Effect of Lactase Enzyme on Delignification and PhysicalProperties of OCC Pulp

Iranian Journal of Wood and Paper Industries

卷:3

Saeid Mousavi¹  Omid Ramezani²  Hossein Kermanian³  Masoumeh Moradi⁴ 

[1] استادیار، بخش تحقیقات علوم چوب و فرآورده‌های آن، موسسه تحقیقات جنگل‌ها و مراتع کشور;

[2] استادیار، گروه مهندسی فن‌آوری تولید سلولز و کاغذ، دانشگاه شهید بهشتی، پردیس زیرآب;

[3] استادیار، گروه مهندسی فن‌آوری تولید سلولز و کاغذ، دانشگاه شهید بهشتی، پردیس زیراب;

[4] کارشناسی‌ارشد، گروه مهندسی فن‌آوری تولید سلولز و کاغذ، دانشگاه شهید بهشتی، پردیس زیراب;

关键词: Lactase enzyme;    Old Corrugated Container (OCC);    SR degree;    kappa number;    Water retention value (WRV);    Apparent density;   

DOI  :  

来源: DOAJ

【 摘 要 】

Old Corrugated Container (OCC) recycled pulp provided by a local paper manufacturing company was treated by lactase enzyme. The pulp was sampled from headbox and treated by enzyme in the conditions of consistency 2%, pH 5, reaction time 2 hours, and reaction temperature 60 °C in dosing levels of 0.005, 0.01 and 0.015 % based on oven-dried weight of pulp. Fiber classification of the control pulp showed 31.3 % of fines content and 0.82 mm average fiber length. Results have indicated that lactase treatment decreased kappa number and SR degree to 20% and 14 degrees, respectively which consequently facilitated the drainage of pulp. The extraction of treated samples showed a peak at around 280 nm, confirming the delignification of pulp by enzyme. Microscopic observation of fiber walls of the treated sample indicated a local separation of middle lamella, fiber linting and removal of fines from fiber surface. The highest Water Retention Value (WRV) was measured to be at 0.015% enzyme addition level. The apparent density of handsheets made from treated samples was lower compared with the handsheets made of control pulp resulting in loss of paper strengths.

【 授权许可】

Unknown