Gravimetric and Optical Quantification Protocols for Bast Defect Content
Gravimetric digestion provides absolute mass baseline proof for bast defects, while optical scanning provides fast surface area sorting requiring lot calibration.
Scutched Flax Quality
Fibre Assessment
Raw fibre parameters evaluated after mechanical decortication determine the commercial value and processability of long flax strands. Hand grading and laboratory testing evaluate scutched flax quality based on fiber length, tensile strength, cleanliness and flexibility. Chinese spinning mills receive bales accompanied by origin inspection documents that classify long fiber lots into standardized numeric grades.
The evaluation stops applying once raw fiber bundles undergo hackling and wet spinning preparation.
Grading Parameter
Scutching turbine settings directly influence fiber cleanliness by removing woody shives from the retted stem ribbons. Excessive turbine speed damages parallel fiber bundles, reducing long fiber yield and increasing short fiber tow percentages. Inspection teams pull representative fiber samples from each lot to measure bundle tenacity, linear density, fiber fineness and residual shive content using standardized airflow instruments.
Higher grades command premium market prices because clean long fiber yields uniform fine yarn counts with minimal breakage during wet drafting. Mills log incoming lot test values into raw material tracking systems to optimize blending recipes across different fiber shipments.
Spinning Yield
Spinning mills adjust comb settings based on verified raw fiber parameters. High scutched flax quality guarantees lower yarn breakage rates and superior cloth appearance in fine linen weaving.