WO2009006749A1 - Dispositif d'impression - Google Patents

Dispositif d'impression Download PDF

Info

Publication number
WO2009006749A1
WO2009006749A1 PCT/CH2008/000307 CH2008000307W WO2009006749A1 WO 2009006749 A1 WO2009006749 A1 WO 2009006749A1 CH 2008000307 W CH2008000307 W CH 2008000307W WO 2009006749 A1 WO2009006749 A1 WO 2009006749A1
Authority
WO
WIPO (PCT)
Prior art keywords
printing
information
substrate
surface structure
printing device
Prior art date
Application number
PCT/CH2008/000307
Other languages
German (de)
English (en)
Inventor
René Hauser
Wolfgang Bock
Original Assignee
3D Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3D Ag filed Critical 3D Ag
Priority to EP08757299.6A priority Critical patent/EP2167317B1/fr
Priority to AU2008274799A priority patent/AU2008274799A1/en
Publication of WO2009006749A1 publication Critical patent/WO2009006749A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F11/00—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination
    • B41F11/02—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination for securities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D15/00—Printed matter of special format or style not otherwise provided for

Definitions

  • the invention relates to a printing device with a printing for transferring optically perceptible information on a medium to be printed by means of a
  • Printing Fluids such as a printing ink, wherein a pressure surface of the
  • Printing form has a first structure, the predetermined transmission of the
  • Printing fluid is determined on a printing substrate, and the first structure of this
  • printing methods From the field of reproduction technology a variety of printing methods are known. All of these printing methods share the goal of duplicating visually perceptible information.
  • optically directly perceptible information is to be generated, that is to say such information which can be recognized and evaluated by a viewer with the naked eye, ie without the aid of a device such as a microscope or an imaging sensor.
  • information may be data in written form or graphic illustrations.
  • a printing plate is always used, are transmitted with the predetermined information on the medium to be printed, such as paper or cardboard.
  • the printing form contains the information in identical or laterally reversed form. The information is transmitted from the printing form by means of the printing ink on the medium to be printed and displayed.
  • printing methods which are known per se, are known, for example, as gravure printing, letterpress, planographic printing, throughprinting (screen printing), photoprinting, etc. Furthermore, the printing methods are distinguished according to whether the information is transmitted directly from the printing form to the medium to be printed or indirectly via an intermediate carrier to the medium to be printed. Examples of indirect printing methods in which the printing medium is first delivered from the printing form to the intermediate carrier and then from the intermediate carrier to the medium to be printed, are the flexographic printing or the gravure printing. All of these printing methods mentioned in a non-exhaustive list are suitable for the present invention. In many fields of technology, diffractive structures are used, ie structures which generate diffraction effects when light incidence of at least certain light frequencies occurs.
  • Such structures are intended for a wide variety of purposes, in particular as decorative elements or as security elements.
  • decorative elements they are to achieve pleasing optical effects, for example as packaging films or as product labels with which the attention of customers can be directed to the corresponding products provided with such a decorative element.
  • security elements that are visible or invisible to the naked eye, they are intended to guarantee the authenticity of products, funds, substitutes, credit cards, and the like, because of their forgery potential, which is only possible with very high technical effort.
  • grating structures with lattice spacings in the range of about 200 nm to 1500 nm are required.
  • Such diffractive active structures are generally produced in industrial mass production by first producing so-called master shims with the assistance of photolithographic or laser interferometric methods. From the master shims production shims are then prepared by means of galvanic processes, with which the lattice structures in suitable substrates, such as hot stamping foils, are impressed.
  • the hot stamping foils can be designed, for example, as labels so that the diffraction-optically effective pattern can be applied to any desired backing.
  • microfills or guilloches are also known, which are provided as a security feature, for example microfills or guilloches.
  • the surface structures required to produce microfills and guilloches are at least 10 times larger than the longest wavelength in the visible light spectrum. This facilitates the production of such structures.
  • the required high cost can be considered disadvantageous if a substrate is to be both printed with information and provided with a security feature.
  • such processes can not satisfy the limited variability and flexibility in color design. In order to have a certain design appear in certain (primary color) colors, it is necessary to stock films with these colors.
  • the applicability of the prior art methods is essentially limited to those substrates in the surface of which a lattice structure can be imprinted.
  • the invention is therefore based on the object to provide a way by which even the latter regardless of the embossability of a substrate with the greatest possible flexibility in the color selection can be provided with a security element or a decorative element based on the smallest surface structures, in particular diffractive acting structures.
  • the printing surface - in addition to a first surface structure for the transmission of a first optically perceptible information - has a second surface structure, at least partially disposed in the region of the pressure surface in which the first surface structure wherein the structuring of the second surface structure is smaller or more finely structured than the structuring of the first surface structure and the second surface structure contains perceptible / detectable information or perceptible / detectable information can be generated with the second surface structure.
  • the object is also achieved by a method according to claim 15 and by a printed substrate according to claim 12.
  • the invention thus provides for a multi-scale structuring of the printing surface which, in addition to larger structures, also includes these superposed smallest structures with predetermined geometrical properties.
  • the second, smaller and thus finer surface structure may be suitable for use in conjunction with security elements and be produced on a substrate by printing with advantage.
  • the second structure should be arranged at least partially in those areas of the printing surface, in which also the first structure located.
  • these second structures may be contained in the surfaces of the printing medium, ie in the visible side of the finished printed substrate. Since it is generally the aim in conventional printing processes to obtain surfaces which are as smooth as possible, the invention provides for a measure which is diametrically opposed to the prior art. This does not change the fact that there are processes that include printing, but try to create a surface structure by embossing.
  • This prior art surface structure which differs from the surface structure according to the invention, is achieved in that the substrate to be printed is itself plastically deformed.
  • the first surface structure preferably generates optical information at least substantially without diffraction effects, the content of which is preferably detectable with the naked eye directly or only by automatic text recognition (OCR) or image processing.
  • OCR automatic text recognition
  • the information reproduced by the second surface structure in particular its shape and color (s), can be detected or interpreted either by the naked eye or by machine.
  • Said diffractive second surface structure is advantageously produced on the substrate by means of a printing process, ie an application in which a printing medium, in particular a printing ink, is applied to a printable substrate. It is here - as in other embodiments of the invention - preferred that simultaneously with the application of the second surface structure having the said microstructures, there on the same surface portion of the substrate to be printed there also the optically perceptible first information is applied differs from the second information, but is preferably at least partially superimposed.
  • the visually perceivable information of the first surface structure may be, for example, a relief, areas or lines that reproduce the perceptible information without optical diffraction.
  • the optically perceivable information of the second surface structure preferably uses the effect of diffracting optically, in particular, different diffraction orders of light to reproduce the optical information contained therein.
  • the latter can, for example various color effects and / or a tilt angle dependent reproduction of characters, graphics and the like included.
  • a particularly advantageous embodiment of the invention provides that the first and the second surface structure contained in a single printing form and are superimposed or combined. In contrast to other solutions, this ensures that the two pieces of information from the first and second surface structure are always precisely matched. This is true even if the substrate should warp during the printing process. Furthermore, with this embodiment according to the invention with only one printing plate, the entire printing can be carried out, which, despite the technically demanding, preferably diffractive, surface structure and in particular despite the accurate arrangement of the two information, keeps the expenditure in connection with the printing process within limits.
  • the second structure is provided for generating a perceptible with the naked eye and / or machine-readable information.
  • embossed, very fine barcodes can be understood, which are perceived both with the naked eye as a diffraction effect, as well as contain a machine-readable information.
  • the information of the first structure should remain perceptible to the naked eye without significant interference.
  • the first information is a text printed with the first structure, then it should remain readable, although in its surface, for example, barcodes can be imprinted, which can be perceived as well as machine-readable both with the naked eye, for example as a color-changing pattern.
  • a reading device known per se can preferably be guided over the printed substrate, wherein the reading device reads out the information of the second surface structure printed on the substrate preferably using printing inks.
  • an electrically conductive and ultraviolet radiation curable printing fluid from Conductive Ink Technology, Cambridge, is used.
  • This will eg a line of eg 1 mm width and 50, for example mm length printed, which is visible to the naked eye and forms a first inventive pattern.
  • This pattern has on its surface as a second pattern a one-dimensional barcode whose strip is formed by rectangular pits of different widths, the width of these pits being for example either 300 nm or 600 nm, and wherein the pits are, for example, 1 mm long and perpendicular to long axis projecting first pattern, and wherein the center of two successive wells has a constant distance of, for example 1200 nm.
  • Such a barcode can be read out with a capacitive read head, as presented by JVC for reading out capacitive picture plates, the capacitor used here having a gap of, for example, 200 nm width, which detects the depressions.
  • the above first pattern is illuminated with a collimated laser beam, which diffracted by the second pattern described above in different angles - depending on the decency of the above barcode strip. It is conceivable that the first pattern was realized with a magnetic pressure fluid, so that the protruding strips are readable by a miniaturized read head.
  • auxiliary means are machine-readable barcode-like codings, e.g. the "Glyphs" proposed by Xerox Corporation for the Encoding of Paper Documents Insofar as such tools are required or even helpful, the corresponding printing device, the printed substrate, and the tools as a whole or parts thereof may be designed as a coordinated information system according to the invention.
  • the printing device provided for producing substrates printed according to the invention with optically perceptible information of the aforementioned second type can have a diffractive structure at least in a partial region of its surface exhibit.
  • the latter is preferably arranged in an area or at the same location, which is also provided for receiving (loading) pressure medium.
  • This at least one area should also serve to transfer non-diffractive optical information to the substrate.
  • the non-diffractive optical information may result from the printing medium, in particular from its color (s) and geometric shape (s).
  • the additional optical information due to the diffractive effect results from the permanently applied to the printing medium, in particular imaged on her, grid structure. Since the surface of the printing medium provided with the diffractive structure forms a visible side of the printing medium applied to the substrate, both optical information can be perceived after the printing process.
  • the invention makes it possible to produce such structures quickly and inexpensively. This is especially true when the diffractive structure is transformed into a non-diffractive optical
  • any printing method can be used in connection with the present invention in which a printing plate, for example in the manner of a printing plate, is used for printing with a printing medium, on the surface of which a grating structure having an optical diffraction effect or another predetermined superfine structure can be applied.
  • the ink should wet all the structures of the printing surface of the printing plate and permanently retained after the impression on the substrate to be printed on its inherited from the printing surface structuring.
  • Such a printing process is, for example, the gravure printing process and the high-pressure process, in particular flexographic printing. Even with the latter, it is expedient if the ink cures at least partially in the printing line.
  • the second structure in particular a diffractive second structure, may in particular include a security feature that is used to identify or to prove the authenticity of a product, payment means and the like.
  • the printed security feature can here be visible to the naked eye or be designed as a hidden feature that can only be detected with the aid of technical aids, such as microscopes or profilometers.
  • Fig. 1 is a perspective view of a erfindungsgemächer ⁇
  • Fig. 2 shows an embodiment of a printed substrate produced with the printing device of Fig. 1;
  • Fig. 3 is a partial cross-sectional view of an inventive
  • Printing device in the region of a first and superimposed second surface structure
  • Fig. 4 is a further partial cross-sectional view of an inventive
  • Printing device in the region of a first and superimposed second surface structure.
  • the purely schematically shown in Fig. 1 according to the invention printing device comprises a cylinder 1 of a gravure device whose surface - except for a part of the cylinder surface engaging pressure pattern - is smooth-surfaced and thus can be referred to as a smooth surface.
  • the surface or the cylinder is preferably elastic.
  • the rectangular printing pattern 4, which can be seen and evaluated by the naked eye, corresponds to a first optical information, for example, the rectangle shown in Fig. 1.
  • the printing pattern has a multiplicity of smallest images which are introduced in the region of the printing pattern 4 on the surface of the cylinder 1 as recesses.
  • Such surface structures are already known per se, and can-as they usually have size dimensions in the direction parallel to the directions of extension of the surface in the range of 10 ⁇ m to 150 ⁇ m-be referred to as micrometer-scale.
  • Such recordings of the printing form are often referred to in screened gravure as wells.
  • these images are usually executed as a graphic element, for example as a whole, one-to-one printable letters or lines.
  • This second surface structure can therefore as "nanometer scale
  • the term "second surface structure” should also be understood to mean higher and lower elements whose height differences may be in the range of 5 ⁇ m to 50 nm.
  • the lattice structures of a single or, preferably, multiple shots 2 may provide perceptible information, such as readable characters such as letters or numbers, a graphic, and the like.
  • Fig. 3 and in Fig. 4 are cross sections of a part of a printing plate, such as the printing cylinder 1 shown in FIG. 1.
  • the section shown Fig. 3 shows a receptacle 2 in the printing surface of the printing form, which is part of the first surface structure.
  • the receptacle 2 may be part of a gravure relief which is introduced in the printing surface and may be in the form of gravure printing cups.
  • the surface of the receptacle 2 is not smooth-surfaced but is provided with its own predetermined surface structure 3 essentially over its entire recording surface. This microstructure of the second surface structure is thus provided within the gravure relief.
  • the second surface structure 3 is provided as an effective diffractive optical or active structure, in particular, a frequency from a range of 20 lines / mm to 3000 lines / mm, preferably from 800 lines / mm to 2000 lines / mm, may have, with the height differences These structures preferably less than or equal to 2 microns, preferably less than or equal to 1 micron, and more preferably from a range between 200 nm and 600 nm, amount.
  • the surface structure may be formed as a continuous or diskuntinierliche linear grid or cross lattice structure.
  • Such nanometer-scale structures can be produced using different production methods, for example by holographic intereferometric lithography, in particular laser interferometry, e-beam lithography and / or by photolithographic methods.
  • FIG. 4 schematically shows a further possible embodiment of the first and second surface structures.
  • the first surface structure in its printing surface both a gravure relief (recording 2) and a high-pressure relief 9, which may be incorporated by engraving in the printing surface.
  • Both the recessed structures and the raised structures are provided on their surface with second surface structures 3, which in turn are active diffraction optically due to their predetermined structuring.
  • areas between the images may also be provided with a nanometer-scale surface structure (3).
  • the individual sections of the surface structured in this way yield one or more additional perceptible information.
  • This additional perceptible optical information can either be one of the information described above, completely separate, further information or supplement this information.
  • the further information is additional independent information, namely a diffractive barcode designed as an additional security element. This or its information can be detected by machine, for example by a reading device, which preferably automatically checks whether certain properties are present in the security feature.
  • the second optical information is superimposed on the first optical information, the rectangle of the embodiment.
  • the smooth surface of the printing cylinder i.e., the surface of the printing cylinder which lies outside the photographs
  • the second structure of the printing surface - is in this case such that a gravure doctor can slide on the printing surface.
  • the printing surface and its structures can also be designed so that they are suitable for printing and possibly associated embossing operations.
  • FIG. 2 likewise shows in highly schematic form a substrate 8 printed with the printing device from FIG. 1, for example formed from a polymer film.
  • This has a preferably multi-colored, first optically perceptible information which has been produced by printing a number of shots 2, wherein in Fig. 2, only a single shot is shown.
  • a nanoscale pattern 7 is imprinted as a second optical information by printing.
  • the printing device of FIG. 1 is used with a printing method according to the invention, which can take place as follows:
  • the printing cylinder 1 is provided in an ink fountain with paint, which is preferably scraped off; - The substrate is passed between 1 and a further, not shown, so-called. Presseurzylinder, wherein the press cylinder presses the substrate along the print line on the printing cylinder;
  • press cylinder and / or printing cylinder 1 are made transparent, so that UV light from the inside of the cylinder through their surfaces in the
  • Printing line can be irradiated, whereby a partial curing of the color is effected. This facilitates detachment of the ink from the printing form while maintaining the impression of the second surface structuring in the printing ink.
  • the ink used may be an ultraviolet-curable formulation provided with photoinitiators.
  • the second surface structure is imaged in the printing ink of the printed substrate and is permanently contained in it due to the curing effect which prevents it from flowing away.
  • a nanoscale structure may preferably also be incorporated in the smooth surface of FIG. 2, as shown in FIG. Such a structure is also printed on the substrate 8 according to the above method.
  • the surface structure of the printing device can be generated by selectively removing the printing plate provided with the first structure; but it can also be additive by the printing plate is provided with a soft stamp with the second structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

Le dispositif d'impression décrit comprend une forme d'impression pour le transfert d'une information visible de manière optique sur un support d'impression au moyen d'un fluide d'impression, comme par exemple une encre d'impression. Une surface d'impression de la forme d'impression présente une première structure servant au transfert prédéterminé du fluide d'impression sur un substrat d'impression, cette première structure permettant, dans le cas présent, de transférer une première information visible de manière optique sur le substrat d'impression. Ce dispositif offre la possibilité, indépendamment de l'aptitude à l'estampage du substrat susmentionné, d'être équipé, avec un maximum de flexibilité dans le choix des couleurs, d'un élément de sécurité ou d'un élément décoratif reposant sur des structures de surface extrêmement petites. A cet effet, l'invention propose d'agencer une seconde structure de la surface d'impression dans la zone de la première structure, la structuration de la seconde structure de surface étant plus petite que la structuration de la première structure de surface et la seconde structure de surface comportant une information visible ou une information visible pouvant être générée avec la seconde structure de surface.
PCT/CH2008/000307 2007-07-09 2008-07-09 Dispositif d'impression WO2009006749A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08757299.6A EP2167317B1 (fr) 2007-07-09 2008-07-09 Dispositif d'impression
AU2008274799A AU2008274799A1 (en) 2007-07-09 2008-07-09 Printing device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH11072007 2007-07-09
CH1107/07 2007-07-09

Publications (1)

Publication Number Publication Date
WO2009006749A1 true WO2009006749A1 (fr) 2009-01-15

Family

ID=39092844

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2008/000307 WO2009006749A1 (fr) 2007-07-09 2008-07-09 Dispositif d'impression

Country Status (3)

Country Link
EP (1) EP2167317B1 (fr)
AU (1) AU2008274799A1 (fr)
WO (1) WO2009006749A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018191827A1 (fr) * 2017-04-18 2018-10-25 Orell Füssli Sicherheitsdruck Ag Document de sécurité pourvu d'une fenêtre et d'une structure réfractive

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845436A1 (de) * 1998-10-02 2000-04-06 Giesecke & Devrient Gmbh Stichtiefdruckverfahren zum Drucken von aneinander grenzenden Farbflächen unterschiedlicher Farbschichtdicke
WO2001072525A1 (fr) * 2000-03-28 2001-10-04 Giesecke & Devrient Gmbh Support de donnees imprime par heliogravure
WO2002020279A1 (fr) * 2000-09-08 2002-03-14 Giesecke & Devrient Gmbh Plaque d'heliogravure et document de valeur produit avec celle-ci
WO2003052702A2 (fr) * 2001-12-17 2003-06-26 Giesecke & Devrient Gmbh Document de valeur
WO2003057494A1 (fr) 2002-01-11 2003-07-17 Giesecke & Devrient Gmbh Procede d'heliogravure acier d'un document de securite et plaque d'heliogravure en acier et demi-produits utilises et leur procede de production
WO2005070693A1 (fr) * 2004-01-21 2005-08-04 De La Rue International Limited Dispositif de securite

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845436A1 (de) * 1998-10-02 2000-04-06 Giesecke & Devrient Gmbh Stichtiefdruckverfahren zum Drucken von aneinander grenzenden Farbflächen unterschiedlicher Farbschichtdicke
WO2001072525A1 (fr) * 2000-03-28 2001-10-04 Giesecke & Devrient Gmbh Support de donnees imprime par heliogravure
WO2002020279A1 (fr) * 2000-09-08 2002-03-14 Giesecke & Devrient Gmbh Plaque d'heliogravure et document de valeur produit avec celle-ci
WO2003052702A2 (fr) * 2001-12-17 2003-06-26 Giesecke & Devrient Gmbh Document de valeur
WO2003057494A1 (fr) 2002-01-11 2003-07-17 Giesecke & Devrient Gmbh Procede d'heliogravure acier d'un document de securite et plaque d'heliogravure en acier et demi-produits utilises et leur procede de production
WO2005070693A1 (fr) * 2004-01-21 2005-08-04 De La Rue International Limited Dispositif de securite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018191827A1 (fr) * 2017-04-18 2018-10-25 Orell Füssli Sicherheitsdruck Ag Document de sécurité pourvu d'une fenêtre et d'une structure réfractive

Also Published As

Publication number Publication date
EP2167317B1 (fr) 2014-09-17
AU2008274799A1 (en) 2009-01-15
EP2167317A1 (fr) 2010-03-31

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