Muhammed İbrahim Bahtiyari

Use of ultrasound in biopreparation and natural dyeing of cotton fabric in a single bath

Use of enzymes in different parts of textile finishing processes has become popular, and several enzymes have been introduced into the textile industry. This study aimed to carry out the whole fabric pretreatment process in a single bath containing different enzymes. Ultrasonic cavitation was also tested to show its effect on enzyme-based finishing of cotton fabric. After optimization of the enzyme-based ultrasound-aided finishing, the fabrics were also colored in the same bath using natural dyes of pomegranate peel, nutshell, orange tree leaf, and alkanet root. Finally, it was observed that ultrasound-aided biopreparation of cotton fabric could provide sufficient pretreatment results. Coloration of these fabrics could be achieved with the use of natural dyes in the same bath as biopreparation.

Ultrasound-assisted wool bleaching

Bleaching is a finishing process to whiten the gray fabrics. During this process it is important to ensure the demanded results with minimum fiber damage by considering environmental aspects. As a result of this, the study focused on the wool bleaching which is also an important process for the quality of wool products. It was managed with and without ultrasound and it was found that via ultrasound better bleaching results can be obtained in addition to improvement in contact angles related to the hydrophilicity. It is expected that with the addition of ultrasound to bleaching process, same results obtained with conventional bleaching will be reached with lower treatment temperatures or lower treatment time which is now essential for the protection of environment.

Effects of different pretreatment processes on viscose fabrics in different types and properties

Abstract In this study, the effects of different pretreatment processes on the properties of viscose fabrics (sulphur content, whiteness degree, weft yarn breaking force, crystallinity and fiber surface) and on the color efficiency and repeatability of the prints have been investigated. For this purpose, viscose fabrics obtained from different sources and containing different amounts of sulphur were causticized, bleached, and reductive-washed. After impregnation with urea, fabrics were printed with two reactive dyestuffs having the same reactivity, but different molecular sizes. Color values of both dyes were measured and fastness was tested and compared in order to observe the effects of different pretreatment processes. Different methods of sulphur analysis were also investigated and tested to determine the sulphur content of the fibres. Among these methods, the lead acetate method, which is a subjective evaluation system, has been selected as the most appropriate for practical working conditions of the plants, and a sulphur scale was formed according to this method. Accuracy of the scale was also confirmed by elemental analysis (CHNS–O) method.