Kashif Iqbal

Development of Thermal Stable Multifilament Yarn Containing Micro-encapsulated Phase Change Materials

Phase change materials are used for the development of thermo-regulating textiles to give thermal equilibrium to the accustomed textiles for changing climates. Phase change materials having their melting point near the skin temperature are found to be useful for textiles in which n-octadecane is widely used. This paper reports the development of multifilament polypropylene yarn containing Microencapsulated Phase Change Materials (MPCM) developed and manufactured by a new designed spinneret die with 7 holes. SEM and DSC have been used to examine the morphology and the latent heat of multifilament Polypropylene yarn containing up to 8 % of MPCM. The effect of processing parameters on mechanical properties of yarn with respect to amount of MPCM has been discussed.

FE analysis of thermal properties of woven fabric constructed by yarn incorporated with microencapsulated phase change materials

Phase Change Materials are the substances which can store or release a large amount of energy in the form of latent heat at certain melting temperatures. Such properties open new opportunities in the development of thermo-regulating textiles for thermal protection against extreme environment. In this work, a woven fabric has been made using a novel synthetic yarn incorporated with Microencapsulated Phase Change Materials and its heat transfer property has been studied using finite element analysis. The result of simulation after post processing has been validated against experimental result. It shows a strong correlation between the predicted and experimental results. Based on validated model, delay in temperature rise as a function of time is also predicted which is not possible to be determined through experiment.

Study of mechanical and comfort properties of modal with cotton and regenerated fibers blended woven fabrics

ABSTRACT The increasing demand of cotton and low production rate to fulfill the world requirements boosted the production of regenerated cellulose-based fibers. The purpose of this work was to compare the performance and comfort properties of regenerated cellulose fibers. For this purpose, cotton, viscose, modal, bamboo, and viscose fibers were taken. The pure blends of each fiber and 50:50 blends of modal blended with cotton fiber and regenerated fibers were taken. Normal yarn of count 20 tex was made and then plain woven fabrics were prepared. The warp-wise and weft-wise tensile and tear strengths were recorded. In addition, tests of air permeability, moisture management, thermal resistance test, and water vapor permeability were executed. It is found that the 100% modal fabrics give higher mechanical and comfort properties. In case of blends, modal:viscose (50:50) gives higher mechanical and comfort properties in woven fabrics.

Development and performance optimization of polyurethane-based multifunctional coatings using Taguchi method:

Inducing multifunctionality is the need of the products used in diverse environments. Here, polyurethane-based water repellent, flame retardant and antibacterial coatings are fabricated on cotton fabrics which sequentially involve the deposition of coating through knife coating, drying and curing of coated fabric. Taguchi design has been used to optimize the parameters for enhanced water repellency, flame retardancy and antibacterial activity. When applied individually, the performance characteristics enhance with the increase in concentration of respective finishing agent. However, a different behaviour was shown by the coated fabric when applied all the finishing agents simultaneously. Taguchi design enabled the monitoring of interdependency of different concentrations of chemicals and finding the most influencing parameters for efficient performance of coated fabrics.

Simultaneous dyeing and anti-bacterial finishing on 100% cotton fabric: process establishment and characterization

AbstractNowadays, there is less emphasis on the aesthetic traits of textiles and more on their functionality. Traditionally functional textiles are prepared in two steps including dyeing and then finishing. This adds extra cost to the process through more energy consumption and water effluent. Current research deals with a single bath application of antibacterial finish with reactive dyeing. L-cysteine (L-cys) is a natural defensive thiolated amino acid found in many living organisms and is applied to cotton fabric through simple conventional reactive dyeing method. Fabrics with L-cys were assessed against both Escherichia Coli and Staphylococcus Aureus strains and promising results were found containing antibacterial activity up to 20 washes. The fastness properties of antimicrobial dyed fabrics were unaffected when compared with control samples. However, shade depth (k/s) was decreased with increasing amount of antibacterial agent while control samples showed highest value. This proposed process reduces chemical- and energy consumption, as well as water effluent. Graphical abstract

Comparison of Mechanical and Thermal Comfort Properties of Tencel Blended with Regenerated Fibers and Cotton Woven Fabrics

Abstract The demand of cotton is increasing but its low production rate cannot fulfill the world requirements. The increase in cotton demand has augmented the production of regenerated cellulosic fibers. Furthermore, cotton has proved to be unsustainable because of the use of huge amount of fresh water, pesticides and insecticides. The purpose of this work is to find out the suitable blend/blends of regenerated fibers so as to replace 100% cotton fabrics. Therefore, mechanical and comfort properties of Tencel fabrics blended with other regenerated cellulose fibers have been compared with 100% cotton to achieve the equivalent or even better end properties. Hence, cotton, viscose, Tencel, modal, and bamboo fibers were taken. Plain woven blended fabrics of 100% cotton and 50:50 blends of Tencel with other regenerated fibers were prepared from normal yarn count of 20 tex. The mechanical properties (warp-wise and weft-wise tensile and tear strengths, pilling, and abrasion resistance) and the comfort properties including air permeability, moisture management properties, and thermal resistance were evaluated. It is found that Tencel blended fabrics show better results than 100% cotton fabrics. Therefore, it is concluded that Tencel blended with these regenerated fabrics can be used to replace 100% cotton fabrics.