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首页> 外文期刊>Journal of Adhesion Science and Technology: The International Journal of Theoredtical and Basic Aspects of Adhesion Science and Its Applications in All Areas of Technology >Static and Dynamic Aspects of Liquid Capillary Flow in Thermally Bonded Polyester Nonwoven Fabrics
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Static and Dynamic Aspects of Liquid Capillary Flow in Thermally Bonded Polyester Nonwoven Fabrics

机译：热粘合聚酯非织造布中液体毛细流动的静态和动态方面

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摘要

The weight gain method is employed to study the vertical capillary flow of wetting liquids in polyester non-woven fabrics with different basis weights.The quantity of liquid absorbed by capillarity in the nonwoven is recorded as a function of time,until saturation.The liquid retention capacity of the nonwovens has been studied from their"saturation level",i.e.the fraction of pore volume effectively filled with liquid.It is found that this saturation level varies greatly with the type of nonwoven,and generally decreases with nonwoven thickness.Moreover,the expected 100% value is rarely attained even when the sample height is smaller than the Jurin equilibrium height.These observations are attributed to the more heterogeneous pore sizes in very thin nonwovens,where the interconnection of large and small pores inhibits the continued capillary rise of liquid front.The other part of the study concerns the kinetics of liquid capillary flow which has been analyzed by taking into account the contribution of the meniscus in filling the pores.By subtracting this contribution from the mass of liquid absorbed,the new absorption mass is found to vary linearly with the square root of time,in agreement with the Washburn theory.For the thinnest nonwovens,the very small and unrealistic values of Washburn radii deduced from the experimental results do not correspond to the real physical pore sizes,but reflect slow capillary kinetics.This phenomenon is,however,less important when the thickness of the sample increases.
机译：采用增重法研究了不同基重的聚酯无纺布中润湿液的垂直毛细流动。毛细作用在无纺布中吸收的液体量被记录为时间的函数，直到饱和为止。从其“饱和度”，即有效填充液体的孔体积的比例，研究了非织造布的容量。发现该饱和度随非织造布类型的不同而变化，通常随非织造布厚度的增加而降低。即使样品高度小于Jurin平衡高度，也很少能达到预期的100％值。这些观察结果归因于非常薄的非织造布中孔径更不均一，其中大孔和小孔的相互连接阻止了液体的持续毛细上升该研究的另一部分涉及液体毛细管流动的动力学，已通过考虑通过吸收液体的质量减去此贡献，发现新的吸收质量与时间的平方根呈线性变化，这与Washburn理论是一致的。对于最薄的无纺布，根据实验结果得出的Washburn半径较小且不切实际的值并不对应于实际的物理孔径，而是反映了缓慢的毛细管动力学。但是，当样品厚度增加时，这种现象就不那么重要了。

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