DE102006003311A1 - Method for producing printed image effects with directional viewing by applying spatial pattern lacquer layer to form mini lens array - Google Patents

Abstract

A method for producing image effect subject to viewing angle has the image printed onto a substrate and coated with lacquer and subjected to a raster type spatial pattern with forms mini lenses. The raster is applied using a UV activated lacquer and provides a cost effective process for large format images. The images can be applied online or off line.

Description

The The invention relates to a method and device for generating viewing-angle-dependent changeable Image effects on a substrate in a printing press after the preamble of claim 1 and 8 and 9. The viewing angle dependent variable Image effects are especially multi-dimensional image effects (2D or 3D effects) or image effects caused by the tilt effect.

It are known as lenticular images on printing materials, which dependent changeable from the viewing angle Have image effects. On the substrate is one from one or applied to several individual images composite printed image, where the substrate (with or without print image) with a lenticular sheet from a transparent or at least partially transparent plastic material is laminated as a cover layer. Lenticular films have lenticular Elevations with convex curved or cylindrical elevation structures (lenticular elements). According to the optical law of refraction, when viewed considering of refractive index and thickness of the lenticular sheet material as possible holistic picture without phase shifted sequences.

Usually become the so-called lenticular films in different resolutions and thus Also corresponding film thicknesses as a semi-finished product to the back Printing offered. The lenticular foil can thus even the Be printed by this back is printed or formed with or without back printing lenticular film can be combined with a substrate (with printed matter) by lamination be.

Such Films form a considerable one, especially for larger print formats Cost factor. Together with the format-dependent elaborate form preparation and the technically complex implementation thus arise more Costs. Furthermore, the printed matter must fit precisely on these slides be arranged or the slides must turn to fit be applied to the substrate. Once the relationship between Printed matter and / or printing material and the lenticular elements of Film is not register accurate, the 2D or 3D effect or the tilting effect disturbed or get lost.

For example DE 10 2004 037 825 A1 It is known to produce a security element for security papers, documents of value etc. with a transparent or translucent film having a surface relief in the form of a lenticular grid. The lenticular grid is created photolithographically or electron beam lithographically in a photoresist layer and transferred by means of a foil stamping process into an embossable foil (lenticular foil).

task The invention is a method and a device of the above called type to create the desired image effects in a manufacturing process on a substrate. Furthermore, it is a task Substrate with the desired To create image effects.

Is solved the task by the training features of claim 1 and 8 as well 9. Further developments emerge from the dependent claims.

One The first advantage of the invention lies in the fact that the processing process Offline or inline in a printing press, preferably with at least a coating unit, or in a printing press and a painting machine is feasible. Alternatively, the processing process may be in one first printing machine with at least one coating unit and then in realized a second printing machine with at least one coating unit become.

In a first training can the desired Image effects in a processing process in a printing press and then in a downstream coating machine or printing press with at least one coating unit who produces the or in a printing press, when printed in a first pass of the substrate and is painted in a second pass, are generated (offline method).

In a second education can the desired Image effects in a processing process in the inline process in a printing machine, preferably for multi-color printing with at least the primary colors cyan, magenta, yellow, as well as at least one coating unit, preferably for the paint job to be generated on a substrate.

By the respective offline or inline process process, the previously common application of Lenticular sheets on a substrate or the back Printing the lenticular sheets by one in a printing press be replaced on the substrate used printing / coating technology.

As a second advantage, it can be stated that the coating technology is noticeably less expensive than the application of lenticular films to the printing substrate and the production of the lenticular films. Due to the composition of the paint as well as by the paint technology when applied to the substrate can be special optical lens body on the substrate, in particular by a targeted influence of the mole generate kinetic forces at the interface and in the interior of the paint and / or by the interaction with paint accepting or repelling areas. Thus, compared to a lenticular film further, individual image effects can be achieved.

One third advantage is that the generation of the desired Image effects as full-surface effects or as a single spot effect or multiple spot effects on one Printing material is or is feasible. This is a more flexible Use of the substrates provided with individual image effects permitted, for example in packaging and advertising print jobs.

When fourth advantage may be mentioned that preferably before the paint application on the substrate a grid is generated, which point or linearly (Matrix) is formed. This grid is a dot or line grid Individually determinable, whereby the respective screening - related on a subject - as a unified or deviating grid may be formed. This is according to the following special optical lens bodies produced by the painting technology Image effects on the substrate achievable.

The Invention is intended to an embodiment be explained in more detail. Here are shown schematically:

1 a sheet-fed press in a row construction,

2 a substrate with image angle dependent on the viewing angle.

The sheet-fed press according to 1 consists of several, arranged in series printing units 1 , For multi-color printing are several, for example, four or six, of these printing units 1 , in particular offset printing, provided. The printing units 1 is known to be an investor (not shown) upstream. Each of these offset printing units 1 consists of one impression cylinder each 19 , the same time sheet guiding cylinder 9 is, depending on a plate cylinder carrying a printing plate 6 with assigned inking unit 7 (and if necessary with assigned dampening unit) and one blanket cylinder each 8th , The conveying direction 5 to be processed, sheet-shaped substrate 18 is shown with an arrow.

In the conveying direction 5 last printing unit 1 is at least a coating unit 2 downstream. Every coating unit 2 consists of an impression cylinder 19 , the same time sheet guiding cylinder 9 is, a form of a cylinder carrying a paint form 10 and a form cylinder 10 associated metering system 11 . 12 , The dosing system 11 . 12 is for example by a to the forme cylinder 10 adjustable / screened, screened applicator roller 11 and an associated chamber doctor 12 educated. Preference is given to the first coating unit 2 at least one further, preferably identical coating unit 2 in the conveying direction 5 downstream. For clarity, this machine configuration is not in 1 shown.

For the sheet transport are between the printing / coating plants 1 . 2 Sheet guiding cylinder 9 arranged as a transfer cylinder, which can also be designed as at least one sheet turning device in an operable in perfecting printing press. In conveying direction 5 is the last coating plant 2 a boom 3 with a revolving conveyor system 4 subordinate to the sheet storage. The printing units 1 as well as the coating plants 2 is after the nip (contact point of blanket cylinder 8th and impression cylinder 19 ) and the painting gap (contact point of form cylinder 10 and impression cylinder 19 ) one dryer each 13 the impression cylinder 19 arranged adjacent.

If necessary, between the last printing unit 1 and the first coating plant 2 and / or between two coating plants 2 additionally be arranged a dryer section. Such dryer sections are known, for example, from EP-A-1 502 739.

The sheet guiding cylinder 9 (including impression cylinder 19 ) are formed with double-sized diameter and thus have two circumferentially diametrically arranged sheet holding means, preferably gripper systems on.

The Sheet turning facilities can according to the principle of trailing edge use as a single-drum or three-drum turning accomplished be.

The printing works 1 are suitable for printing first color systems having radiation-curing or curing inks, as well as second color systems having oil-based colors, preferably offset inks.

With this device, the following process is realized: An in the investor provided sheet-shaped substrate 18 is recorded and in the conveying direction 5 the printing units 1 fed. In the printing units 1 is by means of the blanket cylinder 8th the respective color on the substrate 18 transferred so that on the substrate 18 by applying a color layer, a preferably multi-colored printed matter 14 is produced.

For radiation drying or curing inks (ink layer) of the printed matter 14 Kings These by means of the respective dryer device 13 dried or hardened before the substrate 18 the next printing unit 1 or coating unit 2 in the conveying direction 5 is supplied.

In the conveying direction 5 next printing unit 1 or the first, the printing units 1 downstream coating unit 2 will print on the subject 14 bearing substrate 18 at least a first layer as a basecoat layer 15 applied. If necessary, the basecoat can 15 in a further position, for example by means of a further printing / coating unit 2 on the substrate 18 be applied. The basecoat layer 15 can be applied as a full-surface coating or as Spotlackierung, preferably taking into account the Drucksujets. The basecoat film is preferred 15 transparent or at least partially transparent. Due to the layered structure or the layer thickness of the basecoat film 15 can the formation of the lens body 20 and their refractive properties are affected. The preferred layer thickness of the basecoat film 15 is about 10 to 30 microns. However, it is also a higher layer thickness of the basecoat film 15 realizable. For application of the basecoat film 15 For example, an oil-based varnish, a dispersion varnish or, preferably, an ultraviolet (UV) varnish may be used. Depending on the paint used in combination with the following applications, the gloss levels of the printed matter 14 as well as the image effects, for example divergent, influenced. The basecoat layer 15 is preferred by means of a dryer device 13 dried or hardened.

In another downstream printing unit 1 or coating unit 2 is then by means of the inked printing form or paint-wetted paint form (blanket cylinder 8th or form cylinder 10 ) a grid 17 ie a structure, as a further layer on the basecoat layer 15 applied. For this, the plate cylinder 6 of the printing unit 1 or the form cylinder 10 of the coating unit on a grid forming printing plate. The grid 17 can be with an ink or a varnish, preferably with a typical for offset printing ink system based on oil, he testifies. The grid 17 is on the substrate 18 designed as a special dot matrix or line grid (matrix). If necessary, the grid 17 by means of a dryer device 13 dried or cured.

Subsequently, in a downstream coating unit 2 on the exposed areas of the basecoat film 15 , ie not on the grid 17 hidden spots, a paint 16 , preferably a UV varnish, applied in at least one layer as a lenticular functional layer. The grid 17 has the paint 16 repulsive properties (drip-off principle). The paint 16 forms between the grid points or grid lines individual lens body 20 out through the grid walls 21 are limited by point or line grid. The lens body 20 can be a cylindrical or as in 2 shown to have a convex lens contour. The training of the lens body 20 is next to the grid walls 21 can be influenced by a targeted influencing of the molecular forces at the interface and in the interior of the paint and / or by the interaction with paint accepting or repelling areas. Following the application of the paint 16 is the sheet-shaped substrate by means of a dryer 13 dried or hardened.

If necessary, in at least one other coating unit 2 at least a second layer of the paint 16 on the lens body formed by the first layer 20 be applied. The second and each additional layer of the paint 16 is each dried or cured.

In summary, a device for generating viewing-angle-dependent changeable image effects on a printing substrate in a printing press, wherein the image effects can be achieved by a lenticular cover layer arranged on the printing substrate, is constructed as follows. The printing press is in the conveying direction 5 a printing material from printing units 1 formed for multicolor printing. A printing unit 1 or one of the printing units 1 after ordered coating unit 2 is for applying a base coat layer 15 on the substrate 18 arranged.

The basecoat layer 15 generating printing or coating unit 1 ; 2 is a white printing or coating plant 1 ; 2 for creating a grid 17 on the basecoat layer 15 in the conveying direction 5 sorted by. For this, the plate cylinder 6 of the printing unit 1 or the form cylinder 10 of the coating plant 2 one the grid 17 forming printing form. The printing or coating plant 1 . 2 for the order of the grid 17 on the substrate 18 is another coating plant 2 for applying a paint 16 , Especially for the formation of a lenticular cover layer, on the substrate 18 downstream. The lacquer gap of this coating unit 2 is one on the substrate 18 located paint 16 drying or curing drying device 13 downstream.

The printing material with image effects which can be changed depending on the viewing angle, wherein the image effects can be achieved by means of a lenticular layer arranged on the printing substrate, is characterized as follows. On the substrate 18 is a Drucksujet as a color layer, preferably generated in multi-color printing arranged. On the substrate 18 is as a spot or full surface a basecoat layer 15 is arranged. On the basecoat 15 is a grid 17 with a paint still to be applied 16 repulsive properties assigns. On the exposed areas of the basecoat 15 is a paint 16 arranged as a lenticular functional layer, wherein the lens body 20 the lenticular functional layer in the region of its edge angle α of the grid 17 , especially its grid walls 21 , edged. The lens body 20 stand over the grid walls 21 sublime.

1

printing unit

2

coating unit

3

boom

4

conveyor system

5

conveying direction

6

plate cylinder

7

inking

8th

Blanket cylinder

9

Sheet guiding cylinder

10

form cylinder

11

applicator roll

12

chambered doctor blade

13

drying device

14

print motif

15

Basecoat

16

paint

17

grid

18

substrate

19

Impression cylinder

20

lens body

21

Rasterwandung

α

contact angle

Claims (9)

Method for generating image effects which can be changed as a function of viewing angle onto a printing substrate in a printing machine, wherein the image effects are achieved by a lenticular layer arranged on the printing substrate, characterized in that a printed matter is produced by applying a colored layer to the printing material, then as spot or a basecoat film is applied over at least one layer in at least one layer, then a grid repellent to the basecoat film is applied and then a paint is applied substantially to the exposed areas of the basecoat film as a lenticular functional film, and then the paint is dried or cured , Method according to claim 1, characterized in that that the ink layer of the Druckuujets dried or cured. Method according to claim 1, characterized in that the basecoat layer is dried or cured. Method according to claim 1, characterized in that that the grid is dried or cured. Method according to claim 1, characterized in that that the basecoat film is produced by means of a UV varnish. Method according to claim 1, characterized in that that the grid by means of a for The offset printing typical oil-based paint system is generated. Method according to claim 1, characterized in that that the paint is produced by means of a UV varnish. Device for generating image effects which can be changed as a function of the viewing angle onto a printing substrate in a printing machine, the image effects being achievable by means of a lenticular layer arranged on the printing substrate, characterized in that the printing press is arranged in the conveying direction (FIG. 5 ) of a printing material from printing units ( 1 ) for multicolor printing is that a printing unit ( 1 ) or the printing units ( 1 ) by ordered coating unit ( 2 ) for applying a basecoat film ( 15 ) on the substrate ( 18 ) is arranged such that the basecoat ( 15 ) generating printing or coating unit ( 1 ; 2 ) another printing or coating unit ( 1 ; 2 ) for generating a grid ( 17 ) on the basecoat ( 15 ) is ordered by, wherein the plate cylinder ( 6 ) of the printing unit ( 1 ) or the form cylinder ( 10 ) of the coating unit ( 2 ) a grid ( 17 ) forming printing form that the printing or coating unit ( 1 . 2 ) another coating unit ( 2 ) for applying a paint ( 16 ) on the substrate ( 18 ) is ordered by and that the lacquer gap of the coating unit ( 2 ) one on the substrate ( 18 ) paint ( 16 ) drying or curing drying device ( 13 ) is subordinate. Printing substrate with image effects which can be changed depending on the viewing angle, wherein the image effects can be achieved by means of a lenticular layer arranged on the printing substrate, characterized in that on the printing substrate ( 18 ) a Drucksujet is arranged as a color layer that on the substrate ( 18 ) as a spot or all over a basecoat layer ( 15 ) is arranged on the basecoat ( 15 ) a grid ( 17 ) with a varnish ( 16 ) repellent properties is arranged on the exposed areas of the basecoat ( 15 ) a paint ( 16 ) is arranged as a lenticular functional layer, wherein the lens body ( 20 ) of the lenticular functional layer in the region of its contact angle (α) from the grid ( 17 ) are.