Method for decreasing energy consumption during refining of fiber material while maintaining capacity
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United States of America Patent
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Oct 6, 1992
Issued Date -
N/A
app pub date -
Jan 29, 1991
filing date -
Apr 10, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The energy consumption of a cellulosic fibrous material refiner is significantly reduced, while the capacity is maintained by reducing grinding frequency while increasing the retention time and power amplitude (edge bar load). The grinding frequency is maintained between about 200-2,000 Hz, preferably between about 300-900 Hz. The retention time is more than a second, being increased at least about 100 times compared to conventional disk refiners. The power amplitude is at least doubled. Retention time is increased by greatly increasing the retention volume by removing the majority (at least about 90%) of the steam at approximately the area that it is generated, minimizing the number of cutting elements, and disposing the grinding surfaces of the refiner so that they define a volume of revolution (e.g. a frusto-conical or cylindrical volume).
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