Importance

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Abstract

An apparatus for forming an aeration groove in a filter which is composed of a body of entrainment-type fiberous filter material and a layer of plug wrap paper circumferentially about the body. The apparatus is comprised of a rotatable filter drum for conveying a series of the filter plugs in sequential order past a grooving station and a forming means within the drum at the grooving station for forming at least one peripheral groove in each filter plug conveyed through the station. The forming means effects a groove which extends through the plug wrap paper in order to communicate the exterior of the filter plug with the body of filter material. In addition, a resilient guide is located at the grooving station opposite to the forming means in order to roll the filter plugs through the grooving station. In this way, rolling of the filter plugs in enhance and the formation of a complete annular groove is ensured. Further, a suction means is provided which communicates with the interior of the drum for drawing off material removed from the filter plugs.

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First Claim