| 摘要 |
A ventilated tobacco smoke filter whose retention of particulate matter is due more to air dilution than to mechanical filtration comprises a ventilating wrapper around a rod providing a multiplicity of capillaries extending longitudinally of the rod and formed by a bundle of coarse filaments extending longitudinally of the rod or by longitudinally corrugated and/or at least partially fibrillated sheet, film or foil of zero or low smoke permeability material gathered laterally into rod form. |
