Cleaning and liquid contact with solids – Apparatus – Automatic controls
Patent
1988-06-02
1990-11-20
Stinson, Frankie L.
Cleaning and liquid contact with solids
Apparatus
Automatic controls
134 94, 134111, 134180, 134199, 134200, B08B 302
Patent
active
049710834
ABSTRACT:
An apparatus and method for cleaning solder paste from stencils, screens, misprinted circuit boards, and tools associated with the manufacturing of surface mount technology circuit boards. The apparatus includes a holder assembly for holding the solder-laden objects during cleaning and rotatable spray arms connected with a chemical pump for spraying a transversely directed, cyclic waves of solvent onto the object's surfaces. The cleaning action of the spray arms permits use of the solvent at or below room temperature thereby substantially reducing evaporative loss of solvent, environmental injury resulting from such evaporative loss, and exposure of workers to solvent vapors. The apparatus includes filters for filtering heavy metal particles washed from the objects to contain the heavy metals for safe disposal. Safety mechanisms are included in the apparatus to prevent worker injury. The apparatus includes a timer/control unit which automatically controls the sequence and duration of the apparatus' components during a cleaning cycle. The method includes cleaning of solder paste by cyclically exposing the object surfaces to jets of solvent at directions constantly transverse to the surfaces thereby creating wavefronts of solvent which mechanically wipe solder paste from the surfaces.
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Johnson Jay R.
Stach Steven R.
Austin American Technology
EMC Domestic, Inc.
Stinson Frankie L.
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