EP2216174B1 - Method and device for coating and embossing a printed item in a printing machine - Google Patents

Description

The invention relates to a method and a device for coating and embossing a printing substrate in a processing machine according to the preambles of the independent claims 1, 2 and 11.

A procedure and a device of this kind are made DE 198 26 974 A1 known, which allow the production of embossed structures on a sheet or web-shaped substrate in the inline process of a printing press. Starting from at least one color print applied to the printing substrate, the printing substrate is then painted, in particular by means of an aqueous dispersion paint. After varnishing, the varnish layer present on the printing substrate is dried during the transport of the printing substrate and subsequently embossed in the printing ink layer and the varnish layer bearing substrate.

The device after DE 198 26 974 A1 comprises a first coating unit, which is arranged downstream of the printing units, and a finishing unit downstream of the first coating unit, which can be a second coating unit. Between the first coating unit and the finishing station, a dryer is preferably arranged to ensure that the printed and varnished surface of the sheet is dried before the mechanical processing (embossing) in the finishing station. The finishing station includes a stampable on a first cylinder, such as a forme cylinder, embossing plate. The embossing plate operates against a two-layer elastic embossing pad, which cooperates with a co-operating with the first cylinder second cylinder, for example a
Impression cylinder, can be clamped. The coating material used is in particular water-based dispersion varnish.

From the DE 10 2008 031 500 A1 is a single-sheet printing machine known. The printing press has an apparatus for molding a film engraving on a film web in a paint surface. The engraved foil is used by placing the foil engraving under the action of a dryer against a wet lacquer layer. In this case, a device for guiding the film with unwinding and winding is provided, wherein the film is exactly to lead. Furthermore, a drying device is provided in the region of the film system on the lacquer layer.

From the DE 10 2006 021 069 A1 is a printing press with holographic finishing unit known. The unit also has an apparatus for molding a film engraving on a film web in a paint surface. The engraved foil is used by placing the foil engraving under the action of a dryer against a wet lacquer layer. The engraved foil is used as an endlessly circulating element of limited length. For this purpose, a supply roll is provided in order to use new pieces of film can. This must be done with high accuracy, so that the impression of the foil engraving takes place exactly. Furthermore, a drying device is provided in the region of the film system on the lacquer layer.

Out EP 2 006 093 A2 is a sheet-fed press with a film transfer, in the direction of these downstream printing units and arranged in the direction of the printing units embossing known. After the film transfer and the printing units still a Lackbeschichtungswerk and a dryer are arranged. Thus, after a film transfer and the printing, a paint coating with subsequent drying applied to the sheet, which can then be provided with a surface embossing. The drying can be effected by ultraviolet light.

The object of the invention is to provide a method and a device of the type mentioned, wherein in an inline process, at least formed by the steps coating and embossing, the substrate to be processed receives an appreciation or a refinement.

The object is solved by the training features of independent claims 1, 2 and 11.

Further developments emerge from the dependent claims.

A first advantage is due to the fact that in a processing machine, the surface of a printing material, for example of sheet material, is coated in-line with a lacquer layer and then embossed into the printing material carrying the lacquer layer. In this case, an ultraviolet (UV) lacquer is coated on one side of the printing material (applied) for improved production of matt / gloss effects and to improve the feel of the printing material as a lacquer layer. The lacquer layer can be applied over the entire surface or partially on the substrate. Subsequently, in the on the surface of the printing material located, not yet polymerized, ie still relatively moist, coats lacquer layer and subsequently the embossed lacquer layer is polymerized. For polymerization, the embossed lacquer layer is temporarily exposed to ultraviolet (UV) radiation / drying, so that the lacquer layer provided with an embossing dries or hardens in a very short time. At the same time the embossed structure is fixed. By processing UV varnish - with reference to offset printing - preferably higher layer thicknesses can be applied to the substrate, so that improved matt / gloss effects can be achieved and in combination with the additional embossing, the substrate can be upgraded. It can preferably inline prior to coating of the printing substrate with lacquer, subsequent embossing and subsequent curing / drying of the printing material previously with a pressure, preferably a multi-color printing and / or at least one lacquer layer coated.

As a second advantage, it can be mentioned that the working method can be carried out in a processing machine with at least one printing unit and at least one coating unit or at least two coating units. In this case, a printing unit can also fulfill the function of a coating unit, as for example DE 197 29 985 A1 or DE 10 2005 010 207 A1 is known. Alternatively, the working method can be carried out in a processing machine with exclusively coating units, ie at least two coating units. In this case, the coating layer is applied to the substrate in a first coating unit and then is coined in the downstream, second coating unit. Subsequently, the lacquer layer (full or partial) is polymerized.

Advantageously, the processing machine is designed for processing sheet material and comprises sheet guiding cylinders for sheet transport. In this case, the sheet guiding cylinders with respect to a single-sized plate / plate cylinder may be formed in a single-size or a one-time, in particular double-size (½-round), (φ-round), etc., including their combinations within the processing machine. Likewise, the sheet guiding cylinders may have at least one lateral surface which, based on a theoretical cylinder diameter, is designed as a solid cylinder or preferably comprises lateral surfaces arranged within the theoretical cylinder diameter in the case of multiple-sized formation.
As a sheet material cardboard, foil or paper can be used. Such a processing machine can be operated in straight printing or perfecting.

Fig. 1

eine Verarbeitungsmaschine mit Druck-/Lackwerken und Bogenführungszylindern,

Fig. 2

eine Verarbeitungsmaschine mit Lackwerken und Bogenführungszylindern,

Fig. 3

eine Verarbeitungsmaschine mit Druck-/Lackwerken, Bogenführungszylindern und einer Prägevorrichtung,

Fig. 4

ein wahlweise als Lackwerk betreibbares Druckwerk.

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

Fig. 1

a processing machine with printing / coating units and sheet guiding cylinders,

Fig. 2

a processing machine with coating units and sheet guiding cylinders,

Fig. 3

a processing machine with printing / coating units, sheet guiding cylinders and an embossing device,

Fig. 4

an optionally operable as a coating unit printing unit.

A processing machine for sheet material, in Fig. 1 shown as a rotary printing press, includes several printing units A for the Perfecting or for the perfecting, shown here in a row (aggregate). The printing units A essentially comprise in each case a plate / forme cylinder 2 and a blanket cylinder 1, an inking unit 3 and, if required, a dampening unit 4. The blanket cylinder 1 is shown with a sheet guiding cylinder in the conveying direction 7 sheet guiding cylinder 5 with sheet holding means, here as a counter-pressure cylinder 5 , in active connection.

For the multi-color printing preferably a plurality of identical offset printing units A are arranged in a row, wherein between the sheet guiding cylinders 5 (impression cylinder 5) adjacent printing units A (if necessary: and / or Lackwerke B, C) further sheet guiding cylinder 6 arranged as a transfer cylinder 6 for sheet transport through the processing machine could be. The sheet guiding cylinders 6 may have at least one lateral surface, which - based on a theoretical cylinder diameter - is designed as a solid cylinder or, for example, in the case of multiple training within the theoretical Cylinder diameter arranged lateral surfaces include.

In the conveying direction 7 of the sheet material, the printing unit A or the printing units A, a first coating unit B is arranged downstream. This first coating unit B is followed by a second coating unit C in the conveying direction 7. The coating units B, C are preferably of identical construction and each comprise a plate / forme cylinder 2, to each of which a metering device 9 is assigned in operative connection. For example, the metering device 9 may comprise a chambered doctor blade with a screened application roller. Alternatively, roll mills (squeeze roller or scoop roller principle) can be used as metering device 9. Furthermore, such a coating unit B, C each comprise a counter-pressure cylinder 5 which is in operative connection with the plate / forme cylinder 2.

In the conveying direction 7 of the sheet material at least one printing / lacquer gap of a printing unit A (alternatively at least one coating unit B, C), a radiation / drying source 8, for example, in association with a small distance to the impression cylinder 5, be arranged downstream. The sheet material is fixed to the sheet guiding cylinder 5 to sheet holding means. The radiation / drying source 8 is directed in its effect on resting on the sheet guiding cylinder 5 sheet material. The radiation / drying sources 8 are preferably coupled in terms of circuitry and signaling with a machine control of the processing machine.

Between the two coating units B, C, a plurality of sheet guiding cylinders 5, 6 can be arranged for sheet transport. In this case, a transfer cylinder 6, a counter-pressure cylinder 5 may be adjacent, which is not part of a printing / coating unit A, B, C. Such a counter-pressure cylinder 5 may be arranged adjacent to a radiation / drying source 8 in association with a small distance. Alternatively, instead of the impression cylinder 5, a transfer cylinder 6 may be provided.
With respect to a single-sized plate / forme cylinder 2 are in the present Example, the sheet guiding cylinder (impression cylinder 5, transfer cylinder 6) double-sized. The bow guide cylinders 6 can each be associated with a known sheet guiding device 10, for example, with pneumatic support.

In the present example, the first coating unit B comprises a first gap 12, which is formed by a paint leading cylinder 2, shown here as plate / forme cylinder 2, with at least one metering device 9 and one, a substrate, here sheet material, leading impression cylinder 5. In this first gap 12, the surface of the printing material can be coated over its entire surface or partially with a lacquer layer. In the conveying direction 7 is followed by a downstream, second gap 13, formed by a cylinder 2 carrying a mold 11, shown here as a plate / forme cylinder 2, and a printing material leading impression cylinder 5 of a second coating unit C. In this gap 13 can in the paint layer be shaped.

The first gap 12 may be arranged in a first coating unit B or, depending on the machine configuration, alternatively in a printing unit A, which is suitable for coating a printing substrate with lacquer. Fig. 4 shows an example of DE 10 2005 010 207 A1 known printing unit A, which can be operated either as a coating unit B. Here, a separation is carried out at the contact point of plate / forme cylinder 1 and blanket cylinder 1. By means of the metering device 9 UV varnish is supplied to the blanket cylinder and applied by this on the substrate.

Depending on the machine configuration, the second gap 13 is thus arranged in a second coating unit C arranged downstream of the first coating unit B or a printing unit A in the conveying direction 7 of the printing substrate. In the conveying direction 7, a radiation / drying source 8 is arranged downstream of the second gap 13. Preferably, this radiation / drying source 8 is assigned to the counter-pressure cylinder 5 of the coating unit C at a distance adjacent. Alternatively, such Radiation / drying source 8 in a subsequent dryer section, formed of sheet guiding cylinders 5, 6 or a circumferential, gripper systems having sheet transport system (preferably designed as a traction mechanism) may be arranged.

Depending on the machine configuration, a radiation / drying source 8 associated with a cylinder 5 or 6 adjacent to the printing material can be arranged in the conveying direction 7 between the first gap 12 and the second gap 13.

In the processing of a relatively compressible printing material, for example cardboard, the counter-pressure cylinder 5 forming the second gap 13 can have at least one incompressible jacket surface. In a design as a double-sized impression cylinder 5, this has two incompressible lateral surfaces. On each of an incompressible lateral surface, an incompressible elevator can be arranged, which forms the mantle surface. The also the second gap 13 co-forming plate / form cylinder 2 carries the stamping mold 11th

In the processing of a relatively incompressible printing material, for example paper, the impression cylinder 5 forming the second gap 13 can have at least one compressible jacket surface. In a design as a double-sized impression cylinder 5, this has two compressible shell surfaces. Likewise, the counter-pressure cylinder 5 forming the second gap 13 can have at least one incompressible jacket surface and a compressible lift arranged thereon. Such an elevator contains at least one elastomer. The plate / forme cylinder 2 carries the stamping mold 11.

In Fig. 2 two coating units B, C are shown, which are part of a painting machine. Their structure is essentially analogous to the machine configuration according to Fig. 1 ,

When the embossing mold 11 is arranged on the plate / forme cylinder 2 of the second coating unit C, the metering device 9 is separated from the plate / forme cylinder 2 carrying the embossing mold 11 at least in one contact point 15. Alternatively, the metering device 9 may be temporarily removed from the second coating unit C. In a further embodiment, the second coating unit C can only be formed by a plate / forme cylinder 2 carrying the stamping mold 11 and a sheet guiding cylinder 5.
At least one of the second gap 13 in the conveying direction 7 downstream radiation / drying source 8 is one of the sheet guiding cylinder 5; 6 associated at a distance adjacent. In this case, the at least one radiation / drying source 8 may be arranged downstream of the counter-pressure cylinder 5 forming the second gap 13 in the conveying direction 7. Likewise, in the conveying direction 7 more sheet guiding cylinder 5; 6 be arranged downstream of the second gap 13 and at least one of the sheet guiding cylinder 5, 6 is at least one such radiation / drying source 8 associated at a distance adjacent.
In Fig. 3 an embodiment not affected by the invention is shown. Hereinafter, a coating unit B is disclosed, which is a first gap 12, which is shown by a lacquer leading cylinder 2, shown here as plate / forme cylinder 2, with at least one metering device 9 and one, a substrate, here sheet material, leading impression cylinder 5. In this gap 12, the surface of the printing material with a coating layer, in particular UV varnish, be coated over the entire surface or partially. In the conveying direction 7 follows a downstream, second gap 13, formed by a cylinder 11 carrying a mold 11, which may be a plate / forme cylinder 2, and a printing material (sheet material) leading impression cylinder 5. In the gap 13 forms the cylinder 2 with Embossing mold 11 with the counter-pressure cylinder 5, an embossing device 14, which is arranged downstream of the counter-pressure cylinder 5 of the coating unit B in the conveying direction 7. For this purpose, the impression cylinder 5 may be associated with a sheet guiding device 10. Depending on requirements, the embossing device 14 may be arranged in the sheet exit or vertically below the axis or in the sheet exit of the counter-pressure cylinder 5. In Fig. 3 is
the embossing device 14 shown in the arch.
Alternatively, instead of the coating unit B, a printing unit A can fulfill the function of a coating unit, as may be the case, for example DE 197 29 985 A1 or DE 10 2005 010 207 A1 is known.
The embossing device 14 may comprise at least one further sheet guiding cylinder 5; 6 or a boom (not shown) to be arranged downstream. Similarly, the embossing device 14, ie, the second gap 13, a radiation / drying source 8 downstream in the conveying direction 7 (not shown). The radiation / drying source 8 can one of the embossing device 14 immediately downstream sheet guiding cylinder 5; 6 adjacently disposed at a distance and / or arranged in a boom for sheet material.
If necessary, the plate / forme cylinder 2 with embossing mold 11, a washing device on / off be assigned for the purpose of cleaning the embossing mold 11.
The operation is as follows: The sheet material is preferably transported by means of the sheet guiding cylinder 5, 6 in the conveying direction 7 and in a first gap 12, comprising a lacquer leading cylinder 2 with at least one metering device 9 and a, the sheet material leading impression cylinder 5 with a lacquer layer over the entire surface or partially coated. The paint used is a UV varnish. Thereafter, in a downstream second gap 13, comprising a cylinder 2 carrying an embossing mold 11 and a counter-pressure cylinder 5 carrying the sheet material, the sheet material carrying the lacquer layer is embossed. In this case, the not yet polymerized UV lacquer layer is embossed on the surface of the sheet material located. Subsequently, the lacquer layer is polymerized by means of at least one radiation / drying source 8.
If necessary, the sheet material can be fed to a downstream in the conveying direction 7 sheet delivery and stored on a delivery pile.

LIST OF REFERENCE NUMBERS

1

Blanket cylinder

2

Plate / Formzyl inder

3

inking

4

dampening

5

Impression cylinder (sheet guiding cylinder)

6

Transfer cylinder (sheet guiding cylinder)

7

conveying direction

8th

Radiation / drying source

9

metering

10

sheet guiding device

11

stamping die

12

first gap

13

second gap

14

embosser

15

contact point

A

printing unit

B

first coating plant

C

second coating unit

Claims (11)

1. A method for coating and embossing a printing material in a processing machine, wherein, in a first gap (12), comprising a lacquer-guiding cylinder (2) comprising at least one metering unit (9) and a printing material-guiding impression cylinder (5), the surface of the printing material is coated with a lacquer layer and embossing occurs subsequently in a downstream second gap (13), comprising a cylinder (2) bearing an embossing die (11) and an impression cylinder (5) guiding the printing material, into the printing material bearing the lacquer layer, wherein the printing material is coated with a UV lacquer in the first gap (12), characterized in
   that embossing occurs subsequently in the second gap (13) into the lacquer layer, which is located on the surface of the printing material and which is not yet polymerized, and that the lacquer layer is polymerized subsequently.
2. A device for coating and embossing a printing material in a processing machine, wherein, in a first gap (12), comprising a lacquer-guiding cylinder (2) comprising at least one metering unit (9) and a printing material-guiding impression cylinder (5), the surface of the printing material is coated with a lacquer layer and embossing occurs subsequently in a downstream second gap (13), comprising a cylinder (2) bearing an embossing die (11) and an impression cylinder (5) guiding the printing material, into the printing material bearing the lacquer layer, wherein the first gap (12) is arranged in a first coating unit (B) or a printing unit (A), and the printing material can be coated with a UV lacquer, and the second gap (13) is arranged in a second coating unit (C) downstream from the first coating unit (B) or printing unit (A) in the conveying direction (7) of the printing material,
   characterized in
   that a radiation/drying source (8) is arranged downstream from the second gap (13) in the conveying direction (7).
3. The device according to claim 2, characterized in that a radiation/drying source (8), which is assigned adjacently to the printing material-guiding cylinder (5), is arranged between the first gap (12) and the second gap (13) in the conveying direction (7).
4. The device according to claim 2, characterized in that, in response to the processing of a compressible printing material, the impression cylinder (5), which forms the second gap (13), has at least one incompressible jacket surface.
5. The device according to claim 4, characterized in that an incompressible lift is arranged on the incompressible jacket surface.
6. The device according to claim 2, characterized in that, in response to the processing of an incompressible printing material, the impression cylinder (5), which forms the second gap (13), has at least one compressible jacket surface.
7. The device according to claim 2, characterized in that, in response to the processing of an incompressible printing material, the impression cylinder (5), which forms the second gap (13), has at least one incompressible jacket surface and a compressible lift arranged thereon of at least one elastomer.
8. The device according to claim 2, characterized in that the radiation/drying source (8) arranged downstream from the second gap (13) is assigned adjacently at a distance to a sheet-guiding cylinder (5; 6).
9. The device according to claim 2 and 8, characterized in that the radiation/drying source (8) is arranged downstream from the impression cylinder (5), which forms the second gap (13), in the conveying direction (7) .
10. The device according to claim 2, characterized in that a washing device is assigned to the plate/forme cylinder bearing the embossing die (11) so as to be capable of being switched off/on.
11. A device for coating and embossing a printing material in a processing machine,
    wherein, in a first gap (12), comprising a lacquer-guiding cylinder (2) comprising at least one metering unit (9) and a printing material-guiding impression cylinder (5), the surface of the printing material is coated with a lacquer layer and embossing occurs subsequently in a downstream second gap (13), comprising a cylinder (2) bearing an embossing die (11) and an impression cylinder (5) guiding the printing material, into the printing material bearing the lacquer layer,
    wherein the first gap (12) is arranged in a first coating unit (B) or a printing unit (A), and the printing material can be coated with a UV lacquer, that the second gap (13), formed by a cylinder (2) bearing an embossing die (11) and an impression cylinder (5) guiding the printing material, forms an embossing device (14) in the conveying direction (7), which embossing device is arranged directly downstream from the impression cylinder (5) of the first gap (12) in the coating unit (B) or in the printing unit (A),
    characterized in
    that a radiation/drying source (8) is provided downstream from the embossing device (14) and the second gap (13) in the conveying direction (7).

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