Smoking article

Abstract

A smoking article 10 comprises a source of smokable material 11 , a filter 12 , a first layer 13 surrounding at least a part of the filter 12 , a second layer 14 surrounding at least a part of the first layer 13 and one or more paths 15 for ventilating air flow between the first and second layers 13, 14 . A part of the first layer 13 surrounds the source of smokable material 11 and is for attaching the filter 12 thereto.

1 . A smoking article comprising a source of smokable material, a filter, a first layer surrounding at least a part of the filter, a second layer surrounding at least a part of the first layer, and at least one path for ventilating air flow between the first and second layers, wherein a part of the first layer surrounds the source of smokable material and attaches the filter thereto. 
     
     
         2 . A smoking article comprising a source of smokable material, a filter, a first layer surrounding at least a part of the filter, a second layer surrounding at least a part of the first layer, and at least one path for ventilating air flow between the first and second layers, wherein at least a part of the at least one path is located further from an axis of the smoking article than any part of the filter or of the source of smokable material. 
     
     
         3 . The smoking article according to  claim 1 , wherein at least a part of the first layer comprises an irregular outer surface that defines, together with the second layer, the at least one path. 
     
     
         4 . The smoking article according to  claim 3 , wherein the irregular outer surface comprises a plurality of elongate ridges extending generally along the filter, the at least one path being at least partially located between adjacent ridges. 
     
     
         5 . The smoking article according to  claim 1 , wherein the first layer comprises a part with a smooth inner surface that surrounds a part of the source of smokable material or surrounds adjacent parts of the source of smokable material and of the filter. 
     
     
         6 . The smoking article according to  claim 1 , wherein the at least one path has at least one air inlet that is located one of near to and beyond an end of the filter nearest to the source of smokable material, the at least one air inlet defined by extents of the first and the second layers one of towards and beyond the end of the filter. 
     
     
         7 . The smoking article according to  claim 1 , wherein the at least one path has at least one air outlet located near to an end of the filter furthest from the source of smokable material, the at least one air outlet defined by extents of the first and the second layers one of towards and beyond the end of the filter. 
     
     
         8 . The smoking article according to  claim 1 , wherein the at least one path has at least one air outlet into the filter, the at least one air outlet into the filter defined by an extent of the first covering layer towards an end of the filter furthest from the source of smokable material, and wherein the second layer extends one of to and near to the end of the filter. 
     
     
         9 . The smoking article according to  claim 8 , wherein the filter is longitudinally divided into first and second filter parts, the first layer extending one of to and near to the end of the first filter part furthest from the source of smokable material, and wherein the second layer extends one of to and near to the end of the second filter part furthest from the source of smokable material. 
     
     
         10 . The smoking article according to  claim 1 , wherein at least one of the first layer and the second layer is formed from a sheet material. 
     
     
         11 . A method of manufacturing a smoking article, the method comprising providing a source of smokable material, providing a filter, surrounding at least a part of the filter with a first layer, surrounding at least a part of the first layer with a second layer, and forming at least one path for ventilating air flow between the first and second layers, wherein a part of the first layer surrounds the source of smokable material and is configured to attach the filter thereto, or wherein at least a part of the one or more paths is located further from an axis of the smoking article than any part of the filter or of the source of smokable material. 
     
     
         12 . The method according to  claim 11 , further comprising forming an irregular outer surface on at least a part of the first layer, the irregular outer surface defining, together with the second layer, the at least one path. 
     
     
         13 . The method according to  claim 12 , wherein the first layer is formed from a sheet material, and wherein forming the irregular outer surface comprises embossing the sheet material. 
     
     
         14 . The method according to  claim 11 , comprising providing a first filter part, surrounding at least a part of the first filter part with the first layer, providing a second filter part adjacent to the first filter part, and surrounding at least a part of the first layer and at least a part of the second filter part with the second layer. 
     
     
         15 . (canceled) 
     
     
         16 . The smoking article according to  claim 2 , wherein at least a part of the first layer comprises an irregular outer surface that defines, together with the second layer, the at least one path. 
     
     
         17 . The smoking article according to  claim 16 , wherein the irregular outer surface comprises a plurality of elongate ridges extending generally along the filter, the at least one path being at least partially located between adjacent ridges. 
     
     
         18 . The smoking article according to  claim 2 , wherein the first layer comprises a part with a smooth inner surface that surrounds a part of the source of smokable material or surrounds adjacent parts of the source of smokable material and of the filter. 
     
     
         19 . The smoking article according to  claim 2 , wherein the at least one path has at least one air inlet that is located one of near to and beyond an end of the filter nearest to the source of smokable material, the at least one air inlet defined by extents of the first and the second layers one of towards and beyond the end of the filter. 
     
     
         20 . The smoking article according to  claim 2 , wherein the at least one path has at least one air outlet located near to an end of the filter furthest from the source of smokable material, the at least one air outlet defined by extents of the first and the second layers one of towards and beyond the end of the filter. 
     
     
         21 . The smoking article according to  claim 2 , wherein the at least one path has at least one air outlet into the filter, the at least one air outlet into the filter defined by an extent of the first covering layer towards an end of the filter furthest from the source of smokable material, and wherein the second layer extends one of to and near to the end of the filter. 
     
     
         22 . The smoking article according to  claim 21 , wherein the filter is longitudinally divided into first and second filter parts, the first layer extending one of to and near to the end of the first filter part furthest from the source of smokable material, and wherein the second layer extends one of to and near to the end of the second filter part furthest from the source of smokable material. 
     
     
         23 . The smoking article according to  claim 2 , wherein at least one of the first layer and the second layer is formed from a sheet material.