Tob. Reporter, 1985, 113-11, p. 68, ISSN.0361-5693
Tobacco rod consists of two segments
GREENE T.B.; TOWNSEND D.E.; PERFETTI T.A.
US Patent 4,595,024 assigned to R.J. Reynolds. The segment toward the filter end of the tobacco rod has a density at least 20 percent greater than the fire-end segment. The density differential may be combined with a nicotine differential, such that...