Tobacco filter and smoking article including same

Abstract

Disclosed is a tobacco filter with an excellent exterior appearance. The tobacco filter includes a paper sheet including a pulp fiber, wherein the paper sheet has a bulk in a range of 2 to 4 cm 3 /g, and the pulp fiber includes at least one of a single fiber having an average coarseness of 13 mg/100 m or higher and a mixed fiber including a sub-pulp fiber and a regenerated fiber.

What is claimed is: 
     
         1 . A tobacco filter comprising a paper sheet comprising a pulp fiber,
 wherein the paper sheet has a bulk in a range of 2 to 4 cm 3 /g, and   the pulp fiber comprises at least one of:
 a single fiber having an average coarseness of 13 mg/100 m or higher; and 
 a mixed fiber comprising a sub-pulp fiber and a regenerated fiber. 
   
     
     
         2 . The tobacco filter of  claim 1 , wherein the single fiber is included in an amount of 70 wt % or more based on the total weight of the paper sheet. 
     
     
         3 . The tobacco filter of  claim 1 , wherein the sub-pulp fiber comprises a pulp fiber derived from an evergreen. 
     
     
         4 . The tobacco filter of  claim 1 , wherein a weight ratio of the sub-pulp fiber to the regenerated fiber is in a range of 9:1 to 5:5. 
     
     
         5 . The tobacco filter of  claim 1 , wherein the pulp fiber has an average length in a range of 2 to 6 mm. 
     
     
         6 . The tobacco filter of  claim 1 , wherein the paper sheet has an air permeability in a range of 500 to 10,000 CU. 
     
     
         7 . A smoking article comprising:
 a first part comprising a medium; and   a second part comprising a filter element,   wherein the filter element comprises the tobacco filter of  claim 1 .   
     
     
         8 . The smoking article of  claim 7 , further comprising a third part interposed between the first and second parts,
 wherein the third part comprises a first cooling element or a tube filter.   
     
     
         9 . The smoking article of  claim 8 , further comprising a fourth part placed on one side of the first part,
 wherein at least one of the second and fourth parts comprises the paper sheet.   
     
     
         10 . The smoking article of  claim 9 , wherein the second part comprises the paper sheet. 
     
     
         11 . The smoking article of  claim 9 , wherein the second and fourth parts comprise the paper sheet. 
     
     
         12 . The smoking article of  claim 9 , wherein the fourth part comprises a second cooling element.