The Study on Refining of Masson’s Pine Kraft Pulps for Sack Paper

High consistency refining (HCR) and low consistency refining (LCR) of unbleached Masson’s pine kraft pulps for sack paper were studied in this article. The properties of their refined pulp and handsheet were analyzed comparatively. The results showed a high consistency refining was more suitable for sack paper with unbleached Masson’s pine kraft pulp than a low consistency refining. High consistency refining is of advantage to retain the fiber length. The tear index of the handsheet of high consistency refining were higher than that of low consistency refining. The TtensileT TenergyT Tabsorption (TEA)T index and air permeability of the handsheet of high consistency refining which were crucial properties of sack papers were better, though higher tensile index could be obtained with low consistency refining.