Abstract: A base warp-knitted fabric of NEDDPET/EHDPET sea-island composite fiber is processed with alkali de-weighting after or before impregnation in polyurethane to obtain the impregnated NEDDPET microfiber fabric. This paper is to study the micro structure and its related performance in the processing

of the warp-knitted fabric. The results show that the warp-knitted fabric impregnated before the alkali deweighting treatment formed an elastic PU adhesive film in the cross-sectional area of the microfiber bundle,giving the impregnated microfiber fabric low-modulus, highly-elastic, fluffy, soft, and breathable comfort

features; while the surface of the warp-knitted microfiber fabric was densely covered by a PU film if the fiber was split before impregnation. The resulted product is stiff, air-tight, with lower stretchability and poor wearing performance.

Key words: warp-knitted fabric; impregnation; microfiber; structure; properties