INTRODUCTION TO TEXTILE TECHNOLOGY. PART 2. YARN MANUFACTURING -- SPUN YARNS.

A general review of such spinning systems as ring, open-end, air-jet, wrap-spinning, fasciated, self-twist, and twistless, focuses on new technologies to increase productivity and improve the quality of yarn.

PROCEESSING OF LOW-GRADE COTTON WITH AUTOMATED PREPARATORY AND CARDING SYSTEMS.

The processing of low-grade cotton at two different mills is examined. Different fiber blends and machine parameters are compared.

SPINNING DEFECT-FREE COTTON YARN -- THE DREAM BECOMES REALITY.

Defects in fibers are the major causes of inferior cotton yarns. Bundles of short and immature fibers contribute to the flaws in cotton yarns. Manual ginning achieves virtually defect-free cotton yarns. During processing, a distinction must be made between individual short fibers and the bunches of short fibers that cause yarn defects. In..

PRODUCTION OF SHAPED YARN ON SPINNING AND TWISTING MACHINES.

The operation of a spinning and twisting machine producing a shaped linen yarn is described. This yarn is composed of segments of roving attached between two threads with a low-grade linen fiber used as the base. A programmable device assures the distribution of diverse effects on the yarn, such as color and twist. The shaped yarn has a n..

YARNCON 1989 -- SPINNING INTO THE FUTURE.

Just-in-Time systems, automation, and the linking of processing stages are imperative to further improvements in semi-worsted spinning. The latest version of the Mackie System uses a finisher chaingill called the Rove Draw Finisher. This changill can be linked to a fully automated Ringtron ring spinning frame, which can be linked to autom..

SPINNING PROCESSES -- EVOLUTIONS AND PERSPECTIVES.

Ring, rotor, wrap, air jet, and friction spinning are evaluated relative to the technology used in each process. Areas of processing that need improvement are emphasized. The trend in spinning technology is toward increasing specialization of machinery. End product quality remains a major problem especially in ai jet and friction spinning

EFFICIENCY AS A GOAL -- SPINNING TRENDS OF THE YEAR 2000 ACCORDING TO RIETER.

Advances in preparation machinery for spinning are anticipated to reduce costs for yarn producers. Higher levels of automation are expected to be attained along with the full integration of computers and electronic controls. Plants will have to become more capital intensive in order to remain competitive.

TENDENCIES IN YARNS FOR KNITTED GOODS.

Recent fashion trends favor classic rather than novelty yarns, which are being processed for 12 or even 7/8 gauge knits. A new kind of yarn, called third generation yarn, is described. The contributions of rotor, air, friction, and self-twist spinning to the development of new products is reviewed. The ability to change yarn structure and..

SPINNING AUTOMATION.

Recent improvements in spinning automation have occurred at every manufacturing stage: fiber opening, web forming, sliver drawing, combing, and spinning. Spinning frame automation may be linked to a system that integrates the roving frame and the winder. In non-conventional spinning advances in automation have been made in open end, air j..

HOST OF NEW SPINNING SYSTEM IDEAS AT OTEMAS.

New technology displayed at the OTEMAS show in Osaka included the use of electric motors and servomotors in place of belts and gears. Ishikawa exhibited their PSF-TA spinning machine which features anti-node rings for optimum yarn tension control. Kanai Juyo displayed a prototype of a ring spinning machine capable of 35,000 rpm; Toyoda di..