EP2303489A1 - Method for producing an aluminum strip for use in packaging and aluminum strip produced by said method - Google Patents

Method for producing an aluminum strip for use in packaging and aluminum strip produced by said method

Info

Publication number
EP2303489A1
EP2303489A1 EP09732078A EP09732078A EP2303489A1 EP 2303489 A1 EP2303489 A1 EP 2303489A1 EP 09732078 A EP09732078 A EP 09732078A EP 09732078 A EP09732078 A EP 09732078A EP 2303489 A1 EP2303489 A1 EP 2303489A1
Authority
EP
European Patent Office
Prior art keywords
strip
decorative
band
aluminum
elements
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
EP09732078A
Other languages
German (de)
French (fr)
Other versions
EP2303489B1 (en
Inventor
Volker Denkmann
Wolf ÖTTING
Andreas Siemen
Wilhelm Schenkel
Boris Kasper
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.)
Speira GmbH
Original Assignee
Hydro Aluminium Deutschland GmbH
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
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Application filed by Hydro Aluminium Deutschland GmbH filed Critical Hydro Aluminium Deutschland GmbH
Priority to PL09732078T priority Critical patent/PL2303489T3/en
Publication of EP2303489A1 publication Critical patent/EP2303489A1/en
Application granted granted Critical
Publication of EP2303489B1 publication Critical patent/EP2303489B1/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B21H8/005—Embossing sheets or rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12389—All metal or with adjacent metals having variation in thickness

Definitions

  • the invention relates to a method for producing a strip of aluminum or an aluminum alloy, in particular for packaging purposes, preferably for the production of cans, can lids or can closures. Moreover, the invention relates to a band produced by the process according to the invention, in particular for packaging purposes.
  • Aluminum bands exist.
  • An example of such a packaging is a beverage can.
  • An individualization of the packaging can be achieved, for example, via a print which is applied to the packaging material manufacturer.
  • emboss patterns, symbols or other identification elements in, for example, an aluminum strip immediately prior to the production of the packaging means.
  • embossing tools or embossing means are to be provided by the processor of the aluminum strip.
  • an identification element such as a logo
  • the embossing rolls only lead to a plastic deformation of the areas of the strip provided with an identification element.
  • the embossing rolls from the roll surface on protruding areas, which are used for impressing example of a logo.
  • the remaining band areas, ie the band areas lying between the logos, however, are not plastically deformed during embossing.
  • the present invention has the object to provide a method for producing an individualized tape for packaging purposes, with which a secure embossing decor or labeling elements can be made in the band, without additional steps, for example, the packaging materials manufacturer, necessary.
  • the above-described object is achieved in that decorative or other marking elements are embossed into the strip in the last cold pass of the cold rolling and the strip thickness is greater in the area of decorative and identification elements than in the other areas of the strip .
  • the band areas which are not to be embossed by the marking element or the company logo, are reduced more in their thickness than the areas to be embossed, so that they have a greater strip thickness.
  • At least one of the work rolls used in cold rolling has depressions for impressing the decorative or identification elements into the strip, so that in the roll gap the material of the rolled strip flows into the depressions and thus leads to areas of increased strip thickness.
  • the amplitude of the embossing profile in the belt is due to the wells in the work roll a maximum of 4 microns.
  • the depressions of the work roll are preferably laser texturized. However, other methods for producing the depressions in the roller can also be used.
  • both work rolls have corresponding depressions, it is crucial that the band areas, which have no decorative or marking elements, are more strongly reduced in thickness than the other, the decorative or labeling elements having areas.
  • a particularly cost-effective embodiment of the method according to the invention can be provided by stamping on the decorative or
  • Labeling elements inline with the production of the tape for example, for packaging purposes.
  • Inline in this case means that a production line is used for the production of unembossed tapes, and at least one work roll of the last cold roll pass is replaced by a work roll having decorative or marking elements and this work roll impresses the decorating or marking elements into the strip for packaging purposes ,
  • the strip is then wound on a coil on the finish rolling, so that a decorative or marking elements exhibiting tape the further steps, such as steps for producing a can lid or a can closure, can be supplied.
  • a particularly reliable insertion of the decorative or marking elements in the band can be achieved in that the stitch loss during the formative roll pass between 20% and 40%. It has been found that embossing of the strip is possible even with these stitches and leads to particularly good and clean embossing results.
  • Embodiment of the method according to the invention achieved in particular by the last, formative roll pass in a six-high rolling mill.
  • the band end thickness is 0.15 mm to 0.5 mm, preferably 0.2 to 0.35 mm.
  • This final strip thickness is particularly preferably used for the production of packaging, for example, cans, can lids or can closures.
  • the tape can also be used for other purposes or for other packaging.
  • the band consists of a 5xxx aluminum alloy, which also achieves very high strength values in addition to a particularly good forming behavior.
  • the object indicated above is achieved by a strip produced by the method according to the invention, wherein the strip comprises embossed decorative and identification elements and the strip thickness is greater in the region of the decorative or marking elements than in the remaining areas of the strip ,
  • the tape according to the invention is individualized by the embossed decorative or marking elements without additional costs, for example due to a further working step.
  • Fig. 1 is a schematic view of a finishing train for carrying out the method according to the invention for
  • Fig. 2 is a pair of work rolls of the finishing stand of Fig. 1 and
  • Embodiment of a tape according to the invention for packaging purposes.
  • Fig. 1 shows an embodiment of a finishing train 1 for cold rolling an aluminum strip 2, which has been produced for example by hot rolling a billet.
  • the aluminum strip 2 is unwound from an unwinding reel 3 and fed to further processing steps 4.
  • Work steps can consist for example of a cold rolling and a strip-shaped intermediate annealing. They are, however not necessary for the practice of the present invention.
  • the steps 4 can therefore also be omitted, if, for example, the strip is batchwise annealed, ie, wound up on a coil, and then fed to the last pass.
  • the strip is rolled to its final thickness, preferably with a reduction of between 20 and 40%.
  • the work roll 5a recesses for embossing decorative or other labeling elements, which leads in the finish rolling pass for the introduction of areas with increased strip thickness, namely the areas of the decorative or marking elements.
  • the six-high rolling mill other rolling mills are used. So far, however, good embossing results have only been proven on a six-high rolling stand.
  • the aluminum strip thus rolled to final thickness is then wound onto a take-up reel 6. Before winding, however, further work steps, for example a surface treatment, can be carried out.
  • the final thickness of the aluminum strip in the present embodiment is 0.2 to 0.35 mm.
  • Aluminum alloy preferably an aluminum alloy of type 5xxx, enables a particularly high strength and at the same time a good formability of the aluminum strip during further processing, even with the small wall thicknesses.
  • the individualization of the aluminum strip with the method according to the invention makes it possible for the downstream processor to label the products produced therefrom without having to resort to other technologies, for example the additional printing or the like. All additional work steps increase the manufacturing costs which are particularly important for these products.
  • the pair of work rolls 5 a, 5 b used in FIG. 1 is shown schematically in a perspective view. While the work roll 5a has recesses 7 which serve to impress the decorative or marking elements in the aluminum strip, no depressions are provided on the work roll 5b.
  • the tape thus produced therefore, has decorative or
  • Both work rolls 5a, 5b have different cut structures to optimize flow of material into the recesses during finish rolling of the strip, so that flow of the aluminum material into the recesses of the work roll 5a in the roll gap during finish rolling is assisted. But it is also possible that both work rolls have 5a and 5b recesses for impressing decorative or identification elements.
  • an aluminum strip 2 is wound onto a coil for packaging purposes, which has not been so much reduced in thickness in the area of the decorative elements 8 and thus has a greater strip thickness than in the others, not with decorative or identification elements provided areas 9 of the tape. This results in a maximum embossing profile of 4 ⁇ m.

Abstract

The invention relates to a method for producing an aluminum or aluminum allow strip for packaging purposes, in particular for cans, can covers or can closures. The object of providing a method for producing an individualized strip of aluminum for packaging purposes for safely imprinting decorative or identifying elements without the need for additional work steps such as steps by the packaging manufacturer is met by impressing decorative or other identifying elements into the strip (2) in the last rolling pass (5) of the cold-rolling process, and by providing that the strip thickness is larger in the area of the decorative or identifying elements than in the remaining areas of the strip.

Description

VERFAHREN ZUR HERSTELLUNG EINES BANDES AUS ALUMINIUM FÜR VERPACKUNGS ZWECKE UND DERART HERGESTELLTES BAND METHOD FOR THE PRODUCTION OF A STRIP OF ALUMINUM FOR PACKAGING PURPOSES AND TAPE MANUFACTURED THEREOF
Die Erfindung betrifft ein Verfahren zur Herstellung eines Bandes aus Aluminium oder einer Aluminiumlegierung, insbesondere für Verpackungszwecke, vorzugsweise für die Herstellung von Dosen, Dosendeckel oder Dosenverschlüssen. Darüber hinaus betrifft die Erfindung ein nach dem erfindungsgemäßen Verfahren hergestelltes Band, insbesondere für Verpackungszwecke.The invention relates to a method for producing a strip of aluminum or an aluminum alloy, in particular for packaging purposes, preferably for the production of cans, can lids or can closures. Moreover, the invention relates to a band produced by the process according to the invention, in particular for packaging purposes.
Bei der Herstellung von Verpackungen, beispielsweise für Lebensmittel, wird zunehmend eine Individualisierung der Verpackung gewünscht. Diese Individualisierung soll zu einer besseren Identifikation der Verpackung mit dem zugehörigen Produktnamen zum Hersteller führen. Diese Individualisierung betrifft zunehmend auch Verpackungen, welche ausIn the production of packaging, for example for food, an individualization of the packaging is increasingly desired. This individualization should lead to a better identification of the packaging with the associated product name to the manufacturer. This individualization is increasingly affecting packaging, too
Aluminiumbändern bestehen. Ein Beispiel einer solchen Verpackung stellt eine Getränkedose dar. Eine Individualisierung der Verpackungen kann beispielsweise über einen Aufdruck erzielt werden, welcher bei dem Verpackungsmittelhersteller aufgebracht wird. Darüber hinaus besteht die Möglichkeit, unmittelbar vor der Herstellung der Verpackungsmittel Muster, Symbole oder andere Kennzeichnungselemente in beispielsweise ein Aluminiumband einzuprägen. Hierzu sind bei dem Verarbeiter des Aluminiumbandes beispielsweise Prägewerkzeuge oder Prägemittel bereitzustellen. Um dieses zu vermeiden, ist es aus der internationalen Patentanmeldung WO 2006/058424 Al bekannt, das Aluminiumband bereits während der Fertigung durch eine Fertigwalze zu prägen. Um einerseits ein Kennzeichnungselement, beispielsweise ein Logo, in das Aluminiumband zu prägen, wird in der obengenannten internationalen Patentanmeldung vorgeschlagen, dass die Prägewalzen lediglich zu einer plastischen Verformung der mit einem Kennzeichnungselement versehenen Bereiche des Bandes führen. Hierzu weisen die Prägewalzen aus der Walzenoberfläche herausstehende Bereiche auf, welche zum Einprägen beispielsweise eines Logos genutzt werden. Die übrigen Bandbereiche, d.h. die zwischen den Logos liegenden Bandbereiche, werden dagegen während des Prägens nicht plastisch deformiert.Aluminum bands exist. An example of such a packaging is a beverage can. An individualization of the packaging can be achieved, for example, via a print which is applied to the packaging material manufacturer. In addition, it is possible to emboss patterns, symbols or other identification elements in, for example, an aluminum strip immediately prior to the production of the packaging means. For this purpose, for example, embossing tools or embossing means are to be provided by the processor of the aluminum strip. In order to avoid this, it is known from international patent application WO 2006/058424 A1 to emboss the aluminum strip during production by means of a finish roll. On the one hand, an identification element, such as a logo, in the In the abovementioned international patent application, it is proposed in the abovementioned international patent application that the embossing rolls only lead to a plastic deformation of the areas of the strip provided with an identification element. For this purpose, the embossing rolls from the roll surface on protruding areas, which are used for impressing example of a logo. The remaining band areas, ie the band areas lying between the logos, however, are not plastically deformed during embossing.
Problematisch bei diesem Verfahren ist nun, dass ein einwandfreies Prägen der Kennzeichnungselemente, Muster oder Logos eine besonders akribische Einstellung der Prägewalzen erfordert. Es ist daher schwierig ein prozesssicheres Einprägen der Logos in das Band zu gewährleisten.The problem with this method is that proper embossing of the marking elements, patterns or logos requires a particularly meticulous adjustment of the embossing rollers. It is therefore difficult to ensure a reliable embossing of the logos in the band.
Hiervon ausgehend hat sich die vorliegende Erfindung die Aufgabe gestellt, ein Verfahren zur Herstellung eines individualisierten Bandes für Verpackungszwecke zur Verfügung zu stellen, mit welchem ein sicheres Prägen von Dekor- oder Kennzeichnungselementen in das Band erfolgen kann, ohne dass zusätzliche Arbeitsschritte, beispielsweise beim Verpackungsmittelhersteller, notwendig sind.On this basis, the present invention has the object to provide a method for producing an individualized tape for packaging purposes, with which a secure embossing decor or labeling elements can be made in the band, without additional steps, for example, the packaging materials manufacturer, necessary.
Gemäß einer ersten Lehre der vorliegenden Erfindung wird die oben aufgezeigte Aufgabe dadurch gelöst, dass in das Band im letzten Walzstich des Kaltwalzens Dekor- oder andere Kennzeichnungselemente eingeprägt werden und die Banddicke im Bereich der Dekor- und Kennzeichnungselemente größer ist als in den übrigen Bereichen des Bandes. Im Gegensatz zu dem aus dem Stand der Technik bekannten Verfahren werden also die Bandbereiche, welche nicht durch das Kennzeichnungselement oder das Firmenlogo geprägt werden sollen, in ihrer Dicke stärker reduziert als die zu prägenden Bereiche, so dass diese eine größere Banddicke aufweisen. Hierdurch wird ermöglicht, den Prägeschritt in einen Fertigwalzschritt aufzunehmen und den Verfahrensschritt zum Einprägen der Kennzeichnungselemente bzw. Logos gleichzeitig mit einem erhöhten Umformgrad zu verbinden. Mit dem erfindungsgemäßen Verfahren wird sichergestellt, dass dasAccording to a first teaching of the present invention, the above-described object is achieved in that decorative or other marking elements are embossed into the strip in the last cold pass of the cold rolling and the strip thickness is greater in the area of decorative and identification elements than in the other areas of the strip , In contrast to the method known from the prior art, therefore, the band areas, which are not to be embossed by the marking element or the company logo, are reduced more in their thickness than the areas to be embossed, so that they have a greater strip thickness. This makes it possible to include the embossing step in a finish rolling step and to simultaneously combine the method step for embossing the identification elements or logos with an increased degree of deformation. With the method according to the invention it is ensured that the
Einprägen der Dekor- oder Kennzeichnungselemente prozesssicher erfolgt, ohne dass die Einstellung der Arbeitswalzen in der Fertigung größere Schwierigkeiten aufweist.Impressing the decorative or identification elements is process-reliable, without the adjustment of the work rolls in the manufacturing has greater difficulties.
Vorzugsweise weist mindestens eine der beim Kaltwalzen verwendeten Arbeitswalzen Vertiefungen zum Einprägen der Dekor- oder Kennzeichnungselemente in das Band auf, so dass im Walzspalt das Material des gewalzten Bandes in die Vertiefungen fließt und somit zu Bereichen erhöhter Banddicke führt. Die Amplitude des Prägeprofils im Band beträgt aufgrund der Vertiefungen in der Arbeitswalze maximal 4 μm. Die Vertiefungen der Arbeitswalze sind vorzugsweise lasertexturiert . Es können aber auch andere Verfahren zur Erzeugung der Vertiefungen in der Walze eingesetzt werden. Ferner ist auch denkbar, dass beide Arbeitswalzen entsprechende Vertiefungen aufweisen, entscheidend ist alleine, dass die Bandbereiche, welche keine Dekor- oder Kennzeichnungselemente aufweisen, stärker in ihrer Dicke reduziert werden, als die übrigen, die Dekor- oder Kennzeichnungselemente aufweisenden Bereiche. Eine besonders kostengünstige Ausführungsform des erfindungsgemäßen Verfahrens kann dadurch bereitgestellt werden, dass das Einprägen der Dekor- oderPreferably, at least one of the work rolls used in cold rolling has depressions for impressing the decorative or identification elements into the strip, so that in the roll gap the material of the rolled strip flows into the depressions and thus leads to areas of increased strip thickness. The amplitude of the embossing profile in the belt is due to the wells in the work roll a maximum of 4 microns. The depressions of the work roll are preferably laser texturized. However, other methods for producing the depressions in the roller can also be used. Furthermore, it is also conceivable that both work rolls have corresponding depressions, it is crucial that the band areas, which have no decorative or marking elements, are more strongly reduced in thickness than the other, the decorative or labeling elements having areas. A particularly cost-effective embodiment of the method according to the invention can be provided by stamping on the decorative or
Kennzeichnungselemente inline mit der Herstellung des Bandes beispielsweise für Verpackungszwecke erfolgt. Inline bedeutet in diesem Fall, dass eine Fertigungsstraße für die Herstellung von ungeprägten Bändern verwendet wird und mindestens eine Arbeitswalze des letzten Kaltwalzstichs durch eine Dekor- oder Kennzeichnungselemente als Vertiefungen aufweisende Arbeitswalze ausgetauscht wird und diese Arbeitswalze die Dekor- oder Kennzeichnungselemente in das Band für Verpackungszwecke einprägt.Labeling elements inline with the production of the tape, for example, for packaging purposes. Inline in this case means that a production line is used for the production of unembossed tapes, and at least one work roll of the last cold roll pass is replaced by a work roll having decorative or marking elements and this work roll impresses the decorating or marking elements into the strip for packaging purposes ,
Gemäß einer nächsten Ausführungsform des erfindungsgemäßen Verfahrens wird das Band anschließend an das Fertigwalzen auf ein Coil aufgehaspelt, so dass ein Dekor- oder Kennzeichnungselemente aufweisendes Band den weiteren Arbeitsschritten, beispielsweise Arbeitsschritten zur Herstellung eines Dosendeckels oder eines Dosenverschlusses, zugeführt werden kann.According to a next embodiment of the method according to the invention, the strip is then wound on a coil on the finish rolling, so that a decorative or marking elements exhibiting tape the further steps, such as steps for producing a can lid or a can closure, can be supplied.
Ein besonders prozesssicheres Einbringen der Dekor- oder Kennzeichnungselemente in das Band kann dadurch erreicht werden, dass die Stichabnahme während des prägenden Walzstichs zwischen 20% und 40% beträgt. Es hat sich herausgestellt, dass selbst bei diesen Stichabnahmen ein Prägen des Bandes möglich ist und zu besonders guten und sauberen Prägeergebnissen führt .A particularly reliable insertion of the decorative or marking elements in the band can be achieved in that the stitch loss during the formative roll pass between 20% and 40%. It has been found that embossing of the strip is possible even with these stitches and leads to particularly good and clean embossing results.
Gemäß einer weiteren Ausgestaltung des erfindungsgemäßenAccording to a further embodiment of the invention
Verfahrens weisen die Arbeitswalzen des prägenden Walzenpaars unterschiedliche SchliffStrukturen auf. Dies ist insbesondere vorteilhaft, wenn nur in einer Arbeitswalze Vertiefungen zum Einprägen der Dekor- oder Kennzeichnungselemente vorgesehen sind.Method, the work rolls of the coining roller pair on different grinding structures. This is special advantageous if recesses are provided for impressing the decorative or labeling elements only in a work roll.
Sehr gute Prägeergebnisse wurden gemäß einer weiterenVery good embossing results were according to another
Ausgestaltung des erfindungsgemäßen Verfahrens insbesondere dadurch erreicht, dass der letzte, prägende Walzstich in einem Sexto-Walzgerüst erfolgt.Embodiment of the method according to the invention achieved in particular by the last, formative roll pass in a six-high rolling mill.
Vorzugsweise beträgt die Bandenddicke 0,15 mm bis 0,5 mm, vorzugsweise 0,2 bis 0,35 mm. Diese Bandenddicke wird besonders bevorzugt für die Herstellung von Verpackungen, beispielsweise Dosen, Dosendeckel oder Dosenverschlüsse verwendet. Allerdings kann das Band auch für andere Zwecke oder auch für andere Verpackungen verwendet werden.Preferably, the band end thickness is 0.15 mm to 0.5 mm, preferably 0.2 to 0.35 mm. This final strip thickness is particularly preferably used for the production of packaging, for example, cans, can lids or can closures. However, the tape can also be used for other purposes or for other packaging.
Besonders bevorzugt besteht das Band aus einer 5xxx Aluminiumlegierung, welche neben einem besonders guten Umformverhalten auch sehr hohe Festigkeitswerte erzielt. Es ist aber auch denkbar aus anderen Aluminiumlegierungen mit dem erfindungsgemäßen Verfahren Bänder herzustellen, beispielsweise aus Aluminiumlegierungen vom Typ lxxx, 3xxx oder auch 8xxx.Particularly preferably, the band consists of a 5xxx aluminum alloy, which also achieves very high strength values in addition to a particularly good forming behavior. However, it is also conceivable to produce strips from other aluminum alloys by the method according to the invention, for example from aluminum alloys of the type lxxx, 3xxx or even 8xxx.
Gemäß einer zweiten Lehre der vorliegenden Erfindung wird die oben aufgezeigte Aufgabe durch ein nach dem erfindungsgemäßen Verfahren hergestelltes Band gelöst, wobei das Band eingeprägte Dekor- und Kennzeichnungselemente umfasst und die Banddicke im Bereich der Dekor- oder Kennzeichnungselemente größer ist als in den übrigen Bereichen des Bandes. Das erfindungsgetnäße Band ist individualisiert durch die eingeprägten Dekor- oder Kennzeichnungselemente, ohne dass zusätzliche Kosten, beispielsweise aufgrund eines weiteren Arbeitsschrittes, entstehen.According to a second teaching of the present invention, the object indicated above is achieved by a strip produced by the method according to the invention, wherein the strip comprises embossed decorative and identification elements and the strip thickness is greater in the region of the decorative or marking elements than in the remaining areas of the strip , The tape according to the invention is individualized by the embossed decorative or marking elements without additional costs, for example due to a further working step.
Es gibt nun eine Vielzahl von Möglichkeiten, das erfindungsgetnäße Verfahren sowie das erfindungsgetnäße Band weiterzubilden und auszugestalten. Hierzu wird einerseits verwiesen auf die dem Patentanspruch 1 nachgeordneten Patentansprüche sowie auf die Beschreibung einesThere are now a large number of possibilities for further developing and designing the method according to the invention as well as the tape according to the invention. For this purpose, on the one hand, reference is made to the claims subordinate to claim 1 and to the description of a
Ausführungsbeispiels in Verbindung mit der Zeichnung. Die Zeichnung zeigt inEmbodiment in conjunction with the drawing. The drawing shows in
Fig. 1 eine schematische Ansicht einer Fertigwalzstraße zur Durchführung des erfindungsgemäßen Verfahrens zurFig. 1 is a schematic view of a finishing train for carrying out the method according to the invention for
Herstellung eines Aluminiumbandes für Verpackungszwecke ,Production of an aluminum strip for packaging,
Fig. 2 ein Arbeitswalzenpaar des Fertigwalzgerüsts aus Fig. 1 undFig. 2 is a pair of work rolls of the finishing stand of Fig. 1 and
Fig. 3 in einer schematischen Schnittansicht einFig. 3 in a schematic sectional view a
Ausführungsbeispiel eines erfindungsgemäßen Bandes für Verpackungszwecke.Embodiment of a tape according to the invention for packaging purposes.
Fig. 1 zeigt ein Ausführungsbeispiel einer Fertigwalzstraße 1 zum Kaltwalzen eines Aluminiumbandes 2, welches beispielsweise durch Warmwalzen eines Barren hergestellt worden ist. Das Aluminiumband 2 wird von einer Abwickelhaspel 3 abgewickelt und weiteren Verarbeitungsschritten 4 zugeführt. Die weiterenFig. 1 shows an embodiment of a finishing train 1 for cold rolling an aluminum strip 2, which has been produced for example by hot rolling a billet. The aluminum strip 2 is unwound from an unwinding reel 3 and fed to further processing steps 4. The others
Arbeitsschritte können beispielsweise aus einem Kaltwalzen und einem bandförmigen Zwischenglühen bestehen. Sie sind jedoch nicht notwendig für die Durchführung der vorliegenden Erfindung. Die Arbeitsschritte 4 können daher auch weggelassen werden, sofern beispielsweise das Band batchweise zwischengeglüht, d.h. auf einem Coil aufgewickelt zwischengeglüht, ist und anschließend dem letzten Walzstich zugeführt wird.Work steps can consist for example of a cold rolling and a strip-shaped intermediate annealing. They are, however not necessary for the practice of the present invention. The steps 4 can therefore also be omitted, if, for example, the strip is batchwise annealed, ie, wound up on a coil, and then fed to the last pass.
Im letzten Walzstich in einem Sexto-Walzgerüst 5 wird das Band auf Enddicke gewalzt, wobei vorzugsweise die Stichabnahme zwischen 20 bis 40% beträgt. Im vorliegendenIn the last rolling pass in a six-high rolling stand 5, the strip is rolled to its final thickness, preferably with a reduction of between 20 and 40%. In the present
Ausführungsbeispiel weist die Arbeitswalze 5a Vertiefungen zum Einprägen von Dekor- oder anderen Kennzeichnungselementen auf, welche beim Fertigwalzstich zum Einbringen von Bereichen mit erhöhter Banddicke, nämlich den Bereichen der Dekor- oder Kennzeichnungselemente, führt. Selbstverständlich ist auch denkbar anstelle des Sexto-Walzgerüsts auch andere Walzgerüste verwendet werden. Bisher wurden gute Prägeergebnisse allerdings nur auf einem Sexto-Walzgerüst nachgewiesen.Embodiment, the work roll 5a recesses for embossing decorative or other labeling elements, which leads in the finish rolling pass for the introduction of areas with increased strip thickness, namely the areas of the decorative or marking elements. Of course, also conceivable instead of the six-high rolling mill other rolling mills are used. So far, however, good embossing results have only been proven on a six-high rolling stand.
Das so auf Enddicke gewalzte Aluminiumband wird anschließend auf eine Aufwickelhaspel 6 aufgewickelt. Vor dem Aufwickeln können jedoch noch weitere Arbeitsschritte, beispielsweise eine Oberflächenbehandlung, durchgeführt werden. Die Enddicke des Aluminiumbandes in dem vorliegenden Ausführungsbeispiel beträgt 0,2 bis 0,35 mm. Durch die verwendeteThe aluminum strip thus rolled to final thickness is then wound onto a take-up reel 6. Before winding, however, further work steps, for example a surface treatment, can be carried out. The final thickness of the aluminum strip in the present embodiment is 0.2 to 0.35 mm. Through the used
Aluminiumlegierung, vorzugsweise eine Aluminiumlegierung vom Typ 5xxx wird selbst bei den geringen Wanddicken eine besonders hohe Festigkeit und gleichzeitig eine gute Umformbarkeit des Aluminiumbandes bei der Weiterverarbeitung ermöglicht. Durch die Individualisierung des Aluminiumbandes mit dem erfindungsgemäßen Verfahren besteht die Möglichkeit für den Weiterverarbeiter, die daraus hergestellten Produkte zu kennzeichnen, ohne auf andere Technologien, beispielsweise das zusätzliche Bedrucken oder ähnliches ausweichen zu müssen. Alle zusätzlichen Arbeitsschritte erhöhen die bei diesen Produkten besonders wichtigen Herstellkosten.Aluminum alloy, preferably an aluminum alloy of type 5xxx, enables a particularly high strength and at the same time a good formability of the aluminum strip during further processing, even with the small wall thicknesses. The individualization of the aluminum strip with the method according to the invention makes it possible for the downstream processor to label the products produced therefrom without having to resort to other technologies, for example the additional printing or the like. All additional work steps increase the manufacturing costs which are particularly important for these products.
In Fig. 2 ist das in Fig. 1 dargestellte Sexto-Walzgerüst verwendete Arbeitswalzenpaar 5a, 5b schematisch in perspektivischer Ansicht dargestellt. Während die Arbeitswalze 5a Vertiefungen 7 aufweist, welche zum Einprägen der Dekoroder Kennzeichnungselemente in das Aluminiumband dienen, sind auf der Arbeitswalze 5b keine Vertiefungen vorgesehen. Das so hergestellte Band, weist daher Dekor- oder2, the pair of work rolls 5 a, 5 b used in FIG. 1 is shown schematically in a perspective view. While the work roll 5a has recesses 7 which serve to impress the decorative or marking elements in the aluminum strip, no depressions are provided on the work roll 5b. The tape thus produced, therefore, has decorative or
Kennzeichnungselemente auf, welche in einer Richtung aus der Bandebene heraus eine größere Banddicke als die übrigen Bandbereiche aufweisen. Beide Arbeitswalzen 5a, 5b weisen zur Optimierung des Materialflusses in die Vertiefungen während des Fertigwalzens des Bandes unterschiedliche SchliffStrukturen auf, so dass das Fließen des Aluminiumwerkstoffes in die Vertiefungen der Arbeitswalze 5a im Walzspalt während des Fertigwalzens unterstützt wird. Es ist aber auch möglich, dass beide Arbeitswalzen 5a und 5b Vertiefungen zum Einprägen von Dekor- oder Kennzeichnungselementen aufweisen .Identification elements which have in one direction out of the band plane a greater band thickness than the remaining band areas. Both work rolls 5a, 5b have different cut structures to optimize flow of material into the recesses during finish rolling of the strip, so that flow of the aluminum material into the recesses of the work roll 5a in the roll gap during finish rolling is assisted. But it is also possible that both work rolls have 5a and 5b recesses for impressing decorative or identification elements.
Im Ergebnis wird am Ende des Fertigwalzens ein Aluminiumband 2 für Verpackungszwecke auf ein Coil aufgewickelt, welches im Bereich der Dekorelemente 8 nicht so stark dickenreduziert wurde und insofern eine größere Banddicke aufweist als in den übrigen, nicht mit Dekor- oder Kennzeichnungselementen versehenen Bereichen 9 des Bandes. Hieraus ergibt sich ein maximales Prägeprofil von 4 μm. As a result, at the end of the finish rolling, an aluminum strip 2 is wound onto a coil for packaging purposes, which has not been so much reduced in thickness in the area of the decorative elements 8 and thus has a greater strip thickness than in the others, not with decorative or identification elements provided areas 9 of the tape. This results in a maximum embossing profile of 4 μm.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Bandes aus Aluminium oder einer Aluminiumlegierung für Verpackungszwecke, d a d u r c h g e k e n n z e i c h n e t, d a s s in das Band während des letzten Walzstichs des1. Method for making a strip of aluminum or an aluminum alloy for packaging purposes, but inserting it into the strip during the last pass of the strip
Kaltwalzens Dekor- oder andere Kennzeichnungselemente eingeprägt werden, die Banddicke im Bereich der Dekoroder Kennzeichnungselemente größer ist als in den übrigen Bereichen des Bandes und die Amplitude des Prägeprofils im Band maximal 4 μm beträgt.Kaltwalzens decorative or other labeling elements are embossed, the tape thickness is greater in the field of decor or label elements than in the other areas of the tape and the amplitude of the embossing profile in the band is a maximum of 4 microns.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, d a s s mindestens eine der beim Kaltwalzen verwendeten Arbeitswalzen Vertiefungen zum Einprägen der Dekor- oder Kennzeichnungselemente in das Band aufweist.2. The method of claim 1, wherein at least one of the work rolls used in the cold rolling has indentations for impressing the decorative or identification elements into the strip.
3. Verfahren nach Anspruch 1 oder 2 , d a d u r c h g e k e n n z e i c h n e t, d a s s das Einprägen der Dekor- oder Kennzeichnungselemente inline mit der Herstellung des Bandes für Verpackungs zwecke erfolgt.3. The method according to claim 1 or 2, wherein a stamping of the decorative or marking elements takes place inline with the production of the strip for packaging purposes.
4. Verfahren nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t, d a s s das Band anschließend an das Fertigwalzen auf ein Coil aufgehaspelt wird.4. Method according to one of claims 1 to 3, characterized in that the strip is wound onto a coil following the finish rolling.
5. Verfahren nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, d a s s die Stichabnahme während des prägenden Walzstichs zwischen 20% und 40 % beträgt.5. The method according to any one of claims 1 to 4, characterized in that the pass rate during the formative roll pass is between 20% and 40%.
6. Verfahren nach einem der Ansprüche 1 bis 5, d a d u r c h g e k e n n z e i c h n e t, d a s s die Arbeitswalzen des prägenden Walzenpaars unterschiedliche SchuffStrukturen aufweisen.6. The method according to claim 1, wherein the work rolls of the embossing roll pair have different Schuff structures.
7. Verfahren nach einem der Ansprüche 1 bis 6, d a d u r c h g e k e n n z e i c h n e t, d a s s der letzte, prägende Walzstich in einem Sexto-Walzgerüst erfolgt .7. A process according to any one of claims 1 to 6, wherein a final, stamping roll pass is effected in a six-high rolling mill.
8. Verfahren nach einem der Ansprüche 1 bis 7, d a d u r c h g e k e n n z e i c h n e t, d a s s die Bandendicke 0,15 mm bis 0,5 mm, vorzugsweise 0,2 mm bis 0,35 mm beträgt.8. A method according to any one of claims 1 to 7, wherein the strip thickness is 0.15 mm to 0.5 mm, preferably 0.2 mm to 0.35 mm.
9. Verfahren nach einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t, d a s s das Band aus einer 5xxx Aluminiumlegierung besteht.9. The method of claim 1, wherein the tape is made of a 5xxx aluminum alloy.
10. Band aus Aluminium oder einer Aluminiumlegierung, insbesondere für Verpackungszwecke hergestellt nach einem Verfahren gemäß der Ansprüche 1 bis 9, d a d u r c h g e k e n n z e i c h n e t, d a s s das Band (2) eingeprägte Dekor- oder10. A strip of aluminum or an aluminum alloy, in particular for packaging purposes, produced by a process according to any of claims 1 to 9, wherein the decorative or embossed strip (2) is embossed
Kennzeichnungselemente umfasst, die Banddicke des Bandes im Bereich der Dekor- oder Kennzeichnungselemente (8) größer ist als in den übrigen Bereichen (9) des Bandes und die Amplitude des Prägeprofils im Band maximal 4 μm beträgt . Identification elements comprises, the band thickness of the band in the region of the decorative or marking elements (8) is greater than in the other areas (9) of the band and the amplitude of the embossing profile in the band is 4 microns maximum.
EP09732078A 2008-04-18 2009-04-17 Method for producing an aluminum strip for use in packaging and aluminum strip produced by said method Revoked EP2303489B1 (en)

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DE102008019768A DE102008019768A1 (en) 2008-04-18 2008-04-18 Method of making a tape for packaging
PCT/EP2009/054613 WO2009127730A1 (en) 2008-04-18 2009-04-17 Method for producing an aluminum strip for use in packaging and aluminum strip produced by said method

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RU2483826C2 (en) 2013-06-10
JP2011520611A (en) 2011-07-21
ZA201007765B (en) 2011-07-27
AU2009237610B2 (en) 2013-09-12
ES2392070T3 (en) 2012-12-04
DE102008019768A1 (en) 2009-10-22
JP2014128833A (en) 2014-07-10
CA2721965A1 (en) 2009-10-22
CN102036768A (en) 2011-04-27
RU2010146996A (en) 2012-05-27
EP2303489B1 (en) 2012-06-06
CA2721965C (en) 2014-07-08
US10105748B2 (en) 2018-10-23
US20110183154A1 (en) 2011-07-28
WO2009127730A1 (en) 2009-10-22
CN102036768B (en) 2017-03-01

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