C4: CRITICAL CLEANING FOR CONTAMINATION CONTROL - The Basics of Rinsing - A Case Study

摘要

A familiar client called. He wanted me to be at his manufacturing plant ASAP to inspect his rinsing system, to tell his management that it was fine, and to stop bugging him about it. He said he was doing things the right way. My client's management had another point of view. They had nearly lost a major position in gold-plated connectors. Blame for plating quality was ascribed to carryover of soil components as dragout from the cleaning to the rinsing to the plating system. His plant had a five-stage countercurrent flow rinse bath system. His performance data purported to show that the water leaving with the rinsed parts was indistinguishable from virgin rinse water.