Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1979-11-16
1981-11-24
Kashnikow, Andres
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
239 3, 239 8, 239704, 239112, 427201, 427424, B05B 502, B05B 1502, B05D 106
Patent
active
043024815
ABSTRACT:
A method and apparatus are disclosed for spray coating one or a series of objects with at least two powder coating materials in succession or alternately. When a change of the material being sprayed is to be effected, the flow of the first material is terminated, preferably by means of a squeeze valve, the flow path of the first material is flushed with a fluid, preferably air, and the second spray material is sprayed. The relative positions of the apparatus forming the respective flow paths of the two spray materials are not changed during this process. In one preferred embodiment, feed conduits corresponding to respective spray materials converge into a single delivery conduit. Each feed conduit includes means for closing and opening it. Means are provided for flushing at least part of a given feed conduit, or the delivery conduit, or both, with a fluid. The flushing can preferably be done pulsatingly.
REFERENCES:
patent: 3746254 (1973-07-01), Duncan et al.
patent: 4125125 (1978-11-01), Ezekoye et al.
Buschor Karl
Giesinger Hans
Ribnitz Peter
Gema AG
Kashnikow Andres
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