Span Performance
Ultimate breaking force divided by the linear density of a fibre bundle measured at a specific clamp distance of ten millimetres represents the strength of flax over a short span. This value of ten-millimeter tenacity isolates the strength of the fibre substance itself from the weaknesses introduced by long-range surface defects. Quality managers use this measurement to assess the structural integrity of the flax cellulose.
Laboratory Calibration
Testing is conducted using specialized jaw clamps set precisely ten millimetres apart to eliminate the influence of fibre slippage or uneven twisting. This short-gauge method prevents the deformation of the test specimen that would occur over longer test lengths. The resulting data are recorded in centinewtons per tex and are included in the quality certificate provided to the purchasing mill.
Spinning Performance
High values in this short-span test correspond to a lower frequency of yarn breaks during the wet spinning process where the fibres are drafted in a wet state. When the ten-millimeter tenacity of the raw material is high, the spinning frames can run at faster speeds without risking draft zone failures. This efficiency directly reduces the production cost of fine linen yarns and improves the consistency of the finished fabric.
Buyers often specify a minimum value for this short-span tenacity when ordering yarn for high-stress fabric construction where loom stoppages must be minimized.
