EP1699702B1 - Vorrichtung zur endwärmebehandlung einer verpackung mit einer thermoplastischen folie - Google Patents

Vorrichtung zur endwärmebehandlung einer verpackung mit einer thermoplastischen folie Download PDF

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Publication number
EP1699702B1
EP1699702B1 EP04820458A EP04820458A EP1699702B1 EP 1699702 B1 EP1699702 B1 EP 1699702B1 EP 04820458 A EP04820458 A EP 04820458A EP 04820458 A EP04820458 A EP 04820458A EP 1699702 B1 EP1699702 B1 EP 1699702B1
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EP
European Patent Office
Prior art keywords
packaging
roller
rollers
conveyer
heat
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EP04820458A
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English (en)
French (fr)
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EP1699702A1 (de
Inventor
Renato Rimondi
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AWAX Progettazione e Ricerca SRL
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AWAX Progettazione e Ricerca SRL
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Priority claimed from ITBO20030759 external-priority patent/ITBO20030759A1/it
Priority claimed from ITBO20040350 external-priority patent/ITBO20040350A1/it
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    • 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
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/162—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by feeding web material to securing means
    • B65B7/167—Securing by heat-shrinking
    • 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
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/20—Applying or generating heat or pressure or combinations thereof by fluid pressure acting directly on folds or on opposed surfaces, e.g. using hot-air jets
    • 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
    • B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
    • B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat

Definitions

  • Fresh food products are often packed to protect them from contact and prolong their life, in tubs or trays closed or wrapped in thermoplastic film.
  • the present-day packaging techniques are fundamentally as follows:
  • Thermoplastic films normally have a heat-shrink property which is prepared at the production stage and/or is the result of pre-stretching treatments at the use stage of these films, and this property can be used to improve the packaging process, i.e. to cause the film to cling very closely to the tray with the product inside.
  • This packaging technique has the drawback that the whole of the package must be exposed to a large amount of heat by immersing it in a fluid at a very high temperature for a considerable period of time. This is necessary in order to raise all of the film around the tray to a high enough temperature to set off the shrinkage process in order to cause the film which would otherwise be loose, to cling to the tray.
  • the consequences of applying such a large amount of heat to a package containing fresh food, which is normally kept in a cold chain that must never be broken, on the preservation of the product, may well be imagined.
  • the applicant is the owner of WO 03/051715 for a process and a machine capable of producing food product packagings by the method described in point a) above, with the film clinging to the tray, mainly by exploiting the stretchability properties of a thermoplastic film rather than its heat-shrink properties. In certain stages of this process it is also indicated that heat can be applied to the film to optimize the formation of the packaging.
  • One specific problem encountered with this process, in the packaging of food products in trays, is how to achieve perfect transparency of the part of the packaging film that covers the top of the tray and through which the packaged product is seen, because the presence of creases or wrinkles, even if only local, on this part of the film would give the consumer the impression that the product was old and had deteriorated.
  • the film has barrier or fluid-impermeability properties and is heated by convection by a stream of hot air, there will inevitably be an increase in the temperature of the atmosphere contained within the film envelope, tending to increase the volume and consequently the internal pressure of the packaging precisely because of this impermeability of the film to fluids.
  • This increase in the internal pressure stretches the packaging film, which deforms much like a balloon being inflated.
  • the atmosphere inside the packaging cools down and the internal pressure is removed, the creases and wrinkles that existed before the heat treatment return, sometimes worse than before.
  • Document US 2 785 519 A discloses an apparatus for the final heat treatment of packagings with thermoplastic film, said packagings presenting at least one top surface, whereby there are provided means for transferring an amount of heat to at least said top surface, by heat conduction, in such a way that a sufficient amount of heat is transferred quickly directly onto the intended surface, to achieve the desired effects, without harmfully modifying the temperature of the atmosphere.
  • reference 1 denotes the belt conveyer which travels in the direction F carrying the packaging 2 with the product 102 inside a tray packed in a thermoplastic stretch film, which may optionally also have a barrier effect or fluid-tightness properties, coming from the packaging machine.
  • the stretch film wrapped around the product may be of the usual type that allows all gases to pass through it, or of the type impermeable to all gases or of the type that allows some gases to pass through it and others not.
  • At least one preferably rolling means such as for example a belt, or preferably a roller 3 of suitable diameter, which may be idle, constructed at least superficially with any material that does not stick to the packaging film and that is heated by any suitable means to a temperature at which, when this roller is rolled over the top surface of the packaging and touches it with slight interference (see below), it transfers to this surface directly, by conduction, the moderate amount of heat necessary to remove any creases or wrinkles from this surface without significantly modifying the temperature of the atmosphere inside the packaging.
  • at least one preferably rolling means such as for example a belt, or preferably a roller 3 of suitable diameter, which may be idle, constructed at least superficially with any material that does not stick to the packaging film and that is heated by any suitable means to a temperature at which, when this roller is rolled over the top surface of the packaging and touches it with slight interference (see below), it transfers to this surface directly, by conduction, the moderate amount of heat necessary to remove any creases or wrinkles from this surface without significantly modifying the temperature of the atmosphere inside the
  • the roller 3 may have its own heat sources, which may be internal to it, or may receive its heat from a stream of hot fluid striking it, produced for example by the apertures B1 and B2 on the sides of the intermediate-final part of the conveyer 1, which dispense hot air at the right temperature onto the perimeter of the packaging 2, also flowing over the roller 3 and transferring to it the heat required for the heat treatment of the top of the packaging 2.
  • the roller 3 must not only be non-stick towards the film of the packaging 2 but also light enough not to induce harmful interference with the said packaging and must have good thermal inertia. Good results have been obtained for example with aluminium rollers covered with silicone rubber or with rollers made of carbon-fibre composite and epoxy matrix, which has the great advantage of reducing their weight.
  • the roller 3 is supported rotatably in bearings or other means with a low coefficient of friction 4, by a spindle 5 attached to the free end of a U-shaped arm 6, which extends from the roller in the direction from which the packaging has arrived and which at the other end is mounted rotatably, via bushes 7 with a low coefficient of friction, on a horizontal shaft 8 parallel to the said roller.
  • the shaft 8 passes through straight vertical slots 10, 110 in brackets 11, 111 attached to the sides of the frame of the conveyer 1, and attached to the insides of these brackets are vertical racks 12, 112 meshing with pinions 13, 113 keyed to the said shaft 8, which last has on at least one end a knob 108 which can be turned to rotate the shaft 8 and modify its distance from the conveyer 1.
  • the shaft 8 is stabilized at the height selected by rotating it in this way by means of the friction exerted against the brackets 11, 111 by pairs of washers 9, 109 which are made of a material suitable for the purpose, are mounted on this shaft 8, and touch the opposite faces of the said brackets.
  • One washer of each pair presses, for example, against the pinions 13, 113, while the other washers can move axially and are pushed towards the said brackets 11, 111 by elastic means such as, for example, diaphragm springs 14, 114 loaded by nuts 15, 115.
  • the height adjustment of the shaft 8, which is necessary in order to position the roller 3 correctly, as the height of the incoming packagings 2 varies, can be effected differently automatically by a remote-controllable electric motor unit, e.g. of stepper motor or equivalent type, conveniently arranged so as not to be affected by the temperatures of the operating station in which it operates and controlled by the processor at the packaging machine which with the aid of means normally present in the said packaging machine knows the dimensions of the various products inserted into the packaging cycle.
  • a remote-controllable electric motor unit e.g. of stepper motor or equivalent type
  • the said height adjustment of the shaft 8 also modifies the height of the roller 3 and its distance from the conveyer 1, as does the possibility of pivoting upwards, by the device which will now be described.
  • a lever 16 formed for example from a metal sheet by cutting and bending.
  • This is provided with a projection 216 bent parallel to the shaft 8, the said projection sliding in a vertical slit 17 in the neighbouring bracket 111 and provided with an extension 316 alongside the arm 6 terminating in a U-shaped head 416, on the lower flange of which the said arm 6 normally rests but is free to pivot upwards through an angle proportional to the height of the said head 416.
  • the roller 3 turns and is suspended from a structure that enables its minimum distance from the conveyer 1 to be adjusted in such a way that the roller can operate in contact with that part of the packaging 2 film which closes the top of the tray with the product inside, without significantly touching the tray itself.
  • the roller 3 rotates because of friction between it and the packaging and spreads onto the said film the heat necessary for neutralizing any creases or wrinkles.
  • Good results have been obtained when packaging with film having a thickness of approximately 40 microns, with the film being treated by the roller 3 at a temperature of between approximately 40° and 80°C, the said packaging being advanced by the conveyer 1 at a speed of between 0.05 and 0.5 m/s.
  • a modified atmosphere is created inside the packaging to prolong the life of the packaged product.
  • This atmosphere is at a slightly higher pressure than the external atmosphere, so the top of the film of the packaging is not perfectly flat but slightly domed, with a slight outward convexity.
  • the roller 3 will therefore on average touch the highest part of this dome of film, without significantly interfering with the tray, as any serious interference between these two parts could result in impact damage to the packaging or could stop the packaging on the conveyer 1, with obvious negative consequences.
  • the entire moving part of the device, including the roller 3 and the arm 6, must be kept as light as possible so that it can be raised with the least possible effort during the interference between the roller and the incoming packaging 2.
  • the objective of lightening the said moving part can be achieved, in combination with or as an alternative to the matters described with reference to limiting the weight of the roller 3, by the additional application of a suitable counterweight (not shown), for example on the crossbar 106 of the arm 6.
  • a suitable counterweight for example on the crossbar 106 of the arm 6.
  • a small damper (not shown), which could be placed on the lower flange of the head 416 of the lever 16.
  • the arm 6 may support one after the other, two or more mutually parallel rollers 3, as illustrated in dashes in Figure 1, in such a way as to create a rotating grid which limits the direct exposure of the top of the packaging to the external environment and is therefore better able to treat this part essentially by heat conduction.
  • the pivoting arm 6 may advantageously be replaced by a parallel-motion mechanism and the array of rollers 3 will be supported by that side of the parallelogram which is opposite the fixed side, so that the said array of rollers can pivot while always remaining parallel to the conveyer 1 beneath it.
  • the roller or rollers 3 may be driven in some suitable way rather than being idle.
  • reference numeral 1 indicates the belt conveyer which travels in the direction of arrow F and onto which there rests the packaging F with the product arranged at the interior of a tray and tightly wrapped by a thermoplastic film which is stretchable and can be also of the barrier effect or fluid tight.
  • the stretchable film which wraps the product can be of the common type which permits the passage or all gases or of a type impermeable to all gases or of the type which permits the passage of some gases and not of other gases.
  • top portion of the packaging 2 is thermally treated by a set of rollers 3 of suitable diameters, for example freely rotatable, constructed at least superficially with any material that does not stick to the packaging film and that is heated by any suitable means to a temperature at which, when this roller is rolled over the top surface of the packaging and touches it with slight interference (see below), it transfers to this surface directly, by conduction, the moderate amount of heat necessary to remove any creases or wrinkles from this surface without significantly modifying the temperature of the atmosphere inside the packaging.
  • suitable diameters for example freely rotatable
  • the rollers 3 may have their own heat sources, which may be internal, or may receive the heat from a stream of hot fluid striking it, produced for example by the apertures B1 and B2 on the sides of the intermediate-final part of the conveyer 1, which dispense hot air at the correct temperature onto the perimeter of the packaging 2, also flowing over the rollers 3 and transferring to them the heat required for the heat treatment of the top of the packaging 2.
  • the rollers 3 and the conveyer 1 are preferably insulated from the outer environment by a removable hood 18 preferably of suitable transparent plastic material, open at both ends, which has the function of maintaining the heat produced by the apertures B1 and B2 suitably concentrated onto the travelling packages and onto the rollers 3.
  • the rollers 3 are mounted rotatable the one following the other, co-planarly and at a short distance the one from the other onto the horizontal portion of side members 19, 119, for example having the shape of a rectangular triangle or of a square and they are hinged at 20 and 120 to parallel link rods 21, 121, of which the upper ones 21 are rotatably mounted by their other end to a rod 22 parallel to the hinge points 20, 120 and secured by its end to supports 23, 123 which on their turn a secured to the side members of the frame of the conveyer 1, while the lower link rods 121 are secured by their other end, for example by means of a stop dowel 24 to a shaft 25 parallel to the said rod 22, which by its ends is rotatably supported by the supporting members 23,123.
  • the link rods 121 carry on their end keyed to the shaft 25, appendices 221 directed upwards and provided with circular sector slots, having their axes of curvature on the axis of shaft 25 and traversed by the rod.
  • one of the link rods 121 carries an appendix 321 directed downwardly, linked to a fork 27 secured to the stem of a linear actuator 28, for example to a simple-action cylinder and piston group, the body of which is secured by a bracket 29 to the near support 23.
  • the slots 26 and the fork 27 which constitute the articulation of the appendix 321, add to the system a correct degree of freedom in the vertical displacement of the unit of rollers, which in this manner can bear by gravity onto the packaging to be treated and adapt itself to possible irregularities thereof.
  • a photocell 30 which is acted upon by the passage of the packaging 2.
  • the photocell 30 is connected to a processor 31 which is connected to the motor 32 which controls the conveyer 1, and to the same processor there is connected also the electro-valve 33 which controls the cylinder 28. ln correct time relationship therefore the processor will control the operation of the valve 33, by properly causing the lifting and lowering of the unit of roller 3, upon the passage of any packaging to be treated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Basic Packing Technique (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Claims (22)

  1. Vorrichtung zur Endwärmebehandlung von Verpackungen mit thermoplastischer Folie, wobei die Verpackungen zumindest eine Oberseite aufweisen, mit:
    - Mitteln zum Übertragen einer Wärmemenge an die zumindest eine Oberseite durch Wärmeleitung in einer solchen Weise, dass die Wärme schnell direkt auf die gewünschte Oberseite übertragen wird, um die gewünschten Wirkungen zu erzielen, ohne die Temperatur der Atmosphäre im Inneren der Verpackung nachteilig zu modifizieren; wobei die Mittel oberhalb des Förderers (1) angeordnet sind, der die fertige Verpackung (2) aufnimmt, wenn diese den Verarbeitungszyklus verlässt und sie zum Ausstoß wegbefördert, und wobei die Mittel so ausgestaltet sind, dass sie auf die Folie mit rollender Beaufschlagung einwirken;
    - wobei die wärmeübertragenden Mittel wenigstens eine Rolle (3) aufweisen, die sich in Kontakt mit der oberen Folie der Verpackung (2) dreht und deren Achse parallel zu den Achsen der Rollen des Förderers (1) verläuft, auf dem sich die Verpackung bewegt;
    - wobei ferner Mittel vorgesehen sind, um die Höhe der Rolle (3) einzustellen, wenn sich die Höhe der Verpackungen (2) verändert, derart, dass die Rolle die obere Folie der Verpackung im Wesentlichen berührt, ohne nennenswert auf die Schale zu drücken, die das verpackte Erzeugnis aufnimmt;
    dadurch gekennzeichnet, dass die Rolle (3) drehbar an einem Ausleger (6) angeordnet ist, der um eine Achse (8) schwenkbar ist, die an den Mitteln zur Höheneinstellung angeordnet ist, die eine Einrichtung (16) aufweisen, an welcher der Ausleger aufliegt und die die Auslenkung beim Verschwenken des Auslegers nach oben begrenzt, wobei die gesamte schwenkbare Anordnung unter Einschluss der physikalischen Merkmale ihrer Baukomponenten so ausgestaltet ist, dass sie mit sehr geringem Aufwand angehoben wird, wenn die Rolle die obere Folie der Verpackung bei der Wärmebehandlung beaufschlagt.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel, die die Wärme an die obere Folie der Verpackung durch Wärmeleitung übermitteln, eine eigene Heizvorrichtung aufweisen, beispielsweise eine elektrische Widerstandsheizung.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel, die der oberen Folie der Verpackung die Wärme durch Wärmeleitung übermitteln, durch einen sie beaufschlagenden Heißluftstrom erwärmt werden, beispielsweise durch eine Strömung warmer Luft, die durch Öffnungen (B1, B2) an den Seiten des Förderers (1), der die Verpackung (2) fördert, ausgestoßen wird, wobei diese Öffnungen auf den Rand der von der Schale geschützten Verpackung gerichtet sind.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Rolle (3) freilaufend ist.
  5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Rolle (3) mit Mitteln gekoppelt ist, die sie mit einer Umfangsgeschwindigkeit rotieren lassen, die gleich oder geringfügig verschieden von der linearen Transportgeschwindigkeit des Förderers (1) ist, auf dem sich die Verpackung (2) fortbewegt, und in einer Richtung, die der Transportrichtung der Verpackung entspricht.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Rolle (3) eine ausreichend große thermische Trägheit aufweist.
  7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Rolle (3) aus einem Material besteht oder zumindest damit beschichtet ist, das nicht an der einer Wärmebehandlung unterzogenen Verpackungsfolie anhaftet.
  8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Rolle (3) aus Aluminium gefertigt und mit Silikongummi beschichtet ist.
  9. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Rolle (3) aus einem Karbonfaser-Verbundmaterial in Epoxidmatrix besteht.
  10. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass Ausgleichsmittel wie beispielsweise Gegengewichte an dem die Rolle (3) tragenden Schwenkausleger (6) vorgesehen sind, um die Kraft zu begrenzen, die erforderlich ist, um die Rolle anzuheben, während sie auf die obere Folie der Verpackung drückt, die der Wärmebehandlung unterzogen wird.
  11. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Schwenkachse (8) des die Wärmebehandlungsrolle (3) tragenden Auslegers (6) durch gerade, vertikale Schlitze (10, 110) in Flanschen (11, 111) hindurchgeht, die an den Seiten des Rahmens des Förderers (1) angebracht sind, auf dem sich die Verpackung (2) bewegt, wobei an den Innenseiten dieser Flansche beispielsweise vertikale Zahnstangen (12, 112) angeordnet sind, die mit Zahnrädern (13, 113) kämmen, die an der Achse (8) festgelegt sind, wobei die Achse wenigstens an ihrem einen Ende einen Knauf (108) aufweist, der gedreht werden kann, um die Achse zu drehen und ihren Abstand von dem darunterliegenden Förderer (1) zu verändern und sie dauernd horizontal ausgerichtet zu halten, wobei die Achse (8) in der durch die beschriebene Drehung gewählten Höhe dadurch stabilisiert wird, dass auf die Flansche (11, 111) mit Hilfe von Scheibenpaaren (9, 109) aus für diesen Zweck geeignetem Material Reibung ausgeübt wird, wobei die Scheiben an der Achse (8) angeordnet sind und die einander gegenüberliegenden Seiten der Flansche berühren und eine Scheibe eines jeden Scheibenpaars beispielsweise gegen das jeweilige Zahnrad (13, 113) drückt, während die anderen Scheiben axial beweglich sind und durch elastische Mittel (14, 114), die durch Muttern (15, 115) vorgespannt sind, gegen die Flansche (11, 111) gedrückt werden.
  12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass an der Schwenkachse (8) des die Andruckrolle (3) tragenden Auslegers (6) an der Seite des Auslegers ein Hebel (16) über ein Zwischenstück (116) drehbar angeordnet ist, der mit einem parallel zu der Achse (8) gebogenen Vorsprung (216) versehen ist, wobei der Vorsprung in einem Vertikalschlitz (17) im benachbarten Flansch (111) gleitet und wobei der Hebel mit einer Verlängerung (316) entlang des Auslegers (6) versehen ist, die an ihrem Ende eine U-förmige Klaue (416) aufweist, auf deren unteren Schenkel der Ausleger (6) normalerweise aufliegt, jedoch frei nach oben um einen ausreichend großen Winkel schwenken kann, der durch die Öffnungsweite der Klaue (416) bestimmt wird.
  13. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass bei einer Variante der Konstruktion die Höheneinstellung der Schwenkachse (8) des die Wärmebehandlungsrolle (3) tragenden Auslegers (6) automatisch bewirkt werden kann mittels einer fernsteuerbaren Elektromotoreinheit, z. B. eines Schrittmotors oder dgl., die vom Prozessor der Verpackungsmaschine gesteuert bzw. geregelt wird, die mit üblicherweise in der Verpackungsmaschine vorhandenen Mitteln die Abmessungen der verschiedenen, in den Verpackungszyklus eingeführten Produkte kennt.
  14. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass zur Vergrößerung der oberen Kontaktfläche auf der Verpackungsfolie die Wärmebehandlung dieser Fläche durch zwei oder mehr Rollen (3) bewirkt wird, die hintereinander und parallel zueinander derart angeordnet sind, dass sie eine Rollenanordnung bilden, mit der ein Kontakt durch Konvektion an der Oberseite der Verpackung mit der äußeren Umgebung begrenzt wird und die deshalb diesen Bereich im Wesentlichen durch Wärmeleitung wärmebehandelt.
  15. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass die Wärmebehandlungs-Rolleneinheit (3) an der Seite eines Parallelogramm-Auslegers angeschlossen ist, die sich gegenüber dessen fixierter Seite befindet, so dass die Rollenanordnung schwenken kann, während sie immer parallel zum darunterliegenden Förderer (1) bleibt.
  16. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass Mittel vorgesehen sind, die bewirken, dass beispielsweise bei einer Verpackung (2) mit einer Dehnfolie mit Sperreffekt und einer Dicke von etwa 40 µm die Temperatur bei der die Folie durch die Rolle oder die Rollen (3) erwärmt wird, proportional zwischen etwa 40° und 80° Celsius beträgt, während der Förderer (1) darunter die Verpackung (2) mit einer Geschwindigkeit zwischen 0,05 und 0,5 m/s bewegt.
  17. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die zumindest eine Rolle (3) an einer Auf- und Ab-Vorrichtung angeordnet ist, die sie parallel zu dem Förderer, auf dem die zu behandelnde Verpackung gefördert wird, hält und die sie geregelt bzw. gesteuert unter Wirkung eines Betätigungsorgans anheben oder absenken kann, das zu Beginn eines jeden Arbeitszyklus die Rolle in eine höchste, vorbestimmte Position, die mit der Maximalhöhe der zu behandelnden Verpackungen korreliert, anhebt, so dass es in dieser Stellung zu keiner Interferenz zwischen den Verpackungen und den angehobenen Rollen kommt, wobei weiter Mittel vorgesehen sind, die bewirken, dass immer dann, wenn eine Verpackung unter die Rolle gelangt, diese in korrektem Phasenverhältnis abgesenkt wird, bis sie die Verpackung mit ausreichend Druck und mit ausreichend Spiel in Vertikalrichtung berührt, und dass Mittel vorgesehen sind, die bewirken, dass am Ende der Behandlung der Verpackung, bevor diese die Wärmebehandlungsrollen vollständig hinter sich lässt, die Rollen mittels der Betätigungseinrichtung (28) in ihre höchste Position zum Start eines Zyklus angehoben werden.
  18. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, dass die Rollen in einer Reihe, aufeinanderfolgend, koplanar und parallel sowohl zueinander als auch relativ zum Förderer (1), auf dem sich die zu bearbeitenden Verpackungen bewegen, angeordnet sind, wobei die Rollenreihe oder -batterie (3) an einer angelenkten Parallelogrammanordnung befestigt ist, die mittels einer Betätigungseinrichtung (28) angehoben oder abgesenkt werden kann mit zutreffender Spielfreiheit in Vertikalrichtung, derart, dass in ihrer unteren Lage die Rollen aufgrund ihrer Gewichtskraft die vorbeigehende Verpackung beaufschlagen.
  19. Vorrichtung nach Anspruch 18, dadurch gekennzeichnet, dass die Rollen (3) drehbar am Horizontalteil von Seitenelementen (19, 119) angeordnet sind, die beispielsweise die Form eines rechtwinkligen Dreiecks oder eines Rechtecks aufweisen und die gelenkig an parallelen Lenkern (21, 121) angeschlossen sind, von denen die oberen (21) an ihren anderen Enden drehbar an einer Stange (22) gelagert sind, die parallel zu den Anlenkpunkten (20, 120) verläuft und die an ihren Enden an Flanschen (23, 123) gesichert ist, die wiederum an den Seitenteilen des Rahmens des Förderers (1) befestigt sind, während die unteren Lenker (121) an ihren anderen Enden beispielsweise mittels eines Haltezapfens (24) an einer Achse (25) angeschlossen sind, die parallel zu der Stange (22) verläuft, die an ihren Enden in den Lagerflanschen (23, 123) drehbar gelagert ist, wobei die Verbindungslenker (121) an ihren Enden, mit denen sie an die Achse (25) angeschlossen sind, nach oben gerichtete Fortsätze (221) versehen sind, in denen kreissegmentförmige Schlitze vorgesehen sind, deren Krümmungsachse mit der Achse (25) zusammenfallen und die von der Stange (22) durchsetzt sind, wobei im Bereich der Fortsätze (221) einer der Verbindungslenker (121) einen nach unten gerichteten Hebel (321) aufweist, der an einen am Betätigungsorgan eines Linearbetätigungsgliedes (28) angeordneten Gabelkopf (27) angelenkt ist, wobei das Linearbetätigungsglied beispielsweise eine einfache Kolben-Zylinder-Einheit ist, deren Zylinderkörper mittels einer Schelle (29) am nahegelegen Flansch (23) festgelegt ist.
  20. Vorrichtung nach Anspruch 19, dadurch gekennzeichnet, dass die Kolben-ZylinderEinheit (28) an ihrem Körper und mittels einer Klammer (29) an dem nächstgelegenen Flansch (23) befestigt ist und an ihrer Betätigungsstange einen Gabelkopf (27) trägt, der mit dem Hebel (321) der gelenkig gelagerten Parallelogrammanordnung zusammenwirkt, die die Rollengruppe (3) trägt.
  21. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, dass zur korrekten Betätigung des Zylinders (28) in Durchlaufrichtung vor der Rolleneinheit (3) seitlich vom Förderer (1) eine Fotozelle (30) angeordnet ist, die bei Vorbeigang der Verpackung (2) beaufschlagt wird, wobei die Fotozelle (30) an einen Prozessor (31) angeschlossen ist, der an den Motor (32) angebunden ist, der den Förderer (1) steuert bzw. regelt, wobei an demselben Prozessor auch das Elektroventil (33) zur Kontrolle des Zylinders (28) angeschlossen ist, so dass der Prozessor in korrektem zeitlichen Ablauf die Betätigung des Ventils (33) steuert bzw. regelt und das Anheben und Absenken der Rolleneinheit (3) bei Durchgang einer jeden zu bearbeitenden Verpackung korrekt bewirkt.
  22. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, dass die Wärmebehandlungsrollen (3) eigene Heizmittel aufweisen, beispielsweise elektrische Widerstandheizungen, oder von einem sie beaufschlagenden Heißluftstrom erwärmt werden, beispielsweise dem Strom heißer Luft, die durch Öffnungen (B1, B2) an den Seiten des die Verpackung (2) fördernden Förderers (1) ausgestoßen wird, wobei diese Öffnungen gegen den Rand der von der Schale geschützten Verpackung gerichtet sind, wobei die Rollen (3) und der Förderer (1) vorzugsweise gegenüber der äußeren Umgebung mittels einer entfernbaren Haube (18) aus geeignetem, transparenten Kunststoffmaterial isoliert sind, die an beiden Enden offen ist, womit erreicht wird, dass die von den Öffnungen (B1, B2) erzeugte Wärme in angemessener Weise auf die geförderten Verpackungen und die Rollen konzentriert wird.
EP04820458A 2003-12-18 2004-12-02 Vorrichtung zur endwärmebehandlung einer verpackung mit einer thermoplastischen folie Not-in-force EP1699702B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITBO20030759 ITBO20030759A1 (it) 2003-12-18 2003-12-18 Metodo ed apparato per il trattamento termico finale di una confezione
ITBO20040350 ITBO20040350A1 (it) 2004-06-01 2004-06-01 Apparato per il trattamento termico finale di una confezione con film termoplastico, particolarmente con film estensibile ed eventualmente anche ad effetto barriera, per migliorare l'aspetto esteriore della stessa confezione
PCT/EP2004/053232 WO2005058705A1 (en) 2003-12-18 2004-12-02 Apparatus for the final heat treatment of a packaging with a thermoplastic film

Publications (2)

Publication Number Publication Date
EP1699702A1 EP1699702A1 (de) 2006-09-13
EP1699702B1 true EP1699702B1 (de) 2007-08-29

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EP04820458A Not-in-force EP1699702B1 (de) 2003-12-18 2004-12-02 Vorrichtung zur endwärmebehandlung einer verpackung mit einer thermoplastischen folie

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EP (1) EP1699702B1 (de)
AT (1) ATE371587T1 (de)
DE (1) DE602004008671T2 (de)
ES (1) ES2291985T3 (de)
WO (1) WO2005058705A1 (de)

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DE602004008671D1 (de) 2007-10-11
ATE371587T1 (de) 2007-09-15
EP1699702A1 (de) 2006-09-13
WO2005058705A1 (en) 2005-06-30
ES2291985T3 (es) 2008-03-01
DE602004008671T2 (de) 2008-07-17

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