METHOD FOR COATING A TEXTILE HOSE WITH A THERMOPLASTIC SEALING MATERIAL

Abstract

The invention relates to a method for coating a textile hose (4) with a thermoplastic sealing material (5), in particular polyurethane-based, in a coating device (2). 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 formed from a tubular knit hose; the textile hose (4) is fed to the coating device (2) and is continuously drawn onto a mandrel (6) extending in the longitudinal direction and approximately in the vertical direction (8) and is continuously transported further over this mandrel (6), the mandrel (6) being supported and oriented according to the position by at least one support means (10) provided outside the textile hose (4). 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) in such a way 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, and the textile hose (4) coated in this way is then continuously drawn off from the mandrel (6).

Claims

1. A method for coating a textile hose (4) with a thermoplastic sealing material (5), 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 and, wherein the method comprises: feeding textile hose (4) to the coating device (2); drawing the textile hose (4) continuously onto a mandrel (6) extending in the longitudinal direction and approximately in the vertical direction (8); transporting the textile hose (4) continuously further over this mandrel (6), wherein the mandrel (6) is supported and oriented according to the position by at least one support means (10) provided outside the textile hose (4), providing thermoplastic sealing material (5) in a heated flowable state feeding the thermoplastic sealing material continuously to an entire outer circumference (38) of the textile hose (4) which is continuously transported over the mandrel (6) in such a-way that some of the thermoplastic sealing material (5) is capable of penetrating into the textile hose (4) and/or is capable of adhering to the outer circumference (38) of the textile hose (4) and forms a closed superficial coating thereon; and, drawing off the textile hose (4) coated in this way continuously from the mandrel (6).

2. The method of claim 1, further comprising transferring the coated textile hose (4) into a storage form, or the coated textile hose (4) is directly fed to further treatment or further use.

3. The method of claim 1 further comprising cooling the coated textile hose (4) while still in the region of the mandrel (6).

4. The method of claim 1 wherein the support means (10) comprises at least one support roller (12, 24) which at least partially absorbs a weight force of the mandrel.

5. The method of claim 1, wherein the support means (10) comprises a pair of support rollers (12), 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.

6. The method of claim 1, wherein 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).

7. The method of claim 6, wherein 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.

8. The method of claim 7, wherein 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.

9. The method of claim 1 wherein the mandrel (6) at its lower end or the form support body (16) has at least one roller (57) which, under the interposition of the coated textile hose (4), are capable of rolling against the support means (10) for the mandrel (6).

10. The method according to claim 1 wherein the mandrel (6), in the longitudinal direction, has a cross-sectional change (20) between a lower and an upper longitudinal end so that a support collar (22) is formed as a result, and in that the mandrel (6) is supported on the support collar (22) by a support means (10) provided outside the textile hose (4).

11. The method of claim 10, wherein the support means (10) 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).

12. The method of claim 1, wherein the support means (10) comprises a ring element (60) which forms a rounded inlet for the mandrel (6) and the hose (4).

13. The method of claim 1 wherein the feeding of the textile hose (4) is provided in a flattened state and is expanded within the coating device (2) into a tunnel-shaped form prior to being drawn onto the mandrel (6).

14. The method of claim 1 wherein the feeding of the thermoplastic sealing material further comprises feeding a plurality of layers of thermoplastic sealing materials, which layers are formed by coextrusion on the outer circumference (38) of the textile hose (4) which is transported continuously over the mandrel (6), and wherein the plurality of layers are formed of different thermoplastic sealing materials which differ with respect to at least one chemical or physical property.

15. The method of claim 1, wherein the thermoplastic sealing material is a thermoplastic polyester polyurethane (TPU).

16. A coating device (2) for carrying out the method of claim 1, 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), a feeding and transporting device (26) for feeding the textile hose (4) to the mandrel (6) and for continuously transporting the hose over the mandrel, 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) extents, with the hose (4) which is continuously transported over the mandrel (6), through said means (36), a draw-off device (56) for drawing off the coated textile hose (4).

17. The coating device (2) of claim 16, further comprising a device for transferring the coated textile hose into a storage form, or a device for directly introducing the coated textile hose into a tubular body to be lined.

18. The coating device (2) according to claim 16 further comprising a cooling device (50) 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).

19. The coating device (2) of claim 16, wherein the support means (10) comprises at least one support roller (12) which at least partially absorbs a weight force of the mandrel (6).

20. The coating device (2) of claim 16 wherein the support means (10) comprises a pair of support rollers (12), and the mandrel (6) is arranged and extended above the pair of support rollers (12) such that it is supported on the pair of support rollers (12) with a lower longitudinal end.

21. The coating device (2) of claim 16, wherein the mandrel (6) has an elongated mandrel body (15) and is formed in a manner tapered, at its upper end (32).

22. The coating device (2) of claim 16, wherein the mandrel (6) has a polished surface.

23. The coating device (2) of claim 16 wherein the mandrel (6) has a friction-reducing coating on its surface.

24. The coating device (2) of claim 16 wherein 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).

25. The coating device of claim 24 wherein the form support body (16) has at least one roller (57) which, under interposition of the coated textile hose (4), can roll against the support means (10) for the mandrel (6).

26. The coating device of claim 16 wherein the mandrel (6), in the longitudinal direction, has a cross-sectional change (20) between a lower and an upper longitudinal end so that a support collar (22) is formed as a result, and in that the mandrel (6) can be supported on the support collar (22) by a support means (10) provided outside the textile hose (4).

27. The coating device of claim 26, wherein the support means (10) is formed by a pair of opposing support rollers (12, 24).

28. The coating device of claim 16, wherein the support means (10) is formed by a ring element (60) which forms a rounded inlet for the mandrel (6) and the hose (4).

29. The coating device of claim 16, wherein 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.

30. The coating device of claim 16, wherein the device (36) for feeding melted thermoplastic sealing material (5) to the outer circumference (38) of the textile hose (4) is designed to form by coextrusion a plurality of layers of thermoplastic sealing material (5) on the outer circumference (38) of the textile hose (4).

Description

[0044] In the drawings:

[0045] FIG. 1 is a schematic representation of essential components of an embodiment of the coating device according to the invention and a textile hose continuously conveyed through the coating device;

[0046] FIG. 2 is a schematic representation of another embodiment of a lower end region of a mandrel; and

[0047] FIG. 3 is a schematic representation of the support of the mandrel by means of an annular support element in another embodiment

[0048] FIG. 1 schematically illustrates some essential components of a coating device according to the invention, designated overall by the reference numeral 2, for coating an endless 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 shown with exaggerated thickness for better perception. The most essential element of the coating device 2 according to the invention is formed by an elongated rod-shaped mandrel 6, onto which the hose 4 is continuously drawn and moved over the mandrel and finally drawn off the mandrel again. 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 formed as a tubular knit hose. In the region of the mandrel 6, the longitudinal direction and the circumferential direction of the hose 4 correspond to a longitudinal direction and a circumferential direction of the mandrel 6.

[0049] The rod-shaped mandrel 6 extends and is aligned approximately in the vertical direction 8 while at the same time being positionally stabilized. In this case, the mandrel is supported by a plurality of support means, each of which is supported under the interposition of the textile hose surrounding it.

[0050] A support means 10 is arranged below the mandrel 6. It is formed by two support rollers 12 which delimit between them a roller gap 14 through which the hose is guided and drawn off the mandrel.

[0051] The mandrel 6 comprises an elongated rod-shaped mandrel body 15 and a form support body 16 attached to the elongated mandrel body 15 at its lower end, which is preferably detachable and preferably adjustable in the longitudinal direction of the mandrel. The adjustability is indicated by a dashed arrow. The form support body 16 forms a tapering lower end of the mandrel 6 and, for this purpose, is formed approximately complementary to the roll gap 14 formed by the support rollers 12, at least in certain areas. In this way, a positionally stabilized arrangement and support of the mandrel 6 can be achieved on the support means 10 formed by the support rollers 12. The mandrel 6 is thus not only supported in the vertical direction 6, but also positionally stabilized in the horizontal direction 18.

[0052] Furthermore, the rod-shaped mandrel 6 has a cross-sectional change 20 further above in such a way that its diameter and cross-section widen somewhat towards the top so that a support collar 22 which is formed in a rounded manner is thereby formed by this cross-sectional change 20. In the region of this support collar 22, another pair of support rollers 24 is provided on opposite sides of the mandrel in the horizontal direction 18. At least one support roller 24 can be adjusted preferably in the horizontal direction 18 so that a fine adjustment and thus a further positional orientation of the mandrel 6 can be achieved. However, the two support rollers 24 can also perform a support function acting in the vertical direction 8 during the mounting or also floating mounting of the mandrel 6 by also supporting the mandrel 6 in the vertical direction in the region of the support collar 22. For this purpose, it proves to be advantageous if the rounded support collar 22 and the support rollers 24 have at least approximately and in sections a comparable curvature, so that support can be provided over as large an area as possible.

[0053] This also facilitates the continuous further transporting of the textile hose 4 over the mandrel 6, i.e., between the mandrel 6 and the support rollers 24. It would also be conceivable for another pair of support rollers to be arranged offset by 90 about the vertical direction 18 and rest against the mandrel; these would then be behind or in front of the drawing plane of the figure.

[0054] For feeding, transporting and removing the textile hose which is endless and in the circumferential direction 4 continuous, which is formed in particular by a tubular knit hose, a feeding and transporting device 26 is indicated schematically by two drive rollers 28 which roll against one another and in turn form a roller gap 30 between them. As can be seen schematically from the figure, the textile hose 4 can be fed to the coating device 2 in a flattened state with lateral folding edges. It is fed to the roller gap 30 and thereby transported through the support rollers 24. Downstream of the drive rollers 28, the textile hose 4 is then guided onto and over the mandrel 6 and is thereby brought to its substantially cylindrical shape. Here, it has proven to be advantageous for the mandrel 6 to have a tapering but rounded upper end 32. The outer diameter of the mandrel and the diameter of the textile hose 4 are preferably to be matched to one another in such a way that the hose 4 does not form longitudinal folds when it is drawn onto, but that it is not stretched either, so that it does not contract again and form folds when it is subsequently drawn off the mandrel 6. Thus, the outer diameter of the mandrel and the natural unstretched inner diameter of the textile hose 4 essentially correspond to one another.

[0055] 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 hose 4, a device 36 for feeding melted thermoplastic sealing material 5 to an outer circumference 38 of the textile hose 4 is provided and schematically indicated in the figure. This device 36 forms a through opening extending in the vertical direction 8, through which the mandrel 6 with the textile tube 4 continuously transported over it extends through. The device 36 interacts with a device 40 for melting and providing a flowable and thus extrudable thermoplastic sealing material 5 under an extrusion pressure, wherein a screw conveyor device 42 is schematically indicated at this device 40.

[0056] Thus, the device 36 for feeding melted thermoplastic sealing material 5 to the outer circumference 38 of the textile hose 4 is a tool designed to feed the melted thermoplastic material fed by the device 40 and under extrusion pressure as uniformly as possible to the outer circumference 38 of the hose 4. For this purpose, so-called circular distributors can be used with the device 36, which are designed to distribute an extrudable thermoplastic material around an outer circumference to be coated of a quill in a substantially uniform manner, wherein the mandrel 6 with the textile hose drawn over it acts as a quill of such an extrusion tool and is coated. It is also conceivable that the device 36 for feeding melted thermoplastic sealing material to the outer circumference of the textile hose is formed as a coextrusion tool so that not only a single layer of thermoplastic sealing material but a plurality of such layers can be formed concentrically one above the other. For this purpose, several devices 40 for melting and feeding thermoplastic sealing material preferably in the circumferential direction about the mandrel 6 are then arranged offset from one another so that they can each be connected radially inwards with the device 36 for feeding melted thermoplastic sealing material.

[0057] When guiding through the endless and continuously transported textile hose 4 through the device 36, a single- or multi-layer extruded or co-extruded layer of thermoplastic sealing material 5 with preferably substantially uniform coating surface weight is applied to the outer circumference 38 of the textile hose 4, so that the textile hose 4 exiting the device 36 has this layer of then possibly still flowable thermoplastic sealing material 5. 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 preferably concentrically surrounds the mandrel 6 and acts upon 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 exits the region of the cooling device 50.

[0058] The support rollers 12 mentioned at the outset and a further draw-off roller 54 form a draw-off device 56 for drawing off the coated textile hose 4. After the draw-off device 56 or by means of the draw-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 form. However, it would also be conceivable for further processing or treatment of the coated textile hose 4 to be carried out downstream of the draw-off device 56, in particular the coated textile hose 4 could be inserted directly into a pipe to be lined internally.

[0059] FIG. 2 illustrates a further embodiment according to which at the lower end of the mandrel 6 or, in the case shown here, in the case of the form support body 16 attached from below, in particular two preferably needle-mounted rollers 57 on opposite sides of the form support body 16 are provided, which, under the interposition of the coated textile hose 4, roll against the respective support roller 12. As a result, the resistance when the coated hose 4 is drawn off can be further reduced. Figure two views mandrel 6 in the direction of arrow II in FIG. 1, wherein the textile hose 4 and the support rollers 12 are omitted.

[0060] FIG. 3 schematically shows an embodiment in which, in the region of the lower end of the mandrel 6, instead of the support rollers 12 shown in FIG. 1, a ring element 60 formed with a rounded inner surface 58 is provided as a support means 10 for the mandrel 6. This ring element 60 forms a funnel, so to speak, on the inner wall or inner surface 58 of which the mandrel 6 is supported and at the same time is positionally stabilized in the horizontal direction 18 towards all sides. As in the first embodiment, the coated textile hose 4 is interposed between the mandrel 6 and the ring element 60, i.e., guided through between the mandrel 6 and the ring element 60. Thus, it extends through the ring element 60 and, as in the embodiment according to FIG. 1, is drawn off from the lower end of the mandrel 6. Here, it proves to be advantageous if the lower end of the mandrel 6 or of the form support body 16 and the inner surface 58 of the ring element 60 are formed at least in sections with a corresponding curvature or complementary to one another, so that a flat abutment and support of the mandrel 6 can be achieved, so that the resistance when drawing through the coated textile hose 4 can be kept as low as possible. As already mentioned at the outset, such a support element in the form of a ring element 60 could also be provided for supporting the mandrel 6 at its outer circumference further above, in particular in the region of a support collar, in particular as an alternative to the support rollers 24 of the embodiment example according to FIG. 1 engaging at the outer circumference 38 and in particular in addition to a support at the lower end of the mandrel 6.

[0061] With the present invention, it is not only possible to manufacture a textile hose more cost-effectively, in particular for the intended use for the inner lining of pipes, but it is also possible to achieve an improvement in quality with regard to the uniformity of the coating with the thermoplastic sealing material.