EP0875160B1 - Ventilated filter cigarette with a coaxial filterelement - Google Patents

Description

The invention relates to a ventilated filter cigarette of the type described in the preamble of claim 1 is described.

Ventilated filter cigarettes are known, see e.g. GB2119221 A. Such cigarettes have a ventilation zone on the filter, through which air is sucked in when pulling on the cigarette can be. The ventilation zone can be perforated, for example Filter wrapping using laser beams, but also in various other ways getting produced. The ventilation of the filter opens up the possibility of influencing the taste and can also help with modified cigarettes Adjust nicotine and condensate levels.

When smoking with the ventilation zone closed, the smoke yield increases clearly.

It is the object of the present invention to provide a ventilated filter cigarette create, in which the above disadvantage does not occur. In particular, a less increase in smoke yield when smoking with closed Ventilation zone can be reached. This task is accomplished through a ventilated filter cigarette solved that designed according to the characterizing part of claim 1 is.

The advantage of the filter cigarette according to the invention is in particular that when smoking the cigarette with the ventilation zone closed, the smoke yield increases significantly less than in ventilated not according to the invention Filter cigarettes. The design of the material specifications and the dimensioning the individual elements of the tobacco rod and the filter act in the manner a changeover valve. When the ventilation openings are open, the Smoke essentially through the filter core of the coaxial filter element, while flow guidance automatically when the ventilation openings are covered is present, in which a significant proportion of the cigarette smoke also contains the filter jacket flows through. A cigarette according to the present invention increases For example, the condensate value when covering the ventilation openings only around about half the value of the increase in conventional filter cigarettes.

There are several ways to filter a cigarette's ventilated filter to design according to the present invention. The filter can be a monofilter consisting of a single coaxial segment, but also a filter with several Be longitudinal segments, at least one of which is a coaxial segment. The Ventilation zone is on the coaxial segment.

In one embodiment of the cigarette according to the invention, the filter has two Longitudinal segments, the string-side filter segment being a standard filter segment and the adjoining mouth-side segment is a coaxial filter segment is.

In another embodiment of the present invention, the filter has three Longitudinal segments, the filter element on the strand side being a conventional standard filter segment, the adjoining middle filter segment is a chamber with a selectively filtering material and the filter segment connected to it is a coaxial filter segment. The installation of an additional segment as a chamber with selectively filtering material allows an advantageous adjustment of the composition of smoke.

A fourth filter design option is a filter with three To provide longitudinal segments, the strand-side filter element first common standard filter segment, the adjoining middle filter segment a coaxial filter element and the filter segment connected to it is a second common standard filter segment or a hollow mouthpiece.

All four possible filter configurations mentioned above represent the above beneficial effects in covering the ventilation openings.

According to one embodiment of the filter cigarette according to the present invention this is characterized in that the sheathing of the coaxial filter element Filter core is substantially impermeable to air, and preferably made of cellulose acetate or paper, the diameter of the filter core is dimensioned so that the ratio of the core cross-sectional area to the cross-sectional area of the jacket is significantly less than 1, the ratio of the tensile resistances of the filter jacket to Filter core is greater than 0.5, preferably 0.8 to 1.5, the specific tensile resistance of the filter core is 0.3 to 0.75, preferably 0.5, the ratio of the distance the ventilation zone from the mouth end of the coaxial filter element to Length of the coaxial filter element is greater than 0.8, preferably 0.87 to 0.93, and the ventilation zone lies on the coaxial filter element, with the tobacco rod The condensate yield is below 25 mg, preferably below 20 mg, and the tensile resistance of the tobacco rod is below 60 mmWS, preferably below 50 mmWS.

The diameter of the filter of the ventilated filter cigarettes according to an advantageous embodiment of the present Invention is between 7.7 and 8.0 mm.

According to an advantageous embodiment of a ventilated filter cigarette according to the The present invention, in which the strand-side filter segment made of cellulose acetate there is a low single titer, preferably 2.1 dpf and lower, and has a draw resistance that is less than 60 mmWS, preferably 35 to 50 mmWS.

In a further embodiment of a ventilated filter cigarette according to the invention, in which the mouth-side filter segment consists of cellulose acetate has this a high single titer, preferably 8 dpf, and a draw resistance that is lower is as 20 mmWS, preferably 10 mmWS.

This mouth-side filter segment can also be a hollow mouthpiece.

The various filter versions mentioned above for a ventilated filter cigarette according to the invention are listed again in Table 1 below: Version no. Segment 1 Segment 2 Segment 3 1 standard filter coaxial filter - 2 coaxial filter - - 3 standard filter Chamber with selective filtering material coaxial filter 4 standard filter coaxial filter standard filter (The segment numbering starts on the tobacco side).

Other possible versions are combinations of versions 2 and 3 with one additional mouth-side standard segment or a hollow mouthpiece. It can in further versions the mouth or tobacco standard segments also fiber filters with selective interferences such as activated carbon filters. Instead of the standard segments, specially shaped filter segments such as e.g. SCS filters from Filtrona can be used.

The materials for the filter core and the filter jacket of the coaxial filter elements can comprise all known filter materials, but preferably cellulose acetate used. The data for the specific train resistance concern a tensile resistance, measured at 17.5 ml / s per unit length by unit area.

The length of the coaxial filter element is determined by the maximum predetermined length of the overall filter. The specification for this length can be made from technical or other reasons. The ventilation openings in an area that is at least 11 mm from the mouth end and lies on the filter in the coaxial segment. The minimum length of the Coaxial segments for versions 1 and 3 12 mm. The materials for the Strand of tobacco are tobacco materials and / or other thermally decomposable materials. The tobacco rod can be a standard tobacco rod or a coaxial rod.

Examples of the low increase in the smoke yield of the cigarettes according to the invention when the ventilation zone is covered compared to conventional cigarettes are shown in Table 2 below. Increase in the amount of condensate when the ventilation zone is covered: ISO condensate value (PMWNF) with conventional cigarettes in cigarettes according to the invention 10 mg 2-3 mg 1 mg 7 mg 3-4 mg 1 - 2 mg 5 mg 4 - 6 mg 2-3 mg

It turns out that in the case of cigarettes according to the invention only half (or less) the increase in the amount of condensate can be observed, that of conventional ventilated filter cigarettes occurs.

The condensate values are given as PMWNF. (PMWNF = particulate matter water nicotine free = condensate).

Figur 1

eine schematische Querschnittsansicht einer Ausführungsform der erfindungsgemäßen ventilierten Filtercigarette; und

Figur 2

eine schematische Schnittansicht einer anderen Ausführungsform einer erfindungsgemäßen ventilierten Filtercigarette.

The invention is explained in more detail below on the basis of two exemplary embodiments with the aid of the accompanying drawings. Show it:

Figure 1

a schematic cross-sectional view of an embodiment of the ventilated filter cigarette according to the invention; and

Figure 2

is a schematic sectional view of another embodiment of a ventilated filter cigarette according to the invention.

FIG. 1 shows a ventilated filter cigarette according to the invention in one embodiment with a coaxial monofilter. It is therefore a Cigarette according to version no. 2 according to table 1. The filter cigarette 10 according to Figure 1 has a tobacco rod 11 to which a coaxial filter 12 is attached. The coaxial filter 12 has a filter core 14 and a filter jacket 13, the casing the filter core 14 is essentially impermeable to air. By the dotted Line ventilation openings 15 are shown, for example, by laser perforation can be introduced.

The cigarette of Figure 1 has the following specifications:

Example 1: Tobacco strand (11):

Condensate yield (PMWNF):

19 mg

Strangzugwiderstand:

50 mmWS

Filter:

Type: coaxial monofilter (12)

Materials: cellulose acetate

Length 27 mm

Position of the ventilation zone (15): 25 mm from the mouth end

Outside diameter: 7.85 mm

Inner diameter: 3.4 mm

Draw resistance of the filter jacket (13): 140 mmWS

Individual titer of the material of the filter jacket (13): 3Y

Draw resistance of the filter core (14): 140 mmWS

Individual titer of the material of the inner segment of the filter core (14): 8Y

Degree of ventilation: 50%

The condensate yield of the ventilated filter cigarette 10 is approximately 10 mg. Becomes the ventilation zone 15 covered, there is only a slight increase in the Condensate yield by up to 1 mg.

FIG. 2 shows a further embodiment of the ventilated according to the invention Filter cigarette with a filter with two longitudinal segments. So here is one Cigarette according to version 1 shown in table 1.

The filter cigarette 20 has a tobacco rod 21 and a filter 22. The filter is divided in two in length. It consists of a coaxial filter segment with Filter core 24 and filter jacket 23 and one between coaxial filter segment 23, 24 and tobacco rod 21 located standard filter segment 26. The ventilation openings 25 are in the vicinity of the tobacco-side end of the coaxial segment 23, 24 indicated by a dotted line.

The cigarette of Figure 2 has the following specifications:

Example 2: Tobacco strand (20):

Condensate yield (PMWNF):

19 mg

Strangzugwiderstand:

45 mmWS

Filter (22):

Type: Dual filter with mouth-side coaxial segment (23, 24)

Length: 27 mm

Materials: cellulose acetate

Mouth-side element (23, 24):

Type: coaxial

Length: 21 mm

Outside diameter: 7.8 mm

Inner diameter: 3.4 mm

Position of the ventilation zone (25): 19 mm from the mouth end

Draw resistance of the filter jacket (23): 110 mmWS

Individual titer of the material of the filter jacket (23): 3Y

Draw resistance of the filter core (24): 110 mmWS

Individual titer of the material of the filter core (24): 8Y

Degree of ventilation: 50%

Tobacco side segment (26):

Type: conventional

Length: 6 mm

Draw resistance: 35 mmWS

Individual titer: 2.1Y

The condensate yield of the ventilated filter cigarette 20 is approximately 7 mg. Will the Ventilation zone 25 covered, so there is only a slight increase in Condensate yield by up to 2 mg.

Claims (9)

1. A ventilated filter cigarette (10, 20), comprising:

   a) a tobacco rod (11, 21);

   b) a wrapping for said tobacco rod (11, 21);

   c) a filter (12, 22) ventilated via ventilation openings (15, 25) and having a co-axial filter element (13, 14; 23, 24) comprising a filter core (14), a wrapping for the filter core (14), a filter jacket (13, 23) and a wrapping for the filter jacket (13, 23);
   wherein the smoke flows substantially through the filter core when the ventilation zone is open,
   characterised in that:

   d) the ratio of the resistance to draw of the filter jacket (13, 23) to the filter core (14, 24) is greater than 0.5, preferably 0.8 to 1.5;

   e) the specific resistance to draw of the filter core (14, 24) is 0.3 to 0.75, preferably 0.5 mmWS (water column) × cm;

   f) the ratio of the distance between the ventilation zone (15, 25) and the end of the co-axial filter element on the mouth side to the length of the co-axial filter element is greater than 0.8, preferably 0.87 to 0.93; and in that:

   g) the ventilation zone lies on the co-axial filter element,

   wherein a substantial proportion of the cigarette smoke flows through the filter jacket (13, 23) of the co-axial filter element (13, 14; 23, 24) when the ventilation openings (15, 25) are covered.
2. The ventilated filter cigarette (20) as set forth in claim 1, characterised in that the filter (22) comprises two longitudinal segments, wherein the filter segment (26) on the rod side is a conventional standard filter segment, and the segment connected to it, on the mouth side, is a co-axial filter segment (23, 24).
3. The ventilated filter cigarette as set forth in claim 1, characterised in that the filter comprises three longitudinal segments, wherein the filter element on the rod side is a conventional standard filter segment, the middle filter segment connected to it is a chamber with a selectively filtering material and the filter segment connected in turn to this is a co-axial filter element.
4. The ventilated filter cigarette as set forth in claim 1, characterised in that the filter comprises three longitudinal segments, wherein the filter element on the rod side is a first conventional standard filter segment, the middle filter segment connected to it is a co-axial filter element and the filter segment connected in turn to this is a second conventional standard filter segment.
5. The ventilated filter cigarette as set forth in any one of claims 1 to 4, characterised in that, in the co-axial filter element (13, 14; 23, 24):

   the diameter of the filter core (14, 24) is dimensioned such that the ratio of the cross-sectional area of the core to the cross-sectional area of the jacket (13, 23) is distinctly smaller than 1;

   the wrapping of the filter core (14, 24) is substantially air permeable, and preferably consists of cellulose acetate or paper;

   wherein in the tobacco rod (11, 21):

   the condensate yield is less than 25 mg, preferably less than 20 mg; and

   the resistance to draw is less than 60 mmWS (water column), preferably less than 50 mmWS (water column).
6. The ventilated filter cigarette as set forth in claim 5, characterised in that the diameter of the filter (12, 22) is between 7.7 and 8.0 mm.
7. The ventilated filter cigarette as set forth in any one of claims 2 to 6, characterised in that the filter segment on the rod side consists of cellulose acetate, and exhibits a low individual titre, preferably 2.1 dpf and lower, and a resistance to draw which is lower than 60 mmWS (water column), preferably 35 to 50 mmWS (water column).
8. The ventilated filter cigarette as set forth in any one of claims 4 to 6, characterised in that the filter segment on the mouth side consists of cellulose acetate, and exhibits a high individual titre, preferably 8 dpf, and a resistance to draw which is lower than 20 mmWS (water column), preferably 10 mmWS (water column).
9. The ventilated filter cigarette as set forth in any one of claims 4 to 6, characterised in that the filter segment on the mouth side is a hollow mouth piece.

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