Tobacco smoke filters

AHUMAN NECESSITIES A24Tobacco products A24DCIGARS CIGARETTES TOBACCO SMOKE FILTERS MOUTHPIECES FOR CIGARS OR CIGARETTES MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES

A24D3/00Tobacco smoke filters

A24D3/02Manufacture of tobacco smoke filters A24D3/0204Preliminary operations before the filter rod forming process A24D3/0208Cutting filter materials A24D3/0212Applying additives to filter materials A24D3/0216the additive being in the form of capsules, beads or the like A24D3/022with liquid additives A24D3/0225with solid additives A24D3/0229Filter rod forming processes A24D3/0233by means of a garniture A24D3/0237by extrusion A24D3/0241by compacting particulated materials A24D3/0245by winding A24D3/025Final operations A24D3/0254Cutting means A24D3/0258Means for making grooves A24D3/0262Filter extremity shaping and compacting means A24D3/0266Rolling means A24D3/027Multiple line manufacturing devices A24D3/0275for filters with special features A24D3/0279with tubes A24D3/0283with means for a non-axial smoke flow A24D3/0287for composite filters A24D3/0291for hollow tipped filters A24D3/0295Process control means A24D3/04Tobacco smoke filters characterised by their shape or structure A24D3/041with adjustable means for modifying the degree of filtration of the filter A24D3/043with ventilation means A24D3/045with smoke acceleration means A24D3/046with electrical or magnetical filtering means A24D3/048containing additives A24D3/06Use of materials for tobacco smoke filters A24D3/061containing additives entrapped within capsules, sponge-like material or the like, for further release upon smoking A24D3/062characterised by structural features A24D3/063of the fibers A24D3/064having non-circular cross-section A24D3/065with sheath/core of bi-component type structure A24D3/066in the form of foam or having cellular structure A24D3/067characterised by functional properties A24D3/068Biodegradable or disintegrable A24D3/08of organic materials as carrier or major constituent A24D3/10of cellulose or cellulose derivatives A24D3/12of ion exchange materials A24D3/14of organic materials as additive A24D3/145Microbial metabolite A24D3/16of inorganic materials A24D3/163Carbon A24D3/166Silicic acid or silicates A24D3/18Mouthpieces for cigars or cigarettes Manufacture thereof A24D3/185with a straw-like insert