| 摘要 |
Refining elements are disclosed for use in the refining of fibrous material in which the refining elements include a pattern of bars and intermediate grooves between the bars. The bars extend in an arc-shaped direction outwardly over the refining element and the upper surface of the bars includes smaller grooves which form angles of from about 10° to 90° with respect to the longitudinal direction of the bars so that the smaller grooves on the bars extend substantially radially.
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