D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
92/38
D21D 5/00 (2006.01) B03B 9/06 (2006.01) D21B 1/32 (2006.01) D21D 1/00 (2006.01)
Patent
CA 1191042
METHOD AND APPARATUS FOR RECOVERING PAPER-MAKING FIBER FROM CONTAMINATED WASTE PAPER PRODUCTS ABSTRACT OF THE DISCLOSURE In the recovery of paper-making fiber from contaminated waste paper products including plastics film and other lightweight non-paper contaminants, the waste paper products are processed together with liquid in a pulper tub and contaminants and liquid are discharged through a junk outlet in the tub and into a junk remover. In order to induce flow of light- weight contaminants into the junk remover, the latter has a weir adjacent its top and the level of the weir is controlled so as to maintain a liquid flow over the weir. The liquid and lightweight contaminants entering the junk remover as a result flow upwardly to the weir and are discharged over the weir for subsequent processing and recirculation of paper stock to the pulper tub. The materials flowing over the weir may be delivered to a rotary screening machine which defibers the waste paper and separates the fibers from the lightweight contaminants. A novel rotary screening machine is provided for this purpose comprising a perforated drum rotatable about a generally horizontal axis and having openings at opposite ends for the delivery of liquid and paper furnish to the drum and the discharge of contaminants, respectively, a plurality of vanes for lifting material from the bottom of the drum to an upper region, as the drum rotates, and a rotor mounted within the drum and having blades which are disposed in spaced relation to the drum vanes in a position to intercept material falling from the upper region of the drum and fling it back against the drum. The resulting fibers or flakes of useful paper are washed through the drum perforations whilst the rejected contaminants are conveyed to and removed via the discharge end of the drum.
409833
Black Clawson Company (the)
Gowling Lafleur Henderson Llp
LandOfFree
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