EP1510460B1 - Procédé et appareil pour le suremballage scellé d' une charge avec un film tubulaire en matériau plastique étirable. - Google Patents

Procédé et appareil pour le suremballage scellé d' une charge avec un film tubulaire en matériau plastique étirable. Download PDF

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Publication number
EP1510460B1
EP1510460B1 EP04103938A EP04103938A EP1510460B1 EP 1510460 B1 EP1510460 B1 EP 1510460B1 EP 04103938 A EP04103938 A EP 04103938A EP 04103938 A EP04103938 A EP 04103938A EP 1510460 B1 EP1510460 B1 EP 1510460B1
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EP
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Prior art keywords
film
overwrapping
bag
frame
load
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EP04103938A
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German (de)
English (en)
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EP1510460A1 (fr
Inventor
Franco Tacchini
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Officina Meccanica Sestese SpA
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Officina Meccanica Sestese SpA
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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
    • 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 relates to a process and to an apparatus for the sealed overwrapping of a pallet-stacked load by means of a film of stretchable plastic material having a tubular shape.
  • a pallet-stacked load is brought in a wrapping position in the middle of a main support structure of a wrapping apparatus.
  • a plastic wrapping film having a tubular shape but folded longitudinally on a plane to be wound onto a feeding roll, is guided from a position at the bottom of said main support structure to a position above the top of the pallet load.
  • Such film is then guided downwards and at the same time opened at the bottom end thereof, so as to form a sort of upturned bag.
  • Such bag is first of all removed from the feeding roll performing a horizontal cut and simultaneous thermal welding along the top end edge.
  • Such upturned bag is then force-fitted onto and around the pallet load, until it is completely wrapped around the load.
  • the final wrapping step consists in the shrink-welding of the bag on the load, which occurs subjecting the wrapping film to shrinking by heat.
  • the bag force-fitting step is preceded by a step of temporary stretching and widening of the bag itself, so that the wrapping final step consists in the release of the bag which, due to elastic action, returns into its initial condition and hence automatically shrinks around the load.
  • the present invention relates indeed to an overwrapping apparatus of this kind, that is one which employs a film of stretchable plastic material.
  • Italian patent IT-1.074.012 in the name of ANVAR (corresponding to patent FR-2.316.127 filed on 4.7.1975), describes a wrapping apparatus in which means are provided to feed the tubular film above the load, and gripping means which grip the wrapping bag at the four corners thereof, open it and drag it downwards over the bottom of the pallet along four substantially vertical tracks.
  • each of such tracks has a first vertical portion, which extends in height exclusively over the pallet load and which defines a plan perimeter corresponding to the bag largest unstretched size, a second vertical portion, which extends over the entire height of the pallet load and which covers a plan perimeter of a size larger than the size of the load itself, as well as a third oblique portion, which joins the bottom end of the first portion, which is the innermost and narrowest one, and the top end of the second portion, which is the outermost and widest one.
  • said third portion of the four tracks forms a path defining a plan perimeter becoming gradually wider in the bottom portion thereof; such path hence forms an oblique widening portion, along which a temporary widening of the bag is produced, due to the elastic stretching in a crosswise direction.
  • the bag thus widened, following the second portion of the tracks, is then force-fitted on the load and on the pallet. Once finished, the gripping means are released, to let the bag elastically resume its original condition and shrink on the load.
  • said support framework is horizontally widened, both longitudinally and transversally, so as to bring the four pin supports, with the ruffled bag thereon, to define a perimeter having a larger plan size than the load plan size.
  • said framework with the four pin supports is made to vertically slide downwards to the bottom of the pallet, while the bag is progressively released from the same pin supports and force fitted onto the load; in this third step the stretched film freely returns into its initial condition, shrinking on the load.
  • Wrapping apparatuses of this type i.e. equipped with means to ruffle the bag in a first step, then to stretch it horizontally in a second step, and finally to spread it out in a third step while simultaneously applying it to the load, are also known from patents DE-39 08 957 dated 18.3.1989, EP-0.344.815 and EP-0.445.443, both filed on 5.6.1989, EP-0.798.214 filed on 27.3.1997, EP-1.072.514 filed on 21.7.2000, all in the name of BERNHARD BEUMER MASCHINENFABRIK, as well as from patent DE-43 27 450 in the name of MOELLERS, which are all based on the same operation mode and differ from each other essentially through construction details.
  • a) - the film of the wrapping bag remains stretched only in a horizontal direction (i.e. transversally to the vertical axis of the upturned bag): in fact, when the pin supports, or similar, onto which the tubular film is ruffled, are mutually spaced apart, they cause a horizontal stretching of the film; when such supports are shifted vertically, to force-fit the film on the load, said film is simply released from said supports, without any vertical stretching;
  • the film is guided only in correspondence of the four corners of the adjustable widening frame, so that said film tends, due to its elasticity and to the remarkable stretching it was subject to, to take up an arched shape along its edges, thereby affecting the release conditions on the load;
  • the wrapping apparatus must be much higher than the load: the tubular film is in fact fed from a roll housed in the proximity of the bottom of the apparatus, upwards and over the load, then it is deviated downwards, on the load, hence the tubular film is stretched open and guided on the pin supports to the four corners of the adjustable widening frame; that necessarily implies that the apparatus be at least as tall as the space necessary to guide and stretch open the tubular film over the top height provided for the load.
  • fig. 1 is an elevated and partially sectioned diagrammatic view of the wrapping apparatus according to the invention, in the collection position of the tubular film on the adjustable widening frame, to form a ruffled bag;
  • fig. 2 is a view similar to that of fig. 1, but in the position of initial displacement of the tubular film from the adjustable widening frame to the load;
  • fig. 3 is a plan and partly sectioned diagrammatic view of the same apparatus of fig. 2;
  • fig. 4 is an enlarged view of the selection and collection station of different types of tubular film to feed, shown by arrow S1 in figures 1 and 2;
  • fig. 5 is an enlarged view of the transfer carriage mounting the adjustable widening frame, in the initial position of the step of tubular film application on the load;
  • figs. 6 and 7 are elevated and partly sectioned plan views, respectively, in an even more enlarged scale, of the tubular film-collecting and film-ruffling assembly on the adjustable widening frame of the transfer carriage, shown by arrow R in figure 5;
  • figs. 8 and 9 are views similar to those of figs. 6 and 7, showing an embodiment of the tubular film-collecting and film-ruffling assembly.
  • figs. 10a to 10c show in a very diagrammatic way an embodiment of the tubular film welding and cutting assembly at the bottom end thereof, equipped with cooling means of the welding.
  • the wrapping apparatus comprises a single main support structure, formed by four posts 1 (marked 1a, 1b, 1c, and 1d in fig. 3), held by crossmembers 2 and 3 at top and bottom.
  • Said main support structure is located beside the transport line T (diagrammatically represented by a simple box in fig. 1, since it is a known device, not being part of the present invention) on which the load C, generally a pallet-stacked load to be packaged, moves (in a direction perpendicular to the plane of the drawing sheet).
  • feeding of the tubular film and collection thereof on the adjustable widening frame occur in correspondence of the main support structure 1,2,3, whereas distribution and application of the tubular film on the load, to form the corresponding packaging, occurs outside the main support structure, in correspondence of the transport line T.
  • the transport line T for this purpose there are mainly provided:
  • the selection and collection station S1 is represented in a diagram in fig. 1 and in greater detail in fig. 4.
  • Said station comprises multiple supports - three supports in the case illustrated - for an equal number of rolls B1, B2, B3 feeding the tubular film P1, P2 P3.
  • the tubular film, to be wound onto rolls is folded on a plane, that is so as to form two parallel, main plane sides, joined to two sides folded concertina-like; the cross section of this configuration, which is well known, is the one represented in fig. 3, diagrammatically represented by phantom lines and marked by reference P.
  • Each of said feeding and opening assemblies has a structure known per se, which is not part of the present invention, and which will therefore not be described in further detail.
  • a cutting and welding assembly (not better shown, since it is known per se and in any case it is not part of the present invention); such device is in any case diagrammatically represented in fig. 4, and comprises a pair of fixed crossmembers 7, along which cutting and welding means shift.
  • Such means comprise, more accurately, two welding presser 7a and cutting blade 7b assemblies, operated in opposite directions by two corresponding jacks 7c.
  • the two jacks 7c are capable of bringing the respective pressers 7a in mutual contact along the middle line Y ⁇ Y (see fig. 3) to perform the welding, and then blades 7b to cooperate in cutting the tubular film along the same line.
  • each of the two welding presser 7a and cutting blade 7b assemblies comprises a cooling presser 7e; said cooling presser is, as is evident from the drawing, a preferably square tubular bar in which air or possibly cooling liquid is made to flow.
  • first pressers 7a are brought into mutual tight contact and grip between each other the double sheet of wrapping film to perform the thermal welding.
  • the cutting blades 7b are made to advance; which blades separate the film portion which has already formed the upward open bag using P3 which is fed from the corresponding roll.
  • cooling pressers 7e upon closure of pressers 7a and of blades 7b, cooling pressers 7e are also closed (Fig. 10b); their mutual contact and clamping of the film, in a position above the welding point - as shown in fig. 10b - offers a first advantage and precisely that the welding heat does not diffuse upwards, along the film, but remains concentrated in the clamping position of the pressers 7a, allowing a more accurate welding.
  • pressers 7e Upon opening of pressers 7a and of blades 7b, pressers 7e also temporarily open to allow a brief upward sliding of the film; as soon as the welding line arrives in correspondence of the pressers 7e (fig. 10c), said pressers tighten again and clamp the welding, cooling it.
  • a second advantage is thereby obtained, i.e. that the welding, well cooled before being subjected to stretching, is much more stable and not at risk of yielding and opening during the subsequent steps of stretching and application of the bag onto the load to be wrapped.
  • the transport system S2 for feeding and guiding the film comprises (see also fig. 3 in the left portion of the drawing) a beam carriage 8, vertically sliding along posts 1a and 1b under the control of a motor drive 8a.
  • a beam carriage 8a On such carriage are mounted cantilevered two arms 9a and 9b, which can be shifted along the beam carriage 8, in a specularly symmetrical way to the middle transversal axis X-X, through respective motor drives 10.
  • On each of said two arms 9a and 9b are mounted pairs of grippers 11,12, which are in turn mounted sliding along such arms in a specularly symmetrical way to the longitudinal middle axis Y-Y of the main support structure 1.
  • grippers 11, 12 of each pair of grippers of the tubular film P are moved closer together, at the centre of arm 9a, 9b, but are open to receive the edges Pa, Pb of the tubular film itself; said edges correspond to the upper open edge of the film carried by the opening device 6c which at that time is in correspondence of grippers 11, 12.
  • grippers 11, 12 Once grippers 11, 12 have gripped edges Pa, Pb, carriage 8, 9a, 9b moves upwards dragging the tubular film therewith, which unrolls from the respective feeding roll. Simultaneously to this upward movement, grippers 11, 12 of each of the arms 9a, 9b are moved apart from each other (see intermediate position in fig. 1), opening the tubular film from the initial situation, marked by P and with phantom lines in fig. 3, up to the final situation, marked by P' and with phantom lines in the same figure 3.
  • the adjustable widening frame 13 is mounted on carriage 14 and is capable of becoming wider or narrower than carriage 14 itself.
  • Said carriage is capable of shifting horizontally, in a crosswise direction to the movement direction of load C, along a guiding system formed on each of the two support plates 15; carriage 14 is further capable of shifting vertically, together with said two plates 15, which are capable of shifting along a guiding system formed on the pair of posts 1c and 1d.
  • the adjustable widening frame 13 is capable of shifting both in a crosswise direction X-X and in a longitudinal direction Y-Y, to become wider or narrower;
  • carriage 14 shifts in a crosswise direction X-X, i.e. parallel to the plane of the sheet of fig. 3, from a position (on the left hand side in the drawing of fig. 1) collecting the tubular film to a position (on the right hand side in the drawing of fig. 2) applying the tubular film on the load, and
  • the pair of plates 15 shifts only in a vertical direction Z-Z, to vertically transport both carriage 14 and the adjustable widening frame.
  • the two plates 15 are mounted vertically sliding along posts 1c and 1d, respectively, of the main support structure, i.e. the two posts which are on the side of the load transporter T.
  • said plates are mutually linked by crossmembers 15a, meant to form a rigid cage therewith; such crossmembers 15a, however, do not obstruct the free transversal movement of carriage 14.
  • the vertical movement of cage 15, 15a is guaranteed by a guiding system integral with posts 1c, 1d, diagrammatically represented by rollers 15b and not better shown since already known and in any case not being part per se of the present invention.
  • Each collection assembly is mounted on an own saddle 23a, 24a, 25a, and 26a; such saddles are mounted sliding in pairs on crossmembers 19 and 20, in a way specularly symmetrical to the middle axis X-X.
  • Such movement occurs under the control of two respective motors 27 and 28, each driven in perfect parallelism in correspondence of the respective crossmember 19 or 20 thereof, and by two respective drive chains, also mounted in the manner described for chains 22;
  • Such rods are preferably tubular, having a circular section, for the purpose better described in the following.
  • a particularly interesting advantage of the adjustable widening frame arrangement just described - with respect of the prior art of DE-39 08 957 which, for the widening of frame 13, provide two jacks arranged according to the frame diagonals - is the following: by driving the common motor 21 in a way independent from the actuation of the pair of motors 27, 28, it is possible to vary the shape and size of frame 13, i.e. it is possible to vary within wide margins the ratio between the length of a pair of opposite sides of frame 13 and the length of the other pair of sides. In other words, it is possible to adjust the shape of frame 13 to the shape of the pallet load to be wrapped, i.e. to give frame 13 a rectangular shape with the longer axis according to Y1-Y1 (as shown), or a square shape, or a rectangular shape with the longer axis according to X-X.
  • This adjustment of the shape of frame 13 preferably occurs before ruffling of the wrapping bag, so that, in the subsequent widening step, it is possible to control the lengthening of the sides of frame 13 so as to cause a stretching of the stretchable film of the bag, in an even way on all four sides.
  • telescopic rods 29 automatically follow the varying shape of frame 13 or the size ratio of the sides thereof, since the ends of said rods are joined directly to the four collection and ruffling assemblies.
  • the function of such telescopic rods is essential, not so much in order to establish a structural connection among the four collection and ruffling assemblies at the four corners of the frame, as to physically set up the sides of the adjustable widening frame;
  • such telescopic rods - having a tubular shape with a circular section - are in fact capable of offering a rounded surface, onto which the wrapping film can glide and be guided during the step of turning inside-out and release onto the load to be wrapped. The film is hence guided on a rounded surface which extends over the entire contour of the adjustable widening frame.
  • FIG. 6 and 7 a first embodiment of one of said collection assemblies 23, 24, 25, 26 is shown in greater detail, as said, onto which tubular film P ruffles; in the following only assembly 25 is described, the other assemblies being identical thereto.
  • Said group 25 (like each of the other three assemblies, in a symmetrical way) comprises a pair of motor-driven wheels 30, mounted on mutually perpendicular axes 31.
  • wheels 30 have such a periphery profile, and are positioned one in respect to the other so that their contour arrives substantially in mutual contact at a point TR representing in practice the gripping point of film P, and the dragging point, as is better described in the following.
  • a third wheel 32 is found, mounted freely rotating on a pin 32a, carried by a support triangle 33; the plane of wheel 32 is substantially oriented according to the vertical plane of the bisectrix of the angle formed by the collection assembly 25.
  • Triangle 33 can perform a short oscillation run within said bisectrix plane, which run is controlled by jack 34. Thanks to this way of mounting, wheel 32 goes from a rest position, in which it is at a short distance from the contour of the pair of wheels 30, to a work position in which it is in close contact with said contour of wheels 30 (s.
  • the arrangement is virtually inverted, at least as far as the motor drive is concerned, which is not on a pair of wheels within the adjustable widening frame (as in the case of wheels 32), but on outer wheel 40. Furthermore, within the frame the film rests - not so much on wheels 32 and on the subsequent ruffling angular post 36 - but directly on the profile of angular post 42 which, in correspondence of the resting area TR of wheel 40, is formed by a sliding block 41 made of a material having a low friction coefficient, in particular a sliding block made of Teflon® .
  • first of all the operator provides to arrange the rolls of tubular film on the respective supports B1, B2, B3, to insert each film in the respective unwinding path P1, P2 and P3 up to transmission rollers 4a, 4b and 4c, and finally to engage the open upper side thereof with opening devices 6a, 6b and 6c, respectively.
  • the automatic control system of the apparatus (or the operator himself in less automated apparatuses) provides to bring opening device 6a, or 6b, or 6c - according to the type of wrapping film required - in correspondence of the pair of grippers 11, 12 of the gripping carriage 8.
  • carriage 8 shifts upwards and grippers 11, 12 simultaneously depart from each other to open the tubular film in the way illustrated on the left hand side of figs. 1 and 3 (phantom profile P').
  • the movement of the tubular film P continues upwards as long as the free upper edge thereof is force-fitted over the four wheels 35 (fig. 6, 7) - or over sliding blocks 41 (fig. 8, 9), respectively - of collection assemblies 23, 24, 25, 26, and in the space between meeting point TR of wheels 30 with the opposite pressure wheel 32, or of wheel 40 with sliding block 41, the pressure wheel being kept apart, in this step, in its rest position.
  • jack 34 is operated to bring wheel 32 in close contact with wheels 30 (or wheel 40 against sliding block 41), and hence lock the open upper end of the film bag on the adjustable widening frame 13.
  • said welding and cutting line remains facing downwards, as diagrammatically shown by the welding footstalk PP shown in the middle lower part PI of film P, which closes below the adjustable widening frame, as diagrammatically shown in figure 5.
  • Such welding and cutting operation can be performed immediately after having locked the open upper end of the bag between wheels 30, 32 - as mentioned - or even shortly after the start of rotation of wheels 30, 32, with a delay depending on the desired length of the wrapping bag: such length may in fact, at least in certain cases, exceed the measure comprised between the lower end stop and the upper end stop of carriage 8, 9.
  • shifting of transfer carriage 14 is performed from the main support structure area 1, 2 (wherein station S1 selecting the tubular film and system S2 transporting and forming the ruffled bag are arranged), shown on the left hand side of fig. 1, to the area of the pallet transporter T (wherein the application station of the tubular film on the load is located), shown on the right hand side of fig. 2.
  • This step consists exclusively in the shifting of carriage 14, together with adjustable widening frame 13, along the guide defined by rollers 16, in a crosswise direction, i.e. parallel to the axes X-X of the apparatus.
  • the work step just described at point E) is associated with the widening step of frame 13.
  • film P has ruffled on the four collection assemblies 23, 24, 25 and 26, such assemblies are mutually spaced apart, moving them in the directions shown by arrows F in fig. 3.
  • film P is elastically stretched until it assumes a shape (such as the one shown by the phantom line on the right hand side of fig. 3) which, seen in plant, corresponds to a larger quadrilateral than the quadrilateral corresponding to load C.
  • Such opening step of the adjustable widening frame can be performed immediately before the crosswise shift of carriage 14 or also simultaneously therewith, or also immediately after such shift, i.e. when carriage 14 is already above transporter T.
  • carriage 14 first of all brings the lower plane part PI of film P into contact and resting on the top of the load. Therefore, according to a fundamental feature of the present invention, as carriage 14 travels down, the walls of the bag which free themselves from the ruffling area 36, 42, change from a position on the outside of each edge of section bar 36 (or 42), above wheels 30, which now rotate in an opposite direction to F', hence above respective wheel 35 - or above sliding block 41 - to a position on the inside of adjustable widening frame 13, after having passed over telescopic rods 29 and wheel 35 (or sliding block 41), on the inner side thereof, until said walls adhere to load C.
  • the film bag turns inside out as it adheres to load C.
  • the apparatus according to the invention can be manufactured, in its structure comprising posts 1 and transfer carriage 14, as a unit assembly separated from the load transport system T, so that it becomes possible, thanks to this circumstance and to the moderate height of said structure, to manufacture said assembly as an entirely prefabricated unit and then displacing it to the mounting site. That avoids having to build, mount and test the apparatus in the workshop, then taking it apart, at least partly, to move it to the site of use and there reassemble it and retest it for operation, as occurs for prior art apparatuses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Transplanting Machines (AREA)
  • Making Paper Articles (AREA)

Claims (33)

  1. Procédé de suremballage de charges empilées sur des palettes (C), dans lequel un film d'emballage (P) constitué d'un matériau étirable, d'une forme tubulaire, est distribué depuis un rouleau d'alimentation (B1, B2, B3), une section dudit film tubulaire étant ensuite séparée dudit rouleau et fermée par thermosoudage (7) à une de ses extrémités de manière à former un sac ouvert à l'extrémité opposée, à partir de laquelle extrémité ledit sac est froncé sur un cadre à élargissement réglable (13), lequel cadre est finalement ouvert sur sa largeur, ce qui provoque un étirement élastique transversal du film tubulaire, et est finalement déplacé vers le bas le long de la charge (C) pour libérer ledit sac de film sur la charge elle-même, caractérisé en ce que
    - ladite section de film tubulaire est alimentée en amont, thermosoudée à son extrémité inférieure (7) pour former un sac d'une taille prédéterminée, comportant une ouverture vers le haut, séparée du rouleau d'alimentation et fixée à ladite extrémité supérieure ouverte sur ledit cadre à élargissement réglable (13), et ledit sac est récupéré et froncé (TR) sur ledit cadre à élargissement réglable avec un mouvement ascendant,
    - ledit cadre (13) est ouvert sur sa largeur, ce qui soumet ledit sac froncé à un étirement dans une direction horizontale,
    - ledit film tubulaire est retourné et freiné au cours de l'étape de libération et d'adhérence à la charge, avec un mouvement descendant, en le soumettant à un étirement dans une direction verticale, alors qu'il est amené à se déplacer et guidé le long de la totalité du contour du cadre à élargissement réglable.
  2. Procédé de suremballage de charges empilées sur des palettes (C) selon la revendication 1, caractérisé en ce que l'étape de préparation du sac froncé
    qui consiste en les opérations d'alimentation du film (P) avec un mouvement ascendant, de séparation du film du rouleau d'alimentation de celui-ci, de thermosoudage du bord inférieur de celui-ci et de récupération et de fronçage dudit sac sur ledit cadre à élargissement réglable (13),
    est exécuté dans une zone d'exploitation (1, 2, 3) adjacente à la zone (T) dans laquelle les palettes devant être emballées sont manutentionnées.
  3. Procédé de suremballage de charges empilées sur des palettes (C) selon les revendications 1 ou 2, caractérisé en ce qu'il comprend une étape de déplacement du cadre à élargissement réglable (13) avec un mouvement de décalage horizontal de la position à laquelle ladite étape de préparation du sac froncé a lieu à une position au-dessus de la palette (C) devant être suremballée, et en ce que l'ouverture sur la largeur dudit cadre à élargissement réglable (13) pour étirer élastiquement le sac froncé dans une direction horizontale a lieu au cours de ladite étape de déplacement.
  4. Procédé de suremballage de charges empilées sur des palettes (C) selon les revendications 1 ou 3, caractérisé en ce que le film tubulaire (P) est freiné alors qu'il est libéré sur la charge, de manière à provoquer un étirement vertical de celui-ci également.
  5. Procédé de suremballage de charges empilées sur des palettes (C) selon la revendication 1, caractérisé en ce que l'étape de préparation du sac froncé
    qui consiste en les opérations d'alimentation du film (P) vers le haut, de séparation du film du rouleau d'alimentation (B1, B2, B3) de celui-ci, et de thermosoudage du bord inférieur de celui-ci et de récupération et de fronçage du sac sur ledit cadre à élargissement réglable,
    est précédée par une étape de détermination de la forme et de la taille initiales dudit cadre à élargissement réglable (13).
  6. Procédé de suremballage de charges empilées sur des palettes (C) selon la revendication 5, caractérisé en ce que ladite étape de détermination de la forme du cadre à élargissement réglable est obtenue en allongeant ou en raccourcissant une paire de côtés opposés du cadre (29), indépendamment de l'allongement ou du raccourcissement de l'autre paire de côtés opposés (29) dudit cadre.
  7. Procédé de suremballage de charges empilées sur des palettes selon la revendication 5 ou 6, caractérisé en ce que le rapport entre la longueur d'une paire de côtés de cadre opposés (29) et la longueur de l'autre paire de côtés opposés (29), établies à ladite étape de détermination de la forme du cadre à élargissement réglable (13), est maintenu inchangé au cours de l'étape d'ouverture sur la largeur du cadre.
  8. Procédé de suremballage de charges empilées sur des palettes selon la revendication 1, caractérisé en ce que l'étape de préparation du sac froncé,
    qui consiste en les opérations d'alimentation du film avec un mouvement ascendant, de séparation dudit film du rouleau d'alimentation de celui-ci, de thermosoudage de l'extrémité inférieure de celui-ci et de récupération et de fronçage dudit sac sur ledit cadre à élargissement réglable,
    est précédée par une étape de sélection de la taille du film tubulaire (P1, P2 ou P3) prévu pour former le sac d'emballage.
  9. Procédé de suremballage de charges empilées sur des palettes selon la revendication 1, ou selon l'une quelconque des revendications 1, 5 et 8, caractérisé en ce que la ligne de thermosoudage du bord inférieur du sac d'emballage est soumise à un refroidissement avant d'être soumise à un étirement.
  10. Dispositif de suremballage d'une charge empilée sur une palette, comprenant une structure de support principale rigide (1, 2, 3), un moyen (S1 ; B1, B2, B3) pour fournir un film d'emballage (P1, P2, P3) constitué d'un matériau étirable tubulaire, un moyen (7, 7b) destiné à découper une section dudit film tubulaire, et un moyen (7, 7a) destiné à thermosouder un premier bord de celui-ci pour former ladite section de film sous forme d'un sac, un moyen (11, 12) destiné à ouvrir ledit film en forme de sac (P) le long du bord extérieur de celui-ci et pour le froncer sur un cadre à élargissement réglable (13), un moyen (17, 18, 21, 22 ; 23, 24, 25, 26, 27, 28) destiné à ouvrir sur la largeur ledit cadre et à étirer transversalement ledit film en forme de sac, de même qu'un moyen (15, 15a, 15b) destiné à faire coulisser ledit cadre à élargissement réglable (13) le long de la charge (C) positionnée dans un poste d'enveloppement (T), libérant progressivement le film en forme de sac (P) sur la charge (C) elle-même, caractérisé en ce que
    - ledit cadre à élargissement réglable est formé par quatre ensembles de récupération et de fronçage de film (23, 24, 25, 26), situés aux coins du cadre, et par quatre tiges télescopiques (29) qui relient lesdits ensembles de récupération (23 à 26) et représentent les côtés du cadre,
    - des rouleaux d'alimentation (B1, B2, B3) sont disposés dans une station de sélection S1, lesquels rouleaux sont capables de tirer vers le haut ledit film en forme de sac, d'ouvrir le bord supérieur de celui-ci et de l'adapter sur ledit cadre à élargissement réglable (13), en dehors desdits ensembles de récupération (23 à 26) et desdites tiges télescopiques (29),
    - chacun desdits quatre ensembles de récupération (23 à 26) comprend un moyen (30, 32, 37 ; 40, 41, 43) destiné à provoquer le fronçage dudit film (P) avec un mouvement ascendant, au cours de l'étape de chargement du film sur le cadre (13), et un moyen (30, 32, 37 ; 40, 41, 43) destiné à guider ledit film et/ou destiné à le freiner au cours de l'étape de libération sur la charge (C), lors de la course dudit coulissement vers le bas du cadre à élargissement réglable (13) le long de la charge,
    - lesdites tiges télescopiques (29) pouvant coopérer avec ledit moyen de guidage (30, 32, 37 ; 40, 41, 43) des ensembles de récupération, pour guider le film (P) afin de le retourner au cours de l'étape de libération sur la charge (C).
  11. Dispositif de suremballage selon la revendication 10, caractérisé en ce que lesdits quatre ensembles de récupération et de fronçage (23, 24, 25, 26) sont installés pour être mutuellement mobiles sur un plan horizontal, à la fois dans une direction transversale (X-X) et dans une direction longitudinale (Y-Y), sur un chariot de transfert (14) présentant une structure de boîte rigide.
  12. Dispositif de suremballage selon la revendication 11, caractérisé en ce que lesdits quatre ensembles de récupération et de fronçage de film (23, 24, 25, 26) sont installés chacun sur des moyens de guidage et de coulissement respectifs (17, 18, 19, 20, 23a, 24a, 25a, 26a).
  13. Dispositif de suremballage selon la revendication 12, caractérisé en ce que lesdits moyens de guidage et de coulissement comprennent deux paires de premiers sabots (17, 17 ; 18, 18), pouvant coulisser le long de deux côtés opposés dudit chariot de transfert (14) présentant une structure en forme de boîte, et deux éléments transversaux de support parallèles (19, 20), dont chacun est installé en ayant ses extrémités solidaires d'une paire desdits premiers sabots, et en ce que lesdites paires de sabots et d'éléments transversaux (17, 17, 19 ; 18, 18, 20) sont mutuellement mobiles de manière symétrique de façon spéculaire par rapport à un premier axe médian (Y1-Y1) dudit chariot (14) comportant une structure en forme de boîte.
  14. Dispositif de suremballage selon la revendication 12 ou 13, caractérisé en ce que ledit moyen de guidage et de coulissement comprend, en outre, deux paires de seconds sabots (23a, 26a ; 24a, 25a), les sabots de chaque paire étant mutuellement mobiles de manière symétrique de façon spéculaire par rapport à un second axe médian (X-X) de ladite structure en forme de boîte (14), ledit second axe étant perpendiculaire au premier.
  15. Dispositif de suremballage selon les revendications 13 et 14, caractérisé en ce que chacun desdits seconds sabots (23a, 24a, 25a, 26a) supporte un desdits quatre ensembles de récupération de film (23, 24, 25, 26), lesdits sabots étant installés par paires chacun sur un élément respectif parmi lesdits éléments transversaux (19 ; 20) pouvant coulisser dans des directions opposées.
  16. Dispositif de suremballage selon les revendications 13, 14 ou 15, caractérisé en ce que lesdites paires de sabots (23a, 24a, 25a, 26a) et/ou les éléments transversaux (17, 19 ; 18, 20) peuvent coulisser sous la commande d'un seul moteur (21) fonctionnant par l'intermédiaire d'un moyen d'entraînement, agissant dans des directions opposées.
  17. Dispositif de suremballage selon les revendications 13, 14 ou 15, caractérisé en ce que lesdites paires de sabots (23a, 24a, 25a, 26a) peuvent coulisser sous la commande de deux moteurs respectifs (27, 28), fonctionnant par l'intermédiaire d'un moyen d'entraînement agissant dans des directions opposées.
  18. Dispositif de suremballage selon la revendication 16 ou 17, caractérisé en ce que ledit moyen d'entraînement agissant dans des directions opposées est constitué de chaînes (22) défilant chacune le long d'un trajet circulaire, un sabot sur deux (17, 18 ; 23a à 24a, 25a à 26a) mobile dans des directions opposées étant relié à une branche de chaîne et à la branche opposée de la même chaîne, respectivement.
  19. Dispositif de suremballage selon la revendication 10, caractérisé en ce que chacun desdits quatre ensembles de récupération de film et de fronçage de film (23, 24, 25, 26) forme un élément angulaire dudit cadre à élargissement réglable (13) et comprend, en tant que moyen de guidage de film et/ou de freinage de film, au moins une roue de transport (32, 40) agencée sur l'extérieur et sensiblement selon la bissectrice de l'élément angulaire, et dont la surface repose sur un guide de fronçage opposé (30, 36 ; 41, 42) au niveau d'un point de préhension du film et au niveau d'un point de tirage du film (TR) du film (P).
  20. Dispositif de suremballage selon la revendication 19, caractérisé en ce que ladite roue de transport (40) est entraînée par un moteur et ledit guide de fronçage consiste en un ensemble d'une barre de section de guidage (42) et d'un bloc de coulissement (41) associé au fond de ladite barre de section (42).
  21. Dispositif de suremballage selon la revendication 19, caractérisé en ce que ladite roue de transport (32) tourne à vide et ledit guide de fronçage est formé par l'ensemble d'une barre de section de guidage (36) et d'une paire de roues entraînées par un moteur (30), disposées à 90° et mutuellement positionnées de sorte que leur contour établit sensiblement un contact mutuel au niveau dudit point de préhension (TR) du film (P).
  22. Dispositif de suremballage selon la revendication 10, caractérisé en ce que lesdites tiges télescopiques (29) sont tubulaires, en présentant une section circulaire.
  23. Dispositif de suremballage selon la revendication 10, caractérisé en ce que
    - ladite structure de support principale (1, 2, 3) forme un ensemble unitaire adjacent au moyen (T) destiné à transporter la charge (C) et
    - ledit cadre à élargissement réglable (13) comportant ses moyens respectifs (23, 24, 25, 26) destinés à récupérer et à froncer le film (P) sur le cadre (13) lui-même, est installé avec possibilité de déplacement entre une position à l'intérieur de la structure de support principale, prévue pour la préparation du sac de film froncé, et une position à l'extérieur de ladite structure de support principale et au-dessus de la charge (C) devant être emballée,
    - ledit cadre à élargissement réglable étant, en outre, mobile verticalement de manière à appliquer ledit sac de film (P) sur la charge (C).
  24. Dispositif selon les revendications 10 ou 23, caractérisé en ce que ledit cadre à élargissement réglable (13) est installé sur un chariot de transfert (14), d'une structure en forme de boîte rigide, pouvant être déplacé le long d'un plan horizontal entre ladite position prévue pour la préparation du sac de film froncé et ladite position au-dessus de la charge (C).
  25. Dispositif selon la revendication 10, caractérisé en ce que lesdits moyens (7, 7a, 7b) de découpage et de thermosoudage sont installés sur un support fixe, situé au fond de ladite structure de support principale (1, 2, 3), et ils comprennent une paire de sabots, pouvant se déplacer l'un vers l'autre, et portant chacun une lame de découpe (7b) et un dispositif de pression pour le soudage (7a), s'étendant le long de toute la largeur du film tubulaire (P).
  26. Dispositif de suremballage selon la revendication 25, caractérisé en ce que chaque dispositif de pression pour le soudage (7a) est associé à un dispositif de pression pour le refroidissement (7e) s'étendant également le long de toute la largeur du film tubulaire (P).
  27. Dispositif de suremballage selon la revendication 26, caractérisé en ce que ledit dispositif de pression pour le refroidissement (7e) est constitué d'une barre tubulaire, à l'intérieur de laquelle de l'air ou un liquide de refroidissement s'écoule.
  28. Dispositif de suremballage selon la revendication 25, caractérisé en ce que chacun desdits sabots est actionné par un vérin pneumatique respectif (7c).
  29. Dispositif de suremballage selon la revendication 10, caractérisé en ce que ledit moyen d'alimentation vers le haut dudit film tubulaire comprend un chariot à poutrelle (8), glissant le long de deux montants (1a, 1b) de ladite structure de support principale (1, 2, 3) entraînée par un moyen de moteur respectif (8a).
  30. Dispositif de suremballage selon la revendication 29, caractérisé en ce que ledit chariot à poutrelle (8) présente un axe parallèle à l'axe médian longitudinal Y-Y de la structure de support principale (1, 2, 3).
  31. Dispositif de suremballage selon les revendications 29 ou 30, caractérisé en ce que deux bras de support (9a, 9b) du moyen (11, 12) destiné à saisir le film tubulaire (P) sont associés audit chariot à poutrelle (8), lesdits bras (9a, 9b) étant montés en porte-à-faux sur deux sabots respectifs, mobiles l'un vers l'autre sur ledit chariot à poutrelle (8), de manière symétrique spéculaire par rapport à un axe médian transversal X-X du dispositif.
  32. Dispositif de suremballage selon la revendication 31, caractérisé en ce que ledit moyen de préhension du film est constitué de deux paires de pinces (11, 12), dont les pinces de chaque paire sont installées pour être mobiles sur un bras de support respectif (9a, 9b), lesdites pinces se rapprochant ou s'écartant l'une de l'autre de manière symétrique spéculaire par rapport audit axe médian longitudinal Y-Y de la structure de support principale.
  33. Dispositif de suremballage selon la revendication 10, caractérisé en ce qu'il comprend une station de sélection et d'alimentation du film tubulaire (S1), située au niveau de la partie inférieure de ladite structure de support principale (1, 2, 3).
EP04103938A 2003-08-28 2004-08-17 Procédé et appareil pour le suremballage scellé d' une charge avec un film tubulaire en matériau plastique étirable. Active EP1510460B1 (fr)

Applications Claiming Priority (2)

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IT001674A ITMI20031674A1 (it) 2003-08-28 2003-08-28 Procedimento ed apparecchiatura per realizzare un
ITMI20031674 2003-08-28

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EP1510460A1 EP1510460A1 (fr) 2005-03-02
EP1510460B1 true EP1510460B1 (fr) 2006-12-27

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EP (1) EP1510460B1 (fr)
AT (1) ATE349378T1 (fr)
DE (1) DE602004003869T2 (fr)
DK (1) DK1510460T3 (fr)
ES (1) ES2278279T3 (fr)
IT (1) ITMI20031674A1 (fr)
PT (1) PT1510460E (fr)

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ITMI20060080U1 (it) * 2006-03-06 2007-09-07 Sestese Off Mec Perfezionamenti ad una struttura di divaricazione di un'apparecchiatura di imballaggio incappucciatrice.
ITMI20121689A1 (it) * 2012-10-09 2014-04-10 Sestese Off Mec Macchina d'imballaggio incappucciatrice perfezionata, con cambio automatico delle bobine.
ITMI20121690A1 (it) 2012-10-09 2014-04-10 Sestese Off Mec Macchina d'imballaggio incappucciatrice perfezionata, con regolazione in altezza del dispositivo di distribuzione.
DK2993134T3 (en) 2014-09-05 2017-05-01 Officina Mecc Sestese S P A coating device
IT201600127868A1 (it) * 2016-12-19 2018-06-19 Messersi Packaging Srl Macchina incappucciatrice con struttura perfezionata
CN106891537B (zh) * 2017-04-21 2023-04-25 山东新华医疗器械股份有限公司 一种铝膜焊接机

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DE3908957C2 (de) * 1989-03-18 1996-12-12 Beumer Maschf Bernhard Verfahren und Vorrichtung zum Umhüllen von Stückgut mit Dehnfolie (Stretchfolie)
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
IT1313378B1 (it) * 1999-09-23 2002-07-23 Sestese Off Mec Apparecchiatura incappucciatrice combinata
EP1106507A1 (fr) * 1999-12-09 2001-06-13 Effe 3 Tl Srl Proçédé et dispositif pour appliquer une housse sur un objet
US6381929B1 (en) * 2000-03-14 2002-05-07 Tien Heng Machinery Co., Ltd. Automatic bagging machine using cool-shrinking film

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DE602004003869T2 (de) 2007-07-05
ITMI20031674A1 (it) 2005-02-28
DK1510460T3 (da) 2007-05-07
EP1510460A1 (fr) 2005-03-02
PT1510460E (pt) 2007-03-30
ATE349378T1 (de) 2007-01-15
DE602004003869D1 (de) 2007-02-08
ES2278279T3 (es) 2007-08-01

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