EP3784066B1 - Tube multicouche de l'industrie du tabac et procédé de fabrication du tube multicouche - Google Patents

Tube multicouche de l'industrie du tabac et procédé de fabrication du tube multicouche Download PDF

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Publication number
EP3784066B1
EP3784066B1 EP19726750.3A EP19726750A EP3784066B1 EP 3784066 B1 EP3784066 B1 EP 3784066B1 EP 19726750 A EP19726750 A EP 19726750A EP 3784066 B1 EP3784066 B1 EP 3784066B1
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European Patent Office
Prior art keywords
web
layer
folding
layers
longitudinal
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EP19726750.3A
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German (de)
English (en)
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EP3784066A1 (fr
Inventor
Marco Esposti
Ivan Eusepi
Eros Stivani
Giuliano Gamberini
Luca Federici
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GD SpA
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GD SpA
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/46—Making paper tubes for cigarettes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31C5/00—Making tubes or pipes without using mandrels

Definitions

  • This invention relates to a multilayer tube of the tobacco industry and to a method for making it.
  • tube-shaped elements of paper material in particular for use as components of "HNB” (heat-not-burn) cigarettes.
  • HNB heat-not-burn
  • the tube-shaped elements are made by superposing and gluing two paper webs in such a way as to obtain, on one or both of the longitudinal edges, suitable joining zones intended to be spliced to each other to form a tube-like configuration.
  • the two webs are offset during superposing and gluing, so that, when the tube is formed, the splices between the corresponding end edges of the two layers are angularly spaced from each other about the axis of the tube itself.
  • Two-layer tubes known in the art are disclosed by GB1538452 and GB1556728 . These tubes are formed by longitudinally enfolding a two-layered web obtained by folding a web about a longitudinal folding line.
  • the basic technical purpose of this invention is to provide a multilayer tube of the tobacco industry, as well as a method for making it, to overcome the above mentioned disadvantages of the prior art.
  • this invention has for an aim to provide a multilayer tube of the tobacco industry, as well as a method for making it, capable of guaranteeing a high level of dimensional precision of the end product.
  • the object of this invention is a multilayer tube of the tobacco industry, which has an internally hollow cylindrical shape extending round a longitudinal axis and whose cross section transverse to the longitudinal axis has a multilayer thickness defined by at least three superposed layers, the tube being obtained by winding a (preferably flat) multilayer material around the longitudinal axis until juxtaposing and coupling to each other opposite lateral edges of the flat multilayer material, wherein the flat multilayer material is obtained by folding a single sheet or web about at least two fold lines parallel to the longitudinal axis to superpose corresponding longitudinal zones of the sheet or web and define the multilayer thickness.
  • the multilayer tube is obtained by cutting a continuous tube made from a continuous multilayer (three-layer) web.
  • the multilayer tube may be obtained from a multilayer (three-layer) sheet or piece of material which may in turn be obtained by cutting a continuous multilayer (three-layer) web.
  • the superposed layers of the tube extend along paths which are concentric about the longitudinal axis.
  • the concentric paths are defined by respective cylindrical surfaces of each layer and, in particular, the flat multilayer material is wound around the longitudinal axis "X" in such a way that mutually juxtaposing and coupling the opposite lateral edges of the flat multilayer material causes each layer to lie on a respective closed cylindrical positioning surface. That means the cylindrical positioning surfaces of the layers are concentric about the longitudinal axis. Thanks to this, in the splicing zone between the two lateral edges of the multilayer material, there is a "flush" join between the two lateral edges at least on the outside of the tube and preferably also on the inside of it. In other words, there is no step in the splicing zone on the outside, and preferably also on the inside, so as to obtain a circumferentially smooth tube.
  • each layer constitutes an extension of at least one adjacent layer.
  • the layers are defined by folding a single sheet or web and each layer of adjacent layers defines an extension of the other through a respective curvature/folding zone disposed on one side of, and parallel to, the longitudinal axis. That means the layers are not disposed spirally; in other words, the multilayer structure of the tube is not obtained by a spiral configuration of a single sheet or web.
  • the initial sheet or web has a single layer configuration and is made, for example, of paper material.
  • one of the layers has, along a first lateral edge of the multilayer web, a lateral border protruding from an adjacent layer, the protruding lateral border defining an element for joining the opposite lateral edges of the multilayer material so as to circumferentially close the tube.
  • the first protruding lateral border is a lateral border of the initial web from which the multilayer web was made.
  • the protruding lateral border defining the joining element has a single layer configuration and is defined by an extension of only one of the layers.
  • the multilayer web is provided, on the second lateral edge of it, opposite to and facing the first lateral edge, with a recess corresponding to the protruding lateral border so that the protruding lateral border is positioned in the recess, giving the tube a smooth, crease-free circular configuration at the zone where the lateral edges are spliced.
  • the cross section of the tube transverse to the longitudinal axis has a thickness defined by two superposed layers and the flat multilayer material is obtained by folding a single sheet or web about a fold line parallel to the longitudinal axis to superpose a pair of adjacent longitudinal zones of that sheet or web.
  • the cross section of the tube transverse to the longitudinal axis has a thickness defined by three superposed layers and the flat multilayer material is obtained by folding a single sheet or web about two fold lines parallel to the longitudinal axis to superpose corresponding longitudinal zones of that sheet or web, which are adjacent to each other and separated by those fold lines.
  • the multilayer material is obtained by folding a single sheet or web about the parallel fold lines in such a way that the layers follow each other along an S-shaped path, where the outer layers correspond to outer longitudinal areas of the sheet or web while the intermediate layer corresponds to a central longitudinal area of the sheet or web.
  • a first of the outer layers is larger in width than the intermediate layer to define a protruding lateral border defining an element for joining the opposite sides of the multilayer material so as to circumferentially close the tube.
  • the second outer layer is smaller in width than the intermediate layer and defines a retracted edge behind a folding and splicing zone between the other two layers and the folding and splicing zone adopts, in that tube, a deformed, double notch configuration (that is to say, an inner notch and an outer notch) to define, on one side, a recessed zone designed to receive the protruding lateral border of the first outer layer and, on the other side, a relief feature designed to be aligned with the second outer layer.
  • a deformed, double notch configuration that is to say, an inner notch and an outer notch
  • the multilayer material is obtained by folding a single sheet or web about the parallel fold lines in such a way that the layers follow each other along a spiral path, where the outer layers correspond to a first outer longitudinal area and a central longitudinal area of the sheet or web, respectively, while the intermediate layer corresponds to a second outer longitudinal area of the sheet or web.
  • the central layer is smaller in width than the outer layers so that the free inner edge of the central layer is spaced from the fold line between the outer layers to define a recessed zone of a first of the outer layers; the first outer layer having, on the side opposite to the recessed zone, a protruding lateral border coupled to the recessed zone of the first layer to define an element for joining the opposite sides of the multilayer material so as to circumferentially close the tube.
  • the first layer may define the innermost layer of the three-layer tube.
  • the first layer may define the outermost layer of the three-layer tube.
  • the layers are permanently connected to each other by applying an adhesive substance, specifically according to a predetermined pattern and preferably by applying an uninterrupted layer of glue.
  • the adhesive substance is applied between each pair of adjacent layers in such a way that the multilayer structure is defined before winding around the longitudinal axis to define the tube, which will adopt a stable configuration after being formed and when the glue dries.
  • the joining element too, is used to close the tube made from the multilayer web by means of a line or layer of glue (laminating glue).
  • the glue used to join the layers to each other and the glue used to fix the joining element may be different kinds of glue.
  • This invention also has for an object a method for making a multilayer tube of the tobacco industry and, in particular, a tube of the type described above.
  • the method comprises the steps of:
  • the step of folding the continuous web along the at least one first longitudinal fold line is carried out while the web is being fed.
  • folding means such as, for example, a progressively-acting, fixed diverter which folds a longitudinal band of the web against a fixed laminator such as, for example, a fixed plate.
  • the continuous web is folded about a single longitudinal fold line to obtain a two-layer web.
  • the continuous web is folded about two longitudinal fold lines to obtain a three-layer web.
  • the step of folding the continuous web is accomplished by folding the web a first time about a first longitudinal fold line and folding the web again about a second longitudinal fold line in such a way as to obtain a three-layer web, the first and second fold lines being parallel to each other and parallel to the feed direction of the continuous web.
  • the step of folding is accomplished by folding the web around at least one laminator, preferably a thin, longitudinal plate, so that the respective fold line is located at a respective longitudinal edge of the rigid laminator.
  • each step of folding is preceded by a step of making at least one longitudinal line of weakness to coincide with a respective longitudinal fold line during the step of folding.
  • This longitudinal line of weakness is operatively disposed at the respective longitudinal edge of the rigid laminator so as to maximize folding precision.
  • both of the fold lines are preferably located at respective longitudinal lines of weakness made previously by a single scoring tool, specifically a single scoring roller having at least two discs or ridges which are axially spaced from each other to make corresponding parallel lines of weakness (scores) on the web. This ensures obtaining an optimum geometry for folding the web to make the three-layer web.
  • the step of folding the web is accomplished by folding the web about the two fold lines in such a way that a central area of the web lying between the two fold lines defines the intermediate layer of the final three-layer web, while the remaining longitudinal areas of the web, which are on the outer sides of the two fold lines, define the outer layers of the three-layer web.
  • the layers follow each other along an S-shaped path.
  • a first of the outer layers is larger in width than the intermediate layer (perpendicularly to the direction of web extension or feed) to define a protruding lateral border defining an element for joining the opposite sides of the multilayer material so as to circumferentially close the tube.
  • the second outer layer is, in an embodiment, smaller in width than the intermediate layer and defines a retracted edge behind a folding and splicing zone between the other two layers and the step of winding the multilayer web includes a step of deforming the folding and splicing zone in such a way as to obtain a deformed, double notch configuration (that is to say, an inward facing notch and an outward facing notch) to define, on one side, a recessed zone designed to receive the protruding lateral border of the first outer layer and, on the other side, a relief feature designed to be aligned with the second outer layer.
  • a deformed, double notch configuration that is to say, an inward facing notch and an outward facing notch
  • the step of folding the web is accomplished by folding the web about the two fold lines in such a way that the outer layers of the three-layer web correspond, respectively, to a first outer longitudinal area and a central longitudinal area of the web, while the intermediate layer corresponds to a second outer longitudinal area of the three-layer web.
  • the layers follow each other along a spiral path.
  • a first of the outer layers is larger in width than the intermediate layer (perpendicularly to the direction of web extension or feed) to define a protruding lateral border defining an element for joining the opposite sides of the multilayer material so as to circumferentially close the tube to define a cavity.
  • the central layer is, in an embodiment, smaller in width than the outer layers so that the free inner edge of the central layer is spaced from the fold and splicing line between the outer layers.
  • the step of winding the multilayer web includes a step of deforming the three-layer web at the cavity by flattening to obtain a recessed zone, while one of the two outer layers has, on the side opposite to the recessed zone, a protruding lateral border coupled to the recessed zone of the first layer to define an element for joining the opposite sides of the three-layer material so as to circumferentially close the tube.
  • the recessed zone defined by flattening at the cavity produces a notch intended to receive the protruding lateral border so that after being wound into a tube, the tube has a smooth, regular, crease-free shape.
  • the outer layer defining the protruding lateral border may be the layer intended to be the outside layer of the tube or, alternatively, the layer intended to be the inside layer of the tube.
  • the step of folding the continuous web on itself about at least a first longitudinal fold line is associated with a step of applying adhesive, preferably an uninterrupted intermediate layer of adhesive, between adjacent layers of the multilayer web.
  • adhesive preferably an uninterrupted intermediate layer of adhesive
  • This layer of glue is applied on each superposed layer in order to stabilize the multilayer configuration of the web.
  • the initial web has a double width and is cut longitudinally into two juxtaposed webs which are then offset in a direction transverse to the position plane of the initial web (that is to say, by raising one of the two webs relative to the other). In this situation, the two webs are each folded according to the process described above to obtain two multilayer webs that are preferably identical.
  • Figure 1 shows a cross section of a first embodiment of a tube according to this invention, denoted by the reference numeral 1.
  • the tube 1 has an internally hollow, cylindrical shape which extends around a longitudinal axis "X" and whose cross section transverse to the longitudinal axis "X" has a three-layer thickness defined by three superposed layers, specifically an outside layer 2, an intermediate layer 3 and an inside layer 4.
  • the superposed layers 2, 3, 4 extend along paths which are concentric to each other.
  • the tube 1 is obtained by winding a flat, three-layer material 100 ( Figure 3 ) around the longitudinal axis "X" until juxtaposing and coupling to each other opposite lateral edges 110, 120 of the flat multilayer material 100.
  • the flat, three-layer material 100 is in turn obtained by folding a single sheet or web 50 about a first fold line "P1" and a second fold line "P2", which are parallel to each other and to the longitudinal axis "X”, in such a way as to mutually superpose corresponding longitudinal areas of the sheet or web 50 to define the three-layer material.
  • the inner and outer layers 2, 4 correspond to longitudinal outside areas of the sheet or web 50
  • the intermediate layer 3 corresponds to a longitudinal, central area of the sheet or web 50.
  • the multilayer material 100 is obtained by folding the sheet or web 50 about the two fold lines "P1 ", "P2" in such a way that the layers 2, 3, 4 follow each other along an S-shaped path.
  • the initial sheet or web 50 preferably has a single layer configuration and is made, for example, of paper material.
  • the layers 2, 3, 4 of the three-layer material 100 are disposed in such a way that mutually adjacent layers are joined together along a respective folding zone extending parallel to the longitudinal axis "X" and integral with the adjacent layers in such a way that each layer constitutes an extension of at least one adjacent layer.
  • the end edges 110, 120 each have a respective folding zone between two adjacent layers 2, 3; 3, 4.
  • One of the layers specifically the inside layer 4 has, along a first lateral edge 110 of the multilayer web 100, a lateral border 5 protruding from the intermediate layer 3 to define an element for joining the opposite lateral edges 110, 120 of the multilayer material 100 so as to circumferentially close the tube 1.
  • the protruding border 5 has a single layer configuration and is defined by an extension of only one of the layers, specifically the inside layer 4 (or alternatively, in an equivalent embodiment not illustrated, the outside layer).
  • the opposite layer (specifically, the outside layer 2 in the configuration of Figures 1-4 ) is smaller in width than the intermediate layer 3 to define a retracted lateral edge 6 behind a folding and splicing zone between the other two layers 3, 4 (that is to say, behind the corresponding lateral edge 120).
  • the aforesaid folding and splicing zone associated with the retracted edge 6 adopts a deformed, double notch configuration ( Figures 1A-4 ) to define, on the inside, a recessed zone "R" designed to receive the protruding lateral border 5 of the inside layer 4 and, on the outside, a relief feature designed to be substantially aligned with the retracted edge 6 of the outside layer 2.
  • Figures 5-8 show a second embodiment of the tube 1 according to the invention.
  • This embodiment differs from the embodiment of Figures 1-4 in that the multilayer material 100 is obtained by folding a single sheet or web 50 about the two fold lines "P1", "P2" in such a way that the layers 2, 3, 4 follow each other along a spiral path.
  • the outer layers 2, 4 correspond to a first longitudinal outer area and to a longitudinal, central area of the sheet or web 50, respectively, whilst the intermediate layer 3 corresponds to a second longitudinal outer area of the sheet or web 50.
  • the intermediate layer 3 is smaller in width than the outer layers 2, 4 so that the free inner edge 7 of the central layer is spaced from the fold line "P2" between the outer layers 2, 4 (that is to say, from the corresponding lateral edge 120 of the three-layer material 100) to allow making a recessed zone "R" of a first of the outer layers 2, 4, where the latter has, on the side opposite to the recessed zone "R” a protruding lateral border 5 intended to be coupled to the recessed zone "R” to define an element for joining the opposite lateral edges 110, 120 of the multilayer material 100 so as to circumferentially close the tube 1.
  • the retracted edge 7 thanks to its distance from the respective folding zone, defines a cavity 8 which is interposed between the two outer layers 2, 4.
  • the cavity 8 defines a flattening zone where one of the two outer layers 2, 4 is deformed to create the recessed zone "R".
  • the recessed zone "R" and the protruding lateral border 5 are defined on the outside layer 2 of the tube 1. Under the protruding lateral border 5, the two folding zones of the other two layers 3, 4 are disposed close together or in abutment to enable closing the tube 1.
  • FIG. 9-12 differs from the embodiment of figures 5-8 in that the recessed zone "R" and the protruding lateral border 5 are defined on the inside layer 4 of the tube 1.
  • the two folding zones of the other two layers 2, 3 are disposed close together or in abutment to enable closing the tube 1.
  • the layers 2, 3, 4 are connected to each other by adhesive, preferably by an uninterrupted intermediate layer of adhesive or, alternatively, according to a specific, predetermined pattern.
  • the adhesive may be the same adhesive as that used to fix the protruding lateral border 5 or it may be a different type of adhesive.
  • Figure 13 shows a schematic view of a portion of a machine used for making the tube 1 and, specifically, for making the three-layer material 100.
  • the machine initially comprises a scoring tool 200 defined in particular by a pair of opposed rollers, at least one of which is provided with a pair of discs or ridges 210 which are axially spaced from each other to make corresponding parallel lines of weakness "L1", "L2" on the initial web 50.
  • the number of discs or ridges 210 depends on the number of lines of weakness to be made and hence on the number of layers of the multilayer material to be obtained and may therefore be different from two, as in the embodiments shown in the accompanying drawings.
  • the machine Downstream of the scoring tool 200, the machine comprises two laminating or folding elements 300, 400, each of which is intended to fold the web 50 along a corresponding fold line coinciding with one of the aforementioned lines of weakness "L1", "L2".
  • the two folding elements 300, 400 are disposed one after the other to make successive folds on the web 50.
  • each folding element 300, 400 has a rigid structure comprising a thin plate lying in a plane parallel to the web 50 so as to be interposed between two adjacent layers being formed.
  • each folding element 300, 400 has a shelf-like structure, supported on one side and having a suspended portion defining a respective folding edge 310, 410 intended to be exactly superposed on the respective fold line to define a laminator for folding the web 50.
  • each folding element 300, 400 may be associated with a corresponding fixed diverter for progressively flattening a longitudinal area of the web 50 over an adjacent longitudinal area while folding the web 50 around the fold lines.
  • the position and structure of the scoring tool 200 is determined in such a way as to make the lines of weakness "L1", “L2" (hence the fold lines) at the desired position, specifically in such a way as to make both the protruding lateral border of one of the two outer layers and the retracted edge of the inner layer.
  • the present invention achieves the preset aims, overcoming the disadvantages of the prior art.
  • making all the lines of weakness on the web using a single scoring tool allows planning the lines of weakness in advance according to an extremely precise predetermined geometry repeatable over time.

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Claims (23)

  1. Tube multicouche de l'industrie du tabac, ayant une forme cylindrique intérieurement creuse se prolongeant autour d'un axe longitudinal (X) et dont la section transversale transverse à l'axe longitudinal (X) possède une épaisseur multicouche définie par au moins trois couches superposées (2, 3, 4), caractérisé en ce qu'il est obtenu par enroulement d'un matériau multicouche plat (100) autour de l'axe longitudinal (X) jusqu'à juxtaposition et couplage l'un à l'autre des bords latéraux opposés (110, 120) du matériau multicouche plat (100), dans lequel le matériau multicouche plat (100) est obtenu en pliant une seule feuille ou bande (50) autour d'au moins deux lignes de pliage (P1, P2) parallèles à l'axe longitudinal (X) pour superposer des zones longitudinales correspondantes de la feuille ou de la bande (50) et définir l'épaisseur multicouche.
  2. Tube selon la revendication 1, dans lequel les couches superposées (2, 3, 4) se prolongent le long de trajectoires concentriques et dans lequel les couches mutuellement adjacentes (2, 3, 4) de l'épaisseur multicouche sont assemblées le long d'une zone de pliage se prolongeant parallèlement à l'axe longitudinal (X) et sont solidaires des couches adjacentes (2, 3, 4) de telle sorte que chaque couche (2, 3, 4) constitue une extension d'au moins une couche adjacente (2, 3, 4).
  3. Tube selon la revendication 2, dans lequel les trajectoires concentriques sont définies par des surfaces cylindriques respectives de chaque couche (2, 3, 4), le tube étant, en particulier, obtenu en enroulant le matériau multicouche plat (100) autour de l'axe longitudinal (X) de telle sorte que la juxtaposition et le couplage mutuels des bords latéraux opposés (110, 120) du matériau multicouche plat (100) amènent chaque couche (2, 3, 4) à reposer sur une surface de positionnement cylindrique fermée respective, les surfaces de positionnement cylindriques de la couche (2, 3, 4) étant concentriques autour de l'axe longitudinal (X) .
  4. Tube selon l'une quelconque des revendications précédentes, dans lequel la feuille ou la bande (50) possède une configuration à une seule couche et est fabriquée de préférence en papier.
  5. Tube selon l'une quelconque des revendications précédentes, dans lequel l'une des couches (2, 3, 4) comporte, le long d'un premier bord latéral (110, 120) de la bande multicouche (100), une bordure latérale (5) dépassant d'une couche adjacente (2, 3, 4), la bordure latérale en saillie (5) définissant un élément permettant de joindre les bords latéraux opposés (110, 120) du matériau multicouche (100) de manière à fermer le tube (1) de manière circonférentielle.
  6. Tube selon la revendication 5, dans lequel la bande multicouche (100) est pourvue, sur son deuxième bord latéral (110, 120) opposé et faisant face au premier bord latéral (110, 120), d'un renfoncement correspondant à la bordure latérale en saillie (5) de sorte que la bordure latérale en saillie (5) est positionnée dans le renfoncement, donnant au tube une configuration circulaire lisse et sans plis en correspondance de la zone où les bords latéraux (110, 120) sont joints.
  7. Tube selon la revendication 5 ou 6, dans lequel la bordure latérale en saillie (5) définissant l'élément de jonction possède une configuration à une seule couche et est défini par une extension d'une seule des couches (2, 3, 4).
  8. Tube selon l'une quelconque des revendications précédentes, dans lequel le matériau multicouche (100) est obtenu en pliant une seule feuille ou bande (50) autour des lignes de pliage parallèles (P1, P2) de telle sorte que les couches (2, 3, 4) se suivent le long d'une trajectoire en forme de « S », où les couches extérieures (2, 4) correspondent à des zones longitudinales extérieures de la feuille ou de la bande (50), tandis qu'au moins une couche intermédiaire (3) correspond à une zone longitudinale centrale de la feuille ou de la bande (50).
  9. Tube selon la revendication 8, dans lequel une première des couches extérieures (2, 4) est plus large que la couche intermédiaire (3) pour définir une bordure latérale en saillie (5) définissant un élément pour joindre les bords latéraux opposés (110, 120) du matériau multicouche (100) de manière à fermer le tube (1) de manière circonférentielle.
  10. Tube selon la revendication 9, dans lequel la deuxième couche extérieure (2, 4) est moins large que la couche intermédiaire (3) et définit un bord rétracté (6) derrière une zone de pliage et de jointure entre les deux autres couches (2, 3, 4), et dans lequel la zone de pliage et de jointure adopte, dans le tube (1), une configuration déformée à double encoche pour définir, sur un côté, une zone renfoncée (R) destinée à recevoir la bordure latérale en saillie (5) de la première couche extérieure (2, 4) et, sur l'autre côté, une partie en relief destinée à être essentiellement alignée au bord rétracté (6) de la deuxième couche extérieure (2, 4).
  11. Tube selon l'une quelconque des revendications précédentes 1 à 7, dans lequel le matériau multicouche (100) est obtenu en pliant une seule feuille ou bande (50) autour des lignes de pliage parallèles (P1, P2) de telle sorte que les couches (2, 3, 4) se suivent le long d'une trajectoire en spirale, où les couches extérieures (2, 4) correspondent, respectivement, à une première zone longitudinale extérieure et à une zone longitudinale centrale de la feuille ou de la bande (50), tandis qu'au moins une couche intermédiaire (3) correspond à une deuxième zone longitudinale extérieure de la feuille ou de la bande (50).
  12. Tube selon la revendication 11, dans lequel l'au moins une couche intermédiaire (3) est moins large que les couches extérieures (2, 4) de sorte que le bord intérieur libre (7) de la couche intermédiaire (3) est espacé de la ligne de pliage entre les couches extérieures (2, 4) pour définir une zone renfoncée (R) d'une première des couches extérieures (2, 4) ; la première couche extérieure (2, 4) comporte, sur le côté opposé à la zone renfoncée (R), une bordure latérale en saillie (5) couplée à la zone renfoncée (R) de la première couche (2, 4) pour définir un élément permettant de joindre les bords latéraux opposés (110, 120) du matériau multicouche (100) de manière à fermer circonférentiellement le tube (1).
  13. Tube selon l'une quelconque des revendications précédentes, dans lequel les couches superposées (2, 3, 4) sont reliées entre elles par un adhésif, de préférence par au moins une couche intermédiaire ininterrompue d'adhésif et, de préférence encore, par une couche intermédiaire d'adhésif pour chaque paire de couches adjacentes (2, 3, 4).
  14. Procédé de fabrication d'un tube multicouche de l'industrie du tabac, comprenant les étapes de :
    - alimenter une bande continue (50) le long d'une direction d'alimentation ;
    - plier la bande continue (50) sur elle-même autour d'au moins une première ligne de pliage longitudinale (P1, P2), parallèlement à la direction d'alimentation, pendant que la bande continue (50) est alimentée, jusqu'à l'obtention d'une bande multicouche (100) définie par la superposition d'au moins une première zone longitudinale et une deuxième zone longitudinale de la bande continue (50) ;
    - enrouler la bande multicouche (100) autour d'un axe longitudinal (X) parallèle à la direction d'alimentation jusqu'à juxtaposition mutuelle des bords latéraux opposés (110, 120) de la bande multicouche (100) ;
    - relier stablement les bords latéraux opposés (110, 120) de la bande multicouche (100) l'un à l'autre ;
    caractérisé en ce que l'étape de pliage de la bande continue (50) est accompli en pliant la bande (50) une première fois autour d'une première ligne de pliage longitudinale (P1), puis en pliant à nouveau la bande (50) autour d'une deuxième ligne de pliage longitudinale (P2) de manière à obtenir une bande (100) d'au moins trois couches, les lignes de pliage (P1, P2) étant parallèles entre elles et parallèles à la direction d'alimentation de la bande continue.
  15. Procédé selon la revendication 14, dans lequel l'étape de pliage est accomplie en pliant la bande (50) autour d'au moins un élément de pliage (300, 400), de préférence une plaque longitudinale mince, de sorte que l'au moins une ligne de pliage (P1, P2) soit située en correspondance d'un bord longitudinal (310, 410) respectif de l'au moins un élément de pliage (300, 400).
  16. Procédé selon la revendication 14 ou 15, dans lequel l'étape de pliage est précédée d'une étape consistant à réaliser au moins une ligne longitudinale de faiblesse (L1, L2) pour coïncider avec une ligne de pliage longitudinale (P1, P2) respective pendant l'étape de pliage.
  17. Procédé selon la revendication 16, dans lequel l'étape de pliage de la bande continue (50) est accomplie en pliant la bande (50) sur elle-même autour d'au moins deux lignes de pliage longitudinales parallèles (P1, P2) pour définir une bande d'au moins trois couches (100), et dans lequel l'étape consistant à réaliser au moins une ligne longitudinale de faiblesse (L1, L2) est effectuée en réalisant au moins deux lignes longitudinales de faiblesse (L1, L2) à l'aide d'un seul outil raineur (200), en particulier un rouleau raineur comportant au moins deux disques ou stries (210) étant espacés axialement l'un de l'autre pour réaliser des lignes de faiblesse parallèles (L1, L2) correspondantes sur la bande (50).
  18. Procédé selon la revendication 17, dans lequel l'étape de pliage de la bande (50) est accomplie en pliant la bande (50) autour des au moins deux lignes de pliage (P1, P2) de telle sorte qu'une zone centrale de la bande (50) reposant entre les deux lignes de pliage (P1, P2) définit une couche intermédiaire (3) de la bande à trois couches (100), tandis que les zones longitudinales restantes de la bande (50), qui se trouvent sur les côtés extérieurs des deux lignes de pliage (P1, P2), définissent les couches extérieures (2, 4) de la bande d'au moins trois couches (100), et dans lequel les couches (2, 3, 4) de la bande d'au moins trois couches (100) se suivent le long d'une trajectoire en forme de « S ».
  19. Procédé selon la revendication 18, dans lequel une première des couches extérieures (2, 4) de la bande d'au moins trois couches (100) est plus large que la couche intermédiaire (3) pour définir une bordure latérale en saillie (5) définissant un élément pour joindre les bords latéraux opposés (110, 120) de la bande d'au moins trois couches (100) de manière à fermer circonférentiellement le tube (1).
  20. Procédé selon la revendication 19, dans lequel la deuxième couche extérieure (2, 4) est moins large que la couche intermédiaire (3) et définit un bord rétracté (6) derrière une zone de pliage et de jointure entre les deux autres couches (2, 3, 4), et dans lequel l'étape consistant à enrouler la bande multicouche (100) autour de l'axe (X) inclut une étape consistant à déformer la zone de pliage et de jointure de manière à obtenir une configuration déformée à double encoche pour définir, sur un côté, une zone renfoncée (R) destinée à recevoir la bordure latérale en saillie (5) de la première couche extérieure (2, 4) et, sur l'autre côté, une partie en relief destinée à être alignée avec le bord rétracté (6) de la deuxième couche extérieure (2, 4).
  21. Procédé selon la revendication 17, dans lequel l'étape de pliage de la bande (50) est accomplie en pliant la bande (50) autour des lignes de pliage (P1, P2) de manière à ce que les couches extérieures (2, 4) de la bande d'au moins trois couches (100) correspondent, respectivement, à une première zone longitudinale extérieure et à une zone longitudinale centrale de la bande (50), tandis que l'au moins une couche intermédiaire (3) correspond à une deuxième zone longitudinale extérieure de la bande (50), et dans lequel les couches (2, 3, 4) de la bande d'au moins trois couches (100) se suivent le long d'une trajectoire en spirale.
  22. Procédé selon la revendication 21, dans lequel l'au moins une couche intermédiaire (3) est moins large que les couches extérieures (2, 4) de sorte que le bord intérieur libre (7) de la couche intermédiaire (3) est espacé de la ligne de pliage et de jointure entre les couches extérieures (2, 4) pour définir une cavité (8) et dans lequel l'étape consistant à enrouler la bande multicouche (100) autour de l'axe (X) inclut une étape consistant à déformer la bande d'au moins trois couches (100) en correspondance de la cavité (8) par aplatissement pour obtenir une zone renfoncée (R) ; la première couche extérieure (2, 4) comportant, sur le côté opposé à la zone renfoncée (R), une bordure latérale en saillie (5) couplée à la zone renfoncée (R) pour définir un élément permettant de joindre les bords latéraux opposés (110, 120) du matériau d'au moins trois couches (100) de manière à fermer circonférentiellement le tube (1).
  23. Procédé selon l'une quelconque des revendications 14 à 22, dans lequel l'étape de pliage de la bande continue (50) sur elle-même autour d'au moins une première ligne de pliage longitudinale (P1, P2) est associée à une étape consistant à appliquer de l'adhésif entre les couches adjacentes (2, 3, 4) de la bande multicouche (100), de préférence au moins une couche intermédiaire ininterrompue d'adhésif et, de préférence encore, une couche d'adhésif pour chaque paire de couches adjacentes (2, 3, 4).
EP19726750.3A 2018-04-24 2019-04-23 Tube multicouche de l'industrie du tabac et procédé de fabrication du tube multicouche Active EP3784066B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000004715A IT201800004715A1 (it) 2018-04-24 2018-04-24 Tubolare multistrato dell’industria del tabacco e metodo per la realizzazione di detto tubolare multistrato
PCT/IB2019/053326 WO2019207471A1 (fr) 2018-04-24 2019-04-23 Tube multicouche de l'industrie du tabac et procédé de fabrication du tube multicouche

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EP3784066A1 EP3784066A1 (fr) 2021-03-03
EP3784066B1 true EP3784066B1 (fr) 2023-07-05

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EP (1) EP3784066B1 (fr)
IT (1) IT201800004715A1 (fr)
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DE102020134003A1 (de) * 2020-12-17 2022-06-23 Hauni Maschinenbau Gmbh Vorrichtung und Verfahren zur Herstellung eines stab- oder rohrförmigen Artikels

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DE2505788C2 (de) * 1975-02-12 1985-03-28 Hauni-Werke Körber & Co KG, 2050 Hamburg Verfahren und Maschine zum Herstellen eines mehrwandigen Papierrohres für Rauchartikel-Mundstückhülsen
DE2542041A1 (de) * 1975-09-20 1977-03-24 Hauni Werke Koerber & Co Kg Verfahren und vorrichtung zum herstellen eines papierrohres fuer rauchartikel-mundstueckhuelsen
ITBO20120212A1 (it) * 2012-04-17 2013-10-18 Emmeci Spa Sbozzato per la realizzazione di scatole tonde
DE102014226019A1 (de) * 2014-12-16 2016-06-16 Hauni Maschinenbau Ag Doppellagiges Röhrchen der Tabak verarbeitenden Industrie sowie Vorrichtung und Verfahren zur Herstellung eines derartigen Röhrchens

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IT201800004715A1 (it) 2019-10-24
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PL3784066T3 (pl) 2023-10-23

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