Development and Experimental Validation of Nonlinear Models for High-Speed Yarn Transport Systems.

Researchers developed computer models for high speed yarn transport systems. Models for ring spinning and twisting predict balloon shape and tension, including the effects of control rings, and reveal process instabilities that might lead to yarn breakage. They also developed similar models for yarn unwinding. Their primary goal is to dev..

Warp frequency - a new parameter for assessing lapping tendency of fibres/spinning system

Roller lapping is an important factor in the performance of spinning and influences stenter efficiency to a great extent. A new method for measuring lapping is proposed. It is independent of the time of observation and the number of spindles observed. It was found that combed yarns exhibited the lowest warp frequency, almost one twentieth..

Spun yarns from micro denier fibre

In this article, the author has discussed the physical properties of micro denier fibre with a view to studying the effect of such properties on the processing parameters for the manufacture of spun yarns from micro denier fibres. The nature of interaction between fibre and machine elements at different stages of spinning is discussed in ..

BCF carpet yarn spinning machines

The new Reiter 10 Flex carpet yarn spinning macines, which enables three-colour yarns to be manufactured for the first time in a single-stage process, is described. Details are provided of the design and operation of the equipment including the production of various yarn types the production speed capability. The advantages of the machine..

Processing of polyester/cotton blends using a new blending method: some observations

Yarns produced from the new sliver lap blending method are stronger (by 5％) when compared with traditionally blended yarns. The variation in strength and also the number of weak places was found to be 40-50％ less for sliver lap blended yarns. The Uster imperfections (frequent yarn faults) were 25-45％ better for sliver lap blended yarns..

Toray develops highly moisture absorbing/releasing nylon

Toray Industries Inc., of Japan has developed Quup nylon filament yarns which exhibit high moisture absorbing and releasing properties, similar to cotton's. A special moisture absorbing/releasing polymer is added to the nylon.

The processing of discontinuous fibre yarns with elastomer

Research by Savio on the twisting of cotton, wool, viscose and other discontinuous fibre yarn with an elastomer is outlined. The elastomer filament is available in two forms, coated and natural. Coated elastomer is fairly expensive, and natural elastomers are preferred. The resulting yarn can be used in knitting and weaving. Its character..

Enzymatic degradation of flax fibres for short fibre spinning (German)(Enzymatischer Feinaufschluss von Flachsfasern fur die Kurzfaserverspinnung)

Scutching tow can be broken down enzymatically for later use in cotton spinning. the purpose of this project was to identify and analyse the degradation products which are formed, in order to interpret the effects of the eznyme complexes examined. The liquors were examined with the aid of HPLC, photometry and titration. On the basis of th..

Innovative ceramics for high performance spinning

The use of high performance ceramics (also known as fine ceramics, advanced certamics of technical ceramics) in the production of yarns is reviewed. These materials, which are made of fully synthetic materials, are used in the production of a range of components including ring/traveller systems, yarn guides, friction disks for false twist..

Studies on mechanical conditioning of P/V ring yarn

This article describes the mechanical conditioning of polyester/viscose rayon (p/v) ring spun yarn. It investigates the effect of different parameters of mechanical conditioning on yarn properties using Box and Behnken response surface design. It also uses a second order response surface design to ascertain the most favourable conditions ..