Method and machine for producing paperless filter rods for smoking articles
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United States of America Patent
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Jul 19, 2016
Grant Date -
Sep 5, 2013
app pub date -
Mar 4, 2013
filing date -
Mar 5, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and machine for producing paperless filter rods for smoking articles, according to which a tow band of hardening-material-impregnated filtering material is fed along a forming beam having a first portion along which the tow band is injected with steam to cause the hardening material to react, and a second portion along which the tow band is dried with air, coming out from the forming beam, a continuous paperless rigid rod filter, which is fed to a cutting device; the steam blowing being performed at a plurality of stations arranged in series along the first portion; and the steam being fed, at each station, into an accumulation chamber surrounding the forming channel and communicating with the forming channel through an annular nozzle arranged on a transverse plane to the forming channel and having a constant width, measured along an axis of the forming channel, of 0.3 to 0.9 mm.
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