Dew-Retted Heilongjiang Line Fiber Processing Parameters for Ring Frames
Optimize wet ring frame trough temperatures to 72°C and hold draft ratios below 17 for Heilongjiang dew-retted line flax to limit end breaks.
Dew-Retted Line Fiber
Retting Classification
Moisture exposure during the primary breakdown of pectins defines this method of liberating plant bast from the flax stem. Dew-retted line fiber relies on natural environmental decomposition rather than chemical or water-tank immersion processes to achieve the separation of cellulose bundles. Microorganisms present in the soil digest the pectin adhesives over several weeks of exposure to night humidity and day sunlight.
This chemical digestion dictates the characteristic dark grey or brown coloration of the harvested stock.
Processing Specification
Agricultural output undergoes systematic sorting once field drying reaches the moisture equilibrium required for mechanical breaking. Workers grade this material according to the length of the individual strands and the absence of shive fragments remaining within the bunch. Mills record these attributes in the internal quality control sheet to determine whether the batch meets the requirements for spinning fine yarn or coarser industrial ropes.
Moisture control remains the dominant factor during this stage because high humidity promotes rot while excessive dryness results in brittle material during the subsequent scutching operation.
Export Valuation
International buyers verify the performance of these fibres by assessing the breaking strength and the uniformity of the strand diameter across a sample set. Standardized protocols distinguish this field-processed product from water-retted alternatives through the analysis of the residual mineral content and the structural integrity of the individual filaments. Documentation for shipment includes the moisture content percentage measured at the time of loading to prevent weight gain or spontaneous heating within the container.
Cargo arrives with an explicit declaration of the retting duration as this metric dictates the chemical compatibility of the fibre with specific bleaching agents and reactive dyes used in cloth finishing.