| In this thesis,the water-vapour transmission performance of simulated clothing was studied.By testing and analyzing the water-vapour transmission rate of laminated fabric systems,the law of water vapor transmission through clothing materials was discussed.Based on M 261 water-vapour transmission tester,an instrument for measuring the water-vapour transmission performance of "one-layer clothing" and "multi-layer clothing" was developed by designing and making auxiliary devices.On this basis,the law of water-vapour transmission of "clothing" was investigated.The main research contents and conclusions of this paper are as follows:In this thesis,44 kinds of fabrics,including woven fabrics,knitted fabrics and waterproof breathable fabrics,were selected,and the structural parameters and air permeability of the fabrics were measured,and the detailed information of the fabrics was obtained.Under the conditions of 20℃,65%RH and no wind,the water-vapour transmission rate of 44 kinds of fabrics was tested by M 261 water-vapour transmission tester,and the test results were analyzed by independent sample t-test and grey relational analysis.It was found that:(1)There was no significant difference in water-vapour transmission rate between woven fabrics and knitted fabrics,and the ranges of water-vapour transmission rate both were little.The watervapour transmission rate of waterproof breathable fabric was obviously lower than that of woven fabrics and knitted fabrics.(2)Weft density(correlation degree is 0.89)was the most relevant evaluation item to the water-vapour transmission rate of woven fabrics,and air permeability(correlation degree is 0.729)was the least;The area density(correlation degree is0.781)was the largest evaluation item related to the water-vapour transmission rate of knitted fabrics,and the transverse density(correlation degree is 0.588)was the least.Under the conditions of temperature of 20℃,relative humidity of 65% and no wind,the water-vapour transmission rate of the two-layer and three-layer laminated fabric systems of a single fabric was tested and analyzed by using the M 261 water-vapour transmission tester.It was found that the water-vapour transmission rate of the single fabric laminated systems decreased gradually with the increase of the number of layers,but it did not decrease linearly.The decrease rate of water-vapour transmission rate of double-layer laminated fabric systems relative to single-layer fabric was 1.9 ～ 35.8%;The decrease rate of water-vapour transmission rate of triple-layer laminated fabric systems relative to single-layer fabric was 4.2 ～ 61.5%;The water-vapour transmission rate of the laminated fabric systems of coated fabric with low watervapour transmission rate decreased sharply with the increase of the number of laminated layers.(2)The water-vapour transmission rate of 25 kinds of double-layer laminated fabric systems and 25 kinds of triple-layer fabric systems composed of different fabrics were tested and analyzed.It was found that the water-vapour transmission rate of double-layer laminated fabric systems and triple-layer laminated fabric systems composed of different fabrics was lower than that of any single layer fabric in their stacks.The regression equation between the water-vapour transmission rate of double-layer laminated fabric systems and the water-vapour transmission rate x1 of the first layer fabric and the water-vapour transmission rate x2 of the second layer fabric was: y=0.132x1+0.770x2-54.8,R~2=0.993;The regression equation between the watervapour transmission rate of triple-layer laminated fabric systems and the water-vapour transmission rate x1 of the first layer fabric,the water-vapour transmission rate x2 of the second layer fabric and the water-vapour transmission rate x3 of the third layer fabric was: y =0.242x1+0.243x2+0.758x3-331.183,R~2=0.989.(3)The water-vapour transmission rate of 20 kinds of double-layer laminated fabric systems and 30 kinds of triple-layer laminated fabric systems with coated fabrics composed of different fabrics were tested and analyzed.It was found that changing the position of coated fabrics with low moistu re permeability in the double-layer laminated fabric systems and triple-layer laminated fabric systems composed of different fabrics had no significant effect on the water-vapour transmission rate.Under the conditions of 20℃,65%RH and no wind,the water-vapour transmission rate of8 kinds of the simulated one-layer clothing was tested and analyzed with the opening air layer thickness of 4mm,6 mm,8 mm,12 mm,16 mm and 20 mm respectively.In a cer tain range of the thickness of the air layer under the clothes,the water vapor transmission rate of the “onelayer clothing” increased with the increase of the thickness of the air layer “under the clothes”.For ordinary fabrics,the water-vapour transmission rate of the simulated one-layer clothing reached the maximum when the thickness of the air layer “under the clothing” was 16 mm;For waterproof breathable fabrics with low water-vapour transmission rate,the water vapor transmission rate of the simulated one-layer clothing reaches the maximum when the air layer“under the clothing” was 20 mm,and there was almost no difference between the water vapor transmission rate of the simulated one-layer clothing and ordinary fabrics.(2)The water-vapour transmission rates of 25 kinds of the simulated two-layer clothing and 25 kinds of the simulated three-layer clothing were tested and analyzed,and it was found that the water-vapour transmission rate of the simulated three-layer clothing and the simulated three-layer clothing were higher than those of their corresponding laminated fabric systems.(3)The water-vapour transmission rate of 20 kinds of the simulated two-layer clothing and 30 kinds of the simulated three-layer clothing with coated fabrics were tested and analyzed.The position of coated fabrics in the simulated two-layer clothing and the simulated three-layer clothing significantly affected the water-vapour transmission performance of clothing,and the closer the position of coated fabrics was to the “skin”,the worse the water-vapour transmission performance of the simulated clothing was.The conclusion of this thesis can provide guidance and help for the structural design and fabric selection of clothing,also provide reference for the further study of water-vapour transmission performance of clothing. |
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