Methods and system for applying a uniform coating to a moving wo

Details Methods and system for applying a uniform coating to a moving wo Methods and system for applying a uniform coating to a moving wo

1995-04-24

1997-04-22

Beck, Shrive P.

Coating processes

Spraying

427286, 427424, 427600, 118305, 118323, 118324, B05D 700

Patent

active

056227523

ABSTRACT:
A printed circuit board ("PCB") is moved on a conveyor towards an ultrasonic spray head ("head") that is mounted below the PCB on a guide rail. The guide rail and the direction of motion of the PCB define an acute angle. When the PCB reaches a predetermined position, the head begins a motion across the PCB, spraying a rectangular swatch of soldering flux. The velocity of the head is controlled such that the swatch of flux is substantially perpendicular to the direction of motion of the PCB. After spraying, the head deactivates and reciprocates back across the PCB such that no flux is sprayed. The cycle repeats after a predetermined delay whereby adjacent swatches of flux do not substantially overlap.

REFERENCES:
patent: 2777419 (1957-01-01), Paasche
patent: 3184328 (1965-05-01), Wagner et al.
patent: 3722468 (1973-03-01), Middleton
patent: 4821948 (1989-04-01), Fisher et al.
patent: 4871105 (1989-10-01), Fisher et al.
patent: 5024856 (1991-06-01), Hohnerlein
patent: 5219120 (1993-06-01), Ehrenberg et al.
patent: 5460653 (1995-10-01), Otani et al.

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