EP4045270A1 - Extrudeuse de film soufflé et méthode de production d'une bande de film - Google Patents

Extrudeuse de film soufflé et méthode de production d'une bande de film

Info

Publication number
EP4045270A1
EP4045270A1 EP20792566.0A EP20792566A EP4045270A1 EP 4045270 A1 EP4045270 A1 EP 4045270A1 EP 20792566 A EP20792566 A EP 20792566A EP 4045270 A1 EP4045270 A1 EP 4045270A1
Authority
EP
European Patent Office
Prior art keywords
film
stretching
film web
web
bubble
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
EP20792566.0A
Other languages
German (de)
English (en)
Inventor
Martin Backmann
Markus Bussmann
Gerhard Middelberg
Till Bergmann
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 EP4045270A1 publication Critical patent/EP4045270A1/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
    • B29C48/88—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
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C48/9125—Cooling of hollow articles of tubular films internally
    • 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
    • B29C55/02—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
    • 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
    • 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
    • B29C48/25—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 blown film line for producing a film web according to claim 1 and a method for producing a film web according to claim 2.
  • the object of the present invention is to develop a blown film system with liquid cooling and a corresponding method in such a way that films with numerous other properties can be produced or their properties can be changed over a wide range of variance.
  • the object is achieved by a blown film plant for producing a film web according to claim 1.
  • a blown film line according to the invention is at least equipped with:
  • a blown film that has been cooled with a liquid cooling device is, as already described, more amorphous and can therefore be stretched better than films that can be produced in a blown film plant with air cooling.
  • this achieves important advantages. Because of the better stretchability, more uniform film properties can be achieved. Furthermore, higher degrees of stretching are possible, ie the film can be stretched significantly longer than the original length than films from a blown film line with air cooling. Larger degrees of stretching lead, among other things, to a better flatness of the film. Furthermore, by stretching such films, more rigid films can be obtained.
  • the rigidity of foils is particularly important for various subsequent processing of the foil.
  • these layers are hard and stiff and can also be stretched better with a blown film line according to the invention than a blown film line with air cooling.
  • This enables a barrier layer to have a higher barrier effect.
  • an ethylene-vinyl alcohol copolymer (EVOFI) becomes crystalline during stretching and therefore has a higher barrier effect, based on the layer thickness, than similar films made with air cooling.
  • a liquid cooling device can enclose the film bubble and comprise a liquid reservoir which holds a liquid between the inner wall of the liquid cooling device and the outer circumference of the Foil bubble conducts.
  • a liquid cooling device arranged within the film bubble can be provided.
  • water can be provided as the liquid for cooling the film bubble because of its ease of handling and availability.
  • the blow head is arranged above the liquid cooling device in relation to the direction of gravity.
  • the film bubble can thus be transported in the direction of gravity, so that the liquid does not have to be conveyed in a certain direction, but can also flow downwards.
  • the flattening device is preferably attached in the direction of gravity.
  • a squeezing device is connected in the transport direction of the film to the flattening device, which presses the layers of the double-layer film web strongly against one another so that a gas that is located within the film bubble does not remain between the layers of the double-layer film tube and in particular to inadequacies leads in the stretching process. Furthermore, provision can be made for a reversing device to follow in the transport direction of the film of the lay-flat device and in particular of the squeezing device Later laps run back and forth, so that a lap that is as ideal as possible is created.
  • the hose opening and turning device is provided. This is arranged downstream of the lay-flat device in the transport direction of the film web and upstream of the stretching device.
  • This tube opening and folding device initially comprises a separating device with which a longitudinal edge with which the two layers of the film web can be separated so that the two layers are only connected to one another via the second longitudinal edge. After the separation, one of the layers is turned over around the second longitudinal edge by means of guide devices, so that from The double-layer film web creates a single-layer film web which, however, now in particular has twice the width. This film web can then be stretched in the stretching device. In this way, the loss of material through the neck-in can be reduced.
  • the absolute value of the neck-in depends only on the stretch ratio and not on the width. This means that, based on the total width of the film web, the proportion of the neck-in is reduced, so that the total amount of waste can be reduced by half. In a blown film system with liquid cooling, this procedure leads to better film quality, since with an amorphous film the two longitudinal edges are more stable and, for example, do not tend to tear during folding over.
  • the liquid can be tempered differently over the circumference of the blown film.
  • the blown film can thus be temperature-controlled differently over its circumference. Areas that are cooled faster compared to the average cooling rate are solidified faster and hardly change their thickness. Areas that are cooled more slowly, however, can continue to "flow" so that the local thickness is reduced in these areas.
  • the thickness profile of the blown film can thus be influenced in a simple manner.
  • the film thickness can be reduced at points at which the thickening associated with the neck-in later occurs in order to achieve the desired film thickness after the thickening. This again helps to reduce the amount of waste, as the subsequent trim can be reduced.
  • film temperature control devices are also provided in the transport direction before or after the liquid cooling device.
  • infrared radiators can be provided here, which can irradiate the film, in particular at its later longitudinal edges, so that the film becomes thinner here.
  • An additional application of tempered water or tempered air, in particular in the area of the later longitudinal edges of the foils, can produce the effect described above.
  • the stretching device can follow the reversing device in the transport direction of the film web and be arranged upstream of a winding device. In this case, the stretching device is stationary and can therefore be supplied with energy and cooling liquids in a simple manner.
  • the stretching device can directly adjoin the flattening device.
  • the film then only reaches a reversing device provided.
  • the still warm film can be stretched more easily, but the stretching device must also be mounted in a reversing manner.
  • a cutting or puncturing device which can be arranged upstream of the stretching device, is provided, with which the film can be cut or punctured, in particular in the area near the longitudinal edges.
  • a cutting or puncturing device which can be arranged upstream of the stretching device, is provided, with which the film can be cut or punctured, in particular in the area near the longitudinal edges.
  • any gas that may still be trapped between the layers of the double-layer film web can escape, which leads to an improved result of the stretching process.
  • at least one profile measuring device is provided with which a thickness profile of the film web can be created at least partially over its transverse extent.
  • Such a profile measuring device can be provided upstream and / or downstream of the stretching device.
  • the double-layer film web has been stretched in the stretching device and it is later divided into two individual layers in order to wind them up separately, it is advantageous to provide at least one further profile measuring device with which a thickness profile of at least one of the individual layers can be measured.
  • the at least one profile measuring device is connected to an evaluation and control device, which in turn controls the temperature control devices of the liquid cooling device and / or the film temperature control devices so that a profile control loop is generated.
  • the liquid cooling device has a cross-section deviating from a circular shape.
  • the cross section can be elliptical.
  • FIG. 1 Schematic side view of a blown film line according to the invention
  • FIG. 2 representation of a stretching device
  • FIG. 1 shows a device 1 for positioning a film web.
  • a film bubble 2 is extruded through an annular nozzle gap of the blow head 3 in the direction z, in particular in the downward direction of gravity.
  • a gas which has a pressure that is higher than the ambient pressure, is generally fed into the interior of the film tube 2 through a feed line (not shown). For this reason, the film tube initially expands further during its transport in the direction z. Due to the gas content of the film tube, this is referred to as a film bubble.
  • the expansion only comes to an end when the film tube enters a liquid cooling device 4, which is an essential part of the device 1.
  • the radial expansion possibility of the film tube is limited by the inner wall 5.
  • the film tube often solidifies Entry into the device to form a crystalline or partially crystalline composite. This is done by cooling below the melting point of the material of the film tube.
  • the circumferential line which is defined by the points of transition from melted to solid, is referred to as frost line 6.
  • the liquid cooling device 4 comprises a liquid reservoir 7, the liquid being able to reach the area between the inner wall 5 and the outer circumference of the film bubble 2 along the arrow 8 in order to cool the film bubble.
  • the film bubble 2 After passing through the liquid cooling device 4, the film bubble 2 arrives in the active 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
  • the flattening device is indicated by the arrow 12.
  • the ring 4 is divided into different circumferential sections.
  • Each circumferential section of the liquid cooling device 4 can be able to act on the film bubble with a volume flow (amount of liquid per unit of time) that differs over the circumference of the film bubble and / or with a liquid flow with a temperature that varies over the circumference of the film tube.
  • Water is preferably provided as the liquid.
  • the film tube 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 liquid cooling device, “flow away” to a great extent, form a thin point 13. With a larger one On the other hand, the cooling effect reduces the flow, 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 always arrives at a fixed position of the lay-flat device, it is also necessary in connection with a stretching device that the thin point moves along the circumference, which is indicated in the figure by the arrow 14.
  • This “wandering” of the thin point is realized by changing the parameters of the circumferential section of the ring closest in the direction of arrow 14 in order to now generate a thin point adjacent to the circumferential section of the film tube which just has a thin point.
  • the current thin point is moved back in that the relevant circumferential section of the ring now again has a stronger cooling effect on the angular section assigned to it.
  • a thickness measuring device 18 (also often referred to as a profile measuring device) can be provided which, viewed in the transport direction z, is preferably arranged between the liquid cooling device 4 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 liquid cooling device 4 can be controlled so that a desired thickness profile can be generated.
  • This thickness profile or this The necessary control parameters can be generated dynamically for the individual segments of the liquid cooling device 4, 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 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
  • evaluation and / or control device 40 also take into account the thickness profiles that are associated with the
  • Thickness measuring device 38 and with at least one of the thickness measuring devices 45 have been recorded.
  • the influencing factors of these individual thickness measuring devices can be weighted and taken into account when modifying the control commands.
  • Thickness profiles are primarily taken into account to influence the offset. It can be advantageous that the 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. So the values for a
  • liquid cooling device 4 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 bubble, that is to say the double-layer film web, 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 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 means that the double-layer film 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 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 (in particular if the stretching device follows a film extrusion system inline). 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 sizing 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.
  • 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.
  • the film web 24 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 the 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 becomes.
  • a winding device in which the film web is wound up as a double-layer film web or separately in two individual layers becomes.
  • 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.
  • 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.
  • 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 become a further position at which a further measurement can be carried out.
  • the measuring head it is not necessary that the measuring head has to be stopped to measure the thickness. Rather, it can basically be provided that the measuring head carries out measurements at adjustable time intervals, but the speed of movement is variable. For example, in connection with the present invention it can be fundamentally desirable for the measuring head to be moved more slowly at the edges of the film web in order to increase the density of the measurements here, which increases the accuracy of the thickness profile at the edges. In addition, it can in principle be conceivable that the
  • 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 in particular in the form of cutting knives, 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.
  • 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, are distributed in the axial direction of the roll, so that overall a uniform circumference of the roll is created.
  • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

L'invention concerne une extrudeuse de film soufflé (1) pour produire une bande de film (24, 34), comprenant : au moins une extrudeuse pour fournir une matière plastique sous la forme d'une matière fondue ; une filière de film soufflé (3) ayant une fente de filière circonférentielle, au moyen de laquelle la matière plastique sous la forme d'une matière fondue peut être convertie en une bulle de film (2) sortant de la fente de filière ; au moins un dispositif de refroidissement de liquide (4) pour refroidir la bulle de film (2), un liquide pouvant être appliqué à la circonférence externe et/ou à la circonférence interne de la bulle de film (2) au moyen du dispositif de refroidissement de liquide (4) ; un dispositif d'aplatissement (9) au moyen duquel la bulle de film (2) peut être formée sur une bande de film à deux couches (24, 34), les deux couches se touchant au moins partiellement, et en particulier complètement, sur leurs surfaces ; et au moins un dispositif d'étirage (30) pour étirer la bande de film (24, 34) dans la direction longitudinale.
EP20792566.0A 2019-10-14 2020-10-09 Extrudeuse de film soufflé et méthode de production d'une bande de film Pending EP4045270A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019215782.3A DE102019215782A1 (de) 2019-10-14 2019-10-14 Blasfolienanlage und Verfahren zur Herstellung einer Folienbahn
PCT/EP2020/078375 WO2021074021A1 (fr) 2019-10-14 2020-10-09 Extrudeuse de film soufflé et méthode de production d'une bande de film

Publications (1)

Publication Number Publication Date
EP4045270A1 true EP4045270A1 (fr) 2022-08-24

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EP20792566.0A Pending EP4045270A1 (fr) 2019-10-14 2020-10-09 Extrudeuse de film soufflé et méthode de production d'une bande de film

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US (1) US20220388219A1 (fr)
EP (1) EP4045270A1 (fr)
DE (1) DE102019215782A1 (fr)
WO (1) WO2021074021A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114603841A (zh) * 2022-03-25 2022-06-10 安庆市康明纳包装有限公司 一种薄膜生产工艺

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433937A (en) * 1945-10-25 1948-01-06 Modern Plastic Machinery Corp Machine for making sheets of extruded plastics
FR1237734A (fr) * 1958-06-02 1960-08-05 Dow Chemical Co Fabrication de pellicules tubulaires thermoplastiques
US3207823A (en) * 1959-02-27 1965-09-21 Metal Box Co Ltd Production of flattened tubular plastic film
GB903661A (en) * 1960-03-31 1962-08-15 Ici Ltd Improvements in or relating to the production of films
IL29315A (en) * 1967-02-10 1971-10-20 Bemberg Ag Production of cylindrical sheets
US3822333A (en) * 1969-04-02 1974-07-02 Chisso Corp Process for producing shaped articles of crystalline polyolefins having a roughened surface
US3655846A (en) * 1969-04-28 1972-04-11 Kohjin Co Method and apparatus for making tubular film
US3622657A (en) * 1969-09-24 1971-11-23 Exxon Research Engineering Co Method for forming and cooling thermoplastic film
DK144183A (da) * 1982-04-02 1983-10-03 Fbk International Corp Fremgangsmaade og apparat til koeling og afgysning af en extruderet folie af plastmateriale
US6562165B1 (en) * 2000-08-15 2003-05-13 S.C. Johnson Home Storage, Inc. Method for laminating closure member to film web
US10336535B2 (en) * 2015-03-12 2019-07-02 Poly-America, L.P. Polymeric bags and method of forming polymeric bags
US10974434B2 (en) * 2015-06-08 2021-04-13 Windmöller & Hölscher Kg Device and method for cooling a blown film
US10946575B2 (en) * 2015-06-08 2021-03-16 Windmöller & Hölscher Kg Device and method for calibrating a blown film

Also Published As

Publication number Publication date
US20220388219A1 (en) 2022-12-08
DE102019215782A1 (de) 2021-04-15
WO2021074021A1 (fr) 2021-04-22

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