Effect Of Yarn Structure Research Articles

Effect of yarn structure, arrangement and surface on liquid moisture transfer in fabrics

The liquid moisture transfer property of three kinds of yarns, i.e. ring spun yarn, rotor spun yarn and vortex spun yarn and the corresponding fabrics constructed by each kind of yarns is investigated. Two-dimensional aligned-arranged yarns (namely, simulation fabric) is used to probe the effect of arrangement and surface of yarns on moisture management behavior. It is interesting to find that the moisture transfer capability of fabrics is not consistent with that of each kind of yarns forming the corresponding fabrics, but correlated with the hairiness value H of the yarns. Results also show that the hairiness and yarn arrangement are two key factors that cause the different wicking effect of the yarns and the fabrics. This work provides an insight into the moisture transport property of fabrics by comprehensively considering the structure, arrangement and surface effect of yarns.

Investigation into the effects of yarn structure and yarn count on different types of core-spun yarns

The scope of this research is to study the effect of yarn structure and yarn count on properties of types of core-spun yarns, including elastic core/T400, elastic core/Lycra, dual core, and tri-core yarns. Five types of yarn structures and three yarn counts were produced. Mechanical properties, yarn irregularity, imperfections, and hairiness were measured. Full-factorial analysis and Tukey tests were performed on the test results. It was concluded from factorial analysis that yarn count, yarn structure, and two-way interaction had a significant effect on yarn properties, except for yarn hairiness where the effect of yarn structure and two-way interaction was not significant. A Tukey pairwise comparison was used in this study to specify exactly the subgroups of yarn count and yarn structure that have a significant mean difference. The scanning electron microscopy (SEM) images of the dual-core yarns and tri-core yarns were performed to illustrate the structure of these yarns.

Effect of yarn structure on wicking and its impact on bloodstain pattern analysis (BPA) on woven cotton fabrics

Bloodstain pattern analysis (BPA) of bloodstains on hard, non-porous surfaces has found widespread use in crime scene analysis and reconstruction for violent crimes in which bloodshed occurs. At many violent crime scenes, bloody clothing is also found and may be analyzed. However, to date, there are no definitive methods for analyzing bloodstains on textiles, even for simple drip stains. There are two major classes of textiles used for apparel and household textiles, weaves and knits. In this article, drip stains on two 100% cotton plain weave fabrics representative of bed sheets are analyzed. Since it is common practice in the manufacture of bed sheeting to use different types of yarn in the warp and weft direction to reduce cost, custom weaves were made from yarns produced by each of the three most common staple yarn production techniques to control this variable. It was found that porcine blood wicked into the fabrics made with ring spun yarn, but not into those made with open end or vortex spun yarns. The uneven wicking of blood into the different yarns resulted in elliptical-shaped stains on commercial bed sheeting that can be misleading when performing bloodstain pattern interpretation based on the stain morphology. This surprising result demonstrates that it is not sufficient to analyze the structure of the fabric, but one must also characterize the yarns from which the fabric is made. This study highlights the importance of a deeper characterization of the textile structure, even down to the yarn level, for BPA on textiles.

Effect of Yarn Structure on Mechanical Properties of Twisted Yarn Composites

T wisted yarns are used for bio-composites and nanocomposites as reinforcement . In a twisted yarn, single yarns migrate from surface to inner along the yarn axis. In this research , migration structure is studied by using X-ray CT system . The result is obtained that the orientation angle correlates with layer .

Effect of Yarn Structure on Mechanical Properties of Natural Fiber Twisted Yarns and Green Composites Reinforced with the Twisted Yarn

Natural fiber twisted yarn has high potential as a reinforcement of green composites, because the yarn is produced as a continuous form, which is necessary for exhibiting reinforcing mechanism in a composite. In a twisted yarn, spun yarn filaments meander from the twisted yarn surface to inner along the yarn axis. This phenomenon is called ‘migration’, and yarn structural mechanics has been developed by taking an ideal migration into consideration. In the yarn mechanics, yarn tensile properties are often expressed as a function of twist angle, while yarn structure depends strongly on performance of twisting machine. Thus, the present study deals with the effect of twist contraction ratio (TCR), one of the most important parameters in yarn structure, on tensile properties of twisted yarns and green composite reinforced with twisted yarn. Ramie spun yarn filaments were used as a test material, and the twisted yarn were produced using auto or hand twisting machine. The results show that relation between mechanical properties of the twisted yarn and yarn structure can reasonably be comprehended when choosing TCR as an evaluation parameter. Furthermore, this study additionally deals with relation between theoretical elastic modulus, and twist angle or TCR based on the experimental data of green composites as well as twisted yarns.

Hand Analysis of Polyester Fabric with High-Shrinkage Fibers by KES Objective Evaluation Method

In order to get more wool-like polyester weave in the point of fabric hand, the best design of polyester weave with high-shrinkage fibers was investigated using variance analysis in orthogonal array. The effect of yarn structure and yarn density were inspected. 16 fabrics of 2/2-twill gaberdine were produced and their mechanical properties were measured using KES-FB system. Primary hand values and total hand value (THV) were calculated by conversion equations developed by Kawabata and Niwa. It was shown that THV became the highest when the high-shrinkage polyester fibers were used as weft yarns with high density and regular polyester fibers were used as warp yarns with low density. It was proved that wool-like fabric hand could be achieved by polyester weave using adequate combination of high-shrinkage polyester fibers. The subjective evaluations of fabric quality in the point of THV by experts in laboratory and factory at Shanghai did not agree with each other, but the evaluations by consumers at Shanghai agreed well with those by Japanese experts.