EP1040308B1 - Dispositif et procede pour secher des peintures - Google Patents

Dispositif et procede pour secher des peintures Download PDF

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Publication number
EP1040308B1
EP1040308B1 EP98965842A EP98965842A EP1040308B1 EP 1040308 B1 EP1040308 B1 EP 1040308B1 EP 98965842 A EP98965842 A EP 98965842A EP 98965842 A EP98965842 A EP 98965842A EP 1040308 B1 EP1040308 B1 EP 1040308B1
Authority
EP
European Patent Office
Prior art keywords
air
drying
adsorption
working area
lacquer
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
EP98965842A
Other languages
German (de)
English (en)
Other versions
EP1040308A1 (fr
Inventor
Keld Gabelgaard
Heinz Jonas
Artur Kunder
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1040308A1 publication Critical patent/EP1040308A1/fr
Application granted granted Critical
Publication of EP1040308B1 publication Critical patent/EP1040308B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F26B21/08—Humidity
    • F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
    • 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
    • F26B21/10—Temperature; Pressure

Definitions

  • the present invention relates to a method and a device for drying water-soluble paints applied by means of spray guns in a work area.
  • Solvent-based paints are traditionally used in the paint processing industry because they are easy and inexpensive to process. However, these solvent-based paints lead to considerable environmental pollution, since the solvent escapes into the atmosphere during the drying process. Although it would be technically possible to filter out the solvents using suitable filters, this leads to an undesired increase in the painting costs, since such filters are technically complex.
  • a system for processing water-soluble paints is shown in EP 0 798 051 A1.
  • the system includes an automated air filter and air drying system for quick drying of a painted object.
  • US-A-4,687,686 which is considered the closest prior art, shows a device for regulating the climate in a spray booth.
  • the spray booth comprises a chamber for the objects to be painted and an air circulation system for supplying the chamber with ambient air or circulated air.
  • the air circulation system of the spray booth includes a system for controlling the temperature of the air supplied to regulate the relative humidity in the chamber.
  • the present invention therefore has the problem of providing a method and a device with which the energy costs incurred in the coating processing can be considerably reduced in comparison with previously known methods, the quality of the coating being improved at the same time.
  • the above problem is solved by a method and a device according to which the air in a closed work area (the painting booth) is continuously adsorptively dried before and during the application of the lacquer.
  • a closed work area the painting booth
  • the air humidity in the work area is below that of the ambient air, as a result of which the water is removed from the paint to be applied even during the spraying process.
  • Another advantage of the method and the corresponding device according to the invention is that particularly homogeneous layers of lacquer can be produced, since the continuous drying of the air in the work area not only leads to water removal in the lacquer, but in particular also dries the surface to be lacquered, ie water-free makes. This leads to an increase in the homogeneity of the lacquer layer during the spraying process, since the Arrange color pigments more homogeneously on the surface to be painted, the drier it is.
  • the air in the work area is dried by means of an adsorption rotary dehumidifier which has an adsorption line connected to the work area and a separate regeneration circuit.
  • an adsorption rotary dehumidifier which has an adsorption line connected to the work area and a separate regeneration circuit.
  • the device according to the invention has a circulation and / or pre-cooling arrangement which circulates and cools the air in the work area.
  • the cooling of the air initially leads to an increase in the relative humidity, but to a decrease in the dew point of the air. This allows a particularly effective, subsequent drying of the air to the desired relative humidity.
  • the device according to the invention comprises a working area 10, which can preferably have the shape of a painting booth known per se.
  • a working area 10 in addition to the objects to be painted (for example motor vehicle body parts), there are also the usual spraying devices (spray guns) used in the painting industry or in small paint shops, with which the paint is applied to the parts to be painted. Since these parts are sufficiently known to the person skilled in the art, a separate illustration is dispensed with.
  • the work area 10 is isolated from the surroundings in order to largely prevent air exchange between the air 5 in the work area 10 and the ambient air.
  • FIG. 1 also shows the drying system 20, 30 shown schematically. In the embodiment shown in FIG. 1, it comprises an adsorption dryer 20, and a circulating and pre-cooling arrangement 30, which are described below.
  • an adsorption dryer 20 is used, which is connected to the working area 10 via an adsorption line 21.
  • the adsorption dryer 20 uses a continuously operating adsorption rotor 20 '(see FIG. 2), which sucks in fresh air, dries it and introduces it into the work area 10 via the adsorption line 21.
  • the adsorption dryer 20 has a separate regeneration circuit 29, which - as described in more detail below - regenerates the adsorption rotor 20 '.
  • the adsorption dryer 20 is described below with reference to FIG. 2.
  • the adsorption dryer 20 consists of an adsorption rotor 20 'which is provided with axially directed air channels (not shown). These ensure a laminar flow of air through the dryer with a low pressure drop.
  • the air to be dehumidified is drawn in by an adsorption fan 24 through the adsorption rotor 20 'via a pre-filter 22.
  • a separately provided regeneration area is provided which removes the moisture accumulated in the rotor and releases it to the outside.
  • the air passed through the regeneration circuit 29 is drawn in through the regeneration section by a regeneration fan 30, having previously been cleaned by a filter 26 and subsequently raised to the necessary process temperature by a heater 28.
  • the adsorption rotor 20 essentially consists of a slowly rotating rotor made of a ceramic composite material which is permanently impregnated with either silica gel or lithium chloride.
  • Silica gel is currently preferred as the adsorbent, since it is physiologically harmless and not water-soluble, and can therefore neither be washed out nor discharged with the air stream.
  • the described arrangement of adsorption and regeneration areas results in a continuous operation of the adsorption dryer, since the adsorption process runs parallel to the regeneration process.
  • a circulation and pre-cooling arrangement 30 is provided, which is connected to the working area 10 via a circulation and pre-cooling circuit 32.
  • the circulation and Pre-cooling arrangement 30 firstly ensures air exchange in the work area 10 and optionally pre-cooling.
  • the circulation and pre-cooling arrangement 30 can also have filter elements (not shown) that filter the air in the work area 10.
  • the process according to the invention for processing and, in particular, drying paints and the corresponding device have significant advantages over the known methods used hitherto, since on the one hand they make the subsequent drying of water-soluble paints with hot air unnecessary, and on the other hand to a more homogeneous paint layer on the paint surface.
  • the paint pigments arrange themselves more homogeneously on the surface to be painted, the drier the surface to be painted is.
  • the dew point of the surrounding air must be at least 15 ° C in order to achieve an effective anchoring of the picments on the surface. If it is intended to paint steel, for example, it must be taken into account that the dry bulb temperature of the steel surface is always lower than that of the ambient air adjacent to it. This inevitably creates a cooling effect, which leads to aerosol deposition on the steel surface, even if the resulting water film is not visible to the naked eye.
  • FIG. 3 shows the corrosion curve of steel as a function of the relative air humidity (the ordinate shows the increase in weight as a measure of the susceptibility to corrosion).
  • Humidity of more than 60% increases the corrosion curve steeply, while rust formation no longer occurs if the humidity is below 30%. This means that no aerosol film has deposited on the steel.
  • the coating is carried out at a relative humidity of less than 60%, or better still less than 30%, this enables a very homogeneous arrangement of the color pigments on the steel.
  • a painting booth 10 is used which, according to the invention, is circulated with 20,000 m 3 / h or 25,000 m 3 / h air.
  • the dried fresh air portion supplied via the adsorption dryer 20 should be approximately 10%.
  • 2,000 m 3 / h or 2,500 m 3 / h fresh air are passed through an adsorption dehumidifier (available, for example, from ARKU-Verfahrenstechnik GmbH, Olching, Germany) and brought to a low dew point.
  • an adsorption dehumidifier available, for example, from ARKU-Verfahrenstechnik GmbH, Olching, Germany
  • the circulating and pre-cooling arrangement 30 provides for pre-cooling of the air in the work area 10. If, for example, the prevailing conditions in summer, the following results:
  • T is the temperature
  • RH is the relative humidity
  • W is the water load
  • TP is the dew point
  • the adsorption dryer is provided as a separate element (separate from the circulating and pre-cooling arrangement).
  • an integrated device can also be provided.
  • the method and the corresponding device can be used not only for water-based paints, but also for solvent-based paints. If the method according to the invention and the corresponding device are used for solvent-based paints, this leads to the fact that drying by hot air, which is still necessary, can be considerably reduced; in this case it will Process according to the invention, as it were, used as a predrying process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Drying Of Solid Materials (AREA)
  • Coating Apparatus (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (18)

  1. Procédé pour sécher des peintures dans une zone de travail (10), qui comprend les étapes suivantes :
    a) mise à disposition d'une zone de travail (10), hermétiquement fermée et remplie d'air ;
    b) application de la peinture sur une surface à revêtir, caractérisé en ce que
    c) l'air se trouvant dans la zone de travail (10) est, avant et pendant l'application, séché en continu par adsorption, de façon que l'eau soit extraite de la peinture, déjà pendant l'application.
  2. Procédé selon la revendication 1, dans lequel l'humidité relative de l'air dans l'étape de séchage est abaissée à moins de 25 %.
  3. Procédé selon la revendication 1, dans lequel l'humidité relative de l'air dans l'étape de séchage est abaissée à moins de 10 %.
  4. Procédé selon la revendication 1, dans lequel l'humidité relative de l'air dans l'étape de séchage est abaissée à environ 6 %.
  5. Procédé selon l'une des revendications 1 à 4, qui avant l'étape de séchage de l'air dans la zone de travail (10) comprend en outre l'étape de pré-refroidissement de l'air.
  6. Procédé selon la revendication 5, dans lequel l'air est, dans l'étape de pré-refroidissement, refroidi à moins de 20 degrés Celsius.
  7. Procédé selon la revendication 5, dans lequel l'air est, dans l'étape de pré-refroidissement, refroidi à moins de 15 degrés Celsius.
  8. Procédé selon la revendication 5, dans lequel l'air, dans l'étape de pré-refroidissement, est refroidi à environ 10 degrés Celsius.
  9. Procédé selon l'une des revendications 1 à 8, qui comprend en outre l'étape de recirculation continue de l'air dans la zone de travail (10).
  10. Procédé selon la revendication 9, dans lequel la recirculation et le séchage de l'air est réalisé à l'aide d'un système de recirculation d'air en circuit fermé, disposé à l'extérieur de la zone de travail (10), et qui comprend en outre l'étape d'introduction, par mélange, d'une certaine proportion d'air frais.
  11. Procédé selon la revendication 10, dans lequel le rapport de l'air en recirculation à l'air frais est de 90:10.
  12. Procédé selon la revendication 10, dans lequel le rapport de l'air en recirculation à l'air frais est de 60:40.
  13. Procédé selon la revendication 10, dans lequel le rapport de l'air en recirculation à l'air frais est inférieur à 50:50.
  14. Appareillage pour sécher des peintures dans une zone de travail (10), qui comprend :
    a) une zone de travail (10) hermétiquement fermée, remplie d'air ;
    b) un système d'application de peinture, pour appliquer la peinture sur une surface à revêtir ; et
    c) un système de séchage (20, 30), caractérisé en ce que
    d) le système de séchage (20, 30) est un séchoir par adsorption (20), qui est disposé de façon qu'il sèche par adsorption l'air se trouvant dans ladite zone de travail (10) avant et pendant l'utilisation du système d'application de la peinture, de façon que l'eau soit déjà extraite de la peinture pendant l'application.
  15. Appareillage selon la revendication 14, dans lequel le séchoir par adsorption (20) comprend en tant qu'agents adsorbants du gel de silice ou du chlorure de lithium.
  16. Appareillage selon la revendication 14 ou 15, dans lequel le séchoir par adsorption (20) comprend un rotor à adsorption (20'), qui est constitué d'un matériau composite céramique et est imprégné de l'adsorbant.
  17. Appareillage selon les revendications 14 à 16, dans lequel le séchoir par adsorption (20) dispose d'une canalisation d'adsorption (21) et d'un circuit distinct de régénération (29).
  18. Appareillage selon l'une des revendications 14 à 16, dans lequel le système de séchage (20, 30) dispose en outre d'un dispositif (30) de recirculation et de pré-refroidissement.
EP98965842A 1997-12-17 1998-12-16 Dispositif et procede pour secher des peintures Expired - Lifetime EP1040308B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19756194A DE19756194B4 (de) 1997-12-17 1997-12-17 Lackverarbeitungsvorrichtung und -verfahren
DE19756194 1997-12-17
PCT/EP1998/008240 WO1999031449A1 (fr) 1997-12-17 1998-12-16 Procede et dispositif pour traiter des peintures

Publications (2)

Publication Number Publication Date
EP1040308A1 EP1040308A1 (fr) 2000-10-04
EP1040308B1 true EP1040308B1 (fr) 2003-09-10

Family

ID=7852315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98965842A Expired - Lifetime EP1040308B1 (fr) 1997-12-17 1998-12-16 Dispositif et procede pour secher des peintures

Country Status (4)

Country Link
EP (1) EP1040308B1 (fr)
AT (1) ATE249609T1 (fr)
DE (2) DE19756194B4 (fr)
WO (1) WO1999031449A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015214706A1 (de) 2015-07-31 2017-02-02 Dürr Systems Ag Behandlungsanlage und Verfahren zum Behandeln von Werkstücken
DE102015214711A1 (de) 2015-07-31 2017-02-02 Dürr Systems Ag Behandlungsanlage und Verfahren zum Behandeln von Werkstücken

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173924A (en) * 1978-03-01 1979-11-13 Schweitzer Industrial Corporation Paint spray booth with air supply system
JPS5913267B2 (ja) * 1978-07-12 1984-03-28 日産自動車株式会社 塗装ブ−ス
US4413427A (en) * 1981-07-29 1983-11-08 Aer Corporation Fuel control system for dryer
DE3336048C2 (de) * 1983-10-04 1985-08-29 Klaus 8066 Bergkirchen Oschmann Verfahren und Vorrichtung zum Entfeuchten eines Trockengases
US4687686A (en) * 1985-10-28 1987-08-18 George Koch Sons, Inc. Spray booth with climate regulation system
JP2715332B2 (ja) * 1990-06-28 1998-02-18 富士写真フイルム株式会社 乾式除湿機を用いた露点調整方法
DE9109134U1 (de) * 1991-07-24 1991-10-02 Herrmann, Johannes, 8490 Cham Lackier- und Trocknungskabine
JPH067635A (ja) * 1992-06-24 1994-01-18 Hiroshima Gas Kaihatsu Kk 除湿及び加温機能付き塗装室用有機溶剤除去装置
US5709038A (en) * 1993-09-24 1998-01-20 Optimum Air Corporation Automated air filtration and drying system for waterborne paint and industrial coatings
DE19644717A1 (de) * 1996-10-28 1998-04-30 Schlierbach Gmbh Verfahren zum Trocknen von dünnen Schichten sowie Vorrichtung zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
ATE249609T1 (de) 2003-09-15
WO1999031449A1 (fr) 1999-06-24
DE59809597D1 (de) 2003-10-16
DE19756194A1 (de) 1999-07-01
DE19756194B4 (de) 2006-06-08
EP1040308A1 (fr) 2000-10-04

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