Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (12): 54-58.doi: 10.13475/j.fzxb.20200303105

• Textile Engineering • Previous Articles     Next Articles

Effect of open/closed air layer on thermal protective performance of flame-resistant fabrics

WANG Qi1, TIAN Miao1,2(), SU Yun1,2, LI Jun1,2, YU Mengfan1, XU Xiao1   

  1. 1. College of Fashion and Design, Donghua University, Shanghai 200051, China
    2. Key Laboratory of Clothing Design and Technology, Ministry of Education, Donghua University, Shanghai 200051, China
  • Received:2020-03-11 Revised:2020-07-31 Online:2020-12-15 Published:2020-12-23
  • Contact: TIAN Miao E-mail:tianmiao@dhu.edu.cn

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Abstract:

To investigate the effects of heat transfer modes on appearance and thermal protective performance of thermal protective clothing with an air layer, the thermal protective performance (TPP) tester was established to simulate the actual spatial relationship between the human skin and garment with an open or closed air layer. Color image processing was used to evaluate the shrinkage of the fabrics before and after the heat exposure. The heat transfer and thermal protective performance of the “fabric-air layer” system were evaluated from the perspectives of energy transfer, TPP value and second degree burn time. Experimental results reveal that the presence of air layer decreases the heat transfer efficiency and improves the thermal protective performance of the flame-resistant fabrics. However, it also accelerates the aging and thermal shrinkage of the fabrics. When the heat exchange path between the air layer and the surrounding environment is opened, the fluid flow of heat within the air space becomes much sophisticated, and the thermal protective performance of fabric is further improved.

Key words: flame-resistant fabric, open air layer, closed air layer, heat transfer mode, thermal protective performance

CLC Number: 

  • TS941.73

Tab.1

Basic physical properties of specimens"

试样
编号		 织物名称 纤维成分及含量 组织
结构		 织物密度/
(根·(10 cm)-1)		 面密度/
(g·m-2)		 厚度/
mm
经向 纬向
N1 Nomex®ШA 间位芳纶/对位芳纶/抗静电纤维(93/5/2) 平纹 184 160 240 0.50
N2 Nomex®ШA 间位芳纶/对位芳纶/抗静电纤维(93/5/2) 平纹 143 153 250 0.52
N3 Kevlar 对位芳纶/间位芳纶(60/40) 平纹 214 192 200 0.34

Fig.1

Schematic diagram of three modes of air layer. (a) Device without air layer; (b) Device with closed air layer; (c) Device with open air layer"

Fig.2

Images of N1, N2 and N3 samples after heat exposure for 4.5 s at device without air layer (a), with closed air layer (b) and open air layer (c)"

Tab.2

Area retention rates of N1 and N2 samples after TPP test"

空气层形式 热暴露时间/s RN1/% RN2/%
无空气层 3.5 99.8 90.1
4.5 95.0 86.9
5.5 93.9 86.1
封闭式
空气层		 3.5 94.2 87.8
4.5 90.0 87.3
5.5 92.1 85.4
开放式
空气层		 3.5 94.0 85.2
4.5 92.6 82.5
5.5 86.6 81.9

Tab.3

Temperature rise of copper sensor"

空气层形式 热暴露时间/s ΔT1/℃ ΔT2/℃ ΔT3/℃
3.5 2.73 3.10 5.43
无空气层 4.5 6.27 6.77 11.10
5.5 12.80 11.80 18.90
封闭式
空气层		 3.5 1.23 1.40 2.43
4.5 3.17 3.33 4.83
5.5 5.97 5.63 8.83
开放式
空气层		 3.5 0.70 0.87 1.53
4.5 1.90 2.20 3.43
5.5 2.83 4.57 7.20

Tab.4

TPP value and second degree burn time of fabric"

试样
编号		 无空气层 封闭式空气层 开放式空气层
TPP值/
(kW·s·m-2)		 t2/s TPP值/
(kW·s·m-2)		 t2/s TPP值/
(kW·s·m-2)		 t2/s
N1 10.6 5.3 14.2 7.3 16.0 8.2
N2 11.3 5.8 17.2 8.8 19.9 10.2
N3 8.0 4.0 13.0 6.5 14.7 7.4
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