EP3898252A1 - Procede pour orienter des particules sensibles au champ magnetique et machine d'impression pour sa mise en oeuvre - Google Patents
Procede pour orienter des particules sensibles au champ magnetique et machine d'impression pour sa mise en oeuvreInfo
- Publication number
- EP3898252A1 EP3898252A1 EP19829533.9A EP19829533A EP3898252A1 EP 3898252 A1 EP3898252 A1 EP 3898252A1 EP 19829533 A EP19829533 A EP 19829533A EP 3898252 A1 EP3898252 A1 EP 3898252A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electromagnets
- magnetic field
- support
- particles
- network
- 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.)
- Pending
Links
Classifications
-
- 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
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/369—Magnetised or magnetisable materials
-
- 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
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
Definitions
- Inks with remarkable optical effects are widely used in the field of fiduciary printing for the production of anti-counterfeiting security elements. More particularly, there are some whose visual effects are obtained by the use of magnetic fields.
- the pigments contained in these inks are then in the form of thin multilayer plates which have the following characteristics:
- a reflective layer (often metallic) thanks to which the plate takes on a brilliant luster when the positions of the lighting and of the observer respect certain specific geometrical conditions, and a much darker shade in the opposite case;
- inks are based on a printing system allowing, when the ink is applied but not yet crosslinked (that is to say not yet dry), to orient the pigment plates by a field magnetic to achieve unique patterns and optical effects in reflection, before freezing the ink.
- the magnetic field is generally produced by one or more magnets, arranged so as to create the desired pattern and encapsulated in a box which is just inserted into the printing cylinders. This is notably described in US2011 / 0168088.
- roller bar (or “rolling bar” in English). It is a pattern in the form of a light bar, which gives the impression of "rolling” up and down when you tilt the support towards you.
- the orientation system is fixed and it is not possible to change the optical effect from one sheet to another or between different portions of tape during printing, if desired .
- the boxes must be mounted on a rotary cylinder which accompanies the sheet, allowing the magnetic ink to remain in the zone of influence of the magnetic matrix for a sufficient duration, giving the inks time to orient themselves.
- the object of the present invention is to resolve this latter difficulty, and to dispense, as far as possible, with the incorporation (as in the prior art discussed above) of the electromagnets within the cylinders.
- the present invention relates to a method for orienting particles sensitive to the magnetic field, particles contained in a printing material affixed to a support, using a device which comprises at least one network R of electromagnets arranged side by side in a vertical position, the upper ends of these electromagnets extending either substantially in the same plane, or in an offset manner, so as to together form a curved surface, characterized by the the orientation of said particles is carried out by subjecting them briefly to said magnetic field generated by said network R of electromagnets.
- the magnetization system does not need to follow the sheet to induce the desired pattern in the ink.
- magnetizable inks are oriented in a versatile manner and one is freed from the constraint of accompanying the printing medium directly above said system, which makes the scope of the invention more wide than in the state of the art.
- the invention makes it possible, by combining the fields produced locally by the different nuclei, to generate a pattern in a moving ink with its support by the only control of the polarity of the currents which supply the coils of the electromagnets.
- the absence of drag related to the relative movement of the printing material, and therefore of the support, and of the matrix of electromagnets is guaranteed by the duration of the pulses, sufficiently short, while the sharpness of the pattern can be enhanced by the application of several successive pulses, in particular by means of several networks of electromagnets, synchronized so as to be superimposed on each other at the same area of said support provided with the material d 'impression.
- the present invention makes it possible to use the same device to produce as many patterns as the resolution of the two-dimensional network (matrix) allows, by a simple adjustment of the currents introduced into the system, which can be done through an interface. adapted.
- - use is made of tubular electromagnets; - use is made of electromagnets supplied individually with electricity and with means for controlling on demand the circulation / non-circulation of current in each electromagnet;
- - Said base is made of ferromagnetic material
- said base comprises a set of individual cavities in which the lower ends of said electromagnets are positioned;
- said electromagnets comprise a soft ferromagnetic core made of a ferromagnetic material with high magnetic permeability, in particular a permeability relative magnetic greater than 20, with high saturation induction, in particular a magnetic saturation greater than 100mT, and with low remanence, in particular a remanence less than 5mT.
- These first two properties ensure the efficiency of the winding on the soft core, while the low remanence allows the magnetic field to return to an almost zero value when the current is cut. Otherwise, a drag effect may appear.
- the present invention also relates to a machine for printing media for fiduciary use for implementing the method according to one of the preceding characteristics.
- FIG. 1 is a simplified profile view of a device that can be used in the context of the invention, it being understood that here are shown only the ferromagnetic cores, their support, as well as the schematic representation of a sheet covered with ink;
- FIG. 1 is a perspective view of the device of the previous figure
- FIG. 4 is a diagram of the pixelation of the desired pattern
- Figure 9 is a view similar to Figure 8, shown from a second different angle, to highlight the effect of movement;
- Figure 10 is a view similar to Figure 8, shown from a third different angle, to highlight the effect of movement;
- Figure 11 is a view similar to Figure 8, shown from a fourth different angle, to highlight the effect of movement;
- FIGS. 12A to 12D are simplified views from above of a matrix with four electromagnets supplied electrically in four different ways with, opposite this matrix, a photograph of the result obtained, corresponding to the phenomenon of particle orientation generated by activating the electromagnets;
- FIG. 13 is a set of diagrams intended to illustrate the processing of a support strip scrolling vertically above a series of devices as mentioned above.
- FIG. 1 and 2 An example of a device 1 usable in the context of the present invention is visible in Figures 1 and 2 attached.
- a "grid” that is to say a two-dimensional network R of one hundred (10 by 10) electromagnets 2, otherwise called wound cores. This makes it possible to constitute 100 “magnetic pixels", each pixel being able to be controlled by means of an electric current flowing through the coil of the corresponding electromagnet 2.
- the network R takes the form of a regular grid, in other words a square tiling of the plane.
- this distribution of the wound cores is absolutely not limiting and it is conceivable that the network takes the form of any tiling of the plane.
- the electromagnets 2 here have a cylindrical shape. Again, even if this form is advantageous, it is not compulsory and one can envisage other embodiments (elongated parallelepipeds, prisms, cubes, biconical diabolo with circular or square base, etc.).
- Grooves 6 and / or perforations 7 are preferably provided in the base 3 to allow the wires 5 for supplying the windings to pass.
- FIG. 3 only two electromagnets 2 and their associated supply wires 5 have been shown in order to facilitate their consultation.
- Figures 1 and 5 is shown, above the device 1 just a part of a support 4 such as a sheet or a support strip which is coated with a pigment or an ink containing magnetizable particles. We have deliberately limited our to representing the fraction of the support 4 which is usefully affected by the device 1.
- a support 4 such as a sheet or a support strip which is coated with a pigment or an ink containing magnetizable particles.
- Figure 12A is shown very schematically a matrix of only four electromagnets 2, all being supplied at + 40A. turns. A corresponding illustration of the particle orientation phenomenon generated by the activation of the electromagnets is visible on the right of the matrix.
- the width of the optical pixels is 1.5 mm, and the winding of 80 turns of copper wire of 100 pm in diameter is supplied with a current of 0.5A
- the power lost by the Joule effect in the windings is l 'order of a tenth of a watt by wound cores, which allows continuous use without excessive heating.
- a support 4 in the form of a strip, which moves from left to right above four identical devices 1, arranged close to each other in the longitudinal direction of advance of the strip. .
- the devices 1 are configured to reproduce the letter "M", as illustrated in FIGS. 6 and 7.
- FIGS. 8 to 11 relate to the effect obtained, in the form of a simulation, by the superposition of a classic effect ("rolling bar”) on a MO pattern (here the letter "K ”) produced by the device according to the invention.
- the printed support is represented from different angles to highlight the effect of movement.
- the device presented here can also be used to perform interactive authentication on a security device containing active inks such as those described in the document US2005181160, that is to say those whose pigments have a degree of freedom giving them reactivity to a magnetic field even after the ink is frozen.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1873318A FR3090992B1 (fr) | 2018-12-19 | 2018-12-19 | Dispositif configuré pour orienter des particules sensibles au champ magnétique, machine et appareil qui en sont équipés |
PCT/EP2019/086113 WO2020127595A1 (fr) | 2018-12-19 | 2019-12-18 | Procede pour orienter des particules sensibles au champ magnetique et machine d'impression pour sa mise en oeuvre |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3898252A1 true EP3898252A1 (fr) | 2021-10-27 |
Family
ID=67107554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19829533.9A Pending EP3898252A1 (fr) | 2018-12-19 | 2019-12-18 | Procede pour orienter des particules sensibles au champ magnetique et machine d'impression pour sa mise en oeuvre |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3898252A1 (fr) |
AU (1) | AU2019410048A1 (fr) |
FR (1) | FR3090992B1 (fr) |
WO (1) | WO2020127595A1 (fr) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2002211680A1 (en) * | 2000-10-13 | 2002-04-22 | Clarity, L.L.C. | Magnetic actuation and positioning |
US20020160194A1 (en) | 2001-04-27 | 2002-10-31 | Flex Products, Inc. | Multi-layered magnetic pigments and foils |
DE10217632A1 (de) | 2002-04-19 | 2003-11-06 | Giesecke & Devrient Gmbh | Sicherheitsdokument |
US7934451B2 (en) | 2002-07-15 | 2011-05-03 | Jds Uniphase Corporation | Apparatus for orienting magnetic flakes |
EP1493590A1 (fr) | 2003-07-03 | 2005-01-05 | Sicpa Holding S.A. | Procédé et moyens de production d'un dessin induit par magnétisme dans une composition de revêtement contenant des particules magnétiques |
DE102005042895A1 (de) * | 2005-09-09 | 2007-03-15 | Securasta Gmbh | Verfahren zur Herstellung eines Gegenstandes mit einer eine optisch erkennbare Struktur aufweisenden Sichtseite und nach dem Verfahren hergestellter Gegenstand |
DE102007052477B4 (de) * | 2007-11-02 | 2010-02-25 | Klöckner Pentaplast GmbH & Co. KG | Verfahren zur Herstellung eines Sicherheitsmediums und Sicherheitsmedium |
MA37495B1 (fr) | 2012-05-07 | 2018-08-31 | Sicpa Holding Sa | Couche à effet optique |
AR107681A1 (es) | 2016-02-29 | 2018-05-23 | Sicpa Holding Sa | Aparatos y procesos para producir capas con efecto óptico que comprenden partículas de pigmento no esféricas orientadas magnéticas, o magnetizables |
DE102017202747B3 (de) * | 2017-02-21 | 2018-08-16 | Koenig & Bauer Ag | Verfahren zur Bearbeitung von Bedruckstoffbogen bei der Herstellung von Wertpapieren sowie Wertpapierdruckmaschine |
-
2018
- 2018-12-19 FR FR1873318A patent/FR3090992B1/fr active Active
-
2019
- 2019-12-18 WO PCT/EP2019/086113 patent/WO2020127595A1/fr unknown
- 2019-12-18 AU AU2019410048A patent/AU2019410048A1/en active Pending
- 2019-12-18 EP EP19829533.9A patent/EP3898252A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
AU2019410048A1 (en) | 2021-07-01 |
FR3090992B1 (fr) | 2021-06-04 |
WO2020127595A1 (fr) | 2020-06-25 |
FR3090992A1 (fr) | 2020-06-26 |
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