Characterization of Low Twist Yarn: Effect of Twist on Physical and Mechanical Properties

ABSTRAC

Thermal comfort properties of weft knitted quilted fabrics

MARMARALI, ARZU/0000-0001-6251-0645; Abbasi, Sadaf/0000-0001-8257-8399WOS: 000530321100001Purpose This paper investigates the thermal comfort properties of quilted (jersey cord) fabrics produced with different width of diamond pattern, different filling yarn linear density and different types of material. Design/methodology/approach A total of 12 fabrics were knitted by varying the width of diamond pattern (1 and 3 cm), the filling yarn linear density (300 and 900 denier) and the type of materials (cotton, polyester and their combination). in this regard, air permeability, thermal conductivity, thermal resistance, thermal absorptivity and relative water vapor permeability of these fabrics were measured and evaluated statistically. Findings the results showed that fabrics knitted using cotton yarn in both front and back surfaces exhibit higher thermal conductivity, thermal absorptivity and relative water vapor permeability characteristics; whereas samples knitted using polyester yarn in both surfaces have higher air permeability and thermal resistance. As the linear density of filling yarn increases, thickness and thermal resistance of the samples increase and air permeability, thermal conductivity, water vapor permeability characteristics decrease. When the effect of the width of diamond pattern compared, it is seen that an increase in the width of pattern lead to an increase in thickness and thermal resistance and a decrease in thermal conductivity, thermal absorptivity and water vapor permeability values. Originality/value Many researches were carried out on the thermal comfort properties of knitted fabrics, however there is a lack of research efforts regarding thermal comfort properties of quilted fabrics.Ege University Scientific Research Project OfficeEge University [14-MUH-070]This work was financially supported by Ege University Scientific Research Project Office [grant number 14-MUH-070]. the authors also would like to thank UNITEKS for the production of the fabrics

Shear Deformation of 3D Carbon Woven Fabrics

This study was to analyze the mechanism of shear deformation and yarn slippage in the 3D (Three Dimensional) carbon woven fabric. For this study three weaves orthogonal, layer to layer and angle interlock were tested in Kawabata shearing instrument and all the results were analyzed. The relationship between the shear load and shear angle was measured in both warp and weft directions. It is shown that the fabric having highly compact structure exhibits high shear rigidity and it can withstand high shearing load. The orthogonal weave has shown much higher shear rigidity as compared to other weave structure

Shear Deformation of 3D Glass Woven Fabrics

Much less has been done on failure characteristics of 3D (Three Dimensional) woven fabrics. This work is to attempt to this need. Shear behavior is key characteristic and play direct role to the performance of woven fabrics. In this study, three different 3D weave structures have been used to analyze the fabric shear rigidity. Shear analysis has been carried out in both directions using Kawabata evaluating system. Based on the results, a relationship of shear rigidity (G) and shear hysteresis are compared and analyzed in zero and 90o direction of fabric

Characterization of Low Twist Yarn: Part-I Effect of Blend Ratio (Polyester/Cotton)

The present study was conducted to determine the impact of PE/CT (Polyester/Cotton) blend ratio on the low twist yarn properties. A range of yarn count with similar low twist was spun on ring machine with 70/ 30 and 30/ 70 PE/CT blend ratios. The yarn properties such as evenness, hairiness and strength were studied. It was observed that single end yarn and skein strength, elongation and hairiness were directly proportional to the ratio of polyester fibre in the blend. It was revealed from the experimental findings that the evenness and strength improved with an increase of proportion of polyester fibre. They also increased with increasing yarn count

Characterization of Low Twist Yarn: Effect of Twist on Physical and Mechanical Properties

The amount of twist plays vital role for finished consumers\' good which determines appearance, durability and serviceability of fabric. In this research, yarns made of four twists (170, 190, 210 and 230 tpm (turns per meter) were investigated in order to determine the effect of twist on physical and mechanical properties of low twist yarn. The yarn properties: tenacity, breaking force, elongation, mass variation, hairiness in the yarn were studied. Three counts (30, 40 and 50 tex) were manufactured with various twist levels. It was observed that the strength of yarn was affected with an increase of the twist and count. The yarn manufactured with 230 tpm and 50 tex count shows better yarn strength as compared with other twist levels and yarn counts. Further, it was found that reduction in twist improves the evenness of yarn