EP0419377B1 - Verfahren, Vorrichtung und Farbstoff für Laserbeschriftung von Umhüllungen für elektrische Geräte - Google Patents

Verfahren, Vorrichtung und Farbstoff für Laserbeschriftung von Umhüllungen für elektrische Geräte Download PDF

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Publication number
EP0419377B1
EP0419377B1 EP19900420405 EP90420405A EP0419377B1 EP 0419377 B1 EP0419377 B1 EP 0419377B1 EP 19900420405 EP19900420405 EP 19900420405 EP 90420405 A EP90420405 A EP 90420405A EP 0419377 B1 EP0419377 B1 EP 0419377B1
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EP
European Patent Office
Prior art keywords
paint
marking
laser beam
coat
laser
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.)
Expired - Lifetime
Application number
EP19900420405
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English (en)
French (fr)
Other versions
EP0419377B2 (de
EP0419377A1 (de
Inventor
Jean Izoard
Louis-Claude Popon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BLANCOMME
Schneider Electric SE
Original Assignee
BLANCOMME
Schneider Electric SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26227571&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0419377(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from FR8912557A external-priority patent/FR2652480B1/fr
Priority claimed from FR8915853A external-priority patent/FR2654982B1/fr
Application filed by BLANCOMME, Schneider Electric SE filed Critical BLANCOMME
Publication of EP0419377A1 publication Critical patent/EP0419377A1/de
Publication of EP0419377B1 publication Critical patent/EP0419377B1/de
Application granted granted Critical
Publication of EP0419377B2 publication Critical patent/EP0419377B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser

Definitions

  • the invention relates to a method of laser beam marking of an insulating support arranged on a molded plastic casing of an electrical apparatus, which is assembled on a flexible production line by means of an automaton controlled by a computer system.
  • the support or the marking area of the support being coated in a first workstation with at least one layer of paint, having binders and pigments, the layer of paint being dried during the passage through a drying tunnel arranged after the first work station and the marking of variable inscriptions according to the series produced being then carried out at the end of the production line in a second work station by the action of the laser beam causing a deterioration of the binder, or an etching of the paint which visualizes said marking.
  • the laser beam acts as a source of energy applied punctually which causes a surface modification of the irradiated material, making appear a contrast with the adjacent zones not struck by the beam.
  • the laser marking can be done using a mask bearing the corresponding inscriptions, this mask having to be modified at each change of series or by guiding the laser beam, which rewrites under the control of a computer system such as the computer, the text on each piece. This last registration system is much more flexible since it allows a change of registrations almost instantly, but the marking rate is much lower.
  • the second layer of paint is not reactive to the laser, and the writing by laser beam is not controlled by the automated device on the assembly line.
  • the label of a contactor is produced by marking with a laser beam, which causes an attack on the plastic material, and a deterioration of the face of the housing.
  • the marking is controlled by a detector with contacts integrated in the contactor.
  • the object of the present invention is to allow registration by laser beam directly on a part produced on a flexible production line, and to improve the quality of the registration without degrading the part.
  • the establishment on the part or the support to be engraved of one or more layers of paint or ink makes it possible to overcome the characteristics of the support, in particular its color and its reaction to the laser beam.
  • the reaction caused by the laser beam can be a chemical change in color or vaporization of the paint or a physical reaction causing sufficient contrast.
  • the choice of colors and contrast can be increased by applying a second layer of paint with normal characteristics to the layer of paint sensitive to the laser beam.
  • the invention also relates to a marking device placed at the end of the production line and successively comprising a first station applying a reactive laser paint followed by a drying tunnel and a second marking station having a source of laser beam which moves towards the points to be engraved thanks to a control by a computer system.
  • the computer system is advantageously that of the production chain which follows the product along its progress on the line and transmits to the marking device the data to be entered which correspond to the type of product present on the marking station.
  • a YAG laser it is advantageous to use a YAG laser, the flexibility of which is remarkable and the significant presence of pigments in the paint layer ensures the capture of the laser rays and their action on the paint or on certain components of the paint to obtain a contrast sufficient for marking.
  • Different pigments can be used, in particular mineral pigments such as metal oxides which have great stability at high temperature.
  • the pigmented layer is relatively thick, for example greater than 15 microns to form a screen preventing the rays from reaching the support or if they succeed in being sufficiently attenuated to be incapable of deterioration of the support.
  • the paint is with organic pigments the percentage of pigmentation by weight is of course significantly lower, for example by a few percent and these pigments are broken down by the action of the laser beam.
  • the pigments naturally provide their usual protective and coloring function.
  • the invention also relates to a paint capable of being applied to the support to be marked with a laser beam, this paint being characterized in that the pigmentation of the layer of paint covering the support in the marking area is sufficient to absorb and reflect the laser rays and cause a deterioration of the binder or an etching of the paint which visualizes said marking.
  • This deterioration can result in an engraving, due to a removal or a modification of structure to the material and revealing a contrasted relief or by a change of color accentuating the contrast.
  • the two types of deterioration, in this case engraving and writing are present and complementary.
  • the use of a polyurethane paint for the coating of the marking area gives remarkable results of finesse and control of the inscriptions, as well as good adhesion and resistance of the paint, but other paints with different binders are usable, the important characteristics being the degree of pigmentation and the thickness of the layer.
  • the hardener of polyurethane paint is an isocyanate or other suitable hardener, the presence of which produces hardening and can affect the marking, especially when it succeeds quickly applying paint to the production line.
  • the pigments can be stable mineral pigments, in particular iron, titanium or chromium oxides, with a percentage of pigmentation by weight of the paint layer greater than 40% and advantageously close to 60%. Organic pigments such as blue or green phthalocyanine are also suitable, the percentage by weight then being much lower, for example greater than 3%.
  • a manufacturing or assembly line schematically represented by a product transporter 10 includes at the end of the chain a marking zone constituted by four successive stations 1,2,3,4.
  • the products 12 are electrical devices with molded insulating plastic casing such as devices from the range commercially known as Multi 9.
  • the front part of these devices bears inscriptions representative of the characteristics of the device manufactured or mounted on the chain 10.
  • the first station 1 on which the products 12 end is a station for applying a layer of paint 14 to the product marking area.
  • This paint can be applied by appropriate means, in particular by projection, by transfer, by transfer using an intermediate support, by an offset or pad printing process or by any other printing device in particular by screen printing.
  • the transfer can be carried out in the injection mold of the plastic case.
  • the mold comprises a device for unwinding a ribbon on which one or two layers of paint have previously been deposited.
  • the mold impressions are closed directly on the tape which resists the injection temperature of the plastic.
  • the paint comes into contact with the material which makes it melt and which forms a shell in the desired area.
  • the step-by-step advancement of the ribbon is linked to the mold closing system.
  • the paint can also be an ink or a varnish constituting a continuous coating on the marking area.
  • the paint used is a suitable paint reacting to the action of a laser beam so as to produce a sufficient contrast for a direct inscription on the product 12.
  • the product 12 coated with the layer of laser-reactive paint subsequently passes through a drying tunnel schematically represented by station 2 before arriving at a conventional marking station 3.
  • This marking station for example of the pad printing type, allows the affixing of constant inscriptions, that is to say inscriptions appearing on all products produced on the line.
  • the products 12 subsequently arrive at the last work station 4 which is a laser marking station constituted by a source of a laser beam causing the marking area to write variable data, that is to say data specific to each series of 12 products manufactured on the line.
  • the laser beam is advantageously guided by an automatic writing device controlled by the computer system for controlling the production line.
  • YAG or CO2 type laser beam hits layer 14 of paint reactive by causing a superficial reaction of the latter at the point of impact 16.
  • the displacement of the laser beam carries out the recording of the variable data.
  • the writing speed is fast enough to follow the production rate of line 10 and the control of the laser beam by the computer system allows an instant change of marking at the end of each production series. It is clear that the constant inscriptions can also be carried by the laser marking directly on the product which allows the elimination of the marking station 3 by pad printing.
  • the marking by guiding the laser beam can be replaced by a mask marking system which must be changed at the end of each series.
  • FIG. 3 illustrates an alternative embodiment in which the reactive paint layer 14 is coated with an additional layer 18 of standard paint.
  • This additional coating can be carried out at the same work station 1 or on an additional station (not shown) in a manner well known to specialists.
  • the paint of the layer 18 is advantageously of a different color from that of the reactive paint 14 in order to have a difference in color between the external surface and the background of the etching produced by the laser beam.
  • the surface layer 18 can be removed by the action of the laser and makes the activated part of the layer 14 visible.
  • the surface layer 18 can be partially charred to associate its effect with the activated layer 14, causing a modification of the color.
  • the choice of reactive paint for laser beam is determined by the aesthetic and visual appearance of the marking sought and by the nature of the support generally made of plastic but may be of a different material.
  • the marking area is coated with a two-component gray polyurethane paint, the hardener being an isocyanate, and the percentage of pigmentation by weight of the paint layer is greater than 40% and close to 60%.
  • the pigments are essentially titanium oxide and iron oxide, revealing after the laser marking a black writing on a gray background with a deep engraving which accentuates the contrast.
  • the marking essentially results from a deterioration of the paint binder caused by the absorption and reflection of the laser beam by the pigments.
  • the support in this case the material of the molded or produced casing 12, is not affected by the marking, because the pigmentation is sufficient to constitute a protective screen, retaining totally or largely the laser beam.
  • the presence of pigments prevents the total removal of the binder.
  • the adhesion of the paint or the characteristics of the support are not affected by the marking, which is durable.
  • the pigments used may be other oxides, in particular chromium oxide, and be suitable for the desired coloration, but the degree of pigmentation as well as the thickness of the paint layer must be sufficient.
  • the paint comprises organic pigments and under the action of the laser beam these pigments and the binder are broken down and eliminated to obtain the desired contrast. The thickness of the layer and the percentage of pigmentation are then lower.
  • the support can be any material, in particular metal, plastic, paper, glass, the color of which is appropriate, the choice of paint possibly depending on the type of support. Likewise, the method of applying the paint and its hardening have no influence on the marking, which only affects the layer of paint.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Claims (6)

  1. Verfahren zur Laserstrahl-Beschriftung einer Isolierstofffläche, die an einem Spritzgußgehäuse (12) eines in einer flexiblen Fertigungsanlage (10) mit Hilfe einer durch ein EDV-System geführten Steuerung zusammengefügten elektrischen Schaltgeräts ausgebildet ist, wobei in einer ersten Arbeitsstation (1) mindestens eine Farbschicht mit Bindemitteln und Pigmenten auf die Fläche bzw. den Beschriftungsbereich der Fläche aufgetragen wird, die Farbschicht beim Durchlaufen einer hinter der ersten Arbeitsstation (1) angeordneten Tunneltrockenanlage (2) getrocknet wird und das Aufbringen produktserienabhängiger Beschriftungsbilder am Ende der Fertigungsanlage in einer zweiten Arbeitsstation (4) unter Einwirkung des Laserstrahls erfolgt, der eine Zerstörung des Bindemittels oder eine, die genannte Beschriftung sichtbar machende Gravur der Farbschicht bewirkt, dadurch gekennzeichnet, daß
    - die genannte Farbschicht durch einen für die Absorption und Reflexion des Laserstrahls ausreichenden Anteil von Pigmenten laserlichtempfindlich ist und auf einem Beschriftungsbereich der Isolierstofffläche in einer bestimmten Dicke aufgetragen wird, und
    - die Heranführung des Laserstrahls an die einzugravierenden Punkte (16) durch das genannte EDV-System der Steuerung erfolgt, um ein produktspezifisches Beschriftungsbild zu erzeugen, wobei die Beschriftung durch eine Zerstörung des in der Farbe enthaltenen Bindemittels hergestellt wird, die aufgrund der Absorption und Reflexion des Laserstrahls durch die Pigmente eintritt, ohne das Untergrundmaterial zu beeinträchtigen.
  2. Beschriftungsverfahren nach Anspruch 1, dadurch gekennzeichnet, daß auf die laserlichtempfindliche Farbschicht (14) eine Oberflächen-Farbschicht (18) aufgetragen wird, die dazu dient, durch den Laserstrahl verdampft zu werden.
  3. Farbe für die Laserstrahl-Beschriftung von insbesondere aus Kunststoff bestehenden Unterlagen, wobei die genannte Farbe ein Bindemittel sowie Pigmente aufweist und auf den Beschriftungsbereich der Unterlage zur Bildung einer Farbschicht mit einer bestimmten Dicke aufgetragen wird, dadurch gekennzeichnet, daß die prozentualen Gewichtsanteile der Pigmentierung der Farbschicht bei Verwendung stabiler mineralischer Pigmente, insbesondere von Metalloxyden, mehr als 40% und bei Verwendung organischer Pigmente mehr als 3% beträgt, um die Unterlage vor der Einwirkung des Laserstrahls zu schützen sowie den Laserstrahl zu absorbieren und zu reflektieren und dabei eine Zerstörung des Bindemittels oder eine Gravur der Farbschicht zu bewirken.
  4. Farbe nach Anspruch 3, dadurch gekennzeichnet, daß es sich bei den Metalloxyden um Eisen-, Titan- oder Chromoxyde oder um Mischungen dieser Oxyde handelt.
  5. Farbe nach Anspruch 3, dadurch gekennzeichnet, daß die organischen Pigmente Phtalocyaninblau oder -grün enthalten.
  6. Farbe nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Bindemittel ein Polyurethanharz sowie einen Härter auf Isocyanatbasis oder anderer Art enthält und daß die Pigmente Titanoxyd und Eisenoxyd enthalten.
EP90420405A 1989-09-22 1990-09-17 Verfahren, Vorrichtung und Farbstoff für Laserbeschriftung von Umhüllungen für elektrische Geräte Expired - Lifetime EP0419377B2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8912557 1989-09-22
FR8912557A FR2652480B1 (fr) 1989-09-22 1989-09-22 Procede et dispositif de marquage laser de boitiers moules d'appareillages electriques.
FR8915853 1989-11-29
FR8915853A FR2654982B1 (fr) 1989-11-29 1989-11-29 Procede et peinture de marquage laser.

Publications (3)

Publication Number Publication Date
EP0419377A1 EP0419377A1 (de) 1991-03-27
EP0419377B1 true EP0419377B1 (de) 1996-03-06
EP0419377B2 EP0419377B2 (de) 2001-04-18

Family

ID=26227571

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420405A Expired - Lifetime EP0419377B2 (de) 1989-09-22 1990-09-17 Verfahren, Vorrichtung und Farbstoff für Laserbeschriftung von Umhüllungen für elektrische Geräte

Country Status (3)

Country Link
EP (1) EP0419377B2 (de)
DE (1) DE69025686T2 (de)
ES (1) ES2086389T3 (de)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668959A1 (fr) * 1990-11-08 1992-05-15 Merlin Gerin Procede et dispositif pour le depot d'une couche de peinture reactive au laser sur une piece moulee.
ES2102455T3 (es) * 1991-01-17 1997-08-01 United Distillers Plc Marcacion dinamica con laser.
DE19541027A1 (de) * 1995-11-05 1997-02-06 Daimler Benz Ag Lackierung für einen Gegenstand
TW363016B (en) * 1996-01-08 1999-07-01 Nippon Kayaku Kk Laser marking article having two or more layers of thin films on the surface thereof, method for laser marking of the article and ground composition for use in laser marking
DE19630478A1 (de) * 1996-07-27 1998-01-29 Quarzwerke Gmbh Verfahren zur Laserbeschriftung von Folien
DE19719065B4 (de) * 1997-05-06 2005-02-24 Tampoprint Gmbh Verfahren zum Aufbringen von Informationen auf einen Gegenstand
US6852948B1 (en) 1997-09-08 2005-02-08 Thermark, Llc High contrast surface marking using irradiation of electrostatically applied marking materials
US6075223A (en) * 1997-09-08 2000-06-13 Thermark, Llc High contrast surface marking
WO1999025562A1 (en) * 1997-11-14 1999-05-27 Cerdec Corporation Laser marking method and material
EP0922589A1 (de) * 1997-12-10 1999-06-16 Tekmax Inc. Verfahren zur Laserbeschriftung von thermoplastischen Kunststoffen
DE19954366A1 (de) * 1999-11-11 2001-05-17 Basf Ag Verfahren zur Beschriftung von Kunststoffoberflächen
US6791592B2 (en) 2000-04-18 2004-09-14 Laserink Printing a code on a product
US7238396B2 (en) 2002-08-02 2007-07-03 Rieck Albert S Methods for vitrescent marking
GB0226597D0 (en) * 2002-11-14 2002-12-24 Sun Chemical Bv Laser marking process
US7046267B2 (en) 2003-12-19 2006-05-16 Markem Corporation Striping and clipping correction
US7394479B2 (en) 2005-03-02 2008-07-01 Marken Corporation Pulsed laser printing
CN100439117C (zh) * 2005-11-29 2008-12-03 武汉矽感科技有限公司 自动生产线的激光打标系统及其方法
US9744559B2 (en) 2014-05-27 2017-08-29 Paul W Harrison High contrast surface marking using nanoparticle materials
CN106042696A (zh) * 2016-06-28 2016-10-26 广州市铭钰标识科技有限公司 一种管材打标方法
DE102018106580A1 (de) * 2018-03-20 2019-09-26 Erich Utsch Ag Verfahren zur zweifachen Markierung eines Kennzeichenschildes für ein Fahrzeug
US10583668B2 (en) 2018-08-07 2020-03-10 Markem-Imaje Corporation Symbol grouping and striping for wide field matrix laser marking
CN117086488A (zh) * 2023-08-15 2023-11-21 深圳泰德半导体装备有限公司 标记装置和标记设备

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US3676135A (en) † 1970-06-22 1972-07-11 Eastman Kodak Co Process for forming dye images
NL8001731A (nl) * 1980-03-25 1981-10-16 Philips Nv Werkwijze voor het markeren van een kunststofoppervlak en voorwerp voorzien van een gemarkeerd kunststofoppervlak.
NL8204604A (nl) * 1982-11-26 1984-06-18 Wavin Bv Kunststofmateriaal.
JPS60255491A (ja) * 1984-06-01 1985-12-17 Daicel Chem Ind Ltd レ−ザ−記録用フイルム
JPS6129029A (ja) * 1984-07-19 1986-02-08 三菱電機株式会社 電磁継電器等における端子番号等の表示方法
AU597240B2 (en) * 1985-02-05 1990-05-31 Ciba-Geigy Ag Laser marking of pigmented systems
FR2580233B1 (fr) * 1985-04-12 1988-11-25 Rhone Alpes Projets Plast Procede pour rendre une matiere plastique sensible au rayon laser et permettre son marquage au laser et article obtenu notamment pour le marquage des animaux
AT389850B (de) * 1985-09-06 1990-02-12 Walter Sticht Druck- und beschriftungsverfahren fuer bauteile

Also Published As

Publication number Publication date
ES2086389T3 (es) 1996-07-01
DE69025686T2 (de) 1996-09-26
EP0419377B2 (de) 2001-04-18
EP0419377A1 (de) 1991-03-27
DE69025686D1 (de) 1996-04-11

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