Pan Pacific Symposium Conference Proceedings


Authors: Ed Kanegsberg and Barbara Kanegsberg,
Company: BFK Solutions
Date Published: 2/13/2001   Conference: Pan Pacific Symposium

Abstract: Those involved in microelectronics fabrication and assembly face increasingly stringent, conflicting performance, economic, and environmental requirements. It often seems that steps to improve one of these factors degrades the others. A process is sometimes selected primarily to meet certain pressing environmental regulations, without consideration of efficiency or effectiveness. In such cases, product quality may deteriorate, costs may increase, and the environment may suffer. A process which gives the best performance, can also be environmentally sound and be low in cost. The challenge is to meet all of the requirements while optimizing the production system. In order to achieve these multiple goals, the question of "how clean is clean?" must be answered for the individual application

One key is to consider and understand the total process by gaining an awareness of the stages of knowledge in terms of specific cleaning and contamination control issue.

Suggestions for optimizing surface cleanliness include elimination of redundancy, analytical monitoring to assure cleanliness, automation, and designing a product to minimize contamination control. Appropriate process design has allowed companies to reduce process steps and chemical usage.

Regulatory agencies may not consider the importance of choices in solvency, but a solvent which is environmentally preferred but does not remove the soil or damages the part is useless. Some tools to gauge solvency are provided to assist in appropriate selection of the cleaning agent. In addition, solvent containment and adopting cleaning systems for low flashpoint solvents have enabled companies to extend the use of environmentally-preferred cleaning agents or to use classic solvents in what is essentially a non-emissive manner. Filtration and recycling are important to extend the life of the cleaning agent. If an expensive chemical can be contained or recycled, it can last for many cleaning cycles and there is likely to be less impact on the environment.

Developing a more effective process requires an encompassing approach, coordinating the efforts of many groups within the company. This is best accomplished during process design rather than as an afterthought.

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