FR2638663A1 - Method for the coating of a metal sheet - Google Patents

Method for the coating of a metal sheet Download PDF

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Publication number
FR2638663A1
FR2638663A1 FR8815066A FR8815066A FR2638663A1 FR 2638663 A1 FR2638663 A1 FR 2638663A1 FR 8815066 A FR8815066 A FR 8815066A FR 8815066 A FR8815066 A FR 8815066A FR 2638663 A1 FR2638663 A1 FR 2638663A1
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FR
France
Prior art keywords
powder
coating
sheet
energy
metal sheet
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.)
Granted
Application number
FR8815066A
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French (fr)
Other versions
FR2638663B1 (en
Inventor
Christian Lumpp
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FRANCE RAYONNEMENT
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FRANCE RAYONNEMENT
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 FRANCE RAYONNEMENT filed Critical FRANCE RAYONNEMENT
Priority to FR8815066A priority Critical patent/FR2638663B1/en
Publication of FR2638663A1 publication Critical patent/FR2638663A1/en
Application granted granted Critical
Publication of FR2638663B1 publication Critical patent/FR2638663B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
    • 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
    • B05D2202/00—Metallic substrate
    • 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
    • B05D2252/00—Sheets
    • B05D2252/10—Applying the material on both sides
    • 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
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
    • 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
    • B05D3/02—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 baking
    • B05D3/0254—After-treatment
    • B05D3/0263—After-treatment with IR heaters

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Cookers (AREA)

Abstract

Method for the coating of a metal sheet using a paint powder on it, the said powder being subjected to a temperature rise causing it to melt and subsequently to be attached to the said sheet with a view to forming a continuous covering, characterised in that the energy for baking the powder is supplied by a short infrared energy flux defined with respect to the maximum wavelength peak at 1.2 micron according to Wien's law.

Description

La présente invention a pour objet un procédé pour l'enduction d'une tôle métallique à partir d'une poudre de peinture disposée sur celle-ci, ladite poudre étant soumise à une élévation de température entrainant sa fusion et son accrochage ultérieur sur ladite tole en vue de réaliser un revetement continu. The subject of the present invention is a process for coating a metal sheet from a paint powder placed on it, said powder being subjected to a rise in temperature causing its melting and subsequent attachment to said sheet. in order to achieve a continuous coating.

Des procédés de ce type ont déjà été largement mis en oeuvre. Processes of this type have already been widely implemented.

Ils donnent satisfaction mais sont dispendieux en énergie et entrainent de grandes pertes en poudre. They give satisfaction but are expensive in energy and cause large losses of powder.

Par ailleurs, les test montrent que les résistances à l'accrochage et au pliage de la tôle sont susceptibles d'améliorations. In addition, tests show that the resistance to catching and bending of the sheet is capable of improvement.

Conformément à l'invention, ce résultat est obtenu avec un procédé pour l'enduction d'une tôle métallique à partir d'une poudre de peinture sur celle-ci, ladite poudre étant soumise à une élévation de température entrainant sa fusion et son accrochage ultérieur sur ladite tôle en vue de réaliser un revetement continu, caractérisé en ce que l'énergie pour la cuisson de la poudre est apportée par un flux énergétique d'infra rouge court, défini par rapport au pic de longueur d'onde maximum à 1,2 microns selon la loi de Wien. In accordance with the invention, this result is obtained with a method for coating a metal sheet from a paint powder thereon, said powder being subjected to a rise in temperature causing its melting and its bonding. subsequent on said sheet in order to achieve a continuous coating, characterized in that the energy for cooking the powder is provided by a short infrared energy flow, defined with respect to the peak of maximum wavelength at 1 , 2 microns according to Wien's law.

Ainsi, du fait de la transparence de la poudre à l'infra rouge court, on obtient une excellente migration de l'énergie sur le support métallique qui, de préférence, défile en continu. Thus, due to the transparency of the short infrared powder, excellent energy migration is obtained on the metal support which, preferably, runs continuously.

Il y a ainsi bonne dispersion de l'énergie en profondeur et en largeur. There is thus a good dispersion of energy in depth and in width.

La poudre pulvérisée sur le support métallique, et maintenue sur celui-ci par exemple électrostatiquement, peut etre de tout type epoxy, polyuréthane, polyester, etc... The powder sprayed on the metal support, and maintained thereon for example electrostatically, can be of any epoxy, polyurethane, polyester, etc. type.

Par la mise en oeuvre du procédé selon l'invention on obtient une bonne répartition de la cuisson de la poudre, donc un bon accrochage en profondeur. Ceci est confirmé par les tests à l'accrochage et au pliage du produit ainsi revêtu. By implementing the method according to the invention, a good distribution of the cooking of the powder is obtained, therefore a good deep attachment. This is confirmed by the hanging and folding tests of the product thus coated.

L'infra rouge court ainsi utilisé permet une réelle cuisson en continu, des deux côtés de la tôle métallique support, et ce à partir d'une seule source d'énergie. The short infrared thus used allows real continuous cooking, on both sides of the supporting metal sheet, and this from a single energy source.

En effet, l'infra rouge court libère le maximum de son énergie sur le support, qui restitue de manière uniforme sa température à la poudre recto-verso sans qu'il faille une source d'infra rouge de chaque onté de la tôle qui défile. Indeed, the short infrared releases the maximum of its energy on the support, which uniformly restores its temperature to the double-sided powder without the need for an infrared source from each side of the moving sheet .

Ainsi une source disposée au-dessus est suffisante ce qui a les conséquences suivantes - la poudre ne peut tomber sur les émetteurs d'infra rouge, donc les endommager ; - la tôle elle-même ne peut tomber sur les émetteurs ten général en quartz dont très fragiles), - le coût en sources d'énergie est divisé par deux. Thus a source placed above is sufficient which has the following consequences - the powder cannot fall on the infrared emitters, thus damaging them; - the sheet itself cannot fall on general ten emitters in quartz (very fragile), - the cost in energy sources is halved.

Par ailleurs, si l'on prend en compte que les émetteurs à infra rouge court travaillant à environ 24000 et que l'énergie libérée est, selon la loi de PLANCK, proportionnelle à la puissance quatrième de la température absolue, la quantité d'énergie apportée par m2 est très largement supérieure à ce qui peut être apporté par des brûleurs à gaz dont la température est inférieure de plusieurs centaines de degrés. Furthermore, if we take into account that short infrared emitters working at around 24,000 and that the energy released is, according to PLANCK's law, proportional to the fourth power of the absolute temperature, the amount of energy contributed by m2 is very much higher than what can be brought by gas burners whose temperature is several hundreds of degrees lower.

Ainsi, on peut atteindre des résultats execeptionnels à moindres frais, avec des installations nettement plus compactes et sans inertie, car l'énergie infra rouge est libérée immédiatement, sans problème de montée en température comme pour un brûleur à gaz.  Thus, exceptional results can be achieved at lower cost, with significantly more compact installations and without inertia, because the infrared energy is released immediately, with no problem of temperature rise as for a gas burner.

Claims (3)

REVENDICATIONS 1. Procédé pour l'enduction d'une tole métallique à partir d'une poudre de peinture sur celle-ci, ladite poudre étant soumise à une élévation de température entrainant sa fusion et son accrochage ultérieur sur ladite tôle en vue de réaliser un revêtement continu, caractérisé en ce que l'énergie pour la cuisson de la poudre est apportée par un flux énergétique d'infra rouge court, défini par rapport au pic de longueur d'onde maximum à 1,2 microns selon la loi de Wien.1. Method for coating a metal sheet from a paint powder thereon, said powder being subjected to a rise in temperature causing its melting and subsequent attachment to said sheet in order to produce a coating continuous, characterized in that the energy for baking the powder is provided by a short infrared energy flux, defined with respect to the maximum wavelength peak at 1.2 microns according to Wien's law. 2. Procédé selon la revendication 1, caractérisé en ce que la poudre est maintenue sur le support métallique électrostatiquement. 2. Method according to claim 1, characterized in that the powder is maintained on the metallic support electrostatically. 3. Procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce que la tôle défile en continu. 3. Method according to any one of claims 1 and 2, characterized in that the sheet runs continuously.
FR8815066A 1988-11-09 1988-11-09 PROCESS FOR COATING A METAL SHEET Expired - Fee Related FR2638663B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8815066A FR2638663B1 (en) 1988-11-09 1988-11-09 PROCESS FOR COATING A METAL SHEET

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8815066A FR2638663B1 (en) 1988-11-09 1988-11-09 PROCESS FOR COATING A METAL SHEET

Publications (2)

Publication Number Publication Date
FR2638663A1 true FR2638663A1 (en) 1990-05-11
FR2638663B1 FR2638663B1 (en) 1992-04-17

Family

ID=9372006

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8815066A Expired - Fee Related FR2638663B1 (en) 1988-11-09 1988-11-09 PROCESS FOR COATING A METAL SHEET

Country Status (1)

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FR (1) FR2638663B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992001517A1 (en) * 1990-07-18 1992-02-06 Hoechst Italia S.P.A. Method of coating heat sensitive materials with powder paint
EP0798053A1 (en) * 1996-03-28 1997-10-01 Du Pont De Nemours International S.A. Polymer coating for low electrically conductive materials
WO2002026406A1 (en) * 2000-09-29 2002-04-04 Advanced Photonics Technologies Ag Method for producing a product from whose surface foreign matter can be removed

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2331624A1 (en) * 1975-11-13 1977-06-10 Delhomme Jacques Long life protective coating for transformer tanks - using phosphate coating, then electrostatic spraying of powdered plastic
GB2056885A (en) * 1979-08-08 1981-03-25 Blundell Permoglaze Ltd Powder coating cellulose fibre substrates

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2331624A1 (en) * 1975-11-13 1977-06-10 Delhomme Jacques Long life protective coating for transformer tanks - using phosphate coating, then electrostatic spraying of powdered plastic
GB2056885A (en) * 1979-08-08 1981-03-25 Blundell Permoglaze Ltd Powder coating cellulose fibre substrates

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992001517A1 (en) * 1990-07-18 1992-02-06 Hoechst Italia S.P.A. Method of coating heat sensitive materials with powder paint
US5387442A (en) * 1990-07-18 1995-02-07 Hoechst Italia S.P.A. Method of coating heat sensitive materials with powder paint
EP0798053A1 (en) * 1996-03-28 1997-10-01 Du Pont De Nemours International S.A. Polymer coating for low electrically conductive materials
EP0889759A1 (en) * 1996-03-28 1999-01-13 E.I. Du Pont De Nemours And Company Polymer coating for low electrically conductive materials
EP0889759A4 (en) * 1996-03-28 1999-08-25 Du Pont Polymer coating for low electrically conductive materials
WO2002026406A1 (en) * 2000-09-29 2002-04-04 Advanced Photonics Technologies Ag Method for producing a product from whose surface foreign matter can be removed

Also Published As

Publication number Publication date
FR2638663B1 (en) 1992-04-17

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