Patent ID: 6482468
Filing Date: 2002-11-19
Classification: B41F,B41M

Abstract:
A method for powdering printed sheets of paper comprising the steps of:removing a powder from a supply container and mixing the powder with air in a mixing device; distributing the powder from the mixing device by an air stream; applying the powder onto the sheet by a nozzle unit that is adaptable to a width of the sheet by changing one of a number of outlet openings feeding powder to the nozzle unit and an outlet cross section of the nozzle unit based on a measurement of the paper size; generating the air stream with an air pressure generator; modifying the airflow from the air pressure generator based on one of the number of active outlet openings, the outlet cross section area, and a transport speed of the paper sheets; and reducing air flow when one of the number of outlet openings and the outlet cross section area of the nozzle is reduced based on a change in the width of the paper sheet.