| Negative warmth is mainly achieved by increasing the thickness of the fabric and adding warm materials,which reduces the comfort and aesthetics of the garment and does not meet the needs of people for functionality and comfort.Moisture-absorbing heating materials make good use of the moisture emitted by the body and convert it into heat to keep body warm.EKS fibre is an acrylic-based moisture-absorbing and heatemitting fibre with good moisture-absorbing and heat-emitting properties.The aim of this paper is to study the properties of EKS fibre in depth.The aim of this paper is to study the properties of EKS fibre in depth,and to develop warm knitted fabrics with excellent thermal insulation and other performance through yarn design and knitted fabric structure design.Firstly,research into the structure and properties of fibres.The structural and mechanical properties of EKS fibre,Sunburner fibre and acrylic fibre were tested and compared,and the heat and moisture properties of these fibres were compared with those of cotton and viscose fibres.The results show that EKS fibres have a sub-circular cross-section with grooves on the surface and that they contain a large number of hydrophilic groups and have a lower crystallinity,tensile strength and coefficient of friction than conventional acrylic fibres.Sunburner fibres,on the other hand,have a smooth longitudinal surface,less crystallinity and lower strength.EKS fibre has a moisture return rate of 23.31% and absorbs 61% more heat than viscose fibre,its heat and moisture performance is second only to Sunburner fibre and much higher than the above-mentioned fibres,followed by EKS fibre and Sunburner fibre which have better anti-static properties and are suitable for developing winter fabrics.10 three-component yarns designed with EKS and Sunburner fibres as the main moisture-absorbing heating fibres,cotton and viscose fibres as secondary moisture-absorbing heating fibres and acrylic fibres as warming fibres to investigate the effect of moisture-absorbing heatemitting fibres,types of auxiliary moisture-absorbing heat-emitting fibres and different blending ratios on yarn properties.Secondly,design and performance study of EKS blended yarns.The results show that the ten yarns developed meet the requirements of FZ/T 21005-2014 "Cotton natural yarns for knitting" in terms of breaking strength and the rest of the yarn properties,except for the 40% cotton/40% acrylic/20% EKS yarn which has a breaking strength0.55% lower than the standard.Compared to the two hygroscopic heat-emitting fibres,yarns containing EKS fibres have a higher number of harmful hairiness,lower yarn dryness irregularities,coefficient of friction,tensile properties and hygroscopic properties than yarns containing Sunburner fibres.Compared to the two auxiliary heatabsorbing fibres,cotton-containing yarns have poorer yarn quality and moisture absorption compared to viscose containing yarns.When blending viscose fibres,acrylic fibres and EKS fibres,the EKS fibre content decreases when the blend ratio of viscose or acrylic fibres remains unchanged,resulting in an increase in the tensile properties and coefficient of friction of the yarn,an increase in hairiness and a decrease in moisture absorption and unevenness.At a certain EKS fibre content,the increase in viscose fibre leads to a reduction in yarn hairiness and an increase in unevenness and moisture absorption,with no effect on yarn strength.Thirdly,the preparation and properties of EKS fibre knitted fabrics were studied.The 10 yarns mentioned above were woven into double ribbed fabrics and tested for heat and moisture properties and other wear properties.The results show that EKScontaining fabrics are less warm and hydrophilic than Sunburner-containing fabrics,while the moisture-absorbing and heat-emitting properties,top breaking strength,permeability and drapability are lower.Compared to knitted fabrics containing viscose fibres,cotton-containing knitted fabrics have poorer performance than viscose fibrecontaining knitted fabrics,with the exception of fabric strength.The effect of yarn blending ratio on fabric performance is mainly manifested when acrylic fibres,viscose fibres and EKS fibres are blended,for the moisture absorption and heat generation performance of the fabric,the increase in viscose fibre content has a significant effect on the increase in the maximum 30 min temperature rise value of the fabric,and the increase in EKS fibre content has a significant effect on the increase in the average30 min temperature rise value of the fabric.When fixing the viscose or acrylic fibre content,the decrease in EKS fibre content increases the top breaking strength,permeability and drapability of the fabric and decreases the moisture absorption and water conductivity.As for the warmth of the fabric,the warmth of acrylic,EKS and viscose fibres decreases in descending order.When the EKS fibre content is fixed,an increase in viscose fibre content leads to an increase in moisture absorption and heat generation properties,permeability,moisture absorption and drapability,while the warmth,top breaking strength,water conductivity,water evaporation rate and drapability of the fabric decrease.Fourthly,the development of EKS fiber thermal knitted fabrics.Through the above research on EKS fibre yarns and fabrics,two of the yarns with better moisture absorption and heat retention properties were selected to develop a total of 10 fabrics in three categories: quilted fabrics,padded fabrics and added yarns,with the aim of making thermal underwear.The results show that fabrics developed from the same moisture wicking and heat generating yarn have the highest warmth and lowest strength for quilted fabrics,the highest breathability and moisture permeability for timber fabrics,and the highest moisture wicking and heat generating properties and strength for padded fabrics.The fabric strength and breathability of other fabrics meet the requirements of thermal underwear,except for the breathability of the padding fabric which does not meet the standard requirements of knitted underwear.Secondly,the addition of quilted areas reduces the moisture-absorbing and heat-generating properties of the fabric,its warmth and other heat and moisture properties.Compared to traditional thermal fabrics,the EKS fabric shows a small reduction in thermal resistance and a large increase in moisture absorption and heat generation properties.Finally,a fuzzy mathematical approach was used to evaluate the overall thermal and moisture properties of the fabrics,with the quilted fabrics having the best overall performance,the yarn added fabrics the second best and the padded fabrics the worst. |
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