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WO1991000697A1 - Systeme pneumatique de derivation de petites lamelles - Google Patents

Systeme pneumatique de derivation de petites lamelles Download PDF

Info

Publication number
WO1991000697A1
WO1991000697A1 PCT/GB1990/001065 GB9001065W WO9100697A1 WO 1991000697 A1 WO1991000697 A1 WO 1991000697A1 GB 9001065 W GB9001065 W GB 9001065W WO 9100697 A1 WO9100697 A1 WO 9100697A1
Authority
WO
WIPO (PCT)
Prior art keywords
separator
air
screen
cutter
conveying
Prior art date
Application number
PCT/GB1990/001065
Other languages
English (en)
Inventor
Victor Albert Montgomery White
Original Assignee
Gbe International Plc
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 Gbe International Plc filed Critical Gbe International Plc
Publication of WO1991000697A1 publication Critical patent/WO1991000697A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B5/00—Stripping tobacco; Treatment of stems or ribs
    • A24B5/10—Stripping tobacco; Treatment of stems or ribs by crushing the leaves with subsequent separating
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B7/00—Cutting tobacco
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/06—Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves

Definitions

  • This invention relates to a pneumatic separator and feed system for the preparation of tobacco for cigarette production.
  • the midrib (knov/n as stem) is first separated from the lamina by a threshing process and the two components then processed separately.
  • the lamina is the major component comprising typically 80% of the leaf by weight.
  • the principle step in the processing of the lamina is to cut it into strands of typically 0.8 mm width and of varying length.
  • the stems are also cut into slivers typically 0.15 mm thick to match the thickness of the lamina.
  • a tangle of these shreds forms the cigarette filling.
  • the specific volume of the shreds and their beam strength determines the firmness of the cigarette.
  • Very short strands less than 3-5 mm in length do not contribute to the firmness, but rather detract from it.
  • the threshing process for separating the lamina from the stem is a crude process, which severely reduces the size of the lamina particles and the length of the stems.
  • a typical sieve analysis of the lamina is:
  • pan fraction and some of the over 1/8 inch mesh fraction when cut will produce strands which are less than 3-5 mm long and which do not contribute to the cigarette firmness.
  • a disadvantage of using a vibrating sieve is that the screen readily blocks and requires frequent cleaning. Also, because the screen must be rigidly mounted to sustain the vibration, the mesh size cannot easily be changed to suit varying blend requirements.
  • An object of the invention is to ⁇ rovide a pneumatic separator and feed system for the preparation of shredded tobacco for supply to a cigarette, maker, in which the number of small cut lamina particles, which do not contribute to the firmness of the cigarette, is reduced.
  • a further object of this invention to provide a small lamina cutter bypass in which a separator screen remains clear for long periods, but can also be rapidly changed for cleaning or changing mesh size.
  • Another object is to provide a small lamina cutter bypass, which is combined with an air separator for removing heavy foreign particles before the cutter, to protect the cutting knives from damage.
  • a pneumatic separator and feed system for the preparation of tobacco for cigarette production, comprising a first separator for separating the material into large and small fractions, a second separator for receiving the small fraction separated by the first separator for separating the small fraction from the air and dust, a first transport means for conveying the large fraction from the second separator to a cutter, and a second transport means for conveying the small fraction, separated from the air and dust, direct to the main bulk of cut tobacco after leaving the cutter thereby bypassing the cutter.
  • V7 ' a a bypass duct to join the main flow of tobacco after said main flow has left the cutter.
  • a pneumatic separator 10 or "air leg” is a vertical rectangular air duct, with a conveyer 11 feeding the whole lamina flow into an inlet 10b in the long side of the duct.
  • the air flow is drawn into the inlet 10c of the duct, and upward, typically 6 m/s, so that lamina is lifted and conveyed, whilst heavy foreign particles such as stones, metal or wood are not lifted and drop into a collection box 12.
  • a first separator 13, connected to the outlet of the air leg 10, is of the oblique scoured screen type, which uses a screen 14 to separate the heavy fraction of tobacco from the air, which fraction passes through an air lock 15 to a conveyor 16 feeding the main flow to a cutter (not shown).
  • This type is characterised by having a larger component of the air velocity parallel with the screen, which scours the surface and prevents it blinding.
  • the separator 13 is in the form of a chamber having a generally triangular vertical section and is defined by front and back walls which are parallel to each other and side walls 13a, 13b, inclined to each other at angle of from between 65-85° and arranged symmetrically about the vertical.
  • the side walls 13a, 13b which are set at right angles to the front and back walls, converge from the top, in the manner of a chute, down to an outlet which is matched in size to the inlet of the airlock 15.
  • the screen 14 effectively enclosed the top side of the chamber and is set at an angle of from 10 to 15° to the longitudinal axis of the inlet duct 10a.
  • a restricting baffle 13d In order to accelerate the air flow as it passes from the duct to the inlet 13c of the chamber there is provided a restricting baffle 13d.
  • the generally triangular shape of the chamber and the position of the air entry encourages air circulation, which enhances a scouring action upon the screen surface.
  • This separator may be fitted with a fine mash screen to separate as much tobacco as possible from the air. However, by fitting a coarser mesh screen, the small lamina particles will be carried through the screen with the air to a second separator 17; whilst the larger lamina parf cles, comprising the bulk of the material will be discharged via the air lock 15.
  • the screen 14 can be wire mesh or perforated sheet (including rasp shape or cheese-grater perforations), and the mesh or perforation size determines the size of particle which can be passed through. This can readily be changed to match blend requirements.
  • the second separator 17 is preferably of the tangential type which depends upon centrifugal action to separate the tobacco from the air. It does not necessarily require a screen and will separate all but the finest dust, which is carried over by the air to a dust filter 20.
  • the small lamina separated by the previous stage is discharged from the tangential separator 17 via an air lock 18 on to the cutter bypass conveyor 19.
  • the second separator may instead be of the screen type in which the screen is finer than the screen of the first separator.
  • a cyclone fitted with an air lock, can be used instead of the tangential separator.
  • the air from the second separator is passed through the filter 20 to collect the dust and a main fan 21 which provides the air flow for the separator system.

Landscapes

  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)

Abstract

Un séparateur pneumatique et un système d'alimentation pour préparer le tabac destiné à la production des cigarettes, comprenant un premier séparateur (13) pour séparer le tabac en grosses et en petites fractions, un deuxième séparateur (17) pour recevoir la petite fraction séparée par le premier séparateur et séparer la petite fraction de l'air et de la poussière, un premier moyen de transport (16) pour acheminer la grosse fraction depuis le premier séparateur vers le couteau et un deuxième moyen de transport (19) pour acheminer la petite fraction, séparée de l'air et de la poussière, directement vers le plus grand volume de tabac coupé à la sortie des couteaux. De cette manière, ladite petite fraction ne passe pas par l'ensemble de couteaux.
PCT/GB1990/001065 1989-07-11 1990-07-11 Systeme pneumatique de derivation de petites lamelles WO1991000697A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8915823.2 1989-07-11
GB898915823A GB8915823D0 (en) 1989-07-11 1989-07-11 Pneumatic small limina bypass

Publications (1)

Publication Number Publication Date
WO1991000697A1 true WO1991000697A1 (fr) 1991-01-24

Family

ID=10659840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/001065 WO1991000697A1 (fr) 1989-07-11 1990-07-11 Systeme pneumatique de derivation de petites lamelles

Country Status (2)

Country Link
GB (1) GB8915823D0 (fr)
WO (1) WO1991000697A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101708066B (zh) * 2009-12-11 2012-05-09 广东中烟工业有限责任公司 一种烟丝切丝机除尘系统
WO2013057379A1 (fr) * 2011-10-19 2013-04-25 Baudelaire Elie Procede ptc pour l'extraction par voie seche des principes actifs naturels
CN103519346A (zh) * 2013-10-22 2014-01-22 广东中烟工业有限责任公司 一种多级分离式梗签剔除物中烟丝回收装置
WO2014135130A1 (fr) * 2013-03-07 2014-09-12 红塔烟草(集团)有限责任公司 Séparateur pneumatique de type à pression d'air à double bac
CN105396782A (zh) * 2015-11-04 2016-03-16 智思控股集团有限公司 高效烟丝风选方法及设备
CN105876844A (zh) * 2016-04-11 2016-08-24 红云红河烟草(集团)有限责任公司 一种叶片分选风分器往复式组合技术

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1338893U (fr) *
US3010576A (en) * 1957-12-24 1961-11-28 Hauni Werke Koerber & Co Kg Apparatus for separating or winnowing tobacco and other like fibrous material
DE1138351B (de) * 1959-04-06 1962-10-18 Martin Brinkmann Kommanditgese Vorrichtung zum Sichten von Schnitt-Tabak
DE2921025A1 (de) * 1978-05-23 1979-11-29 Rothmans Of Pall Mall Verfahren zum verarbeiten von tabakblaettern zu zigarettentabak
GB1568629A (en) * 1976-04-23 1980-06-04 Brown & Williamson Tobacco Corp Smokable tobacco products and methods and apparatus for the production thereof
US4323083A (en) * 1979-06-11 1982-04-06 Brown & Williamson Tobacco Corporation Method for separating veins from lamina of tobacco leaf
EP0118981A2 (fr) * 1983-02-08 1984-09-19 Amf Incorporated Procédé pour la production d'une matière à fumer à partir de déchets grossiers d'une machine à fabriquer les cigarettes et appareil y relatif
EP0293218A1 (fr) * 1987-05-28 1988-11-30 British-American Tobacco Company Limited Expansion du tabac

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1338893U (fr) *
US3010576A (en) * 1957-12-24 1961-11-28 Hauni Werke Koerber & Co Kg Apparatus for separating or winnowing tobacco and other like fibrous material
DE1138351B (de) * 1959-04-06 1962-10-18 Martin Brinkmann Kommanditgese Vorrichtung zum Sichten von Schnitt-Tabak
GB1568629A (en) * 1976-04-23 1980-06-04 Brown & Williamson Tobacco Corp Smokable tobacco products and methods and apparatus for the production thereof
DE2921025A1 (de) * 1978-05-23 1979-11-29 Rothmans Of Pall Mall Verfahren zum verarbeiten von tabakblaettern zu zigarettentabak
US4323083A (en) * 1979-06-11 1982-04-06 Brown & Williamson Tobacco Corporation Method for separating veins from lamina of tobacco leaf
EP0118981A2 (fr) * 1983-02-08 1984-09-19 Amf Incorporated Procédé pour la production d'une matière à fumer à partir de déchets grossiers d'une machine à fabriquer les cigarettes et appareil y relatif
EP0293218A1 (fr) * 1987-05-28 1988-11-30 British-American Tobacco Company Limited Expansion du tabac

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101708066B (zh) * 2009-12-11 2012-05-09 广东中烟工业有限责任公司 一种烟丝切丝机除尘系统
WO2013057379A1 (fr) * 2011-10-19 2013-04-25 Baudelaire Elie Procede ptc pour l'extraction par voie seche des principes actifs naturels
WO2014135130A1 (fr) * 2013-03-07 2014-09-12 红塔烟草(集团)有限责任公司 Séparateur pneumatique de type à pression d'air à double bac
US9764362B2 (en) 2013-03-07 2017-09-19 Hongta Tobacco (Group) Co., Ltd. Air-pressure-type dual-bin air-powered separator
CN103519346A (zh) * 2013-10-22 2014-01-22 广东中烟工业有限责任公司 一种多级分离式梗签剔除物中烟丝回收装置
CN105396782A (zh) * 2015-11-04 2016-03-16 智思控股集团有限公司 高效烟丝风选方法及设备
CN105876844A (zh) * 2016-04-11 2016-08-24 红云红河烟草(集团)有限责任公司 一种叶片分选风分器往复式组合技术

Also Published As

Publication number Publication date
GB8915823D0 (en) 1989-08-31

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