EP3221243B1 - Contact roll - Google Patents

Contact roll Download PDF

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Publication number
EP3221243B1
EP3221243B1 EP15798364.4A EP15798364A EP3221243B1 EP 3221243 B1 EP3221243 B1 EP 3221243B1 EP 15798364 A EP15798364 A EP 15798364A EP 3221243 B1 EP3221243 B1 EP 3221243B1
Authority
EP
European Patent Office
Prior art keywords
surface layer
segments
web
areas
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.)
Active
Application number
EP15798364.4A
Other languages
German (de)
French (fr)
Other versions
EP3221243A1 (en
Inventor
David FINNEMORE
Alexander WULFERT
Frank Hoffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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Filing date
Publication date
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Publication of EP3221243A1 publication Critical patent/EP3221243A1/en
Application granted granted Critical
Publication of EP3221243B1 publication Critical patent/EP3221243B1/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
    • 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
    • B65H18/20—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web the web roll being supported on two parallel rollers at least one of which is driven
    • 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
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/10—Materials
    • B65H2401/11—Polymer compositions
    • B65H2401/112—Fibre reinforced
    • 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
    • B65H2404/13—Details of longitudinal profile
    • B65H2404/132—Details of longitudinal profile arrangement of segments along axis
    • 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
    • B65H2404/50—Surface of the elements in contact with the forwarded or guided material
    • B65H2404/53—Surface of the elements in contact with the forwarded or guided material with particular mechanical, physical properties
    • B65H2404/532—Surface of the elements in contact with the forwarded or guided material with particular mechanical, physical properties with particular durometer
    • B65H2404/5322—Surface of the elements in contact with the forwarded or guided material with particular mechanical, physical properties with particular durometer surface with different hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/135—Surface texture; e.g. roughness

Definitions

  • the invention relates to a winding device according to the preamble of claim 1 and a method according to the preamble of claim 10.
  • a contact roller of a winding device generally has the task of pressing a material web running onto a roll against it with a defined force so that the roll has a defined winding hardness after its completion.
  • the winding hardness is determined, among other things, by the amount of air wrapped between the individual layers. This amount of air can be influenced by means of the contact roller.
  • known contact rollers comprise a surface layer and which often extends over the entire contact roller in the axial direction and in the circumferential direction.
  • these surface layers have a certain thickness - seen in the radial direction. This surface layer often comprises an elastically deformable material.
  • the U.S. 5,934,603 discloses, as the closest prior art, contact rollers, each with an elevation on both sides. An undercut is provided in between, which means that this area has a smaller radial extent than the elevations.
  • the undercuts of different exemplary embodiments are shaped differently.
  • the JP 56 017 846 discloses a winding device with a winding bed, the winding resting on two support rollers. These support rollers are thickened at their ends, ie they comprise segments there whose surface properties differ from the other areas of the surface.
  • the U.S. 3,796,361 discloses a roller of a buckle folder. This roller is comparable to the platen roller of the JP 56 017 846 .
  • the U.S. 3,796,423 likewise shows a roller of a pocket folding device with elevations in sections. The object of the present invention is therefore to avoid such an edge build-up and to form laps with as constant a lap diameter as possible over the axial extent.
  • the winding device comprises a contact roller which is characterized in that at least two axially spaced and circumferential segments are provided in which the nature of the surface layer differs from the nature of the other areas of the surface layer, these segments with the Edges of the at least one material web are in contact and that the segments of the surface layer have a greater material hardness than the remaining areas of the surface layer, the edges of the material web being able to be pressed onto the roll with a higher pressure force than the other areas of the material web.
  • “Edges” mean the two side edges of a material web that are arranged parallel to one another and, starting from this, an area which extends up to 2 cm, in particular up to 1 cm, in the direction of the center of the film. The edges are formed by trimming, at least in the area where plastic films are wound up.
  • the surface layer is not formed homogeneously, but rather comprises segments, the nature of which differs from the nature of the surface layer outside of these segments. It is advantageous if the surface layer is designed to be homogeneous outside the segments. In the area of the segments, the texture is different. According to the invention it is further provided that the edges of the material web can be contacted by the segments described, the edges being pressed onto the roll with a higher pressure than the other areas of the film. In this way it is now possible to produce a significantly more homogeneous roll and to leave the material web undamaged, as tests have already shown.
  • the contact roller can comprise more than two such segments, since several laps can also be produced simultaneously using one contact roller.
  • several panels are wound. These arise from the fact that a material web is divided into several parallel material webs while continuously cutting out narrow material web strips, which are then wound onto several reels, the reels usually being arranged in alignment on a single winding shaft. In one In such a case, it is advantageous if one of the segments described is in contact with two adjacent edges of different material webs.
  • the segments of the surface layer at least partially have a greater material hardness than the remaining areas of the surface layer.
  • Material hardness here means a property inherent in the material.
  • the segments can be made at least partially from a different material than the other areas or have been treated differently during production or subsequently.
  • the surface layer - regardless of whether a different material was selected for the segments - be brought under pretension in the area of the segments, for example by the fact that the material is pressed in from the inside in the area of the segments. The material should be pressed in so far that it leaves the linear range of the modulus of elasticity when the contact roller is pressed against the roll.
  • the restoring force of the material is greater than in the other areas, so that the edges of the material web are pressed more strongly.
  • the segments have a larger outer surface diameter than the areas of the surface layer which are adjacent to the segments.
  • the above formulation includes that in the other areas of the surface layer the contact roller does not necessarily always have the same external diameter.
  • the surface layer has different roughness on its outer surface, the roughness of the segments having a different value than the roughness of the remaining areas. It is of particular advantage if the roughness of the segments is smaller than the roughness of the other areas.
  • the outer surface of the segments is therefore smoother, which means that air cushions are created in these areas that are thicker or stronger than in the other areas. This ensures that the edge areas are pressed against the roll with greater force than the other areas.
  • the surface layer has a convex shape.
  • a cambered shape means that the surface layer and thus the entire contact roller has a smaller outer diameter at its outer edges than the other areas. When viewed from the side, the contact roller therefore has a concave shape.
  • the contact roller comprises a base body and at least one sleeve concentrically surrounding this base body, which sleeve comprises one or more layers.
  • the outermost layer comprises the surface layer.
  • the base body comprises at least one fiber-reinforced plastic.
  • the fibers can be glass fibers and / or carbon fibers.
  • the sleeve concentrically surrounding the base body can be displaced relative to it.
  • a particularly simple interchangeability of the sleeves can thus be achieved.
  • the base body can then be held at one end for the change process, while the sleeve can be pulled off or pushed on via the other, free end.
  • the base body can be mounted with a removable bearing in the winding operation, so that there is then a stable and stable mounting.
  • the base body and the sleeve can be connected to one another in a non-positive manner.
  • the non-positive connection takes place at least between parts of the outer surface of the base body and parts of the inner surface of the sleeve.
  • the inner surface of the sleeve can comprise an elastic material which is stretched by compressed air emerging from - preferably radially directed - air outlet openings of the base body. The inside diameter of the sleeve is enlarged, so that the sleeve can be pulled off and pushed on easily is made possible.
  • the base body can be equipped with expansion elements, which can be varied in their outer diameter, for example by having cavities under the outer surface that can be pressurized, such as hydraulic fluid, can be acted upon. In this way the diameter of the outer surface is enlarged at least in partial areas and the sleeve is held in a clamping manner.
  • the invention also relates to a method for winding up a material web, with at least one material web being pressed against at least one rotating roll with a contact roller, the contact roller comprising a surface layer.
  • the contact roller comprising a surface layer.
  • at least two axially spaced and circumferential segments of the contact roller in which the nature of the surface layer differs from the nature of the other areas of the surface, are in contact or in contact with the edges of the at least one material web and that the segments of the surface layer have a greater material hardness than the other areas of the surface layer, the edges of the material web being pressed against the roll with a higher pressure than the other areas of the material web .
  • Fig. 1 shows a contact roller 1 according to the invention, which presses a material web 2 running over it, preferably a plastic film web, onto a roll 3.
  • Both the contact roller 1 and the roll 3 are rotatably mounted relative to the machine frame 5 via pins and / or shafts 4.
  • the journals and / or shafts 4 of the roll 3 can also be displaceable relative to the machine frame in order to be continuously removed from the contact roller 1 as the roll diameter increases.
  • the contact roller 1 comprises two segments 6, 7, which have been provided with hatching for clarity. Subregions of these segments 6, 7 are in contact with edge regions 9, 10 of the material web 2
  • the edge region of the material web can be viewed as the region which extends up to 2 cm, preferably up to 1 cm, from the edges 11, 12 in the direction of the material web center 13.
  • the segments 6, 7 are part of the surface layer of the contact roller and differ in their properties in the most varied of ways from the remaining areas 8 (also - depending on the position - referred to as intermediate area or outer area) of the surface layer, as will be explained in more detail below with reference to further figures is explained.
  • Fig. 2 shows a compared to Figure 1 Similar embodiment, however, in the transport direction z of the material web 2 upstream of the contact roller 1, separating knives 20 are arranged, which divide the material web into several separate material webs 21, the so-called benefits, with removal of a trim strip (not shown). As a result of this procedure, the panels are each spaced apart from one another, so that they do not touch one another and thus damage one another. The number of cutting knives that can be introduced into the web path is variable, and thus also the number of separated material webs 21.
  • the individual material webs 21 are each pressed against the roll 23 by the contact roller 1, the contact roller comprises a segment 26 for each edge area of an individual material web 21, although an individual segment can also be in contact with adjacent edge areas of two material webs running directly next to one another.
  • the segments are provided and suitable for pressing the edge areas of the material web onto the roll with a greater force than the other areas of the contact roller.
  • the Fig. 3 shows a section through a contact roller 1 according to the invention.
  • the contact roller 1 comprises a roller core 31 and a surface layer 32, which in the present example covers the entire axial extension of the roller core.
  • the segments 36 are incorporated into the surface layer, which in the radial direction can also comprise individual layers of different, identical or similar materials.
  • the segments 36 each include a central segment 37 and to the right and left of it edge segments 38.
  • the outer surface 39 has a larger outer diameter than the outer surface 40 of the remaining areas 41.
  • the edge segments 38 each form a transition between the two aforementioned outer diameters, so that the radial force acting on the web of material through the contact roller does not change abruptly as a function of the axial position, but has a transition.
  • the surface layer 32 consists of several parts, the remaining areas 41 not being contiguous but being interrupted by the segments 36, which are preferably of annular design.
  • a central segment 37 and the edge segments assigned to it can be designed in one piece, but also in several pieces.
  • the outer surfaces of the edge segments, which run at an angle with respect to the axis of the contact roller, can be produced, for example, by a shaping manufacturing process. If the material of the segments is a plastic or a rubber, for example, this can be produced by means of a casting mold. Mechanical processing is also available for later shaping after the segment has been created.
  • the segments 36 can also be used as expansion tensioning elements, as shown in FIG Figure 6 be explained, designed. The advantage here is that the outside diameter can be adjusted variably.
  • the Fig. 4 now shows an alternative embodiment in which compared to FIG Figure 3 no multi-part surface layer 41 is provided. Rather is a continuous surface layer 42 is provided.
  • the segments 43 can now simply be applied to the surface layer 42. Like it in the Figure 4 As shown in more detail, the segments can also be arranged within circumferential grooves made in the surface layer 42. These grooves can be produced, for example, by machining, for example by milling.
  • the segments 43 can, in particular if they are not arranged in grooves, be displaceable in the axial direction of the contact roller relative to the surface layer.
  • the contact roller according to the invention can thus be adapted very easily to the width of the material web and / or the number of panels.
  • a further embodiment of a contact roller according to the invention is shown.
  • the segments 51 are not distinguished by geometrical configurations that differ from the other areas 52, but by different material properties, in particular with regard to the modulus of elasticity.
  • the segment 51 can again consist of a central segment 53 and edge segments 54, the central segment having a higher modulus of elasticity than that of the other areas 52.
  • the edge segments 54 advantageously have elasticity modules that lie between those of the central segment 54 and the other areas 52, to create a transition, as related to the Figure 4 has been described in relation to the different diameters.
  • the embodiment of the Figure 5 offers the great advantage that in the area of the segments, due to the greater hardness of the material, the latter provides a greater pressing force than the material of the remaining areas 52, so that the edges of the material web can be subjected to a greater force during winding, but without the outer diameter in the Area of the segments compared to that of the other areas must be larger. Nevertheless, the embodiments of Figures 3 or 4 with the embodiment of Figure 5 combine advantageously.
  • the Figure 6 shows a further, advantageous embodiment in which - viewed in the radial direction of the contact roller - at least one expansion tensioning element 63 is provided below the outer surface, advantageously at the boundary between the roller core 61 and the surface layer 62.
  • An expansion tensioning element comprises an outer surface 64 which can be changed in shape and which is in contact with the material of the surface layer.
  • the expansion tensioning element can be part of the roller core or the surface layer. It can also be designed as a separate component, which is pushed onto the roller core or applied in some other way before the surface layer is applied.
  • the expansion tensioning element is advantageously designed in the form of a ring, so that a rotational symmetry results, which causes a uniform influence on the surface layer - seen in the circumferential direction.
  • the expansion tensioning element includes a cavity 65 to which a pressurized fluid can be applied.
  • This fluid can be a gas, a liquid or some other flowable or pourable material.
  • An incompressible fluid such as a so-called hydraulic fluid, is particularly advantageous here.
  • a line 66 for example in the form of a tube, can be provided.
  • a closure is provided which is displaceable relative to the line.
  • the closure can be a screw that is rotated relative to an internal thread of the line 66.
  • the outer surface With increasing pressure - as described - the outer surface is moved outwards.
  • the material of the segment is compressed and / or also moved further outwards.
  • the material is pretensioned so that the contact roller 1 with these segments can apply an increased force to the edge areas of the material web. This also applies if, as in the second case, the outer diameter of the segment is also increased.
  • the materials can advantageously have a greater, the same or even a smaller modulus of elasticity than the material of the other regions.
  • the segments 76 are designed to be gas-permeable.
  • the segments 76 can be provided with through holes, for example bores.
  • at least parts of the segments can also consist of porous, preferably microporous material. The material preferably has pore sizes in the range from 10 to 100 micrometers.
  • a circumferential gas channel 73 which is connected to gas lines 74 can be provided on the inside of the surface layer. These gas lines 74 lead to the outside via a rotary leadthrough 75, where the gas lines are connected to a gas supply.
  • the gas supply is also preferably set up and designed so that there is a pressure difference in the range from 20 mbar to 1 bar between the gas and the environment. Compressed air is preferably used as the gas.
  • the gas now passes through the segments to the outer surface, where an air film is formed between the segments and the edges of the material web, so that there is a higher pressing force in the area of the material web edges compared to the other areas.
  • the Figure 8 shows an embodiment of the invention that is independent of the specific configuration of the segments, in which the Surface layer comprehensive sleeve 82 is displaceable along the arrow 83 relative to the contact roller core. This serves to replace the sleeve 82 with another one which has, for example, a different configuration and / or a different arrangement of the segments, so that the contact roller can be adapted to the requirements with regard to the components of the material web and / or their dimensions. Further details on the design of this variant of the invention have already been given above in the introductory description.
  • the Figure 9 shows a contact roller 91 according to the invention, which can be used for the different widths of the material web.
  • the contact roller 91 comprises different segments 92 which are arranged at different distances from one another.
  • One area of application for this as well as for all other exemplary embodiments according to the invention is the formation of wraps with so-called stretch film, which was produced in particular using the cast film process (more here later).
  • a stretch film is characterized by the fact that it comprises one of the following material combinations: PE-LD, PE-LLD, mPE-LLD, PP.
  • PE means polyethylene
  • LD means low density
  • LLD means linear low density
  • mPE means polyethylene made with metallocene catalysts
  • PP means polypropylene.
  • the film thicknesses are up to 50 micrometers, in particular up to 30 micrometers.
  • the extensibility (changes in length in one direction) of these films is at least 150%, in particular at least 250%.
  • the surfaces of these stretch films are strongly adhesive to sticky.
  • Such stretch films are usually wound into rolls with a width of 50 cm, but also into rolls with a width of 25 cm, since these are standard widths which are matched to various automatic packaging machines. Of course, other, in particular larger, web widths are also possible, such as 45 cm, 75 cm and 100 cm.
  • the segments of the contact roller are now distributed in such a way that they - apart from single-use laps - can also form two-use laps 93.
  • four benefits 94 can also be formed without having to replace the contact roller, further segments 94 being provided which However, even when two panels are formed, they can remain on the contact roller, since they have no - neither positive nor negative - influence on the roll.
  • Further segments can be provided in order to be able to process further widths and / or numbers of uses.
  • the Figure 10 now schematically represents the essential elements of a cast film system 100, as it can preferably be used for producing the stretch films already described above.
  • the nozzle head 101 is acted upon by — usually several different — plasticized plastic flows via extruders, which are not shown. After these plastic streams have been brought together and distributed across the width, which is the task of the nozzle head, the melt emerges from the latter and is applied as a melt curtain to the cooling roller 102, which rotates in the direction of arrow 103. After a certain dwell time, the plastic compound, which has meanwhile cooled down and is therefore now forming a film web 104, is removed from the cooling roller 102 by means of the roller 105.
  • the film web 104 is now fed to the winding device 107 via further rollers 106.
  • this winding device there is a contact roller 1 according to the invention, over which the film web 104 is guided and with which it is pressed against the roll 108 and wound onto it.

Landscapes

  • Winding Of Webs (AREA)

Description

Die Erfindung betrifft eine Wickelvorrichtung nach dem Oberbegriff des Anspruchs 1 und ein Verfahren nach dem Oberbegriff des Anspruchs 10.The invention relates to a winding device according to the preamble of claim 1 and a method according to the preamble of claim 10.

Eine Kontaktwalze einer Wickelvorrichtung hat in der Regel die Aufgabe, eine auf einen Wickel auflaufende Materialbahn an diesen mit einer definierten Kraft anzudrücken, so dass der Wickel nach seiner Fertigstellung eine definierte Wickelhärte aufweist. Die Wickelhärte ist dabei unter anderem durch die Menge der zwischen den einzelnen Lagen eingewickelten Luft bestimmt. Mittels der Kontaktwalze kann diese Luftmenge beeinflusst werden. Bekannte Kontaktwalzen umfassen dazu eine Oberflächenschicht und die sich in axialer Richtung und in Umfangsrichtung oft über die gesamte Kontaktwalze erstreckt. Darüber hinaus weisen diese Oberflächenschichten eine - in radialer Richtung gesehen - gewisse Dicke auf. Oft umfasst diese Oberflächenschicht ein elastisch verformbares Material.A contact roller of a winding device generally has the task of pressing a material web running onto a roll against it with a defined force so that the roll has a defined winding hardness after its completion. The winding hardness is determined, among other things, by the amount of air wrapped between the individual layers. This amount of air can be influenced by means of the contact roller. For this purpose, known contact rollers comprise a surface layer and which often extends over the entire contact roller in the axial direction and in the circumferential direction. In addition, these surface layers have a certain thickness - seen in the radial direction. This surface layer often comprises an elastically deformable material.

Als nachteilig erweist sich allerdings, dass es trotz der Verwendung solcher Kontaktwalzen zu unterschiedlichen Durchmessern des Wickels an verschiedenen axialen Positionen des Wickels kommt. Insbesondere bei zunehmendem Wickeldurchmesser wird die Materialbahn an solchen Stellen mechanisch belastet, was zu veränderten Eigenschaften dieser Materialbahn an diesen Stellen führen kann. Ist die Materialbahn beispielsweise eine Kunststoffbahn, so wird diese an solchen Stellen gedehnt, was zu einer schlechteren Bedruckbarkeit führen kann. Besonders ausgeprägt sind solche Stellen an den seitlichen Kanten beziehungsweise Rändern der Materialbahnen. Hier ist oft ein so genannter Kantenaufbau zu beobachten, da Materialbahnen im Bereich ihrer Kanten im Vergleich zu den inneren bzw. mittleren Bereichen Inhomogenitäten aufweisen.However, it has proven to be disadvantageous that, despite the use of such contact rollers, different diameters of the roll occur at different axial positions of the roll. In particular with increasing winding diameter, the material web is mechanically stressed at such points, which can lead to changed properties of this material web at these points. If the material web is, for example, a plastic web, it is stretched at such points, which can lead to poor printability. Such points are particularly pronounced on the lateral edges or edges of the Material webs. A so-called edge build-up can often be observed here, since material webs have inhomogeneities in the area of their edges compared to the inner or central areas.

Die US 5 934 603 offenbart als nächstliegenden Stand der Technik Kontaktwalzen mit jeweils einer Erhöhung an beiden Seiten. Dazwischen ist ein Hinterschnitt vorgesehen, der dazu führt, dass dieser Bereich eine geringere radiale Ausdehnung hat als die Erhöhungen. Die Hinterschnitte verschiedener Ausführungsbeispiele sind unterschiedlich ausgeformt.The U.S. 5,934,603 discloses, as the closest prior art, contact rollers, each with an elevation on both sides. An undercut is provided in between, which means that this area has a smaller radial extent than the elevations. The undercuts of different exemplary embodiments are shaped differently.

Die JP 56 017 846 offenbart eine Wickelvorrichtung mit Wickelbett, wobei der Wickel auf zwei Auflagewalzen aufliegt. Diese Auflagewalzen sind an ihren Enden verdickt, d.h. sie umfassen dort Segmente, deren Oberflächenbeschaffenheit von den übrigen Bereichen der Oberfläche unterscheidet.
Die US 3 796 361 offenbart eine Walze einer Taschenfalzeinrichtung. Diese Walze ist vergleichbar mit der Auflagewalze der JP 56 017 846 . Die US 3 796 423 zeigt ebenfalls eine Walze einer Taschenfalzeinrichtung mit abschnittweisen Erhöhungen.
Die Aufgabe der vorliegenden Erfindung ist es daher, einen solchen Kantenaufbau zu vermeiden und Wickel mit möglichst konstantem Wickeldurchmesser über die axiale Erstreckung zu bilden.The JP 56 017 846 discloses a winding device with a winding bed, the winding resting on two support rollers. These support rollers are thickened at their ends, ie they comprise segments there whose surface properties differ from the other areas of the surface.
The U.S. 3,796,361 discloses a roller of a buckle folder. This roller is comparable to the platen roller of the JP 56 017 846 . The U.S. 3,796,423 likewise shows a roller of a pocket folding device with elevations in sections.
The object of the present invention is therefore to avoid such an edge build-up and to form laps with as constant a lap diameter as possible over the axial extent.

Erfindungsgemäß wird diese Aufgabe durch sämtliche Merkmale des Anspruchs 1 gelöst. In den abhängigen Ansprüchen sind mögliche Ausgestaltungen der Erfindung angegeben.
Die erfindungsgemäße Wickelvorrichtung umfasst eine Kontaktwalze, die sich dadurch auszeichnet, dass zumindest zwei in axialer Richtung beabstandete und in Umfangsrichtung umlaufende Segmente vorgesehen sind, in denen sich die Beschaffenheit der Oberflächenschicht von der Beschaffenheit der übrigen Bereiche der Oberflächenschicht unterscheidet, wobei diese Segmente mit den Rändern der zumindest einen Materialbahn in Kontakt stehen und dass die Segmente der Oberflächenschicht eine größere Materialhärte aufweisen als die übrigen Bereiche der Oberflächenschicht, wobei die Ränder der Materialbahn mit einer höheren Andruckkraft an den Wickel andrückbar sind als die anderen Bereiche der Materialbahn.According to the invention, this object is achieved by all of the features of claim 1. Possible embodiments of the invention are specified in the dependent claims.
The winding device according to the invention comprises a contact roller which is characterized in that at least two axially spaced and circumferential segments are provided in which the nature of the surface layer differs from the nature of the other areas of the surface layer, these segments with the Edges of the at least one material web are in contact and that the segments of the surface layer have a greater material hardness than the remaining areas of the surface layer, the edges of the material web being able to be pressed onto the roll with a higher pressure force than the other areas of the material web.

Mit "Ränder" sind dabei die beiden parallel zueinander angeordneten Seitenränder einer Materialbahn gemeint sowie hiervon ausgehend ein Bereich, der sich bis zu 2 cm, insbesondere bis zu 1 cm in Richtung der Folienmitte erstreckt. Zumindest im Bereich der Aufwicklung von Kunststofffolien werden die Ränder durch Besäumen gebildet."Edges" mean the two side edges of a material web that are arranged parallel to one another and, starting from this, an area which extends up to 2 cm, in particular up to 1 cm, in the direction of the center of the film. The edges are formed by trimming, at least in the area where plastic films are wound up.

Gemäß der vorliegenden Erfindung ist nun vorgesehen, dass die Oberflächenschicht nicht homogen ausgebildet ist, sondern Segmente umfasst, deren Beschaffenheit sich von der Beschaffenheit der Oberflächen schicht außerhalb dieser Segmente unterscheidet. Vorteilhaft ist dabei, wenn die Oberflächenschicht außerhalb der Segmente homogen ausgestaltet ist. Im Bereich der Segmente ist die Beschaffenheit eine andere.
Erfindungsgemäß ist weiterhin vorgesehen, dass die Ränder der Materialbahn von den beschriebenen Segmenten kontaktierbar sind, wobei die Ränder mit einer höheren Andruckkraft an den Wickel gedrückt werden als die anderen Bereiche der Folie. Auf diese Weise gelingt es nun, einen deutlich homogeneren Wickel zu erzeugen und die Materialbahn unbeschädigt zu lassen, wie Versuche bereits gezeigt haben.According to the present invention it is now provided that the surface layer is not formed homogeneously, but rather comprises segments, the nature of which differs from the nature of the surface layer outside of these segments. It is advantageous if the surface layer is designed to be homogeneous outside the segments. In the area of the segments, the texture is different.
According to the invention it is further provided that the edges of the material web can be contacted by the segments described, the edges being pressed onto the roll with a higher pressure than the other areas of the film. In this way it is now possible to produce a significantly more homogeneous roll and to leave the material web undamaged, as tests have already shown.

Die Kontaktwalze kann dabei mehr als zwei solcher Segmente umfassen, da unter Verwendung einer Kontaktwalze auch gleichzeitig mehrere Wickel hergestellt werden können. Gemäß der Fachsprache im Bereich der Wickeltechnik werden mehrere Nutzen gewickelt. Diese entstehen dadurch, dass eine Materialbahn unter laufendem Heraustrennen von schmalen Materialbahnstreifen in mehrere parallel laufende Materialbahnen aufgeteilt wird, welche dann auf mehrere Wickel aufgewickelt werden, wobei die Wickel in der Regel fluchtend auf einer einzigen Wickelwelle angeordnet sind. In einem solchen Fall ist es vorteilhaft, wenn eines der beschriebenen Segmente mit zwei benachbarten Rändern unterschiedlicher Materialbahnen in Kontakt steht.The contact roller can comprise more than two such segments, since several laps can also be produced simultaneously using one contact roller. According to the technical terminology in the field of winding technology, several panels are wound. These arise from the fact that a material web is divided into several parallel material webs while continuously cutting out narrow material web strips, which are then wound onto several reels, the reels usually being arranged in alignment on a single winding shaft. In one In such a case, it is advantageous if one of the segments described is in contact with two adjacent edges of different material webs.

Gemäß der Erfindung ist es vorgesehen, dass die Segmente der Oberflächenschicht zumindest teilweise eine größere Materialhärte aufweisen als die übrigen Bereiche der Oberflächenschicht. Mit Materialhärte ist hier eine dem Material innewohnende Eigenschaft gemeint. Dabei können die Segmente zumindest teilweise aus einem anderen Material gefertigt sind als die übrigen Bereiche oder bei der Herstellung oder nachträglich anders behandelt worden sein. Insbesondere wenn es sich um elastische Materialien handelt, ist es vorteilhaft, Segmente aus einem Material vorzusehen, das einen größeren Elastizitätsmodul als das Material der übrigen Bereiche aufweist. Alternativ oder zusätzlich kann die Oberflächenschicht - unabhängig davon, ob für die Segmente ein anderes Material gewählt wurde - im Bereich der Segmente unter Vorspannung gebracht werden, beispielsweise dadurch, dass das Material im Bereich der Segmente von innen her eingedrückt wird. Dabei sollte das Material soweit eingedrückt werden, dass es den linearen Bereich des Elastizitätsmoduls verlässt, wenn die Kontaktwalze an den Wickel angedrückt wird.According to the invention it is provided that the segments of the surface layer at least partially have a greater material hardness than the remaining areas of the surface layer. Material hardness here means a property inherent in the material. The segments can be made at least partially from a different material than the other areas or have been treated differently during production or subsequently. In particular when it comes to elastic materials, it is advantageous to provide segments made of a material which has a greater modulus of elasticity than the material of the other areas. Alternatively or additionally, the surface layer - regardless of whether a different material was selected for the segments - be brought under pretension in the area of the segments, for example by the fact that the material is pressed in from the inside in the area of the segments. The material should be pressed in so far that it leaves the linear range of the modulus of elasticity when the contact roller is pressed against the roll.

Wird eine wie oben beschrieben ausgestaltete Kontaktwalze an den Wickel angestellt, so wird die elastische Oberflächenschicht der Kontaktwalze gemäß dem Aktio = Reaktio-Grundsatzes an der Kontaktfläche eingedrückt. Im Bereich der Segmente ist dabei dann die Rückstellkraft des Materials größer als in den übrigen Bereichen, so dass die Ränder der Materialbahn stärker angedrückt werden.If a contact roller configured as described above is placed on the roll, the elastic surface layer of the contact roller is pressed in on the contact surface in accordance with the principle of action = reaction. In the area of the segments, the restoring force of the material is greater than in the other areas, so that the edges of the material web are pressed more strongly.

In einer anderen Vorteile bietenden Ausführungsform, die auch in Kombination mit der vorgenannten ersten Ausführungsform Vorteile bringen kann, ist vorgesehen, dass die Segmente einen größeren Außenoberflächendurchmesser aufweisen als die Bereiche der Oberflächenschicht, die zu den Segmenten benachbart sind. Die vorstehende Formulierung schließt ein, dass in den übrigen Bereichen der Oberflächenschicht die Kontaktwalze nicht zwangsläufig stets den gleichen Außendurchmesser aufweist.In another embodiment offering advantages, which can also bring advantages in combination with the aforementioned first embodiment, it is provided that the segments have a larger outer surface diameter than the areas of the surface layer which are adjacent to the segments. The above formulation includes that in the other areas of the surface layer the contact roller does not necessarily always have the same external diameter.

In einer weiteren Vorteile bringenden Ausführungsform der Erfindung ist vorgesehen, dass die Oberflächenschicht unterschiedliche Rauigkeiten an ihrer Außenoberfläche aufweist, wobei die Rauigkeit der Segmente einen anderen Wert hat als die Rauigkeit der übrigen Bereiche. Von besonderem Vorteil ist es, wenn die Rauigkeit der Segmente kleiner ist als die Rauigkeit der übrigen Bereiche. Die Außenoberfläche der Segmente ist also glatter, was mit sich bringt, dass in diesen Bereichen Luftpolster entstehen, die dicker bzw. stärker sind als in den übrigen Bereichen. Damit wird erreicht, dass die Randbereiche mit stärkerer Kraft an den Wickel gedrückt werden als die anderen Bereiche.In a further advantageous embodiment of the invention it is provided that the surface layer has different roughness on its outer surface, the roughness of the segments having a different value than the roughness of the remaining areas. It is of particular advantage if the roughness of the segments is smaller than the roughness of the other areas. The outer surface of the segments is therefore smoother, which means that air cushions are created in these areas that are thicker or stronger than in the other areas. This ensures that the edge areas are pressed against the roll with greater force than the other areas.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, dass die Oberflächenschicht eine bombierte Form aufweist. Mit einer bombierten Form ist gemeint, dass die Oberflächenschicht und damit die gesamte Kontaktwalze an ihren Außenkanten einen kleineren Außendurchmesser hat als die übrigen Bereiche. Von der Seite betrachtet hat die Kontaktwalze demnach eine konkave Form.In a further advantageous embodiment of the invention it is provided that the surface layer has a convex shape. A cambered shape means that the surface layer and thus the entire contact roller has a smaller outer diameter at its outer edges than the other areas. When viewed from the side, the contact roller therefore has a concave shape.

In einer empfehlenswerten Weiterbildung der Erfindung ist vorgesehen, dass die Kontaktwalze einen Grundkörper sowie zumindest eine diesen Grundkörper konzentrisch umgebende Hülse umfasst, welche eine oder mehrere Schichten umfasst. Die äußerste Schicht umfasst dabei die Oberflächenschicht. Der große Vorteil in diesem Aufbau der Kontaktwalze ist darin zu sehen, dass die Hülse auswechselbar ausgestaltet ist. Damit ist die Kontaktwalze an die zu wickelnde Materialbahn anpassbar, ohne dass man hierfür jeweils eigens eine Kontaktwalze vorhalten muss. Beispielsweise kann für jede Anzahl an Nutzen eine eigene Hülse mit der korrespondierenden Anzahl an Segmenten vorhalten. Je nach Materialbahnart können beispielsweise Hülsen vorgesehen sein, die die Ränder mit unterschiedlichen Kräften beaufschlagen.In a recommendable development of the invention it is provided that the contact roller comprises a base body and at least one sleeve concentrically surrounding this base body, which sleeve comprises one or more layers. The outermost layer comprises the surface layer. The great advantage of this design of the contact roller is that the sleeve is designed to be exchangeable. This means that the contact roller can be adapted to the material web to be wound without having to keep a separate contact roller for this. For example, a separate sleeve with the corresponding number of segments can be kept for each number of panels. Depending on the type of material web, sleeves can be provided, for example, which act on the edges with different forces.

Vorteilhaft ist es, wenn der Grundkörper wenigstens einen faserverstärkten Kunststoff umfasst. Die Fasern können dabei Glasfasern und/oder Carbonfasern sein.It is advantageous if the base body comprises at least one fiber-reinforced plastic. The fibers can be glass fibers and / or carbon fibers.

Besonders vorteilhaft ist es, wenn die den Grundkörper konzentrisch umgebende Hülse relativ zu diesem verschiebbar ist. Damit ist eine besonders einfache Auswechselbarkeit der Hülsen realisierbar. Der Grundkörper kann dann zum Wechselvorgang einendig gehalten werden, während die Hülse über das andere, freie Ende abgezogen beziehungsweise aufgeschoben werden kann. Der Grundkörper kann dabei mit einem entfernbaren Lager im Wickelbetrieb gelagert sein, so dass es dann eine beidendige und damit stabile Lagerung gibt.It is particularly advantageous if the sleeve concentrically surrounding the base body can be displaced relative to it. A particularly simple interchangeability of the sleeves can thus be achieved. The base body can then be held at one end for the change process, while the sleeve can be pulled off or pushed on via the other, free end. The base body can be mounted with a removable bearing in the winding operation, so that there is then a stable and stable mounting.

Weiterhin ist es vorteilhaft, wenn der Grundkörper und die Hülse kraftschlüssig miteinander verbindbar sind. Insbesondere ist dabei vorgesehen, dass die kraftschlüssige Verbindung zumindest zwischen Teilen der Außenoberfläche des Grundkörpers und Teilen der Innenoberfläche der Hülse erfolgt. Dabei gibt es verschiedene Ausführungsmöglichkeiten. Die Innenoberfläche der Hülse kann ein elastisches Material umfassen, welches durch aus - vorzugsweise radial gerichteten - Luftaustrittsöffnungen des Grundkörpers austretender Druckluft gedehnt wird. Der Innendurchmesser der Hülse wird dadurch vergrößert, so dass ein leichtgängiges Abziehen und Aufschieben der Hülse ermöglicht ist. In einer alternativen oder auch ergänzenden Ausführungsform kann der Grundkörper mit Dehnelementen ausgestattet sein, welche sich in ihrem Außendurchmesser variieren lassen, beispielsweise indem Hohlräume unter der Außenoberfläche mit einem unter Druck setzbaren Fluid, etwa Hydraulikflüssigkeit, beaufschlagbar sind. Damit wird der Durchmesser der Außenoberfläche zumindest in Teilbereichen vergrößert und die Hülse klemmend gehalten.It is also advantageous if the base body and the sleeve can be connected to one another in a non-positive manner. In particular, it is provided that the non-positive connection takes place at least between parts of the outer surface of the base body and parts of the inner surface of the sleeve. There are different design options. The inner surface of the sleeve can comprise an elastic material which is stretched by compressed air emerging from - preferably radially directed - air outlet openings of the base body. The inside diameter of the sleeve is enlarged, so that the sleeve can be pulled off and pushed on easily is made possible. In an alternative or complementary embodiment, the base body can be equipped with expansion elements, which can be varied in their outer diameter, for example by having cavities under the outer surface that can be pressurized, such as hydraulic fluid, can be acted upon. In this way the diameter of the outer surface is enlarged at least in partial areas and the sleeve is held in a clamping manner.

Ebenfalls Gegenstand der Erfindung ist ein Verfahren zum Aufwickeln einer Materialbahn, wobei mit einer Kontaktwalze zumindest eine Materialbahn an wenigstens einen sich drehenden Wickel angedrückt wird, wobei die Kontaktwalze eine Oberflächenschicht umfasst. Erfindungsgemäß ist dabei vorgesehen, dass zumindest zwei in axialer Richtung beabstandete und in Umfangsrichtung umlaufende Segmente der Kontaktwalze, in denen sich die Beschaffenheit der Oberflächenschicht von der Beschaffenheit der übrigen Bereiche der Oberfläche unterscheidet, mit den Rändern der zumindest einen Materialbahn in Kontakt stehen oder in Kontakt gebracht werden und dass die Segmente der Oberflächenschicht eine größere Materialhärte aufweisen als die übrigen Bereiche der Oberflächenschicht, wobei die Ränder der Materialbahn mit einer höheren Andruckkraft an den Wickel angedrückt werden als die anderen Bereiche der Materialbahn..The invention also relates to a method for winding up a material web, with at least one material web being pressed against at least one rotating roll with a contact roller, the contact roller comprising a surface layer. According to the invention it is provided that at least two axially spaced and circumferential segments of the contact roller, in which the nature of the surface layer differs from the nature of the other areas of the surface, are in contact or in contact with the edges of the at least one material web and that the segments of the surface layer have a greater material hardness than the other areas of the surface layer, the edges of the material web being pressed against the roll with a higher pressure than the other areas of the material web ..

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung gehen aus der nachfolgenden Beschreibung hervor, in der unter Bezugnahme auf die Figuren verschiedene Ausführungsbeispiele im Einzelnen erläutert sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder beliebige Kombinationen erwähnter Merkmale erfindungswesentlich sein. Im Rahmen der gesamten Offenbarung gelten Merkmale und Einzelheiten, die im Zusammenhang mit der Erfindung stets wechselseitig Bezug genommen wird beziehungsweise werden kann. Die einzelnen Figuren zeigen:

Fig. 1
Eine Kontaktwalze, die eine Materialbahn an einen Wickel andrückt
Fig. 2
Eine Kontaktwalze, die eine in mehrere Nutzen aufgeteilte Materialbahn an Wickel andrückt
Fig. 3
Einen Schnitt durch eine erfindungsgemäße Kontaktwalze, bei der die Segmente erhöht sind
Fig. 4
Einen Schnitt durch eine weitere erfindungsgemäße Kontaktwalze, bei der die Segmente erhöht sind
Fig. 5
Einen Schnitt durch eine erfindungsgemäße Kontaktwalze, bei der die Segmente einen anderen Elastizitätsmodul aufweisen
Fig. 6
Einen Schnitt durch eine erfindungsgemäße Kontaktwalze, bei der die Segmente mit einem Dehnspannelement beaufschlagbar sind,
Fig. 7
Einen Schnitt durch eine erfindungsgemäße Kontaktwalze, bei der die Segmente gasdurchlässig sind
Fig. 8
Einen Schnitt durch eine erfindungsgemäße Kontaktwalze mit einer austauschbaren Hülse
Fig. 9
Eine erfindungsgemäße Kontaktwalze, die für das verschiedene Breiten der Materialbahn einsetzbar ist
Fig. 10
Eine Gießfolienextrusionsvorrichtung mit einer Wickelvorrichtung, die eine erfindungsgemäße Kontaktwalze umfasst.
Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are explained in detail with reference to the figures. The features mentioned in the claims and in the description can in each case be essential to the invention individually or in any combination of the features mentioned. In the context of the entire disclosure, features and details apply in connection with the Invention is always referred to alternately or can be. The individual figures show:
Fig. 1
A contact roller that presses a web of material against a roll
Fig. 2
A contact roller that presses a web of material divided into several panels onto the roll
Fig. 3
A section through a contact roller according to the invention, in which the segments are raised
Fig. 4
A section through a further contact roller according to the invention, in which the segments are raised
Fig. 5
A section through a contact roller according to the invention, in which the segments have a different modulus of elasticity
Fig. 6
A section through a contact roller according to the invention, in which the segments can be acted upon by an expansion clamping element,
Fig. 7
A section through a contact roller according to the invention, in which the segments are gas-permeable
Fig. 8
A section through a contact roller according to the invention with an exchangeable sleeve
Fig. 9
A contact roller according to the invention which can be used for the different widths of the material web
Fig. 10
A cast film extrusion device with a winding device which comprises a contact roller according to the invention.

Fig. 1 zeigt eine erfindungsgemäße Kontaktwalze 1, welche eine über sie laufende Materialbahn 2, vorzugsweise eine Kunststofffolienbahn, an einen Wickel 3 andrückt. Sowohl die Kontaktwalze 1 wie auch der Wickel 3 sind über Zapfen und/oder Wellen 4 relativ zum Maschinengestell 5 drehbar gelagert. Die Zapfen und/oder Wellen 4 des Wickels 3 können zudem relativ zu dem Maschinengestell verschiebbar sein, um mit wachsendem Wickeldurchmesser stetig von der Kontaktwalze 1 entfernt zu werden. Fig. 1 shows a contact roller 1 according to the invention, which presses a material web 2 running over it, preferably a plastic film web, onto a roll 3. Both the contact roller 1 and the roll 3 are rotatably mounted relative to the machine frame 5 via pins and / or shafts 4. The journals and / or shafts 4 of the roll 3 can also be displaceable relative to the machine frame in order to be continuously removed from the contact roller 1 as the roll diameter increases.

Die Kontaktwalze 1 umfasst zwei Segmente 6, 7, die zur Verdeutlichung mit einer Schraffur versehen worden sind. Teilbereiche dieser Segmente 6, 7 stehen im Kontakt mit Randbereichen 9, 10 der Materialbahn 2. Als Randbereich der Materialbahn kann der Bereich angesehen werden, der sich bis zu 2 cm, vorzugsweise bis zu 1 cm von den Rändern 11, 12 in Richtung der Materialbahnmitte 13 hin erstreckt.The contact roller 1 comprises two segments 6, 7, which have been provided with hatching for clarity. Subregions of these segments 6, 7 are in contact with edge regions 9, 10 of the material web 2 The edge region of the material web can be viewed as the region which extends up to 2 cm, preferably up to 1 cm, from the edges 11, 12 in the direction of the material web center 13.

Die Segmente 6, 7 sind Bestandteil der Oberflächenschicht der Kontaktwalze und unterscheiden sich in ihrer Beschaffenheit auf unterschiedlichste Weise von den übrigen Bereichen 8 (auch - je nach Position - als Zwischenbereich oder Außenbereich bezeichnet) der Oberflächenschicht, wie es im Folgenden anhand von weiteren Figuren näher erläutert wird.The segments 6, 7 are part of the surface layer of the contact roller and differ in their properties in the most varied of ways from the remaining areas 8 (also - depending on the position - referred to as intermediate area or outer area) of the surface layer, as will be explained in more detail below with reference to further figures is explained.

Die Fig. 2 zeigt ein im Vergleich zur Figur 1 ähnliches Ausführungsbeispiel, wobei jedoch in Transportrichtung z der Materialbahn 2 stromaufwärts der Kontaktwalze 1 Trennmesser 20 angeordnet sind, die die Materialbahn unter Abführung jeweils eines Beschnittstreifens (nicht näher dargestellt) in mehrere separate Materialbahnen 21, den so genannten Nutzen, aufteilt. Durch diese Vorgehensweise sind die Nutzen jeweils voneinander beabstandet, so dass diese sich nicht gegenseitig berühren und damit beschädigen. Die Anzahl der Trennmesser, die in den Bahnweg eingebracht werden können, ist variabel und damit auch die Anzahl der vereinzelten Materialbahnen 21.The Fig. 2 shows a compared to Figure 1 Similar embodiment, however, in the transport direction z of the material web 2 upstream of the contact roller 1, separating knives 20 are arranged, which divide the material web into several separate material webs 21, the so-called benefits, with removal of a trim strip (not shown). As a result of this procedure, the panels are each spaced apart from one another, so that they do not touch one another and thus damage one another. The number of cutting knives that can be introduced into the web path is variable, and thus also the number of separated material webs 21.

Diese einzelnen Materialbahnen 21 werden jeweils auf einen eigenen Wickel 23 aufgewickelt, wobei die Wickel 23 vorzugsweise auf der gemeinsamen Wickelwelle 24 aufgespannt sind. Für die Wickelwelle 24 gelten die gleichen Eigenschaften wie für die im Zusammenhang mit der Figur 1 erläuterten Zapfen und/oder Wellen 4.These individual webs of material 21 are each wound onto their own reel 23, the reels 23 preferably being stretched on the common winding shaft 24. For the winding shaft 24, the same properties apply as for those in connection with the Figure 1 illustrated journals and / or shafts 4.

Die einzelnen Materialbahnen 21 werden durch die Kontaktwalze 1 jeweils an den Wickel 23 angedrückt, die Kontaktwalze für jeden Randbereich einer einzelnen Materialbahn 21 ein Segment 26 umfasst, wobei jedoch ein einzelnes Segment auch mit benachbarten Randbereichen zwei direkt nebeneinander laufender Materialbahnen in Kontakt stehen kann.The individual material webs 21 are each pressed against the roll 23 by the contact roller 1, the contact roller comprises a segment 26 for each edge area of an individual material web 21, although an individual segment can also be in contact with adjacent edge areas of two material webs running directly next to one another.

Die Segmente sind dazu vorgesehen und geeignet, die Randbereiche der Materialbahn mit einer größeren Kraft an den Wickel anzudrücken als die übrigen Bereiche der Kontaktwalze.The segments are provided and suitable for pressing the edge areas of the material web onto the roll with a greater force than the other areas of the contact roller.

Die Fig. 3 zeigt einen Schnitt durch eine erfindungsgemäße Kontaktwalze 1. Die Kontaktwalze 1 umfasst dabei einen Walzenkern 31 und eine Oberflächenschicht 32, die im vorliegenden Beispiel die gesamte axiale Erstreckung des Walzenkerns abdeckt. In die Oberflächenschicht, die in radialer Richtung auch einzelne Lagen unterschiedlicher, gleicher oder gleichartiger Materialien umfassen kann, sind die Segmente 36 eingearbeitet. Die Segmente 36 umfassen dabei jeweils ein Zentralsegment 37 und rechts und links davon Randsegmente 38. Die Außenoberfläche 39 hat dabei einen größeren Außendurchmesser als die Außenoberfläche 40 der übrigen Bereiche 41. Die Randsegmente 38 bilden dabei jeweils einen Übergang zwischen den beiden vorgenannten Außendurchmessern, so dass die durch die Kontaktwalze auf die Materialbahn einwirkende Radialkraft sich nicht in Abhängigkeit von der axialen Position sprunghaft ändert, sondern einen Übergang aufweist.The Fig. 3 shows a section through a contact roller 1 according to the invention. The contact roller 1 comprises a roller core 31 and a surface layer 32, which in the present example covers the entire axial extension of the roller core. The segments 36 are incorporated into the surface layer, which in the radial direction can also comprise individual layers of different, identical or similar materials. The segments 36 each include a central segment 37 and to the right and left of it edge segments 38. The outer surface 39 has a larger outer diameter than the outer surface 40 of the remaining areas 41. The edge segments 38 each form a transition between the two aforementioned outer diameters, so that the radial force acting on the web of material through the contact roller does not change abruptly as a function of the axial position, but has a transition.

Die Oberflächenschicht 32 besteht aus mehreren Teilen, wobei die übrigen Bereiche 41 nicht zusammenhängend, sondern durch die vorzugsweise ringförmig ausgebildeten Segmente 36 unterbrochen sind. Ein Zentralsegment 37 und die diesem zugeordneten Randsegmente können einteilig, aber auch mehrteilig ausgebildet sein. Die in Bezug auf die Achse der Kontaktwalze in einem Winkel verlaufenden Außenoberflächen der Randsegmente können beispielsweise durch ein formgebendes Herstellungsverfahren erzeugt werden. Ist das Material der Segmente beispielsweise ein Kunststoff oder ein Gummi, so kann dieses mittels einer Gussform hergestellt werden. Weiterhin steht eine mechanische Bearbeitung zur späteren Formgebung nach der Erzeugung des Segments zur Verfügung. Die Segmente 36 können auch als Dehnspannelemente, wie sie anhand der Figur 6 erläutert werden, ausgestaltet sein. Der Vorteil hierbei ist, dass der Außendurchmesser variabel einstellbar ist.The surface layer 32 consists of several parts, the remaining areas 41 not being contiguous but being interrupted by the segments 36, which are preferably of annular design. A central segment 37 and the edge segments assigned to it can be designed in one piece, but also in several pieces. The outer surfaces of the edge segments, which run at an angle with respect to the axis of the contact roller, can be produced, for example, by a shaping manufacturing process. If the material of the segments is a plastic or a rubber, for example, this can be produced by means of a casting mold. Mechanical processing is also available for later shaping after the segment has been created. The segments 36 can also be used as expansion tensioning elements, as shown in FIG Figure 6 be explained, designed. The advantage here is that the outside diameter can be adjusted variably.

Die Fig. 4 zeigt nun eine alternative Ausführungsform, bei der im Vergleich zur Figur 3 keine mehrteilige Oberflächenschicht 41 vorgesehen ist. Vielmehr ist eine durchgehende Oberflächenschicht 42 vorgesehen. Die Segmente 43 können nun einfach auf die Oberflächenschicht 42 aufgetragen werden. Wie es in der Figur 4 genauer dargestellt ist, können die Segmente auch innerhalb von in die Oberflächenschicht 42 eingebrachte, umlaufende Nuten angeordnet sein. Diese Nuten können beispielsweise durch eine spanende Bearbeitung, etwa durch Fräsen, erzeugt werden. Die Segmente 43 können, insbesondere, wenn sie nicht in Nuten angeordnet sind, in axialer Richtung der Kontaktwalze relativ zur Oberflächenschicht verschiebbar sein. Damit lässt sich die erfindungsgemäße Kontaktwalze sehr einfach an die Materialbahnbreite und/oder die Anzahl der Nutzen anpassen.The Fig. 4 now shows an alternative embodiment in which compared to FIG Figure 3 no multi-part surface layer 41 is provided. Rather is a continuous surface layer 42 is provided. The segments 43 can now simply be applied to the surface layer 42. Like it in the Figure 4 As shown in more detail, the segments can also be arranged within circumferential grooves made in the surface layer 42. These grooves can be produced, for example, by machining, for example by milling. The segments 43 can, in particular if they are not arranged in grooves, be displaceable in the axial direction of the contact roller relative to the surface layer. The contact roller according to the invention can thus be adapted very easily to the width of the material web and / or the number of panels.

In der Fig. 5 ist ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Kontaktwalze dargestellt. Hier zeichnen sich die Segmente 51 nicht durch im Vergleich zu den übrigen Bereichen 52 abweichenden geoemtrischen Ausgestaltungen aus, sondern durch andere Materialeigenschaften, insbesondere in Bezug auf den Elastizitätsmodul. Das Segment 51 kann dabei wieder aus einem Zentralsegment 53 und Randsegmenten 54 bestehen, wobei das Zentralsegment einen höheren Elastizitätsmodul aufweist als das der übrigen Bereiche 52. Die Randsegmente 54 weisen vorteilhafterweise Elastizitätsmodule auf, die zwischen denen des Zentralsegments 54 und der übrigen Bereiche 52 liegen, um einen Übergang zu schaffen, wie er im Zusammenhang mit der Figur 4 in Bezug auf die unterschiedlichen Durchmesser beschrieben wurde.In the Fig. 5 a further embodiment of a contact roller according to the invention is shown. Here, the segments 51 are not distinguished by geometrical configurations that differ from the other areas 52, but by different material properties, in particular with regard to the modulus of elasticity. The segment 51 can again consist of a central segment 53 and edge segments 54, the central segment having a higher modulus of elasticity than that of the other areas 52. The edge segments 54 advantageously have elasticity modules that lie between those of the central segment 54 and the other areas 52, to create a transition, as related to the Figure 4 has been described in relation to the different diameters.

Die Ausführungsform der Figur 5 bietet den großen Vorteil, dass im Bereich der Segmente aufgrund der größeren Härte des Materials dieses eine größere Andrückkraft bereitstellt als das Material der übrigen Bereiche 52, so dass die Ränder der Materialbahn beim Aufwickeln mit einer größeren Kraft beaufschlagbar sind, jedoch ohne dass der Außendurchmesser im Bereich der Segmente im Vergleich zu dem der übrigen Bereiche größer sein muss. Gleichwohl lassen sich die Ausführungsbeispiele der Figuren 3 oder 4 mit dem Ausführungsbeispiel der Figur 5 vorteilhaft kombinieren.The embodiment of the Figure 5 offers the great advantage that in the area of the segments, due to the greater hardness of the material, the latter provides a greater pressing force than the material of the remaining areas 52, so that the edges of the material web can be subjected to a greater force during winding, but without the outer diameter in the Area of the segments compared to that of the other areas must be larger. Nevertheless, the embodiments of Figures 3 or 4 with the embodiment of Figure 5 combine advantageously.

Die Figur 6 zeigt ein weiteres, vorteilhaftes Ausführungsbeispiel, bei dem - in radialer Richtung der Kontaktwalze gesehen - unterhalb der Außenoberfläche, vorteilhafterweise an der Grenze zwischen dem Walzenkern 61 und der Oberflächenschicht 62, wenigstens ein Dehnspannelement 63 vorgesehen ist. Ein Dehnspannelement umfasst eine in ihrer Form veränderbaren Außenoberfläche 64, die mit dem Material der Oberflächenschicht in Kontakt steht. Das Dehnspannelement kann dabei Bestandteil des Walzenkerns oder der Oberflächenschicht sein. Es kann darüber hinaus als separates Bauteil ausgestaltet sein, welches vor dem Aufbringen der Oberflächenschicht auf den Walzenkern aufgeschoben oder auf eine andere Art aufgetragen ist. Das Dehnspannelement ist vorteilhafterweise in Form eines Ringes ausgebildet, so dass sich eine Rotationssymmetrie ergibt, welche eine gleichmäßige Beeinflussung der Oberflächenschicht - in Umfangsrichtung gesehen - hervorruft.The Figure 6 shows a further, advantageous embodiment in which - viewed in the radial direction of the contact roller - at least one expansion tensioning element 63 is provided below the outer surface, advantageously at the boundary between the roller core 61 and the surface layer 62. An expansion tensioning element comprises an outer surface 64 which can be changed in shape and which is in contact with the material of the surface layer. The expansion tensioning element can be part of the roller core or the surface layer. It can also be designed as a separate component, which is pushed onto the roller core or applied in some other way before the surface layer is applied. The expansion tensioning element is advantageously designed in the form of a ring, so that a rotational symmetry results, which causes a uniform influence on the surface layer - seen in the circumferential direction.

Das Dehnspannelement umfasst einen Hohlraum 65, der mit einem unter Druck stehenden Fluid beaufschlagbar ist. Dieses Fluid kann ein Gas, eine Flüssigkeit oder ein anderes fließfähiges oder schüttfähiges Material sein. Besonders vorteilhaft ist hier eine inkompressible Flüssigkeit, wie etwa eine so genannte Hydraulikflüssigkeit. Um nun eine einfache Verstellbarkeit des Dehnspannelements zu ermöglichen, kann eine Leitung 66, beispielsweise in Form eines Rohres, vorgesehen sein. Am Ende der Leitung und vorzugsweise von der Stirnseite der Kontaktwalze erreichbar ist ein relativ zu der Leitung verschiebbarer Verschluss vorgesehen. Durch die Verschiebung kann nun über das Fluid der Druck innerhalb des Dehnspannelements erhöht oder verringert werden, so dass sich das Radialmaß von dessen Außenoberfläche 64 verändert. In einer praktischen Ausgestaltung kann der Verschluss eine Schraube sein, die relativ zu einem Innengewinde der Leitung 66 verdreht wird.The expansion tensioning element includes a cavity 65 to which a pressurized fluid can be applied. This fluid can be a gas, a liquid or some other flowable or pourable material. An incompressible fluid, such as a so-called hydraulic fluid, is particularly advantageous here. In order to enable simple adjustability of the expansion tensioning element, a line 66, for example in the form of a tube, can be provided. At the end of the line and preferably accessible from the end face of the contact roller, a closure is provided which is displaceable relative to the line. As a result of the displacement, the pressure within the expansion tensioning element can now be increased or decreased via the fluid, so that the radial dimension of its outer surface 64 changes. In a practical embodiment, the closure can be a screw that is rotated relative to an internal thread of the line 66.

Bei steigendem Druck wird - wie beschrieben - die Außenoberfläche nach außen bewegt. Dabei wird das Material des Segments zusammengedrückt und/oder ebenfalls weiter nach außen bewegt. Im ersten Fall erhält das Material eine Vorspannung, so dass die Kontaktwalze 1 mit diesen Segmenten eine erhöhte Kraft auf die Randbereiche der Materialbahn aufbringen kann. Diese gilt auch, wenn, wie im zweiten Fall, ebenfalls der Außendurchmesser des Segments vergrößert wird. Wird für die Oberflächenschicht ein kompressibles Material verwendet, können vorteilhafterweise die Materialien einen größeren, den gleichen oder sogar einen kleineren Elastizitätsmodul aufweisen als das Material der übrigen Bereiche.With increasing pressure - as described - the outer surface is moved outwards. The material of the segment is compressed and / or also moved further outwards. In the first case, the material is pretensioned so that the contact roller 1 with these segments can apply an increased force to the edge areas of the material web. This also applies if, as in the second case, the outer diameter of the segment is also increased. If a compressible material is used for the surface layer, the materials can advantageously have a greater, the same or even a smaller modulus of elasticity than the material of the other regions.

Bei der Kontaktwalze gemäß dem Ausführungsbeispiel gemäß der Figur 6 können selbstverständlich mehrere der beschriebenen Dehnspannelemente vorgesehen sein. Vorteilhaft ist, wenn diese selektiv einstellbar sind, um die Kontaktwalze auf unterschiedliche Materialbahnbreiten im ein- oder mehrnutzigen Betrieb einstellen zu können.In the contact roller according to the embodiment according to FIG Figure 6 several of the expansion tensioning elements described can of course be provided. It is advantageous if these can be selectively adjusted in order to be able to adjust the contact roller to different material web widths in single or multi-up operation.

Die Figur 7 zeigt nun ein Ausführungsbeispiel, bei dem die Segmente 76 gasdurchlässig ausgestaltet sind. Hierzu können die Segmente 76 mit Durchgangslöchern, etwa Bohrungen, versehen werden. Alternativ oder ergänzend hierzu können zumindest Teile der Segmente auch aus porösem, vorzugsweise mikroporösem Material bestehen. Das Material weist vorzugsweise Porengrößen im Bereich von 10 bis 100 Mikrometern auf.The Figure 7 now shows an embodiment in which the segments 76 are designed to be gas-permeable. For this purpose, the segments 76 can be provided with through holes, for example bores. As an alternative or in addition to this, at least parts of the segments can also consist of porous, preferably microporous material. The material preferably has pore sizes in the range from 10 to 100 micrometers.

Innenseitig der Oberflächenschicht kann ein umlaufender Gaskanal 73 vorgesehen sein, welcher mit Gasleitungen 74 verbunden ist. Diese Gasleitungen 74 führen über eine Drehdurchführung 75 nach außen, wo die Gasleitungen mit einer Gaszufuhr verbunden sind. Die Gaszufuhr ist zudem bevorzugt dazu eingerichtet und ausgestaltet, dass zwischen dem Gas und der Umgebung eine Druckdifferenz im Bereich von 20 mbar bis 1 bar herrscht. Bevorzugt wird als Gas Druckluft verwendet.A circumferential gas channel 73 which is connected to gas lines 74 can be provided on the inside of the surface layer. These gas lines 74 lead to the outside via a rotary leadthrough 75, where the gas lines are connected to a gas supply. The gas supply is also preferably set up and designed so that there is a pressure difference in the range from 20 mbar to 1 bar between the gas and the environment. Compressed air is preferably used as the gas.

Das Gas gelangt nun durch die Segmente an die Außenoberfläche, wo es zwischen den Segmenten und den Rändern der Materialbahn zur Ausbildung eines Luftfilms kommt, so dass im Bereich der Materialbahnränder eine im Vergleich zu den übrigen Bereichen höhere Andrückkraft herrscht.The gas now passes through the segments to the outer surface, where an air film is formed between the segments and the edges of the material web, so that there is a higher pressing force in the area of the material web edges compared to the other areas.

Die Figur 8 zeigt eine von der speziellen Ausgestaltung der Segmente unabhängige Ausführungsform der Erfindung, bei der die die Oberflächenschicht umfassende Hülse 82 entlang des Pfeils 83 relativ zu dem Kontaktwalzenkern verschiebbar ist. Dieses dient zum Austausch der Hülse 82 gegen eine andere, die beispielsweise eine andersartige Ausgestaltung und/oder eine andere Anordnung der Segmente aufweist, so dass die Kontaktwalze an die Bedürfnisse hinsichtlich der Bestandteile der Materialbahn und/oder deren Maße anpassbar ist. Weitere Details zu der Ausgestaltung dieser Erfindungsvariante wurden bereits weiter oben in der einleitenden Beschreibung angegeben.The Figure 8 shows an embodiment of the invention that is independent of the specific configuration of the segments, in which the Surface layer comprehensive sleeve 82 is displaceable along the arrow 83 relative to the contact roller core. This serves to replace the sleeve 82 with another one which has, for example, a different configuration and / or a different arrangement of the segments, so that the contact roller can be adapted to the requirements with regard to the components of the material web and / or their dimensions. Further details on the design of this variant of the invention have already been given above in the introductory description.

Die Figur 9 stellt eine erfindungsgemäße Kontaktwalze 91 dar, die für das verschiedene Breiten der Materialbahn einsetzbar ist. Hierzu umfasst die Kontaktwalze 91 verschiedene Segmente 92, die in unterschiedlichen Abständen zueinander angeordnet sind. Ein Anwendungsbereich für dieses wie auch für alle anderen erfindungsgemäßen Ausführungsbeispiele ist die Bildung von Wickeln mit so genannter Stretchfolie, die insbesondere im Gießfolienverfahren hergestellt wurde (hier später mehr). Eine Stretchfolie zeichnet sich dadurch aus, dass sie eine der folgenden Materialkombinationen umfassen: PE-LD, PE-LLD, mPE-LLD, PP. Dabei bedeuten "PE" Polyethylen, "LD" Low Density, "LLD" Linear Low Density, "mPE" Polyethylen hergestellt mit Metallocen-Katalysatoren und "PP" Polypropylen. Die Foliendicken betragen bis 50 Mikrometer, insbesondere bis 30 Mikrometer. Die Dehnbarkeit (Längenänderungen in einer Richtung) dieser Folien beträgt mindestens 150 %, insbesondere mindestens 250 %. In der Regel sind die Oberflächen dieser Stretchfolien stark haftend bis klebrig. Solche Stretchfolien werden in der Regel zu Wickeln mit 50 cm Bahnbreite, jedoch auch zu Wickeln mit 25 cm Bahnbreite aufgewickelt, da dieses Normbreiten sind, welche auf verschiedene Verpackungsautomaten abgestimmt sind. Selbstverständlich sind auch andere, insbesondere größere Bahnbreiten möglich, wie beispielsweise 45 cm, 75 cm und 100 cm.The Figure 9 shows a contact roller 91 according to the invention, which can be used for the different widths of the material web. For this purpose, the contact roller 91 comprises different segments 92 which are arranged at different distances from one another. One area of application for this as well as for all other exemplary embodiments according to the invention is the formation of wraps with so-called stretch film, which was produced in particular using the cast film process (more here later). A stretch film is characterized by the fact that it comprises one of the following material combinations: PE-LD, PE-LLD, mPE-LLD, PP. "PE" means polyethylene, "LD" means low density, "LLD" means linear low density, "mPE" means polyethylene made with metallocene catalysts and "PP" means polypropylene. The film thicknesses are up to 50 micrometers, in particular up to 30 micrometers. The extensibility (changes in length in one direction) of these films is at least 150%, in particular at least 250%. As a rule, the surfaces of these stretch films are strongly adhesive to sticky. Such stretch films are usually wound into rolls with a width of 50 cm, but also into rolls with a width of 25 cm, since these are standard widths which are matched to various automatic packaging machines. Of course, other, in particular larger, web widths are also possible, such as 45 cm, 75 cm and 100 cm.

Die Segmente der Kontaktwalze sind nun so verteilt, dass sie - abgesehen von einnutzigen Wickel - auch zweinutzige Wickel 93 bilden kann. Es können jedoch auch vier Nutzen 94 gebildet werden, ohne die Kontaktwalze austauschen zu müssen, wobei weitere Segmente 94 vorgesehen sind, die jedoch auch bei der Bildung von zwei Nutzen an der Kontaktwalze verbleiben können, da sie auf den Wickel keinen - weder positiven noch negativen - Einfluss ausüben. Weitere Segmente können vorgesehen sein, um weitere Nutzenbreiten und/oder Nutzenanzahlen verarbeiten zu können.The segments of the contact roller are now distributed in such a way that they - apart from single-use laps - can also form two-use laps 93. However, four benefits 94 can also be formed without having to replace the contact roller, further segments 94 being provided which However, even when two panels are formed, they can remain on the contact roller, since they have no - neither positive nor negative - influence on the roll. Further segments can be provided in order to be able to process further widths and / or numbers of uses.

Die Figur 10 stellt nun schematisch die wesentlichen Elemente einer Gießfolienanlage 100 dar, wie sie vorzugsweise zur Herstellung der bereits weiter oben beschriebenen Stretch-Folien verwendbar ist. Über Extruder, die nicht dargestellt sind, wird der Düsenkopf 101 mit - meist mehreren unterschiedlichen - plastifizierten Kunststoffströmen beaufschlagt. Nach der Zusammenführung und der Verteilung in die Breite dieser Kunststoffströme, was die Aufgabe des Düsenkopfes ist, tritt die Schmelze aus letzterem aus und wird als Schmelzevorhang auf die Kühlwalze 102 gegeben, welche in Richtung des Pfeils 103 rotiert. Nach einer gewissen Verweilzeit wird die mittlerweile abgekühlte und daher nun eine Folienbahn 104 bildende Kunststoffmasse mittels der Walze 105 von der Kühlwalze 102 abgenommen. Die Folienbahn 104 wird nun über weitere Walzen 106 der Wickelvorrichtung 107 zugeführt. In dieser Wickelvorrichtung befindet sich eine erfindungsgemäße Kontaktwalze 1, über welche die Folienbahn 104 geführt wird und mit welcher diese an den Wickel 108 angedrückt und auf diesen aufgewickelt wird.The Figure 10 now schematically represents the essential elements of a cast film system 100, as it can preferably be used for producing the stretch films already described above. The nozzle head 101 is acted upon by — usually several different — plasticized plastic flows via extruders, which are not shown. After these plastic streams have been brought together and distributed across the width, which is the task of the nozzle head, the melt emerges from the latter and is applied as a melt curtain to the cooling roller 102, which rotates in the direction of arrow 103. After a certain dwell time, the plastic compound, which has meanwhile cooled down and is therefore now forming a film web 104, is removed from the cooling roller 102 by means of the roller 105. The film web 104 is now fed to the winding device 107 via further rollers 106. In this winding device there is a contact roller 1 according to the invention, over which the film web 104 is guided and with which it is pressed against the roll 108 and wound onto it.

In Bezug auf verschiedene Figuren wurden vorteilhafte Ausführungsformen lediglich anhand eines Segments erläutert. Selbstverständlich können bei diesen Ausführungsformen mehrere oder sogar alle Segmente wie beschrieben ausgeführt sein, ohne dass dieser Sachverhalt in der betreffenden Figur wiedergegeben ist. Weiterhin ist zu betonen, dass die Merkmale, die im Zusammenhang mit einzelnen Ausführungsbeispielen beschrieben worden sind, frei mit Merkmalen anderer Ausführungsbeispiele kombinierbar sind. Der Fachmann wird in seinem Bestreben nach einer möglichst effizienten Ausgestaltung der Erfindung vorteilhafte Kombinationen hieraus bilden. Bezugszeichenliste 1, 91 Kontaktwalze 2 Materialbahn 3 Wickel 4 Wellen und/oder Zapfen 5 Maschinengestell 6, 7, 26, 36, 43, 50, 76, 92 Segment 9, 10 Randbereich 11, 12 Rand 13 Materialbahnmitte 20 Trennmesser 21 Vereinzelte Materialbahn 23 Wickel 24 Wickelwelle 31, 61 Walzenkern 32, 62 Oberflächenschicht 37, 53 Zentralsegment 38, 54 Randsegment 39, 40 Außenoberfläche 41, 52 Übriger Bereich 42 Durchgehende Oberflächenschicht 63 Drehspannelement 65 Hohlraum 66 Leitung 73 Gaskanal 74 Gasleitung 75 Drehdurchführung 82 Hülse 83, 103 Pfeil 93 Zweinutziger Wickel 94 Viernutziger Wickel 100 Gießfolienanlagen 101 Düsenkopf 102 Kühlwalze 104 Folienbahn 108 Wickel With reference to various figures, advantageous embodiments have only been explained using one segment. Of course, in these embodiments, several or even all segments can be designed as described without this fact being reproduced in the relevant figure. It should also be emphasized that the features that have been described in connection with individual exemplary embodiments can be freely combined with features of other exemplary embodiments. The person skilled in the art will, in his endeavors for the most efficient possible configuration of the invention, form advantageous combinations thereof. List of reference symbols 1, 91 Contact roller 2 Material web 3 Wrap 4th Shafts and / or journals 5 Machine frame 6, 7, 26, 36, 43, 50, 76, 92 segment 9, 10 Edge area 11, 12 edge 13 Material web center 20th Cutting knife 21st Isolated web of material 23 Wrap 24 Winding shaft 31, 61 Roll core 32, 62 Surface layer 37, 53 Central segment 38, 54 Edge segment 39, 40 Exterior surface 41, 52 Remaining area 42 Continuous surface layer 63 Rotary clamping element 65 cavity 66 management 73 Gas duct 74 Gas pipe 75 Rotating union 82 Sleeve 83, 103 arrow 93 Twenty-two wrap 94 Four-up wrap 100 Cast film lines 101 Nozzle head 102 Chill roll 104 Film web 108 Wrap

Claims (10)

  1. A winding device for winding at least one web of material onto in each case one rotating roll, preferably for winding at least one web of plastic film, comprising a contact roll (1) for pressing at least one web of material (2), preferably a web of plastic film, against at least one rotating roll (3), wherein the contact roll (1) comprises a surface layer,
    characterized in
    that at least two segments (6, 7, 26, 36, 43, 50, 76, 92) spaced apart in the axial direction and extending in the circumferential direction are provided, in which the quality of the surface layer differs from the quality of the other areas (41, 52) of the surface layer, wherein at least portions of said segments are in contact with the edges (9, 10) of the at least one web of material (2) and
    that the segments (6, 7, 26, 36, 43, 50, 76, 92) of the surface layer have a greater material hardness than the other areas (41, 52) of the surface layer, wherein the edges (9, 10) of the web of material (2) can be pressed against the roll (3) with a higher pressing force than the other areas of the web of material.
  2. The winding device according to the preceding claim,
    characterized in that
    the segments (6, 7, 26, 36, 43, 50, 76, 92) have a larger outer surface diameter than the areas (41, 52) of the surface layer, which are adjacent to the segment.
  3. The winding device according to the preceding claims,
    characterized in that
    the surface layer comprises different roughnesses of its outer surface, wherein the roughness of the segments (6, 7) has a different value than the roughness of the other areas (41, 52).
  4. The winding device according to the preceding claims,
    characterized in that
    the roughness of the segments (6, 7, 26, 36, 43, 50, 76, 92) is less than the roughness of the other areas (41, 52).
  5. The winding device according to the preceding claims,
    characterized in that
    the surface layer has a cambered shape.
  6. The winding device according to any one of the preceding claims
    characterized in that
    the contact roll (1) comprises a base body and at least one sleeve concentrically surrounding said base body, which sleeve comprises one or a plurality of layers, wherein the outermost layer comprises the surface layer.
  7. The winding device according to the preceding claim,
    characterized in that
    the base body comprises at least partially carbon- and/or glass fiber reinforced plastic.
  8. The winding device according to any one of the two preceding claims,
    characterized in that
    the sleeve concentrically surrounding the base body is displaceable relative to the base body.
  9. The winding device according to any one of the three preceding claims,
    characterized in that
    the sleeve concentrically surrounding the base body can be non-positively connected to the base body.
  10. A method for winding at least one web of material (2), wherein at least one web of material is pressed with a contact roll (1, 91) against at least one rotating roll (3), wherein the contact roll (1, 91) comprises a surface layer,
    characterized in
    that at least at least two segments (6, 7, 26, 36, 43, 50, 76, 92) of the contact roll (1, 91) spaced apart in the axial direction and extending in the circumferential direction are provided, in which the quality of the surface layer differs from the quality of the other areas of the surface layer, with which edges (11, 12) of the at least one web of material are in contact or are brought into contact and
    that the segments of the surface layer have a greater material hardness than the other areas (41, 52) of the surface layer, wherein the edges (6, 7, 26, 36, 43, 50, 76, 92) of the web of material can be pressed against the roll with a higher pressing force than the other areas (41, 52) of the web of material.
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US20170327334A1 (en) 2017-11-16
WO2016079059A1 (en) 2016-05-26

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