TCF Short-Sequence Bleaching of Pinus Kesiya Pulp Made by Low-Temperature Kraft Pulping

In this paper, the TCF short-sequence bleaching (OQPaP) of pinus kesiya pulp from low-temperature kraft pulping with kappa number of 21.32 and viscosity of 1194mL•g-1 (the maximum pulping temperature was only 150°C) was optimized. Under the optimum bleaching condition, the bleached pulp properties of low-temperature kraft pulp were as follows: yield 93.1%, brightness 85.31% ISO, kappa number 1.02, viscosity 751mL•g-1 and PC number 0.28. And physical properties of handsheet (after beating to 45oSR) were as follows: breaking length 5.41km, bursting index 3.48kPa•m2•g-1, tearing index 8.4mN•m2•g-1, and folding endurance 146 times.