レーザ光散乱法によるたばこ主流煙の性状変化測定

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タイトル別名
  • Measurement of Property Change in Cigarette Main-Stream Smoke Using Laser Light Scattering Method
  • レーザコウ サンランホウ ニ ヨル タバコ シュリュウ エン ノ セイジョウ ヘンカ ソクテイ

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説明

Spatial distribution of mean particle diameter of cigarette main-stream cigarette smoke was measured immediately downstream of tobacco filters or tobacco column using an in-situ two-dimensional polarization-sensitive laser light scattering method. It was found that the mean particle diameter was about 0.2 μm and the spatial distribution was narrow. The mean particle diameter varied with the filter types and, therefore, the filters had different filtration efficiencies depending on the mean particle diameter. When main-stream smoke passed through a tobacco column of 5 mm to 40 mm in length from the char line, the number concentration decreased from 3 × 1010 to 1 × 1010 particles/cm3 and the mean particle diameter increased from 0.17 to 0.21 μm. Furthermore, we measured the filtration efficiency of a tobacco column using non-hygroscopic polystyrene latex particles with a low concentration, and found that the decrease in number concentration of main-stream smoke particles is similar to that measured for the test particles. Therefore, the major cause for the increase in main-stream smoke particles diameter with the length of tobacco column is not coagulation but condensation.

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