Method and apparatus for manufacturing a crimped web

A method of manufacturing a crimped web for an aerosol-generating article, the method comprising:

• feeding a substantially continuous web to a set of crimping rollers, the set of crimping rollers comprising a first roller and a second roller, each of which is corrugated across at least a portion of a width thereof, the first and second rollers being arranged such that corrugations of the first roller substantially interleave with corrugations of the second roller;
• and
• crimping the substantially continuous web to form the crimped web by feeding the substantially continuous web between the first and second rollers in a longitudinal direction of the web such that the corrugations of the first and second rollers apply a plurality of longitudinally extending and substantially parallel crimp corrugations to the substantially continuous web,
• wherein pitch values of the corrugations of one or both of the first and second rollers vary across the width of the rollers such that pitch values of the crimp corrugations vary across a width of the crimped web.