Patent ID: 6997780

Claim:
A method of treating a solid surface by impingement of a particulate stream thereagainst, especially for removal of material and/or compaction and/or coating, for example the removal of paint defects from lacquers, the smoothing of solder and solid seams, removal of contaminated concrete layers or rust layers, solidifying, leveling or coating of metallic surfaces, in which a particulate agent is metered into a carrier airstream generated by a subatmospheric pressure by means of gravity and/or an injector effect, is conveyed to a jet lance in a flexible piping system and is directed through a blast chamber set on a surface to be treated and maintained under a subatmospheric pressure and from there is returned in the air-stream, cleaned and optionally fed in a circulating path, whereby the acceleration of the agent is produced by the suction pressure and the blast chamber is shifted from surface to be treated to surface to be treated, wherein the agent is given at least an additional energy pulse by at least one further gas stream at atmospheric pressure other than that which is drawn in by suction at subatmospheric pressure to reach an end velocity considerably greater upon impingement against said surface than the carrier airstream velocity upstream from the metering location whereby the energy input to the surface to be treated is adjusted with a function of the nature and shape of the surface to be treated as parameters and the nature of the agent, the degree in which the carrier air stream is charged with the agent, the subatmospheric pressure, the treatment duration and the treatment temperature.