Hüseyin Kadoğlu

Thermal Comfort Properties of Angora Rabbit/Cotton Fiber Blended Knitted Fabrics:

In this study, thermal properties of different cotton and Angora rabbit fiber blended fabrics were investigated. It is known that cotton fiber has good comfort properties and Angora rabbit fiber is a speciality fur fiber which possesses good softness, whiteness and warmth. The aim of this study was to combine the excellent characteristics of these fibers to produce knitted fabrics with better comfort properties. First, short staple yarns were spun from cotton and Angora rabbit fibers with different blend ratios in two different spinning systems. Then, 1 × 1 rib knitted fabrics were produced with these yarns and the thermal comfort parameters of fabrics were measured on Alambeta and Permetest devices. Finally, according to end use, the optimum ratios were analyzed. The results indicated that the increase of Angora fiber ratio in the fabric and the spinning system affected the thermal comfort properties. The statistical analyses showed that only the fabrics including 25 % of rabbit fiber generated a significant difference on these parameters. Besides, the fabrics knitted from ring yarns had a warmer feeling at first touch and provided more thermal insulation but less water vapor permeability than the fabrics knitted from open-end yarns.

Regressional Estimation of Ring Cotton Yarn Properties from HVI Fiber Properties

The main aim of the present study was to predict the most important yarn quality characteristics derived from cotton fiber properties that were measured by means of an HVI system. With this aim 15 different cotton blends were selected from different spinning mills in Turkey. The cotton fibers were processed in the short staple spinning line at Ege University Textile and Apparel Research-Application Center and were spun into ring yarns (20s, 25s, 30s and 35s). Each count was spun at three different coefficients of twist (αe 3.8, αe 4.2 and αe 4.6). Linear multiple regression methods were used for the estimation of yarn quality characteristics. Yarn count, twist and roving properties all had considerable effects on the yarn properties and therefore these parameters were also selected as predictors. After the goodness of fit statistics very large R 2 (coefficient of multiple determination) and adjusted R 2 values were observed. Furthermore, analysis of variance tables showed that our equations were significant at the α = 0.01 significance level.

Electromagnetic shielding characterization of conductive woven fabrics produced with silver-containing yarns:

This paper presents a study of the electromagnetic shielding characterization of woven fabrics, produced with two different types of conductive yarns, namely silver-containing (Ag/PA/Co) core yarns and silver-containing (Ag/PA-Co) blended yarns. The effect of various yarn and fabric properties, such as yarn count, core filament count, blend ratio, weft density, electrical resistivity, yarn type and wave frequency, on the electromagnetic shielding effectiveness was investigated. The results have shown that the shielding effectiveness can be tailored by changing the yarn and fabric parameters and also there are significant differences between the electromagnetic shielding characteristics and performances of the fabrics produced with different yarn groups. Such fabrics are future promising for both daily and professional uses, since they combine high shielding effectiveness performance and the comfort properties of conventional fabrics.

Regressional Estimation of Cotton Sirospun Yarn Properties from Fibre Properties

Abstract In this paper, it is aimed at determining the equations and models for estimating the sirospun yarn quality characteristics from the yarn production parameters and cotton fibre properties, which are focused on fibre bundle measurements represented by HVI (high volume instrument). For this purpose, a total of 270 sirospun yarn samples were produced on the same ring spinning machine under the same conditions at Ege University, by using 11 different cotton blends and three different strand spacing settings, in four different yarn counts and in three different twist coefficients. The sirospun yarn and cotton fibre property interactions were investigated by correlation analysis. For the prediction of yarn quality characteristics, multivariate linear regression methods were performed. As a result of the study, equations were generated for the prediction of yarn tenacity, breaking elongation, unevenness and hairiness by using fibre and yarn properties. After the goodness of fit statistics, very large determination coefficients (R2 and adjusted R2) were observed.

Electromagnetic Shielding Effectiveness of Conductive Knitted Fabrics

Electromagnetic Shielding Effectiveness of Conductive Knitted Fabrics Electromagnetic waves are known to have harmful effects on human health. The aim of this project is to investigate the application of knitted textile materials for the purpose of protection against electromagnetic waves and the effect of raw material, yarn and fabric parameters on electromagnetic shielding properties extensively. To obtain conductive textile surfaces, copper and silver filaments were used with cotton by using an apparatus on ring spinning machine.By using conductive yarns single jersey, rib, and futter (2 threads) knitted fabrics were produced. Cotton fabrics were also produced for comparison.

Properties of elastic fabrics with treated and untreated Co/PBT yarns in weft direction

Studies in the field of elasticised woven fabrics made of Co/PBT yarns indicate great potential of PBT use in woven fabrics. Weaving experiments demonstrate that elasticity of Co/PBT fabrics gained after treatment depends not only on woven fabric settings but also on on-loom settings. Therefore, it is difficult to predict precisely the degree of shrinkage of the Co/PBT fabric after treatment. Six samples of woven fabrics were produced, three samples with the pretreated core spun Co/PBT weft, each in a different weave. Other three samples were woven with untreated core spun Co/PBT weft, in the same weaves and afterwards the samples were treated. The results indicated big differences between samples with pre-treated Co/PBT yarns in weft direction and samples treated after weaving.

Investigation of the Characteristics of Elasticised Woven Fabric by Using PBT Filament Yarns

Abstract Owing to growing demand for comfortable clothes, elastane filament yarns are being used in fabrics for several garments. In this study, core spun yarns were produced with cotton fibres and PBT/elastane filament yarns (cotton as sheath material, PBT yarn and elastane as core yarns). Twill woven (1/3 Z) fabrics were produced by using core spun yarns (30 tex) and cotton yarns (30 tex) as weft, and 100% cotton yarn (59 tex) as warp yarns. The fabrics consisting of PBT were washed at 100°C for 30 minutes to gain the elasticity. The woven fabrics’ weight, thickness, elongation, permanent elongation, dimensional stability, air permeability, thermal conductivity, thermal absorptivity characteristics were tested and statistically evaluated. According to the results, the fabrics containing PBT and elastane filaments had similar elongation and shrinkage values. PBT filament yarns have a great potential to produce lightweight elastic fabrics.