Flax Fibre Fineness and Linear Density Determination Methods
Verify flax linear density using ISO 1973 cut-and-weigh gravimetry at standard 12% regain to accurately forecast wet-spinning limits and enforce contract pricing.
OFDA4000
Fibre Measurement
Optical diameter and fineness analyser 4000 identifies geometric properties of bast fibres within Chinese flax spinning mills. Raw flax material undergoes rigorous testing during the initial preparation stage before carding commences. Chinese mills rely upon OFDA4000 to quantify mean fibre diameter alongside coefficient of variation.
Such measurements determine spinning limits on modern wet spinning frames and predict yarn breaking tenacity. Lower micron values indicate finer parcels suitable for high count shirting yarns whereas coarser lots route towards heavier canvas production. Buyer contracts stipulate strict micron tolerances that independent laboratory certificates must verify prior to financial settlement.
Quality controllers reject shipments exceeding contracted limits because excessive variation compromises draughting performance during drafting and combing operations.
Spinning Standard
Factory acceptance criteria diverge significantly from regional grading rules established by provincial agricultural bureaus. Internal technical departments enforce tighter parameter thresholds to prevent spinning breakages on high speed machinery. OFDA4000 readings generate digital profiles stored within mill databases for lot traceability.
Operators correlate these profiles directly with subsequent yarn irregularity percentages recorded on laboratory testers. Moisture regain levels during testing alter optical absorption characteristics, requiring technicians to condition samples in standardized atmospheric chambers before analysis begins.
Export Specification
Finished yarn packages receive final classification documentation based upon collective physical parameters. Export merchants demand verifiable proof regarding fibre fineness before issuing letters of credit. OFDA4000 output data populates the technical annex attached to international shipping manifests.
European importers evaluate these documentation packages against pre-shipment sealing samples agreed upon during initial contract negotiations. Dispute resolutions regarding handle and drape depend entirely upon objective dimensional data captured at the spinning mill.