Chapter 3. Statistical Process Control of Batch Weighments

  1. John B. Wachtman Jr
  1. Richard K. Peelle

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310533.ch3

Proceedings of the 49th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 10, Issue 3/4

Proceedings of the 49th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 10, Issue 3/4

How to Cite

Peelle, R. K. (1989) Statistical Process Control of Batch Weighments, in Proceedings of the 49th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 10, Issue 3/4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310533.ch3

Author Information

  1. Corning Glass Works

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374849

Online ISBN: 9780470310533

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Keywords:

  • ingredient;
  • probable;
  • statistical;
  • calibration;
  • distribution

Summary

Statistical Process Control (SPC) is an important tool used by Corning in the establishment and maintenance of accurate batch weighments. The control systems used by our latest batch system designs incorporate PLC controls. In addition to controlling the weighing process, the PLC serves as a data collector and interface to an SPC computer. The data transmitted includes the set points or targets as well as the individual weight of each ingredient in each batch. The SPC computer massages this data and produces charts which indicate the stability of the process. The charts are produced on an ingredient basis and the standard Western Electric (WECO) rules for nonnatural error distributions are applied and out-of-control points identified. Operators and engineers use this information to take corrective action and to fine tune the system.