EP4041526A1 - Procédé pour démarrer ou terminer la production d'un film dans une machine à film, machine à film et produit programme d'ordinateur - Google Patents

Procédé pour démarrer ou terminer la production d'un film dans une machine à film, machine à film et produit programme d'ordinateur

Info

Publication number
EP4041526A1
EP4041526A1 EP20786561.9A EP20786561A EP4041526A1 EP 4041526 A1 EP4041526 A1 EP 4041526A1 EP 20786561 A EP20786561 A EP 20786561A EP 4041526 A1 EP4041526 A1 EP 4041526A1
Authority
EP
European Patent Office
Prior art keywords
film
setting
parameters
production
machine
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
EP20786561.9A
Other languages
German (de)
English (en)
Inventor
Karsten Golubski
Tobias Kulgemeyer
Martin Backmann
Tim Kirchhoff
Jens ALTHERMELER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP4041526A1 publication Critical patent/EP4041526A1/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
    • B29C48/03—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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0096—Trouble-shooting during starting or stopping moulding or shaping apparatus
    • 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
    • B29C48/001—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
    • B29C48/269—Extrusion in non-steady condition, e.g. start-up or shut-down
    • 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
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • 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
    • B29C48/355—Conveyors for extruded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0027—Cutting off
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0036—Slitting
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C2948/92485—Start-up, shut-down or parameter setting phase; Emergency shut-down; Material change; Test or laboratory equipment or studies
    • 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
    • B29C2948/92561—Time, e.g. start, termination, duration or interruption
    • 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
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—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
    • B29C2948/92819—Location or phase of control
    • B29C2948/9298—Start-up, shut-down or parameter setting phase; Emergency shut-down; Material change; Test or laboratory equipment or studies
    • 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
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed

Definitions

  • the invention relates to a method according to claim 1, a method according to claim 13, a film machine according to claim 14 and a computer program product according to claim 15.
  • the object of the present invention is therefore to propose a method and a film production machine with which the efficiency of film production can be increased.
  • start of film production begins with an external trigger that issues the order to start. This trigger is detected by the control device, which then in particular initiates all or at least most of the necessary subsequent steps.
  • start parameters are set in a further step, in particular by the control device, which enable or facilitate the drawing in of the film or the plastic strand through all of the components required for the production of the desired film .
  • a further step in the method is the provision of plastic material, the plastic material that has already been melted being here, which swells out of an extrusion nozzle and / or has already been drawn in by all of the aforementioned components.
  • Another step is the start of film production, whereby plastic material continuously escapes from an extrusion nozzle during film production, is transported and finally wound up.
  • the plastic material can be processed further, the possible processing steps being named and / or explained in more detail later and in some cases in connection with advantageous method steps.
  • film production parameters that are necessary for the positioning of the desired film are necessary.
  • These film production parameters primarily include settings of the film machine (mechanical parameters, electrical parameters, pneumatic parameters, etc.), the type of raw materials, their quantities and their inflows, parameters of the film and their quality features.
  • the word “recipe” is often used as a generic term for all these parameters and settings.
  • the desired film is thus produced after a short period of time, the desired film in particular meeting the user requirements.
  • the detection of a start request includes the registration of the actuation of a switch on a control device by the operator. It is therefore primarily up to the operator to initiate the start of film production.
  • the operator requests the start, but in particular also indicates to the control device that he is ready to receive information, requests, error messages, etc. and, if necessary, to react to them.
  • a switch can be any input instrument.
  • a switch is an operating surface on a monitor of the control device.
  • An input by the operator can generally take place within the scope of the invention by: pushing a button, voice input, gesture control, mouse click, touching a control panel on a touchscreen monitor, but also using a mobile device, which is particularly wirelessly connected to the control device.
  • the acquisition of a start request can also include the acquisition of an electronic signal.
  • This can be the case, for example, when a start is to be triggered with a mobile operating unit or from a central computer, for example from a central computer in the film manufacturing company.
  • the operator indicates his readiness to carry out the start process via an input unit of the control device
  • a requirement for the operator can be, for example, that the operator must confirm that raw materials have been made available for extrusion.
  • the control device issues a request to draw in film material over or through a component of the film machine.
  • This requirement is directed in particular to the operator if it is necessary to pull the film material through the film machine. In various cases, however, it is not necessary to already wind up this film material. It is even possible for all of the drives, for example of feed rollers, to be switched off.
  • the request for drawing in film material can also be given in the form of control commands, for example to drives of conveyor rollers. In this case, the operator can have an observer function so that he can operate the control device accordingly in the event of any errors.
  • information about the drawn-in of the film material is recorded before the start of film production.
  • This information can have been given by at least one sensor, or by the operator who makes a corresponding input into the control device.
  • extremal parameters are meant, in particular, maximum values that a mechanically actuatable component of the film machine can assume, for example the greatest width that a calibration basket can approach.
  • Start parameters can, however, also be a set of parameters which are particularly suitable for drawing in film material.
  • stored recipe and production data from a previous film production, in particular a film production with the same or a similar recipe can serve as start parameters either directly or in a form adapted for the start. In this case, large adjustment paths, in particular of mechanical components, are avoided, so that film production can be started quickly.
  • the film is wound onto at least one roll during or after the start of film production.
  • the setting of start parameters comprises at least one of the following steps, with the control device in particular issuing a control command to carry out the step:
  • Foil material is cooled directly or indirectly
  • Foil machine relative to a main axis of inertia of the foil material
  • a web break monitoring is switched off.
  • the calibration basket is moved to its highest position (maximum distance from Blow head).
  • the calibration basket is set to a starting width, in particular its maximum width.
  • a support cage is moved to a starting value.
  • a thickness measuring device is switched off.
  • a trigger is brought into a starting position.
  • a squeezing roller of the squeezing device is swiveled away.
  • pressure rollers are swiveled and stretch factors are set to 1, ie stretching rollers that have different peripheral speeds in the film production process are set to the same peripheral speeds. Furthermore, further pressure rollers are swiveled away in the rail transport.
  • a further step it is advantageous if at least some of the web drives are driven backwards before, during or immediately after setting the start parameters, so that in particular a film web that is still in the transport path from the previous film production is opposite to the transport direction in the film production is moved. This makes it possible to attach the newly emerging film bubble to the end of the old film web, so that the new film bubble and the film web produced from it can be easily pulled through the film machine after being attached.
  • This step can, for example, also be requested by the operator by means of an input.
  • control device in particular the control device sending at least one control command to the
  • Components deliver: an extruder, a cooling ring, an air guiding device, internal bubble cooling, a calibration basket, a flattening device, a take-off device a reversing device a turning bars a stretching unit a cross-cutting device in a winder a longitudinal cutting device a transport roller a flatness measuring device a thickness measuring device a winding device a supply device for a raw material.
  • the film material can be made available.
  • the completion of the setting of the start parameters can be displayed beforehand on a monitor, in particular on a monitor of the control device.
  • the film material is provided, there is preferably another step of detecting a request to start the extrusion. This means that the operator can once again confirm separately that he is prepared to receive the plastic material for the purpose of drawing it into the machine.
  • the step of providing the film material comprises, in particular, the steps of starting extruders for producing plastic melt from a granulate and switching on at least one conveying device for conveying granulate.
  • a conveying device is designed, for example, as a suction conveyor. It is advantageous to start all the conveying devices necessary for film production.
  • the reverse driving of web drives can also take place parallel to the step of providing the film material. It is advantageous if the rail transport is started in a further step. This means that web tension rollers in particular are now driven, so that as soon as the plastic melt is pulled out of the nozzle of the blow head and connected to a feed belt that was previously placed through the transport path or to the film web from the previous film production, the new plastic material is drawn in can be done.
  • the web pulling rollers include, in particular, the take-off rollers, which have the task of pulling the plastic melt out of the nozzle head. In particular - if present - a feeder, a fixing mechanism and / or a stretching device are now also put into operation. A changing station can also be started within this step.
  • a bubble shape of the film material is first created, but also because it is usually laid flat for further transport within the film machine, the film bubble is punctured or cut to remove air, which remains between the layers of the flat film bubble, especially during the start-up process, to be able to remove.
  • the film bubble is usually limited to the area between the nozzle lip and a pair of squeeze rollers. Downstream of the pair of squeezing rollers, the film bubble is laid flat as completely as possible, i. In other words, no residual gas remains at any point on the film machine.
  • optimization includes, in particular, an approximation of recipe specifications, in particular the composition and thickness of individual layers of the film, thickness and / or width of the film, inflation and withdrawal parameters (biaxial stretching parameters).
  • a step is additionally carried out in which at least one control circuit is switched on in order to regulate at least one film production parameter.
  • a control loop can be, for example, the thickness profile of a film, the flatness or the transparency.
  • the above-mentioned object is also achieved by a method for ending film production in a film machine, in particular a blown film machine, with a control device having the following steps • Capturing a termination request
  • the step of setting termination parameters enables the film transport to be slowed down in a controlled manner until it comes to a standstill, so that a remainder of the film produced remains in the film system. This in particular simplifies the drawing in of the film after restarting the film machine, which saves time.
  • a film machine in particular a blown film machine for carrying out a method according to one of claims 1 to 13, with at least one extruder for producing and providing molten plastic material, a nozzle device from which the molten plastic material can be pulled out in the form of film, at least one transport roller, at least one winding device with which it can be wound, and at least one control device which issues control commands for carrying out the steps of the method.
  • Fig. 1 side view of a device for setting a film tube
  • 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.
  • the plastic melt produced in this way is fed via a line 3 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.
  • 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 now lies a double-layer film web 24 before.
  • 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 tempered, in particular cooled to a lesser extent 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 method according to the invention for starting or stopping can be carried out.
  • a display device, in particular for displaying a status of the method, and an input device via which the operator can enter information are not shown.
  • the fluid application device can be controlled with the evaluation and / or control device 40, 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 do the measured Evaluate the thickness profile and, in particular, modify the control parameters so 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 is thus also possible to provide 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 is 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 stations, move back and forth between two end points. This movement is preferably a rotary or Swivel movements. 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 means that the double-layer flat web 24 is fed from the device 1 directly from the production process, i.e. 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.
  • the task of the heating 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 processes are usually carried out by stretching units, i. H. that the film has already cooled down and must be brought back to the stretching temperature. Stretching processes, such as those used in blown film extrusion, are also conceivable (in particular if the stretching device follows a film extrusion system inline). 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 with the nip roller 36 a nip. 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 conveyed further 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 is cut lengthways along or near a side edge, 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 which is arranged on a rail that is movable along a rail that extends at least partially transversely to the transport direction.
  • 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.
  • the thickness measuring device 38 is designed and set up, also over the edge of the film web 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 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.
  • 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)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de démarrage de la production d'un film dans une machine à film, en particulier une machine de soufflage de film, comprenant un dispositif de commande et comprenant les étapes suivantes : acquisition d'une demande de démarrage ; réglage des paramètres de démarrage ; fournture d'un matériau de film ; démarrage de la production de film ; et réglage des paramètres de production de film.
EP20786561.9A 2019-10-11 2020-10-07 Procédé pour démarrer ou terminer la production d'un film dans une machine à film, machine à film et produit programme d'ordinateur Pending EP4041526A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019215694 2019-10-11
DE102019215875.7A DE102019215875A1 (de) 2019-10-11 2019-10-15 Verfahren zum Starten oder Beenden einer Folienproduktion in einer Folienmaschine, Folienmaschine und Computerprogrammprodukt
PCT/EP2020/078069 WO2021069475A1 (fr) 2019-10-11 2020-10-07 Procédé pour démarrer ou terminer la production d'un film dans une machine à film, machine à film et produit programme d'ordinateur

Publications (1)

Publication Number Publication Date
EP4041526A1 true EP4041526A1 (fr) 2022-08-17

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Application Number Title Priority Date Filing Date
EP20786561.9A Pending EP4041526A1 (fr) 2019-10-11 2020-10-07 Procédé pour démarrer ou terminer la production d'un film dans une machine à film, machine à film et produit programme d'ordinateur

Country Status (5)

Country Link
US (1) US20240083083A1 (fr)
EP (1) EP4041526A1 (fr)
CN (1) CN114555326A (fr)
DE (1) DE102019215875A1 (fr)
WO (1) WO2021069475A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021112618A1 (de) * 2021-05-14 2022-11-17 Windmöller & Hölscher Kg Verfahren zur Herstellung einer Kunststofffolie in einer Folienextrusionsmaschine aus einer Gesamtmenge an Rohstoffen sowie Computerprogrammprodukt zur Durchführung des Verfahrens
CN114714600B (zh) * 2022-04-02 2022-11-01 浙江海利得复合新材料有限公司 一种基于tpu行程与冷却温度调节的tpu薄膜冷却成型装置
CN115320081B (zh) * 2022-10-11 2023-03-24 靖江市丽美塑料包装厂 一种塑料膜吹膜机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721609C2 (de) * 1977-05-13 1986-07-10 Reifenhäuser KG, 5210 Troisdorf Regeleinrichtung für eine Anlage zur Herstellung von Kunststoffblasfolien
US5104593A (en) * 1990-03-21 1992-04-14 Joseph Daniel R Method and apparatus for gauging and controlling circumference of extrusion-blown film
GB2243573B (en) * 1990-04-27 1993-10-27 Reifenhaeuser Masch Process for producing plastics foil
JPH05220839A (ja) * 1992-02-13 1993-08-31 Maruyasu:Kk インフレーション成形法簡易立上制御システム
US5727723A (en) * 1996-12-18 1998-03-17 Addex Design, Inc. Oscillating hauloff
US6293778B1 (en) * 1997-02-14 2001-09-25 Daniel R. Joseph Automatically balancing a blower in a blown film extrusion line
US7922470B2 (en) * 2000-04-07 2011-04-12 Joseph Daniel R Apparatus for automatic control of cage size in an extruded film production line
DE102013100812B4 (de) * 2013-01-28 2020-03-19 Windmöller & Hölscher Kg Verfahren für einen Materialwechsel bei einer Extrusionsvorrichtung und Extrusionsanlage

Also Published As

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US20240083083A1 (en) 2024-03-14
CN114555326A (zh) 2022-05-27
DE102019215875A1 (de) 2021-04-15
WO2021069475A1 (fr) 2021-04-15

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