Development Trends in Yarn Preparation

Abstract

After ITMA 03 at Birmingham it is generally accepted that no progress of the operating speed of weaving preparation machinery has been achieved. It encompasses the processes of winding, warping, sizing and drawing-in. Significant novelties have been recorded in the field of operation automation and quality improvement, execution of individual steps, as well as specialization for single types of serial production on a large scale. In the field of winding better results are obtained when winding delicate yarn kinds. Precise yarn laying and tension control are increased, and pattern winding is avoided more successfully and yarn hairiness is reduced. Sectional warping is increasingly automated, a considerable progress is apparent in the field of warping patterned warps and short lengths, where unwinding is carried out from stationary and rotary creels or their combinations. In sizing an improvement of automation and quality with optimizing the wet treatment was demonstrated as a big novelty of the ITMA. In order to economize sizing, sizing by means of rollers was developed. Likewise a machine for sizing single yarns was developed. In drawing-in considerable results were obtained with backwashing machines or distribution into more regular parts in colors as an auxiliary system for automatic drawing-in. Afterwards they operate more precisely and flawlessly. At the same time special machines for thermal treatment of elasthan yarns were designed, whereby their piecing-up is enabled on the existing machines.