| 摘要 |
There is provided a method and apparatus for selective removal of materials present on an object A in one or more layers B by surface abrasion by projection onto the surface of the object A of a moving fluid composed of a gas and solid particles conveyed in the gas. The apparatus comprises at least two reservoirs ( 11,13,15 ) for solid particles ( 21,22,23 ) of at least two different sizes communicating with a single reservoir 30 trough conduits ( 24,25,26 ). Each conduit ( 24,25,26 ) has an obturator( 27,28,29 ) movable between open and closed positions and the single reservoir ( 30 ) is connected to a further conduit ( 36 ) provided with a nozzle ( 37 ) situated in the proximity of the surface layer B to be stripped. Particles ( 31 ) are mixed in "T" joint( 34 ) with gas from an air compressor ( 35 ) and directed out of the nozzle ( 37 ). The average granulometry of the particles ( 31 ) is adjusted, by removing and/or adding other solid particles, so as to adapt the average granulometry of the particles ( 31 )to the nature of the object A and/or the state of its surface.
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