WO2017207225A1

WO2017207225A1 - Method and device for producing an adhesive tape

Info

Publication number: WO2017207225A1
Application number: PCT/EP2017/060984
Authority: WO
Inventors: Timo Leermann; René RAMBUSCH; Kay RUHNAU
Original assignee: Certoplast Technische Klebebänder Gmbh
Priority date: 2016-06-01
Filing date: 2017-05-09
Publication date: 2017-12-07
Also published as: DE102016110149A1

Abstract

The invention relates to a method for producing an adhesive tape. In said method, first a textile carrier tape material (1) is produced and fed in the longitudinal direction (L). The carrier tape material (1) is coated in at least some regions on at least one side with an adhesive (4). In addition, the carrier tape material (1) is divided in a separation device (7, 8) into individual adhesive tapes (2), each having at least one non-straight longitudinal edge (3a, 3b). According to the invention, the separation device (7, 8) operates without pressure. In a preferred embodiment, an ultrasonic and/or laser beam and/or water jet device is used as a separation device.

Description

Method and device for producing an adhesive tape

Description:

The invention relates to a method for producing an adhesive tape and in particular to a winding tape for bundling cables in automobiles with the following method steps: 1 .1) a textile carrier tape material is produced and fed in the longitudinal direction;

1 .2) the textile carrier tape material is coated at least on one side with an adhesive at least partially;

1 .3) the carrier tape material is assembled in a separator into individual adhesive tapes, each with at least one non-straight longitudinal edge, the steps 1 .2) and 1 .3) can also be run in reverse order. In this case, the carrier tape material in the separating device is assembled into the individual adhesive tapes, each with at least one non-straight longitudinal edge, and then the individual adhesive tapes or the individual carrier tapes are coated at least on one side with the adhesive, at least in certain areas.

In general, the carrier tape material is at least on one side with the adhesive at least partially according to the method step 1 .2) coated. Subsequently, the assembly takes place in the individual tapes using the separator. In this case, at least one not straight longitudinal edge is produced by means of the separating device in the respective adhesive tape.

In the generic state of the art according to DE 10 2014 105 609 A1, the production of a highly abrasion-resistant technical adhesive tape is described, which is equipped with a band-shaped double-layered carrier. In this case, at least one band edge or longitudinal edge of the adhesive tape is executed in the form of a pattern deviating from a straight line. This is done with the help of a separation process.

In detail, the known doctrine according to DE 10 2014 105 609 A1 uses a separating device that works with at least one zig-zag knife for producing the relevant longitudinal edge. Due to the selected zig-zag design of the longitudinal edge of the adhesive tape produced, overall the hand tearability or transverse tearability is to be improved or even achieved in the case of abrasion-resistant adhesive tapes. This can essentially be attributed to the fact that, as a result of the separation process with the zig-zag knives, outer warp threads located in the vicinity of the longitudinal edge are cut or at least torn, in the case of a textile carrier strip material made of a fabric material in the region of associated teeth. At the same time the weft threads are shortened to different lengths. In any case, should be improved by the targeted edge injury the edge tearability. It is also claimed that the tear strength is deliberately reduced. Finally, as a further advantage of the zig-zag edge trimming a positive influence on the breaking strength, elongation at break and tear propagation resistance of the known adhesive tape is explained.

In addition to the advantages described, however, the known method according to DE 10 2014 105 609 A1 also has disadvantages. Thus, with the help of the zig-zag knife described and intended for the edge injury of the respective adhesive tape, only very specific geometries can be attached to the

Realize longitudinal edge. As a result, a flexible adaptation to, for example, different widths of the adhesive tapes, different materials during the production of the textile carrier tape, etc. is not possible. In fact, such adaptation requires the use and use of another zig-zag knife with a different geometry. For example, one will tend to have to work or work with more pronounced teeth on the respective longitudinal edge of the tape, the greater the width and tear strength of the particular carrier tape material is designed to still ensure hand tearability.

In addition to the lack of flexibility in the production of the geometry of the edge injury such zig-zag knives are associated with the further disadvantage that the separation or cutting process between an upper and lower blade must be done. This results in an elastic or plastic deformation of the carrier tape material and this is at least partially displaced in the cutting direction and at right angles to the axis of movement. As a consequence thereof, a permanent deformation of the carrier tape material in the region of the cut edge or in the region of the non-straight longitudinal edge may occur. In addition, uncontrolled cracking is observed in such a cutting process. All this leads to the fact that the adhesive tape produced in this way not only has the inherently desirable edge damage to improve the hand tearability, but in itself positive mechanical properties such as tear resistance, abrasion resistance, etc. may suffer or in a more or less uncontrolled manner negative to be influenced. This is where the invention starts.

The invention is based on the technical problem of further developing such a method for the production of an adhesive tape so that the edge injury of the at least one non-longitudinal longitudinal edge of the adhesive tape under

Recourse to a flexible geometry can be produced and the carrier tape or adhesive tape is otherwise otherwise negatively affected in terms of its mechanical properties. Finally, the adhesive tape produced in this way should also have perfect cut edges and any buildup on the separator should be avoided.

To solve this technical problem is provided in a generic method within the scope of the invention that the separator operates without pressure. That is, the separating device operates in such a way that the carrier tape material in the region of the separating device is neither elastically nor plastically deformed. This results in a smooth and uniform cutting edge and consequently the longitudinal edge of the thus prepared adhesive tape and, for example, fraying or uncontrolled cracking is not observed. In addition, the pressure-free separating device ensures that any material to be cut does not adhere to the separating device.

According to an advantageous embodiment, the textile carrier tape material is produced as a woven tape (material) and / or nonwoven tape (material). The fabric tape material or fabric tape is advantageously a fabric tape which is produced from plastic threads or even natural threads. For example, the fabric tape may be made based on polyester, polypropylene, viscose or cotton threads. But there are also polyamide threads or even glass or carbon threads conceivable.

If the textile carrier belt material is designed as a nonwoven belt material, the recourse to, for example, a staple fiber fleece, filament fleece, meltblown fleece and spun fleece is recommended. In addition, the nonwoven may be mechanically, thermally or chemically solidified. In the mechanical consolidation of

individual fibers is usually worked with air or water jets. In addition, additional threads can be sewn. In addition, the nonwoven strip material can be solidified by hot stamping with structured rollers. Likewise, sewing nonwovens are encompassed by the invention, that is, a nonwoven strip material which has been sewn with a plurality of parallel running seams.

In the case of these textile carrier tape materials or fabrics or nonwovens which are advantageously used, the unpressurized work of the separating device according to the invention results overall in that the carrier tape material in question is not deformed by the same kind of cutting without pressure. Even frays are avoided. As a result, mechanical properties of the carrier strip material are specifically and only in the region of the cutting edge or cut edge of the non-straight longitudinal edge changed and not otherwise.

This means that, for example, the tear strength of the adhesive tape produced in this way is reduced in the longitudinal direction, but only by a maximum of 30% compared to a comparable carrier strip with a straight longitudinal edge. The tear strength is measured according to DIN EN 14410 on a material without edge injury or edge structuring. In any case, according to the invention, by means of the unpressurised cutting process with the aid of the separating device, the decrease in tear strength compared to the comparable carrier strip with a straight longitudinal edge can be set specifically to values of up to 30% less tear strength. This can be attributed to the fact that the unpressurized separating device produces a smooth and uniform cutting edge without fraying and without uncontrolled cracking in the cutting process.

Nevertheless, the structuring of the adhesive tape on the at least one non-straight longitudinal edge or the edge injury associated therewith in total ensures that the adhesive tape produced in this way is designed to be transversely tear-open or hand-tearable. That is, forces in the range of 10 N / cm are observed for the tearing. Details on this are described in DE 600 31 332 T2 of Scapa. In this case, the respective carrier tape or the carrier tape material typically has a surface area of about 50 to about 50 g / m ² . As a coating weight for the adhesive, the invention recommends a value of 20 g / m ² to 200 g / m ² .

The pressure-free separating device is constructed in detail so that it has at least one ultrasonic cutting device. Such an ultrasonic cutting device works with special blades or knives, which are also referred to as sonotrodes or Schneidsonotroden. The excitation of these blades or knives or the sonotrodes with ultrasonic frequencies in the typical frequency range of 20 to 40 kHz mechanical vibrations are generated in the cutting blade or sonotrode. As a result, the rapid vibration of the cutting blade or sonotrode ensures that the carrier tape material in question is cut without pressure. In addition, the carrier tape material is not deformed during the cutting process and also does not adhere to the blade. This creates a smooth and even cutting edge without fraying.

Another advantage is that ultrasonic cutting devices or the pressure-free separating device are generally moved in the transverse direction in comparison to the longitudinal direction of the carrier tape material and can also be moved. As a result, practically any desired geometries of the non-straight longitudinal edge can be produced. For example, the

Longitudinal edge with a regular non-straight course in the sense of sinusoidal, wavy or zigzag realized. This usually happens in such a way that the separating device is moved in the transverse direction in comparison with the carrier strip material fed in the longitudinal direction and passing through.

In principle, the separating device in question can of course be moved not only in the transverse direction but also in the longitudinal direction. In addition, it is possible that the carrier tape material is not only conveyed in the longitudinal direction, but in addition and at least in the region of the separating device is moved transversely or can be moved. As a rule, however, one will work so that the carrier tape material is conveyed in the longitudinal direction and the separator is moved in contrast in the transverse direction.

In this way, very different geometries of the edge structuring of the non-straight longitudinal edge of the adhesive tape can be implemented simply, quickly and flexibly. In fact, in the example case, the separating device or the ultrasonic cutting device in question not only provides for the described edge injury of the adhesive tape thus prepared, but overall ensures that the adhesive tape in question is cut out of the carrier tape material supplied in the longitudinal direction as a whole.

The ability to produce the edge injury with flexible geometry, not only any widths of the adhesive tape according to the invention can be cut out of the carrier tape material, but also the respective non-straight longitudinal edge can be adapted to the specific requirements. Thus, one tends to be at a high basis weight of the carrier tape material or the carrier tape made therefrom for the adhesive tape

work with pronounced edge structuring to still ensure hand tearability. The same applies to the case in which, for example, particularly strong warp threads are used in a fabric tape backing which otherwise, ie without edge damage, does not allow a hand tearability of the finished adhesive tape.

In fact, the non-straight longitudinal edge can be characterized with its sinusoidal, wave-shaped or even zigzag-shaped course such that the recesses produced in this way are bounded on the correspondingly structured longitudinal edge of the prefabricated adhesive tape by flanks on both sides and one foot of the recess. The larger the surface area of the recess or the recesses per unit length of the carrier tape or of the adhesive tape made up in this way is designed, the more the hand tearability tends to be positively influenced.

In addition, a so-called Fußtiefe for the hand tearability of course plays a special role. This foot depth is the distance of the foot of the recess from the straight longitudinal edge. The greater the depth of the foot, the sooner the hand tearability is positively influenced. Consequently, various parameters are available in order to be able to flexibly adapt the geometry of the edge structuring or edge injury of the non-linear longitudinal edge of the adhesive tape thus produced to the material and in particular the strength of the carrier tape of the adhesive tape. Such flexibility does not explicitly open the generic state of the art according to DE 10 2014 105 609 A1.

The same advantages and effects are observed when the separator is equipped with a laser beam cutter as an alternative or in addition to the ultrasonic cutter. In this case, the works

Separator not only without pressure, but even without contact. In this case, as the laser beam cutting device advantageously one can be used which generates heat energy in the region of the cutting surface with a CO2 laser and / or a YAG (yttrium, aluminum and garnet) laser and thus the separation of the carrier strip material taking into account each not straight Longitudinal edge causes. In fact, the two aforementioned lasers each operate in the infrared range with wavelengths greater than 1 μιτι. Thus, the output wavelength of a CO2 laser is 10.6 μιτι, while the wavelength of the YAG laser is settled at 1, 06 μιτι. In principle, however, it is also possible to use excimer lasers which emit UV light.

As a rule, however, one works with CO2 or YAG lasers because the textile carrier tape material absorbs the output wavelength thus produced more or less pronounced. The operation of the relevant infrared laser or the infrared laser beam device is based on the fact that heat energy is generated in the region of the cutting edge to be generated by the high energy input by means of the laser beam to the extent that the carrier tape material in question can be evaporated and immediately separated. In this context, it can additionally be ensured that the absorption of the infrared rays is increased by, for example, adding colorants. Since predominantly black colored carrier tape material is used for the production of the adhesive tape according to the invention, a particularly high absorption of the infrared radiation is to be expected, in particular that emitted by a VAG laser. In any case, a separating device equipped with a laser beam cutting device is capable of being moved in the transverse and longitudinal directions. That is, the same possibilities and advantages as with an ultrasonic cutter are observed in this connection.

It also applies to laser beam cutting devices that not straight longitudinal edge produced in this way is not only smooth and uniform, but in an example used fabric as a carrier tape material, the individual fabric threads in the non-straight longitudinal edge are additionally fused together, so that an uncontrolled Cracking certainly can not occur. Although the use of an ultrasonic cutting device or a laser steel cutting device for the assembly of adhesive tapes of carrier tape material is basically known from DE 20 2015 103 713 U1 of the Applicant. However, here you work with straight long edges and not with a border structuring.

Another conceivable alternative in the realization of the separating device provides that, in a modification or in addition to the ultrasonic cutting device or laser beam cutting device, a water jet cutting device is used in the separating device. In such a water jet cutting device, the carrier tape material to be separated is passed between at least one nozzle and an opposite water jet collecting device with a collecting opening for the water jet generated by the nozzle. In this case, too, the separating device or water jet device can be displaced without problems in the transverse direction in comparison to the carrier strip conveyed in the longitudinal direction, so that in turn a structuring of the longitudinal edge succeeds in a flexible manner. Such a water-jet cutting device will typically be used in textile carrier tape materials which are hydrophobic or have a corresponding hydrophobic finish in the form of, for example, a water-repellent coating. Basically, of course, this carrier tape materials can be cut, which absorb all or part of the water of the water jet cutting device. Then, however, a subsequent drying process is required.

The adhesive for the adhesive tape according to the invention can be applied to the carrier tape material or the carrier tape as one or more adhesive strips or adhesive strips. Of course, a full-surface coating of the carrier tape material or the carrier tape is within the scope of the invention. Typically, the adhesive is a hot melt adhesive which is applied, for example by means of one or more nozzles in the molten state, to the continuous carrier belt material and solidifies during the further transport of the carrier belt material. In principle, however, the adhesive in question can also be applied after the separating device to the respective carrier tapes for packaging the respective adhesive tape. Of course, it is also within the scope of the invention to use other adhesives, for example dispersion adhesive. - The invention is also a device which is particularly suitable for carrying out the method described and described in claim 10.

As a result, a method and an apparatus for producing an adhesive tape are described with the aid of which an adhesive tape and in particular winding tape for bundling cables in automobiles can be produced, which has particular strength and abrasion resistance, but at the same time is also designed to be tearable. In fact, the hand tearability is either basically provided or facilitated by the at least one non-longitudinal edge of the particular adhesive tape. For the production of the non-straight longitudinal edge, the invention proposes a special separation device which operates without pressure. As a result, the carrier tape material or the carrier tape is neither deformed in the region of the non-straight longitudinal edge produced in this way, nor are uncontrolled cracks, fraying, etc. observed in this region, as is possible in the prior art and can not be ruled out. Here are the main benefits.

Inn Below, the invention will be explained in more detail with reference to a drawing showing only one embodiment; show it:

1 shows the device according to the invention for producing an adhesive tape schematically,

2 is an enlarged detail of FIG .. 1

Fig. 3 which by means of the device according to FIGS. 1 and 2 produced

Tape in supervision and

4 shows a detailed view of the adhesive tape according to FIG. 3.

FIG. 1 shows a device with the aid of which one or more adhesive tapes 2 are produced on the output side from a textile carrier tape material 1. The respective adhesive tape 2 produced in this way is shown pictorially in FIGS. 3 and 4. The textile carrier tape material 1 is present as a flat textile web and is cut in the longitudinal direction L into a plurality of the adhesive tapes 2, as will be explained in detail below.

The adhesive tape 2 has in its basic structure a carrier or a carrier tape 3. On the carrier respectively the carrier tape 3, an adhesive 4 is applied. In the context of the embodiment according to FIG. 3, the adhesive 4 is designed as an adhesive strip, which applies only by way of example. Because in principle can be achieved with the help of the device to be described below also a full-surface coating of the carrier or carrier tape 3.

The textile carrier tape material 1 is first produced once in a production / supply unit 5 and fed to the apparatus shown in FIG. 1 in the longitudinal direction L. In the exemplary embodiment, the manufacturing / supply unit 5 is a storage unit 5, starting from which the textile carrier tape material 1 is conveyed in the longitudinal direction L. Subsequently, the textile carrier tape material 1 is cut after unwinding from the storage unit 5 into the individual adhesive tapes 2 or the individual adhesive tapes 2 are assembled. Starting from the storage unit 5, the textile carrier tape material 1 is first supplied to a coating unit 6. This can be done via one or more deflection rollers shown in FIG. 1, over which the textile carrier tape material 1 is guided and then reaches the coating unit 6. The coating unit 6 is one or more nozzles 6, with the aid of which the adhesive 4 is applied either over the entire surface or as one or more adhesive strips to the carrier tape material 1.

The textile carrier tape material 1 coated in this way is subsequently finished in a separating device 7, 8 in the individual adhesive tapes 2. In this case, the separating device 7, 8 in the separation process generates at least one non-straight longitudinal edge 3a, 3b on the associated carrier or carrier tape 3 of the adhesive tape 2. This can be seen in particular in FIGS. 3 and 4. In fact, the respective non-straight longitudinal edge 3a 3b as shown in FIG. 4 and in the exemplary embodiment sinusoid-shaped or wave-shaped and has a regular course.

It can be seen in Fig. 4 dash-dotted lines a straight course of the associated longitudinal edge 3a, 3b, while pulled through the actual not

straight longitudinal edge 3a, 3b is shown. Due to the non-straight wavy or sinusoidal curve-like course of the longitudinal edge 3a, 3b each recesses 9 are formed opposite the dashed straight course of the longitudinal edge 3a, 3b. These respective recesses 9 are bounded by respective flanks 9a, 9b and a foot 9c between the two flanks 9a, 9b. In FIG. 4, a so-called foot depth T can be seen as the distance of the foot 9c of the recess 9 from the straight course of the respective longitudinal edge 3a, 3b. With the aid of the separating device 7, 8 to be described in detail below, both longitudinal edges 3a, 3b can be equipped with the corresponding recesses 9 during the manufacture or assembly of the adhesive tape 2, resulting in a structuring of the respective longitudinal edges 3a, 3b. But it is also possible that only one of the two longitudinal edges 3a, 3b is structured, while the other longitudinal edge 3a, 3b is straight.

Of particular importance is the fact that the separating device 7, 8 in the context of the embodiment and according to the invention operates without pressure, that is, the textile carrier tape material 1 by means of the separator 7, 8 is neither elastically nor plastically deformed. As a result, fraying, cracking etc. in the region of the respective recess 9 are not observed in this context.

In the context of the described example, the separating device 7, 8 an ultrasonic cutting device 7, 8, which is composed according to the illustration of FIG. 1 from a trained as a sound meter 7 cutting blade on the one hand and an opposite anvil 8 on the other. The fact that the cutting blade or sound meter 7 is excited with ultrasonic vibrations above 20 kHz, learns that between the

Cutting knife 7 and the anvil 8, guided through textile carrier tape material 1 a non-pressurized loading, which corresponds to a smooth and uniform cutting edge, as seen in Figs. 3 and 4. As a result of this smooth and uniform cutting edge, the respective non-straight longitudinal edges 3a, 3b of the adhesive tape 2 set.

The wave-shaped or sinusoidal curve-like course of the relevant longitudinal edge 3a, 3b is generated or made available in the exemplary embodiment by the cutting blades or sound meters 7 and possibly also the anvil or sound anvil 8 being moved in the transverse direction in comparison to the longitudinal direction L. For this purpose, the individual cutting blades or sound meters 7 are acted upon by means of an adjusting device 10, which ensures the process of the cutting blade or sound meter 7 in the transverse direction. In principle, instead of the illustrated ultrasonic cutting direction 7, 8, it is also possible to work with a laser or a laser beam cutting device, which is likewise moved transversely to the longitudinal direction L with the aid of the adjusting device 10, around the one or two non-straight longitudinal edges 3a, 3b during the assembly of the adhesive tape 2. In this way, recesses 9 of virtually any size can be realized. The shape and orientation of the respective flanks 9a, 9b can also be adjusted variably in the longitudinal direction L depending on the speed of the relevant cutting blade or sound meter 7 in the transverse direction compared to the speed of the textile carrier strip material 1. A change in the stroke of the transverse movement results in a variation of the foot depth T.

Claims

Patent claims:

1. Process for producing an adhesive tape (2), in particular a wrapping tape for bundling cables in automobiles, with the following process steps: 1.1) a textile carrier tape material (1) is produced and fed in the longitudinal direction (L);

1.2) the textile carrier tape material (1) is coated at least in areas on at least one side with an adhesive (4);

1.3) the textile carrier tape material (1) is assembled in a separating device (7, 8) into individual adhesive tapes (2), each with at least one non-straight longitudinal edge (3a, 3b), with steps 1.2) and 1.3) also running in reverse order can be, characterized in that the separating device (7, 8) works without pressure.

2. The method according to claim 1, characterized in that the textile carrier tape material (1) is produced as a fabric tape and/or non-woven tape.

3. The method according to claim 1 or 2, characterized in that the separating device (7, 8) has at least one ultrasonic cutting device (7, 8) and / or a laser beam cutting device and / or a water jet cutting device. 2

4. The method according to any one of claims 1 to 3, characterized in that the separating device (7, 8) is moved in the transverse direction compared to the carrier tape material (1) supplied in the longitudinal direction (L) in order to move the at least one non-straight longitudinal edge (3a, 3b) of the adhesive tape (2).

5. Method according to one of claims 1 to 4, characterized in that the separating device (7, 8) is moved in the transverse and longitudinal directions (L).

6. The method according to one of claims 1 to 5, characterized in that the non-straight longitudinal edge (3a, 3b) is produced with a regular course, for example sinusoidal, wave-shaped, zigzag-shaped, etc.

7. The method according to one of claims 1 to 6, characterized in that the textile carrier tape material (1) is additionally moved transversely at least in the area of the separating device (7, 8).

8. The method according to any one of claims 1 to 7, characterized in that the adhesive (4) is applied as one or more adhesive strips or over the entire surface to the carrier tape (3) of the adhesive tape (2) produced.

9. Method according to one of claims 1 to 8, characterized in that the separating device (7, 8) is acted upon in the transverse direction with the aid of an adjusting element (10).

10. Device for producing an adhesive tape, in particular for carrying out the method according to one of claims 1 to 9, with a production/feeding unit (5) for a textile carrier tape material (1), further with a coating unit (6) for adhesive ( 4) for at least one-sided coating of the carrier tape material (1), and with a separating device (7, 8) for assembly 3 positioning individual adhesive tapes (2) with at least one non-straight _longitudinal edge (3a, 3b), characterized in that the separating device (7, 8) works without pressure.