6 research outputs found
Recommended from our members
Glass conditioning by viscosity controi
During 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
Recommended from our members
stress generation modulus as a counterpart of the stress relaxation modulus
In order to measure the time dependence of the stress relaxation modulus, E, a stress-strain deformation has to precede which induces a stress within the viscoelastic sample from which the sample relaxes. The generation of stress is characterized by a strain rate-dependent and relaxation rate-dependent portion which exhibits a maximum value, E_max, which is called "stress generation modulus". E_max was called the "maximum stress relaxation modulus" in earlier papers. Meanwhile, however, it turned out that a better verbal distinction should be made in future by the new term "stress generation modulus" because E_max is about one order of magnitude larger than E