CN109988514B

CN109988514B - Wear-resistant fabric adhesive tape

Info

Publication number: CN109988514B
Application number: CN201811580819.4A
Authority: CN
Inventors: A.施密德林; M.霍普夫
Original assignee: Tesa SE
Current assignee: Tesa SE
Priority date: 2017-12-22
Filing date: 2018-12-24
Publication date: 2021-10-08
Anticipated expiration: 2038-12-24
Also published as: CN109988514A; DE102017223666B4; DE102017223666A1

Abstract

The invention relates to a particularly wear-resistant fabric for covering elongate articles, wherein the fabric is provided at least partially with an adhesive layer on at least one side when the thread material of the fabric is at least partially composed of elastic fibers. Fibres made entirely or predominantly of polyurethane are particularly suitable in this case.

Description

Wear-resistant fabric adhesive tape

Technical Field

The invention relates to the use of a textile for covering an elongate article, wherein the textile is at least partially provided with an adhesive layer on at least one side.

Background

In many industrial fields, bundles of a plurality of electrical conductors are wound before installation or in the already assembled state in order to reduce the space requirement of the conductor bundles by means of bandaging (bandaging) and additionally to achieve a protective function. The film adhesive tape is used for realizing certain protection against liquid entering, the fluffy and bulky adhesive tape based on a thick non-woven fabric material or a foam material as a carrier is used for obtaining damping performance, and when a wear-resistant and stable carrier material is used, the protection function against scraping and friction is realized.

The testing and sorting of adhesive tapes for cable sheathing is carried out in the motor vehicle industry according to a wide range of standards organizations (Normenwerken), for example the delivery statement LV312-1 "Schutzsystem fur

in Kraftfahrzeugen,

Pr ü frichtlinie "(10/2009), as a joint standard from Daimler, Audi, BMW and Volkswagen, or the Ford Specification ES-XU5T-1A303-aa (revision 05/2017)" Harness Tape Performance Specification ". In the following, these standards are referred to simply as the LV312 and Ford specifications, respectively.

Abrasion resistance is a measure of the resistance of an adhesive tape to abrasion. International standard ISO 6722, chapter 9.3 "scrub abrasion test" (4-month edition 2002) has created a method of determining the wear resistance of a protection system in a vehicle electrical apparatus. The abrasion resistance of the tape was tested according to LV312, based on standard ISO 6722. A test specimen having a length of about 10cm was bonded in a single layer manner in the longitudinal direction to a 5 or 10mm thick steel mandrel. The wear tool is a steel wire with a diameter of 0.45mm, which rubs centrally on the test specimen under a weight load of 7N. As a measure of wear performance, the number of two strokes was determined until the specimen was destroyed. For fabrics, the direction of motion of the steel filaments is oriented parallel to the warp threads.

The test results are referred to as the wear rating (abrasion resistance rating) of the test specimen under the name of spindle diameter and weight load. According to table 1, the tapes are classified into categories a to F.

With a spindle diameter of 5mm, the sample is typically destroyed with fewer strokes than with a 10mm spindle diameter. Thus, the tape can achieve, for example, a wear rating D at 10mm and a wear rating C at 5 mm.

Table 1: classification according to wear level of LV312

A highly abrasion resistant tape is a tape having an abrasion rating D.

Nowadays, for high wear protection, single-layer fabric tapes are generally used which consist of a fabric carrier (e.g. a polyester fabric) and an adhesive layer.

The carrier fabric is characterized by a thread material (e.g., polyester yarn), the thread weight of the thread (weight per length, in decitex (dtex), 1 decitex-1 g/10000m thread) and the thread density or thread count (number of threads per cm) or the fabric warp and weft density (number of threads per cm). The fabric consists of warp threads (longitudinal, machine direction, also corresponding to the longitudinal direction of the adhesive tape made therefrom) and weft threads (transverse threads). The wires are usually connected (woven) in a plain weave. Other types of weaves include satin weaves (also known as satins, regular and irregular forms) and twill weaves. Twill woven fabrics (e.g., "2 in 1 twill") form so-called twill lines

Which extends diagonally in the machine direction. Fabrics woven in twill weave are generally somewhat softer than the same fabrics woven in plain weave. Particularly in the diagonal direction, the bending stiffness is low. This is an advantage for tapes made therefrom.

The fabric may then be dyed or spun-dyed

The yarn composition of (1).

The thread may consist of spun yarn (gesponenen yarn) or filament yarn (Endlosgarnen yarn). Filament yarns are generally used. It consists of a fixed number of individual filaments and may be textured or smooth and point consolidated or loose (unconsolidated ).

The fibers are used to make yarns. Here, two types of fibers are distinguished.

There are short fibers (the term staple fibres is used synonymously) which have a finite length.

Furthermore, there are also continuous fibers, also called filaments (monofilaments), which have an almost infinite length. Filament refers to the textile technology term, which is understood to mean almost continuous fibers produced by chemical technical means according to various methods as constituent parts of filament yarns and cables. A filament yarn consisting of a plurality of filaments is called a multifilament yarn, and a filament yarn consisting of only one filament is called a monofilament yarn.

The cd of the fabric is the number of cd threads per centimeter (weft) multiplied by the thread weight of the cd threads in decitex. The units are decitex/centimeter (dtex/cm).

Longitudinal denier is the number of longitudinal threads per centimeter (warp threads) multiplied by the thread weight of the longitudinal threads in decitex. The units are also decitex/cm.

The basis weight of the fabric is finally obtained from the yarns used, their number and the type of knitting.

The polyester fabric used as a carrier for the cable-winding tape generally has 60 to 180g/m²Is not only a sheetBit area weight. The abrasion resistance of the adhesive tape increases with the weight per unit area of the polyester fabric used.

Commercially available cable-winding tapes with high wear ratings are based on a solid carrier material with correspondingly thick yarns. Common yarn count

167 to 330 dtex in the machine and cross direction.

Polyester fabric tapes with abrasion protection for cable wrapping are known. They are under the trade name "

51026 "or" Coroplast 837X "is used as a cable wrap. They have a molecular weight of 125 to 135g/m²Weight per unit area of 80 to 100g/m²The adhesive layer of (a). The warp and weft yarns have the same yarn weight of about 167 dtex. Due to the numerous warp threads with high yarn weight, the adhesive tape is highly wear resistant, so that wear class D is met at a mandrel diameter of 5mm according to LV 312.

A disadvantage of these known adhesive tapes is that they are very stiff in the longitudinal direction (i.e. machine direction) due to the very many and thick warp threads of the fabric used. The stiffness in the longitudinal direction has the disadvantage in the application of the adhesive tape as a cable-wrapping tape that the tape end tends to protrude (bulge) over time. This behavior is called tilting (abllaggen) or edge tilting (Flagging). This behavior is facilitated by the high stiffness of the tape in the longitudinal direction and the small diameter of the wrapped article.

The high adhesive strength of the tape to the back of itself after application reduces the tendency to edge lifting. High bond strengths require, among other things, high adhesive application rates of the adhesive tape and adhesives designed for high bond strengths.

In the case of softer fabric weaves, such as twill weaves, the tendency to cocking may be reduced due to the reduced bending stiffness.

EP 2298845 a1 discloses an adhesive tape comprising a carrier and an adhesive layer applied to at least one side, the carrier being a textile, preferably a polyester textile.

It is essential to the invention that the quotient of the length-related titre of the transverse threads and the width-related titre of the longitudinal threads is between 2.2 and 6, preferably between 2.8 and 4, and that the support has a titre of greater than or equal to 110g/m²Weight per unit area of (c).

EP 2441813 a1 describes a wear-resistant adhesive tape having at least one strip-shaped carrier on which an adhesive layer made of a pressure-sensitive adhesive is applied at least on one side. The adhesive layer is completely or partially covered by the liner. It is essential to the invention that the carrier is formed from satin. Further, the satin fabric is characterized by a number of weaving repetitions (bindungrapport) greater than 2 and a fly number (steigingszahl) greater than or equal to 1.

EP 2050802 a1 discloses a mechanically stable but at the same time hand-tearable adhesive tape. In this adhesive tape, different yarn materials are used for the warp and weft. However, adhesive tapes can only meet the high requirements for abrasion resistance to a limited extent.

Disclosure of Invention

The object of the present invention is to achieve a significant improvement over the prior art and to provide a belt which is capable of bundling individual conductors into a cable bundle with a high degree of protection against mechanical damage caused by scratches and friction at sharp edges, burrs or welding points, and at the same time is sufficiently flexible to be able to smoothly wrap elongate articles. Furthermore, it is desirable that the material has as low a weight as possible while having strength and wear resistance.

This object is achieved by using a fabric as described in the independent claims. Advantageous embodiments of the invention are described in the dependent claims. Furthermore, the invention comprises a cable bundle coated with said fabric.

The invention therefore relates to a use of the aforementioned type, wherein the threads of the fabric consist at least partially of elastic fibres.

Elastic fibers are understood to mean those fibers which are capable of being reversibly stretched without plastic deformation. The degree of elasticity can be carried out in accordance with DIN 53835, parts 1 to 4, in which the test specimen is loaded and the recovery and deformation relative to the original state are measured after release. The test relates to yarns and does not describe a flat material (sheet) that can also be made elastic by a knitting method.

Spandex fibers (elastane fibers), elastane fibers (elastane fibers) or rubber fibers are used in particular as elastic fibers. Spandex fibers are understood to be synthetic filament yarns which consist to the extent of at least 85% by weight of Polyurethane (PU). They may be trademarks

Or

And (4) obtaining.

Surprisingly, it has been found that a high wear resistance can be achieved when using a textile carrier in which the thread material is at least partly composed of an elastic material, wherein the textile at the same time remains flexible to ensure good processing. The wear resistance here amounts to a wear rating D measured according to standard LV312 on a 10mm spindle and to a wear rating D measured according to LV312 on a spindle having a diameter of 5 mm.

In a particularly suitable embodiment, the weft threads consist at least partially of elastic fibers. Known yarns are used in the warp direction which have generally low tensile properties and no elasticity. In this way, conventional weaving machines can be used, and the fabric can also be processed in conventional coating and cutting devices, in particular also in those devices in which it is drawn off in the longitudinal direction. This results in a fabric that has a large elasticity in one direction and good strength in the other direction.

Due to the elasticity, the fabric is particularly stretchable and has good recovery properties. Surprisingly, this also results in a fabric that is particularly abrasion resistant. This can be explained by the fact that: the fabric may stretch slightly elastically under the abrasive load and thus may withstand the load over a longer period of time.

The weft threads particularly advantageously consist at least partially of polyurethane. The polyurethane has the general formula:

they are particularly elastic, so that the fabric becomes particularly stretchable and has good recovery properties.

Particularly preferably, a thread with a polyurethane core (so-called "coreyarn" (Coregarn)) is used as weft, wherein the core is wound with at least one filament consisting of at least one further material, wherein the further material is selected from the group consisting of cotton, viscose (Viskose), polyester, polyamide and polyolefin, wherein polyester is particularly preferred. Here, the additional material is loosely wound around the polyurethane core. Thus, for a given length of the polyurethane core, the weft thread has at least one filament of the further material which is longer in length. Preferably, the filaments of the further material have a length such that said length corresponds at least to the length of the polyurethane core at its maximum elongation (ausdehnnung).

As material for the warp threads, polyester yarns, polyamide yarns, polyolefin yarns, viscose yarns, cotton yarns or blended yarns of the mentioned materials are particularly suitable, polyester yarns being very particularly preferred. These materials impart good strength to the fabric; they also ensure that the fabric can be easily produced on conventional looms and further processed on conventional coating and cutting equipment.

The blended yarn according to the invention is understood to mean that the yarns for the warp and/or weft consist of different materials.

Preferably, the warp has a yarn weight of 80 to 280 dtex, preferably 150 to 230 dtex. More preferably, the weft has a yarn weight of 100 to 500 dtex, particularly preferably 180 to 280 dtex.

If a core-spun yarn is used, the following are particularly preferred: the yarn weight of the core is between 180 and 420 dtex, in particular 180 to 320 dtex, particularly suitable 200 to 270 dtex, and the yarn weight of the covering (covering) is 10 to 80 dtex, in particular 15 to 60 dtex, and particularly suitable 20 to 40 dtex.

According to another advantageous embodiment of the invention, the thread count in the warp direction is 34 to 60/cm, preferably 42 to 55/cm, and in particular 50 to 54/cm.

According to another advantageous embodiment of the invention, the thread count in the weft direction is 15 to 30/cm, preferably 20 to 27/cm, and in particular 22 to 26/cm.

The threads may consist of spun yarns or filament yarns (continuous yarns). Filament yarns are generally used. It consists of a fixed number of individual filaments and may be textured or smooth and point consolidated or loose (unconsolidated ). The fabric may then be dyed or consist of spin-dyed yarns.

More preferably, the thickness of the fabric is at most 400 μm, more preferably 180 to 280 μm, most preferably 220 to 280 μm.

According to the invention, "thickness" is understood to mean the magnitude of the layer or phase concerned along the z-coordinate of an imaginary coordinate system in which the plane defined by the machine direction and the transverse direction relative to the machine direction forms the x-y plane. The thickness was measured according to DIN EN 1942.

According to another advantageous embodiment of the invention, the support has at most 200g/m²Preferably 40 to 200g/m²More preferably 110 to 160g/m²Weight per unit area of (c).

The amount of adhesive applied based on the area of the tape is preferably between 40 and 160g/m²Between 50 and 100g/m, preferably²Between 60 and 90g/m, more preferably²In the meantime.

According to a preferred embodiment of the invention, the tape has a maximum tensile force measured according to DIN EN 14410 of less than 350N/cm, preferably between 150 and 280N/cm.

For the production of adhesive tapes from the carrier, all known adhesive systems can be used. In addition to adhesives based on natural or synthetic rubbers, use may in particular be made of silicone adhesives and also polyacrylate adhesives, the latter being particularly preferred. The same adhesive system is also used for the adhesive strips on the jacket.

The adhesive is preferably a pressure sensitive adhesive, i.e., a viscoelastic material, which remains permanently tacky and tacky in the dry state at room temperature. Bonding is performed by slight pressure on almost all substrates.

Particularly suitable adhesives are low molecular weight acrylate hot melt pressure sensitive adhesives such as those supplied by BASF under the name acResin UV. The adhesives with low K values acquire their application-compatible properties through a final radiation-chemically induced crosslinking.

Other very suitable adhesives are described in EP 2520627 a1, EP 2522705 a1, EP 2520628 a1, EP 2695926 a1 and EP 2520629 a 1.

Particularly preferred are pressure-sensitive adhesives in the form of a dry polymer dispersion, wherein the polymer consists of:

(a)95.0 to 100.0% by weight of n-butyl acrylate and/or 2-ethylhexyl acrylate

(b)0.0 to 5.0% by weight of an ethylenically unsaturated monomer having acid or anhydride functionality

Preferably, the polymer is composed of 95.0 to 99.5 wt.% of n-butyl acrylate and/or 2-ethylhexyl acrylate and 0.5 to 5 wt.% of ethylenically unsaturated monomers having acid or anhydride functionality, more preferably 98.0 to 99.0 wt.% of n-butyl acrylate and/or 2-ethylhexyl acrylate and 1.0 to 2.0 wt.% of ethylenically unsaturated monomers having acid or anhydride functionality.

In addition to the acrylate polymers listed, tackifiers and/or additives such as light stabilizers or aging inhibitors may additionally be added to the pressure-sensitive adhesive in addition to any residual monomers which may be present. In particular, no additional polymers such as elastomers are included in the pressure-sensitive adhesive, that is to say the polymers of the pressure-sensitive adhesive consist only of the monomers (a) and (b) in the given quantitative ratios.

Preferably, n-butyl acrylate forms monomer (a).

Advantageous monomers (b) are, for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid and/or maleic anhydride.

Preferred are (meth) acrylic acids of the formula I,

wherein R is³H or CH₃It is preferred to use a mixture of acrylic acid or methacrylic acid, if desired. Acrylic acid is particularly preferred.

According to a particularly preferred variant, the polymer has the following composition:

(a)95.0 to 100.0% by weight, preferably 95.0 to 99.5% by weight, more preferably 98.0 to 99.0% by weight of n-butyl acrylate, and

(b)0.0 to 5.0 wt%, preferably 0.5 to 5.0 wt%, more preferably 1.0 to 2.0 wt% of acrylic acid.

The polymer dispersion is prepared by an emulsion polymerization process of the components. A description of this method can be found, for example, in "Emulsion Polymerization and Emulsion Polymers", Wiley-VCH 1997-ISBN 0-471-96746-7 or EP 1378527B 1 by Peter A.Lovell and Mohamed S.El-Aasser.

It cannot be excluded in the polymerization that not all monomers are converted into polymers. Here, it is clear that the residual monomer content should be as small as possible. Preference is given to adhesives comprising polymer dispersions having a residual monomer content (based on the mass of the dried polymer dispersion) of less than or equal to 1% by weight, in particular less than or equal to 0.5% by weight.

As generally understood in the art, "tackifier resin" refers to an oligomeric or polymeric resin that increases the self-adhesion (tack, inherent tack) of a pressure sensitive adhesive as compared to an otherwise identical pressure sensitive adhesive without the tackifier resin.

It is known in principle to use tackifiers to increase the adhesive strength of pressure-sensitive adhesives. This effect also occurs when up to 15 parts by weight (corresponding to <15 parts by weight) or 5 to 15 parts by weight of tackifier (based on the mass of the dried polymer dispersion) are added to the adhesive. Preferably 5 to 12 parts by weight, more preferably 6 to 10 parts by weight of tackifier (based on the mass of the dry polymer dispersion) are added.

As tackifiers, also referred to as tackifier resins, in principle all known substance classes are suitable. Tackifiers are for example: hydrocarbon resins (e.g. based on unsaturated C)₅Or C₉Polymers of monomers); terpene phenolic resin; polyterpene resins based on raw materials such as alpha-or beta-pinene; aromatic resins such as coumarone-indene resin; or resins based on styrene or alpha-methylstyrene, such as rosins and derivatives thereof, for example disproportionated, dimerized or esterified rosins, for example reaction products with ethylene glycol, glycerol or pentaerythritol, to name a few. Preferred are resins which are free of double bonds which are susceptible to oxidation, for example terpene phenolic resins, aromatic resins, and particularly preferably resins produced by hydrogenation, such as hydrogenated aromatic resins, hydrogenated polycyclopentadiene resins, hydrogenated rosin derivatives or hydrogenated polyterpene resins.

Preferred are resins based on terpene phenolics and rosin esters. Also preferred are tackifier resins having a softening point of greater than 80 ℃ according to ASTM E28-99 (2009). Particularly preferred are terpene phenolic and rosin ester based resins having a softening point of greater than 90 ℃ according to ASTM E28-99 (2009). The resin is effectively used in dispersion form. In this way, they can be easily mixed in finely divided form with the polymer dispersion.

Particularly preferred is a modification in which no tackifier resin is added at all to the pressure-sensitive adhesive. Surprisingly and unpredictably to the skilled person, the lack of tackifier resin in the tape does not result in insufficient adhesion as the skilled person would have expected. Furthermore, surprisingly, the edge lifting behavior is also not worse.

Specifically, the following were not added to the pressure-sensitive adhesive:

hydrocarbon resins (e.g. based on unsaturated C)₅Or C₉Polymers of monomers)

Terpene phenolic resin

Polyterpene resins based on raw materials such as alpha-or beta-pinene

Aromatic resins, such as coumarone-indene resins, or resins based on styrene or alpha-methylstyrene, such as rosins and their derivatives, for example disproportionated, dimerized or esterified rosins, for example reaction products with ethylene glycol, glycerol or pentaerythritol.

It is also preferred that the adhesive coating consists of an adhesive based on synthetic rubber, i.e. an adhesive consisting in particular of at least one vinyl aromatic block copolymer and at least one tackifier resin. Typical use concentrations of the block copolymers are in the concentration range from 30 to 70% by weight, in particular in the concentration range from 35 to 55% by weight.

Other polymers that can be used are those based on pure hydrocarbons, such as: unsaturated polydienes, such as natural or synthetically prepared polyisoprene or polybutadiene; chemically substantially saturated elastomers, such as saturated ethylene-propylene copolymers, alpha-olefin copolymers, polyisobutylene, butyl rubber, ethylene-propylene rubber, and chemically functionalized hydrocarbons, such as halogen-containing, acrylate-containing or vinyl ether-containing polyolefins, may replace the vinyl aromatic-containing block copolymers to up to half the extent.

Tackifier resins compatible with the elastomeric blocks of the styrenic block copolymer are used as tackifiers.

As further additives, light stabilizers, such as UV absorbers, sterically hindered amines, antiozonants, metal deactivators, processing aids, end-block reinforcing resins, can generally be used.

Plasticizers are generally used, for example: a liquid resin; a plasticizer oil; or low molecular weight liquid polymers, for example low molecular weight polyisobutenes or liquid EPDM types having a molecular weight (molar mass) of <1500g/mol (number average).

Fillers such as silica, glass (ground or in the form of spheres), alumina, zinc oxide, calcium carbonate, titanium dioxide, carbon black, to name a few, pigments and dyes, and optical brighteners can also be used.

Typically, primary (primary) and secondary (secondary) antioxidants are added to the pressure sensitive adhesive to improve its aging stability. The primary antioxidants here react with oxygen radicals and peroxy radicals, which can be formed in the presence of oxygen, and with them form less reactive compounds. Secondary antioxidants reduce, for example, hydroperoxides to alcohols. It is known that there is a synergistic effect between the primary and secondary age resistors, such that the protective effect of the mixture is generally greater than the sum of the two individual effects.

If low flammability of the tape is desired, this can be achieved by adding a flame retardant to the carrier and/or adhesive. These flame retardants can be organic bromine compounds, optionally together with synergists such as antimony trioxide, however, in view of the fact that the adhesive tape is halogen-free, it is preferred to use red phosphorus, organic phosphorus, mineral-type or intumescent compounds such as ammonium polyphosphate, alone or in combination with synergists.

The preparation and processing of the pressure-sensitive adhesives can be carried out from solutions, dispersions and from melts. The preferred method of preparation and processing is from the melt. For the latter case, suitable preparation processes include batch and continuous processes.

The adhesive may be applied partially, for example in the form of a strip in the longitudinal direction of the tape, said strip having a smaller width than the carrier of the tape.

Depending on the application, a plurality of parallel strips of adhesive may also be applied to the carrier material.

The position of the strip on the carrier is freely selectable, wherein an arrangement directly on one edge of the carrier is preferred.

On the adhesive coating of the carrier, at least one cover strip may be provided, which extends in the longitudinal direction of the tape and covers 20% to 80% of the adhesive coating.

According to a preferred embodiment of the invention, there is exactly one cover strip on the adhesive coating.

The position of the strip on the adhesive coating is arbitrary, wherein it is preferably arranged directly on one longitudinal edge of the carrier. In this way a strip of adhesive extending in the longitudinal direction of the adhesive tape is obtained, which ends at the other longitudinal edge of the carrier.

If the adhesive tape is used for covering the cable bundle in such a way that the adhesive tape is guided around the cable bundle in a helical movement, the covering of the cable bundle can be carried out in such a way that the adhesive of the adhesive tape only adheres to the adhesive tape itself, without the item coming into contact with any adhesive.

The bundle of cables thus coated has a very high flexibility, since the cables are not fixed by any adhesive. Thus, its flexibility during installation (especially in narrow passages or tight turns) is significantly increased.

If it is desired to secure the tape to the article, the wrapping can be done such that one portion of the strip of adhesive bonds to the tape itself and another portion bonds to the article.

According to a further advantageous embodiment, the strip is applied centrally on the adhesive coating, so that two adhesive strips are obtained which extend in the longitudinal direction of the adhesive tape on the longitudinal edges of the carrier.

In order to apply the adhesive tape around the cable bundle in said helical movement safely and economically and to prevent slipping of the resulting protective sheath, two strips of adhesive each present on the longitudinal edges of the adhesive tape are advantageous, in particular when the one which is generally narrower than the second strip is used as a fixing aid and the second, wider strip is used as a locking means. The adhesive tape is bonded to the cables in such a way that the cable bundle is prevented from slipping and is also designed flexibly.

Additionally, there are embodiments wherein more than one strip of cover is applied to the adhesive coating. If only one strip is mentioned, the skilled person will consider it to be entirely possible to have a plurality of strips covered with the adhesive coating at the same time.

Preferably, the strips cover in total 50% to 80% of the area of the adhesive coating. The degree of coverage is selected according to the application and the diameter of the cable bundle.

It is particularly preferred to leave one or two adhesive strips, the total width of which represents 20 to 50% of the width of the carrier.

Particularly advantageous is a variant in which two adhesive strips are present in each case in the edge region of the carrier, which extends in the machine direction. The edges of the carrier or the outer edges of the adhesive strip are preferably positioned edge to edge with respect to each other.

The sum of the widths of the adhesive strips is at most 50% of the width of the carrier, based on the width of the carrier in the transverse direction.

Preferably, the strips have the same width.

In particular, if the application of the adhesive is not carried out over the entire face, but for example in the form of a strip, the percentages given refer to the percentage of the width of the cover strip relative to the width of the carrier, i.e. according to the invention, the cover strip width amounts to 20 to 80% of the carrier width.

The adhesive thus prepared can then be applied to a support using generally known methods. When processing from the melt, these may be application methods by nozzles or calenders.

In solution processes, coating with a doctor blade, knife or nozzle is known, to name a few.

The adhesive may also be transferred from an anti-adhesive carrier cloth or release liner to the carrier composite.

On the back side of the tape, a back coat (back coat) can be applied to favorably influence the unwinding properties of the tape wound into an archimedean spiral. The back-coat can be provided for this purpose with silicone or fluorosilicone compounds and polyvinyl stearamido formate, polyethylenimine stearyl urea or fluorine-containing organic compounds as release substances. The back coating should be used very sparingly, if at all, in order not to cause lifting of the subsequently bonded tape.

For the purposes of the present invention, the generic term "adhesive tape" encompasses all planar structures such as two-dimensionally extended film or film sections, tapes and tape sections with extended length and limited width, etc., and finally also die-cut pieces or labels.

The adhesive tape can be rolled up in the form of a roll, that is to say in the form of an archimedean spiral on itself, and can also be prepared as follows: on the adhesive side is covered with a release material such as siliconized paper or siliconized film. As release material, non-fluff (nicht-fuels) materials are preferred, such as plastic films or well-glued long-fiber papers.

Preferably, the adhesive tape is used for sheathing an elongate article, in particular a cable harness, wherein the elongate article is sheathed with the adhesive tape in the axial direction or the adhesive tape is guided around the elongate article in a helical movement. This results in the shape of a volute (Helix) (also known as a Helix, cylindrical Helix or spiral (Wendel); a volute is a curve that wraps around the outer shell of a cylinder at a constant pitch).

Finally, the inventive concept also includes an elongated article covered with the adhesive tape according to the invention. Preferably, the elongate article is a cable bundle.

In cable harness manufacture, slight stretching occurs due to the shape of the cable harness. The elasticity of the fabric/tape according to the invention in the transverse direction results in a particularly good fit of the tape to the cable shape. Even if transitioning from a thin portion to a thicker portion, the tape is snug and conformal (formnachhufree).

Due to its excellent suitability, the adhesive tape can be used in coverings consisting of a cover, wherein at least in the edge region of the cover there is a self-adhesive tape which is bonded to the cover in such a way that the adhesive tape extends over one longitudinal edge of the cover and preferably in the edge region which is narrower than the width of the cover. Such an embodiment is referred to as a "jacket".

In the case of sheathing applications, a piece of fabric (gewebesst uck) is present and an adhesive or laminating tape is applied to both lateral ends of the fabric in a single-sided manner parallel to the warp threads. In this application, the starting side is then applied with adhesive tape parallel to the direction of extension of the cable and wound around the cable bundle in the transverse direction. Here a snug winding and a flexible cable harness are required.

Such a product and its optimized embodiment are disclosed in EP 1312097 a 1. Further developments of the adhesive tape according to the invention, which are likewise very suitable for this purpose, are shown in EP 1300452 a2, DE 10229527 a1 and WO 2006108871 a 1. Also, the adhesive tape according to the invention can be used in a method as disclosed in EP 1367608 a 2.

Finally, WO 2016/023921a1, WO 2016/045890a1, EP 2627539 a1, EP 1315781 a1 and DE 102014114794 a1 and DE 10329994 a1 describe embodiments of adhesive tapes, which are also possible for the adhesive tape of the invention.

In some of the above-mentioned wraps, there is a carrier that is adhesive-free in addition to a carrier that is provided with an adhesive or adhesive strips. According to a preferred variant, these vectors then also consist of the vectors described according to the invention. Preferably, all textile carriers in the structure consist of the carriers described according to the invention.

Drawings

In the following, the adhesive tape will be explained in more detail with reference to a number of drawings, without wishing to cause any limitation.

The figures show:

figure 1 is a cross-section of the adhesive tape,

figure 2 shows the fabric forming the carrier,

fig. 3a portion of a cable bundle, consisting of a bundle of individual cables and covered with an adhesive tape according to the invention,

fig. 3b a part of a cable bundle, consisting of a bundle of individual cables and being coated with an adhesive tape according to the invention,

figure 4 is a photograph of an elastic fabric according to the present invention with exposed warp threads,

figure 5 photo of an elastic fabric according to the invention with exposed weft threads,

FIG. 6 photo of weft (elastic polyurethane core, wrapped with PET yarn) of an elastic fabric according to the invention in the unstretched state,

fig. 7 photo of weft (elastic polyurethane core, wrapped with PET yarn) of elastic fabric according to the invention in stretched state.

Detailed Description

The adhesive tape according to the invention is shown in cross-section in fig. 1 and comprises a fabric carrier 10, on one side of which fabric carrier 10 a self-adhesive coating 12 is applied.

Figure 2 shows in detail the fabric forming the carrier 10. The fabric is characterized in that the weft threads (here shown in a wider form) are at least partially formed of polyurethane and therefore have a resilient design.

In fig. 3a and 3b, respectively, a part of a cable bundle is shown, which consists of a bundle of individual cables 7 and is covered with the adhesive tape according to the invention. The adhesive tape is guided in a helical movement around the cable bundle.

The portion of the cable bundle shown in fig. 3a shows two turns (Wicklungen) I and II of the tape. Other turns will extend to the left but are not shown here. On the adhesive coating, there is a covering strip 5, resulting in a strip 6 of adhesive extending in the longitudinal direction of the tape. The

non-adhesive areas

11,21,23 of the tape alternate with the

adhesive areas

12,22,24 (as opposed to the exposed adhesive 12, the

sections

22,24 are not visible from the outside, so a denser shade is chosen for display).

The sheathing of the cable bundle is done in such a way that the adhesive strip 6 adheres to the adhesive tape over the entire face. Adhesion to the cable 7 is excluded.

The part of the cable bundle shown in fig. 3b shows two turns I and II of the adhesive tape. Other turns will extend to the left but are not shown here.

The adhesive coating 12 is applied to the fabric carrier 10. The tape thus prepared is guided in a spiral-like movement around the cable, in which case the previous tape layer on the cable is covered with the tape provided on the basis of 20 to 50% of the tape width (in contrast to the exposed adhesive 12, the

sections

22,24 are not visible from the outside, so a denser shade is selected for display).

Fig. 4 shows a 25-fold magnified photograph of an elastic fabric of an adhesive tape according to the present invention, in which the warp is exposed by removing the weft. In contrast, fig. 5 shows a 25-fold magnified photograph of an elastic fabric of an adhesive tape according to the present invention, in which the weft threads are exposed and the warp threads are removed. The structure of the weft thread, which consists of a core around which the further thread is wound, can be very clearly identified.

The weft is shown in detail in figures 6 and 7. Fig. 6 shows the non-stretched weft threads and fig. 7 shows the weft threads in the stretched state. A core of an elastic polyurethane yarn wrapped with PET yarn is seen. Although the turns in the unstretched state (fig. 6) are relatively narrow, they are clearly pulled apart further relative to each other in the stretched state. In this way, the inelastic PET thread can participate in or allow the stretching of the polyurethane thread without restricting or even tearing the stretching.

Examples

Hereinafter, the present invention will be explained in more detail with reference to some examples and comparative examples, without wishing to limit the present invention in any way.

Here, the measurements were carried out according to the following criteria:

the weight per unit area of the fabric and of the adhesive coating is in accordance with DIN EN ISO 2286-1

Yarn weight according to DIN 53830T3

Fabric warp and weft density according to DIN EN 1049 part 2

Maximum tensile force and elongation at maximum tensile force of the fabric and the adhesive tape in the longitudinal direction to DIN EN 14410 at the maximum of the elongation at break curve (clamping length 100mm, pull speed 300 mm/min)

Adhesive force (bond strength, peel strength) to DIN EN 1939

The thickness of the fabric and of the adhesive tape is in accordance with DIN EN 1942/AFERA 4006

Abrasion resistance according to LV312-1 and ISO 6722

Measuring the flexural stiffness according to LV 312-1.

The preparation of the samples was carried out in each case by: a precursor fabric is first woven as a comparative example on a weaving machine with a predetermined warp thread (see description of the respective examples), wherein a conventional thread is used as weft. The weft is then replaced and the thread with the polyurethane core (fabric according to the invention) is used. Finally, a subsequent body fabric is formed

Wherein again conventional threads are used as weft threads.

An adhesive was applied to the fabric thus produced, as described for the various embodiments.

Example 1:

fabric V1A/precursor consisting of cotton in the warp and weft direction: FG 98g/m²

Fabric E1 with TPU yarns in the weft direction according to the invention: FG148g/m²

Weaving pattern laterally displaced (einspringen) (stretchable yarn woven under tension and displaced in width after weaving machine)

Fabric V1B composed of cotton in the warp and weft directions: FG100g/m²

Fabric V2A with increased number of warp threads on plain weave: FG144g/m²

Fabric with increased number of warp threads on porous (Panama ) fabric V2B:

FG142g/m²

description of the fabric:

sample preparation:

acrylate hotmelt 85g/m for UV crosslinking²Adhesive coating, whereby a sufficiently high adhesion is obtained.

Example 2:

description of the fabric:

sample preparation:

acresin 85g/m for UV crosslinking²Acrylate hotmelt adhesive coating, whereby sufficiently high adhesion is obtained.

Test of the tapes:

the examples show that the abrasion resistance of the fabric according to the invention is significantly higher than that of conventional fabrics, i.e. 3.5 to 6 times. Furthermore, the fabric according to the invention has a correspondingly greater elongation value in the transverse direction (in which direction the properties of the weft are active) at a defined tensile load of 5 or 10N/cm.

Bending stiffness of the wrapped bundle:

the cable bundle should be flexible enough to facilitate installation. In the sample test according to LV312-1, 40 wires (1.0 mm) having a length of 300mm are wound with an adhesive tape to be tested (preferably 19mm) in a spiral form with an overlap (overlap ratio) of 50%²) To prepare a sample. The maximum force (maximum strength) was measured in a 3-point bending test with an outer point distance of 100 mm:

Claims

1. use of a fabric adhesive tape for sheathing a cable bundle, wherein the fabric adhesive tape comprises a fabric carrier which is provided at least partially with an adhesive layer at least on one side, characterized in that the thread material of the fabric carrier consists at least partially of elastic fibers,

wherein the weft of the textile carrier is at least partially composed of elastic fibers of polyurethane,

wherein the weft has a core made of polyurethane and the core is wound with at least one filament composed of at least one further material, wherein the further material is selected from the group consisting of cotton, viscose, polyester, polyamide and polyolefin, and

polyester yarns were used as warp yarns.

2. Use according to claim 1, characterized in that the further material is polyester.

3. Use according to claim 1 or 2, characterized in that the number of threads in the warp direction is 34 to 60/cm and the number of threads in the weft direction is 15 to 30/cm.

4. Use according to claim 3, characterized in that the number of threads in the warp direction is 42 to 55/cm.

5. Use according to claim 3, characterized in that the number of threads in the warp direction is 50 to 54/cm.

6. Use according to claim 3, characterized in that the number of threads in the weft direction is between 20 and 27/cm.

7. Use according to claim 3, characterized in that the number of threads in the weft direction is 22 to 26/cm.

8. Use according to claim 1 or 2, characterized in that the adhesive layer is a self-adhesive layer.

9. Use according to claim 8, characterized in that the adhesive layer is based on natural or synthetic rubber, polyacrylate or polysiloxane.

10. Use according to claim 9, characterized in that the adhesive layer is based on polyacrylate.

11. Use according to claim 1 or 2, characterized in that the amount of adhesive applied is between 40 and 160g/m, based on the tape area.

12. Use according to claim 11, characterized in that the amount of adhesive applied is between 50 and 100 g/m.

13. Use according to claim 11, characterized in that the amount of adhesive applied is between 60 and 90 g/m.

14. Use according to claim 1 or 2, characterized in that the thickness of the carrier measured according to DIN EN 1942 is at most 400 μ ι η.

15. Use according to claim 14, characterized in that the thickness of the carrier measured according to DIN EN 1942 is 180 to 280 μm.

16. Use according to claim 14, characterized in that the thickness of the carrier measured according to DIN EN 1942 is 220 to 280 μm.

17. Use according to claim 1 or 2, characterized in that the carrier has at most 200g/m²Weight per unit area of (c).

18. Use according to claim 17, characterized in that the support has 40 to 200g/m²Weight per unit area of (c).

19. Use according to claim 17, characterized in that the support has 110 to 160g/m²Weight per unit area of (c).

20. Use according to claim 1 or 2, characterized in that the wear resistance of the adhesive tape, measured according to LV312 on a mandrel having a diameter of 10mm, meets at least wear grade D and/or the wear resistance of the adhesive tape, measured according to LV312 on a mandrel having a diameter of 5mm, meets at least wear grade D.

21. Use according to claim 1 or 2, characterized in that the textile adhesive tape is guided around the cable bundle along a spiral.

22. Use according to claim 1 or 2, characterized in that the cable bundle is coated in the axial direction by the fabric tape.

23. Use according to claim 1, characterised in that for a given length of the polyurethane core, the weft thread has at least one filament of another material which is longer in length.

24. Use according to claim 23, characterised in that the filaments of the further material have a length such that said length corresponds at least to the length of the polyurethane core at its maximum elongation.

25. Use according to claim 1, characterised in that the warp has a yarn weight of 80 to 280 dtex.

26. Use according to claim 25, characterised in that the warp has a yarn weight of 150 to 230 dtex.

27. Use according to claim 1, characterized in that the weft has a yarn weight of 100 to 500 dtex.

28. Use according to claim 27, characterised in that the weft has a yarn weight of 180 to 280 dtex.

29. Use according to claim 1, characterized in that the yarn weight of the core is between 180 and 420 dtex and the yarn weight of the covering is 10 to 80 dtex.

30. Use according to claim 29, characterized in that the yarn weight of the core is 180 to 320 dtex.

31. Use according to claim 30, characterized in that the yarn weight of the core is 200 to 270 dtex.

32. Use according to claim 29, characterized in that the yarn weight of the envelope is 15 to 60 dtex.

33. Use according to claim 32, characterized in that the yarn weight of the envelope is 20 to 40 dtex.

34. Use according to claim 1, characterized in that the adhesive tape has a maximum tensile force measured according to DIN EN 14410 of less than 350N/cm.

35. Use according to claim 34, characterized in that the tape has a maximum tensile force measured according to DIN EN 14410 of between 150 and 280N/cm.

36. Use according to claim 1, characterized in that the adhesive is a pressure-sensitive adhesive.

37. Use according to claim 36, characterized in that the pressure-sensitive adhesive is in the form of a dry polymer dispersion, wherein the polymer consists of:

(a)95.0 to 100.0% by weight of n-butyl acrylate and/or 2-ethylhexyl acrylate

(b)0.0 to 5.0 wt% of an ethylenically unsaturated monomer having acid or anhydride functionality.

38. Use according to claim 37, characterized in that the polymer is composed of 95.0 to 99.5% by weight of n-butyl acrylate and/or 2-ethylhexyl acrylate and 0.5 to 5% by weight of an ethylenically unsaturated monomer having an acid or anhydride function.

39. Use according to claim 38, characterized in that the polymer is composed of 98.0 to 99.0% by weight of n-butyl acrylate and/or 2-ethylhexyl acrylate and 1.0 to 2.0% by weight of an ethylenically unsaturated monomer having an acid or anhydride function.

40. Use according to claim 37, characterized in that n-butyl acrylate forms the monomer (a).

41. Use according to claim 37, characterized in that monomer (b) is acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid and/or maleic anhydride.

42. Use according to claim 37, characterized in that the polymer has the following composition:

(a)95.0 to 100.0% by weight of n-butyl acrylate, and

(b)0.0 to 5.0 wt% of acrylic acid.

43. Use according to claim 42, characterized in that the polymer has the following composition:

(a)95.0 to 99.5% by weight of n-butyl acrylate, and

(b) 0.5 to 5.0 wt% of acrylic acid.

44. Use according to claim 43, characterized in that the polymer has the following composition:

(a) 98.0 to 99.0% by weight of n-butyl acrylate, and

(b) 1.0 to 2.0 wt% of acrylic acid.

45. Use according to claim 37, characterized in that a tackifier and/or further additives may additionally be added to the pressure-sensitive adhesive in addition to any residual monomers that may be present.

46. Use according to claim 45, characterized in that up to 15 parts by weight of tackifier, based on the mass of the dried polymer dispersion, are added to the adhesive.

47. Use according to claim 46, characterized in that 5 to 15 parts by weight of tackifier, based on the mass of the dry polymer dispersion, are added to the adhesive.

48. Use according to claim 47, characterised in that 5 to 12 parts by weight of tackifier, based on the mass of the dry polymer dispersion, are added to the adhesive.

49. Use according to claim 48, characterized in that 6 to 10 parts by weight of tackifier, based on the mass of the dry polymer dispersion, are added to the adhesive.

50. Use according to claim 8, characterized in that the adhesive layer consists of an adhesive based on synthetic rubber, i.e. an adhesive consisting of at least one vinyl aromatic block copolymer and at least one tackifier resin.

51. Use according to claim 50, characterized in that the block copolymer is used in a concentration range of 30 to 70% by weight.

52. Use according to claim 51, characterized in that the block copolymer is used in a concentration range of 35 to 55% by weight.

53. Use according to claim 45, characterized in that as further additives light stabilizers, antiozonants, metal deactivators, processing aids, end-block reinforcing resins are used.

54. Use according to claim 53, characterized in that the light stabilizer is a sterically hindered amine.

55. Use according to claim 1, characterised in that a plurality of parallel strips of adhesive are coated on a carrier material.

56. Use according to claim 1, characterised in that more than one covering strip is applied to the adhesive coating.

57. Use according to claim 56, wherein the strips in total cover 50% to 80% of the area of the adhesive coating.

58. The use according to claim 56, wherein one or two strips of adhesive are retained, the total width of which represents 20 to 50% of the width of the carrier.

59. Use according to claim 55, characterised in that two strips of adhesive are present in the edge regions of the carrier, respectively, which extend in the machine direction.

60. Use according to claim 59, characterized in that the edges of the carrier or the outer edges of the adhesive strip are positioned edge to edge with respect to each other.

61. Use according to claim 55, characterized in that the sum of the widths of the adhesive strips is at most 50% of the width of the carrier, based on the width of the carrier in the transverse direction.

62. A cable bundle coated for use according to any one of claims 1 to 61.