I have been discussing control charts with a few people lately and I thought it a good time to recall why we control chart. In general we control chart to determine if a process or product property is in control and there fore suitable for the customer or next production step if the part is being used in line. When we control chart we determine the statistical likelihood that a part being produced now is close to the last one made and the next one to be produced. This allows us to test fewer parts for compliance and prevents sorting.
If we don’t control chart or attempt to have an in control process, it becomes important to test frequently, perhaps more frequently than is necessary which is a cost and a loss of resources. If the process is out of control, then we know a certain fraction will be out of specification and we will have to sort out the product which is out of specification. This is a cost to the product and may make it non competitive.
Therefore the use of control charts are an important cost saver in production as it reduces the waste of limited resources and insures against waste. A process in control guarantees a product which is in specification. The wider the specification to the natural variation in the production process (6 sigma) helps insure product which is in compliance even if there is a production shift. This is termed the process capability.
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Dr. Mount is an independent consultant in the coextrusion, extrusion, film, metallization and film converting industries. He is a leader in the development of metallized films for barrier applications and film laminations. His expertise is in oriented film product and process research, the design and implementation of extrusion systems and coextrusion die specification and system specification including installation and start-up. He is also recognized for trouble shooting mono and biaxial orientated film and sheet coextrusion, melt casting and melt pinning, and film surface treatment by corona, flame and plasma systems. EMMOUNT Technologies, LLC offers consulting and technical training in film orientation, barrier technologies, coextrusion and extrusion and measures polymer melt viscosity with a capillary rheometer.
Eldridge has over 30 years industrial experience in the extrusion and orientation of polypropylene and polyester films at ExxonMobil Chemical and ICI Americas Film Divisions. He managed the intellectual property of Mobil Chemical Films Division and has courtroom experience as an expert witness. A frequent contributor to SPE ANTEC, AIMCAL and TAPPI conferences, he is a member of the SPE Extrusion Division Board of Directors, and a Fellow and Honored Service Member of SPE. Appointed AIMCAL Metallizing Consultant in 2001 and a past VP of the Society of Plastics Engineers. He has a Bachelors degree in Chemistry from West Chester University and a ME and PhD in Chemical Engineering from Rensselear Polytechnic Institute.
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