EP3245884B1 - Unit and method for forming a coaxial stream in a machine for making coaxial cigarettes - Google Patents
Unit and method for forming a coaxial stream in a machine for making coaxial cigarettes Download PDFInfo
- Publication number
- EP3245884B1 EP3245884B1 EP17171321.7A EP17171321A EP3245884B1 EP 3245884 B1 EP3245884 B1 EP 3245884B1 EP 17171321 A EP17171321 A EP 17171321A EP 3245884 B1 EP3245884 B1 EP 3245884B1
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- EP
- European Patent Office
- Prior art keywords
- stretch
- belt
- unit
- suction
- smokable material
- 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.)
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- 235000019504 cigarettes Nutrition 0.000 title claims description 26
- 238000000034 method Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims description 71
- 241000208125 Nicotiana Species 0.000 claims description 32
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 32
- 239000002245 particle Substances 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 4
- 238000004260 weight control Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- 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
- A24C5/14—Machines of the continuous-rod type
- A24C5/18—Forming the rod
- A24C5/1821—Forming the rod containing different tobacco mixtures, e.g. composite rods
Definitions
- This invention relates to a unit and a method for forming a coaxial stream in a machine for making coaxial cigarettes.
- coaxial cigarette is used to mean a cigarette or similar smoking article in which the piece of smokable material comprises a central core and a tubular portion placed around the central core.
- the tubular portion can be made of a first smokable material, preferably comprising shredded tobacco, and the core of a second smokable material.
- Coaxial cigarettes are known from documents WO2007/069091 and EP503461 .
- Document US 4632130 discloses a method and apparatus for making a rod-like filler of smokable material.
- Document DE102013220757 schematically describes producing coaxial cigarettes by making a first stream formed by a plurality of tobacco segments, joining the first stream to a bed of tobacco fibres on a suction conveyor and placing other tobacco fibres on the first bed of tobacco fibres and on the first stream to form a second stream.
- Document DE102013220757 thus shows a layered cigarette in which a first stream, made beforehand, is inserted between two layers of shredded tobacco. This feature does not allow obtaining a truly coaxial cigarette because it involves making a sequence of layers. Besides that, document DE102013220757 provides a very schematic teaching which does not tackle aspects of applicability and functionality such as centring the first stream on the first layer and controlling the streams up to the point where the cigarette rod is formed. For example, moving the first stream requires special attention at curves and changes of direction and may interfere with the placing of the further tobacco fibres.
- Document GB2260887 describes the formation of a first stream over which two layers of shredded tobacco are placed in various ways and configurations. In one of the embodiments described, a layer of shredded tobacco is wound around the first stream by a specific device located downstream of the suction conveyor. Document GB2260887 , too, provides a very schematic teaching, especially with reference to this embodiment, and also does not tackle the issues mentioned above with reference to document DE102013220757 .
- This invention has for an aim to provide a unit and a method for forming a coaxial stream for a machine for making coaxial cigarettes to overcome the above mentioned drawbacks. More specifically, the aim of the invention is to provide a unit and a method for forming a coaxial stream for a machine for making coaxial cigarettes and which allow optimum control of the streams as far as the point where the cigarette rod is formed, optimum control of the materials and their correct positioning relative to each other.
- This invention accordingly provides a unit and a method for forming a coaxial stream in a machine for making coaxial cigarettes as described in the accompanying claims.
- the numeral 1 denotes in its entirety a cigarette making machine comprising a unit 2 for forming a coaxial stream 3 comprising an elongate central core 3a and an elongate tubular portion 3b placed around the central core 3a.
- the tubular portion 3b is made of a first smokable material, preferably comprising shredded tobacco; the core 3a is made of a second smokable material, comprising shredded tobacco (obtainable from the unit 2 of Figure 1 ), preferably of a different type from that used to make the tubular portion, or segments of one or more smokable materials (obtainable from the unit 2 of Figure 10 ).
- the coaxial stream 3 will eventually be divided into cigarette segments used to make coaxial cigarettes, not illustrated.
- the unit 2 comprises a first feed unit 4 for feeding the first smokable material, preferably shredded tobacco, suitable for forming the tubular portion 3b, and a second feed unit 6 for feeding the second smokable material, suitable for forming the core 3a.
- first feed unit 4 for feeding the first smokable material, preferably shredded tobacco, suitable for forming the tubular portion 3b
- second feed unit 6 for feeding the second smokable material, suitable for forming the core 3a.
- first smokable material and the second smokable material are in the form of shredded tobacco 5a, 5b.
- the first smokable material is fed by means of an air flow along a substantially vertical duct 7a defining an ascending flow of tobacco particles 5a.
- the duct 7a is the final stretch of the first unit 4 which, in a first possible embodiment of it, is described in detail further on in this description.
- the second smokable material is fed by means of an air flow and/or by gravity along a substantially vertical duct 7b defining a descending flow of tobacco particles 5b.
- the duct 7b is the final stretch of the second unit 6.
- the unit 2 also comprises a suction conveyor 8 comprising an air permeable belt 9 which is wound in a loop around a chamber 10.
- the chamber 10 communicates with a suction unit of known type, not illustrated, and is configured to apply the suction on the belt 9 at least at some zones, for example through openings made in the wall which delimits the chamber, in known manner and not illustrated.
- the belt 9 is wound around pulleys 9a which move it in a direction of travel "A" to define a closed path "P" which follows the lateral profile of the belt itself.
- the first unit 4 is configured to feed the first smokable material along a first stretch "P1" of the path "P" along which the belt 9 is subjected to the suction applied by the chamber 10.
- the suction conveyor 8, and in particular the belt 9, closes the top of the duct 7a so that the first stretch "P1" is located in a lower portion 8a of the suction conveyor 8.
- the second unit 6 is configured to feed the second smokable material along a second stretch "P2" of the path "P" downstream of the first stretch "P1" in the direction of travel "A" of the belt 9.
- the belt 9 is subjected to the suction applied by the chamber 10.
- the suction conveyor 8, and in particular the belt 9 closes the bottom of the duct 7b so that the second stretch "P2" is located in an upper portion 8b of the suction conveyor 8.
- the numeral 11 denotes shaping means located along a third stretch "P3" of the path "P" downstream of the second stretch "P2" in the direction of travel "A" of the belt 9.
- the third stretch "P3" is also located in the upper portion 8a of the suction conveyor 8.
- the shaping means 11 are configured to progressively deform the belt 9 as it advances along the path "P" in such a way as to wrap it around the first smokable material to form the tubular portion 3b of the coaxial stream 3 around the core 3a.
- the shaping means 11 comprise at least two side walls 12 configured to support the belt 9 at least laterally and defining a supporting cavity 13. Transversely to the feed direction "A", the cross section of the supporting cavity changes by closing along the feed direction "A" of the belt 9 along an initial portion of the third stretch "P3" which extends up to a section 14 for forming the coaxial stream 3. In the initial portion of the third stretch "P3", the belt 9 is wound round itself along the feed direction "A" of the belt itself, following the shape of the side walls 12 and of the supporting cavity 13.
- the transverse cross section of the supporting cavity 13 changes by opening along the feed direction "A" of the belt 9.
- the belt 9 gradually opens out and returns to its flat shape along the feed direction "A” of the belt itself following the shape of the side walls 12 and of the supporting cavity 13.
- the belt 9 is isolated from the chamber 10 so as not to be subjected to suction.
- the side walls 12 meet under the belt 9 in such a way as to isolate it from the chamber 10, as illustrated in Figures 6 and 7 .
- the belt 9 is placed in communication with the chamber 10 so as to be subjected to suction.
- the side walls 12 are spaced apart under the belt 9, creating a channel 15 in communication with the chamber 10, as illustrated in Figures 4 and 5 .
- the unit 2 comprises a levelling device 16 positioned between the first stretch "P1" and the second stretch "P2" and operating on a layer 17a of the first smokable material feeding out of the duct 7a. More specifically, the levelling device 16 is positioned at the lower portion 8a of the suction conveyor 8. The desired quantity of tobacco can be measured by the weight control system "W", schematically illustrated in Figure 1 , which adjusts the height of the levelling device 16.
- the unit 2 also comprises a suction transfer conveyor 18 interposed at the top between the suction conveyor 8 and a rod forming unit 19 which, in a first possible embodiment of it, is described in detail further on in this description.
- the suction transfer conveyor 18 is configured to transfer the coaxial stream 3 from an upper unloading station 20 of the suction conveyor 8 along the third stretch "P3" downstream of the section 14 for forming the coaxial stream to an upper loading station 21 of the rod forming unit 19.
- the suction transfer conveyor 18 comprises an air permeable belt 22 which is wound in a loop around a chamber 23.
- the chamber 23 communicates with a suction unit of known type, not illustrated, and is configured to apply the suction on the belt 22 at least at some zones, for example through openings made in the wall which delimits the chamber, in known manner and not illustrated.
- the belt 23 is wound around pulleys 24 which move it in a direction of travel "B" to define a closed path "P" which follows the lateral profile of the belt itself.
- a lower stretch 25 of the belt 22 is configured to partly wrap an upper portion of the coaxial stream 3 to define a path for transferring the coaxial stream itself.
- the numeral 26 denotes containment walls associated with the suction transfer conveyor 18 and extending between the unloading station 20 and the loading station 21 in the lower stretch 25 of the belt 22 for laterally containing the coaxial stream 3 being transferred by the suction conveyor 8 to the rod forming unit 19.
- a levelling device 27 is located along the transfer path to operate on the tubular portion 3b of the coaxial stream 3.
- the containment walls 26 advantageously have a break in them at the levelling device 27.
- the coaxial stream 3 is disposed on a belt 28 of the rod forming unit 19 with a continuous paper tape 29 interposed between it and the belt.
- the paper tape 29 is fed together with the belt 28 along a customary rod forming beam 30 which, in known manner, progressively folds the belt 28 transversely around the tape 29 and the coaxial stream 3.
- the opposite longitudinal ends of the tape 29 are joined to each other in known manner by a gluing device, not illustrated, to form a continuous coaxial rod, which is subsequently cut transversely into segments (not illustrated) by a cutting head (of known type not illustrated) to form cigarettes.
- Figure 11 shows a cigarette making machine 1 comprising the first feed unit 4 for feeding the first smokable material, the second feed unit 6 for feeding the second smokable material and the suction conveyor 8.
- the first unit 4 comprises an infeed hopper through which the smokable material is fed to a feed duct 31 comprising a conveying wheel 32.
- the flow "F" of material is preferably directed upwards and vertical.
- the feed duct divides into a first feed portion 33 configured to feed the first unit 4 and a second feed portion 34 configured to feed the second unit 6.
- first smokable material and the second smokable material coincide.
- first and second feed portions may be connected to respective feed ducts, each intended to feed a specific smokable material when the first and second smokable materials are different.
- One or more conveying wheels 35 may be disposed along the first feed portion 33 and/or the second feed portion 34. Suitable suction and/or blowing means are provided along the feed duct 31 or along the first and second feed portions 33, 34.
- the first smokable material suitable for forming the tubular portion 3b of the coaxial stream is fed at the bottom of the suction conveyor 8, in particular along the first stretch "P1" of the path "P" defined by the belt 9 of the suction conveyor 8.
- the tobacco 5a coming out of the duct 7a collects on the lower branch of the belt 9, forming a layer 17a of tobacco whose thickness is adjusted by the levelling device 16, which removes the excess of the first smokable material as it passes between the first and the second stretch, as a function of the necessary quantity of tobacco, measured by the weight control system "W" which adjusts the height of the levelling device 16.
- the second smokable material suitable for forming the core 3a of the coaxial stream 3 is fed at the top of the suction conveyor 8, along the second stretch "P2" of the path "P". More specifically, the tobacco 5b falling down along the duct 7b collects on the upper branch of the belt 9, forming a layer 17b of tobacco.
- the width of the layer 17a is comparable to the circumference of the finished cigarette and the width of the layer 17b is comparable to the diameter of the core 3a.
- the belt 9 is progressively deformed in such a way as to wrap it around the first smokable material to form the tubular portion 3b of the coaxial stream 3 around the core 3a. More specifically, the belt 9 is wound round itself along the feed direction "A" as far as the section 14 for forming the coaxial stream 3 and then opened out after the forming section.
- the belt 9 is not subjected to suction, that is to say, it is not in communication with the chamber 10.
- the coaxial stream 3 thus obtained is transferred between the upper unloading station 20 of the suction conveyor 8 and the upper loading station 21 of the rod forming unit 19.
- the belt 22 of the suction conveyor 18 is wrapped around at least an upper portion of the coaxial stream, which is suspended along the transfer path and held in place by suction.
- the coaxial stream 3 is kept in shape by the containment walls 26 associated with the suction transfer conveyor 18. The excess of the first smokable material is removed by the levelling device 27 while the coaxial stream 3 is being transferred from the suction conveyor 8 to the rod forming unit 19.
- the levelling device is adjustable in height by a total weight control unit, of known type and not illustrated, so that once the weight of the tobacco is adjusted by means of the levelling device 16, the two tobacco components are precisely measured.
- the coaxial stream 3 received by the rod forming unit 19 advances along the rod forming beam 30 together with the paper tape 29 to form the continuous rod.
- Figure 10 shows a possible variant embodiment comprising the first feed unit 4 for feeding the first smokable material, preferably in the form of shredded tobacco 5a, suitable for forming the tubular portion 3b, and a second feed unit 60 for feeding the second smokable material, suitable for forming the core 3a in the form of segments of one or more smokable materials, which in the example, are two different smokable materials.
- the second unit 60 comprises a rotary element 61 configured to position the segments parallel to the second stretch "P2" of the path "P".
- the rotary element 61 is fed by one or more loading hoppers 62 (two in the example of Figure 11 ) and by one or more sequences 63 of feed drums, preferably spacing adapters.
- the second smokable material suitable for forming a core 3a of the coaxial stream 3 is fed by placing an aligned sequence of segments on the upper branch of the belt 9 to form a core 3a resting on the layer 17a of tobacco.
- Figure 13 shows a possible variant embodiment comprising the first feed unit 4 for feeding the first smokable material, in the form of shredded tobacco 5a, suitable for partially forming the tubular portion 3b.
- the first unit 4 comprises a substantially vertical duct 7a defining an ascending flow of particles of the first smokable material in the form of shredded tobacco 5a.
- the belt 9, closes the top of the duct 7a so that the first stretch P1 is located in a lower portion 8a of the suction conveyor 8.
- the numeral 9' denotes a further air permeable belt which is wound in a loop around a further chamber 10a communicating with a suction unit and which is movable in a direction of travel A' to define a closed path P'.
- a stretch "X1" of the further belt 9' is superposed on the top of a stretch "X" of the belt 9.
- the second unit 600 comprises feed means, not illustrated, configured to feed, between the belt 9 and the further belt 9', an elongate element "L" of the second smokable material suitable for forming the core 3a.
- the reference label 7b denotes a substantially vertical duct defining a descending flow of particles of a third smokable material in the form of shredded tobacco, preferably the same as the first smokable material.
- the further belt 9' closes the bottom of the duct 7b.
- the suction transfer conveyor 18 is interposed between the suction conveyor 8 and the rod forming unit 19.
- the suction transfer conveyor 18 is configured to transfer the coaxial stream 3 and comprises an air permeable belt which is wound in a loop around a chamber 23 in communication with a suction unit.
- the further belt 9' itself forms the suction conveyor 18.
- the suction conveyor 18 is configured to partly wrap an upper portion of the coaxial stream 3 and to keep it suspended and held by suction along the transfer path.
- the first smokable material is fed below the suction conveyor 8 and the third smokable material, preferably the same as the first smokable material, is fed above the further belt 9'.
- the elongate element "L" of the second smokable material is fed in such a way as to place it between the belt 9 and the further belt 9', in particular between the two stretches "X" and "X1".
- the machine 1 illustrated in Figure 11 may be used in conjunction with the embodiment illustrated in Figure 13 .
- the belt 9 is fed by the duct 7a, preferably curved, and the belt 9' is fed by the duct 7b, preferably curved.
- the two ducts are fed with the same smokable material coming from the feed duct 31 and divided Into the first and second feed portions 33, 34.
- the first and second feed portions 33, 34 may be positioned in a front plane of the machine 1.
Landscapes
- Manufacturing Of Cigar And Cigarette Tobacco (AREA)
- Wrapping Of Specific Fragile Articles (AREA)
Description
- This invention relates to a unit and a method for forming a coaxial stream in a machine for making coaxial cigarettes.
- The term "coaxial cigarette" is used to mean a cigarette or similar smoking article in which the piece of smokable material comprises a central core and a tubular portion placed around the central core. Thus, the tubular portion can be made of a first smokable material, preferably comprising shredded tobacco, and the core of a second smokable material.
- Coaxial cigarettes are known from documents
WO2007/069091 andEP503461 US 4632130 discloses a method and apparatus for making a rod-like filler of smokable material. - Document
DE102013220757 schematically describes producing coaxial cigarettes by making a first stream formed by a plurality of tobacco segments, joining the first stream to a bed of tobacco fibres on a suction conveyor and placing other tobacco fibres on the first bed of tobacco fibres and on the first stream to form a second stream. - Document
DE102013220757 thus shows a layered cigarette in which a first stream, made beforehand, is inserted between two layers of shredded tobacco. This feature does not allow obtaining a truly coaxial cigarette because it involves making a sequence of layers. Besides that, documentDE102013220757 provides a very schematic teaching which does not tackle aspects of applicability and functionality such as centring the first stream on the first layer and controlling the streams up to the point where the cigarette rod is formed. For example, moving the first stream requires special attention at curves and changes of direction and may interfere with the placing of the further tobacco fibres. - Document
GB2260887 GB2260887 DE102013220757 . - This invention has for an aim to provide a unit and a method for forming a coaxial stream for a machine for making coaxial cigarettes to overcome the above mentioned drawbacks. More specifically, the aim of the invention is to provide a unit and a method for forming a coaxial stream for a machine for making coaxial cigarettes and which allow optimum control of the streams as far as the point where the cigarette rod is formed, optimum control of the materials and their correct positioning relative to each other.
- This invention accordingly provides a unit and a method for forming a coaxial stream in a machine for making coaxial cigarettes as described in the accompanying claims.
- The invention is described below with reference to the accompanying drawings, which illustrate non-limiting embodiments of it, and in which:
- -
Figure 1 is a schematic side view, partly in cross section, showing a portion of a cigarette making machine comprising a unit for forming a coaxial stream according to a first embodiment of this invention;Figure 2 is a cross-section through the line II-II ofFigure 1 ; -
Figure 3 is a cross-section through the line III-III ofFigure 1 ; -
Figure 4 is a cross-section through the line IV-IV ofFigure 1 ; -
Figure 5 is a cross-section through the line V-V ofFigure 1 ; -
Figure 6 is a cross-section through the line VI-VI ofFigure 1 ; -
Figure 7 is a cross-section through the line VII-VII ofFigure 1 ; -
Figure 8 is a cross-section through the line VIII-VIII ofFigure 1 ;Figure 9 is a cross-section through the line IX-IX ofFigure 1 ; - -
Figure 10 is a schematic side view, partly in cross section, showing a portion of a cigarette making machine comprising a unit for forming a coaxial stream according to a second embodiment of this invention; - -
Figure 11 is a schematic front view, partly in cross section, showing a portion of a cigarette making machine comprising a unit for forming a coaxial stream according to this invention; - -
Figure 11a is a schematic front view, partly in cross section, showing a portion of a cigarette making machine comprising a unit for forming a coaxial stream according to this invention; - -
Figure 12 is a perspective view showing a portion of a coaxial stream made by a unit for forming a coaxial stream according to this invention; - -
Figure 13 is a schematic side view, partly in cross section, showing a portion of a cigarette making machine comprising a unit for forming a coaxial stream according to a third embodiment of this invention. - With reference to the accompanying drawings, the
numeral 1 denotes in its entirety a cigarette making machine comprising a unit 2 for forming acoaxial stream 3 comprising an elongatecentral core 3a and an elongatetubular portion 3b placed around thecentral core 3a. - The
tubular portion 3b is made of a first smokable material, preferably comprising shredded tobacco; thecore 3a is made of a second smokable material, comprising shredded tobacco (obtainable from the unit 2 ofFigure 1 ), preferably of a different type from that used to make the tubular portion, or segments of one or more smokable materials (obtainable from the unit 2 ofFigure 10 ). - The
coaxial stream 3 will eventually be divided into cigarette segments used to make coaxial cigarettes, not illustrated. - The unit 2 comprises a
first feed unit 4 for feeding the first smokable material, preferably shredded tobacco, suitable for forming thetubular portion 3b, and asecond feed unit 6 for feeding the second smokable material, suitable for forming thecore 3a. - Described below is a first embodiment of the unit 2, with reference to
Figures 1-9 , where both the first smokable material and the second smokable material are in the form of shreddedtobacco - With reference to
Figure 1 , in the final stretch of thefirst unit 4, the first smokable material is fed by means of an air flow along a substantiallyvertical duct 7a defining an ascending flow oftobacco particles 5a. Theduct 7a is the final stretch of thefirst unit 4 which, in a first possible embodiment of it, is described in detail further on in this description. Further, in the final stretch of thesecond unit 6, the second smokable material is fed by means of an air flow and/or by gravity along a substantiallyvertical duct 7b defining a descending flow oftobacco particles 5b. Theduct 7b is the final stretch of thesecond unit 6. - The unit 2 also comprises a
suction conveyor 8 comprising an airpermeable belt 9 which is wound in a loop around achamber 10. Thechamber 10 communicates with a suction unit of known type, not illustrated, and is configured to apply the suction on thebelt 9 at least at some zones, for example through openings made in the wall which delimits the chamber, in known manner and not illustrated. - The
belt 9 is wound aroundpulleys 9a which move it in a direction of travel "A" to define a closed path "P" which follows the lateral profile of the belt itself. - The
first unit 4 is configured to feed the first smokable material along a first stretch "P1" of the path "P" along which thebelt 9 is subjected to the suction applied by thechamber 10. In the embodiment illustrated, thesuction conveyor 8, and in particular thebelt 9, closes the top of theduct 7a so that the first stretch "P1" is located in alower portion 8a of thesuction conveyor 8. - The
second unit 6 is configured to feed the second smokable material along a second stretch "P2" of the path "P" downstream of the first stretch "P1" in the direction of travel "A" of thebelt 9. Along the aforesaid second stretch "P2", thebelt 9 is subjected to the suction applied by thechamber 10. In the embodiment illustrated, thesuction conveyor 8, and in particular thebelt 9, closes the bottom of theduct 7b so that the second stretch "P2" is located in anupper portion 8b of thesuction conveyor 8. - The
numeral 11 denotes shaping means located along a third stretch "P3" of the path "P" downstream of the second stretch "P2" in the direction of travel "A" of thebelt 9. With reference to the embodiment illustrated for example inFigure 1 , where the second stretch "P2" is located in theupper portion 8a of thesuction conveyor 8, the third stretch "P3" is also located in theupper portion 8a of thesuction conveyor 8. - The shaping means 11 are configured to progressively deform the
belt 9 as it advances along the path "P" in such a way as to wrap it around the first smokable material to form thetubular portion 3b of thecoaxial stream 3 around thecore 3a. - The shaping means 11 comprise at least two
side walls 12 configured to support thebelt 9 at least laterally and defining a supportingcavity 13. Transversely to the feed direction "A", the cross section of the supporting cavity changes by closing along the feed direction "A" of thebelt 9 along an initial portion of the third stretch "P3" which extends up to asection 14 for forming thecoaxial stream 3. In the initial portion of the third stretch "P3", thebelt 9 is wound round itself along the feed direction "A" of the belt itself, following the shape of theside walls 12 and of the supportingcavity 13. - Starting from the
section 14 for forming thecoaxial stream 3 along a final portion of the third stretch "P3", the transverse cross section of the supportingcavity 13 changes by opening along the feed direction "A" of thebelt 9. In the final portion of the third stretch "P3", thebelt 9 gradually opens out and returns to its flat shape along the feed direction "A" of the belt itself following the shape of theside walls 12 and of the supportingcavity 13. - At least in the final portion of the third stretch "P3", the
belt 9 is isolated from thechamber 10 so as not to be subjected to suction. In other words, for example starting from thesection 14 for forming thecoaxial stream 3, theside walls 12 meet under thebelt 9 in such a way as to isolate it from thechamber 10, as illustrated inFigures 6 and 7 . - Preferably, in the initial portion of the third stretch "P3", the
belt 9 is placed in communication with thechamber 10 so as to be subjected to suction. In other words, upstream of thesection 14 for forming thecoaxial stream 3, theside walls 12 are spaced apart under thebelt 9, creating achannel 15 in communication with thechamber 10, as illustrated inFigures 4 and 5 . - Preferably, the unit 2 comprises a
levelling device 16 positioned between the first stretch "P1" and the second stretch "P2" and operating on alayer 17a of the first smokable material feeding out of theduct 7a. More specifically, thelevelling device 16 is positioned at thelower portion 8a of thesuction conveyor 8. The desired quantity of tobacco can be measured by the weight control system "W", schematically illustrated inFigure 1 , which adjusts the height of thelevelling device 16. - The unit 2 also comprises a
suction transfer conveyor 18 interposed at the top between thesuction conveyor 8 and arod forming unit 19 which, in a first possible embodiment of it, is described in detail further on in this description. - The
suction transfer conveyor 18 is configured to transfer thecoaxial stream 3 from anupper unloading station 20 of thesuction conveyor 8 along the third stretch "P3" downstream of thesection 14 for forming the coaxial stream to anupper loading station 21 of therod forming unit 19. - The
suction transfer conveyor 18 comprises an airpermeable belt 22 which is wound in a loop around achamber 23. - The
chamber 23 communicates with a suction unit of known type, not illustrated, and is configured to apply the suction on thebelt 22 at least at some zones, for example through openings made in the wall which delimits the chamber, in known manner and not illustrated. Thebelt 23 is wound around pulleys 24 which move it in a direction of travel "B" to define a closed path "P" which follows the lateral profile of the belt itself. Alower stretch 25 of thebelt 22 is configured to partly wrap an upper portion of thecoaxial stream 3 to define a path for transferring the coaxial stream itself. The numeral 26 denotes containment walls associated with thesuction transfer conveyor 18 and extending between the unloadingstation 20 and theloading station 21 in thelower stretch 25 of thebelt 22 for laterally containing thecoaxial stream 3 being transferred by thesuction conveyor 8 to therod forming unit 19. - Preferably, a levelling
device 27 is located along the transfer path to operate on thetubular portion 3b of thecoaxial stream 3. In this case, thecontainment walls 26 advantageously have a break in them at the levellingdevice 27. - With reference to the
loading station 21, thecoaxial stream 3 is disposed on abelt 28 of therod forming unit 19 with acontinuous paper tape 29 interposed between it and the belt. Thepaper tape 29 is fed together with thebelt 28 along a customaryrod forming beam 30 which, in known manner, progressively folds thebelt 28 transversely around thetape 29 and thecoaxial stream 3. When thetape 29 is wrapped all the way round thecoaxial stream 3, the opposite longitudinal ends of thetape 29 are joined to each other in known manner by a gluing device, not illustrated, to form a continuous coaxial rod, which is subsequently cut transversely into segments (not illustrated) by a cutting head (of known type not illustrated) to form cigarettes. -
Figure 11 shows acigarette making machine 1 comprising thefirst feed unit 4 for feeding the first smokable material, thesecond feed unit 6 for feeding the second smokable material and thesuction conveyor 8. - The
first unit 4 comprises an infeed hopper through which the smokable material is fed to afeed duct 31 comprising a conveyingwheel 32. In thefeed duct 31, the flow "F" of material is preferably directed upwards and vertical. - Starting from the conveying
wheel 32, the feed duct divides into afirst feed portion 33 configured to feed thefirst unit 4 and asecond feed portion 34 configured to feed thesecond unit 6. Thus, the first smokable material and the second smokable material coincide. Alternatively, the first and second feed portions may be connected to respective feed ducts, each intended to feed a specific smokable material when the first and second smokable materials are different. One or more conveyingwheels 35 may be disposed along thefirst feed portion 33 and/or thesecond feed portion 34. Suitable suction and/or blowing means are provided along thefeed duct 31 or along the first andsecond feed portions - In use, the first smokable material suitable for forming the
tubular portion 3b of the coaxial stream is fed at the bottom of thesuction conveyor 8, in particular along the first stretch "P1" of the path "P" defined by thebelt 9 of thesuction conveyor 8. Thetobacco 5a coming out of theduct 7a collects on the lower branch of thebelt 9, forming alayer 17a of tobacco whose thickness is adjusted by the levellingdevice 16, which removes the excess of the first smokable material as it passes between the first and the second stretch, as a function of the necessary quantity of tobacco, measured by the weight control system "W" which adjusts the height of the levellingdevice 16. - The second smokable material suitable for forming the core 3a of the
coaxial stream 3 is fed at the top of thesuction conveyor 8, along the second stretch "P2" of the path "P". More specifically, thetobacco 5b falling down along theduct 7b collects on the upper branch of thebelt 9, forming a layer 17b of tobacco. - Preferably, the width of the
layer 17a is comparable to the circumference of the finished cigarette and the width of the layer 17b is comparable to the diameter of thecore 3a. - As it advances along the third stretch "P3" of the path "P", the
belt 9 is progressively deformed in such a way as to wrap it around the first smokable material to form thetubular portion 3b of thecoaxial stream 3 around thecore 3a. More specifically, thebelt 9 is wound round itself along the feed direction "A" as far as thesection 14 for forming thecoaxial stream 3 and then opened out after the forming section. - Preferably, during the opening out step, the
belt 9 is not subjected to suction, that is to say, it is not in communication with thechamber 10. Thecoaxial stream 3 thus obtained is transferred between theupper unloading station 20 of thesuction conveyor 8 and theupper loading station 21 of therod forming unit 19. In transferring thecoaxial stream 3, thebelt 22 of thesuction conveyor 18 is wrapped around at least an upper portion of the coaxial stream, which is suspended along the transfer path and held in place by suction. Thecoaxial stream 3 is kept in shape by thecontainment walls 26 associated with thesuction transfer conveyor 18. The excess of the first smokable material is removed by the levellingdevice 27 while thecoaxial stream 3 is being transferred from thesuction conveyor 8 to therod forming unit 19. The levelling device is adjustable in height by a total weight control unit, of known type and not illustrated, so that once the weight of the tobacco is adjusted by means of the levellingdevice 16, the two tobacco components are precisely measured. Thecoaxial stream 3 received by therod forming unit 19 advances along therod forming beam 30 together with thepaper tape 29 to form the continuous rod. -
Figure 10 shows a possible variant embodiment comprising thefirst feed unit 4 for feeding the first smokable material, preferably in the form of shreddedtobacco 5a, suitable for forming thetubular portion 3b, and asecond feed unit 60 for feeding the second smokable material, suitable for forming thecore 3a in the form of segments of one or more smokable materials, which in the example, are two different smokable materials. - The
second unit 60 comprises arotary element 61 configured to position the segments parallel to the second stretch "P2" of the path "P". Therotary element 61 is fed by one or more loading hoppers 62 (two in the example ofFigure 11 ) and by one ormore sequences 63 of feed drums, preferably spacing adapters. - In this case, in use of the machine, the second smokable material suitable for forming a core 3a of the
coaxial stream 3 is fed by placing an aligned sequence of segments on the upper branch of thebelt 9 to form acore 3a resting on thelayer 17a of tobacco. - The rest of the unit 2 is similar to that described with reference to
Figures 1-9 . -
Figure 13 shows a possible variant embodiment comprising thefirst feed unit 4 for feeding the first smokable material, in the form of shreddedtobacco 5a, suitable for partially forming thetubular portion 3b. More specifically, thefirst unit 4 comprises a substantiallyvertical duct 7a defining an ascending flow of particles of the first smokable material in the form of shreddedtobacco 5a. Thebelt 9, closes the top of theduct 7a so that the first stretch P1 is located in alower portion 8a of thesuction conveyor 8. - The numeral 9' denotes a further air permeable belt which is wound in a loop around a
further chamber 10a communicating with a suction unit and which is movable in a direction of travel A' to define a closed path P'. - A stretch "X1" of the further belt 9' is superposed on the top of a stretch "X" of the
belt 9. - The
second unit 600 comprises feed means, not illustrated, configured to feed, between thebelt 9 and the further belt 9', an elongate element "L" of the second smokable material suitable for forming thecore 3a. - The
reference label 7b denotes a substantially vertical duct defining a descending flow of particles of a third smokable material in the form of shredded tobacco, preferably the same as the first smokable material. - The further belt 9' closes the bottom of the
duct 7b. - As in the other examples described, the
suction transfer conveyor 18 is interposed between thesuction conveyor 8 and therod forming unit 19. Thesuction transfer conveyor 18 is configured to transfer thecoaxial stream 3 and comprises an air permeable belt which is wound in a loop around achamber 23 in communication with a suction unit. In the example illustrated, the further belt 9' itself forms thesuction conveyor 18. - As described above, the
suction conveyor 18 is configured to partly wrap an upper portion of thecoaxial stream 3 and to keep it suspended and held by suction along the transfer path. - In use of the unit according to this embodiment, the first smokable material is fed below the
suction conveyor 8 and the third smokable material, preferably the same as the first smokable material, is fed above the further belt 9'. The elongate element "L" of the second smokable material is fed in such a way as to place it between thebelt 9 and the further belt 9', in particular between the two stretches "X" and "X1". - The
machine 1 illustrated inFigure 11 may be used in conjunction with the embodiment illustrated inFigure 13 . - In a possible alternative embodiment, illustrated for example in
Figure 11a , thebelt 9 is fed by theduct 7a, preferably curved, and the belt 9' is fed by theduct 7b, preferably curved. The two ducts are fed with the same smokable material coming from thefeed duct 31 and divided Into the first andsecond feed portions - The first and
second feed portions machine 1.
Claims (23)
- A unit (2) for forming a coaxial stream (3) for a machine (1) for making coaxial cigarettes, comprising:- a suction conveyor (8) comprising an air permeable belt (9) which is wound in a loop around a chamber (10) communicating with a suction unit and which is movable in a direction of travel ("A") to define a closed path ("P"),- a first unit (4) for feeding a first smokable material suitable for at least partly forming a tubular portion (3b) of the coaxial stream (3), the first unit (4) being configured to feed the first smokable material along a first stretch ("P1") of the path ("P"),- a second unit (6; 60; 600) for feeding a second smokable material suitable for forming a core (3a) of the coaxial stream (3), the second unit (6; 60; 600) being configured to feed the second smokable material along a second stretch ("P2") of the path ("P") downstream of the first stretch ("P1") in the direction of travel ("A") of the belt (9),characterized in that it comprises a suction transfer conveyor (18) interposed between the suction conveyor (8) and a rod forming unit (19), the suction transfer conveyor (18) being configured to transfer the coaxial stream (3), and in that the suction transfer conveyor (18) comprises an air permeable belt (22) which is wound in a loop around a chamber (23) communicating with a suction unit and which is movable in a direction of travel ("B") to define a closed path, where the suction conveyor (18), at a lower stretch of the belt (22), is configured to partly wrap an upper portion of the coaxial stream (3) and to keep it suspended and held by suction along a transfer path.
- The unit (2) according to claim 1, characterized in that it comprises shaping means (11) located along a third stretch ("P3") of the path ("P") downstream of the second stretch ("P2") in the direction of travel ("A") of the belt (9), the shaping means (11) being configured to progressively deform the belt (9) as it advances along the path ("P") in such a way as to wrap it around the first smokable material to form the tubular portion (3b) of the coaxial stream (3) around the core (3a).
- The unit (2) according to claim 2, characterized in that the wrapping means (11) comprise at least two side walls (12) configured to support the belt (9) at least laterally and defining a supporting cavity (13) whose transverse cross section changes by closing along the feed direction ("A") of the belt (9) in an initial portion of the third stretch ("P3") which extends up to a section (14) for forming the coaxial stream (3) and which preferably changes by opening along the feed direction ("A") of the belt (9) starting from the section (14) for forming the coaxial stream in a final portion of the third stretch ("P3").
- The unit (2), according to claim 3, characterized in that at least in the final portion of the third stretch ("P3"), the belt (9) is isolated from the chamber (10) so as not to be subjected to suction.
- The unit (2) according to claim 4, characterized in that in the initial portion of the third stretch ("P3"), the belt (9) is in communication with the chamber (10) so as to be subjected to suction.
- The unit (2) according to one or more of claims 2 to 5, characterized in that at least the second stretch ("P2") and the third stretch ("P3") are located in an upper portion (8b) of the suction conveyor (8).
- The unit (2) according to claim 6, characterized in that the second unit (6) comprises a substantially vertical duct (7b) defining a descending flow of particles of the second smokable material in the form of shredded tobacco (5b) and in that the belt (9) closes the bottom of the duct (7b).
- The unit (2), according to claim 6, characterized in that the second unit (60) comprises a rotary element (61) configured to position pieces of one or more smokable materials parallel to the second stretch ("P2") of the path ("P") and fed by at least one loading hopper (62) and by at least one sequence (63) of feeding drums, preferably spacing adapters.
- The unit (2) according to any one of claims 6-8, characterized in that the first unit (4) comprises a substantially vertical duct (7a) defining an ascending flow of particles of the first smokable material in the form of shredded tobacco (5a) and in that the belt (9) closes the top of the duct (7a) so that the first stretch ("P1") is located in a lower portion (8a) of the suction conveyor (8).
- The unit (2) according to claim 9, characterized in that it comprises a levelling device (16) positioned between the first stretch ("P1") and the second stretch ("P2") and operating on a layer (17a) of the first smokable material feeding out of the duct (7a), the levelling device (16) being preferably adjustable in height by a weight checking system (W).
- The unit (2) according to claim 10, characterized in that the levelling device (16) is positioned at the lower portion (8a) of the suction conveyor (8).
- The unit (2) according to any one of claims 2-11, characterized in that the suction transfer conveyor (18) is interposed at the top between the suction conveyor (8) and the rod forming unit (19), the suction transfer conveyor (18) being configured to transfer the coaxial stream (3) from an upper loading station (20) of the suction conveyor (8) along the third stretch ("P3") downstream of a section (14) for forming the coaxial stream (3) to an upper loading station (21) of the rod forming unit (19).
- The unit (2) according to one or more of the preceding claims and in particular according to claim 12, characterized in that it comprises a levelling device (27) located along the transfer stretch and operating on the tubular portion (3b) of the coaxial stream (3), the levelling device (27) being preferably adjustable in height by a total weight checking device.
- The unit (2) according to claim 1, characterized in that it comprises a further air permeable belt (9') which is wound in a loop around a further chamber (10a) communicating with a suction unit and which is movable in a direction of travel (A') to define a closed path (P'), a stretch of the further belt (9) being superposed at the top on a stretch of the belt (9),
wherein the first unit (4) comprises a substantially vertical duct (7a) defining an ascending flow of particles of the first smokable material in the form of shredded tobacco (5a), wherein the belt (9) closes the top of the duct (7a) so that the first stretch (P1) is located in a lower portion (8a) of the suction conveyor (8),
wherein the second unit (600) comprises feed means configured to feed, between the belt (9) and the further belt (9'), an elongate element (L) of the second smokable material suitable for forming the core (3a),
the unit (2) being characterized in that it comprises a substantially vertical duct (7b) defining a descending flow of particles of a third smokable material in the form of shredded tobacco, preferably the same as the first smokable material, wherein the further belt (9') closes the bottom of the duct (7b). - A method for forming a coaxial stream (3) in a machine for making coaxial cigarettes, comprising the following steps:- feeding a first smokable material suitable for at least partly form a tubular portion (3b) of the coaxial stream (3) in a first stretch ("P1") of a path ("P") defined by a belt (9) of a suction conveyor (8),- feeding a second smokable material suitable for forming a core (3a) of the coaxial stream (3), in a second stretch ("P2") of the path ("P") downstream of the first stretch ("P1") along the direction of travel ("A") of the belt (9), characterized in that it comprises the step of transferring the coaxial stream from the suction conveyor (8) to a rod forming unit (19) along a transfer path and in that it comprises a step of partly wrapping an upper portion of the coaxial stream (3) keeping the coaxial stream (3) suspended and held by suction along the transfer path.
- The method according to claim 15, characterized in that it comprises the step of progressively deforming the belt (9) as it advances along a third stretch ("P3") of the path ("P") downstream of the second stretch ("P2") in the direction of travel ("A) of the belt itself, in such a way as to wrap it around the first smokable material to form the tubular portion (3b) of the coaxial stream (3) around the core (3a).
- The method according to claim 16, characterized by closing the belt (9) on itself along the feed direction ("A") of the belt (9) itself in an initial portion of the third stretch ("P3") which extends up to a forming section (14) of the coaxial stream (3) and opening the belt (9) along the feed direction ("A") of the belt (9) starting from the section (14) for forming the coaxial stream (3) in a final portion of the third stretch ("P3"), the method being further characterized in that it at least in the final portion of the third stretch ("P3") the belt (9) is not subjected to suction.
- The method according to one or both of claims 16-17, characterized in that at least the second stretch ("P2") and the third stretch ("P3") are located in an upper portion (8b) of the suction conveyor (8), the second smokable material being fed above the suction conveyor (8).
- The method according to claim 18, characterized in that the first stretch ("P1") is located in a lower portion (8a) of the suction conveyor (8), the first smokable material being fed below the suction conveyor (8).
- The method according to claim 19, characterized in that it comprises a step of removing the excess of the first smokable material between the first stretch ("P1") and the second stretch ("P2") as a function of a weight check on the first smokable material.
- The method according to one or more of claims 16-20, characterized in that it comprises transferring the coaxial stream from an upper loading station (20) of the suction conveyor (8) located in the third stretch ("P3") downstream of a section (14) for forming the coaxial stream (3) to an upper loading station (21) of a rod forming unit (19).
- The method according to one or more of claims 16-21, characterized in that it comprises a step of removing the excess of the first smokable material while the coaxial stream (3) is transferred from the suction conveyor (8) to the rod forming unit (19) preferably as a function of a total weight check.
- The method according to claim 15, characterized in that- the first smokable material is fed below the suction conveyor (8), the first stretch ("P1") being located in a lower portion (8a) of the suction conveyor (8),- a third smokable material, preferably the same as the first smokable material, is fed above a further air permeable belt (9') which is wound in a loop around a further chamber (10a) communicating with a suction unit and which is movable in a direction of travel (A') to define a closed path (P'), a stretch of the further belt (9) being superposed at the top on a stretch of the belt (9),- feeding an elongate element (L) of the second smokable material suitable for forming the core (3a) in such a way as to position it between the belt (9) and the further belt (9').
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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ITUA2016A003538A ITUA20163538A1 (en) | 2016-05-18 | 2016-05-18 | Unit and procedure for forming a coaxial cord for a coaxial cigarette packaging machine. |
Publications (2)
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EP3245884A1 EP3245884A1 (en) | 2017-11-22 |
EP3245884B1 true EP3245884B1 (en) | 2018-12-05 |
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EP17171321.7A Active EP3245884B1 (en) | 2016-05-18 | 2017-05-16 | Unit and method for forming a coaxial stream in a machine for making coaxial cigarettes |
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IT202100007073A1 (en) * | 2021-03-24 | 2022-09-24 | Gd Spa | MACHINE AND METHOD FOR THE PRODUCTION OF A CONTINUOUS BEAD OF THE TOBACCO INDUSTRY |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2633119A1 (en) * | 1977-12-30 | 1978-02-02 | Bat Cigarettenfab Gmbh | METHOD OF MANUFACTURING A CIGARETTE |
IT1178560B (en) * | 1983-10-12 | 1987-09-09 | Hauni Werke Koerber & Co Kg | PROCEDURE AND DEVICE FOR FORMING A TOBACCO AND CIGARETTE STRIP, PRODUCED BY SUCH A TYPE OF PROCEDURE |
DE4107522C2 (en) | 1991-03-08 | 1994-02-17 | Bat Cigarettenfab Gmbh | Coaxial cigarette |
GB9119938D0 (en) * | 1991-09-17 | 1991-10-30 | Rothmans Int Tobacco | Process and apparatus for manufacturing a rod of smoking material |
FR2719980B1 (en) * | 1994-05-19 | 1998-11-06 | Molins Plc | Improvements to cigarette making machines. |
DE19854364A1 (en) * | 1998-11-25 | 2000-05-31 | Hauni Maschinenbau Ag | Method and device for producing coaxial cigarettes |
ATE547016T1 (en) * | 2001-11-05 | 2012-03-15 | Japan Tobacco Inc | SLOW BURNING CIGARETTE |
US8573230B2 (en) | 2005-12-12 | 2013-11-05 | Philip Morris Usa Inc. | Smoking article with coaxial tobacco rod |
DE102013220757B3 (en) * | 2013-10-15 | 2015-01-15 | Hauni Maschinenbau Ag | Koaxialzigarettenherstellung |
-
2016
- 2016-05-18 IT ITUA2016A003538A patent/ITUA20163538A1/en unknown
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2017
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