The Unidirectional Wettability Property of a New Warp-knitted Double-face Fabric
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Communication
The Unidirectional Wettability Property of a New Warp-knitted Double-face Fabric Tong Yang, Haifan Yu, Yuying Liu, Zhijia Dong, and Pibo Ma* Engineering Research Center of Knitting Technology, Ministry of Education, College of Textile Science and Engineering, Jiangnan University, Wuxi 214122, China (Received October 22, 2019; Revised November 28, 2019; Accepted December 2, 2019) Abstract: In order to knit a warp-knitted fabric with unidirectional wettability property, polyester multifilament and cotton yarn were used as raw materials, and samples were produced on an RD6 EL warp-knitting machine. The unidirectional wettability property of the fabric was tested by measuring the length of artificial sweat absorbed in the fabric. And the unidirectional wettability of the fabric primarily depends on the structure and twist of the yarn, especially the twist. The moisture absorption capacity of the yarn decreases with the yarn twist increasing. When the twist reaches a certain value, it will prevent the entry of moisture. This provides us with an inspiration for controlling the moisture absorption of fabric by the twist of the yarn when knitting the unidirectional wettability fabric. Keywords: Unidirectional wettability, Warp-knitted fabric, Twist, Polyester, Cotton
of liquid. There are three main principles of one-way transport of liquid bionics: differential capillary effect, wettability gradient effect and transpiration effect. The wettability gradient effect is the most commonly used principles in fabrics. When the wettability gradient occurs on a surface, the water in the hydrophobic area moves toward the hydrophilic area spontaneously and converges into water droplets. The wetting gradient of the fabric is usually produced in the thickness direction due to its hydrophilic/ hydrophobic double-sided structure. Shou Et al has found that changing the pore size of the porous system can change the degree of liquid passage to achieve one-way transfer of liquid [13]. However, due to the uncertainty of its manufacturing, this method is not widely used. The existing unidirectional wettability fabrics pro/ hydrophobic double-sided structure are mainly obtained by surface treatment and shaped fibers. There are two kinds of surface treatment methods; the pro-/hydrophobic finishing of the fabric surface and the treatment of the raw material by plasma to of modify the yarn [14,15], which makes fabrics become less comfortable. In addition, the unidirectional wettability ability will show a downward trend because of repeated use. Weft knitting is commonly used to weave shaped fibers and cotton yarns for knitting moisture-absorbing, quick-drying fabrics. However, the cost of shaped fibers is high comparing with ordinary raw materials. Due to the limitation of raw materials, the value of using cotton fiber as raw material for weaving unidirectional wettability warp-knitted fabrics still is not explored. Compared with the weft knitting method, the warp-
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