Internal Structure
The central cavity running along the longitudinal axis of a flax fiber determines the internal volume and moisture absorption capacity of the material. Variations in bast fibre lumen morphology affect the flexibility of individual fibers during spinning. A narrow lumen results in a stiffer cell wall.
This structural rigidity alters the tactile quality of the yarn.
Absorption Profile
Liquid absorption during the scouring and bleaching phases depends heavily on the capillary action of these internal cavities. When the bast fibre lumen morphology exhibits a wide or irregular opening, dyes migrate more rapidly through the core of the fiber. This fast migration promotes uniform color distribution across the woven fabric.
Conversely, a restricted cavity limits dye penetration, which sometimes yields a patchy appearance in the finished cloth.
Microscopic Verification
Laboratory technicians evaluate cross-sectional samples of yarn during the raw material intake phase using high-magnification optical instruments. They document their observations in the fiber structure report, which becomes part of the buyer’s acceptance file. By measuring the ratio of the lumen area to the total cell wall area, the laboratory assesses the maturity of the flax crop.
If the bast fibre lumen morphology reveals immature fibers with oversized cavities, the mill adjusts the bleaching duration to prevent fiber degradation. This measurement provides the basis for optimizing wet processing parameters before bulk production starts.
