Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (10): 141-146.doi: 10.13475/j.fzxb.20181103106

• Apparel Engineering • Previous Articles     Next Articles

Influence of air gap size on steam protective performance of fireproof fabric

CHEN Si1, LU Yehu1,2()   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215006, China
    2. National Engineering Laboratory for Modern Silk, Suzhou, Jiangsu 215123, China
  • Received:2018-11-12 Revised:2019-07-04 Online:2019-10-15 Published:2019-10-23
  • Contact: LU Yehu E-mail:yhlu@suda.edu.cn

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Abstract:

In order to investigate the influence of air gap between fabric layers and human skin on protective performance of protective clothing against steam, three different fabric systems were selected and four levels of air gap, i.e., 0 mm, 6 mm, 12 mm, and 18 mm, were designed. Time to 2nd and 3rd burn degree, total absorbed energy and heat flux were recorded and analyzed to evaluate the impact of air gap on the protective performance. The results show that thermal protection is different for different fabric assemblies. If the fabric thickness is bigger and moisture barrier is arranged more close to the steam hazard, the fabric system provides higher thermal protection. Further, a significant relationship exists between the thermal protection against steam and air gap size. If the air gap size is higher than 12 mm, thermal protective performance against steam exhibits a significant increase. The analysis of heat flux curve during exposure and cooling phase can facilitate the further understanding of the heat and moisture transfer mechanism.

Key words: thermal protective clothing, air gap, steam hazard, protective performance, total absorbed energy

CLC Number: 

  • TS941.73

Tab.1

Properties of single-layer fabric"

面料编号 织物类型 纤维成分 组织结构 厚度/mm 面密度/
(g·m-2)		 透气性/
(cm3·cm-2·s-1)
OS 外层 芳纶1313/芳纶1414(98/2) 斜纹 0.41 186.7 17.1
MB 防水膜 芳纶1313和聚四氟乙烯膜 水刺毡 0.69 106.7 0
CF 复合面料 芳纶1313/芳纶1414(98/2)和聚四氟乙烯膜 涂层 0.63 280.0 0
TL 隔热层 芳纶1313毡和基布 三维间隔 2.73 180.0 662.0

Tab.2

Properties of fabric systems"

系统编号 系统组合 厚度/mm 面密度/(g·m-2)
S CF 0.63 280.0
D1 CF+TL 3.36 460.0
D2 OS+MB 1.13 293.3

Fig.1

Steam test apparatus"

Tab.3

Thermal protection of fabric system with different air gap sizes"

面料
系统		 二级烧
伤时
间/s		 方差/
s		 三级烧
伤时
间/s		 方差/
s		 总吸收
能量/
(kJ·m-2)		 能量
方差/
(kJ·m-2)
S 0.43 5.04 0.49 6.92 382.33 0.91
S+6 mm 0.26 5.50 0.22 7.56 356.40 9.33
S+12 mm 0.09 6.34 0.07 8.39 277.73 9.71
S+18 mm — NB — NB 146.65 0.07
显著性 ** ** **
D1 1.19 18.68 — NB 202.73 4.66
D1+6 mm 0.60 19.30 — NB 192.95 1.91
D1+12 mm 0.94 20.95 — NB 180.17 2.70
D1+18 mm — NB — NB 111.10 2.18
显著性 ** NS **
D2 0.16 4.96 0.52 6.97 417.93 12.53
D2+6 mm 0.50 5.84 0.72 8.26 391.87 10.41
D2+12 mm 0.45 9.50 0.80 12.50 317.20 12.41
D2+18 mm 0.25 14.71 0.99 20.78 225.13 14.69
显著性 ** ** **

Fig.2

Effect of air gap thickness on 2nd degree burn time of fabric"

Fig.3

Effect of air gap thickness on total absorbed energy of fabric"

Fig.4

Heat flux profile of fabric system S with different air gap thickness"

Fig.5

Heat flux profile of fabric system D1 with different air gap thickness"

Fig.6

Heat flux profile of fabric system D2 with different air gap thickness"

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