THE MEASUREMENTS OF PORE-SIZE DISTRIBUTION IN THE ASSEMBLY OF FIBRES

Abstract

The mercury-intrusion method for the study of pore-size distribution of porous materials was applied to assembly of fibres as such as woven fabrics and card slivers. In this paper, these determinations were made on various fabrics, compressed slivers and twisted slivers, at low pressure from 10-4mmHg to 2 atomospheric pressure in glass dilatometric apparatus. And the following results were obtained:1. The three woven fabrics were selected for study of pore-size distribution. These fabrics were woven from 30/2′S cotton yarns with same number of twist per inch. One of them was woven plain weave with loose thread counts, and another two fabrics were woven twill weave closely (Table I). On the relation between pore-size distribution and thread counts in fabrics, a shift of the distribution curve peak to smaller pores was observed as the thread count was increased. (see Fig. 4)2. The compressed card slivers were selected for the study of dependency of bulk density on the pore-size dististion. These slivers were composed of 2 d. viscose rayon filaments and their linear density was 0.04 grams per cm. The pore-size distribution curves obtained for five sliers with various compression ratio, as shown in Table II, indicate that a shift of the distribution curve peak to smaller pores was observed as the compression ratio was increased (see Fig. 6).3. The determination of pore-size distribution curve was selected for five slivers in various twist number per cm. On the relation between pore-size distribution and twist number per cm in sliver, the pore-size distribution curve indicated that a shift of the distribution-curve peak to smaller pores was observed as the twist number was increased (see Fig. 9).