EP0640152B1 - Process for enamelling steel strip - Google Patents
Process for enamelling steel strip Download PDFInfo
- Publication number
- EP0640152B1 EP0640152B1 EP93909357A EP93909357A EP0640152B1 EP 0640152 B1 EP0640152 B1 EP 0640152B1 EP 93909357 A EP93909357 A EP 93909357A EP 93909357 A EP93909357 A EP 93909357A EP 0640152 B1 EP0640152 B1 EP 0640152B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- stoving
- treatment
- powder
- coated
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 238000000137 annealing Methods 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000011282 treatment Methods 0.000 claims description 11
- 210000003298 dental enamel Anatomy 0.000 claims description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- 150000002739 metals Chemical class 0.000 claims 1
- 239000002320 enamel (paints) Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000011328 necessary treatment Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D5/00—Coating with enamels or vitreous layers
- C23D5/04—Coating with enamels or vitreous layers by dry methods
Definitions
- the invention relates to a method for enamel coating by means of powder coating and subsequent baking of endless steel strips finished by annealing.
- DE-PS 35 36 040 discloses a method for coating on both sides with a base enamel layer and a cover enamel layer to be applied to it on at least one side of tapes guided over rollers in a non-contact continuous pass through baking ovens with heating and cooling zones, in which the tapes are used Heat treatment after coating is introduced vertically into the baking oven and guided vertically through the baking oven.
- a slip or a powder for the enamel layer to be baked is applied to the cold steel strips supplied, which may have been refined or coated in previous processes by annealing.
- the steel strip with the enamel layer is then heated in the subsequent baking oven branded at the same time.
- Systems of this type are only designed for relatively small output quantities.
- the object of the invention is to propose a method of the type mentioned in the introduction in which high output quantities can be achieved in corresponding systems with a comparatively low energy requirement, systems of the same nature being intended to be used for such a coating.
- the invention makes use of the fact that steel strips to be refined have to be subjected to an annealing treatment at a temperature which represents a suitable temperature level in the subsequent enamel coating.
- the endless steel strips refined by annealing are therefore immediately coated with the same powder in the same heat and heat-treated in a subsequent baking station. There is therefore no need to heat up the steel strip to the necessary treatment level, so that the energy requirement results in a significant acceleration of the process.
- Such a method according to the invention makes it possible to use plants of the same nature, for example hot-dip galvanizing or aluminizing plants and also continuous annealing plants, in which a coating station with subsequent baking treatment is only to be inserted behind the annealing treatment station. It can therefore Existing systems with relatively few additional facilities can be used to carry out the process, which means that the usability of such a system can be considerably higher and the total costs for the finished strip coated with enamel can be reduced.
- Enamel-coated refined steel strips will increasingly replace the usual plastic-coated steel strips, which will only be used to a small extent in the future due to their disadvantages in the case of fires and recycling.
- the invention also includes the proposal to first coat the steel strips with non-ferrous metals or corresponding alloys after the annealing treatment. This intermediate coating also takes place in the same heat. It sometimes has the advantage that the enamel coating is carried out only on one side, the basic enamelling can be omitted, and additional anodic corrosion protection is achieved when using, for example, aluminum or aluminum alloy coatings.
- Burn-in treatment in vertical ovens is an advantage because they are cheap to accommodate due to the space available in such systems.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Drying Of Solid Materials (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Emailbeschichten mittels Pulverbeschichtung und anschließendem Einbrennen von durch Glühbehandlung veredelten endlosen Stahlbändern.The invention relates to a method for enamel coating by means of powder coating and subsequent baking of endless steel strips finished by annealing.
Aus der DE-PS 35 36 040 ist ein Verfahren zur beidseitigen Beschichtung mit einer Grundemail- und einer mindestens auf einer Seite darauf aufzubringenden Deckemailschicht von über Rollen geführten Bändern im berührungsfreien kontinuierlichen Durchlauf durch Einbrennöfen mit Heiz- und Kühlzonen bekannt, bei dem die Bänder zur Wärmebehandlung nach der Beschichtung jeweils vertikal in den Einbrennofen eingeführt und vertikal durch den Einbrennofen geführt werden. Bei diesem bekannten Verfahren wird auf die zugeführten kalten Stahlbänder, die gegebenenfalls in vorausgegangenen Verfahren durch Glühbehandlung veredelt oder auch beschichtet worden sind, ein Schlicker oder ein Pulver für die einzubrennende Emailschicht aufgebracht. In dem nachfolgenden Einbrennofen wird dann das Stahlband mit der Emailschicht erwärmt und gleichzeitig eingebrannt. Anlagen dieser Art sind nur für relativ geringe Ausstoßmengen ausgelegt. Ihr Energiebedarf ist im Hinblick auf die relativ geringen Durchsetzmengen hoch, da nicht nur das aufgebrachte Pulver bzw. der Schlicker, sondern auch das dem gegenüber vergleichsweise materialstarke Stahlband auf die Schmelztemperatur der Emailschicht gebracht werden muß. Bei dem bekannten Verfahren ist eine niedrige Einführungstemperatur der Stahlbänder Voraussetzung, da diese durch ein Schlickerbad und über Umlenkrollen geführt werden.DE-PS 35 36 040 discloses a method for coating on both sides with a base enamel layer and a cover enamel layer to be applied to it on at least one side of tapes guided over rollers in a non-contact continuous pass through baking ovens with heating and cooling zones, in which the tapes are used Heat treatment after coating is introduced vertically into the baking oven and guided vertically through the baking oven. In this known method, a slip or a powder for the enamel layer to be baked is applied to the cold steel strips supplied, which may have been refined or coated in previous processes by annealing. The steel strip with the enamel layer is then heated in the subsequent baking oven branded at the same time. Systems of this type are only designed for relatively small output quantities. Their energy requirements are high in view of the relatively low throughput quantities, since not only the powder or slip applied, but also that of the steel strip, which is comparatively strong compared to the material, must be brought to the melting temperature of the enamel layer. In the known method, a low insertion temperature of the steel strips is a prerequisite, since these are passed through a slip bath and over deflection rollers.
Die Aufgabe der Erfindung besteht darin, ein Verfahren der eingangs genannten Art vorzuschlagen, bei dem mit vergleichsweise geringem Energiebedarf hohe Ausstoßmengen in entsprechenden Anlagen erzielt werden können, wobei wesensgleiche Anlagen nutzbar für eine derartige Beschichtung gemacht werden sollen.The object of the invention is to propose a method of the type mentioned in the introduction in which high output quantities can be achieved in corresponding systems with a comparatively low energy requirement, systems of the same nature being intended to be used for such a coating.
Gelöst wird diese Erfindungsaufgabe mit einem Verfahren gemäß Anspruch 1. Die Erfindung nutzt den Umstand, daß zu veredelnde Stahlbänder einer Glühbehandlung unterzogen werden müssen bei einer Temperatur, die beim anschließenden Emailbeschichten ein geeignetes Temperaturniveau darstellt. Die durch Glühbehandlung veredelten endlosen Stahlbänder werden daher in der gleichen Wärme im sofortigen Anschluß mit entsprechendem Pulver beschichtet und in einer anschließenden Einbrennstation wärmebehandelt. Es entfällt daher die Aufwärmung des Stahlbandes auf das notwendige Behandlungsniveau, so daß der Energiebedarf daher eine wesentliche Beschleunigung des Verfahrens ergibt.This object of the invention is achieved with a method according to claim 1. The invention makes use of the fact that steel strips to be refined have to be subjected to an annealing treatment at a temperature which represents a suitable temperature level in the subsequent enamel coating. The endless steel strips refined by annealing are therefore immediately coated with the same powder in the same heat and heat-treated in a subsequent baking station. There is therefore no need to heat up the steel strip to the necessary treatment level, so that the energy requirement results in a significant acceleration of the process.
Ein solches erfindungsgemäßes Verfahren ermöglicht die Nutzung wesensgleicher Anlagen, beispielsweise Feuerverzinkungs- oder Aluminierungsanlagen sowie auch Kontiglühanlagen, in denen lediglich hinter der Glühbehandlungsstation eine Beschichtungsstation mit anschließender Einbrennungsbehandlung einzufügen ist. Es können daher vorhandene Anlagen mit relativ geringen zusätzlichen Einrichtungen für die Durchführung des Verfahrens herangezogen werden, wodurch die Ausnutzbarkeit einer solchen Anlage erheblich höher werden kann und die Gesamtkosten für das fertige, mit Email beschichtete Band, reduziert werden.Such a method according to the invention makes it possible to use plants of the same nature, for example hot-dip galvanizing or aluminizing plants and also continuous annealing plants, in which a coating station with subsequent baking treatment is only to be inserted behind the annealing treatment station. It can therefore Existing systems with relatively few additional facilities can be used to carry out the process, which means that the usability of such a system can be considerably higher and the total costs for the finished strip coated with enamel can be reduced.
Emailbeschichtete veredelte Stahlbänder werden in zunehmendem Maße die üblichen kunststoffbeschichteten Stahlbänder ablösen, die wegen ihrer Nachteile bei Bränden und im Recycling in Zukunft nur noch in geringem Maße eingesetzt werden.Enamel-coated refined steel strips will increasingly replace the usual plastic-coated steel strips, which will only be used to a small extent in the future due to their disadvantages in the case of fires and recycling.
Zur Erfindung gehört auch der Vorschlag, die Stahlbänder nach der Glühbehandlung zunächst mit NE-Metallen oder entsprechenden Legierungen zu beschichten. Auch diese Zwischenbeschichtung erfolgt in der gleichen Wärme. Sie hat mitunter den Vorteil, daß die Emailbeschichtung nur einseitig erfolgen, die Grundemaillierung entfallen kann, und ein zusätzlicher anodischer Korrosionsschutz erreicht wird, bei Verwendung von zum Beispiel Aluminium- bzw. Aluminiumlegierungsbeschichtungen.The invention also includes the proposal to first coat the steel strips with non-ferrous metals or corresponding alloys after the annealing treatment. This intermediate coating also takes place in the same heat. It sometimes has the advantage that the enamel coating is carried out only on one side, the basic enamelling can be omitted, and additional anodic corrosion protection is achieved when using, for example, aluminum or aluminum alloy coatings.
Von Vorteil ist die Einbrennbehandlung in Vertikalöfen, die wegen des in solchen Anlagen vorhandenen Platzangebotes günstig unterzubringen sind.Burn-in treatment in vertical ovens is an advantage because they are cheap to accommodate due to the space available in such systems.
Claims (5)
- Enamelling method by coating with powder and subsequently stoving annealed endless steel strips, characterised in that, after the annealing treatment, the strips are coated with enamel powder in the same heat and heat-treated after the stoving process.
- Method according to claim 1, characterised in that the steel strips are initially coated with nonferrous metals or corresponding alloys after the annealing treatment.
- Method according to claim 2, characterised in that the steel strip is initially coated with aluminium or an aluminium alloy after the annealing treatment.
- Method according to claim 1, characterised in that the stoving treatment is effected in a vertical furnace.
- Method according to one or more of the preceding claims, characterised in that the coating with enamel powder is effected in a station disposed between the annealing treatment and stoving treatment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4216282 | 1992-05-16 | ||
| DE4216282A DE4216282C1 (en) | 1992-05-16 | 1992-05-16 | |
| PCT/DE1993/000395 WO1993023589A1 (en) | 1992-05-16 | 1993-04-30 | Process for enamelling steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0640152A1 EP0640152A1 (en) | 1995-03-01 |
| EP0640152B1 true EP0640152B1 (en) | 1995-12-06 |
Family
ID=6459089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93909357A Expired - Lifetime EP0640152B1 (en) | 1992-05-16 | 1993-04-30 | Process for enamelling steel strip |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0640152B1 (en) |
| AT (1) | ATE131219T1 (en) |
| AU (1) | AU3979693A (en) |
| DE (1) | DE4216282C1 (en) |
| ES (1) | ES2080617T3 (en) |
| WO (1) | WO1993023589A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4328021C2 (en) * | 1993-08-20 | 1995-05-24 | Hans Josef May | Process for the continuous coating on one or both sides of metal strips with enamel or plastic powders and device for carrying out such a process |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE629135A (en) * | 1961-02-02 | |||
| GB1168239A (en) * | 1968-08-03 | 1969-10-22 | Robertson Co H H | Porcelain Enamelled Aluminized Steel |
| BE790958A (en) * | 1972-11-03 | 1973-03-01 | Centre Rech Metallurgique | Continuously enamelling metal sheet - by applying aluminium to both sides then applying the enamel |
| BR7901119A (en) * | 1978-02-22 | 1979-11-20 | Foseco Int | MARKING OF METAL OBJECTS |
| DE3045249A1 (en) * | 1980-12-01 | 1982-07-01 | Eisenwerke Fried. Wilh. Düker GmbH & Co, 8782 Karlstadt | METHOD FOR APPLYING A RESISTANT PROTECTIVE ENAMEL COVER TO DUCTILE MOLDED BODY |
| DE3536040C1 (en) * | 1985-10-09 | 1987-05-27 | Roland Schnetteler | Process for double-sided coating of tapes with enamel layers |
-
1992
- 1992-05-16 DE DE4216282A patent/DE4216282C1/de not_active Expired - Fee Related
-
1993
- 1993-04-30 AT AT93909357T patent/ATE131219T1/en not_active IP Right Cessation
- 1993-04-30 WO PCT/DE1993/000395 patent/WO1993023589A1/en active IP Right Grant
- 1993-04-30 EP EP93909357A patent/EP0640152B1/en not_active Expired - Lifetime
- 1993-04-30 ES ES93909357T patent/ES2080617T3/en not_active Expired - Lifetime
- 1993-04-30 AU AU39796/93A patent/AU3979693A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| ATE131219T1 (en) | 1995-12-15 |
| WO1993023589A1 (en) | 1993-11-25 |
| ES2080617T3 (en) | 1996-02-01 |
| AU3979693A (en) | 1993-12-13 |
| DE4216282C1 (en) | 1993-06-09 |
| EP0640152A1 (en) | 1995-03-01 |
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