Drawing and setting

Synthetic yarns and threads usually need to be drawn and set in order to achieve the desired level of shrinkage and stretch properties. This process plays an important role in the quality of sewing threads and embroidery threads, especially in terms of sewing performance and appearance. During drawing, the thread is pulled under tension and rewound, resulting in drawing and stretch adjustment. This reduces the existing stretch of the thread. Depending on the type of sewing thread and embroidery thread, the drawing and fixing process is carried out at different positions within the process chain and using different methods.

Core spun and spun threads are wound under tension onto so-called drawing spools, which are then fixed in an oven on a setting cart. The effect of hot air at high setting temperatures permanently stabilises the drawing and thus the reduction in elongation achieved. Sewing threads treated in this way retain their stretch and shrinkage properties up to this temperature range during subsequent use.

Sewing threads made of continuous filament material are drawn by pairs of fast-running cylinders, one of which is heated. The use of the ring tube facilitates the drawing process. The ratio of the different cylinder speeds determines the degree of drawing. Continuous filament yarns are not usually thermally set afterwards.