EP2625039B1 - Rotary printing press and method for monitoring characteristic values of the printing medium which is applied to the printing material - Google Patents

Description

The invention relates to a rotary printing press and to a method for monitoring characteristic values of the pressure medium applied to the printing substrate.

Rotary printing presses have means of transport that guide the printing material through the printing press. In web presses, the web is unrolled from a first roll, slides over guide rolls to a number of inking units in which it is printed, and is wound up on a second roll.

On sheetfed presses complex facilities for transporting the sheets are available.

Printing material is subjected to printing with printing medium - often paint but also paint and other coating materials -. There is a need to determine the condition of the printing agent on the substrate. Frequently, a sample of the printed printing material is taken and examined. In particular, if the substrate is in sheet form, this work is very impractical and inevitably leads to waste, since substrate must be cut out of the substrate web. Often, the degree of drying or crosslinking of the color is in the focus of interest in these studies, since the substrate is to be stored often after printing and it can come through the post-curing of the substance to unpleasant bonds and the like.

In addition, it has been shown in packaging printing that even small quantities of residual solvent can lead to unpleasant odors especially in the pet food sector are not acceptable, since many pets have a sensitive sense of smell.

Various measuring methods are known for measuring the degree of drying of the printing substrate.

So shows, for example, the EP 1 249 346 B1 a printing machine with an optical sensor station, which is downstream of the color or printing units in the web running direction.

From the DE 197 37 785 A1 It is known to measure the degree of dryness of the printing substrate with a microwave signal.

From the EP 1 974 918 A2 It is known to measure the degree of dryness of the printing material with an ultrasonic signal, preferably with laser-induced ultrasonic waves.

From the DE 24 58 935 In addition, a method and apparatus for measuring and controlling the speed of printing and coating machines is known. In order to allow a continuous examination of the quality of the product, the wavelengths corresponding to the solvents used are analyzed quantitatively and continuously, and those on the after drying, compare the measured effective average values with the preset permissible maximum values. Based on the comparison, a signal for adjusting the production speed of the rotary machine is then sent.

However, the above-mentioned problems can not be completely solved with the known devices and methods.

Object of the present invention is therefore to achieve complete drying or curing of the printing material.

The object is achieved in each case by the feature combination contained in claims 1 and 12.

The solution according to the invention is based on the recognition that a sensor station has a first positioning body, which can be brought into contact with the printing material in the area of the applied printing means, and in that the sensors of the sensor station record measured values originating from components of printing means which are in contact with stand the at least one first Anstellkörper and / or have been removed from the at least one first Anstellkörper of the substrate.

A rotary printing machine of the kind proposed in claim 1 has a positioning body. This Anstellkörper can be employed against a surface of the printing material, which is acted upon by the pressure medium. It is important that this adjustment be made with a sensitivity that corresponds to the sensitivity of the printed image. An Anstellkörper can be formed by any type of bodies. However, bodies or devices which have a circumferential surface, such as a belt or belt surface or the circumferential surface of a roller, are advantageous. To protect the printed image, this surface can be brought to the same speed as the printing substrate, if it is running.

During its employment on the printing material of the Anstellkörper or parts of its surface gets in contact with the pressure medium and it may happen that components of the pressure medium remain at least briefly in contact with the surface of the Anstellkörpers.

According to the invention, measured values are taken from these constituents of the pressure medium. Often these measurements will be statements on the amount of constituents of the pressure medium per unit area.

As a rule, the Anstellkörper should therefore be made on the side of the pressure medium film to be examined against the pressure medium film.

Example: The remainder of the solvent (constituent of the pressure medium) should be checked in already dried ink (pressure medium). The solvent is a water or alcohol and has some electrical conductivity due to the dipole nature of its molecules. On the surface of the Anstellkörpers, a roller, fine flat tracks can be located. When solvent comes onto the roll (especially the contact surface between surface of the Anstellkörpers and pressure medium film), electrical properties of the roll surface change, such as the resistance between interconnects. Such changes in the electrical or electronic properties of the roll surface can be measured.

In particular, for the measurement of color components, which have a dielectric character, offer themselves surfaces of the Anstellkörper whose components change their capacity when they are subjected to these dielectric constituents.

Among other things, polymer coatings have become known which change their properties when they come into contact with paint components.

With comparable methods, which are disclosed below by way of example, other properties of the already printed-on printing medium film such as the degree of crosslinking z. B. polymer-containing inks.

Often after printing or inking stations web finishing stations are used, which bring the pressure medium film closer to its final state faster. Thus, for example, the web can be dried more strongly by the introduction of temperature and / or air, or it can be freed from solvents to a greater extent.

The degree of crosslinking between molecules of the color film is also one of the variables that are influenced in this context. For this purpose, high-energy radiation that can accelerate polymerization is often used.

Other finishing methods apply additional chemicals to the print substrate.

The mentioned web finishing stations have a high energy and possibly resource consumption and it is advantageous to investigate characteristic values of the pressure medium film and to regulate the activity of the web finishing stations.

The sensor station can have a plurality of first Anstellkörper, which are brought into contact with the web. It is also advantageous if, in addition to at least one first Anstellkörper second Anstellkörper are present. In this case, a transport of pressure medium components takes place via the at least one first Anstellkörper at least to the second Anstellkörper. This makes it possible, inter alia, to use different sensors and here also different types of sensors in addition to the measurements.

Example: Again printing is done with a paint containing an electrically conductive solvent (eg water or alcohol), again the amount per unit area of this solvent is determined on a first contact body by measuring how at least one electrical property of the Surface of this body changed. In the example considered here, the amount of solvent, which is per unit area on the first Anstellkörper, almost alone responsible for the change in the electrical properties of the contact surface. The color-active polymers and the blend contribute almost nothing to the overall conductivity (or reduce the conductivity if they were present in very high concentration).

A part of the pressure medium components is transferred to a second Anstellkörper. Both Anstellkörper are here rollers, the second Anstellkörper is transparent. The transmission of white light through this roller is measured. The transmission is almost exclusively determined by the color pigments, which were transferred to the second roller after two further color separations (first during printing) and the already used drying and crosslinking process. The color split is determined by the degree of crosslinking and the residual solvent concentration measured on the first roll. Therefore, it can be concluded from the concentration of the color pigments on the second roller on the degree of crosslinking of the ink film.

The already given information makes it clear that it may be advantageous in particular in areas such as packaging printing to repeatedly calibrate and replace the sensors used. Especially if the sensors are integrated into a roll surface, it may be advantageous to replace the roll or roll sleeve ("sleeve"). It is also advantageous if color is transported away from the front Anstellkörpern or if these Anstellkörper be cleaned at regular intervals. To remove the paint "color sinks" can be used. These lead the color further and remove it from the color cycle, in order to avoid an accumulation of color on the Anstellkörpern, which are relevant for the measurements.

Furthermore, it is advantageous to turn off Anstellkörper of an upstream in color transport direction Anstellkörper or the substrate itself from time to time to temporarily interrupt the color transport to a measuring point.

An objective of the above measures (color sink, cleaning, shutdown) may be to achieve a state of equilibrium for the quantity "amount of a color component per unit area of the contact surface of the Anstellkörpers" at one or more measuring points for a significant period of time (it will as much color component discharged as supplied, the amount of ink per unit area is in a traceable dependence on the state of the ink film on the substrate).

In this way, measurement errors due to the accumulation of color components at a measuring point or measured value fluctuations can be avoided.

Also advantageous are rollers or Anstellkörper that measure the temperature of the web or the pressure medium film. Thus, as an alternative or in addition to a tempering of rollers or sensor stations, the measurement can be better interpreted (eg by means of a calibration table which represents the measurement sensitivity as a function of the temperature).

Further embodiments of the invention will become apparent from the description and the claims.

Fig. 1

Skizze einer Ständermaschine

Fig. 2

Skizze einer Zentralzylindermaschine

Fig. 3

Skizze einer ersten Sensorstation

Fig. 4

Skizze einer zweiten Sensorstation

Fig. 5

Skizze einer dritten Sensorstation

Fig. 6

Skizze einer vierten Sensorstation

Fig. 7

Skizze einer fünften Sensorstation

Fig. 8

Skizze einer sechsten Sensorstation

Fig. 9

Skizze einer siebten Sensorstation

Fig. 10

Abwicklung einer sensorbewährten Fläche eines Anstellkörpers

Fig. 11

Einen ersten Ausschnitt der Fläche in Figur 10

Fig. 12

Einen zweiten Ausschnitt der Fläche in Figur 10

The individual figures show:

Fig. 1

Sketch of a column machine

Fig. 2

Sketch of a central cylinder engine

Fig. 3

Sketch of a first sensor station

Fig. 4

Sketch of a second sensor station

Fig. 5

Sketch of a third sensor station

Fig. 6

Sketch of a fourth sensor station

Fig. 7

Sketch of a fifth sensor station

Fig. 8

Sketch of a sixth sensor station

Fig. 9

Sketch of a seventh sensor station

Fig. 10

Processing of a sensor-proven surface of an Anstellkörpers

Fig. 11

A first section of the area in FIG. 10

Fig. 12

A second section of the area in FIG. 10

Fig. 1 shows a sketch of a column machine 1, in which is unwound from a unwinding roll 2 4 web. The web passes through guide rollers to the printing units D1-D4, which are equipped here as gravure printing units with impression rollers P1-P4 and format cylinders F1-F4. The finished printed web 4 is wound on the take-up roll 5. The web 4 passes between the printing units 1 to 4 Bahnfinishingstationen T1 to T4, which are often configured in gravure printing machines as a pure dryer. Generally, the term Bahnfinishingstation is used as a generic term at least to the terms dryer and fuser.

In the web running direction z in front of the web finishing station T2 is the sensor station 7. With this, the moisture content of the web can be measured. Knowing the measured values, the activity of the webfing station T2 can be controlled.

In the web running direction z between the web finishing station T3 and the printing unit D4 is the sensor station 8, which also determines the residual moisture or - depending on the solvent in the printing inks - the residual solvent content in the colors. Based on the measured values obtained, the activity of the web finishing station T3 can be controlled since the measurements allow a conclusion as to whether the activity of the web finishing station T3 is appropriate or not.

FIG. 2 shows a sketch of a central cylinder printing machine 10, in the printing cylinder D1 to D6 against a central impression cylinder. 6 are employed. Again, the web 4 is unwound from a unwinding roll 2. She will have an in FIG. 2 Guide roller 3, not shown, supplied to the central impression cylinder 6 and pressed there by the pressure roller 9. As a result of the rotation of the central counter-pressure cylinder 6, the web is guided successively through the pressure zones DZ1 to DZ6, which respectively form between the pressure cylinders D1 to D6 and the central impression cylinder 6.

1. 1. Die beiden Sensorstationen sind allen Druckwerken/Farbwerken der Zentralzylindermaschine zugeordnet.
2. 2. Der Bahnfinishingstation T sind zwei Sensorstationen 7 und 8 zugeordnet. Die eine Sensorstation 7 ist der Bahnfinishingstation T in Bahnlaufrichtung z vor- die andere 8 nachgelagert.

Finally, the web 4 leaves the peripheral surface of the central impression cylinder 6 and is guided by means of guide rollers 3, not shown, through the sensor station 7, the web finishing station T and the sensor station 8 and wound on the take-up reel 4. Compared to the arrangement of the sensor stations 7 and 8 of the FIG. 1 illustrated stator printing machine 1 fall thus two principal differences:

1. 1. The two sensor stations are assigned to all printing units / inking units of the central cylinder machine.
2. 2. The Bahnfinishingstation T are assigned to two sensor stations 7 and 8. The one sensor station 7 is the Bahnfinishingstation T in the web running direction z before the other 8 downstream.

As already in relation to FIG. 1 may be mentioned, with a sensor station 8 downstream of a Bahnfinishingstation, a regulation of the same are made. A sensor station 7, upstream of a web finishing station 7, can drive a web finishing station 7 and, when used in conjunction with a downstream sensor station, reduce the response time. Another major advantage of such an upstream sensor station 7 but should be that also the activity of the sensor station upstream printing units can be controlled to a certain extent. For example, the result of such measurements can be that color with very high solvent concentration is applied to the substrate. Such a statement is not necessarily identical to the result of a measurement of solvent in the ink circuit of a printing press, since at least between the ink in the printing press and the color film still a color separation and an incipient drying and / or crosslinking process is. On the basis of the abovementioned measured values, it is therefore also possible to regulate the color composition (for example more or less solvent).

In particular, if a sensor station is assigned to a plurality of inking units, as in FIG. 2 If this is the case, it is of advantage if colors of the same basic concentration (same ratio between solvent, color pigments and possibly blend) are present at all of these inking units.

Further advantages for the regulation of the activity of web finishing stations arise when the composition of the starting mixture and the color mass at the inking units, which are assigned to the Bahnfinishingstation, the control device are known. These advantages are also to be increased if the control device is kept permanently "up to date" on the color mass and / or color composition.

Against the background of the aforementioned data, such a control device can better interpret the measured values.

In FIG. 3 a first simple sensor station 21 is sketched. The first setting roller 11 can be brought into contact with the printing material 4 in the area of the applied printing medium. The guide rollers 3 touch the substrate or the web 4 on the unprinted side. In its surface, the setting roller 11 contains sensors with which the amount of solvent per unit area can be measured. It should also be mentioned that the printing material web 4 in FIG. 3 passes through a nip between a guide roller 3 and the set roller 11. In this way, a reliable mechanical contact of the printing substrate 4 and the surface 30 of the first Anstellwalze 11 and the Anstellkörper be guaranteed.

Another way of producing such a reliable mechanical contact is by the DE 41 18 807 C2 reveals: There it is proposed to charge sheets electrostatically so that they - in the quoted Reference for the purpose of cooling - better conform to a roll surface. This teaching may also be useful in connection with the present invention to make the contact between the first Anstellkörper 11 and 4 web intimately. Of course, electrostatic charging of the web 4 will make it difficult to use a number of measuring methods. It may even be necessary to unload a deliberately or unintentionally charged web 4 before it enters the measuring range.

One of the well-known advantages of electrostatics is that it supports, for example, the color separation in gravure printing. There, impression rollers and gravure cylinders are brought to different electrical potentials. During the printing process, the ink, which initially sits in the recesses of the engraving cylinder, is pulled out of these recesses by the electric field, so that the transfer of ink to the printing substrate is increased. The DE4204871 C2 shows a device that applies this teaching.

By building up a comparable potential difference between the pressure gap in FIG. 3 delimiting rollers 3 and 11, the transfer still free pressure medium components on the Anstellwalze / Anstellköper 11 can be supported. In this context, charging of the web 4 and / or charging of the pressure medium film comes into question.

Another sensor station 21 is in FIG. 4 shown. Here is a first Anstellwalze 11 again charged with sensors in its surface. With it 11, the amount of conductive solvent can be measured on its surface. Against this first Anstellwalze another Anstellwalze 12 is employed. It is transparent and equipped with a radiation sensor 13 inside. It measures the intensity of the radiation 15 emitted by the radiation source 14, which falls through the envelope of the second setting roller 12 that is transparent to this radiation. When color pigments are transferred to the surface of the set roller 12, the radiation recorded by the radiation sensor 13 changes significantly, and conclusions can be drawn on the amount of color pigments per unit area of the second set roller 12.

FIG. 5 shows first in the transport direction of the pressure medium components y by the Anstellkörper 11, 12 the same features as FIG. 4 , However, a further Anstellwalze 16 is employed against the second Anstellwalze 12. This roller may also have sensors. Thus, this roller may be equipped with capacitive sensors that govern the presence of a dielectric bleed. In this way, it is also possible to measure the quantity of this further component of the pressure medium which is still free in the applied color film. In these processes, polymers designed to react with the paint ingredients can be used.

In the embodiment of a sensor station 21 shown here follow the further Anstellwalze 16 in the transport direction of the color through the Anstellkörper two more rollers 24, the color components to the doctoring chamber 17 transport, which is filled with a solvent and absorbs the color components. A return transport (against the direction y of the color transport) of the solvent to one of the measuring rollers acted upon by measuring means 11, 12 and 16 is prevented by the doctor blade of the doctor chamber 17, not shown, and by the additional doctor blade 18. In summary, it can be said that the further rollers 24, the doctor blade 18 and the blade chamber 17 serve as a color sink 23 - which is indicated by the curly bracket. The presence of the ink sink ensures a permanent removal of the pressure medium components from the front Anstellköpern 11, 12 and 16, which are acted upon with sensors safely. In this way, inter alia, a constant accumulation of color components is avoided on these rollers. If the removal of the color components is well adjusted by the ink sink 23, sets on the provided with measuring means rollers 11, 12 and 16, an amount of certain printing media per unit area, a balance between this amount on the substrate and the amount in the color sink represents. This equilibrium amount remains constant for a sufficient time to be measured.

In addition to or instead of a color sink 23, which has at least one roller 24 and doctor devices 17,18, other types of color sinks come into question, the targeted constantly remove color components of Anstellkörpern (an indication of the substrate 4 is of course not meant here ). So For example, a roller may constantly dispense colorant ingredients to a revolving nonwoven body that is changed from time to time.

• Die dort gezeigte Sensorstation 21 weist zunächst dieselben Merkmale auf wie die in Figur 5 gezeigte Sensorstation. Jedoch ist die erste Anstellwalze 11 von dem Bedruckstoff abgeschwenkt. Zum Zwecke des An- und Abschwenkens ist sie an dem Schwenkarm 20 befestigt, der seinerseits an der Achse der zweiten Anstellwalze 12 angelenkt ist. Im Rahmen ihrer Abschwenkbewegung ist die erste Anstellwalze 11 auch gegen die Reinigungswalze 19 angestellt worden. Eine zweite Reinigungswalze 19 ist gegen die zweite Anstellwalze 12 angestellt worden. In dieser Stellung reinigen die Reinigungswalzen 19 die Anstellwalzen 11 und 12.

Another way to counteract undesirable enrichment of the pressure medium components on the front Anstellwalzen 11, 12 and 16, is of FIG. 6 shown:

• The sensor station 21 shown there initially has the same features as those in FIG. 5 shown sensor station. However, the first Anstellwalze 11 is pivoted away from the substrate. For the purpose of pivoting up and down, it is attached to the pivot arm 20, which in turn is articulated on the axis of the second Anstellwalze 12. As part of its Abschwenkbewegung the first Anstellwalze 11 has also been employed against the cleaning roller 19. A second cleaning roller 19 has been turned against the second set roller 12. In this position, the cleaning rollers 19 clean the Anstellwalzen 11 and 12th

After the in FIG. 6 sketched cleaning phase can again connect a measurement phase in which the first Anstellwalze 11 is employed against the substrate 4, connect. The measured values can therefore be obtained in a sequence of measuring and cleaning cycles.

In FIG. 7 a setting station is shown in which the first Anstellkörper is a circulating belt 11. The Umlaufgeschwindigleit the band again corresponds to that of the web 4, so that between these two elements 4, 11 no Reltivgeschwindigkeit is present. As a result of this circumstance, damage to the pressure medium film facing the positioning body 11 does not occur on the web 4. The band-shaped positioning body 11 passes over deflecting rollers 26 and web guiding rollers 27, which also make it against the printing material 4. On the band-shaped Anstellkörper 11 are again sensors 29, for example, measure the residual solvent content in the paint film. This can in particular in the in FIG. 7 be measured structure without components of the pressure medium on the Anstellkörper 11 pass. The length of the contact between a certain portion of the web 4 and a certain portion of the band-shaped Anstellkörpers 11 is crucial in this case for the measurement, longer periods of time are advantageous. The Length depends on the length of the portion of the web-shaped Anstellkörpers 11 and the speed of the printed material 4 from. Advantageous here are lengths of over one meter.

FIG. 8 shows a sensor station 21, which is equipped with a first Anstellwalze 11, which has a very large diameter. The printing material web 4 wraps around this setting roller in a very large part (wrap angle). Advantageously, wrap angles of over 90 °. Further advantages result at over 180 °, 270 ° and 300 °. Also in this Anstellwalze 11, the roll shell sensors that measure characteristics of the ink film on the substrate 4. In particular, the surfaces of rolls in which electrical properties change can be provided, for example, by photochemical methods. As already mentioned, conductor structures can be applied to these surfaces. The resistances or capacitances between these conductors may change as a result of contact with color components. More recently, complex conductor patterns are also increasingly applied to substrates by printing methods. In addition to longer known screen printing processes (eg hybrid technology), increasing attention is being given to printing processes in which organic polymers in fine structures are often applied to the substrate with a multiplicity of layers.

In all these methods it is advantageous to apply the conductor or generally the sensor structures to flexible substrates which can be applied to the sleeve surface, or the band-shaped surface. It is also advantageous to provide the surface with a sensor array or a sensor matrix.

In addition to all these physical sensors, chemical sensors can also be used. Thus, in the field of chemistry, substances are known which discolor, coagulate, or undergo changes in a similar significant manner that may be measured or which the viewer will readily notice in the presence of other substances. An example of such an effect is the reaction of the litmus paper to the change in pH. With Lackmuss acted surfaces can therefore be used under certain conditions as surfaces of Anstellkörpern in the sense of this document.

In view of the large number of colors or color systems used, inter alia, in packaging printing, it is advantageous to configure the roll surfaces of setting rollers as exchangeable sleeves. This also applies if the relevant Anstellkörper 11, 12, 16 and 24 carries no sensors and only needs to be adjusted to different Farbtransporterfordernisse.

For some of the measuring methods mentioned, constant environmental conditions such as a constant temperature are advantageous. These must then be able to be provided in the sensor station 21. As already mentioned, an alternative to a constant temperature of the roller and optionally the web is a measurement of the temperature, which can also take place with a first setting body 11. Based on the measured temperature values, measured values can then be calibrated to other characteristic values of the pressure medium film.

The transport of the web 4 on a set-up roller 11 with a very large wrap angle leads to a long-lasting intimate contact between the set roller 11 ago. It may be used as an alternative or in addition to the measures relating to FIG. 3 have been proposed to achieve this goal (including electrostatics, provide nips by employing guide rollers against the Anstellwalze 11).

In FIG. 9 will be like in FIG. 8 a first setting roller 11 is shown, which is largely wrapped by web. In the area in which the surface of the setting roller is wrapped, the web 4 rests on the surface of the setting roller and is transported only by the rotation of the setting roller 11. In some applications, it may be very important to know the speed of the incoming web accurately and to control the web speed and / or circular speed of the roller surface so that these two sizes are the same from the beginning. For this purpose, a specific measurement of the web speed can be made before reaching the setting roller 11.

This speed can advantageously be determined based on the revolutions of one of the rollers involved in the printing process. In some applications, a speed determination between the last printing zone DZ in the web running direction before the sensor station 7, 8, 21 and the sensor station be beneficial. This can be done again with the aid of a revolving roller or a nip (record the speed of the roller, calculate the web speed via the roller diameter). However, in particular in the cases where the repeat length is known in this field, optical methods are also available in which, for example, the path speed can be deduced from the sequence of register marks.

It is advantageous to provide such a largely entwined Anstellwalze with a large diameter. Diameters greater than 50 cm are helpful here.

In the area between the two pressure rollers 9, a second Anstellwalze 12 is employed against the surface of the first Anstellwalze 11. This roller is similar in characteristics to the second setting roller 12 in the FIGS. 4 and 5 , Instead of this roller, however, a cleaning roller 19 could be useful at this point.

In FIG. 9 is the second Anstellwalze 12 in operative connection with a color or pressure medium sink 23, which has the same components as the pressure medium sinks 23 in the FIGS. 4 and 5 , The in FIG. 9 The construction shown again provides the possibility of determining measured values with the two sensor-proven setting rollers 11 and 12. These can be obtained by different methods. In the largely looped Anstellwalze 11 in particular offer the electrical and electronic and the chemical measurement method. In the case of the second setting roller 12, optical methods (inter alia based on transmission and / or absorption and / or reflection or scattering on the roller surface) are also suitable.

The active compound with the color sink ensures a constant removal of color components from the system and prevents the accumulation of the same in the area of the sensors.

Much of the above-described methods can be performed by control units set up, for example, by the implementation of suitable software. In the present context, especially the control unit of the printing machine in question for this purpose.

In FIG. 10 is the surface of an Anstellkörpers outlined. If the Anstellkörper is a roller, then FIG. 10 to be understood as the sketch of a development of the roll surface. The surface 30 is divided into a matrix, wherein the individual surface areas are assigned to sensors 29. How these sensors can be arranged is in the FIGS. 11 and 12 shown by the surface portions 31 and 36. In the surface portion 31, the conductor tracks 32 and 33 can be seen. Their thickened ends indicate that they are in electrical contact with tracks below the surface. The two interconnects 32, 33 are brought to a different electrical potential. If there is a conductive liquid in the area between the interconnects, the resistance between the two interconnects 32, 33 drops. This circumstance can be measured. The resistance also decreases when there is a mechanical contact between the conductor tracks 32, 33 and the pressure medium film, without a final transfer of pressure medium constituents to the at least one first Anstellkörper 11 sets and the paint film, for example, as a result of its residual solvent content, a noteworthy having electrical conductivity.

Alternatively or additionally, the area between the strip conductors or even entire areas of the surface of the Anstellkörpers be covered with a chemical that reacts color components and this case changes at least one electrical property such as conductivity. This change can then be measured.

The resistance between the two electrodes 34 and 35 can be measured in the same way. However, the in FIG. 12 Also shown is geometry for measuring a capacitance change that occurs in the presence of a dielectric fluid between the electrodes. Often, the tracks and electrodes will be raised from the rest of the surface 30. Again, the change in capacity as described above can be caused solely by the properties of color components. Again, however, is alternatively or additionally the possibility available to provide on the roll surface substances that combine with color components, with a significant change in capacity comes about.

From the Figures 10 - 12 It can also be seen that measurement on a positioning body 11, 12, 21 can be carried out with different measuring methods, even though simultaneous measurement of resistance and capacitance on a surface 30 may rather be the exception for physical reasons.

Furthermore, it should not be necessary to provide such a large part of the surface 30 with sensors 29, as in FIG. 9 outlined. In many cases, it should be sufficient to scan a fraction of the pressure medium film regularly with suitable sensors 29.

If, on the basis of the measured values, the composition of the pressure medium in the printing press 1, 10 is to be controlled from different pressure medium constituents and / or the activity of a web finishing station T, T1, T2, longer response times of the variables to be controlled are to be expected anyway. LIST OF REFERENCE NUMBERS 1 Stand printing press 2 Processing / Role 3 guide rolls 4 train 5 Rewind / Role 6 Central impression cylinder 7 Sensor station (control) 8th Sensor station (regulate) 9 pressure roller 10 Central cylinder engine 11 First roller, first Anstellkörper 12 second roller, second Anstellkörper 13 sensor 14 radiation source 15 radiation 16 further roller, further Anstellkörper 17 blade chamber 18 doctor blade 19 cleaning roller 20 swivel arm 21 sensor station 22 Arrow in the direction of rotation of the roller 23 color sink 24 further roller, further Anstellkörper 25 Axle of the first Anstellwalze 11 26 deflection rollers 27 Tape guide rollers 28 Lever of the belt guide rollers 29 sensor 30 Surface of an Anstellkörpers 31 First surface section 32 conductor path 33 conductor path 34 electrode 35 electrode 36 Second surface section T, T2, T3 Dryer and / or crosslinker, railway finishing station F1 - F6 F1 - F6 D1 - D6 Printing cylinder 1-6 DZ1 - DZ6 Pressure zones 1-6 z Direction of the railway transport y Transport direction of the pressure medium

Claims (17)

1. Rotary printing press (1, 10) for printing a printing material (4),

   - which has transport means (3) with which the printing material (4) can be guided through the printing press (1, 10) in a transport direction (z),

   - which has at least one inking unit (F1 - F6), with which printing medium can be applied to the printing material (4),

   - and which has a sensor station (7, 8, 21), which is arranged downstream of the at least one inking unit (F1 - F6) in the transport direction (z) of the printing material (4) and which has sensors (13, 29) with which measured values can be recorded,

   characterized

   - in that the sensor station (7, 8, 21) has at least one first contact element (11), which can be brought into contact with the printing material (4) in the area of the printing medium applied, and

   - in that the sensors of the sensor station (7, 8, 21) record measured values which originate from constituents of printing media which are in contact with the at least one first contact element (11) and/or have been removed from the printing material (4) by the at least one first contact element (11).
2. Rotary printing press according to Claim 1, characterized

   - in that at least one printed product finishing station (T, T1, T2), the activity of which can be controlled by a control device, is arranged downstream of the at least one inking unit (F1 - F6),

   - in that the measured values from the sensor station (7, 8, 21) can be led to the control device, and

   - in that the control unit is set up to control or to regulate the activity of the printed product finishing station (T, T1, T2) on the basis of the measured values.
3. Rotary printing press according to one of the preceding claims, characterized in that the sensor station (7, 8, 21) has at least one second contact element (11), which can likewise be brought into contact with the printing material (4).
4. Rotary printing press according to one of the preceding claims, characterized in that the sensor station (7, 8, 21) has at least one second contact element (12), which, in turn, can likewise be brought into contact with at least one first contact element (11).
5. Rotary printing press according to one of the preceding claims, characterized in that the sensor station (7, 8, 21) has at least one printing medium sink (23) for removing printing medium from at least one of the contact elements (11, 12, 16) of the sensor station (7, 8, 21).
6. Rotary printing press according to one of the preceding claims, characterized in that at least one of the contact elements (11, 12, 16) of the sensor station (7, 8, 21) has sensors (29) in its contact face with which it is possible to record measured signals which have a dependence on the concentration of printing medium constituents on the contact face of the contact element (11, 12, 16) with the printing material (4).
7. Rotary printing press according to the preceding claim, characterized in that the sensors (29) in the contact face of the at least one contact element (11, 12, 16) are sensors which change their electric and/or electronic properties in the event of contact with printing medium constituents.
8. Rotary printing press according to the preceding claim, characterized in that the sensors (29) have exposed conductors or semiconductor tracks (32, 33, 34, 35).
9. Rotary printing press according to one of the preceding claims, characterized in that at least one of the contact elements (11, 12, 16) of the sensor station (7, 8, 21) is a roll, and in that this roll can be assembled from a sleeve and a mandrel, the sleeve forming the circumferential surface of the roll and the mandrel being in the roll interior.
10. Rotary printing press according to Claim 9, characterized in that at least one of the rolls of the sensor station (7, 8, 21) can have its temperature controlled.
11. Rotary printing press according to Claim 9 or 10, characterized by a sensor system (13, 29) which can be moved into an operating position in relation to at least one of the rolls of the sensor station (7, 8, 21).
12. Method for monitoring characteristic values of a printing medium printed onto a printing material by a printing press,
    characterized

    - in that at least one first contact element (11, 12, 21) is brought into contact with the printing material (4) in the area of the printing medium that is printed on, and

    - in that measurements are carried out on constituents of the printing medium which are in contact with the contact element (11, 12, 21) and/or have been transported by the at least one first contact element (11, 12, 21).
13. Method according to the preceding claim, characterized in that the ratio of quantities of the constituents of the printing medium in the printing press (1, 10) is regulated on the basis of the measurements.
14. Method according to one of the preceding claims, characterized in that the constituents of the printing medium are transported onward from the first contact element (11) at least to a second contact element (12) and, if appropriate, to further contact elements (21).
15. Method according to one of the preceding claims, characterized in that at time intervals at least one contact element (11) is set on and off a moving printing material (4) or a contact element (11, 12, 21) placed upstream in the transport direction of the printing medium (y).
16. Method according to one of the preceding claims, characterized in that at least one contact element (11, 12, 21) is washed.
17. Method according to one of the preceding claims, characterized in that measurements are made with at least two groups of sensors (13, 29), preferably using two different measuring methods.

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