Energy efficient TMP refining of destructured chips

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Mechanical defibration in the presence of heated gas or gas...

Reexamination Certificate

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C162S018000, C162S028000, C162S056000, C162S068000, C241S028000, C241S261300, C241S296000

Reexamination Certificate



A system and method for thermomechanical refining of wood chips comprises preparing the chips for refining by exposing the chips to an environment of steam to soften the chips, compressively destructuring and dewatering the softened chips to a solids consistency above 55 percent, and diluting the destructured and dewatered chips to a consistency in the range of about 30 to 55 percent. The destructuring partially defibrates the material. This diluted material is fed to a rotating disc primary refiner wherein each of the opposed discs has an inner ring pattern of bars and grooves and an outer ring pattern of bars and grooves. The destructured and partially defibrated chips are substantially completely defibrated in the inner ring and the resulting fibers are fibrillated in the outer ring. The compressive destructuring, dewatering, and dilution can all be implemented in one integrated piece of equipment immediately upstream of the primary refiner, and the fiberizing and fibrillating are both achieved between only one set of relatively rotating discs in the primary refiner.

patent: 3098785 (1963-07-01), Meiler
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patent: 4012279 (1977-03-01), Selander et al.
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patent: 5683048 (1997-11-01), Virving
patent: 6276622 (2001-08-01), Obitz
patent: 6402071 (2002-06-01), Gingras
patent: 6607153 (2003-08-01), Gingras
patent: 2004/0118959 (2004-06-01), Virving
patent: WO 2004/009900 (2004-01-01), None
Brochure—“Turbine Segments”—Metzo Paper, date unknown.


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