Verifying Raw Flax Traceability from Field to Scutcher
Verify raw flax origin by matching field cadastral logs to weighbridge moisture tickets, scope certificates, and scutching mass balance yield ratios.
Arrachage
Harvesting Method
Agricultural uprooting represents the standard procedure for gathering flax plants to preserve the full length of the cortical sclerenchyma. This mechanical or manual extraction, known as arrachage, occurs when the lower stem turns yellow and the seed capsules begin to brown. The process ensures that the valuable spinnable fibres extending into the root are not severed by mower blades.
By extracting the entire stalk, operators prevent the entry of ground moisture that can cause localized rot during subsequent field retting. When the root is pulled intact, the biological structures of the fibre bundles remain shielded from premature fungal decay while lying in the field.
Fiber Preservation
Retting field layouts must align with the direction of the pulled stalks to allow uniform dew exposure across the straw. Industrial mills in China monitor the duration of this field stage through batch certificates issued by European suppliers. The arrachage stage determines whether the straw remains straight, which prevents tangling during the subsequent scutching process.
Uniformly laid straw facilitates the mechanical separation of long line fibres from the woody shives.
Grade Impact
Acceptance criteria at the spinning mill depend heavily on the harvesting quality. If the pulling was uneven, the scutching yields drop, which reduces the volume of long linen fibres available for fine yarn spinning. Workers assess the flax consignments against moisture levels and stem length consistency.
Poor harvesting results in high scutching loss and a higher proportion of short tow fibres.