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Extra resources for Advances in Recycling and Deinking
Having a second washer in loop II gives a system ash removal that is higher than for the standard process described above. For optimum brightness, it is best to use two-stage bleaching (oxidative and reductive). If the furnish also contains mechanical fibres, two flotation stages should be provided. $TDSFFO $PBSTFDMFBOFS )$QVMQFS QSFDMFBO 3FKFDU IBOEMJOH 'MPUBUJPO -001** -001* %"' &GGMVFOU Source: Reproduced from Schwarz (2000) with permission from Fapet Oy, Finland Tissues are very low basis weight papers, generally 15–25gsm for toilet and facial tissues.
Two-stage dispersion occurs in the second and third loops that are separated from each other by a thickening stage to 30%. Only this repeated sequence of dispersing and flotation fulfils the high cleanliness requirement at the end of the system. $TDSFFO $PBSTFDMFBOFS )$QVMQFS
QSFDMFBO -001* %"' %"' %"' 3FKFDU IBOEMJOH 4MVEHF USFBUNFOU %"' &GGMVFOU Source: Reproduced from Schwarz (2000) with permission from Fapet Oy, Finland An additional advantage of the three-loop system for recycled fibre processing is that it allows a reductive/oxidative bleaching sequence (dithionite/peroxide).
DIP brightness is higher than BCTMP brightness and it competes with the brightness of hardwood kraft pulps; it had the lowest dissolved and colloidal materials (DCM) content of any of the pulps tested. Stora Enso’s Sachsen mill at Eilenberg, Germany, has produced 70,000tpy flash-dried market DIP from old magazines and newspapers since 1994 (Pfitzner, 2003). A modern two-loop deinking plant recycles the recovered paper using equipment from Voith, Andritz-Ahlstrom and Kadant Lamort. Recovered paper is pulped in a drum pulper then the pulp is screened and passed to high-consistency cleaners.
Advances in Recycling and Deinking by Pira International Ltd