EP0454075B1 - Procédé de fabrication de filtres de cigarettes - Google Patents

Procédé de fabrication de filtres de cigarettes Download PDF

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Publication number
EP0454075B1
EP0454075B1 EP91106566A EP91106566A EP0454075B1 EP 0454075 B1 EP0454075 B1 EP 0454075B1 EP 91106566 A EP91106566 A EP 91106566A EP 91106566 A EP91106566 A EP 91106566A EP 0454075 B1 EP0454075 B1 EP 0454075B1
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EP
European Patent Office
Prior art keywords
filter
cigarette filter
butyric acid
fibres
cigarette
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
EP91106566A
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German (de)
English (en)
Other versions
EP0454075A3 (en
EP0454075A2 (fr
Inventor
Wolfgang Dr. Dipl.-Physiker Wiethaup
Knut Dipl.-Ing. Möller
Bernhard Dr. Dipl.-Chem. Hauser
Erhard Dr. Dipl.-Ing. Rittershaus
Timothy Dr. Hammond
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.)
British-American Tobacco (germany) zeneca Lim GmbH
Original Assignee
BAT Cigarettenfabriken GmbH
Zeneca Ltd
Imperial Chemical Industries Ltd
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 BAT Cigarettenfabriken GmbH, Zeneca Ltd, Imperial Chemical Industries Ltd filed Critical BAT Cigarettenfabriken GmbH
Publication of EP0454075A2 publication Critical patent/EP0454075A2/fr
Publication of EP0454075A3 publication Critical patent/EP0454075A3/de
Application granted granted Critical
Publication of EP0454075B1 publication Critical patent/EP0454075B1/fr
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
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters

Definitions

  • the invention relates to a method for producing cigarette filters according to the preamble of claim 1, a filter produced in this way according to the preamble of claim 8 and a special use of PHB according to claim 13.
  • the fiber material is produced by a nozzle spinning process with a large number of spinnerets. After spinning, the individual continuous fibers are combined in a number of several thousand to form a fiber bundle and crimped in a crimping device. The bundle is then deposited as a curled band and pressed together, for example in block form.
  • the crimped tape is pulled off the block and first opened by a stretching arrangement, which causes the individual fibers to be shifted in their position relative to one another, so that a 3-dimensional strand, which is as voluminous as possible, forms in a format device the desired diameter is compressed, wrapped with paper and processed into cylindrical filter rods.
  • a fiber material is already known from EP 0 177 207 A2, the individual fibers of which are produced from PHB (polyhydroxybutyric acid) or copolymers PHB / PHV (polyhydroxyvaleric acid).
  • This fiber material is produced microbiologically and is suitable for spinning out of a centrifugal spinning device.
  • the fibers produced form cloths which can be suitably pressed or shaped for the intended purpose.
  • the special property of the fiber materials namely their biodegradability, is particularly important since the products produced with these fibers, for example wound sutures, are broken down in the body itself, so that a later removal of the materials from the body is not necessary.
  • This material is a polyester with 4 - 5 carbon atoms per basic building block.
  • a microorganism is usually cultivated in an aqueous medium on a suitable substrate, such as, for example, carbohydrates or methanol, which provides energy and carbon.
  • the substrate must be assimilable by the microorganism.
  • at least part of the cultivation is carried out with limitation of the nutrient that is used for Growth of the microorganism is required, but this is not necessary for polymer accumulation. Examples of suitable processes are described in EP PS 15 669 and 46 344.
  • Copolymers can also be produced which contain other hydroxycarboxylic acids e.g. Hydroxyvaleric acid and / or units derived from a diol, e.g. Contain ethylene glycol and / or dicarboxylic acids, e.g. Isophthalic acid.
  • An ester exchange takes place when the microbiologically produced polymer or copolymer with a hydroxycarboxylic acid, or its lactone, e.g. Pivalolactone, a diol, a dicarboxylic acid and / or a polyester produced therefrom.
  • HB polymers used below means not only 3-hydroxybutyric acid homopolymers, but also copolymers, as described, provided the 3-hydroxybutyric acid units form at least part of the polymer chain.
  • the invention is based on the object of specifying a method for producing cigarette filters and cigarette filters which can be decomposed relatively quickly under the influence of environmental influences, but nevertheless have good filter properties.
  • the filter material according to the invention has the special property that it converts to completely harmless products, such as carbon dioxide and water, within short periods of time, in particular in months.
  • the disposal that was previously necessary in the case of cigarette filters, such as incineration or dumping, is only required to a limited extent since the material according to the invention decomposes itself under the influence of microorganisms.
  • the material new for the use according to the invention has improved filter properties compared to conventional cellulose acetate filters, since the taste properties are improved in particular in the case of filter-ventilated cigarettes or an increased dilution of the cigarette smoke is possible with the same taste intensity.
  • the filter material 19 consists of tangled layers of a fiber material, the individual fibers of which are generally longer than the filter section.
  • the individual fibers of the material are generally at an angle of 30-40 ° to the longitudinal axis of the filter 17, the fibers being oriented overall in the axial direction of the filter.
  • the filter materials are produced by spinning the polymer into fibers.
  • the centrifuge spinning process described in EP 0 177 207 can in principle be used for the purposes of the invention, but the process parameters differ.
  • the use of centrifuge spinning technology has led to the surprising finding that direct filter rod production is possible in this way.
  • the centrifugal spinning process enables the immediate production of a 3-dimensional strand with an approximately round cross-sectional shape, which can be brought into the desired shape and size of a filter rod by radial compression.
  • Fig. 2 shows a device for producing a fiber strand according to the invention.
  • a spinning solution with a 10-20% weight concentration per volume of solution (W / V) consists of PHB or copolymer PHB-PHV with a molecular weight of greater than 300,000 in a solvent such as chloroform or methylene chloride.
  • the solution is itself in a solution container 14.
  • the solution is fed to the spinning head via a pump 15.
  • This preferably contains a hollow shaft 1, which leads to a spinning cup 2, on which the cup bead 4 is axially continued.
  • the spinning solution is pressed under pressure onto the top of the cup bead 4.
  • the spinning head rotates at a speed of 8,000 rpm, for example. As a result of this rotation, the spinning solution flies to the outside of the bead and is divided into individual filaments.
  • a first air chamber 5 is provided around the hollow shaft and cold air is supplied via an air inlet 6.
  • the cold air supplied blows onto the spinning head in the axial direction and combs and separates the fibers as they emerge from the spinning cup 2.
  • the speed of the cold air counteracts the rotation or the twist which the fibers have been impressed by the spinning cup 2.
  • a change in the cold air speed affects the degree of crosslinking in the fiber stream.
  • a further air chamber 7 is provided which is concentric with the air chamber 5 and to which hot air is supplied via the air inlet 8.
  • the warm air blown out of the chamber 7 in the axial direction of the device downward from the air outlet 9 evaporates the solvent of the spinning solution and forms the network-like connected polymer fibers.
  • the spinning head rotates at around 4,000 - 15,000 rpm, in particular 8,000 - 12,000 rpm.
  • the spinning head diameter is typically 10-15 cm.
  • the warm air temperature at the entrance to the air chamber 7 is approximately 160-200 ° C.
  • the individual filaments are deflected downwards by the air currents blowing in the axial direction and can form a strand there be summarized.
  • an extractor operating with an air stream is provided, which detects the fiber bundle and extracts it to the outside.
  • the excess air and solvent vapor are discharged to the outside through an opening 11 and a vent 12.
  • the shape of the spun material can be influenced by varying the flows of cold air to warm air under otherwise identical conditions. If the volume ratio cold: warm is greater than 2: 1, an open fleece is obtained. If it is less than 0.1: 1, a compact, twisted thread is obtained. A fiber bundle or a fiber strand can be produced in the intermediate region. It has been found that a ratio of 0.5: 1 to 0.2: 1 is the most favorable strand formation ratio for further shaping and processing into cigarette filter rods.
  • FIG. 4 shows an electron micrograph of a cloth produced with a volume ratio of 2: 1 cold air to warm air
  • FIG. 5 shows a corresponding image of a thread in which the volume ratio was 0.1: 1
  • FIG. 6 shows an image of a Stranges, which was produced with a volume ratio of 0.33: 1 and which can be used for the purposes of the invention.
  • the temperature at the exit of the evaporation section should be in the range 60 - 100 ° C.
  • the absolute amounts of air depend on the mass flow of the spinning liquid, whereby amounts of heat per gram of fibers in the above-mentioned. Solvents for PHB in the range of 4,000 - 8,000 J are required.
  • the air discharge summarizing the downward blown fiber bundle at the end of the evaporation path through an annular nozzle 16 exerts a minimal pulling force on the fiber bundle and still brings the bundle together well. Too large a pull-off force would rather cause an excessive axial fiber orientation, which negatively affects the filter properties.
  • the ring nozzle used with a diameter of 50 mm, an air flow of 0.012 - 0.016 m3 / s and an air pressure of 0.21 - 0.28 bar acts practically as a fixed point for the twisting of the fibers, which results from the rotation of the spinning head.
  • the strand diameter is set to approximately 30-50 mm.
  • a container 10 Arranged around the spinning core and the surrounding air chambers is a container 10 which extends far downward and has the opening 11 at the lower end, at the end of which an outlet 12 is provided, to which a suction device can be connected.
  • the polymers produced according to the invention have thermoplastic properties. Many properties correspond to those of polyolefins. In contrast to conventional plastics, PHB and also the copolymers are characterized by the fact that they are biodegradable.
  • a hot spinning solution can also be used in order to avoid gelation of the HB polymer at high concentration.
  • a spinning solution with 10-15% concentration (weight per volume) PHB in chloroform or methylene chloride is suitable.
  • a spinner head with a diameter of 10 cm and a rotation speed of 10,000 rpm was used.
  • the solution concentration was 13% weight PHB per unit volume Solution dissolved in chloroform.
  • the molecular weight was about 600,000.
  • Hot air of 190 ° C. was used, the volume ratio between cold and warm air being 1: 1 - 0.3: 1. 6.4 g per second of polymer material was spun out.
  • the solution temperature was 20 ° C.
  • Spun threads with a diameter of 2-20 micrometers (with the majority of the fibers being 5-7 micrometers in diameter) were produced, which were drawn off at a speed of 10 m per minute.
  • the strand density was approximately 500 mg per decimeter run length.
  • the surface of the device should have the air vent at least 1.2 m below the spinning head.
  • Fig. 3 shows the device in connection with a format device.
  • the fiber strand 20 emerging from the air outlet 16 is transferred via a deflection 23 directly into the inlet 24 of the format device. This is where the strand is radially compressed to the desired diameter and wrapped with filter wrapping paper 25 which is fed to the strand 20 via a format belt 27.
  • the filter strand produced can be cut to length in a cutting device 26, so that the finished filter rods 22 then result.
  • a finished filter has a pressure drop (tensile resistance at a standard flow of 17.5 cm3 / s) of about 20 - 50 mm water column per cm.
  • the weight of the filter is 30 - 80 mg per cm for common diameters of 7.84 mm.
  • the filter properties differ from those of conventional cellulose acetate filters. This difference is due to the different chemical structure of the polymer surfaces of cellulose acetate and PHB. This leads to changed adhesion properties of the particles to be filtered, so that the amount of the non-filtered out volatile components of the cigarette smoke differs from conventional cigarettes. This can be seen in particular from the headspace analysis on the gas chromatograph which is customary in the cigarette industry.
  • Filters made from PHB fiber material were compared to standard filters made from cellulose acetate. The focus of the investigations was to find out how the influence of filter ventilation in both systems can be compared in terms of sensors and smoke analysis.
  • CA filters cellulose acetate filters
  • PHB filters polyhydroxybutyric acid
  • the two series were laser-perforated. By setting the laser power and the pulse frequency, the following degrees of ventilation achieved: 24% 51% 73%
  • the unventilated version served as a zero test.
  • FIG. 7 shows a comparison of the nicotine-free, dry smoke condensate (PMWNF), nicotine and CO for PHB as a function of the degree of ventilation, in relative units based on the CA filter.
  • PMWNF dry smoke condensate
  • Fig. 9 the chromatograms have been divided into three areas.
  • the PHB filter retains disproportionately more condensate, and nicotine gets disproportionately more into the smoke compared to CA (Fig. 7). Since CO remains comparable in all cases, this is not a dilution effect, but stems from the material properties.
  • the main shift is in the central area of the chromatograms, where the medium-volatile, flavor-intensive substances are detected. If these areas are related to the condensate (TPM) and the PHB values are normalized to the CA values, the course shown in FIG. 10 is included.
  • TPM condensate
  • the proportion of medium-volatile substances is significantly higher than the comparatively large proportion of volatile and low-volatility substances.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Glass Compositions (AREA)

Claims (14)

  1. Procédé pour la fabrication de filtres de cigarettes par compression transversale et enveloppement d'un boudin formé d'un matériau à fibres à structure sensiblement axiale, dans le dispositif de mise en forme d'une machine à filtres de cigarettes, caractérisé en ce qu'on déverse du PHB (poly(acide hydroxybutyrique)) ou un copolymère de PHB/PHV (poly(acide hydroxyvalérique)) dans un dispositif de filage centrifuge, et on réunit les fibres individuelles obtenues, reliées suivant une structure réticulée, en un boudin de fibres qui est amené vers le dispositif de mise en forme de la machine à filtres de cigarettes.
  2. Procédé selon la revendication 1, caractérisé en ce qu'une solution de PHB ou une solution de copolymère de PHB/PHV est projetée sur une tête de filage en rotation, en ce qu'un courant d'air froid concentrique amené coaxialement par rapport à la tête de filage à température ambiante détache et sépare les fibres sortant du pot de filage afin d'agir à l'encontre de la torsion des fibres, en ce qu'un courant d'air chaud disposé de façon concentrique autour du courant d'air froid évapore le solvant utilisé, et en ce que les fibres de polymère formées sont réunies en un boudin de fibres.
  3. Procédé selon la revendication 2, caractérisé en ce que la tête de filage tourne à une vitesse de 4000 à 15000 tr/min pour un diamètre de tête de filage de 10 à 15 cm, et en ce que la température du courant d'air chaud est de 160 à 200°C.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce qu'il se forme, grâce au réglage du rapport de la quantité d'air du courant froid à celle du courant chaud, une forme de boudin qui présente, après compression radiale, un diamètre régulier.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que le rapport de la quantité d'air du courant froid à celle du courant chaud est de 0,5:1 à 0,2:1.
  6. Procédé selon la revendication 4, caractérisé en ce que la compression radiale se fait grâce à une tuyère annulaire dont la force de traction longitudinale tend vers zéro, et en ce que le diamètre du boudin de fibres quittant la tuyère est de 30 à 50 mm.
  7. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que le boudin de fibres sortant du dispositif de filage est introduit directement dans le dispositif de mise en forme de la machine à filtres de cigarettes.
  8. Filtre de cigarette fabriqué à l'aide d'un procédé selon la revendication 1, composé d'une section de boudin de libres (20) comprimé transversalement et formé de fibres individuelles, orientées de façon aléatoire, de PHB (poly(acide hydroxybutyrique)) filé ou d'un copolymère de PHB et de PHV (poly(acide hydroxyvalérique)).
  9. Filtre de cigarette selon la revendication 8, caractérisé en ce que le diamètre des libres individuelles est de 2 à 20 microns.
  10. Filtre de cigarette selon la revendication 8 ou 9, caractérisé en ce que les fibres individuelles se trouvent de préférence dans une position transversale principale de 30 à 45° par rapport à l'axe longitudinal du filtre.
  11. Filtre de cigarette selon l'une des revendications 8 à 10, caractérisé en ce que les fibres individuelles présentent en règle générale une longueur supérieure à celle du filtre de cigarette.
  12. Filtre de cigarette selon l'une des revendications 8 à 11, caractérisé en ce que le filtre présente un degré de ventilation supérieur à 40 %.
  13. Utilisation de PHB (poly(acide hydroxybutyrique)) filé ou d'un copolymère de PHB et de PHV (poly(acide hydroxyvalérique)) pour des filtres de cigarettes.
  14. Utilisation selon la revendication 13, caractérisé en ce que les fibres individuelles orientées de façon aléatoire pendant la fabrication sont comprimées transversalement en un boudin de fibres et réparties dans des sections enveloppées de filtres de cigarettes.
EP91106566A 1990-04-26 1991-04-24 Procédé de fabrication de filtres de cigarettes Expired - Lifetime EP0454075B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013304A DE4013304C2 (de) 1990-04-26 1990-04-26 Verfahren zur Herstellung von Cigarettenfiltern sowie Cigarettenfilter
DE4013304 1990-04-26

Publications (3)

Publication Number Publication Date
EP0454075A2 EP0454075A2 (fr) 1991-10-30
EP0454075A3 EP0454075A3 (en) 1992-04-22
EP0454075B1 true EP0454075B1 (fr) 1994-10-26

Family

ID=6405130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106566A Expired - Lifetime EP0454075B1 (fr) 1990-04-26 1991-04-24 Procédé de fabrication de filtres de cigarettes

Country Status (5)

Country Link
EP (1) EP0454075B1 (fr)
AT (1) ATE113174T1 (fr)
DE (2) DE4013304C2 (fr)
DK (1) DK0454075T3 (fr)
ES (1) ES2066256T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322966C2 (de) 1993-07-09 1995-10-26 Rhodia Ag Rhone Poulenc Aus Celluloseacetat geformte Gebilde und ihre Verwendung als Filtertow und Tabakrauchfilterelement
DE19536505A1 (de) * 1995-09-29 1997-04-10 Biotec Biolog Naturverpack Biologisch abbaubares Filtermaterial und Verfahren zu seiner Herstellung
DE10354924B4 (de) * 2003-11-25 2024-01-18 Körber Technologies Gmbh Vorrichtung zum Aufbereiten von Filtertowmaterial sowie Vorrichtung zur Herstellung von Filtern
CN100406632C (zh) * 2006-01-18 2008-07-30 东华大学 一种纳米级直径的生物可降解纤维无纺布和制备方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL186392B (nl) * 1953-06-30 Herberts & Co Gmbh Carboxylgroepen bevattende polyesters, werkwijze voor de bereiding daarvan en deze esters bevattende waterige bekledingsmiddelen.
DE1039904B (de) * 1957-07-23 1958-09-25 Zigarettenfabrik Kosmos G M B Filterkoerper, insbesondere zum Entgiften von Tabakrauch, und Verfahren zu deren Herstellung
DE1275428B (de) * 1960-06-17 1968-08-14 Eastman Kodak Co Verfahren zur Herstellung von Tabakrauchfilterelementen
GB941082A (en) * 1961-05-11 1963-11-06 Cigarette Components Ltd Improvements in or relating to cigarette filters
GB8424950D0 (en) * 1984-10-03 1984-11-07 Ici Plc Non-woven fibrous materials

Also Published As

Publication number Publication date
ES2066256T3 (es) 1995-03-01
DE4013304C2 (de) 1993-11-25
DE4013304A1 (de) 1991-10-31
EP0454075A3 (en) 1992-04-22
DE59103314D1 (de) 1994-12-01
ATE113174T1 (de) 1994-11-15
EP0454075A2 (fr) 1991-10-30
DK0454075T3 (da) 1995-04-03

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