| In this era of rapid economic and technological development,sedentary work,bad posture,lack of exercise and other factors become the reason that chronic diseases related to microcirculation disorders like shoulder and neck pain tend to happen to younger people.Far infrared is widely used to adjuvant treatment of related diseases to relieve the symptoms because of its physiological effects such as improving microcirculation and strengthening metabolism.And more and more researchers begin to pay attention to the effect of far-infrared fabric on human physiology.In this regard,far-infrared fiber is applied to seamless knitted fabric,and the effects of different structure parameters of seamless knitted fabric on human skin microcirculation blood flow promotion ratio and wearability are studied,which provides theoretical basis and reference for the design and development of far-infrared seamless knitted health underwear.In this paper,through the design of two kinds of knitted fabric structure,plain stitch and 1+3 false rib,and seven different surface layer yarns,which includes coffee carbon nylon yarn,coconut carbon nylon yarn,alloy germanium nylon yarn,bamboo carbon nylon yarn,graphene nylon yarn,taijishi nylon yarn and ordinary nylon yarn,14 sample knitted fabrics with the same inner layer yarn,nylon/spandex core spun yarn,were woven on seamless knitting machine according to the experimental method of full test.In order to study the influence of fabric on microcirculation blood perfusion of human skin,the far-infrared emissivity and far-infrared temperature rise of 14 kinds of fabrics were tested to study the influence of fabric structure and surface yarn material on far-infrared emissivity and far-infrared temperature rise of fabrics.The results show that the far-infrared emissivity and temperature rise of the fabric can be improved by adding the far-infrared surface yarn,especially the alloy germanium nylon yarn.The far-infrared emissivity and temperature rise of 1+3 false rib knitted fabrics are smaller because of its uneven surface and larger fabric pores.Secondly,the alloy germanium nylon seamless plain knitted fabric with the best far-infrared emissivity and the ordinary nylon seamless plain knitted fabric were selected,with the fabrics that have different perforated coverage,fabric width and fabric coverage time,the BVI vascular imaging instrument was used to compare the blood flow promotion ratio of skin microcirculation on the inner side of left forearm of 10 adult women,so as to obtain the optimal skin microcirculation test scheme,The results show that the optimal test scheme of skin microcirculation was hole covering,fabric width of 10 cm and fabric covering time of20 min.Finally,the optimal skin microcirculation test scheme was used to calculate the promotion ratio of the microcirculation blood flow of the inner skin microcirculation of10 adult women with similar age,so as to study the influence of fabric structure and surface yarn material on the blood flow of skin microcirculation.The results show that:the bamboo charcoal nylon flat needle seamless knitted fabric has a relatively high promotion ratio to the microcirculation blood flow of the inner skin of human left forearm;the biggest factor affecting the promotion ratio of the seamless knitted fabric to the microcirculation blood flow of human skin is the surface yarn material,followed by the fabric structure;The promotion ratio of human skin microcirculation blood flow is almost positively correlated with far infrared emissivity of seamless knitted fabric.By testing the wearability of 14 kinds of knitted fabrics,including warmth retention,air permeability,moisture permeability,moisture absorption,antistatic,rigidity and flexibility,wrinkle recovery and pilling resistance,the influence of fabric structure and surface yarn material on the wearability of knitted fabrics was studied,the results show that: in the comfort test of fabrics,the most important factors affecting the warmth retention,air permeability,moisture permeability and moisture absorption of fabrics are the surface yarn materials.The addition of far-infrared surface yarn materials,especially the addition of graphene nylon yarn,can significantly improve the warmth retention of fabrics,and the thicker the knitted fabric is,the better the warmth retention of fabrics is;the addition of graphene nylon yarn can improve the air permeability of the fabric,and the 1+3 false rib knitted fabric has larger pores and better air permeability;the addition of far-infrared surface layer yarn,especially the alloy germanium nylon yarn,can significantly improve the moisture permeability of the fabric;the addition of coffee carbon nylon yarn and bamboo charcoal nylon yarn can improve the moisture absorption of the fabric,which may be related to the porous structure of the two materials;The fabric structure is the most important factor affecting the antistatic performance of fabric,and the thinner the fabric is,the better the antistatic performance is.In the wearing appearance test,it can be seen that the fabric structure is the biggest factor affecting the rigidity,flexibility and wrinkle recovery of knitted fabric,followed by the surface yarn raw materials.The rigidity,flexibility and wrinkle recovery of graphene fabric are generally better.The knitted fabric is softer while using plain stitch,and has stronger wrinkle resistance while using 1+3 false rib.Fuzzy comprehensive evaluation was supplied based on the data of various performance tests and human skin microcirculation blood promotion ratio test,and the weight value was obtained by questionnaire survey.Through calculation,the comprehensive performance from good to bad are as follows:7#>5#>10#>9#>11#>8#>3#>4#>6#>2#>1#>12#>14#>13#.It can be seen that the comprehensive properties of7# and 5# seamless knitted fabrics are relatively better.According to the results of fuzzy comprehensive evaluation,combined with the position of clinical application for relieving shoulder and neck pain,the determination of human acupoints for relieving shoulder and neck pain,and the understanding of ergonomics and sports thermal comfort,the seamless knitted garment was designed differently in different areas.Shoulder,both sides of upper back and forearm area are the main relieving areas of shoulder and neck pain,so that the fabric scheme 7#,which is plain knitted with 100% bamboo charcoal nylon yarn as its surface layer yarn,with relatively good comprehensive performance should be weaved in this area;The upper arm region has certain requirements for moisture permeability and the promotion ratio of human skin microcirculation blood flow,while the abdomen and both sides of the waist region have certain requirements for moisture permeability and heat preservation.Considering the balance aesthetic feeling of the design,the upper arm,abdomen and both sides of the waist region would better adopt the scheme of medium moisture permeability,good heat preservation and medium promotion ratio of human skin microcirculation blood flow,so the supplied fabric scheme in this area is 8#,which is1+3 false rib knitted with 100% bamboo charcoal polyamide yarn as its surface layer yarn;The front chest,middle upper back and middle lower back have certain requirements for moisture permeability,so the scheme 5# with excellent moisture permeability and medium warmth retention is adopted,and scheme 5# is plain knitted with 100% alloy germanium nylon yarn as its surface yarn.Thus,a far-infrared seamless knitted underwear with the effect of promoting blood microcirculation of human skin for autumn and winter was developed and designed,which provides theoretical basis and reference for the design of far-infrared health seamless knitted fabric. |
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