Standardized Air Permeability Test Parameters for Raw Flax Bundles
Air permeability fineness tests for raw flax require strict 65 percent RH conditioning, precise chamber packing density, and pre-cleaning of shive debris.
Raw Flax Bundles
Harvest Assembly
Scoured and scutched plant stems arrive at primary textile processing facilities bound in agricultural units. Initial mill operations inspect raw flax bundles to evaluate fibre length, color, cleanliness, and structural alignment before mechanical hackling begins. Unprocessed flax stems collected after field retting and scutching are tied into uniform bundles weighing between five and ten kilograms for transport.
Storage warehouses in flax processing regions monitor internal bundle moisture to prevent mold growth and fibre degradation during storage.
Hackling Preparation
Hackling machines untie raw flax bundles, feeding the parallelized stems into rotating comb pins that separate long line fibres from short tow fragments. Dense or tangled bundles cause pin bending and fibre breakage, reducing long line fibre yield during carding and combing. Quality grading protocols in Chinese mills categorize incoming bundles by fibre strength, shive content percentage, and root end alignment.
Graders untie sample bundles from each shipping lot, performing manual hand-pulling tests to assess fibre cohesion and division degree. Test certificates record bundle mass, moisture content, and yield percentage, establishing baseline parameters for batch processing.
Pricing Basis
Bundle homogeneity influences roving uniformity during subsequent drafting processes in wet spinning mills. Uniform raw flax bundles yield consistent slivers with minimal thick and thin places. Purchase contracts penalize shipments containing irregular bundle weights or high proportions of broken stems.