EP3206853A1 - Procede et dispositif de fabication et de traitement d'un tube de film - Google Patents

Procede et dispositif de fabication et de traitement d'un tube de film

Info

Publication number
EP3206853A1
EP3206853A1 EP15778687.2A EP15778687A EP3206853A1 EP 3206853 A1 EP3206853 A1 EP 3206853A1 EP 15778687 A EP15778687 A EP 15778687A EP 3206853 A1 EP3206853 A1 EP 3206853A1
Authority
EP
European Patent Office
Prior art keywords
film tube
volume flow
generated
film
thick
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15778687.2A
Other languages
German (de)
English (en)
Inventor
Ingo Putsch
Ali Hassan
Ingo HEHMANN
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 EP3206853A1 publication Critical patent/EP3206853A1/fr
Withdrawn legal-status Critical Current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
    • B29C48/28—Storing of extruded material, e.g. by winding up or stacking
    • 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
    • B29C48/25—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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/16—Straightening or flattening
    • B29C53/20—Straightening or flattening of tubes
    • 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
    • B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B5/00—Packaging individual articles in containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, jars
    • B65B5/06—Packaging groups of articles, the groups being treated as single articles
    • B65B5/061—Filled bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B5/00—Packaging individual articles in containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, jars
    • B65B5/08—Packaging groups of articles, the articles being individually gripped or guided for transfer to the containers or receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/02—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks
    • 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
    • B29C2948/92971—Fluids, e.g. for temperature control or of environment
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets

Definitions

  • the invention relates to a method for producing and further processing a film tube according to the preamble of claim 1 and to an apparatus for producing and further processing a film tube according to the preamble of claim 14.
  • a plastic melt is converted into a cylindrical melt stream in an extrusion die. This is often done in a helical distributor, but mandrel tools are known which can be used for the stated purpose.
  • the melt stream is then withdrawn from an annular die which is associated with, and in particular part of, the extrusion die.
  • This is now cooled. This cooling can be left to the ambient air, but in practice a tempering device is used, with which a tempered volume flow of a fluid on the film tube, preferably on the outer circumference, if necessary, but also or alternatively on the inner circumference, passed.
  • This tempering device is often subdivided into circumferential sections, so that the respective peripheral sections of the film tube can be acted on with different sizes of the volumetric flow ("size” here is the amount of fluid per unit of time) and / or can be acted upon by different temperatures of the volumetric flow
  • size here is the amount of fluid per unit of time
  • temperatures of the volumetric flow
  • Peripheral portion of the film tube with a lower volume flow and / or subjected to a higher temperature so here remains compared to adjacent peripheral portions a lower viscosity of the not yet solidified film tube, so that here the film tube more "dissolves" and thus becomes thinner
  • the film remains - at least initially - in its thickness, yet often - albeit small - irregularities in the thickness of the film tube over its circumference occur, so that they do not respond to subsequent processing steps
  • the film tube is usually flattened as follows: The film tube is usually flattened after it has been produced, which means that two layers of film are brought into
  • Such a film tube is processed for various purposes. Often these are packaging tasks for which the film is needed.
  • the object of the present invention is therefore to propose a method and a device for the production and further processing of a film tube with which material and thus costs can be saved.
  • the object is solved by all features of claim 1.
  • a first volume flow in at least one peripheral section of the temperature control device is different from the volume flow of further peripheral sections, wherein at least one thick spot is generated on the film tube,
  • first volume flow is generated in succession with adjacent peripheral sections, the first volume flow being adapted to the rotation of the flat laying device by the corresponding at least one subframe, so that the at least one thick spot occupies substantially the same position relative to the flattening device.
  • At least one thick spot is produced, which is then produced deliberately, in order then to be able to provide, for example, a higher mechanical strength of the film at the points in question.
  • the film thickness can be reduced in total, which could be provided at the then impressed Dickstelien the original film thickness.
  • thick points here but meant no thicker places that inevitably occur in the production of film as uniform thickness as possible, but intended thick spots that differ from the target thickness or the actual average thickness at least 10%, in particular at least 20%, preferably 30%.
  • the relevant peripheral portion of the film tube is cooled faster than adjacent sections.
  • the respective peripheral portion generates the Temperature control device a larger volume flow and / or a volume flow at a lower temperature compared to surrounding peripheral portions.
  • changed parameters are set.
  • these changed parameters are not permanently linked to a circumferential section of the temperature control device. Rather, it is provided with rotating flattening device that successively set these changed parameters in an adjacent peripheral portion of the temperature control, while at the peripheral portion in which the changed parameters are set to take them back. In this way, the thick spot can move over the circumference of the film tube.
  • the successive loading of the peripheral sections of the temperature control takes place in dependence on the rotational movement of the Flachlegevorraum. It is provided that the thick place occupies substantially the same position relative to the flattening device and does not move relative to this.
  • the thickness of the film can be adjusted via a controller or a controller. In principle, it may be provided to produce the film tube with the smallest possible deviation from a desired thickness or an average thickness. This thickness is then superimposed on a thick spot, so that a desired thickness profile of the film tube is formed over the circumference. The thickness can be measured with a thickness gauge. These measurement data can be supplied to a control and / or regulating device, which then issues control commands to the peripheral sections of the temperature control device. The control and / or regulating device can also be communicated data to the thick places, so that they can generate these by a corresponding control peripheral portions of the temperature control.
  • the control and / or regulating device advantageously also controls the rotational movement of the flattening device or at least receives data on the rotational movement.
  • the thick spot production can then be adjusted.
  • it is provided to guide the film tube after its flattening by a Reversiervorrichtu ng.
  • a reversing device is a device in which deflecting rollers and turning bars are arranged at a distance from the tube axis, their axial extent extending transversely to the tube axis. The pivoting of the deflecting rollers and turning bars around the tube axis makes it possible to pull off the film tube by means of a fixed transport roller pair even when the flat laying device rotates. With such a reversing device it is ensured that the thick places also remain at the intended positions and do not subsequently shift relative to the folding edges.
  • At least two thick places are introduced into the film tube.
  • Such a number offers advantages, since in many applications a symmetrically constructed film is needed. For example, it is conceivable that bags are made from the tube. Then the thick places could be arranged around the folding edges running, so that the weakening of the material resulting from the folding edges could be compensated.
  • side folds are inserted into the film tube.
  • a combination of thick areas and gussets already allows a suitable pre-assembly of the film for various applications in film production.
  • Particularly preferred is the introduction of a thick spot of a position of the film on which an outer edge of a gusset is placed. In this way, even at gusseted tubes in the later Processing to make it possible to preserve highly stressed areas in a targeted manner without making the entire film tube durable and thus material-intensive.
  • a film tube produced with the embodiments described above can be further processed in different ways.
  • the simplest type of further processing is the winding of the film tube. It can be wound up as a hose. Furthermore, the film tube can be cut in the areas of the two side edges. The film webs separated in this way can be further processed independently of each other in a winding device to form a roll. Finally, only one side edge can be cut open and the subsequently unfolded tube can be wound up. Such a film could be used directly by the end user. This often requires films in which the side edges are reinforced, which can be produced very easily with the method according to the invention.
  • the flattened film tube is fed to a device for packaging a plurality of objects stacked one above the other, the film being grasped at holding positions with pulling devices and pulled over the objects.
  • a device for packaging a plurality of objects stacked one above the other the film being grasped at holding positions with pulling devices and pulled over the objects.
  • Such devices are often referred to as stretch hood systems.
  • stacked objects may refer, for example, to a pallet on which a single further object is arranged, such as a household appliance
  • Another example is a stacked arrangement of several, in particular identical, objects
  • the pulling device which comprises a plurality of holding elements, grips the film at certain holding positions and then pulls the film over the objects stacked on top of one another
  • Pulling device may also be able to receive from the holding positions starting parts of the film tube, so that In the described packaging of objects stacked on top of one another, the film is subjected to high stress, in particular at the holding positions, so that the film must be sufficiently thick at these locations. At the other points, the stress and thus also the requirement for the film thickness are lower, so that cost savings can be achieved by the method according to the invention.
  • a device for forming, filling and closing sacks In a further advantageous embodiment of the invention, it is provided to feed the flattened film tube to a device for forming, filling and closing sacks.
  • a device for forming, filling and closing sacks In such a device, an empty bag is first produced from the film tube, wherein an open-top tube piece is produced by transverse welding of the leading end and separating. This is fed to a filling station, so it is filled. In a closing station, the upper end is then also closed.
  • the particularity of such a device is that the length of tubing is held from a time prior to its separation to after closing the top of device components, typically grippers. Again, the gussets are heavily stressed, especially at the points where the transverse weld crosses the outer edges and meets these.
  • the flattened film tube can also be fed to a stretching installation in which it is stretched in the transport direction.
  • the film tube or even a film web produced therefrom is heated and stretched in its transport direction by up to ten times its original length.
  • thick spots at the edges of the film tube or the film web can help to reduce the neck-in that occurs in such a process, as the film is held tighter through the nips by the thick spots.
  • thin areas can also be provided, which can compensate in advance for the thickening occurring simultaneously with the neck-in.
  • An advantageous development of the method according to the invention provides that the respective peripheral portion of the tempering device, with which the first volume flow is generated, deviates by an angle from the angular position which occupies the flattening device during its rotational movement. This is therefore a "lead over" of the winding position of the first volume flow relative to the position at which the thick location is to be arranged relative to the flat laying device If such an overfeed is not provided, a thick spot would be observed at an undesired position in the flattened film tube, but an overfeed does not take place at the inflection points of the flattening device the flattening device is reversely rotated, ie, it rotates back and forth between two angular positions A reversing operation of the flattening device is fundamentally advantageous in the present invention.
  • the lead is advantageously at least 5 °, in particular at least 10 °.
  • the object mentioned at the outset can also be achieved according to the features of claim 14 in that a first volume of flow differs in at least one circumferential section of the temperature control device from the volume flow of further peripheral sections, at least one thin point being produced on the film tube,
  • the film tube can form thinner specifically at angular positions where only a lower strength of the film compared to other angular positions is required.
  • the object is further achieved by a device according to claim 15.
  • Fig. 1 side view of an apparatus for producing a
  • a device 1 for producing a film tube which initially comprises at least one extruder 2 with which, for example, plastic present in granular form can be plasticized. Via a line 3, the plastic melt is thus supplied to an extrusion die 4, where this melt is transferred into a cylindrical melt stream, so that this melt stream from a not visible in this figure annular gap 5 in withdrawal direction z can be pulled out.
  • a not yet solidified film tube 6 This is from the inside by a slight overpressure inflated so that it has a larger diameter within the optional calibration device 7.
  • a solidification of the film tube is carried out by a tempering device 8, which is often referred to as a cooling ring because of its ring-like, the film tube enclosing configuration.
  • the flattening device is rotatably arranged, wherein the axis of rotation is substantially aligned with the tube axis 11, which is indicated in the figure 1 by a dash-dotted line.
  • the rotatability of the flattening device is indicated by the arrow 12.
  • the tempering 8 is divided into different peripheral sections. Each peripheral portion of the temperature control device is able to apply the film tube with an individual volume flow (amount of fluid per unit time) and / or with a volume flow at an individual temperature. As the fluid is preferably provided air.
  • the peripheral portion of the film tube associated with the relevant circumferential section of the tempering device can be individually tempered, in particular cooled.
  • the peripheral portions of the film tube which no longer "deliquesce" as much due to the more cooling action of the tempering device, form a thick point 13, which is indicated in the figure with a double line.
  • FIG. 1 also shows a reversing device 15, which has the task of guiding the flattened film tube from the flat laying device to the stationary roller 16 without causing any damage.
  • the arrow 17 indicates that this film tube is now led to further processing, which is not specified here.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication et de traitement d'un tube de film (6) dans lequel une matière plastique fondue est transférée, au moyen d'un outil d'extrusion (4), à un flux de matière fondue cylindrique, le flux de matière fondue est tiré à travers une fente annulaire (5) associée à l'outil d'extrusion (4) pour former le tube de film (6), au moins un débit volumique pourvu d'au moins un fluide, régulé en température au moyen d'un dispositif de régulation de température (8), est dirigé vers la périphérie extérieure du tube de film (6) ; le dispositif de régulation de température (8) est divisé en parties périphériques ; un débit volumique de tailles différentes et/ou de températures différentes est généré au moyen de chaque partie périphérique de sorte que le tube de film (6) est régulé en température à des températures différentes sur sa périphérie ; et le tube de film (6) est mis à plat avec un dispositif de mise à plat (9) ; le dispositif de mise à plat (9) est mis en rotation par rapport à l'outil d'extrusion (4). Un premier débit volumique dans au moins une partie périphérique du dispositif de régulation de température (8) est différent du débit volumique d'autres parties périphériques ; au moins un emplacement épais (13) est réalisé au niveau du tube de film ; le premier débit volumique est généré avec des parties périphériques adjacentes ; le premier débit est généré, en étant adapté à la rotation du dispositif de mise à plat (9), par l'au moins une des périphériques correspondantes de sorte que l'au moins un emplacement épais (13) occupe pratiquement la même position par rapport au dispositif de mise à plat (9).
EP15778687.2A 2014-10-15 2015-10-13 Procede et dispositif de fabication et de traitement d'un tube de film Withdrawn EP3206853A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220936 2014-10-15
PCT/EP2015/073632 WO2016059025A1 (fr) 2014-10-15 2015-10-13 Procede et dispositif de fabication et de traitement d'un tube de film

Publications (1)

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EP3206853A1 true EP3206853A1 (fr) 2017-08-23

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EP15778687.2A Withdrawn EP3206853A1 (fr) 2014-10-15 2015-10-13 Procede et dispositif de fabication et de traitement d'un tube de film

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US (1) US20170232653A1 (fr)
EP (1) EP3206853A1 (fr)
CN (1) CN107107430A (fr)
WO (1) WO2016059025A1 (fr)

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DE102016012424A1 (de) * 2016-10-18 2018-04-19 Reifenhäuser GmbH & Co. KG Maschinenfabrik Verfahren zum Betreiben einer Blasfolienanlage, Verwendung eines Verfahrens zum Betreiben einer Blasfolienanlage, Blasfolienanlage und Abquetschwalze
CN110065225B (zh) * 2019-05-31 2021-03-16 重庆瑞霆塑胶有限公司 塑料薄膜吹塑设备
CN110065223B (zh) * 2019-05-31 2021-05-28 重庆瑞霆塑胶有限公司 塑料薄膜吹塑方法
CN110065224A (zh) * 2019-05-31 2019-07-30 重庆瑞霆塑胶有限公司 薄壁管挤压装置
CN110181800B (zh) * 2019-06-28 2021-05-28 重庆瑞霆塑胶有限公司 倾斜架调整机构
DE102019215492B4 (de) * 2019-10-09 2025-08-07 Windmöller & Hölscher Kg Blasfolienanlage und Verfahren zur Herstellung von Folienschläuchen oder Folienbahnen
CN111497203B (zh) * 2020-04-30 2021-10-15 福建连众智惠实业有限公司 一种人字夹板自动开合调整机构
CN112793116A (zh) * 2020-12-15 2021-05-14 咸阳新德安新材料科技有限公司 一种大管径柔性复合高压输送管加工设备及工艺

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WO2016059025A1 (fr) 2016-04-21
CN107107430A (zh) 2017-08-29
US20170232653A1 (en) 2017-08-17

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