Study of moisture-regulating properties of double-layer knitted structures for functional clothing

The moisture - regulating properties of knitted fabrics are important factors that determine not only comfort, but also the characteristics of functional clothing. Double - layer knitted fabrics are used because of their unique transport properties such as vapor permeability, breathability, moisture transfer properties. Double - layer knitted structures of a combined weave based on an eraser were developed on a double - loop circular knitting machine using functional threads in one of the layers: with a moisture management function, a microfilament polyester thread (Quick Dry with a linear density of 18.7 tex (f144), a microfilament Soft thread of 16.7 tex (f288)). The vapor permeability and vapor capacity of canvases were studied by the gravimetric method. The kinetic curves of water vapor absorption showed that at the initial stage of research, fabrics with a microfilament thread had a high rate of vapor absorption in a short period of time. Theoretical and experimental dependences of the vapor permeability of fabrics on the time of contact with a source of moisture vapor have been determined. To assess the ability of a two - layer knitted material to conduct moisture through itself, studies were carried out on the evaporation rate of a drop of moisture liquid from the surface of knitted fabrics. It has been determined that the microporous structure of the functional thread layer creates an open evaporation surface area, which reduces the evaporation time; on the curves of the drying rate of knitwear using a Quick Dry thread, the presence of a second critical point is noted, indicating the evaporation of adsorption - bound moisture from the side capillaries of elementary filaments, which slows down the evaporation process. The produced fabrics can be recommended for use as materials for the first and second layers of clothing.