Moisture Limitation
Environmental conditions caused by inadequate soil moisture during critical plant growth stages affect the development of flax bast fibres. This physiological condition, known as water deficit stress, limits cell elongation and cell wall thickening in the flax stem, resulting in shorter and coarser fibre bundles. Field agronomists record the soil moisture levels and plant growth rates in the agricultural log to evaluate the impact on the upcoming harvest.
Fibre Quality
Severe exposure to dry soil during the stem elongation period reduces both the yield of long line fibres and the overall tensile strength of the harvested flax. The plants produce thin-walled, brittle fibres that cannot withstand the high tensions of the scutching turbine, resulting in a high percentage of waste tow. This raw material deficiency lowers the spin-grade of the flax bundles, which makes them unsuitable for producing fine, high-count yarns.
Mill Evaluation
Spinning mills test incoming raw flax shipments from dry regions to assess how water deficit stress has altered the fibre’s mechanical properties before blending and combing. The mill compares the fibre strength and fineness results against the buyer’s acceptance criteria to determine if the lot must be blended with stronger fibres or downgraded to coarse-yarn production. These results are recorded on the raw material incoming inspection docket, which lists the fibre’s moisture deficit history as a primary risk factor for drawing-frame performance.
This document is essential for the mill’s raw-material sorting process, allowing it to allocate each batch of flax to the spinning process that best suits its physical limits.
