High intensity refiner plate with inner fiberizing zone
First Claim
1. In a primary wood chip refiner having flat, relatively rotating discs, each having a working plate thereon, the working plates being arranged in confronting coaxial relation thereby defining a refiner gap which extends substantially radially outward from the inner diameter of the discs to the outer diameter of the discs and defines a flow area for the chip material to be refined, the improvement comprising:
- each plate having a radially inner fiberizing band and a radially outer fibrillating band, each band having an inner feeding region and an outer working region, wherein the working region of the inner band is defined by a first pattern of alternating bars and grooves, and the feeding region of the outer band is defined by a second pattern of alternating bars and grooves, and said flow area increases immediately after the inner working region into the outer feeding region;
the refiner gap includes an outer gap defined between the confronting outer bands and an inner gap defined between the confronting inner bands;
the refiner is a thermomechanical refiner that generates steam in the outer gap between the working regions of the outer bands;
at least one of the confronting plates includes a steam bypass channel for directing some of said steam from the outer gap to the inner gap at the inner feeding region while bypassing the inner gap at the inner working region; and
the steam bypass channel is formed as a groove on the surface of the working region of the inner band, oriented diagonally through the bars and grooves of said pattern of bars and grooves.
2 Assignments
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Accused Products
Abstract
Plate elements, a plate configuration, and associated system for thermomechanical refining of wood chips wherein destructured and partially defibrated chips are fed to a rotating disc primary refiner, where opposed discs each have an inner band pattern of bars and grooves and outer band pattern of bars and grooves, such that substantially complete fiberization (defibration) of the chips is achieved in the inner band and the resulting fibers are fibrillated in the outer band. A pair of opposed co-operating refining plate elements for a flat disc refiner wherein the bars and grooves on each of the inner bands form an inner feed region followed by an outer working region, the bars and groove on each of the outer bands form an inner feed region followed by an outer working region, and the gap and/or material flow area formed when the plates are placed in front of each other increases between the inner working region and the outer feed region. A steam bypass channel is formed as a groove on the surface of the working region of the inner band.
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Citations
19 Claims
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1. In a primary wood chip refiner having flat, relatively rotating discs, each having a working plate thereon, the working plates being arranged in confronting coaxial relation thereby defining a refiner gap which extends substantially radially outward from the inner diameter of the discs to the outer diameter of the discs and defines a flow area for the chip material to be refined, the improvement comprising:
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each plate having a radially inner fiberizing band and a radially outer fibrillating band, each band having an inner feeding region and an outer working region, wherein the working region of the inner band is defined by a first pattern of alternating bars and grooves, and the feeding region of the outer band is defined by a second pattern of alternating bars and grooves, and said flow area increases immediately after the inner working region into the outer feeding region; the refiner gap includes an outer gap defined between the confronting outer bands and an inner gap defined between the confronting inner bands; the refiner is a thermomechanical refiner that generates steam in the outer gap between the working regions of the outer bands; at least one of the confronting plates includes a steam bypass channel for directing some of said steam from the outer gap to the inner gap at the inner feeding region while bypassing the inner gap at the inner working region; and the steam bypass channel is formed as a groove on the surface of the working region of the inner band, oriented diagonally through the bars and grooves of said pattern of bars and grooves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification