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Włókna celulozowe typu Lyocell

Śmiechowicz Emilia

Przegląd Włókienniczy - Włókno, Odzież, Skóra

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2023

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nr 3

28--31

PL

Niniejszy artykuł stanowi przegląd literatury dotyczącej otrzymywania sztucznych włókien celulozowych typu Lyocell. Zarówno technologia otrzymywania włókien Lyocell, jak i włókna Lyocell same w sobie, stanowią alternatywę dla technologii produkcji włókien wiskozowych. Ekologiczna metoda produkcji włókien sposobem NMMO oraz wiele pozytywnych właściwości włókien celulozowych typu Lyocell, jak również możliwość ich modyfikacji i uzyskiwania włókien funkcjonalnych stwarzają potrzebę głębszego zainteresowania tą tematyką. Aspekty związane z pochodzeniem surowcowym włókien Lyocell, technologią ich otrzymywania, właściwościami włókien w porównaniu z innymi włóknami dostępnymi na rynku zostaną omówione w niniejszym artykule.

EN

This article is a literature review on the preparation of artificial cellulose fibers of the Lyocell type. Both the technology of obtaining Lyocell fibers and Lyocell fibers themselves are an alternative to the production technology of viscose fibers. The ecological method of fiber production using the NMMO method and the many positive properties of Lyocell cellulose fibers, as well as the possibility of their modification and obtaining functional fibers, create the need for a deeper interest in this subject. Aspects related to the raw material origin of Lyocell fibers, the technology of their spinning, fiber properties compared to other fibers available on the market will be discussed in this article.

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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

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2020

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Vol. 20, no. 3

352--358

EN

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.

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Salt-free dyeing – a new method of dyeing on Lyocell/cotton blended fabrics with reactive dyes

Periyasamy A. P., Dhurai B., Thangamani K.

Autex Research Journal

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2011

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Vol. 11, no. 1

14--17

EN

Cellulosic/regenerated blended fabrics dyed with reactive dyes require a large amount of salt, which pollutes fresh watercourses. Due to the hydrolysis of the dye, the dyeing effluent consists of a large amount of hydrolysed dye, and it requires a high volume of water to remove the hydrolysed dye in a wash-off process. Lyocell/cotton fabrics were dyed with reactive dyes using conventional methods and pretreating the fabric with polyvinylamine chloride (at five different concentrations). Pretreated samples were dyed without using salt as an electrolyte. The influence of pretreatment on K/S value, wash fastness, rubbing fastness, tensile strength, flexural rigidity and crease recovery were determined. It was found that pretreatment of Lyocell/cotton fabrics with polyvinylamine chloride increases dye uptake and shows good wash fastness and rubbing fastness. There was a slight increase in crease recovery angle and flexural rigidity in the pretreated sample. It was determined that polyvinylamine chloride was found to be effective for pretreatment in salt-free dyeing of Lyocell/cotton fabrics.

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Imparting protective properties to Lyocell via finishing treatments

Ajoy K., Vora S., Vora G.

Autex Research Journal

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2011

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Vol. 11, no. 3

89--92

EN

Lyocell fabric was analysed for its protective properties against UV radiation and disease-causing microbes. Unfinished lyocell fabric afforded no protection against UV radiation and also possessed no antimicrobial activity against the two microbes investigated in this study. To improve its protective properties, lyocell was finished with a UV absorber. To enhance its antimicrobial properties, lyocell was treated with an antimicrobial agent. It was experimentally determined that an optimum UV absorber concentration of 2% of the weight of the fabric was sufficient to improve the UV properties of lyocell fabric to an excellent degree. The optimum antimicrobial concentration for excellent antimicrobial activity was found to be 0.5% of the weight of the fabric. Subsequently, lyocell fabric was finished with the optimum amount of UV absorber and antimicrobial agent in a combined multi-functional bath. The data showed that the UV protection of lyocell fabric was not negatively affected when a multi-functional bath was employed. Similarly, the antimicrobial efficiency was not reduced by multi-functional finishing treatment. Further, the finishing treatments, whether applied singly or in a multi-functional bath, were durable to laundering and to light exposure.

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Novel cellulose nanofibers based on the lyocell technology

Kulpinski P.J.

Polish Journal of Chemical Technology

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2006

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Vol. 8, nr 3

64-66

EN

N-methylmorpholine-N-oxide (NMMO) is well-known as a direct solvent of cellulose. NMMO is used to produce cellulose fibres which are known as Lyocell fibres. The recent studies on NMMO processing showed that the NMMO method is also suitable for obtaining cellulose nanofibres. All data and the information provided in this paper concerned the cellulose nanofibers spinning method and nanofibers characteristics was worked out in the Man-Made Fibres Department of Technical University of Lodz.