Yarn Regularity
Small, localized enlargements in the diameter of a spun yarn occur due to the grouping of shorter flax fibers during the spinning process. While large slubs are considered defects, micro-slub formation is a natural characteristic that gives linen fabric its traditional textured appearance. This parameter is graded by automated yarn scanners that measure the frequency and size of these small thickness variations.
Spinning mills record this distribution in the yarn quality certificate.
Texture Grading
The frequency of these small fiber clusters is influenced by the drafting settings and the raw material grade of the flax. If the draft is uneven, micro-slub formation increases, leading to a more pronounced fabric surface texture. Although buyers appreciate this texture, an excessive number of slubs can reduce yarn strength and cause warp breaks during weaving.
To manage this trade-off, yarn graders use optical sensors to ensure the slubs remain within the permitted limits of the yarn grade. These measurements are included in the quality specifications shared between the spinner and the weaver, serving as a baseline for the yarn’s suitability for high-speed automatic looms.
Fabric Style
Designers utilize this surface texture to create distinct styles in natural linen apparel and home textiles. The slub count per hundred meters is recorded in the fabric’s technical datasheet. This value confirms that the fabric meets the requested cosmetic style.
