WO2008062301A1 - A method for manufacturing pouches of cohesionless material - Google Patents

A method for manufacturing pouches of cohesionless material Download PDF

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Publication number
WO2008062301A1
WO2008062301A1 PCT/IB2007/003606 IB2007003606W WO2008062301A1 WO 2008062301 A1 WO2008062301 A1 WO 2008062301A1 IB 2007003606 W IB2007003606 W IB 2007003606W WO 2008062301 A1 WO2008062301 A1 WO 2008062301A1
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WO
WIPO (PCT)
Prior art keywords
tobacco
station
pouches
conveyor
transfer
Prior art date
Application number
PCT/IB2007/003606
Other languages
French (fr)
Other versions
WO2008062301A8 (en
Inventor
Fulvio Boldrini
Original Assignee
Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A. filed Critical Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A.
Priority to US12/312,652 priority Critical patent/US8151802B2/en
Priority to DK07825719.3T priority patent/DK2097320T3/en
Priority to EP07825719.3A priority patent/EP2097320B1/en
Priority to CN200780043124.6A priority patent/CN101553401B/en
Publication of WO2008062301A1 publication Critical patent/WO2008062301A1/en
Publication of WO2008062301A8 publication Critical patent/WO2008062301A8/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B29/00—Packaging of materials presenting special problems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/04—Methods of, or means for, filling the material into the containers or receptacles
    • B65B1/16—Methods of, or means for, filling the material into the containers or receptacles by pneumatic means, e.g. by suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/30—Devices or methods for controlling or determining the quantity or quality or the material fed or filled
    • B65B1/36—Devices or methods for controlling or determining the quantity or quality or the material fed or filled by volumetric devices or methods
    • B65B1/363—Devices or methods for controlling or determining the quantity or quality or the material fed or filled by volumetric devices or methods with measuring pockets moving in an endless path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B37/00—Supplying or feeding fluent-solid, plastic, or liquid material, or loose masses of small articles, to be packaged
    • B65B37/14—Supplying or feeding fluent-solid, plastic, or liquid material, or loose masses of small articles, to be packaged by pneumatic feeders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/306—Counter-rotating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
    • B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
    • B65B61/08—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting using rotary cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/213—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web having intermittent motion

Definitions

  • the present invention relates to a method of manufacturing individual bags or sachets of cohesionless material, and more precisely, pouches of nasal snuff, or of moist snuff (also known as snus) for oral use.
  • the prior art embraces machines of the type in question, which comprise a dispensing disc rotatable intermittently about a vertical axis and furnished with a ring of cavities, each containing a quantity or portion of tobacco that will correspond to the contents of a single pouch.
  • the portions are released into the single cavities at a filling station by a hopper containing a supply of powdered tobacco, en masse, treated with flavouring and moisturizing agents. Downstream of the filling station, the machine comprises skimming means designed to remove any excess tobacco from each of the cavities.
  • the cavities are carried beyond the skimming means and fed in succession to a station where the single portion of tobacco contained in each cavity is transferred to a further processing stage.
  • pneumatic means comprising a nozzle positioned above the dispensing disc. At each pause in the movement of the disc, a portion of tobacco is ejected by the nozzle from the relative cavity and directed into a duct, of which the mouth lies beneath the disc and in alignment with the nozzle, thence toward a station where the single pouches are formed.
  • the forming station comprises a tubular element, placed at the outlet of the duct and functioning as a mandrel on which to fashion a tubular envelope of paper wrapping material.
  • the material in question consists in a continuous web of paper decoiled from a roll and fed in a direction parallel to the axis of the tubular element, which is wrapped progressively around the element and sealed longitudinally.
  • the machine is equipped with transverse sealing means of which the operation is synchronized with the transfer of the tobacco portions, in such a way that each successive portion will be sealed in a relative segment of the continuous tubular envelope of wrapping material delimited by two successive transverse seals.
  • the successive tubular segments of wrapping material formed as pouches containing respective portions of tobacco, are separated into discrete units through the action of cutting means positioned downstream of the transverse sealing means.
  • the object of the present invention accordingly, is to provide a method and a relative machine for manufacturing single pouches of tobacco, such as will be unaffected by the drawbacks mentioned above in connection with machines of the prior art, and therefore able to combine a high production tempo with accurate and constantly repeatable dispensing of the tobacco portions contained in each of the single pouches, whatever the size of the selfsame portions.
  • the stated object is realized, according to the present invention, in a method for manufacturing pouches of cohesionless material, as characterized in one or more of the claims appended.
  • -figure 1 shows a machine in accordance with the present invention, viewed schematically in perspective and illustrated in a first embodiment
  • -figure Ia shows a detail of the machine in figure 1, viewed schematically and with certain parts cut away to reveal others;
  • -figure Ib shows the detail of figure Ia in plan view from beneath;
  • -figure 2 shows a machine in accordance with the present invention, viewed schematically in perspective and illustrated in a second embodiment
  • -figure 3 shows a third embodiment of a machine according to the present invention, viewed schematically in elevation.
  • numeral 1 denotes a machine for manufacturing pouches 2 containing a cohesionless material, in particular a smokeless tobacco product.
  • the machine 1 comprises a hopper 3 filled with the material in question, and conveying means 4 in the form of a conveyor 5 embodied as a dispensing disc, denoted 5 a, furnished with a plurality of pockets 6 fashioned as bottomless cavities 7 of circular shape arranged around the periphery.
  • a conveyor 5 embodied as a dispensing disc, denoted 5 a, furnished with a plurality of pockets 6 fashioned as bottomless cavities 7 of circular shape arranged around the periphery.
  • the dispensing disc 5a rotates intermittently and anticlockwise (as viewed in figure 1) about a relative axis X, between a delivery station 8 beneath the hopper 3, where each cavity 7 is filled with a predetermined portion 100 of tobacco, and a transfer station 9 at which the successive portions 100 of tobacco are ejected from the cavities 7.
  • the machine 1 further comprises a form-fill-and-seal wrapping station 10 where the portions 100 of tobacco removed from the transfer station 9 are taken up and enclosed in respective pouches 2. Also indicated in figure 1 are interconnecting means 11, embodied as a rectilinear duct 12, interposed between the transfer station 9 and the wrapping station 10.
  • Numeral 13 denotes skimming means located downstream of the hopper 3, as referred to the direction of rotation of the disc, and serving to remove any excess quantity of tobacco from the cavity 7.
  • the transfer station 9 is equipped with pneumatic forcing means 14, located above the disc 5a, comprising a tubular element 15 of diameter substantially equal to the diameter of the cavities 7, aligned on a vertical axis and divided internally by radial walls 15a into four sectors 15b, which is connected uppermost to a source of compressed air (not illustrated).
  • pneumatic forcing means 14 located above the disc 5a, comprising a tubular element 15 of diameter substantially equal to the diameter of the cavities 7, aligned on a vertical axis and divided internally by radial walls 15a into four sectors 15b, which is connected uppermost to a source of compressed air (not illustrated).
  • the wrapping station 10 comprises a tubular mandrel 16 positioned at the outlet end of the rectilinear duct 12, around which a continuous web 17 of wrapping material is formed into tubular envelope 18.
  • the web of material 17 is decoiled from a roll (not illustrated) and wrapped around the tubular mandrel 16, by degrees, through the agency of suitable folding means.
  • the machine 1 also comprises sealing means 20 located beneath the tubular mandrel 16, of which the function is to bond the tubular envelope 18 transversely and thus form a continuous succession 21 of pouches 2, each containing a single portion 100 of tobacco.
  • the transverse sealing means 20 are followed downstream by a pair of transport belts 22 looped around respective pairs of pulleys 22a, serving to advance the continuous succession 21 of pouches 2 toward cutting means 23 by which the single pouches 2 of the selfsame succession 21 are divided one from the next.
  • the cavities 7 are directed one by one under the hopper 3 and filled with respective portions 100 of tobacco, each destined to provide the contents of one pouch 2.
  • Each cavity 7 then passes under the skimming means 13, which will remove any excess tobacco released from the hopper.
  • the cavities 7 advance in succession toward the transfer station 9 and are positioned under the tubular element 15.
  • a pneumatic selector schematized in figure 1 as a block 14a, connects the four sectors 15b of the tubular element 15 sequentially to the source of compressed air in such a way that corresponding jets are directed in succession onto different areas of the portion 100 of tobacco contained in the cavity 7.
  • the portion 100 of tobacco is removed by degrees from the respective cavity 7 and directed gradually into the duct 12 beneath.
  • the portion 100 of tobacco passes along the rectilinear connecting duct 12 and into the tubular mandrel 16, which is ensheathed by the web 17 of wrapping material.
  • the envelope 18 of paper is sealed lengthwise by the ultrasonic welders 19, and crosswise, at the outlet end of the tubular mandrel 16, by the transverse sealing means 20.
  • transverse sealing means 20 The operation of the transverse sealing means 20 is intermittent, and timed to match the frequency at which successive portions 100 of tobacco are fed into the transfer station 9, in such a way that each portion 100 of tobacco will be enclosed between two successive transverse seals.
  • the pockets of the dispensing disc 5a are fashioned as elongated slots 24 and the forcing means 14 consist in a single pneumatic nozzle 25positioned at the transfer station 9. hi this instance, the portions 100 of tobacco are transferred from the slots 24 to the duct 12 with the disc 5a in rotation, as each single slot 24 passes beneath the nozzle 25.
  • the conveying means 4 appear as a drum 26 rotatable intermittently and anticlockwise, as viewed in figure 3, about a horizontal axis A.
  • the drum 26 is interposed between a bottom end of the hopper 3, delimited by two side walls 3a and 3b, and the transfer station 9.
  • the drum 26 presents a cylindrical wall 27 with a band 28 of predetermined width rendered permeable to air by a plurality of through holes 28a.
  • the enclosure 29 delimited by the cylindrical wall 27 is divided by two radial walls 29a and 29b into two sectors, denoted 30 and 31.
  • the remaining sector 31, positioned adjacent to and above the transfer station 9, is angularly complementary to the first sector 30 and connected by way of a further duct 31a to a source of compressed air (not illustrated).
  • the air-permeable band 28 will gradually collect a continuous stream 32 of tobacco, which is kept at a prescribed and constant thickness through the action of a levelling roller 33 rotating similarly anticlockwise about an axis B parallel to the axis A aforementioned, internally of the hopper 3 and adjacent to one side wall 3a.
  • the continuous stream 32 advances between two side panels 34 extending concentrically with the drum 26 as far as the transfer station 9, where a given length of the stream 32, corresponding in quantity to one portion 100, will be detached gradually from the drum by a jet of compressed air forced through the holes 28a of the air-permeable band 28, and directed into the duct 12 in the manner described previously with reference to other embodiments.
  • forcing means 14 which are pneumatic in the various embodiments described thus far, might also be of mechanical design.
  • figure Ic illustrates an alternative solution to that of figure 1, in which the forcing means 14 are embodied as a plunger 35 invested with reciprocating motion and insertable through the cavities 7 of the dispensing disc 5a when positioned at the transfer station 9.
  • the penetrating end of the plunger 35 presents a shape, for example skew, such as will allow the portion 100 of tobacco to be engaged and displaced from the cavity by degrees, as described previously with reference to other embodiments.
  • forcing means 14 might consist in a combination of mechanical and pneumatic means operating on different parts of the single portion 100, at the transfer station.
  • the conveying means will consist either in a disc with two rings of cavities, or a drum with two air-permeable bands, in such a way that two portions of tobacco can be supplied simultaneously to the transfer station, and each then directed into a respective duct.
  • the aforementioned drawbacks connected with the prior art can be overcome, inasmuch as the portions of tobacco can be transferred correctly, even when relatively large, with no risk of blockages occurring along the connecting duct that would dictate a stoppage of the machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quality & Reliability (AREA)
  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)
  • Manufacture Of Tobacco Products (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

Pouches (2) of cohesionless material, typically a smokeless tobacco product, are manufactured by conveying portions of the tobacco initially on a dispensing disc (5a) with cavities (7) from a delivery station (8) to a transfer station (9), where each portion of tobacco is then removed forcibly from the relative cavity by an ejection system (14) and directed into a duct (12) connecting with a wrapping station (10) at which the pouches (2) are formed, filled and sealed; the removal and transfer of each portion from the cavity (7) of the disc (5a) into the duct (12) is controlled in such a way as to displace the material by degrees and ensure its smooth passage toward the wrapping station.

Description

Description
A method for manufacturinR pouches of cohesionless material
Technical Field
The present invention relates to a method of manufacturing individual bags or sachets of cohesionless material, and more precisely, pouches of nasal snuff, or of moist snuff (also known as snus) for oral use.
Reference is made explicitly to tobacco in the course of the following specification, albeit no limitation in scope is implied, as the cohesionless material might consist similarly, for example, in powdered pharmaceutical or confectionery products treated with moisturizing agents.
Background Art
The prior art embraces machines of the type in question, which comprise a dispensing disc rotatable intermittently about a vertical axis and furnished with a ring of cavities, each containing a quantity or portion of tobacco that will correspond to the contents of a single pouch.
The portions are released into the single cavities at a filling station by a hopper containing a supply of powdered tobacco, en masse, treated with flavouring and moisturizing agents. Downstream of the filling station, the machine comprises skimming means designed to remove any excess tobacco from each of the cavities.
With the disc in rotation, the cavities are carried beyond the skimming means and fed in succession to a station where the single portion of tobacco contained in each cavity is transferred to a further processing stage. Installed at this same transfer station are pneumatic means comprising a nozzle positioned above the dispensing disc. At each pause in the movement of the disc, a portion of tobacco is ejected by the nozzle from the relative cavity and directed into a duct, of which the mouth lies beneath the disc and in alignment with the nozzle, thence toward a station where the single pouches are formed.
The forming station comprises a tubular element, placed at the outlet of the duct and functioning as a mandrel on which to fashion a tubular envelope of paper wrapping material.
The material in question consists in a continuous web of paper decoiled from a roll and fed in a direction parallel to the axis of the tubular element, which is wrapped progressively around the element and sealed longitudinally.
Beyond the tubular element, the machine is equipped with transverse sealing means of which the operation is synchronized with the transfer of the tobacco portions, in such a way that each successive portion will be sealed in a relative segment of the continuous tubular envelope of wrapping material delimited by two successive transverse seals.
The successive tubular segments of wrapping material, formed as pouches containing respective portions of tobacco, are separated into discrete units through the action of cutting means positioned downstream of the transverse sealing means.
It has been found impossible, utilizing machines of the type outlined above, to guarantee that the quantities of tobacco supplied to the form-fill-and-seal station will be portioned accurately and repeatedly over time.
This is due to the fact, especially when the size of the single portion increases beyond certain limits and the moisture content of the tobacco exceeds given values (typically 30%), that the aforementioned pneumatic ejection means cannot be guaranteed either to remove the contents of the single cavities completely, or to ensure that the portions of tobacco will pass correctly along the connecting duct; consequently, there is a risk that blockages may occur.
Disclosure of Invention
The object of the present invention, accordingly, is to provide a method and a relative machine for manufacturing single pouches of tobacco, such as will be unaffected by the drawbacks mentioned above in connection with machines of the prior art, and therefore able to combine a high production tempo with accurate and constantly repeatable dispensing of the tobacco portions contained in each of the single pouches, whatever the size of the selfsame portions. The stated object is realized, according to the present invention, in a method for manufacturing pouches of cohesionless material, as characterized in one or more of the claims appended.
Short Description of the Drawings
The invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which:
-figure 1 shows a machine in accordance with the present invention, viewed schematically in perspective and illustrated in a first embodiment;
-figure Ia shows a detail of the machine in figure 1, viewed schematically and with certain parts cut away to reveal others; -figure Ib shows the detail of figure Ia in plan view from beneath;
-figure Ic shows a detail of the machine in figure 1, viewed schematically and with certain parts seen in section, and illustrated in a second embodiment;
-figure 2 shows a machine in accordance with the present invention, viewed schematically in perspective and illustrated in a second embodiment; -figure 3 shows a third embodiment of a machine according to the present invention, viewed schematically in elevation.
Detailed Description of the Preferred Embodiment of the Invention
With reference to figure 1, numeral 1 denotes a machine for manufacturing pouches 2 containing a cohesionless material, in particular a smokeless tobacco product.
The machine 1 comprises a hopper 3 filled with the material in question, and conveying means 4 in the form of a conveyor 5 embodied as a dispensing disc, denoted 5 a, furnished with a plurality of pockets 6 fashioned as bottomless cavities 7 of circular shape arranged around the periphery.
The dispensing disc 5a rotates intermittently and anticlockwise (as viewed in figure 1) about a relative axis X, between a delivery station 8 beneath the hopper 3, where each cavity 7 is filled with a predetermined portion 100 of tobacco, and a transfer station 9 at which the successive portions 100 of tobacco are ejected from the cavities 7.
The machine 1 further comprises a form-fill-and-seal wrapping station 10 where the portions 100 of tobacco removed from the transfer station 9 are taken up and enclosed in respective pouches 2. Also indicated in figure 1 are interconnecting means 11, embodied as a rectilinear duct 12, interposed between the transfer station 9 and the wrapping station 10.
Numeral 13 denotes skimming means located downstream of the hopper 3, as referred to the direction of rotation of the disc, and serving to remove any excess quantity of tobacco from the cavity 7.
Referring to figure 1 and Ia, the transfer station 9 is equipped with pneumatic forcing means 14, located above the disc 5a, comprising a tubular element 15 of diameter substantially equal to the diameter of the cavities 7, aligned on a vertical axis and divided internally by radial walls 15a into four sectors 15b, which is connected uppermost to a source of compressed air (not illustrated).
The wrapping station 10 comprises a tubular mandrel 16 positioned at the outlet end of the rectilinear duct 12, around which a continuous web 17 of wrapping material is formed into tubular envelope 18. The web of material 17 is decoiled from a roll (not illustrated) and wrapped around the tubular mandrel 16, by degrees, through the agency of suitable folding means.
The edges of the web are joined and sealed longitudinally to form the tubular envelope 18 by ultrasonic welders 19 located in close proximity to the tubular mandrel 16. Referring to figures 1 and 2, the machine 1 also comprises sealing means 20 located beneath the tubular mandrel 16, of which the function is to bond the tubular envelope 18 transversely and thus form a continuous succession 21 of pouches 2, each containing a single portion 100 of tobacco. The transverse sealing means 20 are followed downstream by a pair of transport belts 22 looped around respective pairs of pulleys 22a, serving to advance the continuous succession 21 of pouches 2 toward cutting means 23 by which the single pouches 2 of the selfsame succession 21 are divided one from the next.
In operation, with the disc 5a set in rotation, the cavities 7 are directed one by one under the hopper 3 and filled with respective portions 100 of tobacco, each destined to provide the contents of one pouch 2.
Each cavity 7 then passes under the skimming means 13, which will remove any excess tobacco released from the hopper.
Thereafter, the cavities 7 advance in succession toward the transfer station 9 and are positioned under the tubular element 15.
At this point, a pneumatic selector, schematized in figure 1 as a block 14a, connects the four sectors 15b of the tubular element 15 sequentially to the source of compressed air in such a way that corresponding jets are directed in succession onto different areas of the portion 100 of tobacco contained in the cavity 7.
As a result, the portion 100 of tobacco is removed by degrees from the respective cavity 7 and directed gradually into the duct 12 beneath.
Forced downward by the air jets, the portion 100 of tobacco passes along the rectilinear connecting duct 12 and into the tubular mandrel 16, which is ensheathed by the web 17 of wrapping material.
The envelope 18 of paper is sealed lengthwise by the ultrasonic welders 19, and crosswise, at the outlet end of the tubular mandrel 16, by the transverse sealing means 20.
The operation of the transverse sealing means 20 is intermittent, and timed to match the frequency at which successive portions 100 of tobacco are fed into the transfer station 9, in such a way that each portion 100 of tobacco will be enclosed between two successive transverse seals.
Thus, a continuous succession 21 of tobacco-filled pouches 2 will emerge, connected one to the next by way of the transverse seals. At a given point downstream of the transverse sealing means 20, the single pouches 2 are separated one from the next by the cutting means 23.
In the embodiment of figure 2, the pockets of the dispensing disc 5a are fashioned as elongated slots 24 and the forcing means 14 consist in a single pneumatic nozzle 25positioned at the transfer station 9. hi this instance, the portions 100 of tobacco are transferred from the slots 24 to the duct 12 with the disc 5a in rotation, as each single slot 24 passes beneath the nozzle 25.
Likewise in this solution, the transfer of the portions 100 of tobacco into the rectilinear duct 12 occurs gradually. hi a further embodiment (see figure 3), the conveying means 4 appear as a drum 26 rotatable intermittently and anticlockwise, as viewed in figure 3, about a horizontal axis A. The drum 26 is interposed between a bottom end of the hopper 3, delimited by two side walls 3a and 3b, and the transfer station 9.
The drum 26 presents a cylindrical wall 27 with a band 28 of predetermined width rendered permeable to air by a plurality of through holes 28a.
The enclosure 29 delimited by the cylindrical wall 27 is divided by two radial walls 29a and 29b into two sectors, denoted 30 and 31.
A first sector 30, located adjacent to the outlet of the hopper 3 and extending around to the transfer station 9, is connected by way of a duct 30a to a source of negative pressure (not illustrated).
The remaining sector 31, positioned adjacent to and above the transfer station 9, is angularly complementary to the first sector 30 and connected by way of a further duct 31a to a source of compressed air (not illustrated).
In operation, with the drum 26 set in rotation and exposed to the aspirating action of the negative pressure source, the air-permeable band 28 will gradually collect a continuous stream 32 of tobacco, which is kept at a prescribed and constant thickness through the action of a levelling roller 33 rotating similarly anticlockwise about an axis B parallel to the axis A aforementioned, internally of the hopper 3 and adjacent to one side wall 3a. The continuous stream 32 advances between two side panels 34 extending concentrically with the drum 26 as far as the transfer station 9, where a given length of the stream 32, corresponding in quantity to one portion 100, will be detached gradually from the drum by a jet of compressed air forced through the holes 28a of the air-permeable band 28, and directed into the duct 12 in the manner described previously with reference to other embodiments.
It will be seen that the forcing means 14, which are pneumatic in the various embodiments described thus far, might also be of mechanical design.
In effect, figure Ic illustrates an alternative solution to that of figure 1, in which the forcing means 14 are embodied as a plunger 35 invested with reciprocating motion and insertable through the cavities 7 of the dispensing disc 5a when positioned at the transfer station 9. hi this embodiment, the penetrating end of the plunger 35 presents a shape, for example skew, such as will allow the portion 100 of tobacco to be engaged and displaced from the cavity by degrees, as described previously with reference to other embodiments.
Finally, the forcing means 14 might consist in a combination of mechanical and pneumatic means operating on different parts of the single portion 100, at the transfer station.
The elements of the design as described above are readily applicable to a twin track type of machine. hi this instance, the conveying means will consist either in a disc with two rings of cavities, or a drum with two air-permeable bands, in such a way that two portions of tobacco can be supplied simultaneously to the transfer station, and each then directed into a respective duct. Self-evidently, adopting the method and the machine according to the present invention, the aforementioned drawbacks connected with the prior art can be overcome, inasmuch as the portions of tobacco can be transferred correctly, even when relatively large, with no risk of blockages occurring along the connecting duct that would dictate a stoppage of the machine.

Claims

Claims
1) A method for manufacturing pouches (2) of cohesionless material, including the steps of:
- feeding the cohesionless material, by way of conveying means (4), from a delivery station (8) to a transfer station (9); - transferring predetermined portions (100) of the material, through the agency of forcing means (14) operating at the transfer station (9), from the conveyor means (4) to at least one duct (12) connecting with a wrapping station (10) where the pouches (2) are formed, filled and sealed, characterized in that the transfer step consists in removing the portion (100) by degrees from the conveyor means (4), in such a way that the selfsame portion (100) will be directed gradually into the duct (12).
2) A method as in claim 1, wherein the forcing means (14) employed in effecting the transfer step are pneumatic means.
3) A method as in claim 2, wherein the feeding step includes a step of filling the cavities (7) of a rotary conveyor (5) constituting the conveying means (4), with quantities of tobacco corresponding to the predetermined portions (100).
4) A method as in claim 3, wherein the feeding step includes a step of filling the cavities (7) of a rotary dispensing disc (5a) constituting the conveying means (4), with quantities of tobacco corresponding to the predetermined portions (100).
5) A method as in claim 3 or 4, wherein the step of transferring each portion (100) effected by the pneumatic means (14) consists in causing the material making up the portion (100) to be ejected gradually from the relative cavity (7).
6) A method as in claim 3 or 4, wherein the step of transferring each portion (100) is effected with the conveyor (5) stationary.
7) A method as in claim 3 or 4, wherein the step of transferring each portion (100) is effected with the conveyor (5) in rotation.
8) A method as in claim 1 or 2, wherein the feeding step includes a step of forming a continuous stream (32) of the cohesionless material on aspirating conveyor means (26).
9) A method as in claim 8, wherein the transfer step includes a step of causing a given fraction of the continuous stream (32), corresponding in quantity to the predetermined portion (100), to be removed from the aspirating conveyor means (26) by the pneumatic means (14) at the transfer station (9).
PCT/IB2007/003606 2006-11-22 2007-11-19 A method for manufacturing pouches of cohesionless material WO2008062301A1 (en)

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DK07825719.3T DK2097320T3 (en) 2006-11-22 2007-11-19 PROCEDURE FOR MANUFACTURING BAGS WITH COHESIONLESS MATERIAL
EP07825719.3A EP2097320B1 (en) 2006-11-22 2007-11-19 A method for manufacturing pouches of cohesionless material
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IT000792A ITBO20060792A1 (en) 2006-11-22 2006-11-22 METHOD FOR THE PRODUCTION OF BAGS OF UNCONTROL MATERIAL.
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EP2138056A2 (en) 2008-06-26 2009-12-30 eswegee Vliesstoff GmbH Non-woven material for use as moisture-permeable, microporous luxury food packaging
US9067697B2 (en) 2008-11-07 2015-06-30 Hauni Maschinenbau Ag Device and method for metering tobacco in portions suitable for packaging
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WO2012052038A1 (en) 2010-10-19 2012-04-26 Hauni Maschinenbau Ag Apportioning device and method for apportioning ground or cut tobacco material
WO2012092937A1 (en) * 2011-01-07 2012-07-12 Hauni Maschinenbau Ag Feeding ground or cut tobacco material to a portioning device
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DK2097320T3 (en) 2016-07-25
WO2008062301A8 (en) 2009-08-27
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US8151802B2 (en) 2012-04-10
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