Meet Defloccers: Improving Refining Efficiency with Defloccing Refiner Plates Using Various Fiber Blends, 23TAPPICon
Conventional refining creates fiber flocs. For short fibers, such as hardwood, these flocs are likely to break up quickly after the refiner and be of no consequence. For stocks that contain softwood, however, even including North American OCC, adding a deflocculating zone at the exit of a refiner plate can improve energy efficiency. A “defloccer” is a refiner plate set that incorporates a deflocculating zone. Defloccers have been implemented in dozens of refiners so far. In the present work, we examine results from various treatments of fiber blends, including blending deflocced softwood with short fibers, defloccing softwood then co‐refining with short fibers, and co‐refining a blend of softwood and short fibers within a single defloccer. These examples show benefits in reduced refining energy, increased speed, and/or increased specific sheet strength that are similar to defloccing a pure stock in a single stage before the machine. The benefits of defloccing are thus available to a wide range of furnish blends and are not greatly affected by the order of stock blending and co‐refining.
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