EP1341669B1 - Coating device for a rotary printing machine - Google Patents

Description

The invention relates to a painting device for a rotary printing machine, in particular a sheet-fed printing machine, according to the preamble of claim 1 and 2.

[State of the art]

A painting device of this kind is made DE 197 29 977 A1 known as an offset printing unit for coating substrates in a rotary printing press. In this painting device, the plate cylinder optionally has a planographic print form with an elastic surface or a flexible high-pressure mold. The plate cylinder is associated with a metering system which in the region of the bearings of the dampening roller has a screened applicator roll interchangeable (against the dampening roller) arranged, wherein the applicator roller is associated with a chamber doctor blade. When painting, the inking unit with its inking rollers is separated from the plate cylinder. It is advantageous if the fixable on the plate cylinder printing plate is fed and removed by means of an automated Plattenspann- and changing device.

Another painting device for a rotary printing press is off EP 0 620 115 A1 known. For InLine coating of printing materials are provided at least two painting units. The upstream in the conveying direction of the printing material first painting unit is as a flexographic printing unit with a flexible high-pressure mold-carrying cylinder, which is in contact with the printing material leading printing cylinder, a screened applicator roller, which in turn is in contact with the forme cylinder and formed an engageable chamber doctor blade. The downstream second painting unit is designed as a conventional painting unit and can be used especially for full-surface painting.
In printing presses, flexible blankets are stretched on the forme cylinder for full-surface painting. Such blankets have an improved damping function and are less expensive than paint plates and correspond to the rubber blankets used on blanket cylinders of offset printing.

Out DE 196 13 119 A1 For a coating tower of a sheet-fed rotary printing machine with a sheet guiding cylinder, a coating cylinder with an applicator unit is known, the coating cylinder being designed as a printing plate cylinder arranged in printing units of sheetfed offset printing presses with a plate tension. In addition, the painting cylinder is assigned a plate changing device for the paint plates.

When using rubber blankets in rotary printing presses, it is disadvantageous that the tension of a blanket is very expensive and thus high set-up times are required. Furthermore, it is disadvantageous when using paint plates that they have too little damping properties and the paint plates are more expensive than blankets.

OBJECT OF THE INVENTION

The invention has for its object to provide a painting device of the type described above, which has a setup time shortening enabling design for exciting, plate-shaped printing plates and is universally applicable.

The object is solved by the training features of claim 1 and 2. Further developments emerge from the dependent claims.

A first advantage of the painting device is due to the fact that this device is suitable for the processing of different types of coatings, such as printing varnish, aqueous dispersion varnish, UV varnish, blister varnish, or special colors such as metal inks, flexographic inks.

A further advantage is that the coating device can be used in an offset printing unit and / or in a coating unit. In this case, this device is operable in an offset printing unit in indirect pressure and in a coating unit in direct pressure.

The offset printing unit consists in indirect pressure in a conventional manner, at least from a printing cylinder leading the printing material, a blanket cylinder and a plate cylinder, wherein the plate cylinder is assigned at least one inking unit. This training is suitable for waterless or fountain solution-free offset printing (dry offset). For wet offset printing, a dampening unit is arranged upstream of the inking unit in the direction of rotation of the plate cylinder.

The coating unit consists in direct printing at least one of the printing material leading impression cylinder, a forme cylinder and a dosing system with at least one applicator roller.

In this case, a laminate is fixed in an offset printing unit in the indirect pressure on the plate cylinder (in the case of a downstream blanket cylinder) and in a coating unit, the laminate is fixed on the forme cylinder in direct pressure.

It is also advantageous that the plate cylinders in offset printing and / or the forme cylinders in coating units each assigned a plate changing device, so that a change of the laminated body in each printing / coating unit is automatically realized.

A further advantage consists in that the layered body consists of a bendable carrier layer, a compressible layer arranged on the carrier layer, preferably a rubber layer, and a blanket cover layer arranged on the layer. The composite has planar, interconnected layers in the clamped state; adapted to the cylinder, are curved.

A laminate has (compared to paint plates) an improved damping behavior, for example in the case of a channel impact, and can be used universally for a full-area or a recessed coating (spot painting). In the recessed coating it is advantageous that at least the blanket cover layer of the composite body is strippable (partial removal of the blanket cover layer for the recessed lacquering).

A further advantage is that the plate clamping devices are formed uniformly in plate cylinders and forme cylinders and are preferably adjustable to a uniform thickness of the pressure plates to be clamped, ie the Thickness of the carrier layer of the laminated body corresponds to the thickness of an offset printing plate.

[Examples]

Fig. 1

eine Druckmaschine mit Offsetdruckwerken und Lackwerken,

Fig. 2

eine Lackiervorrichtung für ein Offsetdruckwerk,

Fig. 3

eine Lackiervorrichtung für ein Lackwerk,

Fig. 4

einen Schichtkörper im Aufbau.

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

Fig. 1

a printing press with offset printing units and coating units,

Fig. 2

a painting device for an offset printing unit,

Fig. 3

a painting device for a coating unit,

Fig. 4

a layered body under construction.

A rotary printing machine, such as a sheet-fed press, with multiple offset printing units 1 is formed in a row construction, wherein in the conveying direction of the sheet-shaped substrate a first coating unit 2 and second coating unit 3 is arranged downstream of the offset printing units 1. Between the coating units 2, 3, a drying system 4 is arranged to dry the substrates to be processed. The second coating unit 3 is followed by a boom 5, which is formed, inter alia, by the circulating conveyor systems 7, which transport the sheet-shaped substrate to a delivery pile 6 and store.

An offset printing unit 1 consists essentially of a plate cylinder 8, a blanket cylinder 9 and a sheet guiding cylinder a printing cylinder 11. The plate cylinder 8 is an inking unit 15 with a roller train and inking rollers 16 assigned, if necessary, a dampening unit is still adjacent to the plate cylinder 8, which will not be discussed further here. Between the printing units 1, the coating units 2, 3 and the dryer system 4, a transfer cylinder 10 for the transport of the substrates are arranged in each case.

The coating unit 2 consists of a printing cylinder 11, a printing cylinder 11 with the pressure nip (painting) forming cylinder 12, which carries a laminated body 17, and a first metering 13. The first metering 13 is in the present example by a with the forme cylinder 12 in Contact brought, rasterized applicator roll and formed with this applicator roller operatively connected chamber doctor blade. Alternatively, dosing systems can also be used as two-roll mills with a paint supply (squeeze roll principle) feeding from above into the common nip, or with a scoop roll (scoop / dipping roll principle) dipping into a storage container.

The second coating unit 3 consists of the printing cylinder 11, a form this with the printing nip (painting) forming cylinder 12 having a laminated body 17 and a second metering system 14. The second metering system 14 is formed, for example, by an applicator roller and a metering roller as a two-roller mill (squeeze roller principle).
Alternatively, here also chamber doctor blade systems with rastered applicator roll or roll plants according to the scoop / dipping roll principle can be used.

The metering systems 13, 14 can each be coupled with a separately controllable circuit for the circulation of coating liquids.

The painting device for an offset printing unit of a rotary printing press has circumferentially on the plate cylinder 1 for fixing the laminated body 17 plate clamping devices 24. The layered body 17 is bendable and consists of a carrier layer 18 which can be fixed in the plate clamping devices 24 of the plate cylinder 8. A compressible layer 19, preferably a rubber layer, is arranged fixedly on the carrier layer 18. On top of this compressible layer 19, a fixed rubber blanket cover 20 is arranged. In this case, the blanket cover layer 20 with the adjacent blanket cylinder 9 of the offset printing unit 1 in functional connection.

The painting device for a coating unit 2 and / or 3 of a rotary printing press has circumferentially on the forme cylinder 12 for fixing the laminated body 17 plate clamping devices 24. This layered body 17 is bendable and analogous to the layered body 17 in the offset printing unit 1 with support layer 18, compressible layer 19, preferably rubber layer, and blanket cover layer 20 constructed. The carrier layer 18 is fastened in the plate clamping devices 24 of the forme cylinder 12 and the blanket cover layer 20 is in functional connection with the adjacent printing cylinder 11 carrying the printing material.

The carrier layer 18 is preferably a metallic material or at least the carrier layer 18 contains a metallic material. Such metallic materials are in particular steel or aluminum. Alternatively, plastic materials can be used as carrier layer 18. The layered body 17 is bendable and especially the carrier layer 18 is dimensionally stable.

The compressible layer 19 has to increase the damping function prefers air pockets and / or closed air channels.
Preferably, the laminated body 17 is strippable at least on the blanket cover layer 20. Thus, the layered body 17 can also be used for the recessed lacquering (spot lacquering). In the stripped area of the blanket cover layer 20, the underlying compressible layer 19 is recessed to the plane of the blanket cover layer 20 and is thus not a lacquer carrier.
Preferably, the compressible layer 19 is vulcanized onto the carrier layer 18. The compressible layer 19 and the blanket cover layer 20 are adherent, preferably by means of adhesive bonding, connected. The layers 18,19 and 20 are made flat and are adapted to the cylinder 8,12, curved in the installed position. All layers 18-20 are adhesively bonded together.

The operation of the paint device is as follows: In an offset printing unit 1, a laminated body 17 is preferably supplied to the plate cylinder 8 by means of a known plate changing device 23. Since the layered body 17 is bendable, but stiffer than a rubber blanket on the part of the elasticity, the supply or removal preferably by means of this plate changing device 23 can be realized in a stable production.

If previously a printing plate was fixed on the plate cylinder 8, this is previously fed back from the plate cylinder 8 in the plate changing device 23. The laminated body 17 is fixed to the carrier layer 18 at the end by the plate chucks 24 on the plate cylinder 8.

In this embodiment, the processing is in offset printing 1 from, for example, printing varnish from the ink fountain via the compactor, when the inking rollers 18 are employed. Alternatively, with parked inking rollers 18, a separate metering system 21 with at least one applicator roller 22 can be used, as is made DE 197 29 977 A1 is known. This training is particularly suitable for aqueous dispersion coatings. In this case, the dosing system 21 is not limited to a chambered doctor blade system with screened application roller (applicator roller 21). Rather, alternatively, roller mills can be used according to the squeeze roller principle or the scoop / dipping roller principle. If a dampening unit is available, a paint feed via the dampening unit can also be realized.

In an offset printing unit 1, a laminated body 17 is preferably fed to the plate cylinder 8 by means of a plate changing device 23 known per se. Since the layered body 17 is bendable, but stiffer on the part of the elasticity than a rubber blanket known per se, the supply or removal preferably by means of this plate changing device 23 can be realized in a stable production.

If previously a printing plate was fixed on the plate cylinder 8, this is previously fed back from the plate cylinder 8 in the plate changing device 23. The laminated body 17 is fixed to the carrier layer 18 at the end by the plate chucks 24 on the plate cylinder 8. In a preferred embodiment, such a support layer 18, at least in the region of the pressure head rail of a plate clamping device 24 punches for a per se known register system.

In the offset printing unit 1, the processing of, for example, printing ink from the ink fountain on the compactor, in employed inking rollers 18, realized. Alternatively is parked at Ink application rollers 18 a separate metering 21 with at least one applicator roll 22 can be used, as is made DE 197 29 977 A1 is known. This training is particularly suitable for aqueous dispersion coatings. In this case, the dosing system 21 is not limited to a chambered doctor blade system with screened application roller (applicator roller 21). Rather, alternatively, roller mills can be used according to the squeeze roller principle or the scoop / dipping roller principle. If a dampening unit is available, a paint feed via the dampening unit can also be realized.

In an advantageous embodiment, the fixed on the plate cylinder 8 laminated body 17 by means of a rubber blanket cylinder 9 adjacent washing device 25 can be cleaned. For this purpose, the laminated body 17 on the plate cylinder 8 and the blanket on the blanket cylinder 9 in contact. By means of washing device 25 and blanket cylinder 9, the laminated body 17 is cleaned together.
Alternatively, a washing device 25 is assigned to the contact region of plate cylinder 8 and blanket cylinder 9. In this embodiment, the washing device 25 can be adjusted jointly to both cylinders 8, 9 so that the cylinders 8, 9 can be cleaned simultaneously. In Fig. 2 Both arrangements of washing devices 25 are shown together.

In a coating unit 2, 3 is preferably supplied by means of a per se known plate changing device 23 depending on a layered body 17 to the respective forme cylinder 12. Since the layered body 17 is bendable, but stiffer on the part of the elasticity than a rubber blanket known per se, the supply or removal preferably by means of this plate changing device 23 can be realized in a stable production.

If previously a paint plate, such as a flexible High-pressure plate, was fixed on the form cylinder 12, this is previously conveyed back from the forme cylinder 12 in the plate changing device 23. The layered body 17 is fixed to the carrier layer 18 at the end by the plate clamping devices 24 on the forme cylinder 12. In a preferred embodiment, such a support layer 18, at least in the region of the pressure head rail of a plate clamping device 24 punches for a per se known register system.

In the coating unit 2, 3, for example, the processing of aqueous dispersion coatings can be realized. As metering systems chamber doctor blade systems with rastered applicator rollers and, alternatively, roller systems based on the squeeze roller principle or the scoop / dipping roller principle can be used.

In an advantageous embodiment, the layered body 17 fixed on the forme cylinder 12 can be cleaned by means of a washing device 25 adjacent to the forme cylinder 12.

[REFERENCE LIST]

1

Offset printing

2

coating unit

3

coating unit

4

dryer system

5

boom

6

delivery pile

7

conveyor system

8th

plate cylinder

9

Blanket cylinder

10

transfer cylinder

11

pressure cylinder

12

form cylinder

13

dosing

14

dosing

15

inking

16

Inking roller

17

layer body

18

backing

19

compressible rubber layer

20

Blanket cover layer

21

dosing

22

applicator roll

23

Plate changing device

24

Plate clamping device

25

washer

Claims (9)

1. A coating device for a rotary printing machine with a printing cylinder (11), a rubber blanket cylinder (9), and a plate cylinder (8) with at least one associated inking system, wherein the ink application rolls of the inking system can be set to and off the plate cylinder, characterized in that on the circumferential side on the plate cylinder (8) plate clamping devices (24) are arranged by means of which a flexible layer body (17) is fixed on the plate cylinder (8) which comprises a carrier layer (18) that can be fixed on the end side in the plate clamping devices (24), and that the layer body (17) comprises at least one fixed compressible layer (19) arranged based on the carrier layer (18) and a fixed rubber blanket covering layer (20) arranged based on this layer (19), wherein the rubber blanket covering layer (20) is operationally connected with the neighbouring rubber blanket cylinder (9).
2. The coating device for a rotary printing machine with a printing cylinder (11), a form cylinder (12), and a dosing system with at least one application roll associated with the form cylinder, characterized in that on the circumferential side on the form cylinder (12) plate clamping devices (24) are arranged by means of which a flexible layer body (17) is fixed on the form cylinder (12) which comprises a carrier layer (18) that can be fixed on the end side in the plate clamping devices (24), and that the layer body (17) comprises at least one fixed compressible layer (19) arranged based on the carrier layer (18) and a fixed rubber blanket covering layer (20) arranged based on this layer (19), wherein the rubber blanket covering layer (20) is operationally connected with the neighbouring printing cylinder (13) conducting a print material.
3. The coating device according to Claim 1 or 2, characterized in that the carrier layer (18) is a metal material or contains at least one metal material.
4. The coating device according to Claim 3, characterized in that the metal material of the carrier layer (18) is an aluminium material.
5. The coating device according to at least Claim 1 or 2, characterized in that the compressible layer (19) is a rubber layer and comprises air inclusions or air ducts.
6. The coating device according to at least Claim 1 or 2, characterized in that at least the rubber blanket covering layer (20) can be stripped.
7. The coating device according to at least Claim 1 and 2, characterized in that the compressible rubber layer (19) is vulcanised onto the carrier layer (18).
8. The coating device according to Claim 1, characterized in that a plate changing device (23) is adjacently associated with the plate cylinder (8).
9. The coating device according to Claim 2, characterized in that a plate changing device (23) is adjacently associated with the form cylinder (12).

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