WO2018054996A1 - Filtre à structures pénétrantes destiné à un article à fumer - Google Patents

Filtre à structures pénétrantes destiné à un article à fumer Download PDF

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Publication number
WO2018054996A1
WO2018054996A1 PCT/EP2017/073816 EP2017073816W WO2018054996A1 WO 2018054996 A1 WO2018054996 A1 WO 2018054996A1 EP 2017073816 W EP2017073816 W EP 2017073816W WO 2018054996 A1 WO2018054996 A1 WO 2018054996A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
wrapper
line
intruding
bend
Prior art date
Application number
PCT/EP2017/073816
Other languages
English (en)
Inventor
Valerio D'AMBROGI
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 WO2018054996A1 publication Critical patent/WO2018054996A1/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
    • 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
    • A24D1/02—Cigars; Cigarettes with special covers
    • 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
    • A24D3/025—Final operations, i.e. after the filter rod forming process

Definitions

  • the present invention relates to filters with intruding structures for smoking articles and to smoking articles comprising these filters with intruding structures. Further, the invention relates to a method for the production of filters with intruding structures.
  • Filters for smoking articles are well-known in the art.
  • Standard filters for smoking articles are filter rods made of filter material such as cellulose acetate tow which is circumscribed by a wrapper.
  • Filters with perforations are known from international patent application WO2012/066393A1 .
  • the perforations are introduced into the wrapper in order to facilitate the disintegration of the wrapper upon disposal in the environment.
  • US patent US 4,476,882 and German patent DE 2940293 C2 are directed to filters with perforations and grooves.
  • the grooves are introduced into the filters in order to modify the filtering characteristics.
  • the grooves also reduce the resistance to draw.
  • UK patent application GB 2 147 491 A relates to the manufacture of ventilated cigarettes.
  • the cigarettes are perforated by a method comprising rolling the cigarettes with respect to a set of pins and exciting the pins to promote their penetration through the wrappers of the cigarettes.
  • the cigarette wrapper may partially shear so as to form one or more tabs around the aperture which are pushed into the cigarette. These tabs are randomly created and are thus not predetermined in their shapes and sizes.
  • filter tow material used per filter plug may be reduced.
  • Conventional filter plugs may be made for example from 5.5Y35K cellulose acetate tow. It is possible to substitute this standard filter material by cellulose acetate tow with lower filament denier, which is known to have a higher filtering efficiency. In this way, the total amount of filter material present in a filter, which may be expressed in terms of the total denier, can be reduced. At the same time, the same overall filtering capacity of the filter is maintained.
  • a filter plug made from 2.7Y23K cellulose acetate tow has a similar filtering efficiency as a conventional filter plug, but requires less total amount of filter tow material.
  • a reduction in the total denier of a filter also reduces the resistance to draw of the filter.
  • a filter with reduced total denier that is a reduced total amount of filter material, will not meet the expected resistance to draw when included in a smoking article.
  • a filter for smoking articles comprising filter material, and a wrapper circumscribing the filter material thereby forming a filter rod.
  • the wrapper comprises a plurality of intruding structures, wherein each intruding structure comprises at least one bend-line and at least one cut-line.
  • each intruding structure comprises a flap of the wrapper which is bent or folded along the at least one bend-line in a direction toward the inside of the filter.
  • the shape of the flap is predetermined by the arrangement of the at least one cut-line.
  • a direction toward the inside of the filter means any direction pointing from a point on the lateral surface of the filter toward a point within the inner volume of the filter.
  • each intruding structure in accordance to the invention includes at least one bend-line which is associated to at least one cut-line.
  • the intruding structures of the invention advantageously increase the resistance to draw of a filter when included in a smoking article.
  • the invention provides a filter design which allows using a reduced amount of filter material. Additionally, the resistance to draw of such a filter when included in a smoking article can be substantially maintained.
  • the intruding structures of the present invention manage to reach an increased structural depth compared to the prior art grooves.
  • bend-line is used to refer to a line on the wrapper, which indicates the border between a flap of the wrapper which is bent or folded along the bend-line in a direction toward the inside of the filter and a portion of the wrapper which is not bent or folded inwardly.
  • the end points of the bend-lines coincide with end points of a single cut-line or the end points of two cut-lines in the wrapper.
  • bend- lines are substantially linear, continuous and straight when the wrapper is in a planar configuration. However, in some embodiments it may be advantageous that bend-lines are curved when the wrapper is in a planar configuration.
  • Curved bend-lines may increase the resistance for the intruding structure to return into the original position by forcing the intruding structure into a second bi-stable position.
  • bend-lines are linear.
  • Bend-lines may be imaginary lines that are not physically present on the wrapper without bending or folding a flap of the wrapper along the bend-line in a direction toward the inside of the filter.
  • Bend-lines may also be folding lines. Folding lines are real lines that are physically present on the wrapper without bending or folding a flap of the wrapper along the folding line in a direction toward the inside of the filter. Folding lines comprise additional features that are provided to the wrapper along at least a part of a folding line. Examples for such additional features comprise scores, creases, embossments, and perforations. Generally, the folding lines in accordance to the invention may be of any type of folding line commonly known in the packaging industry. Preferably, bend-lines are folding lines. Throughout the specification, the term "cut-line" is used to refer to a line, along which there is a cut extending through the wrapper material. Cut-lines may be linear, or may be of any suitable curved or angled shape. However, the shape of the cut-line is substantially predetermined and controlled. Thus, the shape of a cut-line is not randomly created. Instead, the shape of the cut-line is reproducibly created by the cutting process.
  • the shape of the flap is predetermined by the arrangement of the at least one cut-line.
  • the arrangement of the at least one cut-line corresponds to the shape of the cut-line in case there is only one single cut-line present in an intruding structure.
  • the arrangement of the at least one cut-line corresponds to the shape of the cut-lines and to the relative positions and orientations of the cut-lines on the wrapper, in case there is more than one cut-line present in an intruding structure.
  • the protrusion created by the flap of the wrapper which is bent or folded in a direction toward the inside of the filter impacts the flow characteristics of the smoke within the filter.
  • the extent of this effect depends on various factors like shape, penetration depth and arrangement of the intruding structures. It was found that the so modified filters exhibit enhanced resistance to draw values per mass of applied filter material. Thereby, the amount of filter material in a filter can be reduced while maintaining the desired resistance to draw of a standard filter when included in a smoking article.
  • the filters with intruding structures in accordance to the invention may also effect the filtering efficiency of a given filter material due to the unique geometry and flow characteristics within the filter. This may result in a further enhanced filtering efficiency.
  • the filters with intruding structures of the present invention it is possible to reduce the amount of filter material in the filter. Further, by using the filters with intruding structures of the present invention it is possible to substantially maintain the filtering capacity and resistance to draw of conventionally used filter plugs.
  • the present invention allows reducing the filter material required per filter plug without altering the filter performance. Further, the present invention enables the cost efficient production of filters for smoking articles. Also, the present invention advantageously allows the reduction of waste by reducing the amount of filter material.
  • an intruding structure may consist of a bend-line, and a U- or V- shaped cut-line linking the ends of the bend-line. The flap of the wrapper enclosed by the bend-line and the cut-line is then folded or bent along the bend-line.
  • each intruding structure comprises at least one of a V-shaped cut-line, a U-shaped cut-line, a circular cut-line, an oval cut-line, a star shaped cut-line, or combinations thereof.
  • the terms “circular” and “oval” refer to closed circles or ovals respectively, as well as parts of circles or ovals, respectively.
  • star shaped refers to a closed line comprising a plurality of regularly or irregularly formed spikes.
  • closed line refers to a line whose starting point is identical to its end point.
  • a triangular flap of the wrapper is bent or folded in a direction toward the inside of the filter.
  • the bend-line is a folding line.
  • the triangular flap has the shape of an equilateral triangle.
  • the triangular flap is bent or folded in a direction toward the inside of the filter by an angle of between about 50 degrees and about 90 degrees, preferably between about 60 degrees and about 80 degrees, and more preferably of about 70 degrees. It has been found that triangular flaps exhibit a particularly high structural strength.
  • the shape of the flap does not only affect the stability of the flap, but also influences the effect the intruding structure has on the resistance to draw of the filter.
  • the opening angle of the flap is the angle between the direction in which the flap is bent or folded toward the inside of the filter and the direction parallel to the longitudinal axis of the filter.
  • the effective area can be described as the portion of the total cross-sectional area of the filter which is blocked for the main stream smoke to pass by unhindered by the intruding flap. In other words, the effective area is the projection of the area of the flap on a plane orthogonal to the longitudinal direction of the filter. The larger the effective area is, the stronger is the effect of the intruding structure on the resistance to draw of the filter.
  • an opening angle of between about 30 degrees and about 150 degrees is preferred. More preferably the opening angle is between about 60 degrees and about 120 degrees, and more preferably the opening angle is about 70 degrees.
  • the rotational orientation of the flap relative to the longitudinal direction of the filter that is the direction of the main stream smoke has to be taken into account. If for example, the flap is oriented substantially parallel to the direction of the main stream smoke, then the effective area of the flap that disturbs the flow of the mainstream smoke is near zero, independent of the opening angle of the flap.
  • the effective area of the flap that disturbs the flow of the mainstream smoke is maximized.
  • the flaps according to the invention may have any rotational orientation relative to the longitudinal direction of the filter.
  • the flap is oriented substantially orthogonal to the direction of the main stream smoke, more preferably the flap is oriented orthogonal to the direction of the main stream smoke.
  • each intruding structure comprises at least 3 bend-lines which define the edges of a polygon.
  • the polygon may be any type of regular or irregular polygon.
  • the polygon may be an isosceles, an equilateral or an asymmetric triangle.
  • Each bend-line is associated to at least one cut-line at its ends thereof, and each bend-line together with its at least one associated cut-line forms a flap of the wrapper which is bent or folded along the bend-line in a direction toward the inside of the filter.
  • each intruding structure comprises at least 3 bend-lines which define the edges of a regular polygon.
  • Each bend-line is associated to a V-shaped cut- line connecting the end points of the bend-line.
  • Each bend-line together with its associated cut-line forms an isosceles triangle of a flap of the wrapper which is bent or folded along the bend-line in a direction toward the inside of the filter.
  • the intruding structure may comprise 3 bend-lines that form a hole in shape of an equilateral triangle in the wrapper. Further, 3 identical flaps of the wrapper which are bent or folded in a direction toward the inside of the filter, each in shape of an isosceles triangle, are connected to the bend-lines. The sum of the areas of the 3 triangles corresponds to the area of the hole in the wrapper. Preferably, substantially no material is removed from the wrapper through the application of the cut-lines. This advantageously avoids generation of waste.
  • At least a part of the intruding structures is distributed over the wrapper in form of a regular pattern.
  • at least a part of the intruding structures is distributed substantially equidistantly over the wrapper. More preferably, at least a part of the intruding structures is distributed equidistantly over the wrapper.
  • the intruding structures may have regular, preferably identical, shapes, regular, preferably identical, sizes, and may have regular, preferably identical, rotational orientations on the wrapper.
  • regular patterns of the intruding structures on the wrapper may comprise one or more selected from the group of: two or more different nearest neighbour distances between the intruding structures on the wrapper, two or more different shapes of the intruding structures, two or more different sizes of the intruding structures, and two or more different rotational orientations of the intruding structures on the wrapper.
  • the intruding structures are distributed randomly on the wrapper.
  • the intruding structures may have random shapes, may have random sizes, and may have random rotational orientations on the wrapper.
  • the flap of the wrapper which is bent or folded along the at least one bend-line in a direction toward the inside of the filter protrudes between about 0.1 millimeter and about 3 millimeters, preferably between about 0.2 millimeter and about 1 millimeter, and more preferably about 0.5 millimeter in a direction toward the inside of the filter.
  • the area of the flap of the wrapper which is bent or folded along the at least one bend-line in a direction toward the inside of the filter for each particular intruding structure is between about 0.1 and about 4 square millimeters, preferably between about 1 and about 3 square millimeters, and more preferably between about 1 .5 and about 2.5 square millimeters.
  • the total number of intruding structures is between about 10 and about 1 ⁇ 00 per 3 square centimeters of wrapper area, preferably between about 50 and about 500 per 3 square centimeters of wrapper area, and more preferably between about 130 and about 450 per 3 square centimeters of wrapper area.
  • the resistance to draw of the filter is between about 40 and about 150 millimeters Water Gauge, preferably between about 50 and about 1 10 millimeters Water Gauge, and more preferably between about 60 and about 90 millimeters Water Gauge.
  • the filter material may comprise any suitable filter material for filters for smoking articles.
  • the filter material may also comprise additives such as flavouring granules, threads or capsules.
  • the filter material comprises one or more components selected from the group of cellulosic material, paper, cellulose acetate, polylactic acid, activated charcoal, staple fibres, cellular plastics material, and plastics comprising high- density polyethylene - fibres or filaments.
  • the filter material comprises one or more components selected from the group of cellulose acetate, and polylactic acid.
  • the filter material comprises cellulose acetate tow.
  • the filter material substantially only consists of cellulose acetate tow.
  • the filament denier of the filter material is between about 1 and about 6, preferably between about 2 and about 3, and more preferably is about 2.1 .
  • the total denier of the filter material is between about 4 ⁇ 00 and about 42 ⁇ 00, preferably between about 19 ⁇ 00 and about 27 ⁇ 00, and more preferably is about 23 ⁇ 00.
  • the filament denier is about 2.1 and the total denier of the filter material is between about 4 ⁇ 00 and about 42 ⁇ 00, preferably between about 19 ⁇ 00 and about 27 ⁇ 00, and more preferably is about 23 ⁇ 00.
  • the filter material is 2.7Y23K cellulose acetate tow.
  • the wrapper is made of an air permeable material, preferably a cellulose-based paper, and optionally the material is a coloured, printed, or pigmented material.
  • the wrapper is made of an air impermeable material, preferably plastic or cellophane, and optionally the material is a coloured, printed, or pigmented material.
  • the invention provides a smoking article comprising a tobacco rod, a filter in accordance to any one of the embodiments described above, and a tipping material attaching the tobacco rod to the filter.
  • the tipping material may be at least partly perforated or it may be unperforated.
  • the intruding structures are covered by an unperforated tipping material.
  • At least part of the intruding structures may be uncovered, or covered by transparent or opaque material.
  • a material allows a consumer to see at least part of the intruding structures of the filter of the smoking article.
  • the invention provides a method of making filters for smoking articles.
  • the method comprises steps of providing a filter material, providing a wrapper, circumscribing the filter material with the wrapper, thereby forming a filter rod, and providing a plurality of intruding structures to the wrapper.
  • Each intruding structure comprises at least one bend-line and at least one cut-line.
  • Each intruding structure further comprises a flap of the wrapper which is bent or folded along the at least one bend-line in a direction toward the inside of the filter. The shape of the flap is predetermined by the arrangement of the at least one cut-line.
  • the intruding structures are provided to the wrapper before the step of circumscribing the filter material with the wrapper.
  • the intruding structures may be provided to the wrapper after the step of circumscribing the filter material with the wrapper. Providing the intruding structures to the wrapper before the step of circumscribing the filter material with the wrapper is technically less complicated since the intruding structures can be provided to a plain sheet of wrapper instead of being provided to a cylindrically shaped wrapper.
  • a benefit of providing the intruding structures to the wrapper after the step of circumscribing the filter material with the wrapper is that there is no risk of altering the intruding structures during the step of circumscribing the filter material with the wrapper, for example against the physical resistance of the present filter material.
  • the step of providing a plurality of intruding structures to the wrapper comprises cutting for each perforation at least one cut-line into the wrapper and, then, bending or folding a flap of the wrapper along at least one bend-line in a direction toward the inside of the filter.
  • the wrapper is provided with one or more items selected from the group of cuts, perforations, embossments, scores, and creases in a first step in order to predetermine at least part of the cut-lines and, optionally, also to predetermine at least part of the bend-lines of the intruding structures.
  • the intruding structures are then finally provided in a second step.
  • the second step is performed after the first step. Both steps may be independently performed either before or after the step of circumscribing the filter material with the wrapper.
  • the step of the method according to the invention of providing a plurality of intruding structures to the wrapper comprises rotating the filter rod and sequentially introducing the intruding structures into different sections of the wrapper.
  • the step of the method according to the invention of providing a plurality of intruding structures to the wrapper may comprise applying pressurized air to the wrapper or poking the wrapper with a pinned tool.
  • Fig. 1 shows an embodiment of a filter of the invention
  • Fig. 2 is an illustrative diagram showing the relationship between tow weight and resistance to draw for standard filters and for filters of the invention
  • Fig. 3 shows a detailed view of an intruding structure of an embodiment of the invention
  • Fig. 4 shows a detailed view of an intruding structure of another embodiment of the invention.
  • Fig. 5 shows a multi-length filter rod provided with intruding structures.
  • Fig. 1 shows an embodiment of a filter 10 with intruding structures 30 in accordance to the invention. Shown is a wrapper 20 which circumscribes the filter material thereby forming a filter rod. Accordingly, the wrapper 20 forms the lateral surface of a cylinder around the filter material (not shown in fig. 1 ). The main stream smoke is guided along a longitudinal direction through the cylinder.
  • the wrapper 20 comprises several holes 32 in the shape of triangles. Each of the triangles is bordered by two linear cut-lines 34 and one linear bend-line 36.
  • a triangular flap 38 of the wrapper 20 is bent or folded along each bend-line 36 in a direction toward the inside of the filter 10, that is a direction pointing from a point on the lateral surface of the cylinder toward a point within the inner volume of the cylinder.
  • the triangular shape of the flap 38 is predetermined by the arrangement of the two cut-lines 34.
  • the intruding structures 30 all are identical in shape and size and are regularly distributed over the wrapper 20. Moreover, all of the intruding structures 30 have the same rotational orientation on the wrapper 20.
  • Fig. 2 shows a qualitative diagram which illustrates the effect which the intruding structures 30 of the invention have on the characteristics of filters when included in a smoking article.
  • the resistance to draw 40 is sketched.
  • the resistance to draw 40 increases in direction of the arrow.
  • the mass of filter material per filter 42 which corresponds to the tow weight of the filter is sketched.
  • the mass of filter material per filter 42 increases in direction of the arrow.
  • the resistance to draw 40 of two filter elements typically increases with the mass of filter material per filter 42.
  • the solid line 44 shows the behaviour of a standard filter.
  • the dotted line 46 corresponds to a filter with intruding structures 30 in accordance to the invention.
  • FIG. 2 shows how the behaviour of the filter shifts towards higher resistance to draw 40 at lower mass of filter material per filter 42 when the intruding structures 30 are introduced in a filter.
  • the horizontal double arrowed line 48 marks the resulting saving in filter material at constant resistance to draw 40. Accordingly, a filter design which allows using a reduced amount of filter material is provided. Further, at the same time, the resistance to draw 40 of such a filter is substantially maintained.
  • Fig. 3 is a detailed view of an intruding structure 30 according to a preferred embodiment of the invention.
  • the intruding structure 30 comprises a hole 32 in the wrapper 20 which has the shape of an equilateral triangle.
  • the hole 32 is bordered by two linear cut- lines 34, corresponding to one V shaped cut-line 34, and one bend-line 36.
  • a flap 38 of the wrapper 20 in the shape of an equilateral triangle is bent or folded in a direction toward the inside of the filter 10.
  • the triangular shape of the flap 38 is predetermined by the arrangement of the V shaped cut-line 34.
  • Fig. 4 is a detailed view of an intruding structure 30 according to another preferred embodiment of the invention.
  • the intruding structure 30 comprises a hole 32 in the wrapper 20 in shape of an equilateral triangle which is bordered by three bend-lines 36. Along each of the bend-lines 36 a flap 38 of the wrapper 20 in the shape of an isosceles triangle is bent or folded in a direction toward the inside of the filter 10. Hence, a symmetrical intruding structure 30 is provided.
  • Fig. 5 is a drawing of a multi-length filter rod 50 produced by the method of making filters for smoking articles of the invention. It is well-known in the art to produce filters in multi-length filter rods which are then cut into multiple, smaller filters, for example 4 smaller filters, each corresponding to the filter 10 in a single smoking article.
  • Fig. 5 shows a side view of a multi-length filter rod 50 comprising a row of four individual filters 10 as to be separated along the vertical separation lines 52. Each filter 10 has a length of about 27 millimeters.
  • the intruding structures 30 are regularly distributed along the filters 10.
  • the free area 54 may, for example, define the mouth end side of each filter 10. Accordingly, neighbouring filters 10 in the row are oriented in opposite directions. This allows cutting double-length filter rods from the multi- length filter rod 50. Double-length filter rods are commonly used for the production of smoking articles. These double-length filter rods are combined with tobacco rods at each end thereof and are then divided into two individual smoking articles.

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

Abstract

La présente invention concerne un filtre (10) à structures pénétrantes (30) destiné à des articles à fumer. Le filtre (10) de l'invention comprend un matériau de filtre et une enveloppe (20) entourant le matériau de filtre formant ainsi une tige de filtre. L'enveloppe (20) comprend une pluralité de structures pénétrantes (30), chaque structure pénétrante comportant au moins une ligne de pliage et au moins une ligne de découpe, chaque structure pénétrante (30) comprenant un rabat (38) de l'enveloppe (20) qui est recourbé ou plié dans une direction vers l'intérieur du filtre (10), la forme du rabat étant prédéterminée par l'agencement de l'au moins une ligne de découpe. La présente invention concerne également des articles à fumer comprenant des filtres (10) à structures pénétrantes (30), ainsi qu'un procédé de fabrication de filtres (10) destinés à des articles à fumer.
PCT/EP2017/073816 2016-09-23 2017-09-20 Filtre à structures pénétrantes destiné à un article à fumer WO2018054996A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16190305 2016-09-23
EP16190305.9 2016-09-23

Publications (1)

Publication Number Publication Date
WO2018054996A1 true WO2018054996A1 (fr) 2018-03-29

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4476882A (en) 1983-02-07 1984-10-16 Brown & Williamson Tobacco Corporation Tobacco smoke filters
GB2147491A (en) 1983-09-30 1985-05-15 Molins Plc Manufacture of ventilated cigarettes
DE2940293C2 (de) 1977-08-19 1985-05-23 Liggett Group Inc., Montvale, N.J. Filter für Rauchartikel sowie Verfahren und Vorrichtung zur Herstellung
US4541825A (en) * 1982-12-27 1985-09-17 Celanese Corporation Low air pressure method and apparatus for forming filter rods
US5365951A (en) * 1990-08-24 1994-11-22 Philip Morris Incorporated Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core
WO2011038430A1 (fr) * 2009-09-30 2011-04-07 Tannpapier Gmbh Procédé de production d'un revêtement d'embout d'une cigarette
EP2324722A1 (fr) * 2009-11-23 2011-05-25 Philip Morris Products S.A. Nouveau segment de filtre comprenant un substrat chargé d'un agent de modification de la fumée
WO2012066393A1 (fr) 2010-03-26 2012-05-24 Philip Morris Products S.A. Papiers pour filtres désintégrables et leurs applications

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940293C2 (de) 1977-08-19 1985-05-23 Liggett Group Inc., Montvale, N.J. Filter für Rauchartikel sowie Verfahren und Vorrichtung zur Herstellung
US4541825A (en) * 1982-12-27 1985-09-17 Celanese Corporation Low air pressure method and apparatus for forming filter rods
US4476882A (en) 1983-02-07 1984-10-16 Brown & Williamson Tobacco Corporation Tobacco smoke filters
GB2147491A (en) 1983-09-30 1985-05-15 Molins Plc Manufacture of ventilated cigarettes
US5365951A (en) * 1990-08-24 1994-11-22 Philip Morris Incorporated Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core
WO2011038430A1 (fr) * 2009-09-30 2011-04-07 Tannpapier Gmbh Procédé de production d'un revêtement d'embout d'une cigarette
EP2324722A1 (fr) * 2009-11-23 2011-05-25 Philip Morris Products S.A. Nouveau segment de filtre comprenant un substrat chargé d'un agent de modification de la fumée
WO2012066393A1 (fr) 2010-03-26 2012-05-24 Philip Morris Products S.A. Papiers pour filtres désintégrables et leurs applications

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