Method for selective removal of materials present in one or more layers on an object and apparatus for implementation of this method

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 through 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.