A tobacco-smoke filter comprises a filter tube extending eccentrically within an outer tubular wrapper, the spaces within the tube and between it and the wrapper being closed at opposite ends so that smoke entering the filter at one end is constrained to flow radially through the wall of the tube from one of the said spaces into the other. The filter tube may be closed at one end by a disc with channels at its periphery communicating with the space between the filter tube and the wrapper, while the space between the filter tube and the wrapper is closed at the other end by a disc having a central hole communicating with the space within the tube.
Filter mouthpieces with one or more thin filter disks consisting of a first filter material and one or more filter plugs consisting of a second filter material are produced by inserting filter disks between spaced-apart filter plugs which form a single file and travel with a web of wrapping material. The web is thereupon draped around the alternating filter disks and filter plugs to form therewith a continuous filter rod which is severed to yield discrete filter mouthpieces.
A cigarette filter rod element including an axially extending barrier tube of micro-fine fibres with a diameter of between 0.5 and 10 microns and located so that at least part of the gas flow passes through the wall of said barrier tube.
The sensory effect of cigarette smoke is improved by using a disc (24) to shape the flow of smoke (32) leaving smoking article (10) into a divergent pattern, thus increasing the perceived flavor of the cigarette. The effect is most useful with cigarettes having relatively low delivery of particulate matter.
A cigarette smoke filter is provided for use in a smoker's accessory for filtering cigarette smoke, the filter comprises: a tubular filter normally of micro-fibres for removing particulate material from cigarette smoke and optionally an outer filter layer of activated carbon material or the like for adsorbing gaseous components from the cigarette smoke. The efficiencies of the tubular filters is such to remove substantially all of the particulate and gaseous components from the cigarette smoke so that the filtered smoke stream can be discharged into the surroundings free of any cigarette smoke smell.
A smoker's accessory for filtering cigarette smoke includes an exhaust fan, a smoke filter cartridge having a cigarette tube with an open end through which the burning end of the cigarette is placed, a porous tubular filter element at an end of the cigarette tube, a fresh air inlet and a temperature sensor adjacent the cigarette tube. The temperature sensor activates a signal upon detection of a burning cigarette in the cigarette tube.
