Recycling waste cellulosic material

Details Recycling waste cellulosic material Recycling waste cellulosic material

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) D21B 1/32 (2006.01) D21C 3/02 (2006.01)

Patent

CA 2104962

Waste cellulosic material, for example corrugated paperboard is cooked in an aqueous alkaline cooking liquor (26) to pro- duce a brownstock pulp having a kappa number tower than that of the waste material; combustion of organic materials (67) in the brownstock washing liquor provides heat energy which can be recovered (68) for use in the cooking process and residual inor- ganic chemicals of the liquor can be employed to prepare fresh cooking liquor (92); the recycled pulp (32) can be employed as the sole pulp component of brown paper products, or can be bleached (102) to provide a pulp for white paper products (104).

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