Method for processing papermaking fiber suspension obtained from waste paper, involves admitting portion of suspended solids contained in filtrate at point of papermaking fiber suspension

摘要

The method involves admitting a portion of suspended solids contained in a filtrate (F3) at a point (11) of a papermaking fiber suspension (S,S'). The point lies downstream of a laundry (3), from which filtrate originates. The filtrate includes a solid content of certain amount, and is concentrated before re-addition to develop a material concentrate (13) and a clear filtrate (14).