MEASUREMENT OF COLLOIDAL CHARGE IN THE PAPER MILL BY STREAMING CURRENT

摘要

The colloidal charge of process water within a paper mill can profoundly affect process efficiency and product quality. With increased pressure for productivity and reduced costs the need for accurate and reliable charge measurements has become more urgent. But the paper machine environment presents challenges that may limit the accuracy of such tests. Recently the streaming current method has become the most widely used means of charge analysis. This report presents new data, helping to define the range of sample types and electrical conductivity where it is possible to achieve accurate and reliable results from streaming current titrations. Within the limits of these ranges the results are consistent with a model of polyelectrolyte adsorption onto the plastic probe surfaces of the test instrument. Outside of these limits the results may be unreliable.