Brief description of the recovery of the fibers of paper on the basis of materials containing the waste papers

摘要

Docket 6173 METHOD AND APPARATUS FOR RECOVERING PAPER FIBERS FROM WASTE PAPER CONTAINING MATERIALS 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. 1/4 inch, and a second fraction through substantially larger holes, e.g. 1 inch. 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.