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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   winter 2019 , Volume 33 , Number 4 (65) ; Page(s) 467 To 477.

The effect of thermal aging on color change and optical properties of bleached chemi-mechanical pulp (CMP) bleached with one and two-stage sodium hypochlorite and hydrogen peroxide bleaching

Author(s):  ASADPOUR GH.*, RAJABI F., Zabizadeh s.m.
High yield and chemi-Mechanical pulps are susceptible to light-oxidation and thermal reactions. These reactions initiate discoloration and brightness reversion in pulps. In this research, chemi-mechanical pulps were selected randomly from Mazandaran pulp and paper mill and were bleached separately using P, H, PH and HP sequences and 60 gr/m2 sheets were prepared from these bleached pulps. All the prepared papers were separately exposed to thermal aging, at 0, 12, 24, 36 and 48 hours at 1050C in oven, and the optical properties, including, brightness, a, b and L factor, α exponent, yellowness, opacity, K/S ratio, and PC number before and after thermal aging were measured using relevant TAPPI standard test procedures and compared. The results study showed that, during thermal aging from 0 to 48 h, paper optical properties such as brightness, L and a factor were decreased and b factor, yellowness, α , K/S ratio and PC number were increased. As a result, bleaching by P and HP sequences had the highest brightness and L factor and lowest a & b factor, α exponent, yellowness, K/S ratio and PC number. Therefore, these bleaching sequences imparted important influences on brightness stability and decreased the paper brightness reversion and increased the durability against thermal degradation.
Keyword(s): Chemi-mechanical pulp,thermal aging,PC number,optical properties,sodium hypochlorite,hydrogen peroxide
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