TUBE-SHAPED LINER

Description

[0001] The invention relates to a tubular liner for the rehabilitation of pipelines and channels, a cured liner, a method for producing a liner, the use of the liner, a method for the rehabilitation of pipelines and channels, and a rehabilitated pipeline or channel.

[0002] Most solutions for tubular liners for the rehabilitation of pipelines or sewers describe fiber layers with fibers in a random arrangement (e.g. nonwovens or cut roving) or fibers that are aligned lengthwise of the liner to improve the mechanical properties in the longitudinal direction or the necessary stability for pull-in liners. Fibers can generally be aligned circumferentially, i.e. perpendicular to the longitudinal direction of the liner, to improve the mechanical properties of the liner in the circumferential direction. To date, this has been achieved by either aligning very short fiber sections in the circumferential direction, which were usually laid overlapping. Such liners then often have a longitudinal seam and are therefore less stretchable in the circumferential direction. Or continuous fibers were aligned circumferentially, extending essentially around the entire circumference of the liner.With these solutions, the outermost mat had to be connected along the longitudinal edge. This limited the circumferential expansion capacity. These solutions have the disadvantage that the liner is less able to expand or even not expand at all when installed in the pipeline to be renovated, meaning the cured liner does not fit properly against the old pipe.

[0003] US6615875B2 describes a liner for reinforcing a pipe and a method for its manufacture.

[0004] DE102014114746A1 describes a liner for sewer rehabilitation.

[0005] The object of the present invention is therefore to overcome these disadvantages of the prior art and to provide a technology with which liners are obtained which have good mechanical properties even in the circumferential direction and yet are sufficiently stretchable to better fit the old pipe of the lines to be renovated.

[0006] The object underlying the invention is therefore achieved by a tubular liner for the rehabilitation of pipes and channels, which comprises resin-impregnated fiber layers, wherein at least one fiber layer is a transverse fiber layer which (predominantly) has fibers arranged at an angle in a range of 45° to 135° relative to the longitudinal direction of the liner, wherein these fibers of the transverse fiber layer arranged in this way predominantly have a median length in a range of 20 to 50% of the circumference of the liner.

[0007] Several layers can form a mat. For example, a mat can consist of a layer of direct roving, a cross-fiber layer, and a layer of cut roving. These layers can be sewn together.

[0008] The liner according to the invention has the advantage that it is more flexible and requires less working pressure. Working pressure, as defined by the invention, is the pressure maintained during installation to press the liner against the old pipe. Furthermore, the increased flexibility of the liner allows for the visibility of side inlets, such as service connections, in the rehabilitated pipe ("dimples"), making them easier to identify.

[0009] The word "predominantly" in the sense of the invention means more than 50 wt.% when referring to mass.

[0010] "Outside" in the context of the invention means the inner pipe wall facing the pipeline or sewer to be rehabilitated. "Inside" in the context of the invention means the inner pipe wall facing away from the pipeline or sewer to be rehabilitated. This is important because, for example, there are so-called "retraction liners," in which the outermost layer is on the outside before and after installation. However, there are also so-called "inversion liners," in which an initially inner layer in the rehabilitated pipeline or sewer is on the outside. Layers of the liner

[0011] The liner can have at least one outer layer (e.g., light-protection film, outer film, etc.). The outer layer can have a monomer barrier layer. This monomer barrier layer is intended to prevent the diffusion of reactive diluents such as styrene from the uncured resin system. The outer layer preferably has a thickness in the range of 40 to 2000 µm. The outer layer is advantageously not permeable to UV radiation so that the resin system in the resin-impregnated fiber layer does not harden, for example, during storage or transport. The outer layer can consist of a polymer, for example, or of a nonwoven with a laminated polymer. Suitable materials for the polymer and / or nonwoven include, for example, polyester, polyamide, polyvinyl chloride, polyacrylonitrile, polyethylene, polypropylene, and / or mixtures thereof.

[0012] The liner can have at least one anchoring layer. The anchoring layer, which is preferably made of a thermoplastic material, preferably has a thickness in a range of 10 to 5000 µm, in particular 30 to 500 µm. The anchoring layer advantageously consists of a nonwoven or a hot-melt adhesive, or a combination of these variants. The nonwoven is most preferably made of glass, thermoplastic materials, PAN, or mixtures thereof. The thermoplastic materials are selected, for example, from polyethylene, polypropylene, or polyester. The hot-melt adhesive is, for example, polyamide, polyethylene, APAO (amorphous polyolefin), EVAC (ethylene-vinyl acetate copolymer), TPE-E (polyester elastomer), TPE-U (polyurethane elastomer), TPE-A (copolyamide elastomer), or vinylpyrrolidone / vinyl acetate copolymer, as well as mixtures thereof.

[0013] The liner can have an inner layer. The inner layer can have a monomer barrier layer. The inner layer advantageously has a thickness in a range of 100 to 1500 µm. In particular, the inner layer has a thickness in a range of 100 to 600 µm. This allows this inner layer to be protected from mechanical damage, for example, by the device for curing the resin-impregnated fiber layer, but is still thin enough to allow sufficient heat or UV radiation to pass through for curing. This inner layer advantageously has multiple layers. One of these layers is, for example, a monomer barrier layer. This monomer barrier layer is intended to prevent the diffusion of reactive diluents such as styrene from the uncured resin system.This monomer barrier layer is advantageously one of the layers of the inner layer that is not located on the outside ("outside" here means "visible to the observer" and / or "adjacent to the anchoring layer"). The monomer barrier layer contains, for example, at least 50 wt.% and particularly preferably consists of polyamide, ethylene-vinyl alcohol copolymer, PBT, PET, halogenated polymers, or mixtures thereof. The monomer barrier layer particularly preferably consists of one or more of these materials. The monomer barrier layer advantageously has a thickness in a range of 10 to 500 µm.

[0014] The inner layer advantageously comprises at least one and advantageously two outer layers ("outer" here means "visible to the observer" and / or "adjacent to the anchoring layer") made of polyurethane, polyethylene, or polypropylene. This outer layer advantageously has a thickness in a range of 50 to 1000 µm. For example, the outer layer adjacent to the anchoring layer (for example, as an adhesive layer) can be thinner than the other outer layer facing the center of the hose (namely, for example, a wear layer). This allows the inner layer to provide even better protection against mechanical influences.

[0015] Preferably, at least the anchoring layer and the inner layer are bonded to each other by a material fit or force fit. Because at least these two layers are bonded to each other, these layers cannot move relative to each other. This significantly improves the stability of the entire layer structure. Furthermore, the inner layer is significantly reinforced by the bonded anchoring layer, so that it is no longer easily damaged.

[0016] In the context of the invention, "cohesive or force-fit" can advantageously mean that the respective layers are either fully or partially laminated, bonded, or glued to one another. If the layers are partially bonded to one another, preferably at least 40% of the surface area of ​​the layers is bonded to one another or, alternatively, connected at specific points. In this way, slippage of the layers relative to one another can be completely prevented. The layers can additionally or alternatively be bonded in such a way that a highly flowable thermoplastic material is extruded between the layers during production.

[0017] Preferably, a layer of polyethylene, polypropylene, or polyurethane is located at the very inside, toward the center of the pipe, as the outer layer of the inner layer. The monomer barrier layer is advantageously located adjacent to this as the inner layer. Advantageously, a layer of polyethylene or polypropylene can be provided between the anchoring layer and the monomer barrier layer as a further layer of the inner layer.

[0018] The liner may have several fiber layers, including at least one cross-fiber layer. Fiber layers

[0019] The fibers may preferably be fibers made of glass, carbon, polymer, cellulose or mixtures thereof, but most preferably glass.

[0020] The fiber layers, or at least one fiber layer, can consist of material webs that are joined together at their longitudinal edges. This joining can be achieved, for example, by sewing or needling. In this way, tubular fiber layers can be created. However, the fiber layers can also simply be laid together to form a tubular structure in an overlapping manner, without being joined in the overlapping area. Preferably, the outermost fiber layer facing the inner pipe wall is joined together at its longitudinal edges (for example, by overlapping and then needling). At least one mat can also be joined together at the longitudinal edge. Preferably, the outermost mat facing the inner pipe wall is joined together at its longitudinal edges (for example, by overlapping and then needling). A mat can have multiple fiber layers.These fiber layers can be, for example, cross-fiber layers, layers of direct roving, or layers of cut roving. A mat can also consist of at least one material web, in which case the material web can comprise multiple fiber layers.

[0021] The adjacent fiber layers or adjacent mats can differ from each other in that the longitudinal edges of the material webs are offset.

[0022] The fibers can, for example, consist of bundles of filaments.

[0023] The fiber layer is preferably a scrim, a woven fabric, a random-fiber mat, a knitted fabric, a nonwoven, a felt, a warp-knitted fabric, or a combination or multi-layer structure of these textile fabrics. For example, a cross-fiber layer can also contain cut roving in the same layer. A fiber layer can also contain different types of fibers (e.g., polymer fibers, glass fibers, carbon fibers, etc.). For example, a nonwoven can be combined with a scrim in one layer.

[0024] The mats can preferably each have a basis weight in a range of 200 to 3000 g / m 2 , more preferably in a range of 400 to 2600 g / m 2 , and most preferably in a range of 700 to 1800 g / m 2 . The fiber layers can preferably each have a basis weight in a range of 50 to 1000 g / m 2 , more preferably in a range of 100 to 900 g / m 2 , and most preferably in a range of 200 to 600 g / m 2 .

[0025] The liner can preferably comprise 1 to 20 mats, particularly preferably 2 to 15 mats. The liner can preferably comprise 3 to 60 fiber layers, particularly preferably 6 to 45 fiber layers.

[0026] The material for the resin system can be selected from the group of unsaturated polyester resins, vinyl ester resins, epoxy resins, or mixtures thereof.

[0027] In the resin-impregnated fiber layer, the resin system is preferably not or only partially polymerized (before installation). After installation, the resin can be fully polymerized. The composition of the resin system advantageously contains 0.1 to 20 parts by weight of a thickener (such as isocyanate, metal hydroxides, metal oxides such as magnesium oxide or calcium oxide, or minerals such as kaolin, or mixtures thereof), and in particular of an isocyanate, based on 100 parts by weight of resin system. It has been found that this results in the composition of the resin system being sufficiently thickened when used in the rehabilitation of pipes, but is liquid enough during production to completely impregnate the anchoring layer or the inner fleece and the fiber layer.At least the outermost fiber layer or mat is preferably joined along the longitudinal edge (e.g., overlapped and needled, glued, quilted, or sewn). Preferably, the outermost mat comprises a needled fabric. The outermost mat may, but need not, contain a cross-fiber layer. Cross-fiber layer

[0028] At least one of the fiber layers is a transverse fiber layer.

[0029] The at least one transverse fiber layer preferably differs (predominantly) from an adjacent fiber layer in the arrangement of the fibers, the material of the fibers, the median length of the fibers, and / or the basis weight of adjacent layers. The at least one transverse fiber layer can also differ from an adjacent fiber layer in that the connection or overlap (or even overlap and connection) of the longitudinal edges of the material webs is offset in the circumferential direction.

[0030] According to the invention, the transverse fiber layer predominantly comprises (particularly preferably at least 60 wt.%) fibers arranged at an angle in a range of 45° to 135°, particularly preferably 80° to 100°, relative to the longitudinal direction of the liner. The basis weight of these fibers in the transverse fiber layer can preferably be in a range of 50 to 1000 g / m².

[0031] The cross-fiber layer or mat may also comprise fibers oriented at +20° to -20° relative to the longitudinal direction. The basis weight of these fibers in the cross-fiber layer or mat may preferably be in the range of 50 to 1000 g / m².

[0032] The cross-fiber layer or mat may also contain cut roving (e.g., CSM). The areal weight of these fibers in the cross-fiber layer or mat may preferably be in the range of 50 to 1000 g / m².

[0033] The cross-fiber layer or mat can preferably comprise a scrim. The scrim preferably has a width in a range of 90 to 110% of the circumference of the liner. The scrim preferably has the length of the liner. Alternatively, and particularly for very long liners, the liner can also consist of several connected scrims. The scrim is preferably joined together at both longitudinal edges of the scrim (for example, by sewing or needling, either butt-jointed or overlapping), especially if it is the outermost cross-fiber layer. This creates a tubular cross-fiber layer or mat.

[0034] At least one transverse fiber layer preferably predominantly (particularly preferably at least 50% by weight, most preferably at least 60% by weight) fibers which are oriented at an angle in a range from 45° to 135° relative to the longitudinal direction of the liner and which are severed at at least one point, preferably at least 2 points, more preferably at 1 to 10 points, per fiber. These severance points are preferably at a distance from the fiber end in a range from 5 to 100 cm, particularly preferably in a range from 10 to 50 cm. These severance points are preferably at a distance from the fiber end in a range from 2 to 20% of the circumference of the liner, particularly preferably in a range from 5 to 15% of the circumference of the liner.Alternatively, these severance points are at least a distance a = (circumference / (number+1)) - 40% from the fiber end or the adjacent severance point, where circumference is the circumference of the liner and number is the number of severance points. The severances (e.g. cuts) can also be randomly arranged and have a random length. The number of severances per area and length of the severances reaches its limit where the material can no longer be processed. Preferably, the severances (e.g. cuts) are grouped. The fibers of the transverse fiber layer are preferably severed by cuts in the longitudinal direction of the liner, each with a length of 0.5 to 50 cm. The fibers of the transverse fiber layer are severed, for example, over a length of 0.5 to 50 cm, particularly preferably 2 to 10 cm, for example by cuts in the longitudinal direction of the liner at the same point in the circumferential direction.At the same point in the circumferential direction means that there is essentially a cutting line running the length of the liner with cuts that lie on this cutting line. This can be achieved, for example, by cutting tools that are lowered into the fibers with the cutting tool and then removed from the fibers again. This can be done, for example, by cuts through the fibers of the cross-fiber layer in the longitudinal direction of the liner. The separations or cuts can lie along one or more cutting lines, which preferably run in the longitudinal direction of the liner (the cutting lines can also have a different angle). The fibers of the cross-fiber layer can be severed in evenly or unevenly spaced cuts along a cutting line. Adjacent cuts with the same cutting length are preferably spaced a distance of one spacing length from one another.The median of the spacing length of the cuts along a cutting line is preferably shorter than the median of the cutting length of the cuts. The median of the spacing length is preferably in a range of 20 to 70% of the median cutting length. The positions in the circumferential direction of the cuts (or cuts) of the groupings of cuts adjacent in the longitudinal direction of the liner are preferably spaced by 10 to 40% of the circumference of the liner. The number of cutting lines in the longitudinal direction of the liner is preferably in a range of 1 to 12, very particularly preferably in a range of 2 to 6. These features describing the fiber layer, in particular relating to cutting, can also relate to a mat. A mat consisting of several fiber layers can therefore also have cuts.

[0035] The cutting lines should preferably not run in a fold in the longitudinal direction of the liner.

[0036] The at least one cross-fiber layer can, but does not have to, be the outermost fiber layer. A cross-fiber layer can also, in addition to or alternatively, be one of the other fiber layers of a mat.

[0037] The transverse fiber layer preferably comprises at least 50% by weight, particularly preferably at least 60% by weight, of fibers arranged at an angle in a range of 45° to 135°, particularly preferably 80° to 100°, relative to the longitudinal direction of the liner.

[0038] According to the invention, the cross-fiber layer is also resin-impregnated. Further embodiments

[0039] In a further embodiment, the object underlying the invention is achieved by a cured liner, characterized in that the resin system of the resin-impregnated liner according to the invention is cured. For example, within the meaning of the invention, "cured" can be understood to mean that the residual styrene content is below 10 wt.% based on pure resin.

[0040] In a further embodiment, the object underlying the invention is achieved by a method for producing the liner according to the invention, wherein the method comprises at least the following steps: a. Providing at least one material web containing fibers for producing a fiber layer, b. Providing at least one further material web for producing a transverse fiber layer, which predominantly has fibers that are arranged at an angle in a range of 45° to 135° relative to the longitudinal direction of the material web, wherein these fibers arranged in this way are predominantly at least as long as the material web is wide, c. Making cuts in the further material web, wherein the fibers of the further material web are severed so that these fibers of the further material web arranged at the aforementioned angle predominantly have a median length in a range of 25 to 50% of the width of the material web, d.Joining the longitudinal edges of at least one of the material webs so that this material web becomes a tubular fiber layer, with the further material web becoming the transverse fiber layer, and the resulting tubular fiber layers lying within one another; e. Impregnating the fiber layers with a resin system.

[0041] In step a., a cross-fiber layer can also be formed.

[0042] The cuts in step c. are preferably made in the longitudinal direction of the liner. However, they can also be made in another direction.

[0043] In step d., the longitudinal edges of the remaining material web can be joined, for example, by needling or sewing. The longitudinal edges can be joined overlapping or butt-jointed. Joining the longitudinal edges can, for example, create the dry goods of the liner.

[0044] To obtain the finished liner according to the invention, additional layers, such as the outer layer or the inner layer, can also be added. The inner layer can preferably be provided with an anchoring layer (particularly preferably laminated).

[0045] Additional layers can also be added.

[0046] The steps do not have to be carried out in the chronological order in which they are mentioned.

[0047] In step c, the cuts can be made during the laying of a fiber layup or later, once the layup has already formed a material web. The cuts can be made using mechanical knives, scissors, or even laser or ultrasonic knives.

[0048] In a further embodiment, the object underlying the invention is achieved by using the liner according to the invention for rehabilitating pipelines or channels.

[0049] In a further embodiment, the object underlying the invention is achieved by a method for rehabilitating pipelines or sewers, characterized in that a liner according to the invention is introduced into a pipeline or sewer to be rehabilitated and the liner is cured in the pipeline or sewer. Curing can be achieved, for example, via UV light or thermally.

[0050] In a further embodiment, the object underlying the invention is achieved by a rehabilitated pipeline or channel, characterized in that the pipeline or channel has a liner according to the invention (cured or uncured). Figures

[0051] The figures are described below. This description focuses on specific and preferred embodiments of the invention, which are not limiting. Fig. 1 shows a liner 10 with the various layers in cross-section. Fig. 2 shows another material web 90 from which the transverse fiber layer 30 is formed.

[0052] Fig. 1 shows a liner 10 with an outer layer 110 and fiber layers 20, of which the outer fiber layer is a cross-fiber layer 30. The inner layer 120 can be a polymer film laminated on its inner side with an anchoring layer 130, such as a polyester nonwoven.

[0053] Fig. 2 shows the additional material web 90. A tubular transverse fiber layer 30 is created from the additional material web 90 by connecting the longitudinal edges 100. This is located, for example, at the very outer edge. The longitudinal edges can be connected by needling after they have been first overlapped. The fibers of the transverse fiber layer 40 are severed along cutting lines 60 using cuts 50.

[0054] The cutting length 70 is longer than the spacing length 80. The cuts 50 of the various cutting lines 60 are arranged offset so that the fibers of the transverse fiber layer 40 are always severed at least once. Example

[0055] The liners or lining tubes according to the invention can be obtained by methods known per se and described in the literature. Unless the method is described in more detail below, it can be assumed that the person skilled in the art will adhere to the methods known per se and described in the literature.

[0056] On a 300 cm wide scrim system, direct roving strands (continuous fibers, 0° fabric) made of glass fiber were inserted lengthwise at 1 cm intervals with a total basis weight of 600 g / m². Glass fibers were evenly layered on top of this at an angle of 90° with a basis weight of 600 g / m² (90° fabric). At this stage of production, this 90° fabric still has a length of 300 cm, i.e. the width of the scrim. Cut roving (CSM) with a basis weight of 600 g / m² was placed on top of this in a random orientation so that the individual fiber sections of the cut roving were positioned in all possible directions. To obtain the cut roving, the direct roving was cut into 10 cm long sections. The three fiber layers were then sewn together with polyester yarn to form a mat.

[0057] Another mat was made in the same way.

[0058] One of these resulting webs was then cut lengthwise by rotating knives. For this purpose, rotating knives were installed at 20 cm intervals. On the direct roving side, these knives penetrated the passing mat at regular intervals just far enough to make approximately 10 cm long cuts, each 5 cm apart, along a cutting line in the 90° fabric. The rotating knives were adjusted so that the adjacent rotating knives always made a cut in the 90° fabric whenever the adjacent rotating knife was outside the mat for the 5 cm distance. This ensured that each fiber of the 90° fabric was cut multiple times. This created the cross-fiber layer.

[0059] So there was now a mat with chopped 90° fabric and a mat with unchopped 90° fabric. A polymer tube was fed into a system for producing the dry goods. This polymer tube consisted primarily of polymer and had a diameter of 85 cm. However, it also had a standard styrene barrier (PE / PA / PE). The unchopped mat was placed around this tube so that it overlapped at the long edges, there was not too much play between the polymer tube and the mat, and so that the direct roving lay adjacent to the tube. The second mat with the chopped 90° fabric was then placed around this first mat so that the direct roving lay on the outside. The long edges were overlapped so that the mat could be placed around the first mat without too much play, and needled in the overlap area.The resulting dry material was impregnated with a UP resin containing a photoinitiator, a standard feature used in sewer rehabilitation liners. A tube similar to the inner polymer tube with a styrene barrier was then drawn around the impregnated liner. The final layer was a standard gray outer film that impermeates light and UV radiation and is mechanically stable.

[0060] With this sewer rehabilitation liner, a sewer with a diameter of 950 mm could be rehabilitated using conventional methods by pulling the liner into the sewer, setting it up and curing it with UV light. Reference symbol

[0061] 10 Liner 20 Fiber layers 30 Cross fiber layer 40 Fibers of the cross fiber layer 50 Severances or cuts 60 Cutting lines 70 Cutting length 80 Spacing length 90 Additional material web for producing the cross fiber layer 100 Longitudinal edges of the material web 110 Outer layer 120 Inner layer 130 Anchoring layer

Claims

1. A tubular liner (10) for the rehabilitation of pipelines or canals, the liner containing resin-impregnated fibrous layers (20), wherein at least one fibrous layer is a transverse fibrous layer (30) which mainly comprises fibres arranged at an angle in a range from 45 degrees to 135 degrees with respect to the longitudinal direction of the liner (10), characterized in that the fibres of the transverse fibrous layer (40) arranged in this way have a median length in a range from 20 to 50% of the circumference of the liner (10).

2. The liner (10) according to claim 1, characterised in that the transverse fibrous layer (30) mainly comprises fibres (40) arranged at an angle in a range from 80 degrees to 100 degrees with respect to the longitudinal direction of the liner (10).

3. The liner (10) according to any one of the preceding claims, characterised in that the at least one transverse fibrous layer (30) mainly comprises fibres (40) extending longitudinally essentially around the circumference of the liner (20), which, however, are severed at at least one point.

4. The liner (10) according to claim 3, characterised in that the severings (50) are grouped and the positions in the circumferential direction of the severings (50) of groups of severings (50) adjacent in the longitudinal direction of the liner (10) have distances of from 10 to 40% of the circumference of the liner (10).

5. The liner (10) according to any one of the preceding claims, characterised in that the fibres of the transverse fibrous layer (40) are severed by cuts in the longitudinal direction of the liner (10) having a length of from 0.5 to 50 cm, respectively.

6. The liner (10) according to any one of the preceding claims, characterised in that the severings (50) extend along one or several cutting lines (60) arranged in the longitudinal direction of the liner (10).

7. The liner (10) according to claim 6, characterised in that adjacent cuts (50) having a cutting length (70) are spaced from each other by one spacing (80) and the median of the spacing (80) of the cuts (50) along one cutting line (60) is shorter than the median of the cutting length (70) of the cuts (50) and the median of the spacing (80) is in a range from 20 to 70% of the median of the cutting length (70).

8. The liner (10) according to any one of the preceding claims, characterised in that the outermost fibrous layer (20) is a transverse fibrous layer (30).

9. A cured liner (10), characterised in that the resin system of a resin-impregnated liner (10) according to any one of claims 1 to 8 is cured.

10. A process for manufacturing a liner (10) according to any one of claims 1 to 8, wherein the process comprises at least the following steps: a. providing at least one material sheet containing fibres for manufacturing a fibrous layer (20), b. providing at least one additional material sheet for manufacturing a transverse fibrous layer which mainly comprises fibres arranged at an angle in a range from 45 degrees to 135 degrees with respect to the longitudinal direction of the material sheet wherein the fibres arranged in such a way are mainly as long as the material sheet is wide, c. making longitudinal cuts in the additional material sheet, wherein the fibres of the additional material sheet are severed such that said fibres of the additional material sheet arranged at the above-mentioned angle mainly have a median length in a range from 25 to 50% of the width of the material sheet, d. connecting the longitudinal edges of at least one of the material sheets such that this material sheet becomes a tubular fibrous layer, wherein the additional material sheet becomes the transverse fibrous layer and the formed tubular fibrous layers are arranged in one another, e. impregnating the fibrous layers with a resin system.

11. Use of the liner (10) according to any one of claims 1 to 9 for the rehabilitation of pipelines or canals.

12. A process for rehabilitating pipelines or canals, characterised in that a liner (10) according to any one of claims 1 to 8 is introduced into the pipeline or canal and the liner (10) is cured in the pipeline or canal.

13. A rehabilitated pipeline or rehabilitated canal, characterised in that the pipeline or canal comprises a cured liner (10) according to claim 9.