Application device for the application of web-shaped adhesive elements

Abstract

The invention relates to an application device (10) for the application of web-shaped adhesive elements (12), comprising: i) a first reel receptacle (14), the first reel receptacle (14) being designed such that an adhesive tape reel (16) filled with a web-shaped adhesive element (12) can be arranged rotatably in the first reel receptacle (14), ii) a rotatable pre-feed roller (18), and iii) a rotatable application roller (20), the lateral surface (22) of the application roller (20) having a depression (24) running along the circumferential direction, wherein the application device (10) is designed such that a web-shaped adhesive element (12) provided by an adhesive tape reel (16) arranged in the first reel receptacle (14) can be guided via the pre-feed roller (18) to the application roller (20), wherein the application roller (20) and the pre-feed roller (18) are coupled to a first coupling mechanism (26) such that rotation of the application roller (20) brings about rotation of the pre-feed roller (18).

Description

[0001] Application device for the application of web-shaped adhesive elements

[0002] Description

[0003] The invention relates to an application device for the application of web-shaped adhesive elements and a corresponding method for the application of web-shaped adhesive elements with a corresponding application device.

[0004] Joining separate elements is one of the central processes in manufacturing technology. Along with other methods such as welding and soldering, bonding—that is, joining using an adhesive—is playing a particularly important role today. An alternative to the use of formless adhesives, such as those applied from a tube, is so-called adhesive tapes, whose adhesive effect is based on the adhesive masses used. The use of adhesive tapes is associated with many advantages that make this technology ideal for use in many industries, such as the electronics or automotive industries.

[0005] For many applications, pressure-sensitive adhesive tapes are particularly relevant. These tapes are made from a pressure-sensitive adhesive that provides the adhesive effect and is permanently tacky and adhesive under normal ambient conditions. These pressure-sensitive adhesive tapes can be applied to a substrate by pressure and remain adhered there, but can later be removed more or less residue-free.

[0006] For joining two separate elements to an adhesive surface, so-called double-sided adhesive tapes, which are adhesive on both sides, especially pressure-sensitive adhesive, have proven particularly useful. Such double-sided adhesive tapes are known to those skilled in the art in many configurations and can, for example, comprise a carrier coated with an adhesive on both sides or be designed without a carrier as so-called transfer tapes. These double-sided adhesive tapes can, for example, be applied to a surface to be bonded in order to subsequently position a second element on the adhesive surface thus formed.

[0007] To improve the handling properties of such double-sided adhesive tapes and to ensure sufficient unwindability, a release liner, also known as a release liner, is usually applied to at least one side of the tape. This release liner, which typically exhibits low adhesion to the coated pressure-sensitive adhesive, for example, due to a siliconized surface, can be removed after application of the tape to expose the second, sticky side of the tape.

[0008] Corresponding double-sided adhesive tapes are familiar from everyday use, although their application is usually carried out manually and using mostly rudimentary tools, especially cutting tools. However, such manual application of double-sided adhesive tapes has proven too inefficient and error-prone for many industrial applications. Against this backdrop, application devices have been developed with which double-sided adhesive tapes can be applied to substrates as reliably and reproducibly as possible. These application devices are often designed not only to apply the web-like adhesive element to a substrate, but also, in many cases, promote or cause the separation of the release liner positioned on the adhesive element.In industrial manufacturing, in addition to traditional double-sided adhesive tapes, web-based adhesive elements are also used. Their handling and / or adhesive properties are specifically tailored to specific applications. Such specialized web-based adhesive elements include, for example, adhesive tapes with a foamed adhesive, such as a foamed (meth)acrylate-based adhesive. Such adhesive tapes with foamed adhesives offer particularly advantageous adhesive properties combined with favorable mechanical properties for many applications.

[0009] A special type of adhesive tape based on foamed adhesives has a passivating layer, such as a polyurethane, on one side of the adhesive layer instead of a traditional release liner. This layer reduces the stickiness of the corresponding surfaces. This results in an easy-to-handle adhesive tape, even without the use of a release liner. The adhesive layer can be applied with the non-passivated side exposed to a release liner, making it non-sticky or only slightly sticky on both sides. When applying such adhesive tapes, the release liner covering the non-passivated side is removed, and the exposed side of the adhesive tape is applied to a substrate.Corresponding adhesive tapes with a foamed adhesive and a passivating surface coating, which are also referred to below as passivated foamed adhesive elements for short, can be designed so that the adhesive penetrates the passivation when pressure is applied, so that the adhesive tape only behaves like a double-sided adhesive tape after such a pressure application, especially only after a longer period of time. Such passivated foamed adhesive tapes are commercially available from various suppliers, for example from tesa under the trade name "ACXplus 76730 Box Seal," and are frequently used for sealing containers. The advantage is that the material bond only develops over time, allowing the containers to be opened relatively easily immediately after closure.Further information on the use of adhesive elements in sealing containers is disclosed, for example, in DE102020200450 B4, DE 102020200452 A1 and WO2021144306 A1.

[0010] One industry in which double-sided adhesive tapes in general, and passivated, foamed adhesive tapes in particular, are regularly used is the automotive industry. For example, such adhesive tapes are used to seal batteries in vehicles, where they are used in particular to secure battery covers to the corresponding battery housings. In this application, the use of passivated, foamed adhesive tapes offers particular advantages: pressing the battery cover onto the prepared housing causes or promotes the penetration or diffusion of the foamed adhesive through the passivating layer, and over time, a correspondingly resilient bond between the two components is formed.

[0011] Adhesive tapes with foamed adhesives, especially those with a passivating surface coating, are often particularly susceptible to mechanical stress, particularly compression along the thickness and tensile stress along the web direction. Accordingly, when applying such adhesive tapes with foamed adhesives, especially those with a passivating coating, it is important in practice to ensure that the tape is not stretched too much during application to prevent tearing of the foamed adhesive layer and / or the passivating layer applied thereon.In addition, it should be ensured that the application pressure is not too high, so that unwanted compression of the adhesive tape during application can be avoided, which results in a local stretching of the passivating layer and can destroy it even before the desired, controlled pressure application, which can be carried out with a pressure roller, for example, is supposed to realize the actual adhesive behavior.

[0012] In the large-scale industrial production of corresponding vehicle components, such as battery boxes, a sufficiently gentle application can usually be ensured through the use of a high degree of automation. The application of the corresponding adhesive tapes is carried out by an application device designed as an end effector, which can be attached, for example, to a sensor-controlled industrial robot. Such a design enables precise guidance of the application device relative to the substrate, thus preventing excessive compression, which would result in undesirable stretching of the passivating layer.In addition, corresponding application devices often have driven guide elements and rollers, which drive the adhesive tape in the application device and wind up the separated release liner, so that the stretch experienced by the adhesive tape can be controlled so that it remains within a tolerance interval.

[0013] Even though the gentle application of such high-performance adhesive tapes is generally straightforward within an automated production line thanks to modern robot control, in practice it may be necessary to open and then reclose sealed containers in the workshop during service or repair work. In smaller companies, however, it is often not possible to close opened battery boxes, for example, using an appropriate industrial robot due to a lack of the necessary equipment. Instead, the reapplication of such adhesive tapes must be carried out by the employees on site without recourse to precisely calibrated automated application devices.For this purpose, so-called hand applicators have been developed in the state of the art, in which a corresponding adhesive tape can be provided and which serve the purpose of improving the application of adhesive tapes during service or repair work in workshops with regard to their time and / or cost efficiency as well as the reproducibility of the result.

[0014] Even though many of the hand applicators known from the prior art achieve good results when processing conventional double-sided adhesive tapes, their suitability for applying pressure- and / or stretch-sensitive adhesive tapes, in particular adhesive tapes with foamed adhesives and / or passivation layers, is often considered inadequate. Particularly when used by workers not specifically trained for this purpose, excessive compression of the applied adhesive tapes can occur when pressed down with such hand applicators. Furthermore, in the hand applicators known from the prior art, the unwinding of the adhesive tape from the adhesive tape reel is usually achieved solely by tension, which is caused by the adhesion of the adhesive tape to the substrate to be bonded when the hand applicator is moved over the substrate.Thus, the force causing unwinding acts through the adhesive tape and results in undesirable stretching of the tape, which poses the risk of compromising the functionality of many high-performance adhesive tapes, for example, by damaging a passivation layer applied to them. The hand-held applicators known from the prior art are therefore often considered unsuitable for applying certain high-performance adhesive tapes, especially passivated, foamed adhesive tapes.

[0015] The primary object of the present invention was to eliminate or at least reduce the disadvantages of the prior art.

[0016] In particular, it was the object of the present invention to provide an application device, in particular a hand applicator, and an application method to be carried out therewith for the application of web-shaped adhesive elements, with which the application of web-shaped adhesive elements should be able to be carried out in a particularly time- and / or cost-efficient manner.

[0017] It was an object of the present invention that the application device to be specified should be designed in such a way that excessive compression of the adhesive tape during application could be prevented. Furthermore, it was an object of the present invention that the application device to be specified should be able to prevent excessive stretching of the adhesive tape during the application process.

[0018] In this respect, it was an object of the present invention that the application device to be specified should ensure a particularly high level of process reliability and should enable the application of adhesive elements in a particularly reproducible manner, wherein the requirements for the training and instruction of the workers employed should desirably be reduced.

[0019] It was a particular object of the present invention that the application device to be specified should be particularly suitable for processing modern high-performance adhesive tapes, in particular adhesive tapes with foamed adhesives, especially those adhesive tapes which are provided with a passivating layer on at least one side and consequently only develop a double-sided adhesiveness after pressure application.

[0020] It was a further object of the present invention that the application device to be specified should be as robust and error-free as possible and, in particular, should enable the application of adhesive tapes with as little stretching as possible even without drive units such as electric motors.

[0021] The inventors of the present invention have now found that the objects described above can be achieved if an application device for the application of web-shaped adhesive elements is provided, in which a rotatable application roller for the application of the adhesive tape is provided, which has a circumferential recess and which is coupled to a pre-feed roller by a coupling mechanism, so that a rotation of the application roller, as occurs, for example, when rolling over a substrate to be bonded, causes a rotation of the pre-feed roller, which can convey the adhesive tape to be applied in the direction of the application roller, as defined in the claims.Advantageously, the circumferential recess, for example in the form of a circumferential groove, ensures that a hollow space is created between the substrate to be bonded and the application roller used for application, through which the adhesive tape to be applied can be guided at the moment of rolling. By dimensioning the circumferential recess, it is possible to specify a desired or maximum compression of the adhesive tape, even in the absence of sensors or automatic control, given the thickness of the adhesive tape to be applied. By coupling the application roller with the pre-feed roller, it is possible to convert the rotational movement of the application roller during the rolling of the adhesive tape to be applied into an additional movement of the pre-feed roller, which supports the provision of additional adhesive tape in the direction of the application roller and thus reduces the stretch experienced by the adhesive tape.

[0022] The reduction in the stretch acting on the adhesive tape during application achievable by the pre-feed roller can be particularly significantly reduced if the pre-feed roller contacts the release liner arranged on the adhesive tape, so that the pre-feed roller exerts a force on the release liner and does not itself cause any additional stretching in the adhesive and / or a passivation layer covering the adhesive. In a particularly advantageous embodiment, this first coupling is combined with a further coupling, so that the rotation of the application roller additionally causes a rotation of the liner winder, so that this creates a pull on the release liner separated before application, which additionally promotes the propulsion of the adhesive tape through the application device and prevents the liner winder from having to be caused solely by the tensile force in the adhesive tape.

[0023] The above-mentioned objects are thus achieved by the subject matter of the invention as defined in the claims. Preferred embodiments of the invention emerge from the subclaims and the following statements. Those embodiments which are referred to as preferred below are combined in particularly preferred embodiments with features of other embodiments referred to as preferred. Combinations of two or more of the embodiments referred to as particularly preferred below are therefore very particularly preferred. Likewise preferred are embodiments in which a feature of an embodiment referred to as preferred to some extent is combined with one or more further features of other embodiments which are referred to as preferred to some extent. Features of preferred methods emerge from the features of preferred application devices.

[0024] The invention particularly relates to an application device for the application of web-shaped adhesive elements, comprising: i) a first roll holder, wherein the first roll holder is designed so that an adhesive tape roll filled with a web-shaped adhesive element can be arranged rotatably in the first roll holder, ii) a rotatable pre-feed roller, and iii) a rotatable application roller, wherein the application roller has a recess running along the circumferential direction on the outer surface, wherein the application device is designed so that a web-shaped adhesive element provided by an adhesive tape roll arranged in the first roll holder can be guided via the pre-feed roller to the application roller, wherein the application roller and the pre-feed roller are coupled to a first coupling mechanism so that a rotation of the application roller causes a rotation of the pre-feed roller.

[0025] The application device according to the invention is used for the application of web-shaped adhesive elements, in particular adhesive tapes. The application device according to the invention is particularly suitable for the application of web-shaped adhesive elements that have a low tolerance to excessive application pressure and / or excessive stretching of the adhesive tape during application, in particular passivated, foamed adhesive tapes.

[0026] Those skilled in the art will understand that, for understanding the invention, it is expedient to define and describe the application device with reference to the web-shaped adhesive element to be applied with the application device. At the same time, however, those skilled in the art will also understand that the web-shaped adhesive element itself, as well as the adhesive tape roll on which the web-shaped adhesive element is provided, are not part of the application device according to the invention.

[0027] It can be seen as an advantage of the application devices according to the invention that they can, at least theoretically, also be designed as an end effector on an automated movement device, for example a robot arm. In these embodiments, advantages arise in that the use of separate drive units, for example electric motors, can be dispensed with and, moreover, the control technology expenditure can be reduced, since ensuring a correct application pressure to avoid unwanted compression of the adhesive tape can also be implemented with systems that are less precisely controlled. However, an application device according to the invention that is designed for manual use, for example during service and / or repair work in a workshop, is particularly advantageous and preferred for essentially all embodiments of the invention.Accordingly, an application device according to the invention is particularly preferred, wherein the application device is a hand-held applicator. Additionally or alternatively, an application device according to the invention is particularly preferred, wherein the application device comprises a handle.

[0028] The application device according to the invention comprises a first roll holder. A roll of adhesive tape filled with adhesive tape can be inserted into this roll holder. The design of the first roll holder ensures that the roll of adhesive tape can be rotated in the application device, for example, by means of a corresponding rotatable bearing. This makes it possible to unwind the web-shaped adhesive element from the adhesive tape roll arranged in the roll holder by pulling on it and to guide it via the other components of the application device to the substrate to be bonded.

[0029] In addition to the roll holder, the application device according to the invention comprises at least one rotatable pre-feed roller and one rotatable application roller, wherein the application device can also comprise further guide elements with which a more complex web guidance of the adhesive tape can be realized in the application device. The individual components can expediently be fixed relative to one another on a carrier plate, wherein a housing can also be provided. In these cases, for example, this is an application device according to the invention, wherein the application device additionally comprises one or more further guide elements, preferably guide rollers, for guiding the web-shaped adhesive element and / or the web-shaped release material.Additionally or alternatively, it is an application device according to the invention, wherein the application device comprises a base plate, wherein the first roller holder, the pre-feed roller and the application roller, as well as optionally the further components of the application device are arranged on the base plate and / or connected to the base plate.

[0030] The roll holder, the pre-feed roll and the application roll are arranged in the application device in such a way that the adhesive tape provided by the adhesive tape roll in the roll holder can be guided via the pre-feed roll to the application roll, wherein the arrangement of the elements is advantageously such that the web-shaped adhesive element provided by the adhesive tape roll can be guided over the pre-feed roll with the side which is covered with a web-shaped release layer, in particular a release liner, in order to transfer the conveying effect exerted by the pre-feed roll to the web-shaped release layer and to exert the least possible tension on the adhesive mass present in the web-shaped adhesive element.The additional conveying effect of the pre-feed roller is ensured in application devices according to the invention by coupling this pre-feed roller to the application roller via a first coupling mechanism, so that rotation of the application roller causes rotation of the pre-feed roller. This means that the application roller can be rolled over the substrate during application, and the resulting rotation via the coupling mechanism causes rotation of the pre-feed roller, which conveys the web-shaped adhesive element toward the application roller.

[0031] At least in principle, an improvement can be achieved by using the pre-feed roller coupled to the application roller even if the pre-feed roller contacts the adhesive of the web-shaped adhesive element. However, in the inventors' estimation, such a configuration is less preferred, since in this case the pre-feed roller can exert undesired stretching on the adhesive layer present in the web-shaped adhesive element or on any passivation layer. A more advantageous configuration results when the pre-feed roller is used to achieve the desired conveying effect in the direction of the application roller by acting on the release liner, i.e., the web-shaped release material.The release liner, which is present in the vast majority of corresponding adhesive tapes anyway, is generally relatively resistant to tensile forces and allows the more vulnerable parts of the web-shaped adhesive element, in particular a foamed adhesive and a passivating layer arranged thereon, to be guided through the application device as gently as possible. Accordingly, it is particularly preferred for essentially all embodiments if the ultimately necessary separation of the release liner in the application device takes place only downstream of the pre-feed roller, relative to the path of the adhesive tape in the application device.Accordingly, an application device according to the invention is preferred, wherein the application device is designed such that a web-shaped release material arranged on a web-shaped adhesive element guided in the application device is separated from the web-shaped adhesive element in front of the application roller and after the pre-feed roller with respect to the web path in the application device, preferably at a separating edge, in particular a knife edge, wherein the web-shaped release material is deflected at the separating edge relative to the web path of the web-shaped adhesive element particularly preferably by 90° or more, preferably by 110° or more.

[0032] At least theoretically, it is conceivable to remove the release liner separated from the web-like adhesive element in the application device in a largely uncontrolled manner, for example, by dispensing it loosely from the application device. However, according to the inventors, it is particularly advantageous if the removed release liner is instead wound directly onto a suitable take-up reel. This can, in particular, facilitate the disposal or recycling of the wound release liner.

[0033] In the inventors' opinion, two different options are particularly suitable for implementing this embodiment. Firstly, a largely permanently installed, rotatable take-up roll can be provided in the application device, to which the release liner detached from the web-shaped adhesive element can be guided. A corresponding structure can be designed to be particularly robust. Alternatively, there is an embodiment in which the application device according to the invention has a second roll holder in which an empty take-up roll for winding up the release liner can be arranged so that it can be replaced reversibly and non-destructively, so that replacing a roll completely filled with unwound release liner is particularly easy. Therefore, an application device according to the invention is preferred, wherein the application device additionally comprises: iv.a) a rotatable take-up roll, or iv.b) a second roll holder, wherein the second roll holder is configured to allow a take-up roll to be rotatably arranged in the second roll holder, wherein the application device is configured to allow a web-shaped release material separated by a web-shaped adhesive element guided in the application device to be wound onto the take-up roll. At least theoretically, it is conceivable for the take-up roll to be operated manually at regular intervals in order to wind up the separated release liner. Likewise, it is at least in principle conceivable for the take-up roll to be pre-tensioned, for example, and / or to exert continuous tension via an electric motor, so that the separated release liner is wound up partially automatically.In the inventors' opinion, however, corresponding embodiments are less advantageous because they involve either greater manual effort or increased complexity of the application device or increased energy consumption and potentially increased maintenance effort. Against this background, the inventors propose that the take-up roll can also be coupled synergistically to the application roll via a second coupling mechanism, so that rotation of the application roll also causes rotation of the take-up roll. This results in a particularly advantageous embodiment in which the rotation of the application roll caused by the rolling not only causes a conveying movement of the pre-feed roll, but also a pull on the web-shaped release material, which enables particularly low-stretch conveyance of the adhesive tape through the application device.Particularly preferred is an application device according to the invention, wherein the application roller and the winding roller are coupled to a second coupling mechanism, so that a rotation of the application roller causes a rotation of the winding roller.

[0034] To further minimize the tensile force experienced by the adhesive tape during application, a drive for the adhesive tape roll used to provide the adhesive tape can be added to the first roll holder in addition or alternatively. This supports the unwinding movement, and the rotation of the adhesive tape roll in the first roll holder does not have to be achieved exclusively by the tension on the web-shaped adhesive element or its web-shaped release material. Here, too, it would be conceivable, at least theoretically, to provide an electric motor to ensure the necessary rotation. However, this design would disadvantageously increase the complexity of the application device, its energy consumption, and the potential maintenance requirements.Accordingly, the inventors propose that any desired drive of the adhesive tape roll in the first roll receptacle can be achieved synergistically by a coupling mechanism by which the application roll and the first roll receptacle can be coupled to one another. For certain applications, particularly for the application of particularly stretch-sensitive adhesive tapes, an application device according to the invention is preferred, wherein the application roll and the first roll receptacle are coupled by a third coupling mechanism, so that rotation of the application roll causes rotation of an adhesive tape roll arranged in the first roll receptacle.

[0035] Those skilled in the art will understand that the pre-feed roller in application devices according to the invention serves to exert a tensile force on the web-shaped adhesive element or, particularly preferably, on a web-shaped release material arranged on the web-shaped adhesive element, and that for this purpose a certain degree of friction must be present between the surface of the pre-feed roller and the web-shaped adhesive element or release material, which can ensure appropriate drive. Particularly in application devices according to the invention in which the pre-feed roller engages the web-shaped release material, which is also held under tension by a likewise driven take-up roller, the resulting contact pressure of the web-shaped release material on the pre-feed roller makes it possible in many cases to achieve sufficient propulsion with the pre-feed roller even without further structural design.

[0036] However, in order to improve the force effect of the pre-feed roller on the web-shaped adhesive element, a so-called counter-roller can also be provided, so that a gap is formed between the pre-feed roller and the counter-roller, through which the web-shaped adhesive element is guided, wherein in particular with a spring-loaded counter-roller, the web-shaped adhesive tape can be pressed onto the pre-feed roller, as a result of which a good force transmission from the pre-feed roller to the web-shaped adhesive element or release material can be ensured.The use of a corresponding counter roller is, in the inventors' opinion, also advantageous because it ensures advantageous fixing of the web-shaped material inside the application device even away from any driven liner winding, so that additional stabilization of the guide path of the web-shaped adhesive element in the application device according to the invention is achieved. Accordingly, an application device according to the invention is particularly preferred, wherein the application device additionally comprises: v) a rotatable counter roller, wherein the counter roller forms a roller gap with the pre-feed roller arranged between the counter roller and the pre-feed roller, wherein the application device is designed so that the web-shaped adhesive element guided in the application device can be guided through the roller gap to the application roller.Very particularly preferred is an application device according to the invention, wherein the counter roller is spring-mounted, so that the roller gap can be widened against the spring force of the spring mounting and / or so that the counter roller exerts a predetermined contact pressure on the pre-feed roller on the web-shaped adhesive element guided in the roller gap.

[0037] When using a corresponding counter roller, the inventors believe it is often sufficient if it is mounted for rotation with as little resistance as possible, thus resulting in as little energy loss as possible when guiding the web-shaped adhesive element. Eliminating a drive for the counter roller reduces energy and maintenance requirements and allows for a particularly robust design of the application device.

[0038] In embodiments in which the counter roller engages an adhesive layer—unlike with passivated adhesive tapes—it is expedient to equip the counter roller with a reduced-adhesion surface. Particularly in embodiments in which the counter roller contacts an at least partially tacky surface, the inventors believe it is also expedient to design the counter roller as a driven roller, whereby, in cooperation with the pre-feed roller, a particularly efficient pre-feed effect can be achieved. Even if the use of an electric motor or other drive would be conceivable, at least theoretically, the inventors propose that a coupling to the application roller can also be used here, which can be achieved via a fourth coupling mechanism.For certain applications, an application device according to the invention is therefore preferred, wherein the application roller and the counter roller are coupled to a fourth coupling mechanism, so that a rotation of the application roller causes a rotation of the counter roller.

[0039] In light of the above, it becomes clear that, in addition to the pre-feed roller, the liner winder and / or the adhesive tape roll used for supply and / or the counter-roller can also be driven via a corresponding coupling mechanism. If two or more coupling mechanisms are present, it is preferred if they are formed by an overall coupling mechanism, so that the individual components of the application device according to the invention are coupled in series, for example, via intermediate wheels. In particular, the application roller, the pre-feed roller, and the winder roller can be advantageously coupled to one another.Accordingly, an application device according to the invention is preferred, wherein the first coupling mechanism and the second coupling mechanism are formed by an overall coupling mechanism, so that a rotation of the application roller causes a rotation of the pre-feed roller and the take-up roller, wherein the overall coupling mechanism preferably additionally comprises the third coupling mechanism and / or the fourth coupling mechanism.

[0040] The question of the extent to which a coupling mechanism must maintain or invert the direction of rotation of the respective elements in order to ensure sufficient functionality depends significantly on the positioning of the corresponding elements in the application device according to the invention, but can be easily adjusted by a person skilled in the art given the invention. In the inventors' opinion, in particularly preferred embodiments, the direction of rotation for the pre-feed roller and the take-up roller will be inverted relative to the application roller, while it may be expedient to maintain the same direction of rotation for the counter roller and the supplying adhesive tape roller, the coupling of which is less preferred. An application device according to the invention is preferred, wherein the application roller and the pre-feed roller are coupled in such a way that a rotation of the application roller causes a rotation of the pre-feed roller in the opposite direction of rotation.Additionally or alternatively, an application device according to the invention is preferred, wherein the application roller and the take-up roller are coupled in such a way that rotation of the application roller causes rotation of the take-up roller in the opposite direction of rotation. Additionally or alternatively, an application device according to the invention is also preferred, wherein the application roller and the counter-roller are coupled in such a way that rotation of the application roller causes rotation of the counter-roller in the same direction of rotation. Additionally or alternatively, an application device according to the invention is also preferred, wherein the application roller and the first roll holder are coupled in such a way that rotation of the application roller causes rotation of an adhesive tape roll arranged in the first roll holder in the same direction of rotation.

[0041] According to the inventors, both force-locking and form-locking transmissions are suitable for the design implementation of the coupling mechanisms. The different types of transmissions have different advantages and disadvantages. Form-locking transmissions generally allow for particularly reliable and controlled power transmission. In contrast, force-locking transmissions advantageously allow for the prevention of an unwanted increase in force by adjusting the slip, which can occur, for example, in the case of a coupled liner winding system with an increasing diameter of the liner wound on the winding roll.Thus, on the one hand, an application device according to the invention is preferred, wherein the first coupling mechanism and / or the second coupling mechanism and / or the third coupling mechanism and / or the fourth coupling mechanism, preferably all coupling mechanisms, are based on a force-locking coupling. Additionally or alternatively, on the other hand, an application device according to the invention is preferred, wherein the first coupling mechanism and / or the second coupling mechanism and / or the third coupling mechanism and / or the fourth coupling mechanism, preferably all coupling mechanisms, are based on a form-locking coupling. Individual coupling mechanisms can also be based on two or more different transmission types, for example by using both gears and belts.

[0042] The inventors have identified particularly suitable designs for the configuration of the coupling mechanisms, wherein the various technologies can also be combined. The inversion of the direction of rotation described above can be achieved in traction drives, for example, by inverting the belt guide, while in gear drives, for example, this can advantageously be achieved directly by the direct engagement of two gears arranged on the respective shafts. An application device according to the invention is preferred, wherein the first coupling mechanism and / or the second coupling mechanism and / or the third coupling mechanism and / or the fourth coupling mechanism comprises a traction drive, in particular a belt drive, a chain drive or a toothed belt drive, preferably a belt drive, particularly preferably with a crossed belt guide.Additionally or alternatively, an application device according to the invention is preferred, wherein the first coupling mechanism and / or the second coupling mechanism and / or the third coupling mechanism and / or the fourth coupling mechanism comprises a gear train, in particular a toothed gear train or a friction gear train.

[0043] The adhesive element to be applied will usually be provided in the subsequent application from a material roll comprising a very long web-shaped adhesive element. In most applications, not all of the adhesive tape present on the adhesive tape roll will be applied in one piece. In order to enable particularly efficient process control and reduce the need for additional tools, the inventors propose that the application device can additionally be provided with a separating device, which can be designed, for example, as a cutting device. For a particularly advantageous integration of this separating device into the application device according to the invention, it is expedient to insert this separating device between the application roll and the pre-feed roll with respect to the web direction.Accordingly, an application device according to the invention is preferred, wherein the application device additionally comprises: vi) a separating device, wherein the separating device is designed to separate the web-shaped adhesive element guided in the application device in front of the application roller with respect to the web path in the application device, wherein the separating device is preferably a cutting device.

[0044] Particularly in configurations in which the pre-feed roller's pre-feed action on the web-shaped adhesive element is mediated via the web-shaped release material, it is expedient to arrange the separating device such that it only separates the web-shaped adhesive tape after the web-shaped release material has been separated. Alternatively, the separating device can be positioned such that the separation of the web-shaped adhesive element occurs in an area where it is still connected to the web-shaped release material. In this case, however, the inventors believe it is expedient to design the separating device such that it does not, or at least does not completely, separate the web-shaped release material.

[0045] In their own experiments, the inventors have found that cutting the adhesive tape, particularly in the case of foamed adhesives, can lead to a deformation of the adhesive, which is pushed sideways, so that the width of the adhesive tape increases transversely to the web direction. For this reason, the inventors propose that it is expedient to make the cutting edge of the cutting device wider than the adhesive tape to be cut with it. In this respect, an application device according to the invention is preferred, wherein the cutting edge of the cutting device is wider than the width of the web-shaped adhesive element orthogonal to the web direction, preferably by 10% or more wider, particularly preferably by 20% or more wider, especially preferably by 30% or more wider.In addition or alternatively, an application device according to the invention is particularly preferred, wherein the cutting edge of the cutting device orthogonal to the web direction has a width in the range from 6 to 20 mm, preferably in the range from 7 to 15 mm, particularly preferably in the range from 8 to 10 mm.

[0046] The above statements deal in particular with the advantageous, low-stress guidance of the web-shaped adhesive element in the application device. However, the application device according to the invention also features a specifically designed application roller, which also contributes to reducing the mechanical stresses acting on the adhesive tape. This application roller comprises a circumferential recess on the outer surface in which the web-shaped adhesive element can be guided, whereby the recess will in many cases also extend into the outer surface. In accordance with expert understanding, the outer surface of the regularly cylindrical or disc-shaped application rollers is the circumferential wall surface running parallel to the axis of rotation.The circumferential recess serves to prevent the adhesive strip to be applied from being squeezed between the substrate surface and the flat outer surface of the application roller during application, where it would be directly exposed to the pressure exerted by the user. The recess creates a cavity between the substrate and the application roller in which the adhesive tape is positioned during application. This not only fixes the position of the adhesive tape transversely to the application direction, but the resulting cavity also ensures that the side edges of the circumferential recess resting on the substrate limit the deformation effect of the application roller on the applied adhesive tape.In the inventors' opinion, the cross-sectional shape of the circumferential recess should essentially be adapted to the cross-sectional shape of the adhesive element to be applied and, at least with regard to the width dimension, also to the width of the adhesive element to be applied in order to enable particularly gentle application. An example is an application device according to the invention, wherein the circumferential recess has an average depth in the range of 1 to 5 mm, preferably in the range of 2 to 4 mm, in the radial direction relative to the edge of the circumferential recess. An example is additionally or alternatively an application device according to the invention, wherein the circumferential recess has a U-shaped or rectangular, preferably a rectangular, cross-section in the sectional plane running parallel to the axis of rotation.

[0047] Since in the application device according to the invention the rotation of the application roller is to be transmitted to other rotatable elements of the application device by coupling, the inventors propose taking suitable measures to ensure that the application roller exhibits good friction with the underlying substrate, so that the rolling of the substrate can reliably cause rotation of the application roller and the application roller does not slide over the substrate without rotating. For this purpose, the inventors propose that the corresponding outer surface of the application roller be provided with friction elements that ensure particularly good grip on the substrate surface, for example, plastic elements.The anti-slip properties enable rolling contact between the application roller and the substrate without slipping, which not only ensures secure web guidance but also prevents unwanted slippage, ensuring that the unrolled length of the web-shaped adhesive element is precisely matched to the rotations of the application roller. The inventors have identified the use of plastic rings as a particularly advantageous design, which can be advantageously arranged on both sides of the circumferential recess.In this case, the circumferential friction elements can also form part of the side wall of the recess, for example because two plastic rings are placed on an otherwise flat outer surface and thereby form the circumferential recess between them, or because the two plastic rings are placed on the outer surface in such a way that they flank a circumferential recess formed in the outer surface and thereby increase its effective depth. An application device according to the invention is preferred, wherein the application roller comprises a circumferential friction element along the axial direction above and / or below, preferably above and below, the circumferential recess, preferably as part of the edge of the circumferential recess, wherein the circumferential friction element is preferably designed as a plastic ring.

[0048] In light of the above statements, the invention also relates to a method for applying web-shaped adhesive elements using an application device according to the invention, comprising the method steps: a) providing an adhesive tape roll filled with a wound web-shaped adhesive element in the first roll receptacle of the application device, b) arranging a free end section of the web-shaped adhesive element in the application device such that the web-shaped adhesive element runs between the application roll and the adhesive tape roll in such a way that the web-shaped adhesive element is guided over the pre-feed roll relative to the path in the application device between the application roll and the adhesive tape roll, and c) applying the web-shaped adhesive element to a substrate to be bonded, wherein the web-shaped adhesive element is guided through the circumferential recess of the application roll during application,wherein the application roller is rolled over the substrate to be bonded during application, wherein the rotation of the application roller is controlled by the first,

[0049] Coupling mechanism causes a rotation of the pre-feed roller, and wherein the rotation of the pre-feed roller caused by the first coupling mechanism conveys the web-shaped adhesive element in the direction of the application roller with respect to the web path in the application device.

[0050] Preferred embodiments of the method according to the invention result from the use of preferred application devices according to the invention.

[0051] A method according to the invention is therefore preferred, wherein the application device is moved manually during application.

[0052] Consequently, in addition or alternatively, a method according to the invention is also preferred, wherein in method step b) a web-shaped release material arranged on the free end section of the web-shaped adhesive element is separated from the web-shaped adhesive element and guided to the take-up roll.

[0053] Additionally or alternatively, a method according to the invention is also preferred, wherein during application, a web-shaped release material arranged on the web-shaped adhesive element is separated from the web-shaped adhesive element and wound up on the take-up roll.

[0054] Additionally or alternatively, a method according to the invention is also preferred, wherein the rotation of the application roll by the second coupling mechanism causes a rotation of the winding roll, and wherein the rotation of the winding roll caused by the second coupling mechanism causes the winding of the web-shaped separating element on the winding roll.

[0055] In addition or alternatively, a method according to the invention is preferred, wherein the rotation of the application roll by the third coupling mechanism causes a rotation of the adhesive tape roll, and wherein the rotation of the adhesive tape roll caused by the third coupling mechanism promotes the unwinding of the web-shaped adhesive element from the adhesive tape roll.

[0056] Additionally or alternatively, a method according to the invention is also preferred, additionally comprising the method step: d) severing the web-shaped adhesive element guided in the application device with the severing device, wherein the severing takes place in front of the application roller with respect to the web path in the application device.

[0057] In this respect, a method according to the invention is additionally or alternatively preferred, wherein the separation is carried out with a cutting device, wherein the cutting edge of the cutting device is wider than the width of the web-shaped adhesive element orthogonal to the web direction, preferably by 10% or more wider, particularly preferably by 20% or more wider, especially preferably by 30% or more wider.

[0058] Additionally or alternatively, a method according to the invention is also preferred, wherein the separation of the web-shaped adhesive element guided in the application device takes place at a section of the web-shaped adhesive element at which the web-shaped adhesive element has not yet been separated from web-shaped release material.

[0059] Additionally or alternatively, a method according to the invention is further preferred, wherein the separation of the web-shaped adhesive element guided in the application device is carried out in such a way that the web-shaped release material is not or not completely, preferably not, severed.

[0060] Additionally or alternatively, a method according to the invention is also preferred, wherein the web-shaped adhesive element has an average width orthogonal to the web direction in the range from 4 to 10 mm, preferably in the range from 6 to 8 mm, and / or wherein the web-shaped adhesive element has an average thickness orthogonal to the web direction in the range from 1 to 5 mm, preferably in the range from 2 to 4 mm.

[0061] A method according to the invention is particularly preferred, wherein the substrate to be bonded is a vehicle component, preferably a battery housing.

[0062] With regard to the handling of the adhesive elements, a method according to the invention is also particularly preferred, wherein the web-shaped adhesive element is a pressure-sensitive adhesive element. Accordingly, a method according to the invention is also particularly preferred, wherein the web-shaped adhesive element comprises a pressure-sensitive adhesive.

[0063] A pressure-sensitive adhesive (PSA) is, in accordance with expert understanding, an adhesive that possesses pressure-sensitive adhesive properties, i.e., the ability to form a permanent bond to a substrate even under relatively light pressure. Such pressure-sensitive adhesive tapes can usually be removed from the substrate after use without leaving any residue and are generally permanently tacky even at room temperature, meaning they possess a certain viscosity and initial tack, allowing them to wet the surface of a substrate even under light pressure. The tackiness of a pressure-sensitive adhesive tape results from the fact that a pressure-sensitive adhesive is used as the adhesive.Without wishing to be bound by this theory, it is often assumed that a pressure-sensitive adhesive can be viewed as an extremely viscous liquid with an elastic component, which consequently exhibits characteristic viscoelastic properties that lead to the permanent inherent tack and pressure-sensitive adhesive capacity described above. It is assumed that with corresponding pressure-sensitive adhesives, mechanical deformation leads to both viscous flow processes and the build-up of elastic restoring forces. The partial viscous flow serves to achieve adhesion, while the partial elastic restoring forces are necessary in particular to achieve cohesion. The relationships between rheology and pressure-sensitive tack are known in the art and are described, for example, in "Satas, Handbook of Pressure Sensitive Adhesives Technology", Third Edition, (1999), pages 153 to 203.To characterise the degree of elastic and viscous components, the storage modulus (G') and the loss modulus (G") are usually used, which can be determined by means of dynamic mechanical analysis (DMA), for example using a rheometer, as disclosed, for example, in WO 2015 / 189323. In the context of the present invention, an adhesive is preferably understood to be pressure-sensitive and thus a pressure-sensitive adhesive if, at a temperature of 23°C in the deformation frequency range from 10° to 10. 1 rad / sec G' and G“ each at least partly in the range of 10 3 up to 10 7 Pa lie.

[0064] The person skilled in the art will understand that the method according to the invention using the application device according to the invention is particularly suitable for the application of passivated, foamed adhesive tapes, for example the commercial product ACXplus 76730 Box Seal from tesa.

[0065] Particularly preferred is a method according to the invention wherein the web-shaped adhesive element comprises a foamed adhesive, particularly preferably a (meth)acrylate-based adhesive, very particularly preferably a syntactically foamed adhesive. Additionally or alternatively, particularly preferred is a method according to the invention wherein at least one side of the web-shaped adhesive element comprises an adhesion-reducing coating, preferably a polyurethane-based coating, wherein the web-shaped adhesive element is preferably configured so that the pressure-sensitive adhesive can diffuse through the adhesion-reducing coating under the action of pressure.

[0066] The invention and preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying figures.

[0067] Fig. 1 is a schematic representation of an application device according to the invention in a first preferred embodiment;

[0068] Fig. 2 shows the application device according to the invention of Fig. 1 in a schematic representation of the rear view;

[0069] Fig. 3 is a schematic representation of the application of a web-shaped adhesive element to a substrate with the application roller of an application device according to the invention in a side view;

[0070] Fig. 4 is a schematic front view of the application roller of Fig. 3 during the application of a web-shaped adhesive element to a substrate; Fig. 5 is a schematic representation of a preferred application device according to the invention in a second preferred embodiment; and

[0071] Fig. 6 A schematic representation of the rear view of the application device according to the invention of Fig. 5.

[0072] Fig. 1 shows a schematic front view of an application device 10 according to the invention when carrying out the method according to the invention.

[0073] The application device 10 according to the invention comprises a first roll holder 14, which is designed as a mandrel, on which an adhesive tape roll 16 can be arranged in a reversible and non-destructively replaceable manner, so that it is rotatable. The adhesive tape roll 16 comprises a web-shaped adhesive element 12, on the radially outer side of which a release liner is arranged as a web-shaped release material 32. The common material web of the web-shaped adhesive element 12 and the web-shaped release material 32 is guided through a roller gap 40, which is formed between a pre-feed roller 18 and an oppositely arranged, spring-loaded counter-roller 38.

[0074] A separating device 44 is arranged downstream of the roller gap 40 in the web direction. In the example shown, this separating device is designed as a cutting device, with the cutting edge being approximately 20% wider than the width of the web-shaped adhesive element 12 transverse to the web direction. Downstream of the separating device 44 in the web direction, the material web is guided over a knife edge, at which the web-shaped separating material 32 is deflected by more than 90° and pulled off the web-shaped adhesive element 12. After separation, the web-shaped separating material 32 is guided to a take-up roll 28 and wound up there.

[0075] The take-up roll 28 is rotatably mounted on a second roll holder 30, which is also designed as a mandrel. As soon as the take-up roll 28 is completely filled with wound web-shaped release material 32, it can be removed from the application device 10 and replaced with an empty take-up roll 28. The web-shaped adhesive element 12, freed from the web-shaped release material 32, is guided in the application device 10 behind the knife edge to the application roll 20, over which the web-shaped adhesive element 12 is then rolled onto a substrate 48.

[0076] In the embodiment shown in Fig. 1, the pre-feed roller 18, the counter roller 38, the first roller holder 14, and the second roller holder 30 are each kinematically coupled to one another such that a rotation of the application roller 20 is converted into a rotation of the other rotatable elements. As a result, the web-shaped adhesive element 12 is gently conveyed through the application device 10 to the application roller 20 while simultaneously winding up the web-shaped release material 32.

[0077] Fig. 2 shows a schematic representation of the rear side of the application device 10 of Fig. 1. Shown by hatching are the counter-pulleys of the application roller 20, the pre-feed roller 18, the first roller holder 14, the second roller holder 30 and the counter-roller 38, which are firmly connected to the respective rotation axes. In the example in Fig. 2, the first coupling mechanism 26 and the second coupling mechanism 34 are designed as a common overall coupling mechanism, whereas the third coupling mechanism 36 and the fourth coupling mechanism 42 are also designed as separate overall coupling mechanisms. In the example shown, all coupling mechanisms are implemented exclusively via force-locking belt drives, whereby the use of a crossed belt guide in the first coupling mechanism 26 results in the pre-feed roller 18 and the take-up roller 28 having a direction of rotation that is inverted compared to the application roller 20.

[0078] Fig. 3 shows a schematic representation of a rotatable application roller 20 during the application of a web-shaped adhesive element 12 to a substrate 48. The front view of this structure is shown in Fig. 4. Fig. 4 illustrates that the applied web-shaped adhesive element 12 is guided in the circumferential recess 24 of the application roller 20. Circumferential friction elements 46a, 46b, which are designed as rubber rings, are arranged on either side of the circumferential recess 24. The circumferential friction elements 46a, 46b form the edge of the circumferential recess 24, which also extends into the lateral surface 22. When the web-shaped adhesive element 12 is applied to a substrate 48, the friction elements 46a, 46b contact its surface and prevent the web-shaped adhesive element 12 guided in the circumferential recess 24 from being compressed too strongly.

[0079] 5 and 6 show an application device 10 according to the invention in a particularly preferred embodiment. In this particularly preferred embodiment, the application roller 20 is coupled to the pre-feed roller 18 and the non-replaceable take-up roller 28, wherein the first coupling mechanism 26 and the second coupling mechanism 34 are designed as an overall coupling mechanism. For the overall coupling mechanism, a positive coupling to the application roller 20 in the form of a gear transmission is initially used, by which the direction of rotation is inverted. After the transfer, the rotation is passed on by a toothed belt to an intermediate roller positioned in the rear part of the application device 10, which intermediate roller is in turn coupled to the pre-feed roller 18 and the take-up roller 28 on the front side of the application device via corresponding toothed belts.In the exemplary application device 10 of Figs. 5 and 6, the spring-loaded counter roller 38 is not driven, nor is the adhesive tape roll 16.

[0080] With the application device according to the invention shown in Figs. 1 and 2 or Figs. 5 and 6, even particularly pressure- and strain-sensitive adhesive tapes, especially those with foamed adhesives and passivated surfaces, can be applied reliably and reproducibly with high quality. The design of the application roller 20 advantageously allows for small curve radii during application and, due to the circumferential friction elements 46a, 46b designed as rubber rings, secure and non-slip contact with the substrate 48 to be bonded.

[0081] Application device

[0082] Web-shaped adhesive element

[0083] First roll recording,

[0084] Adhesive tape roll

[0085] Pre-conveyor roller

[0086] Application roll

[0087] lateral surface

[0088] Circumferential recess

[0089] First coupling mechanism

[0090] take-up roll

[0091] Second roll recording

[0092] Web-shaped release material

[0093] Second coupling mechanism

[0094] Third coupling mechanism

[0095] Counter role

[0096] roller gap

[0097] Fourth coupling mechanism

[0098] Separating device from rotating friction element

[0099] Substrat

Claims

Claims 1. Application device (10) for the application of web-shaped adhesive elements (12), comprising: i) a first roll holder (14), wherein the first roll holder (14) is configured such that an adhesive tape roll (16) filled with a web-shaped adhesive element (12) can be rotatably arranged in the first roll holder (14), ii) a rotatable pre-feed roller (18), and iii) a rotatable application roller (20), wherein the application roller (20) has a recess (24) running along the circumferential direction on the outer surface (22), wherein the application device (10) is configured such that a web-shaped adhesive element (12) provided by an adhesive tape roll (16) arranged in the first roll holder (14) can be guided via the pre-feed roller (18) to the application roller (20), wherein the application roller (20) and the pre-feed roller (18) are connected to a first coupling mechanism (26). are linked,so that a rotation of the application roller (20) causes a rotation of the pre-feed roller (18).

2. Application device (10) according to claim 1, wherein the application device (10) is a hand applicator.

3. Application device (10) according to one of claims 1 or 2, additionally comprising: iv.a) a rotatable winding roller (28), or iv.b) a second roller holder (30), wherein the second roller holder (30) is designed so that a winding roller (28) can be arranged rotatably in the second roller holder (30), wherein the application device (10) is designed so that a web-shaped release material (32) separated by a web-shaped adhesive element (12) guided in the application device (10) can be wound up on the take-up roll (28).

4. Application device (10) according to claim 3, wherein the application roller (20) and the take-up roller (28) are coupled to a second coupling mechanism (34) such that rotation of the application roller (20) causes rotation of the take-up roller (28).

5. Application device (10) according to one of claims 1 to 4, wherein the application roller (20) and the first roller holder (14) are coupled to a third coupling mechanism (36) so that a rotation of the application roller (20) causes a rotation of an adhesive tape roll (16) arranged in the first roller holder (14).

6. Application device (10) according to one of claims 1 to 5, additionally comprising: v) a rotatable counter-roller (38), wherein the counter-roller (38) forms with the pre-feed roller (18) a roller gap (40) arranged between the counter-roller (38) and the pre-feed roller (18), wherein the application device (10) is set up so that the web-shaped adhesive element (12) guided in the application device (10) can be guided through the roller gap (40) to the application roller (20).

7. Application device (10) according to claim 6, wherein the counter roller (38) is spring-mounted so that the roller gap (40) can be widened against the spring force of the spring mounting and / or so that the counter roller (38) exerts a predetermined contact pressure on the pre-feed roller (18) on the web-shaped adhesive element (12) guided in the roller gap (40).

8. Application device (10) according to one of claims 1 to 7, wherein the application roller (20) and the counter roller (38) are coupled to a fourth coupling mechanism (42) so that rotation of the application roller (20) causes rotation of the counter roller.

9. Application device (10) according to one of claims 1 to 8, additionally comprising: vi) a separating device (44), wherein the separating device (44) is designed to separate the web-shaped adhesive element (12) guided in the application device (10) in front of the application roller (20) with respect to the web path in the application device (10).

10. Application device (10) according to one of claims 1 to 9, wherein the first coupling mechanism (26) and / or the second coupling mechanism (34) and / or the third coupling mechanism (36) and / or the fourth coupling mechanism (42) are based on a positive coupling.

11. Application device (10) according to claim 10, wherein the first coupling mechanism (26) and / or the second coupling mechanism (34) and / or the third coupling mechanism (36) and / or the fourth coupling mechanism (42) comprises a gear train, in particular a toothed gear train or a friction gear train.

12. Application device (10) according to one of claims 1 to 11, wherein the application roller (20) and the pre-feed roller (18) are coupled such that a rotation of the application roller (20) causes a rotation of the pre-feed roller (18) in the opposite direction of rotation.

13. Application device (10) according to one of claims 1 to 12, wherein the application roller (20) and the winding roller (28) are coupled such that a rotation of the application roller (20) causes a rotation of the winding roller (28) in the opposite direction of rotation.

14. Application device (10) according to one of claims 1 to 13, wherein the application roller (20) comprises a circumferential friction element (46a, 46b) along the axial direction above and / or below the circumferential recess (24).

15. A method for applying web-shaped adhesive elements (12) with an application device (10) according to one of claims 1 to 14, comprising the method steps: a) providing an adhesive tape roll (16) filled with a wound web-shaped adhesive element (12) in the first roll receptacle (14) of the application device (10), b) arranging a free end section of the web-shaped adhesive element (12) in the application device (10) such that the web-shaped adhesive element (12) runs between the application roll (20) and the adhesive tape roll (16) in such a way that the web-shaped adhesive element (12) is guided over the pre-feed roll (18) between the application roll (20) and the adhesive tape roll (16) with respect to the path in the application device (10), and c) applying the web-shaped adhesive element (12) to a substrate (48) to be bonded,wherein the web-shaped adhesive element (12) is guided through the circumferential recess (24) of the application roller (20) during application, wherein the application roller (20) is rolled over the substrate (48) to be bonded during application, wherein the rotation of the application roller (20) by the first coupling mechanism (26) causes a rotation of the pre-feed roller (18), and, wherein the rotation of the pre-feed roller (18) caused by the first coupling mechanism (26) conveys the web-shaped adhesive element (12) in the direction of the application roller (20) with respect to the path of the web in the application device (10).

Images