EP1419966B1 - Verfahren und Vorrichtung zum Umhüllen einer palettisierten Ladung mit einer Stretchfolienhaube - Google Patents

Verfahren und Vorrichtung zum Umhüllen einer palettisierten Ladung mit einer Stretchfolienhaube Download PDF

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Publication number
EP1419966B1
EP1419966B1 EP20030354082 EP03354082A EP1419966B1 EP 1419966 B1 EP1419966 B1 EP 1419966B1 EP 20030354082 EP20030354082 EP 20030354082 EP 03354082 A EP03354082 A EP 03354082A EP 1419966 B1 EP1419966 B1 EP 1419966B1
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EP
European Patent Office
Prior art keywords
finger
load
cover
fingers
stretching
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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.)
Expired - Lifetime
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EP20030354082
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English (en)
French (fr)
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EP1419966A1 (de
Inventor
Jean-Paul Charles Martin Cocher
Georges Jaconelli
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Thimon SAS
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Thimon SAS
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Publication date
Application filed by Thimon SAS filed Critical Thimon SAS
Publication of EP1419966A1 publication Critical patent/EP1419966A1/de
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Publication of EP1419966B1 publication Critical patent/EP1419966B1/de
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Classifications

    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/13—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state
    • B65B9/135—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state for palletised loads

Definitions

  • a stretchable film sheath is well known for providing stability and sealing of a palletized load.
  • the installation of a stretchable sheath does not require a source of heat, because it suffices to mechanically stretch the material of the plastic film beforehand in the horizontal transverse direction before enveloping the palletised load to be wrapped. .
  • the sheath may be of polyethylene, or any other plastic stretchable material.
  • the sheath is generally stored by winding in a coil, and folded on its section by having four bellows. After unwinding of the coil, the opening of the sheath is operated by a mechanical action of spacing at the four corners.
  • the packaging machines for threading a cover of stretch film on the load have for this purpose a spacing device to open the stretch film sheath, and a pleating device for folding the sheath accordion on four fingers integral with the load. a support frame.
  • a welding device is arranged between the spacer device and the pleating device for welding the sheath forming a welded joint.
  • the sheath is then cut transversely by a cutting device to make a cover independent of the coil, and closed at its upper part.
  • the pleated cover is then stretched in a horizontal plane parallel to the weld, and is positioned above the palletized load.
  • the cover is unfolded during the houssage, and deposited on and around the load following a vertical movement up and down the frame. Before being pulled over the load, the cover is stretched in the transverse stretched state longitudinally in the vertical direction by 5% to 15% of its initial vertical length.
  • the mechanism of the packaging machine COVERPAL (registered trademark of the company Thimon), is described in detail in the document EP 1060988.
  • the operations of welding and cutting of the sheath to form the cover, are performed before removal on the pleating fingers, unlike the mechanism described previously in EP 344815.
  • the weld is then perfectly cooled when it is stressed by the transverse drawing, and better withstands the stresses of elongation. There are no specific means provided for effecting vertical elongation of the sheath during the foaming phase following the transverse stretching phase.
  • each finger 12 is provided with a drawing shoe 22 having a shape bent advantageously adapted to the friction of the film during the pleating and unfolding steps.
  • the vertical flank of the finger 12 may be equipped with one or two idle rollers 13, or be equipped with a fixed low friction sliding coating, so as to pinch the sheath and drag down when pleated by the motorized roller 14.
  • the latter is rotated by a geared motor 24, and cooperates with a tilting actuator 20 between a remote position of rest (not shown), and a working position (FIGS. 1 to 3) in contact with the finger 12.
  • the four motorized rollers 14 are rotated in the direction of the arrows F1 and F2 to ensure the pleating of the cover 10 by accumulating accordion in the lower part 12A of the fingers 12.
  • the top of the cover 10 has been closed beforehand by a welded joint 16.
  • the horizontal stretching of the cover in the direction of the arrows F3 and F4 is shown in FIG. 3.
  • the motorized rollers 14 no longer rotate, and can be held in abutment against the pleating fingers 12 so as to tend more or less strongly the upper horizontal part of the cover 10 during transverse stretching. It is also possible to control the actuators 20 to move the motorized rollers 14 during this stretching step in order to allow the film to slide partially on the fingers 12, avoiding any possibility of tearing the film.
  • Such known mechanisms make it possible to obtain a transverse stretching ratio of greater than 10%.
  • the quality of the stretchable ducts makes it possible to obtain transverse stretches of 50% to 100%.
  • the next phase of shading is done by a vertical movement of the frame over the load, so as to cause the progressive unfolding of the cover on the load.
  • the tightening of the stretch film material naturally takes place elasticity, which ensures the stable maintenance of the load.
  • the relaxation of the material and the friction of the film on the fingers also create a vertical tension of the film on the load which also contributes to enhancing the stability.
  • This vertical tension is generated without any particular vertical drawing device, since transverse stretching of 50% to 100% reduces the sheath height, and transmits to the load sufficient cohesive forces to ensure stability, as long as this vertical tension is maintained during removal on the load.
  • the angle of inclination A of the fingers 12 with the vertical direction facilitates the accumulation of folds during pleating by the motorized rollers 14.
  • the clearance between the cover 10 and the fingers 12 increases progressively as one approaches the lower part, with the consequence of a possibility of disorganization of the folds, which are no longer properly guided during of their sliding towards the base of the fingers.
  • a lower angle of inclination A of the fingers 12 would have the main disadvantage of hindering the effect of accumulation of the folds, since the sliding of the film down could no longer occur naturally.
  • the motorized rollers 14, in addition to their pleating function, will also have to perform a second function of pushing downwards, which causes friction on the upper folds, with the risk of forming points or vertical lines of weakness of the sheath before the transverse stretching phase.
  • the stretchable film is temporarily clamped laterally into the lower area of the load or pallet, against a stop which is placed above the fingers.
  • the object of the invention is to develop a method of stretching a packaging cover to obtain a free and regular accumulation without disorganization of the folds during the pleating phase before the transverse stretching, and avoid any risk of tearing the film during the next stage of foaming.
  • One development of the invention is to create a regular and precise pleat strand during the foaming stage, and to deposit it on the load at any height, or on the pallet.
  • Another development of the invention relates to a drawing method for obtaining a controlled tension of the film during the foaming.
  • the drawing method according to the invention is characterized in that the reduction of perimeter around the fingers is limited by a braking and compensating element in the lower part of each inclined finger in order to regularly distribute the folds before the phase of horizontal transverse stretching.
  • a disorganization of the folds after the stretching step may indeed disturb the unfolding during the foaming, creating nips of the folds between them may cause a tear of the sheath.
  • the inclination of the fingers facilitates the accumulation of folds, and limiting the pleating perimeter in the lower part where play is the most important, prevents the disorganization of the folds.
  • the presence of the braking element in the middle of the two edges limits the reduction of the perimeter at the bottom of the fingers, without hindering the descent of the sheath along the fingers. Any formation of successive pinched folds is thus excluded during transverse stretching, which makes it possible to reliably avoid tears during the next step of shading.
  • a regular pleated strand can be created in the film during the foaming phase, by interrupting the downward movement of the cover at a predetermined level, and by rotating the rollers in a second direction of rotation opposite to the first.
  • the stranded film can be accurately deposited at any height level of the palletized load. It is thus possible to create either a mini cover at any level of the load or the pallet, or the sealing and maintenance of the upper part of the load, or the removal of the strand on the top of the pallet support allowing a precise clearance the entrance of an automatic palletizer fork.
  • the strand blocks the lower portion of the cover portion deposited against the drawing shoe, which is at the top of the fingers. This results in a controlled mechanical tension in the film, with a possibility of vertical stretching of the cover whose value is between 5% to 50% vertical elongation.
  • the formation of the strand according to these developments, is possible only if previously, the organization of the folds is perfect.
  • the invention also relates to a device for packaging a palletized load by means of a cover consisting of a plastic stretch film, and comprising an operating frame equipped with pleating and drawing fingers, each finger having a drawing shoe, an inclined lower part, and a motorized roller driven in rotation by a geared motor, means for tilting each motorized roller between a position of spaced apart rest, and a working position in contact with the finger, and means operating the frame to carry out the charging of the load.
  • each finger comprises a braking and compensation element arranged in the low zone of accumulation of the folds where the play between the folded cover before the transverse stretching phase, is the most important, said braking element and of compensation being rectilinear, and extending vertically protruding from the central zone of the lower inclined portion of the finger
  • the braking and compensation element has a width less than that of the finger, and is secured by its base to the movable support of the finger.
  • the opposite end the braking element is arranged under a roller on which is applied the motorized roller during pleating.
  • a clamping element is mounted on the support of each finger extending substantially at the drawing shoe above the corresponding motorized roller.
  • the clamping element is associated with an actuator to be moved between a locking position bearing against the shoe, and a release position spaced from said shoe.
  • the clamping element may be formed by a stop with flexible tip for catching a portion of the cover against said shoe in the locking position.
  • each finger 12 is provided with a straight-line braking element 26 extending vertically protruding from the central zone and having a width L1 smaller than that L2 of finger 12.
  • the basis of the braking element 26 is secured to the movable support 28 of the finger 12, and its opposite end is below the lower roller 13 without touching it.
  • the value of the angle A can be between 0 and 25 °.
  • the braking element 26 constitutes a compensation means arranged in the low accumulation zone where the clearance between the folded cover and the inclined lower portion 12A of the finger 12 is the most important.
  • the presence of the braking elements 26 on the four inclined fingers 1 2 limits the reduction of perimeter around the fingers 12, allowing both an accumulation without annoyance of the folds in the lower part 12A, and a uniform and even distribution of the folds on the along the vertical edges A1 and A2 neighbors.
  • the transverse stretching of the cover 10 can then be operated as in FIG. 3 (arrows F3 and F4), by spacing the supports 28 at the four corners of the frame in a horizontal plane, and avoiding any formation of irregular or risky pinched folds. tears during the foaming phase.
  • a clamping member 30 is mounted on the support 28 of each finger 12, extending substantially at the drawing shoe 22 above the motorized roller 14.
  • the clamping member 30 is coupled to an actuator 32 so as to be moved between a locking position and an unlocking position.
  • the clamping element 30 is formed by way of example by a stop with a flexible rubber tip, bearing in the blocking position against the shoe drawing 22 to pinch the lower portion of the cover 10 at the four corners.
  • the actuator 32 may be constituted by a pneumatic, hydraulic or electric actuating jack.
  • the geared motors 24 of the four rotary rollers 14 are controlled by variable speed drives adjustable according to various parameters, and whose direction of rotation can be reversed during the pleating and foaming phases.
  • the stranded film of the cover 10 can then be deposited on the palletised load CH following a double movement of the four fingers 12 according to the arrows F6 and F7.
  • the fingers 12 are spread apart according to a first translational movement indicated by the arrow F6 (FIG. 7B), followed by a second movement orthogonal vertical clearance (arrow F7, Figure 7C) for the application of the strand 34 on the load CH.
  • clamping elements 30 also makes it possible to make the previous function reliable, thanks to the jamming of the cover 10 in the locked position of the actuators 32. A mechanical tension effect is thus generated in the upper vertical portion of the sheath deposited while maintaining the film stretched.
  • FIGS. 8-11 The different stages of implementation of the process are illustrated in FIGS. 8-11:
  • FIG. 8 shows the step of covering the load CH, which follows the transverse stretching phase of FIG. 3.
  • the clamping element 30 is located in a remote position, and the roller 14 of pleating.
  • the film of the cover 10 slides freely along the arched shoe 22, and the unfolding of the folds takes place progressively and without hindrance during the downward stroke indicated by the arrow F8.
  • the fingers 12 are horizontally brought together to remove the strand 34 at a precise location of the load CH or pallet 36, followed by a release movement of the support 28 of the fingers 12 downwards along the arrow F7.
  • the clamping member 30 is then actuated to the unlocking position to release the strand 34 upon removal.
  • the vertical portion of the cover 10 remains stretched during formation of the pleated strand 34, and can even be stretched by up to 5% to 50% vertical elongation.
  • the vertical tension of the duct section which links the first layer of products with the pallet 36 is essential to ensure good holding of the load.
  • the vertical stretching associated with the strand deposited against the pallet guarantees the stability of the load
  • the clamping member 30 is omitted, and the end of the drawing shoe 22 is sufficiently protruded to retain the strand at the upper part of the finger. This strand is then deposited on the load according to the same cycle described above.
  • the invention also applies to a flat duct, open by the effect of depression, and taken at four points by the frame of the hood.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)

Claims (14)

  1. Verfahren zum Anbringen einer elastischen Verpackungshülle auf einer palettisierten Ladung (CM), welche Hülle aus einem streckbaren Folienschlauch erhalten wird, welches Verfahren folgende Schritten umfasst:
    - Öffnen der Hülle zur Formgebung über der Ladung,
    - Falten der seitlichen Teile der Hülle nach Art eines Akkordeons auf den Faltfingern (12), durch Einschalten motorisierter Rollen (14), die in einer ersten Drehrichtung (F1, F2) drehen, wobei jeder Finger eine Neigung bezüglich der vertikalen Richtung hat,
    - anschließendes Strecken der in Falten gelegten Hülle in transversaler Horizontalrichtung zum Erhalt einer Öffnung, die größer ist als der Umfang der zu umhüllenden Ladung (CM),
    - und Bewegen der gestreckten Hülle über die Ladung (CM) in einer vertikalen Richtung, wodurch die Falten während des Umhüllungshubs nach und nach gespreizt werden,
    dadurch gekennzeichnet, dass man die Verringerung des Umfangs um die Finger (12) herum durch ein Brems- und Ausgleichselement (26) im unteren Teil (12A) jedes geneigten Fingers begrenzt, um die Falten vor der transversalen Horizontalstreckung gleichmäßig zu verteilen.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des Umhüllungsvorgangs die Abwärtsbewegung der Schutzhülle (10) auf einer vorbestimmten Höhe gestoppt und eine Litze (34) gebildet wird, indem man die Rollen (14) in einer zweiten, zur ersten entgegegengesetzten Drehrichtung (F5) drehen lässt.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass man während der Bildung der Litze (34) den aufgebrachten Abschnitt der Schutzhülle (10) im oberen Bereich (12B) der Finger gegen den Streckschuh (22) blockiert.
  4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Litze (34) im oberen Bereich des Fingers gegen einen hervorspringenden Teil des Schuhs (22) zurückgehalten wird.
  5. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass während oder am Ende des Umhüllungsvorgangs die Schutzhülle (10) gegen die Finger (12) blockiert wird, damit eine kontrollierte mechanische, vertikale Spannung in der Folie entsteht.
  6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Folie der Schutzhülle (10) um einen Wert gestreckt wird, der 5 bis 50 % der vertikalen Längung beträgt.
  7. Verpackungsvorrichtung für eine palettisierte Ladung (CH) mittels einer Schutzhülle (10), die aus einer streckbaren Kunststofffolie besteht, die umfasst:
    - einen Bedienungsrahmen, der mit Falt- und Streckfingern (12) versehen ist, wobei jeder Finger einen Streckschuh (22) und einen unteren geneigten Bereich aufweist,
    - eine motorisierte Rolle (14), die von einem Getriebemotor (24) in Drehung angetrieben wird, um mit dem jeweiligen Finger (12) zusammenzuwirken,
    - Mittel zum Schwenken der jeweiligen motorisierten Rolle (14) zwischen einer entfernten Ruheposition und einer Arbeitsposition im Kontakt mit dem Finger (12),
    - Betätigungsvorrichtungen für den Rahmen zur Durchführung der Umhüllung der Ladung (CM),
    dadurch gekennzeichnet, dass der untere, geneigte Teil (12A) jedes Fingers (12) ein Brems- und Ausgleichselement (26) umfasst, das in dem unten gelegenen Bereich angeordnet ist, in dem die Falten übereinandergeschichtet werden und wo das Spiel zwischen der gefalteten Schutzhülle vor der Phase des tranversalen Streckens am größten ist, welches Brems- und Ausgleichselement (26) gerade ist, sich vertikal erstreckt und aus dem mittleren Bereich des unteren, geneigten Teils (12A) des Fingers (12) hervorsteht.
  8. Verpackungsvorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass das Brems- und Ausgleichselement (26) eine Breite (L1) aufweist, die geringer ist als die des Fingers (12), und an seiner Basis fest mit der beweglichen Halterung (28) des Fingers verbunden ist.
  9. Verpackungsvorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass das entgegengesetzte Ende des Bremselements (26) unter einer Walze (13) angeordnet ist, an die die motorisierte Rolle (14) beim Falten angedrückt ist.
  10. Vorrichtung nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass ein Klemmelement (30) an die Halterung (28) jedes Fingers (12) montiert ist und sich im Wesentlichen in Höhe des Streckschuhs (22) über der entsprechenden motorisierten Rolle (14) erstreckt.
  11. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass das Klemmelement (30) mit einem Aktuator (32) verbunden ist, um zwischen einer Blockierungsposition unter Anliegen an den Schuh (22) und einer Freigabeposition entfernt von dem Schuh hin- und herbewegt werden zu können.
  12. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass das Klemmelement (30) von einem Anschlag mit elastischem Ende gebildet wird, das dazu bestimmt ist, einen Teil der Schutzhülle (10) in Blockierungsposition gegen den Schuh (22) zu klemmen.
  13. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Aktuator (32) ein pneumatischer, hydraulischer oder elektrischer Antriebszylinder ist.
  14. Vorrichtung nach einem der Ansprüche 7 bis 12, dadurch gekennzeichnet, dass der Getriebemotor (24) jeder Rolle (14) von einem Regelantrieb mit Drehrichtungsumkehr gesteuert wird.
EP20030354082 2002-11-12 2003-11-07 Verfahren und Vorrichtung zum Umhüllen einer palettisierten Ladung mit einer Stretchfolienhaube Expired - Lifetime EP1419966B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0214088A FR2846943B1 (fr) 2002-11-12 2002-11-12 Procede et dispositif de mise en place d'une housse d'emballage de film plastique etirable sur une charge palettisee
FR0214088 2002-11-12

Publications (2)

Publication Number Publication Date
EP1419966A1 EP1419966A1 (de) 2004-05-19
EP1419966B1 true EP1419966B1 (de) 2007-01-10

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EP20030354082 Expired - Lifetime EP1419966B1 (de) 2002-11-12 2003-11-07 Verfahren und Vorrichtung zum Umhüllen einer palettisierten Ladung mit einer Stretchfolienhaube

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EP (1) EP1419966B1 (de)
DE (1) DE60311050T2 (de)
DK (1) DK1419966T3 (de)
ES (1) ES2279936T3 (de)
FR (1) FR2846943B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2608953B1 (de) 2010-08-26 2015-05-13 Mollers North America, Inc. Eckpfosten-anbringungssystem
DE102010037770B4 (de) * 2010-09-24 2012-06-14 Illinois Tool Works Inc. Verfahren und Vorrichtung zum zumindest teilweisen Umhüllen eines Stückgutstapels mit einem Schlauchabschnitt
ES1077857Y (es) * 2012-09-28 2013-01-18 Innova Maqu Cerámica S L (100 0%) Máquina para revestir cargas paletizadas
DK178374B1 (en) 2014-11-04 2016-01-18 Frank Bruhn Aps HORIZONTALLY ARRANGED WRAP PACKAGING SYSTEM

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE58900904D1 (de) 1988-06-03 1992-04-09 Beumer Maschf Bernhard Verfahren und vorrichtung zum umhuellen von stueckgut, insbesondere stueckgutstapeln, mit einer stretchfolienhaube.
DE9001319U1 (de) * 1990-02-06 1990-04-12 MSK-Verpackungs-Systeme GmbH, 47533 Kleve Vorrichtung zum Überziehen von Stretchfolienhauben über einen Gutstapel
DE4019127C2 (de) 1990-06-15 1994-11-17 Beumer Maschf Bernhard Verfahren und Vorrichtung zum Umhüllen von Stückgut
DE4235409C1 (de) * 1992-10-21 1994-01-13 Moellers Maschf Gmbh Verfahren und Vorrichtung zum Umhüllen eines Stapels mittels Stretchfolie
DE19732298C1 (de) * 1997-07-26 1999-02-04 Moellers Maschf Gmbh Vorrichtung und Verfahren zum Umhüllen eines Stapels
EP1059233A1 (de) * 1999-04-16 2000-12-13 Kl- Lachenmeier A/S Verfahren und Vorrichtung zum Verpacken von Gegenständen in einer Folienhaube
FR2794720B1 (fr) 1999-06-10 2001-08-31 Thimon Procede et dispositif de mise en forme et de depose d'une housse souple thermoretractable sur une charge palettisee

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Publication number Publication date
FR2846943A1 (fr) 2004-05-14
DE60311050D1 (de) 2007-02-22
DK1419966T3 (da) 2007-05-14
EP1419966A1 (de) 2004-05-19
FR2846943B1 (fr) 2005-02-18
ES2279936T3 (es) 2007-09-01
DE60311050T2 (de) 2007-08-16

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