Abstract
Laboratory studies for direct causticizing process by ferric oxide in unbleached pulp viscosity and weight average fiber length of soda quinone pulp were carried out in comparison with kraft pulp. DDA (1, 4-dihydro-9, 10-dihydroxy anthracene sodium salt) was used as quinone, and Kajaani FS-100 was used to measure fiber length distribution and average fiber length. Unbleached pulp viscosity of soda quinone pulp of Douglas fir (pin chips) decreased to half with 10°C rise of cooking temperature, to 2/3 with two times longer cooking time, and to half with 50% increase of active alkali charge. Nevertheless, there was no change on unbleached pulp viscosity with increase of quinone addition. Unbleached pulp viscosity increased straight with increase of sulfidity of KP. 0.1% quinone addition of soda quinone pulp was equal to 12.2% sulfidity of KP on the view point of unbleached pulp viscosity.2% quinone addition soda quinone pulp and 25% sulfidity of KP had longer fiber distribution than soda pulp and 0.1%soda quinone pulp. Unbleached pulp viscosity of Douglas fir increased slightly with increase of weight average fibe length, and tear factor of unbleached pulp at CSF 500ml increased with weight average fiber length.
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