WO2004054726A2 - Procede d'etuvage et appareil d'etuvage - Google Patents

Procede d'etuvage et appareil d'etuvage Download PDF

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Publication number
WO2004054726A2
WO2004054726A2 PCT/NL2003/000890 NL0300890W WO2004054726A2 WO 2004054726 A2 WO2004054726 A2 WO 2004054726A2 NL 0300890 W NL0300890 W NL 0300890W WO 2004054726 A2 WO2004054726 A2 WO 2004054726A2
Authority
WO
WIPO (PCT)
Prior art keywords
superheated steam
stoving
process according
steam
coating
Prior art date
Application number
PCT/NL2003/000890
Other languages
English (en)
Other versions
WO2004054726A3 (fr
Inventor
Cornelis Roos
Hendricus Cornelis Van Deventer
Original Assignee
Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno
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 Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno filed Critical Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno
Priority to AU2003290445A priority Critical patent/AU2003290445A1/en
Publication of WO2004054726A2 publication Critical patent/WO2004054726A2/fr
Publication of WO2004054726A3 publication Critical patent/WO2004054726A3/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
    • 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
    • B05D3/04—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 gases
    • B05D3/0466—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 gases the gas being a non-reacting gas
    • B05D3/0473—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 gases the gas being a non-reacting gas for heating, e.g. vapour heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air

Definitions

  • the invention relates to processes for stoving coatings on metal, plastic, wooden and ceramic objects.
  • the invention also relates to apparatuses which are suitable for carrying out such processes.
  • stoving is understood to mean the technique known to a skilled person of heating the surface of a coated object to a high temperature.
  • evaporation takes place of solvents and/or diluents, insofar as present.
  • desired lacquer properties are obtained by chemical reactions (including polymerization reactions, in particular cross-linking reactions). These reactions take place as a result of the heat supplied during stoving.
  • the polymerization reactions, cross-linking reactions and/or sinter processes are important, while, for other coatings, in particular, the evaporation of the solvents and/or diluents is important.
  • the formation of the definitive coating involves a combination of evaporation and chemical conversions.
  • stoving is carried out in stoving ovens, in which hot air supplied ensures the supply of heat and the discharge of the solvent and/or diluent vapors and the reaction products formed.
  • an off-gas treatment installation may be deployed to purify the gases before emission and possibly even recover the solvents and/or diluents therefrom. Due to the large gas flows, such off-gas treatment installations usually involve high investment costs and operational costs.
  • a further drawback of conventional stoving techniques is that the reaction products formed in stoving, including oxidation products resulting from the presence of oxygen in combination with the elevated temperature, are difficult to remove and can cause odor nuisance. Examples of such products are acrolein and/or formaldehyde. Non-volatile compounds, such as tar-like cracking products, can also be formed.
  • a further drawback of the conventional stoving techniques is that, due to the presence of oxygen, the stoving temperature is limited to a maximum of approximately 250°C. At higher temperatures, the oxidation reactions can result in discoloring or other deteriorations of the surface.
  • EP-A-0 310 708 describes the curing of resins with a specific chemical composition by contacting them with water.
  • GB-A-1 596 827 relates to the UV curing of specific polymerizable materials with an ethylenic unsaturation in the presence of superheated steam.
  • JP-A-2002-48473 describes an apparatus for heating painted objects using a gas containing 30 to 100% of superheated steam.
  • the superheated steam typically contains a maximum of 10 vol.% of other gases.
  • the present invention thus relates to a process for stoving a coating on an object, in which this object is introduced into an atmosphere, which atmosphere comprises superheated steam.
  • the risk of explosion is removed.
  • this reduces the formation of undesired compounds, in particular of oxidation products.
  • the oxidation products in particular are considered to be responsible for odor nuisance in conventional stoving processes.
  • the present invention thus provides the possibility to reduce odor nuisance in stoving processes.
  • the heat content of superheated steam is considerably larger than that of air, so that a more efficient process is obtained and, in principle, more compact equipment is sufficient.
  • a further advantage of the use of superheated steam is that the heat transfer is considerably improved compared to the heat transfer of air. This is particularly important if metal or ceramic objects are stoved, because such objects are usually characterized by a considerable heat capacity. By using steam according to the invention, the required amount of heat can thus be rapidly transferred.
  • preheating to a temperature of 50 to 120°C, preferably of 75 to 100°C can completely, or virtually completely, prevent condensation in virtually all practical processes according to the invention.
  • a preheating temperature of less than 5Q°C leads to condensation and, consequently, to a final product with an unacceptable quality of the coating.
  • a preheating temperature above 120°C is possible, but usually not desired, because this inter alia causes too large a part of the solvent or diluent to evaporate already in the preheating step, so that this cannot be recovered anymore in the subsequent steam stoving step.
  • the above-described drawbacks of conventional stoving techniques can occur if the preheating temperature is chosen too high.
  • the preheating is preferably carried out by using hot air, for instance heated ambient air under atmospheric pressure.
  • the preheating may also be carried out by means of infrared radiators, induction heating or heating by microwaves. It is also possible first to preheat the substrate and subsequently to apply the coating on the preheated substrate, prior to the stoving process.
  • the atmosphere comprising superheated steam is a gas, which, for a considerable part, for instance, 90 vol.% or more, consists of water (vapor) and further contains, for instance, air, if present.
  • the gas consists entirely, or virtually entirely, of superheated steam.
  • solvents and/or diluents By stoving with superheated steam, solvents and/or diluents will evaporate from the coating and mix with the superheated steam. This offers a further advantage because, in this manner, the solvents and/or diluents can be recovered in a simple manner by condensing the steam after is has been discharged from the stoving installation. In particular, if the solvents and/or diluents are not or poorly water-soluble, which is the case for many organic solvents/diluents, these can simply be separated from the water phase.
  • the invention can very suitably be used for stoving lacquer or paint layers obtained by applying water-based lacquers or paints, i.e. in which water forms an important component in the solvent, or the diluent.
  • the present invention can very suitably be used for stoving ceramic layers (enamel).
  • the dispersion for the glaze is applied in a conventional manner and sintered using the stoving process according to the invention.
  • the temperature of the superheated steam is typically 500-700°C or more.
  • a sub-flow of the steam is cooled down, after it has been discharged from the stoving installation, until condensation of solvent/diluent and steam occurs.
  • the condensation heat released therein can be energetically utilized, which results in an energy saving which may amount to 50% or more.
  • the atmosphere in which the stoving according to the invention takes place substantially consists of superheated steam, in which, during the process, an increasing concentration of solvents/diluents and/or reaction products can be present.
  • superheated steam of atmospheric pressure is used because this is easiest to realize in practice. Other pressures are not excluded.
  • the superheated steam according to the invention has a temperature of 120 to 200°C. The suitable temperature depends on inter alia the type of lacquer and the contact time. Good results can be achieved at, for instance, temperatures higher than 180°C. With particular preference, the temperature of the superheated steam is less than 200°C, which is in keeping with the current practice of stoving in hot air. Temperatures of more than 200°C, for instance to 400°C or more, are also possible, but are not preferred for most stoving applications.
  • Suitable contact times i.e. time periods during which the coated objects are present in the atmosphere of superheated steam preferably vary from a few seconds to tens of minutes, for instance 10 seconds to approx. 60 minutes. With shorter contact times, insufficient curing and/or evaporation of the solvent and/or diluent is/are achieved.
  • the stoving process according to the invention may be used in combination with other curing and/or cross-linking processes, such as, for instance, additional treatment using radiation (for instance IR radiation and/or UV radiation), induction heating and/or heating by microwaves.
  • radiation for instance IR radiation and/or UV radiation
  • induction heating and/or heating by microwaves for instance IR radiation and/or UV radiation
  • An apparatus preferably comprises steam-tight inlet and outlet provisions, which may, for instance, make use of so-called stratification.
  • a heat exchanger is included in the discharge flow. By means of the heat exchanger, then, also, the energy recovery can be realized.
  • the apparatus further comprises a preheating room, for instance a closed room through which hot air can be blown or a room provided with infrared radiators or other heat sources.
  • a preheating room for instance a closed room through which hot air can be blown or a room provided with infrared radiators or other heat sources.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention a trait à des procédés permettant l'étuvage de revêtements sur des objets métalliques, en matière plastique, en bois et en céramique. L'invention a également trait à des appareils aptes à la réalisation de tels procédés. Selon l'invention, l'étuvage est effectué sous un atmosphère, comprenant de la vapeur surchauffée.
PCT/NL2003/000890 2002-12-13 2003-12-15 Procede d'etuvage et appareil d'etuvage WO2004054726A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003290445A AU2003290445A1 (en) 2002-12-13 2003-12-15 Process and apparatus for curing coatings with superheated steam

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1022165A NL1022165C2 (nl) 2002-12-13 2002-12-13 Moffelwerkwijze en -inrichting.
NL1022165 2002-12-13

Publications (2)

Publication Number Publication Date
WO2004054726A2 true WO2004054726A2 (fr) 2004-07-01
WO2004054726A3 WO2004054726A3 (fr) 2004-08-05

Family

ID=32589149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2003/000890 WO2004054726A2 (fr) 2002-12-13 2003-12-15 Procede d'etuvage et appareil d'etuvage

Country Status (3)

Country Link
AU (1) AU2003290445A1 (fr)
NL (1) NL1022165C2 (fr)
WO (1) WO2004054726A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1967803A1 (fr) * 2006-05-18 2008-09-10 FUJIFILM Corporation ProcÉdÉ et appareil pour le sÉchage d'une substance
EP2218519A1 (fr) * 2007-11-14 2010-08-18 FUJIFILM Corporation Procédé de séchage de film de revêtement et procédé pour produire un précurseur de plaque d'impression lithographique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007304A (en) * 1972-03-23 1977-02-08 The Dow Chemical Company Method for coating surfaces
GB1596827A (en) * 1977-03-04 1981-09-03 Dynachem Corp Radiation curing in the presence of steam
EP0310708A2 (fr) * 1983-07-25 1989-04-12 HENKEL CORPORATION (a Delaware corp.) Latex de chlorure de vinylidène en autodéposition et durcissement à basse température
JP2002048473A (ja) * 2000-07-31 2002-02-15 Katsumi Shibata 水蒸気を用いた加熱設備

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007304A (en) * 1972-03-23 1977-02-08 The Dow Chemical Company Method for coating surfaces
GB1596827A (en) * 1977-03-04 1981-09-03 Dynachem Corp Radiation curing in the presence of steam
EP0310708A2 (fr) * 1983-07-25 1989-04-12 HENKEL CORPORATION (a Delaware corp.) Latex de chlorure de vinylidène en autodéposition et durcissement à basse température
JP2002048473A (ja) * 2000-07-31 2002-02-15 Katsumi Shibata 水蒸気を用いた加熱設備

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 06, 4 June 2002 (2002-06-04) & JP 2002 048473 A (SHIBATA KATSUMI), 15 February 2002 (2002-02-15) cited in the application *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1967803A1 (fr) * 2006-05-18 2008-09-10 FUJIFILM Corporation ProcÉdÉ et appareil pour le sÉchage d'une substance
EP1967803A4 (fr) * 2006-05-18 2014-05-07 Fujifilm Corp ProcÉdÉ et appareil pour le sÉchage d'une substance
EP2218519A1 (fr) * 2007-11-14 2010-08-18 FUJIFILM Corporation Procédé de séchage de film de revêtement et procédé pour produire un précurseur de plaque d'impression lithographique
EP2218519A4 (fr) * 2007-11-14 2012-03-21 Fujifilm Corp Procédé de séchage de film de revêtement et procédé pour produire un précurseur de plaque d'impression lithographique

Also Published As

Publication number Publication date
NL1022165C2 (nl) 2004-07-15
WO2004054726A3 (fr) 2004-08-05
AU2003290445A8 (en) 2004-07-09
AU2003290445A1 (en) 2004-07-09

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