EP3178333B1 - Cigarette with filter - Google Patents

Cigarette with filter Download PDF

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Publication number
EP3178333B1
EP3178333B1 EP14899311.6A EP14899311A EP3178333B1 EP 3178333 B1 EP3178333 B1 EP 3178333B1 EP 14899311 A EP14899311 A EP 14899311A EP 3178333 B1 EP3178333 B1 EP 3178333B1
Authority
EP
European Patent Office
Prior art keywords
filter
center hole
section
mouthpiece end
mainstream smoke
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.)
Active
Application number
EP14899311.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3178333A4 (en
EP3178333A1 (en
Inventor
Yu NINOMIYA
Kenichi ITABASHI
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.)
Japan Tobacco Inc
Original Assignee
Japan Tobacco Inc
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 Japan Tobacco Inc filed Critical Japan Tobacco Inc
Publication of EP3178333A1 publication Critical patent/EP3178333A1/en
Publication of EP3178333A4 publication Critical patent/EP3178333A4/en
Application granted granted Critical
Publication of EP3178333B1 publication Critical patent/EP3178333B1/en
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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
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • 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
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/062—Use of materials for tobacco smoke filters characterised by structural features
    • A24D3/063—Use of materials for tobacco smoke filters characterised by structural features of the fibers
    • 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
    • A24C5/47—Attaching filters or mouthpieces to cigars or cigarettes, e.g. inserting filters into cigarettes or their mouthpieces
    • 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
    • A24D1/00—Cigars; Cigarettes
    • A24D1/04—Cigars; Cigarettes with mouthpieces or filter-tips
    • A24D1/045—Cigars; Cigarettes with mouthpieces or filter-tips with smoke filter means
    • 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

Definitions

  • the present invention relates to a filter cigarette.
  • a filter cigarette is configured to adjust a balance between air dilution caused by ventilation air being introduced through a vent hole formed in an outer periphery of a filter, and filtration with a filtration material to control (adjust) components of smoke of the cigarette, such as tar, nicotine, or CO (carbon monoxide).
  • CO is a gas phase component and thus not filtered by a filtration material, and dilution with air reduces the concentration of CO in smoke. Meanwhile, tar is reduced by both filtration with a filtration material, and dilution with air.
  • low filtration and high dilution design is sometimes made including reducing a ratio of filtration with a filtration material and increasing a ratio of dilution. It is expected that the low filtration and high dilution design can reduce the ratio of CO to tar, and increase inhaling satisfaction to improve fragrance inhaling taste.
  • a method is known in which a fiber diameter of a filtration material is increased to reduce density and thus reduce ventilation resistance of mainstream smoke, or a diameter of a vent hole through which ventilation air flows in is increased, thereby increasing a ratio of dilution.
  • a limit in reducing ventilation resistance of a filtration material by the above method due to restriction in a circumferential length of a cigarette, a length of a filter, a material used for the filtration material, or the like.
  • a design method of placing a section without a function of filtering mainstream smoke in a partial zone of a filter for example, a design method of placing a center hole filter with a through hole at an axial center, or forming a recess, a cavity, or the like in a partial zone of the filter to achieve low filtration and high dilution.
  • Examples of the prior art can be found in documents EP 0 579 410 A1 , GB 2135865 A and JP S59 203483 A .
  • Patent document 1 Japanese Patent Laid-Open No. 5-23158 Summary of Invention
  • the present invention is achieved in view of the above described problems, and has an object to provide a technique of making tar contamination on a mouthpiece end surface less noticeable, and preventing insufficient hardness of a filter, in a filter cigarette.
  • a penetration path is formed for causing mainstream smoke to flow through a mouthpiece end section placed at a mouthpiece end of a filter, and a front section connected to a front end of the mouthpiece end section, and a channel sectional area of the penetration path in the mouthpiece end section is larger than a channel sectional area of the penetration path in the front section.
  • the present invention provides a filter cigarette including the features of claim 1.
  • a flow velocity (flow rate) of the mainstream smoke flowing in a region on an outer peripheral side that does not axially overlap the penetration path of the front section is relatively slower (lower) as compared to a region on a central side that axially overlaps the penetration path of the front section in a cross sectional area of the penetration path in the mouthpiece end section.
  • a length of the mouthpiece end section may be shorter than a length of the front section.
  • Solutions to the problem in the present invention can be used in combination as much as possible.
  • the present invention can provide a technique of making tar contamination on a mouthpiece end surface less noticeable, and preventing insufficient hardness of a filter, in a filter cigarette.
  • Fig. 1 is a vertical sectional view of a cigarette 1 according to embodiment 1, which is not covered by the present invention.
  • Fig. 2 is a perspective view of the cigarette 1 according to Embodiment 1.
  • the cigarette 1 is a filter cigarette including a tobacco rod 2, and a filter 4 connected to an end of the tobacco rod 2 via chip paper 3.
  • the tobacco rod 2 is formed such that cut(shredded) tobacco 21 is rolled by cigarette paper 22 into a cylindrical shape (rod shape), and also referred to as a "single roll".
  • the filter 4 is a member for filtering smoke component contained in mainstream smoke generated during smoking of the cigarette 1 when the mainstream smoke passes therethrough, and formed into a cylindrical shape having substantially the same diameter as the tobacco rod 2.
  • the filter 4 is wrapped by the chip paper 3, and connected to a rear end side of the tobacco rod 2 via the chip paper 3.
  • the chip paper 3 integrally wraps and connects (couples) the end of the tobacco rod 2 and the filter 4.
  • a longitudinal direction (axial direction) of the tobacco rod 2 an end to be connected to the filter 4 is referred to as a "rear end”, and an end opposite thereto is referred to as a "front end” (tip).
  • a longitudinal direction (axial direction) of the filter 4 an end to be connected to the tobacco rod 2 is referred to as a "front end", and an end opposite to the front end is referred to as a "mouthpiece end”.
  • a section in the longitudinal direction (axial direction) of the cigarette 1 is defined as a "vertical section”, and a section perpendicular thereto is defined as a "cross section”.
  • reference character CL in Fig. 1 denotes a central axis of the cigarette 1 (tobacco rod 2, filter 4).
  • a filtering section S1 a front section S2, and a mouthpiece end section S3 are arranged in this order from the front end side.
  • a filtration material 41 is provided such that a fiber bundle of cellulose acetate formed into a cylindrical shape is rolled by rolling paper.
  • the filtration material 41 in this embodiment is not limited to the fiber bundle of cellulose acetate, but may be made of various materials.
  • center hole filters 42, 43 are placed such that fiber bundles of cellulose acetate formed into a cylindrical shape and axially provided with penetration paths are rolled by rolling paper.
  • the penetration path formed in the center hole filter 42 in the front section S2 is referred to as a "first center hole 42a”.
  • the penetration path formed in the center hole filter 43 in the mouthpiece end section S3 is referred to as a "second center hole 43a”.
  • the first center hole 42a axially extends through the center of the center hole filter 42.
  • the second center hole 43a axially extends through the center of the center hole filter 43.
  • the first center hole 42a and the second center hole 43a are smoke channels (passages) through which mainstream smoke flows (passes).
  • the first center hole 42a and the second center hole 43a are coaxially placed, and a sectional area of the second center hole 43a is larger than a sectional area of the first center hole 42a.
  • a sectional area of the penetration path in the mouthpiece end section S3 is larger than a sectional area of the penetration path in the front section S2.
  • the mouthpiece end section S3 (center hole filter 43) in the filter 4 is shorter than the front section S2 (center hole filter 42).
  • the first center hole 42a and the second center hole 43a each have a circular sectional shape, but not limited to this.
  • the chip paper 3 that wraps the filter 4 has a vent hole 31 through which ventilation air (outside air) is introduced into the filter 4 for dilution of mainstream smoke.
  • ventilation air outside air
  • the vent hole 31 is placed in a position corresponding to the filtering section S1 in the filter 4.
  • outside air flows through the vent hole 31 into the filter 4, and the air introduced through the vent hole 31 is mixed with the mainstream smoke flowing from the tobacco rod 2 into the filter 4 to dilute the mainstream smoke.
  • FIG. 3 illustrates a manufacturing device 100 of the center hole filter.
  • the manufacturing device 100 includes a storage container 110 storing filter fiber (for example, acetate tow) 150, a plasticizer addition unit 120, a forming device 130, a wrapping device 140, or the like.
  • the filter fiber 150 stored in the storage container 110 is fed along a predetermined feeding path. In the course of feeding, the filter fiber 150 is opened and expanded into a sheet shape.
  • the plasticizer addition unit 120 adds a plasticizer such as triacetin to the sheet-like filter fiber 150, and the sheet-like filter fiber 150 is supplied to the subsequent forming device 130.
  • the forming device 130 forms the sheet-like filter fiber 150 into a continuous filter of a hollow rod shape, and includes a mandrel (not illustrated) that is a tube-like forming path through which the sheet-like filter fiber 150 passes while being narrowed and is formed into a continuous filter of a hollow rod shape.
  • the sheet-like filter fiber 150 supplied to the forming device 130 is formed into a rod shape around the mandrel and successively fed, and is withdrawn from the mandrel to form a center hole.
  • the continuous filter having the center hole thus formed is supplied to the subsequent wrapping device 140.
  • the continuous filter supplied to the wrapping device 140 is rolled by rolling paper to form a filter rod, and the filter rod is cut into a predetermined length, thereby manufacturing the center hole filters 42, 43.
  • mainstream smoke generated in the tobacco rod 2 flows into the filter 4 during smoking of the cigarette 1, components of smoke such as tar or nicotine are filtered from the mainstream smoke when the mainstream smoke passes through the filtration material 41 in the filtering section S1.
  • CO contained in the mainstream smoke is a gas phase component and thus not filtered by the filtration material 41. Since the vent hole 31 provided in the chip paper is placed in the filtering section S1 in the filter 4, air introduced through the vent hole 31 is mixed with the mainstream smoke passing through the filtering section S1. This causes dilution of components of the mainstream smoke, and reduces tar, nicotine, CO, or the like contained in the mainstream smoke.
  • the filter 4 has low filtration and high dilution design so that a balance between dilution with air introduced through the vent hole 31 and filtration by the filtration material 41 provides so-called low filtration and high dilution. More specifically, the front section S2 and the mouthpiece end section S3 without a function of filtering the mainstream smoke are placed in a partial zone of the filter 4, thereby achieving low filtration and high dilution.
  • the center hole filters 42,43 having the hollow first center hole 42a and the hollow second center hole 43a, respectively, are provided.
  • a region other than the hollow first center hole 42a is occupied by a compression formed fiber bundle.
  • ventilation resistance of the region occupied by the fiber bundle is extremely larger than ventilation resistance of the first center hole 42a.
  • a region other than the hollow second center hole 43a is occupied by a compression formed fiber bundle.
  • ventilation resistance of the region occupied by the fiber bundle is extremely larger than ventilation resistance of the second center hole 43a.
  • the mainstream smoke having passed through the filtering section S1 successively flows through the first center hole 42a and the second center hole 43a having extremely low ventilation resistance, and is eventually inhaled from the mouthpiece end into the mouth.
  • the filtering section S1 has a function of filtering the components of the mainstream smoke, and the subsequent front section S2 and mouthpiece end section S3 do not have the function of filtering the components of the smoke. This causes a balance between dilution and filtration of the mainstream smoke to be low filtration and high dilution, thereby reducing a ratio of CO to tar. This can increase inhaling satisfaction of the cigarette 1 to improve fragrance inhaling taste thereof.
  • a magnitude relation between the sectional areas of the penetration paths is determined so that the sectional area of the second center hole 43a in the mouthpiece end section S3 is larger than the sectional area of the first center hole 42a in the front section S2.
  • Fig. 4 is a vertical sectional view of a filter 40 according to a comparative example.
  • the filter 40 includes, from a front end side, a filtration material 410 and a center hole filter 430 connected to each other.
  • the filtration material 410 and the center hole filter 430 in the filter 40 are substantially the same as the filtration material 41 and the center hole filter 43 in the filter 4 according to this embodiment.
  • the filter 40 according to the comparative example is substantially the same as a configuration of the filter 4 in Fig. 1 without the front section S2 (center hole filter 42).
  • Fig. 5 conceptually illustrates local tar contamination on a mouthpiece end surface of the filter 40 according to the comparative example.
  • tar easily locally adheres to a periphery (edge) of the center hole 430a on the mouthpiece end surface, and tar contamination on the mouthpiece end surface is easily noticeable.
  • the sectional area of the second center hole 43a in the mouthpiece end section S3 is larger than the sectional area of the first center hole 42a in the front section S2 connected immediately upstream of the mouthpiece end section S3, thereby making local tar contamination at the periphery (edge) of the second center hole 43a on the mouthpiece end surface less noticeable.
  • a channel sectional area of the mainstream smoke increases (first center hole 42a ⁇ second center hole 43a) at a boundary position between the front section S2 and the mouthpiece end section S3 in a deeper position from the mouthpiece end surface. Then, the mainstream smoke flows from the first center hole 42a into the second center hole 43a at the boundary position between the front section S2 and the mouthpiece end section S3 while expanding in a cross sectional direction. This may cause local tar adhesion to the periphery (edge) of the first center hole 42a on the rear end surface of the center hole filter 42.
  • the rear end surface of the center hole filter 42 is placed in a deeper position from the mouthpiece end surface by a length of the mouthpiece end section S3.
  • the tar contamination is less visible from a smoker.
  • the flow velocity (flow rate) of the mainstream smoke flowing on the outer peripheral side of the second center hole 43a is reduced, thereby reducing the frequency of contact between mainstream smoke inhaled from the rear end of the second center hole 43a into the mouth and the mouthpiece end surface.
  • This can prevent local tar adhesion to the periphery (edge) of the second center hole 43a on the mouthpiece end surface.
  • This can prevent tar contamination on the mouthpiece end surface of the filter 4 and make the tar contamination less noticeable.
  • low filtration and high dilution of the filter 4 can be achieved without providing a section such as a cavity or a recess with the entire cross section of the filter 4 being hollow (void). This can prevent insufficient hardness over the entire longitudinal zone of the filter 4. This can prevent inconvenience such as accidental deformation of the filter 4 before or during smoking.
  • the cigarette 1 according to this embodiment can make tar contamination on the mouthpiece end surface of the filter 4 less noticeable, and satisfactorily prevent insufficient hardness of the filter 4.
  • the mouthpiece end section S3 is shorter than the front section S2. Since a thickness (wall thickness) of the center hole filter 43 is smaller than that of the center hole filter 42, the center hole filter 43 being shorter than the front section S2 can more reliably prevent insufficient hardness of the filter 4 from being manifested.
  • the first center hole 42a and the second center hole 43a in the filter 4 are coaxially placed.
  • Such a configuration can more uniformly reduce the frequency of contact between the mainstream smoke flowing out through the second center hole 43a in the mouthpiece end surface and the mouthpiece end surface over the entire periphery of the second center hole 43a. This can more satisfactorily make the tar contamination on the mouthpiece end surface of the filter 4 less noticeable.
  • the filtration material 41 is provided in the filtering section S1 located at the front end of the filter 4, and thus the filtration material 41 can function as shred spilling preventing means for preventing the cut tobacco 21 in the tobacco rod 2 from entering (spilling into) the filter 4.
  • the filtration material 41 in the filtering section S1 also serves as the shred spilling preventing means.
  • the shred spilling preventing means is not limited to the filtration material 41 as long as it has a function of preventing the cut tobacco 21 from entering the filter 4.
  • various configurations such as a metal or resin mesh material may be used as the shred spilling preventing means.
  • the filtration material 4 also serving as the shred spilling preventing means can reduce material cost for the filter 4, and also prevent complication of a manufacturing process.
  • the vent hole 31 in the filter 4 is placed in a position corresponding to the filtering section S1. Using such a configuration allows ventilation air to be smoothly introduced through the vent hole 31 into the filter 4. Also, the vent hole 31 is placed in the filtering section S1. The vent hole 31 is placed upstream of the mouthpiece end section S3 as in this embodiment, and thus a flow of ventilation (dilution) air introduced through the vent hole 31 into the filter 4 allows passage of the mainstream smoke flowing through the first center hole 42a in the front section S2 while being directed toward the central side of the first center hole 42a.
  • the flows can be caused to flow downward. Since the flows of the mainstream smoke and the dilution air are maintained while passing through the second center hole 43a in the mouthpiece end section S3, the frequency of contact between the mainstream smoke inhaled from the rear end of the second center hole 43a into the mouth and the mouthpiece end surface can be more effectively reduced. This can make the tar contamination on the mouthpiece end surface of the filter 4 much less noticeable.
  • the above described operation of "allows passage of the mainstream smoke while being directed toward the central side of the first center hole 42a" can be obtained by placing the vent hole 31 upstream of the mouthpiece end section S3 in the filter 4.
  • the vent hole 31 is, according to the present invention, placed in a position corresponding to the front section S2 as in an exemplified configuration in Fig. 6.
  • Fig. 6 illustrates a position of the vent hole 31 according to the present invention.
  • the vent hole 31 is placed in the position corresponding to the front section S2 in the filter 4.
  • the vent hole 31 extends through the chip paper 3, and also a side wall surrounding the second center hole 43a in the center hole filter 42.
  • the flow of the dilution air introduced through the vent hole 31 in the front section S2 into the second center hole 43a in the center hole filter 42 allows the mainstream smoke to flow while being directed toward the central side of the center hole 42a, and can make the tar contamination on the mouthpiece end surface of the filter 4 less noticeable.
  • the vent hole 31 opens in both the side wall of the center hole filter 42 and the chip paper 3, but may open in the chip paper 3 only. Also in this case, the air having passed through the center hole filter 42 can be introduced into the second center hole 43a.
  • the diameter of the first center hole 42a in the front section S2 is within 26% to 39% of the diameter of the filter 4.
  • the diameter of the first center hole 42a may be 2 mm to 3 mm.
  • the diameter of the first center hole 42a may be 1.3 mm to 2 mm.
  • the diameter of the second center hole 43a in the mouthpiece end section S3 may be more than 39% to not more than 78% of the diameter of the filter 4.
  • the diameter of the second center hole 43a may be more than 3 mm to not more than 6 mm.
  • the diameter of the second center hole 43a may be more than 2 mm to not more than 4.1 mm.
  • the length of the front section S2 in which the center hole filter 42 is placed may be 7 mm or more, and the length of the mouthpiece end section S3 in which the center hole filter 43 is placed may be 5 mm to 10 mm.
  • a ratio of the diameter to the length (diameter/length) of the second center hole 43a in the mouthpiece end section S3 may be 0.3 to 1.2. In terms of making the local tar contamination on the rear end surface of the front section S2 (center hole filter 42) less visible, the ratio of the diameter to the length of the second center hole 43a is preferably 1.2 or less.
  • the sectional shapes of the first center hole 42a in the front section S2 and the second center hole 43a in the mouthpiece end section S3 are not limited to the circular shape, but may be various shapes.
  • the first center hole 42a may be formed so that a diameter of a circumscribed circle the first center hole 42a is 2 mm to 3 mm.
  • the second center hole 43a may be formed so that a diameter of an inscribed circle in the second center hole 43a is more than 3 mm to not more than 6 mm.
  • the filter 4 according to this embodiment can adopt different modifications. Modifications of the filter 4 according to this embodiment will be described below.
  • Fig. 7 is a vertical sectional view of a cigarette 1A according to modification 1, which is not covered by the present invention.
  • a filter 4A included in the cigarette 1A is similar to the filter 4 in Fig. 1 except that a charcoal (activated carbon) filtering section S0 including a charcoal adding filtration material 44 is placed in front of the filtering section S1.
  • the charcoal filtering section S0, the filtering section S1, the front section S2, and the mouthpiece end section S3 are connected in this order from a front end side of the filter 4A.
  • the charcoal adding filtration material 44 provided in the charcoal filtering section S0 is a charcoal filter such that a cellulose acetate fiber bundle to which activated carbon (for example, carbon derived from coconut shell of 20 to 80 mesh) is added is rolled by rolling paper.
  • the charcoal (activated carbon) functions as an adsorbent that adsorbs components of mainstream smoke.
  • the filtration material 41 of cellulose acetate fiber is connected to a rear end of the charcoal adding filtration material 44.
  • the filtration material 41 placed subsequently to the charcoal adding filtration material 44 can function as activated carbon spilling preventing means for preventing the activated carbon added to the charcoal adding filtration material 44 from entering the first center hole 42a in the front section S2 (center hole filter 42).
  • a metal or resin mesh material or the like that functions as the activated carbon spilling preventing means may be placed.
  • the filter 4 in Fig. 1 the example is disclosed in which the front section S2 and the mouthpiece end section S3 are placed as sections without a filtering function.
  • a section without a filtering function, a section having a filtering function, or the like may be provided between the filtering section S1 and the front section S2.
  • the sectional area of the second center hole 43a that is the penetration path in the mouthpiece end section S3 may be larger than the sectional area of the first center hole 42a that is the penetration path in the front section S2 immediately upstream of the mouthpiece end section S3, and different modifications may be used for a configuration upstream of the front section S2 in the filter 4.
  • Fig. 8 is a vertical sectional view of a cigarette 1B according to modification 2, which is not covered by the present invention.
  • a filter 4B included in the cigarette 1B according to modification 2 uses a structure in which center hole sections S4, S5 are additionally placed between the filtering section S1 and the front section S2 in the filter 4 in Fig. 1 .
  • a center hole filter 45 having a third center hole 45a is provided, and in the center hole section S5, a center hole filter 46 having a fourth center hole 46a is provided.
  • the third center hole 45a, the fourth center hole 46a, the first center hole 42a, and the second center hole 43a are coaxially placed.
  • channel sectional areas of mainstream smoke in the center holes increase stepwise in order of the third center hole 45a, the fourth center hole 46a, the first center hole 42a, and the second center hole 43a.
  • the same advantage as of the filter 4 in Fig. 1 that is, the advantage of making tar contamination on the mouthpiece end surface of the filter less noticeable, and preventing insufficient hardness of the filter can be achieved.
  • Fig. 9 is a vertical sectional view of a cigarette 1C according to modification 3, which is not covered by the present invention.
  • a filter 4C included in the cigarette 1C according to modification 3 the center hole sections S4 and S5 in the filter 4B in Fig. 8 change places. Specifically, in the filter 4C, the filtering section S1, the center hole section S5, the center hole section S4, the front section S2, and the mouthpiece end section S3 are connected in this order from the front end side.
  • mainstream smoke having passed through the filtering section S1 flows into the fourth center hole 46a, successively passes through the third center hole 45a, the first center hole 42a, and the second center hole 43a, and is then inhaled by a smoker.
  • the sectional area of the second center hole 43a in the mouthpiece end section S3 is larger than the sectional area of the first center hole 42a in the front section S2 connected immediately upstream of the mouthpiece end section S3. This can make tar contamination on the mouthpiece end surface of the filter less noticeable, and prevent insufficient hardness of the filter similarly to the filter 4 in Fig. 1 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
EP14899311.6A 2014-08-07 2014-08-07 Cigarette with filter Active EP3178333B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/070879 WO2016021021A1 (ja) 2014-08-07 2014-08-07 フィルター付きシガレット

Publications (3)

Publication Number Publication Date
EP3178333A1 EP3178333A1 (en) 2017-06-14
EP3178333A4 EP3178333A4 (en) 2018-02-14
EP3178333B1 true EP3178333B1 (en) 2021-05-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14899311.6A Active EP3178333B1 (en) 2014-08-07 2014-08-07 Cigarette with filter

Country Status (7)

Country Link
EP (1) EP3178333B1 (zh)
JP (1) JP6218948B2 (zh)
KR (2) KR102121894B1 (zh)
CN (1) CN106572698B (zh)
RU (1) RU2663381C1 (zh)
TW (1) TWI576054B (zh)
WO (1) WO2016021021A1 (zh)

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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
CN107594619B (zh) * 2017-09-22 2023-09-15 河南中烟工业有限责任公司 一种双重过滤滤嘴结构及卷烟
GB201715924D0 (en) * 2017-09-29 2017-11-15 British American Tobacco Investments Ltd A filter unit for a smoking article
KR102343349B1 (ko) * 2018-03-29 2021-12-24 주식회사 케이티앤지 적어도 하나의 천공을 포함하는 에어로졸 발생 물품
EP4183271A1 (en) * 2018-10-05 2023-05-24 Japan Tobacco Inc. Smoking article
WO2020098320A1 (zh) * 2018-11-14 2020-05-22 云南中烟工业有限责任公司 一种用于周向加热不燃烧卷烟的烟支
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CN106572698A (zh) 2017-04-19
TWI576054B (zh) 2017-04-01
KR20170041797A (ko) 2017-04-17
EP3178333A4 (en) 2018-02-14
KR20190104635A (ko) 2019-09-10
TW201605360A (zh) 2016-02-16
CN106572698B (zh) 2020-09-04
EP3178333A1 (en) 2017-06-14
KR102121894B1 (ko) 2020-06-11
JPWO2016021021A1 (ja) 2017-04-27
JP6218948B2 (ja) 2017-10-25
WO2016021021A1 (ja) 2016-02-11

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