The Torsional Behavior of Singles Yarns. Part II: Evaluation

Research on the torsional behavior of singles yarns focused on the experimental evaluation of a theory developed for two different cases of yarn torsion. The research compared predicitions of torque-twist relationships based on this theory with data collected on woolen spun carpet yarns processed at varying twist levels. Typical theoretic..

The Torsional Behavior of Singles Yarns. Part I: Theory

Research on the torsional behavior of singles yarns used the conventional method that predicts the tensile behavior of bulky singles yarns at small extensions (less than 10 percent) to model torsion. Discrete fiber modeling principles, an energy method, and a shortest path hypothesis formed the basis of the theoretical analysis. The poten..

Studies on High Tenacity Viscose Spinning.

Researchers at BTRA developed nondestructive tests to determine hole profile diameters in spinnerets. The method also helped determine the causes of filament breaks during viscose fiber extrusion. The profiling procedure involved taking polymer impressions of the spinnerets. After immersion in a silicon oil, the technician immersed the sp..

Spinneret--An Important Quality and Productivity Parameter in Melt Spinning.

A review of spinneret designs for melt extrusion systems focuses on plate sizes, raw materials, bore hole shapes, and future trends for increased performance. During typical extrusion operations, spinnerets accommodate temperatures that range from 200 to 400 degres centigrade and mechanical pressure loads that range from 30 to 400 bars. C..

Spinnerets for Melt Spinning.

The design of flat spinneret plates for melt extrusion must accommodate operating temperatures that range from 200 to 400 degrees centigrade and mechanical pressure loads that range from 30 to 400 bars. Most spinneret plates are made from corrosion resistant stainless steel. Analysis shows that spinnerets should not have more than ten row..

New instrument for measuring abrasion, lint and weak spots in cotton spun yarns

Features of the CTT-BU testing instrument from Lawson-Hemphill for determining abrasion, lint and weak spots in cotton spun yarn, in particular cotton rotor open-end-spun yarns, are described.

The use of effective fineness to determine the effect of wool-fibre-diameter distribution on yarn properties

For fine yarns, ie those with on average∼35 fibres in the crosssection, wool-fibre-diameter distribution is shown to affect spinning performance as well as yarn evenness and tensile properties. This is demonstrated by using effective flneness, a parameter derived from yarn-evenness theory, which is a better predictor of (fine) physical y..

A contribution to the technology of greases. Ⅶ

This article represents the 7th part of a book devoted to the subject of greases used to facilitate the spinning process. The article deals with the determination of the viscosity of the greases and describes the operation of the Engler viscosimeter, the Saybolt viscosimeter and the Ford cup. Kinematic and dynamic viscosity, the equivalen..

Blend fibre yarn

The claim refers to a method for producing a blended wool/man-made fibre yarn. The wool fibres are given a shrink-resistant finish and then combined with a cellulosic fibre. A softening resin may be applied to the wool before or after blending. Blends of cotton or flax with man-made fibres are also disclosed. IPC D02G.

Fabric Testing

The most important trends in fabric testing include automation and the increased prevalence of online fabric inspection equipment. Recent environmental legislation and ecolabeling initiatives are expanding the range of fabric tests. To comply with strict environmental standards, new test must go beyond the traditional measurement of physi..