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Getting Clean Parts
- 1. Getting Clean Parts and Getting Parts Clean Roger Welker, Principal Scientist R.W. Welker Associates [email_address]
- 6. Reference Chapter 5: Getting Clean Parts and Getting Parts Clean in “ Contamination and ESD Control in High Technology Manufacturing”, (Wiley, Hoboken, 2006) ISBN-13: 978-0-471-41452-0
- 10. Getting Clean Parts and Getting Parts Clean – Cleaning Strategies High Contam. Level Level In-coming Low Contam. Level 1 10 50 90 99 % Removal Sigmoidal (meaning S shaped) Cleaning Efficiency Curve How do they do get such high cleaning efficiencies? Where cleaning equipment vendors advertise. Does opportunity for improvement exist? Where most cleaning processes actually work. 20 to 80 % Removal Efficiency
- 12. Getting Clean Parts and Getting Parts Clean – Cleaning Strategies High Contam. Level Level In-coming Low Contam. Level 1 10 50 90 99 % Removal Why it is important to know in-coming cleanliness level and percent removal efficiency is fairly low Where most cleaning processes actually work. 20 to 80 % Removal Efficiency Over a narrow range, cleaning efficiency curves appear to be linear
Editor's Notes
- Roger is founder and principal scientist at R. W. Welker Associates. Prior to joining the disk drive industry in 1982, he spent 11 years in applied research and development, mostly as an aerosol scientist. While in the disk drive industry he became widely recognized as one of the foremost experts on contamination control, electrostatic discharge control and materials science. He has applied his expertise in these disciplines for over 26 years to semiconductors, disk drives, direct materials and consumable supplies, continuous monitoring, flat panel display, the precision chemicals industry and most recently, 6 years for the National Air and Space Administration. He returned to the disk drive industry in 2007 after 10 years of consulting. He has worked in many functions in high-technology industries, including manufacturing technology research, process development, product development, manufacturing engineering, quality assurance, supplier quality engineering and marketing. He originated many techniques that have emerged as industry standards, including analytical methods for specifying cleanroom gloves, swabs and wipers, and the widely circulated and practiced, “Guidelines for Design and Certification of Tooling for Cleanroom Use”. He is the author of more than 60 papers and presentations on contamination and ESD control. He is principal author of, “Contamination and ESD Control in High-Technology Manufacturing”, published by John Wiley and Sons, in Oct. 2006. Much of the material in this presentation appears in chapters 3, 5 and 8 in that book, though in highly abbreviated and not so colorful form.