Cigarette filter and filter-tipped cigarette

Abstract

A single-segment filter having a filter plug uses a high-rigidity and high-permeability paper longitudinal rigidity of which is 30 or higher as measured in accordance with JIS P8143 and air permeability of which is 1000 CORESTA units or greater as a filter plug wrapper wrapping a filter material, and a multisegment filter having a plurality of filter plugs uses the high-rigidity and high-permeability paper as a filter plug wrapper wrapping a filter material and/or a shaping paper joining plurality of filter plugs. A cigarette comprises the particular filter.

1 . A cigarette filter comprising:
 a filter plug comprising a cylindrical body of a filter plug wrapper which is cylindrically shaped and a filter material disposed in the cylindrical body,   wherein the filter plug wrapper is formed of a high-rigidity and high-permeability paper longitudinal rigidity of which is 30 or higher as measured in accordance with JIS P8143 and air permeability of which is 1000 CORESTA units or greater.   
     
     
         2 . The cigarette filter according to  claim 1 , wherein the filter plug contains activated charcoal particles. 
     
     
         3 . A cigarette filter comprising:
 a plurality of filter plugs comprising a most upstream filter plug and a most downstream filter plug, each comprising a cylindrical body of a filter plug wrapper which is cylindrically shaped and a filter material disposed in the cylindrical body; and   a shaping paper configured to wrap the circumference of the plurality of filter plugs and join the plurality of filter plugs to each other,   wherein the filter plug wrapper of at least one of the plurality of filter plugs is formed of a high-rigidity and high-permeability paper longitudinal rigidity of which is 30 or higher as measured in accordance with JIS P8143 and air permeability of which is 1000 CORESTA units or greater.   
     
     
         4 . The cigarette filter according to  claim 3 , wherein the shaping paper is formed of the high-rigidity and high-permeability paper. 
     
     
         5 . A cigarette filter comprising:
 a plurality of filter plugs comprising a most upstream filter plug and a most downstream filter plug, each comprising a cylindrical body of filter plug wrapper which is cylindrically shaped and a filter material disposed in the cylindrical body; and   a shaping paper configured to wrap the circumference of the plurality of filter plugs and join the plurality of filter plugs to each other,   wherein the shaping paper is formed of a high-rigidity and high-permeability paper longitudinal rigidity of which is 30 or higher as measured in accordance with JIS P8143 and air permeability of which is 1000 CORESTA units or greater.   
     
     
         6 . The cigarette filter according to  claim 3 , wherein a filter plug disposed upstream of the most downstream filter plug contains activated charcoal particles. 
     
     
         7 . The cigarette filter according to  claim 1 , wherein the longitudinal rigidity of the high-rigidity and high-permeability paper is in the range of 30 to 400 and the air permeability of the paper is in the range of 1000 to 30,000 CORESTA units. 
     
     
         8 . The cigarette filter according to  claim 1 , wherein the filter material of the filter plug having the high-rigidity and high-permeability paper is formed of cellulose acetate fiber tow in which a plasticizer is mixed in a ratio of 0% to less than 5% based on the weight of the fiber tow. 
     
     
         9 . The cigarette filter according to  claim 1 , wherein the filter material of the filter plug having the high-rigidity and high-permeability paper is formed of cellulose acetate fiber tow in which a plasticizer is mixed in a ratio of 5 to 10% based on the weight of the fiber tow. 
     
     
         10 . The cigarette filter according to  claim 1 , wherein the filter material of the filter plug having the high-rigidity and high-permeability paper is formed of cellulose acetate fiber tow in which a plasticizer is mixed in a ratio of more than 10% but 12% or less based on the weight of the fiber tow. 
     
     
         11 . The cigarette filter according to  claim 1 , wherein the filter material does not contain any hardness increasing agent. 
     
     
         12 . The cigarette filter according to  claim 11 , wherein the filter material contains a paper. 
     
     
         13 . The cigarette filter according to  claim 1 , further comprising a flavor. 
     
     
         14 . The cigarette filter according to  claim 13 , wherein the flavor contains menthol. 
     
     
         15 . The cigarette filter according to  claim 1 , wherein the cylindrical body is extended out of the downstream end face of the filter material so as to provide a recess portion. 
     
     
         16 . The cigarette filter according to  claim 3 , wherein the shaping paper is extended out of the downstream end face of the most downstream filter plug so as to provide a recess portion. 
     
     
         17 . A filter-tipped cigarette comprising:
 a cigarette main body comprising a tobacco rod wrapped with a cigarette paper; and   a cigarette filter fitted to one end of the cigarette main body,   wherein the cigarette filter is formed of the cigarette filter of  claim 1 .