In order to investigate systematically the effect of sodium alginate and C. M. C. as the paper making mucilage the degree of deflocculation of the fiber suspension was measured statically by means of “the time of the flocculation method, ” at the constant pulp consistency of 0.1% and in varying concentration of these additives having various degrees of polymerization and etherification.
The results obtained are as follows.
(1) When additives are used in the same concentration range those giving higher viscosity to the solution are found to have more great deflocculating effect on fiber suspension.
(2) When additives of the same degree of etherification, but different in their degree of polymerization, are used in the same viscosity range those of the higher degree of polymerization are found to be more effective in deflocculating the fiber suspension.
(3) When additives of the same degree of polymerization, but different in their degree of etherification, are used in the same viscosity range those of the lower degree of etherification are found to be more effective.
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