Mechanical Extraction
Mechanical separation procedures isolate the ligneous fragments of flax stalks from desirable bast fibres during preliminary preparation stages inside Chinese processing mills. Shive removal operates directly on dried scutched material by applying mechanical action to break woody residues away from flexible strands. Rotary breakers crush residual particles before pneumatic suction draws the loosened debris out of the moving stream.
Raw output enters subsequent carding machines only after passing through high velocity air chambers that separate foreign matter by density.
Acceptance Threshold
Buyer specifications establish strict limits for residual impurities within exported commercial lots of flax fibre. Mill operators assess cleanliness by weighing foreign particulate matter extracted from a standardized sample against total dry mass. Export documentation records this purity metric on official quality certificates accompanying each shipment to foreign spinning facilities.
Contractual agreements penalize batches exceeding acceptable foreign matter limits because residual woody matter damages delicate metal pins on spinning frames.
Processing Protocol
Scutching lines manage dry straw reduction continuously throughout industrial flax preparation before yarn formation begins. Operators adjust mechanical beating intensities according to seasonal variations in raw straw maturity and initial stem rigidity. Cleaned fibre bundles proceed directly to drawing frames where parallel alignment prepares material for subsequent spinning operations.
