Study On Thermal And Moisture Comfort Of Carbon Fiber Heatted Multi-layer Textiles

The functional wearable heating textiles are widely used in many ways.This kind of product combines exogenous heat-generating materials with textiles.Positive warmth style used the outside heating elements to produce the spontaneous heat achieving energy.It has the function of local hyperthermia under cold condition and can be used to health care.Due to its simple heating principle,easy fabrication,and high heat efficiency,people use this in many ways.The electric heating elements are generally classified into heat-generating metal wires,carbon fiber heat-generating materials,and graphene materials.The carbon fiber heat-generating material has become a key research object in electric heating textiles due to their high heat generation efficiency,soft quality,and low cost.In this paper,we use the wearable textile carbon fiber heating wire for the study.First,we analyzed the work and heat stability of the heating wire in textile,thus,we produce the heating module.Then we learn the dependency of the inside layer,the heating layer,and the outside layer between each layer in the multilayer composite fabric is studied and the yarns of different materials are selected to perform skin-like weft knitting techniques.The heating layer is knitted with a spacer and an air layer to facilitate the penetration of carbon fiber filaments without affecting the heating performance.Multiple sets of experiments and physical tests are applied to study the single layer thermal and moisture comfort properties and to determine the physical parameters of various fabrics in each layer.Temperature and humidity data of multi-layer composite fabrics are collected using a constant-temperature,constant-humidity water tank and a simulated skin system,and statistical multivariate analysis is performed based on the data.Taking the neckband as an example,the design and weaving of the heated multi-layer composite fabric are performed,and micro-thermostat are used to achieve the control of the heating temperature of the neckband.(1)Exploration and evaluation of basic physical properties of carbon fiber yarns.The dependency between the electrical resistance stability of the carbon fiber heating wire and the heating temperature & electrical power are studied,and it is determined that the carbon fiber wire has good resistance stability when heated.(2)The dependency between layers of multi-layer composite textiles as long as the material selection are studied.The vertical density,cross-density,g quality and thickness of the fabrics are measured.The indexes related to heat and moisture comfort are measured and analyzed by principal component analysis.The main influencing factors of the thermal and moisture comfort of single-layer fabrics are investigated.It is concluded that the quality of fabric and the horizontal and vertical density were the main indicators affecting the thermal and moisture comfort of single-layer knitted fabrics.The multi-variable analysis of the temperature and humidity difference after multilayer fabric composites and the basic physical properties of each layer of fabrics showed that the thermal and moisture comfort of a single layer of a multilayer composite fabric is affected by the interfacial fabrics.(3)Carbon fiber heating wire products will be designed,boarded and woven.The neckband fabric is designed according to the shape of the neck and weaved with a computer-based flat knitting machine.The test product equipped with the micro-temperature controller works well on the simulated skin and is verified during actual wear.The same heating curve as the experiment data is obtained.It will be believed if the carbon fiber heating products prepared in this paper have good heat generation performance,can achieve temperature control,and have good thermal and moisture comfort properties.