A component and related methods for forming a component for an article for use in or as a combustible aerosol provision system can include a body of material extending in a longitudinal direction, where the body of material includes crimped sheet material formed having a crimp pattern including a series of substantially parallel ridges and grooves. The average spacing between adjacent ridges can be greater than about 0.3 mm and the average density of the body of material can be between about 0.1 and about 0.25 mg/mm.sup.3. Additionally, the crimp amplitude can be less than about 0.7 mm or between about 0.7 mm and about 1.2 mm. There is also provided an article for use in or as a combustible aerosol provision system, the article including an aerosol generating material and a downstream portion downstream of the aerosol generating material, the downstream portion having the component.

Disclosed are a lyocell material for a cigarette filter and a method of preparing the same, wherein a crimped tow is manufactured using a lyocell multifilament including low-strength lyocell monofilaments, and thus the ultimately prepared lyocell material for a cigarette filter can exhibit low strength, thereby increasing processing efficiency during the manufacture of the cigarette filter.

Disclosed are a lyocell material for a cigarette filter and a method of preparing the same, wherein a crimped tow is manufactured using a lyocell multifilament including low-strength lyocell monofilaments, and thus the ultimately prepared lyocell material for a cigarette filter can exhibit low strength, thereby increasing processing efficiency during the manufacture of the cigarette filter.

The invention relates to an apparatus for crimping a sheet of material, the apparatus comprising a first and second facing crimping roller defining a first and second rotation axis, respectively, the first roller including: a first plurality of circumferential ridges, each ridge defining a ridge amplitude; wherein each of said first plurality of ridges is interrupted along its circumferential extension forming an interruption gap where for a given interruption angle an amplitude of the ridge differs from the ridge amplitude in the remaining circumferential extension of the ridge; wherein said plurality of interruption gaps forms an interruption band defining a direction of extension, said direction of extension being angled with respect to a direction defined by the first rotation axis of an angle comprised between about 2? to about 25?. The invention also relates to a method for crimping a sheet of material as well as a crimped sheet of material and a rod made of a crimped sheet.

A method for expanding cigarette filter fiber cell structure, comprises providing a cigarette filter fiber, adding a liquid to the cigarette filter fiber to form a cigarette filter fiber and liquid solution; and expanding total fiber volume and cell cavities in the cigarette filter fiber by performing an expansion process on the filter fiber and liquid solution.

A filter for a smoking article includes a filter component formed from a solution of cellulose acetate and a degradable polymer in aceton, the degradable polymer being soluble in acetone and degrading in the presence of water. In a first aspect of the invention, the filter component is a filter segment (16) formed of a plurality of fibers formed from the degradable solution. In a second aspect of the invention, the filter component is a wrapper (39) circumscribing at least a segment of the filter.

There is provided a method of making rods having predetermined values of cross-sectional porosity, and a cross-sectional porosity distribution value for use as an aerosol-forming substrate in a heated aerosol-generating article, including providing a continuous sheet of aerosol-forming material having a specified width and a specified thickness; gathering the sheet transversely relative to a longitudinal axis thereof; circumscribing the gathered sheet with a wrapper to form a continuous rod; severing the rod into a plurality of discrete rods; determining values of cross-sectional porosity and cross-sectional porosity distribution for at least one of the discrete rods; and controlling one or more manufacturing parameters to ensure that the cross-sectional porosity and cross-sectional porosity distribution values of subsequent rods are within the predetermined values.

Disclosed are cellulose acetate cellulose acetate tow and processes for making cellulose acetate tow having at least 15 denier per filament, e.g., at least 20 denier per filament, or at least 25 denier per filament. The cellulose acetate tows may have total denier of more than 20,500.

A filter rod comprises a core of cellulose acetate fibers surrounded by a lofty porous network of charge retaining polymer fibers. The charge retaining fibers can be charged to attract and hold particles from such sources as particulate matter from sorbents (preventing break-through), and smoke constituents while having a suitable pressure drop.

There is provided a method of making rods having predetermined values of cross-sectional porosity, and a cross-sectional porosity distribution value for use as an aerosol-forming substrate in a heated aerosol-generating article, including providing a continuous sheet of aerosol-forming material having a specified width and a specified thickness; gathering the sheet transversely relative to a longitudinal axis thereof; circumscribing the gathered sheet with a wrapper to form a continuous rod; severing the rod into a plurality of discrete rods; determining values of cross-sectional porosity and cross-sectional porosity distribution for at least one of the discrete rods; and controlling one or more manufacturing parameters to ensure that the cross-sectional porosity and cross-sectional porosity distribution values of subsequent rods are within the predetermined values.