A device for the electrostatic application of particles entrained in a stream of gas to a non-conductive, flat substrate, typically a web or sheets of paper. The particles are electrically neutral in the stream. A charging electrode is located below the substrate in the area where the gas stream impinges...http://www.google.es/patents/US4324198?utm_source=gb-gplus-sharePatente US4324198 - Device for the electrostatic application of material particles entrained in a stream of gas to an advancing, flat substrate
Device for the electrostatic application of material particles entrained in ...
