DE20102450U1 - Painting device for a rotary printing machine - Google Patents

Description

[Utility model application]

MAN Roland Printing Machines AG Mühlheimer Strasse 341
63075 Offenbach
5

[Title of the invention] Coating device for a rotary printing machine

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[Description]

The invention relates to a varnishing device for a rotary printing press, in particular a sheet-fed printing press, according to the preamble of claim 1, 2, 3 or 4. 5

[State of the art]

A varnishing device of this type is known from DE 197 2 9 977 A1 as an offset printing unit for varnishing printing materials in a rotary printing machine. In this varnishing device, the plate cylinder carries either a planographic printing form with an elastic surface or a flexible letterpress form. A dosing system is assigned to the plate cylinder, which has a screened form roller arranged in the area of the bearings of the dampening form roller that can be exchanged (for the dampening form roller), with a chamber doctor blade assigned to the form roller. During varnishing, the inking unit with its ink form rollers is separated from the plate cylinder. It is advantageous if the printing form that can be fixed on the plate cylinder is fed and removed by means of an automated plate clamping and changing device.

Another coating device for a rotary printing machine is known from EP 0 620 115 A1. At least two coating units are provided for in-line coating of printing materials. The first coating unit, which is arranged upstream in the conveying direction of the printing material, is designed as a flexible printing unit with a forme cylinder carrying a flexible letterpress form, which is in contact with a printing cylinder guiding the printing material, a screened application roller, which in turn is in contact with the forme cylinder, and an adjustable chamber doctor blade. The second coating unit arranged downstream is designed as a conventional coating unit and can be used specifically for full-surface coating.

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In the printing industry, flexible rubber blankets are stretched over the forme cylinder for full-surface varnishing. Such rubber blankets have an improved damping function and are less expensive than varnish plates and correspond to the rubber blankets used on blanket cylinders of offset printing units.

From DE 196 13 119 A1, a coating cylinder with an application unit is known for a coating tower of a sheet-fed rotary printing press with a sheet guide cylinder, wherein the coating cylinder is designed as a printing form cylinder with a plate tension arranged in printing units of sheet-fed offset printing presses. In addition, a plate changing device for the coating plates is assigned to the coating cylinder.

The disadvantage of using rubber blankets in rotary printing machines is that tensioning a rubber blanket is very complex and therefore requires long set-up times. Another disadvantage of using coating plates is that they do not have enough dampening properties and the coating plates are more expensive than rubber blankets.

[Task of the invention]

The invention is based on the object of creating a painting device of the type described above, which in particular has a structure which enables a reduction in set-up time and is universally applicable.

0 The problem is solved by the training features of claim 1, 2, 3 or 4. Further developments arise from the dependent claims.

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A first advantage of the coating device is that this device is suitable for processing different types of varnish, such as printing varnish, aqueous dispersion varnish, UV varnish, blister varnish, or even special inks such as metallic printing inks or flexographic printing inks.

It is also advantageous that the varnishing device can be used in an offset printing unit and/or in a varnishing unit. This device can be operated in an offset printing unit in indirect printing and in a varnishing unit in direct printing.

In indirect printing, the offset printing unit consists, in a manner known per se, of at least one printing cylinder that guides the printing material, a blanket cylinder and a plate cylinder, with at least one inking unit being assigned to the plate cylinder. This design is suitable for waterless or dampening 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.

In direct printing, the coating unit consists of at least one printing cylinder that guides the printing material, a forme cylinder and a dosing system with at least one application roller.

In an offset printing unit, a layered body is fixed to the plate cylinder in indirect printing (with a downstream blanket cylinder) and in a varnishing unit, the layered body is fixed to the forme cylinder in direct printing.

It is also advantageous that the plate cylinders in offset printing units and/or the forme cylinders in coating units are each assigned a plate changing device, so that a change

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the laminated body can be realized automatically in every printing/coating unit.

A further advantage is that the laminated body in its first embodiment consists of a flexible carrier layer, a compressible layer, preferably a rubber layer, firmly attached to the carrier layer, and a rubber blanket covering layer firmly attached to the layer. The laminated body has flat, interconnected layers which, when stretched out, are curved to fit the cylinder.

In an advantageous second embodiment, the laminated body consists of a flexible carrier layer - similar to the first embodiment - and only one rubber layer firmly attached to the carrier layer, which simultaneously forms the rubber blanket cover layer. This rubber layer can be designed to be compressible or non-compressible.
It is known that compressible rubber layers have a relative compressibility of > 4.5%, whereas incompressible rubber layers have a relative compressibility of < 4.5%.

A laminated body in the first or second embodiment has (compared to lacquered plates) improved damping properties, for example in the case of a channel impact, and can be used universally for full-surface or recessed lacquering (spot lacquering). In recessed lacquering, it is advantageous that in the first embodiment at least the rubber blanket covering layer of the laminated body can be stripped (partial removal of the rubber blanket covering layer for recessed lacquering). Preferably, in the second embodiment, the rubber layer can be stripped. The stripping of the rubber blanket covering layer and/or rubber layer is preferably carried out using a cutting machine.

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tool. Alternatively, a laser tool can also be used to strip the rubber blanket cover layer or rubber layer.

Another advantage is that the plate clamping devices
are uniformly designed for both plate cylinders and forme cylinders and are preferably adjustable to a uniform thickness of the printing forms to be clamped, ie the thickness of the carrier layer of a laminated body corresponds to the thickness of an offset printing plate. This has the advantage that

all printing and coating units can be operated with uniformly adjustable clamping devices.

[Examples]

The invention will be explained in more detail using an embodiment example. The following diagrammatically shows:

Fig. 1 a printing press with offset printing units

and paint works,
20

Fig. 2 a varnishing device for an offset

printing unit,

Fig. 3 a painting device for a painting plant,

Fig. 4 a first layered body in construction,

Fig. 5 a second layered body in construction.

A rotary printing press, for example a sheet-fed printing press, with several offset printing units 1 is designed in a series construction, with a first varnishing unit 2 and a second varnishing unit 3 in the conveying direction of the sheet-shaped printing materials

arranged _downstream of the offset printing units 1. Between the varnish-2 0 6*2*0 K 0*3 -neiij'djocj / ;3*§4*Q?D igtftic?. \ £)9 iO2 .Oil 08 :17 : 37

A dryer system 4 is arranged between the two coating units 2, 3 to dry the printing materials to be processed. A delivery unit 5 is arranged downstream of the second coating unit 3, which is formed, among other things, by the circulating conveyor systems 7, which transport and deposit the sheet-shaped printing material on a delivery stack 6.

An offset printing unit 1 essentially consists of a plate cylinder 8, a blanket cylinder 9 and a printing cylinder 11 as a sheet guide cylinder. An inking unit 15 with a roller train and ink application rollers 16 is assigned to the plate cylinder 8; a dampening unit may also be adjacent to the plate cylinder 8, which will not be discussed further here. A transfer cylinder 10 for transporting the printing materials is arranged between the printing units 1, the coating units 2, 3 and the dryer system 4.

The coating unit 2 consists of a printing cylinder 11, a forme cylinder 12 which forms the printing gap (coating gap) with the printing cylinder 11 and which carries a layered body 17 (as a coating form), and a first dosing system 13. In the present example, the first dosing system 13 is formed by a screened application roller which can be brought into contact with the forme cylinder 12 and a chamber doctor blade which is functionally connected to this application roller. Alternatively, dosing systems can also be used as two-roller units with a paint supply fed into the common roller gap from above (squeeze roller principle) or roller units with a scoop roller which dips into a storage container (scoop/dip roller principle).

The second varnishing unit 3 consists of the printing cylinder 11, a forme cylinder 12 forming the printing gap (varnishing gap) with it, the ^a^ layer body .17.,(a],s varnish form) and a

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second dosing system 14. The second dosing system 14 is designed, for example, by an application roller and a dosing roller as a two-roller system (squeeze roller principle). Alternatively, chamber doctor blade systems with a screened application roller or roller systems based on the scoop/dip roller principle can also be used here.

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

The varnishing device for an offset printing unit of a rotary printing press has plate clamping devices 24 arranged on the circumference of the plate cylinder 1 for fixing the layer body 17. The layer body 17 is flexible and consists of a carrier layer 18 that can be fixed in the plate clamping devices 24 of the plate cylinder 8.

In the first embodiment, at least one compressible layer 19, preferably a rubber layer, is fixedly arranged on the carrier layer 18. A fixed rubber blanket cover layer 20 is arranged on this compressible layer 19. The rubber blanket cover layer 20 is in functional connection with the adjacent rubber blanket cylinder 9 of the offset printing unit 1. The compressible layer 19 according to the first embodiment preferably has air inclusions and/or closed air channels to increase the damping function. In the second embodiment, a rubber layer 26 is fixedly arranged on the carrier layer 18 and is in functional connection with the adjacent rubber blanket cylinder 9.

The coating device for a coating unit 2 and/or 3 of a rotary printing machine has plate clamping devices 24 on the circumference of the forme cylinder for fixing the layer body 17. This layer body 17 ^is^ bendable. and analogous to the

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Layered body 17 in the offset printing unit 1 in the first embodiment is constructed with a carrier layer 18, at least one compressible layer 19, preferably a rubber layer, and a rubber blanket cover layer 20. The rubber blanket cover layer 20 is in functional connection with the adjacent printing cylinder 13 which guides a printing material.

Alternatively, in a second embodiment, a rubber layer 26 is arranged fixedly on the carrier layer 18, which is in functional connection with the adjacent printing cylinder 13 guiding a printing material.

The carrier layer 18 is thereby (in the first and second embodiments) fastened in the plate clamping devices 24 of the forme cylinder 12 and the rubber blanket covering layer 20 of the first embodiment as well as the rubber layer 26 of the second embodiment are each in functional connection with the adjacent printing cylinder 11 which guides 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 the carrier layer 18. Alternatively, the carrier layer 18 of each layer body 17 is formed by a layer 5 of a metallic material, preferably steel or aluminum, and a further layer of a plastic material. The carrier layer 18 is thus a layered composite of a metallic and a plastic material. These layers forming the carrier layer 18 are firmly bonded to one another layer by layer. The layer body 17 is flexible and the carrier layer 18 in particular is dimensionally stable.

Preferably, the layered body 17 is covered at least on the rubber layer 2^0 ( _first formation of the rubber layer

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26 (second embodiment) can be stripped. This means that the laminated body 17 can also be used for recessed painting (spot painting).

In the stripped area of the rubber blanket covering layer 20 after the first formation, the compressible layer 19 underneath is recessed to the level of the rubber blanket covering layer 20 and is therefore not a paint carrier. The compressible layer 19 is preferably vulcanized onto the carrier layer 18. The compressible layer 19 and the rubber blanket covering layer 20 are firmly bonded, preferably by means of an adhesive bond. The layers 18, 19 and 20 are flat and are curved in the installation position to match the cylinder 8, 12. All layers 18 - 20 are firmly bonded to one another by vulcanization and/or adhesive bonding.

In the stripped area of the rubber layer 26 after the second embodiment, the underlying carrier layer 18 is recessed to the level of the rubber layer 26 and is not a paint carrier. The rubber layer 26 is preferably vulcanized onto the carrier layer 18. Alternatively, the rubber layer 26 is firmly bonded to the carrier layer 18, preferably by means of an adhesive bond. The rubber layer 26 is designed to be flat with the carrier layer 18 and is curved in the installed position to fit the cylinder 8, 12.

The stripping of the rubber blanket cover layer 20 (first embodiment) or the rubber layer 26 (second embodiment) can preferably be carried out using a cutting tool or a laser tool. Rubber blanket cover layers 20 or rubber layers 26 stripped in this way are suitable for transferring the subject matter to the printing material with sharp edges and thus contribute to increasing the quality.

The mode of operation of the paintwork is as follows: In a 2&thgr;[03<&iacgr;&Mgr;3 -h^'.'cjoq /· 3«8*4j5o \Sybe. ·/ '09: 02 *D1 08:17:37

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A laminated body 17 is preferably fed to the plate cylinder 8 in the offset printing unit 1 by means of a plate changing device 23 known per se. Since the laminated body 17 is flexible, but is more elastic than a rubber blanket, the feeding or removal can preferably be implemented in a production-stable manner by means of this plate changing device 23.

If a printing plate was previously fixed on the plate cylinder 8, it is first fed back from the plate cylinder 8 into the plate changing device 23. The layer body 17 is fixed at the end to the carrier layer 18 by the plate clamping devices 24 on the plate cylinder 8.

In this design, the processing of, for example, printing ink from the ink fountain via the roller train can be implemented in the offset printing unit 1 when the ink application rollers 18 are engaged. Alternatively, when the ink application rollers 18 are engaged, a separate dosing system 21 with at least one application roller 22 can be used, as is known from DE 197 29 977 A1. This design is particularly suitable for aqueous dispersion varnishes. The dosing system 21 is not limited to a chamber doctor blade system with a screened application roller (application roller

21). Alternatively, roller systems based on the squeeze roller principle or the scoop/dip roller principle can be used. If a dampening system is available, paint can also be supplied via the dampening system.

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 laminated body 17 is flexible, but is more elastic than a rubber blanket known per se, the feeding or removal is preferably carried out with the aid of the plate changing device 23. This is preferably done in the direction of the plate changing device 23. 200^0«7Jö3-ne.u'.i}dc ·/ 3850,0* ByEe*'?^ . (52,: Qi. 08:17:37

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can be implemented in a stable manner.

If a printing plate was previously fixed on the plate cylinder 8, it is first fed back from the plate cylinder 8 into the plate changing device 23. The laminated body 17 is fixed at the end exclusively to the carrier layer 18 by the plate clamping devices 24 on the plate cylinder 8. In a preferred embodiment, such a carrier layer 18 has, at least in the area of the printing start rail of a plate clamping device 24, punchings for a register system known per se.

In the offset printing unit 1, the processing of, for example, printing varnish from the ink fountain via the roller train can be implemented with the ink form rollers 18 engaged. Alternatively, with the ink form rollers 18 disengaged, a separate metering system 21 with at least one form roller 22 can be used, as is known from DE 197 29 977 A1. This design is particularly suitable for aqueous dispersion varnishes. The metering system 21 is not limited to a chamber doctor blade system with a screened form roller (form roller 21). Instead, roller units based on the squeeze roller principle or the scoop/dip roller principle can be used as an alternative. If a dampening unit is present, varnish can also be supplied via the dampening unit.

In an advantageous embodiment, the laminated body 17 fixed on the plate cylinder 8 can be cleaned by means of a washing device 25 adjacent to the blanket cylinder 9. For this purpose, the laminated body 17 on the plate cylinder 8 and the blanket on the blanket cylinder 9 are in contact. The laminated body 17 is cleaned together by means of the washing device 25 and the blanket cylinder 9. Alternatively, a washing device _{25 is assigned to the contact area of the plate cylinder 8 and} the blanket cylinder 9. The 2&thgr;&phgr;&Ogr;·&iacgr;&sgr;3-&eegr;&bgr;,*&iacgr;.|&agr;&phgr;&thgr;^# :/ ·38·40^ b%te\:fi _t 09 . 02:. qJl 08:17:37

In this embodiment, the washing device 25 can be placed jointly on 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. 5

In a coating unit 2, 3, a layered body 17 is preferably fed to the respective forme cylinder 12 by means of a plate changing device 23 known per se. Since the layered body 17 is flexible, but is more elastically rigid than a rubber blanket known per se, the feeding or removal can preferably be carried out in a production-stable manner by means of this plate changing device 23.

If a lacquer plate, for example a flexible letterpress plate, was previously fixed to the forme cylinder 12, it is first fed back from the forme cylinder 12 into the plate changing device 23. The laminated body 17 is fixed at the end exclusively with the carrier layer 18 to the forme cylinder 12 by the plate clamping devices 24. 0 In a preferred embodiment, such a carrier layer 18 has, at least in the area of the initial printing rail of a plate clamping device 24, punchings for a register system known per se.

In coating units 2 and 3, for example, the processing of aqueous dispersion coatings is possible. Chamber doctor blade systems with screened application rollers and, alternatively, roller units based on the squeeze roller principle or the scoop/dip roller principle can be used as dosing systems.

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.

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[List of reference symbols]

1 Offset printing unit 2 Coating unit

3 Coating unit

4 Dryer system

5 booms

6 Boom stack 7 Conveyor system

8 plate cylinders

9 blanket cylinders

10 transfer cylinders

11 printing cylinders 12 forme cylinders

13 Dosing system

14 Dosing system

15 inking units

16 Ink roller 17 Laminated body

18 Carrier layer

19 compressible rubber layer

20 Rubber blanket cover layer

21 Dosing system 22 Application roller

23 Plate changing device

24 Plate clamping device

25 Washing device

2 6 Rubber layer 30

08:17:37

Claims (15)

1. Varnishing device for a rotary printing machine with a printing cylinder, a rubber blanket cylinder and a plate cylinder with at least one associated inking unit, wherein the inking rollers of the inking unit can be turned on and off relative to the plate cylinder, characterized in that plate clamping devices ( 24 ) are arranged on the circumference of the plate cylinder ( 1 ) for fixing a laminated body ( 17 ) and that this laminated body ( 17 ) is bendable and has a carrier layer ( 18 ) that can be fixed in the plate clamping devices ( 24 ) and at least one fixed compressible layer ( 19 ) arranged on the carrier layer ( 18 ) and a fixed rubber blanket cover layer ( 20 ) arranged on this layer ( 19 ), wherein the rubber blanket cover layer ( 20 ) is functionally connected to the adjacent rubber blanket cylinder ( 9 ). 2. Coating device for a rotary printing machine with a printing cylinder, a forme cylinder and a dosing system with at least one applicator roller assigned to the forme cylinder, characterized in that plate clamping devices ( 24 ) are arranged on the circumference of the forme cylinder ( 12 ) for fixing a layered body ( 17 ) and that this layered body ( 17 ) is bendable and a carrier layer ( 18 ) fixable in the plate clamping devices ( 24 ) and at least one fixed compressible layer ( 19) arranged on the carrier layer (18 ) and a fixed blanket cover layer ( 20 ) arranged on this layer ( 19 ) are in functional connection with the adjacent printing cylinder ( 13 ) guiding a printing material. 3. Varnishing device for a rotary printing machine with a printing cylinder, a rubber blanket cylinder and a plate cylinder with at least one associated inking unit, wherein the inking rollers of the inking unit can be switched on and off relative to the plate cylinder, characterized in that plate clamping devices ( 24 ) are arranged on the circumference of the plate cylinder ( 1 ) for fixing a layered body ( 17 ) and that this layered body ( 17 ) is bendable and has a carrier layer ( 18 ) which can be fixed in the plate clamping devices ( 24 ) and a fixed rubber layer ( 26 ) arranged on the carrier layer ( 18 ), wherein the rubber layer ( 26 ) is in functional connection with the adjacent rubber blanket cylinder ( 9 ). 4. Coating device for a rotary printing machine with a printing cylinder, a forme cylinder and a dosing system with at least one applicator roller assigned to the forme cylinder, characterized in that plate clamping devices ( 24 ) are arranged on the circumference of the forme cylinder ( 12 ) for fixing a layered body ( 17 ) and that this layered body ( 17 ) is bendable and has a carrier layer ( 18 ) fixable in the plate clamping devices ( 24 ) and a fixed rubber layer ( 26 ) arranged on the carrier layer ( 18 ), the rubber layer ( 26 ) being in functional connection with the adjacent printing cylinder ( 13 ) guiding a printing material. 5. Painting device according to one of claims 1 to 4, characterized in that the carrier layer ( 18 ) is a metallic material or at least contains a metallic material. 6. Painting device according to one of claims 1 to 4, characterized in that the carrier layer ( 18 ) is a layer composite of a metallic material and a plastic material. 7. Painting device according to claim 5 or 6, characterized in that the metallic material of the carrier layer ( 18 ) is a steel or aluminum material. 8. Painting device according to at least claim 1 or 2, characterized in that the compressible layer ( 19 ) is a rubber layer and has air inclusions or air channels. 9. Painting device according to claim 1 or 2, characterized in that at least the rubber blanket cover layer ( 20 ) is strippable. 10. Painting device according to claim 3 or 4, characterized in that the rubber layer ( 26 ) is strippable. 11. Painting device according to at least claims 1 and 2, characterized in that the compressible rubber layer ( 19 ) is vulcanized onto the carrier layer ( 18 ). 12. Coating device according to claim 1 or 3, characterized in that a plate changing device ( 23 ) is assigned adjacent to the plate cylinder ( 8 ). 13. Painting device according to claim 2 or 4, characterized in that a plate changing device ( 23 ) is assigned adjacent to the forme cylinder ( 12 ). 14. Painting device according to claim 3 or 4, characterized in that the rubber layer ( 26 ) is compressible. 15. Painting device according to claim 3 or 4, characterized in that the rubber layer ( 26 ) is not compressible.