Cigarette rods having segmented sections
AssigneeR. J. Reynolds Tobacco Company
InventorsDavid E. Townsend, Thomas A. Perfetti
Life of this patent
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Abstract
Cigarette rods include four segments of smokable material. First and second segments are positioned at the extreme ends of the rod. The first segment is positioned at the end of the rod to be lit. A third segment is positioned adjacent the first segment, and a fourth segment is positioned adjacent the second segment. The density of the third segment is greater than the fourth segment. The first and second segments can be "dense ends" or "loose ends" relative to the respective adjacent segments. The cigarette rods have a relatively uniform burn rate provided by treatment of the wrapping material of the rod with burn rate suppressants and burn rate accelerators in the positions thereof which overlie the third and fourth segments, respectively.
Claims38
A rod suitable for the manufacture of a cigarette, said rod comprising filler material contained in wrapping material and having the two ends thereof open to expose the filler material, wherein
- (A) said filler material forms at least four segments within said rod and each segment is defined by its density, wherein
- (i) the first segment is disposed at the extreme end of the rod which is to be lit;
- (ii) the second segment is disposed at the end of the rod opposite the end which is to be lit;
- (iii) the third segment is disposed adjacent to the first segment;
- and
- (iv) the fourth segment is disposed adjacent to the second segment;
- wherein each of the third segment and the fourth segment has a substantially uniform density in the region along the longitudinal axis of the rod and across the rod in a plane perpendicular to the longitudinal axis thereof, and the density of the fourth segment is less than that of the third segment such that the density differential therebetween is at least about 15 percent;
- and
- (B) said wrapping material has
- (i) a relatively high burn rate capability at least in a substantial region thereof which overlies the third segment, and
- (ii) a relatively low burn rate capability at least in a substantial region thereof which overlies the fourth segment.
The rod of claim 29 wherein the burn rate accelerator is applied to the wrapping material and extends (i) totally around the periphery of the rod, and (ii) along the length of the rod in the region which overlies the first and third segments;
- and the burn rate suppressant is applied to the wrapping material and extends (i) totally around the periphery of the rod, and (ii) along the length of the rod in the region which overlies the second and fourth segments.
Dependencies are inferred from the claim text.