DE102006062012A1 - Image producing layer e.g. metallization layer, transferring device for e.g. sheet offset printing machine, has foil guidance provided in coating unit for supply of web to transfer gap as exchange units in contrary to functional units - Google Patents

Abstract

The device has an application unit (1) for an image moderate coating of printing sheet with an adhesive. A coating unit (2) is provided for transmission of image producing layers from a carrier foil to the printing sheet. The coating unit has an impression cylinder (4) and a press roll (3). One or several foil guidance (14) or foil guiding devices (20) are provided in the coating unit for supply of web of the carrier foil to a transfer gap (6) as exchange units in contrary to functional units of a printing unit forming the coating unit.

Description

The The invention relates to a device for transferring imaging layers from a carrier film on printed sheet according to the preamble of claim 1

It is known to produce metallic layers on printed sheets by means of a film transfer process. So is in the EP 0 569 520 B1 a printing material and a printing apparatus using this material are described. In this case, a sheet-processing machine is shown, which has a feeder and a boom, between two units printing units and a coating unit are arranged. In at least one of the printing units, an adhesive pattern is applied by means of the planographic printing process. This adhesive pattern is applied in a cold printing process and has a specific imaging subject. In the printing unit following the coating unit with a counter-pressure cylinder and a press roller a film guide is provided. This is designed in such a way that a film strip or a transfer film is passed through the transfer nip of the coating unit between the impression cylinder and the press roll from a film supply roll. The foil strip is rewound on the outlet side after leaving the coating unit. The transfer film has a carrier layer on which imaging layers such as metallic layers, for example of aluminum, can be applied. Between the metallic layer and the carrier film, a separating layer is provided, which ensures that the metallic layer can be removed from the carrier layer.

At the Transport of press sheets through the printing unit will print each sheet provided with an adhesive pattern. Thereafter, the sheet is through led the coating unit, wherein by means of the press roller the resting on the impression cylinder sheet with the sheet material is associated. It goes down metallic layer a close connection with the adhesive provided Areas on the sheet. After further transport of the printing sheet, the metallic layer adheres only in the area the pattern provided with adhesive. The carrier foil So the metallic layer is in the range of adhesive pattern taken. The used in this way transfer film will be back wound. The print sheet is laid out in the coated state.

It is known such coating units, for example in printing units of printing presses. A disadvantage of the known devices is that they are not flexible and that the feeder the transfer film consuming and difficult to handle is.

task The invention is therefore to provide a device by means of which the transfer of an imaging layer z. B. a metallization layer, on a sheet can be done safely, economically and accurately, the device should be easy to handle.

The Solution of this problem results in a device according to the features of claim 1.

Favorable Way is to guide the transfer film a feeder used in which the transfer film during feeding led to the transfer gap through a modular control system becomes.

The Device is also advantageously used to a Improvement of the film utilization to achieve that the Transfer film in one or more Teilfolienbahnen lesser width is split. In combination with the aforementioned method can so different types of films are used side by side.

According to the invention within a printing unit existing recording devices or Aggregate assemblies used to guide devices for the Include or integrate film transport.

So can be a guide for a removable from the printing unit Blanket washing device firmly mounted in the machine frame Have recording devices. In these recording devices Film guiding devices are corresponding to the receiving devices Inserted holding elements. The appropriate assembly or disassembly is preferably done without tools. The assembly is preferably in sheet travel direction from the printer side broadside.

The same applies to a printing cylinder blowing device provided in the printing unit, which serves the bowing. Here is the assembly of control devices possibly also at the front to a printing unit by insertion into mounting holes respectively.

Farther can an integrated cardboard guide or blow bar directly as a guide for guiding the transfer film in the Transfer gap can be used. Correspondingly designed deflection rollers can be adjusted so that the entry angle of the Film web is adjustable in the transfer nip.

A film guide may optionally be integrated on the outlet side of the film web forming a channel or an active protective device against interference on a printing unit protection. The printing unit Protection can continue to be adjustable in a guide position, in which the channel is released for discharging the film web to the guide devices. This setting can be done automatically when operating with foil application. During normal machine operation, the print engine protection also automatically closes the channel again.

A Film guide can be on the outlet side of the film web possibly an active protection against engagement forming as an adapter element Can be integrated with quick-release device on a printing unit protection be. The function can be designed as described above. Here, the automatic control with the insertion or removal be connected to the pressure element protection of the adapter element.

in the Below, the invention is illustrated in more detail with reference to figures.

there demonstrate:

1 a printing machine with a film transfer device,

2 a film guide on a press roll and

3 a film guide in detail.

1 shows a sheet-processing machine, here a printing machine with two printing units. With the printing units, a cold foil transfer process is performed. First, a printed sheet is provided with an imaging adhesive pattern (applicator 1 with inking / dampening unit 11 , Plate cylinder 12 and rubber or blanket cylinders 13 ). Thereafter, in the next printing unit, together with a printing sheet, a transfer film 5 through a transfer gap 6 guided, with the transfer film 5 in the transfer gap 6 pressed against the sheet (coating 2 with press roller 3 and impression cylinder 4 ). The transfer gap 6 in the coating plant 2 is through a press roll 3 and an impression cylinder 4 educated. The press roll 3 may be the blanket cylinder of an offset printing unit or the forme cylinder of a paint module of a sheet-fed press, preferably a sheetfed offset press. transfer films 5 have a carrier layer and a release layer to form an imaging layer. The separating layer serves to facilitate the lifting of the imaging layer from the carrier layer. The image-forming layer may be a metallized layer or a glossy layer or a texture layer or a colored layer or a layer containing one or more image patterns. The foil supply roll 8th is the coating plant 2 assigned on the side of the sheet feeder. The foil supply roll 8th has a rotary drive 7 on. The rotary drive 7 is used for continuous controlled feeding of the transfer film to the coating unit 2 needed and is therefore controllable. Furthermore, a deflecting or tensioning roller is provided in the region of the film feed. Thus, the film web of the transfer film 5 always in the same tension against the press roller 3 held. On the downstream side of the coating unit 2 is a foil collecting roll 9 arranged on the used sheet material is wound up again. For the optimized production is a rotary drive 7 provide that is controllable. The transfer foil 5 can also by the rotary drive 7 moved on the drain side and kept taut on the inlet side by means of a brake.

For the transfer process of the imaging z. B. metallized layer on the substrate in the transfer nip 6 is essential that the surface of the press roll 3 is equipped by means of a compressible, damping element. The press roll 3 can do this with a press cover 10 For example, be provided as a plastic coating, comparable to a blanket or blanket. The press fabric 10 is held in a cylinder channel on jigs. The press fabric 10 is to improve the transmission properties in the transfer nip 6 equipped with a targeted elasticity or compressibility that can be generated by means of conventional blankets or combined coverings of a blanket and a pad.

Furthermore, you can directly on the press roller 3 or be provided on the press fabric one or more limited to Sujetbereiche pressing surfaces.

The arrangement of a press roll can also be carried out within an integrated film transfer module FA together with a processing unit within the scope of the invention. For this purpose, a printing unit (here, for example, commissioned work 1 in 1 ) used for the adhesive application and the nip of the adhesive application on the same impression cylinder 4 arranged downstream of this printing unit a separate press roll. Alternatively, on a printing unit (here, for example, coating plant 2 to 1 ) An accessory for the adhesive application on the impression cylinder 4 the transfer gap 6 be preceded. Both embodiments result in a compact design.

For intermediate or post-treatment of the adhesive layer or of the transfer image applied thereon, it is possible to use dryers 25 the applicator 1 or the coating plant 2 be provided downstream. Here come in particular in conjunction with a corresponding adhesive UV dryer in question.

To control the applied transfer image, the coating plant 2 subordinate a monitoring system 26 be provided for sheet inspection. By means of such a monitoring system 26 In addition to errors in the transfer image, defects in the cold foil stamping process can also be identified.

To ensure the efficiency of the coating process, it can be provided that the film feed of the transfer film 5 from the film supply roll 8th to the transfer gap 6 and to the foil collecting roll 9 is controllable so that as far as possible the transfer film 5 is then stopped if no transmission of the imaging layer is to take place:
For this purpose, a control of the transfer film 5 such that when passing through a gripper of the sheet-guiding impression cylinder 4 receiving cylinder channel and a correlating cylinder channel of the press roll 3 the transport of the transfer film 5 is stopped. The timing of the film feed can according to a necessary acceleration or braking of the film supply roll 8th or film collecting roll 9 about so-called dancer rollers 18 or the rotary actuators 7 the film rolls 8th . 9 be executable.

An improvement in the film utilization of the type described results when the transfer film 5 is divided into one or more Teilfolienbahnen lesser width. Thus, with appropriate control by means of the device or devices for timing the film feed each of the partial film webs, the utilization of the transfer film 5 be improved even with zonally different lengths coating areas within a sheet.

According to the invention for this purpose in 2 shown device for film guide on a press roll 3 provided, which is substantially tangential to the press roll 3 through the transfer gap 6 with the impression cylinder 4 of the coating plant 2 to be led. These include a corresponding Folienleiteinrichtung 20 and a film feeding device 30 , which are described below, and the film web 5 in the transport direction T through the coating plant 3 to lead.

A film guide is provided 14 which is approximately tangential between the press roll 3 and the impression cylinder 4 is aligned and a wrap of the press roll 3 forms less than 90 degrees. This will be a defined investment and leadership of the film web 5 on the press roller 3 achieves and at the same time the necessary conditions for a possible foil timing or a foil failure in the transfer gap 6 during a channel passage in the transfer nip 6 , but also for the use of narrow film webs 5 , created.

The film guide 14 for a film web 5 or partial film webs 19 includes on the inlet side to the transfer nip 6 starting from an inlet opening 16 on a printing unit protection 15 some guide rollers 22 , These can be arranged differently depending on the configuration of the printing unit. The film guide 14 can according to 2 in conjunction with a pressure cylinder blowing device 36 be arranged. This has blowing openings for the formation of blown jets S, on the one hand for guiding a printing material B on the impression cylinder 4 when entering the transfer gap 6 be used. The printing cylinder blowing device 36 but also for pneumatic support on the film web 5 be directed to keep them wrinkle-free and taut. By appropriate arrangement of Druckzylinderblasvorrichtung 36 If necessary, one of the guide rollers 22 for guiding the film web 5 be replaced part of the film guide 14 can also be a mechanical or pneumatic guide element on the edge of the printing unit protection 15 in the area of the entrance opening 16 be that the foil web 5 when entering the coating plant 2 Taut and holds. The foil web 5 also becomes a cleaning device 39 passed, the press roller 3 assigned. The cleaning device 39 removes soils resulting from film processing from the press roll 3 ,

Another part of the film guide 14 includes on the drain side of the transfer nip 6 starting to an outlet opening 17 on a printing unit protection 15 further guide rollers 32 . 34 , These can in turn be arranged differently depending on the configuration of the printing unit. The film guide 14 is here in connection with an inlet protection 33 arranged. This serves to secure the transfer gap 6 against unintentional interventions. The foil web 5 can be around the run-in protection 33 or be guided through openings in the contour. The guide rollers 32 . 34 can in conjunction with the print engine protection 15 be arranged so that they slide the film web 5 take. Alternatively, the lead role 34 be arranged adjustably, so that the wrap angle of the film web 5 on the press roller 3 is adjustable.

In this context, it is also important that the transfer film 5 at a channel passage in the transfer gap 6 with grippers G on the impression cylinder 4 can come into contact. The grippers G hold a signature B at its leading edge on the impression cylinder 3 for secure transport through the transfer gap 6 firmly. They stand with their so-called gripper back in the area of the entrapment of the edge of the Druckbo B to a small extent over the circumference of the impression cylinder 4 above. Coordination to one at the press roll 3 also existing channel is chosen so that its associated edge only after the contour of the gripper G with the impression cylinder 4 comes into contact. Because the film web 5 but freely over the channel of the press roll 3 is curious, the gripper G in the unsupported there film web 5 Push. For this purpose, it is advantageous to make the wrap angle of the film web adjustable, to early separation of the gripper G of the film web 5 at the channel pass in the transfer gap 6 to reach.

Preferably, the gripper G with one in the smallest possible extent over the circumference of the impression cylinder 4 protruding contour formed. Here, systems of grippers G can be used, the total continuous or intermittently radially to the impression cylinder 4 are adjustable so that the height of the gripper G can be minimized over the cylinder contour.

The film guide can be further supported by the fact that the cylinder channel of the press roll 3 is provided with a cover for largely cylindrical complement of the surface of the press roll. This will make the film web 5 Although in the area of the gripper G closer to the impression cylinder 4 introduced, the film guide is overall but continuous and quiet.

In addition, the leadership of the transfer film 5 be influenced by a further guide roller, in the area after the film removal from the film supply roll 8th is arranged. By means of this guide roller 38 , in their axial position relative to the position of the axis of the film supply roll 8th is adjustable, unevenness or irregularities of the film flow from the film supply roll 8th before feeding the film web 5 for film guidance 14 be compensated.

According to 3 is a slide-in cassette 21 provided with guide elements made of metal and / or plastic (CFRP). As guide elements by means of integrated are first rotating guide rollers 22 intended. Air-purged blow rods or blow rods made of sintered metal with air outlet to the film web can also be used 5 out, so the transfer film 5 is worn on an air cushion. The guide rollers 22 can be made of aluminum or reinforced plastic, z. B. CFK, so they are easy to build and thus the lowest possible stress in the film web 5 enter. The guide rollers 22 may be surface-coated, e.g. B. with Teflon or others, the adhesion of the transfer film 5 reducing coatings. The guide rollers 22 associated guide plates 23 , which can be coated in the same sense, serve the planar guidance of the film web 5 , The guide plates 23 preferably form a guide channel 24 and serve both for film guidance (deflection) during the film run and also as an insertion aid when film feeding at the beginning of a production process.

The slide-in cassette 21 may be assigned a Druckzylinderblasvorrichtung or the slide-in cassette 21 may be configured with the Druckzylinderblasvorrichtung together as a unit. This allows the slide-in cassette 21 at the same time for sheet guiding on the impression cylinder 4 be used.

The film guide 20 may also be supported by means for generating blown air. For this purpose, it can at the film exit to the transfer gap 6 between the press roll 3 and the impression cylinder 4 a blowing device 16 comprising one or more bundled or fan-shaped air jets S for sheet guiding below the film web 5 leads to the substrate. In particular, the combination comes with a Druckzylinderblasvorrichtung in question.

The film guide 20 can at the most critical deflection or exit positions easily replaceable guide elements, eg. B. the guide rollers 22 or the guide plates 23 , Have, so that the service parts are easily replaceable.

The film guide 20 can be assigned to a cardboard guide or integrated with this in a structural unit to the contact between the film web 5 and printing material (cardboard) even before their entry into the transfer nip 6 between the press roll 3 and the impression cylinder 4 to prevent.

Outlet side, ie in the transport direction of the film web 5 after the transfer gap 6 between the press roll 3 and the impression cylinder 4 , is above the film web 5 a support plate 29 possibly charged with blowing air, arranged. Below the film web 5 can be a baffle 27 to be inserted temporarily to the film feeder.

On the outlet side, a foil deflection is preferred in an existing printing unit protection 15 of the coating plant 2 z. As a protection for an automatic plate feeder integrated. Here again is the use of a leader 32 or a coated guide plate 28 or a possibly luftumspülten deflecting possible.

The mentioned printing unit protectors 15 can when operating a printing unit as a coating plant 2 with foil webs 5 automatically into a defined, preselectable and lockable opening be driven position, leaving an appropriately sized inlet opening 16 or outlet opening 17 for the film web 5 is created.

For foil insertion, a guide or drawstring or strip of metal or plastic or foil is attached to the foil leading edge of the unwinding roll. By means of this auxiliary device, the film web 5 through the film guide 20 within the coating plant 2 pushed or pulled.

The coating plant 2 can also be a partially or fully automated collection device 30 be assigned, z. B. by cable, chain hoist, belt. In this case, both the entire path of the film web 5 or only the area within the coating unit (printing unit of a sheet-fed offset printing press or coating module in a sheet-fed printing machine). By means of the described Folienfüh tion 14 respectively. 20 can both a film feeder and a film guide within a coating plant 2 be enabled. This ensures operability at all times and setup times are minimized. Finally, by means of the film guide 14 respectively. 20 an extensive automation of all work and settings in the film insertion and film feedthrough possible.

According to the invention within a printing unit existing recording devices or Aggregate assemblies used to guide devices for the Include or integrate film transport.

So can be a guide for a removable from the printing unit Blanket washing device U firmly mounted in the machine frame Have recording devices, in the Folienleiteinrichtungen can be used with corresponding holding elements. The assembly takes place preferably in the sheet running direction from the printing unit broadside.

The same applies to an intended in the printing unit Druckzylinderblasvorrichtung V. Here, the assembly of the guide on the front side to a printing unit by insertion into mounting holes done.

Farther can an integrated cardboard guide or blowbar X directly used as a guide of the transfer film in the transfer nip become.

If necessary, a film guide can form a channel or an active protective device Y against engagement in the vicinity of a printing unit protection on the outlet side of the film web 15 be integrated.

A Film guide can be on the outlet side of the film web possibly an active protection against engagement forming as an adapter element Z can be integrated with a quick-release device on a printing unit protection be.

1

commissioned

2

coating plant

3

press roll

4

Impression cylinder

5

Transfer film / sheet

6

transfer nip

7

roller drive

8th

Film supply roll

9

Foil composite role

10

Press covering

11

Inking / dampening unit

12

plate cylinder

13

Rubber / blanket cylinder

14

film guide

15

Printing plant security

16

blower

17

Entry / exit opening

18

dancer roll

19

Part sheet

20

Folienleiteinrichtung

21

plug-in unit

22

sheave

23

guide plate

24

guide channel

25

dryer

26

monitoring system

27

baffle

28

guide plate

29

Support plate

30

Sheet feeding device

31

capstan

32

sheave

33

Made

34

sheave

35

bracket

36

Druckzylinderblasvorrichtung

37

blower

38

guide roll

39

cleaning device

S

blowing jet

G

grab

B

substrate

T

transport direction

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 0569520 B1 [0002]

Claims (14)

Device for transfer of image-forming layers from a carrier foil to printed sheets at least with an applicator ( 1 ) for an imagewise coating of a printed sheet with an adhesive and with a coating unit ( 2 ) for transferring the imaging layers from the carrier film to the printing sheet, wherein the coating module ( 2 ) an impression cylinder ( 4 ) and a press roll ( 3 ), which has a common transfer gap ( 6 ), and further wherein the carrier film around the press roll ( 3 ) is feasible, such that it with the coated side on the on the impression cylinder ( 4 ) guided printed sheet and under pressure together with the sheet through the transfer nip ( 6 ) between press roll ( 3 ) and impression cylinder ( 4 ) is guided, so that the imaging layers after the exit of the sheet from the transfer nip ( 6 ) is adhered to the printed sheet in the area of the adhesive areas provided with adhesive and is lifted off the carrier sheet, characterized in that in the coating unit ( 2 ) one or more foil guides ( 14 ) or film guiding devices ( 20 ) for feeding the web of the carrier film ( 5 ) to the transfer nip ( 6 ) as exchange elements against functional elements of the coating module ( 2 ) forming printing unit are provided. Apparatus according to claim 1, characterized in that in the coating plant ( 2 ) a film guide ( 14 ) with one or more film guide elements for deriving the web of the carrier film ( 5 ) from the transfer nip ( 6 ) are provided away. Apparatus according to claim 2, characterized in that Folienleitelemente, preferably in the form of guide rollers ( 32 . 34 ) and / or baffles ( 27 . 28 . 29 ), as a structural unit in the coating plant ( 2 ) and / or on a printing unit protection ( 15 ) are provided releasably usable or convertible. Apparatus according to claim 3, characterized in that the foil guiding elements have receiving devices which are connected to holders of in the printing unit of the coating module ( 2 ) can be removably arranged, so that the foil-guiding elements can be inserted or moved in a detachable manner in which the coating module ( 2 ) forming printing unit are attachable. Apparatus according to claim 1 to 3, characterized in that the film guiding device ( 14 . 20 ) as a unit in the manner of a slide-in cassette ( 21 ) in the coating plant ( 2 ) is releasably lockable used and / or provided reversible. Apparatus according to claim 5, characterized in that the film guiding device ( 14 . 20 ) a structural unit with one of the surface of the impression cylinder ( 4 ) forms associated Bedruckstoffleitvorrichtung. Apparatus according to claim 6, characterized in that the film guiding device ( 14 . 20 ) a structural unit with a on the surface of the impression cylinder ( 4 ) directed pressure cylinder blowing device ( 36 ). Apparatus according to claim 6, characterized in that the guide device is provided with a blowing device, by means of which blowing air below the film web ( 5 ) against one on the surface of the impression cylinder ( 4 ) guided printing material can be directed. Apparatus according to claim 6, characterized in that the guide device is a structural unit with one of the surface of the impression cylinder ( 4 ) associated cardboard guide forms. Apparatus according to claim 6, characterized in that the guide device for receiving in the holder of one of the surface of the press roll ( 3 ) associated washing device is formed. Apparatus according to claim 6, characterized in that the guide device for receiving in the holder of one of the surface of the impression cylinder ( 4 ) associated blowing device is formed. Device according to claims 6 to 11, characterized in that the guide device is designed as a guide roller or guide roller pair is. Device according to one of claims 1 to 12, characterized in that the transfer film ( 5 ) is divided into one or more Teilfolienbahnen lesser width and that by means of Folienleiteinrichtung ( 20 ) the partial film webs next to each other the transfer gap ( 6 ). Device according to one of claims 1 to 13, characterized in that the film guiding device ( 20 ) Has guide elements, by means of which the partial film webs next to each other the transfer nip ( 6 ).