EP1982140A1 - Procede pour mesurer l'epaisseur de feuilles multicouches - Google Patents

Procede pour mesurer l'epaisseur de feuilles multicouches

Info

Publication number
EP1982140A1
EP1982140A1 EP06806158A EP06806158A EP1982140A1 EP 1982140 A1 EP1982140 A1 EP 1982140A1 EP 06806158 A EP06806158 A EP 06806158A EP 06806158 A EP06806158 A EP 06806158A EP 1982140 A1 EP1982140 A1 EP 1982140A1
Authority
EP
European Patent Office
Prior art keywords
thickness
film
sensor
sensors
layers
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Withdrawn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
EP06806158A
Other languages
German (de)
English (en)
Inventor
Albert Keller
Markus Hänggli
Philipp Weber
Peter Stuker
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.)
HCH Kuendig and Cie AG
Original Assignee
HCH Kuendig and Cie AG
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
Priority claimed from EP05405613A external-priority patent/EP1780498A1/fr
Application filed by HCH Kuendig and Cie AG filed Critical HCH Kuendig and Cie AG
Priority to EP06806158A priority Critical patent/EP1982140A1/fr
Publication of EP1982140A1 publication Critical patent/EP1982140A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
    • G01B7/087—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means for measuring of objects while moving
    • 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
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/147—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle
    • B29C48/1472—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle at the die nozzle exit 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
    • B29C48/92—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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/086—EVOH, i.e. ethylene vinyl alcohol copolymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material

Definitions

  • the invention relates to a method for determining the thickness of multilayer films according to the preamble of independent claim 1.
  • Multilayer films of plastics are constructed from a plurality of layers of different materials. Commonly used thermoplastics are polyethylene (PE), polypropylene (PP), polyamide (PA), ethylene-vinyl alcohol copolymers (EVOH), and others.
  • the multilayer films are produced from the different thermoplastics with coextrusion or multilayer extrusion.
  • Known such extrusion processes are blown extrusion and flat extrusion.
  • Blasextrusion be produced so-called blown films.
  • the melt is extruded from a ring die in blown extrusion and formed into a tube.
  • the hose is blown air to expand this.
  • the tube is then laid flat, in many cases cut into two or more sheets and wound up.
  • flat film extrusion the melt is extruded from a slot die.
  • thermoplastics with different properties are simultaneously extruded through multiple nozzles and combined to form the multilayer film.
  • adhesion promoters HV
  • the adhesion promoters have to improve the bond between layers of the multilayer film.
  • Multilayer films are used for the packaging of foods in large quantities. This is called barrier plastics. These multilayer films have layers, e.g. are poorly permeable to oxygen, moisture or other substances, which leads to better shelf life of the food. For food packaging, multi-layer films are also used as shrink films, cooking bags, germ-free packaging for dairy products, and the like. Typical barrier films have e.g. a construction
  • thickness on the whole size should be as uniform as possible.
  • a uniform thickness is, among other things, necessary to be in the other
  • Processing of the film e.g. to allow a uniform printing.
  • Processing of the film e.g. to allow a uniform printing.
  • the thickness profile of the film must be measured.
  • Capacitive sensors which by the dielectric constant and / or the
  • Damping factor of the film can be influenced.
  • Capacitive sensors can measure reflectively or transmissively.
  • Multi-layer film is not just about ensuring that the entire thickness of a film over the entire film is as equal as possible. It is also necessary that the individual layers are as constant as possible thick.
  • the measuring signals of capacitive sensors are dependent on the dielectric constant of the material to be measured.
  • the measurement signals from capacitive sensors operating according to the reflection principle are practically directly proportional to the thickness of a film and to the dielectric constant of the material of the film.
  • the dielectric constants of certain materials are temperature dependent.
  • Sensors operating capacitively according to the reflection principle are used e.g. used with advantage for measuring the film thickness at the film bubble of blown film extrusion lines.
  • a sensor In order to record the thickness profile of a film bubble online, a sensor is guided around the film bubble on an annular construction. One cycle typically takes 1-2 minutes. The sensor is pressed against the foil bubble with even pressure. This allows a very good and accurate online detection of the thickness profile of e.g. PE films.
  • the measurement of thickness and of thickness profiles can be faulty. Since the sensor can not recognize that, for example, at the same time the thickness of the entire film and also the thickness of one or more of the layers of the multilayer film simultaneously change so that the error, which is due to the thickness of the film and the measurement error caused by the Thickness of a layer of the multilayer film is due to partially or completely compensate each other.
  • the capacitive sensor detects no or a wrong, too much or too little change in the thickness.
  • US 202/0057096 makes use of the fact that the dielectric constant of the barrier materials PA and EVOH is strongly temperature-dependent. In addition to a first capacitive measurement at high temperature, a second capacitive measurement at much lower temperature is used to measure the thickness of two different material layers. However, this lower temperature is generally only reached after flattening, but certainly several meters after the first measuring point. This makes it difficult or impossible to measure the exact same film locations and the measurement results are greatly distorted by the thickness variations in the direction of production of the film.
  • the object of the invention is to provide a method which makes it possible to obtain profiles of the thickness of individual layers of multilayer films, or profiles of the thickness of groups of layers of multilayer films, such as e.g. of all barrier layers together as accurately as possible.
  • the method has the features of the characterizing part of independent claim 1.
  • the dependent claims relate to advantageous embodiments of the invention.
  • the determination of the thickness and of the thickness profiles of multilayer films according to the new method utilizes, for example, the different sensitivity for the dielectric constant of capacitive reflective and, for example, of sensors based on ionizing radiation.
  • the measured values of capacitive thickness sensors which work according to the reflection principle are Product of the thickness of the film and the relative dielectric constant ⁇ r .
  • the measured values of thickness sensors, which measure for example on the basis of ionizing radiation, are practically only dependent on the thickness and the specific weight of the material.
  • the measured values of sensors operating with an optical interference method are just as dependent on the dielectric constant.
  • Sensors that work with ionizing reflection or with an optical interference method can be arranged in the direction of the film directly in front of, behind or next to the sensor, which operates capacitive reflective.
  • both sensors measure the exact same line on the film as precisely as possible so that variations in the thickness in the direction of production are simultaneously included in the measurement for both sensors. If both sensors are arranged one above the other or next to each other at a specific distance, they measure on two parallel spiral paths on the foil. The horizontal distance of these spiral tracks should be at least by a factor of 2 smaller than the corresponding distance of the control elements in the blow head. With sensors arranged one above the other, the spacing of these spiral tracks becomes small when the take-off speed is high, but it increases proportionally with the vertical distance between the two systems and greater reversing speed of the measuring device. The above condition is achieved for typical applications when the vertical distance of the two sensors is less than about 0.5 m. If the sensors are arranged next to each other, appropriate conditions apply.
  • the sensors which are mounted one above the other, can be displaced laterally just as much as is necessary to compensate for the offset caused by the combination of
  • Discharge speed and rotation speed to compensate.
  • the rotational speed of the take-off speed could be adjusted.
  • Dielectric properties of plastics such as thermoplastics used for multilayer film are e.g. in book "The plastics and their properties", Hans Domininghaus, Springer, 1998 to find.
  • the dielectric constants ⁇ and the dielectric loss factor tan ⁇ for plastics used for multilayer films are plotted as a function of the temperature. It can thus be seen that in many cases it contributes to further increasing the measuring accuracy of the sensors, even if the temperature of the film is measured and included in the determination of the correction values and values of the thickness. Since the dielectric constants are much greater at higher temperatures for the frequently used barrier layer materials PA and EVOH, it is also advantageous to carry out the method according to the invention at a measuring point at which the film is still very hot.
  • FIG. 1 shows the schematic diagram of a multilayer film blown extrusion line to which the thickness is measured and monitored by the method of the present invention.
  • the production of foils takes place in the blown film extrusion line 1 as follows: From the extruder with a multi-ring die (not shown), the exiting melt of the various thermoplastics is formed into a tube. This film tube is withdrawn at a rate that is greater than the exit velocity of the melt. By a connection for compressed air in the blowing head 11 with the mold 12, the hose is inflated to the film bubble 13. At the end of the flattening 14, the film bubble with two Squeezing rollers 14 'squeezed. The flattened film tube 13 'is then passed to the winding device (not shown) (arrow) and wound into a roll.
  • the thickness of the film is applied to the film bladder 13 with a first, e.g. Capacitive sensor 17, measured, which operates on the reflection principle.
  • a second sensor e.g. a sensor with ionizing radiation 16, measures as far as possible at the same point or on the same line in the production direction. Both sensors run together on a web 17 'reversing around the film bubble 13 around and back. The sensors can also run continuously around the film bubble 13. The reversing process or the circulation time takes about half to several minutes.
  • the film tube is guided over the turning bars 15 to the fixed roller 15' and from there to a winder (not shown).
  • the measured values of the two sensors 16 and 17 are fed to the computer.
  • the computer 18 determines the profiles of the total thickness and the thickness of individual layers according to the equations in Tables 2 and 3.
  • the values determined for the thickness of the individual layers or groups of layers and the total thickness can be, for example graphically and / or numerically.
  • the assumption made by the new method is that the multilayer film consists of two types of thermoplastics.
  • the base material which is usually a polyethylene (PE) and barrier material such as polyamide (PA) or ethylene vinyl alcohol (EVOH), which have a much higher dielectric constant ⁇ r from 4 to 15.
  • PA polyamide
  • EVOH ethylene vinyl alcohol
  • the profile of the total thickness and / or the thickness of sub-layers calculated by the computer 18 are fed to the console 19 with which the system 1, i. We controlled and regulated the extrusion process and where the data could also be displayed on a screen. Finally, provision can also be made for the console 19 to regulate and control the thickness of individual layers and the entire multilayer film on the basis of the thickness values determined by the method in the computer 18, as previously explained.
  • the invention relates to the measurement and regulation of the thickness of the entire multilayer film but also to the measurement of the thickness of layers of different materials, usually thermoplastics.
  • the sensor 17, which measures capacitive reflective, is calibrated to the mean value of the total thickness at PE.
  • the sensor 16 which measures, for example, on the basis of ionizing radiation, is calibrated to the mean value of the total thickness of the multilayer film.
  • the total thickness of the multilayer film can be calculated correctly, although the measurements of each sensor alone have a measurement error which depends on the thickness of the PA layer in relation to the total thickness of the films.
  • the calculated K also contains a KalibrierWaranteil.
  • the calculated proportions of PE and PA are then not accurate. However, it can be shown that, for example, with 5% calibration error of the sensor 17, the resulting profile error for the PA profile at 30% PA content is less than 0.5%.
  • the thickness of the multilayer film 13 is measured with a first sensor 17 and a second sensor 16 and possibly further sensors.
  • the first sensor 17 and the one or more further sensors 16 generate different measured values for layers of the same thickness made from the same material of the multilayer film 13.
  • the measurement signals of the sensors 16, 17 are fed to a computer 18, which determines the total thickness of the multilayer film 13 and / or the thickness of individual layers of the multilayer film 13 from the different measured values of the first sensor 17 and of the further sensor or sensors 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un procédé pour déterminer l'épaisseur de feuilles multicouches (13) comprenant des couches constituées de différents matériaux non conducteurs, procédé selon lequel l'épaisseur de la feuille multicouche (13) est mesurée au moyen d'un premier capteur (17), et d'un deuxième capteur (16), et éventuellement à l'aide de capteurs supplémentaires, l'ensemble des capteurs effectuant une mesure si possible au même endroit et dans les mêmes conditions. Le premier capteur (17) et le deuxième capteur (16) ou les autres capteurs génèrent différentes valeurs de mesure pour des couches de différente épaisseur de la feuille multicouche (13) qui sont constituées du même matériau. Les signaux de mesure des capteurs (16, 17) sont entrés dans un ordinateur (18) qui détermine l'épaisseur total de la feuille multicouche (13) et/ou l'épaisseur des couches individuelles de la feuille multicouche (13), à partir des différentes valeurs de mesure fournies par le premier capteur (17) et le deuxième capteur (16) ou les autres capteurs.
EP06806158A 2005-10-28 2006-10-02 Procede pour mesurer l'epaisseur de feuilles multicouches Withdrawn EP1982140A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06806158A EP1982140A1 (fr) 2005-10-28 2006-10-02 Procede pour mesurer l'epaisseur de feuilles multicouches

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP05405613A EP1780498A1 (fr) 2005-10-28 2005-10-28 Procédé pour mesurer l'épaisseur de feuilles multicouches
EP05405697A EP1780499A1 (fr) 2005-10-28 2005-12-14 Procédé destiné à la mesure de l épaisseur de feuilles à plusieurs couches
EP06806158A EP1982140A1 (fr) 2005-10-28 2006-10-02 Procede pour mesurer l'epaisseur de feuilles multicouches
PCT/EP2006/009786 WO2007048499A1 (fr) 2005-10-28 2006-10-02 Procede pour mesurer l'epaisseur de feuilles multicouches

Publications (1)

Publication Number Publication Date
EP1982140A1 true EP1982140A1 (fr) 2008-10-22

Family

ID=37708355

Family Applications (2)

Application Number Title Priority Date Filing Date
EP05405697A Withdrawn EP1780499A1 (fr) 2005-10-28 2005-12-14 Procédé destiné à la mesure de l épaisseur de feuilles à plusieurs couches
EP06806158A Withdrawn EP1982140A1 (fr) 2005-10-28 2006-10-02 Procede pour mesurer l'epaisseur de feuilles multicouches

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP05405697A Withdrawn EP1780499A1 (fr) 2005-10-28 2005-12-14 Procédé destiné à la mesure de l épaisseur de feuilles à plusieurs couches

Country Status (3)

Country Link
US (1) US20100141274A1 (fr)
EP (2) EP1780499A1 (fr)
WO (1) WO2007048499A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1780500A1 (fr) * 2005-10-28 2007-05-02 Hch. Kündig & Cie. AG Procédé destiné à la mesure de l'épaisseur de feuilles à plusieurs couches
US8222908B2 (en) * 2010-02-16 2012-07-17 Stratasys, Inc. Capacitive detector for use in extrusion-based digital manufacturing systems
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