Analysis of Pulp Components in a DIP Process with Tube Flow Fractionation, 2007 TAPPI 8th Research Forum on Recycling

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The aim of this study was to clarify how the aging of raw material affects the behaviour of paper components in pulping and flotation. The main measurement method in the study was tube flow fractionation which classifies pulp gently according to particle size, and allows gathering separated fractions for microscopy study and image analysis. The study showed that aged raw material has considerably poorer properties in sense of slushing rate. The amount of attached ink particles was higher in case of aged material than fresh material. Also ink removal efficiency in flotation was lower with the aged raw material than fresh material. Due to these two reasons the aged material had lower brightness of pulp than fresh material.