WO2020108865A1

WO2020108865A1 - Rotary printing machine with at least one printing unit for printing substrates

Info

Publication number: WO2020108865A1
Application number: PCT/EP2019/078623
Authority: WO
Inventors: Johannes Schaede; Rob STIERMAN
Original assignee: Koenig & Bauer Ag
Priority date: 2018-11-29
Filing date: 2019-10-22
Publication date: 2020-06-04
Also published as: DE102018130284A1

Abstract

The invention relates to a rotary printing machine with at least one printing unit (03) for printing substrates (21). A drying unit (22) is provided in the transport path of the substrates (21) in or downstream of the at least one printing unit (03), wherein substrates (21) printed by the at least one printing unit (03) are guided or at least can be guided through a chamber (23) of the drying unit (22), and the chamber (23) of the drying unit (22) contains a gaseous medium which is oxygen-reduced by means of an inert gas. The chamber (23) of the drying unit (22) surrounds at least one curved section of a cylinder (04; 06; 36; 37; 38) which transports the substrates (21) to be dried, and each of the at least one cylinders (04; 06; 36; 37; 38) surrounded by the chamber (23) of the drying unit (22) at least in a curved section is designed as a suction cylinder (38). Two pneumatic systems are provided. A first pneumatic system on the suction cylinder (38) provides the suction air required to hold the substrates (21) to be transported if a substrate (21) held on the lateral surface of the suction cylinder (38) is located outside of the chamber (23) of the drying unit (22), and a second pneumatic system which is separate from the first pneumatic system provides the suction air required to hold the substrates (21) to be transported if the substrate (21) held on the lateral surface of the suction cylinder (38) is located within the chamber (23) of the drying unit (22).

Description

description

Rotary printing machine with at least one printing unit for printing on

Substrates

The invention relates to a rotary printing press with at least one printing unit for printing substrates in accordance with the preamble of claim 1.

From DE 10 2015 013 068 A1 a rocking device with a cylinder for transporting a printed sheet through a drying device is known, with at least one gripper bar for fixing a front edge of the sheet to a jacket of the cylinder and means for generating a vacuum on the jacket, the holds the sheet pressed flat against the jacket, an irradiation module facing the cylinder, the means comprising a plurality of vacuum chambers which are distributed in the cylinder in the circumferential direction and opening into the bores of the jacket, the jacket comprising a perforated plate which is drawn open, the vacuum chambers

are preferably connected to at least one suction connection led out on an end face of the cylinder, the suction connection being closed depending on the rotational position of the cylinder, connected to the vacuum source or open to the environment. In addition, the gripper bar is preferably arranged in a longitudinal groove of the cylinder and a cover of the longitudinal groove is machined.

DE 10 2014 003 71 1 A1 discloses a cylinder for transporting printed sheets along a UV or electron beam dryer, the cylinder having inert gas openings which are at least temporarily acted upon by inert gas during operation.

DE 10 2014 002 907 B3 is a drying unit for UV or

Electron irradiation under drying in an inert gas atmosphere

Printing sheet known, comprising a vacuum drum system for a Printing machine sheet processing machine, comprising suction grooves for the pneumatic holding of the printing material sheet, locking slides being arranged in the suction grooves.

DE 197 04 284 A1 describes an inerting device for emitter devices for drying and / or curing paints and / or lacquers within

Printing machines known, in particular for sheet-fed printing machines with

Excimer emitters and blow nozzles arranged within the inerting chamber, the blow nozzles being designed to be throttled and / or detachable in regions over the width of the printing material web, and a control device which detects the front and rear edge of the printing material and controls blowing nozzles and / or excimer lamps is arranged upstream of the blowing nozzles and / or excimer lamps .

From WO 2005/097927 A1 a method for printing is known in which an ink is printed using an Intaglio printing machine on a substrate, in which the ink is hardened after printing, in which the hardening z. B. done by an electron beam. This method is e.g. B. used for the production of banknotes.

DE 10 2006 032 679 A1 describes a method for producing a

Security elements for a security paper, document of value or the like with a substrate are known, the substrate being at least partially equipped with a coating comprising at least two layers, with the steps

a) applying a first layer to the substrate,

b) applying at least one second layer to the first layer, the first layer not being fully hardened before applying the second layer, c) embossing at least one layer of the coating,

d) hardening of the coating,

the application of the layers e.g. B. by a printing process, in particular Gravure printing, flexographic printing or offset printing takes place, the hardening of the layers e.g. B. by ultraviolet radiation and / or by electron radiation.

DE 10 2016 200 544 A1 describes a device for the treatment of

known sheet-shaped substrate, with a sheet guide cylinder and an inerting device associated with the sheet guide cylinder, the

Sheet guiding cylinder has first holding means for holding the front edge of the substrate and second holding means are provided which hold the substrate in one of the

Hold the substrate leading edge spaced area on the sheet guide cylinder and the substrate guided by the sheet guide cylinder can be acted upon with inert gas, a third holding means being arranged outside the periphery of the sheet guide cylinder.

The invention has for its object to provide a rotary printing machine with at least one printing unit for printing substrates with an improved

To create drying unit, the drying unit is suitable in an industrial production process for the highest possible printing speed of the printing press.

The object is achieved by the features of claim 1. The dependent claims show advantageous refinements and / or developments of the solution found.

The advantages that can be achieved with the invention are, in particular, that the

Drying unit of the printing press in an industrial production process is suitable for the highest possible printing speed of the printing press. Further advantages are evident from the exemplary embodiments described.

Embodiments of the invention are shown in the drawings and are in Described in more detail below.

Show it:

1 shows a printing press with at least one printing unit;

2 shows a drying unit for electron beam curing;

3 shows a detail from the printing press shown in FIG. 1 with a first arrangement of a drying unit for electron beam curing in the printing unit;

4 shows a detail from the printing press shown in FIG. 1 with a second arrangement of a drying unit for electron beam curing in the printing unit;

FIG. 5 shows a detail from the printing press shown in FIG. 1 with an arrangement of a drying unit for electron beam curing on an intermediate cylinder;

Fig. 6 shows a section of a printing press with an arrangement of a

Drying unit for electron beam hardening on a transport device;

7 shows a drying unit attached to a suction cylinder

Electron beam curing;

8 shows a drying unit for electron beam curing in connection with a plurality of suction rolls; 9 shows a drying unit that can be used as an independent structural unit.

1 shows an example of a printing press, preferably a rotary printing press, each with at least one printing unit. The printing machine is e.g. B. as one

Formed sheet-fed printing press, preferably as a sheet-fed rotary printing press, in particular as a sheet-fed gravure printing press, very particularly as a sheet-fed rotary printing press printing in an intaglio printing process. The intaglio printing process is a gravure printing process which is preferably used for the industrial production of banknotes, security documents or security elements.

The sheet-fed rotary printing press shown as an example in FIG. 1, in particular printing in an intaglio printing process, preferably has at least the following machine units or assemblies:

a) a sheet feeder 01, by means of which a substrate 21 to be printed in the form of, in particular, stacked printed sheets 21 is provided or at least can be provided on the sheet-fed rotary printing press; the rectangular printed sheets 21 have z. B. an edge dimension in the range between 475 x 450 mm and 700 x 820 mm; the grammage of the printed sheets 21 is, for. B. in the range between 70 g / m ² and

120 g / m ² ;

b) a sheet feeder 02, by means of which sheet feeder 01 is provided

Sheet 21 z. B. over one or more transfer drums a printing unit 03 of the sheet-fed rotary printing press in a sequence, d. H. are fed individually one after the other or at least can be fed;

c) at least one printing unit 03, which also has a counter-pressure cylinder

designated pressure cylinder 04 and one with the pressure cylinder 04

cooperating plate cylinder 06 applying a print image to the relevant printing sheet 21, the printing cylinder 04 and plate cylinder 06 being positioned against one another under high pressure or at least adjustable; a wiping cylinder 07 is set against the plate cylinder 06 or at least set up; the Printing cylinder 04 and plate cylinder 06 are preferably made of steel; the wiping cylinder 07 is on its outer surface z. B. coated with a plastic; In the preferred embodiment, the pressure cylinder 04 and the plate cylinder 06 are each divided on their circumference into several, in particular into three segments of the same size. B. a blanket is arranged or at least can be arranged on a base;

d) an employed or at least employable on the plate cylinder 06, too

Orlofylinder 08 called collecting cylinder 08; the Orlof cylinder 08 preferably has three segments of the same size on its circumference, like the impression cylinder 04 and plate cylinder 06;

e) an inking unit 09, having several, z. B. five or six stencil cylinders 11 which are respectively engaged or at least positionable on the Orlof cylinder 08, on the circumference of which a stencil plate is arranged or at least can be arranged; each of the stencil cylinders 11 ink the Orlof cylinder 08 preferably with a different printing ink, the Orlof cylinder 08 during a single revolution of the respective printing ink of all employees

Stencil cylinders 11 collects; on each stencil cylinder 1 1 one or more inking rollers 12 are employed or at least employable, the inking rollers 12 each being made up of a printing ink from a color reservoir 14, e.g. B. from a color box taking ink duct 13; the design of the printing press described here accordingly enables multi-color printing of the printed sheets 21 at a single printing point; alternatively or in addition to the inking unit 09, a coating unit can also be provided for applying a coating to the respective printed sheets 21;

f) a z. B. as a revolving conveyor belt or as a revolving

Chain system, in particular chain gripper system designed transport device 16, to which printed sheets 21 printed in a printing gap 17 between the printing cylinder 04 and the plate cylinder 06 directly or via at least one Intermediate cylinder 36; 37 are transferred, whereby to the transport device 16 transferred printing sheet 21 by means of this z. B. designed as a multi-stack delivery 18, here sheet delivery 18, transported or at least transportable and stored there or at least can be stored; In Fig. 1, the sheet delivery 18 in the transport direction T of the printed sheet 21 z. B. three consecutive stacks; in the field of

Transport device 16 is usually a z. B. arranged optoelectronic, preferably camera-based inspection system 19, by means of which a quality of the printed printed sheets 21 is checked or at least can be checked; the printed sheets 21 are checked in particular for freedom from errors in comparison with a predetermined template; depending on this test result the

Printed sheets 21 are then placed on a specific stack of the multi-stack delivery.

To achieve the highest possible printing speed of z. B. 10,000

To achieve printing sheets 21 per hour, the printing ink applied to the printing sheets 21 and / or the lacquer applied to the printing sheets 21 are preferably dried. Non-running, ie viscous printing inks and / or lacquers are preferably used. In the preferred embodiment, radiation-curing printing inks and / or lacquers are used. In a particularly preferred embodiment, solvent-free printing inks and / or lacquers curable by an electron beam are used. Such printing inks and / or lacquers polymerize when irradiated with an electron beam within milliseconds and are thus dried in an extremely short time. A color film or lacquer film consisting of such printing inks and / or lacquers is completely polymerized and is therefore also fully hardened, so that after drying in the printing inks or lacquers no fragments or

Cleavage residues remain that could migrate elsewhere through the substrate 21. Printing inks or varnishes dried by an electron beam form an elastic, glossy color film or varnish film, each of which is highly resistant to scratches and chemicals.

However, a problem with a drying method using an electron beam is that the drying, i.e. H. the setting reaction must take place in an oxygen-reduced, inert atmosphere in which to achieve a high

Production quality the oxygen content is at most 1%, preferably in a range between 300 ppm and 500 ppm, in particular in the range between 150 ppm and 250 ppm, possibly even lower to the range of less than 50 ppm, the permissible in the inert atmosphere Oxygen content depends on the material of the substrate 21 used and / or on the chemical composition of the printing ink (s) or lacquers used. Otherwise, ie with a higher oxygen content, free radicals contained in the still liquid printing inks or varnishes, i.e. H. Atoms or groups of atoms, each containing a free electron, react chemically faster with the oxygen molecules contained in this air than with each other and only form an incomplete, uneven crosslinking. This is particularly true under normal ambient air with an oxygen content of around 21%. In an atmosphere with an oxygen content of more than 1%, especially under ordinary ambient air, the setting reaction leads to the printing inks or varnish still being wet, sticky and without gloss and over bad

Adhesion properties and only low scratch resistance.

Good drying results are achieved in a drying unit 22 with an atmosphere reduced to an oxygen content of at most 1%, in which an inert, ie a chemically very inert gas, e.g. B. an elementary gas such as nitrogen or a noble gas such as helium, neon, argon, krypton, xenon or radon or a gaseous molecular compound such as sulfur hexafluoride and carbon dioxide displaces the oxygen contained in the air. An inert gas prevents oxidative processes due to the displacement or significant reduction of oxygen. The term "atmosphere" is used here and in the following - as far as the volume of the Related to drying unit 22 - holistically refers to the gaseous medium which is reduced in oxygen by the inert gas and which is present in drying unit 22 in a space provided for drying the printing inks or the lacquer.

Fig. 2 illustrates the principle of action of radiation drying with an electron beam. Even if the examples described below primarily relate to the drying of printing inks, they also apply in a corresponding manner to the drying of lacquers. A drying unit 22 that can be used in connection with a printing press, in particular with the printing press described above by way of example, has a drying unit 22 that is separated from substrate 21, e.g. B. the printed sheet 21 filled with an inert gas or containing at least one inert gas chamber 23, wherein at the entrance to the chamber 23, at which the printed sheets 21 are introduced into the chamber 23 containing the inert gas, for. B. a doctor nozzle 24 is arranged in particular in the form of a nozzle bar in order to prevent the inert gas from escaping from the chamber 23 at this inlet and / or oxygen from the ambient air entering this chamber 23.

Due to the flatness of the printed sheets 21, the entrance to the chamber 23 is generally designed as a narrow slot extending transversely to the transport direction T of the printed sheets 21 over their entire width. To fill the chamber 23 with the inert gas, for. B. with nitrogen, and / or to maintain the desired level, if necessary, an inert gas inlet into the chamber 23, in particular remotely operable filling nozzle 26 is provided, this filling nozzle 26 to an inert gas source, for. B. is connected to a tank. Furthermore, a sensor 27 for measuring the oxygen content in the chamber 23 containing the inert gas is preferably provided. The filling nozzle 26 is preferably controlled or at least controllable as a function of a measurement result from the sensor 27 for measuring the oxygen content in the chamber 23 containing the inert gas with regard to the inlet of inert gas into the chamber 23. Accordingly, if in each case in the chamber 23 of the drying unit 22 there is a filling nozzle 26, which is connected to the inert gas source, in particular can be operated remotely Sensor 27 are provided for measuring the oxygen content present in this chamber 23, then the oxygen content in the inert atmosphere prevailing in this chamber 23 is advantageously, for. B. from a control unit in particular automatically, depending on a measurement result of the sensor 27 for measuring the oxygen content and / or depending on the material of the to be dried

Printing sheet 21 and / or depending on the chemical composition of at least one printing ink or lacquer applied to the printing sheet 21 adjusted or at least adjustable.

The drying unit 22 has an electron beam generator 28, which is arranged in a vacuum chamber 29. The vacuum chamber 29 and the chamber 23 filled with the inert gas are spatially separated from one another by a window. The window has a closure 31 z. B. from a titanium foil in a material thickness in the range of z. B. 0.01 mm and 0.3 mm, preferably at about 0.2 mm. The electron beam generator 28 has a cathode 32 z. B. in the form of a filament and an anode 33 spaced from the cathode 32. Electrons emerging from the cathode 32 are accelerated to almost the speed of light by an electrical voltage applied between the cathode 32 and the anode 33 in the direction of the anode 33. The electrical voltage for accelerating the electrons is dependent on a nature, e.g. B. chemical composition of the printing inks used and / or the desired depth of penetration into these printing inks and / or of the material of the substrate 21 used in the area z. B. between 80 keV and 300 keV. The so accelerated high-energy electrons penetrate the z. B. from the thin titanium foil closure 31 of the window and preferably meet in

Essentially perpendicular to the printed sheets 21 in the chamber 23 containing the inert gas. The high-energy electrons are, so to speak, shot into the printing inks applied to the substrate 21.

When these electrons strike the substrate 21 in a layer thickness of e.g. B. about 0.1 mm applied inks and when the electrons penetrate into This color layer triggers a chemical chain reaction in these printing inks, in which short-chain acrylate molecules contained in the printing inks combine to form long-chain polymers, as a result of which a hardened color layer is formed in fractions of a second. The substrate 21 is not heated. Because the energy of the

Electron beam generator 28 electrons shot onto the substrate 21 is large enough to generate the first radicals in the printing inks and polymerize directly in the monomers (thinners) or oligomers (binders) of these

To initiate inks, it is not necessary to use the inks used

Add photo initiators as it is e.g. B. would be required for a UV drying process.

Oligomers used in inks suitable for an intaglio printing process include e.g. B. epoxy acrylates, acrylated oils, urethane acrylates, polyester acrylates, silicone acrylates, acrylated amines, acrylic-saturated resins and acrylic acrylates.

Because of the high viscosity of most oligomers, diluents are required to reduce the overall viscosity of an electron beam curing ink and thereby aid in the handling and use of these inks, e.g. B. make these inks suitable for wiping on the plate cylinder 06 by the wiping cylinder 07. Suitable diluents can include water or "reactive" monomers incorporated into the ink in question. Reactive monomers are typically acrylates or methacrylates and can be monofunctional or multifunctional. Examples of multifunctional monomers would be polyester acrylates or polyester methacrylates, polyol acrylates or polyomethacrylates and polyether acrylates or polyether methacrylates.

The following are some examples of the respective composition of layers

Printing inks or varnishes, each of which can be dried using an electron beam: example 1

Product name Manufacturer chemical name / proportion /% by weight further specification

Ebecryl ™ 83 (Eb 83) Cytec Surface Polyether Acrylate Oligomer 60

Specialties

TPGDA Rahn or Sartomer Tri propyleng lycoldiacrylat 35

Darocur® 1 173 Ciba Specialty 2-Hydroxy-2-methyl-1- 5

Chemicals phenyl-propan-1-one

Example 2

Ebecryl ™ 270 (Eb 270) Cytec Surface

Specialties urethane acrylate oligomer (aliphatic) 25

Ebecryl ™ 265 (Eb 265) Cytec Surface Urethane Acrylate Oligomer (aliphatic, 30th

Specialties trifunctional)

Genomer 1122 Rahn urethane acrylate (monofunctional) 40

Darocur® 1173 Ciba Specialty 2-Hydroxy-2-methyl-1-phenyl-5

Chemicals propan-1-one

Example 3

Ebecryl ™ 130 (Eb 130) Cytec Surface Tricyclodecanedimethanol Diacrylate 25.0

Specialties Sartomer 238 (HDDA) Sartomer 1, 6-hexanediol diacrylate 10.0

Miramer 600 (DPHA) Rahn Dipentaerithritholhexacrylate 5.0

Ebecryl ™ 220 (Eb 220) Cytec Surface Urethane Acrylate Oligomer (Aromatic, 40.0

Specialties hexafunctional)

Ebecryl ™ 83 (Eb 83) Cytec Surface Polyether Acrylate Oligomer 11, 8

Specialties (multifunctional)

Darocur® 1173 Ciba Specialty 2-Hydroxy-2-methyl-1-phenyl- 8.0

Chemicals propan-1-one

Irgacure ™ 369 (IR 369) Ciba Specialty 2-benzyl-2-dimethylamino-1- 0.2

Chemicals (4-morpholinophenyl) butanone

Example 4

Cyracure ™ UVR-6110 Dow Chemical epoxy resin (cycloaliphatic) 77.0

Company

Castor Oil Gustav Heess castor oil 1 1, 0

Oleochemical

Products GmbH

n-propanol OXEA Germany n-propanol 5.0

UVI-6992 Dow Chemical blend of 7.0

Company triarylsulfonium hexafluorophosphate salts and propylene carbonate

Example 5

Cyracure ™ UVR-6110 Dow Chemical epoxy resin (cycloalipathic) 81, 0

Company UVI-6992 Dow Chemical blend of 9.0

Company triarylsulfonium hexafluorophosphate

Salts and propylene carbonate

DVE-3 BASF Corporation triethylene glycol divinyl ether 10.0

Example 6

Cyracure ™ UVR-6128 Dow Chemical epoxy resin (cycloaliphatic) 69.0

Company

UVI-6992 Dow Chemical blend of 4.0

Company triarylsulfonium hexafluorophosphate salts and propylene carbonate

TONE ™ 0305 Dow Chemical Polyol (trifunctional) 27.0

Company

Example 7

Cyracure ™ UVR-6110 Dow Chemical epoxy resin (cycloalipathic) 60.0

Company

TMPO® Perstorp Specialty Trimethylolpropanoxetan 20.0

Chemicals AB

Boltorn H2004 Perstorp Specialty dendritic polymer with high 16.0

Chemicals AB Hyd roxylfu ntional ität

Irgacure® 250 Ciba Specialty Idonium, (4-methylphenyl) [4- 3.5

Chemicals (2-methylpropyl) phenyl] -,

hexafluorophosphate

Genocure ™ ITX Rahn Isopropylthioxanthone 0.5 To carry out radiation drying of printing inks or lacquers applied to a substrate 21, in each case with an electron beam, in a printing press for the industrial production of banknotes, security documents or

Security elements are now described below some arrangement variants. In all of these arrangement variants, the drying unit 22 has one

Electron beam generator 28, by means of which high-energy electrons are shot onto the substrate 21.

A first arrangement variant provides for the entire printing press to be arranged in a housing which is sealed with respect to the ambient air, an inert atmosphere with an oxygen content of at most 1% being provided in the interior of the housing. The chamber 23 of the drying unit 22 which contains the inert gas is in this case realized by housing the printing press. The printed sheets 21 to be printed are fed to the printing press through an inlet lock formed on the housing and discharged from the printing machine through an outlet lock formed on the housing. The drying unit 22 is at this first

Arrangement variant at any point in the transport direction T of the substrates 21, which are in each case in the form of printing sheets 21, is arranged after the printing gap 17 formed by printing cylinder 04 and plate cylinder 06, for. B. also on or in the transport direction T of the printed sheet 21 after that transport device 16, which is arranged in the transport direction T of the printed sheet 21 after the printing unit 03 and z. B. is designed as a circulating conveyor belt or as a circulating chain system or as a chain gripper system.

A second arrangement variant provides for the drying unit 22 to be arranged in the printing unit 03 of the printing press. The chamber 23 containing the inert gas

Drying unit 22 is arranged in the printing unit 03 such that at least one Arc section of the pressure cylinder 04 is arranged within this chamber 23.

Fig. 3 shows a section of the printing press shown in Fig. 1, with an arc section of the printing cylinder 04 and an arc section of the same

Pressure cylinder 04 cooperating plate cylinder 06 are arranged within the chamber 23 containing the inert gas. A preferably flexible seal 34 is arranged on the chamber 23 containing the inert gas, which seals this chamber 23 on the respective end faces of the pressure cylinder 04 and plate cylinder 06 and on the outer surface of the plate cylinder 06 and, if appropriate, on the pressure gap 17 formed by the pressure cylinder 04 and plate cylinder 06 and seals against the ambient air at an outlet from the chamber 23 on the dried substrate 21 resting on the outer surface of the rotating printing cylinder 04. It is noteworthy here that the printing cylinder 04 and the plate cylinder 06 are set against one another under high pressure in the printing gap 17 formed by them in a printing process carried out by the printing press in question, and the cylinders 04; 06 in the pressure gap 17 formed by them already one axially to these cylinders 04; 06 form a running seal for the chamber 23 containing the inert gas. Substrates 21, in particular printing sheets 21, dried by means of the drying unit 22 are transferred from the printing cylinder 04 to the printing cylinder 04 in the transport direction T

Transfer printing sheet 21 subsequent transport device 16.

FIG. 4 likewise shows a section of the printing press shown in FIG. 1, only one arc section of the printing cylinder 04 being arranged inside the chamber 23 containing the inert gas. Arranged on the chamber 23 containing the inert gas is a preferably flexible seal 34, which seals this chamber 23 against the ambient air at the end faces of the pressure cylinder 04 and at an outlet from the chamber 23 on the dry substrate 21 resting on its outer surface. At the entrance of the chamber 23, a narrow slot is formed which extends transversely to the transport direction T of the substrate 21 over its entire width, through which slot a substrate 21 resting on the outer surface of the printing cylinder 04 is introduced into the chamber 23 of the drying unit 22, or at least can be inserted, a doctor nozzle 24, in particular in the form of a nozzle bar, being arranged along this slot, in order to prevent this At the entrance, the inert gas escapes from the chamber 23 and / or oxygen from the ambient air enters this chamber 23. Also in this embodiment, the

Drying unit 22 transfers dried substrates 21, in particular printing sheets 21, from the printing cylinder 04 to a transport device 16 following the printing cylinder 04 in the transport direction T of the printing sheets 21.

FIG. 5 also shows a section of the printing press shown in FIG. 1, in contrast to the embodiment shown in FIG. 1 in the

Printing gap 17 between printing cylinder 04 and plate cylinder 06 printed printing sheets 21 via two intermediate cylinders 36 arranged one after the other in transport direction T of printing sheets 21; 37 are transferred to the transport device 16. In a third arrangement variant it is provided that the drying unit 22 is connected to one of the intermediate cylinders 36; 37 is arranged. A preferably flexible seal 34 is in turn arranged on the chamber 23 containing the inert gas, which seals this chamber 23 on the end faces of the relevant intermediate cylinder 36; 37 and at an outlet from chamber 23 on the outer surface of the relevant

Intermediate cylinder 36; 37 overlying dry substrate 21 against each

Seals ambient air. At the entrance to chamber 23 is a cross

Transport direction T of the substrate 21 formed over its entire width narrow slot, through which a slot on the outer surface of the relevant intermediate cylinder 36; 37 overlying substrate 21 in the chamber 23 of the

Drying unit 22 is introduced or is at least insertable, a doctor nozzle 24, in particular in the form of a nozzle bar, being arranged along this slot in order to prevent the inert gas from escaping from the chamber 23 and / or oxygen from the ambient air into this chamber at this inlet 23 occurs. As exemplified in FIG. 6, is as a fourth arrangement variant

provided that the drying unit 22 on or at least in connection with the z. B. is arranged as a conveyor belt formed transport device 16. A preferably flexible seal 34 is in turn arranged on the chamber 23 containing the inert gas, which seals this chamber 23 at the exit from the chamber 23 on the dry substrate 21 transported by the transport device 16 against the ambient air. At the entrance to the chamber 23, a narrow slot is formed which extends across the entire width of the substrate T and extends through its slot, through which slot a substrate 21 transported by the transport device 16 is introduced into the chamber 23 of the drying unit 22 or at least can be inserted, whereby along this slot a doctor nozzle 24 in particular in the form of a

Nozzle bar is arranged to prevent the inert gas from escaping from the chamber 23 and / or oxygen from the ambient air entering this chamber 23 at this inlet.

As shown on the basis of the second to fourth arrangement variants, the drying unit 22 having a chamber 23 containing the inert gas can, for. B. in the printing unit 03 of the printing press or on an intermediate cylinder 36 arranged in the transport direction T of the substrates 21 after the printing unit 03; 37 or on which the transport device 16 transporting the substrates 21 to a delivery 18 can be arranged.

7 and 8 schematically show examples of different configurations of the

Drying unit 22 for electron beam curing. 7 shows one to one

Suction cylinder 38 employed drying unit 22 for electron beam hardening, the suction cylinder 38 having a special configuration, for. B. the pressure cylinder 04 or an intermediate cylinder 36; 37 and can have at least one arc section located within the chamber 23 of the drying unit 22. A first one immediately upstream of the suction cylinder 38 in the transport direction T of the substrates 21 Transport device z. B. in the form of a conveyor belt, in particular a preferably a suction box 41 having suction belt 39, or a cylinder or a roller leads printed substrates 21 to the suction cylinder 38 sequentially, the suction cylinder 38 in succession on its lateral surface several, for. B. can accommodate three substrates 21, in particular designed as printed sheets 21. Substrates 21 supplied to the suction cylinder 38 are held on its outer surface by suction air. When the suction cylinder 38 continues to rotate, the printed substrates 21 are guided into the chamber 23 of the drying unit 22 through a narrow slot extending transversely to the transport direction T of the substrates 21 over their entire width. In the drying unit 22 is the

Electron beam generator 28 which dries the printed substrates 21 by bombardment with high-energy electrons in the manner described above. The dry substrates 21 resting on the outer surface of the rotating suction cylinder 38 leave the drying unit 22 at the outlet of the chamber 23, the outlet of the chamber 23 being designed as a narrow slot extending transversely to the transport direction T of the substrates 21 and preferably through one in particular flexible seal 34 is sealed. In the direction of rotation of the suction cylinder 38 and thus in the transport direction T of the substrates 21, a second transport device z. B. again in the form of a

Conveyor belt, in particular a suction belt 42 preferably having a suction box 43, or a cylinder or a roller, which the dried substrates 21 z. B. transported to a display 18.

As can be seen from FIG. 7, two separate pneumatic systems are provided in this embodiment variant. The first pneumatic system uses a pump 44 and usually via corresponding lines z. B. on the suction cylinder 38 and / or on the suction box 41 of the suction belt 39 of the first transport device and / or on the suction box 43 of the suction belt 42 of the second transport device, the suction air required in each case for holding the substrates 21 to be transported Available. The second pneumatic system has an inert gas source z. B. in the form of a tank 46 to provide the required by the drying unit 22

Inert gas, wherein preferably the filling nozzle 26 arranged on the chamber 23 of the drying unit 22 and introducing inert gas into the chamber 23 is connected to this tank 46. Furthermore, the second pneumatic system has a z. B. with the suction cylinder 38 and on the output side connected to the tank 46 pump 47 to a substrate 21 which on the inside of the chamber 23 of the

Drying unit 22 located arc section of the suction cylinder 38 is arranged to hold on the outer surface of this suction cylinder 38 by suction. In this respect, the second pneumatic system also generates suction air, the suction air used in the second pneumatic system being inert, which is significantly reduced in oxygen compared to the ambient air usually used by the first pneumatic system

Has atmosphere with an oxygen content of preferably at most 1%. It is advantageously provided that the first pneumatic system and the second pneumatic system are formed separately from one another, the first

Pneumatic system on the suction cylinder 38 provides the suction air required to hold the substrates 21 to be transported if a substrate 21 held on the outer surface of the suction cylinder 38 is outside the chamber 23 of the

Drying unit 22 is located, and that the second pneumatic system

provides the necessary suction air for holding the substrates 21 to be transported at least when the substrate 21 held on the outer surface of the suction cylinder 38 is inside the chamber 23 of the drying unit 22.

In a further embodiment it is provided that, for. B. only a single pneumatic system is provided, the same gaseous medium as in the chamber 23 of the drying unit 22 for the suction air required to hold the substrates 21 to be transported on the outer surface of the suction cylinder 38, in particular during their entire residence time on the suction cylinder 38 in question

provided. This results in z. B. a rotary printing press with at least a printing unit 03 for printing on substrates 21, the relevant one

Printing unit 03 at least two interacting cylinders 04; 06, at least one of these cylinders 04; 06 is designed as a suction cylinder transporting the substrates 21 on its outer surface, a pneumatic system for providing the necessary suction air for holding the on the outer surface of the relevant cylinder 04; 06 substrates 21 to be transported is provided. A drying unit 22 is provided in or after the relevant printing unit 03 in the transport path of the substrates 21, substrates 21 printed by the printing unit 03 in question being guided or at least feasible through a chamber 23 of this drying unit 22, with a drying unit 22 in the chamber 23 oxygen-reduced gaseous medium is provided by an inert gas. In an advantageous embodiment, the suction air provided in the pneumatic system for holding the substrates 21 to be transported on the lateral surface of the relevant suction cylinder is the same gaseous medium as in the chamber 23 of the drying unit 22. Preferably, one of the cylinders 04 interacting in the relevant printing unit 03 are one printing cylinder 04 and the other cylinder 06 cooperating with the printing cylinder 04 are designed as a plate cylinder 06 applying a print image to the substrates 21 in question. In the very preferred embodiment, the printing unit 03 in question is designed as a printing unit 03 printing in a gravure printing process, in particular in an intaglio printing process.

Fig. 8 shows an embodiment of the drying unit 22 for electron beam curing, in which for the transport of the substrates 21 through the chamber 23 of the drying unit 22 in a vacuum chamber 29 having the electron beam generator 28 partially, for. B. semicircular enclosing housing 49 along the transport path of the substrates 21, a plurality of suction rollers 48 are provided, these suction rollers 48 conveying substrates 21 introduced by their respective rotation into the chamber 23 of the drying unit 22 from an inlet of the chamber 23 to the outlet thereof. The electron beam generator 28 is e.g. B. in or near the center of the drying unit 22 arranged in a stationary manner and has a radially outwardly directed electron beam, substrates 21 to be dried each having the printed side thereof

Electron beam generator 28 facing at least partially along its transport path, e.g. B. in a semicircle in an arc around which the electron beam generator 28 having vacuum chamber 29 are or will be. The suction rollers 48 arranged along the transport path of the substrates 21 are each arranged on the side of the substrates 21 not to be dried, which are to be conveyed through the chamber 23 of the drying unit 22. The entrance of the chamber 23 and its exit are preferably each formed as a narrow slot extending transversely to the transport direction T of the substrates 21 over their entire width. A first transport device arranged in the transport direction T of the substrates 21 immediately before the entrance to the chamber 23 is e.g. B. in the form of a conveyor belt, in particular a suction belt 39 preferably having a suction box 41, or a cylinder or a roller and supplies printed substrates 21 to the chamber 23 of the drying unit 22 sequentially. In the transport direction T of the substrates 21, a second transport device z. B. again in the form of a conveyor belt, in particular a suction belt 43 preferably having a suction box 43, or a cylinder or a roller, which the dried substrates 21 z. B. transported to a display 18.

In the embodiment variant according to FIG. B. again two separate pneumatic systems are provided. The first pneumatic system provides a pump 44 and corresponding lines z. B. on the suction box 41 of the suction belt 39 of the first transport device and / or on the suction box 43 of the

Suction belt 42 of the second transport device, the suction air required in each case for holding the substrates 21 to be transported. The second pneumatic system has an inert gas source z. B. in the form of a tank 46 for providing the inert gas required by the drying unit 22, wherein the filling nozzle 26 arranged in the chamber 23 of the drying unit 22 and inert gas entering the chamber 23 is connected to this tank 46. Furthermore, the second pneumatic system z. B. a pump 47 connected on the inlet side to the suction rollers 48 and on the outlet side to the tank 46, a substrate 21, which is conveyed through the suction rollers 48 on the transport path located within the chamber 23 of the drying unit 22, caused by a pump 47 Suction is kept on the intended transport route.

Since the provision of an inert gas, e.g. B. of nitrogen, in an industrial production process integrated drying unit 22 for electron beam curing is associated with considerable costs, the intended for the substrates 21 input into the chamber 23 of the drying unit 22 and / or the output from this chamber 23 each z. B. slit-shaped and / or z. B. by a doctor nozzle 24 in particular in the form of a nozzle bar or by a preferably flexible

Seal 34 sealed.

A further measure for minimizing the escape of the oxygen-reduced gaseous medium, in particular inert gas from the chamber 23 and / or an undesired entry of oxygen from the ambient air into this chamber 23, consists of channels 51 or grooves 51 which connect the chamber 23 to the one

Drying unit 22 at least partially, e.g. B. in an arc section cylinder, z. B. on a pressure cylinder 04 or on a plate cylinder 06 or on an intermediate cylinder 36; 37 or are formed on a suction cylinder 38, each with a cover. If at least one gripper for holding a substrate 21 is arranged on the respective lateral surface of the relevant cylinder in such a way that at least one gripper for holding a substrate 21 is arranged transversely to the transport direction T of the substrates 21, the cover covering this duct 51 has the position of the gripper in question a recess. With regard to the tightness of the chamber 23 of the drying unit 22, it is advantageous, however, that the cylinders 04; 06; 36; 37; 38 each without a gripper, ie without a mechanical one Train grippers or in the case of interacting cylinders 04; 06 like that

Printing cylinder 04 and the plate cylinder 06 at least one of these cylinders 04; 06 training without a gripper. On cylinders 04; 06; 36; 37; 38, substrates 21 to be arranged on their respective lateral surfaces are preferably held only by suction air. Likewise, it is also advantageous to design a transport device 16 designed as a transport belt for transporting substrates 21 without a gripper.

Thus there is z. B. a rotary printing press with at least one printing unit 03 for printing on substrates 21, a drying unit 22 being provided in or after the at least one printing unit 03 in the transport path of the substrates 21, substrates 21 printed by the at least one printing unit 03 through a chamber 23 thereof Drying unit 22 are guided or at least feasible, wherein in the chamber 23 of the drying unit 22 an atmosphere reduced by an inert gas is provided, the chamber 23 of the drying unit 22 at least one arc section from a cylinder 04 transporting the substrates 21 to be dried; 06; 36; 37; 38 encloses, this cylinder 04; 06; 36; 37; 38 in a channel 51 extending transversely to the transport direction T of the substrates 21, at least one gripper for holding one of the substrates 21 on the lateral surface of the relevant cylinder 04; 06; 36; 37; 38, the channel 51 in question being covered by a cover, the cover having a recess at the location of the gripper in question, the cylinder 04; 06; 36; 37; 38 on its outer surface in addition to the at least one gripper, at least one further holding element for holding the relevant substrate 21 on the outer surface of the relevant cylinder 04; 06; 36; 37; 38 has.

Alternatively, z. B. a rotary printing press with at least one printing unit 03 for printing on substrates 21, a drying unit 22 being provided in or after the at least one printing unit 03 in the transport path of the substrates 21, substrates 21 printed by the at least one printing unit 03 are guided or at least feasible through a chamber 23 of this drying unit 22, an atmosphere reduced in oxygen by an inert gas being provided in the chamber 23 of the drying unit 22, the chamber 23 of the drying unit 22 having at least one arc section from a cylinder 04; transporting the substrates 21 to be dried; 06; 36; 37; 38 encloses, this cylinder 04; 06; 36; 37; 38 is designed without a gripper.

A special design variant is e.g. B. in a rotary printing press with at least one printing unit 03 for printing on substrates 21, wherein in

Transport path of the substrates 21 in or after the at least one printing unit 03, a drying unit 22 is provided, substrates 21 printed by the at least one printing unit 03 being guided or at least feasible through a chamber 23 of this drying unit 22, one in the chamber 23 of the drying unit 22 an oxygen-reduced atmosphere is provided by an inert gas, a plurality of suction rollers 48 being arranged in the chamber 23 of the drying unit 22 along the transport path of the substrates 21, the suction rollers 48 conveying the substrates 21 through this chamber 23 through their respective rotation.

A concrete variant is also z. B. given by a sheet printing machine with at least one printing unit 03 for printing printed sheets 21, wherein in the transport path of the printing sheets 21 in or after the at least one printing unit 03 a drying unit 22 is provided, printed sheets 21 printed by the at least one printing unit 03 through a chamber 23 of this drying unit 22 are guided or at least feasible, an atmosphere reduced in oxygen by an inert gas being provided in the chamber 23 of the drying unit 22, the

Drying unit 22 has an electron beam generator 28 for drying the printed printed sheets 21 by means of an electron beam directed into the chamber 23, the atmosphere in the chamber 23 of the drying unit 22 having an oxygen content of at most 1%.

Furthermore, there is z. B. a gravure printing machine with at least one printing unit 03 for printing printed sheets 21, wherein in the printing unit 03 in question a printing cylinder 04 and a plate cylinder 06 cooperating with this printing cylinder 04 are arranged, with a wiping cylinder 07 positioned or at least adjustable against the plate cylinder 06 being provided , in the transport path of the printed sheet 21 in or after the at least one printing unit 03 a

Drying unit 22 is provided, wherein printed sheets 21 printed by the at least one printing unit 03 are guided or at least can be guided through a chamber 23 of this drying unit 22, the drying unit 22 being an electron beam generator 28 for drying the printed printed sheets 21 by means of one directed into the chamber 23 Has electron beam.

Further refinements and / or developments of the aforementioned printing machines result from each sensible and thus contradictory combination of the features described above by way of example.

Fig. 9 now shows a variant which is particularly suitable for retrofitting in a printing press. This embodiment variant affects one

Drying unit 22 for drying printed substrates 21, each formed as a printed sheet 21, with a chamber 23 containing a gaseous medium, the gaseous medium contained in the chamber 23 being oxygen-reduced by an inert gas. This drying unit 22 forms in the preferred

Embodiment an independent unit, which can also be added later

can in particular be introduced into a printing press in the transport path of the printed substrates 21. The substrates 21 to be dried are guided through the chamber 23 of this drying unit 22 or at least can be guided. The chamber 23 has a preferably slot-like shape in the transport direction T of the substrates 21 transversely to the transport direction T of the substrates 21, the entrance for the substrates 21 to be led into this chamber 23, the entrance for the substrates 21 to be led into the chamber 23 through a nip 17 between two cylinders 04; 06 is formed. The respective direction of rotation of these two cylinders 04; 06 is indicated in FIG. 9 by an arrow indicating the direction of rotation. Advantageously, the two form

opposed cylinder 04; 06 at this inlet of the chamber 23 a seal against the escape of the oxygen-reduced gaseous medium, in particular of inert gas from this chamber 23 and / or against the entry of oxygen from the ambient air into this chamber 23. For drying the printed substrates 21, there is preferably an electron beam generator 28 in the drying unit 22 with one directed in the chamber 23 onto the substrates 21

Electron beam provided. Especially in the latter embodiment i. V. m. an electron beam generator 28 has the atmosphere, i. H. the gaseous medium in the chamber 23 - as already described above - has an oxygen content of at most 1%. The chamber 23 of this drying unit 22 in the transport direction T of the substrates 21 also has, in turn, a preferably slot-shaped outlet, which extends transversely to the transport direction T of the substrates 21, for the substrates 21 guided through this chamber 23, at this outlet as a seal against each other Escaping the oxygen-reduced gaseous medium, in particular inert gas from this chamber 23 and / or against the entry of oxygen from the ambient air into this chamber 23, a preferably flexible seal 34 and / or a doctor nozzle 24 is or are arranged.

In an advantageous development, the two cylinders 04; 06 at the entrance to the chamber 23, a printing unit 03 is formed, one of the cylinders 04 being designed as a printing cylinder 04 and the other cylinder 06 being designed as a plate cylinder 06 which cooperates with the printing cylinder 04 and applies a print image to the substrates 21 in question. This is at the entrance to chamber 23 Drying unit 22 trained printing unit 03 z. B. as a printing in a gravure printing process, in particular in an intaglio printing process

Printing unit 03 trained.

A transport device 16 is advantageously provided, the

Transport device 16 is arranged to lead the substrates 21 through the chamber 23, the transport device 16 being designed as a preferably rotating conveyor belt or as a preferably rotating chain system, in particular as a chain gripper system. It can also be provided that at least one of the two cylinders 04; 06 is designed as a suction cylinder. Alternatively or additionally, e.g. B. at least one of the two cylinders 04; 06 in a channel 51 extending transversely to the transport direction T of the substrates 21, at least one gripper for holding one of the substrates 21 on the lateral surface of the relevant cylinder 04; 06 on. The channel 51 in question is preferably covered with a cover, the cover having a recess at the location of the gripper in question.

Reference symbol list

01 sheet feeder

02 bow system

03 printing unit

04 pressure cylinder; cylinder

05 -

06 plate cylinder; cylinder

07 wiper cylinder

08 collecting cylinder; Orlof cylinder 09 inking unit

10th

1 1 template cylinder

12 inking roller

13 color guide

14 color reservoir

15 -

16 Transport device

17 pressure gap; Nip

18 display; Sheet delivery

19 inspection system

0

1 substrate; Printed sheet

2 drying unit

3 chamber filled with an inert gas 4 doctor blade nozzle

5 - 6 filling nozzle

7 sensor for oxygen measurement Electron beam generator vacuum chamber

- closure

cathode

anode

poetry

- intermediate cylinder

Intermediate cylinder

Suction cylinder

Suction belt

- suction box

Suction belt

Suction box

pump

- tank

pump

Suction roll

casing

- Channel; Groove

Direction of transport

Claims

Expectations

1. Rotary printing press with at least one printing unit (03) for printing on substrates (21), a drying unit (22) being provided in or after the at least one printing unit (03) in the transport path of the substrates (21), of which at least one printing unit (03) printed substrates (21) are guided or at least can be guided through a chamber (23) of this drying unit (22), the chamber (23) of the drying unit (22) containing a gaseous medium which is reduced in oxygen by an inert gas, the chamber (23 ) of the drying unit (22) encloses at least one arc section by a cylinder (04; 06; 36; 37; 38) transporting the substrates (21) to be dried, the at least one of the chamber (23) of the drying unit (22) at least in cylinders (04; 06; 36; 37; 38) enclosed in an arc section are each designed as a suction cylinder (38), characterized in that two pneumatic systems are provided, a first pneumatic cal system on the suction cylinder (38) the suction air required to hold the

transporting substrates (21) available when one on the

The lateral surface of the substrate (21) held by the suction cylinder (38) is located outside the chamber (23) of the drying unit (22), and a second pneumatic system separate from the first pneumatic system provides the necessary suction air for holding the substrates (21) to be transported , when the substrate (21) held on the outer surface of the suction cylinder (38) is inside the chamber (23) of the drying unit (22).

2. Rotary printing machine according to claim 1, characterized in that the cylinder (04; 06; 36; 37; 38) enclosed by the chamber (23) of the drying unit (22) at least in an arc section is arranged as one in the relevant printing unit (03) Printing cylinder (04) or plate cylinder (06) is formed.

3. Rotary printing machine according to claim 1, characterized in that the rotary printing machine is designed as a sheet-fed printing machine and / or that the cylinder (04; 06; 36; 37; 38) enclosed by the chamber (23) of the drying unit (22) at least in one sheet section ) is designed as an intermediate cylinder (36; 37), the intermediate cylinder (36; 37) connecting the dried substrates (21) to one of these substrates (21) to form a sheet delivery (18)

transporting transport device (16) is arranged to transfer.

4. Rotary printing machine according to claim 1 or 2 or 3, characterized in that the at least one printing unit (03) is designed as a printing unit (03) printing the substrates (21) in each case in a gravure printing method, in particular in an intaglio printing method.

5. Rotary printing machine according to claim 1 or 2 or 3 or 4, characterized

characterized in that the suction air for holding the substrates (21) to be transported on the outer surface of the relevant suction cylinder (38) is the same gaseous medium as in the chamber (23) of the drying unit (22) if this is on the outer surface of the suction cylinder (38 ) held substrate (21) inside the chamber (23) of the drying unit (22).

6. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5, characterized in that the drying unit (22) has an electron beam generator (28) for drying the printed substrates (21) by means of an electron beam directed into the chamber (23) .

7. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that the chamber (23) of the drying unit (22) has an inlet and an outlet for the substrates (21) to be passed through it, the inlet and / or the output each as a cross to Transport direction (T) of the substrates (21) is or are formed over their entire width.

8. Rotary printing machine according to claim 7, characterized in that the

Chamber (23) of the drying unit (22) at its inlet and / or at its outlet in each case through a flexible seal (34) or through a doctor nozzle (24) to prevent the oxygen-reduced gaseous medium from escaping from this chamber (23) and / or entry of oxygen from the ambient air into this chamber (23) is sealed.

9. Rotary printing machine according to claim 8, characterized in that the

Squeegee nozzle (24) is designed in the form of a nozzle bar which extends along the slot-shaped inlet and / or outlet of the chamber (23).

10. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, characterized in that the gaseous medium in the chamber (23) of the drying unit (22) has an oxygen content of at most 1%.

1 1. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10, characterized in that the inert gas in the chamber (23) of the drying unit (22) is an elementary gas such as nitrogen or

Noble gas such as helium, neon, argon, krypton, xenon or radon or a gaseous molecular compound such as sulfur hexafluoride or carbon dioxide.

12. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 1 1, characterized in that the suction cylinder (38) at least one holding element for holding the relevant substrate (21) on the Has outer surface of this suction cylinder (38), the relevant one Holding element is designed as a sucker.

13. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12, characterized in that the suction cylinder (38) in a transversely to the transport direction (T) of the substrates (21) extending channel (51) has at least one gripper for holding one of the substrates (21) on the outer surface of this suction cylinder (38), the channel (51) in question being covered with a cover, the cover being in place of the relevant gripper has a recess.

14. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13, characterized in that the second pneumatic system with a chamber (23) of the drying unit (22nd ) is connected to the inert gas source supplying the inert gas.

15. Rotary printing machine according to claim 14, characterized in that the second pneumatic system has a pump (47) connected on the inlet side to the suction cylinder (38) and on the outlet side to the inert gas source.

16. Rotary printing machine according to claim 14 or 15, characterized in that in the chamber (23) of the drying unit (22) an inert gas in this chamber (23) inlet filling nozzle (26) is arranged, said filling nozzle (26) with that in the second Pneumatic system arranged inert gas source is connected.

17. Rotary printing machine according to claim 16, characterized in that

In addition to the filling nozzle (26) in the chamber (23) of the drying unit (22), a sensor (27) for measuring the oxygen content in this chamber (23) containing inert gas is provided, the filling nozzle (26) depending on a measurement result of the sensor (27) for measuring the oxygen content in it Chamber (23) containing inert gas is controlled or at least controllable by a control unit with regard to the inlet of inert gas into this chamber (23).

18. Rotary printing machine according to claim 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 1 1 or 12 or 13 or 14 or 15 or 16 or 17, characterized in that an employed on the plate cylinder (06) or at least an adjustable orl cylinder (08) is provided, with a plurality of stencil cylinders (11) of an inking unit (09) being attached or at least adjustable to the orl cylinder (08).

19. Rotary printing machine according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14 or 15 or 16 or 17, characterized in that the chamber (23) the suction unit (38) of the drying unit (22), which is enclosed in at least one arc section, is divided on its circumference into several segments, in particular into three segments of the same size.