| 摘要 |
A pair of opposed co-operating refining elements (1, 2) intended for a disc refiner for the disintegration and refining of lignocellulosic material in a refining gap between two opposed counter-rotating refining discs. The refining elements are intended to be placed directly in front of each other on opposed refining discs, and both refining elements (1, 2) are formed with refining surfaces with bars (3, 4) and grooves. In order to prevent generated steam from flowing rearward in the refining gap, a first refining element (1), which is intended for a rotary refining disc, is formed with a first radially restricted zone (7) with elevated bars (8) and a second radially restricted zone (9) without bars directly outside the first zone (7). A second opposed refining element (2) is formed with a third radially restricted zone (10) without bars, which third zone (10) is located directly in front of the first and the second zone (7, 9) on the first refining element (1).
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