A system and process is disclosed for binding particles to a carrier material in an isolated relationship for use in composite fabrication. A slurry comprising particles dispersed in fluid is created in particle suspension tanks, deposited as a uniform layer and filtered using reduced pressure applied to a filter belt to leave behind isolated particles, the reduced pressure further acting to overcome electrostatic and other forces of attraction between the particles until they can be permanently bound to the carrier with a binder or adhesive and collected on a take-up roll.