WATER-SOLUBLE SUBSTANCES FROM BLEACHED PULP FIBERS

With this investigation, we have tried to clear up the reasons for dep osits' formation during disintegration of bleached beech magnefite pul p in high consistency pulper in one of our paper mills. It has been kn own for a long time that carbohydrates and lignin are the main compone nts of water soluble substances dissolved during mechanical treatment of pulp. By means of simulated laboratory beating trials in a Valley b eater and a Jokro mill with two different ECF bleached pulps, beech ma gnefite and hardwood kraft pulp, lye have compared the amounts of rele ased water soluble substances, determined by HPLC. It has been stated that at higher beating intensity, more water soluble substances with h igher carbohydrates to lignin ratio have been leached from bleached ma gnefite pulp, which may cause among others the conditions for deposits formation.