| 摘要 |
In a refiner having ribbed refining disks to form a refining zone between such disks, the refining spaces of such disks including radial ribs forming grooves between them, which grooves are blocked at intervals by dams connecting the ribs at opposite sides of the grooves, and intergroove slots connect neighboring grooves in an arrangement to provide venting passages for steam forming a zigzag course which bypasses the refining zone between the refining disks.
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