EP2046578A2

EP2046578A2 - Printing unit of a web-fed rotary printing press

Info

Publication number: EP2046578A2
Application number: EP07787932A
Authority: EP
Inventors: Georg Schneider; Bernd Kurt Masuch; Wolfgang Otto Reder
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 2006-07-31
Filing date: 2007-07-26
Publication date: 2009-04-15
Also published as: CN101495314B; CN101495314A; WO2008015152A3; DE102006035504A1; WO2008015152A2

Abstract

The invention relates to a printing unit (01) having at least one press unit (06; 07) of a web-fed rotary printing press having a forme cylinder (08) which carries at least one printing forme, a transfer cylinder (09) which interacts with the forme cylinder (08) for transferring printing images from the forme cylinder (08) onto a printing-material web (04), and having an inking unit (11) for inking the forme cylinder (08) by means of printing ink, wherein the inking unit (11) comprises an ink transfer roll (13) which transfers printing ink, a printing-ink supply device (12) for supplying printing ink to the ink transfer roll (13), and an ink applicator roll (14; 16) which interacts firstly with the ink transfer roll (13) and secondly with the forme cylinder (08) for applying printing ink onto the forme cylinder (08), wherein the inking unit (11) comprises two ink applicator rolls (14; 16) which interact with the ink transfer roll (13) and the forme cylinder (08), wherein the circumference of the ink applicator rolls (14; 16) is in each case substantially identical to the circumference of the forme cylinder (08).

Description

description

Printing unit of a web-fed rotary printing machine

The invention relates to a printing unit of a web-fed rotary printing press according to the preamble of claim 1.

From WO 00/54970 A1 a printing unit of a web-fed rotary printing press is known, wherein after a first embodiment an anilox roll is inked by means of a chambered doctor blade, the ink is transferred by means of a ink transfer roller or blanket roll to a forme cylinder and the print image via another cylinder on a printing substrate is transmitted. According to a further embodiment, the coloring of the printing plates on the forme cylinder by means of a conventional inking unit, z. As pump, elevator or film inking unit on two inking rollers, each having different diameters.

In connection with web-fed rotary printing presses, inking units are known which colorize the forme cylinder with a ink transfer roller whose circumference corresponds to the circumference of the forme cylinder. This works well in cold-set wet offset as well as, at low speeds up to about 4 m / s in waterless printing on sheetfed presses. However, in the case of high-viscosity printing inks, which are required in connection with waterless printing, and the high speed required by web-fed rotary printing presses, it is not possible to achieve the required color density with a single contact strip to the anilox roller.

The DE 197 31 003 B4 shows in Figure 17, an inking unit of a printing press with two form cylinder-sized inking rollers, which are colored by a dipping into an ink fountain roller. DE 32 23 352 A1 describes a planographic printing machine, in the blanket cylinder, plate cylinder, inking roller, associated anilox roller and dampening roller have the same diameter.

DE 32 32 780 A1 and DE 33 29 331 C2 each disclose two form cylinder-sized inking rollers.

The invention has for its object to provide a printing unit of a web-fed rotary printing press.

The object is achieved by the features of claim 1.

The achievable with the present invention consist in particular in the fact that it is now possible, even inks of comparatively high viscosity stencil-free in sufficient density even at high printing speeds on the substrate, z. B. to bring the paper to be printed or the film to be printed.

In a preferred embodiment of the invention, it is provided that at least one of the inking rollers, preferably both inking rollers, but at least the last-applying inking roller, with a blanket, z. B. sleeve blanket is equipped, wherein the blanket, z. B. sleeve blanket has a relatively high hardness, in particular a hardness of 50 to 70 Shore (A), for example, of about 60 Shore (A).

For this reason, the inking unit is also suitable for use with high print quality.

After the short inking technique without zone screws in waterless printing produces very low proof waste, this system is particularly suitable for expensive substrates, as they often occur in packaging printing. In the invention, in the case of a double printing unit in both printing units, the two chamber doctor blade, each arranged in a corresponding spatial position on the respective ink transfer roller, and the directions of movement of the two ink transfer rollers are each rectified, ie in particular each downwards or upwards, so that the Abrakelung the ink is carried on the respective ink transfer roller or the respective chamber doctor blade in the same direction, which has the advantage that in both printing units of the double printing the Abrakelung in both chamber doctor blades each runs the same.

The invention makes it possible to build a printing tower as a compact tower without separation in the middle, in which even the blanket can be easily replaced due to the compact design and the small plate cylinder diameter of, for example, 197 mm on the basis of double printing. The advantage of this variant is that it requires a small footprint. Another advantage is the fact that when printing plates no substrate web is a hindrance. The accessibility and operation of the cylinder is very good in this construction.

In particular, the invention relates to printing machines with waterless offset printing, which thus print in the "dry offset" by means of waterless planographic printing plates and a short inking unit with i.d.R high-viscosity inks, the uniform printing can pose difficulties.

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

Show it: 1 is a side view of a first embodiment of a double printing;

Fig. 2 is a side view of a second embodiment of a double printing unit;

Fig. 3 is a side view of a printing machine with a plurality of double printing units according to Fig. 1 or 2;

Fig. 4 is a side view of a printing tower with a plurality of double printing units according to Fig. 1 or 2;

Fig. 5 is a side view of a printing machine with a printing tower of Fig. 4;

Fig. 6 is a linear bearing of a cylinder.

First, reference is made to the embodiment of FIG. 1 reference. 1 shows a particularly designed for waterless planographic printing and / or offset printing unit 01 of a rotary printing machine, not shown here in detail, in particular a web-fed rotary offset printing machine, arranged on a machine frame 02 double printing unit 03, which two printing units 06; 07 for printing on both sides of a substrate web 04, such as a paper web 04 or a film web 04 in perfecting includes.

Each printing unit 06; 07 comprises a plate cylinder 08 bearing at least one printing plate, in particular a plate cylinder 08 carrying at least one waterless planographic printing plate, a transfer cylinder 09 transferring the printing image from the forme cylinder 08 to the printing material web 04, in particular a blanket cylinder 09, and a total denoted by the reference numeral 11, in particular as a short inking unit 1 1 formed inking unit 1 1 for coloring the Forming cylinder 08 with printing ink. The axes of the forme cylinder 08 and the transfer cylinder 09 of the two printing units 06; 07 are parallel to each other and are preferably in a common plane. As in the case of the exemplary embodiments according to FIGS. 1 to 3, this plane can be clamped vertically or approximately vertically or else, as in the case of FIGS. 4 and 5, horizontally or approximately horizontally, or possibly also at another angle be. The plane can also include an opening angle of preferably 81 ° to 87 ° with the transport direction / running direction of the printing material web 04. The transfer cylinder 09 of the two printing units 06; 07 are in operation in a contact point 20, in particular pressure point 20 against each other and lead between them the printing substrate 04 to be printed.

The inks used are specially designed for waterless offset printing. In waterless offset printing z. B, a silicone layer on the surface of a printing form, the role of the wet-settable hydrophilic area of the "wet offset" to prevent the printing form from picking up color Generally, the non-printing areas and the printing areas of the printing form become areas of different surface tensions For this reason, in waterless offset printing processes printing inks are used whose properties differ from printing inks used in conventional "wet offset", in particular printing inks having a higher viscosity are used.

The viscosity of the ink is z. B according to the standard ISO 12644: 1996 (E). Their value can be z. B according to the above standard with a bar viscometer or z. B with the measuring method according to Höppler be determined with a falling ball viscometer. The viscosity is a highly dependent on the temperature variable. As the temperature increases, printing inks show a significant drop in their viscosity in the temperature range between 15 ° C and 50 ° C, in particular between 22 ° C and 40 ° C, which is relevant for the printing process. The value of the viscosity is for use in Conveniently associated with the present invention, printing inks in the temperature range between 22 ° C and 40 ° C, preferably of 27 ° C, below 350 Pa ^* s, in particular between 10 Pa ^* s and 150 Pa ^* s.

The printing inks used are preferably heatset inks which are dried in a dryer downstream of the printing unit 01, not shown in detail in FIG. 1, for example a hot air dryer or radiation dryer, in particular a UV (ultraviolet) dryer or IR (infrared) dryer ,

Each of the two inking units 1 1 of the two printing units 06; 07 comprises an ink supply device 12, in particular a chamber doctor blade 12, by means of which ink is applied to a ink transfer roller 13, in particular an anilox roller 13. The ink transfer roller 13 or anilox roller 13 in turn is in operation with two inking rollers 14; 16 in contact, which in turn are in operation with the associated forme cylinder 08 in engagement, so that on the two inking rollers 14; 16 ink is transferred from the anilox roller 13 to the forme cylinder 08.

As can be seen from the drawing, the circumference of each of the inking rollers 14; 16 equal to the circumference of the forme cylinder 08. For example, the diameter of the inking rollers 14; 16 as well as the diameter of the forme cylinder 08 are each 197 mm. As can further be seen from the drawing, the arrangement of the inking units 1 1 and their inking rollers 14; 16, anilox rollers 13 and chamber doctor blade 12 symmetrically with respect to an axially parallel center line of the double printing unit 03, which results in that in both printing units 06; 07 of the respective chamber doctor blade 12 is laterally positioned on the corresponding anilox roller 13 and the surface of the respective anilox roller 13 passes from top to bottom past the respective chamber doctor blade 12, so that the Abrakelung the ink to the respective anilox roller 13 takes place from top to bottom. At least the inking rollers 14; 16 are from their shown in Fig. 1 functional position in which they rest against both the respective anilox roller 13 and the respective forme cylinder 08, in a parked at least from the respective forme cylinder 08 rest position, in which they can be maintained, for example. For this purpose, the axes of the inking rollers 14; 16 stored in a known per se and therefore unspecified manner, as is known per se, for example, from WO 2004/103704 A2. The inking rollers 14; 16 may for example also be stored in storage units comprising controllable linear bearings.

The embodiment according to FIG. 2 corresponds to that according to FIG. 1, wherein it can be seen from FIG. 2 that the inking rollers 14; 16 are mounted on pivot lever devices 17, which via actuators 18, z. B. hydraulically or pneumatically actuated piston-cylinder assemblies 18 are actuated.

The embodiment of FIG. 3 shows a printing machine with several, here five juxtaposed printing units 01 shown in FIG. 1 or 2, wherein the total horizontally guided printing substrate 04 coming from a supply roll 19, the five printing units 01 successively for printing z. B. with the colors black, cyan, magenta, yellow and lacquer, then for the purpose of drying the heatset printing inks through a suitable dryer 21, z. B. a hot air dryer 21 and / or a UV dryer 21 and / or an IR dryer 21 is guided and then wound on a pickup roller 22 for printed substrate web 04. In UV dryers UV ink is printed.

Fig. 4 shows a printing tower 23 with a plurality, here four stacked double printing units 03 according to or similar to Fig. 1 and 2. The individual double printing units 03 are aligned here approximately horizontally and the Substrate web 04 is here in the vertical direction from bottom to top through the four double printing units 03 z. B. for double-sided printing with four inks.

In this embodiment, the short inking units 1 1 of both printing units 06; 07 of the respective double printing units 03 each disposed below the associated forme cylinder 08, in turn, the surface of the respective anilox roller 13 in each case the same direction on the associated chambered doctor blade 12 passes, in this case from bottom to top.

FIG. 5 shows a printing press with a printing tower 23 according to FIG. 4, wherein the printing material web 04 is fed from below to the printing tower 23 by a roll changer 24, the printed printing material web 04 leaves the printing tower 23 at the top, then through a dryer 26, for example a UV Dryer 26 and IR dryer 26 is guided, then passes through a cooling roller device 27, then enters a Falzwerk hopper 28 and finally cut in a folding unit 29 and folded.

At least one of the inking rollers 14; 16 has an elastic layer 15 with a hardness of 50-70 Shore A on its bale. This layer 15 is arranged, for example, on a sleeve, the bale of the inking roller 14; 16 is removable.

At least one of the two inking rollers 14; 16 of a printing unit 06 is with respect to the contact point 20 of the double printing unit 03 point-symmetrical to at least one of the two inking rollers 14; 16 of the other printing 07 arranged.

The ink transfer roller 13 of the two printing units 06, 07 is arranged point-symmetrically with respect to the contact point 20 of the double printing unit. Preferably, each of the circumference of the inking rollers 14 differs; 16 of the circumference of the forme cylinder 08 less than 10%, in particular less than 5%.

In a particularly preferred manner, each of the circumference of the inking rollers 14 differs; 16 of the circumference of the forme cylinder 08 less than 3%, in particular less than 1, 5%.

The circumference of the ink transfer roller 13 is substantially equal to the circumference of the forme cylinder 08.

Preferably, the circumference of the ink transfer roller 13 differs from the circumference of the forme cylinder 08 less than 10%, in particular less than 5%.

In a particularly preferred manner, the circumference of the ink transfer roller 13 differs from the circumference of the forme cylinder 08 less than 3%, in particular less than 1, 5%.

At least one forme cylinder 08 and each transfer cylinder 09 each have at least one own actuator 31 for changing the position (pressure ON or pressure AB).

At least one forme cylinder 08 and each transfer cylinder 09 have their own linear bearing 32.

Each of the inking rollers 14; 16 each has at least one own actuator 18 for positioning, which allows the on or off to the associated forme cylinder 08. Preferably, only a single double printing unit 03 is arranged in a machine frame 02.

LIST OF REFERENCE NUMBERS

01 printing unit

02 Machine frame

03 double printing unit

04 substrate web, paper web, film web

05 -

06 printing unit

07 printing unit

08 form cylinder, plate cylinder

09 transfer cylinder, rubber cylinder

10 -

1 1 inking unit, short inking unit

12 printing ink feeding device, chamber doctor blade

13 ink transfer roller, anilox roller

14 inking roller

15 shift

16 inking roller

17 pivot lever device

18 piston-cylinder arrangement, actuator

19 supply roll

20 touch point, pressure point

21 dryers, hot air dryers, UV dryers, IR dryers

22 pickup roll

23 printing tower

24 reelstands

25 -

26 dryers, UV dryers, IR dryers

27 cooling roll device Falzwerk hopper folding unit - actuator linear bearing

Claims

1 1Applications

1. printing unit (01) with at least one printing unit (06; 07) of a web-fed rotary printing press with a forme cylinder (08) carrying at least one printing form, a transfer cylinder (09) cooperating with the forme cylinder (08) for transferring print images from the forme cylinder (08) a printing substrate (04) and with an inking unit (1 1) for inking the forme cylinder (08) by means of ink, wherein the inking unit (1 1) comprises a ink-transferring ink transfer roller (13), an ink supply means (12) for supplying ink to the ink transfer roller (13), as well as an on the one hand with the ink transfer roller (13) and on the other hand with the forme cylinder (08) cooperating inking roller (14; 16) for applying printing ink on the forme cylinder (08), characterized in that the inking unit (1 1) two comprising inking rollers (14; 16) cooperating with the ink transfer roller (13) and the forme cylinder (08), the circumference of the inking rollers (14; Inking rollers (14; 16) is substantially equal to the circumference of the forme cylinder (08).

2. Printing unit according to claim 1, characterized in that the ink transferring ink transfer roller (13) is an anilox roller (13).

3. Printing unit according to claim 1 or 2, characterized in that the inking unit (1 1) is a short inking unit (1 1).

4. Printing unit according to one of the preceding claims, characterized in that the Druckfarbenzuführeinrichtung (12) is a chambered doctor blade (12).

5. Printing unit according to one of the preceding claims, characterized in that the printing unit (06; 07) is designed for waterless planographic printing. 1 2

6. Printing unit according to claim 1, characterized in that the printing unit (06, 07) has no dampening solution supply.

7. Printing unit according to one of the preceding claims, characterized in that the inking rollers (14; 16) between their respective, on the ink transfer roller (13) and the forme cylinder (08) adjacent functional position and their respective, at least from the forme cylinder (08) parked rest position are movable.

8. Printing unit according to claim 1, characterized in that at least one of the inking rollers (14; 16) has on its bale an elastic layer (15) with a hardness of 50 to 70 Shore (A).

9. Printing unit according to claim 1, characterized in that at least one of the inking rollers (14; 16) has an elastic layer (15), wherein the elastic layer is arranged on a removable from the bale of the inking roller (14: 16) sleeve.

10. Printing unit according to one of the preceding claims, characterized in that at least one of the inking rollers (14; 16) is equipped with a sleeve blanket.

1 1. Printing unit according to claim 10, characterized in that the blanket has a hardness of 50 to 70 Shore (A).

12. Printing unit according to one of the preceding claims, characterized in that the printing unit (06; 07) is designed for the printing of high-viscosity inks. 13

13. Printing unit according to claim 12, characterized in that the printing inks at a temperature of 27 ° C have a viscosity below 350 Pa ^* s.

14. Printing unit according to claim 13, characterized in that the printing inks at a temperature of 27 ° C have a viscosity between 10 Pa ^* s and 150 Pa ^* s.

15. Printing unit according to claim 1, characterized in that the printing unit (01) has two printing units (06, 07), wherein the printing material web (04) for double-sided printing between two transfer cylinders (09) is guided.

16. Printing unit according to claim 15, characterized in that the ink transfer rollers (13) and the inking rollers (14; 16) and the Druckfarbenzuführeinrichtungen (12) of the two printing units (06; 07) of the printing unit (01) are arranged so that the recording of ink by the respective ink transfer roller (13) from the respective Druckfarbenzuführeinrichtung (12) in each corresponding spatial position and in each corresponding movement direction of the corresponding surface portion of the ink transfer roller (13) takes place.

17. Printing unit according to claim 1, characterized in that at least one of the two inking rollers (14; 16) of the one printing unit (06) with respect to the contact point (20) of the double printing unit (03) point symmetrical at least one of the two inking rollers (14; other printing unit (07) is arranged.

18. A printing unit according to claim 15, characterized in that the ink transfer rollers (13) of the two printing units (06; 07) with respect to the contact point (20) of the double printing unit (03) are arranged point-symmetrically. 14

19. Printing unit according to claim 1, 16 or 17, characterized in that the direction of movement of the corresponding surface portion of the ink transfer roller (13) in the region of the ink supply device (12) is in each case down.

20. A printing unit according to claim 1, 16 or 17, characterized in that the direction of movement of the corresponding surface portion of the ink transfer roller (13) is substantially vertically upwards.

21. Printing unit according to claim 1, characterized in that in the two printing units (06; 07) the respective chamber doctor blade (12) is positioned laterally on the corresponding detent roller (13).

22. Printing unit according to claim 1 or 2, characterized in that the axes of the forme cylinder (08) and transfer cylinder (09) of the two printing units (06, 07) lie in a common plane.

23. Printing unit according to claim 1, characterized in that the printing unit (01) is followed by a dryer.

24. Printing unit according to claim 1, characterized in that the circumference of the inking rollers (14; 16) differs in each case less than 10% from the circumference of the forme cylinder (08).

25. Printing unit according to claim 1, characterized in that the circumference of the inking rollers (14; 16) differs in each case less than 5% from the circumference of the forme cylinder (08). 15

26. Printing unit according to claim 1, characterized in that the circumference of the inking rollers (14; 16) differs in each case less than 3% from the circumference of the forme cylinder (08).

27. A printing unit according to claim 1, characterized in that the circumference of the inking rollers (14; 16) differs less than 1, 5% from the circumference of the forme cylinder (08).

28. Printing unit according to claim 1, characterized in that the circumference of the ink transfer roller (13) is substantially equal to the circumference of the forme cylinder (08).

29. A printing unit according to claim 28, characterized in that the circumference of the ink transfer roller (13) differs less than 10% of the circumference of the forme cylinder (08).

30. A printing unit according to claim 28, characterized in that the circumference of the ink transfer roller (13) differs less than 5% of the circumference of the forme cylinder (08).

31. Printing unit according to claim 28, characterized in that the circumference of the ink transfer roller (13) is less than 3% of the circumference of the forme cylinder (08).

32. Printing unit according to claim 28, characterized in that the circumference of the ink transfer roller (13) differs less than 1, 5% of the circumference of the forme cylinder (08).

33. Printing unit according to claim 1, characterized in that at least one 1 6

Form cylinder (08) and each transfer cylinder (08) each have at least one own actuator (31) for changing position (pressure ON or pressure AB).

34. Printing unit according to claim 1, characterized in that at least one forme cylinder (08) and each transfer cylinder (08) has its own linear bearing.

35. Printing unit according to claim 1, characterized in that each of the inking rollers (14; 16) in each case has at least one own actuator (18) for changing the position.

36. Printing unit according to claim 1 or 15, characterized in that in a machine frame (02) only a single double printing unit (03) is arranged.