WO2011042175A1 - Filtre de cigarette permettant de réduire les rendements en fumée des dernières bouffées - Google Patents

Filtre de cigarette permettant de réduire les rendements en fumée des dernières bouffées Download PDF

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Publication number
WO2011042175A1
WO2011042175A1 PCT/EP2010/006108 EP2010006108W WO2011042175A1 WO 2011042175 A1 WO2011042175 A1 WO 2011042175A1 EP 2010006108 W EP2010006108 W EP 2010006108W WO 2011042175 A1 WO2011042175 A1 WO 2011042175A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
segment
smoking article
flow
channeled
Prior art date
Application number
PCT/EP2010/006108
Other languages
English (en)
Inventor
Raquel Olegario
San Ll
Mike Braunshteyn
Roland W. Dwyer
Richard Jupe
Original Assignee
Philip Morris Products S.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 Philip Morris Products S.A. filed Critical Philip Morris Products S.A.
Publication of WO2011042175A1 publication Critical patent/WO2011042175A1/fr

Links

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
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A24D3/043—Tobacco smoke filters characterised by their shape or structure with ventilation means, e.g. air dilution
    • 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
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A24D3/045—Tobacco smoke filters characterised by their shape or structure with smoke acceleration means, e.g. impact-filters

Definitions

  • cigarettes with high levels of ventilation have usually had unacceptably low levels of resistance to draw (RTD) unless some counter measure was in place to make up for the shortfall in RTD.
  • RTD resistance to draw
  • high-density cellulose acetate filter segments were used to address the short fall.
  • filtered segments tended to reduce tar delivery (FTC), with little or no effect upon gas phase components of mainstream tobacco smoke, such as carbon monoxide (CO) and nitrogen oxide (NO). This solution tended to worsen the CO to tar (FTC) ratios in filtered (FTC tar) cigarettes.
  • Ventilation has a desirable attribute in that, when operating alone, it will reduce both the particulate phase and the gas phase of mainstream smoke.
  • highly ventilated cigarettes have drawbacks in resistance to draw (RTD) as previously discussed. It can be appreciated that with a flow restricting orifice in the cigarette filter, the mainstream smoke is forced to flow through the orifice. With the filter ventilation introduced downstream from this orifice, the ventilation level is dependent on the overall resistance to draw (RTD) upstream from the ventilation holes. For a given number of ventilation holes and size, the filter ventilation level increases as the upstream RTD increases. At a given filter efficiency, increased filter ventilation reduces the smoke tar delivery.
  • tar delivery increases as smoking progresses through the puff count. This is mainly due to the combination of reduced filtration from the tobacco rod, re-vaporization of tar build up on the tobacco rod from previous puff(s), and a decreased filter ventilation contribution as the puff (char line) progresses and the upstream RTD reduces.
  • the tar delivery of the last puff could be twice as much as the first and/or second puffs. Reducing the degree of change from early to later puffs in principle would permit for a more consistent sensorial experience, and reducing the total tar delivery, without significantly affecting the overall smoking experience.
  • FIG. 1 is a cross-sectional view of a smoking article in accordance with one embodiment.
  • FIG. 2 is a cross-sectional view of the smoking article of FIG. 1 in accordance with another embodiment.
  • FIG. 3 is a cross-sectional view of a smoking article in accordance with another embodiment.
  • FIG. 4 is a cross-sectional view of the smoking article of FIG. 3, in accordance with a further embodiment.
  • FIG. 5 is a graph showing the puff by puff total particulate matter (TP ) deliveries of a conventional cellulose acetate (CA) filtered cigarette.
  • a channeled flow segment is designed such that during the process of smoking the cigarette, the resistance to flow of smoke through a channel within the segment increases as a result of tar accumulation or build-up within the channel.
  • the increased resistance causes the filter ventilation to increase and the delivered tar is decreased in the later puffs.
  • the increased resistance to draw (RTD) and filter ventilation during the later puffs can also be designed so that it is difficult to smoke the last few puffs (where tar per puff can be twice as much as the first few puffs) thereby reducing the total tar delivery without significantly impacting the overall smoking experience.
  • RTD resistance to draw
  • filter ventilation during the later puffs can also be designed so that it is difficult to smoke the last few puffs (where tar per puff can be twice as much as the first few puffs) thereby reducing the total tar delivery without significantly impacting the overall smoking experience.
  • a desired pressure drop across the segment can be achieved depending on the size (inner diameter) and the length of the flow channel.
  • a preferred embodiment provides a smoking article 10 comprising a tobacco rod 20 and a filter 30 connected with the tobacco rod 20 by an outer wrapper or tipping paper 28.
  • the filter 30 comprises a first filter segment 40 at an upstream portion 32 of the filter 30, a second or mouthpiece filter segment 50 at downstream end portion 34 of the filter 30, and a channeled flow segment 60 situated between the first and mouthpiece filter segments 40, 50.
  • the first and mouthpiece filter segments 40, 50 are low particulate efficiency filter segments constructed from cellulose acetate tow.
  • smoking articles 10 in the form of cigarettes typically include a generally cylindrical rod 20 of smokable material 22, contained in a circumscribing porous wrapping material or paper wrapper 24.
  • the rod 20 is typically referred to as a "tobacco rod” and has a lit end or upstream end 12 and a downstream or filter end 14.
  • the smokable material 22 is preferably a shredded tobacco or tobacco cut filler. However, any suitable smokable material 22 can be used.
  • the filter 30 is adjacent to the filter end 14 of the tobacco rod 20 such that the filter 30 and tobacco rod 20 are axially aligned in an end-to-end relationship, preferably abutting one another.
  • the filter 30 preferably has a generally cylindrical shape, and the diameter thereof is essentially equal to the diameter of the tobacco rod 20.
  • the ends (that is, upstream end 16 and downstream end 18 (that is, mouth end or buccal end) of the filter 30 are open to permit the passage of air and smoke therethrough.
  • the filter 30 is preferably attached to the tobacco rod 20 by an outer wrapper or tipping paper 28, which circumscribes both the entire length of the filter 30 and an adjacent region of the tobacco rod 20.
  • the tipping paper 28 is typically a paper like product; however, any suitable material can be used.
  • the channeled flow segment 60 is adjacent to the first filter segment 50.
  • the channeled flow segment 60 including the flow channel 62 establishes a substantial portion of a predetermined resistance to draw of the smoking article 10.
  • the flow channel 62 is preferably coaxially or concentrically positioned within the channeled flow segment 60.
  • one or more flow channels 62 can be positioned on an outer periphery of the channeled flow segment 60.
  • the channeled flow segment 60 and the flow channel 62 each have a length of about 1 mm to 15mm.
  • the flow channel 62 also preferably has a diameter of approximately 0.5mm to 2mm.
  • the channeled flow segment 60 may be constructed of paper, a plastic or a metal and more preferably made of a paper product or a biodegradable plastic or other suitable material having degradability properties.
  • the flow channel 62 is generally straight, having a relatively constant diameter such that the channel 62 extends in a continuous direction without bending from an upstream end to a downstream end of the channeled flow segment 60.
  • the flow channel can be a spiral channel, or other suitable configuration.
  • the flow channel 62 is at least in part defined by a cylindrical tubular member 48, which is constructed from a relatively heavy filter plug wrap or paper.
  • the tubular member 48 preferably extends from an upstream end to a downstream end of the segment 60.
  • the channeled flow segment 60 is preferably sized to contribute sufficient pressure drop such that the smoking article 10 presents a resistance to draw of at least 50mm water or greater, and more preferably in the range of 70mm to 120mm water. It can be appreciated that as the channeled flow segments 60 becomes clogged, the resistance to draw and/or flow through the flow channel 62 increases due to the tar build up.
  • the channeled flow segment 60 has a diameter of approximately 7.0mm to 8.0mm, and more preferably approximately 7.4mm to 7.8mm.
  • a tubular body segment 64 at least partially defining a portion of a cavity 66 is situated between the mouthpiece filter 50 and the flow channel 62 of the channeled flow segment 60.
  • the filter 30 can also include a second upstream tubular body portion (not shown) that spaces the channeled flow segment 60 a predetermined distance apart from the first filter segment 40.
  • the smoking article 10 also preferably includes a ventilating zone 70 comprised of a first row (and optionally second and possibly third rows) of ventilation holes or perforations 72, each of which extend through the tipping paper 28, the plug wrap 26 and the tubular body segment 64.
  • the ventilating zone 70 is located near or adjacent to the channeled flow segment 60 so that air drawn through the ventilation zone 70 is allowed to mix with the mainstream smoke from the flow channel 62 before arriving at the mouthpiece filter segment 50.
  • the distance between the ventilating zone 70 and the mouthpiece filter segment 50 is preferably at least 5mm and more preferably in the range of 5mm to12mm.
  • the holes or perforations 72 of the ventilating zone 70 achieve a ventilation level of the smoking article 10 of at least 25% and more preferably at least 50% to 90%.
  • mainstream smoke is drawn from the lit end through the tobacco rod 20 to the downstream end of the filter 30, and drawn through the flow channel 62.
  • the flow channel 62 is partially blocked.
  • RTD resistance to draw
  • the flow distribution of the flow channel 62 can be depend on several factors including the length of the filter 30 and the flow channel 62, the inner diameter of the flow channel 62, and the nature or type of filter materials within the first filter segment 40 and the mouthpiece segment 50.
  • the first filter segment 40 and the mouthpiece filter segment 50 are preferably a starch-based, polypropylene, or plasticized cellulose acetate tow, filter paper or other suitable material.
  • the first filter segment 40 and the mouthpiece segment 50 can also be constructed from a gathered web (e.g., polypropylene web, polyester web, cellulosic web or starch-based web).
  • tar gradually builds up inside and at the ends of the flow channel 62. Resistance to flow through the flow channel 62 increases due to the tar build up as shown in FIG. 2, and as a consequence the filter ventilation increases and the tar deliveries decreases in the later puffs. A more consistent puff-by-puff tar delivery is thus achieved attributable to the lowered delivery of the later puffs.
  • the increased filter ventilation results in a decreased amount of tobacco burnt and smoke delivered.
  • the increased resistance to draw (RTD) and filter ventilation during the later puffs can also be designed so that it is difficult to smoke the last few puffs. It is generally accepted that the first few puffs or earlier puffs are more important in terms of the smoking experience, and wherein the reduced tar deliveries in the last few puffs from this novel filter design can have overall tar reduction with minimum impact on the smoking experience. It can also be appreciated that the flow channel 62 can be fine tuned to control the tar build up, by adjusting or changing the size of the channel 62, including the length and diameter thereof, so that the resistance-to-draw (RTD) is acceptable and ventilation of the filter 30 achieves desired tar delivery from the smoking article 10.
  • the flow channel 62 can include or be coated with a material 49 (FIG. 2) such as a sintered porous plastic.
  • a material 49 such as a sintered porous plastic.
  • the flow channel is filled with a sintered porous plastic.
  • sintered porous plastics can allow "dry” air flow at a given resistance to draw (RTD).
  • RTD resistance to draw
  • the resistance to draw (RTD) can increase when a "wet" stream is delivered in the flow channel 62.
  • the flow channel 60 can be in the form of a thin plate 100 (0.2mm to 2mm in thickness) with at least one orifice (or flow passage) 1 10 with a diameter of 0.2mm to 0.6mm.
  • the number of orifices 1 10 is not limited, but preferably the plate 100 has 2 to 8 orifices, and is mostly determined by the pressure drop introduced by this thin plate with orifices.
  • the pressure drop is preferably in the range of 100mm to 500mm water drop.
  • smoke tar gradually builds up and partially blocks the orifices 1 10 which cause pressure drop increase. This pressure drop increase would force more air flowing through the filter ventilation holes 72, or ventilation level increases.
  • the filter 30 will have lower ventilation in the earlier puffs and higher ventilation in later puffs.
  • the net effect of gradual increase of ventilation as smoking processes is more smoke in the earlier puffs and less smoke in the latter puffs, resulting more consistent puff by puff smoke deliveries.
  • the filter 30 may be constructed from simple combining techniques typically used in the industry for manufacturing cigarettes at high speeds. Additionally each embodiment includes support about the cavity 66 to provide desired firmness throughout length of the filter 30.
  • FIG. 5 shows puff by puff total particulate matter (TPM) (mg) deliveries of a conventional cellulose acetate filtered cigarette.
  • TPM puff by puff total particulate matter
  • FIG. 5 shows puff by puff total particulate matter (TPM) (mg) deliveries of a conventional cellulose acetate filtered cigarette.
  • smoke tar tracks with smoke total particulate matter (TPM).
  • the average total particulate matter (TPM) of the first three puffs is 1.0mg/puff, and the average of the last three puffs is 1.8mg/puff.
  • the total particulate matter (TPM) from the whole cigarette is 1 1.3mg, with a total of 8 puffs.
  • the smoking articles 10 as shown in FIGS. 1-4 are able to deliver 8mg to 9mg total particulate matter (TPM) with a smoking experience similar to that of a 11 mg total particulate matter (TPM) product, at least for the first half of smoking.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Abstract

La présente invention a trait à un article pour fumeurs (10) doté d'un boudin continu de tabac (20) conçu pour produire une fumée principale et d'un filtre (30) doté d'une partie d'extrémité amont (32) et d'une partie d'extrémité aval (34), lequel filtre est agencé de manière à recevoir la fumée principale au niveau de la partie d'extrémité amont. Le filtre inclut un premier segment de filtre (40) à faible efficacité particulaire au niveau de la partie d'extrémité amont ; un segment d'écoulement canalisé (60) adjacent au premier segment de filtre, ledit segment d'écoulement canalisé incluant un canal d'écoulement (62) établissant une partie substantielle de résistance prédéterminée à la traction de l'article pour fumeurs ; un segment de filtre d'embout (50) à faible performance particulaire au niveau de la partie d'extrémité aval ; et un segment de corps tubulaire (64) définissant au moins partiellement une partie d'une cavité (66) située entre le segment de filtre d'embout et le segment d'écoulement canalisé. Du papier de manchette (28) attache le filtre au boudin continu de tabac et inclut une zone de ventilation d'admission d'air (70) à un emplacement le long du segment de corps tubulaire.
PCT/EP2010/006108 2009-10-09 2010-10-06 Filtre de cigarette permettant de réduire les rendements en fumée des dernières bouffées WO2011042175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/577,039 2009-10-09
US12/577,039 US20110083687A1 (en) 2009-10-09 2009-10-09 Cigarette filter to reduce smoke deliveries in later puffs

Publications (1)

Publication Number Publication Date
WO2011042175A1 true WO2011042175A1 (fr) 2011-04-14

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PCT/EP2010/006108 WO2011042175A1 (fr) 2009-10-09 2010-10-06 Filtre de cigarette permettant de réduire les rendements en fumée des dernières bouffées

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Country Link
US (1) US20110083687A1 (fr)
WO (1) WO2011042175A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013042609A1 (fr) * 2011-09-20 2013-03-28 日本たばこ産業株式会社 Cigarette
CN103040112A (zh) * 2012-12-31 2013-04-17 蚌埠卷烟材料厂 间隙图案滤嘴棒
CN103110186A (zh) * 2012-12-29 2013-05-22 广东中烟工业有限责任公司 一种二元复合空心烟草纤维纸质滤棒及其制备方法
WO2014091605A1 (fr) 2012-12-13 2014-06-19 日本たばこ産業株式会社 Cigarette

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RU2663381C1 (ru) * 2014-08-07 2018-08-03 Джапан Тобакко Инк. Сигарета с фильтром
EP3446573B1 (fr) 2017-08-24 2020-11-04 JT International S.A. Papier d'emballage pour article à fumer
CN107568788A (zh) * 2017-09-11 2018-01-12 云南中烟工业有限责任公司 一种含气流隧道的三段式卷烟滤嘴
KR20210101222A (ko) 2018-12-17 2021-08-18 필립모리스 프로덕츠 에스.에이. 에어로졸 발생 장치와 함께 사용하기 위한 에어로졸 발생 물품
CN111588079A (zh) * 2020-05-19 2020-08-28 云南中烟工业有限责任公司 一种可控吸阻的密闭加热式烟支
CN111838758B (zh) * 2020-07-23 2023-08-11 内蒙古昆明卷烟有限责任公司 一种烟嘴及应用其的烟具组件

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