D - Textiles – Paper – 21 – B
Patent
D - Textiles, Paper
21
B
92/43, 92/55
D21B 1/04 (2006.01) D21B 1/12 (2006.01) D21D 1/30 (2006.01)
Patent
CA 1065663
METHOD AND APPARATUS FOR PRODUCING FIBER PULP FROM FIBROUS LIGNOCELLULOSE CONTAINING MATERIAL ABSTRACT OF THE DISCLOSURE Method and apparatus for producing thermo-mechanical pulp from wood chips and the like in which the chips are first heated in a steaming chamber or preheater to a fiber temperature below the softening point of the lignin of middle lamella section of the wood fibers. The thus heated chips are conveyed in a sealed system to the inlet of a defibrating zone enclosed within a housing in a gas- eous atmosphere of superatmospheric pressure, where it is compressed by a screw conveyor into a plug which seals the defibrator housing against blow-back of the pressurized gaseous medium. The defibrat- ing space is defined between a pair of grinding discs which rotate relatively to one another in the housing and comprises a first sub- stantially central, relatively low friction zone into which the com- pressed plug is advanced by the compressor screw and broken up into fiber bundles and the fibers subjected to an initial defibration step at a fiber temperature below the softening point of the lig- nin, to cause the fibers to unravel and to expose the different fiber layers without any substantial separation thereof. As the fiber bundles progress radially outwards under the centrifugal force of the rotating discs into a second relatively high friction zone radially surrounding the first zone, the temperature increases by the heat of the grinding friction which converts water accompany- ing the chips into high temperature, high pressure steam, in which environment the lignin is softened so that the wood structure is broken in the lignin-rich middle lamella section of the fibers to permit the fibers to become completely separated and fibrillated in undamaged condition. The resultant pulp is discharged from the pressurized housing through a blow valve which is adjustable to con- trol the pressure and temperature within the defibrator housing.
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Reinhall Rolf B.
Reinhall Rolf B.
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