نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری صنایع خمیر و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، دانشکدۀ مهندسی چوب و کاغذ، گروه صنایع خمیر و کاغذ، گرگان، ایران.
2 استاد، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، دانشکدۀ مهندسی چوب و کاغذ، گروه صنایع خمیر و کاغذ، گرگان، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
This research was done to evaluate of cellulase potential to improve the physical properties and drainability of OCC pulp. The OCC pulp with 10% consistency was treated enzymatically under constant conditions of temperature 50°C for 60 min and pH range of 5-5.5 by different levels of 0.05, 0.1, 0.2, 0.3 and 0.5% from cellulase (based on oven dry weight of waste paper). Also OCC pulps were separately pre-treated at different times of 30, 90, 120 and 150 min at given cellulase charge (0.3%). In addition, enzyme pre-treated OCC pulps were refined mechanically at constant revolution of 2000 rpm. The results showed that without employing refining, enzymatic pre-treatment caused to improve the pulp freeness by about 22% proportional to control sample (non enzyme treated pulp with 470 ml, CSF). Using 0.3% and 0.5% were resulted as same as the highest freeness (600 ml, CSF). With increase in cellulase charge from 0.05 to 0.3%, the paper with lower calliper and higher density was resulted. Also, in unrefined OCC pulp, use of shorter duration of enzymatic treatment (30-60 min) was resulted in a pulp with higher density and air resistance. Maximum freeness (645 ml, CSF) was attained at 90 min. Increasing the enzyme level followed by refining caused to improve pulp freeness and a range of 0.05-0.1% cellulase is advisable as the best level of enzyme usage.
کلیدواژه‌ها [English]
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