Optimizing OCC Refining with Defloccing, TAPPICon24

Subjecting pulp to a high shear defloccing zone immediately after refining reduces the formation of dense flocs and results in more efficient refining. This defloccing phenomenon was originally observed to benefit softwood pulp refining, but it also applies to North American OCC. The combined results of several mill trials with OCC defloccing demonstrate the interactions between OCC refining intensity, defloccing technology, and other state‐of‐the‐art refining improvements. At the same refining intensity, defloccing OCC on 100% recycled machines increases OCC refining efficiency by 15%, with greater efficiency improvement on machines that use softwood as well as OCC. Furthermore, it is shown that the benefits of defloccing are additive to refining improvements made in the refining zone of a refiner plate. Most OCC refiner plate designs can therefore benefit from the addition of a defloccing feature.

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