Production of tobacco-smoke filters

A method for producing rod-shaped tobacco-smoke filter components each having at least one annular tobacco-smoke barrier, wherein annular grooves open at their periphery are formed in rod-shaped bodies of smoke-filtration material, the rod-shaped bodies being rotated about their longitudinal axes while being conveyed in a direction transverse to their axes along an arcuate path past at least one deposition member for a settable liquid barrier material supplied to that member, the member being located to extend into the grooves during the conveyance of the bodies along the path, the material being transferred from suface to surface of the member and grooves during the relative movement between them and the barriers being produced by the material when set.

Apparatus for producing rod-shaped tobacco-smoke filter components each having at least one annular tobacco-smoke barrier, comprising means for conveying rod-shaped bodies of smoke-filtration material, each having at least one annular groove open at the periphery, in a direction transverse to their longitudinal axes along an arcuate path, means for rotating the bodies about their axes while being so conveyed, and at least one deposition member for a settable liquid barrier material supplied to that member, the member being located to extend into the grooves during the conveyance of the bodies along the path, whereby said material is transferred from surface to surface of the member and grooves during the relative movement between them, said barriers being produced by the material when set.

Apparatus for producing rod-shaped tobacco-smoke filter components each having one or more annular tobacco-smoke barriers, comprising means for forming annular grooves open at their peripheries in rod-shaped bodies of smoke-filtration material, means for conveying the grooved bodies in a direction transverse to their longitudinal axes along an arcuate path, means for depositing settable smoke-barrier material in the grooves during the conveyance in the path, and means for rotating the bodies about their said axes during the deposition of the barrier material, whereby filter components with annular smoke barriers are produced, the means for depositing the barrier material in the annular groove comprising at least one rotary disc member which extends into a said groove of each grooved body in the course of its conveyance along the arcuate path and means for supplying the barrier material to the rotary member.