Improving TMP Rejects Refining Through Alkaline Peroxide Pre-treatment for Value-Added Mechanical Papers, 2007 International Mechanical Pulping Conference

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We conducted pilot plant trials to clarify the effect of alkaline peroxide pretreatment on TMP rejects. Different alkaline and peroxide charges were applied to the rejects before refining. The study showed that a 2.2% total alkali charge was not sufficient to achieve noticeable energy reduction or physical property improvement. However, at a total alkali charge of 5.2%, alkaline peroxide pretreatment reduced the specific refining energy by 20% to a given freeness, and increased pulp density and tensile strength, most likely as a result of increased fibre flexibility and conformability. With a peroxide charge of 2.9%, the brightness of the refined rejects reached 72%. However, alkaline peroxide pretreatment decreased light scattering and pulp yield.