GB1100116A - Method of manufacturing tobacco smoke filters - Google Patents

Abstract

1,100,116. Tobacco smoke filters. CIGARETTE COMPONENTS Ltd. 29 Dec., 1964 [30 Dec., 1963; 7 Feb., 1964], Nos. 51211/63 and 52127/64. Heading A2C. Multiple length filter rods are injected at axially spaced intervals with an additional material to form, when cut, first and second sections unitary with each other, the first section carrying throughout its cross-sectional area the additional material. Multiple lengths, e.g. sextuple length, filter rods, of e.g. cellulose acetate, are fed from a hopper 1 to channels 12 of a drum 3. The drum 3 is intermittently driven from a motor 11 via a wheel 9 having a roller 8 which engages a Geneva disc 7 having a gear 6 which meshes with a gear 5 on the drum 3. The motor 11 also drives a shaft 21 which has two cam track discs 23 and 24. Disc 23 serves to reciprocate a frame 17, slidably mounted on guide rails 18 and supporting pistoncylinder units 13, 14, 15 and 16, and disc 24 serves to reciprocate a cross-head 20, also mounted on the guide rails 18 and connected by rods 19 to the pistons of the units 13-16. A flexible conduit 27 feeds each piston-cylinder unit 13-16 with additional material from a reservoir 28. The additional material may be a liquid suspension of activated carbon or menthol. A guide 34 retains the filter rod lengths in the channels 12 prior to discharge on to a conveyer 36. Apertures 35 are provided in the guide 34 for passage of the needles 30, 31, 32 and 33 of the units 13-16. During the time when the drum 3 is stationary the cam discs 23 and 24 cause the piston cylinder units 13-16 to advance towards the filter rod opposite the apertures 35 and the needles 30-33 pierce the rod. At the same time the pistons 19 are moved forwardly so that there is no relative movement between the pistons and the cylinders. Relative movement to inject the additional material occurs during withdrawal of the piston and cylinders from the filter rod, the shape of the cams 23 and 24 being such that more material is injected as the needles are withdrawn through the centre of the cross-section of the rod. Various arrangements of orifices in the needles 30-33 are described (Figs. 4-9, not shown) so that the desired distribution of material is effected. The length of filter rod and number of piston-cylinder units may be varied.