Method and apparatus for producing adhesive tapes

Abstract

The invention relates to a method for producing an adhesive tape (1), in particular a wrapping tape for binding cables in automobiles. For this purpose, a textile carrier strip (3), optionally having an adhesive coating (5), is fed from an unwinding roller (4) in the longitudinal direction (L) and is cut into longitudinal strips by means of a longitudinal cutting device (8). The longitudinal cutting device (8) has at least one hobbing cutter (8a). In addition, a heatable sealing device (6) is provided, by means of which the cut edge of the adhesive tape (1) is sealed. According to the invention, the sealing device (6) acts spatially and temporally prior to the longitudinal cutting device (8) and defines a sealing path (9) in the carrier strip (3), which sealing path is cut by a subsequent hobbing cutter (8a).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing adhesive tape, particularly for wrapping cables in automobiles, wherein a textile carrier tape optionally having an adhesive coating is supplied from an unwinding roller in the longitudinal direction and the textile carrier tape is cut into longitudinal strips by means of a longitudinal cutting device, wherein the longitudinal cutting device has at least one roller cutter and is additionally provided with a heatable sealing device by means of which the cut edges of the tape are sealed. Background Technology

[0002] Textile carrier strips are typically cut into longitudinal strips for the manufacture of adhesive tapes. The individual tapes are then wound onto spools for mass production. In this case, the textile carrier strips may have an adhesive coating on one or both sides before being longitudinally cut. Alternatively, the uncoated textile carrier strips can be longitudinally cut first, and then the individual longitudinal strips can be coated with adhesive.

[0003] This basic operating method is described, for example, in DE 10 2020 119 494 A1, derived from the applicant. In this method, the carrier strip and / or longitudinal strip also pass through at least one storage container. The operating method described herein has proven effective in principle.

[0004] However, when longitudinal cutting is performed using a longitudinal cutting device to form longitudinal strips from textile carrier material, problems may arise if the cut edges of the tape manufactured in this way are observed. In fact, the problem with the cut edges is the presence of what is known as loose threads. Furthermore, for example, when processing a sewn nonwoven carrier in the described manner, fuzzing or piling may occur. Of course, this loose threading, piling, or fuzzing phenomenon typically does not occur on non-woven carrier materials, such as when using plastic film.

[0005] For this reason, prior art of the same type and starting point as DE 10 2023 105 349 A1 is operated such that, in addition to the rotary cutter which is part of the longitudinal cutting device, a heatable sealing device is additionally provided. This sealing device allows for the subsequent sealing of the cut edges of the tape made using the rotary cutter.

[0006] This describes in detail how, after cutting, the corresponding cut edges of the tape are heated to the point that the fibers and / or filaments used to make the textile at least partially melt using a sealing tool. This creates a connection point between the fibers and / or filaments. The sealing tool is a comb-like device in which each heated tooth sinks into the space between corresponding longitudinal strips. The carrier tape, thus divided into longitudinal strips, passes beside the heated teeth of the comb-like sealing tool with its previously generated cut edges, achieving the aforementioned seal on the cut edges.

[0007] While the described method generally ensures a seal on the resulting cut edges, it is technically and manufacturingly expensive and inflexible. In fact, the fixed spacing of the comb-like teeth prevents the handling of different widths of textile carrier materials and tapes produced in this manner. Instead, each desired tape width ultimately requires a separate, specially designed sealing tool.

[0008] Furthermore, sealing occurs both temporally and spatially after the longitudinal cutting. Therefore, guiding the previously produced longitudinal strips or tapes and their cut edges places significantly higher demands on the sealing tool. That is, the longitudinal strips, previously produced separately by a rotary cutter, must be guided precisely into the gaps between the teeth and guided along the teeth by their cut edges. This requires specialized strip guiding devices, which, like the sealing tool itself, involve significant technical investment and are therefore costly and inflexible. This invention addresses this issue. Summary of the Invention

[0009] The technical objective of this invention is to improve such methods for manufacturing adhesive tapes in a way that reduces technical input and lowers production costs. Furthermore, it should provide flexible production of adhesive tapes with different widths. Similarly, it should provide equipment suitable for performing the methods.

[0010] To address this technical task, the present invention is proposed based on a similar method for manufacturing tapes, wherein the sealing device acts spatially and temporally prior to the action of the roller cutter and defines a sealing trajectory in the carrier tape, the sealing trajectory being cut by a subsequent roller cutter.

[0011] According to the present invention and unlike the prior art of the same type according to DE 10 2023 105 349 A1, the operation is firstly such that the sealing device moves spatially and temporally before the rolling cutter, whereas in known teachings, the sealing device lags behind the rolling cutter spatially and temporally. This spatial and temporal lag results in the aforementioned disadvantages, namely, primarily increased technical input and insufficient flexibility. The present invention overcomes both of these disadvantages.

[0012] Because the sealing device precedes the action of the rotary cutter in both space and time, no post-cut sealing of the cut edge occurs. Instead, the sealing can be said to occur beforehand, more precisely, before the cut edge is introduced into the textile carrier strip. This is achieved by means of a sealing track within the carrier strip.

[0013] In practice, this is done by having the sealing device ensure the formation of a sealing track within the carrier strip. In this case, the sealing device ensures that the carrier strip is heated in the area where the sealing track is to be formed to the point that the fibers and / or filaments forming the textile are at least partially melted. This forms the connection point and thus the area of ​​the carrier strip that can be described as hardened, i.e., the sealing track. This sealing track now extends along the longitudinal direction of the carrier strip, more precisely, in the area where the carrier strip is subsequently cut by a subsequent rotary cutter in both space and time. The longitudinal transport of the carrier strip ensures this, while the cutting device and sealing device remain in a fixed position relative to it.

[0014] For this reason, sealing tracks are introduced parallel to each other and in the longitudinal direction along the carrier strip, in a number equal to the number of subsequently formed cutting edges, so as to enable the production of longitudinal strips and thus tapes in this manner. For this purpose, the corresponding sealing tracks have a track width that, on the one hand, allows for defect-free cutting in the hardened region of the carrier strip using a rotary cutter, and on the other hand, ensures that the longitudinal strips formed in this manner are sealed at the cutting edges after cutting, since, according to the invention, the cutting edges are created by typically cutting the sealing tracks in the middle.

[0015] This is generally done so that the rotary cutter cuts the relevant sealing trajectory in a compressive cutting sense. For this purpose, a conventional rotary cutter can be used, such as the rotary cutter already described in principle in DE 103 05 874 A1.

[0016] In practice, this typically involves using separately driven rotating blades that cut the sealing track essentially in the middle with the aid of a front-mounted blade, which is mostly triangular in cross-section. For this purpose, the textile carrier strip is usually guided by a counter-rotating pressure roller, which may, for example, have a rubber coating, but this coating is usually omitted.

[0017] In this process, it is typically done such that a sealing track is formed on the back of the textile carrier strip with its adhesive-free coating, and then the sealing track is cut substantially in the middle using an associated rotary cutter. For this purpose, the sealing track has a predetermined width, which is typically 1 mm or greater. It is also conceivable that a smaller width of less than 1 mm is acceptable, as long as the required longitudinal cut can be subsequently introduced into the sealing track and the resulting longitudinal edges remain sealed.

[0018] Typically, the width of the sealing track seen here is, for example, 1 mm to 3 mm and greater. The width of the sealing track can also be set to 3 mm to 5 mm and greater. Furthermore, the design is such that at least 50% by weight of the textile carrier strip is made of plastic. Specifically, this can be achieved and implemented as follows: the textile carrier strip is, in principle, made of a laminate, for example, composed of a fabric or nonwoven fabric and a plastic coating. It is typically designed such that the back side of the textile carrier strip with the sealing track in this case is formed of fabric or nonwoven fabric, while the plastic coating faces inward and has an adhesive coating from the beginning or subsequently.

[0019] When introducing a sealing track into a fabric or nonwoven material, the underlying plastic coating primarily ensures hardening in the sealing track area, as this is mainly due to the melting of the plastic in the coating, forming the desired hardened area and thus creating the sealing track. All of this is arguably automated, as the sealing device and the rotary cutter are typically positioned in a fixed position and guided against the textile carrier strip in the longitudinal direction.

[0020] However, within the scope of this invention, laminates consisting of, for example, a fabric carrier and a plastic coating are generally not used as textile carrier strips, although this is possible in principle. Instead, according to the invention, the textile carrier strip is characterized by typically having at least one or more textile layers. To achieve and implement the meltability required for forming the sealing track in this case, it is designed such that the relevant textile carrier strip in this case consists of at least 50% by weight of plastic fibers and / or plastic filaments. The sealing device now ensures that the relevant plastic fibers and / or plastic filaments in the carrier strip are heated to such an extent that they melt at least in the sealing track region and form the previously mentioned connection points between the plastic fibers and / or plastic filaments.

[0021] This results in the plastic fibers and / or plastic filaments fusing together in a sealed trajectory, at least up to a portion of the thickness of the carrier strip relative to its total thickness. This portion of thickness is at least 20% and, more particularly, at least 50% of the total thickness of the textile carrier strip.

[0022] In other words, the sealing device ensures that the plastic fibers and / or plastic filaments are at least partially melted in the sealing track area. This forms the aforementioned connection point and therefore the hardened area of ​​the carrier strip. This hardened area not only has a defined width of the sealing track created in this way, but also covers a track depth corresponding to a portion of the thickness of the textile carrier strip relative to its total thickness. Within this track depth area, the plastic fibers and / or plastic filaments are fused together. The track depth, and the associated portion of the carrier strip thickness relative to its total thickness, is hereby at least 20% and greater, and typically 50% and greater of the total thickness.

[0023] In other words, according to the present invention, it is conceivable in principle that the sealing trajectory and the hardened area formed therefrom do not completely cover the total thickness of the carrier strip relative to the total thickness of the carrier strip, but only cover the mentioned trajectory depth, i.e., mostly 20% or more of the total thickness. Thus, on the one hand, it can still be ensured that the carrier strip is cut neatly within the sealing trajectory area, and on the other hand, the cut edge produced in this way will not have frayed, fuzzy, or fibrous appearance.

[0024] However, this operation typically results in the hardening of the carrier strip due to the sealing track's width, which is set by the sealing device, and its depth, which substantially corresponds to the total thickness of the carrier strip. In this case, the seal in the sealing track covers the total thickness of the carrier strip. This ensures that the subsequent cut edges produced by the associated rotary cutter are also free of any fraying, streaking, or other defects across the entire width. This is a major advantage of the present invention.

[0025] According to another advantageous design, the sealing device and the cutting blade can form a single functional unit. Advantageously, the sealing device and the cutting blade are connected, for example, to a common retaining device. This ensures their mutual alignment from the outset and eliminates the need for additional alignment measures.

[0026] In effect, this ensures that the sealing device, which actuates first, forms a sealing trajectory in the longitudinal direction, and then the rotary cutter essentially cuts through the sealing trajectory in the middle, where the width of the sealing trajectory, or the trajectory width, simultaneously reveals a sealed cutting edge. Therefore, no loose lines, threads, or fibers are formed in the cutting edge area.

[0027] However, it is also possible to operate in such a way that the sealing device and the rotary cutter are functionally separate. In this case, it is possible to first treat the textile carrier strip with the sealing device and introduce the one or more sealing tracks. This is typically done on the back side of the carrier strip, i.e., the side facing away from the adhesive coating. If the adhesive coating has not yet been applied, sealing tracks can of course be provided for the textile carrier strip from both sides.

[0028] Regardless, in this case where the sealing device and the rotary cutter function are separated, a sealing track is first introduced into the textile carrier strip, which is then wound up. In a subsequent step, both temporally and spatially, the textile carrier strip with the one or more introduced sealing tracks can be cut longitudinally. For this purpose, the textile carrier strip with the associated sealing tracks is unwound and fed to the one or more rotary cutters. In this case, it is additionally specified that the rotary cutter is aligned relative to the sealing track by means of a sensor device, or vice versa. The sensor device thus ensures, on the one hand, that the rotary cutter "touches" the sealing track, and on the other hand, that the sealing track is actually cut in the middle by means of the rotary cutter.

[0029] For this purpose, the sensor device can scan the sealing trajectory. This can be achieved, for example, optically using a camera and through image comparison. Other scanning possibilities are also conceivable, such as tactile scanning, where a probe moves across the carrier strip and detects the sealing trajectory as a particularly "smooth" area. Furthermore, within the scope of the invention, the sensor device can also be implemented and carried out when the sealing device and the rolling cutter form the functional unit.

[0030] As already explained, the textile carrier strip is at least substantially made of plastic fibers and / or plastic filaments or plastic yarns. In fact, at least 50% by weight of plastic is used in the textile carrier strip here. Furthermore, there is the possibility that, in addition to plastic fibers and / or plastic filaments, natural fibers may also be used, for example. That is, textile carrier strips composed of both natural and plastic fibers can, in principle, be processed and cut using the method of operation according to the invention, provided that the plastic fibers are dominant in the example, i.e., accounting for 50% or more of the textile carrier strip's mass.

[0031] The sealing device operates in principle in two ways to introduce a sealing trajectory into the carrier strip. In practice, it is conceivable that the sealing device can generate a sealing trajectory in either a non-contact or contact manner. The sealing device as a whole can be heated to a temperature higher than the melting point of the carrier strip, and especially higher than the melting point of the plastic used. A sealing trajectory is then generated by contact between the sealing device and the carrier strip. In this variation, the sealing device can, in a very simple case, be a heating strip or a heated roller. This roller can here be similar to a rotary cutter rolling or being driven on the carrier strip traveling in the longitudinal direction. Since the sealing device, like a rotary cutter, is typically designed with a fixed position, the aforementioned rolling motion occurs here through the longitudinal movement of the textile carrier strip.

[0032] If the sealing device generates a sealing track in the carrier strip non-contactly, this is typically done by heating the carrier strip above the melting point (of the plastic) using electromagnetic radiation, thereby generating the sealing track non-contactly. The electromagnetic radiation used here is typically thermal radiation (infrared radiation). It is also conceivable that the sealing device could use an (infrared) laser, which, for example, utilizes corresponding infrared radiation to desiredly heat the carrier strip above the melting point of the plastic and thus ensure the non-contact generation of the sealing track. A CO2 laser could be used here, for example.

[0033] Of course, there can also be combinations that allow the sealing device to generate a sealing trajectory in a manner that is both contact-based and non-contact-based. In this case, for example, a heating strip or heating roller can be additionally combined with a laser. In this case, an ultrasonic unit is also generally conceivable in order to define a sealing trajectory in the textile carrier strip without cutting the textile carrier strip.

[0034] The present invention also provides an apparatus for manufacturing adhesive tape, as described more in claims 12 and 13. Similarly, it provides an application of an adhesive tape manufactured according to the proposed method, and finally, according to claims 14 and 15, of such an adhesive tape for wrapping cables in automobiles.

[0035] Therefore, a method and related equipment for manufacturing adhesive tape are described, which are convincingly simple in structure and can be particularly flexibly adjusted according to the different widths of the tape to be manufactured. The working principle of the present invention is completely different and opposite to that of the comb-shaped sealing track tool used in the prior art: the sealing track is pre-set on the carrier tape material on the sealing device side. This can be flexibly adjusted according to the width of the tape subsequently required to be manufactured in this manner. Of course, the quantity of tape manufactured from the textile carrier tape can also be varied. All of this can be achieved in a technically simple and therefore cost-effective manner. Furthermore, in this case, a significantly increased production speed is observed, which can reach up to 40 meters per minute, compared to the conventional processing speed of only 10 meters per minute to date. Of course, this is merely exemplary and not intended to be limiting. Attached Figure Description

[0036] The invention will now be described in more detail with reference to the accompanying drawings, which show only one embodiment. The drawings are as follows:

[0037] Figure 1 An overview diagram illustrates an apparatus according to the invention for manufacturing tape and for performing the method according to the invention; and

[0038] Figure 2 The sealing device, including the rotary cutter, is shown in detail. Detailed Implementation

[0039] exist Figure 1 The diagram shows the equipment used to manufacture tape 1. In fact, individual (four in this example) tapes 1 can be seen on the outlet side of the equipment. The tapes 1 are then individually wound onto spools 2 and subsequently mass-produced.

[0040] To manufacture the corresponding tape 1, a textile carrier strip 3 is supplied from the unwinding roller 4 at the inlet side. The textile carrier strip 3 is then fed along... Figure 1 The longitudinal direction L is shown. According to this embodiment, the textile carrier belt 3 is a woven fabric web or a nonwoven fabric web. In addition, the textile carrier belt 1 can also be constructed as a fleece web, a knitted fabric web, etc. Similarly, a combination form can be conceived, that is, a carrier belt 3 made of multiple layers of the above-mentioned different or identical textile webs.

[0041] The textile carrier strip 3 is supplied here by the unwinding roller 4 along the longitudinal direction L. Here, according to this embodiment and not limited to, the carrier strip 3 is additionally provided with an adhesive coating 5, which is applied to the carrier strip 3 beforehand by means of a coating unit (not shown). Here, according to the illustrated embodiment, it is operated such that the carrier strip 3 moves along the longitudinal direction L with its uncoated, upward-facing back side opposite the adhesive coating 5, as shown... Figure 1 As shown. In this process, the uncoated back side of the textile carrier strip 3, according to the invention, first passes through the sealing device 6, then through the optional sensor device 7, and subsequently through the longitudinal cutting device 8 having a plurality of roller cutters 8a. In fact, three roller cutters 8a are provided here, which are correspondingly used to form the respective longitudinal strips (a total of four) and thus form the tape 1 finally wound on the roll 2.

[0042] Each of the roller cutters 8a, according to this embodiment, is capable of longitudinally cutting the carrier strip 3, more precisely, in the form of a so-called extrusion cut. For this purpose, a support roller 8b is provided opposite each roller cutter 8a, which is constructed, or can be constructed, as a steel roller with a hardened surface. Furthermore, in principle, the adhesive coating 5 can be covered with a so-called gasket 13 to prevent possible adhesion of the adhesive coating 5 to the support roller 8b. However, this is not mandatory, but rather an option depending on the adhesive material used in the adhesive coating 5.

[0043] Importantly for this invention is the additional provision of a heatable and fixed-position sealing device 6, by means of which the cutting edges of the adhesive tape 1 produced therefrom, subsequently generated by a similarly fixed-position roller cutter 8a and support roller 8b, are sealed. In fact, the cutting edges are located on both sides of the longitudinal extension of the adhesive tape 1, and are therefore the longitudinal edges of the adhesive tape 1. Particularly important according to this invention is that the sealing device 6 acts spatially and temporally prior to the roller cutter 8. Thus, the sealing device 6 defines sealing trajectories 9 within the textile carrier tape 3.

[0044] from Figure 1 As can be seen from the overview diagram, a total of three sealing tracks 9 are created in the carrier strip 3, or on the back side of its adhesive-free coating, by means of the sealing device 6. These three sealing tracks 9 in the illustrated example correspond to: subsequently cutting the textile carrier strip 3 with the three sealing tracks 9 in the area of ​​the sealing tracks 9, more specifically, by means of the longitudinal cutting device 8 with its three rotary cutters 8a. Thus, the textile carrier strip 3 is cut into a total of four strips 1 after the longitudinal cutting device 8, which are then further divided into two longitudinal strip webs, each of which is ultimately wound onto its corresponding spool 2.

[0045] according to Figure 2 As can be seen from the front view, according to this embodiment, the corresponding sealing device 6 is constructed as a heating strip 6 or heating roller with a predetermined width B. The associated heating roller or heating strip 6, as described in this embodiment, is constructed in a fixed position, similar to the corresponding rotary cutter 8a, while the textile carrier strip 3 moves along it in the longitudinal direction L. Thus, the strip 6 can roll or slide on or along the textile carrier strip 3, just like its corresponding rotary cutter 8a. This can be supported by a driver or by separately driven support rollers 8b or 6a.

[0046] Because strip 6 is heated and has a width B, the heating strip 6 generally ensures that the carrier strip 3, or the plastic fibers and / or filaments realized here, melt at least partially in the area of ​​the subsequently formed sealing track 9. The sealing track 9 produced in this way has a track width B, which is predetermined by or corresponds to the width B of the heating strip 6. Furthermore, the heating strip 6 also ensures that the carrier strip 3 hardens in the area of ​​the sealing track 9 at a track depth T, which corresponds to the total thickness D of the textile carrier strip 3. This is achieved by… Figure 2 The left-hand portion shows the hardened area of ​​the carrier strip 3 within the sealing trajectory 9 region. It is also possible, in principle, that the sealing trajectory 9 is not formed over the total thickness D of the textile carrier strip 3, but only reaches such a trajectory depth and therefore a portion of the thickness T, which is at least 20% of the total thickness D of the carrier strip 3 and according to… Figure 2 The illustration in the right part extends from the heating strip 6 to the opposite back side of the carrier strip 3.

[0047] Within the scope of this embodiment, the sealing device 6 ensures that the sealing trajectory 9 is introduced into the carrier strip 3 in a contact manner, i.e., by means of the heating strip 6, which moves along the carrier strip 3 against it. However, the sealing device 6 can also generate the sealing trajectory 9 in the carrier strip 3 without contact, as described in the background section of the specification. Furthermore, from Figure 2As shown in the diagram, according to this embodiment, the sealing device 6 and the rolling cutter 8a are connected to a holding device 10 fixed in a common position, thus forming a fixed-position functional unit 6, 8. In this case, the sensor device 7 connected in the middle is usually not required.

[0048] However, the sealing device 6 and the roller cutter 8a, or longitudinal cutting device 8, can also be configured to be functionally separate from each other. In this case, the carrier strip 3 with the introduced sealing tracks 9 is first wound up and then unwound in a subsequent step and fed to the longitudinal cutting device 8. In this case, the sensor device 7 upstream of the longitudinal cutting device 8 ensures that each sealing track 9 is also precisely oriented in this way, so that each roller cutter 8a cuts approximately in the middle or can cut the relevant sealing track 9.

[0049] Therefore, in this example, the sensor device 7 is connected to the control unit 11, which itself utilizes... Figure 1 The driver 12 shown loads the shaft of the unwinding roller 4 in the axial direction and thereby allows for lateral displacement of the carrier strip 3 when needed, to achieve and implement the desired alignment between the respective sealing tracks 9 on one hand and the longitudinal cutting device 8, or its respective roller cutters 8a, on the other hand. For this purpose, the sensor device 7 optically scans the sealing tracks 9. In practice, the sensor device 7 can be one or more cameras that can examine the surface or back side of the textile carrier strip 3 and thereby detect the corresponding sealing track 9 and its position. This is because the back side of the textile carrier strip 3 has a different surface structure in the area of ​​the sealing track 9, which can be detected, for example, by image comparison using the sensor device 7 and the control unit 11.

[0050] In either case, the sealing device 6 is heated to a temperature higher than the melting point of the carrier strip 3. Specifically, this means that the temperature of the sealing device 6 and the heating roller 6 according to this embodiment is higher than the melting point of the plastic from which the plastic fibers / filaments (which in turn form the textile carrier strip 3) are made. In practice, polyester fibers, polyamide fibers, etc. (to name only some plastics conceivable for plastic fibers) can be used here. The textile carriers that can be processed here are explicitly unrestricted. That is, fabrics, nonwovens, knitted fabrics, fleece, and hybrid forms can be processed. Polyester, polyamide, PET, or even PVC can be used as conceivable plastic fibers or plastic filaments, as long as the temperature of the heating strip 6 is ensured to exceed the temperature of the plastic used, such that the fibers and / or filaments forming the textile carrier 3 are at least partially melted in the area of ​​the separately generated sealing track 9 and a sealing track 9 having a track width B and a track depth T is produced. This can also be achieved in principle non-contactly by the non-contact operating sealing device 6, although this is not shown in this embodiment.

[0051] The heating strip 6 can be made of materials such as iron or steel, aluminum or copper. In this case, it is also conceivable to use a strip 6 made of ceramic or with a ceramic coating to avoid possible adhesion. Among possible ceramics, aluminum nitride has proven particularly advantageous. In contrast, the rolling cutter 8a is typically made of steel. For the support rollers, or support rolls 8b or 6a, steel, or plastic or rubber, is used as the coating for the steel rollers. In principle, the support rolls 6a and 8b can also be constructed entirely of hardened steel rollers.

[0052] List of reference numerals in the attached diagram:

[0053] 1. Adhesive tape / textile carrier tape

[0054] 2-spool / winding roller

[0055] 3 (Textile) Carrier Belt

[0056] 4 Unwinding Rollers

[0057] 5. Adhesive coating

[0058] 6. Sealing device / (heating) roller

[0059] 6a support roller

[0060] 7 sensor devices

[0061] 8. Longitudinal cutting device

[0062] 8a Roller Cutter

[0063] 8b support roller

[0064] 9 sealing trajectory

[0065] 10 Holding device

[0066] 11 control units

[0067] 12 drives

[0068] L longitudinal direction

[0069] B width / Track width

[0070] D Total Thickness

[0071] T-trajectory depth.

Claims

1. Method for manufacturing adhesive tape (1), in particular a wrapping tape for bundling cables in a motor vehicle, wherein, a textile carrier web (3), optionally with an adhesive coating (5), is supplied from a roll-off roller (4) in a longitudinal direction (L) and cut into longitudinal strips by means of a longitudinal cutting device (8), and, further, the longitudinal cutting device (8) has at least one rotary knife (8a), and a heatable sealing device (6) is additionally provided, by means of which the cut edges of the adhesive tape (1) are sealed, characterized in that the sealing device (6) acts spatially and temporally before the longitudinal cutting device (8) and defines a sealing track (9) in the carrier web (3), which is cut open by the subsequent rotary knife (8a).

2. The method of claim 1, wherein, The sealing device (6) and the longitudinal cutting device (8) form a functional unit (6, 8).

3. The method of claim 1, wherein, The sealing device (6) and the longitudinal cutting device (8) are configured to be functionally separate from one another.

4. The method according to any one of claims 1 to 3, characterized in that, The sealing track (9) is aligned relative to the rotary knife (8a) or vice versa by means of a sensor device (7).

5. The method of claim 4, wherein, The sensor device (7) scans the sealing track (9), for example optically detects the sealing track by means of a video camera.

6. The method according to any one of claims 1 to 5, characterized in that, The textile carrier web (3) is made at least predominantly from plastic, for example from at least 50 mass percent of plastic fibers and / or plastic filaments.

7. The method according to any one of claims 1 to 6, characterized in that, The sealing device (6) generates the sealing track (9) in the carrier web (3) in a contactless and / or contact manner.

8. The method according to any one of claims 1 to 7, characterized in that, The sealing device (6) in particular heats the plastic, preferably the plastic fibers and / or plastic filaments, in the carrier web (3) such that the plastic or the plastic fibers and / or plastic filaments melt at least in the region of the sealing track (9).

9. The method of claim 8, wherein, The plastic fibers and / or plastic filaments are connected to one another in the sealing track at least to a partial thickness (T) of the carrier web (3) relative to its total thickness (D).

10. The method according to any one of claims 1 to 9, characterized in that, The sealing device (6) is heated above the melting point of the carrier web (3) and generates the sealing track (9) by contact with the carrier web (3).

11. The method according to any one of claims 1 to 10, characterized in that, The sealing device (6) heats the carrier web (3) above the melting point by means of electromagnetic radiation and thereby forms the sealing track (9) in a contactless manner.

12. An apparatus for manufacturing adhesive tape, in particular a wrapping tape for bundling cables in a motor vehicle, the apparatus preferably being used to carry out the method according to any one of claims 1 to 11, the apparatus comprising a roll-off roller (4) for accommodating and conveying a textile carrier web (3), optionally with an adhesive coating (5), in a longitudinal direction (L), the apparatus further comprising a longitudinal cutting device (8) with at least one rotary knife (8a) and an additionally provided heatable sealing device (6) for sealing the cut edges of the textile carrier web (3) cut into longitudinal strips by the longitudinal cutting device (8) and thus of the adhesive tape (1), characterized in that The sealing device (6) acts in space and time before the longitudinal cutting device (8) and defines a sealing track (9) in the carrier tape (3), which is cut open by the subsequent rotary knife (8a).

13. The apparatus of claim 12, wherein, Between the sealing device (6) and the longitudinal cutting device (8) a sensor device (7) is provided for aligning the respective sealing track (9) relative to the rotary knife (8a) or vice versa.

14. A tape, in particular a wrapping tape for bundling cables in a car, manufactured according to the method of any one of claims 1 to 11.

15. Use of the adhesive tape according to claim 14 as a wrapping tape for bundling cables in a car, wherein, The tape (1) is wound helically or as a longitudinal wrap around the cables and is bonded.

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