Better Control of De-Inking by Using BT 5300

Abstract

It is recognized that brightness measurement alone is insufficient for evaluation of the effectiveness of the de-inking process. As ink is removed by the flotation process, the brightness of the pulp increase. However, there are certain limitations with the use of brightness as the only parameter. Brightness is a macro measurement, and can be affected by other components such as ash. There is no direct correlation between brightness and ink content. A more effective way of measuring, the efficiently of the process, is the effective residual ink concentration “ERIC”. By combine brightness and ERIC measure-ment it should be possible to predict the edge brightness, or the infinite flotation bright-ness. With BTG system BT 5300, it is possible to do both ERIC and brightness measure-ment simultaneously. If additional measurements of ash and fiber, in feed to and the accept from, the flotation cells, can gather with the above mentioned on-line measure-ments, it give the possibility for an effective way of controlling the flotation process.For ash and fiber measurement, the BTG LCA 5300 and TCT 2300 will be presented.