EVALUATING POROSITY DISTRIBUTION WITHIN A POROUS ROD

摘要

In a method for evaluating porosity distribution within a porous article such as a crimped filter a tobacco plug or a cigarette a digital image is obtained of a transverse area of the article and a pore area fraction is determined for each of a plurality of identically dimensioned sub areas of the transverse area of the article. This provides a plurality of pore area fractions. The plurality of pore area fractions allow the evaluation of a local porosity distribution within the transverse area of the porous article. Each sub area within which a pore area fraction is calculated overlaps with at least one adjacent sub area by between 10% and 95%. The method for quantitatively evaluating porosity distribution may be used to control a process for manufacturing the porous article.