| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of polishing a surface capable of removing an accretion, such as a shell and rust, which adhere to the surface while reducing dust, noise and vibration substantially. SOLUTION: Abrasive material, that is, silica sand is fed to a tapered cone- shaped nozzle 1 in high pressure air set at an atmospheric pressure ranging from 5 to 10, and water is also fed to the nozzle 1. A ratio of the abrasive material K to the water is set at about 95 to 5 by weight, and the abrasive material K mixed with the air and the water is ejected toward the accretion to remove the accretion and to polish the surface.
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