Browsing by Author "Roger, Ulrich"
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- ItemGlass conditioning by viscosity controi(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1996) Roger, Ulrich; Hessenkemper, Heiko; Roth, PeterDuring the forming process of a glass melt the viscosity is the dominant process parameter. Up to now in the industrial Container glass production only temperature-controlled Systems have been used. With these control elements only thermally induced variations of the viscosity are visible. Variations in the composition, the redox State , the water and the SO₃ content in the melting process cause a shift in the viscosity Up to now these changes have not been detectable and therefore, it has not been possible to compensate them. Α measuring device for t he continuous determinadon of the viscosity in the glass was developed and tested for several months in a Container glass plant. All measured variations of the viscosity can now be corrected by the existing control elements for the thermally controlled glass conditioning. Dependent on the posidon of the viscosimeter in the feeder Channel , a feedforward or feedback Controlling concept is practicable.
- ItemValidation of a mathematical glass tank model(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Bauer, Johannes; Roger, Ulrich; Simons, PhilipIn the past mathematical modelling of glass furnaces concentrated on the redesign and optimization of such aggregates. For the future, it is conceivable that such models will also be used for the control of glass furnaces. The present study showed that an increased occurrence of bubbles due to increased glass pull can be found in the results of the model, while a corresponding link between model and practice could not be found for solid inclusions. As a main cause for the limited correspondence between modelling and practice the dominating influence of recycled cullet and the frequent changes of the glass pull could be identified.