Abstract
The Severs rheometer has been slightly modified to provide greater flexibility of use. Besides its normal use as a rheometer, it may be used to accept samples in collapsible tubes. Such samples undergo no change in thixotropic set before actual measurement. The apparatus can also be used to shear samples of up to 700-ml. volume in a manner comparable to a high-speed filler. The method of calibrating the filler shears is outlined. Commercial fillers show shears from slightly in excess of 10,000 seconds −1 to 100,000 seconds −1 . It is demonstrated that the combination of nozzle, piston, and filler geometry is such that each can become the point of critical shear, depending on the relative dimensions of the other parts.
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