Modeling Elementary Cross Sectional Variances to Predict Wet Spinning Breakage
Modeling elementary fiber cross-sectional variance predicts wet spinning end breaks by identifying localized cell wall stress concentrations under drafting tension.
ISO 2370 Linear Density
Global Method
International testing standards establish a uniform approach for determining the mass per unit length of flax fibers. The protocol defined in ISO 2370 linear density measures the weight of a specific length of parallelized flax fibers under controlled moisture and tension conditions. This procedure applies to both long line flax and short tow fibers before spinning occurs.
It provides a standardized baseline that allows trading partners in different countries to verify the fineness of raw materials.
Laboratory Process
Specialized technicians prepare a parallel bundle of fibers using a comb and cut it to a precise length of thirty millimeters. These fibers are then weighed on a high precision microbalance to calculate the decitex value of the sample. To ensure accuracy, the samples must spend twenty four hours in a climate room at a relative humidity of sixty five percent.
This step prevents moisture absorption from skewing the weight calculation. If the test reveals high density variation within a single bale, the mill can reclassify the batch for coarser applications.
Commercial Consequence
Mills utilize these values to determine the yarn count that can be spun from a given lot. Higher decitex values indicate coarser fibers that cannot be spun into fine yarns. Shipments that do not match the requested ISO 2370 linear density can be rejected by the spinning factory or subjected to price adjustments.
This measurement forms the foundation of quality assurance in modern fiber processing.