| Fire clothing is one of the key equipment items to protect the personal safety of the fire fighters, the study of this subject is the insulation layer of fire clothing, Currently insulation on the market are based on aramid 1313 and aramid 1414 blended at a ratio of 70/30 or 80/20, the insulation layer has been able to meet the basic requirements of fire insulation, but its cost is too high and can?t make sweat, moisture of the comfort layer discharge. This paper intends to add a homemade flame-retardant fiber- PSA, replace part of aramid fiber and use spun-lace technology to process the insulation layer, which should meet the basic requirements of fire-retardant insulation, heat insulation, and has the lowest cost, and this is important to expand the application of PSA fiber; this study also attempts to make one side of insulating layer hydrophilic, so that the two sides of insulation layer have the different hydrophilic properties, thus contributing to transfer sweat from the poor hydrophilic inner layer to good hydrophilic outer layer, and under the action of heat from outer layer, the sweat will be converted to steam, and evaporate from breathable waterproof layer, in this way we can improve the wicking performance of insulation layer.Fibers experiment about PSA, aramid 1313 and aramid 1414 show that: the strength of Aramid 1414 is very high, which can improve the product’s strength and toughness, while the strength of PSA and aramid 1313 are distributed between 3 ~ 4c N/dtex, lower than general chemical fiber; The friction coefficients of aramid 1313 is higher than PSA fiber and aramid 1414, which is helpful to the mutual entanglement between fibers; After prolonged treatment at high temperatures, the PSA has a minimal damage, lowest heat shrinkage and highest strong retention, indicating that the heat resistance of PSA fiber is superior to aramid 1313 and aramid 1414; The LOI of PSA is up to 33%, 3% higher than the aramid 1313, 7% higher than the aramid 1414, explained the flame-retardant property of PSA is better; the moisture regain of PSA, Aramid 1313 and Aramid 1414 are higher than ordinary fiber, indicating that they has good moisture absorption, which is helpful to the mutual entanglement between fibers in spun-lace process.The study use the same netting, spun-lace technology manufacture 7 insulation layers which have different proportions of PSA, aramid 1313, aramid 1414, then analyze their mechanical performance, air permeability, flame retardancy, high temperature resistance, Thermal Protective Performance(TPP). The results show that by increasing the content of PSA fiber in the insulation layer, air permeability, flame retardancy, high temperature resistance and TPP, are improved whereas the mechanical performance is decreased. Based on these results, an optimal blending ratio of PSA/aramid 1313/aramid 1414 fibers is 40/40/20 was found.The study analyzes how the spun-lace pressure, spun-lace channel number and transmission belt speed affect insulation layer by Single factor method, The results show that: increase spun-lace pressure and times, the tangles coefficient will also rises, but the rate of increase gradually decreases; increase transmission belt, tangles coefficient will reduce; the best tangles coefficient of insulation layer is 4.64.The unidirectional wet of insulation layer were also discussed, compositing flame retardant viscose fiber which has good moisture absorption and flame retardant properties to one side of insulating layer, so that both sides of insulating layer have the different hydrophilic properties, then test insulating layer?s wicking properties, find its moisture permeability rate has increased, but only slightly, indicating that the way of improving the unidirectional wet of insulation layer need to further study. |
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