Influence of Suspension Non-Uniformity on Sheet Structure

The subject of this paper is a study of the properties of paper sheets made from suspensions of a known state of flocculation, the sheet formation being performed under controlled conditions. The delay time between end of agitation and start of drainage and the rate of drainage were varied. The flocculation of the sheet increased with delay time and decreased with increasing drainage rate, indicating a strong qualitative relation between these two phenomena in their influence upon flocculation. The flocculation of sheets increased linearly with the flocculation of suspensions, a quantitative comparison showing that the state of flocculation represented in terms of mass distribution improved during drainage. Tensile strength increased with decreasing flocculation, tear decreased, porosity passed a minimum at intermediate flocculation.