Method for cutting multi-layer adhesive strips by means of a shearing cut

Abstract

The invention relates to a method for cutting a strip-shaped multi-layer mother adhesive strip (1) comprising at least one carrier and / or at least one liner and at least one adhesive compound layer, by means of a shearing cut using at least two upper blades (21) and at least two lower blades (22) in order to obtain at least one adhesive strip (1a), in which method resilient circular cutters are used as the upper blades (21). The method makes it possible to provide particularly narrow adhesive strips (1a) having a width of less than 4 mm.

Description

[0001] tesa Societas Europaea

[0002] Norderstedt

[0003] Method for cutting multi-layer adhesive tapes by shear cutting

[0004] The invention relates to a method for cutting a web-shaped multilayer adhesive tape comprising at least one carrier and / or at least one liner and at least one adhesive layer into at least one adhesive tape by shearing with at least two upper blades and at least two lower blades. The invention further relates to a method for producing a spooled multilayer adhesive tape, a spooled multilayer adhesive tape obtainable in this way, and its use for bonding displays.

[0005] When converting adhesive tape from parent rolls, such as those obtained after the coating process and typically ranging in width from 0.3 to 2 m, into the finished product, it is often necessary to cut the parent tape to a smaller width. Several cutting processes are available, including blade cutting, crush knife cutting, punching, and shear cutting. Of these processes, shear cutting is particularly preferred, as it produces a particularly smooth cut edge and allows for a clean cut even with adhesive tapes with a greater layer thickness, such as those with foamed components.

[0006] However, shear cutting is limited in terms of the minimum width that adhesive tapes cut in this way can have. Currently, the minimum width of adhesive tapes cut in this way is 4 mm. However, there is a desire to make narrower adhesive tapes available. Such narrower adhesive tapes are required, for example, for attaching displays. Displays have previously been attached primarily using liquid adhesive. Adhesive tape is desirable due to its ease of handling. Due to the narrow frame width of displays, such adhesive tapes must be very narrow. Adhesive tapes this narrow cannot currently be produced by shear cutting.Until now, narrow adhesive tapes have only been obtained by punching: a flat section of adhesive tape the size of the display to be attached is cut and the center is punched out so that only a narrow strip of the desired width remains, which is used to adhere the display. This process leads to excessive amounts of waste, as only a very small portion of the adhesive tape (namely the edge) is used, while the majority, the center section the size of the display, ends up as waste. This is unacceptable for cost and sustainability reasons. Therefore, adhesive tapes pre-cut on a roll or spool, from which a strip of the desired length can be cut, are desirable.

[0007] The main problem when shearing adhesive tape material to a width of less than 4 mm is that a certain amount of pressure must be exerted on the upper blade against the overlap where it contacts the lower blade. Therefore, the round upper blade must be flexible in the axial direction. This is traditionally solved with a blade holder combined with a tension spring. To ensure a stable process and secure fixation of the blade holder on the upper blade roller, the holder has a minimum width of 4 mm. This minimum width also defines the minimum cutting width.

[0008] The object of the present invention was therefore to provide a process that produces adhesive tapes with a smaller minimum width, which would also enable applications requiring narrow adhesive tapes, such as the attachment of displays. In particular, the process should result in adhesive tapes with a smooth cut edge and also be suitable for adhesive tapes with a larger layer thickness.

[0009] This object is achieved by a method as described in the independent claim. The subclaims relate to advantageous developments of the subject matter of the invention. Furthermore, the invention encompasses a multilayer adhesive tape and its use.

[0010] Accordingly, the invention relates to a method of the type mentioned at the outset for cutting a multi-layered mother adhesive tape by means of a shear cut with at least two upper blades and at least two lower blades into at least one adhesive tape, in which self-springing circular blades are used as the upper blade.

[0011] This produces at least one tape that is narrower than the parent tape, as well as two edge strips. Exactly one tape and two edge strips are obtained when using two pairs of blades. Typically, however, more than two pairs of blades are used, cutting multiple tapes from the parent tape. The number of tapes depends on the width of the parent tape and the desired width of the tapes, taking into account the width of the two edge strips.

[0012] Self-springing circular knives, such as those sold under the name “OFD” by Wilhelm Bilstein GmbH & Co. KG, Overath, or under the name “Golden Slit” by Dienes Werke für Maschinenteile GmbH & Co. KG, Overath, are self-springing due to their special geometry and can be mounted on the upper knife shaft without a knife holder. Such knives are described in DE 19730815 C1, DE 19830481 A1 or DE 1842608 LJ. They allow the circular knives to be arranged at a distance of less than 4 mm from one another. In this way, it is possible to cut a material web into adhesive tapes with a width of 2 mm or less, in particular of only 1.5 mm or less, even only 1 mm. The width is particularly preferably from 1 to 4 mm. Other widths between 1 and 4 mm or widths greater than 4 mm are of course also possible.

[0013] In a preferred embodiment, the outer blades, designed as self-springing circular blades, each have a blade, a central opening for holding the self-springing circular blades, and a circumferential blade edge. In the self-springing circular blades, incisions are formed that extend in the circumferential direction of the self-springing circular blades and penetrate the material thickness of the self-springing circular blades to form spring arms between the blade edge and the incisions. Particularly advantageously, the incisions are designed as linear separating cuts and / or as slot-shaped openings in the respective blade.

[0014] In another preferred embodiment, areas with a lower material thickness than the rest of the knife blade are provided in the knife blade of the self-springing circular knives.

[0015] Such designs result in good self-springing properties, which make an additional knife holder with tension spring superfluous and enable the distance between two circular knives to be reduced to well under 4 mm.

[0016] Another problem that can occur when cutting adhesive tape materials is that the material sticks to the knives and the adhesive contaminates the knives, which impairs cutting accuracy. This must be prevented. Particularly with shear cutting, where the material is guided through an upper and a lower knife that slightly overlap and are in contact with each other, the material tends to stick between the knives. This effect increases as the cutting width and thus the gap between the knives becomes narrower. The thickness of the material also influences the adhesion between the knife and the material. To reduce the adhesion between the knives and the material, the upper knives are lubricated in one advantageous embodiment. Lubrication takes place continuously while the machine is running.Lubrication is performed by a lubricating element, which is preferably arranged on the side of the upper blades facing away from the adhesive tape. The lubricating element can be a blade felt, a lubricating strip, or a lubricating block. The lubricating element is particularly preferably designed as a lubricating roller. A roller has the advantage that if one spot becomes dirty, only a slight rotation of the roller is required to immediately resume lubrication with a clean surface.

[0017] Lubrication poses a special challenge when shutting down, or rather, when restarting, the converting device. When the system is restarted, there is a short area on the adhesive tape where cutting occurs without the upper blades being lubricated. The length of this area corresponds to the section of the blade circumference that lies between the lubricating element and the adhesive tape.Even if it is only a short section, it can have a major negative impact on the entire cutting process because the brief moment or short section of unlubricated cutting is enough to cause the adhesive tape to stretch, which in turn can result in the adhesive separating from the liner, rendering the entire product unusable and requiring a completely new start-up of the system. Because with the system at a standstill, the affected area must be cut out and spliced ​​by hand before the system can start up again. In a particularly preferred embodiment, a piece of siliconized liner is placed on the adhesive side of the parent adhesive tape during or after switching off the converting device, with the length of the piece corresponding to the first revolution of the upper blade.This ensures that the upper blade can build up significantly reduced contact and thus less adhesion to the adhesive tape during the first unlubricated rotation.

[0018] As mentioned above, lubricating the upper blade reduces the adhesion between the blade and the material. However, the narrower the tape being cut and the closer the blades are positioned to each other, the more severe the adhesion problem becomes. The problem also increases with increasing tape thickness.

[0019] In order to further reduce the adhesion between the knife and the material, in a particularly advantageous embodiment, at least one of the following parameters is implemented in the method for cutting a band-shaped multi-layer mother adhesive tape: i) Web tension of 200 to 400 cN / cm ii) Overfeed of 0 to 5% iii) Web speed of 5 to 75 m / min iv) Web angle of -15° to 80°

[0020] According to a preferred embodiment of the method, all four of the parameters i) to iv) mentioned are realized simultaneously.

[0021] Web tension refers to the tension exerted on the adhesive tape web as it passes through the adhesive tape processing device, where the cutting process according to the invention takes place. If the web tension is significantly higher than the stated upper value of 400 cn / cm, there is a risk of stretch marks or plastic deformation of the product.

[0022] Lead is the relative difference in rotational speed between a driven shaft and an upstream, also driven reference shaft—hereafter referred to as the "master pull shaft." It is expressed as a percentage. A lead of 0 to 5% ensures particularly favorable tension on the adhesive tapes from the circular blades, thus preventing material buildup due to the resistance of the blades. Furthermore, a correctly adjusted lead reduces the sticking of the material to the blades.

[0023] The web speed is the speed at which the adhesive tape runs through the adhesive tape converting device. And the web angle refers to the angle the adhesive tape forms with respect to the horizontal behind the circular blades. Preferably, at least two of the aforementioned parameters are implemented, particularly preferably three, and most preferably, a combination of all four specified parameters is implemented.

[0024] The present invention also relates to a multilayer adhesive tape, in particular an adhesive tape with a greater layer thickness, which is obtained by the process according to the invention for cutting a band-shaped multilayer mother adhesive tape. Such an adhesive tape can have a very small width, in particular also a width < 4 mm. Such an adhesive tape preferably has a width of 3 mm or less, more preferably a width of 2 mm or less, in particular a width < 1.5 mm or less. Such an adhesive tape particularly preferably has a width in a range from 1 to 4 mm. Such an adhesive tape can comprise any number and arrangement of adhesive and optionally carrier layers and / or liner layers. The adhesive tape particularly preferably has at least one pressure-sensitive adhesive layer.

[0025] The process according to the invention is particularly suitable for adhesive tapes that have at least one pressure-sensitive adhesive layer. The process is also particularly suitable for adhesive tapes that have a greater layer thickness. According to the invention, the term "greater layer thickness" refers to layer thicknesses of 0.5 mm or more. Such greater layer thicknesses are found, for example, in foamed adhesives or carriers. The present invention is therefore particularly suitable for cutting foamed pressure-sensitive adhesive tapes. In a preferred embodiment, foamed acrylate adhesives are used as the foamed adhesives.

[0026] There are two main variants for providing the cut adhesive tape: as a plate reel or as a spool. In a plate reel, the adhesive tape is wound in a single track. Particularly for adhesive tapes with a greater layer thickness (layer thickness over 0.5 mm), winding as a spool, i.e. in such a way that several tracks of the adhesive tape are wound next to one another on a core, is preferred. This is especially true if the adhesive tape is narrow, as a plate reel can then easily be unstable or only a limited number of layers can be wound onto the plate reel. However, for many applications, long, continuous lengths of adhesive tape are desired. These are preferably supplied on spools. 100 m of adhesive tape can easily be provided on a spool, but longer lengths of up to 400 or 500 m or even several thousand meters are also possible.The present invention therefore also encompasses a manufacturing method for producing a spooled, band-shaped, multilayer adhesive tape in an adhesive tape manufacturing device, comprising the steps of a) feeding a wide, multilayer mother adhesive tape, wherein the mother adhesive tape comprises at least one band-shaped carrier and / or at least one liner, each of which is provided with an adhesive on at least one side, from a mother roll; b) cutting the multilayer mother adhesive tape into at least one narrower adhesive tape using the method for cutting a multilayer mother adhesive tape according to one of claims 1 to 7; c) winding the at least one narrower adhesive tape thus obtained onto a spool core to obtain the spooled, band-shaped, multilayer adhesive tape.

[0027] Such a process is typically carried out in a converting device. In a first section of the converting device, the master adhesive tape is fed from a master roll via a master roll unwinder. Preferably, a splicing option is provided for the transition from the end of the master adhesive tape of one master roll to the beginning of the master adhesive tape of a new master roll, for example, in the form of a splicing table. Furthermore, an edge positioning device is preferably provided, over which the master adhesive tape is guided, in order to ensure a continuously constant distance between the rear edge of the material web and the system wall.

[0028] The cutting device with its pairs of circular knives, consisting of self-springing upper knives and associated lower knives, is located in the next section of the converting device. The pairs of circular knives cut the master adhesive tape into narrower adhesive tapes using a shear-cutting process. The self-springing circular knives allow the adhesive tapes to be cut to a width of < 4 mm. If the master adhesive tape is not to be cut completely into narrower adhesive tapes, a master roll winder can be provided in the second section, onto which any remaining material from the master roll is wound. If the entire master adhesive tape is to be cut into narrower adhesive tapes, this master roll winder is not required. Advantageously, the cut adhesive tapes are separated and guided by rollers arranged at different heights.By arranging the rollers at different heights, the different angles the adhesive tape can have relative to the horizontal behind the circular blades can be achieved. The angle of the individual cut adhesive tapes can also be individually adjusted using additional guidance equipment such as guide rollers or pins on magnetic holders.

[0029] A further difficulty in the processing of adhesive tapes, particularly thicker pressure-sensitive adhesive tapes, is that the adhesive tape sticks to itself. Therefore, the individual layers are usually separated from each other by a liner. If long lengths of adhesive tape are required, as explained above, processing on a spool is often preferred over processing as a (plate) roll. Especially in the case of narrow adhesive tapes, the length of an adhesive tape processed as a plate roll is limited for reasons of stability. If the pressure-sensitive adhesive tapes are to be processed as a spool rather than a plate roll, it is usually not sufficient for thicker pressure-sensitive adhesive tapes to only cover the top side of the adhesive layer with a liner, as the adhesive tapes can also stick to each other laterally.

[0030] Particularly preferably, in the above-described finishing process, a further step of applying an interliner to the adhesive mass takes place between step b) and step c), wherein the interliner has a greater width than the adhesive tape and is applied in such a way that the interliner protrudes on both sides of the adhesive tape. The interliner is applied in a laminating device.

[0031] This also allows for side coverage using interliners. Because the adhesive layer is covered with an interliner that is wider than the adhesive tape, meaning the interliner extends on both sides of the tape, the interliner is pressed down by the tape on the side where the next piece of tape is applied when the reel is wound, thus forming a separating layer between the two sides of the adhesive layer of the tape.

[0032] There are several options for applying the interliner. For example, the interliner can be applied from an interliner master roll as a wide strip to several adhesive tapes arranged at a distance from one another. The spacing is preferably the width of the overlapping portion of the interliner width. The interliner is then cut to produce individual adhesive tapes laminated with interliner. In another variant, the adhesive tapes are provided with individual interliner strips that have already been cut. Further cutting is then unnecessary. The interliner can therefore be applied first and then cut, or the interliner can first be cut into narrower strips and then applied to the adhesive tapes. The interliner is also preferably cut using a shear cut.For this purpose, it is possible to use an interliner cutting device with pairs of circular knives, in which the upper knives are designed as self-springing circular knives. However, since the interliner is normally cut to a width of at least 4 mm, conventional circular knives with a knife holder and tension spring can also be used.

[0033] If the cut adhesive tapes are to be laminated with an interliner in the form of a wide web, spaced next to one another, the cut adhesive tapes are combined in a further section of the converting device and fed next to one another again, but spaced from one another by the overlapping portion of the interliner width. Laminating preferably takes place in a laminating device in which the interliner is provided in the form of interliner rolls on an interliner unwinder. From the laminating device, the adhesive tapes laminated with the interliner are fed into the interliner cutting device, where the interliners are cut by the circular blade pairs, as described above, thus producing individual interliner-laminated adhesive tapes. The cut edges of the interliner can be wound onto edge strip winders.

[0034] The interliner-laminated adhesive tapes are then fed over additional rollers and wound onto cores mounted on reel winders. This creates reels of wound adhesive tape.

[0035] In an advantageous embodiment, the interliner is coated on at least one side with an adhesion-reducing layer. This layer can, in particular, be a silicone layer. Particularly preferably, the interliner is coated on both sides with an adhesion-reducing layer, in particular a silicone layer. If both sides are coated, the adhesion-reducing layers preferably have different release forces. For example, the side facing the next layer can have a higher release force so that it can be removed more easily. For other products, it can be advantageous if the side facing the next layer has a lower release force.

[0036] When winding the adhesive tape onto a spool core, the adjacent adhesive tape tracks are preferably spaced apart by a laying distance. The laying distance between two adhesive tape tracks is particularly preferably 0.5 to 2 mm, particularly preferably 1 to 1.5 mm.

[0037] The interliner overhang should be at least the thickness of the adhesive tape on both sides in order to cover the entire side of the adhesive tape. However, it has been shown that particularly good and even winding of the spool can be achieved if the interliner overhangs more than just the thickness of the adhesive tape. The amount by which the interliner overhangs depends on the properties / dimensions of the adhesive tape, such as the adhesive tape thickness, and the winding parameters, such as the installation spacing. It is particularly preferred if the interliner overhangs by at least 2 mm on each side, and preferably exactly 2 mm. This prevents the adhesive tape and / or interliner of a subsequent layer from slipping between the adhesive tape tracks of a layer below.

[0038] In a further preferred embodiment, the winding onto the spool core is carried out in such a way that each successive wound layer of adhesive tape has a smaller width than the layer below it. This results in a conical structure of the adhesive tape on the spool, starting from the core. The difference in the width of one layer compared to the layer below it can be very small, for example, only 1 mm or 2 mm on each side. Larger or variable differences in the width of the layers are also possible. Such a conical structure results in greater stability of the wound spool.

[0039] The converting method according to the invention is designed as an endless process. Once the tape on one adhesive tape master roll is used up, the next master roll is spliced ​​directly to the end of the previous master roll. In this way, the converting device can be provided with the ability to continue running without the need to shut down and restart the device when changing the master roll. The splicing preferably takes place in the initial area of ​​the converting device during the feeding of the master adhesive tape. In this way, it is possible to provide reels with a large length of adhesive tape, up to 100 m, but also with lengths of up to 400 or 500 m, or even several thousand meters.

[0040] The present invention also relates to a spooled multilayer adhesive tape obtained by the inventive assembly method, and to a spool produced in this way. Such a spool typically comprises a core onto which the tape is wound.

[0041] The multilayer adhesive tape obtained by the inventive method for cutting a ribbon-shaped multilayer mother adhesive tape, as well as the spooled multilayer adhesive tape, can be used for any application requiring particularly narrow adhesive tapes. A particularly preferred area of ​​application is the bonding of displays. The edges of such displays are becoming increasingly thinner; accordingly, the area available for bonding is becoming increasingly narrow. If bonding using an adhesive tape is desired, which is clearly preferred over bonding using liquid adhesive, correspondingly narrow adhesive tapes are required. The present invention makes it possible for the first time to produce such narrow adhesive tapes using a web-cutting process. This allows for the provision of long lengths of adhesive tape, and also avoids the waste generated with conventional punching processes.By packaging the thin adhesive tape cut in this way onto reels, long lengths of tape can be made available. In a preferred embodiment, a single reel is sufficient to cover the tape needs of one industrial worker for a single shift. However, reels with even longer or, conversely, shorter lengths of tape are also possible.

[0042] The dependent claims are directed to the aforementioned and other expedient and advantageous embodiments of the invention. Only particularly expedient and advantageous embodiments and possibilities are described in more detail in the following description of the exemplary embodiments illustrated in the schematic drawings. Each individual or detailed design described within an exemplary embodiment is to be understood as a structurally independent detailed example of other embodiments and designs falling within the scope of the invention that are not described or not fully described.

[0043] Fig. 1 shows an embodiment of a finishing device for carrying out the method according to the invention for an adhesive tape with interliner;

[0044] Fig. 2 shows a self-springing circular knife as used in the method according to the invention.

[0045] Fig. 1 shows a converting device 100 for converting a multi-layer master adhesive tape 1. In a first section I of the converting device 100, the master adhesive tape 1 is fed from the master roll 10 via a master roll unwinder 11. The first section also contains a splicing table 12. On this splicing table, the transition from the end of the master adhesive tape 1 of one master roll to the beginning of the master adhesive tape 1 of a new master roll is created by means of shoulder splicing. The master adhesive tape 1 is then guided over an edge positioning device 13, which ensures a continuously constant distance between the rear edge of the material web and the system wall.

[0046] The master adhesive tape 1 is then guided into a second section II of the converting device 100, in which the cutting device 20 is arranged. The cutting device 20 is a shear-cutting device with pairs of circular knives 21, 22, namely upper knives 21 and associated lower knives 22. The upper knives 21 are designed as self-springing circular knives. A lubricating roller 23 is also arranged in the cutting device 20, with which the upper knives of the cutting device are lubricated. The master adhesive tape 1 is cut into narrower adhesive tapes 1a by the pairs of circular knives 21, 22. The adhesive tapes are cut to a width of <4 mm, for example 2 mm. The second section also contains a master roll winder 24, on which any remaining material web 26 of the master roll 10 is wound up. If the entire master tape 1 is cut into narrower tapes 1a, this master roll winder 24 is not required.The cut adhesive tapes 1 a are separated from each other and guided via rollers 25 arranged at different heights.

[0047] The cut adhesive tapes 1a are fed into a third section III of the converting device 100. There, the cut adhesive tapes 1a are combined and fed next to one another again, but spaced from one another by the overlapping portion of the interliner width. In this third section, the adjacently arranged, spaced-apart adhesive tapes 1a are laminated with a siliconized interliner 3. The interliner 3 is provided in the form of interliner rolls 31 on an interliner unwinder 32. Laminating takes place at laminating device 33. From the laminating device 33, the adhesive tapes 1a laminated with the interliner 3 are fed into the interliner cutting device 34. There, the interliners 3 are cut by pairs of circular knives 35, 36, so that individual adhesive tapes 1a laminated with interliner 3 are produced.

[0048] In a fourth section IV of the converting device 100, the cut edges of the interliner 3 are wound onto edge strip winders 40. The adhesive tapes 1a are fed via further rolls to a fifth section of the converting device 100. In this fifth section V, the adhesive tapes 1a laminated with interliner 3 are wound onto spools 50 located on spool winders 51. Winding occurs such that the adjacent tracks of adhesive tape 1a are preferably spaced apart from one another by a laying distance of 1 mm. Spools 50 with wound-up adhesive tape 1a are obtained. Section V of Fig. 1 also shows strip interliner rolls 52. These are not used in the embodiment shown in Fig. 1, since in the embodiment shown in Fig. 1, the interliner 3 is applied from the interliner roll 31 as a wide web onto the adjacently spaced-apart adhesive tapes 1a.However, if the interliner is not laminated as a wide web, but the adhesive tapes 1 a are to be provided with already cut individual interliner webs, these already cut interliner strips could be fed from the strip interliner rolls 52.

[0049] Fig. 2 shows an embodiment of a self-springing circular knife, as used as the upper knife 21 for the method according to the invention.

[0050] The self-springing circular knife 21 has a knife blade 210, a central opening 211 for holding the self-springing circular knife 21, and a circumferential knife edge 212. Incisions 213 extend through the material thickness of the self-springing circular knife 21 in the circumferential direction of the circular knife 21. These incisions form spring arms 214 between the knife edge 212 and the incisions 213.

Claims

Patent claims 1. Method for cutting a band-shaped multi-layer mother adhesive tape (1 ), comprising at least one carrier and / or at least one liner and at least one adhesive layer, by means of a shear cut with at least two upper blades (21 ) and at least two lower blades (22) into at least one adhesive tape (1 a), characterized in that self-springing circular blades are used as the upper blade (21 ).

2. Method according to claim 1, characterized in that the upper knives (21) designed as self-springing circular knives each have a knife blade (210), a central opening (211) for holding the self-springing circular knives (21) and a circumferential knife edge (212) and that incisions (213) extending in the circumferential direction of the self-springing circular knives (21) and reaching through the material thickness of the self-springing circular knives (21) are formed in the self-springing circular knives (21) to form spring arms (214) formed between the knife edge (212) and the incisions (213).

3. Method according to claim 2, characterized in that the incisions (213) are designed as linear separating cuts and / or as slot-shaped openings in the respective knife blade (210).

4. Method according to claim 1, characterized in that in the knife blade (210) of the self-springing circular knives (21) areas with a lower material thickness are provided than in the rest of the knife blade (210).

5. Method according to one of claims 1 to 4, characterized in that the upper blades (21) are lubricated.

6. Method according to one of claims 1 to 5, characterized in that when starting the method, a siliconized carrier is applied to the adhesive side of the mother adhesive tape (1) for a length corresponding to the first revolution of the upper blade (21).

7. Method according to one of claims 1 to 6, characterized in that at least one of the following parameters is realized: i) web tension of 200 to 400 cN / cm ii) pre-travel of 0 to 5% iii) web speed of 5 to 75 m / min iv) web angle of -15° to 80° 8. Multilayer adhesive tape (1 a) obtainable by a process according to at least one of claims 1 to 7.

9. Multi-layer adhesive tape (1 a) according to claim 8, characterized in that the adhesive tape (1 a) has a width of less than 4 mm, in particular of 3 mm or less, preferably of 2 mm or less, particularly preferably of 1 to 4 mm.

10. Multi-layer adhesive tape (1 a) according to claim 8 or 9, characterized in that the adhesive tape (1 a) comprises at least one pressure-sensitive adhesive layer.

11. A manufacturing method for producing a spooled, band-shaped, multi-layer adhesive tape (1a) in an adhesive tape manufacturing device (100), comprising the steps of: a) feeding a wide, multi-layer mother adhesive tape (1), the mother adhesive tape (1) comprising at least one band-shaped carrier and / or at least one liner, each of which is provided with an adhesive on at least one side, from a mother roll (10); b) cutting the multi-layer mother adhesive tape (1) into at least one narrower adhesive tape (1a) using the method for cutting a multi-layer mother adhesive tape (1) according to one of claims 1 to 7; c) winding the at least one narrower adhesive tape (1a) thus obtained onto a spool core (50) to obtain the spooled, band-shaped, multi-layer adhesive tape (1a).

12. Assembly method according to claim 1 1, characterized in that between step b) and step c) a further step of applying an interliner (3) to the adhesive mass takes place, wherein the interliner (3) has a greater width than the adhesive tape (1 a) and is applied in such a way that the interliner (3) projects on both sides of the adhesive tape (1 a).

13. Method according to claim 11 or 12, characterized in that the winding onto the spool core (50) is carried out in such a way that each next wound layer of adhesive tape (1 a) has a smaller width than the layer below it.

14. Spooled multilayer adhesive tape (1 a) obtainable by the process according to one of claims 11 to 13.

15. Use of the multilayer adhesive tape (1a) according to one of claims 8 to 10 or of the spooled multilayer adhesive tape according to claim 14 for bonding displays.

Images