Low ignition propensity cigarette paper and manufacture thereof

Abstract

A wrapper of a smoking article includes a base web and at least one transverse banded region. The banded region includes a first zone, a second zone and a third zone of add-on material. The second zone has about 25% to about 75% less add-on material than the first zone and the third zone. The banded region is about 5 mm to about 9 mm wide and the second zone is centrally located between the first zone and the third zone. The second zone includes a plurality of dots of the add-on material spaced from adjacent dots in the second zone by a distance greater than a distance between adjacent dots in the first zone and the third zone.

We claim: 
     
         1 . A wrapper for a smoking article, the wrapper comprising:
 a first layer having a first side and a second side, the first side opposing the second side; and   a second layer on the first side of the first layer, the second layer including,
 a first zone including a first amount of a first add-on material and having a first diffusivity, the first add-on material on the first side of the first layer being in a first pattern, and 
 a second zone including a second amount of a second add-on material and having a second diffusivity that is greater than the first diffusivity, the second add-on material on the first side of the first layer being in a second pattern different from the first pattern, and the second amount being 25% to 75% less than the first amount. 
   
     
     
         2 . The wrapper of  claim 1 , wherein the first layer includes flax, wood pulp, cellulose fiber, or a combination thereof. 
     
     
         3 . The wrapper of  claim 1 , wherein the first add-on material, the second add-on material, or both the first add-on material and the second add-on material includes an occluding agent. 
     
     
         4 . The wrapper of  claim 3 , wherein the occluding agent includes starch, alginate, cellulose, gum, or any combination thereof. 
     
     
         5 . The wrapper of  claim 1 , wherein the first add-on material, the second add-on material, or both the first add-on material and the second add-on material includes a filler material. 
     
     
         6 . The wrapper of  claim 5 , wherein the filler material includes calcium carbonate. 
     
     
         7 . The wrapper of  claim 1 , wherein the first add-on material, the second add-on material, or both the first add-on material and the second add-on material includes an anti-wrinkling agent. 
     
     
         8 . The wrapper of  claim 7 , wherein the anti-wrinkling agent includes 1,2-propylene glycol, propylene glycol, glycerin, starch plasticizing agents, or any combination thereof. 
     
     
         9 . The wrapper of  claim 1 , wherein the first pattern includes a plurality of first dots, at least a portion of each first dot of the plurality of first dots touching a portion of another first dot of the plurality of first dots. 
     
     
         10 . The wrapper of  claim 9 , wherein the second pattern includes a plurality of second dots, each second dot of the plurality of second dots being discrete and discontinuous. 
     
     
         11 . The wrapper of  claim 10 , wherein at least a portion of the plurality of second dots are hexagonal. 
     
     
         12 . The wrapper of  claim 9 , wherein each of the plurality of first dots has a larger average dimension than each of the plurality of second dots. 
     
     
         13 . The wrapper of  claim 1 , wherein the first diffusivity is between 0 and 0.1 cm/sec. 
     
     
       14. The wrapper of  claim 1 , wherein the second diffusivity is between 0.1 cm/sec and 0.4 cm/sec. 
     
     
         15 . The wrapper of  claim 1 , wherein the wrapper further includes a third zone, the third zone being the same as the first zone, the second zone between the first zone and the third zone. 
     
     
         16 . The wrapper of  claim 1 , wherein the wrapper further includes a third zone, the third zone including a third add-on material, the third add-on material on the first side of the first layer in a third pattern that is different from the second pattern. 
     
     
         17 . The wrapper of  claim 1 , wherein the wrapper further includes a third layer on the second side of the first layer, the third layer including one or more zones having one or more different patterns. 
     
     
         18 . The wrapper of  claim 1 , wherein the second layer has a permeability between 0 CORESTA and 12 CORESTA, and the first layer has a permeability greater than 60 CORESTA. 
     
     
         19 . The wrapper of  claim 1 , wherein the first zone has a greater basis weight in grams per square meter than the second zone. 
     
     
         20 . The wrapper of  claim 19 , wherein a basis weight in grams per square meter of the first zone is at least twice a basis weight in grams per square meter of the second zone.