Abstract
Bleachable grade pulps prepared from Nonvegian softwood spruce chips while simulating possible alternatives of improving pulp yield by application Of polysulphide (PS) and anthraquinone (AQ) have been used in this study. The tests for recyclability were performed on hydrogen form pulps. The pulps considered were Iso- Thermal cooking (ITC) kraft pulp which was used as a reference pulp, conventional PS-AQ pulp, soda PS-AQ pulp and kraft PS-AQ pulp. The loss Of swelling ability (homification) Of the pulps, was determined by measurement of water retention value (W R V). The results showed that, PS-AQ pulps had similar or slightly better swelling ability after the first cycle Of recycling than the reference kraft pulp. That means, hemicellulose retained in the PS-AQ pulps, as a result Of yield improvement by the addition of PS and AQ in the cooking liquors. does not appear to induce more hornification on the PS-AQ pulps. The physical properties Of handsheet papers made from the pulps, showed similar trend, i.e., either the loss Of paper strength of the PS-AQ pulps were similar or less compared to the kraft reference pulp. It was observed that, the loss of fibre swelling takes place more during the process Of drying in air than when fibres are exposed to heat after they have been dried
Recommended Citation
Minja, R. (2001). RECYCLABILITY OF MODIFIED PS-AQ PULPS AT AROUND KAPPA 30. Tanzania Journal of Engineering and Technology (TJET), 24(1), 66-78. https://doi.org/https://doi.org/10.52339/tjet.v24i1.306
Publisher Name
University of Dar es Salaam