EXAMINATION AND CORRECTION OF THE CENTRIFUGAL LIQUID REMOVAL METHOD TO EVALUATE THE INTERNAL STRUCTURE OF FABRICS

Abstract

The centrifugal liquid removal method provides an evaluation of the internal volume/radius distribution ranging from ca. 346 to 0.1μm in fabrics (by n-dodecane at 20°C). The removed volume of liquid under each centrifugal acceleration was found to deviate from real volume in the capillary at a critical radius due to the partial residue remained in large capillaries. On this account, experimental results of the centrifugal liquid removal method in large radius range on several types of fabrics and filters of glass coated ceramics were corrected with data obtained by the equilibrium liquid absorption method. Corrected cumulative hystograms of volume/radius distribution were found to afford a proper account relating to the geometric feature of the sample, and reasonably corresponded with the volume determined by the mercury intrusion method. Expression of internal volume per area of the fabric, V_pl, ml/cm² made it possible to compare the internal volume with the thickness of the fabric in terms of the identical dimension, [L]. V_t/T, ratio of total volume evaluated to the thickness of the fabric was slightly larger than porosity determined by the gravimetric method.