Filter paper for cigarette filters and filter comprising it

Abstract

The object of the invention is a filter paper characterized in that it includes between 70% and 100% by weight of cellulose fibers, wherein between 50% and 75% by weight of the fibers are long fibers, understanding by this fibers that have an average length greater than 2 mm, and between 25% and 50% by weight of the fibers are short fibers, understanding by this fibers that have an average length of less than 2 mm; between 0.1% and 5.0% by weight of sodium carboxymethyl cellulose; and wherein the weight of the filter paper per unit area is between 25 and 55 g/m2, measured according to UNE-EN ISO 536:2013 standard; the density thereof varies between 0.100 and 0.500 g/cm3, measured according to UNE-EN ISO 534:2012 standard in a single sheet; and the porosity of the filter paper is between 1500 and 8500 ml/min·cm2·kPa, measured according to UNE-EN ISO 2965:2019 standard. The paper filter including said filter paper is also an object of the invention.

Dependencies are inferred from the claim text.