High Performance Forehearth Colouring Using Lorentz Forces

In the production of coloured glasses with high performance forehearths, glass colour is added in the melt zone by means of metal oxides that are embedded in a glass matrix (frits). They tend to sink, depending on the homogenisation done by the stirring battery and contaminating the glass when they sediment. In this article the authors discuss the use of a Lorentz force to create a push-up effect, thereby preventing the sinking process.