Smoking article filter for easy extinguishing

Abstract

There is provided a smoking article comprising a tobacco rod, a filter and tipping material attaching the tobacco rod and the filter. The filter comprises a plug of filtration material that defines a furthest downstream end of the smoking article, the plug being surrounded by one or more filter wrappers. The tipping material includes a ventilation zone. The tipping material and the filter wrapper or wrappers have a combined thickness (t) perpendicular to the longitudinal direction of the smoking article, and the smoking article, at a location about the plug of filtration material, has a diameter (D SA ) perpendicular to the longitudinal direction of the smoking article. The diameter (D SA ) to thickness (t) ratio is less than about 80 and the filtration material extends to the furthest downstream end of the smoking article.

1 - 15 . (canceled) 
     
     
         16 . A smoking article comprising:
 a tobacco rod;   a filter comprising a plug of filtration material, the plug being surrounded by one or more filter wrappers; and   tipping material attaching the tobacco rod and the filter, the tipping material including a ventilation zone;   wherein the tipping material and the filter wrapper or wrappers have a combined thickness (t) perpendicular to the longitudinal direction of the smoking article;   wherein the smoking article, at a location about the plug of filtration material, has a diameter (D SA ) perpendicular to the longitudinal direction of the smoking article;   wherein the diameter (D SA ) to thickness (t) ratio is less than about 80;   wherein the ventilation zone comprises perforations through the tipping material; and   wherein the perforations extend through the one or more filter wrappers,   and wherein the filter has a critical load from 30 Newtons to 80 Newtons.   
     
     
         17 . A smoking article according to  claim 16 , wherein the ventilation zone provides between about 10% and about 80% ventilation of the mainstream smoke. 
     
     
         18 . A smoking article according to  claim 16 , wherein the one or more filter wrappers have a porosity of less than about 500 Coresta units. 
     
     
         19 . A smoking article according to  claim 16 , wherein the one or more filter wrappers have a basis weight between about 65 grams per square metre and about 85 grams per square metre. 
     
     
         20 . A smoking article according to  claim 16 , wherein the diameter (D SA ) to thickness (t) ratio is greater than about 50. 
     
     
         21 . A smoking article according to  claim 16 , wherein the filter wrapper or wrappers have a thickness (t 1 ) substantially perpendicular to the longitudinal direction of the smoking article, wherein t 1 /t is greater than about 0.65. 
     
     
         22 . A smoking article according to  claim 16 , wherein the tipping material and the one or more filter wrappers have a combined thickness (t) of between about 100 μm and about 160 μm. 
     
     
         23 . A smoking article according to  claim 16 , wherein the one or more filter wrappers have a combined thickness (t 1 ) of between about 90 μm and about 120 μm. 
     
     
         24 . A smoking article according to  claim 16 , wherein the thickness of the tipping material is between about 30 microns and about 70 microns. 
     
     
         25 . A filter for a smoking article, the filter comprising:
 a plug of filtration material;   one or more filter wrappers surrounding the plug of filtration material;   wherein the one or more filter wrappers have a combined wrapper thickness (t 1 ) perpendicular to the longitudinal direction of the filter;   wherein the filter has a diameter (D F ) perpendicular to the longitudinal direction of the filter;   wherein the filter diameter (D F ) to wrapper thickness (t 1 ) ratio is less than about 135;   wherein the filter comprises perforations extending through the one or more filter wrappers,   and wherein the filter has a critical load from 30 Newtons to 80 Newtons   
     
     
         26 . A filter according to  claim 25 , wherein the one or more filter wrappers have a porosity of less than about 1000 Coresta units. 
     
     
         27 . A filter according to  claim 25 , wherein the one or more filter wrappers have a porosity of less than about 500 Coresta units. 
     
     
         28 . A filter according to  claim 25 , wherein the one or more filter wrappers have a basis weight between about 65 grams per square metre and about 85 grams per square metre. 
     
     
         29 . A filter according to  claim 25 , wherein the filter diameter (D F ) to wrapper thickness (t 1 ) ratio is greater than about 70. 
     
     
         30 . A filter according to  claim 25 , wherein the combined thickness of the one or more filter wrappers is between 90 microns and 120 microns. 
     
     
         31 . A method of reducing buckling during extinguishing of the smoking article, the method comprising providing a plug of filtration material, the plug being surrounded by one or more filter wrappers; and tipping material attaching the tobacco rod and the filter, the tipping material including a ventilation zone; wherein the tipping material and the filter wrapper or wrappers have a combined thickness (t) perpendicular to the longitudinal direction of the smoking article; wherein the smoking article, at a location about the plug of filtration material, has a diameter (DSA) perpendicular to the longitudinal direction of the smoking article; wherein the diameter (DSA) to thickness (t) ratio is less than 80; wherein the ventilation zone comprises perforations through the tipping material; wherein the perforations extend through the one or more filter wrappers; and wherein the filter has a critical load from 30 Newtons to 80 Newtons.