EP3458265B1 - Device for the surface treatment of a substrate having a metallic conveyor belt - Google Patents

Description

The invention relates to a device for the surface treatment of a substrate according to the preamble of the subject matter of claim 1.

Devices for the surface treatment of a substrate are used, for example, to print the surfaces of sheet-like or web-shaped substrates or to coat them with a transfer layer of an embossing foil.

From the DE 10159661 C1 a hot stamping device of the type described is known.

Out EP 1 757 450 A2 a sheet-fed printing machine is known which has several corona devices which serve to improve the adhesion of a coating applied to a substrate.

DE 102 32 255 A1 discloses a rotary printing press which has a corona device for improving the adhesion of a print.

Out DE 10 2012 110 149 A1 a hot stamping device is known which has a transport device for a substrate which contains a circumferential thin band.

EP 2 918 529 A2 discloses a transport device having a vacuum suction belt which transports a substrate through the device.

Out WO 2014/146669 A1 a unit and a method for corona treatment of a substrate are known.

The object of the present invention is to provide an improved device for the surface treatment of a substrate.

According to the invention, this object is achieved with the subject matter of claim 1. A device for the surface treatment of a substrate, comprising a transport device, a vacuum suction device, a corona device and a coating device, is proposed, it being provided that the transport device has a transport belt, that the transport belt is designed as a vacuum suction belt of the vacuum suction device, and that the transport belt as a counter electrode of the Corona device is formed. A sealing element with a circumferential sealing lip is arranged between the side of the conveyor belt facing away from the substrate and a suction head of the vacuum suction device, the suction head being arranged under the corona device.

The device according to the invention has the advantage that the transport device has a transport belt that fulfills three functions, namely transporting the substrate, fixing the substrate in position by vacuum suction on the transport belt and providing an electrode for the corona device. The conveyor belt can in particular fulfill these three functions at the same time, so that a very advantageous synergy arises between these functions.

It can be provided that the conveyor belt is mounted on two deflecting rollers which are spaced apart from one another, one of the deflecting rollers being designed as a drive roller.

The conveyor belt can be designed as a revolving belt, which revolves in particular around the two deflecting rollers.

It can further be provided that the conveyor belt is mounted on a support device in the area of the coating device and / or the corona device. Several support devices can be provided, which are arranged, for example, in the area of the coating device and the corona device.

The support device can have a support roller or a plurality of support rollers which are arranged next to one another in the longitudinal extension of the conveyor belt. The support rollers can in particular rotate at the same speed as the conveyor belt on top of it moves, so that the lowest possible friction arises between the support rollers and the conveyor belt. This means that the support rollers have the same speed around their circumference as the conveyor belt on top.

As an alternative or in addition, the support device can have an in particular stationary support body, preferably in the form of a plate.

The conveyor belt can have a thickness in the range from 0.2 mm to 1 mm, preferably in the range from 0.3 mm to 0.5 mm.

It can be provided that the conveyor belt is made of a material which has a degree of hardness in the range from 450 HV10 to 520 HV10, preferably in the range from 465 HV10 to 500 HV10.

In an advantageous embodiment, it can be provided that the conveyor belt is designed and / or supported in such a way that its maximum deflection under operational load is in the range from 1 μm to 10 μm.

It can also be provided that the surface of the conveyor belt facing the substrate is polished, i.e. has a roughness depth of less than 0.3 µm.

The conveyor belt can be made from a steel alloy.

In an advantageous embodiment, it can be provided that the conveyor belt is made of stainless steel.

Alternatively, it can be provided that the conveyor belt is made from copper or aluminum or titanium or from an alloy containing copper and / or aluminum and / or titanium, in particular from an alloy containing aluminum and / or titanium.

The conveyor belt can be designed as a seamless belt. A seamless conveyor belt without joints offers the same conditions over its entire surface with regard to its property as a mechanical counter-bearing for the substrate.

The conveyor belt can have several partial conveyor belts which are arranged adjacent to one another in the direction of transport, preferably with the smallest possible spacing between the partial conveyor belts. These partial conveyor belts can have the same or different properties, in particular with regard to material and / or hardness and / or thickness and / or flexural strength. The properties described above for the conveyor belt also apply to the partial conveyor belts.

For example, a first partial conveyor belt can be arranged in the area of the coating device and a second partial conveyor belt in the area of the corona device.

In an advantageous embodiment it can be provided that a support element is arranged between adjacent partial conveyor belts which bridges the space between the adjacent partial conveyor belts without a gap.

Alternatively, it can be provided that the conveyor belt is designed as a link belt made of plate-shaped links, with adjacent links being connected to one another by a swivel joint in such a way that they form a gap-free support surface in the extended state.

It can be provided that the conveyor belt has transport recesses on the edge, and that the deflection rollers have corresponding toothed rims which engage in the transport recesses.

It can further be provided that the conveyor belt has through holes, in particular a multiplicity of through holes.

The through holes can be designed as in particular circular bores and / or in particular elliptical elongated holes and / or slots and / or rhombuses.

It can further be provided that the through holes are arranged in a grid.

The grid can be regular or irregular or random.

It can also be provided that the grid is designed differently in areas.

The through holes can have a diameter in the range from 0.2 mm to 5 mm, preferably in a range from 0.3 mm to 2 mm, or have an area corresponding to a circular hole of the aforementioned diameter, in particular if the through hole is not circular.

According to the invention it is provided that a sealing element with a circumferential sealing lip is arranged between the side of the conveyor belt facing away from the substrate and a suction head of the vacuum suction device.

In an advantageous embodiment, it can be provided that the negative pressure of the vacuum suction device is in the range from 10,000 Pascal to 100,000 Pascal (0.1 bar to 1 bar), in particular in the range from 10,000 Pascal to 75,000 Pascal (0.1 bar to 0.75 bar) .

It can be provided that the corona device has a housing which is open on its underside and in the lower end section of which an electrode is arranged. The electrode can, for example, be designed as an air-cooled ceramic electrode, have a cross section of 16 mm × 16 mm and a length that corresponds to the width of the conveyor belt. The corona device can be arranged with its longitudinal extent transverse to the transport direction of the conveyor belt and above the substrate.

It can be provided that the electrode of the corona device forms the cathode and the conveyor belt as a counter electrode forms the anode of the corona device, a corona gap being formed between the cathode and the anode. The corona gap can, for example, be in the range from 1 mm to 2 mm.

A high electrical voltage is applied to the electrode and the counter electrode, which is generated by a high-frequency generator with a frequency range of 10 kHz to 60 kHz and a field strength of 20 kV / cm to 30 kV / cm in the air gap. Field ionization forms ions that are accelerated in the electric field and adhere to the surface of the substrate.

By forming polar, functional groups, the polar portion of the surface tension of the substrate can be increased. The surface of the substrate is electrically charged and the surface energy of the substrate is increased. For good wetting of the substrate with a liquid, e.g. a UV adhesive or a printing ink, the surface tension of the substrate should be about 10 mN / m to 15 mN / m higher than the surface tension of the liquid. For example, the surface tension of an ink can be between 20 mN / m to 25 mN / m and the surface tension of a film-shaped substrate to be printed can be between 30 mN / m to 35 mN / m. By means of the corona device, the surface tension of the substrate can be increased to approx. 40 mN / m to 45 mN / m, whereby this substrate can be printed.

The corona gap can be designed to be adjustable. For example, the electrode of the corona device can be designed to be height-adjustable. As a result, the smallest possible corona gap can be set, for example depending on the thickness and / or the material of the substrate, in order to be able to adapt the electrical field surrounding and / or penetrating the substrate.

The corona device can have a suction device connected to the housing in a gas-tight manner for suctioning off ozone. The ionization of the air in the corona gap creates ozone, which has to be extracted or destroyed. The ozone-containing exhaust air is led through an exhaust hose and discharged outside of the production room. Optionally, the ozone-containing exhaust air can be passed through an ozone destroyer, for example an activated carbon filter, before being discharged into the environment. In this way 99.5% of the ozone can be destroyed. The exhaust air hose can, for example, have a length of 12 m to 15 m. A delivery rate of 4.9 m ³ / min has proven itself. The suction device can simultaneously form a cooling device for the electrode.

It can be provided that the coating device is designed as a printing device. The printing device can, for example, have a printing roller and an ink application device and / or work according to the screen printing principle and / or according to the ink jet principle.

It can also be provided that the coating device has an embossing device for transferring a onto a carrier layer Has transfer film, in particular a hot stamping film or cold stamping film arranged transfer layer on the substrate.

An embossing roller of the embossing device can have a coating of an elastomer with a thickness in the range from 3 mm to 10 mm, preferably in the range from 5 mm to 10 mm, on its outer circumference. The elastomer is preferably silicone rubber. The silicone rubber preferably has a hardness in the range from 60 ° Shore A to 95 ° Shore A, preferably in the range from 70 ° Shore A to 90 ° Shore A. A support roller arranged in the area of the embossing device forms a counter-pressure roller for the embossing roller.

The coating device can preferably be arranged downstream behind the corona device. As a result, the substrate can be coated by means of the corona device after the surface of the substrate has been treated.

Downstream of the corona device, a plurality of coating stations can also be arranged downstream one behind the other, for example a plurality of printing devices and / or a plurality of embossing devices and / or a printing device and an embossing device or other combinations thereof. The printing devices can each work according to the same printing process and / or according to different printing processes. The embossing devices can each work according to the same method and / or according to different methods.

It is also possible to arrange further processing stations such as sorting stations, punching stations, blind embossing stations, folding stations or other processing stations for processing the substrate downstream of the corona device and preferably downstream of the at least one coating device.

The transfer film has a transfer layer arranged on a carrier layer. The carrier layer can be made of PET or of polypropylene, polystyrene, PVC, PMMA, ABS, polyamide, for example. The hot stamping foil is arranged in such a way that the transfer layer faces the top side of the substrate to be stamped. The transfer layer can be coated with a heat-activated adhesive layer or be self-adhesive (cold adhesive). A separating layer, which facilitates detachment of the transfer layer from the carrier layer, can be arranged between the transfer layer and the carrier layer.

The transfer layer of the transfer film generally has several layers, in particular a release layer (for example made of wax or wax-containing compounds), a protective lacquer layer, a heat-activated adhesive layer. In addition, one or more decorative layers and / or functional layers applied over the entire area can be included. Decorative layers are, for example, colored (opaque or transparent or translucent) lacquer layers, metal layers or relief structures (haptically or optically refractive or optically diffractive). Functional layers are, for example, electrically conductive layers (metal, ITO (ITO = Indium Tin Oxide)), electrically semiconducting layers (e.g. semiconductor polymers) or electrically non-conductive layers (electrically insulating lacquer layers) or optically matting or anti-reflective layers (eg with microscopic matt structures) or structures that modify the adhesive effect and / or the surface tension (lotus effect structures or similar). Additional auxiliary layers, in particular adhesion promoter layers, can be present between the individual layers. The individual layers of the transfer layer are approximately between 1 nm and 50 µm thick.

The substrate is preferably a flexible substrate, for example paper with a basis weight of 30 g / m ² to 350 g / m ² , preferably 80 g / m ² to 350 g / m ² or cardboard or plastic or a hybrid material made of several paper and Plastic layers or a laminate of several paper and / or plastic layers.

Fig. 1

ein erstes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in schematischer Darstellung;

Fig. 2

ein zweites Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in schematischer Darstellung;

Fig. 3

ein drittes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in schematischer Darstellung;

Fig. 4

ein erstes Ausführungsbeispiel eines Transportbandes in Fig. 1 in schematischer Draufsicht;

Fig. 5

ein zweites Ausführungsbeispiel des Transportbandes in Fig. 1 in schematischer Draufsicht;

Fig. 6

ein drittes Ausführungsbeispiel des Transportbandes in Fig. 1 in schematischer Draufsicht;

Fig. 7

ein viertes Ausführungsbeispiel des Transportbandes in Fig. 1 in schematischer Draufsicht;

Fig. 8

ein viertes Ausführungsbeispiel des Transportbandes in Fig. 1 in der Draufsicht.

The invention will now be explained in more detail on the basis of exemplary embodiments. Show it

Fig. 1

a first embodiment of the device according to the invention in a schematic representation;

Fig. 2

a second embodiment of the device according to the invention in a schematic representation;

Fig. 3

a third embodiment of the device according to the invention in a schematic representation;

Fig. 4

a first embodiment of a conveyor belt in Fig. 1 in a schematic plan view;

Fig. 5

a second embodiment of the conveyor belt in Fig. 1 in a schematic plan view;

Fig. 6

a third embodiment of the conveyor belt in Fig. 1 in a schematic plan view;

Fig. 7

a fourth embodiment of the conveyor belt in Fig. 1 in a schematic plan view;

Fig. 8

a fourth embodiment of the conveyor belt in Fig. 1 in top view.

Fig. 1 shows a device 1 for the surface coating of a substrate 2, comprising a transport device 3, a vacuum suction device 4, a corona device 5 and a coating device 6.

The transport device 3 is designed as a revolving conveyor belt 31 which is mounted on two deflecting rollers 32 spaced apart from one another, one of the deflecting rollers 32 being designed as a drive roller 32a. The conveyor belt 31 is in the in Fig. 1 The embodiment shown is designed as a seamless band made of stainless steel.

It can also be provided that the conveyor belt 31 is designed as a link belt made of plate-shaped links, adjacent links being connected to one another by a swivel joint in such a way that they form a gap-free support surface in the extended state. In this embodiment, not shown in the figures, the conveyor belt 31 can advantageously have edge-side conveyor recesses that correspond to Toothed rings cooperate, which are connected to the deflection rollers 32 in a torsionally rigid manner.

The conveyor belt 31 revolves in a transport direction 31t. The substrate 2 is arranged in a transport section of the transport belt 31 on the transport belt 31 and is fixed on the transport belt 31 by negative pressure. The substrate 2 is moved in a transport direction 2t corresponding to the transport direction 31t of the transport belt 31, which corresponds to the transport direction 31 in the transport section.

The conveyor belt 31 is mounted on a support device 7 in the area of the corona device 5 and in the area of the coating device 6. The coating device 6 is arranged downstream behind the corona device 5.

The support device 7 arranged below the corona device 5 is in the in Fig. 1 The illustrated embodiment is formed from four support rollers 71 which are arranged next to one another in the longitudinal extension of the conveyor belt 31. The support rollers 71 can in particular rotate at the same speed as the overlying conveyor belt 31 moves, so that the lowest possible friction arises between the support rollers 71 and the conveyor belt 31. That is to say, the support rollers 71 have the same speed on their circumference as the conveyor belt 31 on top. The four support rollers 71 are mounted in a rigid or adjustable manner so that they can rotate. The axes of rotation of the support rollers 71 can be fastened adjustably at their outer bearing point in such a way that, for example, an adjustment with an eccentric bearing and a corresponding fixing of the bearing a Adjustment of the axes of rotation relative to the conveyor belt 31 is possible. The axes of rotation of the support rollers 71 are aligned transversely to the transport direction 31t of the conveyor belt 31. As an alternative or in addition to the support rollers 71, a plate-shaped support, in particular as a fixed support body, can also be provided.

The support device 7 arranged below the coating device 6 has a support roller 71, the axis of rotation of which is likewise oriented transversely to the transport direction 31t of the transport belt 31.

In the in Fig. 1 In the illustrated embodiment, the maximum deflection of the conveyor belt 31 under operational load is in the range from 1 μm to 10 μm. With such a slight deflection, the conveyor belt can serve particularly advantageously as a mechanical counter-bearing for the substrate.

The conveyor belt 31 has a thickness in the range from 0.2 mm to 1 mm, preferably in the range from 0.3 mm to 0.5 mm.

The conveyor belt 31 is made of a material which has a degree of hardness in the range from 450 HV10 to 520 HV10, preferably in the range from 465 HV10 to 500 HV10.

The conveyor belt 31 can be formed from a steel alloy, preferably from stainless steel. It can also be provided that the conveyor belt is made of copper, aluminum or titanium.

The surface of the conveyor belt facing the substrate 2 is polished, i.e. it has a roughness depth of less than 0.3 µm.

The conveyor belt 31 is designed as a vacuum suction belt 31v with through holes 31d (see Figures 4 to 8 ), by means of which a negative pressure can be formed on the upper side of the conveyor belt 31 which fixes the substrate 2 on the conveyor belt 31. In the in Fig. 1 The illustrated embodiment, the negative pressure is in the range from 10,000 Pascal to 100,000 Pascal (0.1 bar to 1 bar).

The through holes 31 can be designed as in particular circular bores and / or in particular elliptical elongated holes and / or slots and / or rhombuses.

Via a sealing element 42 arranged on the side of the conveyor belt 31 facing away from the substrate 2, a section of the conveyor belt 31 arranged above the sealing element 42 is connected to a suction head 41 of the vacuum suction device 4 in a gas-tight or approximately gas-tight manner. The sealing element 42 is designed as a circumferential sealing lip. In the in Fig. 1 illustrated embodiment, a suction head 41 is provided according to the invention, wherein the

Suction head 41 is arranged under the corona device 5. The vacuum suction device 4 is designed with a vacuum pump 43, the inlet of which is connected to the suction head 41.

Fig. 4 and 8th show a first embodiment of the vacuum suction belt 31v. Through holes 31 d designed as bores with a circular cross section are arranged in a grid. The through holes 31d can have a diameter in the range from 0.2 mm to 5 mm, preferably in have a range of 0.3 mm to 2 mm or have a surface area corresponding to a circular hole of the aforementioned diameter. In the in Fig. 7 The illustrated embodiment, the through holes 31 d have a diameter of 1 mm.

Fig. 5 shows a second embodiment in which the through holes 31d are designed as diamond-shaped elongated holes which are arranged in a grid.

Fig. 6 shows a third embodiment, in which the through holes 31 are formed in areas with a different contour. In a central area, the through holes 31d are formed in a diamond shape. In the two edge regions, the through holes 31 are formed with a circular cross section. The grid is also designed differently in areas.

Fig. 6 Fig. 13 shows a fourth embodiment in which the through holes 31d are randomly arranged.

As the exemplary embodiments described above show, the grid can be formed regularly or irregularly or randomly.

The corona device 5 has a housing 51 which is open on the underside and in which an electrode 52 is arranged. The electrode 52 is designed as an air-cooled ceramic electrode and is arranged above the substrate 2. The conveyor belt 31 forms a counter electrode 31e, which is in particular grounded. In the in Fig. 1 The illustrated embodiment has the electrode 52 a cross section of 16 mm x 16 mm and a length that corresponds to the width of the conveyor belt 31 (here: 350 mm). The corona device 5 can be arranged with its longitudinal extension transverse to the transport direction 31t of the transport belt 31. The electrode 52 is connected as a cathode. The counter electrode 31e is connected as an anode. A corona gap 51, between which the corona discharge is generated, is formed between the electrode 52 and the counter electrode 31e. The corona gap 5l is adjustable, in particular adjustable in height, and in FIG Fig. 1 illustrated embodiment 1 mm to 2 mm. As a result, the smallest possible corona gap 51 can be set, for example depending on the thickness and / or the material of the substrate 2, in order to be able to adapt the electric field surrounding and / or penetrating the substrate 2.

A high electrical voltage is applied to the electrode 52 and the counter-electrode 31e, which is generated by a high-frequency generator 54 with a frequency range of 10 kHz to 60 kHz and forms a field strength of 20 kV / cm to 30 kV / cm in the air gap 5l. Ions are formed by field ionization, which are accelerated in the electric field and adhere to the surface of the substrate 2.

By forming polar, functional groups, the polar portion of the surface tension of the substrate 2 can be increased. The surface of the substrate 2 is electrically charged, the surface energy of the substrate 2 is increased. For good wetting of the substrate 2 with a liquid, for example a UV adhesive or a printing ink, the surface tension of the substrate 2 should be approximately 10 mN / m to 15 mN / m higher than the surface tension of the liquid. For example, the The surface tension of an ink is between 20 mN / m to 25 mN / m and the surface tension of a film-shaped substrate 2 to be printed is between 30 mN / m to 35 mN / m. The surface tension of the substrate 2 can be increased to approximately 40 mN / m to 45 mN / m by means of the corona device 5, as a result of which this substrate 2 can be printed.

The corona device 5 has a suction device 53 connected to the housing 51 in a gas-tight manner for suctioning off ozone. The ionization of the air in the air gap 5l creates ozone, which has to be sucked off or destroyed. The ozone-containing exhaust air is led through an exhaust hose and discharged outside of the production room. Optionally, the ozone-containing exhaust air can be passed through an ozone destroyer, for example an activated carbon filter, before being discharged into the environment. In this way 99.5% of the ozone can be destroyed. The exhaust air hose can, for example, have a length of 12 to 15 m. A delivery rate of 4.9 m ³ / min has proven itself. The suction device 53 simultaneously forms a cooling device for the electrode 52.

The coating device 6 is designed as an embossing device 65 for transferring a transfer layer arranged on a carrier layer of a transfer film 66, in particular a hot stamping film or cold stamping film, to the substrate 2.

An embossing roller 67 of the embossing device 65 has on its outer circumference a coating made of an elastomer with a thickness in the range from 3 mm to 10 mm, preferably in the range from 5 mm to 10 mm. The elastomer is preferably silicone rubber. In the in Fig. 1 shown In the exemplary embodiment, the silicone rubber has a hardness of 80 ° Shore A. The support roller 71 arranged in the area of the embossing device 65 forms a counter-pressure roller for the embossing roller 67.

In the in Fig. 2 illustrated embodiment are in contrast to Fig. 1 two suction heads 41 are provided, one suction head 41 being arranged under the corona device 5 and the other suction head 41 being arranged under the coating device 6. The vacuum suction device 4 is designed with a vacuum pump 43, the inputs of which are connected to the two suction heads 41.

In the Fig. 3 The device 1 shown is like that in Fig. 2 The device shown is designed, with the difference that the coating device 6 is designed as a printing device 61, comprising a printing roller 62 and an ink application device 63. Other printing devices can also be provided, for example a printing device based on the screen printing principle and / or based on the inkjet principle.

List of reference symbols

1

contraption

2

Substrate

2t

Transport direction

3

Transport device

3t

Transport direction

4th

Vacuum suction device

5

Corona device

5l

Air gap

6th

Coating device

7th

Support device

31

Conveyor belt

31 d

Through hole

31 e

Counter electrode

31t

Transport direction

31 BC

Vacuum suction belt

32

Guide rollers

32a

Drive roller

41

Suction head

42

Sealing element

43

Vacuum pump

51

casing

52

electrode

53

Suction device

54

High frequency generator

61

Printing facility

62

Pressure roller

63

Paint application device

65

Embossing device

66

Transfer film

67

Embossing roller

71

Platen

Claims (14)

1. Device (1) for the surface treatment of a substrate (2), having a transport device (3), a vacuum suction device (4), a corona device (5) and a coating device (6),
   wherein the transport device (3) has a conveyor belt (31), and the conveyor belt (31) is designed as a vacuum suction belt (31v) of the vacuum suction device (4),
   characterised in that
   the conveyor belt (31) is designed as a counter electrode (31e) of the corona device (5), wherein a sealing element (42) having a peripheral sealing lip is arranged between the side of the conveyor belt (31) facing away from the substrate (2) and a suction head (41) of the vacuum suction device (4), and the suction head (41) is arranged under the corona device (5).
2. Device according to claim 1,
   characterised in that
   the conveyor belt (31) is mounted on two spaced-apart deflection rollers (32), wherein one of the deflection rollers (32) is formed as a drive roller (32a).
3. Device according to claim 1 or 2,
   characterised in that
   the conveyor belt (31) is designed as a circulating belt.
4. Device according to one of the preceding claims,
   characterised in that
   the conveyor belt (31) is mounted on a support device (7) in the region of the corona device (5) and/or of the coating device (6), in particular wherein the support device (7) has a support roller (71) or several support rollers (71), which are arranged adjacent to one another in the longitudinal extension of the conveyor belt (31).
5. Device according to one of the preceding claims,
   characterised in that
   the conveyor belt (31) has a thickness in the range of from 0,2mm to 1mm, preferably in the range of from 0.3mm to 0.5mm, and/or is formed from a material that has a hardness in the range of from 450 HV10 to 520 HV10, preferably in the range of from 465 HV10 to 500 HV10, and/or is formed and/or mounted in such a way that its maximum deflection under operational load is in the range of from 1µm to 10µm.
6. Device according to one of the preceding claims,
   characterised in that
   the conveyor belt (31) is formed from a steel alloy, in particular wherein the conveyor belt (31) is formed from stainless steel.
7. Device according to one of the preceding claims,
   characterised in that
   the conveyor belt (31) is formed as a seamless belt.
8. Device according to one of claims 1 to 7,
   characterised in that
   the conveyor belt (31) has several partial conveyor belts, which are arranged following one another in the conveying direction (3 It), in particular wherein a support element is arranged between adjacent partial conveyor belts, which support element bridges the space between the adjacent partial conveyor belts without gaps, and/or the conveyor belt (31) is formed as a link belt made of plate-shaped links, wherein adjacent links are connected to one another by means of a swivel joint in such a way that they form a gap-free support surface in the extended state, in particular wherein the conveyor belt (31) has edge-sided conveying recesses, and the deflection rollers have corresponding gear rims that engage in the conveying recesses.
9. Device according to one of the preceding claims,
   characterised in that
   the conveyor belt (31) has through holes (31d), in particular wherein the through holes (31d) are formed as bores and/or elongated holes and/or slots and/or rhombuses, in particular preferably wherein the through holes (31d) are arranged in a grid, particularly preferably wherein the grid is formed regularly or irregularly or randomly and/or differently area by area.
10. Device according to claim 9,
    characterised in that
    the through holes (31d) have a diameter in the range of from 0.2mm to 5mm, preferably in a range of from 0.3mm to 2mm or have an area corresponding to a circular hole of the aforementioned diameter.
11. Device according to one of the preceding claims,
    characterised in that
    the negative pressure of the vacuum suction device is in the range of from 10000 Pascal to 100000 Pascal (0.1 bar to 1 bar), preferably in the range of from 10000 Pascal to 75000 Pascal (0.1 bar to 0.75 bar).
12. Device according to one of the preceding claims,
    characterised in that
    the corona device (5) has a housing (51) that is open on its underside, in the lower end section of which an electrode (52) is arranged, in particular wherein the electrode (52) of the corona device (5) forms the cathode and the conveyor belt (31) as a counter electrode forms the anode of the corona device (5), wherein a corona gap (51) is formed between the cathode and the anode, in particular preferably wherein the corona gap (51) is designed to be adjustable.
13. Device according to one of the preceding claims,
    characterised in that
    the coating device (6) is formed as a printing device (61).
14. Device according to one of claims 1 to 13,
    characterised in that
    the coating device (6) is formed as an embossing device (65) for transferring a transfer layer arranged on a carrier layer of a transfer film (66) to the substrate (2).

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