Chuck Norcutt wrote:
>Reminds me of IBM's "silver migration" problem of the early 70's...... The
>vibration from the passing train caused years of accumulated contaminants in
>the exhaust stacks of the curing ovens to shake loose and fall as fine soot
>onto the parts as they were moving through the ovens. The soot caused a
>chemical reaction with the circuit line paste that, a year or so later, would
>cause physical migration of the silver particles away from the point of
>electrical contact. Case solved. Clean the stacks. Lesson learned.
>Extensive detail in manufacturing quality control records may not be
>overkill.
>
>
Great story!
Of course, it should never have happened. Extensive thought and care in
the QC itself would have avoided the problem in the first place. Proper
QC for any process using vent hoods includes regular scheduled
inspection and cleaning of the hood, fans, flues, stacks, etc.
Moose
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