Development of a constitutive theory for short fibre yarns. III. Effects of fibre orientation and bending deformation

This article deals with the effects of fibre orientation and bending deformation on staple yarn behaviour. First, the effect of fibre orientation is shown by comparing yarn properties determined using three different fibre orientation cases. Then, for a given fibre orientation distribution, radial distributions of both tensile stress and ..

Development of a constitutive theory for short fibre yarns. II. Mechanics of staple yarn with slippage effect

A general constitutive theory governing the mechanical behaviour of staple yarns and including the effect of fibre slippage during yarn extension is presented. A differential equation describing the stress transfer mechanism as well as the slippage influence in a staple yarn is applied by which both the distributions of fibre tension and ..

Method for evaluating fibre distribution in a yarn

A mathematical analysis is made of the fibre distribution in an Nm 14 70/30 cellulosic/polyester yarn, the polyester fibres move mainly to the interior of the yarn, giving it the appropriate physical and mechanical properties. The cellulosic fibres move mainly to the outside, giving it good comfort properties and abrasion resistance.

A study on the performance characteristics of spun yarns

The strength and elastic recovery characteristics of ring-spun and rotor open-end-spun cotton, polyester, polyester/viscose rayon and cotton/polyester are examined at different strain levels. The cotton ring-spun and rotor-spun yarns can be strained up to 2％ extension without causing any permanent deformation to their structure, whereas ..

Colana Cotton/Wool Blends for Home and Export.

Rocklea Spinning Mills' Colana yarn is a 70/30 combed cotton/wool blend that is fine and light and has superior hand and performance. It combines the comfort and easy care of cotton with the the warmth and resilience of wool. As a result, the yarn is trans-seasonal. It is available in various counts. Most importantly, Colana is Australia'..

Damping the Tension Impulse in the Thread on a Frictional Barrier.

Researchers at the Technical University of Lodz (Poland) derived differential equations of motion that described tension impulse transmission from a yarn through a tricitional barrier with a circular cross section. The differential equations, which were related to the Newtonian equations of motion, assumed that the behavior of the yarn ob..

Strength or Toughness.

Toughness is defined as the ability of a material to endure large deformations without rupture. A cotton yarn spinning company recently encountered difficulty achieving the rotor speed at which its machines were rated. Tests by the Institute of Textile Te

The Role of Yarn Surface Geometry in the Engineering of Textle Materials.

Researchers investigated the influence of hairiness on such yarn properties as linear density and primary and secondary twist level. Experiments also assessed the effects of the type of fiber as well as the spinning technology employed. The acientists man

Some Experiments on Textured Yarn Snarling.

A study examined snarling in textured multifilament yarns during the various stages of manufacture. Researchers simulated different combinations of torque and twist to study the torque balance of the yarns. The amount of snarling twist decreased when the

Barre and the Influences of Yarn Manufacturing.

To optimize blending and avoid micronaire variation, analysts recommend that manufacturers know the properties of each cotton bale selected, seek a less than 0.2 difference in micronaire average between laydowns, use multi-cell mixers and blending machines, and develop a set procedure for blending. Avoiding yarn count variation will help ..