EP3878652B1 - Method for producing printed sheets from a web - Google Patents

Description

The present invention relates to a method for producing printed sheets from a web.

In DE 27 48 675 B1 describes a method for producing laminated sheets, in which cover sheets are laminated onto a carrier web and the laminated web is then separated into individual laminated sheets. The cover sheets are provided with a printed image.

In CH120824A describes a method in which a web is coated with color and then cut into sheets and then the sheets are printed.

In EP 2 441 583 A2 describes a method in which a web or film is coated with adhesive and the web is then treated by means of the film and the web is then cut into sheets.

In DE 20 2013 104 546 U1 and U.S. 10,022,939 B1 a method is described in each case in which foil is glued to a printing material.

The object of the invention is to specify a further method for producing printed sheets from a web.

This object is achieved by a method having the features of claim 1.

An advantage of the method according to the invention is that it is not only suitable for printing material made of paper or cardboard, but also for printing material made of plastic. The web from which the printed sheets are made can therefore be a paper web, cardboard web or plastic web.

An additional benefit is that the fluid can be a radiation curable fluid, e.g. B. a UV-curable fluid.

Various developments of the method according to the invention are possible.

The first step, second step, third step and fourth step can be performed inline.

In the first step, the fluid can be applied to the web as an adhesive for a cold foil transfer process, in the second step a transfer layer of the foil can be detached from a carrier layer of the foil and transferred to the adhesive on the web, and before the third step the adhesive can be placed between of the transferred transfer layer and the web can be cured by UV irradiation to firmly bond the transfer layer to the web.

In the first step, the fluid can be applied as an adhesive for a cold foil transfer process to a transfer layer of the foil, in the second step the transfer layer with the adhesive can be detached from a carrier layer of the foil and transferred to the web, and before the third Step the adhesive between the transferred transfer layer and the web is cured by UV radiation in order to firmly connect the transfer layer to the web.

In a further development, the fluid can be applied to the web as an embossing layer for a cast-and-cure process in the first step, the film can be used as an embossing film in the second step and a surface structure can be embossed into the embossing layer using the embossing film and before the third step, the embossing layer on the web can be hardened by UV radiation in order to permanently strengthen the surface structure.

In the fourth step, the sheets can be printed in an offset printing process.

The invention also includes a device for carrying out the method according to the invention or one of the methods corresponding to the development, the device being characterized in that a printing material unwinding station, a fluid coating station, a film transport station, a cross-cutting station and a sheet-fed printing station in are arranged one after the other in the order mentioned.

An advantage of the device according to the invention is its good suitability for carrying out the method in-line.

Figur 1

ein Schema des Ablaufs der Schritte des Verfahrens und

Figur 2

eine Vorrichtung zur inline erfolgenden Durchführung des Verfahrens.

Further structurally and functionally advantageous developments result from the following description of exemplary embodiments and the associated drawing, which shows:

figure 1

a scheme of the flow of the steps of the method and

figure 2

a device for carrying out the method in-line.

figure 1 shows a flow chart of the manufacturing method, in which a first step 100, second step 200, third step 300 and fourth step 400 take place one after the other in the order mentioned. Further steps can take place between steps 100 to 400, e.g. B. with a corona treatment of web 1.

In the first step 100, the web 1 or the film 24 is coated with a fluid. When the fluid is an adhesive for a cold foil transfer process, the fluid can be applied to web 1 or foil 24, or both. If the fluid is to serve as an embossing compound into which a surface structure is to be embossed in a cast-and-cure process, the fluid is applied to web 1,

In the second step 200 the web 1 is treated by means of the foil 24 . In the case of the cold foil transfer method, this treatment can consist of detaching a transfer layer from the foil 24 and adhering the transfer layer to the web 1 and in the case of the cast-and-cure method in the already mentioned embossing of the surface structure using the foil 24 as an embossing tool.

In the third step 300 the web 1 is cut into sheets 9 . The format of the sheets 9 is constant during a print job and can vary from print job to print job.

In the fourth step 400, the sheets 9 are printed, which can be done by flexographic printing, screen printing, digital printing (eg inkjet) or preferably offset printing (planographic). The printing material forming web 1 and later sheets 9 can be paper, cardboard or plastic.

figure 2 shows a machine arrangement with which the manufacturing method can be carried out in an inline process. In a printing material unrolling station 11, the web 1 is unwound from a roll and transported in the printing material transport direction BT. The first step 100 is carried out in a fluid coating station 2 . In this case, the web 1 is coated with the required fluid over the entire surface or over part of the surface (e.g. spot coating).

The fluid coating station 2 can be designed as a cassette and can be exchanged for another. For example, one fluid-coating station 2 can be specially designed for applying a highly viscous fluid and the other fluid-coating station 2 can be specially designed for applying a low-viscosity fluid. The fluid coating station 2 shown comprises a chamber doctor blade 12, anilox roller 13, applicator roller 14 and counter-pressure roller 15.

The second step 200 is carried out in a film transport station 3 and the film 24 is thereby moved in the film transport direction FT from an unwinding roller 16 to a winding roller 17 . In a contact zone 4, the web 1 and the film 24 running synchronously with it are pressed together. With the cold foil transfer process, the transfer layer is transferred and with the alternative cast-and-cure process, the micro-relief is embossed. The film 24 and web 1 pass together through a press nip formed by a nip roll 18 and a backing roll 19 therebetween.

The fact that the printing material is processed in the film transport station 3 in the form of web 1 and not in the form of sheets is advantageous with regard to the contact between film 24 and printing material. For the transport of the web 1, the counter-pressure roller 19 does not require any grippers, which, on the contrary, would be required for holding sheets and would impair said contact.

Within the contact zone 4, the fluid film between the foil 24 and web 1 is cured with a curing device 5 by irradiation, e.g. B. with UV radiation, cured, whereby the fluid polymerizes. The radiation from the curing device 5 passes through the film 24, which can be transparent or UV-transmissive for this purpose.

The third step 300 is carried out in a cross-cutting station 6 . The cross-cutting station 6 comprises a web store 20 with a meandering course of the web 1, guide or transport rollers 21, 22 and a knife roller 23 as a cutting tool. The knife roller 23 cuts the web 1 provided with the transfer layer or the embossed embossing layer into sheets 9 of the same size, each of which then carries the transfer layer or embossing layer. The sheets 9 can be coated with the transfer layer or embossing layer over the entire surface or only over a partial surface.

The cross-cutting station 6 can be equipped with a register cutting system. In a variant of the register cutting system, this has a cutting mark sensor, and the cut takes place according to a cutting mark, which is previously printed or applied to the web. The cutting mark can be formed by cold foil glued to the web, cold foil adhesive alone (without cold foil), embossed cast-and-cure elements (embossing layer) or cast-and-cure fluid alone (embossing fluid without embossing).

In an alternative variant, the register cutting system has a camera that has high resolution and works using the transmitted light method, with the cutting mark being detected in transmitted light or a watermark functioning as a cutting mark. In both variants, the knife roller 23 is decelerated or accelerated during its rotation in order to hit the cutting mark with sufficient accuracy.

The fourth step 400 is carried out in a sheet printing station 10 to which the cross-cutting station 6 transfers the sheets 9 . The sheet-fed printing station 10 can include one or preferably more printing units, e.g. B. for multi-color offset printing. The sheet printing station 10 can print the printed image next to or on the layer produced with the fluid on the sheet 9. For example, the printed image can be placed next to a hologram formed by the embossing layer. Alternatively, it is possible to place the printed image on the transfer layer, e.g. B. when this is a silver aluminum layer overprinted with yellow ink to create a gold effect.

It is advantageous here that the pressure is applied to the side of the transfer layer that was just exposed when the transfer layer was detached from the film 24 and that was previously “sealed” by the carrier layer of the film 24, so to speak. Due to the rapid sequence of steps in the inline process, there is no noticeable aging of the side of the layer to be printed between the second step 200 and the fourth step 400, which could otherwise impair its printability.

The arrangement of corona devices for treating the web 1 is indicated with arrow symbols (reference symbols “7” and “8”) in the event that the web 1 consists of plastic. The corona device 7 is arranged in front of the fluid coating station 2 in the printing material transport direction BT, and the corona device 8 between the contact zone 4 and the knife roller 23.

Reference List

1

Rail

2

fluid coating station

3

Foil transport station

4

contact zone

5

curing device

6

cross cutting station

7

Corona facility

8th

Corona facility

9

bow

10

sheet-fed station

11

Substrate unwind station

12

chamber doctor blade

13

anilox roller

14

application roller

15

backing roller

16

unwind roll

17

take-up roll

18

pressure roller

19

backing roller

20

railway storage

21

transport roller

22

transport roller

23

knife roller

24

foil

100

first step

200

second step

300

Third step

400

fourth step

BT

substrate transport direction

FT

Foil transport direction

Claims (7)

1. Method of manufacturing printed sheets (9) out of a web (1), wherein the web (1) or a foil (24) is coated with a fluid in a first step (100),

   wherein the web (1) is subsequently treated by means of the foil (24) in a second step (200),

   wherein the web (1) is subsequently cut into sheets (9) in a third step (300),

   wherein the sheets (9) are subsequently printed on in a fourth step (400), and

   wherein cutting marks formed by a glued-on cold-foil transfer layer or by cold-foil glue without cold foil or by an embossed cast-and-cure surface structure or by a cast-and-cure fluid without embossment are applied to the web (1) before the third step (300).
2. Method according to claim 1,
   characterized
   in that the first, second, third, and fourth steps (100, 200, 300, 400) are carried out in line.
3. Method according to claim 1 or 2,
   characterized

   in that in the first step (100), the fluid is applied to the web (1) as a glue for a cold-foil transfer process,

   in that a transfer layer of the foil (24) is removed from a carrier layer of the foil (24) and transferred to the glue on the web (1) in the second step (200), and

   in that before the third step (300), the glue between the transferred transfer layer and the web (1) is cured by UV radiation to firmly bond the transfer layer to the web (1).
4. Method according to claim 1 or 2,
   characterized

   in that in the first step (100), the fluid is applied to a transfer layer of the foil (1) as a glue for a cold-foil transfer process,

   in that in the second step (200), the transfer layer is removed with the glue from a carrier layer of the foil (24) and transferred to the web (1), and

   in that before the third step (300), the glue between the transferred transfer layer and the web (1) is cured by UV radiation to bond the transfer layer firmly to the web (1).
5. Method according to claim 1 or 2,
   characterized

   in that in the first step (100), the fluid is applied to the web (1) as an embossment layer for a cast-and-cure process,

   in that in the second step (200), the foil (24) is used as an embossment foil to emboss a surface structure into the embossment layer by means of the embossment foil, and in that before the third step (300), the embossment layer is cured on the web (1) by UV radiation to permanently solidify the surface structure.
6. Method according to any one of claims 1 to 6,
   characterized
   in that in the fourth step (400), the sheets (9) are printed on in an offset printing process.
7. Device for implementing a method according to any one of claims 1 to 6,
   characterized
   in that a web-unwinding station (11), a fluid coating station (2), a foil transport station (3), a cross-cutting station (6), and a sheet printing station (10) are provided and succeed one another in the given order.

Images