Comparison of Air Permeability Measurements Among Commonly Used TAPPI Methods, 1992 Process & Product Quality Conference Proceedings

This report analyzes the results obtained from the mercury-column Gurley instrument, and the "Sheffield Porosity" instrument. Paper specimens are also tested on an instrument that can regulate air pressure at various intensities, and air flow is measured with flowmeters calibrated to NIST-traceable methods. The air flow through many of the specimens is laminar within the range of pressures tested, whereby the Poiseulle-Hagen formulas are highly accurate in predicting the test value obtained using the conventional methods.

Author: Hagerty, G.A., Walkinshaw, J.
Comparison of Air Permeability Measurements Among Commonly U
Comparison of Air Permeability Measurements Among Commonly Used TAPPI Methods, 1992 Process & Product Quality Conference Proceedings
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