Abstract: The invention concerns a smoking article filter plug (16) for a cigarette, the filter plug being cylindrical and having a plug wrap (18), grooves (20) being impressed into the plug wrap, and a tipping paper (22) for the attachment of the filter plug to the tobacco rod (12). Some grooves are axially extending with respect to the axis of the filter plug and are open on the side of the tobacco rod and extend continuously only over a part of the length of the filter plug. All grooves are covered by a ventilated tipping paper, which allows ventilating air into the axially extending grooves only. In addition, the invention concerns the use of such a filter for the reduction of the CO/tar ratio as a function of the filter ventilation.

Abstract: The invention concerns a smoking article filter plug (16) for a cigarette, the filter plug being cylindrical and having a plug wrap (18), grooves (20) being impressed into the plug wrap, and a tipping paper (22) for the attachment of the filter plug to the tobacco rod (12). Some grooves are axially extending with respect to the axis of the filter plug and are open on the side of the tobacco rod and extend continuously only over a part of the length of the filter plug. All grooves are covered by a ventilated tipping paper, which allows ventilating air into the axially extending grooves only. In addition the invention concerns the use of such a filter for the reduction of the CO/tar ratio as a function of the filter ventilation.

Abstract: The invention relates to a coaxial smoking article, particularly a coaxial cigarette, comprising a coaxial rod of smokable material, which rod has an inner segment (1) of smokable material surrounded by a covering (2), around which covering is an outer segment (3) of combustible or thermally destructible/decomposable material, which outer segment is also surrounded by a covering (4). The combustible or thermally destructible/decomposable material of the outer segment contains no or only a very small proportion of spot-forming substances. Further, the coverings of the inner and outer segments are such that spot-forming substances in the inner segment are essentially unable to reach the outside of the covering. Hence, a cigarette having reduced potential for the production of spotting is so formed.

Abstract: The invention relates to a coaxial cigarette including a coaxial tobacco rod comprising a rod core, a rod core wrapping, a rod jacket and a rod jacket wrapping and a multi-part ventilated filter wherein the filter comprises a filter wrapping as well as at least two longitudinal segments of which at least one is a coaxial filter segment having a core element, a core element wrapping and a jacket element and wherein the ratio of the resistance to draw of the rod core to the resistance to draw of the rod jacket is greater than unity and preferably in the range of 2 to 4.

Abstract: The invention relates to a coaxial cigarette comprising a coaxial tobacco rod of a core and a rod periphery which contain different mixtures, the sheaths of the rod core and the rod periphery consisting of combustible material and a filter mouthpiece being provided at one end of the coaxial tobacco rod; according to the invention, the ratio of the draw resistance of the core per unit length to the packing density thereof lies in the range from about 0.13 to about 0.27 mm WC cm.sup.2 /mg whilst the ratio of the draw resistance per unit length of the rod periphery to the packing density thereof lies in the range of about 0.07 to about 0.11 mm WC cm.sup.2 /mg; the filter mouthpiece is a conventional preferably ventilated filter.

Abstract: A coaxial filter cigarette with a rod portion having an inner core of material glowing substantially free of residue, in particular tobacco material, a sheath or wrapper for the inner core, an outer shell of tobacco and/or non-tobacco material coaxially surrounding the inner core or its sheath, respectively, a sheath or wrapper for the outer shell, and with a filter portion having a filter core, an air-impermeable sheath or wrapper for the filter core, a filter shell and a sheath or wrapper for the filter shell comprises a zone of the main heat source which is located in the inner core of the rod portion and a zone in which the major part of the aerosol reaching the mouth of the smoker is produced and which is located in the outer shell of the rod portion; the filter portion greatly reduces the combustion gases originating from the inner core of the rod portion and substantially reduces the smoke particles originating from the inner core, whereas the aerosol produced in the outer shell of the rod portion is i

Abstract: A coaxial cigarette comprising an inner core of a material glowing away substantially without residue, in particular tobacco material, with a sheath for the inner core, an outer jacket coaxially surrounding the inner core and its sheath and comprising a tobacco and/or non-tobacco material, and a sheath for the outer jacket, has a diameter of the inner core which lies in the range from 45% to 80% of the outer diameter of the coaxial cigarette; the inner core has a packing density in the range from 300 to 400 mg/cm.sup.3 ; the outer jacket has a packing density in the rnage from 170 to 250 mg/cm.sup.3. The sheath of the inner core has an air permeability of less than 3 ISO units.