SMOKING PRODUCT FILTER Russian patent published in 2014 - IPC A24D3/04 

FIELD: tobacco industry.

SUBSTANCE: invention relates to a smoking product filter containing an elongated base part of the filtering material, an internal wrapper (having the first and the second areas of a non-porous material positioned around and with an interval along the filtering material length with formation of clearance acting as a ventilation zone) and an external wrapper positioned over the internal wrapper and designed so that ventilating air may be drawn through the ventilation zone and passed into the filtering material through the external wrapper and in a longitudinal direction between the internal and the external wrappers.

EFFECT: ensuring smoking product ventilation.

25 cl, 16 dwg