DE102019110248A1 - Drying device with wound web guide - Google Patents

Abstract

A drying device (150) has guide elements (201) which guide a recording medium (120) within a guide plane along a drying path running in a spiral around a deflection element (204). The deflection element (204) is set up to guide the recording medium (120) obliquely or perpendicularly to the guide plane out of the drying device (150) or into the drying device (150). In this way, gentle drying can be made possible within a drying device (150) with a reduced installation space.

Description

The invention relates to a drying device for a (digital) printing device, e.g. for an ink jet printing device.

Inkjet printing devices can be used for printing recording media (such as paper). For this purpose, one or more nozzles are used in order to fire drops of ink onto the recording medium and thereby to generate a desired print image on the recording medium. An inkjet printing device can comprise one or more drying devices in order to dry the recording medium after the print image has been applied and thereby to fix the applied ink on the recording medium.

Thermal energy can be supplied to a recording medium to be dried within a drying device along a drying section. During the drying process, contact between a guide element of the drying device and a recording medium to be dried should be avoided in order to avoid damage to the print image.

With increasing printing speed and / or with increasing thickness of a recording medium, the length of a drying path required for drying a recording medium and thus the overall length and / or the floor space of a drying device typically increase.

The present document deals with the technical task of enabling a gentle and space-efficient drying of a printed recording medium. The object is achieved by the features of independent claim 1.

According to one aspect of the invention, a drying device for drying a recording medium is described. The drying device comprises guide elements which are arranged in such a way that the recording medium is guided between the first end and the second end of a drying section, which runs spirally around the second end of the drying section within a guide plane. In addition, the drying device comprises one or more drying modules arranged along the drying path, which are set up to dry the recording medium and / or a print image arranged on the recording medium. The drying device further comprises a deflection element which is designed to deflect the recording medium in such a way that the recording medium at the second end of the drying device runs along a transport direction which has a directional component which is perpendicular to the guide plane.

• 1 ein Blockdiagramm einer beispielhaften Tintenstrahl-Druckvorrichtung;
• 2a eine beispielhafte Trocknungsvorrichtung in einer Seitenansicht;
• 2b eine beispielhafte Trocknungsvorrichtung in einer Draufsicht;
• 2c ein Blockdiagramm eines beispielhaften Konvektions-Trocknungsmoduls für eine Trocknungsvorri chtung;
• 2d ein Blockdiagramm eines beispielhaften Strahlungs-Trocknungsmoduls für eine Trocknungsvorrichtung; und
• 3 eine beispielhafte Duplex-Druckvorrichtung in einer Draufsicht.

In the following, exemplary embodiments of the invention are described in more detail with reference to the schematic drawing. Show:

• 1 Fig. 3 is a block diagram of an exemplary inkjet printing apparatus;
• 2a an exemplary drying device in a side view;
• 2 B an exemplary drying device in a plan view;
• 2c a block diagram of an exemplary convection drying module for a drying device;
• 2d FIG. 3 is a block diagram of an exemplary radiation drying module for a drying apparatus; and
• 3 an exemplary duplex printing device in a top view.

In the 1 illustrated printing device 100 is for printing on a sheet or sheet or plate or tape-shaped recording medium 120 designed. The record carrier 120 can be made of paper, cardboard, cardboard, metal, plastic, textiles, a combination thereof and / or other suitable and printable materials. The award winner 120 is along the transport direction 1 (represented by an arrow) through the printing unit 140 the printing device 100 guided. 1 Fig. 10 shows an ink jet printing apparatus as an example of a printing apparatus. The aspects described in this document are generally applicable for printing devices (e.g. for printing with ink, toner, varnish, etc.).

The printing unit 140 the printing device 100 comprises two pressure bars in the example shown 102 , each push bar 102 can be used for printing with ink of a certain color (e.g. black, cyan, magenta and / or yellow and possibly MICR ink). Different pressure bars 102 can be used for printing with different inks. The printing device further comprises 100 typically at least one fixing or drying device 150 that is set up on the recording medium 120 to fix the printed image.

A push bar 102 can be one or more printheads 103 include, which are optionally arranged in several rows next to each other to the pixels of different columns 31 , 32 of a print image on the recording medium 120 to print. In the in 1 illustrated example includes a Push latch 102 five print heads 103 , with each printhead 103 the pixels of a group of columns 31 , 32 of a print image on the recording medium 120 prints. The number of printheads 103 a push bolt 102 can be, for example, 5, 10 or more.

Any printhead 103 of the printing unit 140 includes in the in 1 shown embodiment several nozzles 21st , 22nd , each nozzle 21st , 22nd is set up, ink drops onto the recording medium 120 to fire or thrust. A printhead 103 of the printing unit 140 can, for example, several thousand effectively used nozzles 21st , 22nd include, along several rows across the transport direction 1 of the recording medium 120 are arranged. Using the nozzles 21st , 22nd a printhead 103 of the printing unit 140 can image points of a line of a print image on the recording medium 120 across the direction of transport 1 , ie along the width of the record carrier 120 , to be printed.

The printing device 100 further comprises a control unit 101 , for example, a control hardware and / or a controller that is set up, the actuators of the individual nozzles 21st , 22nd of the individual printheads 103 of the printing unit 140 to control in order to transfer the print image onto the recording medium as a function of print data 120 to raise.

The printing unit 140 the printing device 100 thus comprises at least one pressure bar 102 with K nozzles 21st , 22nd (those in one or more printheads 103 can be arranged), which can be controlled with a certain line cycle or with a certain control frequency to a line that transversely to the transport direction 1 of the recording medium 120 runs, with K pixels or K columns 31 , 32 of a print image on the recording medium 120 to print, for example with K> 1000. The nozzles 21st , 22nd are immobile or fixed in the printing device in the example shown 100 installed, and the recording medium 120 is at a certain transport speed at the fixed nozzles 21st , 22nd passed by.

The drying device 150 can be arranged to heat the recording medium 120 and in the on the recording medium 120 to bring applied paint to dry and / or otherwise fix the paint. During the drying process, it should be ensured that the printed side of the recording medium 120 not with guide elements for guiding the recording medium 120 comes into contact, otherwise the print image on the recording medium 120 could be damaged.

The drying process takes a certain amount of time before the ink is sufficiently firmly attached to the recording medium 120 and / or until solvent has evaporated from the paint. With increasing process speed, increasing thickness of the recording medium 120 and / or as the drying time of a color increases, the length of the drying path required increases and thus the overall length and / or footprint of the drying device 150 .

In a drying device 150 the heat can enter the recording medium without contact via radiation and / or hot air 120 and / or the paint can be introduced. Alternatively or in addition, thermal conduction from the rear of the recording medium can be used 120 Heat can be introduced, for example by using heated rollers or saddles. The contact with the heating elements required for this can be achieved by negative pressure and / or by wrapping the recording medium 120 be effected on a heating roller or on a heating saddle.

2a shows a drying device 150 in a side view. The drying device 150 has one or more exemplary drying modules 201 , 210 , 220 , 230 on, especially heated guide rollers 201 , Contact drying modules 210 (each with a heating saddle), radiation drying modules 220 and / or convection drying modules 230 . Furthermore, a drying device 150 possibly have one or more cooling modules (not shown) which are set up a recording medium 120 before leaving the drying device 150 to cool.

2c Figure 3 shows a block diagram of exemplary components of a convection drying module 230 . This in 2c shown convection drying module 230 includes a fan 235 , with which a gaseous medium, in particular air, to one or more heating elements 232 can be passed. That through the heating elements 232 heated drying medium 234 is then through one or more openings or nozzles 233 onto the surface of the recording medium 120 blown. The flow rate of the blower 235 and / or the heating power of the one or more heating elements 232 can via a control module 231 of the drying module 230 controlled or regulated and / or individually adjusted, the control module 231 possibly part of the control unit 101 the drying unit 150 or the printing device 100 can be. In particular, by means of a temperature sensor 236 the temperature in the vicinity of the recording medium 120 are recorded. The control module 231 can be set up the blower 235 and / or the one or more heating elements 232 depending on the sensor data of the temperature sensor 236 to control or regulate. For example a certain temperature in the vicinity of the recording medium 120 can be set.

2d shows an exemplary radiant drying module 220 with a radiation source 223 that is set up radiation 224 (e.g. infrared (IR) radiation) for irradiating the recording medium 120 to generate. The radiation source 223 can for example comprise one or more light-emitting diodes (LEDs). The drying module 220 can have a temperature sensor 226 include. Furthermore, the drying module 220 a control module 161 comprise, which is set up, the radiation source 223 depending on the sensor data of the temperature sensor 226 to operate. For example, the intensity and / or the local distribution and / or the spectrum of the radiation 224 to be changed.

In the 2a shown drying device 150 has guide elements 201 , in particular guide rollers, for guiding a recording medium 120 along the drying section of the drying device 150 on. The guiding elements 201 are arranged such that the record carrier 120 starting from an inlet of the drying device 150 or a first end 202 the drying section is wound in a spiral or spiral shape with one or more turns. In the 2a shown drying device 150 has two turns.

The record carrier 120 is after passing through the screw or spiral drying section at an exit of the drying device 150 or at a second end 203 the drying section from the drying device 150 led out. Here is the second end 203 the drying section in the center of the turns of the drying section or of the recording medium 120 arranged. In other words, the guide elements 201 the drying device 150 are arranged such that the record carrier 120 in helical turns around the second end that are getting smaller and smaller 203 the drying section is wound. By means of a wound arrangement of the recording medium 120 the required installation space and / or the required floor space for the drying device 150 be reduced.

The wound arrangement of the recording medium 120 can only through guide elements 201 which only affects the rear side of the recording medium 120 touch. Contact with the printed face of the recording medium that is to be dried 120 not necessary. This enables the recording medium to be dried gently 120 be effected.

The winding of the recording medium 120 by means of the guide elements 201 leads to the direction of transport 1 within a level, also referred to in this document as the management level, completes a complete rotation of 360 ° one or more times. Such guidance of the recording medium 120 can by means of guide elements arranged in parallel 201 , in particular guide rollers, which are each perpendicular to the guide plane. The guide plane can, for example, correspond to a plane that is spanned by the x-axis and the y-axis of a Cartesian coordinate system.

At the second end 203 the drying section is a deflection element 204 , in particular a 90 ° turner, arranged, which is set up, the recording medium 120 divert so that the transport direction 1 of the recording medium 120 at the second end 203 the drying section has a vector or directional component that is perpendicular to the guide plane (and thus runs along the z-axis of the above-mentioned Cartesian coordinate system). In particular, the recording medium 120 such by a deflection element 204 be diverted that the transport direction 1 of the recording medium 120 at the second end 203 the drying section runs perpendicular to the guide plane.

The deflection element 204 can have a deflection roller that protrudes obliquely from the guide plane. In particular, the deflection roller can have an angle of 45 ° relative to the guide plane. 2 B shows such a deflection roller 204 in a plan view of the drying device 150 . By a deflection roller 204 can be caused that the record carrier 120 simply by touching the back of the recording medium 120 from the drying device 150 can be led out. It can thus be a compact drying device 150 are provided in which no contact with the front side of the recording medium to be dried 120 takes place so that a particularly gentle drying is made possible.

The drying device 150 can have a drying section in which the recording medium 120 (exactly) N complete turns between the first end 202 and the second end 203 the drying section takes place, where N is an integer with N> 0. In this case is the record carrier 120 at the second end 203 the drying section opposite the first end 202 the drying section so that the in the drying device 150 dried front side of the recording medium 120 at the second end 203 the drying section is at the bottom. This is advantageous for a duplex printing device as so to an additional turning unit for turning the recording medium 120 can be dispensed with.

Alternatively, the drying device 150 have (precisely) N-0.5 turns, which leads to the recording medium 120 inside the drying device 150 is not turned. This is advantageous for a simplex printing device in which only the front side of a recording medium 120 is printed.

It should be noted that the record carrier 120 alternatively from the second end 203 until the first end 201 the drying section through the drying device 150 can be performed. The above statements then apply accordingly.

It thus becomes a drying device 150 described in which a recording medium 120 spiral around a deflection element or around a turner 204 is wound so that for a given base area of the drying device 150 the length of the drying section and thus the contact zone between a recording medium 120 and the drying modules 201 , 210 , 220 , 230 can be increased significantly. Through the combination of a spiral-shaped drying section and a deflecting element arranged inside the drying section 204 can thus the required floor space of a drying device 150 can be significantly reduced.

3 Figure 3 shows an exemplary duplex printing apparatus 300 with a first printing unit 140 for printing on the front side of a recording medium 120 and a second printing unit 140 for printing a reverse side of the recording medium 120 . The duplex printing device 300 is in 3 shown in a plan view from above. The (web-shaped) recording medium 120 can from one unwinder 301 unwound and following the printing process by a rewinder 302 be wound up. Following the printing of the front side, the recording medium 120 in a first drying device 150 dried. The direction of transport 1 of the recording medium 120 is at the second end 203 the drying section of the first drying device 150 by 90 ° compared to the transport direction 1 at the first end 202 the drying section of the first drying device 150 turned. Furthermore, the printing device 300 a second drying device 150 at the output of the second printing unit 140 to the back of the recording medium 120 to dry. In this case, too, takes place inside the second drying device 150 a rotation of the transport direction 1 by 90 °.

By adjusting the in a drying device 150 used deflection elements 204 at the exit of the drying device 150 can have different lists of components of a printing device 300 are made possible. Alternatively or in addition, an additional deflection element (not shown) can be used, for example around a cross turner at the second end 203 the drying section of a drying device 150 to build. It can thus be made possible, for example, for processing the front side and the rear side of a recording medium 120 two parallel but laterally offset strings from one printing unit each 140 and a drying device 150 to use.

It thus becomes a drying device 150 for drying a (printed) recording medium 120 described. The drying device 150 includes guide elements 201 , in particular guide rollers which are arranged in such a way that the recording medium 120 between a first end 202 and a second end 203 the drying section of the drying device 150 to be led. The drying section runs within a guide plane (for example within the plane formed by an x and y axis) in a spiral around the second end 203 the drying section. The drying section can have exactly N turns or exactly N-1/2 turns (where N is an integer, with N> 0).

In addition, the drying device comprises 150 one or more drying modules arranged along the drying section 201 , 210 , 220 , 230 that are set up, the recording medium 120 and / or one on the recording medium 120 arranged print image to dry. The print image to be dried can, for example, be on the front side of the recording medium 120 be arranged. The back of the recording medium 120 is then with the guide elements 201 in contact.

The one or more drying modules 201 , 210 , 220 , 230 can have one or more heated guide elements 201 , in particular one or more heated guide rollers. Alternatively or in addition, the one or more drying modules 201 , 210 , 220 , 230 one or more contact drying modules 210 include, each set up with the guide elements 201 back of the recording medium in contact 120 to be heated by means of a heating saddle. Alternatively or in addition, the one or more drying modules 201 , 210 , 220 , 230 one or more convection drying modules 230 comprise, which are set up, the rear side and / or the front side of the recording medium 120 by means of a drying medium 234 , in particular by means of hot air. Alternatively or in addition, the one or more drying modules 201 , 210 , 220 , 230 one or more radiation drying modules 220 which are arranged to include the front side of the recording medium 120 to irradiate.

The drying device further comprises 150 at least one deflection element 204 that is formed, the recording medium 120 divert such that the record carrier 120 at the second end 203 the drying device 150 along a transport direction 1 runs, which has a directional component that is perpendicular to the guide plane. In particular, the deflecting element 204 be designed such that the transport direction 1 of the recording medium 120 at the second end 203 the drying section perpendicular to the guide plane and / or perpendicular to the transport direction 1 at the first end 202 the drying section is up.

It thus becomes a drying device 150 with guide elements 201 described which a recording medium 120 within a (single) guide plane along a spiral around a deflection element 204 running drying section. The deflection element 204 is set up the recording medium 120 inclined or perpendicular to the guide plane from the drying device 150 out or into the drying device 150 to lead into. This allows gentle drying within a drying device 150 be made possible with reduced installation space.

The drying section can be designed such that the transport direction 1 of the recording medium 120 from the first and up to the second end 202 , 203 the drying section may be arranged exclusively within the management level. The deflection element 204 can at the second end 203 the drying section be arranged to the transport direction 1 of the recording medium 120 to orientate from the management level. This creates a particularly compact structure for a drying device 150 enables.

The guiding elements 201 and the deflection element 204 can in particular be arranged and designed such that the recording medium 120 between the first end 202 and the second end 203 the drying section is only touched on one side, in particular only on the back. In other words, the drying device 150 can be designed such that inside the drying device 150 the (to be dried) front side of the recording medium 120 is not touched. This is made possible in particular by the fact that the transport direction 1 of the recording medium 120 at the second end 203 the drying section is arranged obliquely or perpendicular to the guide plane. A recording medium can thus be dried particularly gently 120 are made possible.

The deflection element 204 can comprise a deflection roller which is arranged obliquely, in particular at an angle of 45 °, to the guide plane, and which is partially supported by the recording medium 120 is embraced. In particular, the deflecting element 204 include a 90 ° turner. Furthermore, the deflection roller can be set up as an air cushion between the outer surface of the deflection roller and the recording medium 120 to effect. This can put a load on the recording medium 120 can be further reduced.

The spiral drying section of the drying device 150 can end between the first 202 and the second end 203 of the drying section have (exactly) N full turns, so that the recording medium 120 at the exit 203 the drying device 150 opposite the entrance 202 the drying device 150 is turned. Through the drying device 150 can thus automatically turn the recording medium 120 be effected, which is particularly advantageous in connection with duplex printing.

Alternatively, the spiral drying path can be between the first end 202 and the second end 203 of the drying section have (precisely) N-1 full turns and (precisely) half a turn, so that the recording medium 120 at the exit 203 and at the entrance 202 the drying device 150 has the same upward-facing side (especially the front). The drying device 150 can thus be designed (by using an additional half turn), a turning of the recording medium 120 to avoid, which is particularly advantageous for simplex printing.

The drying device 150 can be a blower 206 which is set up to include a fluid flow extending substantially perpendicular to the guide plane 205 for evacuating moisture from the drying device 150 to generate. So the quality of the drying of a recording medium 120 be improved.

The guiding elements 201 can be designed and arranged in such a way that the transport direction 1 of the recording medium 120 is rotated along the drying section in a single direction about an axis of rotation perpendicular to the guide plane. Alternatively or in addition, the guide elements 201 be designed and arranged such that the Recording media 120 along the drying path at one of the second end 203 the side of the individual guide elements facing away from the drying section 201 runs. A particularly gentle and reliable path of a recording medium can thus be achieved 120 through the drying device 150 be effected.

The record carrier 120 can (by a means of movement, e.g. by a winder 302 a printing device 100 ) from the second end 203 to the first end 202 the drying section, or alternatively from the first end 202 to the second end 203 the drying section can be moved. In other words, the recording medium 120 can if necessary via the second end 203 the drying section into the drying device 150 or alternatively via the first end 202 the drying section into the drying device 150 reach. The drying device 150 can thus flexibly meet different requirements of a printing device 100 be adjusted.

This document also describes a printing device 100 , 300 for printing a recording medium 120 described. The printing device 100 , 300 comprises a first printing unit 140 , which is set up, a first print image on the front side of the recording medium 120 to print. The printing device further comprises 100 , 300 a first drying device 150 that is set up to dry and / or fix the first print image. The first drying device 150 can be designed as described in this document. The printing device further comprises 100 , 300 at least one moving means (e.g. a winder 302 and / or a driven guide roller) which is set up, the recording medium 120 through the first printing unit 140 and through the first drying device 150 to move (to the front of the recording medium 120 to be printed and dried). It thus becomes a printing device 100 , 300 described with a reduced footprint.

The first drying device 150 can be set up the recording medium 120 to turn. This can be done in an advantageous manner by using a drying section with (precisely) N turns and by using (precisely) a deflecting roller 204 be effected.

Furthermore, the printing device 100 , 300 a second printing unit 140 include, which is set up, a second print image on the back of the recording medium 120 to print, and a second drying device 150 which is set up to dry and / or fix the second print image. The second drying device 150 can be designed as described in this document. In addition, the moving means can be set up, the recording medium 120 through the second printing unit 140 and through the second drying device 150 to move.

The one from the second printing unit 140 and the second drying device 150 formed strand of the printing device 100 , 300 perpendicular to the through the first printing unit 140 and the first drying device 150 formed strand stand. A printing device that is particularly space efficient can 100 , 300 to be provided.

List of reference symbols

1

Transport direction (of the recording medium)

21.22

jet

31, 32

Column (of the print image)

100

Printing device

101

Control unit

102

Push latch

103

Printhead

120

Recording media

140

Printing unit

150

Drying device

201

Guide element (guide roller)

202

first end (drying device or drying section)

203

second end (drying device or drying section)

204

Deflection element (90 ° turner)

205

Fluid flow (air flow)

206

fan

210

(Thermal conduction) drying module

220

(Radiation) drying module

221

Control module

223

Radiation source

224

radiation

226

Temperature sensor

230

(Convection) drying module

231

Control module

232

Heating element

233

jet

234

temperature-controlled drying medium (fluid, especially air)

235

fan

300

Duplex printing device

301

Unwinders

302

Rewinder

Claims (10)

Drying device for drying a recording medium (120); wherein the drying device (150) comprises, - Guide elements (201) which are arranged in such a way that the recording medium (120) is guided between a first end (202) and a second end (203) of a drying section which, within a guide plane, spirally around the second end (203) of the drying section runs; - One or more drying modules (201, 210, 220, 230) arranged along the drying path, which are set up to dry the recording medium (120) and / or a print image arranged on the recording medium (120); and - A deflection element (204) which is designed to deflect the recording medium (120) in such a way that the recording medium (120) at the second end (203) of the drying device (150) runs along a transport direction (1) which has a directional component which is perpendicular to the management level. Drying device according to Claim 1 , wherein the guide elements (201) and the deflecting element (204) are arranged and designed such that the recording medium (120) between the first end (202) and the second end (203) of the drying section is only touched on one side. Drying device according to one of the preceding claims, wherein - The deflection element (204) comprises a deflection roller which is arranged obliquely, in particular at an angle of 45 °, to the guide plane, and which is partially wrapped by the recording medium (120); and - The deflection roller is set up in particular to produce an air cushion between a lateral surface of the deflection roller and the recording medium (120). Drying device according to one of the preceding claims, wherein the deflecting element (204) is designed in such a way that the transport direction (1) of the recording medium (120) at the second end (203) of the drying path is perpendicular to the guide plane and / or perpendicular to the transport direction (1) stands at the first end (202) of the drying section. Drying device according to one of the preceding claims, wherein - The spiral drying path between the first end (202) and the second end (203) of the drying path has N full turns, so that the recording medium (120) at the output (203) of the drying device (150) opposite the input (202) of the drying device (150), where N is an integer, with N> 0; or - The spiral drying section between the first end (202) and the second end (203) of the drying section N-1 has full turns and a half turn, so that the recording medium (120) at the output (203) and at the input (202) of the Drying device (150) has a same upwardly directed side. Drying device according to one of the preceding claims, wherein the one or more drying modules (201, 210, 220, 230) comprise, - At least one heated guide element (201), in particular a heated guide roller; - At least one contact drying module (210) which is set up to heat a rear side of the recording medium (120) which is in contact with the guide elements (201) by means of a heating saddle; - At least one convection drying module (230) which is set up to heat the rear side and / or a front side of the recording medium (120) by means of a drying medium (234); and or - At least one radiation drying module (220) which is set up to irradiate the front side of the recording medium (120). Drying device according to one of the preceding claims, wherein the drying device (150) comprises a fan (206) which is set up to generate a fluid flow (205) running essentially perpendicular to the guide plane for evacuating moisture from the drying device (150). Drying device according to one of the preceding claims, wherein the guide elements (201) are designed and arranged such that - the transport direction (1) of the recording medium (120) is rotated along the drying path in a single direction about an axis of rotation perpendicular to the guide plane; and / or - the recording medium (120) runs along the drying path on a side of the individual guide elements (201) facing away from the second end (203) of the drying path; and / or - the recording medium (120) is moved from the second end (203) to the first end (202) of the drying path, or from the first end (202) is moved to the second end (203) of the drying section. Printing device for printing a recording medium (120), wherein the printing device (100, 300) comprises, - A first printing unit (140) which is set up to print a first print image on a front side of the recording medium (120); - A first drying device (150) according to one of the preceding claims, which is set up to dry and / or fix the first print image; and - A moving means which is set up to move the recording medium (120) through the first printing unit (140) and through the first drying device (150). Printing device according to Claim 9 wherein - the first drying device (150) is set up to turn the recording medium (120) over; - the printing device (100, 300) comprises a second printing unit (140) which is set up to print a second print image on a rear side of the recording medium (120), - the printing device (100, 300) comprises a second drying device (150), which is set up to dry and / or fix the second print image; - the moving means is set up to move the recording medium (120) through the second printing unit (140) and through the second drying device (150); and - a strand formed from the second printing unit and the second drying device (150) is perpendicular to a strand formed by the first printing unit and the first drying device (150).

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