This paper describes various illumination and image processing techniques for yarn characterization. Darkfield and back-lit illuminations are compared in terms of depth of field tolerance and image quality. Experiments show that back-lit illumination is superior in terms of depth of field tolerance and contrast. Three different back-lit illumination configurations are studied: one simply employ...

Abstract This study is about the influence of number wraps and overfeed ratio on fancy bouclé yarn structure. The yarns this were made a hollow-spindle spinning system. increased incrementally individually in two different experiments. It was found that there significant linear relationships between increasing size profiles, but at expense decreasing their circularity changing morphology. Howev...

As one of the most complex steps in fabric production, sizing plays a very important role in the weaving process. The primary purpose of the sizing process is to obtain the warp threads that can successfully be woven without major damages which occur during the yarn passage through sliding metal parts of the weaving machine (Lord, 2003). It applies to the improvement of physical and mechanical ...

Generally, ring spun yarns are manufactured from roving which is produced by frame. In this paper, an experiment has been done producing cotton yarn directly finisher drawn sliver eliminating the Total 3 types of with various linear density 8 Ne, 10 Ne & 12 were using a frame and without next step, physical mechanical properties those including unevenness, imperfections, hairiness tenacity inve...

Problem statement: The objective of this study is to compare the methods for approximating the positions of twist fiber in yarn structures. Computer Aided Design (CAD) is applied using parametric equation, spline curve and NURBS curve. The ideal twist fiber and fiber migration are studied in 3 dimensions. Approach: The fiber positions in yarn structures were measured by trace fiber technique. T...

In this paper, the ultraviolet protection factor (UPF) of plain knitted fabrics made from 20Ne cotton yarns, Coolmax yarn and their combinations in wet, relaxed and stretched states were studied. According to the fiber composition, fabric samples are divided into three groups including Group I (single cotton yarn), Group II (cotton/cotton combination) and Group III (Coolmax/cotton combination) ...

The kinetics of wicking of liquid droplets into yarns was studied by a computerized imaging system. A new method is suggested for characterization of the yarn structure by monitoring the droplet absorption. The method is based on the comparative analysis of the time needed for the droplet disappearance as a function of the droplet volume for various yarns. A mathematical model is developed for ...

Semi-combed yarn represents a type of ring-spun produced by modifying the typical carded and combed manufacturing process. Carded is inferior in quality, while yarns are not cost efficient. The semi-combed has therefore emerged as an alternative to fully facilitate reasonable quality-cost compromise. This paper reports two techniques associated features cotton same count. One process involves s...

Yarn tenacity is one of the most important properties in yarn production. This paper addresses modeling of yarn tenacity as well as optimally determining the amounts of the effective inputs to produce yarn with desired tenacity. The artificial neural network is used as a suitable structure for tenacity modeling of cotton yarn with 30 Ne. As the first step for modeling, the empirical data is col...

Globalization has profound effects on the texti le industry, including yarn production. These effects are not only evident in shifts in the geographical bases of production but also in the 'drivers' for manufacturing. This means that yarn producers are expected not only to produce higher quality yarns on much shorter lead times, but must also be competitive on prices i n order to survive. A mod...