EP0144266A2 - Device for wrapping a load with a stretchable plastic film - Google Patents

Device for wrapping a load with a stretchable plastic film Download PDF

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Publication number
EP0144266A2
EP0144266A2 EP84402428A EP84402428A EP0144266A2 EP 0144266 A2 EP0144266 A2 EP 0144266A2 EP 84402428 A EP84402428 A EP 84402428A EP 84402428 A EP84402428 A EP 84402428A EP 0144266 A2 EP0144266 A2 EP 0144266A2
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EP
European Patent Office
Prior art keywords
film
load
wrapping
envelope
sheet
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.)
Granted
Application number
EP84402428A
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German (de)
French (fr)
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EP0144266B1 (en
EP0144266A3 (en
Inventor
Jean-Philippe Begnatborde
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.)
Emco International Dite Ste
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Emco International Dite Ste
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Publication date
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Priority to AT84402428T priority Critical patent/ATE29448T1/en
Publication of EP0144266A2 publication Critical patent/EP0144266A2/en
Publication of EP0144266A3 publication Critical patent/EP0144266A3/en
Application granted granted Critical
Publication of EP0144266B1 publication Critical patent/EP0144266B1/en
Expired 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
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/026—Enclosing successive articles, or quantities of material between opposed webs the webs forming a curtain
    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
    • B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles

Definitions

  • the present invention relates to a method and a device for wrapping a load with a film of stretchable plastic.
  • US Patent 4,589,091 already describes a method and a device in which the stretchable plastic film is subjected, before its use, to a pre-stretching by passing it successively through two pairs of rollers tangent to each other , the second pair of rollers, located downstream in the direction of travel of the film, being rotated at a peripheral speed greater than that of the rollers of the first pair located upstream.
  • the film thus pre-stretched is then driven in the same direction as the load to be packaged, at a speed equal to that of the displacement of the load. It is also provided, in this patent, to weld and cut the film between two consecutive packed loads.
  • Such a method has the disadvantage that the end of the film is trapped, after pre-stretching, by fingers or sealing bars, which means that the machine must be continuously supplied with loads or products, under penalty of continuously forming film strips, even if there is no product to be wrapped.
  • the relationship between the perimeter of the product to be packaged and the quantity of film delivered is frozen, because the entrainment of the film is linked to the entrafnage of the product by mechanical connection, and the two entrainments are done at the same speed.
  • the machine according to US Pat. No. 3,589,091 is therefore linked to a specific type of product.
  • the welding must always be done in the middle of the width of the load or of the product to be packaged.
  • the disadvantage of such a method is that it limits the use of films, since the film is systematically stretched at a rate higher than that at which this film will be used, and does not take account of the particular shape of the products or fillers to be packaged, which are most often rectangular: for example, the angles of the pallets and the corners or edges of the bundles are not taken into account.
  • the present invention aims to remedy these drawbacks by providing a particularly simple design method and installation, making it possible to control the quantity of film delivered to the quantity of film that is needed to be used, for each load, so to deliver only the quantity of film actually necessary for packaging the load to be packaged, this control being done without any interaction on the percentage of stretching of the film, which is completely independent.
  • this process making it possible to wrap a load with a film of plastic stretchable material, in which the film is subjected, before wrapping the load, to a pre-stretching, is characterized in that the quantity of film used has been measured at all times since the start of the operation of wrapping to constitute the envelope of the load, this quantity of film actually used is compared to the quantity of pre-stretched film which is delivered, and corrected, as the wrapping operation of the load, the quantity of pre-stretched film delivered so that it remains equal to the quantity of film used to constitute the envelope of the load.
  • the process according to the invention can be implemented effectively, either by direct measurement of the film footage used at each instant, from the start of the packaging operation, to constitute the envelope of the load, and by comparison of this footage with the footage of film cut during the same time interval, either by measuring the difference in footage between the film used and the film cut, or again by measuring and comparing the speeds of use and the throughput of the pre-stretched film .
  • the invention also relates to an installation for wrapping a load with a plastic stretch film, comprising at least one reel of stretch film and at least one stretching device disposed between this reel and the load to be wrapped, characterized in that it comprises means for measuring, at each instant, the quantity of film used to constitute the envelope of the load, and means for comparing this quantity of film actually used with the quantity of pre-stretched film which is delivered, the output of these comparison means being connected to a device for controlling the supply of the drive motor or motors of each stretching device, so as to correct, as the operation progresses envelop the load, the quantity of pre-stretched film delivered, so that it remains equal to the quantity of film used to constitute the envelope of the load.
  • the installation shown diagrammatically in FIG. 1 is intended to wrap a load 1, such as a load on a pallet or any other burden, by means of a film of stretchable plastic material 2, delivered from a reel 3, horizontal or vertical axis.
  • the load 1 is wrapped by rotating the latter around an axis 4 parallel to that of the coil 3, that is to say horizontal or vertical.
  • the film delivered from the reel 3 passes through a pre-stretching device 5, of any known type, which consists of two pairs of tangent rollers between which the film passes, namely, a first pair of upstream rollers 6, and a second pair of downstream rollers 7, respectively driven in rotation by motors 8 and 9.
  • the speed of rotation of the downstream rollers 7, entrained by the motor 9, is chosen to be higher than that of the upstream rollers 6 entrained by the motor 8, so as to stretch the film longitudinally.
  • the rate of stretching of the film, which leaves the pre-stretching device 5 at speed V, therefore depends on the ratio of the speeds of rotation of the motors 8 and 9.
  • the film 2 which moves at speed V, passes over a film accumulation device 11, of any known type, constituted for example by an articulated puppet, or else by a roller sets.
  • the film 2 then passes over a deflection roller 12, of fixed position, from which it is deflected in the direction of the lateral surface of the load 1, on which it is applied at a speed of use V 2 .
  • the method and the installation according to the invention use speed sensors 13 and 14 which are associated, respectively, with the downstream stretching rollers 7 and the deflection roller 12, for measuring by speed V 1 the flow rate of the stretched film , and, on the other hand, the speed V 2 of use of the film, the latter varying in particular according to the shape of the charges to be packaged.
  • the speed sensors 13, 14 deliver, at their output, analog or digital signals representing respectively the speeds V and V 2 , and these signals are applied to the two inputs of a comparator 15, the output of which is connected to devices d 'supply of the respective drive motors 8 and 9.
  • the control loop thus formed makes it possible to control the speed V of the flow of the stretched film to the effective speed of use V.
  • the comparator 15 detects any difference, positive or negative, between the speeds V and V 2 , and this comparator then emits, at its output, a corresponding error signal, which is applied so as to vary the speed of rotation of the motor 8, 9 in the appropriate direction to always maintain an equal relationship between the two speeds V and V 2 .
  • Figure 2 illustrates an installation using two film reels 16, 17 with horizontal axes, as shown in Figure 2, or vertical.
  • the films 18, 19, unwound from the respective reels 16, 17, are previously stretched in devices 21, 22, of any known type, for example similar to device 5 in FIG. 1, the ratio of the rotational speeds of the rollers defining the draw rate.
  • the two stretching devices 21, 22 are coupled together, so as to obtain, on each of the elementary films 18, 19, a identical stretching rate and identical speed of film flow rate. This coupling can be carried out either mechanically, electrically or hydraulically.
  • the two elementary films also pass over respective upper 24 and lower 25 return rollers, and they are welded to each other, along a transverse weld bead 26, so as to form a vertical curtain. This welding is carried out by two welding jaws 27, 28, movable vertically.
  • Each product to be packaged 29, being on a horizontal conveyor 31, is situated on one side of the film curtain which extends vertically, in this case to the left of this curtain, in FIG. 2.
  • the products to be packaged for example, loads on a pallet are introduced horizontally into the vertical curtain formed by the two films 18, 19, by a mechanized pusher 32, at constant speed.
  • the load to be packaged 29, on entering the film curtain, during its movement to the right, uses, for its packaging, a quantity of film defined by its own perimeter.
  • On the other side of the film curtain is another horizontal conveyor 33, located in the same horizontal plane as the conveyor 31, and above which is located a holding presser 34 with vertical movement.
  • the load 29 After entering the vertical curtain formed by the films 18, 19, the load 29 passes over the conveyor 33, located to the right of the curtain, and stops downstream of the welding jaws 27, 28, under the holding presser 34 This presser 34 is then lowered, to immobilize the load and prevent it from rolling back. Then, the welding jaws 27, 28, which come from each other, are brought together vertically. pinch together and seal the two elementary films on themselves, to form a posterior weld bead 26a, opposite the anterior weld bead 26.
  • speed sensors 13 and 14 respectively measure the speed V 1 of the flow of the stretched film and the speed V of use of the film, these two sensors being connected, as in the case of FIG. 1, to the two inputs of a comparator 15, the output of which controls the speed of rotation of a motor 35, driving the two stretching devices 21, 22.
  • sensors 13, 14 are used which measure the speeds V 1 , V 2 , other sensors could also be used, either the quantity of film used in a given time, or again the difference in footage between the film used and the film debited.

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

Abstract

1. Installation enabling a load to be wrapped with a sheet of predrawn plastic material, by regulating the quantity of sheet supplied to the quantity of sheet required for the wrapping of the load, which installation comprises at least one reel of drawable sheet and at least one drawing device (5, 21, 22), disposed between said reel and the load to be wrapped, characterized in that the installation comprises means (13, 14) for measuring, at each instant, the quantity of predrawn sheet used for making up the envelope of the load and the quantity of predrawn sheet supplied at the outlet from the drawing device, and means (15) for comparing this quantity of sheet actually used with the quantity of predrawn sheet which is supplied, the outlet from these comparison means (15) being connected to a device for controlling the supply of the motor or motors (8, 9; 35) for driving each drawing device, in such a manner as to correct, progressively as the operation of wrapping the load (1) proceeds, the quantity of predrawn sheet supplied so that it remains equal to the quantity of sheet used for making up the envelope of the load, without intervention upon the drawing of the sheet.

Description

La présente invention concerne un procédé et un dispositif permettant d'envelopper une charge avec un film de matière plastique étirable.The present invention relates to a method and a device for wrapping a load with a film of stretchable plastic.

Le brevet US 4 589 091 décrit déjà un procédé et un dispositif dans lesquels on soumet le film de matière plastique étirable, avant son utilisation, à un préétirage en le faisant passer successivement à travers deux paires de rouleaux tangents l'un à l'autre, la seconde paire de rouleaux, située en aval dans le sens du défilement du film, étant entraînée en rotation à une vitesse périphérique supérieure à celle des rouleaux de la première paire située en amont. Le film ainsi préétiré est ensuite entraîné dans la même direction que la charge à emballer, à une vitesse égale à celle du déplacement de la charge. Il est également prévu, dans ce brevet, de souder et de couper le film entre deux charges emballées consécutives.US Patent 4,589,091 already describes a method and a device in which the stretchable plastic film is subjected, before its use, to a pre-stretching by passing it successively through two pairs of rollers tangent to each other , the second pair of rollers, located downstream in the direction of travel of the film, being rotated at a peripheral speed greater than that of the rollers of the first pair located upstream. The film thus pre-stretched is then driven in the same direction as the load to be packaged, at a speed equal to that of the displacement of the load. It is also provided, in this patent, to weld and cut the film between two consecutive packed loads.

Un tel procédé présente l'inconvénient que l'extrémité du film est en- trafnée, après le préétirage, par des doigts ou des barres de soudage, ce qui oblige à alimenter sans interruption la machine en charges ou produits, sous peine de former continuellement des bandeaux de film, même s'il n'y a pas de produit à emballer. De plus, le rapport entre le périmètre du produit à emballer et la quantité de film débité est figé, car l'entrafnement du film est lié à l'entrafnement du produit par liaison mécanique, et les deux entrafnements se font à la même vitesse. La machine suivant le brevet US 3 589 091 est donc liée à un type de produit bien déterminé. Enfin, par suite de ce procédé, la soudure doit toujours se faire au milieu de la largeur de la charge ou du produit à emballer.Such a method has the disadvantage that the end of the film is trapped, after pre-stretching, by fingers or sealing bars, which means that the machine must be continuously supplied with loads or products, under penalty of continuously forming film strips, even if there is no product to be wrapped. In addition, the relationship between the perimeter of the product to be packaged and the quantity of film delivered is frozen, because the entrainment of the film is linked to the entrafnage of the product by mechanical connection, and the two entrainments are done at the same speed. The machine according to US Pat. No. 3,589,091 is therefore linked to a specific type of product. Finally, as a result of this process, the welding must always be done in the middle of the width of the load or of the product to be packaged.

On connaft également, ainsi qu'il est décrit dans le brevet FR 2 281 275, un procédé et un dispositif permettant d'envelopper une charge avec un film préalablement étiré, par l'intermédiaire de deux paires de rouleaux tournant à des vitesses différentes. Dans ce procédé, soit on tire le film à une vitesse inférieure ou égale à la vitesse de sortie du dispositif étireur, soit on déplace la charge à une vitesse inférieure ou égale à la vitesse du film à la sortie du dispositif étireur.We also know, as described in patent FR 2 281 275, a method and a device for wrapping a load with a previously stretched film, by means of two pairs of rollers rotating at different speeds. In this method, either the film is drawn at a speed less than or equal to the speed of exit from the stretching device, or the load is moved at a speed less than or equal to the speed of the film at the exit from the stretching device.

Un tel procédé a pour inconvénient de limiter l'utilisation des films, car on étire systématiquement le film à un taux supérieur à celui auquel ce film sera utilisé, et de ne pas tenir compte de la forme particulière des produits ou charges à emballer, qui sont le plus souvent rectangulaires : par exemple, on ne tient pas compte des angles des palettes et des coins ou arêtes des fardeaux.The disadvantage of such a method is that it limits the use of films, since the film is systematically stretched at a rate higher than that at which this film will be used, and does not take account of the particular shape of the products or fillers to be packaged, which are most often rectangular: for example, the angles of the pallets and the corners or edges of the bundles are not taken into account.

La présente invention vise à remédier à ces inconvénients en procurant un procédé et une installation de conception particulièrement simple, permettant d'asservir la quantité de film débitée à la quantité de film qu'on a besoin d'utiliser, pour chaque charge, de manière à ne délivrer que la quantité de film réellement nécessaire à l'emballage de la charge à emballer, cet asservissement se faisant sans aucune interaction sur le pourcentage d'étirage du film, qui est totalement indépendant.The present invention aims to remedy these drawbacks by providing a particularly simple design method and installation, making it possible to control the quantity of film delivered to the quantity of film that is needed to be used, for each load, so to deliver only the quantity of film actually necessary for packaging the load to be packaged, this control being done without any interaction on the percentage of stretching of the film, which is completely independent.

A cet effet, ce procédé, permettant d'envelopper une charge avec un film de matière plastique étirable, dans lequel on soumet le film, avant d'envelopper la charge, à un préétirage, est caractérisé en ce que l'on mesure à chaque instant la quantité de film utilisée depuis le début de l'opération d'enveloppement pour constituer l'enveloppe de la charge, on compare cette quantité de film réellement utilisée à la quantité de film préétirée qui est débitée, et on corrige, au fur et à mesure de l'avancement de l'opération d'enveloppement de la charge, la quantité de film préétirée débitée pour qu'elle reste égale à la quantité de film utilisée pour constituer l'enveloppe de la charge.To this end, this process, making it possible to wrap a load with a film of plastic stretchable material, in which the film is subjected, before wrapping the load, to a pre-stretching, is characterized in that the quantity of film used has been measured at all times since the start of the operation of wrapping to constitute the envelope of the load, this quantity of film actually used is compared to the quantity of pre-stretched film which is delivered, and corrected, as the wrapping operation of the load, the quantity of pre-stretched film delivered so that it remains equal to the quantity of film used to constitute the envelope of the load.

Le procédé suivant l'invention peut être mis en oeuvre effectivement, soit par mesure directe du métrage de film utilisé à chaque instant, à partir du début de l'opération d'emballage, pour constituer l'enveloppe de la charge, et par comparaison de ce métrage avec le métrage de film débité pendant le même intervalle de temps, soit par mesure de la différence de métrage entre le film utilisé et le film débité, soit encore par mesure et comparaison des vitesses d'utilisation et de débit du film préétiré.The process according to the invention can be implemented effectively, either by direct measurement of the film footage used at each instant, from the start of the packaging operation, to constitute the envelope of the load, and by comparison of this footage with the footage of film cut during the same time interval, either by measuring the difference in footage between the film used and the film cut, or again by measuring and comparing the speeds of use and the throughput of the pre-stretched film .

L'invention a également pour objet une installation permettant d'envelopper une charge avec un film de matière plastique étirable, comportant au moins une bobine de film étirable et au moins un dispositif d'étirage disposé entre cette bobine et la charge à envelopper, caractérisée en ce qu'elle comporte des moyens pour mesurer, à chaque instant, la quantité de film utilisée pour constituer l'enveloppe de la charge, et des moyens pour comparer cette quantité de film réellement utilisée à la quantité de film préétiré qui est débitée, la sortie de ces moyens de comparaison étant connectée à un dispositif de commande de l'alimentation du ou des moteurs d'entraînement de chaque dispositif d'étirage, de manière à corriger, au fur et à mesure de l'avancement de l'opération d'enveloppent de la charge, la quantité de film préétiré débitée, pour qu'elle reste égale à la quantité de film utilisée pour constituer l'enveloppe de la charge.The invention also relates to an installation for wrapping a load with a plastic stretch film, comprising at least one reel of stretch film and at least one stretching device disposed between this reel and the load to be wrapped, characterized in that it comprises means for measuring, at each instant, the quantity of film used to constitute the envelope of the load, and means for comparing this quantity of film actually used with the quantity of pre-stretched film which is delivered, the output of these comparison means being connected to a device for controlling the supply of the drive motor or motors of each stretching device, so as to correct, as the operation progresses envelop the load, the quantity of pre-stretched film delivered, so that it remains equal to the quantity of film used to constitute the envelope of the load.

On décrira ci-après, à titre d'exemples non limitatifs, diverses formes d'exécution de la présente invention, en référence au dessin annexé, sur lequel :

  • - la Figure 1 est un schéma synoptique d'une installation d'emballage mettant en oeuvre le procédé suivant l'invention et utilisant une seule bobine de film ;
  • - la Figure 2 est un schéma synoptique d'une variante d'exécution d'une installation utilisant deux bobines de film.
Various embodiments of the present invention will be described below, by way of non-limiting examples, with reference to the appended drawing, in which:
  • - Figure 1 is a block diagram of a packaging installation implementing the method according to the invention and using a single film reel;
  • - Figure 2 is a block diagram of an alternative embodiment of an installation using two reels of film.

L'installation représentée schématiquement sur la Figure 1 est destinée à envelopper une charge 1, telle qu'une charge sur palette ou tout autre fardeau, au moyen d'un film de matière plastique étirable 2, débité à partir d'une bobine 3, d'axe horizontal ou vertical. L'enveloppement de la charge 1 s'effectue en faisant tourner cette dernière autour d'un axe 4 parallèle à celui de la bobine 3, c'est-à-dire horizontal ou vertical. Le film débité à partir de la bobine 3 passe à travers un dispositif de préétirage 5, de tout type connu, lequel est constitué de deux paires de rouleaux tangents entre lesquels passe le film, à savoir, une première paire de rouleaux amont 6, et une seconde paire de rouleaux aval 7, respectivement entraînés en rotation par des moteurs 8 et 9. La vitesse de rotation des rouleaux aval 7, entrafnés par le moteur 9, est choisie supérieure à celle des rouleaux amont 6 entrafnés par le moteur 8, de manière à étirer longitudinale - ment le film. Le taux d'étirage du film,qui sort du dispositif de préétirage 5 à la vitesse V , dépend donc du rapport des vitesses de rotation des moteurs 8 et 9.The installation shown diagrammatically in FIG. 1 is intended to wrap a load 1, such as a load on a pallet or any other burden, by means of a film of stretchable plastic material 2, delivered from a reel 3, horizontal or vertical axis. The load 1 is wrapped by rotating the latter around an axis 4 parallel to that of the coil 3, that is to say horizontal or vertical. The film delivered from the reel 3 passes through a pre-stretching device 5, of any known type, which consists of two pairs of tangent rollers between which the film passes, namely, a first pair of upstream rollers 6, and a second pair of downstream rollers 7, respectively driven in rotation by motors 8 and 9. The speed of rotation of the downstream rollers 7, entrained by the motor 9, is chosen to be higher than that of the upstream rollers 6 entrained by the motor 8, so as to stretch the film longitudinally. The rate of stretching of the film, which leaves the pre-stretching device 5 at speed V, therefore depends on the ratio of the speeds of rotation of the motors 8 and 9.

Une fois ce préétirage effectué, le film 2, qui se déplace à la vitesse V , passe sur un dispositif d'accumulation de film 11, de tout type connu, constitué par exemple par un pantin articulé, ou bien par un jeux de rouleaux. Le film 2 passe ensuite sur un rouleau de renvoi 12, de position fixe, à partir duquel il est dévié en direction de la surface latérale de la charge 1, sur laquelle il est appliqué à une vitesse d'utilisation V2.Once this pre-stretching has been carried out, the film 2, which moves at speed V, passes over a film accumulation device 11, of any known type, constituted for example by an articulated puppet, or else by a roller sets. The film 2 then passes over a deflection roller 12, of fixed position, from which it is deflected in the direction of the lateral surface of the load 1, on which it is applied at a speed of use V 2 .

Le procédé et l'installation suivant l'invention mettent en oeuvre des capteurs de vitesse 13 et 14 qui sont associés, respectivement, aux rouleaux étireurs aval 7 et au rouleau de renvoi 12, pour mesurer par la vitesse V1 de débit du film étiré, et, d'autre part, la vitesse V 2 d'utilisation du film, cette dernière variant notamment suivant la forme des charges à emballer. Les capteurs de vitesse 13, 14 délivrent, à leur sortie, des signaux analogiques ou numériques représentant respectivement les vitesses V et V2, et ces signaux sont appliqués aux deux entrées d'un comparateur 15, dont la sortie est connectée à des dispositifs d'alimentation des moteurs d'entraînement respectifs 8 et 9. La boucle de régulation ainsi constituée permet d'asservir la vitesse V de débit du film étiré à la vitesse d'utilisation effective V . En effet, le comparateur 15 détecte toute différence, positive ou négative, entre les vitesses V et V2, et ce comparateur émet alors, à sa sortie, un signal d'erreur correspondant, qui est appliqué de manière à faire varier la vitesse de rotation du moteur 8, 9 dans le sens approprié pour maintenir toujours une relation d'égalité entre les deux vitesses V et V2.The method and the installation according to the invention use speed sensors 13 and 14 which are associated, respectively, with the downstream stretching rollers 7 and the deflection roller 12, for measuring by speed V 1 the flow rate of the stretched film , and, on the other hand, the speed V 2 of use of the film, the latter varying in particular according to the shape of the charges to be packaged. The speed sensors 13, 14 deliver, at their output, analog or digital signals representing respectively the speeds V and V 2 , and these signals are applied to the two inputs of a comparator 15, the output of which is connected to devices d 'supply of the respective drive motors 8 and 9. The control loop thus formed makes it possible to control the speed V of the flow of the stretched film to the effective speed of use V. Indeed, the comparator 15 detects any difference, positive or negative, between the speeds V and V 2 , and this comparator then emits, at its output, a corresponding error signal, which is applied so as to vary the speed of rotation of the motor 8, 9 in the appropriate direction to always maintain an equal relationship between the two speeds V and V 2 .

La Figure 2 illustre une installation utilisant deux bobines de film 16, 17 d'axes horizontaux, comme il est représenté sur la Figure 2, ou verticaux. Les films 18, 19, dévidés à partir des bobines respectives 16, 17, sont préalablement étirés dans des dispositifs 21, 22, de tout type connu, par exemple semblables au dispositif 5 de la Figure 1, le rapport des vitesses de rotation des rouleaux définissant le taux d'étirage. Les deux dispositifs d'étirage 21, 22 sont couplés ensemble, de manière à obtenir, sur chacun des films élémentaires 18, 19, un taux d'étirage identique et une vitesse V de débit de film identique. Ce couplage peut être réalisé soit mécaniquement, soit électriquement, soit hydrauliquement.Figure 2 illustrates an installation using two film reels 16, 17 with horizontal axes, as shown in Figure 2, or vertical. The films 18, 19, unwound from the respective reels 16, 17, are previously stretched in devices 21, 22, of any known type, for example similar to device 5 in FIG. 1, the ratio of the rotational speeds of the rollers defining the draw rate. The two stretching devices 21, 22 are coupled together, so as to obtain, on each of the elementary films 18, 19, a identical stretching rate and identical speed of film flow rate. This coupling can be carried out either mechanically, electrically or hydraulically.

L'un des films élémentaires 18, 19, en l'occurrence le brin de film supérieur 18, dans l'exemple représenté sur la Figure 2, passe dans un dispositif d'accumulation connu 23 (par exemple, un rouleau fou, servant de pantin). Les deux films élémentaires passent également sur des rouleaux de renvoi respectifs supérieur 24 et inférieur 25, et ils sont soudés l'un à l'autre, le long d'un cordon de soudure transversal 26, de manière à former un rideau vertical. Ce soudage est réalisé par deux mâchoires de soudage 27, 28, mobiles verticalement.One of the elementary films 18, 19, in this case the upper film strand 18, in the example shown in FIG. 2, passes through a known accumulation device 23 (for example, an idler roller, serving as puppet). The two elementary films also pass over respective upper 24 and lower 25 return rollers, and they are welded to each other, along a transverse weld bead 26, so as to form a vertical curtain. This welding is carried out by two welding jaws 27, 28, movable vertically.

Chaque produit à emballer 29, se trouvant sur un transporteur horizontal 31, est situé d'un côté du rideau de film qui s'étend verticalement, en l'occurrence à gauche de ce rideau, sur la Figure 2. Les produits à emballer, par exemple des charges sur palette, sont introduits horizontalement dans le rideau vertical constitué par les deux films 18, 19, par un poussoir mécanisé 32, à vitesse constante. La charge à emballer 29, en pénétrant dans le rideau de film, au cours de son déplacement vers la droite, utilise, pour son emballage, une quantité de film définie par son propre périmètre. De l'autre côté du rideau de film se trouve un autre transporteur horizontal 33, situé dans le même plan horizontal que le transporteur 31, et au-dessus duquel est situé un presseur de maintien 34 à mouvement vertical.Each product to be packaged 29, being on a horizontal conveyor 31, is situated on one side of the film curtain which extends vertically, in this case to the left of this curtain, in FIG. 2. The products to be packaged, for example, loads on a pallet are introduced horizontally into the vertical curtain formed by the two films 18, 19, by a mechanized pusher 32, at constant speed. The load to be packaged 29, on entering the film curtain, during its movement to the right, uses, for its packaging, a quantity of film defined by its own perimeter. On the other side of the film curtain is another horizontal conveyor 33, located in the same horizontal plane as the conveyor 31, and above which is located a holding presser 34 with vertical movement.

Après avoir pénétré dans le rideau vertical formé par les films 18, 19, la charge 29 passe sur le transporteur 33, situé à droite du rideau, et s'arrête en aval des mâchoires de soudage 27, 28, sous le presseur de maintien 34. Ce presseur 34 est alors abaissé, pour immobiliser la charge et éviter qu'elle ne recule. Ensuite, on rapproche verticalement l'une de l'autre les mâchoires de soudage 27, 28, qui viennent pincer entre elles et sceller les deux films élémentaires sur eux- mêmes, pour former un cordon de soudure postérieur 26a, opposé au cordon de soudure antérieur 26.After entering the vertical curtain formed by the films 18, 19, the load 29 passes over the conveyor 33, located to the right of the curtain, and stops downstream of the welding jaws 27, 28, under the holding presser 34 This presser 34 is then lowered, to immobilize the load and prevent it from rolling back. Then, the welding jaws 27, 28, which come from each other, are brought together vertically. pinch together and seal the two elementary films on themselves, to form a posterior weld bead 26a, opposite the anterior weld bead 26.

Suivant l'invention, des capteurs de vitesse 13 et 14 mesurent respectivement la vitesse V1 de débit du film étiré et la vitesse V d'utilisation du film, ces deux capteurs étant connectés, comme dans le cas de la Figure 1, aux deux entrées d'un comparateur 15, dont la sortie commande la vitesse de rotation d'un moteur 35, entraînant les deux dispositifs étireurs 21, 22.According to the invention, speed sensors 13 and 14 respectively measure the speed V 1 of the flow of the stretched film and the speed V of use of the film, these two sensors being connected, as in the case of FIG. 1, to the two inputs of a comparator 15, the output of which controls the speed of rotation of a motor 35, driving the two stretching devices 21, 22.

Bien que, dans les formes d'exécution non limitatives de l'invention qui ont été décrites ci-dessus, on utilise des capteurs 13, 14 mesurant les vitesses V1, V2, on pourrait également utiliser d'autres capteurs mesurant, soit la quantité de film utilisée dans un temps donné, soit encore la différence de métrage entre le film utilisé et le film débité.Although, in the nonlimiting embodiments of the invention which have been described above, sensors 13, 14 are used which measure the speeds V 1 , V 2 , other sensors could also be used, either the quantity of film used in a given time, or again the difference in footage between the film used and the film debited.

Claims (9)

1. Procédé permettant d'envelopper une charge avec un film de matière plastique étirable, dans lequel on soumet le film, avant d'envelopper la charge, à un préétirage, caractérisé en ce que l'on mesure à chaque instant la quantité de film utilisée, depuis le début de l'opération d'enveloppement, pour constituer l'enveloppe de la charge (1), on compare cette quantité de film réellement utilisée à la quantité de film préétirée qui est débitée, et on corrige, au fur et à mesure de l'avancement de l'opération d'enveloppement de la charge (1), la quantité de film préétiré débitée, pour qu'elle reste égale à la quantité de film utilisée pour constituer l'enveloppe de la charge.1. Method for wrapping a filler with a film of stretchable plastic, in which the film is subjected, before wrapping the filler, to a pre-stretch, characterized in that the quantity of film is measured at all times used, since the beginning of the wrapping operation, to constitute the envelope of the load (1), we compare this quantity of film actually used with the quantity of pre-stretched film which is debited, and we correct, as and as the load wrapping operation progresses (1), the quantity of pre-stretched film delivered, so that it remains equal to the quantity of film used to constitute the envelope of the load. 2. Procédé suivant la revendication 1, caractérisé en ce qu'on mesure directement le métrage de film utilisé à chaque instant, à partir du début de l'opération d'enveloppement, pour constituer l'enveloppe de la charge, et on compare ce métrage avec le métrage de film débité pendant le même intervalle de temps.2. Method according to claim 1, characterized in that the film footage used at each instant is directly measured, from the start of the wrapping operation, to constitute the envelope of the load, and this is compared. footage with movie footage output during the same time interval. 3. Procédé suivant la revendication 1, caractérisé en ce qu'on mesure la différence de métrage entre le film utilisé et le film débité.3. Method according to claim 1, characterized in that the difference in footage between the film used and the film debited is measured. 4. Procédé suivant la revendication 1, caractérisé en ce qu'on mesure et compare les vitesses d'utilisation et de débit du film préétiré.4. Method according to claim 1, characterized in that one measures and compares the speeds of use and flow of the pre-stretched film. 5. Installation permettant d'envelopper une charge avec un film de matière plastique étirable, comportant au moins une bobine de film étirable (3, 16, 17) et au moins un dispositif d'étirage (5, 21, 22) disposé entre cette bobine et la charge à envelopper, caractérisée en ce qu'elle comporte des moyens (13, 14) pour mesurer à chaque instant la quantité de film utilisée pour constituer l'enveloppe de la charge, et des moyens (15) pour comparer cette quantité de film réellement utilisée à la quantité de film préétiré qui est débitée, la sortie de ces moyens de comparaison (15) étant connectée à un dispositif de commande de l'alimentation du ou des moteurs (8, 9 ; 35) d'entrafnement de chaque dispositif d'étirage, de manière à corriger, au fur et à mesure de l'avancement de l'opération d'enveloppement de la charge (1), la quantité de film préétiré débitée, pour qu'elle reste égale à la quantité de film utilisée pour constituer l'enveloppe de la charge.5. Installation for wrapping a load with a plastic stretch film, comprising at least one reel of stretch film (3, 16, 17) and at least one stretching device (5, 21, 22) disposed between this reel and the load to be wrapped, characterized in that it comprises means (13, 14) for measuring at any time the quantity of film used to constitute the envelope of the load, and means (15) for comparing this quantity of really useful film related to the quantity of pre-stretched film which is delivered, the output of these comparison means (15) being connected to a device for controlling the supply of the motor or motors (8, 9; 35) entrained by each device d stretching, so as to correct, as the load wrapping operation progresses (1), the quantity of pre-stretched film delivered, so that it remains equal to the quantity of film used to constitute the load envelope. 6. Installation suivant la revendication 5, caractérisée en ce qu'elle comporte, à la sortie du dispositif d'étirage (5, 21), un dispositif d'accumulation de film (11, 23), et au moins un rouleau de renvoi (12, 24, 25), de position fixe, à partir duquel le film est dévié en direction de la charge (1).6. Installation according to claim 5, characterized in that it comprises, at the outlet of the stretching device (5, 21), a film accumulation device (11, 23), and at least one deflection roller (12, 24, 25), of fixed position, from which the film is deflected in the direction of the load (1). 7. Installation suivant l'une quelconque des revendications 5 et 6, caractérisée en ce qu'elle comporte des capteurs de vitesse (13, 14) mesurant respectivement la vitesse V de débit du film, à la sortie du dispositif d'étirage (5, 21), et la vitesse V 2 d'utilisation du film pour l'enveloppement de la charge.7. Installation according to any one of claims 5 and 6, characterized in that it comprises speed sensors (13, 14) measuring respectively the speed V of the film flow rate, at the outlet of the stretching device (5 , 21), and the speed V 2 of use of the film for wrapping the load. 8. Installation suivant l'une quelconque des revendications 5 et 6, caractérisée en ce qu'elle comporte un capteur mesurant la quantité de film utilisée dans un temps donné.8. Installation according to any one of claims 5 and 6, characterized in that it comprises a sensor measuring the amount of film used in a given time. 9. Installation suivant l'une quelconque des revendications 5 et 6, caractérisée en ce qu'elle comporte un capteur mesurant la différence de métrage entre le film utilisé et le film débité, à la sortie du dispositif d'étirage (5, 21).9. Installation according to any one of claims 5 and 6, characterized in that it comprises a sensor measuring the difference in footage between the film used and the film delivered, at the outlet of the stretching device (5, 21) .
EP84402428A 1983-12-01 1984-11-28 Device for wrapping a load with a stretchable plastic film Expired EP0144266B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402428T ATE29448T1 (en) 1983-12-01 1984-11-28 DEVICE FOR WRAPPING A LOAD WITH AN EXTENSIBLE PLASTIC FILM.

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Application Number Priority Date Filing Date Title
FR8319205 1983-12-01
FR8319205A FR2555961B1 (en) 1983-12-01 1983-12-01 METHOD AND DEVICE FOR WRAPPING A LOAD WITH A FILM OF STRETCHABLE PLASTIC MATERIAL

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EP0144266A2 true EP0144266A2 (en) 1985-06-12
EP0144266A3 EP0144266A3 (en) 1985-07-10
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AT (1) ATE29448T1 (en)
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US4840006A (en) * 1981-09-30 1989-06-20 International Packaging Machines, Inc. Stretch wrapping machine
US4866909A (en) * 1985-12-04 1989-09-19 Lantech, Inc. High tensile wrapping process
US5054263A (en) * 1989-01-04 1991-10-08 Insinooritoimisto Pesmel Oy Method and apparatus for wrapping a plastic film around a load
US5301493A (en) * 1992-09-25 1994-04-12 Chen Tsung Yen Steplessly adjustable pre-stretched film wrapping apparatus
FR2712565A1 (en) * 1993-11-19 1995-05-24 Bine Claude Film encapsulation of luggage for security in transit
US20120174533A1 (en) * 2005-04-08 2012-07-12 Lantech.Com, Llc Method and Apparatus For Dispensing An Amount Of Film Relative To Girth
US20170101205A1 (en) * 2014-06-19 2017-04-13 Crawford Packaging Inc. Pallet Wrap Machine Monitor
US9725195B2 (en) 2008-01-07 2017-08-08 Lantech.Com, Llc Electronic control of metered film dispensing in a wrapping apparatus
US9776748B2 (en) 2013-02-13 2017-10-03 Lantech.Com, Llc Containment force-based wrapping
US9908648B2 (en) 2008-01-07 2018-03-06 Lantech.Com, Llc Demand based wrapping
US9932137B2 (en) 2012-10-25 2018-04-03 Lantech.Com, Llc Corner geometry-based wrapping
US10005581B2 (en) 2012-10-25 2018-06-26 Lantech.Com, Llc Effective circumference-based wrapping
US10005580B2 (en) 2012-10-25 2018-06-26 Lantech.Com, Llc Rotation angle-based wrapping
US10053253B2 (en) 2014-10-07 2018-08-21 Lantech.Com, Llc Graphical depiction of wrap profile for load wrapping apparatus
US10227152B2 (en) 2014-01-14 2019-03-12 Lantech.Com, Llc Dynamic adjustment of wrap force parameter responsive to monitored wrap force and/or for film break reduction
US10934034B2 (en) 2015-09-25 2021-03-02 Lantech.Com, Llc Stretch wrapping machine with automated determination of load stability by subjecting a load to a disturbance
US11208225B2 (en) 2018-08-06 2021-12-28 Lantech.Com, Llc Stretch wrapping machine with curve fit control of dispense rate
US11479378B2 (en) 2019-09-09 2022-10-25 Lantech.Com, Llc Stretch wrapping machine with dispense rate control based on sensed rate of dispensed packaging material and predicted load geometry
US11518557B2 (en) 2019-09-19 2022-12-06 Lantech.Com, Llc Packaging material grading and/or factory profiles
US11667416B2 (en) 2017-09-22 2023-06-06 Lantech.Com, Llc Load wrapping apparatus wrap profiles with controlled wrap cycle interruptions

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Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840006A (en) * 1981-09-30 1989-06-20 International Packaging Machines, Inc. Stretch wrapping machine
US4866909A (en) * 1985-12-04 1989-09-19 Lantech, Inc. High tensile wrapping process
EP0246659A1 (en) * 1986-05-23 1987-11-25 Mima Incorporated Multi-stage prestretch wrapping apparatus and method
US5054263A (en) * 1989-01-04 1991-10-08 Insinooritoimisto Pesmel Oy Method and apparatus for wrapping a plastic film around a load
EP0459045A1 (en) * 1989-01-04 1991-12-04 Insinööritoimisto Pesmel Oy Method and apparatus for wrapping a plastic film around an article
US5301493A (en) * 1992-09-25 1994-04-12 Chen Tsung Yen Steplessly adjustable pre-stretched film wrapping apparatus
FR2712565A1 (en) * 1993-11-19 1995-05-24 Bine Claude Film encapsulation of luggage for security in transit
US9187193B2 (en) * 2005-04-08 2015-11-17 Lantech.Com, Llc Method and apparatus for dispensing an amount of film relative to girth
US20120174533A1 (en) * 2005-04-08 2012-07-12 Lantech.Com, Llc Method and Apparatus For Dispensing An Amount Of Film Relative To Girth
US9725195B2 (en) 2008-01-07 2017-08-08 Lantech.Com, Llc Electronic control of metered film dispensing in a wrapping apparatus
US9908648B2 (en) 2008-01-07 2018-03-06 Lantech.Com, Llc Demand based wrapping
US11104464B2 (en) 2012-10-25 2021-08-31 Lantech.Com, Llc Rotation angle-based wrapping of loads with varying dimensions
US11174056B2 (en) 2012-10-25 2021-11-16 Lantech.Com, Llc Load wrapping apparatus with controlled interventions
US9932137B2 (en) 2012-10-25 2018-04-03 Lantech.Com, Llc Corner geometry-based wrapping
US10005581B2 (en) 2012-10-25 2018-06-26 Lantech.Com, Llc Effective circumference-based wrapping
US10005580B2 (en) 2012-10-25 2018-06-26 Lantech.Com, Llc Rotation angle-based wrapping
US11111046B2 (en) 2012-10-25 2021-09-07 Lantech.Com, Llc Load wrapping apparatus with rotational data shift
US11111045B2 (en) 2012-10-25 2021-09-07 Lantech.Com, Llc Dynamic rotation angle-based wrapping
US11407538B2 (en) 2013-02-13 2022-08-09 Lantech.Com, Llc Packaging material profiling for containment force-based wrapping
US10717554B2 (en) 2013-02-13 2020-07-21 Lantech.Com, Llc Containment force-based wrapping
US11518558B2 (en) 2013-02-13 2022-12-06 Lantech.Com, Llc Containment force-based wrapping
US11912445B2 (en) 2013-02-13 2024-02-27 Lantech.Com, Llc Containment force-based wrapping
US10239645B2 (en) 2013-02-13 2019-03-26 Lantech.Com, Llc Packaging material profiling for containment force-based wrapping
US9776748B2 (en) 2013-02-13 2017-10-03 Lantech.Com, Llc Containment force-based wrapping
US11597554B2 (en) 2014-01-14 2023-03-07 Lantech.Com, Llc Dynamic adjustment of wrap force parameter responsive to monitored wrap force and/or for film break reduction
US10227152B2 (en) 2014-01-14 2019-03-12 Lantech.Com, Llc Dynamic adjustment of wrap force parameter responsive to monitored wrap force and/or for film break reduction
US11685567B2 (en) 2014-01-14 2023-06-27 Lantech.Com, Llc Dynamic adjustment of wrap force parameter responsive to monitored wrap force and/or for film break reduction
US10384822B2 (en) * 2014-06-19 2019-08-20 Crawford Packaging Inc. Pallet wrap machine monitor
US20170101205A1 (en) * 2014-06-19 2017-04-13 Crawford Packaging Inc. Pallet Wrap Machine Monitor
US10053253B2 (en) 2014-10-07 2018-08-21 Lantech.Com, Llc Graphical depiction of wrap profile for load wrapping apparatus
US10926906B2 (en) 2014-10-07 2021-02-23 Lantech.Com, Llc Load stability-based wrapping
US10435191B2 (en) 2014-10-07 2019-10-08 Lantech.Com, Llc Projecting containment force for load wrapping apparatus
US11034470B2 (en) 2015-09-25 2021-06-15 Lantech.Com, Llc Stretch wrapping machine with automatic load profiling
US10934034B2 (en) 2015-09-25 2021-03-02 Lantech.Com, Llc Stretch wrapping machine with automated determination of load stability by subjecting a load to a disturbance
US11505343B2 (en) 2015-09-25 2022-11-22 Lantech.Com, Llc Stretch wrapping machine with automated determination of load stability by subjecting a load to a disturbance
US11731793B2 (en) 2015-09-25 2023-08-22 Lantech.Com, Llc Stretch wrapping machine with automatic load profiling
US11667416B2 (en) 2017-09-22 2023-06-06 Lantech.Com, Llc Load wrapping apparatus wrap profiles with controlled wrap cycle interruptions
US11208225B2 (en) 2018-08-06 2021-12-28 Lantech.Com, Llc Stretch wrapping machine with curve fit control of dispense rate
US11479378B2 (en) 2019-09-09 2022-10-25 Lantech.Com, Llc Stretch wrapping machine with dispense rate control based on sensed rate of dispensed packaging material and predicted load geometry
US11518557B2 (en) 2019-09-19 2022-12-06 Lantech.Com, Llc Packaging material grading and/or factory profiles

Also Published As

Publication number Publication date
DE3465952D1 (en) 1987-10-15
EP0144266B1 (en) 1987-09-09
EP0144266A3 (en) 1985-07-10
ATE29448T1 (en) 1987-09-15
FR2555961B1 (en) 1986-09-12
FR2555961A1 (en) 1985-06-07

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