Tensile Parameter
Mechanical resistance to axial strain defines the ultimate force that long plant bundles sustain prior to structural rupture in yarn processing. Standardized laboratory procedures evaluate bast fibre tenacity in centinewtons per tex using conditioned fiber bundles. High values indicate thick cell walls capable of enduring high mechanical tension.
This measurement establishes the boundary for drafting speed during wet spinning operations.
Mechanical Response
Bundles undergo progressive division during hackling and drafting, where pectin matrices between individual cells yield under mechanical stress. When roving enters the hot water bath before ring spinning, thermal softening of pectin alters load distribution along the strand. Lower levels of bast fibre tenacity cause premature strand breakdown in the drafting zone, producing frequent end breaks and irregular yarn count.
Higher values allow fine yarn spinning at elevated speeds without compromising strand continuity. Mill technicians monitor bundle strength during raw material receiving to set drafting roller distances and twist multipliers on spinning frames.
Commercial Guarantee
Purchase agreements between European scutchers and Asian spinning mills specify minimum strength values measured on bundle testing instruments. Receiving protocols require multiple test repetitions per bale lot to establish compliance before warehouse blending. Deficiencies below contract limits trigger commercial discounts or lot rejections.
