Bamboo charcoal/phase change material/stainless steel ring-spun complex yarn and its far-infrared/anion-releasing elastic warp-knitted fabric: Fabrication and functional evaluation

Abstract

In this study, far-infrared/anion-releasing elastic warp-knitted fabrics were successfully fabricated. Firstly, the composition and twist degree of ring-spun complex yarns that were made by rotor-twisting machine and ring-spinning frame were optimized based on twist contraction, hairiness, and tenacity measurements. The shell materials-1-ply bamboo charcoal (BC) roving, 1-ply phase change material (PCM) or the both (BC/PCM), and the core material-BC/stainless steel (BC/SS) wrap yarn, were formed into different compositions of ring-spun complex yarns. Afterward, elastic warp-knitted fabrics were fabricated using the optimized complex yarns as weft yarns, and rubber threads and polyester (PET) filaments as warp yarns. Air permeability, Downloaded from far-infrared emissivity, and anion amount of resulting warp-knitted fabrics were evaluated. Ring-spun complex yarn result shows that, twist contraction rate ratio increased, but hairiness decreased with increase of twist degree. Tenacity of ring-spun complex yarn made by BC roving (Type A) or PCM roving (Type B) first increased and then decreased with twist degree. However, when 1-ply BC and 1-ply PCM rovings were used as shell materials, the tenacity of resulting ring-spun complex yarn (Type C) decreased with twist degrees. Consequently, 12 twists per inch (T.P.I.) was the optimal twist degree for the following fabrication of warp-knitted fabrics. Air permeability, far-infrared emissivity, and anion amount of elastic warp-knitted fabrics composed of BC/SS wrap yarn and BC roving reached 44.35 cm 3 /s/cm 2 , 0.94e and 420 counts/cm 3 , respectively, indicating excellent breathability and far-infrared/anion-releasing health care functions.

Yarns Emitting Far Infrared Rays

“…Fibers with different polymers were obtained from extruder by adding them into polymer matrix. The studies showed that bamboo charcoal powders increased the FIR emissivity rate [8], [12], [14].…”

“…Bamboo charcoal powder is another material that attribute FIR feature to the textile products. Bamboo is generally grown up in low-latitude tropical and subtropical regions [12]. Bamboo charcoal powders are obtained by carbonizing the bamboo plant in ovens at 800-1200 °C and the harvest of the plant should be made after five years [26].…”

Manufacturing techniques and property evaluations of conductive elastic knits

“…Knits are a suitable material for wearable electronic textiles as they have high softness, air permeability and extensibility, and can significantly improve the comfort of wearers. A crochet machine is a warp knitting machine with special specifications, providing knits with different functions using the combinations of yarn and knit structure [15,16]. The warp knitted fabrics that are composed of rubber threads have excellent elasticity [17][18][19][20].…”

Functional Elastic Knits Made of Bamboo Charcoal and Quick-Dry Yarns: Manufacturing Techniques and Property Evaluations

“…The other method for producing multi-functional yarns is using a wrapping or twisting process to combine different functional yarns [19][20][21][22][23]. The process has a low production cost and is easily manufactured, thereby making mass production feasible.…”