Predicting Wet Spun Line Tensile Tenacity from Secondary Wall Alignment Data
Secondary wall microfibrillar angle directly limits wet spun line yarn tenacity by setting crystallite load distribution before trough degumming.
Breaking Length
Structural Limit
Tensile strength expressed as the calculated length of a yarn or fibre strand that would break under its own weight when suspended vertically. Laboratory technicians calculate breaking length in kilometres to compare yarn specimens of different linear densities without needing to normalize for cross-sectional thickness variations. The metric applies to spun linen yarns and roving during laboratory physical testing recorded on mill quality certificate logs.
It excludes finished fabric specimens where multidirectional weave forces determine mechanical performance.
Testing Procedure
Standard tensile testing equipment pulls a yarn specimen of known linear density until mechanical failure occurs, recording the breaking force in centinewtons. Dividing this force by the linear density yields tenacity, which converts directly into breaking length when divided by gravitational acceleration. High-count wet-spun flax yarns achieve higher values than dry-spun yarns due to the compact packing of ultimate fibres during wet drafting.
Laboratory testing records log specimen length and breaking force, establishing a baseline for mill quality control documents.
Yarn Grading
Commercial buyers set target thresholds in purchase contracts to guarantee that spun linen withstands high-speed weaving looms without excessive end-breaks. Lower-performing yarns falling below specified limits undergo retesting or reclassification into lower-grade categories suitable for heavier industrial textiles.