Abstract: The filter comprises a tobacco smoke filtration tube ensheathed in a layer of smoke pervious thermoplastic material. The layer is encased in a plugwrap. The layer has a transverse cross-section rendered impervious to smoke tobacco by use of an annular sealing groove. The tube is closed at a location spaced longitudinally from the groove by a V-shaped annular groove.

Abstract: Process for producing a filtering structure, in particular for cigarette filters from a fibrous mass comprising a homogeneous mixture of fibres of different types. Some of the fibres are necessarily thermofusible synthetic fibres having a low melting point and adhesive properties in the molten state, and the others are absorbent with respect to harmful products of tobacco smoke and stable at the melting temperature of the thermofusible fibres. The fibrous mixture is shaped into a cylindrical rod which is in state which is not yet coherent but homogeneous and comprises fibrous networks which are closely imbricated relative to each other.

Abstract: A smoke-filter rod comprises a body of rod form consisting or having as at least major constituent a thermoplastics cellulose acetate or polypropylene smoke-filtration material, preferably of a fibrous or filamentary nature, and wrapped in a plugwrap comprising at least 50%, suitably at least 90%, by weight of fibres or filaments of, respectively, cellulose acetate or polypropylene material of substantially the same chemical identity as said major constituent of the filtration material, said plugwrap being bonded to said body and having a permeability for air of not less than 10,000 Coresta units. The bonding is by an agent which is a bonding agent for the material of said plugwrap and said filtration material, suitably triacetin in the case of cellulose acetate. Portions of such filter rod can be subjected to a hot-shaping process.

Abstract: A method for manufacturing cigarette filters which have a well-stabilized shape in which acetate fibrous tows impregnated with carboxylic acid ester of polyol are formed into a predetermined shape, uniformly impregnated with water, and irradiated with microwave energy. Water is used during the application of microwave energy to enhance the absorption of microwave energy and hence heating of the filter. This causes the carboxylic acid ester of polyol to very rapidly disperse causing it to permeate into the acetate fiber to rapidly complete the stabilization and solidification of the filter.

Abstract: A tobacco smoke filter is disclosed, which provides tobacco flavor enrichment of smoke passing therethrough. The filter comprises a reconstituted tobacco member formed from a coherent sheet of reconstituted tobacco which has been uniformly embossed with a series of parallel grooves, and then compacted and bonded into a self-sustaining dimensionally stable axially elongated body whose longitudinal axis extends parallel to the embossed grooves. The embossed grooves provide the reconstituted tobacco member with flow passages having a high surface area for contact with smoke passing therethrough, so as to enable the smoke to become tobacco flavor-enriched by extracing tobacco flavor from the reconstituted tobacco.

Abstract: An improved cigaret filter wherein dry and active green algae in the form of chlorella in a granular or powdery form which can physically trap and remove such toxic substances contained in cigaret smoke as nicotine, tar, carbon monoxide and the like and, additionally, can biologically denature and change these substances to harmless form are carried or held by a carrier comprising a fibrous, continuous-cellular foamed or the like member. The filter is used as combined with a cigaret holder or directly with a cigaret. With each carrier, preferably, a total weight of 20 to 50 mg. of granular or powdery chlorella is used alone or as combined with such inorganic porous adsorbent as fine granular or powdery zeolite, silica gel, iron oxide or activated charcoal.

Abstract: The disclosure is of compositions useful for chemisorption of undesirable chemical compounds found in tobacco smoke. The compositions comprise a base of alumina (aluminum oxide) impregnated with various proportions of zinc acetate, acetic acid and polyethyleneimine. The compositions are usefully employed as chemical filter components and are particularly advantageous in that they have a capacity to remove large quantities of hydrogen cyanide and hydrogen sulfide from tobacco smoke while simultaneously removing acetaldehyde. Unexpectedly the smoking quality of cigarettes, to which the compositions may be associated, is not adversely affected. To the contrary, smoking quality of such cigarettes is improved.

Abstract: Magnetized active carbon composition consisting of active carbon and a magnetized ferromagnetic material mixed therewith has enhanced properties of active carbon, and may be used in order to remove carbon monoxide, hydrogen and nicotine from tobacco smoke and to control reactions in soil. The above properties are enhanced by applying a magnetic field and/or an electrostatic field to the magnetized active carbon.