EP1539458A1 - Device for the production of self-cleaning films according to the blow-molding method - Google Patents

Device for the production of self-cleaning films according to the blow-molding method

Info

Publication number
EP1539458A1
EP1539458A1 EP03794915A EP03794915A EP1539458A1 EP 1539458 A1 EP1539458 A1 EP 1539458A1 EP 03794915 A EP03794915 A EP 03794915A EP 03794915 A EP03794915 A EP 03794915A EP 1539458 A1 EP1539458 A1 EP 1539458A1
Authority
EP
European Patent Office
Prior art keywords
film
control unit
sections
film tube
particles
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.)
Withdrawn
Application number
EP03794915A
Other languages
German (de)
French (fr)
Inventor
Martin Backmann
Klemens Sensen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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 Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP1539458A1 publication Critical patent/EP1539458A1/en
Withdrawn legal-status Critical Current

Links

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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/87—Cooling
    • 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
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle 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
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/865—Heating
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • 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
    • B29C2948/92114—Dimensions
    • B29C2948/92152—Thickness
    • 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
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone

Definitions

  • the invention relates to a device for producing blown film tubes, which are at least equipped with a self-cleaning surface.
  • Devices for producing blown film tubes are generally known.
  • Devices of this type comprise an extruder in which a plastic melt is formed and a blow head which has an annular outlet gap from which the plastic melt is extruded to form a film tube.
  • the known devices for producing blown film hoses comprise means for generating a pressure difference between the inside and the outside of the hose, which widens the film hose after leaving the annular gap.
  • the film tube In order to prevent the air generating the internal pressure from escaping, the film tube finally passes through a squeezing device, which usually consists of two squeezing rollers.
  • the patent specification EP 0 772 514 B1 describes a self-cleaning surface of objects, the surface structure being largely hydrophobic and having elevations. The dimensions of the diameters and the mutual spacing of the elevations lie within a selection range. It is possible to produce such a self-cleaning film in a blowing process by adding the particles required for forming the elevations - preferably nanoparticles - even before the plastic melt is extruded. Here, nanoparticles can be significantly smaller than a micrometer.
  • the self-cleaning surface can also be subjected to elevations by applying a particle, which is carried out after the extrusion.
  • the object of the present invention is therefore to develop a device which ensures that the self-cleaning properties of the blown film are retained.
  • the object is achieved in that a measuring device which examines at least sections of one of the peripheral surfaces of the film tube for the number of elevations per unit area or length is used.
  • the measuring device consists of a CCD camera or a device which has a light source which emits light onto the film and which additionally has an optical sensor which measures the light reflected or transmitted through the film.
  • This control unit is advantageously provided with means for adjusting the draw ratio R1 / R2, which is connected to the stretching of the film in the circumferential direction ( ⁇ ) is defined, and / or with means for adjusting the volume flow and controls these means in such a ', the number of the bumps that per Area or length unit approaches a target value.
  • the means for setting the volume flow and the stretching ratio can comprise different components.
  • Such components include heating or cooling units, which influence the temperature of the plastic melt and thus its viscosity in the blow head, as they are e.g. B. are shown in EP 0 425 797 A1.
  • Heating or cooling units can also be provided which influence the temperature of the film tube via cooling or heating media. This includes blowing air.
  • Such cooling units are such. B. in DE 42 07 439 A1 and DE 42 36 443 A1.
  • the volume flow can also be influenced by means of changing the volume flow of the cooling media.
  • a further means for adjusting the volume flow can be means for adjusting the width of the annular gap.
  • the publications mentioned are primarily concerned with influencing the viscosity of the plastic melt in sections, since the volume flow and the stretching ratio are to be regulated in sections.
  • a particularly preferred embodiment of the invention further comprises a means for measuring the thickness of the extruded blown film, as shown in DE 40 09 982.
  • a means for measuring the film thickness can comprise a capacitive sensor or an optical sensor which examines the reflected light or the absorbed light. This optical sensor can be identical to the measuring device.
  • the measurement results of the thickness measurement of the extruded film are also fed to the control unit.
  • the setpoints for the thickness and / or thickness tolerance of the film and the setpoints for the number of surveys per unit area or length are stored in this control unit.
  • the control unit controls the means for setting the volume flow in such a way that the measured variables of the film thickness and the number of particles per unit area or length approach the target values.
  • Prioritization can advantageously be carried out on the control unit, so that the control unit prefers the setting of the measured values of one of the two measured variables over the setting of the other measured variable.
  • a preferred embodiment of the invention contains means for extruding particles on at least one of the two surfaces of the film tube, wherein the amount of particles to be applied can be adjusted by control signals.
  • the means for extruding particles are advantageously connected to a control unit.
  • This control unit receives the measurement results from the measuring device and controls the means for extruding particles in such a way that the number of surveys per unit area or length approaches a target value.
  • material particles which are either solid particles, nanoparticles or small volumes of a melt which form elevations after cooling. Both the volume flow and the stretch ratio can be changed in sections with the same device components. If a device for the production of blown film hoses has a plurality of different of these device components, then the thickness setpoints and the number of elevations per unit area or length can be optimized independently of one another by a selective and different control. A circumferential section can thus be stretched by blowing in heating air, while an increase in the volume flow by widening the outlet gap ensures an independent setting, in particular for maintaining the film thickness.
  • a preferred method for producing a blown film tube that is provided with at least one self-cleaning surface comprises a method step in which at least sections of at least one of the peripheral surfaces of the film tube are examined for the number of elevations per unit area or length.
  • Fig. 2 section of a film tube with an uneven
  • the film blow head 2 is fed via a screw conveyor 1, the material to be extruded, which is filled in via a funnel.
  • the screw conveyor 1 is driven by a motor.
  • the material is melted in the film die 2 in a manner not shown and pressed into an annular gap, not shown.
  • the film tube 3 is extruded from this annular gap.
  • This film tube has elevations 10 on at least one surface.
  • the film tube 3 has a radius Ri, which is essentially identical to the radius of the annular gap.
  • the extrusion speed is labeled Vi.
  • the blown film 3 is expanded to a radius R in the further course, the imaginary central axis 5 of the film tube 3 being retained. So that the air ensuring the internal pressure cannot escape, the film tube 3 passes through a squeezing device 5, which consists of two squeezing rollers, between which the film runs. Of this pair of squeeze rollers, only the front squeeze roller 4 is visible.
  • the peripheral speed of the squeeze rollers V 2 can, however, be chosen differently than the extrusion speed V ,. As a result, the film tube is stretched (with V 2 > Vi). Immediately before the film tube 3 enters the squeezing device 5, the conveying speed of the film tube is also V 2 .
  • the radius R 2 can also be different in these areas, which has an effect on the number of surveys per unit area or length.
  • this number is determined with the measuring device 6.
  • the measuring device 6 is mounted in a frame in a manner not shown, so that a movement of the measuring device around the film tube in the direction of the double arrow A is possible.
  • the measurement results thus obtained are fed to an evaluation and control unit 7.
  • the evaluation and control unit compares the measurement results with a target value and controls the heating element 8 in such a way that a constant number of surveys per unit area or length results from the temperature distribution on the circumference of the film tube.
  • Such heating elements can be distributed over the entire film blowing head, but only the heating element 8 is shown as an example.
  • the evaluation and Control unit control the cooling and heating element 9 in order to be able to compensate for a regionally high temperature of the film tube.
  • a large number of cooling and heating elements 9 can form a cooling and heating ring, so that all areas of the film tube can be cooled and / or heated.
  • FIG. 2 shows a projection of a section 21 of a film tube, the width of which results from the radius R and the angular range considered in the circumferential direction ⁇ .
  • the area A has stretched too little in the circumferential direction, while the area has stretched too much in the circumferential direction ⁇ . This may be due to a too low (area A) and too high (area B) temperature of the plastic melt. Such uneven stretching over the circumference of the tube can also occur due to other circumstances. In any case, the uneven distribution of the elevations 10 in the cutout 21 shown in FIG. 2 is undesirable. Because of the problems described, the number of elevations 10 per unit length is observed in particular in the circumferential direction ⁇ of the film tube. Fig.
  • the section 24 shows a section 24 of a film tube 3, which 24 also has the width R 2 ⁇ .
  • the section 24 has uniform distances between the elevations 10. For this purpose, the number of surveys per unit area or length was measured, and on the basis of a comparison of this measured value with the target value, the temperature of the film tube section 22 was set such that the almost uniform distribution of the surveys per unit area or unit length is shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

Disclosed is a device for producing blown film tubes (3) that are provided with at least one self-cleaning surface. Said device has the following characteristics: - an extruder (1) supplying melted plastic; - a blow head (2) comprising an annular discharge gap; and - a squeezing device (4). The inventive device is characterized by the fact that it comprises a measuring device which analyzes how many elevations (10) occur per unit of area or unit of length in at least some sectors (22, 23) of at least one circumferential area (21) of the film tube (3).

Description

Vorrichtung zur Herstellung selbstreinigender Folien im BlasverfahrenDevice for the production of self-cleaning foils by blowing
Die Erfindung betrifft eine Vorrichtung zur Herstellung von Blasfolienschläuchen, welche zumindest mit einer selbstreinigenden Oberfläche ausgestattet sind.The invention relates to a device for producing blown film tubes, which are at least equipped with a self-cleaning surface.
Vorrichtungen zur Herstellung von Blasfolienschläuchen sind allgemein bekannt. Derartige Vorrichtungen umfassen einen Extruder, in dem eine Kunststoffschmelze gebildet wird und einen Blaskopf, der über einen ringförmigen Austrittsspalt verfügt, aus dem die Kunststoffschmelze zu einem Folienschlauch extrudiert wird. Des weiteren umfassen die bekannten Vorrichtungen zur Herstellung von Blasfolienschläuchen Mittel zur Erzeugung einer Druckdifferenz zwischen dem Schlauchinneren und -äußeren, die den Folienschlauch nach Verlassen des Ringspaltes aufweitet. Um das Entweichen der den Innendruck erzeugenden Luft zu verhindern, durchläuft der Folienschlauch schließlich eine Abquetschvorrichtung, die üblicherweise aus zwei Abquetschwalzen besteht.Devices for producing blown film tubes are generally known. Devices of this type comprise an extruder in which a plastic melt is formed and a blow head which has an annular outlet gap from which the plastic melt is extruded to form a film tube. Furthermore, the known devices for producing blown film hoses comprise means for generating a pressure difference between the inside and the outside of the hose, which widens the film hose after leaving the annular gap. In order to prevent the air generating the internal pressure from escaping, the film tube finally passes through a squeezing device, which usually consists of two squeezing rollers.
Um einen solchen Folienschlauch mit einer selbstreinigenden Oberfläche auszustatten, ist es notwendig, die Vorrichtung zu erweitern. So beschreibt die Patentschrift EP 0 772 514 B1 eine selbstreinigende Oberfläche von Gegenständen, wobei die Oberflächenstruktur im Großen und Ganzen hydrophob ist und Erhebungen aufweist. Die Maße der Durchmesser und gegenseitigen Abstände der Erhebungen liegen innerhalb eines Auswahlbereichs. Es ist möglich, eine solche selbstreinigende Folie im Blasverfahren herzustellen, indem die für Bildung der Erhebungen notwendigen Teilchen - vorzugsweise Nanopartikel - bereits vor der Extrusion der Kunststoff schmelze zugefügt werden. Hierbei können Nanopartikel deutlich kleiner als ein Micrometer sein. Die selbstreinigende Oberfläche kann jedoch auch durch einen Teilchenauftrag mit Erhebungen beaufschlagt werden, welcher nach der Extrusion vorgenommen wird.In order to provide such a film tube with a self-cleaning surface, it is necessary to expand the device. For example, the patent specification EP 0 772 514 B1 describes a self-cleaning surface of objects, the surface structure being largely hydrophobic and having elevations. The dimensions of the diameters and the mutual spacing of the elevations lie within a selection range. It is possible to produce such a self-cleaning film in a blowing process by adding the particles required for forming the elevations - preferably nanoparticles - even before the plastic melt is extruded. Here, nanoparticles can be significantly smaller than a micrometer. However, the self-cleaning surface can also be subjected to elevations by applying a particle, which is carried out after the extrusion.
Darüber hinaus ist es möglich, die Erhebungen aus entsprechenden kleinen Schmelzemengen, welche der Kunststoffschmelze oder dem bereits extrudierten Schlauch beigefügt werden, zu bilden.In addition, it is possible to form the elevations from corresponding small amounts of melt which are added to the plastic melt or the already extruded tube.
Bei der Durchführung dieses Verfahrens mit der zuvor beschriebenen Vorrichtung ergibt sich jedoch das Problem, dass der aus der Schmelze extrudierte Folienschlauch an verschiedenen Stellen seines Umfangs unterschiedliche Temperaturen aufweist. Bei der durch den Innendruck hervorgerufene Aufweitung kommt es daher vor, dass wärmere Bereiche deutlich stärker aufgeweitet werden als kühlere Bereiche. Die verschieden aufgeweiteten Bereiche weisen als Folge jedoch auch verschiedene Dichten an Erhebungen auf. Durch eine zu große Aufweitung der Folie und der daraus resultierende zu geringe Dichte an Erhebungen kann jedoch die selbstreinigende Eigenschaft der Blasfolie verloren gehen. Gleiches gilt für eine zu große Dichte an Erhebungen.When carrying out this method with the device described above, however, the problem arises that the film tube extruded from the melt has different temperatures at different points on its circumference. With the expansion caused by the internal pressure, it therefore happens that warmer areas are expanded significantly more than cooler areas. As a result, the differently widened areas also have different densities of elevations. The self-cleaning property of the blown film can, however, be lost if the film is expanded too much and the resulting low density of elevations. The same applies to an excessive density of surveys.
Aufgabe der vorliegenden Erfindung ist daher, eine Vorrichtung zu entwickeln, die sicherstellt, dass die selbstreinigenden Eigenschaften der Blasfolie erhalten bleiben.The object of the present invention is therefore to develop a device which ensures that the self-cleaning properties of the blown film are retained.
Die Aufgabe wird dadurch gelöst, dass eine Messvorrichtung, welche zumindest Abschnitte einer der Umfangsflächen des Folienschlauches auf die Anzahl der Erhebungen pro Flächen- oder Längeneinheit untersucht, eingesetzt wird. In einer bevorzugten Ausführungsform besteht die Messvorrichtung aus einer CCD-Kamera oder einer Vorrichtung, die über Lichtquelle verfügt, die Licht auf die Folie emittiert und die zusätzlich über einen optischen Sensor verfügt, der das reflektierte oder durch die Folie traπsmittierte Licht misst.The object is achieved in that a measuring device which examines at least sections of one of the peripheral surfaces of the film tube for the number of elevations per unit area or length is used. In a preferred embodiment, the measuring device consists of a CCD camera or a device which has a light source which emits light onto the film and which additionally has an optical sensor which measures the light reflected or transmitted through the film.
Weiterhin ist es vorteilhaft, die Messergebnisse einer Steuereinheit zuzuführen. Diese Steuereinheit ist vorteilhafterweise mit Mitteln zum Einstellen des Streckverhältnisses R1/R2, welches die Streckung der Folie in Umfangsrichtung (φ) definiert, und/oder mit Mitteln zum Einstellen des Volumenstroms verbunden und regelt diese Mittel derart', dass sich die Anzahl der Erhebungen pro Flächen- oder Längeneinheit einem Sollwert nähert.It is also advantageous to supply the measurement results to a control unit. This control unit is advantageously provided with means for adjusting the draw ratio R1 / R2, which is connected to the stretching of the film in the circumferential direction (φ) is defined, and / or with means for adjusting the volume flow and controls these means in such a ', the number of the bumps that per Area or length unit approaches a target value.
Die Mittel zum Einstellen des Volumenstromes als auch des Streckverhältnisses können verschiedene Komponenten umfassen. Zu solchen Komponenten zählen Heiz- oder Kühlaggregate, welche die der Kunststoffschmelze Temperatur und damit ihre Viskosität im Blaskopf beeinflussen, wie sie z. B. in der EP 0 425 797 A1 gezeigt sind. Es können auch Heiz- oder Kühlaggregate vorgesehen werden, die die Temperatur des Folienschlauches über Kühl- oder Heizmedien beeinflussen. Hierzu zählt Blasluft. Solche Kühlaggregate sind z. B. in der DE 42 07 439 A1 und der DE 42 36 443 A1 dargestellt. Eine Beeinflussung des Volumenstromes kann auch durch Mittel zur Änderung des Volumenstroms der Kühlmedien erreicht werden. Ein weiteres Mittel zum Einstellen des Volumenstroms können Mittel zum Einstellen der Breite des ringförmigen Spaltes sein. In den genannten Veröffentlichungen geht es vor allem um die abschnittsweise Beeinflussung des Viskosität der Kunststoffschmelze, da der Volumenstrom als auch das Streckverhältnis abschnittweise geregelt werden soll.The means for setting the volume flow and the stretching ratio can comprise different components. Such components include heating or cooling units, which influence the temperature of the plastic melt and thus its viscosity in the blow head, as they are e.g. B. are shown in EP 0 425 797 A1. Heating or cooling units can also be provided which influence the temperature of the film tube via cooling or heating media. This includes blowing air. Such cooling units are such. B. in DE 42 07 439 A1 and DE 42 36 443 A1. The volume flow can also be influenced by means of changing the volume flow of the cooling media. A further means for adjusting the volume flow can be means for adjusting the width of the annular gap. The publications mentioned are primarily concerned with influencing the viscosity of the plastic melt in sections, since the volume flow and the stretching ratio are to be regulated in sections.
Eine besonders bevorzugte Ausgestaltung der Erfindung umfasst weiterhin ein Mittel zum Messen der Dicke der extrudierten Blasfolie, wie sie in der DE 40 09 982 gezeigt sind. Ein solches Mittel zum Messen der Foliendicke kann einen kapazitiven Sensor oder einen optischen Sensor, der das reflektierte Licht oder das absorbierte Licht untersucht, umfassen. Dieser optische Sensor kann mit der Messvorrichtung identisch sein.A particularly preferred embodiment of the invention further comprises a means for measuring the thickness of the extruded blown film, as shown in DE 40 09 982. Such a means for measuring the film thickness can comprise a capacitive sensor or an optical sensor which examines the reflected light or the absorbed light. This optical sensor can be identical to the measuring device.
In einer besonders bevorzugten Ausführungsform der Erfindung werden die Messergebnisse der Dickenmessung der extrudierten Folie ebenfalls der Steuereinheit zugeführt. In dieser Steuereinheit sind die Sollwerte sowohl für die Dicke und/oder Dickentoleranz der Folie als auch die Sollwerte für die Anzahl der Erhebungen pro Flächen- oder Längeneinheit abgelegt. Aufgrund der Messwerte und der Sollwerte steuert die Steuereinheit die Mittel zum Einstellen des Volumenstroms derart, dass sich die Messgrößen der Foliendicke und der Teilchenanzahl pro Flächen- oder Längeneinheit den Sollwerten nähern.In a particularly preferred embodiment of the invention, the measurement results of the thickness measurement of the extruded film are also fed to the control unit. The setpoints for the thickness and / or thickness tolerance of the film and the setpoints for the number of surveys per unit area or length are stored in this control unit. On the basis of the measured values and the target values, the control unit controls the means for setting the volume flow in such a way that the measured variables of the film thickness and the number of particles per unit area or length approach the target values.
Vorteilhafterweise ist an der Steuereinheit eine Priorisierung vornehmbar, so dass die Steuereinheit die Einstellung der Messwerte einer der beiden Messgrößen gegenüber der Einstellung der anderen Messgröße bevorzugt.Prioritization can advantageously be carried out on the control unit, so that the control unit prefers the setting of the measured values of one of the two measured variables over the setting of the other measured variable.
Eine bevorzugte Ausgestaltung der Erfindung enthält Mittel zum Extrudieren von Teilchen an zumindest einer der beiden Flächen des Folienschlauches, wobei die aufzutragende Menge an Teilchen durch Steuersignale eingestellt werden kann.A preferred embodiment of the invention contains means for extruding particles on at least one of the two surfaces of the film tube, wherein the amount of particles to be applied can be adjusted by control signals.
Vorteilhafterweise sind die Mittel zum Extrudieren von Teilchen mit einer Steuereinheit verbunden. Diese Steuereinheit erhält die Messergebnisse von der Messvorrichtung und steuert die Mittel zum Extrudieren von Teilchen derartig, dass sich die Anzahl der Erhebungen pro Flächen- oder Längeneinheit einem Sollwert nähert.The means for extruding particles are advantageously connected to a control unit. This control unit receives the measurement results from the measuring device and controls the means for extruding particles in such a way that the number of surveys per unit area or length approaches a target value.
Vorteilhafterweise werden zur Erzeugung der Erhebungen Materiepartikel verwendet, die entweder Feststoffpartikel, Nanopartikel oder kleine Volumen einer Schmelze, welche nach dem Erkalten Erhebungen bilden, darstellen. Sowohl der Volumenstrom als auch das Streckverhältnis lassen sich abschnittweise mit den gleichen Vorrichtungsbestandteilen verändern. Verfügt eine Vorrichtung zur Herstellung von Blasfolienschläuchen über eine Mehrzahl unterschiedlicher dieser Vorrichtungsbestandteile, so können durch eine selektive und unterschiedliche Regelung sowohl die Dickensollwerte als auch die Anzahl der Erhebungen pro Flächen- oder Längeneinheit unabhängig voneinander optimiert werden. So kann die Streckung eines Umfangabschnittes durch das Einblasen von Heizluft geschehen, während eine Erhöhung des Volumenstromes durch die Verbreiterung des Austrittsspaltes für eine unabhängige Einstellung, insbesondere für die Beibehaltung, der Foliendicke sorgt.To generate the elevations, it is advantageous to use material particles which are either solid particles, nanoparticles or small volumes of a melt which form elevations after cooling. Both the volume flow and the stretch ratio can be changed in sections with the same device components. If a device for the production of blown film hoses has a plurality of different of these device components, then the thickness setpoints and the number of elevations per unit area or length can be optimized independently of one another by a selective and different control. A circumferential section can thus be stretched by blowing in heating air, while an increase in the volume flow by widening the outlet gap ensures an independent setting, in particular for maintaining the film thickness.
Ein bevorzugtes Verfahren zur Herstellung eines Blasfolienschlauches, der mit zumindest einer selbstreinigenden Oberfläche versehen ist, umfasst einen Verfahrensschritt, in dem zumindest Abschnitte zumindest einer der Umfangsflächen des Folienschlauches auf die Anzahl der Erhebungen pro Flächen- oder Längeneinheit untersucht werden.A preferred method for producing a blown film tube that is provided with at least one self-cleaning surface comprises a method step in which at least sections of at least one of the peripheral surfaces of the film tube are examined for the number of elevations per unit area or length.
Weitere Ausführungsbeispiele der Erfindung gehen aus der gegenständlichen Beschreibung und den Ansprüchen hervor. Die einzelnen Figuren zeigen:Further exemplary embodiments of the invention are evident from the description and the claims. The individual figures show:
Fig. 1 Vorrichtung zum Herstellen eines FolienschlauchesFig. 1 device for producing a film tube
Fig. 2 Ausschnitt aus einem Folienschlauch mit einer ungleichmäßigenFig. 2 section of a film tube with an uneven
Dichte von Erhebungen Fig. 3 Ausschnitt aus einem Folienschlauch mit einer gleichmäßigenDensity of elevations Fig. 3 Section of a film tube with a uniform
Dichte von ErhebungenDensity of surveys
Fig. 1 zeigt eine erfindungsgemäße Vorrichtung zur Herstellung von Folienschläuchen mit zumindest einer selbstreinigenden Oberfläche. Dem Folienblaskopf 2 wird über eine Förderschnecke 1 das zu extrudierende Material, das über einen Trichter eingefüllt wird, zugeführt. Die Förderschnecke 1 wird über einen Motor angetrieben. Das Material wird im Folienblaskopf 2 in nicht näher dargestellter Weise geschmolzen und in einen nicht dargestellten Ringspalt gepresst. Aus diesem Ringspalt wird der Folienschlauch 3 extrudiert. Dieser Folienschlauch weist auf zumindest einer Fläche Erhebungen 10 auf. Dabei weist der Folienschlauch 3 einen Radius Ri auf, der im wesentlichen identisch mit dem Radius des Ringspaltes ist. Die Extrusionsgeschwindigkeit ist mit Vi bezeichnet. Durch das nicht näher erläuterte Erzeugen eines Innendrucks wird die Blasfolie 3 im weiteren Verlauf auf einen Radius R aufgeweitet, wobei die gedachte Mittelachse 5 des Folienschlauchs 3 erhalten bleibt. Damit die den Innendruck sicher stellende Luft nicht entweichen kann, durchläuft der Folienschlauch 3 eine Abquetschvorrichtung 5, die aus zwei Abquetschwalzen besteht, zwischen welchen die Folie läuft. Von diesem Abquetschwalzenpaar ist nur die vordere Abquetschwalze 4 sichtbar. Die Umfangsgeschwindigkeit der Abquetschwalzen V2 kann jedoch anders gewählt sein als die Extrusionsgeschwindigkeit V,. Das hat zur Folge, dass der Folienschlauch gestreckt (bei V2 > Vi) wird. Unmittelbar vor dem Einlaufen des Folienschlauches 3 in die Abquetschvorrichtung 5 beträgt die Fördergeschwindigkeit des Folienschlauches ebenfalls V2. Hat nun der Blasfolienschlauch bereichsweise verschiedene Temperaturen, kann der Radius R2 in diesen Bereichen ebenfalls unterschiedlich sein, was Auswirkungen auf Anzahl der Erhebungen pro Flächen- oder Längeneinheit hat. Um jedoch eine gleichmäßige Anzahl an Erhebungen pro Flächen- oder Längeneinheit zu erhalten, wird diese Anzahl mit dem Messgerät 6 bestimmt. Das Messgerät 6 ist in einer nicht näher dargestellten Weise in einem Gestell gelagert, so dass eine Bewegung des Messgerätes um den Folienschlauch herum in Richtung des Doppelpfeiles A möglich ist. Die so erhaltenen Messergebnisse werden einer Auswert- und Regeleinheit 7 zugeführt. Die Auswert- und Regeleinheit vergleicht die Messergebnisse mit einem Sollwert und steuert das Heizelement 8 derart, dass sich über die Temperaturverteilung auf dem Umfang des Folienschlauches eine konstante Anzahl von Erhebungen pro Flächen- oder Längeneinheit ergibt. Derartige Heizelemente können über den gesamtem Folienblaskopf verteilt sein, jedoch ist exemplarisch nur das Heizelement 8 dargestellt. Auf gleiche Weise kann die Auswert- und Regeleinheit das Kühl- und Heizelement 9 steuern, um eine bereichsweise zu hohe Temperatur des Folienschlauches ausgleichen zu können. Eine Vielzahl von Kühl- und Heizelementen 9 können einen Kühl- und Heizring bilden, so dass alle Bereiche des Folienschlauches gekühlt und/oder geheizt werden können.1 shows a device according to the invention for producing film tubes with at least one self-cleaning surface. The film blow head 2 is fed via a screw conveyor 1, the material to be extruded, which is filled in via a funnel. The screw conveyor 1 is driven by a motor. The material is melted in the film die 2 in a manner not shown and pressed into an annular gap, not shown. The film tube 3 is extruded from this annular gap. This film tube has elevations 10 on at least one surface. The film tube 3 has a radius Ri, which is essentially identical to the radius of the annular gap. The extrusion speed is labeled Vi. By generating an internal pressure, which is not explained in any more detail, the blown film 3 is expanded to a radius R in the further course, the imaginary central axis 5 of the film tube 3 being retained. So that the air ensuring the internal pressure cannot escape, the film tube 3 passes through a squeezing device 5, which consists of two squeezing rollers, between which the film runs. Of this pair of squeeze rollers, only the front squeeze roller 4 is visible. The peripheral speed of the squeeze rollers V 2 can, however, be chosen differently than the extrusion speed V ,. As a result, the film tube is stretched (with V 2 > Vi). Immediately before the film tube 3 enters the squeezing device 5, the conveying speed of the film tube is also V 2 . If the blown film tube has different temperatures in some areas, the radius R 2 can also be different in these areas, which has an effect on the number of surveys per unit area or length. However, in order to obtain a uniform number of surveys per unit area or length, this number is determined with the measuring device 6. The measuring device 6 is mounted in a frame in a manner not shown, so that a movement of the measuring device around the film tube in the direction of the double arrow A is possible. The measurement results thus obtained are fed to an evaluation and control unit 7. The evaluation and control unit compares the measurement results with a target value and controls the heating element 8 in such a way that a constant number of surveys per unit area or length results from the temperature distribution on the circumference of the film tube. Such heating elements can be distributed over the entire film blowing head, but only the heating element 8 is shown as an example. In the same way, the evaluation and Control unit control the cooling and heating element 9 in order to be able to compensate for a regionally high temperature of the film tube. A large number of cooling and heating elements 9 can form a cooling and heating ring, so that all areas of the film tube can be cooled and / or heated.
Fig. 2 zeigt eine Projektion eines Ausschnitt 21 eines Folienschlauchs, dessen Breite sich aus dem Radius R und betrachteten Winkelbereich in Umfangsrichtung φ ergibt. Der Bereich A hat sich in Umfangsrichtung zuwenig gestreckt, während sich der Bereich in Umfangsrichtung φ zu viel gestreckt hat. Dieser Umstand kann mit einer zu niedrigen (Bereich A) und mit einer zu hohen Temperatur (Bereich B) der Kunststoffschmelze zu tun haben. Eine solche ungleiche Streckung über den Schlauchumfang kann jedoch auch aufgrund anderer Umstände eintreten. In jedem Fall ist die in Figur 2 gezeigte ungleichen Verteilung der Erhebungen 10 in dem Ausschnitt 21 unerwünscht. Aufgrund der geschilderten Probleme wird die Anzahl an Erhebungen 10 pro Längeneinheit insbesondere in Umfangsrichtung φ des Folienschlauches beobachtet. Fig. 3 zeigt eine Ausschnitt 24 aus einem Folienschlauch 3, welcher 24 ebenfalls die Breite R2φ hat. Der Abschnitt 24 weist gleichmäßige Abstände der Erhebungen 10 auf. Hierzu wurde die Anzahl der Erhebungen pro Flächenoder Längeneinheit gemessen und aufgrund eines Vergleiches dieses Messwertes mit dem Sollwert wurde die Temperatur des Folienschlauchabschnittes 22 so eingestellt, dass sich die dargestellte, nahezu gleichmäßige Verteilung der Erhebungen pro Flächen- oder Längeneinheit ergibt. FIG. 2 shows a projection of a section 21 of a film tube, the width of which results from the radius R and the angular range considered in the circumferential direction φ. The area A has stretched too little in the circumferential direction, while the area has stretched too much in the circumferential direction φ. This may be due to a too low (area A) and too high (area B) temperature of the plastic melt. Such uneven stretching over the circumference of the tube can also occur due to other circumstances. In any case, the uneven distribution of the elevations 10 in the cutout 21 shown in FIG. 2 is undesirable. Because of the problems described, the number of elevations 10 per unit length is observed in particular in the circumferential direction φ of the film tube. Fig. 3 shows a section 24 of a film tube 3, which 24 also has the width R 2 φ. The section 24 has uniform distances between the elevations 10. For this purpose, the number of surveys per unit area or length was measured, and on the basis of a comparison of this measured value with the target value, the temperature of the film tube section 22 was set such that the almost uniform distribution of the surveys per unit area or unit length is shown.

Claims

Patentansprüche claims
1. Vorrichtung zur Herstellung von Blasfolienschläuchen (3), welche mit zumindest einer selbstreinigenden Oberfläche ausgestattet sind, welche folgende Merkmale umfasst:1. Device for producing blown film tubes (3), which are equipped with at least one self-cleaning surface, which comprises the following features:
- einen Extruder (1 ), welcher Kunstoffschmelze bereitstellt,- an extruder (1) which provides plastic melt,
- einen Blaskopf (2), welcher über einen ringförmigen Austrittsspalt verfügt,a blow head (2) which has an annular outlet gap,
- eine Abquetschvorrichtung (4) gekennzeichnet durch eine Messvorrichtung, welche zumindest Abschnitte (22,23) zumindest einer der Umfangflächen (21 ) des Folienschlauchs (3) auf die Anzahl der Erhebungen (10) pro Flächen- oder Längeneinheit untersucht.- A squeezing device (4) characterized by a measuring device which examines at least sections (22, 23) of at least one of the peripheral surfaces (21) of the film tube (3) for the number of elevations (10) per unit area or length.
2. Vorrichtung nach Anspruch 2 dadurch gekennzeichnet, dass die Messvorrichtung (6)2. Device according to claim 2, characterized in that the measuring device (6)
- eine CCD-Kamera ist,- is a CCD camera,
- eine Vorrichtung ist, welche über eine Strahlungsquelle - für elektromagnetische Strahlung wie Licht oder Partikelstrahlung- is a device which has a radiation source - for electromagnetic radiation such as light or particle radiation
' wie Betastrahlung - verfügt, die die Strahlung auf die Folie (3) emittiert und dass zumindest ein Sensor vorgesehen ist, der die reflektierte Strahlung und/oder die Strahlung, die die Folie (3) durchdringt, auf zumindest eine physikalische Eigenschaft - wie Intensität oder Beugung - untersucht.'Like beta radiation - which emits the radiation onto the film (3) emitted and that at least one sensor is provided which examines the reflected radiation and / or the radiation which penetrates the film (3) for at least one physical property - such as intensity or diffraction.
3. Vorrichtung nach einem der vorstehenden Ansprüche dadurch gekennzeichnet, dass die Messergebnisse einer Steuereinheit (7) zugeführt werden, welche mit Mitteln (8,9) zur Einstellung des Streckverhältnisses (R1/R2) in Umfangsabschnitten (21 , 24) des Folienschlauchs (3) verbunden ist und diese Mittel (8,9) ansteuert, so dass dich die Anzahl der Erhebungen (10) pro Flächen- oder Längeneinheit einem Sollwert nähert.3. Device according to one of the preceding claims, characterized in that the measurement results are fed to a control unit (7) which is provided with means (8, 9) for setting the stretching ratio (R1 / R2) in circumferential sections (21, 24) of the film tube (3 ) is connected and this means (8,9) controls, so that the number of surveys (10) per unit area or length approaches a target value.
4. Vorrichtung nach Anspruch 3 dadurch gekennzeichnet, dass die Mittel (8,9) zur Einstellung des Streckverhältnisses (R1/R2) eine oder mehrere der folgenden Komponenten umfassen:4. The device according to claim 3, characterized in that the means (8,9) for setting the stretching ratio (R1 / R2) comprise one or more of the following components:
Heiz oder Kühlaggregate (8), welche die Temperatur der Kunststoffschmelze im Blaskopf in Abschnitten der Umfangsfläche des Ringspaltes beeinflussen,Heating or cooling units (8) which influence the temperature of the plastic melt in the blow head in sections of the peripheral surface of the annular gap,
- Heiz oder Kühlaggregate (9), welche die Temperatur des Folienschlauchs (3) über Kühl- oder Heizmedien - wie Blasluft - in Abschnitten des Umfangs des Folienschlauches (21 ,24) beeinflussen,- Heating or cooling units (9) which influence the temperature of the film tube (3) via cooling or heating media - such as blown air - in sections of the circumference of the film tube (21, 24),
- Mittel zur Änderung des Volumenstroms der Kühlmedien, welche Abschnitte (21 ,24) des Umfangs des Folienschlauchs bestreichen,Means for changing the volume flow of the cooling media which cover sections (21, 24) of the circumference of the film tube,
- Mittel zur Einstellung der Breite des ringförmigen Spalts in Abschnitten des Umfanges des Spaltes.- Means for adjusting the width of the annular gap in sections of the circumference of the gap.
5. Vorrichtung nach einem der vorstehenden Ansprüche gekennzeichnet durch ein Mittel zum Messen der Dicke der extrudierten Folie (3).5. Device according to one of the preceding claims characterized by means for measuring the thickness of the extruded film (3).
6. Vorrichtung nach Anspruch 6 dadurch gekennzeichnet, dass die Mittel zum Messen der Dicke der extrudierten Folie (3) aus zumindest eine der folgenden Elemente umfassen:6. The device according to claim 6, characterized in that the means for measuring the thickness of the extruded film (3) comprise at least one of the following elements:
- einen kapazitiven Sensor- a capacitive sensor
- einen optischen Sensor, welcher das reflektierte oder absorbierte Licht untersucht und welcher mit der Messvorrichtung identisch sein kann.an optical sensor which examines the reflected or absorbed light and which can be identical to the measuring device.
7. Vorrichtung nach Anspruch 5 oder 6 dadurch gekennzeichnet dass dass die Messergebnisse der Mittel zum Messen der Dicke der extrudierten Folie (3) der Steuereinheit (7) zugeführt werden, und dass in der Steuereinheit (7) Sollwerte sowohl für die Dicke und/oder Dickentoleranzen der Folie (3) als auch für die Teilchenanzahl pro Flächen- oder Längeneinheit abgelegt sind, und dass die Steuereinheit (7) die Mittel (8,9) zur Einstellung des Volumenstroms der Kunststoffschmelze ansteuert, so dass sich die Messgrößen Foliendicke und Teilchenanzahl pro Flächen- oder Längeneinheit den Sollwerten nähern.7. The device according to claim 5 or 6, characterized in that the measurement results of the means for measuring the thickness of the extruded film (3) of the control unit (7) are supplied, and that in the control unit (7) setpoints for both the thickness and / or Thickness tolerances of the film (3) as well as for the number of particles per unit area or length are stored, and that the control unit (7) controls the means (8,9) for adjusting the volume flow of the plastic melt, so that the measured variables film thickness and number of particles per Area or length unit approach the target values.
8. Vorrichtung nach Anspruch 7 dadurch gekennzeichnet dass an der Steuereinheit (7) eine Priorisierung vornehmbar ist, welche dazu führt, dass die Steuereinheit (7) die Einstellung der Sollwerte einer der beiden Messgrößen gegenüber der Einstellung der anderen Messgröße priorisiert.8. The device according to claim 7, characterized in that a prioritization can be carried out on the control unit (7), which leads to the control unit (7) prioritizing the setting of the setpoints of one of the two measured variables over the setting of the other measured variable.
9. Vorrichtung nach einem der vorstehenden Ansprüche dadurch gekennzeichnet dass9. Device according to one of the preceding claims characterized in that
Mittel zum Extrudieren von Teilchen (10) an zumindest einer der beiden Flächen des Folienschlauchs (3) vorgesehen sind, wobei die Auftragsmenge der Teilchen (10) durch Steuersignale eingestellt werden kann.Means for extruding particles (10) are provided on at least one of the two surfaces of the film tube (3), the application quantity of the particles (10) being adjustable by control signals.
10. Vorrichtung nach Anspruch 9 dadurch gekennzeichnet dass die Mittel zum Extrudieren von Materiepartikeln (10) mit einer10. The device according to claim 9, characterized in that the means for extruding material particles (10) with a
Steuereinheit (7) verbunden sind, welcher (7) die Messergebnisse der Messvorrichtung (6) zugeführt werden, und dass die Steuereinheit (7) die Mittel zum Extrudieren vonControl unit (7) are connected, to which (7) the measurement results of the measuring device (6) are fed, and that the control unit (7) has the means for extruding
Teilchen (10) ansteuert, so dass sich die Anzahl der Erhebungen (10) pro Flächen- oderParticles (10) controls, so that the number of surveys (10) per area or
Längeneinheit einem Sollwert nähert.Length unit approaches a setpoint.
11. Vorrichtung nach Anspruch 10 dadurch gekennzeichnet, dass sich die Materiepartikel (10) auf zumindest eine der folgenden weisen charakterisierbar sind:11. The device according to claim 10, characterized in that the matter particles (10) can be characterized in at least one of the following ways:
- Feststoffpartikel- solid particles
- kleine Volumen einer Schmelze, welche nach ihrem Erkalten Erhebungen (10) bildet,small volumes of a melt which forms elevations (10) after it has cooled,
- Nanopartikel.- nanoparticles.
12. Vorrichtung nach einem der vorstehenden Ansprüche dadurch gekennzeichnet, dass die Messergebnisse einer Steuereinheit (7) zugeführt werden, welche mit verschiedenen Mitteln (8,9) zur Einstellung des Volumenstroms der Kunststoffschmelze und des Streckverhältnisses (R1/R2) verbunden ist und diese Mittel (8,9) so ansteuert, dass sich sowohl die Anzahl der Erhebungen (10) pro Flächen- oder Längeneinheit als auch die Foliendicke einem Sollwert nähert.12. Device according to one of the preceding claims, characterized in that the measurement results are fed to a control unit (7) which is connected to various means (8, 9) for setting the volume flow of the plastic melt and the stretching ratio (R1 / R2) and these means (8,9) so that both the number of surveys (10) per Area or length unit as well as the film thickness approaches a target value.
13. Vorrichtung nach Anspruch 12 dadurch gekennzeichnet, dass die Mittel (8,9) zur Einstellung des Streckverhältnisses (R1/R2) eine oder mehrere der folgenden Komponenten umfassen:13. The apparatus according to claim 12, characterized in that the means (8,9) for setting the stretching ratio (R1 / R2) comprise one or more of the following components:
- Heiz oder Kühlaggregate (8), welche die Temperatur der Kunststoffschmelze im Blaskopf in Abschnitten der Umfangsfläche des Ringspaltes beeinflussen,Heating or cooling units (8) which influence the temperature of the plastic melt in the blow head in sections of the circumferential surface of the annular gap,
- Heiz oder Kühlaggregate (9), welche die Temperatur des Folienschlauchs (3) über Kühl- oder Heizmedien - wie Blasluft - in Abschnitten des Umfangs des Folienschlauches (21 ,24) beeinflussen,- Heating or cooling units (9) which influence the temperature of the film tube (3) via cooling or heating media - such as blown air - in sections of the circumference of the film tube (21, 24),
- Mittel zur Änderung des Volumenstroms der Kühlmedien, welche Abschnitte (21 ,24) des Umfangs des Folienschlauchs bestreichen,Means for changing the volume flow of the cooling media which cover sections (21, 24) of the circumference of the film tube,
- Mittel zur Einstellung der Breite des ringförmigen Spalts in Abschnitten des Umfanges des Spaltes.- Means for adjusting the width of the annular gap in sections of the circumference of the gap.
14. Verfahren zur Herstellung selbstreinigender Blasfolie mit einer Vorrichtung nach einem der vorstehenden Ansprüche 14. A method for producing self-cleaning blown film with a device according to any one of the preceding claims
EP03794915A 2002-09-10 2003-08-21 Device for the production of self-cleaning films according to the blow-molding method Withdrawn EP1539458A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10242175A DE10242175B4 (en) 2002-09-10 2002-09-10 Apparatus and process for the production of self-cleaning foils by blow molding
DE1242175 2002-09-10
PCT/EP2003/009284 WO2004024420A1 (en) 2002-09-10 2003-08-21 Device for the production of self-cleaning films according to the blow-molding method

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EP1539458A1 true EP1539458A1 (en) 2005-06-15

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EP03794915A Withdrawn EP1539458A1 (en) 2002-09-10 2003-08-21 Device for the production of self-cleaning films according to the blow-molding method

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EP (1) EP1539458A1 (en)
AU (1) AU2003251714A1 (en)
DE (1) DE10242175B4 (en)
WO (1) WO2004024420A1 (en)

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EP1681531B1 (en) * 2005-01-13 2008-04-23 Plast-Control GmbH Device and method for the capacitive measurement of materials
DE102005051675B3 (en) 2005-10-28 2007-04-19 Windmöller & Hölscher Kg Film thickness sensor with porous fan
WO2020190366A1 (en) * 2019-03-15 2020-09-24 Dow Global Technologies Llc Film thickness gauge by near-infrared hyperspectral imaging
CN112848195B (en) * 2021-01-07 2023-06-30 石家庄新能力橡塑制品有限公司 XPE master production device with online thickness measurement function and working method thereof

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JPS6478815A (en) * 1987-09-21 1989-03-24 Toshiba Machine Co Ltd Profile control of plastic sheet with intermittent pattern
JPH0698671B2 (en) * 1989-03-30 1994-12-07 トミー機械工業株式会社 Film thickness control device for melt extrusion film forming
DE3936239A1 (en) * 1989-10-31 1991-05-02 Windmoeller & Hoelscher RING NOZZLE FOR EXTRESS PRESSES, PREFERABLY FILM BLOW HEAD
US5178806A (en) * 1990-01-10 1993-01-12 Reifenhauser Gmbh & Co. Maschinenfabrik Process for producing a plastic foil of thermoplastic material
DE4009982C2 (en) * 1990-03-28 2000-11-02 Windmoeller & Hoelscher Method for measuring the thickness of warm extruded foils made of thermoplastic
DE4207439B4 (en) * 1991-12-12 2004-05-06 Windmöller & Hölscher Kg Foil blowing head for the production of tubular foils from thermoplastic
DE4236443B4 (en) * 1992-10-28 2005-02-24 Windmöller & Hölscher Kg Method for controlling the temperature of a film blowing head for the production of plastic tubular films
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DK0772514T3 (en) * 1994-07-29 1999-08-23 Wilhelm Barthlott Self-cleaning surfaces of articles and method of making them
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See references of WO2004024420A1 *

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DE10242175B4 (en) 2005-01-05
WO2004024420A1 (en) 2004-03-25
AU2003251714A1 (en) 2004-04-30
DE10242175A1 (en) 2004-03-18

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