EP1185989B1 - Magnetische beschichtung, verfahren zum beschichten mit dieser beschichtung und vorrichtung zur ausführung des verfahrens - Google Patents

Magnetische beschichtung, verfahren zum beschichten mit dieser beschichtung und vorrichtung zur ausführung des verfahrens Download PDF

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Publication number
EP1185989B1
EP1185989B1 EP00949523A EP00949523A EP1185989B1 EP 1185989 B1 EP1185989 B1 EP 1185989B1 EP 00949523 A EP00949523 A EP 00949523A EP 00949523 A EP00949523 A EP 00949523A EP 1185989 B1 EP1185989 B1 EP 1185989B1
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EP
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Prior art keywords
particles
coating
binder
medium
applying
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Expired - Lifetime
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EP00949523A
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English (en)
French (fr)
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EP1185989A1 (de
Inventor
Claude Texier
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Magnesia Industries Inc
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Magnesia Industries Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/16—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor

Definitions

  • the present invention relates mainly to a magnetic coating, to a process for coating external surfaces, in particular sheet materials or rolls, with such a coating, and to a coating apparatus implementing said method.
  • the invention applies in the field of play, especially for puzzles, board games, educational or didactic materials, in the field of stationery, decoration or building: wallcovering, removable attachment to the using magnetic elements (magnets in English terminology), signaling or magnetic veneer, coating plastered surfaces, for example plasterboard surfaces, or electromagnetic shielding.
  • the invention also applies to the field of advertising, for example for outdoor and indoor posters or posters.
  • the present invention aims to overcome these disadvantages, by providing a magnetic coating generating an anisotropic medium for optimizing the magnetic attraction and sliding forces exerted by the coating, this coating being able to be applied to any support, and in particular paper, cardboard, sheets of material flexible or rigid plastic, wallpaper, walls and others.
  • the magnetic efficiency of the forces exerted by the particles in anisotropic medium is 25 to 30% greater than that obtained in an isotropic medium.
  • the subject of the present invention is a magnetic coating capable of being spread out substantially regularly on a surface, in which conductive particles oriented by a prior magnetization according to an inductive electromagnetic field, in particular ferromagnetic particles such as particles of iron oxide, are embedded in a binder.
  • the coating according to the invention makes it possible to carry out an electromagnetic shielding by firstly ensuring the confinement of the electromagnetic waves emitted in a room and, secondly, by limiting the penetration of electromagnetic waves. in this piece.
  • non-ferromagnetic conductive particles for example copper particles
  • the adhesive used as the main binder is preferably electrically conductive.
  • the conductive particles are rod-shaped in order to increase their ability to orient themselves according to the inductive electromagnetic field.
  • said binder is an adhesive resin, in particular a hot melt glue (hot melt in English terminology), a cold glue or a paint.
  • the adhesive resin is preferably non-conductive of electricity. It is possible, for example, to use dispersing glues, especially acrylic, vinyl acetate, vinyl ethylene acetate copolymer or acrylic styrene, solution-type glues.
  • vinyl acetate acrylic or styrene acrylic, vegetable glues including starch, dextrin or casein or, advantageously hot melt glues made in particular on an ethylene vinyl acetate, ethylene acrylic, polyolefin, styrene butadiene or styrene isoprene basis.
  • the present invention also relates to a process for coating such a coating on a backing support, comprising a step of applying a main binder to the support guided by a conveyor belt, a controlled distribution and distribution step uniformity of the charge of conductive particles in the resin coupled to a step of orientation of the particles by magnetization, followed by a demagnetization step, a step of covering the particles by deposition of a complementary binder, and a drying step of the whole.
  • the magnetization step is followed by a demagnetization step, so as not to disturb the subsequent steps, and the drying step is followed by a step of remagnetization of the particles.
  • An advantageous embodiment consists of spraying an adhesive resin as a binder for covering the particles and laminating a support on the upper surface thus formed to serve as a frontal support.
  • Any type of support may be used as a front support, namely: cardboard, paper, fabric, flexible or rigid plastic sheet, etc., the nature of the front support may be identical or different from that of the back support.
  • the covering step may advantageously consist in spraying a varnish as a complementary binder.
  • the subject of the invention is also a coating apparatus for implementing the method according to the invention, comprising means for feeding the support, feeding continuously or discontinuously, depending on whether the support is in roll or in sheets, means for applying a main binder by pressure rollers or by at least one nozzle, coupled to heating means, a particle reservoir coupled to a sprinkler for distributing the charge of particles, means for distributing the charge particles in the main binder, electromagnetic means for producing an anisotropic magnetic particle magnetization field, a sprayer for depositing the complementary binder, and drying means.
  • the sprinkler is programmed to deliver the quantity of powder corresponding to the charge density chosen, preferably between 100 and 900 g / m 2
  • the binder application means preferably deliver from about 10 to 50 g / m 2 of product
  • the distribution means are constituted by a system of vibrating screens or by at least one dosimeter, able to form particular patterns by masking
  • the electromagnetic magnetization means are formed by an electromagnet.
  • the coating apparatus shown has different continuous work stations used in combination, alternately or optionally.
  • the apparatus is a single-sided device, it being understood that double-sided devices are not outside the scope of the present invention.
  • the non-limiting example presented describes the coating of a wallpaper to illustrate the operation of the apparatus.
  • the apparatus comprises a backing roll for feeding a backing paper 11, rotated by known means, the paper being guided on a continuous conveyor belt 20 driven in translation at the same speed by rotary elements 21.
  • linear speed is for example between 20 and 250 m / min., preferably between 30 and 150 m / min.
  • the strip 20 Opposite the strip 20 are means for applying a hot melt glue, in the form of a lip nozzle 30 coupled to heating means 31, and a press roll machine 40 for application of a glue 12 cold or hot melt.
  • the binder application means preferably deliver about 10 to 50 g / m 2 of product, preferably about 35 g / m 2 .
  • One or other of these glue distribution means is used depending on the nature of the glue.
  • the temperature of implementation of hot melt glues at the moment of magnetization, must be lower than the Curie temperature of the ferromagnetic material used.
  • the application temperature is between 140 and 190 ° C.
  • a roller type machine such as a machine comprising a 3960 Multiscan® generator sold by NORDSON Company connected by automatic heating pipes to automatic guns marketed by this company under the reference H20. The adhesive flows between two rollers 40 and flows through a calibrated space formed between these rollers.
  • a reservoir 50 of particles 13 coupled to a sprinkler 51 is then provided for the distribution of ferromagnetic particles in powder form.
  • the sprinkler is programmed to deliver the quantity of powder corresponding to the chosen charge density, the mixture of a binder typically a paint or an adhesive with ferromagnetic particles forming a charge in the binder corresponding to 200 to 850 g per square meter.
  • iron oxide preferably substantially equal to 800 g per square meter of iron oxide.
  • the maximum amount of ferromagnetic charge that can be accepted by the binder is used, for example six units by weight of ferromagnetic powder for two units by weight of binder.
  • any ferromagnetic material likely to have the desired particle size and stability, especially chemical, over time can be used.
  • soft iron, hardened iron, ferrite, any iron oxide, ferromagnetic rare earths, samarium, barium or cobalt may be used.
  • coated iron particles are used by a protective material against corrosion, for example by a layer of cobalt. It is also possible to use chromium, chromium oxide and the particles used for coating magnetic tapes.
  • the iron oxide particles used are in the form of elongate rods and have a low granularity so as to obtain a smooth surface state. Excellent results were obtained with iron oxide whose particle size was equal to 24 microns, the lower particle sizes also being suitable. If the granular surface condition is acceptable, it is possible to use larger particle sizes, for example between 25 and 300 ⁇ m.
  • a vibrating screen system (not shown) is coupled to the sprinkler 51 to evenly distribute the particles on the backed-up backing paper.
  • a programmable dosimeter may be used to adjust the amount of powder to be deposited. This deposit can be performed with predetermined patterns by masking using pre-cut screens.
  • a magnetic field induced by an electromagnet 60 is created in order to orient by magnetization the particles just deposited in the adhesive resin, that is to say before the solidification of the adhesive.
  • the use of a hot melt glue in the exemplary embodiment is particularly advantageous because it can easily control the opening and closing.
  • the magnetic field is formed between the sprinkler and the distribution means. This solution is advantageous when, depending on the nature of the powder used, a phenomenon of "wicking" may affect the regularity of deposit on the paper.
  • the magnetization is carried out by magnetically polarizing the particles.
  • the coated paper passes into the gap of the electromagnet 60 generating a field Magnetic substantially uniform over the entire width of the paper is used for example an electromagnet generating an intense magnetic field substantially equal to 0.5 Tesla.
  • the viscosity of the coating according to the present invention as well as the amplitude of the magnetic field are such that the migration of the magnetic particles outside the binder and their bonding in the gap of the electromagnet is carefully avoided.
  • guiding means prevent the coated paper of the coating according to the present invention from sticking to one of the poles of the magnet, in the case of the use of a permanent magnet.
  • the coated paper then passes under a degaussing apparatus 70, disposed immediately downstream of the electromagnetic magnetization means.
  • the use of a paint as a binder may be advantageous in providing a desired color. But ferromagnetic particles can change the color of the paint. If this effect is not desired, it can be covered by one or more layers of paint free of ferromagnetic charge.
  • a sprayer 80 then deposits the complementary binder. The flow rate of this sprayer is adjusted so that all the particles are embedded in this binder.
  • This binder can also be a varnish, for example translucent if it is desired to keep the bottom view of the back paper.
  • a front paper support is then to be deposited in this example, and the sprayer 80 delivers in this case a glue as a complementary binder.
  • the front support feed 14 is also performed by a uncoiler roll 90 coupled to pressure rollers 91 on the conveyor belt.
  • a drying tunnel 100 alternately heating rollers, and a final magnetizer 110, arranged downstream of the drying tunnel, are provided.
  • the magnetizer is a drum coupled in rotation to the conveyor belt, alternating south and north poles according to a previously calculated magnetic pitch.
  • the speed of scrolling and magnetization is of the order of 80 m / min.
  • the applied voltage is of the order of 2000 to 3000 V, delivering a field of 8000 to 9000 gauss, for paper widths between 700 and 1400 mm.
  • a final winding roll 120 provides a roll of the product obtained by the process of the invention.
  • an electromagnetic radiation shield it is advantageous to ensure a sufficient charge of ferromagnetic particles to make the coating according to the present invention conductive, at least at the frequencies that it is desired to eliminate.
  • non-ferromagnetic conductive particles for example copper, are used in addition to or in place of the ferromagnetic particles to form a shield or a Faraday cage.
  • Such shielding can protect electronic equipment, including telecommunications equipment and computer equipment, external disturbances and indiscretions by preventing the listening of electromagnetic signals emitted by this type of equipment in operation.
  • the coating apparatus alternatively of the batch feed type, also has different workstations used in combination, alternately or optionally.
  • the paper is fed sheet-by-sheet 21 on the conveyor belt 20 from a feed tray 15, and the back-up feed 24 is also performed by a sheet-fed feed tray 16 coupled with pressing rolls. 17.
  • the feed tanks and the particle charge distribution means are controlled by an automated dispensing system (not shown) known to those skilled in the art and set at a scroll rate.
  • the device glues for example 90 cartons per minute, each carton having a surface of 40 cm by 55 cm.
  • the binder application means, 30 and 40, and the complementary binder 80, identical to those described above, are set by an optical photocell sequential controller 25, connected to the automated distribution system.
  • the final magnetizer 111 is in the form of an electromagnet and the storage system is in the form of a tray 121 capable of stacking the sheets coated by the apparatus according to the invention, by examples of paper sheets decorated or not, cardboard, plastic plates or the like.
  • the invention is not limited to the embodiments described and shown.
  • the method according to the invention also makes it possible to adapt the thickness of the coating according to the basis weight of the two sheets to be glued. For example, laminating a sheet weighing 90 g on a sheet of the same thickness or thicker requires about 90 to 120 g of coating.
  • the magnetized coating of the magnet can also be adapted under the same conditions. In other words, the thickness of the coating can be perfectly adapted to the aesthetic effect, weight, magnetization force and economic cost that it is desired to give.
  • Zone magnetization can be achieved by magnet gaps having the shape of the desired areas either by employing a set of electromagnets arranged in a matrix manner and feeding only
  • a support typically a cardboard or a plastic sheet
  • the coating according to the present invention so as to allow the stacking of parts.
  • a first face of the support receives a non-magnetic coating, the opposite face receiving a coating capable of being magnetized.
  • the two faces receive a coating which is thereafter permanently magnetized.
  • the apparatus according to the invention advantageously comprises means for cutting the coated support, for example to form "magnet" type elements (magnet in English terminology) comprising, after cutting, a support portion relative to a subject or adapted to receive, for example by gluing, another support relating to this subject.
  • the magnets obtained are held on any metal surface, for example a refrigerator door or any surface (paper, cardboard, etc.) covered with a metal coating (coating containing metal powder in filings or other) or integrating a totally or partially metallic surface (strip, grid or other), by the exercise of the magnetic forces created between these magnets and said metal surface.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)

Claims (21)

  1. Magnetische Beschichtung, welche dazu geeignet ist, im Wesentlichen gleichmäßig auf einer Oberfläche (11) aufgetragen zu werden,
    dadurch gekennzeichnet,
    dass ausgerichtete leitfähige Partikel (13), welche durch eine Vormagnetisierung gemäß einem elektromagnetischen Induktionsfeld eine anisotrope Umgebung erzeugen, in einem Bindemittel (12) eingebettet sind.
  2. Magnetische Beschichtung nach Anspruch 1, wobei die leitfähigen Partikel (13) ferromagnetische Partikel wie Eisenoxid-Partikel umfassen.
  3. Magnetische Beschichtung nach Anspruch 1, wobei die leitfähigen Partikel wenigstens zum Teil nichtferromagnetische Partikel wie Kupfer-Partikel umfassen, um eine elektromagnetische Abschirmung zu realisieren.
  4. Magnetische Beschichtung nach einem der vorhergehenden Ansprüche, wobei die leitfähigen Partikel (13) eine Stäbchenform aufweisen.
  5. Magnetische Beschichtung nach einem der vorhergehenden Ansprüche, wobei das Bindemittel ausgewählt ist aus einem thermisch schmelzbaren Adhäsivharz, einem kaltabbindenden Klebstoff oder einem Anstrichmittel.
  6. Magnetische Beschichtung nach dem vorhergehenden Anspruch, wobei das Adhäsivharz vorzugsweise nicht elektrisch leitfähig ist.
  7. Verfahren zum Auftragen einer Beschichtung auf einen Rückenträger (11), umfassend einen Schritt zur Aufbringung eines Hauptbindemittels (12) auf den von einem Transportband (20) geführten Träger, einen Schritt zur kontrollierten Abgabe und gleichmäßigen Verteilung einer Menge von leitfähigen Partikeln (13) in dem Bindemittel, welcher gekoppelt ist mit einem Schritt zur Ausrichtung der Partikel durch ein Magnetfeld, gefolgt von einem Schritt zur Entmagnetisierung, einem Schritt zur Bedeckung der Partikel durch Aufbringen eines zusätzlichen Bindemittels und einem Schritt zur Trocknung der Anordnung.
  8. Verfahren zum Auftragen einer Beschichtung auf einen Rückenträger nach Anspruch 7,
    dadurch gekennzeichnet,
    dass in dem Fall, wenn die Menge der leitfähigen Partikel wenigstens zum Teil ferromagnetische Partikel umfasst, der Schritt zur Magnetisierung von einem Schritt zur Entmagnetisierung gefolgt ist und der Schritt zur Trocknung von einem Schritt zur Remagnetisierung der Partikel gefolgt ist.
  9. Verfahren zum Auftragen einer Beschichtung auf einen Rückenträger nach einem der Ansprüche 7 und 8, wobei die kontrollierte Abgabe der Menge durch Programmierung des Durchsatzes von abgegebenem Pulver abhängig von der Dichte der ausgewählten Partikel und dann eine gleichmäßige Verteilung auf dem zuvor mit Klebstoff versehenen Träger realisiert ist.
  10. Verfahren zum Auftragen einer Beschichtung auf einen Rückenträger gemäß Anspruch 9, wobei der Schritt zur Magnetisierung nachfolgend dem Schritt zur Abgabe und Verteilung der Partikel, jedoch vor dem tatsächlichen Abbinden durch Aushärten des Bindemittels einmal auf die wirksam in dem Hauptbindemittel verteilten Partikel einwirkt.
  11. Verfahren zum Auftragen einer Beschichtung auf einen Rückenträger nach Anspruch 9, wobei die Schritte zur Abgabe, Verteilung und Magnetisierung der Partikel derart kombiniert sind, dass die Partikel vor ihrer wirksamen Verteilung in dem Bindemittel durch Magnetisierung ausgerichtet werden.
  12. Verfahren zum Auftragen einer Beschichtung auf einen Rückenträger nach einem der Ansprüche 7-11, wobei ein Adhäsivharz als zusätzliches Bindemittel zur Bedeckung der Partikel und zum Kaschieren eines Trägers (14) auf die obere Oberfläche, und um als Frontträger zu dienen, versprüht wird.
  13. Verfahren zum Auftragen einer Beschichtung auf einen Rückenträger nach einem der Ansprüche 7-11, wobei der Schritt zur Bedeckung darin besteht, einen Lack als zusätzliches Bindemittel zu versprühen.
  14. Beschichtungsvorrichtung für den Einsatz des erfindungsgemäßen Verfahrens, umfassend Mittel zur Zuführung (10, 15) des Trägers (11, 21) auf einem Transportband (20), Mittel zur Aufbringung eines Hauptbindemittels (12) durch Druckwalzen (40) und durch wenigstens eine Düse (30), welche mit Heizmitteln gekoppelt sind, ein Reservoir (50) von Partikeln (13), welches mit einer Streuvorrichtung (51) für die Abgabe der Menge von Partikeln gekoppelt ist, Mittel zur Verteilung der Menge von Partikeln in dem Hauptbindemittel, elektromagnetische Mittel (60) zum Erzeugen eines anisotropen Magnetfelds zur Magnetisierung der Partikel, eine Sprühvorrichtung (80) zum Aufbringen eines zusätzlichen Bindemittels und Trocknungsmittel (100).
  15. Beschichtungsvorrichtung nach Anspruch 14, wobei die Streuvorrichtung (51) dazu programmiert ist, die Menge von Pulver zu liefern, welche der Dichte der ausgewählten Menge entspricht, wobei die Mittel zur Verteilung durch ein vibrationssiebsystem gebildet sind und die elektromagnetischen Mittel zur Magnetisierung durch einen Elektromagneten (60) gebildet sind.
  16. Beschichtungsvorrichtung nach Anspruch 15, wobei die Mittel zur Verteilung durch wenigstens ein Dosimeter anstelle des Vibrationssiebsystems gebildet sind, wobei das Dosimeter und die Siebe durch Maskierung bestimmte Muster ausbilden.
  17. Beschichtungsvorrichtung nach einem der Ansprüche 14-16, wobei in dem Fall, wenn die Menge wenigstens zum Teil ferromagnetische Partikel umfasst, eine Vorrichtung zur Entmagnetisierung (70) unmittelbar nachgelagert zu den elektromagnetischen Mitteln zur Magnetisierung (60) angeordnet ist und eine Vorrichtung zur abschließenden Magnetisierung (110) nachgelagert zu den Trocknungsmitteln (100) angeordnet ist.
  18. Beschichtungsvorrichtung nach einem der Ansprüche 14-17, wobei, wenn die Zuführung kontinuierlich realisiert ist, der Träger von einer Abspulrolle (10) zugeführt wird, die Zuführung des Frontträgers (14) durch eine Abspulrolle (90) bewerkstelligt wird, welche mit Druckwalzen (91) auf dem Transportband (20) gekoppelt ist, und eine Rolle zur abschließenden Aufwicklung (120) eine Rolle des gewonnenen beschichteten Trägers liefert.
  19. Beschichtungsvorrichtung nach einem der Ansprüche 14-17, wobei, wenn die Zuführung nicht kontinuierlich realisiert ist, der Rückenträger (24) blattweise auf dem Transportband ausgehend von einem Zuführungsbehälter (15) zugeführt wird, und die Zuführung des Frontträgers ebenfalls durch einen Behälter zur blattweise Zuführung (16) bewerkstelligt wird, wobei die Zuführungsbehälter und die Mittel zur Verteilung der Menge von Partikeln durch ein automatisiertes Abgabesystem gesteuert und in einem Ablauftakt geregelt sind.
  20. Beschichtungsvorrichtung nach Anspruch 19, wobei die Mittel zur Aufbringung des Bindemittels (30, 40) und zur Aufbringung des zusätzlichen Bindemittels (80) durch eine sequenzielle optische Steuervorrichtung mit Photozellen, welche mit dem automatisierten Abgabesystem verbunden ist, geregelt sind.
  21. Beschichtungsvorrichtung nach einem der Ansprüche 14-20, wobei Zuschneidemittel für den erhaltenen beschichteten Träger vorgesehen sind, um Teile auszubilden, welche dazu bestimmt sind, auf metallischen Oberflächen durch Ausüben von magnetischen Kräften, welche zwischen dem Teil und der metallischen Oberfläche ausgeübt werden, in Position gehalten zu werden.
EP00949523A 1999-06-15 2000-06-09 Magnetische beschichtung, verfahren zum beschichten mit dieser beschichtung und vorrichtung zur ausführung des verfahrens Expired - Lifetime EP1185989B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9907589 1999-06-15
FR9907589A FR2795223B1 (fr) 1999-06-15 1999-06-15 Enduit magnetique, procede d'enduction d'un tel enduit et appareil d'enduction pour sa mise en oeuvre
PCT/FR2000/001604 WO2000077803A1 (fr) 1999-06-15 2000-06-09 Enduit magnetique, procede d'enduction d'un tel enduit et appareil d'enduction pour sa mise en oeuvre

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EP1185989A1 EP1185989A1 (de) 2002-03-13
EP1185989B1 true EP1185989B1 (de) 2006-03-01

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US (1) US7001645B1 (de)
EP (1) EP1185989B1 (de)
JP (1) JP2003503512A (de)
AT (1) ATE319173T1 (de)
AU (1) AU6285500A (de)
CA (1) CA2376774A1 (de)
DE (1) DE60026314D1 (de)
FR (1) FR2795223B1 (de)
WO (1) WO2000077803A1 (de)

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EP1185989A1 (de) 2002-03-13
US7001645B1 (en) 2006-02-21
WO2000077803A1 (fr) 2000-12-21
ATE319173T1 (de) 2006-03-15
JP2003503512A (ja) 2003-01-28
DE60026314D1 (de) 2006-04-27
FR2795223A1 (fr) 2000-12-22
FR2795223B1 (fr) 2003-02-07
CA2376774A1 (en) 2000-12-21
AU6285500A (en) 2001-01-02

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