DE102022119919A1 - Contact-transparent UV and light protection system for pipe liners for trenchless sewer renovation with special mechanical stability - Google Patents

Abstract

The present invention relates to an insert hose for lining pipes or ducts, which has an inner film (IF) and an outer film (AF) which, when installed, faces an inner wall of the pipe or duct. The insert tube further comprises a reinforcing layer (VL) arranged between the inner film (IF) and the outer film (AF), which has a reinforcing material (GG) that is impregnated with a reaction material (RH) that can be cured under UV radiation. Furthermore, the insert tube has an intermediate film which is arranged between the outer film (AF) and the reinforcing layer (VL) without first being connected to the outer film (AF). The insert tube contains a color pigment that absorbs and/or reflects visible short-wave light, as well as a chemical compound (UV absorber) that absorbs and/or reflects invisible UV radiation. According to the invention, the color pigment is either in the outer film (AF) and the chemical compound in the intermediate film (ZF), or the color pigment is in the intermediate film (ZF) and the chemical compound in the outer film (AF). Together, the outer film (AF) and intermediate film (ZF) are designed so that they are at least contact-transparent. After the pipe liner has been installed, when there is a finished lining pipe in the renovated sewer, the films AF and ZF are firmly connected to each other and give the lining pipe very high mechanical strength.

Description

The present invention relates to an insert hose for lining pipes or ducts, which has an inner film (IF) and an outer film (AF) which, when installed, faces an inner wall of the pipe or duct. The insert tube further comprises a reinforcing layer (VL) arranged between the inner film (IF) and the outer film (AF), which has a reinforcing material (GG) that is impregnated with a reaction material (RH) that can be cured under UV radiation. Furthermore, the insert tube has an intermediate film (ZF) which is arranged between the outer film (AF) and the reinforcing layer (VL) without first being connected to the outer film (AF), i.e. before the liner has been cured. The insert tube contains a color pigment that absorbs and/or reflects visible short-wave light, as well as a chemical compound as a UV absorber that absorbs and/or reflects invisible UV radiation. According to the invention, the color pigment is either in the outer film (AF) and the chemical compound in the intermediate film (ZF), or the color pigment is in the intermediate film (ZF) and the chemical compound in the outer film (AF). Together, the outer film (AF) and intermediate film (ZF) are designed so that they are at least contact-transparent. After the pipe liner has been installed, that is after the reinforcing layer (VL) soaked with hardenable reaction material or resin has hardened, i.e. when there is a finished lining pipe in the renovated sewer, the films AF and ZF are firmly connected to one another and give the lining pipe very high mechanical properties Strength and stability.

Hose liners for sewer renovation have been known for a long time. For example, in the glass fiber pipe liner system with UV or steam curing, it is known that a thick-walled film made of PE (polyethylene) with a high density (HDPE - High Density Polyethylene), known as a sliding film, is inserted into the pipe to be renovated, which usually has the cross-sectional shape of a semicircle which is placed on the inner wall of the pipe. A flexible hose liner, also called an insert hose or just a liner, is then pulled into the pipe to be renovated, with the hose liner sliding over the sliding film (pulling process). On the one hand, this prevents damage to the hose liner by avoiding contact with the inner pipe wall or objects in the pipe, and on the other hand, the friction between the hose liner and the sliding film is very low and makes it easier to pull in the hose liner. This functionality is similar to that of a shoehorn.

In the glass fiber tube liner system with UV or steam curing, there is usually an inner and an outer tube, between which a carrier material, such as glass fibers in particular, is inserted, which is soaked with reactive plastic resin. For example, commercially available UP resins (polyester or unsaturated polyester resins), VE resins (vinyl ester resins) or EP resins (epoxy resins) are used as reactive plastic resins. For UP or VE resins, the resins are hardened, for example, with the help of photoinitiators. However, the hardening can also take place thermally. The tube liner is inflated in the pipe or expanded using a liquid until it rests on the inner wall of the pipe or the sliding film, in order to then harden the resin - for example using UV radiation from a UV radiation source slowly drawn through the pipe. Finally, the inner film of the tube liner can be peeled off and removed. The layer with the carrier material is then exposed to the substances to be conducted through the pipe.

From the WO 2012/159702 A1 a tube liner is known in which a protective tube made of a tear-resistant, non-stretchable and opaque material in the form of truck tarpaulin material, ie fabric-reinforced PVC, is arranged on the outside around the combination of tubular inner film, resin carrier layer and tubular outer film. This has such a width that the two longitudinal edges do not abut each other or overlap when wrapping the tubular outer film. To bridge the gap between the edges of the protective tube, as seen in cross section, a connecting film piece made of a stretchable material is provided that is connected to these edges of the protective tube. The early hardening of the resin is prevented by the fact that the outer film is impermeable to UV radiation.

From the DE 10 2014 114 627 A1 A pipe liner for trenchless sewer rehabilitation is known in which a mechanically protective, non-transparent outer film system is used, so that sliding films for pulling in the liner can be dispensed with. The outer film system is essentially impermeable to UV and visible light, which can be achieved, for example - as is often known from the prior art - by using an additional opaque UV and light protection film.

From the EP 2 379 625 A1 , an external contact-transparent UV and light protection film is also known. This describes the use of colorants and the use of UV absorbers.

There are also many protective films known from the prior art that, although they have a protective effect against UV radiation, are opaque.

For various reasons, however, it is advantageous if such protective films are transparent or at least contact-transparent. For example, in the case of food packaging, it is desirable that the packaging goods to be protected from the effects of UV radiation can be viewed by the buyer from the outside. In EP 1 138 479 B1 Such a protective film is described which protects against the effects of UV radiation up to a wavelength of <350 nm by containing titanium dioxide as a UV radiation-absorbing pigment. The titanium dioxide must be in a certain finely dispersed form to ensure sufficient transparency of the protective film.

In DE 1 002 177 A1 describes a thermoformable transparent film made of a thermoplastic in which the UV radiation is completely absorbed up to a wavelength of <380 nm with the help of organic or organometallic compounds.

In WO 00/27914 A transparent single-layer or multi-layer film is described which has a protective effect against UV radiation in a wavelength range of 280-390 nm and a combination of an inorganic and an organic compound that absorbs this UV radiation, such as a combination of zinc oxide or titanium dioxide and one Benzotriazole has.

Protective films that have a protective effect against UV radiation are used, among other things, in the renovation of sewers and sewer pipelines in the so-called hose lining process. According to this method, a flexible hose is first provided which is drawn into the pipe to be renovated. This tube comprises two tubular films with different diameters, between which a carrier material, preferably glass fiber material, is inserted, which is impregnated with a reactive plastic resin. After inserting the hose into the sewer pipe and inflating the hose in the sewer pipe, the plastic resin between the two hose films must be hardened in order to produce a stable pipe (lining pipe) on the inner wall of the sewer pipe to be renovated. Curing can be achieved by irradiation with UV radiation, with photoinitiators in the plastic resin triggering the polymerization or curing process when exposed to UV radiation. In order to prevent unwanted premature hardening of the plastic resin before it is introduced into the sewer pipe to be renovated, there must be at least one external UV and light protection system (this means the direction towards the wall of the sewer to be renovated), which acts as a hose encasing the pipe liner or embedding, represents a protective layer and must be designed in such a way as to prevent premature exposure to UV and light radiation and thus premature resin curing. The inner tubular film of such a renovation hose, on the other hand, must be permeable to UV radiation in order to enable the curing process when inflated. Hoses made of conventional multi-layer tubular films that are used in sewer renovation using the hose lining technique usually have sufficient absorption of UV radiation. However, since the photoinitiators contained in the reactive plastic resins can also be activated upon exposure to longer-wave radiation, such as short-wave visible light, it is necessary to prevent this risk of premature curing, especially during storage. This was attempted and achieved by using opaque tubular films.

However, this makes it impossible to control the uniform impregnation of the carrier material with the plastic resin to be hardened and thus prevent defects in the renovated sewer pipe caused by uneven impregnation.

The inventive transparency (at least (contact) transparency) through the tubular liner (to the outside or when looking from the outside into the interior of the tubular liner) is brought about in particular by the outer system or the outer film system, since the remaining components - in particular a resin carrier - System and an inner film (as long as it remains in the finished channel) - are generally much more transparent for visible light (here: from a wavelength of approx. 500 nm).

In particular, the inflows and outflows to and from the canal are very easy to recognize if light is shined in from the outside, ie from the side towards the main canal (or in the opposite direction). This irradiated light has a specific wavelength or covers a specific wavelength range, with a transmission of at least 5% of the outer film system being present according to the invention at least at a wavelength in the range from 500 nm to 800 nm, which is to be emitted by this light source. In particular, at a wavelength of 800 nm there is a transmission in the outer system of the liner of 5%, better 10% and in particular 20%. The light also penetrates the hardened pipe liner and is therefore optical Detection can be seen inside the channel, so that a milling robot can mill a hole for an inlet or outlet at exactly this point.

In addition, the carrier material can be impregnated with resin much better and more homogeneously - due to visual inspection (also) from the side of the reinforcing sheet - since it is immediately visible where resin is still missing on the carrier material.

This (contact) transparency of the external system is one of the most important reasons for a particularly well-functioning hose liner system or for a particularly well-functioning hose liner.

There is therefore a need for protective systems or protective films that have at least contact transparency, i.e. are not opaque, but still prevent the effects of both UV radiation and short-wave, visible light.

From the DE 10 2020 117 472 , the closest state of the art here, is an insert hose for lining pipes or ducts, which has an inner film and an outer film facing an inner wall of the pipe or duct when installed. The insert tube further comprises a reinforcing layer arranged between the inner film and the outer film, which has a reinforcing material that is impregnated with a reaction material that can be cured under UV radiation. Furthermore, the insert tube has an intermediate film which is arranged between the outer film and the reinforcing layer without being connected to the outer film. It turned out that exactly this aspect is very disadvantageous, as the stability of the lining pipe suffers. The insert tube contains a dye that absorbs and/or reflects visible short-wave light and a chemical compound that absorbs and/or reflects invisible UV radiation. According to the invention, the dye is either in the outer film and the chemical compound in the intermediate film, or the dye is in the intermediate film and the chemical compound in the outer film. The disadvantage of this invention is the lack of (contact) transparency. Another disadvantage is the fact that dyes can bleed out of a film (i.e. migrate out). This impairs the function of the hose liner and can lead to higher costs due to premature curing. In addition, it is in the DE 10 2020 117 472 revealed absorption or reflection of the “chemical compound” in a wavelength range from 200 nm to 400 nm to more than 90% and that in the DE 10 2020 117 472 The disclosed absorption or reflection of the dye in a wavelength range between 400 nm and 500 nm of more than 90% is still insufficient in this form, since up to 10% of the radiation that the resin is able to harden can penetrate through the film or films ( Up to 10% transmission leads to the resin hardening very quickly, ie within a few minutes).

Such a type of hose liners with the in the DE 10 2020 117 472 The structure described and the films described there could and will fail in use or in any case be disadvantageous in use. A significant improvement is desirable.

An object of the present invention was therefore to provide an (external) protective system or a protective film that is at least contact-transparent, but still permanently prevents the effects of UV radiation and short-wave, visible light.

This object is achieved by providing the inventive at least contact-transparent, UV radiation and short-wave, visible light-absorbing and/or reflecting external system of the tubular liner.
This requires at least two films: an outer film (AF) and an inner film, which can also be referred to as an intermediate film (ZF). Both films, AF and IF, can be single or multi-layered. One of the two films, AF or ZF, contains at least one color pigment that absorbs and/or reflects in the visible light range. If the film AF contains at least one color pigment, at least one UV absorber is introduced into the intermediate film ZF, which absorbs and/or reflects in the range of UV light, the UV and light protection system according to the invention being designed to be at least contact-transparent and at least contact-transparent remains.
However, if the film AF contains at least one UV absorber, at least one color pigment is introduced into the intermediate film ZF, which absorbs and / or reflects in the range of shorter-wave visible light, the UV and light protection system according to the invention consisting of outer film AF and inner intermediate film ZF is designed to be at least contact-transparent and remains at least contact-transparent.

Both the at least one color pigment and the at least one UV absorber are introduced into at least one layer of the respective film. According to the invention, the at least one color pigment is located either in the outer film (AF) and the at least one chemical compound (UV absorber) in the intermediate film (ZF), or the at least one color pigment is located in the intermediate film (ZF) and the at least a chemical compound (UV absorber) in the outer film (AF). Together, the outer film (AF) and intermediate film (ZF) are designed so that they are at least contact-transparent. The films AF and ZF form the outer system of the tube liner, which is responsible for UV and light protection.

It doesn't matter which polymer or polymers these films are made of. All polymers known to those skilled in the art (such as polyethylene PE, polypropylene PP, polystyrene PS, poly(meth)acrylates, polyesters such as PET, polyvinyl chloride PVC, polyamide PA, polycarbonate PC, polyether, thermoplastic polyurethanes TPU or even ionomers such as Surlyn) are included All possible and known combinations and configurations - for example in one or more foils - are possible. The at least one color pigment or the at least one UV absorber can be added both to the one (single) layer of a PE mono- and single-layer film, as well as to at least one layer of a 7-layer film such as polyethylene PE/adhesion promoter HV/Polyamide PA/Ethylene vinyl alcohol EVOH/PA/HV/PE.

It is definitely important that the at least one color pigment and the at least one UV absorber are in different (outer) films AF or ZF before the liner is hardened. However, this may no longer be the case after hardening. After the resin has hardened, i.e. after the tube liner has been installed to form a lining pipe, the films AF and ZF must, according to the invention, be firmly connected to one another for reasons of stability. It is also important that the at least one color pigment and the at least one UV absorber are present in a specific selected concentration in order, on the one hand, to still provide sufficient contact transparency and, on the other hand, to provide protection against UV light and visible light. In addition, both the at least one color pigment and the at least one UV absorber must remain in the respective film AF or ZF; under no circumstances should bleeding, flowering, blooming or other migration of these substances from the respective film occur. This would cause the external system of the hose liner to immediately lose its UV and light protection properties. Whether this outer system, in particular an outer film AF or ZF, but in particular the intermediate film ZF, is also connected to a nonwoven such as a fleece (in order to better fit the resin-impregnated carrier system and thus, for example, to remove and avoid air bubbles) or whether this film is integrated into the external system of the external system with other analogous films or systems (which contain the said substances at least one color pigment or at least one UV absorber) or completely different films or systems (which do not contain the said substances, color pigment or UV absorber). It is possible to insert a hose liner, but it is rather irrelevant here. The only important thing is that at least one layer of the respective film is provided with the at least one color pigment or with the at least one UV absorber, and it does not matter where this layer is applied and with which other films, nonwovens, mechanical protective films, etc . or a total of other components of the outer film system.

Both the at least one color pigment and the at least one UV absorber have a specific, advantageous size and geometry, which ranges between the (nano)powder form and the form as flakes. Color pigment and UV absorber must be added to one of the films AF or ZF in an appropriate concentration. This is ideally done in the form of a fattening batch.

For the purposes of this invention, the term “contact-transparent” means that the film according to the invention is at least so transparent that it is possible to control uniform impregnation of the carrier material with the plastic resin to be cured. This is based on testing the brightness of the impregnated carrier material. The determination of contact transparency is carried out using the method described in the examples below.

For the purposes of this invention, the term “UV radiation” or “UV light” is understood to mean electromagnetic radiation in a wavelength range of 200 to 400 nm.

For the purposes of this invention, the term “short-wave, visible light” or “short-wave, visible light” is understood to mean electromagnetic radiation in a wavelength range from 400 to 500 nm, preferably from 400 to 450 nm.

A color is a sensory impression conveyed by the eye and brain that is caused by light, more precisely by the perception of electromagnetic radiation with a wavelength between approximately 400 and 800 nanometers. It is the sensory impression through which two adjacent, structureless parts of the field of vision can be distinguished when observed with one eye and the unmoving eye alone.

In everyday language, colorants (coloring substances) are also referred to as paint, i.e. material means with which the color of objects can be changed, such as paints.

Color perception is a subjective sensation, which is determined not only by the type of incident light radiation, but also by the condition of the eyes, sensitivity of the receptors and the perceptual apparatus. Other optical perception phenomena, such as structure (light-shadow effects), shine or roughness, as well as psychological effects such as change of mood or adaptation, must be distinguished from the concept of color.
(Quoted from “https://de.wikipedia.org/wiki/Colour”).

Colorant is the generic term for all coloring substances. Inorganic and organic colorants are differentiated according to their chemical composition.

• nach der Löslichkeit: in Pigmente und Farbstoffe,
• nach der Herkunft: in natürliche und synthetische Farbmittel,
• nach der Farbe: in weiße, bunte, schwarze, Effekt- und Leuchtfarbmittel und
• nach chemischen Gesichtspunkten in z. B. Elemente, Oxide, Sulfide, Chromate, polyzyklische, ionische und nichtionische Farbmittel.

(Zitiert aus „https://de.wikipedia.org/wiki/Farbmittel“)A further distinction can be made in both groups

• according to solubility: into pigments and dyes,
• according to origin: into natural and synthetic colorants,
• according to the color: white, colorful, black, effect and fluorescent colorants and
• according to chemical aspects in e.g. B. Elements, oxides, sulfides, chromates, polycyclic, ionic and non-ionic colorants.

(Quoted from “https://de.wikipedia.org/wiki/farbenmittel”)

The at least one color pigment that is contained in the outer system according to the invention of the hose liner for trenchless sewer rehabilitation consisting of the outer outer film AF and inner outer film ZF is, on the one hand, an organic or inorganic color pigment selected from the group comprising carbonyl dyes, preferably quinone dyes, indigo dyes. Dyes and quinacridones, azo compounds, cyanine compounds, preferably triphenylmethane compounds, azomethines, iso-indolines, dioxazines, metal oxides, transition metal oxides, metal oxide hydrates and transition metal oxide hydrates. Of these color pigments, yellow or white color pigments are particularly preferably selected.

A dye comes - completely opposite DE 10 2020 117 472 - However, it is definitely not an option for the outer film system AF and ZF according to the invention, since dyes dissolve in the polymer by definition (see above) and therefore bloom or are removed from this layer through migration, whereby the light protection effect is then lost.

This list of (color) pigments provides an overview of pigments by base color, as is common in the specialist literature. A list of soluble dyes is available under List of dyes. However, this is not important in this invention, since only color pigments (not soluble in the polymer matrix) are used.

This list is based on the RAL structure and is divided into red, violet, blue, green, yellow, orange colored pigments and additionally brown pigments, as well as the achromatic pigments for white and black.

The lists can be found at: https://de.wikipedia.org/wiki/Liste der Pigmente and the further links mentioned there.

Preferably, an organic yellow or white color pigment is selected from the group comprising benzimidazole derivatives, benzotriazole derivatives, 1,4-quinone derivatives, 1,4-naphthoquinone derivatives, 9,10-anthraquinone derivatives, phenylazophenol derivatives, respectively in the form of the free compounds, in the form of tautomers or the salts of acids or bases or the solvates, preferably the hydrates. Preferably there is an inorganic yellow or white color pigment selected from the group comprising metal or transition metal oxides and transition metal oxide hydrates. A yellow or white color pigment selected from the group comprising 4-phenylazophenol, 2-(2'-methyl)phenylazo-4-methylphenol, N-(4-phenylazo)phenyldiethanolamine, benzotriazoles, benzimidazolone, iron oxide and iron oxide hydrate, is particularly preferred Benzimidazolone is preferred.

However, other colorants can be used as color pigments. According to the invention, at least one color pigment must be contained in one of the films AF or ZF. This means that mixed colors can be obtained by combining them with the color pigments, which in this case absorb or reflect in the visible light range. For example, if you add a red pigment to the same or a different layer of the external system, whereby the at least one color pigment is yellow, the appropriate dosage and concentration results in a more or less intense orange color for the observer.

For example, if you add a blue pigment to the same or a different layer (of the respective film) of the external system, whereby the at least one color pigment is yellow, then with the appropriate dosage and concentration the result is a more or less intense greenish, green-yellow, yellow-green or green color to the outside viewer. There are no limits to the color combination options with the (at least one) color pigments, as long as the external system tem maintains its protective effect against electromagnetic radiation to avoid resin hardening from the outside and overall contact transparency results.

Preferably, the organic or inorganic color pigment absorbs and/or reflects short-wave visible light in the wave range from 400 to 500 nm, particularly preferably in the wave range from 400 to 450 nm, preferably in each case to more than 95%, most preferably to more than 99%. If there is still a transmission that can be determined with a UV-Vis spectrophotometer, it is preferably below 5% in this wavelength range, and most preferably below 1%.

In a preferred embodiment, the external system consisting of the films AF and ZF contains an organic or inorganic compound selected from the group comprising metal oxides, transition metal oxides, metal oxide hydrates, transition metal oxide hydrates, phosphites, benzophenones, anthranilates, salicylates, dibenzoylmethane derivatives, p-aminobenzoic acid derivatives, Cinnamic acid derivatives (phenylacrylic acid derivatives), benzimidazole derivatives, benzotriazole derivatives, cyanoacrylates, benzotriazole derivatives, β-β'-divinyl acrylates, alkyl-α-cyano-β-β'-divinyl acrylates, 1,3,5-triazine -Compounds and sterically hindered amines, each in the form of the free compounds, in the form of tautomers or in each case the salts of acids or bases as UV radiation absorbing and/or reflecting compounds. Such compounds are sometimes marketed products, such as: B. Uvinule® from BASF AG.

The term “sterically hindered amines” refers to compounds in which one or more space-filling organic residues are bonded to at least one trivalent nitrogen atom. They are preferably aromatic or aliphatic, acyclic or cyclic secondary and tertiary amines such as N,N'-disubstituted p-phenylenediamines or substituted (amino)-piperidines.

Suitable color pigments and UV absorbers can be found in the DE 10 2009 041 841 .

The UV absorber preferably absorbs the UV radiation in a wavelength range from 200 to 400 nm, particularly preferably from 300 to 400 nm, preferably in each case to more than 95%, most preferably to more than 99%. If there is still a transmission that can be determined with a UV-Vis spectrophotometer, it is preferably below 5% in this wavelength range, and most preferably below 1%.

Preferably, the at least one color pigment also absorbs and/or reflects shorter-wave radiation of visible light in a wavelength range from 400 to 500 nm, particularly preferably from 400 to 450 nm, preferably in each case to more than 95%, most preferably to more than 99%. If there is still a transmission that can be determined with a UV-Vis spectrophotometer, it is preferably below 5% in this wavelength range, and most preferably below 1%.

The outer system of the tubular liner or the film according to the invention preferably contains 0.05 to 95% by weight, particularly preferably 0.1 to 50% by weight, very particularly preferably 0.5 to 20% by weight, in each case based on the total weight of the outer system of the tubular liner or the films, the at least one color pigment and in the same concentration range also the at least one UV absorber.

Preferably, each component of the at least one color pigment or the at least one UV absorber is stable at temperatures up to 300 ° C.

The outer system of the hose liner according to the invention, which contains, for example, at least two films, namely AF and ZF, or is produced with at least two films, namely AF and ZF, is therefore at least two-layered. The films AF and ZF of the outer system of the hose liner according to the invention are both preferably multi-layered. Before the liner has hardened, the AF and ZF films are not yet connected to each other. A connection of ZF and AF only occurs after curing and is successfully completed in the lining pipe according to the invention.

Principles of connection technology

I. Conclusion: force-fitting, form-fitting, material-locking

The words force-fitting, form-fitting and cohesive describe important operating principles in the field of connection technology. Sometimes different principles work at the same time. An example of the simultaneous occurrence of different types of effects is the screw connection: when the screw is tightened, it is form-fitting (thread) and non-positive (due to the force of being tightened).

a) form-fitting

Two components can be joined together in a form-fitting manner.

A spatial form is incorporated into both parts, with the forms complementing each other as positive and negative shapes.

A third part is only used if you want to prevent the connection from slipping apart in a certain direction.

For the most part, positive connections can be detached.

b) non-positive

Non-positive connections are created through the application of force. These include, for example: B. pressure forces or friction forces. The cohesion of the non-positive connection is guaranteed purely by the acting force. The adjective means force-fitting, the noun is force-fitting or force-fitting.

c) cohesive

Cohesive connections are all connections in which the connection partners are held together by atomic or molecular forces. At the same time, they are non-detachable connections that can only be separated by destroying the connecting means:

□ Soldering

Soldering is a thermal process for joining materials together. Soldering is a very old technique that has been proven to have been used as early as 5000 BC. was known. The metals known at the time, gold, silver and copper, were processed into cult or jewelry items.

□ Welding

Welding is the inseparable joining of components using heat and/or pressure, with or without the use of welding filler materials. The history of welding begins with the Sumerians and Hittites in the 3rd millennium BC. The development made little progress over thousands of years, only to accelerate rapidly with the inventions of the 19th century.

□ Gluing

Gluing is also a material bonding process. The adhesive sticks to the surface of a part to be joined. The individual parts are connected through physical (rarely chemical) interactions.

The outer system of the hose liner according to the invention, which contains at least two films, namely AF and ZF, or is made at least from two films, has at least one barrier layer, particularly preferably an oxygen barrier layer, a water vapor barrier layer or an oil barrier layer.

At least one polyamide (PA), ethylene-vinyl alcohol copolymer (EVOH), polyvinyl alcohol (PVOH), cyclic olefin copolymer (COC), polyvinylidene chloride (PVdC) or a mixture of at least two of the polymers mentioned are preferably suitable for producing the barrier layer. particularly preferably at least one polyamide.

The polyamides (PA) used to produce the barrier layer are preferably thermoplastic aliphatic, partially aromatic or aromatic polyamides. Accordingly, the diamines used to produce these polyamides can be either aliphatic diamines with 2-10 carbon atoms such as hexamethylenediamine or aromatic diamines with 6-10 carbon atoms such as B. p-phenylenediamine and the dicarboxylic acids used to produce these polyamides can be aliphatic or aromatic dicarboxylic acids with 6-14 carbon atoms such as adipic acid, terephthalic acid or isoterephthalic acid. Furthermore, the polyamides can be produced from lactams with 4-10 carbon atoms such as ε-caprolactam. Polyamides used according to the invention are, for example, PA 6, PA 12, PA 66, PA 6I, PA 6T and/or mixtures of at least two of the polymers mentioned.

The polyvinyl alcohols used to produce the barrier layer are obtained by complete or incomplete hydrolysis of corresponding polyvinyl acetates (PVA) and therefore include both partially saponified polyvinyl acetates, which have a degree of saponification of 50 to 98 mol%, and fully saponified polyvinyl acetates with a degree of saponification ≥ 98%.
The ethylene-vinyl alcohol copolymers (EVOH) used to produce the barrier layer are obtained by complete or incomplete hydrolysis of corresponding ethylene-containing polyvinyl acetates (EVAc) and primarily include fully saponified ethylene-containing polyvinyl acetates with a degree of saponification ≥ 98%.

The cyclic olefin copolymers (COC) used to produce the barrier layer can also be copolymers of α,β-unsaturated cyclic olefins with 4-10 carbon atoms such as norbornene and thermoplastic α,β-unsaturated olefins such as ethylene or propylene.

Preferably, at least one surface layer of the outer system of the tube liner according to the invention, which contains at least two films AF and ZF or is made from at least two films, is based on at least one thermoplastic olefin homo- or copolymer.

Olefin homo- or copolymers in the context of this invention are thermoplastic polymers of α,β-unsaturated olefins with 2-6 carbon atoms such as polyethylene (PE, especially LDPE or HDPE), polypropylene (PP), polybutylene (PB), polyisobutylene (PI ) or mixtures of at least two of the polymers mentioned. “LDPE” refers to low-density polyethylene, which has a density in the range of 0.86-0.93 g/cm ³ and is characterized by a high degree of branching of the molecules. “HDPE” refers to high-density polyethylene, which has only a slight branching of the molecular chain, whereby the density can be in the range between 0.94 and 0.97 g/cm ³ .

If necessary, the olefin homo- or copolymers mentioned can be modified with at least one organic acid or at least one organic acid anhydride, preferably with a cyclic organic acid anhydride, particularly preferably with maleic anhydride, and thus serve as a material for an adhesion promoter layer in a multilayer film according to the invention.

In a preferred embodiment, an adhesion promoter layer, preferably containing at least one modified polyolefin, can be arranged between a surface layer and the barrier layer.

A modified polyolefin is a thermoplastic polymer made from an α,β-unsaturated olefin with 2-6 carbon atoms such as polyethylene (PE, especially LDPE or HDPE), polypropylene (PP), polybutylene (PB), polyisobutylene (PI) or a mixture of to mean at least two of the polymers mentioned, which are modified with at least one organic acid or at least one organic acid anhydride. A modified polyolefin is preferably a polyethylene or polypropylene modified with a cyclic organic acid anhydride, particularly preferably a polyethylene or polypropylene modified with maleic anhydride.

The adhesion promoter layer preferably consists of a modified polyolefin, which is particularly preferably grafted with maleic anhydride.

In a preferred embodiment, each of the surface layers of the outer system of the tube liner according to the invention, which contains at least two films AF and ZF or is made from at least two films, is based on at least one olefin homo or copolymer and is each connected to the barrier layer via an adhesion promoter layer.

In a preferred embodiment, at least one of the inner layers of the outer system of the hose liner according to the invention, which contains at least two films, namely AF and ZF, or is made at least from two films, contains at least one UV absorber which absorbs and/or reflects the harmful radiation. The same applies preferably to the at least one color pigment.

Preferably, the at least one UV absorber, whereby the UV and light protection system according to the invention is designed to be at least contact-transparent and remains at least contact-transparent, is present in at least one surface layer.

Preferably, the at least one color pigment, whereby the UV and light protection system according to the invention is designed to be at least contact-transparent and remains at least contact-transparent, is present in at least one surface layer.

Since color pigments have a very high hiding power, setting the contact transparency in the external system is a particular challenge that was successfully mastered within the scope of this invention.

Preferably, the outer system of the hose liner according to the invention has a thickness of 20 to 20,000 µm, particularly preferably 50 to 5,000 µm, very particularly preferably 100 to 1,000 µm, in particular 150 to 500 µm.

The outer system of the hose liner according to the invention can be manufactured using any manufacturing process such as lamination, extrusion or preferably (co-)extrusion. The AF and ZF films used in particular are manufactured in this way.

The external system according to the invention with the at least one color pigment and the at least one UV absorber, wherein the UV and light protection system according to the invention is designed to be at least contact-transparent and remains at least contact-transparent, can be further protected mechanically, for example by a sliding film or a fabric-reinforced film or a truck tarpaulin, to name a few examples. Such protection systems are known to those skilled in the art. You just have to make sure that the contact transparency of this external system still remains.

Both individual and all layers or films of the outer system of the tubular liner according to the invention can be formed by extrusion, in particular by blown film extrusion and/or flat film extrusion, in particular blown film co-extrusion and/or flat film co-extrusion.

These manufacturing processes and corresponding production parameters are generally known to those skilled in the art.

The films of the outer system of the tube liner according to the invention can preferably be produced by co-extrusion, with a blown film co-extrusion process being particularly preferred.

Furthermore, the outer system of the hose liner according to the invention can preferably be printed.

The outer system of the tubular liner according to the invention consisting of the films AF (outer outer film) and ZF (inner outer film or intermediate film) is suitable for producing protective films or protective systems against the effects of UV radiation and short-wave visible light.

The subject of the present invention is the use of the outer system of the tube liner according to the invention as a tubular protective film, in particular as an outer, tubular protective film of a tube having two tubular systems or films in order to avoid curing between the two tubular films triggered by UV radiation and / or short-wave light packaged carrier material soaked in reactive plastic resin.

The use of the outer system of the tube liner according to the invention as an external tubular protective film of the double-walled tube used in tube lining has the great advantage that, in addition to the effect of UV radiation, it also prevents the effect of short-wave, visible light. As a result, the photoinitiators contained in the plastic resins to be cured cannot be activated even when exposed to longer-wave radiation, which prevents unwanted premature curing and allows the tube to be stored for a long time, preferably at least one year. Since the outer system of the hose liner according to the invention is also contact-transparent, it is easy to check that the carrier material is evenly impregnated with the plastic resin to be hardened, which prevents the occurrence of defects in the renovated sewer pipe.

If the outer system of the hose liner according to the invention also has a barrier layer, its use as a protective system when renovating sewers using hose lining technology also prevents a barrier effect against possible drying out of the resin and the entry of substances such as monomers into the sewer system and into the groundwater.

The hose used as an external system during sewer renovation using the hose lining technique should advantageously not only have an external system according to the invention in order to protect the carrier material used for sewer renovation, which is soaked with a plastic resin mass to be hardened, but also a plastic film as an internal tubular film , which has the properties necessary for sewer renovation.

For this purpose, this (inner) film must not only have sufficiently storage-stable mechanical properties so that it can withstand the stresses when handling the sewer renovation hose, especially when inflating it in the sewer system, the previous transport and the previous storage, but also after the plastic material has hardened in the carrier material The renovation pipe can be removed without tearing it off or tearing it apart.

In addition, it must be ensured that until the liner (hose) used for sewer renovation is used, the inner hose film also provides a sufficient barrier against the resin drying out, i.e. H. against the loss of monomers or remaining impregnation material.

The tube or the tube liner preferably has an external system as protection against UV radiation and shorter-wave visible light and an internal tube film as well as the carrier material in between, which is impregnated with the plastic resin to be hardened. After curing, the renovated sewer pipe (lining pipe) is formed from this soaked carrier material. The preferred carrier material is glass fabric made of glass fibers, preferably with unsaturated polyester resins and α,β-unsaturated monomers, such as. B. is soaked in styrene. Nonwovens such as fleeces or felts can also be used as carrier materials.
The external system according to the invention can also be on one side with the above-mentioned carrier material lien be connected and/or brought into contact with other carrier materials. In particular, this design is carried out with the ZF film.

After curing, the internal, inflated tubular film is preferably removed again from the renovated sewer pipe made of plastic/glass fiber fabric.

In a further preferred embodiment, after curing, the internal, inflated tubular film can remain in the renovated sewer pipe or lining pipe made of plastic/glass fiber fabric. For this purpose, it has proven to be very beneficial if there is a resin-absorbent material on the outside of this inner film, such as a nonwoven such as felt or a fleece, which is connected to this film. This allows the inner film to bond directly to the resin-impregnated carrier material or the reinforcing layer.

If the films AF (outer outer film) and ZF (inner outer film or intermediate film) are not yet connected to each other before the resin has hardened and therefore before the pipe liner is installed, whereby the connection techniques listed above are meant by “connection”, then the films are AF and ZF are connected to one another after the resin has hardened and thus after the pipe liner has been installed in the now renovated sewer. This connection is at least non-positive and occurs due to the immensely high pressure that the hardened carrier material or the hardened reinforcement layer exerts in the direction of the channel wall, where the foils AF and ZF of the external system are located. This connection of the films AF and ZF can also be materially bonded. Due to the exothermic reaction due to the hardening of the resin, the temperatures increase locally at least very sharply (above 100 ° C), which means that the opposing outer layers of the films ZF and AF can connect through melting and the pressure of the carrier system or the reinforcing layer. The corresponding layers can be welded here. In order to achieve this, the person skilled in the art knows well-sealing polymers that can be introduced into one or more outer layers of the film AF or the film ZF so that these films bond together even better and more firmly. Examples of such particularly sealable or weldable polymers are polyethylene PE, ionomers such as Surlyn, compounds polymerized with metallocenes as a catalyst (for example mLLDPE) or ethylene vinyl acetate (EVAc) or special other co- or terpolymers.

In any case, after the hose liner has hardened in the resulting lining pipe of the renovated sewer, the foil ZF and AF can no longer be separated without destroying the lining pipe. This is the most important difference from the DE 10 2020 117 472 , where this is not the case. This means that the stability of the outer film system in the lining pipe here is immensely high. According to the criteria of the German Institute for Construction Technology (DIBT), this must also be the case after the liner has been installed in order to avoid that the lining pipe collapses and, for example, a trench is formed in the ground. If a lining pipe that has been renovated in this way runs under a road or under a structure, considerable safety risks can arise if the lining pipe is unstable.

In order to meet the requirements of problem-free handling of the inner tube film during sewer pipe renovation using the tube lining technique, a 3-layer plastic film is used, for example, which comprises a barrier layer, preferably an oxygen barrier layer, water vapor barrier layer and/or oil barrier layer, and is attached to the impregnated carrier material immediately adjacent surface layer in the liquid impregnation material to be cured, d. H. in the plastic resin mass to be cured, is practically not swellable.

Preferably, the barrier layer is based on at least one of the polymers specified above for the production of the barrier layer of the external, tubular protective film of the sewer rehabilitation system according to the invention, particularly preferably on at least one polyamide, ethylene / vinyl alcohol copolymer, polyvinyl alcohol, a cyclic olefin copolymer, polyvinylidene chloride, in its entirety particularly preferably on at least one polyamide.

The barrier layer of the inner tubular multilayer film of the tube preferably has a further plastic layer on each of its surfaces, of which the surface layer immediately adjacent to the carrier material to be hardened must not be able to swell in the impregnation liquid.

According to the invention, the term “non-swellable” means that according to the gravimetric method described below for determining swelling, a flat sample may have a maximum weight increase of 3% by weight.

Olefin homo or copolymers are preferably suitable for producing these surface layers. Olefin homo or copolymers are also particularly suitable in connection with the structure of the external tubular film Sewer rehabilitation system according to the invention has been specified. In particular, they are thermoplastic polymers of α,β unsaturated olefins with 2 to 6 carbon atoms, such as polyethylene, polypropylene, polybutylene, polyisobutylene or mixtures of at least two of the polymers mentioned. A mixture of polyethylenes, preferably low density polyethylene and linear low density polyethylene, is preferably used to produce the second surface layer. If necessary, the barrier layer is connected to the surface layers mentioned via an adhesion promoter layer.

The above-mentioned polymer materials for adhesion promoter layers can also be used to produce the adhesion promoter layers between the barrier layer and the respective surface layer.

The internal tubular film of the sewer renovation system according to the invention preferably has a total thickness of 20 - 2,000 µm, preferably 120 - 300 µm, very particularly preferably 150 - 250 µm and is characterized by excellent mechanical values.

By using the inner tube film described above, the double-walled tube drawn into the sewer to be renovated, i.e. the tube liner, can be easily removed, i.e. H. be inflated without bursting in order to achieve problem-free UV curing of the carrier material (or reinforcing layer or reinforcing material, such as glass fabric) contained in the tube and soaked with the liquid impregnation material. In addition, after hardening, when the solidified, renovated sewer pipe is made of the hardened carrier material, the inner tube film can be removed from it without tearing or getting stuck if it is not intended to remain in the lining pipe.

Use of masterbatches:

The at least one color pigment and the at least one UV absorber, i.e. the special substances contained in the films AF and ZF, whereby the UV and light protection system according to the invention is designed to be at least contact-transparent and remains at least contact-transparent, are incorporated into the films AF and ZF of the outer system of the liner are preferably added in the form of masterbatches.

The term masterbatch refers to plastic additives in the form of granules with colorant and/or additive contents that are higher than in the end application. They are added to the natural plastic (raw polymer) to color or change the properties. Compared to pastes, powders or liquid additives, masterbatches increase process reliability and are very easy to process.

In general, there are three groups of masterbatches. On the one hand, the color masterbatches, which are used to color plastic products, and on the other hand, additive masterbatches, which ensure certain properties of the end products, such as UV stabilization, UV absorption, flame retardancy, antistatic or antiblocking, as well as combination masterbatches, which contain both dyes and additives contain.

• Man kann Limonade herstellen, in dem man Fruchtsaft, Zucker und Aromastoffe in Wasser einrührt. Bequemer ist es allerdings einen Sirup zu verwenden, in dem die Farb- und Geschmack gebenden Zusatzstoffe bereits in konzentrierter Form mit wenig Wasser vorgemischt wurden. Ebenso kann man die Farben und andere Eigenschaften von Kunststoffen verändern, in dem man dem Rohpolymer Farbpigmente und Chemikalien zusetzt. Einfacher ist es natürlich ein Konzentrat sprich einen Masterbatch zu verarbeiten der bereits alle notwendigen Zusatzstoffe enthält.

An explanation of how the term “masterbatch” may have come about may be based on a generalization of the rubber manufacturing process. In the past, only the master was allowed to produce highly concentrated and therefore expensive mixtures (batches) for later dilution. They were the master's mixtures (= masterbatches). Color/additive/combination concentrates are the equivalents in German industry slang. A more scientific description would probably be “polymer-bound additives”. As a layperson, you can imagine masterbatches like beverage concentrates:

• You can make lemonade by stirring fruit juice, sugar and flavorings into water. However, it is more convenient to use a syrup in which the coloring and flavoring additives have already been pre-mixed in concentrated form with a little water. You can also change the colors and other properties of plastics by adding color pigments and chemicals to the raw polymer. It is of course easier to process a concentrate, i.e. a masterbatch, which already contains all the necessary additives.

Manufacturing

In the mixing room, color pigments and/or chemicals are mixed with raw polymer (i.e. untreated plastic granules). This mixture is then melted in an extruder and, in the case of a strand granulator, pressed through small holes to form endless spaghetti. The hot plastic cords immediately run through a water bath, where they are cooled down to room temperature and harden completely. At the end of the water bath there is a granulator that cuts the endless strands into pieces a few millimeters long. This production method is suitable for quantities of up to a few tons.

Higher tonnages are produced using underwater granulators. However, not all recipes are suitable due to their rheological properties support this method. The mixture is melted again in an extruder and pressed through a sieve plate, in front of which a cutting knife rotates in a narrow gap. By rinsing with water, the escaping plastic, which has been cut into lens-shaped granules, will immediately solidify under water. The granules are constantly transported away by the water flow and dried in a centrifuge.

Regardless of the production method, the masterbatch is then sent through a classifying sieve and possibly through a metal separator in order to remove plastic parts that are too large or too small or small metal parts that have come loose from the machine due to wear. Depending on the polymer carrier, the finished product is packed in plastic bags or moisture-proof, aluminum-lined containers and then delivered to plastics processing companies. (quoted from: https://www.chemie.de/lexikon/Masterbatch.html).

Color masterbatches

When it comes to colorants, a distinction is made between dyes and pigments, with the latter being far more important for the plastics sector. Pigment particles (primary particles), as they are usually produced during production, have pronounced attractive forces due to their extremely small particle sizes. So-called aggregates are created from the primary particles when they are placed together over a large area.

In powder pigments, the aggregates are always clumped together to form agglomerates, which must be broken up during coloring, wetted by the plastic and distributed homogeneously. These simultaneous processes are referred to as dispersion. The dispersion process is mechanically difficult and complex. Dyes involve a dissolving process. The result is molecularly dissolved dye. The solubility depends on the respective dye, the plastic and the processing conditions.

Color masterbatches contain colorants in dispersed or dissolved form. The color or shade serves, among other things, as an identification feature for a company or for a specific product, as a protective component, as a security feature or as a functional additive. Amorphous plastics (polystyrene, polycarbonate, polymethyl methacrylate, etc.), whose transparency should be maintained, require the use of polymer-soluble dyes.

Mono concentrates or single pigment concentrates (SPC) consist of just one colorant in a carrier material. PE, PP, PS and many more are used as carrier materials. into consideration. Depending on the colorant, the concentration in the carrier material varies (inorganic pigments up to 70%, organic pigments up to 60%, dyes up to 25%). They are sent directly to the plastics processors, e.g. B. Compounders, extruders, injection molders or sold to other masterbatch manufacturers. Internally, they are used to formulate tailor-made masterbatches according to customer requirements, as an alternative to powder pigments.

Tailormade (color) masterbatches are corresponding to one

Customer requirement profile tailored (color, matrix, function) masterbatches. In order to meet certain requirements, combinations of pigments, dyes, effect pigments and other materials are required. Powdered colorants or SPCs are used.

Effect pigment masterbatches:

Effect pigments require gentle treatment in order not to destroy the leaflet structure. Processing in combination with standard pigments often does not guarantee this. High shear forces in extruders should be avoided.

The masterbatches contain effect pigments such as: B. pearlescent pigments, metal pigments, color-variable pigments, fluorescent pigments/dyes, glitter, spangles, glass or fibers.

Combined (master) batches:

The combination of colorants and functional additives is desired by some processors. The advantage is obvious. The customer can work with a product. There is no need to avoid errors or store multiple products.

Combinations of colorants, UV stabilizers, UV absorbers and antioxidants are common because the necessary concentrations are possible in the masterbatch. Further variations include mixtures of colorants and flame retardants, with nucleating agents, with lubricants, with antistatics, antirepellants, laser pigments and much more.

Compounds are granular or powdered preparations that contain all the ingredients of the final article and are processed directly into the final article.

These are ready-to-use preparations for the end product manufacturers.

Difficult requirement profiles such as B. conductive compounds require compounds.

Universal batches can be used universally for all polymers. A dream for all users. But only a few colorants can be used universally in polymers. Detailed investigations show problematic influences (rheological, mechanical).

Color differences generally occur due to the inherent color of the carrier systems.
(quoted from: https://www.vdmi.de/de/produkte/masterbatches/produkte-undprocessing/produkte/farbmasterbatches/)

Determination methods:

Determination of contact transparency:

• Note 1: sehr gut lesbar (Text klar erkennbar, es fällt nicht auf, dass eine Folie über dem Text liegt),
• Note 2: sehr leichte Beeinträchtigung der Lesbarkeit des Textes unter der Folie, Note 3: leichte Beeinträchtigung der Lesbarkeit des Textes unter der Folie,
• Note 4: Merkliche Beeinträchtigung der Lesbarkeit des Textes unter der Folie. Der Text kann aber insgesamt noch gelesen werden.
• Note 5: Deutliche Beeinträchtigung der Lesbarkeit des Textes unter der Folie. Die Buchstaben erscheinen sehr verschwommen und sind verdeckt und sind fast nicht mehr zu erkennen. Der Text kann praktisch nicht mehr gelesen werden.
• Note 6: Der Text unter der Folie kann nicht mehr erkannt werden und ist unlesbar. Die Folie deckt den Text (nahezu) vollständig ab. Es liegt keine Kontakttransparenz mehr vor.

To determine the contact transparency, the respective external system according to the invention is placed on a white DINA4 page printed with black text (font: Arial, font size 10) and the readability of the underlying text is assessed using a school grading system:

• Grade 1: very easy to read (text clearly visible, it is not noticeable that there is a slide over the text),
• Grade 2: very slight impairment of the readability of the text under the foil, Grade 3: slight impairment of the readability of the text under the foil,
• Grade 4: Noticeable impairment of the readability of the text under the slide. However, the text as a whole can still be read.
• Grade 5: Significant impairment of the readability of the text under the slide. The letters appear very blurry and are obscured and are almost impossible to see. The text can practically no longer be read.
• Note 6: The text under the slide can no longer be recognized and is unreadable. The slide covers the text (almost) completely. There is no longer any contact transparency.

Determination of UV/light blocking effect:

UV-VIS device used (UV-Vis spectrophotometer): Specord 200 Plus from Analytik Jena.

To determine the protective effect of the outer film system according to the invention against UV radiation or short-wave visible light, a small bag (dimensions 10 cm x 10 cm) is formed from this system, for example from a film, by appropriate sealing. Place approximately 50 g of a reactive resin mixture in this bag - in a darkened room - within 1 minute, which can harden using UV or short-wave visible light. The bag is then completely and tightly closed and exposed to sunlight (the tests took place on sunny days with more than 8 hours of solar radiation per day in July).

The time until the packaged resin has solidified through radiation-induced curing by sunlight is determined. With maximum protection against UV radiation or short-wave visible light, the resin can be exposed to sunlight indefinitely without hardening.

Determination of swelling:

The swelling of a film in water is determined gravimetrically. For this purpose, the external system according to the invention is dried in a drying cabinet at 50 ° C for 24 hours. After the external system according to the invention has cooled, a sample sample with a diameter of 6 cm is cut out and weighed. This sample is placed in a Petri dish with a diameter of 5.5 cm, which is filled to the brim with water, on the surface of the water without air bubbles, whereby the surface of the film that comes into contact with water corresponds to the surface that is to be hardened in the sewer rehabilitation system according to the invention Carrier resin comes into contact. The assembly is covered with a glass jar and weighted with a weight of 2.6 kg to prevent evaporation. In order to determine the swelling after 1 hour, 2, 5, 4 or 24 hours of storage in water, after the respective period of time, the film sample that was stored at room temperature is removed from the Petri dish, patted dry with absorbent cloths and weighed. The difference in the weight of the dried film sample used and the respective weight of the film sample after the time specified above is given as a measure of the swelling. To determine the swelling, a double measurement is always carried out and the average value is calculated.

The special feature of this invention is that the films AF and ZF in the lining pipe (of the renovated sewer) are firmly connected to one another, can no longer be separated without being destroyed and this lining pipe is characterized by increased stability. That is the most important difference from that DE 10 2020 117 472 .

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2012159702 A1 [0004]
• DE 102014114627 A1 [0005]
• EP 2379625 A1 [0006]
• EP 1138479 B1 [0008]
• DE 1002177 A1 [0009]
• WO 0027914 [0010]
• DE 102020117472 [0018, 0019, 0035, 0095, 0130]
• DE 102009041841 [0045]

Claims (16)

Insertion hose, in particular hose liner for lining pipes or ducts, with an inner film (IF), an outer film (AF) facing the inner wall of the pipe or duct, in particular an outer film (AF), one arranged between the inner film (IF) and the outer film (AF). Reinforcing layer (VL), which has a reinforcing material (GG glass fabric) that is impregnated with a reaction material (RH, reaction resin) that can be cured under UV radiation, an inner outer film or intermediate film (ZF), which is between the in particular outer outer film (AF) and the reinforcing layer (VL) is arranged without being connected to the outer film (AF) - before curing and before installation of the liner, in particular the intermediate film (ZF) and the outer film (AF) being movable relative to one another and/or from one another are soluble, at least one color pigment that absorbs and/or reflects visible short-wave light, and with at least one chemical compound, in particular at least one UV absorber, which absorbs and/or reflects invisible UV radiation, characterized in that either the at least one color pigment in the outer film (AF) and the at least one UV absorber in the intermediate film (ZF) or the at least one color pigment in the intermediate film (ZF) and the at least one UV absorber in the outer film (AF), wherein the outer film (AF) and the intermediate film (ZF) together form an outer (film) system (films AF and ZF). Insert hose Claim 1 , characterized in that its outer (film) system (films AF and ZF) is at least contact-transparent. Insertion tube according to one of the preceding claims, characterized in that for sufficient contact transparency of the outer (film) system (films AF and ZF) there is a transmission of at least 5% at the wavelength of 800 nm. Insertion tube according to one of the preceding claims, characterized in that the intermediate film (ZF) and/or the outer film (AF) comprises several layers (PE, PA), and that the at least one UV absorber is located in an adhesion promoter (HV), which connects the several layers (PE, PA) with each other. Insertion tube according to one of the preceding claims, characterized in that the at least one UV absorber absorbs and/or reflects more than 95% of the UV radiation in a wavelength range of 300 nm to 400 nm. Insertion tube according to one of the preceding claims, characterized in that the color pigment absorbs or reflects more than 95% of visible short-wave light in a wavelength range between 400 nm and 500 nm. Insertion tube according to one of the preceding claims, characterized in that its outer (film) system has a transmission to electromagnetic radiation, in particular UV light and visible light, in the wavelength range from 300 to 500 nm of less than 5%. Insertion hose according to one of the preceding claims, characterized in that a fleece layer (V) is laminated onto the intermediate film (ZF). Insertion tube according to one of the preceding claims, characterized in that one or both outer layers of the intermediate film (ZF) and one or both outer layers of the outer film AF contain particularly sealable polymers such as PE, ionomer, ethylene vinyl acetate, in particular that side of the intermediate film (ZF) which is the Outer film AF faces or that side of the outer film (AF) that faces the intermediate film (ZF), so that the outer film (AF) and the intermediate film (ZF) connect particularly well to one another after resin hardening. Insert hose Claim 8 , characterized in that the fleece layer (V) comprises a polyester fleece, a PE fleece or a glass fleece. Insertion hose according to one of the preceding claims, characterized in that the reinforcing material contains glass fibers (GG). Insertion hose according to one of the preceding claims, characterized in that before insertion, a sliding film or a protective film or a preliner is introduced into the channel to be renovated as an insertion aid so that the insertion tube is not damaged during insertion. Insertion tube according to one of the preceding claims, characterized in that the at least one color pigment and the at least one UV absorber in the outer (film) system (films AF and ZF) are 0.05 to 95%, preferably 0.1 to 50% by weight .%, particularly preferably 0.2 to 20% by weight, are present. Insertion hose according to one of the preceding claims, characterized in that the thickness of the outer (film) system is 20 to 20,000 micrometers. Insertion hose according to one of the preceding claims, characterized in that it has at least one barrier layer, preferably an oxygen barrier layer, water vapor barrier layer or oil barrier layer, both in the inner film (IF) and in the outer (film) system (films AF and ZF). Lining pipe, which was obtained from its insertion hose according to one of the preceding claims by expanding the initially folded insertion hose in the sewer to be renovated and the reaction material or resin (RH) was cured under the influence of UV radiation, in particular from the inside, after which Hardening of the reaction material or resin (RH) and in particular after the installation of the hose liner in the lining pipe, the outer film (AF) is firmly connected to the intermediate film (ZF), in particular not in a non-destructively separable manner.