Method of determining the internal porosity of powders

Details Method of determining the internal porosity of powders Method of determining the internal porosity of powders

1987-09-03

1988-08-30

Levy, Stewart J.

Measuring and testing

With fluid pressure

Porosity or permeability

73866, G01N 1508

Patent

active

047667613

ABSTRACT:
A method for determining the approximate value of the internal porosity of a powder is set forth wherein a quick determination is achieved by measuring the maximum drawing force of an object such as a plate being withdrawn from within a bed of the powder, and repeating the removal of the object at least one additional time from a more compacted powder bed and utilizing the values obtained to solve simultaneous equations. The process is particularly suitable with regard to determining the internal porosity of polyvinyl chloride powders.

REFERENCES:
patent: 4181023 (1980-01-01), Clamroth et al.
"The Forces on Obstacles Suspended in Flowing Granular Materials", by T. D. Atkinson, J. C. Butcher, M. J. Izard, & R. M. Nedderman.
"The Theoretical Prediction of Stress Distributions in Hoppers", by R. M. Nedderman.
"The Effect of Vibration on the Rheology of Powders", by B. H. Kaye, J. E. Leblane, D. Moxam, and D. Zubac.

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