Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With plural or specified mechanical defibering step
Reexamination Certificate
2007-11-27
2007-11-27
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With plural or specified mechanical defibering step
C162S023000, C162S056000, C162S068000
Reexamination Certificate
active
10485916
ABSTRACT:
A chip pretreatment process which comprises conveying the feed material through a compression screw device having an atmosphere of saturated steam at a pressure above about 5 psig, decompressing and discharging the compressed material from the screw device into a decompression region, feeding the decompressed material from the decompression region into a fiberizing device, such as a low intensity disc refiner, where at least about 30 percent of the fiber bundles and fibers are axially separated, without substantial fibrillation of the fibers. Preferably, the fibers are axially separated with less than about 5 percent fibrillation, and subsequently the fiberized material is refined in a high intensity disc refiner until at least about 90 percent of the fibers are fibrillated. In another form the invention combines chip fiberizing with chemical treatments, for improving the pulp property versus energy relationships.
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John R. Lavigne, Pulp & Paper Dictionary, 1986, Miller Freeman Publications, p. 353.
Papermaking Science and Technology, Book 5, Mechanical Pulping, dated 1999, pp. 397-398.
Alix Yale & Ristas, LLP
Andritz Inc.
Hug Eric
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