EP0672606B1 - Metal foil coil, procedure for its production and device to carry out the procedure - Google Patents

Metal foil coil, procedure for its production and device to carry out the procedure Download PDF

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Publication number
EP0672606B1
EP0672606B1 EP95102123A EP95102123A EP0672606B1 EP 0672606 B1 EP0672606 B1 EP 0672606B1 EP 95102123 A EP95102123 A EP 95102123A EP 95102123 A EP95102123 A EP 95102123A EP 0672606 B1 EP0672606 B1 EP 0672606B1
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EP
European Patent Office
Prior art keywords
sleeve
metal foil
wall
winding
chambers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP95102123A
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German (de)
French (fr)
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EP0672606A1 (en
Inventor
Stefan Dr. Kästner
Ulrich Hampel
Josef Pakula
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Vereinigte Aluminium Werke AG
Vaw Aluminium AG
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Vereinigte Aluminium Werke AG
Vaw Aluminium AG
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Publication of EP0672606A1 publication Critical patent/EP0672606A1/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
    • B21C47/28—Drums or other coil-holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes

Definitions

  • the invention relates to a metal foil bundle, consisting of a winding sleeve, the inside diameter of which corresponds to the outside diameter of a sleeve receiver, the winding sleeve being designed as a hollow chamber shaft with at least two chambers arranged between the outer and inner walls of the sleeve, and the outer wall or the inner wall of the hollow chamber shaft in the central region has an increased wall thickness with a wall thickness transition zone, and further consists of a metal foil wound into a bundle.
  • a metal foil bundle of the type mentioned at the outset is known from EP-A-500515.
  • Conical surfaces are arranged in the wall thickness transition zone.
  • So-called linkage elements are positioned above it, which consist of two rings and an intermediate connecting element made of elastic material.
  • Tubes in particular steel tubes with an inner diameter of 150 mm and a wall thickness of 6 mm, are usually used for winding aluminum foils. Small quantities under 1000 kg can only be obtained from the film manufacturer in exceptional cases, since film production is a rationalized production.
  • the cold-rolled strips After the cold-rolled strips have been processed into aluminum foils, they are wound up and subjected to an annealing treatment.
  • the metal foil bundles are transported with corresponding sleeve receivers via various transport devices between scissors, annealing furnaces and the shipping point.
  • the risk of tearing is particularly critical in the case of aluminum foils made of pure aluminum with purity Al 99 to Al 99.5, since these are processed in the "soft" state. It is known that films of this composition have very low tensile strength and elongation values.
  • the object of the present invention is to increase the stability of a metal foil bundle, so that foil tearing can be avoided even at high winding and unwinding speeds and with an increased number of linear meters. Furthermore, the winding tube should remain dimensionally stable even when subjected to changes in temperature (400 ° C / 10 t load).
  • the vibration-damping effect of the hollow chamber shaft according to the invention is further enhanced by the fact that the chamber volume contains no internals in the radial direction and has support disks distributed only over the length of the winding tube. It has been shown that at very high speeds the tendency to imbalance or bulge of the outer sleeve in the central region is particularly pronounced, so that a correspondingly dimensioned counterforce must be applied here. It is envisaged that the outer chamber volumes are larger than the volume of the inner chamber seen over the longitudinal axis of the winding tube.
  • the outer wall of the hollow chamber shaft has an increased wall thickness in the central region.
  • step-shaped shoulders are worked in to accommodate appropriately dimensioned support disks.
  • the heels are designed as shrink fit, so that the support disks are inserted in excess after heating the outer sleeve and then shrunk when the outer wall cools down.
  • the winding tube has, for example, an outer core diameter of 30 cm and an inner core diameter of 15 cm with a total length of 180 cm. A film with a thickness of 6 ⁇ m and a width of 160 cm can be wound onto this sleeve.
  • the winding tube according to the invention enables a film length of 64 km to be wound up, which leads to a winding diameter of the wound film of approximately 80 to 90 cm.
  • the wound foil is subjected to an annealing process in which the metal foil bundle is brought from room temperature to a temperature of 360 ° C. within a few hours and is held there for several days. This temperature treatment serves to thermally temper the film material.
  • the thermal treatment creates a high thermal load on the winding tube, which is held at both ends under a weight load of approx. 10 t.
  • deformations can occur on the winding tube during the annealing process. These not only result from the load on the film winding, but also from the thermal expansion, stresses occur inside the winding tube.
  • the inner wall should be brought to a smaller diameter by cooling so that the support disks can be pushed on and then shrunk on with a slow increase in temperature.
  • the inner diameter of the winding tube lies in a range between 100 and 200 mm and the metal foil wound on the outer diameter has a thickness of 0.0045 to 0.06 mm corresponding to 4.5 to 60 ⁇ m.
  • the outside diameter of the bundle is between 500 and 1000 mm with a bundle width of 800 to 2020 mm, which results in a total weight of approx. 10,000 kg when fully wound.
  • a metal foil bundle consists of a hollow chamber shaft with at least one hollow chamber arranged between the outer and inner walls. This increases the rigidity of the winding tube, and the formation of 3 chambers has proven to be particularly favorable.
  • the two outer chambers are designed with a smaller wall thickness than the middle chamber.
  • the aluminum foil 7 is wound up in such a way that the side edges protrude beyond the transverse walls of the middle chamber. With this arrangement there is a favorable compromise between the stability of the hollow chamber shaft, low weight of the winding tube and favorable vibration behavior.
  • the winding tube according to the invention is shown as a hollow shaft. Between the outer tube 1 and the inner tube 2 there is the hollow chamber 3, which is divided by a plurality of transverse walls 4a, b. Annular flange surfaces 5, 6 are arranged at the front ends.
  • the winding tube according to the invention is shown enlarged as a partial cross section.
  • a transverse wall 4b and the annular flange part 6 can be seen between the outer tube 1 and the inner tube 2.
  • the outer tube 1 can be formed with a graduated wall thickness, the thin end being arranged towards the end face and the thicker middle part between the transverse walls 4a, 4b.
  • the stepped outer wall 1 in the central region I is approximately 2 times thicker than the thickness of the inner tube 2. This has the advantage that the deflection of the outer shaft is reduced due to the weight of the metal foil bundle. In addition, the dynamic rigidity when winding and unwinding the film is improved.
  • the transverse wall 4b shrunk in the outer wall 1 is additionally provided with a weld seam secured.
  • T the tolerance compensation
  • the metal foil bundle according to the invention consisting of a winding tube with outer tube 1 and inner tube 2 is shown.
  • the aluminum foil 7 is arranged on the outer tube 1 in a multiplicity of thin layers.
  • sleeve spacings H 75 - 120 mm are selected. At a given peripheral speed, the speeds can be halved compared to an outer diameter of 150 mm.
  • the hollow chamber shaft should not contain any internals in the radial direction.
  • Each chamber is delimited by the outer cylinder which is formed by the outer wall 1 and by an inner cylinder which is formed by the inner wall 2. This enables the thermal expansion of the material to take place unhindered in the radial direction when it is heated to approximately 360 ° without local deformations occurring.
  • the surface pressure exerted on the winding tube from the wound film is particularly critical. With a thickness of 6 ⁇ m, unbalance or vibrations of the winding tube create tension in the film web, which can exceed the maximum strength. Then cracks or other partially invisible damage occur, which are later recognized when the foil is unwound and then lead to a rejection of the entire metal foil bundle.
  • the change in the metal foil bundle can be improved by increasing the sleeve diameter.
  • the inventive dimensioning of the outer diameter to 1.5 to 2.5 times the inner diameter of the sleeve ensures that the surface pressure when starting the film bundle can be kept low and thus damage to the film, which can later lead to a crack , be avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Metal Rolling (AREA)
  • Press Drives And Press Lines (AREA)
  • Laminated Bodies (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)

Abstract

The metal foil union comprises a winding casing, the ID of which corresponds to the OD of a casing receiver. The winding casing is formed as a shaft with hollow chambers. The outer wall (1) or the inner wall of the hollow chamber shaft in the central area has an increased wall thickness and in the wall thickness transition zone an extension with a shrink seat is formed, into which a ring disc is shrunk, which closes an inner chamber between the outer and inner walls (1,2). At the face end of the hollow chamber shaft a ring-shaped flange part (5,6) is arranged, which is firmly connected with the outer and inner walls, thus forming two outer chambers.

Description

Die Erfindung betrifft ein Metallfolienbund, bestehend aus einer Wickelhülse, deren Innendurchmesser dem Außendurchmesser eines Hülsenaufnehmers entspricht, wobei die Wickelhülse als Hohlkammerwelle mit mindestens zwei zwischen Außen- und Innenwand der Hülse angeordneten Kammern ausgebildet ist und wobei die Außenwand oder die Innenwand der Hohlkammerwelle im mittleren Bereich eine erhöhte Wandstärke mit einer Wandstärkenübergangszone aufweist, und ferner bestehend aus einer zu einem Bund aufgewickelten Metallfolie.The invention relates to a metal foil bundle, consisting of a winding sleeve, the inside diameter of which corresponds to the outside diameter of a sleeve receiver, the winding sleeve being designed as a hollow chamber shaft with at least two chambers arranged between the outer and inner walls of the sleeve, and the outer wall or the inner wall of the hollow chamber shaft in the central region has an increased wall thickness with a wall thickness transition zone, and further consists of a metal foil wound into a bundle.

Ein Metallfolienbund der eingangs genannten Art ist aus der EP-A-500515 bekannt. In der Wandstärkenübergangszone sind konische Flächen angeordnet. Darüber sind sogenannte Anlenkglieder positioniert, die aus zwei Ringen und einem dazwischenliegenden Verbindungselement aus elastischem Material bestehen.A metal foil bundle of the type mentioned at the outset is known from EP-A-500515. Conical surfaces are arranged in the wall thickness transition zone. So-called linkage elements are positioned above it, which consist of two rings and an intermediate connecting element made of elastic material.

Zum Aufwickeln von Aluminiumfolien werden üblicherweise Rohre, insbesondere Stahlrohre mit einem Innendurchmesser von 150 mm und einer Wandstärke von 6 mm verwendet. Kleinmengen unter 1000 kg sind nur in Ausnahmefällen vom Folienhersteller zu beziehen, da es sich bei der Folienherstellung um eine durchrationalisierte Fertigung handelt.Tubes, in particular steel tubes with an inner diameter of 150 mm and a wall thickness of 6 mm, are usually used for winding aluminum foils. Small quantities under 1000 kg can only be obtained from the film manufacturer in exceptional cases, since film production is a rationalized production.

Nach der Verarbeitung der kaltgewalzten Bänder zu Aluminiumfolien werden diese aufgewickelt und einer Glühbehandlung unterzogen. Hierzu werden die Metallfolienbunde mit entsprechenden Hülsenaufnehmern über verschiedene Transporteinrichtungen zwischen Scheren, Glühöfen und Versandstelle transportiert.After the cold-rolled strips have been processed into aluminum foils, they are wound up and subjected to an annealing treatment. For this purpose, the metal foil bundles are transported with corresponding sleeve receivers via various transport devices between scissors, annealing furnaces and the shipping point.

Die beim Auf- und Abwickeln auftretenden hohen Drehzahlen der Metallfolienbunde bewirkten Schwingungen bzw. Vibrationen in den unter Zugspannung stehenden Lagen der Folien und können bei den dünnen Folien leicht zu Rissen führen, wodurch u. U. das gesamte Metallfolienbund unbrauchbar wird. Die Rißgefahr ist insbesondere bei Aluminiumfolien aus Reinaluminium mit Reinheit Al 99 bis Al 99,5 kritisch, da diese im Zustand "weich" verarbeitet werden. Es ist bekannt, daß Folien dieser Zusammensetzung sehr niedrige Zugfestigkeits- und Dehnungswerte aufweisen.The high speeds of the metal foil bundles occurring during winding and unwinding caused oscillations or vibrations in the tensioned layers of the foils and can easily lead to cracks in the thin foils, whereby u. U. the entire metal foil bundle is unusable. The risk of tearing is particularly critical in the case of aluminum foils made of pure aluminum with purity Al 99 to Al 99.5, since these are processed in the "soft" state. It is known that films of this composition have very low tensile strength and elongation values.

Aufgabe der vorliegenden Erfindung ist es, die Stabilität eines Metallfolienbundes zu erhöhen, so daß selbst bei hohen Auf- und Abwickelgeschwindigkeiten und bei erhöhter Laufmeterzahl ein Folienabriß vermieden werden kann. Ferner soll die Wickelhülse auch bei Temperturwechselbeanspruchung (400 °C/10 t Auflast) dimensionsstabil bleiben.The object of the present invention is to increase the stability of a metal foil bundle, so that foil tearing can be avoided even at high winding and unwinding speeds and with an increased number of linear meters. Furthermore, the winding tube should remain dimensionally stable even when subjected to changes in temperature (400 ° C / 10 t load).

Die Aufgabe wird erfindungsgemäß durch die im Anspruch 1 angegebenen Merkmale gelöst. Es hat sich gezeigt, daß durch Ausbildung der Wickelhülse als Hohlkammerwelle Vibrationen vermieden und die Auf- und Abwickelnaht derart reduziert werden kann, daß selbst bei Folien aus Reinaluminium im Zustand weich keine Rißbildungen mehr auftraten.The object is achieved by the features specified in claim 1. It has been shown that by designing the winding tube as a hollow chamber shaft, vibrations can be avoided and the winding and unwinding seam can be reduced in such a way that even with foils made of pure aluminum in the soft state, no more cracks occurred.

Die vibrationsdämpfende Wirkung der erfindungsgemäßen Hohlkammerwelle wird dadurch noch verstärkt, daß das Kammervolumen in radialer Richtung keine Einbauten enthält und nur über die Länge der Wickelhülse verteilte Stützscheiben aufweist. Es hat sich nämlich gezeigt, daß bei sehr hohen Drehzahlen die Neigung zu Unwuchten bzw. Aufwölbungen der Außenhülse im Mittelbereich besonders ausgeprägt ist, so daß hier eine entsprechend dimensionierte Gegenkraft aufgebracht werden muß. Es ist vorgesehen, daß die außenliegenden Kammervolumina größer sind als das Volumen der über die Längsachse der Wickelhülse gesehenen innenliegenden Kammer.The vibration-damping effect of the hollow chamber shaft according to the invention is further enhanced by the fact that the chamber volume contains no internals in the radial direction and has support disks distributed only over the length of the winding tube. It has been shown that at very high speeds the tendency to imbalance or bulge of the outer sleeve in the central region is particularly pronounced, so that a correspondingly dimensioned counterforce must be applied here. It is envisaged that the outer chamber volumes are larger than the volume of the inner chamber seen over the longitudinal axis of the winding tube.

Zur Verhinderung der Aufwölbung trägt weiterhin bei, daß die Außenwand der Hohlkammerwelle im Mittelbereich eine erhöhte Wandstärke aufweist. In der Wandstärkenübergangszone sind jeweils stufenförmige Absätze eingearbeitet, um entsprechend dimensionierte Stützscheiben aufzunehmen. Die Absätze sind als Schrumpfsitze ausgebildet, so daß die Stützscheiben nach dem Erwärmen der Außenhülse mit Übermaß eingelegt und dann beim Abkühlen der Außenwand eingeschrumpft werden.To prevent the bulging further contributes to the fact that the outer wall of the hollow chamber shaft has an increased wall thickness in the central region. In the wall thickness transition zone, step-shaped shoulders are worked in to accommodate appropriately dimensioned support disks. The heels are designed as shrink fit, so that the support disks are inserted in excess after heating the outer sleeve and then shrunk when the outer wall cools down.

Die Wickelhülse besitzt beispielsweise einen äußeren Kerndurchmesser von 30 cm und einen Innenkerndurchmesser von 15 cm bei einer Gesamtlänge von 180 cm. Auf diese Hülse kann eine Folie von 6 µm Dicke mit einer Breite von 160 cm aufgewickelt werden. Die erfindungsgemäße Wickelhülse ermöglicht das Aufwickeln einer Folienlänge von 64 km, was zu einem Wickeldurchmesser der aufgewickelten Folie von ca. 80 bis 90 cm führt.The winding tube has, for example, an outer core diameter of 30 cm and an inner core diameter of 15 cm with a total length of 180 cm. A film with a thickness of 6 µm and a width of 160 cm can be wound onto this sleeve. The winding tube according to the invention enables a film length of 64 km to be wound up, which leads to a winding diameter of the wound film of approximately 80 to 90 cm.

Die aufgewickelte Folie wird einem Glühprozeß unterworfen, bei dem das Metallfolienbund von Raumtemperatur innerhalb mehrerer Stunden auf eine Temperatur von 360 °C gebracht wird und dort für mehrere Tage gehalten wird. Diese Temperaturbehandlung dient der thermischen Vergütung des Folienmaterials.The wound foil is subjected to an annealing process in which the metal foil bundle is brought from room temperature to a temperature of 360 ° C. within a few hours and is held there for several days. This temperature treatment serves to thermally temper the film material.

Gleichzeitig entsteht mit der Temperaturbehandlung eine hohe thermische Belastung der Wickelhülse, die an beiden Enden gehalten unter einer Gewichtslast von ca. 10 t steht. Untersuchungen haben gezeigt, daß bei dem Glühprozeß Verformungen an der Wickelhülse auftreten können. Diese rühren nicht nur von der Auflast der Folienwicklung her, sondern auch von der Wärmedehnung treten Beanspruchungen im Inneren der Wickelhülse auf.At the same time, the thermal treatment creates a high thermal load on the winding tube, which is held at both ends under a weight load of approx. 10 t. Studies have shown that deformations can occur on the winding tube during the annealing process. These not only result from the load on the film winding, but also from the thermal expansion, stresses occur inside the winding tube.

Bei einer Versteifung der Wickelhülse muß darauf geachtet werden, daß keine inneren Verspannungen durch unterschiedliche Wärmedehnungen entstehen. Erfindungsgemäß wurde dieses Problem dadurch gelöst, daß ein Toleranzausgleich zwischen den Ring scheiben und der Innen- bzw. Außenhülse vorgesehen ist. Die Ringscheiben sind nur in der Außenhülse eingeschrumpft und teilweise mit der Außenwand bei X, Y verschweißt. Dadurch ist ein Toleranzausgleich gegeben, so daß auch nach einem Glühprozeß der Rundlauf des erfindungsgemäßen Metallfolienbundes die vorgegebenen Toleranzwerte einhält. Die Toleranzwerte liegen wie folgt:

  • 1. Rundlauf vor dem Glühen ± 0,1 mm
  • 2. Rundlauf nach dem Glühen ± 0,3 mm
If the winding tube is stiffened, care must be taken to ensure that there are no internal strains caused by different thermal expansions. According to the invention this problem was solved in that a tolerance compensation between the ring discs and the inner or outer sleeve is provided. The washers are only shrunk in the outer sleeve and partially welded to the outer wall at X, Y. This results in tolerance compensation, so that even after an annealing process, the concentricity of the metal foil bundle according to the invention complies with the specified tolerance values. The tolerance values are as follows:
  • 1. Concentricity before annealing ± 0.1 mm
  • 2. Concentricity after annealing ± 0.3 mm

VergleichsbeispielComparative example

Bei einem Metallfolienbund das auf einem Stahlrohr aufgewickelt wurde, konnten folgende Werte ermittelt werden:

  • 3. Rundlauf vor dem Glühen ± 0,8 mm
  • 4. Rundlauf nach dem Glühen ± 1,3 mm
The following values could be determined for a metal foil bundle that was wound on a steel tube:
  • 3. Concentricity before annealing ± 0.8 mm
  • 4. Concentricity after annealing ± 1.3 mm

Dies zeigt, daß bei dem Vergleichsbeispiel der Wärmeeinfluß beim Glühen offensichtlich zu einer Durchbiegung der Wickelhülse führt, so daß hier erhebliche Unwuchten auftreten können.This shows that in the comparative example the influence of heat during annealing obviously leads to a deflection of the winding tube, so that considerable imbalances can occur here.

Es ist auch möglich, die Innenwand entsprechend auszubilden, so daß hier ein Paßsitz eingedreht werden kann. Dann sollte zur Erzielung eines Schrumpfsitzes die Innenwand durch Kühlen auf einen niedrigeren Durchmesser gebracht werden, damit die Stützscheiben aufgeschoben werden können und anschließend bei langsamer Temperaturerhöhung aufgeschrumpft werden.It is also possible to design the inner wall accordingly, so that a snug fit can be screwed in here. Then, to achieve a shrink fit, the inner wall should be brought to a smaller diameter by cooling so that the support disks can be pushed on and then shrunk on with a slow increase in temperature.

Wegen der hohen Umfangsgeschwindigkeiten und zur Erhöhung der Sicherheit hat es sich als zweckmäßig erwiesen, die Stützscheiben zusätzlich zu dem Paßsitz an der Außen- und/oder Innenwand durch eine Schweißnaht anzuheften. Dieses beeinflußt auch den Luftwiderstand bei hohen Umdrehungsgeschwindigkeiten günstig, da die außenliegenden Ringscheiben die Seitenflächen des Metallfolienbundes vollständig abdichten.Because of the high circumferential speeds and to increase security, it has proven to be advantageous to attach the support disks to the outer and / or inner wall in addition to the snug fit by means of a weld seam. This also has a favorable influence on the air resistance at high rotational speeds, since the outer ring disks completely seal the side surfaces of the metal foil bundle.

Erfindungsgemäß liegt der Innendurchmesser der Wickelhülse in einem Bereich zwischen 100 und 200 mm und die auf den Außendurchmesser aufgewickelte Metallfolie weist eine Dicke von 0,0045 bis 0,06 mm entsprechend 4,5 bis 60 µm auf. Der Bundaussendurchmesser liegt zwischen 500 und 1000 mm bei einer Bundbreite von 800 bis 2020 mm, wodurch bin Gesamtgewicht von ca. 10.000 kg bei voller Aufwickelung verursacht wird.According to the invention, the inner diameter of the winding tube lies in a range between 100 and 200 mm and the metal foil wound on the outer diameter has a thickness of 0.0045 to 0.06 mm corresponding to 4.5 to 60 µm. The outside diameter of the bundle is between 500 and 1000 mm with a bundle width of 800 to 2020 mm, which results in a total weight of approx. 10,000 kg when fully wound.

Zum Aufwickeln von Metallfolien besteht ein Metallfolienbund aus einer Hohlkammerwelle mit mindestens einer zwischen der Außen- und Innenwand angeordneten Hohlkammer. Hierdurch wird die Steifigkeit der Wickelhülse verstärkt, wobei sich die Ausbildung von 3 Kammern als besonders günstig erwiesen hat. Hierbei sind die beiden außenliegenden Kammern in geringerer Wandstärke ausgebildet als die mittlere Kammer. Die Aluminiumfolie 7 wird derart aufgewickelt, daß die Seitenränder über die Querwände der mittleren Kammer hinausragen. Mit dieser Anordnung ist ein günstiger Kompromiß zwischen Stabilität der Hohlkammerwelle, geringem Gewicht der Wickelhülse und günstigem Schwingungsverhalten gegeben.For winding metal foils, a metal foil bundle consists of a hollow chamber shaft with at least one hollow chamber arranged between the outer and inner walls. This increases the rigidity of the winding tube, and the formation of 3 chambers has proven to be particularly favorable. The two outer chambers are designed with a smaller wall thickness than the middle chamber. The aluminum foil 7 is wound up in such a way that the side edges protrude beyond the transverse walls of the middle chamber. With this arrangement there is a favorable compromise between the stability of the hollow chamber shaft, low weight of the winding tube and favorable vibration behavior.

Im folgenden wird die Erfindung anhand eines Ausführungsbeispieles näher beschrieben.The invention is described in more detail below using an exemplary embodiment.

Es zeigen:

Figur 1
Längsschnitt durch eine erfindungsgemäße Wickelhülse,
Figur 2a, b
vergrößerte Teile des Längsschnittes durch ein Stirnende der erfindungsgemäßen Wickelhülse und
Figur 3
Längsschnitt durch ein erfindungsgemäßes Metallfolienbund.
Show it:
Figure 1
Longitudinal section through a winding tube according to the invention,
Figure 2a, b
enlarged parts of the longitudinal section through a front end of the winding tube according to the invention and
Figure 3
Longitudinal section through a metal foil bundle according to the invention.

In Figur 1 ist die erfindungsgemäße Wickelhülse als Hohlkammerwelle dargestellt. Zwischen dem Außenrohr 1 und dem Innenrohr 2 befindet sich die Hohlkammer 3, die durch mehrere Querwände 4a,b unterteilt ist. An den stirnseitigen Enden sind ringförmige Flanschflächen 5,6 angeordnet.In Figure 1, the winding tube according to the invention is shown as a hollow shaft. Between the outer tube 1 and the inner tube 2 there is the hollow chamber 3, which is divided by a plurality of transverse walls 4a, b. Annular flange surfaces 5, 6 are arranged at the front ends.

In den Figuren 2a, b ist die erfindungsgemäße Wickelhülse als Teilquerschnitt vergrößert dargestellt. Zwischen dem Außenrohr 1 und den Innenrohr 2 sind eine Querwand 4b und der ringförmige Flanschteil 6 erkennbar. In einer besonderen Ausführungsform kann das Außenrohr 1 mit abgestufter Wanddicke ausgebildet sein, wobei das dünne Ende zur Stirnseite hin und das dickere Mittelteil zwischen den Querwänden 4a,4b angeordet ist.2a, b, the winding tube according to the invention is shown enlarged as a partial cross section. A transverse wall 4b and the annular flange part 6 can be seen between the outer tube 1 and the inner tube 2. In a special embodiment, the outer tube 1 can be formed with a graduated wall thickness, the thin end being arranged towards the end face and the thicker middle part between the transverse walls 4a, 4b.

In der bevorzugten Ausbildung nach den Figuren 2a, b ist die abgestufte Außenwand 1 im mittleren Bereich I etwa 2 x dicker als die Dicke des Innenrohres 2 ausgeführt. Dieses hat den Vorteil, daß die Durchbiegung der Außenwelle aufgrund des Gewichtes des Metallfolienbundes reduziert wird. Außerdem ist die dynamische Steifigkeit beim Auf- und Abwickeln der Folie verbessert.In the preferred embodiment according to FIGS. 2a, b, the stepped outer wall 1 in the central region I is approximately 2 times thicker than the thickness of the inner tube 2. This has the advantage that the deflection of the outer shaft is reduced due to the weight of the metal foil bundle. In addition, the dynamic rigidity when winding and unwinding the film is improved.

Gemäß Figur 2b ist die in der Außenwand 1 eingeschrumpfte Querwand 4b zusätzlich mit einer Schweißnaht

Figure imgb0001
Figure imgb0001
gesichert. Am Fußende der Querwand 4b befindet sich ein Toleranzausgleich T zum Innenrohr 2 hin. Dieser verhindert eine Verspannung bei hohen Temperaturbelastungen.According to FIG. 2b, the transverse wall 4b shrunk in the outer wall 1 is additionally provided with a weld seam
Figure imgb0001
Figure imgb0001
secured. At the foot of the transverse wall 4b there is a tolerance compensation T towards the inner tube 2. This prevents tension at high temperature loads.

In Figur 3 ist das erfindungsgemäße Metallfolienbund, bestehend aus einer Wickelhülse mit Außenrohr 1 und Innenrohr 2 dargestellt. Die Aluminiumfolie 7 ist auf dem Außenrohr 1 in einer Vielzahl von dünnen Lagen angeordnet.In Figure 3, the metal foil bundle according to the invention, consisting of a winding tube with outer tube 1 and inner tube 2 is shown. The aluminum foil 7 is arranged on the outer tube 1 in a multiplicity of thin layers.

Als Beispiel für einen geeigneten Außendurchmesser von 300 mm werden Hülsenabstände H = 75 - 120 mm gewählt. Bei einer vorgegebenen Umfangsgeschwindigkeit können die Drehzahlen gegenüber einem Außendurchmesser von 150 mm halbiert werden.As an example for a suitable outer diameter of 300 mm, sleeve spacings H = 75 - 120 mm are selected. At a given peripheral speed, the speeds can be halved compared to an outer diameter of 150 mm.

Gegenüber dem bisherigen Stand der Technik ergeben sich folgende Unterschiede:

  • 1. Der Außendurchmesser der Wickelhülse 1 ist vergrößert worden.
  • 2. Bei konstanter Geschwindigkeit (im Vergleich zur bisherigen Verfahrensweise) wird die Drehzahl am Außenumfang der Hülse halbiert.
  • 3. Durch die Hohlkammerwelle wird die Neigung zu Vibrationen und Schwingungen beim Auf- und Abwickeln reduziert.
  • 4. Die beim Rollenwechsel erforderliche Abbremsung kann verkürzt werden, da die auftretenden Zugkräfte in der Folien niedrig gehalten werden.
  • 5. Der Innendurchmesser der Wickelhülse wird konstant gehalten, so daß die bisher verwendeten Hülsenaufnehmer weiter verwendet werden können.
  • 6. Durch die geringe Exentrizität können die auftretenden Zugkräfte in den Folien bei der Verarbeitung gering gehalten werden. Beim An- und Abfahren treten keine Spannungsspitzen auf.
The following differences result from the previous state of the art:
  • 1. The outer diameter of the winding tube 1 has been enlarged.
  • 2. At constant speed (compared to the previous procedure), the speed is halved on the outer circumference of the sleeve.
  • 3. The hollow shaft reduces the tendency to vibrate and oscillate when winding and unwinding.
  • 4. The braking required when changing the reel can be shortened, since the tensile forces occurring in the film are kept low.
  • 5. The inner diameter of the winding tube is kept constant so that the tube receptacles previously used can continue to be used.
  • 6. Due to the low eccentricity, the tensile forces occurring in the foils can be kept low during processing. There are no voltage peaks when starting and stopping.

Es ist vorteilhaft, wenn die Zwischentrennwände auf einem eingedrehten Pass-Sitz des Außenrohres aufgesteckt werden und im Innenrohr eingeschrumpft sind. Dies bewirkt zusammen mit den übrigen Konstruktionsmerkmalen der Radialhohlkammer einen sehr guten statischen Rundlauf der erfindungsgemäßen Wickelhülse. Bisher war der Rundlauf nach dem ersten Glühen der Wickelhülse nicht ausreichend, da die Abweichung im Radius mehr als 0,5 mm betrug. Jetzt zeigt die erfindungsgemäße Hohlkammerkonstruktion eine sehr gute Thermostabilität nach dem Glühen. Die Radius-Abweichung ist kleiner als 0,1 mm.It is advantageous if the intermediate partitions are plugged onto a screwed-in fit of the outer tube and are shrunk into the inner tube. Together with the other design features of the radial hollow chamber, this results in very good static concentricity of the winding tube according to the invention. So far, the concentricity after the first annealing of the winding tube was not sufficient, since the deviation in the radius was more than 0.5 mm. The hollow chamber construction according to the invention now shows very good thermal stability after annealing. The radius deviation is less than 0.1 mm.

Anhand von Versuchen wurde ermittelt, daß der Aufbau der erfindungsgemäßen Wickelhülse wie folgt durchgeführt werden muß:It was determined on the basis of tests that the winding sleeve according to the invention had to be constructed as follows:

Die Hohlkammerwelle soll in radialer Richtung keine Einbauten enthalten. Jede Kammer wird durch den Außenzylinder, der von der Außenwand 1 gebildet wird und durch einen Innenzylinder, der von der Innenwand 2 gebildet wird, begrenzt. Hierdurch ist es möglich, daß die Wärmedehnung des Materials bei einem Aufheizen auf ca. 360 ° ungehindert in radialer Richtung erfolgen kann, ohne daß lokale Deformationen auftreten können.The hollow chamber shaft should not contain any internals in the radial direction. Each chamber is delimited by the outer cylinder which is formed by the outer wall 1 and by an inner cylinder which is formed by the inner wall 2. This enables the thermal expansion of the material to take place unhindered in the radial direction when it is heated to approximately 360 ° without local deformations occurring.

Dabei ist zu beachten, daß nach einer Glühbehandlung des Metallfolienbundes eine Abkühlung erfolgt, die wiederum zu starken thermischen Spannungen in dem großvolumigen Metallfolienbund führt. Die nach außen weisenden Bereiche des Metallfolienbundes werden naturgemäß schneller abgekühlt als die inneren Bereiche, so daß hier erhebliche Schrumpfspannungen auftreten. Dieses gilt auch für die Innenwand der Wickelhülse, die dem Kühlstrom verstärkt ausgesetzt ist. Es kann vorkommen, das Temperaturdifferenzen zwischen Innenwand und Außenwand der Wickelhülse auftreten, so daß die Stützscheiben hierdurch stark beansprucht werden. Eine Dimensionsstabilität ist nur dadurch zu erreichen, daß ein Toleranzausgleich in der erfindungsgemäß vorgeschlagenen Weise vorgenommen wird.It should be noted that cooling takes place after annealing the metal foil bundle, which in turn leads to strong thermal stresses in the large-volume metal foil bundle. The outwardly facing areas of the metal foil bundle are naturally cooled faster than the inner areas, so that considerable shrinkage stresses occur here. This also applies to the inner wall of the winding tube, which is increasingly exposed to the cooling flow. It can happen that temperature differences occur between the inner wall and the outer wall of the winding tube, so that the support disks are thereby heavily stressed. Dimensional stability can only be achieved in that tolerance compensation is carried out in the manner proposed according to the invention.

Ganz besonders kritisch ist die von der aufgewickelten Folie her auf die Wickelhülse ausgeübte Flächenpressung. Bei einer Dicke von 6 µm kommt es bei Unwuchten bzw. Vibrationen der Wickelhülse zu Spannung in der Folienbahn, die die maximale Festigkeit überschreiten können. Dann treten Risse oder andere zum Teil unsichtbare Beschädigungen auf, die später beim Abwickeln der Folie erkannt werden und dann zu einem Ausschuß des gesamten Metallfolienbundes führen.The surface pressure exerted on the winding tube from the wound film is particularly critical. With a thickness of 6 µm, unbalance or vibrations of the winding tube create tension in the film web, which can exceed the maximum strength. Then cracks or other partially invisible damage occur, which are later recognized when the foil is unwound and then lead to a rejection of the entire metal foil bundle.

Ein weiterer Gesichtspunkt bei der Herstellung des erfindungsgemäßen Folienbundes ist es, daß durch Vergrößerung des Hülsendurchmessers der Wechsel der Metallfolienbunde verbessert werden kann. Hierbei wird üblicherweise das Ende des einen Bundes mit dem Anfang des neuen Metallfolienbundes verklebt. Beim Anfahren aus dem Stillstand wirken erhebliche Zugkräfte auf die Metallfolie, wobei sich Verformungen der Hülse nachteilig auswirken. Durch die erfindungsgemäß vorgesehene Dimensionierung des Außendurchmessers auf das 1,5 bis 2,5-fache des Innendurchmessers der Hülse wird gewährleistet, daß die Flächenpressung beim Anfahren der Folienbunde niedrig gehalten werden kann und damit Beschädigungen an der Folie, die später zu einem Riß führen können, vermieden werden.Another aspect in the production of the foil bundle according to the invention is that the change in the metal foil bundle can be improved by increasing the sleeve diameter. This usually includes the end of one covenant glued to the beginning of the new metal foil bundle. When starting from a standstill, considerable tensile forces act on the metal foil, with deformations of the sleeve having a disadvantageous effect. The inventive dimensioning of the outer diameter to 1.5 to 2.5 times the inner diameter of the sleeve ensures that the surface pressure when starting the film bundle can be kept low and thus damage to the film, which can later lead to a crack , be avoided.

Claims (3)

  1. A metal foil collar consisting of a winding sleeve whose inner diameter corresponds to the outer diameter of a sleeve receiving part, with the winding sleeve being provided in the form of a hollow chamber shaft with at least two chambers (3) arranged between the outer and inner walls (1, 2) of the sleeve and with the outer wall (1) or inner wall (2) of the hollow chamber shaft, in the central region of same, comprising an increased wall thickness with a wall thickness transition zone, and furthermore consisting of metal foil wound so as to form a collar,
    characterised in
    that into each wall thickness transition zone, there is formed in a step with a shrunk seat into each of which there is shrunk an annular disc (4a, b), which annular discs close an inner chamber between the outer and inner wall (1, 2) and that at each of the end faces of the hollow chamber shaft there is arranged an annular flange part (5, 6) which is firmly connected to the outer and inner walls (1, 2) while forming two outer chambers.
  2. A metal foil collar according to claim 1,
    characterised in
    that the outer chamber volumes formed between the outer annular flange parts (5, 6) and the inner annular discs (4a, b) are greater than the volume of the chamber which, if viewed across the longitudinal axis of the winding sleeve, constitutes the inner chamber.
  3. A metal foil collar according to any one of the preceding claims,
    characterised in
    that the winding sleeve is provided in the form of a hollow chamber sleeve with chambers arranged between the outer and inner walls (1, 2) of the sleeve, with the outer diameter Da of the sleeve amounting to 1.5 to 2.5 times the value of the inner diameter Di of the sleeve;
    that the distance A between the inner and outer walls of the winding sleeve is maintained so as to be proportional to the inner diameter of the winding sleeve, with the ratio A = (0.3 - 1.5) x Di
    Figure imgb0004
     being applied;
    that the chambers in the longitudinal axis of the sleeve are delimited by a plurality of annular discs which subdivide the hollow chamber shaft into a plurality of annular chambers; and
    that the outer annular flange parts (5, 6) fully seal the side faces of the metal foil collar.
EP95102123A 1994-03-19 1995-02-16 Metal foil coil, procedure for its production and device to carry out the procedure Expired - Lifetime EP0672606B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9404689U 1994-03-19
DE9404689U DE9404689U1 (en) 1994-03-19 1994-03-19 Metal foil bundle and winding sleeve therefor

Publications (2)

Publication Number Publication Date
EP0672606A1 EP0672606A1 (en) 1995-09-20
EP0672606B1 true EP0672606B1 (en) 1997-01-22

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EP95102123A Expired - Lifetime EP0672606B1 (en) 1994-03-19 1995-02-16 Metal foil coil, procedure for its production and device to carry out the procedure

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EP (1) EP0672606B1 (en)
AT (1) ATE148072T1 (en)
DE (2) DE9404689U1 (en)
ES (1) ES2099632T3 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE513197C (en) * 1928-03-08 1930-11-24 Johannes Schmidt Disc reel made of metal for receiving in particular wires, the side discs of which consist of two carded sheet metal plates connected to form hollow bodies
US3447674A (en) * 1967-07-14 1969-06-03 William T Fraser Winding core
DE7312632U (en) * 1973-04-04 1973-07-05 Reckwitz & Co Kg HOLLOW CORE MADE OF PLASTIC AS A SUPPORTING ELEMENT FOR PLASTIC FILM ROLLS
DE7422407U (en) * 1974-10-03 Hago Plast Hagemann B Cylindrical bobbin with inner and outer cylinders
EP0562757A1 (en) * 1992-03-20 1993-09-29 GLOSSOP THERMOPLASTICS Ltd Yarn spinning tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1145558A (en) * 1915-01-19 1915-07-06 Benjamin Denver Coppage Non-deflecting roll.
DE2704610C2 (en) * 1977-02-04 1984-03-15 Hoechst Ag, 6230 Frankfurt Control arrangement with a controller for controlling the speed of a connected motor
FI102825B1 (en) * 1991-02-20 1999-02-26 Valmet Corp Winding core

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7422407U (en) * 1974-10-03 Hago Plast Hagemann B Cylindrical bobbin with inner and outer cylinders
DE513197C (en) * 1928-03-08 1930-11-24 Johannes Schmidt Disc reel made of metal for receiving in particular wires, the side discs of which consist of two carded sheet metal plates connected to form hollow bodies
US3447674A (en) * 1967-07-14 1969-06-03 William T Fraser Winding core
DE7312632U (en) * 1973-04-04 1973-07-05 Reckwitz & Co Kg HOLLOW CORE MADE OF PLASTIC AS A SUPPORTING ELEMENT FOR PLASTIC FILM ROLLS
EP0562757A1 (en) * 1992-03-20 1993-09-29 GLOSSOP THERMOPLASTICS Ltd Yarn spinning tube

Also Published As

Publication number Publication date
DE59500095D1 (en) 1997-03-06
DE9404689U1 (en) 1994-05-26
ES2099632T3 (en) 1997-05-16
EP0672606A1 (en) 1995-09-20
ATE148072T1 (en) 1997-02-15

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