EP2083235B1 - Dispositif de séchage d'objets, en particulier de carrosseries de véhicule peintes - Google Patents

Dispositif de séchage d'objets, en particulier de carrosseries de véhicule peintes Download PDF

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Publication number
EP2083235B1
EP2083235B1 EP20090000256 EP09000256A EP2083235B1 EP 2083235 B1 EP2083235 B1 EP 2083235B1 EP 20090000256 EP20090000256 EP 20090000256 EP 09000256 A EP09000256 A EP 09000256A EP 2083235 B1 EP2083235 B1 EP 2083235B1
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EP
European Patent Office
Prior art keywords
gas exchange
exchange chamber
gas
piston
inert gas
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 - Fee Related
Application number
EP20090000256
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German (de)
English (en)
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EP2083235A1 (fr
Inventor
Werner Swoboda
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.)
Eisenmann SE
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Eisenmann SE
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Publication date
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Publication of EP2083235A1 publication Critical patent/EP2083235A1/fr
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Expired - Fee Related legal-status Critical Current
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/14—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by trays or racks or receptacles, which may be connected to endless chains or belts
    • 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
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • 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
    • F26B25/008—Seals, locks, e.g. gas barriers or air curtains, for drying enclosures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/12—Vehicle bodies, e.g. after being painted

Definitions

  • the invention relates to a device for drying objects, in particular painted vehicle bodies, according to the preamble of patent claim 1.
  • drying is meant here all processes by which a coating material is transferred from the state after application to the final state, be it by removal of solvents, melting, crosslinking or the like.
  • the inlet lock area substantially comprises three chambers: a first, which is filled with normal atmosphere and the freshly coated objects are supplied from the coating station.
  • a second chamber is partially below the first chamber, is connected thereto via a large-area opening through which the coated articles can be lowered, and contains an inert gas atmosphere whose density is greater than that of the outer normal atmosphere.
  • a third lock chamber is in turn above the second lock chamber approximately at the level of the first lock chamber and adjacent to this and is also connected to the second lock chamber via a large-area opening. It also contains an inert gas atmosphere and communicates with the inert gas atmosphere within the drying tunnel. The coated objects are guided through these lock chambers in the order listed.
  • a similar, but from the now dried objects in the reverse direction traversed outlet lock area is located at the end of the drying tunnel.
  • Inert gases in particular nitrogen, CO 2 , noble gases or other gases may be his, in which the content of the drying adversely affecting noxious gas component is below a predetermined limit.
  • nitrogen is a noxious gas component, and their concentration should be below 1 percent by volume.
  • a device of the type mentioned is from the US 2002/0006464 A1 known.
  • the items to be dried there are primarily food or drugs.
  • the vacuum pump provided there is used for vacuum drying, whereby pressures of 20 to 100 mbar are achieved.
  • a connection with the saving of inert gas does not exist.
  • WO 2008/098662 A1 describes a drying tunnel with locks, which is filled with inert gas.
  • the lock volume can be changed.
  • Object of the present invention is to develop a device of the type mentioned so that with the least possible expenditure on equipment, the inert gas consumption is further reduced.
  • a vacuum pump is used at the inlet of the drying tunnel.
  • the inlet lock area becomes a vacuum lock.
  • This has the advantage that their gas exchange chamber can be virtually completely freed from the atmosphere therein, even when there is an object.
  • the disadvantage here is that the walls of the gas exchange chamber must be made relatively stable in order to withstand the pressure applied from the outside after evacuation can.
  • the outlet of the drying tunnel is not also a vacuum lock used but one in which by the movement of a corresponding Part the atmosphere from the gas exchange chamber can be mechanically displaced.
  • This is possible at the outlet of the drying chamber with good success, because there is the displacement of the atmosphere in a state in which the gas exchange chamber is empty. Since the gas exchange chamber is not evacuated, its walls can be kept mechanically simpler and therefore cheaper.
  • the combination of a vacuum lock at the inlet and a "displacement lock" at the outlet is a solution that deals extremely sparingly with inert gas and nonetheless is relatively inexpensive to invest.
  • the gas exchange chamber of the inlet lock region can also be connectable to a buffer container for temporarily stored inert gas.
  • the inert gas which must be removed from the gas exchange chamber of the inlet lock area in a certain phase of the Naturalschleusungsvorganges, not to be discarded, but can be used again.
  • the device for changing the volume of the gas exchange chamber of the outlet lock region comprises a piston which is retractable into the gas exchange chamber and retractable therefrom.
  • the space which lies on the side opposite the gas exchange chamber of the outlet lock area side of the piston should be filled with inert gas. This is because, given its size, the piston can hardly be perfectly sealed against the walls of the gas exchange chamber, so there is always some gas leaking through it. This gas should not be a normal atmosphere but inert gas.
  • a valve can be arranged in the piston, with which a connection between the gas exchange chamber of the outlet lock area and the space on the opposite side of the piston can be established during extension of the piston.
  • the gas exchange chamber of the outlet lock area can be filled with inert gas.
  • a particularly advantageous embodiment of the invention is characterized in that a flushing device is provided, with which the atmosphere located in the gas exchange chambers of the inlet lock area and the outlet lock area can be mixed.
  • the atmosphere that is within the gas exchange chamber of the inlet lock area may be enriched with inert gas prior to evacuation, which would otherwise be uselessly lost. Due to this enrichment, this gas exchange chamber does not need to be evacuated as far as would be required without such a flushing device in order to achieve a certain maximum oxygen content. As a result, significantly shorter Abpump ceremonies and thus cycle times of the entire system can be achieved.
  • noxious gas concentration for example oxygen concentration
  • the noxious gas sensor also makes it possible to store quantities of gas which no longer meet the stringent requirements for the operation of the apparatus, but which still contain significantly less noxious gas than the ambient atmosphere for rinsing purposes in a buffer tank, the contents of which can be used in initial cycles of initial inerting is.
  • FIG. 1 a section of a paint shop for vehicle bodies 10 is shown in vertical section, which carries the reference number 1 in total.
  • This section comprises an inlet lock area 3 for a trocar tunnel 4, the drying tunnel 4 itself, which is only partially shown, and an outlet lock area 5.
  • the vehicle bodies 10 are, in FIG. 1 in the direction of the arrow 6 coming from a paint booth, not shown, through the inlet lock area 3, the drying tunnel 4 and the outlet lock area 5 moves, which is performed cyclically, at least in the lock areas 3, 5.
  • conveyor systems 7, 8, 9 which are not explained in greater detail are used, which are known to the person skilled in the art.
  • paint booth In the paint booth are in a known manner application devices with which automatically or by hand on the vehicle bodies 10 paint can be applied.
  • the paint booth in turn are preceded by other pretreatment stations that correspond to the state of the art.
  • the drying tunnel 4 is also in the state of the Built technology and contains suitable heating and irradiation facilities, with which the applied paint can be brought to dry or curing.
  • This is designed as a vacuum lock and comprises a gas exchange chamber 16, which can be closed at its two opposite end faces in each case by a motor-driven lifting gate 24 and 25 respectively.
  • the top wall of the gas exchange chamber 16 of the vacuum lock 3 is pierced by a working line 17 which leads to the inlet of a high-performance vacuum pump 18.
  • a discharge line 19 connects the outlet of the vacuum pump 18 with a gas line 20. Both to the right and to the left of the discharge point 19 of the discharge line 19 in the gas line 20 is a motor-controlled valve 21 and 22 respectively.
  • the gas line 20 leads via a further motor-operated valve 23 to the outlet lock area 5; Details will be explained below.
  • a buffer tank 15 for cached inert gas is connected via a bifurcated line 26 to the gas line 20, wherein in a branch 26 a of this line a pump 27 and in the other branch 26 b, a motor-operated valve 28 is located.
  • the outlet lock area 5 is designed as a "piston lock".
  • the name “piston lock” is explained by its now described structure:
  • the piston lock 5 also comprises a gas exchange chamber 31, which can be closed on both sides by a motor-driven lifting gate 32 or 33.
  • An outlet line 34 leads through the bottom of the piston lock 5 via a motor-operated valve 35 if necessary. Via a chimney to the outside atmosphere.
  • the ceiling of the Gausingsch 31 of the piston lock 5 is not stationary. Rather, it is formed by the lower end face of an upwardly open piston 36 in which a Check valve 37 is located.
  • the cross-section of the piston 36 is adapted to that of the gas exchange chamber 31, which thus has the function of an upwardly open cylinder.
  • the piston 36, by means of two lifting units 38, 39 in FIG. 1 are only hinted to be moved vertically.
  • an oxygen sensor 50 may be connected, which provides an oxygen content in the sucked gas entsprichendes output signal.
  • the oxygen sensor 50 may, for. Example, be a sensor that responds to the infrared absorption bands of oxygen molecules. Alternatively, it may be a solid oxygen sensor.
  • the oxygen sensor 50 determines that the oxygen content in the aspirated gas mixture is greater than the predetermined limit value, it causes a controller 51 of the system to open the valve 30 so much that in the suction lines 17 currently being used for supplying inert gas again the limit value for oxygen is below.
  • the controller 51 opens the motor-operated valve 22 and starts the pump 27 so that the oxygen-depleted gas still usable for flushing is pressed into the buffer tank 15. In the initial inertization, the purge gas can then escape from there by opening the valves 14, 28 of the working line 17 are supplied.
  • buffer containers 15 which contain different amounts of residual oxygen containing purge gas and are filled via separate pumps 27. They will then later be differently opened by the controller 51 according to the current value of the oxygen concentration at the plant inerting, and connected differently to the working line 17 by the control circuit 50 according to the progress of the inerting process via separate valves 28.
  • the above-mentioned gas line 20 opens at its left end in the drawing in the above the end face of the piston 36 and the top of a stationary ceiling of the housing of the piston lock 5 limited space.
  • the two outermost lift gates 24 and 33 of Appendix 1 are closed, as are the valves 13, 21, 22 and 30. Open, however, are the valves 14, 23 and 28. At this time, of course in the Appendix 1 no vehicle body 10.
  • the inerting process for example, begin with the fact that the gate 32, which connects the drying tunnel 4 with the gas exchange chamber 31 of the piston lock 5, is closed. By descending the piston 5, the normal atmosphere 31 located in the guest exchange chamber 31 is pushed out via the open valve 35. Now, the valve 35 is closed and the gate 32 is opened. By raising the piston 5, the normal atmosphere is sucked out of the drying tunnel 4 into the gas exchange space 31.
  • valves 13, 14 and 22 are closed; the valve 21 is opened.
  • a first vehicle body 10 can now enter the gas exchange chamber 10 of the vacuum lock 3 when the lift gate 24 is open.
  • the lifting gate 24 is brought into its closed position and then the gas exchange chamber 16 is pumped off via the working line 17 with the aid of the vacuum pump 18, the discharge of which escapes via the open valve 21 into the outside atmosphere.
  • valve 21 is closed; the valves 14 and 30 are opened. This has the consequence that the gas exchange chamber 16 is flooded from the reservoir 29 with inert gas until it reaches normal pressure.
  • the lifting gate 25 can be opened and the vehicle body 10 can be retracted into the already inertized drying tunnel 4, whereupon the lifting gate 25 is closed again. Now the valves 14 and 30 are closed and the valve 22 is opened. It can now with the help of the pumps 18 and 27, the inert gas is pumped out of the gas exchange chamber 16 of the vacuum lock 3 and cached in the buffer tank 15.
  • valve 22 is closed and the valve 13 is opened, so that the gas exchange chamber 16 of the vacuum lock 3 can be filled with normal atmosphere.
  • a vehicle body 10 is retracted once again with the valve 13 closed via the open lifting gate 24 in the direction of the arrow 6 in the gas exchange chamber 16 of the vacuum lock 3. Then the gate 24 is closed.
  • the gas exchange space 16 is evacuated by means of the vacuum pump 18. Now the valve 21 is closed; the valves 14 and 28 are open. Unlike the first transfer, the gas exchange space 16 of the vacuum lock 3 is now not flooded with fresh inert gas from its reservoir 29 but from the buffer tank 15 with cached inert gas. At most, 30 so much high-purity inert gas is metered from the reservoir 29 by appropriate short-term opening of the valve, that the permissible residual oxygen content in the inert gas atmosphere, which is located in the gas exchange chamber 16 is not exceeded. Thereafter, the valves 14 and 28 are closed again.
  • the lift gate 25 can be opened and the vehicle body 10 can be retracted into the drying tunnel 4.
  • the valves 22 and 28 are opened and the gas exchange chamber 16 of the vacuum lock 3 evacuated by means of the vacuum pump 18 and the pump 27, wherein the pumped inert gas is temporarily stored in the buffer tank 15.
  • valves 22 and 28 are closed and the valve 13 is opened, so that the gas exchange chamber 16 can be filled via the gas line 11 with normal atmosphere.
  • the passing through the vacuum lock 3 in the drying tunnel 4 vehicle bodies 10 are there in a known manner with electromagnetic radiation, preferably UV radiation, and optionally. Applied to heat, so that the applied coating cures.
  • FIG. 1 the gas exchange chamber 31 of the piston lock 5 is still occupied by a vehicle body 10. This must first be moved out, for which purpose the lifting gate 33 is opened and closed again after moving out of the vehicle body 10. Now, the valve 35 is opened in the outlet 34 and the piston 36 by means of the lifting units 38 * 39 pressed down, whereby the normal atmosphere of the gas exchange chamber 31 of the piston lock 5 is removed. In the space above the end face of the piston 36 flows with open valves 23 and 30 from the reservoir 29 fresh inert gas.
  • the piston 36 After closing the valves 30, 23 and 35, the piston 36 is raised. In this case, the check valve 37 opens in the end wall of the piston 36 so that inert gas from the space above this end wall can flow into the gas exchange chamber 31 of the piston lock 5.
  • FIG. 2 is the same Annex 1 as in FIG. 1 shown. However, this Appendix 1 has now been supplemented by a purging device, which is provided overall with the reference numeral 40 and to which the following description is limited.
  • This purging device 40 comprises two gas lines 41, 42 which connect the gas exchange spaces 16 and 31 of the vacuum lock 3 and the piston lock 5 with each other.
  • upper gas line 41 is near the Vacuum lock 3, a first motor-operated valve 43 and in the vicinity of the piston lock 5, a second motor-operated valve 44.
  • lower gas line 42 are in the vicinity of the vacuum lock 3, a first motor-operated valve 45 and in the vicinity of the piston lock 5, a second motor-operated valve 46.
  • a pump 47 is also arranged in the line 42.
  • the mouth points of the two lines 41 and 42 in the gas exchange chambers 16, 31 of the vacuum lock 3 and the piston lock 5 are as far away from each other as possible.
  • the operation of the purging device 40 is as follows:
  • the gas exchange chamber 16 is evacuated with the aid of the vacuum pump 18 at this residual oxygen content, it is sufficient to produce only about tenth part of the normal air pressure in the gas exchange chamber 16. This means that the time to reach the final vacuum when using the purging device 40 of the FIG. 2 is reduced by about 30%, assuming that the same vacuum pump 18 is used in both cases.

Claims (7)

  1. Dispositif de séchage d'objets, en particulier de carrosseries peintes (10) de véhicules, avec
    a) un tunnel de séchage (4), dont l'espace intérieur est rempli d'une atmosphère de gaz inerte ;
    b) une zone (3) de sas d'entrée, qui est placée en amont du tunnel de séchage (4), qui comprend au moins une chambre (16) d'échange de gaz et qui sépare l'atmosphère de gaz inerte régnant à l'intérieur du tunnel de séchage (4) de l'atmosphère de gaz normale extérieure ;
    c) une zone (5) de sas de sortie, qui est placée en aval du tunnel de séchage (4), qui comprend au moins une chambre (31) d'échange de gaz et qui sépare l'atmosphère de gaz inerte régnant à l'intérieur du tunnel de séchage (4) de l'atmosphère normale extérieure ;
    d) un système de transport (7, 8, 9), qui dirige les objets à travers la zone (3) de sas d'entrée, le tunnel de séchage (4) et la zone (5) de sas de sortie ;
    e) un récipient (29) de stockage de gaz inerte, qui peut être relié aux chambres (16, 31) d'échange de gaz de la zone (3) de sas d'entrée et de la zone (5) de sas de sortie ;
    sachant que
    f) la chambre (16) d'échange de gaz de la zone (3) de sas d'entrée peut être reliée à une pompe à vide (18), dont la sortie peut être reliée à l'atmosphère extérieure ;
    caractérisé en ce que
    g) la chambre (31) d'échange de gaz de la zone (5) de sas de sortie présente un dispositif (36, 38, 39) qui est à même, afin de refouler l'atmosphère contenue dans la chambre (31) d'échange de gaz, de modifier le volume de la chambre (31) d'échange de gaz entre une valeur maximale et une valeur minimale qui est sensiblement égale à zéro.
  2. Dispositif selon la revendication 1, caractérisé en ce que la chambre (16) d'échange de gaz de la zone (3) de sas d'entrée peut être au choix également reliée à un récipient tampon (15) pour du gaz inerte temporairement stocké.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le dispositif pour modifier le volume de la chambre (31) d'échange de gaz de la zone (5) de sas de sortie comprend un piston (36) qui peut être rentré dans la chambre (31) d'échange de gaz et en être ressorti.
  4. Dispositif selon la revendication 3, caractérisé en ce que l'espace qui se situe sur le côté du piston (36) qui fait face à la chambre (31) d'échange de gaz de la zone (5) de sas de sortie peut être rempli de gaz inerte.
  5. Dispositif selon la revendication 4, caractérisé en ce qu'une soupape (37) est disposée dans le piston (36), laquelle permet, lors de la sortie du piston (36), de réaliser une liaison entre la chambre (31) d'échange de gaz de la zone (5) de sas de sortie et l'espace sur le côté du piston (36) qui fait face à cette chambre.
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un dispositif de circulation (40) qui permet de mélanger les atmosphères présentes dans les chambres (16, 31) d'échange de gaz de la zone (3) de sas d'entrée et de la zone (5) de sas de sortie.
  7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce qu'un capteur (50) de gaz nocif est disposé dans un tronçon des conduites à travers lesquelles s'écoule le gaz, de préférence dans une conduite d'échange de gaz (17).
EP20090000256 2008-01-22 2009-01-10 Dispositif de séchage d'objets, en particulier de carrosseries de véhicule peintes Expired - Fee Related EP2083235B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810005584 DE102008005584B3 (de) 2008-01-22 2008-01-22 Vorrichtung zum Trocknen von Gegenständen, insbesondere von lackierten Fahrzeugkarosserien

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EP2083235A1 EP2083235A1 (fr) 2009-07-29
EP2083235B1 true EP2083235B1 (fr) 2011-07-13

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CN103398558A (zh) * 2013-07-24 2013-11-20 深圳市信宇人科技有限公司 全自动组合模块新能源材料真空烘烤方法及真空烘烤线
EP4036506A3 (fr) * 2015-07-31 2022-10-12 Dürr Systems AG Installation de traitement et procédé de traitement de pièces
US11740021B2 (en) 2015-07-31 2023-08-29 Dürr Systems Ag Treatment installation and method for treating workpieces

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DE102010002179A1 (de) 2010-02-22 2011-08-25 Dürr Systems GmbH, 74321 Schleuse zum Überführen eines Werkstücks zwischen einem Außenraum und einem Innenraum eines Werkstückbehandlungsbereichs
CN106931726B (zh) * 2017-03-23 2019-03-05 河北工业大学 一种锂离子电池电芯的烘烤干燥工艺
CN108058286A (zh) * 2018-01-10 2018-05-22 宁波得晴电器科技有限公司 塑料粒子干燥设备
CN117490363A (zh) * 2023-12-27 2024-02-02 四川易华智源科技有限公司 一种电子元器件加工用高效烘烤装置

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FR2659133B1 (fr) * 1990-03-05 1993-05-21 Blaizat Claude Procede de deshydratation totale ou partielle de produits vegetaux, son dispositif de deshydratation et le produit obtenu.
DE19804386C2 (de) 1998-02-04 1999-12-30 Ttp Ingenieurbuero Verfahren und Vorrichtung zur Trocknung oder Wärmebehandlung von Produkten, insbesondere mit Hilfe von Mikrowellenstrahlung, und damit hergestellte Bananenchips und Bananenpulver
DE102004023537B4 (de) * 2003-07-24 2007-12-27 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zur Aushärtung einer aus einem Material, das unter elektromagnetischer Strahlung aushärtet, insbesondere aus einem UV-Lack oder aus einem thermisch aushärtenden Lack, bestehenden Beschichtung eines Gegenstandes
DE102004025526B4 (de) * 2004-05-25 2006-04-13 Eisenmann Maschinenbau Gmbh & Co. Kg Vorrichtung zum Trocknen von Gegenständen, insbesondere von lackierten Fahrzeugkarosserien
DE102004025525B3 (de) 2004-05-25 2005-12-08 Eisenmann Maschinenbau Gmbh & Co. Kg Verfahren und Vorrichtung zum Trocknen von Gegenständen, insbesondere von lackierten Fahrzeugkarosserien
DE102007007478B3 (de) * 2007-02-15 2008-05-29 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Trocknen von Gegenständen, insbesondere von lackierten Fahrzeugkarosserien

Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN103398558A (zh) * 2013-07-24 2013-11-20 深圳市信宇人科技有限公司 全自动组合模块新能源材料真空烘烤方法及真空烘烤线
CN103398558B (zh) * 2013-07-24 2016-05-25 深圳市信宇人科技有限公司 全自动组合模块新能源材料真空烘烤方法及真空烘烤线
EP4036506A3 (fr) * 2015-07-31 2022-10-12 Dürr Systems AG Installation de traitement et procédé de traitement de pièces
US11740021B2 (en) 2015-07-31 2023-08-29 Dürr Systems Ag Treatment installation and method for treating workpieces

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EP2083235A1 (fr) 2009-07-29

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