EP0072822A1 - Procede et dispositif de peinture au pistolet - Google Patents

Procede et dispositif de peinture au pistolet

Info

Publication number
EP0072822A1
EP0072822A1 EP82900538A EP82900538A EP0072822A1 EP 0072822 A1 EP0072822 A1 EP 0072822A1 EP 82900538 A EP82900538 A EP 82900538A EP 82900538 A EP82900538 A EP 82900538A EP 0072822 A1 EP0072822 A1 EP 0072822A1
Authority
EP
European Patent Office
Prior art keywords
zone
inert gas
gas atmosphere
spray
solvent
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.)
Ceased
Application number
EP82900538A
Other languages
German (de)
English (en)
Inventor
Arno Lauke
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.)
BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben AG
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 BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Publication of EP0072822A1 publication Critical patent/EP0072822A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/49—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for solvents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/07—Hoods

Definitions

  • the invention relates to a spray painting process with spraying tools arranged in a closed spray booth; in which the atmosphere enriched with solvents is drawn off and a substantial proportion is returned to the spray zone and to an arrangement for carrying out such a method.
  • a method according to the preamble of the main claim emerges from DE-OS 27 1o 254.
  • the proportion of the returned air can be up to 100% when the spray guns are not working. If the spray guns are in operation, the proportion of air returned is reduced.
  • a mixing device is provided for dividing the exhaust air flow, which consists of a baffle plate, an actuation and a control.
  • the control device can be set so that a maximum solvent concentration in the circulating air is not exceeded in the work space. In the known method, there is therefore no recovery of the solvents, but more or less exhaust air from the spray booth is returned to the spray booth depending on the solvent concentration.
  • the invention is based on the object to reduce the problems encountered when using solvent-based paints and to provide a spray painting process in which the problems of metering, the recovery of materials, occupational hygiene and environmental conditions are improved with the same high quality standard.
  • This object of the invention is based on the consideration that it must be possible to erz in the actual spray zone of a Spri tzlacki driving maintain an inert gas atmosphere which, when enriched with vaporous solvents in a certain volume fraction, can be removed, in which case the solvents are removed from the inert gas atmosphere and the essentially solvent-free inert gas atmosphere is removed or returned to the circuit.
  • the proposal for the invention is based on the consideration that when an inert gas atmosphere is used without the risk of explosion, the proportion of solvent in the atmosphere is increased considerably. can and that the handling of this mixture containing inert gas and solvent is possible without risk, so that such a mixture can be processed in all conceivable treatment processes without the need for explosion protection measures and devices.
  • the solvents are used as auxiliaries in painting technology and serve to improve the atomization and to achieve certain properties of the wet paint film. After application of the lacquer, these solvents have fulfilled their task and have so far been removed, while it is now proposed according to the invention that the solvents be concentrated, the fact that spray zones will be fully automated in the future continues to take this consideration into account.
  • the cheapest inert gas available is flue gas, which is generated during the heating of the spray zone and in general the painting systems and for carrying out the drying processes.
  • flue gas In the dried and desulphurised state it is alternated with solution enriched and depleted, so that a constant circulation of this inert gas is possible.
  • the lacquer In the spray zone, the lacquer is applied at an elevated temperature, which is also possible because such high temperatures can be achieved through the surrounding inert gas atmosphere without the risk of explosion. At the same time, the higher temperature of the inert gas atmosphere leads to an increased absorption capacity for the vaporous solvents.
  • the spraying zone is immediately followed by the drying zone, preferably in a closed pass, and that an inert gas atmosphere is also maintained in the drying zone.
  • An essential feature of the invention is further to be seen in the fact that the temperature of the inert gas atmosphere introduced from the spray zone into the drying zone is further heated during the transition from the spray zone to the drying zone, preferably to twice the temperature, so that the absorbability of the inert gas atmosphere in the the drying zone is introduced is further increased.
  • the inert gas atmosphere in the drying zone is preferably conducted in countercurrent to the components conveyed in the drying zone.
  • the inert gas atmosphere is conducted in a closed circuit, ie in this circuit there is a heat exchange zone provided in which the solvent portions are eliminated by cooling the inert gas atmosphere, so that the inert gas atmosphere is ready for absorption again.
  • an inert gas atmosphere in the spray zone also means that the solids can be removed from the spray zone in an explosion-proof manner. This is possible by using an entrainer or by solids filters that are destroyed after use.
  • Fig. 1 is a schematic drawing of the process flow according to the invention and in
  • Fig. 2 is a schematic drawing of the removal of the solids.
  • 1 denotes the spray zone
  • 2 the drying zone
  • 3 the treatment zone.
  • Spray zone 1 and drying Zone 2 are located in a closed tunnel-shaped system 4, which are secured at their entrance and exit 6 by a suction device shown by arrows 7 and 8.
  • the spray zone 1 there is a temperature of 70 ° C., while in the drying zone 2 a temperature of 140 ° C. is maintained.
  • the inert gas is guided in full lines, which are designated by 9 in the drawing.
  • This inert gas is introduced into the system 4 at 10 and from there it arrives in the actual spray zone 1, in which the inert gas atmosphere free of solvent is suitable for absorbing the solvents released during the spraying process by the spraying tools shown schematically at 11.
  • An inert gas buffer is shown at 12 and a paint supply line at 111.
  • An analysis control device 14 controls the extraction of the inert gas atmosphere in such a way that a certain degree of saturation of the inert gas atmosphere is maintained in the spray zone.
  • These control pulses are applied by the analysis control unit of a gas pump 15, which draws the inert gases at 16 from the spray zone 1, heats them up further via a preheater 17 switched into the line 9, and leads them to the drying zone at 18, from which the gases are then at 19, i.e. in countercurrent to the components to be dried.
  • a quantity measuring and control device can then be switched on in line 9 to preheater 17.
  • the solvent-containing inert gas enters a cooler 24 which cools the inert gas atmosphere, for example to 5 ° C., so that, as indicated by arrow 23a, further solvents are eliminated and the inert gas atmosphere is thus almost solvent-free.
  • a feed pump 25 then conveys the solvent-free inert gas atmosphere via the inlet 22 and the line 9 to the inlet 10.
  • a line 9a can be provided, which branches off from line 9 and opens into system 4 near the end of the drying zone, as is shown by arrow 26. In this way, a negative pressure in this discharge area 6 of the system 4 is avoided by removing the hot inert gases at 19.
  • a section through the spray zone 1 is also shown schematically and here it should be made clear that the so-called entraining agents which are supplied at 27 and 28 are used to remove the solid particles of the paint.
  • the mixture of solid particles and so-called entraining agent enters a storage container 29, from which the entraining agent saturated with solid particles can be discharged, controlled via an analysis control device 30.
  • a level controller for the tank contents is designated and it is possible to discharge continuously enriched entrainer via a discharge line 36 and to introduce fresh entrainer continuously via the feed line 37 and thereby keep the solid concentration in the line 32 constant, with corresponding measuring regulators 33 and preheaters 34 can be switched on. Since there is also an inert gas atmosphere supplied via line 38 in the tank 29, this system can be handled without problems.
  • the O 2 content of the inert gas atmosphere is continuously monitored.
  • the gas flow in the circuit is provided in such a way that the cleaned inert gas flow is introduced into the outer zones, so that only a solvent-free inert gas can escape at the ends of the system 4 at a slight excess pressure.
  • Solvents and solids can be recovered and reintroduced into the process after appropriate preparation.
  • the preparation of solvents and cleavage products is relatively easy to achieve by filtration and rectification. If several capacitors are used, the solvents and fission products are already separated according to the boiling range. Filtration, distillation and extraction steps are required for the solid particles.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Dans ce procede, l'utilisation de gaz inertes permet la recuperation de la peinture ce qui se traduit par une hygiene de travail amelioree et une pollution diminuee. Les gaz inertes enrichis de solvants gazeux sont aspires, liberes des solvants et reintroduits dans le circuit.
EP82900538A 1981-02-23 1982-02-11 Procede et dispositif de peinture au pistolet Ceased EP0072822A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3106605A DE3106605C2 (de) 1981-02-23 1981-02-23 Spritzlackierverfahren und Anordnung zur Durchführung desselben
DE3106605 1981-02-23

Publications (1)

Publication Number Publication Date
EP0072822A1 true EP0072822A1 (fr) 1983-03-02

Family

ID=6125494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82900538A Ceased EP0072822A1 (fr) 1981-02-23 1982-02-11 Procede et dispositif de peinture au pistolet

Country Status (5)

Country Link
US (1) US4448812A (fr)
EP (1) EP0072822A1 (fr)
JP (1) JPS58500277A (fr)
DE (1) DE3106605C2 (fr)
WO (1) WO1982002843A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4600608A (en) * 1981-10-17 1986-07-15 Lucas Industries Surface coating apparatus and method
DE3833384A1 (de) * 1988-10-01 1990-04-12 Bayer Ag Verfahren zum zurichten von leder
MX9602147A (es) * 1995-07-31 1997-08-30 Ransburg Corp Metodo para la reduccion de cov y camara de aplicacion de pintura en aerosol que incorpora este metodo.
DE102010051679A1 (de) 2010-11-17 2012-05-24 Daimler Ag Lackieranordnung und Lackierverfahren
DE102014008052A1 (de) * 2014-05-28 2015-12-17 Eisenmann Ag Anlage und Verfahren zum Behandeln von Gegenständen

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848353A (en) * 1954-10-21 1958-08-19 Edward O Norris Method and apparatus for spraying articles including separation and recirculation of coating material
US3015576A (en) * 1957-05-15 1962-01-02 Du Pont Degreasing and coating apparatus and process
US3395972A (en) * 1965-05-20 1968-08-06 Universal Oil Prod Co Method of cleaning and purifying particle laden discharge streams
US3853581A (en) * 1972-06-02 1974-12-10 Air Ind Method of coating articles with electrostatically charged particles
CH611811A5 (en) * 1976-03-10 1979-06-29 Waelti Gebrueder Ag Method for ventilating paint spraying systems and paint spraying system for carrying out the method
DE2723988A1 (de) * 1977-05-27 1978-11-30 Otto Duerr Gmbh & Cco Verfahren und vorrichtung zum abscheiden von lackresten und loesemitteln aus der abluft von spritzkammern o.dgl.
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
US4266504A (en) * 1979-08-10 1981-05-12 Deere & Company Paint spraying assembly
US4261707A (en) * 1979-09-12 1981-04-14 Schweitzer Industrial Corp. Process and system for elimination of paint solvent vapors
US4344381A (en) * 1980-12-29 1982-08-17 Allied Tube & Conduit Corporation Apparatus for continuously electrostatically coating an elongated object

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8202843A1 *

Also Published As

Publication number Publication date
DE3106605C2 (de) 1983-02-03
DE3106605A1 (de) 1982-09-02
JPS58500277A (ja) 1983-02-24
US4448812A (en) 1984-05-15
WO1982002843A1 (fr) 1982-09-02

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19820312

AK Designated contracting states

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Effective date: 19841005

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LAUKE, ARNO