Standard Moisture Regain Equations for Raw Flax Weight Settlement
Standard moisture regain formulas adjust raw flax invoice mass by converting weighed tonnage into bone-dry weight plus contractual water allowances.
Raw Flax
Harvest State
Agricultural processing of the Linum usitatissimum plant begins with harvesting and retting to loosen the fiber bundles from the wooden stem. In this state, raw flax consists of the unrefined straw that contains both the usable bast fibers and the unusable woody core called shive. The harvested material is stored in bales before being sent to the scutching mill for fiber extraction.
This material acts as the primary input for the entire linen supply chain, and its quality is highly dependent on weather conditions and soil quality during the growing season. Spinners must monitor these agricultural variables to anticipate the spinning performance of the incoming fiber.
Extraction Process
Mechanical separation processes are required to isolate the spinning-grade fibers from the straw. The bales of raw flax are passed through crushing rollers and scutching wheels to beat away the woody shive and extract the long line fiber. This mechanical action is recorded in the mill’s yield logs, which compare the weight of the starting straw against the weight of the recovered fibers.
The efficiency of this extraction determines the commercial value of the crop.
Quality Evaluation
Grading at this stage is based on the success of the retting process. Over-retted straw produces weak fibers, while under-retted material is difficult to clean and spin. Technicians assess fiber strength and color to determine the appropriate end-use.
This classification decides whether the fiber is routed to fine yarn spinning or coarse rope making.