Abstract 1. The method of treating an elongated web of fibrous material to render the same particularly adapted to be gathered transversely and enclosed in a wrapper to make a filter cord subdividable into filler rods and filter plugs for cigarettes, the steps comprising: advancing an essentially in elastic web of the material through the bight between a pair of meshing rotating rolls provided with narrow longitudinal grooves parallel to the axes of the rolls alternating with narrow longitudinal ribs parallel to the axes of the rolls which engage the web and prevent appreciable longitudinal contraction thereof so that the web is stretched longitudinally to loosen and expose fibers in a plurality of closely-spaced successive narrow areas disposed transversely on the web without substantial impairment of the longitudinal continuity of the web; and advancing the longitudinally stretched web through the bight between a pair of non-contacting meshing rotating rolls provided with narrow circumferential grooves alternating with narrow circumferential ribs which engage the web and prevent appreciable lateral contraction thereof to groove the web in a direction parallel to its travel and stretched transversely of the grooves to loosen and exposure fibers in a plurality of closely-spaced narrow longitudinal areas without substantial impairment of the transverse continuity of the web.
The method of treating an elongated web of fibrous material to render the same particularly adapted to be gathered transversely and enclosed in a wrapper to make a filter cord subdividable into filler rods and filter plugs for cigarettes, the steps comprising: advancing an essentially in elastic web of the material through the bight between a pair of meshing rotating rolls provided with narrow longitudinal grooves parallel to the axes of the rolls alternating with narrow longitudinal ribs parallel to the axes of the rolls which engage the web and prevent appreciable longitudinal contraction thereof so that the web is stretched longitudinally to loosen and expose fibers in a plurality of closely-spaced successive narrow areas disposed transversely on the web without substantial impairment of the longitudinal continuity of the web; and advancing the longitudinally stretched web through the bight between a pair of non-contacting meshing rotating rolls provided with narrow circumferential grooves alternating with narrow circumferential ribs which engage the web and prevent appreciable lateral contraction thereof to groove the web in a direction parallel to its travel and stretched transversely of the grooves to loosen and exposure fibers in a plurality of closely-spaced narrow longitudinal areas without substantial impairment of the transverse continuity of the web.
Claim 2
Independent Claim
207 words
The method of treating an elongated web of fibrous material to render the same particularly adapted to be gathered transversely and enclosed in a wrapper to make a filter cord subdividable into filler rods and filter plugs for cigarettes, the steps comprising: advancing an essentially in elastic web of the material through the bight between a pair of meshing rotating rolls provided with narrow longitudinal grooves parallel to the axes of the rolls alternating with narrow longitudinal ribs parallel to the axes of the rolls which engage the web and prevent appreciable longitudinal contraction thereof so that the web is stretched longitudinally to loosen and expose fibers in a plurality of closely-spaced successive narrow areas disposed transversely on the web without substantial impairment of the longitudinal continuity of the web; and advancing the longitudinally stretched web through the bight between a pair of non-contacting meshing rotating rolls provided with narrow circumferential grooves alternating with narrow circumferential ribs which engage the web and prevent appreciable lateral contraction thereof to groove the web in a direction parallel to its travel and stretched transversely of the grooves to loosen and exposure fibers in a plurality of closely-spaced narrow longitudinal areas without substantial impairment of the transverse continuity of the web.