Adhesive tape

Abstract

The invention relates to an adhesive tape, in particular a wrapping tape for wrapping cables in automobiles, having a textile carrier, and having an adhesive coating on at least one side of the carrier, wherein the textile carrier has been produced at least partly from a plastic recyclate, and wherein the proportion of recycled fibers in the textile carrier is at least 50% by weight, based on the weight per unit area of the carrier, characterized in that the plastic recyclate has been produced from textile waste.

Description

and re je ws ki • h on ke Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) tape Description: The invention relates to an adhesive tape, in particular a wrapping tape for wrapping cables in automobiles, with a textile carrier and with an adhesive coating on at least one side of the carrier, wherein the textile carrier is at least partially made from a recycled plastic, and wherein the proportion of recycled fibers in the textile carrier is at least 50 wt.%, based on the basis weight of the textile carrier. Recycled plastics are increasingly being used to conserve resources on the one hand and to reduce the consumption of petroleum, from which plastics are normally produced for fiber production. In the generic prior art according to EP 4092092 A1, the fibers of the textile backing material are obtained from recycled polyethylene terephthalate (PET) for this purpose. The recycled PET itself is mainly derived from recycled PET bottles and, where applicable, from recycled secondary products of the polyester industry, as described in the relevant paragraph.

[0069] The process is explained. The PET bottles in question are mechanically washed and then shredded. This creates so-called "flakes," which are then melted down and processed into fibers. Independently of this, utility model DE 202019 100588 U1, filed by the applicant, presents an alternative method for the resource-efficient production of such adhesive tapes, in which the textile backing is produced at least partially using bio-based polymers. The bio-based polymers can, in turn, be based on so-called a nd re je ws ki • h on ke Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 2 “Bioplastics” are produced, i.e., those that rely on raw materials consisting primarily of starch and cellulose from sugar biopolymers. The prior art has generally proven effective with regard to the resource-efficient production of adhesive tapes, and in particular cable wrapping tapes of the structure described in the introduction. However, the PET bottles used as raw materials in the generic prior art according to EP 4092092 A1 are also used for recycling purposes in other ways. Often, the bottles in question are even completely recycled, so that a decreasing quantity of suitable raw materials must be expected in the future. The invention aims to remedy this situation. The invention is based on the technical problem of further developing such an adhesive tape, and in particular a wrapping tape for wrapping cables in automobiles, in such a way that a plastic recyclate can be used in the production of the textile carrier, which completely or at least largely avoids PET bottles. To solve this technical problem, a generic adhesive tape and in particular wrapping tape according to the preamble is characterized in that the plastic recyclate is made from textile waste. According to the invention, at least 50% by weight of the recycled fibers in the production of the textile carrier result from textile waste. In addition, so-called virgin fibers from the relevant source can also be used in principle for the production of the fibers to realize the textile carrier in question. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) Plastics are used. Furthermore, it is conceivable that, in addition to at least 50% by weight from textile waste, the textile carrier also utilizes recycled plastics from, for example, PET bottles (PET = polyethylene terephthalate), if the textile carrier is made of polyester and especially PET. This is usually the case because polyester and PET fibers are characterized by excellent mechanical properties, chemical stability, and a high melting point. Moreover, most textile waste is made from such PET fibers. Therefore, the textile waste in question is ideally suited for use in the production of a textile carrier in conjunction with an adhesive tape, and especially for wrapping cables in automobiles. This also applies, and especially so, given that polyester or PET carriers in adhesive tapes generally possess high abrasion resistance and a low tendency to flag, as described in the prior art according to EP 4092092 A1. However, it has been found that such properties are also observed and present when the textile carrier is made from at least 50 wt.% recycled PET from textile waste, based on the basis weight of the carrier. Comparable mechanical values ​​are observed for such carriers made from at least 50 wt.% recycled PET (from textile waste) as those found for textile carriers made from virgin PET fibers (i.e., petroleum-based). In fact, textile carriers realized in this way, based on at least 50 wt% recycled PET from textile waste, are characterized by comparable tensile strengths to those observed for textile carriers made from virgin PET fibers. That is, a maximum tensile strength in the range of 30 N / cm to 40 N / cm, which is comparable to PET carriers made from virgin PET fibers. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 4 This applies to virgin fibers. Furthermore, the elongation at break, at 20% to 30%, is also in the same range as that of a PET carrier made from virgin fibers. The same standards as in the prior art according to EP 4092092 A1 are used for measuring maximum tensile strength and elongation at break. This means that, according to the invention, it has been found that recycled plastics, and particularly preferably recycled PET from PET textile waste, can be used to obtain recycled fibers. These fibers can then be advantageously used to produce a textile backing for adhesive tape, and especially for wrapping cables in automobiles, because comparable mechanical properties are observed as for textile backings made from virgin PET fibers. The textile backing can be designed in any way, for example as a nonwoven, knitted, or, in particular, woven fabric. Multilayer backings are also conceivable in principle. The adhesive coating, applied to at least one side, is generally based on an acrylate hot melt adhesive. Alternatively, a synthetic rubber adhesive can also be used. To prepare the textile waste in question for the application according to the invention, there are basically two different possibilities. In a first alternative, the invention provides that the plastic recyclate, and in particular PET recyclate, is obtained mechanically, for example by shredding, from textile production waste and / or used textiles. This textile production waste and / or used textiles can be waste from textile production, but also... Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 5 Used clothing, shoes, etc. Even seat covers from automobiles or railway carriages can be recycled in this context, because these are usually made of polyester fibers or PET fibers due to the necessary abrasion. In this context, the invention for the mechanical shredding of recycled plastics, and in particular recycled PET, generally utilizes a shredder with at least one rotating drum equipped with circumferential pins. The pins ensure that the textile waste fed via a conveyor belt is shredded. For this purpose, the drum with the circumferential pins generally interacts with an edge over which the textile waste is fed. The feeding of the textile waste to the edge, and thus to the drum, can be achieved and implemented using a conveyor belt. In principle, two adjacent counter-rotating drums, each with interlocking pins, can also be used. The recycled PET fibers obtained in this way using the shredder can then be separated into individual fractions with fibers of the same length and thickness range. This is achieved using well-known and established methods, such as screen separation. As a result, the output of the shredder generally contains a fiber mixture in which at least 80% by weight, and in particular 90% by weight or more, of the recycled fibers or recycled PET fibers have a length of approximately 55 mm to 75 mm. Their thickness can be approximately 3 dtex. Other thicknesses or finenesses from 2 to 10 dtex are also conceivable. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) Fibers of the specified lengths can easily be processed into a textile substrate. This can be done by using the recycled fibers, specifically recycled PET fibers, to produce a nonwoven fabric, laying them on a screen belt and compacting them if necessary. Alternatively, yarns can be spun from the fiber mixture. In this case, the recycled fibers, resulting from the mechanical shredding of textile waste, are typically staple fibers. However, these can also be processed into continuous filaments or yarns, thus enabling the fabrication of textile substrates. An alternative to the mechanical processing of textile waste involves obtaining recycled plastic by melting down textile production waste and / or used textiles. Naturally, the described processes for fiber production, as well as the melting and the resulting fiber or filament production, can also be combined. In this context, as with all mechanical shredding processes, the procedure begins with collecting the recycled plastic or textile waste before melting or mechanical shredding. The resulting waste textiles and / or textile production waste—that is, all textile waste—are then mechanically shredded, both when they are subsequently melted down and when the mechanically shredded fibers are used directly for manufacturing the textile backing—without further melting. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) After the mechanical shredding of the recycled plastic, generally in the shredding machine described earlier, impurities are subsequently removed. For this purpose, the mechanically shredded fibers are passed through a filter device, which retains contaminants such as textile waste, foreign materials, etc., preventing them from being further processed. The resulting shredded plastic recyclate, or in the case of the shredder, the fibers, is then melted. However, it is also possible to use other methods for mechanical shredding instead of a shredder, for example, shredding the textile waste in a tearing machine. In either case, the second basic procedure involves melting down the shredded textile waste or the resulting shredded plastic recyclate. This can be done by producing so-called "flakes" of plastic recyclate or PET recyclate after shredding the textile waste, which are then melted down. It goes without saying that, if necessary, further filtration equipment can be installed upstream to remove not only inorganic contaminants but also organic contaminants such as other plastics. In any case, the shredded plastic recyclate is then fed into a compounder, a device in which it is mixed with additives.The compounder in question can also be combined with a subsequently used extruder, and in particular a twin-screw extruder. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 8 The invention works by adding a so-called chain extender to the melt or the shredded recycled plastic to ensure subsequent processing by extrusion. The chain extender in question is advantageously carbonyl biscaprolactam (CBC), which is advantageously added in a concentration of 0.2 wt% to 2 wt%, based on 100 wt% of the recycled plastic. In addition, a low-melting-point additive is usually also used to ensure the extrusion properties of the melt. This additive is a copolyester, which is added in a concentration of 2 wt% to 10 wt%, based on 100 wt% of the recycled plastic. This copolyester is, in principle, also unnecessary. In addition to these one or two additives, it is of course also conceivable to add a dye to the shredded flakes of recycled plastic or PET. The invention is based on the understanding that textile waste can be of various colors, so a mixture of colors is to be expected during the subsequent production of the textile substrate. However, if carbon black or graphite is added to the mixing process, the desired color "black" can be achieved just as easily as any other conceivable color for the textile substrate. The melt is then produced either in the compounder or in the twin-screw extruder at a temperature of approximately 230 °C to 270 °C. As a result, the extruder in question, and in particular the twin-screw extruder, provides filaments on the output side, which can subsequently be further processed into the textile substrate. This also includes the possibility of comminuting the filaments into staple fibers. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) Surprisingly, comparable mechanical properties were observed for an adhesive tape, and especially a wrapping tape, made from the textile carrier of the adhesive coating in question, as are known for virgin fibers from petroleum-based PET. This applies not only to the previously mentioned maximum tensile strength in the longitudinal direction, ranging from 30 N / cm to 40 N / cm, and the observed elongation at break in the longitudinal direction, ranging from 20% to 30%, but also, fundamentally, to comparable abrasion resistance, which is particularly relevant for the intended application of wrapping cables. In fact, in this context, the following was observed for a realized nonwoven carrier with a basis weight of approximately 70 g / m². 2consisting of PET fibers with a length of 60 mm to 65 mm and a thickness of 3 dtex, and taking into account a PET sewing thread of 50 dtex strength (9 threads / cm nonwoven width), an abrasion resistance on a dome with a 5 mm diameter according to the standard LV 312-1 “Protection systems for power sets in motor vehicles, adhesive tapes; test guideline” (10 / 2009) of regularly 5 double strokes to 10 double strokes. The invention will now be explained in more detail with reference to a drawing that illustrates only one embodiment; the drawing shows: Fig. 1 shows a shredder according to the invention for the mechanical shredding of textile waste and Fig. 2 schematically shows the production of the textile carrier from the textile waste. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 10 Figure 1 shows a shredder 1, which can be used to mechanically shred textile waste. The shredder 1 in question is also used at the input stage in the basic procedure shown in Figure 2. This requires, firstly, that the textile waste to be processed is collected and then fed onto a continuously driven infeed conveyor 2. The textile waste is conveyed by the infeed conveyor 2 in the direction of the arrow indicated in Fig. 1, towards a pre-pressure roller 3, which is generally unnecessary. The textile waste is then fed to a pair of rollers 4 and 5. Roller 4 has a smooth circumference to prevent individual pieces of textile waste from falling off. The additional feed roller 5, on the other hand, can have a profiled outer surface. The feed roller 5 is covered in its upper area by a sealing element 6 and acts against a stationary trough 7 on its underside, at the upper end of which an edge 8 is provided. The textile waste is guided over the edge 8 into a drum 9, which in turn is equipped around its circumference or on its surface with a plurality of pins 10. This allows the respective workpiece, or in this example a part of a textile waste made of PET, to be torn open using the pins 10 from the applied textile material in the area of ​​the stationary edge 8 and is then available in the form of fibers or flakes and is picked up with the pins 10. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 11 If the flakes or fibers around the circumference of the drum 9 have a significant mass, they are collected in a separation chamber 11 on the underside of the drum 9 and can then be fed back around the circumference onto the infeed conveyor 2. This is not shown in detail. The material picked up and shredded by the pins 10 of the drum 9 also enters a channel 12. This causes the shredded material to be flung into a receiving chamber 13, where it can then be picked up and carried around the circumference of a screen drum 14. The screen drum 14 is equipped with a discharge roller 15 and a conveyor 16, which allows the recycled plastic fibers, or fibers made primarily of PET, obtained in this way to be further processed.In addition, conveyor 16 may be followed by a classification unit, not shown in detail, in which the fibers are separated with respect to an equal length and thickness range. For example, a fiber mixture of recycled fibers is observed here, in which at least 80% and especially 90% or more of the recycled fibers have a length of approximately 55 mm to 75 mm. The fineness of the fibers may range from 2 dtex to 10 dtex. This fiber mixture can then be further processed, for example, into a nonwoven fabric backing by laying the fiber mixture on a screen belt, compacting it, and then attaching the sewing threads. This is, of course, only an example and is by no means mandatory. In the variant shown in Fig. 2, the plastic recyclate is obtained by melting down textile waste or textile production waste and / or used textiles. In this case, the textile waste is collected again and, for example, shredded in the 1a nd re je ws ki • h on ke Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 12 mechanically shredded. Alternatively, instead of shredding machine 1, one or more tearing machines can simply be used at this point to prepare the textile waste for melting. Following the shredding machine 1, which can be designed as shown in Fig. 1, the mechanically shredded textile waste, and in particular PET waste, is fed to a washing and / or filtering unit 17. Here, the shredded textile waste is washed and freed from impurities. An additional filtering process can also be provided to remove, for example, excessively large components of the recycled plastic. Following the washing and / or filtering device 17, the plastic recyclate processed in this way is fed to a mixing chamber or compounder 18, where it is combined with additives 19. These additives 19 can be the previously mentioned CBC, copolyester, and / or a colorant. Alternatively, the mixing chamber 18 can be integrated into or combined with a subsequent extruder 20. For this purpose, the extruder 20 can be a twin-screw extruder 20. At the output of the extruder 20, continuous filaments made from the molten plastic recyclate, derived from textile waste and especially PET recyclate, are available.The continuous filaments can then be further processed into staple fibers or yarn, which can subsequently be woven into a fabric as a textile backing for the adhesive tape. The adhesive tape produced in this way is used in particular as wrapping tape for cables in automobiles. For this purpose, the wrapping tape in question is either [andrejewski • honk e.g.] Patent and legal attorneys PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28 172 / Lu / Nu) The tape is folded over the cables to be bundled in a spiral shape or as a longitudinal fold and glued either to the cables, to itself, or to both. This is generally known.

Claims

and re je ws ki • h on ke Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) Patent claims:

1. Adhesive tape, in particular wrapping tape for wrapping cables in automobiles, with a textile carrier and with an adhesive coating on at least one side of the carrier, wherein the textile carrier is at least partially made from a recycled plastic, and wherein the proportion of recycled fibers in the textile carrier is at least 50 wt.%, based on the basis weight of the carrier, characterized by the fact that The plastic recyclate is made from textile waste.

2. Adhesive tape according to claim 1, characterized in that the plastic recyclate is obtained mechanically by, for example, shredding from textile production waste and / or used textiles.

3. Adhesive tape according to claim 2, characterized in that a shredding machine (1) is provided with at least one rotating drum (9) with circumferential pins (10) which shreds the textile waste supplied via an infeed belt (2).

4. Adhesive tape according to claim 1, characterized in that the drum (9) interacts with an edge (8) via which the textile waste is fed.

5. Adhesive tape according to one of claims 1 to 4, characterized in that the recovered recycled fibers are separated into individual fractions with fibers of the same length and thickness range. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 2 6. Adhesive tape according to claim 5, characterized in that at least 80%, preferably 90% and more of the recycled fibers in the fiber mixture have a length of approximately 55 mm to 75 mm and preferably a thickness of, for example, 3 dtex.

7. Adhesive tape according to one of claims 1 to 6, characterized in that the plastic recyclate is obtained by melting down textile production waste and / or used textiles.

8. Adhesive tape according to one of claims 1 to 7, characterized in that the plastic recyclate is collected before melting and is first and preferably mechanically shredded in the shredder (1) and any impurities are subsequently removed in a washing-Z filter device (17).

9. Adhesive tape according to one of claims 1 to 8, characterized in that at least one chain extender is added to the shredded plastic recyclate.

10. Adhesive tape according to one of claims 1 to 9, characterized in that an additive with a low melting point is added to the shredded plastic recyclate to ensure the extrusion capability of the melt.

11. Adhesive tape according to one of claims 1 to 10, characterized in that the melt is generated in a compounder (18) at approximately 230 °C to 270 °C. Patent and lawyers PCT patent application January 20, 2026 certoplast Technische Klebebänder GmbH (X 28172 / Lu / Nu) 3 12. Adhesive tape according to claim 11, characterized in that the compounder (18) is a component of an extruder (20) and in particular a twin-screw extruder (20).

13. Adhesive tape according to one of claims 1 to 12, characterized in that the chain extender is present in a grammage of 0.5 wt.% to 2 wt.%, based on the weight of the shredded plastic recyclate.

14. Adhesive tape according to one of claims 1 to 13, characterized in that the low melting point additive is present in a grammage of 2 wt.% to 10 wt.%, based on the weight of the shredded plastic recyclate.

15. Adhesive tape according to one of claims 1 to 14, characterized in that the textile carrier or the adhesive tape as a whole has a maximum tensile strength of 30 N / cm to 40 N / cm and an elongation at break preferably of 20% to 30%.

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