TOBACCO SMOKE FILTER AND METHODS OF ITS PRODUCTION Russian patent published in 2012 - IPC A24D3/04 

FIELD: tobacco industry.

SUBSTANCE: tobacco smoke filter has a cylindric cover containing a spiral element with diameter approximately equal to the inner diameter of the cover as well as filtering means placed between the spiral element and the cover. The spiral element contacts the cover to the its inner diameter and is made by means of sideward compressing with the ability to maintain the contact after the compression. Filter production requires the preparation of the cylindric spiral having the inner space inside the spiral volute and outer edge making a cylindrical form. In the specified inner space filter means are located along with wrapped outer edge of the filled spiral cover. Spiral element is used sidewards thus providing its contact with the cover which is preserved after the spiral element copression.

EFFECT: this filter provides the increased contact time with the filtering material and expanded space of the filtering material contact surface.

15 cl, 13 dwg