EP1600290B1 - Use of a printing ink in a printing group - Google Patents

Abstract

Rotary print machine has a print mechanism with which print ink can be applied to a print medium. The dependence between the print ink ease of flow or elasticity and temperature is at most 0.6 tack /[deg]C in the temperature range between 22 and 50[deg]C. Alternately in a production speed range between 3 and 16 m/s the ink elasticity varies by at most 1.5 tack s/m. Independent claims are also included for the following:- (a) A rotary print machine that uses ink of specific tackiness; (b) a print ink whose tackiness varies in a given way over a given temperature range or production speed; (c) and use of print ink of a given tack in a rotary printer or in non-aqueous offset printing.

Description

The invention relates to a use of a printing ink in a printing unit of a rotary printing press according to the preamble of claim 1.

By the JP 62-191 152 a control is known, wherein a cooling of a roller temperature in dependence on the operating state of the printing machine is switched on or off. During production, the cooling is regulated as a function of the surface temperature of a forme cylinder.

EP 06 52 104 A1 discloses a printing unit for waterless offset printing with various options for temperature control of the surface of cylinders. So z. B. during the preparation for the printing operation preheating, and during printing a constant maintenance in a certain temperature range, a pressure plate on the forme cylinder z. B. at a constant temperature of 28 to 30 ° C, possible.

Also in the literature, z. As in Walenski, the web offset printing 1995, in connection with the waterless offset printing a temperature of the plate and transfer cylinder as a prerequisite for the printing of high-quality printing results mentioned, the temperature of the printing plate to be kept constant at 25 to 28 ° C. For the purpose of newspaper printing, suitable toughness values of 3.5 to 5 tack are specified for reasons of speed.

A printing unit is disclosed in EP 0 886 578 B1, wherein an inking unit and the ink-conducting cylinders are arranged in a partially enclosed space. Around To avoid cloning on the one hand and drying of the ink on the other side, the partially enclosed space is kept at a predeterminable temperature and a certain level of atmospheric humidity or concentration of chemical substrates. For example, the entire room is maintained at a set point of 33.8 ° C, a humidity of 75% and / or a concentration of chemicals of 300 ppm.

DE-OS19 53 590 discloses a printing unit with inking and dampening, which is temperature controlled by means of a tempering device. A setpoint for the temperature can before the start of the printing process depending on influencing variables, eg. As the printing speed, based on a proof or tables are set. An advantageous upper limit of the temperature of the printing ink is indicated at room temperature.

The FOGRA Research Report 3.220 deals with the tempering of an inking unit in a sheetfed offset press. A uniform process flow is obtained here z. B. with held constant inking temperatures. By changing the inking temperature, the color transfer, z. As the tack, but are affected. For example, for a particular printing ink, a temperature of about 35 ° C. must be set on the surface of a rubbing cylinder of the inking unit of the sheet-fed offset press in order to prevent picking for a specific setting of the dampening solution quantity. A representation of measurement results shows values for the determined tack as a function of the dampening solution quantity and a crushing limit of 6.5 N / m.

From DE 197 36 339 A1 discloses a tempering in a printing unit is known, wherein the thermostatic properties, such as u.a. the agility to be influenced.

In DE 44 31 188 A1 is by means of a cooling device, a printing forme a Printing unit for waterless offset printing cooled to about 28 to 30 ° C.

ISO 12634: 1996 (E) provides a regulation for the measurement of pastes of pasty colors, one of several suitable measuring instruments being the "Prüfbau Inkomat".

The invention has for its object to provide a use of a printing ink in a printing unit of a rotary printing press.

The object is achieved by the features of claim 1.

The achievable with the invention advantages are in particular that a high print quality and trouble-free operation, both at low and at high production speeds can be achieved.

It is particularly suitable to use the method and the apparatus in waterless offset printing, since the build-up of printing ink and contamination on the ink-conducting components is a problem in this printing process. U. a. can in the absence of dampening solution increased, and for the printing process or the printing inks may occur too high a temperature in the printing unit. Due to the lack of fountain solution, soiling, paper dust and fibers u. U. may not be effectively out of the process.

Build up of ink and contaminants on one side and clinging of the printing plate by "wrong" temperatures on the other side is effectively reduced, and ideally prevented.

It is also advantageous that with the method or the device an ideal Adaptation to different printing inks and / or substrates can be made. By regulating a disturbing picking between ink-transferring cylinder and substrate can be effectively prevented or reduced.

In an advantageous embodiment of the forme cylinder of the printing unit is heated, without the additional generation of a gas flow on its surface, but from the forme cylinder such. B. an introduced into the form cylinder temperature control, evaporation, etc. A thus accelerated evaporation of paint ingredients and premature dehydration can be prevented. Also to a setting of a special room climate and possibly to be provided exhaust air purification significantly reduced demands are to be made.

It is particularly economical and simple if only the or the forme cylinders are tempered by the printing cylinder without additional tempering of the transfer cylinder. However, the inking unit may additionally have a tempering.

Moreover, by the method and apparatus, a significant saving of energy over conventional techniques, for example, wherein the cylinders are each held at a single, fixed low temperature, possible.

An embodiment of the invention is illustrated in the drawing and will be described in more detail below.

Fig. 1

eine schematische Darstellung eines Druckwerks für den wasserlosen Offsetdruck;

Fig. 2

eine schematische Darstellung von Zusammenhängen zwischen Temperatur, Zügigkeit sowie Produktionsgeschwindigkeit;

Fig. 3

ein Ausführungsbeispiel für ein Regelschema;

Fig. 4

eine beispielhafte Sollwertvorgabe a) als Tabelle, b) als Stufenfunktion c) als stetige Kurve;

Fig. 5

Diagramm für die Charakteristik einer verwendeten Farbe.

Show it:

Fig. 1

a schematic representation of a printing unit for waterless offset printing;

Fig. 2

a schematic representation of relationships between temperature, tack and production speed;

Fig. 3

an embodiment of a control scheme;

Fig. 4

an exemplary desired value specification a) as a table, b) as a step function c) as a continuous curve;

Fig. 5

Diagram for the characteristic of a used color.

A printing press, in particular a rotary printing press, has a printing unit 01, which has at least one inking unit 02, a cylinder 03 carrying a printing forme 04, for. Example, as a forme cylinder 03 executed printing group cylinder 03, and a counter-pressure cylinder 06 has (Fig. 1). The printing form 04 is preferably designed as a printing forme 04 for the planographic printing (planographic printing forme 04), in particular for the waterless planographic printing (waterless lithographic printing forme 04). The printing unit 01 is z. B. executed as a printing unit 01 for offset printing and has between the forme cylinder 03 and the impression cylinder 06 another cylinder 07, z. B. a running as a transfer cylinder 07 printing cylinder 07 with a lift 08 on its lateral surface. The transfer cylinder 07 forms with the impression cylinder 06 in a print-on position on a substrate 09, z. B. a printing substrate 09, a printing point 11. The impression cylinder 06 may be another transfer cylinder 06 of a non-designated further printing unit, or a no ink leading impression cylinder 06, z. As a steel or a satellite cylinder, be.

The printing forme 04 can be sleeve-shaped or else designed as one (or more) pressure plate 04, which is fastened or suspended with its ends in at least one narrow channel which does not exceed a width in the circumferential direction of 3 mm (indicated in Fig. 1). Likewise, the elevator 08 on the transfer cylinder 07 sleeve-shaped or as (at least one) blanket be executed 08, which is also fixed in at least one channel and / or tensioned. If the rubber blanket 08 is designed as a multi-layer metal printing blanket, then the channel is also designed with the above-mentioned maximum width.

The inking unit 02 has a paint supply 12, z. As a paint tray with fountain roller or lifter, or a chamber doctor blade with ink supply, and at least one of the forme cylinder 03 in a pressure-on position engagable roller 13, z. B. on an applicator roll 13. The ink is transported in the example of the ink supply 12 via an executed as an anilox roller 14, the roller 13, the forme cylinder 03 and the transfer cylinder 07 on the substrate 09 (eg, web-shaped or as a sheet). It may also be a second, with the anilox roller 14 and the forme cylinder 03 cooperating, not shown applicator roller 13 may be arranged.

The printing unit 01 is embodied as a so-called "printing unit for waterless planographic printing", in particular "waterless offset printing" (dry offset), ie, in addition to the supply of printing ink, no further supply of dampening solution is required for the formation of non-printing areas. In this method, the application of a moisture film on the printing plate 04 can be omitted, which otherwise in the so-called "wet offset" prevents the non-printing parts on the printing plate 04 from accepting printing ink. In waterless offset printing, this is achieved through the use of special inks and the special design of the surface on the printing plate 04. So z. As a silicone layer in waterless offset printing take over the role of assignable with dampening hydrophilic range of wet offset, and prevent the printing plate 04 at the color pickup.

Generally, the non-printing areas and the printing areas of the printing form 04 become more different due to the formation of areas Surface tensions achieved in interaction with the ink.

To sound free, d. H. Without even the non-printing areas also accept printing ink and possibly even enforce to print, it requires a printing ink in their tack (measured as tack value) is set so that due to the surface tension difference between printing and non-printing parts on the plate a flawless Separation can take place. Since the non-printing areas are preferably formed as a silicone layer, a printing ink with a compared to the wet offset significantly higher tack is needed for this purpose.

The tack, for example, according to "The Web Offset Printing", Walenski 1995, represents the resistance with which the ink counteracts the film splitting in a nip or in the transfer of the printing ink in the printing zone between the cylinder and the printing substrate and is usually used in roller systems, e.g. in a "tack-o-scope" or a "tackmeter".

As the tack of the ink changes with temperature, in practice, during operation of the printing press, the cylinders 03; 07 and the inking unit 02 cooled and kept at a constant temperature to avoid toning for the changing operating conditions during printing.

However, the tack of the printing ink influences not only the separation of printing and non-printing areas but also the strength of a plucking when a color-guiding cylinder 03 interacts; 07 with the substrate 09. In particular, when the substrate 09 as uncoated, low-density newsprint with very good absorbency, ie open-pored and with very low Wegschlagzeit executed, increases the risk of loosening caused by fibers or dust. This danger is but z. B. also used in web offset printing lightly coated or lightweight, coated paper grades with a coating weight of z. B. 5 - 20 g / m ² , especially 5 - 10 g / m ² or even less before. Overall, the temperature is particularly suitable for uncoated or coated papers with a coating weight of less than 20 g / m ² . For coated papers, the method may u. U. be advantageous if it is found that the stroke by increasing speed from the paper (at least partially) "deducted.

In order to minimize picking or build-up on the blanket and the printing plate 04, it is attempted to produce and use the printing ink for the intended use and the expected operating conditions as close as possible to the lower limit of the speed.

With regard to the toning or clogging of the non-printing areas on the printing plate 04, in addition to the tack of the printing ink, the relative speed during the detachment process, ie the release of the printing ink, also plays a role. H. when splitting or loosening the ink, a crucial role. The printing ink generates at a higher production speed V (corresponds to the surface or unwinding speed V of the printing cylinder (03); 07 or the conveying speed of the printing material 09, measured, for example, in m / s) in the gap both between roller 13 and Printing form 04 of the forme cylinder 03 and between the printing forme 04 of the forme cylinder 03 and the elevator 08 on the transfer cylinder 07 larger demolition forces. The lower the relative speed, z. As the intended production speed V is, the higher the speed of the ink to choose to prevent cloning at lower production speeds V. Otherwise, the wrong choice for poor print quality or during startup leads to increased paper waste and high maintenance.

Increases the dynamic speed with increasing production speed V, so there is usually a stronger plucking on the substrate 09 and increased build up of dirt and ink on the printing plate 04. This has complications and an increased maintenance frequency, z. B. frequent washing of the surfaces, when the tack was designed for a lower or middle range of the production speed V.

This problem, which is currently not solvable even by a special choice of printing ink, has been recognized in its context and has been solved by the method and the control device described below. With the method and the device, plucking and the associated introduction of fibers and dust into the printing unit 01 are avoided or reduced in each region for the production speed V. At the same time toning of the printing plate 04 is avoided for each production speed V and achieved a high print quality.

One or more of the color-guiding components, such. B. in an advantageous embodiment of the form cylinder 03 running as a printing cylinder 03 as ink-carrying component 03, and / or the ink itself, is temperature controlled in dependence on the production speed V. The temperature T is not kept constant for all production _speeds V in a specific temperature range, as otherwise customary in waterless offset printing, but has different setpoint values T _SO1 for different production _speeds . The temperature T is regulated as a function of the production speed V such that the tack of the printing ink at any desired production speed V is within a predefinable window of tolerable tack values. For a higher production _speed V, an increased setpoint T _{SOll is selected} for the temperature T of the corresponding component 03 or the printing ink.

An example of the dependencies of the relationships between the temperature T and the tack (tack value) and between the production speed V and the tack (tack value) is shown schematically in FIG. Regardless of the size and the scale graduation for the tack values, this decreases with increasing temperature T and increases with increasing production speed V. The two curves for the temperature T The curve of the temperature T represents the dependence of the tack value at a constant production speed V, while conversely the curve for the production speed V represents a curve for a constant temperature T.

A tack suitable for printing (tack value) is in a "printable area" of tack values, i. H. in a window ΔZ. The limits of the window ΔZ are i. d. R. soft trained, d. H. in case of undershoot or exceedance, the quality does not deteriorate abruptly but gradually. However, the tack values for the respective printing ink determined, for example, by paint manufacturers are dependent on the measuring device used and the method, so that the dependency and the window ΔZ from FIG. 2 must be converted into one another for different methods and measuring devices.

The values shown by way of example in FIG. 2 show the dependencies only schematically on the basis of a single curve representing the respective group. However, the values for a suitable window ΔZ are based e.g. B. on measurement results on an "Inkomat" Fa Fa. Prüfbau. They are to be transmitted in a different way to be determined according to the above.

Also, the tear behavior described above in addition to the tack value also depend on the radius of curvature of the cooperating surfaces, so that in case of considerably large of the present case cylinder 03; 07, d. H. With a circumference of about 800 to 1,200 mm, even the desired window .DELTA.Z for the tack value can easily move.

The window .DELTA.Z for the tack, lying for trouble-free printing in waterless offset printing, is z. B. between 6 and 9.5, in particular between 7 and 8.5. at Reduction of tack occurs in the "clay area" increased toning, with enlargement in a range "plucking - build up" an increased picking and increased buildup on the cylinders 03; 07 on.

The method is now based on the control principle that for the intended, imminent, or current production _speed V as a _reference variable, a specific setpoint T _SOll or maximum value T _{MAX is assigned} for the temperature T of the component 03 or the printing ink as the output variable. The setpoint T _SOll or maximum value T _MAX represents in both cases a preset temperature T _V , which in the first case corresponds to a temperature to be maintained and in the second case corresponds to an upper limit of a permissible temperature.

This can, as exemplified in Fig. 3, take place by means of a timing chain, wherein z. B. a control device 16, the production _speed V is _{supplied as a reference variable} , in the control _device 16 based on a stored relationship 17 between the production _speed V and the setpoint T _SOll for the temperature T of the required setpoint T _SOll or not to be exceeded maximum value T _MAX determined and is supplied as a reference variable of a control device 18. This control device 18 keeps the temperature T of the component 03 or the ink as a controlled variable via a control path 19 to the setpoint T _SOll constant, or brings them to the setpoint T _SOll or ensures that the temperature T does not exceed the maximum value T _MAX , The temperature T of a component 03 is preferably the temperature T in the near-surface region of the component 03, in particular the temperature T of an envelope surface or elevator 04 cooperating with the printing ink. The measurement of the temperature T takes place, for example, by means of at least one sensor arranged on the component 03 or elevator 04.

The component 03 or the printing ink can by means of a conventional control device 18 via, for example, a cooling and / or heating unit, a Temperiermittelkreislauf, via variation of a Temperiermittelstromes, u. U. also be brought by means of blowing appropriately tempered or sized in its flow gas / air flow or other common methods as a controlled system 19 to the corresponding temperature T as a controlled variable. Since the printing unit 01 in waterless offset printing, among other things due to the lack of cooling effect of the fountain solution usually heated more than desired, is provided in this case as a controlled system 19 only a cooling device 19 for temperature control, which corresponds to the component 03 and the ink to the production speed V. Setpoint T _SOll leads or stops. In this case, each production _speed V can also be _assigned the maximum value T _MAX for the temperature T instead of a setpoint value T _SOll , which is monitored and maintained by the control device 18.

The information about the desired and / or the current production speed V can, for example, be made manually by input via an input unit 21 operatively connected to the control device 16 and possibly adjusted in the further course from the values of a machine controller 22. It is advantageous, instead of a manual input, to take the data for the desired and / or current production speed V from a program sequence of the machine controller 22 on which the production is based.

The control device 16 and the control device 18 may be structurally combined and integrated in the machine control 22 or the structural design of the controlled system 19.

In a simplified embodiment, instead of the control _device 16, the possibility of specifying the desired value T _SOll or the maximum value T _MAX as a _reference variable for the control device 18 in other ways, for example by means of manual selection, are made. In this case, too, the choice made by the printer of the setpoint T _SOll or of the maximum value T _MAX is, for example an above-mentioned context 17, possibly in the form of a table, based.

In another simplified embodiment, for example, there is a control device 16, by means of which the temperature T is set on the basis of empirical values without a subsequent control loop. Here, for example, without the need for a measuring point on the cylinder 03 or the printing plate 04, a temperature control to the setpoint T _SOll or the maximum value T _MAX done. The temperatures resulting for certain operating conditions and settings of the temperature control are known in this case, for example, from previous calibration measurements. An internal control loop for temperature control of the temperature control itself, etc. may still be present.

4 shows, by way of example and schematically, a relationship 17, as in a control diagram according to FIG. 3 in or for the control device 16 as table a), as step function b) defined in sections or as a continuous, monotonically increasing function c) in a not shown Memory unit or a computer can be stored. For printing inks of different "basic consistency", z. As different manufacturers or different composition, different contexts 17 may be deposited. This also applies to different colors of the printing ink.

Depending on the component to be tempered, z. B. the forme cylinder 03, the transfer cylinder 07, the ink supply 12, the roller 13, the roller 14 as an ink-carrying component 03; 07; 12; 13; 14, or the ink itself, such a table may have different values.

In an advantageous embodiment, the form cylinder 03 of the printing unit 01 is tempered by means of the method and the apparatus, since this effectively both the requirement for sound-free printing on the one hand, as well as the reduction or, avoiding the picking on the other side with minimal effort. In contrast to the sole tempering of the inking unit 02, the temperature of the forme cylinder 03 is both close to the printing plate 04, as well as in sufficient proximity to the pressure point cooperating with the printing substrate 09 11. On the other hand, it is in terms of effort and effectiveness advantageous if of the two printing cylinder 03; 07 only the forme cylinder 03 is directly tempered. The desired gradient of the temperatures on the forming and transfer cylinder 03; 07 adjusts itself in this version with the selected conditions. A temperature of the transfer cylinder 07 from the inside would be slow if necessary.

The forme cylinder 03 is in the case of a non-continuous relationship 18 (Fig. 4, b)), for example, in a lower region of the production speed V, z. B. between 1 to 4 m / s, to a temperature T of about 20 to 25 ° C, in particular from 21 to 23 ° C tempered. For greater production _speeds V out of the temperature T is assigned a higher setpoint T _SOll or maximum value T _MAX , which for example, for production _speeds V of 4 to 6.5 m / s between 26 and 31 ° C, especially at 27 to 29 ° C. For production speeds V, which more than z. B. 6.5 m / s, in particular more than 10 m / s, for example, set values T _SOll and maximum values T _MAX for the temperature T of the forme cylinder 03 assigned, which are greater than 30 ° C, or even greater than 32 ° C.

If, for example, the production _speed V is 6.5 to 11 m / s, a setpoint T _SOll or maximum value T _MAX in the range of greater than 30 to 37 ° C can be assigned. In a finer subdivision z. B. production speeds V of 6.5 to 9 m / s z. B. a range greater than 30 ° C to 35 ° C and for production _speeds V of 9 to 14 m / s, a target value T _SOll or maximum value T _MAX of about 32 to 37 ° C, z. B. 34 to 36 ° C, or assigned to greater than or equal to 35 ° C. For even higher production speeds V, even higher values for the temperature T can be assigned. It can range from 1 to 14 m / s even in less, z. B. in only two or three stages, or else in more stages, each with a temperature T to be assigned. It may also be advantageous to store the relationship as a continuous function as exemplified in FIG. 4 c).

If other conditions exist, eg. As printing inks with significantly different properties, a substrate 09, which has a different surface of uncoated newsprint paper and / or a completely different Rupfverhalten, the values of the relationship may differ significantly from the above values. Common to the solution, however, is still the regulation of the temperature T of the forme cylinder 03 as a function of the production _speed V, in such a way that it has a higher setpoint T _SOll or maximum value T _MAX in a range of higher production _speeds V, as for a range lower Production speeds V. By means of the method and the device is thus the plucking between ink-carrying cylinder 03; 07 and the substrate 09 reduced and ideally almost prevented.

For high production speeds V, z. B. from 6.5 m / s, in particular from 10 m / s, it is of particular advantage that the temperature T is set in contrast to previous proposals for solutions to values of more than 30 ° C. Only then can the plucking and the associated contamination for high production speeds V be effectively prevented.

If a rotary printing machine with high production speeds V, z. B. with 6.5 m / s or in particular 10 m / s and more, it is also possible in an embodiment not shown to dispense with the aforementioned regulation of the temperature T as a function of the production rate V, and in principle a temperature of the component 03, in particular of the forme cylinder 03, or a maximum value T _MAX contrary to previous practice to a temperature T of greater than 30 ° C, in particular greater than or equal to 32 °, for example a temperature T of 32 to 37 ° C provided.

With the temperature of the forme cylinder 03, in particular the temperature control in the near-surface region or the printing plate 04, to above 30 ° C in comparison to previous practice in high ranges of the production speed V a tone-free printing is possible without the printing plate 04 is clogged with printing ink , without printing areas lead too little or too much color, and without fibers and / or dust from the substrate 09 via the transfer cylinder 07 is introduced into the printing unit 01. An expense, which would bring a separate temperature of the forme cylinder 03 (low temperature) and additionally the transfer cylinder 07 (higher temperature) with it, is advantageously avoided by the present choice of temperature T for the forme cylinder 03. In addition, with the temperature control from the inside by means of a fluid, for. As a liquid, and a high cost of housing, air conditioning and exhaust air cleaning avoidable, as he is required for example in convective cooling of the inked, outwardly directed side of the printing plate 04. The forme cylinder 03 is therefore flowed through by a Temperiermittelstrom in an advantageous embodiment, which can be controlled either in its mass flow or in an advantageous manner about its temperature.

For the possibly lower production speeds V during the start-up process, if certain time intervals and the correct choice of the time for the pre-run or the switching on of the temperature control, with increasing production speed V and associated heating never lies outside the desired or predetermined tack value To be quick.

One criterion for the manner in which the described method and apparatus obtains an advantageous application is the characteristic of the printing ink used in the dependencies of speed on the production speed V on the one hand, and on the temperature T on the other hand.

A suitable characteristic is exemplified in FIG.

In particular, this is a printing ink, which in connection with said method in the entire range for the production rate V of 1 m / s and 16 m / s, in particular 3 to 16 m / s, and / or the temperature of 15 ° to 50 ° , in particular 15 ° to 40 °, a tack value of 4 does not exceed below and 12 does not exceed. Ideally, the tack value for the range of a production speed V of 3 to 16 m / s or a temperature of 22 ° to 50 ° C is in a range of 6 to 9.5 tack, in particular between 7 and 8.5 tack.

The characteristic of the ideal ink runs horizontally for both dependencies, ie. H. the gradients (dTack / dV) and / or (dTack / dT) are in the area of interest for production, e.g. B. from 15 ° to 50 °, in particular from 22 ° to 50 °, and from 1 to 16 m / s, in particular from 3 to 16 m / s, in about 0.

In a temperature range of 22 ° to 50 ° C, the ink has a dependence of a tack on the temperature T, so that an amount of the gradient dTack / dT maximum 0.6 Tack / ° C (-0.6 to +0.6 ), in particular less than or equal to 0.3 Tack / ° C (-0.3 to +0.3). For temperature ranges greater than 30 ° C., the amount of the gradient dTack / dT is advantageously less than or equal to 0.2 Tack / ° C (-0.2 to +0.2). In one embodiment of the printing ink, the dependence between speed and temperature T is carried out as a falling curve, the gradient dTack / dT lies here between -0.6 and 0 Tack / ° C for the temperature range of 22 ° to 50 ° C, in particular of -0.3 to 0.

In the range of production speeds (V) of 3 to 16 m / s, at least 9 to 14 m / s, the dependence of the tack of the printing ink on the production speed (V) is such that the amount of the gradient dTack / dV is at most 1.5 Tack * s / m (-1.5 to +1.5), in particular less than or equal to 1 tack * s / m (-1 to +1). For Production speeds (V) of above 6 m / s is the amount of the gradient dTack / dV in an advantageous embodiment less than or equal to 0.5 Tack * s / m (-0.5 to +0.5). In one embodiment of the printing ink, the dependence between speed and production speed V is carried out as a rising curve, the gradient dTack / dV here lies between +1.5 and 0 tack * s / m, in particular from +1 to 0 for the stated range.

The curves of the two dependencies shown in FIG. 5 are advantageously increasing or decreasing monotonically in the considered interval and preferably have a gradient of opposite sign.

Said ink is advantageously used in the above-mentioned printing unit or the above-mentioned rotary printing press, which at least one cooperating with a printing ink and by means of a tempering device 18, 19 controllable component 03; 07; 12; 13; 14 has. It is z. B. designed as a printing machine for the planographic printing, in particular for the waterless planographic printing. However, it can be designed for direct or indirect planographic printing.

LIST OF REFERENCE NUMBERS

01

printing unit

02

inking

03

Cylinder, printing cylinder, forme cylinder, component

04

Printing form, printing plate, planographic printing plate, waterless planographic printing plate

05

-

06

Impression cylinder, transfer cylinder

07

Cylinder, printing cylinder, transfer cylinder, component

08

Elevator, blanket

09

Substrate, substrate web

10

-

11

bruise

12

Paint supply, component

13

Roller, applicator roller, component

14

Roller, anilox roller, component

15

-

16

control device

17

context

18

control device

19

Controlled system, cooling device

20

-

21

input unit

22

machine control

T

temperature

T _target

Setpoint for the temperature

T _MAX

Maximum value for the temperature

V

production speed

.DELTA.Z

Window of the tack / pressure range

Claims (27)

1. Use of a printing ink in a printing couple of a rotary printing press with a waterless flatbed printing forme (04), from which the printing ink is capable of being transferred directly or indirectly to a material to be printed (09) in the form of newsprint, characterized in that during operation under printing conditions the printing ink has an adhesiveness of from 6 to 9·5 tack.
2. Use of a printing ink in a printing couple according to Claim 1, characterized in that the printing ink present on a printing forme (04) of a forme cylinder (03) has an adhesiveness of from 6 to 9·5 tack.
3. Use of a printing ink in a printing couple according to Claim 2, characterized in that the printing ink is capable of being transferred in the direct printing process from the forme cylinder (03) to the material to be printed (09).
4. Use of a printing ink in a printing couple according to Claim 2, characterized in that the printing ink is capable of being transferred in the indirect printing process from the forme cylinder (03) by way of a transfer cylinder (07) to the material to be printed (09).
5. Use of a printing ink in a printing couple according to Claim 4, that the printing ink present on the transfer cylinder (07) has an adhesiveness of from 6 to 9·5 tack.
6. Use of a printing ink in a printing couple according to Claim 1, characterized in that in one temperature range a dependency of an adhesiveness of the printing ink upon the temperature (T) has a magnitude of the gradient of a maximum of from 0·6 tack / °C.
7. Use of a printing ink in a printing couple according to Claim 6, characterized in that the temperature range is from 22° to 50°C.
8. Use of a printing ink in a printing couple according to Claim 1, characterized in that in a range for a production speed (V) a dependency of an adhesiveness of the printing ink upon the production speed (V) has a magnitude of the gradient of a maximum of from 1.5 tack * s/m.
9. Use of a printing ink in a printing couple according to Claim 6 or 8, characterized in that the printing couple has a waterless flatbed printing forme (04).
10. Use of a printing ink in a printing couple according to Claim 1, 6 or 8, characterized in that the material to be printed (09) is in the form of paper with a coating weight of at most 20 g/m².
11. Use of a printing ink in a printing couple according to Claim 1, 6 or 8, characterized in that a tempering device (18, 19) is provided, by means of which a region - close to the surface - of a rotating component (03; 07; 12; 13) of the printing couple, a packing (04; 08) or the printing ink itself is capable of being tempered to a nominal value (T_soll) or maximum value (T_MAX).
12. Use of a printing ink in a printing couple according to Claim 11, characterized in that the rotating component (03) is constructed in the form of a forme cylinder (03) with a printing forme (04).
13. Use of a printing ink in a printing couple according to Claim 11, characterized in that the rotating component (07) is constructed in the form of a transfer cylinder (07) with a rubber blanket (08).
14. Use of a printing ink in a printing couple according to Claim 11, characterized in that for a production speed (V) of greater than or equal to 10 m/s the nominal value (T_soll) or maximum value (T_MAX) in a region - close to the surface - of the forme cylinder (03) or the packing (04) is pre-set to be greater than 30°C.
15. Use of a printing ink in a printing couple according to Claim 1, 6 or 8, characterized in that in a range of a production speed (V) an adhesiveness of the printing ink is substantially constant.
16. Use of a printing ink in a printing couple according to Claim 8 or 15, characterized in that the range of the production speed (V) is at least from 9 to 14 m/s.
17. Use of a printing ink in a printing couple according to Claim 8 or 15, characterized in that the range of the production speed (V) is from 3 to 16 m/s.
18. Use of a printing ink in a printing couple according to Claim 11, characterized in that it comprises a control device (16) by means of which the nominal value (T_soll) or maximum value (T_MAX) of the tempering device (18, 19) is capable of being pre-set.
19. Use of a printing ink in a printing couple according to Claim 11, characterized in that a relationship (17) between a production speed (V) and an associated nominal value (T_soll) or maximum value (T_MAX) is pre-set.
20. Use of a printing ink in a printing couple according to Claim 11 or 19, characterized in that a higher nominal value (T_soll) or maximum value (T_MAX) of the temperature (T) is pre-set for a higher production speed (V) and a lower nominal value (T_soll) or maximum value (T_MAX) of the temperature (T) is pre-set for the lower of two different production speeds (V).
21. Use of a printing ink in a printing couple according to Claim 11, characterized in that the rotating component (13; 14) is constructed in the form of a roller (13; 14) of an inking unit.
22. Use of a printing ink in a printing couple according to Claim 11, characterized in that the rotating component (13; 14) is constructed in the form of an anilox roller (14).
23. Use of a printing ink in a printing couple according to Claim 1, characterized in that the printing ink present on a roller (13; 14) of an inking unit has an adhesiveness of from 6 to 9·5 tack.
24. Use of a printing ink in a printing couple according to Claim 1, characterized in that the printing ink present on an anilox roller (14) of an inking unit has an adhesiveness of from 6 to 9.5 tack.
25. Use of a printing ink in a printing couple according to Claim 6 or 8, characterized in that the said gradient occurs with a production speed V of from 3 to 16 m/s and a temperature of from 22° to 50°C.
26. Use of a printing ink in a printing couple according to Claim 1, characterized in that the adhesiveness for the range of a production speed V of from 3 to 16 m/s and a temperature of from 22° to 50°C is in a range of from 6 to 9·5 tack.
27. Use of a printing ink in a printing couple according to one or more of the preceding Claims, characterized in that the tack values for the said conditions are determined by an "Inkomat" of the firm Prüfbau.

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