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Lyocell Fabric Dyed with Natural Dye Extracted from Marigold Flower Using Metallic Salts

Rashdi Sayed Yaseen, Naveed Tayyab, Sanbhal Noor, Almani Sikandar, Lin Peng, Wei Wang

Autex Research Journal

2020

Vol. 20, no. 3

352--358

The application of natural dyes is increasing each year due to their environmental friendliness and easy application on cellulose fibers. In this study, the natural dye from the Mexican marigold flower was extracted using a Soxhlet extraction apparatus. The extracted natural dye was applied on lyocell fabric with five different metallic salts using pre-mordanting and post-mordanting methods. It was observed that different color shade depth was achieved with different fixing agents. The color shade depth (K/S) washing fastness, light fastness, rubbing fastness, perspiration, and Fourier transform infrared (FTIR) test results of all dyed samples were excellent in both pre- and post-mordanting methods. There was no significant difference in the results between post- and pre-mordanting fixation methods. However, the results showed that mordant ferrous sulfate had higher K/S value as compared to all other mordants. The dye extracted from marigold flower showed good dyeing efficiency with mordant to excellent colorfastness tests. FTIR results showed that there was no structural change in lyocell fabrics, before and after dyeing processes. Thus, a natural dye extracted from marigold flower has shown good colorfastness properties without damaging its fiber structure.

Effects of Optimal Mordanting on the Bleaching and Spinning of Black Yak Fibres

Liu C., Su X., Xie C., Liu X.

Fibres & Textiles in Eastern Europe

2017

Vol. 25, no. 5 (125)

31--36

In this paper, the orthogonal analysis method was adopted to analyse the optimal mordanting condition for the bleaching of black yak fibres. Without changing the subsequent oxidative/reducing bleaching technology, the optimal mordanting condition was as follows: per weight of water, the ferrous ion concentration is 16%, the sodium bisulfate concentration 3 g/l, the mordanting temperature 60 °C and the liquor pH value is 2. Based on the optimal mordanting condition, yak fibres were bleached. The properties of bleached and untreated yak fibres and yarns were tested by a fibre tensile tester, scanning electron microscopy, yarn strength tester, USTER Tester 5 and so on. By comparing the properties of untreated and bleached yak fibres and yarns, the effects of optimal mordanting on the bleaching and spinning of black yak fibres were presented. The results show that bleached yak fibres have poorer mechanical and morphology properties, and it is harder to felt for bleached fibres. For the spinning of 16.7 tex yarn, a complete condensing spinning system was adopted, and the performances of bleached fibre yarn decreased in the permissible range compared with the untreated fibre yarn.

W celu określenia optymalnych warunków procesu zaprawiania włókien z wełny jaków zastosowano metodę analizy ortogonalnej. Określono optymalne parametry procesu zaprawiania tj.: stężenie jonu żelazawego na poziomie 16%, stężenie wodorosiarczanu sodu w ilości 3 g/l, temperaturę na poziomie 60 °C, a wartość pH roztworu na poziomie 2. Następnie włókna poddano procesowi bielenia. Oceniono właściwości mechaniczne włókien oraz dokonano analizy powierzchni włókien za pomocą SEM. Wyniki wykazały, że włókna poddane procesowi bielenia mają słabsze właściwości mechaniczne i morfologiczne. Do wytworzenia przędzy 16,7 tex zastosowano kompletny system przędzenia, a wydajność przędzenia przędzy bielonej zmniejszyła się w dopuszczalnym zakresie w porównaniu z przędzą nie poddaną obróbce.