EP2623446A2 - Film guiding cylinder - Google Patents

Film guiding cylinder Download PDF

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Publication number
EP2623446A2
EP2623446A2 EP13152997.6A EP13152997A EP2623446A2 EP 2623446 A2 EP2623446 A2 EP 2623446A2 EP 13152997 A EP13152997 A EP 13152997A EP 2623446 A2 EP2623446 A2 EP 2623446A2
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EP
European Patent Office
Prior art keywords
guide cylinder
reinforcing
outer shell
cylinder according
profiles
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Granted
Application number
EP13152997.6A
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German (de)
French (fr)
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EP2623446A3 (en
EP2623446B1 (en
Inventor
Yanqiu Cai
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ESOPP
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ESOPP
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Publication of EP2623446A3 publication Critical patent/EP2623446A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs

Definitions

  • the present invention relates to a cylinder for guiding a film, and more particularly a film of synthetic material.
  • Synthetic films and more particularly bi-oriented films, are obtained from an extruded ribbon, after the melt material (polypropylene, polyester, polyamide, pvc, etc.) has been deposited. on a casting drum, cooled by fluid circulation so as to slow the crystallization of the film and allow its subsequent stretching.
  • melt material polypropylene, polyester, polyamide, pvc, etc.
  • the extruded ribbon after passing over the casting drum, is then passed through a longitudinal stretching machine equipped with preheating cylinders for heating the ribbon at the drawing temperature, and a drawn stretching machine train. at different speeds and intended to stretch the ribbon longitudinally.
  • the longitudinal stretching machine generally further comprises a thermo-stabilization group having a succession of cylinders whose function is to ensure thermal expansion and stabilization of the film, before the subsequent transverse stretching of this film.
  • the ribbon thus stretched in the longitudinal direction then enters a transverse stretching machine which comprises two groups of grippers which take respectively the ribbon on its two sides, the two groups of grippers being mounted on chains whose spacing increases gradually until 'to reach the desired width.
  • a suitable device opens the clamps and allows the film thus formed to be transferred, after cooling to a set of rolls, to a winding device at which the film is wound on a roll. storage roll.
  • a first method for manufacturing a cylinder of such length consists in particular in steelmaking a seamless tube (made in particular by centrifugation of molten steel) of a length slightly greater than that of the cylinder to be produced.
  • a second method for producing a cylinder of very great length is to wind a flat sheet of appropriate length and to weld together the two edges of the sheet disposed opposite one another. For this, it is necessary to have a roll of length equivalent to that of the cylinder to be produced, that is to say of the order of 8 to 10 m. Such a roller is obviously very expensive and rare, which also makes it expensive to manufacture cylinders according to this second method.
  • a third method for producing a cylinder of great length consists of producing several cylindrical sections of the same length, for example of the order of 3 m, and to butt-weld several of these cylindrical sections, for example three cylindrical sections.
  • the cylinders obtained by the implementation of the methods described above necessarily have a significant wall thickness, of the order of 10 to 12 mm, to ensure a satisfactory mechanical strength.
  • cylinders have a large mass which is generally not regularly distributed, causing the appearance of significant unbalance for each cylinder.
  • each cylinder undergoes a recovery step to eliminate the unbalance resulting from the non-straightness of the generatrices of the cylinder, a step of machining the inner and outer surfaces of the cylinder to compensate for the unbalance resulting from variations in thicknesses of the cylinder wall, and a balancing step of fixing balancing masses at the ends and at the center of the cylinder.
  • a recovery step to eliminate the unbalance resulting from the non-straightness of the generatrices of the cylinder
  • a step of machining the inner and outer surfaces of the cylinder to compensate for the unbalance resulting from variations in thicknesses of the cylinder wall
  • a balancing step of fixing balancing masses at the ends and at the center of the cylinder.
  • a cooling cylinder comprises, in known manner, an inner ring, which can be manufactured according to the manufacturing methods previously described, heat transfer liquid circulation channels mounted on the outer surface of the inner ring and extending helically, and an outer shell fitted around the circulation channels.
  • the fitting of the outer shell is generally carried out after heating to about 600 ° of the outer shell.
  • the coolant circulating in these channels is likely to generate an imbalance causing the appearance of vibrations in the cooling cylinder.
  • the outer shell and the inner shell must necessarily have a significant wall thickness, which results in the appearance of a significant unbalance inducing the same difficulties than those stated above for cylinders without internal cooling device.
  • the present invention aims to remedy these disadvantages.
  • the technical problem underlying the invention therefore consists in providing a guiding cylinder which is of reliable, lightweight and economical structure.
  • the realization of the guide cylinder from longitudinal reinforcement profiles in particular ensures a significant mechanical strength to the guide cylinder and gives the latter a geometric stability.
  • the outer shell must not necessarily contribute to the rigidity of the guide cylinder. It is thus now possible to use an outer shell of small thickness, for example of the order of 3 mm, which allows to greatly reduce the weight of the guide cylinder, and therefore to greatly limit the deflection of the guide cylinder under his own weight.
  • Such a structure of the guide cylinder therefore makes it possible to use an external ferrule made from several welded cylindrical sections, without the risk of rupture of the welds of the latter, since the considerable rigidity of the internal structure of the cylinder substantially eliminates all efforts. on said welds. This results in a reliable guide cylinder, light and easy to manufacture.
  • the guide cylinder is a cooling cylinder
  • an improvement in heat exchange between the coolant circulating inside the cylinder and the film driven by the cylinder can be easily obtained using a thin outer shell.
  • This improvement in heat exchange allows the use of smaller amounts of heat transfer fluid, and even allows, as indicated below, to ensure the cooling function not by a circulation of liquid water, but by a fog of water spray.
  • the guide cylinder is a drive cylinder, that is to say that at least one of the first and second support shafts is intended to be associated with means such as a drive motor.
  • the guide cylinder preferably comprises at least four reinforcing profiles, and for example up to thirty-six reinforcing profiles.
  • Each reinforcing section advantageously extends substantially parallel to the axis of the guide cylinder.
  • Each reinforcing profile has for example a length substantially identical to that of the outer shell.
  • the reinforcing profiles are regularly distributed around the periphery of the first and second end members.
  • each of the first and second end members has a cylindrical outer surface on which the reinforcing profiles are fixed.
  • each reinforcing section is flat and extends substantially radially relative to the axis of the guide cylinder. According to other embodiments of the invention, each reinforcing section may have an L-shaped or U-shaped cross section.
  • the guide cylinder comprises at least one reinforcing member, preferably annular, disposed between the first and second end members and on which are mounted the reinforcing profiles.
  • the guide cylinder comprises a plurality of reinforcement members axially offset with respect to each other.
  • the or each reinforcing member has a circular outer section.
  • At least one reinforcing member comprises a plurality of notches in each of which is engaged one of the reinforcing profiles.
  • Each notch opens outwardly advantageously, and preferably has a depth corresponding at least to the width of the reinforcing profiles.
  • the outer shell comprises a plurality of tubular sections axially aligned and mounted around the reinforcing profiles so that the inner wall of each tubular section cooperates with the reinforcing profiles.
  • the outer shell comprises for example two, three or four tubular sections.
  • Each tubular section may for example be obtained from a rolled sheet whose edges facing each other are welded together.
  • each tubular section has a substantially circular outer section.
  • the tubular sections are arranged substantially end to end.
  • each tubular section is fixed on a reinforcing member.
  • the ferrule comprises at least three tubular sections and at least two reinforcing members
  • the two end tubular sections advantageously have an end attached to one of the first and second end members and an end fixed to one of the reinforcing members, while the ends of each tubular section disposed between the two end tubular sections are respectively fixed to a respective reinforcing member.
  • At least one reinforcement member comprises a first annular groove arranged to receive the end of a first tubular section, and a second annular groove, opposite the first annular groove, arranged to receive the end of a second section. tubular.
  • the at least one reinforcing member has an intermediate portion disposed between the first and second grooves, the intermediate portion delimiting an outer surface extending substantially in continuity with the outer surfaces of the first and second tubular sections.
  • the intermediate portion of the at least one reinforcing member partially delimits the outer shell.
  • the intermediate portion of the at least one reinforcement member comprises a bore opening outwardly of the guide cylinder, and a plug arranged to close the bore.
  • the outer shell could be formed from a single sheet of appropriate length wound and whose two edges arranged opposite one another are welded together. According to another alternative, the outer shell could be formed from a seamless tube of appropriate length.
  • each of the first and second support shafts has a mounting portion mounted within the respective end member, and a support portion projecting from the outside of the housing. respective end element.
  • the first and second end members extend substantially coaxially with the axis of the guide cylinder.
  • each of the first and second end members has a tubular shape and extends over a portion of the length of the guide cylinder.
  • Each of the first and second end members preferably has a constant outer diameter.
  • Each of the first and second end members has a length for example between 500 and 1000 mm.
  • each of the first and second end members could have a disk shape.
  • each of the first and second end members has a circular outer section.
  • the first and second support shafts advantageously extend substantially coaxially with the axis of the guide cylinder.
  • the guide cylinder comprises a first and a second end plate extending transversely to the axis of the guide cylinder, the first and second support shafts protruding respectively through the first and second end plates.
  • the first and second end plates are preferably fixed respectively to the first and second ends of the outer shell.
  • the guiding cylinder comprises an internal volume
  • each of the first and second shafts of support comprises a flow passage arranged to put in communication the internal volume with the outside of the guide cylinder.
  • the first support shaft comprises a spray nozzle.
  • the present invention further relates to a cooling assembly, characterized in that it comprises a guide cylinder according to the invention, supply means connected to the flow passage of the first support shaft and arranged to supply heat transfer fluid the internal volume, and discharge means connected to the flow passage of the second support shaft and arranged to discharge the heat transfer fluid contained in the internal volume outside the guide cylinder.
  • the discharge means comprise suction means, such as a fan, arranged to suck the coolant contained in the internal volume outside the guide cylinder.
  • suction means are arranged to generate a depression in the internal volume.
  • the feeding means are preferably arranged to supply the internal volume with water, and more particularly with water spray mist.
  • the guide cylinder 2 comprises a cylindrical outer ring 3, and two end plates 4 extending transversely to the axis of the guide cylinder and respectively fixed to the ends of the outer shell 3.
  • the guide cylinder 2 further comprises two support shafts 5 extending coaxially with the axis of the guide cylinder and projecting respectively through the end plates 4.
  • the guide cylinder 2 also comprises two tubular end elements 6 mounted inside the outer shell 3, and respectively disposed at the ends of the outer shell 3.
  • the two end members 6 extend substantially coaxially with the axis of the guide cylinder and over a portion of the length of the guide cylinder.
  • Each end element 6 has a length for example between 500 and 1000 mm.
  • Each end member 6 preferably has a circular outer section and a constant outer diameter.
  • Each support shaft 5 is mounted on one of the end members 6.
  • Each support shaft 5 more particularly comprises a mounting portion 5a mounted inside the respective end member 6, and a portion of 5b support projecting outside the respective end member 6.
  • the mounting portion 5a of each support shaft 5 has an outer diameter slightly greater than the internal diameter of the end element. 6 respective.
  • the assembly of a support shaft 5 and the respective end member 6 comprises a first step of heating the end member 6 at a high temperature such that it expands and its inner diameter increases, and a second step of fitting the end member 6 around the mounting portion 5a of the respective support shaft 5, before the end member 6 does not cool.
  • This assembly may optionally include an additional step of welding the support shaft 5 on the respective end member 6.
  • the guide cylinder 2 further comprises a plurality of longitudinal reinforcing profiles 7 extending substantially parallel to the axis of the guide cylinder 2 and having a length substantially corresponding to that of the outer shell 3.
  • the reinforcing profiles 7 are preferably metal, and may be made for example of steel.
  • the reinforcing profiles 7 advantageously have a thickness of between 1 and 5 mm.
  • each reinforcing section 7 is fixed, preferably by welding, respectively to the two end members 6.
  • the reinforcing profiles 7 are evenly distributed around the periphery of the two end elements 6 and form a light support and rigid for the outer shell 3.
  • the guide cylinder 2 preferably comprises at least four reinforcing profiles 7, and for example up to thirty-six reinforcing profiles 7. According to the embodiment shown in the figures, the guide cylinder 2 comprises twelve reinforcing profiles 7.
  • each reinforcing section 7 is flat and extends radially with respect to the axis of the guide cylinder 2.
  • each reinforcing section 7 could also have an L-shaped or U-shaped cross section.
  • each reinforcing profile 7 advantageously has a flat longitudinal attachment portion 7a fixed on the two end elements 6.
  • the guide cylinder 2 further comprises a plurality of annular reinforcing members 8 on which the reinforcing profiles 7 are mounted.
  • the reinforcing members 8 are arranged between the two end elements 6, and are axially offset by one another. compared to others.
  • the reinforcing members 8 are preferably regularly spaced from each other.
  • Each reinforcing member 8 advantageously has a disc shape.
  • each reinforcement member 8 advantageously comprises a plurality of notches 9 in each of which is engaged one of the reinforcing profiles 7.
  • the notches 9 open radially outwards and has a depth corresponding substantially to the width of the reinforcing profiles 7.
  • each reinforcing member 8 is devoid of a notch and advantageously has a cylindrical outer surface on which are fixed, preferably by welding, the reinforcing profiles 7, and more particularly the portions of fixing 7a reinforcement profiles 7 when the latter have a section U or L.
  • the outer shell 3 is formed by a plurality of axially aligned tubular sections 10 and mounted around the reinforcing profiles 7 so that the inner wall of each tubular section 10 cooperates with the reinforcing profiles 7.
  • the outer shell 3 is example formed by four tubular sections 10 arranged substantially end to end.
  • Each tubular section 10 is advantageously formed from a flat sheet of appropriate length wound whose two edges arranged opposite one another are welded together.
  • Each tubular section 10 may be made for example of stainless steel or carbon steel.
  • the tubular sections 10 extend substantially coaxially with the axis of the guide cylinder 2 and have a circular outer section. Each tubular section 10 advantageously has substantially constant inner and outer diameters.
  • the two tubular sections 10 disposed at the ends of the outer shell 3 advantageously have a first end attached to one of the end members 6 and a second end attached to one of the reinforcing members 8.
  • the ends of the two tubular sections 10 arranged in the center of the outer shell 3 are respectively fixed on a respective reinforcing member 8. Fixing the ends of the tubular sections 10 on the respective reinforcing members 8 is preferably made by welding.
  • each reinforcing member 8 comprises a first annular groove 8a arranged to receive the end of an adjacent tubular section 10, and a second annular groove 8b, opposite to the first annular groove 8a, arranged to receive the end of an adjacent tubular section.
  • Each reinforcing member 8 has an intermediate portion 8c disposed between the first and second grooves 8a, 8b.
  • the intermediate portion 8c delimits a cylindrical outer surface extending substantially in continuity with the external surfaces of the adjacent tubular sections 10.
  • the intermediate portion 8c of each reinforcing member 8 defines part of the outer shell 3.
  • each reinforcing member 8 may advantageously comprise a bore 11 opening towards the outside of the guide cylinder 2, and a plug 12 arranged to seal the bore 11. These arrangements make it possible, if necessary, to machine the inside the reinforcing member 8 so as to reduce the mass of the latter in order to balance the guide cylinder 2.
  • the cap 12 may for example comprise a thread arranged to cooperate with a tapping formed on the reinforcing member 8.
  • each support shaft 5 comprises an axial flow passage 14 opening on the one hand in the internal volume 13 and on the other hand at the free end of the portion 5b respective support.
  • the figure 12 represents a cooling assembly 15 comprising a guiding cylinder 2 according to the invention, supply means 16 connected to the flow passage 14 of one of the support shafts 5 and arranged to supply heat transfer fluid to the internal volume 13 , and discharge means 17 connected to the flow passage 14 of the other support shaft 5 and arranged to discharge the coolant contained in the internal volume 13 outside the guide cylinder 2.
  • the feed means 16 are preferably arranged to supply the internal volume 13 with water, and especially with water spray mist.
  • the support shaft 5 connected to the supply means 16 comprises a spray nozzle.
  • the water mist introduced into the internal volume 13 is intended to circulate, because of the centrifugal force resulting from the rotation of the guide cylinder, along the inner wall of the outer shell 3, and more particularly tubular sections 10, which allows to maintain the outer ring at low temperature, and thus to cool the film in contact with the outer shell.
  • the discharge means 17 comprise suction means, such as a fan, arranged to suck the water mist contained in the internal volume 13 outside the guide cylinder.
  • suction means are arranged to generate a depression in the internal volume. Such a depression makes it possible to promote the vaporization of the water contained in the internal volume 13, and therefore to improve the heat exchange between the water and the ferrule, but also to reduce the vaporization temperature of the water, reducing thus the temperature of the outer shell.
  • the invention is not limited to the embodiments of this guide cylinder, described above as examples, it encompasses all the variants.

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  • Rolls And Other Rotary Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The roller (2) has an external ring (3) comprising an end portion and another end portion that is opposed to the former end portion. A set of end elements (6) is mounted respectively in the former end portion and the latter end portion of ring. A set of support shafts (5) is mounted respectively on the end elements. A set of longitudinal reinforcements (7) connects the set of end elements. A set of sections of the reinforcements is distributed on circumference of the set of end elements to form a support for the external ring. An independent claim is also included for a cooling unit.

Description

La présente invention concerne un cylindre de guidage d'un film, et plus particulièrement d'un film en matière synthétique.The present invention relates to a cylinder for guiding a film, and more particularly a film of synthetic material.

Les films en matière synthétique, et plus particulièrement les films bi-orientés, sont obtenus à partir d'un ruban extrudé, après que de la matière à l'état fondu (polypropylène, polyester, polyamide, pvc, etc.) ait été déposée sur un tambour de coulée, refroidi par circulation de fluide de façon à ralentir la cristallisation du film et à permettre son étirage ultérieur.Synthetic films, and more particularly bi-oriented films, are obtained from an extruded ribbon, after the melt material (polypropylene, polyester, polyamide, pvc, etc.) has been deposited. on a casting drum, cooled by fluid circulation so as to slow the crystallization of the film and allow its subsequent stretching.

Le ruban extrudé, après son passage sur le tambour de coulée, passe ensuite dans une machine d'étirage longitudinal équipée de cylindres de préchauffage destinés à réchauffer le ruban à la température d'étirage, et d'un train de cylindres d'étirage entraînés à des vitesses différentes et destinés à étirer longitudinalement le ruban. La machine d'étirage longitudinal comprend généralement en outre un groupe de thermo-stabilisation présentant une succession de cylindres dont la fonction est d'assurer la détente thermique et la stabilisation du film, avant l'étirage transversal subséquent de ce film.The extruded ribbon, after passing over the casting drum, is then passed through a longitudinal stretching machine equipped with preheating cylinders for heating the ribbon at the drawing temperature, and a drawn stretching machine train. at different speeds and intended to stretch the ribbon longitudinally. The longitudinal stretching machine generally further comprises a thermo-stabilization group having a succession of cylinders whose function is to ensure thermal expansion and stabilization of the film, before the subsequent transverse stretching of this film.

Le ruban ainsi étiré dans le sens longitudinal pénètre ensuite dans une machine d'étirage transversal qui comporte deux groupes de pinces qui prennent respectivement le ruban sur ses deux côtés, les deux groupes de pinces étant montés sur des chaines dont l'écartement augmente progressivement jusqu'à atteindre la largeur désirée.The ribbon thus stretched in the longitudinal direction then enters a transverse stretching machine which comprises two groups of grippers which take respectively the ribbon on its two sides, the two groups of grippers being mounted on chains whose spacing increases gradually until 'to reach the desired width.

Lorsque cette opération d'étirage a été réalisée, un dispositif approprié ouvre les pinces et permet au film ainsi constitué d'être transféré, après refroidissement sur un ensemble de cylindres, à un dispositif d'enroulement au niveau duquel le film est enroulé sur un rouleau de stockage.When this stretching operation has been performed, a suitable device opens the clamps and allows the film thus formed to be transferred, after cooling to a set of rolls, to a winding device at which the film is wound on a roll. storage roll.

Afin d'obtenir des films en matière synthétique de très grande largeur, par exemple de l'ordre de 8 à 10 m, il est nécessaire que les différents cylindres utilisés pour entraîner et guider le film jusqu'au dispositif d'enroulement présentent une longueur équivalente à la largeur des films à produire.In order to obtain films of synthetic material of very large width, for example of the order of 8 to 10 m, it is necessary that the various rolls used to drive and guide the film to the winding device have a length equivalent to the width of the films to be produced.

Un premier procédé pour fabriquer un cylindre d'une telle longueur consiste notamment à fabriquer en aciérie un tube sans soudure (réalisé notamment par centrifugation d'acier en fusion) d'une longueur légèrement supérieure à celle du cylindre à produire.A first method for manufacturing a cylinder of such length consists in particular in steelmaking a seamless tube (made in particular by centrifugation of molten steel) of a length slightly greater than that of the cylinder to be produced.

Il est évident que peu d'aciéries dans le monde sont adaptées pour produire de tels tubes, ce qui rend onéreux la fabrication de cylindres selon ce premier procédé.It is obvious that few steel mills in the world are adapted to produce such tubes, which makes it expensive to manufacture cylinders according to this first method.

Un deuxième procédé pour produire un cylindre de très grande longueur consiste à enrouler une tôle plane de longueur appropriée et à souder entre eux les deux bords de la tôle disposés en regard l'un de l'autre. Pour cela, il est nécessaire de disposer d'une rouleuse de longueur équivalente à celle du cylindre à produire, c'est-à-dire de l'ordre de 8 à 10 m. Une telle rouleuse est évidemment très onéreuse et rares, ce qui rend également onéreux la fabrication de cylindres selon ce deuxième procédé.A second method for producing a cylinder of very great length is to wind a flat sheet of appropriate length and to weld together the two edges of the sheet disposed opposite one another. For this, it is necessary to have a roll of length equivalent to that of the cylinder to be produced, that is to say of the order of 8 to 10 m. Such a roller is obviously very expensive and rare, which also makes it expensive to manufacture cylinders according to this second method.

Un troisième procédé pour produire un cylindre de très grande longueur consiste à réaliser plusieurs tronçons cylindriques de même longueur, par exemple de l'ordre de 3 m, et à souder bout à bout plusieurs de ces tronçons cylindriques, par exemple trois tronçons cylindriques.A third method for producing a cylinder of great length consists of producing several cylindrical sections of the same length, for example of the order of 3 m, and to butt-weld several of these cylindrical sections, for example three cylindrical sections.

Ce troisième procédé, bien que réduisant fortement les coûts de fabrication de cylindres de très grande longueur, n'est pas satisfaisant en ce qui concerne la fiabilité des cylindres obtenus. En effet, de tels cylindres présentent, quels que soient leur diamètre et leur épaisseur, une flèche résultant de leur propre poids. Or, une telle flèche induit nécessairement, lorsque les cylindres sont entraînés en rotation, des efforts alternés au niveau des soudures reliant les différents tronçons cylindriques, qui se traduisent rapidement par des ruptures des soudures. De telles ruptures peuvent être très préjudiciables, notamment pour l'intégrité des opérateurs et des machines situés à proximité.This third method, although greatly reducing the manufacturing costs of very long cylinders, is not satisfactory as regards the reliability of the cylinders obtained. Indeed, such cylinders have, whatever their diameter and thickness, an arrow resulting from their own weight. However, such an arrow necessarily induces, when the cylinders are driven in rotation, alternating forces at the welds connecting the different cylindrical sections, which quickly result in breaks welds. Such breaks can be very detrimental, especially for the integrity of operators and machines located nearby.

En outre, les cylindres obtenus par la mise en oeuvre des procédés décrits précédemment présentent nécessairement une épaisseur de paroi significative, de l'ordre de 10 à 12 mm, afin de leur assurer une tenue mécanique satisfaisante. Ainsi, de tels cylindres présentent une masse importante qui n'est généralement pas régulièrement répartie, provoquant l'apparition d'un balourd important pour chaque cylindre.In addition, the cylinders obtained by the implementation of the methods described above necessarily have a significant wall thickness, of the order of 10 to 12 mm, to ensure a satisfactory mechanical strength. Thus, such cylinders have a large mass which is generally not regularly distributed, causing the appearance of significant unbalance for each cylinder.

Pour compenser un tel balourd, chaque cylindre subit une étape de redressement pour éliminer le balourd qui résulte de la non rectitude des génératrices du cylindre, une étape d'usinage des surfaces intérieure et extérieure du cylindre pour compenser le balourd qui résulte des variations d'épaisseurs de la paroi du cylindre, et une étape d'équilibrage consistant à fixer des masses d'équilibrage aux extrémités et au centre du cylindre. Afin de réaliser ces étapes de redressement, d'usinage et d'équilibrage, il est nécessaire de disposer de machines et d'outils complexes et onéreux, augmentant encore les coûts de fabrication des cylindres.To compensate for such unbalance, each cylinder undergoes a recovery step to eliminate the unbalance resulting from the non-straightness of the generatrices of the cylinder, a step of machining the inner and outer surfaces of the cylinder to compensate for the unbalance resulting from variations in thicknesses of the cylinder wall, and a balancing step of fixing balancing masses at the ends and at the center of the cylinder. In order to carry out these recovery, machining and balancing steps, it is necessary to have complex and expensive machinery and tools, further increasing the costs of manufacturing the rolls.

Les différents procédés décrits ci-dessus permettent la fabrication de cylindres de guidage ou de détour dépourvus de dispositif de refroidissement interne. D'autres cylindres, de même longueur, sont dits cylindres de refroidissement et présentent un dispositif de refoidissement.The various processes described above allow the manufacture of guiding or diverting rolls devoid of internal cooling device. Other cylinders, of the same length, are called cooling cylinders and have a cooling device.

Un cylindre de refroidissement comprend, de façon connue, une virole interne, qui peut être fabriquée selon les procédés de fabrication précédemment décrtis, des canaux de circulation de liquide caloporteur montés sur la surface extérieure de la virole interne et s'étendant de manière hélicoïdale, et une virole externe emmanchée autour des canaux de circulation. L'emmanchement de la virole externe s'effectue généralement après réchauffement à environ 600° de la virole externe.A cooling cylinder comprises, in known manner, an inner ring, which can be manufactured according to the manufacturing methods previously described, heat transfer liquid circulation channels mounted on the outer surface of the inner ring and extending helically, and an outer shell fitted around the circulation channels. The fitting of the outer shell is generally carried out after heating to about 600 ° of the outer shell.

Par conséquent, la fabrication d'un cylindre de refroidissement de grande taille est encore plus complexe et onéreuse que celle des cylindres décrits précédemment.Therefore, the manufacture of a large cooling cylinder is even more complex and expensive than that of the cylinders described above.

De plus, du fait du montage hélicoïdal des canaux de circulation, le liquide caloporteur en circulation dans ces canaux est susceptible de générer un balourd provoquant l'apparition de vibrations dans le cylindre de refroidissement.In addition, because of the helical assembly of the circulation channels, the coolant circulating in these channels is likely to generate an imbalance causing the appearance of vibrations in the cooling cylinder.

En outre, afin d'assurer une tenue mécanique satisfaisante à un tel cylindre de refroidissement, la virole extérieure et la virole intérieure doivent nécessairement présenter une épaisseur de paroi significative, ce qui a pour conséquence l'apparition d'un balourd important induisant les mêmes difficultés que celles énoncées ci-dessus pour les cylindres dépourvus de dispositif de refroidissement interne.In addition, in order to ensure satisfactory mechanical strength for such a cooling cylinder, the outer shell and the inner shell must necessarily have a significant wall thickness, which results in the appearance of a significant unbalance inducing the same difficulties than those stated above for cylinders without internal cooling device.

La présente invention vise à remédier à ces inconvénients.The present invention aims to remedy these disadvantages.

Le problème technique à la base de l'invention consiste donc à fournir un cylindre de guidage qui soit de structure fiable, légère et économique.The technical problem underlying the invention therefore consists in providing a guiding cylinder which is of reliable, lightweight and economical structure.

A cet effet, la présente invention concerne un cylindre de guidage d'un film, par exemple en matière synthétique, comprenant :

  • une virole externe comprenant une première portion d'extrémité et une deuxième portion d'extrémité opposée à la première portion d'extrémité,
  • un premier et un deuxième éléments d'extrémité montés respectivement dans les première et deuxième portions d'extrémité de la virole externe,
  • un premier et un deuxième arbres de support montés respectivement sur les premier et deuxième éléments d'extrémité,
caractérisé en ce que le cylindre de guidage comprend en outre une pluralité de profilés de renfort longitudinaux reliant les premier et deuxième éléments d'extrémité et fixés chacun respectivement sur les premier et deuxième éléments d'extrémité, les profilés de renfort étant répartis sur le pourtour des premier et deuxième éléments d'extrémité et formant un support pour la virole externe.For this purpose, the present invention relates to a guide cylinder of a film, for example of synthetic material, comprising:
  • an outer shell comprising a first end portion and a second end portion opposite the first end portion,
  • first and second end members respectively mounted in the first and second end portions of the outer shell,
  • first and second support shafts mounted respectively on the first and second end members,
characterized in that the guide cylinder further comprises a plurality of longitudinal reinforcing profiles connecting the first and second end members and each respectively fixed to the first and second end members, the reinforcing profiles being distributed around the periphery. first and second end members and forming a support for the outer shell.

La réalisation du cylindre de guidage à partir notamment de profilés de renfort longitudinaux assure une tenue mécanique importante au cylindre de guidage et confère à ce dernier une stabilité géométrique.The realization of the guide cylinder from longitudinal reinforcement profiles in particular ensures a significant mechanical strength to the guide cylinder and gives the latter a geometric stability.

De ce fait, la virole externe ne doit plus nécessairement contribuer à la rigidité du cylindre de guidage. Il est ainsi désormais possible d'utiliser une virole externe de faible épaisseur, par exemple de l'ordre de 3 mm, ce qui permet de réduire fortement le poids du cylindre de guidage, et donc de limiter fortement le fléchissement du cylindre de guidage sous son propre poids.Therefore, the outer shell must not necessarily contribute to the rigidity of the guide cylinder. It is thus now possible to use an outer shell of small thickness, for example of the order of 3 mm, which allows to greatly reduce the weight of the guide cylinder, and therefore to greatly limit the deflection of the guide cylinder under his own weight.

Une telle structure du cylindre de guidage permet par conséquent d'utiliser une virole externe fabriquée à partir de plusieurs tronçons cylindriques soudés, sans risque de rupture des soudures de ces derniers, puisque la rigidité importante de la structure interne du cylindre supprime sensiblement tous les efforts sur lesdites soudures. Il en résulte un cylindre de guidage fiable, léger et aisé à fabriquer.Such a structure of the guide cylinder therefore makes it possible to use an external ferrule made from several welded cylindrical sections, without the risk of rupture of the welds of the latter, since the considerable rigidity of the internal structure of the cylinder substantially eliminates all efforts. on said welds. This results in a reliable guide cylinder, light and easy to manufacture.

En outre, une telle structure du cylindre de guidage assure un équilibrage aisé de ce dernier, puisque les masses d'équilibrage peuvent être non seulement aisément fixées aux extrémités du cylindre, mais également aisément fixées au centre du cylindre comme cela est requit pour chaque cylindre destiné à être entraîner à une haute vitesse de rotation.In addition, such a structure of the guide cylinder ensures easy balancing of the latter, since the balancing masses can be not only easily attached to the ends of the cylinder, but also easily attached to the center of the cylinder as is required for each cylinder intended to be driven at a high speed of rotation.

De plus, lorsque le cylindre de guidage est un cylindre de refroidissement, une amélioration des échanges thermiques entre le fluide caloporteur circulant à l'intérieur du cylindre et le film entraîné par le cylindre peut être aisément obtenue en utilisant une virole externe de faible épaisseur. Cette amélioration des échanges thermiques permet l'utilisation de quantités moins importantes de fluide caloporteur, et permet même, comme il est indiqué ci-dessous, d'assurer la fonction de refroidissement non pas par une circulation d'eau liquide, mais par un brouillard d'eau pulvérisé.In addition, when the guide cylinder is a cooling cylinder, an improvement in heat exchange between the coolant circulating inside the cylinder and the film driven by the cylinder can be easily obtained using a thin outer shell. This improvement in heat exchange allows the use of smaller amounts of heat transfer fluid, and even allows, as indicated below, to ensure the cooling function not by a circulation of liquid water, but by a fog of water spray.

Selon un mode de réalisation de l'invention, le cylindre de guidage est un cylindre d'entraînement, c'est-à-dire qu'au moins l'un des premier et deuxième arbres de support est destiné à être associé à des moyens d'entraînement, tels qu'un moteur d'entraînement.According to one embodiment of the invention, the guide cylinder is a drive cylinder, that is to say that at least one of the first and second support shafts is intended to be associated with means such as a drive motor.

Le cylindre de guidage comporte de préférence au moins quatre profilés de renfort, et par exemple jusqu'à trente-six profilés de renfort. Chaque profilé de renfort s'étend de façon avantageuse sensiblement parallèlement à l'axe du cylindre de guidage. Chaque profilé de renfort présente par exemple une longueur sensiblement identique à celle de la virole externe. Préférentiellement, les profilés de renfort sont régulièrement répartis sur le pourtour des premier et deuxième éléments d'extrémité.The guide cylinder preferably comprises at least four reinforcing profiles, and for example up to thirty-six reinforcing profiles. Each reinforcing section advantageously extends substantially parallel to the axis of the guide cylinder. Each reinforcing profile has for example a length substantially identical to that of the outer shell. Preferably, the reinforcing profiles are regularly distributed around the periphery of the first and second end members.

De préférence, chacun des premier et deuxième éléments d'extrémité présente une surface extérieure cylindrique sur laquelle sont fixés les profilés de renfort.Preferably, each of the first and second end members has a cylindrical outer surface on which the reinforcing profiles are fixed.

Selon un mode de réalisation de l'invention, chaque profilé de renfort est plat et s'étend sensiblement radialement par rapport à l'axe du cylindre de guidage. Selon d'autres modes de réalisation de l'invention, chaque profilé de renfort peut présenter une section transversale en L ou en U.According to one embodiment of the invention, each reinforcing section is flat and extends substantially radially relative to the axis of the guide cylinder. According to other embodiments of the invention, each reinforcing section may have an L-shaped or U-shaped cross section.

Selon un mode de réalisation de l'invention, le cylindre de guidage comprend au moins un organe de renfort, de préférence annulaire, disposé entre les premier et deuxième éléments d'extrémité et sur lequel sont montés les profilés de renfort. Ces dispositions permettent d'augmenter la rigidité du cylindre de guidage sans augmenter de manière significative son poids, et d'augmenter sa résistance à la torsion, une telle torsion étant notamment générée lorsque le cylindre est entraîné à haute vitesse de rotation ou ralenti rapidement, par exemple lors d'un freinage d'urgence.According to one embodiment of the invention, the guide cylinder comprises at least one reinforcing member, preferably annular, disposed between the first and second end members and on which are mounted the reinforcing profiles. These arrangements make it possible to increase the rigidity of the guide cylinder without significantly increasing its weight, and to increase its resistance to torsion, such a torsion being notably generated when the cylinder is driven at high speed of rotation or slowed down rapidly, for example during an emergency braking.

Préférentiellement, le cylindre de guidage comprend une pluralité d'organes de renfort décalés axialement les uns par rapport aux autres.Preferably, the guide cylinder comprises a plurality of reinforcement members axially offset with respect to each other.

Avantageusement, le ou chaque organe de renfort présente une section extérieure circulaire.Advantageously, the or each reinforcing member has a circular outer section.

Selon un mode de réalisation de l'invention, au moins un organe de renfort comporte une pluralité d'encoches dans chacune desquelles est engagé l'un des profilés de renfort. Chaque encoche débouche avantageusement vers l'extérieur, et présente de préférence une profondeur correspondant au moins à la largeur des profilés de renfort.According to one embodiment of the invention, at least one reinforcing member comprises a plurality of notches in each of which is engaged one of the reinforcing profiles. Each notch opens outwardly advantageously, and preferably has a depth corresponding at least to the width of the reinforcing profiles.

De façon avantageuse, la virole externe comporte une pluralité de tronçons tubulaires alignés axialement et montés autour des profilés de renfort de telle sorte que la paroi intérieure de chaque tronçon tubulaire coopère avec les profilés de renfort. La virole externe comporte par exemple deux, trois ou quatre tronçons tubulaires.Advantageously, the outer shell comprises a plurality of tubular sections axially aligned and mounted around the reinforcing profiles so that the inner wall of each tubular section cooperates with the reinforcing profiles. The outer shell comprises for example two, three or four tubular sections.

Chaque tronçon tubulaire peut par exemple être obtenu à partir d'une tôle enroulée dont les bords tournés l'un vers l'autre sont soudés entre eux.Each tubular section may for example be obtained from a rolled sheet whose edges facing each other are welded together.

De préférence, chaque tronçon tubulaire présente une section extérieure sensiblement circulaire.Preferably, each tubular section has a substantially circular outer section.

Selon un mode de réalisation de l'invention, les tronçons tubulaires sont disposés sensiblement bout à bout.According to one embodiment of the invention, the tubular sections are arranged substantially end to end.

Selon un mode de réalisation de l'invention, au moins l'une des extrémités de chaque tronçon tubulaire est fixée sur un organe de renfort. Lorsque la virole comporte au moins trois tronçons tubulaires et au moins deux organes de renfort, les deux tronçons tubulaires d'extrémité présentent avantageusement une extrémité fixée sur l'un des premier et deuxième éléments d'extrémité et une extrémité fixée sur l'un des organes de renfort, tandis que les extrémités de chaque tronçon tubulaire disposé entre les deux tronçons tubulaires d'extrémité sont fixées respectivement sur un organe de renfort respectif.According to one embodiment of the invention, at least one of the ends of each tubular section is fixed on a reinforcing member. When the ferrule comprises at least three tubular sections and at least two reinforcing members, the two end tubular sections advantageously have an end attached to one of the first and second end members and an end fixed to one of the reinforcing members, while the ends of each tubular section disposed between the two end tubular sections are respectively fixed to a respective reinforcing member.

Avantageusement, au moins un organe de renfort comporte une première gorge annulaire agencée pour recevoir l'extrémité d'un premier tronçon tubulaire, et une deuxième gorge annulaire, opposée à la première gorge annulaire, agencée pour recevoir l'extrémité d'un deuxième tronçon tubulaire. De préférence, l'au moins un organe de renfort présente une portion intermédiaire disposée entre les première et deuxième gorges, la portion intermédiaire délimitant une surface externe s'étendant sensiblement dans la continuité des surfaces externes des premier et deuxième tronçons tubulaires. De façon préférentielle, la portion intermédiaire de l'au moins un organe de renfort délimite en partie la virole externe.Advantageously, at least one reinforcement member comprises a first annular groove arranged to receive the end of a first tubular section, and a second annular groove, opposite the first annular groove, arranged to receive the end of a second section. tubular. Preferably, the at least one reinforcing member has an intermediate portion disposed between the first and second grooves, the intermediate portion delimiting an outer surface extending substantially in continuity with the outer surfaces of the first and second tubular sections. Preferably, the intermediate portion of the at least one reinforcing member partially delimits the outer shell.

Selon un mode de réalisation de l'invention, la portion intermédiaire de l'au moins un organe de renfort comporte un alésage débouchant vers l'extérieur du cylindre de guidage, et un bouchon agencé pour obturer l'alésage. Ces dispositions permettent un équilibrage final du cylindre lorsque les tronçons tubulaires qui constituent la virole externe ont été mis en place, ce qui se traduit inévitablement par un très léger balourd qui doit être compensé, malgré l'équilibrage de la structure interne du cylindre préalable à la soudure des tronçons tubulaires.According to one embodiment of the invention, the intermediate portion of the at least one reinforcement member comprises a bore opening outwardly of the guide cylinder, and a plug arranged to close the bore. These arrangements allow final balancing of the cylinder when the tubular sections which constitute the outer shell have been put in place, which inevitably results in a very slight unbalance which must be compensated, despite the balancing of the internal structure of the cylinder prior to the welding of the tubular sections.

Selon une alternative de l'invention, la virole externe pourrait être formée à partir d'une seule tôle de longueur appropriée enroulée et dont les deux bords disposés en regard l'un de l'autre sont soudés entre eux. Selon une autre alternative, la virole externe pourrait être formée à partir d'un tube sans soudure de longueur appropriée.According to an alternative of the invention, the outer shell could be formed from a single sheet of appropriate length wound and whose two edges arranged opposite one another are welded together. According to another alternative, the outer shell could be formed from a seamless tube of appropriate length.

Selon un mode de réalisation de l'invention, chacun des premier et deuxième arbres de support comportent une portion de montage montée à l'intérieur de l'élément d'extrémité respectif, et une portion de support faisant saillie à l'extérieur de l'élément d'extrémité respectif.According to one embodiment of the invention, each of the first and second support shafts has a mounting portion mounted within the respective end member, and a support portion projecting from the outside of the housing. respective end element.

De préférence, les premier et deuxième éléments d'extrémité s'étendent sensiblement coaxialement à l'axe du cylindre de guidage.Preferably, the first and second end members extend substantially coaxially with the axis of the guide cylinder.

Selon un mode de réalisation de l'invention, chacun des premier et deuxième éléments d'extrémité présente une forme tubulaire et s'étend sur une partie de la longueur du cylindre de guidage.According to one embodiment of the invention, each of the first and second end members has a tubular shape and extends over a portion of the length of the guide cylinder.

Chacun des premier et deuxième éléments d'extrémité présente de préférence un diamètre extérieur constant. Chacun des premier et deuxième éléments d'extrémité présente une longueur par exemple comprise entre 500 et 1000 mm.Each of the first and second end members preferably has a constant outer diameter. Each of the first and second end members has a length for example between 500 and 1000 mm.

Selon une alternative de l'invention, chacun des premier et deuxième éléments d'extrémité pourrait présentée une forme de disque.According to an alternative of the invention, each of the first and second end members could have a disk shape.

Avantageusement, chacun des premier et deuxième éléments d'extrémité présente une section extérieure circulaire.Advantageously, each of the first and second end members has a circular outer section.

Les premier et deuxième arbres de support s'étendent avantageusement sensiblement coaxialement à l'axe du cylindre de guidage.The first and second support shafts advantageously extend substantially coaxially with the axis of the guide cylinder.

Selon un mode de réalisation de l'invention, le cylindre de guidage comprend une première et une deuxième plaques d'extrémité s'étendant transversalement à l'axe du cylindre de guidage, les premier et deuxième arbres de support faisant saillie respectivement à travers les première et deuxième plaques d'extrémité. Les première et deuxième plaques d'extrémité sont de préférence fixées respectivement aux première et deuxième extrémités de la virole externe.According to one embodiment of the invention, the guide cylinder comprises a first and a second end plate extending transversely to the axis of the guide cylinder, the first and second support shafts protruding respectively through the first and second end plates. The first and second end plates are preferably fixed respectively to the first and second ends of the outer shell.

Selon un mode de réalisation de l'invention, le cylindre de guidage comprend un volume interne, et chacun des premier et deuxième arbres de support comprend un passage d'écoulement agencé pour mettre en communication le volume interne avec l'extérieur du cylindre de guidage.According to one embodiment of the invention, the guiding cylinder comprises an internal volume, and each of the first and second shafts of support comprises a flow passage arranged to put in communication the internal volume with the outside of the guide cylinder.

De façon préférentielle, le premier arbre de support comporte une buse de pulvérisation.Preferably, the first support shaft comprises a spray nozzle.

La présente invention concerne en outre un ensemble de refroidissement, caractérisé en ce qu'il comprend un cylindre de guidage selon l'invention, des moyens d'alimentation reliés au passage d'écoulement du premier arbre de support et agencés pour alimenter en fluide caloporteur le volume interne, et des moyens de refoulement reliés au passage d'écoulement du deuxième arbre de support et agencés pour refouler le fluide caloporteur contenu dans le volume interne à l'extérieur du cylindre de guidage.The present invention further relates to a cooling assembly, characterized in that it comprises a guide cylinder according to the invention, supply means connected to the flow passage of the first support shaft and arranged to supply heat transfer fluid the internal volume, and discharge means connected to the flow passage of the second support shaft and arranged to discharge the heat transfer fluid contained in the internal volume outside the guide cylinder.

De préférence, les moyens de refoulement comportent des moyens d'aspiration, tels qu'un ventilateur, agencés pour aspirer le liquide caloporteur contenu dans le volume interne à l'extérieur du cylindre de guidage. Avantageusement, les moyens d'aspiration sont agencés pour générer une dépression dans le volume interne.Preferably, the discharge means comprise suction means, such as a fan, arranged to suck the coolant contained in the internal volume outside the guide cylinder. Advantageously, the suction means are arranged to generate a depression in the internal volume.

Les moyens d'alimentation sont de préférence agencés pour alimenter le volume interne en eau, et plus particulièrement en brouillard d'eau pulvérisée.The feeding means are preferably arranged to supply the internal volume with water, and more particularly with water spray mist.

De toute façon l'invention sera bien comprise à l'aide de la description qui suit en référence au dessin schématique annexé représentant, à titre d'exemples non limitatifs, plusieurs formes d'exécution de ce cylindre de guidage.

  • Figure 1 est une vue en perspective d'un cylindre de guidage selon une première forme d'exécution de l'invention.
  • Figures 2 à 4 sont des vues en perspective du cylindre de guidage de la figure 1 dans différentes étapes fabrication.
  • Figure 5 est une vue en perspective, à l'échelle agrandie, d'un détail de la figure 2.
  • Figure 6 est une vue en perspective, à l'échelle agrandie, d'un détail de la figure 3.
  • Figure 7 est une vue en perspective, à l'échelle agrandie, d'un détail de la figure 2.
  • Figure 8 est une vue partielle de côté, à l'échelle agrandie, d'un détail de la figure 3.
  • Figure 9 est une vue partielle en perspective d'un cylindre de guidage selon une deuxième forme d'exécution de l'invention.
  • Figure 10 est une vue partielle en perspective d'un cylindre de guidage selon une troisième forme d'exécution de l'invention.
  • Figure 11 est une vue partielle en coupe d'un cylindre de guidage selon une quatrième forme d'exécution de l'invention.
  • Les figures 1 à 8 représentent un cylindre de guidage 2 d'un film en matière synthétique. Un tel cylindre de guidage 2 est plus particulièrement destiné à être intégré à une ligne de production d'un film en matière synthétique, notamment un film bi-orienté.
In any case the invention will be better understood from the following description with reference to the attached schematic drawing showing, by way of non-limiting examples, several embodiments of this guide cylinder.
  • Figure 1 is a perspective view of a guide cylinder according to a first embodiment of the invention.
  • Figures 2 to 4 are perspective views of the guide cylinder of the figure 1 in different stages manufacturing.
  • Figure 5 is a perspective view, on an enlarged scale, of a detail of the figure 2 .
  • Figure 6 is a perspective view, on an enlarged scale, of a detail of the figure 3 .
  • Figure 7 is a perspective view, on an enlarged scale, of a detail of the figure 2 .
  • Figure 8 is a partial side view, on an enlarged scale, of a detail of the figure 3 .
  • Figure 9 is a partial perspective view of a guide cylinder according to a second embodiment of the invention.
  • Figure 10 is a partial perspective view of a guide cylinder according to a third embodiment of the invention.
  • Figure 11 is a partial sectional view of a guide cylinder according to a fourth embodiment of the invention.
  • The Figures 1 to 8 represent a guide cylinder 2 of a film of synthetic material. Such a guide cylinder 2 is more particularly intended to be integrated in a production line of a film of synthetic material, in particular a bi-oriented film.

Comme montré sur la figure 1, le cylindre de guidage 2 comprend une virole externe 3 cylindrique, et deux plaques d'extrémité 4 s'étendant transversalement à l'axe du cylindre de guidage et fixées respectivement aux extrémités de la virole externe 3.As shown on the figure 1 , the guide cylinder 2 comprises a cylindrical outer ring 3, and two end plates 4 extending transversely to the axis of the guide cylinder and respectively fixed to the ends of the outer shell 3.

Le cylindre de guidage 2 comprend en outre deux arbres de support 5 s'étendant coaxialement à l'axe du cylindre de guidage et faisant saillie respectivement à travers les plaques d'extrémité 4.The guide cylinder 2 further comprises two support shafts 5 extending coaxially with the axis of the guide cylinder and projecting respectively through the end plates 4.

Comme montré sur les figures 2 et 5, le cylindre de guidage 2 comprend également deux éléments d'extrémité 6 tubulaires montés à l'intérieur de la virole externe 3, et disposés respectivement au niveau des extrémités de la virole externe 3. Les deux éléments d'extrémité 6 s'étendent sensiblement coaxialement à l'axe du cylindre de guidage et sur une partie de la longueur du cylindre de guidage. Chaque élément d'extrémité 6 présente une longueur par exemple comprise entre 500 et 1000 mm. Chaque élément d'extrémité 6 présente de préférence une section extérieure circulaire et un diamètre extérieur constant.As shown on figures 2 and 5 , the guide cylinder 2 also comprises two tubular end elements 6 mounted inside the outer shell 3, and respectively disposed at the ends of the outer shell 3. The two end members 6 extend substantially coaxially with the axis of the guide cylinder and over a portion of the length of the guide cylinder. Each end element 6 has a length for example between 500 and 1000 mm. Each end member 6 preferably has a circular outer section and a constant outer diameter.

Chaque arbre de support 5 est monté sur l'un des éléments d'extrémité 6. Chaque arbre de support 5 comporte plus particulièrement une portion de montage 5a montée à l'intérieur de l'élément d'extrémité 6 respectif, et une portion de support 5b faisant saillie à l'extérieur de l'élément d'extrémité 6 respectif. Afin d'assurer une liaison solide entre chaque arbre de support 5 et l'élément d'extrémité 6 respectif, la portion de montage 5a de chaque arbre de support 5 présente un diamètre extérieure légèrement supérieur au diamètre interne de l'élément d'extrémité 6 respectif. L'assemblage d'un arbre de support 5 et de l'élément d'extrémité 6 respectif comprend une première étape consistant à chauffer l'élément d'extrémité 6 à haute température de telle sorte qu'il se dilate et que son diamètre interne augmente, et une deuxième étape consistant à emmancher l'élément d'extrémité 6 autour de la portion de montage 5a de l'arbre de support 5 respectif, avant que l'élément d'extrémité 6 ne refroidisse. Cet assemblage peut éventuellement comporter une étape additionnelle consistant à souder l'arbre de support 5 sur l'élément d'extrémité 6 respectif.Each support shaft 5 is mounted on one of the end members 6. Each support shaft 5 more particularly comprises a mounting portion 5a mounted inside the respective end member 6, and a portion of 5b support projecting outside the respective end member 6. In order to ensure a solid connection between each support shaft 5 and the respective end element 6, the mounting portion 5a of each support shaft 5 has an outer diameter slightly greater than the internal diameter of the end element. 6 respective. The assembly of a support shaft 5 and the respective end member 6 comprises a first step of heating the end member 6 at a high temperature such that it expands and its inner diameter increases, and a second step of fitting the end member 6 around the mounting portion 5a of the respective support shaft 5, before the end member 6 does not cool. This assembly may optionally include an additional step of welding the support shaft 5 on the respective end member 6.

Le cylindre de guidage 2 comprend en outre une pluralité de profilés de renfort 7 longitudinaux s'étendant sensiblement parallèlement à l'axe du cylindre de guidage 2 et présentant une longueur correspondant sensiblement à celle de la virole externe 3. Les profilés de renfort 7 sont de préférence métalliques, et peuvent être réalisés par exemple en acier. Les profilés de renfort 7 présentent avantageusement une épaisseur comprise entre 1 et 5 mm.The guide cylinder 2 further comprises a plurality of longitudinal reinforcing profiles 7 extending substantially parallel to the axis of the guide cylinder 2 and having a length substantially corresponding to that of the outer shell 3. The reinforcing profiles 7 are preferably metal, and may be made for example of steel. The reinforcing profiles 7 advantageously have a thickness of between 1 and 5 mm.

Les portions d'extrémité de chaque profilé de renfort 7 sont fixées, de préférence par soudure, respectivement sur les deux éléments d'extrémité 6. Les profilés de renfort 7 sont régulièrement répartis sur le pourtour des deux éléments d'extrémité 6 et forment un support léger et rigide pour la virole externe 3. Le cylindre de guidage 2 comporte de préférence au moins quatre profilés de renfort 7, et par exemple jusqu'à trente-six profilés de renfort 7. Selon le mode de réalisation représenté aux figures, le cylindre de guidage 2 comporte douze profilés de renfort 7.The end portions of each reinforcing section 7 are fixed, preferably by welding, respectively to the two end members 6. The reinforcing profiles 7 are evenly distributed around the periphery of the two end elements 6 and form a light support and rigid for the outer shell 3. The guide cylinder 2 preferably comprises at least four reinforcing profiles 7, and for example up to thirty-six reinforcing profiles 7. According to the embodiment shown in the figures, the guide cylinder 2 comprises twelve reinforcing profiles 7.

Selon un mode de réalisation représenté sur les figures 5 à 7, chaque profilé de renfort 7 est plat et s'étend radialement par rapport à l'axe du cylindre de guidage 2.According to an embodiment shown on the Figures 5 to 7 each reinforcing section 7 is flat and extends radially with respect to the axis of the guide cylinder 2.

Cependant, selon deux autres modes de réalisation représentés sur les figures 9 et 10, chaque profilé de renfort 7 pourrait également présenter une section transversale en L ou en U. Selon ces deux modes de réalisation, chaque profilé de renfort 7 présente avantageusement une portion de fixation 7a longitudinale plate fixée sur les deux éléments d'extrémité 6.However, according to two other embodiments represented on the Figures 9 and 10 each reinforcing section 7 could also have an L-shaped or U-shaped cross section. According to these two embodiments, each reinforcing profile 7 advantageously has a flat longitudinal attachment portion 7a fixed on the two end elements 6.

Le cylindre de guidage 2 comprend en outre une pluralité d'organes de renfort 8 annulaires sur lesquels sont montés les profilés de renfort 7. Les organes de renfort 8 sont disposés entre les deux éléments d'extrémité 6, et sont décalés axialement les uns par rapport aux autres. Les organes de renfort 8 sont de préférence régulièrement espacés les uns des autres. Chaque organe de renfort 8 présente avantageusement une forme de disque.The guide cylinder 2 further comprises a plurality of annular reinforcing members 8 on which the reinforcing profiles 7 are mounted. The reinforcing members 8 are arranged between the two end elements 6, and are axially offset by one another. compared to others. The reinforcing members 8 are preferably regularly spaced from each other. Each reinforcing member 8 advantageously has a disc shape.

Selon un mode de réalisation représenté sur les figures 2 et 7, chaque organe de renfort 8 comporte avantageusement une pluralité d'encoches 9 dans chacune desquelles est engagé l'un des profilés de renfort 7. Les encoches 9 débouchent radialement vers l'extérieur et présente une profondeur correspondant sensiblement à la largeur des profilés de renfort 7.According to an embodiment shown on the figures 2 and 7 each reinforcement member 8 advantageously comprises a plurality of notches 9 in each of which is engaged one of the reinforcing profiles 7. The notches 9 open radially outwards and has a depth corresponding substantially to the width of the reinforcing profiles 7.

Selon un mode de réalisation non représenté sur les figures, chaque organe de renfort 8 est dépourvu d'encoche et présente avantageusement une surface extérieure cylindrique sur laquelle sont fixés, de préférence par soudure, les profilés de renfort 7, et plus particulièrement les portions de fixation 7a des profilés de renfort 7 lorsque ces derniers présentent une section en U ou en L.According to one embodiment not shown in the figures, each reinforcing member 8 is devoid of a notch and advantageously has a cylindrical outer surface on which are fixed, preferably by welding, the reinforcing profiles 7, and more particularly the portions of fixing 7a reinforcement profiles 7 when the latter have a section U or L.

Comme montrés sur les figures 3 et 4, la virole externe 3 est formée par une pluralité de tronçons tubulaires 10 alignés axialement et montés autour des profilés de renfort 7 de telle sorte que la paroi intérieure de chaque tronçon tubulaire 10 coopère avec les profilés de renfort 7. La virole externe 3 est par exemple formée par quatre tronçons tubulaires 10 disposés sensiblement bout à bout. Chaque tronçon tubulaire 10 est avantageusement formé à partir d'une tôle plane de longueur appropriée enroulée dont les deux bords disposés en regard l'un de l'autre sont soudés entre eux. Chaque tronçon tubulaire 10 peut être réalisé par exemple en acier inoxydable ou en acier au carbone.As shown on figures 3 and 4 , the outer shell 3 is formed by a plurality of axially aligned tubular sections 10 and mounted around the reinforcing profiles 7 so that the inner wall of each tubular section 10 cooperates with the reinforcing profiles 7. The outer shell 3 is example formed by four tubular sections 10 arranged substantially end to end. Each tubular section 10 is advantageously formed from a flat sheet of appropriate length wound whose two edges arranged opposite one another are welded together. Each tubular section 10 may be made for example of stainless steel or carbon steel.

Les tronçons tubulaires 10 s'étendent sensiblement coaxialement à l'axe du cylindre de guidage 2 et présentent une section extérieure circulaire. Chaque tronçon tubulaire 10 présente de façon avantageuse des diamètres intérieur et extérieur sensiblement constants.The tubular sections 10 extend substantially coaxially with the axis of the guide cylinder 2 and have a circular outer section. Each tubular section 10 advantageously has substantially constant inner and outer diameters.

Les deux tronçons tubulaires 10 disposés aux extrémités de la virole externe 3 présentent avantageusement une première extrémité fixée sur l'un des éléments d'extrémité 6 et une deuxième extrémité fixée sur l'un des organes de renfort 8. Les extrémités des deux tronçons tubulaires 10 disposés au centre de la virole externe 3 sont fixées respectivement sur un organe de renfort 8 respectif. La fixation des extrémités des tronçons tubulaires 10 sur les organes de renfort 8 respectif est de préférence réalisée par soudure.The two tubular sections 10 disposed at the ends of the outer shell 3 advantageously have a first end attached to one of the end members 6 and a second end attached to one of the reinforcing members 8. The ends of the two tubular sections 10 arranged in the center of the outer shell 3 are respectively fixed on a respective reinforcing member 8. Fixing the ends of the tubular sections 10 on the respective reinforcing members 8 is preferably made by welding.

Selon une variante de réalisation représentée sur la figure 11, chaque organe de renfort 8 comporte une première gorge annulaire 8a agencée pour recevoir l'extrémité d'un tronçon tubulaire 10 adjacent, et une deuxième gorge 8b annulaire, opposée à la première gorge annulaire 8a, agencée pour recevoir l'extrémité d'un tronçon tubulaire 10 adjacent. Chaque organe de renfort 8 présente une portion intermédiaire 8c disposée entre les première et deuxième gorges 8a, 8b. La portion intermédiaire 8c délimite une surface externe cylindrique s'étendant sensiblement dans la continuité des surfaces externes des tronçons tubulaires 10 adjacents. Ainsi, la portion intermédiaire 8c de chaque organe de renfort 8 délimite en partie la virole externe 3.According to an alternative embodiment represented on the figure 11 each reinforcing member 8 comprises a first annular groove 8a arranged to receive the end of an adjacent tubular section 10, and a second annular groove 8b, opposite to the first annular groove 8a, arranged to receive the end of an adjacent tubular section. Each reinforcing member 8 has an intermediate portion 8c disposed between the first and second grooves 8a, 8b. The intermediate portion 8c delimits a cylindrical outer surface extending substantially in continuity with the external surfaces of the adjacent tubular sections 10. Thus, the intermediate portion 8c of each reinforcing member 8 defines part of the outer shell 3.

La portion intermédiaire 8c de chaque organe de renfort 8 peut avantageusement comporter un alésage 11 débouchant vers l'extérieur du cylindre de guidage 2, et un bouchon 12 agencé pour obturer l'alésage 11. Ces dispositions permettent, si nécessaire, d'usiner l'intérieur de l'organe de renfort 8 de manière à diminuer la masse de ce dernier afin d'équilibrer le cylindre de guidage 2. Le bouchon 12 peut par exemple comporter un filetage agencé pour coopérer avec un taraudage ménagé sur l'organe de renfort 8.The intermediate portion 8c of each reinforcing member 8 may advantageously comprise a bore 11 opening towards the outside of the guide cylinder 2, and a plug 12 arranged to seal the bore 11. These arrangements make it possible, if necessary, to machine the inside the reinforcing member 8 so as to reduce the mass of the latter in order to balance the guide cylinder 2. The cap 12 may for example comprise a thread arranged to cooperate with a tapping formed on the reinforcing member 8.

Les différents tronçons tubulaires 10, les profilés de renfort 7, les organes de renfort 8 et les éléments d'extrémité 6 délimitent un volume interne 13 adapté pour la circulation d'un fluide caloporteur. Avantageusement, lorsque le cylindre de guidage 2 est un cylindre de refroidissement, chaque arbre de support 5 comprend un passage d'écoulement 14 axial débouchant d'une part dans le volume interne 13 et d'autre part à l'extrémité libre de la portion de support 5b respective.The various tubular sections 10, the reinforcing sections 7, the reinforcing members 8 and the end members 6 define an internal volume 13 adapted for the circulation of a coolant. Advantageously, when the guide cylinder 2 is a cooling cylinder, each support shaft 5 comprises an axial flow passage 14 opening on the one hand in the internal volume 13 and on the other hand at the free end of the portion 5b respective support.

La figure 12 représente un ensemble de refroidissement 15 comprenant un cylindre de guidage 2 selon l'invention, des moyens d'alimentation 16 reliés au passage d'écoulement 14 de l'un des arbres de support 5 et agencés pour alimenter en fluide caloporteur le volume interne 13, et des moyens de refoulement 17 reliés au passage d'écoulement 14 de l'autre arbre de support 5 et agencés pour refouler le fluide caloporteur contenu dans le volume interne 13 à l'extérieur du cylindre de guidage 2.The figure 12 represents a cooling assembly 15 comprising a guiding cylinder 2 according to the invention, supply means 16 connected to the flow passage 14 of one of the support shafts 5 and arranged to supply heat transfer fluid to the internal volume 13 , and discharge means 17 connected to the flow passage 14 of the other support shaft 5 and arranged to discharge the coolant contained in the internal volume 13 outside the guide cylinder 2.

Les moyens d'alimentation 16 sont de préférence agencés pour alimenter le volume interne 13 en eau, et notamment en brouillard d'eau pulvérisée. Selon un mode de réalisation non représenté sur les figures, l'arbre de support 5 relié aux moyens d'alimentation 16 comporte une buse de pulvérisation.The feed means 16 are preferably arranged to supply the internal volume 13 with water, and especially with water spray mist. According to an embodiment not shown in the figures, the support shaft 5 connected to the supply means 16 comprises a spray nozzle.

Le brouillard d'eau introduit dans le volume interne 13 est destiné à circuler, du fait de la force centrifuge résultant de la rotation du cylindre de guidage, le long de la paroi intérieure de la virole externe 3, et plus particulièrement des tronçons tubulaire 10, ce qui permet de maintenir la virole externe à faible température, et donc de refroidir le film au contact de la virole externe.The water mist introduced into the internal volume 13 is intended to circulate, because of the centrifugal force resulting from the rotation of the guide cylinder, along the inner wall of the outer shell 3, and more particularly tubular sections 10, which allows to maintain the outer ring at low temperature, and thus to cool the film in contact with the outer shell.

De préférence, les moyens de refoulement 17 comportent des moyens d'aspiration, tels qu'un ventilateur, agencés pour aspirer le brouillard d'eau contenu dans le volume interne 13 à l'extérieur du cylindre de guidage. Avantageusement, les moyens d'aspiration sont agencés pour générer une dépression dans le volume interne. Une telle dépression permet de favoriser la vaporisation de l'eau contenue dans le volume interne 13, et donc d'améliorer l'échange thermique entre l'eau et la virole, mais également de réduire la température de vaporisation de l'eau, réduisant ainsi la température de la virole externe.Preferably, the discharge means 17 comprise suction means, such as a fan, arranged to suck the water mist contained in the internal volume 13 outside the guide cylinder. Advantageously, the suction means are arranged to generate a depression in the internal volume. Such a depression makes it possible to promote the vaporization of the water contained in the internal volume 13, and therefore to improve the heat exchange between the water and the ferrule, but also to reduce the vaporization temperature of the water, reducing thus the temperature of the outer shell.

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de ce cylindre de guidage, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes de réalisation.As goes without saying, the invention is not limited to the embodiments of this guide cylinder, described above as examples, it encompasses all the variants.

Claims (11)

Cylindre de guidage (2) d'un film, comprenant : - une virole externe (3) comprenant une première portion d'extrémité et une deuxième portion d'extrémité opposée à la première portion d'extrémité, - un premier et un deuxième éléments d'extrémité (6) montés respectivement dans les première et deuxième portions d'extrémité de la virole externe (3), - un premier et un deuxième arbres de support (5) montés respectivement sur les premier et deuxième éléments d'extrémité (6), caractérisé en ce que le cylindre de guidage (2) comprend en outre une pluralité de profilés de renfort (7) longitudinaux reliant les premier et deuxième éléments d'extrémité et fixés chacun respectivement sur les premier et deuxième éléments d'extrémité (6), les profilés de renfort (7) étant répartis sur le pourtour des premier et deuxième éléments d'extrémité (6) et formant un support pour la virole externe (3).A guiding cylinder (2) for a film, comprising: an outer shell (3) comprising a first end portion and a second end portion opposite to the first end portion, a first and a second end element (6) mounted respectively in the first and second end portions of the outer shell (3), a first and a second support shafts (5) mounted respectively on the first and second end members (6), characterized in that the guide cylinder (2) further comprises a plurality of longitudinal reinforcing profiles (7) connecting the first and second end members and each respectively fixed to the first and second end members (6), the reinforcing profiles (7) being distributed around the periphery of the first and second end elements (6) and forming a support for the outer shell (3). Cylindre de guidage selon la revendication 1, lequel comprend au moins un organe de renfort (8) disposé entre les premier et deuxième éléments d'extrémité (6) et sur lequel sont montés les profilés de renfort (7).Guiding cylinder according to claim 1, which comprises at least one reinforcing member (8) disposed between the first and second end members (6) and on which the reinforcement profiles (7) are mounted. Cylindre de guidage selon la revendication 2, dans lequel au moins un organe de renfort (8) comporte une pluralité d'encoches (9) dans chacune desquelles est engagé l'un des profilés de renfort (7).Guiding cylinder according to claim 2, wherein at least one reinforcing member (8) has a plurality of notches (9) in each of which is engaged one of the reinforcing profiles (7). Cylindre de guidage selon l'une des revendications 1 à 3, dans lequel la virole externe (3) comporte une pluralité de tronçons tubulaires (10) alignés axialement et montés autour des profilés de renfort (7) de telle sorte que la paroi intérieure de chaque tronçon tubulaire (10) coopère avec les profilés de renfort (7).Guiding cylinder according to one of claims 1 to 3, wherein the outer shell (3) comprises a plurality of axially aligned tubular sections (10) and mounted around the reinforcing profiles (7) so that the inner wall of each tubular section (10) cooperates with the reinforcing profiles (7). Cylindre de guidage selon la revendication 4, dans lequel au moins l'une des extrémités de chaque tronçon tubulaire (10) est fixée sur un organe de renfort (8).A guide cylinder according to claim 4, wherein at least one of the ends of each tubular section (10) is attached to a reinforcing member (8). Cylindre de guidage selon la revendication 4 ou 5, dans lequel au moins un organe de renfort (8) comporte une première gorge annulaire (8a) agencée pour recevoir l'extrémité d'un premier tronçon tubulaire (10), et une deuxième gorge annulaire (8b), opposée à la première gorge annulaire (8a), agencée pour recevoir l'extrémité d'un deuxième tronçon tubulaire (10).Guiding cylinder according to claim 4 or 5, wherein at least one reinforcing member (8) has a first annular groove (8a) arranged to receive the end of a first tubular section (10), and a second annular groove (8b), opposite the first annular groove (8a), arranged to receive the end of a second tubular section (10). Cylindre de guidage selon l'une des revendications 1 à 6, dans lequel chacun des premier et deuxième éléments d'extrémité (6) présente une forme tubulaire et s'étend sur une partie de la longueur du cylindre de guidage (2).A guide cylinder according to one of claims 1 to 6, wherein each of the first and second end members (6) has a tubular shape and extends over a portion of the length of the guide cylinder (2). Cylindre de guidage selon l'une des revendications 1 à 7, dans lequel chacun des premier et deuxième arbres de support (5) comporte une portion de montage (5a) montée à l'intérieur de l'élément d'extrémité (6) respectif, et une portion de support (5b) faisant saillie à l'extérieur de l'élément d'extrémité (6) respectif.Guiding cylinder according to one of claims 1 to 7, wherein each of the first and second support shafts (5) has a mounting portion (5a) mounted within the respective end member (6). and a support portion (5b) projecting outwardly from the respective end member (6). Cylindre de guidage selon l'une des revendications 1 à 8, lequel comprend une première et une deuxième plaques d'extrémité (4) s'étendant transversalement à l'axe du cylindre de guidage, les premier et deuxième arbres de support (5) faisant saillie respectivement à travers les première et deuxième plaques d'extrémité (4).Guiding cylinder according to one of claims 1 to 8, which comprises a first and a second end plate (4) extending transversely to the axis of the guide cylinder, the first and second support shafts (5) protruding respectively through the first and second end plates (4). Cylindre de guidage selon l'une des revendications 1 à 9, lequel comprend un volume interne (13), et dans lequel chacun des premier et deuxième arbres de support (5) comprend un passage d'écoulement (14) agencé pour mettre en communication le volume interne (13) avec l'extérieur du cylindre de guidage (2).A guide cylinder according to one of claims 1 to 9, which comprises an internal volume (13), and wherein each of the first and second support shafts (5) comprises a flow passage (14) arranged to port the internal volume (13) with the outside of the guide cylinder (2). Ensemble de refroidissement (15), caractérisé en ce qu'il comprend un cylindre de guidage (2) selon la revendication 10, des moyens d'alimentation (16) reliés au passage d'écoulement (14) du premier arbre de support (5) et agencés pour alimenter en fluide caloporteur le volume interne (13), et des moyens de refoulement (17) reliés au passage d'écoulement (14) du deuxième arbre de support (5) et agencés pour refouler le fluide caloporteur contenu dans le volume interne (13) à l'extérieur du cylindre de guidage (2).Cooling unit (15), characterized in that it comprises a guide cylinder (2) according to claim 10, supply means (16) connected to the flow passage (14) of the first support shaft (5). ) and arranged to supply heat transfer fluid to the internal volume (13), and discharge means (17) connected to the flow passage (14) of the second support shaft (5) and arranged to discharge the heat transfer fluid contained in the internal volume (13) outside the guide cylinder (2).
EP13152997.6A 2012-02-04 2013-01-29 Film guiding cylinder Active EP2623446B1 (en)

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KR102606854B1 (en) * 2022-11-22 2023-11-24 재단법인 한국섬유기계융합연구원 Induction heating roll with modular prefabricated outer cylinder

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CN103241576A (en) 2013-08-14
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JP2013231504A (en) 2013-11-14
EP2623446B1 (en) 2017-03-15

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