Dispersion Profile
The relative proportion of different particle dimensions within a suspension of pigments or filler materials determines the final smoothness, opacity and structural integrity of a coated paper sheet. Analyzing the particle size distribution of clay or calcium carbonate helps mill engineers control the viscosity of the coating color before it is applied to the paper web. A balanced mix of fine and coarse particles ensures optimal surface coverage and ink receptivity during printing.
Separation Efficiency
Recycling operations also depend on this measurement to evaluate how effectively deinking and screening systems remove ink and stickies from the pulping slurry. Tiny ink particles are easily separated by flotation, while larger specks require mechanical screening or centrate separation. If the distribution shifts toward intermediate sizes, traditional cleaning systems can fail, leaving visible defects in the finished paper.
Monitoring the spread of sizes ensures that screens and cyclones are set up with the correct slot widths and pressure drops.
Paper Quality
Optical performance and gloss of the finished sheet depend on having a highly uniform particle spread. A very narrow distribution can lead to poor coating adhesion and ink mottling during high-speed printing. In contrast, too wide a distribution increases coat weight without adding to the opacity or brightness of the finished print substrate.
