CN1232192C - Item for smoking - Google Patents

Abstract

The invention relates to a ventilated filter cigarette, comprising a covered tobacco strand (11) and a filter (20) with ventilation means, with at least two filter pieces (22, 23). Ventilation holes (14) are arranged in the region of the mouthward filter piece (22). Furthermore, the mouthward filter piece (22) is made from a single filter segment (22), whilst the strandward filter piece (23) comprises a filter segment with a core (24) and a shell (26), a so-called coaxial filter piece or a coaxial filter.

Description

filter cigarettes

technical field

The invention relates to a filter cigarette.

Background technique

Filter structures for insertion into cigarette filters comprising several filter parts with different material properties are used in the prior art to solve different problems. In addition, the breathability of the filter is used to ensure a moderate smoking and lower inhalation of harmful substances.

EP 474 940 B2 and EP 608 047 B1 describe cigarette filters in which a central core comprises a different filter material than the sleeve. The cigarette filter is also known as a core or coaxial filter. In an embodiment of EP 474 940 B2 (Fig. 5), the filter comprises two longitudinal filter segments, namely the vented rod-side core filter portion and a mouth-side single filter portion, wherein the mouth-side single filter portion The purpose of the filter portion is for aesthetic purposes. A disadvantage of the cigarette filter described above is that the envelope of the inner core of the core filter segment comprises a material which is permeable to smoke so that smoke can flow perpendicular to the boundary layer between the core and sleeve of the filter.

EP 0 558 166 B1 describes a ventilated filter cigarette which likewise comprises a single filter segment at the mouth end and a core filter segment at the rod side. However, the filter cigarette has a cavity between the two filter elements, which is filled with an adsorption medium (eg activated carbon). As a result, the flavor of the cigarette and the composition of the components of the cigarette change strongly due to the adsorption medium, making it unacceptable to many smokers.

EP 0 880 904 A1 and DE 39 01 226 C1 accomplish this task by means of a coaxial arrangement not only of the cigarette rod but also of the filter, i.e. to achieve a cigarette with a particularly low condensation value, which is first achieved by means of the cigarette rod The coaxial structure is achieved. A disadvantage of this construction, however, is the high cost of the special processing equipment necessary for the processing of the coaxial cigarette rod.

The task of EP 539 191 B1 is to provide a ventilated filter cigarette which is particularly light in weight. This has the disadvantage that the material thicknesses used (not only of the cigarette rod but also of the filter) must be minimal in order to achieve a particularly light weight cigarette, but the possibilities for variation in the manufacture of which are very limited. Here the ventilation zone is in the filter section on the rod side.

Contents of the invention

It was the task of the inventors to provide a ventilated filter cigarette which does not have the above-mentioned disadvantages and whose filter element acts to reduce the particle phase of the smoke (eg nicotine) and thereby simultaneously achieve a gas-phase smoke component A super-proportional reduction of , wherein the filtered smoke retains components that are palatably acceptable to the consumer.

The technical solution to the above-mentioned task consists in a filter cigarette with a wrapped cigarette rod and a filter with a vent means comprising at least two filter parts, wherein the vent means are arranged in the region of the mouth-side filter parts Inside; the filter part on the mouth side is an at least single filter part, the filter part on the cigarette rod side is a coaxial filter part with a core and a sleeve; wherein the tobacco rod is a single rod; the pressure drop ratio of the core The pressure drop of the sleeve is small.

Furthermore, the filter, with the above-mentioned advantages, will be able to offer a greater possibility of variation with regard to sensory, tactile and visual aspects.

Another task is to remove the tensile resistance of the filter from the retention of the filter, i.e. to achieve an increase in the retention capacity for smoke inclusions, without having to endure a sharp increase in the tensile resistance, as it is in conventional filter structures Inevitably so.

Another task of the present invention is to provide a product with the above-mentioned advantages for the market, where chamber filters, especially such chamber filters filled with activated carbon, are favored not only for taste reasons but also for tactile reasons. reject.

According to a preferred embodiment of the invention, the ratio of the pressure drop of the core to the pressure drop of the jacket is about 2. A reduction of the gas phase composition to between 10 and 90% is achieved by aeration. Alternatively a reduction of the gas phase composition to between 10 and 50% can be achieved by aeration.

Description of drawings

The present invention will be described below in conjunction with embodiment:

Fig. 1 schematically shows the structure of a filter cigarette according to the present invention.

FIG. 2 schematically shows the structure of another embodiment of a filter cigarette according to the invention.

Detailed ways

The filter cigarette comprises a cigarette rod 10 and a filter 20 . The cigarette rod 10 comprises a single tobacco rod 11 and an outer casing 12 surrounding the tobacco rod 11 . The filter 20 comprises at least two filter parts and is connected to the cigarette rod 10 by a wrapping paper 13 which is at least 3 mm longer than the filter 20 . Typically the length of the tobacco rod 11 is between 55 and 75 mm and the length of the filter 20 is 21 to 27 mm.

The filter 20 is ventilated in the region of the mouth-side filter part. This ventilation can be selected in the range of 10 to 90%.

In the region of the filter part 22 on the mouth side, a roll paper 13 with ventilation holes 14 is arranged as ventilation means, arranged in 1 to 3 rows, preferably with two rows of holes surrounding the filter 20, but in the filter part on the rod side 23 is completely airtight. During smoking, ventilation gas is drawn into the filter 20 through the vent holes 14, resulting in a super-proportional reduction in the gas phase constituents of cigarette smoke as compared to the reduction in the particulate phase. In one embodiment, the vent means can extend beyond the mouth-side filter part to the rod-side filter part a little, by approximately 2 mm. In this way, the flow-through air can likewise be sucked into the mouth-side filter part 22 after deflection.

Those skilled in the art already know how to produce vent holes, for example mechanically or electrostatically or by laser perforation. The ventilation means are likewise known as holes, channels or gaps in the material.

The mouth-side filter part 22 comprises at least one filter segment. The filter portion 22 on the mouth side may also comprise two or more filter plugs, as shown in FIG. 2 . As a result, the possibility of changing the filter material is greater, for example, in addition to a filter element 22b on the mouth side, it also includes an additional filter element 22a, which can have markings or colors on their visible cross-section.

The filter part 23 constituting the rod side of a coaxial filter has a core 24 and a sleeve 26 coaxially surrounding the core. The pressure drop across the core 24 may be between 10 and 50 mm of water. The jacket 26 is designed such that the pressure drop of the jacket 26 is at least twice greater than the pressure drop of the core 24 . The sleeve 26 can also be made substantially smoke-tight or enveloped in a smoke-tight manner.

The mouth side filter portion 23 is configured to allow smoke to flow primarily through the core 24 . Due to the constriction of the cross-section, the smoke flow rate in the core segment increases significantly, which involves an increased positive pull-out resistance at a relatively small holding force. This achieves a similar effect: when the constriction of the cross-section of the material through which the smoke flows is caused by the core of the coaxial filter which is designed to be almost airtight, all the smoke can only pass through the sleeve.

Only when the smoke flow rate in the rod-side filter part 23 is multiplied does a large amount of air flow occur in the mouth-side filter part 22 by means of the ventilation means 14 . This achieves a super-proportional reduction of the gas phase components with respect to the particle phase, thus simultaneously ensuring an acceptable draw resistance for the smoker.

Compared with the prior art, the variation possibilities of the embodiment within a given target are very large, since in the filter cigarette according to the invention a super-proportional drop of the gas phase occurs without any significant influence on the efficiency , thus excluding, for example, the typical effect "air smell" defined by smokers.

Filter materials suitable for the filter 20 are planar, fibrous or granular filter materials such as cellulose; cellulose resin, preferably cellulose acetate; blown melt filter materials produced for example according to WO97/33026; air Sedimentary materials, such as filter materials with additives produced according to US 4,375,447; tobacco, such as reconstituted tobacco according to DE 199 25968; other readily decomposable filter materials or thermoplastic filter fibers.

The addition of additives can improve the feel, taste and appearance of cigarettes according to the invention and/or have an additional effect on retention of choice. Thus, a filter element such as the filter section 22 may be provided with activated carbon particles to increase the adsorption of gas phase substances. In order to increase consumer acceptance of the cigarette additionally by visual means, it is possible, for example, to color the mouth-side filter plug. The pH of the particle spectrum and thus the taste impression can be influenced by adding acids or bases.

Addition of additives can be done by spraying or jetting onto the filter material, eg fibers, or by direct injection into the material strip.

Additives suitable for use as filter materials are: fragrances, acids or bases in suspended or dissolved form, or additives with selected effective adsorbents such as activated carbon or _SiO2 . Further additives with a selective retention effect are: organic acids, bases, e.g. carbonic acids and their salts, metals and metal oxides, carbon components, ion exchange systems (e.g. zeolites), alcohols, polyphenols and porphyrins derivative.

Additional additives such as plasticizers such as glycerol acetate, triethylene glycol diacetate, diethyl citrate; additives to accelerate photodegradation such as titanium dioxide; additives to facilitate biodegradation; vitamins or pigments can be used in all Separate formation of filtering structures is required.

A range of additional implementations suitable for cellulose acetate specification is: for the core 24, the range of single denier is 3.0 to 8.0 den, preferably 8.0 den, and the range of total denier is 15,000 to 50,000 den, preferably 17,000 den . For the sheath 26, the individual denier ranges from 1.5 to 3.0 den, preferably 2.1 den, and the total denier ranges from 40,000 to 75,000 den, preferably 55,000 den.

The filter portion 22 for the mouth side may range in single denier from 1.5 to 5 den in the case of cellulose acetate as the filter material, and in the range of total denier from 15,000 to 60,000 den. , wherein the filtering part may comprise two segments 22a and 22b of different classes of the same class.

Example 1:

Cigarette A has a 63 mm long tobacco rod 11 and a 21 mm long multipart filter 20 .

The core 24 of the filter part 23 on the rod side has a diameter of 5.5 mm at a length of 8.0 mm. It is made of cellulose acetate with a single denier of 6.0 den and a total denier of 17,000 den. The pull-out resistance or pressure drop of the core 24 is 27mm water column.

The sleeve 26 , which coaxially surrounds the core 24 , has an inner diameter of 5.5 mm and an outer diameter of 7.8 mm for a likewise length of 8.0 mm. Cellulose acetate with a single fineness of 2.1 den and a total fineness of 55,000 den can be used as the material.

Typically the coaxial filter has a length of 8.0mm at a diameter of 7.8mm.

The filter portion 22 on the mouth side is a single piece and made of cellulose acetate. It has a diameter of 7.8mm at a length of 13mm. In the region of the mouth-side filter part, the ventilation zone is formed in the form of a row of laser perforations. The filter ventilation of this cigarette A reached 35%.

Example 2:

To evaluate Cigarette A of Example 1, the cigarette was analyzed and its data compared to that of Cigarette V1 having conventional acetic acid with a length of 21 mm, a single titer of 3.0 den and a filter air permeability of 18% Cellulose filters and smoking according to ISO standards.

Table 1 shows the results for the cigarette data. Table 1 Cigarette V1 Cigarette A Δ[%] Coagulation rate [mg/cigarette] 11.9 11.9 0.00 Nicotine [mg/cigarette] 0.86 0.9 0.04 CO [mg/cigarette] 10.5 8.4 20.0 NO [mg/cigarette] 140.6 111.9 20.4 ∑ other gas phase components [μg/cigarette] 2169.7 1666.1 23.2

Example 3:

Cigarette B has a 59 mm long cigarette rod and a 25 mm long multi-part filter 20 .

The core 24 of the filter part 23 on the rod side has a diameter of 5.5 mm at a length of 10.0 mm. It is made of cellulose acetate with a single denier of 6.0 den and a total denier of 17,000 den. The pull-out resistance or pressure drop of the core 24 is 25mm water column.

The sleeve 26 , which coaxially surrounds the core 24 , has an inner diameter of 5.5 mm and an outer diameter of 7.8 mm for a length likewise of 10.0 mm. Cellulose acetate with a single fineness of 2.1 den and a total fineness of 55,000 den can be used as the material.

Typically the coaxial filter has a length of 10.0mm at a diameter of 7.8mm.

The filter portion 22 on the mouth side is a single piece and made of cellulose acetate. It has a diameter of 7.8mm at a length of 15mm. In the region of the mouth-side filter part 22 , the ventilation zone is formed in the form of a row of ventilation holes 14 formed by laser perforation. The filter air permeability of this cigarette B reached 51%.

Example 4:

To evaluate Cigarette B in Example 3, cigarette analysis data were obtained and compared to that of Cigarette V2 having a conventional cellulose acetate filter of 25 mm in length, 3.0 denier and 38% filter ventilation , and smoking according to ISO standards. Table 2 shows the results for the cigarette data. Table 2 Cigarette V2 Cigarette B Δ[%] Coagulation rate [mg/cigarette] 6.9 6.9 0.00 Nicotine [mg/cigarette] 0.56 0.59 -5.36 CO [mg/cigarette] 5.5 4.2 23.6 NO [mg/cigarette] 59.9 44.5 25.7 ∑ other gas phase components [μg/cigarette] 1370.2 1070.0 21.9

It is evident from the above examples that the reduction of the gas phase components of cigarette smoke by means of the new filter structure is disproportionately high compared to its particle phase.

Claims (11)

1. A filter cigarette with a wrapped tobacco rod and a filter (20) with a ventilation mechanism, the filter comprising at least two filter portions (22, 23), wherein - the venting mechanism is arranged in the region of the filter part (22) on the mouth side; and - the filter part (22) on the mouth side is an at least single filter part, the filter part (23) on the rod side is a coaxial filter part with a core (24) and a sleeve (26); It is characterized by: - the tobacco rod (11) is a single rod; and - The core (24) has a lower pressure drop than the jacket (26). 2. The filter cigarette as claimed in claim 1, characterized in that the mouth-side filter part (22) comprises a planar, fibrous or granular filter material. 3. The filter cigarette according to claim 2, characterized in that: as the filter material, cellulose, cellulose resin, blown filter material, air sedimentation material, filter material with additives, tobacco, easily decomposable filter material or thermoplastic filter fibers. 4. The filter cigarette as claimed in claim 3, characterized in that the filter material contains an additive. 5. The filter cigarette as claimed in claim 4, characterized in that as additives are fragrances, acids or bases in suspended or dissolved form, or additives with selected effective adsorbents, activated carbon or _SiO2 . 6. The filter cigarette according to claim 1, characterized in that the core (24) of the coaxial filter part (23) on the rod side comprises a fiber material of coarse fiber fineness, wherein the value for single denier is between 3.0 and In the range of 8.0 den, the value of the total fineness is in the range of 15,000 to 50,000 den. 7. The filter cigarette according to claim 6, characterized in that: the single fineness is 6.0 den, and the total fineness is 17,000 den. 8. The filter cigarette according to claim 1, characterized in that: the sleeve (26) of the coaxial filter part (23) on the rod side includes a single fineness in the range of 1.5 to 3.0den, and a total fineness of 40,000 to 75,000 den range of fiber materials. 9. The filter cigarette according to claim 8, characterized in that: the single fineness is 2.1 den, and the total fineness is 55,000 den. 10. The filter cigarette as claimed in claim 1, characterized in that the outer surface of the core (24) is surrounded or made smoke-tight. 11. The filter-tipped cigarette according to claim 1, characterized in that the ventilation means extends beyond the mouth-side filter part to the rod-side filter part, whereby a deflection of the through-flow air takes place in the mouth-side filter part.

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