‘Just in Time’ Cleaning Improves the Yields in Fine Line Circuit Manufacture

The purpose of this paper is to identify the major parameters which affect the chances of contamination occurring, and then to evaluate conventional cleaning techniques with respect to these factors. The paper will next describe a new approach to contamination control which minimises the risk of contamination in a cost‐effective manner. In conclusion, some aspects of the circuit board manufacturing process which are particularly sensitive to contamination and which may benefit from the application of ‘Just in Time’ cleaning are described.