بررسي ويژگيهاي خمير كاغذ توليد شده به روش سودا-آنتراكينون از ساقه كلزا

Investigation on Soda-Anthraquinone Pulping of Rapeseed Straw

This researeh is aimed to study the possibility of rapeseed straw (Hayo/la401) pulping and its paper eharaeteristics, using Soda-AQ proeess. The average fiber length was found 1.04 millimeter and the average fiber diameter, lumen and thickness were found 28.00, 19.09, and 4.91 micrometer, respectively. Cellulose, lignin, extractive material (acetone solved) and ash were measured 41.66, 16.00, 1.63,and 3.46 percent, respectively. Cooking condition was determined as follow: Soda as 16, 18, and 20 pereent on the basis of rapeseed dry straw, temperature was set at 175 and 185 Co, cooking time was set at 40 and 70 minutes, and straw to liquid ratio was set at 1/8. The amount of anthraquinone added to cooking liquor was 0.2%, based on rapeseed dry straw. Using severe eooking factors eaused reduction of yield and Kappa number in both methods. Refining was performed on selected pulps in order to reach 350± 25 (ml,CSF) freeness. The 60 gr/m" hand sheets were made in order to determine meehanical strength and physieal properties. Average thickness, density and bulk is measured at 86.4 u, 0.69 gr/crnʹ and l.44cmJ/gr respectively. Average tear index, burst index, breaking length and tensile index are measured at 4.6 mN.m2/gr, 3.5 kpa.mvgr, 7.4 krn and 72.6 Nmlg respectively. The results showed that however screen yield of rapeseed straw pulp is low but kappa number and mechanical properties of pulp is suitable, compared with the other agriculture residues, so Rapeseed pulp can be used in paper making industries.