EP2326505B1 - Printing unit, and devices and method for controlling the temperature of a printing unit - Google Patents

Description

The invention relates to a printing unit and a method for tempering a printing unit according to the preamble of claim 1 or 15.

By the WO 2005/097504 A2 a printing unit constructed as a printing tower is known which has at least a plurality of printing units arranged on the same side of a web to be printed, the printing units each having an inking unit with at least one roller and, in some embodiments, a dampening unit.

In the DE 694 02 737 T2 is a temperature-controlled system for printing machines with several, each one color printing known as "towers" known printing works. For temperature control of all horizontally spaced printing units, a common cooling and heating system is provided, wherein a compression machine optionally provides both for cooling and heating purposes temperature control for the temperature control of inking rollers several printing units. This is done by optionally charging a heat exchanger with compressed, then cooled in a condenser and finally relaxed temperature control and in the other case a Byepass with not relaxed, and therefore hot tempering. In the heat exchanger is now either a cooling or heating of the rollers passing through secondary Temperiermittelkreislaufes. The regulation of the individual roller temperatures is carried out in each case via flow control of the temperature control circuit which concerns the roller by means of a temperature sensor and a control valve of each individual roller.

The EP 1 870 238 B1 relates to a tempering of a printing machine having a plurality of printing units, the printing units each having a plurality of dry offset printing units each having an anilox roll to be tempered of an inking unit. The anilox rollers to be tempered are each tempered by a respective tempering medium circuit driven by a pump, but in case of failure also in pairs per double pressure point. The respective Temperiermittelkreislauf is connected via valves either with a Heizwasserkreislauf or a cooling circuit, from which then for the correct temperature of the respective Temperiermittelkreislaufs in this via a remotely operated driven metering valve a required amount of heating or cooling agent is metered or exchanged. The forme cylinders of the printing unit can be tempered in pairs, individually or in larger groups of four, six or eight forme cylinders via a common temperature control circuit that is different from the ink roller circuits.

In the EP 06 52 104 A1 a temperature of Farbreibzylindern an I-printing unit is disclosed, wherein the distribution cylinder of the two printing units are tempered by a common Temperiermittelleitung. The temperature is controlled by the circulating tempering agent quantity, in that a regulating valve regulates the flow as a function of a temperature measured value which records the friction cylinder temperature.

By the EP 0 383 295 A2 a tempering of a roller via a primary and a secondary circuit is disclosed, wherein via a four-way valve temperature control is interchangeable.

The EP 1 008 448 A1 discloses a tempering of a printing machine with a tempering circuit, which contains a pump and a temperature sensor and in which a consumer of the printing machine can be integrated to its temperature. With the temperature control circuit, the temperature of the consumer within extremely narrow tolerances, for example, +/- 0.25 ° C, to be maintained at a desired value. Depending on the temperature actual value, a circulating quantity can be replaced by tempering medium originating from a temperature control fluid source.

By the GB 545 346 A discloses a device for heating of ink in the printing unit of a printing machine, wherein the ink in the Vorklagebehälter and the rollers of the printing unit of hot fluid to 80 ° C and more to be heated. For this purpose, a supply line coming from a tank and a discharge line leading back to the tank are provided, from each of which lines for the individual rolls and the color original container branch off.

The DE 44 29 520 A1 discloses in one embodiment, the temperature control of friction cylinders of multiple colors of a multi-color printing machine on branches of a same temperature control circuit, wherein in each branch a bypass line with valve is provided. The temperature of the circulating in the circulation temperature control takes place here by heat exchange via a heat exchanger with refrigerant a cooling unit.

The invention has for its object to provide a printing unit and a method for effective temperature control of a printing unit.

The object is achieved by the features of claim 1 and 15, respectively.

The achievable with the present invention consist in particular in that a printing unit, in particular operable in wet offset printing tower achieved with minimized quality variation in the product at low cost or temperature control of inking a printing unit with low technical effort and small amounts of resources in sufficient quality is.

It is also advantageous that a temperature of the printing unit is achieved, in which the circulating quantities and the need of coolant, for. As cold water, and / or that a higher temperature difference between the outer and inner temperature control can be realized.

In an advantageous embodiment, the pressure unit or their units to be tempered - comparable to the circulatory system of a central heating system - equipped with its own circuit with circulation pump, a particular motor mixer and a controller to the printing unit at a substantially constant (at least one in a allowed range lying) temperature between z. B. 23 ° C and 35 ° C, in particular 25 ° C and 30 ° C, and when heating the circuit temperature from a cold water circuit colder fluid, eg. B. cold water, mix.

In an advantageous embodiment of the circuit nutz the permanent heat of cabinets and / or drives and / or pumps to 'warm' the inking at standstill and / or in the start-up phase. As soon as the pressure unit produces more heat, cold water is mixed in via the controller and the circulation temperature within the pressure unit or within the circuit is kept constant (or at least within the permitted range).

In the present solution, it is z. B. not primarily to a process control of the printing process over the temperature (with dynamic setpoint changes and very narrow limits, as for example in the color flow control in the dry offset and / or when using anilox rollers). In contrast to this, it is primarily about the creation of constant pressure conditions at - especially fast-running - rotary printing machines with a limited effort and / or z. B. the ability to complete the temperature already in the factory installation to the connection on site to a supply circuit already in the module "printing unit". With the proposed tempering, it is possible to reduce quality fluctuations in the printed product and therefore the amounts of waste (eg ink and paper consumption) while at the same time minimizing the consumption of operating resources (eg fresh water) through closed cycles.

The proposed temperature control is therefore particularly advantageous in connection with operated in wet offset printing units, d. H. with printing units whose form cylinder cooperates with both an inking unit and a dampening unit.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

ein Ausführungsbeispiel für eine Temperierung von I-Druckeinheiten;

Fig. 2

ein Ausführungsbeispiel für eine Temperierung von Drucktürmen;

Fig. 3

a) ein erstes und b) ein zweites schematisches Beispiel für die Ausführung von Leitungszweigen des inneren Temperiermittelkreislaufs.

Show it:

Fig. 1

an embodiment of a temperature of I-pressure units;

Fig. 2

an embodiment of a temperature of printing towers;

Fig. 3

a) a first and b) a second schematic example of the embodiment of line branches of the inner Temperiermittelkreislaufs.

A printing machine, z. B. a web-fed rotary printing press, has a plurality of printing units 01, through which a substrate 02, z. B. a sheet-shaped substrate 02 or a web 02, in particular a paper web, one or both sides one or more colors can be printed. In the example of Fig. 1 are several as so-called.

I-printing units formed printing units arranged side by side in a substantially horizontally extending web path and bring on both sides in succession each a printed image of a color on the substrate 02 on. The printing units 01 each have two, here together as double printing units 03 acting together, printing units 04, each with a forme cylinder 06 and a transfer cylinder 07 running as a printing cylinder 06; 07 and a co-operating with the forme cylinder 06 inking unit 08. In the illustrated embodiment, the printing units 04 are formed as wet offset printing units 04 and have a co-operating with the forme cylinder 06 dampening 09. The said components are stored per unit of pressure 01 as a unit together in or on a frame.

In a particularly advantageous embodiment of the Fig. 2 form a plurality of stacked double printing as a printing tower 01, z. B. as a so-called "four-high tower", trained printing unit 01, wherein at substantially vertically extending web path on both sides successively each a print image of a color is applied to the substrate 02. Trained as a printing tower printing unit 01 can also be two stacked H-printing units (each with four printing units 04) or two stacked satellite printing units (each with four printing units 04) or at least four stacked bridge printing units in n, u or linear arrangement (each with two Have printing units 04). The printing units 01 could in principle be formed without dampening units, but in an advantageous embodiment, depending on the printing unit 04, besides the inking unit 08, also have a dampening unit 09, or, in addition to a color source, at least one of different dampening solution sources. In Fig. 2 this is shown as an example for all printing units 04 on only the left printing tower 01.

As in Fig. 1 and Fig. 2 each exemplified at only one of the printing units 04 indicated by shading, have the inking units 08 at least one, but especially as in the inking of Fig. 2 at least two and in the inking of the Fig. 1 even three tempered by liquid temperature control or to be tempered rollers 11, z. B. rollers 11 of the same type. The rollers 11 are formed, for example, as an oscillating cylinder 11 in the axial direction.

Each printing unit 01 is, for example, in a correspondingly closable space, at least one electrical control and / or supply device 12, z. B. commonly referred to with cabinet 12, provided.

Each printing unit 01 is at least one drive unit 13 for the rotary drive of the printing cylinder 06; 07 and possibly the ancillary equipment such as inking and / or dampening unit 08; 09 provided. In further developments, a plurality of drive units 13, z. B. a drive unit 13 per printing unit 04 or a drive unit 13 per unit of printing cylinders 06, 07 or advantageous per printing unit cylinder 06; Be provided 07, in which case the inking and / or dampening 06; 07 from a printing cylinder 06; 07 forth, or advantageous by at least one further own drive unit 13, z. B. respectively, is driven or are. Advantageously, at least one of the distribution cylinders 11 of the inking unit 08 is rotationally driven by a drive unit 13, which is mechanically independent of the printing unit cylinders, and optionally a distribution cylinder of the dampening unit 09 is likewise rotationally driven by a drive unit 13 which is mechanically independent of the printing unit cylinders.

The drive unit 13 has z. B. a motor with drive controller and / or power unit. Preferably, at least one drive unit 13, for. B. are at least the printing cylinder 06; 07 driving (s) drive unit (s) 13, but in particular all the printing cylinder 06; 07 as well as ink and possibly dampening units 08; 09 operational, d. H. formed in the production, rotationally driving drive units 13, tempered by liquid temperature control.

The two printing units 04 of an above-mentioned I-printing unit are mounted in or on a common frame 14. In the case of in Fig. 2 shown tower construction are z. B. at least four printing units, here advantageously eight printing units 04 stored in or on a common frame 14.

In order to keep the printing conditions constant for the ink, each printing unit 01 is provided with its own temperature control circuit 16, referred to here as the inner temperature control circuit 16 (also referred to as the "secondary circuit"). The temperature control of this inner Temperiermittelkreises 16 runs in this cycle - comparable to a building heating - in a quasi-closed circuit. Only in case of deviation of the cycle temperature from a setpoint is corrected from the outside by adding and removing small quantities.

At least one to be tempered roller 11 of each printing unit 04 of the printing unit 01, in particular at least all of the rollers 13 of the same type of printing unit 01, preferably all to be tempered rollers 11 of the inking units 06 of the printing unit 01, connected to and are at their inner temperature control Temperature control with the relevant inner temperature control circuit 16 in thermal contact. The thermal contact is made, for example, via appropriate, permitting a passage of the roller 11 with temperature control agent, which will not be discussed here in detail.

In a preferred embodiment, one or more of the printing cylinder 06; 07 and / or color and / or existing dampening units 08; 09 operatively rotatory driving drive units 13 for heat exchange with the temperature control in this inner Temperiermittelkreis 16 - for example via corresponding contact heat exchanger such. B. a coolant coil or a corresponding traversed space - integrated. In addition, or instead of the control cabinet 12 may be integrated into the inner temperature control circuit 16. This can, for example, via suitable means for heat transfer, such. B. a thermal contact with a socket carrying the electronic components or a mounting plate, respectively.

The inner Temperiermittelkreis 16 has a temperature control means driving pump 17, z. Circulation pump 17, a temperature sensor 19 signal-connected to a control device 18, at least one line 21 or line branch 21 connected to one or more of the components to be tempered (eg roller (s) 11 and / or drive unit (s) 13) .i and at least one also connected to the control device 18 signal technically remotely operable valve 22, z. B. a Mehrwege-, in particular four-way mixing valve 21, on, by means of which temperature control at least in the inner Temperiermittelkreis 16 is metered. The control device 18 acts on a drive of the valve 22, which may be formed for example as a motor or as a magnetically actuated opener / closer.

The control devices 18 can via a common control and / or regulating device, not shown, their setpoint specification and / or maximum value specification for the temperature to be maintained. In an embodiment, not shown, in the inner Temperiermittelkreis 16, z. B. between valve 22 and to be temperierendem consumers (roller 11), in particular between valve 22 and a supply distributor 23 specified in more detail below, a particular electric heater (eg., A so-called "heating cartridge") be provided with which z. B. temporarily before and / or during startup of the machine additional heat in the inner Temperiermittelkreis 16 can be introduced. These, if any, is then signal-technically connected to the control device 18 and can be characterized by this with respect to the setpoint or maximum value to be complied with, then z. B. as a target value to be controlled.

In principle, all components tempered by the inner tempering means circuit 16, ie rollers 11 and / or switching cabinet 12 and / or drive units 13, can be connected in series by a single line 21. It is advantageous in terms of avoiding an excessively large temperature gradient between the first and last component However, in the case of in particular a plurality of rollers to be tempered 11, when the temperature control circuit 16 - z. B. downstream of the pump 17 - at a flow distributor 23 in several parallel lines 21.i, z. B. branches or briefly: branches 21.i shares, which reunite after thermal contact with the components to be tempered (11; 12; 13) to a return header 24. Flow distributor 23 and return collector 24 are then part of the inner Temperiermittelkreises 16 and are preferably assigned only to the tempered by this Temperiermittelkreis 16 printing unit 01.

In the event that one or more electric drive units 13 of this printing unit 01 and / or the cabinet 12 is also in thermal contact with the inner Temperiermittelkreislauf 16, and that used at least for the standstill or a start-up phase, the waste heat of these units for preheating the rollers 11 is to be, it may be advantageous if in each case at least one roller 11 temperating line branch 21.i and a drive unit 13 and / or the cabinet 12 is thermally coupled.

In Fig. 1 and 2 is the coupling of the inner Temperiermittelkreises 16 via one or more lines 21; 21.i indicated by dashed lines only schematically.

In Fig. 3 a) exemplified an embodiment, wherein in at least one, in particular in all at least one roller 11 temperierendem line branches 21.i and a drive unit 13 is integrated. Preferably, a thermal contact with a drive unit 13 (and / or the control cabinet 12) is initially provided by the flow distributor 23 downstream of contact with a roller 11.

In Fig. 3 b) an embodiment is set forth, which has a merely drive units 13 einbindenden line branch 21.1. This brings then at standstill or the start of the - still "cold" - pressure unit 01 heat in the Temperiermittelkreislauf 16th one. The flow distributor 23 and / or return collector 24 can then possibly take over the function of a mixing chamber between the cold and warm circulating streams.

Between the two in Fig. 3a) and 3b) Depending on the existing structural circumstances and / or energy requirements, the cases described in Fig. 3 a) and Fig. 3 b) illustrated line branches 21.i mixed versions possible.

In an advantageous embodiment of the pressure unit 01 designed as a printing tower 01, the rolls 11 to be tempered are all (here four) double printing units 03 with a first line branch 21.1, and the drive units 13 of this double printing units 03 to be tempered with a second line branch 21.2 different from the first-mentioned line branch 21.1 thermal contact, so that for the temperature of the rollers 11 and the drive units 13 of the printing unit 01 of the Temperiermittelkreis 16 at the flow distributor 23 in a total of two line branches 21.1; 21.2 shares.

In a likewise advantageous embodiment of the pressure unit 01 designed as printing tower 01, the rolls 11 to be tempered are all (here four) printing units 04 cooperating with the same web page with a first line branch 21.1, and the drive units 13 to be tempered of these printing units 04 cooperating with this web page with a different from the first-mentioned line branch 21.1 second line branch 21.2 in thermal contact. In the second mentioned one or more switching and / or regulating devices (eg switch boxes or cabinets (12) can then be integrated to their tempering.) The same applies to the co-operating with the other web page printing units 04 in the same way, so that for the pressure unit 01 of the temperature control medium circuit 16 at the flow distributor 23 divides into a total of four line branches 21.1, 21.2 Particularly advantageous with a separable in the sense of pressure unit 01, wherein the printing units 04 of a first web page carrying side frames and the printing units 04 of the second web side bearing side frames are mutually variable - the printing unit 03 is thus moved apart in the area of their pressure points.

Especially in the latter two embodiments is in the printing tower 01 for the first and the second line branch 21.1; 21.2 provided in each case one connected to the flow distributor 23 riser and a first-mentioned and connected to the return collector 24 downpipe, wherein z. B. the riser and downpipe of the or the drive units 13 tempering line branches (s) 21.2 on the drive units 13 having (front) side, z. B. drive side, the pressure unit 01, and the riser and downcomers of the or the rollers 11 tempering line branches (s) 21.1 on the other side, z. B. operating page, run. Preferably, in this case are to be tempered drive units 13 of the same printing unit 04 (or in the first case of the same double printing unit 03), z. B. the drive unit (s) of the inking and / or dampening unit and the drive unit (s) of the printing cylinder (eg., In this order), serially tempered by a loop with a removal from the riser and a return to the down pipe. For each of the printed by the branch 21.2 tempering printing units 04 (or in the first case double printing unit 03) then z. B. parallel to such, the drive units 13 tempering line loop provided. In the case of several rolls 11 to be tempered per printing unit 04, these can in principle be tempered in the same way per printing unit serially by a loop per printing unit 04 and parallel to the printing units 04 connected to the line branch 21.1. In an advantageous embodiment, however, each to be tempered roller 11 a separate, connected to the respective riser and down pipe line loop are provided in parallel.

For all the above-mentioned embodiments having several line branches 21.i, in the line branches 21.i, in particular in at least n-1 of a total of n branches, advantageously a device, not shown, for adjusting the line resistance, z. B. an adjustable throttle valve may be provided. This can, for. B. once during commissioning or even given the occasion, a sufficient flow through all, possibly different line resistances having line branches 21.i be ensured. These devices need not be controllable or remotely operable, but may be manually operable. They are also not made dependent on a temperature of a component to be tempered, but merely to influence the distribution of the volume flows through the branches. The same applies to the above-mentioned embodiment with further division in line loops on the arrangement of such throttle valves in these loops. These may then be provided instead of or in addition to the erstgenanten throttle valves.

In the inner temperature control circuit 16, therefore, a volume flow is not influenced by a control valve for operational temperature control in dependence on a component temperature, but a circulating, substantially constant volume flow in response to exceeding a limit temperature of the circulating tempering dosed a temperature control lower temperature, or a part the circulating volume flow exchanged by metering and removal.

As described above, the inner Temperiermittelkreislauf 16 each printing unit 01 tempering (in particular temperature control other, preferably lower temperature) as needed from an external source 26, z. B. an outer Temperiermittelkreislauf 26 (or "primary circuit"), z. B. supply circuit 26, in response to a signal of the temperature sensor 19 by means of acting on the valve 17 control device 18 are metered. The inner temperature control circuit 16 is in this way preferably to a temperature of the temperature control - in particular at a measuring point between the valve 22 and the first component to be tempered, preferably at a point downstream of the pump 17 - of about 25 ° C to 30 ° C. regulated.

The supply circuit 26 is preferably also designed as a "quasi-closed" system and has a temperature control medium driving pump 27, z. B. circulating pump 27, and a cold source 28 or heat sink 28, z. B. a heat exchanger 28 or in particular a cooling unit 28 (possibly chiller), as well as for several, each a pressure unit associated inner Temperiermittelkreisläufe 16 sampling points 31 in a flow line 33 and return points 32 in a return line 34. Preferably, the supply circuit 26 and the heat exchanger 28 is operated such that the temperature control in the flow line 33 is a temperature of z. B. 8 ° to 17 °, in particular 10 ° C to 15 ° C. ist.lst the cooling source 28 in an advantageous embodiment as a refrigerator, for. Example, as a compression refrigeration engine, so may be provided in a particularly advantageous development in the return line 34 between the last return point 32 and the chiller 28, not shown, means for pre-cooling the return. In the simplest way, this can be done in the manner of a free cooler outside the building "Register", z. B. coil coiled tubing, trained return section of the return line 34 itself, which by outside air, for. B. by forced flow by means of a blower, possibly under Besprühung with water, is cooled. In another embodiment, however, a separate coolant circuit with a free cooler (possibly with the possibility of spraying with water) may be provided in outdoor installation, which is in thermal contact via a disposed between the last return point 32 and the refrigerator 28 heat exchanger with the temperature control of the return line.

In the supply circuit 26 may advantageously be provided a pressure equalizing vessel 29 shown by way of example, which buffers the temperature fluctuations associated hereby the pressure fluctuations. In contrast to the representation, the surge tank 29 may preferably in the flow line 33 between pump 27th and the first extraction point 31 may be arranged. In this case, a second pressure equalizing vessel 29 can advantageously be provided in the return line 34 between the last return point 32 and the cold source 28.

Further, in an advantageous development in the supply circuit 26 between the last removal point 31 and first return point 32, a valve, not shown, for. B. an adjustable throttle valve may be provided to produce a pressure difference between the flow line 33 and return line 34.

The temperature of the printing unit (s) 01, wherein both rollers 11 and drive units 13 and / or the cabinet 12 are integrated in the inner temperature control, is now z. B. operated as follows: In a phase during standstill, z. B. in a standby mode, or a start-up phase of the printing unit 01, the inner temperature control circuit 16 is operated as a closed system. At the already in standby and / or already rotating drive units 13 of still in pressure-off position located printing units 04, the circulating temperature of the inner Temperiermittelkreislaufs 16 is heated (without an inflow or outflow of temperature control from the outer Temperierkreislauf 26) in turn warms the also connected to be tempered rollers 11. Now warm up - z. B. after the pressure on - after some time through the operation of the components to be tempered (11, 12, 13) such that the temperature of the circulating temperature control exceeds the control unit 18 of the control circuit 19, 18, 22 predetermined limit, so will Temperature control from the outer, colder Temperiermittelkreislauf 26 in the inner Temperiermittelkreislauf 16 by temporarily opening - z. B. the corresponding channel - the valve 17 is added and on the other hand taken a corresponding amount of the Temperiermittelkreislauf 16. In this way, the temperature of the inner Temperiermittelkreises 16, and thus the temperature of the tempered by these components 11; 12; 13 constant, or at least within a permissible temperature range held.

LIST OF REFERENCE NUMBERS

01

Printing unit, printing tower

02

Substrate, curved, web

03

Double printing

04

printing unit

05

-

06

Form cylinder, printing cylinder

07

Transfer cylinder, printing cylinder

08

inking

09

dampening

10

-

11

Roller, distribution cylinder

12

electrical control and / or supply device, control cabinet

13

Drive unit, rotary

14

frame

15

-

16

Temperiermittelkreislauf, inner

17

Pump, circulating pump

18

control device

19

temperature sensor

20

-

21

management

22

Valve, multi-way mixing valve, four-way mixing valve

23

Flow manifold

24

Return collector

25

-

26

Temperature control circuit, supply circuit

27

Pump, circulating pump

28

Cooling source, heat sink, heat exchanger, cooling unit

29

The pressure equalizing vessel

30

-

31

sampling point

32

return point

33

lead line

34

Return line

21.i

Line, line branch (i = 1, 2, ...)

Claims (18)

1. Printing unit, which comprises at least a plurality of printing mechanisms (04) designed as wet offset printing mechanisms (04) arranged on a same side of a web (02) to be printed, which in each case comprise an inking unit (08) having at least one roll (11) and a damping unit (09), an internal temperature control agent circulation with a pump (17) and a temperature sensor (19) being provided, rolls (11) of inking units (08) of several printing mechanisms (04) of a same side of a web (02) to be printed of this printing unit (01) being in thermal contact for their temperature control with a same internal temperature control circulation (16), and the internal temperature control agent circulation (16) being designed with an essentially constant circulating volume flow of temperature control agent such that on exceeding a threshold temperature of the temperature control agent circulating in the internal temperature control circulation (16) a temperature control agent of lower temperature from a supply circuit (26) is exchangeable by metered addition and removal, and temperature control agent from the supply circuit (26) designed as an internal temperature control circulation (16) designed as an external temperature control circulation (26) being meterable by means of at least one remotely operated multiway mixing valve (22).
2. Printing unit according to Claim 1, characterised in that at least one regulating valve (22) is provided in the temperature control agent circulation (16), by means of which a part of the circulating volume is replaceable by temperature control agent of the lower temperature level from the one supply circuit (26).
3. Printing unit according to Claim 1, characterised in that all rolls (11) of the same type, in particular all rolls (11) designed as friction cylinders (11), of at least all printing mechanisms (04) of the printing unit (01) arranged on a same side of a web (02) to be printed are in thermal contact for their temperature control with the same internal temperature control circulation (16).
4. Printing unit according to Claim 1, 2 or 3, characterised in that the inking units (08) of the printing mechanisms (04) in each case have at least two rolls (11) of the same type to be temperature controlled, and the same type rolls (11) of the inking unit (11) to be temperature-controlled are in thermal contact with the same internal temperature control agent circulation (16).
5. Printing unit according to Claim 1, characterised in that an electrical drive unit (13) of this printing unit (01) and/or an electrical control device (12) of this printing unit (01) are/is in thermal contact with the same internal temperature control agent circulation (16).
6. Printing unit according to Claim 1, characterised in that at least the rolls (11) of the same type, in particular the rolls (11) designed as friction cylinders, of the inking units (08) of all printing mechanisms (04) of the printing unit (01) are in thermal contact with the same internal temperature control circulation (16).
7. Printing unit according to Claim 1, characterised in that the temperature control agent and the external temperature control agent circulation (26) is meterable by means of a control device (18) acting on the valve (17) as a function of a signal of the temperature sensor.
8. Printing unit according to Claim 1 or 7, characterised in that the internal temperature control agent circulation (16) divides downstream of the pump (17) at a flow manifold (23) into several parallel branch lines (21.i), which combine again in a return collector (24) after thermal contact with the components to be temperature-controlled.
9. Printing unit according to Claim 5 or 8, characterised in that rolls (11) to be temperature-controlled and drive units (13) and/or control devices (12) to be temperature-controlled are arranged in parallel-circuit branch lines (23.i) that are different from one another of the same temperature control agent circulation (16).
10. Printing unit according to Claim 9, characterised in that the rolls (11) to be temperature-controlled of inking units (08) arranged on different sides of the web (02) are in operative connection with branch lines (23.i) that are different from one another of the same temperature control agent circulation (16).
11. Printing unit according to Claim 1, characterised in that the external temperature control agent circulation (26) has a pump (27) and a cold source (28).
12. Printing unit according to Claim 1, characterised in that the external temperature control agent circulation has removal sites (31) for several internal temperature control circulations (16), in each case assigned to a printing unit (01).
13. Printing unit according to Claim 1, characterised in that the printing unit (01) is designed as a printing tower essentially vertically passed through by a web (02), having at least eight printing mechanisms (04) and/or four double printing mechanisms (03) arranged one above the other.
14. Printing unit according to Claim 13, characterised in that rolls (11) of the inking units (08) of all printing mechanisms (04) of the printing tower (01) are in thermal contact to the same internal temperature control agent circulation (16).
15. Method for the temperature control of rolls of a printing unit, which comprises at least a plurality of printing mechanisms (04) designed as wet offset printing mechanisms (04) arranged on a same side of a web (02) to be printed, and which in each case comprise an inking unit (08) having at least one roll (11) and a damping unit (09), characterised in that rolls (11) of inking units (08) of several print mechanisms (04) arranged on a same side of a web (02) to be printed are temperature controlled by a same internal temperature control agent circulation (16), essentially a constant volume flow of temperature control agent circulating in the internal temperature control agent circulation (16), and for the maintenance of an allowed temperature or for achieving a temperature to be achieved a part of the volume circulating in the internal temperature control agent circulation (16) is replaced by temperature control agent of another temperature level from a supply circulation (26).
16. Method according to Claim 15, characterised in that in one phase during the stoppage or a start-up phase of the printing unit (01) the internal temperature control agent circulation (16) is operated as a closed system and the temperature control agent circulates in the internal temperature control agent circulation (16) without an inflow or outflow of temperature control agent.
17. Method according to Claim 16, characterised in that in one phase during the stoppage or a start-up phase of the printing unit (01) heat is introduced into the circulating temperature control agent by means of an activable heating device in operative connection with the internal temperature control agent circulation (16).
18. Method according to Claim 15 or 16, characterised in that temperature control agent from an external temperature control agent circulation (26) is metered into the internal temperature control agent circulation (16) as soon as the temperature of the temperature control agent recirculating in the internal temperature control agent circulation (16) exceeds a determinable threshold value.

Images