandrel again, this taking place in a continuous process and the textile hose is coated with the thermoplastic sealing material in the area of ​​the mandrel.Here, the mandrel and the hose surrounding it extend through a device for supplying molten thermoplastic sealing material to the outer circumference of the textile hose, and the continuously supplied textile hose is continuously guided through this device during the process and is coated from the outside with the thermoplastic sealing material. This also advantageously allows a coating with a substantially uniform coating weight per unit area to be realized, since, particularly when the mandrel is designed with a substantially cylindrical outer shape, a sleeve-shaped layer of uniform thickness can be readily provided and applied in the area where the coating is applied to the textile hose. This is already known from extrusion devices, in particular coextrusion devices, for producing or coating rigid pipes.

[0011] For the majority of applications, it is likely to be suitable and advantageous if the coated textile hose is pulled off the mandrel and transferred into a storage form. It is advantageous if the hose, which is continuously pulled off the mandrel, is converted back into a flat, folded form and then wound up, for example, into a roll or bale, or laid down in a Z-shape, i.e., laid back and forth in superimposed layers. However, it can also prove advantageous if the coated textile hose is pulled off the mandrel and immediately fed for further processing or treatment.

[0012] For example, it could be inserted directly into a tubular body to be lined. It is advantageous to insert the hose in an inverted state into the tubular body to be lined, so that its outer surface, coated with thermoplastic sealing material, then forms the inner surface of the lined tubular body.

[0013] In order to limit the longitudinal extent of the mandrel and the coating device, it is advantageous if the coated textile hose is cooled in the area of ​​the mandrel. This can advantageously be achieved by air cooling, for example by means of a ring with air outlet openings through which air can flow. The cooling or the supplied cooling power or the length of the cooling section and thus also the length of the mandrel after coating the textile hose should advantageously be selected such that the thermoplastic sealing material is cooled at least far enough that it is no longer plastically displaced or deformed in the area of ​​a mandrel support or in the area of ​​a withdrawal device acting on the textile hose. Cooling to, for example, below 35°C has proven advantageous in this case.

[0014] Because the mandrel rests with its lower longitudinal end on the pair of support rollers, the entire weight, or at least a large portion of it, of the mandrel, including the surrounding textile tube and the thermoplastic sealing material applied thereto, can be absorbed. However, according to the invention, additional support means are used that engage the outer circumference of the mandrel in a supporting manner. This will be explained below.

[0015] Furthermore, it may prove advantageous if the mandrel has an elongated mandrel body and, at its lower longitudinal end, a mold support body by means of which the mandrel is supported on the support means, in particular wherein the mold support body can be adjustable in the longitudinal direction with respect to the mandrel body. This mold support body can be formed integrally with the rest of the mandrel body, or it can be attached to the mandrel body as a separate body. This proves advantageous because the mold support body can be designed to be specifically complementary to a respective support means used in the device. It can also be made of a different material than the mandrel body. It can also be replaced with a new mold support body when it becomes worn, provided that it is advantageously provided so that it can be detachably attached to the mandrel body.If a length adjustability to the mandrel body is provided, for example by using a threaded spindle or by telescopic or other connecting means, a fine adjustment of the components of a coating device can be realized.

[0016] Furthermore, it proves to be advantageous if the mold support body interacts with the support means in such a complementary manner that the mandrel is not only supported vertically, but is additionally positionally stabilized in the lateral direction and / or in the circumferential direction of the mandrel.

[0017] In a further development of this idea, it proves advantageous if the mold support body is designed in some areas to approximately complement a tapered roll gap in a pair of backup rolls, so that it can partially engage in the roll gap and is thus positionally stabilized. This prevents the mandrel from twisting in the circumferential direction and thus stabilizes its position. It is also immovably positioned transversely to the roll gap in the lateral, i.e., horizontal, direction, thus also stabilizing its position.

[0018] According to a further idea, it is proposed that the mandrel at its lower end or the mold support body have at least one or preferably two rollers arranged parallel to one another, which, with the coated textile tube interposed, can roll against the support means for the mandrel, in particular against a pair of support rollers. This can reduce the resistance of the coated textile tube to slide over the mandrel and thus also to pull the coated textile tube off. This has the further advantage that less tensile forces need to be introduced into the textile tube.

[0019] According to the invention, as already mentioned, it is proposed that the mandrel has a cross-sectional change in the longitudinal direction between a lower and an upper longitudinal end, so that a support collar is formed, and that the mandrel is supported on the support collar by a support means provided outside the textile tube. This support, which acts on the outer circumference of the mandrel, is implemented, as already mentioned at the beginning, in addition to a support of the mandrel at its lower end. This support also takes place in a region of the mandrel which is arranged upstream of the coating of the textile tube. Such additional support on the outer circumference of the mandrel makes it possible to center the floating bearing of the mandrel within the coating device. The support, which acts on the outer circumference of the mandrel, can therefore be centering and / or supporting in the vertical direction.Preferably, the support is both centering and supporting in the vertical direction, i.e. load-bearing.

[0020] In a further development of this idea, it proves to be advantageous if the support means is formed by a pair of opposing support rollers, in particular by a first pair of support rollers and a second pair of support rollers which are arranged rotated by 90° relative to the first pair of support rollers in the vertical direction. It proves to be particularly advantageous if at least some of these support rollers can be designed to be adjustable transversely to the longitudinal extent of the mandrel. This facilitates the insertion and removal of the mandrel from the device and also the initial pulling of the textile tube over the mandrel. This also enables fine adjustment such that, depending on the thickness of the textile tube, an optimal play can be set for an arrangement of the mandrel within the coating device which is floating but nevertheless position-stabilized by the tube.

[0021] With regard to cost-effective storage and process management, it proves to be advantageous if the textile hose is provided and fed in a flat state and is expanded into a tunnel-shaped form within the coating device and pulled onto the mandrel.

[0022] It may also prove advantageous if a plurality of layers of thermoplastic sealing material are formed by coextrusion on the outer circumference of the textile tube continuously transported over the mandrel, wherein the plurality of layers are formed from different thermoplastic sealing materials in the sense that the plurality of layers differ with regard to at least one chemical or physical property. In this way, different properties of the plurality of layers can be realized through suitable material selection. In particular, the plurality of layers differ with regard to at least one chemical or physical property, in particular with regard to their stickiness or adhesion or with regard to their tightness or extensibility or tensile strength or tear resistance or wearability or elastic recovery capacity or sliding or friction values.

[0023] Furthermore, it proves to be advantageous if a thermoplastic polyester polyurethane (TPU), in particular with a Shore A hardness (determined according to DIN ISO 7613-1 3s) of at least 60 Shore A and at most 95 Shore A, in particular 80 - 95 Shore A, in particular 85-95 Shore A, in particular 90-93 Shore A, is used as the thermoplastic sealing material.

[0024] For example, a functional layer made of a hot-melt adhesive material can be used as the inner layer that comes into direct contact with the textile tube. This inner layer forms an adhesive bond of the layer composite to the textile tube of at least 1200 cN / cm. This layer preferably has a thickness of 5-50 µm, in particular 5-40 µm, in particular 5-30 µm, in particular 5-20 µm, and further in particular 5-15 µm.

[0025] It is further proposed that an externally adjoining layer be provided, which decisively determines the primary requirements with regard to impermeability and / or extensibility and / or tensile strength and / or tear resistance and / or wear resistance and / or elastic recovery of the coating. This typically middle layer preferably has a thickness of at least 50 µm, in particular of at least 70 µm, in particular of at least 80 µm, and more preferably of at most 500 µm, in particular of at most 400 µm, in particular of at most 300 µm, in particular of at most 250 µm, in particular of at most 200 µm, in particular of at most 180 µm. It is preferably based on a thermoplastic polyester polyurethane (TPU).

[0026] Finally, it has proven advantageous if an outer layer, typically as a third layer and furthermore typically based on a thermoplastic polyester polyurethane (TPU), is provided, which is designed with a view to setting optimal sliding and friction values. It then has a lower sliding and friction value than the layers adjacent to it on the inside. It can advantageously be designed with a rather small wall thickness of preferably at least 30 µm, in particular at least 4 µm, in particular at least 5 µm and furthermore in particular at most 20 µm, in particular at most 15 µm, in particular at most 10 µm. A wall thickness of 4-6 µm has proven sufficient for this layer.

[0027] The total thickness of the coating, which, as explained above, can consist of several coextruded layers, can advantageously be at least 70 µm, in particular at least 80 µm, in particular at least 90 µm, and further in particular at most 600 µm, in particular at most 500 µm, in particular at most 400 µm, in particular at most 300 µm, in particular at most 250 µm, in particular at most 200 µm, in particular at most 180 µm. In view of low material costs, low wall thicknesses are preferred.

[0028] The invention further relates to a coating device for carrying out the method described above with the features of claim 9.

[0029] The coating device according to the invention can further comprise a device, formed by the withdrawal device or arranged downstream of the withdrawal device, for transferring the coated textile hose into a storage form. A device for further processing or reuse of the coated hose could also be provided, in particular a device for introducing the coated textile hose into a tubular body to be lined.

[0030] It is further proposed that a cooling device is provided for cooling the textile hose coated with thermoplastic sealing material, wherein the cooling device is arranged downstream of the device for supplying molten thermoplastic sealing material to the outer circumference of the textile hose.

[0031] In order to facilitate the pulling of the hose over the mandrel, it is advantageous if the mandrel has an elongated mandrel body and is tapered at its upper end, and preferably rounded.

[0032] The mandrel preferably has a polished surface, in particular with a roughness of at most 0.3 Ra / µm, which can be determined, for example, according to DIN EN ISO 4287:1998.

[0033] It is also conceivable and advantageous for the mandrel to have a friction-reducing coating on its surface.

[0034] According to a further embodiment, the mandrel comprises an elongated mandrel body and, at its lower longitudinal end, a mold support body by means of which the mandrel can be supported on the support means, in particular wherein the mold support body can be adjusted in the longitudinal direction relative to the mandrel body. The mold support body can, in particular, be formed integrally with the mandrel. However, it proves advantageous if the mold support body is detachable from the elongated mandrel body, i.e., can be replaced when worn.

[0035] In a further embodiment, it can be provided that the mold support body has at least one or preferably two rollers arranged parallel to one another, which can roll against the support means for the mandrel, in particular against a pair of support rollers, with the coated textile tube interposed.

[0036] The aforementioned support means may also be formed by a pair of opposing support rollers, in particular by a first pair of support rollers and by a second pair of support rollers which is arranged offset by 90° with respect to the first pair of support rollers.

[0037] It proves to be advantageous that the feeding and transport device is designed in such a way that it feeds the textile tube in a flat state towards the mandrel and transports it further over the mandrel in the expanded state.

[0038] Furthermore, it proves to be advantageous that the device for supplying molten thermoplastic sealing material to the outer circumference of the textile hose is designed such that several layers of thermoplastic sealing material are formed on the outer circumference of the textile hose by coextrusion, wherein the several layers are formed in particular from different thermoplastic sealing materials.

[0039] Further features, details and advantages of the invention emerge from the appended patent claims and from the drawings and subsequent description of a preferred embodiment of the method according to the invention and the coating device according to the invention.

[0040] The drawing shows: Figure 1 shows a schematic representation of essential components of an embodiment of the coating device according to the invention and of a textile tube continuously conveyed through the coating device; Figure 2 shows a schematic representation of a further embodiment of a lower end region of a mandrel

[0041] Figure 1schematically illustrates some essential components of a coating device according to the invention, designated overall by the reference numeral 2, for coating an endlessly and continuously fed textile hose 4 with a thermoplastic sealing material 5, the thickness of which is not shown to scale in the figures but exaggerated for clarity. The most essential element of the coating device 2 according to the invention is an elongated, rod-shaped mandrel 6, onto which the hose 4 is continuously pulled, moved over the mandrel, and finally pulled off the mandrel again. The textile hose 4 has a longitudinal direction and a circumferential direction and is manufactured continuously in the longitudinal and circumferential directions, in particular in the form of a circular knit hose.In the area of ​​the mandrel 6, the longitudinal direction and the circumferential direction of the hose 4 coincide with a longitudinal direction and a circumferential direction of the mandrel 6.

[0042] The rod-shaped mandrel 6 is extended and aligned approximately in the vertical direction 8 and is simultaneously positionally stabilized. The mandrel is supported by several support means, each with the surrounding textile tube interposed.

[0043] A support means 10 is arranged below the mandrel 6. It is formed by two support rollers 12, which define a roller gap 14 between them, through which the hose is passed and pulled off the mandrel.

[0044] The mandrel 6 comprises an elongated, rod-shaped mandrel body 15 and a mold support body 16 attached to the elongated mandrel body 15 at its lower end, preferably detachably and preferably adjustable in the longitudinal direction of the mandrel. The adjustability is indicated by a dashed arrow. The mold support body 16 forms a tapered lower end of the mandrel 6 and, for this purpose, is designed, at least in some regions, to be approximately complementary to the roll gap 14 formed by the support rollers 12. In this way, a position-stabilized arrangement and support of the mandrel 6 on the support means 10 formed by the support rollers 12 can be achieved. The mandrel 6 is thus not only supported in the vertical direction 6, but also simultaneously position-stabilized in the horizontal direction 18.

[0045] Furthermore, the rod-shaped mandrel 6 has a cross-sectional change 20 further up such that its diameter and cross-section expand slightly towards the top, so that a rounded support collar 22 is formed by this cross-sectional change 20. In the area of ​​this support collar 22, a further pair of support rollers 24 is provided on opposite sides of the mandrel in the horizontal direction 18. At least one support roller 24 is preferably adjustable in the horizontal direction 18, so that fine adjustment and thus further positional orientation of the mandrel 6 can be achieved. The two support rollers 24 can also perform a support function acting in the vertical direction 8 when holding or floatingly supporting the mandrel 6, by supporting the mandrel 6 in the area of ​​the support collar 22 in the vertical direction as well.For this purpose, it proves advantageous if the rounded support collar 22 and the support rollers 24 have at least approximately and in sections a comparable curvature, so that the most extensive support possible is possible. This also facilitates the continuous transport of the textile tube 4 over the mandrel 6, i.e., between the mandrel 6 and the support rollers 24. It would also be conceivable for a further pair of support rollers to be arranged offset by 90° around the vertical direction 18 and to bear against the mandrel; these would then be behind or in front of the drawing plane of the figure.

[0046] For feeding, transporting, and removing the endless textile tube 4, which is continuous in the circumferential direction and is formed in particular from a circular knit tube, a feeding and transport device 26 is schematically indicated by two drive rollers 28, which roll against each other and, between them, form a roller gap 30. As can be seen schematically from the figure, the textile tube 4 can be fed to the coating device 2 in a flat, laid-flat state with lateral folded edges. It is fed to the roller gap 30 and, in the process, transported by the support rollers 24. Downstream of the drive rollers 28, the textile tube 4 is then guided onto and over the mandrel 6 and, in the process, brought into its essentially cylindrical shape. It proves advantageous for the mandrel 6 to have a tapered, yet rounded, upper end 32.The outer diameter of the mandrel and the diameter of the textile tube 4 should preferably be matched to one another in such a way that the tube 4 does not form longitudinal folds when pulled on, but that it is also not stretched, so that it does not contract again and form folds when subsequently pulled off the mandrel 6. The outer diameter of the mandrel and the natural, unstretched inner diameter of the textile tube 4 are therefore essentially identical.

[0047] In the vertical direction 8 below the upper support rollers 24, i.e., downstream of the upper support rollers 24 in a transport direction 34 of the textile tube 4, a device 36 for feeding molten thermoplastic sealing material 5 to an outer circumference 38 of the textile tube 4 is provided and is schematically indicated in the figure. This device 36 forms a through-opening extending in the vertical direction 8, through which the mandrel 6 extends with the textile tube 4 continuously transported thereabove. The device 36 cooperates with a device 40 for melting and providing flowable and thus extrudable thermoplastic sealing material 5 under an extrusion pressure, wherein a screw conveyor device 42 is schematically indicated in this device 40.

[0048] The device 36 for supplying molten thermoplastic sealing material 5 to the outer circumference 38 of the textile tube 4 is thus a tool designed to supply the molten thermoplastic material supplied by the device 40 and subjected to extrusion pressure to the outer circumference 38 of the tube 4 as evenly as possible. For this purpose, so-called circular distributors can be used in the device 36, which are designed to distribute an extrudable thermoplastic material substantially uniformly around the outer circumference of a sleeve to be coated, wherein the mandrel 6, with the textile tube pulled over it, functions as the sleeve of such an extrusion tool and is coated.It is also conceivable that the device 36 for supplying molten thermoplastic sealing material to the outer circumference of the textile hose is designed as a coextrusion tool, so that not just a single layer of thermoplastic sealing material, but several such layers can be formed concentrically one above the other. For this purpose, several devices 40 for melting and supplying thermoplastic sealing material are then arranged, preferably offset from one another in the circumferential direction around the mandrel 6, so that they can each be connected radially inwardly to the device 36 for supplying molten thermoplastic sealing material.

[0049] When the endlessly and continuously transported textile hose 4 is passed through the device 36, a single- or multi-layer extruded or co-extruded layer of thermoplastic sealing material 5 with preferably a substantially uniform coating weight per unit area is applied to the outer circumference 38 of the textile hose 4, so that the textile hose 4 leaving the device 36 has this layer of thermoplastic sealing material 5, which may then still be flowable.In order to stabilize this layer of thermoplastic sealing material, a schematically indicated cooling device 50 is provided downstream of the device 36 in the transport direction 34, which cooling device 50 preferably concentrically surrounds the mandrel 6 and supplies it with cooling air 52 flowing radially inwards, so that the thermoplastic sealing material 5 is cooled to temperatures of preferably below 35°C and in any case below a softening temperature of the thermoplastic sealing material when it leaves the area of ​​the cooling device 50.

[0050] The support rollers 12 mentioned above and a further take-off roller 54 form a take-off device 56 for taking off the coated textile hose 4. Downstream of the take-off device 56 or by means of the take-off device 56, the coated textile hose 4 can be transferred into a storage form. For this purpose, it can, in particular, be rolled up or wound into a roll or bale shape. However, it would also be conceivable for further processing or treatment of the coated textile hose 4 to be carried out downstream of the take-off device 56; in particular, the coated textile hose 4 could be introduced directly into a pipe to be internally lined.

[0051] Figure 2illustrates a further embodiment, according to which at the lower end of the mandrel 6 or, in the case shown here, at the mold support body 16 attached below, two preferably needle-bearing rollers 57 are provided on opposite sides of the mold support body 16, which roll against the respective support roller 12 with the coated textile tube 4 interposed therebetween. This allows the resistance when pulling off the coated tube 4 to be further reduced. Figure two views the mandrel 6 in the direction of arrow II in Figure 1 , wherein the textile hose 4 and the support rollers 12 are omitted.

[0052] With the present invention, it is not only possible to produce a textile hose, in particular for the intended use for the inner lining of pipes, more cost-effectively, but it is also possible to achieve an improvement in quality with regard to the uniformity of the coating with the thermoplastic sealing material.

Claims

1. A method for coating a textile hose (4) with a thermoplastic sealing material (5), in particular polyurethane-based, in a coating device (2), wherein the textile hose (4) has a longitudinal direction and a circumferential direction and is manufactured continuously in the longitudinal direction and in the circumferential direction, in particular is formed from a tubular knit hose, wherein the textile hose (4) is fed to the coating device (2) and is continuously drawn from top to down onto a mandrel (6) extending in the longitudinal direction and approximately in the vertical direction (8) and is continuously transported further downwards over this mandrel (6), wherein the mandrel (6) is supported and oriented in the correct position by at least one support means (10) provided outside the textile hose (4), wherein the support means (10) comprises a pair of support rollers (12, 24) and the mandrel (6) is arranged and extended above the pair of support rollers (12) so that it is supported on the pair of support rollers (12) with a lower longitudinal end which at least partially absorb a weight force of the mandrel, wherein the thermoplastic sealing material (5) is provided in a heated flowable state and is fed continuously to an entire outer circumference (38) of the textile hose (4) which is continuously transported over the mandrel (6) such that some of the thermoplastic sealing material (5) can penetrate into the textile hose (4) and / or can adhere to the outer circumference (38) of the textile hose (4) and forms a closed superficial coating, wherein the textile hose (4) coated in this way is then continuously drawn off downwards from the mandrel (6), and wherein the mandrel (6), in the longitudinal direction between a lower and an upper longitudinal end and in an area of the mandrel, which is arranged before coating the textile hose, has a cross-sectional change (20) so that a support collar (22) is formed as a result, and wherein the mandrel (6) is supported on the support collar (22) by a further support means (10), provided outside the textile hose (4) in addition to support of the mandrel at its lower end.

2. The method according to claim 1, characterized in that the coated textile hose (4) is transferred into a storage form, in particular transferred into a flattened folded form and then rolled up in a roll form or bale form or cuttled in a z-shaped manner, i.e., is laid down going back and forth in layers arranged one above the other, or is directly fed to further treatment or further use, in particular is introduced into a tubular body to be lined.

3. The method according to claim 1 or 2, characterized in that the textile hose (4) coated in this way is cooled while still in the region of the mandrel (6).

4. The method according to one or more of the preceding claims, characterized in that the mandrel (6) has an elongated mandrel body (15) and a form support body (16) at its lower longitudinal end, by means of which the mandrel (6) is supported on the support means (10), in particular wherein the form support body (16) can be adjustable in the longitudinal direction with respect to the mandrel body (15).

5. The method according to claim 4, characterized in that the form support body (16) interacts with the support means (10) in a complementary manner in such a way that the mandrel (6) is not only supported vertically, but is additionally positionally stabilized in lateral direction and / or in circumferential direction, in particular that the form support body (16) is formed approximately complementary to a tapering roller gap (14) in a pair of support rollers (12) so that it can partially engage the roller gap (14) and is thereby positionally stabilized.

6. The method according to one or more of the preceding claims, characterized in that the mandrel (6) at its lower end or the form support body (16) has at least one or preferably two rollers (57) arranged parallel to one another, which, under the interposition of the coated textile hose (4), can roll against the support means (10) for the mandrel (6), in particular against a pair of support rollers (12).

7. The method according to one of the preceding claims, characterized in that the support means (10) for supporting the mandrel at the suport collar (22) is formed by a pair of opposing support rollers (24), in particular by a first pair of support rollers (24) and by a second pair of support rollers (24) which is arranged offset by 90° with respect to the first pair of support rollers (24).

8. The method according to one or more of the preceding claims, characterized in that the textile hose (4) is provided and fed in a flattened state and is expanded within the coating device (2) into a tunnel-shaped form and is drawn onto the mandrel (6).

9. A coating device (2) for carrying out the method for coating a textile hose (4) with a thermoplastic sealing material (5) according to one or more of the preceding claims, comprising an elongated rod-shaped mandrel (6) and a support means (10) for supporting the mandrel (6) in a substantially vertical direction (8), wherein the mandrel (6) is located within the textile hose (4), wherein the support means (10) comprises a pair of support rollers (12, 24) and the mandrel (6) is arranged and extended above the pair of support rollers (12) so that it is supported on the pair of support rollers (12) with a lower longitudinal end which at least partially absorb a weight force of the mandrel, a feeding and transporting device (26) for feeding the textile hose (4) from above to the mandrel (6) and for continuously transporting the hose over the mandrel downwards, a device (36) for feeding melted thermoplastic sealing material (5) to the outer circumference (38) of the textile hose (4) in such a manner that the hose (4) is coated with substantially uniform coating surface weight, wherein the mandrel (6) extends, with the hose (4) which is continuously transported over the mandrel (6), through said device (36), a draw-off device (56) for drawing off the coated textile hose (4), and wherein the mandrel (6), in the longitudinal direction between a lower and an upper longitudinal end and in an area of the mandrel, which is arranged before coating the textile hose, has a cross-sectional change (20) so that a support collar (22) is formed as a result, and wherein the mandrel (6) is supported on the support collar (22) by a further support means (10), provided outside the textile hose (4) in addition to support of the mandrel at its lower end.

10. The coating device (2) according to claim 9, characterized by a device for transferring the coated textile hose into a storage form, or by a device for directly introducing the coated textile hose into a tubular body to be lined.

11. The coating device (2) according to claim 9 or 10, characterized in that a cooling device (50) is provided, for cooling the textile hose (4) coated with thermoplastic sealing material (5), wherein the cooling device (50) is arranged downstream of device (36) for feeding melted thermoplastic sealing material (5) to the outer circumference (38) of the textile hose (4).

12. The coating device (2) according to any of claims 9-11, characterized in that the mandrel (6) has an elongated mandrel body (15) and is formed in a manner tapered, and preferably rounded, at its upper end (32).

13. The coating device (2) according to any of claims 9-12, characterized in that the mandrel (6) has an elongated mandrel body (15) and a form support body (16) at its lower longitudinal end, by means of which the mandrel (6) is supported on the support means (10), in particular wherein the form support body (16) can be adjusted in the longitudinal direction with respect to the mandrel body (15).

14. The coating device according to claim 13, characterized in that the form support body (16) has at least one or preferably two rollers (57) arranged parallel to one another, which, under interposition of the coated textile hose (4), can roll against the support means (10) for the mandrel (6), in particular against a pair of support rollers (12).

15. The coating device according to one of claims 9-14, characterized in that the support means (10) for supporting the mandrel at the support collar (22) is formed by a pair of opposing support rollers (24), in particular by a first pair of support rollers (24) and by a second pair of support rollers (24) which is arranged offset by 90° with respect to said first pair of support rollers (24).

16. The coating device according to any of claims 9-15, characterized in that the feeding and transporting device (26) is designed such that it feeds the textile hose (4) in a flattened state in the direction of the mandrel (6) and transports it further over the mandrel (6) in the expanded state.