EP3530476A1 - Behandlung einer angestrichenen oberfläche mithilfe eines lasers - Google Patents

Behandlung einer angestrichenen oberfläche mithilfe eines lasers Download PDF

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Publication number
EP3530476A1
EP3530476A1 EP19158987.8A EP19158987A EP3530476A1 EP 3530476 A1 EP3530476 A1 EP 3530476A1 EP 19158987 A EP19158987 A EP 19158987A EP 3530476 A1 EP3530476 A1 EP 3530476A1
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EP
European Patent Office
Prior art keywords
paint
layer
patterns
less
appearance
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.)
Withdrawn
Application number
EP19158987.8A
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English (en)
French (fr)
Inventor
Stéphane GUILLIER
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.)
Plastic Omnium SE
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Plastic Omnium 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
Application filed by Plastic Omnium SE filed Critical Plastic Omnium SE
Publication of EP3530476A1 publication Critical patent/EP3530476A1/de
Withdrawn legal-status Critical Current

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    • 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
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/22—Removing surface-material, e.g. by engraving, by etching
    • B44C1/228—Removing surface-material, e.g. by engraving, by etching by laser radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C3/00—Processes, not specifically provided for elsewhere, for producing ornamental structures
    • B44C3/005—Removing selectively parts of at least the upper layer of a multi-layer article

Definitions

  • the invention relates to the field of automotive appearance parts comprising a decorative coating formed of one or more layers of paint.
  • appearance parts such as a tailgate, a spoiler front, a side door, a hood, etc.
  • the invention more particularly relates to a method of producing decorative elements for highlighting a defined area of the appearance part.
  • These decorative elements are in the form of elementary patterns of paint, visible to the naked eye.
  • the invention relates to elementary patterns of which one and / or the other characteristic dimension is of very low value.
  • low value characteristic dimension is understood here to mean a value of width and / or length less than 1 mm and preferably less than 0.5 mm.
  • paint spots of given diameter distributed according to a particular surface density confer particular gradient effects comparable to a pixelated image.
  • These painting patterns can be made directly on the surface to be painted or on a surface having a coating layer of the same or different color paint patterns.
  • a known method for producing these painting patterns is to have a mask having openings of the shape and size of the elementary patterns and distributed over the surface of the mask, and to deposit the paint layer so that the paint reaches the surface to decorate the right of the only parts of the mask having openings.
  • the method according to the invention aims to provide an alternative solution for producing paint patterns whose smallest dimension is less than a factor of ten to the elementary patterns of paint made according to the method described above and to eliminate the disadvantages mentioned.
  • the method according to the invention relates to the production of decorative elements formed of a plurality of identical elementary patterns on the surface of a motor vehicle part.
  • the elementary patterns forming the decorative element can be of large size, (i.e. the smaller characteristic length is greater than 2mm) this method is particularly interesting for the realization of small or very small dimensions. Indeed, the size of the point of impact of the light beam generated by the pulse laser determines the minimum distance between two patterns and the size and accuracy of the pattern of these elementary patterns.
  • a characteristic length substantially corresponds to the greatest distance between two points of the circumference of the pattern and the characteristic width corresponds substantially to the smallest distance between two points located on sides of the circumference being face.
  • a pulse laser makes it possible to remove the decorative coating layer such as a paint in a very precise manner without altering the surface on which the paint layer has been deposited. This operation is performed after complete polymerization of the paint and therefore after a predetermined drying time.
  • This technology is based on the use of the light beam to create a thermal and mechanical interaction with the paint layer.
  • the pulsation corresponds to a laser shot in which a very concentrated energy is produced for a very short time of the order of a few nanoseconds.
  • This laser firing has the effect of raising the paint layer to very high temperature leading to its melting and then its vaporization, eventually leading to the creation of a plasma.
  • the formation and relaxation of the plasma produces mechanical shock waves and acoustic waves that propagate in the material, fragment it, and cause the ejection of particles of various sizes.
  • the underlying material forming the appearance part is not affected by this treatment.
  • the paint layer can then be removed very accurately and patterns can be obtained with clean edges, free of irregularities.
  • the pulse laser used for this type of application is preferably a CO2 laser emitting light whose wavelength is between 9000 nm and 12000 nm.
  • NdYAG pulse lasers or fiber pulse lasers may also be suitable, with the necessary adaptations to these types of lasers.
  • the method according to the invention provides for varying these parameters.
  • the displacement of the light beam is obtained using a galvanometric head, whose mirror movements are controlled by a programmable device for performing the removal process according to a predetermined sequence.
  • a focal diameter of 0.1 mm is useful for making patterns with low spacing between them or having a circumference formed of curves.
  • the area of paint removed at each pass is small.
  • the power delivered by the laser is of the order of 60 W.
  • a larger focal diameter of the order of 1mm or 1.5mm, is less accurate but allows to remove larger paint surfaces at each impact of the light beam. This setting makes it possible to treat the empty surfaces of elementary patterns more quickly.
  • the power of the laser must then be increased to produce a similar removal effect.
  • the power delivered by the laser is then of the order of 110 W.
  • the mirrors and the lenses of the optical device are adjusted so that the focal diameter of the light beam at the impact of said beam on the surface of the aspect piece is between 0.1 mm and 1.5 mm.
  • the figure 1 illustrates a random elementary pattern shape 2 in which the characteristic length is denoted L and the characteristic width is denoted by l.
  • the figure 2 illustrates an elementary pattern 2 rectilinear width l and length L.
  • the figure 3 illustrates elementary patterns 2 having the shape of parallelograms, wherein the characteristic dimension corresponds to the length l of a diagonal.
  • These elementary patterns 2 have the particularity of being able to be achieved by scanning the surface using the light beam following rectilinear paths.
  • Four passages with trajectories forming angles of 0 ° 45 °, 90 ° and 135 ° between them make it possible to define the contou r of an elementary pattern having the shape of an octagon.
  • Three passages with trajectories forming angles of 0, 60 ° and 120 ° between them make it possible to define the outline of an elementary pattern having the shape of a hexagon.
  • Two passages having trajectories forming an angle of 90 ° between them make it possible to define the outline of an elementary pattern having the shape of a square or a rectangle.
  • the scanning speed is limited, in the state of the technologies currently available on the market, by the speed of operation of the electronic switch enabling to interrupt the luminous flux during the change of direction, when the light beam reaches the geometric limit of the elementary pattern in the direction considered.
  • This scanning speed limit is around 5m / s.
  • the figure 4 illustrates the case of a decorative element comprising streaks and formed of elementary patterns of the type of the one shown in FIG. figure 2 .
  • These elementary patterns appear in contrast to the color forming the surface 4 of the appearance part before the deposition of the paint layer 3.
  • the light beam moves linearly alternately in one direction and then in the other in a constant direction here making substantially an angle of 45 °.
  • the elementary patterns form regular streaks of equal length and width, of the same inclination, which are spaced apart by a pitch p which can be constant as shown in FIG. figure 4 , or that can be variable depending on the desired effect. Similarly the width of the streaks can be adjusted at will.
  • the figure 5 represents a decorative element in the form of a ribbed circle, in which the elementary patterns 2 are of the same color as the painting 3, and have variable lengths.
  • the figure 6 illustrates the case of elementary motifs of small dimension of shape octagonal and giving the illusion of appearing in the form of circles or small dots, comparable to pixels, regularly distributed on the surface of the piece of appearance.
  • the scanning movements of the light beam along the four axes perpendicular two by two is illustrated by the arrows.
  • pixels makes it possible to form positive or negative representative images by distributing the pixels judiciously on the surface of the aspect piece, so as to make a circle appear as shown in FIG. figure 7 .
  • a particularly advantageous variant embodiment of the invention consists in depositing, prior to step A, a primer layer serving as a base for the color paint layer 3 itself on the surface of the appearance part.
  • the method according to the invention then makes it possible to produce decorative elements presenting original particularities.
  • One way to proceed is to implement the method as previously described by adjusting the power of the light beam to remove the single layer of paint without altering the primer layer.
  • the elementary patterns then appear in contrast to the primary layer.
  • this first alternative then allows to play on the color variations and promote the highlighting of the decorative element.
  • the primer layer is translucent, this arrangement makes it possible to obtain particularly interesting depth effects.
  • a second way of proceeding is to implement the method by increasing the light power provided by the laser, and to simultaneously remove during the same passage of the light beam, the paint layer and the primer layer.
  • the elementary pattern appears in contrast to the raw surface of the decorative element.
  • the material forming the appearance part is transparent or translucent, and when the primer layer is chosen in a shade that does not allow the light to pass, it is then possible to have a light source under the appearance part to make it appear the decorative element in contrast with the light source placed behind.
  • the opaque primer layer also retains light capable of filtering under the paint layer located at the periphery of the decorative element and to improve the sharpness and the precision of the luminous effect.
  • the decorative element formed elementary patterns can hide the hot spots of light from light scattering irregularities from the light source disposed behind the room.
  • the method according to the invention provides to adapt the power of the laser depending on the type of use.
  • the power of a CO2 type laser whose peak peak power is of the order of 500 W, between 200W and 50W, is varied.
  • the choice of the appropriate power depends, as we have seen, on the size of the focal diameter of the light beam and the thickness of the paint and / or primer layer that is to be removed.
EP19158987.8A 2018-02-27 2019-02-25 Behandlung einer angestrichenen oberfläche mithilfe eines lasers Withdrawn EP3530476A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1851710A FR3078272A1 (fr) 2018-02-27 2018-02-27 Traitement d'une surface peinte a l'aide d'un laser

Publications (1)

Publication Number Publication Date
EP3530476A1 true EP3530476A1 (de) 2019-08-28

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EP19158987.8A Withdrawn EP3530476A1 (de) 2018-02-27 2019-02-25 Behandlung einer angestrichenen oberfläche mithilfe eines lasers

Country Status (3)

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EP (1) EP3530476A1 (de)
CN (1) CN110194019A (de)
FR (1) FR3078272A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3772380A1 (de) * 2019-08-05 2021-02-10 Compagnie Plastic Omnium SE Verfahren zur herstellung eines transparenten fahrzeugteils
EP3815838A1 (de) * 2019-11-04 2021-05-05 Compagnie Plastic Omnium SE Verfahren zur herstellung eines transparenten fahrzeugsteils
EP4309805A1 (de) * 2022-07-21 2024-01-24 Compagnie Plastic Omnium SE Verfahren zur herstellung eines beschichteten fahrzeugteils

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3105092B1 (fr) * 2019-12-20 2022-04-01 Cie Plastic Omnium Se Procédé de fabrication d’une pièce de véhicule transparente ou de carrosserie

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590194A1 (de) * 1992-09-30 1994-04-06 Siemens Aktiengesellschaft Verfahren zur Herstellung einer Sichtblende, insbesondere einer Frontblende in einem Kraftfahrzeug-Bediengerät
DE4419197A1 (de) * 1993-06-11 1994-12-15 Volkswagen Ag Verfahren zum Herstellen einer ein farbiges Dekor aufweisenden Lackierung
FR2723031A1 (fr) * 1994-07-29 1996-02-02 Profil Industries Procede pour former sur un support un motif imprimer
US20060024476A1 (en) * 2000-07-25 2006-02-02 Richard Leland Method of marking a skin for a vehicle interior panel
DE102004055416A1 (de) * 2004-11-17 2006-05-24 Faurecia Innenraum Systeme Gmbh Kraftfahrzeug-Innenverkleidungsteil und Verfahren zur Markierung
US20080241478A1 (en) * 2007-02-20 2008-10-02 Darryl J Costin Decorative Products Created by Lazing Graphics and Patterns Directly on Substrates with Painted Surfaces
WO2014017995A2 (en) * 2012-02-16 2014-01-30 Cms Jant Ve Makine Sanayii A.S. Laser gravure application on wheel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103287180A (zh) * 2012-02-28 2013-09-11 刘迎春 激光雕刻背漆镜子
CN102616067A (zh) * 2012-04-10 2012-08-01 深圳市联懋塑胶有限公司 表面处理立体三维镭雕工艺
CN103358800A (zh) * 2013-08-05 2013-10-23 格林精密部件（惠州）有限公司 一种电子产品高效节能激光图文处理工艺

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590194A1 (de) * 1992-09-30 1994-04-06 Siemens Aktiengesellschaft Verfahren zur Herstellung einer Sichtblende, insbesondere einer Frontblende in einem Kraftfahrzeug-Bediengerät
DE4419197A1 (de) * 1993-06-11 1994-12-15 Volkswagen Ag Verfahren zum Herstellen einer ein farbiges Dekor aufweisenden Lackierung
FR2723031A1 (fr) * 1994-07-29 1996-02-02 Profil Industries Procede pour former sur un support un motif imprimer
US20060024476A1 (en) * 2000-07-25 2006-02-02 Richard Leland Method of marking a skin for a vehicle interior panel
DE102004055416A1 (de) * 2004-11-17 2006-05-24 Faurecia Innenraum Systeme Gmbh Kraftfahrzeug-Innenverkleidungsteil und Verfahren zur Markierung
US20080241478A1 (en) * 2007-02-20 2008-10-02 Darryl J Costin Decorative Products Created by Lazing Graphics and Patterns Directly on Substrates with Painted Surfaces
WO2014017995A2 (en) * 2012-02-16 2014-01-30 Cms Jant Ve Makine Sanayii A.S. Laser gravure application on wheel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3772380A1 (de) * 2019-08-05 2021-02-10 Compagnie Plastic Omnium SE Verfahren zur herstellung eines transparenten fahrzeugteils
FR3099714A1 (fr) * 2019-08-05 2021-02-12 Compagnie Plastic Omnium Se Procédé de fabrication d’une pièce de véhicule transparente
US11358173B2 (en) 2019-08-05 2022-06-14 Compagnie Plastic Omnium Se Method for manufacturing a transparent vehicle part
EP3815838A1 (de) * 2019-11-04 2021-05-05 Compagnie Plastic Omnium SE Verfahren zur herstellung eines transparenten fahrzeugsteils
CN112781006A (zh) * 2019-11-04 2021-05-11 全耐塑料欧洲公司 透明车辆部件的制造方法
EP4309805A1 (de) * 2022-07-21 2024-01-24 Compagnie Plastic Omnium SE Verfahren zur herstellung eines beschichteten fahrzeugteils
FR3138056A1 (fr) * 2022-07-21 2024-01-26 Compagnie Plastic Omnium Se Procédé de fabrication d’une pièce de véhicule munie d’un revêtement

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Publication number Publication date
CN110194019A (zh) 2019-09-03
FR3078272A1 (fr) 2019-08-30

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