Use of a thermally curable adhesive tape for wrapping elongated goods, especially cable harnesses

Abstract

Use of an adhesive tape for wrapping elongated material, such as, in particular, cables or cable harnesses, wherein the adhesive tape is guided in a helical line around the elongated material or the elongated material is wrapped in the axial direction by the adhesive tape, the elongated material together with the enclosing adhesive tape is brought into the desired arrangement, in particular into the cable harness plan, the elongated material is held in this arrangement, wherein the adhesive tape comprises a band-shaped carrier 31 which is provided on at least one side with an adhesive layer 32 consisting of a heat-activatable adhesive mass, wherein the heat-activatable adhesive mass is a latent-reactive adhesive film which is cured by the supply of thermal energy at a temperature between 60 °C and 110 °C, wherein the latently reactive adhesive film contains a thermoplastic component which has a melting temperature T(melt) of 35 °C ≤ T(melt) ≤ 90 °C and contains functional groups which can react with isocyanate, and an isocyanate-containing component which is present in particulate, in particular finely divided, dispersed in the thermoplastic component and is blocked, microencapsulated or deactivated in the region of the particle surface, wherein the particles have a light-off temperature T(light-off) of 40 °C ≤ T(light-off) ≤ 120 °C.

Description

The invention relates to the use of an adhesive tape for sheathing elongate material, in particular cable sets.For some time, adhesive tapes have been used in industry for producing cable harnesses. The adhesive tapes are used for bundling a multiplicity of electrical lines before installation or in an already mounted state, in order, for example, to reduce the space requirement of the line bundle by banding and additionally to achieve protective functions such as protection against mechanical and / or thermal stress. Common forms of adhesive tapes comprise film or textile supports which are generally coated on one side with pressure-sensitive adhesives. Adhesive tapes for enclosing elongate articles are known, for example, from EP 1 848 006 A2, DE 10 2013 213 726 A1 and EP 2 497 805 A1.Current tape wrapped cable sets are typically flexible. However, this is often undesirable for manufacturing reasons. During production, the cable strands are generally prefabricated to form a cable plan and then inserted into the object to be fitted, such as automobiles, for example. A cable harness plan corresponds to the actual spatial arrangement of the individual cable strands in the cable harness, that is to say which cable strand is bent at which point at which angle where positions of branches or bonds are located and with which plugs the ends of the cable strands are occupied.In order to keep the individual strands of the cable set in a specific shape, so that they can be guided around the engine, for example, in the engine compartment without coming into contact with the engine, injection molded parts are usually applied subsequently around the cable harness wound around with adhesive tape. However, these injection molded parts have the disadvantage that additional material and assembly effort is incurred.WO 2015 / 004190 A1 discloses a method for sheathing elongate material such as, in particular, lines or cable sets, in which the elongate material is sheathed in a helical line or in the axial direction with an adhesive tape having curable adhesive applied thereto, and the adhesive applied to the adhesive tape is cured by supplying radiation energy such as heat. For thermal curing, a temperature of 175° C. is used.A disadvantage of this method is the high curing temperature, which is not very practicable in the assembly of cable strands during the production process, for example in the automobile industry. Therefore, adhesive tapes are desirable whose adhesive compositions cure at at most 110° C., preferably at most 100° C., more preferably between 60° C. and 100° C., so that the covering of adhesive tapes can be integrated in the production processes of the cable harnesses or cable plans. On the other hand, the adhesives must not cure already during storage, since otherwise they can no longer be used.WO 2013 / 127 697 A1 discloses an adhesive tape for adhering anodized aluminum to plastic, comprising a) a tape-shaped textile carrier, for example a polyester nonwoven, b) which is provided on at least one side with an adhesive layer formed by a latently reactive adhesive film which contains a thermoplastic component which has a melting temperature T(melt) with 35° C.≤T(melt)≤90° C., in particular 40° C.≤T(melt)≤60 ° C., and contains functional groups which can react with isocyanate, and an isocyanate-containing component which is present in particulate form in the thermoplastic component and is substantially deactivated in the region of the particle surface, wherein the particles have a light-off temperature T(light-off) of 40° C.≤T(light-off)≤100 ° C., and wherein T(light-off)≥T(melt). The use of the adhesive tape for cable bandage is not described.DE 102 02 454 A1 discloses a method for sheathing elongate material, such as cable sets in particular, with two strip-shaped covers which enclose the material in a hose-like manner, so that the material is located substantially centrally between the covers.DE 43 34 039 A1 relates to an adhesive tape consisting of a flexible tape-shaped carrier and a coating having self-adhesive properties, wherein a material component curable by heating is added to the carrier and / or the coating in such a way that the adhesive tape has dimensionally stable properties after curing. This adhesive tape is thus suitable in particular for wrapping initially flexible cable sets, such as cable harnesses and the like, which can then be made dimensionally stable by heating.It is therefore an object of the present invention to provide an adhesive tape for coating elongate material which meets the requirements described above.To solve the technical problems, the use of an adhesive tape for covering elongate material is proposed, comprising a tape-shaped carrier which is provided on at least one side with an adhesive layer which consists of a heat-activatable adhesive, the heat-activatable adhesive being a latent-reactive adhesive film which is cured by the supply of thermal energy at a temperature between 60° C. and 110° C.Heat-activatable adhesives can be differentiated into two categories: a) thermoplastic heat-activatable adhesives ("hotmelt adhesives") b) reactive heat-activatable adhesives ("reactive adhesives")Thermoplastic heat-activatable adhesives ("hotmelt adhesives") are usually non- or weakly self-adhesive at room temperature. The adhesive is activated only with the heat, melts, becomes flowable and flexible, so that the sheathing of the elongate material is possible without problems. This is due to a correspondingly high glass transition temperature of the adhesive, so that the activation temperature is above room temperature in order to achieve sufficient tackiness. At the elevated temperatures, an adhesive effect occurs already before the setting of the composition because of the self-adhesive properties. After the joining together, these adhesives bond physically (generally reversibly; thermoplastic materials), optionally additionally chemically (generally irreversibly; thermoplastic-reactive materials), during cooling with solidification, so that the adhesive effect is retained even in the cooled state and develops its ultimate strength there. The more heat, pressure and time, the stronger the bond of the ribbon-shaped layers as a rule. This can regularly realize maximum bond strengths and light processing conditions. Thermoplastics are understood to mean those compounds as defined in Rompp (online version; Edition 2016, document identifier RD-20-01271).Reactive heat-activatable adhesives ("reactive adhesives") are polymer systems which have functional groups in such a way that, when heat is supplied, a chemical reaction takes place, the adhesive chemically sets and thus gives rise to the adhesive effect. Reactive heat-activatable adhesives do not generally become self-tacky when heat is supplied, so that the adhesive effect only occurs after setting. Reactive heat-activatable adhesives are generally not thermoplastic. The glass transition temperature is not important for the functionality of reactive systems. It may likewise be advantageous to configure the reactive compounds in such a way that they become softer and / or more flowable at elevated temperature in order to adapt optimally to the adhesive bond.In a particularly advantageous procedure according to the invention, heat-activatedly adhesiveable adhesives used are those whose activation temperature is low. As a result, it is possible to also stiffen heat-sensitive materials without these being damaged. Since, in addition, no external pressure has to be exerted, a particularly material-preserving stiffening is possible by the method thus configured.As heat-activatedly adhesive-and for the invention shown in the present specification for the layer of the heat-activatedly adhesive-adhesive having a relatively low activation temperature-adhesive compositions with excellent suitability-it is advantageously possible to use latent adhesives as described, for example, in WO 2013 / 127697 A. In the context of the heat-activatedly adhesive-composition layers, these are, in particular, latently reactive adhesive films which comprise: a) a thermoplastic component having a melting temperature Tmeltzin the range of 35° C.≤Tmeltz≤90° C., in particular 40° C.≤Tmeltz≤60 ° C., the thermoplastic component having functional groups which can react with isocyanate, and b) an isocyanate-containing component which is present in dispersed form in the thermoplastic component in a particulate form and is substantially deactivated in the region of the particle surface, the particles having a light-off temperature T Anspring of 40° C.≤Tmeltz≤100 ° C., in particular 45° C.≤Tmeltz≤75 ° C., where T is Anspring ≥ T'schmelz.For purposes of this specification, Tmeltis the melting temperature of the thermoplastic component and T Anspring is the temperature at which the isocyanate groups of the particles dispersed into the thermoplastic component are rendered capable of reacting with the functional groups of the thermoplastic polyurethane (for example because they are distributed in the matrix with the thermoplastic polyurethane). In the case of blocked isocyanate groups, T Anspring is linked to the deblocking temperature, in the case of microencapsulation to release isocyanate from the microcapsules (for example by melting the microcapsule shell) and in the case of isocyanates deactivated in the region of the surface of the isocyanate particles to melt the isocyanate particles. For the purposes of this invention, all blocked, microencapsulated systems known from the prior art or isocyanate-containing systems deactivated in the region of the particle surface are conceivable, which meet the specifications for T Anspring. The thermoplastic polyurethanes and the isocyanate-containing component are preferably dispersible in an aqueous medium or dispersed in an aqueous medium.The latently reactive adhesive films contain a thermoplastic component which has a melting temperature, Tmelt, and contains functional groups which can react with isocyanate, and an isocyanate-containing component which is present in dispersed form, in particular in particulate form, in the thermoplastic component and is blocked, microencapsulated or substantially deactivated in the region of the particle surface. Finely divided particulate means here having a particle size distribution of d 50< 50 μm, the particle size distribution preferably being <15 μm. Latent-reactive adhesive films are preferably based on so-called 1K latent-reactive polyurethane obtained from aqueous polyurethane dispersion, preferably Dispercoll U ® from Covestro AG; the isocyanate-containing component here is one which is substantially deactivated in the region of the particle surface.The particles have a light-off temperature, T Anspring, for which TSchmelz≤T Anspring. TSchmelzis between 35° C. and 90° C., preferably between 40° C. and 60° C. T Anspring is between 40° C. and 120° C., preferably at most 100° C., very particularly preferably at most 90° C. As a lower limit, 50° C. is preferred and 60° C. is particularly preferred.Particularly preferred is Tmelt<T Anspring, since this makes it possible to reliably prevent unwanted initiation of the crosslinking reaction during the production of the sheet-like latently reactive adhesive film.The thermoplastic component used is preferably those compounds functionalized with OH and / or NH 2- groups. The thermoplastic component is very preferably at least one semicrystalline polyester polyurethane.The latently reactive adhesive film preferably comprises an anionic, high molecular weight polyurethane dispersion as thermoplastic component, which has a melting temperature (in dried form) Tsecmelzwith 35° C.≤Tchmelz≤90° C., in particular 40° C.≤Tchmelz≤60 ° C., and contains functional groups which can react with isocyanate, for example in the form of commercially available products from the abovementioned Dispercoll U family such as Dispercoll U53, Dispercoll U54, Dispercoll U56, Dispercoll U 8755, Dispercoll U XP 2815, Dispercoll VP KA 8758, Dispercoll U XP 2682, Dispercoll U 2824 XP, Dispercoll U XP 2701, Dispercoll U XP 2702, Dispercoll U XP 2710 and / or Dispercoll BL XP 2578 (Dispercoll is a registered trademark of Bayer AG).The latently reactive adhesive film in this case additionally preferably comprises toluylene diisocyanate compounds (TDI compounds) such as Dispercoll BL XP 2514 (TDI dimer) and / or Aqualink U (dispersion of blocked TDI dimer) and / or isophorone diisocyanates (IPDI) such as Aqualink D (dispersion of blocked IPDI trimer) as isocyanate-containing component, which is present dispersed in the thermoplastic component in particulate form, in particular in particulate form, and is blocked, microencapsulated or substantially deactivated in the region of the particle surface. The diisocyanates are used, for example, in the form of the aqueous suspensions of the respective latent-reactive solid isocyanate. Aqualink is offered by Aquaspersion. In particular in combination with anionic, high molecular weight polyurethane dispersions as thermoplastic component (such as the stated Dispercoll U products), the abovementioned diisocyanate products can be used as crosslinking component. Other isocyanates, including monomeric and oligomeric compounds and polyisocyanates, can be used.The latently reactive adhesive film may further contain further formulation ingredients. These include thickeners, wetting agents, defoamers, fillers (for example thermally conductive), pigments (comprising agents for coloring, adjusting whiteness and / or blackened), catalysts, stabilizers, antioxidants, light stabilizers and further polymers for adjusting specific adhesive properties. Specific adhesive properties can be established, for example, by admixing aqueous dispersions of amorphous polymers (for example polyether urethanes or polyacrylates) and / or by admixing aqueous resin dispersions (in particular based on rosin esters) or liquid resins.According to the invention, a latently reactive adhesive film with at least one layer of a latently reactive adhesive formulation is preferably used with a layer thickness of between at least 10 μm and at most 500 μm, preferably between at least 20 μm and at most 250 μm.According to one embodiment, the heat-activatable adhesive film is brought into bond with a web-shaped carrier under pressure at moderate temperatures, preferably <T Anspring.The supports used may be all known films and textile supports such as knits, laid scrims, belts, braids, needled pile textiles, felts, woven fabrics (comprising canvas, twill and atlas weave), knitted fabrics (comprising warp knit and knit) or nonwovens, where "nonwoven" is to be understood as meaning at least textile planar structures according to EN 29092 (1988), and stitch-bonded nonwovens and similar systems. Particularly advantageous is an adhesive tape in which a woven fabric, a nonwoven fabric or a knitted fabric is used as the carrier. Such supports are described, for example, in WO 2015 / 004190 A1, which is fully incorporated herein by reference.Furthermore, spacer fabrics and knitted fabrics with lamination can be used. Spacer fabrics of this type are disclosed in EP 0 071 212 B1. Spacer fabrics are mat-shaped layered bodies with a cover layer made of a fiber or filament fleece, a backing layer and individual or tufts of holding fibers present between these layers, which are needled through the particle layer distributed over the surface of the layered body and connect the cover layer and the backing layer to each other.Suitable nonwovens are particularly consolidated staple fiber nonwovens, but also filament, meltblown and spunbonded nonwovens, which are usually additionally to be consolidated. Mechanical, thermal and chemical consolidation are known as possible consolidation methods for nonwovens. Nonwovens have proven to be particularly advantageous which are consolidated in particular by oversewing with separate threads or by mesh. Such consolidated nonwovens are produced, for example, on stitch-bonded machines of the "Malimo" type from Karl Mayer, formerly Malimo, and can be obtained, inter alia, from Hoptex Group AG.As the support, a kunit or multiknit nonwoven fabric can be further used. A spun-knit nonwoven fabric is characterized in that it results from the processing of a longitudinally oriented nonwoven fabric into a planar structure which has stitches on one side and stitches on the other, but has neither threads nor prefabricated planar structures. Such a nonwoven is also produced for a long time, for example on stitch-bonded machines of the "Malimo" type from Karl Mayer.A multiknit nonwoven is characterized in comparison with the kunit nonwoven in that the nonwoven experiences consolidation by puncturing on both sides with needles both on the top side and on the bottom side. As a starting product for a multiknit, one or two unidirectionally meshed nonwoven pile fabrics produced by the Kunit process are generally used. In the end product, both nonwoven fabric top sides are formed into a closed surface by fiber mesh and are connected to one another by virtually perpendicular fibers. The additional introducible of further pierceable sheet materials and / or spreadable media is provided.Finally, stitch-bonded webs are also suitable as a precursor for forming the backing and the adhesive tape. A stitched nonwoven is formed from a nonwoven material having a plurality of seams running parallel to one another. These seams are formed by sewing in or stitch-knitting continuous textile threads. For this type of nonwoven, stitch-bonded machines of the "Malimido" type are known from Karl Mayer.Needle-punched fleeces are also particularly suitable. In needle punch fleece, a fibrous web becomes a sheet structure with the aid of barbed needles. By alternating puncturing and pulling out of the needles, the material is consolidated on a needle bar, whereby the individual fibers become entangled to form a solid sheet structure.Furthermore, a staple fiber fleece which is preconsolidated in the first step by mechanical processing or which is a wet fleece which has been laid hydrodynamically, wherein between 2 wt. % and 50 wt. % of the fibers of the fleece are fusible fibers, in particular between 5 wt. % and 40 wt. % of the fibers of the fleece. Such a nonwoven is characterized in that the fibers are wet laid or, for example, a staple fiber nonwoven is preconsolidated by forming meshes of fibers of the nonwoven by needle punching, sewing, air and / or water jet processing. In a second step, heat setting takes place, the strength of the nonwoven being increased again by the melting or fusing of the fusible fibers.Advantageously and at least in regions, the carrier has a smooth-ground surface on one or both sides, preferably a smooth-ground surface over the entire surface. The smooth-ground surface may be machined, as explained, for example, in EP 1 448 744 A1. In this way, the repellency of dirt is improved.As starting materials for the support, in particular (chemical) fibers (staple fiber or continuous filament) made of synthetic polymers, also called synthetic fibers, made of polyester such as polyethylene terephthalate, polyamide, polyimide, aramid, polyolefin, polyacrylonitrile or glass, (chemical) fibers made of natural polymers such as cellulosic fibers (viscose, modal, lyocell, cupro, acetate, triacetate, cellulon), such as rubber fibers, such as vegetable egg white fibers and / or such as animal egg white fibers and / or natural fibers made of cotton, sisal, flax, silk, hemp, linen, coconut or wool are provided. However, the present invention is not limited to the materials mentioned, but rather, it is possible, as recognized by the person skilled in the art without having to be carried out according to the present invention, to use a large number of further fibers for producing the nonwoven.Furthermore, yarns made from the indicated raw materials are also suitable. In fabrics or laid scrims, individual filaments can be made from a mixed yarn, i.e., they can have synthetic and natural constituents. As a rule, however, the warp threads and the weft threads are each embodied in a single type.Polyester is preferably used as the material for the carrier, because of the excellent ageing resistance and the excellent media resistance to chemicals and operating agents such as oil, gasoline, antifreeze and the like. Furthermore, polyester has the advantage that it leads to a very abrasion-resistant and temperature-resistant carrier, which is of particular importance for the specific application for bundling cables in automobiles and, for example, in the engine compartment.Advantageously, the basis weight of the textile carrier is between 30 g / m 2 and 300 g / m 2 further advantageously between 50 g / m 2 and 200 g / m 2, particularly advantageously between 50 g / m 2 and 150 g / m 2, very particularly advantageously between 50 g / m 2 and 100 g / m 2.According to a particularly advantageous embodiment of the invention, a woven or nonwoven fabric made of polyester is used as the carrier, which woven or nonwoven fabric has a weight per unit area of between 50 g / m 2 and 150 g / m 2.The adhesive composition may be elastic after curing, in order to ensure a durable sheathing which is insensitive to oscillations and distortions.The finished coated material is preferably cut to a width of 20±2 mm (any other width is also conceivable) and wound spirally with an overlap of 50% around the shaped cable bundle. For the activation of the latent reactive adhesive film, a temperature application of 110° C. for 10 min is preferably necessary. The temperature can be applied by hot air blow, IR radiator, oven, heating sleeve or the like.According to a preferred embodiment of the invention, the adhesive composition, after application to the backing, has penetrated into the backing to an extent of more than 5%, preferably more than 10%, more preferably more than 25%, more preferably more than 50%. A numerical value of 25% for example means that the adhesive has penetrated over a layer thickness of 25% of the thickness of the textile carrier, i.e. in the case of a carrier having a thickness of 100 μm over a layer thickness of 25 μm within the carrier, namely starting from the surface of the carrier on which the adhesive is coated and in the perpendicular direction to the plane spanned by the longitudinal or transverse direction.More preferably, the carrier can be fully penetrated by the adhesive, i.e. the adhesive can have penetrated 100% of the carrier, particularly advantageously to a maximum of 90, particularly advantageously to a maximum of 75%, and even more particularly advantageously to a maximum of 50%.Accordingly, an advantageous embodiment of the invention represents a variant of the adhesive tape in which the adhesive has sunk into the backing between 10% and 75%, more preferably between 25% and 50%.In a preferred embodiment, the amount of coated adhesive is selected such that a good portion of the partially-hollow adhesive layer still projects beyond the backing. The thickness of the non-essential adhesive layer is preferably more than 25 μm, more preferably more than 50 μm, more preferably more than 100 μm.The ready-coated material is preferably provided with a protective film.The present invention relates to the use of the adhesive tape for sheathing elongate material such as, in particular, lines or cable sets, wherein the adhesive tape is guided in a helical line around the elongate material or the elongate material is sheathed in the axial direction by the adhesive tape, the elongate material together with the sheathing adhesive tape is brought into the desired arrangement, in particular into the cable set plan, the elongate material is held in this arrangement, the curable adhesive is cured by the supply of heat at a temperature between 60° C. and 110° C. Preferably, the thermal energy is supplied over a period of 0.5 sec to 15 min, further preferably of 5 sec to 11 min, further preferably 1 min to 6 min, which is compatible with the cycle times of the manufacturing process, so that the elongate material is completely cured as soon as it is installed in the target object such as automobiles, watercraft or aircraft.FIG. 2 shows a cross-sectional view (cross section) of the adhesive tape which consists of a nonwoven backing 31 to which a layer of a curable adhesive 32 is applied on one side, which is additionally self-adhesive.The adhesive has penetrated 25% into the carrier (33), which brings about optimum anchoring.The invention also includes a sheathed elongate material, such as in particular a cable set, sheathed with the adhesive tape, and a vehicle comprising such a sheathed elongate material.Examples:Example 1 - Preparation of an Adhesive TapeA latently reactive adhesive film was prepared from 100 parts of Dispercoll® U53 (Bayer AG), 10 parts of Dispercoll® BL XP2514 (Bayer AG) and 1.5 parts of Borchi® Gel0625 (OMG Borchers). The formulation ingredients were mixed as an aqueous dispersion in a barrel with an anchor stirrer at 60 l / min at room temperature for 15 min. The solids content was adjusted to 46% by weight by addition of demineralized water.A web coating plant was used to produce a coating on various temporary supports by means of a doctor blade. The water was then freed in a drying channel at 40° C. for 15 min. Resulting bales were cut into rolls 50 mm wide and 100 m long. The samples had a layer thickness of the latent reactive adhesive film of 100 μm. The maximum elongation of the free film (i.e. without temporary support) was 1134% and the tear strength was 34 MPa. In order to ensure handling on the cable set, the adhesive film requires a carrier. For this purpose, the cut bale material is brought into bond at moderate temperatures of 40° C. with the aid of a laminator with a 220 μm PET fabric carrier.Example 2 - Bending Test for Determining StiffnessA test pattern consisting of 250 individual lines having a line cross section of 0.35 mm 2, was bundled to a pattern line set using a 9 mm wide adhesive tape (tesa 51618), so that the pattern line set had a diameter of 23±5 mm and a length of 300±50 mm. This pattern line set was spirally wound with the stiffening material, ensuring 50% overlap. Subsequently, the stiffening material was hardened by means of heat.The cured pattern lead set was subjected to a bending test to determine the effect of the stiffening material on stiffness. The bending test was carried out on a tensile testing machine. For this purpose, the pattern line set was placed on two jaws at a distance of 70 mm and pressed and loaded centrally with a pressure fin around a distance of 30 mm. The force required for the deformation of the measurement path was recorded in Newton by a tensile testing machine. The test speed was 100 mm / min both at the load and at the load relief of the pattern line set. The test was performed at 3 different locations of the line set. The bending force results from the average of the three individual measurements and was evaluated in three categories. For comparison, a commercially available adhesive tape, tesa ®51036, was subjected to the same experiment. The results are shown in Table 1 below.Evaluation categories 3-point Bending Test:+ Well suited for application (500 to 700 N) O restrictedly suited for application (400 to 500 N and 700 to 800 N) - not suited for application (<400 N and >800 N)For comparison, a commercially available adhesive tape, tesa ®51036, was subjected to the same experiment. The results are shown in Table 1 below.Example 3 - C-Shape Test for Determining Stiffness at Different TemperaturesA test method was developed for determining the rigidity of a bent cable pattern (C cable pattern bending test). To produce a C-cable pattern, a cable line with a line cross section of 0.35 mm is wound 100 times 2 to a pattern line set around a holder which has two opposing semicircular guides (winding mandrels) with a diameter of 120 mm, which are spaced apart by a distance of approximately 210 mm. The number of cable windings is 100. A pattern line set with a diameter of 15±5 mm and a circumference of 690 mm is produced. At the vertices of the semicircular segments and at two straight line sections (legs) in each case, the cable bundle is tied together and fixed with cable ties with a tensile force of 210±10 N, so that, after removal from the holder, it has sufficient rigidity to not deform. In order to further improve the rigidity of the cable bundle, a support is positioned between the legs of the cable bundle and is likewise fixed by cable ties. The cable bundle produced in this way is wound around with the adhesive tape to be tested (width 19 mm-20 mm) with a 50% overlap. For this purpose, the winding is started on a cable tie of the leg in the direction of the segment of a circle. When the winding reaches the cable tie at the apex of the semi-circular segment, it is removed and the winding is continued until the next cable tie of the opposite leg. The same procedure is also carried out on the other side, on the other semicircular segment. The samples thus prepared are subjected to the corresponding crosslinking method (thermal energy, 110° C.). With a side cutter, the patterns adjacent to the remaining cable ties are cut to obtain two "C-shaped" cable (C-cable) patterns each having an un-wrapped portion on both sides of the semi-circular wrapped portion. Loops are tied to the leg ends of the patterns with a length of cable to allow it to be suspended at one end and a weight to be suspended at the other end. The remaining cable ties are now removed, since they can distort the test result. The distance between the legs is now determined.One of the two samples is stored at room temperature and the other at 60° C.A 1 kg weight is suspended on the respective lower leg of the "C-test piece". After one hour, the deflection of the cable bundle is noted (deflection behavior at RT or 60° C. for 1 h) and the weight is removed. After one minute, the deflection is determined again (recovery behavior at RT or 60° C. for 1 min). After one hour, the deflection is then determined again and recorded (restoring behavior at RT or 60° C. for 1 h).The determined C-shape deformation values were classified into three categories, well suited for application, limitedly suited for application, and not suitable for application. For comparison, a commercially available adhesive tape, tesa ®51036, was subjected to the same experiment. The results are also shown in Table 1 below.Evaluation categories of C-shape bending test (room temperature and 60° C.):+ well suited for application (<15% deflection) O restrictedly suited for application (>15 to 30%) - not suited for application (>30%)Evaluation categories of C-shape bending test (recovery at RT and 60° C.)+ well suited for application (<10% deflection) O restrictedly suited for application (10 to 30%) - not suited for application (>30%)For comparison, a commercially available adhesive tape, tesa ®51036, a PET woven tape with an acrylate adhesive composition, was subjected to the same experiment. The results are also shown in Table 1 below. Table 1: Table 1:Example 1++-tesa® 51036---Legend:+ well suited for application ◯ restrictedly suited for application - not suited for applicationList of reference characters3 Semicircular guide 4, 5, 6, 7, 8, 9 cable tie 10 cable bundle 11 support 31 nonwoven carrier 32 layer of a curable adhesive 33 sink region

Claims

Use of an adhesive tape for sheathing elongate material such as, in particular, lines or cable sets, wherein the adhesive tape is guided around the elongate material in a helical line or the elongate material is sheathed in the axial direction by the adhesive tape, the elongate material together with the sheathing adhesive tape is brought into the desired arrangement, in particular into the cable set plan, the elongate material is held in this arrangement, wherein the adhesive tape comprises a tape-shaped carrier 31 which is provided on at least one side with an adhesive layer 32 which consists of a heat-activatable adhesive, wherein the heat-activatable adhesive is a latent-reactive adhesive film which is cured by the supply of thermal energy at a temperature between 60°C and 110°C, wherein the latent-reactive adhesive film is a thermoplastic component, which has a melting temperature T(melt) at 35° C.≤T(melt)≤90° C. and contains functional groups which can react with isocyanate and an isocyanate-containing component which is present in dispersed form, in particular in fine particles, in the thermoplastic component and is blocked, microencapsulated or deactivated in the region of the particle surface, wherein the particles have a light-off temperature T(light-off) of 40° C.≤T(light-off)≤120 ° C.Use according to Claim 1, characterized in that the adhesive film is coated from aqueous dispersion and is not pressure-sensitively adhesive at room temperature.Use according to one of the preceding claims, characterized in that the carrier material 31 comprises a polyester nonwoven.Use according to one of the preceding claims, characterized in that more than 10% of the adhesive 32 has sunk into the backing.Use according to claim 1, characterised in that the thermal energy is supplied over a period of 0.5 sec to 15 min, preferably of 5 sec to 11 min, more preferably 1 min to 6 min.Sheathed elongate material, such as in particular a cable set, obtained according to at least one of the preceding claims.Vehicle containing sheathed elongate material according to Claim 6.

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