Browsing by Author "Asad Ali Nasir"

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    Comparative study of color uniformity of polyester and nylon knitted fabric in IR dyeing machine and conventional method
    (UMT Lahore, 2025-08-22) Asad Ali Nasir; Ahsen Aftab Ansari
    This research is focused on the comparative analysis of dying machines, to analyze their dyeing efficiency, heating efficiency and energy consumption. The comparison was analyzed between infrared (IR) dying machine and the normal exhaust machine high temperature (HT) dying machine. To determine which machine can produce more unifying and efficient dyeing, we used two types of fabric, polyester and nylon. Polyester and nylon were used because they are synthetic and require high temperature for dyeing, so it is difficult to dye in the normal exhaust process. We dyed samples of nylon and polyester with the same dye liquor composition, in IR dyeing machine and HT dyeing machine at sample parameters, 90 degrees Celsius, for 60 minutes. Then all the samples were hot washed and dried. Then we analyzed these samples by visual assessment of uniformity of dyeing and shade, by using results from spectrophotometer, by using K/S values, washing fastness rating and rubbing fastness rating. All these results helped us to determine which dyeing machine dyed samples with more dye concentration and high fixation rate with low surface dyeing. By analyzing the uniformity of dyeing we also determined which machine’s heating system was more homogenized than the other. This all helped in determining the most efficient dyeing machine between HT dyeing machine and IR dyeing machine.