Single-Disc Refiner

摘要

A single-disc refiner (1) has a stationary refining element (2) and an opposed rotatable refining element (12), each of which has a radially inner blade element (4, 14) providing an inner refining surface area and a radially outer blade element providing an outer refining surface area. The inner and outer refining surface areas of each refining element together provide a refining surface of the refining element, the refining surfaces defining a feed zone (29) followed by a treatment zone (30) with a transition point therebetween located at a radial distance of 70-90% from the center of the refiner or at a radial distance of 50-80% from the innermost edge (25, 27) of the refining element or at a radial distance of 20-50% from the inner edge (34) of the outer blade element (8, 18, 33) towards the outermost edge (26, 28, 35) of the refining element.

主权项

1. A single-disc refiner for refining lignocellulosic material for paper and board manufacturing, comprising:
a stationary refining element and an opposed rotatable refining element forming together refining elements, the rotatable refining element having an axis about which it rotates which defines a center of the refiner, and a radial direction extending radially from the axis, wherein each refining element comprises: at least one radially inner blade element having an inner refining surface area of the refining element, the inner blade element defining an innermost edge closer to the axis and a first outer edge further from the axis, in the radial direction; at least one radially outer blade element, which is further from the axis in the radial direction than the at least one inner blade element, and having an outer refining surface area of the refining element, the outer blade element defining an inner edge closer to the axis and an outermost edge further from the axis in the radial direction; wherein the inner refining surface area and the outer refining surface area of each refining element together forming a refining surface of the refining element; wherein the refining surface has in the radial direction from the axis, a feed zone followed by a treatment zone; wherein a transition point from the feed zone to the treatment zone is located at a distance in the radial direction which falls within at least one of: a radial distance of 70-90% of a radial length from the axis to the outermost edge in the radial direction; a radial distance of 50-80% of a radial width from the innermost edge of the refining element to the outermost edge in the radial direction; and a radial distance of 20-50% of a distance from the inner edge of the outer blade element to the outermost edge in the radial direction.