COATING DEVICE AND COATING METHOD

Description

[0001] The application relates to a coating device and a coating method. More specifically, the application relates to a coating device and method for applying plastic material to a carrier web in precise register.

[0002] A device and method for applying polymer patches to a substrate are known from the prior art (EP 3 493 300 A1). However, this prior art only describes the precise registration application at a single location on the substrate using a structured roller.

[0003] Furthermore, US Pat. No. 4,732,800 A discloses a coating device for the accurate registration of plastic material onto a carrier web, comprising a first coating roller with a first cavity and a downstream second coating roller with a second cavity. The first and second coating rollers can each be filled with plastic material via at least one nozzle. A stripping device strips the coating rollers. Each coating roller interacts with a counter-roller and coats one side of the carrier web. The counter-roller of the second coating rollers has a counter-cavity corresponding to the first cavity.

[0004] From EP 2 351 618 A1 a manufacturing machine for producing a wrapping paper web with a coating device at a coating position defined in a transport path of the web is known.

[0005] From US 2004 / 134596 A1 a method for printing objects with specific adhesives using a specific transfer tool and / or a specific adhesive is known.

[0006] The object of the present invention is to overcome the disadvantages of the prior art and to provide a device and a method by means of which a user is able to carry out a simple and precisely registered coating of a carrier web. Within the scope of this application, "precise register" means that, analogous to the nomenclature in the printing industry, coated areas of a front and back of a medium to be coated or coated (e.g., carrier web) are / are applied congruently or with greater registration accuracy. The assignment of which areas to which areas should be precisely registered is freely selectable. Partial areas can also be applied in precise register with one another (intersection of the areas).

[0007] This object is achieved by a device and a method according to the claims.

[0008] According to one aspect of the present invention, a coating device for the accurate registration application of plastic material to a carrier web comprises a first coating roller and a downstream second coating roller. The first coating roller has at least one first cavity, which can be filled with plastic material by means of at least one first nozzle. The second coating roller has at least one second cavity, which can be filled with plastic material by means of at least one second nozzle. A first stripping device strips the first coating roller and a second stripping device strips the second coating roller. The first coating roller interacts with a first counter roller and the second coating roller interacts with a second counter roller. The second counter roller comprises at least one counter cavity corresponding to the at least one first cavity.Furthermore, the coating device comprises at least one carrier web positioning device and at least one area detection device.

[0009] The carrier web is the medium to be coated by the coating device and can be, for example, an endless belt of film. The carrier web can comprise metal and / or plastic. Furthermore, the carrier web can also be understood as individual sections of the medium, which are individually fed through the coating device, placed on a conveyor belt, or connected to form a belt by connectors. The carrier web has a first carrier web side and a second carrier web side.

[0010] The second coating roller is arranged downstream of the first coating roller, meaning that in the processing direction of the coating device or in the direction of passage of the carrier web through the coating device, the second coating roller is arranged downstream of the first coating roller. During operation of the coating device, the carrier web is conveyed between the first coating roller and the first counter roller and then between the second coating roller and the second counter roller (processing direction).

[0011] The stripping device strips excess plastic material from the respective cavity. The stripped material can be collected, optionally processed, and reused to fill the cavity(ies).

[0012] The second counter-roller has at least one counter-cavity which corresponds to the first cavity, i.e. has at least substantially the same or a larger shape and substantially the same position as the first cavity. This means that during operation of the coating device, a first region of plastic material which has been applied to the carrier material by the at least one first cavity can be received by the second counter-roller or by the counter-cavity formed therein and thus cannot be deformed (e.g. deformed or squeezed) by the second counter-roller. Through the at least one counter-cavity, the second carrier web side of the carrier web or of the carrier material can be coated with plastic material in a second region by the second coating roller by means of the at least one second cavity. Furthermore, the two regions can thus be applied to the carrier web in precise register.The two opposing regions on the two sides of the carrier web can overlap only partially, as desired and / or required, or they can be located exactly one above the other. The dimensions of the at least one counter cavity can correspond to the dimensions of the at least one first cavity, but can also be larger. The dimensions of the at least one counter cavity depend on a variety of factors, e.g., the plastic material, the material of the carrier web, the speed at which the carrier web travels through the coating device, temperature, etc.

[0013] The carrier web positioning device is intended and suitable for positioning the position of the carrier web in the coating device relative to at least one of the coating rollers and / or relative to at least one of the counter rollers. Alternatively or additionally, the carrier web positioning device can also be intended and suitable for positioning the position of at least one of the coating rollers and / or at least one of the counter rollers relative to the carrier web.

[0014] The area detection device detects the position of an area of ​​plastic material on the first carrier web side that is coated by the at least one first cavity. The area detection unit can determine the position of the first coated area on the first carrier web side. The carrier web positioning device can be controlled accordingly based on the detected information such that the second area on the second carrier web side can be applied through the at least one second cavity in precise registration with the first area. Furthermore, the carrier web positioning device can position the carrier web accordingly based on information from the area detection device such that the at least one counter-cavity coincides exactly or at least largely exactly with the first area and thus the first area is not damaged by the second counter-roller.This can be advantageous because it can increase the quality of the product produced by the device.

[0015] Any type of thermoplastic can be used as the plastic material. It doesn't matter whether it's unmodified, organic, or mineral-filled. However, the plastic material can also be highly filled, meaning it contains at least 50% solids or fillers by weight.

[0016] The device can have the advantage that a carrier web can be coated on both sides with at least two areas of plastic material in register, and this in an economical, rapid and high-quality manner.

[0017] In a device according to a further aspect of the present invention, at least one inner surface of at least one of the cavities has a structure. The structure can, for example, influence the detachment or retention of the plastic material from the cavity. The region of plastic material on the carrier web can also be given a corresponding structure by the structure of the at least one inner surface of the cavity. This can be advantageous because the structure can positively influence the properties of the product and / or production process.

[0018] In a device according to a further aspect of the present invention, at least one inner surface of at least one of the cavities has a coating. The coating can, for example, reduce or prevent the detachment or adhesion of the plastic material or influence the surface roughness of the plastic-coated area. This can be advantageous because the coating can positively influence the properties of the product and / or production process.

[0019] A device according to a further aspect of the present invention further comprises a thickness measurement with respect to a filling or the degree of filling of the at least one first cavity and / or the at least one second cavity. In other words, the thickness measurement measures the filling of the at least one first and / or second cavity. This can be advantageous because it allows the filling of the cavity(ies) by the respective nozzles to be controlled in a targeted manner and, for example, the amount of plastic material to be stripped off by the respective stripping device can be kept as low as possible, but at the same time, complete or sufficient filling of the cavity(ies) can be ensured.

[0020] In a device according to a further aspect of the present invention, the carrier web positioning device comprises at least one of a displacement device for the first and / or second coating roller, or at least one carrier web moving device. The displacement device can move the respective coating roller parallel to its axis of rotation, in particular in or against the processing direction. The carrier web moving device can move the carrier web on its path through the device. This can be achieved, for example, by means of register rollers, rollers on bogies, or rotatable guide rollers, each of which acts on the carrier web. This can have the advantage that a suitable type of influencing the run of the carrier web through the machine can be selected for each carrier web material.For thin films, it may be advantageous to adjust the coating roller(s), as this minimizes mechanical impact on the carrier web.

[0021] In a device according to a further aspect of the present invention, the area detection device comprises at least one of a mechanical sensor, an optical sensor, or a coding on the first and / or second coating roller. A mechanical sensor can be, for example, a limit switch or contact switch. An optical sensor can be a camera or a camera system, a backlight sensor, or a laser measuring system. A coding can be attached, for example, to the front side of at least one of the coating rollers. The coding can contain the angle of rotation and thus, if the shape of the coating roller is known, also the position of the cavity and thus of the coated area as information. This can be advantageous because it allows the coated areas to be detected more precisely.

[0022] In a device according to a further aspect of the present invention, the area detection device detects the position of at least one edge of a first area of ​​plastic material coated by the at least one first cavity on the first side of the carrier web and / or at least one edge of the carrier web. This can be advantageous because, on the one hand, the edges serve as references and are at least partly decisive for the quality of the manufactured product. Furthermore, the edges can be detected more easily and reliably, if necessary, thus improving quality.

[0023] A device according to a further aspect of the present invention comprises a dispenser unit for applying at least one film strip. The film strip can be used, for example, to conduct electrical current. This can be advantageous because it allows high-quality functional products to be produced using the device. For example, a dispenser unit can be arranged before the first pair of rollers, between the first and second pairs of rollers, or after the second pair of rollers.

[0024] In a device according to a further aspect of the present invention, the at least one film strip is applied by the dispensing unit to the carrier web along at least one edge of a region of plastic material coated by the at least one first cavity and / or the at least one second cavity. This can be advantageous because it allows for the production of functionally high-quality products using the device. The region detection device and the carrier web positioning device can be used to precisely position a film strip along one of the edges.

[0025] A device according to a further aspect of the present invention further comprises at least one plasticizing unit, which is arranged upstream of the at least one first nozzle and / or the at least one second nozzle. The plasticizing unit can comprise at least one of an extruder, a melt pump, or a piston accumulator. If the same plastic material is to be introduced into the cavities using both nozzles, it may be sufficient to provide a single plasticizing unit for this purpose. Depending on the requirements and system size, it can also be advantageous if each nozzle or each coating roller is assigned its own plasticizing unit. This can be advantageous for filling the cavities of the at least one first and at least one second coating roller with plastic.

[0026] In a device according to a further aspect of the present invention, the first and / or second stripping device comprises at least one of a doctor blade or a squeegee roller. This can be advantageous because excess plastic material can be easily and reliably removed from the coating roller(s). It may be expedient to temperature-control the stripping device(s) to promote clean stripping of the excess material from the roller. Temperature control of the stripping device can be understood as either heating or cooling, depending on the material used and the process.

[0027] In a device according to a further aspect of the present invention, the at least one first nozzle and / or the at least one second nozzle is / are adjustable. The adjustability can relate to the size of the outlet cross-section and / or the shape of the outlet cross-section of the nozzle. This can be advantageous because it allows the filling quantity and / or speed of the cavity(ies) to be specifically influenced.

[0028] A device according to a further aspect of the present invention further comprises at least one cleaning unit for cleaning the carrier web, wherein the cleaning unit is intended and suitable for cleaning at least one side of the carrier web. The cleaning can be carried out by at least one of mechanical, pneumatic, chemical or physical methods, such as brushes, and / or the use of cleaning agents. Advantageously, a cleaning unit can be positioned upstream of the first coating roller, viewed in the processing direction. This can be advantageous because it allows the carrier web to be optimally prepared for coating, which can have a positive effect on the quality of the resulting product.

[0029] A device according to a further aspect of the present invention further comprises at least one roughening unit for roughening the carrier web, wherein the roughening unit is intended and suitable for roughening at least one side of the carrier web. The roughening can be carried out by at least one mechanical, chemical, or physical method, such as by means of brushes, sanding belts (optionally with suction), plasma, solvent misting, or heated embossing rollers. Advantageously, a roughening unit can be positioned upstream of the first coating roller, viewed in the processing direction. This can be advantageous because it allows the carrier web to be optimally prepared for coating, which can have a positive effect on the quality of the resulting product.

[0030] A device according to a further aspect of the present invention further comprises at least one smoothing unit for smoothing the carrier web, wherein the smoothing unit is provided and suitable for smoothing at least one side of the carrier web. The smoothing can be carried out by at least one mechanical, chemical, or physical method, such as by means of an ironing bar or by means of a tensioning device. Advantageously, a smoothing unit can be positioned upstream of the first coating roller, viewed in the processing direction. This can be advantageous because it allows the carrier web to be optimally prepared for coating, which can have a positive effect on the quality of the resulting product.

[0031] A device according to a further aspect of the present invention further comprises at least one processing unit for processing the carrier web, wherein the processing unit is provided and suitable for processing at least one side and / or one edge of the carrier web. The processing unit can, for example, process one or both edges of the carrier web or provide holes, beads, doubling, printing position markings, printing codes, applying conductive patches, or edge trimming with fixed blades or rotary knives on the carrier web. Advantageously, a processing unit can be positioned upstream of the first coating roller, viewed in the processing direction. Alternatively or additionally, a processing unit can also be arranged between the two pairs of rollers or even downstream of the second coating roller.This can be advantageous because it can increase the functionality of the products that can be manufactured using the device.

[0032] In a device according to a further aspect of the present invention, a mixer is arranged upstream of the at least one plasticizing unit. The mixer can be, for example, a twin- or multi-screw extruder. The mixer or mixing unit can be designed as a single- or multi-screw extruder and can also be used directly as a plasticizing unit. Furthermore, it is also possible to introduce static mixers according to the prior art into the melt stream in or downstream of the plasticizing unit. This can have the advantage that a homogeneous plastic mixture can be provided to the plasticizing unit.

[0033] In a device according to a further aspect of the present invention, the at least one plasticizing unit can be controlled via a throughput controller. This can have the advantage that the cavity(ies) can be filled with plastic material in a defined or controlled manner.

[0034] In a device according to a further aspect of the present invention, a feedblock is connected between the at least one plasticizing unit and the at least one first nozzle and / or the at least one second nozzle. This can be advantageous because it enables coextrusion. In a feedblock, plastic melts from several, at least two, plasticizing units are layered on top of one another, thus creating a multilayer material composite. The technology of coextrusion using a feedblock is known to those skilled in the art.

[0035] In a device according to a further aspect of the present invention, the at least one first nozzle and / or the at least one second nozzle is / are each designed as an application unit comprising a plurality of nozzles, wherein the plurality of nozzles apply the plastic material successively, next to one another, or in an overlapping manner to the first coating roller and / or the second coating roller. In other words, the application unit on the first and / or second coating roller consists of more than one nozzle and thus enables the application of successive, adjacent, or overlapping plastic webs. This can be advantageous because it allows better control of the filling of the cavity(ies). The technology of coextrusion by means of an application unit is basically known to those skilled in the art from the prior art.

[0036] In a device according to a further aspect of the present invention, the first and / or second nozzles are designed and suitable for introducing different plastic materials into the cavity. This can be advantageous because the areas coated by the cavity can thus comprise multiple plastic materials.

[0037] In a device according to a further aspect of the present invention, the at least one first and / or the at least one second cavity can have different levels, and each level can be assigned at least one nozzle and at least one stripping unit. Thus, a first level of the cavity can be filled with a plastic material and stripped before a second level is filled with a possibly different plastic material and stripped. Consequently, a multilayer region can be applied to the carrier web in a single operation using a single cavity in a single coating process.

[0038] Independently of this, the object of the invention is also achieved by a coating method for coating a carrier web with plastic material.

[0039] According to the method, at least one first cavity of a first coating roller is filled with plastic material by means of at least one first nozzle. The at least one first cavity is then stripped. The plastic material is applied to a first carrier web side in a first coated area. Furthermore, at least one second cavity of a second coating roller is filled with plastic material by means of at least one second nozzle, wherein the at least one second cavity is stripped. The position of the first coated area of ​​plastic material by the at least one first cavity is detected by an area detection device. The plastic material is applied to a second carrier web side in a second coated area.In this case, a second counter roll is controlled in such a way that at least one counter cavity of the second counter roll receives the first coated area when the plastic material is applied to the second carrier web side.

[0040] Regarding the advantages and possible special features or further developments of the coating process, reference is made to the preceding sections of the description to avoid unnecessary repetition. It should also be noted that the individual process steps and their chronological sequence do not necessarily have to be carried out in the order listed; a different chronological sequence is also possible. However, a successive and thus consecutive chronological sequence of the listed process steps is preferred.

[0041] For a better understanding of the device, it is explained in more detail using the following figures. The method is explained in more detail in the course of the device description.

[0042] They show in a highly simplified, schematic representation: Fig. 1 a rough schematic coating device in side view, Fig. 2 a detailed view of a coating roller, Fig. 3 a rough schematic coating device in plan view.

[0043] By way of introduction, it should be noted that in the variously described embodiments, identical parts are provided with identical reference symbols or component designations. The disclosures contained throughout the description can be applied analogously to identical parts with identical reference symbols or component designations. Furthermore, the positional information chosen in the description, such as top, bottom, side, etc., refers to the directly described and illustrated figure, and these positional information must be applied analogously to the new position in the event of a change in position.

[0044] The term "in particular" is understood below to mean that it may refer to a possible more specific embodiment or more detailed specification of an object or a method step, but does not necessarily have to represent a mandatory, preferred embodiment of the same or a mandatory procedure.

[0045] As used herein, the terms "comprising," "indicates," "having," "includes," "including," "contains," "containing," and any variations thereof are intended to cover non-exclusive inclusion.

[0046] Other terms used include "optional" and "alternative." This means that this process step or system component is generally present but can be used depending on the operating conditions, although this is not mandatory.

[0047] The Fig. 1 shows a rough schematic coating device 10 in a side view or represents a process sequence or a process flow diagram of a coating process for coating a carrier web 11 with plastic material.

[0048] The coating device 10 is provided for the accurate registration application of plastic material to a carrier web 11, in particular to a first carrier web side 11a of the carrier web 11 and / or to a second carrier web side 11b of the carrier web 11. The coating device 10 comprises a first coating roller 20 and a second coating roller 30 arranged downstream of the first coating roller 20. Terms such as "downstream", "subsequently" or "subsequently" refer to the processing direction or process flow direction of the coating device 10. The carrier web 11 is introduced into the coating device following the processing direction and is guided through it. The processing direction takes place in the Fig. 1 shown flow diagram from right to left and is indicated by an arrow for better understanding.

[0049] The first coating roller 20 has at least one first cavity 21 and can be filled with a plasticized plastic material by means of at least one first nozzle 22. The second coating roller 30 has at least one second cavity 31 and can be filled with a plasticized plastic material by means of at least one second nozzle 32. A first stripping device 23 strips the first coating roller 20, and a second stripping device 33 strips the second coating roller 30.

[0050] The first coating roller 20 cooperates with a first counter roller 40, with the carrier web 11 being guided between the first coating roller 20 and the first counter roller 40. The first carrier web side 11a, or in the example shown, the top side of the carrier web 11, faces the first coating roller 20. The first carrier web side 11a of the carrier web 11 is thus coated by the first coating roller 20.

[0051] The second coating roller 30 cooperates with a second counter roller 50, whereby the carrier web 11 is guided between the second coating roller 30 and the second counter roller 50. The second carrier web side 11b, or in the example shown, the underside of the carrier web 11, faces the second coating roller 30. The second carrier web side 11b of the carrier web 11 is thus coated by means of the second coating roller 30.

[0052] The second counter roll 50 comprises at least one counter cavity 51, which corresponds to at least one counter cavity 51 of the at least one first cavity 21.

[0053] In addition, the coating device 10 comprises at least one carrier web positioning device 60.

[0054] The Fig. 1The coating device 10 shown can be used in a coating process for coating a carrier web 11 with plastic material. In the process, a carrier web 11 is guided through a coating device 10 and preferably at least partially coated on both sides. For this purpose, the process initially provides for filling at least one first cavity 21 of a first coating roller 20 with a plastic material by means of at least one first nozzle 22. To remove excess plastic material, the at least one first cavity 21 is stripped by means of a first stripping device 23. By a rotational movement of the first coating roller 20, the plastic material is applied to a first carrier web side 11a of the carrier web 11, so that a first coated region 29 is created.Subsequently, at least one second cavity 31 of a subsequent, second coating roller 30 is filled with plastic material by means of at least one second nozzle 32. This second cavity 31 is also stripped by means of a second stripping device 33. By a rotational movement of the second coating roller 30, the plastic material is applied to a second carrier web side 11b of the carrier web 11, so that a second coated region 39 is created. In this case, a second counter-roller 50, which cooperates with the second coating roller 30, is controlled such that at least one counter-cavity 51 of the second counter-roller 50 receives the first coated region 29 when the plastic material is applied to the second carrier web side 11b.

[0055] At least one inner surface of at least one of the cavities 21, 31, 51 may have a structure. Fig. 1It is shown that the first coated region 29 and the second coated region 39 have a structure due to the structures of the cavities 21, 31, 51. It may also be the case that at least one inner surface of at least one of the cavities 21, 31, 51 has a coating so that the plastic material received in and dispensed from the cavities 21, 31, 51 does not adhere to the cavities 21, 31, 51.

[0056] The coating device 10 can further be designed with at least one area detection device 61, which detects the position of a first coated area 29 of plastic material through the at least one first cavity 21.

[0057] The coating device 10 can further comprise a thickness measurement (not shown in the figure) that measures the filling of the at least one first cavity 21 and / or the at least one second cavity 31. For example, a thickness measurement can be configured as a component of the area detection device 61. Alternatively, a thickness measurement can also be configured in the respective cavity 21, 31 or in the vicinity of the respective cavity 21, 31.

[0058] The carrier web positioning device 60 may comprise at least one displacement device 62 for displacing the first and / or second coating roller 20, 30, and / or at least one carrier web moving device 63 for moving the carrier web 11.

[0059] Furthermore, the area detection device 61 can comprise a mechanical sensor, an optical sensor, and / or a coding on the first and / or second coating roller 20, 30. The area detection device 61 can detect the position of at least one edge of the first coated area 29 and / or at least one edge of the carrier web 11.

[0060] Furthermore, the coating device 10 can comprise a dispenser unit (not shown in the figure because it is generally known in the art) for applying at least one film strip. The dispenser unit can be arranged at the beginning of the coating device 10, i.e., before the first roller pair 20, 40, between the roller pairs 20, 40 or 30, 50, or after the second roller pair 30, 50. The at least one film strip can be applied by the dispenser unit along at least one edge of the first and / or second coated region 29, 39 onto the carrier web 11.

[0061] It is also possible for the coating device 10 to comprise at least one plasticizing unit (not shown in the figure because it is generally known to those skilled in the art), which is arranged upstream of the at least one first nozzle 22 and / or the at least one second nozzle 32. A mixer (also not shown in the figure) can be arranged upstream of the at least one plasticizing unit. It is also possible for the at least one plasticizing unit to be controlled via a throughput control (also not shown in the figure). A feed block can also be arranged between the at least one plasticizing unit and the at least one first nozzle 22 and / or the at least one second nozzle 32. The feed block is also shown in the Fig. 1 not shown.

[0062] The first and / or second wiping device 23, 33 may comprise at least one doctor blade and / or one squeegee roller. It is also possible for the at least one first nozzle 22 and / or the at least one second nozzle 32 to be adjustable.

[0063] Furthermore, the coating device 10 can comprise at least one cleaning unit 67 for cleaning the carrier web 11, wherein the cleaning unit 67 is provided and suitable for cleaning at least one side 11a, 11b of the carrier web 11. Furthermore, the coating device 10 can comprise at least one roughening unit 68 for roughening the carrier web 11, wherein the roughening unit 68 is provided and suitable for roughening at least one side 11a, 11b of the carrier web 11. Furthermore, the coating device 10 can comprise at least one smoothing unit 69 for smoothing the carrier web 11, wherein the smoothing unit 69 is provided and suitable for smoothing at least one side 11a, 11b of the carrier web 11. Furthermore, the coating device 10 can comprise at least one processing unit 70 for processing the carrier web 11, wherein the processing unit 70 is provided and suitable for processing at least one side 11a, 11b and / or one edge of the carrier web 11.

[0064] For the sake of simplicity, the cleaning unit 67, the roughening unit 68, the smoothing unit 69, and the processing unit 70 are in the Fig. 1 as a single unit. Of course, it may also be expedient or necessary for the units to be arranged individually or independently of one another at the most suitable positions in the coating device 10.

[0065] Furthermore, the at least one first nozzle 22 and / or the at least one second nozzle 32 may each be configured as an application unit comprising a plurality of nozzles. The plurality of nozzles can apply the plastic material to the first coating roller 20 and / or the second coating roller 30 sequentially, side by side, or in an overlapping manner.

[0066] In particular, the first 22 and / or second nozzles 32 can be provided and suitable for introducing different plastic materials into the cavity 21, 31.

[0067] The Fig. 2shows a detailed view of a coating roller 20 in side view. It is shown that the at least one first cavity 21 can have different levels 21a, 21b, wherein at least one nozzle and at least one stripping unit can be assigned to each level 21a, 21b. Thus, a first level 21a of the cavity 21 can be filled with a plastic material and stripped off before a second level 21b is filled with a different plastic material, if necessary, and stripped off. Of course, it is also possible for the second level 21b to be filled first and then the first level 21a. Simultaneous filling of the levels 21a, 21b is also conceivable. It goes without saying that the second coating roller 30 or its cavity 31 can also be designed with multiple levels.

[0068] In the Fig. 3a further and possibly independent embodiment of the coating device is shown, wherein the same reference numerals are used for the same parts as in the previous Fig. 1 To avoid unnecessary repetition, please refer to the detailed description in the previous Fig. 1 pointed out or referred to.

[0069] Specifically, the Fig. 3 a rough schematic representation of a coating device 10 in plan view. For the sake of a better overview, the nozzles and stripping devices are shown in the Fig. 3 not shown.

[0070] The first cavity 21 of the first coating roller 20 is formed centrally or in the middle of the roller. In the illustrated view from above of the coating device 10, the first counter roller 40, which is arranged below the first coating roller 20, is not visible. During passage through the coating device 10 in the processing direction (represented by an arrow), a first coated region 29 is applied to the first carrier web side 11a, or rather to the upper side of the carrier web 11. The dimensions of the region 29 correspond to those of the first cavity 21. During its further passage through the coating device 10, the carrier web 11 is guided through a second pair of rollers, specifically through a second counter roller 50 and through a second coating roller 30. The second counter roller 50, which, like the first coating roller 20, is applied to the first carrier web side 11a oracts on the illustrated upper side of the carrier web 11, has a counter cavity 51 which corresponds to the first cavity 21, i.e. is at least approximately identical to it in size and shape. It can also be the case that the counter cavity 51 is larger than the first cavity 21. As it passes through the second pair of rollers, the first coated region 29 therefore remains undamaged or unaffected by the counter roller 50 because it is picked up precisely or in a precisely positioned manner by the counter cavity 51. By means of the second coating roller 30, which has a second cavity 31, a second coated region 39 is applied to the second carrier web side 11b, or to the underside of the carrier web 11. In the illustrated embodiment, the second coated region 39 is offset from the first coated region 29 in two axes. It goes without saying that the exact arrangement of areas 29, 39 is left to the discretion of the expert ormeets the specific requirements of the product to be produced.

[0071] In the Fig. 3Furthermore, a carrier web positioning device 60 is sketched, which can be operated by means of a motor. In the example shown, the carrier web positioning device 60 is arranged on the second pair of rollers, in particular on the second coating roller 30. Of course, the carrier web positioning device 60 can also be coupled to both pairs of rollers, or it can also be the case that a further carrier web positioning device 60 is formed, which is arranged on the first pair of rollers. The carrier web positioning device 60 can be designed with a displacement device 62 for displacing the second coating roller 30. The carrier web positioning device 60 can also be designed with a carrier web movement device 63 for moving the carrier web 11. Conceivable movement or positioning directions, which can be carried out by means of the carrier web positioning device 60, are shown in the Fig. 3indicated by directional arrows. In the Fig. 3 It is also shown that an area detection device 61 can be configured, which is provided for detecting the first coated area 29 on the first carrier web side 11a. In the example shown, the area detection device 61 is coupled to the drive of the carrier web positioning device 60 or is supplied with energy by it. The area detection device 61 can, for example, be configured with a camera and a limit switch.

[0072] The embodiments show possible embodiments, whereby it should be noted at this point that the disclosure is not limited to the specifically illustrated embodiments of the same, but rather various combinations of the individual embodiments with each other are also possible and this possibility of variation lies within the skill of the person skilled in the art in this technical field due to the teaching of technical action through objective disclosure.

[0073] The scope of protection is determined by the claims. However, the description and drawings must be used to interpret the claims. Individual features or combinations of features from the various embodiments shown and described may represent independent inventive solutions. The problem underlying these independent inventive solutions can be derived from the description.

[0074] All information on value ranges in this description is to be understood as including any and all sub-ranges thereof, e.g. the information 1 to 10 is to be understood as including all sub-ranges starting from the lower limit of 1 and the upper limit of 10, ie all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0075] For the sake of clarity, it should finally be pointed out that, in order to better understand the structure, some elements have been shown out of scale and / or enlarged and / or reduced in size. Reference symbol list

[0076] 10 Coating device 11 Carrier web 11a First carrier web side 11b Second carrier web side 20 First coating roller 21 First cavity 21a First level 21b Second level 22 First nozzle 23 First stripping device 29 First coated area 30 Second coating roller 31 Second cavity 32 Second nozzle 33 Second stripping device 39 Second coated area 40 First counter roller 50 Second counter roller 51 Counter cavity 60 Carrier web positioning device 61 Area detection device 62 Shifting device 63 Carrier web movement device 67 Cleaning unit 68 Roughening unit 69 Smoothing unit 70 Processing unit

Claims

1. A coating device (10) for the register-accurate application of plastic material to a carrier web (11), comprising a first coating roller (20) and a downstream second coating roller (30), wherein the first coating roller (20) has at least one first cavity (21) and can be filled with plastic material by means of at least one first nozzle (22), and wherein the second coating roller (30) has at least one second cavity (31) and can be filled with plastic material by means of at least one second nozzle (32), and wherein a first wiping device (23) wipes the first coating roller (20) and a second wiping device (33) wipes the second coating roller (30), and wherein the first coating roller (20) cooperates with a first counter roller (40) and coats a first carrier web side (11a) and the second coating roller (30) cooperates with a second counter roller (50) and coats a second carrier web side (11b), and wherein the second counter roller (50) comprises at least one counter cavity (51) corresponding to the at least one first cavity (21), characterized in that the coating device (10) further comprises at least one carrier web positioning device (60), and at least one area detection device (61) which detects the position of a first area (29) of plastic material coated by the at least one first cavity (21).

2. The coating device (10) according to one of the preceding claims, wherein at least an inner surface of at least one of the cavities (21, 31, 51) has a structure.

3. The coating device (10) according to one of the preceding claims, wherein at least an inner surface of at least one of the cavities (21, 31, 51) has a coating.

4. The coating device (10) according to one of the preceding claims, further comprising a thickness measurement with respect to a filling of the at least one first cavity (21) and / or the at least one second cavity (31).

5. The coating device (10) according to one of the preceding claims, wherein the carrier web positioning device (60) comprises at least one of a displacement device (62) of the first and / or second coating roller (20, 30), or at least one carrier web moving device (63).

6. The coating device (10) according to one of claims 1 to 5, wherein the area detection device (61) comprises at least one of a mechanical sensor, an optical sensor or a coding on the first and / or second coating roller (20, 30).

7. The coating device (10) according to one of claims 1 to 6, wherein the area detection device (61) detects the position of at least one edge of the first coated area (29) and / or at least one edge of the carrier web (11).

8. The coating device (10) according to one of the preceding claims, further comprising a dispenser unit for applying at least one film strip.

9. The coating device (10) according to claim 8, wherein the at least one film strip is applied to the carrier web (11) by the dispenser unit along at least one edge of the first and / or second coated area (29, 39).

10. The coating device (10) according to one of the preceding claims, further comprising at least one plasticizing unit which is located upstream of the at least one first nozzle (22) and / or the at least one second nozzle (32).

11. The coating device (10) according to one of the preceding claims, wherein the first and / or second wiping device (23, 33) comprises at least one of a doctor blade or a squeeze roller.

12. The coating device (10) according to one of the preceding claims, wherein the at least one first nozzle (22) and / or the at least one second nozzle (32) are adjustable.

13. The coating device (10) according to one of the preceding claims, further comprising at least one cleaning unit (67) for cleaning the carrier web (11), wherein the cleaning unit (67) is provided and suitable for cleaning at least one side (11a, 11b) of the carrier web (11).

14. The coating device (10) according to one of the preceding claims, further comprising at least one roughening unit (68) for roughening the carrier web (11), wherein the roughening unit (68) is provided and suitable for roughening at least one side (11a, 11b) of the carrier web (11).

15. The coating device (10) according to one of the preceding claims, further comprising at least one smoothing unit (69) for smoothing the carrier web (11), wherein the smoothing unit (69) is provided and suitable for smoothing at least one side (11a, 11b) of the carrier web (11).

16. The coating device (10) according to one of the preceding claims, further comprising at least one processing unit (70) for processing the carrier web (11), wherein the processing unit (70) is provided and suitable for processing at least one side (11a, 11b) and / or one edge of the carrier web (11).

17. The coating device (10) according to one of claims 10 to 16, wherein a mixer is located upstream of the at least one plasticizing unit.

18. The coating device (10) according to one of claims 10 to 17, wherein the at least one plasticizing unit is controlled via a throughput control.

19. The coating device (10) according to one of claims 10 to 18, wherein a feedblock is connected between the at least one plasticizing unit and the at least one first nozzle (22) and / or the at least one second nozzle (32).

20. The coating device (10) according to one of the preceding claims, wherein the at least one first nozzle (22) and / or the at least one second nozzle (32) is each configured as an application unit comprising a plurality of nozzles, and wherein the plurality of nozzles apply the plastic material to the first coating roller (20) and / or second coating roller (30) one after the other or next to each other or in an overlapping manner.

21. The coating device (10) according to claim 20, wherein the first (22) and / or second nozzles (32) are provided and suitable for introducing different plastic materials into the cavity (21, 31).

22. The coating device (10) according to one of the preceding claims, wherein the at least one first cavity (21) and / or the at least one second cavity (31) have different planes (21a, 21b) and each plane (21a, 21b) is assigned at least one nozzle and at least one wiping device.

23. A coating method for coating a carrier web (11) with plastic material, comprising the steps of: - filling at least one first cavity (21) of a first coating roller (20) with plastic material by means of at least one first nozzle (22); - wiping the at least one first cavity (21) by means of a first wiping device (23); - applying the plastic material to a first carrier web side (11a) in a first coated area (29) by cooperation of the first coating roller (20) with a first counter roller (40); - filling at least one second cavity (31) of a second coating roller (30) with plastic material by means of at least one second nozzle (32); - wiping the at least one second cavity (31) by means of a second wiping device (33); - detecting the position of the first area (29) of plastic material coated by the at least one first cavity (21) by an area detection device (61); - applying the plastic material to a second carrier web side (11b) by cooperation of the second coating roller (30) with a second counter roller (50), wherein the second counter roller (50) is controlled in such a way that at least one counter cavity (51) of the second counter roller (50) receives the first coated area (29) when the plastic material is applied to the second carrier web side (11b).