Effects of Air and Yarn Characteristics in Air-Jet Filling Insertion

Cotton fiber properties play an important role in determining spinning performance but explain only a portion of the variability in final yarn quality parameters. This research investigates relationships between ring-spun yarn quality and fiber properties (measured using the High Volume Instrument (HVI) and Advanced Fiber Information System (AFIS)) given additional information on harvest method and cultivar. Seventy-six samples of commercially grown cotton representing five cultivars from six locations across the Texas High Plains were collected over three years. Carded 14.5 tex (40 Ne) ring-spun yarns were produced and tested for various yarn quality characteristics. Principal component analysis and partial least squares regression were used to determine relationships between fiber and yarn properties. Neither harvest method nor cultivar explained a significant portion of yarn quality variability beyond that captured by HVI and AFIS results. Yarn work-to-break was highly correlated to fiber bundle elongation, which is not currently reported in official cotton classing reports.

Section: Resultsmentioning

confidence: 99%

Relationships of cotton fiber properties to ring-spun yarn quality on selected High Plains cottons

Faulkner

Héquet

Wanjura³

et al. 2012

“…Moreover, they found that to increase the velocity of the weft yarn the tension which restrains the yarn should be decreased. Turel et al 4 and Adanur and Turel 5 developed an air jet filling insertion simulator to analyze the effects of yarn and of air flow characteristics on the insertion time. They found that decreasing the mass of the weft yarn and increasing its hairiness decreased the insertion time.…”

mentioning

confidence: 99%

Simulation of air flow–yarn interaction inside the main nozzle of an air jet loom

Osman

Malengier

Meulemeester

et al. 2017

The main nozzle of an air jet loom plays an essential role in the weft insertion process. This role involves sucking the weft yarn from the prewinder and launching it into the reed. Simulating the dynamic behavior of the weft yarn inside the main nozzle involves fluid–structure interaction (FSI). In this work, one-way and two-way FSI simulations of air flow–yarn interaction inside a main nozzle have been performed. A three-dimensional model of the flexible weft yarn, consisting of a chain of line segments, and a two-dimensional axisymmetric model of the supersonic flow have been developed and coupled to perform these simulations. The results of the simulations are compared quantitatively and qualitatively with experimental results. Good agreement has been found between the results of the two-way FSI simulations and the experiment. The coupled fluid and structure models provide an effective numerical tool to optimize the geometry of the main nozzle based on the calculated motion and speed of the weft yarn.

“…In 1996, Adanur and Bakhtiyarov 2 developed a semi-open and corrugated weft insertion slot to measure the velocity of the airflow, and calculated the airflow friction coefficient as well as the yarn traction according to their experimental results. More recently, Turel et al 3 and Adanur and Turel 4 set up an emulator of the weft insertion system to analyze the effect of the loom operation speed, the supplied air pressure and the distance on the flow characteristics in the weft insertion channel. Substantial measurements of the weft insertion channel were made in this work.…”

mentioning

confidence: 99%

An investigation of some parameter effects on the internal flow characteristics in the main nozzle

Jin

Cui

Zhu

et al. 2016

The air-jet loom is widely used in the textile industry and the main nozzle is one of its key components. In this paper, the influence of some parameters, including the input air pressure and the structure of nozzle core and its internal diameter, on the internal flow field of the main nozzle is analyzed. Then the optimized structure of the main nozzle is proposed from the perspective of fluid dynamics. In the present simulations, the realizable [Formula: see text] model is applied to model the internal flow field of the main nozzle. The results show that the velocity in the annular throat reaches supersonic. Moreover, the pressure at the end of the nozzle core is the lowest in the main nozzle. It is also shown that the input air pressure has little effect on the axis velocity in Zone B, but on the other hand, has a great influence on the near-wall velocity field and the axis velocity in Zone C. In addition, an optimized structure of the nozzle core is proposed in this paper. It is found that with the proposed structure, the velocity boundary layer near the wall of Zone B in the accelerating tube can be well improved, and rapid diffusion of airflow in this area can be avoided. These help increase the moving speed of the weft yarn. Last but not least, we also show that decreasing of the internal diameter of the nozzle core improves the axis velocity of the weft accelerating tube. However, it brings a stronger turbulence at the same time.