DE102004059305A1 - Engravings in gravure cylinders - Google Patents

Abstract

The invention relates to a method for producing tactile print images in an endless gravure printing method, wherein an image template is detected by means of a scanner, converted into a data file and by means of an exposure method, a laser engraving method, an electron beam engraving method, a DC-modulated diamond engraving method, a laser ablation method or directly on an endless gravure cylinder is transferred, endless Intagliostrukturen are generated, followed by the printing of a substrate with a paint or a varnish in the gravure printing process.

Description

The The invention relates to a method for producing a rotary Gravure printing form for endless printing on substrates.

in the rotative gravure printing processes are the objects to be printed, lines, Pictures, letters, logos and the like by making recesses (engraving), usually in endless gravure cylinders, generated, the wells by Webs are separated.

These Wells are then with the color to be printed or the filled with varnish to be printed. On the surface Excess color left or excess paint are usually removed with the help of a squeegee. The to be printed Substrate is then using the press cylinder to the gravure cylinder Pressed and transferred so the color or the paint on the substrate. Depending on the depth of the recesses, the value transferred to the substrate varies Ink layer thickness. With the help of an electrostatic printing aid can still a better emptying behavior can be achieved.

ever according to used color one then depending brighter from the respective ink layer thickness and the size of the wells or darker shades.

in the rotary gravure printing techniques have been tactile, i. tactile print images not produceable.

task The invention was therefore a method for producing tactile To provide print images in rotative gravure, the image of the Print image in continuous printing.

object The invention is therefore a method for producing tactile printed images in an endless gravure printing process, characterized in that captured the image template by means of a scanner, into a data file and using an exposure method, a Laser engraving process, an electron beam engraving process, a DC-modulated diamond engraving, one Laser ablation process or transferred directly to an endless gravure cylinder becomes, whereby endless Intagliostrukturen be produced, whereupon the Printing a substrate with a paint or a varnish done by gravure printing.

One Another subject of the invention are articles, such as packaging, Value documents, data carriers, which have a tactile print image.

Under Value documents and data carriers for example, banknotes, vouchers, tickets, tickets, identity documents, Maps and the like understood.

to Production of the intaglio printing tool according to the invention Preferably, a method is used in which a corresponding Cylinder with the help of laser or electron beam technology accordingly the desired on the substrate Patterns, images, lines, letters, shapes and the like Shapes are illustrated or directly structured.

When Image template is used, for example, a graphic drawing or the like. To make this graphic drawing is a picture template, For example, a photo and the like in a hand-modulated Converted line grid.

This Image (line grid) is then scanned and a corresponding Data file generated.

For this For example, the corresponding image will be an 8 bit grayscale image over corresponding detection device, For example, a scanner such as an EBV scanner, such as an EBV scanner. Bright Graphics Systems S3300 into an electronic image processing program such as. Bright Linocolor or Adobe Photoshop read.

The but corresponding grayscale image can also be electronically suitable software, e.g. Adobe Illustrator, Corel Draw, Freehand etc. are created.

The desired Grayscale image will follow in a suitable software program, for example in Barco Fortuna, with the corresponding geometric shapes, e.g. Gulliochen, Sinus-Waves, Stripes, etc. connected. about the lineweight function provided by the appropriate software, e.g. Variable Linewith Generator now becomes the graphical element dependent on of the gray level value.

The image produced in this way is now exposed to a prepared cylinder in a corresponding exposure system, for example. For example, with the aid of a laser or electron beam on the cylinder, for example, a gravure cylinder with a core of iron tube with wall thickness 20 mm, and the following layers: 5-7 microns nickel layer, 300 microns copper layer; existing photosensitive layer with the corresponding patterns, shapes, lines, letters in the form of the previously defined grid imaged, developed and etched.

The Coating of the cylinder takes place in the usual way with a plastic transfer wheel, or by spraying, Rolling, brushing, dipping, or by means of a curtain application process, preferably in a layer thickness of 2-10 microns with a commercial Photosensitive composition, for example, LD 100, OHKA Kogyo Ltd.

It but are also all other known and commercially available Compositions suitable. Then the cylinder is with an overcoat provided with a layer thickness of 1-5 microns, for example with OC-40 (OHKA Kogyo Ltd) or similar analog commercial Composition.

The Development takes place after exposure in the usual way, for example Contactless with sodium carbonate (0.5% solution), it usually closes a cleaning process with water, whereupon the cylinder dried becomes.

Subsequent conventional etching process following the laser beam imaging reflects the image, patterns, shapes and the like defined by the laser beam imaging on the surface of the cylinder. The etching can be carried out in various ways, for example by means of a Fe (III) chloride solution or a Cu (II) chloride solution, if appropriate with the addition of HCl or H ₂ SO ₄ . If appropriate, commercially available and known additives for flank protection can also be added to the etching solution.

The thus generated endless intagliostructures can depending on the etching time a depth of 15 to 250 microns exhibit.

The Duration of exposure of the etchant depends on from the used etchant and is for example when using a Cu-chloride solution with the addition of an acid about 90-2400 sec.

It however, an electrochemical etching process can also be used.

Of the Cylinder looks blunt after the etching process and visually dark. Through a surface treatment with electrolytic or chemical shining can improve the impression structure and produce a brilliant print quality become.

Further Is it possible with a laser engraving process or electron beam engraving process, For example, after the Hell or Datwyler method, the picture directly into the surface of the cylinder, for example made of copper, zinc, plastic, etc., too engraving.

Furthermore, the image can also be through a direct voltage modulated Diamantstichelgravurverfahren (eg Transcribe ^®, Ohio), or laser ablation (eg Schepers) with subsequent etching, are transmitted to the cylinder.

in the Gravure printing is then the substrate with the tactile print image Mistake.

When Substrates are for example carrier films, preferably flexible transparent plastic films, for example of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS, PVC in question.

The carrier films preferably have a thickness of 5-700 microns, preferably 5-200 microns, especially preferably 5-50 μm.

Further can as printing material also metal foils, for example Al, Cu, Sn, Ni, Fe or stainless steel foils with a thickness of 5-200 microns, preferably 10 to 80 μm, particularly preferably 20-50 microns serve. The slides can also surface treated, coated or laminated, for example, with plastics or be painted.

Furthermore, paper or composites with paper, for example composites with plastics having a weight per unit area of 20-500 g / m ² , preferably 40-200 g / m ^2, may also be used as printing material. be used.

Further, as substrates or nonwovens, such as continuous fiber webs, staple fiber webs and the like, which may optionally be needled and / or calendered, can be used as printing materials. Preferably such fabrics or webs of plastics, such as PP, PET, PA, PPS and the like, but it can also be woven or nonwovens made of natural, optionally treated fibers, such as viscose fibers are used. The nonwovens or fabrics used have a weight per unit area of about 20 g / m ² to 500 g / m ² . If necessary, the nonwovens or fabrics must be surface-treated.

To the Can print usual colors and lacquers are used, which also have functional properties, For example, optical, electrically conductive, magnetic or adhesive properties can have.

But there may also be special intaglio or Offset printing inks are used.

to Adjustment of electrical properties, such as conductivity, can for example graphite, soot, conductive organic or inorganic polymers, metal pigments (for example Copper, aluminum, silver, gold, iron, chromium and the like), Metal alloys such as copper-zinc or copper-aluminum or else amorphous or crystalline ceramic pigments such as ITO, FTO, ATO and may be added. Furthermore, also doped or not doped semiconductors such as silicon, germanium, gallium arsenide, Arsenic or ionic conductors such as amorphous or crystalline metal oxides or metal sulfides are used as an additive. Furthermore, the Setting the electrical properties of the layer polar or partially polar compounds such as surfactants, or non-polar compounds such as silicone additives or hygroscopic or non-hygroscopic Salts are used or added. Similarly, intrinsically conductive organic Polymers such as polyaniline, polyacetylene, polyethylenedioxythiophene and / or polystyrene sulfonate and derivatives thereof. These polymers over the entire surface or partially, in the form of lines and the like then to Reinforcement of electrical properties are applied.

to Adjustment of magnetic properties can be paramagnetic, diamagnetic and also ferromagnetic materials, such as iron, nickel, barium, and cobalt or their compounds or salts (for example, oxides or sulfides) be used. Particularly suitable are Fe (II) and Fe (III) oxides, Barium or cobalt ferrites, rare earths and the like.

The optical properties of the layer can be visualized by Colors or pigments, luminescent dyes or pigments, which fluoresce in the visible, in the UV range or in the IR range or phosphoresce, heat-sensitive Colors or pigments, effect pigments, such as liquid crystals, pearlescent, Influence bronzes and / or multilayer color change pigments. These are in all possible Combinations used.

Further can Hot- or cold sealing varnishes may be applied which may be pigmented can.

The tactile print images can optionally also simultaneously the function of a spacer to improve the separability of the tactile print images provided printing materials (for example, in packaging lids and the like).

Of the thus produced printing material is directly or optionally after appropriate confectioning therefore as a security feature in Media, in particular value documents such as identity cards, cards, banknotes or Labels, seals and the like suitable, but also as packaging material for example in the pharmaceutical, electronics and / or food industry, for example in the form of blister foils, cartons, covers, Foil packaging and the like suitable.

For the application As security features, the printing substrate may preferably be in strips or threads or patches are cut, with the width of the strips or Threads preferably 0.05-20 mm may be and the patches preferably medium widths or lengths from 0.3-20 mm.

For the application in or on packaging, the printing material is optionally preferred in Stripes, ribbons, Threads or Patches cut, the width of the threads, strips or bands preferably 0.05-50 mm is and the patches preferably average widths and / or lengths of 0.5-200 mm exhibit.

For the use as a cover for Become a container appropriate forms punched or cut from the substrate.

Claims (7)

A method for producing tactile print images in an endless gravure printing method, characterized in that the image original is detected by means of a scanner, converted into a data file and by means of an exposure method, a laser engraving method, an electron beam engraving method, a DC modulated diamond engraving method, a laser ablation method, or directly to an endless Gravure cylinder is transferred to endless intagliostructures are generated, followed by the printing of a substrate with a paint or a varnish in the gravure printing process. Method according to claim 1, characterized in that the image template is made by converting an image in a hand-modulated line grid. Method according to one of claims 1 or 2, characterized that the depth of the fabricated endless intagliostructures 15 up to 250 μm is. Method according to one of claims 1 to 3, characterized that as inks paints and varnishes with optical, electrical conductive or magnetic properties are used. Method according to one of claims 1 to 4, characterized that intaglio or offset inks are used as printing inks become. Articles, such as packaging, documents of value and data carriers, thereby in that it is one according to one of the methods of claims 1 to 5 have produced tactile printed image. Articles, such as packaging, documents of value and data carriers, thereby characterized in that it is a security element as a security element, the one by a method according to a the claims 1 to 5 produced tactile printed image.