Abstract: A method for detecting and removing foreign particles in polymeric resin powder comprising drying the resin powder; removing static energy from the resin powder; producing a layer of resin powder 0.2 to 0.8 mm in height in a feeding tray which feeds a conveyor; conveying the layer of resin powder with a transparent conveyor belt at a speed of between 12.2 and 36.64 meters/minute into a foreign particle detection zone; illuminating the polymeric resin powder in the detection zone from above and below with a light; continuously imaging the resin powder from above with a high speed digital CCD camera; continuously analyzing the images with a control device to detect particles having nonwhite colors; and actuating a suction system with the controller to suction off any detected particles to produce a polymeric resin powder having a reduced number of foreign particles.