WO2021074231A1 - Module pour réduire la tension d'une bande de matière, installation de soufflage de film de matière et procédé de réalisation d'un film de matière - Google Patents

Module pour réduire la tension d'une bande de matière, installation de soufflage de film de matière et procédé de réalisation d'un film de matière Download PDF

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Publication number
WO2021074231A1
WO2021074231A1 PCT/EP2020/078914 EP2020078914W WO2021074231A1 WO 2021074231 A1 WO2021074231 A1 WO 2021074231A1 EP 2020078914 W EP2020078914 W EP 2020078914W WO 2021074231 A1 WO2021074231 A1 WO 2021074231A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
film
film web
web tension
module
Prior art date
Application number
PCT/EP2020/078914
Other languages
German (de)
English (en)
Inventor
Tim Kirchhoff
René Schuh
Original Assignee
Windmöller & Hölscher Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Windmöller & Hölscher Kg filed Critical Windmöller & Hölscher Kg
Publication of WO2021074231A1 publication Critical patent/WO2021074231A1/fr

Links

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
    • 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
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2518—Projection by scanning of the object
    • G01B11/2522—Projection by scanning of the object the position of the object changing and being recorded
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G01B11/306—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces for measuring evenness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/30—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring roughness or irregularity of surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined

Definitions

  • Web-shaped materials represent the quality-determining basis for many post-processing processes.
  • the quality of material webs is essentially determined by their production and further processing. In most extrusion processes, several raw materials go through a complex process chain.
  • Quality criteria in the production of web-shaped materials include web width (film width), web thickness (film thickness) and flatness.
  • film width film width
  • film thickness film thickness
  • flatness flatness
  • a possible inline measurement and control of quality-influencing parameters offers a high potential for quality assurance and resource saving. While film width and film thickness are already continuously recorded, there is still no reliable system for inline measurement of flatness. Even if there are already systems there are, the results of subsequent measurements often differ from the results of inline measurements.
  • the object of the present invention is therefore to propose a device and a method with which the flatness of a film web can be measured more reliably inline.
  • the object is achieved by a module for achieving and / or maintaining a defined web tension of a film web with the features of claim 1.
  • Module for achieving and / or maintaining a defined web tension of a film web, in particular a reduced web tension of the film web, for determining quality properties
  • a preferred quality property of the film web can be the quality of the flatness, which is often described as a deviation of the fleas of the film web from an ideal surface or as differences in length over the transverse direction of the film web.
  • a measuring device for measuring the flatness can have different characteristics. For example, a measuring device that works on an optical basis is possible, such as a flea measurement by means of laser triangulation.
  • the flatness is usually inherent in the film after it has cooled down and can often only be corrected partially or not at all afterwards.
  • the module according to the invention initially comprises an infeed roller and an actuator arranged downstream for impressing a web tension on the film web.
  • the actuator is preferably an actuator roller which is driven by means of a drive. The drive impresses a speed and / or a torque on the roller which defines the tensile force on the film web which leads to the web tension of the film web.
  • At least one sensor is provided with which the web tension of the film web can be measured.
  • a sensor can be arranged in the path of the film web in front of or behind the actuator, but an arrangement in front of the actuator is preferred.
  • the web tension value detected by the sensor can be transmitted to a controller via a data connection.
  • the sensor is preferably designed as a web tension measuring roller or as a pendulum roller.
  • the controller now compares the web tension value detected by the sensor with a target value for the web tension. If the difference in such a value is outside a tolerance value, the controller controls the drive of the actuator in such a way that the difference becomes smaller.
  • the acquisition, comparison and control take place several times in succession, preferably at regular time intervals.
  • a contact roller can be provided which presses with a force on the part of the actuator roller wrapped by the film web, so that the film web is pressed against the actuator roller with a force.
  • the film web wraps around the actuator roller over a wrap angle between 90 degrees and 270 degrees, in particular between 90 and 200 degrees.
  • the infeed roller is a roller which is acted upon by a force and which is arranged upstream of the actuator and with regard to it Peripheral speed is controllable.
  • This infeed roller thus provides a counterforce to the actuator.
  • the sensor is preferably arranged in the running direction between the infeed roller and the actuator roller. It is also possible to provide further web guiding elements such as web guiding or deflecting rolls between the infeed roll and the actuator roll.
  • the web tension can be set independently of the web tensions that act on the film web upstream and / or downstream.
  • a high web tension leads to the fact that the film web is pulled "smoothly" and the measurement result of the flatness does not reflect the true flatness.
  • the lowest possible web tension can be set, which improves the results of a flatness measurement. For example, the flatness (differences in length over the transverse direction of the web) of a film web is only visible when the web tension falls below a certain value.
  • a completely tension-free state of the web is ideal for analyzing the flatness, i.e. a web tension of 0 N / mm 2 is not realistic in the ongoing extrusion process, as a certain web tension is necessary for the film transport. It is therefore advantageous to provide a web tension of greater than 0.01 N / mm 2 .
  • the web tension is preferably less than 10 N / mm 2 , in particular less than 1 N / mm 2 .
  • a film manufacturing device for manufacturing a film web with at least one extruder for providing a melt-like one
  • an extrusion nozzle with a nozzle gap in particular a blow head with a circumferential nozzle gap, with which the melt-shaped Plastic can be converted into a film bubble or film web emerging from the nozzle gap
  • a measuring device for measuring the quality property is provided in or on the module.
  • a module according to the invention for achieving and / or maintaining a defined web tension of a film web can consequently be combined with such a film production device.
  • the Fier ein it is necessary to pull the film web with at least one take-off roller from the nozzle gap. Since the film web is often stretched longitudinally at the same time, high tensile forces are required, so that it is not possible to reliably measure quality criteria, in particular the flatness. It is therefore advantageous to provide the module behind the take-off roller to achieve and / or maintain a defined web tension of a film web.
  • the web tension can then be set to a value above 0.1 N / mm 2 , but below the web tension which is impressed by a web tension by means of devices arranged upstream for impressing.
  • the module for achieving and / or maintaining a defined web tension of a film web after an optional reversing device and / or a separate longitudinal stretching device (MDO unit). Will be a double layer If the film web is provided by the film production device, it is advantageous to separate the two layers and continue them on different web travel paths.
  • two modules can be provided for achieving and / or maintaining a defined web tension of a film web, so that the quality properties can be determined separately for each film layer. Both modules then work independently of one another, ie that the web tensions in particular can be set independently of one another.
  • the above-mentioned object is also achieved by a method according to claim 4.
  • the subject of this claim is a method for producing a film web in which
  • a molten plastic is provided with at least one extruder
  • the film bubble is formed into a double-layer film web, with the two layers touching at least partially and in particular essentially over the entire surface,
  • a web tension of the film web is set at any point downstream of one of the lay-flat devices to determine quality properties, with the Quality property of the film web is measured.
  • the single FIGURE shows a module 1 according to the invention for achieving and / or maintaining a defined web tension of a film web 2.
  • the film web 2 is transported in the direction of the transport path z via a feed 52, which can be driven.
  • a nip which is formed by the rollers 54 and 55, is passed through by the film web.
  • At least one of these rollers 54, 55 represents the infeed roller of the module 1.
  • the film web is represented by a broken line and has the reference number 3 in this area. This fact indicates that the web tension of the film web is in this area is influenced and differs in particular from the web tension upstream and / or downstream.
  • the film web 3 runs over the roller 6, through which the film web can be subjected to a tensile force.
  • the roller 6 is driven by means of a speed- and / or torque-controlled drive.
  • the speed or the torque are specified by the controller 4.
  • a pressure roller 7 is positioned against the roller 6, so that the flattening of the film web 3 on the roller 6 can be improved. Slippage is thus avoided.
  • the film web 3 leaves the roller 6 in the direction of the arrow which is marked with WST.
  • This means that the film web is wound into a roll, for example on a winding point (not shown).
  • the web tension that the film web has in the area between the roller 55 and the roller 6 is determined by means of a sensor 5.
  • this sensor 5 is designed as a web tension measuring roller by way of example.
  • the web tension measured by this sensor is fed to the controller 4 as a measured value. This compares this measured value with a predetermined target value for the web tension and controls the drive of the roller 6 if the deviation is too great, resulting in a changed speed or a changed torque.
  • the nominal value for the web tension can be generated by a nominal value generator.
  • This setpoint generator can take into account at least one of the following influencing parameters when generating a setpoint:
  • Reference numeral 45 denotes a measuring device for detecting the quality property of the film web as part of the module 1, which preferably carries out an optical measurement of the film, in particular a laser triangulation measurement for detecting the flatness of the film web.
  • the measuring device records the quality property of the film web in the area between the rollers 55 and 6.
  • the module 1 is shown as being present twice, the double representation indicating a further embodiment of the invention.
  • the film web 2 is supplied as a double-layer web.
  • Each layer is fed to a module 1 after leaving the nip formed by the rollers 54, 55, so that the Quality property of each layer of the film web can be recorded independently of one another.
  • both film webs 3 can also be wound up on separate rolls.

Landscapes

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

L'invention concerne un module permettant d'obtenir et/ou de maintenir une tension définie d'une bande de matière, notamment une tension réduite de la bande de matière, en un emplacement quelconque en aval d'un dispositif d'application à plat pour déterminer des propriétés de qualité, le module comprenant : un actionneur pour appliquer une tension de bande de matière ; un capteur pour déterminer la tension de bande de matière courante ; un dispositif de réglage pour commander l'actionneur afin de maintenir la tension de bande de matière à une valeur théorique, un dispositif de mesure destiné à mesurer la propriété de qualité se trouvant dans ou sur le module.
PCT/EP2020/078914 2019-10-14 2020-10-14 Module pour réduire la tension d'une bande de matière, installation de soufflage de film de matière et procédé de réalisation d'un film de matière WO2021074231A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019215794.7A DE102019215794A1 (de) 2019-10-14 2019-10-14 Modul zur Bahnspannungsabsenkung, Blasfolienanlage und Verfahren zur Herstellung einer Folie
DE102019215794.7 2019-10-14

Publications (1)

Publication Number Publication Date
WO2021074231A1 true WO2021074231A1 (fr) 2021-04-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/078914 WO2021074231A1 (fr) 2019-10-14 2020-10-14 Module pour réduire la tension d'une bande de matière, installation de soufflage de film de matière et procédé de réalisation d'un film de matière

Country Status (2)

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DE (1) DE102019215794A1 (fr)
WO (1) WO2021074231A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015006891A1 (de) * 2015-06-03 2016-09-01 Reifenhäuser GmbH & Co. KG Maschinenfabrik Anlage zum Herstellen einer Folienbahn sowie Verfahren zum Betreiben einer solchen Anlage
DE102017006818A1 (de) * 2016-09-13 2018-03-15 Reifenhäuser GmbH & Co. KG Maschinenfabrik Messvorrichtung zum Messen einer zwei- oder dreidimensionalen Folientopografie, Anlage zum Herstellen einer Folienbahn, Verfahren zum inline-Mustererkennen von Fehlerbildern in einer zwei-oder dreidimensionalen Folientopografie. Verfahren zum Steuern des Herstellverfahrens einer Folienbahn zum Verhindern von Fehlerbildern, Verfahren zum Regeln des Herstellverfahrens einer Folienbahn zum Verhindern von Fehlerbildern, Verfahren zur inline-Planlagebestimmung, Anlage zum Herstellen einer Folienbahn sowie Verfahren zum inline-Bestimmen eines ersten Fehlers, insbesondere Planlagefehlers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015006891A1 (de) * 2015-06-03 2016-09-01 Reifenhäuser GmbH & Co. KG Maschinenfabrik Anlage zum Herstellen einer Folienbahn sowie Verfahren zum Betreiben einer solchen Anlage
DE102017006818A1 (de) * 2016-09-13 2018-03-15 Reifenhäuser GmbH & Co. KG Maschinenfabrik Messvorrichtung zum Messen einer zwei- oder dreidimensionalen Folientopografie, Anlage zum Herstellen einer Folienbahn, Verfahren zum inline-Mustererkennen von Fehlerbildern in einer zwei-oder dreidimensionalen Folientopografie. Verfahren zum Steuern des Herstellverfahrens einer Folienbahn zum Verhindern von Fehlerbildern, Verfahren zum Regeln des Herstellverfahrens einer Folienbahn zum Verhindern von Fehlerbildern, Verfahren zur inline-Planlagebestimmung, Anlage zum Herstellen einer Folienbahn sowie Verfahren zum inline-Bestimmen eines ersten Fehlers, insbesondere Planlagefehlers

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Publication number Publication date
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