Investigation on Characteristics of Bleached Bagasse Pulp Using Neutral Sulfite and Soda Solutions

The aim of this paper was to evaluate the properties of three bleached pulps made of bagasse. Pulping was carried out with NaOH (15% o.d. bagasse) and Na2SO3:Na2CO3 with two different ratios (20:10% and 26.25:8.75% on oven-dried weight (o.d.) bagasse), with a time of 15 minutes time and a temperature of 170°C. Bleaching was done with sodium hypochlorite (8% o.d. pulp) at 120 minutes, 50°C temperature and 10% stock concentration at one stage. Some handsheets at 70 g/m2 basis weight were made. The characteristics such as, total yield, screen yield, shives content, kappa number, bulk, tear index, burst index, breaking length, brightness, and opacity were measured according to TAPPI and ISO standards and then compared to each other. The results indicated that bagasse soda pulp had the highest screen yield (57.77%), and the least yield (42.07%) was obtained with 30% neutral sulfite solution. The strength properties showed that pulp obtained with neutral sulfite solution had better tear index (2.23 mN.m2/g), whereas that from soda solution had better breaking length (1.3 km) and burst index (0.73 kpa.m2/g). The pulps cooked with neutral sulfite solution had better bleachability, whereas the bagasse soda pulp had better opacity.
واژگان کلیدی
Bagasse; Soda pulping; Neutral sulfite; Sodium hypochlorite bleaching; Mechanical testing; Optical testing

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