Standard Classification Mechanics for Raw Dew Retted Flax Straw
Classification of raw dew retted flax straw relies on stalk morphology, moisture limits, and chemical pectin degradation to predict mechanical scutching yields.
Fungal Saprophytic Retting
Microbial Degradation
Biological stem decomposition represents the primary method of separating usable bast fibres from the woody core of the flax plant. The process of fungal saprophytic retting relies on specific molds to colonize the damp straw and consume the pectins that bind the fibres. This natural method occurs on the field under specific moisture conditions, where the fungi gradually break down the cellular cement.
Such activity requires careful monitoring to prevent the fungi from attacking the cellulose itself.
Quality Impact
Over-retting weakens the structural integrity of the flax fibres, reducing the yield of high-grade line fibre. When fungal saprophytic retting proceeds too far, the fungi degrade the outer cell walls, which leads to high wastage during the scutching phase. The technician documents the fiber degradation level on the batch reception docket.
Process Control
Environmental conditions like temperature and rainfall dictate the speed of the fungal action. In dry seasons, the progress of fungal saprophytic retting slows down, requiring the farmer to turn the straw regularly to ensure even colonization. The mill’s procurement team relies on moisture sensors to decide the optimal time for lifting the straw from the ground and baling it.
This careful management ensures a balanced ratio of long line fibres to short tow, protecting the textile grade of the final woven fabric.