Refiner plate with interspersed surface and subsurface dams
DCFirst Claim
1. A refiner plate segment for refining lignocellulosic material, comprising:
- at least one field consisting essentially of a pattern including a plurality of substantially radially disposed bars defining an upper surface, a plurality of substantially radially disposed grooves disposed intermediate said bars defining a lower surface, and at least one dam means traversing each of said grooves for restricting radial flow of said material through said respective grooves;
wherein each said dam means is one of either a full height dam extending from said lower surface to said upper surface or a partial height dam extending from said lower surface to a height intermediate said lower and upper surfaces, andwherein a plurality of grooves having a plurality of full height dams and no partial height dams are individually alternated with a plurality of grooves having a combination of full height dams and partial height dams.
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Accused Products
Abstract
A refiner plate for the face of a refiner disc comprising a plurality of refiner segments arranged side-by-side on the face of the disc to form a substantially annular refining region. Each refiner segment has an inlet zone for receiving the material to be refined, an outer zone for refining and discharging refined material and an intermediate refining zone disposed intermediate the inlet zone and the outer zone. The outer zone has a pattern including a plurality of radially disposed bars defining an upper surface, a plurality of radially disposed grooves disposed intermediate the bars defining a lower surface, and dams traversing each of the grooves for restricting radial flow through the respective grooves. The dams include full height dams extending from the lower surface to the upper surface and partial height dams extending from the lower surface to a height intermediate the lower and upper surfaces. At least one full height dam is disposed in each of the grooves, as the radially outermost dam. The grooves containing a combination of full height dams and partial height dams are generally alternated with grooves containing only full height dams, thereby providing an optimized functionality across the outer zone to enhance the flow of steam while retarding the flow of material.
24 Citations
14 Claims
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1. A refiner plate segment for refining lignocellulosic material, comprising:
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at least one field consisting essentially of a pattern including a plurality of substantially radially disposed bars defining an upper surface, a plurality of substantially radially disposed grooves disposed intermediate said bars defining a lower surface, and at least one dam means traversing each of said grooves for restricting radial flow of said material through said respective grooves; wherein each said dam means is one of either a full height dam extending from said lower surface to said upper surface or a partial height dam extending from said lower surface to a height intermediate said lower and upper surfaces, and wherein a plurality of grooves having a plurality of full height dams and no partial height dams are individually alternated with a plurality of grooves having a combination of full height dams and partial height dams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A refiner segment for refining lignocellulosic material, comprising:
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an inlet zone for receiving the material, an outer zone for refining and discharging material and an intermediate refining zone disposed intermediate said inlet zone and said outer zone; said outer refining zone having at least one field consisting essentially of a pattern including a plurality of substantially radially disposed bars defining an upper surface, a plurality of substantially radially disposed grooves disposed intermediate said bars defining a lower surface, and dam means traversing each of said grooves for restricting radial flow of said material through said respective grooves; wherein each said dam means is one of either a full height dam extending from said lower surface to said upper surface or a partial height dam extending from said lower surface to a height intermediate said lower and upper surfaces; and
whereinall of said grooves have a radially outermost dam means and wherein each of said outermost dam means is a full height dam; a plurality of grooves having a plurality of full height dams and no partial height dams are individually alternated with a plurality of grooves having a combination of full height dams and partial height dams. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification