Production Method
Industrial yarn manufacturing utilizes high-temperature water baths to soften the pectin binders within roving bundles before drafting. This thermal softening is the basis of flax wet spinning, which yields the fine, smooth yarn required for high-grade linen fabrics. The process allows the individual flax fibres to slide past each other during drafting, producing a highly uniform yarn.
Process Mechanism
Hot water baths maintained at sixty degrees Celsius receive the flax roving immediately before it reaches the drafting rollers. As the roving passes through, the warmth softens the hemicellulose and pectin that bind the technical fibre bundles. This preparation allows the drafting rollers to draw the fibres into a fine yarn of high tenacity.
In contrast, dry spinning techniques produce coarser yarns used for rustic fabrics. Chinese spinning mills document water temperature and drafting speed on the daily spinning log to ensure consistent yarn quality.
Quality Standard
Yarn diameter and hairiness are graded after the spun yarn is wound onto bobbins and dried. Mill-level spinning tests measure the tensile strength of the wet-spun yarn to confirm it meets the buyer’s acceptance criteria. Poorly softened rovings produce yarn with frequent slubs, which triggers immediate downgrading of the fabric lot during weaving.
The mill’s laboratory records the single-end breaking force on the yarn test certificate.
