Strand Reduction
The mechanical reduction of a fiber strand’s cross-sectional thickness represents a fundamental stage in yarn spinning. Through the application of drafting attenuation, dense roves of flax are converted into fine, even ribbons suitable for twisting into strong yarns. This action separates the nested fibers and slides them past one another along their longitudinal axes.
The process must be tightly controlled to avoid creating thin spots or breaks in the draft zone.
Roller Mechanism
Consecutive pairs of rollers running at progressive surface speeds execute the physical pull required to thin the strand. The distance between these nip points is adjusted based on the average length of the flax fibers being processed. If the draft zone is too wide, uncontrolled fiber movement occurs, whereas a zone that is too narrow results in fiber breakage.
This mechanical action achieves drafting attenuation by ensuring that the delivery rollers turn much faster than the feed rollers, drawing the material out to its target density.
Slub Control
Fiber alignment determines the final uniformity and strength of the spun linen. Inconsistent drafting attenuation introduces unwanted thick and thin sections, leading to structural weak points in the woven fabric. Minimizing these defects requires precise alignment and constant tension throughout the drawing frame.
