Abstract
In earlier parts of the series, we investigated the influence of the woven and weft knitted fabric structures on their frictional characteristics, and then defined new indices as the fabric—structural—asperity index (FSAI). In this paper, we have developed this index for warp-knitted fabric structures, to explain the frictional behavior of fabrics. For this purpose, four different structures of warp knitted fabrics were produced, such as Queen's Cord, Tricot, Locknit, and Satin that have 0, 1, 2, and 3 underlaps in their front guide bar, respectively. Two of these structures, i.e., Tricot and Locknit, were also knitted in two different densities. Next, the frictional forces measurement was carried out on the fabricsinfivedifferentdirections, suchaswale-over-wale, course-over-course, underlap-over-underlap, underlap-against-underlap, and perpendicular direction to underlap-over-underlap. The experimental results showed that the indices of warp knitted fabrics (FSAI) have a good relation with frictional resistance parameters in all directions of motion. Any increase in the fabric density also revealed a decrease in FSAI values and increase in F s—F k parameter and hence a decrease in the resistance to sliding.
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