Filter, an aerosol-generating article comprising the same, and a method of manufacturing the filter

Abstract

A filter included in an aerosol-generating article, according to embodiments, includes a first filter segment including a first filter element in which at least one heterogeneous material particle is contained, a second filter segment including a second filter element, and a wrapper wrapping the first filter segment and the second filter segment, wherein the first filter segment and the second filter segment are aligned in a longitudinal direction of the filter, and the first filter segment and the second filter segment are not physically separated.

1 . A filter included in an aerosol-generating article, the filter comprising:
 a first filter segment including a first filter element in which at least one heterogeneous material particle is contained;   a second filter segment including a second filter element; and   a wrapper wrapping the first filter segment and the second filter segment,   wherein the first filter segment and the second filter segment are aligned in a longitudinal direction of the filter, and   the first filter segment and the second filter segment are not physically separated.   
     
     
         2 . The filter of  claim 1 , wherein the heterogeneous material particle is at least one selected from a group consisting of activated carbon particles and tobacco particles. 
     
     
         3 . The filter of  claim 1 , wherein
 the heterogeneous material particle includes activated carbon particles, and   the first filter segment filter includes the activated carbon particles of 0.5 mg/mm to 5 mg/mm in the longitudinal direction of the filter.   
     
     
         4 . The filter of  claim 1 , wherein the heterogeneous material particle has a diameter of 0.1 to 0.7 mm. 
     
     
         5 . The filter of  claim 1 , wherein the first filter segment and the second filter segment have a length ratio of 1:0.5 to 1.5 in the longitudinal direction of the filter. 
     
     
         6 . The filter of  claim 1 , wherein the wrapper includes at least one perforation. 
     
     
         7 . An aerosol-generating article comprising the filter of  claim 1 . 
     
     
         8 . A filter manufacturing method comprising:
 a first operation of transporting a filter tow in one direction;   a second operation of manufacturing a filter tow into which at least one heterogeneous material particle is injected at a preset length interval by injecting the heterogeneous material particle with a preset weight into the filter tow being transported at a preset period;   a third operation of wrapping the filter tow into which the heterogeneous material particle is injected at the preset length interval with a wrapper; and   a fourth operation of cutting the filter tow wrapped with the wrapper into filters each including the heterogeneous material particle.   
     
     
         9 . The filter manufacturing method of  claim 8 , wherein the heterogeneous material particle is selected from a group consisting of activated carbon particles and tobacco particles. 
     
     
         10 . The filter manufacturing method of  claim 8 , wherein
 the heterogeneous material particle includes activated carbon particles, and   the preset weight is 0.5 mg/mm to 5 mg/mm in a longitudinal direction of the filter tow.   
     
     
         11 . The filter manufacturing method of  claim 8 , wherein the heterogeneous material particle has a diameter of 0.1 to 0.7 mm. 
     
     
         12 . The filter manufacturing method of  claim 8 , wherein the preset length interval is 5 to 30 mm. 
     
     
         13 . The filter manufacturing method of  claim 8 , wherein the second operation includes
 an operation of manufacturing the filter tow into which the at least one heterogeneous material particle is injected at the preset length interval by injecting at least one heterogeneous material particle with the preset weight into the filter tow being transported at the preset period, and   an operation of causing the filter tow into which the at least one heterogeneous material particle is injected at the preset length interval to pass through a compressor and compressing the filter tow.   
     
     
         14 . The filter manufacturing method of  claim 8 , wherein the second operation includes
 an operation of manufacturing a compressed filter tow by passing the filter tow through the compressor,   an operation of manufacturing the filter tow into which the at least one heterogeneous material particle is injected at the preset length interval by injecting the heterogeneous material particle with the preset weight into the filter tow being transported at the preset period, and   an operation of dispersing the heterogeneous material particle into the filter tow by spraying gas to the filter tow into which the heterogeneous material particle is injected at the preset length interval.   
     
     
         15 . The filter manufacturing method of  claim 8 , further comprising:
 a fifth operation of forming at least one perforation in the wrapper.