EP2246190A1 - Preparation of a process-agent for printing machines. - Google Patents

Abstract

The arrangement has a processing medium cleaning device, a processing medium pipeline for connecting the processing medium cleaning device and a printing machine (1), and a flotation device (9). A processing medium circuit (7) has a supply line (71) that supplies a processing medium from a processing device (2) to the machine. The processing circuit has a return line (72) that discharges the processing medium from the machine to the processing device. The flotation device is arranged in the supply line and in connection with the processing cleaning device. An independent claim is also included for a method for operating an arrangement for processing medium supply at a printing machine.

Description

The invention relates to an arrangement on a printing press with a process agent cleaning device and a method for cleaning process fluid.

Printing presses use a number of process agents. For example, require offset printing machines that are operated in wet offset next to the ink process water, the so-called dampening solution or fountain solution. The fountain solution used is intended to wet the non-printing areas of the printing plate and thus prevent ink acceptance in these areas. Further, processing agents such as e.g. Detergents are used, which are used in particular for cleaning printing cylinders and blanket cylinders.

A common composition of dampening solution is a proportion of more than 80% by volume of water, up to 10% by volume of chemical additives and up to 15% by volume of isopropanol.

The chemical additives serve u.a. the lowering of the surface tension on a pressure-technically favorable range, containment of the microorganism formation by means of biocides, prevention of corrosion at steel components of the printing press by means of corrosion inhibitors, etc.

The isopropanol has, inter alia, a viscosity-increasing and a surface tension-lowering effect.

Isopropanol is more volatile than other fountain solution ingredients, resulting in uneven evaporation of isopropanol and others

Dampening solution components, especially at higher temperatures, may result in a change in the mixing ratio in the dampening solution.

The dampening solution composition, in particular the proportion of isopropanol, must therefore be monitored on the one hand and readjusted accordingly. On the other hand, attempts are made to keep the dampening temperature as low as possible in order to avoid excessive evaporation of isopropanol. As a rule, therefore, the dampening solution is cooled to a temperature in the range of T = 10 ° C. Other process agents used on printing presses are frequently tempered.

The effort to keep the temperature of certain machine components and process agents low counteracts the heat generated by the operation of a printing press.

Therefore, printing presses are usually equipped with temperature control. These can be used both for the temperature control of the process agent and for the temperature control of the functionally essential parts of the printing press, in particular the printing cylinder. Tempering in the sense will usually mean cooling, but is also quite a heating into consideration, for example, in the start-up phase of a printing press.

The operation of corresponding tempering is relatively expensive, especially because of the energy required, which is needed for example for the operation of a refrigerator or an electric heater.

To reduce the required energy to be used, for example, in the DE 10 2005 015 954 A1 proposed for temperature control of dampening solution, to provide the dampening solution circuit with an additional heat exchanger, which communicates with a free-cooler temperature control, that is, a device that exploits approximately the temperature of the ambient air.

Isopropanol is due to cost and environmental aspects increasingly in the criticism, since such additives are considered harmful to health and the environment. A goal of the previous and further development is therefore, an economical use of dampening water, in particular with the contained alcohol constituents. One way to do this is to reduce the isopropanol concentration.

For this purpose, in the utility model DE 297 21612 U1 described to apply the dampening solution with a gas. By varying the pressure and temperature, "non-equilibrium" states are generated which lead to absorption of the gas. Due to the changing equilibrium conditions, outgassing occurs on the pressure plate. As a result, the hydrophilic areas of the printing plate are better wetted and the dampening solution is displaced from the hydrophobic areas. For this process, a relatively complex process engineering is necessary and the goal is to make the water "more active" on the pressure plate. The entry of the gas takes place, inter alia, via water jet pumps.

However, the isopropanol reduction in the dampening solution circuit causes the dampening solution to become more polluted.

Such contamination of the processing means may e.g. occur due to color components and paper dust. During operation, larger quantities of dampening solution regularly accumulate, which have to be renewed at certain intervals, in particular if they have soiling. In order to extend the renewal cycles and reduce the associated costs, the soiled process agent is typically removed, e.g. cleaned by filtration.

The DE 100 61 870 A1 discloses a cleaning system in which a feed pump removes fountain solution from a buffer and pumps the dampening water into a cleaning unit. In the cleaning unit, a further pump is provided, which presses the fountain solution through a pressure filter. According to the disclosure of this document, the entire dampening water flow through the Guided cleaning unit.

The U.S. Patent No. 7,082,159 discloses a cleaning unit in which the fountain solution from a central tank, from which the printing units of a printing press are fed, is conveyed by means of a pump and passed through various cleaning devices. The cleaned fountain solution is returned to the central tank after cleaning.

In the DE 103 60 051 A1 discloses a device in which contaminants, which have adhesive properties, are conveyed from a tank via what is known as a belt skimmer. This device has the disadvantage that only dirt with adhesive properties adhere to the tape and can be removed from the dampening solution via such a device.

Nevertheless, even with the printing presses known in the prior art, the costs associated with disposal and renewal of the process means remain high, so that even slight further improvements in the process agent supply, in particular the dampening solution supply, make economic sense. The same applies to a reduction of solvent-based cleaning agent. The development in these areas is in full swing, with a variety of solutions being pursued as illustrated.

task

The present invention has for its object to provide an arrangement on a printing press, which allows to avoid unnecessary energy costs and to use environmentally and health-friendly process means, the arrangement is cheap to manufacture and operate.

Solution of the task

The object is achieved by the arrangement and the method according to the Main claims solved. Advantageous embodiments are the subject of the dependent claims.

One aspect of the invention relates to an arrangement comprising a printing press, a process agent cleaning device, a process fluid line connecting the process agent purification device and the printing machine, and a flotation device.

Flotation in the sense of the invention denotes a process in which present in the liquid particles (eg solid particles, droplets, molecules, ions, microorganisms or other small organisms) attach to fine gas bubbles in the process agent, which then due to the lower density of the gas bubbles surrounding medium have an increased buoyancy. Traditionally, flotation is understood to mean a process in which the gas bubbles with the particles rise to a surface of the liquid and form a separable foam layer there. In contrast to this, flotation in the sense of the application means only the introduction of the gas bubbles, which takes place in such a way that the particles can accumulate on the gas bubbles. An ascent of a foam layer to a surface and a cleaning of the foam layer takes place in the context of preferred embodiments described below. To prevent the fine air bubbles from bursting at the surface or collapsing below the surface, which could cause the debris to sink and lead to undesirable deposits, it is preferable to either keep the air bubbles very small, provide low pressures in the process medium, and / or to add certain chemicals (foaming agents) to the waste water. The term 'flotation device' in the sense of the invention denotes a device by which a flotation in the sense of the application is effected. A flotation device in conjunction with a process-agent cleaning device has the advantage that contaminants in the process medium are kept in motion, so that they can be supplied almost completely to the process-agent purification device. Deposits of impurities within the arrangement are advantageously avoided.

Also preferred is an embodiment of the arrangement in which the process fluid line is part of a process medium circuit and wherein the arrangement further comprises a treatment device, wherein the process medium circuit has a flow, which process medium from the processing unit supplies the printing machine, and wherein the process means circuit has a return, which dispenses process agent from the printing machine to the processing unit.

A further advantageous embodiment relates to an arrangement in which the flotation device and the process agent cleaning device are designed and arranged such that gas bubbles which can be introduced into the process medium by means of the flotation device remain at least partially stable up to the process agent purification device. In this case, the flotation device and the process-agent purification device are preferably configured such that the process agent, which is preferably enriched with visible gas bubbles, can be fed to the process-agent purification device.

Preferably, such an arrangement has a design in which the flotation device is arranged in the flow. The flotation device is preferably arranged at a central passage point through which the entire process medium is circulated, so that the entire process medium can be provided with gas bubbles.

Furthermore, such an arrangement is preferred in which the arrangement has at least one dampening solution trough and wherein the flotation device is arranged upstream of the dampening solution trough in the flow direction.
In particular, a dampening solution tank designates a fountain solution box from which a fountain solution film is applied to a first of several rolls in the dampening unit in a dampening unit or in which excess dampening solution is collected. In order to prevent dampening water from being heated in the dampening solution tank, the dampening solution tray is preferably part of a fountain solution Dampening solution circulation over which the dampening solution trough continuously cooled dampening solution is supplied, which is finally removed from the dampening solution circuit for reprocessing and / or cooling. Since the dampening solution is partially removed from the dampening system and consumed in the circuit, that is, not returned to the circuit, the dampening solution circuit described in this way is an open circuit. Preferably, the flotation device is arranged in the flow direction immediately in front of the dampening solution trough, that is, in a printing machine with multiple dampening units at least one flotation per dampening unit is provided, through which the process medium flow, which flows to the respective fountain solution, can be provided with gas bubbles. Furthermore, a removal device can preferably be provided on the dampening solution trough, which is designed such that the dampening solution trough can be removed from the surface of the fluid that is floating on the fluid surface and preferably can be fed to the process-agent cleaning device.

A further advantageous embodiment relates to such an arrangement in which the flotation device is arranged in the return.

Further preferred is a design of an arrangement in which the flotation device has a high-speed stirrer and / or a water jet pump and / or a lance and / or an injector and / or an ejector.

Furthermore, such an arrangement preferably has a design in which the flotation device has a feed device by means of which a foaming agent can be supplied to the process agent. The step of supplying e.g. Surfactants and / or foam stabilizers via the feed device make the air bubbles more stable, so that adhering impurities can be transported over a greater distance without settling in undesired places.

Also preferred is an embodiment of the arrangement in which a plurality of flotation devices are arranged in the process medium circuit, in order to prevent deposition of impurities at different points in the process medium circuit. For example, it is preferably possible to provide a plurality of injectors for this purpose along the process medium circuit, via which air bubbles are introduced into the process agent.

Furthermore, an embodiment of the arrangement is preferred in which the process-agent purification device is arranged in the flow and / or in the return flow and / or in the treatment device. In this case, the process agent cleaning device may have a removal device, in which the gas bubbles ascend in the form of foam to a process agent surface and are removed there. In the foam product, the flotate, the particles to be separated are enriched. The buoyancy of the substances to be separated is artificially increased by the addition of fine air bubbles. The flotate is withdrawn or removed by means of the removal device. In this case, a parallel cleaning and / or sterilization of the flotate can preferably take place and the purified process agent can be returned to the circulation.

A further advantageous embodiment relates to an arrangement in which the arrangement further comprises a bypass which interconnects the flow and the return in such a way that a process medium flow can be conducted past the treatment device through the bypass, and wherein the process agent purification device is arranged in the bypass. In this case, the arrangement is preferably designed such that specifically only gas-containing fluid is passed through the bypass, so that the fluid flow with gas bubbles and adhering thereto impurities is separately cleaned.

Preferably, such an arrangement has a design in which a plurality of process agent cleaning devices are arranged in the process medium circuit.

Furthermore, such an arrangement is preferred, in which the process-agent cleaning device has a filter unit. Such a filter unit may preferably be a cross-flow filter and / or a separator and / or consumable filter materials and / or a reverse osmosis device include.

A further advantageous embodiment relates to such an arrangement in which the process agent cleaning device has a sterilization device. A sterilization device may be provided either by appropriate design of a filter unit as described above and / or by alternative / additional provision of sterilization without filter function, e.g. by supplying hydrogen peroxide, ozone or the like. Other degermination devices can. e.g. Include flow heaters, by which the process agent is preferably heated above 60 ° C. A sterilization device can preferably be provided alternatively or additionally at another point of the arrangement independently of the process-agent purification device.

Further preferred is a design of an arrangement in which the sterilization device has a UV radiation source and / or a radio-wave radiation source and / or a heating device and / or an ultrasound source. In this case, such a UV radiation source preferably has a radiation spectrum which is tuned to specific microorganisms which are to be killed in the process agent in such a way that the UV radiation generated is well absorbed by the microorganisms, from the process agent in which the However, microorganisms are poor. This will cause the microorganisms to be killed without undesirably heating the process agent. A corresponding design may preferably also have the other radiation sources mentioned. Such a sterilization device can preferably be provided alternatively or additionally at another point of the arrangement independently of the process-agent purification device.

Furthermore, such an arrangement preferably further comprises a defoamer. This is advantageous if foam-free process agents are to be used in certain areas of the arrangement, and in particular if foaming agents are used in certain areas.

Also preferred is an embodiment of the arrangement in which the defoamer has a physical and / or a chemical action principle. A physical mode of action may e.g. by sprinkling the process agent to be defoamed by a sprinkler.

A further advantageous embodiment relates to such an arrangement in which a heat exchanger is further provided, which is provided for controlling the temperature of the process means in the process medium circuit.

Also preferred is an embodiment of the arrangement in which the heat exchanger is provided in the return.

A further advantageous embodiment relates to an arrangement in which the heat exchanger (4) is a free-cooler temperature control, wherein the free-cooler temperature control is provided in the process means circuit that it is flowed through by the process means to be cooled. Process fluids are any fluids that are supplied to the operation of printing presses and / or circulated in the printing presses, in particular dampening solution, gear oil and / or other fluids which are used for cooling certain components. However, with regard to the free-flow tempering device through which the process fluid flows, the term "process agent" does not refer to a tempering agent, such as the refrigerant usually used in refrigerating machines (eg R 407c, R143a, R410a), which is used in a temperature control circuit to be provided separately Process agent is used. By free-cooler temperature control device is meant a device which exploits approximately the temperature of the ambient air in order to cool the process agent. The subject arrangement has the advantage that no separate Temperiermittelkreislauf for the free cooler temperature control unit and thus no heat exchanger between such Temperiermittelkreislauf and the process means leading process line is required. Consequently, the arrangement is cheaper to produce and has an increased efficiency. In the maintenance of the arrangement, this has Furthermore, the advantage that no separate level of a temperature control must be observed in the free cooler temperature control. Furthermore, a free-cooler temperature control unit can be operated at low cost and, if the free-cooler temperature control unit flows through directly by the process medium, the efficiency of the temperature control is improved. If a sufficient temperature difference between the ambient air and the process agent temperature is given, the intended temperature control may be achieved alone or at least largely by utilizing the outside temperature.

Furthermore, it is preferred if the arrangement further comprises a blowing device, which is arranged such that the free-cooler temperature control device can be flowed with an air flow. As a result, with the same temperature difference between ambient air and process medium, a larger process medium flow per unit time can be cooled.

Also considered advantageous is an arrangement in which the free-cooler temperature control is deactivated when the temperature of the process fluid in the portion of the process fluid line leading from the printing press to free-cooler temperature control unit is higher than the air temperature of the air, which for cooling the Freecooler temperature control unit is used.

Preference is given to an arrangement which further comprises a bypass line through which processing means can be passed by the free cooler temperature control unit.

A preferred embodiment of such an arrangement further comprises a valve, via which a process medium flow into the freecooler temperature control unit or the bypass line can be introduced or distributed to the freecooler temperature control unit and the bypass line.

Further, an arrangement is further preferred, which further comprises a first temperature sensor, which is designed and arranged such that on the first temperature sensor, the process temperature is detectable, wherein the valve and / or the blowing device can be controlled and / or regulated as a function of the detected process-agent temperature.

Also advantageous is an arrangement which further comprises a second temperature sensor which is designed and arranged such that via the second temperature sensor, the air temperature can be detected, which is used for temperature control of the freecooler temperature control, wherein the valve and / or the blowing device in dependence detected air temperature is controllable and / or regulated.

A further preferred embodiment is directed to an arrangement in which the free-cooler temperature control is arranged in a room of a building in which the printing press is set up.

Furthermore, it is preferred if, in the arrangement, the freecooler temperature control unit is arranged outside a building in which the printing press is set up.

Furthermore, such an arrangement is preferred, wherein no additional temperature control devices are provided on the printing press for the process medium flow to be cooled by the freecooler temperature control unit, except for the freecooler temperature control unit.

Furthermore, it is conceivable to provide various free-cooling temperature control devices at different locations, which are e.g. can be switched on and / or off at different times of day and / or seasons depending on the respective ambient air temperature.

A further aspect of the invention relates to a method for operating an arrangement for supply of process agent to a printing machine, comprising the steps of providing an arrangement for supplying the process agent to a printing press comprising a freecool temperature control unit and a sterilization device, tempering the process means to the respective ambient temperature by means of the freecooler temperature control device and Degermination of the process agent by the Sterilizing. In experiments, it was surprisingly found that, despite the proportion of chemical additives in the dampening solution, which are usually used to control the formation of microorganisms, a tendency to fouling in the dampening solution in the circulation, which is the process agent in this case, increases with a reduction of the isopropanol content , The provision of a sterilization device nevertheless allows a reduction of the proportion of isopropanol with simultaneous use of dampening solution at higher temperatures than before. Such a degermination device can also be used in an arrangement without flotation device according to the method according to the invention, even if the device for the application of the method advantageously comprises a flotation device.

In a further preferred method, the free-cooler temperature control unit and the sterilization device are provided configured as described above with respect to the arrangements according to the invention.

Preferably, the method further comprises a heating step wherein process agent is heated to at least 60 ° C.

Another advantage is a method in which the sterilization device is operated as a function of the ambient temperature. In such a method, different devices that are provided in the context of the arrangement can be switched on and / or be operated with other operating conditions, so that a higher cleaning effect is achieved when the ambient temperature, for example in summer is so high that too It is expected that due to the higher temperature, a higher contamination could result and therefore a better disinfecting effect is desired. For example, the radiation of a UV radiation source and / or a radio-wave radiation source and / or a heating device and / or an ultrasound source can be amplified for this purpose. Alternatively or additionally, a filter unit or an additional filter unit can be switched into the circuit and / or an alternative / additional provision of a sterilization without a filter function, eg by supplying hydrogen peroxide, ozone or the like. Furthermore, it is conceivable that a process-medium-heating device, by means of which the process medium is heated above 60 ° C., eg a continuous-flow heater, is operated at a higher temperature than at low ambient temperatures.

Also considered to be advantageous, a method, wherein the arrangement provided is one of the above-described inventive arrangements.

Figur 1

zeigt eine schematische Darstellung einer bevorzugten Ausführungsform einer erfindungsgemäßen Anordnung mit einem Flotationsgerät.

Figur 2

zeigt eine schematische Darstellung einer anderen bevorzugten Ausgestaltung einer erfindungsgemäßen Anordnung mit mehreren Flotationsgeräten.

Figur 3

zeigt eine schematische Darstellung einer weiteren bevorzugten Ausgestaltung einer erfindungsgemäßen Anordnung wobei ein Flotationsgerät in einem Aufbereitungsgerät integriert dargestellt ist.

Figur 4

zeigt eine schematische Darstellung einer bevorzugten Ausführungsform einer erfindungsgemäßen Anordnung mit einem Wärmetauscher.

Figur 5

zeigt eine schematische Darstellung einer anderen bevorzugten Ausgestaltung eines Wärmetauschers als Freikühler-Temperiergerät.

Figur 6

zeigt eine schematische Darstellung einer weiteren bevorzugten Ausgestaltung eines Wärmetauschers als Freikühler-Temperiergerät.

In the following, individual particularly preferred embodiments of the invention will be described by way of example. Some of the described embodiments have features that are not necessarily required to practice the present invention, but are generally considered preferred. Thus, embodiments are also considered to be covered by the teaching of the invention, which does not have all the features of the embodiments described below. Similarly, it is conceivable to selectively combine features described with respect to different embodiments.

FIG. 1

shows a schematic representation of a preferred embodiment of an inventive arrangement with a flotation device.

FIG. 2

shows a schematic representation of another preferred embodiment of an inventive arrangement with multiple flotation devices.

FIG. 3

shows a schematic representation of another preferred embodiment of an inventive arrangement wherein a flotation device is shown integrated in a processing unit.

FIG. 4

shows a schematic representation of a preferred embodiment of an inventive arrangement with a heat exchanger.

FIG. 5

shows a schematic representation of another preferred embodiment of a heat exchanger as a freecooler temperature control.

FIG. 6

shows a schematic representation of another preferred embodiment of a heat exchanger as a freecooler temperature control.

Detailed description of the figures

FIG. 1 shows a schematic representation of a preferred embodiment of an inventive arrangement on a printing press 1 with a flotation device. In the illustrated preferred case, the printing press 1 is a sheetfed offset press. Shown is a second process means circuit 7 with a flow 71 and a return. In the illustrated preferred embodiment, the second process means circuit 7 is a dampening medium circuit, through which fountain solution is fed to the printing machine. The flotation device is designed in the illustrated preferred embodiment as a water jet pump.

The term "second" process means circuit 7 is not intended to indicate that the arrangement should or should comprise two process means circuits. The term was chosen only to distinguish this second process means circle conceptually from another process means circle 3, the example in FIG. 4 is described.

In this context, it should be noted that the arrangement can also be executed with only one circuit, in which both the preferred heat exchanger 4 and the flotation device and / or other described components of the arrangement are arranged.

In this case, preferably finely distributed air is introduced into the process means by the flotation device, which in particular in the form of visible air bubbles occur, and remain stable at least over a considerable distance, such that particles which accumulate on the air bubbles over the not insignificant distance are transportable. Accordingly, this embodiment has the advantage that, for example, by the printing process in the dampening precipitating solids such as powder, paper components or other particles are stable in a suspended state until they are withdrawn at a suitable location, for example by means of filtration the dampening solution circuit. For this purpose, a filter unit is provided in the illustrated preferred embodiment in the return 72.

A treatment device 2, which is provided in the illustrated preferred embodiment between flow 71 and return 72, assumes the traditional tasks assumed by these devices, which may include additional filtering, control and compensation of desired components of the dampening solution, temperature, etc.

FIG. 2 shows a schematic representation of another preferred embodiment of an arrangement according to the invention with a plurality of flotation devices, which is similar in essential parts, which will not be described again, the first described embodiment.

It shows the FIG. 2 an embodiment in which the water jet pumps are arranged in the inlet of dampening solution tanks of dampening units 10, not shown. This has the advantage that in the illustrated preferred embodiment, the gas bubbles are generated in the region of the point in the system where they are needed. The filtration is operated in this embodiment in a bypass to the treatment device. It is also conceivable to arrange such a bypass between flow 71 and return 72 before the treatment unit 2 or in the treatment unit 2 itself.

FIG. 3 shows a schematic representation of another preferred embodiment of an inventive arrangement wherein the flotation device 9 a fast stirrer, which is shown integrated in a treatment device. In addition to the rapid stirrer schematically represented by a propeller, a dampening solution flow pump is shown, through which the fountain solution of the printing press can be supplied. In this embodiment, the filtration is arranged in the flow. In addition, there is a defoamer in the return.

This defoamer 82 may also be used at other locations in the dampening solution circuit, e.g. be arranged in the bypass and has the advantage that excessive foaming is avoided. Defoamers 82 may e.g. on a chemical or physical basis (e.g., sprinkling with native liquid).

In FIG. 4 a printing machine 1 is shown, to which a treatment device 2 is connected in or via the second process means 7, which has the already described flow 71 and the return 72 and the example used for temperature control of the process means in a manner not shown. A second connection between the printing press 1 and the treatment device 2 has a process center circuit 3, which likewise comprises a feed line 6 and a process-line line 5 designed as a return line and serves for cooling the process medium. Flow 71, return 72, feed line 31 and return line 32 represent different formations of a process line 5.

It is in FIG. 4 no flotation device 9 but only a heat exchanger 4 is shown, which will be described in more detail below. However, one or more flotation devices 9 according to the invention can be arranged at arbitrary locations in the illustrated process lines 5.

In this case, it is conceivable that the fluids which flow through the second process center circuit 7 and the process center circuit 3 cool different components of the printing machine 1. Furthermore, it is conceivable that in the second process medium circuit 7 and the process medium circuit 3 different fluids are used.

It is preferred that the process medium circuit 3 serves to supply one or more cleaning devices and / or one or more dampening device devices and / or serves for cooling the impression cylinder.

In the preferred embodiment, the heat exchanger 4 shown is provided as a free-cooler temperature control unit. With free-cooler temperature control unit is preferably meant in relation to the described embodiments, a device that exclusively uses the ambient temperature, in particular the temperature of the ambient air, to cool the process means. For this purpose, the freecooler temperature control unit may preferably comprise an air-process medium heat exchanger, e.g. in the form of an air cooler. It may be sufficient if the heat exchanger is a passive convection heat exchanger. It is also conceivable that ambient air or other gases, such as e.g. Compressed air, to be actively blown on cooling elements of the heat exchanger.

In FIG. 5 an embodiment of the free cooler temperature control is shown, in which a blowing device 41, preferably an impeller, outside air via a process agent chamber can be painted. It is also conceivable that the blowing device 41 is configured as a suction device, which sucks air, for example by cooling fins of the heat exchanger.

This process chamber is part of the process means circuit 3, which is directly flowed through coming from the printing press process means, which is then forwarded to an additional processing unit 2.

Further, a control unit 46 is provided, which determines the temperature difference between the air temperature and the process temperature by two temperature sensors 44, 45 and the blower 41 in response to this temperature difference (on / off and / or speed).

In FIG. 6 Furthermore, an embodiment of the free-cooler temperature control is shown, in which in addition to the blowing device 41, a bypass line 43 is provided. In this particularly preferred embodiment, the process medium may be partially or completely passed through the bypass line, for example when the process temperature is above the air temperature. For this purpose, a valve 42 is provided which can be controlled via the control unit 46. Depending on the embodiment, the valve 42 may be configured, for example, as a proportional valve, so that the amount of the volume flow is adjustable, or eg as a three-way valve, so that a pure switching function is given.

It is also conceivable that the aspect of the bypass line 43 without a blowing device 41 is realized.

It is also conceivable that further temperature sensors, e.g. in the direction away from the free cooler temperature control line, in addition to one of the described temperature sensor 44, 55 or alternatively to one or both temperature sensors 44, 55 are provided.

The described embodiments have the advantage that a particularly good cleaning is achieved by the flotation, which means that even at elevated process temperatures a tendency to contamination of the dampening solution in the circuit can be eliminated even with a reduction of the isopropanol content. The flotation device can be supplemented or replaced by a degerminator. By such a cleaning, it is possible in particular to operate dampening solution with a reduced alcohol content at ambient temperature without having to cool by chillers.

Therefore, in one of the described embodiments of the arrangement, the method according to the invention can be carried out, which comprises the temperature control of the dampening solution to the respective ambient temperature and the activation of the sterilization device as a function of the ambient temperature in such a way, that an impurity caused by an elevated temperature of the process agent is removed.

LIST OF REFERENCE NUMBERS

1

press

10

dampening

2

treatment unit

3

Process center circle

31

feeder

32

Return line

4

heat exchangers

41

blower

42

Valve

43

bypass line

44

first temperature sensor

45

second temperature sensor

46

control unit

5

Process medium line

7

second process middle circle

71

leader

72

returns

8th

Process solution cleaning apparatus

81

filter unit

82

defoamers

9

flotator

Claims (15)

Arrangement on a printing press (1) comprising a process agent cleaning device (8), a process fluid line (5) connecting the process agent cleaning device (8) and the printing press (1), and a degermination device. Arrangement according to claim 1, wherein the process-fluid line (5) is part of a process-center circuit (3; 7) and wherein the arrangement further comprises a treatment device (2), wherein the process-center circuit (3; 7) has a flow (71; 31) which Process means of the processing unit (2) coming from the printing machine (1) zuleitet, and wherein the process means circuit (3; 7) has a return (72; 32), which discharges processing means from the printing machine (1) to the processing unit (2). Arrangement according to one of the preceding claims, wherein the process agent cleaning device (8) comprises a filter unit (81). Arrangement according to one of the preceding claims, wherein the sterilization device comprises a UV radiation source and / or a radio wave radiation source and / or a heating device and / or an ultrasound source. Arrangement according to one of the preceding claims, which further comprises a heat exchanger (4) which is provided for controlling the temperature of the process means in the process medium circuit. Arrangement according to claim 5, wherein the heat exchanger (4) is a free-cooler temperature control, wherein the free-cooler temperature control is provided in the process medium circuit, that it is flowed through by the process agent to be cooled. Arrangement according to claim 6, wherein the free-cooler temperature control is deactivated when the temperature of the processing means in the portion of the process medium line (5) leading from the printing machine (1) to the free-cooler temperature control unit, is higher than the air temperature of the air, which Cooling of the free cooler temperature control unit is used. Arrangement according to one of the preceding claims 6 to 7, which further comprises a bypass line (43) through which processing means on the free cooler temperature control device is vorbeileitbar. Arrangement according to claim 8, which further comprises a valve (42), via which a process medium flow into the free cooler temperature control unit or the bypass line (43) can be introduced or distributed to the free cooler temperature control unit and the bypass line (43). Arrangement according to FIG. 9, which furthermore has a first temperature sensor (44), which is designed and arranged such that the process temperature can be detected via the first temperature sensor (44), the valve (42) and / or the blowing device (41) being dependent the detected process agent temperature is controllable and / or controllable. Arrangement according to claim 10, which further comprises a second temperature sensor (45), which is designed and arranged such that via the second temperature sensor (45), the air temperature is detectable, which is used for temperature control of the free cooler temperature control, wherein the valve (42) and / or the blowing device (41) can be controlled and / or regulated as a function of the detected air temperature. A method of operating an arrangement for supplying process agent to a printing press comprising the steps
Providing a device for supply of processing equipment to a printing machine comprising a sterilization device,
and
Disinfecting the process agent through the sterilization device. The method of claim 12, further comprising the steps of: Provision of a free-cooler temperature control unit, Temperieren the process agent to the respective ambient temperature by means of the free cooler tempering device. The method of claim 13, wherein the freecooler temperature control apparatus and the sterilization apparatus are provided configured as described in any one of claims 6 to 11. The method of any one of claims 12 to 14, wherein the method further comprises a heating step wherein process agent is heated to at least 60 ° C.

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