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All paper and board machine refiners are hydraulic machines with high-speed rotating elements. They are similar to centrifugal pumps in that fluid friction and centrifugal forces have a considerable influence on their operation. Each refiner consists of one or more sets of rotating or rotor plates opposite one or more sets of stationary or stator plates. These plates are positioned very close together. As stick-stock is pumped between the plates. Bars and the plate surfaces treat the surface of the fibers, in order to expose greater amounts of surface area suitable for bonding. Besides fibers selection and pulping method, refining offers the best opportunity for paper makers to enhance the quality of the end product.