OPEN END YARNS STILL GOING STRONG.

The growth in open end yarns has allowed spinning manufacturers to operate at a maximum number of production hours. This growth has involved jersey and fleece, polyester and cotton blends, and specialty yarns such as Nomex and Kevlar. The variations in prices for combed versus carded cotton, acrylic, polyester, and cotton and synthetic bl..

SPINNING SYSTEM AND FABRIC QUALITY.

The differences in the quality of fabrics made of polyester/cotton yarns produced on ring, Murata air jet, and open end spinning systems are examined. Pilling, strength, and hand were examined for both woven and knit fabrics. The effects of the spinning system, denier, weave pattern, and tightness of weave were studied.

AUTOMATION IN SPINNING/TEXTURING.

Automation of the production process is becoming essential to the production of synthetic fibers. Integrated control systems allow complete and continuous monitoring of process parameters and product quality. Automated transportation equipment reduces the threat of damage to heavy and expensive packages.

AUTOMATED RING SPINNING MILL.

In October, Rieter introduced its latest innovations for the automated ring-spinning mill. Among its new products were the Robolift, an automated doffer for the roving frame, the Servotrail III, an automated conveying line between the roving frame and the spinning frame, Robofil, for automated patrolling of the spinning frame (including a..

SPINNING-DOUBLING MACHINE EN ROUTE TO AUTOMATION.

Plyfil is a spinning-doubling machine that substantially shortens the length of the route from the drafter sliver to the plied thread. The machine utilizes the model Plycat automatic piecer. This traveling piecer repairs thread breaks and also splices yarn ends if necessary for clearer cuts.

CONVENTIONAL AND NOVEL SHORT STAPLE SPINNING SYSTEMS.

Short staple spinning systems are described for ring, rotor, air jet, friction, and wrap spinning. These systems are compared for basic yarn structure and properties, raw materials, end product applications, economics, and market penetration. The effect of these systems on such yarn properties as strength, evenness, bulk or volume, the nu..

TWISTING MECHANISM OF FREE-END YARN AND YARN TENSION IN FRICTION SPINNING.

A mechanical model is established to describe the free-end yarn during frictional twisting and the factor affecting the twisting torque. The yarn tension is numerically calculated according to formula derived from the test values. The results show that values calculated for yarn tension conform generally to the test data and that the mech..

SPINNING RINGS FOR HIGH SPEEDS.

Eadie Brother's SU ring and traveler combinations is used for spinning polyester, acrylic, cotton, and blended yarns. Compared with conventional rings and travelers, the SU's spinning geometry has undergone a change involving maximum traveler contact area, considerably reduced specific pressure of the traveler against the ring, efficaciou..

AUTOMATION OF A COMPACT SPIN-DRAW MACHINE.

The automation of spinning machines has become more practical. Concerns about computer failures shutting down entire machines and about the inability of service personnel to repair digital systems hampered automation in the past. Now, however, machines are divided into substations to minimize and isolate failures, "Hot Stand-By" or backup..

SPINNING MACHINERY.

The increase in installed ring spindles and open end rotors since 1967 has been accompanied by a growth in short-staple spinning capacity. The numbers of ring spindles and open end rotor spinning machines installed in Asia, Africa, the America's, and the EC in 1987 are illustrated along with the changes in the numbers of ring and rotor sp..