SPINNING IN THE 1990s.

The relative advantages and disadvantages of ring, air-jet, rotor, and friction spinning are discussed. Ring spinning was found to be optimal for fiber length strength and yarn count and strength properties. Air-jet spinning is best adapted for medium and long fibers, but not very fine yarn counts. Rotor and friction spinning are best sui..

EXPLORATORY STUDIES ON COMPARISON OF ACRYLIC BASED BULK YARNS MANUFACTURED N DIFFERENT SPINNING SYSTEMS.

Acrylic yarns composed of both shrinkable and non-shrinkable fibers were produced in three different spinning systems--ring, rotor, and SIRO. In all cases, mechanical properties and bulk characteristics were evaluated both before and after heat treatment. The effects of blending at the spinning stage and blending at the blowroom stage wer..

MEASURES FOR POWER CONSUMPTION.

Electrical energy requirements in the spinning mill for carded counts, combed counts, staple fiber counts, doubled yarns, and hank and cone yarns are examined. Methods for assessing a textile mill's power consumption and comparing it with that of other mills are described. Excessive power consumption can result from low motor efficiencies..

CONTROL HAIRINESS OF POLYESTER BLEND YARN THROUGH MAINTENANCE.

Although considerable work has been done on the hairiness of polyester blended yarn, not much work has been done on specific maintenance measures for reducing hairiness to a satisfactory level. These measures include centering spindles at more frequent intervals and with greater precision, application of ring cleaner/lubricant, and regula..

ENERGY CONSERVATION THROUGH PROCESS OPTIMIZATION IN SPINNING.

The economic considerations of increased spindle speeds are evaluated. Energy costs and gains in production are weighed against increased end-breakages and mechanical failures. The search for the most economic speed for a given count of yarn under prevailing mill conditions was undertaken in one of northern India's best mills. Guidelines ..

SCOPE OF COST REDUCTION IN THE PRODUCTION OF SINGLE YARNS THROUGH DOUBLE ROVING FEED (DRF) SYSTEM.

Since the yarn quality produced on the DRF system is much better than that of single yarn, it was thought that it might be possible to spin the equivalent quality single yarn by using inferior mixings or by reducing waste levels during spinning. Yarn quality from high production cards, tandem cards, and tandem carded DRF yarns are compare..

PRODUCTION OF RAISED YARNS IN THE PROCESS OF TWISTING.

The napping effect is achieved by mechanical methods and devices as one specific step in the process of yarn production. Raised yarns may be produced by two methods : yarn is passed between two cylinders, each covered with a layer of needles/teeth ; or between one smooth and one toothed cylinder. The speed of the passing determines the de..

QUALITY ASSURANCE IN YARN PRODUCTION.

Quality assurance in yarn production is ultimately very cost effective because yarn with uniform high quality is sold at a higher price. The cost of raw materials and production is also lowered by using quality assurance data. Uster manufactures a range of sensors, measuring heads, and data systems for on-line quality assurance. Some labo..

JAPANESE TEXTILE MACHINERY IN THE 1990s.

Three Japanese spinning machinery manufacturers with distribution centers in Charlotte, North Carolina, are discussed. The UA33G model, the latest version of Howa's ring spinning machine, is capable of practical spindle speeds to 24,000 revolutions per minute. The machine offers automatic doffing, production monitoring, ends down monitori..

SPINNING IN THE 1990s.

A review of spinning systems emphasizes both the importance of automation to decrease costs and the technical capabilities to produce diverse yarn types. Ring spinning continues to be the most universal system capable of processing most fibers in a very wide yarn count. Advantages and disadvantages of air jet, rotor, and friction spinning..