| 摘要 |
An improved cigarette is prepared through use of a modified cigarette paper as a wrapper. The wrapper is treated in preselected areas with a burn control additive, preferably a strong combustion supporting, oxidizing agent. When the burning coal reaches the area of treatment, the treated area is burned away, allowing for the passage of air through the opening created, during smoking of the cigarette. This air entering through the opening dilutes the smoke stream and results in a substantial reduction in smoke substituents delivered on smoking of the cigarette, with a corresponding improvement in the organoleptic properties of the smoke. The preselected areas on the wrapper are so arranged that larger areas are burned away as the burning coal proceeds from the tip of the cigarette toward the mouthpiece of the cigarette, so that increasing amounts of air are drawn into the tobacco column as smoking proceeds, and substituent delivery is correspondingly reduced in greater amounts as smoking proceeds, so as to provide for a more uniform constituent delivery. The strong, combustion supporting, oxidizing agent may be sodium chlorate, sodium bromate, potassium chlorate, an alkali or alkaline earth metal perchlorate, sodium nitrite, potassium nitrite, ammonium perchlorate or nitric acid. The burn accelerating agent is applied so as to cover 2 to 50 percent of the wrapper and in concentration constitutes 1/4 to 8 milligrams per square centimeter of the treated portion.
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