EP1874487A1 - Verfahren zur erzeugung von farbeffektbildern - Google Patents
Verfahren zur erzeugung von farbeffektbildernInfo
- Publication number
- EP1874487A1 EP1874487A1 EP06724571A EP06724571A EP1874487A1 EP 1874487 A1 EP1874487 A1 EP 1874487A1 EP 06724571 A EP06724571 A EP 06724571A EP 06724571 A EP06724571 A EP 06724571A EP 1874487 A1 EP1874487 A1 EP 1874487A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- color effect
- pixels
- carrier substrate
- image
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 230000000694 effects Effects 0.000 title claims abstract description 197
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000005291 magnetic effect Effects 0.000 claims abstract description 237
- 239000000049 pigment Substances 0.000 claims abstract description 128
- 239000000758 substrate Substances 0.000 claims abstract description 59
- 239000011230 binding agent Substances 0.000 claims description 26
- 238000013461 design Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 238000004132 cross linking Methods 0.000 claims description 4
- 230000010287 polarization Effects 0.000 claims description 4
- 230000002123 temporal effect Effects 0.000 claims description 2
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 claims description 2
- 238000001227 electron beam curing Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 34
- 230000003287 optical effect Effects 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 5
- 239000000976 ink Substances 0.000 description 5
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- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 239000004922 lacquer Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/20—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2252/00—Sheets
- B05D2252/02—Sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/02—Inorganic fillers used for pigmentation effect, e.g. metallic effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/068—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using ionising radiations (gamma, X, electrons)
Definitions
- the invention relates to a method for producing color effect images on a carrier substrate, to a device for producing a color effect image and to a multilayer body with color effect image.
- Colored iridescent magnetic effect pigments are used for decorative purposes to produce viewing-angle-dependent color effects on the surfaces coated with these pigments.
- the functional principle of the color change is the interference effect that can be observed with thin layers and the orientation of the pigment particles when applied to the surface to be coated by a magnetic field. In this way, groups of pigment particles arranged in the same direction in one orientation can be formed, which can optically delineate against groups with a different orientation or against groups with randomly arranged pigment particles.
- Devices and methods which provide for aligning the magnetic pigment particles by means of permanent magnets, which are arranged below and / or above the substrate to be coated with the pigment particles.
- WO 02/090001 A2 describes a process for the production of color-coated articles by using magnetic pigments. It is envisaged to embed the magnetic pigments in a UV-curable lacquer and to expose the lacquer successively through differently shaped masks, wherein the lacquer is exposed to a differently directed magnetic field before each exposure. By the exposure, the pigments are fixed in the UV-exposed area in their positional orientation predetermined by the applied magnetic field.
- WO 2004/007095 A2 provides for aligning the magnetic pigments with magnets and / or groups of magnets which, due to their size, arrangement
- BEST ⁇ TIGUNSKOPIE and Magnetpolung generate magnetic lines, where the magnetic pigments of a pigmented paint are aligned. After curing of the paint, the magnetic pigments are fixed in position. It is further provided to form the magnets with the cross section of the pattern to be printed, for example with a star-shaped cross-section.
- the invention is based on the object of specifying an improved process for producing color effect images and a device for carrying out this process.
- the object of the invention is achieved by specifying a method for producing color effect images on a carrier substrate, wherein it is provided that a latent magnetic image of magnetic pixels and nonmagnetic pixels is generated on a magnetizable printing plate, that at the magnetizable printing forme Carrier substrate is applied with a decorative layer applied to the carrier substrate with non-spherical, preferably acicular or platelet-shaped magnetic color effect pigments, so that color effect pigments of the decorative layer are changed in their alignment with the carrier substrate by the field line image generated by the magnetic pixels of the magnetizable printing plate and the color effect pigments in the by the
- Field line image of the printing form changed orientation are fixed in the decorative layer.
- the object is further achieved by a device for producing a color effect image on a carrier substrate, wherein it is provided that the device is an application device for applying a decorative layer with non-spherical, preferably acicular or platelet-shaped magnetic
- multilayer bodies having a decorative layer which has spherical, preferably acicular or platelet-shaped magnetic color effect pigments, wherein the color effect pigments are arranged in the decorative layer to form a color effect image, it being provided that the color effect image is formed from pixels which are in one Raster line by line and arranged in columns and that the color effect image has color effect pixels in which the color effect pigments are arranged in a preferably uniformly ordered spatial position so that the brightness and / or the color of each color effect pixel depending on the location of the color effect pigments and / or the viewing direction and / or the wavelength and / or the polarization of the light directed onto the color effect pixel is or is formed.
- the method provides to create a digital record of the color effect image and to use this to generate a latent magnetic image, with the help of which the magnetic color effect pigments are aligned.
- Such a method does not require the manufacture of specially designed magnets, but instead provides for the use of a device that is controllable by a digital data set.
- the inventive method is characterized by speed, high productivity, low cost, high flexibility and long service life and allows design changes with little effort and low cost.
- the multilayer body according to the invention may be formed with further layers, for example with optical and / or electrical functional layers.
- the multi-layer body may be formed as a security element, as it is used to protect documents and / or goods. It can also be provided to provide the multilayer body with additional layers after the color effect image has been applied in further method steps.
- the color effect image has two or more color effect pixels of different types, in which the color effect pigments each in a different orientation to the Carrier substrate are arranged. In this way, rasterized multiple images can be displayed.
- the carrier substrate and the printing forme are moved with the speed and speed matching as long as the color effect pigments in the binder are movable, so that the relative speed between the carrier substrate and the printing plate is zero.
- the carrier substrate may be pressed with rollers to the printing plate, so that the carrier substrate and printing form are moved synchronously.
- Magnetic field and / or in the direction of the magnetic field lines differ. In this way, different field line images can be generated with the same arrangement of the magnetic pixels. This also determines the arrangement and distribution of the magnetic pixels on the orientation of the magnetic color effect pigments. It can therefore be provided that juxtaposed magnetic pixels are formed with different orientation.
- the latent magnetic image is formed of a matrix of magnetic pixels
- the course of the magnetic field lines that determine the color effect image by aligning the color effect pigments is essentially determined by the magnetic properties of the magnetic pixels.
- the digital data set which reproduces the color effect image as a uniformly formed surface, can be selected as the basis for the calculation of the data of the pixels for forming the color effects.
- interesting optical effects can be formed.
- the magnetic pixels can be arranged, for example, to form regions of the field line image in which the magnetic field lines are directed perpendicular to the surface of the carrier substrate or in which the magnetic field lines are parallel to the surface of the carrier substrate.
- the magnetic pixels can also be arranged to form regions of the field line image in which the magnetic field lines are fan-shaped at different angles to the surface of the carrier substrate. It can further be provided that the magnetic pixels are arranged to form regions of the field line image in which the magnetic field lines are directed in an arcuate manner at different angles to the surface of the carrier substrate.
- pixels described above are exemplary of the many possibilities of forming field line images in the context of the method according to the invention. It may further be provided to include non-magnetic pixels, which are covered by the field lines of adjacent magnetic pixels and thereby contribute to the formation of the magnetic field line image.
- the different field line images result in different arrangements of the color effect pigments.
- a region of the color effect image with a vertical arrangement of the color effect pigments appears dark when viewed perpendicularly, and increasingly brighter when obliquely viewed, color effects additionally being able to be formed.
- An area of fan-shaped magnetic color effect pigments creates the illusion of a plastic image in the viewer. Starting from a center line in which the color effect pigments are oriented vertically, in this example, when the color effect image is tilted, the left side of the image is lightened and vice versa.
- An area of color effect pigments aligned in an arcuate manner at different angles to the surface of the carrier substrate forms a bright stripe which travels over the color effect image as it is tilted back and forth.
- the magnetic color effect pigments are nonspherical strip-shaped or rod-shaped pigments having a magnetic core and a shell, which can cause color effects.
- These elongated color effect pigments unlike spherical pigments, can not only arrange along the magnetic field lines, but also align them. Therefore, a first viewing angle-dependent optical effect is already formed by the shape of the color effect pigments regardless of the type of surface coating.
- the nearly point-shaped end faces of the color effect pigments reflect little light and therefore form dark areas when aligned uniformly, while the lateral surfaces of the color effect pigments reflect more light and therefore form bright areas when aligned uniformly.
- a second viewing-angle-dependent optical effect may be caused by a surface coating of the color effect pigments forming optical effects based on refraction, diffraction or polarization.
- the surface coating may, for example, be a thin-layer system which can form the color-shift effect known from oil films, a mirror layer or a cholesteric liquid-crystal layer. In this way, optical effects can be generated which depend on the viewing angle and / or the direction of illumination and / or the wavelength of the light and / or the polarization of the light.
- a color effect image may be generated by including the digital data set of pixels of binary value "1" and pixels of binary value "0".
- the latent magnetic image is thus formed of magnetic and non-magnetic pixels.
- the magnetic color effect pigments are now aligned in the region of a magnetic pixel, while they are arranged in the region of a non-magnetic pixel in a random, random position. Due to the different orientation of the color effect pigments in the two mentioned
- Color effect pigments arranged on nonmagnetic pixels have no preferred orientation.
- Brightness and / or color value of the non-magnetic pixel may be independent of the viewing and / or illumination direction.
- the brightness and / or color value of the magnetic pixel are dependent on the viewing and / or lighting direction, because they are arranged uniformly or according to a predetermined pattern.
- the magnetic color effect pigments are aligned by the action of magnetic pixels and electromagnetic printheads.
- the magnetic color effect pigments are aligned by a temporal sequence of the action of magnetic pixels and / or electromagnetic printheads.
- the magnetic color effect pigments can thus be brought into the end position in successive steps, in which they can assume intermediate layers, in which they have the desired optical effect.
- the color effect pigments are mobile in the binder, magnetic alignment is not a lazy process. It can therefore also be provided that the magnetic color effect pigments are aligned by a temporary magnetic pulse.
- one of the printheads as a printhead embracing the first electromagnetic printhead, the magnetic
- the printing head encompassing the printhead may have a slot through which the printing form is passed, which may be, for example, designed as an endless belt or as a rotating drum printing form.
- the electromagnetic erase head can advantageously be formed in a line of individually controllable magnetic heads. Such an erase head can delete pixel by pixel, ie form a pixel as a non-magnetic pixel and / or actively bring color effect pigments into an unordered position.
- the erase head can be provided with the erase head to form the non-magnetic pixels and thereby delete the previously generated pixels and form further non-magnetic pixels to be overwritten with a new magnetic pixel below.
- it is provided to activate the erase head only when the of the previous first print head generated image line is disposed below the erase head.
- electromagnetic printheads which generate the latent magnetic image on the magnetizable printing form, according to a first, the arrangement of the magnetic pixels and non-magnetic pixels descriptive digital data set are driven. In this way, preferably color effect images can be generated, in which arranged in the magnetic pixels color effect pigments are aligned in the same way.
- the first data record is calculated by a computer from a second data record which describes the graphic design of the color effect image.
- the resulting design options of the color effect image are described in detail above.
- the inventive method provides that a decorative layer is applied to the carrier substrate as a decorative layer, in which the magnetic color effect pigments are incorporated in a binder by the latent magnetic image alignable.
- a decorative layer is applied to the carrier substrate as a decorative layer, in which the magnetic color effect pigments are incorporated in a binder by the latent magnetic image alignable.
- Binder is set so that the color effect pigments can move freely.
- binders acrylates can be provided.
- the solids content may be 20% to 40%, the viscosity may be set at 100 Pa s to 1600 Pa s, preferably at 200 Pa s to 300 Pa s.
- the color effect image formed by the process according to the invention visually stands out from the image background when the decorative layer is applied over a surface or area, because the color effect pigments arranged in the image background are arranged in a random position, while the color effect pigments are aligned in a predetermined manner in the area of the color effect image, thus the above cause optical effects described and visually stand out from the neutral image background.
- the color effect pigments are fixed after alignment in the decorative layer by drying or by crosslinking of the binder. Drying here means that the binder is converted from the liquid to the solid state by driving off a solvent component. It
- the binder may also be a binder that can be converted from the liquid to the solid state by a chemical reaction, wherein it may be formed from one or more components.
- the binder is crosslinked by UV irradiation.
- the carrier substrate is fed in and out in a roll-to-roll process.
- the device comprises a first electromagnetic printhead, which surrounds the printing plate and / or the carrier substrate, an electromagnetic erase head, which is arranged after the first electromagnetic printhead, and at least one further electromagnetic printhead, according to the erase head is arranged and whose magnetic field lines are directed parallel to the surface of the printing plate and / or the carrier substrate comprises.
- Two adjacent magnetic pixels can therefore be formed with this device with different magnetic orientation and / or magnetic polarity and / or magnetic force.
- the electromagnetic printheads and / or the electromagnetic erase head have juxtaposed magnetic heads, which form a perpendicular to the transport direction of the printing plate and / or the carrier substrate aligned printing line.
- the number of magnetic heads in a print line is equal to the number of pixels of an image line of the color effect image. In this way, a particularly high printing speed can be achieved because an image line is formed in one step on the magnetic printing plate.
- the electromagnetic printheads and / or the electromagnetic erase head have one or more magnetic heads, which are arranged in a positionally adjustable position along the printing line aligned perpendicular to the transport direction of the printing forme and / or the carrier substrate.
- Pixel-positionable magnetic heads are not subject to the spatial limitations next to each other in the pixel pitch arranged magnetic heads and can therefore be formed, for example, with higher magnetic force.
- the one or more magnetic heads are arranged to be pivotable about an axis parallel to the surface of the carrier film and / or about an axis perpendicular to the surface of the carrier film.
- the magnetic heads are arranged above the printing form and / or above the carrier substrate.
- the magnetic heads are arranged in pairs opposite each other above and below the printing plate and / or the carrier substrate.
- the paired arrangement of the magnetic heads may be advantageous in order to form a particularly strong and homogeneous magnetic field.
- two successive arranged electromagnetic printheads may be provided for the formation of magnetic pixels of different polarity, which are formed of individually controllable magnetic heads with a common ground line.
- Each of the two print heads thus only forms magnetic pixels of one polarity.
- Such a configuration may allow a particularly simple constructive solution, in particular a space-saving design.
- only one such print head with a common ground line can be provided, wherein the formation of the pixels of different magnetic polarity is provided one after the other.
- the erase head and / or the print head or the print heads form a combined head.
- it is determined by the type of control, ie by the current, the current direction and the duration of the current flowing through the magnetic winding of the magnetic head current, whether a driven magnetic head of the combi head is used as an erase head or as a print head.
- the magnetic head for forming the magnetic pixel is driven sequentially, for example, is acted upon in the first sequence with high-frequency alternating current and acts as an erase head and is acted upon in the second sequence with DC and so the elementary magnets of the magnetic pixel in a ordered position perpendicular to the printing plate brings.
- a continuous endless printing forme is provided, wherein the printing forme may be formed, for example, as an endless printing belt or as a printing drum.
- the transport device is designed as a stepper drive, wherein the step size is equal to the image line spacing of the color effect image.
- the transport device is designed as a stepper drive, wherein the step size is equal to the image line spacing of the color effect image.
- the application device for applying the decorative layer is designed as a mechanical printer, for example as a pressure roller or as a squeegee device.
- the pressure roller can be a profiled or an unprofiled pressure roller.
- the pressure roller can be profiled, for example, in the outlines of the color effect image and thus apply the decorative layer to the carrier substrate as a high-pressure roller or as a gravure roller.
- the fixing device has a thermal source for drying the binder of the decorative layer and / or a UV source for crosslinking the binder.
- FIG. 1 shows a first embodiment of a device according to the invention in a schematic representation
- Fig. 2 is a schematic sectional view of an erase head along the
- Fig. 3 is a schematic sectional view of a first arrangement example of color effect pigments
- Fig. 4 is a schematic sectional view of a write head along the
- Fig. 5 is a schematic sectional view of a second
- 6a is a schematic diagram of a first example of application
- Fig. 6b, 6c are plan views at different angles for the
- FIG. 6d shows an enlarged detail VId from FIG. 6b;
- FIG. 7 shows a second embodiment of a device according to the invention in a schematic representation
- FIG. 8 shows a schematic sectional view of a second write head along the section line VIII-VIII in FIG. 7;
- Fig. 9 is a schematic sectional view of a third arrangement example of color effect pigments.
- 10a is a schematic diagram of a second application example
- FIG. 10b, 10c plan views at different angles for the application example in Fig. 10a;
- FIG. 11 is a schematic sectional view of a fourth
- Fig. 12 is a schematic sectional view of a fifth arrangement example of color effect pigments
- Fig. 13a is a schematic diagram of a third application example
- FIG. 13b, 13c are plan views at different angles for the application example in Fig. 13a;
- Fig. 14 is a schematic sectional view of a sixth
- Fig. 15a is a schematic diagram of a fourth application example
- Fig. 15b, 15c are plan views at different angles for the application example in Fig. 15a.
- FIG. 1 shows a schematic representation of a first embodiment of a device 1 according to the invention.
- a soft magnetic pressure belt 11 is stretched horizontally between two spaced-apart transport rollers 11t and is driven continuously by them.
- the soft magnetic printing belt 1 1 is a
- Magnetic pixels in which magnetic pixels can be formed by the magnetic coercive force of the printing tape is exceeded in the region of the pixel by the action of an external magnetic field.
- the magnetic pixel is now formed as a result of the uniform orientation of its elementary magnets as a permanent magnet and remains in this state until it by applying an opposite direction polarized magnetic field is restored to its non-magnetic initial state.
- a carrier film 12 is brought in a continuous role-to-Rol! E process from above to the printing tape 1 1 and thereby pressed by pinch rollers 13 to the printing tape 1 1.
- Der Republicfolie 12 Respectively die Druckwalze 1 1 im Druckband 11 hearted.
- the pressure rollers 13 are arranged in the embodiment shown in Fig. 1 so that they press the carrier film 12 and the printing tape 1 1 on the transport roller 1 1t and so make the intimate contact between the carrier film 12 and the printing tape 1 1.
- an electromagnetic erase head 15 and an electromagnetic printhead 16 are in the flow direction one behind the other, which are connected to a computer station 17, in which a digital record of a color effect image is stored.
- a printhead 18 and a fixing device 19 are arranged one behind the other in the flow direction.
- the erase head 15 is, as shown in FIG. 2 in a schematic sectional view, formed of juxtaposed magnetic heads 151.
- the number of magnetic heads 151 may correspond to the number of pixels of an image line of the color effect image.
- the magnetic heads have a soft magnetic core, which is surrounded by one or more windings of an electrical conductor and a magnetic field can train if its electrical conductor is traversed by an electric current. Between two mutually opposite magnetic heads 151, non-magnetic pixels 11 u can be formed in the printing belt 11 when the magnetic heads are traversed by alternating current. Preferably, a high-frequency alternating current can be provided for this purpose. As shown in FIG. 1, the erase head 15 is driven by the computer station 17.
- each of the magnetic heads 151 can be provided to each of the magnetic heads 151 to be arranged in pairs spaced from each other and to guide the printing tape 1 1 through the slot formed between them. But it can also be provided to arrange the magnetic heads 151 only on the top or the bottom of the printing tape 1 1.
- Fig. 3 shows a schematic representation of a section of the printing tape 1 1 with non-magnetic pixels 11 u, above which color effect pigments 20p in disordered, i. are arranged in a random position.
- the write head 16 may in principle be designed like the erase head 15, i. are formed in a row of juxtaposed magnetic heads 16 s and 16 s' (see Fig. 4). Between two opposing current-carrying magnetic heads 16 s 1 1 magnetic pixels 1 1 m can be formed in the printing belt.
- the magnetic heads 16s' are non-current magnetic heads, i. no magnetic field is formed between them.
- the magnetic and non-magnetic pixels form a latent one in the printing form 1 1 magnetic image intended to align magnetic color effect pigments 20p (see Fig. 3).
- the printhead 18 is advantageously designed as a digital printhead for applying inks or inks and can be controlled by the computer 17.
- the print head 18 applies a decorative layer 20 (see FIG. 3) to the carrier substrate 12.
- the decorative layer 20 is formed of the magnetic color effect pigments 20p and a binder.
- the print head 18 can be moved along an image line of the color effect image by a stepping motor (not shown) and in this way apply the decorative layer 20 pixel by pixel.
- the print head 18 may have a plurality of ink reservoir, so that in addition to the decor ink further inks can be applied.
- a visual representation can be printed together with the color effect image, which forms, for example, the environment of the color effect image.
- a doctor roller o.a. be provided to print the carrier film 12 over the entire surface or in strips with the decorative layer 20.
- the viscosity of the binder of the decorative layer 20 in which the color effect pigments 20p are bonded is set so that the color effect pigments 20p in the binder are free to move.
- the binder may be a solution that is curable by evaporation of a solvent. However, it may also be a polymer which can be crosslinked by heat or by UV light.
- the freely movable rod-shaped magnetic color effect pigments 20 p of the decorative layer applied to the carrier film 12 in an unordered position are now aligned along the magnetic field lines of the latent magnetic image formed in the printing belt 11. In this way, the color effect pigments 20p can be brought into a position such that a color effect dependent on the viewing angle and / or the illumination direction is formed, which is described in more detail below.
- the fixing device may comprise a lamp 191, which may be formed as a thermal source or as a UV source.
- the carrier film 12 and the printing tape 1 1 in relative silence when they are moved under the print head 18 and through the fixing device 19. Therefore, the magnetic color effect pigments 20p are reliably fixed in position prior to curing of the binder by the magnetic field lines emanating from the printing belt 1 1.
- the stored on the printing tape 1 1 latent magnetic image is not subject to wear, it may be provided to put the magnetic head 14, the erase head 15 and the write head 16 out of operation when the printing tape 1 1 is completely described and only back to operation take when the print tape 11 is to be rewritten.
- Fig. 5 shows a schematic representation of a section of the printing tape 11 with magnetic pixels 11 m and 1 1m ', on which the printed with a decorative layer 20 carrier film 12 is arranged.
- the magnetic pixels 1 1 m and 11 m 'in Fig. 5 are not drawn magnetic field lines, which are directed perpendicular to the outer surface of the printing belt 11.
- the two adjacent magnetic pixels 11 m and 11 m ' have different magnetic poles.
- adjacent color effect pigments 20 p are attracted, so that the color effect pigments 20 p are arranged approximately parallel and perpendicular to the carrier film 12.
- FIGS. 6a to 6c now show which optical effect with that shown in FIG.
- FIGS. 6b and 6c show a color effect image 21 which is arranged on the carrier foil 12. As is shown in section in FIG. 6a, it is illuminated by a light source 22 arranged above the color effect image 21 and observed by a viewer in whose eye 23 an image of the color effect image 21 is formed. The viewer sees the color effect image 21 at different angles when he pivots it or when he tilts his head accordingly.
- the pivoting range of the color effect image is designated by a curved double arrow ⁇ in FIG. 6a. Because the color effect pigments 20p are arranged perpendicularly on the carrier film 12, the color effect image 21, as shown in FIG.
- FIG. 6d shows in an enlarged view of an image section VId from FIG. 6b, by way of example, the formation of the color effect image 21 from individual pixels, which are identified as black areas in FIG. 6d.
- the background of the color effect image is also formed of pixels which are applied to the carrier foil 12 and which are pixels which are not covered with color effect pigments. These pixels are shown in FIG. 6d as white areas.
- the outer edges of the color effect image 21 are graduated in a stepped manner because of the formation of pixels, whereby this gradation is imperceptible by the eye of the observer.
- FIG. 7 shows a second embodiment of a device according to the invention. Identical elements are provided with the same reference numerals. The
- Carrier film 12 is fed from a roll to the circulating printing belt 11 and brought with this by the pressure rollers 13 to the plant, which face two spaced-apart transport rollers.
- the print head 18, an electromagnetic printhead 14 embracing the print tape, the electromagnetic erase head 15, and the electromagnetic printhead 16 are arranged one behind the other in the running direction of the print tape 11.
- the core 14j can be constructed, for example, as a core laminated from a dynamo sheet.
- the core 14j is partially surrounded by a wire winding 14 w, which forms a magnetic field when current flows.
- the magnetic field is directed so that the magnetic field lines extend transversely to the direction of movement and parallel to the outside or to the inside of the printing belt 11.
- both the Elementary magnets of the printing tape 1 1 and the applied on the carrier film 12 in the decorative layer color effect pigments are both the Elementary magnets of the printing tape 1 1 and the applied on the carrier film 12 in the decorative layer color effect pigments.
- the magnetic heads of the erasing head 15 intended to form non-magnetic pixels are excited with preferably high-frequency alternating current. In this way, the color effect pigments aligned by the print head 14 are again brought into an unordered position in these pixels.
- the magnetic heads of the print head 16 driven by the computer station 17 When the image line is now under the print head 16, the magnetic heads of the print head 16 driven by the computer station 17 generate magnetic pixels whose field lines do not run parallel to the surface of the print tape 11.
- the field lines of the magnetic heads of the print head 16 are directed perpendicular to the surface of the printing tape 1 1 and to the surface of the carrier film 12, so that the color effect pigments are erected along the field lines.
- the magnetic field of the magnetic head can be adjusted so that it is not able to completely upright the color effect pigments under it. It may be provided to determine the process parameters by test series, wherein the position of the pixels to adjacent pixels is to be considered.
- the printheads 14 and 16 and the erase head 15 are constantly in operation and thereby controlled by the computer station 17 synchronously to the printer 18.
- the duration of the activation of the magnetic heads can be varied, wherein the dynamic Control can be particularly advantageous at high transport speed of the carrier substrate.
- the erase head 15 and / or the printhead 16 can be provided to form the erase head 15 and / or the printhead 16 only with at least one magnetic head, which is driven by a stepping motor and can be moved along an image line.
- a magnetic head may also be pivotable, so that it can align the color effect pigments obliquely in a particularly simple manner.
- the fixing device 19 is arranged behind the write head 16.
- a printing drum may be provided instead of the printing tape 1 1, a printing drum may be provided.
- the printing drum may be formed of non-magnetic material and be wrapped by the film 12.
- the printhead 18, the encompassing electromagnetic printhead 14, the electromagnetic erase head 15 and the electromagnetic printhead 16 are accordingly arranged one behind the other at the circumference of the printing drum in the direction of rotation of the printing drum, i. the film 12 passes in the order given the printheads or the erase head.
- Fig. 9 shows a schematic representation of a section of the printing tape 1 1 with magnetic pixels 1 1m, the magnetic field lines are aligned obliquely to the surface of the printing tape 1 1.
- Der Magnetband 1 1m ist in Fig. 1 mittechnisch Magnetpixel 1 1m anorg.
- the oblique orientation was created by forming the magnetic pixels 1 1m successively with the print head 14 and the print head 16, as described above.
- the elementary magnets of the pixels 1 1 m were aligned with the print head 14 parallel to the surface of the carrier film 12 and then erected with the print head 16 by about 45 °.
- the color effect pigments 20p are also inclined at about 45 ° to the surface of the carrier sheet 12.
- FIGS. 10a to 10c now show the optical effect which can be formed with the oblique arrangement of the color effect pigments 20p described in FIG. As shown in FIG. 10a, the color effect pigments 20p are arranged obliquely on the carrier film 12.
- FIG. 10a the color effect pigments 20p are arranged obliquely on the carrier film 12.
- FIG. 10b reproduces the image impression when the eye 23 of the observer looks at the longitudinal sides of the color effect pigments 20p
- FIG. 10c when the eye 23 of the observer looks at the end faces of the color effect pigments 20p. Brightness and / or color changes of the color effect image 21 can be observed between the two extreme positions of the color effect image 21.
- Fig. 1 1 shows a schematic representation of a section of the printing tape 1 1 with magnetic pixels 1 1 m, the magnetic field lines are aligned parallel to the surface of the printing belt 1 1.
- the color effect pigments 20p are arranged parallel to the surface of the carrier film 11. When viewed vertically, such a pixel appears as a bright pixel, since all incident light is reflected back.
- the magnetic pixels 11 m are produced with the field lines aligned parallel to the surface of the printing tape 11 by the print head 14, which completely encompasses the printing tape 11.
- the magnetic pixels 1 1 m in this orientation only small forces on the magnetic color effect pigments 20p exercise, so that as described above in Fig. 7, the direct alignment of the color effect pigments may be provided by the print head 14.
- Fig. 12 shows a schematic representation of a section of the printing tape 11 with magnetic pixels 11m and 11 m ', the magnetic field lines are aligned fan-shaped. Such an alignment is produced by the fact that the left pixel 1 1 m 'is formed by the print head 14 and the two adjacent pixels 11 m through the erase head 15 and the print head 16.
- the two pixels 11 m are formed with the same position of the magnetic poles ie the color effect pigments 20p disposed on them repel each other.
- the pixel effect 1 1 m 'adjacent color effect pigments 20p are attracted by this and therefore assume a significant tilt.
- FIGS. 13a to 13c now show which optical effect can be formed with the arrangement of the color effect pigments shown in FIG. For the description of the arrangement, reference is made to Figs. 10a to 10c.
- the eye 23 of the observer in the two extreme outer layers of the color effect image 21 is directed in each case on the long sides of the color effect pigments 20p, so that this side of the color effect image 21 appears bright and the other side of the color effect image 21 dark.
- the color effect pigments 20p are arranged symmetrically to the symmetry axis of the color effect image 21, so that the axis of symmetry marks the light-dark boundary of the color change.
- Fig. 14 shows a schematic representation of a section of the printing tape 11 with magnetic pixels 11m and 1 1 m ', the magnetic field lines are aligned so that the inclination angle of the color effect pigments 20p increases from pixel to pixel or decreases.
- a middle pixel 1 1 m and an adjacent pixel 11 m 'of an image line are shown.
- the color effect pigments 20p can be arranged with an arcuate course on the carrier film 12, the effects of which are shown in FIGS. 15a to 15c by way of example.
- a light stripe travels over the color effect image 21.
- This stripe is caused by sequentially bringing the color effect pigments 20p into a position in which the viewer's eye 23 is perpendicular looking at the long sides of the color effect pigments 20p, so that the light reflected from the long sides of the light is completely directed into the eye 23 of the observer and there generates a bright light impression.
- the solution according to the invention is not limited to the application examples shown. Because the orientation of the color effect pigments is determined not only by the magnetic properties of the individual pixels, but also by the arrangement of the pixels to each other, a variety of color change effects can be formed, which go beyond the illustrated embodiments. Such Color-changing effects can not be imitated with a color-copying process and can therefore be used preferably as a security feature in addition to decorative purposes.
- an effective and cost-effective method for the production of color effect images is specified, which is characterized by high flexibility, high processing speed and low operating costs.
Landscapes
- Printing Methods (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005019919A DE102005019919A1 (de) | 2005-04-27 | 2005-04-27 | Verfahren zur Erzeugung von Farbeffektbildern |
PCT/EP2006/003841 WO2006114289A1 (de) | 2005-04-27 | 2006-04-26 | Verfahren zur erzeugung von farbeffektbildern |
Publications (2)
Publication Number | Publication Date |
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EP1874487A1 true EP1874487A1 (de) | 2008-01-09 |
EP1874487B1 EP1874487B1 (de) | 2014-07-02 |
Family
ID=36761020
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Application Number | Title | Priority Date | Filing Date |
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EP06724571.2A Not-in-force EP1874487B1 (de) | 2005-04-27 | 2006-04-26 | Verfahren zur erzeugung von farbeffektbildern |
Country Status (4)
Country | Link |
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US (1) | US8263191B2 (de) |
EP (1) | EP1874487B1 (de) |
DE (1) | DE102005019919A1 (de) |
WO (1) | WO2006114289A1 (de) |
Families Citing this family (18)
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US7047883B2 (en) | 2002-07-15 | 2006-05-23 | Jds Uniphase Corporation | Method and apparatus for orienting magnetic flakes |
US11230127B2 (en) | 2002-07-15 | 2022-01-25 | Viavi Solutions Inc. | Method and apparatus for orienting magnetic flakes |
US7934451B2 (en) | 2002-07-15 | 2011-05-03 | Jds Uniphase Corporation | Apparatus for orienting magnetic flakes |
JP5259946B2 (ja) | 2005-11-18 | 2013-08-07 | ジェイディーエス ユニフェイズ コーポレーション | 光学効果の印刷のための磁性板 |
EP1990208A1 (de) * | 2007-05-10 | 2008-11-12 | Kba-Giori S.A. | Vorrichtung und Verfahren zum magnetischen Übertragen von Markierungen auf eine auf ein Substrat aufgetragene Beschichtungszusammensetzung |
AU2008219354B2 (en) | 2007-09-19 | 2014-02-13 | Viavi Solutions Inc. | Anisotropic magnetic flakes |
DE102010041398A1 (de) * | 2009-10-22 | 2011-04-28 | Manroland Ag | Einrichtung und Verfahren zum Beschichten |
GB201001603D0 (en) * | 2010-02-01 | 2010-03-17 | Rue De Int Ltd | Security elements, and methods and apparatus for their manufacture |
EP2802461B1 (de) * | 2012-01-12 | 2018-10-17 | Viavi Solutions Inc. | Verfahren zum herstellen eines artikels mit gekrümmten mustern aus ausgerichteten pigmentflocken |
BR112014026974B1 (pt) | 2012-05-07 | 2020-12-08 | Sicpa Holding Sa | camada de efeito óptico, dispositivo e método para produzir a mesma, documento de segurança e uso de uma camada de sefeito óptico |
TW201431616A (zh) * | 2013-01-09 | 2014-08-16 | Sicpa Holding Sa | 顯示取決於視角的光學效應之光學效應層;用於其生產之工藝和裝置;攜帶光學效應層之物品;及其用途 |
DE102013015277B4 (de) | 2013-09-16 | 2016-02-11 | Schwarz Druck GmbH | Orientierung magnetisch orientierbarer Partikel in einer Farbe mit mehreren einander überlagerten Magnetfeldern |
ES2755151T3 (es) * | 2013-12-04 | 2020-04-21 | Sicpa Holding Sa | Dispositivos para producir capas de efecto óptico |
MA42359B1 (fr) * | 2015-11-10 | 2019-01-31 | Sicpa Holding Sa | Appareils et procédés de production de couches à effet optique comprenant des particules de pigment magnétiques ou magnétisables non sphériques orientées |
FR3067729B1 (fr) * | 2017-06-19 | 2020-05-08 | Gerflor | Procede de realisation d'une couche decor presentant un aspect tridimensionnel |
CN111251739A (zh) | 2018-12-29 | 2020-06-09 | 任磊 | 可写入可变编码信息的安全图案及其制备方法和设备 |
CN112140746B (zh) * | 2020-09-16 | 2022-06-21 | 任磊 | 一种安全图案的制备系统 |
TW202239482A (zh) * | 2021-03-31 | 2022-10-16 | 瑞士商西克帕控股有限公司 | 用於產生包含磁性或可磁化顏料粒子且展現一或更多個標記的光學效應層之方法 |
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US3277244A (en) * | 1962-07-17 | 1966-10-04 | Ibm | Magnetic recorder-reproducer |
JPS5116926A (en) * | 1974-08-01 | 1976-02-10 | Mita Industrial Co Ltd | Seidenkasenzono genzohoho |
US4859495A (en) * | 1988-03-15 | 1989-08-22 | Eastman Kodak Co. | Method of preparing perpendicularly oriented magnetic recording media |
FR2629606B1 (fr) * | 1988-03-30 | 1990-11-09 | Bull Sa | Dispositif pour former des images latentes magnetiques sur l'element d'enregistrement d'une imprimante magnetographique |
KR0135274B1 (ko) | 1989-06-27 | 1998-04-22 | 사사끼 가즈오 | 모양 도장막 형성 방법 |
EP0556449B1 (de) * | 1992-02-21 | 1997-03-26 | Hashimoto Forming Industry Co., Ltd. | Lackierung mit magnetisch hergestelltem Muster und lackiertes Produkt mit magnetisch hergestelltem Muster |
JPH05241482A (ja) | 1992-03-02 | 1993-09-21 | Seiko Epson Corp | 多チャンネル磁気ヘッド |
JPH05265352A (ja) | 1992-03-19 | 1993-10-15 | Seiko Epson Corp | 磁気印刷装置 |
DE4439455A1 (de) * | 1994-11-04 | 1996-05-09 | Basf Ag | Verfahren zur Herstellung von dreidimensionale optische Effekte aufweisenden Beschichtungen |
US7114750B1 (en) * | 1995-11-29 | 2006-10-03 | Graphic Security Systems Corporation | Self-authenticating documents |
JPH1124495A (ja) | 1997-07-02 | 1999-01-29 | Iwatsu Electric Co Ltd | 磁気印写装置における潜像記録方法 |
US7047883B2 (en) * | 2002-07-15 | 2006-05-23 | Jds Uniphase Corporation | Method and apparatus for orienting magnetic flakes |
US6808806B2 (en) * | 2001-05-07 | 2004-10-26 | Flex Products, Inc. | Methods for producing imaged coated articles by using magnetic pigments |
US6541078B2 (en) | 2001-05-09 | 2003-04-01 | E. I. Du Pont De Nemours And Company | Process for coating substrates |
JP2003161835A (ja) * | 2001-07-02 | 2003-06-06 | Merck Patent Gmbh | 光学可変マーキング |
US8211509B2 (en) * | 2002-07-15 | 2012-07-03 | Raksha Vladimir P | Alignment of paste-like ink having magnetic particles therein, and the printing of optical effects |
DE602004026193D1 (de) * | 2003-06-30 | 2010-05-06 | Kba Giori Sa | Druckmaschine |
EP1493590A1 (de) * | 2003-07-03 | 2005-01-05 | Sicpa Holding S.A. | Verfahren und Mittel für die Herstellung eines magnetisch-induziertes Bildes in einer Beschichtung die magnetische Teilchen enthält |
JP5259946B2 (ja) * | 2005-11-18 | 2013-08-07 | ジェイディーエス ユニフェイズ コーポレーション | 光学効果の印刷のための磁性板 |
-
2005
- 2005-04-27 DE DE102005019919A patent/DE102005019919A1/de not_active Ceased
-
2006
- 2006-04-26 US US11/911,020 patent/US8263191B2/en not_active Expired - Fee Related
- 2006-04-26 EP EP06724571.2A patent/EP1874487B1/de not_active Not-in-force
- 2006-04-26 WO PCT/EP2006/003841 patent/WO2006114289A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
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See references of WO2006114289A1 * |
Also Published As
Publication number | Publication date |
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DE102005019919A1 (de) | 2006-11-16 |
US20080213516A1 (en) | 2008-09-04 |
EP1874487B1 (de) | 2014-07-02 |
WO2006114289A1 (de) | 2006-11-02 |
US8263191B2 (en) | 2012-09-11 |
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