Simulation-based finishing of barrier fabrics by means of partial particle application

用于过滤和手术纺织品的高密度机织屏障织物在纱线联锁点之间具有渗透性孔通道。这些孔道可以通过高密度编织来减小。然而，这对功能特性有负面影响。因此，本研究项目的目的是开发一种新颖的，具有可调孔隙率的流体密性和颗粒密性的机织织物，而不影响其生理性能。可交联的功能化微粒子的定向和局部应用可以实现这一研究目标。在项目的第一阶段，一种基于横流过滤技术的新方法被成功地开发出来，用于生产作为过滤介质和外科可重复使用纺织品的流密多丝机织织物，这些织物具有良好的穿着舒适性。为了最大限度地减少实验工作量，进行了必要的机织物介孔上和介孔内颗粒沉积模拟。在项目第一阶段取得良好成果的基础上，将使用个位数微范围内的各种尺寸的颗粒，开发具有预定孔隙率的流密聚酯微长丝机织物。将采用定制的机织织物表面功能化，以保证在复杂的准实际应力（例如组合弯曲/压力，双轴拉伸和剪切载荷）下，颗粒在纤维表面（中尺度范围）上的永久粘合。此外，这些机织物应满足过滤介质的要求。为此，将根据相关工艺参数开发和验证一个连续的虚拟仿真链。需要建立基于材料、结构和织造参数的织物有限元模型来显示孔隙形态。为了确定颗粒大小和工艺参数，将利用织物模型对颗粒分布进行模拟。采用织物-颗粒组合模型分析了准实际应力作用下孔隙形态和颗粒行为的变化。另一个目的是为在横流过滤过程中发生的颗粒与织物表面相互作用的连续模拟建立先决条件。此外，在准实用膜片载荷作用下，颗粒经整理机织物的结构变形，特别是细观孔隙中的结构变形必须被记录下来，以便为数值模拟的验证提供可能。通过氨基官能化的方法，颗粒在纤维表面的结合稳定性也需要研究。此外，还分析了气相氟化在颗粒经整理机织物永久疏水处理和同时疏油处理中的应用。

High density woven barrier fabrics for filtration and surgical textiles feature permeable pore channels between yarn interlocking points. These pore channels can be reduced in size by high-density weaving. This however has a negative effect on the functional properties. Therefore the aim of this research project is to develop a novel, fluid-tight and particle-tight woven fabric with adjustable porosity without impairing the physiological properties. This research aim could be realized by the targeted and partial application of cross-linkable, functionalized micro particles. In the first project stage a novel method based on the cross-flow filtration technique was successfully developed for the manufacturing of fluid-tight multifilament woven fabrics for use as filter media and surgical reusable textiles, which contain good wearing comfort. In order to minimize the experimental efforts, the necessary simulation of particle deposition on or in meso pores of woven fabric was carried out. Based on the promising results of the first project stage, fluid-tight polyester microfilament woven fabrics with predefined porosity are to be developed by using particles of various sizes in the single-digit micro range. A customized surface functionalization of woven fabrics will be employed in order to guarantee a permanent particle bonding onto the fibre surface (meso range) under complex quasi-practical stress (e. g. combined bending/pressure, biaxial tensile and shear load). Furthermore these woven fabrics should be fulfilling the requirements for filter media. For these purposes, a continuous virtual simulation chain will be developed and validated regarding to the relevant process parameters. A FEM fabric-model has to be created which displays the pore morphology, dependant on material, structure and weaving parameters. To determine the particle size and process parameters the particle disposition will be simulated by means of the fabric model. The change of pore morphology and the particle behaviour under quasi-practical stress will be analysed by means of a combined fabric-particle-model. Another aim is to establish the pre-conditions for a continuous simulation of the interactions of particles with the fabric surface which take place during cross-flow filtration. In addition, the structure-deformation of particle finished woven fabrics, especially in the meso pores, has to be recorded under quasi-practical diaphragm loads, in order to offer a possibility to validate the numeric simulation. The stability of particle bonding onto the fibre surface by means of amino functionalization should be also investigated. Furthermore the application of gas-phase fluorination for permanent hydrophobic treatment and simultaneous oleophobic treatment of particle finished woven fabrics has to be analysed.