Case Studies

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  1. Rheology of Guar Solutions

    January 1980
    The rheology of aqueous solutions of guar is studied over a wide range of shear rates and concentrations.
    Authors: Whitcomb, Patrick J.; Gutowski, John; Howland, Warren W.
    Publication: Journal of Applied Polymer Science
  2. How to Document Process Monitoring and Control Systems

    September 1981
    Maximize plant capability and efficiency by developing specifications for all aspects of a process.
    Authors: Anderson, Mark J.; Whitcomb, Patrick J.
    Publication: Chemical Engineering
  3. Experiments Uncover Source of Valve Failures

    June 1988

    Fluoroware Ind. manufactures plastic trays, tubing, fittings, pipes, and valves that are used by semiconductor companies to contain, protect, and transport wafers, magnetic disks, and fluids. In addition to being very pure to avoid contaminating the sensitive materials that they carry, these products are often required to withstand harsh chemicals and high temperatures during the course of normal usage.

    Avaialble upon request—reprint #42 (LDB-913)

    Authors: Fluoroware
    Publication: Quality
  4. The Role of Pure Error on Normal Probability Plots

    January 1992

    A look at augmenting the usual probability plot effects with points representing pure error.

    Authors: Whitcomb, Pat & Larntz, Kinley
    Publication: Conference
  5. A Simple Comparative Experiment with Paper Clips

    January 1992
    Stat-Ease, Inc. uses millions of paper clips per year.
    Authors: Anderson, Mark J.
    Publication: Stat-Ease Inc.
  6. Analyzing Two-Level Factorials Having Missing Data

    January 1993
    Analyzing Two-Level Factorials Having Missing Data, an abstract of a paper to be given at the 37th Annual Fall Technical Conference
    Authors: Larntz, Kinley; Whitcomb, Patrick J.
    Publication: ASQC Fall Tech. Conf., St. Louis
  7. Optimizing Plasma Sprayed Alumina-Titania Coatings Using Statistical Methods

    June 1993
    A statistical design of experiment study of the plasma spraying of alumina-titania powder is presented.
    Authors: Anderson, Mark J.; Whitcomb, Patrick J.
    Publication: Reprint - Anaheim, CA Conference, June, 1993
  8. Applying DOE to Microwave Popcorn

    July 1993

    Process Industries (PI) Quality.

    Authors: Anderson, Mark J. & Anderson, Hank P.
    Publication: Process Industries Quality
  9. Optimizing Formulation Performance with Desirability Functions

    August 1993
    Formulators often must make tradeoffs between conflicting performance measures. This paper illustrates how multiple response measures can be combined into one objective function, called "desirability", which can then be optimized by univariate techniques. The methodology consists of several basic steps: - Develop predictive models for each response - Transform each response to a desirability scale - Mathematically combine the individual desirability measures in to one overall index - Use numerical optimization methods to find the formulation that produces maximum overall desirability. By way of a case study on material used to make pipe, the paper shows how to generate models from statistically designed mixture experiments. Then by application of desirability functions, the optimum combinations of ingredients become apparent. Two and three dimensional surface maps, generated from commercially available personal computer software, will be illustrated.
    Authors: Anderson, Mark J.; Whitcomb, Patrick J.
    Publication: Quebec Metalurgical Conference
  10. A Balancing Act: Optimizing a Product's Properties

    June 1994

    Quality Progress. 2002 American Society for Quality. Reprinted with permission.

    Authors: Derringer, George C.
    Publication: Quality Progress
  11. Mixture Design -- Simple as Pound Cake

    December 1995

    Design-Expert, mixture design, desirability

    Authors: Anderson, Mark J.; Whitcomb, Patrick J.
    Publication: Unpublished
  12. Robust Design - Reducing Transmitted Variation

    May 1996

    Talk by Pat Whitcomb and Mark Anderson that was presented at the 50th Annual Quality Congress.

    Authors: Anderson, Mark & Whitcomb, Pat
    Publication: Conference
  13. Optimization of Paint Formulations Made Easy with Computer-Aided Design of Experiments for Mixtures

    July 1996

    Powerful desk-top software now makes it easy to optimize paint formulations. Coatings researchers can use the computer to apply statistically based design of experiments (DOE) for mixtures-a proven method for making breakthrough improvements in cost and performance. This paper shows the application of the latest technology of computer-aided mixture design to data from Hesler and Lofstrom's 1981 article "Application to Coatings Research." In the process the essential aspects of mixture methodology are illustrated.

    Authors: Anderson, Mark J.; Whitcomb, Patrick J.
    Publication: Journal of Coatings Technology
  14. Optimize Your Process-Optimization Efforts

    December 1996

    What would you do it confronted with an "opportunity" like this? A chemist compound in the laboratory. The marketing people anticipate big profits but only if the product can be made economically at high yields. The chemist provides a very basic recipe sheet with suggested conditions. Your job is to scale up the process as quickly as possible. Or, what if you face a different opportunity? A competitor makes a minor, but noticeable, improvement to its product while simultaneously reducing its price. Your sales group fears that your product might get knocked out of the market. Your job is to fine-tune the existing process at the plant to get more yield with better product quality.

    Authors: Anderson, Mark & Whitcomb, Pat
    Publication: Chemical Engineering Progress
  15. Software Sleuth Solves Engineering Problems

    June 1997

    This article appeared in Machine Design.

    Authors: Anderson, Mark & Whitcomb, Pat
    Publication: Machine Design

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