EP1837091A1 - Functional direct coating of aluminium foil - Google Patents

Functional direct coating of aluminium foil Download PDF

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Publication number
EP1837091A1
EP1837091A1 EP07103889A EP07103889A EP1837091A1 EP 1837091 A1 EP1837091 A1 EP 1837091A1 EP 07103889 A EP07103889 A EP 07103889A EP 07103889 A EP07103889 A EP 07103889A EP 1837091 A1 EP1837091 A1 EP 1837091A1
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EP
European Patent Office
Prior art keywords
aluminum foil
aluminum
coating
functional coating
coiling
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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
EP07103889A
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German (de)
French (fr)
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EP1837091B1 (en
Inventor
Günter Schubert
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Hydro Aluminium Deutschland GmbH
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Hydro Aluminium Deutschland GmbH
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Publication of EP1837091A1 publication Critical patent/EP1837091A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
    • 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
    • B21B1/40—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 foils which present special problems, e.g. because of thinness
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0021—Cutting or shearing the product in the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B21B45/0284—Cleaning devices removing liquids removing lubricants
    • 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
    • Y10T428/12431—Foil or filament smaller than 6 mils
    • Y10T428/12438—Composite

Definitions

  • the invention relates to a method for producing a coated aluminum foil, in which the aluminum foil is produced from a hot strip or casting strip of aluminum or an aluminum alloy by cold rolling with or without intermediate annealing and is wound on a coil, wherein prior to coiling optionally an annealing of the aluminum foil , an aluminum foil of aluminum or an aluminum alloy having a functional coating, and an advantageous use of the aluminum foil.
  • the production of aluminum foils by first cast a billet of aluminum or aluminum alloy, the ingot is hot rolled into a hot strip and then the hot strip is cold rolled by cold rolling with or without intermediate annealing to final thickness of the aluminum foil or from a casting belt by cold rolling with any heat treatment.
  • the rolling ingot can be subjected to a heat treatment or a homogenization according to choice before hot rolling.
  • the aluminum foil is preferably double-cold rolled and doubled again before winding onto a coil. After cold rolling or doubling the aluminum foil is usually trimmed, cut to size and wound into a coil. During further processing, the aluminum foil produced in this way is then unwound again and pretreated subjected.
  • the pretreatment consists for example of a baking finish, a primer or a conversion treatment of the aluminum foil.
  • a barrier and / or adhesive layer is formed by chemical reaction on the surface, which is crystalline or amorphous, which protects, for example against corrosion and / or allows better paint adhesion.
  • the so-called "refiner film” for example, in the production of sterilizable packaging materials, are usually greater than in the pretreatment of aluminum foils, the aluminum foil is rewound after pretreatment to form a coil and the coil then the further processing fed. Even greater are the differences in processing speed when using self-assembling molecules than functional coating of the aluminum foil, since the self-assembly of the molecules is only incomplete at high tape speeds.
  • the object of the present invention is to provide a process for the production of a coated aluminum foil with which the production costs for products, in particular sterilizable composite or packaging materials, consisting of a coated aluminum foil can be reduced.
  • the invention has for its object to propose a corresponding aluminum foil or an advantageous use of aluminum foil.
  • the above object is for a generic Method achieved in that prior to the coiling, in particular before the optional annealing of the aluminum foil, a one- or two-sided coating of the aluminum foil is carried out with a functional coating.
  • the one or two-sided coating of the aluminum foil with a functional coating still takes place during the production of the aluminum foil, the unwinding and reeling operations of the aluminum foil required for further processing for applying functional coatings can be avoided and the production costs for products with coated aluminum foils can be reduced .
  • the one- or two-sided functional coating of the aluminum foil can be adapted to the further processing of the aluminum foil, for example to a sterilizable composite or packaging means, and to ensure a wide variety of functions.
  • Coated aluminum foils with a particularly small thickness can be provided in a simple manner, according to a next further developed embodiment of the method according to the invention, that the aluminum foil is doubled during cold rolling and the application of the functional coating takes place during or after the doubling of the aluminum foils.
  • the functional coating of the aluminum foil being applied during trimming or cutting of the aluminum foil, existing systems for arranging means for coating the aluminum foil can be used and investment costs be saved. All you need is an applicator for the functional coating.
  • a particularly simple way of coating the aluminum foil on one or two sides is achieved by applying the functional coating using a solvent, in particular a rolling oil, and at least one heat treatment of the aluminum foil prior to the reeling of the aluminum foil
  • a solvent in particular a rolling oil
  • the use of rolling oil is particularly advantageous because the rolling oil is already used in cold rolling. This then leads to a problem-free wetting of the surface of the aluminum foil when applying the functional coating and thus to a uniform coating.
  • the solvents used should preferably be compatible with rolling oil, so that the highest possible wetting ratio is achieved.
  • the functional coating takes place after the annealing of the aluminum foil, wherein the aluminum foil generally has hardly any rolling oil residues after the annealing. In this case, therefore, almost any solvent is usable.
  • the functional coating of the aluminum foil is applied using a spray or roller applicator.
  • the spray applicator allows a flexible adaptation of the coating widths to the corresponding width of the aluminum foil by arranging several nozzles on a spray bar.
  • the roll applicator is the Coating of the aluminum foil by rolling, wherein the application amount depends on the selected engraving, screening, roughness and the relative speed of the roller to the film.
  • the order quantities for the functional coating can be controlled very accurately.
  • the inventive method is particularly advantageous if the aluminum foil has a thickness of 2 to 100 ⁇ m, since aluminum foils of this thickness are usually used coated for the production of packaging materials.
  • a functional coating with adhesion promoter, release, corrosion protection and / or wetting imparting properties is applied.
  • These typical properties of functional coatings are often needed in the production of packaging materials, for example, to protect the aluminum foil from corrosion due to influences of the contents.
  • the adhesion-promoting property ensures, for example, that plastic films, adhesives, lacquers or printing inks to be laminated onto the aluminum foil adhere particularly well to the aluminum foil surface.
  • Coatings with wetting-imparting properties are preferably used if, when applying a liquid to the aluminum foil, for example a liquid lacquer, the wetting properties of the aluminum foil have to be improved in order, for example, to achieve almost complete wetting and adhesion. Release properties, however, prevent wetting or contamination of the film.
  • other functional coatings are conceivable.
  • the functional property of the coating in particular the adhesion-promoting property and / or the wetting-imparting property, can be subsequently activated, for example by a flame, plasma or corona treatment. It can thus be ensured that the corresponding properties of the aluminum foil only come into play when they are needed in the production process, for example the adhesion-imparting properties shortly before the application of another material to the aluminum foil surface.
  • a grafting layer in particular of self-organizing molecules, preferably of phosphonic acids, carboxylic acids or their compounds or silanes .
  • the head groups of the adsorbent molecule interact with the substrate, ie in the present case with the layers of the aluminum foil close to the surface. Due to this interaction, the head molecules are pushed closer to each other on the surface, so that now the middle parts of the molecules used can interact. These additionally cause a dense packing of the graft layer on the aluminum surface due to van der Waals forces.
  • this dense packing of the molecules deposited on the surface of the aluminum foil can prevent dissolution of the aluminum oxide layer formed on the surface of the aluminum foil, since other compounds be kept away from the aluminum surface or displaced, so that a good corrosion protection is achieved.
  • the forming covalent, ionic-covalent or polar bonds to the aluminum oxide surface of the aluminum foil can be used in a simple manner to form an activatable adhesion promoter.
  • reactive groups are formed on the ends of the molecules of the graft layer, which point away from the surface of the aluminum foil, for example by corona treatment, which forms particularly strong compounds, for example with a plastic melt.
  • Phosphonic acids, sulfonic acids and carboxylic acids are generally used to form a corrosion protection.
  • Silanes are typically used to form a primer layer.
  • a wetting agent can be provided by diglyceride phosphonates, corrosion protection by alkylene diphosphonates and an adhesion promoter by the functional coating through alkoxysilanes.
  • the above object is achieved by an aluminum foil of aluminum or an aluminum alloy having a functional coating which has been produced by the method according to the invention.
  • the aluminum foil produced according to the invention can be used without additional processing, surface treatment and winding Further processing, for example, be used for the production of a packaging means, so that the manufacturing cost of the packaging means can be reduced.
  • the aluminum foil according to a third teaching of the present invention for the production of composite materials, in particular sterilizable composite materials or sterilizable packaging materials.
  • the functional coating even when using elevated temperatures, such as occur during sterilization, the maintenance of sufficient adhesion between the aluminum foil and the material intended for contact with the product.
  • by coating the aluminum foil with a functional coating immediately after or during the production of the aluminum foil additional process steps in the area of further processing are saved.
  • particularly low production costs for composite materials for example sterilizable composite materials or sterilizable packaging materials, can be achieved when using an aluminum foil produced according to the invention.
  • the single FIGURE shows a schematic view of the processing steps in the production of an aluminum foil according to the invention 1. Not shown in the figure that the doubled aluminum foil 4 previously from a hot strip, which was hot rolled from an ingot of an aluminum alloy, by cold rolling with or without Intermediate annealing was prepared and doubled on the coil 2 was wound up.
  • the doubled aluminum foil 4 is first unwound from a coil 2, cold-rolled using a cold rolling stand 3 and then doubled.
  • the doubled aluminum foil 4 passes through the cold rolling stand 3 and is thereby cold-rolled to a minimum final dimension, for example 2 to 7 ⁇ m.
  • the doubled aluminum foil 4 is doubled at the guide rollers 5 and divided into two simple aluminum foils 1.
  • the functional coating is carried out by the spray application unit 6, which is carried out in the illustrated embodiment of the method according to the invention immediately after the doubling.
  • rolling oil is preferably used as the solvent, which is present on the aluminum strip during cold rolling and thus enables good wettability of the surface of the aluminum foil 1. It is conceivable to use the rolling oil as solvent for the functional coating directly when rolling the film.
  • the molecules applied to the aluminum surface with the solvent form a graft layer which covers the surface of the Cover aluminum foil, at least later in the course completely. Complete wetting of the aluminum foil 1 is not required. Especially with self-organizing molecules, self-assembly forms a dense packing on the aluminum foil surface. After spraying the functional coating on the surface of the aluminum foil 1 further, not shown in the drawing treatment steps, for example, a trimming and cutting made to measure.
  • the aluminum foil is subjected to a heat treatment in heat treatment stations 7, with which in particular the rolling oil is removed from the surface of the aluminum foil 1.
  • An annealing of the aluminum foil does not necessarily have to take place at this point, so that even hard-rolled, coated aluminum foils 1 can be produced.
  • the heat treatment at the heat treatment stations 7 can also be used to accelerate grafting of the molecules applied to the aluminum surface.
  • the surface of the aluminum foil 1 can respond to the different requirements in the further processing for the production of, for example, composite materials or packaging materials immediately after the production of the aluminum foil 1 be prepared. Additional unwinding, coating and / or winding processes for pretreatment of the aluminum foil for further processing are no longer necessary in this respect.
  • the aluminum foil can also be cold rolled to final thickness and coated according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Metal Rolling (AREA)
  • Wrappers (AREA)

Abstract

The method involves manufacturing an aluminum foil (1) from a hot-rolled strip or a casting strip of aluminum or aluminum alloy by cold-rolling with or without intermediate annealing, and optional annealing of the aluminum foil before reeling the aluminum foil on a coil (2). Single or double sided coating of the aluminum foil is carried out by a functional coating before the optional annealing of the aluminum foil, where the functional coating forms a grafting layer, preferably from phosphonic acid. An independent claim is also included for an aluminum foil of aluminum or aluminum alloy manufactured by a functional coating.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer beschichteten Aluminiumfolie, bei welchem die Aluminiumfolie aus einem Warmband oder Gießband aus Aluminium oder einer Aluminiumlegierung durch Kaltwalzen mit oder ohne Zwischenglühung hergestellt wird und auf ein Coil aufgehaspelt wird, wobei vor dem Aufhaspeln optional eine Glühung der Aluminiumfolie erfolgt, eine Aluminiumfolie aus Aluminium oder einer Aluminiumlegierung mit einer funktionalen Beschichtung sowie eine vorteilhafte Verwendung der Aluminiumfolie.The invention relates to a method for producing a coated aluminum foil, in which the aluminum foil is produced from a hot strip or casting strip of aluminum or an aluminum alloy by cold rolling with or without intermediate annealing and is wound on a coil, wherein prior to coiling optionally an annealing of the aluminum foil , an aluminum foil of aluminum or an aluminum alloy having a functional coating, and an advantageous use of the aluminum foil.

Bisher erfolgt die Herstellung von Aluminiumfolien indem zunächst ein Walzbarren aus Aluminium oder einer Aluminiumlegierung gegossen, der Walzbarren zu einem Warmband warmgewalzt und anschließend das Warmband durch Kaltwalzen mit oder ohne Zwischenglühungen auf Enddicke der Aluminiumfolie kaltgewalzt wird oder aus einem Gießband durch Kaltwalzen mit eventueller Wärmebehandlung. Der Walzbarren kann dabei nach Wahl vor dem Warmwalzen einer Wärmebehandlung bzw. einem Homogenisieren unterzogen werden. Um möglichst geringe Dicken der Aluminiumfolie zu erreichen, wird die Aluminiumfolie vorzugsweise gedoppelt kaltgewalzt und vor dem Aufwickeln auf ein Coil wieder entdoppelt. Nach dem Kaltwalzen bzw. dem Entdoppeln wird die Aluminiumfolie in der Regel besäumt, auf Maß geschnitten und zu einem Coil aufgehaspelt. Bei der Weiterverarbeitung wird die so hergestellte Aluminiumfolie dann erneut abgewickelt und einer Vorbehandlung unterzogen. Die Vorbehandlung besteht beispielsweise aus einem Einbrennlackieren, einem Primern oder einer Konversionsbehandlung der Aluminiumfolie. Bei der Konversionsbehandlung wird durch chemische Reaktion oberflächlich eine Barriere- und/oder Haftschicht gebildet, die kristallin oder amorph ist, welche beispielsweise vor Korrosion schützt und/oder eine bessere Lackhaftung ermöglicht. Da die Geschwindigkeiten bei der Weiterverarbeitung der Aluminiumfolie, der sogenannten "Veredlerfolie", beispielsweise bei der Herstellung von sterilisierbaren Verpackungsmitteln, zumeist größer sind als bei der Vorbehandlung der Aluminiumfolien, wird die Aluminiumfolie nach der Vorbehandlung erneut zu einem Coil aufgehaspelt und das Coil dann dem Weiterverarbeitungsprozess zugeführt. Noch größer sind die Unterschiede der Verarbeitungsgeschwindigkeit bei der Verwendung von selbstorganisierenden Molekülen als funktionale Beschichtung der Aluminiumfolie, da die Selbstorganisation der Moleküle bei hohen Bandgeschwindigkeiten nur unvollständig ist.So far, the production of aluminum foils by first cast a billet of aluminum or aluminum alloy, the ingot is hot rolled into a hot strip and then the hot strip is cold rolled by cold rolling with or without intermediate annealing to final thickness of the aluminum foil or from a casting belt by cold rolling with any heat treatment. The rolling ingot can be subjected to a heat treatment or a homogenization according to choice before hot rolling. In order to achieve the lowest possible thicknesses of the aluminum foil, the aluminum foil is preferably double-cold rolled and doubled again before winding onto a coil. After cold rolling or doubling the aluminum foil is usually trimmed, cut to size and wound into a coil. During further processing, the aluminum foil produced in this way is then unwound again and pretreated subjected. The pretreatment consists for example of a baking finish, a primer or a conversion treatment of the aluminum foil. In the conversion treatment, a barrier and / or adhesive layer is formed by chemical reaction on the surface, which is crystalline or amorphous, which protects, for example against corrosion and / or allows better paint adhesion. Since the speeds in the further processing of the aluminum foil, the so-called "refiner film", for example, in the production of sterilizable packaging materials, are usually greater than in the pretreatment of aluminum foils, the aluminum foil is rewound after pretreatment to form a coil and the coil then the further processing fed. Even greater are the differences in processing speed when using self-assembling molecules than functional coating of the aluminum foil, since the self-assembly of the molecules is only incomplete at high tape speeds.

Von dem zuvor geschilderten Stand der Technik ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren zur Herstellung einer beschichteten Aluminiumfolie zur Verfügung zustellen, mit welchem die Herstellkosten für Produkte, insbesondere sterilisierbaren Verbund- oder Verpackungsmittel, bestehend aus einer beschichteten Aluminiumfolie gesenkt werden können. Darüber hinaus liegt der Erfindung die Aufgabe zugrunde, eine entsprechende Aluminiumfolie bzw. eine vorteilhafte Verwendung der Aluminiumfolie vorzuschlagen.Based on the above-described prior art, the object of the present invention is to provide a process for the production of a coated aluminum foil with which the production costs for products, in particular sterilizable composite or packaging materials, consisting of a coated aluminum foil can be reduced. In addition, the invention has for its object to propose a corresponding aluminum foil or an advantageous use of aluminum foil.

Gemäß einer ersten Lehre der vorliegenden Erfindung wird die oben genannte Aufgabe für ein gattungsgemäßes Verfahren dadurch gelöst, dass vor dem Aufhaspeln, insbesondere vor der optionalen Glühung der Aluminiumfolie, ein ein- oder zweiseitiges Beschichten der Aluminiumfolie mit einer funktionalen Beschichtung erfolgt.According to a first teaching of the present invention, the above object is for a generic Method achieved in that prior to the coiling, in particular before the optional annealing of the aluminum foil, a one- or two-sided coating of the aluminum foil is carried out with a functional coating.

Da erfindungsgemäß das ein- oder zweiseitige Beschichten der Aluminiumfolie mit einer funktionalen Beschichtung noch während der Herstellung der Aluminiumfolie erfolgt, können die bei der Weiterverarbeitung zur Aufbringung funktionaler Beschichtungen erforderlichen Abwickel- und Aufhaspelvorgänge der Aluminiumfolie vermieden werden und die Herstellkosten für Produkte mit beschichteten Aluminiumfolien verringert werden. Die ein- oder zweiseitige funktionale Beschichtung der Aluminiumfolie kann an die Weiterverarbeitung der Aluminiumfolie, beispielsweise zu einem sterilisierbaren Verbund- oder Verpackungsmittel, angepasst werden und unterschiedlichste Funktionen gewährleisten.Since, in accordance with the invention, the one or two-sided coating of the aluminum foil with a functional coating still takes place during the production of the aluminum foil, the unwinding and reeling operations of the aluminum foil required for further processing for applying functional coatings can be avoided and the production costs for products with coated aluminum foils can be reduced , The one- or two-sided functional coating of the aluminum foil can be adapted to the further processing of the aluminum foil, for example to a sterilizable composite or packaging means, and to ensure a wide variety of functions.

Beschichtete Aluminiumfolien mit einer besonders geringen Dicke können auf einfache Weise, gemäß einer nächsten weitergebildeten Ausführungsform des erfindungsgemäßen Verfahren, dadurch zur Verfügung gestellt werden, dass die Aluminiumfolie beim Kaltwalzen gedoppelt wird und das Auftragen der funktionalen Beschichtung während des oder nach dem Entdoppeln der Aluminiumfolien erfolgt.Coated aluminum foils with a particularly small thickness can be provided in a simple manner, according to a next further developed embodiment of the method according to the invention, that the aluminum foil is doubled during cold rolling and the application of the functional coating takes place during or after the doubling of the aluminum foils.

Wird die Aluminiumfolie vor dem Aufhaspeln besäumt und auf Maß geschnitten, wobei beim Besäumen oder Schneiden der Aluminiumfolie die funktionale Beschichtung der Aluminiumfolie aufgetragen wird, können bestehende Anlagen zur Anordnung von Mitteln zur Beschichtung der Aluminiumfolie verwendet werden und Investitionskosten eingespart werden. Man benötigt lediglich noch eine Auftragsvorrichtung für die funktionale Beschichtung.If the aluminum foil is trimmed before being coiled and cut to size, the functional coating of the aluminum foil being applied during trimming or cutting of the aluminum foil, existing systems for arranging means for coating the aluminum foil can be used and investment costs be saved. All you need is an applicator for the functional coating.

Eine besonders einfache Möglichkeit die Aluminiumfolie ein- oder zweiseitig zu beschichten, wird gemäß einer nächsten weitergebildeten Ausführungsform des erfindungsgemäßen Verfahrens dadurch erzielt, dass die funktionale Beschichtung unter Verwendung eines Lösungsmittels, insbesondere eines Walzöls, aufgetragen wird und vor dem Aufhaspeln der Aluminiumfolie zumindest eine Wärmebehandlung der Aluminiumfolie zur Entfernung des Lösungsmittels, insbesondere des Walzöls, erfolgt. Die Verwendung von Walzöl ist besonders vorteilhaft, da das Walzöl bereits beim Kaltwalzen verwendet wird. Dies führt dann zu einer problemlosen Benetzung der Oberfläche der Aluminiumfolie beim Auftragen der funktionalen Beschichtung und damit zu einer gleichmäßigen Beschichtung. Um Benetzungsprobleme beim Beschichten zu vermeiden, sollten die verwendeten Lösungsmittel vorzugsweise mit Walzöl verträglich sein, so dass ein möglichst hohes Benetzungsverhältnis erzielt wird. Allerdings ist auch vorstellbar, dass die funktionale Beschichtung nach dem Glühen der Aluminiumfolie erfolgt, wobei die Aluminiumfolie nach dem Glühen in der Regel kaum mehr Walzölrückstände aufweist. In diesem Fall ist daher nahezu ein beliebiges Lösungsmittel verwendbar.A particularly simple way of coating the aluminum foil on one or two sides is achieved by applying the functional coating using a solvent, in particular a rolling oil, and at least one heat treatment of the aluminum foil prior to the reeling of the aluminum foil Aluminum foil for the removal of the solvent, in particular of the rolling oil, takes place. The use of rolling oil is particularly advantageous because the rolling oil is already used in cold rolling. This then leads to a problem-free wetting of the surface of the aluminum foil when applying the functional coating and thus to a uniform coating. To avoid wetting problems when coating, the solvents used should preferably be compatible with rolling oil, so that the highest possible wetting ratio is achieved. However, it is also conceivable that the functional coating takes place after the annealing of the aluminum foil, wherein the aluminum foil generally has hardly any rolling oil residues after the annealing. In this case, therefore, almost any solvent is usable.

Vorzugsweise wird die funktionale Beschichtung der Aluminiumfolie unter Verwendung eines Sprüh- oder Walzenauftragswerks aufgetragen. Das Sprühauftragswerk ermöglicht durch die Anordnung mehrerer Düsen auf einem Sprühbalken eine flexible Anpassung der Beschichtungsbreiten auf die entsprechende Breite der Aluminiumfolie. Bei dem Walzenauftragswerk erfolgt die Beschichtung der Aluminiumfolie durch Walzen, wobei die Auftragsmenge abhängig von der gewählten Gravur, Rasterung, Rauheit und der Relativgeschwindigkeit der Walze zur Folie ist. Damit können die Auftragsmengen für die funktionale Beschichtung sehr genau gesteuert werden.Preferably, the functional coating of the aluminum foil is applied using a spray or roller applicator. The spray applicator allows a flexible adaptation of the coating widths to the corresponding width of the aluminum foil by arranging several nozzles on a spray bar. In the roll applicator is the Coating of the aluminum foil by rolling, wherein the application amount depends on the selected engraving, screening, roughness and the relative speed of the roller to the film. Thus, the order quantities for the functional coating can be controlled very accurately.

Besonders vorteilhaft ist das erfindungsgemäße Verfahren dann, wenn die Aluminiumfolie eine Dicke von 2 bis 100 µm aufweist, da Aluminiumfolien mit dieser Dicke für die Herstellung von Verpackungsmitteln üblicherweise beschichtet verwendet werden.The inventive method is particularly advantageous if the aluminum foil has a thickness of 2 to 100 μm, since aluminum foils of this thickness are usually used coated for the production of packaging materials.

Gemäß einer nächsten weitergebildeten Ausführungsform des erfindungsgemäßen Verfahrens wird eine funktionale Beschichtung mit Haftvermittler-, Release-, Korrosionsschutz- und/oder Benetzungsvermittlereigenschaften aufgetragen. Diese typischen Eigenschaften funktionaler Beschichtungen werden häufig bei der Herstellung von Verpackungsmitteln benötigt, beispielsweise um die Aluminiumfolie vor Korrosion durch Einflüsse des Füllgutes zu schützen. Die Haftvermittlungseigenschaft gewährleistet beispielsweise, dass auf die Aluminiumfolie aufzukaschierende Kunststofffolien, Klebstoffe, Lacke oder Druckfarben besonders gut an der Aluminiumfolienoberfläche haften. Beschichtungen mit Benetzungsvermittlereigenschaften werden vorzugsweise verwendet, sofern beim Auftragen einer Flüssigkeit auf die Aluminiumfolie, beispielsweise eines flüssigen Lackes, die Benetzungseigenschaften der Aluminiumfolie verbessert werden müssen, um beispielsweise eine nahezu vollständige Benetzung und Haftung zu erzielen. Releaseeigenschaften verhindern dagegen eine Benetzung bzw. Verschmutzung der Folie. Darüber hinaus sind auch andere funktionale Beschichtungen denkbar.According to a next further developed embodiment of the method according to the invention, a functional coating with adhesion promoter, release, corrosion protection and / or wetting imparting properties is applied. These typical properties of functional coatings are often needed in the production of packaging materials, for example, to protect the aluminum foil from corrosion due to influences of the contents. The adhesion-promoting property ensures, for example, that plastic films, adhesives, lacquers or printing inks to be laminated onto the aluminum foil adhere particularly well to the aluminum foil surface. Coatings with wetting-imparting properties are preferably used if, when applying a liquid to the aluminum foil, for example a liquid lacquer, the wetting properties of the aluminum foil have to be improved in order, for example, to achieve almost complete wetting and adhesion. Release properties, however, prevent wetting or contamination of the film. In addition, other functional coatings are conceivable.

Vorzugsweise ist die funktionale Eigenschaft der Beschichtung, insbesondere die Haftvermittlungseigenschaft und/oder die Benetzungsvermittlungseigenschaft nachträglich aktivierbar, beispielsweise durch eine Flamm-, Plasma- oder Coronabehandlung. Damit kann gewährleistet werden, dass die entsprechenden Eigenschaften der Aluminiumfolie erst dann zum Tragen kommt, wenn diese im Herstellungsprozess benötigt werden, beispielsweise die Haftvermittlungseigenschaften kurz vor dem Aufbringen eines anderen Materials auf die Aluminiumfolienoberfläche.Preferably, the functional property of the coating, in particular the adhesion-promoting property and / or the wetting-imparting property, can be subsequently activated, for example by a flame, plasma or corona treatment. It can thus be ensured that the corresponding properties of the aluminum foil only come into play when they are needed in the production process, for example the adhesion-imparting properties shortly before the application of another material to the aluminum foil surface.

Besonders gute Eigenschaften in Bezug auf den Korrosionsschutz, Haftvermittlung oder Benetzbarkeit kann dadurch erzielt werden, dass gemäß einer nächsten vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens, die funktionale Beschichtung eine Pfropfschicht, insbesondere aus selbstorganisierenden Molekülen, vorzugsweise aus Phosphonsäuren, Carbonsäuren oder deren Verbindungen oder Silanen gebildet wird. Bei einer Pfropfschicht Wechselwirken die Kopfgruppen des adsorbierenden Moleküls mit dem Substrat, d. h. vorliegend mit den oberflächennahen Schichten der Aluminiumfolie. Aufgrund dieser Wechselwirkung werden die Kopfmoleküle an der Oberfläche näher aneinander geschoben, so dass nun die Mittelteile der verwendeten Moleküle in Wechselwirkung treten können. Diese bewirken aufgrund von Van-der-Waals-Kräften zusätzlich eine dichte Packung der Pfropfschicht auf der Aluminiumoberfläche. Beispielsweise kann durch diese dichte Packung der an der Oberfläche der Aluminiumfolie angelagerten Moleküle ein Auflösen der ausgebildeten Aluminiumoxidschicht an der Oberfläche der Aluminiumfolie verhindert werden, da andere Verbindungen von der Aluminiumoberfläche ferngehalten oder verdrängt werden, so dass ein guter Korrosionsschutz erreicht wird. Die sich bildenden kovalenten, ionisch-kovalenten oder polaren Bindungen zur Aluminiumoxidoberfläche der Aluminiumfolie können auf einfache Weise zur Bildung eines aktivierbaren Haftvermittlers verwendet werden. Bei der Aktivierung des Haftvermittlers werden an den von der Oberfläche der Aluminiumfolie wegweisenden Enden der Moleküle der Pfropfschicht, beispielsweise durch eine Coronabehandlung, reaktive Gruppen gebildet, welche beispielsweise mit einer Kunststoffschmelze besonders feste Verbindungen eingehen. Phosphonsäuren, Sulfonsäuren und Carbonsäuren werden in der Regel zur Ausbildung eines Korrosionsschutzes verwendet. Silane werden dagegen typischerweise für die Bildung einer Haftvermittlungsschicht verwendet.Particularly good properties with regard to corrosion protection, adhesion promotion or wettability can be achieved by forming, according to a next advantageous embodiment of the process, the functional coating, a grafting layer, in particular of self-organizing molecules, preferably of phosphonic acids, carboxylic acids or their compounds or silanes , In the case of a graft layer, the head groups of the adsorbent molecule interact with the substrate, ie in the present case with the layers of the aluminum foil close to the surface. Due to this interaction, the head molecules are pushed closer to each other on the surface, so that now the middle parts of the molecules used can interact. These additionally cause a dense packing of the graft layer on the aluminum surface due to van der Waals forces. For example, this dense packing of the molecules deposited on the surface of the aluminum foil can prevent dissolution of the aluminum oxide layer formed on the surface of the aluminum foil, since other compounds be kept away from the aluminum surface or displaced, so that a good corrosion protection is achieved. The forming covalent, ionic-covalent or polar bonds to the aluminum oxide surface of the aluminum foil can be used in a simple manner to form an activatable adhesion promoter. When the adhesion promoter is activated, reactive groups are formed on the ends of the molecules of the graft layer, which point away from the surface of the aluminum foil, for example by corona treatment, which forms particularly strong compounds, for example with a plastic melt. Phosphonic acids, sulfonic acids and carboxylic acids are generally used to form a corrosion protection. Silanes, on the other hand, are typically used to form a primer layer.

Werden substituierte Phosphonsäuren oder deren Derivate, insbesondere Diglycerid-Phosphonate, Alkylendiphosphonate oder Alkoxysilane zur Bildung der Pfropfschicht verwendet, kann durch Diglycerid-Phosphonate ein Benetzungsvermittler, durch Alkylendiphosphonate ein Korrosionsschutz und durch Alkoxysilane ein Haftvermittler durch die funktionale Beschichtung zur Verfügung gestellt werden.If substituted phosphonic acids or their derivatives, especially diglyceride phosphonates, alkylenediphosphonates or alkoxysilanes, are used to form the graft layer, a wetting agent can be provided by diglyceride phosphonates, corrosion protection by alkylene diphosphonates and an adhesion promoter by the functional coating through alkoxysilanes.

Gemäß einer zweiten Lehre der vorliegenden Erfindung wird die oben genannte Aufgabe durch eine Aluminiumfolie aus Aluminium oder einer Aluminiumlegierung mit einer funktionalen Beschichtung gelöst, welche durch das erfindungsgemäße Verfahren hergestellt wurde. Wie bereits oben ausgeführt, kann die erfindungsgemäß hergestellte Aluminiumfolie ohne zusätzliche Abwicklung, Oberflächenbehandlung und Aufwicklung, zur Weiterverarbeitung, beispielsweise zur Herstellung eines Verpackungsmittels verwendet werden, so dass die Herstellkosten des Verpackungsmittels gesenkt werden können.According to a second teaching of the present invention, the above object is achieved by an aluminum foil of aluminum or an aluminum alloy having a functional coating which has been produced by the method according to the invention. As already stated above, the aluminum foil produced according to the invention can be used without additional processing, surface treatment and winding Further processing, for example, be used for the production of a packaging means, so that the manufacturing cost of the packaging means can be reduced.

Vorteilhaft ist daher auch die Verwendung der Aluminiumfolie gemäß einer dritten Lehre der vorliegenden Erfindung zur Herstellung von Verbundmaterialien, insbesondere sterilisierbarer Verbundmaterialien oder sterilisierbarer Verpackungsmittel. Einerseits gewährleistet die funktionale Beschichtung auch bei der Anwendung erhöhter Temperaturen, wie sie beim Sterilisieren auftreten, die Aufrechterhaltung genügender Haftung zwischen der Aluminiumfolie und dem für den Kontakt mit dem Füllgut vorgesehenen Material. Andererseits werden durch das Beschichten der Aluminiumfolie mit einer funktionalen Beschichtung unmittelbar nach bzw. während der Herstellung der Aluminiumfolie zusätzliche Prozessschritte im Bereich der Weiterverarbeitung eingespart. Im Ergebnis können bei erfindungsgemäßer Verwendung einer erfindungsgemäß hergestellten Aluminiumfolie besonders geringe Herstellkosten für Verbundmaterialien, beispielsweise sterilisierbare Verbundmaterialien oder sterilisierbare Verpackungsmittel erzielt werden.Therefore, it is also advantageous to use the aluminum foil according to a third teaching of the present invention for the production of composite materials, in particular sterilizable composite materials or sterilizable packaging materials. On the one hand ensures the functional coating, even when using elevated temperatures, such as occur during sterilization, the maintenance of sufficient adhesion between the aluminum foil and the material intended for contact with the product. On the other hand, by coating the aluminum foil with a functional coating immediately after or during the production of the aluminum foil, additional process steps in the area of further processing are saved. As a result, particularly low production costs for composite materials, for example sterilizable composite materials or sterilizable packaging materials, can be achieved when using an aluminum foil produced according to the invention.

Es gibt nun eine Vielzahl von Möglichkeiten das erfindungsgemäße Verfahren sowie die erfindungsgemäße Aluminiumfolie oder deren Verwendung weiterzugestalten und auszubilden. Hierzu wird einerseits verwiesen auf die dem Patentanspruch 1 nachgeordneten Patentansprüche sowie auf die Beschreibung eines Ausführungsbeispiels des erfindungsgemäßen Verfahrens in Verbindung mit der Zeichnung.There are now a variety of ways to further develop and form the inventive method and the aluminum foil or its use 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 an embodiment of the method according to the invention in conjunction with the drawing.

Die einzige Figur zeigt in einer schematischen Ansicht die Verarbeitungsschritte bei der Herstellung einer erfindungsgemäßen Aluminiumfolie 1. Nicht dargestellt ist in der Figur, dass die gedoppelte Aluminiumfolie 4 zuvor aus einem Warmband, welches aus einem Walzbarren aus einer Aluminiumlegierung warmgewalzt wurde, durch Kaltwalzen mit oder ohne Zwischenglühungen hergestellt und gedoppelt auf das Coil 2 aufgewickelt wurde.The single FIGURE shows a schematic view of the processing steps in the production of an aluminum foil according to the invention 1. Not shown in the figure that the doubled aluminum foil 4 previously from a hot strip, which was hot rolled from an ingot of an aluminum alloy, by cold rolling with or without Intermediate annealing was prepared and doubled on the coil 2 was wound up.

Entsprechend der Figur wird zunächst die gedoppelte Aluminiumfolie 4 von einem Coil 2 abgewickelt, unter Verwendung eines Kaltwalzgerüstes 3 kaltgewalzt und anschließend entdoppelt. Die gedoppelte Aluminiumfolie 4 durchläuft das Kaltwalzgerüst 3 und wird dadurch auf ein minimales Endmaß, beispielsweise 2 bis 7 µm, kaltgewalzt. Nach dem Kaltwalzen der gedoppelten Aluminiumfolie 4 wird an den Führungswalzen 5 die gedoppelte Aluminiumfolie 4 entdoppelt und in zwei einfache Aluminiumfolien 1 aufgeteilt. Nach dem Entdoppeln erfolgt die funktionale Beschichtung durch das Sprühauftragswerk 6, welches im dargestellten Ausführungsbeispiel des erfindungsgemäßen Verfahrens unmittelbar nach dem Entdoppeln durchgeführt wird.According to the figure, the doubled aluminum foil 4 is first unwound from a coil 2, cold-rolled using a cold rolling stand 3 and then doubled. The doubled aluminum foil 4 passes through the cold rolling stand 3 and is thereby cold-rolled to a minimum final dimension, for example 2 to 7 μm. After the cold rolling of the doubled aluminum foil 4, the doubled aluminum foil 4 is doubled at the guide rollers 5 and divided into two simple aluminum foils 1. After uncoupling, the functional coating is carried out by the spray application unit 6, which is carried out in the illustrated embodiment of the method according to the invention immediately after the doubling.

Für die funktionale Beschichtung wird bevorzugt Walzöl als Lösungsmittel verwendet, welches beim Kaltwalzen auf dem Aluminiumband vorhanden ist und insofern eine gute Benetzbarkeit der Oberfläche der Aluminiumfolie 1 ermöglicht. Es ist dabei denkbar unmittelbar beim Walzen der Folie das Walzöl als Lösungsmittel für die funktionale Beschichtung zu verwenden. Vorzugsweise bilden die mit dem Lösungsmittel auf die Aluminiumoberfläche aufgebrachten Moleküle eine Pfropfschicht, welche die Oberfläche der Aluminiumfolie, zumindest im späteren Verlauf vollständig bedecken. Eine vollständige Benetzung der Aluminiumfolie 1 ist dabei nicht erforderlich. Insbesondere bei selbstorganisierenden Molekülen wird durch Selbstorganisation eine dichte Packung auf der Aluminiumfolienoberfläche gebildet. Nach dem Aufsprühen der funktionalen Beschichtung auf die Oberfläche der Aluminiumfolie 1 können weitere, in der Zeichnung nicht dargestellte Behandlungsschritte, beispielsweise ein Besäumen und ein Schneiden auf Maß erfolgen. Anschließend wird die Aluminiumfolie in Wärmebehandlungsstationen 7 einer Wärmebehandlung unterzogen, mit welcher insbesondere das Walzöl von der Oberfläche der Aluminiumfolie 1 beseitigt wird. Eine Glühung der Aluminiumfolie muss an dieser Stelle nicht notwendigerweise erfolgen, so dass auch walzharte, beschichtete Aluminiumfolien 1 hergestellt werden können. Die Wärmebehandlung an den Wärmebehandlungsstationen 7 kann aber auch dazu benutzt werden, ein Aufpfropfen der auf die Aluminiumoberfläche aufgebrachten Moleküle zu beschleunigen bzw. zu vervollständigen. Durch die verschiedenen chemischen Zusammensetzungen, welche über das Sprühauftragswerk 6 auf die Oberfläche der Aluminiumfolie 1 aufgebracht werden können, kann die Oberfläche der Aluminiumfolie 1 auf die unterschiedlichen Anforderungen in der Weiterverarbeitung zur Herstellung, beispielsweise von Verbundmaterialien oder Verpackungsmitteln unmittelbar im Anschluss an die Herstellung der Aluminiumfolie 1 vorbereitet werden. Zusätzliche Abwickel-, Beschichtungs- und/oder Aufwickelprozesse zur Vorbehandlung der Aluminiumfolie für die Weiterverarbeitung sind insofern nicht mehr notwendig. Selbstverständlich kann die Aluminiumfolie auch einfach auf Enddicke kaltgewalzt und erfindungsgemäß beschichtet werden.For the functional coating, rolling oil is preferably used as the solvent, which is present on the aluminum strip during cold rolling and thus enables good wettability of the surface of the aluminum foil 1. It is conceivable to use the rolling oil as solvent for the functional coating directly when rolling the film. Preferably, the molecules applied to the aluminum surface with the solvent form a graft layer which covers the surface of the Cover aluminum foil, at least later in the course completely. Complete wetting of the aluminum foil 1 is not required. Especially with self-organizing molecules, self-assembly forms a dense packing on the aluminum foil surface. After spraying the functional coating on the surface of the aluminum foil 1 further, not shown in the drawing treatment steps, for example, a trimming and cutting made to measure. Subsequently, the aluminum foil is subjected to a heat treatment in heat treatment stations 7, with which in particular the rolling oil is removed from the surface of the aluminum foil 1. An annealing of the aluminum foil does not necessarily have to take place at this point, so that even hard-rolled, coated aluminum foils 1 can be produced. However, the heat treatment at the heat treatment stations 7 can also be used to accelerate grafting of the molecules applied to the aluminum surface. As a result of the various chemical compositions which can be applied to the surface of the aluminum foil 1 via the spray application unit 6, the surface of the aluminum foil 1 can respond to the different requirements in the further processing for the production of, for example, composite materials or packaging materials immediately after the production of the aluminum foil 1 be prepared. Additional unwinding, coating and / or winding processes for pretreatment of the aluminum foil for further processing are no longer necessary in this respect. Of course, the aluminum foil can also be cold rolled to final thickness and coated according to the invention.

Claims (12)

Verfahren zur Herstellung einer beschichteten Aluminiumfolie, bei welchem die Aluminiumfolie aus einem Warmband oder Gießband aus Aluminium oder einer Aluminiumlegierung durch Kaltwalzen mit oder ohne Zwischenglühung hergestellt wird und auf ein Coil aufgehaspelt wird, wobei vor dem Aufhaspeln optional eine Glühung der Aluminiumfolie erfolgt,
dadurch gekennzeichnet, dass vor dem Aufhaspeln, insbesondere vor der optionalen Glühung der Aluminiumfolie ein ein- oder zweiseitiges Beschichten der Aluminiumfolie mit mindestens einer funktionalen Beschichtung erfolgt.A process for producing a coated aluminum foil, in which the aluminum foil is produced from a hot strip or casting strip made of aluminum or an aluminum alloy by cold rolling with or without intermediate annealing and is wound onto a coil, optionally before the coiling of the aluminum foil is annealed,
characterized in that prior to the coiling, in particular before the optional annealing of the aluminum foil is a one- or two-sided coating of the aluminum foil with at least one functional coating. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass die Aluminiumfolie beim Kaltwalzen gedoppelt wird und das Auftragen der funktionalen Beschichtung der Aluminiumfolie während des oder nach dem Entdoppeln der Aluminiumfolien erfolgt.Method according to claim 1,
characterized in that the aluminum foil is doubled during cold rolling and the application of the functional coating of the aluminum foil takes place during or after the doubling of the aluminum foils. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Aluminiumfolie vor dem Aufhaspeln besäumt und auf Maß geschnitten wird, wobei beim Besäumen oder Schneiden der Aluminiumfolie die funktionale Beschichtung der Aluminiumfolie aufgetragen wird.Method according to claim 1 or 2,
characterized in that the aluminum foil is trimmed prior to coiling and cut to size, wherein the trimming or cutting of the aluminum foil, the functional coating of the aluminum foil is applied. Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass das Beschichten der Aluminiumfolie unter Verwendung eines Lösungsmittels, insbesondere eines Walzöls, erfolgt und vor dem Aufhaspeln der Aluminiumfolie zumindest eine Wärmebehandlung der Aluminiumfolie zur Entfernung des Lösungsmittels, insbesondere des Walzöls, durchgeführt wird.Method according to one of claims 1 to 3,
characterized in that the coating of the aluminum foil is carried out using a solvent, in particular a rolling oil, and before the coiling of the aluminum foil, at least one heat treatment of the aluminum foil to remove the solvent, in particular the rolling oil is performed. Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass die Beschichtung der Aluminiumfolie unter Verwendung eines Sprüh- oder Walzenauftragswerk aufgetragen wird.Method according to one of claims 1 to 4,
characterized in that the coating of the aluminum foil is applied using a spray or roller applicator. Verfahren nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, dass die Aluminiumfolie eine Dicke von 2 bis 100 µm aufweist.Method according to one of claims 1 to 5,
characterized in that the aluminum foil has a thickness of 2 to 100 microns. Verfahren nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass eine funktionale Beschichtung mit Haftvermittler-, Release-, Korrosionsschutz- und/oder Benetzungsvermittlereigenschaften aufgetragen wird.Method according to one of claims 1 to 6,
characterized in that a functional coating having adhesion promoter, release, corrosion protection and / or wetting imparting properties is applied. Verfahren nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass die Eigenschaften der Beschichtung, insbesondere die Haftvermittlungseigenschaft und/oder Benetzungsvermittlungseigenschaft nachträglich aktivierbar sind.Method according to one of claims 1 to 7,
characterized in that the properties of the coating, in particular the adhesion-promoting property and / or wetting imparting property are subsequently activatable. Verfahren nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass die funktionale Beschichtung eine Pfropfschicht, insbesondere aus selbstorganisierenden Molekülen, vorzugsweise aus Phosphonsäuren, Sulfonsäuren, Carbonsäuren oder deren Verbindungen oder Silanen gebildet wird.Method according to one of claims 1 to 8,
characterized in that the functional coating is a grafting layer, in particular of self-organizing molecules, preferably formed from phosphonic acids, sulfonic acids, carboxylic acids or their compounds or silanes. Verfahren nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, dass Phosphonsäure oder deren Derivate, insbesondere substituierten Diglycerid-Phosphonate, Alkylendiphosphonate oder Alkoxysilane zur Bildung der Pfropfschicht verwendet werden.Method according to one of claims 1 to 9,
characterized in that phosphonic acid or its derivatives, in particular substituted diglyceride phosphonates, alkylenediphosphonates or alkoxysilanes are used to form the graft layer. Aluminiumfolie aus Aluminium oder einer Aluminiumlegierung mit einer funktionalen Beschichtung hergestellt durch ein Verfahren nach Anspruch 1 bis 10.An aluminum foil or an aluminum alloy aluminum foil having a functional coating produced by a method according to claims 1 to 10. Verwendung einer Aluminiumfolie nach Anspruch 11 zur Herstellung von Verbundmaterialien, insbesondere sterilisierbarer Verbundmaterialien oder sterilisierbarer Verpackungsmittel.Use of an aluminum foil according to claim 11 for the production of composite materials, in particular sterilizable composite materials or sterilizable packaging material.
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CN113235024A (en) * 2021-05-10 2021-08-10 广西正润新材料科技有限公司 Annealing method in production of medium-high voltage electronic aluminum foil for high-capacity high-strength capacitor

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EP1837091B1 (en) 2010-05-12
DE502007003688D1 (en) 2010-06-24

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