Patent ID: 6193810
Filing Date: 2001-02-27
Classification: B08B

Abstract:
A method of manufacturing a multiple-ply tissue having an unexpectedly low loose dust and lint count by removing dust and lint from both outwardly facing surfaces of a multiple-ply tissue web while the web is traveling with its accompanying boundary layers of air in a predetermined plane and direction in a tissue rewinding machine, comprising the steps of:a) directing scrubber gas in a transversely elongated jet from a slit defining a Coanda nozzle so that the jet forms a thin, non-turbulent layer of rapidly moving gas which moves in a direction opposite to web travel and scrubs the boundary layer of air and entrained dust and lint, as well as dust and lint embedded in one surface of the web, away from the one surface of said web;b) directing said scrubber gas with the air and lint and dust which it has removed from said one surface of said web to follow a Coanda nozzle airfoil surface adjacent said slit until it reaches and is drawn into an exhaust plenum;c) simultaneously directing another transversely elongated jet of scrubber gas from another slit defining a second Coanda nozzle so that it forms a thin, non-turbulent layer of rapidly moving gas which moves in a direction opposite to web travel and scrubs the boundary layer of air and entrained dust and lint as well as dust and lint embedded in the other surface of said web, away from the other surface of said web; andd) directing said scrubber gas with the air and lint and dust which it has removed from said other surface of said web to follow a second Coanda nozzle airfoil surface adjacent said another slit until it reaches and is drawn into an exhaust plenum.