Method for cleaning electronic and other devices

Details Method for cleaning electronic and other devices Method for cleaning electronic and other devices

1989-03-06

1991-09-03

Morris, Theodore

Cleaning and liquid contact with solids

Processes

Using sequentially applied treating agents

134 21, 134 254, 134 32, 134 40, 134 73, B08B 302, B08B 304

Patent

active

050451200

ABSTRACT:
A method and apparatus for cleaning workpieces, particularly printed circuit boards upon which electrical components have been soldered, is capable of using a potentially flammable or explosive liquid cleaning solvent. In one embodiment, there are two immersion wash stages between which is a spray wash stage. The spray wash stage is formed as a closed chamber which is sealed when the immersion wash stages by liquid seals. To reduce the danger of fire or explosion in the spray wash stage an inert gas such as Nitrogen is introduced into the closed chamber. In another embodiment the spray nozzles are immersed in liquid solvent in a combined immersion/spray wash stage. This reduces atomization of the flammable solvent further reducing the danger of fire or explosion.

REFERENCES:
patent: 3021235 (1962-02-01), Schumacher
patent: 4319930 (1982-03-01), Yano et al.
patent: 4589926 (1986-05-01), Holmstrand
patent: 4861385 (1989-08-01), Yagishita

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