WO2006007971A1 - Planar laying and take-off device - Google Patents

Planar laying and take-off device Download PDF

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Publication number
WO2006007971A1
WO2006007971A1 PCT/EP2005/007228 EP2005007228W WO2006007971A1 WO 2006007971 A1 WO2006007971 A1 WO 2006007971A1 EP 2005007228 W EP2005007228 W EP 2005007228W WO 2006007971 A1 WO2006007971 A1 WO 2006007971A1
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WO
WIPO (PCT)
Prior art keywords
take
rolls
film tube
torque
film
Prior art date
Application number
PCT/EP2005/007228
Other languages
German (de)
French (fr)
Inventor
Karsten Golubski
Klemens Sensen
Original Assignee
Windmöller & Hölscher Kg
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Filing date
Publication date
Application filed by Windmöller & Hölscher Kg filed Critical Windmöller & Hölscher Kg
Publication of WO2006007971A1 publication Critical patent/WO2006007971A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92038—Torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92085—Velocity
    • B29C2948/92095—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92428—Calibration, after-treatment, or cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92438—Conveying, transporting or storage of articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Definitions

  • the invention relates to a trigger device according to the preamble of claim 1.
  • Such draw-off devices are generally used in plants for the production of plastic film hoses.
  • These film tubes are usually produced by supplying plastic melt to a blow head, in which the melt is distributed to an annular channel and leaves it through the nozzle gap. Immediately thereafter, the melt solidifies to form a film tube having a substantially circular cross-section.
  • a flattening unit follows, with which the film tube is folded into two superimposed film webs. One of the subsequent take-off rolls acts on the flat-laid film tube with a force which ensures the further transport of the film sheet.
  • a further processing device can, for example, be a device for reversing the film tube
  • a storage device can be a winding device in which the film tube is wound into a winding DE 100 40 055 C1 shows Some of the above elements, such as the flattening device, the take-off rolls and a reversing device.
  • one of the take-off rolls is driven by a drive torque acting on its axis.
  • This torque is generated by a drive such as an electric motor.
  • This take-off roll acts on the flattened film tube, which then in turn entrains the second take-off roll. Since the two webs of the flattened film tube are connected to each other only on their two side edges, this construction of the trigger device can lead to a reduced quality of the film tube. Thus, in practice, bow folds or edge folds have frequently appeared in one or both webs of the flattened film tube.
  • withdrawal devices are also known in which the film tube is already cut in the region of its side edges before it passes through the withdrawal devices and is thereby singulated into two film webs.
  • draw-off devices can also comprise more than two rollers.
  • An object of the present invention is therefore to propose a take-off device with which the quality losses of the film tubes caused by the withdrawal device can be reduced.
  • means are provided for providing torque for the axis of at least one further take-off roll.
  • torque By providing torque to the axle, it is meant that torque is transmitted directly to the axle. It is not meant that the moving foil has a force on the Peripheral surface of the take-off rolls exerts, which is implemented because of the stationary but rotatable mounting of the rollers in torque.
  • Means for providing torque for an axle may be drives, but especially also torque transmitting means, which transmits torque from a drive, for example, the torque applied to the first nip roll, for example, on the second roller.
  • the idea of the present invention is thus to apply a driving force to both sides of the film tube or both film webs for the purpose of transporting them from the opposite take-off rolls.
  • the side edges of the flattened film tube are now exposed to no and at least significantly lower mechanical loads, so that no more edge wrinkles can occur. Quality losses due to the passage of the trigger device are thus reduced or even completely prevented.
  • the means for providing torque for the axis of at least one further Absaugswalze mechanical torque transmission means which can be acted upon by the drive of the first take-off roll with torque.
  • the axis of the second take-off roll may be connected via gears, belts or chains with the axis of the first take-off roll. This connection can also exist directly to drive the first take-off roll. If more than two take-off rolls are present, the axes of all other take-off rolls are preferably also connected in terms of drive technology to the axis of the first take-off roll.
  • the drives act on the axes of the at least two take-off rolls without the interposition of transmission means. In this way, additional mechanical components can be saved.
  • edges of the folded film tube may have small edge folds. These are often caused by the fact that the take-off rolls used is drivable, with certain types of film, the edges of the folded film tube may have small edge folds. These are often caused by the fact that the
  • Diameter is different. For example, if one of the take-off rolls has a coating of elastomeric material, compression of that material can alter the effective radius of that roll. For this
  • the at least two take-off rolls can be driven at different speeds. These different speeds can be determined, for example, by a mechanical translation between the individual take-off rolls or between the drives and the take-off rolls.
  • Gear ratios greater than or less than 1 are conceivable.
  • the speeds of the at least two take-off rolls are independently variable. This can be reacted in different ways to the problem described above. If edge folds occur, one of the rolls can then be accelerated or slowed down relative to another roll.
  • Speed changes can be realized with mechanical connections via different gear stages, but can especially at
  • Deduction rollers which are each assigned a drive, via a
  • FIG. 3 a side view of the take-off device according to FIG.
  • Fig. 1 shows a known blown film extrusion plant 1.
  • the filler neck 4, a plastic is supplied, which is then plasticized in the extruder 3.
  • the resulting mass is supplied via a connecting line 14 to the blowing head 5, which forms a film tube 9.
  • the film tube 9 leaves the blowing head 5 by a non-visible annular nozzle in the transport direction z. Due to the supply of compressed air through the fan nozzle 15 of the film tube is expanded immediately after leaving the Blaskopfes 5.
  • the diameter of the film tube 9 is limited by the calibration 20.
  • Within the Kalibrierkorbes 20 of the film tube 9 is guided by plates 28, which is directed by compressed air onto the film tube.
  • the calibration basket 20 also consists of a frame 21 and 6.
  • a flattening unit 21 After leaving the Kalibrierkorbes 20 of the film tube 9 passes into a flattening unit 21, in which the film tube 9 is almost or completely reshaped to a double-layered film web.
  • the film tube 9 is guided between pairs of guide elements 7, 13, which assume an ever smaller distance from each other in the course of the transport direction z.
  • the complete flattening is done by a take-off device 22, which consists of a pair of take-off rolls 8, 8 '.
  • the film web 9 can now be guided by a reversing device, not shown, but known for example from DE 100 40 055 C1, or, as in the case of the device shown, are fed directly via deflecting rollers 10 a winding device 11, where the film web 9 to form a winding 12 is processed.
  • FIGs 2 and 3 shows a detailed view of the extraction device according to the invention 22.
  • A, A ' the directions of rotation of the take-off rolls 8, 8' are designated.
  • Figures 4 and 5 show a further embodiment of a discharge device 22 according to the invention. In this case, the motors 23, 23 'act directly on the axes 26, 26' of the take-off rolls 8 and 8 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Winding Of Webs (AREA)

Abstract

The invention relates to a take-off device (22), for a film tube production device (1), by means of which the film tube may be squeezed such that the air contained therein escapes and the tube or the film web formed from the tube may be introduced into a reprocessing and/or a storage device (12) with the following characteristics: at least two take-off rollers (8,8'), arranged to both sides of the transport path of the film tube (9) and which may be brought into contact with the same (9) and a drive (23) for provision of torque for the axle (26) of one of the take-off rollers (8). Of novelty is the provision for such a take-off device of means of provision of torque for the axle (26') of at least one further take-off roller (8').

Description

Flachlege- und Abzugsvorrichtung Flat laying and extraction device
Die Erfindung betrifft eine Abzugsvorrichtung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a trigger device according to the preamble of claim 1.
Derartige Abzugsvorrichtungen werden in der Regel in Anlagen zur Herstellung von Folienschläuchen aus Kunststoffen verwendet. Diese Folienschläuche werden meist dadurch hergestellt, dass Kunststoffschmelze einem Blaskopf zugeführt wird, in dem die Schmelze auf einen ringförmigen Kanal verteilt wird und diesen durch den Düsenspalt verlässt. Direkt anschließend verfestigt sich die Schmelze und bildet so einen Folienschlauch mit einem im wesentlichen kreisförmigen Querschnitt. In der Regel schließt sich eine Flachlegeeinheit an, mit der der Folienschlauch zu zwei übereinander liegenden Folienbahnen zusammengelegt wird. Eine der sich anschließenden Abzugswalzen beaufschlagt den flach gelegten Folienschlauch mit einer Kraft, welche für den Weitertransportiert des Folienschiauches sorgt. Dieser Vorgang wird häufig auch als „Abziehen des Folienschlauches" bezeichnet. Jedoch sind in der Regel zumindest zwei Abzugswalzen in einer Abzugsvorrichtung zu finden, durch deren Walzenspalt der Folienschlauch transportiert wird. Diese Abzugswalzen dienen dann auch als Abquetschwalzen, da sie verhindern, dass die innerhalb des Folienschlauches vorhandene Luft auch zwischen den übereinander liegenden Folienbahnen verbleibt. Der abgezogene Folienschlauch wird anschließend einer Weiterverarbeitungs- und/oder einer Speichervorrichtung zugeführt. Eine Weiterverarbeitungsvorrichtung kann beispielsweise eine Vorrichtung zum Reversieren des Folienschlauches sein. Eine Speichervorrichtung kann eine Wickelvorrichtung sein, in der der Folienschlauch zu Wickeln aufgewickelt wird. Die DE 100 40 055 C1 zeigt einige der genannten Elemente, etwa die Flachlegevorrichtung, die Abzugswalzen und eine Reversiervorrichtung.Such draw-off devices are generally used in plants for the production of plastic film hoses. These film tubes are usually produced by supplying plastic melt to a blow head, in which the melt is distributed to an annular channel and leaves it through the nozzle gap. Immediately thereafter, the melt solidifies to form a film tube having a substantially circular cross-section. In general, a flattening unit follows, with which the film tube is folded into two superimposed film webs. One of the subsequent take-off rolls acts on the flat-laid film tube with a force which ensures the further transport of the film sheet. This process is often referred to as "peeling off the film tube." However, at least two take-off rolls are generally to be found in a take-off device, through the nip of which the film tube is transported.These take-off rolls then serve as squeeze rolls, since they prevent the inside The withdrawn film tube is then fed to a further processing and / or a storage device A further processing device can, for example, be a device for reversing the film tube A storage device can be a winding device in which the film tube is wound into a winding DE 100 40 055 C1 shows Some of the above elements, such as the flattening device, the take-off rolls and a reversing device.
In einer Abzugsvorrichtung des Standes der Technik wird eine der Abzugswalzen durch ein auf ihre Achse wirkendes Antriebsdrehmoment angetrieben. Dieses Drehmoment wird durch einen Antrieb wie etwa einen Elektromotor erzeugt. Diese Abzugswalze wirkt auf den flachgelegten Folienschlauch, welcher dann seinerseits die zweite Abzugswalze mitschleppt. Da die beiden Bahnen des flachgelegten Folienschlauches nur über ihre beiden Seitenkanten miteinander verbunden sind, kann dieser Aufbau der Abzugsvorrichtung zu einer verringerten Qualität des Folienschlauches führen. So haben sich in der Praxis häufig Bogenfalten oder Randfalten in einer oder in beiden Bahnen des flachgelegten Folienschlauches gezeigt. Jedoch sind auch Abzugsvorrichtungen bekannten, bei denen der Folienschlauch bereits vor dem Durchlaufen der Abzugsvorrichtungen im Bereich seiner Seitenkanten eingeschnitten wird und dadurch zu zwei Folienbahnen vereinzelt wird. Da die Folienbahnen sich beim Durchlaufen des Walzenspaltes zwischen den Abzugswalzen berühren, kann es in Folge der unterschiedlichen Krafteinwirkungen auf die Bahnen zu einem Verrutschen der Bahnen gegeneinander und/oder zu einer Faltenbildung beziehungsweise zu weiteren Beschädigungen kommen. An dieser Stelle sei erwähnt, dass Abzugsvorrichtungen auch mehr als zwei Walzen umfassen können.In a prior art take-off device, one of the take-off rolls is driven by a drive torque acting on its axis. This torque is generated by a drive such as an electric motor. This take-off roll acts on the flattened film tube, which then in turn entrains the second take-off roll. Since the two webs of the flattened film tube are connected to each other only on their two side edges, this construction of the trigger device can lead to a reduced quality of the film tube. Thus, in practice, bow folds or edge folds have frequently appeared in one or both webs of the flattened film tube. However, withdrawal devices are also known in which the film tube is already cut in the region of its side edges before it passes through the withdrawal devices and is thereby singulated into two film webs. Since the film webs touch each other when passing through the nip between the draw-off rollers, the webs may cause the webs to slip against each other and / or cause wrinkling or other damage as a result of the different forces acting on the webs. At this point it should be mentioned that draw-off devices can also comprise more than two rollers.
Eine Aufgabe der vorliegenden Erfindung ist es daher, eine Abzugsvorrichtung vorzuschlagen, mit welcher sich die von der Abzugsvorrichtung verursachten Qualitätseinbußen der Folienschläuche reduzieren lassen.An object of the present invention is therefore to propose a take-off device with which the quality losses of the film tubes caused by the withdrawal device can be reduced.
Die Aufgabe wird gelöst durch eine Vorrichtung, die die Merkmale des Kennzeichens des Anspruchs 1 aufweist.The object is achieved by a device having the features of the characterizing part of claim 1.
Demnach sind Mittel zur Bereitstellung von Drehmoment für die Achse zumindest einer weiteren Abzugswalze vorgesehen. Mit Bereitstellung von Drehmoment für die Achse ist gemeint, dass Drehmoment direkt auf die Achse übertragen wird. Es ist nicht gemeint, dass die bewegte Folie eine Kraft auf die Umfangsfläche der Abzugswalzen ausübt, welche wegen der ortsfesten aber drehbaren Lagerung der Walzen in Drehmoment umgesetzt wird. Mittel zur Bereitstellung von Drehmoment für eine Achse können Antriebe, vor allem aber auch Drehmomentübertragungsmittel sein, welche Drehmoment von einem Antrieb, der beispielsweise auch die erste Abquetschwalze mit Drehmoment beaufschlagt, zum Beispiel auf die zweite Walze überträgt. Der Gedanke der vorliegenden Erfindung ist also, beide Seiten des Folienschlauches oder beide Folienbahnen zum Zwecke ihres Transportes von den sich gegenüber liegenden Abzugswalzen jeweils mit einer Antriebskraft zu beaufschlagen. Die Seitenkanten des flachgelegten Folienschlauches werden nun keinen und zumindest deutlich geringeren mechanischen Belastungen ausgesetzt, so dass keine Randfalten mehr entstehen können. Qualitätseinbußen aufgrund des Durchlaufens der Abzugsvorrichtung werden also verringert oder sogar ganz verhindert.Accordingly, means are provided for providing torque for the axis of at least one further take-off roll. By providing torque to the axle, it is meant that torque is transmitted directly to the axle. It is not meant that the moving foil has a force on the Peripheral surface of the take-off rolls exerts, which is implemented because of the stationary but rotatable mounting of the rollers in torque. Means for providing torque for an axle may be drives, but especially also torque transmitting means, which transmits torque from a drive, for example, the torque applied to the first nip roll, for example, on the second roller. The idea of the present invention is thus to apply a driving force to both sides of the film tube or both film webs for the purpose of transporting them from the opposite take-off rolls. The side edges of the flattened film tube are now exposed to no and at least significantly lower mechanical loads, so that no more edge wrinkles can occur. Quality losses due to the passage of the trigger device are thus reduced or even completely prevented.
In einer besonders einfachen Ausgestaltung der Erfindung ist vorgesehen, dass die Mittel zur Bereitstellung von Drehmoment für die Achse zumindest einer weiteren Ab∑ugswalze mechanische Drehmomentübertragungsmittel sind, welche von dem Antrieb der ersten Abzugswalze mit Drehmoment beaufschlagbar sind. Die Achse der zweiten Abzugswalze kann über Zahnräder, Riemen oder Ketten mit der Achse der ersten Abzugswalze verbunden sein. Diese Verbindung kann auch direkt zum Antrieb der ersten Abzugswalze bestehen. Sind mehr als zwei Abzugswalzen vorhanden, so sind vorzugsweise auch die Achsen aller weiteren Abzugswalzen antriebstechnisch mit der Achse der ersten Abzugswalze verbunden.In a particularly simple embodiment of the invention, it is provided that the means for providing torque for the axis of at least one further Absaugswalze mechanical torque transmission means which can be acted upon by the drive of the first take-off roll with torque. The axis of the second take-off roll may be connected via gears, belts or chains with the axis of the first take-off roll. This connection can also exist directly to drive the first take-off roll. If more than two take-off rolls are present, the axes of all other take-off rolls are preferably also connected in terms of drive technology to the axis of the first take-off roll.
Besonders vorteilhaft ist es, wenn die Mittel zur Bereitstellung von Drehmoment für die Achse zumindest einer weiteren Abzugswalze einen weiteren Antrieb aufweisen. Dadurch kann die mechanische Verbindung zwischen den einzelnen Abzugwalzen vermieden werden, was zu einer Einsparung von verschleißanfälligen Bauteilen führt. Zudem müssen häufig die Abzugwalzen relativ zueinander in einer Ebene quer zur Transportrichtung des Folienschlauches verschiebbar sein, um die Größe des Walzenspaltes in Abhängigkeit von der Foliendicke einstellen zu können. Dies ist bei einer Verwendung von einzelnen Antrieben für jede Abzugswalze besonders einfach zu realisieren.It when the means for providing torque for the axis of at least one further take-off roll have a further drive is particularly advantageous. As a result, the mechanical connection between the individual withdrawal rollers can be avoided, which leads to a saving of components susceptible to wear. In addition, often the withdrawal rollers must be displaceable relative to one another in a plane transverse to the transport direction of the film tube in order to adjust the size of the nip in dependence on the film thickness can. This is at a Use of individual drives for each take-off roll is particularly easy to implement.
In einer vorteilhaften Ausführungsform ist vorgesehen, dass die Antriebe ohne Zwischenschaltung von Getriebemitteln auf die Achsen der zumindest zwei Abzugswalzen wirken. Auf diese Weise können weitere mechanische Komponenten eingespart werden.In an advantageous embodiment, it is provided that the drives act on the axes of the at least two take-off rolls without the interposition of transmission means. In this way, additional mechanical components can be saved.
Auch wenn jede der verwendeten Abzugswalzen antreibbar ist, können bei bestimmten Folientypen die Ränder des zusammengelegten Folienschlauches kleine Randfalten aufweisen. Diese kommen häufig dadurch zustande, dass dieAlthough each of the take-off rolls used is drivable, with certain types of film, the edges of the folded film tube may have small edge folds. These are often caused by the fact that the
Abzugswalzen zwar mit gleicher Drehgeschwindigkeit angetrieben werden, aber die Umfangsgeschwindigkeit der Abzugswalzen aufgrund unterschiedlicherAlthough take-off rolls are driven at the same rotational speed, but the peripheral speed of the take-off rolls due to different
Durchmesser verschieden ist. Weist eine der Abzugswalzen beispielsweise eine Beschichtung aus elastomerem Material auf, kann das Zusammendrücken dieses Materials den effektiven Radius dieser Walze verändern. Aus diesemDiameter is different. For example, if one of the take-off rolls has a coating of elastomeric material, compression of that material can alter the effective radius of that roll. For this
Grunde ist in einer vorteilhaften Weiterbildung der Erfindung vorgesehen, dass die zumindest zwei Abzugswalzen mit unterschiedlichen Drehzahlen antreibbar sind. Diese unterschiedlichen Drehzahlen können festgelegt sein, etwa durch eine mechanische Übersetzung zwischen den einzelnen Abzugswalzen oder zwischen den Antrieben und den Abzugswalzen. VerschiedeneBasically, it is provided in an advantageous development of the invention that the at least two take-off rolls can be driven at different speeds. These different speeds can be determined, for example, by a mechanical translation between the individual take-off rolls or between the drives and the take-off rolls. Various
Übersetzungsverhältnisse größer oder kleiner als 1 sind dabei denkbar.Gear ratios greater than or less than 1 are conceivable.
In einer besonders bevorzugten Ausführungsform sind die Drehzahlen der zumindest zwei Abzugswalzen unabhängig voneinander veränderbar. Damit kann auf unterschiedliche Weise auf das zuvor beschriebene Problem reagiert werden. Bei auftretenden Randfalten kann dann eine der Walzen relativ zu einer anderen Walzen beschleunigt oder verlangsamt werden.In a particularly preferred embodiment, the speeds of the at least two take-off rolls are independently variable. This can be reacted in different ways to the problem described above. If edge folds occur, one of the rolls can then be accelerated or slowed down relative to another roll.
Drehzahlveränderungen lassen sich bei mechanischen Verbindungen über verschiedene Getriebestufen realisieren, können aber insbesondere beiSpeed changes can be realized with mechanical connections via different gear stages, but can especially at
Abzugwalzen, welchen jeweils ein Antrieb zugeordnet ist, über eineDeduction rollers, which are each assigned a drive, via a
Veränderung der Drehzahl der Antriebe herbeigeführt werden. Weitere Ausführungsbeispiele der Erfindung gehen aus der gegenständlichen Beschreibung und den Ansprüchen hervor. Die einzelnen Figuren zeigen:Changing the speed of the drives are brought about. Further embodiments of the invention will become apparent from the description and the claims. The individual figures show:
Fig. 1 Blasfolienextrusionsanlage nach dem Stand der Technik Fig. 2 Eine erste erfindungsgemäße Abzugsvorrichtung Fig. 3 Seitenansicht der Abzugsvorrichtung gemäß Fig. 2 Fig. 4 Eine weitere erfindungsgemäße Abzugsvorrichtung Fig. 5 Seitenansicht der Abzugsvorrichtung gemäß Fig. 41 blown-film extrusion plant according to the prior art FIG. 3 a side view of the take-off device according to FIG
Fig. 1 zeigt eine bekannte Blasfolienextrusionsanlage 1. Dem Einfüllstutzen 4 wird ein Kunststoff zugeführt, der dann in dem Extruder 3 plastifiziert wird. Die entstandene Masse wird über eine Verbindungsleitung 14 dem Blaskopf 5 zugeführt, welcher einen Folienschlauch 9 bildet. Dabei verlässt der Folienschlauch 9 den Blaskopf 5 durch eine nicht sichtbare Ringdüse in Transportrichtung z. Aufgrund der Zuführung von Druckluft durch den Gebläsestutzen 15 wird der Folienschlauch unmittelbar nach Verlassen des Blaskopfes 5 aufgeweitet. Der Durchmesser des Folienschlauches 9 wird jedoch durch den Kalibrierkorb 20 begrenzt. Innerhalb des Kalibrierkorbes 20 wird der Folienschlauch 9 von Platten 28 geführt, durch welche Druckluft auf den Folienschlauch gerichtet wird. Der Kalibrierkorb 20 besteht zudem aus einem Rahmen 21 und 6. Nach dem Verlassen des Kalibrierkorbes 20 gelangt der Folienschlauch 9 in eine Flachlegeeinheit 21 , in welcher der Folienschlauch 9 nahezu oder vollständig zu einer doppellagigen Folienbahn umgeformt wird. Dabei wird der Folienschlauch 9 zwischen Paaren von Führungselementen 7, 13 geführt, die im Verlauf der Transportrichtung z einen immer geringeren Abstand voneinander einnehmen. Die vollständige Flachlegung erfolgt durch eine Abzugsvorrichtung 22, die aus einem Paar von Abzugswalzen 8, 8' besteht. Die Folienbahn 9 kann nun durch eine nicht gezeigte, aber beispielsweise aus der DE 100 40 055 C1 bekannte Reversiervorrichtung geführt werden, oder, wie im Falle der gezeigten Vorrichtung, direkt über Umlenkwalzen 10 einer Wickelvorrichtung 11 zugeführt werden, wo die Folienbahn 9 zu einem Wickel 12 verarbeitet wird. Die Figuren 2 und 3 zeigt eine Detailansicht der erfindungsgemäßen Abzugsvorrichtung 22. Rechts und links der Abzugswalzen 8, 8' sind auf nicht dargestellte Weise im Maschinengestell zwei Motoren 23, 23' gelagert, die ihre Antriebskraft auf die Riemenscheiben 24 übertragen. Auf diesen Riemenscheiben laufen Riemen 25, die Drehmomente auf die Achsen 26, 26' der Abzugswalzen 8 und 8' übertragen. Mit A, A' sind die Drehrichtungen der Abzugswalzen 8, 8' bezeichnet. Mit der in dieser Figur dargestellten Anordnung der Antriebe ist es möglich, die Abzugswalzen 8, 8' mit variablen und unterschiedlichen Geschwindigkeiten zu betreiben. Die Figuren 4 und 5 zeigen eine weitere Ausführungsform einer erfindungsgemäßen Abzugsvorrichtung 22. Hierbei wirken die Motoren 23, 23' direkt auf die Achsen 26, 26' der Abzugswalzen 8 und 8'. Fig. 1 shows a known blown film extrusion plant 1. The filler neck 4, a plastic is supplied, which is then plasticized in the extruder 3. The resulting mass is supplied via a connecting line 14 to the blowing head 5, which forms a film tube 9. In this case, the film tube 9 leaves the blowing head 5 by a non-visible annular nozzle in the transport direction z. Due to the supply of compressed air through the fan nozzle 15 of the film tube is expanded immediately after leaving the Blaskopfes 5. The diameter of the film tube 9 is limited by the calibration 20. Within the Kalibrierkorbes 20 of the film tube 9 is guided by plates 28, which is directed by compressed air onto the film tube. The calibration basket 20 also consists of a frame 21 and 6. After leaving the Kalibrierkorbes 20 of the film tube 9 passes into a flattening unit 21, in which the film tube 9 is almost or completely reshaped to a double-layered film web. In this case, the film tube 9 is guided between pairs of guide elements 7, 13, which assume an ever smaller distance from each other in the course of the transport direction z. The complete flattening is done by a take-off device 22, which consists of a pair of take-off rolls 8, 8 '. The film web 9 can now be guided by a reversing device, not shown, but known for example from DE 100 40 055 C1, or, as in the case of the device shown, are fed directly via deflecting rollers 10 a winding device 11, where the film web 9 to form a winding 12 is processed. Figures 2 and 3 shows a detailed view of the extraction device according to the invention 22. Right and left of the take-off rolls 8, 8 'are not shown in the machine frame two motors 23, 23' mounted, which transmit their driving force to the pulleys 24. On these pulleys run belt 25, the torques on the axes 26, 26 'of the take-off rolls 8 and 8' transmitted. With A, A ', the directions of rotation of the take-off rolls 8, 8' are designated. With the arrangement of the drives shown in this figure, it is possible to operate the take-off rolls 8, 8 'with variable and different speeds. Figures 4 and 5 show a further embodiment of a discharge device 22 according to the invention. In this case, the motors 23, 23 'act directly on the axes 26, 26' of the take-off rolls 8 and 8 '.
Figure imgf000009_0001
Figure imgf000009_0001

Claims

Flachlege- und AbzugsvorrichtungPatentansprüche Flat lay and take-off device patent claims
1. Abzugsvorrichtung (22) einer Folienschlauchherstellungsvorrichtung (1 ), mit welcher der Folienschlauch derart abquetschbar ist, dass in ihm enthal¬ tene Luft entweicht und der Schlauch oder die aus dem Schlauch gebildeten Folienbahnen einer Weiterverarbeitungs- und/oder einer Speichervorrich- tung (12) zuführbar sind und welche folgende Merkmale aufweist:1. extraction device (22) of a film tube manufacturing device (1) with which the film tube can be squeezed in such a way that air contained therein escapes and the tube or the film webs formed by the tube of a further processing and / or a storage device (12 ) can be supplied and which has the following features:
- zumindest zwei Abzugswalzen (8,8'), welche (8,8') beidseits des Förderwe¬ ges des Folienschlauches (9) angeordnet und mit diesem (9) in Kontakt bringbar sind,- At least two take-off rolls (8,8 '), which (8,8') on both sides of the Förderwe¬ ges of the film tube (9) and arranged with this (9) are brought into contact,
- einen Antrieb (23) zur Bereitstellung von Drehmoment für die Achse (26) einer der Abzugswalzen (8), gekennzeichnet durch- A drive (23) for providing torque for the axis (26) of one of the take-off rolls (8), characterized by
- Mittel zur Bereitstellung von Drehmoment für die Achse (26') zumindest ei¬ ner weiteren Abzugswalze (8').- means for providing torque for the axle (26 ') at least ei¬ ner further take-off roller (8').
2. Abzugsvorrichtung (22) nach Anspruch 1 , dadurch gekennzeichnet, dass die Mittel zur Bereitstellung von Drehmoment für die Achse (26') zumindest ei¬ ner weiteren Abzugswalze (8') mechanische Drehmomentübertragungsmittel sind, welche von dem Antrieb (23) der ersten Abzugswalze (8) mit Drehmoment beaufschlagbar sind. 2. extraction device (22) according to claim 1, characterized in that the means for providing torque for the axis (26 ') at least ei¬ ner further take-off roll (8') are mechanical torque transmitting means which of the drive (23) of the first Take-off roller (8) can be acted upon with torque.
3. Abzugsvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass3. extraction device according to claim 1, characterized in that
Mittel zur Bereitstellung von Drehmoment für die Achse (26') zumindest einer weiteren Abzugswalze (8') einen weiteren Antrieb (23') aufweisen.Means for providing torque for the axis (26 ') of at least one further take-off roll (8') have a further drive (23 ').
4. Abzugsvorrichtung (22) nach Anspruch 3, dadurch gekennzeichnet, dass die Antriebe (23, 23') ohne Zwischenschaltung von Getriebemitteln auf die Ach¬ sen (26, 26') der zumindest zwei Abzugswalzen (8, 8') wirken.4. extraction device (22) according to claim 3, characterized in that the drives (23, 23 ') without the interposition of transmission means on the Ach¬ sen (26, 26') of the at least two take-off rolls (8, 8 ') act.
5. Abzugsvorrichtung (22) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die zumindest zwei Abzugswalzen (8, 8') mit unterschiedlichen Drehzahlen antreibbar sind.5. extraction device (22) according to any one of the preceding claims, characterized in that the at least two take-off rolls (8, 8 ') are drivable at different speeds.
6. Abzugsvorrichtung (22) nach dem vorstehenden Anspruch, dadurch gekennzeichnet, dass die Drehzahlen der zumindest zwei Abzugswalzen (8, 8') unabhängig vonein¬ ander veränderbar sind.6. extraction device (22) according to the preceding claim, characterized in that the rotational speeds of the at least two take-off rolls (8, 8 ') are independently vonein¬ variable.
7. Verfahren zum Abziehen eines Folienschlauches (9) von einer Folienschlauch- herstellungsvorrichtung (1 ), so dass dieser einer Weiterverarbeitungs- und/oder einer Speichervorrichtung (12) zugeführt werden kann, und welche zumindest zwei Abzugswalzen (8, 8') umfasst, welche beidseits des Folienschlauches (9) mit diesem in Kontakt stehen, wobei die Achse (26) einer der Abzugswalzen (8) durch einen ihr zugeordneten Antrieb (23) mit einem Drehmoment beaufschlagt wird, dadurch gekennzeichnet, dass auch die Achse (26') zumindest einer weiteren Abzugswalze (8') mit einem7. A method for removing a film tube (9) from a film tube production device (1) so that it can be fed to a further processing and / or a storage device (12), and which comprises at least two take-off rolls (8, 8 '), which on both sides of the film tube (9) are in contact therewith, wherein the axis (26) of one of the take-off rolls (8) is acted upon by a drive (23) associated therewith with a torque, characterized in that also the axis (26 ') at least one further take-off roll (8 ') with a
Drehmoment beaufschlagt wird. Torque is applied.
PCT/EP2005/007228 2004-07-16 2005-07-01 Planar laying and take-off device WO2006007971A1 (en)

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Application Number Priority Date Filing Date Title
DE102004034635 2004-07-16
DE102004034635.6 2004-07-16
DE102005004496.4 2005-02-01
DE102005004496A DE102005004496B4 (en) 2004-07-16 2005-02-01 off device

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US4682941A (en) * 1985-06-11 1987-07-28 Windmoller & Holscher Flattening and take-off apparatus for providing a plastic film web from a blown tubular film
US5202068A (en) * 1990-10-24 1993-04-13 Modern Controls, Inc. Method and apparatus for controlling blown film thickness
EP0963830A1 (en) * 1998-06-08 1999-12-15 K & S Future Design Inc. Apparatus for producing plastic film
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US2976567A (en) * 1957-10-16 1961-03-28 Dow Chemical Co Process and apparatus for upgrading thermoplastic film
EP0010873A1 (en) * 1978-10-04 1980-05-14 Du Pont Canada Inc. Flat plastic net and process and apparatus for manufacturing flat plastic net
US4682941A (en) * 1985-06-11 1987-07-28 Windmoller & Holscher Flattening and take-off apparatus for providing a plastic film web from a blown tubular film
US5202068A (en) * 1990-10-24 1993-04-13 Modern Controls, Inc. Method and apparatus for controlling blown film thickness
EP0963830A1 (en) * 1998-06-08 1999-12-15 K & S Future Design Inc. Apparatus for producing plastic film
JP2004090464A (en) * 2002-08-30 2004-03-25 Toshiba Mach Co Ltd Film manufacturing apparatus

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US8651006B2 (en) 2008-06-26 2014-02-18 Krones Ag Apparatus and method for producing individual blanks from a film web

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