Abstract
Viscosity of the following solutions/pastes were measured with “B” -Type Viscometer. Based on the resultant date, and from the relations between shearing rate and shearing stress, structural viscosity index of these materials were determined.(A) Water solution of Sodium Alginate(B) Water solution of Sodium Carboxymethylcellulose(C) Mixed paste of Calcium Carbonate and solutions (A) and (B)(D) Mixture (paste) of 80% Glycerin and Calcium CarbonateAmong these high-molecular electrolyte solutions, structural viscosity index of solution (B) is higher than that of solution (A), and that of paste (C) is much higher. Correct structural viscosity of paste material compounded with precipitate calcium carbonate could not be determined.Paste materials having formation similar to the toothpaste were test-manufactured, and their viscosity were measured with “B” -Type viscometer. Resultant viscosity curve shows clear relations among structural viscosity index, texture and flowing rate of the paste materials.A simple parallel-plate-type plastometer (spreadometer) was test-constructed, and viscosity of paste materials were measured with it. Relations between the time of loading and spreadarea of the materials tested well agree with those derived from the data obtained with “B” -Type viscometer. The fact shows this type of spreadometer can easily and well determine viscosity of test material of a limited amount.
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