The Research And Development Of New Instrument For Measuring Fabric Heat Preservation Property And Its Performance Test

Thermal insulation rate of fabric is one of the most important factors to measure the heat transfer property of fabrics.As people step into the wider unknown areas,the research on fabric thermal insulation properties is becoming more and more important for the development of special functional clothing.For the textile heat insulation test,the domestic and foreign production of testing equipment and the corresponding internal control standards are uneven.Among them,one-dimensional steady hotplate apparatus is the most widely used in China.However,some scholars have found that problems exist in the use of traditional hotplate instrument,such as long test time and the heat loss of the instrument itself,resulting in the error of the test results,which all affect the accurate evaluation of the fabric thermal insulation performance.To solve the above-mentioned problems of the traditional flat panel heat preservation instrument,this paper develops a new type of fabric heat preservation performance apparatus that can be used in an open environment based on the test principle of power-compensation DSC.The instrument includes temperature sensor,test platform,the hotplate for blank reference test,the hot plate for sample experiment test,heat insulation board,etc.The innovation of the new apparatus is mainly reflected in the design of parallel double-plate structure of test platform,the hot plate structure and the selection of temperature sensors,which improve the test accuracy of the temperature acquisition module.Subsequently,in order to effectively evaluate the test performance of the new fabric thermal insulation instrument,the comparison and analysis with the domestic YG606F flat thermal insulation instrument were carried out from results relevance,stability and instrument test efficiency respectively.The results show that the Pearson correlation coefficient between the traditional YG606F and the new fabric thermal insulation instrument are both more than0.97,which show a high correlation degree for both.The repeated test standard of the thermal insulation rate of the new thermal insulation instrument is 52.1%,80%and 84%lower than that of YG606F plate tester,respectively.Under the same test conditions,the preheating efficiency of the new fabric thermal insulation instrument is 89%higher than that of the YG606F.Besides,test duration of the YG606F for different fabrics all exceeds 700s,which is less than 400s for new fabric thermal insulation instrument.Based on the advantages of the new fabric heat preservation instrument that can be used in open environment,the effect of air velocity on the heat preservation performance is studied.The research proves that with the increase of the airflow speed,the heat preservation rate of fabrics also increases.Therefore,the experiment proves that the new fabric thermal insulation instrument can realize accurate,reliable and stable fabric thermal insulation performance test under steady state.Finally,further research based on the new fabric heat preservation instrument was carried out,which focus on the warm and cold sensation caused by the fabric contacting the simulated skin,and the dynamic and unsteady heat transfer process during the drying process of the wet fabric.Firstly,the temperature and power model during heat transfer process of the fabric were established when it touches the hot plate.Then,the characteristic parameters of fabric's warm and cold feeling-P_max,W,T_min,T_f,t,were put forward,and the influence of the number of fabric layers,moisture content and fiber raw materials on the warm and cold feeling of the fabric were also explored.Subsequently,an unsteady heat transfer model was established for the drying process of wet fabrics,and a calculation method for fabric drying rate was proposed.Besides,the influence of unsteady conditions such as moisture content and air flow rate on the drying rate of fabrics was explored.Finally,The drying process of single-side moisture transported polyester fabric has been experimentally analyzed.