Patent ID: 7938126

Claim:
A low ignition propensity cigarette comprising: a paper tube having an axis, a core region formed of shred tobacco filled in said paper tube to a first filling density, and extending along the axis, and a hollow cylinder-shaped heat insulating region formed of second shred tobacco filled in the paper tube to a second filling density which is lower than the first filling density, said heat insulating region being arranged separately from a core region, wherein said heat insulating region includes an inner cylindrical-shaped surface which is disposed in direct contact with an outer cylindrical-shaped surface of said core region, and an outer cylindrical-shaped surface which is disposed in direct contact with an inner surface of the paper tube, and when the cigarette is lying with a long axis thereof parallel to a surface on which the cigarette rests, said heat insulating region has a part which lies between a lower part of said paper tube and said core region, the lower part of said paper tube being in contact with the surface, wherein the first filling density of said core region is in a range of 0.15 to 0.35 g/cm 3 , and the second filling density of said heat insulating region is in a range higher than or equal to 0.05 g/cm 3 and lower than 0.14 g/cm 3 , and wherein said part of said heat insulating region has a thickness of 1 to 3 mm, wherein said core region is made of normal shred tobacco from which expanded shred tobacco is excluded, while said heat insulating region is made of the expanded shred tobacco.