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OptiSizer Hard uses higher nip loads to improve sheet strength properties by taking advantage of better starch penetration in the base sheet. The deflection compensated rolls with hard covers give high loading capacity and good profile features resulting in excellent runnability. This sizing solution offers lower energy costs and raw material savings, good strength and quality properties, and lower maintenance costs.
https://www.valmet.com/board-and-paper/board-and-paper-machines/sizing/optisizer-hard-nip-sizing/
