Abstract
Measurement of the attenuation of acoustic waves is suggested as a method for deducing the consistency of thin suspensions of papermaking fibres. Results obtained by a pulse method in the frequency range 1 to 6 MHz show that attenuation increases linearly with consistency. The measurements are in the range 0 to 2.5 wt. %, a range wh ich is not adequately covered by other methods of consistency measurement. The specific attenuation varies between samples. Values of the order of 20 dB/wt.% metre at 1 MHz are reported, increasing roughly as the square of frequency. The effects of temperature, wetness, additives, and entrained air are discussed.
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