DE3927432A1 - Removing paint coatings from metal surfaces - by heating with electromagnetic alternating field and scraping off paint - Google Patents

Removing paint coatings from metal surfaces - by heating with electromagnetic alternating field and scraping off paint

Info

Publication number
DE3927432A1
DE3927432A1 DE19893927432 DE3927432A DE3927432A1 DE 3927432 A1 DE3927432 A1 DE 3927432A1 DE 19893927432 DE19893927432 DE 19893927432 DE 3927432 A DE3927432 A DE 3927432A DE 3927432 A1 DE3927432 A1 DE 3927432A1
Authority
DE
Germany
Prior art keywords
metal
paint
heating
alternating field
coating
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Withdrawn
Application number
DE19893927432
Other languages
German (de)
Inventor
Hans-Fried Prof Dipl I Schierk
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.)
SCHIERK HANS FRIED PROF DIPL I
Original Assignee
SCHIERK HANS FRIED PROF DIPL I
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 SCHIERK HANS FRIED PROF DIPL I filed Critical SCHIERK HANS FRIED PROF DIPL I
Priority to DE19893927432 priority Critical patent/DE3927432A1/en
Publication of DE3927432A1 publication Critical patent/DE3927432A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B44D3/166—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning by heating, e.g. by burning
    • B44D3/168—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning by heating, e.g. by burning by electrically heating
    • 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
    • B08B7/0071—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Organic paint coatings are removed from metal surfaces by heating with an electromagnetic alternating field and scraping away. Pref. the electromagnetic field is a high frequency alternating field produced by moving an induction coil over the metal surface. ADVANTAGE - Avoids overheating the top surface thereby avoiding the emission of vapour gas. Does not require the successive removal of one layer after another as the eddy currents heat up the metal surface sufficiently to break up the bond between metal and coating.

Description

Die Erfindung betrifft ein Verfahren, mittels Wärme orga­ nische Anstrichbeschichtungen auf Metalloberfläche zu entfernen.The invention relates to a method by means of heat orga African paint coatings on the metal surface remove.

Um z. B. Stahlkonstruktionen unterschiedlicher Verwen­ dung gegen Korrosion zu schützen werden diese mit Schutz­ anstrichen versehen, die ein System aus organischen Beschichtungen darstellen. Die Beschichtungssysteme haften dabei durch Vernetzung bzw. Polimerisation an der rauhen Metalloberfläche. Aus Gründen mangelnder Bestän­ digkeit müssen die Beschichtungssysteme von Zeit zu Zeit erneuert werden. Dazu werden die alten Beschichtungen unter Einsatz bisher üblichen mechanischen, chemischen oder thermischen Verfahren abgelöst und entfernt.To z. B. Steel structures of different uses They are protected against corrosion with protection paint, which is a system of organic Represent coatings. The coating systems adhere to it through crosslinking or polymerisation rough metal surface. Due to lack of stock The coating systems have to change from time to time to be renewed. To do this, the old coatings using the usual mechanical, chemical or thermal process detached and removed.

Beim mechanischen Verfahren wird die alte Beschichtung meist mittels eines Hochdruckstrahlverfahrens von der Metalloberfläche abgetragen, beim chemischen Verfahren werden entsprechende Lösungsmittel verwendet. Beide Verfahren erfordern allerdings besondere Maßnahmen, wie Einhausung der Metallkonstruktion, um die hierbei ver­ stärkt auftretende Umfeld- und Umweltbelastung einzudäm­ men.In the mechanical process, the old coating mostly by means of a high pressure jet process from the Metal surface removed during the chemical process appropriate solvents are used. Both However, procedures require special measures such as Enclosure of the metal construction, to which ver strengthens occurring environmental and environmental pollution men.

Bekannt ist weiterhin ein Verfahren alte Beschichtungen von Metalloberflächen mittels Wärme abzutragen. Bei diesem Verfahren wird eine zu entfernende Farbschicht entweder mittels Flamme oder mittels Heißluftgebläse erwärmt. Dabei werden von oben die Polymere, die die organische Schicht bilden, aufgebrochen bzw. aufgeweicht und mit einem Werkzeug schichtweise abgetragen. Es er­ weist sich allerdings von Nachteil, daß bei diesem Ver­ fahren die Wärme von der Außenseite her der Schicht zugeführt wird, da ein tieferes Eindringen der Wärme, um auch die Grenzschicht zwischen Metall und Beschichtung zu erwärmen, die Oberfläche sehr stark aufheizt, so daß diese unter Umständen unter Abgabe von Dämpfen ver­ brennt.A process of old coatings is also known to be removed from metal surfaces using heat. At This process uses a layer of paint to be removed either by flame or by hot air gun warmed up. The polymers that form the form organic layer, broken or softened and removed in layers with a tool. It he has the disadvantage, however, that in this ver  drive the heat from the outside of the layer is fed as a deeper penetration of heat to also the boundary layer between metal and coating to heat, the surface heats up very strongly, so that this under certain circumstances with release of vapors burns.

Alle vorbekannten Verfahren haben darüber hinaus den Nachteil, daß bei einer Mehrschichtbeschichtung sukzessi­ ve immer nur eine Schicht nach der anderen abgetragen werden kann.All previously known methods also have the Disadvantage that successively with a multilayer coating I've only removed one layer at a time can be.

Der Erfindung liegt daher die Aufgabe zugrunde Beschich­ tungen von Metalloberflächen auf einfache Weise vollstän­ dig abzulösen.The invention is therefore the object of Beschich metal surfaces in a simple way dig to replace.

Gelöst wird diese Aufgabe erfindungsgemäß durch ein Verfahren nach dem Hauptanspruch. Die Unteransprüche stellen vorteilhafte Verfahrenswege dar.According to the invention, this object is achieved by a Procedure according to the main claim. The subclaims represent advantageous procedures.

Das mit der zu entfernenden Beschichtung versehene Me­ tallbauteil wird zur Erwärmung einem elektromagnetischen Wechselfeld ausgesetzt. Dadurch wird im Metall ein elek­ trischer Wirbelstrom induziert. Aufgrund des Ohmschen Widerstandes des Metalls entsteht Wärme, die die Tempera­ tur des Metalls erhöht. Die Erhöhung der Metalltempera­ tur führt zu einem Aufbrechen der Vernetzung der Be­ schichtung an der Grenzschicht zum Metall, und damit zu einer Aufhebung der Haftung zwischen Schicht und Metall­ oberfläche. Übliche Farbbeschichtungen erfordern ein Erhitzen der Stahloberfläche auf etwa 180°C. Die dann abgelöste Schicht kann mit einem Werkzeug, z. B. einem Spachtel entfernt werden.The Me provided with the coating to be removed tall component is used to heat an electromagnetic Alternating field exposed. As a result, an elec trical eddy current induced. Because of the ohmic Resistance of the metal creates heat that the tempera the metal increased. The increase in metal tempera leads to a break in the networking of the Be layering at the interface with the metal, and thus too a removal of the adhesion between layer and metal surface. Usual color coatings require one Heat the steel surface to about 180 ° C. The then detached layer can with a tool such. B. one Spatula to be removed.

Es erweist sich von Vorteil, ein hochfrequentes elektro­ magnetisches Wechselfeld zu verwenden, das vorzugsweise in einer Induktionsspule erzeugt wird. Bei diesem Verfah­ ren werden aufgrund des sogenannten Skin-Effekts die Wirbelströme nicht im Volumen des Metalls, sondern auf der Metalloberfläche erzeugt. Das heißt, nur die Grenz­ schicht wird erwärmt.It proves advantageous to have a high frequency electro  to use alternating magnetic field, which is preferred is generated in an induction coil. With this procedure due to the so-called skin effect Eddy currents not in the volume of the metal, but on of the metal surface. That is, only the borders layer is heated.

Der besondere Vorteil gegenüber dem konventionellen Wärmeverfahren liegt darin begründet, daß hier die Wärme nicht durch die teilweise aus vielen Einzelschichten bestehende Beschichtung zur Grenzschicht gelangt, son­ dern an dieser direkt entsteht. Es braucht also nicht Schicht für Schicht abgetragen zu werden, das Ablösen der Schicht geschieht vielmehr durch Aufbrechen der chemischen Verbindung der Grundbeschichtung und damit der Aufhebung der Haftung des gesamten Schichtsystems auf der Metalloberfläche. Das Entstehen von Dämpfen und anderen schädlichen Auswirkungen beim Entfernen von Altbeschichtungen auf die Umwelt werden bei diesem Ver­ fahren stark reduziert.The particular advantage over the conventional Heating process is based on the fact that here the heat not because of the many individual layers existing coating reaches the boundary layer, son which arises directly from it. So it doesn't need to To be removed layer by layer, the detachment the layer happens rather by breaking the chemical compound of the base coating and thus the removal of liability of the entire shift system on the metal surface. The generation of vapors and other harmful effects when removing Old coatings on the environment are in this Ver driving greatly reduced.

Die örtliche induktive Erwärmung der Metalloberfläche erfolgt z. B. mit einer von Hand bewegten Induktionsspu­ le, die über Kabelverbindung mit einem Hochfrequenzgene­ rator verbunden sein kann. Entsprechend der Form des die abzutragende Beschichtung tragenden Metallbauteils wird diese Induktionsspule schnell mehrmals über die Be­ schichtungssystemoberfläche gezogen, bis die Metallober­ fläche an der Grenzschicht auf die nötige Temperatur erhitzt ist. Die Beschichtungen des Systems erwärmen sich hierbei nicht von oben nach unten oder plasti­ zieren, sondern die Erwärmung erfolgt indirekt von der Metalloberfläche in die Grundbeschichtung. Es erfolgt keine Reelastisierung des Beschichtungssystems sondern in Folge des Aufbrechens der chemischen Verbindung der Grundbeschichtung die Aufhebung der Systemhaftung auf der Stahloberfläche. Das Beschichtungssystem läßt sich mechanisch z. B. mittels Spachtel abtragen.The local inductive heating of the metal surface z. B. with a hand-held induction coil le, which is wired to a radio frequency gene rator can be connected. According to the shape of the to be removed coating bearing metal component this induction coil quickly several times over the loading layered system surface until the metal top area at the boundary layer to the required temperature is heated. Warm the coatings on the system do not move from top to bottom or plasti grace, but the heating takes place indirectly from the Metal surface in the base coat. It takes place no re-elasticization of the coating system but as a result of the breaking of the chemical compound of the  Primer coating the lifting of system liability the steel surface. The coating system can be mechanically z. B. remove with a spatula.

In der vorhergehenden Beschreibung ist von einer speziel­ len Verfahrensvariante ausgegangen worden; ein Verfahren gemäß der Erfindung kann aber selbstverständlich auch auf andere Weisen ausgeführt werden, wobei eine Reihe von Modifikationen vorgenommen werden können, z. B. kann bei großen Metalloberflächen die Induktionsspule auf andere Weisen als von Hand bewegt werden.In the previous description, one is specific len process variant has been assumed; a procedure according to the invention can of course also run in other ways, taking a number of modifications can be made, e.g. B. can the induction coil on large metal surfaces ways other than being moved by hand.

Alle in der Beschreibung erwähnten neuen Merkmale sind erfindungswesentlich, auch soweit sie in den Ansprüchen nicht ausdrücklich beansprucht werden.All of the new features mentioned in the description are essential to the invention, also insofar as they are in the claims are not expressly claimed.

Claims (4)

1. Verfahren zum Entfernen von Anstrichbeschichtungen auf Metalloberflächen, bei welchen die Beschichtung erwärmt und anschließend abgekratzt oder dergleichen wird, gekennzeichnet durch eine indirekte Erwärmung der Anstrichbeschichtung über die Erwärmung der Oberfläche des Metallteils mittels eines elektromagnetischen Wech­ selfeldes.1. A method for removing paint coatings on metal surfaces, in which the coating is heated and then scraped off or the like, characterized by an indirect heating of the paint coating by heating the surface of the metal part by means of an electromagnetic alternating field. 2. Verfahren, insbesondere nach Anspruch 1, dadurch gekennzeichnet, daß das elektromagnetische Wechselfeld ein Hochfrequenzwechselfeld ist.2. The method, in particular according to claim 1, characterized characterized that the alternating electromagnetic field is a high frequency alternating field. 3. Verfahren, insbesondere nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das elektromagnetische Wechselfeld von einer Induktions­ spule erzeugt wird.3. Method, in particular according to one or more of the preceding claims, characterized in that the alternating electromagnetic field from an induction coil is generated. 4. Verfahren, insbesondere nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Induktionsspule über die beschichtete Metalloberflä­ che bewegt wird.4. The method, in particular according to one or more of the preceding claims, characterized in that the induction coil over the coated metal surface che is moved.
DE19893927432 1989-08-19 1989-08-19 Removing paint coatings from metal surfaces - by heating with electromagnetic alternating field and scraping off paint Withdrawn DE3927432A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893927432 DE3927432A1 (en) 1989-08-19 1989-08-19 Removing paint coatings from metal surfaces - by heating with electromagnetic alternating field and scraping off paint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893927432 DE3927432A1 (en) 1989-08-19 1989-08-19 Removing paint coatings from metal surfaces - by heating with electromagnetic alternating field and scraping off paint

Publications (1)

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DE3927432A1 true DE3927432A1 (en) 1991-02-21

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0614707A1 (en) * 1993-02-10 1994-09-14 MANNESMANN Aktiengesellschaft Method and apparatus for removing an organic coating from metallic hollow bodies
DE4343578A1 (en) * 1993-12-21 1995-06-22 Rettenmaier Horst Dr Inductive heating device for conductive workpieces
WO1997000141A2 (en) * 1995-06-16 1997-01-03 David Grant Lingnau Apparatus and method for high frequency induction heating for the removal of coatings from metal surfaces
EP0759138A1 (en) * 1995-02-24 1997-02-26 Grass America, Inc. System for cleaning fixtures utilized in spray painting
WO1998009828A1 (en) * 1996-09-05 1998-03-12 Ema Elektro-Maschinen Schultze Gmbh & Co. Kg Method and device to remove paint from covering and/or support elements in a paint installation
FR2797805A1 (en) * 1999-08-27 2001-03-02 Tessag Tech Systeme & Services METHOD AND DEVICE FOR REMOVING PAINT LAYERS FROM METAL LATTICE PYLONES OF HIGH VOLTAGE OVERHEAD LINES
AT501821B1 (en) * 2005-04-26 2007-01-15 Htc Systems Gmbh & Co Kg AUTOMATIC DELAMINATION TOOL
WO2013060536A3 (en) * 2011-10-24 2013-11-07 Bauer Martin-Uwe Cleaning of transport carriages
US9826577B2 (en) 2014-08-08 2017-11-21 Ralph Meichtry Method and device for removing dents
US12070784B2 (en) 2016-09-13 2024-08-27 Ralph Meichtry Method and device for removing dents

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477411A (en) * 1944-06-10 1949-07-26 Linde Air Prod Co Metal surface conditioning apparatus and process
FR1082466A (en) * 1952-08-22 1954-12-29 Basf Ag Process for the removal of corrosion deposits
DE2300101A1 (en) * 1972-01-04 1973-07-19 Tri Innovations Ab DEVICE FOR REMOVING COMBUSTIBLE CONTAMINATION FROM INCOMBUSTIBLE PARTS, IN PARTICULAR FROM WORKPIECE HOLDER IN SURFACE TREATMENT DEVICES
DE2752401A1 (en) * 1977-11-24 1979-05-31 Gelsenberg Faserwerke Gmbh Removing thermoplastics from metals by induction heating - esp. from spinning nozzles used for mfg. synthetic fibres
US4511407A (en) * 1982-11-01 1985-04-16 Electric Power Research Institute, Inc. Method of cleaning corroded metal articles by induction heating

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477411A (en) * 1944-06-10 1949-07-26 Linde Air Prod Co Metal surface conditioning apparatus and process
FR1082466A (en) * 1952-08-22 1954-12-29 Basf Ag Process for the removal of corrosion deposits
DE2300101A1 (en) * 1972-01-04 1973-07-19 Tri Innovations Ab DEVICE FOR REMOVING COMBUSTIBLE CONTAMINATION FROM INCOMBUSTIBLE PARTS, IN PARTICULAR FROM WORKPIECE HOLDER IN SURFACE TREATMENT DEVICES
DE2752401A1 (en) * 1977-11-24 1979-05-31 Gelsenberg Faserwerke Gmbh Removing thermoplastics from metals by induction heating - esp. from spinning nozzles used for mfg. synthetic fibres
US4511407A (en) * 1982-11-01 1985-04-16 Electric Power Research Institute, Inc. Method of cleaning corroded metal articles by induction heating

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0614707A1 (en) * 1993-02-10 1994-09-14 MANNESMANN Aktiengesellschaft Method and apparatus for removing an organic coating from metallic hollow bodies
DE4343578A1 (en) * 1993-12-21 1995-06-22 Rettenmaier Horst Dr Inductive heating device for conductive workpieces
EP0759138A4 (en) * 1995-02-24 1998-06-10 Grass America Inc System for cleaning fixtures utilized in spray painting
EP0759138A1 (en) * 1995-02-24 1997-02-26 Grass America, Inc. System for cleaning fixtures utilized in spray painting
US5660753A (en) * 1995-06-16 1997-08-26 Lingnau; David Grant Apparatus for high frequency induction heating for the removal of coatings from metal surfaces
WO1997000141A3 (en) * 1995-06-16 1997-10-02 David Grant Lingnau Apparatus and method for high frequency induction heating for the removal of coatings from metal surfaces
WO1997000141A2 (en) * 1995-06-16 1997-01-03 David Grant Lingnau Apparatus and method for high frequency induction heating for the removal of coatings from metal surfaces
WO1998009828A1 (en) * 1996-09-05 1998-03-12 Ema Elektro-Maschinen Schultze Gmbh & Co. Kg Method and device to remove paint from covering and/or support elements in a paint installation
DE19635963A1 (en) * 1996-09-05 1998-03-12 Ema Elektro Maschinen Schultze Method and an apparatus for stripping paint from cover and / or carrier elements of a painting installation
FR2797805A1 (en) * 1999-08-27 2001-03-02 Tessag Tech Systeme & Services METHOD AND DEVICE FOR REMOVING PAINT LAYERS FROM METAL LATTICE PYLONES OF HIGH VOLTAGE OVERHEAD LINES
AT413022B (en) * 1999-08-27 2005-10-15 Tessag Tech Systeme & Services METHOD AND DEVICE FOR REMOVING COLOR COATINGS APPLIED TO STEEL GRILLE MACHINES OF HIGH VOLTAGE FREEDOMS
DE19940732B4 (en) * 1999-08-27 2009-07-09 Starkstrom-Anlagen-Gesellschaft Mbh Method of removing paint coatings on steel lattice towers of overhead power lines
AT501821B1 (en) * 2005-04-26 2007-01-15 Htc Systems Gmbh & Co Kg AUTOMATIC DELAMINATION TOOL
WO2013060536A3 (en) * 2011-10-24 2013-11-07 Bauer Martin-Uwe Cleaning of transport carriages
US9826577B2 (en) 2014-08-08 2017-11-21 Ralph Meichtry Method and device for removing dents
US10708983B2 (en) 2014-08-08 2020-07-07 Ralph Meichtry Method and device for removing dents
US12070784B2 (en) 2016-09-13 2024-08-27 Ralph Meichtry Method and device for removing dents

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