تاثيرميزان پالايش بر مشخصات الياف و درجه رواني خمير كاغذ كرافت چوب كاج بروسي

Effect of beating value on Brutian Pine (Pinus brutia) kraft Pulp Fiber Characteristics and Freeness

This research was aimed to evaluate effect of beating value on kraft pulp fiber characteristics and pulp freeness, made from 12 year Brutian Pine. Cooking factors in pulping stage were as: sulfidity 25%, cooking temperature 165 °c, active alkalitv 20% and cooking time 90 min. PFl mill with different revolution as 6000, 8000, 10000, 12000 and 14000 was used for pulp refining. Analysis of variance of fibers and pulp freeness was conducted using completely randomized design, then mean values were compared, using Duncanʹs test. Results showed that between Fiber length and diameter, lumen diameter, fiber wall thickness and pulp freeness, before and after refining, were significantly different at the level of 1%. Increasing refiner revolution to 12000 caused significantly lower value for fiber characteristics and pulp freeness; but by increasing refiner revolution to 14000, was found no significantly different at the level of 1%. Optimizing refiner revolution was suggested 12000, with fiber characteristics and pulp freeness 488 CSF.