An adjustable roller for a crimper for sheet material is provided, including: a substantially cylindrical exterior portion having first and second ends with a longitudinal axis of rotation extending between the first and the second ends; and a first bushing mounted inside the first end and a second bushing mounted inside the second end, the first bushing and the second bushing each having a respective cylindrical bore with an axis that is parallel to the longitudinal axis of rotation, and at least one of the first bushing and the second bushing being adjustably mounted inside a respective end of the roller such the axis of the at least one of the first bushing and the second bushing is displaceable relative to the longitudinal axis of rotation. A roller device for a crimper, and a method of adjusting an orientation of a longitudinal axis of a roller, are also provided.

A method for producing a plug for forming part of an aerosol-generating article is provided, the method including: feeding a sheet along a longitudinal direction to a set of crimping rollers; forming a crimped sheet including corrugated regions and interruption bands, the sheet including corrugations extending in a longitudinal direction, in the interruption bands, the sheet having no corrugations or corrugations with smaller corrugation amplitude, the bands and the regions being alternatingly arranged, each band including leading and trailing portions arranged on opposite sides of the sheet, a width of the sheet being an extension of the sheet orthogonal to the longitudinal direction, and the leading portion being arranged at a different location than the trailing portion; gathering the sheet; and forming a plug from the gathered sheet.

A method for embossing a sheet of substrate, wherein the embossing is realized by providing means of at least a first embossing roller and a second embossing roller configured to emboss first structures and second structures, thereby embossing the sheet of substrate when this passes in a nip formed by the first and second embossing rollers, whereby the embossed sheet of substrate is configured to be used in a manufacturing of cigarette filters, and is further configured to be entirely biodegradable. The method comprises providing a sheet of substrate. The method further comprises any one of the embossing steps in a list comprising: embossing the sheet of substrate with first structures to form crimping lines; embossing the sheet of substrate with second structures to form chimney structures; embossing the sheet of substrate with a combination of first and second structures to form crimping lines and chimney structures respectively. The crimping lines have a first width at a surface level of the sheet of substrate, and a first height or depth measured from the surface level in a first range of 0.1 mm to 0.5 mm, thereby configured to be deformable when used in the manufacturing process of cigarette filters. the chimney structures comprise segments that have a second width at the surface level of the sheet of substrate, in a second range of 0.5 mm to 5.0 mm, and a second height or depth measured from the surface level in a third range of 0.1 mm to 1.5 mm, thereby configured to remain open when used in the manufacturing process of cigarette filters and influence a pressure drop of air in such cigarette filters. Further the sheet of substrate comprises fibers with a cut length in a fourth range of 0.5 mm to 6.0 mm, and with a diameter in a fifth range of 10 m to 500 m, the fibers being entirely biodegradable and randomly distributed to deliver an air permeability. The sheet of substrate's air permeability being configured with filtration capabilities of substances present in a cigarette smoke.

Provided is a preparation method for a polylactic acid fiber filter rod with better temperature resistance, which relates to the technical field of cigarette preparation. The method includes the following steps: separately selecting an up-to-standard polylactic acid raw material having the highest content and having the lowest content of the levo-isomer to prepare a core component and a sheath component; forming sheath-core polylactic acid fiber tows; and carrying out forming on a plurality of sheath-core polylactic acid fiber tows to prepare a polylactic acid filter rod. By means of controlling the proportions and preparation of polylactic acid raw materials, so as to improve the uniformity of an inner-layer structure thereof, and the filter performance of the polylactic acid tows is improved.

An aerosol-generating article is provided, including: an aerosol-generating substrate; and a downstream element provided downstream of the aerosol-generating substrate and in axial alignment with the aerosol-generating substrate, the downstream element including a plug element including a cellulosic filtration material including: a paper material, and an additive coating applied to the paper material, the additive coating including: at least one exogenous polysaccharide, and at least one additive for reducing phenols, the at least one exogenous polysaccharide including an acetylated starch or an oxidised and acetylated starch, and the plug element including at least 5 percent by weight of the acetylated starch or oxidised and acetylated starch based on a dry weight of the paper material, on a dry weight basis.