| 摘要 |
PCT No. PCT/DE97/00524 Sec. 371 Date Oct. 8, 1998 Sec. 102(e) Date Oct. 8, 1998 PCT Filed Mar. 5, 1997 PCT Pub. No. WO97/32512 PCT Pub. Date Sep. 12, 1997A negative pressure ring is formed around the surface to be cleaned and an air flow loaded with solid particles is directed onto the surface, which based on its kinetic energy treats the surface without mechanical support means such as brushes. At overpressure the air flow creates an air-cushion-like volume flow, rotating or travelling along predetermined paths, at negative pressure a volume flow is continuously guided over the surface to be cleaned. By admixing solid particles and cleaning and maintenance agents to the air flow, the substrate can be cleaned and maintained. With the process of the invention it is possible to perform several treatment steps in a single operation. The overpressure process works periodically, the negative pressure process in a complete closed cycle, wherein the solid particles are cleaned in an environmentally friendly manner and recycled into the process. |
