Calibrating Optical Image Analysis for Overlapping Technical Flax Fiber Bundles
Optical image analysis of overlapping flax bundles demands controlled sample dispersion, distance transform segmentation, and microtome cross-sectional correction.
D50 Mean Width
Fiber Fineness
The median value of the fiber bundle width distribution determines the average fineness of combed flax. This D50 mean width tells the spinning mill whether the flax has been sufficiently split during the hackling stage. A lower median width corresponds directly to a finer fiber population, which is essential for spinning high-count yarns.
A higher value indicates that the flax bundles remain relatively thick.
Process Control
Measurement of the fiber bundles occurs via automated image analysis of samples taken from the hackling lines. The D50 mean width is logged by quality control technicians to evaluate the efficiency of the retting and hackling processes. If the median width exceeds the target for a specific yarn count, the mill must increase the hackling intensity or adjust the pin density of the combs.
Maintaining a stable median width is critical for ensuring consistent yarn counts across different production lots.
Product Quality
The yarn spun from flax with a low D50 mean width is smoother and more uniform, which is highly prized for premium linen garments. Fabric produced from such yarn has fewer knots and a more even texture. It is the primary metric that buyers look at when sourcing high-quality combed flax.