ABSTRACT Alternative bleaching processes for cotton fabrics are presented in this study. The fabrics were pretreated with three different alternative methods which are termed here as cold bleaching process. These methods are ozone application alone (CP1), ozone-sodium persulfate application (CP2) and ozone-sodium perborate application (CP3). The results obtained from these cold bleaching processes were compared with the conventional pretreatment process (CP0) in terms of pretreatment efficiency, dyeability, and chemical/water/energy consumptions. It was found that the cold bleaching processes could be used as an alternative method for the pretreatment of cotton fabrics and the chemicals used in combination with ozone were important, as was ozonation duration. In addition to the evaluation of the pretreatment efficiencies, the differently pretreated samples were dyed with “madder” without using a mordant and without any previous extraction process, then the dyed fabrics were tested in terms of color yields (K/S), CIE L*a*b* color values, and washing/rubbing/light fastness properties. It was observed that the conventionally pretreated (CP0) samples exhibited higher color yields, darker shades. The fastnesses of the dyed samples were found nearly similar with the samples cold bleached and dyed. The chemical/water/energy consumptions during pretreatments were also compared for the different pretreatment processes and the benefits of cold bleaching processes come out from lower consumption of water, chemical and energy were illustrated. At the end of the study, the combination of ozone-sodium persulfate or ozone-sodium perborate were presented as alternatives for the purpose of cotton pretreatment.

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基于臭氧的冷漂工艺与传统棉花预处理的比较

摘要 本研究介绍了棉织物的替代漂白工艺。织物用三种不同的替代方法进行预处理，这里称为冷漂白工艺。这些方法是单独应用臭氧 (CP1)、应用臭氧-过硫酸钠 (CP2) 和应用臭氧-过硼酸钠 (CP3)。从这些冷漂白过程中获得的结果与传统的预处理过程 (CP0) 在预处理效率、可染性和化学品/水/能源消耗方面进行了比较。研究发现，冷漂白工艺可用作棉织物预处理的替代方法，与臭氧结合使用的化学品很重要，臭氧持续时间也很重要。除了评估预处理效率外，不同预处理的样品用“茜草”染色，不使用媒染剂，也没有任何先前的提取过程，然后测试染色织物的得色率 (K/S)、CIE L*a*b* 颜色值和洗涤/摩擦/耐光性。据观察，常规预处理 (CP0) 样品表现出更高的颜色产量，更深的色调。发现染色样品的牢度与冷漂白和染色的样品几乎相似。还比较了不同预处理工艺的预处理过程中的化学品/水/能源消耗，并说明了冷漂白工艺的好处来自较低的水、化学品和能源消耗。在研究结束时，