بررسي استفاده از گوني هاي كنفي فرسوده در ساخت خمير كاغذ

Investigation on Utilization of Old Jute Bags for Pulping

Soda pulping of old jute bags was studied. Moreover, Fiber length and diameter, lumen diameter and cellwall thickness were measured. Average yield and Kappa number of soda pulps were found to be 55.4% and 34.7, respectively. Different pulping conditions were compared and optimum pulping conditions were selected at 14,16, 18% alkali and 20 min cooking time. Then, 60 g/m^2 hand sheets were made . Burst index of hand sheet was measured at 4.73, 5.78 and 4.78 kPa.m2/g for 14,16 and 18% alkali charge, respectively. Tear index was measured at 10.98, 10.83 and 11.65 mNm2/g for 14,16 and 18% alkali charge, respectively. Breaking length was measured at 4.4185, 4.6390 and 4.3900 km for 14, 16 and 18% alkali charge, respectively. Folding endurance was also measured. Statistical analysis indicated that alkali charge did not affect breaking length significantly. However, it influenced tear index, burst index, and folding endurance significantly.