EP0715816A2 - Procédé et dispositif pour la formation d'une tige de filtre dans l'industrie du tabac - Google Patents
Procédé et dispositif pour la formation d'une tige de filtre dans l'industrie du tabac Download PDFInfo
- Publication number
- EP0715816A2 EP0715816A2 EP95118616A EP95118616A EP0715816A2 EP 0715816 A2 EP0715816 A2 EP 0715816A2 EP 95118616 A EP95118616 A EP 95118616A EP 95118616 A EP95118616 A EP 95118616A EP 0715816 A2 EP0715816 A2 EP 0715816A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter tow
- strand
- filter
- plane
- movement path
- 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.)
- Withdrawn
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Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
Definitions
- the invention relates to a method for forming a filter tow for the production of filters for cigarettes or other smokable articles in the tobacco processing industry, in which a filter tow strip is spread out and processed, the prepared filter tow strip is gathered together into a filter tow strand and this is further processed to a filter strand, wherein the filter tow strand is moved at least in sections in a movement path plane.
- It also relates to a device for forming a filter tow for the production of filters for cigarettes or other smokable articles in the tobacco processing industry, with a device for spreading and preparing a moving filter tow strip, a gathering device for gathering the spread and processed filter tow strip into a filter tow string and with one Filter tow strand at least in sections in a plane of movement path to a strand guiding device leading to a further processing machine.
- Such a machine is known for example from US Pat. No. 4,511,420 or US Pat. No. 5,060,664.
- These known machines pull a filter tow strip (for example from cellulose acetate threads) from a bale in a conventional manner and give it processed by stretching and treating with plasticizer and gathered it into a filter tow strand in a desired shape and consistency for further processing to a filter strand unit, which consists of the filter tow strand produces a filter strand by covering it with a wrapping material strip, which is finally cut into filter sticks for cigarettes or other such tobacco products.
- the filter tow strip is gathered together and thus a filter tow strand is formed directly in the inlet funnel the processing machine.
- Proven processing devices of the type described above are manufactured and sold by the applicant under the designations AF1, AF2 and AF3.
- Proven filter rod machines from the applicant are known under the names KDF2 and KDF3.
- the invention has for its object to provide a further advantageous method and a further advantageous device of the type mentioned for the processing of filter tow.
- a plane of movement path is to be understood as an imaginary plane in which an arbitrarily assumed point of the filter tow strand moves in particular when the strand is deflected around a deflection roller or the like. In conventional filter tow processing machines, this plane of movement is essentially vertical.
- the procedure according to the invention avoids the occurrence of "split" in the filter tow strand, which can impair the quality of the filter rods produced from the filter tow strand and is therefore undesirable.
- “Towsplit” are understood to be parts of the filter tow strand which separate from the crosslinking in the strand formed by the preparation and gathering of the filter tow strip consisting of threads and thus separate from one another.
- the effect of the measures proposed according to the invention preventing the formation of towsplit is improved in a further continuation of the invention in that the filter tow strand is deflected at least twice in opposite directions transverse to the plane of the movement path before it is passed on for further processing.
- the filter tow strand is guided back into the first movement path plane after it has been deflected. In this way, the further movement of the filter tow strand takes place in the plane of the movement path, which is predetermined by the movement of the filter tow through the units of the machine preceding the deflection.
- a continuation of the method proposed according to the invention is particularly advantageous, which consists in that the cross-section of the filter tow strand is reduced at least in the case of a deflection. If several deflections are provided, the cross section of the filter tow strand is further reduced in each case in the case of successive deflections transverse to the plane of the movement path. In this way, the cross section of the filter tow strand can already be largely adapted to the cross section of the filter strand to be produced before it enters the inlet funnel of the filter strand machine. The multiple deflections in the lateral direction further reduce the unwanted tow split.
- the object on which the invention is based is achieved in that at least one further guide device which deflects the filter tow line transversely to the plane of the movement path is provided. Further developments and refinements of the device according to the invention are contained in subclaims 8 to 13. Claims 8 and 9 indicate means for improving the effect of the device according to the invention which reduces the split on the filter tow strand.
- Claims 10 and 11 contain measures with which not only the tow split is better avoided, but also an adaptation of the cross section to the desired cross section of the filter strand to be produced is achieved at the same time.
- Claim 12 contains features of a currently preferred embodiment of the device according to the invention. The features of claim 13 increase the formation of tow split reducing effect of the device proposed according to the invention.
- the invention offers the advantage that the density distribution of the tow material in the strand cross-section is evened out during filter production from a filter tow strip in the strand process, and thus the formation of so-called tow split in the filter tow strand and in the products produced from the filter tow strand is avoided.
- This is achieved according to the invention with the surprisingly simple measure of the additional deflection of the filter tow strand in a second plane of movement.
- the filter tow strand is delivered to the filter strand machine in a cross-sectional shape approximating the filter strand to be produced. The design and mechanical engineering effort required for this is low.
- FIG. 1 schematically shows a machine for producing a filter tow strand from a filter tow strip as an exemplary embodiment of the invention.
- the illustration essentially only contains the functional parts of the machine which act on the filter tow strip or the filter tow strand for its processing. Details of the structural design of the machine are not shown for reasons of better clarity, since they are generally known to the applicant from the AF type machines on the market.
- the filter tow to be processed e.g. consists of cellulose acetate threads, is drawn off as a filter towstrip 1 from a supply, for example a towball 2.
- the filter tow strip then passes through a draw-off section 4, a pre-stretching section 6, a stretching section 7, an application section 8, a gathering section 9, a feed section 11 and an inlet device 12 of a filter strand machine 13, which is only indicated schematically, e.g. of the type KDF2 or KDF3 of the applicant known in the tobacco processing industry.
- the filter tow strip reaches the stretching section 6 via deflection rollers 17 (spreading nozzles are described in US Pat. No. 4,259,769).
- the pre-stretching section 6 is formed on the one hand by a pair of rollers 18 with rollers 19 and 21 and on the other hand by a pair of rollers 22 with motor-driven rollers 23 and 24.
- the rollers 19 and 21 are towed by the filter tow strip 1, ie they run along with more or less resistance. If necessary, they can be motor-driven or braked in a known manner in a controlled manner.
- the stretching between the towed rollers 19 and 21 of the pair of rollers 18 and the motor Driven rollers 23 and 24 of the pair of rollers 22 result in an equalization of the filter tow strip and leads to a better spreading of the strip transverse to its conveying direction 3.
- the pre-stretching section 6 can be assigned further processing devices.
- a drying device 26 can be seen, with which the filter tow strip is conditioned in a controlled manner as a function of its speed to a predetermined, preferably constant, relative humidity (water).
- a suitable drying device 26 is marketed under the name Weko-Heat dryer by Haug GmbH and Co KG, Postfach 200333, D-70771 Leinfelden (Echterdingen).
- further devices (not shown in the drawing) for processing and treating the filter tow strip can be arranged, such as a device for applying electrostatic charges of high potential, which ensure good separation of the individual, still adhering threads of the filter tow strip by electrostatic repulsive forces what is advantageous for the subsequent application of solvent to the filter tow strips. Details of the application of electrostatic charges are shown in US Pat. No. 3,817,211 and US Defensive Publication 665,476, US Official Gazette 860/3 of March 18, 1969.
- the pair of rolls 22 is followed by the stretching section 7, which runs vertically or with an essentially vertical component from top to bottom in the exemplary embodiment shown, which consists of the upstream pair of rolls 22 with the rolls 23 and 24 and a further pair of rolls 27 with rolls 28 and 29 consists.
- the rollers 28 and 29 are driven by a motor. Their peripheral speed is slightly greater than the peripheral speed of the upstream rollers 23 and 24, so that the filter tow strip 1 is stretched between these two roller pairs 22 and 27 in a defined manner.
- the roller arrangement the stretching section and the roller configurations are known from the applicant's filter tow preparation devices AF1, AF2 and AF3 and are described, for example, in US Pat. Nos. 3,317,965 and 3,255,506. It has been shown that with a length of the stretching section 7 between 800 mm and 1200 mm, preferably about 1000 mm, a particularly good tow yield can be achieved.
- roller pair 27 is followed by a further pair of rollers 31 with rollers 32 and 33, which are again driven by a motor.
- the peripheral speed of the rollers 32 and 33 can be lower than that of the rollers 28 and 29, so that the filter tow strip between the roller pairs 27 and 31 can easily relax.
- the at least approximately horizontal application section 8 in the device shown as an exemplary embodiment, in which an application device 34 on the filter tow strip a solvent for the filter tow material, e.g. Triacetin, sprayed on.
- a solvent for the filter tow material e.g. Triacetin
- the filter tow strip 1 in the embodiment of the machine shown in the drawing is conveyed upwards between the pair of rolls 31 and a deflecting roll 36 vertically or with a predominantly vertical component.
- the gathering section 9 can contain one or more successive gathering devices in the form of wire loops, the diameter of which decreases in the conveying direction of the filter tow strip and thus reduces the width of the filter tow strip.
- the gathering device 37 consists of a corrugated guide 38 which converges from the pair of rollers 31 towards the deflecting roller 36 and thus reduces the width of the filter tow strip, so that this lateral gathering of the filter tow strip 39 results in a filter tow strand 39, the cross section of which already corresponds to the cross section of the filter strand to be produced is approximated.
- the deflection roller 36 deflects the filter tow strand 39 into the feed section 11, through which it reaches the inlet device 12 of the filter strand machine 13.
- the course of the filter tow strand 39 from the gathering section 9 around the deflection roller 36 into the feed section 11 defines a vertical movement path plane, in which, in the exemplary embodiment of the machine according to the invention shown, the entire spreading and preparation of the filter tow takes place.
- This trajectory plane is an imaginary plane in which an arbitrarily assumed point of the filter tow strand or strip moves when passing through the machine or a conveyor path section in the machine.
- the plasticizer sprayed onto the spread filter tow stripes causes the fibers of cellulose acetate contained in the tow stripes to dissolve superficially, so that touching fibers stick together and adhere to one another at the contact points. If the filter tow strip that has been spread out and sprayed with plasticizer is gathered together laterally, a filter tow strand is created in which the fibers stick to one another at many points of contact. This gives the filter strand made from the filter tow strand its stable consistency and at the same time its filtering effect for tobacco smoke.
- Zones of lower density preferably lie in certain cross-sectional areas, for example along a vertical radial plane of the strand. In these zones of lower density, the cohesion between the fibers of the gathered tow material is weakened, so that the strand or the filter made from it can break apart or break here. These zones of lower density are therefore also called "Towsplit". They represent a serious problem with filters Lack of quality, which can not only affect the stability of the filter, but also its filtering effect for tobacco smoke
- a guide device 41 is assigned to the feed section 11, which is shown as view B in FIG. 2.
- it consists of three deflection rollers 42, 43 and 44, which guide the filter tow line 39 in a second plane of movement path perpendicular to the first.
- the pulleys are driven.
- a motor 53 is shown in FIG. 1 to drive the roller 42.
- the two other rollers 43 and 44 can also be driven by the motor 53 via a transmission (not shown) or by separate motors (not shown) via their axes 54 or 56.
- the deflection roller 42 deflects the filter tow strand 39 to the side from the first movement path plane defined by the pair of rollers 31, the deflection roller 36 and the inlet device 12 and into the second movement path plane.
- the direction of movement of the filter tow strand 39 is reversed around the deflection roller 43, and the filter tow strand is returned to the original movement path plane by the third deflection roller 44.
- This lateral deflection around the deflection rollers 42 to 44 sequentially loads the filter tow strand from both sides and compresses it laterally more strongly. This also results in better bonding of the fibers that have not yet cured again at this stage, the result of which is an even distribution of the density of the tow material in the strand cross section.
- Zones of lower density which are the cause of the occurrence of the so-called Towsplit, are largely prevented, if not completely excluded.
- the radii of the fillets 46, 47 and 48 in the peripheral surfaces the deflection rollers 42 to 44 decrease in the conveying direction from the deflection roller to the deflection roller. It is thereby achieved that the filter tow strand 39 is further compressed and summarized as it moves around the deflection rollers 42 to 44, whereby not only its cross section is increasingly approximated to the cross section of the filter strand to be produced, but also the crosslinking of the fibers in the strand is intensified and the density is homogenized over the strand cross-section. This also helps to avoid the unwanted tow split and thus to improve the quality of the products manufactured
- the filter tow strand 39 in the second movement path plane In addition to deflecting the filter tow strand 39 in the second movement path plane, it can be deflected at least once in the first movement path plane. This is realized in the machine described by the deflection roller 36 and causes the strand to be intensively compressed in a second radial plane. This further increases the effect of preventing the split of the device and method proposed according to the invention.
- the filter tow strand After the filter tow strand is returned from the last deflection roller 44 of the guide device 41 back to the original movement path plane, it is passed through a stuffing nozzle 51, which is pressurized with compressed air from a compressed air source 49, into the inlet funnel 52 of the inlet device 12 of the filter rod machine 13, which transfers it to a filter rod and further processed into filter sections.
Landscapes
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4443866A DE4443866A1 (de) | 1994-12-09 | 1994-12-09 | Verfahren und Vorrichtung zum Bilden eines Filtertowstrangs der tabakverarbeitenden Industrie |
DE4443866 | 1994-12-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0715816A2 true EP0715816A2 (fr) | 1996-06-12 |
EP0715816A3 EP0715816A3 (fr) | 1999-11-03 |
Family
ID=6535374
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95118616A Withdrawn EP0715816A3 (fr) | 1994-12-09 | 1995-11-27 | Procédé et dispositif pour la formation d'une tige de filtre dans l'industrie du tabac |
Country Status (4)
Country | Link |
---|---|
US (1) | US5725467A (fr) |
EP (1) | EP0715816A3 (fr) |
CN (1) | CN1133148A (fr) |
DE (1) | DE4443866A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005058079A1 (fr) * | 2003-11-25 | 2005-06-30 | Hauni Maschinenbau Aktiengesellschaft | Dispositif pour preparer une meche de filtre et dispositif de production de filtres |
EP2022351A3 (fr) * | 2007-08-07 | 2010-09-01 | G.D S.p.A. | Appareil de traitement d'au moins une bande de matériau à filtres dans l'industrie du tabac |
CN1913791B (zh) * | 2004-03-16 | 2010-11-10 | 日本烟草产业株式会社 | 制滤咀机 |
WO2011042174A3 (fr) * | 2009-10-09 | 2011-06-30 | Philip Morris Products S.A. | Procédé et appareil permettant de fabriquer un ensemble filtre d'article pour fumeurs incluant des fibres chargées de façon électrostatique |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9124249D0 (en) * | 1991-11-14 | 1992-01-08 | Goldstein Fredric | Ribbon curling and shredding device |
DE19751598B4 (de) * | 1997-11-21 | 2008-04-17 | Hauni Maschinenbau Ag | Verfahren und Vorrichtung zum Behandeln eines Filtertowstreifens |
DE19756138B4 (de) * | 1997-12-17 | 2005-12-29 | Hauni Maschinenbau Ag | Förderanordnung zum Fördern von stabförmigen Artikeln der tabakverarbeitenden Industrie |
US7074170B2 (en) * | 2002-03-29 | 2006-07-11 | Philip Morris Usa Inc. | Method and apparatus for making cigarette filters with a centrally located flavored element |
EP2110031A1 (fr) | 2008-04-18 | 2009-10-21 | Philip Morris Products S.A. | Appareil de fabrication de filtres |
DE102011100504A1 (de) * | 2011-04-29 | 2012-10-31 | Hauni Maschinenbau Ag | Vorrichtung zur Herstellung von Filtern der Tabak verarbeitenden Industrie |
CN104302196B (zh) * | 2012-03-05 | 2017-11-10 | 蒙特拉德有限公司 | 用于向滤嘴棒成型机供应过滤材料的方法和装置 |
PL2772146T3 (pl) * | 2013-02-28 | 2019-03-29 | Hauni Maschinenbau Gmbh | Urządzenie, sposób i maszyna do wytwarzania kabla filtrowego przemysłu przetwórstwa tytoniu |
JP2021532279A (ja) * | 2018-05-31 | 2021-11-25 | アルガマン テクノロジーズ リミテッド | 天然繊維に化合物を適用する方法及びシステム並びにそれから得られる処理繊維 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4522616A (en) * | 1982-03-10 | 1985-06-11 | Celanese Corporation | Method and apparatus for forming cigarette filter rods |
US4537583A (en) * | 1983-02-18 | 1985-08-27 | R. J. Reynolds Tobacco Company | Method and apparatus for conveying filter tow |
US5060664A (en) * | 1986-11-28 | 1991-10-29 | Korber Ag | Method of and apparatus for making streams containing fibrous materials of the tobacco processing industry |
DE4240089A1 (de) * | 1992-11-28 | 1994-06-01 | Hauni Werke Koerber & Co Kg | Anordnung zum Bilden eines Stranges aus Filtertow |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3255506A (en) * | 1963-02-20 | 1966-06-14 | Eastman Kodak Co | Tow treatment |
GB1092070A (en) * | 1964-07-11 | 1967-11-22 | Honshu Paper Co Ltd | A method of manufacturing sheet material |
US3317965A (en) * | 1964-09-11 | 1967-05-09 | Osaka Kiko Kabushiki Kaisha | Tow filament separating apparatus |
JPS4817080B1 (fr) * | 1969-01-22 | 1973-05-26 | ||
US3974007A (en) * | 1970-04-11 | 1976-08-10 | Hauni-Werke Korber & Co., Kg | Method and apparatus for the production of filter rod sections or the like |
US3800676A (en) * | 1970-05-13 | 1974-04-02 | Celanese Corp | Filters |
US3817211A (en) * | 1972-02-22 | 1974-06-18 | Owens Corning Fiberglass Corp | Apparatus for impregnating strands, webs, fabrics and the like |
GB1463114A (en) * | 1974-01-28 | 1977-02-02 | Rothmans Of Pall Mall | Method and apparatus for the opening of tow |
IT1059735B (it) * | 1975-05-14 | 1982-06-21 | Hauni Werke Koerber & Co Kg | Dispositivo di strramento per una macchina per la fabbricazione di filtri per l industria la orante il tabacco |
CH627056A5 (fr) * | 1977-12-15 | 1981-12-31 | Baumgartner Papiers Sa | |
DE2814605A1 (de) * | 1978-04-05 | 1979-10-18 | Hauni Werke Koerber & Co Kg | Verfahren und vorrichtung zum ausbreiten einer bewegten luftdurchlaessigen gewebebahn |
GB2020158B (en) * | 1978-04-21 | 1982-11-24 | Cigarette Components Ltd | Production of tobacco smoke filters |
US4511420A (en) * | 1980-12-16 | 1985-04-16 | Molins, Ltd. | Continuous rod manufacture |
US4549875A (en) * | 1983-06-02 | 1985-10-29 | R. J. Reynolds Tobacco Co. | Manufacture of tobacco smoke filters |
US4699606A (en) * | 1986-08-18 | 1987-10-13 | Celanese Corporation | Apparatus for detecting and/or controlling tension of a moving web, for example, a filamentary tow utilized in the production of cigarette filters |
GB8916589D0 (en) * | 1989-07-20 | 1989-09-06 | Tabac Fab Reunies Sa | Control process and apparatus for the production of cigarette filters |
DE4109603A1 (de) * | 1991-03-23 | 1992-09-24 | Hauni Werke Koerber & Co Kg | Verfahren und vorrichtung zum herstellen von filterstaeben fuer zigaretten |
GB9200904D0 (en) * | 1992-01-16 | 1992-03-11 | Molins Plc | Cigarette filter manufacture |
-
1994
- 1994-12-09 DE DE4443866A patent/DE4443866A1/de not_active Withdrawn
-
1995
- 1995-11-14 US US08/557,462 patent/US5725467A/en not_active Expired - Fee Related
- 1995-11-27 EP EP95118616A patent/EP0715816A3/fr not_active Withdrawn
- 1995-12-08 CN CN95121867.0A patent/CN1133148A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4522616A (en) * | 1982-03-10 | 1985-06-11 | Celanese Corporation | Method and apparatus for forming cigarette filter rods |
US4537583A (en) * | 1983-02-18 | 1985-08-27 | R. J. Reynolds Tobacco Company | Method and apparatus for conveying filter tow |
US5060664A (en) * | 1986-11-28 | 1991-10-29 | Korber Ag | Method of and apparatus for making streams containing fibrous materials of the tobacco processing industry |
DE4240089A1 (de) * | 1992-11-28 | 1994-06-01 | Hauni Werke Koerber & Co Kg | Anordnung zum Bilden eines Stranges aus Filtertow |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2213184B1 (fr) | 2003-11-25 | 2013-01-09 | Hauni Maschinenbau AG | Dispositif de préparation d'une mèche de filtre et dispositif de fabrication de filtres |
EP2292107A1 (fr) | 2003-11-25 | 2011-03-09 | Hauni Maschinenbau Aktiengesellschaft | Dispositif de préparation d'une mèche de filtre et dispositif de fabrication de filtres |
EP2213182A1 (fr) * | 2003-11-25 | 2010-08-04 | Hauni Maschinenbau AG | Dispositif de préparation d'une mèche de filtre et dispositif de fabrication de filtres |
CN1886070B (zh) * | 2003-11-25 | 2012-05-30 | 豪尼机械制造股份公司 | 用于制备过滤纤维材料的装置以及用于制造过滤嘴的装置 |
US7811220B2 (en) | 2003-11-25 | 2010-10-12 | Hauni Maschinenbau Ag | Device for processing filter tow material, and device for the production of filters |
WO2005058079A1 (fr) * | 2003-11-25 | 2005-06-30 | Hauni Maschinenbau Aktiengesellschaft | Dispositif pour preparer une meche de filtre et dispositif de production de filtres |
EP2213184A1 (fr) * | 2003-11-25 | 2010-08-04 | Hauni Maschinenbau AG | Dispositif de préparation d'une mèche de filtre et dispositif de fabrication de filtres |
CN1913791B (zh) * | 2004-03-16 | 2010-11-10 | 日本烟草产业株式会社 | 制滤咀机 |
EP2022351A3 (fr) * | 2007-08-07 | 2010-09-01 | G.D S.p.A. | Appareil de traitement d'au moins une bande de matériau à filtres dans l'industrie du tabac |
CN101361592B (zh) * | 2007-08-07 | 2013-12-04 | 吉地股份公司 | 烟草工业中用于处理至少一个过滤嘴材料条带的设备 |
WO2011042174A3 (fr) * | 2009-10-09 | 2011-06-30 | Philip Morris Products S.A. | Procédé et appareil permettant de fabriquer un ensemble filtre d'article pour fumeurs incluant des fibres chargées de façon électrostatique |
US8534294B2 (en) | 2009-10-09 | 2013-09-17 | Philip Morris Usa Inc. | Method for manufacture of smoking article filter assembly including electrostatically charged fiber |
US9788572B2 (en) | 2009-10-09 | 2017-10-17 | Philip Morris Usa Inc. | Method and apparatus for manufacture of smoking article filter assembly including electrostatically charged fibers |
US10226070B2 (en) | 2009-10-09 | 2019-03-12 | Philip Morris Usa Inc. | Filter rod including electrostatically charged fibers |
Also Published As
Publication number | Publication date |
---|---|
DE4443866A1 (de) | 1996-06-13 |
EP0715816A3 (fr) | 1999-11-03 |
CN1133148A (zh) | 1996-10-16 |
US5725467A (en) | 1998-03-10 |
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