EP0393519B1 - Device for winding a foil-web - Google Patents

Device for winding a foil-web Download PDF

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Publication number
EP0393519B1
EP0393519B1 EP90107063A EP90107063A EP0393519B1 EP 0393519 B1 EP0393519 B1 EP 0393519B1 EP 90107063 A EP90107063 A EP 90107063A EP 90107063 A EP90107063 A EP 90107063A EP 0393519 B1 EP0393519 B1 EP 0393519B1
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EP
European Patent Office
Prior art keywords
roller
film
rollers
contact
contact roll
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
Application number
EP90107063A
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German (de)
French (fr)
Other versions
EP0393519A2 (en
EP0393519A3 (en
Inventor
Hajo Dr. Hagens
Thomas Heusel
Reinhard Kober
Stefan Sinzig
Wolfgang Dipl.-Ing. Oberhausen
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Hoechst AG
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Hoechst AG
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Publication date
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Publication of EP0393519A3 publication Critical patent/EP0393519A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/14—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web
    • B65H18/16—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
    • B65H2404/1441—Roller pairs with relative movement of the rollers to / from each other involving controlled actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/40—Shafts, cylinders, drums, spindles
    • B65H2404/43—Rider roll construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/40—Shafts, cylinders, drums, spindles
    • B65H2404/43—Rider roll construction
    • B65H2404/432—Rider roll construction involving a plurality of parallel rider rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/21—Dynamic air effects
    • B65H2601/211—Entrapping air in or under the material

Definitions

  • the invention relates to a device for winding a film web onto a winding core to form a film winding, with a contact roller, via which the film web is fed to the film winding, the contact roller and the film winding running in opposite directions at the same peripheral speed, with two axially parallel to the winding core and to the contact roller rollers arranged in a film wrap, which are in pressure contact with the film web on the film winder or with the film web on the contact roller.
  • Such a device for winding a film web is known from DE-A1 37 10 412 and works, for example, satisfactorily for winding speeds of the film webs up to about 100 m / min with very thin film webs, e.g. 3 ⁇ m PET films.
  • the winding of the film web is of considerable importance as the last step in the process, since here the specification-compliant film web can be so "wrongly" wound that there can be a total loss of the film roll due to damage to the film web, in particular due to storage .
  • a particularly important problem in this connection is the phenomenon that, when the film web is wound, considerable amounts of air are also wrapped in the film roll. A part of this wrapped air escapes from the film roll during storage; This can result in various errors in and on the film roll, such as dips, stretching and transverse waves, which can lead to the film roll being completely unusable.
  • the object of the invention is to improve the device described in the introduction and to further develop it for winding up a film web in such a way that the winding speed can be increased significantly and the application is also possible for ultra-thin films with film thicknesses of up to approximately 1 ⁇ m.
  • the contact roller has a smooth, hard surface layer which has an average roughness Ra less than 0.4 ⁇ m and a Brinell hardness greater than 10 HB 2.5 / 62.5.
  • the advantage is achieved that the rollers for squeezing the air boundary layers with the hard smooth surface of the contact roller with certain hardness and predetermined center roughness work together so effectively that ultra-thin films with significantly increased winding speed compared to the previous method, without loss of hardness Wraps or loss of quality, for example in the wrinkle freedom of the winding, can be wound up.
  • a film web 1 is guided for winding onto a winding core 2 via a contact roller 3 which bears against a film winding 8.
  • the film roll and the contact roller move in opposite directions to each other with the same Peripheral speed.
  • the air boundary layers are squeezed off over the entire width of the film web by mechanical pressure.
  • the distance between the contact or merging point of the two film webs and the pinching points on the film webs, ie the depth of the gusset, which is limited by the film wrap and the contact roller, is kept as small as possible and is 13 to 200 mm.
  • a film web 1 is guided over a contact roller 3, runs onto a winding core 2 or a film winding 8 at a contact point 7 and is wound thereon.
  • the fact that considerable amounts of air occur and are wrapped up in a tapered gusset 6 between the film winding 8 and the contact roller 3 can be explained by the fact that air boundary layers 4, shown hatched in FIG Contact point 7 are promoted.
  • These friction-related air boundary layers 4 exist both on the outside of the film web 1, which is guided over the contact roller 3, and on the circumferential surface or the outer layer of the film web 1 on the film winding 8.
  • the contact roller 3 has a hard, smooth surface layer 20 which has an average roughness Ra less than 0.4 ⁇ m and a Brinell hardness greater than 10 HB 2.5 / 62.5.
  • the Brinell hardness HB is determined according to the Brinell hardness test as defined in the DIN standard 50351.
  • the number combination 2.5 / 62.5 means that the hardness measurement is carried out with a ball of 2.5 mm in diameter, which is pressed against the surface layer 20 with a test force of 62.5 kp ( ⁇ 613 N).
  • the center roughness is chosen the smaller, the thinner the film web to be wound.
  • the average roughness is generally in the range 0.001 ⁇ m ⁇ Ra ⁇ 0.4 ⁇ m, preferably Ra ⁇ 0.03 ⁇ m, measured according to DIN 7162.
  • the device described enables the winding of ultra-thin films, e.g. PET films with a thickness of 2 ⁇ m, at speeds up to approximately 220 m / min.
  • ultra-thin films e.g. PET films with a thickness of 2 ⁇ m
  • the surface layer 20 of the contact roller 3 can also be formed by thermal spraying, e.g. Plasma spraying of oxides or carbides, such as silicon, chromium oxide or silicon carbide, can be applied.
  • thermal spraying e.g. Plasma spraying of oxides or carbides, such as silicon, chromium oxide or silicon carbide, can be applied.
  • the air-displacing rollers 5a and 5b have diameters of 7.5 to 50 mm and extend over the entire width of the film web.
  • the distance between the contact point 7 and the rollers 5a and 5b should be as small as possible in order to avoid the formation of air boundary layers in the gusset 6 or to keep it as small as possible.
  • the diameters of the rollers 5a and 5b are selected to be small compared to the diameter of the contact roller 3 and the winding core 2 or the film roll 8, the diameters of the rollers 5a and 5b generally being the same size, but can also be of different sizes .
  • the roller diameters correspond to 0.1 to 0.5 times, in particular 0.15 to 0.3 times the contact roller diameter and 0.05 to 0.3 times, in particular 0.1 to 0 , 2 times the winding core diameter.
  • the roll 5a which is in contact with the film web 1 on the film roll 8, has a smooth, hard surface layer 21, as can be seen from FIG. 3.
  • the material of the surface layer 21 and the type of application of the surface layer on the roller body of the roller 5a match the material and the type of application the surface layer 20 on the contact roller 3. Because of the small diameter of the roller 5a compared to the contact roller 3, it can also be made of solid material and the surface can then be machined accordingly in order to meet the above-mentioned conditions for hardness and center roughness.
  • the roller 5b which is in contact with the film web 1 on the contact roller 3, has a hard elastic surface, generally a hard rubberized surface.
  • rollers 5a and 5b can only permanently remove the air boundary layers 4 if they are pressed with strong pressure against the film roll 8 rolled up on the winding core 2 or against the film web 1 running over the contact roller 3. This is served by the device parts 9 to 16, which are described below.
  • the roller 5b abutting the contact roller 3 is arranged to be stationary during the seeded winding process, each of which Each end is pressed against the contact roller 3 by a cylinder 11 via an angle lever 10.
  • the two cylinders 11 are in turn attached to the contact roller holder 9.
  • the roller 5a resting on the film winding 8 must be arranged to be movable. This is ensured by a cylinder 12 which is rotatably mounted in a joint 13 and a spacer 16 which is rotatable in joints 14 and 15, which together guide the roller 5a and, with increasing winding diameter, permit its displacement relative to the stationary roller 5b.
  • the spacer 16 and the two joints 14 and 15, for example ball bearing joints, are shown enlarged together with the cylinder 12 in FIG. 2.
  • the contact roller 3 and the film roll 8 and thus also the rollers 5a and 5b have one and the same peripheral speed, for safety reasons there should always be a small distance of 0.2 to 5.0 mm, in particular of between the rollers 5a and 5b 0.5 to 1 mm, can be provided in order to avoid blocking or stuttering in the event of contact when there are small speed differences between the rollers 5a and 5b.
  • the widths of the film webs 1 are up to 1000 mm, but wider film webs can also be used with such Device can be wrapped. If, in the case of wider film webs, the mechanical stability of the rollers 5a and 5b is no longer sufficient with only suspension at the roller ends, then instead of a one-part roller 5a, as shown in FIG. 3, which has a uniform contour or constant diameter over the entire length and is seated on an axis 18, also a roller 5a 'consisting of two or more sections 17, 17' (see FIG. 3) can be used. These sections have a uniform diameter and are also seated on an axis 18. The mechanical load on the multi-part roller can be reduced by attaching further cylinders 11 and 12 to roller spacers 19.
  • the multi-part structure can also be used for the roller 5b, in which case hard elastic or rubber layers are used instead of the surface layers 21.
  • the roller spacers 19 have a diameter smaller than the roller diameter of the sections 17, 17 'and form a recessed roller area between two adjacent sections of the multi-part roller 5a'.

Description

Die Erfindung betrifft eine Vorrichtung zum Aufwickeln einer Folienbahn auf einen Wickelkern zu einem Folienwickel, mit einer Kontaktwalze, über welche die Folienbahn dem Folienwickel zugeführt wird, wobei die Kontaktwalze und der Folienwickel mit gleicher Umfangsgeschwindigkeit gegensinning zueinander laufen, mit zwei achsparallel zum Wickelkern und zur Kontaktwalze in einem Folienzwickel angeordneten Rollen, die in Druckkontakt mit der Folienbahn auf dem Folienwickel bzw. mit der Folienbahn auf der Kontaktwalze stehen.The invention relates to a device for winding a film web onto a winding core to form a film winding, with a contact roller, via which the film web is fed to the film winding, the contact roller and the film winding running in opposite directions at the same peripheral speed, with two axially parallel to the winding core and to the contact roller rollers arranged in a film wrap, which are in pressure contact with the film web on the film winder or with the film web on the contact roller.

Eine derartige Vorrichtung zum Aufwickeln einer Folienbahn ist aus der DE-A1 37 10 412 bekannt und arbeitet beispielsweise zufriedenstellend für Wickelgeschwindigkeiten der Folienbahnen bis zu etwa 100 m/min bei sehr dünnen Folienbahnen, z.B. 3 µm-PET-Folien.Such a device for winding a film web is known from DE-A1 37 10 412 and works, for example, satisfactorily for winding speeds of the film webs up to about 100 m / min with very thin film webs, e.g. 3 µm PET films.

Bei der Herstellung von Folien kommt dem Wickeln der Folienbahn als letztem Verfahrensschritt eine erhebliche Bedeutung zu, da hierbei die spezifikationsgerechte Folienbahn derart "falsch" gewickelt werden kann, daß es zu einem Totalverlust der Folienrolle durch Beschädigungen der Folienbahn, insbesondere durch die Lagerung, kommen kann.In the production of films, the winding of the film web is of considerable importance as the last step in the process, since here the specification-compliant film web can be so "wrongly" wound that there can be a total loss of the film roll due to damage to the film web, in particular due to storage .

Ein in diesem Zusammenhang besonders wichtiges Problem stellt das Phänomen dar, daß beim Wickeln der Folienbahn erhebliche Luftmengen mit in den Folienwickel eingewickelt werden. Ein Teil dieser eingewickelten Luft entweicht während des Lagerns des Folienwickels aus diesem; hierbei können im und am Folienwickel unterschiedliche Fehler, wie Einbrüche, Verdehnungen und Querwellen, entstehen, die zur völligen Unbrauchbarkeit des Folienwickels führen können.A particularly important problem in this connection is the phenomenon that, when the film web is wound, considerable amounts of air are also wrapped in the film roll. A part of this wrapped air escapes from the film roll during storage; This can result in various errors in and on the film roll, such as dips, stretching and transverse waves, which can lead to the film roll being completely unusable.

Bei einer bekannten Vorrichtung zum Wickeln von flächenförmigen Gebilden wird mit Hilfe einer sogenannten Kontaktrolle die auf den Wickel auflaufende Folienbahn gegen den Wickel gedrückt und dadurch erreicht, daß Luft in geringeren Mengen als ohne diese Maßnahme mit eingewickelt wird. Diese Vorrichtung ist in der deutschen Patentschrift 32 65 570 (= US-PS 4,576,344) beschrieben. Die luftverdrängende Wirkung der Kontaktrolle nimmt aber mit zunehmender Wickelgeschwindigkeit ab, so daß hier ein Kompromiß eingegangen werden muß zwischen der Wickelgeschwindigkeit und dem Einwickeln von Luft. Die gesamte Phänomenologie des Lufteinwickelns unter besonderer Berücksichtigung der Abhängigkeit des Lufteinwickelns vom Kontaktrollenanpreßdruck gegen den Wickel ist Gegenstand der Forschung und Entwicklung.In a known device for winding sheet-like structures, the so-called contact roller presses the film web running onto the winding against the winding and thereby achieves that air is wrapped in smaller quantities than without this measure. This device is described in German Patent 32 65 570 (= US-PS 4,576,344). However, the air-displacing effect of the contact roll decreases with increasing winding speed, so that a compromise must be made between the winding speed and the wrapping of air. The entire phenomenology of air wrapping, with special attention to the dependence of air wrapping on the contact roller contact pressure against the winding, is the subject of research and development.

Es ist auch schon vorgeschlagen worden, den gesamten Wickelvorgang im Vakuum durchzuführen, um auf diese Weise das Problem des Lufteinwickelns zu lösen, jedoch spricht gegen eine Realisierung dieses Vorschlages der große finanzielle Aufwand.It has also been proposed to carry out the entire winding process in a vacuum in order to solve the problem of air wrapping in this way, but the great financial outlay speaks against the implementation of this proposal.

Aufgabe der Erfindung ist es, die eingangs beschriebene Vorrichtung so zu verbessern und zum Aufwickeln einer Folienbahn so weiterzuentwickeln, daß die Wickelgeschwindigkeit wesentlich erhöht werden kann und die Anwendung auch für Ultra-Dünnstfolien mit Foliendicken bis zu etwa 1 µm möglich ist.The object of the invention is to improve the device described in the introduction and to further develop it for winding up a film web in such a way that the winding speed can be increased significantly and the application is also possible for ultra-thin films with film thicknesses of up to approximately 1 μm.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Kontaktwalze eine glatte harte Oberflächenschicht aufweist, die einen Mittenrauhwert Ra kleiner 0,4 µm und eine Brinellhärte größer als 10 HB 2,5/62,5 besitzt.This object is achieved in that the contact roller has a smooth, hard surface layer which has an average roughness Ra less than 0.4 μm and a Brinell hardness greater than 10 HB 2.5 / 62.5.

Die weitere Ausgestaltung der Vorrichtung ergibt sich aus den Merkmalen der Patentansprüche 2 bis 17.The further configuration of the device results from the features of claims 2 to 17.

Mit der Erfindung wird der Vorteil erzielt, daß die Rollen zum Abquetschen der Luftgrenzschichten mit der harten glatten Oberfläche der Kontaktwalze mit bestimmter Härte und vorgegebener Mittenrauhigkeit so effektiv zusammenarbeiten, daß Ultra-Dünnstfolien mit wesentlich erhöhter Wickelgeschwindigkeit gegenüber dem bisherigen Verfahren, ohne Verluste der Härte des Wickels oder Qualitätsverlusten, beispielsweise bei der Faltenfreiheit des Wickels, aufgewickelt werden können.With the invention the advantage is achieved that the rollers for squeezing the air boundary layers with the hard smooth surface of the contact roller with certain hardness and predetermined center roughness work together so effectively that ultra-thin films with significantly increased winding speed compared to the previous method, without loss of hardness Wraps or loss of quality, for example in the wrinkle freedom of the winding, can be wound up.

Die Erfindung wird nachstehend anhand eines zeichnerisch dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

Fig. 1
eine Seitenansicht im Schnitt einer Vorrichtung gemäß der Erfindung,
Fig. 2
in Seitenansicht ein Detail der Vorrichtung nach Fig. 1,
Fig. 3
eine Ausführungsform einer geteilten Rolle für die Luftverdrängung von Folienbahnen,
Fig. 4
eine Ausführungsform einer einteiligen Luftverdrändungsrolle, und
Fig. 5
eine Ausführungsform von übereinander angeordneten Luftverdrängungsrollen, wie sie in der Vorrichtung gemäß Fig. 1 verwendet werden.
The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing. Show it:
Fig. 1
a side view in section of a device according to the invention,
Fig. 2
in side view a detail of the device of FIG. 1,
Fig. 3
one embodiment of a split roll for the air displacement of film webs,
Fig. 4
an embodiment of a one-piece air displacement roller, and
Fig. 5
an embodiment of superposed air displacement rollers, as used in the device of FIG. 1.

Eine Folienbahn 1 wird zum Aufwickeln auf einen Wickelkern 2 über eine Kontaktwalze 3 geführt, die an einem Folienwickel 8 anliegt. Der Folienwickel und die Kontaktwalze bewegen sich gegensinnig zueinander mit gleicher Umfangsgeschwindigkeit. Sowohl auf der über die Kontaktwalze zugeführten Folienbahn 1 als auch der Außenlage der Folienbahn 1 auf dem Folienwickel 8 befinden sich Luftgrenzschichten, die vor dem Zusammenführen der beiden Folienbahnen abgequetscht werden. Das Abquetschen der Luftgrenzschichten über die gesamten Folienbahnbreiten erfolgt durch mechanischen Druck. Der Abstand zwischen der Kontakt- bzw. Zusammenführungsstelle der beiden Folienbahnen und den Abquetschstellen auf den Folienbahnen, d.h. die Tiefe des Zwickels, der von dem Folienwickel und der Kontaktwalze begrenzt ist, wird möglichst klein gehalten und beträgt 13 bis 200 mm.A film web 1 is guided for winding onto a winding core 2 via a contact roller 3 which bears against a film winding 8. The film roll and the contact roller move in opposite directions to each other with the same Peripheral speed. Both on the film web 1 fed via the contact roller and on the outer layer of the film web 1 on the film roll 8 there are air boundary layers which are squeezed off before the two film webs are brought together. The air boundary layers are squeezed off over the entire width of the film web by mechanical pressure. The distance between the contact or merging point of the two film webs and the pinching points on the film webs, ie the depth of the gusset, which is limited by the film wrap and the contact roller, is kept as small as possible and is 13 to 200 mm.

In der Vorrichtung nach Figur 1 wird eine Folienbahn 1 über eine Kontaktwalze 3 geführt, läuft an einem Kontaktpunkt 7 auf einen Wickelkern 2 bzw. einen Folienwickel 8 auf und wird auf diesen aufgewickelt. Daß hierbei beachtliche Luftmengen in einem sich verjüngenden Zwickel 6 zwischen dem Folienwickel 8 und der Kontaktwalze 3 anfallen und eingewickelt werden, läßt sich dadurch erklären, daß Luftgrenzschichten 4, in Figur 1 schraffiert eingezeichnet, reibungsbedingt an jeder der Folienbahnen 1 haften und durch diese in Richtung Kontaktpunkt 7 befördert werden. Diese reibungsbedingten Luftgrenzschichten 4 existieren sowohl außen auf der Folienbahn 1, die über die Kontaktwalze 3 geführt ist, als auch auf der Umfangsfläche bzw. der Außenlage der Folienbahn 1 auf dem Folienwickel 8.In the device according to FIG. 1, a film web 1 is guided over a contact roller 3, runs onto a winding core 2 or a film winding 8 at a contact point 7 and is wound thereon. The fact that considerable amounts of air occur and are wrapped up in a tapered gusset 6 between the film winding 8 and the contact roller 3 can be explained by the fact that air boundary layers 4, shown hatched in FIG Contact point 7 are promoted. These friction-related air boundary layers 4 exist both on the outside of the film web 1, which is guided over the contact roller 3, and on the circumferential surface or the outer layer of the film web 1 on the film winding 8.

Die Kontaktwalze 3 weist eine harte, glatte Oberflächenschicht 20 auf, die einen Mittenrauhwert Ra kleiner 0,4 µm und eine Brinellhärte größer als 10 HB 2,5/62,5 besitzt. Die Brinellhärte HB wird entsprechend der Härteprüfung nach Brinell, wie sie in der DIN-Norm 50351 festgelegt ist, bestimmt. So bedeutet die Zahlenkombination 2,5/62,5, daß die Härtemessung mit einer Kugel von 2,5 mm Durchmesser ausgeführt wird, die mit einer Prüfkraft von 62,5 kp (≅ 613 N) gegen die Oberflächenschicht 20 gepreßt wird.The contact roller 3 has a hard, smooth surface layer 20 which has an average roughness Ra less than 0.4 μm and a Brinell hardness greater than 10 HB 2.5 / 62.5. The Brinell hardness HB is determined according to the Brinell hardness test as defined in the DIN standard 50351. The number combination 2.5 / 62.5 means that the hardness measurement is carried out with a ball of 2.5 mm in diameter, which is pressed against the surface layer 20 with a test force of 62.5 kp (≅ 613 N).

Die Mittenrauhigkeit wird umso kleiner gewählt, je dünner die zu wickelnde Folienbahn ist. Der Mittenrauhwert liegt im allgemeinen im Bereich 0,001 µm < Ra < 0,4 µm, vorzugsweise bei Ra≅0,03 µm, gemessen nach DIN 7162.The center roughness is chosen the smaller, the thinner the film web to be wound. The average roughness is generally in the range 0.001 μm <Ra <0.4 μm, preferably Ra ≅ 0.03 μm, measured according to DIN 7162.

Die beschriebene Vorrichtung ermöglicht das Wickeln von Ultra-Dünnstfolien, wie z.B. PET-Folien mit 2 µm Dicke, bei Geschwindigkeiten bis etwa 220 m/min.The device described enables the winding of ultra-thin films, e.g. PET films with a thickness of 2 µm, at speeds up to approximately 220 m / min.

Die Oberflächenschicht 20 kann durch Hartverchromung elektrolytisch oder chemisch aufgebracht werden. Der innere Aufbau des Walzenkörpers der Kontaktwalze 3 ist frei wählbar, solange die obigen Bedingungen für die Brinellhärte und die Rauhigkeit erfüllt sind. Typisches Beispiel einer derartigen Kontaktwalze ist eine Walze mit hartverchromter Oberflächenschicht 20; andere gebräuchliche, auf elektolytischen oder chemischem Weg aufgebrachte Oberflächenschichten sind u.a. Aluminium, Al-Mg- und/oder Al-Cu-Legierungen.The surface layer 20 can be applied electrolytically or chemically by hard chromium plating. The inner structure of the roller body of the contact roller 3 is freely selectable as long as the above conditions for the Brinell hardness and the roughness are met. A typical example of such a contact roller is a roller with a hard chromium-plated surface layer 20; other common surface layers applied by electrolytic or chemical means include aluminum, Al-Mg and / or Al-Cu alloys.

Die Oberflächenschicht 20 der Kontaktwalze 3 kann auch durch thermisches Spritzen, z.B. Plasmaspritzen von Oxiden oder Karbiden, wie Silizium-, Chromoxid oder Siliziumkarbid, aufgebracht werden.The surface layer 20 of the contact roller 3 can also be formed by thermal spraying, e.g. Plasma spraying of oxides or carbides, such as silicon, chromium oxide or silicon carbide, can be applied.

Mit Hilfe von zwei achsparallel zum Folienwickel 8 und zur Kontaktwalze 3 angeordneten Rollen 5a und 5b werden die Luftgrenzschichten 4 vor ihrem Eintritt in den Zwickel 6 von den Folienbahnen abgequetscht bzw. stark reduziert. Die luftverdrängenden Rollen 5a und 5b haben Durchmesser von 7,5 bis 50 mm und reichen dabei über die gesamte Folienbahnbreite. Der Abstand zwischen den Kontaktpunkt 7 und den Rollen 5a und 5b sollte möglichst klein sein, um die Neubildung von Luftgrenzschichten im Zwickel 6 zu vermeiden bzw. möglichst gering zu halten. Demzufolge sind die Durchmesser der Rollen 5a und 5b klein gewählt, im Vergleich zu dem Durchmesser der Kontaktwalze 3 und des Wickelkerns 2 bzw. des Folienwickels 8, wobei die Durchmesser der Rollen 5a und 5b im allgemeinen gleich groß sind, jedoch auch unterschiedlich groß sein können. Die Rollendurchmesser entsprechen dem 0,1- bis 0,5-fachen, insbesondere dem 0,15- bis 0,3-fachen des Kontaktwalzendurchmessers und dem 0,05- bis 0,3-fachen, insbesondere dem 0,1- bis 0,2-fachen des Wickelkerndurchmessers.With the aid of two rollers 5a and 5b arranged axially parallel to the film winding 8 and to the contact roller 3, the air boundary layers 4 are squeezed off or greatly reduced by the film webs before they enter the gusset 6. The air-displacing rollers 5a and 5b have diameters of 7.5 to 50 mm and extend over the entire width of the film web. The distance between the contact point 7 and the rollers 5a and 5b should be as small as possible in order to avoid the formation of air boundary layers in the gusset 6 or to keep it as small as possible. As a result, the diameters of the rollers 5a and 5b are selected to be small compared to the diameter of the contact roller 3 and the winding core 2 or the film roll 8, the diameters of the rollers 5a and 5b generally being the same size, but can also be of different sizes . The roller diameters correspond to 0.1 to 0.5 times, in particular 0.15 to 0.3 times the contact roller diameter and 0.05 to 0.3 times, in particular 0.1 to 0 , 2 times the winding core diameter.

Die Rolle 5a, die in Kontakt mit der Folienbahn 1 auf dem Folienwickel 8 steht, besitzt eine glatte harte Oberflächenschicht 21 , wie aus Fig. 3 ersichtlich ist. Für diese Oberflächenschicht 21 gelten die gleichen Bedingungen für die Brinellhärte und die Rauhigkeit, d.h. den Mittenrauhwert Ra, wie für die Oberflächenschicht 20 der Kontaktwalze 3. Ebenso stimmen das Material der Oberflächenschicht 21 sowie die Art des Aufbringens der Oberflächenschicht auf dem Rollenkörper der Rolle 5a mit dem Material und der Art des Aufbringens der Oberflächenschicht 20 auf der Kontaktwalze 3 überein. Wegen des geringen Durchmessers der Rolle 5a, im Vergleich zu der Kontaktwalze 3, kann sie auch aus vollem Material hergestellt und die Oberfläche dann entsprechend bearbeitet werden, um die voranstehend angeführten Bedingungen für die Härte und Mittenrauhigkeit zu erfüllen.The roll 5a, which is in contact with the film web 1 on the film roll 8, has a smooth, hard surface layer 21, as can be seen from FIG. 3. The same applies to this surface layer 21 Conditions for the Brinell hardness and the roughness, ie the average roughness Ra, as for the surface layer 20 of the contact roller 3. Likewise, the material of the surface layer 21 and the type of application of the surface layer on the roller body of the roller 5a match the material and the type of application the surface layer 20 on the contact roller 3. Because of the small diameter of the roller 5a compared to the contact roller 3, it can also be made of solid material and the surface can then be machined accordingly in order to meet the above-mentioned conditions for hardness and center roughness.

Die Rolle 5b, die in Kontakt mit der Folienbahn 1 auf der Kontaktwalze 3 sich befindet, besitzt eine hartelastische Oberfläche, im allgemeinen eine hartgummierte Oberfläche.The roller 5b, which is in contact with the film web 1 on the contact roller 3, has a hard elastic surface, generally a hard rubberized surface.

Die Rollen 5a und 5b können nur dann nachhaltig die Luftgrenzschichten 4 beseitigen, wenn sie mit starkem Druck gegen den auf dem Wickelkern 2 aufgerollten Folienwickel 8 bzw. gegen die über die Kontaktwalze 3 laufende Folienbahn 1 gepreßt werden. Dem dienen die Vorrichtungsteile 9 bis 16, die im folgenden beschrieben werden.The rollers 5a and 5b can only permanently remove the air boundary layers 4 if they are pressed with strong pressure against the film roll 8 rolled up on the winding core 2 or against the film web 1 running over the contact roller 3. This is served by the device parts 9 to 16, which are described below.

In bezug auf einen Kontaktrollenhalter 9 ist die an der Kontaktwalze 3 anliegende Rolle 5b während des gesaflten Wickelvorganges ortsfest angeordnet, wobei jedes ihrer Enden über je einen Winkelhebel 10 durch einen Zylinder 11 gegen die Kontaktwalze 3 gedrückt wird. Die beiden Zylinder 11 sind ihrerseits an dem Kontaktrollenhalter 9 befestigt.With respect to a contact roller holder 9, the roller 5b abutting the contact roller 3 is arranged to be stationary during the seeded winding process, each of which Each end is pressed against the contact roller 3 by a cylinder 11 via an angle lever 10. The two cylinders 11 are in turn attached to the contact roller holder 9.

Aufgrund des sich beim Wickelvorgang verändernden Wickeldurchmessers muß die am Folienwickel 8 anliegende Rolle 5a beweglich angeordnet sein. Dafür sorgen ein in einem Gelenk 13 drehbar gelagerter Zylinder 12 sowie ein in Gelenken 14 und 15 drehbarer Abstandshalter 16, die zusammen die Rolle 5a führen und mit wachsendem Wickeldurchmesser deren Verschiebung gegenüber der ortsfesten Rolle 5b ermöglichen.Due to the changing winding diameter during the winding process, the roller 5a resting on the film winding 8 must be arranged to be movable. This is ensured by a cylinder 12 which is rotatably mounted in a joint 13 and a spacer 16 which is rotatable in joints 14 and 15, which together guide the roller 5a and, with increasing winding diameter, permit its displacement relative to the stationary roller 5b.

Der Abstandshalter 16 sowie die beiden Gelenke 14 und 15, beispielsweise Kugellagergelenke, sind zusammen mit dem Zylinder 12 vergrößert in Fig. 2 dargestellt.The spacer 16 and the two joints 14 and 15, for example ball bearing joints, are shown enlarged together with the cylinder 12 in FIG. 2.

Zwar besitzen die Kontaktwalze 3 und der Folienwickel 8 und damit auch die Rollen 5a und 5b ein und dieselbe Umfangsgeschwindigkeit, doch sollte aus Gründen der Sicherheit zwischen den Rollen 5a und 5b stets ein kleiner Abstand von 0,2 bis 5,0 mm, insbesondere von 0,5 bis 1 mm, vorgesehen sein, um bei kleinen Geschwindigkeitsdifferenzen zwischen den Rollen 5a und 5b im Falle des Berührens ein Blockieren oder Stottern zu vermeiden.Although the contact roller 3 and the film roll 8 and thus also the rollers 5a and 5b have one and the same peripheral speed, for safety reasons there should always be a small distance of 0.2 to 5.0 mm, in particular of between the rollers 5a and 5b 0.5 to 1 mm, can be provided in order to avoid blocking or stuttering in the event of contact when there are small speed differences between the rollers 5a and 5b.

Die Breiten der Folienbahnen 1 betragen bis zu 1000 mm, jedoch können auch breitere Folienbahnen mit einer derartigen Vorrichtung gewickelt werden. Ist bei breiteren Folienbahnen die mechanische Stabilität der Rollen 5a und 5b bei alleiniger Aufhängung an den Rollenenden nicht mehr ausreichend, so kann anstelle einer einteiligen Rolle 5a, wie sie Fig. 3 zeigt, die über die gesamte Länge eine einheitliche Kontur bzw. gleichbleibenden Durchmesser besitzt und auf einer Achse 18 aufsitzt, auch eine aus zwei oder mehr Teilstücken 17, 17′ bestehende Rolle 5a′ (siehe Fig. 3) verwendet werden. Diese Teilstücke weisen einen einheitlichen Durchmesser auf und sitzen ebenfalls auf einer Achse 18 auf. Die mechanische Belastung der mehrteiligen Rolle kann durch Anbringen weiterer Zylinder 11 und 12 an Rollendistanzstücken 19 herabgesetzt werden.The widths of the film webs 1 are up to 1000 mm, but wider film webs can also be used with such Device can be wrapped. If, in the case of wider film webs, the mechanical stability of the rollers 5a and 5b is no longer sufficient with only suspension at the roller ends, then instead of a one-part roller 5a, as shown in FIG. 3, which has a uniform contour or constant diameter over the entire length and is seated on an axis 18, also a roller 5a 'consisting of two or more sections 17, 17' (see FIG. 3) can be used. These sections have a uniform diameter and are also seated on an axis 18. The mechanical load on the multi-part roller can be reduced by attaching further cylinders 11 and 12 to roller spacers 19.

In Fig. 3 sind die Oberflächenschichten 21 der einteiligen und der mehrteiligen Rolle 5a bzw. 5a′ schematisch dargestellt. Der mehrteilige Aufbau kann ebenso bei der Rolle 5b angewandt werden, wobei dann anstelle der Oberflächenschichten 21 hartelastische bzw. Gummischich-ten verwendet werden.In Fig. 3, the surface layers 21 of the one-part and the multi-part roller 5a and 5a 'are shown schematically. The multi-part structure can also be used for the roller 5b, in which case hard elastic or rubber layers are used instead of the surface layers 21.

Die Rollendistanzstücke 19 haben einen Durchmesser kleiner als der Rollendurchmesser der Teilstücke 17, 17′ und bilden einen ausgesparten Rollenbereich zwischen zwei benachbarten Teilstücken der mehrteiligen Rolle 5a′.The roller spacers 19 have a diameter smaller than the roller diameter of the sections 17, 17 'and form a recessed roller area between two adjacent sections of the multi-part roller 5a'.

Claims (17)

  1. An apparatus for winding up a film web onto a winding core to form a film reel, having a contact roll via which the film web is fed to the film reel, the contact roll and the film reel rotating in opposite directions at the same circumferential speed, and having two rollers arranged axially parallel to the winding core and to the contact roll in a film interstice, which rollers are in pressure contact with the film web on the film reel or with the film web on the contact roll, wherein the contact roll (3) has a smooth hard surface layer (20) which has an average peak-to-valley height Ra of less than 0.4 µm and a Brinell hardness of greater than 10 HB 2.5/62.5.
  2. The apparatus as claimed in claim 1, wherein the roller (5a) which is in contact with the film web (1) on the film reel (8) has a smooth hard surface layer (21) with an average peak-to-valley height Ra of less than 0.4 µm and a Brinell hardness of greater than 10 HB 2.5/62.5.
  3. The apparatus as claimed in claim 1, wherein the roller (5b) which is in contact with the film web (1) on the contact roll (3) has a rubber-covered surface.
  4. The apparatus as claimed in claims 1 and 2, wherein the contact roll (3) and the roller (5a) which is in contact with the film web (1) on the film reel (8) have hard chromium-plated surface layers (20; 21) or layers of electrolytically or chemically applied aluminum, Al-Mg alloys and/or Al-Cu alloys.
  5. The apparatus as claimed in claims 1 and 2, wherein the surface layers (20; 21) of the contact roll (3) and/or of the roller (5a) have been applied by thermal spraying of oxides or carbides.
  6. The apparatus as claimed in claim 1, wherein the surface layer (20) of the contact roll (3) has an average peak-to-valley height Ra in the range 0.001 µm < Ra < 0.4 µm, in particular Ra ≃ 0.03 µm.
  7. The apparatus as claimed in claim 2, wherein the roller (5a) which is in contact with the film web (1) on the film reel (8) has a surface layer (21) with an average peak-to-valley height Ra in the range 0.001 µm < Ra < 0.4 µm, in particular Ra ≃ 0.03 µm.
  8. The apparatus as claimed in claims 1 to 7, wherein the two differently coated rollers (5a) and (5b) extend over the entire width of each of the two film webs (1) and have diameters in the range from 7.5 mm to 50 mm.
  9. The apparatus as claimed in claims 1 to 8, wherein the rollers (5a) and (5b) have diameters of the same size and wherein their diameters correspond to 0.1 to 0.5 times the diameter of the contact roll (3), in particular 0.15 to 0.3 times, and 0.05 to 0.30 times the diameter of the winding core (2), in particular 0.1 to 0.2 times.
  10. The apparatus as claimed in claims 1 to 8, wherein the rollers (5a) and (5b) have different diameters.
  11. The apparatus as claimed in claims 1 to 10, wherein one roller (5a) bears against the circumferential surface of the film web (1) rolled onto the winding core (2) and the other roller (5b) bears against the film web (1) running via the contact roll (3), the rollers (5a, 5b) being connected with a contact roll holder (9).
  12. The apparatus as claimed in claims 1 to 11, wherein the distance between the rollers (5a) and (5b) and a contact point (7) between the contact roll (3) and the film reel (8) corresponds to 1 - 6 times the diameter of the rollers (5a) and (5b).
  13. The apparatus as claimed in claims 1 to 12, wherein the roller (5b) bearing on the contact roll (3) is arranged in a fixed position during the winding operation and is pressed against the contact roll (3) and is connected at each end to a cyliner (11) via an angle lever (10), and wherein the two cylinders are fastened to the contact roll holder (9).
  14. The apparatus as claimed in claims 1 to 12, wherein the roller (5a) bearing on the film reel (8) is guided and mounted movably, by being connected to a cylinder (12) which is mounted rotatably in a joint (13) on the contact roller holder (9) and wherein a spacer (16), which is mounted rotatably in joints (14) and (15) of the spindles of the rollers (5a, 5b), connects the two rollers (5a, 5b) to one another and keeps them at a distance from each other.
  15. The apparatus as claimed in claims 1 to 14, wherein the distance between the circumferences of the rollers (5a) and (5b) is in the range from 0.2 to 5.0 mm, in particular from 0.5 to 1 mm.
  16. The apparatus as claimed in claim 1, wherein each of the two differently coated rollers (5a, 5b) is of one-piece design and extends over the entire film web width.
  17. The apparatus as claimed in claim 1, wherein at least one of the two rollers (5a, 5b) consists of two or more component pieces (17, 17',...) which have the same diameter as one another, wherein the component pieces are seated on a spindle (18) and wherein a roller spacing piece (19) having a diameter smaller than the roller diameter of the component pieces is arranged between two component pieces.
EP90107063A 1989-04-21 1990-04-12 Device for winding a foil-web Expired - Lifetime EP0393519B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3913131 1989-04-21
DE3913131A DE3913131A1 (en) 1989-04-21 1989-04-21 METHOD AND DEVICE FOR WINDING A FILM COVER

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EP0393519A2 EP0393519A2 (en) 1990-10-24
EP0393519A3 EP0393519A3 (en) 1991-07-31
EP0393519B1 true EP0393519B1 (en) 1994-05-18

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EP90107063A Expired - Lifetime EP0393519B1 (en) 1989-04-21 1990-04-12 Device for winding a foil-web

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US (1) US5039023A (en)
EP (1) EP0393519B1 (en)
JP (1) JPH02305747A (en)
DE (2) DE3913131A1 (en)

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Also Published As

Publication number Publication date
EP0393519A2 (en) 1990-10-24
DE3913131C2 (en) 1991-10-17
US5039023A (en) 1991-08-13
DE3913131A1 (en) 1990-10-25
DE59005706D1 (en) 1994-06-23
EP0393519A3 (en) 1991-07-31
JPH02305747A (en) 1990-12-19

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