CN101495314B

CN101495314B - Printing unit of a web-fed rotary printing press

Info

Publication number: CN101495314B
Application number: CN2007800282237A
Authority: CN
Inventors: 乔治·施奈德; 贝尔恩德·库尔特·马祖赫; 沃尔夫冈·奥托·里德尔
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 2006-07-31
Filing date: 2007-07-26
Publication date: 2011-04-20
Anticipated expiration: 2027-07-26
Also published as: CN101495314A; WO2008015152A3; DE102006035504A1; EP2046578A2; 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

Printing unit with at least one printing unit of a web-fed rotary printing press

Technical Field

The invention relates to a printing unit having at least one printing unit of a web-fed rotary printing press.

Background

WO 00/54970a1 discloses a printing unit of a web-fed rotary printing press, in which according to a first embodiment an anilox roller is colored by means of a chambered doctor blade, the ink is transferred to a plate cylinder by means of an ink transfer roller or a rubber roller and the printed image is transferred to the printing material web by means of a further cylinder. According to another embodiment, the printing plate is colored on the plate cylinder by means of a conventional inking unit, such as a pump inking unit, an elevating inking unit or an oil film transfer unit, over two inking rollers each having a different diameter.

Known inking units for web-fed rotary printing presses are inking units for coloring a plate cylinder by means of an ink transfer roller, the circumference of which corresponds to the circumference of the plate cylinder. This works well for coldset lithography and also when waterless printing is performed with a sheet-fed printing press at speeds less than about 4 m/s. However, it is not possible to achieve the necessary ink density with a single contact strip to the anilox roller for the high ink viscosity necessary for waterless printing and for the high running speeds required for web-fed rotary presses.

DE 19731003B4 shows in fig. 17 a compressor inking unit with two plate cylinder-sized ink transfer rollers, which are colored by anilox rollers immersed in ink cartridges.

DE 3223352a1 describes a lithographic printing press for which the blanket cylinder, the plate cylinder, the inking rollers, the associated anilox roller and the dampening roller have the same diameter.

DE 3232780a1 and DE 3329331C2 each disclose an inking roller having the size of two plate cylinders.

DE 8224875U1 discloses an inking unit for a lithographic printing press, in which two plate-cylinder-sized inking rollers cooperate with an ink transfer roller.

WO 2005/097505a2 discloses a printing unit with two printing units, the cylinders of which are located in a straight line. Two inking rollers are respectively matched with the plate cylinder. Each of the ink form rollers is in contact with an anilox roller. The chambered doctor blade is arranged laterally on the anilox roller.

Disclosure of Invention

The object of the invention is therefore to provide a printing unit with at least one printing couple of a web-fed rotary printing press.

According to one aspect of the invention, the printing unit has at least one printing couple of a web-fed rotary printing press, the printing couple having a plate cylinder carrying at least one printing plate, a transfer cylinder cooperating with the plate cylinder for transferring a printed image from the plate cylinder to a printing material web; and an inking unit for coloring the plate cylinder by means of ink, wherein the inking unit comprises an ink transfer roller for transferring ink, an ink supply device for supplying ink to the ink transfer roller, and inking rollers which cooperate with the ink transfer roller on the one hand and with the plate cylinder on the other hand for applying ink to the plate cylinder, wherein the inking unit comprises two inking rollers which cooperate with the ink transfer roller and the plate cylinder, wherein the circumference of the inking rollers differs from the circumference of the plate cylinder by less than 10%, wherein, when at least one printing unit is two, the printing material web is guided between the two transfer cylinders for two-sided printing, and wherein at least one of the two inking rollers of one of the two printing units and at least one of the two inking rollers of the other of the two printing units are arranged point-symmetrically with respect to the contact point of the two-sided printing unit consisting of the two printing units .

The advantages that can be achieved by the invention are, in particular, that even relatively high-viscosity inks can be applied to a printing material (for example a paper or a film to be printed) in sufficient density without offset (schabierfrei) even at high printing speeds.

In a preferred embodiment of the invention, it is provided that at least one of the inking rollers (preferably two inking rollers, at least the last inking roller) has a printing blanket (such as a sleeve printing blanket), wherein the printing blanket (such as a sleeve printing blanket) has a relatively high hardness, in particular a hardness of 50 to 70 shore a, such as 60 shore a.

For the reasons mentioned above, the printing device is also suitable for use in high-quality printing processes.

Since the short-circuit inking system technique without zone twisting produces very little printing waste in waterless printing, the system is particularly suitable for expensive printing materials, such as those typically used in package printing.

In the case of a double-sided printing unit according to the invention, the two chambered doctor blades of the two printing units are each arranged in a corresponding spatial position on the respective ink transport roller, and the two ink transport rollers run in the same direction, i.e. in particular in a downward or upward direction, respectively, so that the wiping process takes place in the same direction on the respective ink transport roller or on the respective chambered doctor blade, respectively, which has the advantage that the wiping process of the two chambered doctor blades is carried out in the same direction in each case in the two printing units of the double-sided printing unit.

Due to the compact construction and the small plate cylinder diameter (e.g. 197mm), the invention makes it possible to build a printing tower in the form of a compact tower that is not divided in the middle, on the basis of a double-sided printing device, while at the same time the printing cloth can be easily replaced. An advantage of such an alternative is that less space is required. A further advantage is that the printing material web is not obstructed during the plate change. The easy access and handling of the drum is very good for such a construction.

The invention relates in particular to printing presses for waterless offset printing, which print in "dry offset printing" by means of a waterless printing plate and comprise a short-path inking unit with inks, which are usually highly viscous, which can cause problems in terms of uniform printing. The printing unit therefore has no dampening agent supply.

Drawings

In the following, embodiments of the invention are explained in detail with the aid of the figures. Wherein,

FIG. 1 is a side view of a first embodiment of a duplex printing apparatus;

FIG. 2 is a side view of a second embodiment of a duplex printing apparatus;

FIG. 3 shows a side view of a printing press with a plurality of perfecting printing couples according to FIG. 1 or FIG. 2;

FIG. 4 is a side view of a printing tower with a plurality of blanket-to-blanket printing units according to FIG. 1 or FIG. 2;

FIG. 5 is a side view of a printing press with a printing tower according to FIG. 4;

fig. 6 a linear bearing arrangement of the drum.

Detailed Description

First, the embodiment according to fig. 1 is concerned. Fig. 1 shows a printing unit 01, which is designed in particular for driographic and/or offset printing, wherein the printing unit 01 is assigned to a web-fed rotary printing press, in particular a rotary offset printing press, which is not described in detail here, wherein the printing unit 01 has a perfecting unit 03 arranged on a machine frame 02, wherein the perfecting unit 03 comprises two printing couples 06; 07 for double-sided printing of a printing material web 04, such as a paper web 04 or a film web 04, in a recto-verso printing process.

Each of the printing devices 06; 07 comprises a forme cylinder 08 carrying at least one forme, in particular a forme cylinder 08 carrying at least one non-horizontal printing forme, a transfer cylinder 09, in particular a blanket cylinder 09, for transferring a print image from the forme cylinder 08 to a printing material web 04, and an inking unit 11, indicated as a whole by reference numeral 11, in particular designed as a short-path inking unit 11, which inking unit 11 serves for coloring the forme cylinder 08 with ink. The two printing devices 06; 07 the axes of the forme cylinder 08 and the transfer cylinder 09 are parallel to each other and preferably lie in a common plane. This plane may be vertical or approximately vertical in the case of the exemplary embodiments according to fig. 1 to 3, or may also be horizontal or approximately horizontal in the case of fig. 4 and 5, or may also be open at another angle. The plane can also have an opening angle of preferably 81 ° to 87 ° to the transport direction/running direction of the printing material web 04. The two printing devices 06; 07, during operation, the transfer cylinders 09 are arranged opposite each other at a contact point 20 (in particular a printing point 20) and the printing material web 04 to be printed is transported between the transfer cylinders 09.

The inks used are specifically designed for waterless lithographic printing. During waterless lithographic printing, the silicone layer on the outer surface of the plate acts as a "wet lithographic" hydrophilic area on which a wetting agent can be placed, thereby preventing the plate from absorbing ink. In general, the non-printing and printing areas of the printing plate are realized by forming areas of different surface tension when alternating with ink. Therefore, the ink used in the waterless lithographic process is an ink having characteristics different from those of the ink used in the conventional "wet lithographic printing", and particularly, an ink having a higher viscosity is used.

The viscosity of the ink is determined, for example, according to international standard ISO 12644: 1996 (E). The viscosity value can be determined, for example, by means of a bar viscometer according to the above-mentioned standard or, for example, according to hoppler (b) ((c))

) The measurement method is carried out with the aid of a falling ball viscometer. Viscosity is a measurement that is strongly temperature dependent. With increasing temperature, the viscosity of the ink decreases significantly in the temperature range which is important for the printing process, i.e. between 15 ℃ and 50 ℃, in particular between 22 ℃ and 40 ℃. The ink viscosity values suitable for the application according to the invention are suitably below 350 pa-sec, preferably between 10 pa-sec and 150 pa-sec at a temperature range between 22 ℃ and 40 ℃, preferably 27 ℃.

The ink used is preferably a heat-set ink which is dried in a dryer (for example a hot air dryer or a radiation dryer, in particular an ultraviolet dryer or an infrared dryer) which is arranged next to the printing unit 01 and is not shown in detail in fig. 1.

Two printing devices 06; 07 comprises an ink supply 12, in particular a chambered doctor blade 12, by means of which ink is applied to an ink transport roller 13, in particular an anilox roller 13, by means of the ink supply 12. The ink transfer roller 13 or the anilox roller 13 itself is operatively associated with two inking rollers 14; 16, the ink form roller 14; 16 itself is in contact with the associated plate cylinder 08 during operation, so that the ink passes through the two inking rollers 14; 16 are transferred from the anilox roller 13 onto the plate cylinder 08.

As shown, each ink form roller 14; 16 has the same circumference as the plate cylinder 08. For example, the ink form roller 14; the diameter of 16 may be 197mm in each case, as may the diameter of the plate cylinder 08. In addition, it can also be seen from the figure that the inking unit 11 or its inking rollers 14; 16. the arrangement of the anilox roller 13 and the chambered doctor blade 12 is symmetrical to the center line of the double-sided printing couples 03 running axially parallel, so that it can be seen that, in both printing couples 06; 07 the chambered doctor blade 12 is positioned laterally on the respective anilox roller 13 and the surface of each anilox roller 13 is turned up and down over each chambered doctor blade 12, so that the wiping process is carried out up and down on each anilox roller 13, respectively.

At least the ink form roller 14; 16 can be brought from the working position shown in fig. 1 into a rest position provided at least by the respective plate cylinder 08, in which the inking rollers 14; 16 are arranged in the operating position both against the anilox rollers 13 and against the plate cylinders 08. For this purpose, the ink form roller 14; the shaft of 16 is adjustably arranged in a known manner and therefore not explained in detail. The ink form roller 14; 16 can also be provided, for example, in a combination bearing comprising adjustable linear bearing means.

The embodiment according to fig. 2 corresponds to the embodiment according to fig. 1, wherein it can be seen from fig. 2 that the ink form rollers 14; 16 are arranged on a rocker device 17, which rocker device 17 can be controlled by an actuator 18, such as a piston-cylinder-element 18 which can be hydraulically or pneumatically controlled.

The exemplary embodiment according to fig. 3 describes a printing press with a plurality of (here 5) adjacently arranged printing units 01 according to fig. 1 or fig. 2, wherein a generally horizontally transported printing material web 04 is printed, for example, with black ink, cyan ink, magenta ink, yellow ink and varnish, starting from a standby cylinder 19, one after the other, via the 5 printing units 01, then transported for drying the heat-set ink via a suitable dryer 21 (for example, a hot air dryer 21 and/or an ultraviolet dryer 21 and/or an infrared dryer 21), and finally wound up on a take-up cylinder 22 for the printed printing material web 04. Uv ink is consumed for uv dryers.

Fig. 4 shows a printing tower 23 with a plurality of, in this case 4, double-sided printing units 03 according to fig. 1 or 2 or similar to fig. 1 or 2 arranged one above the other. The printing couples 03 are arranged here substantially horizontally and the printing material web 04 is transported here in a vertical direction from the bottom to the top through the 4 perfecting couples 03 for perfecting, for example, with 4 printing colors.

In the illustrated embodiment, two printing units 06 of each duplex printing unit 03; 07 are arranged below the associated forme cylinder 08, respectively, and the surface of the anilox rollers 13, on the other hand, pass through the associated chambered doctor blade 12 in the same direction, respectively, from bottom to top.

Fig. 5 shows a printing press with a printing tower 23 according to fig. 4, wherein a printing material web 04 is fed from below to the printing tower 23 by a web changer 24, the printed printing material web 04 leaves the printing tower 23 from above, is then fed through a dryer 26 (for example an ultraviolet dryer 26 or an infrared dryer 26), is then fed through a cooling roller arrangement 27, is then fed into a folder magazine 28, and is finally cut and folded in a folder 29.

The ink form roller 14; 16 has an elastic layer 15 having a hardness of 50-70 shore a on the roll body. The layer 15 is provided, for example, on a sleeve that can be moved from the ink form roller 14; the roll body of 16 was removed.

Two inking rollers 14 of the printing unit 06; 16 with two ink form rollers 14 of another printing unit 07; 16 are arranged point-symmetrically with respect to the contact point 20 of the perfecting unit 03.

The two printing devices 06; 07 the ink feed rollers 13 are arranged point-symmetrically with respect to the contact position 20 of the duplex printing unit.

The ink form roller 14; the circumference of 16 and the circumference of the forme cylinder 08 preferably differ by less than 10%, in particular by less than 5%, in each case.

In a particularly preferred embodiment, the ink form roller 14; the circumference of 16 differs from the circumference of the forme cylinder 08 by less than 3%, in particular by less than 1.5%.

The circumference of the ink transfer roller 13 is substantially the same as the circumference of the plate cylinder 08.

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

In a particularly preferred embodiment, the circumference of the ink transfer roller 13 differs from the circumference of the forme cylinder 08 by less than 3%, in particular by less than 1.5%.

At least one forme cylinder 08 and each transfer cylinder 09 have at least one respective actuator 31 for changing position (engagement or disengagement).

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

The ink form roller 14; each of the actuators 16 has at least one respective actuator 18 for positioning, which actuator 18 can be brought into and out of engagement with the associated forme cylinder 08.

Preferably, a single perfecting unit 03 is arranged in a machine frame 02.

List of reference numerals

01 printing unit

02 frame

03 double-sided printing device

04 printing material tape, paper tape, film tape

05-

06 printing device

07 printing device

08 forme cylinder, plate cylinder

09 transfer cylinder and blanket cylinder

10-

11 inking device, short ink path inking device

12 ink supply device and cavity type doctor blade

13 ink transfer roller, anilox roller

14 inking roller

15 layers of

16 inking roller

17 rocker device

18 piston-cylinder component, actuator

19 Standby roller

20 contact position, printing position

21 dryer, hot air dryer, ultraviolet ray dryer, and infrared ray dryer

22 receiving roller

23 printing tower

24 reel changer

25-

26 dryer, ultraviolet dryer, and infrared dryer

27 chill roll apparatus

Claims

1. A printing unit (01) has at least one printing couple (06; 07) of a web-fed rotary printing press, the printing couple (06; 07) having a forme cylinder (08) carrying at least one forme, a transfer cylinder (09) cooperating with the forme cylinder (08) for transferring a printed image from the forme cylinder (08) to a printing material web (04); and an inking unit (11) for coloring a forme cylinder (08) by means of ink, wherein the inking unit (11) comprises an ink transfer roller (13) for transferring ink, an ink supply device (12) for supplying ink to the ink transfer roller (13), and inking rollers (14; 16) cooperating on the one hand with the ink transfer roller (13) and on the other hand with the forme cylinder (08) for applying ink to the forme cylinder (08), wherein the inking unit (11) comprises two inking rollers (14; 16) cooperating with the ink transfer roller (13) and the forme cylinder (08), wherein the circumference of the inking rollers (14; 16) differs by less than 10% from the circumference of the forme cylinder (08), characterized in that, when there are two at least one printing device (06; 07) of the printing unit (01), the printing material web (04) is guided between two transfer cylinders (09) for double-sided printing, and at least one of the two inking rollers (14; 16) of one of the two printing units and at least one of the two inking rollers (14; 16) of the other of the two printing units are arranged point-symmetrically with respect to a contact point (20) of a double-sided printing unit (03) composed of the two printing units (06; 07).

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

3. Printing unit according to claim 1, wherein said inking device (11) is a short-circuit inking device (11).

4. Printing unit according to claim 1, wherein said ink supply means (12) is a chambered doctor blade (12).

5. Printing unit according to claim 1, characterised in that the printing means (06; 07) are designed for waterless lithography.

6. Printing unit according to claim 1, wherein the printing device (06; 07) has no dampening agent supply.

7. A printing unit according to claim 1, characterized in that the ink form rollers (14; 16) are movable between an operating position each abutting against the ink transfer roller (13) and the plate cylinder (08) and a rest position each being separated from at least the plate cylinder (08).

8. Printing unit according to claim 1, characterized in that at least one of the ink form rollers (14; 16) has an elastic layer (15) with a hardness of 50-70 shore a at its roll body.

9. Printing unit according to claim 1, characterized in that at least one of the form rollers (14; 16) has an elastic layer (15) which is arranged on a sleeve which can be removed from the roll body of the form roller (14; 16).

10. Printing unit according to claim 1, characterized in that at least one of the ink form rollers (14; 16) is designed as a sleeve printing blanket.

11. The printing unit of claim 10, wherein the printing cloth has a hardness of 50-70 shore a.

12. Printing unit according to claim 1, characterised in that the printing means (06; 07) are designed for printing with high viscosity inks.

13. The printing unit of claim 12, wherein said ink has a viscosity of less than 350 pascal seconds at a temperature of 27 ℃.

14. The printing unit of claim 13, wherein the ink has a viscosity between 10 pa-sec and 150 pa-sec at a temperature of 27 ℃.

15. Printing unit according to claim 1, characterized in that the ink transfer roller (13), the ink form roller (14; 16) and the ink feed devices (12) of the two printing units (06; 07) of the printing unit (01) are arranged such that the ink take-up is effected from the ink feed devices (12) by the ink transfer rollers (13) in each case with mutually coinciding spatial positions and in each case with mutually coinciding running directions of the respective surface portions of the ink transfer rollers (13).

16. Printing unit according to claim 1, wherein the ink transfer rollers (13) of the two printing couples (06; 07) are arranged point-symmetrically with respect to the contact position (20) of the perfecting print (03).

17. Printing unit according to claim 1 or 15, wherein in the area of the ink supply means (12) the running direction of the respective surface portion of the ink transfer roller (13) is downwards.

18. Printing unit according to claim 1 or 15, wherein the respective surface portions of the ink transfer roller (13) are running vertically upwards.

19. Printing unit according to claim 1, wherein in the two printing devices (06; 07) each of the ink supply devices (12) is positioned laterally on a respective ink transfer roller (13).

20. Printing unit according to claim 1, wherein the axes of the forme cylinder (08) and transfer cylinder (09) of the two printing units (06; 07) are located on a common plane.

21. Printing unit according to claim 1, wherein a dryer is provided after the printing unit (01).

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

23. A printing unit according to claim 1, characterized in that the circumference of the form rollers (14; 16) differs from the circumference of the plate cylinder (08) by less than 3%.

24. A printing unit according to claim 1, characterized in that the circumference of the form rollers (14; 16) differs from the circumference of the plate cylinder (08) by less than 1.5%.

25. A printing unit according to claim 1, characterized in that the circumference of the ink transfer roller (13) differs from the circumference of the plate cylinder (08) by less than 10%.

26. A printing unit according to claim 1, characterized in that the circumference of the ink transfer roller (13) differs from the circumference of the plate cylinder (08) by less than 5%.

27. A printing unit according to claim 1, characterized in that the circumference of the ink transfer roller (13) differs from the circumference of the plate cylinder (08) by less than 3%.

28. A printing unit according to claim 1, characterized in that the circumference of the ink transfer roller (13) differs from the circumference of the plate cylinder (08) by less than 1.5%.

29. Printing unit according to claim 1, wherein at least one plate cylinder (08) and each transfer cylinder (09) have at least one respective first actuator (31) for changing position.

30. Printing unit according to claim 1, wherein at least one plate cylinder (08) and each transfer cylinder (09) have their own linear bearing arrangement.

31. Printing unit according to claim 1, characterised in that each of the ink form rollers (14; 16) has at least one own second actor (18) for changing position.

32. Printing unit according to claim 1, characterized in that only one perfecting unit (03) is provided in one frame (02).