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Super Absorbent Nonwovens for Protective Apparels

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For the wet fabric the temperature almost stabilises after 1hr of experiment, whereas, for dry fabric it continues to increase. The reason for this is that the total amount of incoming heat being used for evaporation. Thus little or no heat is reaching to the sensor and the temperature remains almost stable at 48.0 0.5C. Once the sample dries up completely, the temperature again starts to increase. At the initial stage some amount of heat reaches the sensor and the rest is used for evaporation. Rate of evaporation at this stage is also slow. For this reason, temperature rise is observed in the initial stage of the experiment.


Comparison of needle punched Vs. Thermal bonded structure


A comparison was studied between a needle punched structure and a thermal bonded structure containing 20% SAF, having a basis weight of 200 g/m2 and thickness 4 mm. The needle punched structure was made on DILO needle punching machine and punch density was kept 60/cm2. Figure 4 shows the result obtained at 1.0 kW/m2 heat flux. Thermal bonded structure shows better performance than the needle punched structure. Time required to reach 45C is 3.22 hrs for the thermal bonded structure and 2.28 hrs for the needle punched structure. The reason may be the presence of holes created by the needles in the needle punched structure. We can consider the holes to be water channel when the samples are in wet condition. Thus helping in quicker heat conduction and increases the rate of evaporation, resulting in poorer performance of the needle punched structure.



 

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