MXPA98004126A - Ultra-light coaxial cigarette that includes a filter of multiple par - Google Patents

Abstract

The present invention relates to a coaxial cigarette including a coaxial tobacco rod comprising a rod core, a rod core shell, a rod sleeve, and a rod sleeve jacket, and a multi-vented filter parts, wherein the filter comprises a filter envelope, as well as at least two longitudinal segments, of which at least one is a coaxial filter segment having a core element, an envelope of the core element, and a sleeve element , and wherein the ratio of the suction resistance of the core of the rod to the resistance to the suction of the rod sleeve is greater than 1, and preferably they are on a scale of 2 to

Description

ULTRA-LIGHT COAXIAL CIGARETTE THAT INCLUDES A FILTER OF MULTIPLE PARTS FIELD OF THE INVENTION The present invention relates to a coaxial cigarette comprising a coaxial tobacco rod comprising a core of a rod, a shell of the core of a rod, a sleeve of a rod, and a shell of the sleeve of a rod, and a multi-part vented filter.

BACKGROUND OF THE INVENTION A coaxial cigarette, in which both the filter and the tobacco rod are coaxially configured, is known from German Patent Number DE 41 27 420 Cl. The configuration of this cigarette allows reducing secondary smoke. The filter consists only of a single longitudinal coaxial segment. In the same way, a ventilated coaxial cigarette is known from German Patent Number DE 37 43 597 Cl. This cigarette, in turn, comprises a ventilated coaxial filter consisting of only a single longitudinal segment. The undesirable smoke constituents are eliminated by the use of combustion salts. An additional coaxial cigarette is known from German Patent Number DE 39 01 226 Cl. By adjusting the filtration capacity in the filter core and in the filter jacket of this coaxial filter, the taste perception is optimized. From European Patent Number EP 0 539 191 Bl, lightweight cigarette filters and cigarettes including these filters are known, wherein the filters are formed into multiple parts with different longitudinal compartments. The tobacco rods used are not configured coaxially. European Patent Number EP 0 474 940 Al also samples these filter configurations for non-coaxial cigarettes.

OBJECTS AND ADVANTAGES OF THE INVENTION It is a drawback in the prior art cited above, that a totally coaxial shaped cigarette that is especially suitable as an ultra-light cigarette has not yet been specified. The usual problem in the development of an ultra-light cigarette, is to achieve a very low condensate value (specifically a milligram) within the reach of the ventilation that can be achieved, and that has an acceptable suction for the smoker, the latter being the one that restricts the use of filters that have an extremely high filter capacity, since the material that has a high filter efficiency also has a high specific resistance to suction. The problem of reaching very low condensate values is further aggravated when, for flavor reasons, a certain segment of coaxial filter juxtaposed with a coaxial tobacco rod is used, since the coaxial segment, as described in this case, does not necessarily have a very high retention in the outer jacket, and consequently, it also has a retention as a whole that is lower than that which would typically be selected for the filter of a one milligram cigarette. The object of the present invention is to define a coaxial cigarette that can be optimally configured as an ultra-light cigarette. This object is achieved for a cigarette of the aforementioned kind, wherein the filter of the coaxial cigarette comprises a filter envelope, as well as at least two longitudinal segments, of which at least one is a coaxial filter segment that includes a filter element. core, an envelope of the core element, and a jacket element, and wherein the ratio of the suction resistance of the core of the rod to the suction resistance of the rod jacket is greater than 1, and preference in the scale from 2 to 4. This advantageously defines a coaxial cigarette which, due to its filter configuration and to the adjustment of the parameters for the coaxial components of the tobacco rod, is optimally suitable as a cigarette for the segment of the ultra-light market. The special feature of the invention is that both the effects of the coaxial segments materialize (of rod and filter), as the scope of a very low condensate value, with a positive evaluation of the taste and the suction of the cigarette, being the particular specifications of the individual segments and the specific combination of the individual segments that serve to this purpose. It is particularly convenient when the coaxial cigarettes according to the present invention comprise one or more of the following characteristics in combination: the coaxial filter segment is the filter element at the tobacco end; the core element consists of cellulose acetate, paper or crepe with a non-ventilated retention of 65 to 95 percent; the envelope of the core element is substantially impermeable to air; the jacket element consists of cellulose acetate or other suitable material having a low non-ventilated retention of 15 to 50 percent; the suction strength of the jacket element is on the scale of 80 to 150 mm WC; the resistance to suction of the core element is on the scale of 160 to 450 mm WC; a cellulose acetate jacket element has a single denier of 2.5 to 5 dpf; a cellulose acetate core element has a single denier of 1.5 to 2.1 dpf; Preferably, the suction resistance of the coaxial filter segment is on the scale of 45 to 120 mm WC. Preferably a non-ventilated coaxial filter segment is used.

PREFERRED MODALITIES OF THE INVENTION According to a preferred embodiment of the coaxial cigarette according to the invention, the filter comprises three longitudinal segments, that is to say a segment of the end of the mouth having a low retention, an average segment having a high retention , and a coaxial filter segment at the end of the tobacco. The middle filter segment of the coaxial cigarette according to the invention, consists, according to a preferred embodiment, in a filter material such as paper, crepe, or preferably cellulose acetate, providing a suction resistance of 30 to 100 mm WC, preferably 50 to 60 mm WC, and its single denier for cellulose acetate is in the range of 1.5 to 5 dpf, preferably in the range of 1.5 to 2.1 dpf. In this configuration, the end segment of the filter mouth of a coaxial cigarette according to the invention, preferably consists of a filter material, such as paper, crepe, or more preferably, cellulose acetate. In the same way, a hollow filter tip can be provided. The resistance to suction of the mouth end segment is on the scale of 0 (hollow filter tip) to 100 mm WC, and preferably on the scale of 10 to 15 mm WC. The coaxial tobacco rod of the coaxial cigarette according to the invention advantageously comprises one or more of the following characteristics in combination: the suction resistance of the total rod is on the scale of 30 to 100 mm WC, preferably of 50 mm WC. the air permeability of the shell of the rod jacket is in the range of 15 to 300 CU (Coresta Units), preferably in the range of 50 to 100 Coresta Units; The jacket of the rod jacket contains combustion salts such as Na acetate or K citrate, preferably K citrate, on a scale of 1 to 2.5 percent, more particularly of about 1.75 percent; The core wrap of the rod consists of sheet tobacco or cigarette paper having an air permeability of 0 to 50 Coresta units, preferably 0 to 5 Coresta units; - Flavoring tobaccos are preferably configured in the rod jacket. All the features described above for the coaxial cigarette according to the invention contribute individually or in combination towards the definition of a coaxial cigarette particularly suitable for the ultra-light market segment., being both the material parameters cited, and the configuration characteristics for the different components of the cigarette, which contributes towards the achievement of this object. According to a preferred embodiment, the filter of the coaxial cigarette according to the invention has an overall length of 21 to 31 millimeters, and preferably 27 millimeters, where the individual dimensions are as follows: the end segment of the mouth it has a length of 4 to 16 millimeters, preferably of 9 to 15 millimeters, the middle segment has a length of 0 to 12 millimeters, preferably of 3 to 7 millimeters, and the end segment of the tobacco has a length of 7 to 16 millimeters, preferably from 8 to 13 millimeters. In-line ventilation perforations can be produced by laser drilling, in the same conceivable way using previously perforated filter envelopes. Ventilation perforations are preferably configured in the middle segment portion; however, if the length of the end segment of the mouth exceeds 11 millimeters, the ventilation perforations can also be configured in the portion of the end segment of the mouth. The ventilation speed of the filter is preferably in the range of 50 to 85 percent. With respect to the diameter of the filter, this can be in the range of 7 to 9 millimeters, and preferably of 7.8 millimeters, the core element of the coaxial filter segment having a diameter of 4 to 6 millimeters, and preferably 5 to 6 mm. The tobacco rod of a coaxial cigarette according to the invention, in a preferred configuration, has a diameter on the scale of 7 to 9 millimeters, and is preferably of 7.8 millimeters. In this configuration, the core of the coaxial cigarette rod may have a diameter of 4 to 6 millimeters, and preferably of 5 to 5.6 millimeters.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE FIGURE Now the invention will be detailed based on the single Figure, which shows a cross section through a coaxial cigarette according to the invention. The coaxial cigarette shown in the Figure, due to its construction can be divided into a filter 10 and a tobacco rod 20. The tobacco rod 20 is configured coaxially, comprising from the inside out, the following components: the core of the rod 22, - the shell of the core of the rod 23, the sleeve of the rod 21, and the shell of the rod sleeve 24. The tobacco relevant to the taste of this cigarette, preferably are formed in the sleeve of the rod 21 For the wrapping of the core of the rod preferably sheet tobacco is used. The resistance to the suction of the core of the rod is higher than that of the sleeve of the rod, this being achieved by a suitable selection of the material, and an adjustment of the parameters, such as, for example, the packing density. Suitable values for the suction resistance are approximately 150 mm WC for the core rod 22, and approximately 75 mm WC for the rod sleeve 21, while the resistance to suction of the tobacco rod 20 as A whole, it is about 50 mm WC. The tobacco rod has a usual external diameter of approximately 7.8 millimeters, and the core of the rod 22 is in the scale of diameters of 5 to 6 millimeters. The filter 10 is attached to the tobacco rod 20, comprising in the illustrated configuration, three longitudinal segments 11, 12, and 13. The longitudinal segment of the mouth end 11 of the filter 10, is a segment having a low retention, made of a filter material, such as paper, crepe, or preferably cellulose acetate. Its resistance to suction is approximately 10 to 15 mm WC. Provided as the median longitudinal element 12 of the filter 10, there is a filter plug, again of paper, crepe, or preferably of cellulose acetate. The segment 12 provides a high specific retention, such that a retention of approximately 30 percent (not ventilated) is realized, even for the short medium longitudinal segment 12, for a suction resistance of approximately 50 mm WC. In the illustrated example, this middle segment 12 is the ventilated segment; ventilation holes are indicated at 18. Ventilation perforations 18 can be produced by in-line laser beam drilling, that is, during the production process, but there is also the possibility, however, of using pre-drilled cover paper. for the filter. The ventilation perforations ensure a ventilation speed of the filter in the range of 50 to 85 percent, more particularly of 65 percent, being located preferably in the direction of the mouth end of this middle segment 12. Located between the middle segment 12 and the tobacco rod 20, is then the coaxial filter segment 12, which comprises: a core element 15, an envelope of the core element 17, and a jacket element 14. The complete filter is surrounded by a wrapper of filter 16, for example filter paper. The core element 15 of the coaxial segment 13, consists of cellulose acetate having a retention of 65 to 95 percent, more particularly of about 80 percent relative to a non-vented filter. The envelope of the core element 17 is substantially impermeable to air. The jacket element 14 consists of cellulose acetate or some other suitable material having a low retention of 15 to 50 percent, more particularly about 30 percent, again in relation to the non-vented filter. The suction strength of the core element is higher than the suction strength of the jacket element 14, and is approximately 260 mm WC, while the suction strength of the jacket element is approximately 14 to 120 mm WC. The additional specifications of materials and dimensions are in the scales indicated above. The proper selection of these specifications makes it possible, in accordance with the invention, to provide a coaxial cigarette that is highly suitable for the ultra-light market segment.

Claims (11)

NOVELTY OF THE INVENTION Having described the above invention, it is considered as a novelty, and therefore, the content of the following is claimed as property: CLAIMS

1. A coaxial cigarette, which comprises: a) a coaxial tobacco rod (20), comprising a rod core (22), a rod core shell (23), a rod sleeve (21), and a wrapper of the rod sleeve (24), and b) a multi-part ventilated filter (10), characterized in that: c) the filter (10) comprises a filter envelope (16), as well as at least two longitudinal segments, which at least one is a coaxial filter segment (13), having a core element (15), an envelope of the core element (17), and a jacket element (14), and because d) the proportion of the suction resistance of the core of the rod (22) to the suction resistance of the rod sleeve is greater than 1, and preferably it is in the range of 2 to 4.

2. The coaxial cigarette according to claim 1, characterized in that the filter (10) comprises three longitudinal segments, that is, a segment of the mouth end (11) having a low retention, a middle segment (12) which has a high retention, and a coaxial filter segment of the tobacco end (13). The coaxial cigarette according to claim 1 and 2, which comprises a coaxial filter segment (13), characterized by at least one of the following characteristics: the core element (15) consists of acetate cellulose, paper, or crepe, with a non-ventilated retention of 65 to 95 percent; - the envelope of the core element 17 is substantially impermeable to air; the jacket element (14) consists of cellulose acetate or other suitable materials having a low non-ventilated retention of 15 to 50 percent; - the suction resistance of the jacket element (14) is on the scale of 80 to 150 mm WC; the resistance to suction of the core element (15) is on the scale of 160 to 450 mm WC; a cellulose acetate jacket element (14), having a single denier of 2.5 to 5 dpf; a core element of cellulose acetate (15), having a single denier of 1.5 to 2.1 dpf. The coaxial cigarette according to claim 2 or claim 3, characterized in that the middle filter segment (12) consists of a filter material such as paper, crepe, or preferably cellulose acetate, provides a resistance to suction of 30 to 100 mm WC, preferably 50 to 60 mm WC, and because its single denier for cellulose acetate is in the range of 1.5 to 5 dpf, preferably in the range of 1.5 to 2.1 dpf. 5. The coaxial cigarette according to claim 2, characterized in that the end segment of the mouth (11) consists of a filter material such as paper, crepe, or preferably cellulose acetate, or is a hollow point, and provides a suction resistance of 0 to 50 mm WC, preferably 10 to 15 mm WC. 6. The coaxial cigarette according to claim 1, characterized in that it includes a coaxial tobacco rod that comprises at least one of the following characteristics: the resistance of the total rod to the suction is in the scale from 30 to 100 mm WC, preferably 50 mm WC; the air permeability of the shell of the rod jacket (24) is in the range of 15 to 300 Coresta units, preferably 50 to 100 Coresta units; the sheath of the rod jacket (24) contains combustion / brightness salts, such as Na acetate or K citrate, preferably K citrate, on a scale of 1 to 2.5 percent; the wrapping of the core of the rod (23) consists of leaf tobacco or cigarette paper, having an air permeability of 0 to 50 Coresta units, preferably 0 to 5 Coresta units; Flavoring tobaccos are preferably configured in the jacket of the rod (21). 7. The coaxial cigarette according to claim 2 in any of claims 2 to 6, characterized in that the filter has an overall length of 21 to 31 millimeters, preferably 27 millimeters, which includes: the end of the mouth segment (11) having a length of 4 to 16 millimeters, preferably of 11 to 13 millimeters, the middle segment (12) having a length of 4 to 12 millimeters, preferably of 5 to 7 millimeters, and the end segment of the tobacco (13), which has a length of 7 to 16 millimeters, preferably of 8 to 10 millimeters, producing the ventilation perforations (18) preferably by laser perforation, or by using a pre-perforated filter envelope configured in the portion of the middle segment (12), or more particularly in the portion of the end segment of the mouth (11), when the The length of the end of the mouth segment (11) exceeds 11 millimeters and the ventilation speed of the filter is on the scale of 50 to 85 percent. 8. The coaxial cigarette according to claim 1, characterized in that the diameter of the filter (10) is in the range of 7 to 9 millimeters, preferably 7.8 millimeters, with the core element ( 15) of the segment of the coaxial filter (13) a diameter of 4 to 6 millimeters, and preferably of 5 to 6 millimeters. 9. The coaxial cigarette according to claim 1 in any of claims 1 to 8, characterized in that the tobacco rod (20) has a diameter in the range of 7 to 9 millimeters, preferably 7.8 millimeters, having the core of the rod (22) a diameter of 4 to 6 millimeters, preferably 5 to 5.6 millimeters. 10. The coaxial cigarette according to claim 1, characterized in that the resistance to suction of the coaxial filter segment (13) is on the scale of 45 to 120 mm WC. 11. The coaxial cigarette according to claim 1 in any of claims 1 to 10, characterized in that the coaxial filter segment (13) is not ventilated.