Water loop and bleaching process design to recycle recovered paper into printing and writing grades

The production of high grade printing and writing papers from low grade or mixed office waste (MOW) requires an elaborate recycling process system. Hi gh brightness, excellent pulp cleanliness and extreme low stickies counts h ave to be achieved matching virgin hardwood pulp dualities. These pulp spec ifications require a recycling process in which each process module must be individually line-tuned and its performance depends heavily on the perform ance of other process modules. Special attention must be given to water man agement and bleaching as two key pro cess steps within the recycling proces s, The following paper will describe process parameters and technological d ata from a European fibre recycling system that is producing 300 tpd high g rade recycled pulp from MOW.