Smoking article

Abstract

A smoking article is described in which the smoking article comprises tobacco material wrapped in a paper wrapper to form a tobacco rod, and wherein the paper wrapper has a diffusivity of between about 0.1 cm/s and 0.5 cm/s and a permeability of less than about 15 CU, and a method of manufacturing the smoking article is described.

1 . A smoking article comprising:
 tobacco material wrapped in a paper wrapper to form a tobacco rod; and   wherein the paper wrapper has a diffusivity of between about 0.1 cm/s and 0.5 cm/s and a permeability of less than about 15 CU.   
     
     
         2 . The smoking article according to  claim 1 , wherein the paper wrapper has a diffusivity of between about 0.1 cm/s and 0.3 cm/s. 
     
     
         3 . The smoking article according to  claim 1 , wherein the paper wrapper has a diffusivity of between about 0.15 and about 0.25, between about 0.15 and about 0.20, or between about 0.17 and about 0.22 cm/s. 
     
     
         4 . The smoking article according to  claim 1 , wherein the paper wrapper has a permeability of less than about 15 CU over at least 50% of the surface area of the paper wrapper. 
     
     
         5 . The smoking article according to  claim 4 , wherein the paper wrapper has a permeability of between about 4 and about 12 CU. 
     
     
         6 . The smoking article according to  claim 4 , wherein the paper wrapper has a permeability of between about 4 and about 12 CU over at least 90% of the surface area of the paper wrapper. 
     
     
         7 . The smoking article according to  claim 1 , wherein the paper wrapper has a permeability of less than about 10 CU, or between about 3 and about 7 CU, over at least 90% of the surface area of the paper wrapper. 
     
     
         8 . The smoking article according to  claim 1 , further comprising a filter. 
     
     
         9 . The smoking article according to  claim 8 , wherein a pressure drop across the filter is between about 40 mm water gauge (WG) and 180 mm WG. 
     
     
         10 . The smoking article according to  claim 8 , wherein the filter comprises a ventilation area. 
     
     
         11 . The smoking article according to  claim 10 , wherein the ventilation area provides ventilation of between 40% and 90%. 
     
     
         12 . The smoking article according to  claim 8 , wherein the filter comprises filter material having a denier per filament of between 2.5 and 9. 
     
     
         13 . The smoking article according to  claim 8 , wherein the filter comprises filter material having a total denier of between 10,000 and 32,000. 
     
     
         14 . The smoking article according to  claim 1 , wherein the paper wrapper has a basis weight of between 24 and 36 g/m 2 . 
     
     
         15 . The smoking article according to  claim 14 , wherein the paper wrapper has a basis weight of between 27 and 32 g/m 2 . 
     
     
         16 . The smoking article according to  claim 15 , wherein the paper wrapper has a basis weight of about 28 g/m 2 . 
     
     
         17 . The smoking article according to  claim 15 , wherein the paper wrapper has a basis weight of about 32 g/m 2 . 
     
     
         18 . The smoking article according to  claim 1 , wherein the paper wrapper includes less than 30% filler by weight of the paper wrapper. 
     
     
         19 . The smoking article according to  claim 18 , wherein the paper wrapper includes between 15 and 25% filler by weight. 
     
     
         20 . The smoking article according to  claim 18 , wherein the filler comprises calcium carbonate. 
     
     
         21 . The smoking article according to  claim 1 , wherein the paper wrapper has an opacity of between 60% and 80%, or between 68% and 80%. 
     
     
         22 . The smoking article according to  claim 1 , wherein the paper wrapper comprises less than 4% burn additive by weight of the paper wrapper. 
     
     
         23 . The smoking article according to  claim 22 , wherein the paper wrapper comprises about 1% burn additive by weight. 
     
     
         24 . The smoking article according to  claim 22 , wherein the burn additive is sodium citrate, potassium citrate, or a mixture of sodium citrate and potassium citrate. 
     
     
         25 . A method of manufacturing a smoking article, the method comprising:
 forming a tobacco rod by wrapping tobacco material in a paper wrapper having a diffusivity of between about 0.1 cm/s and 0.5 cm/s and a permeability of less than about 15 CU.   
     
     
         26 . The method of manufacturing a smoking article according to  claim 25 , further comprising a filter to said tobacco rod. 
     
     
         27 . The method of manufacturing a smoking article according to  claim 26 , further comprising providing a ventilation area for allowing ventilation into said filter. 
     
     
         28 . The method of manufacturing a smoking article according to  claim 25 , wherein the paper wrapper has a diffusivity of between about 0.1 cm/s and 0.3 cm/s. 
     
     
         29 . The method of manufacturing a smoking article according to  claim 25 , wherein the paper wrapper has a permeability of between about 4 and about 12 CU over at least 50% of the surface area of the wrapper. 
     
     
         30 . The method of manufacturing a smoking article according to  claim 25 , wherein the paper wrapper has a permeability of between about 4 and about 12 CU over at least 90% of the surface area of the wrapper.