EP0395919B1 - Automatic wrapping machine for packaging products, particularly palletized units, to be wrapped with a thermoretractible tubular film - Google Patents

Automatic wrapping machine for packaging products, particularly palletized units, to be wrapped with a thermoretractible tubular film Download PDF

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Publication number
EP0395919B1
EP0395919B1 EP90106872A EP90106872A EP0395919B1 EP 0395919 B1 EP0395919 B1 EP 0395919B1 EP 90106872 A EP90106872 A EP 90106872A EP 90106872 A EP90106872 A EP 90106872A EP 0395919 B1 EP0395919 B1 EP 0395919B1
Authority
EP
European Patent Office
Prior art keywords
film
machine
casing
reel
tubular film
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.)
Expired - Lifetime
Application number
EP90106872A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0395919A1 (en
Inventor
Franco Tacchini
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.)
Officina Meccanica Sestese SpA
Original Assignee
Officina Meccanica Sestese SpA
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 Officina Meccanica Sestese SpA filed Critical Officina Meccanica Sestese SpA
Priority to AT90106872T priority Critical patent/ATE92419T1/de
Publication of EP0395919A1 publication Critical patent/EP0395919A1/en
Application granted granted Critical
Publication of EP0395919B1 publication Critical patent/EP0395919B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • the present invention concerns an automatic wrapping machine for packaging products and materials, particularly palletized units, which makes use of a tubular film of thermoretractible, respectively thermoshrinkable plastic material, folded flat and rolled up on a respective feeding reel. More precisely, the invention relates to a machine of the type described in the introductory part of Claim 1.
  • An automatic wrapping machine is described for example in DE-B-1 940 783, wherein the material to be wrapped, loaded on a pallet, is positioned at the centre of the base of a tall casing; the reel of film is placed on the top part of said casing, and the film is unrolled from said reel in a flat condition and is guided up to a pair of feed rollers arranged at the centre of said top part.
  • the film is then moved by said rollers in a vertical direction, by guiding its four folding edges into four gripper guides. Said guides then grip the four edges and move, first sideways - to open the tubular film into an upside-down bag - and then downwards, to cause the film to envelop the material loaded on the pallet.
  • the pallet is shifted towards a further working station, where the packaging is completed by shrinking the film under heat treatment, carried out for instance into a suitable furnace.
  • the DE-C-20 26 860 proposes by disclosing an automatic wrapping machine as mentioned in the introductory portion of claim 1 to mount the feeding reel close to the base of the casing and to provide or means carrying the. film to the tory and then guiding it again downwards, over the load, using the same method described in DE-B-1 940 783.
  • the DE-C-32 34 929 thus proposes to still position the feeding reel at the bottom of the casing, but to reverse the actual feeding system by moving the film from the bottom towards the top (instead of feeeding it from the top towards the bottom, as in previous technique).
  • the DE-C-32 34 929 provides for the use, in combination with the conventional vertical gripper guides already used in previous technique:
  • the EP-A1-0 076 867 describes a machine wherein the film is fed laterally of the load by gripping means which draw it from the bottom towards the top. These same means then perform a complicated movement, along an overturned U trajectory, in order to lift a length of film and simultaneously open it into bag, then carry it over an operating unit and finally fit it, from the top towards the bottom, over the load on the pallet.
  • the object of the present invention is to realize a machine apt to carry out both the operation of applying the film bag over the load and the oration of film thermoshrinkage.
  • thermoshrinkage of said film - would have been possible neither in DE-B-1 940 783 or DE-C-20 26 860, in that the reel or film positioned at the top of the casing would be damaged by the heat rising from the ring furnace, nor in DE-C-32 34 929, in that the arms which grip, transfer and apply the film over the load would be interfering with the structure of the ring furnace.
  • the machine according to the present invention allows to surprisingly carry out ail these orations of gripping the film, pulling out a length thereof, transferring said film length and applying it over the palletized unit while moving inside the. ring furnace, by adopting a single system of grippers mounted on movable vertical bars in a simple but very efficient way.
  • the wrapping machine comprises (fig. 1) a working section L and a section A feeding the tubular film PT.
  • the working section L comprises a stout metal casing 1 with four uprights 2, at the centre of which the palletized unit UP (fig. 4) - or other material or product, or group of products - to be wrapped with the thermoshrinkable tubular film PT is positioned for packaging purposes.
  • the four uprights 2 of the casing 1 are connected in twos by means of upper cross members 3, parallel one to the other and strongly projecting from the casing 1 towards the section A feeding the thermoshrinkable film PT.
  • each of the cross members 3 of the casing 1 there is slidably mounted a carriage 4 carrying pairs of vertical bars 5, movable both horizontally - so that their position and reciprocal distance along said cross members depends on the position of the carriage 4 - and vertically, said bars being equipped with pairs of grippers 6, one pair at the lower end and the other higher up, designed to grip the section of tubular film PT with which the material being packaged has to be wrapped.
  • the working section L of the machine according to the invention is completed with a pair of bars 7, for cutting and welding the film, and with a ring furnace 8.
  • the feeding section A comprises means for simply suspending a reel B of thermoshrinkable tubular film PT, consisting of two flexible elements as chains 9 (or possibly ropes or cables) hanging from the free end of each cross member 3 of the casing 1, and of two supporting cones 10 into which are rotatably mounted the ends of the shaft 11 (fig. 18) of the reel B on which the film PT is wound up.
  • the feeding section A also comprises an element, consisting for example of an idle roll 12, to support and guide the reel B, and three idle guide rollers to deviate the unreeled film, of which a movable roller 13 and two fixed and coupled rollers 14, parallel and close to the base of the machine.
  • the carriage 4 consists of two elements 17 and 18, each carrying one of the two pairs of vertical bars 5 of said carriage.
  • the element 18 carries an idle sprocket 19 engaging with a toothing 20 fixed to the casing 1 and with a toothing 21 projecting from the element 17.
  • the piston rod 16A of the cylinder 16 is connected to the element 18 of the carriage 4.
  • the grippers 6 are mounted at the lower ends of the vertical bars 5, and about half way along their length, so as to grip the section of tubular film PT allowing to wrap the palletized unit UP (or other material to be packaged).
  • One of said grippers is shown in detail in figs. 10 to 13. It comprises a pair of jaws 29 reciprocally pivoted, about a vertical axis 30, onto a lever 31 which is in turn pivoted on the bar 5 about a horizontal axis 32.
  • the jaws 29 of the gripper are kept open by a pair of springs 33, while their closing is controlled by a lever 34, fulcrumed horizontally in 35 on the bar 5 and operated by the piston of a fluid pressure cylinder 36, and by a connecting rod 37 which connects the lever 34 to the lever 31.
  • an element 38 is provided to stop the movement of the lever 34.
  • the cutting and welding bars 7 form part of a more complex device shown in detail in figs. 14 to 16.
  • These bars comprise (fig. 14) a pair of longitudinal clamping shoes 39, pressed one towards the other by springs 40 and, fixed to said shoes, two resistor heating elements 41 and a cutting blade 42.
  • the bars 7 are each carried (figs. 15 and 16) by two saddles 43, 44, movable along the cross members 3 under the control of leverages operated by a fluid pressure cylinder 45 and comprising two sets of three levers 46, 47, 48, of which, the end levers 46 are controlled by the cylinder 45, the end levers 48 control the saddles 43, 44, while the intermediate levers 47 are pivoted to an end of the casing 1.
  • the ring furnace 8 is of a substantially conventional type, being formed as a large square metal frame, moving vertically inside the casing 1 and housing heating means, preferably in the form of gas flames to direct the heat towards the inside of said frame, and thus towards the palletized unit UP or other material to be packaged, designed to be fully and closely enveloped by said frame.
  • thermoshrinkable tubular film PT it should be noted that it is most important for the thermoshrinkable tubular film PT to be unreeled with the least lateral deviation, so as to make sure that the film is wrapped around the product being packaged without exceeding in size, as far as possible, the perimeter of said product.
  • the solutions adopted so far are conceived with devices to shift axially the reel shaft, centering manually the film each time a new reel is mounted. It is however possible that, in a same reel, the film may not be wound perfectly straight, there being lateral deviations between the turns.
  • the solution adopted in the machine according to the invention makes it easier to center the reel B each time a new reel is mounted, but above all it allows to keep the reeled film centred while being unrolled.
  • the mounting of the reel by suspension with flexible elements allows to easily and promptly move said reel in the axial sense, as may be required by the unevenness of its winding up, while the lateral shoulders of the reel keep the tubular film guided in the wanted position.
  • the tubular film PT emerging - flattened and with inwardly folded sides - from the idle roll 12 supporting the reel B, winds onto the vertically moving roller 13 and onto the two fixed bottom rollers 14.
  • the roller 13 of the feeding section A moves first upward, unrolling said film from the reel B of which it causes the rotation (while, downstream, the film is kept stationary as seen hereinafter), and then downward when the film PT, drawn by the machine, starts moving.
  • the feeding to the working section L of the machine thus takes place without the reel B being dragged into rotation with negative stresses due to inertia.
  • the film is positioned as shown in fig. 1, still substantially flattened and closed at its free end, at the top of the machine, by the transversal welding performed in the previous cycle, while strikers (not shown) act on its lateral folds, below said free end, to hold it in position.
  • the roller 13 is in top position.
  • the cycle starts with the downward movement of the four bars 5 (fig. 1), while the carriages 4 are positioned in correspondence of the portion of the cross members 3 projecting from the casing 1 and said bars 5 are drawn close.
  • the grippers 6 (fig. 1) - with open jaws and spaced from the folded tubular film PT (as shown in figs. 10 and 11) - are operated so as to grip the edges of said film in correspondence of eight points, two for each bar 5.
  • This is obtained (figs. 10 to 13) by downstroke of the piston of the cylinder 36, and by anticlockwise rotation of the lever 34 and - thanks to the connecting rod 37 - of the lever 31; the grippers 6 - with the jaws kept open by the springs 33 - move from the position (figs. 10 and 11) far from the film, to the position (figs. 12 and 13) close to the edges of the film, and in this position the lever 31 stops against the element 38.
  • the lever 34 continues to rotate, controlled by the further downstroke of the piston 36, and thus overcomes the resistance of the springs 33, causing the closing of the jaws 29 of the grippers 6, which hence grip in correspondence of eight points (fig. 1) the edges of the thermoshrinkable tubular film PT, thereby opening it slightly.
  • the bars 5 are then caused to move upward by operating the electric motors 26 (fig. 9) while the carriages 4 are still stationary.
  • the film (fig. 2) moves to the top, while being kept still folded but slightly open at the edges.
  • the roller 13 of the feeding section L moves downward to shift forward the film without causing the rotation of the reel B, which remains still.
  • the cylinder 45 causes, through the already described leverage, the mutual approach of the cutting and welding bars 7, until (fig. 3) the shoes 39 clamp the folded tubular film, the heating elements 41 provide for the welding thereof, and the blade 42 provides to cut said film above the welding point.
  • the section of tubular film PT already gripped by the grippers 6, takes up the configuration of a bag - open at the bottom and closed at the top - positioned in the upper part of the machine and apt to wrap the material to be packaged, but still folded (fig. 3).
  • the end of the tubular film coming from the feeding section A is clamped and closed at the top.
  • the aforementioned bag must now be carried over the material to be packaged: this is obtained through a horizontal movement of the carriage 4 caused by operating the fluid pressure cylinders 16 (fig. 8).
  • the elements 17 and 18 of the carriage 4, carrying the bars 5, are moved - as seen - with different laws, so that the two front bars 5 move away from the rear ones causing the opening of the bag formed by the film PT, the opening being completed when said bag is positioned - taking up a prismatic square shape SP - at the centre of the casing 1, above the material UP to be wrapped (fig. 4).
  • the roller 13 of the feeding section is slowly moved upward from the previously reached lowered position. Since the free end of the folded tubular film is still clamped - and thus prevented from moving - by the shoes 39 of the welding and cutting bars, the upward movement of the roller 13 allows to unroll new film from the reel B - slowly caused to rotate - so as to form the bag for the successive cycle.
  • the bars 5 are moved downward (fig. 5) by operating the motors 26 in a reversed sense from the previous one (fig. 9); the palletized unit UP is then wrapped with the bag SP formed by the thermoshrinkable tubular film PT. At the same time, the ring furnace 8 moves down, while the welding and cutting bars 7 (fig. 5) draw apart.
  • the jaws 29 of the grippers 6 are now opened and the bars 5 are again moved upward (fig. 6), thereby releasing the palletized unit UP finally wrapped with the thermoshrinkable tubular film formed as a prismatic bag.
  • the ring furnace 8 is turned on, while being in its lowest position, and is then slowly moved upward (fig. 7) at a speed allowing to obtain the desired degree of retraction of the film wrapping the unit UP.
  • the machine ends its working cycle with the return of the carriage 4, and thus of the bars 5, into the initial position in which said bars are drawn close, next to the feeding section A of the machine (fig. 1).
  • the solution adopted in the machine according to the invention prevents this risk because, thanks to the grippers, the top part of the bag takes up a prismatic shape of rectangular or square section SP, and is kept in that shape.
  • the movement of the two elements 17 and 18 of the carriage 4 could be obtained (instead of using the aforedescribed and illustrated toothing and sprocket system) by means of two fluid pressure cylinders, suitably offset in operation, while the cutting system of the bars 7 could have a different configuration.
  • the feeding section A of the machine could be simplified by eliminating the movable guide roller 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
EP90106872A 1989-05-02 1990-04-10 Automatic wrapping machine for packaging products, particularly palletized units, to be wrapped with a thermoretractible tubular film Expired - Lifetime EP0395919B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90106872T ATE92419T1 (de) 1989-05-02 1990-04-10 Automatische maschine zum verpacken von gegenstaenden, insbesondere palettenladungen, mit einer heissschrumpfbaren schlauchfolie.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8920343A IT1229317B (it) 1989-05-02 1989-05-02 Macchina incappucciatrice automatica per l'imballaggio di prodotti, in particolare di unita' pallettizzate, con pellicola tubolare termoretraibile.
IT2034389 1989-05-02

Publications (2)

Publication Number Publication Date
EP0395919A1 EP0395919A1 (en) 1990-11-07
EP0395919B1 true EP0395919B1 (en) 1993-08-04

Family

ID=11165887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106872A Expired - Lifetime EP0395919B1 (en) 1989-05-02 1990-04-10 Automatic wrapping machine for packaging products, particularly palletized units, to be wrapped with a thermoretractible tubular film

Country Status (5)

Country Link
EP (1) EP0395919B1 (it)
AT (1) ATE92419T1 (it)
DE (1) DE69002529T2 (it)
ES (1) ES2045618T3 (it)
IT (1) IT1229317B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9126703B2 (en) 2010-04-15 2015-09-08 Msk-Verpackungs-Systeme Gmbh Method and apparatus for wrapping a foil around a stack of objects

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2816587B1 (fr) * 2000-11-16 2003-03-07 Thimon Procede et dispositif de houssage et de thermoscellage d'une housse en matiere plastique thermoretractable pour constituer un emballage etanche sur une charge palettisee
ES2264320B1 (es) * 2004-04-23 2007-12-01 Joan Bago Grabulosa Procedimiento para obtener un embalaje tubular destinado a la fabricacion de sacos o contenedores.
MX2009002549A (es) * 2006-09-15 2009-03-25 Lachenmeier As Dispositivo embalador, mecanismo de reten para un dispositivo embalador y proceso para operar el mismo.
FR2967648B1 (fr) 2010-11-22 2012-12-07 Thimon Procede et machine d'emballage par robot d'une charge palettisee au moyen d'une housse en matiere plastique souple
CN117864485B (zh) * 2024-03-12 2024-05-14 佳木斯大学 一种牙科影像胶片包装生产装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2026860A1 (it) * 1969-06-03 1970-12-17

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1940783B1 (de) * 1969-08-11 1971-03-18 Keller & Co C Vorrichtung zum Umhuellen von Stapeln,insbesondere von Ziegelstapeln,mittels Folienschlauch
GB1333125A (en) * 1971-12-09 1973-10-10 Dapplications Thermiques Sa So Machines for placing envelopes over objects to be packaged
FR2474440A1 (fr) * 1980-01-30 1981-07-31 Thimon Sa Installation d'emballage d'une charge dans un troncon de gaine en un materiau souple
ATE19223T1 (de) * 1981-10-09 1986-05-15 Axel Frommelt Verfahren und vorrichtung zum ueberziehen groesserer gegenstaende mit einer schlauchfolie.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2026860A1 (it) * 1969-06-03 1970-12-17

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9126703B2 (en) 2010-04-15 2015-09-08 Msk-Verpackungs-Systeme Gmbh Method and apparatus for wrapping a foil around a stack of objects

Also Published As

Publication number Publication date
DE69002529T2 (de) 1994-02-17
IT8920343A0 (it) 1989-05-02
IT1229317B (it) 1991-08-08
ATE92419T1 (de) 1993-08-15
EP0395919A1 (en) 1990-11-07
ES2045618T3 (es) 1994-01-16
DE69002529D1 (de) 1993-09-09

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