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Ag Coated Pa-Based Electro-Conductive Knitted Fabrics for Heat Generation in Compression Supports

Repon Md. Reazuddin, Mikučionienė Daiva, Baltina Ilze, Blūms Juris, Laureckiene Ginta

Autex Research Journal

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2022

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Vol. 22, no. 1

55--63

EN

This work deals with the electrically conductive textiles for heat generation in orthopedic compression supports. This study aimed to develop compression knitted structures with integrated electro-conductive yarns and investigate their heat generation characteristics and temperature changes during the time and under stretch which is required to generate compression. Combined half-Milano rib structured knitted fabrics were made by using silver (Ag) coated PA yarn of linear density of 66 tex and 235 tex, respectively. Six variants of specimens were developed by using different amount of electro-conductive yarns in a pattern repeat. It was found that stretch negatively influences temperature values as well as time in which the required temperature is reached. Therefore, the final wearing conditions have to be summed up during the designing of compression orthopedic heated supports.

2

Comparative Analysis of Peat Fibre Properties and Peat Fibre-Based Knits Flammability

Mikucioniene Daiva, Cepukone Lina, Salmeia Khalifah A., Gaan Sabyasachi

Autex Research Journal

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2019

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Vol. 19, no. 2

157--164

EN

A very promising cellulose-based natural fibre that is suitable for use in the textile industry is peat fibre. This fibre is a by-product of peat excavation, purified by separating it from other components. In this study, the morphological, chemical and mechanical properties of peat fibres as well as flammability of peat-based knitted fabrics were analysed. The average diameter of the peat fibres is ~60 μm, but it varies in very wide ranges – 25–150 μm; however, the number of fibres with diameter more than 100 μm is very low. As the peat fibre contains a high amount of lignin, lignin amount in the mixed peat/cotton yarn is relatively high too. Lignin is responsible for enhanced flame retardancy; therefore, time to ignition of the peat knit is ~30% higher than that of the cotton knit. Consequently, peat fibre can be used in the knitted structure in order to significantly reduce its flammability. In order to increase the flame retardancy, the knits have been treated by flame retardant in various concentrations. It was found that around the burned hole on the peat knit, treated by very low concentration flame retardant, forms charred area and the knit stops to burn even if the flame source is not removed.

3

Comparative Analysis of Knits from Peat Fibre and its Combinations with Other Natural Fibres

Mikučioniené D., Čepukonė L.

Fibres & Textiles in Eastern Europe

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2017

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Vol. 25, no. 2 (122)

24--29

EN

Natural and man-made fibres of natural origin are more and more widely used, while consideration of sustainability is constantly increasing. The properties and processing behaviour of newly introduced fibres of natural origin are usually compared and often predicted on the basis of widely investigated fibres; however, this prediction sometimes does not have any confirmed basis. Structural parameters and the majority of mechanical and physical properties of knitted fabrics depend on technical characteristics of the knitting machine, on the properties of yarns as well as on the origin of the raw material. This study attempts to develop knits from new natural peat fibres and their combination with widely used woollen, cotton and elastomeric Lycra yarns and to investigate the influence of peat fibre’s nature on structural parameters such as loop length, wale and course spacing, area density, the tightness factor and on main physical properties such as dimensional stability, air permeability and water adsorption.

PL

Włókna naturalne i sztuczne pochodzenia naturalnego są coraz szerzej stosowane. Właściwości i sposób przetwarzania nowych włókien pochodzenia naturalnego są często przewidywane na podstawie dobrze znanych włókien, jednak ta prognoza czasami nie ma żadnych potwierdzonych podstaw. Parametry strukturalne i większość właściwości mechanicznych i fizycznych dzianin zależą od właściwości technicznych maszyn dziewiarskich i właściwości przędzy, a także od pochodzenia surowca. W pracy podjęto próbę otrzymania dzianin z włókien torfowych i ich kombinacji z wełną, bawełną i Lycrą. Badano wpływ włókna torfowego na parametry strukturalne, takie jak: długość nitki w oczku, ścisłość kolumienkową i rządkową, ścisłość, stabilność wymiarów, przepuszczalność powietrza i adsorpcję wody.

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Investigation of porosity and air permeability values of plain knitted fabrics

Ogulata R. T., Mavruz S.

Fibres & Textiles in Eastern Europe

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2010

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Vol. 18, no. 5 (82)

71--75

EN

The air permeability of a fabric is defined as the amount of air passed over a surface under a certain pressure difference in a unit time. This value has significance with respect to the usage area. Since knitted fabrics have a loop structure, they have more pores than woven fabrics; therefore, in general, the air permeability of knitted fabrics is higher than that of woven fabrics of the same weight. An experiment to determine the air permeability is very important as it defines the properties of keeping warm, protection against the wind, breathability etc. of knitted fabrics used as clothing. In this study, it has been attempted to establish a theoretical model for the porosity and predicted air permeability of plain knitted fabrics. A theoretical model was created to predict the porosity and air permeability of a knitted structure depending on the geometrical parameters, such as the courses per cm, wales per cm, stitch length, fabric thickness, yarn count, diameter of yarn and fiber density. For this purpose, a theoretical model of porous systems based on D’Arcy’s law was used, the validity of which was confirmed by experimental results using 100% cotton plain knitted fabrics produced from ring and compact yarns of different yarn number linear density and tightness.

PL

Dzianiny mają więcej porów w swojej strukturze niż tkaniny, dlatego też przepuszczalność powierza dzianin jest wyższa niż tkanin o tej samej masie powierzchniowej. Wyznaczanie przepuszczalności powietrza jest bardzo ważne dla określenia właściwości, takich jak zatrzymywanie ciepła, ochrona przed wiatrem. W opisanych badaniach stworzono oparty na prawie Darcy’ego model teoretyczny, który umożliwia przewidywanie porowatości i przepuszczalności powietrza dzianin w zależności od parametrów geometrycznych, jak ilość rządków/cm, ilość kolumienek/cm, długość oczka, grubość dzianiny, masa liniowa, średnica przędzy, gęstość.