WO2021069474A1 - Installation de film soufflé et procédé de fabrication de films ou de bandes de film tubulaires - Google Patents

Installation de film soufflé et procédé de fabrication de films ou de bandes de film tubulaires Download PDF

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Publication number
WO2021069474A1
WO2021069474A1 PCT/EP2020/078068 EP2020078068W WO2021069474A1 WO 2021069474 A1 WO2021069474 A1 WO 2021069474A1 EP 2020078068 W EP2020078068 W EP 2020078068W WO 2021069474 A1 WO2021069474 A1 WO 2021069474A1
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WO
WIPO (PCT)
Prior art keywords
film
thickness
film web
layer
web
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.)
Ceased
Application number
PCT/EP2020/078068
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German (de)
English (en)
Inventor
Martin Backmann
Henning Voss
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 EP20788754.8A priority Critical patent/EP4041524A1/fr
Publication of WO2021069474A1 publication Critical patent/WO2021069474A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C48/001—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
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/92—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
    • 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
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness

Definitions

  • the invention relates to a blown film system for producing film tubes or film webs and a method for producing film tubes or film webs.
  • a plastic film is often produced on blown film systems in which a nozzle head is provided which has a nozzle gap which is in particular circular. A plastic melt is pressed or extruded from this nozzle head, so that a film tube is created.
  • One of the devices following in the transport direction of the film tube is a flattening device and / or squeezing device, with which the film tube can be flattened, so that a double-layer film web is created from the circular film tube, the two layers in particular being connected to one another along their longitudinal edges.
  • the invention also relates to such
  • Blown film systems which comprise a stretching unit with which the double-layer film web can be stretched in its transport direction.
  • a stretching unit with which the double-layer film web can be stretched in its transport direction.
  • Such a stretching unit is often referred to as an MDO (Machine Direction Orientation).
  • EP 2 277 681 A1 discloses such a blown film line.
  • the invention described there has set itself the goal of increasing the usable width of the film tube so that less waste is produced. This happens in that at the points at which a thickening occurs within the stretching device due to the so-called neck-in, thin points are produced in advance, so that the desired film thickness is created here, which can then be used. Nevertheless, a considerable part of the film has to be cut off - the so-called edge trim - which is then usually waste. Apart from the resulting waste costs, this is in particular not very environmentally friendly. In addition, the quality of the films produced in this way can be restricted due to fluctuations in thickness.
  • the object of the present invention is therefore to propose a blown film plant and a method with which the usable width of the film web can be increased again in order to further reduce the cost of filling and the amount of waste. According to the invention, this object is achieved by all of the features of claim 1. Possible configurations of the invention are specified in the dependent claims.
  • a first and at least one second thickness measuring device are provided downstream for measuring the thickness of layers of the film web. It is provided that the thickness of an individual layer of the film web can be measured with at least one of the thickness measuring devices.
  • a thickness measuring device is to be understood as a device with which a thickness profile of a film web can be created in a direction which is at least partially transverse to the transport direction of the film web.
  • a thickness is to be understood as a thickness profile in which locations in the transverse direction are each assigned a thickness measurement value.
  • such a thickness measuring device can comprise a thickness measuring head traversing in the transverse direction of the film web, a thickness measurement being able to be carried out after a short movement of the measuring head so that the thickness profile already described can be generated.
  • an inclined thickness profile is created thus not only includes a transverse component, but also a longitudinal component, which, however, is usually not taken into account.
  • a thickness measuring device is provided - as disclosed in the prior art - but a second thickness measuring device, at least one of the thickness measuring devices measuring a single layer of the film web.
  • the prior art only the thickness of the double-layer film web is measured, so that, for example, a thick point and a thin point that lie directly on top of one another are not recognized as such.
  • the measurement of a single layer can be carried out in different ways, which are discussed in more detail below.
  • At least one longitudinal separating device is provided with which the double-layer film web can be separated into a first and an optional second film web, each with one layer, the separation being able to be carried out in particular on or near the side edges connecting the double-layer film web.
  • a longitudinal separating device can therefore be provided with which one side edge of the double-layer film web can be opened or separated while the second side edge remains. In this case, the double-layer film web can be folded out so that a double-wide, single-layer
  • Foil web can be generated.
  • two longitudinal separating devices can be provided, with which both side edges can be opened or separated, so that two individual film webs, one on top of the other, each with one layer can be produced.
  • “Ripping” can be understood to mean a lengthwise cutting directly in the side edge, with generally no waste being produced.
  • Separatating is understood to mean that a longitudinal separating device takes a distance from the relevant side edge, so that a strip is created which belongs to the waste. The opening or severing of at least one side edge leads a simple way to measure the thickness of just one layer.
  • the thickness of the double-layer film web and with the at least one second thickness measuring device the thickness of an individual layer of the film web can be measured.
  • the first thickness measuring device can be arranged near and downstream of the stretching device.
  • the at least one second thickness measuring device can be arranged at a point at which the two layers, which have already been separated by a separation or separation, have also been removed from one another. This is preferably done shortly before the individual layers of the film web are wound onto a winding in a winding device.
  • the thickness of the layer of the first film web can be measured with the first thickness measuring device and the thickness of the layer of the second film web can be measured with the second measuring device.
  • the layers that have already been separated by a separation or separation are also at a distance from one another. This in turn takes place preferably shortly before the individual layers of the film web are wound up on a winding in each case in a winding device.
  • three thickness measuring devices can be provided downstream of the stretching device, the thickness of the double-layer film web being measured with the first thickness measuring device and the thickness of an individual layer of the film web being measured with the two second thickness measuring devices. With such an arrangement it is possible to react very flexibly to the measurement requirements.
  • the thickness of the layer of the first film web can be measured with the first thickness measuring device and the thickness of the layer of the second film web can be measured with the second measuring device, the thickness measuring devices each having the same distance from the stretching device as seen along the transport paths of the layers.
  • the measured thickness profiles can be compared directly with one another and thus a regulation of the Improve the film thickness profile so that there is a minimum of waste.
  • the traverses of traversing thickness measuring devices are coordinated so that the recording of the thickness profile takes place not only at the same distance in the transport direction of the individual layers of film from the stretching device, but also at the same transverse positions.
  • the first thickness measuring device and the second thickness measuring device in relation to the transport path of the double-layer film webs and / or the
  • Transport paths of the first film web and / or the second film web have a different distance from the stretching device, an evaluation device being provided with which a thickness profile can be determined for each layer, with the evaluation device taking into account the distance between the thickness measuring devices.
  • the evaluation device which takes into account the distance between the thickness measuring devices, it is possible to assign the measured thickness profiles to the same point on the double-layer film web.
  • the evaluation device also takes into account the time that a point on the film web needs to cover the path between the first and the second thickness measuring device. In this way it is made possible for the thickness profiles to be comparable with one another or even for a differential thickness profile to be able to be created. The latter is important in the event that the first thickness measuring device measures a thickness profile of the double-layer film web.
  • Traversing are coordinated so that the recording of the thickness profile not only with regard to the distance of the thickness measuring devices in the transport direction of the individual layers of film web to the stretching device, but also the transverse positions of the respective thickness measuring devices can be coordinated.
  • At least one winding device is provided for winding up at least one film web, with at least one layer of the film web being able to be measured with at least one thickness measuring device when this film web has reached the roll. Consequently, not only the thickness of an individual layer of the film web can be determined, but also a thickness profile of the roll. The thickness profile of the roll or rolls can thus ultimately be able to be taken into account when controlling or regulating the thickness profile in the blown film system.
  • At least one device for embossing a thickness profile on the film tube and / or the double-layer film web and / or the first and / or the second film web, the device comprising at least one of the following elements:
  • Fluid application device with which a fluid with a temperature and / or with a volume flow on the film tube and / or the
  • Foil web is conductive
  • a contact element in particular a roller, which contacts the film tube and / or the film web and controls the temperature.
  • a fluid application device can be a segmented fluid nozzle, in particular a fluid cooling ring, with which fluid flows can be generated over the width of the film web or over the circumference of the film tube, which can have different temperatures and / or volume flows in segments.
  • a fluid can in particular be in gas, preferably air.
  • An infrared radiation source can be used to produce local heating at certain points on the circumference of the film tube or in the transverse direction of the film web in order to reduce the thickness of the film tube at these points, in particular to produce thin spots.
  • An electromagnetic radiation source can serve the same purpose, with local heating being able to be caused in particular by absorption of radiation by the material of the film web or the film tube.
  • Another possibility of causing local heating of the material is to provide a contact element which makes contact with the film tube or the film web.
  • Such a contact element can then comprise different, in particular segment-wise, temperatures over the width of the film web and / or over the circumference of the film tube, which are passed on directly to the material of the film web or the film tube.
  • Such a contact element can preferably be a roller or a plurality of rollers.
  • the actual position of a thickness profile impressed on the film tube can be determined and is comparable with the target profile, a device for impressing a thickness profile being controllable with a control device, in particular the thickness profiles of the individual film webs being against one another.
  • the thickness profile of the film webs is regulated.
  • a further Thickness measuring device can be provided with which a thickness profile of the film tube can be determined. It is advantageous to compare this thickness profile with the thickness profiles of the individual film layers. Such a comparison is particularly advantageous in blown film systems in which a device for embossing a thickness profile in the transport direction of the
  • the film tube of the flattening device and / or the squeezing device is arranged upstream and in which a film reversing device is provided, with which the later layers can be shifted against each other during the laying flat and / or the squeezing off.
  • a film reversing device is generally advantageous for producing a good roll, but has the disadvantage that any thick or thin areas that may be embossed also shift in an undesired manner. This effect can be detected with the present invention and compensated for with the aid of the control system just described.
  • Film tube and / or the film web between the lay-flat device and / or the squeezing device and the film reversing device can be arranged.
  • the film material is still warm and can be stretched with less heat.
  • the stretching device must also be reversed.
  • An arrangement downstream of the film reversing device is also advantageous, since a stationary system can be designed more simply with regard to the energy supply.
  • the film tube is flattened and / or squeezed off in order to produce a double-layer film web from the film tube, a second thickness measuring device, the thickness of layers of the film web is measured, with at least one of the Thickness measuring devices the thickness of a single layer of the film web is measured.
  • the described invention is particularly advantageous in combination with films containing raw materials with a density of more than 0.93 g / cm 3 .
  • Such films have great rigidity, so that an adjustment of the thickness profile according to the invention leads to a particularly high quality of the films.
  • Preferred raw materials here are polyethylenes, in particular FIDPE (High-Density Polyethylene)
  • FIG. 1 side view of a device for Fier ein a
  • FIG. 2 representation of a stretching device
  • FIG. 1 shows a device 1 for setting a film tube, which initially comprises at least one extruder 2 with which plastic, for example in granulate form, can be plasticized. Via a line 3 the plastic melt produced in this way is fed to a nozzle head 4, where this melt is converted into a cylindrical melt flow, so that this melt flow can be withdrawn from an annular gap 5 (not visible in this figure) in the withdrawal direction z. Now there is a film tube 6 that has not yet solidified. This is inflated from the inside by a slight overpressure, so that it has a larger diameter within the optional calibration device 7.
  • the film tube is solidified by a fluid application device 8, which is also often referred to as a cooling ring because of its ring-like configuration surrounding the film tube. Because of the cooling effect, one often speaks of a temperature control device.
  • the film tube 6 After passing the calibration device 7, the film tube 6 reaches the effective area of a lay-flat device 9, in which the circular film tube is first converted into an elliptical cross-section with increasing eccentricity, until it finally has two film webs lying on top of one another at their side edges in the area of influence of the squeezing device are interconnected, forms. In other words, there is now a double-layer film web 24.
  • the flattening device 9 is arranged to be rotatable, the axis of rotation essentially being aligned with the hose axis 11, which is indicated in FIG. 1 by a dash-dotted line.
  • the rotatability of the flattening device is indicated by arrow 12.
  • the fluid application device 8 is divided into different circumferential sections. Each circumferential section of the fluid application device is capable of the film tube with one over the circumference of the
  • Air is preferably provided as the fluid. This allows the person concerned
  • the circumferential section of the film tube assigned to the circumferential section of the fluid application device is individually temperature-controlled, in particular less cooled or even heated.
  • the circumferential sections of the film tube which due to the lower cooling effect of the fluid application device, “flow away” to a great extent, form a thin point 13. With a greater cooling effect, on the other hand, flowing is reduced, so that thick spots are formed here. Thick places and thin places have a greater or lesser thickness compared to the average thickness of the film tube.
  • the thin point So that the thin point always arrives at a fixed position of the lay-flat device, it is also necessary for the thin point to move along the circumference, which is indicated in the figure by the arrow 14.
  • This “wandering” of the thin point is achieved in that the parameters of the circumferential section of the fluid application device closest in the direction of arrow 14 are changed in order to now generate a thin point adjacent to the circumferential section of the film tube which currently has a thin point.
  • the current thin point is moved back in that the relevant circumferential section of the fluid application device now again has a stronger cooling effect on the angular section assigned to it.
  • a thickness measuring device 18 can be provided which, viewed in the transport direction z, is preferably arranged between the calibration device 7 and the flattening device 9.
  • the thickness measuring device 18 comprises, for example, a measuring head which can determine the thickness of the wall of the film tube at its current position.
  • the measuring head can be designed to be movable around the film tube in order to be able to repeat the measurement at different positions, which is represented by the double arrow 19.
  • the distance between two positions at which a thickness measurement can be carried out can be variably adjustable .
  • it can be arranged displaceably on a rail 20, the rail 20 engaging in a ring around the film tube.
  • an evaluation and / or control device 40 is provided with which the fluid application device can be controlled so that a desired thickness profile can be generated.
  • This thickness profile or the control parameters required for this can be generated dynamically for the individual segments of the fluid application device, so that the resulting thickness profile moves in phase and in particular with an offset with the rotation of the flattening device.
  • the offset is preferably 0.
  • the data line 41 is available for the transmission of control commands.
  • the thickness measuring device 18 can measure a thickness profile. Measured values (in raw form or already as a thickness profile) are fed to the evaluation and / or control device 40 via the data line 42.
  • the evaluation and / or control device 40 can now evaluate the measured thickness profile and, in particular, modify the control parameters in such a way that the measured thickness profile matches the desired thickness profile. A control loop is thus made available. According to the invention, it is additionally provided that the evaluation and / or control device 40 also take into account the thickness profiles that have been recorded with the thickness measuring device 38 and with at least one of the thickness measuring devices 45. The influencing factors of these individual thickness measuring devices can be weighted and taken into account when modifying the control commands. In particular, it is conceivable that the thickness profiles measured by the thickness measuring device 45 are primarily taken into account for influencing the offset.
  • control parameters that are necessary for setting the target profile are stored in the event of an inflow to a turning point and are mirrored again or taken into account in the event of an expiration from a turning point.
  • the values can be taken into account in such a way that the increase in the offset is set with the same values. This prevents the sluggishness of the control loop from leading to undesirable thick or thin areas.
  • the expression “fluid application device” is a synonym for all possibilities of influencing the thickness profile of the film web. It can thus other or further devices for impressing a thickness profile on the film tube and / or the double-layer film web and / or the first and / or the second film web can be provided.
  • 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 damage occurring.
  • the arrow 17 indicates that this film tube is now being guided for further processing, which is explained in more detail in the following figures.
  • Reversing means that various elements, in particular the individual deflection rollers and turning bars, move back and forth between two end points. This movement is preferably a rotary or pivoting movement. The end points can therefore also be referred to as turning points.
  • FIG. 2 now shows, by way of example, a stretching device 30 which is connected inline to the device 1 shown in FIG.
  • a stretching device is not limited to the embodiment described below.
  • Inline here means that the double-layer flat web 24 is supplied from the device 1 directly from the production process, that is to say without transporting the film web in a manageable form.
  • the film web 24 runs into the stretching device 30 along the web transport direction z.
  • it is first guided from the guide roller 31 to the sizing rollers 32, each of which is designated by the reference numeral 32.
  • the task of the sizing rollers 32 is to bring the film web 24, which has already been completely or partially cooled, back to a temperature which is sufficient for a stretching or stretching process.
  • Stretching units usually carry out stretching processes, ie the film has already cooled down and has to be brought back to the stretching temperature. Stretching processes, such as those used in blown film extrusion, are also conceivable (especially if the stretching device follows a film extrusion line in-line). In this case, the film web has not yet cooled down completely.
  • the film web 24 After the film web 24 has been brought back to a stretching temperature in the area 28 of the heating rollers 32, it runs into the area of the stretching roller 22 and the nip roller 33 and crosses the gap between these two rollers 22, 33 Draw nip 21 in order to then reach the surface of the draw roller 23 and leave the draw nip 21.
  • This stretching roller 23 forms a roller gap with the nip roller 36. Due to a lower peripheral speed of the first pair of rollers 22, 33 compared to the second pair of rollers 23, 36, the film web 24 is elongated, that is to say stretched, in the stretching gap 21. Two effects occur here which are not desired and which make it necessary to separate longitudinal strips on the sides of the film webs.
  • the first effect is a reduction in the film width during stretching (the so-called neck in).
  • the second effect is a thickening of the edges of the film web. Provision can be made for the size of the stretching gap, that is to say the distance between the detachment edge of the film web 24 from the roller 22 to the edge of the film web to hit the roller 23, to be variable. In this way it is possible to influence the size of the neck-in and / or the thickening of the film web at its edges.
  • the film web 24 After passing through the stretching gap, of which there can also be several in a row, the film web 24 reaches the region 29, which comprises cooling rollers each designated by the reference numeral 37, in which the film web 24 is cooled again. After leaving this area 29, the film web 24 has again reached a somewhat lower temperature, so that its surface can withstand the transport over the guide roller 31 in the transport direction z without further damage.
  • the film web 24 is then in Further conveyed in the direction of arrow 34 and at the end of an optional further processing is fed to a winding device in which the film web is wound up as a double-layer film web or separately in two individual layers. In principle, it is not excluded that the film web or the individual layers of the film web receive longitudinal cuts and are wound up next to one another in several panels.
  • a cutting or puncturing device 35 can be provided with which the double-layer film web can be cut or punctured so that air or another gas that could still be within the double-layer film web could escape. This measure leads to an improved quality of the stretching process and to an increased accuracy of the thickness profiles to be measured of the double-layer film web.
  • the film web along or near one
  • Side edge is cut lengthways so that the double-layer film web is only connected via one side edge. It may also be desirable to cut the two-ply film web at both of its side edges. This is necessary in particular from certain thicknesses of the film web, since the air transport to a side edge of the film web may not take place sufficiently quickly.
  • a thickness measuring device 38 is provided with which a thickness profile of the double-layer film web can be recorded after it has been stretched.
  • a thickness profile of the double-layer film web can be recorded after it has been stretched.
  • a contrast medium such as a metal sheet
  • the thickness measuring device 38 can in turn be a measuring head that can be moved along an at least partially transverse to Transport direction extending rail is arranged.
  • the measuring head is in turn able to measure the thickness of the film web 24 at its current position.
  • the measuring head can then be moved to a further position at which a further measurement can be carried out.
  • the measuring head carries out measurements at adjustable time intervals, but the speed of movement is variable.
  • Thickness measuring device 38 is designed and set up to also measure beyond the edge of the film web in order to be able to make statements about the current width of the film web.
  • FIG. 3 shows a film separating device 50, which is shown here in connection with two winding points 60, 61, but can also be provided independently of this.
  • the film web 34 can already have been subjected to a pretreatment before entering the film separating device.
  • a first edge trim can already have taken place in order to cut off part of the thickened areas at the edge, which leads to an improved quality of an optional pretreatment.
  • Further cutting devices 51 are provided within the film separating device, each of which carries out the final edge trimming on one edge of the still double-layered film web.
  • the double-layer film web is guided over rollers 52 and 53, which primarily ensure the web tension necessary for the edge trimming.
  • the double-layer film web is separated into two individual layers, which, however, are still directly on top of one another.
  • the actual separation of the layers takes place by the rollers 54, 55, which form a roller gap. After passing through the nip, the The first layer is fed to the first winding point 60, where it runs over various additional rollers and is wound onto the winding 62.
  • a second thickness measuring device 45 is provided downstream of the separating device, the structure and mode of operation of which is preferably similar to that of the thickness measuring device 38.
  • the measurement results (in raw form or as an evaluated thickness profile) are fed to the evaluation and control device 40 via a data line 44, for example by wire and / or wirelessly.
  • the second layer can be fed to the winding point 61, the structure and function of which is identical to the first winding point.
  • a second thickness measuring device can also be provided for measuring the second position. Reference is made here to the description in the previous paragraph with regard to structure and mode of operation.
  • the thickness measurement profiles that are recorded downstream of the separating device can be continuously added up by the evaluation and / or control device in order to be able to record a roll sum profile, i.e. the addition of the thickness profiles of the individual layers in a roll.
  • a roll sum profile i.e. the addition of the thickness profiles of the individual layers in a roll.
  • deviations in the film thickness from the mean film thickness i.e. thick and / or thin areas
  • a stretching device is provided, this can result in further thick or thin areas that can no longer be compensated for with a reversal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une installation de film soufflé pour la fabrication de films ou de bandes de film tubulaires comprenant une tête de buse pour extruder un film tubulaire, un outil de pose à plat et/ou un dispositif de pressage destiné à poser à plat et/ou presser un film tubulaire afin de produire une bande de film à double couche à partir du film tubulaire, et un dispositif d'étirage, par lequel la bande de film à double couche peut être étirée dans la direction longitudinale. Au moins un premier et au moins un second dispositif de mesure d'épaisseur pour mesurer l'épaisseur de couches de la bande de film sont disposés en aval du dispositif d'étirage, l'épaisseur d'une couche unique de la bande de film pouvant être mesurée au moyen d'au moins un des dispositifs de mesure d'épaisseur.
PCT/EP2020/078068 2019-10-09 2020-10-07 Installation de film soufflé et procédé de fabrication de films ou de bandes de film tubulaires Ceased WO2021069474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20788754.8A EP4041524A1 (fr) 2019-10-09 2020-10-07 Installation de film soufflé et procédé de fabrication de films ou de bandes de film tubulaires

Applications Claiming Priority (2)

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DE102019215492.1 2019-10-09
DE102019215492.1A DE102019215492B4 (de) 2019-10-09 2019-10-09 Blasfolienanlage und Verfahren zur Herstellung von Folienschläuchen oder Folienbahnen

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WO2021069474A1 true WO2021069474A1 (fr) 2021-04-15

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EP (1) EP4041524A1 (fr)
DE (1) DE102019215492B4 (fr)
WO (1) WO2021069474A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2024083902A1 (fr) 2022-10-18 2024-04-25 Windmöller & Hölscher Kg Dispositif de refroidissement pour films tubulaires en plastique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020000334A1 (de) 2020-01-21 2021-07-22 Hosokawa Alpine Aktiengesellschaft Vorrichtung und Verfahren zur monaxialen Längenänderung von Folienbahnen
DE102022000351A1 (de) 2022-01-29 2023-08-03 Hosokawa Alpine Aktiengesellschaft Verfahren und Vorrichtung zur Foliendickenregelung von gereckter im Folienblasverfahren hergestellter Schlauchfolie

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US3577497A (en) * 1969-04-28 1971-05-04 Kohjin Co Method for heat-setting biaxially stretched films of thermoplastic materials
DE2658518A1 (de) * 1976-12-23 1978-06-29 Reifenhaeuser Kg Verfahren und anlage zur herstellung von blasfolien aus thermoplastischem kunststoff
EP0335411A2 (fr) * 1988-03-31 1989-10-04 Idemitsu Petrochemical Co. Ltd. Procédé et dispositif de fabrication d'un film biaxialement orienté
EP2277681A1 (fr) 2009-07-13 2011-01-26 HOSOKAWA ALPINE Aktiengesellschaft Procédé et dispositif de réglage de l'épaisseur d'une lamelle de soufflage étirée
WO2016059025A1 (fr) * 2014-10-15 2016-04-21 Windmöller & Hölscher Kg Procede et dispositif de fabication et de traitement d'un tube de film
WO2019138311A1 (fr) * 2018-01-12 2019-07-18 Colines S.P.A. Procédé d'ajustement du profil d'un film dans des lignes d'extrusion-soufflage, film ajusté et bobine

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DE102011085735A1 (de) * 2011-11-03 2013-05-08 Windmöller & Hölscher Kg Reckwerk und Verfahren zum Längen von Folienbahnen
US20190255754A1 (en) * 2016-10-18 2019-08-22 Reifenhauser GmbH & Co. KG Maschienenfabrik Measuring device and method for measuring two or three-dimensional film topography and method for recognising in-line patterns in two or three-dimensional film topography
DE102017007140A1 (de) * 2016-10-18 2018-04-19 Reifenhäuser GmbH & Co. KG Maschinenfabrik Verfahren zum indirekten Ableiten einer systematischen Abhängigkeit zwischen einer Einstellgröße und einer optischen Eigenschaft einer Folienbahn, Verfahren zum Anpassen der Qualität einer Folienbahn, Verfahren zum Herstellen einer Folienbahn sowie Vorrichtung zum Herstellen einer Folienbahn

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US3577497A (en) * 1969-04-28 1971-05-04 Kohjin Co Method for heat-setting biaxially stretched films of thermoplastic materials
DE2658518A1 (de) * 1976-12-23 1978-06-29 Reifenhaeuser Kg Verfahren und anlage zur herstellung von blasfolien aus thermoplastischem kunststoff
EP0335411A2 (fr) * 1988-03-31 1989-10-04 Idemitsu Petrochemical Co. Ltd. Procédé et dispositif de fabrication d'un film biaxialement orienté
EP2277681A1 (fr) 2009-07-13 2011-01-26 HOSOKAWA ALPINE Aktiengesellschaft Procédé et dispositif de réglage de l'épaisseur d'une lamelle de soufflage étirée
WO2016059025A1 (fr) * 2014-10-15 2016-04-21 Windmöller & Hölscher Kg Procede et dispositif de fabication et de traitement d'un tube de film
WO2019138311A1 (fr) * 2018-01-12 2019-07-18 Colines S.P.A. Procédé d'ajustement du profil d'un film dans des lignes d'extrusion-soufflage, film ajusté et bobine

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Title
See also references of EP4041524A1

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024083902A1 (fr) 2022-10-18 2024-04-25 Windmöller & Hölscher Kg Dispositif de refroidissement pour films tubulaires en plastique

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EP4041524A1 (fr) 2022-08-17
DE102019215492A1 (de) 2021-04-15

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