Patent ID: 6197376
Filing Date: 2001-03-06
Classification: B05B,Y02P

Abstract:
Process for covering a surface (1a) of a substrate (1) with a layer (2) of a fluid material, according to which:(a) with a confining wall (3) closed up on itself, arranged some distance from and above the surface to be covered (1a), and whose lower edge (3a) forms together with the latter a peripheral void (4), is defined a treatment chamber (5) delimiting an area (6) to be treated on the said surface to be covered(b) a controlled vacuum is established inside the treatment chamber (5) by admitting an incoming gas stream (7) via the peripheral void (4), and by extracting an outgoing gas stream (8) from the treatment chamber, so as to obtain an internal pressure in the said chamber which is lower than the external pressure(c) a turbulent mixed flow between a fluid stream (10), comprising the fluid covering material, and a gas stream, is formed in the treatment chamber (5) under vacuum, the said turbulent mixed flow coming into contact with the developed surface (1b) in the area (6) to be treated, depositing the fluid material thereat, and then being discharged with the outgoing gas stream (8)characterized in that the fluid stream (10) is introduced in a controlled manner at the level of the peripheral void (4), between the lower edge (3a ) of the confining wall (3) and the surface to be covered (1a), the said controlled fluid stream forming, together with the gas stream (7) entering via the said void, the turbulent mixed flow, which is aspirated into contact with the developed surface (1b) in the area (6) to be treated.