Textile Research Unit of ISET Ksar Hellal

Qaşr Hallāl, Tunisia

Textile Research Unit of ISET Ksar Hellal

Qaşr Hallāl, Tunisia

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El Abed B.,Textile Research Unit of ISET Ksar Hellal | Msahli S.,Textile Research Unit of ISET Ksar Hellal | Bel Hadj Salah H.,Mechanical Engineering Laboratory of ENIM | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2011

The paper presents the shear frame test with a new method of gripping the fabric sample to describe the shear behaviour of fabrics used in the garment industry under high shear strain conditions (maximum shear angles of 20°). This shear frame test was also used to compare between hysteresis curves given by the Kawabata evaluation system (KES) test, the bias extension test and the shear frame test for 10 woven fabrics. The linear viscoelastic theory was used to analyse the shear relaxation behaviour of the woven fabrics. In addition, in this study, the kernel function of the generalised Maxwell model has been used to describe the viscoelastic properties of the fabrics. © 2011 The Textile Institute.


Jedda H.,Textile Research Unit of ISET Ksar Hellal | Ben Abessalem S.,Textile Research Unit of ISET Ksar Hellal | Ben Abessalem S.,University of Monastir | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2011

In this study, artificial anterior cruciate ligaments (ACLs) were manufactured using braiding and knitting processes. These artificial ligaments were designed to match the mechanical requirements of a native human ACL, including the fatigue performance. The effect of cyclic loading on the mechanical performance of the artificial ligaments was studied at different deformation rates (slow: 2% per second, medium: 50% per second and fast: 100% per second). The primary results showed that the deformation rate had no significant effect on the ultimate tensile strength, strain or stiffness. Single tensile loading to failure performed for each prosthesis before and after cyclic loading allowed the determination of its effect on the mechanical performance of the artificial ligaments. The increase in the number of cycles decreased the maximum strain and the ultimate tensile strength but had no significant effect on the stiffness. At 60,000th cycle, the braided prosthesis presented a better performance with a lower residual deformation compared with the knitted prosthesis. © 2011 The Textile Institute.


Boubaker J.,University of Monastir | Boubaker J.,Textile Research Unit of ISET Ksar Hellal | Ben Hassen M.,Textile Research Unit of ISET Ksar Hellal | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2012

In order to evaluate the abrasion effect on both spliced and parent yarn performances, a newly developed abrader tester simulating the real cumulative weaving stresses is used. Three weaving parameters: loom speed, splice positions during weaving and yarn tension are tested to simulate the mechanical behaviour of spliced and parent thread yarns. The results show that the spliced yarn's abrasion resistance, expressed by lifetime cycle numbers, is more affected by the weaving parameters used in our developed abrader simulator tester than by others. In this work, the results obtained by our simulator abrader tester and the cyclical tensioning ones are compared to regression analysis models. According to the highest coefficients of determination ranging from 0.955 to 0.999, it is found that a good prediction of spliced and parent yarn breakages is possible. Comparing two interesting splice positions on the loom: the splice beat-up position and the splice shedding one, we conclude that the splice shedding position increases breakage rate. © 2012 Copyright The Textile Institute.


Mokhtar S.,Textile Research Unit of ISET Ksar Hellal | Mokhtar S.,University of Monastir | Ben Abdessalem S.,Textile Research Unit of ISET Ksar Hellal | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2010

This paper investigates and reports the effect of some textile parameters (yarn and fabric parameters) on the main performances of plain woven vascular prostheses in order to enhance their overall quality. We weaved tubular structures with different fabric densities using texturized Dacron® polyester filament yarns with different linear densities and filament counts, in warp and weft directions. The performances of the manufactured samples, such as wall porosity, water permeability and mechanical features, have been tested. By adopting a two-level fractional factorial design of experiments, the responses were fitted to predictive models using a multiple linear regression method. The models were tested by variance analysis and validated by correlation between measured and predicted values. We determined the optimum settings of main textile parameters enhancing plain woven vascular prosthesis quality by contour plots method. © 2010 The Textile Institute.


Jaouachi B.,Textile Research Unit Of Iset Ksar Hellal | Louati H.,University of Monastir | Hellali H.,Textile Research Unit Of Iset Ksar Hellal
Autex Research Journal | Year: 2010

In this research, fuzzy modelling and neural network methods were used and compared to predict the residual bagging bend height of knitting fabric samples. Studies undertaken to minimize the bagging phenomenon vary significantly with the test conditions including the experimental field of interest, the input parameters and the applied method. Hence, we attempt to formulate a theoretical model of predicting bagging behaviour in our experimental design of interest. By analysing the bend height of overall bagging samples, this paper provides an effective neural network model to evaluate and predict the residual bagging bend height of the knitting specimens after test. It also provides the impact of each input parameter in our experimental field of interest to simulate this phenomenon after use. Moreover, the contribution of these influential input parameters was analysed and discussed. Nevertheless, our results show that residual bagging height decreases when yarn contains elastane filament, Spandex©. This finding is in agreement with Mirostawa et al. [11] that with an increase of the elastane content in fabric, permanent bagging decreases, whereas elastic bagging increases. According to the analytical results obtained, the neural network model gives a more accurate prediction than the fuzzy one. © AUTEX.


Helali H.,Textile Research Unit of ISET Ksar Hellal | Babay Dhouib A.,Textile Research Unit of ISET Ksar Hellal | Msahli S.,Textile Research Unit of ISET Ksar Hellal | Cheikhrouhou M.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2012

Elastic recovery is one of the most important mechanical properties especially of clothing applications. This property is more and more significant when the textile structure contains elastane filament and has significant elasticity. In this study, we investigate the effect of the Dorlastan® draft and yarn count on the elastic recovery of cotton-covered Dorlastan® core spun yarns. These yarns are used as weft yarns in denim fabrics. Dorlastan® core spun yarns with different counts 100, 50, and 25 tex, with different elastane drawings and with the same twist factor are used. Our test results revealed that the Dorlastan® ratio and yarn count are important factors in influencing the elastic recovery. © 2012 Copyright The Textile Institute.


Helali H.,Textile Research Unit of ISET Ksar Hellal | Babay A.D.,Textile Research Unit of ISET Ksar Hellal | Msahli S.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2012

The main purpose of modelling the yarn structure is to find relations that are more reliable giving the behaviour of the yarn starting from its components. In this paper, the identification of the mechanical behaviour of the elastic core spun yarns by a rheological modelling on the basis of pre-existent phenomenological models is presented. In this model, the elastic core spun yarn is considered as a viscoelastic material. The model is verified experimentally with two types of elastic core spun yarns 50/78 and 59/156 and a range of draft of five values for two types of yarn and two values of elastane count in dtex (78 and 156). Comparative analysis of the theoretical and experimental tensile curves indicates a high level of correlation between both data-sets. The effect of the elastane draw ratios on the parameters of this model is established in the second part of this paper. Our test results revealed that the elastane draft is one of the important factors influencing the elasticity and the viscosity of elastic core spun yarns. © 2012 Copyright The Textile Institute.


Jaouadi M.,Textile Research Unit of ISET Ksar Hellal | Msahli S.,Textile Research Unit of ISET Ksar Hellal | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Materials and Manufacturing Processes | Year: 2011

This article studies the influence of the pulping conditions of Agave americana L. [temperature (100-120C), pulping time (60-120°mn) and soda concentration (4-8%)] on the pulp yield, kappa index, brightness, viscosity, and the hand sheets breaking length, tear index, and burst index. Responses of pulp and hand sheets properties to the process variables were analyzed using statistical software (Minitab 14). Pulp has been studied using a factorial design to identify the optimum operating conditions, equations relating the dependant variables to the operational variables of the pulping process were established. Results showed that acceptable physical and mechanical properties of pulps and paper could be achieved at 107°C, for 60mn, and 6% of soda concentration. These are the most suitable conditions for obtaining paper sheets with a high breaking length and tear and burst indexes. Test sheets made from pulped agave leaf fibers were compared to paper made from other vegetable fibers (pine, agave tequilana, and eucalyptus fibers). Copyright © 2011 Taylor & Francis Group, LLC.


Zaouali R.,Textile Research Unit of ISET Ksar Hellal | Msahli S.,Textile Research Unit of ISET Ksar Hellal | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2010

The textile and clothing industry has conventionally used subjective methods for the assessment of fabric wrinkling. Indeed, the fabrics were usually evaluated subjectively in reference to a set of visual standards. However, the visual assessments of the wrinkling degree, often showing inconsistencies between wrinkle judgments of observers, are severely influenced by the color and the fabric texture which may exist. In this paper, an objective method which permits an evaluation of multidirectional wrinkling of any colored fabric has been developed using digital image analysis. This method consists in capturing images of the color wrinkled fabrics and processing them in simple steps using image-processing software. The surface roughness, density, width, length, number, and height of the wrinkles, considered as wrinkling characteristics, were extracted. Wrinkle degree was selected to use as the comparative parameter of the result evaluation from conventional and digital methods. The wrinkle grade of each fabric sample obtained through the conventional technique was statistically compared with that obtained through the digital technique developed. This study demonstrates that the results of the digital method developed for wrinkle evaluation of colored fabrics were similar to those of conventional methods of wrinkling evaluation. © 2010 The Textile Institute.


Boubaker J.,Textile Research Unit of ISET Ksar Hellal | Chahbani S.,Textile Research Unit of ISET Ksar Hellal | Hassen M.B.,Textile Research Unit of ISET Ksar Hellal | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2010

In this work, a descriptive model was established for the longitudinal structure of wet pneumatic spliced yarn. Compared to classical spliced yarns which contain a symmetrical twisting zone our microscopic analysis revealed that elastic spliced yarns present two more asymmetrical twisted zones. Our study shows that the wet pneumatic splice can be defined by six parameters which are: zones of splice, length of each zone, splice length, number of twist turns on each zone, two elastane filament ends and centre x coordinates. These parameters were tested for 167 specimens. Analysing this database, we developed a descriptive model which helps to understand the spliced elastic yarn structure. © 2010 The Textile Institute.

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