The finite length of natural fibers makes them frail and unable to perform and be engineered as excellent composite reinforcements. Hence, roving formations and weaving techniques have been employed to overcome these weaknesses and have been used as an alternative reinforcement in continuous quasi-unidirectional hemp composites (QUDHCs). Tensile, flexural, and water absorption tests were conducted on nine QUDHCs. It was concluded that adopting the warp consolidation weaving technique significantly improved the mechanical stability of the QUDHCs and negatively affected the water absorption properties. Nevertheless, adverse effects of a roving twist on the mechanical properties of QUDHCs were found when a 40 turn/m roving was used as the weft. Meanwhile, the mechanical properties of QUDHCs were strongly dependent on the fiber quality produced after roving twists. The roving twists numbers affected the water absorption of QUDHCs in different ways when there is/no warp yarn interweaving with the roving in the preform. In contrast, the moisture rate gain increased with the increment of roving twists in the case of the warp yarn and weft roving interweaving in the preform. The results in this study highlight the feasibility of improving the mechanical and water absorption properties by hemp roving fiber formations and weaving techniques, which is beneficial for the textile-structure composite industry.
Ramie composites have been widely used in automobiles, daily necessities, aerospace, ships, cruise lines, etc., but their flame retardant properties are relatively poor, which is difficult to meet the flame retardant performance requirements of composites for rail transit. In order to improve the properties of ramie reinforced composites, flame retardant treatment is necessary. In this paper, phosphorus flame retardant phytic acid (PA) was used to modify ramie fabric, and then the composites were prepared. The flame retardancy and mechanical properties of ramie reinforced composites were investigated. It was found that the flame retardancy of ramie composites was improved after flame retardant modification with phytic acid, but the mechanical properties were decreased. In order to improve the mechanical properties of PA ramie composites, two kinds of layered PA ramie/glass fiber hybrid composites were prepared by replacing part of ramie with glass fiber. The results show that the addition of glass fiber can improve the mechanical properties and flame retardancy of composites.
Enhancing the thermal-wet comfort of garments is a key factor in sportswear research. In this study, we designed a new three-dimensional moisture conduction structure model, developed double-sided fabrics of a changed spacer weft-knitted structure, and compared them with single-sided plain stitch and cellular structure fabrics, focusing on the morphology, basic structural parameters and absorption, and quick-drying performance. The findings indicated that the changed spacer weft-knitted fabric consisting of 18 tex Tencel and 33.3 tex (96 f) recycled polyester filament has a smaller surface density and thickness, the water absorption of 436%, the water evaporation rate of 0.354 g/h, and the water vapor transmission of 7476.75 g/(m2 · d). Compared with other fabrics, it has excellent absorption and quick-drying performance. Partitioned T-shirts were designed by using the human body sweating law, and four fabrics were applied to one to four areas according to the sweating degree. Through infrared image monitoring and subjective evaluation, we concluded that the partitioned T-shirt has efficient absorption and quick-drying ability, and has potential to be applied to the development of thermal-wet comfort sportswear.
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