Filter for a smoking article
AssigneeBritish American Tobacco (Investments) Limited
InventorsPeter Branton, Martin Duke, Stephen Tennison, Dinah Blanche Winter
Life of this patent
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Abstract
A filter for a smoking article comprises a monolith. The monolith is produced forming particles of a partially cured resin into a dough, shaping the dough to produce a monolith, sintering the particles, carbonizing and activating the sintered monolith, and incorporating the monolith into a smoking article filter.
Claims23
A smoking article filter comprising a monolith circumscribed by a plugwrap, wherein the monolith comprises carbonized sintered resin and is configured such that a pressure drop of the filter does not significantly increase with monolith length.
A smoking article filter comprising a monolith circumscribed by a plugwrap, wherein the monolith comprises a plurality of cells, each cell comprising a channel that extends through the monolith, the combined cross sectional surface area of the channels comprising 30-40% of the total cross sectional surface area of the monolith, and the monolith configured such that a pressure drop of the filter does not significantly increase with monolith length.
A smoking article filter, comprising:
- a monolith, the monolith configured such that a pressure drop of the filter does not significantly increase with monolith length, wherein the monolith comprises a plurality of cells, each cell comprising a channel that extends through the monolith, and wherein, in cross section, the monolith comprises 180-310 cells per square centimeter, and wherein the monolith has a pore volume of 0.4 to 1.5 cm3/g as estimated by nitrogen adsorption.
A method of manufacturing a smoking article filter, comprising:
- comminuting a partially cured resin to form particles of the partially cured resin;
- forming particles of the partially cured resin into a dough and shaping the dough to produce a monolith;
- sintering the particles of the monolith to form a sintered monolith;
- carbonizing and activating the sintered monolith;
- and
- incorporating the activated sintered monolith into a smoking article filter configured such that a pressure drop of the filter does not significantly increase with monolith length.
Dependencies are inferred from the claim text.