— Micro-feeding of a fine powder was experimentally investigated by use of a capillary tube (≤ 1.6 mm in diameter) as an powder exhaust pipe that was vibrated under conditions of less than 760 Hz and 30 μm in amplitude. ... [10,11], screw conveyor [12,13], conveyor belt [14,15], vibration feeder [16–18], etc. In the past, the old vibrating ...