Limit Resistance
Evaluation of fibre bundles or single strands with no gap between the clamping jaws isolates the maximum potential strength of the raw cellulosic material. This procedure, known as zero-gauge testing, eliminates the effect of surface defects that are typically distributed along the length of the fibre. Spinning mills use the resulting values to understand the absolute limit of the flax’s mechanical performance.
Gauge Configuration
Flat jaws are brought into direct contact before being tightened on the parallel ribbon of flax fibres to ensure there is no free span between them. This alignment prevents any strand deformation from occurring outside the immediate shear plane during the pull. Technicians record the resulting force on the laboratory data sheet as the ultimate bundle breaking tension.
Process Utility
Comparing these results with measurements from longer test spans helps the combed yarn producer identify the frequency of structural flaws in the flax crop. When the discrepancy between zero-gauge testing results and standard-gauge results is small, the flax is highly uniform and will produce a superior yarn. This knowledge enables the mill to adjust the wet drafting temperature and the spin speed to match the true physical capacity of the flax harvest.
Such adjustments protect the fabric mill from tension drops that cause irregular yarn distribution and uneven interlacing structures in the finished linen cloth.
