EP4436765A1 - Procédé pour surveiller un extrudat de soufflage de gaine et installation de soufflage de gaine - Google Patents

Procédé pour surveiller un extrudat de soufflage de gaine et installation de soufflage de gaine

Info

Publication number
EP4436765A1
EP4436765A1 EP22821914.3A EP22821914A EP4436765A1 EP 4436765 A1 EP4436765 A1 EP 4436765A1 EP 22821914 A EP22821914 A EP 22821914A EP 4436765 A1 EP4436765 A1 EP 4436765A1
Authority
EP
European Patent Office
Prior art keywords
locations
film
deviations
film bubble
blown film
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.)
Pending
Application number
EP22821914.3A
Other languages
German (de)
English (en)
Inventor
Ingo HEHMANN
Marco VENTKER-STEGEMANN
Michel BEMBENEK
Sebastian GLOSE
Markus Bussmann
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
Priority to EP25218093.0A priority Critical patent/EP4699779A2/fr
Publication of EP4436765A1 publication Critical patent/EP4436765A1/fr
Pending 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
    • B29C48/92—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
    • 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
    • B29C48/03—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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92057—Frequency
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92295—Errors or malfunctioning, e.g. for quality control
    • 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
    • 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

Definitions

  • the invention relates to a monitoring method according to claim 1 and a blown film system according to claim 8.
  • one or more plastic melts are produced from plastic granules in one or more extruders.
  • the melt or melts are distributed in a ring and guided out of the blow head through an outlet nozzle in the outlet area.
  • the film bubble created in this way is drawn off via a take-off, which comprises a pair of rollers with at least one driven roller. Downstream of the outlet nozzle, but before the take-off, the blown film is generally cooled on the inside and/or outside by means of cooling devices, so that the melt solidifies.
  • the film bubble is stretched in the transport direction and/or in the radial direction by the withdrawal and/or by an overpressure prevailing within the film bubble.
  • the film bubble After a certain transport distance, the film bubble has solidified to such an extent that it can no longer be significantly deformed. This transition is called the frost zone, the area between the outlet area and the frost zone is often referred to as the tube formation zone.
  • the take-off Before the film bubble passes the take-off, it is guided through a calibration device, which is preferably located downstream of the frost zone.
  • a flattening device can also be located between the calibration device and take-off, which gently converts the film bubble into a double flat web over a longer transport path.
  • the way in which the film bubble is influenced between the outlet nozzle and the calibration device plays a decisive role in the quality and properties of the film that is later produced from the film bubble.
  • the film bubble can be influenced intentionally, but also unintentionally. A disadvantageous influence on the film bubble is to be avoided. It is therefore desirable to characterize the film bubble between the exit area and the calibration device. In this way, a remedy can be created in the event of a disadvantageous influence.
  • the task is therefore to propose a method and a device for improved characterization of the film bubble.
  • the invention relates to a method for monitoring a film bubble in an exit area after exiting an exit nozzle and before leaving a calibration device of a blown film device. According to the invention, the following steps are carried out:
  • the detection is carried out by at least one detector with which the electromagnetic radiation emitted by the blown film can be detected or is detected.
  • the intensity is measured in particular within a defined wavelength range (the so-called measurement window), for which the at least one detector is preferably optimized.
  • the electromagnetic radiation can be in the so-called infrared range, where the wavelength is between 780 nm and 1 mm, but also in the range that is visible to humans (wave length between 380 nm and 780 nm) or in the high-energy range (UV radiation, wavelength below 380 nm). ).
  • the infrared radiation is generally radiation that occurs in the blown film itself and can be traced back to thermal radiation.
  • the visible and high-energy radiation is usually generated in a light source provided for this purpose, which is reflected or transmitted by the film bubble.
  • Various properties of the film bubble can be examined with the aid of radiation of different wavelengths.
  • Visible radiation can be used, for example, to make defects in the film bubble visible, such as stripes, specks, holes or a melt or film tear.
  • the radiation in the infrared range originates at least in part from the heat radiation from the film bubble. The intensity of this radiation in the measurement window is therefore a measure of the temperature of the film bubble.
  • the core idea of the invention is to use at least one detector to record or measure the electromagnetic radiation that emanates from different locations, in particular from locations on the outer surface, of the film bubble, be it through intrinsic radiation, reflection and/or transmission. This makes it possible to characterize the film bubble at two different locations with regard to certain properties, in particular the temperature. In particular, it is further provided that the measurement described above is repeated at different, consecutive points in time. Overall, it is thus possible not only to carry out a characterization of the film bubble at different locations, but also to track the development of the measured values over time, i.e. the measured intensity. In the case of the chronologically subsequent measurements, these are preferably carried out at the same locations or at almost the same locations as previous measurements.
  • the film bubble For a further characterization of the film bubble, it is provided according to the invention to determine a time course from the locations of the same intensity. Accordingly, the locations of the same intensities can be tracked over time.
  • the described detection and evaluation of the radiation with specific intensities, which emanates from different locations can result in a better characterization of the film bubble at different points in time. It is not just a question of location or time dependency, but both.
  • conclusions can be drawn about the relative temperature or the absolute temperature of the film bubble using the detected radiation, conclusions can be drawn about different conditions that act on the temperature. This makes it possible to output information, for example a warning, and/or to take suitable countermeasures, for example in the form of an adjustment of machine parameters.
  • the method according to the invention makes it possible to recognize the outer shape, ie a two-dimensional contour of the film bubble.
  • the measured intensity of a given wavelength changes to essentially zero (ignoring background radiation and other extraneous influences), so these edges can be reliably determined.
  • the determination of edges of the film bubble makes it possible to use the time course of these edges for further characterization of the film bubble. If the locations, i.e. the positions of the edges, change over time, this can indicate that the film bubble is not being produced stably.
  • the so-called bubble pumping is also one of these effects.
  • the edges of the film bubble By determining the edges of the film bubble, the development of fluttering or bubble pumping over time can be observed. In particular, fluttering in the exit area is decisive for the stability of the film bubble. If the deflections of the edges generally and/or specifically in the exit area exceed a predetermined value, process and/or machine parameters in particular are adjusted in order to minimize the deflection.
  • the film bubble can also be divided into height zones by the control and regulation device, in which the fluttering is observed separately in each case, with a separate deviation value, from which the parameters are adjusted, being specifiable for each zone.
  • a warning signal is issued to the machine operator.
  • the measurement of the locations with the same intensity is related to the transport direction and/or the geometric symmetry of the film bubble.
  • a comparison can be made with the geometric symmetry of the film bubble, which results from the edges of the film bubble. Deviations in the axes of symmetry or planes of symmetry indicate in particular an uneven cooling behavior of the film bubble, so that further measures can be taken. For example, it is conceivable to issue a warning signal to the operator.
  • the locations of the turning points of the edges or the angles of the turning points relative to the nominal or desired axis of symmetry can be used (which is usually given by the arrangement of the center of the outlet nozzle and the axis of symmetry of the calibration device) are compared.
  • a mean value line to be formed for the locations of the same wavelength for a specific point in time.
  • the proviso that this mean line is perpendicular to the transport direction of the film bubble is taken into account in particular.
  • Such a mean value line can then also be referred to as a contour line.
  • the evaluation can be used to set up a control loop in which the film bubble can be tempered differently over its circumference in order to keep the deviations below a deviation limit value.
  • At least one of the following elements and/or its settings of a blown film line can be influenced in order to influence the temperature behavior of the film bubble: external air application device, internal air application device, height of the storey cooling in
  • a dynamic deviation is a deviation with changes over time, whereas stationary ones Deviations are those that experience little or no change over time.
  • Dynamic deviations can be caused, for example, by moving disturbance variables, for example by a walking person who is detected by the detector.
  • a stationary deviation can be caused, for example, by a stationary disturbance variable that influences the intensity of the measured radiation. This can be a temperature control element such as the internal cooling of the blown film line.
  • tolerance limits are defined in particular around the mean value line. As long as these tolerance limits are undercut, an assignment to the category of stationary deviations takes place. In the other case, an assignment to the dynamic deviations takes place. In this way it is possible to compensate for stationary deviations, for example through one-time changes in the recipe, process and/or machine parameters. In the case of dynamic deviations, these must be examined regularly and compensated if necessary or regularly.
  • the time course of locations of the same intensities is compared for at least two different intensities.
  • the actual curve shapes can be compared with one another.
  • deviations from the mean line can be compared with each other, especially after such a deviation has occurred. If the comparison is also carried out for the same angular positions in relation to the circumferential direction of the film bubble, it is not only possible to determine the propagation of the deviation in relation to the transport direction, but also transversely to it, so that the search for causes of the deviations is made easier.
  • the distance between the locations of the same intensity and/or their mean lines per intensity interval and/or per temperature interval derived therefrom can be a measure of the cooling rate of the film bubble at these locations.
  • temperature gradients for the film bubble can be derived. From a characteristic course of a temperature gradient is in turn the Location of the frost zone of the film bubble can be determined. If several characteristic curves can be derived from a temperature gradient, several frost zones can also be inferred.
  • the temperature of a plastic melt is usually varied at the respective extruder and/or within the die. It is therefore advantageous to change the melt temperature of at least one plastic melt so that the frost lines of at least the second plastic melt are essentially at a common height.
  • time profile of locations with the same intensities for dynamic changes is compared and local propagations of the changes are determined from this, then it is advantageous to also determine the speed of propagation of the change.
  • speed of propagation of the change can help identify impending problems and/or disruptions at an early stage. For example, rapid propagation can indicate an imminent bladder rupture. Appropriate warnings can be issued and/or countermeasures initiated.
  • At least one deviation is assigned to a cause of the fault.
  • a cause of the fault can be, for example, a body which itself emits electromagnetic radiation, which arises in particular as a result of its own temperature.
  • This additional radiation leads to a change in the measurement, since now not only the radiation of the film bubble is detected.
  • Such a change in radiation can now be compensated for by simply subtracting the additional radiation.
  • later dynamic deviations can be better recognized.
  • the radiation of the body can be measured without a film bubble and/or the radiation can be determined on the basis of the temperature of the body.
  • deviations can be related in terms of time to changes in the recipe, process and/or machine parameters.
  • a temperature change at one of the extruders can lead to a change in the intensity of the radiation emitted by the film bubble with a time delay.
  • a control and computing device of the blown film systems on which the method is carried out can use this data and data relating to the transport speed of the melt or the film bubble to produce this dependency and thus the assignment.
  • a stationary deviation is assigned to an element of the blown film device.
  • a pattern of the deviations from the mean line can be determined at a certain point in time or for several points in time for several locations of the same intensities and compared with the shapes of components of the blown film system to determine the component responsible for the deviations to be able to determine. In this way, the influence caused by this component on the measured radiation intensity can be taken into account and, in particular, compensated.
  • stationary deviations which can be traced back to permanent causes, are stored in a memory device of the blown film plant and are taken into account in particular for subsequent production orders.
  • the influences of bodies described above, for example components of the blown film plant can be taken into account right from the start of processing the production order, without first having to identify this influence. This can lead to reduced rejects.
  • a display device on which the locations of the same intensities are shown. These locations of equal intensities are preferably represented as curves. The areas between two such curves are preferably shown in color, with a red coloring preferably being used at high intensities, which, following the usual spectral colors, change to a blue coloring as the intensity decreases.
  • an automatic contrast control of the representation can be carried out.
  • the brightness of the display is changed locally in order to display differences more clearly. This serves to improve the recognisability, in particular of deviations and faults.
  • a blown film system for producing and monitoring a film bubble, with an outlet nozzle from the outlet area of which the film bubble can be guided out and with a calibration device arranged downstream of the outlet nozzle, through which the blown film can be guided, also with: • a detection device for detecting the intensity of the radiation emitted from at least two different locations on the outer surface of the blown film by means of at least one optical sensor at different, successive points in time and for converting the detected intensities into electrical signals
  • a computing device for receiving and processing the electrical signals, locations of equal intensities being able to be determined with the computing device, and with the computing device being able to determine the time course of the locations of equal intensities.
  • FIG. 2 shows a detail from FIG. 1 with locations of the same wavelength shown
  • FIG. 1 shows a device 1 for producing a film tube, namely a blown film system 1, which initially comprises at least one extruder 2, with which plastic present, for example, in granular form is plasticizable.
  • the plastic melt produced in this way is fed via a line 3 to a nozzle head 4, from which this melt is transferred into a film bubble 6, so that this melt stream can be pulled out of an annular nozzle 5 (not visible in this figure) in the transport or take-off direction z.
  • a film bubble 6 that has not yet solidified is now present.
  • This is inflated in the tube formation zone from the inside by a slight excess pressure, so that it has a larger diameter inside the calibrating device 7 .
  • an air supply device 13 is provided, which is located within the annular nozzle 5 and extends partially in the direction of transport. This air supply device is supplied with air through the extrusion tool.
  • the film bubble solidifies by cooling, with part of the heat of the film bubble being given off to the environment, in particular by a temperature control device 8, which is often also referred to as a cooling ring because of its ring-like configuration enclosing the film tube.
  • the film bubble 6 After passing the calibration device 7, the film bubble 6 enters the effective range of a flattening device 9, in which the circular film tube is converted into an elliptical cross-section with an increasing eccentricity, until it finally forms a double-layer plastic film in the area of influence of the take-off device, which in particular comprises two take-off rollers 10 connected to each other on their sides.
  • a flattening device 9 in which the circular film tube is converted into an elliptical cross-section with an increasing eccentricity, until it finally forms a double-layer plastic film in the area of influence of the take-off device, which in particular comprises two take-off rollers 10 connected to each other on their sides.
  • the flattening device is rotatably arranged, with the axis of rotation being essentially aligned with the tube or axis of symmetry 11, which is indicated in FIG. 1 by a dot-dash line. Arrow 12 indicates that the flattening device can rotate.
  • FIG. 1 also shows a reversing device 15, which has the task of guiding the flattened film tube from the flattening device to the stationary roller 16 without causing damage.
  • the arrow 17 indicates that this tubular film, after having passed through the reversing device 15, is carried out for further processing, which is not specified in any more detail here.
  • At least one detection device 20 is arranged between the annular nozzle 5 and the calibration basket 7 as seen in the transport direction z, with which at least partial surface areas of the surface of the film bubble 6 can be detected.
  • the detection device 20 is arranged outside the film bubble 6, but directed towards it.
  • the detection device 20 can be attached directly or indirectly to any component of the blown film line 1 .
  • the detection device 20 it is also conceivable for the detection device 20 to be set up independently of the blown film system 1 on its own stand, for example a tripod, within the production facility.
  • FIG. 2 now shows a section of FIG. 1, essentially showing the film bubble 6 in the tube formation zone and the annular die 5, the temperature control device 8, the calibration device 7 and the detection device 20.
  • the detection device 20 comprises at least 32 detection elements, so that a sufficient number of points on the circumference of the tubular film can be detected simultaneously.
  • the detector has at least a so-called half-VGA resolution, ie at least 320 detection elements per side direction.
  • a detector preferably has a repetition rate of at least 3 Hz, preferably at least 9 Hz, i. H. that at least three and preferably at least nine detections can be carried out with each detection element per second.
  • Each of the detection elements is able to measure the associated intensity for one or more wavelength ranges. Particularly in the infrared radiation range, the radiation intensity is measured for each of these wavelength ranges and a temperature of the film tube is then derived from this.
  • a detection device 20 can be provided. However, in order to be able to scan a larger peripheral area, it is advantageous to design the detection device 20 to be movable around in the circumferential direction of the film bubble. Alternatively or additionally, at least one second detection device can be provided, with which surface areas of the surface of the film bubble 6 can be scanned, which at least partially cannot be scanned by the first detection device 20 .
  • FIG. 2 now shows the locations of the same intensity or the same temperature, the individual locations being connected to one another by a line 30 .
  • a family of such lines is shown, but these have not been given individual reference numerals.
  • Each of these lines thus represents the intensities or temperature profile on the surface of the film base 6, with the first line, viewed in the transport direction, representing the highest temperature and the last line representing the lowest temperature.
  • the broken line 31 represents an average line with which the mean location of the associated line 30 is represented. This line 31 runs orthogonally to the transport direction z and can therefore also be referred to as a contour line.
  • FIG. 2 shows as an example how elements of the blown film system 1 influence the temperatures of the film bubble 6 and thus the course of the locations of the same temperature.
  • the lines run strongly in the opposite direction to the transport direction z. This means that the film bubble 6 has a higher temperature in this area.
  • the detection device 20 and optionally other existing detection devices not only detect the radiation from the film bubble 6, but that the detected signal is a superimposition of the radiation from the film bubble 6 and the radiation of various other represents body.
  • One idea of the present invention is to take into account the influences of other bodies and in particular to subtract them when evaluating the measurements.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé pour surveiller un extrudat de soufflage de gaine (6) dans une zone de sortie après sa sortie d'un ajutage de sortie et avant qu'il ne quitte une installation de calibrage d'un dispositif de soufflage de gaine. Ce procédé comprend les étapes consistant : détecter la longueur d'onde du rayonnement émis par au moins deux endroits différents de la surface extérieure de la gaine soufflée au moyen d'au moins un capteur optique à différents instants successifs ; déterminer des endroits de même longueur d'onde ; déterminer la variation dans le temps des endroits de même longueur d'onde.
EP22821914.3A 2021-11-22 2022-11-22 Procédé pour surveiller un extrudat de soufflage de gaine et installation de soufflage de gaine Pending EP4436765A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP25218093.0A EP4699779A2 (fr) 2021-11-22 2022-11-22 Procédé de surveillance d'une bulle de film et installation de soufflage de film

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021213124 2021-11-22
PCT/EP2022/082782 WO2023089192A1 (fr) 2021-11-22 2022-11-22 Procédé pour surveiller un extrudat de soufflage de gaine et installation de soufflage de gaine

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP25218093.0A Division EP4699779A2 (fr) 2021-11-22 2022-11-22 Procédé de surveillance d'une bulle de film et installation de soufflage de film

Publications (1)

Publication Number Publication Date
EP4436765A1 true EP4436765A1 (fr) 2024-10-02

Family

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Family Applications (2)

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EP25218093.0A Pending EP4699779A2 (fr) 2021-11-22 2022-11-22 Procédé de surveillance d'une bulle de film et installation de soufflage de film
EP22821914.3A Pending EP4436765A1 (fr) 2021-11-22 2022-11-22 Procédé pour surveiller un extrudat de soufflage de gaine et installation de soufflage de gaine

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP25218093.0A Pending EP4699779A2 (fr) 2021-11-22 2022-11-22 Procédé de surveillance d'une bulle de film et installation de soufflage de film

Country Status (3)

Country Link
US (1) US20250001667A1 (fr)
EP (2) EP4699779A2 (fr)
WO (1) WO2023089192A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN116653273B (zh) * 2023-08-01 2023-09-22 沈阳东源包装制品有限公司 一种塑料膜吹膜工艺及控制方法

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BR112021015837A2 (pt) * 2019-03-15 2021-10-13 Dow Global Technologies Llc Método
JP7315359B2 (ja) * 2019-03-29 2023-07-26 住友重機械工業株式会社 インフレーション成形装置
DE102020127196A1 (de) * 2019-10-15 2021-04-15 Reifenhäuser GmbH & Co. KG Maschinenfabrik Blasfolienanlage, verfahren zum herstellen einer blasfolienbahn und damit hergestellte folie
WO2021219734A1 (fr) * 2020-04-28 2021-11-04 Windmöller & Hölscher Kg Identification de film soufflé dans un système de film soufflé

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