Rothmans of Pall Mall Canada Limited

Daniel Di Ianni

Warren A Brackmann

A tobacco smoke filter comprising a single filter element consisting wholly of a plurality of randomly-oriented non-crimped smooth-surfaced solid fibers of thermoplastic polymeric non-absorbent material, each of the fibers having a uniform diameter less than about 5 microns. The filter element has a generally circular cross-section taken across the intended flow path of the tobacco smoke and a diameter substantially equal to the diameter of a tobacco smoke flow path. The weight of polymeric material exceeds about 6 mg and the filter element has a pressure drop thereacross of from 1 to 10 inches of water at a flow rate of 17.5 ml/sec.

Filter for tobacco smoke

Hardness variations in a tobacco filler rod are detected and corrected in a single operation in conjunction with trimming of the tobacco to provide a trimmed filler rod of uniform height and uniform hardness. The single operation detection and correction is achieved by using force-applying member to compress the tobacco to a greater or lesser extent immediately prior to trimming, the degree of compression depending on the compressive force applied and the resistance of the tobacco to compression.

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Toronto, Canada

Daniel Di Ianni