WO2009103599A1

WO2009103599A1 - Method for inking a printing forme in a processing machine

Info

Publication number: WO2009103599A1
Application number: PCT/EP2009/050969
Authority: WO
Inventors: Peter Hummel; Robert Ortner; Jürgen Schölzig
Original assignee: Manroland Ag
Priority date: 2008-02-23
Filing date: 2009-01-29
Publication date: 2009-08-27
Also published as: JP5473948B2; CN101945766A; CN101945766B; JP2011512280A; DE102008010803A1

Abstract

The invention relates to a method for inking a printing forme in a processing machine for stocks. The aim of the invention is to devise a method that especially allows ink to be metered in a stable manner in a universally usable inking unit while noticeably reducing the ghosting tendency. Said aim is achieved by having a feeding roller (20) of the distribution roller (8) additionally feed the flow of ink to a first oscillating ink roller (6) of the first partial roller train (12), said first oscillating ink roller (6) supplying the front inking rollers (2, 3) in the direction of rotation of the plate/form cylinder (1), the first partial flow of ink allocated to the first partial roller train is diverted on the distribution roller (8) by means of at least one ink transport roller (15) and is fed to the first oscillating ink roller (6) of the first partial roller train (12). Furthermore, the second partial flow of ink allocated to the second partial roller train is diverted on the distribution roller (8) by means of at least one ink transport roller (16) and is constantly fed to a second oscillating ink roller (7) supplying the rear inking rollers (4, 5) in the direction of rotation of the plate/form cylinder (1).

Description

Process for coloring a printing form in a processing machine

The invention relates to a method for coloring a printing form in a processing machine for substrates according to the preamble of the independent claim.

From EP 0 280 957 A2 an inking unit for a printing unit in an offset printing machine is known. The printing unit comprises a plate cylinder having a printing plate, wherein a dampening unit can be assigned to the plate cylinder. The inking unit comprises a distributor roller arranged in the roller train for the ink feed and two sub-roller trains arranged in parallel downstream of this distributor roller. The ink stream is divided from the distributor roller by means of two partial roller trains in two partial color streams and the two partial color streams are fed to a front in the direction of rotation of the plate / forme inking roller for coloring the printing plate.

A method and a device for color guidance are known from DE 102 48 517 A1 or from EP 0 741 024 A2. Thereafter, an inking roller train comprises a distributor roller and two sub-roller trains arranged in parallel downstream of said distributor roller and each having at least one inking roller in contact with a printing plate. The partial rolling trains can be separated at at least one nip so that temporarily the ink stream can be supplied to at least one of the inking rollers via the first or the second partial drawing train. Such color flow separations can prevent a change in the ink layer thickness profile in ongoing inking at printing interruptions. After elimination of the print interruption, the rollers are re-set together at the start of printing, so that the original color flow is restored. The invention is based on the object to provide a method of the type mentioned above, which allows in particular a stable color guide in a universally applicable inking and noticeably reduces the tendency for stenciling.

The problem is solved by the training features of claim 1. Further developments will become apparent from the dependent claims.

As is known, the stenciling is an error phenomenon during printing, in which a structure of the printing form - offset in the printing direction - one or more times additionally images.

A first advantage of the solution according to the invention therefore lies in the fact that, especially in the case of difficult printing plates and / or special printing inks, such as metallic inks or inks that absorb excessively dampening solution, these irregularities when coloring a printing forme are avoided or at least noticeably reduced.

A second advantage is due to the fact that, starting from a distributor roller arranged in the roller train of an inking unit, the color flow in the printing operation or the planned ink flow is already influenced in a targeted manner even before the start of printing (in the case of machine standstill). For this purpose, in the inking unit, the amount of ink (color flow) supplied in the direction of the printing form can be supplied in variable ink flow proportions to the respective inking rollers. Thus, color flow components can be realized, which result in different working methods of the inking unit, a different load distribution of the ink flow in the inking unit. The inking unit is universally applicable for a variety of Drucksujets, responsive and the existing inking rollers remain preferred - despite different switching positions - always in the respective color flow.

Starting from a feed roller upstream of the distributor roller in the direction of color flow, the ink flow can branch off adjacent to the distributor roller Partial ink streams are additionally supplied to the first inking roller as part of the first part roller train. As a result, a front-heavy designed inking can be created. That is, at least first and preferably second inking roller in the direction of rotation of the plate / forme cylinder ink is supplied with a relatively high ink flow rate and the remaining reduced ink flow rate is the other, for example third and fourth and optionally further, inking rollers supplied.

Another such inking unit with a relatively even higher ink flow rate on the first and second inking rollers can be provided by temporarily separating the feed roller from the distributor roller and feeding the ink stream directly from the feed roller to the first inking roller as part of the first sub-roller train. From the first inking roller, the ink stream is split onto the first and second inking rollers and, via further ink transport rollers enclosing the distributor roller, to the second, third and fourth (optionally fifth) inking rollers.

In a further embodiment, a color transport roller of the first partial color flow can be separated at a separation point from the first partial color flow and preferably temporarily integrated into the second partial color flow. In this way, a relatively high proportion of ink flow can be supplied to the first and second inking rollers in the direction of rotation of the plate / forme cylinder. The remaining reduced ink flow content is supplied to the further, for example third and fourth and optionally further, inking rollers.

It is furthermore advantageous that, given a possible occurrence of stenciling phenomena during printing, the inking unit can be selectively operated by switching processes of the ink transport rollers downstream of a distributor roller in a first and second partial roller train, if necessary also inking rollers, the inking unit in unipartite working methods can. Likewise, by switching positions of the color flow to the distributor roller transporting feed roller can be acted on the color flow components. Thus, the feed roller can be ner working manner with the distributor roller in contact or the feed roller is separated from the distributor roller and the ink supply takes place via the feed roller directly into the branch of the distributor roller first Teilwalzenzug. In this way, a relatively high proportion of ink flow can be supplied to the first and second inking rollers in the direction of rotation of the plate / form cylinder. The remaining reduced ink flow content is supplied to the further, for example third and fourth and optionally further, inking rollers.

In a further embodiment, a color transport roller of the first part color flow can be temporarily separated at a separation point from the first part of color flow and remain without any contact with adjacent rollers in the inking or the ink transport roller can be temporarily removed from the inking unit. In this case, the color flow is branched from the feed roller to the distributor roller and the first ink distributor roller.

With these universal methods of operation, possible stenciling phenomena can be avoided or at least significantly reduced with simultaneously stabilized color guidance. A change in the color flow can be carried out in any mode of operation during machine downtime as well as during printing operation.

The invention will be explained in more detail using an exemplary embodiment. Here are shown schematically:

1 is an inking unit of an offset printing machine,

Fig. 2 to 6, the inking unit in a further embodiment.

According to FIG. 1, an inking unit for an offset printing press is shown which, inter alia, comprises a dye metering / feeding device 10. This Farbdosier- / feeder 10 may preferably be formed by a paint box with metering device and with ink fountain roller and a Farbheberwalze or a film inking roller. The ink fountain roller or the film inking roller is preferably provided with a four- th inking roller 9 in operative connection. At least one compactor 11 with a plurality of ink-transfer rollers and a feed roller 20, which form a first ink stream, are arranged downstream of the fourth ink-jet roller 9 in the direction of ink flow. This first color flow is transferred by means of feed roller 20 to a downstream distributor roller 8, wherein this distributor roller 8 may preferably be designed as a third ink driver roller 8.

When viewed in Farbflusshchtung splits the further roller train at the distributor roller 8 and thus the color flow over two subordinate, designed as branch rollers ink transfer rollers 15, 16 into a first and a second partial roller train 12, 13 and thus the color flow divided into two partial color streams. Each of the sub-roller trains 12, 13 may include a plurality of ink-transfer rollers as needed. The first part roller train 12 and thus the first partial ink flow is fed to front in the direction of rotation of the plate / forme cylinder 1 inking rollers 2, 3. The first partial roller train 12 preferably comprises at least one ink transport roller 15 adjacent to the distributor roller 8 as a branch roller and one in

Direction of rotation of the plate / forme cylinder 1 both front inking rollers 2, 3 supplying first inking roller 6. About the ink transfer roller 15, the first part ink stream on the first inking roller 6 and seen in the direction of rotation of the plate / forme cylinder 1 subsequent front, first and second inking rollers. 2 3 supplied to the inking unit.

Furthermore, the second partial roller train 13 in the direction of rotation of the plate / forme cylinder 1 is formed at least by the ink transport roller 16 designed as a second branch roller and a second ink driver roller 7 arranged downstream of it. The second inking roller 7 is downstream of a third and a fourth inking roller 4, 5 in the direction of rotation of the plate / forme cylinder 1, wherein both inking rollers 4, 5 are bridged by the second inking roller 7. About the ink feed roller 16 is thus supplied to the second ink fountain roller 7, the second partial ink flow to the two inking rollers 4, 5. Preferably, the second inking roller 3 and the third inking roller 4 with a two inking rollers 3, 4 bridging ink transfer roller 17 in contact. The supplied from the feed roller 20 of the distributor roller 8 ink flow is additionally fed from the feed roller 20 in the direction of rotation of the plate / forme cylinder 1 of the front inking rollers 2, 3 supplying, first inking roller 6 of the first partial color flow 12. As mentioned, the first part ink stream 12 is branched off at the distributor roller 8 by means of at least one ink transport roller 15 and temporarily fed to the first ink roller 6 of the first component ink stream 12, so that the ink distributor roller 6 generates a partial ink flow over the first partial roller train 12 and a partial ink flow from the ink flow of the roller train 11 is supplied with feed roller 20.

The second partial ink flow 13 is branched off at the distributor roller 8 by means of at least one ink transfer roller 16 and constantly supplied in the direction of rotation of the plate / forme cylinder 1 of the second, second ink jet roller 7 supplying the rear, third and fourth inking rollers 4, 5.

From the inking rollers 2 to 5, the color is supplied to the plate / forme cylinder 1. The plate / form cylinder 1 carries a fixable on the lateral surface printing plate, for example as a printing plate or sleeve. Alternatively, a printing form can be produced, fixed and preferably erased on the lateral surface of the plate / forme cylinder 1.

All Farbreiberwalzen 6 to 9 are rotationally and / or axially iridescent drivable. All inking rollers 2 to 5 are driven by friction and are formed on / off adjustable. If necessary, the inking rollers 2 to 5 can be formed axially iridescent, wherein the traversing movement can also be stopped. The first, third and fourth inking rollers 2, 4 and 5 can be assigned individually, in groups or as a whole smoothing rollers 19 as needed.

For wet offset printing, a dampening unit 14 may be arranged upstream of the inking unit 14 in the direction of rotation of the plate / forme cylinder 1.

The supplied from a feed roller 20 of the distributor roller 8 ink flow is additionally in the direction of rotation of the plate / forme cylinder 1 of the front Farbauf- supporting rollers 2, 3 supplying, first inking roller 6 of the first part roller train 12 supplied. In this case, the first partial roller train 12 branches off with its first partial ink flow at the distributor roller 8 by means of at least one ink transport roller 15 and is fed to the first ink roller 6 of the first partial roller train 12. The second partial roller train 13 branches off with its second partial ink flow at the distributor roller 8 by means of at least one ink transfer roller (16) and the second partial ink stream is constantly fed in the direction of rotation of the plate / forme cylinder 1 to a second inking roller 7 supplying the rear inking rollers 4, 5. The first partial roller train 12 and thus the first partial color flow can be temporarily separated. Thus, the partial ink flow to the first inking roller 6 is temporarily interrupted by the distributor roller 8.

Starting from the basic embodiment shown in Fig. 1, depending on the print job and / or the theological conditions supplied by the roller train 11 ink stream at a separation point 21 between the feed roller 20 and the distributor roller 8 temporarily interrupted, wherein the feed roller 20 with the first ink roller 6 in Contact remains (Fig. 2). Thus, the first ink stream fed from the roller train 11 (with feed roller 20) is temporarily fed to the first inking roller 6 and from this inking roller 6 (first partial roller train 12) the ink flow is split over the ink transport roller 15, distributor roller 8 and ink transfer roller 16 onto the second inking roller 7 (FIG. second sub-roller train 13) with downstream inking rollers 4, 5 and to the inking roller 6 downstream inking rollers 2, 3. In such an operation can be shown in FIG. 2 Farbflussanteile of approximately 80% of the first and second inking roller 2, 3, while according 1, ink flow rates of approximately 70% are supplied to the first and second inking rollers 2, 3. The remaining ink flow components are each supplied to the third and fourth inking rollers 4, 5 proportionally.

Alternatively, as shown in FIG. 5 while maintaining the separation point 21 (feed roller 20 and distributor roller 8) of the first part roller train 12 are temporarily interrupted at a separation point 18 between the distributor roller 8 and the ink transfer roller 15. In this case, the ink transport roller 15 remains in contact with the adjacent first inking roller 6. The ink transfer roller 15 is temporarily brought into contact 5 with the ink transfer roller 17 bridging the second and third inking rollers 3, 4, so that ink supply takes place from the first inking roller 6 via the ink transfer roller 15 to the ink transfer roller 17.

In a further embodiment according to FIG. 3, the first part ink flow 12 can be temporarily interrupted at least at a separating point 18 between at least the ink transport roller 15 and the first inking roller 6. In addition, the first part ink flow 12 between the distributor roller 8 and the ink transfer roller 15 can be temporarily interrupted at a further separation point 18. In this case, in a further embodiment, the ink transfer roller 15 of the first partial roller train 12 can be temporarily separated from the first partial ink flow at at least one separation point 18 and remain in the inking unit without any contact with the adjacent rollers. Furthermore, the ink transport roller 15 can be temporarily removed from the inking unit. In this case, the color flow is branched onto the distributor roller 8 and the first inking roller 6 by the feed roller 20. In such an operation, according to FIG. 3, ink flow components of approximately 70% can be supplied to the first and second inking rollers 2, 3. The remaining ink flow portions are respectively approximately equal to equal proportions of the third and fourth inking roller 4, 5 proportionally supplied.

In a further embodiment according to FIG. 4, the ink transfer roller 15 of the first partial roller train 12 can be temporarily brought into contact with an adjacent ink transport roller 17 which supplies the second and third inking roller 3, 4 in the direction of rotation of the plate / forme cylinder 1. For this purpose, the first part-roller train 12 is temporarily interrupted at a separation point 18, in particular between the ink-transporting roller 15 and the first inking roller. In this case, the ink transfer roller 15 remains in contact with the distributor roller 8, so that the first partial ink flow branching off from the distributor roller 8 is temporarily replaced by the color transfer roller. portsportwalze 17 and the downstream inking rollers 3, 4 is supplied.

In such an operation, as shown in FIG. 4, ink flow components of approximately 70% can be supplied to the first and second inking rollers 2, 3. The remaining ink flow portions are each proportionally supplied to the third and fourth inking roller 4, 5, wherein the ink flow rate at the fourth inking roller 5 is the lowest.

In a further embodiment according to FIG. 6, the ink flow from the feed roller 20 is fed to the distributor roller 8 and additionally to the first inking roller (6) of the first partial roller train 12. The first part roller train 12 can be temporarily separated at a separation point 18 between the distributor roller 8 and the adjacent ink transport roller 15. In this case, the ink transport roller 15 remains in contact with the adjacent inking roller 6 and the ink transfer roller 15 is temporarily brought into contact with the in the direction of rotation of the plate / forme cylinder 1 second and third inking roller 3, 4 bridging ink transfer roller 17 in contact. Since the ink transfer roller 15 is in contact with the distributor roller 8, the partial ink flow branching off from the first ink distributor roller 6 is temporarily supplied via the ink transfer roller 15 to the ink transport roller 17 and the downstream inking rollers 3, 4.

In all the modes of operation described, the second partial roller train 13 always remains in contact with the distributor roller 8. The second partial roller train 13 is formed at least by the ink transport roller 16 and the inking roller 7.

After completion of the print job, alternatively in the printing operation, the color flow can be switched to the basic version of FIG. LIST OF REFERENCE NUMBERS

1 plate / form cylinder

2 first inking roller 3 second inking roller

4 third inking roller

5 fourth inking roller

6 first inking roller

7 second inking roller 8 distributor roller (third inking roller)

9 fourth inking roller

10 paint dosing / feeding

11 compactor (first color flow)

12 first partial roller train (first partial color flow) 13 second partial roller train (second partial color flow)

14 dampening unit

15 ink transfer roller (first branch roller)

16 ink transfer roller (second branch roller)

17 ink transfer roller 18 separation point (first partial color flow)

19 smoothing roll

20 feed roller

21 separation point (first color flow)

Claims

claims

1. A method for coloring a printing form in a processing machine for substrates, with an inking unit and optionally a dampening unit and a printing plate having plate / forme cylinder, wherein the inking unit comprises a Farbdosier- and Farbzuführeinrichtung, at least one compactor and inking rollers for inking the printing form and the ink stream is fed to a distributor roller, divided into two partial ink streams at the distributor roller by means of two partial roller trains, and one of the two partial ink streams is supplied to a front of the plate / forme cylinder inking roller, characterized in that the ink flow from a feed roller (20 ) of the distributor roller (8) and additionally in the direction of rotation of the plate / forme cylinder (1) one of the front

Ink roller (2, 3) supplying, first inking roller (6) of the first part roller train (12) is fed, that the first Teilwalzenzug (12) branched off with its first part ink stream at the distributor roller (8) by means of at least one ink transfer roller (15) and the first Inking roller (6) of the first part roller train (12) is fed, and that the second part roller train (13) with its second partial ink flow at the distributor roller (8) by means of at least one ink transport roller (16) is branched off and the second partial ink flow in the direction of rotation of the plate / Form cylinder (1) of the rear inking rollers (4, 5) supplying, second inking roller (7) (13) is supplied.

2. The method according to claim 1, characterized in that the first part roller train (12) is temporarily separated.

3. The method according to claim 1, characterized in that the ink flow at a separation point (21) between the feed roller (20) and the distributor roller (8) is temporarily interrupted, wherein the feed roller (20) with the first ink roller (6) in contact remains.

4. The method according to claim 1, characterized in that the first part roller train (12) at least one of the distributor roller (8) adjacent ink transport roller (15) and in the direction of rotation of the plate / forme cylinder (1) both front inking rollers (2, 3) supplying first inking roller (6).

5. The method according to claim 2, characterized in that the first part roller train (12) is temporarily interrupted at least at a separation point (18) between at least the ink transport roller (15) and the first inking roller (6).

6. The method according to claim 2, characterized in that the first part roller train (12) at a further separation point (18) between the distributor roller (8) and the adjacent ink transport roller (15) is temporarily interrupted.

7. The method according to claim 2 and 3, characterized in that the first part roller train (12) at a separation point (18) between the distributor roller (8) and the adjacent ink transport roller (15) is separated, the ink transport roller (15) with the adjacent inking roller (6) remains in contact and the ink transfer roller (15) with a second and third inking roller (3, 4) bridging ink transfer roller (17) is temporarily brought into contact.

8. The method according to claim 2, characterized in that the first part roller train (12) at a separation point (18) between the distributor roller (8) and the adjacent ink transport roller (15) is separated, the ink transport roller (15) with the adjacent inking roller (6) remains in contact and the ink transfer roller (15) with a second and third inking roller (3, 4) bridging ink transfer roller (17) is temporarily brought into contact.