US3088467A - Method of forming a continuous tobacco filler - Google Patents

Method of forming a continuous tobacco filler Download PDF

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Publication number
US3088467A
US3088467A US139827A US13982761A US3088467A US 3088467 A US3088467 A US 3088467A US 139827 A US139827 A US 139827A US 13982761 A US13982761 A US 13982761A US 3088467 A US3088467 A US 3088467A
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US
United States
Prior art keywords
tobacco
conveyor
filler
passage
continuous
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.)
Expired - Lifetime
Application number
US139827A
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English (en)
Inventor
Lanore Raymond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Usines Decoufle SA
Original Assignee
Usines Decoufle SA
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
Priority to NL128335D priority Critical patent/NL128335C/xx
Priority to NL298514D priority patent/NL298514A/xx
Priority to FR1179992D priority patent/FR1179992A/fr
Priority to GB6407/57A priority patent/GB854736A/en
Priority to GB14133/60A priority patent/GB854737A/en
Priority to GB26496/60A priority patent/GB854738A/en
Priority claimed from US702104A external-priority patent/US3030966A/en
Priority to CH351208D priority patent/CH351208A/fr
Priority to CH358023D priority patent/CH358023A/fr
Application filed by Usines Decoufle SA filed Critical Usines Decoufle SA
Priority to US139827A priority patent/US3088467A/en
Publication of US3088467A publication Critical patent/US3088467A/en
Application granted granted Critical
Priority to MY1964138A priority patent/MY6400138A/xx
Priority to MY1964135A priority patent/MY6400135A/xx
Priority to MY1966113A priority patent/MY6600113A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A24C5/1842—Trimming devices

Definitions

  • One diiculty that arises in the formation of a continuous tobacco iller by known methods is the tendency for the ller to contain varying quantities of tobacco along its length.
  • continuous rod cigarette-making machines it is usual to shower cut tobacco on to a travelling conveyor so as .to form a loose tobacco stream which is subsequently compressed laterally and enclosed in a continuous web of cigarette paper to form a continuous cigarette rod.
  • the loose stream formed on the conveyor is usually irregular in that the quantity of tobacco varies from point to point along its length, and these irregularities are generally also found, to a greater or less extent, in the filler of the wrapped cigarette rod, in spite of various means which have been used to improve the uniformity of the tobacco ller before it is enclosed in the paper wrapper.
  • the present invention is directed to the problem of forming a tobacco ller of improved uniformity.
  • the present invention provides a method of producing a continuous tobacco tiller by trimming a tobacco stream to a desired cross-sectional size, the stream being conveyed from a position at which it has been built up, to a trimming position, While subjecting it to air pressure directed against the tobacco in a direction transverse to the direction of movement of the stream.
  • the air-pressure may be applied by applying suction to a conveyor carrying the stream, which effects substantial lateral compression of the stream, for example, to a density at least half that required in the final product of the machine (e.g. a cigarette).
  • tobacco ller and tobacco rod are intended to designate the narrow stream (conventionally formed by showering tobacco particles on a conveyor), which stream is fed toward cigarette rod forming mechanism in which cigarette paper is wrapped around the tobacco rod to form the continuous 'nislied cigarette rod.
  • FIGURE l is a sectional end eleva-tion diagrammatically illustrating apparatus according to the invention.
  • FIGURE 2 is a sectional front elevation
  • FIGURE 3 is a plan view of part of the apparatus shown in FIGURES 1 and 2;
  • FIGURE 4 is a sectional view taken along the line IV-IV, FIGURE 2;
  • FIGURE 5 is a sectional View taken along the line V-V, FIGURE 2;
  • FIGURE 6 is a sectional view taken along the line VI-VI, FIGURE 5.
  • the apparatus comprises a hopper 1 for cut tobacco, a conveyor belt 2 to support tobacco in the hopper, and a carded roller 3 towards which tobacco is urged by the conveyor belt 2, which move in the direction shown by the arrow.
  • a brushing or levelling roller 4 is located adjacent the roller 3' and rotates in the same direction, as indicated by the arrows on the rollers 3 and 4.
  • a picker roller 5 is arranged close to the roller 3 and is rotatable so as to pick tobacco from the carding of the roller 3 and distribute it on an endless conveyor belt 6.
  • the conveyor 6 is arranged to move in the direction of the arrow at a speed of 4 feet per second.
  • the passage 8 which extends along the whole width of the conveyor belt 6, see FIGURE 2.
  • the passage 8 comprises opposed walls, spaced 10 mm. apart, whose opposed surfaces are slippery to reduce friction. These walls extend upwardly and their upper extremities are connected to a pair of side guides or walls which form a channel 9, as best seen in FIGURE 4.
  • the walls of the channel 9 have slippery opposed surfaces, the upper parts of which are convergent (considered in a downward direction), each being at an angle of 10 to rthe vertical.
  • the conveyor belt l0 is perforated, being provided with small holes each of a diameter of 0.8 yto 1.2 mm. About 40 such holes per square centimetre of the entire surface of the belt are provided.
  • the belt 10 is held within the channel 9 by the lower surfaces of a pair of opposed elements 14, which overhang the Walls of the channel 9 by about 1 mm. on each side, thus forming shoulders which guide the belt through the channel.
  • the channel 9 and conveyor belt 10 are slightly inclined downwardly in the direction of movement of the band. This inclination may for exarnple be at an angle of 6 to 10 tothe horizontal.
  • a suction chamber l5 communicates with the perforated conveyor belt 10 by way of a narrow chamber 16 formed by the opposed elements 14.
  • the chamber 15 further communicates with a pipe 17, ⁇ FIGURES l and 2, which extends to the inlet of a fan (not shown) arranged to draw air through the pipe l17 from the chambers 15 and 16 and thus through the perforated conveyor belt 10.
  • the passage S extends downwardly below the conveyor belt 6, and communicates with a pipe Z1 which extends to the output side of the fan referred to above, so that air is blown through the pipe 21 into and through the passage 8.
  • a pipe Z1 which extends to the output side of the fan referred to above, so that air is blown through the pipe 21 into and through the passage 8.
  • the air sucked through the conveyor 10 between the points marked -18 and 19 in the figure reaches the conveyor from the passage 3, While between the points marked 19 and 20 the air is drawn through the channel 9, whose opposed sides are extended downwardly by guide plates 22.
  • the arrangement of the fan, the pipe 17, and the suction chambers 15 and 16, is such that a negative pressure of about 800 to 900 mm. of water is maintained in the chamber 16.
  • a trimming device for trimming the tobacco liller is provided beneath the channel 9 at a position beyond the passage A8, that is, between the points marked 19 and 20 in FIGURE 2.
  • the trimming device comprises a pair of peripherally chamfered discs 23 mounted on two rotating spindles 24 driven by pinions 25.
  • the discs are arranged to be rotated in opposite directions as indicated in FIGURE 3, with a peripheral speed slightly greater than the linear speed of the conveyor -belt 10.
  • the two discs 23 have their bottom surfaces disposed in a single plane parallel to the plane of the flat conveyor belt 10. Although in the drawings the discs are shown apparently in contact, their opposed edges are,lat the 3 point where they are closest to each other, separated by a distance of 0.1 to 0.2 mm.
  • Beneath the trimming device is a paddle-wheel device 26 for removing tobacco which is separated from the filter by the discs 23.
  • This comprises a hub 27 provided with four radial ⁇ blades 28, each about 8 rnrn. wide.
  • the hub is mounted on the end of a spindle 29 which is arranged to rotate at high speed and is inclined to the direction of movement of the conveyor belt 1G.
  • the blades 28 are adjusted so that their extreme edges rub against the bottom Isurface of both the discs 23 at the region 4where the edges of the two discs approach closest to each other, and thus engage and remove tobacco which is -beneath the discs, completing the separation of that tobacco from the tobacco that passes above the discs.
  • An endless conveyor 30 extends beneath the rotating paddle-wheel 26 to receive tobacco removed and thrown downwardly by the blades 28.
  • the conveyor 30 is arranged to convey such tobacco towards, and deposit it upon, a further conveyor 31 (FIGURE l) which in turn deposits the tobacco on the conveyor band 2, which returns it to the hopper 1.
  • a frame 32 (FIGURES 5 and 6) supports bearings 33 for the spindles 24 of the discs 23, and also the bearing 34 for the shaft 29 of the paddle-wheel 26.
  • the frame 32 has a slide 36 which is slidable in a guideway 136 in a stationary frame 38.
  • a tapped member 37 is carried by the slide 36, and a screw 39 which extends through the frame 38 is threaded through the member 37 and can be rotated by a knob 40 in order to raise or lower the frame 32, and therefore the discs23 and the paddle-wheel 26.
  • the latter can move up and down with the frame 32 because its spindle 29 includes a universal joint 35.
  • the minimum distance of the edges of the discs 23 from the conveyor belt 10 is 9 mm., and this distance can if required be increased, by lowering the frame 32, by any suitable amount.
  • this distance can be increased from 9 mm. to 12 mm. with satisfactory results.
  • the minimum distance of 9 mm. is of course determined by the walls of the channel 9. If it is desired to position the discs 23 still closer to the conveyor 10, this can be done by making the channel less deep, or in other words by making the channel walls narrower.
  • an endless conveyor belt 41 is arranged to carry a continuous web 42 of cigarettepaper through rod-forming mechanism, including a tongue 43, ⁇ by which the tobacco ller is enclosed in the cigarettepaper web to form a continuous cigarette rod.
  • the belt 41 and cigarette-paper web 42 extend ⁇ beneath part of the conveyor ⁇ 10, and move at the same speed as the conveyor and in the same general direction, although in the construction shown, the belt 41 runs horizontally while the conveyor 10 is slightly inclined downwardly in its direction of movement.
  • the suction chamber 16 extends to the point marked 20, FIGURE 2, and beyond that point the conveyor 10 is no longer in communication with the source of suction.
  • the paper web 42 is led in beneath the conveyor 10 just before the latter reaches the point 20, and is thus in a position to receive and support the tobacco filler when this is no longer held by suction against the conveyor 10.
  • the spacing between the paper web 42 and the conveyor 10 is at no point greatly in excess of the depth of the tobacco ller, and is preferably approximately equal to the depth of the filler, so that the latter can be transferred from the conveyor to the paper without any substantial drop and thus with little disturbance.
  • a shoe 44 is arranged between the tongue 43 and the roller 11 and has an edge just clear of the conveyor 10 to prevent tobacco being carried around the roller 11 by the conveyor 10.
  • the belt 41 is supported in a trough 141 which shapes it and the paper web 42 into arcuate form in the usual way.
  • the operation of the apparatus is as follows.
  • Tobacco is fed from the hopper 1 by the carded roller 3, on which it forms a carpet or layer from which surplus tobacco is brushed back ⁇ by the brushing roller 4.
  • the picker roller 5, rotating at high speed picks tobacco from the carding of the roller 3 and throws it on to the conveyor 6, which as stated above is moving at a speed of 4 feet per second. This speed is high relative to the peripheral speed of the carded roller 3, and the tobacco is thus spread or distributed over the conveyor 6 fairly sparsely and in a somewhat separated condition.
  • the conveyor 6 Adjacent the point 7, FIGURE 1, the conveyor 6 passes over a guide roller and, due to the speed of the band 6, the tobacco is projected towards the passage ⁇ 8.
  • the distance from the point 7 (that is, the end of the conveying surface of the conveyor 6) to the passage 8 is, in the example illustrated, about 6 inches.
  • the passage 8 is so arranged and dimensioned in relation to the suction fan and the various air conduits that a stream of air flows upwardly through the passage 8 at a velocity of 30 feet per second.
  • the opposed walls of the passage 8 are spaced l0 mm. apart. This arrangement, whereby air flows at a speed of 30 feet per second through a 10 mm. passage, is found to give good results.
  • the tobacco is distributed over the conveyor 6 in a somewhat separated condition-that is to say, the individual shreds or particles of tobacco are to a considerable extent separated from one another by the picking operation and are distributed over the surface of the conveyor 6 in a similar condition owing to the high speed of the conveyor 6 relative to that of the carded roller 3.
  • substantially uniform density must not, however, rbe understood as meaning necessarily a density which is uniform throughout the depth of the filler.
  • the forces acting on the particles of tobacco at different depths or levels of the ller, as the latter is built up in the channel 9, may be Vaffected by the changing quantity of tobacco held against the perforated conveyor, in such a way as to produce a greater density of tobacco at one level than at another.
  • the ⁇ density at any one level is, however, thought to be substantially the same along the length of the ller (excluding any parts of the filler whose density may be deliberately increased by some means other than' the impact of tobacco under the iniiuence of the air stream).
  • the walls of the channel 9 are slippery, and consequently they oiier low resistance to the tobacco liller formed in the channel 9.
  • the eiect therefore, is that the filler is conveyed forward by the conveyor and subjected to the minimum of disturbance along its length.
  • Tobacco is fed to the passage 8 in suiiicient quantity, in relation to the speed of the conveyor 10, to enable a ller kto be built up on the conveyor of greater depth than is required in the iinal iiller.
  • the filler so formed may varry in ydepth from point to point along its length, but its minimum depth should, as far as is practicable, be at least equal to the distance between the conveyor 10 and the discs 23 of the trimming device which removes excess tobacco and thereby trims the lller to a uniform depth.
  • the filler after trimming being of substantially uniform density along its length (in the sense explained above) and now having a substantially uniform cross-sectional size, is capable of being compressed to cigarette-rod size while maintaining to a very great extent the uniformity of its density.
  • the amount of pressure exerted on the tobacco to compact it to at least half -the final density will of course vary with the kind and condition of the tobacco being used.
  • the trimmed lfiller is carried past the point 20, FIG- URE 2, beyond which it is no longer held to the conveyor 10 by suction. By this time, however, it has been led over the paper web 42 which is moving at the same speed as the filler ⁇ and is close enough to the conveyor 10 to receive the filler from the conveyor without the iller being subjected to any substantial drop or other disturbance. lThus the structure of the iiller which has been formed land trimmed on the conveyor lil is little disturbed during transfer to the paper web.
  • a method of producing a continuous trimmed tobacco rod comprising the steps of building up a continuous tobacco rod containing a surplus of tobacco over that in the trimmed rod, conveying the built up rod 'by means of a conveyor to a position at which the rod is trimmed by removal of said surplus tob-acco while conning the sides of the tobacco rod, at least adjacent the conveyor, and subjecting the tobacco rod, during a part at least of its passage to the said position', to air pressure 4directed against and through the tobacco rod and the conveyor in a direction transverse to the direction of movement of the tobacco rod to cause compression in said rod, at least part of said compression existing at said trimming position.

Landscapes

  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)
  • Manufacture Of Tobacco Products (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US139827A 1956-12-18 1961-09-19 Method of forming a continuous tobacco filler Expired - Lifetime US3088467A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
NL128335D NL128335C (ro) 1956-12-18
NL298514D NL298514A (ro) 1956-12-18
FR1179992D FR1179992A (fr) 1956-12-18 1956-12-18 Procédé pour réaliser un boudin de tabac de dimensions et de densité uniformes dans les machines à cigarettes ou autres
GB14133/60A GB854737A (en) 1956-12-18 1957-02-26 Improvements in or relating to apparatus for forming a continuous tobacco filler
GB26496/60A GB854738A (en) 1956-12-18 1957-02-26 Improvements in or relating to apparatus for forming a continuous tobacco filler
GB6407/57A GB854736A (en) 1956-12-18 1957-02-26 Improvements in or relating to apparatus for forming a continuous tobacco filler
CH351208D CH351208A (fr) 1956-12-18 1957-12-14 Procédé pour former un boudin de tabac continu sur une machine à fabriquer les cigarettes et appareil pour la mise en oeuvre de ce procédé
CH358023D CH358023A (fr) 1956-12-18 1957-12-14 Procédé pour former un flot de tabac continu sur une machine à fabriquer des produits à fumer et appareil pour la mise en oeuvre de ce procédé
US139827A US3088467A (en) 1956-12-18 1961-09-19 Method of forming a continuous tobacco filler
MY1964138A MY6400138A (en) 1956-12-18 1964-12-31 Improvements in or relating to apparatus for forming a continous tobacco filter
MY1964135A MY6400135A (en) 1956-12-18 1964-12-31 Improvements in or relating to apparatus for forming a continous tobacco filter
MY1966113A MY6600113A (en) 1956-12-18 1966-12-31 Improvements in or relating to apparatus for forming a continous tobacco filler

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1179992T 1956-12-18
US702104A US3030966A (en) 1956-12-18 1957-12-11 Filler forming mechanism
US139827A US3088467A (en) 1956-12-18 1961-09-19 Method of forming a continuous tobacco filler

Publications (1)

Publication Number Publication Date
US3088467A true US3088467A (en) 1963-05-07

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Application Number Title Priority Date Filing Date
US139827A Expired - Lifetime US3088467A (en) 1956-12-18 1961-09-19 Method of forming a continuous tobacco filler

Country Status (6)

Country Link
US (1) US3088467A (ro)
CH (2) CH358023A (ro)
FR (1) FR1179992A (ro)
GB (3) GB854736A (ro)
MY (3) MY6400135A (ro)
NL (2) NL298514A (ro)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403202A (en) * 1964-04-20 1968-09-24 Brown & Williamson Tobacco Method and apparatus for making tobacco-smoke filters
US3413979A (en) * 1959-02-02 1968-12-03 Hauni Werke Koerber & Co Kg Continuous cigarette rod-making machine
US3608562A (en) * 1968-02-07 1971-09-28 Hauni Werke Koerber & Co Kg Method and apparatus for producing a tobacco rod
US3712160A (en) * 1969-08-01 1973-01-23 Molins Machine Co Ltd Trimmers for cigarette making machines
DE2259814A1 (de) * 1971-12-09 1973-06-14 British American Tobacco Co Zigarettenherstellungsmaschine
US3955584A (en) * 1973-07-12 1976-05-11 Molins Limited Tobacco reclaiming apparatus in cigarette making
US4041959A (en) * 1975-10-08 1977-08-16 Amf Incorporated Braid forming method and apparatus
US4567902A (en) * 1983-08-11 1986-02-04 Philip Morris Incorporated Tobacco trimmer device
US5345950A (en) * 1990-07-25 1994-09-13 Lorillard Tobacco Company Apparatus for applying starch paste to tobacco articles
US20050113232A1 (en) * 2003-11-21 2005-05-26 Hauni Maschinenbau Ag Method of and apparatus for making a non-wrapped filter rod in the field of the tobacco processing industry

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL128335C (ro) * 1956-12-18
GB914822A (en) * 1958-01-21 1963-01-02 Molins Machine Co Ltd Improvements in or relating to tobacco manipulating machinery
GB914821A (en) * 1958-01-21 1963-01-02 Molins Machine Co Ltd Improvements in or relating to continuous rod cigarette making machinery
GB953862A (en) * 1959-04-17 1964-04-02 Desmond Walter Molins Improvements in or relating to continuous rod cigarette-making machines
US3094127A (en) * 1959-04-18 1963-06-18 American Mach & Foundry Cigarette making machine
US3096770A (en) * 1959-04-21 1963-07-09 American Mach & Foundry Cigarette making machine and method
GB958205A (en) * 1959-06-03 1964-05-21 Molins Machine Co Ltd Improvements in or relating to tobacco-manipulating machines
NL252242A (ro) * 1959-06-03
GB974972A (en) * 1960-02-09 1964-11-11 James Ernest Morris Improvements in or relating to tobacco-manipulating apparatus
US3750675A (en) * 1960-04-07 1973-08-07 Hauni Werke Koerber & Co Kg Method and apparatus for the production of tobacco rods
DE1170847B (de) * 1960-05-19 1964-05-21 Hauni Werke Koerber & Co Kg Verfahren und Vorrichtung zum Bilden eines Tabakfuellstromes
GB941414A (en) * 1960-06-21 1963-11-13 Molins Machine Co Ltd Improvements in or relating to tobacco-manipulating machines
GB1041552A (en) * 1961-09-07 1966-09-07 Desmond Walter Molins Improvements in or relating to machines for producing a continuous wrapped tobacco rod
IT1162318B (it) * 1979-05-22 1987-03-25 Gd Spa Procedimento e relativa macchina confezionatrice per la realizzazione contenporanea di due bachi continui di sigaretta
IT1188903B (it) * 1980-02-11 1988-01-28 Gd Spa Dispositivo rasatore di un cordone di tabacco in una macchina confezionatrice di sigarette

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1808795A (en) * 1928-07-05 1931-06-09 Firm Universelle Cigarettenmas Means for spreading cut tobacco
US2660178A (en) * 1948-02-17 1953-11-24 Usines Decoufle Sa Formation of the roll of tobacco in cigarette-making machines
FR1179992A (fr) * 1956-12-18 1959-05-29 Decoufle Usines Procédé pour réaliser un boudin de tabac de dimensions et de densité uniformes dans les machines à cigarettes ou autres

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1808795A (en) * 1928-07-05 1931-06-09 Firm Universelle Cigarettenmas Means for spreading cut tobacco
US2660178A (en) * 1948-02-17 1953-11-24 Usines Decoufle Sa Formation of the roll of tobacco in cigarette-making machines
FR1179992A (fr) * 1956-12-18 1959-05-29 Decoufle Usines Procédé pour réaliser un boudin de tabac de dimensions et de densité uniformes dans les machines à cigarettes ou autres
GB854736A (en) * 1956-12-18 1960-11-23 Decoufle Usines Improvements in or relating to apparatus for forming a continuous tobacco filler

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413979A (en) * 1959-02-02 1968-12-03 Hauni Werke Koerber & Co Kg Continuous cigarette rod-making machine
US3403202A (en) * 1964-04-20 1968-09-24 Brown & Williamson Tobacco Method and apparatus for making tobacco-smoke filters
US3608562A (en) * 1968-02-07 1971-09-28 Hauni Werke Koerber & Co Kg Method and apparatus for producing a tobacco rod
US3712160A (en) * 1969-08-01 1973-01-23 Molins Machine Co Ltd Trimmers for cigarette making machines
DE2259814A1 (de) * 1971-12-09 1973-06-14 British American Tobacco Co Zigarettenherstellungsmaschine
US3880171A (en) * 1971-12-09 1975-04-29 Brown & Williamson Tobacco Production of smoking articles
US3955584A (en) * 1973-07-12 1976-05-11 Molins Limited Tobacco reclaiming apparatus in cigarette making
US4041959A (en) * 1975-10-08 1977-08-16 Amf Incorporated Braid forming method and apparatus
US4567902A (en) * 1983-08-11 1986-02-04 Philip Morris Incorporated Tobacco trimmer device
US5345950A (en) * 1990-07-25 1994-09-13 Lorillard Tobacco Company Apparatus for applying starch paste to tobacco articles
US20050113232A1 (en) * 2003-11-21 2005-05-26 Hauni Maschinenbau Ag Method of and apparatus for making a non-wrapped filter rod in the field of the tobacco processing industry

Also Published As

Publication number Publication date
CH358023A (fr) 1961-10-31
NL298514A (ro)
MY6600113A (en) 1966-12-31
MY6400138A (en) 1964-12-31
GB854737A (en) 1960-11-23
GB854736A (en) 1960-11-23
FR1179992A (fr) 1959-05-29
GB854738A (en) 1960-11-23
MY6400135A (en) 1964-12-31
NL128335C (ro)
CH351208A (fr) 1960-12-31

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