Scientific and Engineering Principles in Twist-Texturing

An overview of the development of yarn texturing addresses heat setting, fiber structure, thermal transitions, dynamic mechanical analysis, temporary set, crystallization, annealing, melting, steam setting, fiber extension, fiber bending, fiber twisting, fiber surface properties, false twist, friction twisting, slipping mode, positive mod..

Failure Mechanism in Staple Yarns.

Yarn structure influences the failure mechanism in staple yarns. Manufacturing methods impose certain constraints on the disposition and distribution of fibers in the yarn cross section. Researchers investigated the failure mechanism in ring, rotor, air jet, and vortex spun yarns. An experiment subjected the yarns to uniaxial loading on a..

A Comparative Study of MTS and Equivalent MURA JET SPUN Yarns.

Researchers compared the hand, tenacity, breaking extension, and flexural rigidity of fabrics knit from Murata twist spun and Murata jet spun polyester/viscose yarns. Doubling increased the tenacity, breaking extension, and flexural rigidity of both yarns. The increase in tenacity, breaking extension, and flexural rigidity was greater in ..

High-Function Textiles.

High performance yarns offer consumers comfort, convenience, and safety. Asahi Kasei Corporation's Roica spandex yarns offer chlorine resistance, high elongation, setability, moisture absorption, and deodorizing properties. Kurabo Industries Limited's Spinair yarn with a hollow core and cotton sheath imparts a soft hand to flat and circul..

Dynamics of Starting Up and Slowing Down Pneumatically Transported Yarn -- The Yarn Stary-Up.

Researchers studied such yarn motion parameters as resistance to motion, yarn linear mass, and air jet mean velocity during yarn transport and such yarn startup parameters as time of transport, velocities, yarn acceleration, and yarn dynamic load. Increased air velocity decreased yarn transport time, whereas changes in yarn linear mass di..

Impact of Downstream Process Developments.

An overview of the effects of developments in downstream technology on yarn manufacture addresses warp yarn preparation, looms, knitting machines, dyeing machines, finishing machines, and environmental issues. The acceleration of fabric manufacturing processes has increased the importance of yarn preparation. Faster loom speeds and the in..

Influence of Twist on Properties of Flat Yarn.

Researchers evaluated the effects of twist on flat polyester yarn properties. Increasing twist increased yarn denier and yarn contraction percentage. The tenacity of four of five yarn samples increased as twist per meter increased up to 1,600 twists per meter and then decreased above 1,600 twists per meter. Yarns with fewer filaments show..

Com4 Conquers the Market.

The ComforSpin process improves yarn quality and production speeds. Rieter Machine Works Limited's COM4 yarn features low hairiness and high strength and elongation, provides wearer comfort, and is environmentally friendly. The ComforSpin process condenses the fibers, gathers them in parallel lines in the compacting zone prior to yarn for..

Compact Spun Yarn -- Technology & Characteristics.

An introduction to compact spun yarns technology addresses system design, Rieter's COM4 system, Suessen's EliTe system, and properties of compact spun yarns. Compact spinning, a development of conventional ring spinning technology, is based on a patent for separating a fiber mass into two indentical strands via air suction. The drafting s..

Qualitative Assessment of Impact of Power Quality on Yarn characteristics.

Frequency variations, total harmonic distortion, voltage imbalance, sinusoidality, and other power supply quality parameters affect yarn quality. Variations in power supply parameters affect drafting speed, spindle speed, and balloon size. Changes in drafting speed alter drafting forces, which affect fiber migration in the drafting zone. ..