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Mathematical planning of the experiment was used to develop a formulation for light stabilizers to improve the lightfastness of cotton knitwear coloration, dyed with active dyes, in order to produce comfortable and high-quality knitted clothes. The variance and factor analyses of the experiment's results were performed, which was carried out according to the scheme of the Latin cube of the first order involving the variation of factors - the type of light stabilizers and their concentration. The technological mode of application of light stabilizers implied the impregnation of knitted fabric, drying, and thermal fixation of the material. For the dyed knitwear samples, we have investigated the individual influence of light stabilizers on changing the color of the dyed knitted fabric and the kinetics of coloration photodegradation. The samples were insolated using the device with mercury-tungsten lamp RF 1201 BS ("REFOND", China). Following the treatment and insolation, the general color differences of knitwear samples were determined in comparison with the non-treated material, using the TCR-200 colorimeter ("PCE Instruments", Germany). The effectiveness of the developed formulation for light stabilizers was confirmed in the study of the lightfastness of knitted fabrics such as pique weave, 1+1 eraser, smooth surface, dyed with active dyes of the brand Bezaktiv ("CHT Bezema", Czech Republic). The result of our study is the developed formulation of light stabilizers consisting of 2,4-dihydroxy benzophenone, a UV-absorber, and hydroquinone, an antioxidant, at concentrations of 2 and 1 % of the material weight, respectively, which ensures an increase in the lightfastness of cotton knitwear coloration by 52.9-66.8 % regardless of weave and active dye. [ABSTRACT FROM AUTHOR]

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Purpose. The goal of the work is to determine the dependence of lightfastness of colours obtained by reactive dyes on the interlacing of cotton knitted fabrics. Methodology. The study was carried out using cotton knitted fabrics of various interlacing: plain, rib knitted fabric 1×1 and pique. Samples of knitted fabric were previously prepared by the combined method of washing and peroxide bleaching. Dyeing was carried out by reactive dyes brand Bezaktiv Cosmos periodically. The insolation of the dyed samples was carried out on a device with a mercury-tungsten lamp. The lightfastness of the samples was evaluated according to BS 1006 UK/TN standard by determining color differences at regular intervals using a colorimeter. Findings. The paper presents the results of a study of the effect of interlacing of cotton knitted fabric on the resistance of colours obtained by reactive dyes to light. It is established that the surface structure of knitted fabric affects the fading of colours with reactive dyes to varying degrees. It has been proven that a knitted fabric with a uniform smooth surface loses colour less under the action of light due to its ability to evenly distribute energy and reflect incident light compared to knitted fabrics with an uneven and rough surface. Based on the data obtained, the mechanism of the effect of light on knitted fabrics of various interlacing is given. Originality. The influence of the interlacing of cotton knitted fabric on the lightfastness of colours obtained by reactive dyes was studied. Practical value. According to the results of the study, interlacing of cotton knitted fabric were determined, which provide colours with reactive dyes with high resistance to light exposure, as well as interlacing, which require light-shielding treatment under the same conditions. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of KNUTD is the property of Kyiv National University of Technology & Design (KNUTD) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Purpose. The benefits of wool fiber scouring by applying the electro-bit non-linear volume cavitation in comparison with the standard technology are discussed. Findings. It is noted that the wool scouring using proposed technology provides a high-quality fiber with maximum storage stability and energy source saving. It is also shown that given technology allows to carry out more effective process of wool grease extraction from wool-washing water. Originality. First provided the application of a electro-bit non-linear volume cavitation in wool grease extraction technology. Practical value. The proposed wool treatment technology using EBNVC reduces the washing water consumption by 33.3% and detergents by 50%, which promotes reduction of negative impact of wool primary scouring factories on the environment. Wool grease accumulation only in one washing bath will enhance the efficiency of wool grease extraction. [ABSTRACT FROM AUTHOR]