Filter Component for an Aerosol-Generating Article

Abstract

A filter component for an aerosol-generating article includes a core including filtration material wrapped around by a first wrapper, wherein the first wrapper is air impermeable and includes a plurality of corrugations of sinusoidal waveform extending longitudinally along a sinuous air flow path from and/or to a longitudinal end of the filter component at least.

1 . A filter for an aerosol-generating article comprising:
 a first filter component having a core comprising filtration material wrapped around by a first wrapper, wherein the first wrapper is air impermeable and comprises a plurality of corrugations of sinusoidal waveform extending longitudinally along a sinuous air flow path from and/or to a longitudinal end of the first filter component at least; and   a second filter component coaxially arranged longitudinally at an end of the first filter component, and maintained therewith with an outer wrapper wrapped around both the first and second filter components.   
     
     
         2 . The filter of  claim 1 , wherein the first filter component further comprises a second wrapper configured to wrap around the first wrapper such that the plurality of corrugations define channels between the first wrapper and the second wrapper. 
     
     
         3 . The filter of  claim 2 , wherein the second wrapper comprises perforations in fluid communication with the channels to create an air flow through the channels by drawing on the filter component. 
     
     
         4 . The filter of  claim 1 , wherein a wave length of the sinusoidal waveform is in a range of 1 mm to 3 mm. 
     
     
         5 . The filter of  claim 1 , wherein an amplitude of the sinusoidal waveform is in a range of 0.5 mm to 2 mm. 
     
     
         6 . The filter of  claim 1 , wherein the first wrapper comprises plastic material. 
     
     
         7 . The filter of  claim 1 , wherein the first wrapper has Modulus of Elasticity in a range of 1.09 to 2.28 GPa. 
     
     
         8 . The filter of  claim 1 , wherein the first wrapper has Elongation at Break in a range of 2.5 to 24%. 
     
     
         9 . The filter of  claim 1 , wherein the second filter component is at least partially hollow along a longitudinal axis of the second filter component. 
     
     
         10 . An aerosol-generating article comprising a charge of aerosol-generating substrate and the filter according to  claim 1  attached at an end thereof such that the first filter component is abutting against said charge of the aerosol-generating substrate. 
     
     
         11 . The aerosol-generating article of  claim 10 , further comprising a paper tube disposed between the first filter component and the second filter component. 
     
     
         12 . The aerosol-generating article of  claim 10 , further comprising a paper tube disposed between the aerosol-generating substrate and the second filter component. 
     
     
         13 . A method of forming a filter for an aerosol-generating article, the method comprising:
 forming a first filter component with a plurality of corrugations of sinusoidal waveform extending longitudinally at least partly along a sinuous air flow path on an air impermeable first wrapper from an end thereof;   providing a core of filtration material in the first filter component;   wrapping the first wrapper around the core;   forming a second filter component coaxially arranged longitudinally at an end of the first filter component; and   wrapping an outer wrapper around both the first and second filter components to maintain the first and second filter components together.   
     
     
         14 . The method of  claim 13 , wherein the plurality of corrugations are formed by pressing and heating the first wrapper between two embossing rollers. 
     
     
         15 . The method of  claim 13 , wherein a second wrapper is wrapped around the first wrapper such that the plurality of corrugations define air channels between the first wrapper and the second wrapper. 
     
     
         16 . The filter of  claim 1 , wherein the first wrapper comprises polylactic acid.