Combustible carbon filter and smoking product

Claim 1

A method of making a combustible carbonized rod for use in a smoking product comprising: contacting cellulosic paper made by the wet papermaking process with an aqueous solution of a binding agent; repeatedly folding the wet paper along its longitudinal axis to form a substantially cylindrical bundle; advancing the substantially cylindrical bundle through a heated die to remove the water and produce a coherent cellulose rod which maintains its integrity in the absence of any external wrapping, said die being selected such that the cellulose rod emerging therefrom has a diameter of at least about 11 mm; treating the resulting unwrapped cellulose rod with an additive selected from the group consisting of Na 2 B 4 O 7 , CaCl 2 , K 4 Fe(CN) 6 , Al 2 (SO 4 ) 3 and Cu 2 SO 4 and mixtures thereof so that the treated cellulose rod contains from about 1% to about 5% by weight of the additive on a dry weight basis; pyrolyzing the treated cellulose rod by advancing said treated cellulose rod through a die maintained at a temperature within the range of from about 500° C. to about 1000° C. in an oxygen-free atmosphere for a total retention time in the die of from about 3 seconds to about 1 minute, said die being selected such that the pyrolyzed rod emerging therefrom has a diameter of from about 7 mm to about 9 mm; and cooling the pyrolyzed rod to less than about 250° C. before removing the pyrolyzed rod from the oxygen-free atmosphere.

Claim 2

A method of making a combustible carbonized rod for use in a smoking product comprising: contacting cellulosic paper made by the wet papermaking process with an aqueous solution of a binding agent; repeatedly folding the wet paper along its longitudinal axis to form a substantially cylindrical bundle; advancing the substantially cylindrical bundle through a heated die to remove the water and produce a coherent cellulose rod which maintains its integrity in the absence of any external wrapping, said die being selected such that the cellulose rod emerging therefrom has a diameter of at least about 11 mm; treating the resulting unwrapped cellulose rod with an additive selected from the group consisting of Na 2 B 4 O 7 , CaCl 2 , K 4 Fe(CN) 6 , Al 2 (SO 4 ) 3 and Cu 2 SO 4 and mixtures thereof so that the treated cellulose rod contains from about 1% to about 5% by weight of the additive on a dry weight basis; pyrolyzing the treated cellulose rod by advancing said treated cellulose rod through a die maintained at a temperature within the range of from about 500° C. to about 1000° C. in an oxygen-free atmosphere for a total retention time in the die of from about 3 seconds to about 1 minute, said die being selected such that the pyrolyzed rod emerging therefrom has a diameter of from about 7 mm to about 9 mm; and cooling the pyrolyzed rod to less than about 250° C. before removing the pyrolyzed rod from the oxygen-free atmosphere.

Claim 14

A method of making a combustible carbonized rod for use in a smoking product comprising: contacting cellulosic paper made by the wet paper-making process with an aqueous solution of an additive selected from the group of compounds consisting of Na 2 B 4 O 7 , CaCl 2 , K 4 Fe(CN) 6 , Al 2 (SO 4 ) 3 and Cu 2 SO 4 and mixtures thereof so that the paper contains from about 1% to about 5% by weight of the additive on a dry weight basis, repeatedly folding the wet paper along its longitudinal axis to form a substantially cylindrical bundle, advancing the substantially cylindrical bundle through a heated die to remove the water and produce a coherent cellulose rod which maintains its integrity in the absence of any external wrapping, said die being selected such that the cellulose rod emerging therefrom has a diameter of at least about 11 mm, pyrolyzing the treated cellulose rod by advancing said treated cellulose rod through a die maintained at a temperature within the range of from about 500° C. to about 1000° C. in an oxygen-free atmosphere for a total retention time in the die of from about 3 seconds to about 1 minute, said die being selected such that the pyrolyzed rod emerging therefrom has a diameter of from about 7 mm to about 9 mm, and cooling the pyrolyzed rod to less than about 250° C. before removing the pyrolyzed rod from the oxygen-free atmosphere.

Claim 15

A method of making a combustible carbonized rod for use in a smoking product comprising: contacting cellulosic paper made by the wet paper-making process with an aqueous solution of an additive selected from the group of compounds consisting of Na 2 B 4 O 7 , CaCl 2 , K 4 Fe(CN) 6 , Al 2 (SO 4 ) 3 and Cu 2 SO 4 and mixtures thereof so that the paper contains from about 1% to about 5% by weight of the additive on a dry weight basis, repeatedly folding the wet paper along its longitudinal axis to form a substantially cylindrical bundle, advancing the substantially cylindrical bundle through a heated die to remove the water and produce a coherent cellulose rod which maintains its integrity in the absence of any external wrapping, said die being selected such that the cellulose rod emerging therefrom has a diameter of at least about 11 mm, pyrolyzing the treated cellulose rod by advancing said treated cellulose rod through a die maintained at a temperature within the range of from about 500° C. to about 1000° C. in an oxygen-free atmosphere for a total retention time in the die of from about 3 seconds to about 1 minute, said die being selected such that the pyrolyzed rod emerging therefrom has a diameter of from about 7 mm to about 9 mm, and cooling the pyrolyzed rod to less than about 250° C. before removing the pyrolyzed rod from the oxygen-free atmosphere.