Effects of moisture on the thermal protective performance of flame retardant fabrics under open/closed air gap condition
To study the effect of moisture under different kinds of air layers on thermal protective performance of fire-fighting fabric,based on TPP value test device,open and closed air layers are constructed.Wet the fabric internally and externally,and test the TPP value of the water-bearing fabric under different air layers.The results show that the open and closed air layers promote the positive effect of moisture on thermal protective performance when the outer layer is wet.When the inner layer is wetted,the TPP value of the fabric under the closed air layer firstly decreases and then increases,and reaches the minimum value at the wetting level of 15%.However,the TPP value of fabric increases with the increase of wetting level under open air layer.When the outer layer is wet,the moisture barrier layer can effectively prevent water vapor from reaching the sensor,which plays an important role in thermal protection.When the inner layer is wet,the mois-ture barrier layer is not conducive to the transfer of water vapor to the outer layer,which has a negative effect on thermal protective performance.However,under the open air layer,the negative effect is not obvious,and the TPP value increases significantly.
万方数据
维普
