EP3011847B1 - Unité et procédé d'application d'un additif sur une machine de fabrication de filtre de cigarettes - Google Patents

Unité et procédé d'application d'un additif sur une machine de fabrication de filtre de cigarettes Download PDF

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Publication number
EP3011847B1
EP3011847B1 EP15191346.4A EP15191346A EP3011847B1 EP 3011847 B1 EP3011847 B1 EP 3011847B1 EP 15191346 A EP15191346 A EP 15191346A EP 3011847 B1 EP3011847 B1 EP 3011847B1
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EP
European Patent Office
Prior art keywords
filtering material
additive
application unit
strip
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP15191346.4A
Other languages
German (de)
English (en)
Other versions
EP3011847A1 (fr
Inventor
Fulvio Pastore
Massimo Sartoni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GD SpA
Original Assignee
GD SpA
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Filing date
Publication date
Application filed by GD SpA filed Critical GD SpA
Publication of EP3011847A1 publication Critical patent/EP3011847A1/fr
Application granted granted Critical
Publication of EP3011847B1 publication Critical patent/EP3011847B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/60—Arrangements for mounting, supporting or holding spraying apparatus
    • B05B15/68—Arrangements for adjusting the position of spray heads
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
    • A24D3/0212—Applying additives to filter materials
    • A24D3/022—Applying additives to filter materials with liquid additives, e.g. application of plasticisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe

Definitions

  • the present invention relates to an application unit and method for applying an additive on a cigarette filter manufacturing machine.
  • the present invention finds advantageous application in a double packing machine for manufacturing cigarette filters to which the following description will make explicit reference without this implying any loss of generality.
  • a double packing machine for manufacturing cigarette filters comprising two forming beams for forming respective continuous rods of filter and, for each beam, a feed line of filtering material.
  • the feed lines are suited to receive in turn the filtering material from a conveying line, which extends between an input station of the feed lines themselves and a depository, in which two bales of filtering material are contained. From the bales respective tows of filtering material with circular cross section are drawn, which are fed along the conveyor line up to an intake device which is located at the input station and is suited to transversely spread out the two tows of filtering material so as to form two strips of filtering material with flattened section.
  • the two strips of filtering material Downstream from the intake device the two strips of filtering material are advanced along the respective feed lines and through a straightening unit, through a widening device which is suited to blow air inside the strips of filtering material to increase the volume of the strips themselves, and finally through an application unit for applying an additive, wherein the strips of filtering material are impregnated with chemicals (usually triacetin based) suited for giving flavour and plasticity to the filtering material.
  • chemicals usually triacetin based
  • Object of the present invention is to provide an application unit and a method for applying an additive on a cigarette filter manufacturing machine, in which said unit and method are free from the drawbacks described above, and are at the same time easy and inexpensive to produce.
  • number 1 indicates as a whole a double packing machine for manufacturing cigarette filters.
  • the packing machine 1 comprises two forming beams 2a and 2b for forming respective continuous rods 3a and 3b of filter and, for each beam 2a and 2b, a respective feed line 4a and 4b of filtering material.
  • the feed lines 4a and 4b are suited to receive, in turn, the filtering material by a conveyor line 5, which is part of the packing machine 1 and extends between an input station 6 of the feed lines 4a and 4b themselves and a depository 7, in which two bales 8a and 8b of filtering material are contained.
  • the conveyor line 5 comprises a guiding device 11 for the tows 9a and 9b of filtering material located above the bales 8a and 8b and a spreading device 12 located at the input station 6 immediately upstream from the traction assembly 10a and is suited to transversely open up the tows 9a and 9b of filtering material with circular cross section by means of spurts of compressed air so as to form respective strips 13a and 13b of filtering material with flattened section which are then fed to the roller traction assembly 10a.
  • the two strips 13a and 13b of filtering material are advanced, along respective feed lines 4a and 4b and in a direction 14 substantially horizontal, through a straightening unit 15, which is constituted by two assemblies 10b and 10c similar to the roller traction assembly 10a.
  • the two strips 13a and 13b of filtering material are advanced, along respective feed lines 4a and 4b in the direction 14, through a widening device 16, which is suited to blow air inside the strips 13a and 13b of filtering material to increase the volume of the strips 13a and 13b of filtering material themselves, and then through an application unit 17, in which the strips 13a and 13b of filtering material are soaked (impregnated) with elasticizing agents (typically triacetin) suited to confer flavour and plasticity to the filtering material.
  • elasticizing agents typically triacetin
  • the two strips 13a and 13b of filtering material are advanced, along respective feed lines 4a and 4b in the direction 14, and through a roller traction assembly 10a 10d, which is similar to the traction assemblies 10a and 10b, 10c and defines an output portion of the feed lines 4a and 4b.
  • the feed lines 4a and 4b are connected to the forming beams 2a and 2b through a twisting assembly 18 located immediately downstream from the traction assembly 10d.
  • the twisting assembly 18 receives the strips 13a and 13b of filtering material from the feed lines 4a and 4b, twists the strips 13a and 13b of filtering material themselves to obtain two ropes of filtering material, and feeds said ropes of filtering material to the forming beams 2a and 2b.
  • the rope of filtering material is fed over a tape 19a or 19b of paper previously rubberized in a gumming station 20 and subsequently wrapped transversely about the rope of filtering material itself to obtain a continuous rod 3a or 3b of filter.
  • a control station 21 for the density of the rods of filter 3a and 3b and a cutting head 22 are finally arranged, which is suited to cut transversely the rods 3a and 3b themselves to obtain respective successions of filter plugs (not illustrated).
  • the application unit 17 comprises a tank 23 which contains a plasticizer additive fluid (generally triacetin based) and has a bottom wall 24 and an top opening 25 at which the strips 13a or 13b of filtering material are advanced horizontally (i.e. along a horizontal advancing direction); in other words, each strip 13a or 13b of filtering material is fed over the tank 23 along a horizontal feed direction so as to slide at the top opening 25 of the tank 18 itself.
  • a plasticizer additive fluid generally triacetin based
  • the tank 23 houses inside a pair of spray devices 26, each of which directs a jet of additive (i.e. plasticizer fluid) onto a corresponding strip 13a or 13b of filtering material (i.e. to each spray device 26 a corresponding strip 13a or 13b of filtering material is coupled).
  • each spray device 26 comprises a plurality (battery) of spray nozzles 27 which are arranged one alongside with the other, are aligned perpendicular to a feed direction of the strips 13a and 13b of filtering material, and are oriented vertically upwards (i.e. onto the strip 13a or 13b of filtering material).
  • each spray device 26 comprises a rotating brush provided with bristles and partially immersed in a bath of additive; with the rotation of the brush, the bristles 42 collect additive and by means of an abutment, with which the bristles partially interfere during rotation, spray the additive towards the strip 13a or 13b of filtering material.
  • the tank 23 comprises two screens 28, each of which is interposed between the corresponding spray device 26 and the strip 13a or 13b of filtering material and has at least one through window (slit) 29 for the passage of the additive onto the strip 13a or 13b of filtering material.
  • Each window 29 has a smaller size than the size of the top opening 25 of the tank 23; furthermore, the width of each window 29 is slightly greater than the width of the strip 13a or 13b of filtering material so as to ensure a proper supply of additive also on the lateral edges of the strip 13a or 13b of filtering material in the event of any misalignment to which the strip 13a or 13b of filtering material may be subjected during the advancement.
  • the size of each window 29 is manually adjustable by means of corresponding screws arranged inside the slots.
  • the screens 28 are adjustable and/or replaceable in shape, i.e. as a function of the width, the thickness and/or the material of the strips 13a and 13b of the filtering material to be treated. It is important to note that the screens 28 remain completely still during the operation of the packing machine 1 and are adjusted and/or replaced only when the packing machine 1 is stopped and is therefore subject to a tuning operation, or to a shape change operation.
  • each spray device 26 is mounted movable along a vertical adjusting direction D to adjust the distance between the spray device 26 and the strip 13a or 13b of filtering material (i.e. to bring the spray device 26 closer to the strip 13a or 13b of filtering material or to remove the spray device 26 from the strip 13a or 13b of filtering material).
  • the adjusting direction D along which each spray device 26 is moved is perpendicular to the lying plane (oriented horizontally) of the strip 13a or 13b of filtering material and is also perpendicular to the feed direction (also oriented horizontally) of the strip 13a or 13b of filtering material, in addition, each spray nozzle 27 is oriented vertically, i.e. parallel to the adjusting direction D.
  • Each spray device 26 is coupled to a specialized electrically controlled actuating device 30 which moves the spray device 26 in the vertical adjusting direction D.
  • a specialized electrically controlled actuating device 30 which moves the spray device 26 in the vertical adjusting direction D.
  • two guides 31 are provided, which are arranged in a fixed position inside the tank 23 at a certain distance from one another, which protrude projecting from the bottom wall 24 of the tank 23 itself, and are oriented vertically, i.e. parallel to the adjusting direction D.
  • Each spray device 26 comprises a rigid supporting body 32 which is fitted to the guides 31 to slide along the same guides 31 parallel to the adjusting direction D and supports the spray nozzles 27 of the spray device 26 itself; in particular, each supporting body 32 has two through holes, through which the corresponding guides 31 slide.
  • Each actuating device 30 is mechanically interposed between the tank 23 (in particular the bottom wall 24 of the tank 23) and the supporting body 32 to adjust the position of the supporting body 32 itself along the guides 31 (i.e. in the
  • each actuating device 30 comprises a screw 33 located in an axially fixed position inside the tank 23, is oriented parallel to the vertical adjusting direction D and is inserted inside a threaded hole 34 formed through the supporting body 32; obviously the thread of the screw 33 meshes with the thread of the threaded hole 34 so as to establish a mechanical coupling, stable and reliable between the screw 33 and the supporting body 32.
  • each actuating device 30 comprises an electric motor 35 for rotating the screw 33 both ways to determine a consequent axial sliding of the supporting body 32 along the screw 33 and therefore in the adjusting direction D.
  • each screen 28 (which is interposed between the spray device 26 and the strip 13a or 13b of filtering material) is supported and rigidly fixed (typically by means of corresponding screws shown in Figure 4 ) to the tops of the guides 31.
  • the two guides 31 also perform the function of supporting the screen 28.
  • a corresponding feed conduit 36 which feeds the additive to the spray nozzle 27 and comprises, among other things, a flexible hose 37 that deforms elastically as the spray nozzle 27 moves (together with the supporting body 32) in the vertical adjusting direction D.
  • the flexible hose 37 that forms an intermediate part of each feed conduit 36 is made of elastic material and forms a loop, so as to accompany, with an elastic deformation devoid of relevant mechanical stress, the movement of the spray nozzle 27 (together with the supporting body 32) in the vertical adjusting direction D.
  • a solenoid valve 38 is provided, which is hydraulically arranged along the corresponding feed conduit 36 and is electronically controllable to open or close (and possibly reduce) the feed conduit 36 itself.
  • each spray nozzle 27 is controlled by a corresponding solenoid valve 38 which activates or stops (and possibly reduces) the supply of additive through the spray nozzle 27 itself.
  • Each spray device 26 comprises a corresponding electro-actuated circulating pump 39, which has an intake that draws the additive both inside the tank 23 (recycling the additive which has been previously sprayed by the nozzles 27 but was not retained by the strips 13a and 13b of filtering material), and from an outside tank. Furthermore, each circulating pump 39 has a delivery side which feeds the additive under pressure to all the spray nozzles 27 of the corresponding spray device 26; in particular, a manifold 40 is provided which receives the additive under pressure from the delivery side of the corresponding circulating pump 39 and distributes the additive under pressure to all the corresponding solenoid valves 38 (from which the additive under pressure reaches to the spray nozzles 27).
  • a final portion 41 of each feed conduit 36 close to the spray nozzle 27 is rigid (i.e. is made of non deformable rigid material) and slides freely inside a through-hole 42 formed through the bottom wall 24 of the tank 23 so as to accompany the movement of the spray nozzle 27 (together with the supporting body 32) in the vertical adjusting direction D.
  • a flexible corrugated tube 43 is provided, which is located around the end portions 41 of all feed conduits 36 of the same spray device 26 and deforms elastically during the movement of the spray nozzles 27 (together with the supporting body 32) in the vertical adjusting direction D.
  • the flexible tube 43 is sealingly fixed on one side to the supporting body 32 and on the opposite side is sealingly fixed to the bottom wall 24 of the tank 23 so as to isolate the end portions 41 of the feed conduits 36 and mainly the corresponding through holes 42 from the bath of additive on the bottom of the tank 23.
  • the atomization of the additive exiting the spray nozzles 27 could take place by exploiting a flow of compressed air inside of which the additive is fed at a relatively low pressure; in other words, operation takes place with the particularly reduced pressure of the additive and the additive is atomized by mixing the additive with compressed air suitably adjusted in pressure.
  • each strip 13a or 13b of filtering material two spray devices 26 opposite one to the other are provided, which are arranged on opposite sides of the strip 13a or 13b of filtering material so as to apply the additive on both the opposite faces of the strip 13a or 13b of the filtering material itself; in this embodiment, only one spray device 26 (typically the lower spray device 26) may be movable in the vertical adjusting direction D towards and away from the strip 13a or 13b of filtering material, or both spray devices 26 may be movable in the vertical adjusting direction D towards and away from the strip 13a or 13b of filtering material.
  • electric heaters are provided which are arranged close to each spray device 26 (typically in the corresponding manifold 40) and are controlled to maintain the temperature of the additive equal to a generally predetermined optimum temperature; preferably, the electric heaters are controlled in feedback by using one or more temperature sensors arranged in contact with the additive.
  • the application unit 17 comprises a closing lid (not illustrated) for the tank 23 located over the tank 23 itself.
  • the tank 23 has, parallel to the feed direction of the strips 13a and 13b of filtering material, a respective lid supporting bracket which keeps the lid at a certain distance from the laying plane of the strips 13a and 13b of filtering material, so as to allow the free sliding of the strips 13a and 13b of filtering material themselves.
  • each spray device 26 in the vertical adjusting direction D to adjust the distance between the spray device 26 and the strip 13a or 13b of filtering material, and then change the setting for applying the additive on the strip 13a or 13b of filtering material itself (or adjust the amount of additive that is fed onto the strip 13a or 13b of filtering material).
  • the mechanical interaction between the cone of additive sprayed from each spray nozzle 27 and the window 29 of the screen 28 varies; in particular, by increasing the distance between the spray device 26 and the strip 13a or 13b of filtering material the cone of additive sprayed from each spray nozzle 27 is more open when impacting onto the screen 28, therefore the fraction of the additive that crosses the window 29 decreases and consequently the amount of additive that is fed to the strip 13a or 13b of filtering material decreases.
  • each spray device 26 and the strip 13a or 13b of filtering material may be combined with other expedients intended to regulate the amount of additive that is applied to the strip 13a or 13b of filtering material itself; for example it could be possible to change the supply pressure of the additive towards each spray device 26 or movable partitions may be used which are located inside the tank 23 and intercept part of the additive before the additive reaches the strips 13a and 13b of filtering material.
  • the strips 13a and 13b of filtering material are fed horizontally and the spray devices 26 spray vertically onto the strips 13a and 13b of filtering material; consequently, the adjusting direction D is oriented vertically.
  • the strips 13a and 13b of filtering material are fed vertically and the spray devices 26 spray horizontally onto the strips 13a and 13b of filtering material; consequently, the adjusting direction D is oriented horizontally.
  • the application unit 17 described above has numerous advantages.
  • the application unit 17 described above allows to adjust in a very effective, accurate and precise way the quantity of additive that is applied to each strip 13a or 13b of filtering material when the packing machine 1 is operative.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Claims (12)

  1. Unité d'application (17) destinée à appliquer un additif sur une machine de fabrication de filtre de cigarette (1) ; l'unité d'application (17) comprenant :
    une cuve à toit ouvert (23) sur laquelle au moins une bande (13a ; 13b) de matériau filtrant est délivrée ; et
    un dispositif de pulvérisation (26) situé à l'intérieur de la cuve (23) et qui dirige un jet d'additif sur la bande (13a ; 13b) de matériau filtrant ;
    l'unité d'application (17) étant caractérisée en ce que, à l'intérieur de la cuve (23), le dispositif de pulvérisation (26) est monté pour se déplacer dans une direction d'ajustement (D) pour ajuster la distance entre le dispositif de pulvérisation (26) et la bande (13a ; 13b) de matériau filtrant.
  2. Unité d'application (17) selon la revendication 1, et comprenant un dispositif d'actionnement commandé électriquement (30) destiné à déplacer le dispositif de pulvérisation (26) dans la direction d'ajustement (D).
  3. Unité d'application (17) selon la revendication 1 ou 2, et comprenant :
    au moins un guide (31) situé dans une position fixe à l'intérieur de la cuve (23) et parallèle à la direction d'ajustement (D) ; et
    un corps de support (32) qui supporte le dispositif de pulvérisation (26) et est monté sur le guide (31) pour courir le long de ce dernier.
  4. Unité d'application (17) selon la revendication 3, et comprenant un crible (28) qui est interposé entre le dispositif de pulvérisation (26) et la bande (13a ; 13b) de matériau filtrant, comporte au moins une fenêtre traversante (29) permettant le passage de l'additif sur la bande (13a ; 13b) de matériau filtrant, et est fixé rigidement au toit du guide (31).
  5. Unité d'application (17) selon la revendication 3 ou 4, et comprenant un dispositif d'actionnement commandé électriquement (30) destiné à déplacer le dispositif de pulvérisation (26) dans la direction d'ajustement (D).
  6. Unité d'application (17) selon la revendication 5, dans laquelle le dispositif d'actionnement (30) comprend :
    une vis (33) qui est située dans une position axialement fixe à l'intérieur de la cuve (23), est orientée parallèle à la direction d'ajustement (D), et est insérée à l'intérieur d'un trou fileté (34) formé à travers le corps de support (32) ; et
    un moteur électrique (35) destiné à faire tourner la vis (33) dans les deux sens.
  7. Unité d'application (17) selon l'une des revendications 1 à 6, dans laquelle le dispositif de pulvérisation (26) comprend au moins une buse de pulvérisation (27) orientée parallèle à la direction d'ajustement (D).
  8. Unité d'application (17) selon la revendication 7, et comprenant un conduit de délivrance (36) destiné à délivrer un additif à la buse de pulvérisation (27), et qui comprend un tuyau souple (37) qui se déforme élastiquement à mesure que la buse de pulvérisation (27) se déplace dans la direction d'ajustement (D).
  9. Unité d'application (17) selon la revendication 7 ou 8, et comprenant une pompe de circulation (39) ayant une admission, qui aspire un additif à la fois de la cuve (23) et d'une cuve extérieure, et un côté de distribution qui délivre l'additif sous pression à la buse de pulvérisation (27).
  10. Unité d'application (17) selon la revendication 7, 8 ou 9, et comprenant :
    un conduit de délivrance (36) destiné à délivrer l'additif à la buse de pulvérisation (27) ; et
    un tube ondulé souple (43) qui entoure une portion d'extrémité (41) du conduit de délivrance (36), près de la buse de pulvérisation (27), et se déforme élastiquement à mesure que la buse de pulvérisation (27) se déplace dans la direction d'ajustement (D).
  11. Unité d'application (17) selon la revendication 10, dans laquelle la portion d'extrémité (41) du conduit de délivrance (36) glisse librement à l'intérieur d'un trou traversant (42) formé à travers une paroi basse (24) de la cuve (23).
  12. Procédé d'application d'un additif d'une machine de fabrication de filtre de cigarette (1) ; le procédé comprenant les étapes de :
    délivrance d'au moins une bande (13a ; 13b) de matériau filtrant sur une cuve à toit ouvert (23) ; et
    direction d'un jet d'additif sur la bande (13a ; 13b) de matériau filtrant au moyen d'un dispositif de pulvérisation (26) situé à l'intérieur de la cuve (23) ;
    le procédé étant caractérisé en ce qu'il comprend l'étape supplémentaire de déplacement du dispositif de pulvérisation (26), à l'intérieur de la cuve (23), dans une direction d'ajustement (D) pour ajuster la distance entre le dispositif de pulvérisation (26) et la bande (13a ; 13b) de matériau filtrant.
EP15191346.4A 2014-10-24 2015-10-23 Unité et procédé d'application d'un additif sur une machine de fabrication de filtre de cigarettes Not-in-force EP3011847B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBO20140591 2014-10-24

Publications (2)

Publication Number Publication Date
EP3011847A1 EP3011847A1 (fr) 2016-04-27
EP3011847B1 true EP3011847B1 (fr) 2017-09-13

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CN (1) CN105533805A (fr)

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Publication number Publication date
CN105533805A (zh) 2016-05-04
EP3011847A1 (fr) 2016-04-27

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