Refiner plate with variable pitch
DCFirst Claim
1. A rotating disc refiner segment for refining a lignocellulosic material with production of steam which is transported substantially radially along the segment, the segment comprising:
- a plurality of substantially radially extending bars and a plurality of substantially radially extending channels disposed intermediate said bars to form a pattern of bars and channels, each said channel having a channel width and a lower base surface at the bottom of said channel, each of said bars having a top surface and substantially radially extending first and second edges, the top surface of at least one of said bars having at least one radially extending groove formed therethrough intermediate said first and second edges, each of said grooves having a groove width and an intermediate base surface disposed at a height intermediate said top surfaces and said lower base surfaces, said groove width being less than said channel width at a corresponding relative height of said channel;
whereby significantly more steam is transported substantially radially outwardly through the channels than through the grooves.
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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 inner refining zone for receiving the material to be refined and an outer refining zone. The outer refining zone has a plurality of radially disposed bars defining an top surface and a plurality of radially disposed channels disposed intermediate the bars defining a lower base surface. At least one of the top surfaces has at least one radially extending groove defining a pair of blades and an intermediate base surface at the bottom of the groove. The intermediate base surface is positioned at a height intermediate the top surface and the lower base surface. The width of the grooves are narrower than the width of the channels.
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Citations
18 Claims
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1. A rotating disc refiner segment for refining a lignocellulosic material with production of steam which is transported substantially radially along the segment, the segment comprising:
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a plurality of substantially radially extending bars and a plurality of substantially radially extending channels disposed intermediate said bars to form a pattern of bars and channels, each said channel having a channel width and a lower base surface at the bottom of said channel, each of said bars having a top surface and substantially radially extending first and second edges, the top surface of at least one of said bars having at least one radially extending groove formed therethrough intermediate said first and second edges, each of said grooves having a groove width and an intermediate base surface disposed at a height intermediate said top surfaces and said lower base surfaces, said groove width being less than said channel width at a corresponding relative height of said channel; whereby significantly more steam is transported substantially radially outwardly through the channels than through the grooves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A refiner having relatively rotating opposed discs which carry plates formed by a plurality of segments for refining lignocellulosic material wherein each segment comprises a pattern including a plurality of substantially radially extending bars and a plurality of substantially radially extending channels disposed intermediate said bars each of said channels having a width and defining a lower base surface at the bottom of each said channel, each of said bars having a top surface, at least one of said top surfaces having at least one substantially radially extending groove formed therein, each said groove having a width and defining adjacent blades on one of said bars and an intermediate base surface at the bottom of said groove disposed at a height intermediate said top surface and said lower base surface, wherein said intermediate base surface and said top surface define a height for said blade relative to said intermediate base surface and said lower base surface and said top surface define a height for said bar relative to said lower base surface, wherein said height of said bar is greater than said height of said blade and wherein said width of said channel is greater than said width of said groove at a corresponding relative height of said groove, whereby significantly more steam is transported substantially radially outwardly through the channels than through the grooves.
Specification