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

用于过滤和外科纺织品的高密度机织阻隔织物的特征在于纱线互锁点之间的可渗透孔隙通道。 通过高密度编织可以减小这些孔道的尺寸。然而，这对功能特性具有负面影响。 因此，本研究项目的目的是开发一种新型的，流体密封和颗粒密封的机织织物，具有可调节的孔隙率，而不损害生理特性。这一研究目标可以通过交叉交联、功能化微粒子的靶向和局部应用来实现。在第一个项目阶段，成功开发了一种基于错流过滤技术的新方法，用于制造用作过滤介质和外科可重复使用纺织品的不透流体的复丝机织物，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，进行了必要的模拟颗粒沉积或在织物的介孔。基于项目第一阶段的良好结果，将通过使用个位数微米范围内的各种尺寸的颗粒来开发具有预定孔隙率的流体密封聚酯微丝机织物。将采用机织物的定制表面功能化，以确保在复杂的准实际应力（例如，G.组合的弯曲/压力、双轴拉伸和剪切载荷）。此外，这些织造织物应满足过滤介质的要求。为此，将开发一个连续的虚拟模拟链，并对相关工艺参数进行验证。必须创建FEM织物模型，该模型显示取决于材料、结构和编织参数的孔隙形态。为了确定颗粒尺寸和工艺参数，将通过织物模型来模拟颗粒布置。孔隙形态的变化和准实际应力下的颗粒行为将通过一个组合的织物颗粒模型进行分析。另一个目的是建立用于连续模拟在错流过滤期间发生的颗粒与织物表面的相互作用的先决条件。此外，颗粒整理机织物的结构变形，特别是在介孔，必须记录下准实际的隔膜负载，以提供一种可能性，以验证数值模拟。还应研究通过氨基官能化将颗粒结合到纤维表面上的稳定性。此外，还必须分析气相色谱法在颗粒整理机织物的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.