MODELING AND CFD-SIMULATION OF WOVEN TEXTILES TO DETERMINE PERMEABILITY AND RETENTION PROPERTIES

S. Rief1, E Glatt1, E. Laourine2, D. Aibibu2, C. Cherif2, A. Wiegmann1
1Fraunhofer-Institut für Techno-und Wirtschaftsmathematik ITWM, Kaiserslautern
2Institute of Textile Machinery and High Performance Material Technology (ITM, TU Dresden)
Contact: Chokri.Cherif@tu-dresden.de

 

The previous paper (No. 2, Vol. 12-2011) [1] were analyzed the weave and construction parameters of high density woven fabric and their influence on the pore morphology, which directly effects the functional properties such as permeability and retention. The analysis encompassed physical and optical methods of testing. In this paper, newly developed methods, tools and programs will be presented for virtual imaging of the multi-filament woven fabric geometry with pore structure used to determine permeability and retention properties. Two methods are applied for the generation of virtual fabric. One method involves developing software that is able to model woven fabric in new condition from a series of realistic input parameters. In this step, deterministic and stochastic methods are combined to create the fabric’s geometry. The other method involves reconstruction/generation the 3D woven geometry from sequences of 2D cross section images. The results prove that the 3D pore morphology of high density multi-filament fabric can be illustrated in correlation of the woven construction parameters. The developed methods for modeling and the CFD simulation of woven fabric build an important basis for determining the mechanical flow properties such as permeability and retention characteristics of filters and barrier textiles. Additionally, the effects of mechanical loads on the fabric morphology and on the permeability values will be analyzed by applying uniaxial and biaxial tensile loads to the fabric. The tests provide the basis for a realistic prediction to the effects of the machine and construction parameters on the fabric properties and the resulting permeability and retention. These predictions can aid in analyzing the suitability of a fabric for a specific application.

Date Added: 2011-10-23
Date Added: 2011-10-23

DETERMINATION OF SURFACE FREE ENERGY OF POLYAMIDE, POLYPROPYLENE AND POLYETHYLENETEREPHTALATE SURFACES FROM CONTACT ANGLE HYSTERESIS

Marcela Bachurová, Jakub Wiener
Department of Textile Chemistry, Technical University of Liberec, Studentská 2, 46117, Czech Republic
e-mail: marcela.bachurova@tul.cz, jakub.wiener@tul.cz

 

Contact angle measurement is a method of surface characterisation of solid materials. The basis of this measurement is to determine the surface energy of solids and thus obtain information on the behaviour of the surface: if it, for example, applies a thin layer on the surface of another material. The surface energy can be determined using contact angle hysteresis, which was used this work.

Date Added: 2011-10-23
Date Added: 2011-10-23

IMPARTING PROTECTIVE PROPERTIES TO LYOCELL VIA FINISHING TREATMENTS

Ajoy K. Sarkar and Gunjan Vora
Colorado State University, Department of Design and Merchandising
Fort Collins, CO 80523, USA

 

Lyocell fabric was analysed for its protective properties against UV radiation and disease-causing microbes. Unfinished lyocell fabric afforded no protection against UV radiation and also possessed no antimicrobial activity against the two microbes investigated in this study. To improve its protective properties, lyocell was finished with a UV absorber. To enhance its antimicrobial properties, lyocell was treated with an antimicrobial agent. It was experimentally determined that an optimum UV absorber concentration of 2% of the weight of the fabric was sufficient to improve the UV properties of lyocell fabric to an excellent degree. The optimum antimicrobial concentration for excellent antimicrobial activity was found to be 0.5% of the weight of the fabric. Subsequently, lyocell fabric was finished with the optimum amount of UV absorber and antimicrobial agent in a combined multi-functional bath. The data showed that the UV protection of lyocell fabric was not negatively affected when a multi-functional bath was employed. Similarly, the antimicrobial efficiency was not reduced by multi-functional finishing treatment. Further, the finishing treatments, whether applied singly or in a multi-functional bath, were durable to laundering and to light exposure. 

Date Added: 2011-10-23
Date Added: 2011-10-23
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