Abstract: A method and a device for supplying filter material to a filter rod forming machine, according to which a flat band of filter material, obtained working a single “tow”, is longitudinally cut in at least two strips, each of which is fed to a respective pneumatic device adapted to transform the respective strip in a respective cord. The cords are then fed to an inlet of the forming machine at positions evenly distributed about a central axial portion for forming a peripheral axial portion.

Abstract: A method and machine for producing paperless filter rods for smoking articles, according to which a tow band of hardening-material-impregnated filtering material is fed along a forming beam having a first portion along which the tow band is injected with steam to cause the hardening material to react, and a second portion along which the tow band is dried with air, coming out from the forming beam, a continuous paperless rigid rod filter, which is fed to a cutting device; the steam blowing being performed at a plurality of stations arranged in series along the first portion; and the steam being fed, at each station, into an accumulation chamber surrounding the forming channel and communicating with the forming channel through an annular nozzle arranged on a transverse plane to the forming channel and having a constant width, measured along an axis of the forming channel, of 0.3 to 0.9 mm.

Abstract: A method and a device for supplying filter material to a filter rod forming machine having a peripheral axial portion and a central axial portion, according to which a flat band of filter material, obtained working a single “tow”, is longitudinally cut in at least two strips, each of which is fed to a respective pneumatic device adapted to transform the respective strip in a respective cord. The cords are then fed to an inlet of the forming machine at positions evenly distributed about the central axial portion for forming the peripheral axial portion.