Study on the influence of opening design of cold-proof clothing on its thermal insulation
The human body dissipates heat rapidly at low temperatures,and it faces the risk of freezing,frostbite,and even death if it fails to maintain the physiological thermal balance.It is an efficient way of promoting the thermal insulation of the garment to achieve the thermal balance of the human body by changing its opening design.Although many studies have been conducted on the impact of clothing(including the style and pattern)or the external temperature on heat transfer of clothing,most of them focus on one single factor,with the combined factors being rarely discussed in depth.This paper discussed the impact of different arrangements and combinations of three main opening designs of clothing,including the front flap,the cuff and the collar,on thermal insulation performance of cold-proof through thermal manikin at various temperatures.The findings of this study are expected to provide significant instructions for consumers and quantitative reference for the opening design of cold-proof clothing.In the experiment,the study selected a one-piece suit as the original garment to carry out different opening designs,and obtained three types of single-opening clothing,namely,2# clothing with a widened and thickened front fly(2 cm wider and 0.4 cm thicker),3# clothing with tightened cuffs(with a binding size of 16 cm),and 4# clothing with a tightened collar(with a binding size of 30 cm).Such designs are the three main opening designs of cold-proof clothing.The three single-opening designs of 2#-4# were arranged and combined in order to accurately quantify the influence of each opening and combination design on the overall and local thermal resistance of clothing.Four kinds of multi-opening optimization designs were obtained:5# front fly widening and thickening+cuff tightening,6# front fly widening and thickening+collar tightening,7# cuff tightening+collar tightening and 8# front fly widening and thickening+cuff tightening+collar tightening.The study used a Newton thermal manikin to measure the thermal insulation of 34 separate segments including the total thermal insulation and the local thermal insulation of hand,upper arm,forearm,upper chest,lower chest,abdomen,shoulder,upper back,mid back and hip.On this basis,in order to explore the influence of the temperature on the thermal performance of clothing from the perspective of thermal insulation mechanism,four levels of temperatures were selected,including 5 ℃,0 ℃,-5 ℃ and-10 ℃.At the same time,the software,SPSS,was used to statistically compare the total thermal resistance of 1#-4# clothing and 5#-8# clothing at 5 ℃.The local thermal resistance changes of single-opening and multi-opening garments were shown in bar graphs.Finally,the change rates of the overall and local thermal resistance values of at different temperatures were analyzed.The results showed that both the opening design and the temperature have an impact on clothing insulation performance,and the former serves as the most important factor,followed by the second.Compared with single-opening design,the multi-opening design of clothing plays a more important role in promoting the thermal insulation performance of clothing.The thermal resistance increase rate of 8# clothing can reach 7.20％,but the effect of opening design on the thermal insulation performance of clothing is weakened at lower temperatures.In contrast,the 8# multi-opening design has a more obvious promoting effect on the improvement of clothing due to the formation of an enclosed environment at 5 ℃.The findings in this paper can provide objective data for the opening design of cold-proof clothing.In order to achieve the thermal function of winter clothing,it is necessary to consider factors such as materials and the environment.At the same time,the research results can also provide ideas for further analysis of the opening tightening quantity of cold-proof clothing.
万方数据
维普
