Method and apparatus for forming an air dilution filter
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United States of America Patent
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-
Jan 25, 1983
Issued Date -
N/A
app pub date -
Mar 14, 1980
filing date -
Aug 19, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The air dilution filter of the cigarette is provided with an annular zone in the plug wrap paper which enables air to pass directly into the fibrous body of the filter material after passing through apertures in the tipping paper. The annular zone can be comprised of a groove which is fabricated by a pair of rotating knives and a rotatable spacer with radial cutting edges which rout out material from each filter plug during conveyance of the plug on an alignment drum of a cigarette making machine. Alternatively, a plurality of closely spaced rotating knives which cut through the plug wrap paper only may be used to form a series of closely spaced annular grooves or slits in the filter periphery.
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