TOBACCO FILTER Russian patent published in 2016 - IPC A24D3/04 

FIELD: tobacco industry.

SUBSTANCE: present invention relates to filters and filtration elements for smoking materials, such as a cigarette. Tobacco filter or filter element comprises extending in longitudinal direction of a core containing material filtering tobacco smoke, outer wrapper attached around said core, wherein said core has one or more channels passing in longitudinal direction upstream from downstream end of core, wherein said core comprises a hollow tube made from tobacco smoke filtering material, which does not pass along whole length of core or said core comprises downstream element including extending in lengthwise direction of tube with spaced apart ribs passing in whole inside to passing in longitudinal direction of internal main part, wherein ribs make longitudinal channels with each other or said core comprises downstream element including extending in lengthwise direction downstream core made from tobacco smoke filtering material first air-permeable inner wrap attached around downstream of core, and, optionally, second inner wrap is attached around first internal cover, wherein said first inner wrap has shaped (for example, corrugated) outer surface, which together with second inner wrap or outer wrap forms at least one longitudinal channel which passes in longitudinal direction upstream from downstream end located downstream of core, and which passes only part of length of downstream of core, downstream end outer wrapper and/or downstream end of first inner wrapper extends beyond downstream end of core around which it is connected, to form a cavity on downstream end of filter.

EFFECT: technical result is exclusion of forgery of cigarettes.

16 cl, 4 dwg