Title: Apparatus for making webs of filtering material for tobacco product filters, particularly cigarette filters

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Abstract: An elongated web of paper is treated to render it especially suitable for being gathered transversely and wrapped to make cigarette filters. The treatment includes passing the web through the bight between a pair of rotating rolls provided with intermeshing ribs that do not contact one another and which are arranged generally in planes parallel to their axis of rotation so that the paper is stretched longitudinally in successive transverse areas whereby the paper fibers are loosened and exposed in such areas without complete destruction of the longitudinal continuity of the web. Thereafter the paper is passed through the bight between another pair of rolls provided with narrowly-spaced circumferential intermeshing ribs which do not contact one another and are arranged generally in planes normal to the axis of the rolls so that the paper is grooved parallel to the travel of the web and stretched transversely of these grooves to loosen and expose the fibers even more without destroying the transverse continuity of the web.


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