EP0080407A2 - Verfahren und Vorrichtung zum Entfernen von Schichten von Gegenständen - Google Patents

Verfahren und Vorrichtung zum Entfernen von Schichten von Gegenständen Download PDF

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Publication number
EP0080407A2
EP0080407A2 EP82402096A EP82402096A EP0080407A2 EP 0080407 A2 EP0080407 A2 EP 0080407A2 EP 82402096 A EP82402096 A EP 82402096A EP 82402096 A EP82402096 A EP 82402096A EP 0080407 A2 EP0080407 A2 EP 0080407A2
Authority
EP
European Patent Office
Prior art keywords
tank
inert gas
pickling
product
objects
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
EP82402096A
Other languages
English (en)
French (fr)
Other versions
EP0080407A3 (en
EP0080407B1 (de
Inventor
Bernd Blaudszun
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6146705&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0080407(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to AT82402096T priority Critical patent/ATE18741T1/de
Publication of EP0080407A2 publication Critical patent/EP0080407A2/de
Publication of EP0080407A3 publication Critical patent/EP0080407A3/fr
Application granted granted Critical
Publication of EP0080407B1 publication Critical patent/EP0080407B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
    • C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
    • C23G5/04—Apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
    • B08B7/0092—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning

Definitions

  • the invention relates to a method of pickling objects provided with a coating, in particular painted or varnished objects, by soaking in a solvent bath.
  • the object of the invention is a method for removing the separable layers from the objects covered therewith, in particular for stripping varnished objects which, despite the low operating costs, produces no waste, only requires 'a low consumption of raw material and produces only a small and negligible emission into the atmosphere.
  • this task is solved, in a process according to which the objects are introduced into a closed tank and treated with a liquid fluid, the mixture of treatment fluid and pickled material being then collected, the treatment fluid being separated from the pickled material, inert gas being introduced into the tank after the removal of the layers has been completed and the gas leaving the tank being condensed to separate the released treatment fluid, in that coated articles are introduced into the hermetically sealed tank, that inert gas is introduced into said tank until a residual oxygen content of 3% by volume is obtained, which the gas leaving the inerting tank heats up by heat exchange.
  • inert gas introduced into the tank only after inerting a pickling product is introduced into the tank, in which the objects to be pickled are soaked, only after the pickling operation and before t the drying of the pickled objects the mixture of coating and pickling product is pumped out of the tank, that the gas mixture leaving the tank during drying is cooled by the inert gas introduced into the tank by heat exchange before the condensation of the pickling product and the inert gas is discharged into the atmosphere after the pickling product has condensed.
  • the removal of the layers takes place with a solvent which is known per se but, according to the invention, the process has therefore takes place under an inert atmosphere.
  • the inert gas can be evacuated into the atmosphere, possibly passing through an appropriate separation device, without harmful substances being entrained.
  • the inert gas used in the layer removal process is also used for the separation of the solvent and the material forming the protective coating.
  • the inert gas evacuates the vaporized solvent and brings it to condensation in a suitable device.
  • the separated solvent can then be reused in the operating process, the use of polluting and expensive chemicals being therefore kept within very low limits during the implementation of the process.
  • the solvent When the solvent is separated from the solvent-coating material mixture, an appropriate concentration of this mixture can be obtained in order to make it reusable. This is for example the case of removing the varnish.
  • the varnish mixed in the solvent can be reused with the desired concentration for a new varnishing process, for obtaining pigments, etc. In this way, it is avoided to direct it on a particular discharge and the disadvantage which results for the environment is removed.
  • nitrogen is used as inert gas.
  • nitrogen can be used particularly favorably in the process which is the subject of the invention.
  • the gas escaping from the bath is cooled by heat exchange with the inert gas which is introduced. If, for example, nitrogen gas is removed from a pressure tank containing liquid nitrogen, the temperature of the nitrogen gas drops, because the heat of evaporation is removed. If the nitrogen which is introduced by heat exchange is now heated, this leads to cooling of the nitrogen-vapor mixture of the solvent. Thereby the solvent vapor can condense and the liquid condensate can be collected while pure nitrogen escapes into the atmosphere.
  • the pickled objects are still impregnated with solvent.
  • inert gas is used to separate the solvent from the coating material.
  • the tank into which the solvent-coating material mixture is pumped can be reheated. If nitrogen is used as the inert gas and the usual solvent, reheating involves a temperature of around 60 ° C.
  • the inert gas used for the evaporation and condensation of the solvent is preferably kept in a closed circuit, the quantity of inert gas required being thereby reduced to a minimum.
  • the product circulating in the circuit will preferably be made inert by means of an inert gas.
  • the process which is the subject of the invention is characterized by optimal reuse of the raw materials used. With very low operating costs, there is no production of waste. The quantities of products emitted with the process which is the subject of the invention are clearly below the authorities' recommendations. The amounts of energy necessary for implementing the process which is the subject of the invention are very low. Due to the handling of the solvent, which takes place only in an inert atmosphere, work safety is clearly better than average, the danger of fire and explosion being greatly reduced. The influences exerted on workstations with regard to noise and other nuisances are minimal. Finally, the process which is the subject of the invention can be largely automated.
  • An installation according to the invention with a tank receiving the objects and which can be connected to an inert gas tank via a supply line and a shut-off valve, a tank of pickling product connected to the tank is characterized in that the tank can be hermetically sealed and can be connected to the atmosphere via a second shut-off valve, an exchanger and a condenser, as the inert gas tank is connected to the tank via the exchanger, that the pickling product tank is connected to the tank via a pump and that another pump for pumping the pickling product-varnish mixture out of the tank is planned.
  • the installation which is the subject of the invention makes it possible to render the pickling tank inert before it is filled with solvent and drying of the pickled objects when the solvent-coating material mixture is removed. Between these phases of the process, the shut-off valves are closed, which makes it possible to maintain at a relatively small value the quantity of inert gas necessary for such a process. Leakage of inert gas to the atmosphere, in particular during the drying phase, does not represent any disorder for the environment, since appropriate precautions make it possible to separate the solvent which is contained therein in the form of vapor.
  • the heat exchanger of the installation which is the subject of the invention is preferably an evaporator of a refrigeration unit.
  • This evaporator ensures sufficient cooling of the gaseous mixture constituted by the solvent vapor and by the inert gas, so that the solvent vapor can be condensed and separated, the cooled inert gas being able, according to one embodiment of the invention, to be brought by via a pipe in the thickening tank and which, according to another embodiment of the invention, can be used for cooling in a recuperator brought to the evaporator.
  • the separated solvent can be returned to the solvent tank via suitable pumps and can be reused.
  • the solvent mixture and the coating materials concentrated in the thickening tank can also be reused.
  • Two tanks, 10 and 11, hermetically closed by a cover 12 or 13, are provided.
  • the tanks 10 and 11 can be connected to a nitrogen tank 16, via the supply lines 14 and 15, and stop valves V3 or V4.
  • the outlet of the nitrogen tank 16 can be closed directly using a shut-off valve V1.
  • the tanks 10 and 11 can be connected to the atmosphere by means of the valves V6 or V5, a pipe 17, an exchanger 18, a separator 19 and a pipe 20.
  • In the exchanger 18 is a coil 21, which constitutes a part of the supply line 14.
  • the tanks 10 and 11 are pickling tanks which are further equipped with ultrasonic generators, as indicated in 22 or 23.
  • the tanks 10 and 11 can be connected to a solvent tank 27 by means of a pump 24, pipes 25 or 26 and valves V9 and V10.
  • the tanks 10 and 11 can be connected to a thickening tank 31 by means of the shut-off valves V8 and V7, the pipes 28 or 29 and a pump 30.
  • the supply pipe 32 to the tank d thickening 31 is provided with a heating device 33.
  • a fan 35 is arranged on an evacuation pipe 34, coming from the thickening tank 31. From the blowing side of the fan 35, the pipe 34 is directed towards the input of a recuperator 36, one of the outputs of which is connected to the evaporator 38 of a refrigeration unit designated, in general, by 39, by means of a pipe 37.
  • An outlet pipe 40 of the evaporator 38 is connected to a separator 41.
  • a pipe 42 leaving the separator 41 passes through the recuperator 36 and is connected to line 32, upstream of the heating device 33.
  • Line 14 is connected to line 37 or 32, via a line 43.
  • the separators 19 and 41 are provided with outlet pipes 44 or 45 which lead to a collecting pipe 46 which comprises a pump 47 and which is connected to the solvent tank 27.
  • a pipe 48 comprising a valve V11 is connected to a thickening tank 31.
  • the stripping procedure then begins with the help of ultrasound.
  • valve V2 is open, which makes it possible to render the condensation circuit consisting of the heating device 33, the thickening tank 31, the recuperator 36, the evaporator 38, the inert separator 41 as well as corresponding pipes.
  • valve V2 When a predetermined oxygen concentration is reached the valve V2 is closed again. The heater 33 is turned on until a predetermined temperature is reached.
  • valve V8 opens and the pump transports the mixture consisting of dissolved varnish and solvent into the thickening tank 31.
  • the mixture is designated by 46.
  • valves V3 and V6 open.
  • the stream of nitrogen passing through the tank 10 dries the pickled parts.
  • the solvent-nitrogen vapor mixture passes through the exchanger 18.
  • the purified nitrogen escapes into the atmosphere through line 20.
  • the solvent coming from the separator 19 enters the solvent tank 27 via line 44 and using the pump 47.
  • the reservoir 10 is filled with air.
  • the cover 12 opens automatically and the pickled and cleaned parts can be extracted.
  • the pickling phase can then be repeated as described above.
  • the thickening phase takes place as follows in the tank 31.
  • the tempered nitrogen evaporates at a temperature of for example 60 ° C. part of the solvent in the thickening tank 31.
  • the gaseous mixture of solvent and d nitrogen undergoes preliminary cooling in the recuperator 36 via the fan 35 and is sent to the evaporator 38 where the solvent vapor condenses.
  • the separator 41 the solvent and the nitrogen are separated.
  • the nitrogen is again reheated in the recuperator 36 and is brought into the heating device 33 to the desirable temperature for its introduction into the thickening tank 31.
  • the thickening phase lasts until the desirable viscosity of the varnish is reached.
  • the valve V11 opens so that the varnish can be transferred to suitable containers via the line 48.
  • the temperatures used in the thickening circuit are shown in the figure. However, they should not be considered as limiting.
  • a pickling phase can also be carried out in parallel, or with offset, in the tank 11.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Removal Of Floating Material (AREA)
  • Processing Of Solid Wastes (AREA)
  • Coating Apparatus (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP82402096A 1981-11-19 1982-11-17 Verfahren und Vorrichtung zum Entfernen von Schichten von Gegenständen Expired EP0080407B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82402096T ATE18741T1 (de) 1981-11-19 1982-11-17 Verfahren und vorrichtung zum entfernen von schichten von gegenstaenden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3145815A DE3145815C2 (de) 1981-11-19 1981-11-19 Verfahren zum Entfernen von ablösungsfähigen Materialschichten von beschichteten Gegenständen,
DE3145815 1981-11-19

Publications (3)

Publication Number Publication Date
EP0080407A2 true EP0080407A2 (de) 1983-06-01
EP0080407A3 EP0080407A3 (en) 1983-11-23
EP0080407B1 EP0080407B1 (de) 1986-03-26

Family

ID=6146705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82402096A Expired EP0080407B1 (de) 1981-11-19 1982-11-17 Verfahren und Vorrichtung zum Entfernen von Schichten von Gegenständen

Country Status (9)

Country Link
US (1) US4474199A (de)
EP (1) EP0080407B1 (de)
JP (1) JPS58117883A (de)
AT (1) ATE18741T1 (de)
AU (1) AU559944B2 (de)
CA (1) CA1195594A (de)
DE (1) DE3145815C2 (de)
ES (1) ES517399A0 (de)
ZA (1) ZA827979B (de)

Cited By (7)

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EP0302313A1 (de) * 1987-08-01 1989-02-08 Peter Weil Verfahren und Vorrichtung zum Behandeln von Gegenständen in einem geschlossenen Behälter mit Lösungsmittel
EP0381887A1 (de) * 1989-01-30 1990-08-16 Kabushiki Kaisha Tiyoda Seisakusho Verfahren und System zur Reinigung mit Lösungsmitteln
WO1991008812A1 (de) * 1989-12-15 1991-06-27 Flühs Drehtechnik GmbH Verfahren und vorrichtung zum trennen von lösemitteln und ölen
AU635540B2 (en) * 1989-06-26 1993-03-25 Kabushiki Kaisha Tiyoda Seisakusho Cleaning method and system using a solvent
WO1993017149A1 (en) * 1992-02-25 1993-09-02 Baxter International Inc. Method and apparatus for cleaning with a volatile solvent
EP0627500A1 (de) * 1993-06-01 1994-12-07 Fujitsu Limited Mittel zum Entfernen von Flussmittel, Reinigungsverfahren und Einrichtung
CN109013567A (zh) * 2018-07-18 2018-12-18 中车兰州机车有限公司 清理绝缘漆试样的方法

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DE3644807A1 (de) * 1986-12-31 1988-07-14 Meyer Rud Otto Verfahren zur behandlung der abluft einer durchlaufreinigungsanlage und anlage zur durchfuehrung des verfahrens
DE8816444U1 (de) * 1988-05-27 1989-08-24 C. Christ Abgasfreie Werkzeugreinigungsapparate für die Kunststoffindustrie, 8000 München Vorrichtung zum Reinigen solcher Teile von Kunststoffverarbeitungsmaschinen, an denen Kunststoffreste anhaften
DE3823322A1 (de) * 1988-07-09 1990-01-11 Carl Dittmann Gmbh & Co Kg Verfahren zum reinigen und entfetten von behandlungsgut mit loesungsmitteln
CA2003859A1 (en) * 1989-02-01 1990-08-01 David Alan Dickinson Technique for cleaning an object with a combustible cleaning solvent
CA2011397C (en) * 1989-03-06 1994-07-12 Michael T. Mittag Method and apparatus for cleaning electronic and other devices
DE4119303A1 (de) * 1991-06-12 1991-12-12 Rolf Prof Dr Ing Germerdonk Verfahren zum zerlegen von stueckigen abfallgemischen, die metallteile, loesliche polymere, insbes. aus (chlor-)kohlenwasserstoffen, weichmachern sowie farb- und zuschlagstoffe enthalten, in zwei bzw. drei recyclingfaehige komponenten und in einen chlorkohlenwasserstoff-freien, problemloser zu entsorgenden restabfall
GB2264045B (en) * 1992-02-12 1995-10-11 Kwik Strip Stripping paint and varnish
US5261965A (en) * 1992-08-28 1993-11-16 Texas Instruments Incorporated Semiconductor wafer cleaning using condensed-phase processing
DE4324432C2 (de) * 1993-07-21 1996-04-25 Multimatic Oberflaechentechnik Verfahren zur Reinigung verschmutzter Teile
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US7021635B2 (en) * 2003-02-06 2006-04-04 Tokyo Electron Limited Vacuum chuck utilizing sintered material and method of providing thereof
US7077917B2 (en) 2003-02-10 2006-07-18 Tokyo Electric Limited High-pressure processing chamber for a semiconductor wafer
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US7270137B2 (en) * 2003-04-28 2007-09-18 Tokyo Electron Limited Apparatus and method of securing a workpiece during high-pressure processing
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US7789971B2 (en) 2005-05-13 2010-09-07 Tokyo Electron Limited Treatment of substrate using functionalizing agent in supercritical carbon dioxide
US7524383B2 (en) 2005-05-25 2009-04-28 Tokyo Electron Limited Method and system for passivating a processing chamber
US9327243B2 (en) * 2012-08-24 2016-05-03 The Boeing Company Aircraft fuel tank flammability reduction methods and systems
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US10933594B2 (en) * 2014-10-14 2021-03-02 Technical Tooling LLC Method for forming a part using a layup tool
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CN113857279B (zh) * 2021-08-23 2023-01-24 四川纳涂科技有限公司 一种金刚石涂层的褪除方法

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302313A1 (de) * 1987-08-01 1989-02-08 Peter Weil Verfahren und Vorrichtung zum Behandeln von Gegenständen in einem geschlossenen Behälter mit Lösungsmittel
WO1989001057A1 (fr) * 1987-08-01 1989-02-09 Peter Weil Procede et dispositif de traitement d'objets avec un solvant dans un recipient ferme
EP0381887A1 (de) * 1989-01-30 1990-08-16 Kabushiki Kaisha Tiyoda Seisakusho Verfahren und System zur Reinigung mit Lösungsmitteln
AU635540B2 (en) * 1989-06-26 1993-03-25 Kabushiki Kaisha Tiyoda Seisakusho Cleaning method and system using a solvent
WO1991008812A1 (de) * 1989-12-15 1991-06-27 Flühs Drehtechnik GmbH Verfahren und vorrichtung zum trennen von lösemitteln und ölen
US5304253A (en) * 1990-09-12 1994-04-19 Baxter International Inc. Method for cleaning with a volatile solvent
WO1993017149A1 (en) * 1992-02-25 1993-09-02 Baxter International Inc. Method and apparatus for cleaning with a volatile solvent
EP0627500A1 (de) * 1993-06-01 1994-12-07 Fujitsu Limited Mittel zum Entfernen von Flussmittel, Reinigungsverfahren und Einrichtung
US5695571A (en) * 1993-06-01 1997-12-09 Fujitsu Limited Cleaning method using a defluxing agent
EP0811705A1 (de) * 1993-06-01 1997-12-10 Fujitsu Limited Mittel zum Entfernen von Flussmittel und Einrichtung zum Reinigen
US6050479A (en) * 1993-06-01 2000-04-18 Fujitsu, Ltd. Defluxing agent cleaning method and cleaning apparatus
US6140286A (en) * 1993-06-01 2000-10-31 Fujitsu Limited Defluxing agent cleaning method and cleaning apparatus
CN109013567A (zh) * 2018-07-18 2018-12-18 中车兰州机车有限公司 清理绝缘漆试样的方法

Also Published As

Publication number Publication date
ES8401532A1 (es) 1983-12-01
EP0080407A3 (en) 1983-11-23
DE3145815C2 (de) 1984-08-09
US4474199A (en) 1984-10-02
EP0080407B1 (de) 1986-03-26
ATE18741T1 (de) 1986-04-15
AU559944B2 (en) 1987-03-26
CA1195594A (fr) 1985-10-22
AU9043482A (en) 1983-05-26
DE3145815A1 (de) 1983-06-09
ES517399A0 (es) 1983-12-01
JPS58117883A (ja) 1983-07-13
ZA827979B (en) 1983-09-28

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