Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1979-03-20
1981-06-09
Fisher, Richard V.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 28, 241 21, 241 24, 241 28, 241 29, 241 69, 241 78, 241 792, 241 80, D21B 132, D21B 134
Patent
active
042723159
ABSTRACT:
Waste paper containing materials, e.g. commercial "waste paper", are treated for recovery of reusable paper therefrom by slushing in a pulper from which two fractions are continuously extracted--a first fraction through small holes, e.g. 3/16 inch in diameter, and a second fraction through substantially larger holes, e.g. 1 inch in diameter. The second fraction is screened, preferably after a centrifugal cleaning operation, in a screen having small perforations sized to accept only substantially defibered paper, and the accepts flow is mixed directly with the first extracted fraction. The reject flow from this screen is conducted, with or without an intermediate deflaking operation, to a tailing screen from which the accepts are recycled to the pulper and the rejects are eliminated from the system. Major advantages of this method and system include the continuous elimination of plastic and other floating trash from the pulper, a high degree of essentially complete defibering in the pulper, and minimal recycling of adequately defibered stock.
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Fisher Richard V.
The Black Clawson Company
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