振動毛細管を利用した微粉体の微量定量供給
1995 年 32 巻 2 号 p. 83-88
詳細
1995 年 32 巻 2 号 p. 83-88
Micro feeding of a fine powder was experimentally investigated by use of a capillary tube (≤1.6mm in diameter) as an exhaust pipe which was vibrated under the conditions of less than 760Hz and 30μm in amplitude.
It was found that only the particles near the inside wall vibrated at random, and almost all inner particles were transported as a lump of powder. Particles of 10μm in diameter could be discharged continuously at a rate of 0.2mg·s-1. It was also found that the critical frequency for discharging was nearly inversely proportional to the square root of the vibration amplitude. The powder flow rate could be increased with increasing frequency. However, there was a maximum flow rate which depended on the capillary size d and the kinds of powder. The maximum flow rate was found to be proportional to dn where n=2-2.5.
