Smoking articles and wrapping materials therefor

Abstract

A smoking article includes a smokable rod manufactured using a paper wrapping material having an additive material applied thereto as a pattern. The additive material is applied as coating formulation (e.g., an aqueous coating formulation) incorporating a film-forming agent such as alginate, starch, or another polymer. The wrapping material includes at least one coated region with a porosity of less than about 20 CORESTA and a diffusion capacity no greater than about 0.2 cm/sec, where the coated region is on a base sheet with a porosity of greater than about 120 CORESTA and a diffusion capacity of at least 1.7 cm/sec.

1 . A wrapping material for a smoking article, the wrapping material comprising a base sheet and an additive material disposed on at least one major surface thereof in a pattern forming at least one coated region, where the additive material is configured to reduce a porosity of the base sheet, so as to reduce its ignition propensity in the coated region;
 wherein the at least one coated region comprises a porosity of less than about 20 CORESTA and a diffusion capacity no greater than about 0.2 cm/sec;   wherein the base sheet comprises a porosity of greater than about 120 CORESTA and a diffusion capacity of at least 1.7 cm/sec; and   wherein the base sheet comprises an ash conditioner.   
     
     
         2 . The wrapping material of  claim 1  wherein the at least one coated region comprises a porosity of less than about 10 CORESTA. 
     
     
         3 . The wrapping material of  claim 1  wherein the at least one coated region comprises a porosity of less than about 5 CORESTA. 
     
     
         4 . The wrapping material of  claim 1  wherein the at least one coated region comprises a diffusion capacity less than about 0.1 cm/sec . 
     
     
         5 . The wrapping material of  claim 1  wherein the at least one coated region comprises a diffusion capacity less than about 0.09 cm/sec. 
     
     
         6 . The wrapping material of  claim 1  wherein the base sheet comprises a porosity of greater than about 130 CORESTA. 
     
     
         7 . The wrapping material of  claim 1  wherein the base sheet comprises a porosity of greater than about 150 CORESTA. 
     
     
         8 . The wrapping material of  claim 1  wherein the base sheet comprises a porosity of at least about 200 CORESTA. 
     
     
         9 . The wrapping material of  claim 1  wherein the ash conditioner consists essentially of a non-sodium metal citrate. 
     
     
         10 . The wrapping material of  claim 1  wherein the ash conditioner consists essentially of potassium citrate. 
     
     
         11 . The wrapping material of  claim 10 , wherein the potassium citrate is present on a dry weight basis at about 0.4% to about 1%. 
     
     
         12 . The wrapping material of  claim 1  wherein the base sheet comprises a diffusion capacity of at least about 1.9 cm/sec. 
     
     
         13 . The wrapping material of  claim 1  wherein the base sheet comprises a diffusion capacity of at least about 2.2 cm/sec. 
     
     
         14 . A smoking article comprising the wrapping material of any of  claims 1 ,  2 ,  5 ,  7 ,  8 , or  10 . 
     
     
         15 . A wrapping material for a smoking article, the wrapping material comprising a base sheet and an additive material disposed on at least one major surface thereof in a pattern forming at least one coated region, where the additive material is configured to reduce a porosity of the base sheet, so as to reduce its ignition propensity in the coated region;
 wherein the at least one coated region comprises a porosity of less than about 10 CORESTA and a diffusion capacity less than about 0.2 cm/sec;   wherein the base sheet comprises a porosity of greater than about 150 CORESTA and a diffusion capacity of at least 2 cm/sec; and   wherein the base sheet comprises a non-sodium metal citrate ash conditioner.   
     
     
         16 . A smoking article comprising the wrapping material of  claim 15 .