Different opinions and relative analysis methods on the effects of false twist,twist deterrent or twist fault of the navel are described.

Describes the working principle of single-stage double-twisting frame, an integration of twisting, false twisting and setting, and the effects of technical parameters such as false twist level,double-twist level, heating temperature, heating/cooling duration and tension on the quality of polyester textured crepe silk.

ne-process two-for-one twister incorporating double twisting, setting and false twisting on one machine provides a new system for the production of silk-like crepe.

Analysis of the research status of effects of the navel in rotor spinning;

To get wool30/acrylic70 rotor spun yarn with better properties,elements of rotor spinning machine(opening roll,navel) are chosen and the processing parameters(speed of rotor,speed of opening roll and twist multiplier) are optimized.

Blending spinnning test of spun silk and cashmere with the opening roller and the navel of variety of specifications is done on the rotor spinning frame.

For micro denier porous PET DTY, a big problem is bad unwinding performance when it weaves at high speed.

It introduced the production process of wool-like polyester filament which was developed and produced on 33H false-twist texturing machine,made in Japan TMT copmany,using different shrinkage blend fiber technology,with the fine denier perforated polyester POY and FDY as the raw material.

The TD jet series by Enka tecnica GmbH, Heinsberg/Germany, is the latest development for the manufacing of draw-textured yarns(DTY) using the false-twist texturing process.