Steam Evacuation in a Pulp or Fiber Refiner
AssigneeValmet Corporation
InventorKarl Lönngren
Life of this patent
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Abstract
A refining disc (6) in a defibrator (1) for refining fibrous material is provided with non-central openings (11) for allowing steam developed in the refining space (2) during refining to flow from the front side to the backside of the refining disc (6), where the front side is facing a second refining disc (5) and the backside is facing away from the second refining disc (5). The refining disc (6) also comprises a central hole (12) for allowing steam (8b) to flow from the backside to the front side at the rotational center of the refining disc (6), and escape from the defibrator (1) backwards through the feed screw (3a) without passing through the fibrous material (7) being refined in the refining space (2).
Claims8
A first refining disc in a defibrator for refining fibrous material, the first refining disc comprising a refining surface adapted to face a refining surface of a second refining disc, the refining surfaces defining a refining space between them and being adapted to refine the fibrous material, wherein the first refining disc is provided with at least one non-central opening extending from a front side of the first refining disc to a backside of the first refining disc, where the front side is adapted to face the second refining disc and the backside is adapted to face away from the second refining disc, for allowing steam developed in the refining space during refining to flow through the at least one non-central opening from the front side to the backside of the first refining disc, and a central hole located in a rotational center of the first refining disc and extending from the backside to the front side of the first refining disc, for allowing steam to flow through the central hole from the backside to the front side of the first refining disc at the rotational center of the first refining disc.
Dependencies are inferred from the claim text.