METERING METHOD FOR PARTICULATE MATERIAL

摘要

There is provided a method for metering a quantity of a particulate material onto the surface of a porous retainer comprising the steps of: exposing a first surface of a porous retainer to a pool of particulate material; applying a vacuum to a second surface of the porous retainer to meter material on the first surface; and adjusting the level of the vacuum to regulate the quantity of material metered on the retainer.