Patent EA-004280-B1 (EA)
Title: Recess filter and smokeable article containing a recess filter
Inventor: LECOULTRE ETIENNE
IPC: A24D3/04
Filed: 2000-07-12
Abstract: 1. A smokeable article (10) with a tobacco rod (12), which is encompassed by cigarette paper (14) and/or one or more tobacco sheets, and - with a ventilated recess filter (20), wherein the tobacco rod (12) and recess filter (20) are connected to each other by an at least partially air-permeable covering paper (16), and wherein - the recess filter (20) has one or more filter elements (22, 24) at the tobacco end of the recess filter (20) and a tubular cavity (26) at the mouth end of the recess filter (20), and - the cavity (26) is encompassed by a (tubular) cavity wall (32), characterized in that - the recess filter (20) has a ventilation of at least 10%, - the cavity wall (32) encompasses only the cavity (26) or encompasses the cavity (26) and the filter element or filter elements (22, 24) incompletely, - the length of the cavity (26) is 10 mm or less, and - the ratio of the length of the cavity (26) to the total length of the recess filter (20) (including the length of the cavity (26)) is 0.3 or less. 2. The smokeable article (10) according to claim 1, characterized in that the cavity wall (32) has a porosity of 100 Coresta units or less and has no perforations. 3. The smokeable article (10) according to claim 1 or 2, characterized in that the cavity wall (32) encompasses only the cavity (26) or encompasses the cavity (26) and the filter element or filter elements (22, 24) in such a way that at least at the tobacco end of the recess filter (20), one filter element (22, 24) is at least partially not encompassed by the cavity wall (32). 4. The smokeable article (10) according to one of claims 1 to 3, characterized in that each filter element (22, 24) is encompassed by a filter wrap (28, 30) and at least one of the filter wraps (28, 30) is at least partially air-permeable. 5. The smokeable article (10) according to one of claims 1 to 4, characterized in that the cavity wall (32) and the filter element or filter elements (22, 24) with their possibly provided filter wraps (28, 30) are encompassed by an at least partially air-permeable tipping wrap (34), which is disposed between the covering paper (16) on the one hand and the cavity wall (32) and filter wraps(s) (28, 30) or filter element(s) (22, 24) on the other. 6. The smokeable article (10) according to one of claims 1 to 5, characterized in that the filter elements (22, 24) are the shape of circular or elliptical cylinders. 7. The smokeable article (10) according to one of claims 1 to 6, characterized in that the ventilation of the recess filter (20) is at least 40%, in particular at least 60%, and particularly preferably at least 75%. 8. The smokeable article (10) according to one of claims 1 to 7, characterized in that the length of the cavity (26) is 6 mm or less. 9. The smokeable article (10) according to one of claims 1 to 8, characterized in that the length of the cavity (26) is 4 to 6 mm, in particular approx. 5 mm, and the total length of the recess filter (20) is 20 to 40 mm, in particular from 25 mm to 31.5 mm. 10. The smokeable article (10) according to one of claims 1 to 9, characterized in that the diameter of the smokeable article (10) is 7.6 to 8.4 mm or 5.0 to 7.6 mm. 11. The recess filter (20) for a smokeable article (10) - with one or more filter elements (22, 24) at a first end of the recess filter (20), - with a tubular cavity (26) at the second end of the recess filter (20), and - with a (tubular) cavity wall (32) that encompasses the cavity (26), characterized in that - the recess filter (20) has a ventilation of at least 10%, - the cavity wall (32) encompasses only the cavity (26) or encompasses the cavity (26) and the filter element or filter elements (22, 24) incompletely, the cavity wall (32) and the filter element or filter elements (22, 24) are encompassed by an at least partially air-permeable tipping wrap (34), the length of the cavity (26) is 10 mm or less, and the ratio of the length of the cavity (26) to the total length of the recess filter (20) (including the length of the cavity (26)) is 0.3 or less. 12. The recess filter (20) according to claim 11, characterized in that the cavity wall (32) has a porosity of 100 Coresta units or less and has no perforations. 13. The recess filter (20) according to claim 11 or 12, characterized in that the cavity wall (32) encompasses only the cavity (26) or encompasses the cavity (26) and the filter element or filter elements (22, 24) in such a way that at least at the first end of the recess filter (20), one filter element (22, 24) is at least partially not encompassed by the cavity wall (32). 14. The recess filter (20) according to one of claims 11 to 13, characterized in that each filter element (22, 24) is encompassed by a filter wrap (28, 30) and at least one of the filter wraps (28, 30) is at least partially air-permeable. 15. The recess filter (20) according to one of claims 11 to 14, characterized in that the filter elements (22, 24) are the shape of circular or elliptical cylinders. 16. The recess filter (20) according to one of claims 11 to 15, characterized in that the ventilation of the recess filter (20) is at least 40%, in particular at least 60%, and particularly preferably at least 75%. 17. The recess filter (20) according to one of claims 11 to 16, characterized in that the length of the cavity (26) is 6 mm or less. 18. The recess filter (20) according to one of claims 11 to 17, characterized in that the length of the cavity (26) is 4 to 6 mm, in particular approx. 5 mm, and the total length of the recess filter (20) is 20 to 40 mm, in particular from 25 mm to 31.5 mm. 19. The recess filter (20) according to one of claims 11 to 18, characterized in that the diameter of the recess filter (20) is 7.6 to 8.4 mm or 5.0 to 7.6 mm. 20. A recess filter rod (40), which is comprised of a number of recess filters (20) according to one of claims 11 to 19, wherein the mouth ends of the recess filters (20) are attached to the mouth ends of the adjacent recess filters (20) and the tobacco ends of the recess filters (20) are attached to the tobacco ends of the adjacent recess filters (20). 21. The recess filter rod (40) according to claim 20, which is comprised of 2, 4, or 6 recess filters (20).