| Abstract:In order to study the effects of freeness of the pulp after first stage refining on energy consumption and pulp quality of selective refining, the pulp after first stage refining (freeness of 710 mL) was further refined to freeness of 600 mL, the effects of different freeness of pulps on selective refining were studied. The results showed that with the selective refining, starting from the pulp with freeness of 710 mL, compared with contrast pulp, the energy consumption reduced significantly, energy consumption of refining decreased by 13.1%, paper bulk and tear index increased by 11.6% and 1.7%, while the tensile index and internal bonding strength decreased by 10.5% and 16.8%, respectively; when selective refining starting from the pulp with freeness of 600 mL, energy consumption of refining decreased by 2.9%, paper bulk increased by 4.7%, while the tensile index and internal bonding strength decreased by 4.2% and 12.4% respectively, the higher freeness of the pulp after first stage refining was good for the reduction of energy consumption, compared with the freeness of 600 mL, the energy comsumption decreased by 10.6%, paper bulk and tear index increased by 6.7% and 1.9%, while the tensile index and internal bonding strength decreased by 6.6% and 4.9%. |
