فصلنامه علوم و فناوری نساجی
سال هشتم شماره 3 (پاییز 1398)

Due to the environmetal and health related problems associated with the use of synthetic dyes, there is a growing tendency for the use of eco-friendly and less harmful natural dyes in the textile industry. In this study, the leaves of Citrus aurantium were used as a new source for environmentally-friendly dyeing of wool. The effect of four important variables including dye concentration, mordant concentration, pH, and dyebath temperature on the color strength of the dyed samples was investigated. Box-Behnken design and response surface methodology was employed for the design of the experiments and analysis of the obtained data. the results showed that the highest color strength was obtained when dyeing using 150 %owf of the natural dye powder and 5.5 %owf of aluminum sulfate, at pH=8 and 76 °C. The sample dyed at the optimal conditions was tested for fastness properties and showed acceptable fastness against washing, light, and rubbing.

identity and customer purchase behaviour. The purpose of this study is to study the factors affecting the customer purchase behaviour towards clothing with Sasanian empire designs employing a combined statistical method including TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) and AHP (Analytic Hierarchy Process). The statistical population of the study included five selected buyers from a pool of respondents by targeted sampling method. The indicators were extracted at two levels, which include criteria and options, using library studies and expert opinions. According to the research findings, in the first level, the brand’s subjective image criterion with a weight of 0.449 was the first priority. The brand advertisement criterion with a weight of 0.311 was the second priority. The criterion for buying behaviour with a weight of 0.240 was the third priority. In the second level, the options of style, color & fabric, and the use of accessories were ranked the first, second, and third, respectively. Therefore, the option of fashion style was more important than the option of color and fabric and the use of accessories.

Abstract Silk is a natural protein fiber produced from Silkworm. Silk fibers have special properties including brightness, high mechanical properties and biocompatibility. In this study, the silk coloration using a range of synthetic textile dyes including acidic, metal-complex, reactive and basic was studied and  the pros and cons of  each class of dyes on silk fibers were discussed. These classes of textile dyes have all considerable affinity towards silk fibers. However, basic, acidic and reactive dyes have the highest brightness, and metal complex and reactive dyes have the highest washing and optical fastness. The lowest fastness properties were obtained when silk fibers were dyed with basic and acidic dyes except for the dyes based on anthraquinone derivatives. Silk fibers are normally dyed with  acidic, metal complex or basic dyes in weak acidic media while they are preferably dyed with  reactive dyes under slightly alkaline conditions.

Understanding the thermal properties of textiles, such as thermal comfort, thermal protection, and thermal insulation, is one of the topics of interest in textile industry and clothing. The thermal resistance of textiles is a detrimental parameter in heat transferand it can be obtained by experimental, analytical, or numerical methods. The thermal behavior analysis of textiles that have different geometrical and structural properties is possible by experimental methods. Different parameters affect the thermal properties of fabrics including the type of material, morphological properties, fineness, cross-section, porosity, yarn structure, fabric structural, fabric finishing. The aim of this paper is to review the published experimental results on the thermal behavior of textiles. In this paper (part I), we list the measuring methods of thermal properties and discuss the geometrical and structural parameters affecting the thermal conductivity in textiles.

The effect of structural and geometrical parameters of textiles on their physical and thermal properties can be understood using simulation and modeling methods. Various studies have been conducted to model the heat transfer in textiles to determine their temperature distributions and thermal conductivities. The geometry and composition of materials should be introduced to these models by a network of nodes related to each other by a series of heat transfer equations.  The heat transfer equations are solved simultaneously by numerical methods by considering the boundary conditions. To study the heat transfer through textiles, one can use the corresponding equations for porous materials. The analytical solution is used in relatively simple/simplified problems with acceptable approximations, and the numerical solution is employed for solving more complex problems with finite difference methods, finite components, and finite volume. This study reviews the research on modeling methods to determine the thermal properties of textiles.

In this paper, polyacrylonitrile-nanopolyxomolybdate PAN-{Mo154} composite nanofibrous membrane was prepared by electrospinning under ambient conditions.  Nanofibers with an average fiber diameter of 100 nm were obtained under optimized conditions: 8wt.% of polyacrylonitrile, applied voltage of 12 kV, feed rate of 0.1 ml/h, nozzle to collector distance of 15 cm, and the collector rotating speed of 600 rpm. The structure of composite nanofibers was evaluated using SEM, TEM, FT-IR and UV-Vis techniques. The fabricated nanofibrous membrane was used for the adsorption of capsaicinoids. The maximum adsorption of capsaicinoids was obtained in about 30 minutes. The optimized nanofibrous membrane showed high efficiency 92-98% in adsorption of capsaicinoids.  These biocompatible, non-toxic nanofibrous membranes can be produced fast with low cost and they have high adsorption capacity for capsaicinoids. Thus, they can be used in protective clothing and respiratory masks.