MODULUS CHARACTERISTICS OF SPUN YARNS.

The yield point in stress-strain curves for yarn indicates the level of load after which permanent deformation occurs. In cotton yarns, the yield point is difficult to predict. Instead, the modulus-elongation curve based on tensile tests is a better indicator of performance. Modulus is a measure of the resistnace of a yarn to small extens..

HAIRINESS OF YARNS.

Both experimentation and mathematical models have been used to develop several yarn hairines theories. Instruments used to measure yarn hairiness include the Zweigle G 565 Hairiness Meter, the Uster Tester 3 Hairiness Meter Attachment, and the Shirley Yarn Hairiness Tester. Problems with the correlation of data between these instruments e..

Modulus Characteristics and Elastic Recovery Properties of Spun Yarns.

Modulus elongation curve obtained from measurements made with sophisticated tensile testing equipment inger the elastic recovery properties of spun yarns. Tensile testing shows that the highest modulus values are obtained for polyester yarns, followed by polyester blends and cotton ring and Rotor spun yarns. Cotton yarns can be strained u..

Blending Microfibers.

The development of devices to blend microfibers has dept pace with the development of microfibers. New blending nozzles, designed specifically to blend microfibers during spinning or texturing, are more widely available. A recent study of microfiber blending (using microfibers of between 0.3 and 1.0 dtex) shows that the combination of the..

Influence of Reeling Control System on Silk Thread Breakage.

An experiment texamined the frequency of thread breakage in an automatic silk reeling machine. Researchers used a statisticla queueing model to obtain a mathematicla distribution of the break frequency over time. The model expressed machine downtime as the sum to two independent variables associated with the exponential distribution of tw..

Yarns in Cross Section.

Research has indicated that variations in the cross sectional packing density of ring, rotor, and air jet blended yarns influence yarn properties. Blending of dissimilar fibers may not lead to their uniform distribution through a cross section, and particular fiber components may congregate either toward the core or the surface of the yar..

Electronically Controlled Take-off Creel GRM 08.

Herzog's GRM 08 is an electronically controlled take-off creel for use with such high technology fibers as carbon, glass, and aramid. Every take-off position is carefully controlled. Each thread is removed with a constant thread force and a constant thread velocity. A bobbin winding machine, which is electronically connected to the GRM 08..

Initial Assessment of Emissions from the Heat Setting of Carpet Yarn.

As part of a project to control toxic gas emissions during the heat setting of carpet yarn, researchers collected technical information from World Carpets in Daltion, Georgia (a manufacturer of tufted, knit, needle punched, felt, and braided carpet), and Diamond Mills in Rome, Georgia (a manufacturer of nylon, polypropylene, polyester, an..

Breakthrough in Fabric Quality Monitoring.

Heal's Sigmascope uses optoelectronics to measure to a high level of accuracy the number of yarns per unit length in woven fabrics, knit fabrics, wire mesh, grids, graticules, and other textiles. The instrument consists of a line scan camera capable of resolving yarn pitch frrom within a fraction of one yarn per centimenter to up to 100 y..

Multicolor Warp Yarn Dyeing and Sizing Machine.

Sucker + Mueller's multicolor warp dyeing and sizing plant produces colored denim warp yarns from Nm 8 to Nm 60. The plant comprises five to nine wetting, dyeing, fixing, and washing boxes with a warping capacity of 40 to 80 meters. A computerized system controls dye and size addition, which ensures optimum reproducibility of color intens..