EP0492268A1 - Method for removing paint from products - Google Patents
Method for removing paint from products Download PDFInfo
- Publication number
- EP0492268A1 EP0492268A1 EP91121187A EP91121187A EP0492268A1 EP 0492268 A1 EP0492268 A1 EP 0492268A1 EP 91121187 A EP91121187 A EP 91121187A EP 91121187 A EP91121187 A EP 91121187A EP 0492268 A1 EP0492268 A1 EP 0492268A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paint
- workpieces
- coating agent
- surface coating
- carrier
- 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.)
- Withdrawn
Links
Classifications
-
- 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 for stripping paint from workpieces by embrittling the paint layer using a cryogenic medium.
- Mechanical post-processing is necessary to completely remove the paint from the surface of the carrier. This consists, for example, of removing the paint residues by means of impact with a hammer or a needle gun or by blasting agent.
- blasting medium bombardment the cooled workpieces to be stripped are fed to a blasting chamber in a blasting chamber. There, the surface of the workpieces is bombarded with an abrasive (usually steel grains with diameters between 0.5 and 2 mm), causing the paint to detach from the surface.
- the paint residues are transported out of the blasting chamber together with the blasting media and must then be separated from one another.
- Abrasive media and paint residues are usually initially separated in coarse form through sieve trays, then fine paint particles and paint dust are separated from the blasting media by air separation or magnetic separation.
- the prerequisite for a good separation is the presence of embrittled paint residues. Otherwise the paint particles will stick to the blasting agent. This fact has a disadvantageous effect on the separation process, which is already complex.
- This stripping process also has the disadvantage that the surface of the paint carrier is exposed to large, selective pressure loads due to the bombardment with the blasting agent. This leads to damage, notches and other surface changes, especially in the case of soft carrier material or thin-walled lacquer carriers.
- the abrasive bombardment also involves removal of material from the paint carrier. This wear destroys thin-walled carriers after just a few stripping operations.
- the invention is therefore based on the object of developing an improved environmentally friendly paint stripping method for workpieces by embrittling the paint layer by means of a cryogenic medium, which in particular avoids the disadvantages mentioned above.
- This object is achieved in that the workpieces are treated with high-pressure water jets during or after cooling with the cryogenic medium.
- the method according to the invention ensures rapid removal of the embrittled, burst lacquer layer.
- the high-pressure water jet treatment is carried out with several nozzles that direct the water jets onto the surface of the workpieces.
- the water penetrates into the cracks of the lacquer layer with high pressure and infiltrates the partly detached lacquer surfaces, whereby these are completely removed from their carrier.
- the high water pressure leads to an impact, which further crushes and loosens the embrittled paint surfaces without, however, removing material from the paint carrier itself.
- the detachment of the lacquer layer is further supported by local ice formation in the water between the lacquer and the carrier material, since it is known that the ice formation leads to a sudden increase in volume.
- the paint residues can be separated from the wastewater without great technical effort, for example simply by sedimentation or filtering.
- the stripped workpieces are dried, whereby the water evaporates from the surface without leaving any residue. Any foreign substance residues that remain on the surface of the workpieces in other chemical stripping processes, in particular, and which may impair the subsequent painting process, do not occur in the process according to the invention.
- the invention it is also possible to carry out the cooling of the painted workpiece and the treatment with the boiling water jet at the same time.
- the cryogenic medium is sprayed onto the layers of paint and the high-pressure water jets are simultaneously directed onto the workpieces. If the workpieces are in a rotatable device, it is advantageous to spray the cryogenic medium from one side and the water jets from the opposite side in order to cover the entire surface evenly.
- the workpieces are preferably cooled using cryogenic nitrogen or carbon dioxide as the cryogenic medium.
- cryogenic nitrogen or carbon dioxide as the cryogenic medium.
- the workpieces are placed, for example, in a bath with liquefied nitrogen or a container with dry carbon dioxide snow. The lowest temperatures that can be reached are then around -196 ° C or -78 ° C.
- the liquid nitrogen or the carbon dioxide dry snow can also be sprayed onto the workpieces using nozzles.
- the paint stripping process according to the invention is highly environmentally friendly, since only the cryogenic, non-toxic and chemically inert nitrogen or Carbon dioxide and pure water can be used.
- the water can be reused after separating the paint residues. Evaporated nitrogen or sublimed carbon dioxide can be collected by suction devices and safely removed.
- the process is advantageously carried out in such a way that the water jets are applied to the surface of the workpieces at a pressure between 50 and 2000 bar, depending on the paint carrier and type of paint. Care must be taken to ensure that the carrier material is not damaged by excessively high water pressures, since a cutting effect of the water jet can occur in particular when the water jet diameter is small and the pressures are too high.
- the diameter of the nozzles emitting the high-pressure water jets can be selected between 0.2 and 5 mm.
- the water pressure and nozzle diameter are set in such a way that optimal paint stripping can be carried out without damaging the paint carrier.
- bodyskids large frame frames
- small parts e.g. spacers
- paint are produced, which have to be stripped from time to time.
- workpieces are immersed in correspondingly large vessels filled with liquid nitrogen and cooled for three to five minutes until the paint layers are sufficiently brittle.
- the evaporating nitrogen is collected and removed by suction devices at the edge of the pool. This prevents nitrogen enrichment of the ambient air, which is hazardous to safety.
- the workpieces are hosed down in a high-pressure water jet system.
- a water pressure of approximately 320 bar is sufficient to paint the parts sufficiently.
- the bodyskids mentioned, which contain sensitive thin-walled parts, can be gently stripped by the process according to the invention.
- the nitrogen requirement can be specified in the exemplary embodiment with about 0.5 kg of nitrogen per kg of material to be stripped.
- the waste water is cleaned of the paint residues with filters and then returned to the high-pressure water jet system.
- the exemplary embodiment confirms the environmental friendliness due to the recyclable paint stripping agents used in the method according to the invention and the satisfactory paint stripping without damaging the paint carrier.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Entlacken von Werkstücken durch Verspröden der Lackschicht mittels eines tiefkalten Mediums.The invention relates to a method for stripping paint from workpieces by embrittling the paint layer using a cryogenic medium.
Fördereinrichtungen (z.B. Bodyskids in der Automobilindustrie), Gehänge, Gitterroste und vieles mehr werden meist als Träger der zu lackierenden Werkstücke beim Lackiervorgang unvermeidlich mit Lack verunreinigt. Für derartige Vorrichtungen sowie für fehlerhaft lackierte Werkstücke benötigt man infolgedessen Entlackungsverfahren, die die Lackträger schonend von den Lackschichten befreien und außerdem umweltfreundlich sind.Conveyors (e.g. bodyskids in the automotive industry), hangers, gratings and much more are inevitably contaminated with paint during the painting process as a carrier for the workpieces to be painted. For such devices and for incorrectly painted workpieces, stripping processes are consequently required which gently remove the paint layers from the paint carriers and are also environmentally friendly.
Bei bekannten Verfahren zum Entlacken von Werkstücken durch Verspröden der Lackschicht mittels eines tiefkalten Mediums werden die Werkstücke durch das tiefkalte Medium zunächst stark unter Normaltemperatur abgekühlt und anschließend mechanisch bearbeitet. Beim Abkühlen meist mit Hilfe flüssigen Stickstoffs verliert der Lack seine Zähigkeit und Elastizität und versprödet. Dies gilt für bereits ausgehärtete als auch für gerade aufgebrachte Lackschichten. Mit dem Abkühlen ist zudem eine thermische Kontraktion der Werkstoffe verbunden. In der Regel sind die thermischen Ausdehnungskoeffizienten von Trägerwerkstoff und Lackschicht stark unterschiedlich. Dies führt zu hohen Scherkräften in der Grenzschicht zwischen Lack und Träger, die die maximale Haftfestigkeit der Lackschicht überschreiten können, wodurch sich diese flächenhaft vom Träger ablöst. Da aber der Lack gleichzeitig seine Elastizität verliert, treten in der Lackschicht selbst hohe Zugspannungen auf, die Risse in der Lackschicht verursachen. Beide Effekte führen je nach Art der Lackschicht und des Trägerwerkstoffs zu mehr oder weniger starker Rißbildung und Ablösung der Lackschicht vom Träger.In known methods for stripping paint from workpieces by embrittling the paint layer by means of a cryogenic medium, the workpieces are first cooled down strongly below normal temperature by the cryogenic medium and then machined. When cooling, usually with the help of liquid nitrogen, the paint loses its toughness and elasticity and becomes brittle. This applies to already cured as well as for just applied lacquer layers. Cooling also involves a thermal contraction of the materials. As a rule, the thermal expansion coefficients of the carrier material and the lacquer layer are very different. This leads to high shear forces in the boundary layer between the lacquer and the carrier, which can exceed the maximum adhesive strength of the lacquer layer, as a result of which the surface is detached from the carrier. However, since the paint loses its elasticity at the same time, high tensile stresses occur in the paint layer itself, which cause cracks in the paint layer. Depending on the type of lacquer layer and the carrier material, both effects lead to more or less severe crack formation and detachment of the lacquer layer from the carrier.
Um die Oberfläche des Trägers vollständig vom Lack zu befreien, ist eine mechanische Nachbearbeitung nötig. Diese besteht beispielsweise darin, mit einem Hammer oder einer Nadelpistole oder durch Strahlmittelbeschuß die Lackreste mittels Stoßeinwirkung zu entfernen. Im Fall des Strahlmittelbeschusses werden die zu entlackenden, abgekühlten Werkstücke an einer drehbaren Aufhängung einer Strahlkammer zugeführt. Dort wird die Oberfläche der Werkstücke mit einem Strahlmittel (meist Stahlkörner mit Durchmessern zwischen 0,5 und 2 mm) beschossen, wodurch sich der Lack von der Oberfläche löst. Die Lackreste werden zusammen mit dem Strahlmittel aus der Strahlkammer befördert und müssen anschließend voneinander getrennt werden.Mechanical post-processing is necessary to completely remove the paint from the surface of the carrier. This consists, for example, of removing the paint residues by means of impact with a hammer or a needle gun or by blasting agent. In the case of blasting medium bombardment, the cooled workpieces to be stripped are fed to a blasting chamber in a blasting chamber. There, the surface of the workpieces is bombarded with an abrasive (usually steel grains with diameters between 0.5 and 2 mm), causing the paint to detach from the surface. The paint residues are transported out of the blasting chamber together with the blasting media and must then be separated from one another.
Die Trennung von Strahlmittel und Lackresten erfolgt meist zunächst in grober Form durch Siebböden, anschließend werden durch Windsichtung oder Magnetabscheidung feine Lackpartikel und Lackstaub vom Strahlmittel getrennt. Voraussetzung für eine gute Trennung ist das Vorliegen von noch versprödeten Lackresten. Andernfalls verkleben die Lackpartikel mit dem Strahlmittel. Diese Tatsache wirkt sich nachteilig auf den ohnehin aufwendigen Separationsvorgang aus.Abrasive media and paint residues are usually initially separated in coarse form through sieve trays, then fine paint particles and paint dust are separated from the blasting media by air separation or magnetic separation. The prerequisite for a good separation is the presence of embrittled paint residues. Otherwise the paint particles will stick to the blasting agent. This fact has a disadvantageous effect on the separation process, which is already complex.
Dieses Entlackungsverfahren hat außerdem den Nachteil, daß durch den Beschuß mit dem Strahlmittel die Oberfläche des Lackträgers großen punktuellen Druckbelastungen ausgesetzt ist. Dies führt zu Beschädigungen, Einkerbungen und anderen Oberflächenveränderungen, insbesondere bei weichem Trägermaterial oder dünnwandigen Lackträgern. Außerdem ist mit dem Strahlmittelbeschuß auch ein Materialabtrag vom Lackträger verbunden. Dieser Verschleiß zerstört dünnwandige Träger bereits nach einigen Entlackungsvorgängen.This stripping process also has the disadvantage that the surface of the paint carrier is exposed to large, selective pressure loads due to the bombardment with the blasting agent. This leads to damage, notches and other surface changes, especially in the case of soft carrier material or thin-walled lacquer carriers. In addition, the abrasive bombardment also involves removal of material from the paint carrier. This wear destroys thin-walled carriers after just a few stripping operations.
Der Erfindung liegt daher die Aufgabe zugrunde, ein verbessertes umweltfreundliches Entlackungsverfahren für Werkstücke durch Verspröden der Lackschicht mittels eines tiefkalten Mediums zu entwickeln, das insbesondere die obengenannten Nachteile vermeidet.The invention is therefore based on the object of developing an improved environmentally friendly paint stripping method for workpieces by embrittling the paint layer by means of a cryogenic medium, which in particular avoids the disadvantages mentioned above.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Werkstücke während oder nach der Abkühlung mit dem tiefkalten Medium mit Hochdruck-Wasserstrahlen behandelt werden.This object is achieved in that the workpieces are treated with high-pressure water jets during or after cooling with the cryogenic medium.
Das erfindungsgemäße Verfahren sorgt für eine rasche Entfernung der versprödeten, aufgeplatzten Lackschicht. Die Hochdruck-Wasserstrahlbehandlung erfolgt mit mehreren Düsen, die die Wasserstrahlen auf die Oberfläche der Werkstücke richten. Das Wasser dringt mit hohem Druck in die Risse der Lackschicht ein und unterwandert die zum Teil abgelösten Lackflächen, wobei diese ganz von ihrem Träger entfernt werden. Außerdem führt der hohe Wasserdruck zu einer Stoßwirkung, die die versprödeten Lackflächen weiter zerkleinert und ablöst, ohne jedoch vom Lackträger selbst Material abzutragen. Das Ablösen der Lackschicht wird durch lokale Eisbildung des Wassers zwischen Lack und Trägermaterial noch unterstützt, da die Eisbildung bekanntlich zu einer sprunghaften Volumenvergrößerung führt.The method according to the invention ensures rapid removal of the embrittled, burst lacquer layer. The high-pressure water jet treatment is carried out with several nozzles that direct the water jets onto the surface of the workpieces. The water penetrates into the cracks of the lacquer layer with high pressure and infiltrates the partly detached lacquer surfaces, whereby these are completely removed from their carrier. In addition, the high water pressure leads to an impact, which further crushes and loosens the embrittled paint surfaces without, however, removing material from the paint carrier itself. The detachment of the lacquer layer is further supported by local ice formation in the water between the lacquer and the carrier material, since it is known that the ice formation leads to a sudden increase in volume.
Die Trennung der Lackreste vom Abwasser kann ohne großen technischen Aufwand beispielsweise einfach durch Sedimentation oder Filterung erfolgen.The paint residues can be separated from the wastewater without great technical effort, for example simply by sedimentation or filtering.
Die entlackten Werkstücke werden getrocknet, wobei das Wasser rückstandsfrei von der Oberfläche verdunstet. Etwaige Fremdstoffreste, die bei anderen insbesondere chemischen Entlackungsverfahren auf der Oberfläche der Werkstücke verbleiben und den möglicherweise nachfolgenden Lackierprozeß beeinträchtigen, treten beim erfindungsgemäßen Verfahren nicht auf.The stripped workpieces are dried, whereby the water evaporates from the surface without leaving any residue. Any foreign substance residues that remain on the surface of the workpieces in other chemical stripping processes, in particular, and which may impair the subsequent painting process, do not occur in the process according to the invention.
Erfindungsgemäß ist es auch möglich, die Abkühlung des lackierten Werkstücks und die Behandlung mit dem Kochdruckwasserstrahl gleichzeitig auszuführen. Das tiefkalte Medium wird dabei auf die Lackschichten gespritzt und die Hochdruckwasserstrahlen gleichzeitig auf die Werkstücke gerichtet. Befinden sich die Werkstücke in einer drehbaren Vorrichtung, so ist es vorteilhaft, von einer Seite das tiefkalte Medium und von der gegenüberliegenden Seite die Wasserstrahlen aufzuspritzen, um die gesamte Oberfläche gleichmäßig zu erfassen.According to the invention, it is also possible to carry out the cooling of the painted workpiece and the treatment with the boiling water jet at the same time. The cryogenic medium is sprayed onto the layers of paint and the high-pressure water jets are simultaneously directed onto the workpieces. If the workpieces are in a rotatable device, it is advantageous to spray the cryogenic medium from one side and the water jets from the opposite side in order to cover the entire surface evenly.
Vorzugsweise werden die Werkstücke mit tiefkaltem Stickstoff oder Kohlendioxid als tiefkaltes Medium abgekühlt. Die Werkstücke werden dazu beispielsweise in ein Bad mit verflüssigtem Stickstoff oder einen Behälter mit Kohlendioxid-Trockenschnee eingebracht. Die tiefsten erreichbaren Temperaturen betragen dann etwa -196°C bzw. -78°C. Der flüssige Stickstoff oder der Kohlendioxid-Trockenschnee können auch mittels Düsen auf die Werkstücke aufgespritzt werden.The workpieces are preferably cooled using cryogenic nitrogen or carbon dioxide as the cryogenic medium. For this purpose, the workpieces are placed, for example, in a bath with liquefied nitrogen or a container with dry carbon dioxide snow. The lowest temperatures that can be reached are then around -196 ° C or -78 ° C. The liquid nitrogen or the carbon dioxide dry snow can also be sprayed onto the workpieces using nozzles.
Das erfindungsgemäße Entlackungsverfahren ist in hohem Maße umweltfreundlich, da als Entlackungsmittel nur der tiefkalte, ungiftige und chemisch inerte Stickstoff oder Kohlendioxid und reines Wasser eingesetzt werden. Das Wasser kann nach Separation der Lackreste wieder verwendet werden. Verdunsteter Stickstoff oder sublimiertes Kohlendioxid können durch Absaugvorrichtungen gesammelt und sicher abgeleitet werden.The paint stripping process according to the invention is highly environmentally friendly, since only the cryogenic, non-toxic and chemically inert nitrogen or Carbon dioxide and pure water can be used. The water can be reused after separating the paint residues. Evaporated nitrogen or sublimed carbon dioxide can be collected by suction devices and safely removed.
Das Verfahren wird vorteilhaft derart ausgeführt, daß die Wasserstrahlen je nach Lackträger und Lackart mit einem Druck zwischen 50 und 2000 bar auf die Oberfläche der Werkstücke aufgebracht werden. Dabei ist darauf zu achten, daß das Trägermaterial nicht durch zu hohe Wasserdrücke beschädigt wird, da insbesondere bei kleinem Wasserstrahldurchmesser und zu hohen Drücken eine Schneidwirkung des Wasserstrahls auftreten kann.The process is advantageously carried out in such a way that the water jets are applied to the surface of the workpieces at a pressure between 50 and 2000 bar, depending on the paint carrier and type of paint. Care must be taken to ensure that the carrier material is not damaged by excessively high water pressures, since a cutting effect of the water jet can occur in particular when the water jet diameter is small and the pressures are too high.
In diesem Zusammenhang ist es vorteilhaft, wenn der Durchmesser der die Hochdruck-Wasserstrahlen abgebenden Düsen zwischen 0,2 und 5 mm gewählt werden kann. Wasserdruck und Düsendurchmesser werden je nach Anwendungsfall derart eingestellt, daß eine optimale Entlackung ohne Beschädigung des Lackträgers vorgenommen werden kann.In this context, it is advantageous if the diameter of the nozzles emitting the high-pressure water jets can be selected between 0.2 and 5 mm. Depending on the application, the water pressure and nozzle diameter are set in such a way that optimal paint stripping can be carried out without damaging the paint carrier.
Im folgenden soll ein Ausführungsbeispiel das erfindungsgemäße Verfahren näher erläutern.An exemplary embodiment is intended to explain the method according to the invention in more detail below.
In der Automobilindustrie fallen mit Lack verschmutzte Bodyskids (große Rahmengestelle) und Kleinteile (z.B. Abstandshalter) an, die von Zeit zu Zeit entlackt werden müssen. Diese Werkstücke werden in entsprechend große Gefäße, die mit flüssigem Stickstoff gefüllt sind, eingetaucht und drei bis fünf Minuten abgekühlt, bis die Lackschichten genügend stark versprödet sind. Der verdampfende Stickstoff wird durch Absaugvorrichtungen am Beckenrand gesammelt und abgeführt. Damit wird eine sicherheitsgefährdende Stickstoff-Anreicherung der Umgebungsluft vermieden.In the automotive industry, bodyskids (large frame frames) and small parts (e.g. spacers) soiled with paint are produced, which have to be stripped from time to time. These workpieces are immersed in correspondingly large vessels filled with liquid nitrogen and cooled for three to five minutes until the paint layers are sufficiently brittle. The evaporating nitrogen is collected and removed by suction devices at the edge of the pool. This prevents nitrogen enrichment of the ambient air, which is hazardous to safety.
Nach dem Abkühlen werden die Werkstücke in einer Hochdruck-Wasserstrahlanlage abgespritzt. In dem ausgeführten Beispiel genügt ein Wasserdruck von etwa 320 bar, um die Teile ausreichend zu entlacken. Insbesondere die erwähnten Bodyskids, die empfindliche dünnwandige Teile enthalten, können durch das erfindungsgemäße Verfahren schonend entlackt werden.After cooling, the workpieces are hosed down in a high-pressure water jet system. In the example shown, a water pressure of approximately 320 bar is sufficient to paint the parts sufficiently. In particular, the bodyskids mentioned, which contain sensitive thin-walled parts, can be gently stripped by the process according to the invention.
Der Stickstoffbedarf läßt sich beim Ausführungsbeispiel mit etwa 0,5 kg Stickstoff pro kg zu entlackendem Material angeben. Das Abwasser wird mit Filtern von den Lackresten gereinigt und anschließend der Hochdruck-Wasserstrahlanlage wieder zugeführt.The nitrogen requirement can be specified in the exemplary embodiment with about 0.5 kg of nitrogen per kg of material to be stripped. The waste water is cleaned of the paint residues with filters and then returned to the high-pressure water jet system.
Die Umweltfreundlichkeit durch die beim erfindungsgemäßen Verfahren verwendeten recyclefähigen Entlackungsmittel sowie die zufriedenstellende Entlackung ohne Beschädigung des Lackträgers, werden durch das Ausführungsbeispiel bestätigt.The exemplary embodiment confirms the environmental friendliness due to the recyclable paint stripping agents used in the method according to the invention and the satisfactory paint stripping without damaging the paint carrier.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19904041307 DE4041307A1 (en) | 1990-12-21 | 1990-12-21 | METHOD FOR DE-PAINTING WORKPIECES |
| DE4041307 | 1990-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0492268A1 true EP0492268A1 (en) | 1992-07-01 |
Family
ID=6421110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91121187A Withdrawn EP0492268A1 (en) | 1990-12-21 | 1991-12-10 | Method for removing paint from products |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0492268A1 (en) |
| DE (1) | DE4041307A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994005517A1 (en) * | 1992-09-10 | 1994-03-17 | Otmar Fahrion | Paint stripper |
| WO1999032237A1 (en) * | 1997-12-19 | 1999-07-01 | Manfred Douven | Method and device for regenerating painted and/or primered panels |
| DE19807635A1 (en) * | 1998-02-23 | 1999-08-26 | Air Liquide Gmbh | Procedure for removing bituminous and other adhering layers of impurities from wall surfaces |
| EP1576689A2 (en) * | 2002-11-19 | 2005-09-21 | Ultrastrip Systems, Inc. | Robotic paint/surface coating removal apparatus |
| CN108097642A (en) * | 2017-12-26 | 2018-06-01 | 苏州贝尔纳德铁路设备有限公司 | A kind of Paint removing process of high-speed EMU wheel pair |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006000658A1 (en) * | 2006-01-03 | 2007-07-05 | Volkswagen Ag | Vehicle body surface treatment method, involves cleaning contact surface of receiver of locking mechanism of chassis body locking mechanism by removal of coating material using mechanical medium e.g. brush or ultrasonic |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2045888A (en) * | 1979-03-12 | 1980-11-05 | Elan Pressure Clean Ltd | Washing components |
| DE2952391A1 (en) * | 1979-12-24 | 1981-09-24 | Grensing GmbH, 4000 Düsseldorf | Paint residue removal for automobile industry - uses pressurised water spray after body spraying |
| EP0148427A2 (en) * | 1983-12-24 | 1985-07-17 | Kernforschungszentrum Karlsruhe Gmbh | Process for dissolving or removing protective layers or coverings applied to surfaces |
| EP0250915A1 (en) * | 1986-07-03 | 1988-01-07 | Messer Griesheim Gmbh | Process for removing colour coats from work pieces |
-
1990
- 1990-12-21 DE DE19904041307 patent/DE4041307A1/en not_active Withdrawn
-
1991
- 1991-12-10 EP EP91121187A patent/EP0492268A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2045888A (en) * | 1979-03-12 | 1980-11-05 | Elan Pressure Clean Ltd | Washing components |
| DE2952391A1 (en) * | 1979-12-24 | 1981-09-24 | Grensing GmbH, 4000 Düsseldorf | Paint residue removal for automobile industry - uses pressurised water spray after body spraying |
| EP0148427A2 (en) * | 1983-12-24 | 1985-07-17 | Kernforschungszentrum Karlsruhe Gmbh | Process for dissolving or removing protective layers or coverings applied to surfaces |
| EP0250915A1 (en) * | 1986-07-03 | 1988-01-07 | Messer Griesheim Gmbh | Process for removing colour coats from work pieces |
Non-Patent Citations (1)
| Title |
|---|
| NEW SCIENTIST 4. August 1990, LONDON GB Seite 35; ANON: 'COLD WATER TREATMENT FOR PAINTED PLANES' * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994005517A1 (en) * | 1992-09-10 | 1994-03-17 | Otmar Fahrion | Paint stripper |
| WO1999032237A1 (en) * | 1997-12-19 | 1999-07-01 | Manfred Douven | Method and device for regenerating painted and/or primered panels |
| DE19807635A1 (en) * | 1998-02-23 | 1999-08-26 | Air Liquide Gmbh | Procedure for removing bituminous and other adhering layers of impurities from wall surfaces |
| DE19807635B4 (en) * | 1998-02-23 | 2015-12-17 | Air Liquide Gmbh | Dosing weigher with means for removing bituminous and similar contaminant layers from the surface of a wall |
| EP1576689A2 (en) * | 2002-11-19 | 2005-09-21 | Ultrastrip Systems, Inc. | Robotic paint/surface coating removal apparatus |
| EP1576689A4 (en) * | 2002-11-19 | 2009-12-09 | Ultrastrip Systems Inc | Robotic paint/surface coating removal apparatus |
| CN108097642A (en) * | 2017-12-26 | 2018-06-01 | 苏州贝尔纳德铁路设备有限公司 | A kind of Paint removing process of high-speed EMU wheel pair |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4041307A1 (en) | 1992-06-25 |
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