EP0930104B1 - Appareil et procédé pour réticuler et durcir une peinture - Google Patents

Appareil et procédé pour réticuler et durcir une peinture Download PDF

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Publication number
EP0930104B1
EP0930104B1 EP98123022A EP98123022A EP0930104B1 EP 0930104 B1 EP0930104 B1 EP 0930104B1 EP 98123022 A EP98123022 A EP 98123022A EP 98123022 A EP98123022 A EP 98123022A EP 0930104 B1 EP0930104 B1 EP 0930104B1
Authority
EP
European Patent Office
Prior art keywords
radiation
varnish
substrate
layer
wavelength
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
EP98123022A
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German (de)
English (en)
Other versions
EP0930104A2 (fr
EP0930104A3 (fr
Inventor
Maximilian Zaher
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.)
Bush Industries Inc
Original Assignee
Bush Industries Inc
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 Bush Industries Inc filed Critical Bush Industries Inc
Publication of EP0930104A2 publication Critical patent/EP0930104A2/fr
Publication of EP0930104A3 publication Critical patent/EP0930104A3/fr
Application granted granted Critical
Publication of EP0930104B1 publication Critical patent/EP0930104B1/fr
Anticipated expiration legal-status Critical
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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
    • B05D3/06—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

Definitions

  • the invention relates to a method and a device for crosslinking and curing of paint on a substrate according to the preamble of claims 1 and 6, respectively.
  • the UV crosslinking (curing) of paints is state of the art.
  • the paint contains so-called photoinitiators (PI).
  • PI photoinitiators
  • the photoinitiators absorb the UV radiation and cause the networking.
  • Various photoinitiators have been used in the art used in a paint, so that over the entire wavelength range the irradiated radiation sufficient Absorption takes place. Photoinitiators are expensive. Become photoinitiators not activated when cross-linked, there is a risk of yellowing for the paint.
  • UV lamps have a very high operating temperature on (eg more than 1000 ° C). These high operating temperatures The UV lights make the use of cooling air or other coolants required. This cooling is expensive and cooling air also causes technical problems regarding Dust, temperature gradients and air swirls.
  • the invention is based on the finding that the use a monochromatic source of UV radiation has significant advantages brings with it.
  • monochromatic means here a relatively narrow wavelength range of UV radiation, as generated for example by an excimer laser, the no special means for wavelength selection (be it in the resonator or outside the resonator).
  • the bandwidth an excimer laser is in this sense as to understand "monochromatic”.
  • a method for curing a coating layer applied to a substrate by irradiation with UV radiation is also known from EP 0 440 178 A1.
  • the substrate passes on a conveyor belt at several UV sources over.
  • the UV sources are monochromatic sources at least partially different Wavelengths.
  • US 4,844,947 describes a method for selectively curing one on one Substrate applied photosensitive paint by means of a UV laser.
  • WO 96/33872 a UV-curable ink on a substrate with the Hardened light of a low-pressure gas discharge lamp.
  • the lamp is in one embodiment surrounded by a reflector arrangement which increases the Luminous efficacy and equalization of the illuminance is used.
  • the reflector assembly By Pivoting the reflector assembly, the lamp can be shielded so that in Essentially no light falls on the substrate. This is to avoid damage to the substrate during standstill of the substrate the lamp passing conveyor.
  • the UV radiation through a beam-expanding lens assembly is directed, by means of which they from different directions on the paint layer and the substrate is steered.
  • Comparable is a device according to the preamble of claim 6 by a beam-expanding lens arrangement, through which the UV radiation is directed to them from different directions on the lacquer layer and the Direct the substrate.
  • the wavelength of the UV radiation, the absorption characteristics of the photoinitiators in the paint and the power density of the radiation are essential parameters in the the curing play a role.
  • suitable tuning of these parameters can the benefits of using a monochromatic UV source are enhanced so that the varnish layer over its entire thickness of the UV radiation completely absorbed.
  • a substantially monochromatic UV radiation source a Excimer laser are used.
  • the wavelength of the UV radiation in the range of 190 to 250 nm, especially at about 248 nm is located.
  • the invention enables homogeneous crosslinking and hardening of paint layers with thicknesses of 50 ⁇ m and more.
  • a laser as a UV radiation source, in particular an excimer laser, has the further advantage that the Prior art still to be listed technical problems in terms of dimensional stability of the substrate (coated object) are largely overcome.
  • the curing with laser radiation allows a targeted local absorption, without the underlying substrate (object) strong is heated.
  • excimer lasers bends, microscopic cracks of the substrate, moisture leakage and other phenomena that affect the quality of the paint coating and in particular their adhesion to the substrate, avoided.
  • the distance between the radiation source (the laser) and the substrate is not critical to that Networking result, so that in the control of a relative movement between laser radiation and object not on the distance needs to be respected.
  • the curing with laser radiation also allows very good results for objects with sharp edges.
  • the networking takes place even on the edges without significant difference to Networking on the surfaces.
  • FIG. 1 shows a side view of the optical system and Figure 2 is a plan view.
  • a substrate (object) 10 is to be provided with a lacquer layer become.
  • the substrate 10 is in the illustrated embodiment from a wood material.
  • substrate made of a plastic, metal or consist of a composite material.
  • the lacquer layer 12 has a thickness of 50 ⁇ m.
  • the source of UV radiation is an excimer laser 14 (type EMG 50 from LAMDA PHYSICS) with KrF gas.
  • the laser 14 emits at a wavelength of about 248 nm.
  • Special facilities for Reducing the bandwidth of the emitted radiation 16 has the laser 14 is not on (eg no grid in the resorner).
  • the excimer laser 14 is operated pulsed.
  • the repetition rate the pulses and the energy of each pulse is adjustable.
  • Figures 1 and 2 show the optical system for steering the Radiation of the excimer laser 14 on the with the lacquer layer 12th Provided substrate 10.
  • a stage 20 is vertical as shown in FIG movable up and down.
  • About a prism 18 of the laser beam passes 16 to another prism 22 and into a double prism 24.
  • the arrangement causes a division of the laser beam 16th in three beam parts, each via lenses 26a, 26b and 26c ( Figure 2) reach the lacquer layer 12.
  • a beam component is let through by the double prism 24 straight and over the Lens 26b shown, a beam component is from the double prism 24th deflected upwards on a mirror 28, from where he over the Lens 26a reaches the lacquer layer 12 and a third Beam portion is directed by the double prism 24 on a mirror 30, from where the beam component through the lens 26c on the paint layer 12 is directed.
  • Figures 3 and 4 show a further embodiment of optical devices for directing the UV laser radiation.
  • Figures are similar or functionally similar Components provided with the same reference numerals.
  • a movable relative to the stage 20' plate 34 is arranged, which supports a prism 32 and a lens 26.
  • Figure 3 shows a side view of the optical system and
  • Figure 4 is a plan view (from above).
  • the stage 20 ' is according to the arrow P 2 vertically up and down sliding.
  • the plate 34 is rotatable about an axis A corresponding to the arrow P 1 (with respect to the stage 20 ').
  • the laser radiation directed via the lens 26 onto the lacquer layer and the substrate 10 is pivoted in accordance with the arrow P 3 .
  • This arrangement also enables homogeneous curing of the lacquer layer 12 on the substrate 10.
  • a cross hatch test gave a very good crosshatch characteristic in the range between Gt1 and Gt2.
  • An abrasion test with steel wool showed a high mechanical resistance the paint layer.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Claims (8)

  1. Procédé pour réticuler et durcir une peinture sur un substrat (10) à l'aide d'un rayonnement UV pour l'essentiel monochromatique, la peinture comportant des photoinitiateurs, et la longueur d'onde du rayonnement UV, la caractéristique d'absorption des photoinitiateurs contenus dans la peinture et la densité de puissance du rayonnement étant harmonisées les unes avec les autres de sorte telle que le rayonnement UV est absorbé sur toute l'épaisseur souhaitée de la couche de peinture (12) à durcir,
    caractérisé en ce que le rayonnement UV traverse un agencement de lentilles (26 ou 26 a-c) d'élargissement du faisceau de rayonnement, à l'aide duquel le rayonnement UV est dirigé à partir de différentes directions vers la couche de peinture (12) et le substrat (10).
  2. Procédé selon la revendication 1,
    caractérisé en ce que le rayonnement UV est généré par un laser excimer.
  3. Procédé selon l'une des revendications 1 ou 2, la peinture ne comportant qu'un seul type de photoinitiateur,
    caractérisé en ce que le maximum d'absorption du type de photoinitiateur contenu se situe à une fréquence différente de celle du rayonnement UV.
  4. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que la longueur d'onde du rayonnement UV varie entre 190 et 250 nm, et se situe plus particulièrement à environ 248 nm.
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que l'épaisseur de la couche de peinture (12) durcie est de 50 µm ou plus.
  6. Appareil pour réticuler et durcir une peinture sur un substrat (10), la peinture présentant des photoinitiateurs, l'appareil comprenant une source de rayonnement UV (14) pour l'essentiel monochromatique, et la longueur d'onde du rayonnement UV, la caractéristique d'absorption des photoinitiateurs contenus dans la peinture et la densité de puissance du rayonnement étant harmonisées les unes avec les autres de sorte telle que le rayonnement UV est absorbé sur toute l'épaisseur souhaitée de la couche de peinture (12) à durcir,
    caractérisé par un agencement de lentilles (26 ou 26a-c) d'élargissement du faisceau de rayonnement, à travers lequel passe le rayonnement UV pour être dirigé à partir de différentes directions vers la couche de peinture (12) et le substrat (10).
  7. Appareil selon la revendication 6,
    caractérisé en ce qu'un laser excimer est prévu comme source de rayonnement UV.
  8. Appareil selon l'une des revendications 6 ou 7,
    caractérisé en ce que la longueur d'onde du rayonnement UV varie entre 190 et 250 nm, et se situe plus particulièrement à environ 248 nm.
EP98123022A 1997-12-09 1998-12-07 Appareil et procédé pour réticuler et durcir une peinture Expired - Lifetime EP0930104B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19754633A DE19754633A1 (de) 1997-12-09 1997-12-09 Verfahren und Vorrichtung zum Vernetzen und Härten von Lack
DE19754633 1997-12-09

Publications (3)

Publication Number Publication Date
EP0930104A2 EP0930104A2 (fr) 1999-07-21
EP0930104A3 EP0930104A3 (fr) 2002-10-02
EP0930104B1 true EP0930104B1 (fr) 2005-04-06

Family

ID=7851267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98123022A Expired - Lifetime EP0930104B1 (fr) 1997-12-09 1998-12-07 Appareil et procédé pour réticuler et durcir une peinture

Country Status (3)

Country Link
EP (1) EP0930104B1 (fr)
DE (2) DE19754633A1 (fr)
ES (1) ES2239378T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10106543A1 (de) 2001-02-13 2002-08-22 Basf Ag Beschichtungsmittelzusammensetzungen
CN111594404A (zh) * 2020-05-14 2020-08-28 青岛科技大学 一种稀薄气体中的石墨烯激光推进方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996033872A1 (fr) * 1995-04-27 1996-10-31 Metronic-Gerätebau Gmbh & Co. Procede et dispositif permettant de durcir des encres d'imprimerie par u.v.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3737455A1 (de) * 1986-11-06 1988-05-19 Westinghouse Electric Corp Einrichtung und verfahren zum erzeugen von farbmustern
DE4002682A1 (de) * 1990-01-31 1991-08-01 Herberts Gmbh Verfahren zum beschichten von substraten mit durch uv-strahlung haertbaren ueberzugsmitteln
DE4123915A1 (de) * 1990-07-19 1992-01-23 Herberts Gmbh Verfahren zum schutz von thermisch empfindlichen aufzeichnungsmaterialien gegen aeussere einfluesse unter verwendung von radikalisch polymerisierbaren ueberzugsmitteln
DE4439350C3 (de) * 1994-10-11 2000-06-15 Alkor Gmbh Verfahren zur Herstellung eines mit UV-härtbarem Lack beschichteten flächenförmigen Trägermaterials

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996033872A1 (fr) * 1995-04-27 1996-10-31 Metronic-Gerätebau Gmbh & Co. Procede et dispositif permettant de durcir des encres d'imprimerie par u.v.

Also Published As

Publication number Publication date
EP0930104A2 (fr) 1999-07-21
DE59812712D1 (de) 2005-05-12
ES2239378T3 (es) 2005-09-16
DE19754633A1 (de) 1999-06-10
EP0930104A3 (fr) 2002-10-02

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