EP0593946B1 - Web winding device - Google Patents

Web winding device Download PDF

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Publication number
EP0593946B1
EP0593946B1 EP93115574A EP93115574A EP0593946B1 EP 0593946 B1 EP0593946 B1 EP 0593946B1 EP 93115574 A EP93115574 A EP 93115574A EP 93115574 A EP93115574 A EP 93115574A EP 0593946 B1 EP0593946 B1 EP 0593946B1
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EP
European Patent Office
Prior art keywords
winding
web
motor
contact
contact roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP93115574A
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German (de)
French (fr)
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EP0593946A3 (en
EP0593946A2 (en
Inventor
Rolf Kammann
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Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Publication of EP0593946A2 publication Critical patent/EP0593946A2/en
Publication of EP0593946A3 publication Critical patent/EP0593946A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/195—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in winding mechanisms or in connection with winding operations
    • B65H23/198—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in winding mechanisms or in connection with winding operations motor-controlled (Controlling electrical drive motors therefor)

Definitions

  • the invention relates to a device for winding up a web, preferably a plastic film web produced by blowing or casting, with a winding tube for the web driven by an electric winding motor, with a web tension measuring roller detecting the web tension, with one arranged between the winding tube and the web tension measuring roller an electric motor driven contact roller, which is adjustable for contact winding on the film roll being formed and is at a distance from the film roll during gap winding, and with a control device for regulating the motors as a function of the feed speed of the web in accordance with the measured web tensile force such that the winding hardness of the winding roll in can be influenced in a predetermined manner.
  • the web 1 to be wound is fed via a contact roller 2 to the winding tube 3 or the film roll 4 forming thereon and wound up to form the film roll 4, the contact roller being set against the circumference of the film roll 4 forming.
  • a web tension measuring roller 5 is arranged in front of the contact roller and measures the web tension of the film web running onto the contact roller 2. The web tension measuring roller 5 forms a web loop or deflects the web 1, so that the web tension can be determined from the tension exerted by the incoming and outgoing run of the web on the web tension measuring roller 5.
  • the web tension measuring roller 5 is assigned a measuring sensor 6, which supplies a signal corresponding to the web tension measured in each case to a control device, for example a computer 7.
  • a control device for example a computer 7.
  • This computer 7 compares the signal received by the transducer 6 as an actual value signal with a setpoint signal stored in the computer 7. If the two signals differ from one another, the direct current motor 8 driving the contact roller 2 is speed-controlled in a positive or negative sense, specifically in such a way that the sensor 6 the actual value signal supplied to the computer corresponds to the setpoint signal.
  • the motor 3 driving the sleeve 3 and the winding roll forming on this must also be regulated according to the growing diameter of the film roll 4. This is done by assigning a sensor 10 to the sleeve 3 or the mandrels or shaft journals carrying the sleeve 3, which sensor 10 determines the actual diameter of the film roll 4 via the number of revolutions of the sleeve 3. This value is a measure of the change in the torque of the winding motor 9.
  • the winding motor 9 is therefore regulated in its torque. This means that the torque of the motor 9 is changed in accordance with the diameter of the winding roll forming and the desired winding characteristic, while the speed of the motor 8 driving the contact roller 2 is regulated.
  • Another mode of operation is that the contact roller 2 has moved away from the sleeve 3 or the winding roll 4 forming on it and is at a distance from it. Such a winding is referred to as so-called "central gap winding". This mode of operation is always used when very sensitive foils have to be wound up which would suffer from the contact pressure on the part of the contact roller.
  • the winding rolls are wound by central gap winding in a known manner, the winding motor 8 and the motor 9 driving the contact roller 2 are regulated in the manner described above. Another type of control was previously not considered possible because the web tension between the sleeve 3 or the film roll 4 formed on this and the contact roller moved away from it cannot be measured because no measuring devices can be accommodated in the transition area. If the known winding device described with reference to FIG. 1 is operated as a central slit winder, the winding motor 9 is regulated in its torque in accordance with the increasing diameter of the winding roll 4 that is formed in such a way that the desired winding characteristic results.
  • the desired winding characteristic can only be achieved very imprecisely via a torque control of the winding motor, so that the torque control of the winding motor no longer meets the increased requirements for the characteristic of the winding hardness in winding rolls with more sensitive types of film.
  • the object of the invention is therefore to provide a device of the type mentioned at the outset, with which even more sensitive films can be wound into film rolls in the central gap winding, in which the winding hardness can be influenced in a manner corresponding to the more sensitive types of film.
  • this object is achieved in a device of the generic type by the features of characterizing the part of claim 1 and in particular by the fact that the control device is provided with a switchover by which central contact winding occurs the torque of the winding motor is regulated in accordance with the increasing winding roll diameter and the contact roller is driven at a speed corresponding to the web tensile force, and in the case of central gap winding the winding motor is speed-regulated in accordance with the measured web tensile force.
  • a sensitive winding of a web, preferably a plastic film web, to a film roll with the desired characteristic of the winding hardness can be achieved if the winding roll is driven at a speed which is regulated in accordance with the tensile force of the web running onto the film roll.
  • the tension or web tension with which each individual layer is wound can be determined sensitively and adapted to the desired winding characteristic.
  • a sensitive adjustment of the winding hardness to the desired winding characteristic can be achieved in particular via a speed control of the winding motor if the influence of the contact roller on the web tensile force can be eliminated.
  • the motor of the contact roller having a gap to the winding roller is torque-controlled in such a way that the motor torque compensates for the inertia of the contact roller.
  • the inertia of the contact roller can no longer change the web tension measured by the web tension measuring roller, so that the web tension measured with the help of the web tension measuring roller can be used sensitively to regulate the speed of the winding motor.
  • frictional influences can be taken into account and compensated for in the torque control of the motor of the contact roller.
  • the device according to the invention can thus be used both as a contact central winder and as a gap central winder, the contact roller winding motor being torque-controlled and the contact roller motor being speed-controlled and the central winding winding speed control of the winding motor and torque control of the contact roller only in such a way that this no longer has any effect on the web tension.
  • a corresponding switchover of the motors to the different operating modes can be effected in a simple manner by the control unit.
  • the winding motor and the motor of the contact roller are expediently direct current motors because their torque and speed can be regulated in a particularly simple manner.
  • the torque is proportional to the armature current I A and the speed is approximately proportional to the armature voltage U A.
  • torque control the web is only wound onto the winding roll with a roughly predeterminable web tension.
  • FIG. 2 An embodiment of the invention is described below with reference to FIG. 2, in which a winding device is shown schematically, which can be converted from contact central winding to gap central winding and vice versa.
  • the winder works as a contact central winder, that is to say in the same way as the winding device described with reference to FIG. 1.
  • the control in the manner shown in FIG. 2 thus takes place in the same way as the device according to FIG. 1, so that the same reference numbers as in FIG. 1 have been used for the same parts of the device according to FIG. 2.
  • the contact roller 2 is always at a distance or nip from the film roll 4.
  • the motors 8 and 9 are switched over, in such a way that the speed of the motor 9 and the torque of the motor 8 are regulated.
  • the signal fed to the computer 7 by the web tension measuring roller 5 via the sensor 6 is used for controlling the speed of the motor 9 for the film roll 4.
  • the corresponding target value for the characteristic of the film hardness when the film roll grows is stored in the computer 7.
  • the motor 8 of the contact roller 2 which only has the function of a feed roller during slit winding, is regulated in its torque in such a way that it compensates for the mass of the contact roller 2 and the friction of the contact drive and this in accordance with the speed of the web running over this keeps turning without affecting the web.
  • the contact roller 2 operating in the nip mode thus does not exert any web tension on the supplied foil web 1.
  • the value determined by the web tension measuring roller 5 thus corresponds to the web tensile force which also exists between the contact roller 2 and the film roll 4. Since the characteristic of the winding hardness is achieved by regulating the speed of the film roll, the winding hardness of the film roll can be determined very sensitively.

Description

Die Erfindung betrifft eine Vorrichtung zum Aufwickeln einer Bahn, vorzugsweise einer im Blas- oder Gießverfahren hergestellten Kunststoffolienbahn, mit einer von einem elektrischen Wickelmotor angetriebenen Wickelhülse für die Bahn, mit einer den Bahnzug erfassenden Bahnzugmeßwalze, mit einer zwischen der Wickelhülse und der Bahnzugmeßwalze angeordneten, durch einen Elektromotor angetriebenen Kontaktwalze, die zum Kontaktwickeln an die sich bildende Folienrolle anstellbar ist und beim Spaltwickeln einen Abstand zur Folienrolle aufweist, und mit einer Regeleinrichtung zur Regelung der Motoren in Abhängigkeit der Zuführungsgeschwindigkeit der Bahn entsprechend der gemessenen Bahnzugkraft derart, daß die Wickelhärte der Wickelrolle in vorherbestimmbarer Weise beeinflußbar ist.The invention relates to a device for winding up a web, preferably a plastic film web produced by blowing or casting, with a winding tube for the web driven by an electric winding motor, with a web tension measuring roller detecting the web tension, with one arranged between the winding tube and the web tension measuring roller an electric motor driven contact roller, which is adjustable for contact winding on the film roll being formed and is at a distance from the film roll during gap winding, and with a control device for regulating the motors as a function of the feed speed of the web in accordance with the measured web tensile force such that the winding hardness of the winding roll in can be influenced in a predetermined manner.

Um zu verhindern, daß in Folienrollen die einzelnen Lagen in axialer Richtung auswandern oder austeleskopieren, was insbesondere dann geschehen kann, wenn sich zu Beginn eines Wickelvorgangs Luftpolster zwischen den einzelnen Lagen aufbauen, wird eine Wicklung in der Weise angestrebt, daß die Wickelhärte der Folienrollen von innen nach außen abnimmt. Bilden sich beispielsweise zu Beginn des Aufwickelns zwischen den einzelnen aufgewickelten Lagen Luftkissen aus, wird die eingeschlossene Luft bei zunehmendem Rollendurchmesser herausgedrückt, so daß die Gefahr besteht, daß gleichzeitig mit dem Ausquetschen der Luft auch einzelne Lagen seitlich auswandern. Dies kann zu einem derartigen Austeleskopieren der einzelnen Folienlagen führen, daß die Folienrolle nicht mehr verwendet werden kann und damit Ausschuß wird.In order to prevent the individual layers in film rolls from migrating or telescoping in the axial direction, which can happen in particular if air cushions build up between the individual layers at the start of a winding process, a winding is sought in such a way that the winding hardness of the film rolls of decreases inside out. Form, for example, at the beginning of the winding between the individual coils If there are air cushions, the enclosed air is pushed out as the roll diameter increases, so that there is a risk that, at the same time as the air is squeezed out, individual layers migrate laterally. This can lead to telescoping of the individual film layers in such a way that the film roll can no longer be used and is therefore rejected.

Anhand der schematischen Darstellung in Fig. 1 wird nun eine bekannte Wickelvorrichtung der eingangs angegebenen Art mit zugehöriger Regelung beschrieben, mit der sich Wickelrollen herstellen lassen, deren Wickelhärte in vorherbestimmbarer Weise beeinflußbar ist.Based on the schematic representation in Fig. 1, a known winding device of the type specified at the outset with associated control will now be described, with which winding rolls can be produced, the winding hardness of which can be influenced in a predetermined manner.

Die Fig. 1 zeigt einen sogenannten Kontakt-Zentralwickler. Bei dieser Wickelvorrichtung wird die aufzuwickelnde Bahn 1 über eine Kontaktwalze 2 der Wickelhülse 3 bzw. der sich auf dieser bildenden Folienrolle 4 zugeführt und zu der Folienrolle 4 aufgewickelt, wobei die Kontaktwalze an den Umfang der sich bildenden Folienrolle 4 angestellt ist. Vor der Kontaktwalze ist eine Bahnzugmeßwalze 5 angeordnet, welche den Bahnzug der auf die Kontaktwalze 2 auflaufenden Folienbahn mißt. Die Bahnzugmeßwalze 5 bildet eine Bahnschlaufe oder lenkt die Bahn 1 um, so daß sich aus dem von dem zulaufenden und dem ablaufenden Trum der Bahn auf die Bahnzugmeßwalze 5 ausgeübten Zug die Bahnzugkraft bestimmen läßt. Der Bahnzugmeßwalze 5 ist ein Meßwertaufnehmer 6 zugeordnet, der ein dem jeweils gemessenen Bahnzug entsprechendes Signal einer Regelungseinrichtung, beispielsweise einem Rechner 7, zuführt. Dieser Rechner 7 vergleicht das von dem Meßwertaufnehmer 6 erhaltene Signal als Istwert-Signal mit einem in dem Rechner 7 gespeicherten Sollwert-Signal. Unterscheiden sich beide Signale voneinander, wird der die Kontaktwalze 2 antreibende Gleichstrommotor 8 im positiven oder negativen Sinn drehzahlgeregelt, und zwar in der Weise, daß das von dem Meßwertaufnehmer 6 dem Rechner zugeführte Istwert-Signal dem Sollwert-Signal entspricht.1 shows a so-called contact central winder. In this winding device, the web 1 to be wound is fed via a contact roller 2 to the winding tube 3 or the film roll 4 forming thereon and wound up to form the film roll 4, the contact roller being set against the circumference of the film roll 4 forming. A web tension measuring roller 5 is arranged in front of the contact roller and measures the web tension of the film web running onto the contact roller 2. The web tension measuring roller 5 forms a web loop or deflects the web 1, so that the web tension can be determined from the tension exerted by the incoming and outgoing run of the web on the web tension measuring roller 5. The web tension measuring roller 5 is assigned a measuring sensor 6, which supplies a signal corresponding to the web tension measured in each case to a control device, for example a computer 7. This computer 7 compares the signal received by the transducer 6 as an actual value signal with a setpoint signal stored in the computer 7. If the two signals differ from one another, the direct current motor 8 driving the contact roller 2 is speed-controlled in a positive or negative sense, specifically in such a way that the sensor 6 the actual value signal supplied to the computer corresponds to the setpoint signal.

Da sich die Folienrolle 4 mit zunehmender Wickelzeit in ihrem Durchmesser vergrößert, muß der die Hülse 3 und die sich auf dieser bildende Wickelrolle antreibende Motor 9 ebenfalls entsprechend dem wachsenden Durchmesser der Folienrolle 4 geregelt werden. Dies geschieht dadurch, daß der Hülse 3 bzw. den die Hülse 3 tragenden Dornen oder Wellenzapfen ein Sensor 10 zugeordnet ist, welcher über die gezählten Umdrehungen der Hülse 3 den jeweiligen Ist-Durchmesser der Folienrolle 4 ermittelt. Dieser Wert ist ein Maß zur Änderung des Drehmoments des Wickelmotors 9. Der Wickelmotor 9 wird demzufolge in seinem Drehmoment geregelt. Dies bedeutet, daß das Drehmoment des Motors 9 entsprechend dem Durchmesser der sich bildenden Wickelrolle und der gewünschten Wickelcharakteristik geändert wird, während der die Kontaktwalze 2 antreibende Motor 8 in seiner Drehzahl geregelt wird.Since the film roll 4 increases in diameter with increasing winding time, the motor 3 driving the sleeve 3 and the winding roll forming on this must also be regulated according to the growing diameter of the film roll 4. This is done by assigning a sensor 10 to the sleeve 3 or the mandrels or shaft journals carrying the sleeve 3, which sensor 10 determines the actual diameter of the film roll 4 via the number of revolutions of the sleeve 3. This value is a measure of the change in the torque of the winding motor 9. The winding motor 9 is therefore regulated in its torque. This means that the torque of the motor 9 is changed in accordance with the diameter of the winding roll forming and the desired winding characteristic, while the speed of the motor 8 driving the contact roller 2 is regulated.

Anhand der Fig. 1 ist vorstehend eine als Kontakt-Zentralwickler arbeitende Wickeleinrichtung beschrieben worden, bei der sowohl die Kontaktwalze als auch die Wickelhülse angetrieben und ständig miteinander im Kontakt sind.1, a winding device working as a contact central winder has been described above, in which both the contact roller and the winding tube are driven and are in constant contact with one another.

Eine andere Betriebsweise besteht darin, daß die Kontaktwalze 2 von der Hülse 3 bzw. der sich auf dieser bildenden Wickelrolle 4 abgerückt ist und einen Abstand zu dieser aufweist. Eine derartige Wicklung wird als sogenanntes "Zentral-Spaltwickeln" bezeichnet. Diese Betriebsweise wird immer dann bevorzugt eingesetzt, wenn sehr empfindliche Folien aufgewickelt werden müssen, die unter dem Kontaktdruck seitens der Kontaktwalze leiden würden.Another mode of operation is that the contact roller 2 has moved away from the sleeve 3 or the winding roll 4 forming on it and is at a distance from it. Such a winding is referred to as so-called "central gap winding". This mode of operation is always used when very sensitive foils have to be wound up which would suffer from the contact pressure on the part of the contact roller.

Erfolgt das Wickeln der Wickelrollen durch Zentral-Spaltwickeln in bekannter Weise, werden der Wickelmotor 8 und der die Kontaktwalze 2 antreibende Motor 9 in der zuvor beschriebenen Weise geregelt. Eine andere Art der Regelung wurde bisher nicht für möglich gehalten, weil der Bahnzug zwischen der Hülse 3 bzw. der sich auf dieser bildenden Folienrolle 4 und der von dieser abgerückten Kontaktwalze nicht gemessen werden kann, weil in dem Übergangsbereich keine Meßeinrichtungen untergebracht werden können. Wird also die anhand der Fig. 1 beschriebenen bekannte Wickelvorrichtung als Zentral-Spaltwickler betrieben, wird der Wickelmotor 9 entsprechend dem sich vergrößernden Durchmesser der sich bildenden Wickelrolle 4 in seinem Drehmoment in der Weise geregelt, daß sich die gewünschte Wickelcharakteristik ergibt. Über eine Drehmomentregelung des Wickelmotors läßt sich die gewünschte Wickelcharakteristik aber nur sehr ungenau erreichen, so daß die Drehmomentregelung des Wickelmotors den gestiegenen Anforderungen an die Charakteristik der Wickelhärte bei Wickelrollen mit empfindlicheren Folienarten nicht mehr gerecht wird.The winding rolls are wound by central gap winding in a known manner, the winding motor 8 and the motor 9 driving the contact roller 2 are regulated in the manner described above. Another type of control was previously not considered possible because the web tension between the sleeve 3 or the film roll 4 formed on this and the contact roller moved away from it cannot be measured because no measuring devices can be accommodated in the transition area. If the known winding device described with reference to FIG. 1 is operated as a central slit winder, the winding motor 9 is regulated in its torque in accordance with the increasing diameter of the winding roll 4 that is formed in such a way that the desired winding characteristic results. However, the desired winding characteristic can only be achieved very imprecisely via a torque control of the winding motor, so that the torque control of the winding motor no longer meets the increased requirements for the characteristic of the winding hardness in winding rolls with more sensitive types of film.

Aufgabe der Erfindung ist es daher, eine Vorrichtung der eingangs angegebenen Art zu schaffen, mit der sich beim Zentral-Spaltwickeln auch empfindlichere Folien zu Folienrollen aufwickeln lassen, in denen in einer den empfindlicheren Folienarten entsprechenden Weise die Wickelhärte beeinflußbar ist.The object of the invention is therefore to provide a device of the type mentioned at the outset, with which even more sensitive films can be wound into film rolls in the central gap winding, in which the winding hardness can be influenced in a manner corresponding to the more sensitive types of film.

Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der gattungsgemäßen Art durch die Merkmale des kennzeichnen den Teils des Anspruchs 1 gelöst und insbesondere dadurch gelöst, daß die Regeleinrichtung mit einer Umschaltung versehen ist, durch welche beim Kontakt-Zentralwickeln das Drehmoment des Wickelmotors entsprechend dem zunehmenden Wickelrollendurchmesser geregelt und die Kontaktwalze mit einer der Bahnzugkraft entsprechenden Drehzahl angetrieben ist, und beim Spalt-Zentralwickeln der Wickelmotor entsprechend der gemessenen Bahnzugkraft drehzahlgeregelt ist. Eine feinfühlige Aufwickelung einer Bahn, vorzugsweise einer Kunststoffolienbahn, zu einer Folienrolle mit gewünschter Charakteristik der Wickelhärte läßt sich dann erreichen, wenn die Wickelrolle mit einer Drehzahl angetrieben wird, die entsprechend der Bahnzugkraft der auf die Folienrolle auflaufenden Bahn geregelt wird. Durch eine derartige Regelung der jeweiligen Wickelhärte läßt sich die Spannung bzw. Bahnzugkraft, mit der jede einzelne Lage gewickelt wird, feinfühlig bestimmen und der gewünschten Wickelcharakteristik anpassen. Durch eine derartige Regelung der Wickelhärte durch eine Drehzahlregelung des Wickelmotors lassen sich Ungenauigkeiten bei der Wickelhärte vermeiden, die sich aus einer Momentenregelung des Wickelmotors ergeben, weil eine derartige Momentenregelung nicht nur wegen der Trägheiten, sondern auch wegen der nur groben Einstellungsmöglichkeit der unterschiedlichen Momente über den Wickelrollendurchmesser zwangsläufig ungenau sein muß.According to the invention, this object is achieved in a device of the generic type by the features of characterizing the part of claim 1 and in particular by the fact that the control device is provided with a switchover by which central contact winding occurs the torque of the winding motor is regulated in accordance with the increasing winding roll diameter and the contact roller is driven at a speed corresponding to the web tensile force, and in the case of central gap winding the winding motor is speed-regulated in accordance with the measured web tensile force. A sensitive winding of a web, preferably a plastic film web, to a film roll with the desired characteristic of the winding hardness can be achieved if the winding roll is driven at a speed which is regulated in accordance with the tensile force of the web running onto the film roll. By regulating the respective winding hardness in this way, the tension or web tension with which each individual layer is wound can be determined sensitively and adapted to the desired winding characteristic. By regulating the winding hardness in this way by regulating the rotational speed of the winding motor, inaccuracies in the winding hardness that result from torque regulation of the winding motor can be avoided, because such a torque regulation is not only due to the inertia, but also because of the only rough adjustment possibility of the different moments over the Winding roll diameter must necessarily be inaccurate.

Bei der erfindungsgemäßen Vorrichtung läßt sich insbesondere dann über eine Drehzahlregelung des Wickelmotors eine feinfühlige Anpassung der Wickelhärte an die gewünschte Wickelcharakteristik erzielen, wenn der Einfluß der Kontaktwalze auf die Bahnzugkraft eliminiert werden kann. Nach einer bevorzugten Ausführungsform der Erfindung ist daher vorgesehen, daß beim Spalt-Zentralwickeln der Motor der einen Spalt zur Wickelrolle aufweisenden Kontaktwalze derart drehmomentgeregelt ist, daß das Motormoment die Trägheit der Kontaktwalze kompensiert. Nach dieser Ausgestaltung vermag also die Trägheit der Kontaktwalze die von der Bahnzugmeßwalze gemessene Bahnzugkraft nicht mehr zu verändern, so daß die mit Hilfe der Bahnzugmeßwalze gemessene Bahnzugkraft feinfühlig zur Regelung der Drehzahl des Wickelmotors verwendet werden kann. Zusätzlich können bei der Drehmomentregelung des Motors der Kontaktwalze auch Reibungseinflüsse berücksichtigt und kompensiert werden.In the device according to the invention, a sensitive adjustment of the winding hardness to the desired winding characteristic can be achieved in particular via a speed control of the winding motor if the influence of the contact roller on the web tensile force can be eliminated. According to a preferred embodiment of the invention, it is therefore provided that, in the case of central gap winding, the motor of the contact roller having a gap to the winding roller is torque-controlled in such a way that the motor torque compensates for the inertia of the contact roller. According to this embodiment, the inertia of the contact roller can no longer change the web tension measured by the web tension measuring roller, so that the web tension measured with the help of the web tension measuring roller can be used sensitively to regulate the speed of the winding motor. In addition, frictional influences can be taken into account and compensated for in the torque control of the motor of the contact roller.

Die erfindungsgemäße Vorrichtung läßt sich somit sowohl als Kontakt-Zentralwickler als auch als Spalt-Zentralwickler einsetzen, wobei bei Kontakt-Zentralwicklern der Motor der Wickelrolle drehmomentgeregelt und der Motor der Kontaktwalze drehzahlgeregelt ist und beim Spalt-Zentralwickeln eine Drehzahlregelung des Wickelmotors und eine Drehmomentregelung der Kontaktwalze lediglich in der Weise erfolgt, daß diese keine Rückwirkung mehr auf die Bahnzugkraft hat. Eine entsprechende Umschaltung der Motoren auf die unterschiedlichen Betriebsweisen läßt sich in einfacher Weise durch die Regelungseinheit bewirken.The device according to the invention can thus be used both as a contact central winder and as a gap central winder, the contact roller winding motor being torque-controlled and the contact roller motor being speed-controlled and the central winding winding speed control of the winding motor and torque control of the contact roller only in such a way that this no longer has any effect on the web tension. A corresponding switchover of the motors to the different operating modes can be effected in a simple manner by the control unit.

Zweckmäßigerweise sind der Wickelmotor und der Motor der Kontaktwalze Gleichstrommotoren, weil sich diese in besonders einfacher Weise in ihrem Drehmoment und ihrer Drehzahl regeln lassen. Bei Gleichstrommotoren ist das Drehmoment proportional zum Ankerstrom IA und die Drehzahl etwa proportional zur Ankerspannung UA. Bei der Drehmomentregelung wird die Bahn nur mit grob vorherbestimmbarer Bahnzugkraft auf die Wickelrolle aufgewickelt.The winding motor and the motor of the contact roller are expediently direct current motors because their torque and speed can be regulated in a particularly simple manner. In DC motors, the torque is proportional to the armature current I A and the speed is approximately proportional to the armature voltage U A. In torque control, the web is only wound onto the winding roll with a roughly predeterminable web tension.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Fig. 2, in der eine Wickelvorrichtung schematisch dargestellt ist, die von Kontakt-Zentralwickeln auf Spalt-Zentralwickeln und umgekehrt umstellbar ist, beschrieben.An embodiment of the invention is described below with reference to FIG. 2, in which a winding device is shown schematically, which can be converted from contact central winding to gap central winding and vice versa.

In der aus Fig. 2 ersichtlichen Betriebsweise arbeitet der Wickler als Kontakt-Zentralwickler, also in gleicher Weise wie die anhand der Fig. 1 beschriebene Wickelvorrichtung. Die Regelung in der aus Fig. 2 ersichtlichen Weise erfolgt somit in gleicher Weise wie die Vorrichtung nach Fig. 1, so daß für gleiche Teile der Vorrichtung nach Fig. 2 auch dieselben Bezugszahlen verwendet wurden wie in Fig. 1.In the operating mode shown in FIG. 2, the winder works as a contact central winder, that is to say in the same way as the winding device described with reference to FIG. 1. The control in the manner shown in FIG. 2 thus takes place in the same way as the device according to FIG. 1, so that the same reference numbers as in FIG. 1 have been used for the same parts of the device according to FIG. 2.

Wird nun die aus Fig. 2 ersichtliche Vorrichtung von der dargestellten Betriebsweise als Kontakt-Zentralwickler auf die Betriebsweise eines Spalt-Zentralwicklers umgeschaltet, weist die Kontaktwalze 2 stets einen Abstand oder Spalt zur Folienrolle 4 auf. Um auch in diesem Fall die Charakteristik der Wicklung der Folienrolle 4 feinfühlig bestimmen zu können, werden die Motoren 8 und 9 umgeschaltet, und zwar in der Weise, daß die Drehzahl des Motors 9 und das Drehmoment des Motors 8 geregelt werden. Bei dieser Betriebsweise wird also das von der Bahnzugmeßwalze 5 über den Meßwertaufnehmer 6 dem Rechner 7 zugeführte Signal für die Regelung der Drehzahl des Motors 9 für die Folienrolle 4 verwendet. Der entsprechende Sollwert für die Charakteristik der Folienhärte bei Anwachsen der Folienrolle ist in dem Rechner 7 gespeichert. Es findet ein ständiger Sollwert-IstwertVergleich statt, aufgrund dessen der Wickelmotor 9 in seiner Drehzahl geregelt wird.If the device shown in FIG. 2 is now shown Mode of operation as a contact central winder switched to the mode of operation of a nip central winder, the contact roller 2 is always at a distance or nip from the film roll 4. In order to be able to determine the characteristic of the winding of the film roll 4 sensitively in this case as well, the motors 8 and 9 are switched over, in such a way that the speed of the motor 9 and the torque of the motor 8 are regulated. In this mode of operation, the signal fed to the computer 7 by the web tension measuring roller 5 via the sensor 6 is used for controlling the speed of the motor 9 for the film roll 4. The corresponding target value for the characteristic of the film hardness when the film roll grows is stored in the computer 7. There is a constant setpoint-actual value comparison, on the basis of which the winding motor 9 is regulated in its speed.

Der Motor 8 der Kontaktwalze 2, die beim Spaltwickeln nur noch die Funktion einer Zuführungsrolle hat, wird in der Weise in seinem Drehmoment geregelt, daß er die Masse der Kontaktwalze 2 und die Reibung des Kontaktantriebes kompensiert und diese entsprechend der Geschwindigkeit der über diese laufenden Bahn in Drehung hält, ohne eine Rückwirkung auf die Bahn auszuüben. Die im Spaltbetrieb arbeitende Kontaktwalze 2 übt somit keinen Bahnzug auf die zugeführte Folienbahn 1 aus. Der von der Bahnzugmeßwalze 5 ermittelte Wert entspricht somit der Bahnzugkraft, die auch zwischen der Kontaktwalze 2 und der Folienrolle 4 herrscht. Da also die Charakteristik der Wickelhärte über eine Drehzahlregelung der Folienrolle erfolgt, läßt sich die Wickelhärte der Folienrolle sehr feinfühlig bestimmen.The motor 8 of the contact roller 2, which only has the function of a feed roller during slit winding, is regulated in its torque in such a way that it compensates for the mass of the contact roller 2 and the friction of the contact drive and this in accordance with the speed of the web running over this keeps turning without affecting the web. The contact roller 2 operating in the nip mode thus does not exert any web tension on the supplied foil web 1. The value determined by the web tension measuring roller 5 thus corresponds to the web tensile force which also exists between the contact roller 2 and the film roll 4. Since the characteristic of the winding hardness is achieved by regulating the speed of the film roll, the winding hardness of the film roll can be determined very sensitively.

Um die erfindungsgemäße Vorrichtung vom Kontaktwickeln auf Spaltwickeln umzustellen, ist es lediglich erforderlich, die Regelungseinrichtung bzw. den Rechner 7 mit einer Umschaltung 11 zu versehen, durch welche einmal eine Momentenregelung des Motors 9 und eine Drehzahlregelung des Motors 8 und im Spaltbetrieb eine Drehzahlregelung des Motors 9 und eine Momentenregelung des Motors 8 erfolgt.To switch the device according to the invention from contact winding to slit winding, it is only necessary to switch the control device or the computer 7 with a switch 11 provided by which a torque control of the motor 9 and a speed control of the motor 8 and, in split mode, a speed control of the motor 9 and a torque control of the motor 8 take place.

Claims (3)

  1. A device for the winding up of a web, preferably a plastic film web, produced in an inflation extrusion process or casting process,
    with a winding tube for the web, driven by an electric winding motor,
    with a web-tension measuring roller registering the web tension,
    with a contact roller arranged between the winding tube and the roller measuring the web tension, driven by an electric motor, which can be applied for the contact winding to the roll of film being formed, and which is interspaced from the film roll in the case of gap winding, and
    with a control device for controlling the motors in dependence on the speed of feeding the web, according to the measured force of the web tension in such a way that the roll hardness of the wound roll can be influenced in a predeterminable way,
    characterized in that
    the control device is provided with a change-over device (11) by means of which the torque of the winding motor (9) is, in the case of contact winding, controlled according to the increasing diameter of the wound roll and the contact roller (2) is driven at a rotational speed corresponding to the force of the web tension, and in the case of gap winding, the rotational speed of the winding motor (9) is controlled according to the measured force of the web tension.
  2. A device according to claim 1, characterized in that in the case of gap winding, the torque of the motor (8) of the contact roller (2) disposed with a gap from the wound roll (4) is controlled in such a way that the motor torque compensates the inertia of the contact roller (2) and the friction of the contact drive.
  3. A device according to claim 1 or 2, characterized in that the motors (8, 9) for driving the winding tube (3) and the contact roller (2) are direct current motors.
EP93115574A 1992-10-19 1993-09-27 Web winding device Expired - Lifetime EP0593946B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE9214095 1992-10-19
DE9214095U 1992-10-19
DE9216261U DE9216261U1 (en) 1992-10-19 1992-11-30 Device for winding a web
DE9216261U 1992-11-30

Publications (3)

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EP0593946A2 EP0593946A2 (en) 1994-04-27
EP0593946A3 EP0593946A3 (en) 1995-11-02
EP0593946B1 true EP0593946B1 (en) 1996-11-27

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EP93115574A Expired - Lifetime EP0593946B1 (en) 1992-10-19 1993-09-27 Web winding device

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US (1) US5437417A (en)
EP (1) EP0593946B1 (en)
DE (2) DE9216261U1 (en)

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Also Published As

Publication number Publication date
US5437417A (en) 1995-08-01
DE9216261U1 (en) 1994-02-24
DE59304602D1 (en) 1997-01-09
EP0593946A3 (en) 1995-11-02
EP0593946A2 (en) 1994-04-27

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