To follow the previous report, the various effects of surface-active additives upon the viscose processing performance of the sulphate dissolving pulp were observed.
Some kinds of non-ionic and anionic surfactants have given definite improvements to the viscose processability of sulphate dissolving pulp, the extents varying according to analytical qualities and chemical reactivities of the pulps used.
The functions of nonionic surface additives are related with the chain-length of their hydrophile radicals, and the most favorable range of chain-length of ethylen oxide for the surface active additive was observed to come between 30 and 50 mols in case of the nonionic surfactants used in this experiments.
In order to ascertain how surfactants function in viscose processes, a nonionic surfactant was applied in various stages of viscose preparation. The best results were obtained when the surfactant was added at the shredding of alkali cellulose. It is presumed that the improving effects of surfactants for filterability of viscose is mainly attributed to their function as a aid for xanthation reaction and dissolving of xanthate.
The floating tendency once incited in the steeping liquor of the pulp sheets when treated by surfactants has been practically lost after the seven months' storage of the pulp sheets.
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