EP0027778B1 - Process for annealing and degreasing thin strips and foils made of aluminium or aluminium alloys - Google Patents
Process for annealing and degreasing thin strips and foils made of aluminium or aluminium alloys Download PDFInfo
- Publication number
- EP0027778B1 EP0027778B1 EP80810308A EP80810308A EP0027778B1 EP 0027778 B1 EP0027778 B1 EP 0027778B1 EP 80810308 A EP80810308 A EP 80810308A EP 80810308 A EP80810308 A EP 80810308A EP 0027778 B1 EP0027778 B1 EP 0027778B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- annealing
- degreasing
- aluminium
- thin strips
- ozone
- 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
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
Definitions
- the invention relates to a method for degreasing annealing thin strips and foils made of aluminum and aluminum alloys in an annealing furnace.
- foils - petroleum-based lubricating oils or aqueous lubricating oil emulsions are used as rolling aids, with paraffin-based petroleum with additives such as palm kernel fat, long-chain alkyl alcohols, monocarboxylic acid alkyl esters, etc. being used predominantly today.
- the foils wound into rolls are then annealed in large chamber furnaces in dry air. This annealing operation causes degreasing, i.e. the film surface is freed from the wafers on top. As a result of the annealing, the film is also converted from the hard-rolled to the soft state required for certain subsequent operations.
- annealing temperature is understood here as below to mean the metal temperature - the individual foil webs are more or less firmly attached to one another.
- the adhesive effect increases sharply with increasing annealing temperature.
- annealing temperatures above about 400 ° C discolouration of the film surface can also occur. Film rolls whose film webs have a tendency to stick can only be processed with difficulty in a subsequent refinement.
- the operational degreasing annealing process is handled today in such a way that the film rolls are annealed in a chamber furnace at a metal temperature of 250 to 300 ° C, whereby annealing times of between 30 and 60 hours are required, depending on the roll width, for the complete removal of Walzoel residues.
- annealing times of between 30 and 60 hours are required, depending on the roll width, for the complete removal of Walzoel residues.
- an occasional scrap of adhesive film is accepted.
- the relatively long glow times temporarily lead to a lack of free glow capacity and also represent a not insignificant cost factor.
- the invention is therefore based on the object of influencing the degreasing annealing process in such a way that the annealing times can be shortened and the tendency to stick of foils wound into rolls is further reduced.
- the object is achieved by adding ozone to the annealing furnace atmosphere.
- a tendency to stick can practically no longer be determined even at annealing temperatures around 400 ° C. This is not to be expected easily if the degreasing annealing process is accelerated biologically.
- the reduced tendency to stick may be related to a structural change in the oxide layer produced on the film surface by degreasing during the degreasing treatment.
- a completely residue-free film surface can be achieved even at annealing temperatures around 150 ° C. This can be used, for example, if, in the case of degreasing annealing, a simultaneous transfer of the foils from the hard-rolled to the soft state is not desired.
- the following example shows the advantages of an eg grease annealing in an ozone-containing annealing furnace atmosphere.
- the annealing furnace atmosphere consisted of dried synthetic air with and without the addition of ozone.
- ozone 0.2 vol% ozone was added to the purge gas.
- the purge gas flow through the annealing furnace was 185 cm 3 / min in each case.
- the wettability of the film surface was used to assess the degreasing, the diameter of a water drop of 5 ⁇ l being used as a measure.
- the film rolls were stored horizontally practically smoothly.
- the force converted to a film width of 1 mm is called the adhesive force.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Laminated Bodies (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Amplifiers (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Conductive Materials (AREA)
- Tunnel Furnaces (AREA)
- Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Entfettungsglühen von dünnen Bändern und Folien aus Aluminium und Aluminiumlegierungen in einem Glühofen.The invention relates to a method for degreasing annealing thin strips and foils made of aluminum and aluminum alloys in an annealing furnace.
Bei der Walzverformung von Aluminiumbändern zu dünnen Bändern und Folien - nachstehend insgesamt als Folien bezeichnet - werden als Walzhilfsmittel petrolbasische Schmieroele oder auch wässrige Schmieroelemulsionen verwendet, wobei heute überwiegend paraffinbasische Petrole mit Zusätzen von Additivs, wie Palmkernfett, langkettigen Alkylalkoholen, Monocarbonsäurealkylestern usw. eingesetzt werden. Die zu Rollen gewickelten Folien werden anschliessend In grossen Kammeröfen in trockener Luft geglüht. Diese Glühoperation bewirkt eine Entfettung, d.h. die Folienoberfläche wird von den aufliegenden Walzoelfilmen befreit. Durch die Glühung wird die Folie ausserdem vom walzharten in den für gewisse Folgeoperationen erforderlichen weichen Zustand überführt.When rolling aluminum strips into thin strips and foils - hereinafter referred to collectively as foils - petroleum-based lubricating oils or aqueous lubricating oil emulsions are used as rolling aids, with paraffin-based petroleum with additives such as palm kernel fat, long-chain alkyl alcohols, monocarboxylic acid alkyl esters, etc. being used predominantly today. The foils wound into rolls are then annealed in large chamber furnaces in dry air. This annealing operation causes degreasing, i.e. the film surface is freed from the wafers on top. As a result of the annealing, the film is also converted from the hard-rolled to the soft state required for certain subsequent operations.
Nach der Entfettungsglühung wird beobachtet, dass bei der Anwendung von Glühtemperaturen höher als 250 °C - unter Glühtemperatur wird hier wie auch im folgenden die Metalltemperatur verstanden - die einzelnen Folienbahnen mehr oder weniger fest aneinandet kieben. Die Klebewirkung nimmt mit steigender Glühtemperatur stark zu. Bei Glühtemperaturen oberhalb etwa 400 °C können zudem Verfärbungen der Folienoberfläche auftreten. Folienrollen, deren Folienbahnen Klebeneigung aufweisen, können bei einer nachfolgenden Veredelung nur mit Mühe weiterverarbeitet werden.After degreasing annealing, it is observed that when annealing temperatures higher than 250 ° C are used - annealing temperature is understood here as below to mean the metal temperature - the individual foil webs are more or less firmly attached to one another. The adhesive effect increases sharply with increasing annealing temperature. At annealing temperatures above about 400 ° C, discolouration of the film surface can also occur. Film rolls whose film webs have a tendency to stick can only be processed with difficulty in a subsequent refinement.
Das betriebliche Entfettungsglühverfahren wird heute derart gehandhabt, dass die Folienrollen in einem Kammerofen bei einer Metalltemperatur von 250 bis 300 °C geglüht werden, wobei zur vollständigen Entfernung von Walzoelrückständen je nach Rollenbreite Glühzeiten zwischen etwa 30 und 60 h erforderlich sind. Hierbei wird ein gelegentlicher Ausschuss an klebender Folie in Kauf genommen. Die verhältnismässig langen Glühzeiten führen zeitweilig zu einem Mangel an freier Glühkapazität und stellen überdies einen nicht unwesentlichen Kostenfaktor dar.The operational degreasing annealing process is handled today in such a way that the film rolls are annealed in a chamber furnace at a metal temperature of 250 to 300 ° C, whereby annealing times of between 30 and 60 hours are required, depending on the roll width, for the complete removal of Walzoel residues. Here, an occasional scrap of adhesive film is accepted. The relatively long glow times temporarily lead to a lack of free glow capacity and also represent a not insignificant cost factor.
Der Erfindung liegt deshalb die Aufgabe zugrunde, den Entfettungsglühprozess derart zu beeinflussen, dass die Glühzeiten verkürzt werden können und die Klebeneigung von zu Rollen aufgewickelten Folien weiter vermindert wird.The invention is therefore based on the object of influencing the degreasing annealing process in such a way that the annealing times can be shortened and the tendency to stick of foils wound into rolls is further reduced.
Die Aufgabe wird dadurch gelöst, dass der Glühofenatmosphäre Ozon zugeführt wird.The object is achieved by adding ozone to the annealing furnace atmosphere.
Durch die Anwesenheit von Ozon in der Glühofenatmosphäre tritt eine erhebliche Beschleunigung der oxidativen Abbaureaktionen von Walzoelkomponenten ein. Im Vergleich zu einer ozonfreien Atmosphäre wird eine vollständige Entfettung der Folienoberfläche schon nach einer um ca. 30% kürzeren Glühzeit erreicht.The presence of ozone in the annealing furnace atmosphere significantly accelerates the oxidative degradation reactions of Walzoel components. Compared to an ozone-free atmosphere, complete degreasing of the film surface is achieved after an annealing time that is approximately 30% shorter.
Eine Klebeneigung lässt sich selbst bei Glühtemperaturen um 400 °C praktisch nicht mehr feststellen. Dies ist bei einer biossen Beschleunigung des Entfettungsglühvorganges nicht ohne weiteres zu erwarten. Möglicherweise steht die verminderte Klebeneigung in-Zusammenhang mit einer durch den akitivierten Sauerstoff hervorgerufenen, strukturellen Veränderuing der bei der Entfettungsglühung auf der Folienoberfläche erzeugten Oxidschicht.A tendency to stick can practically no longer be determined even at annealing temperatures around 400 ° C. This is not to be expected easily if the degreasing annealing process is accelerated biologically. The reduced tendency to stick may be related to a structural change in the oxide layer produced on the film surface by degreasing during the degreasing treatment.
In ozonhaltiger Atmosphäre kann eine vollständig rückstandsfreie Folienoberfläche schon bei Glühtemperaturen um 150 °C erreicht werden. Dies kann beispielsweise dann ausgenützt werden, wenn bei einer Entfettungsglühung nicht eine gleichzeitige Ueberführung der Folien vom walzharten in den weichen Zustand erwünscht ist.In an ozone-containing atmosphere, a completely residue-free film surface can be achieved even at annealing temperatures around 150 ° C. This can be used, for example, if, in the case of degreasing annealing, a simultaneous transfer of the foils from the hard-rolled to the soft state is not desired.
Das nachfolgende Beispiel zeigt die Vorteilhaftigkeit einen Egifettungsglühung in ozonhaltiger Glühofenatmosphäre.The following example shows the advantages of an eg grease annealing in an ozone-containing annealing furnace atmosphere.
In einem Laborglühofen wurden Rollen mit 5µm dicker.Folie aus Reinaluminium unter verschiedenen Bedingungen entfettungsgeglüht. Zum Kaltwalzen der Folie wurde als Walzoel ein paraffinbasisches Petrol mit einem Zusatz von Palmkernfett verwendet. Die 35 mm breiten Folien wurden auf Hülsen von 40 mm Durchmesser aufgewickelt. Der Durchmesser der so hergestellten Folienrollen betrug 60 mm.In a laboratory annealing furnace, rolls with 5 µm thick foil made of pure aluminum were degreased under various conditions. For the cold rolling of the film, a paraffin-based petroleum with an addition of palm kernel fat was used as the Walzoel. The 35 mm wide foils were wound on tubes with a diameter of 40 mm. The diameter of the film rolls produced in this way was 60 mm.
Die Glühofenatmosphäre bestand aus getrockneter synthetischer Luft mit und ohne Zusatz von Ozon. Bei den Versuchen mit Ozon wurde dem Spülgas 0,2 Vol.-% Ozon zugesetzt. Der Spülgasfluss durch den Glühofen betrug jeweils 185 cm3/min.The annealing furnace atmosphere consisted of dried synthetic air with and without the addition of ozone. In the experiments with ozone, 0.2 vol% ozone was added to the purge gas. The purge gas flow through the annealing furnace was 185 cm 3 / min in each case.
Zur Beurteilung der Entfettung wurde die Benetzbarkeit der Folienoberfläche herangezogen, wobei als Mass der Durchmesser eines aufgesetzten Wassertropfens von 5 al diente. Zur Bestimmung der Ktebeneigung wurden die Folienrollen praktisch reibungslos horizontal gelagert. Durch anhängen von Gewichten an das freie Folienende wurde die kritische Last ermittelt, bei welcher sich die Folien selbstätig abzuwickeln beginnen. Die auf eine Folienbreite von 1 mm umgerechnete Kraft wird als Klebekraft bezeichnet.The wettability of the film surface was used to assess the degreasing, the diameter of a water drop of 5 μl being used as a measure. In order to determine the inclination of the film, the film rolls were stored horizontally practically smoothly. By attaching weights to the free end of the film, the critical load at which the films begin to unwind automatically was determined. The force converted to a film width of 1 mm is called the adhesive force.
Die wesentlichsten Versuchsergebnisse sind in der nachstehenden Tabelle zusammengefasst. Aus dieser Tabelle geht deutlich hervor, dass bei einem Ozonzusatz zur Glühofenatmosphäre die Klebeneigung über den ganzen Bereich der untersuchten Glühtemperaturen vermindert wird. Zur praktisch vollständigen Entfettung der Folienoberfläche sind wesentlich kürzere Glühzeiten erforderlich.
Claims (1)
- Process for annealing and degreasing thin strips and foils made of aluminium and aluminium alloys in an annealing furnace, characterised in that ozone is introduced into the annealing furnace atmosphere.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT80810308T ATE1590T1 (en) | 1979-10-18 | 1980-10-06 | PROCESS FOR DEGREASING THIN STRIPS AND FOILS OF ALUMINUM AND ALUMINUM ALLOYS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH9355/79 | 1979-10-18 | ||
CH935579 | 1979-10-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0027778A1 EP0027778A1 (en) | 1981-04-29 |
EP0027778B1 true EP0027778B1 (en) | 1982-09-22 |
Family
ID=4351104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80810308A Expired EP0027778B1 (en) | 1979-10-18 | 1980-10-06 | Process for annealing and degreasing thin strips and foils made of aluminium or aluminium alloys |
Country Status (10)
Country | Link |
---|---|
US (1) | US4325753A (en) |
EP (1) | EP0027778B1 (en) |
JP (1) | JPS5665969A (en) |
AT (1) | ATE1590T1 (en) |
CA (1) | CA1154364A (en) |
DE (2) | DE2948090C2 (en) |
ES (1) | ES495883A0 (en) |
FI (1) | FI66208C (en) |
NO (1) | NO803094L (en) |
YU (1) | YU262480A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103131972A (en) * | 2011-12-01 | 2013-06-05 | 湖南晟通科技集团有限公司 | Aluminum foil continuous annealing method and aluminum foil continuous annealing furnace |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5016809A (en) * | 1989-09-05 | 1991-05-21 | Ford Motor Company | Thermal degreasing in reactive atmospheres and subsequent brazing of aluminum-based sheets or parts |
JP2002090978A (en) | 2000-09-12 | 2002-03-27 | Hoya Corp | Method of manufacturing phase shift mask blank and apparatus for manufacturing phase shift mask blank |
US7275982B1 (en) | 2006-05-12 | 2007-10-02 | Ozone International, Llc | Ozone-based conveyor cleaning system |
US20090277342A1 (en) * | 2008-05-08 | 2009-11-12 | Jetton John P | Ozone treating system and method |
CN105714098A (en) * | 2016-04-18 | 2016-06-29 | 河南金阳铝业有限公司 | Aluminium foil annealing trolley with uniform temperature |
CN110195197B (en) * | 2019-06-20 | 2020-10-09 | 乳源东阳光优艾希杰精箔有限公司 | Annealing and oil removing method for aluminum coil |
CN115647051A (en) * | 2022-12-06 | 2023-01-31 | 洛阳万基铝加工有限公司 | Aluminum foil surface cleaning treatment method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2824819A (en) * | 1956-05-11 | 1958-02-25 | Millard F Smith | Method for oxide insulating aluminum conductors |
US3061485A (en) * | 1960-12-12 | 1962-10-30 | Reynolds Metals Co | Residual lubricant removal from aluminum foil |
GB1082251A (en) * | 1964-02-11 | 1967-09-06 | Aluminium Foils Ltd | Method of heat treatment of aluminium foil |
-
1979
- 1979-11-29 DE DE2948090A patent/DE2948090C2/en not_active Expired
-
1980
- 1980-09-22 US US06/189,174 patent/US4325753A/en not_active Expired - Lifetime
- 1980-09-25 FI FI803013A patent/FI66208C/en not_active IP Right Cessation
- 1980-10-06 EP EP80810308A patent/EP0027778B1/en not_active Expired
- 1980-10-06 DE DE8080810308T patent/DE3060879D1/en not_active Expired
- 1980-10-06 AT AT80810308T patent/ATE1590T1/en active
- 1980-10-13 YU YU02624/80A patent/YU262480A/en unknown
- 1980-10-13 ES ES495883A patent/ES495883A0/en active Granted
- 1980-10-15 CA CA000362422A patent/CA1154364A/en not_active Expired
- 1980-10-16 NO NO803094A patent/NO803094L/en unknown
- 1980-10-17 JP JP14555180A patent/JPS5665969A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103131972A (en) * | 2011-12-01 | 2013-06-05 | 湖南晟通科技集团有限公司 | Aluminum foil continuous annealing method and aluminum foil continuous annealing furnace |
CN103131972B (en) * | 2011-12-01 | 2016-09-28 | 湖南晟通科技集团有限公司 | A kind of aluminium foil continuous annealing method and aluminium foil continuous annealing furnace |
Also Published As
Publication number | Publication date |
---|---|
NO803094L (en) | 1981-04-21 |
DE2948090B1 (en) | 1980-11-13 |
JPS5665969A (en) | 1981-06-04 |
YU262480A (en) | 1983-09-30 |
FI66208B (en) | 1984-05-31 |
ATE1590T1 (en) | 1982-10-15 |
US4325753A (en) | 1982-04-20 |
EP0027778A1 (en) | 1981-04-29 |
FI803013A (en) | 1981-04-19 |
ES8201225A1 (en) | 1981-12-01 |
CA1154364A (en) | 1983-09-27 |
DE2948090C2 (en) | 1981-06-19 |
DE3060879D1 (en) | 1982-11-04 |
ES495883A0 (en) | 1981-12-01 |
FI66208C (en) | 1984-09-10 |
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