A method for dispensing particles onto a surface. The steps of the process include holding the particles in a hopper having a dispensing opening covered by a screen which has uniformly sized openings that are sufficiently large to allow the largest particles to pass through, yet sufficiently small to...http://www.google.es/patents/US6569494?utm_source=gb-gplus-sharePatente US6569494 - Method and apparatus for making particle-embedded webs
Method and apparatus for making particle-embedded webs
