Abstract: A method for refining aqueous suspended cellulose fibers including the step of guiding the fibers in an aqueous suspension between refiner fillings. The refiner fillings are provided with refining strips and interposed grooves and are located either on a rotor or a stator. The refiner fillings are caused to be rotatably moved relative to each other and pressed against each other, thereby transmitting mechanical a refining action to the cellulose fibers. The refiner fillings include barriers in at least part of the grooves, the barriers closing the grooves at least partially.

Abstract: A method for refining aqueous suspended cellulose fibers including the step of guiding the fibers in an aqueous suspension between refiner fillings. The refiner fillings are provided with refining strips and interposed grooves and are located either on a rotor or a stator. The refiner fillings are caused to be rotatably moved relative to each other and pressed against each other, thereby transmitting mechanical a refining action to the cellulose fibers. The refiner fillings include barriers in at least part of the grooves, the barriers closing the grooves at least partially.

Abstract: The invention relates to an arrangement for fractionating a suspension of fibrous material suitable for creating a web of paper, board, tissue or some other fibrous material into a short fiber fraction with a high proportion of short and/or stiff fibers and/or vessel cells and a long fiber fraction with a high proportion of long and/or flexible fibers, comprising a screen element with screen openings which is taken past at least one nozzle which directs a jet of the fibrous material suspension onto the screen element, wherein the long fiber fraction is collected on the side of the screen element that is facing the nozzle and the short fiber fraction is collected on the opposite side of the screen element.