Method for producing cigarette filters and the filters obtained

Abstract From the Canadian patent

The method produces cigarette or cigar filters from a fibrous sheet comprising a mixture of artificial fibers such as fibers of cellulose acetate and fibers of natural cellulose. Artificial fibers capable of being plasticized are employed a specific plasticizer of, the material constituting said fibers is applied on this layer. This plasticizer creates, after the shaping of the sheet into a cylindrical roll, an interfiber connection network in the artificial fibrous texture of the sheet on which there is superposed a second interfiber connection network between the contacting zones of the sheet shaped into a filtering roll.