A mouthpiece for a smoking device is provided. The mouthpiece comprises a porous substrate. The porous surface comprises a wall having an outer surface having an outer cross-sectional shape and an inner surface having an inner cross-sectional shape. The inner surface defines a hollow interior space. A wall thickness is defined by the outer and inner surfaces. The porous substrate has a specific hardness of at least about 1.5 hardness % per weight (g) per length (mm) of the porous substrate. The porous substrate has a porosity of about 50% to about 70%. The inner and outer surfaces provide a wall thickness of about 20% to 60% of an area defined by the outer cross-sectional shape.

The present invention relates to a filter component comprising a plug of filter material comprising a body of a first filtering material and at least one element of a second filtering material, wherein the at least one element of the second filtering material is inserted in the body of a first filtering material, and wherein a volume ratio between a volume of the at least one element of a second filtering material and a volume of the plug is comprised between about 0.3 and about 0.8.

An aerosol generating article includes: an aerosol generating unit including an aerosol generating material; a tobacco filling unit arranged at a downstream end of the aerosol generating unit; a cooling unit arranged at a downstream end of the tobacco filling unit and configured to cool an aerosol; and a thread filter arranged at a downstream end of the cooling unit and including a filter portion and a thread portion which have different flow rates of the aerosol.

The present disclosure relates to a flavor delivery device and a cartridge that includes such flavor delivery device. The flavor delivery device includes a flavor substrate that can be formed of a porous material, and further including flavor material included within the flavor substrate. The flavor substrate is surrounded by an outer sleeve which is impermeable to the flavor material. The flavor delivery device may be positioned within a cartridge of an aerosol delivery device where the flavor delivery device is located downstream from a reservoir containing an aerosol precursor composition relative to the mouthend of the cartridge.

Disclosed herein is a degradable cigarette filter comprising a cellulose ester and including a catalyst comprising a basic material, an enzymatic material, or combinations thereof. The catalyst, when exposed to water, may deacetylate the bloomed cellulose acetate tow by at least 10% in 20 days or less. The filters described herein therefore degrade more rapidly than other known cellulose acetate tow filters.

The present disclosure relates to a flavor delivery device and a cartridge that includes such flavor delivery device. The flavor delivery device includes a flavor substrate that can be formed of a porous material, and further including flavor material included within the flavor substrate. The flavor substrate is surrounded by an outer sleeve which is impermeable to the flavor material. The flavor delivery device may be positioned within a cartridge of an aerosol delivery device where the flavor delivery device is located downstream from a reservoir containing an aerosol precursor composition relative to the mouthend of the cartridge.

A filter part (1) for use in an aerosol generating article and a method of manufacturing the filter part (1). The filter part (1) includes an aerosol permeable core (11) surrounded by a sleeve (12). The sleeve (12) is formed of linear, axially oriented fibres and the core (11) is formed of expanded, randomly oriented fibres. The method includes forming two or more strips (2a, 2b) into segments surrounding a conveying path, bringing the segments together into a sleeve former (7) to form the sleeve (12) and introducing loose fibres (52) between the segments upstream of the sleeve former (7) such that they are drawn therein in a random orientation and compressed between the segments as they are brought together to form a filter rod (8) with an aerosol permeable core (11) within the sleeve (12). The filter rod (8) is then cut to form the filter part (1).

A mouthpiece for a smoking device is provided. The mouthpiece comprises a porous substrate. The porous surface comprises a wall having an outer surface having an outer cross-sectional shape and an inner surface having an inner cross-sectional shape. The inner surface defines a hollow interior space. A wall thickness is defined by the outer and inner surfaces. The porous substrate has a specific hardness of at least about 1.5 hardness % per weight (g) per length (mm) of the porous substrate. The porous substrate has a porosity of about 50% to about 70%. The inner and outer surfaces provide a wall thickness of about 20% to 60% of an area defined by the outer cross-sectional shape.

The present invention relates to a filter component comprising a plug of filter material comprising a body of a first filtering material and at least one element of a second filtering material, wherein the at least one element of the second filtering material is inserted in the body of a first filtering material, and wherein a volume ratio between a volume of the at least one element of a second filtering material and a volume of the plug is comprised between about 0.3 and about 0.8.

A biodegradable bi-component fiber may include a polyhydroxyalkanoate and/or polylactic acid with cellulose acetate and/or plasticized cellulose acetate for use in a filter material configured for use in a filter of a smoking article. The bi-component fiber may have a sheath-core construction where one component of the bi-component forms the core, and the other component forms the sheath of each fiber. A filter made in accordance with this design may also include non-biodegradable material.