Chapter 7. The Effect of Shear Angle on Gob Formation

  1. John Kieffer
  1. Matthew R. Hyre and
  2. Kenneth Paul

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294598.ch7

A Collection of Papers Presented at the 60th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 21, Issue 1

A Collection of Papers Presented at the 60th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 21, Issue 1

How to Cite

Hyre, M. R. and Paul, K. (2000) The Effect of Shear Angle on Gob Formation, in A Collection of Papers Presented at the 60th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 21, Issue 1 (ed J. Kieffer), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294598.ch7

Author Information

  1. Emhart Glass, Windsor, Connecticut

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375662

Online ISBN: 9780470294598

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Keywords:

  • gob formotion;
  • bottles;
  • drinking ware;
  • geometry;
  • viscosity

Summary

The effect of feeder orifice ring orientation on gob formation was investigated using several numerical codes. Variations in gob weight between orifices were found to be due to deviations in gob temperature profiles. These deviations, due to a difference in glass residence times between orifices, were found to significantly change the viscosity distribution and manner in which the gob is formed as it flows from the feeder. Numerical models have showed that variations in gob properties between orifices can be reduced by the careful design of feeder internals. A new feeder has been developed that significantly reduces thermal variations between orifices. It has the additional benefit of reducing gob bowing, which is caused by asymmetric velocity and pressure gradients at the orifice ring.